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flacdec: change frame bps validation to return an error value if bps
[FFMpeg-mirror/lagarith.git] / libavcodec / vorbis_dec.c
blob6ca8763bb3ff43700dc7ec43bef2ebffe78163c9
1 /**
2 * @file libavcodec/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 #undef V_DEBUG
24 //#define V_DEBUG
25 //#define AV_DEBUG(...) av_log(NULL, AV_LOG_INFO, __VA_ARGS__)
26
27 #include <math.h>
28
29 #define ALT_BITSTREAM_READER_LE
30 #include "avcodec.h"
31 #include "bitstream.h"
32 #include "dsputil.h"
33
34 #include "vorbis.h"
35 #include "xiph.h"
36
37 #define V_NB_BITS 8
38 #define V_NB_BITS2 11
39 #define V_MAX_VLCS (1<<16)
40
41 #ifndef V_DEBUG
42 #define AV_DEBUG(...)
43 #endif
44
45 #undef NDEBUG
46 #include <assert.h>
47
48 typedef struct {
49 uint_fast8_t dimensions;
50 uint_fast8_t lookup_type;
51 uint_fast8_t maxdepth;
52 VLC vlc;
53 float *codevectors;
54 unsigned int nb_bits;
55 } vorbis_codebook;
56
57 typedef union vorbis_floor_u vorbis_floor_data;
58 typedef struct vorbis_floor0_s vorbis_floor0;
59 typedef struct vorbis_floor1_s vorbis_floor1;
60 struct vorbis_context_s;
61 typedef
62 uint_fast8_t (* vorbis_floor_decode_func)
63 (struct vorbis_context_s *, vorbis_floor_data *, float *);
64 typedef struct {
65 uint_fast8_t floor_type;
66 vorbis_floor_decode_func decode;
67 union vorbis_floor_u
68 {
69 struct vorbis_floor0_s
70 {
71 uint_fast8_t order;
72 uint_fast16_t rate;
73 uint_fast16_t bark_map_size;
74 int_fast32_t * map[2];
75 uint_fast32_t map_size[2];
76 uint_fast8_t amplitude_bits;
77 uint_fast8_t amplitude_offset;
78 uint_fast8_t num_books;
79 uint_fast8_t * book_list;
80 float * lsp;
81 } t0;
82 struct vorbis_floor1_s
83 {
84 uint_fast8_t partitions;
85 uint_fast8_t maximum_class;
86 uint_fast8_t partition_class[32];
87 uint_fast8_t class_dimensions[16];
88 uint_fast8_t class_subclasses[16];
89 uint_fast8_t class_masterbook[16];
90 int_fast16_t subclass_books[16][8];
91 uint_fast8_t multiplier;
92 uint_fast16_t x_list_dim;
93 vorbis_floor1_entry * list;
94 } t1;
95 } data;
96 } vorbis_floor;
97
98 typedef struct {
99 uint_fast16_t type;
100 uint_fast32_t begin;
101 uint_fast32_t end;
102 uint_fast32_t partition_size;
103 uint_fast8_t classifications;
104 uint_fast8_t classbook;
105 int_fast16_t books[64][8];
106 uint_fast8_t maxpass;
107 } vorbis_residue;
108
109 typedef struct {
110 uint_fast8_t submaps;
111 uint_fast16_t coupling_steps;
112 uint_fast8_t *magnitude;
113 uint_fast8_t *angle;
114 uint_fast8_t *mux;
115 uint_fast8_t submap_floor[16];
116 uint_fast8_t submap_residue[16];
117 } vorbis_mapping;
118
119 typedef struct {
120 uint_fast8_t blockflag;
121 uint_fast16_t windowtype;
122 uint_fast16_t transformtype;
123 uint_fast8_t mapping;
124 } vorbis_mode;
125
126 typedef struct vorbis_context_s {
127 AVCodecContext *avccontext;
128 GetBitContext gb;
129 DSPContext dsp;
130
131 MDCTContext mdct[2];
132 uint_fast8_t first_frame;
133 uint_fast32_t version;
134 uint_fast8_t audio_channels;
135 uint_fast32_t audio_samplerate;
136 uint_fast32_t bitrate_maximum;
137 uint_fast32_t bitrate_nominal;
138 uint_fast32_t bitrate_minimum;
139 uint_fast32_t blocksize[2];
140 const float * win[2];
141 uint_fast16_t codebook_count;
142 vorbis_codebook *codebooks;
143 uint_fast8_t floor_count;
144 vorbis_floor *floors;
145 uint_fast8_t residue_count;
146 vorbis_residue *residues;
147 uint_fast8_t mapping_count;
148 vorbis_mapping *mappings;
149 uint_fast8_t mode_count;
150 vorbis_mode *modes;
151 uint_fast8_t mode_number; // mode number for the current packet
152 uint_fast8_t previous_window;
153 float *channel_residues;
154 float *channel_floors;
155 float *saved;
156 uint_fast32_t add_bias; // for float->int conversion
157 uint_fast32_t exp_bias;
158 } vorbis_context;
159
160 /* Helper functions */
161
162 #define BARK(x) \
163 (13.1f*atan(0.00074f*(x))+2.24f*atan(1.85e-8f*(x)*(x))+1e-4f*(x))
164
165 static float vorbisfloat2float(uint_fast32_t val) {
166 double mant=val&0x1fffff;
167 long exp=(val&0x7fe00000L)>>21;
168 if (val&0x80000000) mant=-mant;
169 return ldexp(mant, exp - 20 - 768);
170 }
171
172
173 // Free all allocated memory -----------------------------------------
174
175 static void vorbis_free(vorbis_context *vc) {
176 int_fast16_t i;
177
178 av_freep(&vc->channel_residues);
179 av_freep(&vc->channel_floors);
180 av_freep(&vc->saved);
181
182 av_freep(&vc->residues);
183 av_freep(&vc->modes);
184
185 ff_mdct_end(&vc->mdct[0]);
186 ff_mdct_end(&vc->mdct[1]);
187
188 for(i=0;i<vc->codebook_count;++i) {
189 av_free(vc->codebooks[i].codevectors);
190 free_vlc(&vc->codebooks[i].vlc);
191 }
192 av_freep(&vc->codebooks);
193
194 for(i=0;i<vc->floor_count;++i) {
195 if(vc->floors[i].floor_type==0) {
196 av_free(vc->floors[i].data.t0.map[0]);
197 av_free(vc->floors[i].data.t0.map[1]);
198 av_free(vc->floors[i].data.t0.book_list);
199 av_free(vc->floors[i].data.t0.lsp);
200 }
201 else {
202 av_free(vc->floors[i].data.t1.list);
203 }
204 }
205 av_freep(&vc->floors);
206
207 for(i=0;i<vc->mapping_count;++i) {
208 av_free(vc->mappings[i].magnitude);
209 av_free(vc->mappings[i].angle);
210 av_free(vc->mappings[i].mux);
211 }
212 av_freep(&vc->mappings);
213
214 if(vc->exp_bias){
215 av_freep(&vc->win[0]);
216 av_freep(&vc->win[1]);
217 }
218 }
219
220 // Parse setup header -------------------------------------------------
221
222 // Process codebooks part
223
224 static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc) {
225 uint_fast16_t cb;
226 uint8_t *tmp_vlc_bits;
227 uint32_t *tmp_vlc_codes;
228 GetBitContext *gb=&vc->gb;
229
230 vc->codebook_count=get_bits(gb,8)+1;
231
232 AV_DEBUG(" Codebooks: %d \n", vc->codebook_count);
233
234 vc->codebooks=av_mallocz(vc->codebook_count * sizeof(vorbis_codebook));
235 tmp_vlc_bits =av_mallocz(V_MAX_VLCS * sizeof(uint8_t));
236 tmp_vlc_codes=av_mallocz(V_MAX_VLCS * sizeof(uint32_t));
237
238 for(cb=0;cb<vc->codebook_count;++cb) {
239 vorbis_codebook *codebook_setup=&vc->codebooks[cb];
240 uint_fast8_t ordered;
241 uint_fast32_t t, used_entries=0;
242 uint_fast32_t entries;
243
244 AV_DEBUG(" %d. Codebook \n", cb);
245
246 if (get_bits(gb, 24)!=0x564342) {
247 av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook setup data corrupt. \n", cb);
248 goto error;
249 }
250
251 codebook_setup->dimensions=get_bits(gb, 16);
252 if (codebook_setup->dimensions>16) {
253 av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook's dimension is too large (%d). \n", cb, codebook_setup->dimensions);
254 goto error;
255 }
256 entries=get_bits(gb, 24);
257 if (entries>V_MAX_VLCS) {
258 av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook has too many entries (%"PRIdFAST32"). \n", cb, entries);
259 goto error;
260 }
261
262 ordered=get_bits1(gb);
263
264 AV_DEBUG(" codebook_dimensions %d, codebook_entries %d \n", codebook_setup->dimensions, entries);
265
266 if (!ordered) {
267 uint_fast16_t ce;
268 uint_fast8_t flag;
269 uint_fast8_t sparse=get_bits1(gb);
270
271 AV_DEBUG(" not ordered \n");
272
273 if (sparse) {
274 AV_DEBUG(" sparse \n");
275
276 used_entries=0;
277 for(ce=0;ce<entries;++ce) {
278 flag=get_bits1(gb);
279 if (flag) {
280 tmp_vlc_bits[ce]=get_bits(gb, 5)+1;
281 ++used_entries;
282 }
283 else tmp_vlc_bits[ce]=0;
284 }
285 } else {
286 AV_DEBUG(" not sparse \n");
287
288 used_entries=entries;
289 for(ce=0;ce<entries;++ce) {
290 tmp_vlc_bits[ce]=get_bits(gb, 5)+1;
291 }
292 }
293 } else {
294 uint_fast16_t current_entry=0;
295 uint_fast8_t current_length=get_bits(gb, 5)+1;
296
297 AV_DEBUG(" ordered, current length: %d \n", current_length); //FIXME
298
299 used_entries=entries;
300 for(;current_entry<used_entries;++current_length) {
301 uint_fast16_t i, number;
302
303 AV_DEBUG(" number bits: %d ", ilog(entries - current_entry));
304
305 number=get_bits(gb, ilog(entries - current_entry));
306
307 AV_DEBUG(" number: %d \n", number);
308
309 for(i=current_entry;i<number+current_entry;++i) {
310 if (i<used_entries) tmp_vlc_bits[i]=current_length;
311 }
312
313 current_entry+=number;
314 }
315 if (current_entry>used_entries) {
316 av_log(vc->avccontext, AV_LOG_ERROR, " More codelengths than codes in codebook. \n");
317 goto error;
318 }
319 }
320
321 codebook_setup->lookup_type=get_bits(gb, 4);
322
323 AV_DEBUG(" lookup type: %d : %s \n", codebook_setup->lookup_type, codebook_setup->lookup_type ? "vq" : "no lookup" );
324
325 // If the codebook is used for (inverse) VQ, calculate codevectors.
326
327 if (codebook_setup->lookup_type==1) {
328 uint_fast16_t i, j, k;
329 uint_fast16_t codebook_lookup_values=ff_vorbis_nth_root(entries, codebook_setup->dimensions);
330 uint_fast16_t codebook_multiplicands[codebook_lookup_values];
331
332 float codebook_minimum_value=vorbisfloat2float(get_bits_long(gb, 32));
333 float codebook_delta_value=vorbisfloat2float(get_bits_long(gb, 32));
334 uint_fast8_t codebook_value_bits=get_bits(gb, 4)+1;
335 uint_fast8_t codebook_sequence_p=get_bits1(gb);
336
337 AV_DEBUG(" We expect %d numbers for building the codevectors. \n", codebook_lookup_values);
338 AV_DEBUG(" delta %f minmum %f \n", codebook_delta_value, codebook_minimum_value);
339
340 for(i=0;i<codebook_lookup_values;++i) {
341 codebook_multiplicands[i]=get_bits(gb, codebook_value_bits);
342
343 AV_DEBUG(" multiplicands*delta+minmum : %e \n", (float)codebook_multiplicands[i]*codebook_delta_value+codebook_minimum_value);
344 AV_DEBUG(" multiplicand %d \n", codebook_multiplicands[i]);
345 }
346
347 // Weed out unused vlcs and build codevector vector
348 codebook_setup->codevectors=used_entries ? av_mallocz(used_entries*codebook_setup->dimensions * sizeof(float)) : NULL;
349 for(j=0, i=0;i<entries;++i) {
350 uint_fast8_t dim=codebook_setup->dimensions;
351
352 if (tmp_vlc_bits[i]) {
353 float last=0.0;
354 uint_fast32_t lookup_offset=i;
355
356 #ifdef V_DEBUG
357 av_log(vc->avccontext, AV_LOG_INFO, "Lookup offset %d ,", i);
358 #endif
359
360 for(k=0;k<dim;++k) {
361 uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values;
362 codebook_setup->codevectors[j*dim+k]=codebook_multiplicands[multiplicand_offset]*codebook_delta_value+codebook_minimum_value+last;
363 if (codebook_sequence_p) {
364 last=codebook_setup->codevectors[j*dim+k];
365 }
366 lookup_offset/=codebook_lookup_values;
367 }
368 tmp_vlc_bits[j]=tmp_vlc_bits[i];
369
370 #ifdef V_DEBUG
371 av_log(vc->avccontext, AV_LOG_INFO, "real lookup offset %d, vector: ", j);
372 for(k=0;k<dim;++k) {
373 av_log(vc->avccontext, AV_LOG_INFO, " %f ", codebook_setup->codevectors[j*dim+k]);
374 }
375 av_log(vc->avccontext, AV_LOG_INFO, "\n");
376 #endif
377
378 ++j;
379 }
380 }
381 if (j!=used_entries) {
382 av_log(vc->avccontext, AV_LOG_ERROR, "Bug in codevector vector building code. \n");
383 goto error;
384 }
385 entries=used_entries;
386 }
387 else if (codebook_setup->lookup_type>=2) {
388 av_log(vc->avccontext, AV_LOG_ERROR, "Codebook lookup type not supported. \n");
389 goto error;
390 }
391
392 // Initialize VLC table
393 if (ff_vorbis_len2vlc(tmp_vlc_bits, tmp_vlc_codes, entries)) {
394 av_log(vc->avccontext, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");
395 goto error;
396 }
397 codebook_setup->maxdepth=0;
398 for(t=0;t<entries;++t)
399 if (tmp_vlc_bits[t]>=codebook_setup->maxdepth) codebook_setup->maxdepth=tmp_vlc_bits[t];
400
401 if(codebook_setup->maxdepth > 3*V_NB_BITS) codebook_setup->nb_bits=V_NB_BITS2;
402 else codebook_setup->nb_bits=V_NB_BITS;
403
404 codebook_setup->maxdepth=(codebook_setup->maxdepth+codebook_setup->nb_bits-1)/codebook_setup->nb_bits;
405
406 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)) {
407 av_log(vc->avccontext, AV_LOG_ERROR, " Error generating vlc tables. \n");
408 goto error;
409 }
410 }
411
412 av_free(tmp_vlc_bits);
413 av_free(tmp_vlc_codes);
414 return 0;
415
416 // Error:
417 error:
418 av_free(tmp_vlc_bits);
419 av_free(tmp_vlc_codes);
420 return 1;
421 }
422
423 // Process time domain transforms part (unused in Vorbis I)
424
425 static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc) {
426 GetBitContext *gb=&vc->gb;
427 uint_fast8_t i;
428 uint_fast8_t vorbis_time_count=get_bits(gb, 6)+1;
429
430 for(i=0;i<vorbis_time_count;++i) {
431 uint_fast16_t vorbis_tdtransform=get_bits(gb, 16);
432
433 AV_DEBUG(" Vorbis time domain transform %d: %d \n", vorbis_time_count, vorbis_tdtransform);
434
435 if (vorbis_tdtransform) {
436 av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n");
437 return 1;
438 }
439 }
440 return 0;
441 }
442
443 // Process floors part
444
445 static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,
446 vorbis_floor_data *vfu, float *vec);
447 static void create_map( vorbis_context * vc, uint_fast8_t floor_number );
448 static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc,
449 vorbis_floor_data *vfu, float *vec);
450 static int vorbis_parse_setup_hdr_floors(vorbis_context *vc) {
451 GetBitContext *gb=&vc->gb;
452 uint_fast16_t i,j,k;
453
454 vc->floor_count=get_bits(gb, 6)+1;
455
456 vc->floors=av_mallocz(vc->floor_count * sizeof(vorbis_floor));
457
458 for (i=0;i<vc->floor_count;++i) {
459 vorbis_floor *floor_setup=&vc->floors[i];
460
461 floor_setup->floor_type=get_bits(gb, 16);
462
463 AV_DEBUG(" %d. floor type %d \n", i, floor_setup->floor_type);
464
465 if (floor_setup->floor_type==1) {
466 uint_fast8_t maximum_class=0;
467 uint_fast8_t rangebits;
468 uint_fast16_t floor1_values=2;
469
470 floor_setup->decode=vorbis_floor1_decode;
471
472 floor_setup->data.t1.partitions=get_bits(gb, 5);
473
474 AV_DEBUG(" %d.floor: %d partitions \n", i, floor_setup->data.t1.partitions);
475
476 for(j=0;j<floor_setup->data.t1.partitions;++j) {
477 floor_setup->data.t1.partition_class[j]=get_bits(gb, 4);
478 if (floor_setup->data.t1.partition_class[j]>maximum_class) maximum_class=floor_setup->data.t1.partition_class[j];
479
480 AV_DEBUG(" %d. floor %d partition class %d \n", i, j, floor_setup->data.t1.partition_class[j]);
481
482 }
483
484 AV_DEBUG(" maximum class %d \n", maximum_class);
485
486 floor_setup->data.t1.maximum_class=maximum_class;
487
488 for(j=0;j<=maximum_class;++j) {
489 floor_setup->data.t1.class_dimensions[j]=get_bits(gb, 3)+1;
490 floor_setup->data.t1.class_subclasses[j]=get_bits(gb, 2);
491
492 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]);
493
494 if (floor_setup->data.t1.class_subclasses[j]) {
495 floor_setup->data.t1.class_masterbook[j]=get_bits(gb, 8);
496
497 AV_DEBUG(" masterbook: %d \n", floor_setup->data.t1.class_masterbook[j]);
498 }
499
500 for(k=0;k<(1<<floor_setup->data.t1.class_subclasses[j]);++k) {
501 floor_setup->data.t1.subclass_books[j][k]=(int16_t)get_bits(gb, 8)-1;
502
503 AV_DEBUG(" book %d. : %d \n", k, floor_setup->data.t1.subclass_books[j][k]);
504 }
505 }
506
507 floor_setup->data.t1.multiplier=get_bits(gb, 2)+1;
508 floor_setup->data.t1.x_list_dim=2;
509
510 for(j=0;j<floor_setup->data.t1.partitions;++j) {
511 floor_setup->data.t1.x_list_dim+=floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];
512 }
513
514 floor_setup->data.t1.list=av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(vorbis_floor1_entry));
515
516
517 rangebits=get_bits(gb, 4);
518 floor_setup->data.t1.list[0].x = 0;
519 floor_setup->data.t1.list[1].x = (1<<rangebits);
520
521 for(j=0;j<floor_setup->data.t1.partitions;++j) {
522 for(k=0;k<floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];++k,++floor1_values) {
523 floor_setup->data.t1.list[floor1_values].x=get_bits(gb, rangebits);
524
525 AV_DEBUG(" %d. floor1 Y coord. %d \n", floor1_values, floor_setup->data.t1.list[floor1_values].x);
526 }
527 }
528
529 // Precalculate order of x coordinates - needed for decode
530 ff_vorbis_ready_floor1_list(floor_setup->data.t1.list, floor_setup->data.t1.x_list_dim);
531 }
532 else if(floor_setup->floor_type==0) {
533 uint_fast8_t max_codebook_dim=0;
534
535 floor_setup->decode=vorbis_floor0_decode;
536
537 floor_setup->data.t0.order=get_bits(gb, 8);
538 floor_setup->data.t0.rate=get_bits(gb, 16);
539 floor_setup->data.t0.bark_map_size=get_bits(gb, 16);
540 floor_setup->data.t0.amplitude_bits=get_bits(gb, 6);
541 /* zero would result in a div by zero later *
542 * 2^0 - 1 == 0 */
543 if (floor_setup->data.t0.amplitude_bits == 0) {
544 av_log(vc->avccontext, AV_LOG_ERROR,
545 "Floor 0 amplitude bits is 0.\n");
546 return 1;
547 }
548 floor_setup->data.t0.amplitude_offset=get_bits(gb, 8);
549 floor_setup->data.t0.num_books=get_bits(gb, 4)+1;
550
551 /* allocate mem for booklist */
552 floor_setup->data.t0.book_list=
553 av_malloc(floor_setup->data.t0.num_books);
554 if(!floor_setup->data.t0.book_list) { return 1; }
555 /* read book indexes */
556 {
557 int idx;
558 uint_fast8_t book_idx;
559 for (idx=0;idx<floor_setup->data.t0.num_books;++idx) {
560 book_idx=get_bits(gb, 8);
561 floor_setup->data.t0.book_list[idx]=book_idx;
562 if (vc->codebooks[book_idx].dimensions > max_codebook_dim)
563 max_codebook_dim=vc->codebooks[book_idx].dimensions;
564
565 if (floor_setup->data.t0.book_list[idx]>vc->codebook_count)
566 return 1;
567 }
568 }
569
570 create_map( vc, i );
571
572 /* allocate mem for lsp coefficients */
573 {
574 /* codebook dim is for padding if codebook dim doesn't *
575 * divide order+1 then we need to read more data */
576 floor_setup->data.t0.lsp=
577 av_malloc((floor_setup->data.t0.order+1 + max_codebook_dim)
578 * sizeof(float));
579 if(!floor_setup->data.t0.lsp) { return 1; }
580 }
581
582 #ifdef V_DEBUG /* debug output parsed headers */
583 AV_DEBUG("floor0 order: %u\n", floor_setup->data.t0.order);
584 AV_DEBUG("floor0 rate: %u\n", floor_setup->data.t0.rate);
585 AV_DEBUG("floor0 bark map size: %u\n",
586 floor_setup->data.t0.bark_map_size);
587 AV_DEBUG("floor0 amplitude bits: %u\n",
588 floor_setup->data.t0.amplitude_bits);
589 AV_DEBUG("floor0 amplitude offset: %u\n",
590 floor_setup->data.t0.amplitude_offset);
591 AV_DEBUG("floor0 number of books: %u\n",
592 floor_setup->data.t0.num_books);
593 AV_DEBUG("floor0 book list pointer: %p\n",
594 floor_setup->data.t0.book_list);
595 {
596 int idx;
597 for (idx=0;idx<floor_setup->data.t0.num_books;++idx) {
598 AV_DEBUG( " Book %d: %u\n",
599 idx+1,
600 floor_setup->data.t0.book_list[idx] );
601 }
602 }
603 #endif
604 }
605 else {
606 av_log(vc->avccontext, AV_LOG_ERROR, "Invalid floor type!\n");
607 return 1;
608 }
609 }
610 return 0;
611 }
612
613 // Process residues part
614
615 static int vorbis_parse_setup_hdr_residues(vorbis_context *vc){
616 GetBitContext *gb=&vc->gb;
617 uint_fast8_t i, j, k;
618
619 vc->residue_count=get_bits(gb, 6)+1;
620 vc->residues=av_mallocz(vc->residue_count * sizeof(vorbis_residue));
621
622 AV_DEBUG(" There are %d residues. \n", vc->residue_count);
623
624 for(i=0;i<vc->residue_count;++i) {
625 vorbis_residue *res_setup=&vc->residues[i];
626 uint_fast8_t cascade[64];
627 uint_fast8_t high_bits;
628 uint_fast8_t low_bits;
629
630 res_setup->type=get_bits(gb, 16);
631
632 AV_DEBUG(" %d. residue type %d \n", i, res_setup->type);
633
634 res_setup->begin=get_bits(gb, 24);
635 res_setup->end=get_bits(gb, 24);
636 res_setup->partition_size=get_bits(gb, 24)+1;
637 res_setup->classifications=get_bits(gb, 6)+1;
638 res_setup->classbook=get_bits(gb, 8);
639
640 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,
641 res_setup->classifications, res_setup->classbook);
642
643 for(j=0;j<res_setup->classifications;++j) {
644 high_bits=0;
645 low_bits=get_bits(gb, 3);
646 if (get_bits1(gb)) {
647 high_bits=get_bits(gb, 5);
648 }
649 cascade[j]=(high_bits<<3)+low_bits;
650
651 AV_DEBUG(" %d class casscade depth: %d \n", j, ilog(cascade[j]));
652 }
653
654 res_setup->maxpass=0;
655 for(j=0;j<res_setup->classifications;++j) {
656 for(k=0;k<8;++k) {
657 if (cascade[j]&(1<<k)) {
658 res_setup->books[j][k]=get_bits(gb, 8);
659
660 AV_DEBUG(" %d class casscade depth %d book: %d \n", j, k, res_setup->books[j][k]);
661
662 if (k>res_setup->maxpass) {
663 res_setup->maxpass=k;
664 }
665 } else {
666 res_setup->books[j][k]=-1;
667 }
668 }
669 }
670 }
671 return 0;
672 }
673
674 // Process mappings part
675
676 static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc) {
677 GetBitContext *gb=&vc->gb;
678 uint_fast8_t i, j;
679
680 vc->mapping_count=get_bits(gb, 6)+1;
681 vc->mappings=av_mallocz(vc->mapping_count * sizeof(vorbis_mapping));
682
683 AV_DEBUG(" There are %d mappings. \n", vc->mapping_count);
684
685 for(i=0;i<vc->mapping_count;++i) {
686 vorbis_mapping *mapping_setup=&vc->mappings[i];
687
688 if (get_bits(gb, 16)) {
689 av_log(vc->avccontext, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n");
690 return 1;
691 }
692 if (get_bits1(gb)) {
693 mapping_setup->submaps=get_bits(gb, 4)+1;
694 } else {
695 mapping_setup->submaps=1;
696 }
697
698 if (get_bits1(gb)) {
699 mapping_setup->coupling_steps=get_bits(gb, 8)+1;
700 mapping_setup->magnitude=av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
701 mapping_setup->angle =av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
702 for(j=0;j<mapping_setup->coupling_steps;++j) {
703 mapping_setup->magnitude[j]=get_bits(gb, ilog(vc->audio_channels-1));
704 mapping_setup->angle[j]=get_bits(gb, ilog(vc->audio_channels-1));
705 // FIXME: sanity checks
706 }
707 } else {
708 mapping_setup->coupling_steps=0;
709 }
710
711 AV_DEBUG(" %d mapping coupling steps: %d \n", i, mapping_setup->coupling_steps);
712
713 if(get_bits(gb, 2)) {
714 av_log(vc->avccontext, AV_LOG_ERROR, "%d. mapping setup data invalid. \n", i);
715 return 1; // following spec.
716 }
717
718 if (mapping_setup->submaps>1) {
719 mapping_setup->mux=av_mallocz(vc->audio_channels * sizeof(uint_fast8_t));
720 for(j=0;j<vc->audio_channels;++j) {
721 mapping_setup->mux[j]=get_bits(gb, 4);
722 }
723 }
724
725 for(j=0;j<mapping_setup->submaps;++j) {
726 skip_bits(gb, 8); // FIXME check?
727 mapping_setup->submap_floor[j]=get_bits(gb, 8);
728 mapping_setup->submap_residue[j]=get_bits(gb, 8);
729
730 AV_DEBUG(" %d mapping %d submap : floor %d, residue %d \n", i, j, mapping_setup->submap_floor[j], mapping_setup->submap_residue[j]);
731 }
732 }
733 return 0;
734 }
735
736 // Process modes part
737
738 static void create_map( vorbis_context * vc, uint_fast8_t floor_number )
739 {
740 vorbis_floor * floors=vc->floors;
741 vorbis_floor0 * vf;
742 int idx;
743 int_fast8_t blockflag;
744 int_fast32_t * map;
745 int_fast32_t n; //TODO: could theoretically be smaller?
746
747 for (blockflag=0;blockflag<2;++blockflag)
748 {
749 n=vc->blocksize[blockflag]/2;
750 floors[floor_number].data.t0.map[blockflag]=
751 av_malloc((n+1) * sizeof(int_fast32_t)); // n+sentinel
752
753 map=floors[floor_number].data.t0.map[blockflag];
754 vf=&floors[floor_number].data.t0;
755
756 for (idx=0; idx<n;++idx) {
757 map[idx]=floor( BARK((vf->rate*idx)/(2.0f*n)) *
758 ((vf->bark_map_size)/
759 BARK(vf->rate/2.0f )) );
760 if (vf->bark_map_size-1 < map[idx]) {
761 map[idx]=vf->bark_map_size-1;
762 }
763 }
764 map[n]=-1;
765 vf->map_size[blockflag]=n;
766 }
767
768 # ifdef V_DEBUG
769 for(idx=0;idx<=n;++idx) {
770 AV_DEBUG("floor0 map: map at pos %d is %d\n",
771 idx, map[idx]);
772 }
773 # endif
774 }
775
776 static int vorbis_parse_setup_hdr_modes(vorbis_context *vc) {
777 GetBitContext *gb=&vc->gb;
778 uint_fast8_t i;
779
780 vc->mode_count=get_bits(gb, 6)+1;
781 vc->modes=av_mallocz(vc->mode_count * sizeof(vorbis_mode));
782
783 AV_DEBUG(" There are %d modes.\n", vc->mode_count);
784
785 for(i=0;i<vc->mode_count;++i) {
786 vorbis_mode *mode_setup=&vc->modes[i];
787
788 mode_setup->blockflag=get_bits1(gb);
789 mode_setup->windowtype=get_bits(gb, 16); //FIXME check
790 mode_setup->transformtype=get_bits(gb, 16); //FIXME check
791 mode_setup->mapping=get_bits(gb, 8); //FIXME check
792
793 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);
794 }
795 return 0;
796 }
797
798 // Process the whole setup header using the functions above
799
800 static int vorbis_parse_setup_hdr(vorbis_context *vc) {
801 GetBitContext *gb=&vc->gb;
802
803 if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') ||
804 (get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') ||
805 (get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) {
806 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n");
807 return 1;
808 }
809
810 if (vorbis_parse_setup_hdr_codebooks(vc)) {
811 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n");
812 return 2;
813 }
814 if (vorbis_parse_setup_hdr_tdtransforms(vc)) {
815 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n");
816 return 3;
817 }
818 if (vorbis_parse_setup_hdr_floors(vc)) {
819 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n");
820 return 4;
821 }
822 if (vorbis_parse_setup_hdr_residues(vc)) {
823 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n");
824 return 5;
825 }
826 if (vorbis_parse_setup_hdr_mappings(vc)) {
827 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n");
828 return 6;
829 }
830 if (vorbis_parse_setup_hdr_modes(vc)) {
831 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n");
832 return 7;
833 }
834 if (!get_bits1(gb)) {
835 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n");
836 return 8; // framing flag bit unset error
837 }
838
839 return 0;
840 }
841
842 // Process the identification header
843
844 static int vorbis_parse_id_hdr(vorbis_context *vc){
845 GetBitContext *gb=&vc->gb;
846 uint_fast8_t bl0, bl1;
847
848 if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') ||
849 (get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') ||
850 (get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) {
851 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n");
852 return 1;
853 }
854
855 vc->version=get_bits_long(gb, 32); //FIXME check 0
856 vc->audio_channels=get_bits(gb, 8); //FIXME check >0
857 vc->audio_samplerate=get_bits_long(gb, 32); //FIXME check >0
858 vc->bitrate_maximum=get_bits_long(gb, 32);
859 vc->bitrate_nominal=get_bits_long(gb, 32);
860 vc->bitrate_minimum=get_bits_long(gb, 32);
861 bl0=get_bits(gb, 4);
862 bl1=get_bits(gb, 4);
863 vc->blocksize[0]=(1<<bl0);
864 vc->blocksize[1]=(1<<bl1);
865 if (bl0>13 || bl0<6 || bl1>13 || bl1<6 || bl1<bl0) {
866 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n");
867 return 3;
868 }
869 // output format int16
870 if (vc->blocksize[1]/2 * vc->audio_channels * 2 >
871 AVCODEC_MAX_AUDIO_FRAME_SIZE) {
872 av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis channel count makes "
873 "output packets too large.\n");
874 return 4;
875 }
876 vc->win[0]=ff_vorbis_vwin[bl0-6];
877 vc->win[1]=ff_vorbis_vwin[bl1-6];
878
879 if(vc->exp_bias){
880 int i, j;
881 for(j=0; j<2; j++){
882 float *win = av_malloc(vc->blocksize[j]/2 * sizeof(float));
883 for(i=0; i<vc->blocksize[j]/2; i++)
884 win[i] = vc->win[j][i] * (1<<15);
885 vc->win[j] = win;
886 }
887 }
888
889 if ((get_bits1(gb)) == 0) {
890 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n");
891 return 2;
892 }
893
894 vc->channel_residues= av_malloc((vc->blocksize[1]/2)*vc->audio_channels * sizeof(float));
895 vc->channel_floors = av_malloc((vc->blocksize[1]/2)*vc->audio_channels * sizeof(float));
896 vc->saved = av_mallocz((vc->blocksize[1]/4)*vc->audio_channels * sizeof(float));
897 vc->previous_window=0;
898
899 ff_mdct_init(&vc->mdct[0], bl0, 1);
900 ff_mdct_init(&vc->mdct[1], bl1, 1);
901
902 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 ",
903 vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize[0], vc->blocksize[1]);
904
905 /*
906 BLK=vc->blocksize[0];
907 for(i=0;i<BLK/2;++i) {
908 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)));
909 }
910 */
911
912 return 0;
913 }
914
915 // Process the extradata using the functions above (identification header, setup header)
916
917 static av_cold int vorbis_decode_init(AVCodecContext *avccontext) {
918 vorbis_context *vc = avccontext->priv_data ;
919 uint8_t *headers = avccontext->extradata;
920 int headers_len=avccontext->extradata_size;
921 uint8_t *header_start[3];
922 int header_len[3];
923 GetBitContext *gb = &(vc->gb);
924 int hdr_type;
925
926 vc->avccontext = avccontext;
927 dsputil_init(&vc->dsp, avccontext);
928
929 if(vc->dsp.float_to_int16_interleave == ff_float_to_int16_interleave_c) {
930 vc->add_bias = 385;
931 vc->exp_bias = 0;
932 } else {
933 vc->add_bias = 0;
934 vc->exp_bias = 15<<23;
935 }
936
937 if (!headers_len) {
938 av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
939 return -1;
940 }
941
942 if (ff_split_xiph_headers(headers, headers_len, 30, header_start, header_len) < 0) {
943 av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
944 return -1;
945 }
946
947 init_get_bits(gb, header_start[0], header_len[0]*8);
948 hdr_type=get_bits(gb, 8);
949 if (hdr_type!=1) {
950 av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n");
951 return -1;
952 }
953 if (vorbis_parse_id_hdr(vc)) {
954 av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n");
955 vorbis_free(vc);
956 return -1;
957 }
958
959 init_get_bits(gb, header_start[2], header_len[2]*8);
960 hdr_type=get_bits(gb, 8);
961 if (hdr_type!=5) {
962 av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");
963 vorbis_free(vc);
964 return -1;
965 }
966 if (vorbis_parse_setup_hdr(vc)) {
967 av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");
968 vorbis_free(vc);
969 return -1;
970 }
971
972 avccontext->channels = vc->audio_channels;
973 avccontext->sample_rate = vc->audio_samplerate;
974 avccontext->frame_size = FFMIN(vc->blocksize[0], vc->blocksize[1])>>2;
975 avccontext->sample_fmt = SAMPLE_FMT_S16;
976
977 return 0 ;
978 }
979
980 // Decode audiopackets -------------------------------------------------
981
982 // Read and decode floor
983
984 static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,
985 vorbis_floor_data *vfu, float *vec) {
986 vorbis_floor0 * vf=&vfu->t0;
987 float * lsp=vf->lsp;
988 uint_fast32_t amplitude;
989 uint_fast32_t book_idx;
990 uint_fast8_t blockflag=vc->modes[vc->mode_number].blockflag;
991
992 amplitude=get_bits(&vc->gb, vf->amplitude_bits);
993 if (amplitude>0) {
994 float last = 0;
995 uint_fast16_t lsp_len = 0;
996 uint_fast16_t idx;
997 vorbis_codebook codebook;
998
999 book_idx=get_bits(&vc->gb, ilog(vf->num_books));
1000 if ( book_idx >= vf->num_books ) {
1001 av_log( vc->avccontext, AV_LOG_ERROR,
1002 "floor0 dec: booknumber too high!\n" );
1003 book_idx= 0;
1004 //FIXME: look above
1005 }
1006 AV_DEBUG( "floor0 dec: booknumber: %u\n", book_idx );
1007 codebook=vc->codebooks[vf->book_list[book_idx]];
1008
1009 while (lsp_len<vf->order) {
1010 int vec_off;
1011
1012 AV_DEBUG( "floor0 dec: book dimension: %d\n", codebook.dimensions );
1013 AV_DEBUG( "floor0 dec: maximum depth: %d\n", codebook.maxdepth );
1014 /* read temp vector */
1015 vec_off=get_vlc2(&vc->gb,
1016 codebook.vlc.table,
1017 codebook.nb_bits,
1018 codebook.maxdepth ) *
1019 codebook.dimensions;
1020 AV_DEBUG( "floor0 dec: vector offset: %d\n", vec_off );
1021 /* copy each vector component and add last to it */
1022 for (idx=0; idx<codebook.dimensions; ++idx) {
1023 lsp[lsp_len+idx]=codebook.codevectors[vec_off+idx]+last;
1024 }
1025 last=lsp[lsp_len+idx-1]; /* set last to last vector component */
1026
1027 lsp_len += codebook.dimensions;
1028 }
1029 #ifdef V_DEBUG
1030 /* DEBUG: output lsp coeffs */
1031 {
1032 int idx;
1033 for ( idx = 0; idx < lsp_len; ++idx )
1034 AV_DEBUG("floor0 dec: coeff at %d is %f\n", idx, lsp[idx] );
1035 }
1036 #endif
1037
1038 /* synthesize floor output vector */
1039 {
1040 int i;
1041 int order=vf->order;
1042 float wstep=M_PI/vf->bark_map_size;
1043
1044 for(i=0;i<order;i++) { lsp[i]=2.0f*cos(lsp[i]); }
1045
1046 AV_DEBUG("floor0 synth: map_size=%d; m=%d; wstep=%f\n",
1047 vf->map_size, order, wstep);
1048
1049 i=0;
1050 while(i<vf->map_size[blockflag]) {
1051 int j, iter_cond=vf->map[blockflag][i];
1052 float p=0.5f;
1053 float q=0.5f;
1054 float two_cos_w=2.0f*cos(wstep*iter_cond); // needed all times
1055
1056 /* similar part for the q and p products */
1057 for(j=0;j<order;j+=2) {
1058 q *= lsp[j] -two_cos_w;
1059 p *= lsp[j+1]-two_cos_w;
1060 }
1061 if(j==order) { // even order
1062 p *= p*(2.0f-two_cos_w);
1063 q *= q*(2.0f+two_cos_w);
1064 }
1065 else { // odd order
1066 q *= two_cos_w-lsp[j]; // one more time for q
1067
1068 /* final step and square */
1069 p *= p*(4.f-two_cos_w*two_cos_w);
1070 q *= q;
1071 }
1072
1073 /* calculate linear floor value */
1074 {
1075 q=exp( (
1076 ( (amplitude*vf->amplitude_offset)/
1077 (((1<<vf->amplitude_bits)-1) * sqrt(p+q)) )
1078 - vf->amplitude_offset ) * .11512925f
1079 );
1080 }
1081
1082 /* fill vector */
1083 do { vec[i]=q; ++i; }while(vf->map[blockflag][i]==iter_cond);
1084 }
1085 }
1086 }
1087 else {
1088 /* this channel is unused */
1089 return 1;
1090 }
1091
1092 AV_DEBUG(" Floor0 decoded\n");
1093
1094 return 0;
1095 }
1096
1097 static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc, vorbis_floor_data *vfu, float *vec) {
1098 vorbis_floor1 * vf=&vfu->t1;
1099 GetBitContext *gb=&vc->gb;
1100 uint_fast16_t range_v[4]={ 256, 128, 86, 64 };
1101 uint_fast16_t range=range_v[vf->multiplier-1];
1102 uint_fast16_t floor1_Y[vf->x_list_dim];
1103 uint_fast16_t floor1_Y_final[vf->x_list_dim];
1104 int floor1_flag[vf->x_list_dim];
1105 uint_fast8_t class_;
1106 uint_fast8_t cdim;
1107 uint_fast8_t cbits;
1108 uint_fast8_t csub;
1109 uint_fast8_t cval;
1110 int_fast16_t book;
1111 uint_fast16_t offset;
1112 uint_fast16_t i,j;
1113 /*u*/int_fast16_t adx, ady, off, predicted; // WTF ? dy/adx= (unsigned)dy/adx ?
1114 int_fast16_t dy, err;
1115
1116
1117 if (!get_bits1(gb)) return 1; // silence
1118
1119 // Read values (or differences) for the floor's points
1120
1121 floor1_Y[0]=get_bits(gb, ilog(range-1));
1122 floor1_Y[1]=get_bits(gb, ilog(range-1));
1123
1124 AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);
1125
1126 offset=2;
1127 for(i=0;i<vf->partitions;++i) {
1128 class_=vf->partition_class[i];
1129 cdim=vf->class_dimensions[class_];
1130 cbits=vf->class_subclasses[class_];
1131 csub=(1<<cbits)-1;
1132 cval=0;
1133
1134 AV_DEBUG("Cbits %d \n", cbits);
1135
1136 if (cbits) { // this reads all subclasses for this partition's class
1137 cval=get_vlc2(gb, vc->codebooks[vf->class_masterbook[class_]].vlc.table,
1138 vc->codebooks[vf->class_masterbook[class_]].nb_bits, 3);
1139 }
1140
1141 for(j=0;j<cdim;++j) {
1142 book=vf->subclass_books[class_][cval & csub];
1143
1144 AV_DEBUG("book %d Cbits %d cval %d bits:%d \n", book, cbits, cval, get_bits_count(gb));
1145
1146 cval=cval>>cbits;
1147 if (book>-1) {
1148 floor1_Y[offset+j]=get_vlc2(gb, vc->codebooks[book].vlc.table,
1149 vc->codebooks[book].nb_bits, 3);
1150 } else {
1151 floor1_Y[offset+j]=0;
1152 }
1153
1154 AV_DEBUG(" floor(%d) = %d \n", vf->list[offset+j].x, floor1_Y[offset+j]);
1155 }
1156 offset+=cdim;
1157 }
1158
1159 // Amplitude calculation from the differences
1160
1161 floor1_flag[0]=1;
1162 floor1_flag[1]=1;
1163 floor1_Y_final[0]=floor1_Y[0];
1164 floor1_Y_final[1]=floor1_Y[1];
1165
1166 for(i=2;i<vf->x_list_dim;++i) {
1167 uint_fast16_t val, highroom, lowroom, room;
1168 uint_fast16_t high_neigh_offs;
1169 uint_fast16_t low_neigh_offs;
1170
1171 low_neigh_offs=vf->list[i].low;
1172 high_neigh_offs=vf->list[i].high;
1173 dy=floor1_Y_final[high_neigh_offs]-floor1_Y_final[low_neigh_offs]; // render_point begin
1174 adx=vf->list[high_neigh_offs].x-vf->list[low_neigh_offs].x;
1175 ady= FFABS(dy);
1176 err=ady*(vf->list[i].x-vf->list[low_neigh_offs].x);
1177 off=(int16_t)err/(int16_t)adx;
1178 if (dy<0) {
1179 predicted=floor1_Y_final[low_neigh_offs]-off;
1180 } else {
1181 predicted=floor1_Y_final[low_neigh_offs]+off;
1182 } // render_point end
1183
1184 val=floor1_Y[i];
1185 highroom=range-predicted;
1186 lowroom=predicted;
1187 if (highroom < lowroom) {
1188 room=highroom*2;
1189 } else {
1190 room=lowroom*2; // SPEC mispelling
1191 }
1192 if (val) {
1193 floor1_flag[low_neigh_offs]=1;
1194 floor1_flag[high_neigh_offs]=1;
1195 floor1_flag[i]=1;
1196 if (val>=room) {
1197 if (highroom > lowroom) {
1198 floor1_Y_final[i]=val-lowroom+predicted;
1199 } else {
1200 floor1_Y_final[i]=predicted-val+highroom-1;
1201 }
1202 } else {
1203 if (val & 1) {
1204 floor1_Y_final[i]=predicted-(val+1)/2;
1205 } else {
1206 floor1_Y_final[i]=predicted+val/2;
1207 }
1208 }
1209 } else {
1210 floor1_flag[i]=0;
1211 floor1_Y_final[i]=predicted;
1212 }
1213
1214 AV_DEBUG(" Decoded floor(%d) = %d / val %d \n", vf->list[i].x, floor1_Y_final[i], val);
1215 }
1216
1217 // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?
1218
1219 ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);
1220
1221 AV_DEBUG(" Floor decoded\n");
1222
1223 return 0;
1224 }
1225
1226 // Read and decode residue
1227
1228 static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc, vorbis_residue *vr, uint_fast8_t ch, uint_fast8_t *do_not_decode, float *vec, uint_fast16_t vlen, int vr_type) {
1229 GetBitContext *gb=&vc->gb;
1230 uint_fast8_t c_p_c=vc->codebooks[vr->classbook].dimensions;
1231 uint_fast16_t n_to_read=vr->end-vr->begin;
1232 uint_fast16_t ptns_to_read=n_to_read/vr->partition_size;
1233 uint_fast8_t classifs[ptns_to_read*vc->audio_channels];
1234 uint_fast8_t pass;
1235 uint_fast8_t ch_used;
1236 uint_fast8_t i,j,l;
1237 uint_fast16_t k;
1238
1239 if (vr_type==2) {
1240 for(j=1;j<ch;++j) {
1241 do_not_decode[0]&=do_not_decode[j]; // FIXME - clobbering input
1242 }
1243 if (do_not_decode[0]) return 0;
1244 ch_used=1;
1245 } else {
1246 ch_used=ch;
1247 }
1248
1249 AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d cpc %d \n", ch, c_p_c);
1250
1251 for(pass=0;pass<=vr->maxpass;++pass) { // FIXME OPTIMIZE?
1252 uint_fast16_t voffset;
1253 uint_fast16_t partition_count;
1254 uint_fast16_t j_times_ptns_to_read;
1255
1256 voffset=vr->begin;
1257 for(partition_count=0;partition_count<ptns_to_read;) { // SPEC error
1258 if (!pass) {
1259 uint_fast32_t inverse_class = ff_inverse[vr->classifications];
1260 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {
1261 if (!do_not_decode[j]) {
1262 uint_fast32_t temp=get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,
1263 vc->codebooks[vr->classbook].nb_bits, 3);
1264
1265 AV_DEBUG("Classword: %d \n", temp);
1266
1267 assert(vr->classifications > 1 && temp<=65536); //needed for inverse[]
1268 for(i=0;i<c_p_c;++i) {
1269 uint_fast32_t temp2;
1270
1271 temp2=(((uint_fast64_t)temp) * inverse_class)>>32;
1272 if (partition_count+c_p_c-1-i < ptns_to_read) {
1273 classifs[j_times_ptns_to_read+partition_count+c_p_c-1-i]=temp-temp2*vr->classifications;
1274 }
1275 temp=temp2;
1276 }
1277 }
1278 j_times_ptns_to_read+=ptns_to_read;
1279 }
1280 }
1281 for(i=0;(i<c_p_c) && (partition_count<ptns_to_read);++i) {
1282 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {
1283 uint_fast16_t voffs;
1284
1285 if (!do_not_decode[j]) {
1286 uint_fast8_t vqclass=classifs[j_times_ptns_to_read+partition_count];
1287 int_fast16_t vqbook=vr->books[vqclass][pass];
1288
1289 if (vqbook>=0 && vc->codebooks[vqbook].codevectors) {
1290 uint_fast16_t coffs;
1291 unsigned dim= vc->codebooks[vqbook].dimensions; // not uint_fast8_t: 64bit is slower here on amd64
1292 uint_fast16_t step= dim==1 ? vr->partition_size
1293 : FASTDIV(vr->partition_size, dim);
1294 vorbis_codebook codebook= vc->codebooks[vqbook];
1295
1296 if (vr_type==0) {
1297
1298 voffs=voffset+j*vlen;
1299 for(k=0;k<step;++k) {
1300 coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1301 for(l=0;l<dim;++l) {
1302 vec[voffs+k+l*step]+=codebook.codevectors[coffs+l]; // FPMATH
1303 }
1304 }
1305 }
1306 else if (vr_type==1) {
1307 voffs=voffset+j*vlen;
1308 for(k=0;k<step;++k) {
1309 coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1310 for(l=0;l<dim;++l, ++voffs) {
1311 vec[voffs]+=codebook.codevectors[coffs+l]; // FPMATH
1312
1313 AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d \n", pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);
1314 }
1315 }
1316 }
1317 else if (vr_type==2 && ch==2 && (voffset&1)==0 && (dim&1)==0) { // most frequent case optimized
1318 voffs=voffset>>1;
1319
1320 if(dim==2) {
1321 for(k=0;k<step;++k) {
1322 coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;
1323 vec[voffs+k ]+=codebook.codevectors[coffs ]; // FPMATH
1324 vec[voffs+k+vlen]+=codebook.codevectors[coffs+1]; // FPMATH
1325 }
1326 } else if(dim==4) {
1327 for(k=0;k<step;++k, voffs+=2) {
1328 coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4;
1329 vec[voffs ]+=codebook.codevectors[coffs ]; // FPMATH
1330 vec[voffs+1 ]+=codebook.codevectors[coffs+2]; // FPMATH
1331 vec[voffs+vlen ]+=codebook.codevectors[coffs+1]; // FPMATH
1332 vec[voffs+vlen+1]+=codebook.codevectors[coffs+3]; // FPMATH
1333 }
1334 } else
1335 for(k=0;k<step;++k) {
1336 coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1337 for(l=0;l<dim;l+=2, voffs++) {
1338 vec[voffs ]+=codebook.codevectors[coffs+l ]; // FPMATH
1339 vec[voffs+vlen]+=codebook.codevectors[coffs+l+1]; // FPMATH
1340
1341 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);
1342 }
1343 }
1344
1345 }
1346 else if (vr_type==2) {
1347 voffs=voffset;
1348
1349 for(k=0;k<step;++k) {
1350 coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1351 for(l=0;l<dim;++l, ++voffs) {
1352 vec[voffs/ch+(voffs%ch)*vlen]+=codebook.codevectors[coffs+l]; // FPMATH FIXME use if and counter instead of / and %
1353
1354 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);
1355 }
1356 }
1357 }
1358 }
1359 }
1360 j_times_ptns_to_read+=ptns_to_read;
1361 }
1362 ++partition_count;
1363 voffset+=vr->partition_size;
1364 }
1365 }
1366 }
1367 return 0;
1368 }
1369
1370 static inline 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)
1371 {
1372 if (vr->type==2)
1373 return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 2);
1374 else if (vr->type==1)
1375 return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 1);
1376 else if (vr->type==0)
1377 return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 0);
1378 else {
1379 av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");
1380 return 1;
1381 }
1382 }
1383
1384 void vorbis_inverse_coupling(float *mag, float *ang, int blocksize)
1385 {
1386 int i;
1387 for(i=0; i<blocksize; i++)
1388 {
1389 if (mag[i]>0.0) {
1390 if (ang[i]>0.0) {
1391 ang[i]=mag[i]-ang[i];
1392 } else {
1393 float temp=ang[i];
1394 ang[i]=mag[i];
1395 mag[i]+=temp;
1396 }
1397 } else {
1398 if (ang[i]>0.0) {
1399 ang[i]+=mag[i];
1400 } else {
1401 float temp=ang[i];
1402 ang[i]=mag[i];
1403 mag[i]-=temp;
1404 }
1405 }
1406 }
1407 }
1408
1409 static void copy_normalize(float *dst, float *src, int len, int exp_bias, float add_bias)
1410 {
1411 int i;
1412 if(exp_bias) {
1413 for(i=0; i<len; i++)
1414 ((uint32_t*)dst)[i] = ((uint32_t*)src)[i] + exp_bias; // dst[k]=src[i]*(1<<bias)
1415 } else {
1416 for(i=0; i<len; i++)
1417 dst[i] = src[i] + add_bias;
1418 }
1419 }
1420
1421 // Decode the audio packet using the functions above
1422
1423 static int vorbis_parse_audio_packet(vorbis_context *vc) {
1424 GetBitContext *gb=&vc->gb;
1425
1426 uint_fast8_t previous_window=vc->previous_window;
1427 uint_fast8_t mode_number;
1428 uint_fast8_t blockflag;
1429 uint_fast16_t blocksize;
1430 int_fast32_t i,j;
1431 uint_fast8_t no_residue[vc->audio_channels];
1432 uint_fast8_t do_not_decode[vc->audio_channels];
1433 vorbis_mapping *mapping;
1434 float *ch_res_ptr=vc->channel_residues;
1435 float *ch_floor_ptr=vc->channel_floors;
1436 uint_fast8_t res_chan[vc->audio_channels];
1437 uint_fast8_t res_num=0;
1438 int_fast16_t retlen=0;
1439 float fadd_bias = vc->add_bias;
1440
1441 if (get_bits1(gb)) {
1442 av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");
1443 return -1; // packet type not audio
1444 }
1445
1446 if (vc->mode_count==1) {
1447 mode_number=0;
1448 } else {
1449 mode_number=get_bits(gb, ilog(vc->mode_count-1));
1450 }
1451 vc->mode_number=mode_number;
1452 mapping=&vc->mappings[vc->modes[mode_number].mapping];
1453
1454 AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);
1455
1456 blockflag=vc->modes[mode_number].blockflag;
1457 blocksize=vc->blocksize[blockflag];
1458 if (blockflag) {
1459 skip_bits(gb, 2); // previous_window, next_window
1460 }
1461
1462 memset(ch_res_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?
1463 memset(ch_floor_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?
1464
1465 // Decode floor
1466
1467 for(i=0;i<vc->audio_channels;++i) {
1468 vorbis_floor *floor;
1469 if (mapping->submaps>1) {
1470 floor=&vc->floors[mapping->submap_floor[mapping->mux[i]]];
1471 } else {
1472 floor=&vc->floors[mapping->submap_floor[0]];
1473 }
1474
1475 no_residue[i]=floor->decode(vc, &floor->data, ch_floor_ptr);
1476 ch_floor_ptr+=blocksize/2;
1477 }
1478
1479 // Nonzero vector propagate
1480
1481 for(i=mapping->coupling_steps-1;i>=0;--i) {
1482 if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {
1483 no_residue[mapping->magnitude[i]]=0;
1484 no_residue[mapping->angle[i]]=0;
1485 }
1486 }
1487
1488 // Decode residue
1489
1490 for(i=0;i<mapping->submaps;++i) {
1491 vorbis_residue *residue;
1492 uint_fast8_t ch=0;
1493
1494 for(j=0;j<vc->audio_channels;++j) {
1495 if ((mapping->submaps==1) || (i=mapping->mux[j])) {
1496 res_chan[j]=res_num;
1497 if (no_residue[j]) {
1498 do_not_decode[ch]=1;
1499 } else {
1500 do_not_decode[ch]=0;
1501 }
1502 ++ch;
1503 ++res_num;
1504 }
1505 }
1506 residue=&vc->residues[mapping->submap_residue[i]];
1507 vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);
1508
1509 ch_res_ptr+=ch*blocksize/2;
1510 }
1511
1512 // Inverse coupling
1513
1514 for(i=mapping->coupling_steps-1;i>=0;--i) { //warning: i has to be signed
1515 float *mag, *ang;
1516
1517 mag=vc->channel_residues+res_chan[mapping->magnitude[i]]*blocksize/2;
1518 ang=vc->channel_residues+res_chan[mapping->angle[i]]*blocksize/2;
1519 vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize/2);
1520 }
1521
1522 // Dotproduct, MDCT
1523
1524 for(j=vc->audio_channels-1;j>=0;j--) {
1525 ch_floor_ptr=vc->channel_floors+j*blocksize/2;
1526 ch_res_ptr=vc->channel_residues+res_chan[j]*blocksize/2;
1527 vc->dsp.vector_fmul(ch_floor_ptr, ch_res_ptr, blocksize/2);
1528 ff_imdct_half(&vc->mdct[blockflag], ch_res_ptr, ch_floor_ptr);
1529 }
1530
1531 // Overlap/add, save data for next overlapping FPMATH
1532
1533 retlen = (blocksize + vc->blocksize[previous_window])/4;
1534 for(j=0;j<vc->audio_channels;j++) {
1535 uint_fast16_t bs0=vc->blocksize[0];
1536 uint_fast16_t bs1=vc->blocksize[1];
1537 float *residue=vc->channel_residues+res_chan[j]*blocksize/2;
1538 float *saved=vc->saved+j*bs1/4;
1539 float *ret=vc->channel_floors+j*retlen;
1540 float *buf=residue;
1541 const float *win=vc->win[blockflag&previous_window];
1542
1543 if(blockflag == previous_window) {
1544 vc->dsp.vector_fmul_window(ret, saved, buf, win, fadd_bias, blocksize/4);
1545 } else if(blockflag > previous_window) {
1546 vc->dsp.vector_fmul_window(ret, saved, buf, win, fadd_bias, bs0/4);
1547 copy_normalize(ret+bs0/2, buf+bs0/4, (bs1-bs0)/4, vc->exp_bias, fadd_bias);
1548 } else {
1549 copy_normalize(ret, saved, (bs1-bs0)/4, vc->exp_bias, fadd_bias);
1550 vc->dsp.vector_fmul_window(ret+(bs1-bs0)/4, saved+(bs1-bs0)/4, buf, win, fadd_bias, bs0/4);
1551 }
1552 memcpy(saved, buf+blocksize/4, blocksize/4*sizeof(float));
1553 }
1554
1555 vc->previous_window = blockflag;
1556 return retlen;
1557 }
1558
1559 // Return the decoded audio packet through the standard api
1560
1561 static int vorbis_decode_frame(AVCodecContext *avccontext,
1562 void *data, int *data_size,
1563 const uint8_t *buf, int buf_size)
1564 {
1565 vorbis_context *vc = avccontext->priv_data ;
1566 GetBitContext *gb = &(vc->gb);
1567 const float *channel_ptrs[vc->audio_channels];
1568 int i;
1569
1570 int_fast16_t len;
1571
1572 if(!buf_size){
1573 return 0;
1574 }
1575
1576 AV_DEBUG("packet length %d \n", buf_size);
1577
1578 init_get_bits(gb, buf, buf_size*8);
1579
1580 len=vorbis_parse_audio_packet(vc);
1581
1582 if (len<=0) {
1583 *data_size=0;
1584 return buf_size;
1585 }
1586
1587 if (!vc->first_frame) {
1588 vc->first_frame=1;
1589 *data_size=0;
1590 return buf_size ;
1591 }
1592
1593 AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);
1594
1595 for(i=0; i<vc->audio_channels; i++)
1596 channel_ptrs[i] = vc->channel_floors+i*len;
1597 vc->dsp.float_to_int16_interleave(data, channel_ptrs, len, vc->audio_channels);
1598 *data_size=len*2*vc->audio_channels;
1599
1600 return buf_size ;
1601 }
1602
1603 // Close decoder
1604
1605 static av_cold int vorbis_decode_close(AVCodecContext *avccontext) {
1606 vorbis_context *vc = avccontext->priv_data;
1607
1608 vorbis_free(vc);
1609
1610 return 0 ;
1611 }
1612
1613 AVCodec vorbis_decoder = {
1614 "vorbis",
1615 CODEC_TYPE_AUDIO,
1616 CODEC_ID_VORBIS,
1617 sizeof(vorbis_context),
1618 vorbis_decode_init,
1619 NULL,
1620 vorbis_decode_close,
1621 vorbis_decode_frame,
1622 .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),
1623 };
1624
ffmpeg Lagarith lossless decoder