411 lines
12 KiB
C
411 lines
12 KiB
C
/*
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frame: Central data structures and opmitization hooks.
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copyright 2007 by the mpg123 project - free software under the terms of the LGPL 2.1
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see COPYING and AUTHORS files in distribution or http://mpg123.org
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initially written by Thomas Orgis
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*/
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#ifndef MPG123_FRAME_H
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#define MPG123_FRAME_H
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#include <stdio.h>
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#include "config.h"
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#include "mpg123.h"
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#include "optimize.h"
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#include "id3.h"
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#include "icy.h"
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#include "reader.h"
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#ifdef FRAME_INDEX
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#include "index.h"
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#endif
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#include "synths.h"
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#ifdef OPT_DITHER
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#include "dither.h"
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int frame_dither_init(mpg123_handle *fr);
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#endif
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/* max = 1728 */
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#define MAXFRAMESIZE 3456
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struct al_table
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{
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short bits;
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short d;
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};
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/* the output buffer, used to be pcm_sample, pcm_point and audiobufsize */
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struct outbuffer
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{
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unsigned char *data; /* main data pointer, aligned */
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unsigned char *p; /* read pointer */
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size_t fill; /* fill from read pointer */
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size_t size;
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unsigned char *rdata; /* unaligned base pointer */
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};
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struct audioformat
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{
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int encoding;
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int encsize; /* Size of one sample in bytes, plain int should be fine here... */
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int channels;
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long rate;
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};
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void invalidate_format(struct audioformat *af);
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struct mpg123_pars_struct
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{
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int verbose; /* verbose level */
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long flags; /* combination of above */
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#ifndef NO_NTOM
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long force_rate;
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#endif
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int down_sample;
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int rva; /* (which) rva to do: 0: nothing, 1: radio/mix/track 2: album/audiophile */
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long halfspeed;
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long doublespeed;
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long timeout;
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#define NUM_CHANNELS 2
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char audio_caps[NUM_CHANNELS][MPG123_RATES+1][MPG123_ENCODINGS];
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/* long start_frame; */ /* frame offset to begin with */
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/* long frame_number;*/ /* number of frames to decode */
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#ifndef NO_ICY
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long icy_interval;
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#endif
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double outscale;
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long resync_limit;
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long index_size; /* Long, because: negative values have a meaning. */
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long preframes;
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#ifndef NO_FEEDER
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long feedpool;
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long feedbuffer;
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#endif
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};
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enum frame_state_flags
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{
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FRAME_ACCURATE = 0x1 /**< 0001 Positions are considered accurate. */
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,FRAME_FRANKENSTEIN = 0x2 /**< 0010 This stream is concatenated. */
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};
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/* There is a lot to condense here... many ints can be merged as flags; though the main space is still consumed by buffers. */
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struct mpg123_handle_struct
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{
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int fresh; /* to be moved into flags */
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int new_format;
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real hybrid_block[2][2][SBLIMIT*SSLIMIT];
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int hybrid_blc[2];
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/* the scratch vars for the decoders, sometimes real, sometimes short... sometimes int/long */
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short *short_buffs[2][2];
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real *real_buffs[2][2];
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unsigned char *rawbuffs;
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int rawbuffss;
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#ifdef OPT_I486
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int i486bo[2];
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#endif
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int bo; /* Just have it always here. */
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#ifdef OPT_DITHER
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int ditherindex;
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float *dithernoise;
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#endif
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unsigned char* rawdecwin; /* the block with all decwins */
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int rawdecwins; /* size of rawdecwin memory */
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real *decwin; /* _the_ decode table */
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#ifdef OPT_MMXORSSE
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/* I am not really sure that I need both of them... used in assembler */
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float *decwin_mmx;
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float *decwins;
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#endif
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int have_eq_settings;
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real equalizer[2][32];
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/* for halfspeed mode */
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unsigned char ssave[34];
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int halfphase;
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#ifndef NO_8BIT
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/* a raw buffer and a pointer into the middle for signed short conversion, only allocated on demand */
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unsigned char *conv16to8_buf;
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unsigned char *conv16to8;
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#endif
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/* There's some possible memory saving for stuff that is not _really_ dynamic. */
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/* layer3 */
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int longLimit[9][23];
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int shortLimit[9][14];
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real gainpow2[256+118+4]; /* not really dynamic, just different for mmx */
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/* layer2 */
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real muls[27][64]; /* also used by layer 1 */
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#ifndef NO_NTOM
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/* decode_ntom */
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unsigned long ntom_val[2];
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unsigned long ntom_step;
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#endif
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/* special i486 fun */
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#ifdef OPT_I486
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int *int_buffs[2][2];
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#endif
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/* special altivec... */
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#ifdef OPT_ALTIVEC
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real *areal_buffs[4][4];
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#endif
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struct synth_s synths;
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struct
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{
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#ifdef OPT_MULTI
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#ifndef NO_LAYER3
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#if (defined OPT_3DNOW || defined OPT_3DNOWEXT)
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void (*the_dct36)(real *,real *,real *,real *,real *);
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#endif
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#endif
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#endif
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enum optdec type;
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enum optcla class;
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} cpu_opts;
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int verbose; /* 0: nothing, 1: just print chosen decoder, 2: be verbose */
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const struct al_table *alloc;
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/* The runtime-chosen decoding, based on input and output format. */
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func_synth synth;
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func_synth_stereo synth_stereo;
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func_synth_mono synth_mono;
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/* Yes, this function is runtime-switched, too. */
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void (*make_decode_tables)(mpg123_handle *fr); /* That is the volume control. */
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int stereo; /* I _think_ 1 for mono and 2 for stereo */
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int jsbound;
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#define SINGLE_STEREO -1
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#define SINGLE_LEFT 0
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#define SINGLE_RIGHT 1
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#define SINGLE_MIX 3
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int single;
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int II_sblimit;
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int down_sample_sblimit;
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int lsf; /* 0: MPEG 1.0; 1: MPEG 2.0/2.5 -- both used as bool and array index! */
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/* Many flags in disguise as integers... wasting bytes. */
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int mpeg25;
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int down_sample;
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int header_change;
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int lay;
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int (*do_layer)(mpg123_handle *);
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int error_protection;
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int bitrate_index;
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int sampling_frequency;
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int padding;
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int extension;
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int mode;
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int mode_ext;
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int copyright;
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int original;
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int emphasis;
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int framesize; /* computed framesize */
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int freesize; /* free format frame size */
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enum mpg123_vbr vbr; /* 1 if variable bitrate was detected */
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off_t num; /* frame offset ... */
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off_t input_offset; /* byte offset of this frame in input stream */
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off_t playnum; /* playback offset... includes repetitions, reset at seeks */
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off_t audio_start; /* The byte offset in the file where audio data begins. */
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int state_flags;
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char silent_resync; /* Do not complain for the next n resyncs. */
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unsigned char* xing_toc; /* The seek TOC from Xing header. */
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int freeformat;
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long freeformat_framesize;
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/* bitstream info; bsi */
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int bitindex;
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unsigned char *wordpointer;
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/* temporary storage for getbits stuff */
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unsigned long ultmp;
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unsigned char uctmp;
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/* rva data, used in common.c, set in id3.c */
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double maxoutburst; /* The maximum amplitude in current sample represenation. */
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double lastscale;
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struct
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{
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int level[2];
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float gain[2];
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float peak[2];
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} rva;
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/* input data */
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off_t track_frames;
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off_t track_samples;
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double mean_framesize;
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off_t mean_frames;
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int fsizeold;
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int ssize;
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unsigned int bitreservoir;
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unsigned char bsspace[2][MAXFRAMESIZE+512]; /* MAXFRAMESIZE */
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unsigned char *bsbuf;
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unsigned char *bsbufold;
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int bsnum;
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/* That is the header matching the last read frame body. */
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unsigned long oldhead;
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/* That is the header that is supposedly the first of the stream. */
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unsigned long firsthead;
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int abr_rate;
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#ifdef FRAME_INDEX
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struct frame_index index;
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#endif
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/* output data */
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struct outbuffer buffer;
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struct audioformat af;
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int own_buffer;
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size_t outblock; /* number of bytes that this frame produces (upper bound) */
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int to_decode; /* this frame holds data to be decoded */
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int to_ignore; /* the same, somehow */
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off_t firstframe; /* start decoding from here */
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off_t lastframe; /* last frame to decode (for gapless or num_frames limit) */
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off_t ignoreframe; /* frames to decode but discard before firstframe */
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#ifdef GAPLESS
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off_t gapless_frames; /* frame count for the gapless part */
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off_t firstoff; /* number of samples to ignore from firstframe */
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off_t lastoff; /* number of samples to use from lastframe */
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off_t begin_s; /* overall begin offset in samples */
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off_t begin_os;
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off_t end_s; /* overall end offset in samples */
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off_t end_os;
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off_t fullend_os; /* gapless_frames translated to output samples */
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#endif
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unsigned int crc; /* Well, I need a safe 16bit type, actually. But wider doesn't hurt. */
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struct reader *rd; /* pointer to the reading functions */
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struct reader_data rdat; /* reader data and state info */
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struct mpg123_pars_struct p;
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int err;
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int decoder_change;
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int delayed_change;
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long clip;
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/* the meta crap */
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int metaflags;
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unsigned char id3buf[128];
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#ifndef NO_ID3V2
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mpg123_id3v2 id3v2;
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#endif
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#ifndef NO_ICY
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struct icy_meta icy;
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#endif
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/*
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More variables needed for decoders, layerX.c.
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This time it is not about static variables but about the need for alignment which cannot be guaranteed on the stack by certain compilers (Sun Studio).
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We do not require the compiler to align stuff for our hand-written assembly. We only hope that it's able to align stuff for SSE and similar ops it generates itself.
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*/
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/*
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Those layer-specific structs could actually share memory, as they are not in use simultaneously. One might allocate on decoder switch, too.
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They all reside in one lump of memory (after each other), allocated to layerscratch.
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*/
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real *layerscratch;
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#ifndef NO_LAYER1
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struct
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{
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real (*fraction)[SBLIMIT]; /* ALIGNED(16) real fraction[2][SBLIMIT]; */
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} layer1;
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#endif
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#ifndef NO_LAYER2
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struct
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{
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real (*fraction)[4][SBLIMIT]; /* ALIGNED(16) real fraction[2][4][SBLIMIT] */
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} layer2;
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#endif
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#ifndef NO_LAYER3
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/* These are significant chunks of memory already... */
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struct
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{
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real (*hybrid_in)[SBLIMIT][SSLIMIT]; /* ALIGNED(16) real hybridIn[2][SBLIMIT][SSLIMIT]; */
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real (*hybrid_out)[SSLIMIT][SBLIMIT]; /* ALIGNED(16) real hybridOut[2][SSLIMIT][SBLIMIT]; */
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} layer3;
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#endif
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/* A place for storing additional data for the large file wrapper.
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This is cruft! */
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void *wrapperdata;
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/* A callback used to properly destruct the wrapper data. */
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void (*wrapperclean)(void*);
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};
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/* generic init, does not include dynamic buffers */
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void frame_init(mpg123_handle *fr);
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void frame_init_par(mpg123_handle *fr, mpg123_pars *mp);
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/* output buffer and format */
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int frame_outbuffer(mpg123_handle *fr);
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int frame_output_format(mpg123_handle *fr);
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int frame_buffers(mpg123_handle *fr); /* various decoder buffers, needed once */
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int frame_reset(mpg123_handle* fr); /* reset for next track */
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int frame_buffers_reset(mpg123_handle *fr);
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void frame_exit(mpg123_handle *fr); /* end, free all buffers */
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/* Index functions... */
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/* Well... print it... */
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int mpg123_print_index(mpg123_handle *fr, FILE* out);
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/* Find a seek position in index. */
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off_t frame_index_find(mpg123_handle *fr, off_t want_frame, off_t* get_frame);
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/* Apply index_size setting. */
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int frame_index_setup(mpg123_handle *fr);
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void do_volume(mpg123_handle *fr, double factor);
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void do_rva(mpg123_handle *fr);
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/* samples per frame ...
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Layer I
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Layer II
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Layer III
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MPEG-1
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384
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1152
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1152
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MPEG-2 LSF
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384
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1152
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576
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MPEG 2.5
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384
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1152
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576
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*/
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#define spf(fr) ((fr)->lay == 1 ? 384 : ((fr)->lay==2 ? 1152 : ((fr)->lsf || (fr)->mpeg25 ? 576 : 1152)))
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#ifdef GAPLESS
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/* well, I take that one for granted... at least layer3 */
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#define GAPLESS_DELAY 529
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void frame_gapless_init(mpg123_handle *fr, off_t framecount, off_t bskip, off_t eskip);
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void frame_gapless_realinit(mpg123_handle *fr);
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void frame_gapless_update(mpg123_handle *mh, off_t total_samples);
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/*void frame_gapless_position(mpg123_handle* fr);
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void frame_gapless_bytify(mpg123_handle *fr);
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void frame_gapless_ignore(mpg123_handle *fr, off_t frames);*/
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/* void frame_gapless_buffercheck(mpg123_handle *fr); */
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#endif
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/* Number of samples the decoding of the current frame should yield. */
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off_t frame_expect_outsamples(mpg123_handle *fr);
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/* Skip this frame... do some fake action to get away without actually decoding it. */
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void frame_skip(mpg123_handle *fr);
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/*
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Seeking core functions:
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- convert input sample offset to output sample offset
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- convert frame offset to output sample offset
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- get leading frame offset for output sample offset
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The offsets are "unadjusted"/internal; resampling is being taken care of.
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*/
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off_t frame_ins2outs(mpg123_handle *fr, off_t ins);
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off_t frame_outs(mpg123_handle *fr, off_t num);
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/* This one just computes the expected sample count for _this_ frame. */
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off_t frame_expect_outsampels(mpg123_handle *fr);
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off_t frame_offset(mpg123_handle *fr, off_t outs);
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void frame_set_frameseek(mpg123_handle *fr, off_t fe);
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void frame_set_seek(mpg123_handle *fr, off_t sp);
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off_t frame_tell_seek(mpg123_handle *fr);
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/* Take a copy of the Xing VBR TOC for fuzzy seeking. */
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int frame_fill_toc(mpg123_handle *fr, unsigned char* in);
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#endif
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