1 /******************************************************************** 2 * * 3 * THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE. * 4 * * 5 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS * 6 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE * 7 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. * 8 * * 9 * THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2003 * 10 * BY THE Xiph.Org FOUNDATION http://www.xiph.org/ * 11 * * 12 ******************************************************************** 13 14 function: stdio-based convenience library for opening/seeking/decoding 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 "ivorbiscodec.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 typedef struct OggVorbis_File { 47 void *datasource; /* Pointer to a FILE *, etc. */ 48 int seekable; 49 ogg_int64_t offset; 50 ogg_int64_t end; 51 ogg_sync_state *oy; 52 53 /* If the FILE handle isn't seekable (eg, a pipe), only the current 54 stream appears */ 55 int links; 56 ogg_int64_t *offsets; 57 ogg_int64_t *dataoffsets; 58 ogg_uint32_t *serialnos; 59 ogg_int64_t *pcmlengths; 60 vorbis_info vi; 61 vorbis_comment vc; 62 63 /* Decoding working state local storage */ 64 ogg_int64_t pcm_offset; 65 int ready_state; 66 ogg_uint32_t current_serialno; 67 int current_link; 68 69 ogg_int64_t bittrack; 70 ogg_int64_t samptrack; 71 72 ogg_stream_state *os; /* take physical pages, weld into a logical 73 stream of packets */ 74 vorbis_dsp_state *vd; /* central working state for the packet->PCM decoder */ 75 76 ov_callbacks callbacks; 77 78 } OggVorbis_File; 79 80 extern int ov_clear(OggVorbis_File *vf); 81 extern int ov_open(FILE *f,OggVorbis_File *vf,char *initial,long ibytes); 82 extern int ov_open_callbacks(void *datasource, OggVorbis_File *vf, 83 char *initial, long ibytes, ov_callbacks callbacks); 84 85 extern int ov_test(FILE *f,OggVorbis_File *vf,char *initial,long ibytes); 86 extern int ov_test_callbacks(void *datasource, OggVorbis_File *vf, 87 char *initial, long ibytes, ov_callbacks callbacks); 88 extern int ov_test_open(OggVorbis_File *vf); 89 90 extern long ov_bitrate(OggVorbis_File *vf,int i); 91 extern long ov_bitrate_instant(OggVorbis_File *vf); 92 extern long ov_streams(OggVorbis_File *vf); 93 extern long ov_seekable(OggVorbis_File *vf); 94 extern long ov_serialnumber(OggVorbis_File *vf,int i); 95 96 extern ogg_int64_t ov_raw_total(OggVorbis_File *vf,int i); 97 extern ogg_int64_t ov_pcm_total(OggVorbis_File *vf,int i); 98 extern ogg_int64_t ov_time_total(OggVorbis_File *vf,int i); 99 100 extern int ov_raw_seek(OggVorbis_File *vf,ogg_int64_t pos); 101 extern int ov_pcm_seek(OggVorbis_File *vf,ogg_int64_t pos); 102 extern int ov_pcm_seek_page(OggVorbis_File *vf,ogg_int64_t pos); 103 extern int ov_time_seek(OggVorbis_File *vf,ogg_int64_t pos); 104 extern int ov_time_seek_page(OggVorbis_File *vf,ogg_int64_t pos); 105 106 extern ogg_int64_t ov_raw_tell(OggVorbis_File *vf); 107 extern ogg_int64_t ov_pcm_tell(OggVorbis_File *vf); 108 extern ogg_int64_t ov_time_tell(OggVorbis_File *vf); 109 110 extern vorbis_info *ov_info(OggVorbis_File *vf,int link); 111 extern vorbis_comment *ov_comment(OggVorbis_File *vf,int link); 112 113 extern long ov_read(OggVorbis_File *vf,void *buffer,int length, 114 int *bitstream); 115 116 #ifdef __cplusplus 117 } 118 #endif /* __cplusplus */ 119 120 #endif 121 122 123