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ffmpeg / libavcodec / vorbis_dec.c @ aedc98b0

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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
16
 * Lesser General Public License for more details.
17
 *
18
 * You should have received a copy of the GNU Lesser General Public
19
 * License along with FFmpeg; if not, write to the Free Software
20
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21
 */
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
#define V_MAX_PARTITIONS (1<<20)
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;
59
typedef struct vorbis_floor0_s vorbis_floor0;
60
typedef struct vorbis_floor1_s vorbis_floor1;
61
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;
67
    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;
73
            uint_fast16_t rate;
74
            uint_fast16_t bark_map_size;
75
            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;
94
            vorbis_floor1_entry * 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;
115
    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
    FFTContext 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
    uint_fast8_t previous_window;
154
    float *channel_residues;
155
    float *channel_floors;
156
    float *saved;
157
    uint_fast32_t add_bias; // for float->int conversion
158
    uint_fast32_t exp_bias;
159
} vorbis_context;
160

    
161
/* Helper functions */
162

    
163
#define BARK(x) \
164
    (13.1f*atan(0.00074f*(x))+2.24f*atan(1.85e-8f*(x)*(x))+1e-4f*(x))
165

    
166
static float vorbisfloat2float(uint_fast32_t val) {
167
    double mant=val&0x1fffff;
168
    long exp=(val&0x7fe00000L)>>21;
169
    if (val&0x80000000) mant=-mant;
170
    return ldexp(mant, exp - 20 - 768);
171
}
172

    
173

    
174
// Free all allocated memory -----------------------------------------
175

    
176
static void vorbis_free(vorbis_context *vc) {
177
    int_fast16_t i;
178

    
179
    av_freep(&vc->channel_residues);
180
    av_freep(&vc->channel_floors);
181
    av_freep(&vc->saved);
182

    
183
    av_freep(&vc->residues);
184
    av_freep(&vc->modes);
185

    
186
    ff_mdct_end(&vc->mdct[0]);
187
    ff_mdct_end(&vc->mdct[1]);
188

    
189
    for(i=0;i<vc->codebook_count;++i) {
190
        av_free(vc->codebooks[i].codevectors);
191
        free_vlc(&vc->codebooks[i].vlc);
192
    }
193
    av_freep(&vc->codebooks);
194

    
195
    for(i=0;i<vc->floor_count;++i) {
196
        if(vc->floors[i].floor_type==0) {
197
            av_free(vc->floors[i].data.t0.map[0]);
198
            av_free(vc->floors[i].data.t0.map[1]);
199
            av_free(vc->floors[i].data.t0.book_list);
200
            av_free(vc->floors[i].data.t0.lsp);
201
        }
202
        else {
203
            av_free(vc->floors[i].data.t1.list);
204
        }
205
    }
206
    av_freep(&vc->floors);
207

    
208
    for(i=0;i<vc->mapping_count;++i) {
209
        av_free(vc->mappings[i].magnitude);
210
        av_free(vc->mappings[i].angle);
211
        av_free(vc->mappings[i].mux);
212
    }
213
    av_freep(&vc->mappings);
214
}
215

    
216
// Parse setup header -------------------------------------------------
217

    
218
// Process codebooks part
219

    
220
static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc) {
221
    uint_fast16_t cb;
222
    uint8_t *tmp_vlc_bits;
223
    uint32_t *tmp_vlc_codes;
224
    GetBitContext *gb=&vc->gb;
225

    
226
    vc->codebook_count=get_bits(gb,8)+1;
227

    
228
    AV_DEBUG(" Codebooks: %d \n", vc->codebook_count);
229

    
230
    vc->codebooks=av_mallocz(vc->codebook_count * sizeof(vorbis_codebook));
231
    tmp_vlc_bits =av_mallocz(V_MAX_VLCS * sizeof(uint8_t));
232
    tmp_vlc_codes=av_mallocz(V_MAX_VLCS * sizeof(uint32_t));
233

    
234
    for(cb=0;cb<vc->codebook_count;++cb) {
235
        vorbis_codebook *codebook_setup=&vc->codebooks[cb];
236
        uint_fast8_t ordered;
237
        uint_fast32_t t, used_entries=0;
238
        uint_fast32_t entries;
239

    
240
        AV_DEBUG(" %d. Codebook \n", cb);
241

    
242
        if (get_bits(gb, 24)!=0x564342) {
243
            av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook setup data corrupt. \n", cb);
244
            goto error;
245
        }
246

    
247
        codebook_setup->dimensions=get_bits(gb, 16);
248
        if (codebook_setup->dimensions>16||codebook_setup->dimensions==0) {
249
            av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook's dimension is invalid (%d). \n", cb, codebook_setup->dimensions);
250
            goto error;
251
        }
252
        entries=get_bits(gb, 24);
253
        if (entries>V_MAX_VLCS) {
254
            av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook has too many entries (%"PRIdFAST32"). \n", cb, entries);
255
            goto error;
256
        }
257

    
258
        ordered=get_bits1(gb);
259

    
260
        AV_DEBUG(" codebook_dimensions %d, codebook_entries %d \n", codebook_setup->dimensions, entries);
261

    
262
        if (!ordered) {
263
            uint_fast16_t ce;
264
            uint_fast8_t flag;
265
            uint_fast8_t sparse=get_bits1(gb);
266

    
267
            AV_DEBUG(" not ordered \n");
268

    
269
            if (sparse) {
270
                AV_DEBUG(" sparse \n");
271

    
272
                used_entries=0;
273
                for(ce=0;ce<entries;++ce) {
274
                    flag=get_bits1(gb);
275
                    if (flag) {
276
                        tmp_vlc_bits[ce]=get_bits(gb, 5)+1;
277
                        ++used_entries;
278
                    }
279
                    else tmp_vlc_bits[ce]=0;
280
                }
281
            } else {
282
                AV_DEBUG(" not sparse \n");
283

    
284
                used_entries=entries;
285
                for(ce=0;ce<entries;++ce) {
286
                    tmp_vlc_bits[ce]=get_bits(gb, 5)+1;
287
                }
288
            }
289
        } else {
290
            uint_fast16_t current_entry=0;
291
            uint_fast8_t current_length=get_bits(gb, 5)+1;
292

    
293
            AV_DEBUG(" ordered, current length: %d \n", current_length);  //FIXME
294

    
295
            used_entries=entries;
296
            for(;current_entry<used_entries && current_length <= 32;++current_length) {
297
                uint_fast16_t i, number;
298

    
299
                AV_DEBUG(" number bits: %d ", ilog(entries - current_entry));
300

    
301
                number=get_bits(gb, ilog(entries - current_entry));
302

    
303
                AV_DEBUG(" number: %d \n", number);
304

    
305
                for(i=current_entry;i<number+current_entry;++i) {
306
                    if (i<used_entries) tmp_vlc_bits[i]=current_length;
307
                }
308

    
309
                current_entry+=number;
310
            }
311
            if (current_entry>used_entries) {
312
                av_log(vc->avccontext, AV_LOG_ERROR, " More codelengths than codes in codebook. \n");
313
                goto error;
314
            }
315
        }
316

    
317
        codebook_setup->lookup_type=get_bits(gb, 4);
318

    
319
        AV_DEBUG(" lookup type: %d : %s \n", codebook_setup->lookup_type, codebook_setup->lookup_type ? "vq" : "no lookup" );
320

    
321
// If the codebook is used for (inverse) VQ, calculate codevectors.
322

    
323
        if (codebook_setup->lookup_type==1) {
324
            uint_fast16_t i, j, k;
325
            uint_fast16_t codebook_lookup_values=ff_vorbis_nth_root(entries, codebook_setup->dimensions);
326
            uint_fast16_t codebook_multiplicands[codebook_lookup_values];
327

    
328
            float codebook_minimum_value=vorbisfloat2float(get_bits_long(gb, 32));
329
            float codebook_delta_value=vorbisfloat2float(get_bits_long(gb, 32));
330
            uint_fast8_t codebook_value_bits=get_bits(gb, 4)+1;
331
            uint_fast8_t codebook_sequence_p=get_bits1(gb);
332

    
333
            AV_DEBUG(" We expect %d numbers for building the codevectors. \n", codebook_lookup_values);
334
            AV_DEBUG("  delta %f minmum %f \n", codebook_delta_value, codebook_minimum_value);
335

    
336
            for(i=0;i<codebook_lookup_values;++i) {
337
                codebook_multiplicands[i]=get_bits(gb, codebook_value_bits);
338

    
339
                AV_DEBUG(" multiplicands*delta+minmum : %e \n", (float)codebook_multiplicands[i]*codebook_delta_value+codebook_minimum_value);
340
                AV_DEBUG(" multiplicand %d \n", codebook_multiplicands[i]);
341
            }
342

    
343
// Weed out unused vlcs and build codevector vector
344
            codebook_setup->codevectors=used_entries ? av_mallocz(used_entries*codebook_setup->dimensions * sizeof(float)) : NULL;
345
            for(j=0, i=0;i<entries;++i) {
346
                uint_fast8_t dim=codebook_setup->dimensions;
347

    
348
                if (tmp_vlc_bits[i]) {
349
                    float last=0.0;
350
                    uint_fast32_t lookup_offset=i;
351

    
352
#ifdef V_DEBUG
353
                    av_log(vc->avccontext, AV_LOG_INFO, "Lookup offset %d ,", i);
354
#endif
355

    
356
                    for(k=0;k<dim;++k) {
357
                        uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values;
358
                        codebook_setup->codevectors[j*dim+k]=codebook_multiplicands[multiplicand_offset]*codebook_delta_value+codebook_minimum_value+last;
359
                        if (codebook_sequence_p) {
360
                            last=codebook_setup->codevectors[j*dim+k];
361
                        }
362
                        lookup_offset/=codebook_lookup_values;
363
                    }
364
                    tmp_vlc_bits[j]=tmp_vlc_bits[i];
365

    
366
#ifdef V_DEBUG
367
                    av_log(vc->avccontext, AV_LOG_INFO, "real lookup offset %d, vector: ", j);
368
                    for(k=0;k<dim;++k) {
369
                        av_log(vc->avccontext, AV_LOG_INFO, " %f ", codebook_setup->codevectors[j*dim+k]);
370
                    }
371
                    av_log(vc->avccontext, AV_LOG_INFO, "\n");
372
#endif
373

    
374
                    ++j;
375
                }
376
            }
377
            if (j!=used_entries) {
378
                av_log(vc->avccontext, AV_LOG_ERROR, "Bug in codevector vector building code. \n");
379
                goto error;
380
            }
381
            entries=used_entries;
382
        }
383
        else if (codebook_setup->lookup_type>=2) {
384
            av_log(vc->avccontext, AV_LOG_ERROR, "Codebook lookup type not supported. \n");
385
            goto error;
386
        }
387

    
388
// Initialize VLC table
389
        if (ff_vorbis_len2vlc(tmp_vlc_bits, tmp_vlc_codes, entries)) {
390
            av_log(vc->avccontext, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");
391
            goto error;
392
        }
393
        codebook_setup->maxdepth=0;
394
        for(t=0;t<entries;++t)
395
            if (tmp_vlc_bits[t]>=codebook_setup->maxdepth) codebook_setup->maxdepth=tmp_vlc_bits[t];
396

    
397
        if(codebook_setup->maxdepth > 3*V_NB_BITS) codebook_setup->nb_bits=V_NB_BITS2;
398
        else                                       codebook_setup->nb_bits=V_NB_BITS;
399

    
400
        codebook_setup->maxdepth=(codebook_setup->maxdepth+codebook_setup->nb_bits-1)/codebook_setup->nb_bits;
401

    
402
        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)) {
403
            av_log(vc->avccontext, AV_LOG_ERROR, " Error generating vlc tables. \n");
404
            goto error;
405
        }
406
    }
407

    
408
    av_free(tmp_vlc_bits);
409
    av_free(tmp_vlc_codes);
410
    return 0;
411

    
412
// Error:
413
error:
414
    av_free(tmp_vlc_bits);
415
    av_free(tmp_vlc_codes);
416
    return -1;
417
}
418

    
419
// Process time domain transforms part (unused in Vorbis I)
420

    
421
static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc) {
422
    GetBitContext *gb=&vc->gb;
423
    uint_fast8_t i;
424
    uint_fast8_t vorbis_time_count=get_bits(gb, 6)+1;
425

    
426
    for(i=0;i<vorbis_time_count;++i) {
427
        uint_fast16_t vorbis_tdtransform=get_bits(gb, 16);
428

    
429
        AV_DEBUG(" Vorbis time domain transform %d: %d \n", vorbis_time_count, vorbis_tdtransform);
430

    
431
        if (vorbis_tdtransform) {
432
            av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n");
433
            return -1;
434
        }
435
    }
436
    return 0;
437
}
438

    
439
// Process floors part
440

    
441
static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,
442
                                         vorbis_floor_data *vfu, float *vec);
443
static void create_map( vorbis_context * vc, uint_fast8_t floor_number );
444
static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc,
445
                                         vorbis_floor_data *vfu, float *vec);
446
static int vorbis_parse_setup_hdr_floors(vorbis_context *vc) {
447
    GetBitContext *gb=&vc->gb;
448
    uint_fast16_t i,j,k;
449

    
450
    vc->floor_count=get_bits(gb, 6)+1;
451

    
452
    vc->floors=av_mallocz(vc->floor_count * sizeof(vorbis_floor));
453

    
454
    for (i=0;i<vc->floor_count;++i) {
455
        vorbis_floor *floor_setup=&vc->floors[i];
456

    
457
        floor_setup->floor_type=get_bits(gb, 16);
458

    
459
        AV_DEBUG(" %d. floor type %d \n", i, floor_setup->floor_type);
460

    
461
        if (floor_setup->floor_type==1) {
462
            uint_fast8_t maximum_class=0;
463
            uint_fast8_t rangebits;
464
            uint_fast16_t floor1_values=2;
465

    
466
            floor_setup->decode=vorbis_floor1_decode;
467

    
468
            floor_setup->data.t1.partitions=get_bits(gb, 5);
469

    
470
            AV_DEBUG(" %d.floor: %d partitions \n", i, floor_setup->data.t1.partitions);
471

    
472
            for(j=0;j<floor_setup->data.t1.partitions;++j) {
473
                floor_setup->data.t1.partition_class[j]=get_bits(gb, 4);
474
                if (floor_setup->data.t1.partition_class[j]>maximum_class) maximum_class=floor_setup->data.t1.partition_class[j];
475

    
476
                AV_DEBUG(" %d. floor %d partition class %d \n", i, j, floor_setup->data.t1.partition_class[j]);
477

    
478
            }
479

    
480
            AV_DEBUG(" maximum class %d \n", maximum_class);
481

    
482
            floor_setup->data.t1.maximum_class=maximum_class;
483

    
484
            for(j=0;j<=maximum_class;++j) {
485
                floor_setup->data.t1.class_dimensions[j]=get_bits(gb, 3)+1;
486
                floor_setup->data.t1.class_subclasses[j]=get_bits(gb, 2);
487

    
488
                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]);
489

    
490
                if (floor_setup->data.t1.class_subclasses[j]) {
491
                    int bits=get_bits(gb, 8);
492
                    if (bits>=vc->codebook_count) {
493
                        av_log(vc->avccontext, AV_LOG_ERROR, "Masterbook index %d is out of range.\n", bits);
494
                        return -1;
495
                    }
496
                    floor_setup->data.t1.class_masterbook[j]=bits;
497

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

    
501
                for(k=0;k<(1<<floor_setup->data.t1.class_subclasses[j]);++k) {
502
                    int16_t bits=get_bits(gb, 8)-1;
503
                    if (bits!=-1 && bits>=vc->codebook_count) {
504
                        av_log(vc->avccontext, AV_LOG_ERROR, "Subclass book index %d is out of range.\n", bits);
505
                        return -1;
506
                    }
507
                    floor_setup->data.t1.subclass_books[j][k]=bits;
508

    
509
                    AV_DEBUG("    book %d. : %d \n", k, floor_setup->data.t1.subclass_books[j][k]);
510
                }
511
            }
512

    
513
            floor_setup->data.t1.multiplier=get_bits(gb, 2)+1;
514
            floor_setup->data.t1.x_list_dim=2;
515

    
516
            for(j=0;j<floor_setup->data.t1.partitions;++j) {
517
                floor_setup->data.t1.x_list_dim+=floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];
518
            }
519

    
520
            floor_setup->data.t1.list=av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(vorbis_floor1_entry));
521

    
522

    
523
            rangebits=get_bits(gb, 4);
524
            floor_setup->data.t1.list[0].x = 0;
525
            floor_setup->data.t1.list[1].x = (1<<rangebits);
526

    
527
            for(j=0;j<floor_setup->data.t1.partitions;++j) {
528
                for(k=0;k<floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];++k,++floor1_values) {
529
                    floor_setup->data.t1.list[floor1_values].x=get_bits(gb, rangebits);
530

    
531
                    AV_DEBUG(" %d. floor1 Y coord. %d \n", floor1_values, floor_setup->data.t1.list[floor1_values].x);
532
                }
533
            }
534

    
535
// Precalculate order of x coordinates - needed for decode
536
            ff_vorbis_ready_floor1_list(floor_setup->data.t1.list, floor_setup->data.t1.x_list_dim);
537
        }
538
        else if(floor_setup->floor_type==0) {
539
            uint_fast8_t max_codebook_dim=0;
540

    
541
            floor_setup->decode=vorbis_floor0_decode;
542

    
543
            floor_setup->data.t0.order=get_bits(gb, 8);
544
            floor_setup->data.t0.rate=get_bits(gb, 16);
545
            floor_setup->data.t0.bark_map_size=get_bits(gb, 16);
546
            floor_setup->data.t0.amplitude_bits=get_bits(gb, 6);
547
            /* zero would result in a div by zero later *
548
             * 2^0 - 1 == 0                             */
549
            if (floor_setup->data.t0.amplitude_bits == 0) {
550
              av_log(vc->avccontext, AV_LOG_ERROR,
551
                     "Floor 0 amplitude bits is 0.\n");
552
              return -1;
553
            }
554
            floor_setup->data.t0.amplitude_offset=get_bits(gb, 8);
555
            floor_setup->data.t0.num_books=get_bits(gb, 4)+1;
556

    
557
            /* allocate mem for booklist */
558
            floor_setup->data.t0.book_list=
559
                av_malloc(floor_setup->data.t0.num_books);
560
            if(!floor_setup->data.t0.book_list) { return -1; }
561
            /* read book indexes */
562
            {
563
                int idx;
564
                uint_fast8_t book_idx;
565
                for (idx=0;idx<floor_setup->data.t0.num_books;++idx) {
566
                    book_idx=get_bits(gb, 8);
567
                    if (book_idx>=vc->codebook_count)
568
                        return -1;
569
                    floor_setup->data.t0.book_list[idx]=book_idx;
570
                    if (vc->codebooks[book_idx].dimensions > max_codebook_dim)
571
                        max_codebook_dim=vc->codebooks[book_idx].dimensions;
572
                }
573
            }
574

    
575
            create_map( vc, i );
576

    
577
            /* allocate mem for lsp coefficients */
578
            {
579
                /* codebook dim is for padding if codebook dim doesn't *
580
                 * divide order+1 then we need to read more data       */
581
                floor_setup->data.t0.lsp=
582
                    av_malloc((floor_setup->data.t0.order+1 + max_codebook_dim)
583
                              * sizeof(float));
584
                if(!floor_setup->data.t0.lsp) { return -1; }
585
            }
586

    
587
#ifdef V_DEBUG /* debug output parsed headers */
588
            AV_DEBUG("floor0 order: %u\n", floor_setup->data.t0.order);
589
            AV_DEBUG("floor0 rate: %u\n", floor_setup->data.t0.rate);
590
            AV_DEBUG("floor0 bark map size: %u\n",
591
              floor_setup->data.t0.bark_map_size);
592
            AV_DEBUG("floor0 amplitude bits: %u\n",
593
              floor_setup->data.t0.amplitude_bits);
594
            AV_DEBUG("floor0 amplitude offset: %u\n",
595
              floor_setup->data.t0.amplitude_offset);
596
            AV_DEBUG("floor0 number of books: %u\n",
597
              floor_setup->data.t0.num_books);
598
            AV_DEBUG("floor0 book list pointer: %p\n",
599
              floor_setup->data.t0.book_list);
600
            {
601
              int idx;
602
              for (idx=0;idx<floor_setup->data.t0.num_books;++idx) {
603
                AV_DEBUG( "  Book %d: %u\n",
604
                  idx+1,
605
                  floor_setup->data.t0.book_list[idx] );
606
              }
607
            }
608
#endif
609
        }
610
        else {
611
            av_log(vc->avccontext, AV_LOG_ERROR, "Invalid floor type!\n");
612
            return -1;
613
        }
614
    }
615
    return 0;
616
}
617

    
618
// Process residues part
619

    
620
static int vorbis_parse_setup_hdr_residues(vorbis_context *vc){
621
    GetBitContext *gb=&vc->gb;
622
    uint_fast8_t i, j, k;
623

    
624
    vc->residue_count=get_bits(gb, 6)+1;
625
    vc->residues=av_mallocz(vc->residue_count * sizeof(vorbis_residue));
626

    
627
    AV_DEBUG(" There are %d residues. \n", vc->residue_count);
628

    
629
    for(i=0;i<vc->residue_count;++i) {
630
        vorbis_residue *res_setup=&vc->residues[i];
631
        uint_fast8_t cascade[64];
632
        uint_fast8_t high_bits;
633
        uint_fast8_t low_bits;
634

    
635
        res_setup->type=get_bits(gb, 16);
636

    
637
        AV_DEBUG(" %d. residue type %d \n", i, res_setup->type);
638

    
639
        res_setup->begin=get_bits(gb, 24);
640
        res_setup->end=get_bits(gb, 24);
641
        res_setup->partition_size=get_bits(gb, 24)+1;
642
        /* Validations to prevent a buffer overflow later. */
643
        if (res_setup->begin>res_setup->end
644
        || res_setup->end>vc->blocksize[1]/(res_setup->type==2?1:2)
645
        || (res_setup->end-res_setup->begin)/res_setup->partition_size>V_MAX_PARTITIONS) {
646
            av_log(vc->avccontext, AV_LOG_ERROR, "partition out of bounds: type, begin, end, size, blocksize: %d, %d, %d, %d, %d\n", res_setup->type, res_setup->begin, res_setup->end, res_setup->partition_size, vc->blocksize[1]/2);
647
            return -1;
648
        }
649

    
650
        res_setup->classifications=get_bits(gb, 6)+1;
651
        res_setup->classbook=get_bits(gb, 8);
652
        if (res_setup->classbook>=vc->codebook_count) {
653
            av_log(vc->avccontext, AV_LOG_ERROR, "classbook value %d out of range. \n", res_setup->classbook);
654
            return -1;
655
        }
656

    
657
        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,
658
          res_setup->classifications, res_setup->classbook);
659

    
660
        for(j=0;j<res_setup->classifications;++j) {
661
            high_bits=0;
662
            low_bits=get_bits(gb, 3);
663
            if (get_bits1(gb)) {
664
                high_bits=get_bits(gb, 5);
665
            }
666
            cascade[j]=(high_bits<<3)+low_bits;
667

    
668
            AV_DEBUG("     %d class casscade depth: %d \n", j, ilog(cascade[j]));
669
        }
670

    
671
        res_setup->maxpass=0;
672
        for(j=0;j<res_setup->classifications;++j) {
673
            for(k=0;k<8;++k) {
674
                if (cascade[j]&(1<<k)) {
675
                    int bits=get_bits(gb, 8);
676
                    if (bits>=vc->codebook_count) {
677
                        av_log(vc->avccontext, AV_LOG_ERROR, "book value %d out of range. \n", bits);
678
                        return -1;
679
                    }
680
                    res_setup->books[j][k]=bits;
681

    
682
                    AV_DEBUG("     %d class casscade depth %d book: %d \n", j, k, res_setup->books[j][k]);
683

    
684
                    if (k>res_setup->maxpass) {
685
                        res_setup->maxpass=k;
686
                    }
687
                } else {
688
                    res_setup->books[j][k]=-1;
689
                }
690
            }
691
        }
692
    }
693
    return 0;
694
}
695

    
696
// Process mappings part
697

    
698
static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc) {
699
    GetBitContext *gb=&vc->gb;
700
    uint_fast8_t i, j;
701

    
702
    vc->mapping_count=get_bits(gb, 6)+1;
703
    vc->mappings=av_mallocz(vc->mapping_count * sizeof(vorbis_mapping));
704

    
705
    AV_DEBUG(" There are %d mappings. \n", vc->mapping_count);
706

    
707
    for(i=0;i<vc->mapping_count;++i) {
708
        vorbis_mapping *mapping_setup=&vc->mappings[i];
709

    
710
        if (get_bits(gb, 16)) {
711
            av_log(vc->avccontext, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n");
712
            return -1;
713
        }
714
        if (get_bits1(gb)) {
715
            mapping_setup->submaps=get_bits(gb, 4)+1;
716
        } else {
717
            mapping_setup->submaps=1;
718
        }
719

    
720
        if (get_bits1(gb)) {
721
            mapping_setup->coupling_steps=get_bits(gb, 8)+1;
722
            mapping_setup->magnitude=av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
723
            mapping_setup->angle    =av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
724
            for(j=0;j<mapping_setup->coupling_steps;++j) {
725
                mapping_setup->magnitude[j]=get_bits(gb, ilog(vc->audio_channels-1));
726
                mapping_setup->angle[j]=get_bits(gb, ilog(vc->audio_channels-1));
727
                if (mapping_setup->magnitude[j]>=vc->audio_channels) {
728
                    av_log(vc->avccontext, AV_LOG_ERROR, "magnitude channel %d out of range. \n", mapping_setup->magnitude[j]);
729
                    return -1;
730
                }
731
                if (mapping_setup->angle[j]>=vc->audio_channels) {
732
                    av_log(vc->avccontext, AV_LOG_ERROR, "angle channel %d out of range. \n", mapping_setup->angle[j]);
733
                    return -1;
734
                }
735
            }
736
        } else {
737
            mapping_setup->coupling_steps=0;
738
        }
739

    
740
        AV_DEBUG("   %d mapping coupling steps: %d \n", i, mapping_setup->coupling_steps);
741

    
742
        if(get_bits(gb, 2)) {
743
            av_log(vc->avccontext, AV_LOG_ERROR, "%d. mapping setup data invalid. \n", i);
744
            return -1; // following spec.
745
        }
746

    
747
        if (mapping_setup->submaps>1) {
748
            mapping_setup->mux=av_mallocz(vc->audio_channels * sizeof(uint_fast8_t));
749
            for(j=0;j<vc->audio_channels;++j) {
750
                mapping_setup->mux[j]=get_bits(gb, 4);
751
            }
752
        }
753

    
754
        for(j=0;j<mapping_setup->submaps;++j) {
755
            int bits;
756
            skip_bits(gb, 8); // FIXME check?
757
            bits=get_bits(gb, 8);
758
            if (bits>=vc->floor_count) {
759
                av_log(vc->avccontext, AV_LOG_ERROR, "submap floor value %d out of range. \n", bits);
760
                return -1;
761
            }
762
            mapping_setup->submap_floor[j]=bits;
763
            bits=get_bits(gb, 8);
764
            if (bits>=vc->residue_count) {
765
                av_log(vc->avccontext, AV_LOG_ERROR, "submap residue value %d out of range. \n", bits);
766
                return -1;
767
            }
768
            mapping_setup->submap_residue[j]=bits;
769

    
770
            AV_DEBUG("   %d mapping %d submap : floor %d, residue %d \n", i, j, mapping_setup->submap_floor[j], mapping_setup->submap_residue[j]);
771
        }
772
    }
773
    return 0;
774
}
775

    
776
// Process modes part
777

    
778
static void create_map( vorbis_context * vc, uint_fast8_t floor_number )
779
{
780
    vorbis_floor * floors=vc->floors;
781
    vorbis_floor0 * vf;
782
    int idx;
783
    int_fast8_t blockflag;
784
    int_fast32_t * map;
785
    int_fast32_t n; //TODO: could theoretically be smaller?
786

    
787
    for (blockflag=0;blockflag<2;++blockflag)
788
    {
789
    n=vc->blocksize[blockflag]/2;
790
    floors[floor_number].data.t0.map[blockflag]=
791
        av_malloc((n+1) * sizeof(int_fast32_t)); // n+sentinel
792

    
793
    map=floors[floor_number].data.t0.map[blockflag];
794
    vf=&floors[floor_number].data.t0;
795

    
796
    for (idx=0; idx<n;++idx) {
797
        map[idx]=floor( BARK((vf->rate*idx)/(2.0f*n)) *
798
                              ((vf->bark_map_size)/
799
                               BARK(vf->rate/2.0f )) );
800
        if (vf->bark_map_size-1 < map[idx]) {
801
            map[idx]=vf->bark_map_size-1;
802
        }
803
    }
804
    map[n]=-1;
805
    vf->map_size[blockflag]=n;
806
    }
807

    
808
#   ifdef V_DEBUG
809
    for(idx=0;idx<=n;++idx) {
810
        AV_DEBUG("floor0 map: map at pos %d is %d\n",
811
                 idx, map[idx]);
812
    }
813
#   endif
814
}
815

    
816
static int vorbis_parse_setup_hdr_modes(vorbis_context *vc) {
817
    GetBitContext *gb=&vc->gb;
818
    uint_fast8_t i;
819

    
820
    vc->mode_count=get_bits(gb, 6)+1;
821
    vc->modes=av_mallocz(vc->mode_count * sizeof(vorbis_mode));
822

    
823
    AV_DEBUG(" There are %d modes.\n", vc->mode_count);
824

    
825
    for(i=0;i<vc->mode_count;++i) {
826
        vorbis_mode *mode_setup=&vc->modes[i];
827

    
828
        mode_setup->blockflag=get_bits1(gb);
829
        mode_setup->windowtype=get_bits(gb, 16); //FIXME check
830
        mode_setup->transformtype=get_bits(gb, 16); //FIXME check
831
        mode_setup->mapping=get_bits(gb, 8);
832
        if (mode_setup->mapping>=vc->mapping_count) {
833
            av_log(vc->avccontext, AV_LOG_ERROR, "mode mapping value %d out of range. \n", mode_setup->mapping);
834
            return -1;
835
        }
836

    
837
        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);
838
    }
839
    return 0;
840
}
841

    
842
// Process the whole setup header using the functions above
843

    
844
static int vorbis_parse_setup_hdr(vorbis_context *vc) {
845
    GetBitContext *gb=&vc->gb;
846

    
847
    if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') ||
848
    (get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') ||
849
    (get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) {
850
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n");
851
        return -1;
852
    }
853

    
854
    if (vorbis_parse_setup_hdr_codebooks(vc)) {
855
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n");
856
        return -2;
857
    }
858
    if (vorbis_parse_setup_hdr_tdtransforms(vc)) {
859
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n");
860
        return -3;
861
    }
862
    if (vorbis_parse_setup_hdr_floors(vc)) {
863
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n");
864
        return -4;
865
    }
866
    if (vorbis_parse_setup_hdr_residues(vc)) {
867
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n");
868
        return -5;
869
    }
870
    if (vorbis_parse_setup_hdr_mappings(vc)) {
871
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n");
872
        return -6;
873
    }
874
    if (vorbis_parse_setup_hdr_modes(vc)) {
875
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n");
876
        return -7;
877
    }
878
    if (!get_bits1(gb)) {
879
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n");
880
        return -8; // framing flag bit unset error
881
    }
882

    
883
    return 0;
884
}
885

    
886
// Process the identification header
887

    
888
static int vorbis_parse_id_hdr(vorbis_context *vc){
889
    GetBitContext *gb=&vc->gb;
890
    uint_fast8_t bl0, bl1;
891

    
892
    if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') ||
893
    (get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') ||
894
    (get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) {
895
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n");
896
        return -1;
897
    }
898

    
899
    vc->version=get_bits_long(gb, 32);    //FIXME check 0
900
    vc->audio_channels=get_bits(gb, 8);
901
    if(vc->audio_channels <= 0){
902
        av_log(vc->avccontext, AV_LOG_ERROR, "Invalid number of channels\n");
903
        return -1;
904
    }
905
    vc->audio_samplerate=get_bits_long(gb, 32);
906
    if(vc->audio_samplerate <= 0){
907
        av_log(vc->avccontext, AV_LOG_ERROR, "Invalid samplerate\n");
908
        return -1;
909
    }
910
    vc->bitrate_maximum=get_bits_long(gb, 32);
911
    vc->bitrate_nominal=get_bits_long(gb, 32);
912
    vc->bitrate_minimum=get_bits_long(gb, 32);
913
    bl0=get_bits(gb, 4);
914
    bl1=get_bits(gb, 4);
915
    vc->blocksize[0]=(1<<bl0);
916
    vc->blocksize[1]=(1<<bl1);
917
    if (bl0>13 || bl0<6 || bl1>13 || bl1<6 || bl1<bl0) {
918
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n");
919
        return -3;
920
    }
921
    // output format int16
922
    if (vc->blocksize[1]/2 * vc->audio_channels * 2 >
923
                                             AVCODEC_MAX_AUDIO_FRAME_SIZE) {
924
        av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis channel count makes "
925
               "output packets too large.\n");
926
        return -4;
927
    }
928
    vc->win[0]=ff_vorbis_vwin[bl0-6];
929
    vc->win[1]=ff_vorbis_vwin[bl1-6];
930

    
931
    if ((get_bits1(gb)) == 0) {
932
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n");
933
        return -2;
934
    }
935

    
936
    vc->channel_residues= av_malloc((vc->blocksize[1]/2)*vc->audio_channels * sizeof(float));
937
    vc->channel_floors  = av_malloc((vc->blocksize[1]/2)*vc->audio_channels * sizeof(float));
938
    vc->saved           = av_mallocz((vc->blocksize[1]/4)*vc->audio_channels * sizeof(float));
939
    vc->previous_window=0;
940

    
941
    ff_mdct_init(&vc->mdct[0], bl0, 1, vc->exp_bias ? -(1<<15) : -1.0);
942
    ff_mdct_init(&vc->mdct[1], bl1, 1, vc->exp_bias ? -(1<<15) : -1.0);
943

    
944
    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 ",
945
            vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize[0], vc->blocksize[1]);
946

    
947
/*
948
    BLK=vc->blocksize[0];
949
    for(i=0;i<BLK/2;++i) {
950
        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)));
951
    }
952
*/
953

    
954
    return 0;
955
}
956

    
957
// Process the extradata using the functions above (identification header, setup header)
958

    
959
static av_cold int vorbis_decode_init(AVCodecContext *avccontext) {
960
    vorbis_context *vc = avccontext->priv_data ;
961
    uint8_t *headers = avccontext->extradata;
962
    int headers_len=avccontext->extradata_size;
963
    uint8_t *header_start[3];
964
    int header_len[3];
965
    GetBitContext *gb = &(vc->gb);
966
    int hdr_type;
967

    
968
    vc->avccontext = avccontext;
969
    dsputil_init(&vc->dsp, avccontext);
970

    
971
    if(vc->dsp.float_to_int16_interleave == ff_float_to_int16_interleave_c) {
972
        vc->add_bias = 385;
973
        vc->exp_bias = 0;
974
    } else {
975
        vc->add_bias = 0;
976
        vc->exp_bias = 15<<23;
977
    }
978

    
979
    if (!headers_len) {
980
        av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
981
        return -1;
982
    }
983

    
984
    if (ff_split_xiph_headers(headers, headers_len, 30, header_start, header_len) < 0) {
985
        av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
986
        return -1;
987
    }
988

    
989
    init_get_bits(gb, header_start[0], header_len[0]*8);
990
    hdr_type=get_bits(gb, 8);
991
    if (hdr_type!=1) {
992
        av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n");
993
        return -1;
994
    }
995
    if (vorbis_parse_id_hdr(vc)) {
996
        av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n");
997
        vorbis_free(vc);
998
        return -1;
999
    }
1000

    
1001
    init_get_bits(gb, header_start[2], header_len[2]*8);
1002
    hdr_type=get_bits(gb, 8);
1003
    if (hdr_type!=5) {
1004
        av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");
1005
        vorbis_free(vc);
1006
        return -1;
1007
    }
1008
    if (vorbis_parse_setup_hdr(vc)) {
1009
        av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");
1010
        vorbis_free(vc);
1011
        return -1;
1012
    }
1013

    
1014
    avccontext->channels = vc->audio_channels;
1015
    avccontext->sample_rate = vc->audio_samplerate;
1016
    avccontext->frame_size  = FFMIN(vc->blocksize[0], vc->blocksize[1])>>2;
1017
    avccontext->sample_fmt = SAMPLE_FMT_S16;
1018

    
1019
    return 0 ;
1020
}
1021

    
1022
// Decode audiopackets -------------------------------------------------
1023

    
1024
// Read and decode floor
1025

    
1026
static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,
1027
                                         vorbis_floor_data *vfu, float *vec) {
1028
    vorbis_floor0 * vf=&vfu->t0;
1029
    float * lsp=vf->lsp;
1030
    uint_fast32_t amplitude;
1031
    uint_fast32_t book_idx;
1032
    uint_fast8_t blockflag=vc->modes[vc->mode_number].blockflag;
1033

    
1034
    amplitude=get_bits(&vc->gb, vf->amplitude_bits);
1035
    if (amplitude>0) {
1036
        float last = 0;
1037
        uint_fast16_t lsp_len = 0;
1038
        uint_fast16_t idx;
1039
        vorbis_codebook codebook;
1040

    
1041
        book_idx=get_bits(&vc->gb, ilog(vf->num_books));
1042
        if ( book_idx >= vf->num_books ) {
1043
            av_log( vc->avccontext, AV_LOG_ERROR,
1044
                    "floor0 dec: booknumber too high!\n" );
1045
            book_idx= 0;
1046
            //FIXME: look above
1047
        }
1048
        AV_DEBUG( "floor0 dec: booknumber: %u\n", book_idx );
1049
        codebook=vc->codebooks[vf->book_list[book_idx]];
1050

    
1051
        while (lsp_len<vf->order) {
1052
            int vec_off;
1053

    
1054
            AV_DEBUG( "floor0 dec: book dimension: %d\n", codebook.dimensions );
1055
            AV_DEBUG( "floor0 dec: maximum depth: %d\n", codebook.maxdepth );
1056
            /* read temp vector */
1057
            vec_off=get_vlc2(&vc->gb,
1058
                             codebook.vlc.table,
1059
                             codebook.nb_bits,
1060
                             codebook.maxdepth ) *
1061
                             codebook.dimensions;
1062
            AV_DEBUG( "floor0 dec: vector offset: %d\n", vec_off );
1063
            /* copy each vector component and add last to it */
1064
            for (idx=0; idx<codebook.dimensions; ++idx) {
1065
                lsp[lsp_len+idx]=codebook.codevectors[vec_off+idx]+last;
1066
            }
1067
            last=lsp[lsp_len+idx-1]; /* set last to last vector component */
1068

    
1069
            lsp_len += codebook.dimensions;
1070
        }
1071
#ifdef V_DEBUG
1072
        /* DEBUG: output lsp coeffs */
1073
        {
1074
            int idx;
1075
            for ( idx = 0; idx < lsp_len; ++idx )
1076
                AV_DEBUG("floor0 dec: coeff at %d is %f\n", idx, lsp[idx] );
1077
        }
1078
#endif
1079

    
1080
        /* synthesize floor output vector */
1081
        {
1082
            int i;
1083
            int order=vf->order;
1084
            float wstep=M_PI/vf->bark_map_size;
1085

    
1086
            for(i=0;i<order;i++) { lsp[i]=2.0f*cos(lsp[i]); }
1087

    
1088
            AV_DEBUG("floor0 synth: map_size=%d; m=%d; wstep=%f\n",
1089
                     vf->map_size, order, wstep);
1090

    
1091
            i=0;
1092
            while(i<vf->map_size[blockflag]) {
1093
                int j, iter_cond=vf->map[blockflag][i];
1094
                float p=0.5f;
1095
                float q=0.5f;
1096
                float two_cos_w=2.0f*cos(wstep*iter_cond); // needed all times
1097

    
1098
                /* similar part for the q and p products */
1099
                for(j=0;j+1<order;j+=2) {
1100
                    q *= lsp[j]  -two_cos_w;
1101
                    p *= lsp[j+1]-two_cos_w;
1102
                }
1103
                if(j==order) { // even order
1104
                    p *= p*(2.0f-two_cos_w);
1105
                    q *= q*(2.0f+two_cos_w);
1106
                }
1107
                else { // odd order
1108
                    q *= two_cos_w-lsp[j]; // one more time for q
1109

    
1110
                    /* final step and square */
1111
                    p *= p*(4.f-two_cos_w*two_cos_w);
1112
                    q *= q;
1113
                }
1114

    
1115
                /* calculate linear floor value */
1116
                {
1117
                    q=exp( (
1118
                             ( (amplitude*vf->amplitude_offset)/
1119
                               (((1<<vf->amplitude_bits)-1) * sqrt(p+q)) )
1120
                             - vf->amplitude_offset ) * .11512925f
1121
                         );
1122
                }
1123

    
1124
                /* fill vector */
1125
                do { vec[i]=q; ++i; }while(vf->map[blockflag][i]==iter_cond);
1126
            }
1127
        }
1128
    }
1129
    else {
1130
        /* this channel is unused */
1131
        return 1;
1132
    }
1133

    
1134
    AV_DEBUG(" Floor0 decoded\n");
1135

    
1136
    return 0;
1137
}
1138

    
1139
static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc, vorbis_floor_data *vfu, float *vec) {
1140
    vorbis_floor1 * vf=&vfu->t1;
1141
    GetBitContext *gb=&vc->gb;
1142
    uint_fast16_t range_v[4]={ 256, 128, 86, 64 };
1143
    uint_fast16_t range=range_v[vf->multiplier-1];
1144
    uint_fast16_t floor1_Y[vf->x_list_dim];
1145
    uint_fast16_t floor1_Y_final[vf->x_list_dim];
1146
    int floor1_flag[vf->x_list_dim];
1147
    uint_fast8_t class_;
1148
    uint_fast8_t cdim;
1149
    uint_fast8_t cbits;
1150
    uint_fast8_t csub;
1151
    uint_fast8_t cval;
1152
    int_fast16_t book;
1153
    uint_fast16_t offset;
1154
    uint_fast16_t i,j;
1155
    /*u*/int_fast16_t adx, ady, off, predicted; // WTF ? dy/adx= (unsigned)dy/adx ?
1156
    int_fast16_t dy, err;
1157

    
1158

    
1159
    if (!get_bits1(gb)) return 1; // silence
1160

    
1161
// Read values (or differences) for the floor's points
1162

    
1163
    floor1_Y[0]=get_bits(gb, ilog(range-1));
1164
    floor1_Y[1]=get_bits(gb, ilog(range-1));
1165

    
1166
    AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);
1167

    
1168
    offset=2;
1169
    for(i=0;i<vf->partitions;++i) {
1170
        class_=vf->partition_class[i];
1171
        cdim=vf->class_dimensions[class_];
1172
        cbits=vf->class_subclasses[class_];
1173
        csub=(1<<cbits)-1;
1174
        cval=0;
1175

    
1176
        AV_DEBUG("Cbits %d \n", cbits);
1177

    
1178
        if (cbits) { // this reads all subclasses for this partition's class
1179
            cval=get_vlc2(gb, vc->codebooks[vf->class_masterbook[class_]].vlc.table,
1180
            vc->codebooks[vf->class_masterbook[class_]].nb_bits, 3);
1181
        }
1182

    
1183
        for(j=0;j<cdim;++j) {
1184
            book=vf->subclass_books[class_][cval & csub];
1185

    
1186
            AV_DEBUG("book %d Cbits %d cval %d  bits:%d \n", book, cbits, cval, get_bits_count(gb));
1187

    
1188
            cval=cval>>cbits;
1189
            if (book>-1) {
1190
                floor1_Y[offset+j]=get_vlc2(gb, vc->codebooks[book].vlc.table,
1191
                vc->codebooks[book].nb_bits, 3);
1192
            } else {
1193
                floor1_Y[offset+j]=0;
1194
            }
1195

    
1196
            AV_DEBUG(" floor(%d) = %d \n", vf->list[offset+j].x, floor1_Y[offset+j]);
1197
        }
1198
        offset+=cdim;
1199
    }
1200

    
1201
// Amplitude calculation from the differences
1202

    
1203
    floor1_flag[0]=1;
1204
    floor1_flag[1]=1;
1205
    floor1_Y_final[0]=floor1_Y[0];
1206
    floor1_Y_final[1]=floor1_Y[1];
1207

    
1208
    for(i=2;i<vf->x_list_dim;++i) {
1209
        uint_fast16_t val, highroom, lowroom, room;
1210
        uint_fast16_t high_neigh_offs;
1211
        uint_fast16_t low_neigh_offs;
1212

    
1213
        low_neigh_offs=vf->list[i].low;
1214
        high_neigh_offs=vf->list[i].high;
1215
        dy=floor1_Y_final[high_neigh_offs]-floor1_Y_final[low_neigh_offs];  // render_point begin
1216
        adx=vf->list[high_neigh_offs].x-vf->list[low_neigh_offs].x;
1217
        ady= FFABS(dy);
1218
        err=ady*(vf->list[i].x-vf->list[low_neigh_offs].x);
1219
        off=(int16_t)err/(int16_t)adx;
1220
        if (dy<0) {
1221
            predicted=floor1_Y_final[low_neigh_offs]-off;
1222
        } else {
1223
            predicted=floor1_Y_final[low_neigh_offs]+off;
1224
        } // render_point end
1225

    
1226
        val=floor1_Y[i];
1227
        highroom=range-predicted;
1228
        lowroom=predicted;
1229
        if (highroom < lowroom) {
1230
            room=highroom*2;
1231
        } else {
1232
            room=lowroom*2;   // SPEC mispelling
1233
        }
1234
        if (val) {
1235
            floor1_flag[low_neigh_offs]=1;
1236
            floor1_flag[high_neigh_offs]=1;
1237
            floor1_flag[i]=1;
1238
            if (val>=room) {
1239
                if (highroom > lowroom) {
1240
                    floor1_Y_final[i]=val-lowroom+predicted;
1241
                } else {
1242
                    floor1_Y_final[i]=predicted-val+highroom-1;
1243
                }
1244
            } else {
1245
                if (val & 1) {
1246
                    floor1_Y_final[i]=predicted-(val+1)/2;
1247
                } else {
1248
                    floor1_Y_final[i]=predicted+val/2;
1249
                }
1250
            }
1251
        } else {
1252
            floor1_flag[i]=0;
1253
            floor1_Y_final[i]=predicted;
1254
        }
1255

    
1256
        AV_DEBUG(" Decoded floor(%d) = %d / val %d \n", vf->list[i].x, floor1_Y_final[i], val);
1257
    }
1258

    
1259
// Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?
1260

    
1261
    ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);
1262

    
1263
    AV_DEBUG(" Floor decoded\n");
1264

    
1265
    return 0;
1266
}
1267

    
1268
// Read and decode residue
1269

    
1270
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) {
1271
    GetBitContext *gb=&vc->gb;
1272
    uint_fast8_t c_p_c=vc->codebooks[vr->classbook].dimensions;
1273
    uint_fast16_t n_to_read=vr->end-vr->begin;
1274
    uint_fast16_t ptns_to_read=n_to_read/vr->partition_size;
1275
    uint_fast8_t classifs[ptns_to_read*vc->audio_channels];
1276
    uint_fast8_t pass;
1277
    uint_fast8_t ch_used;
1278
    uint_fast8_t i,j,l;
1279
    uint_fast16_t k;
1280

    
1281
    if (vr_type==2) {
1282
        for(j=1;j<ch;++j) {
1283
                do_not_decode[0]&=do_not_decode[j];  // FIXME - clobbering input
1284
        }
1285
        if (do_not_decode[0]) return 0;
1286
        ch_used=1;
1287
    } else {
1288
        ch_used=ch;
1289
    }
1290

    
1291
    AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);
1292

    
1293
    for(pass=0;pass<=vr->maxpass;++pass) { // FIXME OPTIMIZE?
1294
        uint_fast16_t voffset;
1295
        uint_fast16_t partition_count;
1296
        uint_fast16_t j_times_ptns_to_read;
1297

    
1298
        voffset=vr->begin;
1299
        for(partition_count=0;partition_count<ptns_to_read;) {  // SPEC        error
1300
            if (!pass) {
1301
                uint_fast32_t inverse_class = ff_inverse[vr->classifications];
1302
                for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {
1303
                    if (!do_not_decode[j]) {
1304
                        uint_fast32_t temp=get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,
1305
                        vc->codebooks[vr->classbook].nb_bits, 3);
1306

    
1307
                        AV_DEBUG("Classword: %d \n", temp);
1308

    
1309
                        assert(vr->classifications > 1 && temp<=65536); //needed for inverse[]
1310
                        for(i=0;i<c_p_c;++i) {
1311
                            uint_fast32_t temp2;
1312

    
1313
                            temp2=(((uint_fast64_t)temp) * inverse_class)>>32;
1314
                            if (partition_count+c_p_c-1-i < ptns_to_read) {
1315
                                classifs[j_times_ptns_to_read+partition_count+c_p_c-1-i]=temp-temp2*vr->classifications;
1316
                            }
1317
                            temp=temp2;
1318
                        }
1319
                    }
1320
                    j_times_ptns_to_read+=ptns_to_read;
1321
                }
1322
            }
1323
            for(i=0;(i<c_p_c) && (partition_count<ptns_to_read);++i) {
1324
                for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {
1325
                    uint_fast16_t voffs;
1326

    
1327
                    if (!do_not_decode[j]) {
1328
                        uint_fast8_t vqclass=classifs[j_times_ptns_to_read+partition_count];
1329
                        int_fast16_t vqbook=vr->books[vqclass][pass];
1330

    
1331
                        if (vqbook>=0 && vc->codebooks[vqbook].codevectors) {
1332
                            uint_fast16_t coffs;
1333
                            unsigned dim= vc->codebooks[vqbook].dimensions; // not uint_fast8_t: 64bit is slower here on amd64
1334
                            uint_fast16_t step= dim==1 ? vr->partition_size
1335
                                              : FASTDIV(vr->partition_size, dim);
1336
                            vorbis_codebook codebook= vc->codebooks[vqbook];
1337

    
1338
                            if (vr_type==0) {
1339

    
1340
                                voffs=voffset+j*vlen;
1341
                                for(k=0;k<step;++k) {
1342
                                    coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1343
                                    for(l=0;l<dim;++l) {
1344
                                        vec[voffs+k+l*step]+=codebook.codevectors[coffs+l];  // FPMATH
1345
                                    }
1346
                                }
1347
                            }
1348
                            else if (vr_type==1) {
1349
                                voffs=voffset+j*vlen;
1350
                                for(k=0;k<step;++k) {
1351
                                    coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1352
                                    for(l=0;l<dim;++l, ++voffs) {
1353
                                        vec[voffs]+=codebook.codevectors[coffs+l];  // FPMATH
1354

    
1355
                                        AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d  \n", pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);
1356
                                    }
1357
                                }
1358
                            }
1359
                            else if (vr_type==2 && ch==2 && (voffset&1)==0 && (dim&1)==0) { // most frequent case optimized
1360
                                voffs=voffset>>1;
1361

    
1362
                                if(dim==2) {
1363
                                    for(k=0;k<step;++k) {
1364
                                        coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;
1365
                                        vec[voffs+k     ]+=codebook.codevectors[coffs  ];  // FPMATH
1366
                                        vec[voffs+k+vlen]+=codebook.codevectors[coffs+1];  // FPMATH
1367
                                    }
1368
                                } else if(dim==4) {
1369
                                    for(k=0;k<step;++k, voffs+=2) {
1370
                                        coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4;
1371
                                        vec[voffs       ]+=codebook.codevectors[coffs  ];  // FPMATH
1372
                                        vec[voffs+1     ]+=codebook.codevectors[coffs+2];  // FPMATH
1373
                                        vec[voffs+vlen  ]+=codebook.codevectors[coffs+1];  // FPMATH
1374
                                        vec[voffs+vlen+1]+=codebook.codevectors[coffs+3];  // FPMATH
1375
                                    }
1376
                                } else
1377
                                for(k=0;k<step;++k) {
1378
                                    coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1379
                                    for(l=0;l<dim;l+=2, voffs++) {
1380
                                        vec[voffs     ]+=codebook.codevectors[coffs+l  ];  // FPMATH
1381
                                        vec[voffs+vlen]+=codebook.codevectors[coffs+l+1];  // FPMATH
1382

    
1383
                                        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);
1384
                                    }
1385
                                }
1386

    
1387
                            }
1388
                            else if (vr_type==2) {
1389
                                voffs=voffset;
1390

    
1391
                                for(k=0;k<step;++k) {
1392
                                    coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1393
                                    for(l=0;l<dim;++l, ++voffs) {
1394
                                        vec[voffs/ch+(voffs%ch)*vlen]+=codebook.codevectors[coffs+l];  // FPMATH FIXME use if and counter instead of / and %
1395

    
1396
                                        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);
1397
                                    }
1398
                                }
1399
                            }
1400
                        }
1401
                    }
1402
                    j_times_ptns_to_read+=ptns_to_read;
1403
                }
1404
                ++partition_count;
1405
                voffset+=vr->partition_size;
1406
            }
1407
        }
1408
    }
1409
    return 0;
1410
}
1411

    
1412
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)
1413
{
1414
    if (vr->type==2)
1415
        return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 2);
1416
    else if (vr->type==1)
1417
        return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 1);
1418
    else if (vr->type==0)
1419
        return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 0);
1420
    else {
1421
        av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");
1422
        return -1;
1423
    }
1424
}
1425

    
1426
void vorbis_inverse_coupling(float *mag, float *ang, int blocksize)
1427
{
1428
    int i;
1429
    for(i=0; i<blocksize; i++)
1430
    {
1431
        if (mag[i]>0.0) {
1432
            if (ang[i]>0.0) {
1433
                ang[i]=mag[i]-ang[i];
1434
            } else {
1435
                float temp=ang[i];
1436
                ang[i]=mag[i];
1437
                mag[i]+=temp;
1438
            }
1439
        } else {
1440
            if (ang[i]>0.0) {
1441
                ang[i]+=mag[i];
1442
            } else {
1443
                float temp=ang[i];
1444
                ang[i]=mag[i];
1445
                mag[i]-=temp;
1446
            }
1447
        }
1448
    }
1449
}
1450

    
1451
static void copy_normalize(float *dst, float *src, int len, int exp_bias, float add_bias)
1452
{
1453
    int i;
1454
    if(exp_bias) {
1455
        memcpy(dst, src, len * sizeof(float));
1456
    } else {
1457
        for(i=0; i<len; i++)
1458
            dst[i] = src[i] + add_bias;
1459
    }
1460
}
1461

    
1462
// Decode the audio packet using the functions above
1463

    
1464
static int vorbis_parse_audio_packet(vorbis_context *vc) {
1465
    GetBitContext *gb=&vc->gb;
1466

    
1467
    uint_fast8_t previous_window=vc->previous_window;
1468
    uint_fast8_t mode_number;
1469
    uint_fast8_t blockflag;
1470
    uint_fast16_t blocksize;
1471
    int_fast32_t i,j;
1472
    uint_fast8_t no_residue[vc->audio_channels];
1473
    uint_fast8_t do_not_decode[vc->audio_channels];
1474
    vorbis_mapping *mapping;
1475
    float *ch_res_ptr=vc->channel_residues;
1476
    float *ch_floor_ptr=vc->channel_floors;
1477
    uint_fast8_t res_chan[vc->audio_channels];
1478
    uint_fast8_t res_num=0;
1479
    int_fast16_t retlen=0;
1480
    float fadd_bias = vc->add_bias;
1481

    
1482
    if (get_bits1(gb)) {
1483
        av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");
1484
        return -1; // packet type not audio
1485
    }
1486

    
1487
    if (vc->mode_count==1) {
1488
        mode_number=0;
1489
    } else {
1490
        mode_number=get_bits(gb, ilog(vc->mode_count-1));
1491
    }
1492
    if (mode_number>=vc->mode_count) {
1493
        av_log(vc->avccontext, AV_LOG_ERROR, "mode number %d out of range.\n", mode_number);
1494
        return -1;
1495
    }
1496
    vc->mode_number=mode_number;
1497
    mapping=&vc->mappings[vc->modes[mode_number].mapping];
1498

    
1499
    AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);
1500

    
1501
    blockflag=vc->modes[mode_number].blockflag;
1502
    blocksize=vc->blocksize[blockflag];
1503
    if (blockflag) {
1504
        skip_bits(gb, 2); // previous_window, next_window
1505
    }
1506

    
1507
    memset(ch_res_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?
1508
    memset(ch_floor_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?
1509

    
1510
// Decode floor
1511

    
1512
    for(i=0;i<vc->audio_channels;++i) {
1513
        vorbis_floor *floor;
1514
        if (mapping->submaps>1) {
1515
            floor=&vc->floors[mapping->submap_floor[mapping->mux[i]]];
1516
        } else {
1517
            floor=&vc->floors[mapping->submap_floor[0]];
1518
        }
1519

    
1520
        no_residue[i]=floor->decode(vc, &floor->data, ch_floor_ptr);
1521
        ch_floor_ptr+=blocksize/2;
1522
    }
1523

    
1524
// Nonzero vector propagate
1525

    
1526
    for(i=mapping->coupling_steps-1;i>=0;--i) {
1527
        if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {
1528
            no_residue[mapping->magnitude[i]]=0;
1529
            no_residue[mapping->angle[i]]=0;
1530
        }
1531
    }
1532

    
1533
// Decode residue
1534

    
1535
    for(i=0;i<mapping->submaps;++i) {
1536
        vorbis_residue *residue;
1537
        uint_fast8_t ch=0;
1538

    
1539
        for(j=0;j<vc->audio_channels;++j) {
1540
            if ((mapping->submaps==1) || (i==mapping->mux[j])) {
1541
                res_chan[j]=res_num;
1542
                if (no_residue[j]) {
1543
                    do_not_decode[ch]=1;
1544
                } else {
1545
                    do_not_decode[ch]=0;
1546
                }
1547
                ++ch;
1548
                ++res_num;
1549
            }
1550
        }
1551
        residue=&vc->residues[mapping->submap_residue[i]];
1552
        vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);
1553

    
1554
        ch_res_ptr+=ch*blocksize/2;
1555
    }
1556

    
1557
// Inverse coupling
1558

    
1559
    for(i=mapping->coupling_steps-1;i>=0;--i) { //warning: i has to be signed
1560
        float *mag, *ang;
1561

    
1562
        mag=vc->channel_residues+res_chan[mapping->magnitude[i]]*blocksize/2;
1563
        ang=vc->channel_residues+res_chan[mapping->angle[i]]*blocksize/2;
1564
        vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize/2);
1565
    }
1566

    
1567
// Dotproduct, MDCT
1568

    
1569
    for(j=vc->audio_channels-1;j>=0;j--) {
1570
        ch_floor_ptr=vc->channel_floors+j*blocksize/2;
1571
        ch_res_ptr=vc->channel_residues+res_chan[j]*blocksize/2;
1572
        vc->dsp.vector_fmul(ch_floor_ptr, ch_res_ptr, blocksize/2);
1573
        ff_imdct_half(&vc->mdct[blockflag], ch_res_ptr, ch_floor_ptr);
1574
    }
1575

    
1576
// Overlap/add, save data for next overlapping  FPMATH
1577

    
1578
    retlen = (blocksize + vc->blocksize[previous_window])/4;
1579
    for(j=0;j<vc->audio_channels;j++) {
1580
        uint_fast16_t bs0=vc->blocksize[0];
1581
        uint_fast16_t bs1=vc->blocksize[1];
1582
        float *residue=vc->channel_residues+res_chan[j]*blocksize/2;
1583
        float *saved=vc->saved+j*bs1/4;
1584
        float *ret=vc->channel_floors+j*retlen;
1585
        float *buf=residue;
1586
        const float *win=vc->win[blockflag&previous_window];
1587

    
1588
        if(blockflag == previous_window) {
1589
            vc->dsp.vector_fmul_window(ret, saved, buf, win, fadd_bias, blocksize/4);
1590
        } else if(blockflag > previous_window) {
1591
            vc->dsp.vector_fmul_window(ret, saved, buf, win, fadd_bias, bs0/4);
1592
            copy_normalize(ret+bs0/2, buf+bs0/4, (bs1-bs0)/4, vc->exp_bias, fadd_bias);
1593
        } else {
1594
            copy_normalize(ret, saved, (bs1-bs0)/4, vc->exp_bias, fadd_bias);
1595
            vc->dsp.vector_fmul_window(ret+(bs1-bs0)/4, saved+(bs1-bs0)/4, buf, win, fadd_bias, bs0/4);
1596
        }
1597
        memcpy(saved, buf+blocksize/4, blocksize/4*sizeof(float));
1598
    }
1599

    
1600
    vc->previous_window = blockflag;
1601
    return retlen;
1602
}
1603

    
1604
// Return the decoded audio packet through the standard api
1605

    
1606
static int vorbis_decode_frame(AVCodecContext *avccontext,
1607
                        void *data, int *data_size,
1608
                        AVPacket *avpkt)
1609
{
1610
    const uint8_t *buf = avpkt->data;
1611
    int buf_size = avpkt->size;
1612
    vorbis_context *vc = avccontext->priv_data ;
1613
    GetBitContext *gb = &(vc->gb);
1614
    const float *channel_ptrs[vc->audio_channels];
1615
    int i;
1616

    
1617
    int_fast16_t len;
1618

    
1619
    if(!buf_size){
1620
        return 0;
1621
    }
1622

    
1623
    AV_DEBUG("packet length %d \n", buf_size);
1624

    
1625
    init_get_bits(gb, buf, buf_size*8);
1626

    
1627
    len=vorbis_parse_audio_packet(vc);
1628

    
1629
    if (len<=0) {
1630
        *data_size=0;
1631
        return buf_size;
1632
    }
1633

    
1634
    if (!vc->first_frame) {
1635
        vc->first_frame=1;
1636
        *data_size=0;
1637
        return buf_size ;
1638
    }
1639

    
1640
    AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);
1641

    
1642
    for(i=0; i<vc->audio_channels; i++)
1643
        channel_ptrs[i] = vc->channel_floors+i*len;
1644
    vc->dsp.float_to_int16_interleave(data, channel_ptrs, len, vc->audio_channels);
1645
    *data_size=len*2*vc->audio_channels;
1646

    
1647
    return buf_size ;
1648
}
1649

    
1650
// Close decoder
1651

    
1652
static av_cold int vorbis_decode_close(AVCodecContext *avccontext) {
1653
    vorbis_context *vc = avccontext->priv_data;
1654

    
1655
    vorbis_free(vc);
1656

    
1657
    return 0 ;
1658
}
1659

    
1660
AVCodec vorbis_decoder = {
1661
    "vorbis",
1662
    CODEC_TYPE_AUDIO,
1663
    CODEC_ID_VORBIS,
1664
    sizeof(vorbis_context),
1665
    vorbis_decode_init,
1666
    NULL,
1667
    vorbis_decode_close,
1668
    vorbis_decode_frame,
1669
    .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),
1670
};
1671