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 17021 2010-03-24 09:29:41Z 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(char *path,OggVorbis_File *vf); 151 extern int ov_open(FILE *f,OggVorbis_File *vf,char *initial,long ibytes); 152 extern int ov_open_callbacks(void *datasource, OggVorbis_File *vf, 153 char *initial, long ibytes, ov_callbacks callbacks); 154 155 extern int ov_test(FILE *f,OggVorbis_File *vf,char *initial,long ibytes); 156 extern int ov_test_callbacks(void *datasource, OggVorbis_File *vf, 157 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
