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ffmpeg / libavcodec / vorbis_dec.c @ 72415b2a

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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
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 * Lesser General Public License for more details.
17
 *
18
 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
20
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21
 */
22

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

    
27
#include <math.h>
28

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

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

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

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

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

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

    
59
typedef union  vorbis_floor_u  vorbis_floor_data;
60
typedef struct vorbis_floor0_s vorbis_floor0;
61
typedef struct vorbis_floor1_s vorbis_floor1;
62
struct vorbis_context_s;
63
typedef
64
uint_fast8_t (* vorbis_floor_decode_func)
65
             (struct vorbis_context_s *, vorbis_floor_data *, float *);
66
typedef struct {
67
    uint_fast8_t floor_type;
68
    vorbis_floor_decode_func decode;
69
    union vorbis_floor_u {
70
        struct vorbis_floor0_s {
71
            uint_fast8_t  order;
72
            uint_fast16_t rate;
73
            uint_fast16_t bark_map_size;
74
            int_fast32_t *map[2];
75
            uint_fast32_t map_size[2];
76
            uint_fast8_t  amplitude_bits;
77
            uint_fast8_t  amplitude_offset;
78
            uint_fast8_t  num_books;
79
            uint_fast8_t *book_list;
80
            float        *lsp;
81
        } t0;
82
        struct vorbis_floor1_s {
83
            uint_fast8_t partitions;
84
            uint_fast8_t maximum_class;
85
            uint_fast8_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
    uint_fast32_t 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
} vorbis_residue;
107

    
108
typedef struct {
109
    uint_fast8_t  submaps;
110
    uint_fast16_t coupling_steps;
111
    uint_fast8_t *magnitude;
112
    uint_fast8_t *angle;
113
    uint_fast8_t *mux;
114
    uint_fast8_t  submap_floor[16];
115
    uint_fast8_t  submap_residue[16];
116
} vorbis_mapping;
117

    
118
typedef struct {
119
    uint_fast8_t  blockflag;
120
    uint_fast16_t windowtype;
121
    uint_fast16_t transformtype;
122
    uint_fast8_t  mapping;
123
} vorbis_mode;
124

    
125
typedef struct vorbis_context_s {
126
    AVCodecContext *avccontext;
127
    GetBitContext gb;
128
    DSPContext dsp;
129

    
130
    FFTContext mdct[2];
131
    uint_fast8_t  first_frame;
132
    uint_fast32_t version;
133
    uint_fast8_t  audio_channels;
134
    uint_fast32_t audio_samplerate;
135
    uint_fast32_t bitrate_maximum;
136
    uint_fast32_t bitrate_nominal;
137
    uint_fast32_t bitrate_minimum;
138
    uint_fast32_t blocksize[2];
139
    const float  *win[2];
140
    uint_fast16_t codebook_count;
141
    vorbis_codebook *codebooks;
142
    uint_fast8_t  floor_count;
143
    vorbis_floor *floors;
144
    uint_fast8_t  residue_count;
145
    vorbis_residue *residues;
146
    uint_fast8_t  mapping_count;
147
    vorbis_mapping *mappings;
148
    uint_fast8_t  mode_count;
149
    vorbis_mode  *modes;
150
    uint_fast8_t  mode_number; // mode number for the current packet
151
    uint_fast8_t  previous_window;
152
    float        *channel_residues;
153
    float        *channel_floors;
154
    float        *saved;
155
    uint_fast32_t add_bias; // for float->int conversion
156
    uint_fast32_t exp_bias;
157
} vorbis_context;
158

    
159
/* Helper functions */
160

    
161
#define BARK(x) \
162
    (13.1f * atan(0.00074f * (x)) + 2.24f * atan(1.85e-8f * (x) * (x)) + 1e-4f * (x))
163

    
164
static const char idx_err_str[] = "Index value %d out of range (0 - %d) for %s at %s:%i\n";
165
#define VALIDATE_INDEX(idx, limit) \
166
    if (idx >= limit) {\
167
        av_log(vc->avccontext, AV_LOG_ERROR,\
168
               idx_err_str,\
169
               (int)(idx), (int)(limit - 1), #idx, __FILE__, __LINE__);\
170
        return -1;\
171
    }
172
#define GET_VALIDATED_INDEX(idx, bits, limit) \
173
    {\
174
        idx = get_bits(gb, bits);\
175
        VALIDATE_INDEX(idx, limit)\
176
    }
177

    
178
static float vorbisfloat2float(uint_fast32_t val)
179
{
180
    double mant = val & 0x1fffff;
181
    long exp    = (val & 0x7fe00000L) >> 21;
182
    if (val & 0x80000000)
183
        mant = -mant;
184
    return ldexp(mant, exp - 20 - 768);
185
}
186

    
187

    
188
// Free all allocated memory -----------------------------------------
189

    
190
static void vorbis_free(vorbis_context *vc)
191
{
192
    int_fast16_t i;
193

    
194
    av_freep(&vc->channel_residues);
195
    av_freep(&vc->channel_floors);
196
    av_freep(&vc->saved);
197

    
198
    av_freep(&vc->residues);
199
    av_freep(&vc->modes);
200

    
201
    ff_mdct_end(&vc->mdct[0]);
202
    ff_mdct_end(&vc->mdct[1]);
203

    
204
    for (i = 0; i < vc->codebook_count; ++i) {
205
        av_free(vc->codebooks[i].codevectors);
206
        free_vlc(&vc->codebooks[i].vlc);
207
    }
208
    av_freep(&vc->codebooks);
209

    
210
    for (i = 0; i < vc->floor_count; ++i) {
211
        if (vc->floors[i].floor_type == 0) {
212
            av_free(vc->floors[i].data.t0.map[0]);
213
            av_free(vc->floors[i].data.t0.map[1]);
214
            av_free(vc->floors[i].data.t0.book_list);
215
            av_free(vc->floors[i].data.t0.lsp);
216
        } else {
217
            av_free(vc->floors[i].data.t1.list);
218
        }
219
    }
220
    av_freep(&vc->floors);
221

    
222
    for (i = 0; i < vc->mapping_count; ++i) {
223
        av_free(vc->mappings[i].magnitude);
224
        av_free(vc->mappings[i].angle);
225
        av_free(vc->mappings[i].mux);
226
    }
227
    av_freep(&vc->mappings);
228
}
229

    
230
// Parse setup header -------------------------------------------------
231

    
232
// Process codebooks part
233

    
234
static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc)
235
{
236
    uint_fast16_t cb;
237
    uint8_t  *tmp_vlc_bits;
238
    uint32_t *tmp_vlc_codes;
239
    GetBitContext *gb = &vc->gb;
240

    
241
    vc->codebook_count = get_bits(gb, 8) + 1;
242

    
243
    AV_DEBUG(" Codebooks: %d \n", vc->codebook_count);
244

    
245
    vc->codebooks = av_mallocz(vc->codebook_count * sizeof(vorbis_codebook));
246
    tmp_vlc_bits  = av_mallocz(V_MAX_VLCS * sizeof(uint8_t));
247
    tmp_vlc_codes = av_mallocz(V_MAX_VLCS * sizeof(uint32_t));
248

    
249
    for (cb = 0; cb < vc->codebook_count; ++cb) {
250
        vorbis_codebook *codebook_setup = &vc->codebooks[cb];
251
        uint_fast8_t ordered;
252
        uint_fast32_t t, used_entries = 0;
253
        uint_fast32_t entries;
254

    
255
        AV_DEBUG(" %d. Codebook \n", cb);
256

    
257
        if (get_bits(gb, 24) != 0x564342) {
258
            av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook setup data corrupt. \n", cb);
259
            goto error;
260
        }
261

    
262
        codebook_setup->dimensions=get_bits(gb, 16);
263
        if (codebook_setup->dimensions > 16 || codebook_setup->dimensions == 0) {
264
            av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook's dimension is invalid (%d). \n", cb, codebook_setup->dimensions);
265
            goto error;
266
        }
267
        entries = get_bits(gb, 24);
268
        if (entries > V_MAX_VLCS) {
269
            av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook has too many entries (%"PRIdFAST32"). \n", cb, entries);
270
            goto error;
271
        }
272

    
273
        ordered = get_bits1(gb);
274

    
275
        AV_DEBUG(" codebook_dimensions %d, codebook_entries %d \n", codebook_setup->dimensions, entries);
276

    
277
        if (!ordered) {
278
            uint_fast16_t ce;
279
            uint_fast8_t  flag;
280
            uint_fast8_t  sparse = get_bits1(gb);
281

    
282
            AV_DEBUG(" not ordered \n");
283

    
284
            if (sparse) {
285
                AV_DEBUG(" sparse \n");
286

    
287
                used_entries = 0;
288
                for (ce = 0; ce < entries; ++ce) {
289
                    flag = get_bits1(gb);
290
                    if (flag) {
291
                        tmp_vlc_bits[ce] = get_bits(gb, 5) + 1;
292
                        ++used_entries;
293
                    } else
294
                        tmp_vlc_bits[ce] = 0;
295
                }
296
            } else {
297
                AV_DEBUG(" not sparse \n");
298

    
299
                used_entries = entries;
300
                for (ce = 0; ce < entries; ++ce)
301
                    tmp_vlc_bits[ce] = get_bits(gb, 5) + 1;
302
            }
303
        } else {
304
            uint_fast16_t current_entry = 0;
305
            uint_fast8_t current_length = get_bits(gb, 5)+1;
306

    
307
            AV_DEBUG(" ordered, current length: %d \n", current_length);  //FIXME
308

    
309
            used_entries = entries;
310
            for (; current_entry < used_entries && current_length <= 32; ++current_length) {
311
                uint_fast16_t i, number;
312

    
313
                AV_DEBUG(" number bits: %d ", ilog(entries - current_entry));
314

    
315
                number = get_bits(gb, ilog(entries - current_entry));
316

    
317
                AV_DEBUG(" number: %d \n", number);
318

    
319
                for (i = current_entry; i < number+current_entry; ++i)
320
                    if (i < used_entries)
321
                        tmp_vlc_bits[i] = current_length;
322

    
323
                current_entry+=number;
324
            }
325
            if (current_entry>used_entries) {
326
                av_log(vc->avccontext, AV_LOG_ERROR, " More codelengths than codes in codebook. \n");
327
                goto error;
328
            }
329
        }
330

    
331
        codebook_setup->lookup_type = get_bits(gb, 4);
332

    
333
        AV_DEBUG(" lookup type: %d : %s \n", codebook_setup->lookup_type, codebook_setup->lookup_type ? "vq" : "no lookup");
334

    
335
// If the codebook is used for (inverse) VQ, calculate codevectors.
336

    
337
        if (codebook_setup->lookup_type == 1) {
338
            uint_fast16_t i, j, k;
339
            uint_fast16_t codebook_lookup_values = ff_vorbis_nth_root(entries, codebook_setup->dimensions);
340
            uint_fast16_t codebook_multiplicands[codebook_lookup_values];
341

    
342
            float codebook_minimum_value = vorbisfloat2float(get_bits_long(gb, 32));
343
            float codebook_delta_value   = vorbisfloat2float(get_bits_long(gb, 32));
344
            uint_fast8_t codebook_value_bits = get_bits(gb, 4)+1;
345
            uint_fast8_t codebook_sequence_p = get_bits1(gb);
346

    
347
            AV_DEBUG(" We expect %d numbers for building the codevectors. \n", codebook_lookup_values);
348
            AV_DEBUG("  delta %f minmum %f \n", codebook_delta_value, codebook_minimum_value);
349

    
350
            for (i = 0; i < codebook_lookup_values; ++i) {
351
                codebook_multiplicands[i] = get_bits(gb, codebook_value_bits);
352

    
353
                AV_DEBUG(" multiplicands*delta+minmum : %e \n", (float)codebook_multiplicands[i]*codebook_delta_value+codebook_minimum_value);
354
                AV_DEBUG(" multiplicand %d \n", codebook_multiplicands[i]);
355
            }
356

    
357
// Weed out unused vlcs and build codevector vector
358
            codebook_setup->codevectors = used_entries ? av_mallocz(used_entries*codebook_setup->dimensions * sizeof(float)) : NULL;
359
            for (j = 0, i = 0; i < entries; ++i) {
360
                uint_fast8_t dim = codebook_setup->dimensions;
361

    
362
                if (tmp_vlc_bits[i]) {
363
                    float last = 0.0;
364
                    uint_fast32_t lookup_offset = i;
365

    
366
#ifdef V_DEBUG
367
                    av_log(vc->avccontext, AV_LOG_INFO, "Lookup offset %d ,", i);
368
#endif
369

    
370
                    for (k = 0; k < dim; ++k) {
371
                        uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values;
372
                        codebook_setup->codevectors[j * dim + k] = codebook_multiplicands[multiplicand_offset] * codebook_delta_value + codebook_minimum_value + last;
373
                        if (codebook_sequence_p)
374
                            last = codebook_setup->codevectors[j * dim + k];
375
                        lookup_offset/=codebook_lookup_values;
376
                    }
377
                    tmp_vlc_bits[j] = tmp_vlc_bits[i];
378

    
379
#ifdef V_DEBUG
380
                    av_log(vc->avccontext, AV_LOG_INFO, "real lookup offset %d, vector: ", j);
381
                    for (k = 0; k < dim; ++k)
382
                        av_log(vc->avccontext, AV_LOG_INFO, " %f ", codebook_setup->codevectors[j * dim + k]);
383
                    av_log(vc->avccontext, AV_LOG_INFO, "\n");
384
#endif
385

    
386
                    ++j;
387
                }
388
            }
389
            if (j != used_entries) {
390
                av_log(vc->avccontext, AV_LOG_ERROR, "Bug in codevector vector building code. \n");
391
                goto error;
392
            }
393
            entries = used_entries;
394
        } else if (codebook_setup->lookup_type >= 2) {
395
            av_log(vc->avccontext, AV_LOG_ERROR, "Codebook lookup type not supported. \n");
396
            goto error;
397
        }
398

    
399
// Initialize VLC table
400
        if (ff_vorbis_len2vlc(tmp_vlc_bits, tmp_vlc_codes, entries)) {
401
            av_log(vc->avccontext, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");
402
            goto error;
403
        }
404
        codebook_setup->maxdepth = 0;
405
        for (t = 0; t < entries; ++t)
406
            if (tmp_vlc_bits[t] >= codebook_setup->maxdepth)
407
                codebook_setup->maxdepth = tmp_vlc_bits[t];
408

    
409
        if (codebook_setup->maxdepth > 3 * V_NB_BITS)
410
            codebook_setup->nb_bits = V_NB_BITS2;
411
        else
412
            codebook_setup->nb_bits = V_NB_BITS;
413

    
414
        codebook_setup->maxdepth = (codebook_setup->maxdepth+codebook_setup->nb_bits - 1) / codebook_setup->nb_bits;
415

    
416
        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)) {
417
            av_log(vc->avccontext, AV_LOG_ERROR, " Error generating vlc tables. \n");
418
            goto error;
419
        }
420
    }
421

    
422
    av_free(tmp_vlc_bits);
423
    av_free(tmp_vlc_codes);
424
    return 0;
425

    
426
// Error:
427
error:
428
    av_free(tmp_vlc_bits);
429
    av_free(tmp_vlc_codes);
430
    return -1;
431
}
432

    
433
// Process time domain transforms part (unused in Vorbis I)
434

    
435
static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc)
436
{
437
    GetBitContext *gb = &vc->gb;
438
    uint_fast8_t i;
439
    uint_fast8_t vorbis_time_count = get_bits(gb, 6) + 1;
440

    
441
    for (i = 0; i < vorbis_time_count; ++i) {
442
        uint_fast16_t vorbis_tdtransform = get_bits(gb, 16);
443

    
444
        AV_DEBUG(" Vorbis time domain transform %d: %d \n", vorbis_time_count, vorbis_tdtransform);
445

    
446
        if (vorbis_tdtransform) {
447
            av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n");
448
            return -1;
449
        }
450
    }
451
    return 0;
452
}
453

    
454
// Process floors part
455

    
456
static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,
457
                                         vorbis_floor_data *vfu, float *vec);
458
static void create_map(vorbis_context *vc, uint_fast8_t floor_number);
459
static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc,
460
                                         vorbis_floor_data *vfu, float *vec);
461
static int vorbis_parse_setup_hdr_floors(vorbis_context *vc)
462
{
463
    GetBitContext *gb = &vc->gb;
464
    uint_fast16_t i,j,k;
465

    
466
    vc->floor_count = get_bits(gb, 6) + 1;
467

    
468
    vc->floors = av_mallocz(vc->floor_count * sizeof(vorbis_floor));
469

    
470
    for (i = 0; i < vc->floor_count; ++i) {
471
        vorbis_floor *floor_setup = &vc->floors[i];
472

    
473
        floor_setup->floor_type = get_bits(gb, 16);
474

    
475
        AV_DEBUG(" %d. floor type %d \n", i, floor_setup->floor_type);
476

    
477
        if (floor_setup->floor_type == 1) {
478
            uint_fast8_t  maximum_class = 0;
479
            uint_fast8_t  rangebits;
480
            uint_fast16_t floor1_values = 2;
481

    
482
            floor_setup->decode = vorbis_floor1_decode;
483

    
484
            floor_setup->data.t1.partitions = get_bits(gb, 5);
485

    
486
            AV_DEBUG(" %d.floor: %d partitions \n", i, floor_setup->data.t1.partitions);
487

    
488
            for (j = 0; j < floor_setup->data.t1.partitions; ++j) {
489
                floor_setup->data.t1.partition_class[j] = get_bits(gb, 4);
490
                if (floor_setup->data.t1.partition_class[j] > maximum_class)
491
                    maximum_class = floor_setup->data.t1.partition_class[j];
492

    
493
                AV_DEBUG(" %d. floor %d partition class %d \n", i, j, floor_setup->data.t1.partition_class[j]);
494

    
495
            }
496

    
497
            AV_DEBUG(" maximum class %d \n", maximum_class);
498

    
499
            floor_setup->data.t1.maximum_class = maximum_class;
500

    
501
            for (j = 0; j <= maximum_class; ++j) {
502
                floor_setup->data.t1.class_dimensions[j] = get_bits(gb, 3) + 1;
503
                floor_setup->data.t1.class_subclasses[j] = get_bits(gb, 2);
504

    
505
                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]);
506

    
507
                if (floor_setup->data.t1.class_subclasses[j]) {
508
                    GET_VALIDATED_INDEX(floor_setup->data.t1.class_masterbook[j], 8, vc->codebook_count)
509

    
510
                    AV_DEBUG("   masterbook: %d \n", floor_setup->data.t1.class_masterbook[j]);
511
                }
512

    
513
                for (k = 0; k < (1 << floor_setup->data.t1.class_subclasses[j]); ++k) {
514
                    int16_t bits = get_bits(gb, 8) - 1;
515
                    if (bits != -1)
516
                        VALIDATE_INDEX(bits, vc->codebook_count)
517
                    floor_setup->data.t1.subclass_books[j][k] = bits;
518

    
519
                    AV_DEBUG("    book %d. : %d \n", k, floor_setup->data.t1.subclass_books[j][k]);
520
                }
521
            }
522

    
523
            floor_setup->data.t1.multiplier = get_bits(gb, 2) + 1;
524
            floor_setup->data.t1.x_list_dim = 2;
525

    
526
            for (j = 0; j < floor_setup->data.t1.partitions; ++j)
527
                floor_setup->data.t1.x_list_dim+=floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];
528

    
529
            floor_setup->data.t1.list = av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(vorbis_floor1_entry));
530

    
531

    
532
            rangebits = get_bits(gb, 4);
533
            floor_setup->data.t1.list[0].x = 0;
534
            floor_setup->data.t1.list[1].x = (1 << rangebits);
535

    
536
            for (j = 0; j < floor_setup->data.t1.partitions; ++j) {
537
                for (k = 0; k < floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]]; ++k, ++floor1_values) {
538
                    floor_setup->data.t1.list[floor1_values].x = get_bits(gb, rangebits);
539

    
540
                    AV_DEBUG(" %d. floor1 Y coord. %d \n", floor1_values, floor_setup->data.t1.list[floor1_values].x);
541
                }
542
            }
543

    
544
// Precalculate order of x coordinates - needed for decode
545
            ff_vorbis_ready_floor1_list(floor_setup->data.t1.list, floor_setup->data.t1.x_list_dim);
546
        } else if (floor_setup->floor_type == 0) {
547
            uint_fast8_t max_codebook_dim = 0;
548

    
549
            floor_setup->decode = vorbis_floor0_decode;
550

    
551
            floor_setup->data.t0.order          = get_bits(gb,  8);
552
            floor_setup->data.t0.rate           = get_bits(gb, 16);
553
            floor_setup->data.t0.bark_map_size  = get_bits(gb, 16);
554
            floor_setup->data.t0.amplitude_bits = get_bits(gb,  6);
555
            /* zero would result in a div by zero later *
556
             * 2^0 - 1 == 0                             */
557
            if (floor_setup->data.t0.amplitude_bits == 0) {
558
              av_log(vc->avccontext, AV_LOG_ERROR,
559
                     "Floor 0 amplitude bits is 0.\n");
560
              return -1;
561
            }
562
            floor_setup->data.t0.amplitude_offset = get_bits(gb, 8);
563
            floor_setup->data.t0.num_books        = get_bits(gb, 4) + 1;
564

    
565
            /* allocate mem for booklist */
566
            floor_setup->data.t0.book_list =
567
                av_malloc(floor_setup->data.t0.num_books);
568
            if (!floor_setup->data.t0.book_list)
569
                return -1;
570
            /* read book indexes */
571
            {
572
                int idx;
573
                uint_fast8_t book_idx;
574
                for (idx = 0; idx < floor_setup->data.t0.num_books; ++idx) {
575
                    GET_VALIDATED_INDEX(floor_setup->data.t0.book_list[idx], 8, vc->codebook_count)
576
                    if (vc->codebooks[book_idx].dimensions > max_codebook_dim)
577
                        max_codebook_dim = vc->codebooks[book_idx].dimensions;
578
                }
579
            }
580

    
581
            create_map(vc, i);
582

    
583
            /* allocate mem for lsp coefficients */
584
            {
585
                /* codebook dim is for padding if codebook dim doesn't *
586
                 * divide order+1 then we need to read more data       */
587
                floor_setup->data.t0.lsp =
588
                    av_malloc((floor_setup->data.t0.order+1 + max_codebook_dim)
589
                              * sizeof(float));
590
                if (!floor_setup->data.t0.lsp)
591
                    return -1;
592
            }
593

    
594
#ifdef V_DEBUG /* debug output parsed headers */
595
            AV_DEBUG("floor0 order: %u\n", floor_setup->data.t0.order);
596
            AV_DEBUG("floor0 rate: %u\n", floor_setup->data.t0.rate);
597
            AV_DEBUG("floor0 bark map size: %u\n",
598
              floor_setup->data.t0.bark_map_size);
599
            AV_DEBUG("floor0 amplitude bits: %u\n",
600
              floor_setup->data.t0.amplitude_bits);
601
            AV_DEBUG("floor0 amplitude offset: %u\n",
602
              floor_setup->data.t0.amplitude_offset);
603
            AV_DEBUG("floor0 number of books: %u\n",
604
              floor_setup->data.t0.num_books);
605
            AV_DEBUG("floor0 book list pointer: %p\n",
606
              floor_setup->data.t0.book_list);
607
            {
608
              int idx;
609
              for (idx = 0; idx < floor_setup->data.t0.num_books; ++idx) {
610
                  AV_DEBUG("  Book %d: %u\n",
611
                           idx+1,
612
                           floor_setup->data.t0.book_list[idx]);
613
              }
614
            }
615
#endif
616
        } else {
617
            av_log(vc->avccontext, AV_LOG_ERROR, "Invalid floor type!\n");
618
            return -1;
619
        }
620
    }
621
    return 0;
622
}
623

    
624
// Process residues part
625

    
626
static int vorbis_parse_setup_hdr_residues(vorbis_context *vc)
627
{
628
    GetBitContext *gb = &vc->gb;
629
    uint_fast8_t i, j, k;
630

    
631
    vc->residue_count = get_bits(gb, 6)+1;
632
    vc->residues      = av_mallocz(vc->residue_count * sizeof(vorbis_residue));
633

    
634
    AV_DEBUG(" There are %d residues. \n", vc->residue_count);
635

    
636
    for (i = 0; i < vc->residue_count; ++i) {
637
        vorbis_residue *res_setup = &vc->residues[i];
638
        uint_fast8_t cascade[64];
639
        uint_fast8_t high_bits;
640
        uint_fast8_t low_bits;
641

    
642
        res_setup->type = get_bits(gb, 16);
643

    
644
        AV_DEBUG(" %d. residue type %d \n", i, res_setup->type);
645

    
646
        res_setup->begin          = get_bits(gb, 24);
647
        res_setup->end            = get_bits(gb, 24);
648
        res_setup->partition_size = get_bits(gb, 24) + 1;
649
        /* Validations to prevent a buffer overflow later. */
650
        if (res_setup->begin>res_setup->end ||
651
            res_setup->end>vc->blocksize[1] / (res_setup->type == 2 ? 1 : 2) ||
652
            (res_setup->end-res_setup->begin) / res_setup->partition_size > V_MAX_PARTITIONS) {
653
            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);
654
            return -1;
655
        }
656

    
657
        res_setup->classifications = get_bits(gb, 6) + 1;
658
        GET_VALIDATED_INDEX(res_setup->classbook, 8, vc->codebook_count)
659

    
660
        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,
661
          res_setup->classifications, res_setup->classbook);
662

    
663
        for (j = 0; j < res_setup->classifications; ++j) {
664
            high_bits = 0;
665
            low_bits  = get_bits(gb, 3);
666
            if (get_bits1(gb))
667
                high_bits = get_bits(gb, 5);
668
            cascade[j] = (high_bits << 3) + low_bits;
669

    
670
            AV_DEBUG("     %d class casscade depth: %d \n", j, ilog(cascade[j]));
671
        }
672

    
673
        res_setup->maxpass = 0;
674
        for (j = 0; j < res_setup->classifications; ++j) {
675
            for (k = 0; k < 8; ++k) {
676
                if (cascade[j]&(1 << k)) {
677
                    GET_VALIDATED_INDEX(res_setup->books[j][k], 8, vc->codebook_count)
678

    
679
                    AV_DEBUG("     %d class casscade depth %d book: %d \n", j, k, res_setup->books[j][k]);
680

    
681
                    if (k>res_setup->maxpass)
682
                        res_setup->maxpass = k;
683
                } else {
684
                    res_setup->books[j][k] = -1;
685
                }
686
            }
687
        }
688
    }
689
    return 0;
690
}
691

    
692
// Process mappings part
693

    
694
static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc)
695
{
696
    GetBitContext *gb = &vc->gb;
697
    uint_fast8_t i, j;
698

    
699
    vc->mapping_count = get_bits(gb, 6)+1;
700
    vc->mappings      = av_mallocz(vc->mapping_count * sizeof(vorbis_mapping));
701

    
702
    AV_DEBUG(" There are %d mappings. \n", vc->mapping_count);
703

    
704
    for (i = 0; i < vc->mapping_count; ++i) {
705
        vorbis_mapping *mapping_setup = &vc->mappings[i];
706

    
707
        if (get_bits(gb, 16)) {
708
            av_log(vc->avccontext, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n");
709
            return -1;
710
        }
711
        if (get_bits1(gb)) {
712
            mapping_setup->submaps = get_bits(gb, 4) + 1;
713
        } else {
714
            mapping_setup->submaps = 1;
715
        }
716

    
717
        if (get_bits1(gb)) {
718
            mapping_setup->coupling_steps = get_bits(gb, 8) + 1;
719
            mapping_setup->magnitude      = av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
720
            mapping_setup->angle          = av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
721
            for (j = 0; j < mapping_setup->coupling_steps; ++j) {
722
                GET_VALIDATED_INDEX(mapping_setup->magnitude[j], ilog(vc->audio_channels - 1), vc->audio_channels)
723
                GET_VALIDATED_INDEX(mapping_setup->angle[j],     ilog(vc->audio_channels - 1), vc->audio_channels)
724
            }
725
        } else {
726
            mapping_setup->coupling_steps = 0;
727
        }
728

    
729
        AV_DEBUG("   %d mapping coupling steps: %d \n", i, mapping_setup->coupling_steps);
730

    
731
        if (get_bits(gb, 2)) {
732
            av_log(vc->avccontext, AV_LOG_ERROR, "%d. mapping setup data invalid. \n", i);
733
            return -1; // following spec.
734
        }
735

    
736
        if (mapping_setup->submaps>1) {
737
            mapping_setup->mux = av_mallocz(vc->audio_channels * sizeof(uint_fast8_t));
738
            for (j = 0; j < vc->audio_channels; ++j)
739
                mapping_setup->mux[j] = get_bits(gb, 4);
740
        }
741

    
742
        for (j = 0; j < mapping_setup->submaps; ++j) {
743
            skip_bits(gb, 8); // FIXME check?
744
            GET_VALIDATED_INDEX(mapping_setup->submap_floor[j],   8, vc->floor_count)
745
            GET_VALIDATED_INDEX(mapping_setup->submap_residue[j], 8, vc->residue_count)
746

    
747
            AV_DEBUG("   %d mapping %d submap : floor %d, residue %d \n", i, j, mapping_setup->submap_floor[j], mapping_setup->submap_residue[j]);
748
        }
749
    }
750
    return 0;
751
}
752

    
753
// Process modes part
754

    
755
static void create_map(vorbis_context *vc, uint_fast8_t floor_number)
756
{
757
    vorbis_floor *floors = vc->floors;
758
    vorbis_floor0 *vf;
759
    int idx;
760
    int_fast8_t blockflag;
761
    int_fast32_t *map;
762
    int_fast32_t n; //TODO: could theoretically be smaller?
763

    
764
    for (blockflag = 0; blockflag < 2; ++blockflag) {
765
        n = vc->blocksize[blockflag] / 2;
766
        floors[floor_number].data.t0.map[blockflag] =
767
            av_malloc((n+1) * sizeof(int_fast32_t)); // n + sentinel
768

    
769
        map =  floors[floor_number].data.t0.map[blockflag];
770
        vf  = &floors[floor_number].data.t0;
771

    
772
        for (idx = 0; idx < n; ++idx) {
773
            map[idx] = floor(BARK((vf->rate * idx) / (2.0f * n)) *
774
                             ((vf->bark_map_size) /
775
                              BARK(vf->rate / 2.0f)));
776
            if (vf->bark_map_size-1 < map[idx])
777
                map[idx] = vf->bark_map_size - 1;
778
        }
779
        map[n] = -1;
780
        vf->map_size[blockflag] = n;
781
    }
782

    
783
#   ifdef V_DEBUG
784
    for (idx = 0; idx <= n; ++idx) {
785
        AV_DEBUG("floor0 map: map at pos %d is %d\n",
786
                 idx, map[idx]);
787
    }
788
#   endif
789
}
790

    
791
static int vorbis_parse_setup_hdr_modes(vorbis_context *vc)
792
{
793
    GetBitContext *gb = &vc->gb;
794
    uint_fast8_t i;
795

    
796
    vc->mode_count = get_bits(gb, 6) + 1;
797
    vc->modes      = av_mallocz(vc->mode_count * sizeof(vorbis_mode));
798

    
799
    AV_DEBUG(" There are %d modes.\n", vc->mode_count);
800

    
801
    for (i = 0; i < vc->mode_count; ++i) {
802
        vorbis_mode *mode_setup = &vc->modes[i];
803

    
804
        mode_setup->blockflag     = get_bits1(gb);
805
        mode_setup->windowtype    = get_bits(gb, 16); //FIXME check
806
        mode_setup->transformtype = get_bits(gb, 16); //FIXME check
807
        GET_VALIDATED_INDEX(mode_setup->mapping, 8, vc->mapping_count);
808

    
809
        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);
810
    }
811
    return 0;
812
}
813

    
814
// Process the whole setup header using the functions above
815

    
816
static int vorbis_parse_setup_hdr(vorbis_context *vc)
817
{
818
    GetBitContext *gb = &vc->gb;
819

    
820
    if ((get_bits(gb, 8) != 'v') || (get_bits(gb, 8) != 'o') ||
821
        (get_bits(gb, 8) != 'r') || (get_bits(gb, 8) != 'b') ||
822
        (get_bits(gb, 8) != 'i') || (get_bits(gb, 8) != 's')) {
823
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n");
824
        return -1;
825
    }
826

    
827
    if (vorbis_parse_setup_hdr_codebooks(vc)) {
828
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n");
829
        return -2;
830
    }
831
    if (vorbis_parse_setup_hdr_tdtransforms(vc)) {
832
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n");
833
        return -3;
834
    }
835
    if (vorbis_parse_setup_hdr_floors(vc)) {
836
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n");
837
        return -4;
838
    }
839
    if (vorbis_parse_setup_hdr_residues(vc)) {
840
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n");
841
        return -5;
842
    }
843
    if (vorbis_parse_setup_hdr_mappings(vc)) {
844
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n");
845
        return -6;
846
    }
847
    if (vorbis_parse_setup_hdr_modes(vc)) {
848
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n");
849
        return -7;
850
    }
851
    if (!get_bits1(gb)) {
852
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n");
853
        return -8; // framing flag bit unset error
854
    }
855

    
856
    return 0;
857
}
858

    
859
// Process the identification header
860

    
861
static int vorbis_parse_id_hdr(vorbis_context *vc)
862
{
863
    GetBitContext *gb = &vc->gb;
864
    uint_fast8_t bl0, bl1;
865

    
866
    if ((get_bits(gb, 8) != 'v') || (get_bits(gb, 8) != 'o') ||
867
        (get_bits(gb, 8) != 'r') || (get_bits(gb, 8) != 'b') ||
868
        (get_bits(gb, 8) != 'i') || (get_bits(gb, 8) != 's')) {
869
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n");
870
        return -1;
871
    }
872

    
873
    vc->version        = get_bits_long(gb, 32);    //FIXME check 0
874
    vc->audio_channels = get_bits(gb, 8);
875
    if (vc->audio_channels <= 0) {
876
        av_log(vc->avccontext, AV_LOG_ERROR, "Invalid number of channels\n");
877
        return -1;
878
    }
879
    vc->audio_samplerate = get_bits_long(gb, 32);
880
    if (vc->audio_samplerate <= 0) {
881
        av_log(vc->avccontext, AV_LOG_ERROR, "Invalid samplerate\n");
882
        return -1;
883
    }
884
    vc->bitrate_maximum = get_bits_long(gb, 32);
885
    vc->bitrate_nominal = get_bits_long(gb, 32);
886
    vc->bitrate_minimum = get_bits_long(gb, 32);
887
    bl0 = get_bits(gb, 4);
888
    bl1 = get_bits(gb, 4);
889
    vc->blocksize[0] = (1 << bl0);
890
    vc->blocksize[1] = (1 << bl1);
891
    if (bl0 > 13 || bl0 < 6 || bl1 > 13 || bl1 < 6 || bl1 < bl0) {
892
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n");
893
        return -3;
894
    }
895
    // output format int16
896
    if (vc->blocksize[1] / 2 * vc->audio_channels * 2 > AVCODEC_MAX_AUDIO_FRAME_SIZE) {
897
        av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis channel count makes "
898
               "output packets too large.\n");
899
        return -4;
900
    }
901
    vc->win[0] = ff_vorbis_vwin[bl0 - 6];
902
    vc->win[1] = ff_vorbis_vwin[bl1 - 6];
903

    
904
    if ((get_bits1(gb)) == 0) {
905
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n");
906
        return -2;
907
    }
908

    
909
    vc->channel_residues =  av_malloc((vc->blocksize[1]  / 2) * vc->audio_channels * sizeof(float));
910
    vc->channel_floors   =  av_malloc((vc->blocksize[1]  / 2) * vc->audio_channels * sizeof(float));
911
    vc->saved            =  av_mallocz((vc->blocksize[1] / 4) * vc->audio_channels * sizeof(float));
912
    vc->previous_window  = 0;
913

    
914
    ff_mdct_init(&vc->mdct[0], bl0, 1, vc->exp_bias ? -(1 << 15) : -1.0);
915
    ff_mdct_init(&vc->mdct[1], bl1, 1, vc->exp_bias ? -(1 << 15) : -1.0);
916

    
917
    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 ",
918
            vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize[0], vc->blocksize[1]);
919

    
920
/*
921
    BLK = vc->blocksize[0];
922
    for (i = 0; i < BLK / 2; ++i) {
923
        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)));
924
    }
925
*/
926

    
927
    return 0;
928
}
929

    
930
// Process the extradata using the functions above (identification header, setup header)
931

    
932
static av_cold int vorbis_decode_init(AVCodecContext *avccontext)
933
{
934
    vorbis_context *vc = avccontext->priv_data ;
935
    uint8_t *headers   = avccontext->extradata;
936
    int headers_len    = avccontext->extradata_size;
937
    uint8_t *header_start[3];
938
    int header_len[3];
939
    GetBitContext *gb = &(vc->gb);
940
    int hdr_type;
941

    
942
    vc->avccontext = avccontext;
943
    dsputil_init(&vc->dsp, avccontext);
944

    
945
    if (vc->dsp.float_to_int16_interleave == ff_float_to_int16_interleave_c) {
946
        vc->add_bias = 385;
947
        vc->exp_bias = 0;
948
    } else {
949
        vc->add_bias = 0;
950
        vc->exp_bias = 15 << 23;
951
    }
952

    
953
    if (!headers_len) {
954
        av_log(avccontext, AV_LOG_ERROR, "Extradata missing.\n");
955
        return -1;
956
    }
957

    
958
    if (ff_split_xiph_headers(headers, headers_len, 30, header_start, header_len) < 0) {
959
        av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
960
        return -1;
961
    }
962

    
963
    init_get_bits(gb, header_start[0], header_len[0]*8);
964
    hdr_type = get_bits(gb, 8);
965
    if (hdr_type != 1) {
966
        av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n");
967
        return -1;
968
    }
969
    if (vorbis_parse_id_hdr(vc)) {
970
        av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n");
971
        vorbis_free(vc);
972
        return -1;
973
    }
974

    
975
    init_get_bits(gb, header_start[2], header_len[2]*8);
976
    hdr_type = get_bits(gb, 8);
977
    if (hdr_type != 5) {
978
        av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");
979
        vorbis_free(vc);
980
        return -1;
981
    }
982
    if (vorbis_parse_setup_hdr(vc)) {
983
        av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");
984
        vorbis_free(vc);
985
        return -1;
986
    }
987

    
988
    if (vc->audio_channels > 8)
989
        avccontext->channel_layout = 0;
990
    else
991
        avccontext->channel_layout = ff_vorbis_channel_layouts[vc->audio_channels - 1];
992

    
993
    avccontext->channels    = vc->audio_channels;
994
    avccontext->sample_rate = vc->audio_samplerate;
995
    avccontext->frame_size  = FFMIN(vc->blocksize[0], vc->blocksize[1]) >> 2;
996
    avccontext->sample_fmt  = SAMPLE_FMT_S16;
997

    
998
    return 0 ;
999
}
1000

    
1001
// Decode audiopackets -------------------------------------------------
1002

    
1003
// Read and decode floor
1004

    
1005
static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,
1006
                                         vorbis_floor_data *vfu, float *vec)
1007
{
1008
    vorbis_floor0 *vf = &vfu->t0;
1009
    float *lsp = vf->lsp;
1010
    uint_fast32_t amplitude;
1011
    uint_fast32_t book_idx;
1012
    uint_fast8_t blockflag = vc->modes[vc->mode_number].blockflag;
1013

    
1014
    amplitude = get_bits(&vc->gb, vf->amplitude_bits);
1015
    if (amplitude > 0) {
1016
        float last = 0;
1017
        uint_fast16_t lsp_len = 0;
1018
        uint_fast16_t idx;
1019
        vorbis_codebook codebook;
1020

    
1021
        book_idx = get_bits(&vc->gb, ilog(vf->num_books));
1022
        if (book_idx >= vf->num_books) {
1023
            av_log(vc->avccontext, AV_LOG_ERROR,
1024
                    "floor0 dec: booknumber too high!\n");
1025
            book_idx =  0;
1026
            //FIXME: look above
1027
        }
1028
        AV_DEBUG("floor0 dec: booknumber: %u\n", book_idx);
1029
        codebook = vc->codebooks[vf->book_list[book_idx]];
1030

    
1031
        while (lsp_len<vf->order) {
1032
            int vec_off;
1033

    
1034
            AV_DEBUG("floor0 dec: book dimension: %d\n", codebook.dimensions);
1035
            AV_DEBUG("floor0 dec: maximum depth: %d\n", codebook.maxdepth);
1036
            /* read temp vector */
1037
            vec_off = get_vlc2(&vc->gb, codebook.vlc.table,
1038
                               codebook.nb_bits, codebook.maxdepth)
1039
                      * codebook.dimensions;
1040
            AV_DEBUG("floor0 dec: vector offset: %d\n", vec_off);
1041
            /* copy each vector component and add last to it */
1042
            for (idx = 0; idx < codebook.dimensions; ++idx)
1043
                lsp[lsp_len+idx] = codebook.codevectors[vec_off+idx] + last;
1044
            last = lsp[lsp_len+idx-1]; /* set last to last vector component */
1045

    
1046
            lsp_len += codebook.dimensions;
1047
        }
1048
#ifdef V_DEBUG
1049
        /* DEBUG: output lsp coeffs */
1050
        {
1051
            int idx;
1052
            for (idx = 0; idx < lsp_len; ++idx)
1053
                AV_DEBUG("floor0 dec: coeff at %d is %f\n", idx, lsp[idx]);
1054
        }
1055
#endif
1056

    
1057
        /* synthesize floor output vector */
1058
        {
1059
            int i;
1060
            int order = vf->order;
1061
            float wstep = M_PI / vf->bark_map_size;
1062

    
1063
            for (i = 0; i < order; i++)
1064
                lsp[i] = 2.0f * cos(lsp[i]);
1065

    
1066
            AV_DEBUG("floor0 synth: map_size = %d; m = %d; wstep = %f\n",
1067
                     vf->map_size, order, wstep);
1068

    
1069
            i = 0;
1070
            while (i < vf->map_size[blockflag]) {
1071
                int j, iter_cond = vf->map[blockflag][i];
1072
                float p = 0.5f;
1073
                float q = 0.5f;
1074
                float two_cos_w = 2.0f * cos(wstep * iter_cond); // needed all times
1075

    
1076
                /* similar part for the q and p products */
1077
                for (j = 0; j + 1 < order; j += 2) {
1078
                    q *= lsp[j]     - two_cos_w;
1079
                    p *= lsp[j + 1] - two_cos_w;
1080
                }
1081
                if (j == order) { // even order
1082
                    p *= p * (2.0f - two_cos_w);
1083
                    q *= q * (2.0f + two_cos_w);
1084
                } else { // odd order
1085
                    q *= two_cos_w-lsp[j]; // one more time for q
1086

    
1087
                    /* final step and square */
1088
                    p *= p * (4.f - two_cos_w * two_cos_w);
1089
                    q *= q;
1090
                }
1091

    
1092
                /* calculate linear floor value */
1093
                {
1094
                    q = exp((((amplitude*vf->amplitude_offset) /
1095
                              (((1 << vf->amplitude_bits) - 1) * sqrt(p + q)))
1096
                             - vf->amplitude_offset) * .11512925f);
1097
                }
1098

    
1099
                /* fill vector */
1100
                do {
1101
                    vec[i] = q; ++i;
1102
                } while (vf->map[blockflag][i] == iter_cond);
1103
            }
1104
        }
1105
    } else {
1106
        /* this channel is unused */
1107
        return 1;
1108
    }
1109

    
1110
    AV_DEBUG(" Floor0 decoded\n");
1111

    
1112
    return 0;
1113
}
1114

    
1115
static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc,
1116
                                         vorbis_floor_data *vfu, float *vec)
1117
{
1118
    vorbis_floor1 *vf = &vfu->t1;
1119
    GetBitContext *gb = &vc->gb;
1120
    uint_fast16_t range_v[4] = { 256, 128, 86, 64 };
1121
    uint_fast16_t range = range_v[vf->multiplier-1];
1122
    uint_fast16_t floor1_Y[vf->x_list_dim];
1123
    uint_fast16_t floor1_Y_final[vf->x_list_dim];
1124
    int floor1_flag[vf->x_list_dim];
1125
    uint_fast8_t class_;
1126
    uint_fast8_t cdim;
1127
    uint_fast8_t cbits;
1128
    uint_fast8_t csub;
1129
    uint_fast8_t cval;
1130
    int_fast16_t book;
1131
    uint_fast16_t offset;
1132
    uint_fast16_t i,j;
1133
    /*u*/int_fast16_t adx, ady, off, predicted; // WTF ? dy/adx =  (unsigned)dy/adx ?
1134
    int_fast16_t dy, err;
1135

    
1136

    
1137
    if (!get_bits1(gb)) // silence
1138
        return 1;
1139

    
1140
// Read values (or differences) for the floor's points
1141

    
1142
    floor1_Y[0] = get_bits(gb, ilog(range - 1));
1143
    floor1_Y[1] = get_bits(gb, ilog(range - 1));
1144

    
1145
    AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);
1146

    
1147
    offset = 2;
1148
    for (i = 0; i < vf->partitions; ++i) {
1149
        class_ = vf->partition_class[i];
1150
        cdim   = vf->class_dimensions[class_];
1151
        cbits  = vf->class_subclasses[class_];
1152
        csub = (1 << cbits) - 1;
1153
        cval = 0;
1154

    
1155
        AV_DEBUG("Cbits %d \n", cbits);
1156

    
1157
        if (cbits) // this reads all subclasses for this partition's class
1158
            cval = get_vlc2(gb, vc->codebooks[vf->class_masterbook[class_]].vlc.table,
1159
                            vc->codebooks[vf->class_masterbook[class_]].nb_bits, 3);
1160

    
1161
        for (j = 0; j < cdim; ++j) {
1162
            book = vf->subclass_books[class_][cval & csub];
1163

    
1164
            AV_DEBUG("book %d Cbits %d cval %d  bits:%d \n", book, cbits, cval, get_bits_count(gb));
1165

    
1166
            cval = cval >> cbits;
1167
            if (book > -1) {
1168
                floor1_Y[offset+j] = get_vlc2(gb, vc->codebooks[book].vlc.table,
1169
                vc->codebooks[book].nb_bits, 3);
1170
            } else {
1171
                floor1_Y[offset+j] = 0;
1172
            }
1173

    
1174
            AV_DEBUG(" floor(%d) = %d \n", vf->list[offset+j].x, floor1_Y[offset+j]);
1175
        }
1176
        offset+=cdim;
1177
    }
1178

    
1179
// Amplitude calculation from the differences
1180

    
1181
    floor1_flag[0] = 1;
1182
    floor1_flag[1] = 1;
1183
    floor1_Y_final[0] = floor1_Y[0];
1184
    floor1_Y_final[1] = floor1_Y[1];
1185

    
1186
    for (i = 2; i < vf->x_list_dim; ++i) {
1187
        uint_fast16_t val, highroom, lowroom, room;
1188
        uint_fast16_t high_neigh_offs;
1189
        uint_fast16_t low_neigh_offs;
1190

    
1191
        low_neigh_offs  = vf->list[i].low;
1192
        high_neigh_offs = vf->list[i].high;
1193
        dy  = floor1_Y_final[high_neigh_offs] - floor1_Y_final[low_neigh_offs];  // render_point begin
1194
        adx = vf->list[high_neigh_offs].x - vf->list[low_neigh_offs].x;
1195
        ady = FFABS(dy);
1196
        err = ady * (vf->list[i].x - vf->list[low_neigh_offs].x);
1197
        off = (int16_t)err / (int16_t)adx;
1198
        if (dy < 0) {
1199
            predicted = floor1_Y_final[low_neigh_offs] - off;
1200
        } else {
1201
            predicted = floor1_Y_final[low_neigh_offs] + off;
1202
        } // render_point end
1203

    
1204
        val = floor1_Y[i];
1205
        highroom = range-predicted;
1206
        lowroom  = predicted;
1207
        if (highroom < lowroom) {
1208
            room = highroom * 2;
1209
        } else {
1210
            room = lowroom * 2;   // SPEC mispelling
1211
        }
1212
        if (val) {
1213
            floor1_flag[low_neigh_offs]  = 1;
1214
            floor1_flag[high_neigh_offs] = 1;
1215
            floor1_flag[i]               = 1;
1216
            if (val >= room) {
1217
                if (highroom > lowroom) {
1218
                    floor1_Y_final[i] = val - lowroom + predicted;
1219
                } else {
1220
                    floor1_Y_final[i] = predicted - val + highroom - 1;
1221
                }
1222
            } else {
1223
                if (val & 1) {
1224
                    floor1_Y_final[i] = predicted - (val + 1) / 2;
1225
                } else {
1226
                    floor1_Y_final[i] = predicted + val / 2;
1227
                }
1228
            }
1229
        } else {
1230
            floor1_flag[i]    = 0;
1231
            floor1_Y_final[i] = predicted;
1232
        }
1233

    
1234
        AV_DEBUG(" Decoded floor(%d) = %d / val %d \n", vf->list[i].x, floor1_Y_final[i], val);
1235
    }
1236

    
1237
// Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?
1238

    
1239
    ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);
1240

    
1241
    AV_DEBUG(" Floor decoded\n");
1242

    
1243
    return 0;
1244
}
1245

    
1246
// Read and decode residue
1247

    
1248
static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc,
1249
                                                           vorbis_residue *vr,
1250
                                                           uint_fast8_t ch,
1251
                                                           uint_fast8_t *do_not_decode,
1252
                                                           float *vec,
1253
                                                           uint_fast16_t vlen,
1254
                                                           int vr_type)
1255
{
1256
    GetBitContext *gb = &vc->gb;
1257
    uint_fast8_t c_p_c = vc->codebooks[vr->classbook].dimensions;
1258
    uint_fast16_t n_to_read = vr->end-vr->begin;
1259
    uint_fast16_t ptns_to_read = n_to_read/vr->partition_size;
1260
    uint_fast8_t classifs[ptns_to_read*vc->audio_channels];
1261
    uint_fast8_t pass;
1262
    uint_fast8_t ch_used;
1263
    uint_fast8_t i,j,l;
1264
    uint_fast16_t k;
1265

    
1266
    if (vr_type == 2) {
1267
        for (j = 1; j < ch; ++j)
1268
            do_not_decode[0] &= do_not_decode[j];  // FIXME - clobbering input
1269
        if (do_not_decode[0])
1270
            return 0;
1271
        ch_used = 1;
1272
    } else {
1273
        ch_used = ch;
1274
    }
1275

    
1276
    AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);
1277

    
1278
    for (pass = 0; pass <= vr->maxpass; ++pass) { // FIXME OPTIMIZE?
1279
        uint_fast16_t voffset;
1280
        uint_fast16_t partition_count;
1281
        uint_fast16_t j_times_ptns_to_read;
1282

    
1283
        voffset = vr->begin;
1284
        for (partition_count = 0; partition_count < ptns_to_read;) {  // SPEC        error
1285
            if (!pass) {
1286
                uint_fast32_t inverse_class = ff_inverse[vr->classifications];
1287
                for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {
1288
                    if (!do_not_decode[j]) {
1289
                        uint_fast32_t temp = get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,
1290
                        vc->codebooks[vr->classbook].nb_bits, 3);
1291

    
1292
                        AV_DEBUG("Classword: %d \n", temp);
1293

    
1294
                        assert(vr->classifications > 1 && temp <= 65536); //needed for inverse[]
1295
                        for (i = 0; i < c_p_c; ++i) {
1296
                            uint_fast32_t temp2;
1297

    
1298
                            temp2 = (((uint_fast64_t)temp) * inverse_class) >> 32;
1299
                            if (partition_count + c_p_c - 1 - i < ptns_to_read)
1300
                                classifs[j_times_ptns_to_read + partition_count + c_p_c - 1 - i] = temp - temp2 * vr->classifications;
1301
                            temp = temp2;
1302
                        }
1303
                    }
1304
                    j_times_ptns_to_read += ptns_to_read;
1305
                }
1306
            }
1307
            for (i = 0; (i < c_p_c) && (partition_count < ptns_to_read); ++i) {
1308
                for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {
1309
                    uint_fast16_t voffs;
1310

    
1311
                    if (!do_not_decode[j]) {
1312
                        uint_fast8_t vqclass = classifs[j_times_ptns_to_read+partition_count];
1313
                        int_fast16_t vqbook = vr->books[vqclass][pass];
1314

    
1315
                        if (vqbook >= 0 && vc->codebooks[vqbook].codevectors) {
1316
                            uint_fast16_t coffs;
1317
                            unsigned dim =  vc->codebooks[vqbook].dimensions; // not uint_fast8_t: 64bit is slower here on amd64
1318
                            uint_fast16_t step = dim == 1 ? vr->partition_size
1319
                                                          : FASTDIV(vr->partition_size, dim);
1320
                            vorbis_codebook codebook = vc->codebooks[vqbook];
1321

    
1322
                            if (vr_type == 0) {
1323

    
1324
                                voffs = voffset+j*vlen;
1325
                                for (k = 0; k < step; ++k) {
1326
                                    coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1327
                                    for (l = 0; l < dim; ++l)
1328
                                        vec[voffs + k + l * step] += codebook.codevectors[coffs + l];  // FPMATH
1329
                                }
1330
                            } else if (vr_type == 1) {
1331
                                voffs = voffset + j * vlen;
1332
                                for (k = 0; k < step; ++k) {
1333
                                    coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1334
                                    for (l = 0; l < dim; ++l, ++voffs) {
1335
                                        vec[voffs]+=codebook.codevectors[coffs+l];  // FPMATH
1336

    
1337
                                        AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d  \n", pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);
1338
                                    }
1339
                                }
1340
                            } else if (vr_type == 2 && ch == 2 && (voffset & 1) == 0 && (dim & 1) == 0) { // most frequent case optimized
1341
                                voffs = voffset >> 1;
1342

    
1343
                                if (dim == 2) {
1344
                                    for (k = 0; k < step; ++k) {
1345
                                        coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;
1346
                                        vec[voffs + k       ] += codebook.codevectors[coffs    ];  // FPMATH
1347
                                        vec[voffs + k + vlen] += codebook.codevectors[coffs + 1];  // FPMATH
1348
                                    }
1349
                                } else if (dim == 4) {
1350
                                    for (k = 0; k < step; ++k, voffs += 2) {
1351
                                        coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4;
1352
                                        vec[voffs           ] += codebook.codevectors[coffs    ];  // FPMATH
1353
                                        vec[voffs + 1       ] += codebook.codevectors[coffs + 2];  // FPMATH
1354
                                        vec[voffs + vlen    ] += codebook.codevectors[coffs + 1];  // FPMATH
1355
                                        vec[voffs + vlen + 1] += codebook.codevectors[coffs + 3];  // FPMATH
1356
                                    }
1357
                                } else
1358
                                for (k = 0; k < step; ++k) {
1359
                                    coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1360
                                    for (l = 0; l < dim; l += 2, voffs++) {
1361
                                        vec[voffs       ] += codebook.codevectors[coffs + l    ];  // FPMATH
1362
                                        vec[voffs + vlen] += codebook.codevectors[coffs + l + 1];  // FPMATH
1363

    
1364
                                        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);
1365
                                    }
1366
                                }
1367

    
1368
                            } else if (vr_type == 2) {
1369
                                voffs = voffset;
1370

    
1371
                                for (k = 0; k < step; ++k) {
1372
                                    coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1373
                                    for (l = 0; l < dim; ++l, ++voffs) {
1374
                                        vec[voffs / ch + (voffs % ch) * vlen] += codebook.codevectors[coffs + l];  // FPMATH FIXME use if and counter instead of / and %
1375

    
1376
                                        AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d+%d  \n", pass, voffset / ch + (voffs % ch) * vlen, vec[voffset / ch + (voffs % ch) * vlen], codebook.codevectors[coffs + l], coffs, l);
1377
                                    }
1378
                                }
1379
                            }
1380
                        }
1381
                    }
1382
                    j_times_ptns_to_read += ptns_to_read;
1383
                }
1384
                ++partition_count;
1385
                voffset += vr->partition_size;
1386
            }
1387
        }
1388
    }
1389
    return 0;
1390
}
1391

    
1392
static inline int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr,
1393
                                        uint_fast8_t ch,
1394
                                        uint_fast8_t *do_not_decode,
1395
                                        float *vec, uint_fast16_t vlen)
1396
{
1397
    if (vr->type == 2)
1398
        return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 2);
1399
    else if (vr->type == 1)
1400
        return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 1);
1401
    else if (vr->type == 0)
1402
        return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 0);
1403
    else {
1404
        av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");
1405
        return -1;
1406
    }
1407
}
1408

    
1409
void vorbis_inverse_coupling(float *mag, float *ang, int blocksize)
1410
{
1411
    int i;
1412
    for (i = 0;  i < blocksize;  i++) {
1413
        if (mag[i] > 0.0) {
1414
            if (ang[i] > 0.0) {
1415
                ang[i] = mag[i] - ang[i];
1416
            } else {
1417
                float temp = ang[i];
1418
                ang[i]     = mag[i];
1419
                mag[i]    += temp;
1420
            }
1421
        } else {
1422
            if (ang[i] > 0.0) {
1423
                ang[i] += mag[i];
1424
            } else {
1425
                float temp = ang[i];
1426
                ang[i]     = mag[i];
1427
                mag[i]    -= temp;
1428
            }
1429
        }
1430
    }
1431
}
1432

    
1433
static void copy_normalize(float *dst, float *src, int len, int exp_bias,
1434
                           float add_bias)
1435
{
1436
    int i;
1437
    if (exp_bias) {
1438
        memcpy(dst, src, len * sizeof(float));
1439
    } else {
1440
        for (i = 0; i < len; i++)
1441
            dst[i] = src[i] + add_bias;
1442
    }
1443
}
1444

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

    
1447
static int vorbis_parse_audio_packet(vorbis_context *vc)
1448
{
1449
    GetBitContext *gb = &vc->gb;
1450

    
1451
    uint_fast8_t previous_window = vc->previous_window;
1452
    uint_fast8_t mode_number;
1453
    uint_fast8_t blockflag;
1454
    uint_fast16_t blocksize;
1455
    int_fast32_t i,j;
1456
    uint_fast8_t no_residue[vc->audio_channels];
1457
    uint_fast8_t do_not_decode[vc->audio_channels];
1458
    vorbis_mapping *mapping;
1459
    float *ch_res_ptr   = vc->channel_residues;
1460
    float *ch_floor_ptr = vc->channel_floors;
1461
    uint_fast8_t res_chan[vc->audio_channels];
1462
    uint_fast8_t res_num = 0;
1463
    int_fast16_t retlen  = 0;
1464
    float fadd_bias = vc->add_bias;
1465

    
1466
    if (get_bits1(gb)) {
1467
        av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");
1468
        return -1; // packet type not audio
1469
    }
1470

    
1471
    if (vc->mode_count == 1) {
1472
        mode_number = 0;
1473
    } else {
1474
        GET_VALIDATED_INDEX(mode_number, ilog(vc->mode_count-1), vc->mode_count)
1475
    }
1476
    vc->mode_number = mode_number;
1477
    mapping = &vc->mappings[vc->modes[mode_number].mapping];
1478

    
1479
    AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);
1480

    
1481
    blockflag = vc->modes[mode_number].blockflag;
1482
    blocksize = vc->blocksize[blockflag];
1483
    if (blockflag)
1484
        skip_bits(gb, 2); // previous_window, next_window
1485

    
1486
    memset(ch_res_ptr,   0, sizeof(float) * vc->audio_channels * blocksize / 2); //FIXME can this be removed ?
1487
    memset(ch_floor_ptr, 0, sizeof(float) * vc->audio_channels * blocksize / 2); //FIXME can this be removed ?
1488

    
1489
// Decode floor
1490

    
1491
    for (i = 0; i < vc->audio_channels; ++i) {
1492
        vorbis_floor *floor;
1493
        if (mapping->submaps > 1) {
1494
            floor = &vc->floors[mapping->submap_floor[mapping->mux[i]]];
1495
        } else {
1496
            floor = &vc->floors[mapping->submap_floor[0]];
1497
        }
1498

    
1499
        no_residue[i] = floor->decode(vc, &floor->data, ch_floor_ptr);
1500
        ch_floor_ptr += blocksize / 2;
1501
    }
1502

    
1503
// Nonzero vector propagate
1504

    
1505
    for (i = mapping->coupling_steps - 1; i >= 0; --i) {
1506
        if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {
1507
            no_residue[mapping->magnitude[i]] = 0;
1508
            no_residue[mapping->angle[i]]     = 0;
1509
        }
1510
    }
1511

    
1512
// Decode residue
1513

    
1514
    for (i = 0; i < mapping->submaps; ++i) {
1515
        vorbis_residue *residue;
1516
        uint_fast8_t ch = 0;
1517

    
1518
        for (j = 0; j < vc->audio_channels; ++j) {
1519
            if ((mapping->submaps == 1) || (i == mapping->mux[j])) {
1520
                res_chan[j] = res_num;
1521
                if (no_residue[j]) {
1522
                    do_not_decode[ch] = 1;
1523
                } else {
1524
                    do_not_decode[ch] = 0;
1525
                }
1526
                ++ch;
1527
                ++res_num;
1528
            }
1529
        }
1530
        residue = &vc->residues[mapping->submap_residue[i]];
1531
        vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);
1532

    
1533
        ch_res_ptr += ch * blocksize / 2;
1534
    }
1535

    
1536
// Inverse coupling
1537

    
1538
    for (i = mapping->coupling_steps - 1; i >= 0; --i) { //warning: i has to be signed
1539
        float *mag, *ang;
1540

    
1541
        mag = vc->channel_residues+res_chan[mapping->magnitude[i]] * blocksize / 2;
1542
        ang = vc->channel_residues+res_chan[mapping->angle[i]]     * blocksize / 2;
1543
        vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize / 2);
1544
    }
1545

    
1546
// Dotproduct, MDCT
1547

    
1548
    for (j = vc->audio_channels-1;j >= 0; j--) {
1549
        ch_floor_ptr = vc->channel_floors   + j           * blocksize / 2;
1550
        ch_res_ptr   = vc->channel_residues + res_chan[j] * blocksize / 2;
1551
        vc->dsp.vector_fmul(ch_floor_ptr, ch_res_ptr, blocksize / 2);
1552
        ff_imdct_half(&vc->mdct[blockflag], ch_res_ptr, ch_floor_ptr);
1553
    }
1554

    
1555
// Overlap/add, save data for next overlapping  FPMATH
1556

    
1557
    retlen = (blocksize + vc->blocksize[previous_window]) / 4;
1558
    for (j = 0; j < vc->audio_channels; j++) {
1559
        uint_fast16_t bs0 = vc->blocksize[0];
1560
        uint_fast16_t bs1 = vc->blocksize[1];
1561
        float *residue    = vc->channel_residues + res_chan[j] * blocksize / 2;
1562
        float *saved      = vc->saved + j * bs1 / 4;
1563
        float *ret        = vc->channel_floors + j * retlen;
1564
        float *buf        = residue;
1565
        const float *win  = vc->win[blockflag & previous_window];
1566

    
1567
        if (blockflag == previous_window) {
1568
            vc->dsp.vector_fmul_window(ret, saved, buf, win, fadd_bias, blocksize / 4);
1569
        } else if (blockflag > previous_window) {
1570
            vc->dsp.vector_fmul_window(ret, saved, buf, win, fadd_bias, bs0 / 4);
1571
            copy_normalize(ret+bs0/2, buf+bs0/4, (bs1-bs0)/4, vc->exp_bias, fadd_bias);
1572
        } else {
1573
            copy_normalize(ret, saved, (bs1 - bs0) / 4, vc->exp_bias, fadd_bias);
1574
            vc->dsp.vector_fmul_window(ret + (bs1 - bs0) / 4, saved + (bs1 - bs0) / 4, buf, win, fadd_bias, bs0 / 4);
1575
        }
1576
        memcpy(saved, buf + blocksize / 4, blocksize / 4 * sizeof(float));
1577
    }
1578

    
1579
    vc->previous_window = blockflag;
1580
    return retlen;
1581
}
1582

    
1583
// Return the decoded audio packet through the standard api
1584

    
1585
static int vorbis_decode_frame(AVCodecContext *avccontext,
1586
                               void *data, int *data_size,
1587
                               AVPacket *avpkt)
1588
{
1589
    const uint8_t *buf = avpkt->data;
1590
    int buf_size       = avpkt->size;
1591
    vorbis_context *vc = avccontext->priv_data ;
1592
    GetBitContext *gb = &(vc->gb);
1593
    const float *channel_ptrs[vc->audio_channels];
1594
    int i;
1595

    
1596
    int_fast16_t len;
1597

    
1598
    if (!buf_size)
1599
        return 0;
1600

    
1601
    AV_DEBUG("packet length %d \n", buf_size);
1602

    
1603
    init_get_bits(gb, buf, buf_size*8);
1604

    
1605
    len = vorbis_parse_audio_packet(vc);
1606

    
1607
    if (len <= 0) {
1608
        *data_size = 0;
1609
        return buf_size;
1610
    }
1611

    
1612
    if (!vc->first_frame) {
1613
        vc->first_frame = 1;
1614
        *data_size = 0;
1615
        return buf_size ;
1616
    }
1617

    
1618
    AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);
1619

    
1620
    if (vc->audio_channels > 8) {
1621
        for (i = 0; i < vc->audio_channels; i++)
1622
            channel_ptrs[i] = vc->channel_floors + i * len;
1623
    } else {
1624
        for (i = 0; i < vc->audio_channels; i++)
1625
            channel_ptrs[i] = vc->channel_floors +
1626
                              len * ff_vorbis_channel_layout_offsets[vc->audio_channels - 1][i];
1627
    }
1628

    
1629
    vc->dsp.float_to_int16_interleave(data, channel_ptrs, len, vc->audio_channels);
1630
    *data_size = len * 2 * vc->audio_channels;
1631

    
1632
    return buf_size ;
1633
}
1634

    
1635
// Close decoder
1636

    
1637
static av_cold int vorbis_decode_close(AVCodecContext *avccontext)
1638
{
1639
    vorbis_context *vc = avccontext->priv_data;
1640

    
1641
    vorbis_free(vc);
1642

    
1643
    return 0 ;
1644
}
1645

    
1646
AVCodec vorbis_decoder = {
1647
    "vorbis",
1648
    AVMEDIA_TYPE_AUDIO,
1649
    CODEC_ID_VORBIS,
1650
    sizeof(vorbis_context),
1651
    vorbis_decode_init,
1652
    NULL,
1653
    vorbis_decode_close,
1654
    vorbis_decode_frame,
1655
    .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),
1656
    .channel_layouts = ff_vorbis_channel_layouts,
1657
};
1658