forked from KolibriOS/kolibrios
138 lines
5.3 KiB
C
138 lines
5.3 KiB
C
/*
|
|
reader: reading input data
|
|
|
|
copyright ?-2007 by the mpg123 project - free software under the terms of the LGPL 2.1
|
|
see COPYING and AUTHORS files in distribution or http://mpg123.org
|
|
initially written by Thomas Orgis (after code from Michael Hipp)
|
|
*/
|
|
|
|
#ifndef MPG123_READER_H
|
|
#define MPG123_READER_H
|
|
|
|
#include "config.h"
|
|
#include "mpg123.h"
|
|
|
|
#ifndef NO_FEEDER
|
|
struct buffy
|
|
{
|
|
unsigned char *data;
|
|
ssize_t size;
|
|
ssize_t realsize;
|
|
struct buffy *next;
|
|
};
|
|
|
|
|
|
struct bufferchain
|
|
{
|
|
struct buffy* first; /* The beginning of the chain. */
|
|
struct buffy* last; /* The end... of the chain. */
|
|
ssize_t size; /* Aggregated size of all buffies. */
|
|
/* These positions are relative to buffer chain beginning. */
|
|
ssize_t pos; /* Position in whole chain. */
|
|
ssize_t firstpos; /* The point of return on non-forget() */
|
|
/* The "real" filepos is fileoff + pos. */
|
|
off_t fileoff; /* Beginning of chain is at this file offset. */
|
|
size_t bufblock; /* Default (minimal) size of buffers. */
|
|
size_t pool_size; /* Keep that many buffers in storage. */
|
|
size_t pool_fill; /* That many buffers are there. */
|
|
/* A pool of buffers to re-use, if activated. It's a linked list that is worked on from the front. */
|
|
struct buffy *pool;
|
|
};
|
|
|
|
/* Call this before any buffer chain use (even bc_init()). */
|
|
void bc_prepare(struct bufferchain *, size_t pool_size, size_t bufblock);
|
|
/* Free persistent data in the buffer chain, after bc_reset(). */
|
|
void bc_cleanup(struct bufferchain *);
|
|
/* Change pool size. This does not actually allocate/free anything on itself, just instructs later operations to free less / allocate more buffers. */
|
|
void bc_poolsize(struct bufferchain *, size_t pool_size, size_t bufblock);
|
|
/* Return available byte count in the buffer. */
|
|
size_t bc_fill(struct bufferchain *bc);
|
|
|
|
#endif
|
|
|
|
struct reader_data
|
|
{
|
|
off_t filelen; /* total file length or total buffer size */
|
|
off_t filepos; /* position in file or position in buffer chain */
|
|
int filept;
|
|
/* Custom opaque I/O handle from the client. */
|
|
void *iohandle;
|
|
int flags;
|
|
long timeout_sec;
|
|
ssize_t (*fdread) (mpg123_handle *, void *, size_t);
|
|
/* User can replace the read and lseek functions. The r_* are the stored replacement functions or NULL. */
|
|
ssize_t (*r_read) (int fd, void *buf, size_t count);
|
|
off_t (*r_lseek)(int fd, off_t offset, int whence);
|
|
/* These are custom I/O routines for opaque user handles.
|
|
They get picked if there's some iohandle set. */
|
|
ssize_t (*r_read_handle) (void *handle, void *buf, size_t count);
|
|
off_t (*r_lseek_handle)(void *handle, off_t offset, int whence);
|
|
/* An optional cleaner for the handle on closing the stream. */
|
|
void (*cleanup_handle)(void *handle);
|
|
/* These two pointers are the actual workers (default map to POSIX read/lseek). */
|
|
ssize_t (*read) (int fd, void *buf, size_t count);
|
|
off_t (*lseek)(int fd, off_t offset, int whence);
|
|
/* Buffered readers want that abstracted, set internally. */
|
|
ssize_t (*fullread)(mpg123_handle *, unsigned char *, ssize_t);
|
|
#ifndef NO_FEEDER
|
|
struct bufferchain buffer; /* Not dynamically allocated, these few struct bytes aren't worth the trouble. */
|
|
#endif
|
|
};
|
|
|
|
/* start to use off_t to properly do LFS in future ... used to be long */
|
|
struct reader
|
|
{
|
|
int (*init) (mpg123_handle *);
|
|
void (*close) (mpg123_handle *);
|
|
ssize_t (*fullread) (mpg123_handle *, unsigned char *, ssize_t);
|
|
int (*head_read) (mpg123_handle *, unsigned long *newhead); /* succ: TRUE, else <= 0 (FALSE or READER_MORE) */
|
|
int (*head_shift) (mpg123_handle *, unsigned long *head); /* succ: TRUE, else <= 0 (FALSE or READER_MORE) */
|
|
off_t (*skip_bytes) (mpg123_handle *, off_t len); /* succ: >=0, else error or READER_MORE */
|
|
int (*read_frame_body)(mpg123_handle *, unsigned char *, int size);
|
|
int (*back_bytes) (mpg123_handle *, off_t bytes);
|
|
int (*seek_frame) (mpg123_handle *, off_t num);
|
|
off_t (*tell) (mpg123_handle *);
|
|
void (*rewind) (mpg123_handle *);
|
|
void (*forget) (mpg123_handle *);
|
|
};
|
|
|
|
/* Open a file by path or use an opened file descriptor. */
|
|
int open_stream(mpg123_handle *, const char *path, int fd);
|
|
/* Open an external handle. */
|
|
int open_stream_handle(mpg123_handle *, void *iohandle);
|
|
|
|
/* feed based operation has some specials */
|
|
int open_feed(mpg123_handle *);
|
|
/* externally called function, returns 0 on success, -1 on error */
|
|
int feed_more(mpg123_handle *fr, const unsigned char *in, long count);
|
|
void feed_forget(mpg123_handle *fr); /* forget the data that has been read (free some buffers) */
|
|
off_t feed_set_pos(mpg123_handle *fr, off_t pos); /* Set position (inside available data if possible), return wanted byte offset of next feed. */
|
|
|
|
void open_bad(mpg123_handle *);
|
|
|
|
#define READER_FD_OPENED 0x1
|
|
#define READER_ID3TAG 0x2
|
|
#define READER_SEEKABLE 0x4
|
|
#define READER_BUFFERED 0x8
|
|
#define READER_NONBLOCK 0x20
|
|
#define READER_HANDLEIO 0x40
|
|
|
|
#define READER_STREAM 0
|
|
#define READER_ICY_STREAM 1
|
|
#define READER_FEED 2
|
|
/* These two add a little buffering to enable small seeks for peek ahead. */
|
|
#define READER_BUF_STREAM 3
|
|
#define READER_BUF_ICY_STREAM 4
|
|
|
|
#ifdef READ_SYSTEM
|
|
#define READER_SYSTEM 5
|
|
#define READERS 6
|
|
#else
|
|
#define READERS 5
|
|
#endif
|
|
|
|
#define READER_ERROR MPG123_ERR
|
|
#define READER_MORE MPG123_NEED_MORE
|
|
|
|
#endif
|