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ffmpeg / libavcodec / vorbis_dec.c @ f27e1d64

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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.
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.
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 *
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
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 * 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 "bitstream.h"
32
#include "dsputil.h"
33

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

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

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

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

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

    
57
typedef union vorbis_floor_u vorbis_floor_data;
58
typedef struct vorbis_floor0_s vorbis_floor0;
59
typedef struct vorbis_floor1_s vorbis_floor1;
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struct vorbis_context_s;
61
typedef
62
uint_fast8_t (* vorbis_floor_decode_func)
63
             (struct vorbis_context_s *, vorbis_floor_data *, float *);
64
typedef struct {
65
    uint_fast8_t floor_type;
66
    vorbis_floor_decode_func decode;
67
    union vorbis_floor_u
68
    {
69
        struct vorbis_floor0_s
70
        {
71
            uint_fast8_t order;
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            uint_fast16_t rate;
73
            uint_fast16_t bark_map_size;
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            int_fast32_t * map[2];
75
            uint_fast32_t map_size[2];
76
            uint_fast8_t amplitude_bits;
77
            uint_fast8_t amplitude_offset;
78
            uint_fast8_t num_books;
79
            uint_fast8_t * book_list;
80
            float * lsp;
81
        } t0;
82
        struct vorbis_floor1_s
83
        {
84
            uint_fast8_t partitions;
85
            uint_fast8_t maximum_class;
86
            uint_fast8_t partition_class[32];
87
            uint_fast8_t class_dimensions[16];
88
            uint_fast8_t class_subclasses[16];
89
            uint_fast8_t class_masterbook[16];
90
            int_fast16_t subclass_books[16][8];
91
            uint_fast8_t multiplier;
92
            uint_fast16_t x_list_dim;
93
            floor1_entry_t * list;
94
        } t1;
95
    } data;
96
} vorbis_floor;
97

    
98
typedef struct {
99
    uint_fast16_t type;
100
    uint_fast32_t begin;
101
    uint_fast32_t end;
102
    uint_fast32_t partition_size;
103
    uint_fast8_t classifications;
104
    uint_fast8_t classbook;
105
    int_fast16_t books[64][8];
106
    uint_fast8_t maxpass;
107
} vorbis_residue;
108

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

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

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

    
131
    MDCTContext mdct[2];
132
    uint_fast8_t first_frame;
133
    uint_fast32_t version;
134
    uint_fast8_t audio_channels;
135
    uint_fast32_t audio_samplerate;
136
    uint_fast32_t bitrate_maximum;
137
    uint_fast32_t bitrate_nominal;
138
    uint_fast32_t bitrate_minimum;
139
    uint_fast32_t blocksize[2];
140
    const float * win[2];
141
    uint_fast16_t codebook_count;
142
    vorbis_codebook *codebooks;
143
    uint_fast8_t floor_count;
144
    vorbis_floor *floors;
145
    uint_fast8_t residue_count;
146
    vorbis_residue *residues;
147
    uint_fast8_t mapping_count;
148
    vorbis_mapping *mappings;
149
    uint_fast8_t mode_count;
150
    vorbis_mode *modes;
151
    uint_fast8_t mode_number; // mode number for the current packet
152
    uint_fast8_t previous_window;
153
    float *channel_residues;
154
    float *channel_floors;
155
    float *saved;
156
    float *ret;
157
    float *buf;
158
    float *buf_tmp;
159
    uint_fast32_t add_bias; // for float->int conversion
160
    uint_fast32_t exp_bias;
161
} vorbis_context;
162

    
163
/* Helper functions */
164

    
165
#define BARK(x) \
166
    (13.1f*atan(0.00074f*(x))+2.24f*atan(1.85e-8f*(x)*(x))+1e-4f*(x))
167

    
168
static float vorbisfloat2float(uint_fast32_t val) {
169
    double mant=val&0x1fffff;
170
    long exp=(val&0x7fe00000L)>>21;
171
    if (val&0x80000000) mant=-mant;
172
    return ldexp(mant, exp - 20 - 768);
173
}
174

    
175

    
176
// Free all allocated memory -----------------------------------------
177

    
178
static void vorbis_free(vorbis_context *vc) {
179
    int_fast16_t i;
180

    
181
    av_freep(&vc->channel_residues);
182
    av_freep(&vc->channel_floors);
183
    av_freep(&vc->saved);
184
    av_freep(&vc->ret);
185
    av_freep(&vc->buf);
186
    av_freep(&vc->buf_tmp);
187

    
188
    av_freep(&vc->residues);
189
    av_freep(&vc->modes);
190

    
191
    ff_mdct_end(&vc->mdct[0]);
192
    ff_mdct_end(&vc->mdct[1]);
193

    
194
    for(i=0;i<vc->codebook_count;++i) {
195
        av_free(vc->codebooks[i].codevectors);
196
        free_vlc(&vc->codebooks[i].vlc);
197
    }
198
    av_freep(&vc->codebooks);
199

    
200
    for(i=0;i<vc->floor_count;++i) {
201
        if(vc->floors[i].floor_type==0) {
202
            av_free(vc->floors[i].data.t0.map[0]);
203
            av_free(vc->floors[i].data.t0.map[1]);
204
            av_free(vc->floors[i].data.t0.book_list);
205
            av_free(vc->floors[i].data.t0.lsp);
206
        }
207
        else {
208
            av_free(vc->floors[i].data.t1.list);
209
        }
210
    }
211
    av_freep(&vc->floors);
212

    
213
    for(i=0;i<vc->mapping_count;++i) {
214
        av_free(vc->mappings[i].magnitude);
215
        av_free(vc->mappings[i].angle);
216
        av_free(vc->mappings[i].mux);
217
    }
218
    av_freep(&vc->mappings);
219

    
220
    if(vc->exp_bias){
221
        av_freep(&vc->win[0]);
222
        av_freep(&vc->win[1]);
223
    }
224
}
225

    
226
// Parse setup header -------------------------------------------------
227

    
228
// Process codebooks part
229

    
230
static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc) {
231
    uint_fast16_t cb;
232
    uint8_t *tmp_vlc_bits;
233
    uint32_t *tmp_vlc_codes;
234
    GetBitContext *gb=&vc->gb;
235

    
236
    vc->codebook_count=get_bits(gb,8)+1;
237

    
238
    AV_DEBUG(" Codebooks: %d \n", vc->codebook_count);
239

    
240
    vc->codebooks=av_mallocz(vc->codebook_count * sizeof(vorbis_codebook));
241
    tmp_vlc_bits =av_mallocz(V_MAX_VLCS * sizeof(uint8_t));
242
    tmp_vlc_codes=av_mallocz(V_MAX_VLCS * sizeof(uint32_t));
243

    
244
    for(cb=0;cb<vc->codebook_count;++cb) {
245
        vorbis_codebook *codebook_setup=&vc->codebooks[cb];
246
        uint_fast8_t ordered;
247
        uint_fast32_t t, used_entries=0;
248
        uint_fast32_t entries;
249

    
250
        AV_DEBUG(" %d. Codebook \n", cb);
251

    
252
        if (get_bits(gb, 24)!=0x564342) {
253
            av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook setup data corrupt. \n", cb);
254
            goto error;
255
        }
256

    
257
        codebook_setup->dimensions=get_bits(gb, 16);
258
        if (codebook_setup->dimensions>16) {
259
            av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook's dimension is too large (%d). \n", cb, codebook_setup->dimensions);
260
            goto error;
261
        }
262
        entries=get_bits(gb, 24);
263
        if (entries>V_MAX_VLCS) {
264
            av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook has too many entries (%"PRIdFAST32"). \n", cb, entries);
265
            goto error;
266
        }
267

    
268
        ordered=get_bits1(gb);
269

    
270
        AV_DEBUG(" codebook_dimensions %d, codebook_entries %d \n", codebook_setup->dimensions, entries);
271

    
272
        if (!ordered) {
273
            uint_fast16_t ce;
274
            uint_fast8_t flag;
275
            uint_fast8_t sparse=get_bits1(gb);
276

    
277
            AV_DEBUG(" not ordered \n");
278

    
279
            if (sparse) {
280
                AV_DEBUG(" sparse \n");
281

    
282
                used_entries=0;
283
                for(ce=0;ce<entries;++ce) {
284
                    flag=get_bits1(gb);
285
                    if (flag) {
286
                        tmp_vlc_bits[ce]=get_bits(gb, 5)+1;
287
                        ++used_entries;
288
                    }
289
                    else tmp_vlc_bits[ce]=0;
290
                }
291
            } else {
292
                AV_DEBUG(" not sparse \n");
293

    
294
                used_entries=entries;
295
                for(ce=0;ce<entries;++ce) {
296
                    tmp_vlc_bits[ce]=get_bits(gb, 5)+1;
297
                }
298
            }
299
        } else {
300
            uint_fast16_t current_entry=0;
301
            uint_fast8_t current_length=get_bits(gb, 5)+1;
302

    
303
            AV_DEBUG(" ordered, current length: %d \n", current_length);  //FIXME
304

    
305
            used_entries=entries;
306
            for(;current_entry<used_entries;++current_length) {
307
                uint_fast16_t i, number;
308

    
309
                AV_DEBUG(" number bits: %d ", ilog(entries - current_entry));
310

    
311
                number=get_bits(gb, ilog(entries - current_entry));
312

    
313
                AV_DEBUG(" number: %d \n", number);
314

    
315
                for(i=current_entry;i<number+current_entry;++i) {
316
                    if (i<used_entries) tmp_vlc_bits[i]=current_length;
317
                }
318

    
319
                current_entry+=number;
320
            }
321
            if (current_entry>used_entries) {
322
                av_log(vc->avccontext, AV_LOG_ERROR, " More codelengths than codes in codebook. \n");
323
                goto error;
324
            }
325
        }
326

    
327
        codebook_setup->lookup_type=get_bits(gb, 4);
328

    
329
        AV_DEBUG(" lookup type: %d : %s \n", codebook_setup->lookup_type, codebook_setup->lookup_type ? "vq" : "no lookup" );
330

    
331
// If the codebook is used for (inverse) VQ, calculate codevectors.
332

    
333
        if (codebook_setup->lookup_type==1) {
334
            uint_fast16_t i, j, k;
335
            uint_fast16_t codebook_lookup_values=ff_vorbis_nth_root(entries, codebook_setup->dimensions);
336
            uint_fast16_t codebook_multiplicands[codebook_lookup_values];
337

    
338
            float codebook_minimum_value=vorbisfloat2float(get_bits_long(gb, 32));
339
            float codebook_delta_value=vorbisfloat2float(get_bits_long(gb, 32));
340
            uint_fast8_t codebook_value_bits=get_bits(gb, 4)+1;
341
            uint_fast8_t codebook_sequence_p=get_bits1(gb);
342

    
343
            AV_DEBUG(" We expect %d numbers for building the codevectors. \n", codebook_lookup_values);
344
            AV_DEBUG("  delta %f minmum %f \n", codebook_delta_value, codebook_minimum_value);
345

    
346
            for(i=0;i<codebook_lookup_values;++i) {
347
                codebook_multiplicands[i]=get_bits(gb, codebook_value_bits);
348

    
349
                AV_DEBUG(" multiplicands*delta+minmum : %e \n", (float)codebook_multiplicands[i]*codebook_delta_value+codebook_minimum_value);
350
                AV_DEBUG(" multiplicand %d \n", codebook_multiplicands[i]);
351
            }
352

    
353
// Weed out unused vlcs and build codevector vector
354
            codebook_setup->codevectors=used_entries ? av_mallocz(used_entries*codebook_setup->dimensions * sizeof(float)) : NULL;
355
            for(j=0, i=0;i<entries;++i) {
356
                uint_fast8_t dim=codebook_setup->dimensions;
357

    
358
                if (tmp_vlc_bits[i]) {
359
                    float last=0.0;
360
                    uint_fast32_t lookup_offset=i;
361

    
362
#ifdef V_DEBUG
363
                    av_log(vc->avccontext, AV_LOG_INFO, "Lookup offset %d ,", i);
364
#endif
365

    
366
                    for(k=0;k<dim;++k) {
367
                        uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values;
368
                        codebook_setup->codevectors[j*dim+k]=codebook_multiplicands[multiplicand_offset]*codebook_delta_value+codebook_minimum_value+last;
369
                        if (codebook_sequence_p) {
370
                            last=codebook_setup->codevectors[j*dim+k];
371
                        }
372
                        lookup_offset/=codebook_lookup_values;
373
                    }
374
                    tmp_vlc_bits[j]=tmp_vlc_bits[i];
375

    
376
#ifdef V_DEBUG
377
                    av_log(vc->avccontext, AV_LOG_INFO, "real lookup offset %d, vector: ", j);
378
                    for(k=0;k<dim;++k) {
379
                        av_log(vc->avccontext, AV_LOG_INFO, " %f ", codebook_setup->codevectors[j*dim+k]);
380
                    }
381
                    av_log(vc->avccontext, AV_LOG_INFO, "\n");
382
#endif
383

    
384
                    ++j;
385
                }
386
            }
387
            if (j!=used_entries) {
388
                av_log(vc->avccontext, AV_LOG_ERROR, "Bug in codevector vector building code. \n");
389
                goto error;
390
            }
391
            entries=used_entries;
392
        }
393
        else if (codebook_setup->lookup_type>=2) {
394
            av_log(vc->avccontext, AV_LOG_ERROR, "Codebook lookup type not supported. \n");
395
            goto error;
396
        }
397

    
398
// Initialize VLC table
399
        if (ff_vorbis_len2vlc(tmp_vlc_bits, tmp_vlc_codes, entries)) {
400
            av_log(vc->avccontext, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");
401
            goto error;
402
        }
403
        codebook_setup->maxdepth=0;
404
        for(t=0;t<entries;++t)
405
            if (tmp_vlc_bits[t]>=codebook_setup->maxdepth) codebook_setup->maxdepth=tmp_vlc_bits[t];
406

    
407
        if(codebook_setup->maxdepth > 3*V_NB_BITS) codebook_setup->nb_bits=V_NB_BITS2;
408
        else                                       codebook_setup->nb_bits=V_NB_BITS;
409

    
410
        codebook_setup->maxdepth=(codebook_setup->maxdepth+codebook_setup->nb_bits-1)/codebook_setup->nb_bits;
411

    
412
        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)) {
413
            av_log(vc->avccontext, AV_LOG_ERROR, " Error generating vlc tables. \n");
414
            goto error;
415
        }
416
    }
417

    
418
    av_free(tmp_vlc_bits);
419
    av_free(tmp_vlc_codes);
420
    return 0;
421

    
422
// Error:
423
error:
424
    av_free(tmp_vlc_bits);
425
    av_free(tmp_vlc_codes);
426
    return 1;
427
}
428

    
429
// Process time domain transforms part (unused in Vorbis I)
430

    
431
static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc) {
432
    GetBitContext *gb=&vc->gb;
433
    uint_fast8_t i;
434
    uint_fast8_t vorbis_time_count=get_bits(gb, 6)+1;
435

    
436
    for(i=0;i<vorbis_time_count;++i) {
437
        uint_fast16_t vorbis_tdtransform=get_bits(gb, 16);
438

    
439
        AV_DEBUG(" Vorbis time domain transform %d: %d \n", vorbis_time_count, vorbis_tdtransform);
440

    
441
        if (vorbis_tdtransform) {
442
            av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n");
443
            return 1;
444
        }
445
    }
446
    return 0;
447
}
448

    
449
// Process floors part
450

    
451
static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,
452
                                         vorbis_floor_data *vfu, float *vec);
453
static void create_map( vorbis_context * vc, uint_fast8_t floor_number );
454
static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc,
455
                                         vorbis_floor_data *vfu, float *vec);
456
static int vorbis_parse_setup_hdr_floors(vorbis_context *vc) {
457
    GetBitContext *gb=&vc->gb;
458
    uint_fast16_t i,j,k;
459

    
460
    vc->floor_count=get_bits(gb, 6)+1;
461

    
462
    vc->floors=av_mallocz(vc->floor_count * sizeof(vorbis_floor));
463

    
464
    for (i=0;i<vc->floor_count;++i) {
465
        vorbis_floor *floor_setup=&vc->floors[i];
466

    
467
        floor_setup->floor_type=get_bits(gb, 16);
468

    
469
        AV_DEBUG(" %d. floor type %d \n", i, floor_setup->floor_type);
470

    
471
        if (floor_setup->floor_type==1) {
472
            uint_fast8_t maximum_class=0;
473
            uint_fast8_t rangebits;
474
            uint_fast16_t floor1_values=2;
475

    
476
            floor_setup->decode=vorbis_floor1_decode;
477

    
478
            floor_setup->data.t1.partitions=get_bits(gb, 5);
479

    
480
            AV_DEBUG(" %d.floor: %d partitions \n", i, floor_setup->data.t1.partitions);
481

    
482
            for(j=0;j<floor_setup->data.t1.partitions;++j) {
483
                floor_setup->data.t1.partition_class[j]=get_bits(gb, 4);
484
                if (floor_setup->data.t1.partition_class[j]>maximum_class) maximum_class=floor_setup->data.t1.partition_class[j];
485

    
486
                AV_DEBUG(" %d. floor %d partition class %d \n", i, j, floor_setup->data.t1.partition_class[j]);
487

    
488
            }
489

    
490
            AV_DEBUG(" maximum class %d \n", maximum_class);
491

    
492
            floor_setup->data.t1.maximum_class=maximum_class;
493

    
494
            for(j=0;j<=maximum_class;++j) {
495
                floor_setup->data.t1.class_dimensions[j]=get_bits(gb, 3)+1;
496
                floor_setup->data.t1.class_subclasses[j]=get_bits(gb, 2);
497

    
498
                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]);
499

    
500
                if (floor_setup->data.t1.class_subclasses[j]) {
501
                    floor_setup->data.t1.class_masterbook[j]=get_bits(gb, 8);
502

    
503
                    AV_DEBUG("   masterbook: %d \n", floor_setup->data.t1.class_masterbook[j]);
504
                }
505

    
506
                for(k=0;k<(1<<floor_setup->data.t1.class_subclasses[j]);++k) {
507
                    floor_setup->data.t1.subclass_books[j][k]=(int16_t)get_bits(gb, 8)-1;
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(floor1_entry_t));
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
                    floor_setup->data.t0.book_list[idx]=book_idx;
568
                    if (vc->codebooks[book_idx].dimensions > max_codebook_dim)
569
                        max_codebook_dim=vc->codebooks[book_idx].dimensions;
570

    
571
                    if (floor_setup->data.t0.book_list[idx]>vc->codebook_count)
572
                        return 1;
573
                }
574
            }
575

    
576
            create_map( vc, i );
577

    
578
            /* allocate mem for lsp coefficients */
579
            {
580
                /* codebook dim is for padding if codebook dim doesn't *
581
                 * divide order+1 then we need to read more data       */
582
                floor_setup->data.t0.lsp=
583
                    av_malloc((floor_setup->data.t0.order+1 + max_codebook_dim)
584
                              * sizeof(float));
585
                if(!floor_setup->data.t0.lsp) { return 1; }
586
            }
587

    
588
#ifdef V_DEBUG /* debug output parsed headers */
589
            AV_DEBUG("floor0 order: %u\n", floor_setup->data.t0.order);
590
            AV_DEBUG("floor0 rate: %u\n", floor_setup->data.t0.rate);
591
            AV_DEBUG("floor0 bark map size: %u\n",
592
              floor_setup->data.t0.bark_map_size);
593
            AV_DEBUG("floor0 amplitude bits: %u\n",
594
              floor_setup->data.t0.amplitude_bits);
595
            AV_DEBUG("floor0 amplitude offset: %u\n",
596
              floor_setup->data.t0.amplitude_offset);
597
            AV_DEBUG("floor0 number of books: %u\n",
598
              floor_setup->data.t0.num_books);
599
            AV_DEBUG("floor0 book list pointer: %p\n",
600
              floor_setup->data.t0.book_list);
601
            {
602
              int idx;
603
              for (idx=0;idx<floor_setup->data.t0.num_books;++idx) {
604
                AV_DEBUG( "  Book %d: %u\n",
605
                  idx+1,
606
                  floor_setup->data.t0.book_list[idx] );
607
              }
608
            }
609
#endif
610
        }
611
        else {
612
            av_log(vc->avccontext, AV_LOG_ERROR, "Invalid floor type!\n");
613
            return 1;
614
        }
615
    }
616
    return 0;
617
}
618

    
619
// Process residues part
620

    
621
static int vorbis_parse_setup_hdr_residues(vorbis_context *vc){
622
    GetBitContext *gb=&vc->gb;
623
    uint_fast8_t i, j, k;
624

    
625
    vc->residue_count=get_bits(gb, 6)+1;
626
    vc->residues=av_mallocz(vc->residue_count * sizeof(vorbis_residue));
627

    
628
    AV_DEBUG(" There are %d residues. \n", vc->residue_count);
629

    
630
    for(i=0;i<vc->residue_count;++i) {
631
        vorbis_residue *res_setup=&vc->residues[i];
632
        uint_fast8_t cascade[64];
633
        uint_fast8_t high_bits;
634
        uint_fast8_t low_bits;
635

    
636
        res_setup->type=get_bits(gb, 16);
637

    
638
        AV_DEBUG(" %d. residue type %d \n", i, res_setup->type);
639

    
640
        res_setup->begin=get_bits(gb, 24);
641
        res_setup->end=get_bits(gb, 24);
642
        res_setup->partition_size=get_bits(gb, 24)+1;
643
        res_setup->classifications=get_bits(gb, 6)+1;
644
        res_setup->classbook=get_bits(gb, 8);
645

    
646
        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,
647
          res_setup->classifications, res_setup->classbook);
648

    
649
        for(j=0;j<res_setup->classifications;++j) {
650
            high_bits=0;
651
            low_bits=get_bits(gb, 3);
652
            if (get_bits1(gb)) {
653
                high_bits=get_bits(gb, 5);
654
            }
655
            cascade[j]=(high_bits<<3)+low_bits;
656

    
657
            AV_DEBUG("     %d class casscade depth: %d \n", j, ilog(cascade[j]));
658
        }
659

    
660
        res_setup->maxpass=0;
661
        for(j=0;j<res_setup->classifications;++j) {
662
            for(k=0;k<8;++k) {
663
                if (cascade[j]&(1<<k)) {
664
                        res_setup->books[j][k]=get_bits(gb, 8);
665

    
666
                    AV_DEBUG("     %d class casscade depth %d book: %d \n", j, k, res_setup->books[j][k]);
667

    
668
                    if (k>res_setup->maxpass) {
669
                        res_setup->maxpass=k;
670
                    }
671
                } else {
672
                    res_setup->books[j][k]=-1;
673
                }
674
            }
675
        }
676
    }
677
    return 0;
678
}
679

    
680
// Process mappings part
681

    
682
static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc) {
683
    GetBitContext *gb=&vc->gb;
684
    uint_fast8_t i, j;
685

    
686
    vc->mapping_count=get_bits(gb, 6)+1;
687
    vc->mappings=av_mallocz(vc->mapping_count * sizeof(vorbis_mapping));
688

    
689
    AV_DEBUG(" There are %d mappings. \n", vc->mapping_count);
690

    
691
    for(i=0;i<vc->mapping_count;++i) {
692
        vorbis_mapping *mapping_setup=&vc->mappings[i];
693

    
694
        if (get_bits(gb, 16)) {
695
            av_log(vc->avccontext, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n");
696
            return 1;
697
        }
698
        if (get_bits1(gb)) {
699
            mapping_setup->submaps=get_bits(gb, 4)+1;
700
        } else {
701
            mapping_setup->submaps=1;
702
        }
703

    
704
        if (get_bits1(gb)) {
705
            mapping_setup->coupling_steps=get_bits(gb, 8)+1;
706
            mapping_setup->magnitude=av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
707
            mapping_setup->angle    =av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
708
            for(j=0;j<mapping_setup->coupling_steps;++j) {
709
                mapping_setup->magnitude[j]=get_bits(gb, ilog(vc->audio_channels-1));
710
                mapping_setup->angle[j]=get_bits(gb, ilog(vc->audio_channels-1));
711
                // FIXME: sanity checks
712
            }
713
        } else {
714
            mapping_setup->coupling_steps=0;
715
        }
716

    
717
        AV_DEBUG("   %d mapping coupling steps: %d \n", i, mapping_setup->coupling_steps);
718

    
719
        if(get_bits(gb, 2)) {
720
            av_log(vc->avccontext, AV_LOG_ERROR, "%d. mapping setup data invalid. \n", i);
721
            return 1; // following spec.
722
        }
723

    
724
        if (mapping_setup->submaps>1) {
725
            mapping_setup->mux=av_mallocz(vc->audio_channels * sizeof(uint_fast8_t));
726
            for(j=0;j<vc->audio_channels;++j) {
727
                mapping_setup->mux[j]=get_bits(gb, 4);
728
            }
729
        }
730

    
731
        for(j=0;j<mapping_setup->submaps;++j) {
732
            skip_bits(gb, 8); // FIXME check?
733
            mapping_setup->submap_floor[j]=get_bits(gb, 8);
734
            mapping_setup->submap_residue[j]=get_bits(gb, 8);
735

    
736
            AV_DEBUG("   %d mapping %d submap : floor %d, residue %d \n", i, j, mapping_setup->submap_floor[j], mapping_setup->submap_residue[j]);
737
        }
738
    }
739
    return 0;
740
}
741

    
742
// Process modes part
743

    
744
static void create_map( vorbis_context * vc, uint_fast8_t floor_number )
745
{
746
    vorbis_floor * floors=vc->floors;
747
    vorbis_floor0 * vf;
748
    int idx;
749
    int_fast8_t blockflag;
750
    int_fast32_t * map;
751
    int_fast32_t n; //TODO: could theoretically be smaller?
752

    
753
    for (blockflag=0;blockflag<2;++blockflag)
754
    {
755
    n=vc->blocksize[blockflag]/2;
756
    floors[floor_number].data.t0.map[blockflag]=
757
        av_malloc((n+1) * sizeof(int_fast32_t)); // n+sentinel
758

    
759
    map=floors[floor_number].data.t0.map[blockflag];
760
    vf=&floors[floor_number].data.t0;
761

    
762
    for (idx=0; idx<n;++idx) {
763
        map[idx]=floor( BARK((vf->rate*idx)/(2.0f*n)) *
764
                              ((vf->bark_map_size)/
765
                               BARK(vf->rate/2.0f )) );
766
        if (vf->bark_map_size-1 < map[idx]) {
767
            map[idx]=vf->bark_map_size-1;
768
        }
769
    }
770
    map[n]=-1;
771
    vf->map_size[blockflag]=n;
772
    }
773

    
774
#   ifdef V_DEBUG
775
    for(idx=0;idx<=n;++idx) {
776
        AV_DEBUG("floor0 map: map at pos %d is %d\n",
777
                 idx, map[idx]);
778
    }
779
#   endif
780
}
781

    
782
static int vorbis_parse_setup_hdr_modes(vorbis_context *vc) {
783
    GetBitContext *gb=&vc->gb;
784
    uint_fast8_t i;
785

    
786
    vc->mode_count=get_bits(gb, 6)+1;
787
    vc->modes=av_mallocz(vc->mode_count * sizeof(vorbis_mode));
788

    
789
    AV_DEBUG(" There are %d modes.\n", vc->mode_count);
790

    
791
    for(i=0;i<vc->mode_count;++i) {
792
        vorbis_mode *mode_setup=&vc->modes[i];
793

    
794
        mode_setup->blockflag=get_bits1(gb);
795
        mode_setup->windowtype=get_bits(gb, 16); //FIXME check
796
        mode_setup->transformtype=get_bits(gb, 16); //FIXME check
797
        mode_setup->mapping=get_bits(gb, 8); //FIXME check
798

    
799
        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);
800
    }
801
    return 0;
802
}
803

    
804
// Process the whole setup header using the functions above
805

    
806
static int vorbis_parse_setup_hdr(vorbis_context *vc) {
807
    GetBitContext *gb=&vc->gb;
808

    
809
    if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') ||
810
    (get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') ||
811
    (get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) {
812
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n");
813
        return 1;
814
    }
815

    
816
    if (vorbis_parse_setup_hdr_codebooks(vc)) {
817
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n");
818
        return 2;
819
    }
820
    if (vorbis_parse_setup_hdr_tdtransforms(vc)) {
821
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n");
822
        return 3;
823
    }
824
    if (vorbis_parse_setup_hdr_floors(vc)) {
825
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n");
826
        return 4;
827
    }
828
    if (vorbis_parse_setup_hdr_residues(vc)) {
829
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n");
830
        return 5;
831
    }
832
    if (vorbis_parse_setup_hdr_mappings(vc)) {
833
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n");
834
        return 6;
835
    }
836
    if (vorbis_parse_setup_hdr_modes(vc)) {
837
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n");
838
        return 7;
839
    }
840
    if (!get_bits1(gb)) {
841
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n");
842
        return 8; // framing flag bit unset error
843
    }
844

    
845
    return 0;
846
}
847

    
848
// Process the identification header
849

    
850
static int vorbis_parse_id_hdr(vorbis_context *vc){
851
    GetBitContext *gb=&vc->gb;
852
    uint_fast8_t bl0, bl1;
853

    
854
    if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') ||
855
    (get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') ||
856
    (get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) {
857
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n");
858
        return 1;
859
    }
860

    
861
    vc->version=get_bits_long(gb, 32);    //FIXME check 0
862
    vc->audio_channels=get_bits(gb, 8);   //FIXME check >0
863
    vc->audio_samplerate=get_bits_long(gb, 32);   //FIXME check >0
864
    vc->bitrate_maximum=get_bits_long(gb, 32);
865
    vc->bitrate_nominal=get_bits_long(gb, 32);
866
    vc->bitrate_minimum=get_bits_long(gb, 32);
867
    bl0=get_bits(gb, 4);
868
    bl1=get_bits(gb, 4);
869
    vc->blocksize[0]=(1<<bl0);
870
    vc->blocksize[1]=(1<<bl1);
871
    if (bl0>13 || bl0<6 || bl1>13 || bl1<6 || bl1<bl0) {
872
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n");
873
        return 3;
874
    }
875
    // output format int16
876
    if (vc->blocksize[1]/2 * vc->audio_channels * 2 >
877
                                             AVCODEC_MAX_AUDIO_FRAME_SIZE) {
878
        av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis channel count makes "
879
               "output packets too large.\n");
880
        return 4;
881
    }
882
    vc->win[0]=ff_vorbis_vwin[bl0-6];
883
    vc->win[1]=ff_vorbis_vwin[bl1-6];
884

    
885
    if(vc->exp_bias){
886
        int i, j;
887
        for(j=0; j<2; j++){
888
            float *win = av_malloc(vc->blocksize[j]/2 * sizeof(float));
889
            for(i=0; i<vc->blocksize[j]/2; i++)
890
                win[i] = vc->win[j][i] * (1<<15);
891
            vc->win[j] = win;
892
        }
893
    }
894

    
895
    if ((get_bits1(gb)) == 0) {
896
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n");
897
        return 2;
898
    }
899

    
900
    vc->channel_residues= av_malloc((vc->blocksize[1]/2)*vc->audio_channels * sizeof(float));
901
    vc->channel_floors  = av_malloc((vc->blocksize[1]/2)*vc->audio_channels * sizeof(float));
902
    vc->saved           = av_mallocz((vc->blocksize[1]/2)*vc->audio_channels * sizeof(float));
903
    vc->ret             = av_malloc((vc->blocksize[1]/2)*vc->audio_channels * sizeof(float));
904
    vc->buf             = av_malloc( vc->blocksize[1]                       * sizeof(float));
905
    vc->buf_tmp         = av_malloc( vc->blocksize[1]                       * sizeof(float));
906
    vc->previous_window=0;
907

    
908
    ff_mdct_init(&vc->mdct[0], bl0, 1);
909
    ff_mdct_init(&vc->mdct[1], bl1, 1);
910

    
911
    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 ",
912
            vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize[0], vc->blocksize[1]);
913

    
914
/*
915
    BLK=vc->blocksize[0];
916
    for(i=0;i<BLK/2;++i) {
917
        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)));
918
    }
919
*/
920

    
921
    return 0;
922
}
923

    
924
// Process the extradata using the functions above (identification header, setup header)
925

    
926
static av_cold int vorbis_decode_init(AVCodecContext *avccontext) {
927
    vorbis_context *vc = avccontext->priv_data ;
928
    uint8_t *headers = avccontext->extradata;
929
    int headers_len=avccontext->extradata_size;
930
    uint8_t *header_start[3];
931
    int header_len[3];
932
    GetBitContext *gb = &(vc->gb);
933
    int hdr_type;
934

    
935
    vc->avccontext = avccontext;
936
    dsputil_init(&vc->dsp, avccontext);
937

    
938
    if(vc->dsp.float_to_int16 == ff_float_to_int16_c) {
939
        vc->add_bias = 385;
940
        vc->exp_bias = 0;
941
    } else {
942
        vc->add_bias = 0;
943
        vc->exp_bias = 15<<23;
944
    }
945

    
946
    if (!headers_len) {
947
        av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
948
        return -1;
949
    }
950

    
951
    if (ff_split_xiph_headers(headers, headers_len, 30, header_start, header_len) < 0) {
952
        av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
953
        return -1;
954
    }
955

    
956
    init_get_bits(gb, header_start[0], header_len[0]*8);
957
    hdr_type=get_bits(gb, 8);
958
    if (hdr_type!=1) {
959
        av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n");
960
        return -1;
961
    }
962
    if (vorbis_parse_id_hdr(vc)) {
963
        av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n");
964
        vorbis_free(vc);
965
        return -1;
966
    }
967

    
968
    init_get_bits(gb, header_start[2], header_len[2]*8);
969
    hdr_type=get_bits(gb, 8);
970
    if (hdr_type!=5) {
971
        av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");
972
        return -1;
973
    }
974
    if (vorbis_parse_setup_hdr(vc)) {
975
        av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");
976
        vorbis_free(vc);
977
        return -1;
978
    }
979

    
980
    avccontext->channels = vc->audio_channels;
981
    avccontext->sample_rate = vc->audio_samplerate;
982
    avccontext->frame_size  = FFMIN(vc->blocksize[0], vc->blocksize[1])>>2;
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
            book_idx= 0;
1011
            //FIXME: look above
1012
        }
1013
        AV_DEBUG( "floor0 dec: booknumber: %u\n", book_idx );
1014
        codebook=vc->codebooks[vf->book_list[book_idx]];
1015

    
1016
        while (lsp_len<vf->order) {
1017
            int vec_off;
1018

    
1019
            AV_DEBUG( "floor0 dec: book dimension: %d\n", codebook.dimensions );
1020
            AV_DEBUG( "floor0 dec: maximum depth: %d\n", codebook.maxdepth );
1021
            /* read temp vector */
1022
            vec_off=get_vlc2(&vc->gb,
1023
                             codebook.vlc.table,
1024
                             codebook.nb_bits,
1025
                             codebook.maxdepth ) *
1026
                             codebook.dimensions;
1027
            AV_DEBUG( "floor0 dec: vector offset: %d\n", vec_off );
1028
            /* copy each vector component and add last to it */
1029
            for (idx=0; idx<codebook.dimensions; ++idx) {
1030
                lsp[lsp_len+idx]=codebook.codevectors[vec_off+idx]+last;
1031
            }
1032
            last=lsp[lsp_len+idx-1]; /* set last to last vector component */
1033

    
1034
            lsp_len += codebook.dimensions;
1035
        }
1036
#ifdef V_DEBUG
1037
        /* DEBUG: output lsp coeffs */
1038
        {
1039
            int idx;
1040
            for ( idx = 0; idx < lsp_len; ++idx )
1041
                AV_DEBUG("floor0 dec: coeff at %d is %f\n", idx, lsp[idx] );
1042
        }
1043
#endif
1044

    
1045
        /* synthesize floor output vector */
1046
        {
1047
            int i;
1048
            int order=vf->order;
1049
            float wstep=M_PI/vf->bark_map_size;
1050

    
1051
            for(i=0;i<order;i++) { lsp[i]=2.0f*cos(lsp[i]); }
1052

    
1053
            AV_DEBUG("floor0 synth: map_size=%d; m=%d; wstep=%f\n",
1054
                     vf->map_size, order, wstep);
1055

    
1056
            i=0;
1057
            while(i<vf->map_size[blockflag]) {
1058
                int j, iter_cond=vf->map[blockflag][i];
1059
                float p=0.5f;
1060
                float q=0.5f;
1061
                float two_cos_w=2.0f*cos(wstep*iter_cond); // needed all times
1062

    
1063
                /* similar part for the q and p products */
1064
                for(j=0;j<order;j+=2) {
1065
                    q *= lsp[j]  -two_cos_w;
1066
                    p *= lsp[j+1]-two_cos_w;
1067
                }
1068
                if(j==order) { // even order
1069
                    p *= p*(2.0f-two_cos_w);
1070
                    q *= q*(2.0f+two_cos_w);
1071
                }
1072
                else { // odd order
1073
                    q *= two_cos_w-lsp[j]; // one more time for q
1074

    
1075
                    /* final step and square */
1076
                    p *= p*(4.f-two_cos_w*two_cos_w);
1077
                    q *= q;
1078
                }
1079

    
1080
                /* calculate linear floor value */
1081
                {
1082
                    q=exp( (
1083
                             ( (amplitude*vf->amplitude_offset)/
1084
                               (((1<<vf->amplitude_bits)-1) * sqrt(p+q)) )
1085
                             - vf->amplitude_offset ) * .11512925f
1086
                         );
1087
                }
1088

    
1089
                /* fill vector */
1090
                do { vec[i]=q; ++i; }while(vf->map[blockflag][i]==iter_cond);
1091
            }
1092
        }
1093
    }
1094
    else {
1095
        /* this channel is unused */
1096
        return 1;
1097
    }
1098

    
1099
    AV_DEBUG(" Floor0 decoded\n");
1100

    
1101
    return 0;
1102
}
1103

    
1104
static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc, vorbis_floor_data *vfu, float *vec) {
1105
    vorbis_floor1 * vf=&vfu->t1;
1106
    GetBitContext *gb=&vc->gb;
1107
    uint_fast16_t range_v[4]={ 256, 128, 86, 64 };
1108
    uint_fast16_t range=range_v[vf->multiplier-1];
1109
    uint_fast16_t floor1_Y[vf->x_list_dim];
1110
    uint_fast16_t floor1_Y_final[vf->x_list_dim];
1111
    int floor1_flag[vf->x_list_dim];
1112
    uint_fast8_t class_;
1113
    uint_fast8_t cdim;
1114
    uint_fast8_t cbits;
1115
    uint_fast8_t csub;
1116
    uint_fast8_t cval;
1117
    int_fast16_t book;
1118
    uint_fast16_t offset;
1119
    uint_fast16_t i,j;
1120
    /*u*/int_fast16_t adx, ady, off, predicted; // WTF ? dy/adx= (unsigned)dy/adx ?
1121
    int_fast16_t dy, err;
1122

    
1123

    
1124
    if (!get_bits1(gb)) return 1; // silence
1125

    
1126
// Read values (or differences) for the floor's points
1127

    
1128
    floor1_Y[0]=get_bits(gb, ilog(range-1));
1129
    floor1_Y[1]=get_bits(gb, ilog(range-1));
1130

    
1131
    AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);
1132

    
1133
    offset=2;
1134
    for(i=0;i<vf->partitions;++i) {
1135
        class_=vf->partition_class[i];
1136
        cdim=vf->class_dimensions[class_];
1137
        cbits=vf->class_subclasses[class_];
1138
        csub=(1<<cbits)-1;
1139
        cval=0;
1140

    
1141
        AV_DEBUG("Cbits %d \n", cbits);
1142

    
1143
        if (cbits) { // this reads all subclasses for this partition's class
1144
            cval=get_vlc2(gb, vc->codebooks[vf->class_masterbook[class_]].vlc.table,
1145
            vc->codebooks[vf->class_masterbook[class_]].nb_bits, 3);
1146
        }
1147

    
1148
        for(j=0;j<cdim;++j) {
1149
            book=vf->subclass_books[class_][cval & csub];
1150

    
1151
            AV_DEBUG("book %d Cbits %d cval %d  bits:%d \n", book, cbits, cval, get_bits_count(gb));
1152

    
1153
            cval=cval>>cbits;
1154
            if (book>-1) {
1155
                floor1_Y[offset+j]=get_vlc2(gb, vc->codebooks[book].vlc.table,
1156
                vc->codebooks[book].nb_bits, 3);
1157
            } else {
1158
                floor1_Y[offset+j]=0;
1159
            }
1160

    
1161
            AV_DEBUG(" floor(%d) = %d \n", vf->list[offset+j].x, floor1_Y[offset+j]);
1162
        }
1163
        offset+=cdim;
1164
    }
1165

    
1166
// Amplitude calculation from the differences
1167

    
1168
    floor1_flag[0]=1;
1169
    floor1_flag[1]=1;
1170
    floor1_Y_final[0]=floor1_Y[0];
1171
    floor1_Y_final[1]=floor1_Y[1];
1172

    
1173
    for(i=2;i<vf->x_list_dim;++i) {
1174
        uint_fast16_t val, highroom, lowroom, room;
1175
        uint_fast16_t high_neigh_offs;
1176
        uint_fast16_t low_neigh_offs;
1177

    
1178
        low_neigh_offs=vf->list[i].low;
1179
        high_neigh_offs=vf->list[i].high;
1180
        dy=floor1_Y_final[high_neigh_offs]-floor1_Y_final[low_neigh_offs];  // render_point begin
1181
        adx=vf->list[high_neigh_offs].x-vf->list[low_neigh_offs].x;
1182
        ady= FFABS(dy);
1183
        err=ady*(vf->list[i].x-vf->list[low_neigh_offs].x);
1184
        off=(int16_t)err/(int16_t)adx;
1185
        if (dy<0) {
1186
            predicted=floor1_Y_final[low_neigh_offs]-off;
1187
        } else {
1188
            predicted=floor1_Y_final[low_neigh_offs]+off;
1189
        } // render_point end
1190

    
1191
        val=floor1_Y[i];
1192
        highroom=range-predicted;
1193
        lowroom=predicted;
1194
        if (highroom < lowroom) {
1195
            room=highroom*2;
1196
        } else {
1197
            room=lowroom*2;   // SPEC mispelling
1198
        }
1199
        if (val) {
1200
            floor1_flag[low_neigh_offs]=1;
1201
            floor1_flag[high_neigh_offs]=1;
1202
            floor1_flag[i]=1;
1203
            if (val>=room) {
1204
                if (highroom > lowroom) {
1205
                    floor1_Y_final[i]=val-lowroom+predicted;
1206
                } else {
1207
                    floor1_Y_final[i]=predicted-val+highroom-1;
1208
                }
1209
            } else {
1210
                if (val & 1) {
1211
                    floor1_Y_final[i]=predicted-(val+1)/2;
1212
                } else {
1213
                    floor1_Y_final[i]=predicted+val/2;
1214
                }
1215
            }
1216
        } else {
1217
            floor1_flag[i]=0;
1218
            floor1_Y_final[i]=predicted;
1219
        }
1220

    
1221
        AV_DEBUG(" Decoded floor(%d) = %d / val %d \n", vf->list[i].x, floor1_Y_final[i], val);
1222
    }
1223

    
1224
// Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?
1225

    
1226
    ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);
1227

    
1228
    AV_DEBUG(" Floor decoded\n");
1229

    
1230
    return 0;
1231
}
1232

    
1233
// Read and decode residue
1234

    
1235
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) {
1236
    GetBitContext *gb=&vc->gb;
1237
    uint_fast8_t c_p_c=vc->codebooks[vr->classbook].dimensions;
1238
    uint_fast16_t n_to_read=vr->end-vr->begin;
1239
    uint_fast16_t ptns_to_read=n_to_read/vr->partition_size;
1240
    uint_fast8_t classifs[ptns_to_read*vc->audio_channels];
1241
    uint_fast8_t pass;
1242
    uint_fast8_t ch_used;
1243
    uint_fast8_t i,j,l;
1244
    uint_fast16_t k;
1245

    
1246
    if (vr->type==2) {
1247
        for(j=1;j<ch;++j) {
1248
                do_not_decode[0]&=do_not_decode[j];  // FIXME - clobbering input
1249
        }
1250
        if (do_not_decode[0]) return 0;
1251
        ch_used=1;
1252
    } else {
1253
        ch_used=ch;
1254
    }
1255

    
1256
    AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);
1257

    
1258
    for(pass=0;pass<=vr->maxpass;++pass) { // FIXME OPTIMIZE?
1259
        uint_fast16_t voffset;
1260
        uint_fast16_t partition_count;
1261
        uint_fast16_t j_times_ptns_to_read;
1262

    
1263
        voffset=vr->begin;
1264
        for(partition_count=0;partition_count<ptns_to_read;) {  // SPEC        error
1265
            if (!pass) {
1266
                uint_fast32_t inverse_class = ff_inverse[vr->classifications];
1267
                for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {
1268
                    if (!do_not_decode[j]) {
1269
                        uint_fast32_t temp=get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,
1270
                        vc->codebooks[vr->classbook].nb_bits, 3);
1271

    
1272
                        AV_DEBUG("Classword: %d \n", temp);
1273

    
1274
                        assert(vr->classifications > 1 && temp<=65536); //needed for inverse[]
1275
                        for(i=0;i<c_p_c;++i) {
1276
                            uint_fast32_t temp2;
1277

    
1278
                            temp2=(((uint_fast64_t)temp) * inverse_class)>>32;
1279
                            if (partition_count+c_p_c-1-i < ptns_to_read) {
1280
                                classifs[j_times_ptns_to_read+partition_count+c_p_c-1-i]=temp-temp2*vr->classifications;
1281
                            }
1282
                            temp=temp2;
1283
                        }
1284
                    }
1285
                    j_times_ptns_to_read+=ptns_to_read;
1286
                }
1287
            }
1288
            for(i=0;(i<c_p_c) && (partition_count<ptns_to_read);++i) {
1289
                for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {
1290
                    uint_fast16_t voffs;
1291

    
1292
                    if (!do_not_decode[j]) {
1293
                        uint_fast8_t vqclass=classifs[j_times_ptns_to_read+partition_count];
1294
                        int_fast16_t vqbook=vr->books[vqclass][pass];
1295

    
1296
                        if (vqbook>=0 && vc->codebooks[vqbook].codevectors) {
1297
                            uint_fast16_t coffs;
1298
                            unsigned dim= vc->codebooks[vqbook].dimensions; // not uint_fast8_t: 64bit is slower here on amd64
1299
                            uint_fast16_t step= dim==1 ? vr->partition_size
1300
                                              : FASTDIV(vr->partition_size, dim);
1301
                            vorbis_codebook codebook= vc->codebooks[vqbook];
1302

    
1303
                            if (vr->type==0) {
1304

    
1305
                                voffs=voffset+j*vlen;
1306
                                for(k=0;k<step;++k) {
1307
                                    coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1308
                                    for(l=0;l<dim;++l) {
1309
                                        vec[voffs+k+l*step]+=codebook.codevectors[coffs+l];  // FPMATH
1310
                                    }
1311
                                }
1312
                            }
1313
                            else if (vr->type==1) {
1314
                                voffs=voffset+j*vlen;
1315
                                for(k=0;k<step;++k) {
1316
                                    coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1317
                                    for(l=0;l<dim;++l, ++voffs) {
1318
                                        vec[voffs]+=codebook.codevectors[coffs+l];  // FPMATH
1319

    
1320
                                        AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d  \n", pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);
1321
                                    }
1322
                                }
1323
                            }
1324
                            else if (vr->type==2 && ch==2 && (voffset&1)==0 && (dim&1)==0) { // most frequent case optimized
1325
                                voffs=voffset>>1;
1326

    
1327
                                if(dim==2) {
1328
                                    for(k=0;k<step;++k) {
1329
                                        coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;
1330
                                        vec[voffs+k     ]+=codebook.codevectors[coffs  ];  // FPMATH
1331
                                        vec[voffs+k+vlen]+=codebook.codevectors[coffs+1];  // FPMATH
1332
                                    }
1333
                                } else
1334
                                for(k=0;k<step;++k) {
1335
                                    coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1336
                                    for(l=0;l<dim;l+=2, voffs++) {
1337
                                        vec[voffs     ]+=codebook.codevectors[coffs+l  ];  // FPMATH
1338
                                        vec[voffs+vlen]+=codebook.codevectors[coffs+l+1];  // FPMATH
1339

    
1340
                                        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);
1341
                                    }
1342
                                }
1343

    
1344
                            }
1345
                            else if (vr->type==2) {
1346
                                voffs=voffset;
1347

    
1348
                                for(k=0;k<step;++k) {
1349
                                    coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1350
                                    for(l=0;l<dim;++l, ++voffs) {
1351
                                        vec[voffs/ch+(voffs%ch)*vlen]+=codebook.codevectors[coffs+l];  // FPMATH FIXME use if and counter instead of / and %
1352

    
1353
                                        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);
1354
                                    }
1355
                                }
1356
                            } else {
1357
                                av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");
1358
                                return 1;
1359
                            }
1360
                        }
1361
                    }
1362
                    j_times_ptns_to_read+=ptns_to_read;
1363
                }
1364
                ++partition_count;
1365
                voffset+=vr->partition_size;
1366
            }
1367
        }
1368
    }
1369
    return 0;
1370
}
1371

    
1372
void vorbis_inverse_coupling(float *mag, float *ang, int blocksize)
1373
{
1374
    int i;
1375
    for(i=0; i<blocksize; i++)
1376
    {
1377
        if (mag[i]>0.0) {
1378
            if (ang[i]>0.0) {
1379
                ang[i]=mag[i]-ang[i];
1380
            } else {
1381
                float temp=ang[i];
1382
                ang[i]=mag[i];
1383
                mag[i]+=temp;
1384
            }
1385
        } else {
1386
            if (ang[i]>0.0) {
1387
                ang[i]+=mag[i];
1388
            } else {
1389
                float temp=ang[i];
1390
                ang[i]=mag[i];
1391
                mag[i]-=temp;
1392
            }
1393
        }
1394
    }
1395
}
1396

    
1397
static void copy_normalize(float *dst, float *src, int len, int exp_bias, float add_bias)
1398
{
1399
    int i;
1400
    if(exp_bias) {
1401
        for(i=0; i<len; i++)
1402
            ((uint32_t*)dst)[i] = ((uint32_t*)src)[i] + exp_bias; // dst[k]=src[i]*(1<<bias)
1403
    } else {
1404
        for(i=0; i<len; i++)
1405
            dst[i] = src[i] + add_bias;
1406
    }
1407
}
1408

    
1409
// Decode the audio packet using the functions above
1410

    
1411
static int vorbis_parse_audio_packet(vorbis_context *vc) {
1412
    GetBitContext *gb=&vc->gb;
1413

    
1414
    uint_fast8_t previous_window=vc->previous_window;
1415
    uint_fast8_t mode_number;
1416
    uint_fast8_t blockflag;
1417
    uint_fast16_t blocksize;
1418
    int_fast32_t i,j;
1419
    uint_fast8_t no_residue[vc->audio_channels];
1420
    uint_fast8_t do_not_decode[vc->audio_channels];
1421
    vorbis_mapping *mapping;
1422
    float *ch_res_ptr=vc->channel_residues;
1423
    float *ch_floor_ptr=vc->channel_floors;
1424
    uint_fast8_t res_chan[vc->audio_channels];
1425
    uint_fast8_t res_num=0;
1426
    int_fast16_t retlen=0;
1427
    float fadd_bias = vc->add_bias;
1428

    
1429
    if (get_bits1(gb)) {
1430
        av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");
1431
        return -1; // packet type not audio
1432
    }
1433

    
1434
    if (vc->mode_count==1) {
1435
        mode_number=0;
1436
    } else {
1437
        mode_number=get_bits(gb, ilog(vc->mode_count-1));
1438
    }
1439
    vc->mode_number=mode_number;
1440
    mapping=&vc->mappings[vc->modes[mode_number].mapping];
1441

    
1442
    AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);
1443

    
1444
    blockflag=vc->modes[mode_number].blockflag;
1445
    blocksize=vc->blocksize[blockflag];
1446
    if (blockflag) {
1447
        skip_bits(gb, 2); // previous_window, next_window
1448
    }
1449

    
1450
    memset(ch_res_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?
1451
    memset(ch_floor_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?
1452

    
1453
// Decode floor
1454

    
1455
    for(i=0;i<vc->audio_channels;++i) {
1456
        vorbis_floor *floor;
1457
        if (mapping->submaps>1) {
1458
            floor=&vc->floors[mapping->submap_floor[mapping->mux[i]]];
1459
        } else {
1460
            floor=&vc->floors[mapping->submap_floor[0]];
1461
        }
1462

    
1463
        no_residue[i]=floor->decode(vc, &floor->data, ch_floor_ptr);
1464
        ch_floor_ptr+=blocksize/2;
1465
    }
1466

    
1467
// Nonzero vector propagate
1468

    
1469
    for(i=mapping->coupling_steps-1;i>=0;--i) {
1470
        if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {
1471
            no_residue[mapping->magnitude[i]]=0;
1472
            no_residue[mapping->angle[i]]=0;
1473
        }
1474
    }
1475

    
1476
// Decode residue
1477

    
1478
    for(i=0;i<mapping->submaps;++i) {
1479
        vorbis_residue *residue;
1480
        uint_fast8_t ch=0;
1481

    
1482
        for(j=0;j<vc->audio_channels;++j) {
1483
            if ((mapping->submaps==1) || (i=mapping->mux[j])) {
1484
                res_chan[j]=res_num;
1485
                if (no_residue[j]) {
1486
                    do_not_decode[ch]=1;
1487
                } else {
1488
                    do_not_decode[ch]=0;
1489
                }
1490
                ++ch;
1491
                ++res_num;
1492
            }
1493
        }
1494
        residue=&vc->residues[mapping->submap_residue[i]];
1495
        vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);
1496

    
1497
        ch_res_ptr+=ch*blocksize/2;
1498
    }
1499

    
1500
// Inverse coupling
1501

    
1502
    for(i=mapping->coupling_steps-1;i>=0;--i) { //warning: i has to be signed
1503
        float *mag, *ang;
1504

    
1505
        mag=vc->channel_residues+res_chan[mapping->magnitude[i]]*blocksize/2;
1506
        ang=vc->channel_residues+res_chan[mapping->angle[i]]*blocksize/2;
1507
        vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize/2);
1508
    }
1509

    
1510
// Dotproduct
1511

    
1512
    for(j=0, ch_floor_ptr=vc->channel_floors;j<vc->audio_channels;++j,ch_floor_ptr+=blocksize/2) {
1513
        ch_res_ptr=vc->channel_residues+res_chan[j]*blocksize/2;
1514
        vc->dsp.vector_fmul(ch_floor_ptr, ch_res_ptr, blocksize/2);
1515
    }
1516

    
1517
// MDCT, overlap/add, save data for next overlapping  FPMATH
1518

    
1519
    retlen = (blocksize + vc->blocksize[previous_window])/4;
1520
    for(j=0;j<vc->audio_channels;++j) {
1521
        uint_fast16_t bs0=vc->blocksize[0];
1522
        uint_fast16_t bs1=vc->blocksize[1];
1523
        float *saved=vc->saved+j*bs1/2;
1524
        float *ret=vc->ret+j*retlen;
1525
        float *buf=vc->buf;
1526
        const float *win=vc->win[blockflag&previous_window];
1527

    
1528
        vc->mdct[0].fft.imdct_calc(&vc->mdct[blockflag], buf, vc->channel_floors+j*blocksize/2, vc->buf_tmp);
1529

    
1530
        if(blockflag == previous_window) {
1531
            vc->dsp.vector_fmul_window(ret, saved, buf, win, fadd_bias, blocksize/2);
1532
        } else if(blockflag > previous_window) {
1533
            vc->dsp.vector_fmul_window(ret, saved, buf+(bs1-bs0)/4, win, fadd_bias, bs0/2);
1534
            copy_normalize(ret+bs0/2, buf+(bs1+bs0)/4, (bs1-bs0)/4, vc->exp_bias, fadd_bias);
1535
        } else {
1536
            copy_normalize(ret, saved, (bs1-bs0)/4, vc->exp_bias, fadd_bias);
1537
            vc->dsp.vector_fmul_window(ret+(bs1-bs0)/4, saved+(bs1-bs0)/4, buf, win, fadd_bias, bs0/2);
1538
        }
1539
        memcpy(saved, buf+blocksize/2, blocksize/2*sizeof(float));
1540
    }
1541

    
1542
    vc->previous_window = blockflag;
1543
    return retlen;
1544
}
1545

    
1546
// Return the decoded audio packet through the standard api
1547

    
1548
static int vorbis_decode_frame(AVCodecContext *avccontext,
1549
                        void *data, int *data_size,
1550
                        const uint8_t *buf, int buf_size)
1551
{
1552
    vorbis_context *vc = avccontext->priv_data ;
1553
    GetBitContext *gb = &(vc->gb);
1554

    
1555
    int_fast16_t len;
1556

    
1557
    if(!buf_size){
1558
        return 0;
1559
    }
1560

    
1561
    AV_DEBUG("packet length %d \n", buf_size);
1562

    
1563
    init_get_bits(gb, buf, buf_size*8);
1564

    
1565
    len=vorbis_parse_audio_packet(vc);
1566

    
1567
    if (len<=0) {
1568
        *data_size=0;
1569
        return buf_size;
1570
    }
1571

    
1572
    if (!vc->first_frame) {
1573
        vc->first_frame=1;
1574
        *data_size=0;
1575
        return buf_size ;
1576
    }
1577

    
1578
    AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);
1579

    
1580
    vc->dsp.float_to_int16_interleave(data, vc->ret, len, vc->audio_channels);
1581
    *data_size=len*2*vc->audio_channels;
1582

    
1583
    return buf_size ;
1584
}
1585

    
1586
// Close decoder
1587

    
1588
static av_cold int vorbis_decode_close(AVCodecContext *avccontext) {
1589
    vorbis_context *vc = avccontext->priv_data;
1590

    
1591
    vorbis_free(vc);
1592

    
1593
    return 0 ;
1594
}
1595

    
1596
AVCodec vorbis_decoder = {
1597
    "vorbis",
1598
    CODEC_TYPE_AUDIO,
1599
    CODEC_ID_VORBIS,
1600
    sizeof(vorbis_context),
1601
    vorbis_decode_init,
1602
    NULL,
1603
    vorbis_decode_close,
1604
    vorbis_decode_frame,
1605
    .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),
1606
};
1607