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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 http://www.xiph.org/                  *
  10.  *                                                                  *
  11.  ********************************************************************
  12.  
  13.  function: stdio-based convenience library for opening/seeking/decoding
  14.  last mod: $Id: vorbisfile.h 17182 2010-04-29 03:48:32Z xiphmont $
  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. #ifndef OV_EXCLUDE_STATIC_CALLBACKS
  47.  
  48. /* a few sets of convenient callbacks, especially for use under
  49.  * Windows where ov_open_callbacks() should always be used instead of
  50.  * ov_open() to avoid problems with incompatible crt.o version linking
  51.  * issues. */
  52.  
  53. static int _ov_header_fseek_wrap(FILE *f,ogg_int64_t off,int whence){
  54.   if(f==NULL)return(-1);
  55.  
  56. #ifdef __MINGW32__
  57.   return fseeko64(f,off,whence);
  58. #elif defined (_WIN32)
  59.   return _fseeki64(f,off,whence);
  60. #else
  61.   return fseek(f,off,whence);
  62. #endif
  63. }
  64.  
  65. /* These structs below (OV_CALLBACKS_DEFAULT etc) are defined here as
  66.  * static data. That means that every file which includes this header
  67.  * will get its own copy of these structs whether it uses them or
  68.  * not unless it #defines OV_EXCLUDE_STATIC_CALLBACKS.
  69.  * These static symbols are essential on platforms such as Windows on
  70.  * which several different versions of stdio support may be linked to
  71.  * by different DLLs, and we need to be certain we know which one
  72.  * we're using (the same one as the main application).
  73.  */
  74.  
  75. static ov_callbacks OV_CALLBACKS_DEFAULT = {
  76.   (size_t (*)(void *, size_t, size_t, void *))  fread,
  77.   (int (*)(void *, ogg_int64_t, int))           _ov_header_fseek_wrap,
  78.   (int (*)(void *))                             fclose,
  79.   (long (*)(void *))                            ftell
  80. };
  81.  
  82. static ov_callbacks OV_CALLBACKS_NOCLOSE = {
  83.   (size_t (*)(void *, size_t, size_t, void *))  fread,
  84.   (int (*)(void *, ogg_int64_t, int))           _ov_header_fseek_wrap,
  85.   (int (*)(void *))                             NULL,
  86.   (long (*)(void *))                            ftell
  87. };
  88.  
  89. static ov_callbacks OV_CALLBACKS_STREAMONLY = {
  90.   (size_t (*)(void *, size_t, size_t, void *))  fread,
  91.   (int (*)(void *, ogg_int64_t, int))           NULL,
  92.   (int (*)(void *))                             fclose,
  93.   (long (*)(void *))                            NULL
  94. };
  95.  
  96. static ov_callbacks OV_CALLBACKS_STREAMONLY_NOCLOSE = {
  97.   (size_t (*)(void *, size_t, size_t, void *))  fread,
  98.   (int (*)(void *, ogg_int64_t, int))           NULL,
  99.   (int (*)(void *))                             NULL,
  100.   (long (*)(void *))                            NULL
  101. };
  102.  
  103. #endif
  104.  
  105. #define  NOTOPEN   0
  106. #define  PARTOPEN  1
  107. #define  OPENED    2
  108. #define  STREAMSET 3
  109. #define  INITSET   4
  110.  
  111. typedef struct OggVorbis_File {
  112.   void            *datasource; /* Pointer to a FILE *, etc. */
  113.   int              seekable;
  114.   ogg_int64_t      offset;
  115.   ogg_int64_t      end;
  116.   ogg_sync_state   oy;
  117.  
  118.   /* If the FILE handle isn't seekable (eg, a pipe), only the current
  119.      stream appears */
  120.   int              links;
  121.   ogg_int64_t     *offsets;
  122.   ogg_int64_t     *dataoffsets;
  123.   long            *serialnos;
  124.   ogg_int64_t     *pcmlengths; /* overloaded to maintain binary
  125.                                   compatibility; x2 size, stores both
  126.                                   beginning and end values */
  127.   vorbis_info     *vi;
  128.   vorbis_comment  *vc;
  129.  
  130.   /* Decoding working state local storage */
  131.   ogg_int64_t      pcm_offset;
  132.   int              ready_state;
  133.   long             current_serialno;
  134.   int              current_link;
  135.  
  136.   double           bittrack;
  137.   double           samptrack;
  138.  
  139.   ogg_stream_state os; /* take physical pages, weld into a logical
  140.                           stream of packets */
  141.   vorbis_dsp_state vd; /* central working state for the packet->PCM decoder */
  142.   vorbis_block     vb; /* local working space for packet->PCM decode */
  143.  
  144.   ov_callbacks callbacks;
  145.  
  146. } OggVorbis_File;
  147.  
  148.  
  149. extern int ov_clear(OggVorbis_File *vf);
  150. extern int ov_fopen(const char *path,OggVorbis_File *vf);
  151. extern int ov_open(FILE *f,OggVorbis_File *vf,const char *initial,long ibytes);
  152. extern int ov_open_callbacks(void *datasource, OggVorbis_File *vf,
  153.                 const char *initial, long ibytes, ov_callbacks callbacks);
  154.  
  155. extern int ov_test(FILE *f,OggVorbis_File *vf,const char *initial,long ibytes);
  156. extern int ov_test_callbacks(void *datasource, OggVorbis_File *vf,
  157.                 const char *initial, long ibytes, ov_callbacks callbacks);
  158. extern int ov_test_open(OggVorbis_File *vf);
  159.  
  160. extern long ov_bitrate(OggVorbis_File *vf,int i);
  161. extern long ov_bitrate_instant(OggVorbis_File *vf);
  162. extern long ov_streams(OggVorbis_File *vf);
  163. extern long ov_seekable(OggVorbis_File *vf);
  164. extern long ov_serialnumber(OggVorbis_File *vf,int i);
  165.  
  166. extern ogg_int64_t ov_raw_total(OggVorbis_File *vf,int i);
  167. extern ogg_int64_t ov_pcm_total(OggVorbis_File *vf,int i);
  168. extern double ov_time_total(OggVorbis_File *vf,int i);
  169.  
  170. extern int ov_raw_seek(OggVorbis_File *vf,ogg_int64_t pos);
  171. extern int ov_pcm_seek(OggVorbis_File *vf,ogg_int64_t pos);
  172. extern int ov_pcm_seek_page(OggVorbis_File *vf,ogg_int64_t pos);
  173. extern int ov_time_seek(OggVorbis_File *vf,double pos);
  174. extern int ov_time_seek_page(OggVorbis_File *vf,double pos);
  175.  
  176. extern int ov_raw_seek_lap(OggVorbis_File *vf,ogg_int64_t pos);
  177. extern int ov_pcm_seek_lap(OggVorbis_File *vf,ogg_int64_t pos);
  178. extern int ov_pcm_seek_page_lap(OggVorbis_File *vf,ogg_int64_t pos);
  179. extern int ov_time_seek_lap(OggVorbis_File *vf,double pos);
  180. extern int ov_time_seek_page_lap(OggVorbis_File *vf,double pos);
  181.  
  182. extern ogg_int64_t ov_raw_tell(OggVorbis_File *vf);
  183. extern ogg_int64_t ov_pcm_tell(OggVorbis_File *vf);
  184. extern double ov_time_tell(OggVorbis_File *vf);
  185.  
  186. extern vorbis_info *ov_info(OggVorbis_File *vf,int link);
  187. extern vorbis_comment *ov_comment(OggVorbis_File *vf,int link);
  188.  
  189. extern long ov_read_float(OggVorbis_File *vf,float ***pcm_channels,int samples,
  190.                           int *bitstream);
  191. extern long ov_read_filter(OggVorbis_File *vf,char *buffer,int length,
  192.                           int bigendianp,int word,int sgned,int *bitstream,
  193.                           void (*filter)(float **pcm,long channels,long samples,void *filter_param),void *filter_param);
  194. extern long ov_read(OggVorbis_File *vf,char *buffer,int length,
  195.                     int bigendianp,int word,int sgned,int *bitstream);
  196. extern int ov_crosslap(OggVorbis_File *vf1,OggVorbis_File *vf2);
  197.  
  198. extern int ov_halfrate(OggVorbis_File *vf,int flag);
  199. extern int ov_halfrate_p(OggVorbis_File *vf);
  200.  
  201. #ifdef __cplusplus
  202. }
  203. #endif /* __cplusplus */
  204.  
  205. #endif
  206.  
  207.