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1
/**
2
 * @file libavcodec/vorbis_dec.c
3
 * Vorbis I decoder
4
 * @author Denes Balatoni  ( dbalatoni programozo hu )
5

6
 * This file is part of FFmpeg.
7
 *
8
 * FFmpeg is free software; you can redistribute it and/or
9
 * modify it under the terms of the GNU Lesser General Public
10
 * License as published by the Free Software Foundation; either
11
 * version 2.1 of the License, or (at your option) any later version.
12
 *
13
 * FFmpeg is distributed in the hope that it will be useful,
14
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
17
 *
18
 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
22

    
23
#undef V_DEBUG
24
//#define V_DEBUG
25
//#define AV_DEBUG(...) av_log(NULL, AV_LOG_INFO, __VA_ARGS__)
26

    
27
#include <math.h>
28

    
29
#define ALT_BITSTREAM_READER_LE
30
#include "avcodec.h"
31
#include "get_bits.h"
32
#include "dsputil.h"
33

    
34
#include "vorbis.h"
35
#include "xiph.h"
36

    
37
#define V_NB_BITS 8
38
#define V_NB_BITS2 11
39
#define V_MAX_VLCS (1<<16)
40

    
41
#ifndef V_DEBUG
42
#define AV_DEBUG(...)
43
#endif
44

    
45
#undef NDEBUG
46
#include <assert.h>
47

    
48
typedef struct {
49
    uint_fast8_t dimensions;
50
    uint_fast8_t lookup_type;
51
    uint_fast8_t maxdepth;
52
    VLC vlc;
53
    float *codevectors;
54
    unsigned int nb_bits;
55
} vorbis_codebook;
56

    
57
typedef union vorbis_floor_u vorbis_floor_data;
58
typedef struct vorbis_floor0_s vorbis_floor0;
59
typedef struct vorbis_floor1_s vorbis_floor1;
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struct vorbis_context_s;
61
typedef
62
uint_fast8_t (* vorbis_floor_decode_func)
63
             (struct vorbis_context_s *, vorbis_floor_data *, float *);
64
typedef struct {
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    uint_fast8_t floor_type;
66
    vorbis_floor_decode_func decode;
67
    union vorbis_floor_u
68
    {
69
        struct vorbis_floor0_s
70
        {
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            uint_fast8_t order;
72
            uint_fast16_t rate;
73
            uint_fast16_t bark_map_size;
74
            int_fast32_t * map[2];
75
            uint_fast32_t map_size[2];
76
            uint_fast8_t amplitude_bits;
77
            uint_fast8_t amplitude_offset;
78
            uint_fast8_t num_books;
79
            uint_fast8_t * book_list;
80
            float * lsp;
81
        } t0;
82
        struct vorbis_floor1_s
83
        {
84
            uint_fast8_t partitions;
85
            uint_fast8_t maximum_class;
86
            uint_fast8_t partition_class[32];
87
            uint_fast8_t class_dimensions[16];
88
            uint_fast8_t class_subclasses[16];
89
            uint_fast8_t class_masterbook[16];
90
            int_fast16_t subclass_books[16][8];
91
            uint_fast8_t multiplier;
92
            uint_fast16_t x_list_dim;
93
            vorbis_floor1_entry * list;
94
        } t1;
95
    } data;
96
} vorbis_floor;
97

    
98
typedef struct {
99
    uint_fast16_t type;
100
    uint_fast32_t begin;
101
    uint_fast32_t end;
102
    uint_fast32_t partition_size;
103
    uint_fast8_t classifications;
104
    uint_fast8_t classbook;
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    int_fast16_t books[64][8];
106
    uint_fast8_t maxpass;
107
} vorbis_residue;
108

    
109
typedef struct {
110
    uint_fast8_t submaps;
111
    uint_fast16_t coupling_steps;
112
    uint_fast8_t *magnitude;
113
    uint_fast8_t *angle;
114
    uint_fast8_t *mux;
115
    uint_fast8_t submap_floor[16];
116
    uint_fast8_t submap_residue[16];
117
} vorbis_mapping;
118

    
119
typedef struct {
120
    uint_fast8_t blockflag;
121
    uint_fast16_t windowtype;
122
    uint_fast16_t transformtype;
123
    uint_fast8_t mapping;
124
} vorbis_mode;
125

    
126
typedef struct vorbis_context_s {
127
    AVCodecContext *avccontext;
128
    GetBitContext gb;
129
    DSPContext dsp;
130

    
131
    FFTContext mdct[2];
132
    uint_fast8_t first_frame;
133
    uint_fast32_t version;
134
    uint_fast8_t audio_channels;
135
    uint_fast32_t audio_samplerate;
136
    uint_fast32_t bitrate_maximum;
137
    uint_fast32_t bitrate_nominal;
138
    uint_fast32_t bitrate_minimum;
139
    uint_fast32_t blocksize[2];
140
    const float * win[2];
141
    uint_fast16_t codebook_count;
142
    vorbis_codebook *codebooks;
143
    uint_fast8_t floor_count;
144
    vorbis_floor *floors;
145
    uint_fast8_t residue_count;
146
    vorbis_residue *residues;
147
    uint_fast8_t mapping_count;
148
    vorbis_mapping *mappings;
149
    uint_fast8_t mode_count;
150
    vorbis_mode *modes;
151
    uint_fast8_t mode_number; // mode number for the current packet
152
    uint_fast8_t previous_window;
153
    float *channel_residues;
154
    float *channel_floors;
155
    float *saved;
156
    uint_fast32_t add_bias; // for float->int conversion
157
    uint_fast32_t exp_bias;
158
} vorbis_context;
159

    
160
/* Helper functions */
161

    
162
#define BARK(x) \
163
    (13.1f*atan(0.00074f*(x))+2.24f*atan(1.85e-8f*(x)*(x))+1e-4f*(x))
164

    
165
static float vorbisfloat2float(uint_fast32_t val) {
166
    double mant=val&0x1fffff;
167
    long exp=(val&0x7fe00000L)>>21;
168
    if (val&0x80000000) mant=-mant;
169
    return ldexp(mant, exp - 20 - 768);
170
}
171

    
172

    
173
// Free all allocated memory -----------------------------------------
174

    
175
static void vorbis_free(vorbis_context *vc) {
176
    int_fast16_t i;
177

    
178
    av_freep(&vc->channel_residues);
179
    av_freep(&vc->channel_floors);
180
    av_freep(&vc->saved);
181

    
182
    av_freep(&vc->residues);
183
    av_freep(&vc->modes);
184

    
185
    ff_mdct_end(&vc->mdct[0]);
186
    ff_mdct_end(&vc->mdct[1]);
187

    
188
    for(i=0;i<vc->codebook_count;++i) {
189
        av_free(vc->codebooks[i].codevectors);
190
        free_vlc(&vc->codebooks[i].vlc);
191
    }
192
    av_freep(&vc->codebooks);
193

    
194
    for(i=0;i<vc->floor_count;++i) {
195
        if(vc->floors[i].floor_type==0) {
196
            av_free(vc->floors[i].data.t0.map[0]);
197
            av_free(vc->floors[i].data.t0.map[1]);
198
            av_free(vc->floors[i].data.t0.book_list);
199
            av_free(vc->floors[i].data.t0.lsp);
200
        }
201
        else {
202
            av_free(vc->floors[i].data.t1.list);
203
        }
204
    }
205
    av_freep(&vc->floors);
206

    
207
    for(i=0;i<vc->mapping_count;++i) {
208
        av_free(vc->mappings[i].magnitude);
209
        av_free(vc->mappings[i].angle);
210
        av_free(vc->mappings[i].mux);
211
    }
212
    av_freep(&vc->mappings);
213
}
214

    
215
// Parse setup header -------------------------------------------------
216

    
217
// Process codebooks part
218

    
219
static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc) {
220
    uint_fast16_t cb;
221
    uint8_t *tmp_vlc_bits;
222
    uint32_t *tmp_vlc_codes;
223
    GetBitContext *gb=&vc->gb;
224

    
225
    vc->codebook_count=get_bits(gb,8)+1;
226

    
227
    AV_DEBUG(" Codebooks: %d \n", vc->codebook_count);
228

    
229
    vc->codebooks=av_mallocz(vc->codebook_count * sizeof(vorbis_codebook));
230
    tmp_vlc_bits =av_mallocz(V_MAX_VLCS * sizeof(uint8_t));
231
    tmp_vlc_codes=av_mallocz(V_MAX_VLCS * sizeof(uint32_t));
232

    
233
    for(cb=0;cb<vc->codebook_count;++cb) {
234
        vorbis_codebook *codebook_setup=&vc->codebooks[cb];
235
        uint_fast8_t ordered;
236
        uint_fast32_t t, used_entries=0;
237
        uint_fast32_t entries;
238

    
239
        AV_DEBUG(" %d. Codebook \n", cb);
240

    
241
        if (get_bits(gb, 24)!=0x564342) {
242
            av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook setup data corrupt. \n", cb);
243
            goto error;
244
        }
245

    
246
        codebook_setup->dimensions=get_bits(gb, 16);
247
        if (codebook_setup->dimensions>16) {
248
            av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook's dimension is too large (%d). \n", cb, codebook_setup->dimensions);
249
            goto error;
250
        }
251
        entries=get_bits(gb, 24);
252
        if (entries>V_MAX_VLCS) {
253
            av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook has too many entries (%"PRIdFAST32"). \n", cb, entries);
254
            goto error;
255
        }
256

    
257
        ordered=get_bits1(gb);
258

    
259
        AV_DEBUG(" codebook_dimensions %d, codebook_entries %d \n", codebook_setup->dimensions, entries);
260

    
261
        if (!ordered) {
262
            uint_fast16_t ce;
263
            uint_fast8_t flag;
264
            uint_fast8_t sparse=get_bits1(gb);
265

    
266
            AV_DEBUG(" not ordered \n");
267

    
268
            if (sparse) {
269
                AV_DEBUG(" sparse \n");
270

    
271
                used_entries=0;
272
                for(ce=0;ce<entries;++ce) {
273
                    flag=get_bits1(gb);
274
                    if (flag) {
275
                        tmp_vlc_bits[ce]=get_bits(gb, 5)+1;
276
                        ++used_entries;
277
                    }
278
                    else tmp_vlc_bits[ce]=0;
279
                }
280
            } else {
281
                AV_DEBUG(" not sparse \n");
282

    
283
                used_entries=entries;
284
                for(ce=0;ce<entries;++ce) {
285
                    tmp_vlc_bits[ce]=get_bits(gb, 5)+1;
286
                }
287
            }
288
        } else {
289
            uint_fast16_t current_entry=0;
290
            uint_fast8_t current_length=get_bits(gb, 5)+1;
291

    
292
            AV_DEBUG(" ordered, current length: %d \n", current_length);  //FIXME
293

    
294
            used_entries=entries;
295
            for(;current_entry<used_entries && current_length <= 32;++current_length) {
296
                uint_fast16_t i, number;
297

    
298
                AV_DEBUG(" number bits: %d ", ilog(entries - current_entry));
299

    
300
                number=get_bits(gb, ilog(entries - current_entry));
301

    
302
                AV_DEBUG(" number: %d \n", number);
303

    
304
                for(i=current_entry;i<number+current_entry;++i) {
305
                    if (i<used_entries) tmp_vlc_bits[i]=current_length;
306
                }
307

    
308
                current_entry+=number;
309
            }
310
            if (current_entry>used_entries) {
311
                av_log(vc->avccontext, AV_LOG_ERROR, " More codelengths than codes in codebook. \n");
312
                goto error;
313
            }
314
        }
315

    
316
        codebook_setup->lookup_type=get_bits(gb, 4);
317

    
318
        AV_DEBUG(" lookup type: %d : %s \n", codebook_setup->lookup_type, codebook_setup->lookup_type ? "vq" : "no lookup" );
319

    
320
// If the codebook is used for (inverse) VQ, calculate codevectors.
321

    
322
        if (codebook_setup->lookup_type==1) {
323
            uint_fast16_t i, j, k;
324
            uint_fast16_t codebook_lookup_values=ff_vorbis_nth_root(entries, codebook_setup->dimensions);
325
            uint_fast16_t codebook_multiplicands[codebook_lookup_values];
326

    
327
            float codebook_minimum_value=vorbisfloat2float(get_bits_long(gb, 32));
328
            float codebook_delta_value=vorbisfloat2float(get_bits_long(gb, 32));
329
            uint_fast8_t codebook_value_bits=get_bits(gb, 4)+1;
330
            uint_fast8_t codebook_sequence_p=get_bits1(gb);
331

    
332
            AV_DEBUG(" We expect %d numbers for building the codevectors. \n", codebook_lookup_values);
333
            AV_DEBUG("  delta %f minmum %f \n", codebook_delta_value, codebook_minimum_value);
334

    
335
            for(i=0;i<codebook_lookup_values;++i) {
336
                codebook_multiplicands[i]=get_bits(gb, codebook_value_bits);
337

    
338
                AV_DEBUG(" multiplicands*delta+minmum : %e \n", (float)codebook_multiplicands[i]*codebook_delta_value+codebook_minimum_value);
339
                AV_DEBUG(" multiplicand %d \n", codebook_multiplicands[i]);
340
            }
341

    
342
// Weed out unused vlcs and build codevector vector
343
            codebook_setup->codevectors=used_entries ? av_mallocz(used_entries*codebook_setup->dimensions * sizeof(float)) : NULL;
344
            for(j=0, i=0;i<entries;++i) {
345
                uint_fast8_t dim=codebook_setup->dimensions;
346

    
347
                if (tmp_vlc_bits[i]) {
348
                    float last=0.0;
349
                    uint_fast32_t lookup_offset=i;
350

    
351
#ifdef V_DEBUG
352
                    av_log(vc->avccontext, AV_LOG_INFO, "Lookup offset %d ,", i);
353
#endif
354

    
355
                    for(k=0;k<dim;++k) {
356
                        uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values;
357
                        codebook_setup->codevectors[j*dim+k]=codebook_multiplicands[multiplicand_offset]*codebook_delta_value+codebook_minimum_value+last;
358
                        if (codebook_sequence_p) {
359
                            last=codebook_setup->codevectors[j*dim+k];
360
                        }
361
                        lookup_offset/=codebook_lookup_values;
362
                    }
363
                    tmp_vlc_bits[j]=tmp_vlc_bits[i];
364

    
365
#ifdef V_DEBUG
366
                    av_log(vc->avccontext, AV_LOG_INFO, "real lookup offset %d, vector: ", j);
367
                    for(k=0;k<dim;++k) {
368
                        av_log(vc->avccontext, AV_LOG_INFO, " %f ", codebook_setup->codevectors[j*dim+k]);
369
                    }
370
                    av_log(vc->avccontext, AV_LOG_INFO, "\n");
371
#endif
372

    
373
                    ++j;
374
                }
375
            }
376
            if (j!=used_entries) {
377
                av_log(vc->avccontext, AV_LOG_ERROR, "Bug in codevector vector building code. \n");
378
                goto error;
379
            }
380
            entries=used_entries;
381
        }
382
        else if (codebook_setup->lookup_type>=2) {
383
            av_log(vc->avccontext, AV_LOG_ERROR, "Codebook lookup type not supported. \n");
384
            goto error;
385
        }
386

    
387
// Initialize VLC table
388
        if (ff_vorbis_len2vlc(tmp_vlc_bits, tmp_vlc_codes, entries)) {
389
            av_log(vc->avccontext, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");
390
            goto error;
391
        }
392
        codebook_setup->maxdepth=0;
393
        for(t=0;t<entries;++t)
394
            if (tmp_vlc_bits[t]>=codebook_setup->maxdepth) codebook_setup->maxdepth=tmp_vlc_bits[t];
395

    
396
        if(codebook_setup->maxdepth > 3*V_NB_BITS) codebook_setup->nb_bits=V_NB_BITS2;
397
        else                                       codebook_setup->nb_bits=V_NB_BITS;
398

    
399
        codebook_setup->maxdepth=(codebook_setup->maxdepth+codebook_setup->nb_bits-1)/codebook_setup->nb_bits;
400

    
401
        if (init_vlc(&codebook_setup->vlc, codebook_setup->nb_bits, entries, tmp_vlc_bits, sizeof(*tmp_vlc_bits), sizeof(*tmp_vlc_bits), tmp_vlc_codes, sizeof(*tmp_vlc_codes), sizeof(*tmp_vlc_codes), INIT_VLC_LE)) {
402
            av_log(vc->avccontext, AV_LOG_ERROR, " Error generating vlc tables. \n");
403
            goto error;
404
        }
405
    }
406

    
407
    av_free(tmp_vlc_bits);
408
    av_free(tmp_vlc_codes);
409
    return 0;
410

    
411
// Error:
412
error:
413
    av_free(tmp_vlc_bits);
414
    av_free(tmp_vlc_codes);
415
    return 1;
416
}
417

    
418
// Process time domain transforms part (unused in Vorbis I)
419

    
420
static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc) {
421
    GetBitContext *gb=&vc->gb;
422
    uint_fast8_t i;
423
    uint_fast8_t vorbis_time_count=get_bits(gb, 6)+1;
424

    
425
    for(i=0;i<vorbis_time_count;++i) {
426
        uint_fast16_t vorbis_tdtransform=get_bits(gb, 16);
427

    
428
        AV_DEBUG(" Vorbis time domain transform %d: %d \n", vorbis_time_count, vorbis_tdtransform);
429

    
430
        if (vorbis_tdtransform) {
431
            av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n");
432
            return 1;
433
        }
434
    }
435
    return 0;
436
}
437

    
438
// Process floors part
439

    
440
static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,
441
                                         vorbis_floor_data *vfu, float *vec);
442
static void create_map( vorbis_context * vc, uint_fast8_t floor_number );
443
static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc,
444
                                         vorbis_floor_data *vfu, float *vec);
445
static int vorbis_parse_setup_hdr_floors(vorbis_context *vc) {
446
    GetBitContext *gb=&vc->gb;
447
    uint_fast16_t i,j,k;
448

    
449
    vc->floor_count=get_bits(gb, 6)+1;
450

    
451
    vc->floors=av_mallocz(vc->floor_count * sizeof(vorbis_floor));
452

    
453
    for (i=0;i<vc->floor_count;++i) {
454
        vorbis_floor *floor_setup=&vc->floors[i];
455

    
456
        floor_setup->floor_type=get_bits(gb, 16);
457

    
458
        AV_DEBUG(" %d. floor type %d \n", i, floor_setup->floor_type);
459

    
460
        if (floor_setup->floor_type==1) {
461
            uint_fast8_t maximum_class=0;
462
            uint_fast8_t rangebits;
463
            uint_fast16_t floor1_values=2;
464

    
465
            floor_setup->decode=vorbis_floor1_decode;
466

    
467
            floor_setup->data.t1.partitions=get_bits(gb, 5);
468

    
469
            AV_DEBUG(" %d.floor: %d partitions \n", i, floor_setup->data.t1.partitions);
470

    
471
            for(j=0;j<floor_setup->data.t1.partitions;++j) {
472
                floor_setup->data.t1.partition_class[j]=get_bits(gb, 4);
473
                if (floor_setup->data.t1.partition_class[j]>maximum_class) maximum_class=floor_setup->data.t1.partition_class[j];
474

    
475
                AV_DEBUG(" %d. floor %d partition class %d \n", i, j, floor_setup->data.t1.partition_class[j]);
476

    
477
            }
478

    
479
            AV_DEBUG(" maximum class %d \n", maximum_class);
480

    
481
            floor_setup->data.t1.maximum_class=maximum_class;
482

    
483
            for(j=0;j<=maximum_class;++j) {
484
                floor_setup->data.t1.class_dimensions[j]=get_bits(gb, 3)+1;
485
                floor_setup->data.t1.class_subclasses[j]=get_bits(gb, 2);
486

    
487
                AV_DEBUG(" %d floor %d class dim: %d subclasses %d \n", i, j, floor_setup->data.t1.class_dimensions[j], floor_setup->data.t1.class_subclasses[j]);
488

    
489
                if (floor_setup->data.t1.class_subclasses[j]) {
490
                    floor_setup->data.t1.class_masterbook[j]=get_bits(gb, 8);
491

    
492
                    AV_DEBUG("   masterbook: %d \n", floor_setup->data.t1.class_masterbook[j]);
493
                }
494

    
495
                for(k=0;k<(1<<floor_setup->data.t1.class_subclasses[j]);++k) {
496
                    floor_setup->data.t1.subclass_books[j][k]=(int16_t)get_bits(gb, 8)-1;
497

    
498
                    AV_DEBUG("    book %d. : %d \n", k, floor_setup->data.t1.subclass_books[j][k]);
499
                }
500
            }
501

    
502
            floor_setup->data.t1.multiplier=get_bits(gb, 2)+1;
503
            floor_setup->data.t1.x_list_dim=2;
504

    
505
            for(j=0;j<floor_setup->data.t1.partitions;++j) {
506
                floor_setup->data.t1.x_list_dim+=floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];
507
            }
508

    
509
            floor_setup->data.t1.list=av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(vorbis_floor1_entry));
510

    
511

    
512
            rangebits=get_bits(gb, 4);
513
            floor_setup->data.t1.list[0].x = 0;
514
            floor_setup->data.t1.list[1].x = (1<<rangebits);
515

    
516
            for(j=0;j<floor_setup->data.t1.partitions;++j) {
517
                for(k=0;k<floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];++k,++floor1_values) {
518
                    floor_setup->data.t1.list[floor1_values].x=get_bits(gb, rangebits);
519

    
520
                    AV_DEBUG(" %d. floor1 Y coord. %d \n", floor1_values, floor_setup->data.t1.list[floor1_values].x);
521
                }
522
            }
523

    
524
// Precalculate order of x coordinates - needed for decode
525
            ff_vorbis_ready_floor1_list(floor_setup->data.t1.list, floor_setup->data.t1.x_list_dim);
526
        }
527
        else if(floor_setup->floor_type==0) {
528
            uint_fast8_t max_codebook_dim=0;
529

    
530
            floor_setup->decode=vorbis_floor0_decode;
531

    
532
            floor_setup->data.t0.order=get_bits(gb, 8);
533
            floor_setup->data.t0.rate=get_bits(gb, 16);
534
            floor_setup->data.t0.bark_map_size=get_bits(gb, 16);
535
            floor_setup->data.t0.amplitude_bits=get_bits(gb, 6);
536
            /* zero would result in a div by zero later *
537
             * 2^0 - 1 == 0                             */
538
            if (floor_setup->data.t0.amplitude_bits == 0) {
539
              av_log(vc->avccontext, AV_LOG_ERROR,
540
                     "Floor 0 amplitude bits is 0.\n");
541
              return 1;
542
            }
543
            floor_setup->data.t0.amplitude_offset=get_bits(gb, 8);
544
            floor_setup->data.t0.num_books=get_bits(gb, 4)+1;
545

    
546
            /* allocate mem for booklist */
547
            floor_setup->data.t0.book_list=
548
                av_malloc(floor_setup->data.t0.num_books);
549
            if(!floor_setup->data.t0.book_list) { return 1; }
550
            /* read book indexes */
551
            {
552
                int idx;
553
                uint_fast8_t book_idx;
554
                for (idx=0;idx<floor_setup->data.t0.num_books;++idx) {
555
                    book_idx=get_bits(gb, 8);
556
                    floor_setup->data.t0.book_list[idx]=book_idx;
557
                    if (vc->codebooks[book_idx].dimensions > max_codebook_dim)
558
                        max_codebook_dim=vc->codebooks[book_idx].dimensions;
559

    
560
                    if (floor_setup->data.t0.book_list[idx]>vc->codebook_count)
561
                        return 1;
562
                }
563
            }
564

    
565
            create_map( vc, i );
566

    
567
            /* allocate mem for lsp coefficients */
568
            {
569
                /* codebook dim is for padding if codebook dim doesn't *
570
                 * divide order+1 then we need to read more data       */
571
                floor_setup->data.t0.lsp=
572
                    av_malloc((floor_setup->data.t0.order+1 + max_codebook_dim)
573
                              * sizeof(float));
574
                if(!floor_setup->data.t0.lsp) { return 1; }
575
            }
576

    
577
#ifdef V_DEBUG /* debug output parsed headers */
578
            AV_DEBUG("floor0 order: %u\n", floor_setup->data.t0.order);
579
            AV_DEBUG("floor0 rate: %u\n", floor_setup->data.t0.rate);
580
            AV_DEBUG("floor0 bark map size: %u\n",
581
              floor_setup->data.t0.bark_map_size);
582
            AV_DEBUG("floor0 amplitude bits: %u\n",
583
              floor_setup->data.t0.amplitude_bits);
584
            AV_DEBUG("floor0 amplitude offset: %u\n",
585
              floor_setup->data.t0.amplitude_offset);
586
            AV_DEBUG("floor0 number of books: %u\n",
587
              floor_setup->data.t0.num_books);
588
            AV_DEBUG("floor0 book list pointer: %p\n",
589
              floor_setup->data.t0.book_list);
590
            {
591
              int idx;
592
              for (idx=0;idx<floor_setup->data.t0.num_books;++idx) {
593
                AV_DEBUG( "  Book %d: %u\n",
594
                  idx+1,
595
                  floor_setup->data.t0.book_list[idx] );
596
              }
597
            }
598
#endif
599
        }
600
        else {
601
            av_log(vc->avccontext, AV_LOG_ERROR, "Invalid floor type!\n");
602
            return 1;
603
        }
604
    }
605
    return 0;
606
}
607

    
608
// Process residues part
609

    
610
static int vorbis_parse_setup_hdr_residues(vorbis_context *vc){
611
    GetBitContext *gb=&vc->gb;
612
    uint_fast8_t i, j, k;
613

    
614
    vc->residue_count=get_bits(gb, 6)+1;
615
    vc->residues=av_mallocz(vc->residue_count * sizeof(vorbis_residue));
616

    
617
    AV_DEBUG(" There are %d residues. \n", vc->residue_count);
618

    
619
    for(i=0;i<vc->residue_count;++i) {
620
        vorbis_residue *res_setup=&vc->residues[i];
621
        uint_fast8_t cascade[64];
622
        uint_fast8_t high_bits;
623
        uint_fast8_t low_bits;
624

    
625
        res_setup->type=get_bits(gb, 16);
626

    
627
        AV_DEBUG(" %d. residue type %d \n", i, res_setup->type);
628

    
629
        res_setup->begin=get_bits(gb, 24);
630
        res_setup->end=get_bits(gb, 24);
631
        res_setup->partition_size=get_bits(gb, 24)+1;
632
        res_setup->classifications=get_bits(gb, 6)+1;
633
        res_setup->classbook=get_bits(gb, 8);
634

    
635
        AV_DEBUG("    begin %d end %d part.size %d classif.s %d classbook %d \n", res_setup->begin, res_setup->end, res_setup->partition_size,
636
          res_setup->classifications, res_setup->classbook);
637

    
638
        for(j=0;j<res_setup->classifications;++j) {
639
            high_bits=0;
640
            low_bits=get_bits(gb, 3);
641
            if (get_bits1(gb)) {
642
                high_bits=get_bits(gb, 5);
643
            }
644
            cascade[j]=(high_bits<<3)+low_bits;
645

    
646
            AV_DEBUG("     %d class casscade depth: %d \n", j, ilog(cascade[j]));
647
        }
648

    
649
        res_setup->maxpass=0;
650
        for(j=0;j<res_setup->classifications;++j) {
651
            for(k=0;k<8;++k) {
652
                if (cascade[j]&(1<<k)) {
653
                        res_setup->books[j][k]=get_bits(gb, 8);
654

    
655
                    AV_DEBUG("     %d class casscade depth %d book: %d \n", j, k, res_setup->books[j][k]);
656

    
657
                    if (k>res_setup->maxpass) {
658
                        res_setup->maxpass=k;
659
                    }
660
                } else {
661
                    res_setup->books[j][k]=-1;
662
                }
663
            }
664
        }
665
    }
666
    return 0;
667
}
668

    
669
// Process mappings part
670

    
671
static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc) {
672
    GetBitContext *gb=&vc->gb;
673
    uint_fast8_t i, j;
674

    
675
    vc->mapping_count=get_bits(gb, 6)+1;
676
    vc->mappings=av_mallocz(vc->mapping_count * sizeof(vorbis_mapping));
677

    
678
    AV_DEBUG(" There are %d mappings. \n", vc->mapping_count);
679

    
680
    for(i=0;i<vc->mapping_count;++i) {
681
        vorbis_mapping *mapping_setup=&vc->mappings[i];
682

    
683
        if (get_bits(gb, 16)) {
684
            av_log(vc->avccontext, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n");
685
            return 1;
686
        }
687
        if (get_bits1(gb)) {
688
            mapping_setup->submaps=get_bits(gb, 4)+1;
689
        } else {
690
            mapping_setup->submaps=1;
691
        }
692

    
693
        if (get_bits1(gb)) {
694
            mapping_setup->coupling_steps=get_bits(gb, 8)+1;
695
            mapping_setup->magnitude=av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
696
            mapping_setup->angle    =av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
697
            for(j=0;j<mapping_setup->coupling_steps;++j) {
698
                mapping_setup->magnitude[j]=get_bits(gb, ilog(vc->audio_channels-1));
699
                mapping_setup->angle[j]=get_bits(gb, ilog(vc->audio_channels-1));
700
                // FIXME: sanity checks
701
            }
702
        } else {
703
            mapping_setup->coupling_steps=0;
704
        }
705

    
706
        AV_DEBUG("   %d mapping coupling steps: %d \n", i, mapping_setup->coupling_steps);
707

    
708
        if(get_bits(gb, 2)) {
709
            av_log(vc->avccontext, AV_LOG_ERROR, "%d. mapping setup data invalid. \n", i);
710
            return 1; // following spec.
711
        }
712

    
713
        if (mapping_setup->submaps>1) {
714
            mapping_setup->mux=av_mallocz(vc->audio_channels * sizeof(uint_fast8_t));
715
            for(j=0;j<vc->audio_channels;++j) {
716
                mapping_setup->mux[j]=get_bits(gb, 4);
717
            }
718
        }
719

    
720
        for(j=0;j<mapping_setup->submaps;++j) {
721
            skip_bits(gb, 8); // FIXME check?
722
            mapping_setup->submap_floor[j]=get_bits(gb, 8);
723
            mapping_setup->submap_residue[j]=get_bits(gb, 8);
724

    
725
            AV_DEBUG("   %d mapping %d submap : floor %d, residue %d \n", i, j, mapping_setup->submap_floor[j], mapping_setup->submap_residue[j]);
726
        }
727
    }
728
    return 0;
729
}
730

    
731
// Process modes part
732

    
733
static void create_map( vorbis_context * vc, uint_fast8_t floor_number )
734
{
735
    vorbis_floor * floors=vc->floors;
736
    vorbis_floor0 * vf;
737
    int idx;
738
    int_fast8_t blockflag;
739
    int_fast32_t * map;
740
    int_fast32_t n; //TODO: could theoretically be smaller?
741

    
742
    for (blockflag=0;blockflag<2;++blockflag)
743
    {
744
    n=vc->blocksize[blockflag]/2;
745
    floors[floor_number].data.t0.map[blockflag]=
746
        av_malloc((n+1) * sizeof(int_fast32_t)); // n+sentinel
747

    
748
    map=floors[floor_number].data.t0.map[blockflag];
749
    vf=&floors[floor_number].data.t0;
750

    
751
    for (idx=0; idx<n;++idx) {
752
        map[idx]=floor( BARK((vf->rate*idx)/(2.0f*n)) *
753
                              ((vf->bark_map_size)/
754
                               BARK(vf->rate/2.0f )) );
755
        if (vf->bark_map_size-1 < map[idx]) {
756
            map[idx]=vf->bark_map_size-1;
757
        }
758
    }
759
    map[n]=-1;
760
    vf->map_size[blockflag]=n;
761
    }
762

    
763
#   ifdef V_DEBUG
764
    for(idx=0;idx<=n;++idx) {
765
        AV_DEBUG("floor0 map: map at pos %d is %d\n",
766
                 idx, map[idx]);
767
    }
768
#   endif
769
}
770

    
771
static int vorbis_parse_setup_hdr_modes(vorbis_context *vc) {
772
    GetBitContext *gb=&vc->gb;
773
    uint_fast8_t i;
774

    
775
    vc->mode_count=get_bits(gb, 6)+1;
776
    vc->modes=av_mallocz(vc->mode_count * sizeof(vorbis_mode));
777

    
778
    AV_DEBUG(" There are %d modes.\n", vc->mode_count);
779

    
780
    for(i=0;i<vc->mode_count;++i) {
781
        vorbis_mode *mode_setup=&vc->modes[i];
782

    
783
        mode_setup->blockflag=get_bits1(gb);
784
        mode_setup->windowtype=get_bits(gb, 16); //FIXME check
785
        mode_setup->transformtype=get_bits(gb, 16); //FIXME check
786
        mode_setup->mapping=get_bits(gb, 8); //FIXME check
787

    
788
        AV_DEBUG(" %d mode: blockflag %d, windowtype %d, transformtype %d, mapping %d \n", i, mode_setup->blockflag, mode_setup->windowtype, mode_setup->transformtype, mode_setup->mapping);
789
    }
790
    return 0;
791
}
792

    
793
// Process the whole setup header using the functions above
794

    
795
static int vorbis_parse_setup_hdr(vorbis_context *vc) {
796
    GetBitContext *gb=&vc->gb;
797

    
798
    if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') ||
799
    (get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') ||
800
    (get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) {
801
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n");
802
        return 1;
803
    }
804

    
805
    if (vorbis_parse_setup_hdr_codebooks(vc)) {
806
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n");
807
        return 2;
808
    }
809
    if (vorbis_parse_setup_hdr_tdtransforms(vc)) {
810
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n");
811
        return 3;
812
    }
813
    if (vorbis_parse_setup_hdr_floors(vc)) {
814
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n");
815
        return 4;
816
    }
817
    if (vorbis_parse_setup_hdr_residues(vc)) {
818
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n");
819
        return 5;
820
    }
821
    if (vorbis_parse_setup_hdr_mappings(vc)) {
822
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n");
823
        return 6;
824
    }
825
    if (vorbis_parse_setup_hdr_modes(vc)) {
826
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n");
827
        return 7;
828
    }
829
    if (!get_bits1(gb)) {
830
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n");
831
        return 8; // framing flag bit unset error
832
    }
833

    
834
    return 0;
835
}
836

    
837
// Process the identification header
838

    
839
static int vorbis_parse_id_hdr(vorbis_context *vc){
840
    GetBitContext *gb=&vc->gb;
841
    uint_fast8_t bl0, bl1;
842

    
843
    if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') ||
844
    (get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') ||
845
    (get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) {
846
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n");
847
        return 1;
848
    }
849

    
850
    vc->version=get_bits_long(gb, 32);    //FIXME check 0
851
    vc->audio_channels=get_bits(gb, 8);
852
    if(vc->audio_channels <= 0){
853
        av_log(vc->avccontext, AV_LOG_ERROR, "Invalid number of channels\n");
854
        return -1;
855
    }
856
    vc->audio_samplerate=get_bits_long(gb, 32);
857
    if(vc->audio_samplerate <= 0){
858
        av_log(vc->avccontext, AV_LOG_ERROR, "Invalid samplerate\n");
859
        return -1;
860
    }
861
    vc->bitrate_maximum=get_bits_long(gb, 32);
862
    vc->bitrate_nominal=get_bits_long(gb, 32);
863
    vc->bitrate_minimum=get_bits_long(gb, 32);
864
    bl0=get_bits(gb, 4);
865
    bl1=get_bits(gb, 4);
866
    vc->blocksize[0]=(1<<bl0);
867
    vc->blocksize[1]=(1<<bl1);
868
    if (bl0>13 || bl0<6 || bl1>13 || bl1<6 || bl1<bl0) {
869
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n");
870
        return 3;
871
    }
872
    // output format int16
873
    if (vc->blocksize[1]/2 * vc->audio_channels * 2 >
874
                                             AVCODEC_MAX_AUDIO_FRAME_SIZE) {
875
        av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis channel count makes "
876
               "output packets too large.\n");
877
        return 4;
878
    }
879
    vc->win[0]=ff_vorbis_vwin[bl0-6];
880
    vc->win[1]=ff_vorbis_vwin[bl1-6];
881

    
882
    if ((get_bits1(gb)) == 0) {
883
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n");
884
        return 2;
885
    }
886

    
887
    vc->channel_residues= av_malloc((vc->blocksize[1]/2)*vc->audio_channels * sizeof(float));
888
    vc->channel_floors  = av_malloc((vc->blocksize[1]/2)*vc->audio_channels * sizeof(float));
889
    vc->saved           = av_mallocz((vc->blocksize[1]/4)*vc->audio_channels * sizeof(float));
890
    vc->previous_window=0;
891

    
892
    ff_mdct_init(&vc->mdct[0], bl0, 1, vc->exp_bias ? -(1<<15) : -1.0);
893
    ff_mdct_init(&vc->mdct[1], bl1, 1, vc->exp_bias ? -(1<<15) : -1.0);
894

    
895
    AV_DEBUG(" vorbis version %d \n audio_channels %d \n audio_samplerate %d \n bitrate_max %d \n bitrate_nom %d \n bitrate_min %d \n blk_0 %d blk_1 %d \n ",
896
            vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize[0], vc->blocksize[1]);
897

    
898
/*
899
    BLK=vc->blocksize[0];
900
    for(i=0;i<BLK/2;++i) {
901
        vc->win[0][i]=sin(0.5*3.14159265358*(sin(((float)i+0.5)/(float)BLK*3.14159265358))*(sin(((float)i+0.5)/(float)BLK*3.14159265358)));
902
    }
903
*/
904

    
905
    return 0;
906
}
907

    
908
// Process the extradata using the functions above (identification header, setup header)
909

    
910
static av_cold int vorbis_decode_init(AVCodecContext *avccontext) {
911
    vorbis_context *vc = avccontext->priv_data ;
912
    uint8_t *headers = avccontext->extradata;
913
    int headers_len=avccontext->extradata_size;
914
    uint8_t *header_start[3];
915
    int header_len[3];
916
    GetBitContext *gb = &(vc->gb);
917
    int hdr_type;
918

    
919
    vc->avccontext = avccontext;
920
    dsputil_init(&vc->dsp, avccontext);
921

    
922
    if(vc->dsp.float_to_int16_interleave == ff_float_to_int16_interleave_c) {
923
        vc->add_bias = 385;
924
        vc->exp_bias = 0;
925
    } else {
926
        vc->add_bias = 0;
927
        vc->exp_bias = 15<<23;
928
    }
929

    
930
    if (!headers_len) {
931
        av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
932
        return -1;
933
    }
934

    
935
    if (ff_split_xiph_headers(headers, headers_len, 30, header_start, header_len) < 0) {
936
        av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
937
        return -1;
938
    }
939

    
940
    init_get_bits(gb, header_start[0], header_len[0]*8);
941
    hdr_type=get_bits(gb, 8);
942
    if (hdr_type!=1) {
943
        av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n");
944
        return -1;
945
    }
946
    if (vorbis_parse_id_hdr(vc)) {
947
        av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n");
948
        vorbis_free(vc);
949
        return -1;
950
    }
951

    
952
    init_get_bits(gb, header_start[2], header_len[2]*8);
953
    hdr_type=get_bits(gb, 8);
954
    if (hdr_type!=5) {
955
        av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");
956
        vorbis_free(vc);
957
        return -1;
958
    }
959
    if (vorbis_parse_setup_hdr(vc)) {
960
        av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");
961
        vorbis_free(vc);
962
        return -1;
963
    }
964

    
965
    avccontext->channels = vc->audio_channels;
966
    avccontext->sample_rate = vc->audio_samplerate;
967
    avccontext->frame_size  = FFMIN(vc->blocksize[0], vc->blocksize[1])>>2;
968
    avccontext->sample_fmt = SAMPLE_FMT_S16;
969

    
970
    return 0 ;
971
}
972

    
973
// Decode audiopackets -------------------------------------------------
974

    
975
// Read and decode floor
976

    
977
static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,
978
                                         vorbis_floor_data *vfu, float *vec) {
979
    vorbis_floor0 * vf=&vfu->t0;
980
    float * lsp=vf->lsp;
981
    uint_fast32_t amplitude;
982
    uint_fast32_t book_idx;
983
    uint_fast8_t blockflag=vc->modes[vc->mode_number].blockflag;
984

    
985
    amplitude=get_bits(&vc->gb, vf->amplitude_bits);
986
    if (amplitude>0) {
987
        float last = 0;
988
        uint_fast16_t lsp_len = 0;
989
        uint_fast16_t idx;
990
        vorbis_codebook codebook;
991

    
992
        book_idx=get_bits(&vc->gb, ilog(vf->num_books));
993
        if ( book_idx >= vf->num_books ) {
994
            av_log( vc->avccontext, AV_LOG_ERROR,
995
                    "floor0 dec: booknumber too high!\n" );
996
            book_idx= 0;
997
            //FIXME: look above
998
        }
999
        AV_DEBUG( "floor0 dec: booknumber: %u\n", book_idx );
1000
        codebook=vc->codebooks[vf->book_list[book_idx]];
1001

    
1002
        while (lsp_len<vf->order) {
1003
            int vec_off;
1004

    
1005
            AV_DEBUG( "floor0 dec: book dimension: %d\n", codebook.dimensions );
1006
            AV_DEBUG( "floor0 dec: maximum depth: %d\n", codebook.maxdepth );
1007
            /* read temp vector */
1008
            vec_off=get_vlc2(&vc->gb,
1009
                             codebook.vlc.table,
1010
                             codebook.nb_bits,
1011
                             codebook.maxdepth ) *
1012
                             codebook.dimensions;
1013
            AV_DEBUG( "floor0 dec: vector offset: %d\n", vec_off );
1014
            /* copy each vector component and add last to it */
1015
            for (idx=0; idx<codebook.dimensions; ++idx) {
1016
                lsp[lsp_len+idx]=codebook.codevectors[vec_off+idx]+last;
1017
            }
1018
            last=lsp[lsp_len+idx-1]; /* set last to last vector component */
1019

    
1020
            lsp_len += codebook.dimensions;
1021
        }
1022
#ifdef V_DEBUG
1023
        /* DEBUG: output lsp coeffs */
1024
        {
1025
            int idx;
1026
            for ( idx = 0; idx < lsp_len; ++idx )
1027
                AV_DEBUG("floor0 dec: coeff at %d is %f\n", idx, lsp[idx] );
1028
        }
1029
#endif
1030

    
1031
        /* synthesize floor output vector */
1032
        {
1033
            int i;
1034
            int order=vf->order;
1035
            float wstep=M_PI/vf->bark_map_size;
1036

    
1037
            for(i=0;i<order;i++) { lsp[i]=2.0f*cos(lsp[i]); }
1038

    
1039
            AV_DEBUG("floor0 synth: map_size=%d; m=%d; wstep=%f\n",
1040
                     vf->map_size, order, wstep);
1041

    
1042
            i=0;
1043
            while(i<vf->map_size[blockflag]) {
1044
                int j, iter_cond=vf->map[blockflag][i];
1045
                float p=0.5f;
1046
                float q=0.5f;
1047
                float two_cos_w=2.0f*cos(wstep*iter_cond); // needed all times
1048

    
1049
                /* similar part for the q and p products */
1050
                for(j=0;j+1<order;j+=2) {
1051
                    q *= lsp[j]  -two_cos_w;
1052
                    p *= lsp[j+1]-two_cos_w;
1053
                }
1054
                if(j==order) { // even order
1055
                    p *= p*(2.0f-two_cos_w);
1056
                    q *= q*(2.0f+two_cos_w);
1057
                }
1058
                else { // odd order
1059
                    q *= two_cos_w-lsp[j]; // one more time for q
1060

    
1061
                    /* final step and square */
1062
                    p *= p*(4.f-two_cos_w*two_cos_w);
1063
                    q *= q;
1064
                }
1065

    
1066
                /* calculate linear floor value */
1067
                {
1068
                    q=exp( (
1069
                             ( (amplitude*vf->amplitude_offset)/
1070
                               (((1<<vf->amplitude_bits)-1) * sqrt(p+q)) )
1071
                             - vf->amplitude_offset ) * .11512925f
1072
                         );
1073
                }
1074

    
1075
                /* fill vector */
1076
                do { vec[i]=q; ++i; }while(vf->map[blockflag][i]==iter_cond);
1077
            }
1078
        }
1079
    }
1080
    else {
1081
        /* this channel is unused */
1082
        return 1;
1083
    }
1084

    
1085
    AV_DEBUG(" Floor0 decoded\n");
1086

    
1087
    return 0;
1088
}
1089

    
1090
static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc, vorbis_floor_data *vfu, float *vec) {
1091
    vorbis_floor1 * vf=&vfu->t1;
1092
    GetBitContext *gb=&vc->gb;
1093
    uint_fast16_t range_v[4]={ 256, 128, 86, 64 };
1094
    uint_fast16_t range=range_v[vf->multiplier-1];
1095
    uint_fast16_t floor1_Y[vf->x_list_dim];
1096
    uint_fast16_t floor1_Y_final[vf->x_list_dim];
1097
    int floor1_flag[vf->x_list_dim];
1098
    uint_fast8_t class_;
1099
    uint_fast8_t cdim;
1100
    uint_fast8_t cbits;
1101
    uint_fast8_t csub;
1102
    uint_fast8_t cval;
1103
    int_fast16_t book;
1104
    uint_fast16_t offset;
1105
    uint_fast16_t i,j;
1106
    /*u*/int_fast16_t adx, ady, off, predicted; // WTF ? dy/adx= (unsigned)dy/adx ?
1107
    int_fast16_t dy, err;
1108

    
1109

    
1110
    if (!get_bits1(gb)) return 1; // silence
1111

    
1112
// Read values (or differences) for the floor's points
1113

    
1114
    floor1_Y[0]=get_bits(gb, ilog(range-1));
1115
    floor1_Y[1]=get_bits(gb, ilog(range-1));
1116

    
1117
    AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);
1118

    
1119
    offset=2;
1120
    for(i=0;i<vf->partitions;++i) {
1121
        class_=vf->partition_class[i];
1122
        cdim=vf->class_dimensions[class_];
1123
        cbits=vf->class_subclasses[class_];
1124
        csub=(1<<cbits)-1;
1125
        cval=0;
1126

    
1127
        AV_DEBUG("Cbits %d \n", cbits);
1128

    
1129
        if (cbits) { // this reads all subclasses for this partition's class
1130
            cval=get_vlc2(gb, vc->codebooks[vf->class_masterbook[class_]].vlc.table,
1131
            vc->codebooks[vf->class_masterbook[class_]].nb_bits, 3);
1132
        }
1133

    
1134
        for(j=0;j<cdim;++j) {
1135
            book=vf->subclass_books[class_][cval & csub];
1136

    
1137
            AV_DEBUG("book %d Cbits %d cval %d  bits:%d \n", book, cbits, cval, get_bits_count(gb));
1138

    
1139
            cval=cval>>cbits;
1140
            if (book>-1) {
1141
                floor1_Y[offset+j]=get_vlc2(gb, vc->codebooks[book].vlc.table,
1142
                vc->codebooks[book].nb_bits, 3);
1143
            } else {
1144
                floor1_Y[offset+j]=0;
1145
            }
1146

    
1147
            AV_DEBUG(" floor(%d) = %d \n", vf->list[offset+j].x, floor1_Y[offset+j]);
1148
        }
1149
        offset+=cdim;
1150
    }
1151

    
1152
// Amplitude calculation from the differences
1153

    
1154
    floor1_flag[0]=1;
1155
    floor1_flag[1]=1;
1156
    floor1_Y_final[0]=floor1_Y[0];
1157
    floor1_Y_final[1]=floor1_Y[1];
1158

    
1159
    for(i=2;i<vf->x_list_dim;++i) {
1160
        uint_fast16_t val, highroom, lowroom, room;
1161
        uint_fast16_t high_neigh_offs;
1162
        uint_fast16_t low_neigh_offs;
1163

    
1164
        low_neigh_offs=vf->list[i].low;
1165
        high_neigh_offs=vf->list[i].high;
1166
        dy=floor1_Y_final[high_neigh_offs]-floor1_Y_final[low_neigh_offs];  // render_point begin
1167
        adx=vf->list[high_neigh_offs].x-vf->list[low_neigh_offs].x;
1168
        ady= FFABS(dy);
1169
        err=ady*(vf->list[i].x-vf->list[low_neigh_offs].x);
1170
        off=(int16_t)err/(int16_t)adx;
1171
        if (dy<0) {
1172
            predicted=floor1_Y_final[low_neigh_offs]-off;
1173
        } else {
1174
            predicted=floor1_Y_final[low_neigh_offs]+off;
1175
        } // render_point end
1176

    
1177
        val=floor1_Y[i];
1178
        highroom=range-predicted;
1179
        lowroom=predicted;
1180
        if (highroom < lowroom) {
1181
            room=highroom*2;
1182
        } else {
1183
            room=lowroom*2;   // SPEC mispelling
1184
        }
1185
        if (val) {
1186
            floor1_flag[low_neigh_offs]=1;
1187
            floor1_flag[high_neigh_offs]=1;
1188
            floor1_flag[i]=1;
1189
            if (val>=room) {
1190
                if (highroom > lowroom) {
1191
                    floor1_Y_final[i]=val-lowroom+predicted;
1192
                } else {
1193
                    floor1_Y_final[i]=predicted-val+highroom-1;
1194
                }
1195
            } else {
1196
                if (val & 1) {
1197
                    floor1_Y_final[i]=predicted-(val+1)/2;
1198
                } else {
1199
                    floor1_Y_final[i]=predicted+val/2;
1200
                }
1201
            }
1202
        } else {
1203
            floor1_flag[i]=0;
1204
            floor1_Y_final[i]=predicted;
1205
        }
1206

    
1207
        AV_DEBUG(" Decoded floor(%d) = %d / val %d \n", vf->list[i].x, floor1_Y_final[i], val);
1208
    }
1209

    
1210
// Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?
1211

    
1212
    ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);
1213

    
1214
    AV_DEBUG(" Floor decoded\n");
1215

    
1216
    return 0;
1217
}
1218

    
1219
// Read and decode residue
1220

    
1221
static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc, vorbis_residue *vr, uint_fast8_t ch, uint_fast8_t *do_not_decode, float *vec, uint_fast16_t vlen, int vr_type) {
1222
    GetBitContext *gb=&vc->gb;
1223
    uint_fast8_t c_p_c=vc->codebooks[vr->classbook].dimensions;
1224
    uint_fast16_t n_to_read=vr->end-vr->begin;
1225
    uint_fast16_t ptns_to_read=n_to_read/vr->partition_size;
1226
    uint_fast8_t classifs[ptns_to_read*vc->audio_channels];
1227
    uint_fast8_t pass;
1228
    uint_fast8_t ch_used;
1229
    uint_fast8_t i,j,l;
1230
    uint_fast16_t k;
1231

    
1232
    if (vr_type==2) {
1233
        for(j=1;j<ch;++j) {
1234
                do_not_decode[0]&=do_not_decode[j];  // FIXME - clobbering input
1235
        }
1236
        if (do_not_decode[0]) return 0;
1237
        ch_used=1;
1238
    } else {
1239
        ch_used=ch;
1240
    }
1241

    
1242
    AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);
1243

    
1244
    for(pass=0;pass<=vr->maxpass;++pass) { // FIXME OPTIMIZE?
1245
        uint_fast16_t voffset;
1246
        uint_fast16_t partition_count;
1247
        uint_fast16_t j_times_ptns_to_read;
1248

    
1249
        voffset=vr->begin;
1250
        for(partition_count=0;partition_count<ptns_to_read;) {  // SPEC        error
1251
            if (!pass) {
1252
                uint_fast32_t inverse_class = ff_inverse[vr->classifications];
1253
                for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {
1254
                    if (!do_not_decode[j]) {
1255
                        uint_fast32_t temp=get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,
1256
                        vc->codebooks[vr->classbook].nb_bits, 3);
1257

    
1258
                        AV_DEBUG("Classword: %d \n", temp);
1259

    
1260
                        assert(vr->classifications > 1 && temp<=65536); //needed for inverse[]
1261
                        for(i=0;i<c_p_c;++i) {
1262
                            uint_fast32_t temp2;
1263

    
1264
                            temp2=(((uint_fast64_t)temp) * inverse_class)>>32;
1265
                            if (partition_count+c_p_c-1-i < ptns_to_read) {
1266
                                classifs[j_times_ptns_to_read+partition_count+c_p_c-1-i]=temp-temp2*vr->classifications;
1267
                            }
1268
                            temp=temp2;
1269
                        }
1270
                    }
1271
                    j_times_ptns_to_read+=ptns_to_read;
1272
                }
1273
            }
1274
            for(i=0;(i<c_p_c) && (partition_count<ptns_to_read);++i) {
1275
                for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {
1276
                    uint_fast16_t voffs;
1277

    
1278
                    if (!do_not_decode[j]) {
1279
                        uint_fast8_t vqclass=classifs[j_times_ptns_to_read+partition_count];
1280
                        int_fast16_t vqbook=vr->books[vqclass][pass];
1281

    
1282
                        if (vqbook>=0 && vc->codebooks[vqbook].codevectors) {
1283
                            uint_fast16_t coffs;
1284
                            unsigned dim= vc->codebooks[vqbook].dimensions; // not uint_fast8_t: 64bit is slower here on amd64
1285
                            uint_fast16_t step= dim==1 ? vr->partition_size
1286
                                              : FASTDIV(vr->partition_size, dim);
1287
                            vorbis_codebook codebook= vc->codebooks[vqbook];
1288

    
1289
                            if (vr_type==0) {
1290

    
1291
                                voffs=voffset+j*vlen;
1292
                                for(k=0;k<step;++k) {
1293
                                    coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1294
                                    for(l=0;l<dim;++l) {
1295
                                        vec[voffs+k+l*step]+=codebook.codevectors[coffs+l];  // FPMATH
1296
                                    }
1297
                                }
1298
                            }
1299
                            else if (vr_type==1) {
1300
                                voffs=voffset+j*vlen;
1301
                                for(k=0;k<step;++k) {
1302
                                    coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1303
                                    for(l=0;l<dim;++l, ++voffs) {
1304
                                        vec[voffs]+=codebook.codevectors[coffs+l];  // FPMATH
1305

    
1306
                                        AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d  \n", pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);
1307
                                    }
1308
                                }
1309
                            }
1310
                            else if (vr_type==2 && ch==2 && (voffset&1)==0 && (dim&1)==0) { // most frequent case optimized
1311
                                voffs=voffset>>1;
1312

    
1313
                                if(dim==2) {
1314
                                    for(k=0;k<step;++k) {
1315
                                        coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;
1316
                                        vec[voffs+k     ]+=codebook.codevectors[coffs  ];  // FPMATH
1317
                                        vec[voffs+k+vlen]+=codebook.codevectors[coffs+1];  // FPMATH
1318
                                    }
1319
                                } else if(dim==4) {
1320
                                    for(k=0;k<step;++k, voffs+=2) {
1321
                                        coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4;
1322
                                        vec[voffs       ]+=codebook.codevectors[coffs  ];  // FPMATH
1323
                                        vec[voffs+1     ]+=codebook.codevectors[coffs+2];  // FPMATH
1324
                                        vec[voffs+vlen  ]+=codebook.codevectors[coffs+1];  // FPMATH
1325
                                        vec[voffs+vlen+1]+=codebook.codevectors[coffs+3];  // FPMATH
1326
                                    }
1327
                                } else
1328
                                for(k=0;k<step;++k) {
1329
                                    coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1330
                                    for(l=0;l<dim;l+=2, voffs++) {
1331
                                        vec[voffs     ]+=codebook.codevectors[coffs+l  ];  // FPMATH
1332
                                        vec[voffs+vlen]+=codebook.codevectors[coffs+l+1];  // FPMATH
1333

    
1334
                                        AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d+%d  \n", pass, voffset/ch+(voffs%ch)*vlen, vec[voffset/ch+(voffs%ch)*vlen], codebook.codevectors[coffs+l], coffs, l);
1335
                                    }
1336
                                }
1337

    
1338
                            }
1339
                            else if (vr_type==2) {
1340
                                voffs=voffset;
1341

    
1342
                                for(k=0;k<step;++k) {
1343
                                    coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1344
                                    for(l=0;l<dim;++l, ++voffs) {
1345
                                        vec[voffs/ch+(voffs%ch)*vlen]+=codebook.codevectors[coffs+l];  // FPMATH FIXME use if and counter instead of / and %
1346

    
1347
                                        AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d+%d  \n", pass, voffset/ch+(voffs%ch)*vlen, vec[voffset/ch+(voffs%ch)*vlen], codebook.codevectors[coffs+l], coffs, l);
1348
                                    }
1349
                                }
1350
                            }
1351
                        }
1352
                    }
1353
                    j_times_ptns_to_read+=ptns_to_read;
1354
                }
1355
                ++partition_count;
1356
                voffset+=vr->partition_size;
1357
            }
1358
        }
1359
    }
1360
    return 0;
1361
}
1362

    
1363
static inline int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr, uint_fast8_t ch, uint_fast8_t *do_not_decode, float *vec, uint_fast16_t vlen)
1364
{
1365
    if (vr->type==2)
1366
        return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 2);
1367
    else if (vr->type==1)
1368
        return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 1);
1369
    else if (vr->type==0)
1370
        return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 0);
1371
    else {
1372
        av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");
1373
        return 1;
1374
    }
1375
}
1376

    
1377
void vorbis_inverse_coupling(float *mag, float *ang, int blocksize)
1378
{
1379
    int i;
1380
    for(i=0; i<blocksize; i++)
1381
    {
1382
        if (mag[i]>0.0) {
1383
            if (ang[i]>0.0) {
1384
                ang[i]=mag[i]-ang[i];
1385
            } else {
1386
                float temp=ang[i];
1387
                ang[i]=mag[i];
1388
                mag[i]+=temp;
1389
            }
1390
        } else {
1391
            if (ang[i]>0.0) {
1392
                ang[i]+=mag[i];
1393
            } else {
1394
                float temp=ang[i];
1395
                ang[i]=mag[i];
1396
                mag[i]-=temp;
1397
            }
1398
        }
1399
    }
1400
}
1401

    
1402
static void copy_normalize(float *dst, float *src, int len, int exp_bias, float add_bias)
1403
{
1404
    int i;
1405
    if(exp_bias) {
1406
        memcpy(dst, src, len * sizeof(float));
1407
    } else {
1408
        for(i=0; i<len; i++)
1409
            dst[i] = src[i] + add_bias;
1410
    }
1411
}
1412

    
1413
// Decode the audio packet using the functions above
1414

    
1415
static int vorbis_parse_audio_packet(vorbis_context *vc) {
1416
    GetBitContext *gb=&vc->gb;
1417

    
1418
    uint_fast8_t previous_window=vc->previous_window;
1419
    uint_fast8_t mode_number;
1420
    uint_fast8_t blockflag;
1421
    uint_fast16_t blocksize;
1422
    int_fast32_t i,j;
1423
    uint_fast8_t no_residue[vc->audio_channels];
1424
    uint_fast8_t do_not_decode[vc->audio_channels];
1425
    vorbis_mapping *mapping;
1426
    float *ch_res_ptr=vc->channel_residues;
1427
    float *ch_floor_ptr=vc->channel_floors;
1428
    uint_fast8_t res_chan[vc->audio_channels];
1429
    uint_fast8_t res_num=0;
1430
    int_fast16_t retlen=0;
1431
    float fadd_bias = vc->add_bias;
1432

    
1433
    if (get_bits1(gb)) {
1434
        av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");
1435
        return -1; // packet type not audio
1436
    }
1437

    
1438
    if (vc->mode_count==1) {
1439
        mode_number=0;
1440
    } else {
1441
        mode_number=get_bits(gb, ilog(vc->mode_count-1));
1442
    }
1443
    vc->mode_number=mode_number;
1444
    mapping=&vc->mappings[vc->modes[mode_number].mapping];
1445

    
1446
    AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);
1447

    
1448
    blockflag=vc->modes[mode_number].blockflag;
1449
    blocksize=vc->blocksize[blockflag];
1450
    if (blockflag) {
1451
        skip_bits(gb, 2); // previous_window, next_window
1452
    }
1453

    
1454
    memset(ch_res_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?
1455
    memset(ch_floor_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?
1456

    
1457
// Decode floor
1458

    
1459
    for(i=0;i<vc->audio_channels;++i) {
1460
        vorbis_floor *floor;
1461
        if (mapping->submaps>1) {
1462
            floor=&vc->floors[mapping->submap_floor[mapping->mux[i]]];
1463
        } else {
1464
            floor=&vc->floors[mapping->submap_floor[0]];
1465
        }
1466

    
1467
        no_residue[i]=floor->decode(vc, &floor->data, ch_floor_ptr);
1468
        ch_floor_ptr+=blocksize/2;
1469
    }
1470

    
1471
// Nonzero vector propagate
1472

    
1473
    for(i=mapping->coupling_steps-1;i>=0;--i) {
1474
        if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {
1475
            no_residue[mapping->magnitude[i]]=0;
1476
            no_residue[mapping->angle[i]]=0;
1477
        }
1478
    }
1479

    
1480
// Decode residue
1481

    
1482
    for(i=0;i<mapping->submaps;++i) {
1483
        vorbis_residue *residue;
1484
        uint_fast8_t ch=0;
1485

    
1486
        for(j=0;j<vc->audio_channels;++j) {
1487
            if ((mapping->submaps==1) || (i=mapping->mux[j])) {
1488
                res_chan[j]=res_num;
1489
                if (no_residue[j]) {
1490
                    do_not_decode[ch]=1;
1491
                } else {
1492
                    do_not_decode[ch]=0;
1493
                }
1494
                ++ch;
1495
                ++res_num;
1496
            }
1497
        }
1498
        residue=&vc->residues[mapping->submap_residue[i]];
1499
        vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);
1500

    
1501
        ch_res_ptr+=ch*blocksize/2;
1502
    }
1503

    
1504
// Inverse coupling
1505

    
1506
    for(i=mapping->coupling_steps-1;i>=0;--i) { //warning: i has to be signed
1507
        float *mag, *ang;
1508

    
1509
        mag=vc->channel_residues+res_chan[mapping->magnitude[i]]*blocksize/2;
1510
        ang=vc->channel_residues+res_chan[mapping->angle[i]]*blocksize/2;
1511
        vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize/2);
1512
    }
1513

    
1514
// Dotproduct, MDCT
1515

    
1516
    for(j=vc->audio_channels-1;j>=0;j--) {
1517
        ch_floor_ptr=vc->channel_floors+j*blocksize/2;
1518
        ch_res_ptr=vc->channel_residues+res_chan[j]*blocksize/2;
1519
        vc->dsp.vector_fmul(ch_floor_ptr, ch_res_ptr, blocksize/2);
1520
        ff_imdct_half(&vc->mdct[blockflag], ch_res_ptr, ch_floor_ptr);
1521
    }
1522

    
1523
// Overlap/add, save data for next overlapping  FPMATH
1524

    
1525
    retlen = (blocksize + vc->blocksize[previous_window])/4;
1526
    for(j=0;j<vc->audio_channels;j++) {
1527
        uint_fast16_t bs0=vc->blocksize[0];
1528
        uint_fast16_t bs1=vc->blocksize[1];
1529
        float *residue=vc->channel_residues+res_chan[j]*blocksize/2;
1530
        float *saved=vc->saved+j*bs1/4;
1531
        float *ret=vc->channel_floors+j*retlen;
1532
        float *buf=residue;
1533
        const float *win=vc->win[blockflag&previous_window];
1534

    
1535
        if(blockflag == previous_window) {
1536
            vc->dsp.vector_fmul_window(ret, saved, buf, win, fadd_bias, blocksize/4);
1537
        } else if(blockflag > previous_window) {
1538
            vc->dsp.vector_fmul_window(ret, saved, buf, win, fadd_bias, bs0/4);
1539
            copy_normalize(ret+bs0/2, buf+bs0/4, (bs1-bs0)/4, vc->exp_bias, fadd_bias);
1540
        } else {
1541
            copy_normalize(ret, saved, (bs1-bs0)/4, vc->exp_bias, fadd_bias);
1542
            vc->dsp.vector_fmul_window(ret+(bs1-bs0)/4, saved+(bs1-bs0)/4, buf, win, fadd_bias, bs0/4);
1543
        }
1544
        memcpy(saved, buf+blocksize/4, blocksize/4*sizeof(float));
1545
    }
1546

    
1547
    vc->previous_window = blockflag;
1548
    return retlen;
1549
}
1550

    
1551
// Return the decoded audio packet through the standard api
1552

    
1553
static int vorbis_decode_frame(AVCodecContext *avccontext,
1554
                        void *data, int *data_size,
1555
                        AVPacket *avpkt)
1556
{
1557
    const uint8_t *buf = avpkt->data;
1558
    int buf_size = avpkt->size;
1559
    vorbis_context *vc = avccontext->priv_data ;
1560
    GetBitContext *gb = &(vc->gb);
1561
    const float *channel_ptrs[vc->audio_channels];
1562
    int i;
1563

    
1564
    int_fast16_t len;
1565

    
1566
    if(!buf_size){
1567
        return 0;
1568
    }
1569

    
1570
    AV_DEBUG("packet length %d \n", buf_size);
1571

    
1572
    init_get_bits(gb, buf, buf_size*8);
1573

    
1574
    len=vorbis_parse_audio_packet(vc);
1575

    
1576
    if (len<=0) {
1577
        *data_size=0;
1578
        return buf_size;
1579
    }
1580

    
1581
    if (!vc->first_frame) {
1582
        vc->first_frame=1;
1583
        *data_size=0;
1584
        return buf_size ;
1585
    }
1586

    
1587
    AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);
1588

    
1589
    for(i=0; i<vc->audio_channels; i++)
1590
        channel_ptrs[i] = vc->channel_floors+i*len;
1591
    vc->dsp.float_to_int16_interleave(data, channel_ptrs, len, vc->audio_channels);
1592
    *data_size=len*2*vc->audio_channels;
1593

    
1594
    return buf_size ;
1595
}
1596

    
1597
// Close decoder
1598

    
1599
static av_cold int vorbis_decode_close(AVCodecContext *avccontext) {
1600
    vorbis_context *vc = avccontext->priv_data;
1601

    
1602
    vorbis_free(vc);
1603

    
1604
    return 0 ;
1605
}
1606

    
1607
AVCodec vorbis_decoder = {
1608
    "vorbis",
1609
    CODEC_TYPE_AUDIO,
1610
    CODEC_ID_VORBIS,
1611
    sizeof(vorbis_context),
1612
    vorbis_decode_init,
1613
    NULL,
1614
    vorbis_decode_close,
1615
    vorbis_decode_frame,
1616
    .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),
1617
};
1618