vorbisfile.h
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上传日期:2007-05-01
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- /********************************************************************
- * *
- * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
- * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
- * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
- * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
- * *
- * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2001 *
- * by the XIPHOPHORUS Company http://www.xiph.org/ *
- ********************************************************************
- function: stdio-based convenience library for opening/seeking/decoding
- last mod: $Id: vorbisfile.h,v 1.1.1.1 2003/02/06 04:06:52 hurly Exp $
- ********************************************************************/
- #ifndef _OV_FILE_H_
- #define _OV_FILE_H_
- #ifdef __cplusplus
- extern "C"
- {
- #endif /* __cplusplus */
- #include <stdio.h>
- #include "codec.h"
- /* The function prototypes for the callbacks are basically the same as for
- * the stdio functions fread, fseek, fclose, ftell.
- * The one difference is that the FILE * arguments have been replaced with
- * a void * - this is to be used as a pointer to whatever internal data these
- * functions might need. In the stdio case, it's just a FILE * cast to a void *
- *
- * If you use other functions, check the docs for these functions and return
- * the right values. For seek_func(), you *MUST* return -1 if the stream is
- * unseekable
- */
- typedef struct {
- size_t (*read_func) (void *ptr, size_t size, size_t nmemb, void *datasource);
- int (*seek_func) (void *datasource, ogg_int64_t offset, int whence);
- int (*close_func) (void *datasource);
- long (*tell_func) (void *datasource);
- } ov_callbacks;
- typedef struct OggVorbis_File {
- void *datasource; /* Pointer to a FILE *, etc. */
- int seekable;
- ogg_int64_t offset;
- ogg_int64_t end;
- ogg_sync_state oy;
- /* If the FILE handle isn't seekable (eg, a pipe), only the current
- stream appears */
- int links;
- ogg_int64_t *offsets;
- ogg_int64_t *dataoffsets;
- long *serialnos;
- ogg_int64_t *pcmlengths;
- vorbis_info *vi;
- vorbis_comment *vc;
- /* Decoding working state local storage */
- ogg_int64_t pcm_offset;
- int decode_ready;
- long current_serialno;
- int current_link;
- double bittrack;
- double samptrack;
- ogg_stream_state os; /* take physical pages, weld into a logical
- stream of packets */
- vorbis_dsp_state vd; /* central working state for the packet->PCM decoder */
- vorbis_block vb; /* local working space for packet->PCM decode */
- ov_callbacks callbacks;
- } OggVorbis_File;
- extern int ov_clear(OggVorbis_File *vf);
- extern int ov_open(FILE *f,OggVorbis_File *vf,char *initial,long ibytes);
- extern int ov_open_callbacks(void *datasource, OggVorbis_File *vf,
- char *initial, long ibytes, ov_callbacks callbacks);
- extern long ov_bitrate(OggVorbis_File *vf,int i);
- extern long ov_bitrate_instant(OggVorbis_File *vf);
- extern long ov_streams(OggVorbis_File *vf);
- extern long ov_seekable(OggVorbis_File *vf);
- extern long ov_serialnumber(OggVorbis_File *vf,int i);
- extern ogg_int64_t ov_raw_total(OggVorbis_File *vf,int i);
- extern ogg_int64_t ov_pcm_total(OggVorbis_File *vf,int i);
- extern double ov_time_total(OggVorbis_File *vf,int i);
- extern int ov_raw_seek(OggVorbis_File *vf,long pos);
- extern int ov_pcm_seek(OggVorbis_File *vf,ogg_int64_t pos);
- extern int ov_pcm_seek_page(OggVorbis_File *vf,ogg_int64_t pos);
- extern int ov_time_seek(OggVorbis_File *vf,double pos);
- extern int ov_time_seek_page(OggVorbis_File *vf,double pos);
- extern ogg_int64_t ov_raw_tell(OggVorbis_File *vf);
- extern ogg_int64_t ov_pcm_tell(OggVorbis_File *vf);
- extern double ov_time_tell(OggVorbis_File *vf);
- extern vorbis_info *ov_info(OggVorbis_File *vf,int link);
- extern vorbis_comment *ov_comment(OggVorbis_File *vf,int link);
- extern long ov_read(OggVorbis_File *vf,char *buffer,int length,
- int bigendianp,int word,int sgned,int *bitstream);
- #ifdef __cplusplus
- }
- #endif /* __cplusplus */
- #endif