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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
22extern "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 */
40typedef struct {
41 size_t (*read_func) (void *ptr, size_t size, size_t nmemb, void *datasource);
42 int (*seek_func) (void *datasource, ogg_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
53typedef struct OggVorbis_File {
54 void *datasource; /* Pointer to a FILE *, etc. */
55 int seekable;
56 ogg_int64_t offset;
57 ogg_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 ogg_int64_t *offsets;
64 ogg_int64_t *dataoffsets;
65 ogg_uint32_t *serialnos;
66 ogg_int64_t *pcmlengths;
67 vorbis_info *vi;
68 vorbis_comment *vc;
69
70 /* Decoding working state local storage */
71 ogg_int64_t pcm_offset;
72 int ready_state;
73 ogg_uint32_t current_serialno;
74 int current_link;
75
76 ogg_int64_t bittrack;
77 ogg_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
88extern int ov_clear(OggVorbis_File *vf);
89extern int ov_open(FILE *f,OggVorbis_File *vf,char *initial,long ibytes);
90extern int ov_open_callbacks(void *datasource, OggVorbis_File *vf,
91 char *initial, long ibytes, ov_callbacks callbacks);
92
93extern int ov_test(FILE *f,OggVorbis_File *vf,char *initial,long ibytes);
94extern int ov_test_callbacks(void *datasource, OggVorbis_File *vf,
95 char *initial, long ibytes, ov_callbacks callbacks);
96extern int ov_test_open(OggVorbis_File *vf);
97
98extern long ov_bitrate(OggVorbis_File *vf,int i);
99extern long ov_bitrate_instant(OggVorbis_File *vf);
100extern long ov_streams(OggVorbis_File *vf);
101extern long ov_seekable(OggVorbis_File *vf);
102extern long ov_serialnumber(OggVorbis_File *vf,int i);
103
104extern ogg_int64_t ov_raw_total(OggVorbis_File *vf,int i);
105extern ogg_int64_t ov_pcm_total(OggVorbis_File *vf,int i);
106extern ogg_int64_t ov_time_total(OggVorbis_File *vf,int i);
107
108extern int ov_raw_seek(OggVorbis_File *vf,ogg_int64_t pos);
109extern int ov_pcm_seek(OggVorbis_File *vf,ogg_int64_t pos);
110extern int ov_pcm_seek_page(OggVorbis_File *vf,ogg_int64_t pos);
111extern int ov_time_seek(OggVorbis_File *vf,ogg_int64_t pos);
112extern int ov_time_seek_page(OggVorbis_File *vf,ogg_int64_t pos);
113
114extern ogg_int64_t ov_raw_tell(OggVorbis_File *vf);
115extern ogg_int64_t ov_pcm_tell(OggVorbis_File *vf);
116extern ogg_int64_t ov_time_tell(OggVorbis_File *vf);
117
118extern vorbis_info *ov_info(OggVorbis_File *vf,int link);
119extern vorbis_comment *ov_comment(OggVorbis_File *vf,int link);
120
121extern 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