vorbisfile.h 8.0 KB

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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. function: stdio-based convenience library for opening/seeking/decoding
  13. last mod: $Id: vorbisfile.h 17182 2010-04-29 03:48:32Z xiphmont $
  14. ********************************************************************/
  15. #ifndef _OV_FILE_H_
  16. #define _OV_FILE_H_
  17. #ifdef __cplusplus
  18. extern "C"
  19. {
  20. #endif /* __cplusplus */
  21. #include <stdio.h>
  22. #include "codec.h"
  23. /* The function prototypes for the callbacks are basically the same as for
  24. * the stdio functions fread, fseek, fclose, ftell.
  25. * The one difference is that the FILE * arguments have been replaced with
  26. * a void * - this is to be used as a pointer to whatever internal data these
  27. * functions might need. In the stdio case, it's just a FILE * cast to a void *
  28. *
  29. * If you use other functions, check the docs for these functions and return
  30. * the right values. For seek_func(), you *MUST* return -1 if the stream is
  31. * unseekable
  32. */
  33. typedef struct {
  34. size_t (*read_func) (void *ptr, size_t size, size_t nmemb, void *datasource);
  35. int (*seek_func) (void *datasource, ogg_int64_t offset, int whence);
  36. int (*close_func) (void *datasource);
  37. long (*tell_func) (void *datasource);
  38. } ov_callbacks;
  39. #ifndef OV_EXCLUDE_STATIC_CALLBACKS
  40. /* a few sets of convenient callbacks, especially for use under
  41. * Windows where ov_open_callbacks() should always be used instead of
  42. * ov_open() to avoid problems with incompatible crt.o version linking
  43. * issues. */
  44. static int _ov_header_fseek_wrap(FILE *f,ogg_int64_t off,int whence)
  45. {
  46. if(f==NULL) {
  47. return(-1);
  48. }
  49. #ifdef __MINGW32__
  50. return fseeko64(f,off,whence);
  51. #elif defined (_WIN32)
  52. return _fseeki64(f,off,whence);
  53. #else
  54. return fseek(f,off,whence);
  55. #endif
  56. }
  57. /* These structs below (OV_CALLBACKS_DEFAULT etc) are defined here as
  58. * static data. That means that every file which includes this header
  59. * will get its own copy of these structs whether it uses them or
  60. * not unless it #defines OV_EXCLUDE_STATIC_CALLBACKS.
  61. * These static symbols are essential on platforms such as Windows on
  62. * which several different versions of stdio support may be linked to
  63. * by different DLLs, and we need to be certain we know which one
  64. * we're using (the same one as the main application).
  65. */
  66. static ov_callbacks OV_CALLBACKS_DEFAULT = {
  67. (size_t (*)(void *, size_t, size_t, void *)) fread,
  68. (int (*)(void *, ogg_int64_t, int)) _ov_header_fseek_wrap,
  69. (int (*)(void *)) fclose,
  70. (long (*)(void *)) ftell
  71. };
  72. static ov_callbacks OV_CALLBACKS_NOCLOSE = {
  73. (size_t (*)(void *, size_t, size_t, void *)) fread,
  74. (int (*)(void *, ogg_int64_t, int)) _ov_header_fseek_wrap,
  75. (int (*)(void *)) NULL,
  76. (long (*)(void *)) ftell
  77. };
  78. static ov_callbacks OV_CALLBACKS_STREAMONLY = {
  79. (size_t (*)(void *, size_t, size_t, void *)) fread,
  80. (int (*)(void *, ogg_int64_t, int)) NULL,
  81. (int (*)(void *)) fclose,
  82. (long (*)(void *)) NULL
  83. };
  84. static ov_callbacks OV_CALLBACKS_STREAMONLY_NOCLOSE = {
  85. (size_t (*)(void *, size_t, size_t, void *)) fread,
  86. (int (*)(void *, ogg_int64_t, int)) NULL,
  87. (int (*)(void *)) NULL,
  88. (long (*)(void *)) NULL
  89. };
  90. #endif
  91. #define NOTOPEN 0
  92. #define PARTOPEN 1
  93. #define OPENED 2
  94. #define STREAMSET 3
  95. #define INITSET 4
  96. typedef struct OggVorbis_File {
  97. void *datasource; /* Pointer to a FILE *, etc. */
  98. int seekable;
  99. ogg_int64_t offset;
  100. ogg_int64_t end;
  101. ogg_sync_state oy;
  102. /* If the FILE handle isn't seekable (eg, a pipe), only the current
  103. stream appears */
  104. int links;
  105. ogg_int64_t *offsets;
  106. ogg_int64_t *dataoffsets;
  107. long *serialnos;
  108. ogg_int64_t *pcmlengths; /* overloaded to maintain binary
  109. compatibility; x2 size, stores both
  110. beginning and end values */
  111. vorbis_info *vi;
  112. vorbis_comment *vc;
  113. /* Decoding working state local storage */
  114. ogg_int64_t pcm_offset;
  115. int ready_state;
  116. long current_serialno;
  117. int current_link;
  118. double bittrack;
  119. double samptrack;
  120. ogg_stream_state os; /* take physical pages, weld into a logical
  121. stream of packets */
  122. vorbis_dsp_state vd; /* central working state for the packet->PCM decoder */
  123. vorbis_block vb; /* local working space for packet->PCM decode */
  124. ov_callbacks callbacks;
  125. } OggVorbis_File;
  126. extern int ov_clear(OggVorbis_File *vf);
  127. extern int ov_fopen(const char *path,OggVorbis_File *vf);
  128. extern int ov_open(FILE *f,OggVorbis_File *vf,const char *initial,long ibytes);
  129. extern int ov_open_callbacks(void *datasource, OggVorbis_File *vf,
  130. const char *initial, long ibytes, ov_callbacks callbacks);
  131. extern int ov_test(FILE *f,OggVorbis_File *vf,const char *initial,long ibytes);
  132. extern int ov_test_callbacks(void *datasource, OggVorbis_File *vf,
  133. const char *initial, long ibytes, ov_callbacks callbacks);
  134. extern int ov_test_open(OggVorbis_File *vf);
  135. extern long ov_bitrate(OggVorbis_File *vf,int i);
  136. extern long ov_bitrate_instant(OggVorbis_File *vf);
  137. extern long ov_streams(OggVorbis_File *vf);
  138. extern long ov_seekable(OggVorbis_File *vf);
  139. extern long ov_serialnumber(OggVorbis_File *vf,int i);
  140. extern ogg_int64_t ov_raw_total(OggVorbis_File *vf,int i);
  141. extern ogg_int64_t ov_pcm_total(OggVorbis_File *vf,int i);
  142. extern double ov_time_total(OggVorbis_File *vf,int i);
  143. extern int ov_raw_seek(OggVorbis_File *vf,ogg_int64_t pos);
  144. extern int ov_pcm_seek(OggVorbis_File *vf,ogg_int64_t pos);
  145. extern int ov_pcm_seek_page(OggVorbis_File *vf,ogg_int64_t pos);
  146. extern int ov_time_seek(OggVorbis_File *vf,double pos);
  147. extern int ov_time_seek_page(OggVorbis_File *vf,double pos);
  148. extern int ov_raw_seek_lap(OggVorbis_File *vf,ogg_int64_t pos);
  149. extern int ov_pcm_seek_lap(OggVorbis_File *vf,ogg_int64_t pos);
  150. extern int ov_pcm_seek_page_lap(OggVorbis_File *vf,ogg_int64_t pos);
  151. extern int ov_time_seek_lap(OggVorbis_File *vf,double pos);
  152. extern int ov_time_seek_page_lap(OggVorbis_File *vf,double pos);
  153. extern ogg_int64_t ov_raw_tell(OggVorbis_File *vf);
  154. extern ogg_int64_t ov_pcm_tell(OggVorbis_File *vf);
  155. extern double ov_time_tell(OggVorbis_File *vf);
  156. extern vorbis_info *ov_info(OggVorbis_File *vf,int link);
  157. extern vorbis_comment *ov_comment(OggVorbis_File *vf,int link);
  158. extern long ov_read_float(OggVorbis_File *vf,float ***pcm_channels,int samples,
  159. int *bitstream);
  160. extern long ov_read_filter(OggVorbis_File *vf,char *buffer,int length,
  161. int bigendianp,int word,int sgned,int *bitstream,
  162. void (*filter)(float **pcm,long channels,long samples,void *filter_param),void *filter_param);
  163. extern long ov_read(OggVorbis_File *vf,char *buffer,int length,
  164. int bigendianp,int word,int sgned,int *bitstream);
  165. extern int ov_crosslap(OggVorbis_File *vf1,OggVorbis_File *vf2);
  166. extern int ov_halfrate(OggVorbis_File *vf,int flag);
  167. extern int ov_halfrate_p(OggVorbis_File *vf);
  168. #ifdef __cplusplus
  169. }
  170. #endif /* __cplusplus */
  171. #endif