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  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 1994-2007             *
  9.  * by the Xiph.Org Foundation https://xiph.org/                     *
  10.  *                                                                  *
  11.  ********************************************************************
  12.  
  13.  function: stdio-based convenience library for opening/seeking/decoding
  14.  
  15.  ********************************************************************/
  16.  
  17. #ifndef _OV_FILE_H_
  18. #define _OV_FILE_H_
  19.  
  20. #ifdef __cplusplus
  21. extern "C"
  22. {
  23. #endif /* __cplusplus */
  24.  
  25. #include <stdio.h>
  26. #include "codec.h"
  27.  
  28. /* The function prototypes for the callbacks are basically the same as for
  29.  * the stdio functions fread, fseek, fclose, ftell.
  30.  * The one difference is that the FILE * arguments have been replaced with
  31.  * a void * - this is to be used as a pointer to whatever internal data these
  32.  * functions might need. In the stdio case, it's just a FILE * cast to a void *
  33.  *
  34.  * If you use other functions, check the docs for these functions and return
  35.  * the right values. For seek_func(), you *MUST* return -1 if the stream is
  36.  * unseekable
  37.  */
  38. typedef struct {
  39.   size_t (*read_func)  (void *ptr, size_t size, size_t nmemb, void *datasource);
  40.   int    (*seek_func)  (void *datasource, ogg_int64_t offset, int whence);
  41.   int    (*close_func) (void *datasource);
  42.   long   (*tell_func)  (void *datasource);
  43. } ov_callbacks;
  44.  
  45. #ifndef OV_EXCLUDE_STATIC_CALLBACKS
  46.  
  47. /* a few sets of convenient callbacks, especially for use under
  48.  * Windows where ov_open_callbacks() should always be used instead of
  49.  * ov_open() to avoid problems with incompatible crt.o version linking
  50.  * issues. */
  51.  
  52. static int _ov_header_fseek_wrap(FILE *f,ogg_int64_t off,int whence){
  53.   if(f==NULL)return(-1);
  54.  
  55. #ifdef __MINGW32__
  56.   return fseeko64(f,off,whence);
  57. #elif defined (_WIN32)
  58.   return _fseeki64(f,off,whence);
  59. #else
  60.   return fseek(f,off,whence);
  61. #endif
  62. }
  63.  
  64. /* These structs below (OV_CALLBACKS_DEFAULT etc) are defined here as
  65.  * static data. That means that every file which includes this header
  66.  * will get its own copy of these structs whether it uses them or
  67.  * not unless it #defines OV_EXCLUDE_STATIC_CALLBACKS.
  68.  * These static symbols are essential on platforms such as Windows on
  69.  * which several different versions of stdio support may be linked to
  70.  * by different DLLs, and we need to be certain we know which one
  71.  * we're using (the same one as the main application).
  72.  */
  73.  
  74. static ov_callbacks OV_CALLBACKS_DEFAULT = {
  75.   (size_t (*)(void *, size_t, size_t, void *))  fread,
  76.   (int (*)(void *, ogg_int64_t, int))           _ov_header_fseek_wrap,
  77.   (int (*)(void *))                             fclose,
  78.   (long (*)(void *))                            ftell
  79. };
  80.  
  81. static ov_callbacks OV_CALLBACKS_NOCLOSE = {
  82.   (size_t (*)(void *, size_t, size_t, void *))  fread,
  83.   (int (*)(void *, ogg_int64_t, int))           _ov_header_fseek_wrap,
  84.   (int (*)(void *))                             NULL,
  85.   (long (*)(void *))                            ftell
  86. };
  87.  
  88. static ov_callbacks OV_CALLBACKS_STREAMONLY = {
  89.   (size_t (*)(void *, size_t, size_t, void *))  fread,
  90.   (int (*)(void *, ogg_int64_t, int))           NULL,
  91.   (int (*)(void *))                             fclose,
  92.   (long (*)(void *))                            NULL
  93. };
  94.  
  95. static ov_callbacks OV_CALLBACKS_STREAMONLY_NOCLOSE = {
  96.   (size_t (*)(void *, size_t, size_t, void *))  fread,
  97.   (int (*)(void *, ogg_int64_t, int))           NULL,
  98.   (int (*)(void *))                             NULL,
  99.   (long (*)(void *))                            NULL
  100. };
  101.  
  102. #endif
  103.  
  104. #define  NOTOPEN   0
  105. #define  PARTOPEN  1
  106. #define  OPENED    2
  107. #define  STREAMSET 3
  108. #define  INITSET   4
  109.  
  110. typedef struct OggVorbis_File {
  111.   void            *datasource; /* Pointer to a FILE *, etc. */
  112.   int              seekable;
  113.   ogg_int64_t      offset;
  114.   ogg_int64_t      end;
  115.   ogg_sync_state   oy;
  116.  
  117.   /* If the FILE handle isn't seekable (eg, a pipe), only the current
  118.      stream appears */
  119.   int              links;
  120.   ogg_int64_t     *offsets;
  121.   ogg_int64_t     *dataoffsets;
  122.   long            *serialnos;
  123.   ogg_int64_t     *pcmlengths; /* overloaded to maintain binary
  124.                                   compatibility; x2 size, stores both
  125.                                   beginning and end values */
  126.   vorbis_info     *vi;
  127.   vorbis_comment  *vc;
  128.  
  129.   /* Decoding working state local storage */
  130.   ogg_int64_t      pcm_offset;
  131.   int              ready_state;
  132.   long             current_serialno;
  133.   int              current_link;
  134.  
  135.   double           bittrack;
  136.   double           samptrack;
  137.  
  138.   ogg_stream_state os; /* take physical pages, weld into a logical
  139.                           stream of packets */
  140.   vorbis_dsp_state vd; /* central working state for the packet->PCM decoder */
  141.   vorbis_block     vb; /* local working space for packet->PCM decode */
  142.  
  143.   ov_callbacks callbacks;
  144.  
  145. } OggVorbis_File;
  146.  
  147.  
  148. extern int ov_clear(OggVorbis_File *vf);
  149. extern int ov_fopen(const char *path,OggVorbis_File *vf);
  150. extern int ov_open(FILE *f,OggVorbis_File *vf,const char *initial,long ibytes);
  151. extern int ov_open_callbacks(void *datasource, OggVorbis_File *vf,
  152.                 const char *initial, long ibytes, ov_callbacks callbacks);
  153.  
  154. extern int ov_test(FILE *f,OggVorbis_File *vf,const char *initial,long ibytes);
  155. extern int ov_test_callbacks(void *datasource, OggVorbis_File *vf,
  156.                 const char *initial, long ibytes, ov_callbacks callbacks);
  157. extern int ov_test_open(OggVorbis_File *vf);
  158.  
  159. extern long ov_bitrate(OggVorbis_File *vf,int i);
  160. extern long ov_bitrate_instant(OggVorbis_File *vf);
  161. extern long ov_streams(OggVorbis_File *vf);
  162. extern long ov_seekable(OggVorbis_File *vf);
  163. extern long ov_serialnumber(OggVorbis_File *vf,int i);
  164.  
  165. extern ogg_int64_t ov_raw_total(OggVorbis_File *vf,int i);
  166. extern ogg_int64_t ov_pcm_total(OggVorbis_File *vf,int i);
  167. extern double ov_time_total(OggVorbis_File *vf,int i);
  168.  
  169. extern int ov_raw_seek(OggVorbis_File *vf,ogg_int64_t pos);
  170. extern int ov_pcm_seek(OggVorbis_File *vf,ogg_int64_t pos);
  171. extern int ov_pcm_seek_page(OggVorbis_File *vf,ogg_int64_t pos);
  172. extern int ov_time_seek(OggVorbis_File *vf,double pos);
  173. extern int ov_time_seek_page(OggVorbis_File *vf,double pos);
  174.  
  175. extern int ov_raw_seek_lap(OggVorbis_File *vf,ogg_int64_t pos);
  176. extern int ov_pcm_seek_lap(OggVorbis_File *vf,ogg_int64_t pos);
  177. extern int ov_pcm_seek_page_lap(OggVorbis_File *vf,ogg_int64_t pos);
  178. extern int ov_time_seek_lap(OggVorbis_File *vf,double pos);
  179. extern int ov_time_seek_page_lap(OggVorbis_File *vf,double pos);
  180.  
  181. extern ogg_int64_t ov_raw_tell(OggVorbis_File *vf);
  182. extern ogg_int64_t ov_pcm_tell(OggVorbis_File *vf);
  183. extern double ov_time_tell(OggVorbis_File *vf);
  184.  
  185. extern vorbis_info *ov_info(OggVorbis_File *vf,int link);
  186. extern vorbis_comment *ov_comment(OggVorbis_File *vf,int link);
  187.  
  188. extern long ov_read_float(OggVorbis_File *vf,float ***pcm_channels,int samples,
  189.                           int *bitstream);
  190. extern long ov_read_filter(OggVorbis_File *vf,char *buffer,int length,
  191.                           int bigendianp,int word,int sgned,int *bitstream,
  192.                           void (*filter)(float **pcm,long channels,long samples,void *filter_param),void *filter_param);
  193. extern long ov_read(OggVorbis_File *vf,char *buffer,int length,
  194.                     int bigendianp,int word,int sgned,int *bitstream);
  195. extern int ov_crosslap(OggVorbis_File *vf1,OggVorbis_File *vf2);
  196.  
  197. extern int ov_halfrate(OggVorbis_File *vf,int flag);
  198. extern int ov_halfrate_p(OggVorbis_File *vf);
  199.  
  200. #ifdef __cplusplus
  201. }
  202. #endif /* __cplusplus */
  203.  
  204. #endif
  205.  
  206.