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 65535 30 #define READSIZE 1024 31 /* The function prototypes for the callbacks are basically the same as for 32 * the stdio functions fread, fseek, fclose, ftell. 33 * The one difference is that the FILE * arguments have been replaced with 34 * a void * - this is to be used as a pointer to whatever internal data these 35 * functions might need. In the stdio case, it's just a FILE * cast to a void * 36 * 37 * If you use other functions, check the docs for these functions and return 38 * the right values. For seek_func(), you *MUST* return -1 if the stream is 39 * unseekable 40 */ 41 typedef struct { 42 size_t (*read_func) (void *ptr, size_t size, size_t nmemb, void *datasource); 43 int (*seek_func) (void *datasource, ogg_int64_t offset, int whence); 44 int (*close_func) (void *datasource); 45 long (*tell_func) (void *datasource); 46 } ov_callbacks; 47 48 #define NOTOPEN 0 49 #define PARTOPEN 1 50 #define OPENED 2 51 #define STREAMSET 3 52 #define INITSET 4 53 54 typedef struct OggVorbis_File { 55 void *datasource; /* Pointer to a FILE *, etc. */ 56 int seekable; 57 ogg_int64_t offset; 58 ogg_int64_t end; 59 ogg_sync_state oy; 60 61 /* If the FILE handle isn't seekable (eg, a pipe), only the current 62 stream appears */ 63 int links; 64 ogg_int64_t *offsets; 65 ogg_int64_t *dataoffsets; 66 ogg_uint32_t *serialnos; 67 ogg_int64_t *pcmlengths; 68 vorbis_info *vi; 69 vorbis_comment *vc; 70 71 /* Decoding working state local storage */ 72 ogg_int64_t pcm_offset; 73 int ready_state; 74 ogg_uint32_t current_serialno; 75 int current_link; 76 77 ogg_int64_t bittrack; 78 ogg_int64_t samptrack; 79 80 ogg_stream_state os; /* take physical pages, weld into a logical 81 stream of packets */ 82 vorbis_dsp_state vd; /* central working state for the packet->PCM decoder */ 83 vorbis_block vb; /* local working space for packet->PCM decode */ 84 85 ov_callbacks callbacks; 86 87 } OggVorbis_File; 88 89 extern int ov_clear(OggVorbis_File *vf); 90 extern int ov_open(FILE *f,OggVorbis_File *vf,const char *initial,long ibytes); 91 extern int ov_open_callbacks(void *datasource, OggVorbis_File *vf, 92 const char *initial, long ibytes, ov_callbacks callbacks); 93 94 extern int ov_test(FILE *f,OggVorbis_File *vf,const char *initial,long ibytes); 95 extern int ov_test_callbacks(void *datasource, OggVorbis_File *vf, 96 const char *initial, long ibytes, ov_callbacks callbacks); 97 extern int ov_test_open(OggVorbis_File *vf); 98 99 extern long ov_bitrate(OggVorbis_File *vf,int i); 100 extern long ov_bitrate_instant(OggVorbis_File *vf); 101 extern long ov_streams(OggVorbis_File *vf); 102 extern long ov_seekable(OggVorbis_File *vf); 103 extern long ov_serialnumber(OggVorbis_File *vf,int i); 104 105 extern ogg_int64_t ov_raw_total(OggVorbis_File *vf,int i); 106 extern ogg_int64_t ov_pcm_total(OggVorbis_File *vf,int i); 107 extern ogg_int64_t ov_time_total(OggVorbis_File *vf,int i); 108 109 extern int ov_raw_seek(OggVorbis_File *vf,ogg_int64_t pos); 110 extern int ov_pcm_seek(OggVorbis_File *vf,ogg_int64_t pos); 111 extern int ov_pcm_seek_page(OggVorbis_File *vf,ogg_int64_t pos); 112 extern int ov_time_seek(OggVorbis_File *vf,ogg_int64_t pos); 113 extern int ov_time_seek_page(OggVorbis_File *vf,ogg_int64_t pos); 114 115 extern ogg_int64_t ov_raw_tell(OggVorbis_File *vf); 116 extern ogg_int64_t ov_pcm_tell(OggVorbis_File *vf); 117 extern ogg_int64_t ov_time_tell(OggVorbis_File *vf); 118 119 extern vorbis_info *ov_info(OggVorbis_File *vf,int link); 120 extern vorbis_comment *ov_comment(OggVorbis_File *vf,int link); 121 122 extern long ov_read(OggVorbis_File *vf,char *buffer,int length, 123 int *bitstream); 124 125 #ifdef __cplusplus 126 } 127 #endif /* __cplusplus */ 128 129 #endif 130 131 132