media/libvorbis/include/vorbis/codec.h@6474c204b198
media/libvorbis/include/vorbis/codec.h
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
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 1994-2001 *
9 * by the Xiph.Org Foundation http://www.xiph.org/ *
11 ********************************************************************
13 function: libvorbis codec headers
14 last mod: $Id: codec.h 17021 2010-03-24 09:29:41Z xiphmont $
16 ********************************************************************/
18 #ifndef _vorbis_codec_h_
19 #define _vorbis_codec_h_
21 #ifdef __cplusplus
22 extern "C"
23 {
24 #endif /* __cplusplus */
26 #include <ogg/ogg.h>
28 typedef struct vorbis_info{
29 int version;
30 int channels;
31 long rate;
33 /* The below bitrate declarations are *hints*.
34 Combinations of the three values carry the following implications:
36 all three set to the same value:
37 implies a fixed rate bitstream
38 only nominal set:
39 implies a VBR stream that averages the nominal bitrate. No hard
40 upper/lower limit
41 upper and or lower set:
42 implies a VBR bitstream that obeys the bitrate limits. nominal
43 may also be set to give a nominal rate.
44 none set:
45 the coder does not care to speculate.
46 */
48 long bitrate_upper;
49 long bitrate_nominal;
50 long bitrate_lower;
51 long bitrate_window;
53 void *codec_setup;
54 } vorbis_info;
56 /* vorbis_dsp_state buffers the current vorbis audio
57 analysis/synthesis state. The DSP state belongs to a specific
58 logical bitstream ****************************************************/
59 typedef struct vorbis_dsp_state{
60 int analysisp;
61 vorbis_info *vi;
63 float **pcm;
64 float **pcmret;
65 int pcm_storage;
66 int pcm_current;
67 int pcm_returned;
69 int preextrapolate;
70 int eofflag;
72 long lW;
73 long W;
74 long nW;
75 long centerW;
77 ogg_int64_t granulepos;
78 ogg_int64_t sequence;
80 ogg_int64_t glue_bits;
81 ogg_int64_t time_bits;
82 ogg_int64_t floor_bits;
83 ogg_int64_t res_bits;
85 void *backend_state;
86 } vorbis_dsp_state;
88 typedef struct vorbis_block{
89 /* necessary stream state for linking to the framing abstraction */
90 float **pcm; /* this is a pointer into local storage */
91 oggpack_buffer opb;
93 long lW;
94 long W;
95 long nW;
96 int pcmend;
97 int mode;
99 int eofflag;
100 ogg_int64_t granulepos;
101 ogg_int64_t sequence;
102 vorbis_dsp_state *vd; /* For read-only access of configuration */
104 /* local storage to avoid remallocing; it's up to the mapping to
105 structure it */
106 void *localstore;
107 long localtop;
108 long localalloc;
109 long totaluse;
110 struct alloc_chain *reap;
112 /* bitmetrics for the frame */
113 long glue_bits;
114 long time_bits;
115 long floor_bits;
116 long res_bits;
118 void *internal;
120 } vorbis_block;
122 /* vorbis_block is a single block of data to be processed as part of
123 the analysis/synthesis stream; it belongs to a specific logical
124 bitstream, but is independent from other vorbis_blocks belonging to
125 that logical bitstream. *************************************************/
127 struct alloc_chain{
128 void *ptr;
129 struct alloc_chain *next;
130 };
132 /* vorbis_info contains all the setup information specific to the
133 specific compression/decompression mode in progress (eg,
134 psychoacoustic settings, channel setup, options, codebook
135 etc). vorbis_info and substructures are in backends.h.
136 *********************************************************************/
138 /* the comments are not part of vorbis_info so that vorbis_info can be
139 static storage */
140 typedef struct vorbis_comment{
141 /* unlimited user comment fields. libvorbis writes 'libvorbis'
142 whatever vendor is set to in encode */
143 char **user_comments;
144 int *comment_lengths;
145 int comments;
146 char *vendor;
148 } vorbis_comment;
151 /* libvorbis encodes in two abstraction layers; first we perform DSP
152 and produce a packet (see docs/analysis.txt). The packet is then
153 coded into a framed OggSquish bitstream by the second layer (see
154 docs/framing.txt). Decode is the reverse process; we sync/frame
155 the bitstream and extract individual packets, then decode the
156 packet back into PCM audio.
158 The extra framing/packetizing is used in streaming formats, such as
159 files. Over the net (such as with UDP), the framing and
160 packetization aren't necessary as they're provided by the transport
161 and the streaming layer is not used */
163 /* Vorbis PRIMITIVES: general ***************************************/
165 extern void vorbis_info_init(vorbis_info *vi);
166 extern void vorbis_info_clear(vorbis_info *vi);
167 extern int vorbis_info_blocksize(vorbis_info *vi,int zo);
168 extern void vorbis_comment_init(vorbis_comment *vc);
169 extern void vorbis_comment_add(vorbis_comment *vc, const char *comment);
170 extern void vorbis_comment_add_tag(vorbis_comment *vc,
171 const char *tag, const char *contents);
172 extern char *vorbis_comment_query(vorbis_comment *vc, const char *tag, int count);
173 extern int vorbis_comment_query_count(vorbis_comment *vc, const char *tag);
174 extern void vorbis_comment_clear(vorbis_comment *vc);
176 extern int vorbis_block_init(vorbis_dsp_state *v, vorbis_block *vb);
177 extern int vorbis_block_clear(vorbis_block *vb);
178 extern void vorbis_dsp_clear(vorbis_dsp_state *v);
179 extern double vorbis_granule_time(vorbis_dsp_state *v,
180 ogg_int64_t granulepos);
182 extern const char *vorbis_version_string(void);
184 /* Vorbis PRIMITIVES: analysis/DSP layer ****************************/
186 extern int vorbis_analysis_init(vorbis_dsp_state *v,vorbis_info *vi);
187 extern int vorbis_commentheader_out(vorbis_comment *vc, ogg_packet *op);
188 extern int vorbis_analysis_headerout(vorbis_dsp_state *v,
189 vorbis_comment *vc,
190 ogg_packet *op,
191 ogg_packet *op_comm,
192 ogg_packet *op_code);
193 extern float **vorbis_analysis_buffer(vorbis_dsp_state *v,int vals);
194 extern int vorbis_analysis_wrote(vorbis_dsp_state *v,int vals);
195 extern int vorbis_analysis_blockout(vorbis_dsp_state *v,vorbis_block *vb);
196 extern int vorbis_analysis(vorbis_block *vb,ogg_packet *op);
198 extern int vorbis_bitrate_addblock(vorbis_block *vb);
199 extern int vorbis_bitrate_flushpacket(vorbis_dsp_state *vd,
200 ogg_packet *op);
202 /* Vorbis PRIMITIVES: synthesis layer *******************************/
203 extern int vorbis_synthesis_idheader(ogg_packet *op);
204 extern int vorbis_synthesis_headerin(vorbis_info *vi,vorbis_comment *vc,
205 ogg_packet *op);
207 extern int vorbis_synthesis_init(vorbis_dsp_state *v,vorbis_info *vi);
208 extern int vorbis_synthesis_restart(vorbis_dsp_state *v);
209 extern int vorbis_synthesis(vorbis_block *vb,ogg_packet *op);
210 extern int vorbis_synthesis_trackonly(vorbis_block *vb,ogg_packet *op);
211 extern int vorbis_synthesis_blockin(vorbis_dsp_state *v,vorbis_block *vb);
212 extern int vorbis_synthesis_pcmout(vorbis_dsp_state *v,float ***pcm);
213 extern int vorbis_synthesis_lapout(vorbis_dsp_state *v,float ***pcm);
214 extern int vorbis_synthesis_read(vorbis_dsp_state *v,int samples);
215 extern long vorbis_packet_blocksize(vorbis_info *vi,ogg_packet *op);
217 extern int vorbis_synthesis_halfrate(vorbis_info *v,int flag);
218 extern int vorbis_synthesis_halfrate_p(vorbis_info *v);
220 /* Vorbis ERRORS and return codes ***********************************/
222 #define OV_FALSE -1
223 #define OV_EOF -2
224 #define OV_HOLE -3
226 #define OV_EREAD -128
227 #define OV_EFAULT -129
228 #define OV_EIMPL -130
229 #define OV_EINVAL -131
230 #define OV_ENOTVORBIS -132
231 #define OV_EBADHEADER -133
232 #define OV_EVERSION -134
233 #define OV_ENOTAUDIO -135
234 #define OV_EBADPACKET -136
235 #define OV_EBADLINK -137
236 #define OV_ENOSEEK -138
238 #ifdef __cplusplus
239 }
240 #endif /* __cplusplus */
242 #endif
