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vorbisfile.h (5431B)


      1 /********************************************************************
      2  *                                                                  *
      3  * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   *
      4  * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
      5  * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
      6  * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
      7  *                                                                  *
      8  * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2001             *
      9  * by the XIPHOPHORUS Company http://www.xiph.org/                  *
     10  *                                                                  *
     11  ********************************************************************
     12 
     13  function: stdio-based convenience library for opening/seeking/decoding
     14  last mod: $Id: vorbisfile.h 1919 2005-07-24 14:18:04Z baford $
     15 
     16  ********************************************************************/
     17 
     18 #ifndef _OV_FILE_H_
     19 #define _OV_FILE_H_
     20 
     21 #ifdef __cplusplus
     22 extern "C"
     23 {
     24 #endif /* __cplusplus */
     25 
     26 #include <stdio.h>
     27 #include "codec.h"
     28 
     29 /* The function prototypes for the callbacks are basically the same as for
     30  * the stdio functions fread, fseek, fclose, ftell. 
     31  * The one difference is that the FILE * arguments have been replaced with
     32  * a void * - this is to be used as a pointer to whatever internal data these
     33  * functions might need. In the stdio case, it's just a FILE * cast to a void *
     34  * 
     35  * If you use other functions, check the docs for these functions and return
     36  * the right values. For seek_func(), you *MUST* return -1 if the stream is
     37  * unseekable
     38  */
     39 typedef struct {
     40   size_t (*read_func)  (void *ptr, size_t size, size_t nmemb, void *datasource);
     41   int    (*seek_func)  (void *datasource, ogg_int64_t offset, int whence);
     42   int    (*close_func) (void *datasource);
     43   long   (*tell_func)  (void *datasource);
     44 } ov_callbacks;
     45 
     46 #define  NOTOPEN   0
     47 #define  PARTOPEN  1
     48 #define  OPENED    2
     49 #define  STREAMSET 3
     50 #define  INITSET   4
     51 
     52 typedef struct OggVorbis_File {
     53   void            *datasource; /* Pointer to a FILE *, etc. */
     54   int              seekable;
     55   ogg_int64_t      offset;
     56   ogg_int64_t      end;
     57   ogg_sync_state   oy; 
     58 
     59   /* If the FILE handle isn't seekable (eg, a pipe), only the current
     60      stream appears */
     61   int              links;
     62   ogg_int64_t     *offsets;
     63   ogg_int64_t     *dataoffsets;
     64   long            *serialnos;
     65   ogg_int64_t     *pcmlengths; /* overloaded to maintain binary
     66 				  compatability; x2 size, stores both
     67 				  beginning and end values */
     68   vorbis_info     *vi;
     69   vorbis_comment  *vc;
     70 
     71   /* Decoding working state local storage */
     72   ogg_int64_t      pcm_offset;
     73   int              ready_state;
     74   long             current_serialno;
     75   int              current_link;
     76 
     77   double           bittrack;
     78   double           samptrack;
     79 
     80   ogg_stream_state os; /* take physical pages, weld into a logical
     81                           stream of packets */
     82   vorbis_dsp_state vd; /* central working state for the packet->PCM decoder */
     83   vorbis_block     vb; /* local working space for packet->PCM decode */
     84 
     85   ov_callbacks callbacks;
     86 
     87 } OggVorbis_File;
     88 
     89 extern int ov_clear(OggVorbis_File *vf);
     90 extern int ov_open(FILE *f,OggVorbis_File *vf,char *initial,long ibytes);
     91 extern int ov_open_callbacks(void *datasource, OggVorbis_File *vf,
     92 		char *initial, long ibytes, ov_callbacks callbacks);
     93 
     94 extern int ov_test(FILE *f,OggVorbis_File *vf,char *initial,long ibytes);
     95 extern int ov_test_callbacks(void *datasource, OggVorbis_File *vf,
     96 		char *initial, long ibytes, ov_callbacks callbacks);
     97 extern int ov_test_open(OggVorbis_File *vf);
     98 
     99 extern long ov_bitrate(OggVorbis_File *vf,int i);
    100 extern long ov_bitrate_instant(OggVorbis_File *vf);
    101 extern long ov_streams(OggVorbis_File *vf);
    102 extern long ov_seekable(OggVorbis_File *vf);
    103 extern long ov_serialnumber(OggVorbis_File *vf,int i);
    104 
    105 extern ogg_int64_t ov_raw_total(OggVorbis_File *vf,int i);
    106 extern ogg_int64_t ov_pcm_total(OggVorbis_File *vf,int i);
    107 extern double ov_time_total(OggVorbis_File *vf,int i);
    108 
    109 extern int ov_raw_seek(OggVorbis_File *vf,ogg_int64_t pos);
    110 extern int ov_pcm_seek(OggVorbis_File *vf,ogg_int64_t pos);
    111 extern int ov_pcm_seek_page(OggVorbis_File *vf,ogg_int64_t pos);
    112 extern int ov_time_seek(OggVorbis_File *vf,double pos);
    113 extern int ov_time_seek_page(OggVorbis_File *vf,double pos);
    114 
    115 extern int ov_raw_seek_lap(OggVorbis_File *vf,ogg_int64_t pos);
    116 extern int ov_pcm_seek_lap(OggVorbis_File *vf,ogg_int64_t pos);
    117 extern int ov_pcm_seek_page_lap(OggVorbis_File *vf,ogg_int64_t pos);
    118 extern int ov_time_seek_lap(OggVorbis_File *vf,double pos);
    119 extern int ov_time_seek_page_lap(OggVorbis_File *vf,double pos);
    120 
    121 extern ogg_int64_t ov_raw_tell(OggVorbis_File *vf);
    122 extern ogg_int64_t ov_pcm_tell(OggVorbis_File *vf);
    123 extern double ov_time_tell(OggVorbis_File *vf);
    124 
    125 extern vorbis_info *ov_info(OggVorbis_File *vf,int link);
    126 extern vorbis_comment *ov_comment(OggVorbis_File *vf,int link);
    127 
    128 extern long ov_read_float(OggVorbis_File *vf,float ***pcm_channels,int samples,
    129 			  int *bitstream);
    130 extern long ov_read(OggVorbis_File *vf,char *buffer,int length,
    131 		    int bigendianp,int word,int sgned,int *bitstream);
    132 extern int ov_crosslap(OggVorbis_File *vf1,OggVorbis_File *vf2);
    133 
    134 extern int ov_halfrate(OggVorbis_File *vf,int flag);
    135 extern int ov_halfrate_p(OggVorbis_File *vf);
    136 
    137 #ifdef __cplusplus
    138 }
    139 #endif /* __cplusplus */
    140 
    141 #endif
    142 
    143