10l (malloc check with the wrong pointer)
[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., 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);
174             av_free(vc->floors[i].data.t0.book_list);
175             av_free(vc->floors[i].data.t0.lsp);
176         }
177         else {
178             av_free(vc->floors[i].data.t1.x_list);
179             av_free(vc->floors[i].data.t1.x_list_order);
180             av_free(vc->floors[i].data.t1.low_neighbour);
181             av_free(vc->floors[i].data.t1.high_neighbour);
182         }
183     }
184     av_freep(&vc->floors);
185
186     for(i=0;i<vc->mapping_count;++i) {
187         av_free(vc->mappings[i].magnitude);
188         av_free(vc->mappings[i].angle);
189         av_free(vc->mappings[i].mux);
190     }
191     av_freep(&vc->mappings);
192 }
193
194 // Parse setup header -------------------------------------------------
195
196 // Process codebooks part
197
198 static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc) {
199     uint_fast16_t cb;
200     uint_fast8_t *tmp_vlc_bits;
201     uint_fast32_t *tmp_vlc_codes;
202     GetBitContext *gb=&vc->gb;
203
204     vc->codebook_count=get_bits(gb,8)+1;
205
206     AV_DEBUG(" Codebooks: %d \n", vc->codebook_count);
207
208     vc->codebooks=(vorbis_codebook *)av_mallocz(vc->codebook_count * sizeof(vorbis_codebook));
209     tmp_vlc_bits=(uint_fast8_t *)av_mallocz(V_MAX_VLCS * sizeof(uint_fast8_t));
210     tmp_vlc_codes=(uint_fast32_t *)av_mallocz(V_MAX_VLCS * sizeof(uint_fast32_t));
211
212     for(cb=0;cb<vc->codebook_count;++cb) {
213         vorbis_codebook *codebook_setup=&vc->codebooks[cb];
214         uint_fast8_t ordered;
215         uint_fast32_t t, used_entries=0;
216         uint_fast32_t entries;
217
218         AV_DEBUG(" %d. Codebook \n", cb);
219
220         if (get_bits(gb, 24)!=0x564342) {
221             av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook setup data corrupt. \n", cb);
222             goto error;
223         }
224
225         codebook_setup->dimensions=get_bits(gb, 16);
226         if (codebook_setup->dimensions>16) {
227             av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook's dimension is too large (%d). \n", cb, codebook_setup->dimensions);
228             goto error;
229         }
230         entries=get_bits(gb, 24);
231         if (entries>V_MAX_VLCS) {
232             av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook has too many entries (%"PRIdFAST32"). \n", cb, entries);
233             goto error;
234         }
235
236         ordered=get_bits1(gb);
237
238         AV_DEBUG(" codebook_dimensions %d, codebook_entries %d \n", codebook_setup->dimensions, entries);
239
240         if (!ordered) {
241             uint_fast16_t ce;
242             uint_fast8_t flag;
243             uint_fast8_t sparse=get_bits1(gb);
244
245             AV_DEBUG(" not ordered \n");
246
247             if (sparse) {
248                 AV_DEBUG(" sparse \n");
249
250                 used_entries=0;
251                 for(ce=0;ce<entries;++ce) {
252                     flag=get_bits1(gb);
253                     if (flag) {
254                         tmp_vlc_bits[ce]=get_bits(gb, 5)+1;
255                         ++used_entries;
256                     }
257                     else tmp_vlc_bits[ce]=0;
258                 }
259             } else {
260                 AV_DEBUG(" not sparse \n");
261
262                 used_entries=entries;
263                 for(ce=0;ce<entries;++ce) {
264                     tmp_vlc_bits[ce]=get_bits(gb, 5)+1;
265                 }
266             }
267         } else {
268             uint_fast16_t current_entry=0;
269             uint_fast8_t current_length=get_bits(gb, 5)+1;
270
271             AV_DEBUG(" ordered, current length: %d \n", current_length);  //FIXME
272
273             used_entries=entries;
274             for(;current_entry<used_entries;++current_length) {
275                 uint_fast16_t i, number;
276
277                 AV_DEBUG(" number bits: %d ", ilog(entries - current_entry));
278
279                 number=get_bits(gb, ilog(entries - current_entry));
280
281                 AV_DEBUG(" number: %d \n", number);
282
283                 for(i=current_entry;i<number+current_entry;++i) {
284                     if (i<used_entries) tmp_vlc_bits[i]=current_length;
285                 }
286
287                 current_entry+=number;
288             }
289             if (current_entry>used_entries) {
290                 av_log(vc->avccontext, AV_LOG_ERROR, " More codelengths than codes in codebook. \n");
291                 goto error;
292             }
293         }
294
295         codebook_setup->lookup_type=get_bits(gb, 4);
296
297         AV_DEBUG(" lookup type: %d : %s \n", codebook_setup->lookup_type, codebook_setup->lookup_type ? "vq" : "no lookup" );
298
299 // If the codebook is used for (inverse) VQ, calculate codevectors.
300
301         if (codebook_setup->lookup_type==1) {
302             uint_fast16_t i, j, k;
303             uint_fast16_t codebook_lookup_values=nth_root(entries, codebook_setup->dimensions);
304             uint_fast16_t codebook_multiplicands[codebook_lookup_values];
305
306             float codebook_minimum_value=vorbisfloat2float(get_bits_long_le(gb, 32));
307             float codebook_delta_value=vorbisfloat2float(get_bits_long_le(gb, 32));
308             uint_fast8_t codebook_value_bits=get_bits(gb, 4)+1;
309             uint_fast8_t codebook_sequence_p=get_bits1(gb);
310
311             AV_DEBUG(" We expect %d numbers for building the codevectors. \n", codebook_lookup_values);
312             AV_DEBUG("  delta %f minmum %f \n", codebook_delta_value, codebook_minimum_value);
313
314             for(i=0;i<codebook_lookup_values;++i) {
315                 codebook_multiplicands[i]=get_bits(gb, codebook_value_bits);
316
317                 AV_DEBUG(" multiplicands*delta+minmum : %e \n", (float)codebook_multiplicands[i]*codebook_delta_value+codebook_minimum_value);
318                 AV_DEBUG(" multiplicand %d \n", codebook_multiplicands[i]);
319             }
320
321 // Weed out unused vlcs and build codevector vector
322             codebook_setup->codevectors=(float *)av_mallocz(used_entries*codebook_setup->dimensions * sizeof(float));
323             for(j=0, i=0;i<entries;++i) {
324                 uint_fast8_t dim=codebook_setup->dimensions;
325
326                 if (tmp_vlc_bits[i]) {
327                     float last=0.0;
328                     uint_fast32_t lookup_offset=i;
329
330 #ifdef V_DEBUG
331                     av_log(vc->avccontext, AV_LOG_INFO, "Lookup offset %d ,", i);
332 #endif
333
334                     for(k=0;k<dim;++k) {
335                         uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values;
336                         codebook_setup->codevectors[j*dim+k]=codebook_multiplicands[multiplicand_offset]*codebook_delta_value+codebook_minimum_value+last;
337                         if (codebook_sequence_p) {
338                             last=codebook_setup->codevectors[j*dim+k];
339                         }
340                         lookup_offset/=codebook_lookup_values;
341                     }
342                     tmp_vlc_bits[j]=tmp_vlc_bits[i];
343
344 #ifdef V_DEBUG
345                     av_log(vc->avccontext, AV_LOG_INFO, "real lookup offset %d, vector: ", j);
346                     for(k=0;k<dim;++k) {
347                         av_log(vc->avccontext, AV_LOG_INFO, " %f ", codebook_setup->codevectors[j*dim+k]);
348                     }
349                     av_log(vc->avccontext, AV_LOG_INFO, "\n");
350 #endif
351
352                     ++j;
353                 }
354             }
355             if (j!=used_entries) {
356                 av_log(vc->avccontext, AV_LOG_ERROR, "Bug in codevector vector building code. \n");
357                 goto error;
358             }
359             entries=used_entries;
360         }
361         else if (codebook_setup->lookup_type>=2) {
362             av_log(vc->avccontext, AV_LOG_ERROR, "Codebook lookup type not supported. \n");
363             goto error;
364         }
365
366 // Initialize VLC table
367         if (vorbis_len2vlc(vc, tmp_vlc_bits, tmp_vlc_codes, entries)) {
368             av_log(vc->avccontext, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");
369             goto error;
370         }
371         codebook_setup->maxdepth=0;
372         for(t=0;t<entries;++t)
373             if (tmp_vlc_bits[t]>=codebook_setup->maxdepth) codebook_setup->maxdepth=tmp_vlc_bits[t];
374
375         if(codebook_setup->maxdepth > 3*V_NB_BITS) codebook_setup->nb_bits=V_NB_BITS2;
376         else                                       codebook_setup->nb_bits=V_NB_BITS;
377
378         codebook_setup->maxdepth=(codebook_setup->maxdepth+codebook_setup->nb_bits-1)/codebook_setup->nb_bits;
379
380         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)) {
381             av_log(vc->avccontext, AV_LOG_ERROR, " Error generating vlc tables. \n");
382             goto error;
383         }
384     }
385
386     av_free(tmp_vlc_bits);
387     av_free(tmp_vlc_codes);
388     return 0;
389
390 // Error:
391 error:
392     av_free(tmp_vlc_bits);
393     av_free(tmp_vlc_codes);
394     return 1;
395 }
396
397 // Process time domain transforms part (unused in Vorbis I)
398
399 static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc) {
400     GetBitContext *gb=&vc->gb;
401     uint_fast8_t i;
402     uint_fast8_t vorbis_time_count=get_bits(gb, 6)+1;
403
404     for(i=0;i<vorbis_time_count;++i) {
405         uint_fast16_t vorbis_tdtransform=get_bits(gb, 16);
406
407         AV_DEBUG(" Vorbis time domain transform %d: %d \n", vorbis_time_count, vorbis_tdtransform);
408
409         if (vorbis_tdtransform) {
410             av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n");
411             return 1;
412         }
413     }
414     return 0;
415 }
416
417 // Process floors part
418
419 static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,
420                                          vorbis_floor_data *vfu, float *vec);
421 static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc,
422                                          vorbis_floor_data *vfu, float *vec);
423 static int vorbis_parse_setup_hdr_floors(vorbis_context *vc) {
424     GetBitContext *gb=&vc->gb;
425     uint_fast16_t i,j,k;
426
427     vc->floor_count=get_bits(gb, 6)+1;
428
429     vc->floors=(vorbis_floor *)av_mallocz(vc->floor_count * sizeof(vorbis_floor));
430
431     for (i=0;i<vc->floor_count;++i) {
432         vorbis_floor *floor_setup=&vc->floors[i];
433
434         floor_setup->floor_type=get_bits(gb, 16);
435
436         AV_DEBUG(" %d. floor type %d \n", i, floor_setup->floor_type);
437
438         if (floor_setup->floor_type==1) {
439             uint_fast8_t maximum_class=0;
440             uint_fast8_t rangebits;
441             uint_fast16_t floor1_values=2;
442
443             floor_setup->decode=vorbis_floor1_decode;
444
445             floor_setup->data.t1.partitions=get_bits(gb, 5);
446
447             AV_DEBUG(" %d.floor: %d partitions \n", i, floor_setup->data.t1.partitions);
448
449             for(j=0;j<floor_setup->data.t1.partitions;++j) {
450                 floor_setup->data.t1.partition_class[j]=get_bits(gb, 4);
451                 if (floor_setup->data.t1.partition_class[j]>maximum_class) maximum_class=floor_setup->data.t1.partition_class[j];
452
453                 AV_DEBUG(" %d. floor %d partition class %d \n", i, j, floor_setup->data.t1.partition_class[j]);
454
455             }
456
457             AV_DEBUG(" maximum class %d \n", maximum_class);
458
459             floor_setup->data.t1.maximum_class=maximum_class;
460
461             for(j=0;j<=maximum_class;++j) {
462                 floor_setup->data.t1.class_dimensions[j]=get_bits(gb, 3)+1;
463                 floor_setup->data.t1.class_subclasses[j]=get_bits(gb, 2);
464
465                 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]);
466
467                 if (floor_setup->data.t1.class_subclasses[j]) {
468                     floor_setup->data.t1.class_masterbook[j]=get_bits(gb, 8);
469
470                     AV_DEBUG("   masterbook: %d \n", floor_setup->data.t1.class_masterbook[j]);
471                 }
472
473                 for(k=0;k<(1<<floor_setup->data.t1.class_subclasses[j]);++k) {
474                     floor_setup->data.t1.subclass_books[j][k]=get_bits(gb, 8)-1;
475
476                     AV_DEBUG("    book %d. : %d \n", k, floor_setup->data.t1.subclass_books[j][k]);
477                 }
478             }
479
480             floor_setup->data.t1.multiplier=get_bits(gb, 2)+1;
481             floor_setup->data.t1.x_list_dim=2;
482
483             for(j=0;j<floor_setup->data.t1.partitions;++j) {
484                 floor_setup->data.t1.x_list_dim+=floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];
485             }
486
487             floor_setup->data.t1.x_list=(uint_fast16_t *)av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(uint_fast16_t));
488             floor_setup->data.t1.x_list_order=(uint_fast16_t *)av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(uint_fast16_t));
489             floor_setup->data.t1.low_neighbour=(uint_fast16_t *)av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(uint_fast16_t));
490             floor_setup->data.t1.high_neighbour=(uint_fast16_t *)av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(uint_fast16_t));
491
492
493             rangebits=get_bits(gb, 4);
494             floor_setup->data.t1.x_list[0] = 0;
495             floor_setup->data.t1.x_list[1] = (1<<rangebits);
496
497             for(j=0;j<floor_setup->data.t1.partitions;++j) {
498                 for(k=0;k<floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];++k,++floor1_values) {
499                     floor_setup->data.t1.x_list[floor1_values]=get_bits(gb, rangebits);
500
501                     AV_DEBUG(" %d. floor1 Y coord. %d \n", floor1_values, floor_setup->data.t1.x_list[floor1_values]);
502                 }
503             }
504
505 // Precalculate order of x coordinates - needed for decode
506
507             for(k=0;k<floor_setup->data.t1.x_list_dim;++k) {
508                 floor_setup->data.t1.x_list_order[k]=k;
509             }
510
511             for(k=0;k<floor_setup->data.t1.x_list_dim-1;++k) {   // FIXME optimize sorting ?
512                 for(j=k+1;j<floor_setup->data.t1.x_list_dim;++j) {
513                     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]]) {
514                         uint_fast16_t tmp=floor_setup->data.t1.x_list_order[k];
515                         floor_setup->data.t1.x_list_order[k]=floor_setup->data.t1.x_list_order[j];
516                         floor_setup->data.t1.x_list_order[j]=tmp;
517                     }
518                 }
519             }
520
521 // Precalculate low and high neighbours
522
523             for(k=2;k<floor_setup->data.t1.x_list_dim;++k) {
524                 floor_setup->data.t1.low_neighbour[k]=0;
525                 floor_setup->data.t1.high_neighbour[k]=1;  // correct according to SPEC requirements
526
527                 for (j=0;j<k;++j) {
528                     if ((floor_setup->data.t1.x_list[j]<floor_setup->data.t1.x_list[k]) &&
529                       (floor_setup->data.t1.x_list[j]>floor_setup->data.t1.x_list[floor_setup->data.t1.low_neighbour[k]])) {
530                         floor_setup->data.t1.low_neighbour[k]=j;
531                     }
532                     if ((floor_setup->data.t1.x_list[j]>floor_setup->data.t1.x_list[k]) &&
533                       (floor_setup->data.t1.x_list[j]<floor_setup->data.t1.x_list[floor_setup->data.t1.high_neighbour[k]])) {
534                         floor_setup->data.t1.high_neighbour[k]=j;
535                     }
536                 }
537             }
538         }
539         else if(floor_setup->floor_type==0) {
540             uint_fast8_t max_codebook_dim=0;
541
542             floor_setup->decode=vorbis_floor0_decode;
543
544             floor_setup->data.t0.order=get_bits(gb, 8);
545             floor_setup->data.t0.rate=get_bits(gb, 16);
546             floor_setup->data.t0.bark_map_size=get_bits(gb, 16);
547             floor_setup->data.t0.amplitude_bits=get_bits(gb, 6);
548             /* zero would result in a div by zero later *
549              * 2^0 - 1 == 0                             */
550             if (floor_setup->data.t0.amplitude_bits == 0) {
551               av_log(vc->avccontext, AV_LOG_ERROR,
552                      "Floor 0 amplitude bits is 0.\n");
553               return 1;
554             }
555             floor_setup->data.t0.amplitude_offset=get_bits(gb, 8);
556             floor_setup->data.t0.num_books=get_bits(gb, 4)+1;
557
558             /* allocate mem for booklist */
559             floor_setup->data.t0.book_list=
560                 av_malloc(floor_setup->data.t0.num_books);
561             if(!floor_setup->data.t0.book_list) { return 1; }
562             /* read book indexes */
563             {
564                 int idx;
565                 uint_fast8_t book_idx;
566                 for (idx=0;idx<floor_setup->data.t0.num_books;++idx) {
567                     book_idx=get_bits(gb, 8);
568                     floor_setup->data.t0.book_list[idx]=book_idx;
569                     if (vc->codebooks[book_idx].dimensions > max_codebook_dim)
570                         max_codebook_dim=vc->codebooks[book_idx].dimensions;
571
572                     if (floor_setup->data.t0.book_list[idx]>vc->codebook_count)
573                         return 1;
574                 }
575             }
576
577             /* allocate mem for lsp coefficients */
578             {
579                 /* codebook dim is for padding if codebook dim doesn't *
580                  * divide order+1 then we need to read more data       */
581                 floor_setup->data.t0.lsp=
582                     av_malloc((floor_setup->data.t0.order+1 + max_codebook_dim)
583                               * sizeof(float));
584                 if(!floor_setup->data.t0.lsp) { return 1; }
585             }
586
587 #ifdef V_DEBUG /* debug output parsed headers */
588             AV_DEBUG("floor0 order: %u\n", floor_setup->data.t0.order);
589             AV_DEBUG("floor0 rate: %u\n", floor_setup->data.t0.rate);
590             AV_DEBUG("floor0 bark map size: %u\n",
591               floor_setup->data.t0.bark_map_size);
592             AV_DEBUG("floor0 amplitude bits: %u\n",
593               floor_setup->data.t0.amplitude_bits);
594             AV_DEBUG("floor0 amplitude offset: %u\n",
595               floor_setup->data.t0.amplitude_offset);
596             AV_DEBUG("floor0 number of books: %u\n",
597               floor_setup->data.t0.num_books);
598             AV_DEBUG("floor0 book list pointer: %p\n",
599               floor_setup->data.t0.book_list);
600             {
601               int idx;
602               for (idx=0;idx<floor_setup->data.t0.num_books;++idx) {
603                 AV_DEBUG( "  Book %d: %u\n",
604                   idx+1,
605                   floor_setup->data.t0.book_list[idx] );
606               }
607             }
608 #endif
609         }
610         else {
611             av_log(vc->avccontext, AV_LOG_ERROR, "Invalid floor type!\n");
612             return 1;
613         }
614     }
615     return 0;
616 }
617
618 // Process residues part
619
620 static int vorbis_parse_setup_hdr_residues(vorbis_context *vc){
621     GetBitContext *gb=&vc->gb;
622     uint_fast8_t i, j, k;
623
624     vc->residue_count=get_bits(gb, 6)+1;
625     vc->residues=(vorbis_residue *)av_mallocz(vc->residue_count * sizeof(vorbis_residue));
626
627     AV_DEBUG(" There are %d residues. \n", vc->residue_count);
628
629     for(i=0;i<vc->residue_count;++i) {
630         vorbis_residue *res_setup=&vc->residues[i];
631         uint_fast8_t cascade[64];
632         uint_fast8_t high_bits;
633         uint_fast8_t low_bits;
634
635         res_setup->type=get_bits(gb, 16);
636
637         AV_DEBUG(" %d. residue type %d \n", i, res_setup->type);
638
639         res_setup->begin=get_bits(gb, 24);
640         res_setup->end=get_bits(gb, 24);
641         res_setup->partition_size=get_bits(gb, 24)+1;
642         res_setup->classifications=get_bits(gb, 6)+1;
643         res_setup->classbook=get_bits(gb, 8);
644
645         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,
646           res_setup->classifications, res_setup->classbook);
647
648         for(j=0;j<res_setup->classifications;++j) {
649             high_bits=0;
650             low_bits=get_bits(gb, 3);
651             if (get_bits1(gb)) {
652                 high_bits=get_bits(gb, 5);
653             }
654             cascade[j]=(high_bits<<3)+low_bits;
655
656             AV_DEBUG("     %d class casscade depth: %d \n", j, ilog(cascade[j]));
657         }
658
659         res_setup->maxpass=0;
660         for(j=0;j<res_setup->classifications;++j) {
661             for(k=0;k<8;++k) {
662                 if (cascade[j]&(1<<k)) {
663                         res_setup->books[j][k]=get_bits(gb, 8);
664
665                     AV_DEBUG("     %d class casscade depth %d book: %d \n", j, k, res_setup->books[j][k]);
666
667                     if (k>res_setup->maxpass) {
668                         res_setup->maxpass=k;
669                     }
670                 } else {
671                     res_setup->books[j][k]=-1;
672                 }
673             }
674         }
675     }
676     return 0;
677 }
678
679 // Process mappings part
680
681 static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc) {
682     GetBitContext *gb=&vc->gb;
683     uint_fast8_t i, j;
684
685     vc->mapping_count=get_bits(gb, 6)+1;
686     vc->mappings=(vorbis_mapping *)av_mallocz(vc->mapping_count * sizeof(vorbis_mapping));
687
688     AV_DEBUG(" There are %d mappings. \n", vc->mapping_count);
689
690     for(i=0;i<vc->mapping_count;++i) {
691         vorbis_mapping *mapping_setup=&vc->mappings[i];
692
693         if (get_bits(gb, 16)) {
694             av_log(vc->avccontext, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n");
695             return 1;
696         }
697         if (get_bits1(gb)) {
698             mapping_setup->submaps=get_bits(gb, 4)+1;
699         } else {
700             mapping_setup->submaps=1;
701         }
702
703         if (get_bits1(gb)) {
704             mapping_setup->coupling_steps=get_bits(gb, 8)+1;
705             mapping_setup->magnitude=(uint_fast8_t *)av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
706             mapping_setup->angle=(uint_fast8_t *)av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
707             for(j=0;j<mapping_setup->coupling_steps;++j) {
708                 mapping_setup->magnitude[j]=get_bits(gb, ilog(vc->audio_channels-1));
709                 mapping_setup->angle[j]=get_bits(gb, ilog(vc->audio_channels-1));
710                 // FIXME: sanity checks
711             }
712         } else {
713             mapping_setup->coupling_steps=0;
714         }
715
716         AV_DEBUG("   %d mapping coupling steps: %d \n", i, mapping_setup->coupling_steps);
717
718         if(get_bits(gb, 2)) {
719             av_log(vc->avccontext, AV_LOG_ERROR, "%d. mapping setup data invalid. \n", i);
720             return 1; // following spec.
721         }
722
723         if (mapping_setup->submaps>1) {
724             mapping_setup->mux=(uint_fast8_t *)av_mallocz(vc->audio_channels * sizeof(uint_fast8_t));
725             for(j=0;j<vc->audio_channels;++j) {
726                 mapping_setup->mux[j]=get_bits(gb, 4);
727             }
728         }
729
730         for(j=0;j<mapping_setup->submaps;++j) {
731             get_bits(gb, 8); // FIXME check?
732             mapping_setup->submap_floor[j]=get_bits(gb, 8);
733             mapping_setup->submap_residue[j]=get_bits(gb, 8);
734
735             AV_DEBUG("   %d mapping %d submap : floor %d, residue %d \n", i, j, mapping_setup->submap_floor[j], mapping_setup->submap_residue[j]);
736         }
737     }
738     return 0;
739 }
740
741 // Process modes part
742
743 static void create_map( vorbis_context * vc, uint_fast8_t mode_number )
744 {
745     vorbis_floor * floors=vc->floors;
746     vorbis_floor0 * vf;
747     int idx;
748     int_fast32_t * map;
749     int_fast32_t n; //TODO: could theoretically be smaller?
750
751     n=(vc->modes[mode_number].blockflag ?
752        vc->blocksize_1 : vc->blocksize_0) / 2;
753     floors[mode_number].data.t0.map=
754         av_malloc((n+1) * sizeof(int_fast32_t)); // n+sentinel
755
756     map=floors[mode_number].data.t0.map;
757     vf=&floors[mode_number].data.t0;
758
759     for (idx=0; idx<n;++idx) {
760         map[idx]=floor( BARK((vf->rate*idx)/(2.0f*n)) *
761                               ((vf->bark_map_size)/
762                                BARK(vf->rate/2.0f )) );
763         if (vf->bark_map_size-1 < map[idx]) {
764             map[idx]=vf->bark_map_size-1;
765         }
766     }
767     map[n]=-1;
768     vf->map_size=n;
769
770 #   ifdef V_DEBUG
771     for(idx=0;idx<=n;++idx) {
772         AV_DEBUG("floor0 map: map at pos %d is %d\n",
773                  idx, map[idx]);
774     }
775 #   endif
776 }
777
778 static int vorbis_parse_setup_hdr_modes(vorbis_context *vc) {
779     GetBitContext *gb=&vc->gb;
780     uint_fast8_t i;
781
782     vc->mode_count=get_bits(gb, 6)+1;
783     vc->modes=(vorbis_mode *)av_mallocz(vc->mode_count * sizeof(vorbis_mode));
784
785     AV_DEBUG(" There are %d modes.\n", vc->mode_count);
786
787     for(i=0;i<vc->mode_count;++i) {
788         vorbis_mode *mode_setup=&vc->modes[i];
789
790         mode_setup->blockflag=get_bits(gb, 1);
791         mode_setup->windowtype=get_bits(gb, 16); //FIXME check
792         mode_setup->transformtype=get_bits(gb, 16); //FIXME check
793         mode_setup->mapping=get_bits(gb, 8); //FIXME check
794
795         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);
796
797         if (vc->floors[i].floor_type == 0) { create_map( vc, i ); }
798     }
799     return 0;
800 }
801
802 // Process the whole setup header using the functions above
803
804 static int vorbis_parse_setup_hdr(vorbis_context *vc) {
805     GetBitContext *gb=&vc->gb;
806
807     if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') ||
808     (get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') ||
809     (get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) {
810         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n");
811         return 1;
812     }
813
814     if (vorbis_parse_setup_hdr_codebooks(vc)) {
815         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n");
816         return 2;
817     }
818     if (vorbis_parse_setup_hdr_tdtransforms(vc)) {
819         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n");
820         return 3;
821     }
822     if (vorbis_parse_setup_hdr_floors(vc)) {
823         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n");
824         return 4;
825     }
826     if (vorbis_parse_setup_hdr_residues(vc)) {
827         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n");
828         return 5;
829     }
830     if (vorbis_parse_setup_hdr_mappings(vc)) {
831         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n");
832         return 6;
833     }
834     if (vorbis_parse_setup_hdr_modes(vc)) {
835         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n");
836         return 7;
837     }
838     if (!get_bits1(gb)) {
839         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n");
840         return 8; // framing flag bit unset error
841     }
842
843     return 0;
844 }
845
846 // Process the identification header
847
848 static int vorbis_parse_id_hdr(vorbis_context *vc){
849     GetBitContext *gb=&vc->gb;
850     uint_fast8_t bl0, bl1;
851     const float *vwin[8]={ vwin64, vwin128, vwin256, vwin512, vwin1024, vwin2048, vwin4096, vwin8192 };
852
853     if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') ||
854     (get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') ||
855     (get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) {
856         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n");
857         return 1;
858     }
859
860     vc->version=get_bits_long_le(gb, 32);    //FIXME check 0
861     vc->audio_channels=get_bits(gb, 8);   //FIXME check >0
862     vc->audio_samplerate=get_bits_long_le(gb, 32);   //FIXME check >0
863     vc->bitrate_maximum=get_bits_long_le(gb, 32);
864     vc->bitrate_nominal=get_bits_long_le(gb, 32);
865     vc->bitrate_minimum=get_bits_long_le(gb, 32);
866     bl0=get_bits(gb, 4);
867     bl1=get_bits(gb, 4);
868     vc->blocksize_0=(1<<bl0);
869     vc->blocksize_1=(1<<bl1);
870     if (bl0>13 || bl0<6 || bl1>13 || bl1<6) {
871         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n");
872         return 3;
873     }
874     vc->swin=vwin[bl0-6];
875     vc->lwin=vwin[bl1-6];
876
877     if ((get_bits1(gb)) == 0) {
878         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n");
879         return 2;
880     }
881
882     vc->channel_residues=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
883     vc->channel_floors=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
884     vc->saved=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
885     vc->ret=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
886     vc->buf=(float *)av_malloc(vc->blocksize_1 * sizeof(float));
887     vc->buf_tmp=(float *)av_malloc(vc->blocksize_1 * sizeof(float));
888     vc->saved_start=0;
889
890     ff_mdct_init(&vc->mdct0, bl0, 1);
891     ff_mdct_init(&vc->mdct1, bl1, 1);
892
893     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 ",
894             vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize_0, vc->blocksize_1);
895
896 /*
897     BLK=vc->blocksize_0;
898     for(i=0;i<BLK/2;++i) {
899         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)));
900     }
901 */
902
903     return 0;
904 }
905
906 // Process the extradata using the functions above (identification header, setup header)
907
908 static int vorbis_decode_init(AVCodecContext *avccontext) {
909     vorbis_context *vc = avccontext->priv_data ;
910     uint8_t *headers = avccontext->extradata;
911     int headers_len=avccontext->extradata_size;
912     uint8_t *header_start[3];
913     int header_len[3];
914     GetBitContext *gb = &(vc->gb);
915     int i, j, hdr_type;
916
917     vc->avccontext = avccontext;
918
919     if (!headers_len) {
920         av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
921         return -1;
922     }
923
924     if(headers[0] == 0 && headers[1] == 30) {
925         for(i = 0; i < 3; i++){
926             header_len[i] = *headers++ << 8;
927             header_len[i] += *headers++;
928             header_start[i] = headers;
929             headers += header_len[i];
930         }
931     } else if(headers[0] == 2) {
932         for(j=1,i=0;i<2;++i, ++j) {
933             header_len[i]=0;
934             while(j<headers_len && headers[j]==0xff) {
935                 header_len[i]+=0xff;
936                 ++j;
937             }
938             if (j>=headers_len) {
939                 av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
940                 return -1;
941             }
942             header_len[i]+=headers[j];
943         }
944         header_len[2]=headers_len-header_len[0]-header_len[1]-j;
945         headers+=j;
946         header_start[0] = headers;
947         header_start[1] = header_start[0] + header_len[0];
948         header_start[2] = header_start[1] + header_len[1];
949     } else {
950         av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
951         return -1;
952     }
953
954     init_get_bits(gb, header_start[0], header_len[0]*8);
955     hdr_type=get_bits(gb, 8);
956     if (hdr_type!=1) {
957         av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n");
958         return -1;
959     }
960     if (vorbis_parse_id_hdr(vc)) {
961         av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n");
962         vorbis_free(vc);
963         return -1;
964     }
965
966     init_get_bits(gb, header_start[2], header_len[2]*8);
967     hdr_type=get_bits(gb, 8);
968     if (hdr_type!=5) {
969         av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");
970         return -1;
971     }
972     if (vorbis_parse_setup_hdr(vc)) {
973         av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");
974         vorbis_free(vc);
975         return -1;
976     }
977
978     avccontext->channels = vc->audio_channels;
979     avccontext->sample_rate = vc->audio_samplerate;
980
981     return 0 ;
982 }
983
984 // Decode audiopackets -------------------------------------------------
985
986 // Read and decode floor
987
988 static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,
989                                          vorbis_floor_data *vfu, float *vec) {
990     vorbis_floor0 * vf=&vfu->t0;
991     float * lsp=vf->lsp;
992     uint_fast32_t amplitude;
993     uint_fast32_t book_idx;
994
995     amplitude=get_bits(&vc->gb, vf->amplitude_bits);
996     if (amplitude>0) {
997         float last = 0;
998         uint_fast16_t lsp_len = 0;
999         uint_fast16_t idx;
1000         vorbis_codebook codebook;
1001
1002         book_idx=get_bits(&vc->gb, ilog(vf->num_books));
1003         if ( book_idx >= vf->num_books ) {
1004             av_log( vc->avccontext, AV_LOG_ERROR,
1005                     "floor0 dec: booknumber too high!\n" );
1006             //FIXME: look above
1007         }
1008         AV_DEBUG( "floor0 dec: booknumber: %u\n", book_idx );
1009         codebook=vc->codebooks[vf->book_list[book_idx]];
1010
1011         while (lsp_len<vf->order) {
1012             int vec_off;
1013
1014             AV_DEBUG( "floor0 dec: book dimension: %d\n", codebook.dimensions );
1015             AV_DEBUG( "floor0 dec: maximum depth: %d\n", codebook.maxdepth );
1016             /* read temp vector */
1017             vec_off=get_vlc2(&vc->gb,
1018                              codebook.vlc.table,
1019                              codebook.nb_bits,
1020                              codebook.maxdepth ) *
1021                              codebook.dimensions;
1022             AV_DEBUG( "floor0 dec: vector offset: %d\n", vec_off );
1023             /* copy each vector component and add last to it */
1024             for (idx=0; idx<codebook.dimensions; ++idx) {
1025                 lsp[lsp_len+idx]=codebook.codevectors[vec_off+idx]+last;
1026             }
1027             last=lsp[lsp_len+idx-1]; /* set last to last vector component */
1028
1029             lsp_len += codebook.dimensions;
1030         }
1031 #ifdef V_DEBUG
1032         /* DEBUG: output lsp coeffs */
1033         {
1034             int idx;
1035             for ( idx = 0; idx < lsp_len; ++idx )
1036                 AV_DEBUG("floor0 dec: coeff at %d is %f\n", idx, lsp[idx] );
1037         }
1038 #endif
1039
1040         /* synthesize floor output vector */
1041         {
1042             int i;
1043             int order=vf->order;
1044             float wstep=M_PI/vf->bark_map_size;
1045
1046             for(i=0;i<order;i++) { lsp[i]=2.0f*cos(lsp[i]); }
1047
1048             AV_DEBUG("floor0 synth: map_size=%d; m=%d; wstep=%f\n",
1049                      vf->map_size, order, wstep);
1050
1051             i=0;
1052             while(i<vf->map_size) {
1053                 int j, iter_cond=vf->map[i];
1054                 float p=0.5f;
1055                 float q=0.5f;
1056                 float two_cos_w=2.0f*cos(wstep*iter_cond); // needed all times
1057
1058                 /* similar part for the q and p products */
1059                 for(j=0;j<order;j+=2) {
1060                     q *= lsp[j]  -two_cos_w;
1061                     p *= lsp[j+1]-two_cos_w;
1062                 }
1063                 if(j==order) { // even order
1064                     p *= p*(2.0f-two_cos_w);
1065                     q *= q*(2.0f+two_cos_w);
1066                 }
1067                 else { // odd order
1068                     q *= two_cos_w-lsp[j]; // one more time for q
1069
1070                     /* final step and square */
1071                     p *= p*(4.f-two_cos_w*two_cos_w);
1072                     q *= q;
1073                 }
1074
1075                 /* calculate linear floor value */
1076                 {
1077                     q=exp( (
1078                              ( (amplitude*vf->amplitude_offset)/
1079                                (((1<<vf->amplitude_bits)-1) * sqrt(p+q)) )
1080                              - vf->amplitude_offset ) * .11512925f
1081                          );
1082                 }
1083
1084                 /* fill vector */
1085                 do { vec[i]=q; ++i; }while(vf->map[i]==iter_cond);
1086             }
1087         }
1088     }
1089     else {
1090         /* this channel is unused */
1091         return 1;
1092     }
1093
1094     AV_DEBUG(" Floor0 decoded\n");
1095
1096     return 0;
1097 }
1098 static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc, vorbis_floor_data *vfu, float *vec) {
1099     vorbis_floor1 * vf=&vfu->t1;
1100     GetBitContext *gb=&vc->gb;
1101     uint_fast16_t range_v[4]={ 256, 128, 86, 64 };
1102     uint_fast16_t range=range_v[vf->multiplier-1];
1103     uint_fast16_t floor1_Y[vf->x_list_dim];
1104     uint_fast16_t floor1_Y_final[vf->x_list_dim];
1105     uint_fast8_t floor1_flag[vf->x_list_dim];
1106     uint_fast8_t class_;
1107     uint_fast8_t cdim;
1108     uint_fast8_t cbits;
1109     uint_fast8_t csub;
1110     uint_fast8_t cval;
1111     int_fast16_t book;
1112     uint_fast16_t offset;
1113     uint_fast16_t i,j;
1114     uint_fast16_t *floor_x_sort=vf->x_list_order;
1115     /*u*/int_fast16_t adx, ady, off, predicted; // WTF ? dy/adx= (unsigned)dy/adx ?
1116     int_fast16_t dy, err;
1117     uint_fast16_t lx,hx, ly, hy=0;
1118
1119
1120     if (!get_bits1(gb)) return 1; // silence
1121
1122 // Read values (or differences) for the floor's points
1123
1124     floor1_Y[0]=get_bits(gb, ilog(range-1));
1125     floor1_Y[1]=get_bits(gb, ilog(range-1));
1126
1127     AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);
1128
1129     offset=2;
1130     for(i=0;i<vf->partitions;++i) {
1131         class_=vf->partition_class[i];
1132         cdim=vf->class_dimensions[class_];
1133         cbits=vf->class_subclasses[class_];
1134         csub=(1<<cbits)-1;
1135         cval=0;
1136
1137         AV_DEBUG("Cbits %d \n", cbits);
1138
1139         if (cbits) { // this reads all subclasses for this partition's class
1140             cval=get_vlc2(gb, vc->codebooks[vf->class_masterbook[class_]].vlc.table,
1141             vc->codebooks[vf->class_masterbook[class_]].nb_bits, 3);
1142         }
1143
1144         for(j=0;j<cdim;++j) {
1145             book=vf->subclass_books[class_][cval & csub];
1146
1147             AV_DEBUG("book %d Cbits %d cval %d  bits:%d \n", book, cbits, cval, get_bits_count(gb));
1148
1149             cval=cval>>cbits;
1150             if (book>0) {
1151                 floor1_Y[offset+j]=get_vlc2(gb, vc->codebooks[book].vlc.table,
1152                 vc->codebooks[book].nb_bits, 3);
1153             } else {
1154                 floor1_Y[offset+j]=0;
1155             }
1156
1157             AV_DEBUG(" floor(%d) = %d \n", vf->x_list[offset+j], floor1_Y[offset+j]);
1158         }
1159         offset+=cdim;
1160     }
1161
1162 // Amplitude calculation from the differences
1163
1164     floor1_flag[0]=1;
1165     floor1_flag[1]=1;
1166     floor1_Y_final[0]=floor1_Y[0];
1167     floor1_Y_final[1]=floor1_Y[1];
1168
1169     for(i=2;i<vf->x_list_dim;++i) {
1170         uint_fast16_t val, highroom, lowroom, room;
1171         uint_fast16_t high_neigh_offs;
1172         uint_fast16_t low_neigh_offs;
1173
1174         low_neigh_offs=vf->low_neighbour[i];
1175         high_neigh_offs=vf->high_neighbour[i];
1176         dy=floor1_Y_final[high_neigh_offs]-floor1_Y_final[low_neigh_offs];  // render_point begin
1177         adx=vf->x_list[high_neigh_offs]-vf->x_list[low_neigh_offs];
1178         ady= ABS(dy);
1179         err=ady*(vf->x_list[i]-vf->x_list[low_neigh_offs]);
1180         off=err/adx;
1181         if (dy<0) {
1182             predicted=floor1_Y_final[low_neigh_offs]-off;
1183         } else {
1184             predicted=floor1_Y_final[low_neigh_offs]+off;
1185         } // render_point end
1186
1187         val=floor1_Y[i];
1188         highroom=range-predicted;
1189         lowroom=predicted;
1190         if (highroom < lowroom) {
1191             room=highroom*2;
1192         } else {
1193             room=lowroom*2;   // SPEC mispelling
1194         }
1195         if (val) {
1196             floor1_flag[low_neigh_offs]=1;
1197             floor1_flag[high_neigh_offs]=1;
1198             floor1_flag[i]=1;
1199             if (val>=room) {
1200                 if (highroom > lowroom) {
1201                     floor1_Y_final[i]=val-lowroom+predicted;
1202                 } else {
1203                     floor1_Y_final[i]=predicted-val+highroom-1;
1204                 }
1205             } else {
1206                 if (val & 1) {
1207                     floor1_Y_final[i]=predicted-(val+1)/2;
1208                 } else {
1209                     floor1_Y_final[i]=predicted+val/2;
1210                 }
1211             }
1212         } else {
1213             floor1_flag[i]=0;
1214             floor1_Y_final[i]=predicted;
1215         }
1216
1217         AV_DEBUG(" Decoded floor(%d) = %d / val %d \n", vf->x_list[i], floor1_Y_final[i], val);
1218     }
1219
1220 // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?
1221
1222     hx=0;
1223     lx=0;
1224     ly=floor1_Y_final[0]*vf->multiplier;  // conforms to SPEC
1225
1226     vec[0]=floor1_inverse_db_table[ly];
1227
1228     for(i=1;i<vf->x_list_dim;++i) {
1229         AV_DEBUG(" Looking at post %d \n", i);
1230
1231         if (floor1_flag[floor_x_sort[i]]) {   // SPEC mispelled
1232             int_fast16_t x, y, dy, base, sy; // if uncommented: dy = -32 adx = 2  base = 2blablabla ?????
1233
1234             hy=floor1_Y_final[floor_x_sort[i]]*vf->multiplier;
1235             hx=vf->x_list[floor_x_sort[i]];
1236
1237             dy=hy-ly;
1238             adx=hx-lx;
1239             ady= (dy<0) ? -dy:dy;//ABS(dy);
1240             base=dy/adx;
1241
1242             AV_DEBUG(" dy %d  adx %d base %d = %d \n", dy, adx, base, dy/adx);
1243
1244             x=lx;
1245             y=ly;
1246             err=0;
1247             if (dy<0) {
1248                 sy=base-1;
1249             } else {
1250                 sy=base+1;
1251             }
1252             ady=ady-(base<0 ? -base : base)*adx;
1253             vec[x]=floor1_inverse_db_table[y];
1254
1255             AV_DEBUG(" vec[ %d ] = %d \n", x, y);
1256
1257             for(x=lx+1;(x<hx) && (x<vf->x_list[1]);++x) {
1258                 err+=ady;
1259                 if (err>=adx) {
1260                     err-=adx;
1261                     y+=sy;
1262                 } else {
1263                     y+=base;
1264                 }
1265                 vec[x]=floor1_inverse_db_table[y];
1266
1267                 AV_DEBUG(" vec[ %d ] = %d \n", x, y);
1268             }
1269
1270 /*            for(j=1;j<hx-lx+1;++j) {  // iterating render_point
1271                 dy=hy-ly;
1272                 adx=hx-lx;
1273                 ady= dy<0 ? -dy : dy;
1274                 err=ady*j;
1275                 off=err/adx;
1276                 if (dy<0) {
1277                     predicted=ly-off;
1278                 } else {
1279                     predicted=ly+off;
1280                 }
1281                 if (lx+j < vf->x_list[1]) {
1282                     vec[lx+j]=floor1_inverse_db_table[predicted];
1283                 }
1284             }*/
1285
1286             lx=hx;
1287             ly=hy;
1288         }
1289     }
1290
1291     if (hx<vf->x_list[1]) {
1292         for(i=hx;i<vf->x_list[1];++i) {
1293             vec[i]=floor1_inverse_db_table[hy];
1294         }
1295     }
1296
1297     AV_DEBUG(" Floor decoded\n");
1298
1299     return 0;
1300 }
1301
1302 // Read and decode residue
1303
1304 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) {
1305     GetBitContext *gb=&vc->gb;
1306     uint_fast8_t c_p_c=vc->codebooks[vr->classbook].dimensions;
1307     uint_fast16_t n_to_read=vr->end-vr->begin;
1308     uint_fast16_t ptns_to_read=n_to_read/vr->partition_size;
1309     uint_fast8_t classifs[ptns_to_read*vc->audio_channels];
1310     uint_fast8_t pass;
1311     uint_fast8_t ch_used;
1312     uint_fast8_t i,j,l;
1313     uint_fast16_t k;
1314
1315     if (vr->type==2) {
1316         for(j=1;j<ch;++j) {
1317                 do_not_decode[0]&=do_not_decode[j];  // FIXME - clobbering input
1318         }
1319         if (do_not_decode[0]) return 0;
1320         ch_used=1;
1321     } else {
1322         ch_used=ch;
1323     }
1324
1325     AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);
1326
1327     for(pass=0;pass<=vr->maxpass;++pass) { // FIXME OPTIMIZE?
1328         uint_fast16_t voffset;
1329         uint_fast16_t partition_count;
1330         uint_fast16_t j_times_ptns_to_read;
1331
1332         voffset=vr->begin;
1333         for(partition_count=0;partition_count<ptns_to_read;) {  // SPEC        error
1334             if (!pass) {
1335                 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {
1336                     if (!do_not_decode[j]) {
1337                         uint_fast32_t temp=get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,
1338                         vc->codebooks[vr->classbook].nb_bits, 3);
1339
1340                         AV_DEBUG("Classword: %d \n", temp);
1341
1342                         assert(vr->classifications > 1 && vr->classifications<256 && temp<=65536); //needed for inverse[]
1343                         for(i=0;i<c_p_c;++i) {
1344                             uint_fast32_t temp2;
1345
1346                             temp2=(((uint_fast64_t)temp) * inverse[vr->classifications])>>32;
1347                             classifs[j_times_ptns_to_read+partition_count+c_p_c-1-i]=temp-temp2*vr->classifications;
1348                             temp=temp2;
1349                         }
1350                     }
1351                     j_times_ptns_to_read+=ptns_to_read;
1352                 }
1353             }
1354             for(i=0;(i<c_p_c) && (partition_count<ptns_to_read);++i) {
1355                 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {
1356                     uint_fast16_t voffs;
1357
1358                     if (!do_not_decode[j]) {
1359                         uint_fast8_t vqclass=classifs[j_times_ptns_to_read+partition_count];
1360                         int_fast16_t vqbook=vr->books[vqclass][pass];
1361
1362                         if (vqbook>=0) {
1363                             uint_fast16_t coffs;
1364                             uint_fast16_t step=vr->partition_size/vc->codebooks[vqbook].dimensions;
1365                             vorbis_codebook codebook= vc->codebooks[vqbook];
1366
1367                             if (vr->type==0) {
1368
1369                                 voffs=voffset+j*vlen;
1370                                 for(k=0;k<step;++k) {
1371                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * codebook.dimensions;
1372                                     for(l=0;l<codebook.dimensions;++l) {
1373                                         vec[voffs+k+l*step]+=codebook.codevectors[coffs+l];  // FPMATH
1374                                     }
1375                                 }
1376                             }
1377                             else if (vr->type==1) {
1378                                 voffs=voffset+j*vlen;
1379                                 for(k=0;k<step;++k) {
1380                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * codebook.dimensions;
1381                                     for(l=0;l<codebook.dimensions;++l, ++voffs) {
1382                                         vec[voffs]+=codebook.codevectors[coffs+l];  // FPMATH
1383
1384                                         AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d  \n", pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);
1385                                     }
1386                                 }
1387                             }
1388                             else if (vr->type==2 && ch==2 && (voffset&1)==0 && (codebook.dimensions&1)==0) { // most frequent case optimized
1389                                 voffs=voffset>>1;
1390
1391                                 for(k=0;k<step;++k) {
1392                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * codebook.dimensions;
1393                                     for(l=0;l<codebook.dimensions;l+=2, voffs++) {
1394                                         vec[voffs     ]+=codebook.codevectors[coffs+l  ];  // FPMATH
1395                                         vec[voffs+vlen]+=codebook.codevectors[coffs+l+1];  // FPMATH
1396
1397                                         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);
1398                                     }
1399                                 }
1400
1401                             }
1402                             else if (vr->type==2) {
1403                                 voffs=voffset;
1404
1405                                 for(k=0;k<step;++k) {
1406                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * codebook.dimensions;
1407                                     for(l=0;l<codebook.dimensions;++l, ++voffs) {
1408                                         vec[voffs/ch+(voffs%ch)*vlen]+=codebook.codevectors[coffs+l];  // FPMATH FIXME use if and counter instead of / and %
1409
1410                                         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);
1411                                     }
1412                                 }
1413                             } else {
1414                                 av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");
1415                                 return 1;
1416                             }
1417                         }
1418                     }
1419                     j_times_ptns_to_read+=ptns_to_read;
1420                 }
1421                 ++partition_count;
1422                 voffset+=vr->partition_size;
1423             }
1424         }
1425     }
1426     return 0;
1427 }
1428
1429 // Decode the audio packet using the functions above
1430 #define BIAS 385
1431
1432 static int vorbis_parse_audio_packet(vorbis_context *vc) {
1433     GetBitContext *gb=&vc->gb;
1434
1435     uint_fast8_t previous_window=0,next_window=0;
1436     uint_fast8_t mode_number;
1437     uint_fast16_t blocksize;
1438     int_fast32_t i,j;
1439     uint_fast8_t no_residue[vc->audio_channels];
1440     uint_fast8_t do_not_decode[vc->audio_channels];
1441     vorbis_mapping *mapping;
1442     float *ch_res_ptr=vc->channel_residues;
1443     float *ch_floor_ptr=vc->channel_floors;
1444     uint_fast8_t res_chan[vc->audio_channels];
1445     uint_fast8_t res_num=0;
1446     int_fast16_t retlen=0;
1447     uint_fast16_t saved_start=0;
1448
1449     if (get_bits1(gb)) {
1450         av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");
1451         return -1; // packet type not audio
1452     }
1453
1454     if (vc->mode_count==1) {
1455         mode_number=0;
1456     } else {
1457         mode_number=get_bits(gb, ilog(vc->mode_count-1));
1458     }
1459     mapping=&vc->mappings[vc->modes[mode_number].mapping];
1460
1461     AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);
1462
1463     if (vc->modes[mode_number].blockflag) {
1464         previous_window=get_bits1(gb);
1465         next_window=get_bits1(gb);
1466     }
1467
1468     blocksize=vc->modes[mode_number].blockflag ? vc->blocksize_1 : vc->blocksize_0;
1469     memset(ch_res_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?
1470     memset(ch_floor_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?
1471
1472 // Decode floor
1473
1474     for(i=0;i<vc->audio_channels;++i) {
1475         vorbis_floor *floor;
1476         if (mapping->submaps>1) {
1477             floor=&vc->floors[mapping->submap_floor[mapping->mux[i]]];
1478         } else {
1479             floor=&vc->floors[mapping->submap_floor[0]];
1480         }
1481
1482         no_residue[i]=floor->decode(vc, &floor->data, ch_floor_ptr);
1483         ch_floor_ptr+=blocksize/2;
1484     }
1485
1486 // Nonzero vector propagate
1487
1488     for(i=mapping->coupling_steps-1;i>=0;--i) {
1489         if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {
1490             no_residue[mapping->magnitude[i]]=0;
1491             no_residue[mapping->angle[i]]=0;
1492         }
1493     }
1494
1495 // Decode residue
1496
1497     for(i=0;i<mapping->submaps;++i) {
1498         vorbis_residue *residue;
1499         uint_fast8_t ch=0;
1500
1501         for(j=0;j<vc->audio_channels;++j) {
1502             if ((mapping->submaps==1) || (i=mapping->mux[j])) {
1503                 res_chan[j]=res_num;
1504                 if (no_residue[j]) {
1505                     do_not_decode[ch]=1;
1506                 } else {
1507                     do_not_decode[ch]=0;
1508                 }
1509                 ++ch;
1510                 ++res_num;
1511             }
1512         }
1513         residue=&vc->residues[mapping->submap_residue[i]];
1514         vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);
1515
1516         ch_res_ptr+=ch*blocksize/2;
1517     }
1518
1519 // Inverse coupling
1520
1521     for(i=mapping->coupling_steps-1;i>=0;--i) { //warning: i has to be signed
1522         float *mag, *ang;
1523
1524         mag=vc->channel_residues+res_chan[mapping->magnitude[i]]*blocksize/2;
1525         ang=vc->channel_residues+res_chan[mapping->angle[i]]*blocksize/2;
1526         for(j=0;j<blocksize/2;++j) {
1527             float temp;
1528             if (mag[j]>0.0) {
1529                 if (ang[j]>0.0) {
1530                     ang[j]=mag[j]-ang[j];
1531                 } else {
1532                     temp=ang[j];
1533                     ang[j]=mag[j];
1534                     mag[j]+=temp;
1535                 }
1536             } else {
1537                 if (ang[j]>0.0) {
1538                     ang[j]+=mag[j];
1539                 } else {
1540                     temp=ang[j];
1541                     ang[j]=mag[j];
1542                     mag[j]-=temp;
1543                 }
1544             }
1545         }
1546     }
1547
1548 // Dotproduct
1549
1550     for(j=0, ch_floor_ptr=vc->channel_floors;j<vc->audio_channels;++j,ch_floor_ptr+=blocksize/2) {
1551         ch_res_ptr=vc->channel_residues+res_chan[j]*blocksize/2;
1552
1553         for(i=0;i<blocksize/2;++i) {
1554             ch_floor_ptr[i]*=ch_res_ptr[i]; //FPMATH
1555         }
1556     }
1557
1558 // MDCT, overlap/add, save data for next overlapping  FPMATH
1559
1560     for(j=0;j<vc->audio_channels;++j) {
1561         uint_fast8_t step=vc->audio_channels;
1562         uint_fast16_t k;
1563         float *saved=vc->saved+j*vc->blocksize_1/2;
1564         float *ret=vc->ret;
1565         const float *lwin=vc->lwin;
1566         const float *swin=vc->swin;
1567         float *buf=vc->buf;
1568         float *buf_tmp=vc->buf_tmp;
1569
1570         ch_floor_ptr=vc->channel_floors+j*blocksize/2;
1571
1572         saved_start=vc->saved_start;
1573
1574         ff_imdct_calc(vc->modes[mode_number].blockflag ? &vc->mdct1 : &vc->mdct0, buf, ch_floor_ptr, buf_tmp);
1575
1576         if (vc->modes[mode_number].blockflag) {
1577             // -- overlap/add
1578             if (previous_window) {
1579                 for(k=j, i=0;i<vc->blocksize_1/2;++i, k+=step) {
1580                     ret[k]=saved[i]+buf[i]*lwin[i]+BIAS;
1581                 }
1582                 retlen=vc->blocksize_1/2;
1583             } else {
1584                 buf += (vc->blocksize_1-vc->blocksize_0)/4;
1585                 for(k=j, i=0;i<vc->blocksize_0/2;++i, k+=step) {
1586                     ret[k]=saved[i]+buf[i]*swin[i]+BIAS;
1587                 }
1588                 buf += vc->blocksize_0/2;
1589                 for(i=0;i<(vc->blocksize_1-vc->blocksize_0)/4;++i, k+=step) {
1590                     ret[k]=buf[i]+BIAS;
1591                 }
1592                 buf=vc->buf;
1593                 retlen=vc->blocksize_0/2+(vc->blocksize_1-vc->blocksize_0)/4;
1594             }
1595             // -- save
1596             if (next_window) {
1597                 buf += vc->blocksize_1/2;
1598                 lwin += vc->blocksize_1/2-1;
1599                 for(i=0;i<vc->blocksize_1/2;++i) {
1600                     saved[i]=buf[i]*lwin[-i];
1601                 }
1602                 saved_start=0;
1603             } else {
1604                 saved_start=(vc->blocksize_1-vc->blocksize_0)/4;
1605                 buf += vc->blocksize_1/2;
1606                 for(i=0;i<saved_start;++i) {
1607                     saved[i]=buf[i];
1608                 }
1609                 swin += vc->blocksize_0/2-1;
1610                 for(i=0;i<vc->blocksize_0/2;++i) {
1611                     saved[saved_start+i]=buf[saved_start+i]*swin[-i];
1612                 }
1613             }
1614         } else {
1615             // --overlap/add
1616             for(k=j, i=0;i<saved_start;++i, k+=step) {
1617                 ret[k]=saved[i]+BIAS;
1618             }
1619             for(i=0;i<vc->blocksize_0/2;++i, k+=step) {
1620                 ret[k]=saved[saved_start+i]+buf[i]*swin[i]+BIAS;
1621             }
1622             retlen=saved_start+vc->blocksize_0/2;
1623             // -- save
1624             buf += vc->blocksize_0/2;
1625             swin += vc->blocksize_0/2-1;
1626             for(i=0;i<vc->blocksize_0/2;++i) {
1627                 saved[i]=buf[i]*swin[-i];
1628             }
1629             saved_start=0;
1630         }
1631     }
1632     vc->saved_start=saved_start;
1633
1634     return retlen*vc->audio_channels;
1635 }
1636
1637 // Return the decoded audio packet through the standard api
1638
1639 static int vorbis_decode_frame(AVCodecContext *avccontext,
1640                         void *data, int *data_size,
1641                         uint8_t *buf, int buf_size)
1642 {
1643     vorbis_context *vc = avccontext->priv_data ;
1644     GetBitContext *gb = &(vc->gb);
1645
1646     int_fast16_t i, len;
1647
1648     if(!buf_size){
1649         return 0;
1650     }
1651
1652     AV_DEBUG("packet length %d \n", buf_size);
1653
1654     init_get_bits(gb, buf, buf_size*8);
1655
1656     len=vorbis_parse_audio_packet(vc);
1657
1658     if (len<=0) {
1659         *data_size=0;
1660         return buf_size;
1661     }
1662
1663     if (!vc->first_frame) {
1664         vc->first_frame=1;
1665         *data_size=0;
1666         return buf_size ;
1667     }
1668
1669     AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);
1670
1671     for(i=0;i<len;++i) {
1672         int_fast32_t tmp= ((int32_t*)vc->ret)[i];
1673         if(tmp & 0xf0000){
1674 //            tmp= (0x43c0ffff - tmp)>>31; //ask gcc devs why this is slower
1675             if(tmp > 0x43c0ffff) tmp= 0xFFFF;
1676             else                 tmp= 0;
1677         }
1678         ((int16_t*)data)[i]=tmp - 0x8000;
1679     }
1680
1681     *data_size=len*2;
1682
1683     return buf_size ;
1684 }
1685
1686 // Close decoder
1687
1688 static int vorbis_decode_close(AVCodecContext *avccontext) {
1689     vorbis_context *vc = avccontext->priv_data;
1690
1691     vorbis_free(vc);
1692
1693     return 0 ;
1694 }
1695
1696 AVCodec vorbis_decoder = {
1697     "vorbis",
1698     CODEC_TYPE_AUDIO,
1699     CODEC_ID_VORBIS,
1700     sizeof(vorbis_context),
1701     vorbis_decode_init,
1702     NULL,
1703     vorbis_decode_close,
1704     vorbis_decode_frame,
1705 };
1706