Vorbis sse fix by (Balatoni Denes: dbalatoni, programozo hu)
[ffmpeg.git] / libavcodec / vorbis.c
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
17  * License along with this library; if not, write to the Free Software
18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  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 11
34 #define V_MAX_VLCS (1<<16)
35
36 #ifndef V_DEBUG
37 #define AV_DEBUG(...)
38 #endif
39
40
41
42 /* Helper functions */
43
44 /**
45  *  reads 0-32 bits when using the ALT_BITSTREAM_READER_LE bitstream reader
46  */
47 unsigned int get_bits_long_le(GetBitContext *s, int n){
48     if(n<=17) return get_bits(s, n);
49     else{
50         int ret= get_bits(s, 16);
51         return ret | (get_bits(s, n-16) << 16);
52     }
53 }
54
55 static unsigned int ilog(unsigned int i) { // unfortunatelly av_log2 uses different rounding
56     unsigned int ret=0;
57     while (i!=0) {
58         ++ret;
59         i>>=1;
60     }
61     return ret;
62 }
63
64 static unsigned int nth_root(unsigned int x, unsigned int n) {   // x^(1/n)
65     unsigned int ret=0, i, j;
66
67     do {
68         ++ret;
69         for(i=0,j=ret;i<n-1;i++) j*=ret;
70     } while (j<=x);
71
72     return (ret-1);
73 }
74
75 static float vorbisfloat2float(uint_fast32_t val) {
76     double mant=val&0x1fffff;
77     long exp=(val&0x7fe00000L)>>21;
78     if (val&0x80000000) mant=-mant;
79     return(ldexp(mant, exp-20-768));
80 }
81
82
83 // Generate vlc codes from vorbis huffman code lengths
84
85 static int vorbis_len2vlc(vorbis_context *vc, uint_fast8_t *bits, uint_fast32_t *codes, uint_fast32_t num) {
86     uint_fast32_t exit_at_level[33]={404,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
87         0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
88
89     uint_fast8_t i,j;
90     uint_fast32_t code,p;
91
92 #ifdef V_DEBUG
93     GetBitContext gb;
94 #endif
95
96     for(p=0;(bits[p]==0) && (p<num);++p);
97     if (p==num) {
98 //        av_log(vc->avccontext, AV_LOG_INFO, "An empty codebook. Heh?! \n");
99         return 0;
100     }
101
102     codes[p]=0;
103     for(i=0;i<bits[p];++i) {
104         exit_at_level[i+1]=1<<i;
105     }
106
107 #ifdef V_DEBUG
108     av_log(vc->avccontext, AV_LOG_INFO, " %d. of %d code len %d code %d - ", p, num, bits[p], codes[p]);
109     init_get_bits(&gb, (uint_fast8_t *)&codes[p], bits[p]);
110     for(i=0;i<bits[p];++i) {
111         av_log(vc->avccontext, AV_LOG_INFO, "%s", get_bits1(&gb) ? "1" : "0");
112     }
113     av_log(vc->avccontext, AV_LOG_INFO, "\n");
114 #endif
115
116     ++p;
117
118     for(;p<num;++p) {
119         if (bits[p]==0) continue;
120         // find corresponding exit(node which the tree can grow further from)
121         for(i=bits[p];i>0;--i) {
122             if (exit_at_level[i]) break;
123         }
124         if (!i) return 1; // overspecified tree
125         code=exit_at_level[i];
126         exit_at_level[i]=0;
127         // construct code (append 0s to end) and introduce new exits
128         for(j=i+1;j<=bits[p];++j) {
129             exit_at_level[j]=code+(1<<(j-1));
130         }
131         codes[p]=code;
132
133 #ifdef V_DEBUG
134         av_log(vc->avccontext, AV_LOG_INFO, " %d. code len %d code %d - ", p, bits[p], codes[p]);
135         init_get_bits(&gb, (uint_fast8_t *)&codes[p], bits[p]);
136         for(i=0;i<bits[p];++i) {
137             av_log(vc->avccontext, AV_LOG_INFO, "%s", get_bits1(&gb) ? "1" : "0");
138         }
139         av_log(vc->avccontext, AV_LOG_INFO, "\n");
140 #endif
141
142     }
143
144     //FIXME no exits should be left (underspecified tree - ie. unused valid vlcs - not allowed by SPEC)
145
146     return 0;
147 }
148
149 // Free all allocated memory -----------------------------------------
150
151 static void vorbis_free(vorbis_context *vc) {
152     int_fast16_t i;
153
154     av_freep(&vc->channel_residues);
155     av_freep(&vc->channel_floors);
156     av_freep(&vc->saved);
157     av_freep(&vc->ret);
158     av_freep(&vc->buf);
159     av_freep(&vc->buf_tmp);
160
161     av_freep(&vc->residues);
162     av_freep(&vc->modes);
163
164     ff_mdct_end(&vc->mdct0);
165     ff_mdct_end(&vc->mdct1);
166
167     for(i=0;i<vc->codebook_count;++i) {
168         av_free(vc->codebooks[i].codevectors);
169         free_vlc(&vc->codebooks[i].vlc);
170     }
171     av_freep(&vc->codebooks);
172
173     for(i=0;i<vc->floor_count;++i) {
174         av_free(vc->floors[i].x_list);
175         av_free(vc->floors[i].x_list_order);
176         av_free(vc->floors[i].low_neighbour);
177         av_free(vc->floors[i].high_neighbour);
178     }
179     av_freep(&vc->floors);
180
181     for(i=0;i<vc->mapping_count;++i) {
182         av_free(vc->mappings[i].magnitude);
183         av_free(vc->mappings[i].angle);
184         av_free(vc->mappings[i].mux);
185     }
186     av_freep(&vc->mappings);
187 }
188
189 // Parse setup header -------------------------------------------------
190
191 // Process codebooks part
192
193 static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc) {
194     uint_fast16_t cb;
195     uint_fast8_t *tmp_vlc_bits;
196     uint_fast32_t *tmp_vlc_codes;
197     GetBitContext *gb=&vc->gb;
198
199     vc->codebook_count=get_bits(gb,8)+1;
200
201     AV_DEBUG(" Codebooks: %d \n", vc->codebook_count);
202
203     vc->codebooks=(vorbis_codebook *)av_mallocz(vc->codebook_count * sizeof(vorbis_codebook));
204     tmp_vlc_bits=(uint_fast8_t *)av_mallocz(V_MAX_VLCS * sizeof(uint_fast8_t));
205     tmp_vlc_codes=(uint_fast32_t *)av_mallocz(V_MAX_VLCS * sizeof(uint_fast32_t));
206
207     for(cb=0;cb<vc->codebook_count;++cb) {
208         vorbis_codebook *codebook_setup=&vc->codebooks[cb];
209         uint_fast8_t ordered;
210         uint_fast32_t t, used_entries=0;
211         uint_fast32_t entries;
212
213         AV_DEBUG(" %d. Codebook \n", cb);
214
215         if (get_bits(gb, 24)!=0x564342) {
216             av_log(vc->avccontext, AV_LOG_ERROR, " %d. Codebook setup data corrupt. \n", cb);
217             goto error;
218         }
219
220         codebook_setup->dimensions=get_bits(gb, 16);
221         if (codebook_setup->dimensions>16) {
222             av_log(vc->avccontext, AV_LOG_ERROR, " %d. Codebook's dimension is too large (%d). \n", cb, codebook_setup->dimensions);
223             goto error;
224         }
225         entries=get_bits(gb, 24);
226         if (entries>V_MAX_VLCS) {
227             av_log(vc->avccontext, AV_LOG_ERROR, " %d. Codebook has too many entries (%d). \n", cb, entries);
228             goto error;
229         }
230
231         ordered=get_bits1(gb);
232
233         AV_DEBUG(" codebook_dimensions %d, codebook_entries %d \n", codebook_setup->dimensions, entries);
234
235         if (!ordered) {
236             uint_fast16_t ce;
237             uint_fast8_t flag;
238             uint_fast8_t sparse=get_bits1(gb);
239
240             AV_DEBUG(" not ordered \n");
241
242             if (sparse) {
243                 AV_DEBUG(" sparse \n");
244
245                 used_entries=0;
246                 for(ce=0;ce<entries;++ce) {
247                     flag=get_bits1(gb);
248                     if (flag) {
249                         tmp_vlc_bits[ce]=get_bits(gb, 5)+1;
250                         ++used_entries;
251                     }
252                     else tmp_vlc_bits[ce]=0;
253                 }
254             } else {
255                 AV_DEBUG(" not sparse \n");
256
257                 used_entries=entries;
258                 for(ce=0;ce<entries;++ce) {
259                     tmp_vlc_bits[ce]=get_bits(gb, 5)+1;
260                 }
261             }
262         } else {
263             uint_fast16_t current_entry=0;
264             uint_fast8_t current_length=get_bits(gb, 5)+1;
265
266             AV_DEBUG(" ordered, current length: %d \n", current_length);  //FIXME
267
268             used_entries=entries;
269             for(;current_entry<used_entries;++current_length) {
270                 uint_fast16_t i, number;
271
272                 AV_DEBUG(" number bits: %d ", ilog(entries - current_entry));
273
274                 number=get_bits(gb, ilog(entries - current_entry));
275
276                 AV_DEBUG(" number: %d \n", number);
277
278                 for(i=current_entry;i<number+current_entry;++i) {
279                     if (i<used_entries) tmp_vlc_bits[i]=current_length;
280                 }
281
282                 current_entry+=number;
283             }
284             if (current_entry>used_entries) {
285                 av_log(vc->avccontext, AV_LOG_ERROR, " More codelengths than codes in codebook. \n");
286                 goto error;
287             }
288         }
289
290         codebook_setup->lookup_type=get_bits(gb, 4);
291
292         AV_DEBUG(" lookup type: %d : %s \n", codebook_setup->lookup_type, codebook_setup->lookup_type ? "vq" : "no lookup" );
293
294 // If the codebook is used for (inverse) VQ, calculate codevectors.
295
296         if (codebook_setup->lookup_type==1) {
297             uint_fast16_t i, j, k;
298             uint_fast16_t codebook_lookup_values=nth_root(entries, codebook_setup->dimensions);
299             uint_fast16_t codebook_multiplicands[codebook_lookup_values];
300
301             float codebook_minimum_value=vorbisfloat2float(get_bits_long_le(gb, 32));
302             float codebook_delta_value=vorbisfloat2float(get_bits_long_le(gb, 32));
303             uint_fast8_t codebook_value_bits=get_bits(gb, 4)+1;
304             uint_fast8_t codebook_sequence_p=get_bits1(gb);
305
306             AV_DEBUG(" We expect %d numbers for building the codevectors. \n", codebook_lookup_values);
307             AV_DEBUG("  delta %f minmum %f \n", codebook_delta_value, codebook_minimum_value);
308
309             for(i=0;i<codebook_lookup_values;++i) {
310                 codebook_multiplicands[i]=get_bits(gb, codebook_value_bits);
311
312                 AV_DEBUG(" multiplicands*delta+minmum : %e \n", (float)codebook_multiplicands[i]*codebook_delta_value+codebook_minimum_value);
313                 AV_DEBUG(" multiplicand %d \n", codebook_multiplicands[i]);
314             }
315
316 // Weed out unused vlcs and build codevector vector
317             codebook_setup->codevectors=(float *)av_mallocz(used_entries*codebook_setup->dimensions * sizeof(float));
318             for(j=0, i=0;i<entries;++i) {
319                 uint_fast8_t dim=codebook_setup->dimensions;
320
321                 if (tmp_vlc_bits[i]) {
322                     float last=0.0;
323                     uint_fast32_t lookup_offset=i;
324
325 #ifdef V_DEBUG
326                     av_log(vc->avccontext, AV_LOG_INFO, "Lookup offset %d ,", i);
327 #endif
328
329                     for(k=0;k<dim;++k) {
330                         uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values;
331                         codebook_setup->codevectors[j*dim+k]=codebook_multiplicands[multiplicand_offset]*codebook_delta_value+codebook_minimum_value+last;
332                         if (codebook_sequence_p) {
333                             last=codebook_setup->codevectors[j*dim+k];
334                         }
335                         lookup_offset/=codebook_lookup_values;
336                     }
337                     tmp_vlc_bits[j]=tmp_vlc_bits[i];
338
339 #ifdef V_DEBUG
340                     av_log(vc->avccontext, AV_LOG_INFO, "real lookup offset %d, vector: ", j);
341                     for(k=0;k<dim;++k) {
342                         av_log(vc->avccontext, AV_LOG_INFO, " %f ", codebook_setup->codevectors[j*dim+k]);
343                     }
344                     av_log(vc->avccontext, AV_LOG_INFO, "\n");
345 #endif
346
347                     ++j;
348                 }
349             }
350             if (j!=used_entries) {
351                 av_log(vc->avccontext, AV_LOG_ERROR, "Bug in codevector vector building code. \n");
352                 goto error;
353             }
354             entries=used_entries;
355         }
356         else if (codebook_setup->lookup_type>=2) {
357             av_log(vc->avccontext, AV_LOG_ERROR, "Codebook lookup type not supported. \n");
358             goto error;
359         }
360
361 // Initialize VLC table
362         if (vorbis_len2vlc(vc, tmp_vlc_bits, tmp_vlc_codes, entries)) {
363             av_log(vc->avccontext, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");
364             goto error;
365         }
366         codebook_setup->maxdepth=0;
367         for(t=0;t<entries;++t)
368             if (tmp_vlc_bits[t]>=codebook_setup->maxdepth) codebook_setup->maxdepth=tmp_vlc_bits[t];
369
370         codebook_setup->maxdepth=(codebook_setup->maxdepth+V_NB_BITS-1)/V_NB_BITS;
371
372         if (init_vlc(&codebook_setup->vlc, V_NB_BITS, entries, tmp_vlc_bits, sizeof(*tmp_vlc_bits), sizeof(*tmp_vlc_bits), tmp_vlc_codes, sizeof(*tmp_vlc_codes), sizeof(*tmp_vlc_codes), INIT_VLC_LE)) {
373             av_log(vc->avccontext, AV_LOG_ERROR, " Error generating vlc tables. \n");
374             goto error;
375         }
376     }
377
378     av_free(tmp_vlc_bits);
379     av_free(tmp_vlc_codes);
380     return 0;
381
382 // Error:
383 error:
384     av_free(tmp_vlc_bits);
385     av_free(tmp_vlc_codes);
386     return 1;
387 }
388
389 // Process time domain transforms part (unused in Vorbis I)
390
391 static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc) {
392     GetBitContext *gb=&vc->gb;
393     uint_fast8_t i;
394     uint_fast8_t vorbis_time_count=get_bits(gb, 6)+1;
395
396     for(i=0;i<vorbis_time_count;++i) {
397         uint_fast16_t vorbis_tdtransform=get_bits(gb, 16);
398
399         AV_DEBUG(" Vorbis time domain transform %d: %d \n", vorbis_time_count, vorbis_tdtransform);
400
401         if (vorbis_tdtransform) {
402             av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n");
403             return 1;
404         }
405     }
406     return 0;
407 }
408
409 // Process floors part - only floor type 1 is supported
410
411 static int vorbis_parse_setup_hdr_floors(vorbis_context *vc) {
412     GetBitContext *gb=&vc->gb;
413     uint_fast16_t i,j,k;
414
415     vc->floor_count=get_bits(gb, 6)+1;
416
417     vc->floors=(vorbis_floor *)av_mallocz(vc->floor_count * sizeof(vorbis_floor));
418
419     for (i=0;i<vc->floor_count;++i) {
420         vorbis_floor *floor_setup=&vc->floors[i];
421
422         floor_setup->floor_type=get_bits(gb, 16);
423
424         AV_DEBUG(" %d. floor type %d \n", i, floor_setup->floor_type);
425
426         if (floor_setup->floor_type==1) {
427             uint_fast8_t maximum_class=0;
428             uint_fast8_t rangebits;
429             uint_fast16_t floor1_values=2;
430
431             floor_setup->partitions=get_bits(gb, 5);
432
433             AV_DEBUG(" %d.floor: %d partitions \n", i, floor_setup->partitions);
434
435             for(j=0;j<floor_setup->partitions;++j) {
436                 floor_setup->partition_class[j]=get_bits(gb, 4);
437                 if (floor_setup->partition_class[j]>maximum_class) maximum_class=floor_setup->partition_class[j];
438
439                 AV_DEBUG(" %d. floor %d partition class %d \n", i, j, floor_setup->partition_class[j]);
440
441             }
442
443             AV_DEBUG(" maximum class %d \n", maximum_class);
444
445             floor_setup->maximum_class=maximum_class;
446
447             for(j=0;j<=maximum_class;++j) {
448                 floor_setup->class_dimensions[j]=get_bits(gb, 3)+1;
449                 floor_setup->class_subclasses[j]=get_bits(gb, 2);
450
451                 AV_DEBUG(" %d floor %d class dim: %d subclasses %d \n", i, j, floor_setup->class_dimensions[j], floor_setup->class_subclasses[j]);
452
453                 if (floor_setup->class_subclasses[j]) {
454                     floor_setup->class_masterbook[j]=get_bits(gb, 8);
455
456                     AV_DEBUG("   masterbook: %d \n", floor_setup->class_masterbook[j]);
457                 }
458
459                 for(k=0;k<(1<<floor_setup->class_subclasses[j]);++k) {
460                     floor_setup->subclass_books[j][k]=get_bits(gb, 8)-1;
461
462                     AV_DEBUG("    book %d. : %d \n", k, floor_setup->subclass_books[j][k]);
463                 }
464             }
465
466             floor_setup->multiplier=get_bits(gb, 2)+1;
467             floor_setup->x_list_dim=2;
468
469             for(j=0;j<floor_setup->partitions;++j) {
470                 floor_setup->x_list_dim+=floor_setup->class_dimensions[floor_setup->partition_class[j]];
471             }
472
473             floor_setup->x_list=(uint_fast16_t *)av_mallocz(floor_setup->x_list_dim * sizeof(uint_fast16_t));
474             floor_setup->x_list_order=(uint_fast16_t *)av_mallocz(floor_setup->x_list_dim * sizeof(uint_fast16_t));
475             floor_setup->low_neighbour=(uint_fast16_t *)av_mallocz(floor_setup->x_list_dim * sizeof(uint_fast16_t));
476             floor_setup->high_neighbour=(uint_fast16_t *)av_mallocz(floor_setup->x_list_dim * sizeof(uint_fast16_t));
477
478
479             rangebits=get_bits(gb, 4);
480             floor_setup->x_list[0] = 0;
481             floor_setup->x_list[1] = (1<<rangebits);
482
483             for(j=0;j<floor_setup->partitions;++j) {
484                 for(k=0;k<floor_setup->class_dimensions[floor_setup->partition_class[j]];++k,++floor1_values) {
485                     floor_setup->x_list[floor1_values]=get_bits(gb, rangebits);
486
487                     AV_DEBUG(" %d. floor1 Y coord. %d \n", floor1_values, floor_setup->x_list[floor1_values]);
488                 }
489             }
490
491 // Precalculate order of x coordinates - needed for decode
492
493             for(k=0;k<floor_setup->x_list_dim;++k) {
494                 floor_setup->x_list_order[k]=k;
495             }
496
497             for(k=0;k<floor_setup->x_list_dim-1;++k) {   // FIXME optimize sorting ?
498                 for(j=k+1;j<floor_setup->x_list_dim;++j) {
499                     if(floor_setup->x_list[floor_setup->x_list_order[k]]>floor_setup->x_list[floor_setup->x_list_order[j]]) {
500                         uint_fast16_t tmp=floor_setup->x_list_order[k];
501                         floor_setup->x_list_order[k]=floor_setup->x_list_order[j];
502                         floor_setup->x_list_order[j]=tmp;
503                     }
504                 }
505             }
506
507 // Precalculate low and high neighbours
508
509             for(k=2;k<floor_setup->x_list_dim;++k) {
510                 floor_setup->low_neighbour[k]=0;
511                 floor_setup->high_neighbour[k]=1;  // correct according to SPEC requirements
512
513                 for (j=0;j<k;++j) {
514                     if ((floor_setup->x_list[j]<floor_setup->x_list[k]) &&
515                       (floor_setup->x_list[j]>floor_setup->x_list[floor_setup->low_neighbour[k]])) {
516                         floor_setup->low_neighbour[k]=j;
517                     }
518                     if ((floor_setup->x_list[j]>floor_setup->x_list[k]) &&
519                       (floor_setup->x_list[j]<floor_setup->x_list[floor_setup->high_neighbour[k]])) {
520                         floor_setup->high_neighbour[k]=j;
521                     }
522                 }
523             }
524         }
525         else {
526             av_log(vc->avccontext, AV_LOG_ERROR, "Only floor type 1 supported. \n");
527             return 1;
528         }
529     }
530     return 0;
531 }
532
533 // Process residues part
534
535 static int vorbis_parse_setup_hdr_residues(vorbis_context *vc){
536     GetBitContext *gb=&vc->gb;
537     uint_fast8_t i, j, k;
538
539     vc->residue_count=get_bits(gb, 6)+1;
540     vc->residues=(vorbis_residue *)av_mallocz(vc->residue_count * sizeof(vorbis_residue));
541
542     AV_DEBUG(" There are %d residues. \n", vc->residue_count);
543
544     for(i=0;i<vc->residue_count;++i) {
545         vorbis_residue *res_setup=&vc->residues[i];
546         uint_fast8_t cascade[64];
547         uint_fast8_t high_bits;
548         uint_fast8_t low_bits;
549
550         res_setup->type=get_bits(gb, 16);
551
552         AV_DEBUG(" %d. residue type %d \n", i, res_setup->type);
553
554         res_setup->begin=get_bits(gb, 24);
555         res_setup->end=get_bits(gb, 24);
556         res_setup->partition_size=get_bits(gb, 24)+1;
557         res_setup->classifications=get_bits(gb, 6)+1;
558         res_setup->classbook=get_bits(gb, 8);
559
560         AV_DEBUG("    begin %d end %d part.size %d classif.s %d classbook %d \n", res_setup->begin, res_setup->end, res_setup->partition_size,
561           res_setup->classifications, res_setup->classbook);
562
563         for(j=0;j<res_setup->classifications;++j) {
564             high_bits=0;
565             low_bits=get_bits(gb, 3);
566             if (get_bits1(gb)) {
567                 high_bits=get_bits(gb, 5);
568             }
569             cascade[j]=(high_bits<<3)+low_bits;
570
571             AV_DEBUG("     %d class casscade depth: %d \n", j, ilog(cascade[j]));
572         }
573
574         res_setup->maxpass=0;
575         for(j=0;j<res_setup->classifications;++j) {
576             for(k=0;k<8;++k) {
577                 if (cascade[j]&(1<<k)) {
578                         res_setup->books[j][k]=get_bits(gb, 8);
579
580                     AV_DEBUG("     %d class casscade depth %d book: %d \n", j, k, res_setup->books[j][k]);
581
582                     if (k>res_setup->maxpass) {
583                         res_setup->maxpass=k;
584                     }
585                 } else {
586                     res_setup->books[j][k]=-1;
587                 }
588             }
589         }
590     }
591     return 0;
592 }
593
594 // Process mappings part
595
596 static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc) {
597     GetBitContext *gb=&vc->gb;
598     uint_fast8_t i, j;
599
600     vc->mapping_count=get_bits(gb, 6)+1;
601     vc->mappings=(vorbis_mapping *)av_mallocz(vc->mapping_count * sizeof(vorbis_mapping));
602
603     AV_DEBUG(" There are %d mappings. \n", vc->mapping_count);
604
605     for(i=0;i<vc->mapping_count;++i) {
606         vorbis_mapping *mapping_setup=&vc->mappings[i];
607
608         if (get_bits(gb, 16)) {
609             av_log(vc->avccontext, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n");
610             return 1;
611         }
612         if (get_bits1(gb)) {
613             mapping_setup->submaps=get_bits(gb, 4)+1;
614         } else {
615             mapping_setup->submaps=1;
616         }
617
618         if (get_bits1(gb)) {
619             mapping_setup->coupling_steps=get_bits(gb, 8)+1;
620             mapping_setup->magnitude=(uint_fast8_t *)av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
621             mapping_setup->angle=(uint_fast8_t *)av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
622             for(j=0;j<mapping_setup->coupling_steps;++j) {
623                 mapping_setup->magnitude[j]=get_bits(gb, ilog(vc->audio_channels-1));
624                 mapping_setup->angle[j]=get_bits(gb, ilog(vc->audio_channels-1));
625                 // FIXME: sanity checks
626             }
627         } else {
628             mapping_setup->coupling_steps=0;
629         }
630
631         AV_DEBUG("   %d mapping coupling steps: %d \n", i, mapping_setup->coupling_steps);
632
633         if(get_bits(gb, 2)) {
634             av_log(vc->avccontext, AV_LOG_ERROR, "%d. mapping setup data invalid. \n", i);
635             return 1; // following spec.
636         }
637
638         if (mapping_setup->submaps>1) {
639             mapping_setup->mux=(uint_fast8_t *)av_mallocz(vc->audio_channels * sizeof(uint_fast8_t));
640             for(j=0;j<vc->audio_channels;++j) {
641                 mapping_setup->mux[j]=get_bits(gb, 4);
642             }
643         }
644
645         for(j=0;j<mapping_setup->submaps;++j) {
646             get_bits(gb, 8); // FIXME check?
647             mapping_setup->submap_floor[j]=get_bits(gb, 8);
648             mapping_setup->submap_residue[j]=get_bits(gb, 8);
649
650             AV_DEBUG("   %d mapping %d submap : floor %d, residue %d \n", i, j, mapping_setup->submap_floor[j], mapping_setup->submap_residue[j]);
651         }
652     }
653     return 0;
654 }
655
656 // Process modes part
657
658 static int vorbis_parse_setup_hdr_modes(vorbis_context *vc) {
659     GetBitContext *gb=&vc->gb;
660     uint_fast8_t i;
661
662     vc->mode_count=get_bits(gb, 6)+1;
663     vc->modes=(vorbis_mode *)av_mallocz(vc->mode_count * sizeof(vorbis_mode));
664
665     AV_DEBUG(" There are %d modes.\n", vc->mode_count);
666
667     for(i=0;i<vc->mode_count;++i) {
668         vorbis_mode *mode_setup=&vc->modes[i];
669
670         mode_setup->blockflag=get_bits(gb, 1);
671         mode_setup->windowtype=get_bits(gb, 16); //FIXME check
672         mode_setup->transformtype=get_bits(gb, 16); //FIXME check
673         mode_setup->mapping=get_bits(gb, 8); //FIXME check
674
675         AV_DEBUG(" %d mode: blockflag %d, windowtype %d, transformtype %d, mapping %d \n", i, mode_setup->blockflag, mode_setup->windowtype, mode_setup->transformtype, mode_setup->mapping);
676     }
677     return 0;
678 }
679
680 // Process the whole setup header using the functions above
681
682 static int vorbis_parse_setup_hdr(vorbis_context *vc) {
683     GetBitContext *gb=&vc->gb;
684
685     if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') ||
686     (get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') ||
687     (get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) {
688         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n");
689         return 1;
690     }
691
692     if (vorbis_parse_setup_hdr_codebooks(vc)) {
693         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n");
694         return 2;
695     }
696     if (vorbis_parse_setup_hdr_tdtransforms(vc)) {
697         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n");
698         return 3;
699     }
700     if (vorbis_parse_setup_hdr_floors(vc)) {
701         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n");
702         return 4;
703     }
704     if (vorbis_parse_setup_hdr_residues(vc)) {
705         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n");
706         return 5;
707     }
708     if (vorbis_parse_setup_hdr_mappings(vc)) {
709         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n");
710         return 6;
711     }
712     if (vorbis_parse_setup_hdr_modes(vc)) {
713         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n");
714         return 7;
715     }
716     if (!get_bits1(gb)) {
717         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n");
718         return 8; // framing flag bit unset error
719     }
720
721     return 0;
722 }
723
724 // Process the identification header
725
726 static int vorbis_parse_id_hdr(vorbis_context *vc){
727     GetBitContext *gb=&vc->gb;
728     uint_fast8_t bl0, bl1;
729     const float *vwin[8]={ vwin64, vwin128, vwin256, vwin512, vwin1024, vwin2048, vwin4096, vwin8192 };
730
731     if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') ||
732     (get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') ||
733     (get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) {
734         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n");
735         return 1;
736     }
737
738     vc->version=get_bits_long_le(gb, 32);    //FIXME check 0
739     vc->audio_channels=get_bits(gb, 8);   //FIXME check >0
740     vc->audio_samplerate=get_bits_long_le(gb, 32);   //FIXME check >0
741     vc->bitrate_maximum=get_bits_long_le(gb, 32);
742     vc->bitrate_nominal=get_bits_long_le(gb, 32);
743     vc->bitrate_minimum=get_bits_long_le(gb, 32);
744     bl0=get_bits(gb, 4);
745     bl1=get_bits(gb, 4);
746     vc->blocksize_0=(1<<bl0);
747     vc->blocksize_1=(1<<bl1);
748     if (bl0>13 || bl0<6 || bl1>13 || bl1<6) {
749         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n");
750         return 3;
751     }
752     vc->swin=vwin[bl0-6];
753     vc->lwin=vwin[bl1-6];
754
755     if ((get_bits1(gb)) == 0) {
756         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n");
757         return 2;
758     }
759
760     vc->channel_residues=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
761     vc->channel_floors=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
762     vc->saved=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
763     vc->ret=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
764     vc->buf=(float *)av_malloc(vc->blocksize_1 * sizeof(float));
765     vc->buf_tmp=(float *)av_malloc(vc->blocksize_1 * sizeof(float));
766     vc->saved_start=0;
767
768     ff_mdct_init(&vc->mdct0, bl0, 1);
769     ff_mdct_init(&vc->mdct1, bl1, 1);
770
771     AV_DEBUG(" vorbis version %d \n audio_channels %d \n audio_samplerate %d \n bitrate_max %d \n bitrate_nom %d \n bitrate_min %d \n blk_0 %d blk_1 %d \n ",
772             vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize_0, vc->blocksize_1);
773
774 /*
775     BLK=vc->blocksize_0;
776     for(i=0;i<BLK/2;++i) {
777         vc->swin[i]=sin(0.5*3.14159265358*(sin(((float)i+0.5)/(float)BLK*3.14159265358))*(sin(((float)i+0.5)/(float)BLK*3.14159265358)));
778     }
779 */
780
781     return 0;
782 }
783
784 // Process the extradata using the functions above (identification header, setup header)
785
786 static int vorbis_decode_init(AVCodecContext *avccontext) {
787     vorbis_context *vc = avccontext->priv_data ;
788     uint8_t *headers = avccontext->extradata;
789     int headers_len=avccontext->extradata_size;
790     uint8_t *header_start[3];
791     int header_len[3];
792     GetBitContext *gb = &(vc->gb);
793     int i, j, hdr_type;
794
795     vc->avccontext = avccontext;
796
797     if (!headers_len) {
798         av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
799         return -1;
800     }
801
802     if(headers[0] == 0 && headers[1] == 30) {
803         for(i = 0; i < 3; i++){
804             header_len[i] = *headers++ << 8;
805             header_len[i] += *headers++;
806             header_start[i] = headers;
807             headers += header_len[i];
808         }
809     } else if(headers[0] == 2) {
810         for(j=1,i=0;i<2;++i, ++j) {
811             header_len[i]=0;
812             while(j<headers_len && headers[j]==0xff) {
813                 header_len[i]+=0xff;
814                 ++j;
815             }
816             if (j>=headers_len) {
817                 av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
818                 return -1;
819             }
820             header_len[i]+=headers[j];
821         }
822         header_len[2]=headers_len-header_len[0]-header_len[1]-j;
823         headers+=j;
824         header_start[0] = headers;
825         header_start[1] = header_start[0] + header_len[0];
826         header_start[2] = header_start[1] + header_len[1];
827     } else {
828         av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
829         return -1;
830     }
831
832     init_get_bits(gb, header_start[0], header_len[0]*8);
833     hdr_type=get_bits(gb, 8);
834     if (hdr_type!=1) {
835         av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n");
836         return -1;
837     }
838     if (vorbis_parse_id_hdr(vc)) {
839         av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n");
840         vorbis_free(vc);
841         return -1;
842     }
843
844     init_get_bits(gb, header_start[2], header_len[2]*8);
845     hdr_type=get_bits(gb, 8);
846     if (hdr_type!=5) {
847         av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");
848         return -1;
849     }
850     if (vorbis_parse_setup_hdr(vc)) {
851         av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");
852         vorbis_free(vc);
853         return -1;
854     }
855
856     avccontext->channels = vc->audio_channels;
857     avccontext->sample_rate = vc->audio_samplerate;
858
859     return 0 ;
860 }
861
862 // Decode audiopackets -------------------------------------------------
863
864 // Read and decode floor (type 1 only)
865
866 static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc, vorbis_floor *vf, float *vec) {
867     GetBitContext *gb=&vc->gb;
868     uint_fast16_t range_v[4]={ 256, 128, 86, 64 };
869     uint_fast16_t range=range_v[vf->multiplier-1];
870     uint_fast16_t floor1_Y[vf->x_list_dim];
871     uint_fast16_t floor1_Y_final[vf->x_list_dim];
872     uint_fast8_t floor1_flag[vf->x_list_dim];
873     uint_fast8_t class_;
874     uint_fast8_t cdim;
875     uint_fast8_t cbits;
876     uint_fast8_t csub;
877     uint_fast8_t cval;
878     int_fast16_t book;
879     uint_fast16_t offset;
880     uint_fast16_t i,j;
881     uint_fast16_t *floor_x_sort=vf->x_list_order;
882     /*u*/int_fast16_t adx, ady, off, predicted; // WTF ? dy/adx= (unsigned)dy/adx ?
883     int_fast16_t dy, err;
884     uint_fast16_t lx,hx, ly, hy=0;
885
886
887     if (!get_bits1(gb)) return 1; // silence
888
889 // Read values (or differences) for the floor's points
890
891     floor1_Y[0]=get_bits(gb, ilog(range-1));
892     floor1_Y[1]=get_bits(gb, ilog(range-1));
893
894     AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);
895
896     offset=2;
897     for(i=0;i<vf->partitions;++i) {
898         class_=vf->partition_class[i];
899         cdim=vf->class_dimensions[class_];
900         cbits=vf->class_subclasses[class_];
901         csub=(1<<cbits)-1;
902         cval=0;
903
904         AV_DEBUG("Cbits %d \n", cbits);
905
906         if (cbits) { // this reads all subclasses for this partition's class
907             cval=get_vlc2(gb, vc->codebooks[vf->class_masterbook[class_]].vlc.table,
908             V_NB_BITS, vc->codebooks[vf->class_masterbook[class_]].maxdepth);
909         }
910
911         for(j=0;j<cdim;++j) {
912             book=vf->subclass_books[class_][cval & csub];
913
914             AV_DEBUG("book %d Cbits %d cval %d  bits:%d \n", book, cbits, cval, get_bits_count(gb));
915
916             cval=cval>>cbits;
917             if (book>0) {
918                 floor1_Y[offset+j]=get_vlc2(gb, vc->codebooks[book].vlc.table,
919                 V_NB_BITS, vc->codebooks[book].maxdepth);
920             } else {
921                 floor1_Y[offset+j]=0;
922             }
923
924             AV_DEBUG(" floor(%d) = %d \n", vf->x_list[offset+j], floor1_Y[offset+j]);
925         }
926         offset+=cdim;
927     }
928
929 // Amplitude calculation from the differences
930
931     floor1_flag[0]=1;
932     floor1_flag[1]=1;
933     floor1_Y_final[0]=floor1_Y[0];
934     floor1_Y_final[1]=floor1_Y[1];
935
936     for(i=2;i<vf->x_list_dim;++i) {
937         uint_fast16_t val, highroom, lowroom, room;
938         uint_fast16_t high_neigh_offs;
939         uint_fast16_t low_neigh_offs;
940
941         low_neigh_offs=vf->low_neighbour[i];
942         high_neigh_offs=vf->high_neighbour[i];
943         dy=floor1_Y_final[high_neigh_offs]-floor1_Y_final[low_neigh_offs];  // render_point begin
944         adx=vf->x_list[high_neigh_offs]-vf->x_list[low_neigh_offs];
945         ady= ABS(dy);
946         err=ady*(vf->x_list[i]-vf->x_list[low_neigh_offs]);
947         off=err/adx;
948         if (dy<0) {
949             predicted=floor1_Y_final[low_neigh_offs]-off;
950         } else {
951             predicted=floor1_Y_final[low_neigh_offs]+off;
952         } // render_point end
953
954         val=floor1_Y[i];
955         highroom=range-predicted;
956         lowroom=predicted;
957         if (highroom < lowroom) {
958             room=highroom*2;
959         } else {
960             room=lowroom*2;   // SPEC mispelling
961         }
962         if (val) {
963             floor1_flag[low_neigh_offs]=1;
964             floor1_flag[high_neigh_offs]=1;
965             floor1_flag[i]=1;
966             if (val>=room) {
967                 if (highroom > lowroom) {
968                     floor1_Y_final[i]=val-lowroom+predicted;
969                 } else {
970                     floor1_Y_final[i]=predicted-val+highroom-1;
971                 }
972             } else {
973                 if (val & 1) {
974                     floor1_Y_final[i]=predicted-(val+1)/2;
975                 } else {
976                     floor1_Y_final[i]=predicted+val/2;
977                 }
978             }
979         } else {
980             floor1_flag[i]=0;
981             floor1_Y_final[i]=predicted;
982         }
983
984         AV_DEBUG(" Decoded floor(%d) = %d / val %d \n", vf->x_list[i], floor1_Y_final[i], val);
985     }
986
987 // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?
988
989     hx=0;
990     lx=0;
991     ly=floor1_Y_final[0]*vf->multiplier;  // conforms to SPEC
992
993     vec[0]=floor1_inverse_db_table[ly];
994
995     for(i=1;i<vf->x_list_dim;++i) {
996         AV_DEBUG(" Looking at post %d \n", i);
997
998         if (floor1_flag[floor_x_sort[i]]) {   // SPEC mispelled
999             int_fast16_t x, y, dy, base, sy; // if uncommented: dy = -32 adx = 2  base = 2blablabla ?????
1000
1001             hy=floor1_Y_final[floor_x_sort[i]]*vf->multiplier;
1002             hx=vf->x_list[floor_x_sort[i]];
1003
1004             dy=hy-ly;
1005             adx=hx-lx;
1006             ady= (dy<0) ? -dy:dy;//ABS(dy);
1007             base=dy/adx;
1008
1009             AV_DEBUG(" dy %d  adx %d base %d = %d \n", dy, adx, base, dy/adx);
1010
1011             x=lx;
1012             y=ly;
1013             err=0;
1014             if (dy<0) {
1015                 sy=base-1;
1016             } else {
1017                 sy=base+1;
1018             }
1019             ady=ady-(base<0 ? -base : base)*adx;
1020             vec[x]=floor1_inverse_db_table[y];
1021
1022             AV_DEBUG(" vec[ %d ] = %d \n", x, y);
1023
1024             for(x=lx+1;(x<hx) && (x<vf->x_list[1]);++x) {
1025                 err+=ady;
1026                 if (err>=adx) {
1027                     err-=adx;
1028                     y+=sy;
1029                 } else {
1030                     y+=base;
1031                 }
1032                 vec[x]=floor1_inverse_db_table[y];
1033
1034                 AV_DEBUG(" vec[ %d ] = %d \n", x, y);
1035             }
1036
1037 /*            for(j=1;j<hx-lx+1;++j) {  // iterating render_point
1038                 dy=hy-ly;
1039                 adx=hx-lx;
1040                 ady= dy<0 ? -dy : dy;
1041                 err=ady*j;
1042                 off=err/adx;
1043                 if (dy<0) {
1044                     predicted=ly-off;
1045                 } else {
1046                     predicted=ly+off;
1047                 }
1048                 if (lx+j < vf->x_list[1]) {
1049                     vec[lx+j]=floor1_inverse_db_table[predicted];
1050                 }
1051             }*/
1052
1053             lx=hx;
1054             ly=hy;
1055         }
1056     }
1057
1058     if (hx<vf->x_list[1]) {
1059         for(i=hx;i<vf->x_list[1];++i) {
1060             vec[i]=floor1_inverse_db_table[hy];
1061         }
1062     }
1063
1064     AV_DEBUG(" Floor decoded\n");
1065
1066     return 0;
1067 }
1068
1069 // Read and decode residue
1070
1071 static int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr, uint_fast8_t ch, uint_fast8_t *do_not_decode, float *vec, uint_fast16_t vlen) {
1072     GetBitContext *gb=&vc->gb;
1073     uint_fast8_t c_p_c=vc->codebooks[vr->classbook].dimensions;
1074     uint_fast16_t n_to_read=vr->end-vr->begin;
1075     uint_fast16_t ptns_to_read=n_to_read/vr->partition_size;
1076     uint_fast8_t classifs[ptns_to_read*vc->audio_channels];
1077     uint_fast8_t pass;
1078     uint_fast8_t ch_used;
1079     uint_fast8_t i,j,l;
1080     uint_fast16_t k;
1081
1082     if (vr->type==2) {
1083         for(j=1;j<ch;++j) {
1084                 do_not_decode[0]&=do_not_decode[j];  // FIXME - clobbering input
1085         }
1086         if (do_not_decode[0]) return 0;
1087         ch_used=1;
1088     } else {
1089         ch_used=ch;
1090     }
1091
1092     AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);
1093
1094     for(pass=0;pass<=vr->maxpass;++pass) { // FIXME OPTIMIZE?
1095         uint_fast16_t voffset;
1096         uint_fast16_t partition_count;
1097         uint_fast16_t j_times_ptns_to_read;
1098
1099         voffset=vr->begin;
1100         for(partition_count=0;partition_count<ptns_to_read;) {  // SPEC        error
1101             if (!pass) {
1102                 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {
1103                     if (!do_not_decode[j]) {
1104                         uint_fast32_t temp=get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,
1105                         V_NB_BITS, vc->codebooks[vr->classbook].maxdepth);
1106
1107                         AV_DEBUG("Classword: %d \n", temp);
1108
1109                         for(i=0;i<c_p_c;++i) {
1110                             uint_fast32_t temp2;
1111
1112                             temp2=temp/vr->classifications;
1113                             classifs[j_times_ptns_to_read+partition_count+c_p_c-1-i]=temp-temp2*vr->classifications;
1114                             temp=temp2;
1115                         }
1116                     }
1117                     j_times_ptns_to_read+=ptns_to_read;
1118                 }
1119             }
1120             for(i=0;(i<c_p_c) && (partition_count<ptns_to_read);++i) {
1121                 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {
1122                     uint_fast16_t voffs;
1123
1124                     if (!do_not_decode[j]) {
1125                         uint_fast8_t vqclass=classifs[j_times_ptns_to_read+partition_count];
1126                         int_fast16_t vqbook=vr->books[vqclass][pass];
1127
1128                         if (vqbook>=0) {
1129                             uint_fast16_t coffs;
1130
1131                             if (vr->type==0) {
1132                                 uint_fast16_t step=vr->partition_size/vc->codebooks[vqbook].dimensions;
1133
1134                                 voffs=voffset+j*vlen;
1135                                 for(k=0;k<step;++k) {
1136                                     coffs=get_vlc2(gb, vc->codebooks[vqbook].vlc.table,
1137                                     V_NB_BITS, vc->codebooks[vr->classbook].maxdepth) * vc->codebooks[vqbook].dimensions;
1138                                     for(l=0;l<vc->codebooks[vqbook].dimensions;++l) {
1139                                         vec[voffs+k+l*step]+=vc->codebooks[vqbook].codevectors[coffs+l];  // FPMATH
1140                                     }
1141                                 }
1142                             }
1143                             else if (vr->type==1) {
1144                                 voffs=voffset+j*vlen;
1145                                 for(k=0;k<vr->partition_size/vc->codebooks[vqbook].dimensions;++k) {
1146                                     coffs=get_vlc2(gb, vc->codebooks[vqbook].vlc.table,
1147                                     V_NB_BITS, vc->codebooks[vr->classbook].maxdepth) * vc->codebooks[vqbook].dimensions;
1148                                     for(l=0;l<vc->codebooks[vqbook].dimensions;++l, ++voffs) {
1149                                         vec[voffs]+=vc->codebooks[vqbook].codevectors[coffs+l];  // FPMATH
1150
1151                                         AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d  \n", pass, voffs, vec[voffs], vc->codebooks[vqbook].codevectors[coffs+l], coffs);
1152                                     }
1153                                 }
1154                             }
1155                             else if (vr->type==2 && ch==2) { // most frequent case optimized
1156                                 voffs=voffset;
1157
1158                                 for(k=0;k<vr->partition_size/vc->codebooks[vqbook].dimensions;++k) {
1159                                     coffs=get_vlc2(gb, vc->codebooks[vqbook].vlc.table,
1160                                     V_NB_BITS, vc->codebooks[vr->classbook].maxdepth) * vc->codebooks[vqbook].dimensions;
1161                                     for(l=0;l<vc->codebooks[vqbook].dimensions;++l, ++voffs) {
1162                                         vec[(voffs>>1)+((voffs&1) ? vlen : 0)]+=vc->codebooks[vqbook].codevectors[coffs+l];  // FPMATH
1163
1164                                         AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d+%d  \n", pass, voffset/ch+(voffs%ch)*vlen, vec[voffset/ch+(voffs%ch)*vlen], vc->codebooks[vqbook].codevectors[coffs+l], coffs, l);
1165                                     }
1166                                 }
1167
1168                             }
1169                             else if (vr->type==2) {
1170                                 voffs=voffset;
1171
1172                                 for(k=0;k<vr->partition_size/vc->codebooks[vqbook].dimensions;++k) {
1173                                     coffs=get_vlc2(gb, vc->codebooks[vqbook].vlc.table,
1174                                     V_NB_BITS, vc->codebooks[vr->classbook].maxdepth) * vc->codebooks[vqbook].dimensions;
1175                                     for(l=0;l<vc->codebooks[vqbook].dimensions;++l, ++voffs) {
1176                                         vec[voffs/ch+(voffs%ch)*vlen]+=vc->codebooks[vqbook].codevectors[coffs+l];  // FPMATH FIXME use if and counter instead of / and %
1177
1178                                         AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d+%d  \n", pass, voffset/ch+(voffs%ch)*vlen, vec[voffset/ch+(voffs%ch)*vlen], vc->codebooks[vqbook].codevectors[coffs+l], coffs, l);
1179                                     }
1180                                 }
1181                             } else {
1182                                 av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");
1183                                 return 1;
1184                             }
1185                         }
1186                     }
1187                     j_times_ptns_to_read+=ptns_to_read;
1188                 }
1189                 ++partition_count;
1190                 voffset+=vr->partition_size;
1191             }
1192         }
1193     }
1194     return 0;
1195 }
1196
1197 // Decode the audio packet using the functions above
1198
1199 static int vorbis_parse_audio_packet(vorbis_context *vc) {
1200     GetBitContext *gb=&vc->gb;
1201
1202     uint_fast8_t previous_window=0,next_window=0;
1203     uint_fast8_t mode_number;
1204     uint_fast16_t blocksize;
1205     int_fast32_t i,j;
1206     uint_fast8_t no_residue[vc->audio_channels];
1207     uint_fast8_t do_not_decode[vc->audio_channels];
1208     vorbis_mapping *mapping;
1209     float *ch_res_ptr=vc->channel_residues;
1210     float *ch_floor_ptr=vc->channel_floors;
1211     uint_fast8_t res_chan[vc->audio_channels];
1212     uint_fast8_t res_num=0;
1213     int_fast16_t retlen=0;
1214     uint_fast16_t saved_start=0;
1215
1216     if (get_bits1(gb)) {
1217         av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");
1218         return -1; // packet type not audio
1219     }
1220
1221     if (vc->mode_count==1) {
1222         mode_number=0;
1223     } else {
1224         mode_number=get_bits(gb, ilog(vc->mode_count-1));
1225     }
1226     mapping=&vc->mappings[vc->modes[mode_number].mapping];
1227
1228     AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);
1229
1230     if (vc->modes[mode_number].blockflag) {
1231         previous_window=get_bits1(gb);
1232         next_window=get_bits1(gb);
1233     }
1234
1235     blocksize=vc->modes[mode_number].blockflag ? vc->blocksize_1 : vc->blocksize_0;
1236     memset(ch_res_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?
1237     memset(ch_floor_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?
1238
1239 // Decode floor(1)
1240
1241     for(i=0;i<vc->audio_channels;++i) {
1242         vorbis_floor *floor;
1243         if (mapping->submaps>1) {
1244             floor=&vc->floors[mapping->submap_floor[mapping->mux[i]]];
1245         } else {
1246             floor=&vc->floors[mapping->submap_floor[0]];
1247         }
1248
1249         no_residue[i]=vorbis_floor1_decode(vc, floor, ch_floor_ptr);
1250         ch_floor_ptr+=blocksize/2;
1251     }
1252
1253 // Nonzero vector propagate
1254
1255     for(i=mapping->coupling_steps-1;i>=0;--i) {
1256         if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {
1257             no_residue[mapping->magnitude[i]]=0;
1258             no_residue[mapping->angle[i]]=0;
1259         }
1260     }
1261
1262 // Decode residue
1263
1264     for(i=0;i<mapping->submaps;++i) {
1265         vorbis_residue *residue;
1266         uint_fast8_t ch=0;
1267
1268         for(j=0;j<vc->audio_channels;++j) {
1269             if ((mapping->submaps==1) || (i=mapping->mux[j])) {
1270                 res_chan[j]=res_num;
1271                 if (no_residue[j]) {
1272                     do_not_decode[ch]=1;
1273                 } else {
1274                     do_not_decode[ch]=0;
1275                 }
1276                 ++ch;
1277                 ++res_num;
1278             }
1279         }
1280         residue=&vc->residues[mapping->submap_residue[i]];
1281         vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);
1282
1283         ch_res_ptr+=ch*blocksize/2;
1284     }
1285
1286 // Inverse coupling
1287
1288     for(i=mapping->coupling_steps-1;i>=0;--i) { //warning: i has to be signed
1289         float *mag, *ang;
1290
1291         mag=vc->channel_residues+res_chan[mapping->magnitude[i]]*blocksize/2;
1292         ang=vc->channel_residues+res_chan[mapping->angle[i]]*blocksize/2;
1293         for(j=0;j<blocksize/2;++j) {
1294             float temp;
1295             if (mag[j]>0.0) {
1296                 if (ang[j]>0.0) {
1297                     ang[j]=mag[j]-ang[j];
1298                 } else {
1299                     temp=ang[j];
1300                     ang[j]=mag[j];
1301                     mag[j]+=temp;
1302                 }
1303             } else {
1304                 if (ang[j]>0.0) {
1305                     ang[j]+=mag[j];
1306                 } else {
1307                     temp=ang[j];
1308                     ang[j]=mag[j];
1309                     mag[j]-=temp;
1310                 }
1311             }
1312         }
1313     }
1314
1315 // Dotproduct
1316
1317     for(j=0, ch_floor_ptr=vc->channel_floors;j<vc->audio_channels;++j,ch_floor_ptr+=blocksize/2) {
1318         ch_res_ptr=vc->channel_residues+res_chan[j]*blocksize/2;
1319
1320         for(i=0;i<blocksize/2;++i) {
1321             ch_floor_ptr[i]*=ch_res_ptr[i]; //FPMATH
1322         }
1323     }
1324
1325 // MDCT, overlap/add, save data for next overlapping  FPMATH
1326
1327     for(j=0;j<vc->audio_channels;++j) {
1328         uint_fast8_t step=vc->audio_channels;
1329         uint_fast16_t k;
1330         float *saved=vc->saved+j*vc->blocksize_1/2;
1331         float *ret=vc->ret;
1332         const float *lwin=vc->lwin;
1333         const float *swin=vc->swin;
1334         float *buf=vc->buf;
1335         float *buf_tmp=vc->buf_tmp;
1336
1337         ch_floor_ptr=vc->channel_floors+j*blocksize/2;
1338
1339         saved_start=vc->saved_start;
1340
1341         ff_imdct_calc(vc->modes[mode_number].blockflag ? &vc->mdct1 : &vc->mdct0, buf, ch_floor_ptr, buf_tmp);
1342
1343         if (vc->modes[mode_number].blockflag) {
1344             // -- overlap/add
1345             if (previous_window) {
1346                 for(k=j, i=0;i<vc->blocksize_1/2;++i, k+=step) {
1347                     ret[k]=saved[i]+buf[i]*lwin[i];
1348                 }
1349                 retlen=vc->blocksize_1/2;
1350             } else {
1351                 for(k=j, i=0;i<vc->blocksize_0/2;++i, k+=step) {
1352                     ret[k]=saved[i]+buf[(vc->blocksize_1-vc->blocksize_0)/4+i]*swin[i];
1353                 }
1354                 for(i=0;i<(vc->blocksize_1-vc->blocksize_0)/4;++i, k+=step) {
1355                     ret[k]=buf[vc->blocksize_0/2+(vc->blocksize_1-vc->blocksize_0)/4+i];
1356                 }
1357                 retlen=vc->blocksize_0/2+(vc->blocksize_1-vc->blocksize_0)/4;
1358             }
1359             // -- save
1360             if (next_window) {
1361                 for(i=0;i<vc->blocksize_1/2;++i) {
1362                     saved[i]=buf[vc->blocksize_1/2+i]*lwin[vc->blocksize_1/2-1-i];
1363                 }
1364                 saved_start=0;
1365             } else {
1366                 saved_start=(vc->blocksize_1-vc->blocksize_0)/4;
1367                 for(i=0;i<saved_start;++i) {
1368                     saved[i]=buf[vc->blocksize_1/2+i];
1369                 }
1370                 for(i=0;i<vc->blocksize_0/2;++i) {
1371                     saved[saved_start+i]=buf[vc->blocksize_1/2+saved_start+i]*swin[vc->blocksize_0/2-1-i];
1372                 }
1373             }
1374         } else {
1375             // --overlap/add
1376             for(k=j, i=0;i<saved_start;++i, k+=step) {
1377                 ret[k]=saved[i];
1378             }
1379             for(i=0;i<vc->blocksize_0/2;++i, k+=step) {
1380                 ret[k]=saved[saved_start+i]+buf[i]*swin[i];
1381             }
1382             retlen=saved_start+vc->blocksize_0/2;
1383             // -- save
1384             for(i=0;i<vc->blocksize_0/2;++i) {
1385                 saved[i]=buf[vc->blocksize_0/2+i]*swin[vc->blocksize_0/2-1-i];
1386             }
1387             saved_start=0;
1388         }
1389     }
1390     vc->saved_start=saved_start;
1391
1392     return retlen*vc->audio_channels;
1393 }
1394
1395 // Return the decoded audio packet through the standard api
1396
1397 static int vorbis_decode_frame(AVCodecContext *avccontext,
1398                         void *data, int *data_size,
1399                         uint8_t *buf, int buf_size)
1400 {
1401     vorbis_context *vc = avccontext->priv_data ;
1402     GetBitContext *gb = &(vc->gb);
1403
1404     int_fast16_t i, len;
1405
1406     if(!buf_size){
1407         return 0;
1408     }
1409
1410     AV_DEBUG("packet length %d \n", buf_size);
1411
1412     init_get_bits(gb, buf, buf_size*8);
1413
1414     len=vorbis_parse_audio_packet(vc);
1415
1416     if (len<=0) {
1417         *data_size=0;
1418         return buf_size;
1419     }
1420
1421     if (!vc->first_frame) {
1422         vc->first_frame=1;
1423         *data_size=0;
1424         return buf_size ;
1425     }
1426
1427     AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);
1428
1429     for(i=0;i<len;++i) {
1430         int_fast32_t tmp;
1431
1432         tmp=vc->ret[i]*32768;
1433         if (tmp>32767) tmp=32767;
1434         if (tmp<-32768) tmp=-32768;
1435         ((int16_t*)data)[i]=tmp;
1436     }
1437     *data_size=len*2;
1438
1439     return buf_size ;
1440 }
1441
1442 // Close decoder
1443
1444 static int vorbis_decode_close(AVCodecContext *avccontext) {
1445     vorbis_context *vc = avccontext->priv_data;
1446
1447     vorbis_free(vc);
1448
1449     return 0 ;
1450 }
1451
1452 AVCodec vorbis_decoder = {
1453     "vorbis",
1454     CODEC_TYPE_AUDIO,
1455     CODEC_ID_VORBIS,
1456     sizeof(vorbis_context),
1457     vorbis_decode_init,
1458     NULL,
1459     vorbis_decode_close,
1460     vorbis_decode_frame,
1461 };
1462