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1
/**
2
 * @file
3
 * Vorbis I decoder
4
 * @author Denes Balatoni  ( dbalatoni programozo hu )
5
 *
6
 * This file is part of Libav.
7
 *
8
 * Libav 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
 * Libav is distributed in the hope that it will be useful,
14
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16
 * Lesser General Public License for more details.
17
 *
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 * You should have received a copy of the GNU Lesser General Public
19
 * License along with Libav; 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
#include "fft.h"
34
#include "fmtconvert.h"
35

    
36
#include "vorbis.h"
37
#include "xiph.h"
38

    
39
#define V_NB_BITS 8
40
#define V_NB_BITS2 11
41
#define V_MAX_VLCS (1 << 16)
42
#define V_MAX_PARTITIONS (1 << 20)
43

    
44
#ifndef V_DEBUG
45
#define AV_DEBUG(...)
46
#endif
47

    
48
#undef NDEBUG
49
#include <assert.h>
50

    
51
typedef struct {
52
    uint_fast8_t dimensions;
53
    uint_fast8_t lookup_type;
54
    uint_fast8_t maxdepth;
55
    VLC vlc;
56
    float *codevectors;
57
    unsigned int nb_bits;
58
} vorbis_codebook;
59

    
60
typedef union  vorbis_floor_u  vorbis_floor_data;
61
typedef struct vorbis_floor0_s vorbis_floor0;
62
typedef struct vorbis_floor1_s vorbis_floor1;
63
struct vorbis_context_s;
64
typedef
65
int (* vorbis_floor_decode_func)
66
    (struct vorbis_context_s *, vorbis_floor_data *, float *);
67
typedef struct {
68
    uint_fast8_t floor_type;
69
    vorbis_floor_decode_func decode;
70
    union vorbis_floor_u {
71
        struct vorbis_floor0_s {
72
            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
            uint_fast8_t partitions;
85
            uint8_t      partition_class[32];
86
            uint_fast8_t class_dimensions[16];
87
            uint_fast8_t class_subclasses[16];
88
            uint_fast8_t class_masterbook[16];
89
            int_fast16_t subclass_books[16][8];
90
            uint_fast8_t multiplier;
91
            uint_fast16_t x_list_dim;
92
            vorbis_floor1_entry *list;
93
        } t1;
94
    } data;
95
} vorbis_floor;
96

    
97
typedef struct {
98
    uint_fast16_t type;
99
    uint_fast32_t begin;
100
    uint_fast32_t end;
101
    unsigned      partition_size;
102
    uint_fast8_t  classifications;
103
    uint_fast8_t  classbook;
104
    int_fast16_t  books[64][8];
105
    uint_fast8_t  maxpass;
106
    uint_fast16_t ptns_to_read;
107
    uint8_t *classifs;
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
    FmtConvertContext fmt_conv;
132

    
133
    FFTContext mdct[2];
134
    uint_fast8_t  first_frame;
135
    uint_fast32_t version;
136
    uint_fast8_t  audio_channels;
137
    uint_fast32_t audio_samplerate;
138
    uint_fast32_t bitrate_maximum;
139
    uint_fast32_t bitrate_nominal;
140
    uint_fast32_t bitrate_minimum;
141
    uint_fast32_t blocksize[2];
142
    const float  *win[2];
143
    uint_fast16_t codebook_count;
144
    vorbis_codebook *codebooks;
145
    uint_fast8_t  floor_count;
146
    vorbis_floor *floors;
147
    uint_fast8_t  residue_count;
148
    vorbis_residue *residues;
149
    uint_fast8_t  mapping_count;
150
    vorbis_mapping *mappings;
151
    uint_fast8_t  mode_count;
152
    vorbis_mode  *modes;
153
    uint_fast8_t  mode_number; // mode number for the current packet
154
    uint_fast8_t  previous_window;
155
    float        *channel_residues;
156
    float        *channel_floors;
157
    float        *saved;
158
    float         scale_bias; // for float->int conversion
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 const char idx_err_str[] = "Index value %d out of range (0 - %d) for %s at %s:%i\n";
167
#define VALIDATE_INDEX(idx, limit) \
168
    if (idx >= limit) {\
169
        av_log(vc->avccontext, AV_LOG_ERROR,\
170
               idx_err_str,\
171
               (int)(idx), (int)(limit - 1), #idx, __FILE__, __LINE__);\
172
        return -1;\
173
    }
174
#define GET_VALIDATED_INDEX(idx, bits, limit) \
175
    {\
176
        idx = get_bits(gb, bits);\
177
        VALIDATE_INDEX(idx, limit)\
178
    }
179

    
180
static float vorbisfloat2float(unsigned val)
181
{
182
    double mant = val & 0x1fffff;
183
    long exp    = (val & 0x7fe00000L) >> 21;
184
    if (val & 0x80000000)
185
        mant = -mant;
186
    return ldexp(mant, exp - 20 - 768);
187
}
188

    
189

    
190
// Free all allocated memory -----------------------------------------
191

    
192
static void vorbis_free(vorbis_context *vc)
193
{
194
    int i;
195

    
196
    av_freep(&vc->channel_residues);
197
    av_freep(&vc->channel_floors);
198
    av_freep(&vc->saved);
199

    
200
    for (i = 0; i < vc->residue_count; i++)
201
        av_free(vc->residues[i].classifs);
202
    av_freep(&vc->residues);
203
    av_freep(&vc->modes);
204

    
205
    ff_mdct_end(&vc->mdct[0]);
206
    ff_mdct_end(&vc->mdct[1]);
207

    
208
    for (i = 0; i < vc->codebook_count; ++i) {
209
        av_free(vc->codebooks[i].codevectors);
210
        free_vlc(&vc->codebooks[i].vlc);
211
    }
212
    av_freep(&vc->codebooks);
213

    
214
    for (i = 0; i < vc->floor_count; ++i) {
215
        if (vc->floors[i].floor_type == 0) {
216
            av_free(vc->floors[i].data.t0.map[0]);
217
            av_free(vc->floors[i].data.t0.map[1]);
218
            av_free(vc->floors[i].data.t0.book_list);
219
            av_free(vc->floors[i].data.t0.lsp);
220
        } else {
221
            av_free(vc->floors[i].data.t1.list);
222
        }
223
    }
224
    av_freep(&vc->floors);
225

    
226
    for (i = 0; i < vc->mapping_count; ++i) {
227
        av_free(vc->mappings[i].magnitude);
228
        av_free(vc->mappings[i].angle);
229
        av_free(vc->mappings[i].mux);
230
    }
231
    av_freep(&vc->mappings);
232
}
233

    
234
// Parse setup header -------------------------------------------------
235

    
236
// Process codebooks part
237

    
238
static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc)
239
{
240
    unsigned cb;
241
    uint8_t  *tmp_vlc_bits;
242
    uint32_t *tmp_vlc_codes;
243
    GetBitContext *gb = &vc->gb;
244
    uint_fast16_t *codebook_multiplicands;
245

    
246
    vc->codebook_count = get_bits(gb, 8) + 1;
247

    
248
    AV_DEBUG(" Codebooks: %d \n", vc->codebook_count);
249

    
250
    vc->codebooks = av_mallocz(vc->codebook_count * sizeof(*vc->codebooks));
251
    tmp_vlc_bits  = av_mallocz(V_MAX_VLCS * sizeof(*tmp_vlc_bits));
252
    tmp_vlc_codes = av_mallocz(V_MAX_VLCS * sizeof(*tmp_vlc_codes));
253
    codebook_multiplicands = av_malloc(V_MAX_VLCS * sizeof(*codebook_multiplicands));
254

    
255
    for (cb = 0; cb < vc->codebook_count; ++cb) {
256
        vorbis_codebook *codebook_setup = &vc->codebooks[cb];
257
        unsigned ordered, t, entries, used_entries = 0;
258

    
259
        AV_DEBUG(" %u. Codebook\n", cb);
260

    
261
        if (get_bits(gb, 24) != 0x564342) {
262
            av_log(vc->avccontext, AV_LOG_ERROR,
263
                   " %u. Codebook setup data corrupt.\n", cb);
264
            goto error;
265
        }
266

    
267
        codebook_setup->dimensions=get_bits(gb, 16);
268
        if (codebook_setup->dimensions > 16 || codebook_setup->dimensions == 0) {
269
            av_log(vc->avccontext, AV_LOG_ERROR,
270
                   " %u. Codebook's dimension is invalid (%d).\n",
271
                   cb, codebook_setup->dimensions);
272
            goto error;
273
        }
274
        entries = get_bits(gb, 24);
275
        if (entries > V_MAX_VLCS) {
276
            av_log(vc->avccontext, AV_LOG_ERROR,
277
                   " %u. Codebook has too many entries (%u).\n",
278
                   cb, entries);
279
            goto error;
280
        }
281

    
282
        ordered = get_bits1(gb);
283

    
284
        AV_DEBUG(" codebook_dimensions %d, codebook_entries %u\n",
285
                 codebook_setup->dimensions, entries);
286

    
287
        if (!ordered) {
288
            unsigned ce, flag;
289
            unsigned sparse = get_bits1(gb);
290

    
291
            AV_DEBUG(" not ordered \n");
292

    
293
            if (sparse) {
294
                AV_DEBUG(" sparse \n");
295

    
296
                used_entries = 0;
297
                for (ce = 0; ce < entries; ++ce) {
298
                    flag = get_bits1(gb);
299
                    if (flag) {
300
                        tmp_vlc_bits[ce] = get_bits(gb, 5) + 1;
301
                        ++used_entries;
302
                    } else
303
                        tmp_vlc_bits[ce] = 0;
304
                }
305
            } else {
306
                AV_DEBUG(" not sparse \n");
307

    
308
                used_entries = entries;
309
                for (ce = 0; ce < entries; ++ce)
310
                    tmp_vlc_bits[ce] = get_bits(gb, 5) + 1;
311
            }
312
        } else {
313
            unsigned current_entry  = 0;
314
            unsigned current_length = get_bits(gb, 5) + 1;
315

    
316
            AV_DEBUG(" ordered, current length: %u\n", current_length);  //FIXME
317

    
318
            used_entries = entries;
319
            for (; current_entry < used_entries && current_length <= 32; ++current_length) {
320
                unsigned i, number;
321

    
322
                AV_DEBUG(" number bits: %u ", ilog(entries - current_entry));
323

    
324
                number = get_bits(gb, ilog(entries - current_entry));
325

    
326
                AV_DEBUG(" number: %u\n", number);
327

    
328
                for (i = current_entry; i < number+current_entry; ++i)
329
                    if (i < used_entries)
330
                        tmp_vlc_bits[i] = current_length;
331

    
332
                current_entry+=number;
333
            }
334
            if (current_entry>used_entries) {
335
                av_log(vc->avccontext, AV_LOG_ERROR, " More codelengths than codes in codebook. \n");
336
                goto error;
337
            }
338
        }
339

    
340
        codebook_setup->lookup_type = get_bits(gb, 4);
341

    
342
        AV_DEBUG(" lookup type: %d : %s \n", codebook_setup->lookup_type, codebook_setup->lookup_type ? "vq" : "no lookup");
343

    
344
// If the codebook is used for (inverse) VQ, calculate codevectors.
345

    
346
        if (codebook_setup->lookup_type == 1) {
347
            unsigned i, j, k;
348
            unsigned codebook_lookup_values = ff_vorbis_nth_root(entries, codebook_setup->dimensions);
349

    
350
            float codebook_minimum_value = vorbisfloat2float(get_bits_long(gb, 32));
351
            float codebook_delta_value   = vorbisfloat2float(get_bits_long(gb, 32));
352
            unsigned codebook_value_bits = get_bits(gb, 4) + 1;
353
            unsigned codebook_sequence_p = get_bits1(gb);
354

    
355
            AV_DEBUG(" We expect %d numbers for building the codevectors. \n", codebook_lookup_values);
356
            AV_DEBUG("  delta %f minmum %f \n", codebook_delta_value, codebook_minimum_value);
357

    
358
            for (i = 0; i < codebook_lookup_values; ++i) {
359
                codebook_multiplicands[i] = get_bits(gb, codebook_value_bits);
360

    
361
                AV_DEBUG(" multiplicands*delta+minmum : %e \n", (float)codebook_multiplicands[i]*codebook_delta_value+codebook_minimum_value);
362
                AV_DEBUG(" multiplicand %d \n", codebook_multiplicands[i]);
363
            }
364

    
365
// Weed out unused vlcs and build codevector vector
366
            codebook_setup->codevectors = used_entries ? av_mallocz(used_entries *
367
                                                                    codebook_setup->dimensions *
368
                                                                    sizeof(*codebook_setup->codevectors))
369
                                                       : NULL;
370
            for (j = 0, i = 0; i < entries; ++i) {
371
                unsigned dim = codebook_setup->dimensions;
372

    
373
                if (tmp_vlc_bits[i]) {
374
                    float last = 0.0;
375
                    unsigned lookup_offset = i;
376

    
377
#ifdef V_DEBUG
378
                    av_log(vc->avccontext, AV_LOG_INFO, "Lookup offset %u ,", i);
379
#endif
380

    
381
                    for (k = 0; k < dim; ++k) {
382
                        unsigned multiplicand_offset = lookup_offset % codebook_lookup_values;
383
                        codebook_setup->codevectors[j * dim + k] = codebook_multiplicands[multiplicand_offset] * codebook_delta_value + codebook_minimum_value + last;
384
                        if (codebook_sequence_p)
385
                            last = codebook_setup->codevectors[j * dim + k];
386
                        lookup_offset/=codebook_lookup_values;
387
                    }
388
                    tmp_vlc_bits[j] = tmp_vlc_bits[i];
389

    
390
#ifdef V_DEBUG
391
                    av_log(vc->avccontext, AV_LOG_INFO, "real lookup offset %u, vector: ", j);
392
                    for (k = 0; k < dim; ++k)
393
                        av_log(vc->avccontext, AV_LOG_INFO, " %f ", codebook_setup->codevectors[j * dim + k]);
394
                    av_log(vc->avccontext, AV_LOG_INFO, "\n");
395
#endif
396

    
397
                    ++j;
398
                }
399
            }
400
            if (j != used_entries) {
401
                av_log(vc->avccontext, AV_LOG_ERROR, "Bug in codevector vector building code. \n");
402
                goto error;
403
            }
404
            entries = used_entries;
405
        } else if (codebook_setup->lookup_type >= 2) {
406
            av_log(vc->avccontext, AV_LOG_ERROR, "Codebook lookup type not supported. \n");
407
            goto error;
408
        }
409

    
410
// Initialize VLC table
411
        if (ff_vorbis_len2vlc(tmp_vlc_bits, tmp_vlc_codes, entries)) {
412
            av_log(vc->avccontext, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");
413
            goto error;
414
        }
415
        codebook_setup->maxdepth = 0;
416
        for (t = 0; t < entries; ++t)
417
            if (tmp_vlc_bits[t] >= codebook_setup->maxdepth)
418
                codebook_setup->maxdepth = tmp_vlc_bits[t];
419

    
420
        if (codebook_setup->maxdepth > 3 * V_NB_BITS)
421
            codebook_setup->nb_bits = V_NB_BITS2;
422
        else
423
            codebook_setup->nb_bits = V_NB_BITS;
424

    
425
        codebook_setup->maxdepth = (codebook_setup->maxdepth+codebook_setup->nb_bits - 1) / codebook_setup->nb_bits;
426

    
427
        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)) {
428
            av_log(vc->avccontext, AV_LOG_ERROR, " Error generating vlc tables. \n");
429
            goto error;
430
        }
431
    }
432

    
433
    av_free(tmp_vlc_bits);
434
    av_free(tmp_vlc_codes);
435
    av_free(codebook_multiplicands);
436
    return 0;
437

    
438
// Error:
439
error:
440
    av_free(tmp_vlc_bits);
441
    av_free(tmp_vlc_codes);
442
    av_free(codebook_multiplicands);
443
    return -1;
444
}
445

    
446
// Process time domain transforms part (unused in Vorbis I)
447

    
448
static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc)
449
{
450
    GetBitContext *gb = &vc->gb;
451
    unsigned i, vorbis_time_count = get_bits(gb, 6) + 1;
452

    
453
    for (i = 0; i < vorbis_time_count; ++i) {
454
        unsigned vorbis_tdtransform = get_bits(gb, 16);
455

    
456
        AV_DEBUG(" Vorbis time domain transform %u: %u\n",
457
                 vorbis_time_count, vorbis_tdtransform);
458

    
459
        if (vorbis_tdtransform) {
460
            av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n");
461
            return -1;
462
        }
463
    }
464
    return 0;
465
}
466

    
467
// Process floors part
468

    
469
static int vorbis_floor0_decode(vorbis_context *vc,
470
                                vorbis_floor_data *vfu, float *vec);
471
static void create_map(vorbis_context *vc, unsigned floor_number);
472
static int vorbis_floor1_decode(vorbis_context *vc,
473
                                vorbis_floor_data *vfu, float *vec);
474
static int vorbis_parse_setup_hdr_floors(vorbis_context *vc)
475
{
476
    GetBitContext *gb = &vc->gb;
477
    int i,j,k;
478

    
479
    vc->floor_count = get_bits(gb, 6) + 1;
480

    
481
    vc->floors = av_mallocz(vc->floor_count * sizeof(*vc->floors));
482

    
483
    for (i = 0; i < vc->floor_count; ++i) {
484
        vorbis_floor *floor_setup = &vc->floors[i];
485

    
486
        floor_setup->floor_type = get_bits(gb, 16);
487

    
488
        AV_DEBUG(" %d. floor type %d \n", i, floor_setup->floor_type);
489

    
490
        if (floor_setup->floor_type == 1) {
491
            int maximum_class = -1;
492
            unsigned rangebits, rangemax, floor1_values = 2;
493

    
494
            floor_setup->decode = vorbis_floor1_decode;
495

    
496
            floor_setup->data.t1.partitions = get_bits(gb, 5);
497

    
498
            AV_DEBUG(" %d.floor: %d partitions \n", i, floor_setup->data.t1.partitions);
499

    
500
            for (j = 0; j < floor_setup->data.t1.partitions; ++j) {
501
                floor_setup->data.t1.partition_class[j] = get_bits(gb, 4);
502
                if (floor_setup->data.t1.partition_class[j] > maximum_class)
503
                    maximum_class = floor_setup->data.t1.partition_class[j];
504

    
505
                AV_DEBUG(" %d. floor %d partition class %d \n", i, j, floor_setup->data.t1.partition_class[j]);
506

    
507
            }
508

    
509
            AV_DEBUG(" maximum class %d \n", maximum_class);
510

    
511
            for (j = 0; j <= maximum_class; ++j) {
512
                floor_setup->data.t1.class_dimensions[j] = get_bits(gb, 3) + 1;
513
                floor_setup->data.t1.class_subclasses[j] = get_bits(gb, 2);
514

    
515
                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]);
516

    
517
                if (floor_setup->data.t1.class_subclasses[j]) {
518
                    GET_VALIDATED_INDEX(floor_setup->data.t1.class_masterbook[j], 8, vc->codebook_count)
519

    
520
                    AV_DEBUG("   masterbook: %d \n", floor_setup->data.t1.class_masterbook[j]);
521
                }
522

    
523
                for (k = 0; k < (1 << floor_setup->data.t1.class_subclasses[j]); ++k) {
524
                    int16_t bits = get_bits(gb, 8) - 1;
525
                    if (bits != -1)
526
                        VALIDATE_INDEX(bits, vc->codebook_count)
527
                    floor_setup->data.t1.subclass_books[j][k] = bits;
528

    
529
                    AV_DEBUG("    book %d. : %d \n", k, floor_setup->data.t1.subclass_books[j][k]);
530
                }
531
            }
532

    
533
            floor_setup->data.t1.multiplier = get_bits(gb, 2) + 1;
534
            floor_setup->data.t1.x_list_dim = 2;
535

    
536
            for (j = 0; j < floor_setup->data.t1.partitions; ++j)
537
                floor_setup->data.t1.x_list_dim+=floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];
538

    
539
            floor_setup->data.t1.list = av_mallocz(floor_setup->data.t1.x_list_dim *
540
                                                   sizeof(*floor_setup->data.t1.list));
541

    
542

    
543
            rangebits = get_bits(gb, 4);
544
            rangemax = (1 << rangebits);
545
            if (rangemax > vc->blocksize[1] / 2) {
546
                av_log(vc->avccontext, AV_LOG_ERROR,
547
                       "Floor value is too large for blocksize: %u (%"PRIuFAST32")\n",
548
                       rangemax, vc->blocksize[1] / 2);
549
                return -1;
550
            }
551
            floor_setup->data.t1.list[0].x = 0;
552
            floor_setup->data.t1.list[1].x = rangemax;
553

    
554
            for (j = 0; j < floor_setup->data.t1.partitions; ++j) {
555
                for (k = 0; k < floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]]; ++k, ++floor1_values) {
556
                    floor_setup->data.t1.list[floor1_values].x = get_bits(gb, rangebits);
557

    
558
                    AV_DEBUG(" %u. floor1 Y coord. %d\n", floor1_values,
559
                             floor_setup->data.t1.list[floor1_values].x);
560
                }
561
            }
562

    
563
// Precalculate order of x coordinates - needed for decode
564
            ff_vorbis_ready_floor1_list(floor_setup->data.t1.list, floor_setup->data.t1.x_list_dim);
565
        } else if (floor_setup->floor_type == 0) {
566
            unsigned max_codebook_dim = 0;
567

    
568
            floor_setup->decode = vorbis_floor0_decode;
569

    
570
            floor_setup->data.t0.order          = get_bits(gb,  8);
571
            floor_setup->data.t0.rate           = get_bits(gb, 16);
572
            floor_setup->data.t0.bark_map_size  = get_bits(gb, 16);
573
            floor_setup->data.t0.amplitude_bits = get_bits(gb,  6);
574
            /* zero would result in a div by zero later *
575
             * 2^0 - 1 == 0                             */
576
            if (floor_setup->data.t0.amplitude_bits == 0) {
577
                av_log(vc->avccontext, AV_LOG_ERROR,
578
                       "Floor 0 amplitude bits is 0.\n");
579
                return -1;
580
            }
581
            floor_setup->data.t0.amplitude_offset = get_bits(gb, 8);
582
            floor_setup->data.t0.num_books        = get_bits(gb, 4) + 1;
583

    
584
            /* allocate mem for booklist */
585
            floor_setup->data.t0.book_list =
586
                av_malloc(floor_setup->data.t0.num_books);
587
            if (!floor_setup->data.t0.book_list)
588
                return -1;
589
            /* read book indexes */
590
            {
591
                int idx;
592
                unsigned book_idx;
593
                for (idx = 0; idx < floor_setup->data.t0.num_books; ++idx) {
594
                    GET_VALIDATED_INDEX(book_idx, 8, vc->codebook_count)
595
                    floor_setup->data.t0.book_list[idx] = book_idx;
596
                    if (vc->codebooks[book_idx].dimensions > max_codebook_dim)
597
                        max_codebook_dim = vc->codebooks[book_idx].dimensions;
598
                }
599
            }
600

    
601
            create_map(vc, i);
602

    
603
            /* codebook dim is for padding if codebook dim doesn't *
604
             * divide order+1 then we need to read more data       */
605
            floor_setup->data.t0.lsp =
606
                av_malloc((floor_setup->data.t0.order + 1 + max_codebook_dim)
607
                          * sizeof(*floor_setup->data.t0.lsp));
608
            if (!floor_setup->data.t0.lsp)
609
                return -1;
610

    
611
#ifdef V_DEBUG /* debug output parsed headers */
612
            AV_DEBUG("floor0 order: %u\n", floor_setup->data.t0.order);
613
            AV_DEBUG("floor0 rate: %u\n", floor_setup->data.t0.rate);
614
            AV_DEBUG("floor0 bark map size: %u\n",
615
                     floor_setup->data.t0.bark_map_size);
616
            AV_DEBUG("floor0 amplitude bits: %u\n",
617
                     floor_setup->data.t0.amplitude_bits);
618
            AV_DEBUG("floor0 amplitude offset: %u\n",
619
                     floor_setup->data.t0.amplitude_offset);
620
            AV_DEBUG("floor0 number of books: %u\n",
621
                     floor_setup->data.t0.num_books);
622
            AV_DEBUG("floor0 book list pointer: %p\n",
623
                     floor_setup->data.t0.book_list);
624
            {
625
                int idx;
626
                for (idx = 0; idx < floor_setup->data.t0.num_books; ++idx) {
627
                    AV_DEBUG("  Book %d: %u\n",
628
                             idx+1,
629
                             floor_setup->data.t0.book_list[idx]);
630
                }
631
            }
632
#endif
633
        } else {
634
            av_log(vc->avccontext, AV_LOG_ERROR, "Invalid floor type!\n");
635
            return -1;
636
        }
637
    }
638
    return 0;
639
}
640

    
641
// Process residues part
642

    
643
static int vorbis_parse_setup_hdr_residues(vorbis_context *vc)
644
{
645
    GetBitContext *gb = &vc->gb;
646
    unsigned i, j, k;
647

    
648
    vc->residue_count = get_bits(gb, 6)+1;
649
    vc->residues      = av_mallocz(vc->residue_count * sizeof(*vc->residues));
650

    
651
    AV_DEBUG(" There are %d residues. \n", vc->residue_count);
652

    
653
    for (i = 0; i < vc->residue_count; ++i) {
654
        vorbis_residue *res_setup = &vc->residues[i];
655
        uint_fast8_t cascade[64];
656
        unsigned high_bits, low_bits;
657

    
658
        res_setup->type = get_bits(gb, 16);
659

    
660
        AV_DEBUG(" %u. residue type %d\n", i, res_setup->type);
661

    
662
        res_setup->begin          = get_bits(gb, 24);
663
        res_setup->end            = get_bits(gb, 24);
664
        res_setup->partition_size = get_bits(gb, 24) + 1;
665
        /* Validations to prevent a buffer overflow later. */
666
        if (res_setup->begin>res_setup->end ||
667
            res_setup->end > vc->avccontext->channels * vc->blocksize[1] / 2 ||
668
            (res_setup->end-res_setup->begin) / res_setup->partition_size > V_MAX_PARTITIONS) {
669
            av_log(vc->avccontext, AV_LOG_ERROR, "partition out of bounds: type, begin, end, size, blocksize: %"PRIdFAST16", %"PRIdFAST32", %"PRIdFAST32", %u, %"PRIdFAST32"\n", res_setup->type, res_setup->begin, res_setup->end, res_setup->partition_size, vc->blocksize[1] / 2);
670
            return -1;
671
        }
672

    
673
        res_setup->classifications = get_bits(gb, 6) + 1;
674
        GET_VALIDATED_INDEX(res_setup->classbook, 8, vc->codebook_count)
675

    
676
        res_setup->ptns_to_read =
677
            (res_setup->end - res_setup->begin) / res_setup->partition_size;
678
        res_setup->classifs = av_malloc(res_setup->ptns_to_read *
679
                                        vc->audio_channels *
680
                                        sizeof(*res_setup->classifs));
681
        if (!res_setup->classifs)
682
            return AVERROR(ENOMEM);
683

    
684
        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,
685
          res_setup->classifications, res_setup->classbook);
686

    
687
        for (j = 0; j < res_setup->classifications; ++j) {
688
            high_bits = 0;
689
            low_bits  = get_bits(gb, 3);
690
            if (get_bits1(gb))
691
                high_bits = get_bits(gb, 5);
692
            cascade[j] = (high_bits << 3) + low_bits;
693

    
694
            AV_DEBUG("     %u class cascade depth: %d\n", j, ilog(cascade[j]));
695
        }
696

    
697
        res_setup->maxpass = 0;
698
        for (j = 0; j < res_setup->classifications; ++j) {
699
            for (k = 0; k < 8; ++k) {
700
                if (cascade[j]&(1 << k)) {
701
                    GET_VALIDATED_INDEX(res_setup->books[j][k], 8, vc->codebook_count)
702

    
703
                    AV_DEBUG("     %u class cascade depth %u book: %d\n",
704
                             j, k, res_setup->books[j][k]);
705

    
706
                    if (k>res_setup->maxpass)
707
                        res_setup->maxpass = k;
708
                } else {
709
                    res_setup->books[j][k] = -1;
710
                }
711
            }
712
        }
713
    }
714
    return 0;
715
}
716

    
717
// Process mappings part
718

    
719
static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc)
720
{
721
    GetBitContext *gb = &vc->gb;
722
    unsigned i, j;
723

    
724
    vc->mapping_count = get_bits(gb, 6)+1;
725
    vc->mappings      = av_mallocz(vc->mapping_count * sizeof(*vc->mappings));
726

    
727
    AV_DEBUG(" There are %d mappings. \n", vc->mapping_count);
728

    
729
    for (i = 0; i < vc->mapping_count; ++i) {
730
        vorbis_mapping *mapping_setup = &vc->mappings[i];
731

    
732
        if (get_bits(gb, 16)) {
733
            av_log(vc->avccontext, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n");
734
            return -1;
735
        }
736
        if (get_bits1(gb)) {
737
            mapping_setup->submaps = get_bits(gb, 4) + 1;
738
        } else {
739
            mapping_setup->submaps = 1;
740
        }
741

    
742
        if (get_bits1(gb)) {
743
            mapping_setup->coupling_steps = get_bits(gb, 8) + 1;
744
            mapping_setup->magnitude      = av_mallocz(mapping_setup->coupling_steps *
745
                                                       sizeof(*mapping_setup->magnitude));
746
            mapping_setup->angle          = av_mallocz(mapping_setup->coupling_steps *
747
                                                       sizeof(*mapping_setup->angle));
748
            for (j = 0; j < mapping_setup->coupling_steps; ++j) {
749
                GET_VALIDATED_INDEX(mapping_setup->magnitude[j], ilog(vc->audio_channels - 1), vc->audio_channels)
750
                GET_VALIDATED_INDEX(mapping_setup->angle[j],     ilog(vc->audio_channels - 1), vc->audio_channels)
751
            }
752
        } else {
753
            mapping_setup->coupling_steps = 0;
754
        }
755

    
756
        AV_DEBUG("   %u mapping coupling steps: %d\n",
757
                 i, mapping_setup->coupling_steps);
758

    
759
        if (get_bits(gb, 2)) {
760
            av_log(vc->avccontext, AV_LOG_ERROR, "%u. mapping setup data invalid.\n", i);
761
            return -1; // following spec.
762
        }
763

    
764
        if (mapping_setup->submaps>1) {
765
            mapping_setup->mux = av_mallocz(vc->audio_channels *
766
                                            sizeof(*mapping_setup->mux));
767
            for (j = 0; j < vc->audio_channels; ++j)
768
                mapping_setup->mux[j] = get_bits(gb, 4);
769
        }
770

    
771
        for (j = 0; j < mapping_setup->submaps; ++j) {
772
            skip_bits(gb, 8); // FIXME check?
773
            GET_VALIDATED_INDEX(mapping_setup->submap_floor[j],   8, vc->floor_count)
774
            GET_VALIDATED_INDEX(mapping_setup->submap_residue[j], 8, vc->residue_count)
775

    
776
            AV_DEBUG("   %u mapping %u submap : floor %d, residue %d\n",
777
                     i, j,
778
                     mapping_setup->submap_floor[j],
779
                     mapping_setup->submap_residue[j]);
780
        }
781
    }
782
    return 0;
783
}
784

    
785
// Process modes part
786

    
787
static void create_map(vorbis_context *vc, unsigned floor_number)
788
{
789
    vorbis_floor *floors = vc->floors;
790
    vorbis_floor0 *vf;
791
    int idx;
792
    int blockflag, n;
793
    int_fast32_t *map;
794

    
795
    for (blockflag = 0; blockflag < 2; ++blockflag) {
796
        n = vc->blocksize[blockflag] / 2;
797
        floors[floor_number].data.t0.map[blockflag] =
798
            av_malloc((n+1) * sizeof(int_fast32_t)); // n + sentinel
799

    
800
        map =  floors[floor_number].data.t0.map[blockflag];
801
        vf  = &floors[floor_number].data.t0;
802

    
803
        for (idx = 0; idx < n; ++idx) {
804
            map[idx] = floor(BARK((vf->rate * idx) / (2.0f * n)) *
805
                             ((vf->bark_map_size) /
806
                              BARK(vf->rate / 2.0f)));
807
            if (vf->bark_map_size-1 < map[idx])
808
                map[idx] = vf->bark_map_size - 1;
809
        }
810
        map[n] = -1;
811
        vf->map_size[blockflag] = n;
812
    }
813

    
814
#ifdef V_DEBUG
815
    for (idx = 0; idx <= n; ++idx) {
816
        AV_DEBUG("floor0 map: map at pos %d is %d\n",
817
                 idx, map[idx]);
818
    }
819
#endif
820
}
821

    
822
static int vorbis_parse_setup_hdr_modes(vorbis_context *vc)
823
{
824
    GetBitContext *gb = &vc->gb;
825
    unsigned i;
826

    
827
    vc->mode_count = get_bits(gb, 6) + 1;
828
    vc->modes      = av_mallocz(vc->mode_count * sizeof(*vc->modes));
829

    
830
    AV_DEBUG(" There are %d modes.\n", vc->mode_count);
831

    
832
    for (i = 0; i < vc->mode_count; ++i) {
833
        vorbis_mode *mode_setup = &vc->modes[i];
834

    
835
        mode_setup->blockflag     = get_bits1(gb);
836
        mode_setup->windowtype    = get_bits(gb, 16); //FIXME check
837
        mode_setup->transformtype = get_bits(gb, 16); //FIXME check
838
        GET_VALIDATED_INDEX(mode_setup->mapping, 8, vc->mapping_count);
839

    
840
        AV_DEBUG(" %u mode: blockflag %d, windowtype %d, transformtype %d, mapping %d\n",
841
                 i, mode_setup->blockflag, mode_setup->windowtype,
842
                 mode_setup->transformtype, mode_setup->mapping);
843
    }
844
    return 0;
845
}
846

    
847
// Process the whole setup header using the functions above
848

    
849
static int vorbis_parse_setup_hdr(vorbis_context *vc)
850
{
851
    GetBitContext *gb = &vc->gb;
852

    
853
    if ((get_bits(gb, 8) != 'v') || (get_bits(gb, 8) != 'o') ||
854
        (get_bits(gb, 8) != 'r') || (get_bits(gb, 8) != 'b') ||
855
        (get_bits(gb, 8) != 'i') || (get_bits(gb, 8) != 's')) {
856
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n");
857
        return -1;
858
    }
859

    
860
    if (vorbis_parse_setup_hdr_codebooks(vc)) {
861
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n");
862
        return -2;
863
    }
864
    if (vorbis_parse_setup_hdr_tdtransforms(vc)) {
865
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n");
866
        return -3;
867
    }
868
    if (vorbis_parse_setup_hdr_floors(vc)) {
869
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n");
870
        return -4;
871
    }
872
    if (vorbis_parse_setup_hdr_residues(vc)) {
873
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n");
874
        return -5;
875
    }
876
    if (vorbis_parse_setup_hdr_mappings(vc)) {
877
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n");
878
        return -6;
879
    }
880
    if (vorbis_parse_setup_hdr_modes(vc)) {
881
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n");
882
        return -7;
883
    }
884
    if (!get_bits1(gb)) {
885
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n");
886
        return -8; // framing flag bit unset error
887
    }
888

    
889
    return 0;
890
}
891

    
892
// Process the identification header
893

    
894
static int vorbis_parse_id_hdr(vorbis_context *vc)
895
{
896
    GetBitContext *gb = &vc->gb;
897
    unsigned bl0, bl1;
898

    
899
    if ((get_bits(gb, 8) != 'v') || (get_bits(gb, 8) != 'o') ||
900
        (get_bits(gb, 8) != 'r') || (get_bits(gb, 8) != 'b') ||
901
        (get_bits(gb, 8) != 'i') || (get_bits(gb, 8) != 's')) {
902
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n");
903
        return -1;
904
    }
905

    
906
    vc->version        = get_bits_long(gb, 32);    //FIXME check 0
907
    vc->audio_channels = get_bits(gb, 8);
908
    if (vc->audio_channels <= 0) {
909
        av_log(vc->avccontext, AV_LOG_ERROR, "Invalid number of channels\n");
910
        return -1;
911
    }
912
    vc->audio_samplerate = get_bits_long(gb, 32);
913
    if (vc->audio_samplerate <= 0) {
914
        av_log(vc->avccontext, AV_LOG_ERROR, "Invalid samplerate\n");
915
        return -1;
916
    }
917
    vc->bitrate_maximum = get_bits_long(gb, 32);
918
    vc->bitrate_nominal = get_bits_long(gb, 32);
919
    vc->bitrate_minimum = get_bits_long(gb, 32);
920
    bl0 = get_bits(gb, 4);
921
    bl1 = get_bits(gb, 4);
922
    vc->blocksize[0] = (1 << bl0);
923
    vc->blocksize[1] = (1 << bl1);
924
    if (bl0 > 13 || bl0 < 6 || bl1 > 13 || bl1 < 6 || bl1 < bl0) {
925
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n");
926
        return -3;
927
    }
928
    // output format int16
929
    if (vc->blocksize[1] / 2 * vc->audio_channels * 2 > AVCODEC_MAX_AUDIO_FRAME_SIZE) {
930
        av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis channel count makes "
931
               "output packets too large.\n");
932
        return -4;
933
    }
934
    vc->win[0] = ff_vorbis_vwin[bl0 - 6];
935
    vc->win[1] = ff_vorbis_vwin[bl1 - 6];
936

    
937
    if ((get_bits1(gb)) == 0) {
938
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n");
939
        return -2;
940
    }
941

    
942
    vc->channel_residues =  av_malloc((vc->blocksize[1]  / 2) * vc->audio_channels * sizeof(*vc->channel_residues));
943
    vc->channel_floors   =  av_malloc((vc->blocksize[1]  / 2) * vc->audio_channels * sizeof(*vc->channel_floors));
944
    vc->saved            =  av_mallocz((vc->blocksize[1] / 4) * vc->audio_channels * sizeof(*vc->saved));
945
    vc->previous_window  = 0;
946

    
947
    ff_mdct_init(&vc->mdct[0], bl0, 1, -vc->scale_bias);
948
    ff_mdct_init(&vc->mdct[1], bl1, 1, -vc->scale_bias);
949

    
950
    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 ",
951
            vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize[0], vc->blocksize[1]);
952

    
953
/*
954
    BLK = vc->blocksize[0];
955
    for (i = 0; i < BLK / 2; ++i) {
956
        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)));
957
    }
958
*/
959

    
960
    return 0;
961
}
962

    
963
// Process the extradata using the functions above (identification header, setup header)
964

    
965
static av_cold int vorbis_decode_init(AVCodecContext *avccontext)
966
{
967
    vorbis_context *vc = avccontext->priv_data ;
968
    uint8_t *headers   = avccontext->extradata;
969
    int headers_len    = avccontext->extradata_size;
970
    uint8_t *header_start[3];
971
    int header_len[3];
972
    GetBitContext *gb = &(vc->gb);
973
    int hdr_type;
974

    
975
    vc->avccontext = avccontext;
976
    dsputil_init(&vc->dsp, avccontext);
977
    ff_fmt_convert_init(&vc->fmt_conv, avccontext);
978

    
979
    vc->scale_bias = 32768.0f;
980

    
981
    if (!headers_len) {
982
        av_log(avccontext, AV_LOG_ERROR, "Extradata missing.\n");
983
        return -1;
984
    }
985

    
986
    if (ff_split_xiph_headers(headers, headers_len, 30, header_start, header_len) < 0) {
987
        av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
988
        return -1;
989
    }
990

    
991
    init_get_bits(gb, header_start[0], header_len[0]*8);
992
    hdr_type = get_bits(gb, 8);
993
    if (hdr_type != 1) {
994
        av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n");
995
        return -1;
996
    }
997
    if (vorbis_parse_id_hdr(vc)) {
998
        av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n");
999
        vorbis_free(vc);
1000
        return -1;
1001
    }
1002

    
1003
    init_get_bits(gb, header_start[2], header_len[2]*8);
1004
    hdr_type = get_bits(gb, 8);
1005
    if (hdr_type != 5) {
1006
        av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");
1007
        vorbis_free(vc);
1008
        return -1;
1009
    }
1010
    if (vorbis_parse_setup_hdr(vc)) {
1011
        av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");
1012
        vorbis_free(vc);
1013
        return -1;
1014
    }
1015

    
1016
    if (vc->audio_channels > 8)
1017
        avccontext->channel_layout = 0;
1018
    else
1019
        avccontext->channel_layout = ff_vorbis_channel_layouts[vc->audio_channels - 1];
1020

    
1021
    avccontext->channels    = vc->audio_channels;
1022
    avccontext->sample_rate = vc->audio_samplerate;
1023
    avccontext->frame_size  = FFMIN(vc->blocksize[0], vc->blocksize[1]) >> 2;
1024
    avccontext->sample_fmt  = AV_SAMPLE_FMT_S16;
1025

    
1026
    return 0 ;
1027
}
1028

    
1029
// Decode audiopackets -------------------------------------------------
1030

    
1031
// Read and decode floor
1032

    
1033
static int vorbis_floor0_decode(vorbis_context *vc,
1034
                                vorbis_floor_data *vfu, float *vec)
1035
{
1036
    vorbis_floor0 *vf = &vfu->t0;
1037
    float *lsp = vf->lsp;
1038
    unsigned amplitude, book_idx;
1039
    unsigned blockflag = vc->modes[vc->mode_number].blockflag;
1040

    
1041
    amplitude = get_bits(&vc->gb, vf->amplitude_bits);
1042
    if (amplitude > 0) {
1043
        float last = 0;
1044
        unsigned idx, lsp_len = 0;
1045
        vorbis_codebook codebook;
1046

    
1047
        book_idx = get_bits(&vc->gb, ilog(vf->num_books));
1048
        if (book_idx >= vf->num_books) {
1049
            av_log(vc->avccontext, AV_LOG_ERROR,
1050
                    "floor0 dec: booknumber too high!\n");
1051
            book_idx =  0;
1052
        }
1053
        AV_DEBUG("floor0 dec: booknumber: %u\n", book_idx);
1054
        codebook = vc->codebooks[vf->book_list[book_idx]];
1055
        /* Invalid codebook! */
1056
        if (!codebook.codevectors)
1057
            return -1;
1058

    
1059
        while (lsp_len<vf->order) {
1060
            int vec_off;
1061

    
1062
            AV_DEBUG("floor0 dec: book dimension: %d\n", codebook.dimensions);
1063
            AV_DEBUG("floor0 dec: maximum depth: %d\n", codebook.maxdepth);
1064
            /* read temp vector */
1065
            vec_off = get_vlc2(&vc->gb, codebook.vlc.table,
1066
                               codebook.nb_bits, codebook.maxdepth)
1067
                      * codebook.dimensions;
1068
            AV_DEBUG("floor0 dec: vector offset: %d\n", vec_off);
1069
            /* copy each vector component and add last to it */
1070
            for (idx = 0; idx < codebook.dimensions; ++idx)
1071
                lsp[lsp_len+idx] = codebook.codevectors[vec_off+idx] + last;
1072
            last = lsp[lsp_len+idx-1]; /* set last to last vector component */
1073

    
1074
            lsp_len += codebook.dimensions;
1075
        }
1076
#ifdef V_DEBUG
1077
        /* DEBUG: output lsp coeffs */
1078
        {
1079
            int idx;
1080
            for (idx = 0; idx < lsp_len; ++idx)
1081
                AV_DEBUG("floor0 dec: coeff at %d is %f\n", idx, lsp[idx]);
1082
        }
1083
#endif
1084

    
1085
        /* synthesize floor output vector */
1086
        {
1087
            int i;
1088
            int order = vf->order;
1089
            float wstep = M_PI / vf->bark_map_size;
1090

    
1091
            for (i = 0; i < order; i++)
1092
                lsp[i] = 2.0f * cos(lsp[i]);
1093

    
1094
            AV_DEBUG("floor0 synth: map_size = %d; m = %d; wstep = %f\n",
1095
                     vf->map_size, order, wstep);
1096

    
1097
            i = 0;
1098
            while (i < vf->map_size[blockflag]) {
1099
                int j, iter_cond = vf->map[blockflag][i];
1100
                float p = 0.5f;
1101
                float q = 0.5f;
1102
                float two_cos_w = 2.0f * cos(wstep * iter_cond); // needed all times
1103

    
1104
                /* similar part for the q and p products */
1105
                for (j = 0; j + 1 < order; j += 2) {
1106
                    q *= lsp[j]     - two_cos_w;
1107
                    p *= lsp[j + 1] - two_cos_w;
1108
                }
1109
                if (j == order) { // even order
1110
                    p *= p * (2.0f - two_cos_w);
1111
                    q *= q * (2.0f + two_cos_w);
1112
                } else { // odd order
1113
                    q *= two_cos_w-lsp[j]; // one more time for q
1114

    
1115
                    /* final step and square */
1116
                    p *= p * (4.f - two_cos_w * two_cos_w);
1117
                    q *= q;
1118
                }
1119

    
1120
                /* calculate linear floor value */
1121
                q = exp((((amplitude*vf->amplitude_offset) /
1122
                          (((1 << vf->amplitude_bits) - 1) * sqrt(p + q)))
1123
                         - vf->amplitude_offset) * .11512925f);
1124

    
1125
                /* fill vector */
1126
                do {
1127
                    vec[i] = q; ++i;
1128
                } while (vf->map[blockflag][i] == iter_cond);
1129
            }
1130
        }
1131
    } else {
1132
        /* this channel is unused */
1133
        return 1;
1134
    }
1135

    
1136
    AV_DEBUG(" Floor0 decoded\n");
1137

    
1138
    return 0;
1139
}
1140

    
1141
static int vorbis_floor1_decode(vorbis_context *vc,
1142
                                vorbis_floor_data *vfu, float *vec)
1143
{
1144
    vorbis_floor1 *vf = &vfu->t1;
1145
    GetBitContext *gb = &vc->gb;
1146
    uint_fast16_t range_v[4] = { 256, 128, 86, 64 };
1147
    unsigned range = range_v[vf->multiplier-1];
1148
    uint_fast16_t floor1_Y[258];
1149
    uint_fast16_t floor1_Y_final[258];
1150
    int floor1_flag[258];
1151
    unsigned class, cdim, cbits, csub, cval, offset, i, j;
1152
    int book, adx, ady, dy, off, predicted, err;
1153

    
1154

    
1155
    if (!get_bits1(gb)) // silence
1156
        return 1;
1157

    
1158
// Read values (or differences) for the floor's points
1159

    
1160
    floor1_Y[0] = get_bits(gb, ilog(range - 1));
1161
    floor1_Y[1] = get_bits(gb, ilog(range - 1));
1162

    
1163
    AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);
1164

    
1165
    offset = 2;
1166
    for (i = 0; i < vf->partitions; ++i) {
1167
        class = vf->partition_class[i];
1168
        cdim   = vf->class_dimensions[class];
1169
        cbits  = vf->class_subclasses[class];
1170
        csub = (1 << cbits) - 1;
1171
        cval = 0;
1172

    
1173
        AV_DEBUG("Cbits %u\n", cbits);
1174

    
1175
        if (cbits) // this reads all subclasses for this partition's class
1176
            cval = get_vlc2(gb, vc->codebooks[vf->class_masterbook[class]].vlc.table,
1177
                            vc->codebooks[vf->class_masterbook[class]].nb_bits, 3);
1178

    
1179
        for (j = 0; j < cdim; ++j) {
1180
            book = vf->subclass_books[class][cval & csub];
1181

    
1182
            AV_DEBUG("book %d Cbits %u cval %u  bits:%d\n",
1183
                     book, cbits, cval, get_bits_count(gb));
1184

    
1185
            cval = cval >> cbits;
1186
            if (book > -1) {
1187
                floor1_Y[offset+j] = get_vlc2(gb, vc->codebooks[book].vlc.table,
1188
                vc->codebooks[book].nb_bits, 3);
1189
            } else {
1190
                floor1_Y[offset+j] = 0;
1191
            }
1192

    
1193
            AV_DEBUG(" floor(%d) = %d \n", vf->list[offset+j].x, floor1_Y[offset+j]);
1194
        }
1195
        offset+=cdim;
1196
    }
1197

    
1198
// Amplitude calculation from the differences
1199

    
1200
    floor1_flag[0] = 1;
1201
    floor1_flag[1] = 1;
1202
    floor1_Y_final[0] = floor1_Y[0];
1203
    floor1_Y_final[1] = floor1_Y[1];
1204

    
1205
    for (i = 2; i < vf->x_list_dim; ++i) {
1206
        unsigned val, highroom, lowroom, room, high_neigh_offs, low_neigh_offs;
1207

    
1208
        low_neigh_offs  = vf->list[i].low;
1209
        high_neigh_offs = vf->list[i].high;
1210
        dy  = floor1_Y_final[high_neigh_offs] - floor1_Y_final[low_neigh_offs];  // render_point begin
1211
        adx = vf->list[high_neigh_offs].x - vf->list[low_neigh_offs].x;
1212
        ady = FFABS(dy);
1213
        err = ady * (vf->list[i].x - vf->list[low_neigh_offs].x);
1214
        off = err / adx;
1215
        if (dy < 0) {
1216
            predicted = floor1_Y_final[low_neigh_offs] - off;
1217
        } else {
1218
            predicted = floor1_Y_final[low_neigh_offs] + off;
1219
        } // render_point end
1220

    
1221
        val = floor1_Y[i];
1222
        highroom = range-predicted;
1223
        lowroom  = predicted;
1224
        if (highroom < lowroom) {
1225
            room = highroom * 2;
1226
        } else {
1227
            room = lowroom * 2;   // SPEC mispelling
1228
        }
1229
        if (val) {
1230
            floor1_flag[low_neigh_offs]  = 1;
1231
            floor1_flag[high_neigh_offs] = 1;
1232
            floor1_flag[i]               = 1;
1233
            if (val >= room) {
1234
                if (highroom > lowroom) {
1235
                    floor1_Y_final[i] = val - lowroom + predicted;
1236
                } else {
1237
                    floor1_Y_final[i] = predicted - val + highroom - 1;
1238
                }
1239
            } else {
1240
                if (val & 1) {
1241
                    floor1_Y_final[i] = predicted - (val + 1) / 2;
1242
                } else {
1243
                    floor1_Y_final[i] = predicted + val / 2;
1244
                }
1245
            }
1246
        } else {
1247
            floor1_flag[i]    = 0;
1248
            floor1_Y_final[i] = predicted;
1249
        }
1250

    
1251
        AV_DEBUG(" Decoded floor(%d) = %d / val %u\n",
1252
                 vf->list[i].x, floor1_Y_final[i], val);
1253
    }
1254

    
1255
// Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?
1256

    
1257
    ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);
1258

    
1259
    AV_DEBUG(" Floor decoded\n");
1260

    
1261
    return 0;
1262
}
1263

    
1264
// Read and decode residue
1265

    
1266
static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc,
1267
                                                           vorbis_residue *vr,
1268
                                                           unsigned ch,
1269
                                                           uint_fast8_t *do_not_decode,
1270
                                                           float *vec,
1271
                                                           unsigned vlen,
1272
                                                           int vr_type)
1273
{
1274
    GetBitContext *gb = &vc->gb;
1275
    unsigned c_p_c        = vc->codebooks[vr->classbook].dimensions;
1276
    unsigned ptns_to_read = vr->ptns_to_read;
1277
    uint8_t *classifs = vr->classifs;
1278
    unsigned pass, ch_used, i, j, k, l;
1279

    
1280
    if (vr_type == 2) {
1281
        for (j = 1; j < ch; ++j)
1282
            do_not_decode[0] &= do_not_decode[j];  // FIXME - clobbering input
1283
        if (do_not_decode[0])
1284
            return 0;
1285
        ch_used = 1;
1286
    } else {
1287
        ch_used = ch;
1288
    }
1289

    
1290
    AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);
1291

    
1292
    for (pass = 0; pass <= vr->maxpass; ++pass) { // FIXME OPTIMIZE?
1293
        uint16_t voffset, partition_count, j_times_ptns_to_read;
1294

    
1295
        voffset = vr->begin;
1296
        for (partition_count = 0; partition_count < ptns_to_read;) {  // SPEC        error
1297
            if (!pass) {
1298
                unsigned inverse_class = ff_inverse[vr->classifications];
1299
                for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {
1300
                    if (!do_not_decode[j]) {
1301
                        unsigned temp = get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,
1302
                                                 vc->codebooks[vr->classbook].nb_bits, 3);
1303

    
1304
                        AV_DEBUG("Classword: %u\n", temp);
1305

    
1306
                        assert(vr->classifications > 1 && temp <= 65536); //needed for inverse[]
1307
                        for (i = 0; i < c_p_c; ++i) {
1308
                            unsigned temp2;
1309

    
1310
                            temp2 = (((uint64_t)temp) * inverse_class) >> 32;
1311
                            if (partition_count + c_p_c - 1 - i < ptns_to_read)
1312
                                classifs[j_times_ptns_to_read + partition_count + c_p_c - 1 - i] = temp - temp2 * vr->classifications;
1313
                            temp = temp2;
1314
                        }
1315
                    }
1316
                    j_times_ptns_to_read += ptns_to_read;
1317
                }
1318
            }
1319
            for (i = 0; (i < c_p_c) && (partition_count < ptns_to_read); ++i) {
1320
                for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {
1321
                    unsigned voffs;
1322

    
1323
                    if (!do_not_decode[j]) {
1324
                        unsigned vqclass = classifs[j_times_ptns_to_read + partition_count];
1325
                        int vqbook  = vr->books[vqclass][pass];
1326

    
1327
                        if (vqbook >= 0 && vc->codebooks[vqbook].codevectors) {
1328
                            unsigned coffs;
1329
                            unsigned dim  = vc->codebooks[vqbook].dimensions;
1330
                            unsigned step = dim == 1 ? vr->partition_size
1331
                                                     : FASTDIV(vr->partition_size, dim);
1332
                            vorbis_codebook codebook = vc->codebooks[vqbook];
1333

    
1334
                            if (vr_type == 0) {
1335

    
1336
                                voffs = voffset+j*vlen;
1337
                                for (k = 0; k < step; ++k) {
1338
                                    coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1339
                                    for (l = 0; l < dim; ++l)
1340
                                        vec[voffs + k + l * step] += codebook.codevectors[coffs + l];  // FPMATH
1341
                                }
1342
                            } else if (vr_type == 1) {
1343
                                voffs = voffset + j * vlen;
1344
                                for (k = 0; k < step; ++k) {
1345
                                    coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1346
                                    for (l = 0; l < dim; ++l, ++voffs) {
1347
                                        vec[voffs]+=codebook.codevectors[coffs+l];  // FPMATH
1348

    
1349
                                        AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d  \n", pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);
1350
                                    }
1351
                                }
1352
                            } else if (vr_type == 2 && ch == 2 && (voffset & 1) == 0 && (dim & 1) == 0) { // most frequent case optimized
1353
                                voffs = voffset >> 1;
1354

    
1355
                                if (dim == 2) {
1356
                                    for (k = 0; k < step; ++k) {
1357
                                        coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;
1358
                                        vec[voffs + k       ] += codebook.codevectors[coffs    ];  // FPMATH
1359
                                        vec[voffs + k + vlen] += codebook.codevectors[coffs + 1];  // FPMATH
1360
                                    }
1361
                                } else if (dim == 4) {
1362
                                    for (k = 0; k < step; ++k, voffs += 2) {
1363
                                        coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4;
1364
                                        vec[voffs           ] += codebook.codevectors[coffs    ];  // FPMATH
1365
                                        vec[voffs + 1       ] += codebook.codevectors[coffs + 2];  // FPMATH
1366
                                        vec[voffs + vlen    ] += codebook.codevectors[coffs + 1];  // FPMATH
1367
                                        vec[voffs + vlen + 1] += codebook.codevectors[coffs + 3];  // FPMATH
1368
                                    }
1369
                                } else
1370
                                for (k = 0; k < step; ++k) {
1371
                                    coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1372
                                    for (l = 0; l < dim; l += 2, voffs++) {
1373
                                        vec[voffs       ] += codebook.codevectors[coffs + l    ];  // FPMATH
1374
                                        vec[voffs + vlen] += codebook.codevectors[coffs + l + 1];  // FPMATH
1375

    
1376
                                        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);
1377
                                    }
1378
                                }
1379

    
1380
                            } else if (vr_type == 2) {
1381
                                voffs = voffset;
1382

    
1383
                                for (k = 0; k < step; ++k) {
1384
                                    coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1385
                                    for (l = 0; l < dim; ++l, ++voffs) {
1386
                                        vec[voffs / ch + (voffs % ch) * vlen] += codebook.codevectors[coffs + l];  // FPMATH FIXME use if and counter instead of / and %
1387

    
1388
                                        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);
1389
                                    }
1390
                                }
1391
                            }
1392
                        }
1393
                    }
1394
                    j_times_ptns_to_read += ptns_to_read;
1395
                }
1396
                ++partition_count;
1397
                voffset += vr->partition_size;
1398
            }
1399
        }
1400
    }
1401
    return 0;
1402
}
1403

    
1404
static inline int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr,
1405
                                        unsigned ch,
1406
                                        uint_fast8_t *do_not_decode,
1407
                                        float *vec, unsigned vlen)
1408
{
1409
    if (vr->type == 2)
1410
        return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 2);
1411
    else if (vr->type == 1)
1412
        return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 1);
1413
    else if (vr->type == 0)
1414
        return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 0);
1415
    else {
1416
        av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");
1417
        return -1;
1418
    }
1419
}
1420

    
1421
void vorbis_inverse_coupling(float *mag, float *ang, int blocksize)
1422
{
1423
    int i;
1424
    for (i = 0;  i < blocksize;  i++) {
1425
        if (mag[i] > 0.0) {
1426
            if (ang[i] > 0.0) {
1427
                ang[i] = mag[i] - ang[i];
1428
            } else {
1429
                float temp = ang[i];
1430
                ang[i]     = mag[i];
1431
                mag[i]    += temp;
1432
            }
1433
        } else {
1434
            if (ang[i] > 0.0) {
1435
                ang[i] += mag[i];
1436
            } else {
1437
                float temp = ang[i];
1438
                ang[i]     = mag[i];
1439
                mag[i]    -= temp;
1440
            }
1441
        }
1442
    }
1443
}
1444

    
1445
// Decode the audio packet using the functions above
1446

    
1447
static int vorbis_parse_audio_packet(vorbis_context *vc)
1448
{
1449
    GetBitContext *gb = &vc->gb;
1450
    FFTContext *mdct;
1451
    unsigned previous_window = vc->previous_window;
1452
    unsigned mode_number, blockflag, blocksize;
1453
    int i, j;
1454
    uint_fast8_t no_residue[255];
1455
    uint_fast8_t do_not_decode[255];
1456
    vorbis_mapping *mapping;
1457
    float *ch_res_ptr   = vc->channel_residues;
1458
    float *ch_floor_ptr = vc->channel_floors;
1459
    uint_fast8_t res_chan[255];
1460
    unsigned res_num = 0;
1461
    int retlen  = 0;
1462

    
1463
    if (get_bits1(gb)) {
1464
        av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");
1465
        return -1; // packet type not audio
1466
    }
1467

    
1468
    if (vc->mode_count == 1) {
1469
        mode_number = 0;
1470
    } else {
1471
        GET_VALIDATED_INDEX(mode_number, ilog(vc->mode_count-1), vc->mode_count)
1472
    }
1473
    vc->mode_number = mode_number;
1474
    mapping = &vc->mappings[vc->modes[mode_number].mapping];
1475

    
1476
    AV_DEBUG(" Mode number: %u , mapping: %d , blocktype %d\n", mode_number,
1477
             vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);
1478

    
1479
    blockflag = vc->modes[mode_number].blockflag;
1480
    blocksize = vc->blocksize[blockflag];
1481
    if (blockflag)
1482
        skip_bits(gb, 2); // previous_window, next_window
1483

    
1484
    memset(ch_res_ptr,   0, sizeof(float) * vc->audio_channels * blocksize / 2); //FIXME can this be removed ?
1485
    memset(ch_floor_ptr, 0, sizeof(float) * vc->audio_channels * blocksize / 2); //FIXME can this be removed ?
1486

    
1487
// Decode floor
1488

    
1489
    for (i = 0; i < vc->audio_channels; ++i) {
1490
        vorbis_floor *floor;
1491
        int ret;
1492
        if (mapping->submaps > 1) {
1493
            floor = &vc->floors[mapping->submap_floor[mapping->mux[i]]];
1494
        } else {
1495
            floor = &vc->floors[mapping->submap_floor[0]];
1496
        }
1497

    
1498
        ret = floor->decode(vc, &floor->data, ch_floor_ptr);
1499

    
1500
        if (ret < 0) {
1501
            av_log(vc->avccontext, AV_LOG_ERROR, "Invalid codebook in vorbis_floor_decode.\n");
1502
            return -1;
1503
        }
1504
        no_residue[i] = ret;
1505
        ch_floor_ptr += blocksize / 2;
1506
    }
1507

    
1508
// Nonzero vector propagate
1509

    
1510
    for (i = mapping->coupling_steps - 1; i >= 0; --i) {
1511
        if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {
1512
            no_residue[mapping->magnitude[i]] = 0;
1513
            no_residue[mapping->angle[i]]     = 0;
1514
        }
1515
    }
1516

    
1517
// Decode residue
1518

    
1519
    for (i = 0; i < mapping->submaps; ++i) {
1520
        vorbis_residue *residue;
1521
        unsigned ch = 0;
1522

    
1523
        for (j = 0; j < vc->audio_channels; ++j) {
1524
            if ((mapping->submaps == 1) || (i == mapping->mux[j])) {
1525
                res_chan[j] = res_num;
1526
                if (no_residue[j]) {
1527
                    do_not_decode[ch] = 1;
1528
                } else {
1529
                    do_not_decode[ch] = 0;
1530
                }
1531
                ++ch;
1532
                ++res_num;
1533
            }
1534
        }
1535
        residue = &vc->residues[mapping->submap_residue[i]];
1536
        vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);
1537

    
1538
        ch_res_ptr += ch * blocksize / 2;
1539
    }
1540

    
1541
// Inverse coupling
1542

    
1543
    for (i = mapping->coupling_steps - 1; i >= 0; --i) { //warning: i has to be signed
1544
        float *mag, *ang;
1545

    
1546
        mag = vc->channel_residues+res_chan[mapping->magnitude[i]] * blocksize / 2;
1547
        ang = vc->channel_residues+res_chan[mapping->angle[i]]     * blocksize / 2;
1548
        vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize / 2);
1549
    }
1550

    
1551
// Dotproduct, MDCT
1552

    
1553
    mdct = &vc->mdct[blockflag];
1554

    
1555
    for (j = vc->audio_channels-1;j >= 0; j--) {
1556
        ch_floor_ptr = vc->channel_floors   + j           * blocksize / 2;
1557
        ch_res_ptr   = vc->channel_residues + res_chan[j] * blocksize / 2;
1558
        vc->dsp.vector_fmul(ch_floor_ptr, ch_floor_ptr, ch_res_ptr, blocksize / 2);
1559
        mdct->imdct_half(mdct, ch_res_ptr, ch_floor_ptr);
1560
    }
1561

    
1562
// Overlap/add, save data for next overlapping  FPMATH
1563

    
1564
    retlen = (blocksize + vc->blocksize[previous_window]) / 4;
1565
    for (j = 0; j < vc->audio_channels; j++) {
1566
        unsigned bs0 = vc->blocksize[0];
1567
        unsigned bs1 = vc->blocksize[1];
1568
        float *residue    = vc->channel_residues + res_chan[j] * blocksize / 2;
1569
        float *saved      = vc->saved + j * bs1 / 4;
1570
        float *ret        = vc->channel_floors + j * retlen;
1571
        float *buf        = residue;
1572
        const float *win  = vc->win[blockflag & previous_window];
1573

    
1574
        if (blockflag == previous_window) {
1575
            vc->dsp.vector_fmul_window(ret, saved, buf, win, blocksize / 4);
1576
        } else if (blockflag > previous_window) {
1577
            vc->dsp.vector_fmul_window(ret, saved, buf, win, bs0 / 4);
1578
            memcpy(ret+bs0/2, buf+bs0/4, ((bs1-bs0)/4) * sizeof(float));
1579
        } else {
1580
            memcpy(ret, saved, ((bs1 - bs0) / 4) * sizeof(float));
1581
            vc->dsp.vector_fmul_window(ret + (bs1 - bs0) / 4, saved + (bs1 - bs0) / 4, buf, win, bs0 / 4);
1582
        }
1583
        memcpy(saved, buf + blocksize / 4, blocksize / 4 * sizeof(float));
1584
    }
1585

    
1586
    vc->previous_window = blockflag;
1587
    return retlen;
1588
}
1589

    
1590
// Return the decoded audio packet through the standard api
1591

    
1592
static int vorbis_decode_frame(AVCodecContext *avccontext,
1593
                               void *data, int *data_size,
1594
                               AVPacket *avpkt)
1595
{
1596
    const uint8_t *buf = avpkt->data;
1597
    int buf_size       = avpkt->size;
1598
    vorbis_context *vc = avccontext->priv_data ;
1599
    GetBitContext *gb = &(vc->gb);
1600
    const float *channel_ptrs[255];
1601
    int i, len;
1602

    
1603
    if (!buf_size)
1604
        return 0;
1605

    
1606
    AV_DEBUG("packet length %d \n", buf_size);
1607

    
1608
    init_get_bits(gb, buf, buf_size*8);
1609

    
1610
    len = vorbis_parse_audio_packet(vc);
1611

    
1612
    if (len <= 0) {
1613
        *data_size = 0;
1614
        return buf_size;
1615
    }
1616

    
1617
    if (!vc->first_frame) {
1618
        vc->first_frame = 1;
1619
        *data_size = 0;
1620
        return buf_size ;
1621
    }
1622

    
1623
    AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);
1624

    
1625
    if (vc->audio_channels > 8) {
1626
        for (i = 0; i < vc->audio_channels; i++)
1627
            channel_ptrs[i] = vc->channel_floors + i * len;
1628
    } else {
1629
        for (i = 0; i < vc->audio_channels; i++)
1630
            channel_ptrs[i] = vc->channel_floors +
1631
                              len * ff_vorbis_channel_layout_offsets[vc->audio_channels - 1][i];
1632
    }
1633

    
1634
    vc->fmt_conv.float_to_int16_interleave(data, channel_ptrs, len,
1635
                                           vc->audio_channels);
1636
    *data_size = len * 2 * vc->audio_channels;
1637

    
1638
    return buf_size ;
1639
}
1640

    
1641
// Close decoder
1642

    
1643
static av_cold int vorbis_decode_close(AVCodecContext *avccontext)
1644
{
1645
    vorbis_context *vc = avccontext->priv_data;
1646

    
1647
    vorbis_free(vc);
1648

    
1649
    return 0 ;
1650
}
1651

    
1652
AVCodec ff_vorbis_decoder = {
1653
    "vorbis",
1654
    AVMEDIA_TYPE_AUDIO,
1655
    CODEC_ID_VORBIS,
1656
    sizeof(vorbis_context),
1657
    vorbis_decode_init,
1658
    NULL,
1659
    vorbis_decode_close,
1660
    vorbis_decode_frame,
1661
    .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),
1662
    .channel_layouts = ff_vorbis_channel_layouts,
1663
};
1664