Statistics
| Branch: | Revision:

ffmpeg / libavcodec / vorbisdec.c @ d1be646e

History | View | Annotate | Download (61.1 KB)

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
 *
18
 * 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(uint_fast32_t 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_fast16_t 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
    uint_fast16_t 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
        uint_fast8_t ordered;
258
        uint_fast32_t t, used_entries = 0;
259
        uint_fast32_t entries;
260

    
261
        AV_DEBUG(" %d. Codebook \n", cb);
262

    
263
        if (get_bits(gb, 24) != 0x564342) {
264
            av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook setup data corrupt. \n", cb);
265
            goto error;
266
        }
267

    
268
        codebook_setup->dimensions=get_bits(gb, 16);
269
        if (codebook_setup->dimensions > 16 || codebook_setup->dimensions == 0) {
270
            av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook's dimension is invalid (%d). \n", cb, codebook_setup->dimensions);
271
            goto error;
272
        }
273
        entries = get_bits(gb, 24);
274
        if (entries > V_MAX_VLCS) {
275
            av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook has too many entries (%"PRIdFAST32"). \n", cb, entries);
276
            goto error;
277
        }
278

    
279
        ordered = get_bits1(gb);
280

    
281
        AV_DEBUG(" codebook_dimensions %d, codebook_entries %d \n", codebook_setup->dimensions, entries);
282

    
283
        if (!ordered) {
284
            uint_fast16_t ce;
285
            uint_fast8_t  flag;
286
            uint_fast8_t  sparse = get_bits1(gb);
287

    
288
            AV_DEBUG(" not ordered \n");
289

    
290
            if (sparse) {
291
                AV_DEBUG(" sparse \n");
292

    
293
                used_entries = 0;
294
                for (ce = 0; ce < entries; ++ce) {
295
                    flag = get_bits1(gb);
296
                    if (flag) {
297
                        tmp_vlc_bits[ce] = get_bits(gb, 5) + 1;
298
                        ++used_entries;
299
                    } else
300
                        tmp_vlc_bits[ce] = 0;
301
                }
302
            } else {
303
                AV_DEBUG(" not sparse \n");
304

    
305
                used_entries = entries;
306
                for (ce = 0; ce < entries; ++ce)
307
                    tmp_vlc_bits[ce] = get_bits(gb, 5) + 1;
308
            }
309
        } else {
310
            uint_fast16_t current_entry = 0;
311
            uint_fast8_t current_length = get_bits(gb, 5)+1;
312

    
313
            AV_DEBUG(" ordered, current length: %d \n", current_length);  //FIXME
314

    
315
            used_entries = entries;
316
            for (; current_entry < used_entries && current_length <= 32; ++current_length) {
317
                uint_fast16_t i, number;
318

    
319
                AV_DEBUG(" number bits: %d ", ilog(entries - current_entry));
320

    
321
                number = get_bits(gb, ilog(entries - current_entry));
322

    
323
                AV_DEBUG(" number: %d \n", number);
324

    
325
                for (i = current_entry; i < number+current_entry; ++i)
326
                    if (i < used_entries)
327
                        tmp_vlc_bits[i] = current_length;
328

    
329
                current_entry+=number;
330
            }
331
            if (current_entry>used_entries) {
332
                av_log(vc->avccontext, AV_LOG_ERROR, " More codelengths than codes in codebook. \n");
333
                goto error;
334
            }
335
        }
336

    
337
        codebook_setup->lookup_type = get_bits(gb, 4);
338

    
339
        AV_DEBUG(" lookup type: %d : %s \n", codebook_setup->lookup_type, codebook_setup->lookup_type ? "vq" : "no lookup");
340

    
341
// If the codebook is used for (inverse) VQ, calculate codevectors.
342

    
343
        if (codebook_setup->lookup_type == 1) {
344
            uint_fast16_t i, j, k;
345
            uint_fast16_t codebook_lookup_values = ff_vorbis_nth_root(entries, codebook_setup->dimensions);
346

    
347
            float codebook_minimum_value = vorbisfloat2float(get_bits_long(gb, 32));
348
            float codebook_delta_value   = vorbisfloat2float(get_bits_long(gb, 32));
349
            uint_fast8_t codebook_value_bits = get_bits(gb, 4)+1;
350
            uint_fast8_t codebook_sequence_p = get_bits1(gb);
351

    
352
            AV_DEBUG(" We expect %d numbers for building the codevectors. \n", codebook_lookup_values);
353
            AV_DEBUG("  delta %f minmum %f \n", codebook_delta_value, codebook_minimum_value);
354

    
355
            for (i = 0; i < codebook_lookup_values; ++i) {
356
                codebook_multiplicands[i] = get_bits(gb, codebook_value_bits);
357

    
358
                AV_DEBUG(" multiplicands*delta+minmum : %e \n", (float)codebook_multiplicands[i]*codebook_delta_value+codebook_minimum_value);
359
                AV_DEBUG(" multiplicand %d \n", codebook_multiplicands[i]);
360
            }
361

    
362
// Weed out unused vlcs and build codevector vector
363
            codebook_setup->codevectors = used_entries ? av_mallocz(used_entries *
364
                                                                    codebook_setup->dimensions *
365
                                                                    sizeof(*codebook_setup->codevectors))
366
                                                       : NULL;
367
            for (j = 0, i = 0; i < entries; ++i) {
368
                uint_fast8_t dim = codebook_setup->dimensions;
369

    
370
                if (tmp_vlc_bits[i]) {
371
                    float last = 0.0;
372
                    uint_fast32_t lookup_offset = i;
373

    
374
#ifdef V_DEBUG
375
                    av_log(vc->avccontext, AV_LOG_INFO, "Lookup offset %d ,", i);
376
#endif
377

    
378
                    for (k = 0; k < dim; ++k) {
379
                        uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values;
380
                        codebook_setup->codevectors[j * dim + k] = codebook_multiplicands[multiplicand_offset] * codebook_delta_value + codebook_minimum_value + last;
381
                        if (codebook_sequence_p)
382
                            last = codebook_setup->codevectors[j * dim + k];
383
                        lookup_offset/=codebook_lookup_values;
384
                    }
385
                    tmp_vlc_bits[j] = tmp_vlc_bits[i];
386

    
387
#ifdef V_DEBUG
388
                    av_log(vc->avccontext, AV_LOG_INFO, "real lookup offset %d, vector: ", j);
389
                    for (k = 0; k < dim; ++k)
390
                        av_log(vc->avccontext, AV_LOG_INFO, " %f ", codebook_setup->codevectors[j * dim + k]);
391
                    av_log(vc->avccontext, AV_LOG_INFO, "\n");
392
#endif
393

    
394
                    ++j;
395
                }
396
            }
397
            if (j != used_entries) {
398
                av_log(vc->avccontext, AV_LOG_ERROR, "Bug in codevector vector building code. \n");
399
                goto error;
400
            }
401
            entries = used_entries;
402
        } else if (codebook_setup->lookup_type >= 2) {
403
            av_log(vc->avccontext, AV_LOG_ERROR, "Codebook lookup type not supported. \n");
404
            goto error;
405
        }
406

    
407
// Initialize VLC table
408
        if (ff_vorbis_len2vlc(tmp_vlc_bits, tmp_vlc_codes, entries)) {
409
            av_log(vc->avccontext, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");
410
            goto error;
411
        }
412
        codebook_setup->maxdepth = 0;
413
        for (t = 0; t < entries; ++t)
414
            if (tmp_vlc_bits[t] >= codebook_setup->maxdepth)
415
                codebook_setup->maxdepth = tmp_vlc_bits[t];
416

    
417
        if (codebook_setup->maxdepth > 3 * V_NB_BITS)
418
            codebook_setup->nb_bits = V_NB_BITS2;
419
        else
420
            codebook_setup->nb_bits = V_NB_BITS;
421

    
422
        codebook_setup->maxdepth = (codebook_setup->maxdepth+codebook_setup->nb_bits - 1) / codebook_setup->nb_bits;
423

    
424
        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)) {
425
            av_log(vc->avccontext, AV_LOG_ERROR, " Error generating vlc tables. \n");
426
            goto error;
427
        }
428
    }
429

    
430
    av_free(tmp_vlc_bits);
431
    av_free(tmp_vlc_codes);
432
    av_free(codebook_multiplicands);
433
    return 0;
434

    
435
// Error:
436
error:
437
    av_free(tmp_vlc_bits);
438
    av_free(tmp_vlc_codes);
439
    av_free(codebook_multiplicands);
440
    return -1;
441
}
442

    
443
// Process time domain transforms part (unused in Vorbis I)
444

    
445
static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc)
446
{
447
    GetBitContext *gb = &vc->gb;
448
    uint_fast8_t i;
449
    uint_fast8_t vorbis_time_count = get_bits(gb, 6) + 1;
450

    
451
    for (i = 0; i < vorbis_time_count; ++i) {
452
        uint_fast16_t vorbis_tdtransform = get_bits(gb, 16);
453

    
454
        AV_DEBUG(" Vorbis time domain transform %d: %d \n", vorbis_time_count, vorbis_tdtransform);
455

    
456
        if (vorbis_tdtransform) {
457
            av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n");
458
            return -1;
459
        }
460
    }
461
    return 0;
462
}
463

    
464
// Process floors part
465

    
466
static int vorbis_floor0_decode(vorbis_context *vc,
467
                                vorbis_floor_data *vfu, float *vec);
468
static void create_map(vorbis_context *vc, uint_fast8_t floor_number);
469
static int vorbis_floor1_decode(vorbis_context *vc,
470
                                vorbis_floor_data *vfu, float *vec);
471
static int vorbis_parse_setup_hdr_floors(vorbis_context *vc)
472
{
473
    GetBitContext *gb = &vc->gb;
474
    int i,j,k;
475

    
476
    vc->floor_count = get_bits(gb, 6) + 1;
477

    
478
    vc->floors = av_mallocz(vc->floor_count * sizeof(*vc->floors));
479

    
480
    for (i = 0; i < vc->floor_count; ++i) {
481
        vorbis_floor *floor_setup = &vc->floors[i];
482

    
483
        floor_setup->floor_type = get_bits(gb, 16);
484

    
485
        AV_DEBUG(" %d. floor type %d \n", i, floor_setup->floor_type);
486

    
487
        if (floor_setup->floor_type == 1) {
488
            int maximum_class = -1;
489
            uint_fast8_t  rangebits;
490
            uint_fast32_t rangemax;
491
            uint_fast16_t floor1_values = 2;
492

    
493
            floor_setup->decode = vorbis_floor1_decode;
494

    
495
            floor_setup->data.t1.partitions = get_bits(gb, 5);
496

    
497
            AV_DEBUG(" %d.floor: %d partitions \n", i, floor_setup->data.t1.partitions);
498

    
499
            for (j = 0; j < floor_setup->data.t1.partitions; ++j) {
500
                floor_setup->data.t1.partition_class[j] = get_bits(gb, 4);
501
                if (floor_setup->data.t1.partition_class[j] > maximum_class)
502
                    maximum_class = floor_setup->data.t1.partition_class[j];
503

    
504
                AV_DEBUG(" %d. floor %d partition class %d \n", i, j, floor_setup->data.t1.partition_class[j]);
505

    
506
            }
507

    
508
            AV_DEBUG(" maximum class %d \n", maximum_class);
509

    
510
            for (j = 0; j <= maximum_class; ++j) {
511
                floor_setup->data.t1.class_dimensions[j] = get_bits(gb, 3) + 1;
512
                floor_setup->data.t1.class_subclasses[j] = get_bits(gb, 2);
513

    
514
                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]);
515

    
516
                if (floor_setup->data.t1.class_subclasses[j]) {
517
                    GET_VALIDATED_INDEX(floor_setup->data.t1.class_masterbook[j], 8, vc->codebook_count)
518

    
519
                    AV_DEBUG("   masterbook: %d \n", floor_setup->data.t1.class_masterbook[j]);
520
                }
521

    
522
                for (k = 0; k < (1 << floor_setup->data.t1.class_subclasses[j]); ++k) {
523
                    int16_t bits = get_bits(gb, 8) - 1;
524
                    if (bits != -1)
525
                        VALIDATE_INDEX(bits, vc->codebook_count)
526
                    floor_setup->data.t1.subclass_books[j][k] = bits;
527

    
528
                    AV_DEBUG("    book %d. : %d \n", k, floor_setup->data.t1.subclass_books[j][k]);
529
                }
530
            }
531

    
532
            floor_setup->data.t1.multiplier = get_bits(gb, 2) + 1;
533
            floor_setup->data.t1.x_list_dim = 2;
534

    
535
            for (j = 0; j < floor_setup->data.t1.partitions; ++j)
536
                floor_setup->data.t1.x_list_dim+=floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];
537

    
538
            floor_setup->data.t1.list = av_mallocz(floor_setup->data.t1.x_list_dim *
539
                                                   sizeof(*floor_setup->data.t1.list));
540

    
541

    
542
            rangebits = get_bits(gb, 4);
543
            rangemax = (1 << rangebits);
544
            if (rangemax > vc->blocksize[1] / 2) {
545
                av_log(vc->avccontext, AV_LOG_ERROR,
546
                       "Floor value is too large for blocksize: %"PRIuFAST32" (%"PRIuFAST32")\n",
547
                       rangemax, vc->blocksize[1] / 2);
548
                return -1;
549
            }
550
            floor_setup->data.t1.list[0].x = 0;
551
            floor_setup->data.t1.list[1].x = rangemax;
552

    
553
            for (j = 0; j < floor_setup->data.t1.partitions; ++j) {
554
                for (k = 0; k < floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]]; ++k, ++floor1_values) {
555
                    floor_setup->data.t1.list[floor1_values].x = get_bits(gb, rangebits);
556

    
557
                    AV_DEBUG(" %d. floor1 Y coord. %d \n", floor1_values, floor_setup->data.t1.list[floor1_values].x);
558
                }
559
            }
560

    
561
// Precalculate order of x coordinates - needed for decode
562
            ff_vorbis_ready_floor1_list(floor_setup->data.t1.list, floor_setup->data.t1.x_list_dim);
563
        } else if (floor_setup->floor_type == 0) {
564
            uint_fast8_t max_codebook_dim = 0;
565

    
566
            floor_setup->decode = vorbis_floor0_decode;
567

    
568
            floor_setup->data.t0.order          = get_bits(gb,  8);
569
            floor_setup->data.t0.rate           = get_bits(gb, 16);
570
            floor_setup->data.t0.bark_map_size  = get_bits(gb, 16);
571
            floor_setup->data.t0.amplitude_bits = get_bits(gb,  6);
572
            /* zero would result in a div by zero later *
573
             * 2^0 - 1 == 0                             */
574
            if (floor_setup->data.t0.amplitude_bits == 0) {
575
                av_log(vc->avccontext, AV_LOG_ERROR,
576
                       "Floor 0 amplitude bits is 0.\n");
577
                return -1;
578
            }
579
            floor_setup->data.t0.amplitude_offset = get_bits(gb, 8);
580
            floor_setup->data.t0.num_books        = get_bits(gb, 4) + 1;
581

    
582
            /* allocate mem for booklist */
583
            floor_setup->data.t0.book_list =
584
                av_malloc(floor_setup->data.t0.num_books);
585
            if (!floor_setup->data.t0.book_list)
586
                return -1;
587
            /* read book indexes */
588
            {
589
                int idx;
590
                uint_fast8_t book_idx;
591
                for (idx = 0; idx < floor_setup->data.t0.num_books; ++idx) {
592
                    GET_VALIDATED_INDEX(book_idx, 8, vc->codebook_count)
593
                    floor_setup->data.t0.book_list[idx] = book_idx;
594
                    if (vc->codebooks[book_idx].dimensions > max_codebook_dim)
595
                        max_codebook_dim = vc->codebooks[book_idx].dimensions;
596
                }
597
            }
598

    
599
            create_map(vc, i);
600

    
601
            /* codebook dim is for padding if codebook dim doesn't *
602
             * divide order+1 then we need to read more data       */
603
            floor_setup->data.t0.lsp =
604
                av_malloc((floor_setup->data.t0.order + 1 + max_codebook_dim)
605
                          * sizeof(*floor_setup->data.t0.lsp));
606
            if (!floor_setup->data.t0.lsp)
607
                return -1;
608

    
609
#ifdef V_DEBUG /* debug output parsed headers */
610
            AV_DEBUG("floor0 order: %u\n", floor_setup->data.t0.order);
611
            AV_DEBUG("floor0 rate: %u\n", floor_setup->data.t0.rate);
612
            AV_DEBUG("floor0 bark map size: %u\n",
613
                     floor_setup->data.t0.bark_map_size);
614
            AV_DEBUG("floor0 amplitude bits: %u\n",
615
                     floor_setup->data.t0.amplitude_bits);
616
            AV_DEBUG("floor0 amplitude offset: %u\n",
617
                     floor_setup->data.t0.amplitude_offset);
618
            AV_DEBUG("floor0 number of books: %u\n",
619
                     floor_setup->data.t0.num_books);
620
            AV_DEBUG("floor0 book list pointer: %p\n",
621
                     floor_setup->data.t0.book_list);
622
            {
623
                int idx;
624
                for (idx = 0; idx < floor_setup->data.t0.num_books; ++idx) {
625
                    AV_DEBUG("  Book %d: %u\n",
626
                             idx+1,
627
                             floor_setup->data.t0.book_list[idx]);
628
                }
629
            }
630
#endif
631
        } else {
632
            av_log(vc->avccontext, AV_LOG_ERROR, "Invalid floor type!\n");
633
            return -1;
634
        }
635
    }
636
    return 0;
637
}
638

    
639
// Process residues part
640

    
641
static int vorbis_parse_setup_hdr_residues(vorbis_context *vc)
642
{
643
    GetBitContext *gb = &vc->gb;
644
    uint_fast8_t i, j, k;
645

    
646
    vc->residue_count = get_bits(gb, 6)+1;
647
    vc->residues      = av_mallocz(vc->residue_count * sizeof(*vc->residues));
648

    
649
    AV_DEBUG(" There are %d residues. \n", vc->residue_count);
650

    
651
    for (i = 0; i < vc->residue_count; ++i) {
652
        vorbis_residue *res_setup = &vc->residues[i];
653
        uint_fast8_t cascade[64];
654
        uint_fast8_t high_bits;
655
        uint_fast8_t low_bits;
656

    
657
        res_setup->type = get_bits(gb, 16);
658

    
659
        AV_DEBUG(" %d. residue type %d \n", i, res_setup->type);
660

    
661
        res_setup->begin          = get_bits(gb, 24);
662
        res_setup->end            = get_bits(gb, 24);
663
        res_setup->partition_size = get_bits(gb, 24) + 1;
664
        /* Validations to prevent a buffer overflow later. */
665
        if (res_setup->begin>res_setup->end ||
666
            res_setup->end > vc->avccontext->channels * vc->blocksize[1] / 2 ||
667
            (res_setup->end-res_setup->begin) / res_setup->partition_size > V_MAX_PARTITIONS) {
668
            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);
669
            return -1;
670
        }
671

    
672
        res_setup->classifications = get_bits(gb, 6) + 1;
673
        GET_VALIDATED_INDEX(res_setup->classbook, 8, vc->codebook_count)
674

    
675
        res_setup->ptns_to_read =
676
            (res_setup->end - res_setup->begin) / res_setup->partition_size;
677
        res_setup->classifs = av_malloc(res_setup->ptns_to_read *
678
                                        vc->audio_channels *
679
                                        sizeof(*res_setup->classifs));
680
        if (!res_setup->classifs)
681
            return AVERROR(ENOMEM);
682

    
683
        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,
684
          res_setup->classifications, res_setup->classbook);
685

    
686
        for (j = 0; j < res_setup->classifications; ++j) {
687
            high_bits = 0;
688
            low_bits  = get_bits(gb, 3);
689
            if (get_bits1(gb))
690
                high_bits = get_bits(gb, 5);
691
            cascade[j] = (high_bits << 3) + low_bits;
692

    
693
            AV_DEBUG("     %d class casscade depth: %d \n", j, ilog(cascade[j]));
694
        }
695

    
696
        res_setup->maxpass = 0;
697
        for (j = 0; j < res_setup->classifications; ++j) {
698
            for (k = 0; k < 8; ++k) {
699
                if (cascade[j]&(1 << k)) {
700
                    GET_VALIDATED_INDEX(res_setup->books[j][k], 8, vc->codebook_count)
701

    
702
                    AV_DEBUG("     %d class casscade depth %d book: %d \n", j, k, res_setup->books[j][k]);
703

    
704
                    if (k>res_setup->maxpass)
705
                        res_setup->maxpass = k;
706
                } else {
707
                    res_setup->books[j][k] = -1;
708
                }
709
            }
710
        }
711
    }
712
    return 0;
713
}
714

    
715
// Process mappings part
716

    
717
static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc)
718
{
719
    GetBitContext *gb = &vc->gb;
720
    uint_fast8_t i, j;
721

    
722
    vc->mapping_count = get_bits(gb, 6)+1;
723
    vc->mappings      = av_mallocz(vc->mapping_count * sizeof(*vc->mappings));
724

    
725
    AV_DEBUG(" There are %d mappings. \n", vc->mapping_count);
726

    
727
    for (i = 0; i < vc->mapping_count; ++i) {
728
        vorbis_mapping *mapping_setup = &vc->mappings[i];
729

    
730
        if (get_bits(gb, 16)) {
731
            av_log(vc->avccontext, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n");
732
            return -1;
733
        }
734
        if (get_bits1(gb)) {
735
            mapping_setup->submaps = get_bits(gb, 4) + 1;
736
        } else {
737
            mapping_setup->submaps = 1;
738
        }
739

    
740
        if (get_bits1(gb)) {
741
            mapping_setup->coupling_steps = get_bits(gb, 8) + 1;
742
            mapping_setup->magnitude      = av_mallocz(mapping_setup->coupling_steps *
743
                                                       sizeof(*mapping_setup->magnitude));
744
            mapping_setup->angle          = av_mallocz(mapping_setup->coupling_steps *
745
                                                       sizeof(*mapping_setup->angle));
746
            for (j = 0; j < mapping_setup->coupling_steps; ++j) {
747
                GET_VALIDATED_INDEX(mapping_setup->magnitude[j], ilog(vc->audio_channels - 1), vc->audio_channels)
748
                GET_VALIDATED_INDEX(mapping_setup->angle[j],     ilog(vc->audio_channels - 1), vc->audio_channels)
749
            }
750
        } else {
751
            mapping_setup->coupling_steps = 0;
752
        }
753

    
754
        AV_DEBUG("   %d mapping coupling steps: %d \n", i, mapping_setup->coupling_steps);
755

    
756
        if (get_bits(gb, 2)) {
757
            av_log(vc->avccontext, AV_LOG_ERROR, "%d. mapping setup data invalid. \n", i);
758
            return -1; // following spec.
759
        }
760

    
761
        if (mapping_setup->submaps>1) {
762
            mapping_setup->mux = av_mallocz(vc->audio_channels *
763
                                            sizeof(*mapping_setup->mux));
764
            for (j = 0; j < vc->audio_channels; ++j)
765
                mapping_setup->mux[j] = get_bits(gb, 4);
766
        }
767

    
768
        for (j = 0; j < mapping_setup->submaps; ++j) {
769
            skip_bits(gb, 8); // FIXME check?
770
            GET_VALIDATED_INDEX(mapping_setup->submap_floor[j],   8, vc->floor_count)
771
            GET_VALIDATED_INDEX(mapping_setup->submap_residue[j], 8, vc->residue_count)
772

    
773
            AV_DEBUG("   %d mapping %d submap : floor %d, residue %d \n", i, j, mapping_setup->submap_floor[j], mapping_setup->submap_residue[j]);
774
        }
775
    }
776
    return 0;
777
}
778

    
779
// Process modes part
780

    
781
static void create_map(vorbis_context *vc, uint_fast8_t floor_number)
782
{
783
    vorbis_floor *floors = vc->floors;
784
    vorbis_floor0 *vf;
785
    int idx;
786
    int_fast8_t blockflag;
787
    int_fast32_t *map;
788
    int_fast32_t n; //TODO: could theoretically be smaller?
789

    
790
    for (blockflag = 0; blockflag < 2; ++blockflag) {
791
        n = vc->blocksize[blockflag] / 2;
792
        floors[floor_number].data.t0.map[blockflag] =
793
            av_malloc((n+1) * sizeof(int_fast32_t)); // n + sentinel
794

    
795
        map =  floors[floor_number].data.t0.map[blockflag];
796
        vf  = &floors[floor_number].data.t0;
797

    
798
        for (idx = 0; idx < n; ++idx) {
799
            map[idx] = floor(BARK((vf->rate * idx) / (2.0f * n)) *
800
                             ((vf->bark_map_size) /
801
                              BARK(vf->rate / 2.0f)));
802
            if (vf->bark_map_size-1 < map[idx])
803
                map[idx] = vf->bark_map_size - 1;
804
        }
805
        map[n] = -1;
806
        vf->map_size[blockflag] = n;
807
    }
808

    
809
#ifdef V_DEBUG
810
    for (idx = 0; idx <= n; ++idx) {
811
        AV_DEBUG("floor0 map: map at pos %d is %d\n",
812
                 idx, map[idx]);
813
    }
814
#endif
815
}
816

    
817
static int vorbis_parse_setup_hdr_modes(vorbis_context *vc)
818
{
819
    GetBitContext *gb = &vc->gb;
820
    uint_fast8_t i;
821

    
822
    vc->mode_count = get_bits(gb, 6) + 1;
823
    vc->modes      = av_mallocz(vc->mode_count * sizeof(*vc->modes));
824

    
825
    AV_DEBUG(" There are %d modes.\n", vc->mode_count);
826

    
827
    for (i = 0; i < vc->mode_count; ++i) {
828
        vorbis_mode *mode_setup = &vc->modes[i];
829

    
830
        mode_setup->blockflag     = get_bits1(gb);
831
        mode_setup->windowtype    = get_bits(gb, 16); //FIXME check
832
        mode_setup->transformtype = get_bits(gb, 16); //FIXME check
833
        GET_VALIDATED_INDEX(mode_setup->mapping, 8, vc->mapping_count);
834

    
835
        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);
836
    }
837
    return 0;
838
}
839

    
840
// Process the whole setup header using the functions above
841

    
842
static int vorbis_parse_setup_hdr(vorbis_context *vc)
843
{
844
    GetBitContext *gb = &vc->gb;
845

    
846
    if ((get_bits(gb, 8) != 'v') || (get_bits(gb, 8) != 'o') ||
847
        (get_bits(gb, 8) != 'r') || (get_bits(gb, 8) != 'b') ||
848
        (get_bits(gb, 8) != 'i') || (get_bits(gb, 8) != 's')) {
849
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n");
850
        return -1;
851
    }
852

    
853
    if (vorbis_parse_setup_hdr_codebooks(vc)) {
854
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n");
855
        return -2;
856
    }
857
    if (vorbis_parse_setup_hdr_tdtransforms(vc)) {
858
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n");
859
        return -3;
860
    }
861
    if (vorbis_parse_setup_hdr_floors(vc)) {
862
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n");
863
        return -4;
864
    }
865
    if (vorbis_parse_setup_hdr_residues(vc)) {
866
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n");
867
        return -5;
868
    }
869
    if (vorbis_parse_setup_hdr_mappings(vc)) {
870
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n");
871
        return -6;
872
    }
873
    if (vorbis_parse_setup_hdr_modes(vc)) {
874
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n");
875
        return -7;
876
    }
877
    if (!get_bits1(gb)) {
878
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n");
879
        return -8; // framing flag bit unset error
880
    }
881

    
882
    return 0;
883
}
884

    
885
// Process the identification header
886

    
887
static int vorbis_parse_id_hdr(vorbis_context *vc)
888
{
889
    GetBitContext *gb = &vc->gb;
890
    uint_fast8_t bl0, bl1;
891

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

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

    
930
    if ((get_bits1(gb)) == 0) {
931
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n");
932
        return -2;
933
    }
934

    
935
    vc->channel_residues =  av_malloc((vc->blocksize[1]  / 2) * vc->audio_channels * sizeof(*vc->channel_residues));
936
    vc->channel_floors   =  av_malloc((vc->blocksize[1]  / 2) * vc->audio_channels * sizeof(*vc->channel_floors));
937
    vc->saved            =  av_mallocz((vc->blocksize[1] / 4) * vc->audio_channels * sizeof(*vc->saved));
938
    vc->previous_window  = 0;
939

    
940
    ff_mdct_init(&vc->mdct[0], bl0, 1, -vc->scale_bias);
941
    ff_mdct_init(&vc->mdct[1], bl1, 1, -vc->scale_bias);
942

    
943
    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 ",
944
            vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize[0], vc->blocksize[1]);
945

    
946
/*
947
    BLK = vc->blocksize[0];
948
    for (i = 0; i < BLK / 2; ++i) {
949
        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)));
950
    }
951
*/
952

    
953
    return 0;
954
}
955

    
956
// Process the extradata using the functions above (identification header, setup header)
957

    
958
static av_cold int vorbis_decode_init(AVCodecContext *avccontext)
959
{
960
    vorbis_context *vc = avccontext->priv_data ;
961
    uint8_t *headers   = avccontext->extradata;
962
    int headers_len    = avccontext->extradata_size;
963
    uint8_t *header_start[3];
964
    int header_len[3];
965
    GetBitContext *gb = &(vc->gb);
966
    int hdr_type;
967

    
968
    vc->avccontext = avccontext;
969
    dsputil_init(&vc->dsp, avccontext);
970
    ff_fmt_convert_init(&vc->fmt_conv, avccontext);
971

    
972
    vc->scale_bias = 32768.0f;
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
        }
1048
        AV_DEBUG("floor0 dec: booknumber: %u\n", book_idx);
1049
        codebook = vc->codebooks[vf->book_list[book_idx]];
1050
        /* Invalid codebook! */
1051
        if (!codebook.codevectors)
1052
            return -1;
1053

    
1054
        while (lsp_len<vf->order) {
1055
            int vec_off;
1056

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

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

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

    
1086
            for (i = 0; i < order; i++)
1087
                lsp[i] = 2.0f * cos(lsp[i]);
1088

    
1089
            AV_DEBUG("floor0 synth: map_size = %d; m = %d; wstep = %f\n",
1090
                     vf->map_size, order, wstep);
1091

    
1092
            i = 0;
1093
            while (i < vf->map_size[blockflag]) {
1094
                int j, iter_cond = vf->map[blockflag][i];
1095
                float p = 0.5f;
1096
                float q = 0.5f;
1097
                float two_cos_w = 2.0f * cos(wstep * iter_cond); // needed all times
1098

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

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

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

    
1120
                /* fill vector */
1121
                do {
1122
                    vec[i] = q; ++i;
1123
                } while (vf->map[blockflag][i] == iter_cond);
1124
            }
1125
        }
1126
    } else {
1127
        /* this channel is unused */
1128
        return 1;
1129
    }
1130

    
1131
    AV_DEBUG(" Floor0 decoded\n");
1132

    
1133
    return 0;
1134
}
1135

    
1136
static int vorbis_floor1_decode(vorbis_context *vc,
1137
                                vorbis_floor_data *vfu, float *vec)
1138
{
1139
    vorbis_floor1 *vf = &vfu->t1;
1140
    GetBitContext *gb = &vc->gb;
1141
    uint_fast16_t range_v[4] = { 256, 128, 86, 64 };
1142
    uint_fast16_t range = range_v[vf->multiplier-1];
1143
    uint_fast16_t floor1_Y[258];
1144
    uint_fast16_t floor1_Y_final[258];
1145
    int floor1_flag[258];
1146
    uint_fast8_t class;
1147
    uint_fast8_t cdim;
1148
    uint_fast8_t cbits;
1149
    uint_fast8_t csub;
1150
    uint_fast8_t cval;
1151
    int_fast16_t book;
1152
    uint_fast16_t offset;
1153
    uint_fast16_t i,j;
1154
    int_fast16_t adx, ady, dy, off, predicted;
1155
    int_fast32_t err;
1156

    
1157

    
1158
    if (!get_bits1(gb)) // silence
1159
        return 1;
1160

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

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

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

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

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

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

    
1182
        for (j = 0; j < cdim; ++j) {
1183
            book = vf->subclass_books[class][cval & csub];
1184

    
1185
            AV_DEBUG("book %d Cbits %d cval %d  bits:%d \n", book, cbits, cval, get_bits_count(gb));
1186

    
1187
            cval = cval >> cbits;
1188
            if (book > -1) {
1189
                floor1_Y[offset+j] = get_vlc2(gb, vc->codebooks[book].vlc.table,
1190
                vc->codebooks[book].nb_bits, 3);
1191
            } else {
1192
                floor1_Y[offset+j] = 0;
1193
            }
1194

    
1195
            AV_DEBUG(" floor(%d) = %d \n", vf->list[offset+j].x, floor1_Y[offset+j]);
1196
        }
1197
        offset+=cdim;
1198
    }
1199

    
1200
// Amplitude calculation from the differences
1201

    
1202
    floor1_flag[0] = 1;
1203
    floor1_flag[1] = 1;
1204
    floor1_Y_final[0] = floor1_Y[0];
1205
    floor1_Y_final[1] = floor1_Y[1];
1206

    
1207
    for (i = 2; i < vf->x_list_dim; ++i) {
1208
        uint_fast16_t val, highroom, lowroom, room;
1209
        uint_fast16_t high_neigh_offs;
1210
        uint_fast16_t low_neigh_offs;
1211

    
1212
        low_neigh_offs  = vf->list[i].low;
1213
        high_neigh_offs = vf->list[i].high;
1214
        dy  = floor1_Y_final[high_neigh_offs] - floor1_Y_final[low_neigh_offs];  // render_point begin
1215
        adx = vf->list[high_neigh_offs].x - vf->list[low_neigh_offs].x;
1216
        ady = FFABS(dy);
1217
        err = ady * (vf->list[i].x - vf->list[low_neigh_offs].x);
1218
        off = err / adx;
1219
        if (dy < 0) {
1220
            predicted = floor1_Y_final[low_neigh_offs] - off;
1221
        } else {
1222
            predicted = floor1_Y_final[low_neigh_offs] + off;
1223
        } // render_point end
1224

    
1225
        val = floor1_Y[i];
1226
        highroom = range-predicted;
1227
        lowroom  = predicted;
1228
        if (highroom < lowroom) {
1229
            room = highroom * 2;
1230
        } else {
1231
            room = lowroom * 2;   // SPEC mispelling
1232
        }
1233
        if (val) {
1234
            floor1_flag[low_neigh_offs]  = 1;
1235
            floor1_flag[high_neigh_offs] = 1;
1236
            floor1_flag[i]               = 1;
1237
            if (val >= room) {
1238
                if (highroom > lowroom) {
1239
                    floor1_Y_final[i] = val - lowroom + predicted;
1240
                } else {
1241
                    floor1_Y_final[i] = predicted - val + highroom - 1;
1242
                }
1243
            } else {
1244
                if (val & 1) {
1245
                    floor1_Y_final[i] = predicted - (val + 1) / 2;
1246
                } else {
1247
                    floor1_Y_final[i] = predicted + val / 2;
1248
                }
1249
            }
1250
        } else {
1251
            floor1_flag[i]    = 0;
1252
            floor1_Y_final[i] = predicted;
1253
        }
1254

    
1255
        AV_DEBUG(" Decoded floor(%d) = %d / val %d \n", vf->list[i].x, floor1_Y_final[i], val);
1256
    }
1257

    
1258
// Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?
1259

    
1260
    ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);
1261

    
1262
    AV_DEBUG(" Floor decoded\n");
1263

    
1264
    return 0;
1265
}
1266

    
1267
// Read and decode residue
1268

    
1269
static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc,
1270
                                                           vorbis_residue *vr,
1271
                                                           uint_fast8_t ch,
1272
                                                           uint_fast8_t *do_not_decode,
1273
                                                           float *vec,
1274
                                                           uint_fast16_t vlen,
1275
                                                           int vr_type)
1276
{
1277
    GetBitContext *gb = &vc->gb;
1278
    uint_fast8_t c_p_c = vc->codebooks[vr->classbook].dimensions;
1279
    uint_fast16_t ptns_to_read = vr->ptns_to_read;
1280
    uint8_t *classifs = vr->classifs;
1281
    uint_fast8_t pass;
1282
    uint_fast8_t ch_used;
1283
    uint_fast8_t i,j,l;
1284
    uint_fast16_t k;
1285

    
1286
    if (vr_type == 2) {
1287
        for (j = 1; j < ch; ++j)
1288
            do_not_decode[0] &= do_not_decode[j];  // FIXME - clobbering input
1289
        if (do_not_decode[0])
1290
            return 0;
1291
        ch_used = 1;
1292
    } else {
1293
        ch_used = ch;
1294
    }
1295

    
1296
    AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);
1297

    
1298
    for (pass = 0; pass <= vr->maxpass; ++pass) { // FIXME OPTIMIZE?
1299
        uint_fast16_t voffset;
1300
        uint_fast16_t partition_count;
1301
        uint_fast16_t j_times_ptns_to_read;
1302

    
1303
        voffset = vr->begin;
1304
        for (partition_count = 0; partition_count < ptns_to_read;) {  // SPEC        error
1305
            if (!pass) {
1306
                uint_fast32_t inverse_class = ff_inverse[vr->classifications];
1307
                for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {
1308
                    if (!do_not_decode[j]) {
1309
                        uint_fast32_t temp = get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,
1310
                        vc->codebooks[vr->classbook].nb_bits, 3);
1311

    
1312
                        AV_DEBUG("Classword: %d \n", temp);
1313

    
1314
                        assert(vr->classifications > 1 && temp <= 65536); //needed for inverse[]
1315
                        for (i = 0; i < c_p_c; ++i) {
1316
                            uint_fast32_t temp2;
1317

    
1318
                            temp2 = (((uint_fast64_t)temp) * inverse_class) >> 32;
1319
                            if (partition_count + c_p_c - 1 - i < ptns_to_read)
1320
                                classifs[j_times_ptns_to_read + partition_count + c_p_c - 1 - i] = temp - temp2 * vr->classifications;
1321
                            temp = temp2;
1322
                        }
1323
                    }
1324
                    j_times_ptns_to_read += ptns_to_read;
1325
                }
1326
            }
1327
            for (i = 0; (i < c_p_c) && (partition_count < ptns_to_read); ++i) {
1328
                for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {
1329
                    uint_fast16_t voffs;
1330

    
1331
                    if (!do_not_decode[j]) {
1332
                        uint_fast8_t vqclass = classifs[j_times_ptns_to_read+partition_count];
1333
                        int_fast16_t vqbook = vr->books[vqclass][pass];
1334

    
1335
                        if (vqbook >= 0 && vc->codebooks[vqbook].codevectors) {
1336
                            uint_fast16_t coffs;
1337
                            unsigned dim =  vc->codebooks[vqbook].dimensions; // not uint_fast8_t: 64bit is slower here on amd64
1338
                            uint_fast16_t step = dim == 1 ? vr->partition_size
1339
                                                          : FASTDIV(vr->partition_size, dim);
1340
                            vorbis_codebook codebook = vc->codebooks[vqbook];
1341

    
1342
                            if (vr_type == 0) {
1343

    
1344
                                voffs = voffset+j*vlen;
1345
                                for (k = 0; k < step; ++k) {
1346
                                    coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1347
                                    for (l = 0; l < dim; ++l)
1348
                                        vec[voffs + k + l * step] += codebook.codevectors[coffs + l];  // FPMATH
1349
                                }
1350
                            } else if (vr_type == 1) {
1351
                                voffs = voffset + j * vlen;
1352
                                for (k = 0; k < step; ++k) {
1353
                                    coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1354
                                    for (l = 0; l < dim; ++l, ++voffs) {
1355
                                        vec[voffs]+=codebook.codevectors[coffs+l];  // FPMATH
1356

    
1357
                                        AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d  \n", pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);
1358
                                    }
1359
                                }
1360
                            } else if (vr_type == 2 && ch == 2 && (voffset & 1) == 0 && (dim & 1) == 0) { // most frequent case optimized
1361
                                voffs = voffset >> 1;
1362

    
1363
                                if (dim == 2) {
1364
                                    for (k = 0; k < step; ++k) {
1365
                                        coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;
1366
                                        vec[voffs + k       ] += codebook.codevectors[coffs    ];  // FPMATH
1367
                                        vec[voffs + k + vlen] += codebook.codevectors[coffs + 1];  // FPMATH
1368
                                    }
1369
                                } else if (dim == 4) {
1370
                                    for (k = 0; k < step; ++k, voffs += 2) {
1371
                                        coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4;
1372
                                        vec[voffs           ] += codebook.codevectors[coffs    ];  // FPMATH
1373
                                        vec[voffs + 1       ] += codebook.codevectors[coffs + 2];  // FPMATH
1374
                                        vec[voffs + vlen    ] += codebook.codevectors[coffs + 1];  // FPMATH
1375
                                        vec[voffs + vlen + 1] += codebook.codevectors[coffs + 3];  // FPMATH
1376
                                    }
1377
                                } else
1378
                                for (k = 0; k < step; ++k) {
1379
                                    coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1380
                                    for (l = 0; l < dim; l += 2, voffs++) {
1381
                                        vec[voffs       ] += codebook.codevectors[coffs + l    ];  // FPMATH
1382
                                        vec[voffs + vlen] += codebook.codevectors[coffs + l + 1];  // FPMATH
1383

    
1384
                                        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);
1385
                                    }
1386
                                }
1387

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

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

    
1396
                                        AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d+%d  \n", pass, voffset / ch + (voffs % ch) * vlen, vec[voffset / ch + (voffs % ch) * vlen], codebook.codevectors[coffs + l], coffs, l);
1397
                                    }
1398
                                }
1399
                            }
1400
                        }
1401
                    }
1402
                    j_times_ptns_to_read += ptns_to_read;
1403
                }
1404
                ++partition_count;
1405
                voffset += vr->partition_size;
1406
            }
1407
        }
1408
    }
1409
    return 0;
1410
}
1411

    
1412
static inline int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr,
1413
                                        uint_fast8_t ch,
1414
                                        uint_fast8_t *do_not_decode,
1415
                                        float *vec, uint_fast16_t vlen)
1416
{
1417
    if (vr->type == 2)
1418
        return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 2);
1419
    else if (vr->type == 1)
1420
        return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 1);
1421
    else if (vr->type == 0)
1422
        return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 0);
1423
    else {
1424
        av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");
1425
        return -1;
1426
    }
1427
}
1428

    
1429
void vorbis_inverse_coupling(float *mag, float *ang, int blocksize)
1430
{
1431
    int i;
1432
    for (i = 0;  i < blocksize;  i++) {
1433
        if (mag[i] > 0.0) {
1434
            if (ang[i] > 0.0) {
1435
                ang[i] = mag[i] - ang[i];
1436
            } else {
1437
                float temp = ang[i];
1438
                ang[i]     = mag[i];
1439
                mag[i]    += temp;
1440
            }
1441
        } else {
1442
            if (ang[i] > 0.0) {
1443
                ang[i] += mag[i];
1444
            } else {
1445
                float temp = ang[i];
1446
                ang[i]     = mag[i];
1447
                mag[i]    -= temp;
1448
            }
1449
        }
1450
    }
1451
}
1452

    
1453
// Decode the audio packet using the functions above
1454

    
1455
static int vorbis_parse_audio_packet(vorbis_context *vc)
1456
{
1457
    GetBitContext *gb = &vc->gb;
1458
    FFTContext *mdct;
1459
    uint_fast8_t previous_window = vc->previous_window;
1460
    uint_fast8_t mode_number;
1461
    uint_fast8_t blockflag;
1462
    uint_fast16_t blocksize;
1463
    int_fast32_t i,j;
1464
    uint_fast8_t no_residue[255];
1465
    uint_fast8_t do_not_decode[255];
1466
    vorbis_mapping *mapping;
1467
    float *ch_res_ptr   = vc->channel_residues;
1468
    float *ch_floor_ptr = vc->channel_floors;
1469
    uint_fast8_t res_chan[255];
1470
    uint_fast8_t res_num = 0;
1471
    int_fast16_t retlen  = 0;
1472

    
1473
    if (get_bits1(gb)) {
1474
        av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");
1475
        return -1; // packet type not audio
1476
    }
1477

    
1478
    if (vc->mode_count == 1) {
1479
        mode_number = 0;
1480
    } else {
1481
        GET_VALIDATED_INDEX(mode_number, ilog(vc->mode_count-1), vc->mode_count)
1482
    }
1483
    vc->mode_number = mode_number;
1484
    mapping = &vc->mappings[vc->modes[mode_number].mapping];
1485

    
1486
    AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);
1487

    
1488
    blockflag = vc->modes[mode_number].blockflag;
1489
    blocksize = vc->blocksize[blockflag];
1490
    if (blockflag)
1491
        skip_bits(gb, 2); // previous_window, next_window
1492

    
1493
    memset(ch_res_ptr,   0, sizeof(float) * vc->audio_channels * blocksize / 2); //FIXME can this be removed ?
1494
    memset(ch_floor_ptr, 0, sizeof(float) * vc->audio_channels * blocksize / 2); //FIXME can this be removed ?
1495

    
1496
// Decode floor
1497

    
1498
    for (i = 0; i < vc->audio_channels; ++i) {
1499
        vorbis_floor *floor;
1500
        int ret;
1501
        if (mapping->submaps > 1) {
1502
            floor = &vc->floors[mapping->submap_floor[mapping->mux[i]]];
1503
        } else {
1504
            floor = &vc->floors[mapping->submap_floor[0]];
1505
        }
1506

    
1507
        ret = floor->decode(vc, &floor->data, ch_floor_ptr);
1508

    
1509
        if (ret < 0) {
1510
            av_log(vc->avccontext, AV_LOG_ERROR, "Invalid codebook in vorbis_floor_decode.\n");
1511
            return -1;
1512
        }
1513
        no_residue[i] = ret;
1514
        ch_floor_ptr += blocksize / 2;
1515
    }
1516

    
1517
// Nonzero vector propagate
1518

    
1519
    for (i = mapping->coupling_steps - 1; i >= 0; --i) {
1520
        if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {
1521
            no_residue[mapping->magnitude[i]] = 0;
1522
            no_residue[mapping->angle[i]]     = 0;
1523
        }
1524
    }
1525

    
1526
// Decode residue
1527

    
1528
    for (i = 0; i < mapping->submaps; ++i) {
1529
        vorbis_residue *residue;
1530
        uint_fast8_t ch = 0;
1531

    
1532
        for (j = 0; j < vc->audio_channels; ++j) {
1533
            if ((mapping->submaps == 1) || (i == mapping->mux[j])) {
1534
                res_chan[j] = res_num;
1535
                if (no_residue[j]) {
1536
                    do_not_decode[ch] = 1;
1537
                } else {
1538
                    do_not_decode[ch] = 0;
1539
                }
1540
                ++ch;
1541
                ++res_num;
1542
            }
1543
        }
1544
        residue = &vc->residues[mapping->submap_residue[i]];
1545
        vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);
1546

    
1547
        ch_res_ptr += ch * blocksize / 2;
1548
    }
1549

    
1550
// Inverse coupling
1551

    
1552
    for (i = mapping->coupling_steps - 1; i >= 0; --i) { //warning: i has to be signed
1553
        float *mag, *ang;
1554

    
1555
        mag = vc->channel_residues+res_chan[mapping->magnitude[i]] * blocksize / 2;
1556
        ang = vc->channel_residues+res_chan[mapping->angle[i]]     * blocksize / 2;
1557
        vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize / 2);
1558
    }
1559

    
1560
// Dotproduct, MDCT
1561

    
1562
    mdct = &vc->mdct[blockflag];
1563

    
1564
    for (j = vc->audio_channels-1;j >= 0; j--) {
1565
        ch_floor_ptr = vc->channel_floors   + j           * blocksize / 2;
1566
        ch_res_ptr   = vc->channel_residues + res_chan[j] * blocksize / 2;
1567
        vc->dsp.vector_fmul(ch_floor_ptr, ch_floor_ptr, ch_res_ptr, blocksize / 2);
1568
        mdct->imdct_half(mdct, ch_res_ptr, ch_floor_ptr);
1569
    }
1570

    
1571
// Overlap/add, save data for next overlapping  FPMATH
1572

    
1573
    retlen = (blocksize + vc->blocksize[previous_window]) / 4;
1574
    for (j = 0; j < vc->audio_channels; j++) {
1575
        uint_fast16_t bs0 = vc->blocksize[0];
1576
        uint_fast16_t bs1 = vc->blocksize[1];
1577
        float *residue    = vc->channel_residues + res_chan[j] * blocksize / 2;
1578
        float *saved      = vc->saved + j * bs1 / 4;
1579
        float *ret        = vc->channel_floors + j * retlen;
1580
        float *buf        = residue;
1581
        const float *win  = vc->win[blockflag & previous_window];
1582

    
1583
        if (blockflag == previous_window) {
1584
            vc->dsp.vector_fmul_window(ret, saved, buf, win, blocksize / 4);
1585
        } else if (blockflag > previous_window) {
1586
            vc->dsp.vector_fmul_window(ret, saved, buf, win, bs0 / 4);
1587
            memcpy(ret+bs0/2, buf+bs0/4, ((bs1-bs0)/4) * sizeof(float));
1588
        } else {
1589
            memcpy(ret, saved, ((bs1 - bs0) / 4) * sizeof(float));
1590
            vc->dsp.vector_fmul_window(ret + (bs1 - bs0) / 4, saved + (bs1 - bs0) / 4, buf, win, bs0 / 4);
1591
        }
1592
        memcpy(saved, buf + blocksize / 4, blocksize / 4 * sizeof(float));
1593
    }
1594

    
1595
    vc->previous_window = blockflag;
1596
    return retlen;
1597
}
1598

    
1599
// Return the decoded audio packet through the standard api
1600

    
1601
static int vorbis_decode_frame(AVCodecContext *avccontext,
1602
                               void *data, int *data_size,
1603
                               AVPacket *avpkt)
1604
{
1605
    const uint8_t *buf = avpkt->data;
1606
    int buf_size       = avpkt->size;
1607
    vorbis_context *vc = avccontext->priv_data ;
1608
    GetBitContext *gb = &(vc->gb);
1609
    const float *channel_ptrs[255];
1610
    int i;
1611

    
1612
    int_fast16_t len;
1613

    
1614
    if (!buf_size)
1615
        return 0;
1616

    
1617
    AV_DEBUG("packet length %d \n", buf_size);
1618

    
1619
    init_get_bits(gb, buf, buf_size*8);
1620

    
1621
    len = vorbis_parse_audio_packet(vc);
1622

    
1623
    if (len <= 0) {
1624
        *data_size = 0;
1625
        return buf_size;
1626
    }
1627

    
1628
    if (!vc->first_frame) {
1629
        vc->first_frame = 1;
1630
        *data_size = 0;
1631
        return buf_size ;
1632
    }
1633

    
1634
    AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);
1635

    
1636
    if (vc->audio_channels > 8) {
1637
        for (i = 0; i < vc->audio_channels; i++)
1638
            channel_ptrs[i] = vc->channel_floors + i * len;
1639
    } else {
1640
        for (i = 0; i < vc->audio_channels; i++)
1641
            channel_ptrs[i] = vc->channel_floors +
1642
                              len * ff_vorbis_channel_layout_offsets[vc->audio_channels - 1][i];
1643
    }
1644

    
1645
    vc->fmt_conv.float_to_int16_interleave(data, channel_ptrs, len,
1646
                                           vc->audio_channels);
1647
    *data_size = len * 2 * vc->audio_channels;
1648

    
1649
    return buf_size ;
1650
}
1651

    
1652
// Close decoder
1653

    
1654
static av_cold int vorbis_decode_close(AVCodecContext *avccontext)
1655
{
1656
    vorbis_context *vc = avccontext->priv_data;
1657

    
1658
    vorbis_free(vc);
1659

    
1660
    return 0 ;
1661
}
1662

    
1663
AVCodec ff_vorbis_decoder = {
1664
    "vorbis",
1665
    AVMEDIA_TYPE_AUDIO,
1666
    CODEC_ID_VORBIS,
1667
    sizeof(vorbis_context),
1668
    vorbis_decode_init,
1669
    NULL,
1670
    vorbis_decode_close,
1671
    vorbis_decode_frame,
1672
    .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),
1673
    .channel_layouts = ff_vorbis_channel_layouts,
1674
};
1675