rename vorbis.c to vorbis_dec.c and vorbis_common.c to vorbis.c
[libav.git] / libavcodec / vorbis_dec.c
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AJ
1/**
2 * @file vorbis_dec.c
3 * Vorbis I decoder
4 * @author Denes Balatoni ( dbalatoni programozo hu )
5
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 *
22 */
23
24#undef V_DEBUG
25//#define V_DEBUG
26//#define AV_DEBUG(...) av_log(NULL, AV_LOG_INFO, __VA_ARGS__)
27
28#include <math.h>
29
30#define ALT_BITSTREAM_READER_LE
31#include "avcodec.h"
32#include "bitstream.h"
33#include "dsputil.h"
34
35#include "vorbis.h"
36#include "xiph.h"
37
38#define V_NB_BITS 8
39#define V_NB_BITS2 11
40#define V_MAX_VLCS (1<<16)
41
42#ifndef V_DEBUG
43#define AV_DEBUG(...)
44#endif
45
46#undef NDEBUG
47#include <assert.h>
48
49typedef struct {
50 uint_fast8_t dimensions;
51 uint_fast8_t lookup_type;
52 uint_fast8_t maxdepth;
53 VLC vlc;
54 float *codevectors;
55 unsigned int nb_bits;
56} vorbis_codebook;
57
58typedef union vorbis_floor_u vorbis_floor_data;
59typedef struct vorbis_floor0_s vorbis_floor0;
60typedef struct vorbis_floor1_s vorbis_floor1;
61struct vorbis_context_s;
62typedef
63uint_fast8_t (* vorbis_floor_decode_func)
64 (struct vorbis_context_s *, vorbis_floor_data *, float *);
65typedef struct {
66 uint_fast8_t floor_type;
67 vorbis_floor_decode_func decode;
68 union vorbis_floor_u
69 {
70 struct vorbis_floor0_s
71 {
72 uint_fast8_t order;
73 uint_fast16_t rate;
74 uint_fast16_t bark_map_size;
75 int_fast32_t * map[2];
76 uint_fast32_t map_size[2];
77 uint_fast8_t amplitude_bits;
78 uint_fast8_t amplitude_offset;
79 uint_fast8_t num_books;
80 uint_fast8_t * book_list;
81 float * lsp;
82 } t0;
83 struct vorbis_floor1_s
84 {
85 uint_fast8_t partitions;
86 uint_fast8_t maximum_class;
87 uint_fast8_t partition_class[32];
88 uint_fast8_t class_dimensions[16];
89 uint_fast8_t class_subclasses[16];
90 uint_fast8_t class_masterbook[16];
91 int_fast16_t subclass_books[16][8];
92 uint_fast8_t multiplier;
93 uint_fast16_t x_list_dim;
94 floor1_entry_t * list;
95 } t1;
96 } data;
97} vorbis_floor;
98
99typedef struct {
100 uint_fast16_t type;
101 uint_fast32_t begin;
102 uint_fast32_t end;
103 uint_fast32_t partition_size;
104 uint_fast8_t classifications;
105 uint_fast8_t classbook;
106 int_fast16_t books[64][8];
107 uint_fast8_t maxpass;
108} vorbis_residue;
109
110typedef struct {
111 uint_fast8_t submaps;
112 uint_fast16_t coupling_steps;
113 uint_fast8_t *magnitude;
114 uint_fast8_t *angle;
115 uint_fast8_t *mux;
116 uint_fast8_t submap_floor[16];
117 uint_fast8_t submap_residue[16];
118} vorbis_mapping;
119
120typedef struct {
121 uint_fast8_t blockflag;
122 uint_fast16_t windowtype;
123 uint_fast16_t transformtype;
124 uint_fast8_t mapping;
125} vorbis_mode;
126
127typedef struct vorbis_context_s {
128 AVCodecContext *avccontext;
129 GetBitContext gb;
130 DSPContext dsp;
131
132 MDCTContext mdct[2];
133 uint_fast8_t first_frame;
134 uint_fast32_t version;
135 uint_fast8_t audio_channels;
136 uint_fast32_t audio_samplerate;
137 uint_fast32_t bitrate_maximum;
138 uint_fast32_t bitrate_nominal;
139 uint_fast32_t bitrate_minimum;
140 uint_fast32_t blocksize[2];
141 const float * win[2];
142 uint_fast16_t codebook_count;
143 vorbis_codebook *codebooks;
144 uint_fast8_t floor_count;
145 vorbis_floor *floors;
146 uint_fast8_t residue_count;
147 vorbis_residue *residues;
148 uint_fast8_t mapping_count;
149 vorbis_mapping *mappings;
150 uint_fast8_t mode_count;
151 vorbis_mode *modes;
152 uint_fast8_t mode_number; // mode number for the current packet
153 float *channel_residues;
154 float *channel_floors;
155 float *saved;
156 uint_fast16_t saved_start;
157 float *ret;
158 float *buf;
159 float *buf_tmp;
160 uint_fast32_t add_bias; // for float->int conversion
161 uint_fast32_t exp_bias;
162} vorbis_context;
163
164/* Helper functions */
165
166#define BARK(x) \
167 (13.1f*atan(0.00074f*(x))+2.24f*atan(1.85e-8f*(x)*(x))+1e-4f*(x))
168
169static float vorbisfloat2float(uint_fast32_t val) {
170 double mant=val&0x1fffff;
171 long exp=(val&0x7fe00000L)>>21;
172 if (val&0x80000000) mant=-mant;
173 return(ldexp(mant, exp-20-768));
174}
175
176
177// Free all allocated memory -----------------------------------------
178
179static void vorbis_free(vorbis_context *vc) {
180 int_fast16_t i;
181
182 av_freep(&vc->channel_residues);
183 av_freep(&vc->channel_floors);
184 av_freep(&vc->saved);
185 av_freep(&vc->ret);
186 av_freep(&vc->buf);
187 av_freep(&vc->buf_tmp);
188
189 av_freep(&vc->residues);
190 av_freep(&vc->modes);
191
192 ff_mdct_end(&vc->mdct[0]);
193 ff_mdct_end(&vc->mdct[1]);
194
195 for(i=0;i<vc->codebook_count;++i) {
196 av_free(vc->codebooks[i].codevectors);
197 free_vlc(&vc->codebooks[i].vlc);
198 }
199 av_freep(&vc->codebooks);
200
201 for(i=0;i<vc->floor_count;++i) {
202 if(vc->floors[i].floor_type==0) {
203 av_free(vc->floors[i].data.t0.map[0]);
204 av_free(vc->floors[i].data.t0.map[1]);
205 av_free(vc->floors[i].data.t0.book_list);
206 av_free(vc->floors[i].data.t0.lsp);
207 }
208 else {
209 av_free(vc->floors[i].data.t1.list);
210 }
211 }
212 av_freep(&vc->floors);
213
214 for(i=0;i<vc->mapping_count;++i) {
215 av_free(vc->mappings[i].magnitude);
216 av_free(vc->mappings[i].angle);
217 av_free(vc->mappings[i].mux);
218 }
219 av_freep(&vc->mappings);
220
221 if(vc->exp_bias){
222 av_freep(&vc->win[0]);
223 av_freep(&vc->win[1]);
224 }
225}
226
227// Parse setup header -------------------------------------------------
228
229// Process codebooks part
230
231static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc) {
232 uint_fast16_t cb;
233 uint8_t *tmp_vlc_bits;
234 uint32_t *tmp_vlc_codes;
235 GetBitContext *gb=&vc->gb;
236
237 vc->codebook_count=get_bits(gb,8)+1;
238
239 AV_DEBUG(" Codebooks: %d \n", vc->codebook_count);
240
241 vc->codebooks=(vorbis_codebook *)av_mallocz(vc->codebook_count * sizeof(vorbis_codebook));
242 tmp_vlc_bits=(uint8_t *)av_mallocz(V_MAX_VLCS * sizeof(uint8_t));
243 tmp_vlc_codes=(uint32_t *)av_mallocz(V_MAX_VLCS * sizeof(uint32_t));
244
245 for(cb=0;cb<vc->codebook_count;++cb) {
246 vorbis_codebook *codebook_setup=&vc->codebooks[cb];
247 uint_fast8_t ordered;
248 uint_fast32_t t, used_entries=0;
249 uint_fast32_t entries;
250
251 AV_DEBUG(" %d. Codebook \n", cb);
252
253 if (get_bits(gb, 24)!=0x564342) {
254 av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook setup data corrupt. \n", cb);
255 goto error;
256 }
257
258 codebook_setup->dimensions=get_bits(gb, 16);
259 if (codebook_setup->dimensions>16) {
260 av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook's dimension is too large (%d). \n", cb, codebook_setup->dimensions);
261 goto error;
262 }
263 entries=get_bits(gb, 24);
264 if (entries>V_MAX_VLCS) {
265 av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook has too many entries (%"PRIdFAST32"). \n", cb, entries);
266 goto error;
267 }
268
269 ordered=get_bits1(gb);
270
271 AV_DEBUG(" codebook_dimensions %d, codebook_entries %d \n", codebook_setup->dimensions, entries);
272
273 if (!ordered) {
274 uint_fast16_t ce;
275 uint_fast8_t flag;
276 uint_fast8_t sparse=get_bits1(gb);
277
278 AV_DEBUG(" not ordered \n");
279
280 if (sparse) {
281 AV_DEBUG(" sparse \n");
282
283 used_entries=0;
284 for(ce=0;ce<entries;++ce) {
285 flag=get_bits1(gb);
286 if (flag) {
287 tmp_vlc_bits[ce]=get_bits(gb, 5)+1;
288 ++used_entries;
289 }
290 else tmp_vlc_bits[ce]=0;
291 }
292 } else {
293 AV_DEBUG(" not sparse \n");
294
295 used_entries=entries;
296 for(ce=0;ce<entries;++ce) {
297 tmp_vlc_bits[ce]=get_bits(gb, 5)+1;
298 }
299 }
300 } else {
301 uint_fast16_t current_entry=0;
302 uint_fast8_t current_length=get_bits(gb, 5)+1;
303
304 AV_DEBUG(" ordered, current length: %d \n", current_length); //FIXME
305
306 used_entries=entries;
307 for(;current_entry<used_entries;++current_length) {
308 uint_fast16_t i, number;
309
310 AV_DEBUG(" number bits: %d ", ilog(entries - current_entry));
311
312 number=get_bits(gb, ilog(entries - current_entry));
313
314 AV_DEBUG(" number: %d \n", number);
315
316 for(i=current_entry;i<number+current_entry;++i) {
317 if (i<used_entries) tmp_vlc_bits[i]=current_length;
318 }
319
320 current_entry+=number;
321 }
322 if (current_entry>used_entries) {
323 av_log(vc->avccontext, AV_LOG_ERROR, " More codelengths than codes in codebook. \n");
324 goto error;
325 }
326 }
327
328 codebook_setup->lookup_type=get_bits(gb, 4);
329
330 AV_DEBUG(" lookup type: %d : %s \n", codebook_setup->lookup_type, codebook_setup->lookup_type ? "vq" : "no lookup" );
331
332// If the codebook is used for (inverse) VQ, calculate codevectors.
333
334 if (codebook_setup->lookup_type==1) {
335 uint_fast16_t i, j, k;
336 uint_fast16_t codebook_lookup_values=ff_vorbis_nth_root(entries, codebook_setup->dimensions);
337 uint_fast16_t codebook_multiplicands[codebook_lookup_values];
338
339 float codebook_minimum_value=vorbisfloat2float(get_bits_long(gb, 32));
340 float codebook_delta_value=vorbisfloat2float(get_bits_long(gb, 32));
341 uint_fast8_t codebook_value_bits=get_bits(gb, 4)+1;
342 uint_fast8_t codebook_sequence_p=get_bits1(gb);
343
344 AV_DEBUG(" We expect %d numbers for building the codevectors. \n", codebook_lookup_values);
345 AV_DEBUG(" delta %f minmum %f \n", codebook_delta_value, codebook_minimum_value);
346
347 for(i=0;i<codebook_lookup_values;++i) {
348 codebook_multiplicands[i]=get_bits(gb, codebook_value_bits);
349
350 AV_DEBUG(" multiplicands*delta+minmum : %e \n", (float)codebook_multiplicands[i]*codebook_delta_value+codebook_minimum_value);
351 AV_DEBUG(" multiplicand %d \n", codebook_multiplicands[i]);
352 }
353
354// Weed out unused vlcs and build codevector vector
355 codebook_setup->codevectors=(float *)av_mallocz(used_entries*codebook_setup->dimensions * sizeof(float));
356 for(j=0, i=0;i<entries;++i) {
357 uint_fast8_t dim=codebook_setup->dimensions;
358
359 if (tmp_vlc_bits[i]) {
360 float last=0.0;
361 uint_fast32_t lookup_offset=i;
362
363#ifdef V_DEBUG
364 av_log(vc->avccontext, AV_LOG_INFO, "Lookup offset %d ,", i);
365#endif
366
367 for(k=0;k<dim;++k) {
368 uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values;
369 codebook_setup->codevectors[j*dim+k]=codebook_multiplicands[multiplicand_offset]*codebook_delta_value+codebook_minimum_value+last;
370 if (codebook_sequence_p) {
371 last=codebook_setup->codevectors[j*dim+k];
372 }
373 lookup_offset/=codebook_lookup_values;
374 }
375 tmp_vlc_bits[j]=tmp_vlc_bits[i];
376
377#ifdef V_DEBUG
378 av_log(vc->avccontext, AV_LOG_INFO, "real lookup offset %d, vector: ", j);
379 for(k=0;k<dim;++k) {
380 av_log(vc->avccontext, AV_LOG_INFO, " %f ", codebook_setup->codevectors[j*dim+k]);
381 }
382 av_log(vc->avccontext, AV_LOG_INFO, "\n");
383#endif
384
385 ++j;
386 }
387 }
388 if (j!=used_entries) {
389 av_log(vc->avccontext, AV_LOG_ERROR, "Bug in codevector vector building code. \n");
390 goto error;
391 }
392 entries=used_entries;
393 }
394 else if (codebook_setup->lookup_type>=2) {
395 av_log(vc->avccontext, AV_LOG_ERROR, "Codebook lookup type not supported. \n");
396 goto error;
397 }
398
399// Initialize VLC table
400 if (ff_vorbis_len2vlc(tmp_vlc_bits, tmp_vlc_codes, entries)) {
401 av_log(vc->avccontext, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");
402 goto error;
403 }
404 codebook_setup->maxdepth=0;
405 for(t=0;t<entries;++t)
406 if (tmp_vlc_bits[t]>=codebook_setup->maxdepth) codebook_setup->maxdepth=tmp_vlc_bits[t];
407
408 if(codebook_setup->maxdepth > 3*V_NB_BITS) codebook_setup->nb_bits=V_NB_BITS2;
409 else codebook_setup->nb_bits=V_NB_BITS;
410
411 codebook_setup->maxdepth=(codebook_setup->maxdepth+codebook_setup->nb_bits-1)/codebook_setup->nb_bits;
412
413 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)) {
414 av_log(vc->avccontext, AV_LOG_ERROR, " Error generating vlc tables. \n");
415 goto error;
416 }
417 }
418
419 av_free(tmp_vlc_bits);
420 av_free(tmp_vlc_codes);
421 return 0;
422
423// Error:
424error:
425 av_free(tmp_vlc_bits);
426 av_free(tmp_vlc_codes);
427 return 1;
428}
429
430// Process time domain transforms part (unused in Vorbis I)
431
432static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc) {
433 GetBitContext *gb=&vc->gb;
434 uint_fast8_t i;
435 uint_fast8_t vorbis_time_count=get_bits(gb, 6)+1;
436
437 for(i=0;i<vorbis_time_count;++i) {
438 uint_fast16_t vorbis_tdtransform=get_bits(gb, 16);
439
440 AV_DEBUG(" Vorbis time domain transform %d: %d \n", vorbis_time_count, vorbis_tdtransform);
441
442 if (vorbis_tdtransform) {
443 av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n");
444 return 1;
445 }
446 }
447 return 0;
448}
449
450// Process floors part
451
452static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,
453 vorbis_floor_data *vfu, float *vec);
454static void create_map( vorbis_context * vc, uint_fast8_t floor_number );
455static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc,
456 vorbis_floor_data *vfu, float *vec);
457static int vorbis_parse_setup_hdr_floors(vorbis_context *vc) {
458 GetBitContext *gb=&vc->gb;
459 uint_fast16_t i,j,k;
460
461 vc->floor_count=get_bits(gb, 6)+1;
462
463 vc->floors=(vorbis_floor *)av_mallocz(vc->floor_count * sizeof(vorbis_floor));
464
465 for (i=0;i<vc->floor_count;++i) {
466 vorbis_floor *floor_setup=&vc->floors[i];
467
468 floor_setup->floor_type=get_bits(gb, 16);
469
470 AV_DEBUG(" %d. floor type %d \n", i, floor_setup->floor_type);
471
472 if (floor_setup->floor_type==1) {
473 uint_fast8_t maximum_class=0;
474 uint_fast8_t rangebits;
475 uint_fast16_t floor1_values=2;
476
477 floor_setup->decode=vorbis_floor1_decode;
478
479 floor_setup->data.t1.partitions=get_bits(gb, 5);
480
481 AV_DEBUG(" %d.floor: %d partitions \n", i, floor_setup->data.t1.partitions);
482
483 for(j=0;j<floor_setup->data.t1.partitions;++j) {
484 floor_setup->data.t1.partition_class[j]=get_bits(gb, 4);
485 if (floor_setup->data.t1.partition_class[j]>maximum_class) maximum_class=floor_setup->data.t1.partition_class[j];
486
487 AV_DEBUG(" %d. floor %d partition class %d \n", i, j, floor_setup->data.t1.partition_class[j]);
488
489 }
490
491 AV_DEBUG(" maximum class %d \n", maximum_class);
492
493 floor_setup->data.t1.maximum_class=maximum_class;
494
495 for(j=0;j<=maximum_class;++j) {
496 floor_setup->data.t1.class_dimensions[j]=get_bits(gb, 3)+1;
497 floor_setup->data.t1.class_subclasses[j]=get_bits(gb, 2);
498
499 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]);
500
501 if (floor_setup->data.t1.class_subclasses[j]) {
502 floor_setup->data.t1.class_masterbook[j]=get_bits(gb, 8);
503
504 AV_DEBUG(" masterbook: %d \n", floor_setup->data.t1.class_masterbook[j]);
505 }
506
507 for(k=0;k<(1<<floor_setup->data.t1.class_subclasses[j]);++k) {
508 floor_setup->data.t1.subclass_books[j][k]=(int16_t)get_bits(gb, 8)-1;
509
510 AV_DEBUG(" book %d. : %d \n", k, floor_setup->data.t1.subclass_books[j][k]);
511 }
512 }
513
514 floor_setup->data.t1.multiplier=get_bits(gb, 2)+1;
515 floor_setup->data.t1.x_list_dim=2;
516
517 for(j=0;j<floor_setup->data.t1.partitions;++j) {
518 floor_setup->data.t1.x_list_dim+=floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];
519 }
520
521 floor_setup->data.t1.list=(floor1_entry_t *)av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(floor1_entry_t));
522
523
524 rangebits=get_bits(gb, 4);
525 floor_setup->data.t1.list[0].x = 0;
526 floor_setup->data.t1.list[1].x = (1<<rangebits);
527
528 for(j=0;j<floor_setup->data.t1.partitions;++j) {
529 for(k=0;k<floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];++k,++floor1_values) {
530 floor_setup->data.t1.list[floor1_values].x=get_bits(gb, rangebits);
531
532 AV_DEBUG(" %d. floor1 Y coord. %d \n", floor1_values, floor_setup->data.t1.list[floor1_values].x);
533 }
534 }
535
536// Precalculate order of x coordinates - needed for decode
537 ff_vorbis_ready_floor1_list(floor_setup->data.t1.list, floor_setup->data.t1.x_list_dim);
538 }
539 else if(floor_setup->floor_type==0) {
540 uint_fast8_t max_codebook_dim=0;
541
542 floor_setup->decode=vorbis_floor0_decode;
543
544 floor_setup->data.t0.order=get_bits(gb, 8);
545 floor_setup->data.t0.rate=get_bits(gb, 16);
546 floor_setup->data.t0.bark_map_size=get_bits(gb, 16);
547 floor_setup->data.t0.amplitude_bits=get_bits(gb, 6);
548 /* zero would result in a div by zero later *
549 * 2^0 - 1 == 0 */
550 if (floor_setup->data.t0.amplitude_bits == 0) {
551 av_log(vc->avccontext, AV_LOG_ERROR,
552 "Floor 0 amplitude bits is 0.\n");
553 return 1;
554 }
555 floor_setup->data.t0.amplitude_offset=get_bits(gb, 8);
556 floor_setup->data.t0.num_books=get_bits(gb, 4)+1;
557
558 /* allocate mem for booklist */
559 floor_setup->data.t0.book_list=
560 av_malloc(floor_setup->data.t0.num_books);
561 if(!floor_setup->data.t0.book_list) { return 1; }
562 /* read book indexes */
563 {
564 int idx;
565 uint_fast8_t book_idx;
566 for (idx=0;idx<floor_setup->data.t0.num_books;++idx) {
567 book_idx=get_bits(gb, 8);
568 floor_setup->data.t0.book_list[idx]=book_idx;
569 if (vc->codebooks[book_idx].dimensions > max_codebook_dim)
570 max_codebook_dim=vc->codebooks[book_idx].dimensions;
571
572 if (floor_setup->data.t0.book_list[idx]>vc->codebook_count)
573 return 1;
574 }
575 }
576
577 create_map( vc, i );
578
579 /* allocate mem for lsp coefficients */
580 {
581 /* codebook dim is for padding if codebook dim doesn't *
582 * divide order+1 then we need to read more data */
583 floor_setup->data.t0.lsp=
584 av_malloc((floor_setup->data.t0.order+1 + max_codebook_dim)
585 * sizeof(float));
586 if(!floor_setup->data.t0.lsp) { return 1; }
587 }
588
589#ifdef V_DEBUG /* debug output parsed headers */
590 AV_DEBUG("floor0 order: %u\n", floor_setup->data.t0.order);
591 AV_DEBUG("floor0 rate: %u\n", floor_setup->data.t0.rate);
592 AV_DEBUG("floor0 bark map size: %u\n",
593 floor_setup->data.t0.bark_map_size);
594 AV_DEBUG("floor0 amplitude bits: %u\n",
595 floor_setup->data.t0.amplitude_bits);
596 AV_DEBUG("floor0 amplitude offset: %u\n",
597 floor_setup->data.t0.amplitude_offset);
598 AV_DEBUG("floor0 number of books: %u\n",
599 floor_setup->data.t0.num_books);
600 AV_DEBUG("floor0 book list pointer: %p\n",
601 floor_setup->data.t0.book_list);
602 {
603 int idx;
604 for (idx=0;idx<floor_setup->data.t0.num_books;++idx) {
605 AV_DEBUG( " Book %d: %u\n",
606 idx+1,
607 floor_setup->data.t0.book_list[idx] );
608 }
609 }
610#endif
611 }
612 else {
613 av_log(vc->avccontext, AV_LOG_ERROR, "Invalid floor type!\n");
614 return 1;
615 }
616 }
617 return 0;
618}
619
620// Process residues part
621
622static int vorbis_parse_setup_hdr_residues(vorbis_context *vc){
623 GetBitContext *gb=&vc->gb;
624 uint_fast8_t i, j, k;
625
626 vc->residue_count=get_bits(gb, 6)+1;
627 vc->residues=(vorbis_residue *)av_mallocz(vc->residue_count * sizeof(vorbis_residue));
628
629 AV_DEBUG(" There are %d residues. \n", vc->residue_count);
630
631 for(i=0;i<vc->residue_count;++i) {
632 vorbis_residue *res_setup=&vc->residues[i];
633 uint_fast8_t cascade[64];
634 uint_fast8_t high_bits;
635 uint_fast8_t low_bits;
636
637 res_setup->type=get_bits(gb, 16);
638
639 AV_DEBUG(" %d. residue type %d \n", i, res_setup->type);
640
641 res_setup->begin=get_bits(gb, 24);
642 res_setup->end=get_bits(gb, 24);
643 res_setup->partition_size=get_bits(gb, 24)+1;
644 res_setup->classifications=get_bits(gb, 6)+1;
645 res_setup->classbook=get_bits(gb, 8);
646
647 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,
648 res_setup->classifications, res_setup->classbook);
649
650 for(j=0;j<res_setup->classifications;++j) {
651 high_bits=0;
652 low_bits=get_bits(gb, 3);
653 if (get_bits1(gb)) {
654 high_bits=get_bits(gb, 5);
655 }
656 cascade[j]=(high_bits<<3)+low_bits;
657
658 AV_DEBUG(" %d class casscade depth: %d \n", j, ilog(cascade[j]));
659 }
660
661 res_setup->maxpass=0;
662 for(j=0;j<res_setup->classifications;++j) {
663 for(k=0;k<8;++k) {
664 if (cascade[j]&(1<<k)) {
665 res_setup->books[j][k]=get_bits(gb, 8);
666
667 AV_DEBUG(" %d class casscade depth %d book: %d \n", j, k, res_setup->books[j][k]);
668
669 if (k>res_setup->maxpass) {
670 res_setup->maxpass=k;
671 }
672 } else {
673 res_setup->books[j][k]=-1;
674 }
675 }
676 }
677 }
678 return 0;
679}
680
681// Process mappings part
682
683static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc) {
684 GetBitContext *gb=&vc->gb;
685 uint_fast8_t i, j;
686
687 vc->mapping_count=get_bits(gb, 6)+1;
688 vc->mappings=(vorbis_mapping *)av_mallocz(vc->mapping_count * sizeof(vorbis_mapping));
689
690 AV_DEBUG(" There are %d mappings. \n", vc->mapping_count);
691
692 for(i=0;i<vc->mapping_count;++i) {
693 vorbis_mapping *mapping_setup=&vc->mappings[i];
694
695 if (get_bits(gb, 16)) {
696 av_log(vc->avccontext, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n");
697 return 1;
698 }
699 if (get_bits1(gb)) {
700 mapping_setup->submaps=get_bits(gb, 4)+1;
701 } else {
702 mapping_setup->submaps=1;
703 }
704
705 if (get_bits1(gb)) {
706 mapping_setup->coupling_steps=get_bits(gb, 8)+1;
707 mapping_setup->magnitude=(uint_fast8_t *)av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
708 mapping_setup->angle=(uint_fast8_t *)av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
709 for(j=0;j<mapping_setup->coupling_steps;++j) {
710 mapping_setup->magnitude[j]=get_bits(gb, ilog(vc->audio_channels-1));
711 mapping_setup->angle[j]=get_bits(gb, ilog(vc->audio_channels-1));
712 // FIXME: sanity checks
713 }
714 } else {
715 mapping_setup->coupling_steps=0;
716 }
717
718 AV_DEBUG(" %d mapping coupling steps: %d \n", i, mapping_setup->coupling_steps);
719
720 if(get_bits(gb, 2)) {
721 av_log(vc->avccontext, AV_LOG_ERROR, "%d. mapping setup data invalid. \n", i);
722 return 1; // following spec.
723 }
724
725 if (mapping_setup->submaps>1) {
726 mapping_setup->mux=(uint_fast8_t *)av_mallocz(vc->audio_channels * sizeof(uint_fast8_t));
727 for(j=0;j<vc->audio_channels;++j) {
728 mapping_setup->mux[j]=get_bits(gb, 4);
729 }
730 }
731
732 for(j=0;j<mapping_setup->submaps;++j) {
733 get_bits(gb, 8); // FIXME check?
734 mapping_setup->submap_floor[j]=get_bits(gb, 8);
735 mapping_setup->submap_residue[j]=get_bits(gb, 8);
736
737 AV_DEBUG(" %d mapping %d submap : floor %d, residue %d \n", i, j, mapping_setup->submap_floor[j], mapping_setup->submap_residue[j]);
738 }
739 }
740 return 0;
741}
742
743// Process modes part
744
745static void create_map( vorbis_context * vc, uint_fast8_t floor_number )
746{
747 vorbis_floor * floors=vc->floors;
748 vorbis_floor0 * vf;
749 int idx;
750 int_fast8_t blockflag;
751 int_fast32_t * map;
752 int_fast32_t n; //TODO: could theoretically be smaller?
753
754 for (blockflag=0;blockflag<2;++blockflag)
755 {
756 n=vc->blocksize[blockflag]/2;
757 floors[floor_number].data.t0.map[blockflag]=
758 av_malloc((n+1) * sizeof(int_fast32_t)); // n+sentinel
759
760 map=floors[floor_number].data.t0.map[blockflag];
761 vf=&floors[floor_number].data.t0;
762
763 for (idx=0; idx<n;++idx) {
764 map[idx]=floor( BARK((vf->rate*idx)/(2.0f*n)) *
765 ((vf->bark_map_size)/
766 BARK(vf->rate/2.0f )) );
767 if (vf->bark_map_size-1 < map[idx]) {
768 map[idx]=vf->bark_map_size-1;
769 }
770 }
771 map[n]=-1;
772 vf->map_size[blockflag]=n;
773 }
774
775# ifdef V_DEBUG
776 for(idx=0;idx<=n;++idx) {
777 AV_DEBUG("floor0 map: map at pos %d is %d\n",
778 idx, map[idx]);
779 }
780# endif
781}
782
783static int vorbis_parse_setup_hdr_modes(vorbis_context *vc) {
784 GetBitContext *gb=&vc->gb;
785 uint_fast8_t i;
786
787 vc->mode_count=get_bits(gb, 6)+1;
788 vc->modes=(vorbis_mode *)av_mallocz(vc->mode_count * sizeof(vorbis_mode));
789
790 AV_DEBUG(" There are %d modes.\n", vc->mode_count);
791
792 for(i=0;i<vc->mode_count;++i) {
793 vorbis_mode *mode_setup=&vc->modes[i];
794
795 mode_setup->blockflag=get_bits(gb, 1);
796 mode_setup->windowtype=get_bits(gb, 16); //FIXME check
797 mode_setup->transformtype=get_bits(gb, 16); //FIXME check
798 mode_setup->mapping=get_bits(gb, 8); //FIXME check
799
800 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);
801 }
802 return 0;
803}
804
805// Process the whole setup header using the functions above
806
807static int vorbis_parse_setup_hdr(vorbis_context *vc) {
808 GetBitContext *gb=&vc->gb;
809
810 if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') ||
811 (get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') ||
812 (get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) {
813 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n");
814 return 1;
815 }
816
817 if (vorbis_parse_setup_hdr_codebooks(vc)) {
818 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n");
819 return 2;
820 }
821 if (vorbis_parse_setup_hdr_tdtransforms(vc)) {
822 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n");
823 return 3;
824 }
825 if (vorbis_parse_setup_hdr_floors(vc)) {
826 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n");
827 return 4;
828 }
829 if (vorbis_parse_setup_hdr_residues(vc)) {
830 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n");
831 return 5;
832 }
833 if (vorbis_parse_setup_hdr_mappings(vc)) {
834 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n");
835 return 6;
836 }
837 if (vorbis_parse_setup_hdr_modes(vc)) {
838 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n");
839 return 7;
840 }
841 if (!get_bits1(gb)) {
842 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n");
843 return 8; // framing flag bit unset error
844 }
845
846 return 0;
847}
848
849// Process the identification header
850
851static int vorbis_parse_id_hdr(vorbis_context *vc){
852 GetBitContext *gb=&vc->gb;
853 uint_fast8_t bl0, bl1;
854
855 if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') ||
856 (get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') ||
857 (get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) {
858 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n");
859 return 1;
860 }
861
862 vc->version=get_bits_long(gb, 32); //FIXME check 0
863 vc->audio_channels=get_bits(gb, 8); //FIXME check >0
864 vc->audio_samplerate=get_bits_long(gb, 32); //FIXME check >0
865 vc->bitrate_maximum=get_bits_long(gb, 32);
866 vc->bitrate_nominal=get_bits_long(gb, 32);
867 vc->bitrate_minimum=get_bits_long(gb, 32);
868 bl0=get_bits(gb, 4);
869 bl1=get_bits(gb, 4);
870 vc->blocksize[0]=(1<<bl0);
871 vc->blocksize[1]=(1<<bl1);
872 if (bl0>13 || bl0<6 || bl1>13 || bl1<6 || bl1<bl0) {
873 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n");
874 return 3;
875 }
876 // output format int16
877 if (vc->blocksize[1]/2 * vc->audio_channels * 2 >
878 AVCODEC_MAX_AUDIO_FRAME_SIZE) {
879 av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis channel count makes "
880 "output packets too large.\n");
881 return 4;
882 }
883 vc->win[0]=ff_vorbis_vwin[bl0-6];
884 vc->win[1]=ff_vorbis_vwin[bl1-6];
885
886 if(vc->exp_bias){
887 int i, j;
888 for(j=0; j<2; j++){
889 float *win = av_malloc(vc->blocksize[j]/2 * sizeof(float));
890 for(i=0; i<vc->blocksize[j]/2; i++)
891 win[i] = vc->win[j][i] * (1<<15);
892 vc->win[j] = win;
893 }
894 }
895
896 if ((get_bits1(gb)) == 0) {
897 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n");
898 return 2;
899 }
900
901 vc->channel_residues=(float *)av_malloc((vc->blocksize[1]/2)*vc->audio_channels * sizeof(float));
902 vc->channel_floors=(float *)av_malloc((vc->blocksize[1]/2)*vc->audio_channels * sizeof(float));
903 vc->saved=(float *)av_malloc((vc->blocksize[1]/2)*vc->audio_channels * sizeof(float));
904 vc->ret=(float *)av_malloc((vc->blocksize[1]/2)*vc->audio_channels * sizeof(float));
905 vc->buf=(float *)av_malloc(vc->blocksize[1] * sizeof(float));
906 vc->buf_tmp=(float *)av_malloc(vc->blocksize[1] * sizeof(float));
907 vc->saved_start=0;
908
909 ff_mdct_init(&vc->mdct[0], bl0, 1);
910 ff_mdct_init(&vc->mdct[1], bl1, 1);
911
912 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 ",
913 vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize[0], vc->blocksize[1]);
914
915/*
916 BLK=vc->blocksize[0];
917 for(i=0;i<BLK/2;++i) {
918 vc->win[0][i]=sin(0.5*3.14159265358*(sin(((float)i+0.5)/(float)BLK*3.14159265358))*(sin(((float)i+0.5)/(float)BLK*3.14159265358)));
919 }
920*/
921
922 return 0;
923}
924
925// Process the extradata using the functions above (identification header, setup header)
926
927static int vorbis_decode_init(AVCodecContext *avccontext) {
928 vorbis_context *vc = avccontext->priv_data ;
929 uint8_t *headers = avccontext->extradata;
930 int headers_len=avccontext->extradata_size;
931 uint8_t *header_start[3];
932 int header_len[3];
933 GetBitContext *gb = &(vc->gb);
934 int hdr_type;
935
936 vc->avccontext = avccontext;
937 dsputil_init(&vc->dsp, avccontext);
938
939 if(vc->dsp.float_to_int16 == ff_float_to_int16_c) {
940 vc->add_bias = 385;
941 vc->exp_bias = 0;
942 } else {
943 vc->add_bias = 0;
944 vc->exp_bias = 15<<23;
945 }
946
947 if (!headers_len) {
948 av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
949 return -1;
950 }
951
952 if (ff_split_xiph_headers(headers, headers_len, 30, header_start, header_len) < 0) {
953 av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
954 return -1;
955 }
956
957 init_get_bits(gb, header_start[0], header_len[0]*8);
958 hdr_type=get_bits(gb, 8);
959 if (hdr_type!=1) {
960 av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n");
961 return -1;
962 }
963 if (vorbis_parse_id_hdr(vc)) {
964 av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n");
965 vorbis_free(vc);
966 return -1;
967 }
968
969 init_get_bits(gb, header_start[2], header_len[2]*8);
970 hdr_type=get_bits(gb, 8);
971 if (hdr_type!=5) {
972 av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");
973 return -1;
974 }
975 if (vorbis_parse_setup_hdr(vc)) {
976 av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");
977 vorbis_free(vc);
978 return -1;
979 }
980
981 avccontext->channels = vc->audio_channels;
982 avccontext->sample_rate = vc->audio_samplerate;
983
984 return 0 ;
985}
986
987// Decode audiopackets -------------------------------------------------
988
989// Read and decode floor
990
991static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,
992 vorbis_floor_data *vfu, float *vec) {
993 vorbis_floor0 * vf=&vfu->t0;
994 float * lsp=vf->lsp;
995 uint_fast32_t amplitude;
996 uint_fast32_t book_idx;
997 uint_fast8_t blockflag=vc->modes[vc->mode_number].blockflag;
998
999 amplitude=get_bits(&vc->gb, vf->amplitude_bits);
1000 if (amplitude>0) {
1001 float last = 0;
1002 uint_fast16_t lsp_len = 0;
1003 uint_fast16_t idx;
1004 vorbis_codebook codebook;
1005
1006 book_idx=get_bits(&vc->gb, ilog(vf->num_books));
1007 if ( book_idx >= vf->num_books ) {
1008 av_log( vc->avccontext, AV_LOG_ERROR,
1009 "floor0 dec: booknumber too high!\n" );
1010 //FIXME: look above
1011 }
1012 AV_DEBUG( "floor0 dec: booknumber: %u\n", book_idx );
1013 codebook=vc->codebooks[vf->book_list[book_idx]];
1014
1015 while (lsp_len<vf->order) {
1016 int vec_off;
1017
1018 AV_DEBUG( "floor0 dec: book dimension: %d\n", codebook.dimensions );
1019 AV_DEBUG( "floor0 dec: maximum depth: %d\n", codebook.maxdepth );
1020 /* read temp vector */
1021 vec_off=get_vlc2(&vc->gb,
1022 codebook.vlc.table,
1023 codebook.nb_bits,
1024 codebook.maxdepth ) *
1025 codebook.dimensions;
1026 AV_DEBUG( "floor0 dec: vector offset: %d\n", vec_off );
1027 /* copy each vector component and add last to it */
1028 for (idx=0; idx<codebook.dimensions; ++idx) {
1029 lsp[lsp_len+idx]=codebook.codevectors[vec_off+idx]+last;
1030 }
1031 last=lsp[lsp_len+idx-1]; /* set last to last vector component */
1032
1033 lsp_len += codebook.dimensions;
1034 }
1035#ifdef V_DEBUG
1036 /* DEBUG: output lsp coeffs */
1037 {
1038 int idx;
1039 for ( idx = 0; idx < lsp_len; ++idx )
1040 AV_DEBUG("floor0 dec: coeff at %d is %f\n", idx, lsp[idx] );
1041 }
1042#endif
1043
1044 /* synthesize floor output vector */
1045 {
1046 int i;
1047 int order=vf->order;
1048 float wstep=M_PI/vf->bark_map_size;
1049
1050 for(i=0;i<order;i++) { lsp[i]=2.0f*cos(lsp[i]); }
1051
1052 AV_DEBUG("floor0 synth: map_size=%d; m=%d; wstep=%f\n",
1053 vf->map_size, order, wstep);
1054
1055 i=0;
1056 while(i<vf->map_size[blockflag]) {
1057 int j, iter_cond=vf->map[blockflag][i];
1058 float p=0.5f;
1059 float q=0.5f;
1060 float two_cos_w=2.0f*cos(wstep*iter_cond); // needed all times
1061
1062 /* similar part for the q and p products */
1063 for(j=0;j<order;j+=2) {
1064 q *= lsp[j] -two_cos_w;
1065 p *= lsp[j+1]-two_cos_w;
1066 }
1067 if(j==order) { // even order
1068 p *= p*(2.0f-two_cos_w);
1069 q *= q*(2.0f+two_cos_w);
1070 }
1071 else { // odd order
1072 q *= two_cos_w-lsp[j]; // one more time for q
1073
1074 /* final step and square */
1075 p *= p*(4.f-two_cos_w*two_cos_w);
1076 q *= q;
1077 }
1078
1079 /* calculate linear floor value */
1080 {
1081 q=exp( (
1082 ( (amplitude*vf->amplitude_offset)/
1083 (((1<<vf->amplitude_bits)-1) * sqrt(p+q)) )
1084 - vf->amplitude_offset ) * .11512925f
1085 );
1086 }
1087
1088 /* fill vector */
1089 do { vec[i]=q; ++i; }while(vf->map[blockflag][i]==iter_cond);
1090 }
1091 }
1092 }
1093 else {
1094 /* this channel is unused */
1095 return 1;
1096 }
1097
1098 AV_DEBUG(" Floor0 decoded\n");
1099
1100 return 0;
1101}
1102
1103static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc, vorbis_floor_data *vfu, float *vec) {
1104 vorbis_floor1 * vf=&vfu->t1;
1105 GetBitContext *gb=&vc->gb;
1106 uint_fast16_t range_v[4]={ 256, 128, 86, 64 };
1107 uint_fast16_t range=range_v[vf->multiplier-1];
1108 uint_fast16_t floor1_Y[vf->x_list_dim];
1109 uint_fast16_t floor1_Y_final[vf->x_list_dim];
1110 int floor1_flag[vf->x_list_dim];
1111 uint_fast8_t class_;
1112 uint_fast8_t cdim;
1113 uint_fast8_t cbits;
1114 uint_fast8_t csub;
1115 uint_fast8_t cval;
1116 int_fast16_t book;
1117 uint_fast16_t offset;
1118 uint_fast16_t i,j;
1119 /*u*/int_fast16_t adx, ady, off, predicted; // WTF ? dy/adx= (unsigned)dy/adx ?
1120 int_fast16_t dy, err;
1121
1122
1123 if (!get_bits1(gb)) return 1; // silence
1124
1125// Read values (or differences) for the floor's points
1126
1127 floor1_Y[0]=get_bits(gb, ilog(range-1));
1128 floor1_Y[1]=get_bits(gb, ilog(range-1));
1129
1130 AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);
1131
1132 offset=2;
1133 for(i=0;i<vf->partitions;++i) {
1134 class_=vf->partition_class[i];
1135 cdim=vf->class_dimensions[class_];
1136 cbits=vf->class_subclasses[class_];
1137 csub=(1<<cbits)-1;
1138 cval=0;
1139
1140 AV_DEBUG("Cbits %d \n", cbits);
1141
1142 if (cbits) { // this reads all subclasses for this partition's class
1143 cval=get_vlc2(gb, vc->codebooks[vf->class_masterbook[class_]].vlc.table,
1144 vc->codebooks[vf->class_masterbook[class_]].nb_bits, 3);
1145 }
1146
1147 for(j=0;j<cdim;++j) {
1148 book=vf->subclass_books[class_][cval & csub];
1149
1150 AV_DEBUG("book %d Cbits %d cval %d bits:%d \n", book, cbits, cval, get_bits_count(gb));
1151
1152 cval=cval>>cbits;
1153 if (book>-1) {
1154 floor1_Y[offset+j]=get_vlc2(gb, vc->codebooks[book].vlc.table,
1155 vc->codebooks[book].nb_bits, 3);
1156 } else {
1157 floor1_Y[offset+j]=0;
1158 }
1159
1160 AV_DEBUG(" floor(%d) = %d \n", vf->list[offset+j].x, floor1_Y[offset+j]);
1161 }
1162 offset+=cdim;
1163 }
1164
1165// Amplitude calculation from the differences
1166
1167 floor1_flag[0]=1;
1168 floor1_flag[1]=1;
1169 floor1_Y_final[0]=floor1_Y[0];
1170 floor1_Y_final[1]=floor1_Y[1];
1171
1172 for(i=2;i<vf->x_list_dim;++i) {
1173 uint_fast16_t val, highroom, lowroom, room;
1174 uint_fast16_t high_neigh_offs;
1175 uint_fast16_t low_neigh_offs;
1176
1177 low_neigh_offs=vf->list[i].low;
1178 high_neigh_offs=vf->list[i].high;
1179 dy=floor1_Y_final[high_neigh_offs]-floor1_Y_final[low_neigh_offs]; // render_point begin
1180 adx=vf->list[high_neigh_offs].x-vf->list[low_neigh_offs].x;
1181 ady= FFABS(dy);
1182 err=ady*(vf->list[i].x-vf->list[low_neigh_offs].x);
1183 off=(int16_t)err/(int16_t)adx;
1184 if (dy<0) {
1185 predicted=floor1_Y_final[low_neigh_offs]-off;
1186 } else {
1187 predicted=floor1_Y_final[low_neigh_offs]+off;
1188 } // render_point end
1189
1190 val=floor1_Y[i];
1191 highroom=range-predicted;
1192 lowroom=predicted;
1193 if (highroom < lowroom) {
1194 room=highroom*2;
1195 } else {
1196 room=lowroom*2; // SPEC mispelling
1197 }
1198 if (val) {
1199 floor1_flag[low_neigh_offs]=1;
1200 floor1_flag[high_neigh_offs]=1;
1201 floor1_flag[i]=1;
1202 if (val>=room) {
1203 if (highroom > lowroom) {
1204 floor1_Y_final[i]=val-lowroom+predicted;
1205 } else {
1206 floor1_Y_final[i]=predicted-val+highroom-1;
1207 }
1208 } else {
1209 if (val & 1) {
1210 floor1_Y_final[i]=predicted-(val+1)/2;
1211 } else {
1212 floor1_Y_final[i]=predicted+val/2;
1213 }
1214 }
1215 } else {
1216 floor1_flag[i]=0;
1217 floor1_Y_final[i]=predicted;
1218 }
1219
1220 AV_DEBUG(" Decoded floor(%d) = %d / val %d \n", vf->list[i].x, floor1_Y_final[i], val);
1221 }
1222
1223// Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?
1224
1225 ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);
1226
1227 AV_DEBUG(" Floor decoded\n");
1228
1229 return 0;
1230}
1231
1232// Read and decode residue
1233
1234static 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) {
1235 GetBitContext *gb=&vc->gb;
1236 uint_fast8_t c_p_c=vc->codebooks[vr->classbook].dimensions;
1237 uint_fast16_t n_to_read=vr->end-vr->begin;
1238 uint_fast16_t ptns_to_read=n_to_read/vr->partition_size;
1239 uint_fast8_t classifs[ptns_to_read*vc->audio_channels];
1240 uint_fast8_t pass;
1241 uint_fast8_t ch_used;
1242 uint_fast8_t i,j,l;
1243 uint_fast16_t k;
1244
1245 if (vr->type==2) {
1246 for(j=1;j<ch;++j) {
1247 do_not_decode[0]&=do_not_decode[j]; // FIXME - clobbering input
1248 }
1249 if (do_not_decode[0]) return 0;
1250 ch_used=1;
1251 } else {
1252 ch_used=ch;
1253 }
1254
1255 AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d cpc %d \n", ch, c_p_c);
1256
1257 for(pass=0;pass<=vr->maxpass;++pass) { // FIXME OPTIMIZE?
1258 uint_fast16_t voffset;
1259 uint_fast16_t partition_count;
1260 uint_fast16_t j_times_ptns_to_read;
1261
1262 voffset=vr->begin;
1263 for(partition_count=0;partition_count<ptns_to_read;) { // SPEC error
1264 if (!pass) {
1265 uint_fast32_t inverse_class = ff_inverse[vr->classifications];
1266 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {
1267 if (!do_not_decode[j]) {
1268 uint_fast32_t temp=get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,
1269 vc->codebooks[vr->classbook].nb_bits, 3);
1270
1271 AV_DEBUG("Classword: %d \n", temp);
1272
1273 assert(vr->classifications > 1 && temp<=65536); //needed for inverse[]
1274 for(i=0;i<c_p_c;++i) {
1275 uint_fast32_t temp2;
1276
1277 temp2=(((uint_fast64_t)temp) * inverse_class)>>32;
1278 if (partition_count+c_p_c-1-i < ptns_to_read) {
1279 classifs[j_times_ptns_to_read+partition_count+c_p_c-1-i]=temp-temp2*vr->classifications;
1280 }
1281 temp=temp2;
1282 }
1283 }
1284 j_times_ptns_to_read+=ptns_to_read;
1285 }
1286 }
1287 for(i=0;(i<c_p_c) && (partition_count<ptns_to_read);++i) {
1288 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {
1289 uint_fast16_t voffs;
1290
1291 if (!do_not_decode[j]) {
1292 uint_fast8_t vqclass=classifs[j_times_ptns_to_read+partition_count];
1293 int_fast16_t vqbook=vr->books[vqclass][pass];
1294
1295 if (vqbook>=0) {
1296 uint_fast16_t coffs;
1297 unsigned dim= vc->codebooks[vqbook].dimensions; // not uint_fast8_t: 64bit is slower here on amd64
1298 uint_fast16_t step= dim==1 ? vr->partition_size
1299 : FASTDIV(vr->partition_size, dim);
1300 vorbis_codebook codebook= vc->codebooks[vqbook];
1301
1302 if (vr->type==0) {
1303
1304 voffs=voffset+j*vlen;
1305 for(k=0;k<step;++k) {
1306 coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1307 for(l=0;l<dim;++l) {
1308 vec[voffs+k+l*step]+=codebook.codevectors[coffs+l]; // FPMATH
1309 }
1310 }
1311 }
1312 else if (vr->type==1) {
1313 voffs=voffset+j*vlen;
1314 for(k=0;k<step;++k) {
1315 coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1316 for(l=0;l<dim;++l, ++voffs) {
1317 vec[voffs]+=codebook.codevectors[coffs+l]; // FPMATH
1318
1319 AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d \n", pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);
1320 }
1321 }
1322 }
1323 else if (vr->type==2 && ch==2 && (voffset&1)==0 && (dim&1)==0) { // most frequent case optimized
1324 voffs=voffset>>1;
1325
1326 if(dim==2) {
1327 for(k=0;k<step;++k) {
1328 coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;
1329 vec[voffs+k ]+=codebook.codevectors[coffs ]; // FPMATH
1330 vec[voffs+k+vlen]+=codebook.codevectors[coffs+1]; // FPMATH
1331 }
1332 } else
1333 for(k=0;k<step;++k) {
1334 coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1335 for(l=0;l<dim;l+=2, voffs++) {
1336 vec[voffs ]+=codebook.codevectors[coffs+l ]; // FPMATH
1337 vec[voffs+vlen]+=codebook.codevectors[coffs+l+1]; // FPMATH
1338
1339 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);
1340 }
1341 }
1342
1343 }
1344 else if (vr->type==2) {
1345 voffs=voffset;
1346
1347 for(k=0;k<step;++k) {
1348 coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1349 for(l=0;l<dim;++l, ++voffs) {
1350 vec[voffs/ch+(voffs%ch)*vlen]+=codebook.codevectors[coffs+l]; // FPMATH FIXME use if and counter instead of / and %
1351
1352 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);
1353 }
1354 }
1355 } else {
1356 av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");
1357 return 1;
1358 }
1359 }
1360 }
1361 j_times_ptns_to_read+=ptns_to_read;
1362 }
1363 ++partition_count;
1364 voffset+=vr->partition_size;
1365 }
1366 }
1367 }
1368 return 0;
1369}
1370
1371void vorbis_inverse_coupling(float *mag, float *ang, int blocksize)
1372{
1373 int i;
1374 for(i=0; i<blocksize; i++)
1375 {
1376 if (mag[i]>0.0) {
1377 if (ang[i]>0.0) {
1378 ang[i]=mag[i]-ang[i];
1379 } else {
1380 float temp=ang[i];
1381 ang[i]=mag[i];
1382 mag[i]+=temp;
1383 }
1384 } else {
1385 if (ang[i]>0.0) {
1386 ang[i]+=mag[i];
1387 } else {
1388 float temp=ang[i];
1389 ang[i]=mag[i];
1390 mag[i]-=temp;
1391 }
1392 }
1393 }
1394}
1395
1396// Decode the audio packet using the functions above
1397
1398static int vorbis_parse_audio_packet(vorbis_context *vc) {
1399 GetBitContext *gb=&vc->gb;
1400
1401 uint_fast8_t previous_window=0,next_window=0;
1402 uint_fast8_t mode_number;
1403 uint_fast16_t blocksize;
1404 int_fast32_t i,j;
1405 uint_fast8_t no_residue[vc->audio_channels];
1406 uint_fast8_t do_not_decode[vc->audio_channels];
1407 vorbis_mapping *mapping;
1408 float *ch_res_ptr=vc->channel_residues;
1409 float *ch_floor_ptr=vc->channel_floors;
1410 uint_fast8_t res_chan[vc->audio_channels];
1411 uint_fast8_t res_num=0;
1412 int_fast16_t retlen=0;
1413 uint_fast16_t saved_start=0;
1414 float fadd_bias = vc->add_bias;
1415
1416 if (get_bits1(gb)) {
1417 av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");
1418 return -1; // packet type not audio
1419 }
1420
1421 if (vc->mode_count==1) {
1422 mode_number=0;
1423 } else {
1424 mode_number=get_bits(gb, ilog(vc->mode_count-1));
1425 }
1426 vc->mode_number=mode_number;
1427 mapping=&vc->mappings[vc->modes[mode_number].mapping];
1428
1429 AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);
1430
1431 if (vc->modes[mode_number].blockflag) {
1432 previous_window=get_bits1(gb);
1433 next_window=get_bits1(gb);
1434 }
1435
1436 blocksize=vc->blocksize[vc->modes[mode_number].blockflag];
1437 memset(ch_res_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?
1438 memset(ch_floor_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?
1439
1440// Decode floor
1441
1442 for(i=0;i<vc->audio_channels;++i) {
1443 vorbis_floor *floor;
1444 if (mapping->submaps>1) {
1445 floor=&vc->floors[mapping->submap_floor[mapping->mux[i]]];
1446 } else {
1447 floor=&vc->floors[mapping->submap_floor[0]];
1448 }
1449
1450 no_residue[i]=floor->decode(vc, &floor->data, ch_floor_ptr);
1451 ch_floor_ptr+=blocksize/2;
1452 }
1453
1454// Nonzero vector propagate
1455
1456 for(i=mapping->coupling_steps-1;i>=0;--i) {
1457 if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {
1458 no_residue[mapping->magnitude[i]]=0;
1459 no_residue[mapping->angle[i]]=0;
1460 }
1461 }
1462
1463// Decode residue
1464
1465 for(i=0;i<mapping->submaps;++i) {
1466 vorbis_residue *residue;
1467 uint_fast8_t ch=0;
1468
1469 for(j=0;j<vc->audio_channels;++j) {
1470 if ((mapping->submaps==1) || (i=mapping->mux[j])) {
1471 res_chan[j]=res_num;
1472 if (no_residue[j]) {
1473 do_not_decode[ch]=1;
1474 } else {
1475 do_not_decode[ch]=0;
1476 }
1477 ++ch;
1478 ++res_num;
1479 }
1480 }
1481 residue=&vc->residues[mapping->submap_residue[i]];
1482 vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);
1483
1484 ch_res_ptr+=ch*blocksize/2;
1485 }
1486
1487// Inverse coupling
1488
1489 for(i=mapping->coupling_steps-1;i>=0;--i) { //warning: i has to be signed
1490 float *mag, *ang;
1491
1492 mag=vc->channel_residues+res_chan[mapping->magnitude[i]]*blocksize/2;
1493 ang=vc->channel_residues+res_chan[mapping->angle[i]]*blocksize/2;
1494 vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize/2);
1495 }
1496
1497// Dotproduct
1498
1499 for(j=0, ch_floor_ptr=vc->channel_floors;j<vc->audio_channels;++j,ch_floor_ptr+=blocksize/2) {
1500 ch_res_ptr=vc->channel_residues+res_chan[j]*blocksize/2;
1501 vc->dsp.vector_fmul(ch_floor_ptr, ch_res_ptr, blocksize/2);
1502 }
1503
1504// MDCT, overlap/add, save data for next overlapping FPMATH
1505
1506 for(j=0;j<vc->audio_channels;++j) {
1507 uint_fast8_t step=vc->audio_channels;
1508 uint_fast16_t k;
1509 float *saved=vc->saved+j*vc->blocksize[1]/2;
1510 float *ret=vc->ret;
1511 const float *lwin=vc->win[1];
1512 const float *swin=vc->win[0];
1513 float *buf=vc->buf;
1514 float *buf_tmp=vc->buf_tmp;
1515
1516 ch_floor_ptr=vc->channel_floors+j*blocksize/2;
1517
1518 saved_start=vc->saved_start;
1519
1520 vc->mdct[0].fft.imdct_calc(&vc->mdct[vc->modes[mode_number].blockflag], buf, ch_floor_ptr, buf_tmp);
1521
1522 //FIXME process channels together, to allow faster simd vector_fmul_add_add?
1523 if (vc->modes[mode_number].blockflag) {
1524 // -- overlap/add
1525 if (previous_window) {
1526 vc->dsp.vector_fmul_add_add(ret+j, buf, lwin, saved, vc->add_bias, vc->blocksize[1]/2, step);
1527 retlen=vc->blocksize[1]/2;
1528 } else {
1529 int len = (vc->blocksize[1]-vc->blocksize[0])/4;
1530 buf += len;
1531 vc->dsp.vector_fmul_add_add(ret+j, buf, swin, saved, vc->add_bias, vc->blocksize[0]/2, step);
1532 k = vc->blocksize[0]/2*step + j;
1533 buf += vc->blocksize[0]/2;
1534 if(vc->exp_bias){
1535 for(i=0; i<len; i++, k+=step)
1536 ((uint32_t*)ret)[k] = ((uint32_t*)buf)[i] + vc->exp_bias; // ret[k]=buf[i]*(1<<bias)
1537 } else {
1538 for(i=0; i<len; i++, k+=step)
1539 ret[k] = buf[i] + fadd_bias;
1540 }
1541 buf=vc->buf;
1542 retlen=vc->blocksize[0]/2+len;
1543 }
1544 // -- save
1545 if (next_window) {
1546 buf += vc->blocksize[1]/2;
1547 vc->dsp.vector_fmul_reverse(saved, buf, lwin, vc->blocksize[1]/2);
1548 saved_start=0;
1549 } else {
1550 saved_start=(vc->blocksize[1]-vc->blocksize[0])/4;
1551 buf += vc->blocksize[1]/2;
1552 for(i=0; i<saved_start; i++)
1553 ((uint32_t*)saved)[i] = ((uint32_t*)buf)[i] + vc->exp_bias;
1554 vc->dsp.vector_fmul_reverse(saved+saved_start, buf+saved_start, swin, vc->blocksize[0]/2);
1555 }
1556 } else {
1557 // --overlap/add
1558 if(vc->add_bias) {
1559 for(k=j, i=0;i<saved_start;++i, k+=step)
1560 ret[k] = saved[i] + fadd_bias;
1561 } else {
1562 for(k=j, i=0;i<saved_start;++i, k+=step)
1563 ret[k] = saved[i];
1564 }
1565 vc->dsp.vector_fmul_add_add(ret+k, buf, swin, saved+saved_start, vc->add_bias, vc->blocksize[0]/2, step);
1566 retlen=saved_start+vc->blocksize[0]/2;
1567 // -- save
1568 buf += vc->blocksize[0]/2;
1569 vc->dsp.vector_fmul_reverse(saved, buf, swin, vc->blocksize[0]/2);
1570 saved_start=0;
1571 }
1572 }
1573 vc->saved_start=saved_start;
1574
1575 return retlen*vc->audio_channels;
1576}
1577
1578// Return the decoded audio packet through the standard api
1579
1580static int vorbis_decode_frame(AVCodecContext *avccontext,
1581 void *data, int *data_size,
1582 uint8_t *buf, int buf_size)
1583{
1584 vorbis_context *vc = avccontext->priv_data ;
1585 GetBitContext *gb = &(vc->gb);
1586
1587 int_fast16_t len;
1588
1589 if(!buf_size){
1590 return 0;
1591 }
1592
1593 AV_DEBUG("packet length %d \n", buf_size);
1594
1595 init_get_bits(gb, buf, buf_size*8);
1596
1597 len=vorbis_parse_audio_packet(vc);
1598
1599 if (len<=0) {
1600 *data_size=0;
1601 return buf_size;
1602 }
1603
1604 if (!vc->first_frame) {
1605 vc->first_frame=1;
1606 *data_size=0;
1607 return buf_size ;
1608 }
1609
1610 AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);
1611
1612 vc->dsp.float_to_int16(data, vc->ret, len);
1613 *data_size=len*2;
1614
1615 return buf_size ;
1616}
1617
1618// Close decoder
1619
1620static int vorbis_decode_close(AVCodecContext *avccontext) {
1621 vorbis_context *vc = avccontext->priv_data;
1622
1623 vorbis_free(vc);
1624
1625 return 0 ;
1626}
1627
1628AVCodec vorbis_decoder = {
1629 "vorbis",
1630 CODEC_TYPE_AUDIO,
1631 CODEC_ID_VORBIS,
1632 sizeof(vorbis_context),
1633 vorbis_decode_init,
1634 NULL,
1635 vorbis_decode_close,
1636 vorbis_decode_frame,
1637};
1638