Statistics
| Branch: | Revision:

ffmpeg / libavcodec / vorbis_dec.c @ ba7a2804

History | View | Annotate | Download (60.9 KB)

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
#include "fmtconvert.h"
35

    
36
#include "vorbis.h"
37
#include "xiph.h"
38

    
39
#define V_NB_BITS 8
40
#define V_NB_BITS2 11
41
#define V_MAX_VLCS (1 << 16)
42
#define V_MAX_PARTITIONS (1 << 20)
43

    
44
#ifndef V_DEBUG
45
#define AV_DEBUG(...)
46
#endif
47

    
48
#undef NDEBUG
49
#include <assert.h>
50

    
51
typedef struct {
52
    uint_fast8_t dimensions;
53
    uint_fast8_t lookup_type;
54
    uint_fast8_t maxdepth;
55
    VLC vlc;
56
    float *codevectors;
57
    unsigned int nb_bits;
58
} vorbis_codebook;
59

    
60
typedef union  vorbis_floor_u  vorbis_floor_data;
61
typedef struct vorbis_floor0_s vorbis_floor0;
62
typedef struct vorbis_floor1_s vorbis_floor1;
63
struct vorbis_context_s;
64
typedef
65
int (* vorbis_floor_decode_func)
66
    (struct vorbis_context_s *, vorbis_floor_data *, float *);
67
typedef struct {
68
    uint_fast8_t floor_type;
69
    vorbis_floor_decode_func decode;
70
    union vorbis_floor_u {
71
        struct vorbis_floor0_s {
72
            uint_fast8_t  order;
73
            uint_fast16_t rate;
74
            uint_fast16_t bark_map_size;
75
            int_fast32_t *map[2];
76
            uint_fast32_t map_size[2];
77
            uint_fast8_t  amplitude_bits;
78
            uint_fast8_t  amplitude_offset;
79
            uint_fast8_t  num_books;
80
            uint_fast8_t *book_list;
81
            float        *lsp;
82
        } t0;
83
        struct vorbis_floor1_s {
84
            uint_fast8_t partitions;
85
            uint8_t      partition_class[32];
86
            uint_fast8_t class_dimensions[16];
87
            uint_fast8_t class_subclasses[16];
88
            uint_fast8_t class_masterbook[16];
89
            int_fast16_t subclass_books[16][8];
90
            uint_fast8_t multiplier;
91
            uint_fast16_t x_list_dim;
92
            vorbis_floor1_entry *list;
93
        } t1;
94
    } data;
95
} vorbis_floor;
96

    
97
typedef struct {
98
    uint_fast16_t type;
99
    uint_fast32_t begin;
100
    uint_fast32_t end;
101
    unsigned      partition_size;
102
    uint_fast8_t  classifications;
103
    uint_fast8_t  classbook;
104
    int_fast16_t  books[64][8];
105
    uint_fast8_t  maxpass;
106
    uint_fast16_t ptns_to_read;
107
    uint8_t *classifs;
108
} vorbis_residue;
109

    
110
typedef struct {
111
    uint_fast8_t  submaps;
112
    uint_fast16_t coupling_steps;
113
    uint_fast8_t *magnitude;
114
    uint_fast8_t *angle;
115
    uint_fast8_t *mux;
116
    uint_fast8_t  submap_floor[16];
117
    uint_fast8_t  submap_residue[16];
118
} vorbis_mapping;
119

    
120
typedef struct {
121
    uint_fast8_t  blockflag;
122
    uint_fast16_t windowtype;
123
    uint_fast16_t transformtype;
124
    uint_fast8_t  mapping;
125
} vorbis_mode;
126

    
127
typedef struct vorbis_context_s {
128
    AVCodecContext *avccontext;
129
    GetBitContext gb;
130
    DSPContext dsp;
131
    FmtConvertContext fmt_conv;
132

    
133
    FFTContext mdct[2];
134
    uint_fast8_t  first_frame;
135
    uint_fast32_t version;
136
    uint_fast8_t  audio_channels;
137
    uint_fast32_t audio_samplerate;
138
    uint_fast32_t bitrate_maximum;
139
    uint_fast32_t bitrate_nominal;
140
    uint_fast32_t bitrate_minimum;
141
    uint_fast32_t blocksize[2];
142
    const float  *win[2];
143
    uint_fast16_t codebook_count;
144
    vorbis_codebook *codebooks;
145
    uint_fast8_t  floor_count;
146
    vorbis_floor *floors;
147
    uint_fast8_t  residue_count;
148
    vorbis_residue *residues;
149
    uint_fast8_t  mapping_count;
150
    vorbis_mapping *mappings;
151
    uint_fast8_t  mode_count;
152
    vorbis_mode  *modes;
153
    uint_fast8_t  mode_number; // mode number for the current packet
154
    uint_fast8_t  previous_window;
155
    float        *channel_residues;
156
    float        *channel_floors;
157
    float        *saved;
158
    float         scale_bias; // for float->int conversion
159
} vorbis_context;
160

    
161
/* Helper functions */
162

    
163
#define BARK(x) \
164
    (13.1f * atan(0.00074f * (x)) + 2.24f * atan(1.85e-8f * (x) * (x)) + 1e-4f * (x))
165

    
166
static const char idx_err_str[] = "Index value %d out of range (0 - %d) for %s at %s:%i\n";
167
#define VALIDATE_INDEX(idx, limit) \
168
    if (idx >= limit) {\
169
        av_log(vc->avccontext, AV_LOG_ERROR,\
170
               idx_err_str,\
171
               (int)(idx), (int)(limit - 1), #idx, __FILE__, __LINE__);\
172
        return -1;\
173
    }
174
#define GET_VALIDATED_INDEX(idx, bits, limit) \
175
    {\
176
        idx = get_bits(gb, bits);\
177
        VALIDATE_INDEX(idx, limit)\
178
    }
179

    
180
static float vorbisfloat2float(uint_fast32_t val)
181
{
182
    double mant = val & 0x1fffff;
183
    long exp    = (val & 0x7fe00000L) >> 21;
184
    if (val & 0x80000000)
185
        mant = -mant;
186
    return ldexp(mant, exp - 20 - 768);
187
}
188

    
189

    
190
// Free all allocated memory -----------------------------------------
191

    
192
static void vorbis_free(vorbis_context *vc)
193
{
194
    int_fast16_t i;
195

    
196
    av_freep(&vc->channel_residues);
197
    av_freep(&vc->channel_floors);
198
    av_freep(&vc->saved);
199

    
200
    for (i = 0; i < vc->residue_count; i++)
201
        av_free(vc->residues[i].classifs);
202
    av_freep(&vc->residues);
203
    av_freep(&vc->modes);
204

    
205
    ff_mdct_end(&vc->mdct[0]);
206
    ff_mdct_end(&vc->mdct[1]);
207

    
208
    for (i = 0; i < vc->codebook_count; ++i) {
209
        av_free(vc->codebooks[i].codevectors);
210
        free_vlc(&vc->codebooks[i].vlc);
211
    }
212
    av_freep(&vc->codebooks);
213

    
214
    for (i = 0; i < vc->floor_count; ++i) {
215
        if (vc->floors[i].floor_type == 0) {
216
            av_free(vc->floors[i].data.t0.map[0]);
217
            av_free(vc->floors[i].data.t0.map[1]);
218
            av_free(vc->floors[i].data.t0.book_list);
219
            av_free(vc->floors[i].data.t0.lsp);
220
        } else {
221
            av_free(vc->floors[i].data.t1.list);
222
        }
223
    }
224
    av_freep(&vc->floors);
225

    
226
    for (i = 0; i < vc->mapping_count; ++i) {
227
        av_free(vc->mappings[i].magnitude);
228
        av_free(vc->mappings[i].angle);
229
        av_free(vc->mappings[i].mux);
230
    }
231
    av_freep(&vc->mappings);
232
}
233

    
234
// Parse setup header -------------------------------------------------
235

    
236
// Process codebooks part
237

    
238
static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc)
239
{
240
    uint_fast16_t cb;
241
    uint8_t  *tmp_vlc_bits;
242
    uint32_t *tmp_vlc_codes;
243
    GetBitContext *gb = &vc->gb;
244
    uint_fast16_t *codebook_multiplicands;
245

    
246
    vc->codebook_count = get_bits(gb, 8) + 1;
247

    
248
    AV_DEBUG(" Codebooks: %d \n", vc->codebook_count);
249

    
250
    vc->codebooks = av_mallocz(vc->codebook_count * sizeof(vorbis_codebook));
251
    tmp_vlc_bits  = av_mallocz(V_MAX_VLCS * sizeof(uint8_t));
252
    tmp_vlc_codes = av_mallocz(V_MAX_VLCS * sizeof(uint32_t));
253
    codebook_multiplicands = av_malloc(V_MAX_VLCS * sizeof(*codebook_multiplicands));
254

    
255
    for (cb = 0; cb < vc->codebook_count; ++cb) {
256
        vorbis_codebook *codebook_setup = &vc->codebooks[cb];
257
        uint_fast8_t ordered;
258
        uint_fast32_t t, used_entries = 0;
259
        uint_fast32_t entries;
260

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

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

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

    
279
        ordered = get_bits1(gb);
280

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    
367
                if (tmp_vlc_bits[i]) {
368
                    float last = 0.0;
369
                    uint_fast32_t lookup_offset = i;
370

    
371
#ifdef V_DEBUG
372
                    av_log(vc->avccontext, AV_LOG_INFO, "Lookup offset %d ,", i);
373
#endif
374

    
375
                    for (k = 0; k < dim; ++k) {
376
                        uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values;
377
                        codebook_setup->codevectors[j * dim + k] = codebook_multiplicands[multiplicand_offset] * codebook_delta_value + codebook_minimum_value + last;
378
                        if (codebook_sequence_p)
379
                            last = codebook_setup->codevectors[j * dim + k];
380
                        lookup_offset/=codebook_lookup_values;
381
                    }
382
                    tmp_vlc_bits[j] = tmp_vlc_bits[i];
383

    
384
#ifdef V_DEBUG
385
                    av_log(vc->avccontext, AV_LOG_INFO, "real lookup offset %d, vector: ", j);
386
                    for (k = 0; k < dim; ++k)
387
                        av_log(vc->avccontext, AV_LOG_INFO, " %f ", codebook_setup->codevectors[j * dim + k]);
388
                    av_log(vc->avccontext, AV_LOG_INFO, "\n");
389
#endif
390

    
391
                    ++j;
392
                }
393
            }
394
            if (j != used_entries) {
395
                av_log(vc->avccontext, AV_LOG_ERROR, "Bug in codevector vector building code. \n");
396
                goto error;
397
            }
398
            entries = used_entries;
399
        } else if (codebook_setup->lookup_type >= 2) {
400
            av_log(vc->avccontext, AV_LOG_ERROR, "Codebook lookup type not supported. \n");
401
            goto error;
402
        }
403

    
404
// Initialize VLC table
405
        if (ff_vorbis_len2vlc(tmp_vlc_bits, tmp_vlc_codes, entries)) {
406
            av_log(vc->avccontext, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");
407
            goto error;
408
        }
409
        codebook_setup->maxdepth = 0;
410
        for (t = 0; t < entries; ++t)
411
            if (tmp_vlc_bits[t] >= codebook_setup->maxdepth)
412
                codebook_setup->maxdepth = tmp_vlc_bits[t];
413

    
414
        if (codebook_setup->maxdepth > 3 * V_NB_BITS)
415
            codebook_setup->nb_bits = V_NB_BITS2;
416
        else
417
            codebook_setup->nb_bits = V_NB_BITS;
418

    
419
        codebook_setup->maxdepth = (codebook_setup->maxdepth+codebook_setup->nb_bits - 1) / codebook_setup->nb_bits;
420

    
421
        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)) {
422
            av_log(vc->avccontext, AV_LOG_ERROR, " Error generating vlc tables. \n");
423
            goto error;
424
        }
425
    }
426

    
427
    av_free(tmp_vlc_bits);
428
    av_free(tmp_vlc_codes);
429
    av_free(codebook_multiplicands);
430
    return 0;
431

    
432
// Error:
433
error:
434
    av_free(tmp_vlc_bits);
435
    av_free(tmp_vlc_codes);
436
    av_free(codebook_multiplicands);
437
    return -1;
438
}
439

    
440
// Process time domain transforms part (unused in Vorbis I)
441

    
442
static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc)
443
{
444
    GetBitContext *gb = &vc->gb;
445
    uint_fast8_t i;
446
    uint_fast8_t vorbis_time_count = get_bits(gb, 6) + 1;
447

    
448
    for (i = 0; i < vorbis_time_count; ++i) {
449
        uint_fast16_t vorbis_tdtransform = get_bits(gb, 16);
450

    
451
        AV_DEBUG(" Vorbis time domain transform %d: %d \n", vorbis_time_count, vorbis_tdtransform);
452

    
453
        if (vorbis_tdtransform) {
454
            av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n");
455
            return -1;
456
        }
457
    }
458
    return 0;
459
}
460

    
461
// Process floors part
462

    
463
static int vorbis_floor0_decode(vorbis_context *vc,
464
                                vorbis_floor_data *vfu, float *vec);
465
static void create_map(vorbis_context *vc, uint_fast8_t floor_number);
466
static int vorbis_floor1_decode(vorbis_context *vc,
467
                                vorbis_floor_data *vfu, float *vec);
468
static int vorbis_parse_setup_hdr_floors(vorbis_context *vc)
469
{
470
    GetBitContext *gb = &vc->gb;
471
    int i,j,k;
472

    
473
    vc->floor_count = get_bits(gb, 6) + 1;
474

    
475
    vc->floors = av_mallocz(vc->floor_count * sizeof(vorbis_floor));
476

    
477
    for (i = 0; i < vc->floor_count; ++i) {
478
        vorbis_floor *floor_setup = &vc->floors[i];
479

    
480
        floor_setup->floor_type = get_bits(gb, 16);
481

    
482
        AV_DEBUG(" %d. floor type %d \n", i, floor_setup->floor_type);
483

    
484
        if (floor_setup->floor_type == 1) {
485
            int maximum_class = -1;
486
            uint_fast8_t  rangebits;
487
            uint_fast32_t rangemax;
488
            uint_fast16_t floor1_values = 2;
489

    
490
            floor_setup->decode = vorbis_floor1_decode;
491

    
492
            floor_setup->data.t1.partitions = get_bits(gb, 5);
493

    
494
            AV_DEBUG(" %d.floor: %d partitions \n", i, floor_setup->data.t1.partitions);
495

    
496
            for (j = 0; j < floor_setup->data.t1.partitions; ++j) {
497
                floor_setup->data.t1.partition_class[j] = get_bits(gb, 4);
498
                if (floor_setup->data.t1.partition_class[j] > maximum_class)
499
                    maximum_class = floor_setup->data.t1.partition_class[j];
500

    
501
                AV_DEBUG(" %d. floor %d partition class %d \n", i, j, floor_setup->data.t1.partition_class[j]);
502

    
503
            }
504

    
505
            AV_DEBUG(" maximum class %d \n", maximum_class);
506

    
507
            for (j = 0; j <= maximum_class; ++j) {
508
                floor_setup->data.t1.class_dimensions[j] = get_bits(gb, 3) + 1;
509
                floor_setup->data.t1.class_subclasses[j] = get_bits(gb, 2);
510

    
511
                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]);
512

    
513
                if (floor_setup->data.t1.class_subclasses[j]) {
514
                    GET_VALIDATED_INDEX(floor_setup->data.t1.class_masterbook[j], 8, vc->codebook_count)
515

    
516
                    AV_DEBUG("   masterbook: %d \n", floor_setup->data.t1.class_masterbook[j]);
517
                }
518

    
519
                for (k = 0; k < (1 << floor_setup->data.t1.class_subclasses[j]); ++k) {
520
                    int16_t bits = get_bits(gb, 8) - 1;
521
                    if (bits != -1)
522
                        VALIDATE_INDEX(bits, vc->codebook_count)
523
                    floor_setup->data.t1.subclass_books[j][k] = bits;
524

    
525
                    AV_DEBUG("    book %d. : %d \n", k, floor_setup->data.t1.subclass_books[j][k]);
526
                }
527
            }
528

    
529
            floor_setup->data.t1.multiplier = get_bits(gb, 2) + 1;
530
            floor_setup->data.t1.x_list_dim = 2;
531

    
532
            for (j = 0; j < floor_setup->data.t1.partitions; ++j)
533
                floor_setup->data.t1.x_list_dim+=floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];
534

    
535
            floor_setup->data.t1.list = av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(vorbis_floor1_entry));
536

    
537

    
538
            rangebits = get_bits(gb, 4);
539
            rangemax = (1 << rangebits);
540
            if (rangemax > vc->blocksize[1] / 2) {
541
                av_log(vc->avccontext, AV_LOG_ERROR,
542
                       "Floor value is too large for blocksize: %d (%d)\n",
543
                       rangemax, vc->blocksize[1] / 2);
544
                return -1;
545
            }
546
            floor_setup->data.t1.list[0].x = 0;
547
            floor_setup->data.t1.list[1].x = rangemax;
548

    
549
            for (j = 0; j < floor_setup->data.t1.partitions; ++j) {
550
                for (k = 0; k < floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]]; ++k, ++floor1_values) {
551
                    floor_setup->data.t1.list[floor1_values].x = get_bits(gb, rangebits);
552

    
553
                    AV_DEBUG(" %d. floor1 Y coord. %d \n", floor1_values, floor_setup->data.t1.list[floor1_values].x);
554
                }
555
            }
556

    
557
// Precalculate order of x coordinates - needed for decode
558
            ff_vorbis_ready_floor1_list(floor_setup->data.t1.list, floor_setup->data.t1.x_list_dim);
559
        } else if (floor_setup->floor_type == 0) {
560
            uint_fast8_t max_codebook_dim = 0;
561

    
562
            floor_setup->decode = vorbis_floor0_decode;
563

    
564
            floor_setup->data.t0.order          = get_bits(gb,  8);
565
            floor_setup->data.t0.rate           = get_bits(gb, 16);
566
            floor_setup->data.t0.bark_map_size  = get_bits(gb, 16);
567
            floor_setup->data.t0.amplitude_bits = get_bits(gb,  6);
568
            /* zero would result in a div by zero later *
569
             * 2^0 - 1 == 0                             */
570
            if (floor_setup->data.t0.amplitude_bits == 0) {
571
                av_log(vc->avccontext, AV_LOG_ERROR,
572
                       "Floor 0 amplitude bits is 0.\n");
573
                return -1;
574
            }
575
            floor_setup->data.t0.amplitude_offset = get_bits(gb, 8);
576
            floor_setup->data.t0.num_books        = get_bits(gb, 4) + 1;
577

    
578
            /* allocate mem for booklist */
579
            floor_setup->data.t0.book_list =
580
                av_malloc(floor_setup->data.t0.num_books);
581
            if (!floor_setup->data.t0.book_list)
582
                return -1;
583
            /* read book indexes */
584
            {
585
                int idx;
586
                uint_fast8_t book_idx;
587
                for (idx = 0; idx < floor_setup->data.t0.num_books; ++idx) {
588
                    GET_VALIDATED_INDEX(book_idx, 8, vc->codebook_count)
589
                    floor_setup->data.t0.book_list[idx] = book_idx;
590
                    if (vc->codebooks[book_idx].dimensions > max_codebook_dim)
591
                        max_codebook_dim = vc->codebooks[book_idx].dimensions;
592
                }
593
            }
594

    
595
            create_map(vc, i);
596

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

    
605
#ifdef V_DEBUG /* debug output parsed headers */
606
            AV_DEBUG("floor0 order: %u\n", floor_setup->data.t0.order);
607
            AV_DEBUG("floor0 rate: %u\n", floor_setup->data.t0.rate);
608
            AV_DEBUG("floor0 bark map size: %u\n",
609
                     floor_setup->data.t0.bark_map_size);
610
            AV_DEBUG("floor0 amplitude bits: %u\n",
611
                     floor_setup->data.t0.amplitude_bits);
612
            AV_DEBUG("floor0 amplitude offset: %u\n",
613
                     floor_setup->data.t0.amplitude_offset);
614
            AV_DEBUG("floor0 number of books: %u\n",
615
                     floor_setup->data.t0.num_books);
616
            AV_DEBUG("floor0 book list pointer: %p\n",
617
                     floor_setup->data.t0.book_list);
618
            {
619
                int idx;
620
                for (idx = 0; idx < floor_setup->data.t0.num_books; ++idx) {
621
                    AV_DEBUG("  Book %d: %u\n",
622
                             idx+1,
623
                             floor_setup->data.t0.book_list[idx]);
624
                }
625
            }
626
#endif
627
        } else {
628
            av_log(vc->avccontext, AV_LOG_ERROR, "Invalid floor type!\n");
629
            return -1;
630
        }
631
    }
632
    return 0;
633
}
634

    
635
// Process residues part
636

    
637
static int vorbis_parse_setup_hdr_residues(vorbis_context *vc)
638
{
639
    GetBitContext *gb = &vc->gb;
640
    uint_fast8_t i, j, k;
641

    
642
    vc->residue_count = get_bits(gb, 6)+1;
643
    vc->residues      = av_mallocz(vc->residue_count * sizeof(vorbis_residue));
644

    
645
    AV_DEBUG(" There are %d residues. \n", vc->residue_count);
646

    
647
    for (i = 0; i < vc->residue_count; ++i) {
648
        vorbis_residue *res_setup = &vc->residues[i];
649
        uint_fast8_t cascade[64];
650
        uint_fast8_t high_bits;
651
        uint_fast8_t low_bits;
652

    
653
        res_setup->type = get_bits(gb, 16);
654

    
655
        AV_DEBUG(" %d. residue type %d \n", i, res_setup->type);
656

    
657
        res_setup->begin          = get_bits(gb, 24);
658
        res_setup->end            = get_bits(gb, 24);
659
        res_setup->partition_size = get_bits(gb, 24) + 1;
660
        /* Validations to prevent a buffer overflow later. */
661
        if (res_setup->begin>res_setup->end ||
662
            res_setup->end > vc->avccontext->channels * vc->blocksize[1] / 2 ||
663
            (res_setup->end-res_setup->begin) / res_setup->partition_size > V_MAX_PARTITIONS) {
664
            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);
665
            return -1;
666
        }
667

    
668
        res_setup->classifications = get_bits(gb, 6) + 1;
669
        GET_VALIDATED_INDEX(res_setup->classbook, 8, vc->codebook_count)
670

    
671
        res_setup->ptns_to_read =
672
            (res_setup->end - res_setup->begin) / res_setup->partition_size;
673
        res_setup->classifs = av_malloc(res_setup->ptns_to_read *
674
                                        vc->audio_channels *
675
                                        sizeof(*res_setup->classifs));
676
        if (!res_setup->classifs)
677
            return AVERROR(ENOMEM);
678

    
679
        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,
680
          res_setup->classifications, res_setup->classbook);
681

    
682
        for (j = 0; j < res_setup->classifications; ++j) {
683
            high_bits = 0;
684
            low_bits  = get_bits(gb, 3);
685
            if (get_bits1(gb))
686
                high_bits = get_bits(gb, 5);
687
            cascade[j] = (high_bits << 3) + low_bits;
688

    
689
            AV_DEBUG("     %d class casscade depth: %d \n", j, ilog(cascade[j]));
690
        }
691

    
692
        res_setup->maxpass = 0;
693
        for (j = 0; j < res_setup->classifications; ++j) {
694
            for (k = 0; k < 8; ++k) {
695
                if (cascade[j]&(1 << k)) {
696
                    GET_VALIDATED_INDEX(res_setup->books[j][k], 8, vc->codebook_count)
697

    
698
                    AV_DEBUG("     %d class casscade depth %d book: %d \n", j, k, res_setup->books[j][k]);
699

    
700
                    if (k>res_setup->maxpass)
701
                        res_setup->maxpass = k;
702
                } else {
703
                    res_setup->books[j][k] = -1;
704
                }
705
            }
706
        }
707
    }
708
    return 0;
709
}
710

    
711
// Process mappings part
712

    
713
static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc)
714
{
715
    GetBitContext *gb = &vc->gb;
716
    uint_fast8_t i, j;
717

    
718
    vc->mapping_count = get_bits(gb, 6)+1;
719
    vc->mappings      = av_mallocz(vc->mapping_count * sizeof(vorbis_mapping));
720

    
721
    AV_DEBUG(" There are %d mappings. \n", vc->mapping_count);
722

    
723
    for (i = 0; i < vc->mapping_count; ++i) {
724
        vorbis_mapping *mapping_setup = &vc->mappings[i];
725

    
726
        if (get_bits(gb, 16)) {
727
            av_log(vc->avccontext, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n");
728
            return -1;
729
        }
730
        if (get_bits1(gb)) {
731
            mapping_setup->submaps = get_bits(gb, 4) + 1;
732
        } else {
733
            mapping_setup->submaps = 1;
734
        }
735

    
736
        if (get_bits1(gb)) {
737
            mapping_setup->coupling_steps = get_bits(gb, 8) + 1;
738
            mapping_setup->magnitude      = av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
739
            mapping_setup->angle          = av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
740
            for (j = 0; j < mapping_setup->coupling_steps; ++j) {
741
                GET_VALIDATED_INDEX(mapping_setup->magnitude[j], ilog(vc->audio_channels - 1), vc->audio_channels)
742
                GET_VALIDATED_INDEX(mapping_setup->angle[j],     ilog(vc->audio_channels - 1), vc->audio_channels)
743
            }
744
        } else {
745
            mapping_setup->coupling_steps = 0;
746
        }
747

    
748
        AV_DEBUG("   %d mapping coupling steps: %d \n", i, mapping_setup->coupling_steps);
749

    
750
        if (get_bits(gb, 2)) {
751
            av_log(vc->avccontext, AV_LOG_ERROR, "%d. mapping setup data invalid. \n", i);
752
            return -1; // following spec.
753
        }
754

    
755
        if (mapping_setup->submaps>1) {
756
            mapping_setup->mux = av_mallocz(vc->audio_channels * sizeof(uint_fast8_t));
757
            for (j = 0; j < vc->audio_channels; ++j)
758
                mapping_setup->mux[j] = get_bits(gb, 4);
759
        }
760

    
761
        for (j = 0; j < mapping_setup->submaps; ++j) {
762
            skip_bits(gb, 8); // FIXME check?
763
            GET_VALIDATED_INDEX(mapping_setup->submap_floor[j],   8, vc->floor_count)
764
            GET_VALIDATED_INDEX(mapping_setup->submap_residue[j], 8, vc->residue_count)
765

    
766
            AV_DEBUG("   %d mapping %d submap : floor %d, residue %d \n", i, j, mapping_setup->submap_floor[j], mapping_setup->submap_residue[j]);
767
        }
768
    }
769
    return 0;
770
}
771

    
772
// Process modes part
773

    
774
static void create_map(vorbis_context *vc, uint_fast8_t floor_number)
775
{
776
    vorbis_floor *floors = vc->floors;
777
    vorbis_floor0 *vf;
778
    int idx;
779
    int_fast8_t blockflag;
780
    int_fast32_t *map;
781
    int_fast32_t n; //TODO: could theoretically be smaller?
782

    
783
    for (blockflag = 0; blockflag < 2; ++blockflag) {
784
        n = vc->blocksize[blockflag] / 2;
785
        floors[floor_number].data.t0.map[blockflag] =
786
            av_malloc((n+1) * sizeof(int_fast32_t)); // n + sentinel
787

    
788
        map =  floors[floor_number].data.t0.map[blockflag];
789
        vf  = &floors[floor_number].data.t0;
790

    
791
        for (idx = 0; idx < n; ++idx) {
792
            map[idx] = floor(BARK((vf->rate * idx) / (2.0f * n)) *
793
                             ((vf->bark_map_size) /
794
                              BARK(vf->rate / 2.0f)));
795
            if (vf->bark_map_size-1 < map[idx])
796
                map[idx] = vf->bark_map_size - 1;
797
        }
798
        map[n] = -1;
799
        vf->map_size[blockflag] = n;
800
    }
801

    
802
#ifdef V_DEBUG
803
    for (idx = 0; idx <= n; ++idx) {
804
        AV_DEBUG("floor0 map: map at pos %d is %d\n",
805
                 idx, map[idx]);
806
    }
807
#endif
808
}
809

    
810
static int vorbis_parse_setup_hdr_modes(vorbis_context *vc)
811
{
812
    GetBitContext *gb = &vc->gb;
813
    uint_fast8_t i;
814

    
815
    vc->mode_count = get_bits(gb, 6) + 1;
816
    vc->modes      = av_mallocz(vc->mode_count * sizeof(vorbis_mode));
817

    
818
    AV_DEBUG(" There are %d modes.\n", vc->mode_count);
819

    
820
    for (i = 0; i < vc->mode_count; ++i) {
821
        vorbis_mode *mode_setup = &vc->modes[i];
822

    
823
        mode_setup->blockflag     = get_bits1(gb);
824
        mode_setup->windowtype    = get_bits(gb, 16); //FIXME check
825
        mode_setup->transformtype = get_bits(gb, 16); //FIXME check
826
        GET_VALIDATED_INDEX(mode_setup->mapping, 8, vc->mapping_count);
827

    
828
        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);
829
    }
830
    return 0;
831
}
832

    
833
// Process the whole setup header using the functions above
834

    
835
static int vorbis_parse_setup_hdr(vorbis_context *vc)
836
{
837
    GetBitContext *gb = &vc->gb;
838

    
839
    if ((get_bits(gb, 8) != 'v') || (get_bits(gb, 8) != 'o') ||
840
        (get_bits(gb, 8) != 'r') || (get_bits(gb, 8) != 'b') ||
841
        (get_bits(gb, 8) != 'i') || (get_bits(gb, 8) != 's')) {
842
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n");
843
        return -1;
844
    }
845

    
846
    if (vorbis_parse_setup_hdr_codebooks(vc)) {
847
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n");
848
        return -2;
849
    }
850
    if (vorbis_parse_setup_hdr_tdtransforms(vc)) {
851
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n");
852
        return -3;
853
    }
854
    if (vorbis_parse_setup_hdr_floors(vc)) {
855
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n");
856
        return -4;
857
    }
858
    if (vorbis_parse_setup_hdr_residues(vc)) {
859
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n");
860
        return -5;
861
    }
862
    if (vorbis_parse_setup_hdr_mappings(vc)) {
863
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n");
864
        return -6;
865
    }
866
    if (vorbis_parse_setup_hdr_modes(vc)) {
867
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n");
868
        return -7;
869
    }
870
    if (!get_bits1(gb)) {
871
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n");
872
        return -8; // framing flag bit unset error
873
    }
874

    
875
    return 0;
876
}
877

    
878
// Process the identification header
879

    
880
static int vorbis_parse_id_hdr(vorbis_context *vc)
881
{
882
    GetBitContext *gb = &vc->gb;
883
    uint_fast8_t bl0, bl1;
884

    
885
    if ((get_bits(gb, 8) != 'v') || (get_bits(gb, 8) != 'o') ||
886
        (get_bits(gb, 8) != 'r') || (get_bits(gb, 8) != 'b') ||
887
        (get_bits(gb, 8) != 'i') || (get_bits(gb, 8) != 's')) {
888
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n");
889
        return -1;
890
    }
891

    
892
    vc->version        = get_bits_long(gb, 32);    //FIXME check 0
893
    vc->audio_channels = get_bits(gb, 8);
894
    if (vc->audio_channels <= 0) {
895
        av_log(vc->avccontext, AV_LOG_ERROR, "Invalid number of channels\n");
896
        return -1;
897
    }
898
    vc->audio_samplerate = get_bits_long(gb, 32);
899
    if (vc->audio_samplerate <= 0) {
900
        av_log(vc->avccontext, AV_LOG_ERROR, "Invalid samplerate\n");
901
        return -1;
902
    }
903
    vc->bitrate_maximum = get_bits_long(gb, 32);
904
    vc->bitrate_nominal = get_bits_long(gb, 32);
905
    vc->bitrate_minimum = get_bits_long(gb, 32);
906
    bl0 = get_bits(gb, 4);
907
    bl1 = get_bits(gb, 4);
908
    vc->blocksize[0] = (1 << bl0);
909
    vc->blocksize[1] = (1 << bl1);
910
    if (bl0 > 13 || bl0 < 6 || bl1 > 13 || bl1 < 6 || bl1 < bl0) {
911
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n");
912
        return -3;
913
    }
914
    // output format int16
915
    if (vc->blocksize[1] / 2 * vc->audio_channels * 2 > AVCODEC_MAX_AUDIO_FRAME_SIZE) {
916
        av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis channel count makes "
917
               "output packets too large.\n");
918
        return -4;
919
    }
920
    vc->win[0] = ff_vorbis_vwin[bl0 - 6];
921
    vc->win[1] = ff_vorbis_vwin[bl1 - 6];
922

    
923
    if ((get_bits1(gb)) == 0) {
924
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n");
925
        return -2;
926
    }
927

    
928
    vc->channel_residues =  av_malloc((vc->blocksize[1]  / 2) * vc->audio_channels * sizeof(float));
929
    vc->channel_floors   =  av_malloc((vc->blocksize[1]  / 2) * vc->audio_channels * sizeof(float));
930
    vc->saved            =  av_mallocz((vc->blocksize[1] / 4) * vc->audio_channels * sizeof(float));
931
    vc->previous_window  = 0;
932

    
933
    ff_mdct_init(&vc->mdct[0], bl0, 1, -vc->scale_bias);
934
    ff_mdct_init(&vc->mdct[1], bl1, 1, -vc->scale_bias);
935

    
936
    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 ",
937
            vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize[0], vc->blocksize[1]);
938

    
939
/*
940
    BLK = vc->blocksize[0];
941
    for (i = 0; i < BLK / 2; ++i) {
942
        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)));
943
    }
944
*/
945

    
946
    return 0;
947
}
948

    
949
// Process the extradata using the functions above (identification header, setup header)
950

    
951
static av_cold int vorbis_decode_init(AVCodecContext *avccontext)
952
{
953
    vorbis_context *vc = avccontext->priv_data ;
954
    uint8_t *headers   = avccontext->extradata;
955
    int headers_len    = avccontext->extradata_size;
956
    uint8_t *header_start[3];
957
    int header_len[3];
958
    GetBitContext *gb = &(vc->gb);
959
    int hdr_type;
960

    
961
    vc->avccontext = avccontext;
962
    dsputil_init(&vc->dsp, avccontext);
963
    ff_fmt_convert_init(&vc->fmt_conv, avccontext);
964

    
965
    vc->scale_bias = 32768.0f;
966

    
967
    if (!headers_len) {
968
        av_log(avccontext, AV_LOG_ERROR, "Extradata missing.\n");
969
        return -1;
970
    }
971

    
972
    if (ff_split_xiph_headers(headers, headers_len, 30, header_start, header_len) < 0) {
973
        av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
974
        return -1;
975
    }
976

    
977
    init_get_bits(gb, header_start[0], header_len[0]*8);
978
    hdr_type = get_bits(gb, 8);
979
    if (hdr_type != 1) {
980
        av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n");
981
        return -1;
982
    }
983
    if (vorbis_parse_id_hdr(vc)) {
984
        av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n");
985
        vorbis_free(vc);
986
        return -1;
987
    }
988

    
989
    init_get_bits(gb, header_start[2], header_len[2]*8);
990
    hdr_type = get_bits(gb, 8);
991
    if (hdr_type != 5) {
992
        av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");
993
        vorbis_free(vc);
994
        return -1;
995
    }
996
    if (vorbis_parse_setup_hdr(vc)) {
997
        av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");
998
        vorbis_free(vc);
999
        return -1;
1000
    }
1001

    
1002
    if (vc->audio_channels > 8)
1003
        avccontext->channel_layout = 0;
1004
    else
1005
        avccontext->channel_layout = ff_vorbis_channel_layouts[vc->audio_channels - 1];
1006

    
1007
    avccontext->channels    = vc->audio_channels;
1008
    avccontext->sample_rate = vc->audio_samplerate;
1009
    avccontext->frame_size  = FFMIN(vc->blocksize[0], vc->blocksize[1]) >> 2;
1010
    /* ffdshow custom code */
1011
#if CONFIG_AUDIO_FLOAT
1012
    avccontext->sample_fmt  = AV_SAMPLE_FMT_FLT;
1013
#else
1014
    avccontext->sample_fmt  = AV_SAMPLE_FMT_S16;
1015
#endif
1016

    
1017
    return 0 ;
1018
}
1019

    
1020
// Decode audiopackets -------------------------------------------------
1021

    
1022
// Read and decode floor
1023

    
1024
static int vorbis_floor0_decode(vorbis_context *vc,
1025
                                vorbis_floor_data *vfu, float *vec)
1026
{
1027
    vorbis_floor0 *vf = &vfu->t0;
1028
    float *lsp = vf->lsp;
1029
    uint_fast32_t amplitude;
1030
    uint_fast32_t book_idx;
1031
    uint_fast8_t blockflag = vc->modes[vc->mode_number].blockflag;
1032

    
1033
    amplitude = get_bits(&vc->gb, vf->amplitude_bits);
1034
    if (amplitude > 0) {
1035
        float last = 0;
1036
        uint_fast16_t lsp_len = 0;
1037
        uint_fast16_t idx;
1038
        vorbis_codebook codebook;
1039

    
1040
        book_idx = get_bits(&vc->gb, ilog(vf->num_books));
1041
        if (book_idx >= vf->num_books) {
1042
            av_log(vc->avccontext, AV_LOG_ERROR,
1043
                    "floor0 dec: booknumber too high!\n");
1044
            book_idx =  0;
1045
        }
1046
        AV_DEBUG("floor0 dec: booknumber: %u\n", book_idx);
1047
        codebook = vc->codebooks[vf->book_list[book_idx]];
1048
        /* Invalid codebook! */
1049
        if (!codebook.codevectors)
1050
            return -1;
1051

    
1052
        while (lsp_len<vf->order) {
1053
            int vec_off;
1054

    
1055
            AV_DEBUG("floor0 dec: book dimension: %d\n", codebook.dimensions);
1056
            AV_DEBUG("floor0 dec: maximum depth: %d\n", codebook.maxdepth);
1057
            /* read temp vector */
1058
            vec_off = get_vlc2(&vc->gb, codebook.vlc.table,
1059
                               codebook.nb_bits, codebook.maxdepth)
1060
                      * codebook.dimensions;
1061
            AV_DEBUG("floor0 dec: vector offset: %d\n", vec_off);
1062
            /* copy each vector component and add last to it */
1063
            for (idx = 0; idx < codebook.dimensions; ++idx)
1064
                lsp[lsp_len+idx] = codebook.codevectors[vec_off+idx] + last;
1065
            last = lsp[lsp_len+idx-1]; /* set last to last vector component */
1066

    
1067
            lsp_len += codebook.dimensions;
1068
        }
1069
#ifdef V_DEBUG
1070
        /* DEBUG: output lsp coeffs */
1071
        {
1072
            int idx;
1073
            for (idx = 0; idx < lsp_len; ++idx)
1074
                AV_DEBUG("floor0 dec: coeff at %d is %f\n", idx, lsp[idx]);
1075
        }
1076
#endif
1077

    
1078
        /* synthesize floor output vector */
1079
        {
1080
            int i;
1081
            int order = vf->order;
1082
            float wstep = M_PI / vf->bark_map_size;
1083

    
1084
            for (i = 0; i < order; i++)
1085
                lsp[i] = 2.0f * cos(lsp[i]);
1086

    
1087
            AV_DEBUG("floor0 synth: map_size = %d; m = %d; wstep = %f\n",
1088
                     vf->map_size, order, wstep);
1089

    
1090
            i = 0;
1091
            while (i < vf->map_size[blockflag]) {
1092
                int j, iter_cond = vf->map[blockflag][i];
1093
                float p = 0.5f;
1094
                float q = 0.5f;
1095
                float two_cos_w = 2.0f * cos(wstep * iter_cond); // needed all times
1096

    
1097
                /* similar part for the q and p products */
1098
                for (j = 0; j + 1 < order; j += 2) {
1099
                    q *= lsp[j]     - two_cos_w;
1100
                    p *= lsp[j + 1] - two_cos_w;
1101
                }
1102
                if (j == order) { // even order
1103
                    p *= p * (2.0f - two_cos_w);
1104
                    q *= q * (2.0f + two_cos_w);
1105
                } else { // odd order
1106
                    q *= two_cos_w-lsp[j]; // one more time for q
1107

    
1108
                    /* final step and square */
1109
                    p *= p * (4.f - two_cos_w * two_cos_w);
1110
                    q *= q;
1111
                }
1112

    
1113
                /* calculate linear floor value */
1114
                q = exp((((amplitude*vf->amplitude_offset) /
1115
                          (((1 << vf->amplitude_bits) - 1) * sqrt(p + q)))
1116
                         - vf->amplitude_offset) * .11512925f);
1117

    
1118
                /* fill vector */
1119
                do {
1120
                    vec[i] = q; ++i;
1121
                } while (vf->map[blockflag][i] == iter_cond);
1122
            }
1123
        }
1124
    } else {
1125
        /* this channel is unused */
1126
        return 1;
1127
    }
1128

    
1129
    AV_DEBUG(" Floor0 decoded\n");
1130

    
1131
    return 0;
1132
}
1133

    
1134
static int vorbis_floor1_decode(vorbis_context *vc,
1135
                                vorbis_floor_data *vfu, float *vec)
1136
{
1137
    vorbis_floor1 *vf = &vfu->t1;
1138
    GetBitContext *gb = &vc->gb;
1139
    uint_fast16_t range_v[4] = { 256, 128, 86, 64 };
1140
    uint_fast16_t range = range_v[vf->multiplier-1];
1141
    uint_fast16_t floor1_Y[258];
1142
    uint_fast16_t floor1_Y_final[258];
1143
    int floor1_flag[258];
1144
    uint_fast8_t class_;
1145
    uint_fast8_t cdim;
1146
    uint_fast8_t cbits;
1147
    uint_fast8_t csub;
1148
    uint_fast8_t cval;
1149
    int_fast16_t book;
1150
    uint_fast16_t offset;
1151
    uint_fast16_t i,j;
1152
    int_fast16_t adx, ady, dy, off, predicted;
1153
    int_fast32_t err;
1154

    
1155

    
1156
    if (!get_bits1(gb)) // silence
1157
        return 1;
1158

    
1159
// Read values (or differences) for the floor's points
1160

    
1161
    floor1_Y[0] = get_bits(gb, ilog(range - 1));
1162
    floor1_Y[1] = get_bits(gb, ilog(range - 1));
1163

    
1164
    AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);
1165

    
1166
    offset = 2;
1167
    for (i = 0; i < vf->partitions; ++i) {
1168
        class_ = vf->partition_class[i];
1169
        cdim   = vf->class_dimensions[class_];
1170
        cbits  = vf->class_subclasses[class_];
1171
        csub = (1 << cbits) - 1;
1172
        cval = 0;
1173

    
1174
        AV_DEBUG("Cbits %d \n", cbits);
1175

    
1176
        if (cbits) // this reads all subclasses for this partition's class
1177
            cval = get_vlc2(gb, vc->codebooks[vf->class_masterbook[class_]].vlc.table,
1178
                            vc->codebooks[vf->class_masterbook[class_]].nb_bits, 3);
1179

    
1180
        for (j = 0; j < cdim; ++j) {
1181
            book = vf->subclass_books[class_][cval & csub];
1182

    
1183
            AV_DEBUG("book %d Cbits %d cval %d  bits:%d \n", book, cbits, cval, get_bits_count(gb));
1184

    
1185
            cval = cval >> cbits;
1186
            if (book > -1) {
1187
                floor1_Y[offset+j] = get_vlc2(gb, vc->codebooks[book].vlc.table,
1188
                vc->codebooks[book].nb_bits, 3);
1189
            } else {
1190
                floor1_Y[offset+j] = 0;
1191
            }
1192

    
1193
            AV_DEBUG(" floor(%d) = %d \n", vf->list[offset+j].x, floor1_Y[offset+j]);
1194
        }
1195
        offset+=cdim;
1196
    }
1197

    
1198
// Amplitude calculation from the differences
1199

    
1200
    floor1_flag[0] = 1;
1201
    floor1_flag[1] = 1;
1202
    floor1_Y_final[0] = floor1_Y[0];
1203
    floor1_Y_final[1] = floor1_Y[1];
1204

    
1205
    for (i = 2; i < vf->x_list_dim; ++i) {
1206
        uint_fast16_t val, highroom, lowroom, room;
1207
        uint_fast16_t high_neigh_offs;
1208
        uint_fast16_t low_neigh_offs;
1209

    
1210
        low_neigh_offs  = vf->list[i].low;
1211
        high_neigh_offs = vf->list[i].high;
1212
        dy  = floor1_Y_final[high_neigh_offs] - floor1_Y_final[low_neigh_offs];  // render_point begin
1213
        adx = vf->list[high_neigh_offs].x - vf->list[low_neigh_offs].x;
1214
        ady = FFABS(dy);
1215
        err = ady * (vf->list[i].x - vf->list[low_neigh_offs].x);
1216
        off = err / adx;
1217
        if (dy < 0) {
1218
            predicted = floor1_Y_final[low_neigh_offs] - off;
1219
        } else {
1220
            predicted = floor1_Y_final[low_neigh_offs] + off;
1221
        } // render_point end
1222

    
1223
        val = floor1_Y[i];
1224
        highroom = range-predicted;
1225
        lowroom  = predicted;
1226
        if (highroom < lowroom) {
1227
            room = highroom * 2;
1228
        } else {
1229
            room = lowroom * 2;   // SPEC mispelling
1230
        }
1231
        if (val) {
1232
            floor1_flag[low_neigh_offs]  = 1;
1233
            floor1_flag[high_neigh_offs] = 1;
1234
            floor1_flag[i]               = 1;
1235
            if (val >= room) {
1236
                if (highroom > lowroom) {
1237
                    floor1_Y_final[i] = val - lowroom + predicted;
1238
                } else {
1239
                    floor1_Y_final[i] = predicted - val + highroom - 1;
1240
                }
1241
            } else {
1242
                if (val & 1) {
1243
                    floor1_Y_final[i] = predicted - (val + 1) / 2;
1244
                } else {
1245
                    floor1_Y_final[i] = predicted + val / 2;
1246
                }
1247
            }
1248
        } else {
1249
            floor1_flag[i]    = 0;
1250
            floor1_Y_final[i] = predicted;
1251
        }
1252

    
1253
        AV_DEBUG(" Decoded floor(%d) = %d / val %d \n", vf->list[i].x, floor1_Y_final[i], val);
1254
    }
1255

    
1256
// Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?
1257

    
1258
    ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);
1259

    
1260
    AV_DEBUG(" Floor decoded\n");
1261

    
1262
    return 0;
1263
}
1264

    
1265
// Read and decode residue
1266

    
1267
static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc,
1268
                                                           vorbis_residue *vr,
1269
                                                           uint_fast8_t ch,
1270
                                                           uint_fast8_t *do_not_decode,
1271
                                                           float *vec,
1272
                                                           uint_fast16_t vlen,
1273
                                                           int vr_type)
1274
{
1275
    GetBitContext *gb = &vc->gb;
1276
    uint_fast8_t c_p_c = vc->codebooks[vr->classbook].dimensions;
1277
    uint_fast16_t ptns_to_read = vr->ptns_to_read;
1278
    uint8_t *classifs = vr->classifs;
1279
    uint_fast8_t pass;
1280
    uint_fast8_t ch_used;
1281
    uint_fast8_t i,j,l;
1282
    uint_fast16_t k;
1283

    
1284
    if (vr_type == 2) {
1285
        for (j = 1; j < ch; ++j)
1286
            do_not_decode[0] &= do_not_decode[j];  // FIXME - clobbering input
1287
        if (do_not_decode[0])
1288
            return 0;
1289
        ch_used = 1;
1290
    } else {
1291
        ch_used = ch;
1292
    }
1293

    
1294
    AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);
1295

    
1296
    for (pass = 0; pass <= vr->maxpass; ++pass) { // FIXME OPTIMIZE?
1297
        uint_fast16_t voffset;
1298
        uint_fast16_t partition_count;
1299
        uint_fast16_t j_times_ptns_to_read;
1300

    
1301
        voffset = vr->begin;
1302
        for (partition_count = 0; partition_count < ptns_to_read;) {  // SPEC        error
1303
            if (!pass) {
1304
                uint_fast32_t inverse_class = ff_inverse[vr->classifications];
1305
                for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {
1306
                    if (!do_not_decode[j]) {
1307
                        uint_fast32_t temp = get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,
1308
                        vc->codebooks[vr->classbook].nb_bits, 3);
1309

    
1310
                        AV_DEBUG("Classword: %d \n", temp);
1311

    
1312
                        assert(vr->classifications > 1 && temp <= 65536); //needed for inverse[]
1313
                        for (i = 0; i < c_p_c; ++i) {
1314
                            uint_fast32_t temp2;
1315

    
1316
                            temp2 = (((uint_fast64_t)temp) * inverse_class) >> 32;
1317
                            if (partition_count + c_p_c - 1 - i < ptns_to_read)
1318
                                classifs[j_times_ptns_to_read + partition_count + c_p_c - 1 - i] = temp - temp2 * vr->classifications;
1319
                            temp = temp2;
1320
                        }
1321
                    }
1322
                    j_times_ptns_to_read += ptns_to_read;
1323
                }
1324
            }
1325
            for (i = 0; (i < c_p_c) && (partition_count < ptns_to_read); ++i) {
1326
                for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {
1327
                    uint_fast16_t voffs;
1328

    
1329
                    if (!do_not_decode[j]) {
1330
                        uint_fast8_t vqclass = classifs[j_times_ptns_to_read+partition_count];
1331
                        int_fast16_t vqbook = vr->books[vqclass][pass];
1332

    
1333
                        if (vqbook >= 0 && vc->codebooks[vqbook].codevectors) {
1334
                            uint_fast16_t coffs;
1335
                            unsigned dim =  vc->codebooks[vqbook].dimensions; // not uint_fast8_t: 64bit is slower here on amd64
1336
                            uint_fast16_t step = dim == 1 ? vr->partition_size
1337
                                                          : FASTDIV(vr->partition_size, dim);
1338
                            vorbis_codebook codebook = vc->codebooks[vqbook];
1339

    
1340
                            if (vr_type == 0) {
1341

    
1342
                                voffs = voffset+j*vlen;
1343
                                for (k = 0; k < step; ++k) {
1344
                                    coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1345
                                    for (l = 0; l < dim; ++l)
1346
                                        vec[voffs + k + l * step] += codebook.codevectors[coffs + l];  // FPMATH
1347
                                }
1348
                            } else if (vr_type == 1) {
1349
                                voffs = voffset + j * vlen;
1350
                                for (k = 0; k < step; ++k) {
1351
                                    coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1352
                                    for (l = 0; l < dim; ++l, ++voffs) {
1353
                                        vec[voffs]+=codebook.codevectors[coffs+l];  // FPMATH
1354

    
1355
                                        AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d  \n", pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);
1356
                                    }
1357
                                }
1358
                            } else if (vr_type == 2 && ch == 2 && (voffset & 1) == 0 && (dim & 1) == 0) { // most frequent case optimized
1359
                                voffs = voffset >> 1;
1360

    
1361
                                if (dim == 2) {
1362
                                    for (k = 0; k < step; ++k) {
1363
                                        coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;
1364
                                        vec[voffs + k       ] += codebook.codevectors[coffs    ];  // FPMATH
1365
                                        vec[voffs + k + vlen] += codebook.codevectors[coffs + 1];  // FPMATH
1366
                                    }
1367
                                } else if (dim == 4) {
1368
                                    for (k = 0; k < step; ++k, voffs += 2) {
1369
                                        coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4;
1370
                                        vec[voffs           ] += codebook.codevectors[coffs    ];  // FPMATH
1371
                                        vec[voffs + 1       ] += codebook.codevectors[coffs + 2];  // FPMATH
1372
                                        vec[voffs + vlen    ] += codebook.codevectors[coffs + 1];  // FPMATH
1373
                                        vec[voffs + vlen + 1] += codebook.codevectors[coffs + 3];  // FPMATH
1374
                                    }
1375
                                } else
1376
                                for (k = 0; k < step; ++k) {
1377
                                    coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1378
                                    for (l = 0; l < dim; l += 2, voffs++) {
1379
                                        vec[voffs       ] += codebook.codevectors[coffs + l    ];  // FPMATH
1380
                                        vec[voffs + vlen] += codebook.codevectors[coffs + l + 1];  // FPMATH
1381

    
1382
                                        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);
1383
                                    }
1384
                                }
1385

    
1386
                            } else if (vr_type == 2) {
1387
                                voffs = voffset;
1388

    
1389
                                for (k = 0; k < step; ++k) {
1390
                                    coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1391
                                    for (l = 0; l < dim; ++l, ++voffs) {
1392
                                        vec[voffs / ch + (voffs % ch) * vlen] += codebook.codevectors[coffs + l];  // FPMATH FIXME use if and counter instead of / and %
1393

    
1394
                                        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);
1395
                                    }
1396
                                }
1397
                            }
1398
                        }
1399
                    }
1400
                    j_times_ptns_to_read += ptns_to_read;
1401
                }
1402
                ++partition_count;
1403
                voffset += vr->partition_size;
1404
            }
1405
        }
1406
    }
1407
    return 0;
1408
}
1409

    
1410
static inline int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr,
1411
                                        uint_fast8_t ch,
1412
                                        uint_fast8_t *do_not_decode,
1413
                                        float *vec, uint_fast16_t vlen)
1414
{
1415
    if (vr->type == 2)
1416
        return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 2);
1417
    else if (vr->type == 1)
1418
        return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 1);
1419
    else if (vr->type == 0)
1420
        return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 0);
1421
    else {
1422
        av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");
1423
        return -1;
1424
    }
1425
}
1426

    
1427
void vorbis_inverse_coupling(float *mag, float *ang, int blocksize)
1428
{
1429
    int i;
1430
    for (i = 0;  i < blocksize;  i++) {
1431
        if (mag[i] > 0.0) {
1432
            if (ang[i] > 0.0) {
1433
                ang[i] = mag[i] - ang[i];
1434
            } else {
1435
                float temp = ang[i];
1436
                ang[i]     = mag[i];
1437
                mag[i]    += temp;
1438
            }
1439
        } else {
1440
            if (ang[i] > 0.0) {
1441
                ang[i] += mag[i];
1442
            } else {
1443
                float temp = ang[i];
1444
                ang[i]     = mag[i];
1445
                mag[i]    -= temp;
1446
            }
1447
        }
1448
    }
1449
}
1450

    
1451
// Decode the audio packet using the functions above
1452

    
1453
static int vorbis_parse_audio_packet(vorbis_context *vc)
1454
{
1455
    GetBitContext *gb = &vc->gb;
1456
    FFTContext *mdct;
1457
    uint_fast8_t previous_window = vc->previous_window;
1458
    uint_fast8_t mode_number;
1459
    uint_fast8_t blockflag;
1460
    uint_fast16_t blocksize;
1461
    int_fast32_t i,j;
1462
    uint_fast8_t no_residue[255];
1463
    uint_fast8_t do_not_decode[255];
1464
    vorbis_mapping *mapping;
1465
    float *ch_res_ptr   = vc->channel_residues;
1466
    float *ch_floor_ptr = vc->channel_floors;
1467
    uint_fast8_t res_chan[255];
1468
    uint_fast8_t res_num = 0;
1469
    int_fast16_t retlen  = 0;
1470

    
1471
    if (get_bits1(gb)) {
1472
        av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");
1473
        return -1; // packet type not audio
1474
    }
1475

    
1476
    if (vc->mode_count == 1) {
1477
        mode_number = 0;
1478
    } else {
1479
        GET_VALIDATED_INDEX(mode_number, ilog(vc->mode_count-1), vc->mode_count)
1480
    }
1481
    vc->mode_number = mode_number;
1482
    mapping = &vc->mappings[vc->modes[mode_number].mapping];
1483

    
1484
    AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);
1485

    
1486
    blockflag = vc->modes[mode_number].blockflag;
1487
    blocksize = vc->blocksize[blockflag];
1488
    if (blockflag)
1489
        skip_bits(gb, 2); // previous_window, next_window
1490

    
1491
    memset(ch_res_ptr,   0, sizeof(float) * vc->audio_channels * blocksize / 2); //FIXME can this be removed ?
1492
    memset(ch_floor_ptr, 0, sizeof(float) * vc->audio_channels * blocksize / 2); //FIXME can this be removed ?
1493

    
1494
// Decode floor
1495

    
1496
    for (i = 0; i < vc->audio_channels; ++i) {
1497
        vorbis_floor *floor;
1498
        int ret;
1499
        if (mapping->submaps > 1) {
1500
            floor = &vc->floors[mapping->submap_floor[mapping->mux[i]]];
1501
        } else {
1502
            floor = &vc->floors[mapping->submap_floor[0]];
1503
        }
1504

    
1505
        ret = floor->decode(vc, &floor->data, ch_floor_ptr);
1506

    
1507
        if (ret < 0) {
1508
            av_log(vc->avccontext, AV_LOG_ERROR, "Invalid codebook in vorbis_floor_decode.\n");
1509
            return -1;
1510
        }
1511
        no_residue[i] = ret;
1512
        ch_floor_ptr += blocksize / 2;
1513
    }
1514

    
1515
// Nonzero vector propagate
1516

    
1517
    for (i = mapping->coupling_steps - 1; i >= 0; --i) {
1518
        if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {
1519
            no_residue[mapping->magnitude[i]] = 0;
1520
            no_residue[mapping->angle[i]]     = 0;
1521
        }
1522
    }
1523

    
1524
// Decode residue
1525

    
1526
    for (i = 0; i < mapping->submaps; ++i) {
1527
        vorbis_residue *residue;
1528
        uint_fast8_t ch = 0;
1529

    
1530
        for (j = 0; j < vc->audio_channels; ++j) {
1531
            if ((mapping->submaps == 1) || (i == mapping->mux[j])) {
1532
                res_chan[j] = res_num;
1533
                if (no_residue[j]) {
1534
                    do_not_decode[ch] = 1;
1535
                } else {
1536
                    do_not_decode[ch] = 0;
1537
                }
1538
                ++ch;
1539
                ++res_num;
1540
            }
1541
        }
1542
        residue = &vc->residues[mapping->submap_residue[i]];
1543
        vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);
1544

    
1545
        ch_res_ptr += ch * blocksize / 2;
1546
    }
1547

    
1548
// Inverse coupling
1549

    
1550
    for (i = mapping->coupling_steps - 1; i >= 0; --i) { //warning: i has to be signed
1551
        float *mag, *ang;
1552

    
1553
        mag = vc->channel_residues+res_chan[mapping->magnitude[i]] * blocksize / 2;
1554
        ang = vc->channel_residues+res_chan[mapping->angle[i]]     * blocksize / 2;
1555
        vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize / 2);
1556
    }
1557

    
1558
// Dotproduct, MDCT
1559

    
1560
    mdct = &vc->mdct[blockflag];
1561

    
1562
    for (j = vc->audio_channels-1;j >= 0; j--) {
1563
        ch_floor_ptr = vc->channel_floors   + j           * blocksize / 2;
1564
        ch_res_ptr   = vc->channel_residues + res_chan[j] * blocksize / 2;
1565
        vc->dsp.vector_fmul(ch_floor_ptr, ch_floor_ptr, ch_res_ptr, blocksize / 2);
1566
        mdct->imdct_half(mdct, ch_res_ptr, ch_floor_ptr);
1567
    }
1568

    
1569
// Overlap/add, save data for next overlapping  FPMATH
1570

    
1571
    retlen = (blocksize + vc->blocksize[previous_window]) / 4;
1572
    for (j = 0; j < vc->audio_channels; j++) {
1573
        uint_fast16_t bs0 = vc->blocksize[0];
1574
        uint_fast16_t bs1 = vc->blocksize[1];
1575
        float *residue    = vc->channel_residues + res_chan[j] * blocksize / 2;
1576
        float *saved      = vc->saved + j * bs1 / 4;
1577
        float *ret        = vc->channel_floors + j * retlen;
1578
        float *buf        = residue;
1579
        const float *win  = vc->win[blockflag & previous_window];
1580

    
1581
        if (blockflag == previous_window) {
1582
            vc->dsp.vector_fmul_window(ret, saved, buf, win, blocksize / 4);
1583
        } else if (blockflag > previous_window) {
1584
            vc->dsp.vector_fmul_window(ret, saved, buf, win, bs0 / 4);
1585
            memcpy(ret+bs0/2, buf+bs0/4, ((bs1-bs0)/4) * sizeof(float));
1586
        } else {
1587
            memcpy(ret, saved, ((bs1 - bs0) / 4) * sizeof(float));
1588
            vc->dsp.vector_fmul_window(ret + (bs1 - bs0) / 4, saved + (bs1 - bs0) / 4, buf, win, bs0 / 4);
1589
        }
1590
        memcpy(saved, buf + blocksize / 4, blocksize / 4 * sizeof(float));
1591
    }
1592

    
1593
    vc->previous_window = blockflag;
1594
    return retlen;
1595
}
1596

    
1597
// Return the decoded audio packet through the standard api
1598

    
1599
static int vorbis_decode_frame(AVCodecContext *avccontext,
1600
                               void *data, int *data_size,
1601
                               AVPacket *avpkt)
1602
{
1603
    const uint8_t *buf = avpkt->data;
1604
    int buf_size       = avpkt->size;
1605
    vorbis_context *vc = avccontext->priv_data ;
1606
    GetBitContext *gb = &(vc->gb);
1607
    const float *channel_ptrs[255];
1608
    int i;
1609

    
1610
    int_fast16_t len;
1611

    
1612
    if (!buf_size)
1613
        return 0;
1614

    
1615
    AV_DEBUG("packet length %d \n", buf_size);
1616

    
1617
    init_get_bits(gb, buf, buf_size*8);
1618

    
1619
    len = vorbis_parse_audio_packet(vc);
1620

    
1621
    if (len <= 0) {
1622
        *data_size = 0;
1623
        return buf_size;
1624
    }
1625

    
1626
    if (!vc->first_frame) {
1627
        vc->first_frame = 1;
1628
        *data_size = 0;
1629
        return buf_size ;
1630
    }
1631

    
1632
    AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);
1633

    
1634
    if (vc->audio_channels > 8) {
1635
        for (i = 0; i < vc->audio_channels; i++)
1636
            channel_ptrs[i] = vc->channel_floors + i * len;
1637
    } else {
1638
        for (i = 0; i < vc->audio_channels; i++)
1639
            channel_ptrs[i] = vc->channel_floors +
1640
                              len * ff_vorbis_channel_layout_offsets[vc->audio_channels - 1][i];
1641
    }
1642

    
1643
    /* ffdshow custom code */
1644
#if CONFIG_AUDIO_FLOAT
1645
    float_interleave(data, channel_ptrs, len, vc->audio_channels);
1646
    *data_size = len * sizeof(float) * vc->audio_channels;
1647
#else
1648
    vc->fmt_conv.float_to_int16_interleave(data, channel_ptrs, len,
1649
                                           vc->audio_channels);
1650
    *data_size = len * 2 * vc->audio_channels;
1651
#endif
1652

    
1653
    return buf_size ;
1654
}
1655

    
1656
// Close decoder
1657

    
1658
static av_cold int vorbis_decode_close(AVCodecContext *avccontext)
1659
{
1660
    vorbis_context *vc = avccontext->priv_data;
1661

    
1662
    vorbis_free(vc);
1663

    
1664
    return 0 ;
1665
}
1666

    
1667
AVCodec ff_vorbis_decoder = {
1668
    "vorbis",
1669
    AVMEDIA_TYPE_AUDIO,
1670
    CODEC_ID_VORBIS,
1671
    sizeof(vorbis_context),
1672
    vorbis_decode_init,
1673
    NULL,
1674
    vorbis_decode_close,
1675
    vorbis_decode_frame,
1676
    .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),
1677
    .channel_layouts = ff_vorbis_channel_layouts,
1678
};
1679