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ffmpeg / libavcodec / vorbis_dec.c @ f640478b

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1
/**
2
 * @file libavcodec/vorbis_dec.c
3
 * Vorbis I decoder
4
 * @author Denes Balatoni  ( dbalatoni programozo hu )
5
 *
6
 * This file is part of FFmpeg.
7
 *
8
 * FFmpeg is free software; you can redistribute it and/or
9
 * modify it under the terms of the GNU Lesser General Public
10
 * License as published by the Free Software Foundation; either
11
 * version 2.1 of the License, or (at your option) any later version.
12
 *
13
 * FFmpeg is distributed in the hope that it will be useful,
14
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16
 * Lesser General Public License for more details.
17
 *
18
 * You should have received a copy of the GNU Lesser General Public
19
 * License along with FFmpeg; if not, write to the Free Software
20
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21
 */
22

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

    
27
#include <math.h>
28

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

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

    
37
#define V_NB_BITS 8
38
#define V_NB_BITS2 11
39
#define V_MAX_VLCS (1 << 16)
40
#define V_MAX_PARTITIONS (1 << 20)
41

    
42
#ifndef V_DEBUG
43
#define AV_DEBUG(...)
44
#endif
45

    
46
#undef NDEBUG
47
#include <assert.h>
48

    
49
typedef struct {
50
    uint_fast8_t dimensions;
51
    uint_fast8_t lookup_type;
52
    uint_fast8_t maxdepth;
53
    VLC vlc;
54
    float *codevectors;
55
    unsigned int nb_bits;
56
} vorbis_codebook;
57

    
58
typedef union  vorbis_floor_u  vorbis_floor_data;
59
typedef struct vorbis_floor0_s vorbis_floor0;
60
typedef struct vorbis_floor1_s vorbis_floor1;
61
struct vorbis_context_s;
62
typedef
63
uint_fast8_t (* vorbis_floor_decode_func)
64
             (struct vorbis_context_s *, vorbis_floor_data *, float *);
65
typedef struct {
66
    uint_fast8_t floor_type;
67
    vorbis_floor_decode_func decode;
68
    union vorbis_floor_u {
69
        struct vorbis_floor0_s {
70
            uint_fast8_t  order;
71
            uint_fast16_t rate;
72
            uint_fast16_t bark_map_size;
73
            int_fast32_t *map[2];
74
            uint_fast32_t map_size[2];
75
            uint_fast8_t  amplitude_bits;
76
            uint_fast8_t  amplitude_offset;
77
            uint_fast8_t  num_books;
78
            uint_fast8_t *book_list;
79
            float        *lsp;
80
        } t0;
81
        struct vorbis_floor1_s {
82
            uint_fast8_t partitions;
83
            uint_fast8_t maximum_class;
84
            uint_fast8_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
    uint_fast32_t 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
} vorbis_residue;
106

    
107
typedef struct {
108
    uint_fast8_t  submaps;
109
    uint_fast16_t coupling_steps;
110
    uint_fast8_t *magnitude;
111
    uint_fast8_t *angle;
112
    uint_fast8_t *mux;
113
    uint_fast8_t  submap_floor[16];
114
    uint_fast8_t  submap_residue[16];
115
} vorbis_mapping;
116

    
117
typedef struct {
118
    uint_fast8_t  blockflag;
119
    uint_fast16_t windowtype;
120
    uint_fast16_t transformtype;
121
    uint_fast8_t  mapping;
122
} vorbis_mode;
123

    
124
typedef struct vorbis_context_s {
125
    AVCodecContext *avccontext;
126
    GetBitContext gb;
127
    DSPContext dsp;
128

    
129
    FFTContext mdct[2];
130
    uint_fast8_t  first_frame;
131
    uint_fast32_t version;
132
    uint_fast8_t  audio_channels;
133
    uint_fast32_t audio_samplerate;
134
    uint_fast32_t bitrate_maximum;
135
    uint_fast32_t bitrate_nominal;
136
    uint_fast32_t bitrate_minimum;
137
    uint_fast32_t blocksize[2];
138
    const float  *win[2];
139
    uint_fast16_t codebook_count;
140
    vorbis_codebook *codebooks;
141
    uint_fast8_t  floor_count;
142
    vorbis_floor *floors;
143
    uint_fast8_t  residue_count;
144
    vorbis_residue *residues;
145
    uint_fast8_t  mapping_count;
146
    vorbis_mapping *mappings;
147
    uint_fast8_t  mode_count;
148
    vorbis_mode  *modes;
149
    uint_fast8_t  mode_number; // mode number for the current packet
150
    uint_fast8_t  previous_window;
151
    float        *channel_residues;
152
    float        *channel_floors;
153
    float        *saved;
154
    uint_fast32_t add_bias; // for float->int conversion
155
    uint_fast32_t exp_bias;
156
} vorbis_context;
157

    
158
/* Helper functions */
159

    
160
#define BARK(x) \
161
    (13.1f * atan(0.00074f * (x)) + 2.24f * atan(1.85e-8f * (x) * (x)) + 1e-4f * (x))
162

    
163
static float vorbisfloat2float(uint_fast32_t val)
164
{
165
    double mant = val & 0x1fffff;
166
    long exp    = (val & 0x7fe00000L) >> 21;
167
    if (val & 0x80000000)
168
        mant = -mant;
169
    return ldexp(mant, exp - 20 - 768);
170
}
171

    
172

    
173
// Free all allocated memory -----------------------------------------
174

    
175
static void vorbis_free(vorbis_context *vc)
176
{
177
    int_fast16_t i;
178

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

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

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

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

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

    
207
    for (i = 0; i < vc->mapping_count; ++i) {
208
        av_free(vc->mappings[i].magnitude);
209
        av_free(vc->mappings[i].angle);
210
        av_free(vc->mappings[i].mux);
211
    }
212
    av_freep(&vc->mappings);
213
}
214

    
215
// Parse setup header -------------------------------------------------
216

    
217
// Process codebooks part
218

    
219
static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc)
220
{
221
    uint_fast16_t cb;
222
    uint8_t  *tmp_vlc_bits;
223
    uint32_t *tmp_vlc_codes;
224
    GetBitContext *gb = &vc->gb;
225

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

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

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

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

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

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

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

    
258
        ordered = get_bits1(gb);
259

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

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

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

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

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

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

    
292
            AV_DEBUG(" ordered, current length: %d \n", current_length);  //FIXME
293

    
294
            used_entries = entries;
295
            for (; current_entry < used_entries && current_length <= 32; ++current_length) {
296
                uint_fast16_t i, number;
297

    
298
                AV_DEBUG(" number bits: %d ", ilog(entries - current_entry));
299

    
300
                number = get_bits(gb, ilog(entries - current_entry));
301

    
302
                AV_DEBUG(" number: %d \n", number);
303

    
304
                for (i = current_entry; i < number+current_entry; ++i)
305
                    if (i < used_entries)
306
                        tmp_vlc_bits[i] = current_length;
307

    
308
                current_entry+=number;
309
            }
310
            if (current_entry>used_entries) {
311
                av_log(vc->avccontext, AV_LOG_ERROR, " More codelengths than codes in codebook. \n");
312
                goto error;
313
            }
314
        }
315

    
316
        codebook_setup->lookup_type = get_bits(gb, 4);
317

    
318
        AV_DEBUG(" lookup type: %d : %s \n", codebook_setup->lookup_type, codebook_setup->lookup_type ? "vq" : "no lookup");
319

    
320
// If the codebook is used for (inverse) VQ, calculate codevectors.
321

    
322
        if (codebook_setup->lookup_type == 1) {
323
            uint_fast16_t i, j, k;
324
            uint_fast16_t codebook_lookup_values = ff_vorbis_nth_root(entries, codebook_setup->dimensions);
325
            uint_fast16_t codebook_multiplicands[codebook_lookup_values];
326

    
327
            float codebook_minimum_value = vorbisfloat2float(get_bits_long(gb, 32));
328
            float codebook_delta_value   = vorbisfloat2float(get_bits_long(gb, 32));
329
            uint_fast8_t codebook_value_bits = get_bits(gb, 4)+1;
330
            uint_fast8_t codebook_sequence_p = get_bits1(gb);
331

    
332
            AV_DEBUG(" We expect %d numbers for building the codevectors. \n", codebook_lookup_values);
333
            AV_DEBUG("  delta %f minmum %f \n", codebook_delta_value, codebook_minimum_value);
334

    
335
            for (i = 0; i < codebook_lookup_values; ++i) {
336
                codebook_multiplicands[i] = get_bits(gb, codebook_value_bits);
337

    
338
                AV_DEBUG(" multiplicands*delta+minmum : %e \n", (float)codebook_multiplicands[i]*codebook_delta_value+codebook_minimum_value);
339
                AV_DEBUG(" multiplicand %d \n", codebook_multiplicands[i]);
340
            }
341

    
342
// Weed out unused vlcs and build codevector vector
343
            codebook_setup->codevectors = used_entries ? av_mallocz(used_entries*codebook_setup->dimensions * sizeof(float)) : NULL;
344
            for (j = 0, i = 0; i < entries; ++i) {
345
                uint_fast8_t dim = codebook_setup->dimensions;
346

    
347
                if (tmp_vlc_bits[i]) {
348
                    float last = 0.0;
349
                    uint_fast32_t lookup_offset = i;
350

    
351
#ifdef V_DEBUG
352
                    av_log(vc->avccontext, AV_LOG_INFO, "Lookup offset %d ,", i);
353
#endif
354

    
355
                    for (k = 0; k < dim; ++k) {
356
                        uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values;
357
                        codebook_setup->codevectors[j * dim + k] = codebook_multiplicands[multiplicand_offset] * codebook_delta_value + codebook_minimum_value + last;
358
                        if (codebook_sequence_p)
359
                            last = codebook_setup->codevectors[j * dim + k];
360
                        lookup_offset/=codebook_lookup_values;
361
                    }
362
                    tmp_vlc_bits[j] = tmp_vlc_bits[i];
363

    
364
#ifdef V_DEBUG
365
                    av_log(vc->avccontext, AV_LOG_INFO, "real lookup offset %d, vector: ", j);
366
                    for (k = 0; k < dim; ++k)
367
                        av_log(vc->avccontext, AV_LOG_INFO, " %f ", codebook_setup->codevectors[j * dim + k]);
368
                    av_log(vc->avccontext, AV_LOG_INFO, "\n");
369
#endif
370

    
371
                    ++j;
372
                }
373
            }
374
            if (j != used_entries) {
375
                av_log(vc->avccontext, AV_LOG_ERROR, "Bug in codevector vector building code. \n");
376
                goto error;
377
            }
378
            entries = used_entries;
379
        } else if (codebook_setup->lookup_type >= 2) {
380
            av_log(vc->avccontext, AV_LOG_ERROR, "Codebook lookup type not supported. \n");
381
            goto error;
382
        }
383

    
384
// Initialize VLC table
385
        if (ff_vorbis_len2vlc(tmp_vlc_bits, tmp_vlc_codes, entries)) {
386
            av_log(vc->avccontext, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");
387
            goto error;
388
        }
389
        codebook_setup->maxdepth = 0;
390
        for (t = 0; t < entries; ++t)
391
            if (tmp_vlc_bits[t] >= codebook_setup->maxdepth)
392
                codebook_setup->maxdepth = tmp_vlc_bits[t];
393

    
394
        if (codebook_setup->maxdepth > 3 * V_NB_BITS)
395
            codebook_setup->nb_bits = V_NB_BITS2;
396
        else
397
            codebook_setup->nb_bits = V_NB_BITS;
398

    
399
        codebook_setup->maxdepth = (codebook_setup->maxdepth+codebook_setup->nb_bits - 1) / codebook_setup->nb_bits;
400

    
401
        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)) {
402
            av_log(vc->avccontext, AV_LOG_ERROR, " Error generating vlc tables. \n");
403
            goto error;
404
        }
405
    }
406

    
407
    av_free(tmp_vlc_bits);
408
    av_free(tmp_vlc_codes);
409
    return 0;
410

    
411
// Error:
412
error:
413
    av_free(tmp_vlc_bits);
414
    av_free(tmp_vlc_codes);
415
    return -1;
416
}
417

    
418
// Process time domain transforms part (unused in Vorbis I)
419

    
420
static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc)
421
{
422
    GetBitContext *gb = &vc->gb;
423
    uint_fast8_t i;
424
    uint_fast8_t vorbis_time_count = get_bits(gb, 6) + 1;
425

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

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

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

    
439
// Process floors part
440

    
441
static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,
442
                                         vorbis_floor_data *vfu, float *vec);
443
static void create_map(vorbis_context *vc, uint_fast8_t floor_number);
444
static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc,
445
                                         vorbis_floor_data *vfu, float *vec);
446
static int vorbis_parse_setup_hdr_floors(vorbis_context *vc)
447
{
448
    GetBitContext *gb = &vc->gb;
449
    uint_fast16_t i,j,k;
450

    
451
    vc->floor_count = get_bits(gb, 6) + 1;
452

    
453
    vc->floors = av_mallocz(vc->floor_count * sizeof(vorbis_floor));
454

    
455
    for (i = 0; i < vc->floor_count; ++i) {
456
        vorbis_floor *floor_setup = &vc->floors[i];
457

    
458
        floor_setup->floor_type = get_bits(gb, 16);
459

    
460
        AV_DEBUG(" %d. floor type %d \n", i, floor_setup->floor_type);
461

    
462
        if (floor_setup->floor_type == 1) {
463
            uint_fast8_t  maximum_class = 0;
464
            uint_fast8_t  rangebits;
465
            uint_fast16_t floor1_values = 2;
466

    
467
            floor_setup->decode = vorbis_floor1_decode;
468

    
469
            floor_setup->data.t1.partitions = get_bits(gb, 5);
470

    
471
            AV_DEBUG(" %d.floor: %d partitions \n", i, floor_setup->data.t1.partitions);
472

    
473
            for (j = 0; j < floor_setup->data.t1.partitions; ++j) {
474
                floor_setup->data.t1.partition_class[j] = get_bits(gb, 4);
475
                if (floor_setup->data.t1.partition_class[j] > maximum_class)
476
                    maximum_class = floor_setup->data.t1.partition_class[j];
477

    
478
                AV_DEBUG(" %d. floor %d partition class %d \n", i, j, floor_setup->data.t1.partition_class[j]);
479

    
480
            }
481

    
482
            AV_DEBUG(" maximum class %d \n", maximum_class);
483

    
484
            floor_setup->data.t1.maximum_class = maximum_class;
485

    
486
            for (j = 0; j <= maximum_class; ++j) {
487
                floor_setup->data.t1.class_dimensions[j] = get_bits(gb, 3) + 1;
488
                floor_setup->data.t1.class_subclasses[j] = get_bits(gb, 2);
489

    
490
                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]);
491

    
492
                if (floor_setup->data.t1.class_subclasses[j]) {
493
                    int bits = get_bits(gb, 8);
494
                    if (bits >= vc->codebook_count) {
495
                        av_log(vc->avccontext, AV_LOG_ERROR, "Masterbook index %d is out of range.\n", bits);
496
                        return -1;
497
                    }
498
                    floor_setup->data.t1.class_masterbook[j] = bits;
499

    
500
                    AV_DEBUG("   masterbook: %d \n", floor_setup->data.t1.class_masterbook[j]);
501
                }
502

    
503
                for (k = 0; k < (1 << floor_setup->data.t1.class_subclasses[j]); ++k) {
504
                    int16_t bits = get_bits(gb, 8) - 1;
505
                    if (bits != -1 && bits >= vc->codebook_count) {
506
                        av_log(vc->avccontext, AV_LOG_ERROR, "Subclass book index %d is out of range.\n", bits);
507
                        return -1;
508
                    }
509
                    floor_setup->data.t1.subclass_books[j][k] = bits;
510

    
511
                    AV_DEBUG("    book %d. : %d \n", k, floor_setup->data.t1.subclass_books[j][k]);
512
                }
513
            }
514

    
515
            floor_setup->data.t1.multiplier = get_bits(gb, 2) + 1;
516
            floor_setup->data.t1.x_list_dim = 2;
517

    
518
            for (j = 0; j < floor_setup->data.t1.partitions; ++j)
519
                floor_setup->data.t1.x_list_dim+=floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];
520

    
521
            floor_setup->data.t1.list = av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(vorbis_floor1_entry));
522

    
523

    
524
            rangebits = get_bits(gb, 4);
525
            floor_setup->data.t1.list[0].x = 0;
526
            floor_setup->data.t1.list[1].x = (1 << rangebits);
527

    
528
            for (j = 0; j < floor_setup->data.t1.partitions; ++j) {
529
                for (k = 0; k < floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]]; ++k, ++floor1_values) {
530
                    floor_setup->data.t1.list[floor1_values].x = get_bits(gb, rangebits);
531

    
532
                    AV_DEBUG(" %d. floor1 Y coord. %d \n", floor1_values, floor_setup->data.t1.list[floor1_values].x);
533
                }
534
            }
535

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

    
541
            floor_setup->decode = vorbis_floor0_decode;
542

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

    
557
            /* allocate mem for booklist */
558
            floor_setup->data.t0.book_list =
559
                av_malloc(floor_setup->data.t0.num_books);
560
            if (!floor_setup->data.t0.book_list)
561
                return -1;
562
            /* read book indexes */
563
            {
564
                int idx;
565
                uint_fast8_t book_idx;
566
                for (idx = 0; idx < floor_setup->data.t0.num_books; ++idx) {
567
                    book_idx = get_bits(gb, 8);
568
                    if (book_idx >= vc->codebook_count)
569
                        return -1;
570
                    floor_setup->data.t0.book_list[idx] = book_idx;
571
                    if (vc->codebooks[book_idx].dimensions > max_codebook_dim)
572
                        max_codebook_dim = vc->codebooks[book_idx].dimensions;
573
                }
574
            }
575

    
576
            create_map(vc, i);
577

    
578
            /* allocate mem for lsp coefficients */
579
            {
580
                /* codebook dim is for padding if codebook dim doesn't *
581
                 * divide order+1 then we need to read more data       */
582
                floor_setup->data.t0.lsp =
583
                    av_malloc((floor_setup->data.t0.order+1 + max_codebook_dim)
584
                              * sizeof(float));
585
                if (!floor_setup->data.t0.lsp)
586
                    return -1;
587
            }
588

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

    
619
// Process residues part
620

    
621
static int vorbis_parse_setup_hdr_residues(vorbis_context *vc)
622
{
623
    GetBitContext *gb = &vc->gb;
624
    uint_fast8_t i, j, k;
625

    
626
    vc->residue_count = get_bits(gb, 6)+1;
627
    vc->residues      = av_mallocz(vc->residue_count * sizeof(vorbis_residue));
628

    
629
    AV_DEBUG(" There are %d residues. \n", vc->residue_count);
630

    
631
    for (i = 0; i < vc->residue_count; ++i) {
632
        vorbis_residue *res_setup = &vc->residues[i];
633
        uint_fast8_t cascade[64];
634
        uint_fast8_t high_bits;
635
        uint_fast8_t low_bits;
636

    
637
        res_setup->type = get_bits(gb, 16);
638

    
639
        AV_DEBUG(" %d. residue type %d \n", i, res_setup->type);
640

    
641
        res_setup->begin          = get_bits(gb, 24);
642
        res_setup->end            = get_bits(gb, 24);
643
        res_setup->partition_size = get_bits(gb, 24) + 1;
644
        /* Validations to prevent a buffer overflow later. */
645
        if (res_setup->begin>res_setup->end ||
646
            res_setup->end>vc->blocksize[1] / (res_setup->type == 2 ? 1 : 2) ||
647
            (res_setup->end-res_setup->begin) / res_setup->partition_size > V_MAX_PARTITIONS) {
648
            av_log(vc->avccontext, AV_LOG_ERROR, "partition out of bounds: type, begin, end, size, blocksize: %"PRIdFAST16", %"PRIdFAST32", %"PRIdFAST32", %"PRIdFAST32", %"PRIdFAST32"\n", res_setup->type, res_setup->begin, res_setup->end, res_setup->partition_size, vc->blocksize[1] / 2);
649
            return -1;
650
        }
651

    
652
        res_setup->classifications = get_bits(gb, 6) + 1;
653
        res_setup->classbook = get_bits(gb, 8);
654
        if (res_setup->classbook >= vc->codebook_count) {
655
            av_log(vc->avccontext, AV_LOG_ERROR, "classbook value %d out of range. \n", res_setup->classbook);
656
            return -1;
657
        }
658

    
659
        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,
660
          res_setup->classifications, res_setup->classbook);
661

    
662
        for (j = 0; j < res_setup->classifications; ++j) {
663
            high_bits = 0;
664
            low_bits  = get_bits(gb, 3);
665
            if (get_bits1(gb))
666
                high_bits = get_bits(gb, 5);
667
            cascade[j] = (high_bits << 3) + low_bits;
668

    
669
            AV_DEBUG("     %d class casscade depth: %d \n", j, ilog(cascade[j]));
670
        }
671

    
672
        res_setup->maxpass = 0;
673
        for (j = 0; j < res_setup->classifications; ++j) {
674
            for (k = 0; k < 8; ++k) {
675
                if (cascade[j]&(1 << k)) {
676
                    int bits = get_bits(gb, 8);
677
                    if (bits >= vc->codebook_count) {
678
                        av_log(vc->avccontext, AV_LOG_ERROR, "book value %d out of range. \n", bits);
679
                        return -1;
680
                    }
681
                    res_setup->books[j][k] = bits;
682

    
683
                    AV_DEBUG("     %d class casscade depth %d book: %d \n", j, k, res_setup->books[j][k]);
684

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

    
696
// Process mappings part
697

    
698
static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc)
699
{
700
    GetBitContext *gb = &vc->gb;
701
    uint_fast8_t i, j;
702

    
703
    vc->mapping_count = get_bits(gb, 6)+1;
704
    vc->mappings      = av_mallocz(vc->mapping_count * sizeof(vorbis_mapping));
705

    
706
    AV_DEBUG(" There are %d mappings. \n", vc->mapping_count);
707

    
708
    for (i = 0; i < vc->mapping_count; ++i) {
709
        vorbis_mapping *mapping_setup = &vc->mappings[i];
710

    
711
        if (get_bits(gb, 16)) {
712
            av_log(vc->avccontext, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n");
713
            return -1;
714
        }
715
        if (get_bits1(gb)) {
716
            mapping_setup->submaps = get_bits(gb, 4) + 1;
717
        } else {
718
            mapping_setup->submaps = 1;
719
        }
720

    
721
        if (get_bits1(gb)) {
722
            mapping_setup->coupling_steps = get_bits(gb, 8) + 1;
723
            mapping_setup->magnitude      = av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
724
            mapping_setup->angle          = av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
725
            for (j = 0; j < mapping_setup->coupling_steps; ++j) {
726
                mapping_setup->magnitude[j] = get_bits(gb, ilog(vc->audio_channels - 1));
727
                mapping_setup->angle[j] = get_bits(gb, ilog(vc->audio_channels - 1));
728
                if (mapping_setup->magnitude[j] >= vc->audio_channels) {
729
                    av_log(vc->avccontext, AV_LOG_ERROR, "magnitude channel %d out of range. \n", mapping_setup->magnitude[j]);
730
                    return -1;
731
                }
732
                if (mapping_setup->angle[j] >= vc->audio_channels) {
733
                    av_log(vc->avccontext, AV_LOG_ERROR, "angle channel %d out of range. \n", mapping_setup->angle[j]);
734
                    return -1;
735
                }
736
            }
737
        } else {
738
            mapping_setup->coupling_steps = 0;
739
        }
740

    
741
        AV_DEBUG("   %d mapping coupling steps: %d \n", i, mapping_setup->coupling_steps);
742

    
743
        if (get_bits(gb, 2)) {
744
            av_log(vc->avccontext, AV_LOG_ERROR, "%d. mapping setup data invalid. \n", i);
745
            return -1; // following spec.
746
        }
747

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

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

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

    
776
// Process modes part
777

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

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

    
792
        map =  floors[floor_number].data.t0.map[blockflag];
793
        vf  = &floors[floor_number].data.t0;
794

    
795
        for (idx = 0; idx < n; ++idx) {
796
            map[idx] = floor(BARK((vf->rate * idx) / (2.0f * n)) *
797
                             ((vf->bark_map_size) /
798
                              BARK(vf->rate / 2.0f)));
799
            if (vf->bark_map_size-1 < map[idx])
800
                map[idx] = vf->bark_map_size - 1;
801
        }
802
        map[n] = -1;
803
        vf->map_size[blockflag] = n;
804
    }
805

    
806
#   ifdef V_DEBUG
807
    for (idx = 0; idx <= n; ++idx) {
808
        AV_DEBUG("floor0 map: map at pos %d is %d\n",
809
                 idx, map[idx]);
810
    }
811
#   endif
812
}
813

    
814
static int vorbis_parse_setup_hdr_modes(vorbis_context *vc)
815
{
816
    GetBitContext *gb = &vc->gb;
817
    uint_fast8_t i;
818

    
819
    vc->mode_count = get_bits(gb, 6) + 1;
820
    vc->modes      = av_mallocz(vc->mode_count * sizeof(vorbis_mode));
821

    
822
    AV_DEBUG(" There are %d modes.\n", vc->mode_count);
823

    
824
    for (i = 0; i < vc->mode_count; ++i) {
825
        vorbis_mode *mode_setup = &vc->modes[i];
826

    
827
        mode_setup->blockflag     = get_bits1(gb);
828
        mode_setup->windowtype    = get_bits(gb, 16); //FIXME check
829
        mode_setup->transformtype = get_bits(gb, 16); //FIXME check
830
        mode_setup->mapping       = get_bits(gb,  8);
831
        if (mode_setup->mapping >= vc->mapping_count) {
832
            av_log(vc->avccontext, AV_LOG_ERROR, "mode mapping value %d out of range. \n", mode_setup->mapping);
833
            return -1;
834
        }
835

    
836
        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);
837
    }
838
    return 0;
839
}
840

    
841
// Process the whole setup header using the functions above
842

    
843
static int vorbis_parse_setup_hdr(vorbis_context *vc)
844
{
845
    GetBitContext *gb = &vc->gb;
846

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

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

    
883
    return 0;
884
}
885

    
886
// Process the identification header
887

    
888
static int vorbis_parse_id_hdr(vorbis_context *vc)
889
{
890
    GetBitContext *gb = &vc->gb;
891
    uint_fast8_t bl0, bl1;
892

    
893
    if ((get_bits(gb, 8) != 'v') || (get_bits(gb, 8) != 'o') ||
894
        (get_bits(gb, 8) != 'r') || (get_bits(gb, 8) != 'b') ||
895
        (get_bits(gb, 8) != 'i') || (get_bits(gb, 8) != 's')) {
896
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n");
897
        return -1;
898
    }
899

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

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

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

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

    
944
    AV_DEBUG(" vorbis version %d \n audio_channels %d \n audio_samplerate %d \n bitrate_max %d \n bitrate_nom %d \n bitrate_min %d \n blk_0 %d blk_1 %d \n ",
945
            vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize[0], vc->blocksize[1]);
946

    
947
/*
948
    BLK = vc->blocksize[0];
949
    for (i = 0; i < BLK / 2; ++i) {
950
        vc->win[0][i] = sin(0.5*3.14159265358*(sin(((float)i + 0.5) / (float)BLK*3.14159265358))*(sin(((float)i + 0.5) / (float)BLK*3.14159265358)));
951
    }
952
*/
953

    
954
    return 0;
955
}
956

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

    
959
static av_cold int vorbis_decode_init(AVCodecContext *avccontext)
960
{
961
    vorbis_context *vc = avccontext->priv_data ;
962
    uint8_t *headers   = avccontext->extradata;
963
    int headers_len    = avccontext->extradata_size;
964
    uint8_t *header_start[3];
965
    int header_len[3];
966
    GetBitContext *gb = &(vc->gb);
967
    int hdr_type;
968

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

    
972
    if (vc->dsp.float_to_int16_interleave == ff_float_to_int16_interleave_c) {
973
        vc->add_bias = 385;
974
        vc->exp_bias = 0;
975
    } else {
976
        vc->add_bias = 0;
977
        vc->exp_bias = 15 << 23;
978
    }
979

    
980
    if (!headers_len) {
981
        av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
982
        return -1;
983
    }
984

    
985
    if (ff_split_xiph_headers(headers, headers_len, 30, header_start, header_len) < 0) {
986
        av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
987
        return -1;
988
    }
989

    
990
    init_get_bits(gb, header_start[0], header_len[0]*8);
991
    hdr_type = get_bits(gb, 8);
992
    if (hdr_type != 1) {
993
        av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n");
994
        return -1;
995
    }
996
    if (vorbis_parse_id_hdr(vc)) {
997
        av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n");
998
        vorbis_free(vc);
999
        return -1;
1000
    }
1001

    
1002
    init_get_bits(gb, header_start[2], header_len[2]*8);
1003
    hdr_type = get_bits(gb, 8);
1004
    if (hdr_type != 5) {
1005
        av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");
1006
        vorbis_free(vc);
1007
        return -1;
1008
    }
1009
    if (vorbis_parse_setup_hdr(vc)) {
1010
        av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");
1011
        vorbis_free(vc);
1012
        return -1;
1013
    }
1014

    
1015
    if (vc->audio_channels > 6)
1016
        avccontext->channel_layout = 0;
1017
    else
1018
        avccontext->channel_layout = ff_vorbis_channel_layouts[vc->audio_channels - 1];
1019

    
1020
    avccontext->channels    = vc->audio_channels;
1021
    avccontext->sample_rate = vc->audio_samplerate;
1022
    avccontext->frame_size  = FFMIN(vc->blocksize[0], vc->blocksize[1]) >> 2;
1023
    avccontext->sample_fmt  = SAMPLE_FMT_S16;
1024

    
1025
    return 0 ;
1026
}
1027

    
1028
// Decode audiopackets -------------------------------------------------
1029

    
1030
// Read and decode floor
1031

    
1032
static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,
1033
                                         vorbis_floor_data *vfu, float *vec)
1034
{
1035
    vorbis_floor0 *vf = &vfu->t0;
1036
    float *lsp = vf->lsp;
1037
    uint_fast32_t amplitude;
1038
    uint_fast32_t book_idx;
1039
    uint_fast8_t blockflag = vc->modes[vc->mode_number].blockflag;
1040

    
1041
    amplitude = get_bits(&vc->gb, vf->amplitude_bits);
1042
    if (amplitude > 0) {
1043
        float last = 0;
1044
        uint_fast16_t lsp_len = 0;
1045
        uint_fast16_t idx;
1046
        vorbis_codebook codebook;
1047

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

    
1058
        while (lsp_len<vf->order) {
1059
            int vec_off;
1060

    
1061
            AV_DEBUG("floor0 dec: book dimension: %d\n", codebook.dimensions);
1062
            AV_DEBUG("floor0 dec: maximum depth: %d\n", codebook.maxdepth);
1063
            /* read temp vector */
1064
            vec_off = get_vlc2(&vc->gb, codebook.vlc.table,
1065
                               codebook.nb_bits, codebook.maxdepth)
1066
                      * codebook.dimensions;
1067
            AV_DEBUG("floor0 dec: vector offset: %d\n", vec_off);
1068
            /* copy each vector component and add last to it */
1069
            for (idx = 0; idx < codebook.dimensions; ++idx)
1070
                lsp[lsp_len+idx] = codebook.codevectors[vec_off+idx] + last;
1071
            last = lsp[lsp_len+idx-1]; /* set last to last vector component */
1072

    
1073
            lsp_len += codebook.dimensions;
1074
        }
1075
#ifdef V_DEBUG
1076
        /* DEBUG: output lsp coeffs */
1077
        {
1078
            int idx;
1079
            for (idx = 0; idx < lsp_len; ++idx)
1080
                AV_DEBUG("floor0 dec: coeff at %d is %f\n", idx, lsp[idx]);
1081
        }
1082
#endif
1083

    
1084
        /* synthesize floor output vector */
1085
        {
1086
            int i;
1087
            int order = vf->order;
1088
            float wstep = M_PI / vf->bark_map_size;
1089

    
1090
            for (i = 0; i < order; i++)
1091
                lsp[i] = 2.0f * cos(lsp[i]);
1092

    
1093
            AV_DEBUG("floor0 synth: map_size = %d; m = %d; wstep = %f\n",
1094
                     vf->map_size, order, wstep);
1095

    
1096
            i = 0;
1097
            while (i < vf->map_size[blockflag]) {
1098
                int j, iter_cond = vf->map[blockflag][i];
1099
                float p = 0.5f;
1100
                float q = 0.5f;
1101
                float two_cos_w = 2.0f * cos(wstep * iter_cond); // needed all times
1102

    
1103
                /* similar part for the q and p products */
1104
                for (j = 0; j + 1 < order; j += 2) {
1105
                    q *= lsp[j]     - two_cos_w;
1106
                    p *= lsp[j + 1] - two_cos_w;
1107
                }
1108
                if (j == order) { // even order
1109
                    p *= p * (2.0f - two_cos_w);
1110
                    q *= q * (2.0f + two_cos_w);
1111
                } else { // odd order
1112
                    q *= two_cos_w-lsp[j]; // one more time for q
1113

    
1114
                    /* final step and square */
1115
                    p *= p * (4.f - two_cos_w * two_cos_w);
1116
                    q *= q;
1117
                }
1118

    
1119
                /* calculate linear floor value */
1120
                {
1121
                    q = exp((((amplitude*vf->amplitude_offset) /
1122
                              (((1 << vf->amplitude_bits) - 1) * sqrt(p + q)))
1123
                             - vf->amplitude_offset) * .11512925f);
1124
                }
1125

    
1126
                /* fill vector */
1127
                do {
1128
                    vec[i] = q; ++i;
1129
                } while (vf->map[blockflag][i] == iter_cond);
1130
            }
1131
        }
1132
    } else {
1133
        /* this channel is unused */
1134
        return 1;
1135
    }
1136

    
1137
    AV_DEBUG(" Floor0 decoded\n");
1138

    
1139
    return 0;
1140
}
1141

    
1142
static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc,
1143
                                         vorbis_floor_data *vfu, float *vec)
1144
{
1145
    vorbis_floor1 *vf = &vfu->t1;
1146
    GetBitContext *gb = &vc->gb;
1147
    uint_fast16_t range_v[4] = { 256, 128, 86, 64 };
1148
    uint_fast16_t range = range_v[vf->multiplier-1];
1149
    uint_fast16_t floor1_Y[vf->x_list_dim];
1150
    uint_fast16_t floor1_Y_final[vf->x_list_dim];
1151
    int floor1_flag[vf->x_list_dim];
1152
    uint_fast8_t class_;
1153
    uint_fast8_t cdim;
1154
    uint_fast8_t cbits;
1155
    uint_fast8_t csub;
1156
    uint_fast8_t cval;
1157
    int_fast16_t book;
1158
    uint_fast16_t offset;
1159
    uint_fast16_t i,j;
1160
    /*u*/int_fast16_t adx, ady, off, predicted; // WTF ? dy/adx =  (unsigned)dy/adx ?
1161
    int_fast16_t dy, err;
1162

    
1163

    
1164
    if (!get_bits1(gb)) // silence
1165
        return 1;
1166

    
1167
// Read values (or differences) for the floor's points
1168

    
1169
    floor1_Y[0] = get_bits(gb, ilog(range - 1));
1170
    floor1_Y[1] = get_bits(gb, ilog(range - 1));
1171

    
1172
    AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);
1173

    
1174
    offset = 2;
1175
    for (i = 0; i < vf->partitions; ++i) {
1176
        class_ = vf->partition_class[i];
1177
        cdim   = vf->class_dimensions[class_];
1178
        cbits  = vf->class_subclasses[class_];
1179
        csub = (1 << cbits) - 1;
1180
        cval = 0;
1181

    
1182
        AV_DEBUG("Cbits %d \n", cbits);
1183

    
1184
        if (cbits) // this reads all subclasses for this partition's class
1185
            cval = get_vlc2(gb, vc->codebooks[vf->class_masterbook[class_]].vlc.table,
1186
                            vc->codebooks[vf->class_masterbook[class_]].nb_bits, 3);
1187

    
1188
        for (j = 0; j < cdim; ++j) {
1189
            book = vf->subclass_books[class_][cval & csub];
1190

    
1191
            AV_DEBUG("book %d Cbits %d cval %d  bits:%d \n", book, cbits, cval, get_bits_count(gb));
1192

    
1193
            cval = cval >> cbits;
1194
            if (book > -1) {
1195
                floor1_Y[offset+j] = get_vlc2(gb, vc->codebooks[book].vlc.table,
1196
                vc->codebooks[book].nb_bits, 3);
1197
            } else {
1198
                floor1_Y[offset+j] = 0;
1199
            }
1200

    
1201
            AV_DEBUG(" floor(%d) = %d \n", vf->list[offset+j].x, floor1_Y[offset+j]);
1202
        }
1203
        offset+=cdim;
1204
    }
1205

    
1206
// Amplitude calculation from the differences
1207

    
1208
    floor1_flag[0] = 1;
1209
    floor1_flag[1] = 1;
1210
    floor1_Y_final[0] = floor1_Y[0];
1211
    floor1_Y_final[1] = floor1_Y[1];
1212

    
1213
    for (i = 2; i < vf->x_list_dim; ++i) {
1214
        uint_fast16_t val, highroom, lowroom, room;
1215
        uint_fast16_t high_neigh_offs;
1216
        uint_fast16_t low_neigh_offs;
1217

    
1218
        low_neigh_offs  = vf->list[i].low;
1219
        high_neigh_offs = vf->list[i].high;
1220
        dy  = floor1_Y_final[high_neigh_offs] - floor1_Y_final[low_neigh_offs];  // render_point begin
1221
        adx = vf->list[high_neigh_offs].x - vf->list[low_neigh_offs].x;
1222
        ady = FFABS(dy);
1223
        err = ady * (vf->list[i].x - vf->list[low_neigh_offs].x);
1224
        off = (int16_t)err / (int16_t)adx;
1225
        if (dy < 0) {
1226
            predicted = floor1_Y_final[low_neigh_offs] - off;
1227
        } else {
1228
            predicted = floor1_Y_final[low_neigh_offs] + off;
1229
        } // render_point end
1230

    
1231
        val = floor1_Y[i];
1232
        highroom = range-predicted;
1233
        lowroom  = predicted;
1234
        if (highroom < lowroom) {
1235
            room = highroom * 2;
1236
        } else {
1237
            room = lowroom * 2;   // SPEC mispelling
1238
        }
1239
        if (val) {
1240
            floor1_flag[low_neigh_offs]  = 1;
1241
            floor1_flag[high_neigh_offs] = 1;
1242
            floor1_flag[i]               = 1;
1243
            if (val >= room) {
1244
                if (highroom > lowroom) {
1245
                    floor1_Y_final[i] = val - lowroom + predicted;
1246
                } else {
1247
                    floor1_Y_final[i] = predicted - val + highroom - 1;
1248
                }
1249
            } else {
1250
                if (val & 1) {
1251
                    floor1_Y_final[i] = predicted - (val + 1) / 2;
1252
                } else {
1253
                    floor1_Y_final[i] = predicted + val / 2;
1254
                }
1255
            }
1256
        } else {
1257
            floor1_flag[i]    = 0;
1258
            floor1_Y_final[i] = predicted;
1259
        }
1260

    
1261
        AV_DEBUG(" Decoded floor(%d) = %d / val %d \n", vf->list[i].x, floor1_Y_final[i], val);
1262
    }
1263

    
1264
// Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?
1265

    
1266
    ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);
1267

    
1268
    AV_DEBUG(" Floor decoded\n");
1269

    
1270
    return 0;
1271
}
1272

    
1273
// Read and decode residue
1274

    
1275
static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc,
1276
                                                           vorbis_residue *vr,
1277
                                                           uint_fast8_t ch,
1278
                                                           uint_fast8_t *do_not_decode,
1279
                                                           float *vec,
1280
                                                           uint_fast16_t vlen,
1281
                                                           int vr_type)
1282
{
1283
    GetBitContext *gb = &vc->gb;
1284
    uint_fast8_t c_p_c = vc->codebooks[vr->classbook].dimensions;
1285
    uint_fast16_t n_to_read = vr->end-vr->begin;
1286
    uint_fast16_t ptns_to_read = n_to_read/vr->partition_size;
1287
    uint_fast8_t classifs[ptns_to_read*vc->audio_channels];
1288
    uint_fast8_t pass;
1289
    uint_fast8_t ch_used;
1290
    uint_fast8_t i,j,l;
1291
    uint_fast16_t k;
1292

    
1293
    if (vr_type == 2) {
1294
        for (j = 1; j < ch; ++j)
1295
            do_not_decode[0] &= do_not_decode[j];  // FIXME - clobbering input
1296
        if (do_not_decode[0])
1297
            return 0;
1298
        ch_used = 1;
1299
    } else {
1300
        ch_used = ch;
1301
    }
1302

    
1303
    AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);
1304

    
1305
    for (pass = 0; pass <= vr->maxpass; ++pass) { // FIXME OPTIMIZE?
1306
        uint_fast16_t voffset;
1307
        uint_fast16_t partition_count;
1308
        uint_fast16_t j_times_ptns_to_read;
1309

    
1310
        voffset = vr->begin;
1311
        for (partition_count = 0; partition_count < ptns_to_read;) {  // SPEC        error
1312
            if (!pass) {
1313
                uint_fast32_t inverse_class = ff_inverse[vr->classifications];
1314
                for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {
1315
                    if (!do_not_decode[j]) {
1316
                        uint_fast32_t temp = get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,
1317
                        vc->codebooks[vr->classbook].nb_bits, 3);
1318

    
1319
                        AV_DEBUG("Classword: %d \n", temp);
1320

    
1321
                        assert(vr->classifications > 1 && temp <= 65536); //needed for inverse[]
1322
                        for (i = 0; i < c_p_c; ++i) {
1323
                            uint_fast32_t temp2;
1324

    
1325
                            temp2 = (((uint_fast64_t)temp) * inverse_class) >> 32;
1326
                            if (partition_count + c_p_c - 1 - i < ptns_to_read)
1327
                                classifs[j_times_ptns_to_read + partition_count + c_p_c - 1 - i] = temp - temp2 * vr->classifications;
1328
                            temp = temp2;
1329
                        }
1330
                    }
1331
                    j_times_ptns_to_read += ptns_to_read;
1332
                }
1333
            }
1334
            for (i = 0; (i < c_p_c) && (partition_count < ptns_to_read); ++i) {
1335
                for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {
1336
                    uint_fast16_t voffs;
1337

    
1338
                    if (!do_not_decode[j]) {
1339
                        uint_fast8_t vqclass = classifs[j_times_ptns_to_read+partition_count];
1340
                        int_fast16_t vqbook = vr->books[vqclass][pass];
1341

    
1342
                        if (vqbook >= 0 && vc->codebooks[vqbook].codevectors) {
1343
                            uint_fast16_t coffs;
1344
                            unsigned dim =  vc->codebooks[vqbook].dimensions; // not uint_fast8_t: 64bit is slower here on amd64
1345
                            uint_fast16_t step = dim == 1 ? vr->partition_size
1346
                                                          : FASTDIV(vr->partition_size, dim);
1347
                            vorbis_codebook codebook = vc->codebooks[vqbook];
1348

    
1349
                            if (vr_type == 0) {
1350

    
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)
1355
                                        vec[voffs + k + l * step] += codebook.codevectors[coffs + l];  // FPMATH
1356
                                }
1357
                            } else if (vr_type == 1) {
1358
                                voffs = voffset + j * vlen;
1359
                                for (k = 0; k < step; ++k) {
1360
                                    coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1361
                                    for (l = 0; l < dim; ++l, ++voffs) {
1362
                                        vec[voffs]+=codebook.codevectors[coffs+l];  // FPMATH
1363

    
1364
                                        AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d  \n", pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);
1365
                                    }
1366
                                }
1367
                            } else if (vr_type == 2 && ch == 2 && (voffset & 1) == 0 && (dim & 1) == 0) { // most frequent case optimized
1368
                                voffs = voffset >> 1;
1369

    
1370
                                if (dim == 2) {
1371
                                    for (k = 0; k < step; ++k) {
1372
                                        coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;
1373
                                        vec[voffs + k       ] += codebook.codevectors[coffs    ];  // FPMATH
1374
                                        vec[voffs + k + vlen] += codebook.codevectors[coffs + 1];  // FPMATH
1375
                                    }
1376
                                } else if (dim == 4) {
1377
                                    for (k = 0; k < step; ++k, voffs += 2) {
1378
                                        coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4;
1379
                                        vec[voffs           ] += codebook.codevectors[coffs    ];  // FPMATH
1380
                                        vec[voffs + 1       ] += codebook.codevectors[coffs + 2];  // FPMATH
1381
                                        vec[voffs + vlen    ] += codebook.codevectors[coffs + 1];  // FPMATH
1382
                                        vec[voffs + vlen + 1] += codebook.codevectors[coffs + 3];  // FPMATH
1383
                                    }
1384
                                } else
1385
                                for (k = 0; k < step; ++k) {
1386
                                    coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1387
                                    for (l = 0; l < dim; l += 2, voffs++) {
1388
                                        vec[voffs       ] += codebook.codevectors[coffs + l    ];  // FPMATH
1389
                                        vec[voffs + vlen] += codebook.codevectors[coffs + l + 1];  // FPMATH
1390

    
1391
                                        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);
1392
                                    }
1393
                                }
1394

    
1395
                            } else if (vr_type == 2) {
1396
                                voffs = voffset;
1397

    
1398
                                for (k = 0; k < step; ++k) {
1399
                                    coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1400
                                    for (l = 0; l < dim; ++l, ++voffs) {
1401
                                        vec[voffs / ch + (voffs % ch) * vlen] += codebook.codevectors[coffs + l];  // FPMATH FIXME use if and counter instead of / and %
1402

    
1403
                                        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);
1404
                                    }
1405
                                }
1406
                            }
1407
                        }
1408
                    }
1409
                    j_times_ptns_to_read += ptns_to_read;
1410
                }
1411
                ++partition_count;
1412
                voffset += vr->partition_size;
1413
            }
1414
        }
1415
    }
1416
    return 0;
1417
}
1418

    
1419
static inline int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr,
1420
                                        uint_fast8_t ch,
1421
                                        uint_fast8_t *do_not_decode,
1422
                                        float *vec, uint_fast16_t vlen)
1423
{
1424
    if (vr->type == 2)
1425
        return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 2);
1426
    else if (vr->type == 1)
1427
        return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 1);
1428
    else if (vr->type == 0)
1429
        return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 0);
1430
    else {
1431
        av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");
1432
        return -1;
1433
    }
1434
}
1435

    
1436
void vorbis_inverse_coupling(float *mag, float *ang, int blocksize)
1437
{
1438
    int i;
1439
    for (i = 0;  i < blocksize;  i++) {
1440
        if (mag[i] > 0.0) {
1441
            if (ang[i] > 0.0) {
1442
                ang[i] = mag[i] - ang[i];
1443
            } else {
1444
                float temp = ang[i];
1445
                ang[i]     = mag[i];
1446
                mag[i]    += temp;
1447
            }
1448
        } else {
1449
            if (ang[i] > 0.0) {
1450
                ang[i] += mag[i];
1451
            } else {
1452
                float temp = ang[i];
1453
                ang[i]     = mag[i];
1454
                mag[i]    -= temp;
1455
            }
1456
        }
1457
    }
1458
}
1459

    
1460
static void copy_normalize(float *dst, float *src, int len, int exp_bias,
1461
                           float add_bias)
1462
{
1463
    int i;
1464
    if (exp_bias) {
1465
        memcpy(dst, src, len * sizeof(float));
1466
    } else {
1467
        for (i = 0; i < len; i++)
1468
            dst[i] = src[i] + add_bias;
1469
    }
1470
}
1471

    
1472
// Decode the audio packet using the functions above
1473

    
1474
static int vorbis_parse_audio_packet(vorbis_context *vc)
1475
{
1476
    GetBitContext *gb = &vc->gb;
1477

    
1478
    uint_fast8_t previous_window = vc->previous_window;
1479
    uint_fast8_t mode_number;
1480
    uint_fast8_t blockflag;
1481
    uint_fast16_t blocksize;
1482
    int_fast32_t i,j;
1483
    uint_fast8_t no_residue[vc->audio_channels];
1484
    uint_fast8_t do_not_decode[vc->audio_channels];
1485
    vorbis_mapping *mapping;
1486
    float *ch_res_ptr   = vc->channel_residues;
1487
    float *ch_floor_ptr = vc->channel_floors;
1488
    uint_fast8_t res_chan[vc->audio_channels];
1489
    uint_fast8_t res_num = 0;
1490
    int_fast16_t retlen  = 0;
1491
    float fadd_bias = vc->add_bias;
1492

    
1493
    if (get_bits1(gb)) {
1494
        av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");
1495
        return -1; // packet type not audio
1496
    }
1497

    
1498
    if (vc->mode_count == 1) {
1499
        mode_number = 0;
1500
    } else {
1501
        mode_number = get_bits(gb, ilog(vc->mode_count-1));
1502
    }
1503
    if (mode_number >= vc->mode_count) {
1504
        av_log(vc->avccontext, AV_LOG_ERROR, "mode number %d out of range.\n", mode_number);
1505
        return -1;
1506
    }
1507
    vc->mode_number = mode_number;
1508
    mapping = &vc->mappings[vc->modes[mode_number].mapping];
1509

    
1510
    AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);
1511

    
1512
    blockflag = vc->modes[mode_number].blockflag;
1513
    blocksize = vc->blocksize[blockflag];
1514
    if (blockflag)
1515
        skip_bits(gb, 2); // previous_window, next_window
1516

    
1517
    memset(ch_res_ptr,   0, sizeof(float) * vc->audio_channels * blocksize / 2); //FIXME can this be removed ?
1518
    memset(ch_floor_ptr, 0, sizeof(float) * vc->audio_channels * blocksize / 2); //FIXME can this be removed ?
1519

    
1520
// Decode floor
1521

    
1522
    for (i = 0; i < vc->audio_channels; ++i) {
1523
        vorbis_floor *floor;
1524
        if (mapping->submaps > 1) {
1525
            floor = &vc->floors[mapping->submap_floor[mapping->mux[i]]];
1526
        } else {
1527
            floor = &vc->floors[mapping->submap_floor[0]];
1528
        }
1529

    
1530
        no_residue[i] = floor->decode(vc, &floor->data, ch_floor_ptr);
1531
        ch_floor_ptr += blocksize / 2;
1532
    }
1533

    
1534
// Nonzero vector propagate
1535

    
1536
    for (i = mapping->coupling_steps - 1; i >= 0; --i) {
1537
        if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {
1538
            no_residue[mapping->magnitude[i]] = 0;
1539
            no_residue[mapping->angle[i]]     = 0;
1540
        }
1541
    }
1542

    
1543
// Decode residue
1544

    
1545
    for (i = 0; i < mapping->submaps; ++i) {
1546
        vorbis_residue *residue;
1547
        uint_fast8_t ch = 0;
1548

    
1549
        for (j = 0; j < vc->audio_channels; ++j) {
1550
            if ((mapping->submaps == 1) || (i == mapping->mux[j])) {
1551
                res_chan[j] = res_num;
1552
                if (no_residue[j]) {
1553
                    do_not_decode[ch] = 1;
1554
                } else {
1555
                    do_not_decode[ch] = 0;
1556
                }
1557
                ++ch;
1558
                ++res_num;
1559
            }
1560
        }
1561
        residue = &vc->residues[mapping->submap_residue[i]];
1562
        vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);
1563

    
1564
        ch_res_ptr += ch * blocksize / 2;
1565
    }
1566

    
1567
// Inverse coupling
1568

    
1569
    for (i = mapping->coupling_steps - 1; i >= 0; --i) { //warning: i has to be signed
1570
        float *mag, *ang;
1571

    
1572
        mag = vc->channel_residues+res_chan[mapping->magnitude[i]] * blocksize / 2;
1573
        ang = vc->channel_residues+res_chan[mapping->angle[i]]     * blocksize / 2;
1574
        vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize / 2);
1575
    }
1576

    
1577
// Dotproduct, MDCT
1578

    
1579
    for (j = vc->audio_channels-1;j >= 0; j--) {
1580
        ch_floor_ptr = vc->channel_floors   + j           * blocksize / 2;
1581
        ch_res_ptr   = vc->channel_residues + res_chan[j] * blocksize / 2;
1582
        vc->dsp.vector_fmul(ch_floor_ptr, ch_res_ptr, blocksize / 2);
1583
        ff_imdct_half(&vc->mdct[blockflag], ch_res_ptr, ch_floor_ptr);
1584
    }
1585

    
1586
// Overlap/add, save data for next overlapping  FPMATH
1587

    
1588
    retlen = (blocksize + vc->blocksize[previous_window]) / 4;
1589
    for (j = 0; j < vc->audio_channels; j++) {
1590
        uint_fast16_t bs0 = vc->blocksize[0];
1591
        uint_fast16_t bs1 = vc->blocksize[1];
1592
        float *residue    = vc->channel_residues + res_chan[j] * blocksize / 2;
1593
        float *saved      = vc->saved + j * bs1 / 4;
1594
        float *ret        = vc->channel_floors + j * retlen;
1595
        float *buf        = residue;
1596
        const float *win  = vc->win[blockflag & previous_window];
1597

    
1598
        if (blockflag == previous_window) {
1599
            vc->dsp.vector_fmul_window(ret, saved, buf, win, fadd_bias, blocksize / 4);
1600
        } else if (blockflag > previous_window) {
1601
            vc->dsp.vector_fmul_window(ret, saved, buf, win, fadd_bias, bs0 / 4);
1602
            copy_normalize(ret+bs0/2, buf+bs0/4, (bs1-bs0)/4, vc->exp_bias, fadd_bias);
1603
        } else {
1604
            copy_normalize(ret, saved, (bs1 - bs0) / 4, vc->exp_bias, fadd_bias);
1605
            vc->dsp.vector_fmul_window(ret + (bs1 - bs0) / 4, saved + (bs1 - bs0) / 4, buf, win, fadd_bias, bs0 / 4);
1606
        }
1607
        memcpy(saved, buf + blocksize / 4, blocksize / 4 * sizeof(float));
1608
    }
1609

    
1610
    vc->previous_window = blockflag;
1611
    return retlen;
1612
}
1613

    
1614
// Return the decoded audio packet through the standard api
1615

    
1616
static int vorbis_decode_frame(AVCodecContext *avccontext,
1617
                               void *data, int *data_size,
1618
                               AVPacket *avpkt)
1619
{
1620
    const uint8_t *buf = avpkt->data;
1621
    int buf_size       = avpkt->size;
1622
    vorbis_context *vc = avccontext->priv_data ;
1623
    GetBitContext *gb = &(vc->gb);
1624
    const float *channel_ptrs[vc->audio_channels];
1625
    int i;
1626

    
1627
    int_fast16_t len;
1628

    
1629
    if (!buf_size)
1630
        return 0;
1631

    
1632
    AV_DEBUG("packet length %d \n", buf_size);
1633

    
1634
    init_get_bits(gb, buf, buf_size*8);
1635

    
1636
    len = vorbis_parse_audio_packet(vc);
1637

    
1638
    if (len <= 0) {
1639
        *data_size = 0;
1640
        return buf_size;
1641
    }
1642

    
1643
    if (!vc->first_frame) {
1644
        vc->first_frame = 1;
1645
        *data_size = 0;
1646
        return buf_size ;
1647
    }
1648

    
1649
    AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);
1650

    
1651
    if (vc->audio_channels > 6) {
1652
        for (i = 0; i < vc->audio_channels; i++)
1653
            channel_ptrs[i] = vc->channel_floors + i * len;
1654
    } else {
1655
        for (i = 0; i < vc->audio_channels; i++)
1656
            channel_ptrs[i] = vc->channel_floors +
1657
                              len * ff_vorbis_channel_layout_offsets[vc->audio_channels - 1][i];
1658
    }
1659

    
1660
    vc->dsp.float_to_int16_interleave(data, channel_ptrs, len, vc->audio_channels);
1661
    *data_size = len * 2 * vc->audio_channels;
1662

    
1663
    return buf_size ;
1664
}
1665

    
1666
// Close decoder
1667

    
1668
static av_cold int vorbis_decode_close(AVCodecContext *avccontext)
1669
{
1670
    vorbis_context *vc = avccontext->priv_data;
1671

    
1672
    vorbis_free(vc);
1673

    
1674
    return 0 ;
1675
}
1676

    
1677
AVCodec vorbis_decoder = {
1678
    "vorbis",
1679
    CODEC_TYPE_AUDIO,
1680
    CODEC_ID_VORBIS,
1681
    sizeof(vorbis_context),
1682
    vorbis_decode_init,
1683
    NULL,
1684
    vorbis_decode_close,
1685
    vorbis_decode_frame,
1686
    .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),
1687
    .channel_layouts = ff_vorbis_channel_layouts,
1688
};
1689