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source: vbox/trunk/src/libs/ffmpeg-20060710/libavcodec/vorbis.c@ 11551

Last change on this file since 11551 was 5776, checked in by vboxsync, 17 years ago

ffmpeg: exported to OSE
File size: 60.0 KB
Line 
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 */
51static 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
64static 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
75static 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
85static 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
151static 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
197// Parse setup header -------------------------------------------------
198
199// Process codebooks part
200
201static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc) {
202 uint_fast16_t cb;
203 uint_fast8_t *tmp_vlc_bits;
204 uint_fast32_t *tmp_vlc_codes;
205 GetBitContext *gb=&vc->gb;
206
207 vc->codebook_count=get_bits(gb,8)+1;
208
209 AV_DEBUG(" Codebooks: %d \n", vc->codebook_count);
210
211 vc->codebooks=(vorbis_codebook *)av_mallocz(vc->codebook_count * sizeof(vorbis_codebook));
212 tmp_vlc_bits=(uint_fast8_t *)av_mallocz(V_MAX_VLCS * sizeof(uint_fast8_t));
213 tmp_vlc_codes=(uint_fast32_t *)av_mallocz(V_MAX_VLCS * sizeof(uint_fast32_t));
214
215 for(cb=0;cb<vc->codebook_count;++cb) {
216 vorbis_codebook *codebook_setup=&vc->codebooks[cb];
217 uint_fast8_t ordered;
218 uint_fast32_t t, used_entries=0;
219 uint_fast32_t entries;
220
221 AV_DEBUG(" %d. Codebook \n", cb);
222
223 if (get_bits(gb, 24)!=0x564342) {
224 av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook setup data corrupt. \n", cb);
225 goto error;
226 }
227
228 codebook_setup->dimensions=get_bits(gb, 16);
229 if (codebook_setup->dimensions>16) {
230 av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook's dimension is too large (%d). \n", cb, codebook_setup->dimensions);
231 goto error;
232 }
233 entries=get_bits(gb, 24);
234 if (entries>V_MAX_VLCS) {
235 av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook has too many entries (%"PRIdFAST32"). \n", cb, entries);
236 goto error;
237 }
238
239 ordered=get_bits1(gb);
240
241 AV_DEBUG(" codebook_dimensions %d, codebook_entries %d \n", codebook_setup->dimensions, entries);
242
243 if (!ordered) {
244 uint_fast16_t ce;
245 uint_fast8_t flag;
246 uint_fast8_t sparse=get_bits1(gb);
247
248 AV_DEBUG(" not ordered \n");
249
250 if (sparse) {
251 AV_DEBUG(" sparse \n");
252
253 used_entries=0;
254 for(ce=0;ce<entries;++ce) {
255 flag=get_bits1(gb);
256 if (flag) {
257 tmp_vlc_bits[ce]=get_bits(gb, 5)+1;
258 ++used_entries;
259 }
260 else tmp_vlc_bits[ce]=0;
261 }
262 } else {
263 AV_DEBUG(" not sparse \n");
264
265 used_entries=entries;
266 for(ce=0;ce<entries;++ce) {
267 tmp_vlc_bits[ce]=get_bits(gb, 5)+1;
268 }
269 }
270 } else {
271 uint_fast16_t current_entry=0;
272 uint_fast8_t current_length=get_bits(gb, 5)+1;
273
274 AV_DEBUG(" ordered, current length: %d \n", current_length); //FIXME
275
276 used_entries=entries;
277 for(;current_entry<used_entries;++current_length) {
278 uint_fast16_t i, number;
279
280 AV_DEBUG(" number bits: %d ", ilog(entries - current_entry));
281
282 number=get_bits(gb, ilog(entries - current_entry));
283
284 AV_DEBUG(" number: %d \n", number);
285
286 for(i=current_entry;i<number+current_entry;++i) {
287 if (i<used_entries) tmp_vlc_bits[i]=current_length;
288 }
289
290 current_entry+=number;
291 }
292 if (current_entry>used_entries) {
293 av_log(vc->avccontext, AV_LOG_ERROR, " More codelengths than codes in codebook. \n");
294 goto error;
295 }
296 }
297
298 codebook_setup->lookup_type=get_bits(gb, 4);
299
300 AV_DEBUG(" lookup type: %d : %s \n", codebook_setup->lookup_type, codebook_setup->lookup_type ? "vq" : "no lookup" );
301
302// If the codebook is used for (inverse) VQ, calculate codevectors.
303
304 if (codebook_setup->lookup_type==1) {
305 uint_fast16_t i, j, k;
306 uint_fast16_t codebook_lookup_values=nth_root(entries, codebook_setup->dimensions);
307 uint_fast16_t codebook_multiplicands[codebook_lookup_values];
308
309 float codebook_minimum_value=vorbisfloat2float(get_bits_long_le(gb, 32));
310 float codebook_delta_value=vorbisfloat2float(get_bits_long_le(gb, 32));
311 uint_fast8_t codebook_value_bits=get_bits(gb, 4)+1;
312 uint_fast8_t codebook_sequence_p=get_bits1(gb);
313
314 AV_DEBUG(" We expect %d numbers for building the codevectors. \n", codebook_lookup_values);
315 AV_DEBUG(" delta %f minmum %f \n", codebook_delta_value, codebook_minimum_value);
316
317 for(i=0;i<codebook_lookup_values;++i) {
318 codebook_multiplicands[i]=get_bits(gb, codebook_value_bits);
319
320 AV_DEBUG(" multiplicands*delta+minmum : %e \n", (float)codebook_multiplicands[i]*codebook_delta_value+codebook_minimum_value);
321 AV_DEBUG(" multiplicand %d \n", codebook_multiplicands[i]);
322 }
323
324// Weed out unused vlcs and build codevector vector
325 codebook_setup->codevectors=(float *)av_mallocz(used_entries*codebook_setup->dimensions * sizeof(float));
326 for(j=0, i=0;i<entries;++i) {
327 uint_fast8_t dim=codebook_setup->dimensions;
328
329 if (tmp_vlc_bits[i]) {
330 float last=0.0;
331 uint_fast32_t lookup_offset=i;
332
333#ifdef V_DEBUG
334 av_log(vc->avccontext, AV_LOG_INFO, "Lookup offset %d ,", i);
335#endif
336
337 for(k=0;k<dim;++k) {
338 uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values;
339 codebook_setup->codevectors[j*dim+k]=codebook_multiplicands[multiplicand_offset]*codebook_delta_value+codebook_minimum_value+last;
340 if (codebook_sequence_p) {
341 last=codebook_setup->codevectors[j*dim+k];
342 }
343 lookup_offset/=codebook_lookup_values;
344 }
345 tmp_vlc_bits[j]=tmp_vlc_bits[i];
346
347#ifdef V_DEBUG
348 av_log(vc->avccontext, AV_LOG_INFO, "real lookup offset %d, vector: ", j);
349 for(k=0;k<dim;++k) {
350 av_log(vc->avccontext, AV_LOG_INFO, " %f ", codebook_setup->codevectors[j*dim+k]);
351 }
352 av_log(vc->avccontext, AV_LOG_INFO, "\n");
353#endif
354
355 ++j;
356 }
357 }
358 if (j!=used_entries) {
359 av_log(vc->avccontext, AV_LOG_ERROR, "Bug in codevector vector building code. \n");
360 goto error;
361 }
362 entries=used_entries;
363 }
364 else if (codebook_setup->lookup_type>=2) {
365 av_log(vc->avccontext, AV_LOG_ERROR, "Codebook lookup type not supported. \n");
366 goto error;
367 }
368
369// Initialize VLC table
370 if (vorbis_len2vlc(vc, tmp_vlc_bits, tmp_vlc_codes, entries)) {
371 av_log(vc->avccontext, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");
372 goto error;
373 }
374 codebook_setup->maxdepth=0;
375 for(t=0;t<entries;++t)
376 if (tmp_vlc_bits[t]>=codebook_setup->maxdepth) codebook_setup->maxdepth=tmp_vlc_bits[t];
377
378 if(codebook_setup->maxdepth > 3*V_NB_BITS) codebook_setup->nb_bits=V_NB_BITS2;
379 else codebook_setup->nb_bits=V_NB_BITS;
380
381 codebook_setup->maxdepth=(codebook_setup->maxdepth+codebook_setup->nb_bits-1)/codebook_setup->nb_bits;
382
383 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)) {
384 av_log(vc->avccontext, AV_LOG_ERROR, " Error generating vlc tables. \n");
385 goto error;
386 }
387 }
388
389 av_free(tmp_vlc_bits);
390 av_free(tmp_vlc_codes);
391 return 0;
392
393// Error:
394error:
395 av_free(tmp_vlc_bits);
396 av_free(tmp_vlc_codes);
397 return 1;
398}
399
400// Process time domain transforms part (unused in Vorbis I)
401
402static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc) {
403 GetBitContext *gb=&vc->gb;
404 uint_fast8_t i;
405 uint_fast8_t vorbis_time_count=get_bits(gb, 6)+1;
406
407 for(i=0;i<vorbis_time_count;++i) {
408 uint_fast16_t vorbis_tdtransform=get_bits(gb, 16);
409
410 AV_DEBUG(" Vorbis time domain transform %d: %d \n", vorbis_time_count, vorbis_tdtransform);
411
412 if (vorbis_tdtransform) {
413 av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n");
414 return 1;
415 }
416 }
417 return 0;
418}
419
420// Process floors part
421
422static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,
423 vorbis_floor_data *vfu, float *vec);
424static void create_map( vorbis_context * vc, uint_fast8_t floor_number );
425static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc,
426 vorbis_floor_data *vfu, float *vec);
427static int vorbis_parse_setup_hdr_floors(vorbis_context *vc) {
428 GetBitContext *gb=&vc->gb;
429 uint_fast16_t i,j,k;
430
431 vc->floor_count=get_bits(gb, 6)+1;
432
433 vc->floors=(vorbis_floor *)av_mallocz(vc->floor_count * sizeof(vorbis_floor));
434
435 for (i=0;i<vc->floor_count;++i) {
436 vorbis_floor *floor_setup=&vc->floors[i];
437
438 floor_setup->floor_type=get_bits(gb, 16);
439
440 AV_DEBUG(" %d. floor type %d \n", i, floor_setup->floor_type);
441
442 if (floor_setup->floor_type==1) {
443 uint_fast8_t maximum_class=0;
444 uint_fast8_t rangebits;
445 uint_fast16_t floor1_values=2;
446
447 floor_setup->decode=vorbis_floor1_decode;
448
449 floor_setup->data.t1.partitions=get_bits(gb, 5);
450
451 AV_DEBUG(" %d.floor: %d partitions \n", i, floor_setup->data.t1.partitions);
452
453 for(j=0;j<floor_setup->data.t1.partitions;++j) {
454 floor_setup->data.t1.partition_class[j]=get_bits(gb, 4);
455 if (floor_setup->data.t1.partition_class[j]>maximum_class) maximum_class=floor_setup->data.t1.partition_class[j];
456
457 AV_DEBUG(" %d. floor %d partition class %d \n", i, j, floor_setup->data.t1.partition_class[j]);
458
459 }
460
461 AV_DEBUG(" maximum class %d \n", maximum_class);
462
463 floor_setup->data.t1.maximum_class=maximum_class;
464
465 for(j=0;j<=maximum_class;++j) {
466 floor_setup->data.t1.class_dimensions[j]=get_bits(gb, 3)+1;
467 floor_setup->data.t1.class_subclasses[j]=get_bits(gb, 2);
468
469 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]);
470
471 if (floor_setup->data.t1.class_subclasses[j]) {
472 floor_setup->data.t1.class_masterbook[j]=get_bits(gb, 8);
473
474 AV_DEBUG(" masterbook: %d \n", floor_setup->data.t1.class_masterbook[j]);
475 }
476
477 for(k=0;k<(1<<floor_setup->data.t1.class_subclasses[j]);++k) {
478 floor_setup->data.t1.subclass_books[j][k]=(int16_t)get_bits(gb, 8)-1;
479
480 AV_DEBUG(" book %d. : %d \n", k, floor_setup->data.t1.subclass_books[j][k]);
481 }
482 }
483
484 floor_setup->data.t1.multiplier=get_bits(gb, 2)+1;
485 floor_setup->data.t1.x_list_dim=2;
486
487 for(j=0;j<floor_setup->data.t1.partitions;++j) {
488 floor_setup->data.t1.x_list_dim+=floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];
489 }
490
491 floor_setup->data.t1.x_list=(uint_fast16_t *)av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(uint_fast16_t));
492 floor_setup->data.t1.x_list_order=(uint_fast16_t *)av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(uint_fast16_t));
493 floor_setup->data.t1.low_neighbour=(uint_fast16_t *)av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(uint_fast16_t));
494 floor_setup->data.t1.high_neighbour=(uint_fast16_t *)av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(uint_fast16_t));
495
496
497 rangebits=get_bits(gb, 4);
498 floor_setup->data.t1.x_list[0] = 0;
499 floor_setup->data.t1.x_list[1] = (1<<rangebits);
500
501 for(j=0;j<floor_setup->data.t1.partitions;++j) {
502 for(k=0;k<floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];++k,++floor1_values) {
503 floor_setup->data.t1.x_list[floor1_values]=get_bits(gb, rangebits);
504
505 AV_DEBUG(" %d. floor1 Y coord. %d \n", floor1_values, floor_setup->data.t1.x_list[floor1_values]);
506 }
507 }
508
509// Precalculate order of x coordinates - needed for decode
510
511 for(k=0;k<floor_setup->data.t1.x_list_dim;++k) {
512 floor_setup->data.t1.x_list_order[k]=k;
513 }
514
515 for(k=0;k<floor_setup->data.t1.x_list_dim-1;++k) { // FIXME optimize sorting ?
516 for(j=k+1;j<floor_setup->data.t1.x_list_dim;++j) {
517 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]]) {
518 uint_fast16_t tmp=floor_setup->data.t1.x_list_order[k];
519 floor_setup->data.t1.x_list_order[k]=floor_setup->data.t1.x_list_order[j];
520 floor_setup->data.t1.x_list_order[j]=tmp;
521 }
522 }
523 }
524
525// Precalculate low and high neighbours
526
527 for(k=2;k<floor_setup->data.t1.x_list_dim;++k) {
528 floor_setup->data.t1.low_neighbour[k]=0;
529 floor_setup->data.t1.high_neighbour[k]=1; // correct according to SPEC requirements
530
531 for (j=0;j<k;++j) {
532 if ((floor_setup->data.t1.x_list[j]<floor_setup->data.t1.x_list[k]) &&
533 (floor_setup->data.t1.x_list[j]>floor_setup->data.t1.x_list[floor_setup->data.t1.low_neighbour[k]])) {
534 floor_setup->data.t1.low_neighbour[k]=j;
535 }
536 if ((floor_setup->data.t1.x_list[j]>floor_setup->data.t1.x_list[k]) &&
537 (floor_setup->data.t1.x_list[j]<floor_setup->data.t1.x_list[floor_setup->data.t1.high_neighbour[k]])) {
538 floor_setup->data.t1.high_neighbour[k]=j;
539 }
540 }
541 }
542 }
543 else if(floor_setup->floor_type==0) {
544 uint_fast8_t max_codebook_dim=0;
545
546 floor_setup->decode=vorbis_floor0_decode;
547
548 floor_setup->data.t0.order=get_bits(gb, 8);
549 floor_setup->data.t0.rate=get_bits(gb, 16);
550 floor_setup->data.t0.bark_map_size=get_bits(gb, 16);
551 floor_setup->data.t0.amplitude_bits=get_bits(gb, 6);
552 /* zero would result in a div by zero later *
553 * 2^0 - 1 == 0 */
554 if (floor_setup->data.t0.amplitude_bits == 0) {
555 av_log(vc->avccontext, AV_LOG_ERROR,
556 "Floor 0 amplitude bits is 0.\n");
557 return 1;
558 }
559 floor_setup->data.t0.amplitude_offset=get_bits(gb, 8);
560 floor_setup->data.t0.num_books=get_bits(gb, 4)+1;
561
562 /* allocate mem for booklist */
563 floor_setup->data.t0.book_list=
564 av_malloc(floor_setup->data.t0.num_books);
565 if(!floor_setup->data.t0.book_list) { return 1; }
566 /* read book indexes */
567 {
568 int idx;
569 uint_fast8_t book_idx;
570 for (idx=0;idx<floor_setup->data.t0.num_books;++idx) {
571 book_idx=get_bits(gb, 8);
572 floor_setup->data.t0.book_list[idx]=book_idx;
573 if (vc->codebooks[book_idx].dimensions > max_codebook_dim)
574 max_codebook_dim=vc->codebooks[book_idx].dimensions;
575
576 if (floor_setup->data.t0.book_list[idx]>vc->codebook_count)
577 return 1;
578 }
579 }
580
581 create_map( vc, i );
582
583 /* allocate mem for lsp coefficients */
584 {
585 /* codebook dim is for padding if codebook dim doesn't *
586 * divide order+1 then we need to read more data */
587 floor_setup->data.t0.lsp=
588 av_malloc((floor_setup->data.t0.order+1 + max_codebook_dim)
589 * sizeof(float));
590 if(!floor_setup->data.t0.lsp) { return 1; }
591 }
592
593#ifdef V_DEBUG /* debug output parsed headers */
594 AV_DEBUG("floor0 order: %u\n", floor_setup->data.t0.order);
595 AV_DEBUG("floor0 rate: %u\n", floor_setup->data.t0.rate);
596 AV_DEBUG("floor0 bark map size: %u\n",
597 floor_setup->data.t0.bark_map_size);
598 AV_DEBUG("floor0 amplitude bits: %u\n",
599 floor_setup->data.t0.amplitude_bits);
600 AV_DEBUG("floor0 amplitude offset: %u\n",
601 floor_setup->data.t0.amplitude_offset);
602 AV_DEBUG("floor0 number of books: %u\n",
603 floor_setup->data.t0.num_books);
604 AV_DEBUG("floor0 book list pointer: %p\n",
605 floor_setup->data.t0.book_list);
606 {
607 int idx;
608 for (idx=0;idx<floor_setup->data.t0.num_books;++idx) {
609 AV_DEBUG( " Book %d: %u\n",
610 idx+1,
611 floor_setup->data.t0.book_list[idx] );
612 }
613 }
614#endif
615 }
616 else {
617 av_log(vc->avccontext, AV_LOG_ERROR, "Invalid floor type!\n");
618 return 1;
619 }
620 }
621 return 0;
622}
623
624// Process residues part
625
626static int vorbis_parse_setup_hdr_residues(vorbis_context *vc){
627 GetBitContext *gb=&vc->gb;
628 uint_fast8_t i, j, k;
629
630 vc->residue_count=get_bits(gb, 6)+1;
631 vc->residues=(vorbis_residue *)av_mallocz(vc->residue_count * sizeof(vorbis_residue));
632
633 AV_DEBUG(" There are %d residues. \n", vc->residue_count);
634
635 for(i=0;i<vc->residue_count;++i) {
636 vorbis_residue *res_setup=&vc->residues[i];
637 uint_fast8_t cascade[64];
638 uint_fast8_t high_bits;
639 uint_fast8_t low_bits;
640
641 res_setup->type=get_bits(gb, 16);
642
643 AV_DEBUG(" %d. residue type %d \n", i, res_setup->type);
644
645 res_setup->begin=get_bits(gb, 24);
646 res_setup->end=get_bits(gb, 24);
647 res_setup->partition_size=get_bits(gb, 24)+1;
648 res_setup->classifications=get_bits(gb, 6)+1;
649 res_setup->classbook=get_bits(gb, 8);
650
651 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,
652 res_setup->classifications, res_setup->classbook);
653
654 for(j=0;j<res_setup->classifications;++j) {
655 high_bits=0;
656 low_bits=get_bits(gb, 3);
657 if (get_bits1(gb)) {
658 high_bits=get_bits(gb, 5);
659 }
660 cascade[j]=(high_bits<<3)+low_bits;
661
662 AV_DEBUG(" %d class casscade depth: %d \n", j, ilog(cascade[j]));
663 }
664
665 res_setup->maxpass=0;
666 for(j=0;j<res_setup->classifications;++j) {
667 for(k=0;k<8;++k) {
668 if (cascade[j]&(1<<k)) {
669 res_setup->books[j][k]=get_bits(gb, 8);
670
671 AV_DEBUG(" %d class casscade depth %d book: %d \n", j, k, res_setup->books[j][k]);
672
673 if (k>res_setup->maxpass) {
674 res_setup->maxpass=k;
675 }
676 } else {
677 res_setup->books[j][k]=-1;
678 }
679 }
680 }
681 }
682 return 0;
683}
684
685// Process mappings part
686
687static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc) {
688 GetBitContext *gb=&vc->gb;
689 uint_fast8_t i, j;
690
691 vc->mapping_count=get_bits(gb, 6)+1;
692 vc->mappings=(vorbis_mapping *)av_mallocz(vc->mapping_count * sizeof(vorbis_mapping));
693
694 AV_DEBUG(" There are %d mappings. \n", vc->mapping_count);
695
696 for(i=0;i<vc->mapping_count;++i) {
697 vorbis_mapping *mapping_setup=&vc->mappings[i];
698
699 if (get_bits(gb, 16)) {
700 av_log(vc->avccontext, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n");
701 return 1;
702 }
703 if (get_bits1(gb)) {
704 mapping_setup->submaps=get_bits(gb, 4)+1;
705 } else {
706 mapping_setup->submaps=1;
707 }
708
709 if (get_bits1(gb)) {
710 mapping_setup->coupling_steps=get_bits(gb, 8)+1;
711 mapping_setup->magnitude=(uint_fast8_t *)av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
712 mapping_setup->angle=(uint_fast8_t *)av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
713 for(j=0;j<mapping_setup->coupling_steps;++j) {
714 mapping_setup->magnitude[j]=get_bits(gb, ilog(vc->audio_channels-1));
715 mapping_setup->angle[j]=get_bits(gb, ilog(vc->audio_channels-1));
716 // FIXME: sanity checks
717 }
718 } else {
719 mapping_setup->coupling_steps=0;
720 }
721
722 AV_DEBUG(" %d mapping coupling steps: %d \n", i, mapping_setup->coupling_steps);
723
724 if(get_bits(gb, 2)) {
725 av_log(vc->avccontext, AV_LOG_ERROR, "%d. mapping setup data invalid. \n", i);
726 return 1; // following spec.
727 }
728
729 if (mapping_setup->submaps>1) {
730 mapping_setup->mux=(uint_fast8_t *)av_mallocz(vc->audio_channels * sizeof(uint_fast8_t));
731 for(j=0;j<vc->audio_channels;++j) {
732 mapping_setup->mux[j]=get_bits(gb, 4);
733 }
734 }
735
736 for(j=0;j<mapping_setup->submaps;++j) {
737 get_bits(gb, 8); // FIXME check?
738 mapping_setup->submap_floor[j]=get_bits(gb, 8);
739 mapping_setup->submap_residue[j]=get_bits(gb, 8);
740
741 AV_DEBUG(" %d mapping %d submap : floor %d, residue %d \n", i, j, mapping_setup->submap_floor[j], mapping_setup->submap_residue[j]);
742 }
743 }
744 return 0;
745}
746
747// Process modes part
748
749static void create_map( vorbis_context * vc, uint_fast8_t floor_number )
750{
751 vorbis_floor * floors=vc->floors;
752 vorbis_floor0 * vf;
753 int idx;
754 int_fast8_t blockflag;
755 int_fast32_t * map;
756 int_fast32_t n; //TODO: could theoretically be smaller?
757
758 for (blockflag=0;blockflag<2;++blockflag)
759 {
760 n=(blockflag ? vc->blocksize_1 : vc->blocksize_0) / 2;
761 floors[floor_number].data.t0.map[blockflag]=
762 av_malloc((n+1) * sizeof(int_fast32_t)); // n+sentinel
763
764 map=floors[floor_number].data.t0.map[blockflag];
765 vf=&floors[floor_number].data.t0;
766
767 for (idx=0; idx<n;++idx) {
768 map[idx]=floor( BARK((vf->rate*idx)/(2.0f*n)) *
769 ((vf->bark_map_size)/
770 BARK(vf->rate/2.0f )) );
771 if (vf->bark_map_size-1 < map[idx]) {
772 map[idx]=vf->bark_map_size-1;
773 }
774 }
775 map[n]=-1;
776 vf->map_size[blockflag]=n;
777 }
778
779# ifdef V_DEBUG
780 for(idx=0;idx<=n;++idx) {
781 AV_DEBUG("floor0 map: map at pos %d is %d\n",
782 idx, map[idx]);
783 }
784# endif
785}
786
787static int vorbis_parse_setup_hdr_modes(vorbis_context *vc) {
788 GetBitContext *gb=&vc->gb;
789 uint_fast8_t i;
790
791 vc->mode_count=get_bits(gb, 6)+1;
792 vc->modes=(vorbis_mode *)av_mallocz(vc->mode_count * sizeof(vorbis_mode));
793
794 AV_DEBUG(" There are %d modes.\n", vc->mode_count);
795
796 for(i=0;i<vc->mode_count;++i) {
797 vorbis_mode *mode_setup=&vc->modes[i];
798
799 mode_setup->blockflag=get_bits(gb, 1);
800 mode_setup->windowtype=get_bits(gb, 16); //FIXME check
801 mode_setup->transformtype=get_bits(gb, 16); //FIXME check
802 mode_setup->mapping=get_bits(gb, 8); //FIXME check
803
804 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);
805 }
806 return 0;
807}
808
809// Process the whole setup header using the functions above
810
811static int vorbis_parse_setup_hdr(vorbis_context *vc) {
812 GetBitContext *gb=&vc->gb;
813
814 if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') ||
815 (get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') ||
816 (get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) {
817 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n");
818 return 1;
819 }
820
821 if (vorbis_parse_setup_hdr_codebooks(vc)) {
822 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n");
823 return 2;
824 }
825 if (vorbis_parse_setup_hdr_tdtransforms(vc)) {
826 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n");
827 return 3;
828 }
829 if (vorbis_parse_setup_hdr_floors(vc)) {
830 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n");
831 return 4;
832 }
833 if (vorbis_parse_setup_hdr_residues(vc)) {
834 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n");
835 return 5;
836 }
837 if (vorbis_parse_setup_hdr_mappings(vc)) {
838 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n");
839 return 6;
840 }
841 if (vorbis_parse_setup_hdr_modes(vc)) {
842 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n");
843 return 7;
844 }
845 if (!get_bits1(gb)) {
846 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n");
847 return 8; // framing flag bit unset error
848 }
849
850 return 0;
851}
852
853// Process the identification header
854
855static int vorbis_parse_id_hdr(vorbis_context *vc){
856 GetBitContext *gb=&vc->gb;
857 uint_fast8_t bl0, bl1;
858 const float *vwin[8]={ vwin64, vwin128, vwin256, vwin512, vwin1024, vwin2048, vwin4096, vwin8192 };
859
860 if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') ||
861 (get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') ||
862 (get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) {
863 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n");
864 return 1;
865 }
866
867 vc->version=get_bits_long_le(gb, 32); //FIXME check 0
868 vc->audio_channels=get_bits(gb, 8); //FIXME check >0
869 vc->audio_samplerate=get_bits_long_le(gb, 32); //FIXME check >0
870 vc->bitrate_maximum=get_bits_long_le(gb, 32);
871 vc->bitrate_nominal=get_bits_long_le(gb, 32);
872 vc->bitrate_minimum=get_bits_long_le(gb, 32);
873 bl0=get_bits(gb, 4);
874 bl1=get_bits(gb, 4);
875 vc->blocksize_0=(1<<bl0);
876 vc->blocksize_1=(1<<bl1);
877 if (bl0>13 || bl0<6 || bl1>13 || bl1<6 || bl1<bl0) {
878 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n");
879 return 3;
880 }
881 // output format int16
882 if (vc->blocksize_1/2 * vc->audio_channels * 2 >
883 AVCODEC_MAX_AUDIO_FRAME_SIZE) {
884 av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis channel count makes "
885 "output packets too large.\n");
886 return 4;
887 }
888 vc->swin=vwin[bl0-6];
889 vc->lwin=vwin[bl1-6];
890
891 if ((get_bits1(gb)) == 0) {
892 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n");
893 return 2;
894 }
895
896 vc->channel_residues=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
897 vc->channel_floors=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
898 vc->saved=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
899 vc->ret=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
900 vc->buf=(float *)av_malloc(vc->blocksize_1 * sizeof(float));
901 vc->buf_tmp=(float *)av_malloc(vc->blocksize_1 * sizeof(float));
902 vc->saved_start=0;
903
904 ff_mdct_init(&vc->mdct0, bl0, 1);
905 ff_mdct_init(&vc->mdct1, bl1, 1);
906
907 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 ",
908 vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize_0, vc->blocksize_1);
909
910/*
911 BLK=vc->blocksize_0;
912 for(i=0;i<BLK/2;++i) {
913 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)));
914 }
915*/
916
917 return 0;
918}
919
920// Process the extradata using the functions above (identification header, setup header)
921
922static int vorbis_decode_init(AVCodecContext *avccontext) {
923 vorbis_context *vc = avccontext->priv_data ;
924 uint8_t *headers = avccontext->extradata;
925 int headers_len=avccontext->extradata_size;
926 uint8_t *header_start[3];
927 int header_len[3];
928 GetBitContext *gb = &(vc->gb);
929 int i, j, hdr_type;
930
931 vc->avccontext = avccontext;
932
933 if (!headers_len) {
934 av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
935 return -1;
936 }
937
938 if(headers[0] == 0 && headers[1] == 30) {
939 for(i = 0; i < 3; i++){
940 header_len[i] = *headers++ << 8;
941 header_len[i] += *headers++;
942 header_start[i] = headers;
943 headers += header_len[i];
944 }
945 } else if(headers[0] == 2) {
946 for(j=1,i=0;i<2;++i, ++j) {
947 header_len[i]=0;
948 while(j<headers_len && headers[j]==0xff) {
949 header_len[i]+=0xff;
950 ++j;
951 }
952 if (j>=headers_len) {
953 av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
954 return -1;
955 }
956 header_len[i]+=headers[j];
957 }
958 header_len[2]=headers_len-header_len[0]-header_len[1]-j;
959 headers+=j;
960 header_start[0] = headers;
961 header_start[1] = header_start[0] + header_len[0];
962 header_start[2] = header_start[1] + header_len[1];
963 } else {
964 av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
965 return -1;
966 }
967
968 init_get_bits(gb, header_start[0], header_len[0]*8);
969 hdr_type=get_bits(gb, 8);
970 if (hdr_type!=1) {
971 av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n");
972 return -1;
973 }
974 if (vorbis_parse_id_hdr(vc)) {
975 av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n");
976 vorbis_free(vc);
977 return -1;
978 }
979
980 init_get_bits(gb, header_start[2], header_len[2]*8);
981 hdr_type=get_bits(gb, 8);
982 if (hdr_type!=5) {
983 av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");
984 return -1;
985 }
986 if (vorbis_parse_setup_hdr(vc)) {
987 av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");
988 vorbis_free(vc);
989 return -1;
990 }
991
992 avccontext->channels = vc->audio_channels;
993 avccontext->sample_rate = vc->audio_samplerate;
994
995 return 0 ;
996}
997
998// Decode audiopackets -------------------------------------------------
999
1000// Read and decode floor
1001
1002static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,
1003 vorbis_floor_data *vfu, float *vec) {
1004 vorbis_floor0 * vf=&vfu->t0;
1005 float * lsp=vf->lsp;
1006 uint_fast32_t amplitude;
1007 uint_fast32_t book_idx;
1008 uint_fast8_t blockflag=vc->modes[vc->mode_number].blockflag;
1009
1010 amplitude=get_bits(&vc->gb, vf->amplitude_bits);
1011 if (amplitude>0) {
1012 float last = 0;
1013 uint_fast16_t lsp_len = 0;
1014 uint_fast16_t idx;
1015 vorbis_codebook codebook;
1016
1017 book_idx=get_bits(&vc->gb, ilog(vf->num_books));
1018 if ( book_idx >= vf->num_books ) {
1019 av_log( vc->avccontext, AV_LOG_ERROR,
1020 "floor0 dec: booknumber too high!\n" );
1021 //FIXME: look above
1022 }
1023 AV_DEBUG( "floor0 dec: booknumber: %u\n", book_idx );
1024 codebook=vc->codebooks[vf->book_list[book_idx]];
1025
1026 while (lsp_len<vf->order) {
1027 int vec_off;
1028
1029 AV_DEBUG( "floor0 dec: book dimension: %d\n", codebook.dimensions );
1030 AV_DEBUG( "floor0 dec: maximum depth: %d\n", codebook.maxdepth );
1031 /* read temp vector */
1032 vec_off=get_vlc2(&vc->gb,
1033 codebook.vlc.table,
1034 codebook.nb_bits,
1035 codebook.maxdepth ) *
1036 codebook.dimensions;
1037 AV_DEBUG( "floor0 dec: vector offset: %d\n", vec_off );
1038 /* copy each vector component and add last to it */
1039 for (idx=0; idx<codebook.dimensions; ++idx) {
1040 lsp[lsp_len+idx]=codebook.codevectors[vec_off+idx]+last;
1041 }
1042 last=lsp[lsp_len+idx-1]; /* set last to last vector component */
1043
1044 lsp_len += codebook.dimensions;
1045 }
1046#ifdef V_DEBUG
1047 /* DEBUG: output lsp coeffs */
1048 {
1049 int idx;
1050 for ( idx = 0; idx < lsp_len; ++idx )
1051 AV_DEBUG("floor0 dec: coeff at %d is %f\n", idx, lsp[idx] );
1052 }
1053#endif
1054
1055 /* synthesize floor output vector */
1056 {
1057 int i;
1058 int order=vf->order;
1059 float wstep=M_PI/vf->bark_map_size;
1060
1061 for(i=0;i<order;i++) { lsp[i]=2.0f*cos(lsp[i]); }
1062
1063 AV_DEBUG("floor0 synth: map_size=%d; m=%d; wstep=%f\n",
1064 vf->map_size, order, wstep);
1065
1066 i=0;
1067 while(i<vf->map_size[blockflag]) {
1068 int j, iter_cond=vf->map[blockflag][i];
1069 float p=0.5f;
1070 float q=0.5f;
1071 float two_cos_w=2.0f*cos(wstep*iter_cond); // needed all times
1072
1073 /* similar part for the q and p products */
1074 for(j=0;j<order;j+=2) {
1075 q *= lsp[j] -two_cos_w;
1076 p *= lsp[j+1]-two_cos_w;
1077 }
1078 if(j==order) { // even order
1079 p *= p*(2.0f-two_cos_w);
1080 q *= q*(2.0f+two_cos_w);
1081 }
1082 else { // odd order
1083 q *= two_cos_w-lsp[j]; // one more time for q
1084
1085 /* final step and square */
1086 p *= p*(4.f-two_cos_w*two_cos_w);
1087 q *= q;
1088 }
1089
1090 /* calculate linear floor value */
1091 {
1092 q=exp( (
1093 ( (amplitude*vf->amplitude_offset)/
1094 (((1<<vf->amplitude_bits)-1) * sqrt(p+q)) )
1095 - vf->amplitude_offset ) * .11512925f
1096 );
1097 }
1098
1099 /* fill vector */
1100 do { vec[i]=q; ++i; }while(vf->map[blockflag][i]==iter_cond);
1101 }
1102 }
1103 }
1104 else {
1105 /* this channel is unused */
1106 return 1;
1107 }
1108
1109 AV_DEBUG(" Floor0 decoded\n");
1110
1111 return 0;
1112}
1113static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc, vorbis_floor_data *vfu, float *vec) {
1114 vorbis_floor1 * vf=&vfu->t1;
1115 GetBitContext *gb=&vc->gb;
1116 uint_fast16_t range_v[4]={ 256, 128, 86, 64 };
1117 uint_fast16_t range=range_v[vf->multiplier-1];
1118 uint_fast16_t floor1_Y[vf->x_list_dim];
1119 uint_fast16_t floor1_Y_final[vf->x_list_dim];
1120 uint_fast8_t floor1_flag[vf->x_list_dim];
1121 uint_fast8_t class_;
1122 uint_fast8_t cdim;
1123 uint_fast8_t cbits;
1124 uint_fast8_t csub;
1125 uint_fast8_t cval;
1126 int_fast16_t book;
1127 uint_fast16_t offset;
1128 uint_fast16_t i,j;
1129 uint_fast16_t *floor_x_sort=vf->x_list_order;
1130 /*u*/int_fast16_t adx, ady, off, predicted; // WTF ? dy/adx= (unsigned)dy/adx ?
1131 int_fast16_t dy, err;
1132 uint_fast16_t lx,hx, ly, hy=0;
1133
1134
1135 if (!get_bits1(gb)) return 1; // silence
1136
1137// Read values (or differences) for the floor's points
1138
1139 floor1_Y[0]=get_bits(gb, ilog(range-1));
1140 floor1_Y[1]=get_bits(gb, ilog(range-1));
1141
1142 AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);
1143
1144 offset=2;
1145 for(i=0;i<vf->partitions;++i) {
1146 class_=vf->partition_class[i];
1147 cdim=vf->class_dimensions[class_];
1148 cbits=vf->class_subclasses[class_];
1149 csub=(1<<cbits)-1;
1150 cval=0;
1151
1152 AV_DEBUG("Cbits %d \n", cbits);
1153
1154 if (cbits) { // this reads all subclasses for this partition's class
1155 cval=get_vlc2(gb, vc->codebooks[vf->class_masterbook[class_]].vlc.table,
1156 vc->codebooks[vf->class_masterbook[class_]].nb_bits, 3);
1157 }
1158
1159 for(j=0;j<cdim;++j) {
1160 book=vf->subclass_books[class_][cval & csub];
1161
1162 AV_DEBUG("book %d Cbits %d cval %d bits:%d \n", book, cbits, cval, get_bits_count(gb));
1163
1164 cval=cval>>cbits;
1165 if (book>0) {
1166 floor1_Y[offset+j]=get_vlc2(gb, vc->codebooks[book].vlc.table,
1167 vc->codebooks[book].nb_bits, 3);
1168 } else {
1169 floor1_Y[offset+j]=0;
1170 }
1171
1172 AV_DEBUG(" floor(%d) = %d \n", vf->x_list[offset+j], floor1_Y[offset+j]);
1173 }
1174 offset+=cdim;
1175 }
1176
1177// Amplitude calculation from the differences
1178
1179 floor1_flag[0]=1;
1180 floor1_flag[1]=1;
1181 floor1_Y_final[0]=floor1_Y[0];
1182 floor1_Y_final[1]=floor1_Y[1];
1183
1184 for(i=2;i<vf->x_list_dim;++i) {
1185 uint_fast16_t val, highroom, lowroom, room;
1186 uint_fast16_t high_neigh_offs;
1187 uint_fast16_t low_neigh_offs;
1188
1189 low_neigh_offs=vf->low_neighbour[i];
1190 high_neigh_offs=vf->high_neighbour[i];
1191 dy=floor1_Y_final[high_neigh_offs]-floor1_Y_final[low_neigh_offs]; // render_point begin
1192 adx=vf->x_list[high_neigh_offs]-vf->x_list[low_neigh_offs];
1193 ady= ABS(dy);
1194 err=ady*(vf->x_list[i]-vf->x_list[low_neigh_offs]);
1195 off=err/adx;
1196 if (dy<0) {
1197 predicted=floor1_Y_final[low_neigh_offs]-off;
1198 } else {
1199 predicted=floor1_Y_final[low_neigh_offs]+off;
1200 } // render_point end
1201
1202 val=floor1_Y[i];
1203 highroom=range-predicted;
1204 lowroom=predicted;
1205 if (highroom < lowroom) {
1206 room=highroom*2;
1207 } else {
1208 room=lowroom*2; // SPEC mispelling
1209 }
1210 if (val) {
1211 floor1_flag[low_neigh_offs]=1;
1212 floor1_flag[high_neigh_offs]=1;
1213 floor1_flag[i]=1;
1214 if (val>=room) {
1215 if (highroom > lowroom) {
1216 floor1_Y_final[i]=val-lowroom+predicted;
1217 } else {
1218 floor1_Y_final[i]=predicted-val+highroom-1;
1219 }
1220 } else {
1221 if (val & 1) {
1222 floor1_Y_final[i]=predicted-(val+1)/2;
1223 } else {
1224 floor1_Y_final[i]=predicted+val/2;
1225 }
1226 }
1227 } else {
1228 floor1_flag[i]=0;
1229 floor1_Y_final[i]=predicted;
1230 }
1231
1232 AV_DEBUG(" Decoded floor(%d) = %d / val %d \n", vf->x_list[i], floor1_Y_final[i], val);
1233 }
1234
1235// Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?
1236
1237 hx=0;
1238 lx=0;
1239 ly=floor1_Y_final[0]*vf->multiplier; // conforms to SPEC
1240
1241 vec[0]=floor1_inverse_db_table[ly];
1242
1243 for(i=1;i<vf->x_list_dim;++i) {
1244 AV_DEBUG(" Looking at post %d \n", i);
1245
1246 if (floor1_flag[floor_x_sort[i]]) { // SPEC mispelled
1247 int_fast16_t x, y, dy, base, sy; // if uncommented: dy = -32 adx = 2 base = 2blablabla ?????
1248
1249 hy=floor1_Y_final[floor_x_sort[i]]*vf->multiplier;
1250 hx=vf->x_list[floor_x_sort[i]];
1251
1252 dy=hy-ly;
1253 adx=hx-lx;
1254 ady= (dy<0) ? -dy:dy;//ABS(dy);
1255 base=dy/adx;
1256
1257 AV_DEBUG(" dy %d adx %d base %d = %d \n", dy, adx, base, dy/adx);
1258
1259 x=lx;
1260 y=ly;
1261 err=0;
1262 if (dy<0) {
1263 sy=base-1;
1264 } else {
1265 sy=base+1;
1266 }
1267 ady=ady-(base<0 ? -base : base)*adx;
1268 vec[x]=floor1_inverse_db_table[y];
1269
1270 AV_DEBUG(" vec[ %d ] = %d \n", x, y);
1271
1272 for(x=lx+1;(x<hx) && (x<vf->x_list[1]);++x) {
1273 err+=ady;
1274 if (err>=adx) {
1275 err-=adx;
1276 y+=sy;
1277 } else {
1278 y+=base;
1279 }
1280 vec[x]=floor1_inverse_db_table[y];
1281
1282 AV_DEBUG(" vec[ %d ] = %d \n", x, y);
1283 }
1284
1285/* for(j=1;j<hx-lx+1;++j) { // iterating render_point
1286 dy=hy-ly;
1287 adx=hx-lx;
1288 ady= dy<0 ? -dy : dy;
1289 err=ady*j;
1290 off=err/adx;
1291 if (dy<0) {
1292 predicted=ly-off;
1293 } else {
1294 predicted=ly+off;
1295 }
1296 if (lx+j < vf->x_list[1]) {
1297 vec[lx+j]=floor1_inverse_db_table[predicted];
1298 }
1299 }*/
1300
1301 lx=hx;
1302 ly=hy;
1303 }
1304 }
1305
1306 if (hx<vf->x_list[1]) {
1307 for(i=hx;i<vf->x_list[1];++i) {
1308 vec[i]=floor1_inverse_db_table[hy];
1309 }
1310 }
1311
1312 AV_DEBUG(" Floor decoded\n");
1313
1314 return 0;
1315}
1316
1317// Read and decode residue
1318
1319static 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) {
1320 GetBitContext *gb=&vc->gb;
1321 uint_fast8_t c_p_c=vc->codebooks[vr->classbook].dimensions;
1322 uint_fast16_t n_to_read=vr->end-vr->begin;
1323 uint_fast16_t ptns_to_read=n_to_read/vr->partition_size;
1324 uint_fast8_t classifs[ptns_to_read*vc->audio_channels];
1325 uint_fast8_t pass;
1326 uint_fast8_t ch_used;
1327 uint_fast8_t i,j,l;
1328 uint_fast16_t k;
1329
1330 if (vr->type==2) {
1331 for(j=1;j<ch;++j) {
1332 do_not_decode[0]&=do_not_decode[j]; // FIXME - clobbering input
1333 }
1334 if (do_not_decode[0]) return 0;
1335 ch_used=1;
1336 } else {
1337 ch_used=ch;
1338 }
1339
1340 AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d cpc %d \n", ch, c_p_c);
1341
1342 for(pass=0;pass<=vr->maxpass;++pass) { // FIXME OPTIMIZE?
1343 uint_fast16_t voffset;
1344 uint_fast16_t partition_count;
1345 uint_fast16_t j_times_ptns_to_read;
1346
1347 voffset=vr->begin;
1348 for(partition_count=0;partition_count<ptns_to_read;) { // SPEC error
1349 if (!pass) {
1350 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {
1351 if (!do_not_decode[j]) {
1352 uint_fast32_t temp=get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,
1353 vc->codebooks[vr->classbook].nb_bits, 3);
1354
1355 AV_DEBUG("Classword: %d \n", temp);
1356
1357 assert(vr->classifications > 1 && temp<=65536); //needed for inverse[]
1358 for(i=0;i<c_p_c;++i) {
1359 uint_fast32_t temp2;
1360
1361 temp2=(((uint_fast64_t)temp) * inverse[vr->classifications])>>32;
1362 if (partition_count+c_p_c-1-i < ptns_to_read) {
1363 classifs[j_times_ptns_to_read+partition_count+c_p_c-1-i]=temp-temp2*vr->classifications;
1364 }
1365 temp=temp2;
1366 }
1367 }
1368 j_times_ptns_to_read+=ptns_to_read;
1369 }
1370 }
1371 for(i=0;(i<c_p_c) && (partition_count<ptns_to_read);++i) {
1372 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {
1373 uint_fast16_t voffs;
1374
1375 if (!do_not_decode[j]) {
1376 uint_fast8_t vqclass=classifs[j_times_ptns_to_read+partition_count];
1377 int_fast16_t vqbook=vr->books[vqclass][pass];
1378
1379 if (vqbook>=0) {
1380 uint_fast16_t coffs;
1381 uint_fast16_t step=vr->partition_size/vc->codebooks[vqbook].dimensions;
1382 vorbis_codebook codebook= vc->codebooks[vqbook];
1383
1384 if (vr->type==0) {
1385
1386 voffs=voffset+j*vlen;
1387 for(k=0;k<step;++k) {
1388 coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * codebook.dimensions;
1389 for(l=0;l<codebook.dimensions;++l) {
1390 vec[voffs+k+l*step]+=codebook.codevectors[coffs+l]; // FPMATH
1391 }
1392 }
1393 }
1394 else if (vr->type==1) {
1395 voffs=voffset+j*vlen;
1396 for(k=0;k<step;++k) {
1397 coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * codebook.dimensions;
1398 for(l=0;l<codebook.dimensions;++l, ++voffs) {
1399 vec[voffs]+=codebook.codevectors[coffs+l]; // FPMATH
1400
1401 AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d \n", pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);
1402 }
1403 }
1404 }
1405 else if (vr->type==2 && ch==2 && (voffset&1)==0 && (codebook.dimensions&1)==0) { // most frequent case optimized
1406 voffs=voffset>>1;
1407
1408 for(k=0;k<step;++k) {
1409 coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * codebook.dimensions;
1410 for(l=0;l<codebook.dimensions;l+=2, voffs++) {
1411 vec[voffs ]+=codebook.codevectors[coffs+l ]; // FPMATH
1412 vec[voffs+vlen]+=codebook.codevectors[coffs+l+1]; // FPMATH
1413
1414 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);
1415 }
1416 }
1417
1418 }
1419 else if (vr->type==2) {
1420 voffs=voffset;
1421
1422 for(k=0;k<step;++k) {
1423 coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * codebook.dimensions;
1424 for(l=0;l<codebook.dimensions;++l, ++voffs) {
1425 vec[voffs/ch+(voffs%ch)*vlen]+=codebook.codevectors[coffs+l]; // FPMATH FIXME use if and counter instead of / and %
1426
1427 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);
1428 }
1429 }
1430 } else {
1431 av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");
1432 return 1;
1433 }
1434 }
1435 }
1436 j_times_ptns_to_read+=ptns_to_read;
1437 }
1438 ++partition_count;
1439 voffset+=vr->partition_size;
1440 }
1441 }
1442 }
1443 return 0;
1444}
1445
1446// Decode the audio packet using the functions above
1447#define BIAS 385
1448
1449static int vorbis_parse_audio_packet(vorbis_context *vc) {
1450 GetBitContext *gb=&vc->gb;
1451
1452 uint_fast8_t previous_window=0,next_window=0;
1453 uint_fast8_t mode_number;
1454 uint_fast16_t blocksize;
1455 int_fast32_t i,j;
1456 uint_fast8_t no_residue[vc->audio_channels];
1457 uint_fast8_t do_not_decode[vc->audio_channels];
1458 vorbis_mapping *mapping;
1459 float *ch_res_ptr=vc->channel_residues;
1460 float *ch_floor_ptr=vc->channel_floors;
1461 uint_fast8_t res_chan[vc->audio_channels];
1462 uint_fast8_t res_num=0;
1463 int_fast16_t retlen=0;
1464 uint_fast16_t saved_start=0;
1465
1466 if (get_bits1(gb)) {
1467 av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");
1468 return -1; // packet type not audio
1469 }
1470
1471 if (vc->mode_count==1) {
1472 mode_number=0;
1473 } else {
1474 mode_number=get_bits(gb, ilog(vc->mode_count-1));
1475 }
1476 vc->mode_number=mode_number;
1477 mapping=&vc->mappings[vc->modes[mode_number].mapping];
1478
1479 AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);
1480
1481 if (vc->modes[mode_number].blockflag) {
1482 previous_window=get_bits1(gb);
1483 next_window=get_bits1(gb);
1484 }
1485
1486 blocksize=vc->modes[mode_number].blockflag ? vc->blocksize_1 : vc->blocksize_0;
1487 memset(ch_res_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?
1488 memset(ch_floor_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?
1489
1490// Decode floor
1491
1492 for(i=0;i<vc->audio_channels;++i) {
1493 vorbis_floor *floor;
1494 if (mapping->submaps>1) {
1495 floor=&vc->floors[mapping->submap_floor[mapping->mux[i]]];
1496 } else {
1497 floor=&vc->floors[mapping->submap_floor[0]];
1498 }
1499
1500 no_residue[i]=floor->decode(vc, &floor->data, ch_floor_ptr);
1501 ch_floor_ptr+=blocksize/2;
1502 }
1503
1504// Nonzero vector propagate
1505
1506 for(i=mapping->coupling_steps-1;i>=0;--i) {
1507 if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {
1508 no_residue[mapping->magnitude[i]]=0;
1509 no_residue[mapping->angle[i]]=0;
1510 }
1511 }
1512
1513// Decode residue
1514
1515 for(i=0;i<mapping->submaps;++i) {
1516 vorbis_residue *residue;
1517 uint_fast8_t ch=0;
1518
1519 for(j=0;j<vc->audio_channels;++j) {
1520 if ((mapping->submaps==1) || (i=mapping->mux[j])) {
1521 res_chan[j]=res_num;
1522 if (no_residue[j]) {
1523 do_not_decode[ch]=1;
1524 } else {
1525 do_not_decode[ch]=0;
1526 }
1527 ++ch;
1528 ++res_num;
1529 }
1530 }
1531 residue=&vc->residues[mapping->submap_residue[i]];
1532 vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);
1533
1534 ch_res_ptr+=ch*blocksize/2;
1535 }
1536
1537// Inverse coupling
1538
1539 for(i=mapping->coupling_steps-1;i>=0;--i) { //warning: i has to be signed
1540 float *mag, *ang;
1541
1542 mag=vc->channel_residues+res_chan[mapping->magnitude[i]]*blocksize/2;
1543 ang=vc->channel_residues+res_chan[mapping->angle[i]]*blocksize/2;
1544 for(j=0;j<blocksize/2;++j) {
1545 float temp;
1546 if (mag[j]>0.0) {
1547 if (ang[j]>0.0) {
1548 ang[j]=mag[j]-ang[j];
1549 } else {
1550 temp=ang[j];
1551 ang[j]=mag[j];
1552 mag[j]+=temp;
1553 }
1554 } else {
1555 if (ang[j]>0.0) {
1556 ang[j]+=mag[j];
1557 } else {
1558 temp=ang[j];
1559 ang[j]=mag[j];
1560 mag[j]-=temp;
1561 }
1562 }
1563 }
1564 }
1565
1566// Dotproduct
1567
1568 for(j=0, ch_floor_ptr=vc->channel_floors;j<vc->audio_channels;++j,ch_floor_ptr+=blocksize/2) {
1569 ch_res_ptr=vc->channel_residues+res_chan[j]*blocksize/2;
1570
1571 for(i=0;i<blocksize/2;++i) {
1572 ch_floor_ptr[i]*=ch_res_ptr[i]; //FPMATH
1573 }
1574 }
1575
1576// MDCT, overlap/add, save data for next overlapping FPMATH
1577
1578 for(j=0;j<vc->audio_channels;++j) {
1579 uint_fast8_t step=vc->audio_channels;
1580 uint_fast16_t k;
1581 float *saved=vc->saved+j*vc->blocksize_1/2;
1582 float *ret=vc->ret;
1583 const float *lwin=vc->lwin;
1584 const float *swin=vc->swin;
1585 float *buf=vc->buf;
1586 float *buf_tmp=vc->buf_tmp;
1587
1588 ch_floor_ptr=vc->channel_floors+j*blocksize/2;
1589
1590 saved_start=vc->saved_start;
1591
1592 ff_imdct_calc(vc->modes[mode_number].blockflag ? &vc->mdct1 : &vc->mdct0, buf, ch_floor_ptr, buf_tmp);
1593
1594 if (vc->modes[mode_number].blockflag) {
1595 // -- overlap/add
1596 if (previous_window) {
1597 for(k=j, i=0;i<vc->blocksize_1/2;++i, k+=step) {
1598 ret[k]=saved[i]+buf[i]*lwin[i]+BIAS;
1599 }
1600 retlen=vc->blocksize_1/2;
1601 } else {
1602 buf += (vc->blocksize_1-vc->blocksize_0)/4;
1603 for(k=j, i=0;i<vc->blocksize_0/2;++i, k+=step) {
1604 ret[k]=saved[i]+buf[i]*swin[i]+BIAS;
1605 }
1606 buf += vc->blocksize_0/2;
1607 for(i=0;i<(vc->blocksize_1-vc->blocksize_0)/4;++i, k+=step) {
1608 ret[k]=buf[i]+BIAS;
1609 }
1610 buf=vc->buf;
1611 retlen=vc->blocksize_0/2+(vc->blocksize_1-vc->blocksize_0)/4;
1612 }
1613 // -- save
1614 if (next_window) {
1615 buf += vc->blocksize_1/2;
1616 lwin += vc->blocksize_1/2-1;
1617 for(i=0;i<vc->blocksize_1/2;++i) {
1618 saved[i]=buf[i]*lwin[-i];
1619 }
1620 saved_start=0;
1621 } else {
1622 saved_start=(vc->blocksize_1-vc->blocksize_0)/4;
1623 buf += vc->blocksize_1/2;
1624 for(i=0;i<saved_start;++i) {
1625 saved[i]=buf[i];
1626 }
1627 swin += vc->blocksize_0/2-1;
1628 for(i=0;i<vc->blocksize_0/2;++i) {
1629 saved[saved_start+i]=buf[saved_start+i]*swin[-i];
1630 }
1631 }
1632 } else {
1633 // --overlap/add
1634 for(k=j, i=0;i<saved_start;++i, k+=step) {
1635 ret[k]=saved[i]+BIAS;
1636 }
1637 for(i=0;i<vc->blocksize_0/2;++i, k+=step) {
1638 ret[k]=saved[saved_start+i]+buf[i]*swin[i]+BIAS;
1639 }
1640 retlen=saved_start+vc->blocksize_0/2;
1641 // -- save
1642 buf += vc->blocksize_0/2;
1643 swin += vc->blocksize_0/2-1;
1644 for(i=0;i<vc->blocksize_0/2;++i) {
1645 saved[i]=buf[i]*swin[-i];
1646 }
1647 saved_start=0;
1648 }
1649 }
1650 vc->saved_start=saved_start;
1651
1652 return retlen*vc->audio_channels;
1653}
1654
1655// Return the decoded audio packet through the standard api
1656
1657static int vorbis_decode_frame(AVCodecContext *avccontext,
1658 void *data, int *data_size,
1659 uint8_t *buf, int buf_size)
1660{
1661 vorbis_context *vc = avccontext->priv_data ;
1662 GetBitContext *gb = &(vc->gb);
1663
1664 int_fast16_t i, len;
1665
1666 if(!buf_size){
1667 return 0;
1668 }
1669
1670 AV_DEBUG("packet length %d \n", buf_size);
1671
1672 init_get_bits(gb, buf, buf_size*8);
1673
1674 len=vorbis_parse_audio_packet(vc);
1675
1676 if (len<=0) {
1677 *data_size=0;
1678 return buf_size;
1679 }
1680
1681 if (!vc->first_frame) {
1682 vc->first_frame=1;
1683 *data_size=0;
1684 return buf_size ;
1685 }
1686
1687 AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);
1688
1689 for(i=0;i<len;++i) {
1690 int_fast32_t tmp= ((int32_t*)vc->ret)[i];
1691 if(tmp & 0xf0000){
1692// tmp= (0x43c0ffff - tmp)>>31; //ask gcc devs why this is slower
1693 if(tmp > 0x43c0ffff) tmp= 0xFFFF;
1694 else tmp= 0;
1695 }
1696 ((int16_t*)data)[i]=tmp - 0x8000;
1697 }
1698
1699 *data_size=len*2;
1700
1701 return buf_size ;
1702}
1703
1704// Close decoder
1705
1706static int vorbis_decode_close(AVCodecContext *avccontext) {
1707 vorbis_context *vc = avccontext->priv_data;
1708
1709 vorbis_free(vc);
1710
1711 return 0 ;
1712}
1713
1714AVCodec vorbis_decoder = {
1715 "vorbis",
1716 CODEC_TYPE_AUDIO,
1717 CODEC_ID_VORBIS,
1718 sizeof(vorbis_context),
1719 vorbis_decode_init,
1720 NULL,
1721 vorbis_decode_close,
1722 vorbis_decode_frame,
1723};
1724
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