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 1994-2002 * 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 #define CHUNKSIZE 1024 30 /* The function prototypes for the callbacks are basically the same as for 31 * the stdio functions fread, fseek, fclose, ftell. 32 * The one difference is that the FILE * arguments have been replaced with 33 * a void * - this is to be used as a pointer to whatever internal data these 34 * functions might need. In the stdio case, it's just a FILE * cast to a void * 35 * 36 * If you use other functions, check the docs for these functions and return 37 * the right values. For seek_func(), you *MUST* return -1 if the stream is 38 * unseekable 39 */ 40 typedef struct { 41 size_t (*read_func) (void *ptr, size_t size, size_t nmemb, void *datasource); 42 int (*seek_func) (void *datasource, int64_t offset, int whence); 43 int (*close_func) (void *datasource); 44 long (*tell_func) (void *datasource); 45 } ov_callbacks; 46 47 #define NOTOPEN 0 48 #define PARTOPEN 1 49 #define OPENED 2 50 #define STREAMSET 3 51 #define INITSET 4 52 53 typedef struct OggVorbis_File { 54 void *datasource; /* Pointer to a FILE *, etc. */ 55 int seekable; 56 int64_t offset; 57 int64_t end; 58 ogg_sync_state oy; 59 60 /* If the FILE handle isn't seekable (eg, a pipe), only the current 61 stream appears */ 62 int links; 63 int64_t *offsets; 64 int64_t *dataoffsets; 65 uint32_t *serialnos; 66 int64_t *pcmlengths; 67 vorbis_info *vi; 68 vorbis_comment *vc; 69 70 /* Decoding working state local storage */ 71 int64_t pcm_offset; 72 int ready_state; 73 uint32_t current_serialno; 74 int current_link; 75 76 int64_t bittrack; 77 int64_t samptrack; 78 79 ogg_stream_state os; /* take physical pages, weld into a logical 80 stream of packets */ 81 vorbis_dsp_state vd; /* central working state for the packet->PCM decoder */ 82 vorbis_block vb; /* local working space for packet->PCM decode */ 83 84 ov_callbacks callbacks; 85 86 } OggVorbis_File; 87 88 extern int ov_clear(OggVorbis_File *vf); 89 extern int ov_open(FILE *f,OggVorbis_File *vf,const char *initial,long ibytes); 90 extern int ov_open_callbacks(void *datasource, OggVorbis_File *vf, 91 const char *initial, long ibytes, ov_callbacks callbacks); 92 93 extern int ov_test(FILE *f,OggVorbis_File *vf,const char *initial,long ibytes); 94 extern int ov_test_callbacks(void *datasource, OggVorbis_File *vf, 95 const char *initial, long ibytes, ov_callbacks callbacks); 96 extern int ov_test_open(OggVorbis_File *vf); 97 98 extern long ov_bitrate(OggVorbis_File *vf,int i); 99 extern long ov_bitrate_instant(OggVorbis_File *vf); 100 extern long ov_streams(OggVorbis_File *vf); 101 extern long ov_seekable(OggVorbis_File *vf); 102 extern long ov_serialnumber(OggVorbis_File *vf,int i); 103 104 extern int64_t ov_raw_total(OggVorbis_File *vf,int i); 105 extern int64_t ov_pcm_total(OggVorbis_File *vf,int i); 106 extern int64_t ov_time_total(OggVorbis_File *vf,int i); 107 108 extern int ov_raw_seek(OggVorbis_File *vf,int64_t pos); 109 extern int ov_pcm_seek(OggVorbis_File *vf,int64_t pos); 110 extern int ov_pcm_seek_page(OggVorbis_File *vf,int64_t pos); 111 extern int ov_time_seek(OggVorbis_File *vf,int64_t pos); 112 extern int ov_time_seek_page(OggVorbis_File *vf,int64_t pos); 113 114 extern int64_t ov_raw_tell(OggVorbis_File *vf); 115 extern int64_t ov_pcm_tell(OggVorbis_File *vf); 116 extern int64_t ov_time_tell(OggVorbis_File *vf); 117 118 extern vorbis_info *ov_info(OggVorbis_File *vf,int link); 119 extern vorbis_comment *ov_comment(OggVorbis_File *vf,int link); 120 121 extern long ov_read(OggVorbis_File *vf,char *buffer,int length, 122 int *bitstream); 123 124 #ifdef __cplusplus 125 } 126 #endif /* __cplusplus */ 127 128 #endif 129 130 131