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1
/**
2
 * @file vorbis.c
3
 * Vorbis I decoder
4
 * @author Denes Balatoni  ( dbalatoni programozo hu )
5

6
 * This library is free software; you can redistribute it and/or
7
 * modify it under the terms of the GNU Lesser General Public
8
 * License as published by the Free Software Foundation; either
9
 * version 2 of the License, or (at your option) any later version.
10
 *
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 * This library is distributed in the hope that it will be useful,
12
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14
 * Lesser General Public License for more details.
15
 *
16
 * You should have received a copy of the GNU Lesser General Public
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 * License along with this library; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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 *
20
 */
21

    
22
#undef V_DEBUG
23

    
24
#include <math.h>
25

    
26
#define ALT_BITSTREAM_READER_LE
27
#include "avcodec.h"
28
#include "bitstream.h"
29
#include "dsputil.h"
30

    
31
#include "vorbis.h"
32

    
33
#define V_NB_BITS 11
34
#define V_MAX_VLCS (1<<16)
35

    
36
#ifndef V_DEBUG
37
#define AV_DEBUG(...)
38
#endif
39

    
40

    
41

    
42
/* Helper functions */
43

    
44
/**
45
 *  reads 0-32 bits when using the ALT_BITSTREAM_READER_LE bitstream reader
46
 */
47
unsigned int get_bits_long_le(GetBitContext *s, int n){
48
    if(n<=17) return get_bits(s, n);
49
    else{
50
        int ret= get_bits(s, 16);
51
        return ret | (get_bits(s, n-16) << 16);
52
    }
53
}
54

    
55
static unsigned int ilog(unsigned int i) { // unfortunatelly av_log2 uses different rounding
56
    unsigned int ret=0;
57
    while (i!=0) {
58
        ++ret;
59
        i>>=1;
60
    }
61
    return ret;
62
}
63

    
64
static unsigned int nth_root(unsigned int x, unsigned int n) {   // x^(1/n)
65
    unsigned int ret=0, i, j;
66

    
67
    do {
68
        ++ret;
69
        for(i=0,j=ret;i<n-1;i++) j*=ret;
70
    } while (j<=x);
71

    
72
    return (ret-1);
73
}
74

    
75
static float vorbisfloat2float(uint_fast32_t val) {
76
    double mant=val&0x1fffff;
77
    long exp=(val&0x7fe00000L)>>21;
78
    if (val&0x80000000) mant=-mant;
79
    return(ldexp(mant, exp-20-768));
80
}
81

    
82

    
83
// Generate vlc codes from vorbis huffman code lengths
84

    
85
static int vorbis_len2vlc(vorbis_context *vc, uint_fast8_t *bits, uint_fast32_t *codes, uint_fast32_t num) {
86
    uint_fast32_t exit_at_level[33]={404,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
87
        0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
88

    
89
    uint_fast8_t i,j;
90
    uint_fast32_t code,p;
91

    
92
#ifdef V_DEBUG
93
    GetBitContext gb;
94
#endif
95

    
96
    for(p=0;(bits[p]==0) && (p<num);++p);
97
    if (p==num) {
98
//        av_log(vc->avccontext, AV_LOG_INFO, "An empty codebook. Heh?! \n");
99
        return 0;
100
    }
101

    
102
    codes[p]=0;
103
    for(i=0;i<bits[p];++i) {
104
        exit_at_level[i+1]=1<<i;
105
    }
106

    
107
#ifdef V_DEBUG
108
    av_log(vc->avccontext, AV_LOG_INFO, " %d. of %d code len %d code %d - ", p, num, bits[p], codes[p]);
109
    init_get_bits(&gb, (uint_fast8_t *)&codes[p], bits[p]);
110
    for(i=0;i<bits[p];++i) {
111
        av_log(vc->avccontext, AV_LOG_INFO, "%s", get_bits1(&gb) ? "1" : "0");
112
    }
113
    av_log(vc->avccontext, AV_LOG_INFO, "\n");
114
#endif
115

    
116
    ++p;
117

    
118
    for(;p<num;++p) {
119
        if (bits[p]==0) continue;
120
        // find corresponding exit(node which the tree can grow further from)
121
        for(i=bits[p];i>0;--i) {
122
            if (exit_at_level[i]) break;
123
        }
124
        if (!i) return 1; // overspecified tree
125
        code=exit_at_level[i];
126
        exit_at_level[i]=0;
127
        // construct code (append 0s to end) and introduce new exits
128
        for(j=i+1;j<=bits[p];++j) {
129
            exit_at_level[j]=code+(1<<(j-1));
130
        }
131
        codes[p]=code;
132

    
133
#ifdef V_DEBUG
134
        av_log(vc->avccontext, AV_LOG_INFO, " %d. code len %d code %d - ", p, bits[p], codes[p]);
135
        init_get_bits(&gb, (uint_fast8_t *)&codes[p], bits[p]);
136
        for(i=0;i<bits[p];++i) {
137
            av_log(vc->avccontext, AV_LOG_INFO, "%s", get_bits1(&gb) ? "1" : "0");
138
        }
139
        av_log(vc->avccontext, AV_LOG_INFO, "\n");
140
#endif
141

    
142
    }
143

    
144
    //FIXME no exits should be left (underspecified tree - ie. unused valid vlcs - not allowed by SPEC)
145

    
146
    return 0;
147
}
148

    
149
// Free all allocated memory -----------------------------------------
150

    
151
static void vorbis_free(vorbis_context *vc) {
152
    int_fast16_t i;
153

    
154
    av_freep(&vc->channel_residues);
155
    av_freep(&vc->channel_floors);
156
    av_freep(&vc->saved);
157
    av_freep(&vc->ret);
158
    av_freep(&vc->buf);
159
    av_freep(&vc->buf_tmp);
160

    
161
    av_freep(&vc->residues);
162
    av_freep(&vc->modes);
163

    
164
    ff_mdct_end(&vc->mdct0);
165
    ff_mdct_end(&vc->mdct1);
166

    
167
    for(i=0;i<vc->codebook_count;++i) {
168
        av_free(vc->codebooks[i].codevectors);
169
        free_vlc(&vc->codebooks[i].vlc);
170
    }
171
    av_freep(&vc->codebooks);
172

    
173
    for(i=0;i<vc->floor_count;++i) {
174
        av_free(vc->floors[i].x_list);
175
        av_free(vc->floors[i].x_list_order);
176
        av_free(vc->floors[i].low_neighbour);
177
        av_free(vc->floors[i].high_neighbour);
178
    }
179
    av_freep(&vc->floors);
180

    
181
    for(i=0;i<vc->mapping_count;++i) {
182
        av_free(vc->mappings[i].magnitude);
183
        av_free(vc->mappings[i].angle);
184
        av_free(vc->mappings[i].mux);
185
    }
186
    av_freep(&vc->mappings);
187
}
188

    
189
// Parse setup header -------------------------------------------------
190

    
191
// Process codebooks part
192

    
193
static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc) {
194
    uint_fast16_t cb;
195
    uint_fast8_t *tmp_vlc_bits;
196
    uint_fast32_t *tmp_vlc_codes;
197
    GetBitContext *gb=&vc->gb;
198

    
199
    vc->codebook_count=get_bits(gb,8)+1;
200

    
201
    AV_DEBUG(" Codebooks: %d \n", vc->codebook_count);
202

    
203
    vc->codebooks=(vorbis_codebook *)av_mallocz(vc->codebook_count * sizeof(vorbis_codebook));
204
    tmp_vlc_bits=(uint_fast8_t *)av_mallocz(V_MAX_VLCS * sizeof(uint_fast8_t));
205
    tmp_vlc_codes=(uint_fast32_t *)av_mallocz(V_MAX_VLCS * sizeof(uint_fast32_t));
206

    
207
    for(cb=0;cb<vc->codebook_count;++cb) {
208
        vorbis_codebook *codebook_setup=&vc->codebooks[cb];
209
        uint_fast8_t ordered;
210
        uint_fast32_t t, used_entries=0;
211
        uint_fast32_t entries;
212

    
213
        AV_DEBUG(" %d. Codebook \n", cb);
214

    
215
        if (get_bits(gb, 24)!=0x564342) {
216
            av_log(vc->avccontext, AV_LOG_ERROR, " %d. Codebook setup data corrupt. \n", cb);
217
            goto error;
218
        }
219

    
220
        codebook_setup->dimensions=get_bits(gb, 16);
221
        if (codebook_setup->dimensions>16) {
222
            av_log(vc->avccontext, AV_LOG_ERROR, " %d. Codebook's dimension is too large (%d). \n", cb, codebook_setup->dimensions);
223
            goto error;
224
        }
225
        entries=get_bits(gb, 24);
226
        if (entries>V_MAX_VLCS) {
227
            av_log(vc->avccontext, AV_LOG_ERROR, " %d. Codebook has too many entries (%d). \n", cb, entries);
228
            goto error;
229
        }
230

    
231
        ordered=get_bits1(gb);
232

    
233
        AV_DEBUG(" codebook_dimensions %d, codebook_entries %d \n", codebook_setup->dimensions, entries);
234

    
235
        if (!ordered) {
236
            uint_fast16_t ce;
237
            uint_fast8_t flag;
238
            uint_fast8_t sparse=get_bits1(gb);
239

    
240
            AV_DEBUG(" not ordered \n");
241

    
242
            if (sparse) {
243
                AV_DEBUG(" sparse \n");
244

    
245
                used_entries=0;
246
                for(ce=0;ce<entries;++ce) {
247
                    flag=get_bits1(gb);
248
                    if (flag) {
249
                        tmp_vlc_bits[ce]=get_bits(gb, 5)+1;
250
                        ++used_entries;
251
                    }
252
                    else tmp_vlc_bits[ce]=0;
253
                }
254
            } else {
255
                AV_DEBUG(" not sparse \n");
256

    
257
                used_entries=entries;
258
                for(ce=0;ce<entries;++ce) {
259
                    tmp_vlc_bits[ce]=get_bits(gb, 5)+1;
260
                }
261
            }
262
        } else {
263
            uint_fast16_t current_entry=0;
264
            uint_fast8_t current_length=get_bits(gb, 5)+1;
265

    
266
            AV_DEBUG(" ordered, current length: %d \n", current_length);  //FIXME
267

    
268
            used_entries=entries;
269
            for(;current_entry<used_entries;++current_length) {
270
                uint_fast16_t i, number;
271

    
272
                AV_DEBUG(" number bits: %d ", ilog(entries - current_entry));
273

    
274
                number=get_bits(gb, ilog(entries - current_entry));
275

    
276
                AV_DEBUG(" number: %d \n", number);
277

    
278
                for(i=current_entry;i<number+current_entry;++i) {
279
                    if (i<used_entries) tmp_vlc_bits[i]=current_length;
280
                }
281

    
282
                current_entry+=number;
283
            }
284
            if (current_entry>used_entries) {
285
                av_log(vc->avccontext, AV_LOG_ERROR, " More codelengths than codes in codebook. \n");
286
                goto error;
287
            }
288
        }
289

    
290
        codebook_setup->lookup_type=get_bits(gb, 4);
291

    
292
        AV_DEBUG(" lookup type: %d : %s \n", codebook_setup->lookup_type, codebook_setup->lookup_type ? "vq" : "no lookup" );
293

    
294
// If the codebook is used for (inverse) VQ, calculate codevectors.
295

    
296
        if (codebook_setup->lookup_type==1) {
297
            uint_fast16_t i, j, k;
298
            uint_fast16_t codebook_lookup_values=nth_root(entries, codebook_setup->dimensions);
299
            uint_fast16_t codebook_multiplicands[codebook_lookup_values];
300

    
301
            float codebook_minimum_value=vorbisfloat2float(get_bits_long_le(gb, 32));
302
            float codebook_delta_value=vorbisfloat2float(get_bits_long_le(gb, 32));
303
            uint_fast8_t codebook_value_bits=get_bits(gb, 4)+1;
304
            uint_fast8_t codebook_sequence_p=get_bits1(gb);
305

    
306
            AV_DEBUG(" We expect %d numbers for building the codevectors. \n", codebook_lookup_values);
307
            AV_DEBUG("  delta %f minmum %f \n", codebook_delta_value, codebook_minimum_value);
308

    
309
            for(i=0;i<codebook_lookup_values;++i) {
310
                codebook_multiplicands[i]=get_bits(gb, codebook_value_bits);
311

    
312
                AV_DEBUG(" multiplicands*delta+minmum : %e \n", (float)codebook_multiplicands[i]*codebook_delta_value+codebook_minimum_value);
313
                AV_DEBUG(" multiplicand %d \n", codebook_multiplicands[i]);
314
            }
315

    
316
// Weed out unused vlcs and build codevector vector
317
            codebook_setup->codevectors=(float *)av_mallocz(used_entries*codebook_setup->dimensions * sizeof(float));
318
            for(j=0, i=0;i<entries;++i) {
319
                uint_fast8_t dim=codebook_setup->dimensions;
320

    
321
                if (tmp_vlc_bits[i]) {
322
                    float last=0.0;
323
                    uint_fast32_t lookup_offset=i;
324

    
325
#ifdef V_DEBUG
326
                    av_log(vc->avccontext, AV_LOG_INFO, "Lookup offset %d ,", i);
327
#endif
328

    
329
                    for(k=0;k<dim;++k) {
330
                        uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values;
331
                        codebook_setup->codevectors[j*dim+k]=codebook_multiplicands[multiplicand_offset]*codebook_delta_value+codebook_minimum_value+last;
332
                        if (codebook_sequence_p) {
333
                            last=codebook_setup->codevectors[j*dim+k];
334
                        }
335
                        lookup_offset/=codebook_lookup_values;
336
                    }
337
                    tmp_vlc_bits[j]=tmp_vlc_bits[i];
338

    
339
#ifdef V_DEBUG
340
                    av_log(vc->avccontext, AV_LOG_INFO, "real lookup offset %d, vector: ", j);
341
                    for(k=0;k<dim;++k) {
342
                        av_log(vc->avccontext, AV_LOG_INFO, " %f ", codebook_setup->codevectors[j*dim+k]);
343
                    }
344
                    av_log(vc->avccontext, AV_LOG_INFO, "\n");
345
#endif
346

    
347
                    ++j;
348
                }
349
            }
350
            if (j!=used_entries) {
351
                av_log(vc->avccontext, AV_LOG_ERROR, "Bug in codevector vector building code. \n");
352
                goto error;
353
            }
354
            entries=used_entries;
355
        }
356
        else if (codebook_setup->lookup_type>=2) {
357
            av_log(vc->avccontext, AV_LOG_ERROR, "Codebook lookup type not supported. \n");
358
            goto error;
359
        }
360

    
361
// Initialize VLC table
362
        if (vorbis_len2vlc(vc, tmp_vlc_bits, tmp_vlc_codes, entries)) {
363
            av_log(vc->avccontext, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");
364
            goto error;
365
        }
366
        codebook_setup->maxdepth=0;
367
        for(t=0;t<entries;++t)
368
            if (tmp_vlc_bits[t]>=codebook_setup->maxdepth) codebook_setup->maxdepth=tmp_vlc_bits[t];
369

    
370
        codebook_setup->maxdepth=(codebook_setup->maxdepth+V_NB_BITS-1)/V_NB_BITS;
371

    
372
        if (init_vlc(&codebook_setup->vlc, V_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)) {
373
            av_log(vc->avccontext, AV_LOG_ERROR, " Error generating vlc tables. \n");
374
            goto error;
375
        }
376
    }
377

    
378
    av_free(tmp_vlc_bits);
379
    av_free(tmp_vlc_codes);
380
    return 0;
381

    
382
// Error:
383
error:
384
    av_free(tmp_vlc_bits);
385
    av_free(tmp_vlc_codes);
386
    return 1;
387
}
388

    
389
// Process time domain transforms part (unused in Vorbis I)
390

    
391
static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc) {
392
    GetBitContext *gb=&vc->gb;
393
    uint_fast8_t i;
394
    uint_fast8_t vorbis_time_count=get_bits(gb, 6)+1;
395

    
396
    for(i=0;i<vorbis_time_count;++i) {
397
        uint_fast16_t vorbis_tdtransform=get_bits(gb, 16);
398

    
399
        AV_DEBUG(" Vorbis time domain transform %d: %d \n", vorbis_time_count, vorbis_tdtransform);
400

    
401
        if (vorbis_tdtransform) {
402
            av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n");
403
            return 1;
404
        }
405
    }
406
    return 0;
407
}
408

    
409
// Process floors part - only floor type 1 is supported
410

    
411
static int vorbis_parse_setup_hdr_floors(vorbis_context *vc) {
412
    GetBitContext *gb=&vc->gb;
413
    uint_fast16_t i,j,k;
414

    
415
    vc->floor_count=get_bits(gb, 6)+1;
416

    
417
    vc->floors=(vorbis_floor *)av_mallocz(vc->floor_count * sizeof(vorbis_floor));
418

    
419
    for (i=0;i<vc->floor_count;++i) {
420
        vorbis_floor *floor_setup=&vc->floors[i];
421

    
422
        floor_setup->floor_type=get_bits(gb, 16);
423

    
424
        AV_DEBUG(" %d. floor type %d \n", i, floor_setup->floor_type);
425

    
426
        if (floor_setup->floor_type==1) {
427
            uint_fast8_t maximum_class=0;
428
            uint_fast8_t rangebits;
429
            uint_fast16_t floor1_values=2;
430

    
431
            floor_setup->partitions=get_bits(gb, 5);
432

    
433
            AV_DEBUG(" %d.floor: %d partitions \n", i, floor_setup->partitions);
434

    
435
            for(j=0;j<floor_setup->partitions;++j) {
436
                floor_setup->partition_class[j]=get_bits(gb, 4);
437
                if (floor_setup->partition_class[j]>maximum_class) maximum_class=floor_setup->partition_class[j];
438

    
439
                AV_DEBUG(" %d. floor %d partition class %d \n", i, j, floor_setup->partition_class[j]);
440

    
441
            }
442

    
443
            AV_DEBUG(" maximum class %d \n", maximum_class);
444

    
445
            floor_setup->maximum_class=maximum_class;
446

    
447
            for(j=0;j<=maximum_class;++j) {
448
                floor_setup->class_dimensions[j]=get_bits(gb, 3)+1;
449
                floor_setup->class_subclasses[j]=get_bits(gb, 2);
450

    
451
                AV_DEBUG(" %d floor %d class dim: %d subclasses %d \n", i, j, floor_setup->class_dimensions[j], floor_setup->class_subclasses[j]);
452

    
453
                if (floor_setup->class_subclasses[j]) {
454
                    floor_setup->class_masterbook[j]=get_bits(gb, 8);
455

    
456
                    AV_DEBUG("   masterbook: %d \n", floor_setup->class_masterbook[j]);
457
                }
458

    
459
                for(k=0;k<(1<<floor_setup->class_subclasses[j]);++k) {
460
                    floor_setup->subclass_books[j][k]=get_bits(gb, 8)-1;
461

    
462
                    AV_DEBUG("    book %d. : %d \n", k, floor_setup->subclass_books[j][k]);
463
                }
464
            }
465

    
466
            floor_setup->multiplier=get_bits(gb, 2)+1;
467
            floor_setup->x_list_dim=2;
468

    
469
            for(j=0;j<floor_setup->partitions;++j) {
470
                floor_setup->x_list_dim+=floor_setup->class_dimensions[floor_setup->partition_class[j]];
471
            }
472

    
473
            floor_setup->x_list=(uint_fast16_t *)av_mallocz(floor_setup->x_list_dim * sizeof(uint_fast16_t));
474
            floor_setup->x_list_order=(uint_fast16_t *)av_mallocz(floor_setup->x_list_dim * sizeof(uint_fast16_t));
475
            floor_setup->low_neighbour=(uint_fast16_t *)av_mallocz(floor_setup->x_list_dim * sizeof(uint_fast16_t));
476
            floor_setup->high_neighbour=(uint_fast16_t *)av_mallocz(floor_setup->x_list_dim * sizeof(uint_fast16_t));
477

    
478

    
479
            rangebits=get_bits(gb, 4);
480
            floor_setup->x_list[0] = 0;
481
            floor_setup->x_list[1] = (1<<rangebits);
482

    
483
            for(j=0;j<floor_setup->partitions;++j) {
484
                for(k=0;k<floor_setup->class_dimensions[floor_setup->partition_class[j]];++k,++floor1_values) {
485
                    floor_setup->x_list[floor1_values]=get_bits(gb, rangebits);
486

    
487
                    AV_DEBUG(" %d. floor1 Y coord. %d \n", floor1_values, floor_setup->x_list[floor1_values]);
488
                }
489
            }
490

    
491
// Precalculate order of x coordinates - needed for decode
492

    
493
            for(k=0;k<floor_setup->x_list_dim;++k) {
494
                floor_setup->x_list_order[k]=k;
495
            }
496

    
497
            for(k=0;k<floor_setup->x_list_dim-1;++k) {   // FIXME optimize sorting ?
498
                for(j=k+1;j<floor_setup->x_list_dim;++j) {
499
                    if(floor_setup->x_list[floor_setup->x_list_order[k]]>floor_setup->x_list[floor_setup->x_list_order[j]]) {
500
                        uint_fast16_t tmp=floor_setup->x_list_order[k];
501
                        floor_setup->x_list_order[k]=floor_setup->x_list_order[j];
502
                        floor_setup->x_list_order[j]=tmp;
503
                    }
504
                }
505
            }
506

    
507
// Precalculate low and high neighbours
508

    
509
            for(k=2;k<floor_setup->x_list_dim;++k) {
510
                floor_setup->low_neighbour[k]=0;
511
                floor_setup->high_neighbour[k]=1;  // correct according to SPEC requirements
512

    
513
                for (j=0;j<k;++j) {
514
                    if ((floor_setup->x_list[j]<floor_setup->x_list[k]) &&
515
                      (floor_setup->x_list[j]>floor_setup->x_list[floor_setup->low_neighbour[k]])) {
516
                        floor_setup->low_neighbour[k]=j;
517
                    }
518
                    if ((floor_setup->x_list[j]>floor_setup->x_list[k]) &&
519
                      (floor_setup->x_list[j]<floor_setup->x_list[floor_setup->high_neighbour[k]])) {
520
                        floor_setup->high_neighbour[k]=j;
521
                    }
522
                }
523
            }
524
        }
525
        else {
526
            av_log(vc->avccontext, AV_LOG_ERROR, "Only floor type 1 supported. \n");
527
            return 1;
528
        }
529
    }
530
    return 0;
531
}
532

    
533
// Process residues part
534

    
535
static int vorbis_parse_setup_hdr_residues(vorbis_context *vc){
536
    GetBitContext *gb=&vc->gb;
537
    uint_fast8_t i, j, k;
538

    
539
    vc->residue_count=get_bits(gb, 6)+1;
540
    vc->residues=(vorbis_residue *)av_mallocz(vc->residue_count * sizeof(vorbis_residue));
541

    
542
    AV_DEBUG(" There are %d residues. \n", vc->residue_count);
543

    
544
    for(i=0;i<vc->residue_count;++i) {
545
        vorbis_residue *res_setup=&vc->residues[i];
546
        uint_fast8_t cascade[64];
547
        uint_fast8_t high_bits;
548
        uint_fast8_t low_bits;
549

    
550
        res_setup->type=get_bits(gb, 16);
551

    
552
        AV_DEBUG(" %d. residue type %d \n", i, res_setup->type);
553

    
554
        res_setup->begin=get_bits(gb, 24);
555
        res_setup->end=get_bits(gb, 24);
556
        res_setup->partition_size=get_bits(gb, 24)+1;
557
        res_setup->classifications=get_bits(gb, 6)+1;
558
        res_setup->classbook=get_bits(gb, 8);
559

    
560
        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,
561
          res_setup->classifications, res_setup->classbook);
562

    
563
        for(j=0;j<res_setup->classifications;++j) {
564
            high_bits=0;
565
            low_bits=get_bits(gb, 3);
566
            if (get_bits1(gb)) {
567
                high_bits=get_bits(gb, 5);
568
            }
569
            cascade[j]=(high_bits<<3)+low_bits;
570

    
571
            AV_DEBUG("     %d class casscade depth: %d \n", j, ilog(cascade[j]));
572
        }
573

    
574
        res_setup->maxpass=0;
575
        for(j=0;j<res_setup->classifications;++j) {
576
            for(k=0;k<8;++k) {
577
                if (cascade[j]&(1<<k)) {
578
                        res_setup->books[j][k]=get_bits(gb, 8);
579

    
580
                    AV_DEBUG("     %d class casscade depth %d book: %d \n", j, k, res_setup->books[j][k]);
581

    
582
                    if (k>res_setup->maxpass) {
583
                        res_setup->maxpass=k;
584
                    }
585
                } else {
586
                    res_setup->books[j][k]=-1;
587
                }
588
            }
589
        }
590
    }
591
    return 0;
592
}
593

    
594
// Process mappings part
595

    
596
static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc) {
597
    GetBitContext *gb=&vc->gb;
598
    uint_fast8_t i, j;
599

    
600
    vc->mapping_count=get_bits(gb, 6)+1;
601
    vc->mappings=(vorbis_mapping *)av_mallocz(vc->mapping_count * sizeof(vorbis_mapping));
602

    
603
    AV_DEBUG(" There are %d mappings. \n", vc->mapping_count);
604

    
605
    for(i=0;i<vc->mapping_count;++i) {
606
        vorbis_mapping *mapping_setup=&vc->mappings[i];
607

    
608
        if (get_bits(gb, 16)) {
609
            av_log(vc->avccontext, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n");
610
            return 1;
611
        }
612
        if (get_bits1(gb)) {
613
            mapping_setup->submaps=get_bits(gb, 4)+1;
614
        } else {
615
            mapping_setup->submaps=1;
616
        }
617

    
618
        if (get_bits1(gb)) {
619
            mapping_setup->coupling_steps=get_bits(gb, 8)+1;
620
            mapping_setup->magnitude=(uint_fast8_t *)av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
621
            mapping_setup->angle=(uint_fast8_t *)av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
622
            for(j=0;j<mapping_setup->coupling_steps;++j) {
623
                mapping_setup->magnitude[j]=get_bits(gb, ilog(vc->audio_channels-1));
624
                mapping_setup->angle[j]=get_bits(gb, ilog(vc->audio_channels-1));
625
                // FIXME: sanity checks
626
            }
627
        } else {
628
            mapping_setup->coupling_steps=0;
629
        }
630

    
631
        AV_DEBUG("   %d mapping coupling steps: %d \n", i, mapping_setup->coupling_steps);
632

    
633
        if(get_bits(gb, 2)) {
634
            av_log(vc->avccontext, AV_LOG_ERROR, "%d. mapping setup data invalid. \n", i);
635
            return 1; // following spec.
636
        }
637

    
638
        if (mapping_setup->submaps>1) {
639
            mapping_setup->mux=(uint_fast8_t *)av_mallocz(vc->audio_channels * sizeof(uint_fast8_t));
640
            for(j=0;j<vc->audio_channels;++j) {
641
                mapping_setup->mux[j]=get_bits(gb, 4);
642
            }
643
        }
644

    
645
        for(j=0;j<mapping_setup->submaps;++j) {
646
            get_bits(gb, 8); // FIXME check?
647
            mapping_setup->submap_floor[j]=get_bits(gb, 8);
648
            mapping_setup->submap_residue[j]=get_bits(gb, 8);
649

    
650
            AV_DEBUG("   %d mapping %d submap : floor %d, residue %d \n", i, j, mapping_setup->submap_floor[j], mapping_setup->submap_residue[j]);
651
        }
652
    }
653
    return 0;
654
}
655

    
656
// Process modes part
657

    
658
static int vorbis_parse_setup_hdr_modes(vorbis_context *vc) {
659
    GetBitContext *gb=&vc->gb;
660
    uint_fast8_t i;
661

    
662
    vc->mode_count=get_bits(gb, 6)+1;
663
    vc->modes=(vorbis_mode *)av_mallocz(vc->mode_count * sizeof(vorbis_mode));
664

    
665
    AV_DEBUG(" There are %d modes.\n", vc->mode_count);
666

    
667
    for(i=0;i<vc->mode_count;++i) {
668
        vorbis_mode *mode_setup=&vc->modes[i];
669

    
670
        mode_setup->blockflag=get_bits(gb, 1);
671
        mode_setup->windowtype=get_bits(gb, 16); //FIXME check
672
        mode_setup->transformtype=get_bits(gb, 16); //FIXME check
673
        mode_setup->mapping=get_bits(gb, 8); //FIXME check
674

    
675
        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);
676
    }
677
    return 0;
678
}
679

    
680
// Process the whole setup header using the functions above
681

    
682
static int vorbis_parse_setup_hdr(vorbis_context *vc) {
683
    GetBitContext *gb=&vc->gb;
684

    
685
    if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') ||
686
    (get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') ||
687
    (get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) {
688
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n");
689
        return 1;
690
    }
691

    
692
    if (vorbis_parse_setup_hdr_codebooks(vc)) {
693
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n");
694
        return 2;
695
    }
696
    if (vorbis_parse_setup_hdr_tdtransforms(vc)) {
697
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n");
698
        return 3;
699
    }
700
    if (vorbis_parse_setup_hdr_floors(vc)) {
701
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n");
702
        return 4;
703
    }
704
    if (vorbis_parse_setup_hdr_residues(vc)) {
705
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n");
706
        return 5;
707
    }
708
    if (vorbis_parse_setup_hdr_mappings(vc)) {
709
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n");
710
        return 6;
711
    }
712
    if (vorbis_parse_setup_hdr_modes(vc)) {
713
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n");
714
        return 7;
715
    }
716
    if (!get_bits1(gb)) {
717
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n");
718
        return 8; // framing flag bit unset error
719
    }
720

    
721
    return 0;
722
}
723

    
724
// Process the identification header
725

    
726
static int vorbis_parse_id_hdr(vorbis_context *vc){
727
    GetBitContext *gb=&vc->gb;
728
    uint_fast8_t bl0, bl1;
729
    const float *vwin[8]={ vwin64, vwin128, vwin256, vwin512, vwin1024, vwin2048, vwin4096, vwin8192 };
730

    
731
    if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') ||
732
    (get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') ||
733
    (get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) {
734
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n");
735
        return 1;
736
    }
737

    
738
    vc->version=get_bits_long_le(gb, 32);    //FIXME check 0
739
    vc->audio_channels=get_bits(gb, 8);   //FIXME check >0
740
    vc->audio_samplerate=get_bits_long_le(gb, 32);   //FIXME check >0
741
    vc->bitrate_maximum=get_bits_long_le(gb, 32);
742
    vc->bitrate_nominal=get_bits_long_le(gb, 32);
743
    vc->bitrate_minimum=get_bits_long_le(gb, 32);
744
    bl0=get_bits(gb, 4);
745
    bl1=get_bits(gb, 4);
746
    vc->blocksize_0=(1<<bl0);
747
    vc->blocksize_1=(1<<bl1);
748
    if (bl0>13 || bl0<6 || bl1>13 || bl1<6) {
749
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n");
750
        return 3;
751
    }
752
    vc->swin=vwin[bl0-6];
753
    vc->lwin=vwin[bl1-6];
754

    
755
    if ((get_bits1(gb)) == 0) {
756
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n");
757
        return 2;
758
    }
759

    
760
    vc->channel_residues=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
761
    vc->channel_floors=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
762
    vc->saved=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
763
    vc->ret=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
764
    vc->buf=(float *)av_malloc(vc->blocksize_1 * sizeof(float));
765
    vc->buf_tmp=(float *)av_malloc(vc->blocksize_1 * sizeof(float));
766
    vc->saved_start=0;
767

    
768
    ff_mdct_init(&vc->mdct0, bl0, 1);
769
    ff_mdct_init(&vc->mdct1, bl1, 1);
770

    
771
    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 ",
772
            vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize_0, vc->blocksize_1);
773

    
774
/*
775
    BLK=vc->blocksize_0;
776
    for(i=0;i<BLK/2;++i) {
777
        vc->swin[i]=sin(0.5*3.14159265358*(sin(((float)i+0.5)/(float)BLK*3.14159265358))*(sin(((float)i+0.5)/(float)BLK*3.14159265358)));
778
    }
779
*/
780

    
781
    return 0;
782
}
783

    
784
// Process the extradata using the functions above (identification header, setup header)
785

    
786
static int vorbis_decode_init(AVCodecContext *avccontext) {
787
    vorbis_context *vc = avccontext->priv_data ;
788
    uint8_t *headers = avccontext->extradata;
789
    int headers_len=avccontext->extradata_size;
790
    uint8_t *header_start[3];
791
    int header_len[3];
792
    GetBitContext *gb = &(vc->gb);
793
    int i, j, hdr_type;
794

    
795
    vc->avccontext = avccontext;
796

    
797
    if (!headers_len) {
798
        av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
799
        return -1;
800
    }
801

    
802
    if(headers[0] == 0 && headers[1] == 30) {
803
        for(i = 0; i < 3; i++){
804
            header_len[i] = *headers++ << 8;
805
            header_len[i] += *headers++;
806
            header_start[i] = headers;
807
            headers += header_len[i];
808
        }
809
    } else if(headers[0] == 2) {
810
        for(j=1,i=0;i<2;++i, ++j) {
811
            header_len[i]=0;
812
            while(j<headers_len && headers[j]==0xff) {
813
                header_len[i]+=0xff;
814
                ++j;
815
            }
816
            if (j>=headers_len) {
817
                av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
818
                return -1;
819
            }
820
            header_len[i]+=headers[j];
821
        }
822
        header_len[2]=headers_len-header_len[0]-header_len[1]-j;
823
        headers+=j;
824
        header_start[0] = headers;
825
        header_start[1] = header_start[0] + header_len[0];
826
        header_start[2] = header_start[1] + header_len[1];
827
    } else {
828
        av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
829
        return -1;
830
    }
831

    
832
    init_get_bits(gb, header_start[0], header_len[0]*8);
833
    hdr_type=get_bits(gb, 8);
834
    if (hdr_type!=1) {
835
        av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n");
836
        return -1;
837
    }
838
    if (vorbis_parse_id_hdr(vc)) {
839
        av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n");
840
        vorbis_free(vc);
841
        return -1;
842
    }
843

    
844
    init_get_bits(gb, header_start[2], header_len[2]*8);
845
    hdr_type=get_bits(gb, 8);
846
    if (hdr_type!=5) {
847
        av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");
848
        return -1;
849
    }
850
    if (vorbis_parse_setup_hdr(vc)) {
851
        av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");
852
        vorbis_free(vc);
853
        return -1;
854
    }
855

    
856
    avccontext->channels = vc->audio_channels;
857
    avccontext->sample_rate = vc->audio_samplerate;
858

    
859
    return 0 ;
860
}
861

    
862
// Decode audiopackets -------------------------------------------------
863

    
864
// Read and decode floor (type 1 only)
865

    
866
static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc, vorbis_floor *vf, float *vec) {
867
    GetBitContext *gb=&vc->gb;
868
    uint_fast16_t range_v[4]={ 256, 128, 86, 64 };
869
    uint_fast16_t range=range_v[vf->multiplier-1];
870
    uint_fast16_t floor1_Y[vf->x_list_dim];
871
    uint_fast16_t floor1_Y_final[vf->x_list_dim];
872
    uint_fast8_t floor1_flag[vf->x_list_dim];
873
    uint_fast8_t class_;
874
    uint_fast8_t cdim;
875
    uint_fast8_t cbits;
876
    uint_fast8_t csub;
877
    uint_fast8_t cval;
878
    int_fast16_t book;
879
    uint_fast16_t offset;
880
    uint_fast16_t i,j;
881
    uint_fast16_t *floor_x_sort=vf->x_list_order;
882
    /*u*/int_fast16_t adx, ady, off, predicted; // WTF ? dy/adx= (unsigned)dy/adx ?
883
    int_fast16_t dy, err;
884
    uint_fast16_t lx,hx, ly, hy=0;
885

    
886

    
887
    if (!get_bits1(gb)) return 1; // silence
888

    
889
// Read values (or differences) for the floor's points
890

    
891
    floor1_Y[0]=get_bits(gb, ilog(range-1));
892
    floor1_Y[1]=get_bits(gb, ilog(range-1));
893

    
894
    AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);
895

    
896
    offset=2;
897
    for(i=0;i<vf->partitions;++i) {
898
        class_=vf->partition_class[i];
899
        cdim=vf->class_dimensions[class_];
900
        cbits=vf->class_subclasses[class_];
901
        csub=(1<<cbits)-1;
902
        cval=0;
903

    
904
        AV_DEBUG("Cbits %d \n", cbits);
905

    
906
        if (cbits) { // this reads all subclasses for this partition's class
907
            cval=get_vlc2(gb, vc->codebooks[vf->class_masterbook[class_]].vlc.table,
908
            V_NB_BITS, vc->codebooks[vf->class_masterbook[class_]].maxdepth);
909
        }
910

    
911
        for(j=0;j<cdim;++j) {
912
            book=vf->subclass_books[class_][cval & csub];
913

    
914
            AV_DEBUG("book %d Cbits %d cval %d  bits:%d \n", book, cbits, cval, get_bits_count(gb));
915

    
916
            cval=cval>>cbits;
917
            if (book>0) {
918
                floor1_Y[offset+j]=get_vlc2(gb, vc->codebooks[book].vlc.table,
919
                V_NB_BITS, vc->codebooks[book].maxdepth);
920
            } else {
921
                floor1_Y[offset+j]=0;
922
            }
923

    
924
            AV_DEBUG(" floor(%d) = %d \n", vf->x_list[offset+j], floor1_Y[offset+j]);
925
        }
926
        offset+=cdim;
927
    }
928

    
929
// Amplitude calculation from the differences
930

    
931
    floor1_flag[0]=1;
932
    floor1_flag[1]=1;
933
    floor1_Y_final[0]=floor1_Y[0];
934
    floor1_Y_final[1]=floor1_Y[1];
935

    
936
    for(i=2;i<vf->x_list_dim;++i) {
937
        uint_fast16_t val, highroom, lowroom, room;
938
        uint_fast16_t high_neigh_offs;
939
        uint_fast16_t low_neigh_offs;
940

    
941
        low_neigh_offs=vf->low_neighbour[i];
942
        high_neigh_offs=vf->high_neighbour[i];
943
        dy=floor1_Y_final[high_neigh_offs]-floor1_Y_final[low_neigh_offs];  // render_point begin
944
        adx=vf->x_list[high_neigh_offs]-vf->x_list[low_neigh_offs];
945
        ady= ABS(dy);
946
        err=ady*(vf->x_list[i]-vf->x_list[low_neigh_offs]);
947
        off=err/adx;
948
        if (dy<0) {
949
            predicted=floor1_Y_final[low_neigh_offs]-off;
950
        } else {
951
            predicted=floor1_Y_final[low_neigh_offs]+off;
952
        } // render_point end
953

    
954
        val=floor1_Y[i];
955
        highroom=range-predicted;
956
        lowroom=predicted;
957
        if (highroom < lowroom) {
958
            room=highroom*2;
959
        } else {
960
            room=lowroom*2;   // SPEC mispelling
961
        }
962
        if (val) {
963
            floor1_flag[low_neigh_offs]=1;
964
            floor1_flag[high_neigh_offs]=1;
965
            floor1_flag[i]=1;
966
            if (val>=room) {
967
                if (highroom > lowroom) {
968
                    floor1_Y_final[i]=val-lowroom+predicted;
969
                } else {
970
                    floor1_Y_final[i]=predicted-val+highroom-1;
971
                }
972
            } else {
973
                if (val & 1) {
974
                    floor1_Y_final[i]=predicted-(val+1)/2;
975
                } else {
976
                    floor1_Y_final[i]=predicted+val/2;
977
                }
978
            }
979
        } else {
980
            floor1_flag[i]=0;
981
            floor1_Y_final[i]=predicted;
982
        }
983

    
984
        AV_DEBUG(" Decoded floor(%d) = %d / val %d \n", vf->x_list[i], floor1_Y_final[i], val);
985
    }
986

    
987
// Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?
988

    
989
    hx=0;
990
    lx=0;
991
    ly=floor1_Y_final[0]*vf->multiplier;  // conforms to SPEC
992

    
993
    vec[0]=floor1_inverse_db_table[ly];
994

    
995
    for(i=1;i<vf->x_list_dim;++i) {
996
        AV_DEBUG(" Looking at post %d \n", i);
997

    
998
        if (floor1_flag[floor_x_sort[i]]) {   // SPEC mispelled
999
            int_fast16_t x, y, dy, base, sy; // if uncommented: dy = -32 adx = 2  base = 2blablabla ?????
1000

    
1001
            hy=floor1_Y_final[floor_x_sort[i]]*vf->multiplier;
1002
            hx=vf->x_list[floor_x_sort[i]];
1003

    
1004
            dy=hy-ly;
1005
            adx=hx-lx;
1006
            ady= (dy<0) ? -dy:dy;//ABS(dy);
1007
            base=dy/adx;
1008

    
1009
            AV_DEBUG(" dy %d  adx %d base %d = %d \n", dy, adx, base, dy/adx);
1010

    
1011
            x=lx;
1012
            y=ly;
1013
            err=0;
1014
            if (dy<0) {
1015
                sy=base-1;
1016
            } else {
1017
                sy=base+1;
1018
            }
1019
            ady=ady-(base<0 ? -base : base)*adx;
1020
            vec[x]=floor1_inverse_db_table[y];
1021

    
1022
            AV_DEBUG(" vec[ %d ] = %d \n", x, y);
1023

    
1024
            for(x=lx+1;(x<hx) && (x<vf->x_list[1]);++x) {
1025
                err+=ady;
1026
                if (err>=adx) {
1027
                    err-=adx;
1028
                    y+=sy;
1029
                } else {
1030
                    y+=base;
1031
                }
1032
                vec[x]=floor1_inverse_db_table[y];
1033

    
1034
                AV_DEBUG(" vec[ %d ] = %d \n", x, y);
1035
            }
1036

    
1037
/*            for(j=1;j<hx-lx+1;++j) {  // iterating render_point
1038
                dy=hy-ly;
1039
                adx=hx-lx;
1040
                ady= dy<0 ? -dy : dy;
1041
                err=ady*j;
1042
                off=err/adx;
1043
                if (dy<0) {
1044
                    predicted=ly-off;
1045
                } else {
1046
                    predicted=ly+off;
1047
                }
1048
                if (lx+j < vf->x_list[1]) {
1049
                    vec[lx+j]=floor1_inverse_db_table[predicted];
1050
                }
1051
            }*/
1052

    
1053
            lx=hx;
1054
            ly=hy;
1055
        }
1056
    }
1057

    
1058
    if (hx<vf->x_list[1]) {
1059
        for(i=hx;i<vf->x_list[1];++i) {
1060
            vec[i]=floor1_inverse_db_table[hy];
1061
        }
1062
    }
1063

    
1064
    AV_DEBUG(" Floor decoded\n");
1065

    
1066
    return 0;
1067
}
1068

    
1069
// Read and decode residue
1070

    
1071
static int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr, uint_fast8_t ch, uint_fast8_t *do_not_decode, float *vec, uint_fast16_t vlen) {
1072
    GetBitContext *gb=&vc->gb;
1073
    uint_fast8_t c_p_c=vc->codebooks[vr->classbook].dimensions;
1074
    uint_fast16_t n_to_read=vr->end-vr->begin;
1075
    uint_fast16_t ptns_to_read=n_to_read/vr->partition_size;
1076
    uint_fast8_t classifs[ptns_to_read*vc->audio_channels];
1077
    uint_fast8_t pass;
1078
    uint_fast8_t ch_used;
1079
    uint_fast8_t i,j,l;
1080
    uint_fast16_t k;
1081

    
1082
    if (vr->type==2) {
1083
        for(j=1;j<ch;++j) {
1084
                do_not_decode[0]&=do_not_decode[j];  // FIXME - clobbering input
1085
        }
1086
        if (do_not_decode[0]) return 0;
1087
        ch_used=1;
1088
    } else {
1089
        ch_used=ch;
1090
    }
1091

    
1092
    AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);
1093

    
1094
    for(pass=0;pass<=vr->maxpass;++pass) { // FIXME OPTIMIZE?
1095
        uint_fast16_t voffset;
1096
        uint_fast16_t partition_count;
1097
        uint_fast16_t j_times_ptns_to_read;
1098

    
1099
        voffset=vr->begin;
1100
        for(partition_count=0;partition_count<ptns_to_read;) {  // SPEC        error
1101
            if (!pass) {
1102
                for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {
1103
                    if (!do_not_decode[j]) {
1104
                        uint_fast32_t temp=get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,
1105
                        V_NB_BITS, vc->codebooks[vr->classbook].maxdepth);
1106

    
1107
                        AV_DEBUG("Classword: %d \n", temp);
1108

    
1109
                        for(i=0;i<c_p_c;++i) {
1110
                            uint_fast32_t temp2;
1111

    
1112
                            temp2=temp/vr->classifications;
1113
                            classifs[j_times_ptns_to_read+partition_count+c_p_c-1-i]=temp-temp2*vr->classifications;
1114
                            temp=temp2;
1115
                        }
1116
                    }
1117
                    j_times_ptns_to_read+=ptns_to_read;
1118
                }
1119
            }
1120
            for(i=0;(i<c_p_c) && (partition_count<ptns_to_read);++i) {
1121
                for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {
1122
                    uint_fast16_t voffs;
1123

    
1124
                    if (!do_not_decode[j]) {
1125
                        uint_fast8_t vqclass=classifs[j_times_ptns_to_read+partition_count];
1126
                        int_fast16_t vqbook=vr->books[vqclass][pass];
1127

    
1128
                        if (vqbook>=0) {
1129
                            uint_fast16_t coffs;
1130

    
1131
                            if (vr->type==0) {
1132
                                uint_fast16_t step=vr->partition_size/vc->codebooks[vqbook].dimensions;
1133

    
1134
                                voffs=voffset+j*vlen;
1135
                                for(k=0;k<step;++k) {
1136
                                    coffs=get_vlc2(gb, vc->codebooks[vqbook].vlc.table,
1137
                                    V_NB_BITS, vc->codebooks[vr->classbook].maxdepth) * vc->codebooks[vqbook].dimensions;
1138
                                    for(l=0;l<vc->codebooks[vqbook].dimensions;++l) {
1139
                                        vec[voffs+k+l*step]+=vc->codebooks[vqbook].codevectors[coffs+l];  // FPMATH
1140
                                    }
1141
                                }
1142
                            }
1143
                            else if (vr->type==1) {
1144
                                voffs=voffset+j*vlen;
1145
                                for(k=0;k<vr->partition_size/vc->codebooks[vqbook].dimensions;++k) {
1146
                                    coffs=get_vlc2(gb, vc->codebooks[vqbook].vlc.table,
1147
                                    V_NB_BITS, vc->codebooks[vr->classbook].maxdepth) * vc->codebooks[vqbook].dimensions;
1148
                                    for(l=0;l<vc->codebooks[vqbook].dimensions;++l, ++voffs) {
1149
                                        vec[voffs]+=vc->codebooks[vqbook].codevectors[coffs+l];  // FPMATH
1150

    
1151
                                        AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d  \n", pass, voffs, vec[voffs], vc->codebooks[vqbook].codevectors[coffs+l], coffs);
1152
                                    }
1153
                                }
1154
                            }
1155
                            else if (vr->type==2 && ch==2) { // most frequent case optimized
1156
                                voffs=voffset;
1157

    
1158
                                for(k=0;k<vr->partition_size/vc->codebooks[vqbook].dimensions;++k) {
1159
                                    coffs=get_vlc2(gb, vc->codebooks[vqbook].vlc.table,
1160
                                    V_NB_BITS, vc->codebooks[vr->classbook].maxdepth) * vc->codebooks[vqbook].dimensions;
1161
                                    for(l=0;l<vc->codebooks[vqbook].dimensions;++l, ++voffs) {
1162
                                        vec[(voffs>>1)+((voffs&1) ? vlen : 0)]+=vc->codebooks[vqbook].codevectors[coffs+l];  // FPMATH
1163

    
1164
                                        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], vc->codebooks[vqbook].codevectors[coffs+l], coffs, l);
1165
                                    }
1166
                                }
1167

    
1168
                            }
1169
                            else if (vr->type==2) {
1170
                                voffs=voffset;
1171

    
1172
                                for(k=0;k<vr->partition_size/vc->codebooks[vqbook].dimensions;++k) {
1173
                                    coffs=get_vlc2(gb, vc->codebooks[vqbook].vlc.table,
1174
                                    V_NB_BITS, vc->codebooks[vr->classbook].maxdepth) * vc->codebooks[vqbook].dimensions;
1175
                                    for(l=0;l<vc->codebooks[vqbook].dimensions;++l, ++voffs) {
1176
                                        vec[voffs/ch+(voffs%ch)*vlen]+=vc->codebooks[vqbook].codevectors[coffs+l];  // FPMATH FIXME use if and counter instead of / and %
1177

    
1178
                                        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], vc->codebooks[vqbook].codevectors[coffs+l], coffs, l);
1179
                                    }
1180
                                }
1181
                            } else {
1182
                                av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");
1183
                                return 1;
1184
                            }
1185
                        }
1186
                    }
1187
                    j_times_ptns_to_read+=ptns_to_read;
1188
                }
1189
                ++partition_count;
1190
                voffset+=vr->partition_size;
1191
            }
1192
        }
1193
    }
1194
    return 0;
1195
}
1196

    
1197
// Decode the audio packet using the functions above
1198

    
1199
static int vorbis_parse_audio_packet(vorbis_context *vc) {
1200
    GetBitContext *gb=&vc->gb;
1201

    
1202
    uint_fast8_t previous_window=0,next_window=0;
1203
    uint_fast8_t mode_number;
1204
    uint_fast16_t blocksize;
1205
    int_fast32_t i,j;
1206
    uint_fast8_t no_residue[vc->audio_channels];
1207
    uint_fast8_t do_not_decode[vc->audio_channels];
1208
    vorbis_mapping *mapping;
1209
    float *ch_res_ptr=vc->channel_residues;
1210
    float *ch_floor_ptr=vc->channel_floors;
1211
    uint_fast8_t res_chan[vc->audio_channels];
1212
    uint_fast8_t res_num=0;
1213
    int_fast16_t retlen=0;
1214
    uint_fast16_t saved_start=0;
1215

    
1216
    if (get_bits1(gb)) {
1217
        av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");
1218
        return -1; // packet type not audio
1219
    }
1220

    
1221
    if (vc->mode_count==1) {
1222
        mode_number=0;
1223
    } else {
1224
        mode_number=get_bits(gb, ilog(vc->mode_count-1));
1225
    }
1226
    mapping=&vc->mappings[vc->modes[mode_number].mapping];
1227

    
1228
    AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);
1229

    
1230
    if (vc->modes[mode_number].blockflag) {
1231
        previous_window=get_bits1(gb);
1232
        next_window=get_bits1(gb);
1233
    }
1234

    
1235
    blocksize=vc->modes[mode_number].blockflag ? vc->blocksize_1 : vc->blocksize_0;
1236
    memset(ch_res_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?
1237
    memset(ch_floor_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?
1238

    
1239
// Decode floor(1)
1240

    
1241
    for(i=0;i<vc->audio_channels;++i) {
1242
        vorbis_floor *floor;
1243
        if (mapping->submaps>1) {
1244
            floor=&vc->floors[mapping->submap_floor[mapping->mux[i]]];
1245
        } else {
1246
            floor=&vc->floors[mapping->submap_floor[0]];
1247
        }
1248

    
1249
        no_residue[i]=vorbis_floor1_decode(vc, floor, ch_floor_ptr);
1250
        ch_floor_ptr+=blocksize/2;
1251
    }
1252

    
1253
// Nonzero vector propagate
1254

    
1255
    for(i=mapping->coupling_steps-1;i>=0;--i) {
1256
        if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {
1257
            no_residue[mapping->magnitude[i]]=0;
1258
            no_residue[mapping->angle[i]]=0;
1259
        }
1260
    }
1261

    
1262
// Decode residue
1263

    
1264
    for(i=0;i<mapping->submaps;++i) {
1265
        vorbis_residue *residue;
1266
        uint_fast8_t ch=0;
1267

    
1268
        for(j=0;j<vc->audio_channels;++j) {
1269
            if ((mapping->submaps==1) || (i=mapping->mux[j])) {
1270
                res_chan[j]=res_num;
1271
                if (no_residue[j]) {
1272
                    do_not_decode[ch]=1;
1273
                } else {
1274
                    do_not_decode[ch]=0;
1275
                }
1276
                ++ch;
1277
                ++res_num;
1278
            }
1279
        }
1280
        residue=&vc->residues[mapping->submap_residue[i]];
1281
        vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);
1282

    
1283
        ch_res_ptr+=ch*blocksize/2;
1284
    }
1285

    
1286
// Inverse coupling
1287

    
1288
    for(i=mapping->coupling_steps-1;i>=0;--i) { //warning: i has to be signed
1289
        float *mag, *ang;
1290

    
1291
        mag=vc->channel_residues+res_chan[mapping->magnitude[i]]*blocksize/2;
1292
        ang=vc->channel_residues+res_chan[mapping->angle[i]]*blocksize/2;
1293
        for(j=0;j<blocksize/2;++j) {
1294
            float temp;
1295
            if (mag[j]>0.0) {
1296
                if (ang[j]>0.0) {
1297
                    ang[j]=mag[j]-ang[j];
1298
                } else {
1299
                    temp=ang[j];
1300
                    ang[j]=mag[j];
1301
                    mag[j]+=temp;
1302
                }
1303
            } else {
1304
                if (ang[j]>0.0) {
1305
                    ang[j]+=mag[j];
1306
                } else {
1307
                    temp=ang[j];
1308
                    ang[j]=mag[j];
1309
                    mag[j]-=temp;
1310
                }
1311
            }
1312
        }
1313
    }
1314

    
1315
// Dotproduct
1316

    
1317
    for(j=0, ch_floor_ptr=vc->channel_floors;j<vc->audio_channels;++j,ch_floor_ptr+=blocksize/2) {
1318
        ch_res_ptr=vc->channel_residues+res_chan[j]*blocksize/2;
1319

    
1320
        for(i=0;i<blocksize/2;++i) {
1321
            ch_floor_ptr[i]*=ch_res_ptr[i]; //FPMATH
1322
        }
1323
    }
1324

    
1325
// MDCT, overlap/add, save data for next overlapping  FPMATH
1326

    
1327
    for(j=0;j<vc->audio_channels;++j) {
1328
        uint_fast8_t step=vc->audio_channels;
1329
        uint_fast16_t k;
1330
        float *saved=vc->saved+j*vc->blocksize_1/2;
1331
        float *ret=vc->ret;
1332
        const float *lwin=vc->lwin;
1333
        const float *swin=vc->swin;
1334
        float *buf=vc->buf;
1335
        float *buf_tmp=vc->buf_tmp;
1336

    
1337
        ch_floor_ptr=vc->channel_floors+j*blocksize/2;
1338

    
1339
        saved_start=vc->saved_start;
1340

    
1341
        ff_imdct_calc(vc->modes[mode_number].blockflag ? &vc->mdct1 : &vc->mdct0, buf, ch_floor_ptr, buf_tmp);
1342

    
1343
        if (vc->modes[mode_number].blockflag) {
1344
            // -- overlap/add
1345
            if (previous_window) {
1346
                for(k=j, i=0;i<vc->blocksize_1/2;++i, k+=step) {
1347
                    ret[k]=saved[i]+buf[i]*lwin[i];
1348
                }
1349
                retlen=vc->blocksize_1/2;
1350
            } else {
1351
                for(k=j, i=0;i<vc->blocksize_0/2;++i, k+=step) {
1352
                    ret[k]=saved[i]+buf[(vc->blocksize_1-vc->blocksize_0)/4+i]*swin[i];
1353
                }
1354
                for(i=0;i<(vc->blocksize_1-vc->blocksize_0)/4;++i, k+=step) {
1355
                    ret[k]=buf[vc->blocksize_0/2+(vc->blocksize_1-vc->blocksize_0)/4+i];
1356
                }
1357
                retlen=vc->blocksize_0/2+(vc->blocksize_1-vc->blocksize_0)/4;
1358
            }
1359
            // -- save
1360
            if (next_window) {
1361
                for(i=0;i<vc->blocksize_1/2;++i) {
1362
                    saved[i]=buf[vc->blocksize_1/2+i]*lwin[vc->blocksize_1/2-1-i];
1363
                }
1364
                saved_start=0;
1365
            } else {
1366
                saved_start=(vc->blocksize_1-vc->blocksize_0)/4;
1367
                for(i=0;i<saved_start;++i) {
1368
                    saved[i]=buf[vc->blocksize_1/2+i];
1369
                }
1370
                for(i=0;i<vc->blocksize_0/2;++i) {
1371
                    saved[saved_start+i]=buf[vc->blocksize_1/2+saved_start+i]*swin[vc->blocksize_0/2-1-i];
1372
                }
1373
            }
1374
        } else {
1375
            // --overlap/add
1376
            for(k=j, i=0;i<saved_start;++i, k+=step) {
1377
                ret[k]=saved[i];
1378
            }
1379
            for(i=0;i<vc->blocksize_0/2;++i, k+=step) {
1380
                ret[k]=saved[saved_start+i]+buf[i]*swin[i];
1381
            }
1382
            retlen=saved_start+vc->blocksize_0/2;
1383
            // -- save
1384
            for(i=0;i<vc->blocksize_0/2;++i) {
1385
                saved[i]=buf[vc->blocksize_0/2+i]*swin[vc->blocksize_0/2-1-i];
1386
            }
1387
            saved_start=0;
1388
        }
1389
    }
1390
    vc->saved_start=saved_start;
1391

    
1392
    return retlen*vc->audio_channels;
1393
}
1394

    
1395
// Return the decoded audio packet through the standard api
1396

    
1397
static int vorbis_decode_frame(AVCodecContext *avccontext,
1398
                        void *data, int *data_size,
1399
                        uint8_t *buf, int buf_size)
1400
{
1401
    vorbis_context *vc = avccontext->priv_data ;
1402
    GetBitContext *gb = &(vc->gb);
1403

    
1404
    int_fast16_t i, len;
1405

    
1406
    if(!buf_size){
1407
        return 0;
1408
    }
1409

    
1410
    AV_DEBUG("packet length %d \n", buf_size);
1411

    
1412
    init_get_bits(gb, buf, buf_size*8);
1413

    
1414
    len=vorbis_parse_audio_packet(vc);
1415

    
1416
    if (len<=0) {
1417
        *data_size=0;
1418
        return buf_size;
1419
    }
1420

    
1421
    if (!vc->first_frame) {
1422
        vc->first_frame=1;
1423
        *data_size=0;
1424
        return buf_size ;
1425
    }
1426

    
1427
    AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);
1428

    
1429
    for(i=0;i<len;++i) {
1430
        int_fast32_t tmp;
1431

    
1432
        tmp=vc->ret[i]*32768;
1433
        if (tmp>32767) tmp=32767;
1434
        if (tmp<-32768) tmp=-32768;
1435
        ((int16_t*)data)[i]=tmp;
1436
    }
1437
    *data_size=len*2;
1438

    
1439
    return buf_size ;
1440
}
1441

    
1442
// Close decoder
1443

    
1444
static int vorbis_decode_close(AVCodecContext *avccontext) {
1445
    vorbis_context *vc = avccontext->priv_data;
1446

    
1447
    vorbis_free(vc);
1448

    
1449
    return 0 ;
1450
}
1451

    
1452
AVCodec vorbis_decoder = {
1453
    "vorbis",
1454
    CODEC_TYPE_AUDIO,
1455
    CODEC_ID_VORBIS,
1456
    sizeof(vorbis_context),
1457
    vorbis_decode_init,
1458
    NULL,
1459
    vorbis_decode_close,
1460
    vorbis_decode_frame,
1461
};
1462