sse and 3dnow implementations of float->int conversion and mdct windowing.
[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 //#define V_DEBUG
24 //#define AV_DEBUG(...) av_log(NULL, AV_LOG_INFO, __VA_ARGS__)
25
26 #include <math.h>
27
28 #define ALT_BITSTREAM_READER_LE
29 #include "avcodec.h"
30 #include "bitstream.h"
31 #include "dsputil.h"
32
33 #include "vorbis.h"
34
35 #define V_NB_BITS 8
36 #define V_NB_BITS2 11
37 #define V_MAX_VLCS (1<<16)
38
39 #ifndef V_DEBUG
40 #define AV_DEBUG(...)
41 #endif
42
43 #undef NDEBUG
44 #include <assert.h>
45
46 /* Helper functions */
47
48 /**
49  *  reads 0-32 bits when using the ALT_BITSTREAM_READER_LE bitstream reader
50  */
51 static unsigned int get_bits_long_le(GetBitContext *s, int n){
52     if(n<=17) return get_bits(s, n);
53     else{
54         int ret= get_bits(s, 16);
55         return ret | (get_bits(s, n-16) << 16);
56     }
57 }
58
59 #define ilog(i) av_log2(2*(i))
60
61 #define BARK(x) \
62     (13.1f*atan(0.00074f*(x))+2.24f*atan(1.85e-8f*(x)*(x))+1e-4f*(x))
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         if(vc->floors[i].floor_type==0) {
175             av_free(vc->floors[i].data.t0.map[0]);
176             av_free(vc->floors[i].data.t0.map[1]);
177             av_free(vc->floors[i].data.t0.book_list);
178             av_free(vc->floors[i].data.t0.lsp);
179         }
180         else {
181             av_free(vc->floors[i].data.t1.x_list);
182             av_free(vc->floors[i].data.t1.x_list_order);
183             av_free(vc->floors[i].data.t1.low_neighbour);
184             av_free(vc->floors[i].data.t1.high_neighbour);
185         }
186     }
187     av_freep(&vc->floors);
188
189     for(i=0;i<vc->mapping_count;++i) {
190         av_free(vc->mappings[i].magnitude);
191         av_free(vc->mappings[i].angle);
192         av_free(vc->mappings[i].mux);
193     }
194     av_freep(&vc->mappings);
195
196     if(vc->exp_bias){
197         av_freep(&vc->swin);
198         av_freep(&vc->lwin);
199     }
200 }
201
202 // Parse setup header -------------------------------------------------
203
204 // Process codebooks part
205
206 static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc) {
207     uint_fast16_t cb;
208     uint_fast8_t *tmp_vlc_bits;
209     uint_fast32_t *tmp_vlc_codes;
210     GetBitContext *gb=&vc->gb;
211
212     vc->codebook_count=get_bits(gb,8)+1;
213
214     AV_DEBUG(" Codebooks: %d \n", vc->codebook_count);
215
216     vc->codebooks=(vorbis_codebook *)av_mallocz(vc->codebook_count * sizeof(vorbis_codebook));
217     tmp_vlc_bits=(uint_fast8_t *)av_mallocz(V_MAX_VLCS * sizeof(uint_fast8_t));
218     tmp_vlc_codes=(uint_fast32_t *)av_mallocz(V_MAX_VLCS * sizeof(uint_fast32_t));
219
220     for(cb=0;cb<vc->codebook_count;++cb) {
221         vorbis_codebook *codebook_setup=&vc->codebooks[cb];
222         uint_fast8_t ordered;
223         uint_fast32_t t, used_entries=0;
224         uint_fast32_t entries;
225
226         AV_DEBUG(" %d. Codebook \n", cb);
227
228         if (get_bits(gb, 24)!=0x564342) {
229             av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook setup data corrupt. \n", cb);
230             goto error;
231         }
232
233         codebook_setup->dimensions=get_bits(gb, 16);
234         if (codebook_setup->dimensions>16) {
235             av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook's dimension is too large (%d). \n", cb, codebook_setup->dimensions);
236             goto error;
237         }
238         entries=get_bits(gb, 24);
239         if (entries>V_MAX_VLCS) {
240             av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook has too many entries (%"PRIdFAST32"). \n", cb, entries);
241             goto error;
242         }
243
244         ordered=get_bits1(gb);
245
246         AV_DEBUG(" codebook_dimensions %d, codebook_entries %d \n", codebook_setup->dimensions, entries);
247
248         if (!ordered) {
249             uint_fast16_t ce;
250             uint_fast8_t flag;
251             uint_fast8_t sparse=get_bits1(gb);
252
253             AV_DEBUG(" not ordered \n");
254
255             if (sparse) {
256                 AV_DEBUG(" sparse \n");
257
258                 used_entries=0;
259                 for(ce=0;ce<entries;++ce) {
260                     flag=get_bits1(gb);
261                     if (flag) {
262                         tmp_vlc_bits[ce]=get_bits(gb, 5)+1;
263                         ++used_entries;
264                     }
265                     else tmp_vlc_bits[ce]=0;
266                 }
267             } else {
268                 AV_DEBUG(" not sparse \n");
269
270                 used_entries=entries;
271                 for(ce=0;ce<entries;++ce) {
272                     tmp_vlc_bits[ce]=get_bits(gb, 5)+1;
273                 }
274             }
275         } else {
276             uint_fast16_t current_entry=0;
277             uint_fast8_t current_length=get_bits(gb, 5)+1;
278
279             AV_DEBUG(" ordered, current length: %d \n", current_length);  //FIXME
280
281             used_entries=entries;
282             for(;current_entry<used_entries;++current_length) {
283                 uint_fast16_t i, number;
284
285                 AV_DEBUG(" number bits: %d ", ilog(entries - current_entry));
286
287                 number=get_bits(gb, ilog(entries - current_entry));
288
289                 AV_DEBUG(" number: %d \n", number);
290
291                 for(i=current_entry;i<number+current_entry;++i) {
292                     if (i<used_entries) tmp_vlc_bits[i]=current_length;
293                 }
294
295                 current_entry+=number;
296             }
297             if (current_entry>used_entries) {
298                 av_log(vc->avccontext, AV_LOG_ERROR, " More codelengths than codes in codebook. \n");
299                 goto error;
300             }
301         }
302
303         codebook_setup->lookup_type=get_bits(gb, 4);
304
305         AV_DEBUG(" lookup type: %d : %s \n", codebook_setup->lookup_type, codebook_setup->lookup_type ? "vq" : "no lookup" );
306
307 // If the codebook is used for (inverse) VQ, calculate codevectors.
308
309         if (codebook_setup->lookup_type==1) {
310             uint_fast16_t i, j, k;
311             uint_fast16_t codebook_lookup_values=nth_root(entries, codebook_setup->dimensions);
312             uint_fast16_t codebook_multiplicands[codebook_lookup_values];
313
314             float codebook_minimum_value=vorbisfloat2float(get_bits_long_le(gb, 32));
315             float codebook_delta_value=vorbisfloat2float(get_bits_long_le(gb, 32));
316             uint_fast8_t codebook_value_bits=get_bits(gb, 4)+1;
317             uint_fast8_t codebook_sequence_p=get_bits1(gb);
318
319             AV_DEBUG(" We expect %d numbers for building the codevectors. \n", codebook_lookup_values);
320             AV_DEBUG("  delta %f minmum %f \n", codebook_delta_value, codebook_minimum_value);
321
322             for(i=0;i<codebook_lookup_values;++i) {
323                 codebook_multiplicands[i]=get_bits(gb, codebook_value_bits);
324
325                 AV_DEBUG(" multiplicands*delta+minmum : %e \n", (float)codebook_multiplicands[i]*codebook_delta_value+codebook_minimum_value);
326                 AV_DEBUG(" multiplicand %d \n", codebook_multiplicands[i]);
327             }
328
329 // Weed out unused vlcs and build codevector vector
330             codebook_setup->codevectors=(float *)av_mallocz(used_entries*codebook_setup->dimensions * sizeof(float));
331             for(j=0, i=0;i<entries;++i) {
332                 uint_fast8_t dim=codebook_setup->dimensions;
333
334                 if (tmp_vlc_bits[i]) {
335                     float last=0.0;
336                     uint_fast32_t lookup_offset=i;
337
338 #ifdef V_DEBUG
339                     av_log(vc->avccontext, AV_LOG_INFO, "Lookup offset %d ,", i);
340 #endif
341
342                     for(k=0;k<dim;++k) {
343                         uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values;
344                         codebook_setup->codevectors[j*dim+k]=codebook_multiplicands[multiplicand_offset]*codebook_delta_value+codebook_minimum_value+last;
345                         if (codebook_sequence_p) {
346                             last=codebook_setup->codevectors[j*dim+k];
347                         }
348                         lookup_offset/=codebook_lookup_values;
349                     }
350                     tmp_vlc_bits[j]=tmp_vlc_bits[i];
351
352 #ifdef V_DEBUG
353                     av_log(vc->avccontext, AV_LOG_INFO, "real lookup offset %d, vector: ", j);
354                     for(k=0;k<dim;++k) {
355                         av_log(vc->avccontext, AV_LOG_INFO, " %f ", codebook_setup->codevectors[j*dim+k]);
356                     }
357                     av_log(vc->avccontext, AV_LOG_INFO, "\n");
358 #endif
359
360                     ++j;
361                 }
362             }
363             if (j!=used_entries) {
364                 av_log(vc->avccontext, AV_LOG_ERROR, "Bug in codevector vector building code. \n");
365                 goto error;
366             }
367             entries=used_entries;
368         }
369         else if (codebook_setup->lookup_type>=2) {
370             av_log(vc->avccontext, AV_LOG_ERROR, "Codebook lookup type not supported. \n");
371             goto error;
372         }
373
374 // Initialize VLC table
375         if (vorbis_len2vlc(vc, tmp_vlc_bits, tmp_vlc_codes, entries)) {
376             av_log(vc->avccontext, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");
377             goto error;
378         }
379         codebook_setup->maxdepth=0;
380         for(t=0;t<entries;++t)
381             if (tmp_vlc_bits[t]>=codebook_setup->maxdepth) codebook_setup->maxdepth=tmp_vlc_bits[t];
382
383         if(codebook_setup->maxdepth > 3*V_NB_BITS) codebook_setup->nb_bits=V_NB_BITS2;
384         else                                       codebook_setup->nb_bits=V_NB_BITS;
385
386         codebook_setup->maxdepth=(codebook_setup->maxdepth+codebook_setup->nb_bits-1)/codebook_setup->nb_bits;
387
388         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)) {
389             av_log(vc->avccontext, AV_LOG_ERROR, " Error generating vlc tables. \n");
390             goto error;
391         }
392     }
393
394     av_free(tmp_vlc_bits);
395     av_free(tmp_vlc_codes);
396     return 0;
397
398 // Error:
399 error:
400     av_free(tmp_vlc_bits);
401     av_free(tmp_vlc_codes);
402     return 1;
403 }
404
405 // Process time domain transforms part (unused in Vorbis I)
406
407 static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc) {
408     GetBitContext *gb=&vc->gb;
409     uint_fast8_t i;
410     uint_fast8_t vorbis_time_count=get_bits(gb, 6)+1;
411
412     for(i=0;i<vorbis_time_count;++i) {
413         uint_fast16_t vorbis_tdtransform=get_bits(gb, 16);
414
415         AV_DEBUG(" Vorbis time domain transform %d: %d \n", vorbis_time_count, vorbis_tdtransform);
416
417         if (vorbis_tdtransform) {
418             av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n");
419             return 1;
420         }
421     }
422     return 0;
423 }
424
425 // Process floors part
426
427 static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,
428                                          vorbis_floor_data *vfu, float *vec);
429 static void create_map( vorbis_context * vc, uint_fast8_t floor_number );
430 static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc,
431                                          vorbis_floor_data *vfu, float *vec);
432 static int vorbis_parse_setup_hdr_floors(vorbis_context *vc) {
433     GetBitContext *gb=&vc->gb;
434     uint_fast16_t i,j,k;
435
436     vc->floor_count=get_bits(gb, 6)+1;
437
438     vc->floors=(vorbis_floor *)av_mallocz(vc->floor_count * sizeof(vorbis_floor));
439
440     for (i=0;i<vc->floor_count;++i) {
441         vorbis_floor *floor_setup=&vc->floors[i];
442
443         floor_setup->floor_type=get_bits(gb, 16);
444
445         AV_DEBUG(" %d. floor type %d \n", i, floor_setup->floor_type);
446
447         if (floor_setup->floor_type==1) {
448             uint_fast8_t maximum_class=0;
449             uint_fast8_t rangebits;
450             uint_fast16_t floor1_values=2;
451
452             floor_setup->decode=vorbis_floor1_decode;
453
454             floor_setup->data.t1.partitions=get_bits(gb, 5);
455
456             AV_DEBUG(" %d.floor: %d partitions \n", i, floor_setup->data.t1.partitions);
457
458             for(j=0;j<floor_setup->data.t1.partitions;++j) {
459                 floor_setup->data.t1.partition_class[j]=get_bits(gb, 4);
460                 if (floor_setup->data.t1.partition_class[j]>maximum_class) maximum_class=floor_setup->data.t1.partition_class[j];
461
462                 AV_DEBUG(" %d. floor %d partition class %d \n", i, j, floor_setup->data.t1.partition_class[j]);
463
464             }
465
466             AV_DEBUG(" maximum class %d \n", maximum_class);
467
468             floor_setup->data.t1.maximum_class=maximum_class;
469
470             for(j=0;j<=maximum_class;++j) {
471                 floor_setup->data.t1.class_dimensions[j]=get_bits(gb, 3)+1;
472                 floor_setup->data.t1.class_subclasses[j]=get_bits(gb, 2);
473
474                 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]);
475
476                 if (floor_setup->data.t1.class_subclasses[j]) {
477                     floor_setup->data.t1.class_masterbook[j]=get_bits(gb, 8);
478
479                     AV_DEBUG("   masterbook: %d \n", floor_setup->data.t1.class_masterbook[j]);
480                 }
481
482                 for(k=0;k<(1<<floor_setup->data.t1.class_subclasses[j]);++k) {
483                     floor_setup->data.t1.subclass_books[j][k]=(int16_t)get_bits(gb, 8)-1;
484
485                     AV_DEBUG("    book %d. : %d \n", k, floor_setup->data.t1.subclass_books[j][k]);
486                 }
487             }
488
489             floor_setup->data.t1.multiplier=get_bits(gb, 2)+1;
490             floor_setup->data.t1.x_list_dim=2;
491
492             for(j=0;j<floor_setup->data.t1.partitions;++j) {
493                 floor_setup->data.t1.x_list_dim+=floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];
494             }
495
496             floor_setup->data.t1.x_list=(uint_fast16_t *)av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(uint_fast16_t));
497             floor_setup->data.t1.x_list_order=(uint_fast16_t *)av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(uint_fast16_t));
498             floor_setup->data.t1.low_neighbour=(uint_fast16_t *)av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(uint_fast16_t));
499             floor_setup->data.t1.high_neighbour=(uint_fast16_t *)av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(uint_fast16_t));
500
501
502             rangebits=get_bits(gb, 4);
503             floor_setup->data.t1.x_list[0] = 0;
504             floor_setup->data.t1.x_list[1] = (1<<rangebits);
505
506             for(j=0;j<floor_setup->data.t1.partitions;++j) {
507                 for(k=0;k<floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];++k,++floor1_values) {
508                     floor_setup->data.t1.x_list[floor1_values]=get_bits(gb, rangebits);
509
510                     AV_DEBUG(" %d. floor1 Y coord. %d \n", floor1_values, floor_setup->data.t1.x_list[floor1_values]);
511                 }
512             }
513
514 // Precalculate order of x coordinates - needed for decode
515
516             for(k=0;k<floor_setup->data.t1.x_list_dim;++k) {
517                 floor_setup->data.t1.x_list_order[k]=k;
518             }
519
520             for(k=0;k<floor_setup->data.t1.x_list_dim-1;++k) {   // FIXME optimize sorting ?
521                 for(j=k+1;j<floor_setup->data.t1.x_list_dim;++j) {
522                     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]]) {
523                         uint_fast16_t tmp=floor_setup->data.t1.x_list_order[k];
524                         floor_setup->data.t1.x_list_order[k]=floor_setup->data.t1.x_list_order[j];
525                         floor_setup->data.t1.x_list_order[j]=tmp;
526                     }
527                 }
528             }
529
530 // Precalculate low and high neighbours
531
532             for(k=2;k<floor_setup->data.t1.x_list_dim;++k) {
533                 floor_setup->data.t1.low_neighbour[k]=0;
534                 floor_setup->data.t1.high_neighbour[k]=1;  // correct according to SPEC requirements
535
536                 for (j=0;j<k;++j) {
537                     if ((floor_setup->data.t1.x_list[j]<floor_setup->data.t1.x_list[k]) &&
538                       (floor_setup->data.t1.x_list[j]>floor_setup->data.t1.x_list[floor_setup->data.t1.low_neighbour[k]])) {
539                         floor_setup->data.t1.low_neighbour[k]=j;
540                     }
541                     if ((floor_setup->data.t1.x_list[j]>floor_setup->data.t1.x_list[k]) &&
542                       (floor_setup->data.t1.x_list[j]<floor_setup->data.t1.x_list[floor_setup->data.t1.high_neighbour[k]])) {
543                         floor_setup->data.t1.high_neighbour[k]=j;
544                     }
545                 }
546             }
547         }
548         else if(floor_setup->floor_type==0) {
549             uint_fast8_t max_codebook_dim=0;
550
551             floor_setup->decode=vorbis_floor0_decode;
552
553             floor_setup->data.t0.order=get_bits(gb, 8);
554             floor_setup->data.t0.rate=get_bits(gb, 16);
555             floor_setup->data.t0.bark_map_size=get_bits(gb, 16);
556             floor_setup->data.t0.amplitude_bits=get_bits(gb, 6);
557             /* zero would result in a div by zero later *
558              * 2^0 - 1 == 0                             */
559             if (floor_setup->data.t0.amplitude_bits == 0) {
560               av_log(vc->avccontext, AV_LOG_ERROR,
561                      "Floor 0 amplitude bits is 0.\n");
562               return 1;
563             }
564             floor_setup->data.t0.amplitude_offset=get_bits(gb, 8);
565             floor_setup->data.t0.num_books=get_bits(gb, 4)+1;
566
567             /* allocate mem for booklist */
568             floor_setup->data.t0.book_list=
569                 av_malloc(floor_setup->data.t0.num_books);
570             if(!floor_setup->data.t0.book_list) { return 1; }
571             /* read book indexes */
572             {
573                 int idx;
574                 uint_fast8_t book_idx;
575                 for (idx=0;idx<floor_setup->data.t0.num_books;++idx) {
576                     book_idx=get_bits(gb, 8);
577                     floor_setup->data.t0.book_list[idx]=book_idx;
578                     if (vc->codebooks[book_idx].dimensions > max_codebook_dim)
579                         max_codebook_dim=vc->codebooks[book_idx].dimensions;
580
581                     if (floor_setup->data.t0.book_list[idx]>vc->codebook_count)
582                         return 1;
583                 }
584             }
585
586             create_map( vc, i );
587
588             /* allocate mem for lsp coefficients */
589             {
590                 /* codebook dim is for padding if codebook dim doesn't *
591                  * divide order+1 then we need to read more data       */
592                 floor_setup->data.t0.lsp=
593                     av_malloc((floor_setup->data.t0.order+1 + max_codebook_dim)
594                               * sizeof(float));
595                 if(!floor_setup->data.t0.lsp) { return 1; }
596             }
597
598 #ifdef V_DEBUG /* debug output parsed headers */
599             AV_DEBUG("floor0 order: %u\n", floor_setup->data.t0.order);
600             AV_DEBUG("floor0 rate: %u\n", floor_setup->data.t0.rate);
601             AV_DEBUG("floor0 bark map size: %u\n",
602               floor_setup->data.t0.bark_map_size);
603             AV_DEBUG("floor0 amplitude bits: %u\n",
604               floor_setup->data.t0.amplitude_bits);
605             AV_DEBUG("floor0 amplitude offset: %u\n",
606               floor_setup->data.t0.amplitude_offset);
607             AV_DEBUG("floor0 number of books: %u\n",
608               floor_setup->data.t0.num_books);
609             AV_DEBUG("floor0 book list pointer: %p\n",
610               floor_setup->data.t0.book_list);
611             {
612               int idx;
613               for (idx=0;idx<floor_setup->data.t0.num_books;++idx) {
614                 AV_DEBUG( "  Book %d: %u\n",
615                   idx+1,
616                   floor_setup->data.t0.book_list[idx] );
617               }
618             }
619 #endif
620         }
621         else {
622             av_log(vc->avccontext, AV_LOG_ERROR, "Invalid floor type!\n");
623             return 1;
624         }
625     }
626     return 0;
627 }
628
629 // Process residues part
630
631 static int vorbis_parse_setup_hdr_residues(vorbis_context *vc){
632     GetBitContext *gb=&vc->gb;
633     uint_fast8_t i, j, k;
634
635     vc->residue_count=get_bits(gb, 6)+1;
636     vc->residues=(vorbis_residue *)av_mallocz(vc->residue_count * sizeof(vorbis_residue));
637
638     AV_DEBUG(" There are %d residues. \n", vc->residue_count);
639
640     for(i=0;i<vc->residue_count;++i) {
641         vorbis_residue *res_setup=&vc->residues[i];
642         uint_fast8_t cascade[64];
643         uint_fast8_t high_bits;
644         uint_fast8_t low_bits;
645
646         res_setup->type=get_bits(gb, 16);
647
648         AV_DEBUG(" %d. residue type %d \n", i, res_setup->type);
649
650         res_setup->begin=get_bits(gb, 24);
651         res_setup->end=get_bits(gb, 24);
652         res_setup->partition_size=get_bits(gb, 24)+1;
653         res_setup->classifications=get_bits(gb, 6)+1;
654         res_setup->classbook=get_bits(gb, 8);
655
656         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,
657           res_setup->classifications, res_setup->classbook);
658
659         for(j=0;j<res_setup->classifications;++j) {
660             high_bits=0;
661             low_bits=get_bits(gb, 3);
662             if (get_bits1(gb)) {
663                 high_bits=get_bits(gb, 5);
664             }
665             cascade[j]=(high_bits<<3)+low_bits;
666
667             AV_DEBUG("     %d class casscade depth: %d \n", j, ilog(cascade[j]));
668         }
669
670         res_setup->maxpass=0;
671         for(j=0;j<res_setup->classifications;++j) {
672             for(k=0;k<8;++k) {
673                 if (cascade[j]&(1<<k)) {
674                         res_setup->books[j][k]=get_bits(gb, 8);
675
676                     AV_DEBUG("     %d class casscade depth %d book: %d \n", j, k, res_setup->books[j][k]);
677
678                     if (k>res_setup->maxpass) {
679                         res_setup->maxpass=k;
680                     }
681                 } else {
682                     res_setup->books[j][k]=-1;
683                 }
684             }
685         }
686     }
687     return 0;
688 }
689
690 // Process mappings part
691
692 static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc) {
693     GetBitContext *gb=&vc->gb;
694     uint_fast8_t i, j;
695
696     vc->mapping_count=get_bits(gb, 6)+1;
697     vc->mappings=(vorbis_mapping *)av_mallocz(vc->mapping_count * sizeof(vorbis_mapping));
698
699     AV_DEBUG(" There are %d mappings. \n", vc->mapping_count);
700
701     for(i=0;i<vc->mapping_count;++i) {
702         vorbis_mapping *mapping_setup=&vc->mappings[i];
703
704         if (get_bits(gb, 16)) {
705             av_log(vc->avccontext, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n");
706             return 1;
707         }
708         if (get_bits1(gb)) {
709             mapping_setup->submaps=get_bits(gb, 4)+1;
710         } else {
711             mapping_setup->submaps=1;
712         }
713
714         if (get_bits1(gb)) {
715             mapping_setup->coupling_steps=get_bits(gb, 8)+1;
716             mapping_setup->magnitude=(uint_fast8_t *)av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
717             mapping_setup->angle=(uint_fast8_t *)av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
718             for(j=0;j<mapping_setup->coupling_steps;++j) {
719                 mapping_setup->magnitude[j]=get_bits(gb, ilog(vc->audio_channels-1));
720                 mapping_setup->angle[j]=get_bits(gb, ilog(vc->audio_channels-1));
721                 // FIXME: sanity checks
722             }
723         } else {
724             mapping_setup->coupling_steps=0;
725         }
726
727         AV_DEBUG("   %d mapping coupling steps: %d \n", i, mapping_setup->coupling_steps);
728
729         if(get_bits(gb, 2)) {
730             av_log(vc->avccontext, AV_LOG_ERROR, "%d. mapping setup data invalid. \n", i);
731             return 1; // following spec.
732         }
733
734         if (mapping_setup->submaps>1) {
735             mapping_setup->mux=(uint_fast8_t *)av_mallocz(vc->audio_channels * sizeof(uint_fast8_t));
736             for(j=0;j<vc->audio_channels;++j) {
737                 mapping_setup->mux[j]=get_bits(gb, 4);
738             }
739         }
740
741         for(j=0;j<mapping_setup->submaps;++j) {
742             get_bits(gb, 8); // FIXME check?
743             mapping_setup->submap_floor[j]=get_bits(gb, 8);
744             mapping_setup->submap_residue[j]=get_bits(gb, 8);
745
746             AV_DEBUG("   %d mapping %d submap : floor %d, residue %d \n", i, j, mapping_setup->submap_floor[j], mapping_setup->submap_residue[j]);
747         }
748     }
749     return 0;
750 }
751
752 // Process modes part
753
754 static void create_map( vorbis_context * vc, uint_fast8_t floor_number )
755 {
756     vorbis_floor * floors=vc->floors;
757     vorbis_floor0 * vf;
758     int idx;
759     int_fast8_t blockflag;
760     int_fast32_t * map;
761     int_fast32_t n; //TODO: could theoretically be smaller?
762
763     for (blockflag=0;blockflag<2;++blockflag)
764     {
765     n=(blockflag ? vc->blocksize_1 : vc->blocksize_0) / 2;
766     floors[floor_number].data.t0.map[blockflag]=
767         av_malloc((n+1) * sizeof(int_fast32_t)); // n+sentinel
768
769     map=floors[floor_number].data.t0.map[blockflag];
770     vf=&floors[floor_number].data.t0;
771
772     for (idx=0; idx<n;++idx) {
773         map[idx]=floor( BARK((vf->rate*idx)/(2.0f*n)) *
774                               ((vf->bark_map_size)/
775                                BARK(vf->rate/2.0f )) );
776         if (vf->bark_map_size-1 < map[idx]) {
777             map[idx]=vf->bark_map_size-1;
778         }
779     }
780     map[n]=-1;
781     vf->map_size[blockflag]=n;
782     }
783
784 #   ifdef V_DEBUG
785     for(idx=0;idx<=n;++idx) {
786         AV_DEBUG("floor0 map: map at pos %d is %d\n",
787                  idx, map[idx]);
788     }
789 #   endif
790 }
791
792 static int vorbis_parse_setup_hdr_modes(vorbis_context *vc) {
793     GetBitContext *gb=&vc->gb;
794     uint_fast8_t i;
795
796     vc->mode_count=get_bits(gb, 6)+1;
797     vc->modes=(vorbis_mode *)av_mallocz(vc->mode_count * sizeof(vorbis_mode));
798
799     AV_DEBUG(" There are %d modes.\n", vc->mode_count);
800
801     for(i=0;i<vc->mode_count;++i) {
802         vorbis_mode *mode_setup=&vc->modes[i];
803
804         mode_setup->blockflag=get_bits(gb, 1);
805         mode_setup->windowtype=get_bits(gb, 16); //FIXME check
806         mode_setup->transformtype=get_bits(gb, 16); //FIXME check
807         mode_setup->mapping=get_bits(gb, 8); //FIXME check
808
809         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);
810     }
811     return 0;
812 }
813
814 // Process the whole setup header using the functions above
815
816 static int vorbis_parse_setup_hdr(vorbis_context *vc) {
817     GetBitContext *gb=&vc->gb;
818
819     if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') ||
820     (get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') ||
821     (get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) {
822         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n");
823         return 1;
824     }
825
826     if (vorbis_parse_setup_hdr_codebooks(vc)) {
827         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n");
828         return 2;
829     }
830     if (vorbis_parse_setup_hdr_tdtransforms(vc)) {
831         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n");
832         return 3;
833     }
834     if (vorbis_parse_setup_hdr_floors(vc)) {
835         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n");
836         return 4;
837     }
838     if (vorbis_parse_setup_hdr_residues(vc)) {
839         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n");
840         return 5;
841     }
842     if (vorbis_parse_setup_hdr_mappings(vc)) {
843         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n");
844         return 6;
845     }
846     if (vorbis_parse_setup_hdr_modes(vc)) {
847         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n");
848         return 7;
849     }
850     if (!get_bits1(gb)) {
851         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n");
852         return 8; // framing flag bit unset error
853     }
854
855     return 0;
856 }
857
858 // Process the identification header
859
860 static int vorbis_parse_id_hdr(vorbis_context *vc){
861     GetBitContext *gb=&vc->gb;
862     uint_fast8_t bl0, bl1;
863     const float *vwin[8]={ vwin64, vwin128, vwin256, vwin512, vwin1024, vwin2048, vwin4096, vwin8192 };
864
865     if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') ||
866     (get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') ||
867     (get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) {
868         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n");
869         return 1;
870     }
871
872     vc->version=get_bits_long_le(gb, 32);    //FIXME check 0
873     vc->audio_channels=get_bits(gb, 8);   //FIXME check >0
874     vc->audio_samplerate=get_bits_long_le(gb, 32);   //FIXME check >0
875     vc->bitrate_maximum=get_bits_long_le(gb, 32);
876     vc->bitrate_nominal=get_bits_long_le(gb, 32);
877     vc->bitrate_minimum=get_bits_long_le(gb, 32);
878     bl0=get_bits(gb, 4);
879     bl1=get_bits(gb, 4);
880     vc->blocksize_0=(1<<bl0);
881     vc->blocksize_1=(1<<bl1);
882     if (bl0>13 || bl0<6 || bl1>13 || bl1<6 || bl1<bl0) {
883         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n");
884         return 3;
885     }
886     // output format int16
887     if (vc->blocksize_1/2 * vc->audio_channels * 2 >
888                                              AVCODEC_MAX_AUDIO_FRAME_SIZE) {
889         av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis channel count makes "
890                "output packets too large.\n");
891         return 4;
892     }
893     vc->swin=vwin[bl0-6];
894     vc->lwin=vwin[bl1-6];
895
896     if(vc->exp_bias){
897         int i;
898         float *win;
899         win = av_malloc(vc->blocksize_0/2 * sizeof(float));
900         for(i=0; i<vc->blocksize_0/2; i++)
901             win[i] = vc->swin[i] * (1<<15);
902         vc->swin = win;
903         win = av_malloc(vc->blocksize_1/2 * sizeof(float));
904         for(i=0; i<vc->blocksize_1/2; i++)
905             win[i] = vc->lwin[i] * (1<<15);
906         vc->lwin = win;
907     }
908
909     if ((get_bits1(gb)) == 0) {
910         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n");
911         return 2;
912     }
913
914     vc->channel_residues=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
915     vc->channel_floors=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
916     vc->saved=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
917     vc->ret=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
918     vc->buf=(float *)av_malloc(vc->blocksize_1 * sizeof(float));
919     vc->buf_tmp=(float *)av_malloc(vc->blocksize_1 * sizeof(float));
920     vc->saved_start=0;
921
922     ff_mdct_init(&vc->mdct0, bl0, 1);
923     ff_mdct_init(&vc->mdct1, bl1, 1);
924
925     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 ",
926             vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize_0, vc->blocksize_1);
927
928 /*
929     BLK=vc->blocksize_0;
930     for(i=0;i<BLK/2;++i) {
931         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)));
932     }
933 */
934
935     return 0;
936 }
937
938 // Process the extradata using the functions above (identification header, setup header)
939
940 static int vorbis_decode_init(AVCodecContext *avccontext) {
941     vorbis_context *vc = avccontext->priv_data ;
942     uint8_t *headers = avccontext->extradata;
943     int headers_len=avccontext->extradata_size;
944     uint8_t *header_start[3];
945     int header_len[3];
946     GetBitContext *gb = &(vc->gb);
947     int i, j, hdr_type;
948
949     vc->avccontext = avccontext;
950     dsputil_init(&vc->dsp, avccontext);
951
952     if(vc->dsp.float_to_int16 == ff_float_to_int16_c) {
953         vc->add_bias = 385;
954         vc->exp_bias = 0;
955     } else {
956         vc->add_bias = 0;
957         vc->exp_bias = 15<<23;
958     }
959
960     if (!headers_len) {
961         av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
962         return -1;
963     }
964
965     if(headers[0] == 0 && headers[1] == 30) {
966         for(i = 0; i < 3; i++){
967             header_len[i] = *headers++ << 8;
968             header_len[i] += *headers++;
969             header_start[i] = headers;
970             headers += header_len[i];
971         }
972     } else if(headers[0] == 2) {
973         for(j=1,i=0;i<2;++i, ++j) {
974             header_len[i]=0;
975             while(j<headers_len && headers[j]==0xff) {
976                 header_len[i]+=0xff;
977                 ++j;
978             }
979             if (j>=headers_len) {
980                 av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
981                 return -1;
982             }
983             header_len[i]+=headers[j];
984         }
985         header_len[2]=headers_len-header_len[0]-header_len[1]-j;
986         headers+=j;
987         header_start[0] = headers;
988         header_start[1] = header_start[0] + header_len[0];
989         header_start[2] = header_start[1] + header_len[1];
990     } else {
991         av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
992         return -1;
993     }
994
995     init_get_bits(gb, header_start[0], header_len[0]*8);
996     hdr_type=get_bits(gb, 8);
997     if (hdr_type!=1) {
998         av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n");
999         return -1;
1000     }
1001     if (vorbis_parse_id_hdr(vc)) {
1002         av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n");
1003         vorbis_free(vc);
1004         return -1;
1005     }
1006
1007     init_get_bits(gb, header_start[2], header_len[2]*8);
1008     hdr_type=get_bits(gb, 8);
1009     if (hdr_type!=5) {
1010         av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");
1011         return -1;
1012     }
1013     if (vorbis_parse_setup_hdr(vc)) {
1014         av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");
1015         vorbis_free(vc);
1016         return -1;
1017     }
1018
1019     avccontext->channels = vc->audio_channels;
1020     avccontext->sample_rate = vc->audio_samplerate;
1021
1022     return 0 ;
1023 }
1024
1025 // Decode audiopackets -------------------------------------------------
1026
1027 // Read and decode floor
1028
1029 static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,
1030                                          vorbis_floor_data *vfu, float *vec) {
1031     vorbis_floor0 * vf=&vfu->t0;
1032     float * lsp=vf->lsp;
1033     uint_fast32_t amplitude;
1034     uint_fast32_t book_idx;
1035     uint_fast8_t blockflag=vc->modes[vc->mode_number].blockflag;
1036
1037     amplitude=get_bits(&vc->gb, vf->amplitude_bits);
1038     if (amplitude>0) {
1039         float last = 0;
1040         uint_fast16_t lsp_len = 0;
1041         uint_fast16_t idx;
1042         vorbis_codebook codebook;
1043
1044         book_idx=get_bits(&vc->gb, ilog(vf->num_books));
1045         if ( book_idx >= vf->num_books ) {
1046             av_log( vc->avccontext, AV_LOG_ERROR,
1047                     "floor0 dec: booknumber too high!\n" );
1048             //FIXME: look above
1049         }
1050         AV_DEBUG( "floor0 dec: booknumber: %u\n", book_idx );
1051         codebook=vc->codebooks[vf->book_list[book_idx]];
1052
1053         while (lsp_len<vf->order) {
1054             int vec_off;
1055
1056             AV_DEBUG( "floor0 dec: book dimension: %d\n", codebook.dimensions );
1057             AV_DEBUG( "floor0 dec: maximum depth: %d\n", codebook.maxdepth );
1058             /* read temp vector */
1059             vec_off=get_vlc2(&vc->gb,
1060                              codebook.vlc.table,
1061                              codebook.nb_bits,
1062                              codebook.maxdepth ) *
1063                              codebook.dimensions;
1064             AV_DEBUG( "floor0 dec: vector offset: %d\n", vec_off );
1065             /* copy each vector component and add last to it */
1066             for (idx=0; idx<codebook.dimensions; ++idx) {
1067                 lsp[lsp_len+idx]=codebook.codevectors[vec_off+idx]+last;
1068             }
1069             last=lsp[lsp_len+idx-1]; /* set last to last vector component */
1070
1071             lsp_len += codebook.dimensions;
1072         }
1073 #ifdef V_DEBUG
1074         /* DEBUG: output lsp coeffs */
1075         {
1076             int idx;
1077             for ( idx = 0; idx < lsp_len; ++idx )
1078                 AV_DEBUG("floor0 dec: coeff at %d is %f\n", idx, lsp[idx] );
1079         }
1080 #endif
1081
1082         /* synthesize floor output vector */
1083         {
1084             int i;
1085             int order=vf->order;
1086             float wstep=M_PI/vf->bark_map_size;
1087
1088             for(i=0;i<order;i++) { lsp[i]=2.0f*cos(lsp[i]); }
1089
1090             AV_DEBUG("floor0 synth: map_size=%d; m=%d; wstep=%f\n",
1091                      vf->map_size, order, wstep);
1092
1093             i=0;
1094             while(i<vf->map_size[blockflag]) {
1095                 int j, iter_cond=vf->map[blockflag][i];
1096                 float p=0.5f;
1097                 float q=0.5f;
1098                 float two_cos_w=2.0f*cos(wstep*iter_cond); // needed all times
1099
1100                 /* similar part for the q and p products */
1101                 for(j=0;j<order;j+=2) {
1102                     q *= lsp[j]  -two_cos_w;
1103                     p *= lsp[j+1]-two_cos_w;
1104                 }
1105                 if(j==order) { // even order
1106                     p *= p*(2.0f-two_cos_w);
1107                     q *= q*(2.0f+two_cos_w);
1108                 }
1109                 else { // odd order
1110                     q *= two_cos_w-lsp[j]; // one more time for q
1111
1112                     /* final step and square */
1113                     p *= p*(4.f-two_cos_w*two_cos_w);
1114                     q *= q;
1115                 }
1116
1117                 /* calculate linear floor value */
1118                 {
1119                     q=exp( (
1120                              ( (amplitude*vf->amplitude_offset)/
1121                                (((1<<vf->amplitude_bits)-1) * sqrt(p+q)) )
1122                              - vf->amplitude_offset ) * .11512925f
1123                          );
1124                 }
1125
1126                 /* fill vector */
1127                 do { vec[i]=q; ++i; }while(vf->map[blockflag][i]==iter_cond);
1128             }
1129         }
1130     }
1131     else {
1132         /* this channel is unused */
1133         return 1;
1134     }
1135
1136     AV_DEBUG(" Floor0 decoded\n");
1137
1138     return 0;
1139 }
1140 static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc, vorbis_floor_data *vfu, float *vec) {
1141     vorbis_floor1 * vf=&vfu->t1;
1142     GetBitContext *gb=&vc->gb;
1143     uint_fast16_t range_v[4]={ 256, 128, 86, 64 };
1144     uint_fast16_t range=range_v[vf->multiplier-1];
1145     uint_fast16_t floor1_Y[vf->x_list_dim];
1146     uint_fast16_t floor1_Y_final[vf->x_list_dim];
1147     uint_fast8_t floor1_flag[vf->x_list_dim];
1148     uint_fast8_t class_;
1149     uint_fast8_t cdim;
1150     uint_fast8_t cbits;
1151     uint_fast8_t csub;
1152     uint_fast8_t cval;
1153     int_fast16_t book;
1154     uint_fast16_t offset;
1155     uint_fast16_t i,j;
1156     uint_fast16_t *floor_x_sort=vf->x_list_order;
1157     /*u*/int_fast16_t adx, ady, off, predicted; // WTF ? dy/adx= (unsigned)dy/adx ?
1158     int_fast16_t dy, err;
1159     uint_fast16_t lx,hx, ly, hy=0;
1160
1161
1162     if (!get_bits1(gb)) return 1; // silence
1163
1164 // Read values (or differences) for the floor's points
1165
1166     floor1_Y[0]=get_bits(gb, ilog(range-1));
1167     floor1_Y[1]=get_bits(gb, ilog(range-1));
1168
1169     AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);
1170
1171     offset=2;
1172     for(i=0;i<vf->partitions;++i) {
1173         class_=vf->partition_class[i];
1174         cdim=vf->class_dimensions[class_];
1175         cbits=vf->class_subclasses[class_];
1176         csub=(1<<cbits)-1;
1177         cval=0;
1178
1179         AV_DEBUG("Cbits %d \n", cbits);
1180
1181         if (cbits) { // this reads all subclasses for this partition's class
1182             cval=get_vlc2(gb, vc->codebooks[vf->class_masterbook[class_]].vlc.table,
1183             vc->codebooks[vf->class_masterbook[class_]].nb_bits, 3);
1184         }
1185
1186         for(j=0;j<cdim;++j) {
1187             book=vf->subclass_books[class_][cval & csub];
1188
1189             AV_DEBUG("book %d Cbits %d cval %d  bits:%d \n", book, cbits, cval, get_bits_count(gb));
1190
1191             cval=cval>>cbits;
1192             if (book>0) {
1193                 floor1_Y[offset+j]=get_vlc2(gb, vc->codebooks[book].vlc.table,
1194                 vc->codebooks[book].nb_bits, 3);
1195             } else {
1196                 floor1_Y[offset+j]=0;
1197             }
1198
1199             AV_DEBUG(" floor(%d) = %d \n", vf->x_list[offset+j], floor1_Y[offset+j]);
1200         }
1201         offset+=cdim;
1202     }
1203
1204 // Amplitude calculation from the differences
1205
1206     floor1_flag[0]=1;
1207     floor1_flag[1]=1;
1208     floor1_Y_final[0]=floor1_Y[0];
1209     floor1_Y_final[1]=floor1_Y[1];
1210
1211     for(i=2;i<vf->x_list_dim;++i) {
1212         uint_fast16_t val, highroom, lowroom, room;
1213         uint_fast16_t high_neigh_offs;
1214         uint_fast16_t low_neigh_offs;
1215
1216         low_neigh_offs=vf->low_neighbour[i];
1217         high_neigh_offs=vf->high_neighbour[i];
1218         dy=floor1_Y_final[high_neigh_offs]-floor1_Y_final[low_neigh_offs];  // render_point begin
1219         adx=vf->x_list[high_neigh_offs]-vf->x_list[low_neigh_offs];
1220         ady= ABS(dy);
1221         err=ady*(vf->x_list[i]-vf->x_list[low_neigh_offs]);
1222         off=(int16_t)err/(int16_t)adx;
1223         if (dy<0) {
1224             predicted=floor1_Y_final[low_neigh_offs]-off;
1225         } else {
1226             predicted=floor1_Y_final[low_neigh_offs]+off;
1227         } // render_point end
1228
1229         val=floor1_Y[i];
1230         highroom=range-predicted;
1231         lowroom=predicted;
1232         if (highroom < lowroom) {
1233             room=highroom*2;
1234         } else {
1235             room=lowroom*2;   // SPEC mispelling
1236         }
1237         if (val) {
1238             floor1_flag[low_neigh_offs]=1;
1239             floor1_flag[high_neigh_offs]=1;
1240             floor1_flag[i]=1;
1241             if (val>=room) {
1242                 if (highroom > lowroom) {
1243                     floor1_Y_final[i]=val-lowroom+predicted;
1244                 } else {
1245                     floor1_Y_final[i]=predicted-val+highroom-1;
1246                 }
1247             } else {
1248                 if (val & 1) {
1249                     floor1_Y_final[i]=predicted-(val+1)/2;
1250                 } else {
1251                     floor1_Y_final[i]=predicted+val/2;
1252                 }
1253             }
1254         } else {
1255             floor1_flag[i]=0;
1256             floor1_Y_final[i]=predicted;
1257         }
1258
1259         AV_DEBUG(" Decoded floor(%d) = %d / val %d \n", vf->x_list[i], floor1_Y_final[i], val);
1260     }
1261
1262 // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?
1263
1264     hx=0;
1265     lx=0;
1266     ly=floor1_Y_final[0]*vf->multiplier;  // conforms to SPEC
1267
1268     vec[0]=floor1_inverse_db_table[ly];
1269
1270     for(i=1;i<vf->x_list_dim;++i) {
1271         AV_DEBUG(" Looking at post %d \n", i);
1272
1273         if (floor1_flag[floor_x_sort[i]]) {   // SPEC mispelled
1274             int_fast16_t x, y, dy, base, sy; // if uncommented: dy = -32 adx = 2  base = 2blablabla ?????
1275
1276             hy=floor1_Y_final[floor_x_sort[i]]*vf->multiplier;
1277             hx=vf->x_list[floor_x_sort[i]];
1278
1279             dy=hy-ly;
1280             adx=hx-lx;
1281             ady= (dy<0) ? -dy:dy;//ABS(dy);
1282             base=(int16_t)dy/(int16_t)adx;
1283
1284             AV_DEBUG(" dy %d  adx %d base %d = %d \n", dy, adx, base, dy/adx);
1285
1286             x=lx;
1287             y=ly;
1288             err=0;
1289             if (dy<0) {
1290                 sy=base-1;
1291             } else {
1292                 sy=base+1;
1293             }
1294             ady=ady-(base<0 ? -base : base)*adx;
1295             vec[x]=floor1_inverse_db_table[y];
1296
1297             AV_DEBUG(" vec[ %d ] = %d \n", x, y);
1298
1299             for(x=lx+1;(x<hx) && (x<vf->x_list[1]);++x) {
1300                 err+=ady;
1301                 if (err>=adx) {
1302                     err-=adx;
1303                     y+=sy;
1304                 } else {
1305                     y+=base;
1306                 }
1307                 vec[x]=floor1_inverse_db_table[y];
1308
1309                 AV_DEBUG(" vec[ %d ] = %d \n", x, y);
1310             }
1311
1312 /*            for(j=1;j<hx-lx+1;++j) {  // iterating render_point
1313                 dy=hy-ly;
1314                 adx=hx-lx;
1315                 ady= dy<0 ? -dy : dy;
1316                 err=ady*j;
1317                 off=err/adx;
1318                 if (dy<0) {
1319                     predicted=ly-off;
1320                 } else {
1321                     predicted=ly+off;
1322                 }
1323                 if (lx+j < vf->x_list[1]) {
1324                     vec[lx+j]=floor1_inverse_db_table[predicted];
1325                 }
1326             }*/
1327
1328             lx=hx;
1329             ly=hy;
1330         }
1331     }
1332
1333     if (hx<vf->x_list[1]) {
1334         for(i=hx;i<vf->x_list[1];++i) {
1335             vec[i]=floor1_inverse_db_table[hy];
1336         }
1337     }
1338
1339     AV_DEBUG(" Floor decoded\n");
1340
1341     return 0;
1342 }
1343
1344 // Read and decode residue
1345
1346 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) {
1347     GetBitContext *gb=&vc->gb;
1348     uint_fast8_t c_p_c=vc->codebooks[vr->classbook].dimensions;
1349     uint_fast16_t n_to_read=vr->end-vr->begin;
1350     uint_fast16_t ptns_to_read=n_to_read/vr->partition_size;
1351     uint_fast8_t classifs[ptns_to_read*vc->audio_channels];
1352     uint_fast8_t pass;
1353     uint_fast8_t ch_used;
1354     uint_fast8_t i,j,l;
1355     uint_fast16_t k;
1356
1357     if (vr->type==2) {
1358         for(j=1;j<ch;++j) {
1359                 do_not_decode[0]&=do_not_decode[j];  // FIXME - clobbering input
1360         }
1361         if (do_not_decode[0]) return 0;
1362         ch_used=1;
1363     } else {
1364         ch_used=ch;
1365     }
1366
1367     AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);
1368
1369     for(pass=0;pass<=vr->maxpass;++pass) { // FIXME OPTIMIZE?
1370         uint_fast16_t voffset;
1371         uint_fast16_t partition_count;
1372         uint_fast16_t j_times_ptns_to_read;
1373
1374         voffset=vr->begin;
1375         for(partition_count=0;partition_count<ptns_to_read;) {  // SPEC        error
1376             if (!pass) {
1377                 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {
1378                     if (!do_not_decode[j]) {
1379                         uint_fast32_t temp=get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,
1380                         vc->codebooks[vr->classbook].nb_bits, 3);
1381
1382                         AV_DEBUG("Classword: %d \n", temp);
1383
1384                         assert(vr->classifications > 1 && temp<=65536); //needed for inverse[]
1385                         for(i=0;i<c_p_c;++i) {
1386                             uint_fast32_t temp2;
1387
1388                             temp2=(((uint_fast64_t)temp) * inverse[vr->classifications])>>32;
1389                             if (partition_count+c_p_c-1-i < ptns_to_read) {
1390                                 classifs[j_times_ptns_to_read+partition_count+c_p_c-1-i]=temp-temp2*vr->classifications;
1391                             }
1392                             temp=temp2;
1393                         }
1394                     }
1395                     j_times_ptns_to_read+=ptns_to_read;
1396                 }
1397             }
1398             for(i=0;(i<c_p_c) && (partition_count<ptns_to_read);++i) {
1399                 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {
1400                     uint_fast16_t voffs;
1401
1402                     if (!do_not_decode[j]) {
1403                         uint_fast8_t vqclass=classifs[j_times_ptns_to_read+partition_count];
1404                         int_fast16_t vqbook=vr->books[vqclass][pass];
1405
1406                         if (vqbook>=0) {
1407                             uint_fast16_t coffs;
1408                             uint_fast8_t dim= vc->codebooks[vqbook].dimensions;
1409                             uint_fast16_t step= dim==1 ? vr->partition_size
1410                                               : FASTDIV(vr->partition_size, dim);
1411                             vorbis_codebook codebook= vc->codebooks[vqbook];
1412
1413                             if (vr->type==0) {
1414
1415                                 voffs=voffset+j*vlen;
1416                                 for(k=0;k<step;++k) {
1417                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * codebook.dimensions;
1418                                     for(l=0;l<codebook.dimensions;++l) {
1419                                         vec[voffs+k+l*step]+=codebook.codevectors[coffs+l];  // FPMATH
1420                                     }
1421                                 }
1422                             }
1423                             else if (vr->type==1) {
1424                                 voffs=voffset+j*vlen;
1425                                 for(k=0;k<step;++k) {
1426                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * codebook.dimensions;
1427                                     for(l=0;l<codebook.dimensions;++l, ++voffs) {
1428                                         vec[voffs]+=codebook.codevectors[coffs+l];  // FPMATH
1429
1430                                         AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d  \n", pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);
1431                                     }
1432                                 }
1433                             }
1434                             else if (vr->type==2 && ch==2 && (voffset&1)==0 && (codebook.dimensions&1)==0) { // most frequent case optimized
1435                                 voffs=voffset>>1;
1436
1437                                 for(k=0;k<step;++k) {
1438                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * codebook.dimensions;
1439                                     for(l=0;l<codebook.dimensions;l+=2, voffs++) {
1440                                         vec[voffs     ]+=codebook.codevectors[coffs+l  ];  // FPMATH
1441                                         vec[voffs+vlen]+=codebook.codevectors[coffs+l+1];  // FPMATH
1442
1443                                         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);
1444                                     }
1445                                 }
1446
1447                             }
1448                             else if (vr->type==2) {
1449                                 voffs=voffset;
1450
1451                                 for(k=0;k<step;++k) {
1452                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * codebook.dimensions;
1453                                     for(l=0;l<codebook.dimensions;++l, ++voffs) {
1454                                         vec[voffs/ch+(voffs%ch)*vlen]+=codebook.codevectors[coffs+l];  // FPMATH FIXME use if and counter instead of / and %
1455
1456                                         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);
1457                                     }
1458                                 }
1459                             } else {
1460                                 av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");
1461                                 return 1;
1462                             }
1463                         }
1464                     }
1465                     j_times_ptns_to_read+=ptns_to_read;
1466                 }
1467                 ++partition_count;
1468                 voffset+=vr->partition_size;
1469             }
1470         }
1471     }
1472     return 0;
1473 }
1474
1475 void vorbis_inverse_coupling(float *mag, float *ang, int blocksize)
1476 {
1477     int i;
1478     for(i=0; i<blocksize; i++)
1479     {
1480         if (mag[i]>0.0) {
1481             if (ang[i]>0.0) {
1482                 ang[i]=mag[i]-ang[i];
1483             } else {
1484                 float temp=ang[i];
1485                 ang[i]=mag[i];
1486                 mag[i]+=temp;
1487             }
1488         } else {
1489             if (ang[i]>0.0) {
1490                 ang[i]+=mag[i];
1491             } else {
1492                 float temp=ang[i];
1493                 ang[i]=mag[i];
1494                 mag[i]-=temp;
1495             }
1496         }
1497     }
1498 }
1499
1500 // Decode the audio packet using the functions above
1501
1502 static int vorbis_parse_audio_packet(vorbis_context *vc) {
1503     GetBitContext *gb=&vc->gb;
1504
1505     uint_fast8_t previous_window=0,next_window=0;
1506     uint_fast8_t mode_number;
1507     uint_fast16_t blocksize;
1508     int_fast32_t i,j;
1509     uint_fast8_t no_residue[vc->audio_channels];
1510     uint_fast8_t do_not_decode[vc->audio_channels];
1511     vorbis_mapping *mapping;
1512     float *ch_res_ptr=vc->channel_residues;
1513     float *ch_floor_ptr=vc->channel_floors;
1514     uint_fast8_t res_chan[vc->audio_channels];
1515     uint_fast8_t res_num=0;
1516     int_fast16_t retlen=0;
1517     uint_fast16_t saved_start=0;
1518     float fadd_bias = vc->add_bias;
1519
1520     if (get_bits1(gb)) {
1521         av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");
1522         return -1; // packet type not audio
1523     }
1524
1525     if (vc->mode_count==1) {
1526         mode_number=0;
1527     } else {
1528         mode_number=get_bits(gb, ilog(vc->mode_count-1));
1529     }
1530     vc->mode_number=mode_number;
1531     mapping=&vc->mappings[vc->modes[mode_number].mapping];
1532
1533     AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);
1534
1535     if (vc->modes[mode_number].blockflag) {
1536         previous_window=get_bits1(gb);
1537         next_window=get_bits1(gb);
1538     }
1539
1540     blocksize=vc->modes[mode_number].blockflag ? vc->blocksize_1 : vc->blocksize_0;
1541     memset(ch_res_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?
1542     memset(ch_floor_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?
1543
1544 // Decode floor
1545
1546     for(i=0;i<vc->audio_channels;++i) {
1547         vorbis_floor *floor;
1548         if (mapping->submaps>1) {
1549             floor=&vc->floors[mapping->submap_floor[mapping->mux[i]]];
1550         } else {
1551             floor=&vc->floors[mapping->submap_floor[0]];
1552         }
1553
1554         no_residue[i]=floor->decode(vc, &floor->data, ch_floor_ptr);
1555         ch_floor_ptr+=blocksize/2;
1556     }
1557
1558 // Nonzero vector propagate
1559
1560     for(i=mapping->coupling_steps-1;i>=0;--i) {
1561         if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {
1562             no_residue[mapping->magnitude[i]]=0;
1563             no_residue[mapping->angle[i]]=0;
1564         }
1565     }
1566
1567 // Decode residue
1568
1569     for(i=0;i<mapping->submaps;++i) {
1570         vorbis_residue *residue;
1571         uint_fast8_t ch=0;
1572
1573         for(j=0;j<vc->audio_channels;++j) {
1574             if ((mapping->submaps==1) || (i=mapping->mux[j])) {
1575                 res_chan[j]=res_num;
1576                 if (no_residue[j]) {
1577                     do_not_decode[ch]=1;
1578                 } else {
1579                     do_not_decode[ch]=0;
1580                 }
1581                 ++ch;
1582                 ++res_num;
1583             }
1584         }
1585         residue=&vc->residues[mapping->submap_residue[i]];
1586         vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);
1587
1588         ch_res_ptr+=ch*blocksize/2;
1589     }
1590
1591 // Inverse coupling
1592
1593     for(i=mapping->coupling_steps-1;i>=0;--i) { //warning: i has to be signed
1594         float *mag, *ang;
1595
1596         mag=vc->channel_residues+res_chan[mapping->magnitude[i]]*blocksize/2;
1597         ang=vc->channel_residues+res_chan[mapping->angle[i]]*blocksize/2;
1598         vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize/2);
1599     }
1600
1601 // Dotproduct
1602
1603     for(j=0, ch_floor_ptr=vc->channel_floors;j<vc->audio_channels;++j,ch_floor_ptr+=blocksize/2) {
1604         ch_res_ptr=vc->channel_residues+res_chan[j]*blocksize/2;
1605         vc->dsp.vector_fmul(ch_floor_ptr, ch_res_ptr, blocksize/2);
1606     }
1607
1608 // MDCT, overlap/add, save data for next overlapping  FPMATH
1609
1610     for(j=0;j<vc->audio_channels;++j) {
1611         uint_fast8_t step=vc->audio_channels;
1612         uint_fast16_t k;
1613         float *saved=vc->saved+j*vc->blocksize_1/2;
1614         float *ret=vc->ret;
1615         const float *lwin=vc->lwin;
1616         const float *swin=vc->swin;
1617         float *buf=vc->buf;
1618         float *buf_tmp=vc->buf_tmp;
1619
1620         ch_floor_ptr=vc->channel_floors+j*blocksize/2;
1621
1622         saved_start=vc->saved_start;
1623
1624         vc->mdct0.fft.imdct_calc(vc->modes[mode_number].blockflag ? &vc->mdct1 : &vc->mdct0, buf, ch_floor_ptr, buf_tmp);
1625
1626         //FIXME process channels together, to allow faster simd vector_fmul_add_add?
1627         if (vc->modes[mode_number].blockflag) {
1628             // -- overlap/add
1629             if (previous_window) {
1630                 vc->dsp.vector_fmul_add_add(ret+j, buf, lwin, saved, vc->add_bias, vc->blocksize_1/2, step);
1631                 retlen=vc->blocksize_1/2;
1632             } else {
1633                 int len = (vc->blocksize_1-vc->blocksize_0)/4;
1634                 buf += len;
1635                 vc->dsp.vector_fmul_add_add(ret+j, buf, swin, saved, vc->add_bias, vc->blocksize_0/2, step);
1636                 k = vc->blocksize_0/2*step + j;
1637                 buf += vc->blocksize_0/2;
1638                 if(vc->exp_bias){
1639                     for(i=0; i<len; i++, k+=step)
1640                         ((uint32_t*)ret)[k] = ((uint32_t*)buf)[i] + vc->exp_bias; // ret[k]=buf[i]*(1<<bias)
1641                 } else {
1642                     for(i=0; i<len; i++, k+=step)
1643                         ret[k] = buf[i] + fadd_bias;
1644                 }
1645                 buf=vc->buf;
1646                 retlen=vc->blocksize_0/2+len;
1647             }
1648             // -- save
1649             if (next_window) {
1650                 buf += vc->blocksize_1/2;
1651                 vc->dsp.vector_fmul_reverse(saved, buf, lwin, vc->blocksize_1/2);
1652                 saved_start=0;
1653             } else {
1654                 saved_start=(vc->blocksize_1-vc->blocksize_0)/4;
1655                 buf += vc->blocksize_1/2;
1656                 for(i=0; i<saved_start; i++)
1657                     ((uint32_t*)saved)[i] = ((uint32_t*)buf)[i] + vc->exp_bias;
1658                 vc->dsp.vector_fmul_reverse(saved+saved_start, buf+saved_start, swin, vc->blocksize_0/2);
1659             }
1660         } else {
1661             // --overlap/add
1662             if(vc->add_bias) {
1663                 for(k=j, i=0;i<saved_start;++i, k+=step)
1664                     ret[k] = saved[i] + fadd_bias;
1665             } else {
1666                 for(k=j, i=0;i<saved_start;++i, k+=step)
1667                     ret[k] = saved[i];
1668             }
1669             vc->dsp.vector_fmul_add_add(ret+k, buf, swin, saved+saved_start, vc->add_bias, vc->blocksize_0/2, step);
1670             retlen=saved_start+vc->blocksize_0/2;
1671             // -- save
1672             buf += vc->blocksize_0/2;
1673             vc->dsp.vector_fmul_reverse(saved, buf, swin, vc->blocksize_0/2);
1674             saved_start=0;
1675         }
1676     }
1677     vc->saved_start=saved_start;
1678
1679     return retlen*vc->audio_channels;
1680 }
1681
1682 // Return the decoded audio packet through the standard api
1683
1684 static int vorbis_decode_frame(AVCodecContext *avccontext,
1685                         void *data, int *data_size,
1686                         uint8_t *buf, int buf_size)
1687 {
1688     vorbis_context *vc = avccontext->priv_data ;
1689     GetBitContext *gb = &(vc->gb);
1690
1691     int_fast16_t i, len;
1692
1693     if(!buf_size){
1694         return 0;
1695     }
1696
1697     AV_DEBUG("packet length %d \n", buf_size);
1698
1699     init_get_bits(gb, buf, buf_size*8);
1700
1701     len=vorbis_parse_audio_packet(vc);
1702
1703     if (len<=0) {
1704         *data_size=0;
1705         return buf_size;
1706     }
1707
1708     if (!vc->first_frame) {
1709         vc->first_frame=1;
1710         *data_size=0;
1711         return buf_size ;
1712     }
1713
1714     AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);
1715
1716     vc->dsp.float_to_int16(data, vc->ret, len);
1717     *data_size=len*2;
1718
1719     return buf_size ;
1720 }
1721
1722 // Close decoder
1723
1724 static int vorbis_decode_close(AVCodecContext *avccontext) {
1725     vorbis_context *vc = avccontext->priv_data;
1726
1727     vorbis_free(vc);
1728
1729     return 0 ;
1730 }
1731
1732 AVCodec vorbis_decoder = {
1733     "vorbis",
1734     CODEC_TYPE_AUDIO,
1735     CODEC_ID_VORBIS,
1736     sizeof(vorbis_context),
1737     vorbis_decode_init,
1738     NULL,
1739     vorbis_decode_close,
1740     vorbis_decode_frame,
1741 };
1742