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);
55 return fseeko64(f,off,whence);
56 #elif defined (_WIN32)
57 return _fseeki64(f,off,whence);
59 return fseek(f,off,whence);
63 /* These structs below (OV_CALLBACKS_DEFAULT etc) are defined here as
64 * static data. That means that every file which includes this header
65 * will get its own copy of these structs whether it uses them or
66 * not. This is essential on platforms such as Windows on which
67 * several different versions of stdio support may be linked to by
68 * different DLLs, and we need to be certain we know which one we're
69 * using (the same one as the main application).
72 static ov_callbacks OV_CALLBACKS_DEFAULT = {
73 (size_t (*)(void *, size_t, size_t, void *)) fread,
74 (int (*)(void *, ogg_int64_t, int)) _ov_header_fseek_wrap,
75 (int (*)(void *)) fclose,
76 (long (*)(void *)) ftell
79 static ov_callbacks OV_CALLBACKS_NOCLOSE = {
80 (size_t (*)(void *, size_t, size_t, void *)) fread,
81 (int (*)(void *, ogg_int64_t, int)) _ov_header_fseek_wrap,
82 (int (*)(void *)) NULL,
83 (long (*)(void *)) ftell
86 static ov_callbacks OV_CALLBACKS_STREAMONLY = {
87 (size_t (*)(void *, size_t, size_t, void *)) fread,
88 (int (*)(void *, ogg_int64_t, int)) NULL,
89 (int (*)(void *)) fclose,
90 (long (*)(void *)) NULL
93 static ov_callbacks OV_CALLBACKS_STREAMONLY_NOCLOSE = {
94 (size_t (*)(void *, size_t, size_t, void *)) fread,
95 (int (*)(void *, ogg_int64_t, int)) NULL,
96 (int (*)(void *)) NULL,
97 (long (*)(void *)) NULL
106 typedef struct OggVorbis_File {
107 void *datasource; /* Pointer to a FILE *, etc. */
113 /* If the FILE handle isn't seekable (eg, a pipe), only the current
116 ogg_int64_t *offsets;
117 ogg_int64_t *dataoffsets;
119 ogg_int64_t *pcmlengths; /* overloaded to maintain binary
120 compatability; x2 size, stores both
121 beginning and end values */
125 /* Decoding working state local storage */
126 ogg_int64_t pcm_offset;
128 long current_serialno;
134 ogg_stream_state os; /* take physical pages, weld into a logical
136 vorbis_dsp_state vd; /* central working state for the packet->PCM decoder */
137 vorbis_block vb; /* local working space for packet->PCM decode */
139 ov_callbacks callbacks;
144 extern int ov_clear(OggVorbis_File *vf);
145 extern int ov_fopen(char *path,OggVorbis_File *vf);
146 extern int ov_open(FILE *f,OggVorbis_File *vf,char *initial,long ibytes);
147 extern int ov_open_callbacks(void *datasource, OggVorbis_File *vf,
148 char *initial, long ibytes, ov_callbacks callbacks);
150 extern int ov_test(FILE *f,OggVorbis_File *vf,char *initial,long ibytes);
151 extern int ov_test_callbacks(void *datasource, OggVorbis_File *vf,
152 char *initial, long ibytes, ov_callbacks callbacks);
153 extern int ov_test_open(OggVorbis_File *vf);
155 extern long ov_bitrate(OggVorbis_File *vf,int i);
156 extern long ov_bitrate_instant(OggVorbis_File *vf);
157 extern long ov_streams(OggVorbis_File *vf);
158 extern long ov_seekable(OggVorbis_File *vf);
159 extern long ov_serialnumber(OggVorbis_File *vf,int i);
161 extern ogg_int64_t ov_raw_total(OggVorbis_File *vf,int i);
162 extern ogg_int64_t ov_pcm_total(OggVorbis_File *vf,int i);
163 extern double ov_time_total(OggVorbis_File *vf,int i);
165 extern int ov_raw_seek(OggVorbis_File *vf,ogg_int64_t pos);
166 extern int ov_pcm_seek(OggVorbis_File *vf,ogg_int64_t pos);
167 extern int ov_pcm_seek_page(OggVorbis_File *vf,ogg_int64_t pos);
168 extern int ov_time_seek(OggVorbis_File *vf,double pos);
169 extern int ov_time_seek_page(OggVorbis_File *vf,double pos);
171 extern int ov_raw_seek_lap(OggVorbis_File *vf,ogg_int64_t pos);
172 extern int ov_pcm_seek_lap(OggVorbis_File *vf,ogg_int64_t pos);
173 extern int ov_pcm_seek_page_lap(OggVorbis_File *vf,ogg_int64_t pos);
174 extern int ov_time_seek_lap(OggVorbis_File *vf,double pos);
175 extern int ov_time_seek_page_lap(OggVorbis_File *vf,double pos);
177 extern ogg_int64_t ov_raw_tell(OggVorbis_File *vf);
178 extern ogg_int64_t ov_pcm_tell(OggVorbis_File *vf);
179 extern double ov_time_tell(OggVorbis_File *vf);
181 extern vorbis_info *ov_info(OggVorbis_File *vf,int link);
182 extern vorbis_comment *ov_comment(OggVorbis_File *vf,int link);
184 extern long ov_read_float(OggVorbis_File *vf,float ***pcm_channels,int samples,
186 extern long ov_read_filter(OggVorbis_File *vf,char *buffer,int length,
187 int bigendianp,int word,int sgned,int *bitstream,
188 void (*filter)(float **pcm,long channels,long samples,void *filter_param),void *filter_param);
189 extern long ov_read(OggVorbis_File *vf,char *buffer,int length,
190 int bigendianp,int word,int sgned,int *bitstream);
191 extern int ov_crosslap(OggVorbis_File *vf1,OggVorbis_File *vf2);
193 extern int ov_halfrate(OggVorbis_File *vf,int flag);
194 extern int ov_halfrate_p(OggVorbis_File *vf);
198 #endif /* __cplusplus */