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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19
 *
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 8
34
#define V_NB_BITS2 11
35
#define V_MAX_VLCS (1<<16)
36

    
37
#ifndef V_DEBUG
38
#define AV_DEBUG(...)
39
#endif
40

    
41
#undef NDEBUG
42
#include <assert.h>
43

    
44
/* Helper functions */
45

    
46
/**
47
 *  reads 0-32 bits when using the ALT_BITSTREAM_READER_LE bitstream reader
48
 */
49
unsigned int get_bits_long_le(GetBitContext *s, int n){
50
    if(n<=17) return get_bits(s, n);
51
    else{
52
        int ret= get_bits(s, 16);
53
        return ret | (get_bits(s, n-16) << 16);
54
    }
55
}
56

    
57
#define ilog(i) av_log2(2*(i))
58

    
59
static unsigned int nth_root(unsigned int x, unsigned int n) {   // x^(1/n)
60
    unsigned int ret=0, i, j;
61

    
62
    do {
63
        ++ret;
64
        for(i=0,j=ret;i<n-1;i++) j*=ret;
65
    } while (j<=x);
66

    
67
    return (ret-1);
68
}
69

    
70
static float vorbisfloat2float(uint_fast32_t val) {
71
    double mant=val&0x1fffff;
72
    long exp=(val&0x7fe00000L)>>21;
73
    if (val&0x80000000) mant=-mant;
74
    return(ldexp(mant, exp-20-768));
75
}
76

    
77

    
78
// Generate vlc codes from vorbis huffman code lengths
79

    
80
static int vorbis_len2vlc(vorbis_context *vc, uint_fast8_t *bits, uint_fast32_t *codes, uint_fast32_t num) {
81
    uint_fast32_t exit_at_level[33]={404,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
82
        0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
83

    
84
    uint_fast8_t i,j;
85
    uint_fast32_t code,p;
86

    
87
#ifdef V_DEBUG
88
    GetBitContext gb;
89
#endif
90

    
91
    for(p=0;(bits[p]==0) && (p<num);++p);
92
    if (p==num) {
93
//        av_log(vc->avccontext, AV_LOG_INFO, "An empty codebook. Heh?! \n");
94
        return 0;
95
    }
96

    
97
    codes[p]=0;
98
    for(i=0;i<bits[p];++i) {
99
        exit_at_level[i+1]=1<<i;
100
    }
101

    
102
#ifdef V_DEBUG
103
    av_log(vc->avccontext, AV_LOG_INFO, " %d. of %d code len %d code %d - ", p, num, bits[p], codes[p]);
104
    init_get_bits(&gb, (uint_fast8_t *)&codes[p], bits[p]);
105
    for(i=0;i<bits[p];++i) {
106
        av_log(vc->avccontext, AV_LOG_INFO, "%s", get_bits1(&gb) ? "1" : "0");
107
    }
108
    av_log(vc->avccontext, AV_LOG_INFO, "\n");
109
#endif
110

    
111
    ++p;
112

    
113
    for(;p<num;++p) {
114
        if (bits[p]==0) continue;
115
        // find corresponding exit(node which the tree can grow further from)
116
        for(i=bits[p];i>0;--i) {
117
            if (exit_at_level[i]) break;
118
        }
119
        if (!i) return 1; // overspecified tree
120
        code=exit_at_level[i];
121
        exit_at_level[i]=0;
122
        // construct code (append 0s to end) and introduce new exits
123
        for(j=i+1;j<=bits[p];++j) {
124
            exit_at_level[j]=code+(1<<(j-1));
125
        }
126
        codes[p]=code;
127

    
128
#ifdef V_DEBUG
129
        av_log(vc->avccontext, AV_LOG_INFO, " %d. code len %d code %d - ", p, bits[p], codes[p]);
130
        init_get_bits(&gb, (uint_fast8_t *)&codes[p], bits[p]);
131
        for(i=0;i<bits[p];++i) {
132
            av_log(vc->avccontext, AV_LOG_INFO, "%s", get_bits1(&gb) ? "1" : "0");
133
        }
134
        av_log(vc->avccontext, AV_LOG_INFO, "\n");
135
#endif
136

    
137
    }
138

    
139
    //FIXME no exits should be left (underspecified tree - ie. unused valid vlcs - not allowed by SPEC)
140

    
141
    return 0;
142
}
143

    
144
// Free all allocated memory -----------------------------------------
145

    
146
static void vorbis_free(vorbis_context *vc) {
147
    int_fast16_t i;
148

    
149
    av_freep(&vc->channel_residues);
150
    av_freep(&vc->channel_floors);
151
    av_freep(&vc->saved);
152
    av_freep(&vc->ret);
153
    av_freep(&vc->buf);
154
    av_freep(&vc->buf_tmp);
155

    
156
    av_freep(&vc->residues);
157
    av_freep(&vc->modes);
158

    
159
    ff_mdct_end(&vc->mdct0);
160
    ff_mdct_end(&vc->mdct1);
161

    
162
    for(i=0;i<vc->codebook_count;++i) {
163
        av_free(vc->codebooks[i].codevectors);
164
        free_vlc(&vc->codebooks[i].vlc);
165
    }
166
    av_freep(&vc->codebooks);
167

    
168
    for(i=0;i<vc->floor_count;++i) {
169
        av_free(vc->floors[i].x_list);
170
        av_free(vc->floors[i].x_list_order);
171
        av_free(vc->floors[i].low_neighbour);
172
        av_free(vc->floors[i].high_neighbour);
173
    }
174
    av_freep(&vc->floors);
175

    
176
    for(i=0;i<vc->mapping_count;++i) {
177
        av_free(vc->mappings[i].magnitude);
178
        av_free(vc->mappings[i].angle);
179
        av_free(vc->mappings[i].mux);
180
    }
181
    av_freep(&vc->mappings);
182
}
183

    
184
// Parse setup header -------------------------------------------------
185

    
186
// Process codebooks part
187

    
188
static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc) {
189
    uint_fast16_t cb;
190
    uint_fast8_t *tmp_vlc_bits;
191
    uint_fast32_t *tmp_vlc_codes;
192
    GetBitContext *gb=&vc->gb;
193

    
194
    vc->codebook_count=get_bits(gb,8)+1;
195

    
196
    AV_DEBUG(" Codebooks: %d \n", vc->codebook_count);
197

    
198
    vc->codebooks=(vorbis_codebook *)av_mallocz(vc->codebook_count * sizeof(vorbis_codebook));
199
    tmp_vlc_bits=(uint_fast8_t *)av_mallocz(V_MAX_VLCS * sizeof(uint_fast8_t));
200
    tmp_vlc_codes=(uint_fast32_t *)av_mallocz(V_MAX_VLCS * sizeof(uint_fast32_t));
201

    
202
    for(cb=0;cb<vc->codebook_count;++cb) {
203
        vorbis_codebook *codebook_setup=&vc->codebooks[cb];
204
        uint_fast8_t ordered;
205
        uint_fast32_t t, used_entries=0;
206
        uint_fast32_t entries;
207

    
208
        AV_DEBUG(" %d. Codebook \n", cb);
209

    
210
        if (get_bits(gb, 24)!=0x564342) {
211
            av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook setup data corrupt. \n", cb);
212
            goto error;
213
        }
214

    
215
        codebook_setup->dimensions=get_bits(gb, 16);
216
        if (codebook_setup->dimensions>16) {
217
            av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook's dimension is too large (%d). \n", cb, codebook_setup->dimensions);
218
            goto error;
219
        }
220
        entries=get_bits(gb, 24);
221
        if (entries>V_MAX_VLCS) {
222
            av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook has too many entries (%"PRIdFAST32"). \n", cb, entries);
223
            goto error;
224
        }
225

    
226
        ordered=get_bits1(gb);
227

    
228
        AV_DEBUG(" codebook_dimensions %d, codebook_entries %d \n", codebook_setup->dimensions, entries);
229

    
230
        if (!ordered) {
231
            uint_fast16_t ce;
232
            uint_fast8_t flag;
233
            uint_fast8_t sparse=get_bits1(gb);
234

    
235
            AV_DEBUG(" not ordered \n");
236

    
237
            if (sparse) {
238
                AV_DEBUG(" sparse \n");
239

    
240
                used_entries=0;
241
                for(ce=0;ce<entries;++ce) {
242
                    flag=get_bits1(gb);
243
                    if (flag) {
244
                        tmp_vlc_bits[ce]=get_bits(gb, 5)+1;
245
                        ++used_entries;
246
                    }
247
                    else tmp_vlc_bits[ce]=0;
248
                }
249
            } else {
250
                AV_DEBUG(" not sparse \n");
251

    
252
                used_entries=entries;
253
                for(ce=0;ce<entries;++ce) {
254
                    tmp_vlc_bits[ce]=get_bits(gb, 5)+1;
255
                }
256
            }
257
        } else {
258
            uint_fast16_t current_entry=0;
259
            uint_fast8_t current_length=get_bits(gb, 5)+1;
260

    
261
            AV_DEBUG(" ordered, current length: %d \n", current_length);  //FIXME
262

    
263
            used_entries=entries;
264
            for(;current_entry<used_entries;++current_length) {
265
                uint_fast16_t i, number;
266

    
267
                AV_DEBUG(" number bits: %d ", ilog(entries - current_entry));
268

    
269
                number=get_bits(gb, ilog(entries - current_entry));
270

    
271
                AV_DEBUG(" number: %d \n", number);
272

    
273
                for(i=current_entry;i<number+current_entry;++i) {
274
                    if (i<used_entries) tmp_vlc_bits[i]=current_length;
275
                }
276

    
277
                current_entry+=number;
278
            }
279
            if (current_entry>used_entries) {
280
                av_log(vc->avccontext, AV_LOG_ERROR, " More codelengths than codes in codebook. \n");
281
                goto error;
282
            }
283
        }
284

    
285
        codebook_setup->lookup_type=get_bits(gb, 4);
286

    
287
        AV_DEBUG(" lookup type: %d : %s \n", codebook_setup->lookup_type, codebook_setup->lookup_type ? "vq" : "no lookup" );
288

    
289
// If the codebook is used for (inverse) VQ, calculate codevectors.
290

    
291
        if (codebook_setup->lookup_type==1) {
292
            uint_fast16_t i, j, k;
293
            uint_fast16_t codebook_lookup_values=nth_root(entries, codebook_setup->dimensions);
294
            uint_fast16_t codebook_multiplicands[codebook_lookup_values];
295

    
296
            float codebook_minimum_value=vorbisfloat2float(get_bits_long_le(gb, 32));
297
            float codebook_delta_value=vorbisfloat2float(get_bits_long_le(gb, 32));
298
            uint_fast8_t codebook_value_bits=get_bits(gb, 4)+1;
299
            uint_fast8_t codebook_sequence_p=get_bits1(gb);
300

    
301
            AV_DEBUG(" We expect %d numbers for building the codevectors. \n", codebook_lookup_values);
302
            AV_DEBUG("  delta %f minmum %f \n", codebook_delta_value, codebook_minimum_value);
303

    
304
            for(i=0;i<codebook_lookup_values;++i) {
305
                codebook_multiplicands[i]=get_bits(gb, codebook_value_bits);
306

    
307
                AV_DEBUG(" multiplicands*delta+minmum : %e \n", (float)codebook_multiplicands[i]*codebook_delta_value+codebook_minimum_value);
308
                AV_DEBUG(" multiplicand %d \n", codebook_multiplicands[i]);
309
            }
310

    
311
// Weed out unused vlcs and build codevector vector
312
            codebook_setup->codevectors=(float *)av_mallocz(used_entries*codebook_setup->dimensions * sizeof(float));
313
            for(j=0, i=0;i<entries;++i) {
314
                uint_fast8_t dim=codebook_setup->dimensions;
315

    
316
                if (tmp_vlc_bits[i]) {
317
                    float last=0.0;
318
                    uint_fast32_t lookup_offset=i;
319

    
320
#ifdef V_DEBUG
321
                    av_log(vc->avccontext, AV_LOG_INFO, "Lookup offset %d ,", i);
322
#endif
323

    
324
                    for(k=0;k<dim;++k) {
325
                        uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values;
326
                        codebook_setup->codevectors[j*dim+k]=codebook_multiplicands[multiplicand_offset]*codebook_delta_value+codebook_minimum_value+last;
327
                        if (codebook_sequence_p) {
328
                            last=codebook_setup->codevectors[j*dim+k];
329
                        }
330
                        lookup_offset/=codebook_lookup_values;
331
                    }
332
                    tmp_vlc_bits[j]=tmp_vlc_bits[i];
333

    
334
#ifdef V_DEBUG
335
                    av_log(vc->avccontext, AV_LOG_INFO, "real lookup offset %d, vector: ", j);
336
                    for(k=0;k<dim;++k) {
337
                        av_log(vc->avccontext, AV_LOG_INFO, " %f ", codebook_setup->codevectors[j*dim+k]);
338
                    }
339
                    av_log(vc->avccontext, AV_LOG_INFO, "\n");
340
#endif
341

    
342
                    ++j;
343
                }
344
            }
345
            if (j!=used_entries) {
346
                av_log(vc->avccontext, AV_LOG_ERROR, "Bug in codevector vector building code. \n");
347
                goto error;
348
            }
349
            entries=used_entries;
350
        }
351
        else if (codebook_setup->lookup_type>=2) {
352
            av_log(vc->avccontext, AV_LOG_ERROR, "Codebook lookup type not supported. \n");
353
            goto error;
354
        }
355

    
356
// Initialize VLC table
357
        if (vorbis_len2vlc(vc, tmp_vlc_bits, tmp_vlc_codes, entries)) {
358
            av_log(vc->avccontext, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");
359
            goto error;
360
        }
361
        codebook_setup->maxdepth=0;
362
        for(t=0;t<entries;++t)
363
            if (tmp_vlc_bits[t]>=codebook_setup->maxdepth) codebook_setup->maxdepth=tmp_vlc_bits[t];
364

    
365
        if(codebook_setup->maxdepth > 3*V_NB_BITS) codebook_setup->nb_bits=V_NB_BITS2;
366
        else                                       codebook_setup->nb_bits=V_NB_BITS;
367

    
368
        codebook_setup->maxdepth=(codebook_setup->maxdepth+codebook_setup->nb_bits-1)/codebook_setup->nb_bits;
369

    
370
        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)) {
371
            av_log(vc->avccontext, AV_LOG_ERROR, " Error generating vlc tables. \n");
372
            goto error;
373
        }
374
    }
375

    
376
    av_free(tmp_vlc_bits);
377
    av_free(tmp_vlc_codes);
378
    return 0;
379

    
380
// Error:
381
error:
382
    av_free(tmp_vlc_bits);
383
    av_free(tmp_vlc_codes);
384
    return 1;
385
}
386

    
387
// Process time domain transforms part (unused in Vorbis I)
388

    
389
static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc) {
390
    GetBitContext *gb=&vc->gb;
391
    uint_fast8_t i;
392
    uint_fast8_t vorbis_time_count=get_bits(gb, 6)+1;
393

    
394
    for(i=0;i<vorbis_time_count;++i) {
395
        uint_fast16_t vorbis_tdtransform=get_bits(gb, 16);
396

    
397
        AV_DEBUG(" Vorbis time domain transform %d: %d \n", vorbis_time_count, vorbis_tdtransform);
398

    
399
        if (vorbis_tdtransform) {
400
            av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n");
401
            return 1;
402
        }
403
    }
404
    return 0;
405
}
406

    
407
// Process floors part - only floor type 1 is supported
408

    
409
static int vorbis_parse_setup_hdr_floors(vorbis_context *vc) {
410
    GetBitContext *gb=&vc->gb;
411
    uint_fast16_t i,j,k;
412

    
413
    vc->floor_count=get_bits(gb, 6)+1;
414

    
415
    vc->floors=(vorbis_floor *)av_mallocz(vc->floor_count * sizeof(vorbis_floor));
416

    
417
    for (i=0;i<vc->floor_count;++i) {
418
        vorbis_floor *floor_setup=&vc->floors[i];
419

    
420
        floor_setup->floor_type=get_bits(gb, 16);
421

    
422
        AV_DEBUG(" %d. floor type %d \n", i, floor_setup->floor_type);
423

    
424
        if (floor_setup->floor_type==1) {
425
            uint_fast8_t maximum_class=0;
426
            uint_fast8_t rangebits;
427
            uint_fast16_t floor1_values=2;
428

    
429
            floor_setup->partitions=get_bits(gb, 5);
430

    
431
            AV_DEBUG(" %d.floor: %d partitions \n", i, floor_setup->partitions);
432

    
433
            for(j=0;j<floor_setup->partitions;++j) {
434
                floor_setup->partition_class[j]=get_bits(gb, 4);
435
                if (floor_setup->partition_class[j]>maximum_class) maximum_class=floor_setup->partition_class[j];
436

    
437
                AV_DEBUG(" %d. floor %d partition class %d \n", i, j, floor_setup->partition_class[j]);
438

    
439
            }
440

    
441
            AV_DEBUG(" maximum class %d \n", maximum_class);
442

    
443
            floor_setup->maximum_class=maximum_class;
444

    
445
            for(j=0;j<=maximum_class;++j) {
446
                floor_setup->class_dimensions[j]=get_bits(gb, 3)+1;
447
                floor_setup->class_subclasses[j]=get_bits(gb, 2);
448

    
449
                AV_DEBUG(" %d floor %d class dim: %d subclasses %d \n", i, j, floor_setup->class_dimensions[j], floor_setup->class_subclasses[j]);
450

    
451
                if (floor_setup->class_subclasses[j]) {
452
                    floor_setup->class_masterbook[j]=get_bits(gb, 8);
453

    
454
                    AV_DEBUG("   masterbook: %d \n", floor_setup->class_masterbook[j]);
455
                }
456

    
457
                for(k=0;k<(1<<floor_setup->class_subclasses[j]);++k) {
458
                    floor_setup->subclass_books[j][k]=get_bits(gb, 8)-1;
459

    
460
                    AV_DEBUG("    book %d. : %d \n", k, floor_setup->subclass_books[j][k]);
461
                }
462
            }
463

    
464
            floor_setup->multiplier=get_bits(gb, 2)+1;
465
            floor_setup->x_list_dim=2;
466

    
467
            for(j=0;j<floor_setup->partitions;++j) {
468
                floor_setup->x_list_dim+=floor_setup->class_dimensions[floor_setup->partition_class[j]];
469
            }
470

    
471
            floor_setup->x_list=(uint_fast16_t *)av_mallocz(floor_setup->x_list_dim * sizeof(uint_fast16_t));
472
            floor_setup->x_list_order=(uint_fast16_t *)av_mallocz(floor_setup->x_list_dim * sizeof(uint_fast16_t));
473
            floor_setup->low_neighbour=(uint_fast16_t *)av_mallocz(floor_setup->x_list_dim * sizeof(uint_fast16_t));
474
            floor_setup->high_neighbour=(uint_fast16_t *)av_mallocz(floor_setup->x_list_dim * sizeof(uint_fast16_t));
475

    
476

    
477
            rangebits=get_bits(gb, 4);
478
            floor_setup->x_list[0] = 0;
479
            floor_setup->x_list[1] = (1<<rangebits);
480

    
481
            for(j=0;j<floor_setup->partitions;++j) {
482
                for(k=0;k<floor_setup->class_dimensions[floor_setup->partition_class[j]];++k,++floor1_values) {
483
                    floor_setup->x_list[floor1_values]=get_bits(gb, rangebits);
484

    
485
                    AV_DEBUG(" %d. floor1 Y coord. %d \n", floor1_values, floor_setup->x_list[floor1_values]);
486
                }
487
            }
488

    
489
// Precalculate order of x coordinates - needed for decode
490

    
491
            for(k=0;k<floor_setup->x_list_dim;++k) {
492
                floor_setup->x_list_order[k]=k;
493
            }
494

    
495
            for(k=0;k<floor_setup->x_list_dim-1;++k) {   // FIXME optimize sorting ?
496
                for(j=k+1;j<floor_setup->x_list_dim;++j) {
497
                    if(floor_setup->x_list[floor_setup->x_list_order[k]]>floor_setup->x_list[floor_setup->x_list_order[j]]) {
498
                        uint_fast16_t tmp=floor_setup->x_list_order[k];
499
                        floor_setup->x_list_order[k]=floor_setup->x_list_order[j];
500
                        floor_setup->x_list_order[j]=tmp;
501
                    }
502
                }
503
            }
504

    
505
// Precalculate low and high neighbours
506

    
507
            for(k=2;k<floor_setup->x_list_dim;++k) {
508
                floor_setup->low_neighbour[k]=0;
509
                floor_setup->high_neighbour[k]=1;  // correct according to SPEC requirements
510

    
511
                for (j=0;j<k;++j) {
512
                    if ((floor_setup->x_list[j]<floor_setup->x_list[k]) &&
513
                      (floor_setup->x_list[j]>floor_setup->x_list[floor_setup->low_neighbour[k]])) {
514
                        floor_setup->low_neighbour[k]=j;
515
                    }
516
                    if ((floor_setup->x_list[j]>floor_setup->x_list[k]) &&
517
                      (floor_setup->x_list[j]<floor_setup->x_list[floor_setup->high_neighbour[k]])) {
518
                        floor_setup->high_neighbour[k]=j;
519
                    }
520
                }
521
            }
522
        }
523
        else {
524
            av_log(vc->avccontext, AV_LOG_ERROR, "Only floor type 1 supported. \n");
525
            return 1;
526
        }
527
    }
528
    return 0;
529
}
530

    
531
// Process residues part
532

    
533
static int vorbis_parse_setup_hdr_residues(vorbis_context *vc){
534
    GetBitContext *gb=&vc->gb;
535
    uint_fast8_t i, j, k;
536

    
537
    vc->residue_count=get_bits(gb, 6)+1;
538
    vc->residues=(vorbis_residue *)av_mallocz(vc->residue_count * sizeof(vorbis_residue));
539

    
540
    AV_DEBUG(" There are %d residues. \n", vc->residue_count);
541

    
542
    for(i=0;i<vc->residue_count;++i) {
543
        vorbis_residue *res_setup=&vc->residues[i];
544
        uint_fast8_t cascade[64];
545
        uint_fast8_t high_bits;
546
        uint_fast8_t low_bits;
547

    
548
        res_setup->type=get_bits(gb, 16);
549

    
550
        AV_DEBUG(" %d. residue type %d \n", i, res_setup->type);
551

    
552
        res_setup->begin=get_bits(gb, 24);
553
        res_setup->end=get_bits(gb, 24);
554
        res_setup->partition_size=get_bits(gb, 24)+1;
555
        res_setup->classifications=get_bits(gb, 6)+1;
556
        res_setup->classbook=get_bits(gb, 8);
557

    
558
        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,
559
          res_setup->classifications, res_setup->classbook);
560

    
561
        for(j=0;j<res_setup->classifications;++j) {
562
            high_bits=0;
563
            low_bits=get_bits(gb, 3);
564
            if (get_bits1(gb)) {
565
                high_bits=get_bits(gb, 5);
566
            }
567
            cascade[j]=(high_bits<<3)+low_bits;
568

    
569
            AV_DEBUG("     %d class casscade depth: %d \n", j, ilog(cascade[j]));
570
        }
571

    
572
        res_setup->maxpass=0;
573
        for(j=0;j<res_setup->classifications;++j) {
574
            for(k=0;k<8;++k) {
575
                if (cascade[j]&(1<<k)) {
576
                        res_setup->books[j][k]=get_bits(gb, 8);
577

    
578
                    AV_DEBUG("     %d class casscade depth %d book: %d \n", j, k, res_setup->books[j][k]);
579

    
580
                    if (k>res_setup->maxpass) {
581
                        res_setup->maxpass=k;
582
                    }
583
                } else {
584
                    res_setup->books[j][k]=-1;
585
                }
586
            }
587
        }
588
    }
589
    return 0;
590
}
591

    
592
// Process mappings part
593

    
594
static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc) {
595
    GetBitContext *gb=&vc->gb;
596
    uint_fast8_t i, j;
597

    
598
    vc->mapping_count=get_bits(gb, 6)+1;
599
    vc->mappings=(vorbis_mapping *)av_mallocz(vc->mapping_count * sizeof(vorbis_mapping));
600

    
601
    AV_DEBUG(" There are %d mappings. \n", vc->mapping_count);
602

    
603
    for(i=0;i<vc->mapping_count;++i) {
604
        vorbis_mapping *mapping_setup=&vc->mappings[i];
605

    
606
        if (get_bits(gb, 16)) {
607
            av_log(vc->avccontext, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n");
608
            return 1;
609
        }
610
        if (get_bits1(gb)) {
611
            mapping_setup->submaps=get_bits(gb, 4)+1;
612
        } else {
613
            mapping_setup->submaps=1;
614
        }
615

    
616
        if (get_bits1(gb)) {
617
            mapping_setup->coupling_steps=get_bits(gb, 8)+1;
618
            mapping_setup->magnitude=(uint_fast8_t *)av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
619
            mapping_setup->angle=(uint_fast8_t *)av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
620
            for(j=0;j<mapping_setup->coupling_steps;++j) {
621
                mapping_setup->magnitude[j]=get_bits(gb, ilog(vc->audio_channels-1));
622
                mapping_setup->angle[j]=get_bits(gb, ilog(vc->audio_channels-1));
623
                // FIXME: sanity checks
624
            }
625
        } else {
626
            mapping_setup->coupling_steps=0;
627
        }
628

    
629
        AV_DEBUG("   %d mapping coupling steps: %d \n", i, mapping_setup->coupling_steps);
630

    
631
        if(get_bits(gb, 2)) {
632
            av_log(vc->avccontext, AV_LOG_ERROR, "%d. mapping setup data invalid. \n", i);
633
            return 1; // following spec.
634
        }
635

    
636
        if (mapping_setup->submaps>1) {
637
            mapping_setup->mux=(uint_fast8_t *)av_mallocz(vc->audio_channels * sizeof(uint_fast8_t));
638
            for(j=0;j<vc->audio_channels;++j) {
639
                mapping_setup->mux[j]=get_bits(gb, 4);
640
            }
641
        }
642

    
643
        for(j=0;j<mapping_setup->submaps;++j) {
644
            get_bits(gb, 8); // FIXME check?
645
            mapping_setup->submap_floor[j]=get_bits(gb, 8);
646
            mapping_setup->submap_residue[j]=get_bits(gb, 8);
647

    
648
            AV_DEBUG("   %d mapping %d submap : floor %d, residue %d \n", i, j, mapping_setup->submap_floor[j], mapping_setup->submap_residue[j]);
649
        }
650
    }
651
    return 0;
652
}
653

    
654
// Process modes part
655

    
656
static int vorbis_parse_setup_hdr_modes(vorbis_context *vc) {
657
    GetBitContext *gb=&vc->gb;
658
    uint_fast8_t i;
659

    
660
    vc->mode_count=get_bits(gb, 6)+1;
661
    vc->modes=(vorbis_mode *)av_mallocz(vc->mode_count * sizeof(vorbis_mode));
662

    
663
    AV_DEBUG(" There are %d modes.\n", vc->mode_count);
664

    
665
    for(i=0;i<vc->mode_count;++i) {
666
        vorbis_mode *mode_setup=&vc->modes[i];
667

    
668
        mode_setup->blockflag=get_bits(gb, 1);
669
        mode_setup->windowtype=get_bits(gb, 16); //FIXME check
670
        mode_setup->transformtype=get_bits(gb, 16); //FIXME check
671
        mode_setup->mapping=get_bits(gb, 8); //FIXME check
672

    
673
        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);
674
    }
675
    return 0;
676
}
677

    
678
// Process the whole setup header using the functions above
679

    
680
static int vorbis_parse_setup_hdr(vorbis_context *vc) {
681
    GetBitContext *gb=&vc->gb;
682

    
683
    if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') ||
684
    (get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') ||
685
    (get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) {
686
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n");
687
        return 1;
688
    }
689

    
690
    if (vorbis_parse_setup_hdr_codebooks(vc)) {
691
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n");
692
        return 2;
693
    }
694
    if (vorbis_parse_setup_hdr_tdtransforms(vc)) {
695
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n");
696
        return 3;
697
    }
698
    if (vorbis_parse_setup_hdr_floors(vc)) {
699
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n");
700
        return 4;
701
    }
702
    if (vorbis_parse_setup_hdr_residues(vc)) {
703
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n");
704
        return 5;
705
    }
706
    if (vorbis_parse_setup_hdr_mappings(vc)) {
707
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n");
708
        return 6;
709
    }
710
    if (vorbis_parse_setup_hdr_modes(vc)) {
711
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n");
712
        return 7;
713
    }
714
    if (!get_bits1(gb)) {
715
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n");
716
        return 8; // framing flag bit unset error
717
    }
718

    
719
    return 0;
720
}
721

    
722
// Process the identification header
723

    
724
static int vorbis_parse_id_hdr(vorbis_context *vc){
725
    GetBitContext *gb=&vc->gb;
726
    uint_fast8_t bl0, bl1;
727
    const float *vwin[8]={ vwin64, vwin128, vwin256, vwin512, vwin1024, vwin2048, vwin4096, vwin8192 };
728

    
729
    if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') ||
730
    (get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') ||
731
    (get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) {
732
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n");
733
        return 1;
734
    }
735

    
736
    vc->version=get_bits_long_le(gb, 32);    //FIXME check 0
737
    vc->audio_channels=get_bits(gb, 8);   //FIXME check >0
738
    vc->audio_samplerate=get_bits_long_le(gb, 32);   //FIXME check >0
739
    vc->bitrate_maximum=get_bits_long_le(gb, 32);
740
    vc->bitrate_nominal=get_bits_long_le(gb, 32);
741
    vc->bitrate_minimum=get_bits_long_le(gb, 32);
742
    bl0=get_bits(gb, 4);
743
    bl1=get_bits(gb, 4);
744
    vc->blocksize_0=(1<<bl0);
745
    vc->blocksize_1=(1<<bl1);
746
    if (bl0>13 || bl0<6 || bl1>13 || bl1<6) {
747
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n");
748
        return 3;
749
    }
750
    vc->swin=vwin[bl0-6];
751
    vc->lwin=vwin[bl1-6];
752

    
753
    if ((get_bits1(gb)) == 0) {
754
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n");
755
        return 2;
756
    }
757

    
758
    vc->channel_residues=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
759
    vc->channel_floors=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
760
    vc->saved=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
761
    vc->ret=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
762
    vc->buf=(float *)av_malloc(vc->blocksize_1 * sizeof(float));
763
    vc->buf_tmp=(float *)av_malloc(vc->blocksize_1 * sizeof(float));
764
    vc->saved_start=0;
765

    
766
    ff_mdct_init(&vc->mdct0, bl0, 1);
767
    ff_mdct_init(&vc->mdct1, bl1, 1);
768

    
769
    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 ",
770
            vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize_0, vc->blocksize_1);
771

    
772
/*
773
    BLK=vc->blocksize_0;
774
    for(i=0;i<BLK/2;++i) {
775
        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)));
776
    }
777
*/
778

    
779
    return 0;
780
}
781

    
782
// Process the extradata using the functions above (identification header, setup header)
783

    
784
static int vorbis_decode_init(AVCodecContext *avccontext) {
785
    vorbis_context *vc = avccontext->priv_data ;
786
    uint8_t *headers = avccontext->extradata;
787
    int headers_len=avccontext->extradata_size;
788
    uint8_t *header_start[3];
789
    int header_len[3];
790
    GetBitContext *gb = &(vc->gb);
791
    int i, j, hdr_type;
792

    
793
    vc->avccontext = avccontext;
794

    
795
    if (!headers_len) {
796
        av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
797
        return -1;
798
    }
799

    
800
    if(headers[0] == 0 && headers[1] == 30) {
801
        for(i = 0; i < 3; i++){
802
            header_len[i] = *headers++ << 8;
803
            header_len[i] += *headers++;
804
            header_start[i] = headers;
805
            headers += header_len[i];
806
        }
807
    } else if(headers[0] == 2) {
808
        for(j=1,i=0;i<2;++i, ++j) {
809
            header_len[i]=0;
810
            while(j<headers_len && headers[j]==0xff) {
811
                header_len[i]+=0xff;
812
                ++j;
813
            }
814
            if (j>=headers_len) {
815
                av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
816
                return -1;
817
            }
818
            header_len[i]+=headers[j];
819
        }
820
        header_len[2]=headers_len-header_len[0]-header_len[1]-j;
821
        headers+=j;
822
        header_start[0] = headers;
823
        header_start[1] = header_start[0] + header_len[0];
824
        header_start[2] = header_start[1] + header_len[1];
825
    } else {
826
        av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
827
        return -1;
828
    }
829

    
830
    init_get_bits(gb, header_start[0], header_len[0]*8);
831
    hdr_type=get_bits(gb, 8);
832
    if (hdr_type!=1) {
833
        av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n");
834
        return -1;
835
    }
836
    if (vorbis_parse_id_hdr(vc)) {
837
        av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n");
838
        vorbis_free(vc);
839
        return -1;
840
    }
841

    
842
    init_get_bits(gb, header_start[2], header_len[2]*8);
843
    hdr_type=get_bits(gb, 8);
844
    if (hdr_type!=5) {
845
        av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");
846
        return -1;
847
    }
848
    if (vorbis_parse_setup_hdr(vc)) {
849
        av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");
850
        vorbis_free(vc);
851
        return -1;
852
    }
853

    
854
    avccontext->channels = vc->audio_channels;
855
    avccontext->sample_rate = vc->audio_samplerate;
856

    
857
    return 0 ;
858
}
859

    
860
// Decode audiopackets -------------------------------------------------
861

    
862
// Read and decode floor (type 1 only)
863

    
864
static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc, vorbis_floor *vf, float *vec) {
865
    GetBitContext *gb=&vc->gb;
866
    uint_fast16_t range_v[4]={ 256, 128, 86, 64 };
867
    uint_fast16_t range=range_v[vf->multiplier-1];
868
    uint_fast16_t floor1_Y[vf->x_list_dim];
869
    uint_fast16_t floor1_Y_final[vf->x_list_dim];
870
    uint_fast8_t floor1_flag[vf->x_list_dim];
871
    uint_fast8_t class_;
872
    uint_fast8_t cdim;
873
    uint_fast8_t cbits;
874
    uint_fast8_t csub;
875
    uint_fast8_t cval;
876
    int_fast16_t book;
877
    uint_fast16_t offset;
878
    uint_fast16_t i,j;
879
    uint_fast16_t *floor_x_sort=vf->x_list_order;
880
    /*u*/int_fast16_t adx, ady, off, predicted; // WTF ? dy/adx= (unsigned)dy/adx ?
881
    int_fast16_t dy, err;
882
    uint_fast16_t lx,hx, ly, hy=0;
883

    
884

    
885
    if (!get_bits1(gb)) return 1; // silence
886

    
887
// Read values (or differences) for the floor's points
888

    
889
    floor1_Y[0]=get_bits(gb, ilog(range-1));
890
    floor1_Y[1]=get_bits(gb, ilog(range-1));
891

    
892
    AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);
893

    
894
    offset=2;
895
    for(i=0;i<vf->partitions;++i) {
896
        class_=vf->partition_class[i];
897
        cdim=vf->class_dimensions[class_];
898
        cbits=vf->class_subclasses[class_];
899
        csub=(1<<cbits)-1;
900
        cval=0;
901

    
902
        AV_DEBUG("Cbits %d \n", cbits);
903

    
904
        if (cbits) { // this reads all subclasses for this partition's class
905
            cval=get_vlc2(gb, vc->codebooks[vf->class_masterbook[class_]].vlc.table,
906
            vc->codebooks[vf->class_masterbook[class_]].nb_bits, 3);
907
        }
908

    
909
        for(j=0;j<cdim;++j) {
910
            book=vf->subclass_books[class_][cval & csub];
911

    
912
            AV_DEBUG("book %d Cbits %d cval %d  bits:%d \n", book, cbits, cval, get_bits_count(gb));
913

    
914
            cval=cval>>cbits;
915
            if (book>0) {
916
                floor1_Y[offset+j]=get_vlc2(gb, vc->codebooks[book].vlc.table,
917
                vc->codebooks[book].nb_bits, 3);
918
            } else {
919
                floor1_Y[offset+j]=0;
920
            }
921

    
922
            AV_DEBUG(" floor(%d) = %d \n", vf->x_list[offset+j], floor1_Y[offset+j]);
923
        }
924
        offset+=cdim;
925
    }
926

    
927
// Amplitude calculation from the differences
928

    
929
    floor1_flag[0]=1;
930
    floor1_flag[1]=1;
931
    floor1_Y_final[0]=floor1_Y[0];
932
    floor1_Y_final[1]=floor1_Y[1];
933

    
934
    for(i=2;i<vf->x_list_dim;++i) {
935
        uint_fast16_t val, highroom, lowroom, room;
936
        uint_fast16_t high_neigh_offs;
937
        uint_fast16_t low_neigh_offs;
938

    
939
        low_neigh_offs=vf->low_neighbour[i];
940
        high_neigh_offs=vf->high_neighbour[i];
941
        dy=floor1_Y_final[high_neigh_offs]-floor1_Y_final[low_neigh_offs];  // render_point begin
942
        adx=vf->x_list[high_neigh_offs]-vf->x_list[low_neigh_offs];
943
        ady= ABS(dy);
944
        err=ady*(vf->x_list[i]-vf->x_list[low_neigh_offs]);
945
        off=err/adx;
946
        if (dy<0) {
947
            predicted=floor1_Y_final[low_neigh_offs]-off;
948
        } else {
949
            predicted=floor1_Y_final[low_neigh_offs]+off;
950
        } // render_point end
951

    
952
        val=floor1_Y[i];
953
        highroom=range-predicted;
954
        lowroom=predicted;
955
        if (highroom < lowroom) {
956
            room=highroom*2;
957
        } else {
958
            room=lowroom*2;   // SPEC mispelling
959
        }
960
        if (val) {
961
            floor1_flag[low_neigh_offs]=1;
962
            floor1_flag[high_neigh_offs]=1;
963
            floor1_flag[i]=1;
964
            if (val>=room) {
965
                if (highroom > lowroom) {
966
                    floor1_Y_final[i]=val-lowroom+predicted;
967
                } else {
968
                    floor1_Y_final[i]=predicted-val+highroom-1;
969
                }
970
            } else {
971
                if (val & 1) {
972
                    floor1_Y_final[i]=predicted-(val+1)/2;
973
                } else {
974
                    floor1_Y_final[i]=predicted+val/2;
975
                }
976
            }
977
        } else {
978
            floor1_flag[i]=0;
979
            floor1_Y_final[i]=predicted;
980
        }
981

    
982
        AV_DEBUG(" Decoded floor(%d) = %d / val %d \n", vf->x_list[i], floor1_Y_final[i], val);
983
    }
984

    
985
// Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?
986

    
987
    hx=0;
988
    lx=0;
989
    ly=floor1_Y_final[0]*vf->multiplier;  // conforms to SPEC
990

    
991
    vec[0]=floor1_inverse_db_table[ly];
992

    
993
    for(i=1;i<vf->x_list_dim;++i) {
994
        AV_DEBUG(" Looking at post %d \n", i);
995

    
996
        if (floor1_flag[floor_x_sort[i]]) {   // SPEC mispelled
997
            int_fast16_t x, y, dy, base, sy; // if uncommented: dy = -32 adx = 2  base = 2blablabla ?????
998

    
999
            hy=floor1_Y_final[floor_x_sort[i]]*vf->multiplier;
1000
            hx=vf->x_list[floor_x_sort[i]];
1001

    
1002
            dy=hy-ly;
1003
            adx=hx-lx;
1004
            ady= (dy<0) ? -dy:dy;//ABS(dy);
1005
            base=dy/adx;
1006

    
1007
            AV_DEBUG(" dy %d  adx %d base %d = %d \n", dy, adx, base, dy/adx);
1008

    
1009
            x=lx;
1010
            y=ly;
1011
            err=0;
1012
            if (dy<0) {
1013
                sy=base-1;
1014
            } else {
1015
                sy=base+1;
1016
            }
1017
            ady=ady-(base<0 ? -base : base)*adx;
1018
            vec[x]=floor1_inverse_db_table[y];
1019

    
1020
            AV_DEBUG(" vec[ %d ] = %d \n", x, y);
1021

    
1022
            for(x=lx+1;(x<hx) && (x<vf->x_list[1]);++x) {
1023
                err+=ady;
1024
                if (err>=adx) {
1025
                    err-=adx;
1026
                    y+=sy;
1027
                } else {
1028
                    y+=base;
1029
                }
1030
                vec[x]=floor1_inverse_db_table[y];
1031

    
1032
                AV_DEBUG(" vec[ %d ] = %d \n", x, y);
1033
            }
1034

    
1035
/*            for(j=1;j<hx-lx+1;++j) {  // iterating render_point
1036
                dy=hy-ly;
1037
                adx=hx-lx;
1038
                ady= dy<0 ? -dy : dy;
1039
                err=ady*j;
1040
                off=err/adx;
1041
                if (dy<0) {
1042
                    predicted=ly-off;
1043
                } else {
1044
                    predicted=ly+off;
1045
                }
1046
                if (lx+j < vf->x_list[1]) {
1047
                    vec[lx+j]=floor1_inverse_db_table[predicted];
1048
                }
1049
            }*/
1050

    
1051
            lx=hx;
1052
            ly=hy;
1053
        }
1054
    }
1055

    
1056
    if (hx<vf->x_list[1]) {
1057
        for(i=hx;i<vf->x_list[1];++i) {
1058
            vec[i]=floor1_inverse_db_table[hy];
1059
        }
1060
    }
1061

    
1062
    AV_DEBUG(" Floor decoded\n");
1063

    
1064
    return 0;
1065
}
1066

    
1067
// Read and decode residue
1068

    
1069
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) {
1070
    GetBitContext *gb=&vc->gb;
1071
    uint_fast8_t c_p_c=vc->codebooks[vr->classbook].dimensions;
1072
    uint_fast16_t n_to_read=vr->end-vr->begin;
1073
    uint_fast16_t ptns_to_read=n_to_read/vr->partition_size;
1074
    uint_fast8_t classifs[ptns_to_read*vc->audio_channels];
1075
    uint_fast8_t pass;
1076
    uint_fast8_t ch_used;
1077
    uint_fast8_t i,j,l;
1078
    uint_fast16_t k;
1079

    
1080
    if (vr->type==2) {
1081
        for(j=1;j<ch;++j) {
1082
                do_not_decode[0]&=do_not_decode[j];  // FIXME - clobbering input
1083
        }
1084
        if (do_not_decode[0]) return 0;
1085
        ch_used=1;
1086
    } else {
1087
        ch_used=ch;
1088
    }
1089

    
1090
    AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);
1091

    
1092
    for(pass=0;pass<=vr->maxpass;++pass) { // FIXME OPTIMIZE?
1093
        uint_fast16_t voffset;
1094
        uint_fast16_t partition_count;
1095
        uint_fast16_t j_times_ptns_to_read;
1096

    
1097
        voffset=vr->begin;
1098
        for(partition_count=0;partition_count<ptns_to_read;) {  // SPEC        error
1099
            if (!pass) {
1100
                for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {
1101
                    if (!do_not_decode[j]) {
1102
                        uint_fast32_t temp=get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,
1103
                        vc->codebooks[vr->classbook].nb_bits, 3);
1104

    
1105
                        AV_DEBUG("Classword: %d \n", temp);
1106

    
1107
                        assert(vr->classifications > 1 && vr->classifications<256 && temp<=65536); //needed for inverse[]
1108
                        for(i=0;i<c_p_c;++i) {
1109
                            uint_fast32_t temp2;
1110

    
1111
                            temp2=(((uint_fast64_t)temp) * inverse[vr->classifications])>>32;
1112
                            classifs[j_times_ptns_to_read+partition_count+c_p_c-1-i]=temp-temp2*vr->classifications;
1113
                            temp=temp2;
1114
                        }
1115
                    }
1116
                    j_times_ptns_to_read+=ptns_to_read;
1117
                }
1118
            }
1119
            for(i=0;(i<c_p_c) && (partition_count<ptns_to_read);++i) {
1120
                for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {
1121
                    uint_fast16_t voffs;
1122

    
1123
                    if (!do_not_decode[j]) {
1124
                        uint_fast8_t vqclass=classifs[j_times_ptns_to_read+partition_count];
1125
                        int_fast16_t vqbook=vr->books[vqclass][pass];
1126

    
1127
                        if (vqbook>=0) {
1128
                            uint_fast16_t coffs;
1129
                            uint_fast16_t step=vr->partition_size/vc->codebooks[vqbook].dimensions;
1130
                            vorbis_codebook codebook= vc->codebooks[vqbook];
1131

    
1132
                            if (vr->type==0) {
1133

    
1134
                                voffs=voffset+j*vlen;
1135
                                for(k=0;k<step;++k) {
1136
                                    coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * codebook.dimensions;
1137
                                    for(l=0;l<codebook.dimensions;++l) {
1138
                                        vec[voffs+k+l*step]+=codebook.codevectors[coffs+l];  // FPMATH
1139
                                    }
1140
                                }
1141
                            }
1142
                            else if (vr->type==1) {
1143
                                voffs=voffset+j*vlen;
1144
                                for(k=0;k<step;++k) {
1145
                                    coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * codebook.dimensions;
1146
                                    for(l=0;l<codebook.dimensions;++l, ++voffs) {
1147
                                        vec[voffs]+=codebook.codevectors[coffs+l];  // FPMATH
1148

    
1149
                                        AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d  \n", pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);
1150
                                    }
1151
                                }
1152
                            }
1153
                            else if (vr->type==2 && ch==2 && (voffset&1)==0 && (codebook.dimensions&1)==0) { // most frequent case optimized
1154
                                voffs=voffset>>1;
1155

    
1156
                                for(k=0;k<step;++k) {
1157
                                    coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * codebook.dimensions;
1158
                                    for(l=0;l<codebook.dimensions;l+=2, voffs++) {
1159
                                        vec[voffs     ]+=codebook.codevectors[coffs+l  ];  // FPMATH
1160
                                        vec[voffs+vlen]+=codebook.codevectors[coffs+l+1];  // FPMATH
1161

    
1162
                                        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);
1163
                                    }
1164
                                }
1165

    
1166
                            }
1167
                            else if (vr->type==2) {
1168
                                voffs=voffset;
1169

    
1170
                                for(k=0;k<step;++k) {
1171
                                    coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * codebook.dimensions;
1172
                                    for(l=0;l<codebook.dimensions;++l, ++voffs) {
1173
                                        vec[voffs/ch+(voffs%ch)*vlen]+=codebook.codevectors[coffs+l];  // FPMATH FIXME use if and counter instead of / and %
1174

    
1175
                                        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);
1176
                                    }
1177
                                }
1178
                            } else {
1179
                                av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");
1180
                                return 1;
1181
                            }
1182
                        }
1183
                    }
1184
                    j_times_ptns_to_read+=ptns_to_read;
1185
                }
1186
                ++partition_count;
1187
                voffset+=vr->partition_size;
1188
            }
1189
        }
1190
    }
1191
    return 0;
1192
}
1193

    
1194
// Decode the audio packet using the functions above
1195
#define BIAS 385
1196

    
1197
static int vorbis_parse_audio_packet(vorbis_context *vc) {
1198
    GetBitContext *gb=&vc->gb;
1199

    
1200
    uint_fast8_t previous_window=0,next_window=0;
1201
    uint_fast8_t mode_number;
1202
    uint_fast16_t blocksize;
1203
    int_fast32_t i,j;
1204
    uint_fast8_t no_residue[vc->audio_channels];
1205
    uint_fast8_t do_not_decode[vc->audio_channels];
1206
    vorbis_mapping *mapping;
1207
    float *ch_res_ptr=vc->channel_residues;
1208
    float *ch_floor_ptr=vc->channel_floors;
1209
    uint_fast8_t res_chan[vc->audio_channels];
1210
    uint_fast8_t res_num=0;
1211
    int_fast16_t retlen=0;
1212
    uint_fast16_t saved_start=0;
1213

    
1214
    if (get_bits1(gb)) {
1215
        av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");
1216
        return -1; // packet type not audio
1217
    }
1218

    
1219
    if (vc->mode_count==1) {
1220
        mode_number=0;
1221
    } else {
1222
        mode_number=get_bits(gb, ilog(vc->mode_count-1));
1223
    }
1224
    mapping=&vc->mappings[vc->modes[mode_number].mapping];
1225

    
1226
    AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);
1227

    
1228
    if (vc->modes[mode_number].blockflag) {
1229
        previous_window=get_bits1(gb);
1230
        next_window=get_bits1(gb);
1231
    }
1232

    
1233
    blocksize=vc->modes[mode_number].blockflag ? vc->blocksize_1 : vc->blocksize_0;
1234
    memset(ch_res_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?
1235
    memset(ch_floor_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?
1236

    
1237
// Decode floor(1)
1238

    
1239
    for(i=0;i<vc->audio_channels;++i) {
1240
        vorbis_floor *floor;
1241
        if (mapping->submaps>1) {
1242
            floor=&vc->floors[mapping->submap_floor[mapping->mux[i]]];
1243
        } else {
1244
            floor=&vc->floors[mapping->submap_floor[0]];
1245
        }
1246

    
1247
        no_residue[i]=vorbis_floor1_decode(vc, floor, ch_floor_ptr);
1248
        ch_floor_ptr+=blocksize/2;
1249
    }
1250

    
1251
// Nonzero vector propagate
1252

    
1253
    for(i=mapping->coupling_steps-1;i>=0;--i) {
1254
        if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {
1255
            no_residue[mapping->magnitude[i]]=0;
1256
            no_residue[mapping->angle[i]]=0;
1257
        }
1258
    }
1259

    
1260
// Decode residue
1261

    
1262
    for(i=0;i<mapping->submaps;++i) {
1263
        vorbis_residue *residue;
1264
        uint_fast8_t ch=0;
1265

    
1266
        for(j=0;j<vc->audio_channels;++j) {
1267
            if ((mapping->submaps==1) || (i=mapping->mux[j])) {
1268
                res_chan[j]=res_num;
1269
                if (no_residue[j]) {
1270
                    do_not_decode[ch]=1;
1271
                } else {
1272
                    do_not_decode[ch]=0;
1273
                }
1274
                ++ch;
1275
                ++res_num;
1276
            }
1277
        }
1278
        residue=&vc->residues[mapping->submap_residue[i]];
1279
        vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);
1280

    
1281
        ch_res_ptr+=ch*blocksize/2;
1282
    }
1283

    
1284
// Inverse coupling
1285

    
1286
    for(i=mapping->coupling_steps-1;i>=0;--i) { //warning: i has to be signed
1287
        float *mag, *ang;
1288

    
1289
        mag=vc->channel_residues+res_chan[mapping->magnitude[i]]*blocksize/2;
1290
        ang=vc->channel_residues+res_chan[mapping->angle[i]]*blocksize/2;
1291
        for(j=0;j<blocksize/2;++j) {
1292
            float temp;
1293
            if (mag[j]>0.0) {
1294
                if (ang[j]>0.0) {
1295
                    ang[j]=mag[j]-ang[j];
1296
                } else {
1297
                    temp=ang[j];
1298
                    ang[j]=mag[j];
1299
                    mag[j]+=temp;
1300
                }
1301
            } else {
1302
                if (ang[j]>0.0) {
1303
                    ang[j]+=mag[j];
1304
                } else {
1305
                    temp=ang[j];
1306
                    ang[j]=mag[j];
1307
                    mag[j]-=temp;
1308
                }
1309
            }
1310
        }
1311
    }
1312

    
1313
// Dotproduct
1314

    
1315
    for(j=0, ch_floor_ptr=vc->channel_floors;j<vc->audio_channels;++j,ch_floor_ptr+=blocksize/2) {
1316
        ch_res_ptr=vc->channel_residues+res_chan[j]*blocksize/2;
1317

    
1318
        for(i=0;i<blocksize/2;++i) {
1319
            ch_floor_ptr[i]*=ch_res_ptr[i]; //FPMATH
1320
        }
1321
    }
1322

    
1323
// MDCT, overlap/add, save data for next overlapping  FPMATH
1324

    
1325
    for(j=0;j<vc->audio_channels;++j) {
1326
        uint_fast8_t step=vc->audio_channels;
1327
        uint_fast16_t k;
1328
        float *saved=vc->saved+j*vc->blocksize_1/2;
1329
        float *ret=vc->ret;
1330
        const float *lwin=vc->lwin;
1331
        const float *swin=vc->swin;
1332
        float *buf=vc->buf;
1333
        float *buf_tmp=vc->buf_tmp;
1334

    
1335
        ch_floor_ptr=vc->channel_floors+j*blocksize/2;
1336

    
1337
        saved_start=vc->saved_start;
1338

    
1339
        ff_imdct_calc(vc->modes[mode_number].blockflag ? &vc->mdct1 : &vc->mdct0, buf, ch_floor_ptr, buf_tmp);
1340

    
1341
        if (vc->modes[mode_number].blockflag) {
1342
            // -- overlap/add
1343
            if (previous_window) {
1344
                for(k=j, i=0;i<vc->blocksize_1/2;++i, k+=step) {
1345
                    ret[k]=saved[i]+buf[i]*lwin[i]+BIAS;
1346
                }
1347
                retlen=vc->blocksize_1/2;
1348
            } else {
1349
                buf += (vc->blocksize_1-vc->blocksize_0)/4;
1350
                for(k=j, i=0;i<vc->blocksize_0/2;++i, k+=step) {
1351
                    ret[k]=saved[i]+buf[i]*swin[i]+BIAS;
1352
                }
1353
                buf += vc->blocksize_0/2;
1354
                for(i=0;i<(vc->blocksize_1-vc->blocksize_0)/4;++i, k+=step) {
1355
                    ret[k]=buf[i]+BIAS;
1356
                }
1357
                buf=vc->buf;
1358
                retlen=vc->blocksize_0/2+(vc->blocksize_1-vc->blocksize_0)/4;
1359
            }
1360
            // -- save
1361
            if (next_window) {
1362
                buf += vc->blocksize_1/2;
1363
                lwin += vc->blocksize_1/2-1;
1364
                for(i=0;i<vc->blocksize_1/2;++i) {
1365
                    saved[i]=buf[i]*lwin[-i];
1366
                }
1367
                saved_start=0;
1368
            } else {
1369
                saved_start=(vc->blocksize_1-vc->blocksize_0)/4;
1370
                buf += vc->blocksize_1/2;
1371
                for(i=0;i<saved_start;++i) {
1372
                    saved[i]=buf[i];
1373
                }
1374
                swin += vc->blocksize_0/2-1;
1375
                for(i=0;i<vc->blocksize_0/2;++i) {
1376
                    saved[saved_start+i]=buf[saved_start+i]*swin[-i];
1377
                }
1378
            }
1379
        } else {
1380
            // --overlap/add
1381
            for(k=j, i=0;i<saved_start;++i, k+=step) {
1382
                ret[k]=saved[i]+BIAS;
1383
            }
1384
            for(i=0;i<vc->blocksize_0/2;++i, k+=step) {
1385
                ret[k]=saved[saved_start+i]+buf[i]*swin[i]+BIAS;
1386
            }
1387
            retlen=saved_start+vc->blocksize_0/2;
1388
            // -- save
1389
            buf += vc->blocksize_0/2;
1390
            swin += vc->blocksize_0/2-1;
1391
            for(i=0;i<vc->blocksize_0/2;++i) {
1392
                saved[i]=buf[i]*swin[-i];
1393
            }
1394
            saved_start=0;
1395
        }
1396
    }
1397
    vc->saved_start=saved_start;
1398

    
1399
    return retlen*vc->audio_channels;
1400
}
1401

    
1402
// Return the decoded audio packet through the standard api
1403

    
1404
static int vorbis_decode_frame(AVCodecContext *avccontext,
1405
                        void *data, int *data_size,
1406
                        uint8_t *buf, int buf_size)
1407
{
1408
    vorbis_context *vc = avccontext->priv_data ;
1409
    GetBitContext *gb = &(vc->gb);
1410

    
1411
    int_fast16_t i, len;
1412

    
1413
    if(!buf_size){
1414
        return 0;
1415
    }
1416

    
1417
    AV_DEBUG("packet length %d \n", buf_size);
1418

    
1419
    init_get_bits(gb, buf, buf_size*8);
1420

    
1421
    len=vorbis_parse_audio_packet(vc);
1422

    
1423
    if (len<=0) {
1424
        *data_size=0;
1425
        return buf_size;
1426
    }
1427

    
1428
    if (!vc->first_frame) {
1429
        vc->first_frame=1;
1430
        *data_size=0;
1431
        return buf_size ;
1432
    }
1433

    
1434
    AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);
1435

    
1436
    for(i=0;i<len;++i) {
1437
        int_fast32_t tmp= ((int32_t*)vc->ret)[i];
1438
        if(tmp & 0xf0000){
1439
//            tmp= (0x43c0ffff - tmp)>>31; //ask gcc devs why this is slower
1440
            if(tmp > 0x43c0ffff) tmp= 0xFFFF;
1441
            else                 tmp= 0;
1442
        }
1443
        ((int16_t*)data)[i]=tmp - 0x8000;
1444
    }
1445

    
1446
    *data_size=len*2;
1447

    
1448
    return buf_size ;
1449
}
1450

    
1451
// Close decoder
1452

    
1453
static int vorbis_decode_close(AVCodecContext *avccontext) {
1454
    vorbis_context *vc = avccontext->priv_data;
1455

    
1456
    vorbis_free(vc);
1457

    
1458
    return 0 ;
1459
}
1460

    
1461
AVCodec vorbis_decoder = {
1462
    "vorbis",
1463
    CODEC_TYPE_AUDIO,
1464
    CODEC_ID_VORBIS,
1465
    sizeof(vorbis_context),
1466
    vorbis_decode_init,
1467
    NULL,
1468
    vorbis_decode_close,
1469
    vorbis_decode_frame,
1470
};
1471