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r955: Fix the Diffkey icon.
[cinelerra_cv.git] / quicktime / ffmpeg / libavcodec / vorbis.c
blob3cc81520aecd8af5a9ef8465a7d72414b7f896cd
1 /**
2 * @file vorbis.c
3 * Vorbis I decoder
4 * @author Denes Balatoni ( dbalatoni programozo hu )
5
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22 #undef V_DEBUG
23
24 #include <math.h>
25
26 #define ALT_BITSTREAM_READER_LE
27 #include "avcodec.h"
28 #include "bitstream.h"
29 #include "dsputil.h"
30
31 #include "vorbis.h"
32
33 #define V_NB_BITS 8
34 #define V_NB_BITS2 11
35 #define V_MAX_VLCS (1<<16)
36
37 #ifndef V_DEBUG
38 #define AV_DEBUG(...)
39 #endif
40
41 #undef NDEBUG
42 #include <assert.h>
43
44 /* Helper functions */
45
46 /**
47 * reads 0-32 bits when using the ALT_BITSTREAM_READER_LE bitstream reader
48 */
49 unsigned int get_bits_long_le(GetBitContext *s, int n){
50 if(n<=17) return get_bits(s, n);
51 else{
52 int ret= get_bits(s, 16);
53 return ret | (get_bits(s, n-16) << 16);
54 }
55 }
56
57 #define ilog(i) av_log2(2*(i))
58
59 static unsigned int nth_root(unsigned int x, unsigned int n) { // x^(1/n)
60 unsigned int ret=0, i, j;
61
62 do {
63 ++ret;
64 for(i=0,j=ret;i<n-1;i++) j*=ret;
65 } while (j<=x);
66
67 return (ret-1);
68 }
69
70 static float vorbisfloat2float(uint_fast32_t val) {
71 double mant=val&0x1fffff;
72 long exp=(val&0x7fe00000L)>>21;
73 if (val&0x80000000) mant=-mant;
74 return(ldexp(mant, exp-20-768));
75 }
76
77
78 // Generate vlc codes from vorbis huffman code lengths
79
80 static int vorbis_len2vlc(vorbis_context *vc, uint_fast8_t *bits, uint_fast32_t *codes, uint_fast32_t num) {
81 uint_fast32_t exit_at_level[33]={404,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
82 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
83
84 uint_fast8_t i,j;
85 uint_fast32_t code,p;
86
87 #ifdef V_DEBUG
88 GetBitContext gb;
89 #endif
90
91 for(p=0;(bits[p]==0) && (p<num);++p);
92 if (p==num) {
93 // av_log(vc->avccontext, AV_LOG_INFO, "An empty codebook. Heh?! \n");
94 return 0;
95 }
96
97 codes[p]=0;
98 for(i=0;i<bits[p];++i) {
99 exit_at_level[i+1]=1<<i;
100 }
101
102 #ifdef V_DEBUG
103 av_log(vc->avccontext, AV_LOG_INFO, " %d. of %d code len %d code %d - ", p, num, bits[p], codes[p]);
104 init_get_bits(&gb, (uint_fast8_t *)&codes[p], bits[p]);
105 for(i=0;i<bits[p];++i) {
106 av_log(vc->avccontext, AV_LOG_INFO, "%s", get_bits1(&gb) ? "1" : "0");
107 }
108 av_log(vc->avccontext, AV_LOG_INFO, "\n");
109 #endif
110
111 ++p;
112
113 for(;p<num;++p) {
114 if (bits[p]==0) continue;
115 // find corresponding exit(node which the tree can grow further from)
116 for(i=bits[p];i>0;--i) {
117 if (exit_at_level[i]) break;
118 }
119 if (!i) return 1; // overspecified tree
120 code=exit_at_level[i];
121 exit_at_level[i]=0;
122 // construct code (append 0s to end) and introduce new exits
123 for(j=i+1;j<=bits[p];++j) {
124 exit_at_level[j]=code+(1<<(j-1));
125 }
126 codes[p]=code;
127
128 #ifdef V_DEBUG
129 av_log(vc->avccontext, AV_LOG_INFO, " %d. code len %d code %d - ", p, bits[p], codes[p]);
130 init_get_bits(&gb, (uint_fast8_t *)&codes[p], bits[p]);
131 for(i=0;i<bits[p];++i) {
132 av_log(vc->avccontext, AV_LOG_INFO, "%s", get_bits1(&gb) ? "1" : "0");
133 }
134 av_log(vc->avccontext, AV_LOG_INFO, "\n");
135 #endif
136
137 }
138
139 //FIXME no exits should be left (underspecified tree - ie. unused valid vlcs - not allowed by SPEC)
140
141 return 0;
142 }
143
144 // Free all allocated memory -----------------------------------------
145
146 static void vorbis_free(vorbis_context *vc) {
147 int_fast16_t i;
148
149 av_freep(&vc->channel_residues);
150 av_freep(&vc->channel_floors);
151 av_freep(&vc->saved);
152 av_freep(&vc->ret);
153 av_freep(&vc->buf);
154 av_freep(&vc->buf_tmp);
155
156 av_freep(&vc->residues);
157 av_freep(&vc->modes);
158
159 ff_mdct_end(&vc->mdct0);
160 ff_mdct_end(&vc->mdct1);
161
162 for(i=0;i<vc->codebook_count;++i) {
163 av_free(vc->codebooks[i].codevectors);
164 free_vlc(&vc->codebooks[i].vlc);
165 }
166 av_freep(&vc->codebooks);
167
168 for(i=0;i<vc->floor_count;++i) {
169 av_free(vc->floors[i].x_list);
170 av_free(vc->floors[i].x_list_order);
171 av_free(vc->floors[i].low_neighbour);
172 av_free(vc->floors[i].high_neighbour);
173 }
174 av_freep(&vc->floors);
175
176 for(i=0;i<vc->mapping_count;++i) {
177 av_free(vc->mappings[i].magnitude);
178 av_free(vc->mappings[i].angle);
179 av_free(vc->mappings[i].mux);
180 }
181 av_freep(&vc->mappings);
182 }
183
184 // Parse setup header -------------------------------------------------
185
186 // Process codebooks part
187
188 static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc) {
189 uint_fast16_t cb;
190 uint_fast8_t *tmp_vlc_bits;
191 uint_fast32_t *tmp_vlc_codes;
192 GetBitContext *gb=&vc->gb;
193
194 vc->codebook_count=get_bits(gb,8)+1;
195
196 AV_DEBUG(" Codebooks: %d \n", vc->codebook_count);
197
198 vc->codebooks=(vorbis_codebook *)av_mallocz(vc->codebook_count * sizeof(vorbis_codebook));
199 tmp_vlc_bits=(uint_fast8_t *)av_mallocz(V_MAX_VLCS * sizeof(uint_fast8_t));
200 tmp_vlc_codes=(uint_fast32_t *)av_mallocz(V_MAX_VLCS * sizeof(uint_fast32_t));
201
202 for(cb=0;cb<vc->codebook_count;++cb) {
203 vorbis_codebook *codebook_setup=&vc->codebooks[cb];
204 uint_fast8_t ordered;
205 uint_fast32_t t, used_entries=0;
206 uint_fast32_t entries;
207
208 AV_DEBUG(" %d. Codebook \n", cb);
209
210 if (get_bits(gb, 24)!=0x564342) {
211 av_log(vc->avccontext, AV_LOG_ERROR, " %d. Codebook setup data corrupt. \n", cb);
212 goto error;
213 }
214
215 codebook_setup->dimensions=get_bits(gb, 16);
216 if (codebook_setup->dimensions>16) {
217 av_log(vc->avccontext, AV_LOG_ERROR, " %d. Codebook's dimension is too large (%d). \n", cb, codebook_setup->dimensions);
218 goto error;
219 }
220 entries=get_bits(gb, 24);
221 if (entries>V_MAX_VLCS) {
222 av_log(vc->avccontext, AV_LOG_ERROR, " %d. Codebook has too many entries (%d). \n", cb, entries);
223 goto error;
224 }
225
226 ordered=get_bits1(gb);
227
228 AV_DEBUG(" codebook_dimensions %d, codebook_entries %d \n", codebook_setup->dimensions, entries);
229
230 if (!ordered) {
231 uint_fast16_t ce;
232 uint_fast8_t flag;
233 uint_fast8_t sparse=get_bits1(gb);
234
235 AV_DEBUG(" not ordered \n");
236
237 if (sparse) {
238 AV_DEBUG(" sparse \n");
239
240 used_entries=0;
241 for(ce=0;ce<entries;++ce) {
242 flag=get_bits1(gb);
243 if (flag) {
244 tmp_vlc_bits[ce]=get_bits(gb, 5)+1;
245 ++used_entries;
246 }
247 else tmp_vlc_bits[ce]=0;
248 }
249 } else {
250 AV_DEBUG(" not sparse \n");
251
252 used_entries=entries;
253 for(ce=0;ce<entries;++ce) {
254 tmp_vlc_bits[ce]=get_bits(gb, 5)+1;
255 }
256 }
257 } else {
258 uint_fast16_t current_entry=0;
259 uint_fast8_t current_length=get_bits(gb, 5)+1;
260
261 AV_DEBUG(" ordered, current length: %d \n", current_length); //FIXME
262
263 used_entries=entries;
264 for(;current_entry<used_entries;++current_length) {
265 uint_fast16_t i, number;
266
267 AV_DEBUG(" number bits: %d ", ilog(entries - current_entry));
268
269 number=get_bits(gb, ilog(entries - current_entry));
270
271 AV_DEBUG(" number: %d \n", number);
272
273 for(i=current_entry;i<number+current_entry;++i) {
274 if (i<used_entries) tmp_vlc_bits[i]=current_length;
275 }
276
277 current_entry+=number;
278 }
279 if (current_entry>used_entries) {
280 av_log(vc->avccontext, AV_LOG_ERROR, " More codelengths than codes in codebook. \n");
281 goto error;
282 }
283 }
284
285 codebook_setup->lookup_type=get_bits(gb, 4);
286
287 AV_DEBUG(" lookup type: %d : %s \n", codebook_setup->lookup_type, codebook_setup->lookup_type ? "vq" : "no lookup" );
288
289 // If the codebook is used for (inverse) VQ, calculate codevectors.
290
291 if (codebook_setup->lookup_type==1) {
292 uint_fast16_t i, j, k;
293 uint_fast16_t codebook_lookup_values=nth_root(entries, codebook_setup->dimensions);
294 uint_fast16_t codebook_multiplicands[codebook_lookup_values];
295
296 float codebook_minimum_value=vorbisfloat2float(get_bits_long_le(gb, 32));
297 float codebook_delta_value=vorbisfloat2float(get_bits_long_le(gb, 32));
298 uint_fast8_t codebook_value_bits=get_bits(gb, 4)+1;
299 uint_fast8_t codebook_sequence_p=get_bits1(gb);
300
301 AV_DEBUG(" We expect %d numbers for building the codevectors. \n", codebook_lookup_values);
302 AV_DEBUG(" delta %f minmum %f \n", codebook_delta_value, codebook_minimum_value);
303
304 for(i=0;i<codebook_lookup_values;++i) {
305 codebook_multiplicands[i]=get_bits(gb, codebook_value_bits);
306
307 AV_DEBUG(" multiplicands*delta+minmum : %e \n", (float)codebook_multiplicands[i]*codebook_delta_value+codebook_minimum_value);
308 AV_DEBUG(" multiplicand %d \n", codebook_multiplicands[i]);
309 }
310
311 // Weed out unused vlcs and build codevector vector
312 codebook_setup->codevectors=(float *)av_mallocz(used_entries*codebook_setup->dimensions * sizeof(float));
313 for(j=0, i=0;i<entries;++i) {
314 uint_fast8_t dim=codebook_setup->dimensions;
315
316 if (tmp_vlc_bits[i]) {
317 float last=0.0;
318 uint_fast32_t lookup_offset=i;
319
320 #ifdef V_DEBUG
321 av_log(vc->avccontext, AV_LOG_INFO, "Lookup offset %d ,", i);
322 #endif
323
324 for(k=0;k<dim;++k) {
325 uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values;
326 codebook_setup->codevectors[j*dim+k]=codebook_multiplicands[multiplicand_offset]*codebook_delta_value+codebook_minimum_value+last;
327 if (codebook_sequence_p) {
328 last=codebook_setup->codevectors[j*dim+k];
329 }
330 lookup_offset/=codebook_lookup_values;
331 }
332 tmp_vlc_bits[j]=tmp_vlc_bits[i];
333
334 #ifdef V_DEBUG
335 av_log(vc->avccontext, AV_LOG_INFO, "real lookup offset %d, vector: ", j);
336 for(k=0;k<dim;++k) {
337 av_log(vc->avccontext, AV_LOG_INFO, " %f ", codebook_setup->codevectors[j*dim+k]);
338 }
339 av_log(vc->avccontext, AV_LOG_INFO, "\n");
340 #endif
341
342 ++j;
343 }
344 }
345 if (j!=used_entries) {
346 av_log(vc->avccontext, AV_LOG_ERROR, "Bug in codevector vector building code. \n");
347 goto error;
348 }
349 entries=used_entries;
350 }
351 else if (codebook_setup->lookup_type>=2) {
352 av_log(vc->avccontext, AV_LOG_ERROR, "Codebook lookup type not supported. \n");
353 goto error;
354 }
355
356 // Initialize VLC table
357 if (vorbis_len2vlc(vc, tmp_vlc_bits, tmp_vlc_codes, entries)) {
358 av_log(vc->avccontext, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");
359 goto error;
360 }
361 codebook_setup->maxdepth=0;
362 for(t=0;t<entries;++t)
363 if (tmp_vlc_bits[t]>=codebook_setup->maxdepth) codebook_setup->maxdepth=tmp_vlc_bits[t];
364
365 if(codebook_setup->maxdepth > 3*V_NB_BITS) codebook_setup->nb_bits=V_NB_BITS2;
366 else codebook_setup->nb_bits=V_NB_BITS;
367
368 codebook_setup->maxdepth=(codebook_setup->maxdepth+codebook_setup->nb_bits-1)/codebook_setup->nb_bits;
369
370 if (init_vlc(&codebook_setup->vlc, codebook_setup->nb_bits, entries, tmp_vlc_bits, sizeof(*tmp_vlc_bits), sizeof(*tmp_vlc_bits), tmp_vlc_codes, sizeof(*tmp_vlc_codes), sizeof(*tmp_vlc_codes), INIT_VLC_LE)) {
371 av_log(vc->avccontext, AV_LOG_ERROR, " Error generating vlc tables. \n");
372 goto error;
373 }
374 }
375
376 av_free(tmp_vlc_bits);
377 av_free(tmp_vlc_codes);
378 return 0;
379
380 // Error:
381 error:
382 av_free(tmp_vlc_bits);
383 av_free(tmp_vlc_codes);
384 return 1;
385 }
386
387 // Process time domain transforms part (unused in Vorbis I)
388
389 static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc) {
390 GetBitContext *gb=&vc->gb;
391 uint_fast8_t i;
392 uint_fast8_t vorbis_time_count=get_bits(gb, 6)+1;
393
394 for(i=0;i<vorbis_time_count;++i) {
395 uint_fast16_t vorbis_tdtransform=get_bits(gb, 16);
396
397 AV_DEBUG(" Vorbis time domain transform %d: %d \n", vorbis_time_count, vorbis_tdtransform);
398
399 if (vorbis_tdtransform) {
400 av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n");
401 return 1;
402 }
403 }
404 return 0;
405 }
406
407 // Process floors part - only floor type 1 is supported
408
409 static int vorbis_parse_setup_hdr_floors(vorbis_context *vc) {
410 GetBitContext *gb=&vc->gb;
411 uint_fast16_t i,j,k;
412
413 vc->floor_count=get_bits(gb, 6)+1;
414
415 vc->floors=(vorbis_floor *)av_mallocz(vc->floor_count * sizeof(vorbis_floor));
416
417 for (i=0;i<vc->floor_count;++i) {
418 vorbis_floor *floor_setup=&vc->floors[i];
419
420 floor_setup->floor_type=get_bits(gb, 16);
421
422 AV_DEBUG(" %d. floor type %d \n", i, floor_setup->floor_type);
423
424 if (floor_setup->floor_type==1) {
425 uint_fast8_t maximum_class=0;
426 uint_fast8_t rangebits;
427 uint_fast16_t floor1_values=2;
428
429 floor_setup->partitions=get_bits(gb, 5);
430
431 AV_DEBUG(" %d.floor: %d partitions \n", i, floor_setup->partitions);
432
433 for(j=0;j<floor_setup->partitions;++j) {
434 floor_setup->partition_class[j]=get_bits(gb, 4);
435 if (floor_setup->partition_class[j]>maximum_class) maximum_class=floor_setup->partition_class[j];
436
437 AV_DEBUG(" %d. floor %d partition class %d \n", i, j, floor_setup->partition_class[j]);
438
439 }
440
441 AV_DEBUG(" maximum class %d \n", maximum_class);
442
443 floor_setup->maximum_class=maximum_class;
444
445 for(j=0;j<=maximum_class;++j) {
446 floor_setup->class_dimensions[j]=get_bits(gb, 3)+1;
447 floor_setup->class_subclasses[j]=get_bits(gb, 2);
448
449 AV_DEBUG(" %d floor %d class dim: %d subclasses %d \n", i, j, floor_setup->class_dimensions[j], floor_setup->class_subclasses[j]);
450
451 if (floor_setup->class_subclasses[j]) {
452 floor_setup->class_masterbook[j]=get_bits(gb, 8);
453
454 AV_DEBUG(" masterbook: %d \n", floor_setup->class_masterbook[j]);
455 }
456
457 for(k=0;k<(1<<floor_setup->class_subclasses[j]);++k) {
458 floor_setup->subclass_books[j][k]=get_bits(gb, 8)-1;
459
460 AV_DEBUG(" book %d. : %d \n", k, floor_setup->subclass_books[j][k]);
461 }
462 }
463
464 floor_setup->multiplier=get_bits(gb, 2)+1;
465 floor_setup->x_list_dim=2;
466
467 for(j=0;j<floor_setup->partitions;++j) {
468 floor_setup->x_list_dim+=floor_setup->class_dimensions[floor_setup->partition_class[j]];
469 }
470
471 floor_setup->x_list=(uint_fast16_t *)av_mallocz(floor_setup->x_list_dim * sizeof(uint_fast16_t));
472 floor_setup->x_list_order=(uint_fast16_t *)av_mallocz(floor_setup->x_list_dim * sizeof(uint_fast16_t));
473 floor_setup->low_neighbour=(uint_fast16_t *)av_mallocz(floor_setup->x_list_dim * sizeof(uint_fast16_t));
474 floor_setup->high_neighbour=(uint_fast16_t *)av_mallocz(floor_setup->x_list_dim * sizeof(uint_fast16_t));
475
476
477 rangebits=get_bits(gb, 4);
478 floor_setup->x_list[0] = 0;
479 floor_setup->x_list[1] = (1<<rangebits);
480
481 for(j=0;j<floor_setup->partitions;++j) {
482 for(k=0;k<floor_setup->class_dimensions[floor_setup->partition_class[j]];++k,++floor1_values) {
483 floor_setup->x_list[floor1_values]=get_bits(gb, rangebits);
484
485 AV_DEBUG(" %d. floor1 Y coord. %d \n", floor1_values, floor_setup->x_list[floor1_values]);
486 }
487 }
488
489 // Precalculate order of x coordinates - needed for decode
490
491 for(k=0;k<floor_setup->x_list_dim;++k) {
492 floor_setup->x_list_order[k]=k;
493 }
494
495 for(k=0;k<floor_setup->x_list_dim-1;++k) { // FIXME optimize sorting ?
496 for(j=k+1;j<floor_setup->x_list_dim;++j) {
497 if(floor_setup->x_list[floor_setup->x_list_order[k]]>floor_setup->x_list[floor_setup->x_list_order[j]]) {
498 uint_fast16_t tmp=floor_setup->x_list_order[k];
499 floor_setup->x_list_order[k]=floor_setup->x_list_order[j];
500 floor_setup->x_list_order[j]=tmp;
501 }
502 }
503 }
504
505 // Precalculate low and high neighbours
506
507 for(k=2;k<floor_setup->x_list_dim;++k) {
508 floor_setup->low_neighbour[k]=0;
509 floor_setup->high_neighbour[k]=1; // correct according to SPEC requirements
510
511 for (j=0;j<k;++j) {
512 if ((floor_setup->x_list[j]<floor_setup->x_list[k]) &&
513 (floor_setup->x_list[j]>floor_setup->x_list[floor_setup->low_neighbour[k]])) {
514 floor_setup->low_neighbour[k]=j;
515 }
516 if ((floor_setup->x_list[j]>floor_setup->x_list[k]) &&
517 (floor_setup->x_list[j]<floor_setup->x_list[floor_setup->high_neighbour[k]])) {
518 floor_setup->high_neighbour[k]=j;
519 }
520 }
521 }
522 }
523 else {
524 av_log(vc->avccontext, AV_LOG_ERROR, "Only floor type 1 supported. \n");
525 return 1;
526 }
527 }
528 return 0;
529 }
530
531 // Process residues part
532
533 static int vorbis_parse_setup_hdr_residues(vorbis_context *vc){
534 GetBitContext *gb=&vc->gb;
535 uint_fast8_t i, j, k;
536
537 vc->residue_count=get_bits(gb, 6)+1;
538 vc->residues=(vorbis_residue *)av_mallocz(vc->residue_count * sizeof(vorbis_residue));
539
540 AV_DEBUG(" There are %d residues. \n", vc->residue_count);
541
542 for(i=0;i<vc->residue_count;++i) {
543 vorbis_residue *res_setup=&vc->residues[i];
544 uint_fast8_t cascade[64];
545 uint_fast8_t high_bits;
546 uint_fast8_t low_bits;
547
548 res_setup->type=get_bits(gb, 16);
549
550 AV_DEBUG(" %d. residue type %d \n", i, res_setup->type);
551
552 res_setup->begin=get_bits(gb, 24);
553 res_setup->end=get_bits(gb, 24);
554 res_setup->partition_size=get_bits(gb, 24)+1;
555 res_setup->classifications=get_bits(gb, 6)+1;
556 res_setup->classbook=get_bits(gb, 8);
557
558 AV_DEBUG(" begin %d end %d part.size %d classif.s %d classbook %d \n", res_setup->begin, res_setup->end, res_setup->partition_size,
559 res_setup->classifications, res_setup->classbook);
560
561 for(j=0;j<res_setup->classifications;++j) {
562 high_bits=0;
563 low_bits=get_bits(gb, 3);
564 if (get_bits1(gb)) {
565 high_bits=get_bits(gb, 5);
566 }
567 cascade[j]=(high_bits<<3)+low_bits;
568
569 AV_DEBUG(" %d class casscade depth: %d \n", j, ilog(cascade[j]));
570 }
571
572 res_setup->maxpass=0;
573 for(j=0;j<res_setup->classifications;++j) {
574 for(k=0;k<8;++k) {
575 if (cascade[j]&(1<<k)) {
576 res_setup->books[j][k]=get_bits(gb, 8);
577
578 AV_DEBUG(" %d class casscade depth %d book: %d \n", j, k, res_setup->books[j][k]);
579
580 if (k>res_setup->maxpass) {
581 res_setup->maxpass=k;
582 }
583 } else {
584 res_setup->books[j][k]=-1;
585 }
586 }
587 }
588 }
589 return 0;
590 }
591
592 // Process mappings part
593
594 static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc) {
595 GetBitContext *gb=&vc->gb;
596 uint_fast8_t i, j;
597
598 vc->mapping_count=get_bits(gb, 6)+1;
599 vc->mappings=(vorbis_mapping *)av_mallocz(vc->mapping_count * sizeof(vorbis_mapping));
600
601 AV_DEBUG(" There are %d mappings. \n", vc->mapping_count);
602
603 for(i=0;i<vc->mapping_count;++i) {
604 vorbis_mapping *mapping_setup=&vc->mappings[i];
605
606 if (get_bits(gb, 16)) {
607 av_log(vc->avccontext, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n");
608 return 1;
609 }
610 if (get_bits1(gb)) {
611 mapping_setup->submaps=get_bits(gb, 4)+1;
612 } else {
613 mapping_setup->submaps=1;
614 }
615
616 if (get_bits1(gb)) {
617 mapping_setup->coupling_steps=get_bits(gb, 8)+1;
618 mapping_setup->magnitude=(uint_fast8_t *)av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
619 mapping_setup->angle=(uint_fast8_t *)av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
620 for(j=0;j<mapping_setup->coupling_steps;++j) {
621 mapping_setup->magnitude[j]=get_bits(gb, ilog(vc->audio_channels-1));
622 mapping_setup->angle[j]=get_bits(gb, ilog(vc->audio_channels-1));
623 // FIXME: sanity checks
624 }
625 } else {
626 mapping_setup->coupling_steps=0;
627 }
628
629 AV_DEBUG(" %d mapping coupling steps: %d \n", i, mapping_setup->coupling_steps);
630
631 if(get_bits(gb, 2)) {
632 av_log(vc->avccontext, AV_LOG_ERROR, "%d. mapping setup data invalid. \n", i);
633 return 1; // following spec.
634 }
635
636 if (mapping_setup->submaps>1) {
637 mapping_setup->mux=(uint_fast8_t *)av_mallocz(vc->audio_channels * sizeof(uint_fast8_t));
638 for(j=0;j<vc->audio_channels;++j) {
639 mapping_setup->mux[j]=get_bits(gb, 4);
640 }
641 }
642
643 for(j=0;j<mapping_setup->submaps;++j) {
644 get_bits(gb, 8); // FIXME check?
645 mapping_setup->submap_floor[j]=get_bits(gb, 8);
646 mapping_setup->submap_residue[j]=get_bits(gb, 8);
647
648 AV_DEBUG(" %d mapping %d submap : floor %d, residue %d \n", i, j, mapping_setup->submap_floor[j], mapping_setup->submap_residue[j]);
649 }
650 }
651 return 0;
652 }
653
654 // Process modes part
655
656 static int vorbis_parse_setup_hdr_modes(vorbis_context *vc) {
657 GetBitContext *gb=&vc->gb;
658 uint_fast8_t i;
659
660 vc->mode_count=get_bits(gb, 6)+1;
661 vc->modes=(vorbis_mode *)av_mallocz(vc->mode_count * sizeof(vorbis_mode));
662
663 AV_DEBUG(" There are %d modes.\n", vc->mode_count);
664
665 for(i=0;i<vc->mode_count;++i) {
666 vorbis_mode *mode_setup=&vc->modes[i];
667
668 mode_setup->blockflag=get_bits(gb, 1);
669 mode_setup->windowtype=get_bits(gb, 16); //FIXME check
670 mode_setup->transformtype=get_bits(gb, 16); //FIXME check
671 mode_setup->mapping=get_bits(gb, 8); //FIXME check
672
673 AV_DEBUG(" %d mode: blockflag %d, windowtype %d, transformtype %d, mapping %d \n", i, mode_setup->blockflag, mode_setup->windowtype, mode_setup->transformtype, mode_setup->mapping);
674 }
675 return 0;
676 }
677
678 // Process the whole setup header using the functions above
679
680 static int vorbis_parse_setup_hdr(vorbis_context *vc) {
681 GetBitContext *gb=&vc->gb;
682
683 if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') ||
684 (get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') ||
685 (get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) {
686 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n");
687 return 1;
688 }
689
690 if (vorbis_parse_setup_hdr_codebooks(vc)) {
691 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n");
692 return 2;
693 }
694 if (vorbis_parse_setup_hdr_tdtransforms(vc)) {
695 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n");
696 return 3;
697 }
698 if (vorbis_parse_setup_hdr_floors(vc)) {
699 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n");
700 return 4;
701 }
702 if (vorbis_parse_setup_hdr_residues(vc)) {
703 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n");
704 return 5;
705 }
706 if (vorbis_parse_setup_hdr_mappings(vc)) {
707 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n");
708 return 6;
709 }
710 if (vorbis_parse_setup_hdr_modes(vc)) {
711 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n");
712 return 7;
713 }
714 if (!get_bits1(gb)) {
715 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n");
716 return 8; // framing flag bit unset error
717 }
718
719 return 0;
720 }
721
722 // Process the identification header
723
724 static int vorbis_parse_id_hdr(vorbis_context *vc){
725 GetBitContext *gb=&vc->gb;
726 uint_fast8_t bl0, bl1;
727 const float *vwin[8]={ vwin64, vwin128, vwin256, vwin512, vwin1024, vwin2048, vwin4096, vwin8192 };
728
729 if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') ||
730 (get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') ||
731 (get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) {
732 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n");
733 return 1;
734 }
735
736 vc->version=get_bits_long_le(gb, 32); //FIXME check 0
737 vc->audio_channels=get_bits(gb, 8); //FIXME check >0
738 vc->audio_samplerate=get_bits_long_le(gb, 32); //FIXME check >0
739 vc->bitrate_maximum=get_bits_long_le(gb, 32);
740 vc->bitrate_nominal=get_bits_long_le(gb, 32);
741 vc->bitrate_minimum=get_bits_long_le(gb, 32);
742 bl0=get_bits(gb, 4);
743 bl1=get_bits(gb, 4);
744 vc->blocksize_0=(1<<bl0);
745 vc->blocksize_1=(1<<bl1);
746 if (bl0>13 || bl0<6 || bl1>13 || bl1<6) {
747 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n");
748 return 3;
749 }
750 vc->swin=vwin[bl0-6];
751 vc->lwin=vwin[bl1-6];
752
753 if ((get_bits1(gb)) == 0) {
754 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n");
755 return 2;
756 }
757
758 vc->channel_residues=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
759 vc->channel_floors=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
760 vc->saved=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
761 vc->ret=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
762 vc->buf=(float *)av_malloc(vc->blocksize_1 * sizeof(float));
763 vc->buf_tmp=(float *)av_malloc(vc->blocksize_1 * sizeof(float));
764 vc->saved_start=0;
765
766 ff_mdct_init(&vc->mdct0, bl0, 1);
767 ff_mdct_init(&vc->mdct1, bl1, 1);
768
769 AV_DEBUG(" vorbis version %d \n audio_channels %d \n audio_samplerate %d \n bitrate_max %d \n bitrate_nom %d \n bitrate_min %d \n blk_0 %d blk_1 %d \n ",
770 vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize_0, vc->blocksize_1);
771
772 /*
773 BLK=vc->blocksize_0;
774 for(i=0;i<BLK/2;++i) {
775 vc->swin[i]=sin(0.5*3.14159265358*(sin(((float)i+0.5)/(float)BLK*3.14159265358))*(sin(((float)i+0.5)/(float)BLK*3.14159265358)));
776 }
777 */
778
779 return 0;
780 }
781
782 // Process the extradata using the functions above (identification header, setup header)
783
784 static int vorbis_decode_init(AVCodecContext *avccontext) {
785 vorbis_context *vc = avccontext->priv_data ;
786 uint8_t *headers = avccontext->extradata;
787 int headers_len=avccontext->extradata_size;
788 uint8_t *header_start[3];
789 int header_len[3];
790 GetBitContext *gb = &(vc->gb);
791 int i, j, hdr_type;
792
793 vc->avccontext = avccontext;
794
795 if (!headers_len) {
796 av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
797 return -1;
798 }
799
800 if(headers[0] == 0 && headers[1] == 30) {
801 for(i = 0; i < 3; i++){
802 header_len[i] = *headers++ << 8;
803 header_len[i] += *headers++;
804 header_start[i] = headers;
805 headers += header_len[i];
806 }
807 } else if(headers[0] == 2) {
808 for(j=1,i=0;i<2;++i, ++j) {
809 header_len[i]=0;
810 while(j<headers_len && headers[j]==0xff) {
811 header_len[i]+=0xff;
812 ++j;
813 }
814 if (j>=headers_len) {
815 av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
816 return -1;
817 }
818 header_len[i]+=headers[j];
819 }
820 header_len[2]=headers_len-header_len[0]-header_len[1]-j;
821 headers+=j;
822 header_start[0] = headers;
823 header_start[1] = header_start[0] + header_len[0];
824 header_start[2] = header_start[1] + header_len[1];
825 } else {
826 av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
827 return -1;
828 }
829
830 init_get_bits(gb, header_start[0], header_len[0]*8);
831 hdr_type=get_bits(gb, 8);
832 if (hdr_type!=1) {
833 av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n");
834 return -1;
835 }
836 if (vorbis_parse_id_hdr(vc)) {
837 av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n");
838 vorbis_free(vc);
839 return -1;
840 }
841
842 init_get_bits(gb, header_start[2], header_len[2]*8);
843 hdr_type=get_bits(gb, 8);
844 if (hdr_type!=5) {
845 av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");
846 return -1;
847 }
848 if (vorbis_parse_setup_hdr(vc)) {
849 av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");
850 vorbis_free(vc);
851 return -1;
852 }
853
854 avccontext->channels = vc->audio_channels;
855 avccontext->sample_rate = vc->audio_samplerate;
856
857 return 0 ;
858 }
859
860 // Decode audiopackets -------------------------------------------------
861
862 // Read and decode floor (type 1 only)
863
864 static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc, vorbis_floor *vf, float *vec) {
865 GetBitContext *gb=&vc->gb;
866 uint_fast16_t range_v[4]={ 256, 128, 86, 64 };
867 uint_fast16_t range=range_v[vf->multiplier-1];
868 uint_fast16_t floor1_Y[vf->x_list_dim];
869 uint_fast16_t floor1_Y_final[vf->x_list_dim];
870 uint_fast8_t floor1_flag[vf->x_list_dim];
871 uint_fast8_t class_;
872 uint_fast8_t cdim;
873 uint_fast8_t cbits;
874 uint_fast8_t csub;
875 uint_fast8_t cval;
876 int_fast16_t book;
877 uint_fast16_t offset;
878 uint_fast16_t i,j;
879 uint_fast16_t *floor_x_sort=vf->x_list_order;
880 /*u*/int_fast16_t adx, ady, off, predicted; // WTF ? dy/adx= (unsigned)dy/adx ?
881 int_fast16_t dy, err;
882 uint_fast16_t lx,hx, ly, hy=0;
883
884
885 if (!get_bits1(gb)) return 1; // silence
886
887 // Read values (or differences) for the floor's points
888
889 floor1_Y[0]=get_bits(gb, ilog(range-1));
890 floor1_Y[1]=get_bits(gb, ilog(range-1));
891
892 AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);
893
894 offset=2;
895 for(i=0;i<vf->partitions;++i) {
896 class_=vf->partition_class[i];
897 cdim=vf->class_dimensions[class_];
898 cbits=vf->class_subclasses[class_];
899 csub=(1<<cbits)-1;
900 cval=0;
901
902 AV_DEBUG("Cbits %d \n", cbits);
903
904 if (cbits) { // this reads all subclasses for this partition's class
905 cval=get_vlc2(gb, vc->codebooks[vf->class_masterbook[class_]].vlc.table,
906 vc->codebooks[vf->class_masterbook[class_]].nb_bits, 3);
907 }
908
909 for(j=0;j<cdim;++j) {
910 book=vf->subclass_books[class_][cval & csub];
911
912 AV_DEBUG("book %d Cbits %d cval %d bits:%d \n", book, cbits, cval, get_bits_count(gb));
913
914 cval=cval>>cbits;
915 if (book>0) {
916 floor1_Y[offset+j]=get_vlc2(gb, vc->codebooks[book].vlc.table,
917 vc->codebooks[book].nb_bits, 3);
918 } else {
919 floor1_Y[offset+j]=0;
920 }
921
922 AV_DEBUG(" floor(%d) = %d \n", vf->x_list[offset+j], floor1_Y[offset+j]);
923 }
924 offset+=cdim;
925 }
926
927 // Amplitude calculation from the differences
928
929 floor1_flag[0]=1;
930 floor1_flag[1]=1;
931 floor1_Y_final[0]=floor1_Y[0];
932 floor1_Y_final[1]=floor1_Y[1];
933
934 for(i=2;i<vf->x_list_dim;++i) {
935 uint_fast16_t val, highroom, lowroom, room;
936 uint_fast16_t high_neigh_offs;
937 uint_fast16_t low_neigh_offs;
938
939 low_neigh_offs=vf->low_neighbour[i];
940 high_neigh_offs=vf->high_neighbour[i];
941 dy=floor1_Y_final[high_neigh_offs]-floor1_Y_final[low_neigh_offs]; // render_point begin
942 adx=vf->x_list[high_neigh_offs]-vf->x_list[low_neigh_offs];
943 ady= ABS(dy);
944 err=ady*(vf->x_list[i]-vf->x_list[low_neigh_offs]);
945 off=err/adx;
946 if (dy<0) {
947 predicted=floor1_Y_final[low_neigh_offs]-off;
948 } else {
949 predicted=floor1_Y_final[low_neigh_offs]+off;
950 } // render_point end
951
952 val=floor1_Y[i];
953 highroom=range-predicted;
954 lowroom=predicted;
955 if (highroom < lowroom) {
956 room=highroom*2;
957 } else {
958 room=lowroom*2; // SPEC mispelling
959 }
960 if (val) {
961 floor1_flag[low_neigh_offs]=1;
962 floor1_flag[high_neigh_offs]=1;
963 floor1_flag[i]=1;
964 if (val>=room) {
965 if (highroom > lowroom) {
966 floor1_Y_final[i]=val-lowroom+predicted;
967 } else {
968 floor1_Y_final[i]=predicted-val+highroom-1;
969 }
970 } else {
971 if (val & 1) {
972 floor1_Y_final[i]=predicted-(val+1)/2;
973 } else {
974 floor1_Y_final[i]=predicted+val/2;
975 }
976 }
977 } else {
978 floor1_flag[i]=0;
979 floor1_Y_final[i]=predicted;
980 }
981
982 AV_DEBUG(" Decoded floor(%d) = %d / val %d \n", vf->x_list[i], floor1_Y_final[i], val);
983 }
984
985 // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?
986
987 hx=0;
988 lx=0;
989 ly=floor1_Y_final[0]*vf->multiplier; // conforms to SPEC
990
991 vec[0]=floor1_inverse_db_table[ly];
992
993 for(i=1;i<vf->x_list_dim;++i) {
994 AV_DEBUG(" Looking at post %d \n", i);
995
996 if (floor1_flag[floor_x_sort[i]]) { // SPEC mispelled
997 int_fast16_t x, y, dy, base, sy; // if uncommented: dy = -32 adx = 2 base = 2blablabla ?????
998
999 hy=floor1_Y_final[floor_x_sort[i]]*vf->multiplier;
1000 hx=vf->x_list[floor_x_sort[i]];
1001
1002 dy=hy-ly;
1003 adx=hx-lx;
1004 ady= (dy<0) ? -dy:dy;//ABS(dy);
1005 base=dy/adx;
1006
1007 AV_DEBUG(" dy %d adx %d base %d = %d \n", dy, adx, base, dy/adx);
1008
1009 x=lx;
1010 y=ly;
1011 err=0;
1012 if (dy<0) {
1013 sy=base-1;
1014 } else {
1015 sy=base+1;
1016 }
1017 ady=ady-(base<0 ? -base : base)*adx;
1018 vec[x]=floor1_inverse_db_table[y];
1019
1020 AV_DEBUG(" vec[ %d ] = %d \n", x, y);
1021
1022 for(x=lx+1;(x<hx) && (x<vf->x_list[1]);++x) {
1023 err+=ady;
1024 if (err>=adx) {
1025 err-=adx;
1026 y+=sy;
1027 } else {
1028 y+=base;
1029 }
1030 vec[x]=floor1_inverse_db_table[y];
1031
1032 AV_DEBUG(" vec[ %d ] = %d \n", x, y);
1033 }
1034
1035 /* for(j=1;j<hx-lx+1;++j) { // iterating render_point
1036 dy=hy-ly;
1037 adx=hx-lx;
1038 ady= dy<0 ? -dy : dy;
1039 err=ady*j;
1040 off=err/adx;
1041 if (dy<0) {
1042 predicted=ly-off;
1043 } else {
1044 predicted=ly+off;
1045 }
1046 if (lx+j < vf->x_list[1]) {
1047 vec[lx+j]=floor1_inverse_db_table[predicted];
1048 }
1049 }*/
1050
1051 lx=hx;
1052 ly=hy;
1053 }
1054 }
1055
1056 if (hx<vf->x_list[1]) {
1057 for(i=hx;i<vf->x_list[1];++i) {
1058 vec[i]=floor1_inverse_db_table[hy];
1059 }
1060 }
1061
1062 AV_DEBUG(" Floor decoded\n");
1063
1064 return 0;
1065 }
1066
1067 // Read and decode residue
1068
1069 static int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr, uint_fast8_t ch, uint_fast8_t *do_not_decode, float *vec, uint_fast16_t vlen) {
1070 GetBitContext *gb=&vc->gb;
1071 uint_fast8_t c_p_c=vc->codebooks[vr->classbook].dimensions;
1072 uint_fast16_t n_to_read=vr->end-vr->begin;
1073 uint_fast16_t ptns_to_read=n_to_read/vr->partition_size;
1074 uint_fast8_t classifs[ptns_to_read*vc->audio_channels];
1075 uint_fast8_t pass;
1076 uint_fast8_t ch_used;
1077 uint_fast8_t i,j,l;
1078 uint_fast16_t k;
1079
1080 if (vr->type==2) {
1081 for(j=1;j<ch;++j) {
1082 do_not_decode[0]&=do_not_decode[j]; // FIXME - clobbering input
1083 }
1084 if (do_not_decode[0]) return 0;
1085 ch_used=1;
1086 } else {
1087 ch_used=ch;
1088 }
1089
1090 AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d cpc %d \n", ch, c_p_c);
1091
1092 for(pass=0;pass<=vr->maxpass;++pass) { // FIXME OPTIMIZE?
1093 uint_fast16_t voffset;
1094 uint_fast16_t partition_count;
1095 uint_fast16_t j_times_ptns_to_read;
1096
1097 voffset=vr->begin;
1098 for(partition_count=0;partition_count<ptns_to_read;) { // SPEC error
1099 if (!pass) {
1100 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {
1101 if (!do_not_decode[j]) {
1102 uint_fast32_t temp=get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,
1103 vc->codebooks[vr->classbook].nb_bits, 3);
1104
1105 AV_DEBUG("Classword: %d \n", temp);
1106
1107 assert(vr->classifications > 1 && vr->classifications<256 && temp<=65536); //needed for inverse[]
1108 for(i=0;i<c_p_c;++i) {
1109 uint_fast32_t temp2;
1110
1111 temp2=(((uint_fast64_t)temp) * inverse[vr->classifications])>>32;
1112 classifs[j_times_ptns_to_read+partition_count+c_p_c-1-i]=temp-temp2*vr->classifications;
1113 temp=temp2;
1114 }
1115 }
1116 j_times_ptns_to_read+=ptns_to_read;
1117 }
1118 }
1119 for(i=0;(i<c_p_c) && (partition_count<ptns_to_read);++i) {
1120 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {
1121 uint_fast16_t voffs;
1122
1123 if (!do_not_decode[j]) {
1124 uint_fast8_t vqclass=classifs[j_times_ptns_to_read+partition_count];
1125 int_fast16_t vqbook=vr->books[vqclass][pass];
1126
1127 if (vqbook>=0) {
1128 uint_fast16_t coffs;
1129 uint_fast16_t step=vr->partition_size/vc->codebooks[vqbook].dimensions;
1130 vorbis_codebook codebook= vc->codebooks[vqbook];
1131
1132 if (vr->type==0) {
1133
1134 voffs=voffset+j*vlen;
1135 for(k=0;k<step;++k) {
1136 coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * codebook.dimensions;
1137 for(l=0;l<codebook.dimensions;++l) {
1138 vec[voffs+k+l*step]+=codebook.codevectors[coffs+l]; // FPMATH
1139 }
1140 }
1141 }
1142 else if (vr->type==1) {
1143 voffs=voffset+j*vlen;
1144 for(k=0;k<step;++k) {
1145 coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * codebook.dimensions;
1146 for(l=0;l<codebook.dimensions;++l, ++voffs) {
1147 vec[voffs]+=codebook.codevectors[coffs+l]; // FPMATH
1148
1149 AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d \n", pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);
1150 }
1151 }
1152 }
1153 else if (vr->type==2 && ch==2 && (voffset&1)==0 && (codebook.dimensions&1)==0) { // most frequent case optimized
1154 voffs=voffset>>1;
1155
1156 for(k=0;k<step;++k) {
1157 coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * codebook.dimensions;
1158 for(l=0;l<codebook.dimensions;l+=2, voffs++) {
1159 vec[voffs ]+=codebook.codevectors[coffs+l ]; // FPMATH
1160 vec[voffs+vlen]+=codebook.codevectors[coffs+l+1]; // FPMATH
1161
1162 AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d+%d \n", pass, voffset/ch+(voffs%ch)*vlen, vec[voffset/ch+(voffs%ch)*vlen], codebook.codevectors[coffs+l], coffs, l);
1163 }
1164 }
1165
1166 }
1167 else if (vr->type==2) {
1168 voffs=voffset;
1169
1170 for(k=0;k<step;++k) {
1171 coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * codebook.dimensions;
1172 for(l=0;l<codebook.dimensions;++l, ++voffs) {
1173 vec[voffs/ch+(voffs%ch)*vlen]+=codebook.codevectors[coffs+l]; // FPMATH FIXME use if and counter instead of / and %
1174
1175 AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d+%d \n", pass, voffset/ch+(voffs%ch)*vlen, vec[voffset/ch+(voffs%ch)*vlen], codebook.codevectors[coffs+l], coffs, l);
1176 }
1177 }
1178 } else {
1179 av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");
1180 return 1;
1181 }
1182 }
1183 }
1184 j_times_ptns_to_read+=ptns_to_read;
1185 }
1186 ++partition_count;
1187 voffset+=vr->partition_size;
1188 }
1189 }
1190 }
1191 return 0;
1192 }
1193
1194 // Decode the audio packet using the functions above
1195 #define BIAS 385
1196
1197 static int vorbis_parse_audio_packet(vorbis_context *vc) {
1198 GetBitContext *gb=&vc->gb;
1199
1200 uint_fast8_t previous_window=0,next_window=0;
1201 uint_fast8_t mode_number;
1202 uint_fast16_t blocksize;
1203 int_fast32_t i,j;
1204 uint_fast8_t no_residue[vc->audio_channels];
1205 uint_fast8_t do_not_decode[vc->audio_channels];
1206 vorbis_mapping *mapping;
1207 float *ch_res_ptr=vc->channel_residues;
1208 float *ch_floor_ptr=vc->channel_floors;
1209 uint_fast8_t res_chan[vc->audio_channels];
1210 uint_fast8_t res_num=0;
1211 int_fast16_t retlen=0;
1212 uint_fast16_t saved_start=0;
1213
1214 if (get_bits1(gb)) {
1215 av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");
1216 return -1; // packet type not audio
1217 }
1218
1219 if (vc->mode_count==1) {
1220 mode_number=0;
1221 } else {
1222 mode_number=get_bits(gb, ilog(vc->mode_count-1));
1223 }
1224 mapping=&vc->mappings[vc->modes[mode_number].mapping];
1225
1226 AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);
1227
1228 if (vc->modes[mode_number].blockflag) {
1229 previous_window=get_bits1(gb);
1230 next_window=get_bits1(gb);
1231 }
1232
1233 blocksize=vc->modes[mode_number].blockflag ? vc->blocksize_1 : vc->blocksize_0;
1234 memset(ch_res_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?
1235 memset(ch_floor_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?
1236
1237 // Decode floor(1)
1238
1239 for(i=0;i<vc->audio_channels;++i) {
1240 vorbis_floor *floor;
1241 if (mapping->submaps>1) {
1242 floor=&vc->floors[mapping->submap_floor[mapping->mux[i]]];
1243 } else {
1244 floor=&vc->floors[mapping->submap_floor[0]];
1245 }
1246
1247 no_residue[i]=vorbis_floor1_decode(vc, floor, ch_floor_ptr);
1248 ch_floor_ptr+=blocksize/2;
1249 }
1250
1251 // Nonzero vector propagate
1252
1253 for(i=mapping->coupling_steps-1;i>=0;--i) {
1254 if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {
1255 no_residue[mapping->magnitude[i]]=0;
1256 no_residue[mapping->angle[i]]=0;
1257 }
1258 }
1259
1260 // Decode residue
1261
1262 for(i=0;i<mapping->submaps;++i) {
1263 vorbis_residue *residue;
1264 uint_fast8_t ch=0;
1265
1266 for(j=0;j<vc->audio_channels;++j) {
1267 if ((mapping->submaps==1) || (i=mapping->mux[j])) {
1268 res_chan[j]=res_num;
1269 if (no_residue[j]) {
1270 do_not_decode[ch]=1;
1271 } else {
1272 do_not_decode[ch]=0;
1273 }
1274 ++ch;
1275 ++res_num;
1276 }
1277 }
1278 residue=&vc->residues[mapping->submap_residue[i]];
1279 vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);
1280
1281 ch_res_ptr+=ch*blocksize/2;
1282 }
1283
1284 // Inverse coupling
1285
1286 for(i=mapping->coupling_steps-1;i>=0;--i) { //warning: i has to be signed
1287 float *mag, *ang;
1288
1289 mag=vc->channel_residues+res_chan[mapping->magnitude[i]]*blocksize/2;
1290 ang=vc->channel_residues+res_chan[mapping->angle[i]]*blocksize/2;
1291 for(j=0;j<blocksize/2;++j) {
1292 float temp;
1293 if (mag[j]>0.0) {
1294 if (ang[j]>0.0) {
1295 ang[j]=mag[j]-ang[j];
1296 } else {
1297 temp=ang[j];
1298 ang[j]=mag[j];
1299 mag[j]+=temp;
1300 }
1301 } else {
1302 if (ang[j]>0.0) {
1303 ang[j]+=mag[j];
1304 } else {
1305 temp=ang[j];
1306 ang[j]=mag[j];
1307 mag[j]-=temp;
1308 }
1309 }
1310 }
1311 }
1312
1313 // Dotproduct
1314
1315 for(j=0, ch_floor_ptr=vc->channel_floors;j<vc->audio_channels;++j,ch_floor_ptr+=blocksize/2) {
1316 ch_res_ptr=vc->channel_residues+res_chan[j]*blocksize/2;
1317
1318 for(i=0;i<blocksize/2;++i) {
1319 ch_floor_ptr[i]*=ch_res_ptr[i]; //FPMATH
1320 }
1321 }
1322
1323 // MDCT, overlap/add, save data for next overlapping FPMATH
1324
1325 for(j=0;j<vc->audio_channels;++j) {
1326 uint_fast8_t step=vc->audio_channels;
1327 uint_fast16_t k;
1328 float *saved=vc->saved+j*vc->blocksize_1/2;
1329 float *ret=vc->ret;
1330 const float *lwin=vc->lwin;
1331 const float *swin=vc->swin;
1332 float *buf=vc->buf;
1333 float *buf_tmp=vc->buf_tmp;
1334
1335 ch_floor_ptr=vc->channel_floors+j*blocksize/2;
1336
1337 saved_start=vc->saved_start;
1338
1339 ff_imdct_calc(vc->modes[mode_number].blockflag ? &vc->mdct1 : &vc->mdct0, buf, ch_floor_ptr, buf_tmp);
1340
1341 if (vc->modes[mode_number].blockflag) {
1342 // -- overlap/add
1343 if (previous_window) {
1344 for(k=j, i=0;i<vc->blocksize_1/2;++i, k+=step) {
1345 ret[k]=saved[i]+buf[i]*lwin[i]+BIAS;
1346 }
1347 retlen=vc->blocksize_1/2;
1348 } else {
1349 buf += (vc->blocksize_1-vc->blocksize_0)/4;
1350 for(k=j, i=0;i<vc->blocksize_0/2;++i, k+=step) {
1351 ret[k]=saved[i]+buf[i]*swin[i]+BIAS;
1352 }
1353 buf += vc->blocksize_0/2;
1354 for(i=0;i<(vc->blocksize_1-vc->blocksize_0)/4;++i, k+=step) {
1355 ret[k]=buf[i]+BIAS;
1356 }
1357 buf=vc->buf;
1358 retlen=vc->blocksize_0/2+(vc->blocksize_1-vc->blocksize_0)/4;
1359 }
1360 // -- save
1361 if (next_window) {
1362 buf += vc->blocksize_1/2;
1363 lwin += vc->blocksize_1/2-1;
1364 for(i=0;i<vc->blocksize_1/2;++i) {
1365 saved[i]=buf[i]*lwin[-i];
1366 }
1367 saved_start=0;
1368 } else {
1369 saved_start=(vc->blocksize_1-vc->blocksize_0)/4;
1370 buf += vc->blocksize_1/2;
1371 for(i=0;i<saved_start;++i) {
1372 saved[i]=buf[i];
1373 }
1374 swin += vc->blocksize_0/2-1;
1375 for(i=0;i<vc->blocksize_0/2;++i) {
1376 saved[saved_start+i]=buf[saved_start+i]*swin[-i];
1377 }
1378 }
1379 } else {
1380 // --overlap/add
1381 for(k=j, i=0;i<saved_start;++i, k+=step) {
1382 ret[k]=saved[i]+BIAS;
1383 }
1384 for(i=0;i<vc->blocksize_0/2;++i, k+=step) {
1385 ret[k]=saved[saved_start+i]+buf[i]*swin[i]+BIAS;
1386 }
1387 retlen=saved_start+vc->blocksize_0/2;
1388 // -- save
1389 buf += vc->blocksize_0/2;
1390 swin += vc->blocksize_0/2-1;
1391 for(i=0;i<vc->blocksize_0/2;++i) {
1392 saved[i]=buf[i]*swin[-i];
1393 }
1394 saved_start=0;
1395 }
1396 }
1397 vc->saved_start=saved_start;
1398
1399 return retlen*vc->audio_channels;
1400 }
1401
1402 // Return the decoded audio packet through the standard api
1403
1404 static int vorbis_decode_frame(AVCodecContext *avccontext,
1405 void *data, int *data_size,
1406 uint8_t *buf, int buf_size)
1407 {
1408 vorbis_context *vc = avccontext->priv_data ;
1409 GetBitContext *gb = &(vc->gb);
1410
1411 int_fast16_t i, len;
1412
1413 if(!buf_size){
1414 return 0;
1415 }
1416
1417 AV_DEBUG("packet length %d \n", buf_size);
1418
1419 init_get_bits(gb, buf, buf_size*8);
1420
1421 len=vorbis_parse_audio_packet(vc);
1422
1423 if (len<=0) {
1424 *data_size=0;
1425 return buf_size;
1426 }
1427
1428 if (!vc->first_frame) {
1429 vc->first_frame=1;
1430 *data_size=0;
1431 return buf_size ;
1432 }
1433
1434 AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);
1435
1436 for(i=0;i<len;++i) {
1437 int_fast32_t tmp= ((int32_t*)vc->ret)[i];
1438 if(tmp & 0xf0000){
1439 // tmp= (0x43c0ffff - tmp)>>31; //ask gcc devs why this is slower
1440 if(tmp > 0x43c0ffff) tmp= 0xFFFF;
1441 else tmp= 0;
1442 }
1443 ((int16_t*)data)[i]=tmp - 0x8000;
1444 }
1445
1446 *data_size=len*2;
1447
1448 return buf_size ;
1449 }
1450
1451 // Close decoder
1452
1453 static int vorbis_decode_close(AVCodecContext *avccontext) {
1454 vorbis_context *vc = avccontext->priv_data;
1455
1456 vorbis_free(vc);
1457
1458 return 0 ;
1459 }
1460
1461 AVCodec vorbis_decoder = {
1462 "vorbis",
1463 CODEC_TYPE_AUDIO,
1464 CODEC_ID_VORBIS,
1465 sizeof(vorbis_context),
1466 vorbis_decode_init,
1467 NULL,
1468 vorbis_decode_close,
1469 vorbis_decode_frame,
1470 };
1471
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