206 lines
7.8 KiB
C
206 lines
7.8 KiB
C
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/********************************************************************
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* *
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* THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
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* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
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* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
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* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
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* *
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* THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2007 *
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* by the Xiph.Org Foundation http://www.xiph.org/ *
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* *
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********************************************************************
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function: stdio-based convenience library for opening/seeking/decoding
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********************************************************************/
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#ifndef _OV_FILE_H_
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#define _OV_FILE_H_
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#ifdef __cplusplus
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extern "C"
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{
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#endif /* __cplusplus */
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#include <stdio.h>
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#include "codec.h"
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/* The function prototypes for the callbacks are basically the same as for
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* the stdio functions fread, fseek, fclose, ftell.
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* The one difference is that the FILE * arguments have been replaced with
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* a void * - this is to be used as a pointer to whatever internal data these
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* functions might need. In the stdio case, it's just a FILE * cast to a void *
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*
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* If you use other functions, check the docs for these functions and return
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* the right values. For seek_func(), you *MUST* return -1 if the stream is
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* unseekable
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*/
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typedef struct {
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size_t (*read_func) (void *ptr, size_t size, size_t nmemb, void *datasource);
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int (*seek_func) (void *datasource, ogg_int64_t offset, int whence);
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int (*close_func) (void *datasource);
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long (*tell_func) (void *datasource);
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} ov_callbacks;
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#ifndef OV_EXCLUDE_STATIC_CALLBACKS
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/* a few sets of convenient callbacks, especially for use under
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* Windows where ov_open_callbacks() should always be used instead of
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* ov_open() to avoid problems with incompatible crt.o version linking
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* issues. */
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static int _ov_header_fseek_wrap(FILE *f,ogg_int64_t off,int whence){
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if(f==NULL)return(-1);
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#ifdef __MINGW32__
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return fseeko64(f,off,whence);
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#elif defined (_WIN32)
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return _fseeki64(f,off,whence);
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#else
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return fseek(f,off,whence);
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#endif
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}
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/* These structs below (OV_CALLBACKS_DEFAULT etc) are defined here as
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* static data. That means that every file which includes this header
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* will get its own copy of these structs whether it uses them or
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* not unless it #defines OV_EXCLUDE_STATIC_CALLBACKS.
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* These static symbols are essential on platforms such as Windows on
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* which several different versions of stdio support may be linked to
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* by different DLLs, and we need to be certain we know which one
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* we're using (the same one as the main application).
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*/
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static ov_callbacks OV_CALLBACKS_DEFAULT = {
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(size_t (*)(void *, size_t, size_t, void *)) fread,
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(int (*)(void *, ogg_int64_t, int)) _ov_header_fseek_wrap,
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(int (*)(void *)) fclose,
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(long (*)(void *)) ftell
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};
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static ov_callbacks OV_CALLBACKS_NOCLOSE = {
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(size_t (*)(void *, size_t, size_t, void *)) fread,
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(int (*)(void *, ogg_int64_t, int)) _ov_header_fseek_wrap,
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(int (*)(void *)) NULL,
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(long (*)(void *)) ftell
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};
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static ov_callbacks OV_CALLBACKS_STREAMONLY = {
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(size_t (*)(void *, size_t, size_t, void *)) fread,
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(int (*)(void *, ogg_int64_t, int)) NULL,
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(int (*)(void *)) fclose,
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(long (*)(void *)) NULL
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};
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static ov_callbacks OV_CALLBACKS_STREAMONLY_NOCLOSE = {
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(size_t (*)(void *, size_t, size_t, void *)) fread,
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(int (*)(void *, ogg_int64_t, int)) NULL,
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(int (*)(void *)) NULL,
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(long (*)(void *)) NULL
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};
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#endif
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#define NOTOPEN 0
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#define PARTOPEN 1
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#define OPENED 2
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#define STREAMSET 3
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#define INITSET 4
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typedef struct OggVorbis_File {
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void *datasource; /* Pointer to a FILE *, etc. */
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int seekable;
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ogg_int64_t offset;
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ogg_int64_t end;
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ogg_sync_state oy;
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/* If the FILE handle isn't seekable (eg, a pipe), only the current
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stream appears */
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int links;
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ogg_int64_t *offsets;
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ogg_int64_t *dataoffsets;
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long *serialnos;
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ogg_int64_t *pcmlengths; /* overloaded to maintain binary
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compatibility; x2 size, stores both
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beginning and end values */
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vorbis_info *vi;
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vorbis_comment *vc;
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/* Decoding working state local storage */
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ogg_int64_t pcm_offset;
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int ready_state;
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long current_serialno;
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int current_link;
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double bittrack;
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double samptrack;
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ogg_stream_state os; /* take physical pages, weld into a logical
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stream of packets */
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vorbis_dsp_state vd; /* central working state for the packet->PCM decoder */
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vorbis_block vb; /* local working space for packet->PCM decode */
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ov_callbacks callbacks;
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} OggVorbis_File;
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extern int ov_clear(OggVorbis_File *vf);
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extern int ov_fopen(const char *path,OggVorbis_File *vf);
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extern int ov_open(FILE *f,OggVorbis_File *vf,const char *initial,long ibytes);
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extern int ov_open_callbacks(void *datasource, OggVorbis_File *vf,
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const char *initial, long ibytes, ov_callbacks callbacks);
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extern int ov_test(FILE *f,OggVorbis_File *vf,const char *initial,long ibytes);
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extern int ov_test_callbacks(void *datasource, OggVorbis_File *vf,
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const char *initial, long ibytes, ov_callbacks callbacks);
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extern int ov_test_open(OggVorbis_File *vf);
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extern long ov_bitrate(OggVorbis_File *vf,int i);
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extern long ov_bitrate_instant(OggVorbis_File *vf);
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extern long ov_streams(OggVorbis_File *vf);
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extern long ov_seekable(OggVorbis_File *vf);
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extern long ov_serialnumber(OggVorbis_File *vf,int i);
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extern ogg_int64_t ov_raw_total(OggVorbis_File *vf,int i);
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extern ogg_int64_t ov_pcm_total(OggVorbis_File *vf,int i);
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extern double ov_time_total(OggVorbis_File *vf,int i);
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extern int ov_raw_seek(OggVorbis_File *vf,ogg_int64_t pos);
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extern int ov_pcm_seek(OggVorbis_File *vf,ogg_int64_t pos);
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extern int ov_pcm_seek_page(OggVorbis_File *vf,ogg_int64_t pos);
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extern int ov_time_seek(OggVorbis_File *vf,double pos);
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extern int ov_time_seek_page(OggVorbis_File *vf,double pos);
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extern int ov_raw_seek_lap(OggVorbis_File *vf,ogg_int64_t pos);
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extern int ov_pcm_seek_lap(OggVorbis_File *vf,ogg_int64_t pos);
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extern int ov_pcm_seek_page_lap(OggVorbis_File *vf,ogg_int64_t pos);
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extern int ov_time_seek_lap(OggVorbis_File *vf,double pos);
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extern int ov_time_seek_page_lap(OggVorbis_File *vf,double pos);
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extern ogg_int64_t ov_raw_tell(OggVorbis_File *vf);
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extern ogg_int64_t ov_pcm_tell(OggVorbis_File *vf);
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extern double ov_time_tell(OggVorbis_File *vf);
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extern vorbis_info *ov_info(OggVorbis_File *vf,int link);
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extern vorbis_comment *ov_comment(OggVorbis_File *vf,int link);
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extern long ov_read_float(OggVorbis_File *vf,float ***pcm_channels,int samples,
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int *bitstream);
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extern long ov_read_filter(OggVorbis_File *vf,char *buffer,int length,
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int bigendianp,int word,int sgned,int *bitstream,
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void (*filter)(float **pcm,long channels,long samples,void *filter_param),void *filter_param);
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extern long ov_read(OggVorbis_File *vf,char *buffer,int length,
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int bigendianp,int word,int sgned,int *bitstream);
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extern int ov_crosslap(OggVorbis_File *vf1,OggVorbis_File *vf2);
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extern int ov_halfrate(OggVorbis_File *vf,int flag);
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extern int ov_halfrate_p(OggVorbis_File *vf);
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif
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