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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
 *
11
 * 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
18
 * 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
static 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
#define BARK(x) \
60
    (13.1f*atan(0.00074f*(x))+2.24f*atan(1.85e-8f*(x)*(x))+1e-4f*(x))
61

    
62
static unsigned int nth_root(unsigned int x, unsigned int n) {   // x^(1/n)
63
    unsigned int ret=0, i, j;
64

    
65
    do {
66
        ++ret;
67
        for(i=0,j=ret;i<n-1;i++) j*=ret;
68
    } while (j<=x);
69

    
70
    return (ret-1);
71
}
72

    
73
static float vorbisfloat2float(uint_fast32_t val) {
74
    double mant=val&0x1fffff;
75
    long exp=(val&0x7fe00000L)>>21;
76
    if (val&0x80000000) mant=-mant;
77
    return(ldexp(mant, exp-20-768));
78
}
79

    
80

    
81
// Generate vlc codes from vorbis huffman code lengths
82

    
83
static int vorbis_len2vlc(vorbis_context *vc, uint_fast8_t *bits, uint_fast32_t *codes, uint_fast32_t num) {
84
    uint_fast32_t exit_at_level[33]={404,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
85
        0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
86

    
87
    uint_fast8_t i,j;
88
    uint_fast32_t code,p;
89

    
90
#ifdef V_DEBUG
91
    GetBitContext gb;
92
#endif
93

    
94
    for(p=0;(bits[p]==0) && (p<num);++p);
95
    if (p==num) {
96
//        av_log(vc->avccontext, AV_LOG_INFO, "An empty codebook. Heh?! \n");
97
        return 0;
98
    }
99

    
100
    codes[p]=0;
101
    for(i=0;i<bits[p];++i) {
102
        exit_at_level[i+1]=1<<i;
103
    }
104

    
105
#ifdef V_DEBUG
106
    av_log(vc->avccontext, AV_LOG_INFO, " %d. of %d code len %d code %d - ", p, num, bits[p], codes[p]);
107
    init_get_bits(&gb, (uint_fast8_t *)&codes[p], bits[p]);
108
    for(i=0;i<bits[p];++i) {
109
        av_log(vc->avccontext, AV_LOG_INFO, "%s", get_bits1(&gb) ? "1" : "0");
110
    }
111
    av_log(vc->avccontext, AV_LOG_INFO, "\n");
112
#endif
113

    
114
    ++p;
115

    
116
    for(;p<num;++p) {
117
        if (bits[p]==0) continue;
118
        // find corresponding exit(node which the tree can grow further from)
119
        for(i=bits[p];i>0;--i) {
120
            if (exit_at_level[i]) break;
121
        }
122
        if (!i) return 1; // overspecified tree
123
        code=exit_at_level[i];
124
        exit_at_level[i]=0;
125
        // construct code (append 0s to end) and introduce new exits
126
        for(j=i+1;j<=bits[p];++j) {
127
            exit_at_level[j]=code+(1<<(j-1));
128
        }
129
        codes[p]=code;
130

    
131
#ifdef V_DEBUG
132
        av_log(vc->avccontext, AV_LOG_INFO, " %d. code len %d code %d - ", p, bits[p], codes[p]);
133
        init_get_bits(&gb, (uint_fast8_t *)&codes[p], bits[p]);
134
        for(i=0;i<bits[p];++i) {
135
            av_log(vc->avccontext, AV_LOG_INFO, "%s", get_bits1(&gb) ? "1" : "0");
136
        }
137
        av_log(vc->avccontext, AV_LOG_INFO, "\n");
138
#endif
139

    
140
    }
141

    
142
    //FIXME no exits should be left (underspecified tree - ie. unused valid vlcs - not allowed by SPEC)
143

    
144
    return 0;
145
}
146

    
147
// Free all allocated memory -----------------------------------------
148

    
149
static void vorbis_free(vorbis_context *vc) {
150
    int_fast16_t i;
151

    
152
    av_freep(&vc->channel_residues);
153
    av_freep(&vc->channel_floors);
154
    av_freep(&vc->saved);
155
    av_freep(&vc->ret);
156
    av_freep(&vc->buf);
157
    av_freep(&vc->buf_tmp);
158

    
159
    av_freep(&vc->residues);
160
    av_freep(&vc->modes);
161

    
162
    ff_mdct_end(&vc->mdct0);
163
    ff_mdct_end(&vc->mdct1);
164

    
165
    for(i=0;i<vc->codebook_count;++i) {
166
        av_free(vc->codebooks[i].codevectors);
167
        free_vlc(&vc->codebooks[i].vlc);
168
    }
169
    av_freep(&vc->codebooks);
170

    
171
    for(i=0;i<vc->floor_count;++i) {
172
        if(vc->floors[i].floor_type==0) {
173
            av_free(vc->floors[i].data.t0.map[0]);
174
            av_free(vc->floors[i].data.t0.map[1]);
175
            av_free(vc->floors[i].data.t0.book_list);
176
            av_free(vc->floors[i].data.t0.lsp);
177
        }
178
        else {
179
            av_free(vc->floors[i].data.t1.x_list);
180
            av_free(vc->floors[i].data.t1.x_list_order);
181
            av_free(vc->floors[i].data.t1.low_neighbour);
182
            av_free(vc->floors[i].data.t1.high_neighbour);
183
        }
184
    }
185
    av_freep(&vc->floors);
186

    
187
    for(i=0;i<vc->mapping_count;++i) {
188
        av_free(vc->mappings[i].magnitude);
189
        av_free(vc->mappings[i].angle);
190
        av_free(vc->mappings[i].mux);
191
    }
192
    av_freep(&vc->mappings);
193
}
194

    
195
// Parse setup header -------------------------------------------------
196

    
197
// Process codebooks part
198

    
199
static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc) {
200
    uint_fast16_t cb;
201
    uint_fast8_t *tmp_vlc_bits;
202
    uint_fast32_t *tmp_vlc_codes;
203
    GetBitContext *gb=&vc->gb;
204

    
205
    vc->codebook_count=get_bits(gb,8)+1;
206

    
207
    AV_DEBUG(" Codebooks: %d \n", vc->codebook_count);
208

    
209
    vc->codebooks=(vorbis_codebook *)av_mallocz(vc->codebook_count * sizeof(vorbis_codebook));
210
    tmp_vlc_bits=(uint_fast8_t *)av_mallocz(V_MAX_VLCS * sizeof(uint_fast8_t));
211
    tmp_vlc_codes=(uint_fast32_t *)av_mallocz(V_MAX_VLCS * sizeof(uint_fast32_t));
212

    
213
    for(cb=0;cb<vc->codebook_count;++cb) {
214
        vorbis_codebook *codebook_setup=&vc->codebooks[cb];
215
        uint_fast8_t ordered;
216
        uint_fast32_t t, used_entries=0;
217
        uint_fast32_t entries;
218

    
219
        AV_DEBUG(" %d. Codebook \n", cb);
220

    
221
        if (get_bits(gb, 24)!=0x564342) {
222
            av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook setup data corrupt. \n", cb);
223
            goto error;
224
        }
225

    
226
        codebook_setup->dimensions=get_bits(gb, 16);
227
        if (codebook_setup->dimensions>16) {
228
            av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook's dimension is too large (%d). \n", cb, codebook_setup->dimensions);
229
            goto error;
230
        }
231
        entries=get_bits(gb, 24);
232
        if (entries>V_MAX_VLCS) {
233
            av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook has too many entries (%"PRIdFAST32"). \n", cb, entries);
234
            goto error;
235
        }
236

    
237
        ordered=get_bits1(gb);
238

    
239
        AV_DEBUG(" codebook_dimensions %d, codebook_entries %d \n", codebook_setup->dimensions, entries);
240

    
241
        if (!ordered) {
242
            uint_fast16_t ce;
243
            uint_fast8_t flag;
244
            uint_fast8_t sparse=get_bits1(gb);
245

    
246
            AV_DEBUG(" not ordered \n");
247

    
248
            if (sparse) {
249
                AV_DEBUG(" sparse \n");
250

    
251
                used_entries=0;
252
                for(ce=0;ce<entries;++ce) {
253
                    flag=get_bits1(gb);
254
                    if (flag) {
255
                        tmp_vlc_bits[ce]=get_bits(gb, 5)+1;
256
                        ++used_entries;
257
                    }
258
                    else tmp_vlc_bits[ce]=0;
259
                }
260
            } else {
261
                AV_DEBUG(" not sparse \n");
262

    
263
                used_entries=entries;
264
                for(ce=0;ce<entries;++ce) {
265
                    tmp_vlc_bits[ce]=get_bits(gb, 5)+1;
266
                }
267
            }
268
        } else {
269
            uint_fast16_t current_entry=0;
270
            uint_fast8_t current_length=get_bits(gb, 5)+1;
271

    
272
            AV_DEBUG(" ordered, current length: %d \n", current_length);  //FIXME
273

    
274
            used_entries=entries;
275
            for(;current_entry<used_entries;++current_length) {
276
                uint_fast16_t i, number;
277

    
278
                AV_DEBUG(" number bits: %d ", ilog(entries - current_entry));
279

    
280
                number=get_bits(gb, ilog(entries - current_entry));
281

    
282
                AV_DEBUG(" number: %d \n", number);
283

    
284
                for(i=current_entry;i<number+current_entry;++i) {
285
                    if (i<used_entries) tmp_vlc_bits[i]=current_length;
286
                }
287

    
288
                current_entry+=number;
289
            }
290
            if (current_entry>used_entries) {
291
                av_log(vc->avccontext, AV_LOG_ERROR, " More codelengths than codes in codebook. \n");
292
                goto error;
293
            }
294
        }
295

    
296
        codebook_setup->lookup_type=get_bits(gb, 4);
297

    
298
        AV_DEBUG(" lookup type: %d : %s \n", codebook_setup->lookup_type, codebook_setup->lookup_type ? "vq" : "no lookup" );
299

    
300
// If the codebook is used for (inverse) VQ, calculate codevectors.
301

    
302
        if (codebook_setup->lookup_type==1) {
303
            uint_fast16_t i, j, k;
304
            uint_fast16_t codebook_lookup_values=nth_root(entries, codebook_setup->dimensions);
305
            uint_fast16_t codebook_multiplicands[codebook_lookup_values];
306

    
307
            float codebook_minimum_value=vorbisfloat2float(get_bits_long_le(gb, 32));
308
            float codebook_delta_value=vorbisfloat2float(get_bits_long_le(gb, 32));
309
            uint_fast8_t codebook_value_bits=get_bits(gb, 4)+1;
310
            uint_fast8_t codebook_sequence_p=get_bits1(gb);
311

    
312
            AV_DEBUG(" We expect %d numbers for building the codevectors. \n", codebook_lookup_values);
313
            AV_DEBUG("  delta %f minmum %f \n", codebook_delta_value, codebook_minimum_value);
314

    
315
            for(i=0;i<codebook_lookup_values;++i) {
316
                codebook_multiplicands[i]=get_bits(gb, codebook_value_bits);
317

    
318
                AV_DEBUG(" multiplicands*delta+minmum : %e \n", (float)codebook_multiplicands[i]*codebook_delta_value+codebook_minimum_value);
319
                AV_DEBUG(" multiplicand %d \n", codebook_multiplicands[i]);
320
            }
321

    
322
// Weed out unused vlcs and build codevector vector
323
            codebook_setup->codevectors=(float *)av_mallocz(used_entries*codebook_setup->dimensions * sizeof(float));
324
            for(j=0, i=0;i<entries;++i) {
325
                uint_fast8_t dim=codebook_setup->dimensions;
326

    
327
                if (tmp_vlc_bits[i]) {
328
                    float last=0.0;
329
                    uint_fast32_t lookup_offset=i;
330

    
331
#ifdef V_DEBUG
332
                    av_log(vc->avccontext, AV_LOG_INFO, "Lookup offset %d ,", i);
333
#endif
334

    
335
                    for(k=0;k<dim;++k) {
336
                        uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values;
337
                        codebook_setup->codevectors[j*dim+k]=codebook_multiplicands[multiplicand_offset]*codebook_delta_value+codebook_minimum_value+last;
338
                        if (codebook_sequence_p) {
339
                            last=codebook_setup->codevectors[j*dim+k];
340
                        }
341
                        lookup_offset/=codebook_lookup_values;
342
                    }
343
                    tmp_vlc_bits[j]=tmp_vlc_bits[i];
344

    
345
#ifdef V_DEBUG
346
                    av_log(vc->avccontext, AV_LOG_INFO, "real lookup offset %d, vector: ", j);
347
                    for(k=0;k<dim;++k) {
348
                        av_log(vc->avccontext, AV_LOG_INFO, " %f ", codebook_setup->codevectors[j*dim+k]);
349
                    }
350
                    av_log(vc->avccontext, AV_LOG_INFO, "\n");
351
#endif
352

    
353
                    ++j;
354
                }
355
            }
356
            if (j!=used_entries) {
357
                av_log(vc->avccontext, AV_LOG_ERROR, "Bug in codevector vector building code. \n");
358
                goto error;
359
            }
360
            entries=used_entries;
361
        }
362
        else if (codebook_setup->lookup_type>=2) {
363
            av_log(vc->avccontext, AV_LOG_ERROR, "Codebook lookup type not supported. \n");
364
            goto error;
365
        }
366

    
367
// Initialize VLC table
368
        if (vorbis_len2vlc(vc, tmp_vlc_bits, tmp_vlc_codes, entries)) {
369
            av_log(vc->avccontext, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");
370
            goto error;
371
        }
372
        codebook_setup->maxdepth=0;
373
        for(t=0;t<entries;++t)
374
            if (tmp_vlc_bits[t]>=codebook_setup->maxdepth) codebook_setup->maxdepth=tmp_vlc_bits[t];
375

    
376
        if(codebook_setup->maxdepth > 3*V_NB_BITS) codebook_setup->nb_bits=V_NB_BITS2;
377
        else                                       codebook_setup->nb_bits=V_NB_BITS;
378

    
379
        codebook_setup->maxdepth=(codebook_setup->maxdepth+codebook_setup->nb_bits-1)/codebook_setup->nb_bits;
380

    
381
        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)) {
382
            av_log(vc->avccontext, AV_LOG_ERROR, " Error generating vlc tables. \n");
383
            goto error;
384
        }
385
    }
386

    
387
    av_free(tmp_vlc_bits);
388
    av_free(tmp_vlc_codes);
389
    return 0;
390

    
391
// Error:
392
error:
393
    av_free(tmp_vlc_bits);
394
    av_free(tmp_vlc_codes);
395
    return 1;
396
}
397

    
398
// Process time domain transforms part (unused in Vorbis I)
399

    
400
static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc) {
401
    GetBitContext *gb=&vc->gb;
402
    uint_fast8_t i;
403
    uint_fast8_t vorbis_time_count=get_bits(gb, 6)+1;
404

    
405
    for(i=0;i<vorbis_time_count;++i) {
406
        uint_fast16_t vorbis_tdtransform=get_bits(gb, 16);
407

    
408
        AV_DEBUG(" Vorbis time domain transform %d: %d \n", vorbis_time_count, vorbis_tdtransform);
409

    
410
        if (vorbis_tdtransform) {
411
            av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n");
412
            return 1;
413
        }
414
    }
415
    return 0;
416
}
417

    
418
// Process floors part
419

    
420
static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,
421
                                         vorbis_floor_data *vfu, float *vec);
422
static void create_map( vorbis_context * vc, uint_fast8_t floor_number );
423
static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc,
424
                                         vorbis_floor_data *vfu, float *vec);
425
static int vorbis_parse_setup_hdr_floors(vorbis_context *vc) {
426
    GetBitContext *gb=&vc->gb;
427
    uint_fast16_t i,j,k;
428

    
429
    vc->floor_count=get_bits(gb, 6)+1;
430

    
431
    vc->floors=(vorbis_floor *)av_mallocz(vc->floor_count * sizeof(vorbis_floor));
432

    
433
    for (i=0;i<vc->floor_count;++i) {
434
        vorbis_floor *floor_setup=&vc->floors[i];
435

    
436
        floor_setup->floor_type=get_bits(gb, 16);
437

    
438
        AV_DEBUG(" %d. floor type %d \n", i, floor_setup->floor_type);
439

    
440
        if (floor_setup->floor_type==1) {
441
            uint_fast8_t maximum_class=0;
442
            uint_fast8_t rangebits;
443
            uint_fast16_t floor1_values=2;
444

    
445
            floor_setup->decode=vorbis_floor1_decode;
446

    
447
            floor_setup->data.t1.partitions=get_bits(gb, 5);
448

    
449
            AV_DEBUG(" %d.floor: %d partitions \n", i, floor_setup->data.t1.partitions);
450

    
451
            for(j=0;j<floor_setup->data.t1.partitions;++j) {
452
                floor_setup->data.t1.partition_class[j]=get_bits(gb, 4);
453
                if (floor_setup->data.t1.partition_class[j]>maximum_class) maximum_class=floor_setup->data.t1.partition_class[j];
454

    
455
                AV_DEBUG(" %d. floor %d partition class %d \n", i, j, floor_setup->data.t1.partition_class[j]);
456

    
457
            }
458

    
459
            AV_DEBUG(" maximum class %d \n", maximum_class);
460

    
461
            floor_setup->data.t1.maximum_class=maximum_class;
462

    
463
            for(j=0;j<=maximum_class;++j) {
464
                floor_setup->data.t1.class_dimensions[j]=get_bits(gb, 3)+1;
465
                floor_setup->data.t1.class_subclasses[j]=get_bits(gb, 2);
466

    
467
                AV_DEBUG(" %d floor %d class dim: %d subclasses %d \n", i, j, floor_setup->data.t1.class_dimensions[j], floor_setup->data.t1.class_subclasses[j]);
468

    
469
                if (floor_setup->data.t1.class_subclasses[j]) {
470
                    floor_setup->data.t1.class_masterbook[j]=get_bits(gb, 8);
471

    
472
                    AV_DEBUG("   masterbook: %d \n", floor_setup->data.t1.class_masterbook[j]);
473
                }
474

    
475
                for(k=0;k<(1<<floor_setup->data.t1.class_subclasses[j]);++k) {
476
                    floor_setup->data.t1.subclass_books[j][k]=get_bits(gb, 8)-1;
477

    
478
                    AV_DEBUG("    book %d. : %d \n", k, floor_setup->data.t1.subclass_books[j][k]);
479
                }
480
            }
481

    
482
            floor_setup->data.t1.multiplier=get_bits(gb, 2)+1;
483
            floor_setup->data.t1.x_list_dim=2;
484

    
485
            for(j=0;j<floor_setup->data.t1.partitions;++j) {
486
                floor_setup->data.t1.x_list_dim+=floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];
487
            }
488

    
489
            floor_setup->data.t1.x_list=(uint_fast16_t *)av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(uint_fast16_t));
490
            floor_setup->data.t1.x_list_order=(uint_fast16_t *)av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(uint_fast16_t));
491
            floor_setup->data.t1.low_neighbour=(uint_fast16_t *)av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(uint_fast16_t));
492
            floor_setup->data.t1.high_neighbour=(uint_fast16_t *)av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(uint_fast16_t));
493

    
494

    
495
            rangebits=get_bits(gb, 4);
496
            floor_setup->data.t1.x_list[0] = 0;
497
            floor_setup->data.t1.x_list[1] = (1<<rangebits);
498

    
499
            for(j=0;j<floor_setup->data.t1.partitions;++j) {
500
                for(k=0;k<floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];++k,++floor1_values) {
501
                    floor_setup->data.t1.x_list[floor1_values]=get_bits(gb, rangebits);
502

    
503
                    AV_DEBUG(" %d. floor1 Y coord. %d \n", floor1_values, floor_setup->data.t1.x_list[floor1_values]);
504
                }
505
            }
506

    
507
// Precalculate order of x coordinates - needed for decode
508

    
509
            for(k=0;k<floor_setup->data.t1.x_list_dim;++k) {
510
                floor_setup->data.t1.x_list_order[k]=k;
511
            }
512

    
513
            for(k=0;k<floor_setup->data.t1.x_list_dim-1;++k) {   // FIXME optimize sorting ?
514
                for(j=k+1;j<floor_setup->data.t1.x_list_dim;++j) {
515
                    if(floor_setup->data.t1.x_list[floor_setup->data.t1.x_list_order[k]]>floor_setup->data.t1.x_list[floor_setup->data.t1.x_list_order[j]]) {
516
                        uint_fast16_t tmp=floor_setup->data.t1.x_list_order[k];
517
                        floor_setup->data.t1.x_list_order[k]=floor_setup->data.t1.x_list_order[j];
518
                        floor_setup->data.t1.x_list_order[j]=tmp;
519
                    }
520
                }
521
            }
522

    
523
// Precalculate low and high neighbours
524

    
525
            for(k=2;k<floor_setup->data.t1.x_list_dim;++k) {
526
                floor_setup->data.t1.low_neighbour[k]=0;
527
                floor_setup->data.t1.high_neighbour[k]=1;  // correct according to SPEC requirements
528

    
529
                for (j=0;j<k;++j) {
530
                    if ((floor_setup->data.t1.x_list[j]<floor_setup->data.t1.x_list[k]) &&
531
                      (floor_setup->data.t1.x_list[j]>floor_setup->data.t1.x_list[floor_setup->data.t1.low_neighbour[k]])) {
532
                        floor_setup->data.t1.low_neighbour[k]=j;
533
                    }
534
                    if ((floor_setup->data.t1.x_list[j]>floor_setup->data.t1.x_list[k]) &&
535
                      (floor_setup->data.t1.x_list[j]<floor_setup->data.t1.x_list[floor_setup->data.t1.high_neighbour[k]])) {
536
                        floor_setup->data.t1.high_neighbour[k]=j;
537
                    }
538
                }
539
            }
540
        }
541
        else if(floor_setup->floor_type==0) {
542
            uint_fast8_t max_codebook_dim=0;
543

    
544
            floor_setup->decode=vorbis_floor0_decode;
545

    
546
            floor_setup->data.t0.order=get_bits(gb, 8);
547
            floor_setup->data.t0.rate=get_bits(gb, 16);
548
            floor_setup->data.t0.bark_map_size=get_bits(gb, 16);
549
            floor_setup->data.t0.amplitude_bits=get_bits(gb, 6);
550
            /* zero would result in a div by zero later *
551
             * 2^0 - 1 == 0                             */
552
            if (floor_setup->data.t0.amplitude_bits == 0) {
553
              av_log(vc->avccontext, AV_LOG_ERROR,
554
                     "Floor 0 amplitude bits is 0.\n");
555
              return 1;
556
            }
557
            floor_setup->data.t0.amplitude_offset=get_bits(gb, 8);
558
            floor_setup->data.t0.num_books=get_bits(gb, 4)+1;
559

    
560
            /* allocate mem for booklist */
561
            floor_setup->data.t0.book_list=
562
                av_malloc(floor_setup->data.t0.num_books);
563
            if(!floor_setup->data.t0.book_list) { return 1; }
564
            /* read book indexes */
565
            {
566
                int idx;
567
                uint_fast8_t book_idx;
568
                for (idx=0;idx<floor_setup->data.t0.num_books;++idx) {
569
                    book_idx=get_bits(gb, 8);
570
                    floor_setup->data.t0.book_list[idx]=book_idx;
571
                    if (vc->codebooks[book_idx].dimensions > max_codebook_dim)
572
                        max_codebook_dim=vc->codebooks[book_idx].dimensions;
573

    
574
                    if (floor_setup->data.t0.book_list[idx]>vc->codebook_count)
575
                        return 1;
576
                }
577
            }
578

    
579
            create_map( vc, i );
580

    
581
            /* allocate mem for lsp coefficients */
582
            {
583
                /* codebook dim is for padding if codebook dim doesn't *
584
                 * divide order+1 then we need to read more data       */
585
                floor_setup->data.t0.lsp=
586
                    av_malloc((floor_setup->data.t0.order+1 + max_codebook_dim)
587
                              * sizeof(float));
588
                if(!floor_setup->data.t0.lsp) { return 1; }
589
            }
590

    
591
#ifdef V_DEBUG /* debug output parsed headers */
592
            AV_DEBUG("floor0 order: %u\n", floor_setup->data.t0.order);
593
            AV_DEBUG("floor0 rate: %u\n", floor_setup->data.t0.rate);
594
            AV_DEBUG("floor0 bark map size: %u\n",
595
              floor_setup->data.t0.bark_map_size);
596
            AV_DEBUG("floor0 amplitude bits: %u\n",
597
              floor_setup->data.t0.amplitude_bits);
598
            AV_DEBUG("floor0 amplitude offset: %u\n",
599
              floor_setup->data.t0.amplitude_offset);
600
            AV_DEBUG("floor0 number of books: %u\n",
601
              floor_setup->data.t0.num_books);
602
            AV_DEBUG("floor0 book list pointer: %p\n",
603
              floor_setup->data.t0.book_list);
604
            {
605
              int idx;
606
              for (idx=0;idx<floor_setup->data.t0.num_books;++idx) {
607
                AV_DEBUG( "  Book %d: %u\n",
608
                  idx+1,
609
                  floor_setup->data.t0.book_list[idx] );
610
              }
611
            }
612
#endif
613
        }
614
        else {
615
            av_log(vc->avccontext, AV_LOG_ERROR, "Invalid floor type!\n");
616
            return 1;
617
        }
618
    }
619
    return 0;
620
}
621

    
622
// Process residues part
623

    
624
static int vorbis_parse_setup_hdr_residues(vorbis_context *vc){
625
    GetBitContext *gb=&vc->gb;
626
    uint_fast8_t i, j, k;
627

    
628
    vc->residue_count=get_bits(gb, 6)+1;
629
    vc->residues=(vorbis_residue *)av_mallocz(vc->residue_count * sizeof(vorbis_residue));
630

    
631
    AV_DEBUG(" There are %d residues. \n", vc->residue_count);
632

    
633
    for(i=0;i<vc->residue_count;++i) {
634
        vorbis_residue *res_setup=&vc->residues[i];
635
        uint_fast8_t cascade[64];
636
        uint_fast8_t high_bits;
637
        uint_fast8_t low_bits;
638

    
639
        res_setup->type=get_bits(gb, 16);
640

    
641
        AV_DEBUG(" %d. residue type %d \n", i, res_setup->type);
642

    
643
        res_setup->begin=get_bits(gb, 24);
644
        res_setup->end=get_bits(gb, 24);
645
        res_setup->partition_size=get_bits(gb, 24)+1;
646
        res_setup->classifications=get_bits(gb, 6)+1;
647
        res_setup->classbook=get_bits(gb, 8);
648

    
649
        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,
650
          res_setup->classifications, res_setup->classbook);
651

    
652
        for(j=0;j<res_setup->classifications;++j) {
653
            high_bits=0;
654
            low_bits=get_bits(gb, 3);
655
            if (get_bits1(gb)) {
656
                high_bits=get_bits(gb, 5);
657
            }
658
            cascade[j]=(high_bits<<3)+low_bits;
659

    
660
            AV_DEBUG("     %d class casscade depth: %d \n", j, ilog(cascade[j]));
661
        }
662

    
663
        res_setup->maxpass=0;
664
        for(j=0;j<res_setup->classifications;++j) {
665
            for(k=0;k<8;++k) {
666
                if (cascade[j]&(1<<k)) {
667
                        res_setup->books[j][k]=get_bits(gb, 8);
668

    
669
                    AV_DEBUG("     %d class casscade depth %d book: %d \n", j, k, res_setup->books[j][k]);
670

    
671
                    if (k>res_setup->maxpass) {
672
                        res_setup->maxpass=k;
673
                    }
674
                } else {
675
                    res_setup->books[j][k]=-1;
676
                }
677
            }
678
        }
679
    }
680
    return 0;
681
}
682

    
683
// Process mappings part
684

    
685
static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc) {
686
    GetBitContext *gb=&vc->gb;
687
    uint_fast8_t i, j;
688

    
689
    vc->mapping_count=get_bits(gb, 6)+1;
690
    vc->mappings=(vorbis_mapping *)av_mallocz(vc->mapping_count * sizeof(vorbis_mapping));
691

    
692
    AV_DEBUG(" There are %d mappings. \n", vc->mapping_count);
693

    
694
    for(i=0;i<vc->mapping_count;++i) {
695
        vorbis_mapping *mapping_setup=&vc->mappings[i];
696

    
697
        if (get_bits(gb, 16)) {
698
            av_log(vc->avccontext, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n");
699
            return 1;
700
        }
701
        if (get_bits1(gb)) {
702
            mapping_setup->submaps=get_bits(gb, 4)+1;
703
        } else {
704
            mapping_setup->submaps=1;
705
        }
706

    
707
        if (get_bits1(gb)) {
708
            mapping_setup->coupling_steps=get_bits(gb, 8)+1;
709
            mapping_setup->magnitude=(uint_fast8_t *)av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
710
            mapping_setup->angle=(uint_fast8_t *)av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
711
            for(j=0;j<mapping_setup->coupling_steps;++j) {
712
                mapping_setup->magnitude[j]=get_bits(gb, ilog(vc->audio_channels-1));
713
                mapping_setup->angle[j]=get_bits(gb, ilog(vc->audio_channels-1));
714
                // FIXME: sanity checks
715
            }
716
        } else {
717
            mapping_setup->coupling_steps=0;
718
        }
719

    
720
        AV_DEBUG("   %d mapping coupling steps: %d \n", i, mapping_setup->coupling_steps);
721

    
722
        if(get_bits(gb, 2)) {
723
            av_log(vc->avccontext, AV_LOG_ERROR, "%d. mapping setup data invalid. \n", i);
724
            return 1; // following spec.
725
        }
726

    
727
        if (mapping_setup->submaps>1) {
728
            mapping_setup->mux=(uint_fast8_t *)av_mallocz(vc->audio_channels * sizeof(uint_fast8_t));
729
            for(j=0;j<vc->audio_channels;++j) {
730
                mapping_setup->mux[j]=get_bits(gb, 4);
731
            }
732
        }
733

    
734
        for(j=0;j<mapping_setup->submaps;++j) {
735
            get_bits(gb, 8); // FIXME check?
736
            mapping_setup->submap_floor[j]=get_bits(gb, 8);
737
            mapping_setup->submap_residue[j]=get_bits(gb, 8);
738

    
739
            AV_DEBUG("   %d mapping %d submap : floor %d, residue %d \n", i, j, mapping_setup->submap_floor[j], mapping_setup->submap_residue[j]);
740
        }
741
    }
742
    return 0;
743
}
744

    
745
// Process modes part
746

    
747
static void create_map( vorbis_context * vc, uint_fast8_t floor_number )
748
{
749
    vorbis_floor * floors=vc->floors;
750
    vorbis_floor0 * vf;
751
    int idx;
752
    int_fast8_t blockflag;
753
    int_fast32_t * map;
754
    int_fast32_t n; //TODO: could theoretically be smaller?
755

    
756
    for (blockflag=0;blockflag<2;++blockflag)
757
    {
758
    n=(blockflag ? vc->blocksize_1 : vc->blocksize_0) / 2;
759
    floors[floor_number].data.t0.map[blockflag]=
760
        av_malloc((n+1) * sizeof(int_fast32_t)); // n+sentinel
761

    
762
    map=floors[floor_number].data.t0.map[blockflag];
763
    vf=&floors[floor_number].data.t0;
764

    
765
    for (idx=0; idx<n;++idx) {
766
        map[idx]=floor( BARK((vf->rate*idx)/(2.0f*n)) *
767
                              ((vf->bark_map_size)/
768
                               BARK(vf->rate/2.0f )) );
769
        if (vf->bark_map_size-1 < map[idx]) {
770
            map[idx]=vf->bark_map_size-1;
771
        }
772
    }
773
    map[n]=-1;
774
    vf->map_size[blockflag]=n;
775
    }
776

    
777
#   ifdef V_DEBUG
778
    for(idx=0;idx<=n;++idx) {
779
        AV_DEBUG("floor0 map: map at pos %d is %d\n",
780
                 idx, map[idx]);
781
    }
782
#   endif
783
}
784

    
785
static int vorbis_parse_setup_hdr_modes(vorbis_context *vc) {
786
    GetBitContext *gb=&vc->gb;
787
    uint_fast8_t i;
788

    
789
    vc->mode_count=get_bits(gb, 6)+1;
790
    vc->modes=(vorbis_mode *)av_mallocz(vc->mode_count * sizeof(vorbis_mode));
791

    
792
    AV_DEBUG(" There are %d modes.\n", vc->mode_count);
793

    
794
    for(i=0;i<vc->mode_count;++i) {
795
        vorbis_mode *mode_setup=&vc->modes[i];
796

    
797
        mode_setup->blockflag=get_bits(gb, 1);
798
        mode_setup->windowtype=get_bits(gb, 16); //FIXME check
799
        mode_setup->transformtype=get_bits(gb, 16); //FIXME check
800
        mode_setup->mapping=get_bits(gb, 8); //FIXME check
801

    
802
        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);
803
    }
804
    return 0;
805
}
806

    
807
// Process the whole setup header using the functions above
808

    
809
static int vorbis_parse_setup_hdr(vorbis_context *vc) {
810
    GetBitContext *gb=&vc->gb;
811

    
812
    if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') ||
813
    (get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') ||
814
    (get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) {
815
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n");
816
        return 1;
817
    }
818

    
819
    if (vorbis_parse_setup_hdr_codebooks(vc)) {
820
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n");
821
        return 2;
822
    }
823
    if (vorbis_parse_setup_hdr_tdtransforms(vc)) {
824
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n");
825
        return 3;
826
    }
827
    if (vorbis_parse_setup_hdr_floors(vc)) {
828
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n");
829
        return 4;
830
    }
831
    if (vorbis_parse_setup_hdr_residues(vc)) {
832
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n");
833
        return 5;
834
    }
835
    if (vorbis_parse_setup_hdr_mappings(vc)) {
836
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n");
837
        return 6;
838
    }
839
    if (vorbis_parse_setup_hdr_modes(vc)) {
840
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n");
841
        return 7;
842
    }
843
    if (!get_bits1(gb)) {
844
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n");
845
        return 8; // framing flag bit unset error
846
    }
847

    
848
    return 0;
849
}
850

    
851
// Process the identification header
852

    
853
static int vorbis_parse_id_hdr(vorbis_context *vc){
854
    GetBitContext *gb=&vc->gb;
855
    uint_fast8_t bl0, bl1;
856
    const float *vwin[8]={ vwin64, vwin128, vwin256, vwin512, vwin1024, vwin2048, vwin4096, vwin8192 };
857

    
858
    if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') ||
859
    (get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') ||
860
    (get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) {
861
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n");
862
        return 1;
863
    }
864

    
865
    vc->version=get_bits_long_le(gb, 32);    //FIXME check 0
866
    vc->audio_channels=get_bits(gb, 8);   //FIXME check >0
867
    vc->audio_samplerate=get_bits_long_le(gb, 32);   //FIXME check >0
868
    vc->bitrate_maximum=get_bits_long_le(gb, 32);
869
    vc->bitrate_nominal=get_bits_long_le(gb, 32);
870
    vc->bitrate_minimum=get_bits_long_le(gb, 32);
871
    bl0=get_bits(gb, 4);
872
    bl1=get_bits(gb, 4);
873
    vc->blocksize_0=(1<<bl0);
874
    vc->blocksize_1=(1<<bl1);
875
    if (bl0>13 || bl0<6 || bl1>13 || bl1<6) {
876
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n");
877
        return 3;
878
    }
879
    vc->swin=vwin[bl0-6];
880
    vc->lwin=vwin[bl1-6];
881

    
882
    if ((get_bits1(gb)) == 0) {
883
        av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n");
884
        return 2;
885
    }
886

    
887
    vc->channel_residues=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
888
    vc->channel_floors=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
889
    vc->saved=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
890
    vc->ret=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
891
    vc->buf=(float *)av_malloc(vc->blocksize_1 * sizeof(float));
892
    vc->buf_tmp=(float *)av_malloc(vc->blocksize_1 * sizeof(float));
893
    vc->saved_start=0;
894

    
895
    ff_mdct_init(&vc->mdct0, bl0, 1);
896
    ff_mdct_init(&vc->mdct1, bl1, 1);
897

    
898
    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 ",
899
            vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize_0, vc->blocksize_1);
900

    
901
/*
902
    BLK=vc->blocksize_0;
903
    for(i=0;i<BLK/2;++i) {
904
        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)));
905
    }
906
*/
907

    
908
    return 0;
909
}
910

    
911
// Process the extradata using the functions above (identification header, setup header)
912

    
913
static int vorbis_decode_init(AVCodecContext *avccontext) {
914
    vorbis_context *vc = avccontext->priv_data ;
915
    uint8_t *headers = avccontext->extradata;
916
    int headers_len=avccontext->extradata_size;
917
    uint8_t *header_start[3];
918
    int header_len[3];
919
    GetBitContext *gb = &(vc->gb);
920
    int i, j, hdr_type;
921

    
922
    vc->avccontext = avccontext;
923

    
924
    if (!headers_len) {
925
        av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
926
        return -1;
927
    }
928

    
929
    if(headers[0] == 0 && headers[1] == 30) {
930
        for(i = 0; i < 3; i++){
931
            header_len[i] = *headers++ << 8;
932
            header_len[i] += *headers++;
933
            header_start[i] = headers;
934
            headers += header_len[i];
935
        }
936
    } else if(headers[0] == 2) {
937
        for(j=1,i=0;i<2;++i, ++j) {
938
            header_len[i]=0;
939
            while(j<headers_len && headers[j]==0xff) {
940
                header_len[i]+=0xff;
941
                ++j;
942
            }
943
            if (j>=headers_len) {
944
                av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
945
                return -1;
946
            }
947
            header_len[i]+=headers[j];
948
        }
949
        header_len[2]=headers_len-header_len[0]-header_len[1]-j;
950
        headers+=j;
951
        header_start[0] = headers;
952
        header_start[1] = header_start[0] + header_len[0];
953
        header_start[2] = header_start[1] + header_len[1];
954
    } else {
955
        av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
956
        return -1;
957
    }
958

    
959
    init_get_bits(gb, header_start[0], header_len[0]*8);
960
    hdr_type=get_bits(gb, 8);
961
    if (hdr_type!=1) {
962
        av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n");
963
        return -1;
964
    }
965
    if (vorbis_parse_id_hdr(vc)) {
966
        av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n");
967
        vorbis_free(vc);
968
        return -1;
969
    }
970

    
971
    init_get_bits(gb, header_start[2], header_len[2]*8);
972
    hdr_type=get_bits(gb, 8);
973
    if (hdr_type!=5) {
974
        av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");
975
        return -1;
976
    }
977
    if (vorbis_parse_setup_hdr(vc)) {
978
        av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");
979
        vorbis_free(vc);
980
        return -1;
981
    }
982

    
983
    avccontext->channels = vc->audio_channels;
984
    avccontext->sample_rate = vc->audio_samplerate;
985

    
986
    return 0 ;
987
}
988

    
989
// Decode audiopackets -------------------------------------------------
990

    
991
// Read and decode floor
992

    
993
static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,
994
                                         vorbis_floor_data *vfu, float *vec) {
995
    vorbis_floor0 * vf=&vfu->t0;
996
    float * lsp=vf->lsp;
997
    uint_fast32_t amplitude;
998
    uint_fast32_t book_idx;
999
    uint_fast8_t blockflag=vc->modes[vc->mode_number].blockflag;
1000

    
1001
    amplitude=get_bits(&vc->gb, vf->amplitude_bits);
1002
    if (amplitude>0) {
1003
        float last = 0;
1004
        uint_fast16_t lsp_len = 0;
1005
        uint_fast16_t idx;
1006
        vorbis_codebook codebook;
1007

    
1008
        book_idx=get_bits(&vc->gb, ilog(vf->num_books));
1009
        if ( book_idx >= vf->num_books ) {
1010
            av_log( vc->avccontext, AV_LOG_ERROR,
1011
                    "floor0 dec: booknumber too high!\n" );
1012
            //FIXME: look above
1013
        }
1014
        AV_DEBUG( "floor0 dec: booknumber: %u\n", book_idx );
1015
        codebook=vc->codebooks[vf->book_list[book_idx]];
1016

    
1017
        while (lsp_len<vf->order) {
1018
            int vec_off;
1019

    
1020
            AV_DEBUG( "floor0 dec: book dimension: %d\n", codebook.dimensions );
1021
            AV_DEBUG( "floor0 dec: maximum depth: %d\n", codebook.maxdepth );
1022
            /* read temp vector */
1023
            vec_off=get_vlc2(&vc->gb,
1024
                             codebook.vlc.table,
1025
                             codebook.nb_bits,
1026
                             codebook.maxdepth ) *
1027
                             codebook.dimensions;
1028
            AV_DEBUG( "floor0 dec: vector offset: %d\n", vec_off );
1029
            /* copy each vector component and add last to it */
1030
            for (idx=0; idx<codebook.dimensions; ++idx) {
1031
                lsp[lsp_len+idx]=codebook.codevectors[vec_off+idx]+last;
1032
            }
1033
            last=lsp[lsp_len+idx-1]; /* set last to last vector component */
1034

    
1035
            lsp_len += codebook.dimensions;
1036
        }
1037
#ifdef V_DEBUG
1038
        /* DEBUG: output lsp coeffs */
1039
        {
1040
            int idx;
1041
            for ( idx = 0; idx < lsp_len; ++idx )
1042
                AV_DEBUG("floor0 dec: coeff at %d is %f\n", idx, lsp[idx] );
1043
        }
1044
#endif
1045

    
1046
        /* synthesize floor output vector */
1047
        {
1048
            int i;
1049
            int order=vf->order;
1050
            float wstep=M_PI/vf->bark_map_size;
1051

    
1052
            for(i=0;i<order;i++) { lsp[i]=2.0f*cos(lsp[i]); }
1053

    
1054
            AV_DEBUG("floor0 synth: map_size=%d; m=%d; wstep=%f\n",
1055
                     vf->map_size, order, wstep);
1056

    
1057
            i=0;
1058
            while(i<vf->map_size[blockflag]) {
1059
                int j, iter_cond=vf->map[blockflag][i];
1060
                float p=0.5f;
1061
                float q=0.5f;
1062
                float two_cos_w=2.0f*cos(wstep*iter_cond); // needed all times
1063

    
1064
                /* similar part for the q and p products */
1065
                for(j=0;j<order;j+=2) {
1066
                    q *= lsp[j]  -two_cos_w;
1067
                    p *= lsp[j+1]-two_cos_w;
1068
                }
1069
                if(j==order) { // even order
1070
                    p *= p*(2.0f-two_cos_w);
1071
                    q *= q*(2.0f+two_cos_w);
1072
                }
1073
                else { // odd order
1074
                    q *= two_cos_w-lsp[j]; // one more time for q
1075

    
1076
                    /* final step and square */
1077
                    p *= p*(4.f-two_cos_w*two_cos_w);
1078
                    q *= q;
1079
                }
1080

    
1081
                /* calculate linear floor value */
1082
                {
1083
                    q=exp( (
1084
                             ( (amplitude*vf->amplitude_offset)/
1085
                               (((1<<vf->amplitude_bits)-1) * sqrt(p+q)) )
1086
                             - vf->amplitude_offset ) * .11512925f
1087
                         );
1088
                }
1089

    
1090
                /* fill vector */
1091
                do { vec[i]=q; ++i; }while(vf->map[blockflag][i]==iter_cond);
1092
            }
1093
        }
1094
    }
1095
    else {
1096
        /* this channel is unused */
1097
        return 1;
1098
    }
1099

    
1100
    AV_DEBUG(" Floor0 decoded\n");
1101

    
1102
    return 0;
1103
}
1104
static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc, vorbis_floor_data *vfu, float *vec) {
1105
    vorbis_floor1 * vf=&vfu->t1;
1106
    GetBitContext *gb=&vc->gb;
1107
    uint_fast16_t range_v[4]={ 256, 128, 86, 64 };
1108
    uint_fast16_t range=range_v[vf->multiplier-1];
1109
    uint_fast16_t floor1_Y[vf->x_list_dim];
1110
    uint_fast16_t floor1_Y_final[vf->x_list_dim];
1111
    uint_fast8_t floor1_flag[vf->x_list_dim];
1112
    uint_fast8_t class_;
1113
    uint_fast8_t cdim;
1114
    uint_fast8_t cbits;
1115
    uint_fast8_t csub;
1116
    uint_fast8_t cval;
1117
    int_fast16_t book;
1118
    uint_fast16_t offset;
1119
    uint_fast16_t i,j;
1120
    uint_fast16_t *floor_x_sort=vf->x_list_order;
1121
    /*u*/int_fast16_t adx, ady, off, predicted; // WTF ? dy/adx= (unsigned)dy/adx ?
1122
    int_fast16_t dy, err;
1123
    uint_fast16_t lx,hx, ly, hy=0;
1124

    
1125

    
1126
    if (!get_bits1(gb)) return 1; // silence
1127

    
1128
// Read values (or differences) for the floor's points
1129

    
1130
    floor1_Y[0]=get_bits(gb, ilog(range-1));
1131
    floor1_Y[1]=get_bits(gb, ilog(range-1));
1132

    
1133
    AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);
1134

    
1135
    offset=2;
1136
    for(i=0;i<vf->partitions;++i) {
1137
        class_=vf->partition_class[i];
1138
        cdim=vf->class_dimensions[class_];
1139
        cbits=vf->class_subclasses[class_];
1140
        csub=(1<<cbits)-1;
1141
        cval=0;
1142

    
1143
        AV_DEBUG("Cbits %d \n", cbits);
1144

    
1145
        if (cbits) { // this reads all subclasses for this partition's class
1146
            cval=get_vlc2(gb, vc->codebooks[vf->class_masterbook[class_]].vlc.table,
1147
            vc->codebooks[vf->class_masterbook[class_]].nb_bits, 3);
1148
        }
1149

    
1150
        for(j=0;j<cdim;++j) {
1151
            book=vf->subclass_books[class_][cval & csub];
1152

    
1153
            AV_DEBUG("book %d Cbits %d cval %d  bits:%d \n", book, cbits, cval, get_bits_count(gb));
1154

    
1155
            cval=cval>>cbits;
1156
            if (book>0) {
1157
                floor1_Y[offset+j]=get_vlc2(gb, vc->codebooks[book].vlc.table,
1158
                vc->codebooks[book].nb_bits, 3);
1159
            } else {
1160
                floor1_Y[offset+j]=0;
1161
            }
1162

    
1163
            AV_DEBUG(" floor(%d) = %d \n", vf->x_list[offset+j], floor1_Y[offset+j]);
1164
        }
1165
        offset+=cdim;
1166
    }
1167

    
1168
// Amplitude calculation from the differences
1169

    
1170
    floor1_flag[0]=1;
1171
    floor1_flag[1]=1;
1172
    floor1_Y_final[0]=floor1_Y[0];
1173
    floor1_Y_final[1]=floor1_Y[1];
1174

    
1175
    for(i=2;i<vf->x_list_dim;++i) {
1176
        uint_fast16_t val, highroom, lowroom, room;
1177
        uint_fast16_t high_neigh_offs;
1178
        uint_fast16_t low_neigh_offs;
1179

    
1180
        low_neigh_offs=vf->low_neighbour[i];
1181
        high_neigh_offs=vf->high_neighbour[i];
1182
        dy=floor1_Y_final[high_neigh_offs]-floor1_Y_final[low_neigh_offs];  // render_point begin
1183
        adx=vf->x_list[high_neigh_offs]-vf->x_list[low_neigh_offs];
1184
        ady= ABS(dy);
1185
        err=ady*(vf->x_list[i]-vf->x_list[low_neigh_offs]);
1186
        off=err/adx;
1187
        if (dy<0) {
1188
            predicted=floor1_Y_final[low_neigh_offs]-off;
1189
        } else {
1190
            predicted=floor1_Y_final[low_neigh_offs]+off;
1191
        } // render_point end
1192

    
1193
        val=floor1_Y[i];
1194
        highroom=range-predicted;
1195
        lowroom=predicted;
1196
        if (highroom < lowroom) {
1197
            room=highroom*2;
1198
        } else {
1199
            room=lowroom*2;   // SPEC mispelling
1200
        }
1201
        if (val) {
1202
            floor1_flag[low_neigh_offs]=1;
1203
            floor1_flag[high_neigh_offs]=1;
1204
            floor1_flag[i]=1;
1205
            if (val>=room) {
1206
                if (highroom > lowroom) {
1207
                    floor1_Y_final[i]=val-lowroom+predicted;
1208
                } else {
1209
                    floor1_Y_final[i]=predicted-val+highroom-1;
1210
                }
1211
            } else {
1212
                if (val & 1) {
1213
                    floor1_Y_final[i]=predicted-(val+1)/2;
1214
                } else {
1215
                    floor1_Y_final[i]=predicted+val/2;
1216
                }
1217
            }
1218
        } else {
1219
            floor1_flag[i]=0;
1220
            floor1_Y_final[i]=predicted;
1221
        }
1222

    
1223
        AV_DEBUG(" Decoded floor(%d) = %d / val %d \n", vf->x_list[i], floor1_Y_final[i], val);
1224
    }
1225

    
1226
// Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?
1227

    
1228
    hx=0;
1229
    lx=0;
1230
    ly=floor1_Y_final[0]*vf->multiplier;  // conforms to SPEC
1231

    
1232
    vec[0]=floor1_inverse_db_table[ly];
1233

    
1234
    for(i=1;i<vf->x_list_dim;++i) {
1235
        AV_DEBUG(" Looking at post %d \n", i);
1236

    
1237
        if (floor1_flag[floor_x_sort[i]]) {   // SPEC mispelled
1238
            int_fast16_t x, y, dy, base, sy; // if uncommented: dy = -32 adx = 2  base = 2blablabla ?????
1239

    
1240
            hy=floor1_Y_final[floor_x_sort[i]]*vf->multiplier;
1241
            hx=vf->x_list[floor_x_sort[i]];
1242

    
1243
            dy=hy-ly;
1244
            adx=hx-lx;
1245
            ady= (dy<0) ? -dy:dy;//ABS(dy);
1246
            base=dy/adx;
1247

    
1248
            AV_DEBUG(" dy %d  adx %d base %d = %d \n", dy, adx, base, dy/adx);
1249

    
1250
            x=lx;
1251
            y=ly;
1252
            err=0;
1253
            if (dy<0) {
1254
                sy=base-1;
1255
            } else {
1256
                sy=base+1;
1257
            }
1258
            ady=ady-(base<0 ? -base : base)*adx;
1259
            vec[x]=floor1_inverse_db_table[y];
1260

    
1261
            AV_DEBUG(" vec[ %d ] = %d \n", x, y);
1262

    
1263
            for(x=lx+1;(x<hx) && (x<vf->x_list[1]);++x) {
1264
                err+=ady;
1265
                if (err>=adx) {
1266
                    err-=adx;
1267
                    y+=sy;
1268
                } else {
1269
                    y+=base;
1270
                }
1271
                vec[x]=floor1_inverse_db_table[y];
1272

    
1273
                AV_DEBUG(" vec[ %d ] = %d \n", x, y);
1274
            }
1275

    
1276
/*            for(j=1;j<hx-lx+1;++j) {  // iterating render_point
1277
                dy=hy-ly;
1278
                adx=hx-lx;
1279
                ady= dy<0 ? -dy : dy;
1280
                err=ady*j;
1281
                off=err/adx;
1282
                if (dy<0) {
1283
                    predicted=ly-off;
1284
                } else {
1285
                    predicted=ly+off;
1286
                }
1287
                if (lx+j < vf->x_list[1]) {
1288
                    vec[lx+j]=floor1_inverse_db_table[predicted];
1289
                }
1290
            }*/
1291

    
1292
            lx=hx;
1293
            ly=hy;
1294
        }
1295
    }
1296

    
1297
    if (hx<vf->x_list[1]) {
1298
        for(i=hx;i<vf->x_list[1];++i) {
1299
            vec[i]=floor1_inverse_db_table[hy];
1300
        }
1301
    }
1302

    
1303
    AV_DEBUG(" Floor decoded\n");
1304

    
1305
    return 0;
1306
}
1307

    
1308
// Read and decode residue
1309

    
1310
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) {
1311
    GetBitContext *gb=&vc->gb;
1312
    uint_fast8_t c_p_c=vc->codebooks[vr->classbook].dimensions;
1313
    uint_fast16_t n_to_read=vr->end-vr->begin;
1314
    uint_fast16_t ptns_to_read=n_to_read/vr->partition_size;
1315
    uint_fast8_t classifs[ptns_to_read*vc->audio_channels];
1316
    uint_fast8_t pass;
1317
    uint_fast8_t ch_used;
1318
    uint_fast8_t i,j,l;
1319
    uint_fast16_t k;
1320

    
1321
    if (vr->type==2) {
1322
        for(j=1;j<ch;++j) {
1323
                do_not_decode[0]&=do_not_decode[j];  // FIXME - clobbering input
1324
        }
1325
        if (do_not_decode[0]) return 0;
1326
        ch_used=1;
1327
    } else {
1328
        ch_used=ch;
1329
    }
1330

    
1331
    AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);
1332

    
1333
    for(pass=0;pass<=vr->maxpass;++pass) { // FIXME OPTIMIZE?
1334
        uint_fast16_t voffset;
1335
        uint_fast16_t partition_count;
1336
        uint_fast16_t j_times_ptns_to_read;
1337

    
1338
        voffset=vr->begin;
1339
        for(partition_count=0;partition_count<ptns_to_read;) {  // SPEC        error
1340
            if (!pass) {
1341
                for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {
1342
                    if (!do_not_decode[j]) {
1343
                        uint_fast32_t temp=get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,
1344
                        vc->codebooks[vr->classbook].nb_bits, 3);
1345

    
1346
                        AV_DEBUG("Classword: %d \n", temp);
1347

    
1348
                        assert(vr->classifications > 1 && temp<=65536); //needed for inverse[]
1349
                        for(i=0;i<c_p_c;++i) {
1350
                            uint_fast32_t temp2;
1351

    
1352
                            temp2=(((uint_fast64_t)temp) * inverse[vr->classifications])>>32;
1353
                            classifs[j_times_ptns_to_read+partition_count+c_p_c-1-i]=temp-temp2*vr->classifications;
1354
                            temp=temp2;
1355
                        }
1356
                    }
1357
                    j_times_ptns_to_read+=ptns_to_read;
1358
                }
1359
            }
1360
            for(i=0;(i<c_p_c) && (partition_count<ptns_to_read);++i) {
1361
                for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {
1362
                    uint_fast16_t voffs;
1363

    
1364
                    if (!do_not_decode[j]) {
1365
                        uint_fast8_t vqclass=classifs[j_times_ptns_to_read+partition_count];
1366
                        int_fast16_t vqbook=vr->books[vqclass][pass];
1367

    
1368
                        if (vqbook>=0) {
1369
                            uint_fast16_t coffs;
1370
                            uint_fast16_t step=vr->partition_size/vc->codebooks[vqbook].dimensions;
1371
                            vorbis_codebook codebook= vc->codebooks[vqbook];
1372

    
1373
                            if (vr->type==0) {
1374

    
1375
                                voffs=voffset+j*vlen;
1376
                                for(k=0;k<step;++k) {
1377
                                    coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * codebook.dimensions;
1378
                                    for(l=0;l<codebook.dimensions;++l) {
1379
                                        vec[voffs+k+l*step]+=codebook.codevectors[coffs+l];  // FPMATH
1380
                                    }
1381
                                }
1382
                            }
1383
                            else if (vr->type==1) {
1384
                                voffs=voffset+j*vlen;
1385
                                for(k=0;k<step;++k) {
1386
                                    coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * codebook.dimensions;
1387
                                    for(l=0;l<codebook.dimensions;++l, ++voffs) {
1388
                                        vec[voffs]+=codebook.codevectors[coffs+l];  // FPMATH
1389

    
1390
                                        AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d  \n", pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);
1391
                                    }
1392
                                }
1393
                            }
1394
                            else if (vr->type==2 && ch==2 && (voffset&1)==0 && (codebook.dimensions&1)==0) { // most frequent case optimized
1395
                                voffs=voffset>>1;
1396

    
1397
                                for(k=0;k<step;++k) {
1398
                                    coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * codebook.dimensions;
1399
                                    for(l=0;l<codebook.dimensions;l+=2, voffs++) {
1400
                                        vec[voffs     ]+=codebook.codevectors[coffs+l  ];  // FPMATH
1401
                                        vec[voffs+vlen]+=codebook.codevectors[coffs+l+1];  // FPMATH
1402

    
1403
                                        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);
1404
                                    }
1405
                                }
1406

    
1407
                            }
1408
                            else if (vr->type==2) {
1409
                                voffs=voffset;
1410

    
1411
                                for(k=0;k<step;++k) {
1412
                                    coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * codebook.dimensions;
1413
                                    for(l=0;l<codebook.dimensions;++l, ++voffs) {
1414
                                        vec[voffs/ch+(voffs%ch)*vlen]+=codebook.codevectors[coffs+l];  // FPMATH FIXME use if and counter instead of / and %
1415

    
1416
                                        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);
1417
                                    }
1418
                                }
1419
                            } else {
1420
                                av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");
1421
                                return 1;
1422
                            }
1423
                        }
1424
                    }
1425
                    j_times_ptns_to_read+=ptns_to_read;
1426
                }
1427
                ++partition_count;
1428
                voffset+=vr->partition_size;
1429
            }
1430
        }
1431
    }
1432
    return 0;
1433
}
1434

    
1435
// Decode the audio packet using the functions above
1436
#define BIAS 385
1437

    
1438
static int vorbis_parse_audio_packet(vorbis_context *vc) {
1439
    GetBitContext *gb=&vc->gb;
1440

    
1441
    uint_fast8_t previous_window=0,next_window=0;
1442
    uint_fast8_t mode_number;
1443
    uint_fast16_t blocksize;
1444
    int_fast32_t i,j;
1445
    uint_fast8_t no_residue[vc->audio_channels];
1446
    uint_fast8_t do_not_decode[vc->audio_channels];
1447
    vorbis_mapping *mapping;
1448
    float *ch_res_ptr=vc->channel_residues;
1449
    float *ch_floor_ptr=vc->channel_floors;
1450
    uint_fast8_t res_chan[vc->audio_channels];
1451
    uint_fast8_t res_num=0;
1452
    int_fast16_t retlen=0;
1453
    uint_fast16_t saved_start=0;
1454

    
1455
    if (get_bits1(gb)) {
1456
        av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");
1457
        return -1; // packet type not audio
1458
    }
1459

    
1460
    if (vc->mode_count==1) {
1461
        mode_number=0;
1462
    } else {
1463
        mode_number=get_bits(gb, ilog(vc->mode_count-1));
1464
    }
1465
    vc->mode_number=mode_number;
1466
    mapping=&vc->mappings[vc->modes[mode_number].mapping];
1467

    
1468
    AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);
1469

    
1470
    if (vc->modes[mode_number].blockflag) {
1471
        previous_window=get_bits1(gb);
1472
        next_window=get_bits1(gb);
1473
    }
1474

    
1475
    blocksize=vc->modes[mode_number].blockflag ? vc->blocksize_1 : vc->blocksize_0;
1476
    memset(ch_res_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?
1477
    memset(ch_floor_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?
1478

    
1479
// Decode floor
1480

    
1481
    for(i=0;i<vc->audio_channels;++i) {
1482
        vorbis_floor *floor;
1483
        if (mapping->submaps>1) {
1484
            floor=&vc->floors[mapping->submap_floor[mapping->mux[i]]];
1485
        } else {
1486
            floor=&vc->floors[mapping->submap_floor[0]];
1487
        }
1488

    
1489
        no_residue[i]=floor->decode(vc, &floor->data, ch_floor_ptr);
1490
        ch_floor_ptr+=blocksize/2;
1491
    }
1492

    
1493
// Nonzero vector propagate
1494

    
1495
    for(i=mapping->coupling_steps-1;i>=0;--i) {
1496
        if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {
1497
            no_residue[mapping->magnitude[i]]=0;
1498
            no_residue[mapping->angle[i]]=0;
1499
        }
1500
    }
1501

    
1502
// Decode residue
1503

    
1504
    for(i=0;i<mapping->submaps;++i) {
1505
        vorbis_residue *residue;
1506
        uint_fast8_t ch=0;
1507

    
1508
        for(j=0;j<vc->audio_channels;++j) {
1509
            if ((mapping->submaps==1) || (i=mapping->mux[j])) {
1510
                res_chan[j]=res_num;
1511
                if (no_residue[j]) {
1512
                    do_not_decode[ch]=1;
1513
                } else {
1514
                    do_not_decode[ch]=0;
1515
                }
1516
                ++ch;
1517
                ++res_num;
1518
            }
1519
        }
1520
        residue=&vc->residues[mapping->submap_residue[i]];
1521
        vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);
1522

    
1523
        ch_res_ptr+=ch*blocksize/2;
1524
    }
1525

    
1526
// Inverse coupling
1527

    
1528
    for(i=mapping->coupling_steps-1;i>=0;--i) { //warning: i has to be signed
1529
        float *mag, *ang;
1530

    
1531
        mag=vc->channel_residues+res_chan[mapping->magnitude[i]]*blocksize/2;
1532
        ang=vc->channel_residues+res_chan[mapping->angle[i]]*blocksize/2;
1533
        for(j=0;j<blocksize/2;++j) {
1534
            float temp;
1535
            if (mag[j]>0.0) {
1536
                if (ang[j]>0.0) {
1537
                    ang[j]=mag[j]-ang[j];
1538
                } else {
1539
                    temp=ang[j];
1540
                    ang[j]=mag[j];
1541
                    mag[j]+=temp;
1542
                }
1543
            } else {
1544
                if (ang[j]>0.0) {
1545
                    ang[j]+=mag[j];
1546
                } else {
1547
                    temp=ang[j];
1548
                    ang[j]=mag[j];
1549
                    mag[j]-=temp;
1550
                }
1551
            }
1552
        }
1553
    }
1554

    
1555
// Dotproduct
1556

    
1557
    for(j=0, ch_floor_ptr=vc->channel_floors;j<vc->audio_channels;++j,ch_floor_ptr+=blocksize/2) {
1558
        ch_res_ptr=vc->channel_residues+res_chan[j]*blocksize/2;
1559

    
1560
        for(i=0;i<blocksize/2;++i) {
1561
            ch_floor_ptr[i]*=ch_res_ptr[i]; //FPMATH
1562
        }
1563
    }
1564

    
1565
// MDCT, overlap/add, save data for next overlapping  FPMATH
1566

    
1567
    for(j=0;j<vc->audio_channels;++j) {
1568
        uint_fast8_t step=vc->audio_channels;
1569
        uint_fast16_t k;
1570
        float *saved=vc->saved+j*vc->blocksize_1/2;
1571
        float *ret=vc->ret;
1572
        const float *lwin=vc->lwin;
1573
        const float *swin=vc->swin;
1574
        float *buf=vc->buf;
1575
        float *buf_tmp=vc->buf_tmp;
1576

    
1577
        ch_floor_ptr=vc->channel_floors+j*blocksize/2;
1578

    
1579
        saved_start=vc->saved_start;
1580

    
1581
        ff_imdct_calc(vc->modes[mode_number].blockflag ? &vc->mdct1 : &vc->mdct0, buf, ch_floor_ptr, buf_tmp);
1582

    
1583
        if (vc->modes[mode_number].blockflag) {
1584
            // -- overlap/add
1585
            if (previous_window) {
1586
                for(k=j, i=0;i<vc->blocksize_1/2;++i, k+=step) {
1587
                    ret[k]=saved[i]+buf[i]*lwin[i]+BIAS;
1588
                }
1589
                retlen=vc->blocksize_1/2;
1590
            } else {
1591
                buf += (vc->blocksize_1-vc->blocksize_0)/4;
1592
                for(k=j, i=0;i<vc->blocksize_0/2;++i, k+=step) {
1593
                    ret[k]=saved[i]+buf[i]*swin[i]+BIAS;
1594
                }
1595
                buf += vc->blocksize_0/2;
1596
                for(i=0;i<(vc->blocksize_1-vc->blocksize_0)/4;++i, k+=step) {
1597
                    ret[k]=buf[i]+BIAS;
1598
                }
1599
                buf=vc->buf;
1600
                retlen=vc->blocksize_0/2+(vc->blocksize_1-vc->blocksize_0)/4;
1601
            }
1602
            // -- save
1603
            if (next_window) {
1604
                buf += vc->blocksize_1/2;
1605
                lwin += vc->blocksize_1/2-1;
1606
                for(i=0;i<vc->blocksize_1/2;++i) {
1607
                    saved[i]=buf[i]*lwin[-i];
1608
                }
1609
                saved_start=0;
1610
            } else {
1611
                saved_start=(vc->blocksize_1-vc->blocksize_0)/4;
1612
                buf += vc->blocksize_1/2;
1613
                for(i=0;i<saved_start;++i) {
1614
                    saved[i]=buf[i];
1615
                }
1616
                swin += vc->blocksize_0/2-1;
1617
                for(i=0;i<vc->blocksize_0/2;++i) {
1618
                    saved[saved_start+i]=buf[saved_start+i]*swin[-i];
1619
                }
1620
            }
1621
        } else {
1622
            // --overlap/add
1623
            for(k=j, i=0;i<saved_start;++i, k+=step) {
1624
                ret[k]=saved[i]+BIAS;
1625
            }
1626
            for(i=0;i<vc->blocksize_0/2;++i, k+=step) {
1627
                ret[k]=saved[saved_start+i]+buf[i]*swin[i]+BIAS;
1628
            }
1629
            retlen=saved_start+vc->blocksize_0/2;
1630
            // -- save
1631
            buf += vc->blocksize_0/2;
1632
            swin += vc->blocksize_0/2-1;
1633
            for(i=0;i<vc->blocksize_0/2;++i) {
1634
                saved[i]=buf[i]*swin[-i];
1635
            }
1636
            saved_start=0;
1637
        }
1638
    }
1639
    vc->saved_start=saved_start;
1640

    
1641
    return retlen*vc->audio_channels;
1642
}
1643

    
1644
// Return the decoded audio packet through the standard api
1645

    
1646
static int vorbis_decode_frame(AVCodecContext *avccontext,
1647
                        void *data, int *data_size,
1648
                        uint8_t *buf, int buf_size)
1649
{
1650
    vorbis_context *vc = avccontext->priv_data ;
1651
    GetBitContext *gb = &(vc->gb);
1652

    
1653
    int_fast16_t i, len;
1654

    
1655
    if(!buf_size){
1656
        return 0;
1657
    }
1658

    
1659
    AV_DEBUG("packet length %d \n", buf_size);
1660

    
1661
    init_get_bits(gb, buf, buf_size*8);
1662

    
1663
    len=vorbis_parse_audio_packet(vc);
1664

    
1665
    if (len<=0) {
1666
        *data_size=0;
1667
        return buf_size;
1668
    }
1669

    
1670
    if (!vc->first_frame) {
1671
        vc->first_frame=1;
1672
        *data_size=0;
1673
        return buf_size ;
1674
    }
1675

    
1676
    AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);
1677

    
1678
    for(i=0;i<len;++i) {
1679
        int_fast32_t tmp= ((int32_t*)vc->ret)[i];
1680
        if(tmp & 0xf0000){
1681
//            tmp= (0x43c0ffff - tmp)>>31; //ask gcc devs why this is slower
1682
            if(tmp > 0x43c0ffff) tmp= 0xFFFF;
1683
            else                 tmp= 0;
1684
        }
1685
        ((int16_t*)data)[i]=tmp - 0x8000;
1686
    }
1687

    
1688
    *data_size=len*2;
1689

    
1690
    return buf_size ;
1691
}
1692

    
1693
// Close decoder
1694

    
1695
static int vorbis_decode_close(AVCodecContext *avccontext) {
1696
    vorbis_context *vc = avccontext->priv_data;
1697

    
1698
    vorbis_free(vc);
1699

    
1700
    return 0 ;
1701
}
1702

    
1703
AVCodec vorbis_decoder = {
1704
    "vorbis",
1705
    CODEC_TYPE_AUDIO,
1706
    CODEC_ID_VORBIS,
1707
    sizeof(vorbis_context),
1708
    vorbis_decode_init,
1709
    NULL,
1710
    vorbis_decode_close,
1711
    vorbis_decode_frame,
1712
};
1713