forked from KolibriOS/kolibrios
5556 lines
187 KiB
C
5556 lines
187 KiB
C
// Ogg Vorbis audio decoder - v1.19 - public domain
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// http://nothings.org/stb_vorbis/
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//
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// Original version written by Sean Barrett in 2007.
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//
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// Originally sponsored by RAD Game Tools. Seeking implementation
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// sponsored by Phillip Bennefall, Marc Andersen, Aaron Baker,
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// Elias Software, Aras Pranckevicius, and Sean Barrett.
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//
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// LICENSE
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//
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// See end of file for license information.
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//
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// Limitations:
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//
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// - floor 0 not supported (used in old ogg vorbis files pre-2004)
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// - lossless sample-truncation at beginning ignored
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// - cannot concatenate multiple vorbis streams
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// - sample positions are 32-bit, limiting seekable 192Khz
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// files to around 6 hours (Ogg supports 64-bit)
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//
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// Feature contributors:
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// Dougall Johnson (sample-exact seeking)
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//
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// Bugfix/warning contributors:
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// Terje Mathisen Niklas Frykholm Andy Hill
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// Casey Muratori John Bolton Gargaj
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// Laurent Gomila Marc LeBlanc Ronny Chevalier
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// Bernhard Wodo Evan Balster github:alxprd
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// Tom Beaumont Ingo Leitgeb Nicolas Guillemot
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// Phillip Bennefall Rohit Thiago Goulart
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// github:manxorist saga musix github:infatum
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// Timur Gagiev Maxwell Koo Peter Waller
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// github:audinowho Dougall Johnson
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//
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// Partial history:
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// 1.19 - 2020-02-05 - warnings
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// 1.18 - 2020-02-02 - fix seek bugs; parse header comments; misc warnings etc.
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// 1.17 - 2019-07-08 - fix CVE-2019-13217..CVE-2019-13223 (by ForAllSecure)
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// 1.16 - 2019-03-04 - fix warnings
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// 1.15 - 2019-02-07 - explicit failure if Ogg Skeleton data is found
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// 1.14 - 2018-02-11 - delete bogus dealloca usage
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// 1.13 - 2018-01-29 - fix truncation of last frame (hopefully)
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// 1.12 - 2017-11-21 - limit residue begin/end to blocksize/2 to avoid large temp allocs in bad/corrupt files
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// 1.11 - 2017-07-23 - fix MinGW compilation
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// 1.10 - 2017-03-03 - more robust seeking; fix negative ilog(); clear error in open_memory
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// 1.09 - 2016-04-04 - back out 'truncation of last frame' fix from previous version
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// 1.08 - 2016-04-02 - warnings; setup memory leaks; truncation of last frame
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// 1.07 - 2015-01-16 - fixes for crashes on invalid files; warning fixes; const
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// 1.06 - 2015-08-31 - full, correct support for seeking API (Dougall Johnson)
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// some crash fixes when out of memory or with corrupt files
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// fix some inappropriately signed shifts
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// 1.05 - 2015-04-19 - don't define __forceinline if it's redundant
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// 1.04 - 2014-08-27 - fix missing const-correct case in API
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// 1.03 - 2014-08-07 - warning fixes
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// 1.02 - 2014-07-09 - declare qsort comparison as explicitly _cdecl in Windows
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// 1.01 - 2014-06-18 - fix stb_vorbis_get_samples_float (interleaved was correct)
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// 1.0 - 2014-05-26 - fix memory leaks; fix warnings; fix bugs in >2-channel;
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// (API change) report sample rate for decode-full-file funcs
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//
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// See end of file for full version history.
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//////////////////////////////////////////////////////////////////////////////
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//
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// HEADER BEGINS HERE
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//
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#ifndef STB_VORBIS_INCLUDE_STB_VORBIS_H
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#define STB_VORBIS_INCLUDE_STB_VORBIS_H
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#if defined(STB_VORBIS_NO_CRT) && !defined(STB_VORBIS_NO_STDIO)
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#define STB_VORBIS_NO_STDIO 1
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#endif
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#ifndef STB_VORBIS_NO_STDIO
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#include <stdio.h>
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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/////////// THREAD SAFETY
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// Individual stb_vorbis* handles are not thread-safe; you cannot decode from
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// them from multiple threads at the same time. However, you can have multiple
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// stb_vorbis* handles and decode from them independently in multiple thrads.
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/////////// MEMORY ALLOCATION
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// normally stb_vorbis uses malloc() to allocate memory at startup,
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// and alloca() to allocate temporary memory during a frame on the
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// stack. (Memory consumption will depend on the amount of setup
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// data in the file and how you set the compile flags for speed
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// vs. size. In my test files the maximal-size usage is ~150KB.)
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//
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// You can modify the wrapper functions in the source (setup_malloc,
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// setup_temp_malloc, temp_malloc) to change this behavior, or you
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// can use a simpler allocation model: you pass in a buffer from
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// which stb_vorbis will allocate _all_ its memory (including the
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// temp memory). "open" may fail with a VORBIS_outofmem if you
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// do not pass in enough data; there is no way to determine how
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// much you do need except to succeed (at which point you can
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// query get_info to find the exact amount required. yes I know
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// this is lame).
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//
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// If you pass in a non-NULL buffer of the type below, allocation
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// will occur from it as described above. Otherwise just pass NULL
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// to use malloc()/alloca()
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typedef struct
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{
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char *alloc_buffer;
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int alloc_buffer_length_in_bytes;
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} stb_vorbis_alloc;
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/////////// FUNCTIONS USEABLE WITH ALL INPUT MODES
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typedef struct stb_vorbis stb_vorbis;
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typedef struct
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{
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unsigned int sample_rate;
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int channels;
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unsigned int setup_memory_required;
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unsigned int setup_temp_memory_required;
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unsigned int temp_memory_required;
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int max_frame_size;
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} stb_vorbis_info;
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typedef struct
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{
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char *vendor;
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int comment_list_length;
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char **comment_list;
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} stb_vorbis_comment;
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// get general information about the file
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extern stb_vorbis_info stb_vorbis_get_info(stb_vorbis *f);
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// get ogg comments
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extern stb_vorbis_comment stb_vorbis_get_comment(stb_vorbis *f);
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// get the last error detected (clears it, too)
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extern int stb_vorbis_get_error(stb_vorbis *f);
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// close an ogg vorbis file and free all memory in use
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extern void stb_vorbis_close(stb_vorbis *f);
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// this function returns the offset (in samples) from the beginning of the
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// file that will be returned by the next decode, if it is known, or -1
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// otherwise. after a flush_pushdata() call, this may take a while before
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// it becomes valid again.
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// NOT WORKING YET after a seek with PULLDATA API
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extern int stb_vorbis_get_sample_offset(stb_vorbis *f);
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// returns the current seek point within the file, or offset from the beginning
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// of the memory buffer. In pushdata mode it returns 0.
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extern unsigned int stb_vorbis_get_file_offset(stb_vorbis *f);
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/////////// PUSHDATA API
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#ifndef STB_VORBIS_NO_PUSHDATA_API
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// this API allows you to get blocks of data from any source and hand
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// them to stb_vorbis. you have to buffer them; stb_vorbis will tell
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// you how much it used, and you have to give it the rest next time;
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// and stb_vorbis may not have enough data to work with and you will
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// need to give it the same data again PLUS more. Note that the Vorbis
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// specification does not bound the size of an individual frame.
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extern stb_vorbis *stb_vorbis_open_pushdata(
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const unsigned char * datablock, int datablock_length_in_bytes,
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int *datablock_memory_consumed_in_bytes,
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int *error,
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const stb_vorbis_alloc *alloc_buffer);
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// create a vorbis decoder by passing in the initial data block containing
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// the ogg&vorbis headers (you don't need to do parse them, just provide
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// the first N bytes of the file--you're told if it's not enough, see below)
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// on success, returns an stb_vorbis *, does not set error, returns the amount of
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// data parsed/consumed on this call in *datablock_memory_consumed_in_bytes;
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// on failure, returns NULL on error and sets *error, does not change *datablock_memory_consumed
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// if returns NULL and *error is VORBIS_need_more_data, then the input block was
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// incomplete and you need to pass in a larger block from the start of the file
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extern int stb_vorbis_decode_frame_pushdata(
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stb_vorbis *f,
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const unsigned char *datablock, int datablock_length_in_bytes,
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int *channels, // place to write number of float * buffers
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float ***output, // place to write float ** array of float * buffers
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int *samples // place to write number of output samples
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);
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// decode a frame of audio sample data if possible from the passed-in data block
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//
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// return value: number of bytes we used from datablock
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//
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// possible cases:
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// 0 bytes used, 0 samples output (need more data)
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// N bytes used, 0 samples output (resynching the stream, keep going)
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// N bytes used, M samples output (one frame of data)
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// note that after opening a file, you will ALWAYS get one N-bytes,0-sample
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// frame, because Vorbis always "discards" the first frame.
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//
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// Note that on resynch, stb_vorbis will rarely consume all of the buffer,
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// instead only datablock_length_in_bytes-3 or less. This is because it wants
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// to avoid missing parts of a page header if they cross a datablock boundary,
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// without writing state-machiney code to record a partial detection.
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//
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// The number of channels returned are stored in *channels (which can be
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// NULL--it is always the same as the number of channels reported by
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// get_info). *output will contain an array of float* buffers, one per
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// channel. In other words, (*output)[0][0] contains the first sample from
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// the first channel, and (*output)[1][0] contains the first sample from
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// the second channel.
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extern void stb_vorbis_flush_pushdata(stb_vorbis *f);
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// inform stb_vorbis that your next datablock will not be contiguous with
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// previous ones (e.g. you've seeked in the data); future attempts to decode
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// frames will cause stb_vorbis to resynchronize (as noted above), and
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// once it sees a valid Ogg page (typically 4-8KB, as large as 64KB), it
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// will begin decoding the _next_ frame.
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//
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// if you want to seek using pushdata, you need to seek in your file, then
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// call stb_vorbis_flush_pushdata(), then start calling decoding, then once
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// decoding is returning you data, call stb_vorbis_get_sample_offset, and
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// if you don't like the result, seek your file again and repeat.
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#endif
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////////// PULLING INPUT API
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#ifndef STB_VORBIS_NO_PULLDATA_API
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// This API assumes stb_vorbis is allowed to pull data from a source--
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// either a block of memory containing the _entire_ vorbis stream, or a
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// FILE * that you or it create, or possibly some other reading mechanism
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// if you go modify the source to replace the FILE * case with some kind
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// of callback to your code. (But if you don't support seeking, you may
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// just want to go ahead and use pushdata.)
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#if !defined(STB_VORBIS_NO_STDIO) && !defined(STB_VORBIS_NO_INTEGER_CONVERSION)
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extern int stb_vorbis_decode_filename(const char *filename, int *channels, int *sample_rate, short **output);
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#endif
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#if !defined(STB_VORBIS_NO_INTEGER_CONVERSION)
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extern int stb_vorbis_decode_memory(const unsigned char *mem, int len, int *channels, int *sample_rate, short **output);
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#endif
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// decode an entire file and output the data interleaved into a malloc()ed
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// buffer stored in *output. The return value is the number of samples
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// decoded, or -1 if the file could not be opened or was not an ogg vorbis file.
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// When you're done with it, just free() the pointer returned in *output.
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extern stb_vorbis * stb_vorbis_open_memory(const unsigned char *data, int len,
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int *error, const stb_vorbis_alloc *alloc_buffer);
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// create an ogg vorbis decoder from an ogg vorbis stream in memory (note
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// this must be the entire stream!). on failure, returns NULL and sets *error
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#ifndef STB_VORBIS_NO_STDIO
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extern stb_vorbis * stb_vorbis_open_filename(const char *filename,
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int *error, const stb_vorbis_alloc *alloc_buffer);
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// create an ogg vorbis decoder from a filename via fopen(). on failure,
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// returns NULL and sets *error (possibly to VORBIS_file_open_failure).
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extern stb_vorbis * stb_vorbis_open_file(FILE *f, int close_handle_on_close,
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int *error, const stb_vorbis_alloc *alloc_buffer);
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// create an ogg vorbis decoder from an open FILE *, looking for a stream at
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// the _current_ seek point (ftell). on failure, returns NULL and sets *error.
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// note that stb_vorbis must "own" this stream; if you seek it in between
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// calls to stb_vorbis, it will become confused. Moreover, if you attempt to
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// perform stb_vorbis_seek_*() operations on this file, it will assume it
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// owns the _entire_ rest of the file after the start point. Use the next
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// function, stb_vorbis_open_file_section(), to limit it.
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extern stb_vorbis * stb_vorbis_open_file_section(FILE *f, int close_handle_on_close,
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int *error, const stb_vorbis_alloc *alloc_buffer, unsigned int len);
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// create an ogg vorbis decoder from an open FILE *, looking for a stream at
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// the _current_ seek point (ftell); the stream will be of length 'len' bytes.
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// on failure, returns NULL and sets *error. note that stb_vorbis must "own"
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// this stream; if you seek it in between calls to stb_vorbis, it will become
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// confused.
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#endif
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extern int stb_vorbis_seek_frame(stb_vorbis *f, unsigned int sample_number);
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extern int stb_vorbis_seek(stb_vorbis *f, unsigned int sample_number);
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// these functions seek in the Vorbis file to (approximately) 'sample_number'.
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// after calling seek_frame(), the next call to get_frame_*() will include
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// the specified sample. after calling stb_vorbis_seek(), the next call to
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// stb_vorbis_get_samples_* will start with the specified sample. If you
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// do not need to seek to EXACTLY the target sample when using get_samples_*,
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// you can also use seek_frame().
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extern int stb_vorbis_seek_start(stb_vorbis *f);
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// this function is equivalent to stb_vorbis_seek(f,0)
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extern unsigned int stb_vorbis_stream_length_in_samples(stb_vorbis *f);
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extern float stb_vorbis_stream_length_in_seconds(stb_vorbis *f);
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// these functions return the total length of the vorbis stream
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extern int stb_vorbis_get_frame_float(stb_vorbis *f, int *channels, float ***output);
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// decode the next frame and return the number of samples. the number of
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// channels returned are stored in *channels (which can be NULL--it is always
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// the same as the number of channels reported by get_info). *output will
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// contain an array of float* buffers, one per channel. These outputs will
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// be overwritten on the next call to stb_vorbis_get_frame_*.
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//
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// You generally should not intermix calls to stb_vorbis_get_frame_*()
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// and stb_vorbis_get_samples_*(), since the latter calls the former.
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#ifndef STB_VORBIS_NO_INTEGER_CONVERSION
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extern int stb_vorbis_get_frame_short_interleaved(stb_vorbis *f, int num_c, short *buffer, int num_shorts);
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extern int stb_vorbis_get_frame_short (stb_vorbis *f, int num_c, short **buffer, int num_samples);
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#endif
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// decode the next frame and return the number of *samples* per channel.
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// Note that for interleaved data, you pass in the number of shorts (the
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// size of your array), but the return value is the number of samples per
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// channel, not the total number of samples.
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//
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// The data is coerced to the number of channels you request according to the
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// channel coercion rules (see below). You must pass in the size of your
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// buffer(s) so that stb_vorbis will not overwrite the end of the buffer.
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// The maximum buffer size needed can be gotten from get_info(); however,
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// the Vorbis I specification implies an absolute maximum of 4096 samples
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// per channel.
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// Channel coercion rules:
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// Let M be the number of channels requested, and N the number of channels present,
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// and Cn be the nth channel; let stereo L be the sum of all L and center channels,
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// and stereo R be the sum of all R and center channels (channel assignment from the
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// vorbis spec).
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// M N output
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// 1 k sum(Ck) for all k
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// 2 * stereo L, stereo R
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// k l k > l, the first l channels, then 0s
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// k l k <= l, the first k channels
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// Note that this is not _good_ surround etc. mixing at all! It's just so
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// you get something useful.
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extern int stb_vorbis_get_samples_float_interleaved(stb_vorbis *f, int channels, float *buffer, int num_floats);
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extern int stb_vorbis_get_samples_float(stb_vorbis *f, int channels, float **buffer, int num_samples);
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// gets num_samples samples, not necessarily on a frame boundary--this requires
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// buffering so you have to supply the buffers. DOES NOT APPLY THE COERCION RULES.
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// Returns the number of samples stored per channel; it may be less than requested
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// at the end of the file. If there are no more samples in the file, returns 0.
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#ifndef STB_VORBIS_NO_INTEGER_CONVERSION
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extern int stb_vorbis_get_samples_short_interleaved(stb_vorbis *f, int channels, short *buffer, int num_shorts);
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extern int stb_vorbis_get_samples_short(stb_vorbis *f, int channels, short **buffer, int num_samples);
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#endif
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// gets num_samples samples, not necessarily on a frame boundary--this requires
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// buffering so you have to supply the buffers. Applies the coercion rules above
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// to produce 'channels' channels. Returns the number of samples stored per channel;
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// it may be less than requested at the end of the file. If there are no more
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// samples in the file, returns 0.
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#endif
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//////// ERROR CODES
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enum STBVorbisError
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{
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VORBIS__no_error,
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VORBIS_need_more_data=1, // not a real error
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VORBIS_invalid_api_mixing, // can't mix API modes
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VORBIS_outofmem, // not enough memory
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VORBIS_feature_not_supported, // uses floor 0
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VORBIS_too_many_channels, // STB_VORBIS_MAX_CHANNELS is too small
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VORBIS_file_open_failure, // fopen() failed
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VORBIS_seek_without_length, // can't seek in unknown-length file
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VORBIS_unexpected_eof=10, // file is truncated?
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VORBIS_seek_invalid, // seek past EOF
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// decoding errors (corrupt/invalid stream) -- you probably
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// don't care about the exact details of these
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// vorbis errors:
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VORBIS_invalid_setup=20,
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VORBIS_invalid_stream,
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// ogg errors:
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VORBIS_missing_capture_pattern=30,
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VORBIS_invalid_stream_structure_version,
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VORBIS_continued_packet_flag_invalid,
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VORBIS_incorrect_stream_serial_number,
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VORBIS_invalid_first_page,
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VORBIS_bad_packet_type,
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VORBIS_cant_find_last_page,
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VORBIS_seek_failed,
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VORBIS_ogg_skeleton_not_supported
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};
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#ifdef __cplusplus
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}
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#endif
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#endif // STB_VORBIS_INCLUDE_STB_VORBIS_H
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//
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// HEADER ENDS HERE
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//
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//////////////////////////////////////////////////////////////////////////////
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#ifndef STB_VORBIS_HEADER_ONLY
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// global configuration settings (e.g. set these in the project/makefile),
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// or just set them in this file at the top (although ideally the first few
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// should be visible when the header file is compiled too, although it's not
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// crucial)
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// STB_VORBIS_NO_PUSHDATA_API
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// does not compile the code for the various stb_vorbis_*_pushdata()
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// functions
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// #define STB_VORBIS_NO_PUSHDATA_API
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// STB_VORBIS_NO_PULLDATA_API
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// does not compile the code for the non-pushdata APIs
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// #define STB_VORBIS_NO_PULLDATA_API
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// STB_VORBIS_NO_STDIO
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// does not compile the code for the APIs that use FILE *s internally
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// or externally (implied by STB_VORBIS_NO_PULLDATA_API)
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// #define STB_VORBIS_NO_STDIO
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// STB_VORBIS_NO_INTEGER_CONVERSION
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// does not compile the code for converting audio sample data from
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// float to integer (implied by STB_VORBIS_NO_PULLDATA_API)
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// #define STB_VORBIS_NO_INTEGER_CONVERSION
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// STB_VORBIS_NO_FAST_SCALED_FLOAT
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// does not use a fast float-to-int trick to accelerate float-to-int on
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// most platforms which requires endianness be defined correctly.
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//#define STB_VORBIS_NO_FAST_SCALED_FLOAT
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// STB_VORBIS_MAX_CHANNELS [number]
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// globally define this to the maximum number of channels you need.
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// The spec does not put a restriction on channels except that
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// the count is stored in a byte, so 255 is the hard limit.
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// Reducing this saves about 16 bytes per value, so using 16 saves
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// (255-16)*16 or around 4KB. Plus anything other memory usage
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// I forgot to account for. Can probably go as low as 8 (7.1 audio),
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// 6 (5.1 audio), or 2 (stereo only).
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#ifndef STB_VORBIS_MAX_CHANNELS
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#define STB_VORBIS_MAX_CHANNELS 16 // enough for anyone?
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#endif
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// STB_VORBIS_PUSHDATA_CRC_COUNT [number]
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// after a flush_pushdata(), stb_vorbis begins scanning for the
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// next valid page, without backtracking. when it finds something
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// that looks like a page, it streams through it and verifies its
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// CRC32. Should that validation fail, it keeps scanning. But it's
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// possible that _while_ streaming through to check the CRC32 of
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// one candidate page, it sees another candidate page. This #define
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// determines how many "overlapping" candidate pages it can search
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// at once. Note that "real" pages are typically ~4KB to ~8KB, whereas
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// garbage pages could be as big as 64KB, but probably average ~16KB.
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// So don't hose ourselves by scanning an apparent 64KB page and
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// missing a ton of real ones in the interim; so minimum of 2
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#ifndef STB_VORBIS_PUSHDATA_CRC_COUNT
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#define STB_VORBIS_PUSHDATA_CRC_COUNT 4
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#endif
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// STB_VORBIS_FAST_HUFFMAN_LENGTH [number]
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// sets the log size of the huffman-acceleration table. Maximum
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// supported value is 24. with larger numbers, more decodings are O(1),
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// but the table size is larger so worse cache missing, so you'll have
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// to probe (and try multiple ogg vorbis files) to find the sweet spot.
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#ifndef STB_VORBIS_FAST_HUFFMAN_LENGTH
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#define STB_VORBIS_FAST_HUFFMAN_LENGTH 10
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#endif
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// STB_VORBIS_FAST_BINARY_LENGTH [number]
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// sets the log size of the binary-search acceleration table. this
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// is used in similar fashion to the fast-huffman size to set initial
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// parameters for the binary search
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// STB_VORBIS_FAST_HUFFMAN_INT
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// The fast huffman tables are much more efficient if they can be
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// stored as 16-bit results instead of 32-bit results. This restricts
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// the codebooks to having only 65535 possible outcomes, though.
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// (At least, accelerated by the huffman table.)
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#ifndef STB_VORBIS_FAST_HUFFMAN_INT
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#define STB_VORBIS_FAST_HUFFMAN_SHORT
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#endif
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// STB_VORBIS_NO_HUFFMAN_BINARY_SEARCH
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// If the 'fast huffman' search doesn't succeed, then stb_vorbis falls
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// back on binary searching for the correct one. This requires storing
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// extra tables with the huffman codes in sorted order. Defining this
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// symbol trades off space for speed by forcing a linear search in the
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// non-fast case, except for "sparse" codebooks.
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// #define STB_VORBIS_NO_HUFFMAN_BINARY_SEARCH
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// STB_VORBIS_DIVIDES_IN_RESIDUE
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// stb_vorbis precomputes the result of the scalar residue decoding
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// that would otherwise require a divide per chunk. you can trade off
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// space for time by defining this symbol.
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// #define STB_VORBIS_DIVIDES_IN_RESIDUE
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// STB_VORBIS_DIVIDES_IN_CODEBOOK
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// vorbis VQ codebooks can be encoded two ways: with every case explicitly
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// stored, or with all elements being chosen from a small range of values,
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// and all values possible in all elements. By default, stb_vorbis expands
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// this latter kind out to look like the former kind for ease of decoding,
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// because otherwise an integer divide-per-vector-element is required to
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// unpack the index. If you define STB_VORBIS_DIVIDES_IN_CODEBOOK, you can
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// trade off storage for speed.
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//#define STB_VORBIS_DIVIDES_IN_CODEBOOK
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#ifdef STB_VORBIS_CODEBOOK_SHORTS
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#error "STB_VORBIS_CODEBOOK_SHORTS is no longer supported as it produced incorrect results for some input formats"
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#endif
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// STB_VORBIS_DIVIDE_TABLE
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// this replaces small integer divides in the floor decode loop with
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// table lookups. made less than 1% difference, so disabled by default.
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// STB_VORBIS_NO_INLINE_DECODE
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// disables the inlining of the scalar codebook fast-huffman decode.
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// might save a little codespace; useful for debugging
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// #define STB_VORBIS_NO_INLINE_DECODE
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// STB_VORBIS_NO_DEFER_FLOOR
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// Normally we only decode the floor without synthesizing the actual
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// full curve. We can instead synthesize the curve immediately. This
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// requires more memory and is very likely slower, so I don't think
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// you'd ever want to do it except for debugging.
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// #define STB_VORBIS_NO_DEFER_FLOOR
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//////////////////////////////////////////////////////////////////////////////
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#ifdef STB_VORBIS_NO_PULLDATA_API
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#define STB_VORBIS_NO_INTEGER_CONVERSION
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#define STB_VORBIS_NO_STDIO
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#endif
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#if defined(STB_VORBIS_NO_CRT) && !defined(STB_VORBIS_NO_STDIO)
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#define STB_VORBIS_NO_STDIO 1
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#endif
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#ifndef STB_VORBIS_NO_INTEGER_CONVERSION
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#ifndef STB_VORBIS_NO_FAST_SCALED_FLOAT
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// only need endianness for fast-float-to-int, which we don't
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// use for pushdata
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#ifndef STB_VORBIS_BIG_ENDIAN
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#define STB_VORBIS_ENDIAN 0
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#else
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#define STB_VORBIS_ENDIAN 1
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#endif
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#endif
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#endif
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#ifndef STB_VORBIS_NO_STDIO
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#include <stdio.h>
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#endif
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#ifndef STB_VORBIS_NO_CRT
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include <math.h>
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// find definition of alloca if it's not in stdlib.h:
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#if defined(_MSC_VER) || defined(__MINGW32__)
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#include <malloc.h>
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#endif
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#if defined(__linux__) || defined(__linux) || defined(__EMSCRIPTEN__)
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#include <alloca.h>
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#endif
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#else // STB_VORBIS_NO_CRT
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#define NULL 0
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#define malloc(s) 0
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#define free(s) ((void) 0)
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#define realloc(s,d) 0
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#endif // STB_VORBIS_NO_CRT
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#include <limits.h>
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#ifdef __MINGW32__
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// eff you mingw:
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// "fixed":
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// http://sourceforge.net/p/mingw-w64/mailman/message/32882927/
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// "no that broke the build, reverted, who cares about C":
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// http://sourceforge.net/p/mingw-w64/mailman/message/32890381/
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#ifdef __forceinline
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#undef __forceinline
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#endif
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#define __forceinline
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#define alloca __builtin_alloca
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#elif !defined(_MSC_VER)
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#if __GNUC__
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#define __forceinline inline
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#else
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#define __forceinline
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#endif
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#endif
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#if STB_VORBIS_MAX_CHANNELS > 256
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#error "Value of STB_VORBIS_MAX_CHANNELS outside of allowed range"
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#endif
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#if STB_VORBIS_FAST_HUFFMAN_LENGTH > 24
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#error "Value of STB_VORBIS_FAST_HUFFMAN_LENGTH outside of allowed range"
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#endif
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#if 0
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#include <crtdbg.h>
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#define CHECK(f) _CrtIsValidHeapPointer(f->channel_buffers[1])
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#else
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#define CHECK(f) ((void) 0)
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#endif
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#define MAX_BLOCKSIZE_LOG 13 // from specification
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#define MAX_BLOCKSIZE (1 << MAX_BLOCKSIZE_LOG)
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typedef unsigned char uint8;
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typedef signed char int8;
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typedef unsigned short uint16;
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typedef signed short int16;
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typedef unsigned int uint32;
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typedef signed int int32;
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#ifndef TRUE
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#define TRUE 1
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#define FALSE 0
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#endif
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typedef float codetype;
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// @NOTE
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//
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// Some arrays below are tagged "//varies", which means it's actually
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// a variable-sized piece of data, but rather than malloc I assume it's
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// small enough it's better to just allocate it all together with the
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// main thing
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//
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// Most of the variables are specified with the smallest size I could pack
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// them into. It might give better performance to make them all full-sized
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// integers. It should be safe to freely rearrange the structures or change
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// the sizes larger--nothing relies on silently truncating etc., nor the
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// order of variables.
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#define FAST_HUFFMAN_TABLE_SIZE (1 << STB_VORBIS_FAST_HUFFMAN_LENGTH)
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#define FAST_HUFFMAN_TABLE_MASK (FAST_HUFFMAN_TABLE_SIZE - 1)
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typedef struct
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{
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int dimensions, entries;
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uint8 *codeword_lengths;
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float minimum_value;
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float delta_value;
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uint8 value_bits;
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uint8 lookup_type;
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uint8 sequence_p;
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uint8 sparse;
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uint32 lookup_values;
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codetype *multiplicands;
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uint32 *codewords;
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#ifdef STB_VORBIS_FAST_HUFFMAN_SHORT
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int16 fast_huffman[FAST_HUFFMAN_TABLE_SIZE];
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#else
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int32 fast_huffman[FAST_HUFFMAN_TABLE_SIZE];
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#endif
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uint32 *sorted_codewords;
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int *sorted_values;
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int sorted_entries;
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} Codebook;
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typedef struct
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{
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uint8 order;
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uint16 rate;
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uint16 bark_map_size;
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uint8 amplitude_bits;
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uint8 amplitude_offset;
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uint8 number_of_books;
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uint8 book_list[16]; // varies
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} Floor0;
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typedef struct
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{
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uint8 partitions;
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uint8 partition_class_list[32]; // varies
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uint8 class_dimensions[16]; // varies
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uint8 class_subclasses[16]; // varies
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uint8 class_masterbooks[16]; // varies
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int16 subclass_books[16][8]; // varies
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uint16 Xlist[31*8+2]; // varies
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uint8 sorted_order[31*8+2];
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uint8 neighbors[31*8+2][2];
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uint8 floor1_multiplier;
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uint8 rangebits;
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int values;
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} Floor1;
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typedef union
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{
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Floor0 floor0;
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Floor1 floor1;
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} Floor;
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typedef struct
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{
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uint32 begin, end;
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uint32 part_size;
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uint8 classifications;
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uint8 classbook;
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uint8 **classdata;
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int16 (*residue_books)[8];
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} Residue;
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typedef struct
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{
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uint8 magnitude;
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uint8 angle;
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uint8 mux;
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} MappingChannel;
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typedef struct
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{
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uint16 coupling_steps;
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MappingChannel *chan;
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uint8 submaps;
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uint8 submap_floor[15]; // varies
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uint8 submap_residue[15]; // varies
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} Mapping;
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typedef struct
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{
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uint8 blockflag;
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uint8 mapping;
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uint16 windowtype;
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uint16 transformtype;
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} Mode;
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typedef struct
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{
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uint32 goal_crc; // expected crc if match
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int bytes_left; // bytes left in packet
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uint32 crc_so_far; // running crc
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int bytes_done; // bytes processed in _current_ chunk
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uint32 sample_loc; // granule pos encoded in page
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} CRCscan;
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typedef struct
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{
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uint32 page_start, page_end;
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uint32 last_decoded_sample;
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} ProbedPage;
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struct stb_vorbis
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{
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// user-accessible info
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unsigned int sample_rate;
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int channels;
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unsigned int setup_memory_required;
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unsigned int temp_memory_required;
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unsigned int setup_temp_memory_required;
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char *vendor;
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int comment_list_length;
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char **comment_list;
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// input config
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#ifndef STB_VORBIS_NO_STDIO
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FILE *f;
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uint32 f_start;
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int close_on_free;
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#endif
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uint8 *stream;
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uint8 *stream_start;
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uint8 *stream_end;
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uint32 stream_len;
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uint8 push_mode;
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// the page to seek to when seeking to start, may be zero
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uint32 first_audio_page_offset;
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// p_first is the page on which the first audio packet ends
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// (but not necessarily the page on which it starts)
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ProbedPage p_first, p_last;
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// memory management
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stb_vorbis_alloc alloc;
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int setup_offset;
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int temp_offset;
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// run-time results
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int eof;
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enum STBVorbisError error;
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// user-useful data
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// header info
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int blocksize[2];
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int blocksize_0, blocksize_1;
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int codebook_count;
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Codebook *codebooks;
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int floor_count;
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uint16 floor_types[64]; // varies
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Floor *floor_config;
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int residue_count;
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uint16 residue_types[64]; // varies
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Residue *residue_config;
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int mapping_count;
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Mapping *mapping;
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int mode_count;
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Mode mode_config[64]; // varies
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uint32 total_samples;
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// decode buffer
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float *channel_buffers[STB_VORBIS_MAX_CHANNELS];
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float *outputs [STB_VORBIS_MAX_CHANNELS];
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float *previous_window[STB_VORBIS_MAX_CHANNELS];
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int previous_length;
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#ifndef STB_VORBIS_NO_DEFER_FLOOR
|
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int16 *finalY[STB_VORBIS_MAX_CHANNELS];
|
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#else
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float *floor_buffers[STB_VORBIS_MAX_CHANNELS];
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#endif
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uint32 current_loc; // sample location of next frame to decode
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|
int current_loc_valid;
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|
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// per-blocksize precomputed data
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// twiddle factors
|
|
float *A[2],*B[2],*C[2];
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float *window[2];
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uint16 *bit_reverse[2];
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|
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// current page/packet/segment streaming info
|
|
uint32 serial; // stream serial number for verification
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|
int last_page;
|
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int segment_count;
|
|
uint8 segments[255];
|
|
uint8 page_flag;
|
|
uint8 bytes_in_seg;
|
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uint8 first_decode;
|
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int next_seg;
|
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int last_seg; // flag that we're on the last segment
|
|
int last_seg_which; // what was the segment number of the last seg?
|
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uint32 acc;
|
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int valid_bits;
|
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int packet_bytes;
|
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int end_seg_with_known_loc;
|
|
uint32 known_loc_for_packet;
|
|
int discard_samples_deferred;
|
|
uint32 samples_output;
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|
|
// push mode scanning
|
|
int page_crc_tests; // only in push_mode: number of tests active; -1 if not searching
|
|
#ifndef STB_VORBIS_NO_PUSHDATA_API
|
|
CRCscan scan[STB_VORBIS_PUSHDATA_CRC_COUNT];
|
|
#endif
|
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|
|
// sample-access
|
|
int channel_buffer_start;
|
|
int channel_buffer_end;
|
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};
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|
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#if defined(STB_VORBIS_NO_PUSHDATA_API)
|
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#define IS_PUSH_MODE(f) FALSE
|
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#elif defined(STB_VORBIS_NO_PULLDATA_API)
|
|
#define IS_PUSH_MODE(f) TRUE
|
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#else
|
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#define IS_PUSH_MODE(f) ((f)->push_mode)
|
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#endif
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|
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typedef struct stb_vorbis vorb;
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|
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static int error(vorb *f, enum STBVorbisError e)
|
|
{
|
|
f->error = e;
|
|
if (!f->eof && e != VORBIS_need_more_data) {
|
|
f->error=e; // breakpoint for debugging
|
|
}
|
|
return 0;
|
|
}
|
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|
|
|
|
// these functions are used for allocating temporary memory
|
|
// while decoding. if you can afford the stack space, use
|
|
// alloca(); otherwise, provide a temp buffer and it will
|
|
// allocate out of those.
|
|
|
|
#define array_size_required(count,size) (count*(sizeof(void *)+(size)))
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|
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#define temp_alloc(f,size) (f->alloc.alloc_buffer ? setup_temp_malloc(f,size) : alloca(size))
|
|
#define temp_free(f,p) (void)0
|
|
#define temp_alloc_save(f) ((f)->temp_offset)
|
|
#define temp_alloc_restore(f,p) ((f)->temp_offset = (p))
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|
|
#define temp_block_array(f,count,size) make_block_array(temp_alloc(f,array_size_required(count,size)), count, size)
|
|
|
|
// given a sufficiently large block of memory, make an array of pointers to subblocks of it
|
|
static void *make_block_array(void *mem, int count, int size)
|
|
{
|
|
int i;
|
|
void ** p = (void **) mem;
|
|
char *q = (char *) (p + count);
|
|
for (i=0; i < count; ++i) {
|
|
p[i] = q;
|
|
q += size;
|
|
}
|
|
return p;
|
|
}
|
|
|
|
static void *setup_malloc(vorb *f, int sz)
|
|
{
|
|
sz = (sz+7) & ~7; // round up to nearest 8 for alignment of future allocs.
|
|
f->setup_memory_required += sz;
|
|
if (f->alloc.alloc_buffer) {
|
|
void *p = (char *) f->alloc.alloc_buffer + f->setup_offset;
|
|
if (f->setup_offset + sz > f->temp_offset) return NULL;
|
|
f->setup_offset += sz;
|
|
return p;
|
|
}
|
|
return sz ? malloc(sz) : NULL;
|
|
}
|
|
|
|
static void setup_free(vorb *f, void *p)
|
|
{
|
|
if (f->alloc.alloc_buffer) return; // do nothing; setup mem is a stack
|
|
free(p);
|
|
}
|
|
|
|
static void *setup_temp_malloc(vorb *f, int sz)
|
|
{
|
|
sz = (sz+7) & ~7; // round up to nearest 8 for alignment of future allocs.
|
|
if (f->alloc.alloc_buffer) {
|
|
if (f->temp_offset - sz < f->setup_offset) return NULL;
|
|
f->temp_offset -= sz;
|
|
return (char *) f->alloc.alloc_buffer + f->temp_offset;
|
|
}
|
|
return malloc(sz);
|
|
}
|
|
|
|
static void setup_temp_free(vorb *f, void *p, int sz)
|
|
{
|
|
if (f->alloc.alloc_buffer) {
|
|
f->temp_offset += (sz+3)&~3;
|
|
return;
|
|
}
|
|
free(p);
|
|
}
|
|
|
|
#define CRC32_POLY 0x04c11db7 // from spec
|
|
|
|
static uint32 crc_table[256];
|
|
static void crc32_init(void)
|
|
{
|
|
int i,j;
|
|
uint32 s;
|
|
for(i=0; i < 256; i++) {
|
|
for (s=(uint32) i << 24, j=0; j < 8; ++j)
|
|
s = (s << 1) ^ (s >= (1U<<31) ? CRC32_POLY : 0);
|
|
crc_table[i] = s;
|
|
}
|
|
}
|
|
|
|
static __forceinline uint32 crc32_update(uint32 crc, uint8 byte)
|
|
{
|
|
return (crc << 8) ^ crc_table[byte ^ (crc >> 24)];
|
|
}
|
|
|
|
|
|
// used in setup, and for huffman that doesn't go fast path
|
|
static unsigned int bit_reverse(unsigned int n)
|
|
{
|
|
n = ((n & 0xAAAAAAAA) >> 1) | ((n & 0x55555555) << 1);
|
|
n = ((n & 0xCCCCCCCC) >> 2) | ((n & 0x33333333) << 2);
|
|
n = ((n & 0xF0F0F0F0) >> 4) | ((n & 0x0F0F0F0F) << 4);
|
|
n = ((n & 0xFF00FF00) >> 8) | ((n & 0x00FF00FF) << 8);
|
|
return (n >> 16) | (n << 16);
|
|
}
|
|
|
|
static float square(float x)
|
|
{
|
|
return x*x;
|
|
}
|
|
|
|
// this is a weird definition of log2() for which log2(1) = 1, log2(2) = 2, log2(4) = 3
|
|
// as required by the specification. fast(?) implementation from stb.h
|
|
// @OPTIMIZE: called multiple times per-packet with "constants"; move to setup
|
|
static int ilog(int32 n)
|
|
{
|
|
static signed char log2_4[16] = { 0,1,2,2,3,3,3,3,4,4,4,4,4,4,4,4 };
|
|
|
|
if (n < 0) return 0; // signed n returns 0
|
|
|
|
// 2 compares if n < 16, 3 compares otherwise (4 if signed or n > 1<<29)
|
|
if (n < (1 << 14))
|
|
if (n < (1 << 4)) return 0 + log2_4[n ];
|
|
else if (n < (1 << 9)) return 5 + log2_4[n >> 5];
|
|
else return 10 + log2_4[n >> 10];
|
|
else if (n < (1 << 24))
|
|
if (n < (1 << 19)) return 15 + log2_4[n >> 15];
|
|
else return 20 + log2_4[n >> 20];
|
|
else if (n < (1 << 29)) return 25 + log2_4[n >> 25];
|
|
else return 30 + log2_4[n >> 30];
|
|
}
|
|
|
|
#ifndef M_PI
|
|
#define M_PI 3.14159265358979323846264f // from CRC
|
|
#endif
|
|
|
|
// code length assigned to a value with no huffman encoding
|
|
#define NO_CODE 255
|
|
|
|
/////////////////////// LEAF SETUP FUNCTIONS //////////////////////////
|
|
//
|
|
// these functions are only called at setup, and only a few times
|
|
// per file
|
|
|
|
static float float32_unpack(uint32 x)
|
|
{
|
|
// from the specification
|
|
uint32 mantissa = x & 0x1fffff;
|
|
uint32 sign = x & 0x80000000;
|
|
uint32 exp = (x & 0x7fe00000) >> 21;
|
|
double res = sign ? -(double)mantissa : (double)mantissa;
|
|
return (float) ldexp((float)res, exp-788);
|
|
}
|
|
|
|
|
|
// zlib & jpeg huffman tables assume that the output symbols
|
|
// can either be arbitrarily arranged, or have monotonically
|
|
// increasing frequencies--they rely on the lengths being sorted;
|
|
// this makes for a very simple generation algorithm.
|
|
// vorbis allows a huffman table with non-sorted lengths. This
|
|
// requires a more sophisticated construction, since symbols in
|
|
// order do not map to huffman codes "in order".
|
|
static void add_entry(Codebook *c, uint32 huff_code, int symbol, int count, int len, uint32 *values)
|
|
{
|
|
if (!c->sparse) {
|
|
c->codewords [symbol] = huff_code;
|
|
} else {
|
|
c->codewords [count] = huff_code;
|
|
c->codeword_lengths[count] = len;
|
|
values [count] = symbol;
|
|
}
|
|
}
|
|
|
|
static int compute_codewords(Codebook *c, uint8 *len, int n, uint32 *values)
|
|
{
|
|
int i,k,m=0;
|
|
uint32 available[32];
|
|
|
|
memset(available, 0, sizeof(available));
|
|
// find the first entry
|
|
for (k=0; k < n; ++k) if (len[k] < NO_CODE) break;
|
|
if (k == n) { assert(c->sorted_entries == 0); return TRUE; }
|
|
// add to the list
|
|
add_entry(c, 0, k, m++, len[k], values);
|
|
// add all available leaves
|
|
for (i=1; i <= len[k]; ++i)
|
|
available[i] = 1U << (32-i);
|
|
// note that the above code treats the first case specially,
|
|
// but it's really the same as the following code, so they
|
|
// could probably be combined (except the initial code is 0,
|
|
// and I use 0 in available[] to mean 'empty')
|
|
for (i=k+1; i < n; ++i) {
|
|
uint32 res;
|
|
int z = len[i], y;
|
|
if (z == NO_CODE) continue;
|
|
// find lowest available leaf (should always be earliest,
|
|
// which is what the specification calls for)
|
|
// note that this property, and the fact we can never have
|
|
// more than one free leaf at a given level, isn't totally
|
|
// trivial to prove, but it seems true and the assert never
|
|
// fires, so!
|
|
while (z > 0 && !available[z]) --z;
|
|
if (z == 0) { return FALSE; }
|
|
res = available[z];
|
|
assert(z >= 0 && z < 32);
|
|
available[z] = 0;
|
|
add_entry(c, bit_reverse(res), i, m++, len[i], values);
|
|
// propagate availability up the tree
|
|
if (z != len[i]) {
|
|
assert(len[i] >= 0 && len[i] < 32);
|
|
for (y=len[i]; y > z; --y) {
|
|
assert(available[y] == 0);
|
|
available[y] = res + (1 << (32-y));
|
|
}
|
|
}
|
|
}
|
|
return TRUE;
|
|
}
|
|
|
|
// accelerated huffman table allows fast O(1) match of all symbols
|
|
// of length <= STB_VORBIS_FAST_HUFFMAN_LENGTH
|
|
static void compute_accelerated_huffman(Codebook *c)
|
|
{
|
|
int i, len;
|
|
for (i=0; i < FAST_HUFFMAN_TABLE_SIZE; ++i)
|
|
c->fast_huffman[i] = -1;
|
|
|
|
len = c->sparse ? c->sorted_entries : c->entries;
|
|
#ifdef STB_VORBIS_FAST_HUFFMAN_SHORT
|
|
if (len > 32767) len = 32767; // largest possible value we can encode!
|
|
#endif
|
|
for (i=0; i < len; ++i) {
|
|
if (c->codeword_lengths[i] <= STB_VORBIS_FAST_HUFFMAN_LENGTH) {
|
|
uint32 z = c->sparse ? bit_reverse(c->sorted_codewords[i]) : c->codewords[i];
|
|
// set table entries for all bit combinations in the higher bits
|
|
while (z < FAST_HUFFMAN_TABLE_SIZE) {
|
|
c->fast_huffman[z] = i;
|
|
z += 1 << c->codeword_lengths[i];
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
#ifdef _MSC_VER
|
|
#define STBV_CDECL __cdecl
|
|
#else
|
|
#define STBV_CDECL
|
|
#endif
|
|
|
|
static int STBV_CDECL uint32_compare(const void *p, const void *q)
|
|
{
|
|
uint32 x = * (uint32 *) p;
|
|
uint32 y = * (uint32 *) q;
|
|
return x < y ? -1 : x > y;
|
|
}
|
|
|
|
static int include_in_sort(Codebook *c, uint8 len)
|
|
{
|
|
if (c->sparse) { assert(len != NO_CODE); return TRUE; }
|
|
if (len == NO_CODE) return FALSE;
|
|
if (len > STB_VORBIS_FAST_HUFFMAN_LENGTH) return TRUE;
|
|
return FALSE;
|
|
}
|
|
|
|
// if the fast table above doesn't work, we want to binary
|
|
// search them... need to reverse the bits
|
|
static void compute_sorted_huffman(Codebook *c, uint8 *lengths, uint32 *values)
|
|
{
|
|
int i, len;
|
|
// build a list of all the entries
|
|
// OPTIMIZATION: don't include the short ones, since they'll be caught by FAST_HUFFMAN.
|
|
// this is kind of a frivolous optimization--I don't see any performance improvement,
|
|
// but it's like 4 extra lines of code, so.
|
|
if (!c->sparse) {
|
|
int k = 0;
|
|
for (i=0; i < c->entries; ++i)
|
|
if (include_in_sort(c, lengths[i]))
|
|
c->sorted_codewords[k++] = bit_reverse(c->codewords[i]);
|
|
assert(k == c->sorted_entries);
|
|
} else {
|
|
for (i=0; i < c->sorted_entries; ++i)
|
|
c->sorted_codewords[i] = bit_reverse(c->codewords[i]);
|
|
}
|
|
|
|
qsort(c->sorted_codewords, c->sorted_entries, sizeof(c->sorted_codewords[0]), uint32_compare);
|
|
c->sorted_codewords[c->sorted_entries] = 0xffffffff;
|
|
|
|
len = c->sparse ? c->sorted_entries : c->entries;
|
|
// now we need to indicate how they correspond; we could either
|
|
// #1: sort a different data structure that says who they correspond to
|
|
// #2: for each sorted entry, search the original list to find who corresponds
|
|
// #3: for each original entry, find the sorted entry
|
|
// #1 requires extra storage, #2 is slow, #3 can use binary search!
|
|
for (i=0; i < len; ++i) {
|
|
int huff_len = c->sparse ? lengths[values[i]] : lengths[i];
|
|
if (include_in_sort(c,huff_len)) {
|
|
uint32 code = bit_reverse(c->codewords[i]);
|
|
int x=0, n=c->sorted_entries;
|
|
while (n > 1) {
|
|
// invariant: sc[x] <= code < sc[x+n]
|
|
int m = x + (n >> 1);
|
|
if (c->sorted_codewords[m] <= code) {
|
|
x = m;
|
|
n -= (n>>1);
|
|
} else {
|
|
n >>= 1;
|
|
}
|
|
}
|
|
assert(c->sorted_codewords[x] == code);
|
|
if (c->sparse) {
|
|
c->sorted_values[x] = values[i];
|
|
c->codeword_lengths[x] = huff_len;
|
|
} else {
|
|
c->sorted_values[x] = i;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// only run while parsing the header (3 times)
|
|
static int vorbis_validate(uint8 *data)
|
|
{
|
|
static uint8 vorbis[6] = { 'v', 'o', 'r', 'b', 'i', 's' };
|
|
return memcmp(data, vorbis, 6) == 0;
|
|
}
|
|
|
|
// called from setup only, once per code book
|
|
// (formula implied by specification)
|
|
static int lookup1_values(int entries, int dim)
|
|
{
|
|
int r = (int) floor(exp((float) log((float) entries) / dim));
|
|
if ((int) floor(powerd((float) r+1, dim)) <= entries) // (int) cast for MinGW warning;
|
|
++r; // floor() to avoid _ftol() when non-CRT
|
|
if (powerd((float) r+1, dim) <= entries)
|
|
return -1;
|
|
if ((int) floor(powerd((float) r, dim)) > entries)
|
|
return -1;
|
|
return r;
|
|
}
|
|
|
|
// called twice per file
|
|
static void compute_twiddle_factors(int n, float *A, float *B, float *C)
|
|
{
|
|
int n4 = n >> 2, n8 = n >> 3;
|
|
int k,k2;
|
|
|
|
for (k=k2=0; k < n4; ++k,k2+=2) {
|
|
A[k2 ] = (float) cos(4*k*M_PI/n);
|
|
A[k2+1] = (float) -sin(4*k*M_PI/n);
|
|
B[k2 ] = (float) cos((k2+1)*M_PI/n/2) * 0.5f;
|
|
B[k2+1] = (float) sin((k2+1)*M_PI/n/2) * 0.5f;
|
|
}
|
|
for (k=k2=0; k < n8; ++k,k2+=2) {
|
|
C[k2 ] = (float) cos(2*(k2+1)*M_PI/n);
|
|
C[k2+1] = (float) -sin(2*(k2+1)*M_PI/n);
|
|
}
|
|
}
|
|
|
|
static void compute_window(int n, float *window)
|
|
{
|
|
int n2 = n >> 1, i;
|
|
for (i=0; i < n2; ++i)
|
|
window[i] = (float) sin(0.5 * M_PI * square((float) sin((i - 0 + 0.5) / n2 * 0.5 * M_PI)));
|
|
}
|
|
|
|
static void compute_bitreverse(int n, uint16 *rev)
|
|
{
|
|
int ld = ilog(n) - 1; // ilog is off-by-one from normal definitions
|
|
int i, n8 = n >> 3;
|
|
for (i=0; i < n8; ++i)
|
|
rev[i] = (bit_reverse(i) >> (32-ld+3)) << 2;
|
|
}
|
|
|
|
static int init_blocksize(vorb *f, int b, int n)
|
|
{
|
|
int n2 = n >> 1, n4 = n >> 2, n8 = n >> 3;
|
|
f->A[b] = (float *) setup_malloc(f, sizeof(float) * n2);
|
|
f->B[b] = (float *) setup_malloc(f, sizeof(float) * n2);
|
|
f->C[b] = (float *) setup_malloc(f, sizeof(float) * n4);
|
|
if (!f->A[b] || !f->B[b] || !f->C[b]) return error(f, VORBIS_outofmem);
|
|
compute_twiddle_factors(n, f->A[b], f->B[b], f->C[b]);
|
|
f->window[b] = (float *) setup_malloc(f, sizeof(float) * n2);
|
|
if (!f->window[b]) return error(f, VORBIS_outofmem);
|
|
compute_window(n, f->window[b]);
|
|
f->bit_reverse[b] = (uint16 *) setup_malloc(f, sizeof(uint16) * n8);
|
|
if (!f->bit_reverse[b]) return error(f, VORBIS_outofmem);
|
|
compute_bitreverse(n, f->bit_reverse[b]);
|
|
return TRUE;
|
|
}
|
|
|
|
static void neighbors(uint16 *x, int n, int *plow, int *phigh)
|
|
{
|
|
int low = -1;
|
|
int high = 65536;
|
|
int i;
|
|
for (i=0; i < n; ++i) {
|
|
if (x[i] > low && x[i] < x[n]) { *plow = i; low = x[i]; }
|
|
if (x[i] < high && x[i] > x[n]) { *phigh = i; high = x[i]; }
|
|
}
|
|
}
|
|
|
|
// this has been repurposed so y is now the original index instead of y
|
|
typedef struct
|
|
{
|
|
uint16 x,id;
|
|
} stbv__floor_ordering;
|
|
|
|
static int STBV_CDECL point_compare(const void *p, const void *q)
|
|
{
|
|
stbv__floor_ordering *a = (stbv__floor_ordering *) p;
|
|
stbv__floor_ordering *b = (stbv__floor_ordering *) q;
|
|
return a->x < b->x ? -1 : a->x > b->x;
|
|
}
|
|
|
|
//
|
|
/////////////////////// END LEAF SETUP FUNCTIONS //////////////////////////
|
|
|
|
|
|
#if defined(STB_VORBIS_NO_STDIO)
|
|
#define USE_MEMORY(z) TRUE
|
|
#else
|
|
#define USE_MEMORY(z) ((z)->stream)
|
|
#endif
|
|
|
|
static uint8 get8(vorb *z)
|
|
{
|
|
if (USE_MEMORY(z)) {
|
|
if (z->stream >= z->stream_end) { z->eof = TRUE; return 0; }
|
|
return *z->stream++;
|
|
}
|
|
|
|
#ifndef STB_VORBIS_NO_STDIO
|
|
{
|
|
int c = fgetc(z->f);
|
|
if (c == EOF) { z->eof = TRUE; return 0; }
|
|
return c;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static uint32 get32(vorb *f)
|
|
{
|
|
uint32 x;
|
|
x = get8(f);
|
|
x += get8(f) << 8;
|
|
x += get8(f) << 16;
|
|
x += (uint32) get8(f) << 24;
|
|
return x;
|
|
}
|
|
|
|
static int getn(vorb *z, uint8 *data, int n)
|
|
{
|
|
if (USE_MEMORY(z)) {
|
|
if (z->stream+n > z->stream_end) { z->eof = 1; return 0; }
|
|
memcpy(data, z->stream, n);
|
|
z->stream += n;
|
|
return 1;
|
|
}
|
|
|
|
#ifndef STB_VORBIS_NO_STDIO
|
|
if (fread(data, n, 1, z->f) == 1)
|
|
return 1;
|
|
else {
|
|
z->eof = 1;
|
|
return 0;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static void skip(vorb *z, int n)
|
|
{
|
|
if (USE_MEMORY(z)) {
|
|
z->stream += n;
|
|
if (z->stream >= z->stream_end) z->eof = 1;
|
|
return;
|
|
}
|
|
#ifndef STB_VORBIS_NO_STDIO
|
|
{
|
|
long x = ftell(z->f);
|
|
fseek(z->f, x+n, SEEK_SET);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static int set_file_offset(stb_vorbis *f, unsigned int loc)
|
|
{
|
|
#ifndef STB_VORBIS_NO_PUSHDATA_API
|
|
if (f->push_mode) return 0;
|
|
#endif
|
|
f->eof = 0;
|
|
if (USE_MEMORY(f)) {
|
|
if (f->stream_start + loc >= f->stream_end || f->stream_start + loc < f->stream_start) {
|
|
f->stream = f->stream_end;
|
|
f->eof = 1;
|
|
return 0;
|
|
} else {
|
|
f->stream = f->stream_start + loc;
|
|
return 1;
|
|
}
|
|
}
|
|
#ifndef STB_VORBIS_NO_STDIO
|
|
if (loc + f->f_start < loc || loc >= 0x80000000) {
|
|
loc = 0x7fffffff;
|
|
f->eof = 1;
|
|
} else {
|
|
loc += f->f_start;
|
|
}
|
|
if (!fseek(f->f, loc, SEEK_SET))
|
|
return 1;
|
|
f->eof = 1;
|
|
fseek(f->f, f->f_start, SEEK_END);
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
|
|
static uint8 ogg_page_header[4] = { 0x4f, 0x67, 0x67, 0x53 };
|
|
|
|
static int capture_pattern(vorb *f)
|
|
{
|
|
if (0x4f != get8(f)) return FALSE;
|
|
if (0x67 != get8(f)) return FALSE;
|
|
if (0x67 != get8(f)) return FALSE;
|
|
if (0x53 != get8(f)) return FALSE;
|
|
return TRUE;
|
|
}
|
|
|
|
#define PAGEFLAG_continued_packet 1
|
|
#define PAGEFLAG_first_page 2
|
|
#define PAGEFLAG_last_page 4
|
|
|
|
static int start_page_no_capturepattern(vorb *f)
|
|
{
|
|
uint32 loc0,loc1,n;
|
|
if (f->first_decode && !IS_PUSH_MODE(f)) {
|
|
f->p_first.page_start = stb_vorbis_get_file_offset(f) - 4;
|
|
}
|
|
// stream structure version
|
|
if (0 != get8(f)) return error(f, VORBIS_invalid_stream_structure_version);
|
|
// header flag
|
|
f->page_flag = get8(f);
|
|
// absolute granule position
|
|
loc0 = get32(f);
|
|
loc1 = get32(f);
|
|
// @TODO: validate loc0,loc1 as valid positions?
|
|
// stream serial number -- vorbis doesn't interleave, so discard
|
|
get32(f);
|
|
//if (f->serial != get32(f)) return error(f, VORBIS_incorrect_stream_serial_number);
|
|
// page sequence number
|
|
n = get32(f);
|
|
f->last_page = n;
|
|
// CRC32
|
|
get32(f);
|
|
// page_segments
|
|
f->segment_count = get8(f);
|
|
if (!getn(f, f->segments, f->segment_count))
|
|
return error(f, VORBIS_unexpected_eof);
|
|
// assume we _don't_ know any the sample position of any segments
|
|
f->end_seg_with_known_loc = -2;
|
|
if (loc0 != ~0U || loc1 != ~0U) {
|
|
int i;
|
|
// determine which packet is the last one that will complete
|
|
for (i=f->segment_count-1; i >= 0; --i)
|
|
if (f->segments[i] < 255)
|
|
break;
|
|
// 'i' is now the index of the _last_ segment of a packet that ends
|
|
if (i >= 0) {
|
|
f->end_seg_with_known_loc = i;
|
|
f->known_loc_for_packet = loc0;
|
|
}
|
|
}
|
|
if (f->first_decode) {
|
|
int i,len;
|
|
len = 0;
|
|
for (i=0; i < f->segment_count; ++i)
|
|
len += f->segments[i];
|
|
len += 27 + f->segment_count;
|
|
f->p_first.page_end = f->p_first.page_start + len;
|
|
f->p_first.last_decoded_sample = loc0;
|
|
}
|
|
f->next_seg = 0;
|
|
return TRUE;
|
|
}
|
|
|
|
static int start_page(vorb *f)
|
|
{
|
|
if (!capture_pattern(f)) return error(f, VORBIS_missing_capture_pattern);
|
|
return start_page_no_capturepattern(f);
|
|
}
|
|
|
|
static int start_packet(vorb *f)
|
|
{
|
|
while (f->next_seg == -1) {
|
|
if (!start_page(f)) return FALSE;
|
|
if (f->page_flag & PAGEFLAG_continued_packet)
|
|
return error(f, VORBIS_continued_packet_flag_invalid);
|
|
}
|
|
f->last_seg = FALSE;
|
|
f->valid_bits = 0;
|
|
f->packet_bytes = 0;
|
|
f->bytes_in_seg = 0;
|
|
// f->next_seg is now valid
|
|
return TRUE;
|
|
}
|
|
|
|
static int maybe_start_packet(vorb *f)
|
|
{
|
|
if (f->next_seg == -1) {
|
|
int x = get8(f);
|
|
if (f->eof) return FALSE; // EOF at page boundary is not an error!
|
|
if (0x4f != x ) return error(f, VORBIS_missing_capture_pattern);
|
|
if (0x67 != get8(f)) return error(f, VORBIS_missing_capture_pattern);
|
|
if (0x67 != get8(f)) return error(f, VORBIS_missing_capture_pattern);
|
|
if (0x53 != get8(f)) return error(f, VORBIS_missing_capture_pattern);
|
|
if (!start_page_no_capturepattern(f)) return FALSE;
|
|
if (f->page_flag & PAGEFLAG_continued_packet) {
|
|
// set up enough state that we can read this packet if we want,
|
|
// e.g. during recovery
|
|
f->last_seg = FALSE;
|
|
f->bytes_in_seg = 0;
|
|
return error(f, VORBIS_continued_packet_flag_invalid);
|
|
}
|
|
}
|
|
return start_packet(f);
|
|
}
|
|
|
|
static int next_segment(vorb *f)
|
|
{
|
|
int len;
|
|
if (f->last_seg) return 0;
|
|
if (f->next_seg == -1) {
|
|
f->last_seg_which = f->segment_count-1; // in case start_page fails
|
|
if (!start_page(f)) { f->last_seg = 1; return 0; }
|
|
if (!(f->page_flag & PAGEFLAG_continued_packet)) return error(f, VORBIS_continued_packet_flag_invalid);
|
|
}
|
|
len = f->segments[f->next_seg++];
|
|
if (len < 255) {
|
|
f->last_seg = TRUE;
|
|
f->last_seg_which = f->next_seg-1;
|
|
}
|
|
if (f->next_seg >= f->segment_count)
|
|
f->next_seg = -1;
|
|
assert(f->bytes_in_seg == 0);
|
|
f->bytes_in_seg = len;
|
|
return len;
|
|
}
|
|
|
|
#define EOP (-1)
|
|
#define INVALID_BITS (-1)
|
|
|
|
static int get8_packet_raw(vorb *f)
|
|
{
|
|
if (!f->bytes_in_seg) { // CLANG!
|
|
if (f->last_seg) return EOP;
|
|
else if (!next_segment(f)) return EOP;
|
|
}
|
|
assert(f->bytes_in_seg > 0);
|
|
--f->bytes_in_seg;
|
|
++f->packet_bytes;
|
|
return get8(f);
|
|
}
|
|
|
|
static int get8_packet(vorb *f)
|
|
{
|
|
int x = get8_packet_raw(f);
|
|
f->valid_bits = 0;
|
|
return x;
|
|
}
|
|
|
|
static int get32_packet(vorb *f)
|
|
{
|
|
uint32 x;
|
|
x = get8_packet(f);
|
|
x += get8_packet(f) << 8;
|
|
x += get8_packet(f) << 16;
|
|
x += (uint32) get8_packet(f) << 24;
|
|
return x;
|
|
}
|
|
|
|
static void flush_packet(vorb *f)
|
|
{
|
|
while (get8_packet_raw(f) != EOP);
|
|
}
|
|
|
|
// @OPTIMIZE: this is the secondary bit decoder, so it's probably not as important
|
|
// as the huffman decoder?
|
|
static uint32 get_bits(vorb *f, int n)
|
|
{
|
|
uint32 z;
|
|
|
|
if (f->valid_bits < 0) return 0;
|
|
if (f->valid_bits < n) {
|
|
if (n > 24) {
|
|
// the accumulator technique below would not work correctly in this case
|
|
z = get_bits(f, 24);
|
|
z += get_bits(f, n-24) << 24;
|
|
return z;
|
|
}
|
|
if (f->valid_bits == 0) f->acc = 0;
|
|
while (f->valid_bits < n) {
|
|
int z = get8_packet_raw(f);
|
|
if (z == EOP) {
|
|
f->valid_bits = INVALID_BITS;
|
|
return 0;
|
|
}
|
|
f->acc += z << f->valid_bits;
|
|
f->valid_bits += 8;
|
|
}
|
|
}
|
|
if (f->valid_bits < 0) return 0;
|
|
z = f->acc & ((1 << n)-1);
|
|
f->acc >>= n;
|
|
f->valid_bits -= n;
|
|
return z;
|
|
}
|
|
|
|
// @OPTIMIZE: primary accumulator for huffman
|
|
// expand the buffer to as many bits as possible without reading off end of packet
|
|
// it might be nice to allow f->valid_bits and f->acc to be stored in registers,
|
|
// e.g. cache them locally and decode locally
|
|
static __forceinline void prep_huffman(vorb *f)
|
|
{
|
|
if (f->valid_bits <= 24) {
|
|
if (f->valid_bits == 0) f->acc = 0;
|
|
do {
|
|
int z;
|
|
if (f->last_seg && !f->bytes_in_seg) return;
|
|
z = get8_packet_raw(f);
|
|
if (z == EOP) return;
|
|
f->acc += (unsigned) z << f->valid_bits;
|
|
f->valid_bits += 8;
|
|
} while (f->valid_bits <= 24);
|
|
}
|
|
}
|
|
|
|
enum
|
|
{
|
|
VORBIS_packet_id = 1,
|
|
VORBIS_packet_comment = 3,
|
|
VORBIS_packet_setup = 5
|
|
};
|
|
|
|
static int codebook_decode_scalar_raw(vorb *f, Codebook *c)
|
|
{
|
|
int i;
|
|
prep_huffman(f);
|
|
|
|
if (c->codewords == NULL && c->sorted_codewords == NULL)
|
|
return -1;
|
|
|
|
// cases to use binary search: sorted_codewords && !c->codewords
|
|
// sorted_codewords && c->entries > 8
|
|
if (c->entries > 8 ? c->sorted_codewords!=NULL : !c->codewords) {
|
|
// binary search
|
|
uint32 code = bit_reverse(f->acc);
|
|
int x=0, n=c->sorted_entries, len;
|
|
|
|
while (n > 1) {
|
|
// invariant: sc[x] <= code < sc[x+n]
|
|
int m = x + (n >> 1);
|
|
if (c->sorted_codewords[m] <= code) {
|
|
x = m;
|
|
n -= (n>>1);
|
|
} else {
|
|
n >>= 1;
|
|
}
|
|
}
|
|
// x is now the sorted index
|
|
if (!c->sparse) x = c->sorted_values[x];
|
|
// x is now sorted index if sparse, or symbol otherwise
|
|
len = c->codeword_lengths[x];
|
|
if (f->valid_bits >= len) {
|
|
f->acc >>= len;
|
|
f->valid_bits -= len;
|
|
return x;
|
|
}
|
|
|
|
f->valid_bits = 0;
|
|
return -1;
|
|
}
|
|
|
|
// if small, linear search
|
|
assert(!c->sparse);
|
|
for (i=0; i < c->entries; ++i) {
|
|
if (c->codeword_lengths[i] == NO_CODE) continue;
|
|
if (c->codewords[i] == (f->acc & ((1 << c->codeword_lengths[i])-1))) {
|
|
if (f->valid_bits >= c->codeword_lengths[i]) {
|
|
f->acc >>= c->codeword_lengths[i];
|
|
f->valid_bits -= c->codeword_lengths[i];
|
|
return i;
|
|
}
|
|
f->valid_bits = 0;
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
error(f, VORBIS_invalid_stream);
|
|
f->valid_bits = 0;
|
|
return -1;
|
|
}
|
|
|
|
#ifndef STB_VORBIS_NO_INLINE_DECODE
|
|
|
|
#define DECODE_RAW(var, f,c) \
|
|
if (f->valid_bits < STB_VORBIS_FAST_HUFFMAN_LENGTH) \
|
|
prep_huffman(f); \
|
|
var = f->acc & FAST_HUFFMAN_TABLE_MASK; \
|
|
var = c->fast_huffman[var]; \
|
|
if (var >= 0) { \
|
|
int n = c->codeword_lengths[var]; \
|
|
f->acc >>= n; \
|
|
f->valid_bits -= n; \
|
|
if (f->valid_bits < 0) { f->valid_bits = 0; var = -1; } \
|
|
} else { \
|
|
var = codebook_decode_scalar_raw(f,c); \
|
|
}
|
|
|
|
#else
|
|
|
|
static int codebook_decode_scalar(vorb *f, Codebook *c)
|
|
{
|
|
int i;
|
|
if (f->valid_bits < STB_VORBIS_FAST_HUFFMAN_LENGTH)
|
|
prep_huffman(f);
|
|
// fast huffman table lookup
|
|
i = f->acc & FAST_HUFFMAN_TABLE_MASK;
|
|
i = c->fast_huffman[i];
|
|
if (i >= 0) {
|
|
f->acc >>= c->codeword_lengths[i];
|
|
f->valid_bits -= c->codeword_lengths[i];
|
|
if (f->valid_bits < 0) { f->valid_bits = 0; return -1; }
|
|
return i;
|
|
}
|
|
return codebook_decode_scalar_raw(f,c);
|
|
}
|
|
|
|
#define DECODE_RAW(var,f,c) var = codebook_decode_scalar(f,c);
|
|
|
|
#endif
|
|
|
|
#define DECODE(var,f,c) \
|
|
DECODE_RAW(var,f,c) \
|
|
if (c->sparse) var = c->sorted_values[var];
|
|
|
|
#ifndef STB_VORBIS_DIVIDES_IN_CODEBOOK
|
|
#define DECODE_VQ(var,f,c) DECODE_RAW(var,f,c)
|
|
#else
|
|
#define DECODE_VQ(var,f,c) DECODE(var,f,c)
|
|
#endif
|
|
|
|
|
|
|
|
|
|
|
|
|
|
// CODEBOOK_ELEMENT_FAST is an optimization for the CODEBOOK_FLOATS case
|
|
// where we avoid one addition
|
|
#define CODEBOOK_ELEMENT(c,off) (c->multiplicands[off])
|
|
#define CODEBOOK_ELEMENT_FAST(c,off) (c->multiplicands[off])
|
|
#define CODEBOOK_ELEMENT_BASE(c) (0)
|
|
|
|
static int codebook_decode_start(vorb *f, Codebook *c)
|
|
{
|
|
int z = -1;
|
|
|
|
// type 0 is only legal in a scalar context
|
|
if (c->lookup_type == 0)
|
|
error(f, VORBIS_invalid_stream);
|
|
else {
|
|
DECODE_VQ(z,f,c);
|
|
if (c->sparse) assert(z < c->sorted_entries);
|
|
if (z < 0) { // check for EOP
|
|
if (!f->bytes_in_seg)
|
|
if (f->last_seg)
|
|
return z;
|
|
error(f, VORBIS_invalid_stream);
|
|
}
|
|
}
|
|
return z;
|
|
}
|
|
|
|
static int codebook_decode(vorb *f, Codebook *c, float *output, int len)
|
|
{
|
|
int i,z = codebook_decode_start(f,c);
|
|
if (z < 0) return FALSE;
|
|
if (len > c->dimensions) len = c->dimensions;
|
|
|
|
#ifdef STB_VORBIS_DIVIDES_IN_CODEBOOK
|
|
if (c->lookup_type == 1) {
|
|
float last = CODEBOOK_ELEMENT_BASE(c);
|
|
int div = 1;
|
|
for (i=0; i < len; ++i) {
|
|
int off = (z / div) % c->lookup_values;
|
|
float val = CODEBOOK_ELEMENT_FAST(c,off) + last;
|
|
output[i] += val;
|
|
if (c->sequence_p) last = val + c->minimum_value;
|
|
div *= c->lookup_values;
|
|
}
|
|
return TRUE;
|
|
}
|
|
#endif
|
|
|
|
z *= c->dimensions;
|
|
if (c->sequence_p) {
|
|
float last = CODEBOOK_ELEMENT_BASE(c);
|
|
for (i=0; i < len; ++i) {
|
|
float val = CODEBOOK_ELEMENT_FAST(c,z+i) + last;
|
|
output[i] += val;
|
|
last = val + c->minimum_value;
|
|
}
|
|
} else {
|
|
float last = CODEBOOK_ELEMENT_BASE(c);
|
|
for (i=0; i < len; ++i) {
|
|
output[i] += CODEBOOK_ELEMENT_FAST(c,z+i) + last;
|
|
}
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static int codebook_decode_step(vorb *f, Codebook *c, float *output, int len, int step)
|
|
{
|
|
int i,z = codebook_decode_start(f,c);
|
|
float last = CODEBOOK_ELEMENT_BASE(c);
|
|
if (z < 0) return FALSE;
|
|
if (len > c->dimensions) len = c->dimensions;
|
|
|
|
#ifdef STB_VORBIS_DIVIDES_IN_CODEBOOK
|
|
if (c->lookup_type == 1) {
|
|
int div = 1;
|
|
for (i=0; i < len; ++i) {
|
|
int off = (z / div) % c->lookup_values;
|
|
float val = CODEBOOK_ELEMENT_FAST(c,off) + last;
|
|
output[i*step] += val;
|
|
if (c->sequence_p) last = val;
|
|
div *= c->lookup_values;
|
|
}
|
|
return TRUE;
|
|
}
|
|
#endif
|
|
|
|
z *= c->dimensions;
|
|
for (i=0; i < len; ++i) {
|
|
float val = CODEBOOK_ELEMENT_FAST(c,z+i) + last;
|
|
output[i*step] += val;
|
|
if (c->sequence_p) last = val;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static int codebook_decode_deinterleave_repeat(vorb *f, Codebook *c, float **outputs, int ch, int *c_inter_p, int *p_inter_p, int len, int total_decode)
|
|
{
|
|
int c_inter = *c_inter_p;
|
|
int p_inter = *p_inter_p;
|
|
int i,z, effective = c->dimensions;
|
|
|
|
// type 0 is only legal in a scalar context
|
|
if (c->lookup_type == 0) return error(f, VORBIS_invalid_stream);
|
|
|
|
while (total_decode > 0) {
|
|
float last = CODEBOOK_ELEMENT_BASE(c);
|
|
DECODE_VQ(z,f,c);
|
|
#ifndef STB_VORBIS_DIVIDES_IN_CODEBOOK
|
|
assert(!c->sparse || z < c->sorted_entries);
|
|
#endif
|
|
if (z < 0) {
|
|
if (!f->bytes_in_seg)
|
|
if (f->last_seg) return FALSE;
|
|
return error(f, VORBIS_invalid_stream);
|
|
}
|
|
|
|
// if this will take us off the end of the buffers, stop short!
|
|
// we check by computing the length of the virtual interleaved
|
|
// buffer (len*ch), our current offset within it (p_inter*ch)+(c_inter),
|
|
// and the length we'll be using (effective)
|
|
if (c_inter + p_inter*ch + effective > len * ch) {
|
|
effective = len*ch - (p_inter*ch - c_inter);
|
|
}
|
|
|
|
#ifdef STB_VORBIS_DIVIDES_IN_CODEBOOK
|
|
if (c->lookup_type == 1) {
|
|
int div = 1;
|
|
for (i=0; i < effective; ++i) {
|
|
int off = (z / div) % c->lookup_values;
|
|
float val = CODEBOOK_ELEMENT_FAST(c,off) + last;
|
|
if (outputs[c_inter])
|
|
outputs[c_inter][p_inter] += val;
|
|
if (++c_inter == ch) { c_inter = 0; ++p_inter; }
|
|
if (c->sequence_p) last = val;
|
|
div *= c->lookup_values;
|
|
}
|
|
} else
|
|
#endif
|
|
{
|
|
z *= c->dimensions;
|
|
if (c->sequence_p) {
|
|
for (i=0; i < effective; ++i) {
|
|
float val = CODEBOOK_ELEMENT_FAST(c,z+i) + last;
|
|
if (outputs[c_inter])
|
|
outputs[c_inter][p_inter] += val;
|
|
if (++c_inter == ch) { c_inter = 0; ++p_inter; }
|
|
last = val;
|
|
}
|
|
} else {
|
|
for (i=0; i < effective; ++i) {
|
|
float val = CODEBOOK_ELEMENT_FAST(c,z+i) + last;
|
|
if (outputs[c_inter])
|
|
outputs[c_inter][p_inter] += val;
|
|
if (++c_inter == ch) { c_inter = 0; ++p_inter; }
|
|
}
|
|
}
|
|
}
|
|
|
|
total_decode -= effective;
|
|
}
|
|
*c_inter_p = c_inter;
|
|
*p_inter_p = p_inter;
|
|
return TRUE;
|
|
}
|
|
|
|
static int predict_point(int x, int x0, int x1, int y0, int y1)
|
|
{
|
|
int dy = y1 - y0;
|
|
int adx = x1 - x0;
|
|
// @OPTIMIZE: force int division to round in the right direction... is this necessary on x86?
|
|
int err = abs(dy) * (x - x0);
|
|
int off = err / adx;
|
|
return dy < 0 ? y0 - off : y0 + off;
|
|
}
|
|
|
|
// the following table is block-copied from the specification
|
|
static float inverse_db_table[256] =
|
|
{
|
|
1.0649863e-07f, 1.1341951e-07f, 1.2079015e-07f, 1.2863978e-07f,
|
|
1.3699951e-07f, 1.4590251e-07f, 1.5538408e-07f, 1.6548181e-07f,
|
|
1.7623575e-07f, 1.8768855e-07f, 1.9988561e-07f, 2.1287530e-07f,
|
|
2.2670913e-07f, 2.4144197e-07f, 2.5713223e-07f, 2.7384213e-07f,
|
|
2.9163793e-07f, 3.1059021e-07f, 3.3077411e-07f, 3.5226968e-07f,
|
|
3.7516214e-07f, 3.9954229e-07f, 4.2550680e-07f, 4.5315863e-07f,
|
|
4.8260743e-07f, 5.1396998e-07f, 5.4737065e-07f, 5.8294187e-07f,
|
|
6.2082472e-07f, 6.6116941e-07f, 7.0413592e-07f, 7.4989464e-07f,
|
|
7.9862701e-07f, 8.5052630e-07f, 9.0579828e-07f, 9.6466216e-07f,
|
|
1.0273513e-06f, 1.0941144e-06f, 1.1652161e-06f, 1.2409384e-06f,
|
|
1.3215816e-06f, 1.4074654e-06f, 1.4989305e-06f, 1.5963394e-06f,
|
|
1.7000785e-06f, 1.8105592e-06f, 1.9282195e-06f, 2.0535261e-06f,
|
|
2.1869758e-06f, 2.3290978e-06f, 2.4804557e-06f, 2.6416497e-06f,
|
|
2.8133190e-06f, 2.9961443e-06f, 3.1908506e-06f, 3.3982101e-06f,
|
|
3.6190449e-06f, 3.8542308e-06f, 4.1047004e-06f, 4.3714470e-06f,
|
|
4.6555282e-06f, 4.9580707e-06f, 5.2802740e-06f, 5.6234160e-06f,
|
|
5.9888572e-06f, 6.3780469e-06f, 6.7925283e-06f, 7.2339451e-06f,
|
|
7.7040476e-06f, 8.2047000e-06f, 8.7378876e-06f, 9.3057248e-06f,
|
|
9.9104632e-06f, 1.0554501e-05f, 1.1240392e-05f, 1.1970856e-05f,
|
|
1.2748789e-05f, 1.3577278e-05f, 1.4459606e-05f, 1.5399272e-05f,
|
|
1.6400004e-05f, 1.7465768e-05f, 1.8600792e-05f, 1.9809576e-05f,
|
|
2.1096914e-05f, 2.2467911e-05f, 2.3928002e-05f, 2.5482978e-05f,
|
|
2.7139006e-05f, 2.8902651e-05f, 3.0780908e-05f, 3.2781225e-05f,
|
|
3.4911534e-05f, 3.7180282e-05f, 3.9596466e-05f, 4.2169667e-05f,
|
|
4.4910090e-05f, 4.7828601e-05f, 5.0936773e-05f, 5.4246931e-05f,
|
|
5.7772202e-05f, 6.1526565e-05f, 6.5524908e-05f, 6.9783085e-05f,
|
|
7.4317983e-05f, 7.9147585e-05f, 8.4291040e-05f, 8.9768747e-05f,
|
|
9.5602426e-05f, 0.00010181521f, 0.00010843174f, 0.00011547824f,
|
|
0.00012298267f, 0.00013097477f, 0.00013948625f, 0.00014855085f,
|
|
0.00015820453f, 0.00016848555f, 0.00017943469f, 0.00019109536f,
|
|
0.00020351382f, 0.00021673929f, 0.00023082423f, 0.00024582449f,
|
|
0.00026179955f, 0.00027881276f, 0.00029693158f, 0.00031622787f,
|
|
0.00033677814f, 0.00035866388f, 0.00038197188f, 0.00040679456f,
|
|
0.00043323036f, 0.00046138411f, 0.00049136745f, 0.00052329927f,
|
|
0.00055730621f, 0.00059352311f, 0.00063209358f, 0.00067317058f,
|
|
0.00071691700f, 0.00076350630f, 0.00081312324f, 0.00086596457f,
|
|
0.00092223983f, 0.00098217216f, 0.0010459992f, 0.0011139742f,
|
|
0.0011863665f, 0.0012634633f, 0.0013455702f, 0.0014330129f,
|
|
0.0015261382f, 0.0016253153f, 0.0017309374f, 0.0018434235f,
|
|
0.0019632195f, 0.0020908006f, 0.0022266726f, 0.0023713743f,
|
|
0.0025254795f, 0.0026895994f, 0.0028643847f, 0.0030505286f,
|
|
0.0032487691f, 0.0034598925f, 0.0036847358f, 0.0039241906f,
|
|
0.0041792066f, 0.0044507950f, 0.0047400328f, 0.0050480668f,
|
|
0.0053761186f, 0.0057254891f, 0.0060975636f, 0.0064938176f,
|
|
0.0069158225f, 0.0073652516f, 0.0078438871f, 0.0083536271f,
|
|
0.0088964928f, 0.009474637f, 0.010090352f, 0.010746080f,
|
|
0.011444421f, 0.012188144f, 0.012980198f, 0.013823725f,
|
|
0.014722068f, 0.015678791f, 0.016697687f, 0.017782797f,
|
|
0.018938423f, 0.020169149f, 0.021479854f, 0.022875735f,
|
|
0.024362330f, 0.025945531f, 0.027631618f, 0.029427276f,
|
|
0.031339626f, 0.033376252f, 0.035545228f, 0.037855157f,
|
|
0.040315199f, 0.042935108f, 0.045725273f, 0.048696758f,
|
|
0.051861348f, 0.055231591f, 0.058820850f, 0.062643361f,
|
|
0.066714279f, 0.071049749f, 0.075666962f, 0.080584227f,
|
|
0.085821044f, 0.091398179f, 0.097337747f, 0.10366330f,
|
|
0.11039993f, 0.11757434f, 0.12521498f, 0.13335215f,
|
|
0.14201813f, 0.15124727f, 0.16107617f, 0.17154380f,
|
|
0.18269168f, 0.19456402f, 0.20720788f, 0.22067342f,
|
|
0.23501402f, 0.25028656f, 0.26655159f, 0.28387361f,
|
|
0.30232132f, 0.32196786f, 0.34289114f, 0.36517414f,
|
|
0.38890521f, 0.41417847f, 0.44109412f, 0.46975890f,
|
|
0.50028648f, 0.53279791f, 0.56742212f, 0.60429640f,
|
|
0.64356699f, 0.68538959f, 0.72993007f, 0.77736504f,
|
|
0.82788260f, 0.88168307f, 0.9389798f, 1.0f
|
|
};
|
|
|
|
|
|
// @OPTIMIZE: if you want to replace this bresenham line-drawing routine,
|
|
// note that you must produce bit-identical output to decode correctly;
|
|
// this specific sequence of operations is specified in the spec (it's
|
|
// drawing integer-quantized frequency-space lines that the encoder
|
|
// expects to be exactly the same)
|
|
// ... also, isn't the whole point of Bresenham's algorithm to NOT
|
|
// have to divide in the setup? sigh.
|
|
#ifndef STB_VORBIS_NO_DEFER_FLOOR
|
|
#define LINE_OP(a,b) a *= b
|
|
#else
|
|
#define LINE_OP(a,b) a = b
|
|
#endif
|
|
|
|
#ifdef STB_VORBIS_DIVIDE_TABLE
|
|
#define DIVTAB_NUMER 32
|
|
#define DIVTAB_DENOM 64
|
|
int8 integer_divide_table[DIVTAB_NUMER][DIVTAB_DENOM]; // 2KB
|
|
#endif
|
|
|
|
static __forceinline void draw_line(float *output, int x0, int y0, int x1, int y1, int n)
|
|
{
|
|
int dy = y1 - y0;
|
|
int adx = x1 - x0;
|
|
int ady = abs(dy);
|
|
int base;
|
|
int x=x0,y=y0;
|
|
int err = 0;
|
|
int sy;
|
|
|
|
#ifdef STB_VORBIS_DIVIDE_TABLE
|
|
if (adx < DIVTAB_DENOM && ady < DIVTAB_NUMER) {
|
|
if (dy < 0) {
|
|
base = -integer_divide_table[ady][adx];
|
|
sy = base-1;
|
|
} else {
|
|
base = integer_divide_table[ady][adx];
|
|
sy = base+1;
|
|
}
|
|
} else {
|
|
base = dy / adx;
|
|
if (dy < 0)
|
|
sy = base - 1;
|
|
else
|
|
sy = base+1;
|
|
}
|
|
#else
|
|
base = dy / adx;
|
|
if (dy < 0)
|
|
sy = base - 1;
|
|
else
|
|
sy = base+1;
|
|
#endif
|
|
ady -= abs(base) * adx;
|
|
if (x1 > n) x1 = n;
|
|
if (x < x1) {
|
|
LINE_OP(output[x], inverse_db_table[y&255]);
|
|
for (++x; x < x1; ++x) {
|
|
err += ady;
|
|
if (err >= adx) {
|
|
err -= adx;
|
|
y += sy;
|
|
} else
|
|
y += base;
|
|
LINE_OP(output[x], inverse_db_table[y&255]);
|
|
}
|
|
}
|
|
}
|
|
|
|
static int residue_decode(vorb *f, Codebook *book, float *target, int offset, int n, int rtype)
|
|
{
|
|
int k;
|
|
if (rtype == 0) {
|
|
int step = n / book->dimensions;
|
|
for (k=0; k < step; ++k)
|
|
if (!codebook_decode_step(f, book, target+offset+k, n-offset-k, step))
|
|
return FALSE;
|
|
} else {
|
|
for (k=0; k < n; ) {
|
|
if (!codebook_decode(f, book, target+offset, n-k))
|
|
return FALSE;
|
|
k += book->dimensions;
|
|
offset += book->dimensions;
|
|
}
|
|
}
|
|
return TRUE;
|
|
}
|
|
|
|
// n is 1/2 of the blocksize --
|
|
// specification: "Correct per-vector decode length is [n]/2"
|
|
static void decode_residue(vorb *f, float *residue_buffers[], int ch, int n, int rn, uint8 *do_not_decode)
|
|
{
|
|
int i,j,pass;
|
|
Residue *r = f->residue_config + rn;
|
|
int rtype = f->residue_types[rn];
|
|
int c = r->classbook;
|
|
int classwords = f->codebooks[c].dimensions;
|
|
unsigned int actual_size = rtype == 2 ? n*2 : n;
|
|
unsigned int limit_r_begin = (r->begin < actual_size ? r->begin : actual_size);
|
|
unsigned int limit_r_end = (r->end < actual_size ? r->end : actual_size);
|
|
int n_read = limit_r_end - limit_r_begin;
|
|
int part_read = n_read / r->part_size;
|
|
int temp_alloc_point = temp_alloc_save(f);
|
|
#ifndef STB_VORBIS_DIVIDES_IN_RESIDUE
|
|
uint8 ***part_classdata = (uint8 ***) temp_block_array(f,f->channels, part_read * sizeof(**part_classdata));
|
|
#else
|
|
int **classifications = (int **) temp_block_array(f,f->channels, part_read * sizeof(**classifications));
|
|
#endif
|
|
|
|
CHECK(f);
|
|
|
|
for (i=0; i < ch; ++i)
|
|
if (!do_not_decode[i])
|
|
memset(residue_buffers[i], 0, sizeof(float) * n);
|
|
|
|
if (rtype == 2 && ch != 1) {
|
|
for (j=0; j < ch; ++j)
|
|
if (!do_not_decode[j])
|
|
break;
|
|
if (j == ch)
|
|
goto done;
|
|
|
|
for (pass=0; pass < 8; ++pass) {
|
|
int pcount = 0, class_set = 0;
|
|
if (ch == 2) {
|
|
while (pcount < part_read) {
|
|
int z = r->begin + pcount*r->part_size;
|
|
int c_inter = (z & 1), p_inter = z>>1;
|
|
if (pass == 0) {
|
|
Codebook *c = f->codebooks+r->classbook;
|
|
int q;
|
|
DECODE(q,f,c);
|
|
if (q == EOP) goto done;
|
|
#ifndef STB_VORBIS_DIVIDES_IN_RESIDUE
|
|
part_classdata[0][class_set] = r->classdata[q];
|
|
#else
|
|
for (i=classwords-1; i >= 0; --i) {
|
|
classifications[0][i+pcount] = q % r->classifications;
|
|
q /= r->classifications;
|
|
}
|
|
#endif
|
|
}
|
|
for (i=0; i < classwords && pcount < part_read; ++i, ++pcount) {
|
|
int z = r->begin + pcount*r->part_size;
|
|
#ifndef STB_VORBIS_DIVIDES_IN_RESIDUE
|
|
int c = part_classdata[0][class_set][i];
|
|
#else
|
|
int c = classifications[0][pcount];
|
|
#endif
|
|
int b = r->residue_books[c][pass];
|
|
if (b >= 0) {
|
|
Codebook *book = f->codebooks + b;
|
|
#ifdef STB_VORBIS_DIVIDES_IN_CODEBOOK
|
|
if (!codebook_decode_deinterleave_repeat(f, book, residue_buffers, ch, &c_inter, &p_inter, n, r->part_size))
|
|
goto done;
|
|
#else
|
|
// saves 1%
|
|
if (!codebook_decode_deinterleave_repeat(f, book, residue_buffers, ch, &c_inter, &p_inter, n, r->part_size))
|
|
goto done;
|
|
#endif
|
|
} else {
|
|
z += r->part_size;
|
|
c_inter = z & 1;
|
|
p_inter = z >> 1;
|
|
}
|
|
}
|
|
#ifndef STB_VORBIS_DIVIDES_IN_RESIDUE
|
|
++class_set;
|
|
#endif
|
|
}
|
|
} else if (ch > 2) {
|
|
while (pcount < part_read) {
|
|
int z = r->begin + pcount*r->part_size;
|
|
int c_inter = z % ch, p_inter = z/ch;
|
|
if (pass == 0) {
|
|
Codebook *c = f->codebooks+r->classbook;
|
|
int q;
|
|
DECODE(q,f,c);
|
|
if (q == EOP) goto done;
|
|
#ifndef STB_VORBIS_DIVIDES_IN_RESIDUE
|
|
part_classdata[0][class_set] = r->classdata[q];
|
|
#else
|
|
for (i=classwords-1; i >= 0; --i) {
|
|
classifications[0][i+pcount] = q % r->classifications;
|
|
q /= r->classifications;
|
|
}
|
|
#endif
|
|
}
|
|
for (i=0; i < classwords && pcount < part_read; ++i, ++pcount) {
|
|
int z = r->begin + pcount*r->part_size;
|
|
#ifndef STB_VORBIS_DIVIDES_IN_RESIDUE
|
|
int c = part_classdata[0][class_set][i];
|
|
#else
|
|
int c = classifications[0][pcount];
|
|
#endif
|
|
int b = r->residue_books[c][pass];
|
|
if (b >= 0) {
|
|
Codebook *book = f->codebooks + b;
|
|
if (!codebook_decode_deinterleave_repeat(f, book, residue_buffers, ch, &c_inter, &p_inter, n, r->part_size))
|
|
goto done;
|
|
} else {
|
|
z += r->part_size;
|
|
c_inter = z % ch;
|
|
p_inter = z / ch;
|
|
}
|
|
}
|
|
#ifndef STB_VORBIS_DIVIDES_IN_RESIDUE
|
|
++class_set;
|
|
#endif
|
|
}
|
|
}
|
|
}
|
|
goto done;
|
|
}
|
|
CHECK(f);
|
|
|
|
for (pass=0; pass < 8; ++pass) {
|
|
int pcount = 0, class_set=0;
|
|
while (pcount < part_read) {
|
|
if (pass == 0) {
|
|
for (j=0; j < ch; ++j) {
|
|
if (!do_not_decode[j]) {
|
|
Codebook *c = f->codebooks+r->classbook;
|
|
int temp;
|
|
DECODE(temp,f,c);
|
|
if (temp == EOP) goto done;
|
|
#ifndef STB_VORBIS_DIVIDES_IN_RESIDUE
|
|
part_classdata[j][class_set] = r->classdata[temp];
|
|
#else
|
|
for (i=classwords-1; i >= 0; --i) {
|
|
classifications[j][i+pcount] = temp % r->classifications;
|
|
temp /= r->classifications;
|
|
}
|
|
#endif
|
|
}
|
|
}
|
|
}
|
|
for (i=0; i < classwords && pcount < part_read; ++i, ++pcount) {
|
|
for (j=0; j < ch; ++j) {
|
|
if (!do_not_decode[j]) {
|
|
#ifndef STB_VORBIS_DIVIDES_IN_RESIDUE
|
|
int c = part_classdata[j][class_set][i];
|
|
#else
|
|
int c = classifications[j][pcount];
|
|
#endif
|
|
int b = r->residue_books[c][pass];
|
|
if (b >= 0) {
|
|
float *target = residue_buffers[j];
|
|
int offset = r->begin + pcount * r->part_size;
|
|
int n = r->part_size;
|
|
Codebook *book = f->codebooks + b;
|
|
if (!residue_decode(f, book, target, offset, n, rtype))
|
|
goto done;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
#ifndef STB_VORBIS_DIVIDES_IN_RESIDUE
|
|
++class_set;
|
|
#endif
|
|
}
|
|
}
|
|
done:
|
|
CHECK(f);
|
|
#ifndef STB_VORBIS_DIVIDES_IN_RESIDUE
|
|
temp_free(f,part_classdata);
|
|
#else
|
|
temp_free(f,classifications);
|
|
#endif
|
|
temp_alloc_restore(f,temp_alloc_point);
|
|
}
|
|
|
|
|
|
#if 0
|
|
// slow way for debugging
|
|
void inverse_mdct_slow(float *buffer, int n)
|
|
{
|
|
int i,j;
|
|
int n2 = n >> 1;
|
|
float *x = (float *) malloc(sizeof(*x) * n2);
|
|
memcpy(x, buffer, sizeof(*x) * n2);
|
|
for (i=0; i < n; ++i) {
|
|
float acc = 0;
|
|
for (j=0; j < n2; ++j)
|
|
// formula from paper:
|
|
//acc += n/4.0f * x[j] * (float) cos(M_PI / 2 / n * (2 * i + 1 + n/2.0)*(2*j+1));
|
|
// formula from wikipedia
|
|
//acc += 2.0f / n2 * x[j] * (float) cos(M_PI/n2 * (i + 0.5 + n2/2)*(j + 0.5));
|
|
// these are equivalent, except the formula from the paper inverts the multiplier!
|
|
// however, what actually works is NO MULTIPLIER!?!
|
|
//acc += 64 * 2.0f / n2 * x[j] * (float) cos(M_PI/n2 * (i + 0.5 + n2/2)*(j + 0.5));
|
|
acc += x[j] * (float) cos(M_PI / 2 / n * (2 * i + 1 + n/2.0)*(2*j+1));
|
|
buffer[i] = acc;
|
|
}
|
|
free(x);
|
|
}
|
|
#elif 0
|
|
// same as above, but just barely able to run in real time on modern machines
|
|
void inverse_mdct_slow(float *buffer, int n, vorb *f, int blocktype)
|
|
{
|
|
float mcos[16384];
|
|
int i,j;
|
|
int n2 = n >> 1, nmask = (n << 2) -1;
|
|
float *x = (float *) malloc(sizeof(*x) * n2);
|
|
memcpy(x, buffer, sizeof(*x) * n2);
|
|
for (i=0; i < 4*n; ++i)
|
|
mcos[i] = (float) cos(M_PI / 2 * i / n);
|
|
|
|
for (i=0; i < n; ++i) {
|
|
float acc = 0;
|
|
for (j=0; j < n2; ++j)
|
|
acc += x[j] * mcos[(2 * i + 1 + n2)*(2*j+1) & nmask];
|
|
buffer[i] = acc;
|
|
}
|
|
free(x);
|
|
}
|
|
#elif 0
|
|
// transform to use a slow dct-iv; this is STILL basically trivial,
|
|
// but only requires half as many ops
|
|
void dct_iv_slow(float *buffer, int n)
|
|
{
|
|
float mcos[16384];
|
|
float x[2048];
|
|
int i,j;
|
|
int n2 = n >> 1, nmask = (n << 3) - 1;
|
|
memcpy(x, buffer, sizeof(*x) * n);
|
|
for (i=0; i < 8*n; ++i)
|
|
mcos[i] = (float) cos(M_PI / 4 * i / n);
|
|
for (i=0; i < n; ++i) {
|
|
float acc = 0;
|
|
for (j=0; j < n; ++j)
|
|
acc += x[j] * mcos[((2 * i + 1)*(2*j+1)) & nmask];
|
|
buffer[i] = acc;
|
|
}
|
|
}
|
|
|
|
void inverse_mdct_slow(float *buffer, int n, vorb *f, int blocktype)
|
|
{
|
|
int i, n4 = n >> 2, n2 = n >> 1, n3_4 = n - n4;
|
|
float temp[4096];
|
|
|
|
memcpy(temp, buffer, n2 * sizeof(float));
|
|
dct_iv_slow(temp, n2); // returns -c'-d, a-b'
|
|
|
|
for (i=0; i < n4 ; ++i) buffer[i] = temp[i+n4]; // a-b'
|
|
for ( ; i < n3_4; ++i) buffer[i] = -temp[n3_4 - i - 1]; // b-a', c+d'
|
|
for ( ; i < n ; ++i) buffer[i] = -temp[i - n3_4]; // c'+d
|
|
}
|
|
#endif
|
|
|
|
#ifndef LIBVORBIS_MDCT
|
|
#define LIBVORBIS_MDCT 0
|
|
#endif
|
|
|
|
#if LIBVORBIS_MDCT
|
|
// directly call the vorbis MDCT using an interface documented
|
|
// by Jeff Roberts... useful for performance comparison
|
|
typedef struct
|
|
{
|
|
int n;
|
|
int log2n;
|
|
|
|
float *trig;
|
|
int *bitrev;
|
|
|
|
float scale;
|
|
} mdct_lookup;
|
|
|
|
extern void mdct_init(mdct_lookup *lookup, int n);
|
|
extern void mdct_clear(mdct_lookup *l);
|
|
extern void mdct_backward(mdct_lookup *init, float *in, float *out);
|
|
|
|
mdct_lookup M1,M2;
|
|
|
|
void inverse_mdct(float *buffer, int n, vorb *f, int blocktype)
|
|
{
|
|
mdct_lookup *M;
|
|
if (M1.n == n) M = &M1;
|
|
else if (M2.n == n) M = &M2;
|
|
else if (M1.n == 0) { mdct_init(&M1, n); M = &M1; }
|
|
else {
|
|
if (M2.n) __asm int 3;
|
|
mdct_init(&M2, n);
|
|
M = &M2;
|
|
}
|
|
|
|
mdct_backward(M, buffer, buffer);
|
|
}
|
|
#endif
|
|
|
|
|
|
// the following were split out into separate functions while optimizing;
|
|
// they could be pushed back up but eh. __forceinline showed no change;
|
|
// they're probably already being inlined.
|
|
static void imdct_step3_iter0_loop(int n, float *e, int i_off, int k_off, float *A)
|
|
{
|
|
float *ee0 = e + i_off;
|
|
float *ee2 = ee0 + k_off;
|
|
int i;
|
|
|
|
assert((n & 3) == 0);
|
|
for (i=(n>>2); i > 0; --i) {
|
|
float k00_20, k01_21;
|
|
k00_20 = ee0[ 0] - ee2[ 0];
|
|
k01_21 = ee0[-1] - ee2[-1];
|
|
ee0[ 0] += ee2[ 0];//ee0[ 0] = ee0[ 0] + ee2[ 0];
|
|
ee0[-1] += ee2[-1];//ee0[-1] = ee0[-1] + ee2[-1];
|
|
ee2[ 0] = k00_20 * A[0] - k01_21 * A[1];
|
|
ee2[-1] = k01_21 * A[0] + k00_20 * A[1];
|
|
A += 8;
|
|
|
|
k00_20 = ee0[-2] - ee2[-2];
|
|
k01_21 = ee0[-3] - ee2[-3];
|
|
ee0[-2] += ee2[-2];//ee0[-2] = ee0[-2] + ee2[-2];
|
|
ee0[-3] += ee2[-3];//ee0[-3] = ee0[-3] + ee2[-3];
|
|
ee2[-2] = k00_20 * A[0] - k01_21 * A[1];
|
|
ee2[-3] = k01_21 * A[0] + k00_20 * A[1];
|
|
A += 8;
|
|
|
|
k00_20 = ee0[-4] - ee2[-4];
|
|
k01_21 = ee0[-5] - ee2[-5];
|
|
ee0[-4] += ee2[-4];//ee0[-4] = ee0[-4] + ee2[-4];
|
|
ee0[-5] += ee2[-5];//ee0[-5] = ee0[-5] + ee2[-5];
|
|
ee2[-4] = k00_20 * A[0] - k01_21 * A[1];
|
|
ee2[-5] = k01_21 * A[0] + k00_20 * A[1];
|
|
A += 8;
|
|
|
|
k00_20 = ee0[-6] - ee2[-6];
|
|
k01_21 = ee0[-7] - ee2[-7];
|
|
ee0[-6] += ee2[-6];//ee0[-6] = ee0[-6] + ee2[-6];
|
|
ee0[-7] += ee2[-7];//ee0[-7] = ee0[-7] + ee2[-7];
|
|
ee2[-6] = k00_20 * A[0] - k01_21 * A[1];
|
|
ee2[-7] = k01_21 * A[0] + k00_20 * A[1];
|
|
A += 8;
|
|
ee0 -= 8;
|
|
ee2 -= 8;
|
|
}
|
|
}
|
|
|
|
static void imdct_step3_inner_r_loop(int lim, float *e, int d0, int k_off, float *A, int k1)
|
|
{
|
|
int i;
|
|
float k00_20, k01_21;
|
|
|
|
float *e0 = e + d0;
|
|
float *e2 = e0 + k_off;
|
|
|
|
for (i=lim >> 2; i > 0; --i) {
|
|
k00_20 = e0[-0] - e2[-0];
|
|
k01_21 = e0[-1] - e2[-1];
|
|
e0[-0] += e2[-0];//e0[-0] = e0[-0] + e2[-0];
|
|
e0[-1] += e2[-1];//e0[-1] = e0[-1] + e2[-1];
|
|
e2[-0] = (k00_20)*A[0] - (k01_21) * A[1];
|
|
e2[-1] = (k01_21)*A[0] + (k00_20) * A[1];
|
|
|
|
A += k1;
|
|
|
|
k00_20 = e0[-2] - e2[-2];
|
|
k01_21 = e0[-3] - e2[-3];
|
|
e0[-2] += e2[-2];//e0[-2] = e0[-2] + e2[-2];
|
|
e0[-3] += e2[-3];//e0[-3] = e0[-3] + e2[-3];
|
|
e2[-2] = (k00_20)*A[0] - (k01_21) * A[1];
|
|
e2[-3] = (k01_21)*A[0] + (k00_20) * A[1];
|
|
|
|
A += k1;
|
|
|
|
k00_20 = e0[-4] - e2[-4];
|
|
k01_21 = e0[-5] - e2[-5];
|
|
e0[-4] += e2[-4];//e0[-4] = e0[-4] + e2[-4];
|
|
e0[-5] += e2[-5];//e0[-5] = e0[-5] + e2[-5];
|
|
e2[-4] = (k00_20)*A[0] - (k01_21) * A[1];
|
|
e2[-5] = (k01_21)*A[0] + (k00_20) * A[1];
|
|
|
|
A += k1;
|
|
|
|
k00_20 = e0[-6] - e2[-6];
|
|
k01_21 = e0[-7] - e2[-7];
|
|
e0[-6] += e2[-6];//e0[-6] = e0[-6] + e2[-6];
|
|
e0[-7] += e2[-7];//e0[-7] = e0[-7] + e2[-7];
|
|
e2[-6] = (k00_20)*A[0] - (k01_21) * A[1];
|
|
e2[-7] = (k01_21)*A[0] + (k00_20) * A[1];
|
|
|
|
e0 -= 8;
|
|
e2 -= 8;
|
|
|
|
A += k1;
|
|
}
|
|
}
|
|
|
|
static void imdct_step3_inner_s_loop(int n, float *e, int i_off, int k_off, float *A, int a_off, int k0)
|
|
{
|
|
int i;
|
|
float A0 = A[0];
|
|
float A1 = A[0+1];
|
|
float A2 = A[0+a_off];
|
|
float A3 = A[0+a_off+1];
|
|
float A4 = A[0+a_off*2+0];
|
|
float A5 = A[0+a_off*2+1];
|
|
float A6 = A[0+a_off*3+0];
|
|
float A7 = A[0+a_off*3+1];
|
|
|
|
float k00,k11;
|
|
|
|
float *ee0 = e +i_off;
|
|
float *ee2 = ee0+k_off;
|
|
|
|
for (i=n; i > 0; --i) {
|
|
k00 = ee0[ 0] - ee2[ 0];
|
|
k11 = ee0[-1] - ee2[-1];
|
|
ee0[ 0] = ee0[ 0] + ee2[ 0];
|
|
ee0[-1] = ee0[-1] + ee2[-1];
|
|
ee2[ 0] = (k00) * A0 - (k11) * A1;
|
|
ee2[-1] = (k11) * A0 + (k00) * A1;
|
|
|
|
k00 = ee0[-2] - ee2[-2];
|
|
k11 = ee0[-3] - ee2[-3];
|
|
ee0[-2] = ee0[-2] + ee2[-2];
|
|
ee0[-3] = ee0[-3] + ee2[-3];
|
|
ee2[-2] = (k00) * A2 - (k11) * A3;
|
|
ee2[-3] = (k11) * A2 + (k00) * A3;
|
|
|
|
k00 = ee0[-4] - ee2[-4];
|
|
k11 = ee0[-5] - ee2[-5];
|
|
ee0[-4] = ee0[-4] + ee2[-4];
|
|
ee0[-5] = ee0[-5] + ee2[-5];
|
|
ee2[-4] = (k00) * A4 - (k11) * A5;
|
|
ee2[-5] = (k11) * A4 + (k00) * A5;
|
|
|
|
k00 = ee0[-6] - ee2[-6];
|
|
k11 = ee0[-7] - ee2[-7];
|
|
ee0[-6] = ee0[-6] + ee2[-6];
|
|
ee0[-7] = ee0[-7] + ee2[-7];
|
|
ee2[-6] = (k00) * A6 - (k11) * A7;
|
|
ee2[-7] = (k11) * A6 + (k00) * A7;
|
|
|
|
ee0 -= k0;
|
|
ee2 -= k0;
|
|
}
|
|
}
|
|
|
|
static __forceinline void iter_54(float *z)
|
|
{
|
|
float k00,k11,k22,k33;
|
|
float y0,y1,y2,y3;
|
|
|
|
k00 = z[ 0] - z[-4];
|
|
y0 = z[ 0] + z[-4];
|
|
y2 = z[-2] + z[-6];
|
|
k22 = z[-2] - z[-6];
|
|
|
|
z[-0] = y0 + y2; // z0 + z4 + z2 + z6
|
|
z[-2] = y0 - y2; // z0 + z4 - z2 - z6
|
|
|
|
// done with y0,y2
|
|
|
|
k33 = z[-3] - z[-7];
|
|
|
|
z[-4] = k00 + k33; // z0 - z4 + z3 - z7
|
|
z[-6] = k00 - k33; // z0 - z4 - z3 + z7
|
|
|
|
// done with k33
|
|
|
|
k11 = z[-1] - z[-5];
|
|
y1 = z[-1] + z[-5];
|
|
y3 = z[-3] + z[-7];
|
|
|
|
z[-1] = y1 + y3; // z1 + z5 + z3 + z7
|
|
z[-3] = y1 - y3; // z1 + z5 - z3 - z7
|
|
z[-5] = k11 - k22; // z1 - z5 + z2 - z6
|
|
z[-7] = k11 + k22; // z1 - z5 - z2 + z6
|
|
}
|
|
|
|
static void imdct_step3_inner_s_loop_ld654(int n, float *e, int i_off, float *A, int base_n)
|
|
{
|
|
int a_off = base_n >> 3;
|
|
float A2 = A[0+a_off];
|
|
float *z = e + i_off;
|
|
float *base = z - 16 * n;
|
|
|
|
while (z > base) {
|
|
float k00,k11;
|
|
|
|
k00 = z[-0] - z[-8];
|
|
k11 = z[-1] - z[-9];
|
|
z[-0] = z[-0] + z[-8];
|
|
z[-1] = z[-1] + z[-9];
|
|
z[-8] = k00;
|
|
z[-9] = k11 ;
|
|
|
|
k00 = z[ -2] - z[-10];
|
|
k11 = z[ -3] - z[-11];
|
|
z[ -2] = z[ -2] + z[-10];
|
|
z[ -3] = z[ -3] + z[-11];
|
|
z[-10] = (k00+k11) * A2;
|
|
z[-11] = (k11-k00) * A2;
|
|
|
|
k00 = z[-12] - z[ -4]; // reverse to avoid a unary negation
|
|
k11 = z[ -5] - z[-13];
|
|
z[ -4] = z[ -4] + z[-12];
|
|
z[ -5] = z[ -5] + z[-13];
|
|
z[-12] = k11;
|
|
z[-13] = k00;
|
|
|
|
k00 = z[-14] - z[ -6]; // reverse to avoid a unary negation
|
|
k11 = z[ -7] - z[-15];
|
|
z[ -6] = z[ -6] + z[-14];
|
|
z[ -7] = z[ -7] + z[-15];
|
|
z[-14] = (k00+k11) * A2;
|
|
z[-15] = (k00-k11) * A2;
|
|
|
|
iter_54(z);
|
|
iter_54(z-8);
|
|
z -= 16;
|
|
}
|
|
}
|
|
|
|
static void inverse_mdct(float *buffer, int n, vorb *f, int blocktype)
|
|
{
|
|
int n2 = n >> 1, n4 = n >> 2, n8 = n >> 3, l;
|
|
int ld;
|
|
// @OPTIMIZE: reduce register pressure by using fewer variables?
|
|
int save_point = temp_alloc_save(f);
|
|
float *buf2 = (float *) temp_alloc(f, n2 * sizeof(*buf2));
|
|
float *u=NULL,*v=NULL;
|
|
// twiddle factors
|
|
float *A = f->A[blocktype];
|
|
|
|
// IMDCT algorithm from "The use of multirate filter banks for coding of high quality digital audio"
|
|
// See notes about bugs in that paper in less-optimal implementation 'inverse_mdct_old' after this function.
|
|
|
|
// kernel from paper
|
|
|
|
|
|
// merged:
|
|
// copy and reflect spectral data
|
|
// step 0
|
|
|
|
// note that it turns out that the items added together during
|
|
// this step are, in fact, being added to themselves (as reflected
|
|
// by step 0). inexplicable inefficiency! this became obvious
|
|
// once I combined the passes.
|
|
|
|
// so there's a missing 'times 2' here (for adding X to itself).
|
|
// this propagates through linearly to the end, where the numbers
|
|
// are 1/2 too small, and need to be compensated for.
|
|
|
|
{
|
|
float *d,*e, *AA, *e_stop;
|
|
d = &buf2[n2-2];
|
|
AA = A;
|
|
e = &buffer[0];
|
|
e_stop = &buffer[n2];
|
|
while (e != e_stop) {
|
|
d[1] = (e[0] * AA[0] - e[2]*AA[1]);
|
|
d[0] = (e[0] * AA[1] + e[2]*AA[0]);
|
|
d -= 2;
|
|
AA += 2;
|
|
e += 4;
|
|
}
|
|
|
|
e = &buffer[n2-3];
|
|
while (d >= buf2) {
|
|
d[1] = (-e[2] * AA[0] - -e[0]*AA[1]);
|
|
d[0] = (-e[2] * AA[1] + -e[0]*AA[0]);
|
|
d -= 2;
|
|
AA += 2;
|
|
e -= 4;
|
|
}
|
|
}
|
|
|
|
// now we use symbolic names for these, so that we can
|
|
// possibly swap their meaning as we change which operations
|
|
// are in place
|
|
|
|
u = buffer;
|
|
v = buf2;
|
|
|
|
// step 2 (paper output is w, now u)
|
|
// this could be in place, but the data ends up in the wrong
|
|
// place... _somebody_'s got to swap it, so this is nominated
|
|
{
|
|
float *AA = &A[n2-8];
|
|
float *d0,*d1, *e0, *e1;
|
|
|
|
e0 = &v[n4];
|
|
e1 = &v[0];
|
|
|
|
d0 = &u[n4];
|
|
d1 = &u[0];
|
|
|
|
while (AA >= A) {
|
|
float v40_20, v41_21;
|
|
|
|
v41_21 = e0[1] - e1[1];
|
|
v40_20 = e0[0] - e1[0];
|
|
d0[1] = e0[1] + e1[1];
|
|
d0[0] = e0[0] + e1[0];
|
|
d1[1] = v41_21*AA[4] - v40_20*AA[5];
|
|
d1[0] = v40_20*AA[4] + v41_21*AA[5];
|
|
|
|
v41_21 = e0[3] - e1[3];
|
|
v40_20 = e0[2] - e1[2];
|
|
d0[3] = e0[3] + e1[3];
|
|
d0[2] = e0[2] + e1[2];
|
|
d1[3] = v41_21*AA[0] - v40_20*AA[1];
|
|
d1[2] = v40_20*AA[0] + v41_21*AA[1];
|
|
|
|
AA -= 8;
|
|
|
|
d0 += 4;
|
|
d1 += 4;
|
|
e0 += 4;
|
|
e1 += 4;
|
|
}
|
|
}
|
|
|
|
// step 3
|
|
ld = ilog(n) - 1; // ilog is off-by-one from normal definitions
|
|
|
|
// optimized step 3:
|
|
|
|
// the original step3 loop can be nested r inside s or s inside r;
|
|
// it's written originally as s inside r, but this is dumb when r
|
|
// iterates many times, and s few. So I have two copies of it and
|
|
// switch between them halfway.
|
|
|
|
// this is iteration 0 of step 3
|
|
imdct_step3_iter0_loop(n >> 4, u, n2-1-n4*0, -(n >> 3), A);
|
|
imdct_step3_iter0_loop(n >> 4, u, n2-1-n4*1, -(n >> 3), A);
|
|
|
|
// this is iteration 1 of step 3
|
|
imdct_step3_inner_r_loop(n >> 5, u, n2-1 - n8*0, -(n >> 4), A, 16);
|
|
imdct_step3_inner_r_loop(n >> 5, u, n2-1 - n8*1, -(n >> 4), A, 16);
|
|
imdct_step3_inner_r_loop(n >> 5, u, n2-1 - n8*2, -(n >> 4), A, 16);
|
|
imdct_step3_inner_r_loop(n >> 5, u, n2-1 - n8*3, -(n >> 4), A, 16);
|
|
|
|
l=2;
|
|
for (; l < (ld-3)>>1; ++l) {
|
|
int k0 = n >> (l+2), k0_2 = k0>>1;
|
|
int lim = 1 << (l+1);
|
|
int i;
|
|
for (i=0; i < lim; ++i)
|
|
imdct_step3_inner_r_loop(n >> (l+4), u, n2-1 - k0*i, -k0_2, A, 1 << (l+3));
|
|
}
|
|
|
|
for (; l < ld-6; ++l) {
|
|
int k0 = n >> (l+2), k1 = 1 << (l+3), k0_2 = k0>>1;
|
|
int rlim = n >> (l+6), r;
|
|
int lim = 1 << (l+1);
|
|
int i_off;
|
|
float *A0 = A;
|
|
i_off = n2-1;
|
|
for (r=rlim; r > 0; --r) {
|
|
imdct_step3_inner_s_loop(lim, u, i_off, -k0_2, A0, k1, k0);
|
|
A0 += k1*4;
|
|
i_off -= 8;
|
|
}
|
|
}
|
|
|
|
// iterations with count:
|
|
// ld-6,-5,-4 all interleaved together
|
|
// the big win comes from getting rid of needless flops
|
|
// due to the constants on pass 5 & 4 being all 1 and 0;
|
|
// combining them to be simultaneous to improve cache made little difference
|
|
imdct_step3_inner_s_loop_ld654(n >> 5, u, n2-1, A, n);
|
|
|
|
// output is u
|
|
|
|
// step 4, 5, and 6
|
|
// cannot be in-place because of step 5
|
|
{
|
|
uint16 *bitrev = f->bit_reverse[blocktype];
|
|
// weirdly, I'd have thought reading sequentially and writing
|
|
// erratically would have been better than vice-versa, but in
|
|
// fact that's not what my testing showed. (That is, with
|
|
// j = bitreverse(i), do you read i and write j, or read j and write i.)
|
|
|
|
float *d0 = &v[n4-4];
|
|
float *d1 = &v[n2-4];
|
|
while (d0 >= v) {
|
|
int k4;
|
|
|
|
k4 = bitrev[0];
|
|
d1[3] = u[k4+0];
|
|
d1[2] = u[k4+1];
|
|
d0[3] = u[k4+2];
|
|
d0[2] = u[k4+3];
|
|
|
|
k4 = bitrev[1];
|
|
d1[1] = u[k4+0];
|
|
d1[0] = u[k4+1];
|
|
d0[1] = u[k4+2];
|
|
d0[0] = u[k4+3];
|
|
|
|
d0 -= 4;
|
|
d1 -= 4;
|
|
bitrev += 2;
|
|
}
|
|
}
|
|
// (paper output is u, now v)
|
|
|
|
|
|
// data must be in buf2
|
|
assert(v == buf2);
|
|
|
|
// step 7 (paper output is v, now v)
|
|
// this is now in place
|
|
{
|
|
float *C = f->C[blocktype];
|
|
float *d, *e;
|
|
|
|
d = v;
|
|
e = v + n2 - 4;
|
|
|
|
while (d < e) {
|
|
float a02,a11,b0,b1,b2,b3;
|
|
|
|
a02 = d[0] - e[2];
|
|
a11 = d[1] + e[3];
|
|
|
|
b0 = C[1]*a02 + C[0]*a11;
|
|
b1 = C[1]*a11 - C[0]*a02;
|
|
|
|
b2 = d[0] + e[ 2];
|
|
b3 = d[1] - e[ 3];
|
|
|
|
d[0] = b2 + b0;
|
|
d[1] = b3 + b1;
|
|
e[2] = b2 - b0;
|
|
e[3] = b1 - b3;
|
|
|
|
a02 = d[2] - e[0];
|
|
a11 = d[3] + e[1];
|
|
|
|
b0 = C[3]*a02 + C[2]*a11;
|
|
b1 = C[3]*a11 - C[2]*a02;
|
|
|
|
b2 = d[2] + e[ 0];
|
|
b3 = d[3] - e[ 1];
|
|
|
|
d[2] = b2 + b0;
|
|
d[3] = b3 + b1;
|
|
e[0] = b2 - b0;
|
|
e[1] = b1 - b3;
|
|
|
|
C += 4;
|
|
d += 4;
|
|
e -= 4;
|
|
}
|
|
}
|
|
|
|
// data must be in buf2
|
|
|
|
|
|
// step 8+decode (paper output is X, now buffer)
|
|
// this generates pairs of data a la 8 and pushes them directly through
|
|
// the decode kernel (pushing rather than pulling) to avoid having
|
|
// to make another pass later
|
|
|
|
// this cannot POSSIBLY be in place, so we refer to the buffers directly
|
|
|
|
{
|
|
float *d0,*d1,*d2,*d3;
|
|
|
|
float *B = f->B[blocktype] + n2 - 8;
|
|
float *e = buf2 + n2 - 8;
|
|
d0 = &buffer[0];
|
|
d1 = &buffer[n2-4];
|
|
d2 = &buffer[n2];
|
|
d3 = &buffer[n-4];
|
|
while (e >= v) {
|
|
float p0,p1,p2,p3;
|
|
|
|
p3 = e[6]*B[7] - e[7]*B[6];
|
|
p2 = -e[6]*B[6] - e[7]*B[7];
|
|
|
|
d0[0] = p3;
|
|
d1[3] = - p3;
|
|
d2[0] = p2;
|
|
d3[3] = p2;
|
|
|
|
p1 = e[4]*B[5] - e[5]*B[4];
|
|
p0 = -e[4]*B[4] - e[5]*B[5];
|
|
|
|
d0[1] = p1;
|
|
d1[2] = - p1;
|
|
d2[1] = p0;
|
|
d3[2] = p0;
|
|
|
|
p3 = e[2]*B[3] - e[3]*B[2];
|
|
p2 = -e[2]*B[2] - e[3]*B[3];
|
|
|
|
d0[2] = p3;
|
|
d1[1] = - p3;
|
|
d2[2] = p2;
|
|
d3[1] = p2;
|
|
|
|
p1 = e[0]*B[1] - e[1]*B[0];
|
|
p0 = -e[0]*B[0] - e[1]*B[1];
|
|
|
|
d0[3] = p1;
|
|
d1[0] = - p1;
|
|
d2[3] = p0;
|
|
d3[0] = p0;
|
|
|
|
B -= 8;
|
|
e -= 8;
|
|
d0 += 4;
|
|
d2 += 4;
|
|
d1 -= 4;
|
|
d3 -= 4;
|
|
}
|
|
}
|
|
|
|
temp_free(f,buf2);
|
|
temp_alloc_restore(f,save_point);
|
|
}
|
|
|
|
#if 0
|
|
// this is the original version of the above code, if you want to optimize it from scratch
|
|
void inverse_mdct_naive(float *buffer, int n)
|
|
{
|
|
float s;
|
|
float A[1 << 12], B[1 << 12], C[1 << 11];
|
|
int i,k,k2,k4, n2 = n >> 1, n4 = n >> 2, n8 = n >> 3, l;
|
|
int n3_4 = n - n4, ld;
|
|
// how can they claim this only uses N words?!
|
|
// oh, because they're only used sparsely, whoops
|
|
float u[1 << 13], X[1 << 13], v[1 << 13], w[1 << 13];
|
|
// set up twiddle factors
|
|
|
|
for (k=k2=0; k < n4; ++k,k2+=2) {
|
|
A[k2 ] = (float) cos(4*k*M_PI/n);
|
|
A[k2+1] = (float) -sin(4*k*M_PI/n);
|
|
B[k2 ] = (float) cos((k2+1)*M_PI/n/2);
|
|
B[k2+1] = (float) sin((k2+1)*M_PI/n/2);
|
|
}
|
|
for (k=k2=0; k < n8; ++k,k2+=2) {
|
|
C[k2 ] = (float) cos(2*(k2+1)*M_PI/n);
|
|
C[k2+1] = (float) -sin(2*(k2+1)*M_PI/n);
|
|
}
|
|
|
|
// IMDCT algorithm from "The use of multirate filter banks for coding of high quality digital audio"
|
|
// Note there are bugs in that pseudocode, presumably due to them attempting
|
|
// to rename the arrays nicely rather than representing the way their actual
|
|
// implementation bounces buffers back and forth. As a result, even in the
|
|
// "some formulars corrected" version, a direct implementation fails. These
|
|
// are noted below as "paper bug".
|
|
|
|
// copy and reflect spectral data
|
|
for (k=0; k < n2; ++k) u[k] = buffer[k];
|
|
for ( ; k < n ; ++k) u[k] = -buffer[n - k - 1];
|
|
// kernel from paper
|
|
// step 1
|
|
for (k=k2=k4=0; k < n4; k+=1, k2+=2, k4+=4) {
|
|
v[n-k4-1] = (u[k4] - u[n-k4-1]) * A[k2] - (u[k4+2] - u[n-k4-3])*A[k2+1];
|
|
v[n-k4-3] = (u[k4] - u[n-k4-1]) * A[k2+1] + (u[k4+2] - u[n-k4-3])*A[k2];
|
|
}
|
|
// step 2
|
|
for (k=k4=0; k < n8; k+=1, k4+=4) {
|
|
w[n2+3+k4] = v[n2+3+k4] + v[k4+3];
|
|
w[n2+1+k4] = v[n2+1+k4] + v[k4+1];
|
|
w[k4+3] = (v[n2+3+k4] - v[k4+3])*A[n2-4-k4] - (v[n2+1+k4]-v[k4+1])*A[n2-3-k4];
|
|
w[k4+1] = (v[n2+1+k4] - v[k4+1])*A[n2-4-k4] + (v[n2+3+k4]-v[k4+3])*A[n2-3-k4];
|
|
}
|
|
// step 3
|
|
ld = ilog(n) - 1; // ilog is off-by-one from normal definitions
|
|
for (l=0; l < ld-3; ++l) {
|
|
int k0 = n >> (l+2), k1 = 1 << (l+3);
|
|
int rlim = n >> (l+4), r4, r;
|
|
int s2lim = 1 << (l+2), s2;
|
|
for (r=r4=0; r < rlim; r4+=4,++r) {
|
|
for (s2=0; s2 < s2lim; s2+=2) {
|
|
u[n-1-k0*s2-r4] = w[n-1-k0*s2-r4] + w[n-1-k0*(s2+1)-r4];
|
|
u[n-3-k0*s2-r4] = w[n-3-k0*s2-r4] + w[n-3-k0*(s2+1)-r4];
|
|
u[n-1-k0*(s2+1)-r4] = (w[n-1-k0*s2-r4] - w[n-1-k0*(s2+1)-r4]) * A[r*k1]
|
|
- (w[n-3-k0*s2-r4] - w[n-3-k0*(s2+1)-r4]) * A[r*k1+1];
|
|
u[n-3-k0*(s2+1)-r4] = (w[n-3-k0*s2-r4] - w[n-3-k0*(s2+1)-r4]) * A[r*k1]
|
|
+ (w[n-1-k0*s2-r4] - w[n-1-k0*(s2+1)-r4]) * A[r*k1+1];
|
|
}
|
|
}
|
|
if (l+1 < ld-3) {
|
|
// paper bug: ping-ponging of u&w here is omitted
|
|
memcpy(w, u, sizeof(u));
|
|
}
|
|
}
|
|
|
|
// step 4
|
|
for (i=0; i < n8; ++i) {
|
|
int j = bit_reverse(i) >> (32-ld+3);
|
|
assert(j < n8);
|
|
if (i == j) {
|
|
// paper bug: original code probably swapped in place; if copying,
|
|
// need to directly copy in this case
|
|
int i8 = i << 3;
|
|
v[i8+1] = u[i8+1];
|
|
v[i8+3] = u[i8+3];
|
|
v[i8+5] = u[i8+5];
|
|
v[i8+7] = u[i8+7];
|
|
} else if (i < j) {
|
|
int i8 = i << 3, j8 = j << 3;
|
|
v[j8+1] = u[i8+1], v[i8+1] = u[j8 + 1];
|
|
v[j8+3] = u[i8+3], v[i8+3] = u[j8 + 3];
|
|
v[j8+5] = u[i8+5], v[i8+5] = u[j8 + 5];
|
|
v[j8+7] = u[i8+7], v[i8+7] = u[j8 + 7];
|
|
}
|
|
}
|
|
// step 5
|
|
for (k=0; k < n2; ++k) {
|
|
w[k] = v[k*2+1];
|
|
}
|
|
// step 6
|
|
for (k=k2=k4=0; k < n8; ++k, k2 += 2, k4 += 4) {
|
|
u[n-1-k2] = w[k4];
|
|
u[n-2-k2] = w[k4+1];
|
|
u[n3_4 - 1 - k2] = w[k4+2];
|
|
u[n3_4 - 2 - k2] = w[k4+3];
|
|
}
|
|
// step 7
|
|
for (k=k2=0; k < n8; ++k, k2 += 2) {
|
|
v[n2 + k2 ] = ( u[n2 + k2] + u[n-2-k2] + C[k2+1]*(u[n2+k2]-u[n-2-k2]) + C[k2]*(u[n2+k2+1]+u[n-2-k2+1]))/2;
|
|
v[n-2 - k2] = ( u[n2 + k2] + u[n-2-k2] - C[k2+1]*(u[n2+k2]-u[n-2-k2]) - C[k2]*(u[n2+k2+1]+u[n-2-k2+1]))/2;
|
|
v[n2+1+ k2] = ( u[n2+1+k2] - u[n-1-k2] + C[k2+1]*(u[n2+1+k2]+u[n-1-k2]) - C[k2]*(u[n2+k2]-u[n-2-k2]))/2;
|
|
v[n-1 - k2] = (-u[n2+1+k2] + u[n-1-k2] + C[k2+1]*(u[n2+1+k2]+u[n-1-k2]) - C[k2]*(u[n2+k2]-u[n-2-k2]))/2;
|
|
}
|
|
// step 8
|
|
for (k=k2=0; k < n4; ++k,k2 += 2) {
|
|
X[k] = v[k2+n2]*B[k2 ] + v[k2+1+n2]*B[k2+1];
|
|
X[n2-1-k] = v[k2+n2]*B[k2+1] - v[k2+1+n2]*B[k2 ];
|
|
}
|
|
|
|
// decode kernel to output
|
|
// determined the following value experimentally
|
|
// (by first figuring out what made inverse_mdct_slow work); then matching that here
|
|
// (probably vorbis encoder premultiplies by n or n/2, to save it on the decoder?)
|
|
s = 0.5; // theoretically would be n4
|
|
|
|
// [[[ note! the s value of 0.5 is compensated for by the B[] in the current code,
|
|
// so it needs to use the "old" B values to behave correctly, or else
|
|
// set s to 1.0 ]]]
|
|
for (i=0; i < n4 ; ++i) buffer[i] = s * X[i+n4];
|
|
for ( ; i < n3_4; ++i) buffer[i] = -s * X[n3_4 - i - 1];
|
|
for ( ; i < n ; ++i) buffer[i] = -s * X[i - n3_4];
|
|
}
|
|
#endif
|
|
|
|
static float *get_window(vorb *f, int len)
|
|
{
|
|
len <<= 1;
|
|
if (len == f->blocksize_0) return f->window[0];
|
|
if (len == f->blocksize_1) return f->window[1];
|
|
return NULL;
|
|
}
|
|
|
|
#ifndef STB_VORBIS_NO_DEFER_FLOOR
|
|
typedef int16 YTYPE;
|
|
#else
|
|
typedef int YTYPE;
|
|
#endif
|
|
static int do_floor(vorb *f, Mapping *map, int i, int n, float *target, YTYPE *finalY, uint8 *step2_flag)
|
|
{
|
|
int n2 = n >> 1;
|
|
int s = map->chan[i].mux, floor;
|
|
floor = map->submap_floor[s];
|
|
if (f->floor_types[floor] == 0) {
|
|
return error(f, VORBIS_invalid_stream);
|
|
} else {
|
|
Floor1 *g = &f->floor_config[floor].floor1;
|
|
int j,q;
|
|
int lx = 0, ly = finalY[0] * g->floor1_multiplier;
|
|
for (q=1; q < g->values; ++q) {
|
|
j = g->sorted_order[q];
|
|
#ifndef STB_VORBIS_NO_DEFER_FLOOR
|
|
if (finalY[j] >= 0)
|
|
#else
|
|
if (step2_flag[j])
|
|
#endif
|
|
{
|
|
int hy = finalY[j] * g->floor1_multiplier;
|
|
int hx = g->Xlist[j];
|
|
if (lx != hx)
|
|
draw_line(target, lx,ly, hx,hy, n2);
|
|
CHECK(f);
|
|
lx = hx, ly = hy;
|
|
}
|
|
}
|
|
if (lx < n2) {
|
|
// optimization of: draw_line(target, lx,ly, n,ly, n2);
|
|
for (j=lx; j < n2; ++j)
|
|
LINE_OP(target[j], inverse_db_table[ly]);
|
|
CHECK(f);
|
|
}
|
|
}
|
|
return TRUE;
|
|
}
|
|
|
|
// The meaning of "left" and "right"
|
|
//
|
|
// For a given frame:
|
|
// we compute samples from 0..n
|
|
// window_center is n/2
|
|
// we'll window and mix the samples from left_start to left_end with data from the previous frame
|
|
// all of the samples from left_end to right_start can be output without mixing; however,
|
|
// this interval is 0-length except when transitioning between short and long frames
|
|
// all of the samples from right_start to right_end need to be mixed with the next frame,
|
|
// which we don't have, so those get saved in a buffer
|
|
// frame N's right_end-right_start, the number of samples to mix with the next frame,
|
|
// has to be the same as frame N+1's left_end-left_start (which they are by
|
|
// construction)
|
|
|
|
static int vorbis_decode_initial(vorb *f, int *p_left_start, int *p_left_end, int *p_right_start, int *p_right_end, int *mode)
|
|
{
|
|
Mode *m;
|
|
int i, n, prev, next, window_center;
|
|
f->channel_buffer_start = f->channel_buffer_end = 0;
|
|
|
|
retry:
|
|
if (f->eof) return FALSE;
|
|
if (!maybe_start_packet(f))
|
|
return FALSE;
|
|
// check packet type
|
|
if (get_bits(f,1) != 0) {
|
|
if (IS_PUSH_MODE(f))
|
|
return error(f,VORBIS_bad_packet_type);
|
|
while (EOP != get8_packet(f));
|
|
goto retry;
|
|
}
|
|
|
|
if (f->alloc.alloc_buffer)
|
|
assert(f->alloc.alloc_buffer_length_in_bytes == f->temp_offset);
|
|
|
|
i = get_bits(f, ilog(f->mode_count-1));
|
|
if (i == EOP) return FALSE;
|
|
if (i >= f->mode_count) return FALSE;
|
|
*mode = i;
|
|
m = f->mode_config + i;
|
|
if (m->blockflag) {
|
|
n = f->blocksize_1;
|
|
prev = get_bits(f,1);
|
|
next = get_bits(f,1);
|
|
} else {
|
|
prev = next = 0;
|
|
n = f->blocksize_0;
|
|
}
|
|
|
|
// WINDOWING
|
|
|
|
window_center = n >> 1;
|
|
if (m->blockflag && !prev) {
|
|
*p_left_start = (n - f->blocksize_0) >> 2;
|
|
*p_left_end = (n + f->blocksize_0) >> 2;
|
|
} else {
|
|
*p_left_start = 0;
|
|
*p_left_end = window_center;
|
|
}
|
|
if (m->blockflag && !next) {
|
|
*p_right_start = (n*3 - f->blocksize_0) >> 2;
|
|
*p_right_end = (n*3 + f->blocksize_0) >> 2;
|
|
} else {
|
|
*p_right_start = window_center;
|
|
*p_right_end = n;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static int vorbis_decode_packet_rest(vorb *f, int *len, Mode *m, int left_start, int left_end, int right_start, int right_end, int *p_left)
|
|
{
|
|
Mapping *map;
|
|
int i,j,k,n,n2;
|
|
int zero_channel[256];
|
|
int really_zero_channel[256];
|
|
|
|
// WINDOWING
|
|
|
|
n = f->blocksize[m->blockflag];
|
|
map = &f->mapping[m->mapping];
|
|
|
|
// FLOORS
|
|
n2 = n >> 1;
|
|
|
|
CHECK(f);
|
|
|
|
for (i=0; i < f->channels; ++i) {
|
|
int s = map->chan[i].mux, floor;
|
|
zero_channel[i] = FALSE;
|
|
floor = map->submap_floor[s];
|
|
if (f->floor_types[floor] == 0) {
|
|
return error(f, VORBIS_invalid_stream);
|
|
} else {
|
|
Floor1 *g = &f->floor_config[floor].floor1;
|
|
if (get_bits(f, 1)) {
|
|
short *finalY;
|
|
uint8 step2_flag[256];
|
|
static int range_list[4] = { 256, 128, 86, 64 };
|
|
int range = range_list[g->floor1_multiplier-1];
|
|
int offset = 2;
|
|
finalY = f->finalY[i];
|
|
finalY[0] = get_bits(f, ilog(range)-1);
|
|
finalY[1] = get_bits(f, ilog(range)-1);
|
|
for (j=0; j < g->partitions; ++j) {
|
|
int pclass = g->partition_class_list[j];
|
|
int cdim = g->class_dimensions[pclass];
|
|
int cbits = g->class_subclasses[pclass];
|
|
int csub = (1 << cbits)-1;
|
|
int cval = 0;
|
|
if (cbits) {
|
|
Codebook *c = f->codebooks + g->class_masterbooks[pclass];
|
|
DECODE(cval,f,c);
|
|
}
|
|
for (k=0; k < cdim; ++k) {
|
|
int book = g->subclass_books[pclass][cval & csub];
|
|
cval = cval >> cbits;
|
|
if (book >= 0) {
|
|
int temp;
|
|
Codebook *c = f->codebooks + book;
|
|
DECODE(temp,f,c);
|
|
finalY[offset++] = temp;
|
|
} else
|
|
finalY[offset++] = 0;
|
|
}
|
|
}
|
|
if (f->valid_bits == INVALID_BITS) goto error; // behavior according to spec
|
|
step2_flag[0] = step2_flag[1] = 1;
|
|
for (j=2; j < g->values; ++j) {
|
|
int low, high, pred, highroom, lowroom, room, val;
|
|
low = g->neighbors[j][0];
|
|
high = g->neighbors[j][1];
|
|
//neighbors(g->Xlist, j, &low, &high);
|
|
pred = predict_point(g->Xlist[j], g->Xlist[low], g->Xlist[high], finalY[low], finalY[high]);
|
|
val = finalY[j];
|
|
highroom = range - pred;
|
|
lowroom = pred;
|
|
if (highroom < lowroom)
|
|
room = highroom * 2;
|
|
else
|
|
room = lowroom * 2;
|
|
if (val) {
|
|
step2_flag[low] = step2_flag[high] = 1;
|
|
step2_flag[j] = 1;
|
|
if (val >= room)
|
|
if (highroom > lowroom)
|
|
finalY[j] = val - lowroom + pred;
|
|
else
|
|
finalY[j] = pred - val + highroom - 1;
|
|
else
|
|
if (val & 1)
|
|
finalY[j] = pred - ((val+1)>>1);
|
|
else
|
|
finalY[j] = pred + (val>>1);
|
|
} else {
|
|
step2_flag[j] = 0;
|
|
finalY[j] = pred;
|
|
}
|
|
}
|
|
|
|
#ifdef STB_VORBIS_NO_DEFER_FLOOR
|
|
do_floor(f, map, i, n, f->floor_buffers[i], finalY, step2_flag);
|
|
#else
|
|
// defer final floor computation until _after_ residue
|
|
for (j=0; j < g->values; ++j) {
|
|
if (!step2_flag[j])
|
|
finalY[j] = -1;
|
|
}
|
|
#endif
|
|
} else {
|
|
error:
|
|
zero_channel[i] = TRUE;
|
|
}
|
|
// So we just defer everything else to later
|
|
|
|
// at this point we've decoded the floor into buffer
|
|
}
|
|
}
|
|
CHECK(f);
|
|
// at this point we've decoded all floors
|
|
|
|
if (f->alloc.alloc_buffer)
|
|
assert(f->alloc.alloc_buffer_length_in_bytes == f->temp_offset);
|
|
|
|
// re-enable coupled channels if necessary
|
|
memcpy(really_zero_channel, zero_channel, sizeof(really_zero_channel[0]) * f->channels);
|
|
for (i=0; i < map->coupling_steps; ++i)
|
|
if (!zero_channel[map->chan[i].magnitude] || !zero_channel[map->chan[i].angle]) {
|
|
zero_channel[map->chan[i].magnitude] = zero_channel[map->chan[i].angle] = FALSE;
|
|
}
|
|
|
|
CHECK(f);
|
|
// RESIDUE DECODE
|
|
for (i=0; i < map->submaps; ++i) {
|
|
float *residue_buffers[STB_VORBIS_MAX_CHANNELS];
|
|
int r;
|
|
uint8 do_not_decode[256];
|
|
int ch = 0;
|
|
for (j=0; j < f->channels; ++j) {
|
|
if (map->chan[j].mux == i) {
|
|
if (zero_channel[j]) {
|
|
do_not_decode[ch] = TRUE;
|
|
residue_buffers[ch] = NULL;
|
|
} else {
|
|
do_not_decode[ch] = FALSE;
|
|
residue_buffers[ch] = f->channel_buffers[j];
|
|
}
|
|
++ch;
|
|
}
|
|
}
|
|
r = map->submap_residue[i];
|
|
decode_residue(f, residue_buffers, ch, n2, r, do_not_decode);
|
|
}
|
|
|
|
if (f->alloc.alloc_buffer)
|
|
assert(f->alloc.alloc_buffer_length_in_bytes == f->temp_offset);
|
|
CHECK(f);
|
|
|
|
// INVERSE COUPLING
|
|
for (i = map->coupling_steps-1; i >= 0; --i) {
|
|
int n2 = n >> 1;
|
|
float *m = f->channel_buffers[map->chan[i].magnitude];
|
|
float *a = f->channel_buffers[map->chan[i].angle ];
|
|
for (j=0; j < n2; ++j) {
|
|
float a2,m2;
|
|
if (m[j] > 0)
|
|
if (a[j] > 0)
|
|
m2 = m[j], a2 = m[j] - a[j];
|
|
else
|
|
a2 = m[j], m2 = m[j] + a[j];
|
|
else
|
|
if (a[j] > 0)
|
|
m2 = m[j], a2 = m[j] + a[j];
|
|
else
|
|
a2 = m[j], m2 = m[j] - a[j];
|
|
m[j] = m2;
|
|
a[j] = a2;
|
|
}
|
|
}
|
|
CHECK(f);
|
|
|
|
// finish decoding the floors
|
|
#ifndef STB_VORBIS_NO_DEFER_FLOOR
|
|
for (i=0; i < f->channels; ++i) {
|
|
if (really_zero_channel[i]) {
|
|
memset(f->channel_buffers[i], 0, sizeof(*f->channel_buffers[i]) * n2);
|
|
} else {
|
|
do_floor(f, map, i, n, f->channel_buffers[i], f->finalY[i], NULL);
|
|
}
|
|
}
|
|
#else
|
|
for (i=0; i < f->channels; ++i) {
|
|
if (really_zero_channel[i]) {
|
|
memset(f->channel_buffers[i], 0, sizeof(*f->channel_buffers[i]) * n2);
|
|
} else {
|
|
for (j=0; j < n2; ++j)
|
|
f->channel_buffers[i][j] *= f->floor_buffers[i][j];
|
|
}
|
|
}
|
|
#endif
|
|
|
|
// INVERSE MDCT
|
|
CHECK(f);
|
|
for (i=0; i < f->channels; ++i)
|
|
inverse_mdct(f->channel_buffers[i], n, f, m->blockflag);
|
|
CHECK(f);
|
|
|
|
// this shouldn't be necessary, unless we exited on an error
|
|
// and want to flush to get to the next packet
|
|
flush_packet(f);
|
|
|
|
if (f->first_decode) {
|
|
// assume we start so first non-discarded sample is sample 0
|
|
// this isn't to spec, but spec would require us to read ahead
|
|
// and decode the size of all current frames--could be done,
|
|
// but presumably it's not a commonly used feature
|
|
f->current_loc = -n2; // start of first frame is positioned for discard
|
|
// we might have to discard samples "from" the next frame too,
|
|
// if we're lapping a large block then a small at the start?
|
|
f->discard_samples_deferred = n - right_end;
|
|
f->current_loc_valid = TRUE;
|
|
f->first_decode = FALSE;
|
|
} else if (f->discard_samples_deferred) {
|
|
if (f->discard_samples_deferred >= right_start - left_start) {
|
|
f->discard_samples_deferred -= (right_start - left_start);
|
|
left_start = right_start;
|
|
*p_left = left_start;
|
|
} else {
|
|
left_start += f->discard_samples_deferred;
|
|
*p_left = left_start;
|
|
f->discard_samples_deferred = 0;
|
|
}
|
|
} else if (f->previous_length == 0 && f->current_loc_valid) {
|
|
// we're recovering from a seek... that means we're going to discard
|
|
// the samples from this packet even though we know our position from
|
|
// the last page header, so we need to update the position based on
|
|
// the discarded samples here
|
|
// but wait, the code below is going to add this in itself even
|
|
// on a discard, so we don't need to do it here...
|
|
}
|
|
|
|
// check if we have ogg information about the sample # for this packet
|
|
if (f->last_seg_which == f->end_seg_with_known_loc) {
|
|
// if we have a valid current loc, and this is final:
|
|
if (f->current_loc_valid && (f->page_flag & PAGEFLAG_last_page)) {
|
|
uint32 current_end = f->known_loc_for_packet;
|
|
// then let's infer the size of the (probably) short final frame
|
|
if (current_end < f->current_loc + (right_end-left_start)) {
|
|
if (current_end < f->current_loc) {
|
|
// negative truncation, that's impossible!
|
|
*len = 0;
|
|
} else {
|
|
*len = current_end - f->current_loc;
|
|
}
|
|
*len += left_start; // this doesn't seem right, but has no ill effect on my test files
|
|
if (*len > right_end) *len = right_end; // this should never happen
|
|
f->current_loc += *len;
|
|
return TRUE;
|
|
}
|
|
}
|
|
// otherwise, just set our sample loc
|
|
// guess that the ogg granule pos refers to the _middle_ of the
|
|
// last frame?
|
|
// set f->current_loc to the position of left_start
|
|
f->current_loc = f->known_loc_for_packet - (n2-left_start);
|
|
f->current_loc_valid = TRUE;
|
|
}
|
|
if (f->current_loc_valid)
|
|
f->current_loc += (right_start - left_start);
|
|
|
|
if (f->alloc.alloc_buffer)
|
|
assert(f->alloc.alloc_buffer_length_in_bytes == f->temp_offset);
|
|
*len = right_end; // ignore samples after the window goes to 0
|
|
CHECK(f);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static int vorbis_decode_packet(vorb *f, int *len, int *p_left, int *p_right)
|
|
{
|
|
int mode, left_end, right_end;
|
|
if (!vorbis_decode_initial(f, p_left, &left_end, p_right, &right_end, &mode)) return 0;
|
|
return vorbis_decode_packet_rest(f, len, f->mode_config + mode, *p_left, left_end, *p_right, right_end, p_left);
|
|
}
|
|
|
|
static int vorbis_finish_frame(stb_vorbis *f, int len, int left, int right)
|
|
{
|
|
int prev,i,j;
|
|
// we use right&left (the start of the right- and left-window sin()-regions)
|
|
// to determine how much to return, rather than inferring from the rules
|
|
// (same result, clearer code); 'left' indicates where our sin() window
|
|
// starts, therefore where the previous window's right edge starts, and
|
|
// therefore where to start mixing from the previous buffer. 'right'
|
|
// indicates where our sin() ending-window starts, therefore that's where
|
|
// we start saving, and where our returned-data ends.
|
|
|
|
// mixin from previous window
|
|
if (f->previous_length) {
|
|
int i,j, n = f->previous_length;
|
|
float *w = get_window(f, n);
|
|
if (w == NULL) return 0;
|
|
for (i=0; i < f->channels; ++i) {
|
|
for (j=0; j < n; ++j)
|
|
f->channel_buffers[i][left+j] =
|
|
f->channel_buffers[i][left+j]*w[ j] +
|
|
f->previous_window[i][ j]*w[n-1-j];
|
|
}
|
|
}
|
|
|
|
prev = f->previous_length;
|
|
|
|
// last half of this data becomes previous window
|
|
f->previous_length = len - right;
|
|
|
|
// @OPTIMIZE: could avoid this copy by double-buffering the
|
|
// output (flipping previous_window with channel_buffers), but
|
|
// then previous_window would have to be 2x as large, and
|
|
// channel_buffers couldn't be temp mem (although they're NOT
|
|
// currently temp mem, they could be (unless we want to level
|
|
// performance by spreading out the computation))
|
|
for (i=0; i < f->channels; ++i)
|
|
for (j=0; right+j < len; ++j)
|
|
f->previous_window[i][j] = f->channel_buffers[i][right+j];
|
|
|
|
if (!prev)
|
|
// there was no previous packet, so this data isn't valid...
|
|
// this isn't entirely true, only the would-have-overlapped data
|
|
// isn't valid, but this seems to be what the spec requires
|
|
return 0;
|
|
|
|
// truncate a short frame
|
|
if (len < right) right = len;
|
|
|
|
f->samples_output += right-left;
|
|
|
|
return right - left;
|
|
}
|
|
|
|
static int vorbis_pump_first_frame(stb_vorbis *f)
|
|
{
|
|
int len, right, left, res;
|
|
res = vorbis_decode_packet(f, &len, &left, &right);
|
|
if (res)
|
|
vorbis_finish_frame(f, len, left, right);
|
|
return res;
|
|
}
|
|
|
|
#ifndef STB_VORBIS_NO_PUSHDATA_API
|
|
static int is_whole_packet_present(stb_vorbis *f)
|
|
{
|
|
// make sure that we have the packet available before continuing...
|
|
// this requires a full ogg parse, but we know we can fetch from f->stream
|
|
|
|
// instead of coding this out explicitly, we could save the current read state,
|
|
// read the next packet with get8() until end-of-packet, check f->eof, then
|
|
// reset the state? but that would be slower, esp. since we'd have over 256 bytes
|
|
// of state to restore (primarily the page segment table)
|
|
|
|
int s = f->next_seg, first = TRUE;
|
|
uint8 *p = f->stream;
|
|
|
|
if (s != -1) { // if we're not starting the packet with a 'continue on next page' flag
|
|
for (; s < f->segment_count; ++s) {
|
|
p += f->segments[s];
|
|
if (f->segments[s] < 255) // stop at first short segment
|
|
break;
|
|
}
|
|
// either this continues, or it ends it...
|
|
if (s == f->segment_count)
|
|
s = -1; // set 'crosses page' flag
|
|
if (p > f->stream_end) return error(f, VORBIS_need_more_data);
|
|
first = FALSE;
|
|
}
|
|
for (; s == -1;) {
|
|
uint8 *q;
|
|
int n;
|
|
|
|
// check that we have the page header ready
|
|
if (p + 26 >= f->stream_end) return error(f, VORBIS_need_more_data);
|
|
// validate the page
|
|
if (memcmp(p, ogg_page_header, 4)) return error(f, VORBIS_invalid_stream);
|
|
if (p[4] != 0) return error(f, VORBIS_invalid_stream);
|
|
if (first) { // the first segment must NOT have 'continued_packet', later ones MUST
|
|
if (f->previous_length)
|
|
if ((p[5] & PAGEFLAG_continued_packet)) return error(f, VORBIS_invalid_stream);
|
|
// if no previous length, we're resynching, so we can come in on a continued-packet,
|
|
// which we'll just drop
|
|
} else {
|
|
if (!(p[5] & PAGEFLAG_continued_packet)) return error(f, VORBIS_invalid_stream);
|
|
}
|
|
n = p[26]; // segment counts
|
|
q = p+27; // q points to segment table
|
|
p = q + n; // advance past header
|
|
// make sure we've read the segment table
|
|
if (p > f->stream_end) return error(f, VORBIS_need_more_data);
|
|
for (s=0; s < n; ++s) {
|
|
p += q[s];
|
|
if (q[s] < 255)
|
|
break;
|
|
}
|
|
if (s == n)
|
|
s = -1; // set 'crosses page' flag
|
|
if (p > f->stream_end) return error(f, VORBIS_need_more_data);
|
|
first = FALSE;
|
|
}
|
|
return TRUE;
|
|
}
|
|
#endif // !STB_VORBIS_NO_PUSHDATA_API
|
|
|
|
static int start_decoder(vorb *f)
|
|
{
|
|
uint8 header[6], x,y;
|
|
int len,i,j,k, max_submaps = 0;
|
|
int longest_floorlist=0;
|
|
|
|
// first page, first packet
|
|
f->first_decode = TRUE;
|
|
|
|
if (!start_page(f)) return FALSE;
|
|
// validate page flag
|
|
if (!(f->page_flag & PAGEFLAG_first_page)) return error(f, VORBIS_invalid_first_page);
|
|
if (f->page_flag & PAGEFLAG_last_page) return error(f, VORBIS_invalid_first_page);
|
|
if (f->page_flag & PAGEFLAG_continued_packet) return error(f, VORBIS_invalid_first_page);
|
|
// check for expected packet length
|
|
if (f->segment_count != 1) return error(f, VORBIS_invalid_first_page);
|
|
if (f->segments[0] != 30) {
|
|
// check for the Ogg skeleton fishead identifying header to refine our error
|
|
if (f->segments[0] == 64 &&
|
|
getn(f, header, 6) &&
|
|
header[0] == 'f' &&
|
|
header[1] == 'i' &&
|
|
header[2] == 's' &&
|
|
header[3] == 'h' &&
|
|
header[4] == 'e' &&
|
|
header[5] == 'a' &&
|
|
get8(f) == 'd' &&
|
|
get8(f) == '\0') return error(f, VORBIS_ogg_skeleton_not_supported);
|
|
else
|
|
return error(f, VORBIS_invalid_first_page);
|
|
}
|
|
|
|
// read packet
|
|
// check packet header
|
|
if (get8(f) != VORBIS_packet_id) return error(f, VORBIS_invalid_first_page);
|
|
if (!getn(f, header, 6)) return error(f, VORBIS_unexpected_eof);
|
|
if (!vorbis_validate(header)) return error(f, VORBIS_invalid_first_page);
|
|
// vorbis_version
|
|
if (get32(f) != 0) return error(f, VORBIS_invalid_first_page);
|
|
f->channels = get8(f); if (!f->channels) return error(f, VORBIS_invalid_first_page);
|
|
if (f->channels > STB_VORBIS_MAX_CHANNELS) return error(f, VORBIS_too_many_channels);
|
|
f->sample_rate = get32(f); if (!f->sample_rate) return error(f, VORBIS_invalid_first_page);
|
|
get32(f); // bitrate_maximum
|
|
get32(f); // bitrate_nominal
|
|
get32(f); // bitrate_minimum
|
|
x = get8(f);
|
|
{
|
|
int log0,log1;
|
|
log0 = x & 15;
|
|
log1 = x >> 4;
|
|
f->blocksize_0 = 1 << log0;
|
|
f->blocksize_1 = 1 << log1;
|
|
if (log0 < 6 || log0 > 13) return error(f, VORBIS_invalid_setup);
|
|
if (log1 < 6 || log1 > 13) return error(f, VORBIS_invalid_setup);
|
|
if (log0 > log1) return error(f, VORBIS_invalid_setup);
|
|
}
|
|
|
|
// framing_flag
|
|
x = get8(f);
|
|
if (!(x & 1)) return error(f, VORBIS_invalid_first_page);
|
|
|
|
// second packet!
|
|
if (!start_page(f)) return FALSE;
|
|
|
|
if (!start_packet(f)) return FALSE;
|
|
|
|
if (!next_segment(f)) return FALSE;
|
|
|
|
if (get8_packet(f) != VORBIS_packet_comment) return error(f, VORBIS_invalid_setup);
|
|
for (i=0; i < 6; ++i) header[i] = get8_packet(f);
|
|
if (!vorbis_validate(header)) return error(f, VORBIS_invalid_setup);
|
|
//file vendor
|
|
len = get32_packet(f);
|
|
f->vendor = (char*)setup_malloc(f, sizeof(char) * (len+1));
|
|
for(i=0; i < len; ++i) {
|
|
f->vendor[i] = get8_packet(f);
|
|
}
|
|
f->vendor[len] = (char)'\0';
|
|
//user comments
|
|
f->comment_list_length = get32_packet(f);
|
|
f->comment_list = (char**)setup_malloc(f, sizeof(char*) * (f->comment_list_length));
|
|
|
|
for(i=0; i < f->comment_list_length; ++i) {
|
|
len = get32_packet(f);
|
|
f->comment_list[i] = (char*)setup_malloc(f, sizeof(char) * (len+1));
|
|
|
|
for(j=0; j < len; ++j) {
|
|
f->comment_list[i][j] = get8_packet(f);
|
|
}
|
|
f->comment_list[i][len] = (char)'\0';
|
|
}
|
|
|
|
// framing_flag
|
|
x = get8_packet(f);
|
|
if (!(x & 1)) return error(f, VORBIS_invalid_setup);
|
|
|
|
|
|
skip(f, f->bytes_in_seg);
|
|
f->bytes_in_seg = 0;
|
|
|
|
do {
|
|
len = next_segment(f);
|
|
skip(f, len);
|
|
f->bytes_in_seg = 0;
|
|
} while (len);
|
|
|
|
// third packet!
|
|
if (!start_packet(f)) return FALSE;
|
|
|
|
#ifndef STB_VORBIS_NO_PUSHDATA_API
|
|
if (IS_PUSH_MODE(f)) {
|
|
if (!is_whole_packet_present(f)) {
|
|
// convert error in ogg header to write type
|
|
if (f->error == VORBIS_invalid_stream)
|
|
f->error = VORBIS_invalid_setup;
|
|
return FALSE;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
crc32_init(); // always init it, to avoid multithread race conditions
|
|
|
|
if (get8_packet(f) != VORBIS_packet_setup) return error(f, VORBIS_invalid_setup);
|
|
for (i=0; i < 6; ++i) header[i] = get8_packet(f);
|
|
if (!vorbis_validate(header)) return error(f, VORBIS_invalid_setup);
|
|
|
|
// codebooks
|
|
|
|
f->codebook_count = get_bits(f,8) + 1;
|
|
f->codebooks = (Codebook *) setup_malloc(f, sizeof(*f->codebooks) * f->codebook_count);
|
|
if (f->codebooks == NULL) return error(f, VORBIS_outofmem);
|
|
memset(f->codebooks, 0, sizeof(*f->codebooks) * f->codebook_count);
|
|
for (i=0; i < f->codebook_count; ++i) {
|
|
uint32 *values;
|
|
int ordered, sorted_count;
|
|
int total=0;
|
|
uint8 *lengths;
|
|
Codebook *c = f->codebooks+i;
|
|
CHECK(f);
|
|
x = get_bits(f, 8); if (x != 0x42) return error(f, VORBIS_invalid_setup);
|
|
x = get_bits(f, 8); if (x != 0x43) return error(f, VORBIS_invalid_setup);
|
|
x = get_bits(f, 8); if (x != 0x56) return error(f, VORBIS_invalid_setup);
|
|
x = get_bits(f, 8);
|
|
c->dimensions = (get_bits(f, 8)<<8) + x;
|
|
x = get_bits(f, 8);
|
|
y = get_bits(f, 8);
|
|
c->entries = (get_bits(f, 8)<<16) + (y<<8) + x;
|
|
ordered = get_bits(f,1);
|
|
c->sparse = ordered ? 0 : get_bits(f,1);
|
|
|
|
if (c->dimensions == 0 && c->entries != 0) return error(f, VORBIS_invalid_setup);
|
|
|
|
if (c->sparse)
|
|
lengths = (uint8 *) setup_temp_malloc(f, c->entries);
|
|
else
|
|
lengths = c->codeword_lengths = (uint8 *) setup_malloc(f, c->entries);
|
|
|
|
if (!lengths) return error(f, VORBIS_outofmem);
|
|
|
|
if (ordered) {
|
|
int current_entry = 0;
|
|
int current_length = get_bits(f,5) + 1;
|
|
while (current_entry < c->entries) {
|
|
int limit = c->entries - current_entry;
|
|
int n = get_bits(f, ilog(limit));
|
|
if (current_length >= 32) return error(f, VORBIS_invalid_setup);
|
|
if (current_entry + n > (int) c->entries) { return error(f, VORBIS_invalid_setup); }
|
|
memset(lengths + current_entry, current_length, n);
|
|
current_entry += n;
|
|
++current_length;
|
|
}
|
|
} else {
|
|
for (j=0; j < c->entries; ++j) {
|
|
int present = c->sparse ? get_bits(f,1) : 1;
|
|
if (present) {
|
|
lengths[j] = get_bits(f, 5) + 1;
|
|
++total;
|
|
if (lengths[j] == 32)
|
|
return error(f, VORBIS_invalid_setup);
|
|
} else {
|
|
lengths[j] = NO_CODE;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (c->sparse && total >= c->entries >> 2) {
|
|
// convert sparse items to non-sparse!
|
|
if (c->entries > (int) f->setup_temp_memory_required)
|
|
f->setup_temp_memory_required = c->entries;
|
|
|
|
c->codeword_lengths = (uint8 *) setup_malloc(f, c->entries);
|
|
if (c->codeword_lengths == NULL) return error(f, VORBIS_outofmem);
|
|
memcpy(c->codeword_lengths, lengths, c->entries);
|
|
setup_temp_free(f, lengths, c->entries); // note this is only safe if there have been no intervening temp mallocs!
|
|
lengths = c->codeword_lengths;
|
|
c->sparse = 0;
|
|
}
|
|
|
|
// compute the size of the sorted tables
|
|
if (c->sparse) {
|
|
sorted_count = total;
|
|
} else {
|
|
sorted_count = 0;
|
|
#ifndef STB_VORBIS_NO_HUFFMAN_BINARY_SEARCH
|
|
for (j=0; j < c->entries; ++j)
|
|
if (lengths[j] > STB_VORBIS_FAST_HUFFMAN_LENGTH && lengths[j] != NO_CODE)
|
|
++sorted_count;
|
|
#endif
|
|
}
|
|
|
|
c->sorted_entries = sorted_count;
|
|
values = NULL;
|
|
|
|
CHECK(f);
|
|
if (!c->sparse) {
|
|
c->codewords = (uint32 *) setup_malloc(f, sizeof(c->codewords[0]) * c->entries);
|
|
if (!c->codewords) return error(f, VORBIS_outofmem);
|
|
} else {
|
|
unsigned int size;
|
|
if (c->sorted_entries) {
|
|
c->codeword_lengths = (uint8 *) setup_malloc(f, c->sorted_entries);
|
|
if (!c->codeword_lengths) return error(f, VORBIS_outofmem);
|
|
c->codewords = (uint32 *) setup_temp_malloc(f, sizeof(*c->codewords) * c->sorted_entries);
|
|
if (!c->codewords) return error(f, VORBIS_outofmem);
|
|
values = (uint32 *) setup_temp_malloc(f, sizeof(*values) * c->sorted_entries);
|
|
if (!values) return error(f, VORBIS_outofmem);
|
|
}
|
|
size = c->entries + (sizeof(*c->codewords) + sizeof(*values)) * c->sorted_entries;
|
|
if (size > f->setup_temp_memory_required)
|
|
f->setup_temp_memory_required = size;
|
|
}
|
|
|
|
if (!compute_codewords(c, lengths, c->entries, values)) {
|
|
if (c->sparse) setup_temp_free(f, values, 0);
|
|
return error(f, VORBIS_invalid_setup);
|
|
}
|
|
|
|
if (c->sorted_entries) {
|
|
// allocate an extra slot for sentinels
|
|
c->sorted_codewords = (uint32 *) setup_malloc(f, sizeof(*c->sorted_codewords) * (c->sorted_entries+1));
|
|
if (c->sorted_codewords == NULL) return error(f, VORBIS_outofmem);
|
|
// allocate an extra slot at the front so that c->sorted_values[-1] is defined
|
|
// so that we can catch that case without an extra if
|
|
c->sorted_values = ( int *) setup_malloc(f, sizeof(*c->sorted_values ) * (c->sorted_entries+1));
|
|
if (c->sorted_values == NULL) return error(f, VORBIS_outofmem);
|
|
++c->sorted_values;
|
|
c->sorted_values[-1] = -1;
|
|
compute_sorted_huffman(c, lengths, values);
|
|
}
|
|
|
|
if (c->sparse) {
|
|
setup_temp_free(f, values, sizeof(*values)*c->sorted_entries);
|
|
setup_temp_free(f, c->codewords, sizeof(*c->codewords)*c->sorted_entries);
|
|
setup_temp_free(f, lengths, c->entries);
|
|
c->codewords = NULL;
|
|
}
|
|
|
|
compute_accelerated_huffman(c);
|
|
|
|
CHECK(f);
|
|
c->lookup_type = get_bits(f, 4);
|
|
if (c->lookup_type > 2) return error(f, VORBIS_invalid_setup);
|
|
if (c->lookup_type > 0) {
|
|
uint16 *mults;
|
|
c->minimum_value = float32_unpack(get_bits(f, 32));
|
|
c->delta_value = float32_unpack(get_bits(f, 32));
|
|
c->value_bits = get_bits(f, 4)+1;
|
|
c->sequence_p = get_bits(f,1);
|
|
if (c->lookup_type == 1) {
|
|
int values = lookup1_values(c->entries, c->dimensions);
|
|
if (values < 0) return error(f, VORBIS_invalid_setup);
|
|
c->lookup_values = (uint32) values;
|
|
} else {
|
|
c->lookup_values = c->entries * c->dimensions;
|
|
}
|
|
if (c->lookup_values == 0) return error(f, VORBIS_invalid_setup);
|
|
mults = (uint16 *) setup_temp_malloc(f, sizeof(mults[0]) * c->lookup_values);
|
|
if (mults == NULL) return error(f, VORBIS_outofmem);
|
|
for (j=0; j < (int) c->lookup_values; ++j) {
|
|
int q = get_bits(f, c->value_bits);
|
|
if (q == EOP) { setup_temp_free(f,mults,sizeof(mults[0])*c->lookup_values); return error(f, VORBIS_invalid_setup); }
|
|
mults[j] = q;
|
|
}
|
|
|
|
#ifndef STB_VORBIS_DIVIDES_IN_CODEBOOK
|
|
if (c->lookup_type == 1) {
|
|
int len, sparse = c->sparse;
|
|
float last=0;
|
|
// pre-expand the lookup1-style multiplicands, to avoid a divide in the inner loop
|
|
if (sparse) {
|
|
if (c->sorted_entries == 0) goto skip;
|
|
c->multiplicands = (codetype *) setup_malloc(f, sizeof(c->multiplicands[0]) * c->sorted_entries * c->dimensions);
|
|
} else
|
|
c->multiplicands = (codetype *) setup_malloc(f, sizeof(c->multiplicands[0]) * c->entries * c->dimensions);
|
|
if (c->multiplicands == NULL) { setup_temp_free(f,mults,sizeof(mults[0])*c->lookup_values); return error(f, VORBIS_outofmem); }
|
|
len = sparse ? c->sorted_entries : c->entries;
|
|
for (j=0; j < len; ++j) {
|
|
unsigned int z = sparse ? c->sorted_values[j] : j;
|
|
unsigned int div=1;
|
|
for (k=0; k < c->dimensions; ++k) {
|
|
int off = (z / div) % c->lookup_values;
|
|
float val = mults[off];
|
|
val = mults[off]*c->delta_value + c->minimum_value + last;
|
|
c->multiplicands[j*c->dimensions + k] = val;
|
|
if (c->sequence_p)
|
|
last = val;
|
|
if (k+1 < c->dimensions) {
|
|
if (div > UINT_MAX / (unsigned int) c->lookup_values) {
|
|
setup_temp_free(f, mults,sizeof(mults[0])*c->lookup_values);
|
|
return error(f, VORBIS_invalid_setup);
|
|
}
|
|
div *= c->lookup_values;
|
|
}
|
|
}
|
|
}
|
|
c->lookup_type = 2;
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
float last=0;
|
|
CHECK(f);
|
|
c->multiplicands = (codetype *) setup_malloc(f, sizeof(c->multiplicands[0]) * c->lookup_values);
|
|
if (c->multiplicands == NULL) { setup_temp_free(f, mults,sizeof(mults[0])*c->lookup_values); return error(f, VORBIS_outofmem); }
|
|
for (j=0; j < (int) c->lookup_values; ++j) {
|
|
float val = mults[j] * c->delta_value + c->minimum_value + last;
|
|
c->multiplicands[j] = val;
|
|
if (c->sequence_p)
|
|
last = val;
|
|
}
|
|
}
|
|
#ifndef STB_VORBIS_DIVIDES_IN_CODEBOOK
|
|
skip:;
|
|
#endif
|
|
setup_temp_free(f, mults, sizeof(mults[0])*c->lookup_values);
|
|
|
|
CHECK(f);
|
|
}
|
|
CHECK(f);
|
|
}
|
|
|
|
// time domain transfers (notused)
|
|
|
|
x = get_bits(f, 6) + 1;
|
|
for (i=0; i < x; ++i) {
|
|
uint32 z = get_bits(f, 16);
|
|
if (z != 0) return error(f, VORBIS_invalid_setup);
|
|
}
|
|
|
|
// Floors
|
|
f->floor_count = get_bits(f, 6)+1;
|
|
f->floor_config = (Floor *) setup_malloc(f, f->floor_count * sizeof(*f->floor_config));
|
|
if (f->floor_config == NULL) return error(f, VORBIS_outofmem);
|
|
for (i=0; i < f->floor_count; ++i) {
|
|
f->floor_types[i] = get_bits(f, 16);
|
|
if (f->floor_types[i] > 1) return error(f, VORBIS_invalid_setup);
|
|
if (f->floor_types[i] == 0) {
|
|
Floor0 *g = &f->floor_config[i].floor0;
|
|
g->order = get_bits(f,8);
|
|
g->rate = get_bits(f,16);
|
|
g->bark_map_size = get_bits(f,16);
|
|
g->amplitude_bits = get_bits(f,6);
|
|
g->amplitude_offset = get_bits(f,8);
|
|
g->number_of_books = get_bits(f,4) + 1;
|
|
for (j=0; j < g->number_of_books; ++j)
|
|
g->book_list[j] = get_bits(f,8);
|
|
return error(f, VORBIS_feature_not_supported);
|
|
} else {
|
|
stbv__floor_ordering p[31*8+2];
|
|
Floor1 *g = &f->floor_config[i].floor1;
|
|
int max_class = -1;
|
|
g->partitions = get_bits(f, 5);
|
|
for (j=0; j < g->partitions; ++j) {
|
|
g->partition_class_list[j] = get_bits(f, 4);
|
|
if (g->partition_class_list[j] > max_class)
|
|
max_class = g->partition_class_list[j];
|
|
}
|
|
for (j=0; j <= max_class; ++j) {
|
|
g->class_dimensions[j] = get_bits(f, 3)+1;
|
|
g->class_subclasses[j] = get_bits(f, 2);
|
|
if (g->class_subclasses[j]) {
|
|
g->class_masterbooks[j] = get_bits(f, 8);
|
|
if (g->class_masterbooks[j] >= f->codebook_count) return error(f, VORBIS_invalid_setup);
|
|
}
|
|
for (k=0; k < 1 << g->class_subclasses[j]; ++k) {
|
|
g->subclass_books[j][k] = get_bits(f,8)-1;
|
|
if (g->subclass_books[j][k] >= f->codebook_count) return error(f, VORBIS_invalid_setup);
|
|
}
|
|
}
|
|
g->floor1_multiplier = get_bits(f,2)+1;
|
|
g->rangebits = get_bits(f,4);
|
|
g->Xlist[0] = 0;
|
|
g->Xlist[1] = 1 << g->rangebits;
|
|
g->values = 2;
|
|
for (j=0; j < g->partitions; ++j) {
|
|
int c = g->partition_class_list[j];
|
|
for (k=0; k < g->class_dimensions[c]; ++k) {
|
|
g->Xlist[g->values] = get_bits(f, g->rangebits);
|
|
++g->values;
|
|
}
|
|
}
|
|
// precompute the sorting
|
|
for (j=0; j < g->values; ++j) {
|
|
p[j].x = g->Xlist[j];
|
|
p[j].id = j;
|
|
}
|
|
qsort(p, g->values, sizeof(p[0]), point_compare);
|
|
for (j=0; j < g->values-1; ++j)
|
|
if (p[j].x == p[j+1].x)
|
|
return error(f, VORBIS_invalid_setup);
|
|
for (j=0; j < g->values; ++j)
|
|
g->sorted_order[j] = (uint8) p[j].id;
|
|
// precompute the neighbors
|
|
for (j=2; j < g->values; ++j) {
|
|
int low = 0,hi = 0;
|
|
neighbors(g->Xlist, j, &low,&hi);
|
|
g->neighbors[j][0] = low;
|
|
g->neighbors[j][1] = hi;
|
|
}
|
|
|
|
if (g->values > longest_floorlist)
|
|
longest_floorlist = g->values;
|
|
}
|
|
}
|
|
|
|
// Residue
|
|
f->residue_count = get_bits(f, 6)+1;
|
|
f->residue_config = (Residue *) setup_malloc(f, f->residue_count * sizeof(f->residue_config[0]));
|
|
if (f->residue_config == NULL) return error(f, VORBIS_outofmem);
|
|
memset(f->residue_config, 0, f->residue_count * sizeof(f->residue_config[0]));
|
|
for (i=0; i < f->residue_count; ++i) {
|
|
uint8 residue_cascade[64];
|
|
Residue *r = f->residue_config+i;
|
|
f->residue_types[i] = get_bits(f, 16);
|
|
if (f->residue_types[i] > 2) return error(f, VORBIS_invalid_setup);
|
|
r->begin = get_bits(f, 24);
|
|
r->end = get_bits(f, 24);
|
|
if (r->end < r->begin) return error(f, VORBIS_invalid_setup);
|
|
r->part_size = get_bits(f,24)+1;
|
|
r->classifications = get_bits(f,6)+1;
|
|
r->classbook = get_bits(f,8);
|
|
if (r->classbook >= f->codebook_count) return error(f, VORBIS_invalid_setup);
|
|
for (j=0; j < r->classifications; ++j) {
|
|
uint8 high_bits=0;
|
|
uint8 low_bits=get_bits(f,3);
|
|
if (get_bits(f,1))
|
|
high_bits = get_bits(f,5);
|
|
residue_cascade[j] = high_bits*8 + low_bits;
|
|
}
|
|
r->residue_books = (short (*)[8]) setup_malloc(f, sizeof(r->residue_books[0]) * r->classifications);
|
|
if (r->residue_books == NULL) return error(f, VORBIS_outofmem);
|
|
for (j=0; j < r->classifications; ++j) {
|
|
for (k=0; k < 8; ++k) {
|
|
if (residue_cascade[j] & (1 << k)) {
|
|
r->residue_books[j][k] = get_bits(f, 8);
|
|
if (r->residue_books[j][k] >= f->codebook_count) return error(f, VORBIS_invalid_setup);
|
|
} else {
|
|
r->residue_books[j][k] = -1;
|
|
}
|
|
}
|
|
}
|
|
// precompute the classifications[] array to avoid inner-loop mod/divide
|
|
// call it 'classdata' since we already have r->classifications
|
|
r->classdata = (uint8 **) setup_malloc(f, sizeof(*r->classdata) * f->codebooks[r->classbook].entries);
|
|
if (!r->classdata) return error(f, VORBIS_outofmem);
|
|
memset(r->classdata, 0, sizeof(*r->classdata) * f->codebooks[r->classbook].entries);
|
|
for (j=0; j < f->codebooks[r->classbook].entries; ++j) {
|
|
int classwords = f->codebooks[r->classbook].dimensions;
|
|
int temp = j;
|
|
r->classdata[j] = (uint8 *) setup_malloc(f, sizeof(r->classdata[j][0]) * classwords);
|
|
if (r->classdata[j] == NULL) return error(f, VORBIS_outofmem);
|
|
for (k=classwords-1; k >= 0; --k) {
|
|
r->classdata[j][k] = temp % r->classifications;
|
|
temp /= r->classifications;
|
|
}
|
|
}
|
|
}
|
|
|
|
f->mapping_count = get_bits(f,6)+1;
|
|
f->mapping = (Mapping *) setup_malloc(f, f->mapping_count * sizeof(*f->mapping));
|
|
if (f->mapping == NULL) return error(f, VORBIS_outofmem);
|
|
memset(f->mapping, 0, f->mapping_count * sizeof(*f->mapping));
|
|
for (i=0; i < f->mapping_count; ++i) {
|
|
Mapping *m = f->mapping + i;
|
|
int mapping_type = get_bits(f,16);
|
|
if (mapping_type != 0) return error(f, VORBIS_invalid_setup);
|
|
m->chan = (MappingChannel *) setup_malloc(f, f->channels * sizeof(*m->chan));
|
|
if (m->chan == NULL) return error(f, VORBIS_outofmem);
|
|
if (get_bits(f,1))
|
|
m->submaps = get_bits(f,4)+1;
|
|
else
|
|
m->submaps = 1;
|
|
if (m->submaps > max_submaps)
|
|
max_submaps = m->submaps;
|
|
if (get_bits(f,1)) {
|
|
m->coupling_steps = get_bits(f,8)+1;
|
|
if (m->coupling_steps > f->channels) return error(f, VORBIS_invalid_setup);
|
|
for (k=0; k < m->coupling_steps; ++k) {
|
|
m->chan[k].magnitude = get_bits(f, ilog(f->channels-1));
|
|
m->chan[k].angle = get_bits(f, ilog(f->channels-1));
|
|
if (m->chan[k].magnitude >= f->channels) return error(f, VORBIS_invalid_setup);
|
|
if (m->chan[k].angle >= f->channels) return error(f, VORBIS_invalid_setup);
|
|
if (m->chan[k].magnitude == m->chan[k].angle) return error(f, VORBIS_invalid_setup);
|
|
}
|
|
} else
|
|
m->coupling_steps = 0;
|
|
|
|
// reserved field
|
|
if (get_bits(f,2)) return error(f, VORBIS_invalid_setup);
|
|
if (m->submaps > 1) {
|
|
for (j=0; j < f->channels; ++j) {
|
|
m->chan[j].mux = get_bits(f, 4);
|
|
if (m->chan[j].mux >= m->submaps) return error(f, VORBIS_invalid_setup);
|
|
}
|
|
} else
|
|
// @SPECIFICATION: this case is missing from the spec
|
|
for (j=0; j < f->channels; ++j)
|
|
m->chan[j].mux = 0;
|
|
|
|
for (j=0; j < m->submaps; ++j) {
|
|
get_bits(f,8); // discard
|
|
m->submap_floor[j] = get_bits(f,8);
|
|
m->submap_residue[j] = get_bits(f,8);
|
|
if (m->submap_floor[j] >= f->floor_count) return error(f, VORBIS_invalid_setup);
|
|
if (m->submap_residue[j] >= f->residue_count) return error(f, VORBIS_invalid_setup);
|
|
}
|
|
}
|
|
|
|
// Modes
|
|
f->mode_count = get_bits(f, 6)+1;
|
|
for (i=0; i < f->mode_count; ++i) {
|
|
Mode *m = f->mode_config+i;
|
|
m->blockflag = get_bits(f,1);
|
|
m->windowtype = get_bits(f,16);
|
|
m->transformtype = get_bits(f,16);
|
|
m->mapping = get_bits(f,8);
|
|
if (m->windowtype != 0) return error(f, VORBIS_invalid_setup);
|
|
if (m->transformtype != 0) return error(f, VORBIS_invalid_setup);
|
|
if (m->mapping >= f->mapping_count) return error(f, VORBIS_invalid_setup);
|
|
}
|
|
|
|
flush_packet(f);
|
|
|
|
f->previous_length = 0;
|
|
|
|
for (i=0; i < f->channels; ++i) {
|
|
f->channel_buffers[i] = (float *) setup_malloc(f, sizeof(float) * f->blocksize_1);
|
|
f->previous_window[i] = (float *) setup_malloc(f, sizeof(float) * f->blocksize_1/2);
|
|
f->finalY[i] = (int16 *) setup_malloc(f, sizeof(int16) * longest_floorlist);
|
|
if (f->channel_buffers[i] == NULL || f->previous_window[i] == NULL || f->finalY[i] == NULL) return error(f, VORBIS_outofmem);
|
|
memset(f->channel_buffers[i], 0, sizeof(float) * f->blocksize_1);
|
|
#ifdef STB_VORBIS_NO_DEFER_FLOOR
|
|
f->floor_buffers[i] = (float *) setup_malloc(f, sizeof(float) * f->blocksize_1/2);
|
|
if (f->floor_buffers[i] == NULL) return error(f, VORBIS_outofmem);
|
|
#endif
|
|
}
|
|
|
|
if (!init_blocksize(f, 0, f->blocksize_0)) return FALSE;
|
|
if (!init_blocksize(f, 1, f->blocksize_1)) return FALSE;
|
|
f->blocksize[0] = f->blocksize_0;
|
|
f->blocksize[1] = f->blocksize_1;
|
|
|
|
#ifdef STB_VORBIS_DIVIDE_TABLE
|
|
if (integer_divide_table[1][1]==0)
|
|
for (i=0; i < DIVTAB_NUMER; ++i)
|
|
for (j=1; j < DIVTAB_DENOM; ++j)
|
|
integer_divide_table[i][j] = i / j;
|
|
#endif
|
|
|
|
// compute how much temporary memory is needed
|
|
|
|
// 1.
|
|
{
|
|
uint32 imdct_mem = (f->blocksize_1 * sizeof(float) >> 1);
|
|
uint32 classify_mem;
|
|
int i,max_part_read=0;
|
|
for (i=0; i < f->residue_count; ++i) {
|
|
Residue *r = f->residue_config + i;
|
|
unsigned int actual_size = f->blocksize_1 / 2;
|
|
unsigned int limit_r_begin = r->begin < actual_size ? r->begin : actual_size;
|
|
unsigned int limit_r_end = r->end < actual_size ? r->end : actual_size;
|
|
int n_read = limit_r_end - limit_r_begin;
|
|
int part_read = n_read / r->part_size;
|
|
if (part_read > max_part_read)
|
|
max_part_read = part_read;
|
|
}
|
|
#ifndef STB_VORBIS_DIVIDES_IN_RESIDUE
|
|
classify_mem = f->channels * (sizeof(void*) + max_part_read * sizeof(uint8 *));
|
|
#else
|
|
classify_mem = f->channels * (sizeof(void*) + max_part_read * sizeof(int *));
|
|
#endif
|
|
|
|
// maximum reasonable partition size is f->blocksize_1
|
|
|
|
f->temp_memory_required = classify_mem;
|
|
if (imdct_mem > f->temp_memory_required)
|
|
f->temp_memory_required = imdct_mem;
|
|
}
|
|
|
|
|
|
if (f->alloc.alloc_buffer) {
|
|
assert(f->temp_offset == f->alloc.alloc_buffer_length_in_bytes);
|
|
// check if there's enough temp memory so we don't error later
|
|
if (f->setup_offset + sizeof(*f) + f->temp_memory_required > (unsigned) f->temp_offset)
|
|
return error(f, VORBIS_outofmem);
|
|
}
|
|
|
|
// @TODO: stb_vorbis_seek_start expects first_audio_page_offset to point to a page
|
|
// without PAGEFLAG_continued_packet, so this either points to the first page, or
|
|
// the page after the end of the headers. It might be cleaner to point to a page
|
|
// in the middle of the headers, when that's the page where the first audio packet
|
|
// starts, but we'd have to also correctly skip the end of any continued packet in
|
|
// stb_vorbis_seek_start.
|
|
if (f->next_seg == -1) {
|
|
f->first_audio_page_offset = stb_vorbis_get_file_offset(f);
|
|
} else {
|
|
f->first_audio_page_offset = 0;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static void vorbis_deinit(stb_vorbis *p)
|
|
{
|
|
int i,j;
|
|
|
|
setup_free(p, p->vendor);
|
|
for (i=0; i < p->comment_list_length; ++i) {
|
|
setup_free(p, p->comment_list[i]);
|
|
}
|
|
setup_free(p, p->comment_list);
|
|
|
|
if (p->residue_config) {
|
|
for (i=0; i < p->residue_count; ++i) {
|
|
Residue *r = p->residue_config+i;
|
|
if (r->classdata) {
|
|
for (j=0; j < p->codebooks[r->classbook].entries; ++j)
|
|
setup_free(p, r->classdata[j]);
|
|
setup_free(p, r->classdata);
|
|
}
|
|
setup_free(p, r->residue_books);
|
|
}
|
|
}
|
|
|
|
if (p->codebooks) {
|
|
CHECK(p);
|
|
for (i=0; i < p->codebook_count; ++i) {
|
|
Codebook *c = p->codebooks + i;
|
|
setup_free(p, c->codeword_lengths);
|
|
setup_free(p, c->multiplicands);
|
|
setup_free(p, c->codewords);
|
|
setup_free(p, c->sorted_codewords);
|
|
// c->sorted_values[-1] is the first entry in the array
|
|
setup_free(p, c->sorted_values ? c->sorted_values-1 : NULL);
|
|
}
|
|
setup_free(p, p->codebooks);
|
|
}
|
|
setup_free(p, p->floor_config);
|
|
setup_free(p, p->residue_config);
|
|
if (p->mapping) {
|
|
for (i=0; i < p->mapping_count; ++i)
|
|
setup_free(p, p->mapping[i].chan);
|
|
setup_free(p, p->mapping);
|
|
}
|
|
CHECK(p);
|
|
for (i=0; i < p->channels && i < STB_VORBIS_MAX_CHANNELS; ++i) {
|
|
setup_free(p, p->channel_buffers[i]);
|
|
setup_free(p, p->previous_window[i]);
|
|
#ifdef STB_VORBIS_NO_DEFER_FLOOR
|
|
setup_free(p, p->floor_buffers[i]);
|
|
#endif
|
|
setup_free(p, p->finalY[i]);
|
|
}
|
|
for (i=0; i < 2; ++i) {
|
|
setup_free(p, p->A[i]);
|
|
setup_free(p, p->B[i]);
|
|
setup_free(p, p->C[i]);
|
|
setup_free(p, p->window[i]);
|
|
setup_free(p, p->bit_reverse[i]);
|
|
}
|
|
#ifndef STB_VORBIS_NO_STDIO
|
|
if (p->close_on_free) fclose(p->f);
|
|
#endif
|
|
}
|
|
|
|
void stb_vorbis_close(stb_vorbis *p)
|
|
{
|
|
if (p == NULL) return;
|
|
vorbis_deinit(p);
|
|
setup_free(p,p);
|
|
}
|
|
|
|
static void vorbis_init(stb_vorbis *p, const stb_vorbis_alloc *z)
|
|
{
|
|
memset(p, 0, sizeof(*p)); // NULL out all malloc'd pointers to start
|
|
if (z) {
|
|
p->alloc = *z;
|
|
p->alloc.alloc_buffer_length_in_bytes = (p->alloc.alloc_buffer_length_in_bytes+3) & ~3;
|
|
p->temp_offset = p->alloc.alloc_buffer_length_in_bytes;
|
|
}
|
|
p->eof = 0;
|
|
p->error = VORBIS__no_error;
|
|
p->stream = NULL;
|
|
p->codebooks = NULL;
|
|
p->page_crc_tests = -1;
|
|
#ifndef STB_VORBIS_NO_STDIO
|
|
p->close_on_free = FALSE;
|
|
p->f = NULL;
|
|
#endif
|
|
}
|
|
|
|
int stb_vorbis_get_sample_offset(stb_vorbis *f)
|
|
{
|
|
if (f->current_loc_valid)
|
|
return f->current_loc;
|
|
else
|
|
return -1;
|
|
}
|
|
|
|
stb_vorbis_info stb_vorbis_get_info(stb_vorbis *f)
|
|
{
|
|
stb_vorbis_info d;
|
|
d.channels = f->channels;
|
|
d.sample_rate = f->sample_rate;
|
|
d.setup_memory_required = f->setup_memory_required;
|
|
d.setup_temp_memory_required = f->setup_temp_memory_required;
|
|
d.temp_memory_required = f->temp_memory_required;
|
|
d.max_frame_size = f->blocksize_1 >> 1;
|
|
return d;
|
|
}
|
|
|
|
stb_vorbis_comment stb_vorbis_get_comment(stb_vorbis *f)
|
|
{
|
|
stb_vorbis_comment d;
|
|
d.vendor = f->vendor;
|
|
d.comment_list_length = f->comment_list_length;
|
|
d.comment_list = f->comment_list;
|
|
return d;
|
|
}
|
|
|
|
int stb_vorbis_get_error(stb_vorbis *f)
|
|
{
|
|
int e = f->error;
|
|
f->error = VORBIS__no_error;
|
|
return e;
|
|
}
|
|
|
|
static stb_vorbis * vorbis_alloc(stb_vorbis *f)
|
|
{
|
|
stb_vorbis *p = (stb_vorbis *) setup_malloc(f, sizeof(*p));
|
|
return p;
|
|
}
|
|
|
|
#ifndef STB_VORBIS_NO_PUSHDATA_API
|
|
|
|
void stb_vorbis_flush_pushdata(stb_vorbis *f)
|
|
{
|
|
f->previous_length = 0;
|
|
f->page_crc_tests = 0;
|
|
f->discard_samples_deferred = 0;
|
|
f->current_loc_valid = FALSE;
|
|
f->first_decode = FALSE;
|
|
f->samples_output = 0;
|
|
f->channel_buffer_start = 0;
|
|
f->channel_buffer_end = 0;
|
|
}
|
|
|
|
static int vorbis_search_for_page_pushdata(vorb *f, uint8 *data, int data_len)
|
|
{
|
|
int i,n;
|
|
for (i=0; i < f->page_crc_tests; ++i)
|
|
f->scan[i].bytes_done = 0;
|
|
|
|
// if we have room for more scans, search for them first, because
|
|
// they may cause us to stop early if their header is incomplete
|
|
if (f->page_crc_tests < STB_VORBIS_PUSHDATA_CRC_COUNT) {
|
|
if (data_len < 4) return 0;
|
|
data_len -= 3; // need to look for 4-byte sequence, so don't miss
|
|
// one that straddles a boundary
|
|
for (i=0; i < data_len; ++i) {
|
|
if (data[i] == 0x4f) {
|
|
if (0==memcmp(data+i, ogg_page_header, 4)) {
|
|
int j,len;
|
|
uint32 crc;
|
|
// make sure we have the whole page header
|
|
if (i+26 >= data_len || i+27+data[i+26] >= data_len) {
|
|
// only read up to this page start, so hopefully we'll
|
|
// have the whole page header start next time
|
|
data_len = i;
|
|
break;
|
|
}
|
|
// ok, we have it all; compute the length of the page
|
|
len = 27 + data[i+26];
|
|
for (j=0; j < data[i+26]; ++j)
|
|
len += data[i+27+j];
|
|
// scan everything up to the embedded crc (which we must 0)
|
|
crc = 0;
|
|
for (j=0; j < 22; ++j)
|
|
crc = crc32_update(crc, data[i+j]);
|
|
// now process 4 0-bytes
|
|
for ( ; j < 26; ++j)
|
|
crc = crc32_update(crc, 0);
|
|
// len is the total number of bytes we need to scan
|
|
n = f->page_crc_tests++;
|
|
f->scan[n].bytes_left = len-j;
|
|
f->scan[n].crc_so_far = crc;
|
|
f->scan[n].goal_crc = data[i+22] + (data[i+23] << 8) + (data[i+24]<<16) + (data[i+25]<<24);
|
|
// if the last frame on a page is continued to the next, then
|
|
// we can't recover the sample_loc immediately
|
|
if (data[i+27+data[i+26]-1] == 255)
|
|
f->scan[n].sample_loc = ~0;
|
|
else
|
|
f->scan[n].sample_loc = data[i+6] + (data[i+7] << 8) + (data[i+ 8]<<16) + (data[i+ 9]<<24);
|
|
f->scan[n].bytes_done = i+j;
|
|
if (f->page_crc_tests == STB_VORBIS_PUSHDATA_CRC_COUNT)
|
|
break;
|
|
// keep going if we still have room for more
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
for (i=0; i < f->page_crc_tests;) {
|
|
uint32 crc;
|
|
int j;
|
|
int n = f->scan[i].bytes_done;
|
|
int m = f->scan[i].bytes_left;
|
|
if (m > data_len - n) m = data_len - n;
|
|
// m is the bytes to scan in the current chunk
|
|
crc = f->scan[i].crc_so_far;
|
|
for (j=0; j < m; ++j)
|
|
crc = crc32_update(crc, data[n+j]);
|
|
f->scan[i].bytes_left -= m;
|
|
f->scan[i].crc_so_far = crc;
|
|
if (f->scan[i].bytes_left == 0) {
|
|
// does it match?
|
|
if (f->scan[i].crc_so_far == f->scan[i].goal_crc) {
|
|
// Houston, we have page
|
|
data_len = n+m; // consumption amount is wherever that scan ended
|
|
f->page_crc_tests = -1; // drop out of page scan mode
|
|
f->previous_length = 0; // decode-but-don't-output one frame
|
|
f->next_seg = -1; // start a new page
|
|
f->current_loc = f->scan[i].sample_loc; // set the current sample location
|
|
// to the amount we'd have decoded had we decoded this page
|
|
f->current_loc_valid = f->current_loc != ~0U;
|
|
return data_len;
|
|
}
|
|
// delete entry
|
|
f->scan[i] = f->scan[--f->page_crc_tests];
|
|
} else {
|
|
++i;
|
|
}
|
|
}
|
|
|
|
return data_len;
|
|
}
|
|
|
|
// return value: number of bytes we used
|
|
int stb_vorbis_decode_frame_pushdata(
|
|
stb_vorbis *f, // the file we're decoding
|
|
const uint8 *data, int data_len, // the memory available for decoding
|
|
int *channels, // place to write number of float * buffers
|
|
float ***output, // place to write float ** array of float * buffers
|
|
int *samples // place to write number of output samples
|
|
)
|
|
{
|
|
int i;
|
|
int len,right,left;
|
|
|
|
if (!IS_PUSH_MODE(f)) return error(f, VORBIS_invalid_api_mixing);
|
|
|
|
if (f->page_crc_tests >= 0) {
|
|
*samples = 0;
|
|
return vorbis_search_for_page_pushdata(f, (uint8 *) data, data_len);
|
|
}
|
|
|
|
f->stream = (uint8 *) data;
|
|
f->stream_end = (uint8 *) data + data_len;
|
|
f->error = VORBIS__no_error;
|
|
|
|
// check that we have the entire packet in memory
|
|
if (!is_whole_packet_present(f)) {
|
|
*samples = 0;
|
|
return 0;
|
|
}
|
|
|
|
if (!vorbis_decode_packet(f, &len, &left, &right)) {
|
|
// save the actual error we encountered
|
|
enum STBVorbisError error = f->error;
|
|
if (error == VORBIS_bad_packet_type) {
|
|
// flush and resynch
|
|
f->error = VORBIS__no_error;
|
|
while (get8_packet(f) != EOP)
|
|
if (f->eof) break;
|
|
*samples = 0;
|
|
return (int) (f->stream - data);
|
|
}
|
|
if (error == VORBIS_continued_packet_flag_invalid) {
|
|
if (f->previous_length == 0) {
|
|
// we may be resynching, in which case it's ok to hit one
|
|
// of these; just discard the packet
|
|
f->error = VORBIS__no_error;
|
|
while (get8_packet(f) != EOP)
|
|
if (f->eof) break;
|
|
*samples = 0;
|
|
return (int) (f->stream - data);
|
|
}
|
|
}
|
|
// if we get an error while parsing, what to do?
|
|
// well, it DEFINITELY won't work to continue from where we are!
|
|
stb_vorbis_flush_pushdata(f);
|
|
// restore the error that actually made us bail
|
|
f->error = error;
|
|
*samples = 0;
|
|
return 1;
|
|
}
|
|
|
|
// success!
|
|
len = vorbis_finish_frame(f, len, left, right);
|
|
for (i=0; i < f->channels; ++i)
|
|
f->outputs[i] = f->channel_buffers[i] + left;
|
|
|
|
if (channels) *channels = f->channels;
|
|
*samples = len;
|
|
*output = f->outputs;
|
|
return (int) (f->stream - data);
|
|
}
|
|
|
|
stb_vorbis *stb_vorbis_open_pushdata(
|
|
const unsigned char *data, int data_len, // the memory available for decoding
|
|
int *data_used, // only defined if result is not NULL
|
|
int *error, const stb_vorbis_alloc *alloc)
|
|
{
|
|
stb_vorbis *f, p;
|
|
vorbis_init(&p, alloc);
|
|
p.stream = (uint8 *) data;
|
|
p.stream_end = (uint8 *) data + data_len;
|
|
p.push_mode = TRUE;
|
|
if (!start_decoder(&p)) {
|
|
if (p.eof)
|
|
*error = VORBIS_need_more_data;
|
|
else
|
|
*error = p.error;
|
|
return NULL;
|
|
}
|
|
f = vorbis_alloc(&p);
|
|
if (f) {
|
|
*f = p;
|
|
*data_used = (int) (f->stream - data);
|
|
*error = 0;
|
|
return f;
|
|
} else {
|
|
vorbis_deinit(&p);
|
|
return NULL;
|
|
}
|
|
}
|
|
#endif // STB_VORBIS_NO_PUSHDATA_API
|
|
|
|
unsigned int stb_vorbis_get_file_offset(stb_vorbis *f)
|
|
{
|
|
#ifndef STB_VORBIS_NO_PUSHDATA_API
|
|
if (f->push_mode) return 0;
|
|
#endif
|
|
if (USE_MEMORY(f)) return (unsigned int) (f->stream - f->stream_start);
|
|
#ifndef STB_VORBIS_NO_STDIO
|
|
return (unsigned int) (ftell(f->f) - f->f_start);
|
|
#endif
|
|
}
|
|
|
|
#ifndef STB_VORBIS_NO_PULLDATA_API
|
|
//
|
|
// DATA-PULLING API
|
|
//
|
|
|
|
static uint32 vorbis_find_page(stb_vorbis *f, uint32 *end, uint32 *last)
|
|
{
|
|
for(;;) {
|
|
int n;
|
|
if (f->eof) return 0;
|
|
n = get8(f);
|
|
if (n == 0x4f) { // page header candidate
|
|
unsigned int retry_loc = stb_vorbis_get_file_offset(f);
|
|
int i;
|
|
// check if we're off the end of a file_section stream
|
|
if (retry_loc - 25 > f->stream_len)
|
|
return 0;
|
|
// check the rest of the header
|
|
for (i=1; i < 4; ++i)
|
|
if (get8(f) != ogg_page_header[i])
|
|
break;
|
|
if (f->eof) return 0;
|
|
if (i == 4) {
|
|
uint8 header[27];
|
|
uint32 i, crc, goal, len;
|
|
for (i=0; i < 4; ++i)
|
|
header[i] = ogg_page_header[i];
|
|
for (; i < 27; ++i)
|
|
header[i] = get8(f);
|
|
if (f->eof) return 0;
|
|
if (header[4] != 0) goto invalid;
|
|
goal = header[22] + (header[23] << 8) + (header[24]<<16) + (header[25]<<24);
|
|
for (i=22; i < 26; ++i)
|
|
header[i] = 0;
|
|
crc = 0;
|
|
for (i=0; i < 27; ++i)
|
|
crc = crc32_update(crc, header[i]);
|
|
len = 0;
|
|
for (i=0; i < header[26]; ++i) {
|
|
int s = get8(f);
|
|
crc = crc32_update(crc, s);
|
|
len += s;
|
|
}
|
|
if (len && f->eof) return 0;
|
|
for (i=0; i < len; ++i)
|
|
crc = crc32_update(crc, get8(f));
|
|
// finished parsing probable page
|
|
if (crc == goal) {
|
|
// we could now check that it's either got the last
|
|
// page flag set, OR it's followed by the capture
|
|
// pattern, but I guess TECHNICALLY you could have
|
|
// a file with garbage between each ogg page and recover
|
|
// from it automatically? So even though that paranoia
|
|
// might decrease the chance of an invalid decode by
|
|
// another 2^32, not worth it since it would hose those
|
|
// invalid-but-useful files?
|
|
if (end)
|
|
*end = stb_vorbis_get_file_offset(f);
|
|
if (last) {
|
|
if (header[5] & 0x04)
|
|
*last = 1;
|
|
else
|
|
*last = 0;
|
|
}
|
|
set_file_offset(f, retry_loc-1);
|
|
return 1;
|
|
}
|
|
}
|
|
invalid:
|
|
// not a valid page, so rewind and look for next one
|
|
set_file_offset(f, retry_loc);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
#define SAMPLE_unknown 0xffffffff
|
|
|
|
// seeking is implemented with a binary search, which narrows down the range to
|
|
// 64K, before using a linear search (because finding the synchronization
|
|
// pattern can be expensive, and the chance we'd find the end page again is
|
|
// relatively high for small ranges)
|
|
//
|
|
// two initial interpolation-style probes are used at the start of the search
|
|
// to try to bound either side of the binary search sensibly, while still
|
|
// working in O(log n) time if they fail.
|
|
|
|
static int get_seek_page_info(stb_vorbis *f, ProbedPage *z)
|
|
{
|
|
uint8 header[27], lacing[255];
|
|
int i,len;
|
|
|
|
// record where the page starts
|
|
z->page_start = stb_vorbis_get_file_offset(f);
|
|
|
|
// parse the header
|
|
getn(f, header, 27);
|
|
if (header[0] != 'O' || header[1] != 'g' || header[2] != 'g' || header[3] != 'S')
|
|
return 0;
|
|
getn(f, lacing, header[26]);
|
|
|
|
// determine the length of the payload
|
|
len = 0;
|
|
for (i=0; i < header[26]; ++i)
|
|
len += lacing[i];
|
|
|
|
// this implies where the page ends
|
|
z->page_end = z->page_start + 27 + header[26] + len;
|
|
|
|
// read the last-decoded sample out of the data
|
|
z->last_decoded_sample = header[6] + (header[7] << 8) + (header[8] << 16) + (header[9] << 24);
|
|
|
|
// restore file state to where we were
|
|
set_file_offset(f, z->page_start);
|
|
return 1;
|
|
}
|
|
|
|
// rarely used function to seek back to the preceding page while finding the
|
|
// start of a packet
|
|
static int go_to_page_before(stb_vorbis *f, unsigned int limit_offset)
|
|
{
|
|
unsigned int previous_safe, end;
|
|
|
|
// now we want to seek back 64K from the limit
|
|
if (limit_offset >= 65536 && limit_offset-65536 >= f->first_audio_page_offset)
|
|
previous_safe = limit_offset - 65536;
|
|
else
|
|
previous_safe = f->first_audio_page_offset;
|
|
|
|
set_file_offset(f, previous_safe);
|
|
|
|
while (vorbis_find_page(f, &end, NULL)) {
|
|
if (end >= limit_offset && stb_vorbis_get_file_offset(f) < limit_offset)
|
|
return 1;
|
|
set_file_offset(f, end);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
// implements the search logic for finding a page and starting decoding. if
|
|
// the function succeeds, current_loc_valid will be true and current_loc will
|
|
// be less than or equal to the provided sample number (the closer the
|
|
// better).
|
|
static int seek_to_sample_coarse(stb_vorbis *f, uint32 sample_number)
|
|
{
|
|
ProbedPage left, right, mid;
|
|
int i, start_seg_with_known_loc, end_pos, page_start;
|
|
uint32 delta, stream_length, padding, last_sample_limit;
|
|
double offset = 0.0, bytes_per_sample = 0.0;
|
|
int probe = 0;
|
|
|
|
// find the last page and validate the target sample
|
|
stream_length = stb_vorbis_stream_length_in_samples(f);
|
|
if (stream_length == 0) return error(f, VORBIS_seek_without_length);
|
|
if (sample_number > stream_length) return error(f, VORBIS_seek_invalid);
|
|
|
|
// this is the maximum difference between the window-center (which is the
|
|
// actual granule position value), and the right-start (which the spec
|
|
// indicates should be the granule position (give or take one)).
|
|
padding = ((f->blocksize_1 - f->blocksize_0) >> 2);
|
|
if (sample_number < padding)
|
|
last_sample_limit = 0;
|
|
else
|
|
last_sample_limit = sample_number - padding;
|
|
|
|
left = f->p_first;
|
|
while (left.last_decoded_sample == ~0U) {
|
|
// (untested) the first page does not have a 'last_decoded_sample'
|
|
set_file_offset(f, left.page_end);
|
|
if (!get_seek_page_info(f, &left)) goto error;
|
|
}
|
|
|
|
right = f->p_last;
|
|
assert(right.last_decoded_sample != ~0U);
|
|
|
|
// starting from the start is handled differently
|
|
if (last_sample_limit <= left.last_decoded_sample) {
|
|
if (stb_vorbis_seek_start(f)) {
|
|
if (f->current_loc > sample_number)
|
|
return error(f, VORBIS_seek_failed);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
while (left.page_end != right.page_start) {
|
|
assert(left.page_end < right.page_start);
|
|
// search range in bytes
|
|
delta = right.page_start - left.page_end;
|
|
if (delta <= 65536) {
|
|
// there's only 64K left to search - handle it linearly
|
|
set_file_offset(f, left.page_end);
|
|
} else {
|
|
if (probe < 2) {
|
|
if (probe == 0) {
|
|
// first probe (interpolate)
|
|
double data_bytes = right.page_end - left.page_start;
|
|
bytes_per_sample = data_bytes / right.last_decoded_sample;
|
|
offset = left.page_start + bytes_per_sample * (last_sample_limit - left.last_decoded_sample);
|
|
} else {
|
|
// second probe (try to bound the other side)
|
|
double error = ((double) last_sample_limit - mid.last_decoded_sample) * bytes_per_sample;
|
|
if (error >= 0 && error < 8000) error = 8000;
|
|
if (error < 0 && error > -8000) error = -8000;
|
|
offset += error * 2;
|
|
}
|
|
|
|
// ensure the offset is valid
|
|
if (offset < left.page_end)
|
|
offset = left.page_end;
|
|
if (offset > right.page_start - 65536)
|
|
offset = right.page_start - 65536;
|
|
|
|
set_file_offset(f, (unsigned int) offset);
|
|
} else {
|
|
// binary search for large ranges (offset by 32K to ensure
|
|
// we don't hit the right page)
|
|
set_file_offset(f, left.page_end + (delta / 2) - 32768);
|
|
}
|
|
|
|
if (!vorbis_find_page(f, NULL, NULL)) goto error;
|
|
}
|
|
|
|
for (;;) {
|
|
if (!get_seek_page_info(f, &mid)) goto error;
|
|
if (mid.last_decoded_sample != ~0U) break;
|
|
// (untested) no frames end on this page
|
|
set_file_offset(f, mid.page_end);
|
|
assert(mid.page_start < right.page_start);
|
|
}
|
|
|
|
// if we've just found the last page again then we're in a tricky file,
|
|
// and we're close enough (if it wasn't an interpolation probe).
|
|
if (mid.page_start == right.page_start) {
|
|
if (probe >= 2 || delta <= 65536)
|
|
break;
|
|
} else {
|
|
if (last_sample_limit < mid.last_decoded_sample)
|
|
right = mid;
|
|
else
|
|
left = mid;
|
|
}
|
|
|
|
++probe;
|
|
}
|
|
|
|
// seek back to start of the last packet
|
|
page_start = left.page_start;
|
|
set_file_offset(f, page_start);
|
|
if (!start_page(f)) return error(f, VORBIS_seek_failed);
|
|
end_pos = f->end_seg_with_known_loc;
|
|
assert(end_pos >= 0);
|
|
|
|
for (;;) {
|
|
for (i = end_pos; i > 0; --i)
|
|
if (f->segments[i-1] != 255)
|
|
break;
|
|
|
|
start_seg_with_known_loc = i;
|
|
|
|
if (start_seg_with_known_loc > 0 || !(f->page_flag & PAGEFLAG_continued_packet))
|
|
break;
|
|
|
|
// (untested) the final packet begins on an earlier page
|
|
if (!go_to_page_before(f, page_start))
|
|
goto error;
|
|
|
|
page_start = stb_vorbis_get_file_offset(f);
|
|
if (!start_page(f)) goto error;
|
|
end_pos = f->segment_count - 1;
|
|
}
|
|
|
|
// prepare to start decoding
|
|
f->current_loc_valid = FALSE;
|
|
f->last_seg = FALSE;
|
|
f->valid_bits = 0;
|
|
f->packet_bytes = 0;
|
|
f->bytes_in_seg = 0;
|
|
f->previous_length = 0;
|
|
f->next_seg = start_seg_with_known_loc;
|
|
|
|
for (i = 0; i < start_seg_with_known_loc; i++)
|
|
skip(f, f->segments[i]);
|
|
|
|
// start decoding (optimizable - this frame is generally discarded)
|
|
if (!vorbis_pump_first_frame(f))
|
|
return 0;
|
|
if (f->current_loc > sample_number)
|
|
return error(f, VORBIS_seek_failed);
|
|
return 1;
|
|
|
|
error:
|
|
// try to restore the file to a valid state
|
|
stb_vorbis_seek_start(f);
|
|
return error(f, VORBIS_seek_failed);
|
|
}
|
|
|
|
// the same as vorbis_decode_initial, but without advancing
|
|
static int peek_decode_initial(vorb *f, int *p_left_start, int *p_left_end, int *p_right_start, int *p_right_end, int *mode)
|
|
{
|
|
int bits_read, bytes_read;
|
|
|
|
if (!vorbis_decode_initial(f, p_left_start, p_left_end, p_right_start, p_right_end, mode))
|
|
return 0;
|
|
|
|
// either 1 or 2 bytes were read, figure out which so we can rewind
|
|
bits_read = 1 + ilog(f->mode_count-1);
|
|
if (f->mode_config[*mode].blockflag)
|
|
bits_read += 2;
|
|
bytes_read = (bits_read + 7) / 8;
|
|
|
|
f->bytes_in_seg += bytes_read;
|
|
f->packet_bytes -= bytes_read;
|
|
skip(f, -bytes_read);
|
|
if (f->next_seg == -1)
|
|
f->next_seg = f->segment_count - 1;
|
|
else
|
|
f->next_seg--;
|
|
f->valid_bits = 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
int stb_vorbis_seek_frame(stb_vorbis *f, unsigned int sample_number)
|
|
{
|
|
uint32 max_frame_samples;
|
|
|
|
if (IS_PUSH_MODE(f)) return error(f, VORBIS_invalid_api_mixing);
|
|
|
|
// fast page-level search
|
|
if (!seek_to_sample_coarse(f, sample_number))
|
|
return 0;
|
|
|
|
assert(f->current_loc_valid);
|
|
assert(f->current_loc <= sample_number);
|
|
|
|
// linear search for the relevant packet
|
|
max_frame_samples = (f->blocksize_1*3 - f->blocksize_0) >> 2;
|
|
while (f->current_loc < sample_number) {
|
|
int left_start, left_end, right_start, right_end, mode, frame_samples;
|
|
if (!peek_decode_initial(f, &left_start, &left_end, &right_start, &right_end, &mode))
|
|
return error(f, VORBIS_seek_failed);
|
|
// calculate the number of samples returned by the next frame
|
|
frame_samples = right_start - left_start;
|
|
if (f->current_loc + frame_samples > sample_number) {
|
|
return 1; // the next frame will contain the sample
|
|
} else if (f->current_loc + frame_samples + max_frame_samples > sample_number) {
|
|
// there's a chance the frame after this could contain the sample
|
|
vorbis_pump_first_frame(f);
|
|
} else {
|
|
// this frame is too early to be relevant
|
|
f->current_loc += frame_samples;
|
|
f->previous_length = 0;
|
|
maybe_start_packet(f);
|
|
flush_packet(f);
|
|
}
|
|
}
|
|
// the next frame should start with the sample
|
|
if (f->current_loc != sample_number) return error(f, VORBIS_seek_failed);
|
|
return 1;
|
|
}
|
|
|
|
int stb_vorbis_seek(stb_vorbis *f, unsigned int sample_number)
|
|
{
|
|
if (!stb_vorbis_seek_frame(f, sample_number))
|
|
return 0;
|
|
|
|
if (sample_number != f->current_loc) {
|
|
int n;
|
|
uint32 frame_start = f->current_loc;
|
|
stb_vorbis_get_frame_float(f, &n, NULL);
|
|
assert(sample_number > frame_start);
|
|
assert(f->channel_buffer_start + (int) (sample_number-frame_start) <= f->channel_buffer_end);
|
|
f->channel_buffer_start += (sample_number - frame_start);
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
int stb_vorbis_seek_start(stb_vorbis *f)
|
|
{
|
|
if (IS_PUSH_MODE(f)) { return error(f, VORBIS_invalid_api_mixing); }
|
|
set_file_offset(f, f->first_audio_page_offset);
|
|
f->previous_length = 0;
|
|
f->first_decode = TRUE;
|
|
f->next_seg = -1;
|
|
return vorbis_pump_first_frame(f);
|
|
}
|
|
|
|
unsigned int stb_vorbis_stream_length_in_samples(stb_vorbis *f)
|
|
{
|
|
unsigned int restore_offset, previous_safe;
|
|
unsigned int end, last_page_loc;
|
|
|
|
if (IS_PUSH_MODE(f)) return error(f, VORBIS_invalid_api_mixing);
|
|
if (!f->total_samples) {
|
|
unsigned int last;
|
|
uint32 lo,hi;
|
|
char header[6];
|
|
|
|
// first, store the current decode position so we can restore it
|
|
restore_offset = stb_vorbis_get_file_offset(f);
|
|
|
|
// now we want to seek back 64K from the end (the last page must
|
|
// be at most a little less than 64K, but let's allow a little slop)
|
|
if (f->stream_len >= 65536 && f->stream_len-65536 >= f->first_audio_page_offset)
|
|
previous_safe = f->stream_len - 65536;
|
|
else
|
|
previous_safe = f->first_audio_page_offset;
|
|
|
|
set_file_offset(f, previous_safe);
|
|
// previous_safe is now our candidate 'earliest known place that seeking
|
|
// to will lead to the final page'
|
|
|
|
if (!vorbis_find_page(f, &end, &last)) {
|
|
// if we can't find a page, we're hosed!
|
|
f->error = VORBIS_cant_find_last_page;
|
|
f->total_samples = 0xffffffff;
|
|
goto done;
|
|
}
|
|
|
|
// check if there are more pages
|
|
last_page_loc = stb_vorbis_get_file_offset(f);
|
|
|
|
// stop when the last_page flag is set, not when we reach eof;
|
|
// this allows us to stop short of a 'file_section' end without
|
|
// explicitly checking the length of the section
|
|
while (!last) {
|
|
set_file_offset(f, end);
|
|
if (!vorbis_find_page(f, &end, &last)) {
|
|
// the last page we found didn't have the 'last page' flag
|
|
// set. whoops!
|
|
break;
|
|
}
|
|
previous_safe = last_page_loc+1;
|
|
last_page_loc = stb_vorbis_get_file_offset(f);
|
|
}
|
|
|
|
set_file_offset(f, last_page_loc);
|
|
|
|
// parse the header
|
|
getn(f, (unsigned char *)header, 6);
|
|
// extract the absolute granule position
|
|
lo = get32(f);
|
|
hi = get32(f);
|
|
if (lo == 0xffffffff && hi == 0xffffffff) {
|
|
f->error = VORBIS_cant_find_last_page;
|
|
f->total_samples = SAMPLE_unknown;
|
|
goto done;
|
|
}
|
|
if (hi)
|
|
lo = 0xfffffffe; // saturate
|
|
f->total_samples = lo;
|
|
|
|
f->p_last.page_start = last_page_loc;
|
|
f->p_last.page_end = end;
|
|
f->p_last.last_decoded_sample = lo;
|
|
|
|
done:
|
|
set_file_offset(f, restore_offset);
|
|
}
|
|
return f->total_samples == SAMPLE_unknown ? 0 : f->total_samples;
|
|
}
|
|
|
|
float stb_vorbis_stream_length_in_seconds(stb_vorbis *f)
|
|
{
|
|
return stb_vorbis_stream_length_in_samples(f) / (float) f->sample_rate;
|
|
}
|
|
|
|
|
|
|
|
int stb_vorbis_get_frame_float(stb_vorbis *f, int *channels, float ***output)
|
|
{
|
|
int len, right,left,i;
|
|
if (IS_PUSH_MODE(f)) return error(f, VORBIS_invalid_api_mixing);
|
|
|
|
if (!vorbis_decode_packet(f, &len, &left, &right)) {
|
|
f->channel_buffer_start = f->channel_buffer_end = 0;
|
|
return 0;
|
|
}
|
|
|
|
len = vorbis_finish_frame(f, len, left, right);
|
|
for (i=0; i < f->channels; ++i)
|
|
f->outputs[i] = f->channel_buffers[i] + left;
|
|
|
|
f->channel_buffer_start = left;
|
|
f->channel_buffer_end = left+len;
|
|
|
|
if (channels) *channels = f->channels;
|
|
if (output) *output = f->outputs;
|
|
return len;
|
|
}
|
|
|
|
#ifndef STB_VORBIS_NO_STDIO
|
|
|
|
stb_vorbis * stb_vorbis_open_file_section(FILE *file, int close_on_free, int *error, const stb_vorbis_alloc *alloc, unsigned int length)
|
|
{
|
|
stb_vorbis *f, p;
|
|
vorbis_init(&p, alloc);
|
|
p.f = file;
|
|
p.f_start = (uint32) ftell(file);
|
|
p.stream_len = length;
|
|
p.close_on_free = close_on_free;
|
|
if (start_decoder(&p)) {
|
|
f = vorbis_alloc(&p);
|
|
if (f) {
|
|
*f = p;
|
|
vorbis_pump_first_frame(f);
|
|
return f;
|
|
}
|
|
}
|
|
if (error) *error = p.error;
|
|
vorbis_deinit(&p);
|
|
return NULL;
|
|
}
|
|
|
|
stb_vorbis * stb_vorbis_open_file(FILE *file, int close_on_free, int *error, const stb_vorbis_alloc *alloc)
|
|
{
|
|
unsigned int len, start;
|
|
start = (unsigned int) ftell(file);
|
|
fseek(file, 0, SEEK_END);
|
|
len = (unsigned int) (ftell(file) - start);
|
|
fseek(file, start, SEEK_SET);
|
|
return stb_vorbis_open_file_section(file, close_on_free, error, alloc, len);
|
|
}
|
|
|
|
stb_vorbis * stb_vorbis_open_filename(const char *filename, int *error, const stb_vorbis_alloc *alloc)
|
|
{
|
|
FILE *f;
|
|
#if defined(_WIN32) && defined(__STDC_WANT_SECURE_LIB__)
|
|
if (0 != fopen_s(&f, filename, "rb"))
|
|
f = NULL;
|
|
#else
|
|
f = fopen(filename, "rb");
|
|
#endif
|
|
if (f)
|
|
return stb_vorbis_open_file(f, TRUE, error, alloc);
|
|
if (error) *error = VORBIS_file_open_failure;
|
|
return NULL;
|
|
}
|
|
#endif // STB_VORBIS_NO_STDIO
|
|
|
|
stb_vorbis * stb_vorbis_open_memory(const unsigned char *data, int len, int *error, const stb_vorbis_alloc *alloc)
|
|
{
|
|
stb_vorbis *f, p;
|
|
if (data == NULL) return NULL;
|
|
vorbis_init(&p, alloc);
|
|
p.stream = (uint8 *) data;
|
|
p.stream_end = (uint8 *) data + len;
|
|
p.stream_start = (uint8 *) p.stream;
|
|
p.stream_len = len;
|
|
p.push_mode = FALSE;
|
|
if (start_decoder(&p)) {
|
|
f = vorbis_alloc(&p);
|
|
if (f) {
|
|
*f = p;
|
|
vorbis_pump_first_frame(f);
|
|
if (error) *error = VORBIS__no_error;
|
|
return f;
|
|
}
|
|
}
|
|
if (error) *error = p.error;
|
|
vorbis_deinit(&p);
|
|
return NULL;
|
|
}
|
|
|
|
#ifndef STB_VORBIS_NO_INTEGER_CONVERSION
|
|
#define PLAYBACK_MONO 1
|
|
#define PLAYBACK_LEFT 2
|
|
#define PLAYBACK_RIGHT 4
|
|
|
|
#define L (PLAYBACK_LEFT | PLAYBACK_MONO)
|
|
#define C (PLAYBACK_LEFT | PLAYBACK_RIGHT | PLAYBACK_MONO)
|
|
#define R (PLAYBACK_RIGHT | PLAYBACK_MONO)
|
|
|
|
static int8 channel_position[7][6] =
|
|
{
|
|
{ 0 },
|
|
{ C },
|
|
{ L, R },
|
|
{ L, C, R },
|
|
{ L, R, L, R },
|
|
{ L, C, R, L, R },
|
|
{ L, C, R, L, R, C },
|
|
};
|
|
|
|
|
|
#ifndef STB_VORBIS_NO_FAST_SCALED_FLOAT
|
|
typedef union {
|
|
float f;
|
|
int i;
|
|
} float_conv;
|
|
typedef char stb_vorbis_float_size_test[sizeof(float)==4 && sizeof(int) == 4];
|
|
#define FASTDEF(x) float_conv x
|
|
// add (1<<23) to convert to int, then divide by 2^SHIFT, then add 0.5/2^SHIFT to round
|
|
#define MAGIC(SHIFT) (1.5f * (1 << (23-SHIFT)) + 0.5f/(1 << SHIFT))
|
|
#define ADDEND(SHIFT) (((150-SHIFT) << 23) + (1 << 22))
|
|
#define FAST_SCALED_FLOAT_TO_INT(temp,x,s) (temp.f = (x) + MAGIC(s), temp.i - ADDEND(s))
|
|
#define check_endianness()
|
|
#else
|
|
#define FAST_SCALED_FLOAT_TO_INT(temp,x,s) ((int) ((x) * (1 << (s))))
|
|
#define check_endianness()
|
|
#define FASTDEF(x)
|
|
#endif
|
|
|
|
static void copy_samples(short *dest, float *src, int len)
|
|
{
|
|
int i;
|
|
check_endianness();
|
|
for (i=0; i < len; ++i) {
|
|
FASTDEF(temp);
|
|
int v = FAST_SCALED_FLOAT_TO_INT(temp, src[i],15);
|
|
if ((unsigned int) (v + 32768) > 65535)
|
|
v = v < 0 ? -32768 : 32767;
|
|
dest[i] = v;
|
|
}
|
|
}
|
|
|
|
static void compute_samples(int mask, short *output, int num_c, float **data, int d_offset, int len)
|
|
{
|
|
#define BUFFER_SIZE 32
|
|
float buffer[BUFFER_SIZE];
|
|
int i,j,o,n = BUFFER_SIZE;
|
|
check_endianness();
|
|
for (o = 0; o < len; o += BUFFER_SIZE) {
|
|
memset(buffer, 0, sizeof(buffer));
|
|
if (o + n > len) n = len - o;
|
|
for (j=0; j < num_c; ++j) {
|
|
if (channel_position[num_c][j] & mask) {
|
|
for (i=0; i < n; ++i)
|
|
buffer[i] += data[j][d_offset+o+i];
|
|
}
|
|
}
|
|
for (i=0; i < n; ++i) {
|
|
FASTDEF(temp);
|
|
int v = FAST_SCALED_FLOAT_TO_INT(temp,buffer[i],15);
|
|
if ((unsigned int) (v + 32768) > 65535)
|
|
v = v < 0 ? -32768 : 32767;
|
|
output[o+i] = v;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void compute_stereo_samples(short *output, int num_c, float **data, int d_offset, int len)
|
|
{
|
|
#define BUFFER_SIZE 32
|
|
float buffer[BUFFER_SIZE];
|
|
int i,j,o,n = BUFFER_SIZE >> 1;
|
|
// o is the offset in the source data
|
|
check_endianness();
|
|
for (o = 0; o < len; o += BUFFER_SIZE >> 1) {
|
|
// o2 is the offset in the output data
|
|
int o2 = o << 1;
|
|
memset(buffer, 0, sizeof(buffer));
|
|
if (o + n > len) n = len - o;
|
|
for (j=0; j < num_c; ++j) {
|
|
int m = channel_position[num_c][j] & (PLAYBACK_LEFT | PLAYBACK_RIGHT);
|
|
if (m == (PLAYBACK_LEFT | PLAYBACK_RIGHT)) {
|
|
for (i=0; i < n; ++i) {
|
|
buffer[i*2+0] += data[j][d_offset+o+i];
|
|
buffer[i*2+1] += data[j][d_offset+o+i];
|
|
}
|
|
} else if (m == PLAYBACK_LEFT) {
|
|
for (i=0; i < n; ++i) {
|
|
buffer[i*2+0] += data[j][d_offset+o+i];
|
|
}
|
|
} else if (m == PLAYBACK_RIGHT) {
|
|
for (i=0; i < n; ++i) {
|
|
buffer[i*2+1] += data[j][d_offset+o+i];
|
|
}
|
|
}
|
|
}
|
|
for (i=0; i < (n<<1); ++i) {
|
|
FASTDEF(temp);
|
|
int v = FAST_SCALED_FLOAT_TO_INT(temp,buffer[i],15);
|
|
if ((unsigned int) (v + 32768) > 65535)
|
|
v = v < 0 ? -32768 : 32767;
|
|
output[o2+i] = v;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void convert_samples_short(int buf_c, short **buffer, int b_offset, int data_c, float **data, int d_offset, int samples)
|
|
{
|
|
int i;
|
|
if (buf_c != data_c && buf_c <= 2 && data_c <= 6) {
|
|
static int channel_selector[3][2] = { {0}, {PLAYBACK_MONO}, {PLAYBACK_LEFT, PLAYBACK_RIGHT} };
|
|
for (i=0; i < buf_c; ++i)
|
|
compute_samples(channel_selector[buf_c][i], buffer[i]+b_offset, data_c, data, d_offset, samples);
|
|
} else {
|
|
int limit = buf_c < data_c ? buf_c : data_c;
|
|
for (i=0; i < limit; ++i)
|
|
copy_samples(buffer[i]+b_offset, data[i]+d_offset, samples);
|
|
for ( ; i < buf_c; ++i)
|
|
memset(buffer[i]+b_offset, 0, sizeof(short) * samples);
|
|
}
|
|
}
|
|
|
|
int stb_vorbis_get_frame_short(stb_vorbis *f, int num_c, short **buffer, int num_samples)
|
|
{
|
|
float **output = NULL;
|
|
int len = stb_vorbis_get_frame_float(f, NULL, &output);
|
|
if (len > num_samples) len = num_samples;
|
|
if (len)
|
|
convert_samples_short(num_c, buffer, 0, f->channels, output, 0, len);
|
|
return len;
|
|
}
|
|
|
|
static void convert_channels_short_interleaved(int buf_c, short *buffer, int data_c, float **data, int d_offset, int len)
|
|
{
|
|
int i;
|
|
check_endianness();
|
|
if (buf_c != data_c && buf_c <= 2 && data_c <= 6) {
|
|
assert(buf_c == 2);
|
|
for (i=0; i < buf_c; ++i)
|
|
compute_stereo_samples(buffer, data_c, data, d_offset, len);
|
|
} else {
|
|
int limit = buf_c < data_c ? buf_c : data_c;
|
|
int j;
|
|
for (j=0; j < len; ++j) {
|
|
for (i=0; i < limit; ++i) {
|
|
FASTDEF(temp);
|
|
float f = data[i][d_offset+j];
|
|
int v = FAST_SCALED_FLOAT_TO_INT(temp, f,15);//data[i][d_offset+j],15);
|
|
if ((unsigned int) (v + 32768) > 65535)
|
|
v = v < 0 ? -32768 : 32767;
|
|
*buffer++ = v;
|
|
}
|
|
for ( ; i < buf_c; ++i)
|
|
*buffer++ = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
int stb_vorbis_get_frame_short_interleaved(stb_vorbis *f, int num_c, short *buffer, int num_shorts)
|
|
{
|
|
float **output;
|
|
int len;
|
|
if (num_c == 1) return stb_vorbis_get_frame_short(f,num_c,&buffer, num_shorts);
|
|
len = stb_vorbis_get_frame_float(f, NULL, &output);
|
|
if (len) {
|
|
if (len*num_c > num_shorts) len = num_shorts / num_c;
|
|
convert_channels_short_interleaved(num_c, buffer, f->channels, output, 0, len);
|
|
}
|
|
return len;
|
|
}
|
|
|
|
int stb_vorbis_get_samples_short_interleaved(stb_vorbis *f, int channels, short *buffer, int num_shorts)
|
|
{
|
|
float **outputs;
|
|
int len = num_shorts / channels;
|
|
int n=0;
|
|
int z = f->channels;
|
|
if (z > channels) z = channels;
|
|
while (n < len) {
|
|
int k = f->channel_buffer_end - f->channel_buffer_start;
|
|
if (n+k >= len) k = len - n;
|
|
if (k)
|
|
convert_channels_short_interleaved(channels, buffer, f->channels, f->channel_buffers, f->channel_buffer_start, k);
|
|
buffer += k*channels;
|
|
n += k;
|
|
f->channel_buffer_start += k;
|
|
if (n == len) break;
|
|
if (!stb_vorbis_get_frame_float(f, NULL, &outputs)) break;
|
|
}
|
|
return n;
|
|
}
|
|
|
|
int stb_vorbis_get_samples_short(stb_vorbis *f, int channels, short **buffer, int len)
|
|
{
|
|
float **outputs;
|
|
int n=0;
|
|
int z = f->channels;
|
|
if (z > channels) z = channels;
|
|
while (n < len) {
|
|
int k = f->channel_buffer_end - f->channel_buffer_start;
|
|
if (n+k >= len) k = len - n;
|
|
if (k)
|
|
convert_samples_short(channels, buffer, n, f->channels, f->channel_buffers, f->channel_buffer_start, k);
|
|
n += k;
|
|
f->channel_buffer_start += k;
|
|
if (n == len) break;
|
|
if (!stb_vorbis_get_frame_float(f, NULL, &outputs)) break;
|
|
}
|
|
return n;
|
|
}
|
|
|
|
#ifndef STB_VORBIS_NO_STDIO
|
|
int stb_vorbis_decode_filename(const char *filename, int *channels, int *sample_rate, short **output)
|
|
{
|
|
int data_len, offset, total, limit, error;
|
|
short *data;
|
|
stb_vorbis *v = stb_vorbis_open_filename(filename, &error, NULL);
|
|
if (v == NULL) return -1;
|
|
limit = v->channels * 4096;
|
|
*channels = v->channels;
|
|
if (sample_rate)
|
|
*sample_rate = v->sample_rate;
|
|
offset = data_len = 0;
|
|
total = limit;
|
|
data = (short *) malloc(total * sizeof(*data));
|
|
if (data == NULL) {
|
|
stb_vorbis_close(v);
|
|
return -2;
|
|
}
|
|
for (;;) {
|
|
int n = stb_vorbis_get_frame_short_interleaved(v, v->channels, data+offset, total-offset);
|
|
if (n == 0) break;
|
|
data_len += n;
|
|
offset += n * v->channels;
|
|
if (offset + limit > total) {
|
|
short *data2;
|
|
total *= 2;
|
|
data2 = (short *) realloc(data, total * sizeof(*data));
|
|
if (data2 == NULL) {
|
|
free(data);
|
|
stb_vorbis_close(v);
|
|
return -2;
|
|
}
|
|
data = data2;
|
|
}
|
|
}
|
|
*output = data;
|
|
stb_vorbis_close(v);
|
|
return data_len;
|
|
}
|
|
#endif // NO_STDIO
|
|
|
|
int stb_vorbis_decode_memory(const uint8 *mem, int len, int *channels, int *sample_rate, short **output)
|
|
{
|
|
int data_len, offset, total, limit, error;
|
|
short *data;
|
|
stb_vorbis *v = stb_vorbis_open_memory(mem, len, &error, NULL);
|
|
if (v == NULL) return -1;
|
|
limit = v->channels * 4096;
|
|
*channels = v->channels;
|
|
if (sample_rate)
|
|
*sample_rate = v->sample_rate;
|
|
offset = data_len = 0;
|
|
total = limit;
|
|
data = (short *) malloc(total * sizeof(*data));
|
|
if (data == NULL) {
|
|
stb_vorbis_close(v);
|
|
return -2;
|
|
}
|
|
for (;;) {
|
|
int n = stb_vorbis_get_frame_short_interleaved(v, v->channels, data+offset, total-offset);
|
|
if (n == 0) break;
|
|
data_len += n;
|
|
offset += n * v->channels;
|
|
if (offset + limit > total) {
|
|
short *data2;
|
|
total *= 2;
|
|
data2 = (short *) realloc(data, total * sizeof(*data));
|
|
if (data2 == NULL) {
|
|
free(data);
|
|
stb_vorbis_close(v);
|
|
return -2;
|
|
}
|
|
data = data2;
|
|
}
|
|
}
|
|
*output = data;
|
|
stb_vorbis_close(v);
|
|
return data_len;
|
|
}
|
|
#endif // STB_VORBIS_NO_INTEGER_CONVERSION
|
|
|
|
int stb_vorbis_get_samples_float_interleaved(stb_vorbis *f, int channels, float *buffer, int num_floats)
|
|
{
|
|
float **outputs;
|
|
int len = num_floats / channels;
|
|
int n=0;
|
|
int z = f->channels;
|
|
if (z > channels) z = channels;
|
|
while (n < len) {
|
|
int i,j;
|
|
int k = f->channel_buffer_end - f->channel_buffer_start;
|
|
if (n+k >= len) k = len - n;
|
|
for (j=0; j < k; ++j) {
|
|
for (i=0; i < z; ++i)
|
|
*buffer++ = f->channel_buffers[i][f->channel_buffer_start+j];
|
|
for ( ; i < channels; ++i)
|
|
*buffer++ = 0;
|
|
}
|
|
n += k;
|
|
f->channel_buffer_start += k;
|
|
if (n == len)
|
|
break;
|
|
if (!stb_vorbis_get_frame_float(f, NULL, &outputs))
|
|
break;
|
|
}
|
|
return n;
|
|
}
|
|
|
|
int stb_vorbis_get_samples_float(stb_vorbis *f, int channels, float **buffer, int num_samples)
|
|
{
|
|
float **outputs;
|
|
int n=0;
|
|
int z = f->channels;
|
|
if (z > channels) z = channels;
|
|
while (n < num_samples) {
|
|
int i;
|
|
int k = f->channel_buffer_end - f->channel_buffer_start;
|
|
if (n+k >= num_samples) k = num_samples - n;
|
|
if (k) {
|
|
for (i=0; i < z; ++i)
|
|
memcpy(buffer[i]+n, f->channel_buffers[i]+f->channel_buffer_start, sizeof(float)*k);
|
|
for ( ; i < channels; ++i)
|
|
memset(buffer[i]+n, 0, sizeof(float) * k);
|
|
}
|
|
n += k;
|
|
f->channel_buffer_start += k;
|
|
if (n == num_samples)
|
|
break;
|
|
if (!stb_vorbis_get_frame_float(f, NULL, &outputs))
|
|
break;
|
|
}
|
|
return n;
|
|
}
|
|
#endif // STB_VORBIS_NO_PULLDATA_API
|
|
|
|
/* Version history
|
|
1.17 - 2019-07-08 - fix CVE-2019-13217, -13218, -13219, -13220, -13221, -13222, -13223
|
|
found with Mayhem by ForAllSecure
|
|
1.16 - 2019-03-04 - fix warnings
|
|
1.15 - 2019-02-07 - explicit failure if Ogg Skeleton data is found
|
|
1.14 - 2018-02-11 - delete bogus dealloca usage
|
|
1.13 - 2018-01-29 - fix truncation of last frame (hopefully)
|
|
1.12 - 2017-11-21 - limit residue begin/end to blocksize/2 to avoid large temp allocs in bad/corrupt files
|
|
1.11 - 2017-07-23 - fix MinGW compilation
|
|
1.10 - 2017-03-03 - more robust seeking; fix negative ilog(); clear error in open_memory
|
|
1.09 - 2016-04-04 - back out 'avoid discarding last frame' fix from previous version
|
|
1.08 - 2016-04-02 - fixed multiple warnings; fix setup memory leaks;
|
|
avoid discarding last frame of audio data
|
|
1.07 - 2015-01-16 - fixed some warnings, fix mingw, const-correct API
|
|
some more crash fixes when out of memory or with corrupt files
|
|
1.06 - 2015-08-31 - full, correct support for seeking API (Dougall Johnson)
|
|
some crash fixes when out of memory or with corrupt files
|
|
1.05 - 2015-04-19 - don't define __forceinline if it's redundant
|
|
1.04 - 2014-08-27 - fix missing const-correct case in API
|
|
1.03 - 2014-08-07 - Warning fixes
|
|
1.02 - 2014-07-09 - Declare qsort compare function _cdecl on windows
|
|
1.01 - 2014-06-18 - fix stb_vorbis_get_samples_float
|
|
1.0 - 2014-05-26 - fix memory leaks; fix warnings; fix bugs in multichannel
|
|
(API change) report sample rate for decode-full-file funcs
|
|
0.99996 - bracket #include <malloc.h> for macintosh compilation by Laurent Gomila
|
|
0.99995 - use union instead of pointer-cast for fast-float-to-int to avoid alias-optimization problem
|
|
0.99994 - change fast-float-to-int to work in single-precision FPU mode, remove endian-dependence
|
|
0.99993 - remove assert that fired on legal files with empty tables
|
|
0.99992 - rewind-to-start
|
|
0.99991 - bugfix to stb_vorbis_get_samples_short by Bernhard Wodo
|
|
0.9999 - (should have been 0.99990) fix no-CRT support, compiling as C++
|
|
0.9998 - add a full-decode function with a memory source
|
|
0.9997 - fix a bug in the read-from-FILE case in 0.9996 addition
|
|
0.9996 - query length of vorbis stream in samples/seconds
|
|
0.9995 - bugfix to another optimization that only happened in certain files
|
|
0.9994 - bugfix to one of the optimizations that caused significant (but inaudible?) errors
|
|
0.9993 - performance improvements; runs in 99% to 104% of time of reference implementation
|
|
0.9992 - performance improvement of IMDCT; now performs close to reference implementation
|
|
0.9991 - performance improvement of IMDCT
|
|
0.999 - (should have been 0.9990) performance improvement of IMDCT
|
|
0.998 - no-CRT support from Casey Muratori
|
|
0.997 - bugfixes for bugs found by Terje Mathisen
|
|
0.996 - bugfix: fast-huffman decode initialized incorrectly for sparse codebooks; fixing gives 10% speedup - found by Terje Mathisen
|
|
0.995 - bugfix: fix to 'effective' overrun detection - found by Terje Mathisen
|
|
0.994 - bugfix: garbage decode on final VQ symbol of a non-multiple - found by Terje Mathisen
|
|
0.993 - bugfix: pushdata API required 1 extra byte for empty page (failed to consume final page if empty) - found by Terje Mathisen
|
|
0.992 - fixes for MinGW warning
|
|
0.991 - turn fast-float-conversion on by default
|
|
0.990 - fix push-mode seek recovery if you seek into the headers
|
|
0.98b - fix to bad release of 0.98
|
|
0.98 - fix push-mode seek recovery; robustify float-to-int and support non-fast mode
|
|
0.97 - builds under c++ (typecasting, don't use 'class' keyword)
|
|
0.96 - somehow MY 0.95 was right, but the web one was wrong, so here's my 0.95 rereleased as 0.96, fixes a typo in the clamping code
|
|
0.95 - clamping code for 16-bit functions
|
|
0.94 - not publically released
|
|
0.93 - fixed all-zero-floor case (was decoding garbage)
|
|
0.92 - fixed a memory leak
|
|
0.91 - conditional compiles to omit parts of the API and the infrastructure to support them: STB_VORBIS_NO_PULLDATA_API, STB_VORBIS_NO_PUSHDATA_API, STB_VORBIS_NO_STDIO, STB_VORBIS_NO_INTEGER_CONVERSION
|
|
0.90 - first public release
|
|
*/
|
|
|
|
#endif // STB_VORBIS_HEADER_ONLY
|
|
|
|
|
|
/*
|
|
------------------------------------------------------------------------------
|
|
This software is available under 2 licenses -- choose whichever you prefer.
|
|
------------------------------------------------------------------------------
|
|
ALTERNATIVE A - MIT License
|
|
Copyright (c) 2017 Sean Barrett
|
|
Permission is hereby granted, free of charge, to any person obtaining a copy of
|
|
this software and associated documentation files (the "Software"), to deal in
|
|
the Software without restriction, including without limitation the rights to
|
|
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
|
|
of the Software, and to permit persons to whom the Software is furnished to do
|
|
so, subject to the following conditions:
|
|
The above copyright notice and this permission notice shall be included in all
|
|
copies or substantial portions of the Software.
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
SOFTWARE.
|
|
------------------------------------------------------------------------------
|
|
ALTERNATIVE B - Public Domain (www.unlicense.org)
|
|
This is free and unencumbered software released into the public domain.
|
|
Anyone is free to copy, modify, publish, use, compile, sell, or distribute this
|
|
software, either in source code form or as a compiled binary, for any purpose,
|
|
commercial or non-commercial, and by any means.
|
|
In jurisdictions that recognize copyright laws, the author or authors of this
|
|
software dedicate any and all copyright interest in the software to the public
|
|
domain. We make this dedication for the benefit of the public at large and to
|
|
the detriment of our heirs and successors. We intend this dedication to be an
|
|
overt act of relinquishment in perpetuity of all present and future rights to
|
|
this software under copyright law.
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
|
|
ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
|
|
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
------------------------------------------------------------------------------
|
|
*/
|