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ffmpeg / libavcodec / vorbis_dec.c @ 015f9f1a

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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 FFmpeg.
7
 *
8
 * FFmpeg is free software; you can redistribute it and/or
9
 * modify it under the terms of the GNU Lesser General Public
10
 * License as published by the Free Software Foundation; either
11
 * version 2.1 of the License, or (at your option) any later version.
12
 *
13
 * FFmpeg is distributed in the hope that it will be useful,
14
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16
 * Lesser General Public License for more details.
17
 *
18
 * You should have received a copy of the GNU Lesser General Public
19
 * License along with FFmpeg; if not, write to the Free Software
20
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21
 */
22

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

    
27
#include <math.h>
28

    
29
#define ALT_BITSTREAM_READER_LE
30
#include "avcodec.h"
31
#include "get_bits.h"
32
#include "dsputil.h"
33
#include "fft.h"
34

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

    
38
#define V_NB_BITS 8
39
#define V_NB_BITS2 11
40
#define V_MAX_VLCS (1 << 16)
41
#define V_MAX_PARTITIONS (1 << 20)
42

    
43
#ifndef V_DEBUG
44
#define AV_DEBUG(...)
45
#endif
46

    
47
#undef NDEBUG
48
#include <assert.h>
49

    
50
typedef struct {
51
    uint_fast8_t dimensions;
52
    uint_fast8_t lookup_type;
53
    uint_fast8_t maxdepth;
54
    VLC vlc;
55
    float *codevectors;
56
    unsigned int nb_bits;
57
} vorbis_codebook;
58

    
59
typedef union  vorbis_floor_u  vorbis_floor_data;
60
typedef struct vorbis_floor0_s vorbis_floor0;
61
typedef struct vorbis_floor1_s vorbis_floor1;
62
struct vorbis_context_s;
63
typedef
64
int (* vorbis_floor_decode_func)
65
    (struct vorbis_context_s *, vorbis_floor_data *, float *);
66
typedef struct {
67
    uint_fast8_t floor_type;
68
    vorbis_floor_decode_func decode;
69
    union vorbis_floor_u {
70
        struct vorbis_floor0_s {
71
            uint_fast8_t  order;
72
            uint_fast16_t rate;
73
            uint_fast16_t bark_map_size;
74
            int_fast32_t *map[2];
75
            uint_fast32_t map_size[2];
76
            uint_fast8_t  amplitude_bits;
77
            uint_fast8_t  amplitude_offset;
78
            uint_fast8_t  num_books;
79
            uint_fast8_t *book_list;
80
            float        *lsp;
81
        } t0;
82
        struct vorbis_floor1_s {
83
            uint_fast8_t partitions;
84
            uint8_t      partition_class[32];
85
            uint_fast8_t class_dimensions[16];
86
            uint_fast8_t class_subclasses[16];
87
            uint_fast8_t class_masterbook[16];
88
            int_fast16_t subclass_books[16][8];
89
            uint_fast8_t multiplier;
90
            uint_fast16_t x_list_dim;
91
            vorbis_floor1_entry *list;
92
        } t1;
93
    } data;
94
} vorbis_floor;
95

    
96
typedef struct {
97
    uint_fast16_t type;
98
    uint_fast32_t begin;
99
    uint_fast32_t end;
100
    unsigned      partition_size;
101
    uint_fast8_t  classifications;
102
    uint_fast8_t  classbook;
103
    int_fast16_t  books[64][8];
104
    uint_fast8_t  maxpass;
105
    uint_fast16_t ptns_to_read;
106
    uint8_t *classifs;
107
} vorbis_residue;
108

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

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

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

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

    
160
/* Helper functions */
161

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

    
165
static const char idx_err_str[] = "Index value %d out of range (0 - %d) for %s at %s:%i\n";
166
#define VALIDATE_INDEX(idx, limit) \
167
    if (idx >= limit) {\
168
        av_log(vc->avccontext, AV_LOG_ERROR,\
169
               idx_err_str,\
170
               (int)(idx), (int)(limit - 1), #idx, __FILE__, __LINE__);\
171
        return -1;\
172
    }
173
#define GET_VALIDATED_INDEX(idx, bits, limit) \
174
    {\
175
        idx = get_bits(gb, bits);\
176
        VALIDATE_INDEX(idx, limit)\
177
    }
178

    
179
static float vorbisfloat2float(uint_fast32_t val)
180
{
181
    double mant = val & 0x1fffff;
182
    long exp    = (val & 0x7fe00000L) >> 21;
183
    if (val & 0x80000000)
184
        mant = -mant;
185
    return ldexp(mant, exp - 20 - 768);
186
}
187

    
188

    
189
// Free all allocated memory -----------------------------------------
190

    
191
static void vorbis_free(vorbis_context *vc)
192
{
193
    int_fast16_t i;
194

    
195
    av_freep(&vc->channel_residues);
196
    av_freep(&vc->channel_floors);
197
    av_freep(&vc->saved);
198

    
199
    for (i = 0; i < vc->residue_count; i++)
200
        av_free(vc->residues[i].classifs);
201
    av_freep(&vc->residues);
202
    av_freep(&vc->modes);
203

    
204
    ff_mdct_end(&vc->mdct[0]);
205
    ff_mdct_end(&vc->mdct[1]);
206

    
207
    for (i = 0; i < vc->codebook_count; ++i) {
208
        av_free(vc->codebooks[i].codevectors);
209
        free_vlc(&vc->codebooks[i].vlc);
210
    }
211
    av_freep(&vc->codebooks);
212

    
213
    for (i = 0; i < vc->floor_count; ++i) {
214
        if (vc->floors[i].floor_type == 0) {
215
            av_free(vc->floors[i].data.t0.map[0]);
216
            av_free(vc->floors[i].data.t0.map[1]);
217
            av_free(vc->floors[i].data.t0.book_list);
218
            av_free(vc->floors[i].data.t0.lsp);
219
        } else {
220
            av_free(vc->floors[i].data.t1.list);
221
        }
222
    }
223
    av_freep(&vc->floors);
224

    
225
    for (i = 0; i < vc->mapping_count; ++i) {
226
        av_free(vc->mappings[i].magnitude);
227
        av_free(vc->mappings[i].angle);
228
        av_free(vc->mappings[i].mux);
229
    }
230
    av_freep(&vc->mappings);
231
}
232

    
233
// Parse setup header -------------------------------------------------
234

    
235
// Process codebooks part
236

    
237
static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc)
238
{
239
    uint_fast16_t cb;
240
    uint8_t  *tmp_vlc_bits;
241
    uint32_t *tmp_vlc_codes;
242
    GetBitContext *gb = &vc->gb;
243
    uint_fast16_t *codebook_multiplicands;
244

    
245
    vc->codebook_count = get_bits(gb, 8) + 1;
246

    
247
    AV_DEBUG(" Codebooks: %d \n", vc->codebook_count);
248

    
249
    vc->codebooks = av_mallocz(vc->codebook_count * sizeof(vorbis_codebook));
250
    tmp_vlc_bits  = av_mallocz(V_MAX_VLCS * sizeof(uint8_t));
251
    tmp_vlc_codes = av_mallocz(V_MAX_VLCS * sizeof(uint32_t));
252
    codebook_multiplicands = av_malloc(V_MAX_VLCS * sizeof(*codebook_multiplicands));
253

    
254
    for (cb = 0; cb < vc->codebook_count; ++cb) {
255
        vorbis_codebook *codebook_setup = &vc->codebooks[cb];
256
        uint_fast8_t ordered;
257
        uint_fast32_t t, used_entries = 0;
258
        uint_fast32_t entries;
259

    
260
        AV_DEBUG(" %d. Codebook \n", cb);
261

    
262
        if (get_bits(gb, 24) != 0x564342) {
263
            av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". 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, " %"PRIdFAST16". Codebook's dimension is invalid (%d). \n", cb, codebook_setup->dimensions);
270
            goto error;
271
        }
272
        entries = get_bits(gb, 24);
273
        if (entries > V_MAX_VLCS) {
274
            av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook has too many entries (%"PRIdFAST32"). \n", cb, entries);
275
            goto error;
276
        }
277

    
278
        ordered = get_bits1(gb);
279

    
280
        AV_DEBUG(" codebook_dimensions %d, codebook_entries %d \n", codebook_setup->dimensions, entries);
281

    
282
        if (!ordered) {
283
            uint_fast16_t ce;
284
            uint_fast8_t  flag;
285
            uint_fast8_t  sparse = get_bits1(gb);
286

    
287
            AV_DEBUG(" not ordered \n");
288

    
289
            if (sparse) {
290
                AV_DEBUG(" sparse \n");
291

    
292
                used_entries = 0;
293
                for (ce = 0; ce < entries; ++ce) {
294
                    flag = get_bits1(gb);
295
                    if (flag) {
296
                        tmp_vlc_bits[ce] = get_bits(gb, 5) + 1;
297
                        ++used_entries;
298
                    } else
299
                        tmp_vlc_bits[ce] = 0;
300
                }
301
            } else {
302
                AV_DEBUG(" not sparse \n");
303

    
304
                used_entries = entries;
305
                for (ce = 0; ce < entries; ++ce)
306
                    tmp_vlc_bits[ce] = get_bits(gb, 5) + 1;
307
            }
308
        } else {
309
            uint_fast16_t current_entry = 0;
310
            uint_fast8_t current_length = get_bits(gb, 5)+1;
311

    
312
            AV_DEBUG(" ordered, current length: %d \n", current_length);  //FIXME
313

    
314
            used_entries = entries;
315
            for (; current_entry < used_entries && current_length <= 32; ++current_length) {
316
                uint_fast16_t i, number;
317

    
318
                AV_DEBUG(" number bits: %d ", ilog(entries - current_entry));
319

    
320
                number = get_bits(gb, ilog(entries - current_entry));
321

    
322
                AV_DEBUG(" number: %d \n", number);
323

    
324
                for (i = current_entry; i < number+current_entry; ++i)
325
                    if (i < used_entries)
326
                        tmp_vlc_bits[i] = current_length;
327

    
328
                current_entry+=number;
329
            }
330
            if (current_entry>used_entries) {
331
                av_log(vc->avccontext, AV_LOG_ERROR, " More codelengths than codes in codebook. \n");
332
                goto error;
333
            }
334
        }
335

    
336
        codebook_setup->lookup_type = get_bits(gb, 4);
337

    
338
        AV_DEBUG(" lookup type: %d : %s \n", codebook_setup->lookup_type, codebook_setup->lookup_type ? "vq" : "no lookup");
339

    
340
// If the codebook is used for (inverse) VQ, calculate codevectors.
341

    
342
        if (codebook_setup->lookup_type == 1) {
343
            uint_fast16_t i, j, k;
344
            uint_fast16_t codebook_lookup_values = ff_vorbis_nth_root(entries, codebook_setup->dimensions);
345

    
346
            float codebook_minimum_value = vorbisfloat2float(get_bits_long(gb, 32));
347
            float codebook_delta_value   = vorbisfloat2float(get_bits_long(gb, 32));
348
            uint_fast8_t codebook_value_bits = get_bits(gb, 4)+1;
349
            uint_fast8_t codebook_sequence_p = get_bits1(gb);
350

    
351
            AV_DEBUG(" We expect %d numbers for building the codevectors. \n", codebook_lookup_values);
352
            AV_DEBUG("  delta %f minmum %f \n", codebook_delta_value, codebook_minimum_value);
353

    
354
            for (i = 0; i < codebook_lookup_values; ++i) {
355
                codebook_multiplicands[i] = get_bits(gb, codebook_value_bits);
356

    
357
                AV_DEBUG(" multiplicands*delta+minmum : %e \n", (float)codebook_multiplicands[i]*codebook_delta_value+codebook_minimum_value);
358
                AV_DEBUG(" multiplicand %d \n", codebook_multiplicands[i]);
359
            }
360

    
361
// Weed out unused vlcs and build codevector vector
362
            codebook_setup->codevectors = used_entries ? av_mallocz(used_entries*codebook_setup->dimensions * sizeof(float)) : NULL;
363
            for (j = 0, i = 0; i < entries; ++i) {
364
                uint_fast8_t dim = codebook_setup->dimensions;
365

    
366
                if (tmp_vlc_bits[i]) {
367
                    float last = 0.0;
368
                    uint_fast32_t lookup_offset = i;
369

    
370
#ifdef V_DEBUG
371
                    av_log(vc->avccontext, AV_LOG_INFO, "Lookup offset %d ,", i);
372
#endif
373

    
374
                    for (k = 0; k < dim; ++k) {
375
                        uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values;
376
                        codebook_setup->codevectors[j * dim + k] = codebook_multiplicands[multiplicand_offset] * codebook_delta_value + codebook_minimum_value + last;
377
                        if (codebook_sequence_p)
378
                            last = codebook_setup->codevectors[j * dim + k];
379
                        lookup_offset/=codebook_lookup_values;
380
                    }
381
                    tmp_vlc_bits[j] = tmp_vlc_bits[i];
382

    
383
#ifdef V_DEBUG
384
                    av_log(vc->avccontext, AV_LOG_INFO, "real lookup offset %d, vector: ", j);
385
                    for (k = 0; k < dim; ++k)
386
                        av_log(vc->avccontext, AV_LOG_INFO, " %f ", codebook_setup->codevectors[j * dim + k]);
387
                    av_log(vc->avccontext, AV_LOG_INFO, "\n");
388
#endif
389

    
390
                    ++j;
391
                }
392
            }
393
            if (j != used_entries) {
394
                av_log(vc->avccontext, AV_LOG_ERROR, "Bug in codevector vector building code. \n");
395
                goto error;
396
            }
397
            entries = used_entries;
398
        } else if (codebook_setup->lookup_type >= 2) {
399
            av_log(vc->avccontext, AV_LOG_ERROR, "Codebook lookup type not supported. \n");
400
            goto error;
401
        }
402

    
403
// Initialize VLC table
404
        if (ff_vorbis_len2vlc(tmp_vlc_bits, tmp_vlc_codes, entries)) {
405
            av_log(vc->avccontext, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");
406
            goto error;
407
        }
408
        codebook_setup->maxdepth = 0;
409
        for (t = 0; t < entries; ++t)
410
            if (tmp_vlc_bits[t] >= codebook_setup->maxdepth)
411
                codebook_setup->maxdepth = tmp_vlc_bits[t];
412

    
413
        if (codebook_setup->maxdepth > 3 * V_NB_BITS)
414
            codebook_setup->nb_bits = V_NB_BITS2;
415
        else
416
            codebook_setup->nb_bits = V_NB_BITS;
417

    
418
        codebook_setup->maxdepth = (codebook_setup->maxdepth+codebook_setup->nb_bits - 1) / codebook_setup->nb_bits;
419

    
420
        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)) {
421
            av_log(vc->avccontext, AV_LOG_ERROR, " Error generating vlc tables. \n");
422
            goto error;
423
        }
424
    }
425

    
426
    av_free(tmp_vlc_bits);
427
    av_free(tmp_vlc_codes);
428
    av_free(codebook_multiplicands);
429
    return 0;
430

    
431
// Error:
432
error:
433
    av_free(tmp_vlc_bits);
434
    av_free(tmp_vlc_codes);
435
    av_free(codebook_multiplicands);
436
    return -1;
437
}
438

    
439
// Process time domain transforms part (unused in Vorbis I)
440

    
441
static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc)
442
{
443
    GetBitContext *gb = &vc->gb;
444
    uint_fast8_t i;
445
    uint_fast8_t vorbis_time_count = get_bits(gb, 6) + 1;
446

    
447
    for (i = 0; i < vorbis_time_count; ++i) {
448
        uint_fast16_t vorbis_tdtransform = get_bits(gb, 16);
449

    
450
        AV_DEBUG(" Vorbis time domain transform %d: %d \n", vorbis_time_count, vorbis_tdtransform);
451

    
452
        if (vorbis_tdtransform) {
453
            av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n");
454
            return -1;
455
        }
456
    }
457
    return 0;
458
}
459

    
460
// Process floors part
461

    
462
static int vorbis_floor0_decode(vorbis_context *vc,
463
                                vorbis_floor_data *vfu, float *vec);
464
static void create_map(vorbis_context *vc, uint_fast8_t floor_number);
465
static int vorbis_floor1_decode(vorbis_context *vc,
466
                                vorbis_floor_data *vfu, float *vec);
467
static int vorbis_parse_setup_hdr_floors(vorbis_context *vc)
468
{
469
    GetBitContext *gb = &vc->gb;
470
    int i,j,k;
471

    
472
    vc->floor_count = get_bits(gb, 6) + 1;
473

    
474
    vc->floors = av_mallocz(vc->floor_count * sizeof(vorbis_floor));
475

    
476
    for (i = 0; i < vc->floor_count; ++i) {
477
        vorbis_floor *floor_setup = &vc->floors[i];
478

    
479
        floor_setup->floor_type = get_bits(gb, 16);
480

    
481
        AV_DEBUG(" %d. floor type %d \n", i, floor_setup->floor_type);
482

    
483
        if (floor_setup->floor_type == 1) {
484
            int maximum_class = -1;
485
            uint_fast8_t  rangebits;
486
            uint_fast32_t rangemax;
487
            uint_fast16_t floor1_values = 2;
488

    
489
            floor_setup->decode = vorbis_floor1_decode;
490

    
491
            floor_setup->data.t1.partitions = get_bits(gb, 5);
492

    
493
            AV_DEBUG(" %d.floor: %d partitions \n", i, floor_setup->data.t1.partitions);
494

    
495
            for (j = 0; j < floor_setup->data.t1.partitions; ++j) {
496
                floor_setup->data.t1.partition_class[j] = get_bits(gb, 4);
497
                if (floor_setup->data.t1.partition_class[j] > maximum_class)
498
                    maximum_class = floor_setup->data.t1.partition_class[j];
499

    
500
                AV_DEBUG(" %d. floor %d partition class %d \n", i, j, floor_setup->data.t1.partition_class[j]);
501

    
502
            }
503

    
504
            AV_DEBUG(" maximum class %d \n", maximum_class);
505

    
506
            for (j = 0; j <= maximum_class; ++j) {
507
                floor_setup->data.t1.class_dimensions[j] = get_bits(gb, 3) + 1;
508
                floor_setup->data.t1.class_subclasses[j] = get_bits(gb, 2);
509

    
510
                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]);
511

    
512
                if (floor_setup->data.t1.class_subclasses[j]) {
513
                    GET_VALIDATED_INDEX(floor_setup->data.t1.class_masterbook[j], 8, vc->codebook_count)
514

    
515
                    AV_DEBUG("   masterbook: %d \n", floor_setup->data.t1.class_masterbook[j]);
516
                }
517

    
518
                for (k = 0; k < (1 << floor_setup->data.t1.class_subclasses[j]); ++k) {
519
                    int16_t bits = get_bits(gb, 8) - 1;
520
                    if (bits != -1)
521
                        VALIDATE_INDEX(bits, vc->codebook_count)
522
                    floor_setup->data.t1.subclass_books[j][k] = bits;
523

    
524
                    AV_DEBUG("    book %d. : %d \n", k, floor_setup->data.t1.subclass_books[j][k]);
525
                }
526
            }
527

    
528
            floor_setup->data.t1.multiplier = get_bits(gb, 2) + 1;
529
            floor_setup->data.t1.x_list_dim = 2;
530

    
531
            for (j = 0; j < floor_setup->data.t1.partitions; ++j)
532
                floor_setup->data.t1.x_list_dim+=floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];
533

    
534
            floor_setup->data.t1.list = av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(vorbis_floor1_entry));
535

    
536

    
537
            rangebits = get_bits(gb, 4);
538
            rangemax = (1 << rangebits);
539
            if (rangemax > vc->blocksize[1] / 2) {
540
                av_log(vc->avccontext, AV_LOG_ERROR,
541
                       "Floor value is too large for blocksize: %d (%d)\n",
542
                       rangemax, vc->blocksize[1] / 2);
543
                return -1;
544
            }
545
            floor_setup->data.t1.list[0].x = 0;
546
            floor_setup->data.t1.list[1].x = rangemax;
547

    
548
            for (j = 0; j < floor_setup->data.t1.partitions; ++j) {
549
                for (k = 0; k < floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]]; ++k, ++floor1_values) {
550
                    floor_setup->data.t1.list[floor1_values].x = get_bits(gb, rangebits);
551

    
552
                    AV_DEBUG(" %d. floor1 Y coord. %d \n", floor1_values, floor_setup->data.t1.list[floor1_values].x);
553
                }
554
            }
555

    
556
// Precalculate order of x coordinates - needed for decode
557
            ff_vorbis_ready_floor1_list(floor_setup->data.t1.list, floor_setup->data.t1.x_list_dim);
558
        } else if (floor_setup->floor_type == 0) {
559
            uint_fast8_t max_codebook_dim = 0;
560

    
561
            floor_setup->decode = vorbis_floor0_decode;
562

    
563
            floor_setup->data.t0.order          = get_bits(gb,  8);
564
            floor_setup->data.t0.rate           = get_bits(gb, 16);
565
            floor_setup->data.t0.bark_map_size  = get_bits(gb, 16);
566
            floor_setup->data.t0.amplitude_bits = get_bits(gb,  6);
567
            /* zero would result in a div by zero later *
568
             * 2^0 - 1 == 0                             */
569
            if (floor_setup->data.t0.amplitude_bits == 0) {
570
              av_log(vc->avccontext, AV_LOG_ERROR,
571
                     "Floor 0 amplitude bits is 0.\n");
572
              return -1;
573
            }
574
            floor_setup->data.t0.amplitude_offset = get_bits(gb, 8);
575
            floor_setup->data.t0.num_books        = get_bits(gb, 4) + 1;
576

    
577
            /* allocate mem for booklist */
578
            floor_setup->data.t0.book_list =
579
                av_malloc(floor_setup->data.t0.num_books);
580
            if (!floor_setup->data.t0.book_list)
581
                return -1;
582
            /* read book indexes */
583
            {
584
                int idx;
585
                uint_fast8_t book_idx;
586
                for (idx = 0; idx < floor_setup->data.t0.num_books; ++idx) {
587
                    GET_VALIDATED_INDEX(book_idx, 8, vc->codebook_count)
588
                    floor_setup->data.t0.book_list[idx] = book_idx;
589
                    if (vc->codebooks[book_idx].dimensions > max_codebook_dim)
590
                        max_codebook_dim = vc->codebooks[book_idx].dimensions;
591
                }
592
            }
593

    
594
            create_map(vc, i);
595

    
596
            /* allocate mem for lsp coefficients */
597
            {
598
                /* codebook dim is for padding if codebook dim doesn't *
599
                 * divide order+1 then we need to read more data       */
600
                floor_setup->data.t0.lsp =
601
                    av_malloc((floor_setup->data.t0.order+1 + max_codebook_dim)
602
                              * sizeof(float));
603
                if (!floor_setup->data.t0.lsp)
604
                    return -1;
605
            }
606

    
607
#ifdef V_DEBUG /* debug output parsed headers */
608
            AV_DEBUG("floor0 order: %u\n", floor_setup->data.t0.order);
609
            AV_DEBUG("floor0 rate: %u\n", floor_setup->data.t0.rate);
610
            AV_DEBUG("floor0 bark map size: %u\n",
611
              floor_setup->data.t0.bark_map_size);
612
            AV_DEBUG("floor0 amplitude bits: %u\n",
613
              floor_setup->data.t0.amplitude_bits);
614
            AV_DEBUG("floor0 amplitude offset: %u\n",
615
              floor_setup->data.t0.amplitude_offset);
616
            AV_DEBUG("floor0 number of books: %u\n",
617
              floor_setup->data.t0.num_books);
618
            AV_DEBUG("floor0 book list pointer: %p\n",
619
              floor_setup->data.t0.book_list);
620
            {
621
              int idx;
622
              for (idx = 0; idx < floor_setup->data.t0.num_books; ++idx) {
623
                  AV_DEBUG("  Book %d: %u\n",
624
                           idx+1,
625
                           floor_setup->data.t0.book_list[idx]);
626
              }
627
            }
628
#endif
629
        } else {
630
            av_log(vc->avccontext, AV_LOG_ERROR, "Invalid floor type!\n");
631
            return -1;
632
        }
633
    }
634
    return 0;
635
}
636

    
637
// Process residues part
638

    
639
static int vorbis_parse_setup_hdr_residues(vorbis_context *vc)
640
{
641
    GetBitContext *gb = &vc->gb;
642
    uint_fast8_t i, j, k;
643

    
644
    vc->residue_count = get_bits(gb, 6)+1;
645
    vc->residues      = av_mallocz(vc->residue_count * sizeof(vorbis_residue));
646

    
647
    AV_DEBUG(" There are %d residues. \n", vc->residue_count);
648

    
649
    for (i = 0; i < vc->residue_count; ++i) {
650
        vorbis_residue *res_setup = &vc->residues[i];
651
        uint_fast8_t cascade[64];
652
        uint_fast8_t high_bits;
653
        uint_fast8_t low_bits;
654

    
655
        res_setup->type = get_bits(gb, 16);
656

    
657
        AV_DEBUG(" %d. residue type %d \n", i, res_setup->type);
658

    
659
        res_setup->begin          = get_bits(gb, 24);
660
        res_setup->end            = get_bits(gb, 24);
661
        res_setup->partition_size = get_bits(gb, 24) + 1;
662
        /* Validations to prevent a buffer overflow later. */
663
        if (res_setup->begin>res_setup->end ||
664
            res_setup->end > vc->avccontext->channels * vc->blocksize[1] / 2 ||
665
            (res_setup->end-res_setup->begin) / res_setup->partition_size > V_MAX_PARTITIONS) {
666
            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);
667
            return -1;
668
        }
669

    
670
        res_setup->classifications = get_bits(gb, 6) + 1;
671
        GET_VALIDATED_INDEX(res_setup->classbook, 8, vc->codebook_count)
672

    
673
        res_setup->ptns_to_read =
674
            (res_setup->end - res_setup->begin) / res_setup->partition_size;
675
        res_setup->classifs = av_malloc(res_setup->ptns_to_read *
676
                                        vc->audio_channels *
677
                                        sizeof(*res_setup->classifs));
678
        if (!res_setup->classifs)
679
            return AVERROR(ENOMEM);
680

    
681
        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,
682
          res_setup->classifications, res_setup->classbook);
683

    
684
        for (j = 0; j < res_setup->classifications; ++j) {
685
            high_bits = 0;
686
            low_bits  = get_bits(gb, 3);
687
            if (get_bits1(gb))
688
                high_bits = get_bits(gb, 5);
689
            cascade[j] = (high_bits << 3) + low_bits;
690

    
691
            AV_DEBUG("     %d class casscade depth: %d \n", j, ilog(cascade[j]));
692
        }
693

    
694
        res_setup->maxpass = 0;
695
        for (j = 0; j < res_setup->classifications; ++j) {
696
            for (k = 0; k < 8; ++k) {
697
                if (cascade[j]&(1 << k)) {
698
                    GET_VALIDATED_INDEX(res_setup->books[j][k], 8, vc->codebook_count)
699

    
700
                    AV_DEBUG("     %d class casscade depth %d book: %d \n", j, k, res_setup->books[j][k]);
701

    
702
                    if (k>res_setup->maxpass)
703
                        res_setup->maxpass = k;
704
                } else {
705
                    res_setup->books[j][k] = -1;
706
                }
707
            }
708
        }
709
    }
710
    return 0;
711
}
712

    
713
// Process mappings part
714

    
715
static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc)
716
{
717
    GetBitContext *gb = &vc->gb;
718
    uint_fast8_t i, j;
719

    
720
    vc->mapping_count = get_bits(gb, 6)+1;
721
    vc->mappings      = av_mallocz(vc->mapping_count * sizeof(vorbis_mapping));
722

    
723
    AV_DEBUG(" There are %d mappings. \n", vc->mapping_count);
724

    
725
    for (i = 0; i < vc->mapping_count; ++i) {
726
        vorbis_mapping *mapping_setup = &vc->mappings[i];
727

    
728
        if (get_bits(gb, 16)) {
729
            av_log(vc->avccontext, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n");
730
            return -1;
731
        }
732
        if (get_bits1(gb)) {
733
            mapping_setup->submaps = get_bits(gb, 4) + 1;
734
        } else {
735
            mapping_setup->submaps = 1;
736
        }
737

    
738
        if (get_bits1(gb)) {
739
            mapping_setup->coupling_steps = get_bits(gb, 8) + 1;
740
            mapping_setup->magnitude      = av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
741
            mapping_setup->angle          = av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
742
            for (j = 0; j < mapping_setup->coupling_steps; ++j) {
743
                GET_VALIDATED_INDEX(mapping_setup->magnitude[j], ilog(vc->audio_channels - 1), vc->audio_channels)
744
                GET_VALIDATED_INDEX(mapping_setup->angle[j],     ilog(vc->audio_channels - 1), vc->audio_channels)
745
            }
746
        } else {
747
            mapping_setup->coupling_steps = 0;
748
        }
749

    
750
        AV_DEBUG("   %d mapping coupling steps: %d \n", i, mapping_setup->coupling_steps);
751

    
752
        if (get_bits(gb, 2)) {
753
            av_log(vc->avccontext, AV_LOG_ERROR, "%d. mapping setup data invalid. \n", i);
754
            return -1; // following spec.
755
        }
756

    
757
        if (mapping_setup->submaps>1) {
758
            mapping_setup->mux = av_mallocz(vc->audio_channels * sizeof(uint_fast8_t));
759
            for (j = 0; j < vc->audio_channels; ++j)
760
                mapping_setup->mux[j] = get_bits(gb, 4);
761
        }
762

    
763
        for (j = 0; j < mapping_setup->submaps; ++j) {
764
            skip_bits(gb, 8); // FIXME check?
765
            GET_VALIDATED_INDEX(mapping_setup->submap_floor[j],   8, vc->floor_count)
766
            GET_VALIDATED_INDEX(mapping_setup->submap_residue[j], 8, vc->residue_count)
767

    
768
            AV_DEBUG("   %d mapping %d submap : floor %d, residue %d \n", i, j, mapping_setup->submap_floor[j], mapping_setup->submap_residue[j]);
769
        }
770
    }
771
    return 0;
772
}
773

    
774
// Process modes part
775

    
776
static void create_map(vorbis_context *vc, uint_fast8_t floor_number)
777
{
778
    vorbis_floor *floors = vc->floors;
779
    vorbis_floor0 *vf;
780
    int idx;
781
    int_fast8_t blockflag;
782
    int_fast32_t *map;
783
    int_fast32_t n; //TODO: could theoretically be smaller?
784

    
785
    for (blockflag = 0; blockflag < 2; ++blockflag) {
786
        n = vc->blocksize[blockflag] / 2;
787
        floors[floor_number].data.t0.map[blockflag] =
788
            av_malloc((n+1) * sizeof(int_fast32_t)); // n + sentinel
789

    
790
        map =  floors[floor_number].data.t0.map[blockflag];
791
        vf  = &floors[floor_number].data.t0;
792

    
793
        for (idx = 0; idx < n; ++idx) {
794
            map[idx] = floor(BARK((vf->rate * idx) / (2.0f * n)) *
795
                             ((vf->bark_map_size) /
796
                              BARK(vf->rate / 2.0f)));
797
            if (vf->bark_map_size-1 < map[idx])
798
                map[idx] = vf->bark_map_size - 1;
799
        }
800
        map[n] = -1;
801
        vf->map_size[blockflag] = n;
802
    }
803

    
804
#   ifdef V_DEBUG
805
    for (idx = 0; idx <= n; ++idx) {
806
        AV_DEBUG("floor0 map: map at pos %d is %d\n",
807
                 idx, map[idx]);
808
    }
809
#   endif
810
}
811

    
812
static int vorbis_parse_setup_hdr_modes(vorbis_context *vc)
813
{
814
    GetBitContext *gb = &vc->gb;
815
    uint_fast8_t i;
816

    
817
    vc->mode_count = get_bits(gb, 6) + 1;
818
    vc->modes      = av_mallocz(vc->mode_count * sizeof(vorbis_mode));
819

    
820
    AV_DEBUG(" There are %d modes.\n", vc->mode_count);
821

    
822
    for (i = 0; i < vc->mode_count; ++i) {
823
        vorbis_mode *mode_setup = &vc->modes[i];
824

    
825
        mode_setup->blockflag     = get_bits1(gb);
826
        mode_setup->windowtype    = get_bits(gb, 16); //FIXME check
827
        mode_setup->transformtype = get_bits(gb, 16); //FIXME check
828
        GET_VALIDATED_INDEX(mode_setup->mapping, 8, vc->mapping_count);
829

    
830
        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);
831
    }
832
    return 0;
833
}
834

    
835
// Process the whole setup header using the functions above
836

    
837
static int vorbis_parse_setup_hdr(vorbis_context *vc)
838
{
839
    GetBitContext *gb = &vc->gb;
840

    
841
    if ((get_bits(gb, 8) != 'v') || (get_bits(gb, 8) != 'o') ||
842
        (get_bits(gb, 8) != 'r') || (get_bits(gb, 8) != 'b') ||
843
        (get_bits(gb, 8) != 'i') || (get_bits(gb, 8) != 's')) {
844
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n");
845
        return -1;
846
    }
847

    
848
    if (vorbis_parse_setup_hdr_codebooks(vc)) {
849
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n");
850
        return -2;
851
    }
852
    if (vorbis_parse_setup_hdr_tdtransforms(vc)) {
853
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n");
854
        return -3;
855
    }
856
    if (vorbis_parse_setup_hdr_floors(vc)) {
857
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n");
858
        return -4;
859
    }
860
    if (vorbis_parse_setup_hdr_residues(vc)) {
861
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n");
862
        return -5;
863
    }
864
    if (vorbis_parse_setup_hdr_mappings(vc)) {
865
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n");
866
        return -6;
867
    }
868
    if (vorbis_parse_setup_hdr_modes(vc)) {
869
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n");
870
        return -7;
871
    }
872
    if (!get_bits1(gb)) {
873
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n");
874
        return -8; // framing flag bit unset error
875
    }
876

    
877
    return 0;
878
}
879

    
880
// Process the identification header
881

    
882
static int vorbis_parse_id_hdr(vorbis_context *vc)
883
{
884
    GetBitContext *gb = &vc->gb;
885
    uint_fast8_t bl0, bl1;
886

    
887
    if ((get_bits(gb, 8) != 'v') || (get_bits(gb, 8) != 'o') ||
888
        (get_bits(gb, 8) != 'r') || (get_bits(gb, 8) != 'b') ||
889
        (get_bits(gb, 8) != 'i') || (get_bits(gb, 8) != 's')) {
890
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n");
891
        return -1;
892
    }
893

    
894
    vc->version        = get_bits_long(gb, 32);    //FIXME check 0
895
    vc->audio_channels = get_bits(gb, 8);
896
    if (vc->audio_channels <= 0) {
897
        av_log(vc->avccontext, AV_LOG_ERROR, "Invalid number of channels\n");
898
        return -1;
899
    }
900
    vc->audio_samplerate = get_bits_long(gb, 32);
901
    if (vc->audio_samplerate <= 0) {
902
        av_log(vc->avccontext, AV_LOG_ERROR, "Invalid samplerate\n");
903
        return -1;
904
    }
905
    vc->bitrate_maximum = get_bits_long(gb, 32);
906
    vc->bitrate_nominal = get_bits_long(gb, 32);
907
    vc->bitrate_minimum = get_bits_long(gb, 32);
908
    bl0 = get_bits(gb, 4);
909
    bl1 = get_bits(gb, 4);
910
    vc->blocksize[0] = (1 << bl0);
911
    vc->blocksize[1] = (1 << bl1);
912
    if (bl0 > 13 || bl0 < 6 || bl1 > 13 || bl1 < 6 || bl1 < bl0) {
913
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n");
914
        return -3;
915
    }
916
    // output format int16
917
    if (vc->blocksize[1] / 2 * vc->audio_channels * 2 > AVCODEC_MAX_AUDIO_FRAME_SIZE) {
918
        av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis channel count makes "
919
               "output packets too large.\n");
920
        return -4;
921
    }
922
    vc->win[0] = ff_vorbis_vwin[bl0 - 6];
923
    vc->win[1] = ff_vorbis_vwin[bl1 - 6];
924

    
925
    if ((get_bits1(gb)) == 0) {
926
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n");
927
        return -2;
928
    }
929

    
930
    vc->channel_residues =  av_malloc((vc->blocksize[1]  / 2) * vc->audio_channels * sizeof(float));
931
    vc->channel_floors   =  av_malloc((vc->blocksize[1]  / 2) * vc->audio_channels * sizeof(float));
932
    vc->saved            =  av_mallocz((vc->blocksize[1] / 4) * vc->audio_channels * sizeof(float));
933
    vc->previous_window  = 0;
934

    
935
    ff_mdct_init(&vc->mdct[0], bl0, 1, vc->exp_bias ? -(1 << 15) : -1.0);
936
    ff_mdct_init(&vc->mdct[1], bl1, 1, vc->exp_bias ? -(1 << 15) : -1.0);
937

    
938
    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 ",
939
            vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize[0], vc->blocksize[1]);
940

    
941
/*
942
    BLK = vc->blocksize[0];
943
    for (i = 0; i < BLK / 2; ++i) {
944
        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)));
945
    }
946
*/
947

    
948
    return 0;
949
}
950

    
951
// Process the extradata using the functions above (identification header, setup header)
952

    
953
static av_cold int vorbis_decode_init(AVCodecContext *avccontext)
954
{
955
    vorbis_context *vc = avccontext->priv_data ;
956
    uint8_t *headers   = avccontext->extradata;
957
    int headers_len    = avccontext->extradata_size;
958
    uint8_t *header_start[3];
959
    int header_len[3];
960
    GetBitContext *gb = &(vc->gb);
961
    int hdr_type;
962

    
963
    vc->avccontext = avccontext;
964
    dsputil_init(&vc->dsp, avccontext);
965

    
966
    if (vc->dsp.float_to_int16_interleave == ff_float_to_int16_interleave_c) {
967
        vc->add_bias = 385;
968
        vc->exp_bias = 0;
969
    } else {
970
        vc->add_bias = 0;
971
        vc->exp_bias = 15 << 23;
972
    }
973

    
974
    if (!headers_len) {
975
        av_log(avccontext, AV_LOG_ERROR, "Extradata missing.\n");
976
        return -1;
977
    }
978

    
979
    if (ff_split_xiph_headers(headers, headers_len, 30, header_start, header_len) < 0) {
980
        av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
981
        return -1;
982
    }
983

    
984
    init_get_bits(gb, header_start[0], header_len[0]*8);
985
    hdr_type = get_bits(gb, 8);
986
    if (hdr_type != 1) {
987
        av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n");
988
        return -1;
989
    }
990
    if (vorbis_parse_id_hdr(vc)) {
991
        av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n");
992
        vorbis_free(vc);
993
        return -1;
994
    }
995

    
996
    init_get_bits(gb, header_start[2], header_len[2]*8);
997
    hdr_type = get_bits(gb, 8);
998
    if (hdr_type != 5) {
999
        av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");
1000
        vorbis_free(vc);
1001
        return -1;
1002
    }
1003
    if (vorbis_parse_setup_hdr(vc)) {
1004
        av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");
1005
        vorbis_free(vc);
1006
        return -1;
1007
    }
1008

    
1009
    if (vc->audio_channels > 8)
1010
        avccontext->channel_layout = 0;
1011
    else
1012
        avccontext->channel_layout = ff_vorbis_channel_layouts[vc->audio_channels - 1];
1013

    
1014
    avccontext->channels    = vc->audio_channels;
1015
    avccontext->sample_rate = vc->audio_samplerate;
1016
    avccontext->frame_size  = FFMIN(vc->blocksize[0], vc->blocksize[1]) >> 2;
1017
    avccontext->sample_fmt  = AV_SAMPLE_FMT_S16;
1018

    
1019
    return 0 ;
1020
}
1021

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

    
1024
// Read and decode floor
1025

    
1026
static int vorbis_floor0_decode(vorbis_context *vc,
1027
                                vorbis_floor_data *vfu, float *vec)
1028
{
1029
    vorbis_floor0 *vf = &vfu->t0;
1030
    float *lsp = vf->lsp;
1031
    uint_fast32_t amplitude;
1032
    uint_fast32_t book_idx;
1033
    uint_fast8_t blockflag = vc->modes[vc->mode_number].blockflag;
1034

    
1035
    amplitude = get_bits(&vc->gb, vf->amplitude_bits);
1036
    if (amplitude > 0) {
1037
        float last = 0;
1038
        uint_fast16_t lsp_len = 0;
1039
        uint_fast16_t idx;
1040
        vorbis_codebook codebook;
1041

    
1042
        book_idx = get_bits(&vc->gb, ilog(vf->num_books));
1043
        if (book_idx >= vf->num_books) {
1044
            av_log(vc->avccontext, AV_LOG_ERROR,
1045
                    "floor0 dec: booknumber too high!\n");
1046
            book_idx =  0;
1047
            //FIXME: look above
1048
        }
1049
        AV_DEBUG("floor0 dec: booknumber: %u\n", book_idx);
1050
        codebook = vc->codebooks[vf->book_list[book_idx]];
1051
        /* Invalid codebook! */
1052
        if (!codebook.codevectors)
1053
            return -1;
1054

    
1055
        while (lsp_len<vf->order) {
1056
            int vec_off;
1057

    
1058
            AV_DEBUG("floor0 dec: book dimension: %d\n", codebook.dimensions);
1059
            AV_DEBUG("floor0 dec: maximum depth: %d\n", codebook.maxdepth);
1060
            /* read temp vector */
1061
            vec_off = get_vlc2(&vc->gb, codebook.vlc.table,
1062
                               codebook.nb_bits, codebook.maxdepth)
1063
                      * codebook.dimensions;
1064
            AV_DEBUG("floor0 dec: vector offset: %d\n", vec_off);
1065
            /* copy each vector component and add last to it */
1066
            for (idx = 0; idx < codebook.dimensions; ++idx)
1067
                lsp[lsp_len+idx] = codebook.codevectors[vec_off+idx] + last;
1068
            last = lsp[lsp_len+idx-1]; /* set last to last vector component */
1069

    
1070
            lsp_len += codebook.dimensions;
1071
        }
1072
#ifdef V_DEBUG
1073
        /* DEBUG: output lsp coeffs */
1074
        {
1075
            int idx;
1076
            for (idx = 0; idx < lsp_len; ++idx)
1077
                AV_DEBUG("floor0 dec: coeff at %d is %f\n", idx, lsp[idx]);
1078
        }
1079
#endif
1080

    
1081
        /* synthesize floor output vector */
1082
        {
1083
            int i;
1084
            int order = vf->order;
1085
            float wstep = M_PI / vf->bark_map_size;
1086

    
1087
            for (i = 0; i < order; i++)
1088
                lsp[i] = 2.0f * cos(lsp[i]);
1089

    
1090
            AV_DEBUG("floor0 synth: map_size = %d; m = %d; wstep = %f\n",
1091
                     vf->map_size, order, wstep);
1092

    
1093
            i = 0;
1094
            while (i < vf->map_size[blockflag]) {
1095
                int j, iter_cond = vf->map[blockflag][i];
1096
                float p = 0.5f;
1097
                float q = 0.5f;
1098
                float two_cos_w = 2.0f * cos(wstep * iter_cond); // needed all times
1099

    
1100
                /* similar part for the q and p products */
1101
                for (j = 0; j + 1 < order; j += 2) {
1102
                    q *= lsp[j]     - two_cos_w;
1103
                    p *= lsp[j + 1] - two_cos_w;
1104
                }
1105
                if (j == order) { // even order
1106
                    p *= p * (2.0f - two_cos_w);
1107
                    q *= q * (2.0f + two_cos_w);
1108
                } else { // odd order
1109
                    q *= two_cos_w-lsp[j]; // one more time for q
1110

    
1111
                    /* final step and square */
1112
                    p *= p * (4.f - two_cos_w * two_cos_w);
1113
                    q *= q;
1114
                }
1115

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

    
1123
                /* fill vector */
1124
                do {
1125
                    vec[i] = q; ++i;
1126
                } while (vf->map[blockflag][i] == iter_cond);
1127
            }
1128
        }
1129
    } else {
1130
        /* this channel is unused */
1131
        return 1;
1132
    }
1133

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

    
1136
    return 0;
1137
}
1138

    
1139
static int vorbis_floor1_decode(vorbis_context *vc,
1140
                                vorbis_floor_data *vfu, float *vec)
1141
{
1142
    vorbis_floor1 *vf = &vfu->t1;
1143
    GetBitContext *gb = &vc->gb;
1144
    uint_fast16_t range_v[4] = { 256, 128, 86, 64 };
1145
    uint_fast16_t range = range_v[vf->multiplier-1];
1146
    uint_fast16_t floor1_Y[258];
1147
    uint_fast16_t floor1_Y_final[258];
1148
    int floor1_flag[258];
1149
    uint_fast8_t class_;
1150
    uint_fast8_t cdim;
1151
    uint_fast8_t cbits;
1152
    uint_fast8_t csub;
1153
    uint_fast8_t cval;
1154
    int_fast16_t book;
1155
    uint_fast16_t offset;
1156
    uint_fast16_t i,j;
1157
    int_fast16_t adx, ady, dy, off, predicted;
1158
    int_fast32_t err;
1159

    
1160

    
1161
    if (!get_bits1(gb)) // silence
1162
        return 1;
1163

    
1164
// Read values (or differences) for the floor's points
1165

    
1166
    floor1_Y[0] = get_bits(gb, ilog(range - 1));
1167
    floor1_Y[1] = get_bits(gb, ilog(range - 1));
1168

    
1169
    AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);
1170

    
1171
    offset = 2;
1172
    for (i = 0; i < vf->partitions; ++i) {
1173
        class_ = vf->partition_class[i];
1174
        cdim   = vf->class_dimensions[class_];
1175
        cbits  = vf->class_subclasses[class_];
1176
        csub = (1 << cbits) - 1;
1177
        cval = 0;
1178

    
1179
        AV_DEBUG("Cbits %d \n", cbits);
1180

    
1181
        if (cbits) // this reads all subclasses for this partition's class
1182
            cval = get_vlc2(gb, vc->codebooks[vf->class_masterbook[class_]].vlc.table,
1183
                            vc->codebooks[vf->class_masterbook[class_]].nb_bits, 3);
1184

    
1185
        for (j = 0; j < cdim; ++j) {
1186
            book = vf->subclass_books[class_][cval & csub];
1187

    
1188
            AV_DEBUG("book %d Cbits %d cval %d  bits:%d \n", book, cbits, cval, get_bits_count(gb));
1189

    
1190
            cval = cval >> cbits;
1191
            if (book > -1) {
1192
                floor1_Y[offset+j] = get_vlc2(gb, vc->codebooks[book].vlc.table,
1193
                vc->codebooks[book].nb_bits, 3);
1194
            } else {
1195
                floor1_Y[offset+j] = 0;
1196
            }
1197

    
1198
            AV_DEBUG(" floor(%d) = %d \n", vf->list[offset+j].x, floor1_Y[offset+j]);
1199
        }
1200
        offset+=cdim;
1201
    }
1202

    
1203
// Amplitude calculation from the differences
1204

    
1205
    floor1_flag[0] = 1;
1206
    floor1_flag[1] = 1;
1207
    floor1_Y_final[0] = floor1_Y[0];
1208
    floor1_Y_final[1] = floor1_Y[1];
1209

    
1210
    for (i = 2; i < vf->x_list_dim; ++i) {
1211
        uint_fast16_t val, highroom, lowroom, room;
1212
        uint_fast16_t high_neigh_offs;
1213
        uint_fast16_t low_neigh_offs;
1214

    
1215
        low_neigh_offs  = vf->list[i].low;
1216
        high_neigh_offs = vf->list[i].high;
1217
        dy  = floor1_Y_final[high_neigh_offs] - floor1_Y_final[low_neigh_offs];  // render_point begin
1218
        adx = vf->list[high_neigh_offs].x - vf->list[low_neigh_offs].x;
1219
        ady = FFABS(dy);
1220
        err = ady * (vf->list[i].x - vf->list[low_neigh_offs].x);
1221
        off = err / adx;
1222
        if (dy < 0) {
1223
            predicted = floor1_Y_final[low_neigh_offs] - off;
1224
        } else {
1225
            predicted = floor1_Y_final[low_neigh_offs] + off;
1226
        } // render_point end
1227

    
1228
        val = floor1_Y[i];
1229
        highroom = range-predicted;
1230
        lowroom  = predicted;
1231
        if (highroom < lowroom) {
1232
            room = highroom * 2;
1233
        } else {
1234
            room = lowroom * 2;   // SPEC mispelling
1235
        }
1236
        if (val) {
1237
            floor1_flag[low_neigh_offs]  = 1;
1238
            floor1_flag[high_neigh_offs] = 1;
1239
            floor1_flag[i]               = 1;
1240
            if (val >= room) {
1241
                if (highroom > lowroom) {
1242
                    floor1_Y_final[i] = val - lowroom + predicted;
1243
                } else {
1244
                    floor1_Y_final[i] = predicted - val + highroom - 1;
1245
                }
1246
            } else {
1247
                if (val & 1) {
1248
                    floor1_Y_final[i] = predicted - (val + 1) / 2;
1249
                } else {
1250
                    floor1_Y_final[i] = predicted + val / 2;
1251
                }
1252
            }
1253
        } else {
1254
            floor1_flag[i]    = 0;
1255
            floor1_Y_final[i] = predicted;
1256
        }
1257

    
1258
        AV_DEBUG(" Decoded floor(%d) = %d / val %d \n", vf->list[i].x, floor1_Y_final[i], val);
1259
    }
1260

    
1261
// Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?
1262

    
1263
    ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);
1264

    
1265
    AV_DEBUG(" Floor decoded\n");
1266

    
1267
    return 0;
1268
}
1269

    
1270
// Read and decode residue
1271

    
1272
static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc,
1273
                                                           vorbis_residue *vr,
1274
                                                           uint_fast8_t ch,
1275
                                                           uint_fast8_t *do_not_decode,
1276
                                                           float *vec,
1277
                                                           uint_fast16_t vlen,
1278
                                                           int vr_type)
1279
{
1280
    GetBitContext *gb = &vc->gb;
1281
    uint_fast8_t c_p_c = vc->codebooks[vr->classbook].dimensions;
1282
    uint_fast16_t ptns_to_read = vr->ptns_to_read;
1283
    uint8_t *classifs = vr->classifs;
1284
    uint_fast8_t pass;
1285
    uint_fast8_t ch_used;
1286
    uint_fast8_t i,j,l;
1287
    uint_fast16_t k;
1288

    
1289
    if (vr_type == 2) {
1290
        for (j = 1; j < ch; ++j)
1291
            do_not_decode[0] &= do_not_decode[j];  // FIXME - clobbering input
1292
        if (do_not_decode[0])
1293
            return 0;
1294
        ch_used = 1;
1295
    } else {
1296
        ch_used = ch;
1297
    }
1298

    
1299
    AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);
1300

    
1301
    for (pass = 0; pass <= vr->maxpass; ++pass) { // FIXME OPTIMIZE?
1302
        uint_fast16_t voffset;
1303
        uint_fast16_t partition_count;
1304
        uint_fast16_t j_times_ptns_to_read;
1305

    
1306
        voffset = vr->begin;
1307
        for (partition_count = 0; partition_count < ptns_to_read;) {  // SPEC        error
1308
            if (!pass) {
1309
                uint_fast32_t inverse_class = ff_inverse[vr->classifications];
1310
                for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {
1311
                    if (!do_not_decode[j]) {
1312
                        uint_fast32_t temp = get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,
1313
                        vc->codebooks[vr->classbook].nb_bits, 3);
1314

    
1315
                        AV_DEBUG("Classword: %d \n", temp);
1316

    
1317
                        assert(vr->classifications > 1 && temp <= 65536); //needed for inverse[]
1318
                        for (i = 0; i < c_p_c; ++i) {
1319
                            uint_fast32_t temp2;
1320

    
1321
                            temp2 = (((uint_fast64_t)temp) * inverse_class) >> 32;
1322
                            if (partition_count + c_p_c - 1 - i < ptns_to_read)
1323
                                classifs[j_times_ptns_to_read + partition_count + c_p_c - 1 - i] = temp - temp2 * vr->classifications;
1324
                            temp = temp2;
1325
                        }
1326
                    }
1327
                    j_times_ptns_to_read += ptns_to_read;
1328
                }
1329
            }
1330
            for (i = 0; (i < c_p_c) && (partition_count < ptns_to_read); ++i) {
1331
                for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {
1332
                    uint_fast16_t voffs;
1333

    
1334
                    if (!do_not_decode[j]) {
1335
                        uint_fast8_t vqclass = classifs[j_times_ptns_to_read+partition_count];
1336
                        int_fast16_t vqbook = vr->books[vqclass][pass];
1337

    
1338
                        if (vqbook >= 0 && vc->codebooks[vqbook].codevectors) {
1339
                            uint_fast16_t coffs;
1340
                            unsigned dim =  vc->codebooks[vqbook].dimensions; // not uint_fast8_t: 64bit is slower here on amd64
1341
                            uint_fast16_t step = dim == 1 ? vr->partition_size
1342
                                                          : FASTDIV(vr->partition_size, dim);
1343
                            vorbis_codebook codebook = vc->codebooks[vqbook];
1344

    
1345
                            if (vr_type == 0) {
1346

    
1347
                                voffs = voffset+j*vlen;
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)
1351
                                        vec[voffs + k + l * step] += codebook.codevectors[coffs + l];  // FPMATH
1352
                                }
1353
                            } else if (vr_type == 1) {
1354
                                voffs = voffset + j * vlen;
1355
                                for (k = 0; k < step; ++k) {
1356
                                    coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1357
                                    for (l = 0; l < dim; ++l, ++voffs) {
1358
                                        vec[voffs]+=codebook.codevectors[coffs+l];  // FPMATH
1359

    
1360
                                        AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d  \n", pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);
1361
                                    }
1362
                                }
1363
                            } else if (vr_type == 2 && ch == 2 && (voffset & 1) == 0 && (dim & 1) == 0) { // most frequent case optimized
1364
                                voffs = voffset >> 1;
1365

    
1366
                                if (dim == 2) {
1367
                                    for (k = 0; k < step; ++k) {
1368
                                        coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;
1369
                                        vec[voffs + k       ] += codebook.codevectors[coffs    ];  // FPMATH
1370
                                        vec[voffs + k + vlen] += codebook.codevectors[coffs + 1];  // FPMATH
1371
                                    }
1372
                                } else if (dim == 4) {
1373
                                    for (k = 0; k < step; ++k, voffs += 2) {
1374
                                        coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4;
1375
                                        vec[voffs           ] += codebook.codevectors[coffs    ];  // FPMATH
1376
                                        vec[voffs + 1       ] += codebook.codevectors[coffs + 2];  // FPMATH
1377
                                        vec[voffs + vlen    ] += codebook.codevectors[coffs + 1];  // FPMATH
1378
                                        vec[voffs + vlen + 1] += codebook.codevectors[coffs + 3];  // FPMATH
1379
                                    }
1380
                                } else
1381
                                for (k = 0; k < step; ++k) {
1382
                                    coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1383
                                    for (l = 0; l < dim; l += 2, voffs++) {
1384
                                        vec[voffs       ] += codebook.codevectors[coffs + l    ];  // FPMATH
1385
                                        vec[voffs + vlen] += codebook.codevectors[coffs + l + 1];  // FPMATH
1386

    
1387
                                        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);
1388
                                    }
1389
                                }
1390

    
1391
                            } else if (vr_type == 2) {
1392
                                voffs = voffset;
1393

    
1394
                                for (k = 0; k < step; ++k) {
1395
                                    coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1396
                                    for (l = 0; l < dim; ++l, ++voffs) {
1397
                                        vec[voffs / ch + (voffs % ch) * vlen] += codebook.codevectors[coffs + l];  // FPMATH FIXME use if and counter instead of / and %
1398

    
1399
                                        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);
1400
                                    }
1401
                                }
1402
                            }
1403
                        }
1404
                    }
1405
                    j_times_ptns_to_read += ptns_to_read;
1406
                }
1407
                ++partition_count;
1408
                voffset += vr->partition_size;
1409
            }
1410
        }
1411
    }
1412
    return 0;
1413
}
1414

    
1415
static inline int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr,
1416
                                        uint_fast8_t ch,
1417
                                        uint_fast8_t *do_not_decode,
1418
                                        float *vec, uint_fast16_t vlen)
1419
{
1420
    if (vr->type == 2)
1421
        return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 2);
1422
    else if (vr->type == 1)
1423
        return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 1);
1424
    else if (vr->type == 0)
1425
        return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 0);
1426
    else {
1427
        av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");
1428
        return -1;
1429
    }
1430
}
1431

    
1432
void vorbis_inverse_coupling(float *mag, float *ang, int blocksize)
1433
{
1434
    int i;
1435
    for (i = 0;  i < blocksize;  i++) {
1436
        if (mag[i] > 0.0) {
1437
            if (ang[i] > 0.0) {
1438
                ang[i] = mag[i] - ang[i];
1439
            } else {
1440
                float temp = ang[i];
1441
                ang[i]     = mag[i];
1442
                mag[i]    += temp;
1443
            }
1444
        } else {
1445
            if (ang[i] > 0.0) {
1446
                ang[i] += mag[i];
1447
            } else {
1448
                float temp = ang[i];
1449
                ang[i]     = mag[i];
1450
                mag[i]    -= temp;
1451
            }
1452
        }
1453
    }
1454
}
1455

    
1456
static void copy_normalize(float *dst, float *src, int len, int exp_bias,
1457
                           float add_bias)
1458
{
1459
    int i;
1460
    if (exp_bias) {
1461
        memcpy(dst, src, len * sizeof(float));
1462
    } else {
1463
        for (i = 0; i < len; i++)
1464
            dst[i] = src[i] + add_bias;
1465
    }
1466
}
1467

    
1468
// Decode the audio packet using the functions above
1469

    
1470
static int vorbis_parse_audio_packet(vorbis_context *vc)
1471
{
1472
    GetBitContext *gb = &vc->gb;
1473

    
1474
    uint_fast8_t previous_window = vc->previous_window;
1475
    uint_fast8_t mode_number;
1476
    uint_fast8_t blockflag;
1477
    uint_fast16_t blocksize;
1478
    int_fast32_t i,j;
1479
    uint_fast8_t no_residue[255];
1480
    uint_fast8_t do_not_decode[255];
1481
    vorbis_mapping *mapping;
1482
    float *ch_res_ptr   = vc->channel_residues;
1483
    float *ch_floor_ptr = vc->channel_floors;
1484
    uint_fast8_t res_chan[255];
1485
    uint_fast8_t res_num = 0;
1486
    int_fast16_t retlen  = 0;
1487
    float fadd_bias = vc->add_bias;
1488

    
1489
    if (get_bits1(gb)) {
1490
        av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");
1491
        return -1; // packet type not audio
1492
    }
1493

    
1494
    if (vc->mode_count == 1) {
1495
        mode_number = 0;
1496
    } else {
1497
        GET_VALIDATED_INDEX(mode_number, ilog(vc->mode_count-1), vc->mode_count)
1498
    }
1499
    vc->mode_number = mode_number;
1500
    mapping = &vc->mappings[vc->modes[mode_number].mapping];
1501

    
1502
    AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);
1503

    
1504
    blockflag = vc->modes[mode_number].blockflag;
1505
    blocksize = vc->blocksize[blockflag];
1506
    if (blockflag)
1507
        skip_bits(gb, 2); // previous_window, next_window
1508

    
1509
    memset(ch_res_ptr,   0, sizeof(float) * vc->audio_channels * blocksize / 2); //FIXME can this be removed ?
1510
    memset(ch_floor_ptr, 0, sizeof(float) * vc->audio_channels * blocksize / 2); //FIXME can this be removed ?
1511

    
1512
// Decode floor
1513

    
1514
    for (i = 0; i < vc->audio_channels; ++i) {
1515
        vorbis_floor *floor;
1516
        int ret;
1517
        if (mapping->submaps > 1) {
1518
            floor = &vc->floors[mapping->submap_floor[mapping->mux[i]]];
1519
        } else {
1520
            floor = &vc->floors[mapping->submap_floor[0]];
1521
        }
1522

    
1523
        ret = floor->decode(vc, &floor->data, ch_floor_ptr);
1524

    
1525
        if (ret < 0) {
1526
            av_log(vc->avccontext, AV_LOG_ERROR, "Invalid codebook in vorbis_floor_decode.\n");
1527
            return -1;
1528
        }
1529
        no_residue[i] = ret;
1530
        ch_floor_ptr += blocksize / 2;
1531
    }
1532

    
1533
// Nonzero vector propagate
1534

    
1535
    for (i = mapping->coupling_steps - 1; i >= 0; --i) {
1536
        if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {
1537
            no_residue[mapping->magnitude[i]] = 0;
1538
            no_residue[mapping->angle[i]]     = 0;
1539
        }
1540
    }
1541

    
1542
// Decode residue
1543

    
1544
    for (i = 0; i < mapping->submaps; ++i) {
1545
        vorbis_residue *residue;
1546
        uint_fast8_t ch = 0;
1547

    
1548
        for (j = 0; j < vc->audio_channels; ++j) {
1549
            if ((mapping->submaps == 1) || (i == mapping->mux[j])) {
1550
                res_chan[j] = res_num;
1551
                if (no_residue[j]) {
1552
                    do_not_decode[ch] = 1;
1553
                } else {
1554
                    do_not_decode[ch] = 0;
1555
                }
1556
                ++ch;
1557
                ++res_num;
1558
            }
1559
        }
1560
        residue = &vc->residues[mapping->submap_residue[i]];
1561
        vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);
1562

    
1563
        ch_res_ptr += ch * blocksize / 2;
1564
    }
1565

    
1566
// Inverse coupling
1567

    
1568
    for (i = mapping->coupling_steps - 1; i >= 0; --i) { //warning: i has to be signed
1569
        float *mag, *ang;
1570

    
1571
        mag = vc->channel_residues+res_chan[mapping->magnitude[i]] * blocksize / 2;
1572
        ang = vc->channel_residues+res_chan[mapping->angle[i]]     * blocksize / 2;
1573
        vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize / 2);
1574
    }
1575

    
1576
// Dotproduct, MDCT
1577

    
1578
    for (j = vc->audio_channels-1;j >= 0; j--) {
1579
        ch_floor_ptr = vc->channel_floors   + j           * blocksize / 2;
1580
        ch_res_ptr   = vc->channel_residues + res_chan[j] * blocksize / 2;
1581
        vc->dsp.vector_fmul(ch_floor_ptr, ch_floor_ptr, ch_res_ptr, blocksize / 2);
1582
        ff_imdct_half(&vc->mdct[blockflag], ch_res_ptr, ch_floor_ptr);
1583
    }
1584

    
1585
// Overlap/add, save data for next overlapping  FPMATH
1586

    
1587
    retlen = (blocksize + vc->blocksize[previous_window]) / 4;
1588
    for (j = 0; j < vc->audio_channels; j++) {
1589
        uint_fast16_t bs0 = vc->blocksize[0];
1590
        uint_fast16_t bs1 = vc->blocksize[1];
1591
        float *residue    = vc->channel_residues + res_chan[j] * blocksize / 2;
1592
        float *saved      = vc->saved + j * bs1 / 4;
1593
        float *ret        = vc->channel_floors + j * retlen;
1594
        float *buf        = residue;
1595
        const float *win  = vc->win[blockflag & previous_window];
1596

    
1597
        if (blockflag == previous_window) {
1598
            vc->dsp.vector_fmul_window(ret, saved, buf, win, fadd_bias, blocksize / 4);
1599
        } else if (blockflag > previous_window) {
1600
            vc->dsp.vector_fmul_window(ret, saved, buf, win, fadd_bias, bs0 / 4);
1601
            copy_normalize(ret+bs0/2, buf+bs0/4, (bs1-bs0)/4, vc->exp_bias, fadd_bias);
1602
        } else {
1603
            copy_normalize(ret, saved, (bs1 - bs0) / 4, vc->exp_bias, fadd_bias);
1604
            vc->dsp.vector_fmul_window(ret + (bs1 - bs0) / 4, saved + (bs1 - bs0) / 4, buf, win, fadd_bias, bs0 / 4);
1605
        }
1606
        memcpy(saved, buf + blocksize / 4, blocksize / 4 * sizeof(float));
1607
    }
1608

    
1609
    vc->previous_window = blockflag;
1610
    return retlen;
1611
}
1612

    
1613
// Return the decoded audio packet through the standard api
1614

    
1615
static int vorbis_decode_frame(AVCodecContext *avccontext,
1616
                               void *data, int *data_size,
1617
                               AVPacket *avpkt)
1618
{
1619
    const uint8_t *buf = avpkt->data;
1620
    int buf_size       = avpkt->size;
1621
    vorbis_context *vc = avccontext->priv_data ;
1622
    GetBitContext *gb = &(vc->gb);
1623
    const float *channel_ptrs[255];
1624
    int i;
1625

    
1626
    int_fast16_t len;
1627

    
1628
    if (!buf_size)
1629
        return 0;
1630

    
1631
    AV_DEBUG("packet length %d \n", buf_size);
1632

    
1633
    init_get_bits(gb, buf, buf_size*8);
1634

    
1635
    len = vorbis_parse_audio_packet(vc);
1636

    
1637
    if (len <= 0) {
1638
        *data_size = 0;
1639
        return buf_size;
1640
    }
1641

    
1642
    if (!vc->first_frame) {
1643
        vc->first_frame = 1;
1644
        *data_size = 0;
1645
        return buf_size ;
1646
    }
1647

    
1648
    AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);
1649

    
1650
    if (vc->audio_channels > 8) {
1651
        for (i = 0; i < vc->audio_channels; i++)
1652
            channel_ptrs[i] = vc->channel_floors + i * len;
1653
    } else {
1654
        for (i = 0; i < vc->audio_channels; i++)
1655
            channel_ptrs[i] = vc->channel_floors +
1656
                              len * ff_vorbis_channel_layout_offsets[vc->audio_channels - 1][i];
1657
    }
1658

    
1659
    vc->dsp.float_to_int16_interleave(data, channel_ptrs, len, vc->audio_channels);
1660
    *data_size = len * 2 * vc->audio_channels;
1661

    
1662
    return buf_size ;
1663
}
1664

    
1665
// Close decoder
1666

    
1667
static av_cold int vorbis_decode_close(AVCodecContext *avccontext)
1668
{
1669
    vorbis_context *vc = avccontext->priv_data;
1670

    
1671
    vorbis_free(vc);
1672

    
1673
    return 0 ;
1674
}
1675

    
1676
AVCodec vorbis_decoder = {
1677
    "vorbis",
1678
    AVMEDIA_TYPE_AUDIO,
1679
    CODEC_ID_VORBIS,
1680
    sizeof(vorbis_context),
1681
    vorbis_decode_init,
1682
    NULL,
1683
    vorbis_decode_close,
1684
    vorbis_decode_frame,
1685
    .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),
1686
    .channel_layouts = ff_vorbis_channel_layouts,
1687
};
1688