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ffmpeg / libavcodec / vorbis_dec.c @ 07c55d8e

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1
/**
2
 * @file 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.
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 *
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
16
 * Lesser General Public License for more details.
17
 *
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 * 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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 *
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 */
23

    
24
#undef V_DEBUG
25
//#define V_DEBUG
26
//#define AV_DEBUG(...) av_log(NULL, AV_LOG_INFO, __VA_ARGS__)
27

    
28
#include <math.h>
29

    
30
#define ALT_BITSTREAM_READER_LE
31
#include "avcodec.h"
32
#include "bitstream.h"
33
#include "dsputil.h"
34

    
35
#include "vorbis.h"
36
#include "xiph.h"
37

    
38
#define V_NB_BITS 8
39
#define V_NB_BITS2 11
40
#define V_MAX_VLCS (1<<16)
41

    
42
#ifndef V_DEBUG
43
#define AV_DEBUG(...)
44
#endif
45

    
46
#undef NDEBUG
47
#include <assert.h>
48

    
49
typedef struct {
50
    uint_fast8_t dimensions;
51
    uint_fast8_t lookup_type;
52
    uint_fast8_t maxdepth;
53
    VLC vlc;
54
    float *codevectors;
55
    unsigned int nb_bits;
56
} vorbis_codebook;
57

    
58
typedef union vorbis_floor_u vorbis_floor_data;
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typedef struct vorbis_floor0_s vorbis_floor0;
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typedef struct vorbis_floor1_s vorbis_floor1;
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struct vorbis_context_s;
62
typedef
63
uint_fast8_t (* vorbis_floor_decode_func)
64
             (struct vorbis_context_s *, vorbis_floor_data *, float *);
65
typedef struct {
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    uint_fast8_t floor_type;
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    vorbis_floor_decode_func decode;
68
    union vorbis_floor_u
69
    {
70
        struct vorbis_floor0_s
71
        {
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            uint_fast8_t order;
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            uint_fast16_t rate;
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            uint_fast16_t bark_map_size;
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            int_fast32_t * map[2];
76
            uint_fast32_t map_size[2];
77
            uint_fast8_t amplitude_bits;
78
            uint_fast8_t amplitude_offset;
79
            uint_fast8_t num_books;
80
            uint_fast8_t * book_list;
81
            float * lsp;
82
        } t0;
83
        struct vorbis_floor1_s
84
        {
85
            uint_fast8_t partitions;
86
            uint_fast8_t maximum_class;
87
            uint_fast8_t partition_class[32];
88
            uint_fast8_t class_dimensions[16];
89
            uint_fast8_t class_subclasses[16];
90
            uint_fast8_t class_masterbook[16];
91
            int_fast16_t subclass_books[16][8];
92
            uint_fast8_t multiplier;
93
            uint_fast16_t x_list_dim;
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            floor1_entry_t * list;
95
        } t1;
96
    } data;
97
} vorbis_floor;
98

    
99
typedef struct {
100
    uint_fast16_t type;
101
    uint_fast32_t begin;
102
    uint_fast32_t end;
103
    uint_fast32_t partition_size;
104
    uint_fast8_t classifications;
105
    uint_fast8_t classbook;
106
    int_fast16_t books[64][8];
107
    uint_fast8_t maxpass;
108
} vorbis_residue;
109

    
110
typedef struct {
111
    uint_fast8_t submaps;
112
    uint_fast16_t coupling_steps;
113
    uint_fast8_t *magnitude;
114
    uint_fast8_t *angle;
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    uint_fast8_t *mux;
116
    uint_fast8_t submap_floor[16];
117
    uint_fast8_t submap_residue[16];
118
} vorbis_mapping;
119

    
120
typedef struct {
121
    uint_fast8_t blockflag;
122
    uint_fast16_t windowtype;
123
    uint_fast16_t transformtype;
124
    uint_fast8_t mapping;
125
} vorbis_mode;
126

    
127
typedef struct vorbis_context_s {
128
    AVCodecContext *avccontext;
129
    GetBitContext gb;
130
    DSPContext dsp;
131

    
132
    MDCTContext mdct[2];
133
    uint_fast8_t first_frame;
134
    uint_fast32_t version;
135
    uint_fast8_t audio_channels;
136
    uint_fast32_t audio_samplerate;
137
    uint_fast32_t bitrate_maximum;
138
    uint_fast32_t bitrate_nominal;
139
    uint_fast32_t bitrate_minimum;
140
    uint_fast32_t blocksize[2];
141
    const float * win[2];
142
    uint_fast16_t codebook_count;
143
    vorbis_codebook *codebooks;
144
    uint_fast8_t floor_count;
145
    vorbis_floor *floors;
146
    uint_fast8_t residue_count;
147
    vorbis_residue *residues;
148
    uint_fast8_t mapping_count;
149
    vorbis_mapping *mappings;
150
    uint_fast8_t mode_count;
151
    vorbis_mode *modes;
152
    uint_fast8_t mode_number; // mode number for the current packet
153
    float *channel_residues;
154
    float *channel_floors;
155
    float *saved;
156
    uint_fast16_t saved_start;
157
    float *ret;
158
    float *buf;
159
    float *buf_tmp;
160
    uint_fast32_t add_bias; // for float->int conversion
161
    uint_fast32_t exp_bias;
162
} vorbis_context;
163

    
164
/* Helper functions */
165

    
166
#define BARK(x) \
167
    (13.1f*atan(0.00074f*(x))+2.24f*atan(1.85e-8f*(x)*(x))+1e-4f*(x))
168

    
169
static float vorbisfloat2float(uint_fast32_t val) {
170
    double mant=val&0x1fffff;
171
    long exp=(val&0x7fe00000L)>>21;
172
    if (val&0x80000000) mant=-mant;
173
    return(ldexp(mant, exp-20-768));
174
}
175

    
176

    
177
// Free all allocated memory -----------------------------------------
178

    
179
static void vorbis_free(vorbis_context *vc) {
180
    int_fast16_t i;
181

    
182
    av_freep(&vc->channel_residues);
183
    av_freep(&vc->channel_floors);
184
    av_freep(&vc->saved);
185
    av_freep(&vc->ret);
186
    av_freep(&vc->buf);
187
    av_freep(&vc->buf_tmp);
188

    
189
    av_freep(&vc->residues);
190
    av_freep(&vc->modes);
191

    
192
    ff_mdct_end(&vc->mdct[0]);
193
    ff_mdct_end(&vc->mdct[1]);
194

    
195
    for(i=0;i<vc->codebook_count;++i) {
196
        av_free(vc->codebooks[i].codevectors);
197
        free_vlc(&vc->codebooks[i].vlc);
198
    }
199
    av_freep(&vc->codebooks);
200

    
201
    for(i=0;i<vc->floor_count;++i) {
202
        if(vc->floors[i].floor_type==0) {
203
            av_free(vc->floors[i].data.t0.map[0]);
204
            av_free(vc->floors[i].data.t0.map[1]);
205
            av_free(vc->floors[i].data.t0.book_list);
206
            av_free(vc->floors[i].data.t0.lsp);
207
        }
208
        else {
209
            av_free(vc->floors[i].data.t1.list);
210
        }
211
    }
212
    av_freep(&vc->floors);
213

    
214
    for(i=0;i<vc->mapping_count;++i) {
215
        av_free(vc->mappings[i].magnitude);
216
        av_free(vc->mappings[i].angle);
217
        av_free(vc->mappings[i].mux);
218
    }
219
    av_freep(&vc->mappings);
220

    
221
    if(vc->exp_bias){
222
        av_freep(&vc->win[0]);
223
        av_freep(&vc->win[1]);
224
    }
225
}
226

    
227
// Parse setup header -------------------------------------------------
228

    
229
// Process codebooks part
230

    
231
static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc) {
232
    uint_fast16_t cb;
233
    uint8_t *tmp_vlc_bits;
234
    uint32_t *tmp_vlc_codes;
235
    GetBitContext *gb=&vc->gb;
236

    
237
    vc->codebook_count=get_bits(gb,8)+1;
238

    
239
    AV_DEBUG(" Codebooks: %d \n", vc->codebook_count);
240

    
241
    vc->codebooks=(vorbis_codebook *)av_mallocz(vc->codebook_count * sizeof(vorbis_codebook));
242
    tmp_vlc_bits=(uint8_t *)av_mallocz(V_MAX_VLCS * sizeof(uint8_t));
243
    tmp_vlc_codes=(uint32_t *)av_mallocz(V_MAX_VLCS * sizeof(uint32_t));
244

    
245
    for(cb=0;cb<vc->codebook_count;++cb) {
246
        vorbis_codebook *codebook_setup=&vc->codebooks[cb];
247
        uint_fast8_t ordered;
248
        uint_fast32_t t, used_entries=0;
249
        uint_fast32_t entries;
250

    
251
        AV_DEBUG(" %d. Codebook \n", cb);
252

    
253
        if (get_bits(gb, 24)!=0x564342) {
254
            av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook setup data corrupt. \n", cb);
255
            goto error;
256
        }
257

    
258
        codebook_setup->dimensions=get_bits(gb, 16);
259
        if (codebook_setup->dimensions>16) {
260
            av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook's dimension is too large (%d). \n", cb, codebook_setup->dimensions);
261
            goto error;
262
        }
263
        entries=get_bits(gb, 24);
264
        if (entries>V_MAX_VLCS) {
265
            av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook has too many entries (%"PRIdFAST32"). \n", cb, entries);
266
            goto error;
267
        }
268

    
269
        ordered=get_bits1(gb);
270

    
271
        AV_DEBUG(" codebook_dimensions %d, codebook_entries %d \n", codebook_setup->dimensions, entries);
272

    
273
        if (!ordered) {
274
            uint_fast16_t ce;
275
            uint_fast8_t flag;
276
            uint_fast8_t sparse=get_bits1(gb);
277

    
278
            AV_DEBUG(" not ordered \n");
279

    
280
            if (sparse) {
281
                AV_DEBUG(" sparse \n");
282

    
283
                used_entries=0;
284
                for(ce=0;ce<entries;++ce) {
285
                    flag=get_bits1(gb);
286
                    if (flag) {
287
                        tmp_vlc_bits[ce]=get_bits(gb, 5)+1;
288
                        ++used_entries;
289
                    }
290
                    else tmp_vlc_bits[ce]=0;
291
                }
292
            } else {
293
                AV_DEBUG(" not sparse \n");
294

    
295
                used_entries=entries;
296
                for(ce=0;ce<entries;++ce) {
297
                    tmp_vlc_bits[ce]=get_bits(gb, 5)+1;
298
                }
299
            }
300
        } else {
301
            uint_fast16_t current_entry=0;
302
            uint_fast8_t current_length=get_bits(gb, 5)+1;
303

    
304
            AV_DEBUG(" ordered, current length: %d \n", current_length);  //FIXME
305

    
306
            used_entries=entries;
307
            for(;current_entry<used_entries;++current_length) {
308
                uint_fast16_t i, number;
309

    
310
                AV_DEBUG(" number bits: %d ", ilog(entries - current_entry));
311

    
312
                number=get_bits(gb, ilog(entries - current_entry));
313

    
314
                AV_DEBUG(" number: %d \n", number);
315

    
316
                for(i=current_entry;i<number+current_entry;++i) {
317
                    if (i<used_entries) tmp_vlc_bits[i]=current_length;
318
                }
319

    
320
                current_entry+=number;
321
            }
322
            if (current_entry>used_entries) {
323
                av_log(vc->avccontext, AV_LOG_ERROR, " More codelengths than codes in codebook. \n");
324
                goto error;
325
            }
326
        }
327

    
328
        codebook_setup->lookup_type=get_bits(gb, 4);
329

    
330
        AV_DEBUG(" lookup type: %d : %s \n", codebook_setup->lookup_type, codebook_setup->lookup_type ? "vq" : "no lookup" );
331

    
332
// If the codebook is used for (inverse) VQ, calculate codevectors.
333

    
334
        if (codebook_setup->lookup_type==1) {
335
            uint_fast16_t i, j, k;
336
            uint_fast16_t codebook_lookup_values=ff_vorbis_nth_root(entries, codebook_setup->dimensions);
337
            uint_fast16_t codebook_multiplicands[codebook_lookup_values];
338

    
339
            float codebook_minimum_value=vorbisfloat2float(get_bits_long(gb, 32));
340
            float codebook_delta_value=vorbisfloat2float(get_bits_long(gb, 32));
341
            uint_fast8_t codebook_value_bits=get_bits(gb, 4)+1;
342
            uint_fast8_t codebook_sequence_p=get_bits1(gb);
343

    
344
            AV_DEBUG(" We expect %d numbers for building the codevectors. \n", codebook_lookup_values);
345
            AV_DEBUG("  delta %f minmum %f \n", codebook_delta_value, codebook_minimum_value);
346

    
347
            for(i=0;i<codebook_lookup_values;++i) {
348
                codebook_multiplicands[i]=get_bits(gb, codebook_value_bits);
349

    
350
                AV_DEBUG(" multiplicands*delta+minmum : %e \n", (float)codebook_multiplicands[i]*codebook_delta_value+codebook_minimum_value);
351
                AV_DEBUG(" multiplicand %d \n", codebook_multiplicands[i]);
352
            }
353

    
354
// Weed out unused vlcs and build codevector vector
355
            codebook_setup->codevectors=(float *)av_mallocz(used_entries*codebook_setup->dimensions * sizeof(float));
356
            for(j=0, i=0;i<entries;++i) {
357
                uint_fast8_t dim=codebook_setup->dimensions;
358

    
359
                if (tmp_vlc_bits[i]) {
360
                    float last=0.0;
361
                    uint_fast32_t lookup_offset=i;
362

    
363
#ifdef V_DEBUG
364
                    av_log(vc->avccontext, AV_LOG_INFO, "Lookup offset %d ,", i);
365
#endif
366

    
367
                    for(k=0;k<dim;++k) {
368
                        uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values;
369
                        codebook_setup->codevectors[j*dim+k]=codebook_multiplicands[multiplicand_offset]*codebook_delta_value+codebook_minimum_value+last;
370
                        if (codebook_sequence_p) {
371
                            last=codebook_setup->codevectors[j*dim+k];
372
                        }
373
                        lookup_offset/=codebook_lookup_values;
374
                    }
375
                    tmp_vlc_bits[j]=tmp_vlc_bits[i];
376

    
377
#ifdef V_DEBUG
378
                    av_log(vc->avccontext, AV_LOG_INFO, "real lookup offset %d, vector: ", j);
379
                    for(k=0;k<dim;++k) {
380
                        av_log(vc->avccontext, AV_LOG_INFO, " %f ", codebook_setup->codevectors[j*dim+k]);
381
                    }
382
                    av_log(vc->avccontext, AV_LOG_INFO, "\n");
383
#endif
384

    
385
                    ++j;
386
                }
387
            }
388
            if (j!=used_entries) {
389
                av_log(vc->avccontext, AV_LOG_ERROR, "Bug in codevector vector building code. \n");
390
                goto error;
391
            }
392
            entries=used_entries;
393
        }
394
        else if (codebook_setup->lookup_type>=2) {
395
            av_log(vc->avccontext, AV_LOG_ERROR, "Codebook lookup type not supported. \n");
396
            goto error;
397
        }
398

    
399
// Initialize VLC table
400
        if (ff_vorbis_len2vlc(tmp_vlc_bits, tmp_vlc_codes, entries)) {
401
            av_log(vc->avccontext, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");
402
            goto error;
403
        }
404
        codebook_setup->maxdepth=0;
405
        for(t=0;t<entries;++t)
406
            if (tmp_vlc_bits[t]>=codebook_setup->maxdepth) codebook_setup->maxdepth=tmp_vlc_bits[t];
407

    
408
        if(codebook_setup->maxdepth > 3*V_NB_BITS) codebook_setup->nb_bits=V_NB_BITS2;
409
        else                                       codebook_setup->nb_bits=V_NB_BITS;
410

    
411
        codebook_setup->maxdepth=(codebook_setup->maxdepth+codebook_setup->nb_bits-1)/codebook_setup->nb_bits;
412

    
413
        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)) {
414
            av_log(vc->avccontext, AV_LOG_ERROR, " Error generating vlc tables. \n");
415
            goto error;
416
        }
417
    }
418

    
419
    av_free(tmp_vlc_bits);
420
    av_free(tmp_vlc_codes);
421
    return 0;
422

    
423
// Error:
424
error:
425
    av_free(tmp_vlc_bits);
426
    av_free(tmp_vlc_codes);
427
    return 1;
428
}
429

    
430
// Process time domain transforms part (unused in Vorbis I)
431

    
432
static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc) {
433
    GetBitContext *gb=&vc->gb;
434
    uint_fast8_t i;
435
    uint_fast8_t vorbis_time_count=get_bits(gb, 6)+1;
436

    
437
    for(i=0;i<vorbis_time_count;++i) {
438
        uint_fast16_t vorbis_tdtransform=get_bits(gb, 16);
439

    
440
        AV_DEBUG(" Vorbis time domain transform %d: %d \n", vorbis_time_count, vorbis_tdtransform);
441

    
442
        if (vorbis_tdtransform) {
443
            av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n");
444
            return 1;
445
        }
446
    }
447
    return 0;
448
}
449

    
450
// Process floors part
451

    
452
static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,
453
                                         vorbis_floor_data *vfu, float *vec);
454
static void create_map( vorbis_context * vc, uint_fast8_t floor_number );
455
static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc,
456
                                         vorbis_floor_data *vfu, float *vec);
457
static int vorbis_parse_setup_hdr_floors(vorbis_context *vc) {
458
    GetBitContext *gb=&vc->gb;
459
    uint_fast16_t i,j,k;
460

    
461
    vc->floor_count=get_bits(gb, 6)+1;
462

    
463
    vc->floors=(vorbis_floor *)av_mallocz(vc->floor_count * sizeof(vorbis_floor));
464

    
465
    for (i=0;i<vc->floor_count;++i) {
466
        vorbis_floor *floor_setup=&vc->floors[i];
467

    
468
        floor_setup->floor_type=get_bits(gb, 16);
469

    
470
        AV_DEBUG(" %d. floor type %d \n", i, floor_setup->floor_type);
471

    
472
        if (floor_setup->floor_type==1) {
473
            uint_fast8_t maximum_class=0;
474
            uint_fast8_t rangebits;
475
            uint_fast16_t floor1_values=2;
476

    
477
            floor_setup->decode=vorbis_floor1_decode;
478

    
479
            floor_setup->data.t1.partitions=get_bits(gb, 5);
480

    
481
            AV_DEBUG(" %d.floor: %d partitions \n", i, floor_setup->data.t1.partitions);
482

    
483
            for(j=0;j<floor_setup->data.t1.partitions;++j) {
484
                floor_setup->data.t1.partition_class[j]=get_bits(gb, 4);
485
                if (floor_setup->data.t1.partition_class[j]>maximum_class) maximum_class=floor_setup->data.t1.partition_class[j];
486

    
487
                AV_DEBUG(" %d. floor %d partition class %d \n", i, j, floor_setup->data.t1.partition_class[j]);
488

    
489
            }
490

    
491
            AV_DEBUG(" maximum class %d \n", maximum_class);
492

    
493
            floor_setup->data.t1.maximum_class=maximum_class;
494

    
495
            for(j=0;j<=maximum_class;++j) {
496
                floor_setup->data.t1.class_dimensions[j]=get_bits(gb, 3)+1;
497
                floor_setup->data.t1.class_subclasses[j]=get_bits(gb, 2);
498

    
499
                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]);
500

    
501
                if (floor_setup->data.t1.class_subclasses[j]) {
502
                    floor_setup->data.t1.class_masterbook[j]=get_bits(gb, 8);
503

    
504
                    AV_DEBUG("   masterbook: %d \n", floor_setup->data.t1.class_masterbook[j]);
505
                }
506

    
507
                for(k=0;k<(1<<floor_setup->data.t1.class_subclasses[j]);++k) {
508
                    floor_setup->data.t1.subclass_books[j][k]=(int16_t)get_bits(gb, 8)-1;
509

    
510
                    AV_DEBUG("    book %d. : %d \n", k, floor_setup->data.t1.subclass_books[j][k]);
511
                }
512
            }
513

    
514
            floor_setup->data.t1.multiplier=get_bits(gb, 2)+1;
515
            floor_setup->data.t1.x_list_dim=2;
516

    
517
            for(j=0;j<floor_setup->data.t1.partitions;++j) {
518
                floor_setup->data.t1.x_list_dim+=floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];
519
            }
520

    
521
            floor_setup->data.t1.list=(floor1_entry_t *)av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(floor1_entry_t));
522

    
523

    
524
            rangebits=get_bits(gb, 4);
525
            floor_setup->data.t1.list[0].x = 0;
526
            floor_setup->data.t1.list[1].x = (1<<rangebits);
527

    
528
            for(j=0;j<floor_setup->data.t1.partitions;++j) {
529
                for(k=0;k<floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];++k,++floor1_values) {
530
                    floor_setup->data.t1.list[floor1_values].x=get_bits(gb, rangebits);
531

    
532
                    AV_DEBUG(" %d. floor1 Y coord. %d \n", floor1_values, floor_setup->data.t1.list[floor1_values].x);
533
                }
534
            }
535

    
536
// Precalculate order of x coordinates - needed for decode
537
            ff_vorbis_ready_floor1_list(floor_setup->data.t1.list, floor_setup->data.t1.x_list_dim);
538
        }
539
        else if(floor_setup->floor_type==0) {
540
            uint_fast8_t max_codebook_dim=0;
541

    
542
            floor_setup->decode=vorbis_floor0_decode;
543

    
544
            floor_setup->data.t0.order=get_bits(gb, 8);
545
            floor_setup->data.t0.rate=get_bits(gb, 16);
546
            floor_setup->data.t0.bark_map_size=get_bits(gb, 16);
547
            floor_setup->data.t0.amplitude_bits=get_bits(gb, 6);
548
            /* zero would result in a div by zero later *
549
             * 2^0 - 1 == 0                             */
550
            if (floor_setup->data.t0.amplitude_bits == 0) {
551
              av_log(vc->avccontext, AV_LOG_ERROR,
552
                     "Floor 0 amplitude bits is 0.\n");
553
              return 1;
554
            }
555
            floor_setup->data.t0.amplitude_offset=get_bits(gb, 8);
556
            floor_setup->data.t0.num_books=get_bits(gb, 4)+1;
557

    
558
            /* allocate mem for booklist */
559
            floor_setup->data.t0.book_list=
560
                av_malloc(floor_setup->data.t0.num_books);
561
            if(!floor_setup->data.t0.book_list) { return 1; }
562
            /* read book indexes */
563
            {
564
                int idx;
565
                uint_fast8_t book_idx;
566
                for (idx=0;idx<floor_setup->data.t0.num_books;++idx) {
567
                    book_idx=get_bits(gb, 8);
568
                    floor_setup->data.t0.book_list[idx]=book_idx;
569
                    if (vc->codebooks[book_idx].dimensions > max_codebook_dim)
570
                        max_codebook_dim=vc->codebooks[book_idx].dimensions;
571

    
572
                    if (floor_setup->data.t0.book_list[idx]>vc->codebook_count)
573
                        return 1;
574
                }
575
            }
576

    
577
            create_map( vc, i );
578

    
579
            /* allocate mem for lsp coefficients */
580
            {
581
                /* codebook dim is for padding if codebook dim doesn't *
582
                 * divide order+1 then we need to read more data       */
583
                floor_setup->data.t0.lsp=
584
                    av_malloc((floor_setup->data.t0.order+1 + max_codebook_dim)
585
                              * sizeof(float));
586
                if(!floor_setup->data.t0.lsp) { return 1; }
587
            }
588

    
589
#ifdef V_DEBUG /* debug output parsed headers */
590
            AV_DEBUG("floor0 order: %u\n", floor_setup->data.t0.order);
591
            AV_DEBUG("floor0 rate: %u\n", floor_setup->data.t0.rate);
592
            AV_DEBUG("floor0 bark map size: %u\n",
593
              floor_setup->data.t0.bark_map_size);
594
            AV_DEBUG("floor0 amplitude bits: %u\n",
595
              floor_setup->data.t0.amplitude_bits);
596
            AV_DEBUG("floor0 amplitude offset: %u\n",
597
              floor_setup->data.t0.amplitude_offset);
598
            AV_DEBUG("floor0 number of books: %u\n",
599
              floor_setup->data.t0.num_books);
600
            AV_DEBUG("floor0 book list pointer: %p\n",
601
              floor_setup->data.t0.book_list);
602
            {
603
              int idx;
604
              for (idx=0;idx<floor_setup->data.t0.num_books;++idx) {
605
                AV_DEBUG( "  Book %d: %u\n",
606
                  idx+1,
607
                  floor_setup->data.t0.book_list[idx] );
608
              }
609
            }
610
#endif
611
        }
612
        else {
613
            av_log(vc->avccontext, AV_LOG_ERROR, "Invalid floor type!\n");
614
            return 1;
615
        }
616
    }
617
    return 0;
618
}
619

    
620
// Process residues part
621

    
622
static int vorbis_parse_setup_hdr_residues(vorbis_context *vc){
623
    GetBitContext *gb=&vc->gb;
624
    uint_fast8_t i, j, k;
625

    
626
    vc->residue_count=get_bits(gb, 6)+1;
627
    vc->residues=(vorbis_residue *)av_mallocz(vc->residue_count * sizeof(vorbis_residue));
628

    
629
    AV_DEBUG(" There are %d residues. \n", vc->residue_count);
630

    
631
    for(i=0;i<vc->residue_count;++i) {
632
        vorbis_residue *res_setup=&vc->residues[i];
633
        uint_fast8_t cascade[64];
634
        uint_fast8_t high_bits;
635
        uint_fast8_t low_bits;
636

    
637
        res_setup->type=get_bits(gb, 16);
638

    
639
        AV_DEBUG(" %d. residue type %d \n", i, res_setup->type);
640

    
641
        res_setup->begin=get_bits(gb, 24);
642
        res_setup->end=get_bits(gb, 24);
643
        res_setup->partition_size=get_bits(gb, 24)+1;
644
        res_setup->classifications=get_bits(gb, 6)+1;
645
        res_setup->classbook=get_bits(gb, 8);
646

    
647
        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,
648
          res_setup->classifications, res_setup->classbook);
649

    
650
        for(j=0;j<res_setup->classifications;++j) {
651
            high_bits=0;
652
            low_bits=get_bits(gb, 3);
653
            if (get_bits1(gb)) {
654
                high_bits=get_bits(gb, 5);
655
            }
656
            cascade[j]=(high_bits<<3)+low_bits;
657

    
658
            AV_DEBUG("     %d class casscade depth: %d \n", j, ilog(cascade[j]));
659
        }
660

    
661
        res_setup->maxpass=0;
662
        for(j=0;j<res_setup->classifications;++j) {
663
            for(k=0;k<8;++k) {
664
                if (cascade[j]&(1<<k)) {
665
                        res_setup->books[j][k]=get_bits(gb, 8);
666

    
667
                    AV_DEBUG("     %d class casscade depth %d book: %d \n", j, k, res_setup->books[j][k]);
668

    
669
                    if (k>res_setup->maxpass) {
670
                        res_setup->maxpass=k;
671
                    }
672
                } else {
673
                    res_setup->books[j][k]=-1;
674
                }
675
            }
676
        }
677
    }
678
    return 0;
679
}
680

    
681
// Process mappings part
682

    
683
static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc) {
684
    GetBitContext *gb=&vc->gb;
685
    uint_fast8_t i, j;
686

    
687
    vc->mapping_count=get_bits(gb, 6)+1;
688
    vc->mappings=(vorbis_mapping *)av_mallocz(vc->mapping_count * sizeof(vorbis_mapping));
689

    
690
    AV_DEBUG(" There are %d mappings. \n", vc->mapping_count);
691

    
692
    for(i=0;i<vc->mapping_count;++i) {
693
        vorbis_mapping *mapping_setup=&vc->mappings[i];
694

    
695
        if (get_bits(gb, 16)) {
696
            av_log(vc->avccontext, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n");
697
            return 1;
698
        }
699
        if (get_bits1(gb)) {
700
            mapping_setup->submaps=get_bits(gb, 4)+1;
701
        } else {
702
            mapping_setup->submaps=1;
703
        }
704

    
705
        if (get_bits1(gb)) {
706
            mapping_setup->coupling_steps=get_bits(gb, 8)+1;
707
            mapping_setup->magnitude=(uint_fast8_t *)av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
708
            mapping_setup->angle=(uint_fast8_t *)av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
709
            for(j=0;j<mapping_setup->coupling_steps;++j) {
710
                mapping_setup->magnitude[j]=get_bits(gb, ilog(vc->audio_channels-1));
711
                mapping_setup->angle[j]=get_bits(gb, ilog(vc->audio_channels-1));
712
                // FIXME: sanity checks
713
            }
714
        } else {
715
            mapping_setup->coupling_steps=0;
716
        }
717

    
718
        AV_DEBUG("   %d mapping coupling steps: %d \n", i, mapping_setup->coupling_steps);
719

    
720
        if(get_bits(gb, 2)) {
721
            av_log(vc->avccontext, AV_LOG_ERROR, "%d. mapping setup data invalid. \n", i);
722
            return 1; // following spec.
723
        }
724

    
725
        if (mapping_setup->submaps>1) {
726
            mapping_setup->mux=(uint_fast8_t *)av_mallocz(vc->audio_channels * sizeof(uint_fast8_t));
727
            for(j=0;j<vc->audio_channels;++j) {
728
                mapping_setup->mux[j]=get_bits(gb, 4);
729
            }
730
        }
731

    
732
        for(j=0;j<mapping_setup->submaps;++j) {
733
            get_bits(gb, 8); // FIXME check?
734
            mapping_setup->submap_floor[j]=get_bits(gb, 8);
735
            mapping_setup->submap_residue[j]=get_bits(gb, 8);
736

    
737
            AV_DEBUG("   %d mapping %d submap : floor %d, residue %d \n", i, j, mapping_setup->submap_floor[j], mapping_setup->submap_residue[j]);
738
        }
739
    }
740
    return 0;
741
}
742

    
743
// Process modes part
744

    
745
static void create_map( vorbis_context * vc, uint_fast8_t floor_number )
746
{
747
    vorbis_floor * floors=vc->floors;
748
    vorbis_floor0 * vf;
749
    int idx;
750
    int_fast8_t blockflag;
751
    int_fast32_t * map;
752
    int_fast32_t n; //TODO: could theoretically be smaller?
753

    
754
    for (blockflag=0;blockflag<2;++blockflag)
755
    {
756
    n=vc->blocksize[blockflag]/2;
757
    floors[floor_number].data.t0.map[blockflag]=
758
        av_malloc((n+1) * sizeof(int_fast32_t)); // n+sentinel
759

    
760
    map=floors[floor_number].data.t0.map[blockflag];
761
    vf=&floors[floor_number].data.t0;
762

    
763
    for (idx=0; idx<n;++idx) {
764
        map[idx]=floor( BARK((vf->rate*idx)/(2.0f*n)) *
765
                              ((vf->bark_map_size)/
766
                               BARK(vf->rate/2.0f )) );
767
        if (vf->bark_map_size-1 < map[idx]) {
768
            map[idx]=vf->bark_map_size-1;
769
        }
770
    }
771
    map[n]=-1;
772
    vf->map_size[blockflag]=n;
773
    }
774

    
775
#   ifdef V_DEBUG
776
    for(idx=0;idx<=n;++idx) {
777
        AV_DEBUG("floor0 map: map at pos %d is %d\n",
778
                 idx, map[idx]);
779
    }
780
#   endif
781
}
782

    
783
static int vorbis_parse_setup_hdr_modes(vorbis_context *vc) {
784
    GetBitContext *gb=&vc->gb;
785
    uint_fast8_t i;
786

    
787
    vc->mode_count=get_bits(gb, 6)+1;
788
    vc->modes=(vorbis_mode *)av_mallocz(vc->mode_count * sizeof(vorbis_mode));
789

    
790
    AV_DEBUG(" There are %d modes.\n", vc->mode_count);
791

    
792
    for(i=0;i<vc->mode_count;++i) {
793
        vorbis_mode *mode_setup=&vc->modes[i];
794

    
795
        mode_setup->blockflag=get_bits(gb, 1);
796
        mode_setup->windowtype=get_bits(gb, 16); //FIXME check
797
        mode_setup->transformtype=get_bits(gb, 16); //FIXME check
798
        mode_setup->mapping=get_bits(gb, 8); //FIXME check
799

    
800
        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);
801
    }
802
    return 0;
803
}
804

    
805
// Process the whole setup header using the functions above
806

    
807
static int vorbis_parse_setup_hdr(vorbis_context *vc) {
808
    GetBitContext *gb=&vc->gb;
809

    
810
    if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') ||
811
    (get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') ||
812
    (get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) {
813
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n");
814
        return 1;
815
    }
816

    
817
    if (vorbis_parse_setup_hdr_codebooks(vc)) {
818
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n");
819
        return 2;
820
    }
821
    if (vorbis_parse_setup_hdr_tdtransforms(vc)) {
822
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n");
823
        return 3;
824
    }
825
    if (vorbis_parse_setup_hdr_floors(vc)) {
826
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n");
827
        return 4;
828
    }
829
    if (vorbis_parse_setup_hdr_residues(vc)) {
830
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n");
831
        return 5;
832
    }
833
    if (vorbis_parse_setup_hdr_mappings(vc)) {
834
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n");
835
        return 6;
836
    }
837
    if (vorbis_parse_setup_hdr_modes(vc)) {
838
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n");
839
        return 7;
840
    }
841
    if (!get_bits1(gb)) {
842
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n");
843
        return 8; // framing flag bit unset error
844
    }
845

    
846
    return 0;
847
}
848

    
849
// Process the identification header
850

    
851
static int vorbis_parse_id_hdr(vorbis_context *vc){
852
    GetBitContext *gb=&vc->gb;
853
    uint_fast8_t bl0, bl1;
854

    
855
    if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') ||
856
    (get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') ||
857
    (get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) {
858
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n");
859
        return 1;
860
    }
861

    
862
    vc->version=get_bits_long(gb, 32);    //FIXME check 0
863
    vc->audio_channels=get_bits(gb, 8);   //FIXME check >0
864
    vc->audio_samplerate=get_bits_long(gb, 32);   //FIXME check >0
865
    vc->bitrate_maximum=get_bits_long(gb, 32);
866
    vc->bitrate_nominal=get_bits_long(gb, 32);
867
    vc->bitrate_minimum=get_bits_long(gb, 32);
868
    bl0=get_bits(gb, 4);
869
    bl1=get_bits(gb, 4);
870
    vc->blocksize[0]=(1<<bl0);
871
    vc->blocksize[1]=(1<<bl1);
872
    if (bl0>13 || bl0<6 || bl1>13 || bl1<6 || bl1<bl0) {
873
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n");
874
        return 3;
875
    }
876
    // output format int16
877
    if (vc->blocksize[1]/2 * vc->audio_channels * 2 >
878
                                             AVCODEC_MAX_AUDIO_FRAME_SIZE) {
879
        av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis channel count makes "
880
               "output packets too large.\n");
881
        return 4;
882
    }
883
    vc->win[0]=ff_vorbis_vwin[bl0-6];
884
    vc->win[1]=ff_vorbis_vwin[bl1-6];
885

    
886
    if(vc->exp_bias){
887
        int i, j;
888
        for(j=0; j<2; j++){
889
            float *win = av_malloc(vc->blocksize[j]/2 * sizeof(float));
890
            for(i=0; i<vc->blocksize[j]/2; i++)
891
                win[i] = vc->win[j][i] * (1<<15);
892
            vc->win[j] = win;
893
        }
894
    }
895

    
896
    if ((get_bits1(gb)) == 0) {
897
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n");
898
        return 2;
899
    }
900

    
901
    vc->channel_residues=(float *)av_malloc((vc->blocksize[1]/2)*vc->audio_channels * sizeof(float));
902
    vc->channel_floors=(float *)av_malloc((vc->blocksize[1]/2)*vc->audio_channels * sizeof(float));
903
    vc->saved=(float *)av_malloc((vc->blocksize[1]/2)*vc->audio_channels * sizeof(float));
904
    vc->ret=(float *)av_malloc((vc->blocksize[1]/2)*vc->audio_channels * sizeof(float));
905
    vc->buf=(float *)av_malloc(vc->blocksize[1] * sizeof(float));
906
    vc->buf_tmp=(float *)av_malloc(vc->blocksize[1] * sizeof(float));
907
    vc->saved_start=0;
908

    
909
    ff_mdct_init(&vc->mdct[0], bl0, 1);
910
    ff_mdct_init(&vc->mdct[1], bl1, 1);
911

    
912
    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 ",
913
            vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize[0], vc->blocksize[1]);
914

    
915
/*
916
    BLK=vc->blocksize[0];
917
    for(i=0;i<BLK/2;++i) {
918
        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)));
919
    }
920
*/
921

    
922
    return 0;
923
}
924

    
925
// Process the extradata using the functions above (identification header, setup header)
926

    
927
static int vorbis_decode_init(AVCodecContext *avccontext) {
928
    vorbis_context *vc = avccontext->priv_data ;
929
    uint8_t *headers = avccontext->extradata;
930
    int headers_len=avccontext->extradata_size;
931
    uint8_t *header_start[3];
932
    int header_len[3];
933
    GetBitContext *gb = &(vc->gb);
934
    int hdr_type;
935

    
936
    vc->avccontext = avccontext;
937
    dsputil_init(&vc->dsp, avccontext);
938

    
939
    if(vc->dsp.float_to_int16 == ff_float_to_int16_c) {
940
        vc->add_bias = 385;
941
        vc->exp_bias = 0;
942
    } else {
943
        vc->add_bias = 0;
944
        vc->exp_bias = 15<<23;
945
    }
946

    
947
    if (!headers_len) {
948
        av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
949
        return -1;
950
    }
951

    
952
    if (ff_split_xiph_headers(headers, headers_len, 30, header_start, header_len) < 0) {
953
        av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
954
        return -1;
955
    }
956

    
957
    init_get_bits(gb, header_start[0], header_len[0]*8);
958
    hdr_type=get_bits(gb, 8);
959
    if (hdr_type!=1) {
960
        av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n");
961
        return -1;
962
    }
963
    if (vorbis_parse_id_hdr(vc)) {
964
        av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n");
965
        vorbis_free(vc);
966
        return -1;
967
    }
968

    
969
    init_get_bits(gb, header_start[2], header_len[2]*8);
970
    hdr_type=get_bits(gb, 8);
971
    if (hdr_type!=5) {
972
        av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");
973
        return -1;
974
    }
975
    if (vorbis_parse_setup_hdr(vc)) {
976
        av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");
977
        vorbis_free(vc);
978
        return -1;
979
    }
980

    
981
    avccontext->channels = vc->audio_channels;
982
    avccontext->sample_rate = vc->audio_samplerate;
983

    
984
    return 0 ;
985
}
986

    
987
// Decode audiopackets -------------------------------------------------
988

    
989
// Read and decode floor
990

    
991
static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,
992
                                         vorbis_floor_data *vfu, float *vec) {
993
    vorbis_floor0 * vf=&vfu->t0;
994
    float * lsp=vf->lsp;
995
    uint_fast32_t amplitude;
996
    uint_fast32_t book_idx;
997
    uint_fast8_t blockflag=vc->modes[vc->mode_number].blockflag;
998

    
999
    amplitude=get_bits(&vc->gb, vf->amplitude_bits);
1000
    if (amplitude>0) {
1001
        float last = 0;
1002
        uint_fast16_t lsp_len = 0;
1003
        uint_fast16_t idx;
1004
        vorbis_codebook codebook;
1005

    
1006
        book_idx=get_bits(&vc->gb, ilog(vf->num_books));
1007
        if ( book_idx >= vf->num_books ) {
1008
            av_log( vc->avccontext, AV_LOG_ERROR,
1009
                    "floor0 dec: booknumber too high!\n" );
1010
            //FIXME: look above
1011
        }
1012
        AV_DEBUG( "floor0 dec: booknumber: %u\n", book_idx );
1013
        codebook=vc->codebooks[vf->book_list[book_idx]];
1014

    
1015
        while (lsp_len<vf->order) {
1016
            int vec_off;
1017

    
1018
            AV_DEBUG( "floor0 dec: book dimension: %d\n", codebook.dimensions );
1019
            AV_DEBUG( "floor0 dec: maximum depth: %d\n", codebook.maxdepth );
1020
            /* read temp vector */
1021
            vec_off=get_vlc2(&vc->gb,
1022
                             codebook.vlc.table,
1023
                             codebook.nb_bits,
1024
                             codebook.maxdepth ) *
1025
                             codebook.dimensions;
1026
            AV_DEBUG( "floor0 dec: vector offset: %d\n", vec_off );
1027
            /* copy each vector component and add last to it */
1028
            for (idx=0; idx<codebook.dimensions; ++idx) {
1029
                lsp[lsp_len+idx]=codebook.codevectors[vec_off+idx]+last;
1030
            }
1031
            last=lsp[lsp_len+idx-1]; /* set last to last vector component */
1032

    
1033
            lsp_len += codebook.dimensions;
1034
        }
1035
#ifdef V_DEBUG
1036
        /* DEBUG: output lsp coeffs */
1037
        {
1038
            int idx;
1039
            for ( idx = 0; idx < lsp_len; ++idx )
1040
                AV_DEBUG("floor0 dec: coeff at %d is %f\n", idx, lsp[idx] );
1041
        }
1042
#endif
1043

    
1044
        /* synthesize floor output vector */
1045
        {
1046
            int i;
1047
            int order=vf->order;
1048
            float wstep=M_PI/vf->bark_map_size;
1049

    
1050
            for(i=0;i<order;i++) { lsp[i]=2.0f*cos(lsp[i]); }
1051

    
1052
            AV_DEBUG("floor0 synth: map_size=%d; m=%d; wstep=%f\n",
1053
                     vf->map_size, order, wstep);
1054

    
1055
            i=0;
1056
            while(i<vf->map_size[blockflag]) {
1057
                int j, iter_cond=vf->map[blockflag][i];
1058
                float p=0.5f;
1059
                float q=0.5f;
1060
                float two_cos_w=2.0f*cos(wstep*iter_cond); // needed all times
1061

    
1062
                /* similar part for the q and p products */
1063
                for(j=0;j<order;j+=2) {
1064
                    q *= lsp[j]  -two_cos_w;
1065
                    p *= lsp[j+1]-two_cos_w;
1066
                }
1067
                if(j==order) { // even order
1068
                    p *= p*(2.0f-two_cos_w);
1069
                    q *= q*(2.0f+two_cos_w);
1070
                }
1071
                else { // odd order
1072
                    q *= two_cos_w-lsp[j]; // one more time for q
1073

    
1074
                    /* final step and square */
1075
                    p *= p*(4.f-two_cos_w*two_cos_w);
1076
                    q *= q;
1077
                }
1078

    
1079
                /* calculate linear floor value */
1080
                {
1081
                    q=exp( (
1082
                             ( (amplitude*vf->amplitude_offset)/
1083
                               (((1<<vf->amplitude_bits)-1) * sqrt(p+q)) )
1084
                             - vf->amplitude_offset ) * .11512925f
1085
                         );
1086
                }
1087

    
1088
                /* fill vector */
1089
                do { vec[i]=q; ++i; }while(vf->map[blockflag][i]==iter_cond);
1090
            }
1091
        }
1092
    }
1093
    else {
1094
        /* this channel is unused */
1095
        return 1;
1096
    }
1097

    
1098
    AV_DEBUG(" Floor0 decoded\n");
1099

    
1100
    return 0;
1101
}
1102

    
1103
static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc, vorbis_floor_data *vfu, float *vec) {
1104
    vorbis_floor1 * vf=&vfu->t1;
1105
    GetBitContext *gb=&vc->gb;
1106
    uint_fast16_t range_v[4]={ 256, 128, 86, 64 };
1107
    uint_fast16_t range=range_v[vf->multiplier-1];
1108
    uint_fast16_t floor1_Y[vf->x_list_dim];
1109
    uint_fast16_t floor1_Y_final[vf->x_list_dim];
1110
    int floor1_flag[vf->x_list_dim];
1111
    uint_fast8_t class_;
1112
    uint_fast8_t cdim;
1113
    uint_fast8_t cbits;
1114
    uint_fast8_t csub;
1115
    uint_fast8_t cval;
1116
    int_fast16_t book;
1117
    uint_fast16_t offset;
1118
    uint_fast16_t i,j;
1119
    /*u*/int_fast16_t adx, ady, off, predicted; // WTF ? dy/adx= (unsigned)dy/adx ?
1120
    int_fast16_t dy, err;
1121

    
1122

    
1123
    if (!get_bits1(gb)) return 1; // silence
1124

    
1125
// Read values (or differences) for the floor's points
1126

    
1127
    floor1_Y[0]=get_bits(gb, ilog(range-1));
1128
    floor1_Y[1]=get_bits(gb, ilog(range-1));
1129

    
1130
    AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);
1131

    
1132
    offset=2;
1133
    for(i=0;i<vf->partitions;++i) {
1134
        class_=vf->partition_class[i];
1135
        cdim=vf->class_dimensions[class_];
1136
        cbits=vf->class_subclasses[class_];
1137
        csub=(1<<cbits)-1;
1138
        cval=0;
1139

    
1140
        AV_DEBUG("Cbits %d \n", cbits);
1141

    
1142
        if (cbits) { // this reads all subclasses for this partition's class
1143
            cval=get_vlc2(gb, vc->codebooks[vf->class_masterbook[class_]].vlc.table,
1144
            vc->codebooks[vf->class_masterbook[class_]].nb_bits, 3);
1145
        }
1146

    
1147
        for(j=0;j<cdim;++j) {
1148
            book=vf->subclass_books[class_][cval & csub];
1149

    
1150
            AV_DEBUG("book %d Cbits %d cval %d  bits:%d \n", book, cbits, cval, get_bits_count(gb));
1151

    
1152
            cval=cval>>cbits;
1153
            if (book>-1) {
1154
                floor1_Y[offset+j]=get_vlc2(gb, vc->codebooks[book].vlc.table,
1155
                vc->codebooks[book].nb_bits, 3);
1156
            } else {
1157
                floor1_Y[offset+j]=0;
1158
            }
1159

    
1160
            AV_DEBUG(" floor(%d) = %d \n", vf->list[offset+j].x, floor1_Y[offset+j]);
1161
        }
1162
        offset+=cdim;
1163
    }
1164

    
1165
// Amplitude calculation from the differences
1166

    
1167
    floor1_flag[0]=1;
1168
    floor1_flag[1]=1;
1169
    floor1_Y_final[0]=floor1_Y[0];
1170
    floor1_Y_final[1]=floor1_Y[1];
1171

    
1172
    for(i=2;i<vf->x_list_dim;++i) {
1173
        uint_fast16_t val, highroom, lowroom, room;
1174
        uint_fast16_t high_neigh_offs;
1175
        uint_fast16_t low_neigh_offs;
1176

    
1177
        low_neigh_offs=vf->list[i].low;
1178
        high_neigh_offs=vf->list[i].high;
1179
        dy=floor1_Y_final[high_neigh_offs]-floor1_Y_final[low_neigh_offs];  // render_point begin
1180
        adx=vf->list[high_neigh_offs].x-vf->list[low_neigh_offs].x;
1181
        ady= FFABS(dy);
1182
        err=ady*(vf->list[i].x-vf->list[low_neigh_offs].x);
1183
        off=(int16_t)err/(int16_t)adx;
1184
        if (dy<0) {
1185
            predicted=floor1_Y_final[low_neigh_offs]-off;
1186
        } else {
1187
            predicted=floor1_Y_final[low_neigh_offs]+off;
1188
        } // render_point end
1189

    
1190
        val=floor1_Y[i];
1191
        highroom=range-predicted;
1192
        lowroom=predicted;
1193
        if (highroom < lowroom) {
1194
            room=highroom*2;
1195
        } else {
1196
            room=lowroom*2;   // SPEC mispelling
1197
        }
1198
        if (val) {
1199
            floor1_flag[low_neigh_offs]=1;
1200
            floor1_flag[high_neigh_offs]=1;
1201
            floor1_flag[i]=1;
1202
            if (val>=room) {
1203
                if (highroom > lowroom) {
1204
                    floor1_Y_final[i]=val-lowroom+predicted;
1205
                } else {
1206
                    floor1_Y_final[i]=predicted-val+highroom-1;
1207
                }
1208
            } else {
1209
                if (val & 1) {
1210
                    floor1_Y_final[i]=predicted-(val+1)/2;
1211
                } else {
1212
                    floor1_Y_final[i]=predicted+val/2;
1213
                }
1214
            }
1215
        } else {
1216
            floor1_flag[i]=0;
1217
            floor1_Y_final[i]=predicted;
1218
        }
1219

    
1220
        AV_DEBUG(" Decoded floor(%d) = %d / val %d \n", vf->list[i].x, floor1_Y_final[i], val);
1221
    }
1222

    
1223
// Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?
1224

    
1225
    ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);
1226

    
1227
    AV_DEBUG(" Floor decoded\n");
1228

    
1229
    return 0;
1230
}
1231

    
1232
// Read and decode residue
1233

    
1234
static 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) {
1235
    GetBitContext *gb=&vc->gb;
1236
    uint_fast8_t c_p_c=vc->codebooks[vr->classbook].dimensions;
1237
    uint_fast16_t n_to_read=vr->end-vr->begin;
1238
    uint_fast16_t ptns_to_read=n_to_read/vr->partition_size;
1239
    uint_fast8_t classifs[ptns_to_read*vc->audio_channels];
1240
    uint_fast8_t pass;
1241
    uint_fast8_t ch_used;
1242
    uint_fast8_t i,j,l;
1243
    uint_fast16_t k;
1244

    
1245
    if (vr->type==2) {
1246
        for(j=1;j<ch;++j) {
1247
                do_not_decode[0]&=do_not_decode[j];  // FIXME - clobbering input
1248
        }
1249
        if (do_not_decode[0]) return 0;
1250
        ch_used=1;
1251
    } else {
1252
        ch_used=ch;
1253
    }
1254

    
1255
    AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);
1256

    
1257
    for(pass=0;pass<=vr->maxpass;++pass) { // FIXME OPTIMIZE?
1258
        uint_fast16_t voffset;
1259
        uint_fast16_t partition_count;
1260
        uint_fast16_t j_times_ptns_to_read;
1261

    
1262
        voffset=vr->begin;
1263
        for(partition_count=0;partition_count<ptns_to_read;) {  // SPEC        error
1264
            if (!pass) {
1265
                uint_fast32_t inverse_class = ff_inverse[vr->classifications];
1266
                for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {
1267
                    if (!do_not_decode[j]) {
1268
                        uint_fast32_t temp=get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,
1269
                        vc->codebooks[vr->classbook].nb_bits, 3);
1270

    
1271
                        AV_DEBUG("Classword: %d \n", temp);
1272

    
1273
                        assert(vr->classifications > 1 && temp<=65536); //needed for inverse[]
1274
                        for(i=0;i<c_p_c;++i) {
1275
                            uint_fast32_t temp2;
1276

    
1277
                            temp2=(((uint_fast64_t)temp) * inverse_class)>>32;
1278
                            if (partition_count+c_p_c-1-i < ptns_to_read) {
1279
                                classifs[j_times_ptns_to_read+partition_count+c_p_c-1-i]=temp-temp2*vr->classifications;
1280
                            }
1281
                            temp=temp2;
1282
                        }
1283
                    }
1284
                    j_times_ptns_to_read+=ptns_to_read;
1285
                }
1286
            }
1287
            for(i=0;(i<c_p_c) && (partition_count<ptns_to_read);++i) {
1288
                for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {
1289
                    uint_fast16_t voffs;
1290

    
1291
                    if (!do_not_decode[j]) {
1292
                        uint_fast8_t vqclass=classifs[j_times_ptns_to_read+partition_count];
1293
                        int_fast16_t vqbook=vr->books[vqclass][pass];
1294

    
1295
                        if (vqbook>=0) {
1296
                            uint_fast16_t coffs;
1297
                            unsigned dim= vc->codebooks[vqbook].dimensions; // not uint_fast8_t: 64bit is slower here on amd64
1298
                            uint_fast16_t step= dim==1 ? vr->partition_size
1299
                                              : FASTDIV(vr->partition_size, dim);
1300
                            vorbis_codebook codebook= vc->codebooks[vqbook];
1301

    
1302
                            if (vr->type==0) {
1303

    
1304
                                voffs=voffset+j*vlen;
1305
                                for(k=0;k<step;++k) {
1306
                                    coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1307
                                    for(l=0;l<dim;++l) {
1308
                                        vec[voffs+k+l*step]+=codebook.codevectors[coffs+l];  // FPMATH
1309
                                    }
1310
                                }
1311
                            }
1312
                            else if (vr->type==1) {
1313
                                voffs=voffset+j*vlen;
1314
                                for(k=0;k<step;++k) {
1315
                                    coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1316
                                    for(l=0;l<dim;++l, ++voffs) {
1317
                                        vec[voffs]+=codebook.codevectors[coffs+l];  // FPMATH
1318

    
1319
                                        AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d  \n", pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);
1320
                                    }
1321
                                }
1322
                            }
1323
                            else if (vr->type==2 && ch==2 && (voffset&1)==0 && (dim&1)==0) { // most frequent case optimized
1324
                                voffs=voffset>>1;
1325

    
1326
                                if(dim==2) {
1327
                                    for(k=0;k<step;++k) {
1328
                                        coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;
1329
                                        vec[voffs+k     ]+=codebook.codevectors[coffs  ];  // FPMATH
1330
                                        vec[voffs+k+vlen]+=codebook.codevectors[coffs+1];  // FPMATH
1331
                                    }
1332
                                } else
1333
                                for(k=0;k<step;++k) {
1334
                                    coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1335
                                    for(l=0;l<dim;l+=2, voffs++) {
1336
                                        vec[voffs     ]+=codebook.codevectors[coffs+l  ];  // FPMATH
1337
                                        vec[voffs+vlen]+=codebook.codevectors[coffs+l+1];  // FPMATH
1338

    
1339
                                        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);
1340
                                    }
1341
                                }
1342

    
1343
                            }
1344
                            else if (vr->type==2) {
1345
                                voffs=voffset;
1346

    
1347
                                for(k=0;k<step;++k) {
1348
                                    coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1349
                                    for(l=0;l<dim;++l, ++voffs) {
1350
                                        vec[voffs/ch+(voffs%ch)*vlen]+=codebook.codevectors[coffs+l];  // FPMATH FIXME use if and counter instead of / and %
1351

    
1352
                                        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);
1353
                                    }
1354
                                }
1355
                            } else {
1356
                                av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");
1357
                                return 1;
1358
                            }
1359
                        }
1360
                    }
1361
                    j_times_ptns_to_read+=ptns_to_read;
1362
                }
1363
                ++partition_count;
1364
                voffset+=vr->partition_size;
1365
            }
1366
        }
1367
    }
1368
    return 0;
1369
}
1370

    
1371
void vorbis_inverse_coupling(float *mag, float *ang, int blocksize)
1372
{
1373
    int i;
1374
    for(i=0; i<blocksize; i++)
1375
    {
1376
        if (mag[i]>0.0) {
1377
            if (ang[i]>0.0) {
1378
                ang[i]=mag[i]-ang[i];
1379
            } else {
1380
                float temp=ang[i];
1381
                ang[i]=mag[i];
1382
                mag[i]+=temp;
1383
            }
1384
        } else {
1385
            if (ang[i]>0.0) {
1386
                ang[i]+=mag[i];
1387
            } else {
1388
                float temp=ang[i];
1389
                ang[i]=mag[i];
1390
                mag[i]-=temp;
1391
            }
1392
        }
1393
    }
1394
}
1395

    
1396
// Decode the audio packet using the functions above
1397

    
1398
static int vorbis_parse_audio_packet(vorbis_context *vc) {
1399
    GetBitContext *gb=&vc->gb;
1400

    
1401
    uint_fast8_t previous_window=0,next_window=0;
1402
    uint_fast8_t mode_number;
1403
    uint_fast16_t blocksize;
1404
    int_fast32_t i,j;
1405
    uint_fast8_t no_residue[vc->audio_channels];
1406
    uint_fast8_t do_not_decode[vc->audio_channels];
1407
    vorbis_mapping *mapping;
1408
    float *ch_res_ptr=vc->channel_residues;
1409
    float *ch_floor_ptr=vc->channel_floors;
1410
    uint_fast8_t res_chan[vc->audio_channels];
1411
    uint_fast8_t res_num=0;
1412
    int_fast16_t retlen=0;
1413
    uint_fast16_t saved_start=0;
1414
    float fadd_bias = vc->add_bias;
1415

    
1416
    if (get_bits1(gb)) {
1417
        av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");
1418
        return -1; // packet type not audio
1419
    }
1420

    
1421
    if (vc->mode_count==1) {
1422
        mode_number=0;
1423
    } else {
1424
        mode_number=get_bits(gb, ilog(vc->mode_count-1));
1425
    }
1426
    vc->mode_number=mode_number;
1427
    mapping=&vc->mappings[vc->modes[mode_number].mapping];
1428

    
1429
    AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);
1430

    
1431
    if (vc->modes[mode_number].blockflag) {
1432
        previous_window=get_bits1(gb);
1433
        next_window=get_bits1(gb);
1434
    }
1435

    
1436
    blocksize=vc->blocksize[vc->modes[mode_number].blockflag];
1437
    memset(ch_res_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?
1438
    memset(ch_floor_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?
1439

    
1440
// Decode floor
1441

    
1442
    for(i=0;i<vc->audio_channels;++i) {
1443
        vorbis_floor *floor;
1444
        if (mapping->submaps>1) {
1445
            floor=&vc->floors[mapping->submap_floor[mapping->mux[i]]];
1446
        } else {
1447
            floor=&vc->floors[mapping->submap_floor[0]];
1448
        }
1449

    
1450
        no_residue[i]=floor->decode(vc, &floor->data, ch_floor_ptr);
1451
        ch_floor_ptr+=blocksize/2;
1452
    }
1453

    
1454
// Nonzero vector propagate
1455

    
1456
    for(i=mapping->coupling_steps-1;i>=0;--i) {
1457
        if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {
1458
            no_residue[mapping->magnitude[i]]=0;
1459
            no_residue[mapping->angle[i]]=0;
1460
        }
1461
    }
1462

    
1463
// Decode residue
1464

    
1465
    for(i=0;i<mapping->submaps;++i) {
1466
        vorbis_residue *residue;
1467
        uint_fast8_t ch=0;
1468

    
1469
        for(j=0;j<vc->audio_channels;++j) {
1470
            if ((mapping->submaps==1) || (i=mapping->mux[j])) {
1471
                res_chan[j]=res_num;
1472
                if (no_residue[j]) {
1473
                    do_not_decode[ch]=1;
1474
                } else {
1475
                    do_not_decode[ch]=0;
1476
                }
1477
                ++ch;
1478
                ++res_num;
1479
            }
1480
        }
1481
        residue=&vc->residues[mapping->submap_residue[i]];
1482
        vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);
1483

    
1484
        ch_res_ptr+=ch*blocksize/2;
1485
    }
1486

    
1487
// Inverse coupling
1488

    
1489
    for(i=mapping->coupling_steps-1;i>=0;--i) { //warning: i has to be signed
1490
        float *mag, *ang;
1491

    
1492
        mag=vc->channel_residues+res_chan[mapping->magnitude[i]]*blocksize/2;
1493
        ang=vc->channel_residues+res_chan[mapping->angle[i]]*blocksize/2;
1494
        vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize/2);
1495
    }
1496

    
1497
// Dotproduct
1498

    
1499
    for(j=0, ch_floor_ptr=vc->channel_floors;j<vc->audio_channels;++j,ch_floor_ptr+=blocksize/2) {
1500
        ch_res_ptr=vc->channel_residues+res_chan[j]*blocksize/2;
1501
        vc->dsp.vector_fmul(ch_floor_ptr, ch_res_ptr, blocksize/2);
1502
    }
1503

    
1504
// MDCT, overlap/add, save data for next overlapping  FPMATH
1505

    
1506
    for(j=0;j<vc->audio_channels;++j) {
1507
        uint_fast8_t step=vc->audio_channels;
1508
        uint_fast16_t k;
1509
        float *saved=vc->saved+j*vc->blocksize[1]/2;
1510
        float *ret=vc->ret;
1511
        const float *lwin=vc->win[1];
1512
        const float *swin=vc->win[0];
1513
        float *buf=vc->buf;
1514
        float *buf_tmp=vc->buf_tmp;
1515

    
1516
        ch_floor_ptr=vc->channel_floors+j*blocksize/2;
1517

    
1518
        saved_start=vc->saved_start;
1519

    
1520
        vc->mdct[0].fft.imdct_calc(&vc->mdct[vc->modes[mode_number].blockflag], buf, ch_floor_ptr, buf_tmp);
1521

    
1522
        //FIXME process channels together, to allow faster simd vector_fmul_add_add?
1523
        if (vc->modes[mode_number].blockflag) {
1524
            // -- overlap/add
1525
            if (previous_window) {
1526
                vc->dsp.vector_fmul_add_add(ret+j, buf, lwin, saved, vc->add_bias, vc->blocksize[1]/2, step);
1527
                retlen=vc->blocksize[1]/2;
1528
            } else {
1529
                int len = (vc->blocksize[1]-vc->blocksize[0])/4;
1530
                buf += len;
1531
                vc->dsp.vector_fmul_add_add(ret+j, buf, swin, saved, vc->add_bias, vc->blocksize[0]/2, step);
1532
                k = vc->blocksize[0]/2*step + j;
1533
                buf += vc->blocksize[0]/2;
1534
                if(vc->exp_bias){
1535
                    for(i=0; i<len; i++, k+=step)
1536
                        ((uint32_t*)ret)[k] = ((uint32_t*)buf)[i] + vc->exp_bias; // ret[k]=buf[i]*(1<<bias)
1537
                } else {
1538
                    for(i=0; i<len; i++, k+=step)
1539
                        ret[k] = buf[i] + fadd_bias;
1540
                }
1541
                buf=vc->buf;
1542
                retlen=vc->blocksize[0]/2+len;
1543
            }
1544
            // -- save
1545
            if (next_window) {
1546
                buf += vc->blocksize[1]/2;
1547
                vc->dsp.vector_fmul_reverse(saved, buf, lwin, vc->blocksize[1]/2);
1548
                saved_start=0;
1549
            } else {
1550
                saved_start=(vc->blocksize[1]-vc->blocksize[0])/4;
1551
                buf += vc->blocksize[1]/2;
1552
                for(i=0; i<saved_start; i++)
1553
                    ((uint32_t*)saved)[i] = ((uint32_t*)buf)[i] + vc->exp_bias;
1554
                vc->dsp.vector_fmul_reverse(saved+saved_start, buf+saved_start, swin, vc->blocksize[0]/2);
1555
            }
1556
        } else {
1557
            // --overlap/add
1558
            if(vc->add_bias) {
1559
                for(k=j, i=0;i<saved_start;++i, k+=step)
1560
                    ret[k] = saved[i] + fadd_bias;
1561
            } else {
1562
                for(k=j, i=0;i<saved_start;++i, k+=step)
1563
                    ret[k] = saved[i];
1564
            }
1565
            vc->dsp.vector_fmul_add_add(ret+k, buf, swin, saved+saved_start, vc->add_bias, vc->blocksize[0]/2, step);
1566
            retlen=saved_start+vc->blocksize[0]/2;
1567
            // -- save
1568
            buf += vc->blocksize[0]/2;
1569
            vc->dsp.vector_fmul_reverse(saved, buf, swin, vc->blocksize[0]/2);
1570
            saved_start=0;
1571
        }
1572
    }
1573
    vc->saved_start=saved_start;
1574

    
1575
    return retlen*vc->audio_channels;
1576
}
1577

    
1578
// Return the decoded audio packet through the standard api
1579

    
1580
static int vorbis_decode_frame(AVCodecContext *avccontext,
1581
                        void *data, int *data_size,
1582
                        uint8_t *buf, int buf_size)
1583
{
1584
    vorbis_context *vc = avccontext->priv_data ;
1585
    GetBitContext *gb = &(vc->gb);
1586

    
1587
    int_fast16_t len;
1588

    
1589
    if(!buf_size){
1590
        return 0;
1591
    }
1592

    
1593
    AV_DEBUG("packet length %d \n", buf_size);
1594

    
1595
    init_get_bits(gb, buf, buf_size*8);
1596

    
1597
    len=vorbis_parse_audio_packet(vc);
1598

    
1599
    if (len<=0) {
1600
        *data_size=0;
1601
        return buf_size;
1602
    }
1603

    
1604
    if (!vc->first_frame) {
1605
        vc->first_frame=1;
1606
        *data_size=0;
1607
        return buf_size ;
1608
    }
1609

    
1610
    AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);
1611

    
1612
    vc->dsp.float_to_int16(data, vc->ret, len);
1613
    *data_size=len*2;
1614

    
1615
    return buf_size ;
1616
}
1617

    
1618
// Close decoder
1619

    
1620
static int vorbis_decode_close(AVCodecContext *avccontext) {
1621
    vorbis_context *vc = avccontext->priv_data;
1622

    
1623
    vorbis_free(vc);
1624

    
1625
    return 0 ;
1626
}
1627

    
1628
AVCodec vorbis_decoder = {
1629
    "vorbis",
1630
    CODEC_TYPE_AUDIO,
1631
    CODEC_ID_VORBIS,
1632
    sizeof(vorbis_context),
1633
    vorbis_decode_init,
1634
    NULL,
1635
    vorbis_decode_close,
1636
    vorbis_decode_frame,
1637
};
1638