1 /********************************************************************
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. *
8 * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2007 *
9 * by the Xiph.Org Foundation http://www.xiph.org/ *
11 ********************************************************************
13 function: stdio-based convenience library for opening/seeking/decoding
16 ********************************************************************/
24 #endif /* __cplusplus */
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 *
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
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);
46 /* a few sets of convenient callbacks, especially for use under
47 * Windows where ov_open_callbacks() should always be used instead of
48 * ov_open() to avoid problems with incompatable crt.o version linking
51 static int _ov_header_fseek_wrap(FILE *f,ogg_int64_t off,int whence){
52 if(f==NULL)return(-1);
53 return fseek(f,off,whence);
56 /* These structs below (OV_CALLBACKS_DEFAULT etc) are defined here as
57 * static data. That means that every file which includes this header
58 * will get its own copy of these structs whether it uses them or
59 * not. This is essential on platforms such as Windows on which
60 * several different versions of stdio support may be linked to by
61 * different DLLs, and we need to be certain we know which one we're
62 * using (the same one as the main application).
65 static ov_callbacks OV_CALLBACKS_DEFAULT = {
66 (size_t (*)(void *, size_t, size_t, void *)) fread,
67 (int (*)(void *, ogg_int64_t, int)) _ov_header_fseek_wrap,
68 (int (*)(void *)) fclose,
69 (long (*)(void *)) ftell
72 static ov_callbacks OV_CALLBACKS_NOCLOSE = {
73 (size_t (*)(void *, size_t, size_t, void *)) fread,
74 (int (*)(void *, ogg_int64_t, int)) _ov_header_fseek_wrap,
75 (int (*)(void *)) NULL,
76 (long (*)(void *)) ftell
79 static ov_callbacks OV_CALLBACKS_STREAMONLY = {
80 (size_t (*)(void *, size_t, size_t, void *)) fread,
81 (int (*)(void *, ogg_int64_t, int)) NULL,
82 (int (*)(void *)) fclose,
83 (long (*)(void *)) NULL
86 static ov_callbacks OV_CALLBACKS_STREAMONLY_NOCLOSE = {
87 (size_t (*)(void *, size_t, size_t, void *)) fread,
88 (int (*)(void *, ogg_int64_t, int)) NULL,
89 (int (*)(void *)) NULL,
90 (long (*)(void *)) NULL
99 typedef struct OggVorbis_File {
100 void *datasource; /* Pointer to a FILE *, etc. */
106 /* If the FILE handle isn't seekable (eg, a pipe), only the current
109 ogg_int64_t *offsets;
110 ogg_int64_t *dataoffsets;
112 ogg_int64_t *pcmlengths; /* overloaded to maintain binary
113 compatability; x2 size, stores both
114 beginning and end values */
118 /* Decoding working state local storage */
119 ogg_int64_t pcm_offset;
121 long current_serialno;
127 ogg_stream_state os; /* take physical pages, weld into a logical
129 vorbis_dsp_state vd; /* central working state for the packet->PCM decoder */
130 vorbis_block vb; /* local working space for packet->PCM decode */
132 ov_callbacks callbacks;
137 extern int ov_clear(OggVorbis_File *vf);
138 extern int ov_fopen(char *path,OggVorbis_File *vf);
139 extern int ov_open(FILE *f,OggVorbis_File *vf,char *initial,long ibytes);
140 extern int ov_open_callbacks(void *datasource, OggVorbis_File *vf,
141 char *initial, long ibytes, ov_callbacks callbacks);
143 extern int ov_test(FILE *f,OggVorbis_File *vf,char *initial,long ibytes);
144 extern int ov_test_callbacks(void *datasource, OggVorbis_File *vf,
145 char *initial, long ibytes, ov_callbacks callbacks);
146 extern int ov_test_open(OggVorbis_File *vf);
148 extern long ov_bitrate(OggVorbis_File *vf,int i);
149 extern long ov_bitrate_instant(OggVorbis_File *vf);
150 extern long ov_streams(OggVorbis_File *vf);
151 extern long ov_seekable(OggVorbis_File *vf);
152 extern long ov_serialnumber(OggVorbis_File *vf,int i);
154 extern ogg_int64_t ov_raw_total(OggVorbis_File *vf,int i);
155 extern ogg_int64_t ov_pcm_total(OggVorbis_File *vf,int i);
156 extern double ov_time_total(OggVorbis_File *vf,int i);
158 extern int ov_raw_seek(OggVorbis_File *vf,ogg_int64_t pos);
159 extern int ov_pcm_seek(OggVorbis_File *vf,ogg_int64_t pos);
160 extern int ov_pcm_seek_page(OggVorbis_File *vf,ogg_int64_t pos);
161 extern int ov_time_seek(OggVorbis_File *vf,double pos);
162 extern int ov_time_seek_page(OggVorbis_File *vf,double pos);
164 extern int ov_raw_seek_lap(OggVorbis_File *vf,ogg_int64_t pos);
165 extern int ov_pcm_seek_lap(OggVorbis_File *vf,ogg_int64_t pos);
166 extern int ov_pcm_seek_page_lap(OggVorbis_File *vf,ogg_int64_t pos);
167 extern int ov_time_seek_lap(OggVorbis_File *vf,double pos);
168 extern int ov_time_seek_page_lap(OggVorbis_File *vf,double pos);
170 extern ogg_int64_t ov_raw_tell(OggVorbis_File *vf);
171 extern ogg_int64_t ov_pcm_tell(OggVorbis_File *vf);
172 extern double ov_time_tell(OggVorbis_File *vf);
174 extern vorbis_info *ov_info(OggVorbis_File *vf,int link);
175 extern vorbis_comment *ov_comment(OggVorbis_File *vf,int link);
177 extern long ov_read_float(OggVorbis_File *vf,float ***pcm_channels,int samples,
179 extern long ov_read(OggVorbis_File *vf,char *buffer,int length,
180 int bigendianp,int word,int sgned,int *bitstream);
181 extern int ov_crosslap(OggVorbis_File *vf1,OggVorbis_File *vf2);
183 extern int ov_halfrate(OggVorbis_File *vf,int flag);
184 extern int ov_halfrate_p(OggVorbis_File *vf);
188 #endif /* __cplusplus */