[6fa58e]: src / libxineadec / xine_vorbis_decoder.c  Maximize  Restore  History

Download this file

354 lines (258 with data), 9.6 kB

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
/*
* Copyright (C) 2000-2003 the xine project
*
* This file is part of xine, a free video player.
*
* xine is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* xine is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
*
* (ogg/)vorbis audio decoder plugin (libvorbis wrapper) for xine
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include <string.h>
#define LOG_MODULE "vorbis_decoder"
#define LOG_VERBOSE
/*
#define LOG
*/
#include "xine_internal.h"
#include "audio_out.h"
#include "buffer.h"
#include <ogg/ogg.h>
#include <vorbis/codec.h>
#define MAX_NUM_SAMPLES 4096
typedef struct {
audio_decoder_class_t decoder_class;
} vorbis_class_t;
typedef struct vorbis_decoder_s {
audio_decoder_t audio_decoder;
int64_t pts;
int output_sampling_rate;
int output_open;
int output_mode;
ogg_packet op; /* we must use this struct to sent data to libvorbis */
/* vorbis stuff */
vorbis_info vi; /* stores static vorbis bitstream settings */
vorbis_comment vc;
vorbis_dsp_state vd; /* central working state for packet->PCM decoder */
vorbis_block vb; /* local working state for packet->PCM decoder */
int16_t convbuffer[MAX_NUM_SAMPLES];
int convsize;
int header_count;
xine_stream_t *stream;
} vorbis_decoder_t;
static void vorbis_reset (audio_decoder_t *this_gen) {
vorbis_decoder_t *this = (vorbis_decoder_t *) this_gen;
if( this->header_count ) return;
/* clear block first, as it might contain allocated data */
vorbis_block_clear(&this->vb);
vorbis_block_init(&this->vd,&this->vb);
}
static void vorbis_discontinuity (audio_decoder_t *this_gen) {
vorbis_decoder_t *this = (vorbis_decoder_t *) this_gen;
this->pts=0;
}
/* Known vorbis comment keys from ogg123 sources*/
static struct {
char *key; /* includes the '=' for programming convenience */
int xine_metainfo_index;
} vorbis_comment_keys[] = {
{"ARTIST=", XINE_META_INFO_ARTIST},
{"ALBUM=", XINE_META_INFO_ALBUM},
{"TITLE=", XINE_META_INFO_TITLE},
{"GENRE=", XINE_META_INFO_GENRE},
{"DESCRIPTION=", XINE_META_INFO_COMMENT},
{"COMMENT=", XINE_META_INFO_COMMENT},
{"DATE=", XINE_META_INFO_YEAR},
{"TRACKNUMBER=", XINE_META_INFO_TRACK_NUMBER},
{NULL, 0}
};
static void get_metadata (vorbis_decoder_t *this) {
char **ptr=this->vc.user_comments;
while(*ptr){
char *comment = *ptr;
int i;
lprintf("%s\n", comment);
for (i = 0; vorbis_comment_keys[i].key != NULL; i++) {
if ( !strncasecmp (vorbis_comment_keys[i].key, comment,
strlen(vorbis_comment_keys[i].key)) ) {
lprintf ("known metadata %d %d\n",
i, vorbis_comment_keys[i].xine_metainfo_index);
_x_meta_info_set_utf8(this->stream, vorbis_comment_keys[i].xine_metainfo_index,
comment + strlen(vorbis_comment_keys[i].key));
}
}
++ptr;
}
_x_meta_info_set_utf8(this->stream, XINE_META_INFO_AUDIOCODEC, "vorbis");
}
static void vorbis_decode_data (audio_decoder_t *this_gen, buf_element_t *buf) {
vorbis_decoder_t *this = (vorbis_decoder_t *) this_gen;
memset( &this->op, 0, sizeof(this->op) );
this->op.packet = buf->content;
this->op.bytes = buf->size;
if ( (buf->decoder_flags & BUF_FLAG_HEADER) &&
!(buf->decoder_flags & BUF_FLAG_STDHEADER) ) {
lprintf ("%d headers to go\n", this->header_count);
if (this->header_count) {
int res = 0;
if (this->header_count == 3)
this->op.b_o_s = 1;
if( (res = vorbis_synthesis_headerin(&this->vi,&this->vc,&this->op)) < 0 ){
/* error case; not a vorbis header */
xine_log(this->stream->xine, XINE_LOG_MSG, "libvorbis: this bitstream does not contain vorbis audio data. Following first 64 bytes (return: %d).\n", res);
xine_hexdump((char *)this->op.packet, this->op.bytes < 64 ? this->op.bytes : 64);
return;
}
this->header_count--;
if (!this->header_count) {
int mode = AO_CAP_MODE_MONO;
get_metadata (this);
mode = _x_ao_channels2mode(this->vi.channels);
this->convsize=MAX_NUM_SAMPLES/this->vi.channels;
if (!this->output_open) {
this->output_open = (this->stream->audio_out->open) (this->stream->audio_out,
this->stream,
16,
this->vi.rate,
mode) ;
_x_stream_info_set(this->stream, XINE_STREAM_INFO_AUDIO_BITRATE,
this->vi.bitrate_nominal);
}
/* OK, got and parsed all three headers. Initialize the Vorbis
* packet->PCM decoder. */
lprintf("all three headers parsed. initializing decoder.\n");
/* initialize central decode state */
vorbis_synthesis_init(&this->vd,&this->vi);
/* initialize local state for most of the decode so multiple
* block decodes can proceed in parallel. We could init
* multiple vorbis_block structures for vd here */
vorbis_block_init(&this->vd,&this->vb);
}
}
} else if (this->output_open) {
float **pcm;
int samples;
if(vorbis_synthesis(&this->vb,&this->op)==0)
vorbis_synthesis_blockin(&this->vd,&this->vb);
if (buf->pts!=0)
this->pts=buf->pts;
while ((samples=vorbis_synthesis_pcmout(&this->vd,&pcm))>0){
/* **pcm is a multichannel float vector. In stereo, for
* example, pcm[0][...] is left, and pcm[1][...] is right.
* samples is the size of each channel. Convert the float
* values (-1.<=range<=1.) to whatever PCM format and write
* it out
*/
int i,j;
int bout=(samples<this->convsize?samples:this->convsize);
audio_buffer_t *audio_buffer;
audio_buffer = this->stream->audio_out->get_buffer (this->stream->audio_out);
/* convert floats to 16 bit signed ints (host order) and
interleave */
for(i=0;i<this->vi.channels;i++){
ogg_int16_t *ptr=audio_buffer->mem+i;
float *mono=pcm[i];
for(j=0;j<bout;j++){
int val=(mono[j] + 1.0f) * 32768.f;
val -= 32768;
/* might as well guard against clipping */
if(val>32767){
val=32767;
} else if(val<-32768){
val=-32768;
}
*ptr=val;
ptr+=this->vi.channels;
}
}
audio_buffer->vpts = this->pts;
this->pts=0;
audio_buffer->num_frames = bout;
this->stream->audio_out->put_buffer (this->stream->audio_out, audio_buffer, this->stream);
buf->pts=0;
/* tell libvorbis how many samples we actually consumed */
vorbis_synthesis_read(&this->vd,bout);
}
} else {
lprintf("output not open\n");
}
}
static void vorbis_dispose (audio_decoder_t *this_gen) {
vorbis_decoder_t *this = (vorbis_decoder_t *) this_gen;
if( !this->header_count ) {
lprintf("deinitializing decoder\n");
vorbis_block_clear(&this->vb);
vorbis_dsp_clear(&this->vd);
}
vorbis_comment_clear(&this->vc);
vorbis_info_clear(&this->vi); /* must be called last */
if (this->output_open)
this->stream->audio_out->close (this->stream->audio_out, this->stream);
lprintf("libvorbis instance destroyed\n");
free (this_gen);
}
static audio_decoder_t *open_plugin (audio_decoder_class_t *class_gen,
xine_stream_t *stream) {
vorbis_decoder_t *this ;
this = (vorbis_decoder_t *) xine_xmalloc (sizeof (vorbis_decoder_t));
this->audio_decoder.decode_data = vorbis_decode_data;
this->audio_decoder.reset = vorbis_reset;
this->audio_decoder.discontinuity = vorbis_discontinuity;
this->audio_decoder.dispose = vorbis_dispose;
this->stream = stream;
this->output_open = 0;
this->header_count = 3;
this->convsize = 0;
vorbis_info_init(&this->vi);
vorbis_comment_init(&this->vc);
lprintf("libvorbis decoder instance created\n");
return (audio_decoder_t *) this;
}
/*
* vorbis plugin class
*/
static char *get_identifier (audio_decoder_class_t *this) {
return "vorbis";
}
static char *get_description (audio_decoder_class_t *this) {
return "vorbis audio decoder plugin";
}
static void dispose_class (audio_decoder_class_t *this) {
free (this);
}
static void *init_plugin (xine_t *xine, void *data) {
vorbis_class_t *this;
this = (vorbis_class_t *) xine_xmalloc (sizeof (vorbis_class_t));
this->decoder_class.open_plugin = open_plugin;
this->decoder_class.get_identifier = get_identifier;
this->decoder_class.get_description = get_description;
this->decoder_class.dispose = dispose_class;
return this;
}
static uint32_t audio_types[] = {
BUF_AUDIO_VORBIS, 0
};
static const decoder_info_t dec_info_audio = {
audio_types, /* supported types */
5 /* priority */
};
const plugin_info_t xine_plugin_info[] EXPORTED = {
/* type, API, "name", version, special_info, init_function */
{ PLUGIN_AUDIO_DECODER, 15, "vorbis", XINE_VERSION_CODE, &dec_info_audio, init_plugin },
{ PLUGIN_NONE, 0, "", 0, NULL, NULL }
};

Get latest updates about Open Source Projects, Conferences and News.

Sign up for the SourceForge newsletter:

JavaScript is required for this form.





No, thanks