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