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ffmpeg / libavcodec / vorbis_dec.c @ 5d6e4c16

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

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

    
27
#include <math.h>
28

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

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

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

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

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

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

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

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

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

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

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

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

    
160
/* Helper functions */
161

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

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

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

    
188

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

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

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

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

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

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

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

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

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

    
235
// Process codebooks part
236

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

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

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

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

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

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

    
262
        if (get_bits(gb, 24) != 0x564342) {
263
            av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook setup data corrupt. \n", cb);
264
            goto error;
265
        }
266

    
267
        codebook_setup->dimensions=get_bits(gb, 16);
268
        if (codebook_setup->dimensions > 16 || codebook_setup->dimensions == 0) {
269
            av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook's dimension is invalid (%d). \n", cb, codebook_setup->dimensions);
270
            goto error;
271
        }
272
        entries = get_bits(gb, 24);
273
        if (entries > V_MAX_VLCS) {
274
            av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook has too many entries (%"PRIdFAST32"). \n", cb, entries);
275
            goto error;
276
        }
277

    
278
        ordered = get_bits1(gb);
279

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    
420
        if (init_vlc(&codebook_setup->vlc, codebook_setup->nb_bits, entries, tmp_vlc_bits, sizeof(*tmp_vlc_bits), sizeof(*tmp_vlc_bits), tmp_vlc_codes, sizeof(*tmp_vlc_codes), sizeof(*tmp_vlc_codes), INIT_VLC_LE)) {
421
            av_log(vc->avccontext, AV_LOG_ERROR, " Error generating vlc tables. \n");
422
            goto error;
423
        }
424
    }
425

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

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

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

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

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

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

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

    
460
// Process floors part
461

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

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

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

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

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

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

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

    
488
            floor_setup->decode = vorbis_floor1_decode;
489

    
490
            floor_setup->data.t1.partitions = get_bits(gb, 5);
491

    
492
            AV_DEBUG(" %d.floor: %d partitions \n", i, floor_setup->data.t1.partitions);
493

    
494
            for (j = 0; j < floor_setup->data.t1.partitions; ++j) {
495
                floor_setup->data.t1.partition_class[j] = get_bits(gb, 4);
496
                if (floor_setup->data.t1.partition_class[j] > maximum_class)
497
                    maximum_class = floor_setup->data.t1.partition_class[j];
498

    
499
                AV_DEBUG(" %d. floor %d partition class %d \n", i, j, floor_setup->data.t1.partition_class[j]);
500

    
501
            }
502

    
503
            AV_DEBUG(" maximum class %d \n", maximum_class);
504

    
505
            for (j = 0; j <= maximum_class; ++j) {
506
                floor_setup->data.t1.class_dimensions[j] = get_bits(gb, 3) + 1;
507
                floor_setup->data.t1.class_subclasses[j] = get_bits(gb, 2);
508

    
509
                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]);
510

    
511
                if (floor_setup->data.t1.class_subclasses[j]) {
512
                    GET_VALIDATED_INDEX(floor_setup->data.t1.class_masterbook[j], 8, vc->codebook_count)
513

    
514
                    AV_DEBUG("   masterbook: %d \n", floor_setup->data.t1.class_masterbook[j]);
515
                }
516

    
517
                for (k = 0; k < (1 << floor_setup->data.t1.class_subclasses[j]); ++k) {
518
                    int16_t bits = get_bits(gb, 8) - 1;
519
                    if (bits != -1)
520
                        VALIDATE_INDEX(bits, vc->codebook_count)
521
                    floor_setup->data.t1.subclass_books[j][k] = bits;
522

    
523
                    AV_DEBUG("    book %d. : %d \n", k, floor_setup->data.t1.subclass_books[j][k]);
524
                }
525
            }
526

    
527
            floor_setup->data.t1.multiplier = get_bits(gb, 2) + 1;
528
            floor_setup->data.t1.x_list_dim = 2;
529

    
530
            for (j = 0; j < floor_setup->data.t1.partitions; ++j)
531
                floor_setup->data.t1.x_list_dim+=floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];
532

    
533
            floor_setup->data.t1.list = av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(vorbis_floor1_entry));
534

    
535

    
536
            rangebits = get_bits(gb, 4);
537
            floor_setup->data.t1.list[0].x = 0;
538
            floor_setup->data.t1.list[1].x = (1 << rangebits);
539

    
540
            for (j = 0; j < floor_setup->data.t1.partitions; ++j) {
541
                for (k = 0; k < floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]]; ++k, ++floor1_values) {
542
                    floor_setup->data.t1.list[floor1_values].x = get_bits(gb, rangebits);
543

    
544
                    AV_DEBUG(" %d. floor1 Y coord. %d \n", floor1_values, floor_setup->data.t1.list[floor1_values].x);
545
                }
546
            }
547

    
548
// Precalculate order of x coordinates - needed for decode
549
            ff_vorbis_ready_floor1_list(floor_setup->data.t1.list, floor_setup->data.t1.x_list_dim);
550
        } else if (floor_setup->floor_type == 0) {
551
            uint_fast8_t max_codebook_dim = 0;
552

    
553
            floor_setup->decode = vorbis_floor0_decode;
554

    
555
            floor_setup->data.t0.order          = get_bits(gb,  8);
556
            floor_setup->data.t0.rate           = get_bits(gb, 16);
557
            floor_setup->data.t0.bark_map_size  = get_bits(gb, 16);
558
            floor_setup->data.t0.amplitude_bits = get_bits(gb,  6);
559
            /* zero would result in a div by zero later *
560
             * 2^0 - 1 == 0                             */
561
            if (floor_setup->data.t0.amplitude_bits == 0) {
562
              av_log(vc->avccontext, AV_LOG_ERROR,
563
                     "Floor 0 amplitude bits is 0.\n");
564
              return -1;
565
            }
566
            floor_setup->data.t0.amplitude_offset = get_bits(gb, 8);
567
            floor_setup->data.t0.num_books        = get_bits(gb, 4) + 1;
568

    
569
            /* allocate mem for booklist */
570
            floor_setup->data.t0.book_list =
571
                av_malloc(floor_setup->data.t0.num_books);
572
            if (!floor_setup->data.t0.book_list)
573
                return -1;
574
            /* read book indexes */
575
            {
576
                int idx;
577
                uint_fast8_t book_idx;
578
                for (idx = 0; idx < floor_setup->data.t0.num_books; ++idx) {
579
                    GET_VALIDATED_INDEX(book_idx, 8, vc->codebook_count)
580
                    floor_setup->data.t0.book_list[idx] = book_idx;
581
                    if (vc->codebooks[book_idx].dimensions > max_codebook_dim)
582
                        max_codebook_dim = vc->codebooks[book_idx].dimensions;
583
                }
584
            }
585

    
586
            create_map(vc, i);
587

    
588
            /* allocate mem for lsp coefficients */
589
            {
590
                /* codebook dim is for padding if codebook dim doesn't *
591
                 * divide order+1 then we need to read more data       */
592
                floor_setup->data.t0.lsp =
593
                    av_malloc((floor_setup->data.t0.order+1 + max_codebook_dim)
594
                              * sizeof(float));
595
                if (!floor_setup->data.t0.lsp)
596
                    return -1;
597
            }
598

    
599
#ifdef V_DEBUG /* debug output parsed headers */
600
            AV_DEBUG("floor0 order: %u\n", floor_setup->data.t0.order);
601
            AV_DEBUG("floor0 rate: %u\n", floor_setup->data.t0.rate);
602
            AV_DEBUG("floor0 bark map size: %u\n",
603
              floor_setup->data.t0.bark_map_size);
604
            AV_DEBUG("floor0 amplitude bits: %u\n",
605
              floor_setup->data.t0.amplitude_bits);
606
            AV_DEBUG("floor0 amplitude offset: %u\n",
607
              floor_setup->data.t0.amplitude_offset);
608
            AV_DEBUG("floor0 number of books: %u\n",
609
              floor_setup->data.t0.num_books);
610
            AV_DEBUG("floor0 book list pointer: %p\n",
611
              floor_setup->data.t0.book_list);
612
            {
613
              int idx;
614
              for (idx = 0; idx < floor_setup->data.t0.num_books; ++idx) {
615
                  AV_DEBUG("  Book %d: %u\n",
616
                           idx+1,
617
                           floor_setup->data.t0.book_list[idx]);
618
              }
619
            }
620
#endif
621
        } else {
622
            av_log(vc->avccontext, AV_LOG_ERROR, "Invalid floor type!\n");
623
            return -1;
624
        }
625
    }
626
    return 0;
627
}
628

    
629
// Process residues part
630

    
631
static int vorbis_parse_setup_hdr_residues(vorbis_context *vc)
632
{
633
    GetBitContext *gb = &vc->gb;
634
    uint_fast8_t i, j, k;
635

    
636
    vc->residue_count = get_bits(gb, 6)+1;
637
    vc->residues      = av_mallocz(vc->residue_count * sizeof(vorbis_residue));
638

    
639
    AV_DEBUG(" There are %d residues. \n", vc->residue_count);
640

    
641
    for (i = 0; i < vc->residue_count; ++i) {
642
        vorbis_residue *res_setup = &vc->residues[i];
643
        uint_fast8_t cascade[64];
644
        uint_fast8_t high_bits;
645
        uint_fast8_t low_bits;
646

    
647
        res_setup->type = get_bits(gb, 16);
648

    
649
        AV_DEBUG(" %d. residue type %d \n", i, res_setup->type);
650

    
651
        res_setup->begin          = get_bits(gb, 24);
652
        res_setup->end            = get_bits(gb, 24);
653
        res_setup->partition_size = get_bits(gb, 24) + 1;
654
        /* Validations to prevent a buffer overflow later. */
655
        if (res_setup->begin>res_setup->end ||
656
            res_setup->end > vc->avccontext->channels * vc->blocksize[1] / (res_setup->type == 2 ? 1 : 2) ||
657
            (res_setup->end-res_setup->begin) / res_setup->partition_size > V_MAX_PARTITIONS) {
658
            av_log(vc->avccontext, AV_LOG_ERROR, "partition out of bounds: type, begin, end, size, blocksize: %"PRIdFAST16", %"PRIdFAST32", %"PRIdFAST32", %u, %"PRIdFAST32"\n", res_setup->type, res_setup->begin, res_setup->end, res_setup->partition_size, vc->blocksize[1] / 2);
659
            return -1;
660
        }
661

    
662
        res_setup->classifications = get_bits(gb, 6) + 1;
663
        GET_VALIDATED_INDEX(res_setup->classbook, 8, vc->codebook_count)
664

    
665
        res_setup->ptns_to_read =
666
            (res_setup->end - res_setup->begin) / res_setup->partition_size;
667
        res_setup->classifs = av_malloc(res_setup->ptns_to_read *
668
                                        vc->audio_channels *
669
                                        sizeof(*res_setup->classifs));
670
        if (!res_setup->classifs)
671
            return AVERROR(ENOMEM);
672

    
673
        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,
674
          res_setup->classifications, res_setup->classbook);
675

    
676
        for (j = 0; j < res_setup->classifications; ++j) {
677
            high_bits = 0;
678
            low_bits  = get_bits(gb, 3);
679
            if (get_bits1(gb))
680
                high_bits = get_bits(gb, 5);
681
            cascade[j] = (high_bits << 3) + low_bits;
682

    
683
            AV_DEBUG("     %d class casscade depth: %d \n", j, ilog(cascade[j]));
684
        }
685

    
686
        res_setup->maxpass = 0;
687
        for (j = 0; j < res_setup->classifications; ++j) {
688
            for (k = 0; k < 8; ++k) {
689
                if (cascade[j]&(1 << k)) {
690
                    GET_VALIDATED_INDEX(res_setup->books[j][k], 8, vc->codebook_count)
691

    
692
                    AV_DEBUG("     %d class casscade depth %d book: %d \n", j, k, res_setup->books[j][k]);
693

    
694
                    if (k>res_setup->maxpass)
695
                        res_setup->maxpass = k;
696
                } else {
697
                    res_setup->books[j][k] = -1;
698
                }
699
            }
700
        }
701
    }
702
    return 0;
703
}
704

    
705
// Process mappings part
706

    
707
static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc)
708
{
709
    GetBitContext *gb = &vc->gb;
710
    uint_fast8_t i, j;
711

    
712
    vc->mapping_count = get_bits(gb, 6)+1;
713
    vc->mappings      = av_mallocz(vc->mapping_count * sizeof(vorbis_mapping));
714

    
715
    AV_DEBUG(" There are %d mappings. \n", vc->mapping_count);
716

    
717
    for (i = 0; i < vc->mapping_count; ++i) {
718
        vorbis_mapping *mapping_setup = &vc->mappings[i];
719

    
720
        if (get_bits(gb, 16)) {
721
            av_log(vc->avccontext, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n");
722
            return -1;
723
        }
724
        if (get_bits1(gb)) {
725
            mapping_setup->submaps = get_bits(gb, 4) + 1;
726
        } else {
727
            mapping_setup->submaps = 1;
728
        }
729

    
730
        if (get_bits1(gb)) {
731
            mapping_setup->coupling_steps = get_bits(gb, 8) + 1;
732
            mapping_setup->magnitude      = av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
733
            mapping_setup->angle          = av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
734
            for (j = 0; j < mapping_setup->coupling_steps; ++j) {
735
                GET_VALIDATED_INDEX(mapping_setup->magnitude[j], ilog(vc->audio_channels - 1), vc->audio_channels)
736
                GET_VALIDATED_INDEX(mapping_setup->angle[j],     ilog(vc->audio_channels - 1), vc->audio_channels)
737
            }
738
        } else {
739
            mapping_setup->coupling_steps = 0;
740
        }
741

    
742
        AV_DEBUG("   %d mapping coupling steps: %d \n", i, mapping_setup->coupling_steps);
743

    
744
        if (get_bits(gb, 2)) {
745
            av_log(vc->avccontext, AV_LOG_ERROR, "%d. mapping setup data invalid. \n", i);
746
            return -1; // following spec.
747
        }
748

    
749
        if (mapping_setup->submaps>1) {
750
            mapping_setup->mux = av_mallocz(vc->audio_channels * sizeof(uint_fast8_t));
751
            for (j = 0; j < vc->audio_channels; ++j)
752
                mapping_setup->mux[j] = get_bits(gb, 4);
753
        }
754

    
755
        for (j = 0; j < mapping_setup->submaps; ++j) {
756
            skip_bits(gb, 8); // FIXME check?
757
            GET_VALIDATED_INDEX(mapping_setup->submap_floor[j],   8, vc->floor_count)
758
            GET_VALIDATED_INDEX(mapping_setup->submap_residue[j], 8, vc->residue_count)
759

    
760
            AV_DEBUG("   %d mapping %d submap : floor %d, residue %d \n", i, j, mapping_setup->submap_floor[j], mapping_setup->submap_residue[j]);
761
        }
762
    }
763
    return 0;
764
}
765

    
766
// Process modes part
767

    
768
static void create_map(vorbis_context *vc, uint_fast8_t floor_number)
769
{
770
    vorbis_floor *floors = vc->floors;
771
    vorbis_floor0 *vf;
772
    int idx;
773
    int_fast8_t blockflag;
774
    int_fast32_t *map;
775
    int_fast32_t n; //TODO: could theoretically be smaller?
776

    
777
    for (blockflag = 0; blockflag < 2; ++blockflag) {
778
        n = vc->blocksize[blockflag] / 2;
779
        floors[floor_number].data.t0.map[blockflag] =
780
            av_malloc((n+1) * sizeof(int_fast32_t)); // n + sentinel
781

    
782
        map =  floors[floor_number].data.t0.map[blockflag];
783
        vf  = &floors[floor_number].data.t0;
784

    
785
        for (idx = 0; idx < n; ++idx) {
786
            map[idx] = floor(BARK((vf->rate * idx) / (2.0f * n)) *
787
                             ((vf->bark_map_size) /
788
                              BARK(vf->rate / 2.0f)));
789
            if (vf->bark_map_size-1 < map[idx])
790
                map[idx] = vf->bark_map_size - 1;
791
        }
792
        map[n] = -1;
793
        vf->map_size[blockflag] = n;
794
    }
795

    
796
#   ifdef V_DEBUG
797
    for (idx = 0; idx <= n; ++idx) {
798
        AV_DEBUG("floor0 map: map at pos %d is %d\n",
799
                 idx, map[idx]);
800
    }
801
#   endif
802
}
803

    
804
static int vorbis_parse_setup_hdr_modes(vorbis_context *vc)
805
{
806
    GetBitContext *gb = &vc->gb;
807
    uint_fast8_t i;
808

    
809
    vc->mode_count = get_bits(gb, 6) + 1;
810
    vc->modes      = av_mallocz(vc->mode_count * sizeof(vorbis_mode));
811

    
812
    AV_DEBUG(" There are %d modes.\n", vc->mode_count);
813

    
814
    for (i = 0; i < vc->mode_count; ++i) {
815
        vorbis_mode *mode_setup = &vc->modes[i];
816

    
817
        mode_setup->blockflag     = get_bits1(gb);
818
        mode_setup->windowtype    = get_bits(gb, 16); //FIXME check
819
        mode_setup->transformtype = get_bits(gb, 16); //FIXME check
820
        GET_VALIDATED_INDEX(mode_setup->mapping, 8, vc->mapping_count);
821

    
822
        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);
823
    }
824
    return 0;
825
}
826

    
827
// Process the whole setup header using the functions above
828

    
829
static int vorbis_parse_setup_hdr(vorbis_context *vc)
830
{
831
    GetBitContext *gb = &vc->gb;
832

    
833
    if ((get_bits(gb, 8) != 'v') || (get_bits(gb, 8) != 'o') ||
834
        (get_bits(gb, 8) != 'r') || (get_bits(gb, 8) != 'b') ||
835
        (get_bits(gb, 8) != 'i') || (get_bits(gb, 8) != 's')) {
836
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n");
837
        return -1;
838
    }
839

    
840
    if (vorbis_parse_setup_hdr_codebooks(vc)) {
841
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n");
842
        return -2;
843
    }
844
    if (vorbis_parse_setup_hdr_tdtransforms(vc)) {
845
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n");
846
        return -3;
847
    }
848
    if (vorbis_parse_setup_hdr_floors(vc)) {
849
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n");
850
        return -4;
851
    }
852
    if (vorbis_parse_setup_hdr_residues(vc)) {
853
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n");
854
        return -5;
855
    }
856
    if (vorbis_parse_setup_hdr_mappings(vc)) {
857
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n");
858
        return -6;
859
    }
860
    if (vorbis_parse_setup_hdr_modes(vc)) {
861
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n");
862
        return -7;
863
    }
864
    if (!get_bits1(gb)) {
865
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n");
866
        return -8; // framing flag bit unset error
867
    }
868

    
869
    return 0;
870
}
871

    
872
// Process the identification header
873

    
874
static int vorbis_parse_id_hdr(vorbis_context *vc)
875
{
876
    GetBitContext *gb = &vc->gb;
877
    uint_fast8_t bl0, bl1;
878

    
879
    if ((get_bits(gb, 8) != 'v') || (get_bits(gb, 8) != 'o') ||
880
        (get_bits(gb, 8) != 'r') || (get_bits(gb, 8) != 'b') ||
881
        (get_bits(gb, 8) != 'i') || (get_bits(gb, 8) != 's')) {
882
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n");
883
        return -1;
884
    }
885

    
886
    vc->version        = get_bits_long(gb, 32);    //FIXME check 0
887
    vc->audio_channels = get_bits(gb, 8);
888
    if (vc->audio_channels <= 0) {
889
        av_log(vc->avccontext, AV_LOG_ERROR, "Invalid number of channels\n");
890
        return -1;
891
    }
892
    vc->audio_samplerate = get_bits_long(gb, 32);
893
    if (vc->audio_samplerate <= 0) {
894
        av_log(vc->avccontext, AV_LOG_ERROR, "Invalid samplerate\n");
895
        return -1;
896
    }
897
    vc->bitrate_maximum = get_bits_long(gb, 32);
898
    vc->bitrate_nominal = get_bits_long(gb, 32);
899
    vc->bitrate_minimum = get_bits_long(gb, 32);
900
    bl0 = get_bits(gb, 4);
901
    bl1 = get_bits(gb, 4);
902
    vc->blocksize[0] = (1 << bl0);
903
    vc->blocksize[1] = (1 << bl1);
904
    if (bl0 > 13 || bl0 < 6 || bl1 > 13 || bl1 < 6 || bl1 < bl0) {
905
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n");
906
        return -3;
907
    }
908
    // output format int16
909
    if (vc->blocksize[1] / 2 * vc->audio_channels * 2 > AVCODEC_MAX_AUDIO_FRAME_SIZE) {
910
        av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis channel count makes "
911
               "output packets too large.\n");
912
        return -4;
913
    }
914
    vc->win[0] = ff_vorbis_vwin[bl0 - 6];
915
    vc->win[1] = ff_vorbis_vwin[bl1 - 6];
916

    
917
    if ((get_bits1(gb)) == 0) {
918
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n");
919
        return -2;
920
    }
921

    
922
    vc->channel_residues =  av_malloc((vc->blocksize[1]  / 2) * vc->audio_channels * sizeof(float));
923
    vc->channel_floors   =  av_malloc((vc->blocksize[1]  / 2) * vc->audio_channels * sizeof(float));
924
    vc->saved            =  av_mallocz((vc->blocksize[1] / 4) * vc->audio_channels * sizeof(float));
925
    vc->previous_window  = 0;
926

    
927
    ff_mdct_init(&vc->mdct[0], bl0, 1, vc->exp_bias ? -(1 << 15) : -1.0);
928
    ff_mdct_init(&vc->mdct[1], bl1, 1, vc->exp_bias ? -(1 << 15) : -1.0);
929

    
930
    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 ",
931
            vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize[0], vc->blocksize[1]);
932

    
933
/*
934
    BLK = vc->blocksize[0];
935
    for (i = 0; i < BLK / 2; ++i) {
936
        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)));
937
    }
938
*/
939

    
940
    return 0;
941
}
942

    
943
// Process the extradata using the functions above (identification header, setup header)
944

    
945
static av_cold int vorbis_decode_init(AVCodecContext *avccontext)
946
{
947
    vorbis_context *vc = avccontext->priv_data ;
948
    uint8_t *headers   = avccontext->extradata;
949
    int headers_len    = avccontext->extradata_size;
950
    uint8_t *header_start[3];
951
    int header_len[3];
952
    GetBitContext *gb = &(vc->gb);
953
    int hdr_type;
954

    
955
    vc->avccontext = avccontext;
956
    dsputil_init(&vc->dsp, avccontext);
957

    
958
    if (vc->dsp.float_to_int16_interleave == ff_float_to_int16_interleave_c) {
959
        vc->add_bias = 385;
960
        vc->exp_bias = 0;
961
    } else {
962
        vc->add_bias = 0;
963
        vc->exp_bias = 15 << 23;
964
    }
965

    
966
    if (!headers_len) {
967
        av_log(avccontext, AV_LOG_ERROR, "Extradata missing.\n");
968
        return -1;
969
    }
970

    
971
    if (ff_split_xiph_headers(headers, headers_len, 30, header_start, header_len) < 0) {
972
        av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
973
        return -1;
974
    }
975

    
976
    init_get_bits(gb, header_start[0], header_len[0]*8);
977
    hdr_type = get_bits(gb, 8);
978
    if (hdr_type != 1) {
979
        av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n");
980
        return -1;
981
    }
982
    if (vorbis_parse_id_hdr(vc)) {
983
        av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n");
984
        vorbis_free(vc);
985
        return -1;
986
    }
987

    
988
    init_get_bits(gb, header_start[2], header_len[2]*8);
989
    hdr_type = get_bits(gb, 8);
990
    if (hdr_type != 5) {
991
        av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");
992
        vorbis_free(vc);
993
        return -1;
994
    }
995
    if (vorbis_parse_setup_hdr(vc)) {
996
        av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");
997
        vorbis_free(vc);
998
        return -1;
999
    }
1000

    
1001
    if (vc->audio_channels > 8)
1002
        avccontext->channel_layout = 0;
1003
    else
1004
        avccontext->channel_layout = ff_vorbis_channel_layouts[vc->audio_channels - 1];
1005

    
1006
    avccontext->channels    = vc->audio_channels;
1007
    avccontext->sample_rate = vc->audio_samplerate;
1008
    avccontext->frame_size  = FFMIN(vc->blocksize[0], vc->blocksize[1]) >> 2;
1009
    avccontext->sample_fmt  = AV_SAMPLE_FMT_S16;
1010

    
1011
    return 0 ;
1012
}
1013

    
1014
// Decode audiopackets -------------------------------------------------
1015

    
1016
// Read and decode floor
1017

    
1018
static int vorbis_floor0_decode(vorbis_context *vc,
1019
                                vorbis_floor_data *vfu, float *vec)
1020
{
1021
    vorbis_floor0 *vf = &vfu->t0;
1022
    float *lsp = vf->lsp;
1023
    uint_fast32_t amplitude;
1024
    uint_fast32_t book_idx;
1025
    uint_fast8_t blockflag = vc->modes[vc->mode_number].blockflag;
1026

    
1027
    amplitude = get_bits(&vc->gb, vf->amplitude_bits);
1028
    if (amplitude > 0) {
1029
        float last = 0;
1030
        uint_fast16_t lsp_len = 0;
1031
        uint_fast16_t idx;
1032
        vorbis_codebook codebook;
1033

    
1034
        book_idx = get_bits(&vc->gb, ilog(vf->num_books));
1035
        if (book_idx >= vf->num_books) {
1036
            av_log(vc->avccontext, AV_LOG_ERROR,
1037
                    "floor0 dec: booknumber too high!\n");
1038
            book_idx =  0;
1039
            //FIXME: look above
1040
        }
1041
        AV_DEBUG("floor0 dec: booknumber: %u\n", book_idx);
1042
        codebook = vc->codebooks[vf->book_list[book_idx]];
1043
        /* Invalid codebook! */
1044
        if (!codebook.codevectors)
1045
            return -1;
1046

    
1047
        while (lsp_len<vf->order) {
1048
            int vec_off;
1049

    
1050
            AV_DEBUG("floor0 dec: book dimension: %d\n", codebook.dimensions);
1051
            AV_DEBUG("floor0 dec: maximum depth: %d\n", codebook.maxdepth);
1052
            /* read temp vector */
1053
            vec_off = get_vlc2(&vc->gb, codebook.vlc.table,
1054
                               codebook.nb_bits, codebook.maxdepth)
1055
                      * codebook.dimensions;
1056
            AV_DEBUG("floor0 dec: vector offset: %d\n", vec_off);
1057
            /* copy each vector component and add last to it */
1058
            for (idx = 0; idx < codebook.dimensions; ++idx)
1059
                lsp[lsp_len+idx] = codebook.codevectors[vec_off+idx] + last;
1060
            last = lsp[lsp_len+idx-1]; /* set last to last vector component */
1061

    
1062
            lsp_len += codebook.dimensions;
1063
        }
1064
#ifdef V_DEBUG
1065
        /* DEBUG: output lsp coeffs */
1066
        {
1067
            int idx;
1068
            for (idx = 0; idx < lsp_len; ++idx)
1069
                AV_DEBUG("floor0 dec: coeff at %d is %f\n", idx, lsp[idx]);
1070
        }
1071
#endif
1072

    
1073
        /* synthesize floor output vector */
1074
        {
1075
            int i;
1076
            int order = vf->order;
1077
            float wstep = M_PI / vf->bark_map_size;
1078

    
1079
            for (i = 0; i < order; i++)
1080
                lsp[i] = 2.0f * cos(lsp[i]);
1081

    
1082
            AV_DEBUG("floor0 synth: map_size = %d; m = %d; wstep = %f\n",
1083
                     vf->map_size, order, wstep);
1084

    
1085
            i = 0;
1086
            while (i < vf->map_size[blockflag]) {
1087
                int j, iter_cond = vf->map[blockflag][i];
1088
                float p = 0.5f;
1089
                float q = 0.5f;
1090
                float two_cos_w = 2.0f * cos(wstep * iter_cond); // needed all times
1091

    
1092
                /* similar part for the q and p products */
1093
                for (j = 0; j + 1 < order; j += 2) {
1094
                    q *= lsp[j]     - two_cos_w;
1095
                    p *= lsp[j + 1] - two_cos_w;
1096
                }
1097
                if (j == order) { // even order
1098
                    p *= p * (2.0f - two_cos_w);
1099
                    q *= q * (2.0f + two_cos_w);
1100
                } else { // odd order
1101
                    q *= two_cos_w-lsp[j]; // one more time for q
1102

    
1103
                    /* final step and square */
1104
                    p *= p * (4.f - two_cos_w * two_cos_w);
1105
                    q *= q;
1106
                }
1107

    
1108
                /* calculate linear floor value */
1109
                {
1110
                    q = exp((((amplitude*vf->amplitude_offset) /
1111
                              (((1 << vf->amplitude_bits) - 1) * sqrt(p + q)))
1112
                             - vf->amplitude_offset) * .11512925f);
1113
                }
1114

    
1115
                /* fill vector */
1116
                do {
1117
                    vec[i] = q; ++i;
1118
                } while (vf->map[blockflag][i] == iter_cond);
1119
            }
1120
        }
1121
    } else {
1122
        /* this channel is unused */
1123
        return 1;
1124
    }
1125

    
1126
    AV_DEBUG(" Floor0 decoded\n");
1127

    
1128
    return 0;
1129
}
1130

    
1131
static int vorbis_floor1_decode(vorbis_context *vc,
1132
                                vorbis_floor_data *vfu, float *vec)
1133
{
1134
    vorbis_floor1 *vf = &vfu->t1;
1135
    GetBitContext *gb = &vc->gb;
1136
    uint_fast16_t range_v[4] = { 256, 128, 86, 64 };
1137
    uint_fast16_t range = range_v[vf->multiplier-1];
1138
    uint_fast16_t floor1_Y[258];
1139
    uint_fast16_t floor1_Y_final[258];
1140
    int floor1_flag[258];
1141
    uint_fast8_t class_;
1142
    uint_fast8_t cdim;
1143
    uint_fast8_t cbits;
1144
    uint_fast8_t csub;
1145
    uint_fast8_t cval;
1146
    int_fast16_t book;
1147
    uint_fast16_t offset;
1148
    uint_fast16_t i,j;
1149
    int_fast16_t adx, ady, dy, off, predicted;
1150
    int_fast32_t err;
1151

    
1152

    
1153
    if (!get_bits1(gb)) // silence
1154
        return 1;
1155

    
1156
// Read values (or differences) for the floor's points
1157

    
1158
    floor1_Y[0] = get_bits(gb, ilog(range - 1));
1159
    floor1_Y[1] = get_bits(gb, ilog(range - 1));
1160

    
1161
    AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);
1162

    
1163
    offset = 2;
1164
    for (i = 0; i < vf->partitions; ++i) {
1165
        class_ = vf->partition_class[i];
1166
        cdim   = vf->class_dimensions[class_];
1167
        cbits  = vf->class_subclasses[class_];
1168
        csub = (1 << cbits) - 1;
1169
        cval = 0;
1170

    
1171
        AV_DEBUG("Cbits %d \n", cbits);
1172

    
1173
        if (cbits) // this reads all subclasses for this partition's class
1174
            cval = get_vlc2(gb, vc->codebooks[vf->class_masterbook[class_]].vlc.table,
1175
                            vc->codebooks[vf->class_masterbook[class_]].nb_bits, 3);
1176

    
1177
        for (j = 0; j < cdim; ++j) {
1178
            book = vf->subclass_books[class_][cval & csub];
1179

    
1180
            AV_DEBUG("book %d Cbits %d cval %d  bits:%d \n", book, cbits, cval, get_bits_count(gb));
1181

    
1182
            cval = cval >> cbits;
1183
            if (book > -1) {
1184
                floor1_Y[offset+j] = get_vlc2(gb, vc->codebooks[book].vlc.table,
1185
                vc->codebooks[book].nb_bits, 3);
1186
            } else {
1187
                floor1_Y[offset+j] = 0;
1188
            }
1189

    
1190
            AV_DEBUG(" floor(%d) = %d \n", vf->list[offset+j].x, floor1_Y[offset+j]);
1191
        }
1192
        offset+=cdim;
1193
    }
1194

    
1195
// Amplitude calculation from the differences
1196

    
1197
    floor1_flag[0] = 1;
1198
    floor1_flag[1] = 1;
1199
    floor1_Y_final[0] = floor1_Y[0];
1200
    floor1_Y_final[1] = floor1_Y[1];
1201

    
1202
    for (i = 2; i < vf->x_list_dim; ++i) {
1203
        uint_fast16_t val, highroom, lowroom, room;
1204
        uint_fast16_t high_neigh_offs;
1205
        uint_fast16_t low_neigh_offs;
1206

    
1207
        low_neigh_offs  = vf->list[i].low;
1208
        high_neigh_offs = vf->list[i].high;
1209
        dy  = floor1_Y_final[high_neigh_offs] - floor1_Y_final[low_neigh_offs];  // render_point begin
1210
        adx = vf->list[high_neigh_offs].x - vf->list[low_neigh_offs].x;
1211
        ady = FFABS(dy);
1212
        err = ady * (vf->list[i].x - vf->list[low_neigh_offs].x);
1213
        off = err / adx;
1214
        if (dy < 0) {
1215
            predicted = floor1_Y_final[low_neigh_offs] - off;
1216
        } else {
1217
            predicted = floor1_Y_final[low_neigh_offs] + off;
1218
        } // render_point end
1219

    
1220
        val = floor1_Y[i];
1221
        highroom = range-predicted;
1222
        lowroom  = predicted;
1223
        if (highroom < lowroom) {
1224
            room = highroom * 2;
1225
        } else {
1226
            room = lowroom * 2;   // SPEC mispelling
1227
        }
1228
        if (val) {
1229
            floor1_flag[low_neigh_offs]  = 1;
1230
            floor1_flag[high_neigh_offs] = 1;
1231
            floor1_flag[i]               = 1;
1232
            if (val >= room) {
1233
                if (highroom > lowroom) {
1234
                    floor1_Y_final[i] = val - lowroom + predicted;
1235
                } else {
1236
                    floor1_Y_final[i] = predicted - val + highroom - 1;
1237
                }
1238
            } else {
1239
                if (val & 1) {
1240
                    floor1_Y_final[i] = predicted - (val + 1) / 2;
1241
                } else {
1242
                    floor1_Y_final[i] = predicted + val / 2;
1243
                }
1244
            }
1245
        } else {
1246
            floor1_flag[i]    = 0;
1247
            floor1_Y_final[i] = predicted;
1248
        }
1249

    
1250
        AV_DEBUG(" Decoded floor(%d) = %d / val %d \n", vf->list[i].x, floor1_Y_final[i], val);
1251
    }
1252

    
1253
// Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?
1254

    
1255
    ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);
1256

    
1257
    AV_DEBUG(" Floor decoded\n");
1258

    
1259
    return 0;
1260
}
1261

    
1262
// Read and decode residue
1263

    
1264
static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc,
1265
                                                           vorbis_residue *vr,
1266
                                                           uint_fast8_t ch,
1267
                                                           uint_fast8_t *do_not_decode,
1268
                                                           float *vec,
1269
                                                           uint_fast16_t vlen,
1270
                                                           int vr_type)
1271
{
1272
    GetBitContext *gb = &vc->gb;
1273
    uint_fast8_t c_p_c = vc->codebooks[vr->classbook].dimensions;
1274
    uint_fast16_t ptns_to_read = vr->ptns_to_read;
1275
    uint8_t *classifs = vr->classifs;
1276
    uint_fast8_t pass;
1277
    uint_fast8_t ch_used;
1278
    uint_fast8_t i,j,l;
1279
    uint_fast16_t k;
1280

    
1281
    if (vr_type == 2) {
1282
        for (j = 1; j < ch; ++j)
1283
            do_not_decode[0] &= do_not_decode[j];  // FIXME - clobbering input
1284
        if (do_not_decode[0])
1285
            return 0;
1286
        ch_used = 1;
1287
    } else {
1288
        ch_used = ch;
1289
    }
1290

    
1291
    AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);
1292

    
1293
    for (pass = 0; pass <= vr->maxpass; ++pass) { // FIXME OPTIMIZE?
1294
        uint_fast16_t voffset;
1295
        uint_fast16_t partition_count;
1296
        uint_fast16_t j_times_ptns_to_read;
1297

    
1298
        voffset = vr->begin;
1299
        for (partition_count = 0; partition_count < ptns_to_read;) {  // SPEC        error
1300
            if (!pass) {
1301
                uint_fast32_t inverse_class = ff_inverse[vr->classifications];
1302
                for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {
1303
                    if (!do_not_decode[j]) {
1304
                        uint_fast32_t temp = get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,
1305
                        vc->codebooks[vr->classbook].nb_bits, 3);
1306

    
1307
                        AV_DEBUG("Classword: %d \n", temp);
1308

    
1309
                        assert(vr->classifications > 1 && temp <= 65536); //needed for inverse[]
1310
                        for (i = 0; i < c_p_c; ++i) {
1311
                            uint_fast32_t temp2;
1312

    
1313
                            temp2 = (((uint_fast64_t)temp) * inverse_class) >> 32;
1314
                            if (partition_count + c_p_c - 1 - i < ptns_to_read)
1315
                                classifs[j_times_ptns_to_read + partition_count + c_p_c - 1 - i] = temp - temp2 * vr->classifications;
1316
                            temp = temp2;
1317
                        }
1318
                    }
1319
                    j_times_ptns_to_read += ptns_to_read;
1320
                }
1321
            }
1322
            for (i = 0; (i < c_p_c) && (partition_count < ptns_to_read); ++i) {
1323
                for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {
1324
                    uint_fast16_t voffs;
1325

    
1326
                    if (!do_not_decode[j]) {
1327
                        uint_fast8_t vqclass = classifs[j_times_ptns_to_read+partition_count];
1328
                        int_fast16_t vqbook = vr->books[vqclass][pass];
1329

    
1330
                        if (vqbook >= 0 && vc->codebooks[vqbook].codevectors) {
1331
                            uint_fast16_t coffs;
1332
                            unsigned dim =  vc->codebooks[vqbook].dimensions; // not uint_fast8_t: 64bit is slower here on amd64
1333
                            uint_fast16_t step = dim == 1 ? vr->partition_size
1334
                                                          : FASTDIV(vr->partition_size, dim);
1335
                            vorbis_codebook codebook = vc->codebooks[vqbook];
1336

    
1337
                            if (vr_type == 0) {
1338

    
1339
                                voffs = voffset+j*vlen;
1340
                                for (k = 0; k < step; ++k) {
1341
                                    coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1342
                                    for (l = 0; l < dim; ++l)
1343
                                        vec[voffs + k + l * step] += codebook.codevectors[coffs + l];  // FPMATH
1344
                                }
1345
                            } else if (vr_type == 1) {
1346
                                voffs = voffset + j * vlen;
1347
                                for (k = 0; k < step; ++k) {
1348
                                    coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1349
                                    for (l = 0; l < dim; ++l, ++voffs) {
1350
                                        vec[voffs]+=codebook.codevectors[coffs+l];  // FPMATH
1351

    
1352
                                        AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d  \n", pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);
1353
                                    }
1354
                                }
1355
                            } else if (vr_type == 2 && ch == 2 && (voffset & 1) == 0 && (dim & 1) == 0) { // most frequent case optimized
1356
                                voffs = voffset >> 1;
1357

    
1358
                                if (dim == 2) {
1359
                                    for (k = 0; k < step; ++k) {
1360
                                        coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;
1361
                                        vec[voffs + k       ] += codebook.codevectors[coffs    ];  // FPMATH
1362
                                        vec[voffs + k + vlen] += codebook.codevectors[coffs + 1];  // FPMATH
1363
                                    }
1364
                                } else if (dim == 4) {
1365
                                    for (k = 0; k < step; ++k, voffs += 2) {
1366
                                        coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4;
1367
                                        vec[voffs           ] += codebook.codevectors[coffs    ];  // FPMATH
1368
                                        vec[voffs + 1       ] += codebook.codevectors[coffs + 2];  // FPMATH
1369
                                        vec[voffs + vlen    ] += codebook.codevectors[coffs + 1];  // FPMATH
1370
                                        vec[voffs + vlen + 1] += codebook.codevectors[coffs + 3];  // FPMATH
1371
                                    }
1372
                                } else
1373
                                for (k = 0; k < step; ++k) {
1374
                                    coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1375
                                    for (l = 0; l < dim; l += 2, voffs++) {
1376
                                        vec[voffs       ] += codebook.codevectors[coffs + l    ];  // FPMATH
1377
                                        vec[voffs + vlen] += codebook.codevectors[coffs + l + 1];  // FPMATH
1378

    
1379
                                        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);
1380
                                    }
1381
                                }
1382

    
1383
                            } else if (vr_type == 2) {
1384
                                voffs = voffset;
1385

    
1386
                                for (k = 0; k < step; ++k) {
1387
                                    coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1388
                                    for (l = 0; l < dim; ++l, ++voffs) {
1389
                                        vec[voffs / ch + (voffs % ch) * vlen] += codebook.codevectors[coffs + l];  // FPMATH FIXME use if and counter instead of / and %
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
                        }
1396
                    }
1397
                    j_times_ptns_to_read += ptns_to_read;
1398
                }
1399
                ++partition_count;
1400
                voffset += vr->partition_size;
1401
            }
1402
        }
1403
    }
1404
    return 0;
1405
}
1406

    
1407
static inline int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr,
1408
                                        uint_fast8_t ch,
1409
                                        uint_fast8_t *do_not_decode,
1410
                                        float *vec, uint_fast16_t vlen)
1411
{
1412
    if (vr->type == 2)
1413
        return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 2);
1414
    else if (vr->type == 1)
1415
        return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 1);
1416
    else if (vr->type == 0)
1417
        return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 0);
1418
    else {
1419
        av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");
1420
        return -1;
1421
    }
1422
}
1423

    
1424
void vorbis_inverse_coupling(float *mag, float *ang, int blocksize)
1425
{
1426
    int i;
1427
    for (i = 0;  i < blocksize;  i++) {
1428
        if (mag[i] > 0.0) {
1429
            if (ang[i] > 0.0) {
1430
                ang[i] = mag[i] - ang[i];
1431
            } else {
1432
                float temp = ang[i];
1433
                ang[i]     = mag[i];
1434
                mag[i]    += temp;
1435
            }
1436
        } else {
1437
            if (ang[i] > 0.0) {
1438
                ang[i] += mag[i];
1439
            } else {
1440
                float temp = ang[i];
1441
                ang[i]     = mag[i];
1442
                mag[i]    -= temp;
1443
            }
1444
        }
1445
    }
1446
}
1447

    
1448
static void copy_normalize(float *dst, float *src, int len, int exp_bias,
1449
                           float add_bias)
1450
{
1451
    int i;
1452
    if (exp_bias) {
1453
        memcpy(dst, src, len * sizeof(float));
1454
    } else {
1455
        for (i = 0; i < len; i++)
1456
            dst[i] = src[i] + add_bias;
1457
    }
1458
}
1459

    
1460
// Decode the audio packet using the functions above
1461

    
1462
static int vorbis_parse_audio_packet(vorbis_context *vc)
1463
{
1464
    GetBitContext *gb = &vc->gb;
1465

    
1466
    uint_fast8_t previous_window = vc->previous_window;
1467
    uint_fast8_t mode_number;
1468
    uint_fast8_t blockflag;
1469
    uint_fast16_t blocksize;
1470
    int_fast32_t i,j;
1471
    uint_fast8_t no_residue[255];
1472
    uint_fast8_t do_not_decode[255];
1473
    vorbis_mapping *mapping;
1474
    float *ch_res_ptr   = vc->channel_residues;
1475
    float *ch_floor_ptr = vc->channel_floors;
1476
    uint_fast8_t res_chan[255];
1477
    uint_fast8_t res_num = 0;
1478
    int_fast16_t retlen  = 0;
1479
    float fadd_bias = vc->add_bias;
1480

    
1481
    if (get_bits1(gb)) {
1482
        av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");
1483
        return -1; // packet type not audio
1484
    }
1485

    
1486
    if (vc->mode_count == 1) {
1487
        mode_number = 0;
1488
    } else {
1489
        GET_VALIDATED_INDEX(mode_number, ilog(vc->mode_count-1), vc->mode_count)
1490
    }
1491
    vc->mode_number = mode_number;
1492
    mapping = &vc->mappings[vc->modes[mode_number].mapping];
1493

    
1494
    AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);
1495

    
1496
    blockflag = vc->modes[mode_number].blockflag;
1497
    blocksize = vc->blocksize[blockflag];
1498
    if (blockflag)
1499
        skip_bits(gb, 2); // previous_window, next_window
1500

    
1501
    memset(ch_res_ptr,   0, sizeof(float) * vc->audio_channels * blocksize / 2); //FIXME can this be removed ?
1502
    memset(ch_floor_ptr, 0, sizeof(float) * vc->audio_channels * blocksize / 2); //FIXME can this be removed ?
1503

    
1504
// Decode floor
1505

    
1506
    for (i = 0; i < vc->audio_channels; ++i) {
1507
        vorbis_floor *floor;
1508
        int ret;
1509
        if (mapping->submaps > 1) {
1510
            floor = &vc->floors[mapping->submap_floor[mapping->mux[i]]];
1511
        } else {
1512
            floor = &vc->floors[mapping->submap_floor[0]];
1513
        }
1514

    
1515
        ret = floor->decode(vc, &floor->data, ch_floor_ptr);
1516

    
1517
        if (ret < 0) {
1518
            av_log(vc->avccontext, AV_LOG_ERROR, "Invalid codebook in vorbis_floor_decode.\n");
1519
            return -1;
1520
        }
1521
        no_residue[i] = ret;
1522
        ch_floor_ptr += blocksize / 2;
1523
    }
1524

    
1525
// Nonzero vector propagate
1526

    
1527
    for (i = mapping->coupling_steps - 1; i >= 0; --i) {
1528
        if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {
1529
            no_residue[mapping->magnitude[i]] = 0;
1530
            no_residue[mapping->angle[i]]     = 0;
1531
        }
1532
    }
1533

    
1534
// Decode residue
1535

    
1536
    for (i = 0; i < mapping->submaps; ++i) {
1537
        vorbis_residue *residue;
1538
        uint_fast8_t ch = 0;
1539

    
1540
        for (j = 0; j < vc->audio_channels; ++j) {
1541
            if ((mapping->submaps == 1) || (i == mapping->mux[j])) {
1542
                res_chan[j] = res_num;
1543
                if (no_residue[j]) {
1544
                    do_not_decode[ch] = 1;
1545
                } else {
1546
                    do_not_decode[ch] = 0;
1547
                }
1548
                ++ch;
1549
                ++res_num;
1550
            }
1551
        }
1552
        residue = &vc->residues[mapping->submap_residue[i]];
1553
        vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);
1554

    
1555
        ch_res_ptr += ch * blocksize / 2;
1556
    }
1557

    
1558
// Inverse coupling
1559

    
1560
    for (i = mapping->coupling_steps - 1; i >= 0; --i) { //warning: i has to be signed
1561
        float *mag, *ang;
1562

    
1563
        mag = vc->channel_residues+res_chan[mapping->magnitude[i]] * blocksize / 2;
1564
        ang = vc->channel_residues+res_chan[mapping->angle[i]]     * blocksize / 2;
1565
        vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize / 2);
1566
    }
1567

    
1568
// Dotproduct, MDCT
1569

    
1570
    for (j = vc->audio_channels-1;j >= 0; j--) {
1571
        ch_floor_ptr = vc->channel_floors   + j           * blocksize / 2;
1572
        ch_res_ptr   = vc->channel_residues + res_chan[j] * blocksize / 2;
1573
        vc->dsp.vector_fmul(ch_floor_ptr, ch_res_ptr, blocksize / 2);
1574
        ff_imdct_half(&vc->mdct[blockflag], ch_res_ptr, ch_floor_ptr);
1575
    }
1576

    
1577
// Overlap/add, save data for next overlapping  FPMATH
1578

    
1579
    retlen = (blocksize + vc->blocksize[previous_window]) / 4;
1580
    for (j = 0; j < vc->audio_channels; j++) {
1581
        uint_fast16_t bs0 = vc->blocksize[0];
1582
        uint_fast16_t bs1 = vc->blocksize[1];
1583
        float *residue    = vc->channel_residues + res_chan[j] * blocksize / 2;
1584
        float *saved      = vc->saved + j * bs1 / 4;
1585
        float *ret        = vc->channel_floors + j * retlen;
1586
        float *buf        = residue;
1587
        const float *win  = vc->win[blockflag & previous_window];
1588

    
1589
        if (blockflag == previous_window) {
1590
            vc->dsp.vector_fmul_window(ret, saved, buf, win, fadd_bias, blocksize / 4);
1591
        } else if (blockflag > previous_window) {
1592
            vc->dsp.vector_fmul_window(ret, saved, buf, win, fadd_bias, bs0 / 4);
1593
            copy_normalize(ret+bs0/2, buf+bs0/4, (bs1-bs0)/4, vc->exp_bias, fadd_bias);
1594
        } else {
1595
            copy_normalize(ret, saved, (bs1 - bs0) / 4, vc->exp_bias, fadd_bias);
1596
            vc->dsp.vector_fmul_window(ret + (bs1 - bs0) / 4, saved + (bs1 - bs0) / 4, buf, win, fadd_bias, bs0 / 4);
1597
        }
1598
        memcpy(saved, buf + blocksize / 4, blocksize / 4 * sizeof(float));
1599
    }
1600

    
1601
    vc->previous_window = blockflag;
1602
    return retlen;
1603
}
1604

    
1605
// Return the decoded audio packet through the standard api
1606

    
1607
static int vorbis_decode_frame(AVCodecContext *avccontext,
1608
                               void *data, int *data_size,
1609
                               AVPacket *avpkt)
1610
{
1611
    const uint8_t *buf = avpkt->data;
1612
    int buf_size       = avpkt->size;
1613
    vorbis_context *vc = avccontext->priv_data ;
1614
    GetBitContext *gb = &(vc->gb);
1615
    const float *channel_ptrs[255];
1616
    int i;
1617

    
1618
    int_fast16_t len;
1619

    
1620
    if (!buf_size)
1621
        return 0;
1622

    
1623
    AV_DEBUG("packet length %d \n", buf_size);
1624

    
1625
    init_get_bits(gb, buf, buf_size*8);
1626

    
1627
    len = vorbis_parse_audio_packet(vc);
1628

    
1629
    if (len <= 0) {
1630
        *data_size = 0;
1631
        return buf_size;
1632
    }
1633

    
1634
    if (!vc->first_frame) {
1635
        vc->first_frame = 1;
1636
        *data_size = 0;
1637
        return buf_size ;
1638
    }
1639

    
1640
    AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);
1641

    
1642
    if (vc->audio_channels > 8) {
1643
        for (i = 0; i < vc->audio_channels; i++)
1644
            channel_ptrs[i] = vc->channel_floors + i * len;
1645
    } else {
1646
        for (i = 0; i < vc->audio_channels; i++)
1647
            channel_ptrs[i] = vc->channel_floors +
1648
                              len * ff_vorbis_channel_layout_offsets[vc->audio_channels - 1][i];
1649
    }
1650

    
1651
    vc->dsp.float_to_int16_interleave(data, channel_ptrs, len, vc->audio_channels);
1652
    *data_size = len * 2 * vc->audio_channels;
1653

    
1654
    return buf_size ;
1655
}
1656

    
1657
// Close decoder
1658

    
1659
static av_cold int vorbis_decode_close(AVCodecContext *avccontext)
1660
{
1661
    vorbis_context *vc = avccontext->priv_data;
1662

    
1663
    vorbis_free(vc);
1664

    
1665
    return 0 ;
1666
}
1667

    
1668
AVCodec vorbis_decoder = {
1669
    "vorbis",
1670
    AVMEDIA_TYPE_AUDIO,
1671
    CODEC_ID_VORBIS,
1672
    sizeof(vorbis_context),
1673
    vorbis_decode_init,
1674
    NULL,
1675
    vorbis_decode_close,
1676
    vorbis_decode_frame,
1677
    .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),
1678
    .channel_layouts = ff_vorbis_channel_layouts,
1679
};
1680