1 | /******************************************************************** |
2 | * * |
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. * |
7 | * * |
8 | * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2007 * |
9 | * by the Xiph.Org Foundation http://www.xiph.org/ * |
10 | * * |
11 | ******************************************************************** |
12 | |
13 | function: stdio-based convenience library for opening/seeking/decoding |
14 | last mod: $Id: vorbisfile.h 17182 2010-04-29 03:48:32Z xiphmont $ |
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 "codec.h" |
28 | |
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 * |
34 | * |
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 |
37 | * unseekable |
38 | */ |
39 | typedef struct { |
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); |
44 | } ov_callbacks; |
45 | |
46 | #ifndef OV_EXCLUDE_STATIC_CALLBACKS |
47 | |
48 | /* a few sets of convenient callbacks, especially for use under |
49 | * Windows where ov_open_callbacks() should always be used instead of |
50 | * ov_open() to avoid problems with incompatible crt.o version linking |
51 | * issues. */ |
52 | |
53 | static int (FILE *f,ogg_int64_t off,int whence){ |
54 | if(f==NULL)return(-1); |
55 | |
56 | #ifdef __MINGW32__ |
57 | return fseeko64(f,off,whence); |
58 | #elif defined (_WIN32) |
59 | return _fseeki64(f,off,whence); |
60 | #else |
61 | return fseek(f,off,whence); |
62 | #endif |
63 | } |
64 | |
65 | /* These structs below (OV_CALLBACKS_DEFAULT etc) are defined here as |
66 | * static data. That means that every file which includes this header |
67 | * will get its own copy of these structs whether it uses them or |
68 | * not unless it #defines OV_EXCLUDE_STATIC_CALLBACKS. |
69 | * These static symbols are essential on platforms such as Windows on |
70 | * which several different versions of stdio support may be linked to |
71 | * by different DLLs, and we need to be certain we know which one |
72 | * we're using (the same one as the main application). |
73 | */ |
74 | |
75 | static ov_callbacks OV_CALLBACKS_DEFAULT = { |
76 | (size_t (*)(void *, size_t, size_t, void *)) fread, |
77 | (int (*)(void *, ogg_int64_t, int)) _ov_header_fseek_wrap, |
78 | (int (*)(void *)) fclose, |
79 | (long (*)(void *)) ftell |
80 | }; |
81 | |
82 | static ov_callbacks OV_CALLBACKS_NOCLOSE = { |
83 | (size_t (*)(void *, size_t, size_t, void *)) fread, |
84 | (int (*)(void *, ogg_int64_t, int)) _ov_header_fseek_wrap, |
85 | (int (*)(void *)) NULL, |
86 | (long (*)(void *)) ftell |
87 | }; |
88 | |
89 | static ov_callbacks OV_CALLBACKS_STREAMONLY = { |
90 | (size_t (*)(void *, size_t, size_t, void *)) fread, |
91 | (int (*)(void *, ogg_int64_t, int)) NULL, |
92 | (int (*)(void *)) fclose, |
93 | (long (*)(void *)) NULL |
94 | }; |
95 | |
96 | static ov_callbacks OV_CALLBACKS_STREAMONLY_NOCLOSE = { |
97 | (size_t (*)(void *, size_t, size_t, void *)) fread, |
98 | (int (*)(void *, ogg_int64_t, int)) NULL, |
99 | (int (*)(void *)) NULL, |
100 | (long (*)(void *)) NULL |
101 | }; |
102 | |
103 | #endif |
104 | |
105 | #define NOTOPEN 0 |
106 | #define PARTOPEN 1 |
107 | #define OPENED 2 |
108 | #define STREAMSET 3 |
109 | #define INITSET 4 |
110 | |
111 | typedef struct OggVorbis_File { |
112 | void *datasource; /* Pointer to a FILE *, etc. */ |
113 | int seekable; |
114 | ogg_int64_t offset; |
115 | ogg_int64_t end; |
116 | ogg_sync_state oy; |
117 | |
118 | /* If the FILE handle isn't seekable (eg, a pipe), only the current |
119 | stream appears */ |
120 | int links; |
121 | ogg_int64_t *offsets; |
122 | ogg_int64_t *dataoffsets; |
123 | long *serialnos; |
124 | ogg_int64_t *pcmlengths; /* overloaded to maintain binary |
125 | compatibility; x2 size, stores both |
126 | beginning and end values */ |
127 | vorbis_info *vi; |
128 | vorbis_comment *vc; |
129 | |
130 | /* Decoding working state local storage */ |
131 | ogg_int64_t pcm_offset; |
132 | int ready_state; |
133 | long current_serialno; |
134 | int current_link; |
135 | |
136 | double bittrack; |
137 | double samptrack; |
138 | |
139 | ogg_stream_state os; /* take physical pages, weld into a logical |
140 | stream of packets */ |
141 | vorbis_dsp_state vd; /* central working state for the packet->PCM decoder */ |
142 | vorbis_block vb; /* local working space for packet->PCM decode */ |
143 | |
144 | ov_callbacks callbacks; |
145 | |
146 | } OggVorbis_File; |
147 | |
148 | |
149 | extern int ov_clear(OggVorbis_File *vf); |
150 | extern int ov_fopen(const char *path,OggVorbis_File *vf); |
151 | extern int ov_open(FILE *f,OggVorbis_File *vf,const char *initial,long ibytes); |
152 | extern int ov_open_callbacks(void *datasource, OggVorbis_File *vf, |
153 | const char *initial, long ibytes, ov_callbacks callbacks); |
154 | |
155 | extern int ov_test(FILE *f,OggVorbis_File *vf,const char *initial,long ibytes); |
156 | extern int ov_test_callbacks(void *datasource, OggVorbis_File *vf, |
157 | const char *initial, long ibytes, ov_callbacks callbacks); |
158 | extern int ov_test_open(OggVorbis_File *vf); |
159 | |
160 | extern long ov_bitrate(OggVorbis_File *vf,int i); |
161 | extern long ov_bitrate_instant(OggVorbis_File *vf); |
162 | extern long ov_streams(OggVorbis_File *vf); |
163 | extern long ov_seekable(OggVorbis_File *vf); |
164 | extern long ov_serialnumber(OggVorbis_File *vf,int i); |
165 | |
166 | extern ogg_int64_t ov_raw_total(OggVorbis_File *vf,int i); |
167 | extern ogg_int64_t ov_pcm_total(OggVorbis_File *vf,int i); |
168 | extern double ov_time_total(OggVorbis_File *vf,int i); |
169 | |
170 | extern int ov_raw_seek(OggVorbis_File *vf,ogg_int64_t pos); |
171 | extern int ov_pcm_seek(OggVorbis_File *vf,ogg_int64_t pos); |
172 | extern int ov_pcm_seek_page(OggVorbis_File *vf,ogg_int64_t pos); |
173 | extern int ov_time_seek(OggVorbis_File *vf,double pos); |
174 | extern int ov_time_seek_page(OggVorbis_File *vf,double pos); |
175 | |
176 | extern int ov_raw_seek_lap(OggVorbis_File *vf,ogg_int64_t pos); |
177 | extern int ov_pcm_seek_lap(OggVorbis_File *vf,ogg_int64_t pos); |
178 | extern int ov_pcm_seek_page_lap(OggVorbis_File *vf,ogg_int64_t pos); |
179 | extern int ov_time_seek_lap(OggVorbis_File *vf,double pos); |
180 | extern int ov_time_seek_page_lap(OggVorbis_File *vf,double pos); |
181 | |
182 | extern ogg_int64_t ov_raw_tell(OggVorbis_File *vf); |
183 | extern ogg_int64_t ov_pcm_tell(OggVorbis_File *vf); |
184 | extern double ov_time_tell(OggVorbis_File *vf); |
185 | |
186 | extern vorbis_info *ov_info(OggVorbis_File *vf,int link); |
187 | extern vorbis_comment *(OggVorbis_File *vf,int link); |
188 | |
189 | extern long ov_read_float(OggVorbis_File *vf,float ***pcm_channels,int samples, |
190 | int *bitstream); |
191 | extern long ov_read_filter(OggVorbis_File *vf,char *buffer,int length, |
192 | int bigendianp,int word,int sgned,int *bitstream, |
193 | void (*filter)(float **pcm,long channels,long samples,void *filter_param),void *filter_param); |
194 | extern long ov_read(OggVorbis_File *vf,char *buffer,int length, |
195 | int bigendianp,int word,int sgned,int *bitstream); |
196 | extern int ov_crosslap(OggVorbis_File *vf1,OggVorbis_File *vf2); |
197 | |
198 | extern int ov_halfrate(OggVorbis_File *vf,int flag); |
199 | extern int ov_halfrate_p(OggVorbis_File *vf); |
200 | |
201 | #ifdef __cplusplus |
202 | } |
203 | #endif /* __cplusplus */ |
204 | |
205 | #endif |
206 | |
207 | |