9289c82cf449ab5cf7d85497e4c021127345b108
[libav.git] / libavcodec / vorbisdec.c
1 /*
2 * This file is part of Libav.
3 *
4 * Libav is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * Libav is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with Libav; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 /**
20 * @file
21 * Vorbis I decoder
22 * @author Denes Balatoni ( dbalatoni programozo hu )
23 */
24
25 #include <inttypes.h>
26 #include <math.h>
27
28 #include "libavutil/float_dsp.h"
29
30 #define BITSTREAM_READER_LE
31 #include "avcodec.h"
32 #include "fft.h"
33 #include "get_bits.h"
34 #include "internal.h"
35 #include "vorbis.h"
36 #include "vorbisdsp.h"
37 #include "xiph.h"
38
39 #define V_NB_BITS 8
40 #define V_NB_BITS2 11
41 #define V_MAX_VLCS (1 << 16)
42 #define V_MAX_PARTITIONS (1 << 20)
43
44 typedef struct vorbis_codebook {
45 uint8_t dimensions;
46 uint8_t lookup_type;
47 uint8_t maxdepth;
48 VLC vlc;
49 float *codevectors;
50 unsigned int nb_bits;
51 } vorbis_codebook;
52
53 typedef union vorbis_floor_u vorbis_floor_data;
54 typedef struct vorbis_floor0_s vorbis_floor0;
55 typedef struct vorbis_floor1_s vorbis_floor1;
56 struct vorbis_context_s;
57 typedef
58 int (* vorbis_floor_decode_func)
59 (struct vorbis_context_s *, vorbis_floor_data *, float *);
60 typedef struct vorbis_floor {
61 uint8_t floor_type;
62 vorbis_floor_decode_func decode;
63 union vorbis_floor_u {
64 struct vorbis_floor0_s {
65 uint8_t order;
66 uint16_t rate;
67 uint16_t bark_map_size;
68 int32_t *map[2];
69 uint32_t map_size[2];
70 uint8_t amplitude_bits;
71 uint8_t amplitude_offset;
72 uint8_t num_books;
73 uint8_t *book_list;
74 float *lsp;
75 } t0;
76 struct vorbis_floor1_s {
77 uint8_t partitions;
78 uint8_t partition_class[32];
79 uint8_t class_dimensions[16];
80 uint8_t class_subclasses[16];
81 uint8_t class_masterbook[16];
82 int16_t subclass_books[16][8];
83 uint8_t multiplier;
84 uint16_t x_list_dim;
85 vorbis_floor1_entry *list;
86 } t1;
87 } data;
88 } vorbis_floor;
89
90 typedef struct vorbis_residue {
91 uint16_t type;
92 uint32_t begin;
93 uint32_t end;
94 unsigned partition_size;
95 uint8_t classifications;
96 uint8_t classbook;
97 int16_t books[64][8];
98 uint8_t maxpass;
99 uint16_t ptns_to_read;
100 uint8_t *classifs;
101 } vorbis_residue;
102
103 typedef struct vorbis_mapping {
104 uint8_t submaps;
105 uint16_t coupling_steps;
106 uint8_t *magnitude;
107 uint8_t *angle;
108 uint8_t *mux;
109 uint8_t submap_floor[16];
110 uint8_t submap_residue[16];
111 } vorbis_mapping;
112
113 typedef struct vorbis_mode {
114 uint8_t blockflag;
115 uint16_t windowtype;
116 uint16_t transformtype;
117 uint8_t mapping;
118 } vorbis_mode;
119
120 typedef struct vorbis_context_s {
121 AVCodecContext *avctx;
122 GetBitContext gb;
123 VorbisDSPContext dsp;
124 AVFloatDSPContext fdsp;
125
126 FFTContext mdct[2];
127 uint8_t first_frame;
128 uint32_t version;
129 uint8_t audio_channels;
130 uint32_t audio_samplerate;
131 uint32_t bitrate_maximum;
132 uint32_t bitrate_nominal;
133 uint32_t bitrate_minimum;
134 uint32_t blocksize[2];
135 const float *win[2];
136 uint16_t codebook_count;
137 vorbis_codebook *codebooks;
138 uint8_t floor_count;
139 vorbis_floor *floors;
140 uint8_t residue_count;
141 vorbis_residue *residues;
142 uint8_t mapping_count;
143 vorbis_mapping *mappings;
144 uint8_t mode_count;
145 vorbis_mode *modes;
146 uint8_t mode_number; // mode number for the current packet
147 uint8_t previous_window;
148 float *channel_residues;
149 float *saved;
150 } vorbis_context;
151
152 /* Helper functions */
153
154 #define BARK(x) \
155 (13.1f * atan(0.00074f * (x)) + 2.24f * atan(1.85e-8f * (x) * (x)) + 1e-4f * (x))
156
157 static const char idx_err_str[] = "Index value %d out of range (0 - %d) for %s at %s:%i\n";
158 #define VALIDATE_INDEX(idx, limit) \
159 if (idx >= limit) {\
160 av_log(vc->avctx, AV_LOG_ERROR,\
161 idx_err_str,\
162 (int)(idx), (int)(limit - 1), #idx, __FILE__, __LINE__);\
163 return AVERROR_INVALIDDATA;\
164 }
165 #define GET_VALIDATED_INDEX(idx, bits, limit) \
166 {\
167 idx = get_bits(gb, bits);\
168 VALIDATE_INDEX(idx, limit)\
169 }
170
171 static float vorbisfloat2float(unsigned val)
172 {
173 double mant = val & 0x1fffff;
174 long exp = (val & 0x7fe00000L) >> 21;
175 if (val & 0x80000000)
176 mant = -mant;
177 return ldexp(mant, exp - 20 - 768);
178 }
179
180
181 // Free all allocated memory -----------------------------------------
182
183 static void vorbis_free(vorbis_context *vc)
184 {
185 int i;
186
187 av_freep(&vc->channel_residues);
188 av_freep(&vc->saved);
189
190 for (i = 0; i < vc->residue_count; i++)
191 av_free(vc->residues[i].classifs);
192 av_freep(&vc->residues);
193 av_freep(&vc->modes);
194
195 ff_mdct_end(&vc->mdct[0]);
196 ff_mdct_end(&vc->mdct[1]);
197
198 for (i = 0; i < vc->codebook_count; ++i) {
199 av_free(vc->codebooks[i].codevectors);
200 ff_free_vlc(&vc->codebooks[i].vlc);
201 }
202 av_freep(&vc->codebooks);
203
204 for (i = 0; i < vc->floor_count; ++i) {
205 if (vc->floors[i].floor_type == 0) {
206 av_free(vc->floors[i].data.t0.map[0]);
207 av_free(vc->floors[i].data.t0.map[1]);
208 av_free(vc->floors[i].data.t0.book_list);
209 av_free(vc->floors[i].data.t0.lsp);
210 } else {
211 av_free(vc->floors[i].data.t1.list);
212 }
213 }
214 av_freep(&vc->floors);
215
216 for (i = 0; i < vc->mapping_count; ++i) {
217 av_free(vc->mappings[i].magnitude);
218 av_free(vc->mappings[i].angle);
219 av_free(vc->mappings[i].mux);
220 }
221 av_freep(&vc->mappings);
222 }
223
224 // Parse setup header -------------------------------------------------
225
226 // Process codebooks part
227
228 static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc)
229 {
230 unsigned cb;
231 uint8_t *tmp_vlc_bits = NULL;
232 uint32_t *tmp_vlc_codes = NULL;
233 GetBitContext *gb = &vc->gb;
234 uint16_t *codebook_multiplicands = NULL;
235 int ret = 0;
236
237 vc->codebook_count = get_bits(gb, 8) + 1;
238
239 ff_dlog(NULL, " Codebooks: %d \n", vc->codebook_count);
240
241 vc->codebooks = av_mallocz(vc->codebook_count * sizeof(*vc->codebooks));
242 tmp_vlc_bits = av_mallocz(V_MAX_VLCS * sizeof(*tmp_vlc_bits));
243 tmp_vlc_codes = av_mallocz(V_MAX_VLCS * sizeof(*tmp_vlc_codes));
244 codebook_multiplicands = av_malloc(V_MAX_VLCS * sizeof(*codebook_multiplicands));
245 if (!vc->codebooks ||
246 !tmp_vlc_bits || !tmp_vlc_codes || !codebook_multiplicands) {
247 ret = AVERROR(ENOMEM);
248 goto error;
249 }
250
251 for (cb = 0; cb < vc->codebook_count; ++cb) {
252 vorbis_codebook *codebook_setup = &vc->codebooks[cb];
253 unsigned ordered, t, entries, used_entries = 0;
254
255 ff_dlog(NULL, " %u. Codebook\n", cb);
256
257 if (get_bits(gb, 24) != 0x564342) {
258 av_log(vc->avctx, AV_LOG_ERROR,
259 " %u. Codebook setup data corrupt.\n", cb);
260 ret = AVERROR_INVALIDDATA;
261 goto error;
262 }
263
264 codebook_setup->dimensions=get_bits(gb, 16);
265 if (codebook_setup->dimensions > 16 || codebook_setup->dimensions == 0) {
266 av_log(vc->avctx, AV_LOG_ERROR,
267 " %u. Codebook's dimension is invalid (%d).\n",
268 cb, codebook_setup->dimensions);
269 ret = AVERROR_INVALIDDATA;
270 goto error;
271 }
272 entries = get_bits(gb, 24);
273 if (entries > V_MAX_VLCS) {
274 av_log(vc->avctx, AV_LOG_ERROR,
275 " %u. Codebook has too many entries (%u).\n",
276 cb, entries);
277 ret = AVERROR_INVALIDDATA;
278 goto error;
279 }
280
281 ordered = get_bits1(gb);
282
283 ff_dlog(NULL, " codebook_dimensions %d, codebook_entries %u\n",
284 codebook_setup->dimensions, entries);
285
286 if (!ordered) {
287 unsigned ce, flag;
288 unsigned sparse = get_bits1(gb);
289
290 ff_dlog(NULL, " not ordered \n");
291
292 if (sparse) {
293 ff_dlog(NULL, " sparse \n");
294
295 used_entries = 0;
296 for (ce = 0; ce < entries; ++ce) {
297 flag = get_bits1(gb);
298 if (flag) {
299 tmp_vlc_bits[ce] = get_bits(gb, 5) + 1;
300 ++used_entries;
301 } else
302 tmp_vlc_bits[ce] = 0;
303 }
304 } else {
305 ff_dlog(NULL, " not sparse \n");
306
307 used_entries = entries;
308 for (ce = 0; ce < entries; ++ce)
309 tmp_vlc_bits[ce] = get_bits(gb, 5) + 1;
310 }
311 } else {
312 unsigned current_entry = 0;
313 unsigned current_length = get_bits(gb, 5) + 1;
314
315 ff_dlog(NULL, " ordered, current length: %u\n", current_length); //FIXME
316
317 used_entries = entries;
318 for (; current_entry < used_entries && current_length <= 32; ++current_length) {
319 unsigned i, number;
320
321 ff_dlog(NULL, " number bits: %u ", ilog(entries - current_entry));
322
323 number = get_bits(gb, ilog(entries - current_entry));
324
325 ff_dlog(NULL, " number: %u\n", number);
326
327 for (i = current_entry; i < number+current_entry; ++i)
328 if (i < used_entries)
329 tmp_vlc_bits[i] = current_length;
330
331 current_entry+=number;
332 }
333 if (current_entry>used_entries) {
334 av_log(vc->avctx, AV_LOG_ERROR, " More codelengths than codes in codebook. \n");
335 ret = AVERROR_INVALIDDATA;
336 goto error;
337 }
338 }
339
340 codebook_setup->lookup_type = get_bits(gb, 4);
341
342 ff_dlog(NULL, " lookup type: %d : %s \n", codebook_setup->lookup_type,
343 codebook_setup->lookup_type ? "vq" : "no lookup");
344
345 // If the codebook is used for (inverse) VQ, calculate codevectors.
346
347 if (codebook_setup->lookup_type == 1) {
348 unsigned i, j, k;
349 unsigned codebook_lookup_values = ff_vorbis_nth_root(entries, codebook_setup->dimensions);
350
351 float codebook_minimum_value = vorbisfloat2float(get_bits_long(gb, 32));
352 float codebook_delta_value = vorbisfloat2float(get_bits_long(gb, 32));
353 unsigned codebook_value_bits = get_bits(gb, 4) + 1;
354 unsigned codebook_sequence_p = get_bits1(gb);
355
356 ff_dlog(NULL, " We expect %d numbers for building the codevectors. \n",
357 codebook_lookup_values);
358 ff_dlog(NULL, " delta %f minmum %f \n",
359 codebook_delta_value, codebook_minimum_value);
360
361 for (i = 0; i < codebook_lookup_values; ++i) {
362 codebook_multiplicands[i] = get_bits(gb, codebook_value_bits);
363
364 ff_dlog(NULL, " multiplicands*delta+minmum : %e \n",
365 (float)codebook_multiplicands[i] * codebook_delta_value + codebook_minimum_value);
366 ff_dlog(NULL, " multiplicand %u\n", codebook_multiplicands[i]);
367 }
368
369 // Weed out unused vlcs and build codevector vector
370 if (used_entries) {
371 codebook_setup->codevectors =
372 av_mallocz(used_entries * codebook_setup->dimensions *
373 sizeof(*codebook_setup->codevectors));
374 if (!codebook_setup->codevectors)
375 return AVERROR(ENOMEM);
376 } else
377 codebook_setup->codevectors = NULL;
378
379 for (j = 0, i = 0; i < entries; ++i) {
380 unsigned dim = codebook_setup->dimensions;
381
382 if (tmp_vlc_bits[i]) {
383 float last = 0.0;
384 unsigned lookup_offset = i;
385
386 ff_dlog(vc->avctx, "Lookup offset %u ,", i);
387
388 for (k = 0; k < dim; ++k) {
389 unsigned multiplicand_offset = lookup_offset % codebook_lookup_values;
390 codebook_setup->codevectors[j * dim + k] = codebook_multiplicands[multiplicand_offset] * codebook_delta_value + codebook_minimum_value + last;
391 if (codebook_sequence_p)
392 last = codebook_setup->codevectors[j * dim + k];
393 lookup_offset/=codebook_lookup_values;
394 }
395 tmp_vlc_bits[j] = tmp_vlc_bits[i];
396
397 ff_dlog(vc->avctx, "real lookup offset %u, vector: ", j);
398 for (k = 0; k < dim; ++k)
399 ff_dlog(vc->avctx, " %f ",
400 codebook_setup->codevectors[j * dim + k]);
401 ff_dlog(vc->avctx, "\n");
402
403 ++j;
404 }
405 }
406 if (j != used_entries) {
407 av_log(vc->avctx, AV_LOG_ERROR, "Bug in codevector vector building code. \n");
408 ret = AVERROR_INVALIDDATA;
409 goto error;
410 }
411 entries = used_entries;
412 } else if (codebook_setup->lookup_type >= 2) {
413 av_log(vc->avctx, AV_LOG_ERROR, "Codebook lookup type not supported. \n");
414 ret = AVERROR_INVALIDDATA;
415 goto error;
416 }
417
418 // Initialize VLC table
419 if (ff_vorbis_len2vlc(tmp_vlc_bits, tmp_vlc_codes, entries)) {
420 av_log(vc->avctx, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");
421 ret = AVERROR_INVALIDDATA;
422 goto error;
423 }
424 codebook_setup->maxdepth = 0;
425 for (t = 0; t < entries; ++t)
426 if (tmp_vlc_bits[t] >= codebook_setup->maxdepth)
427 codebook_setup->maxdepth = tmp_vlc_bits[t];
428
429 if (codebook_setup->maxdepth > 3 * V_NB_BITS)
430 codebook_setup->nb_bits = V_NB_BITS2;
431 else
432 codebook_setup->nb_bits = V_NB_BITS;
433
434 codebook_setup->maxdepth = (codebook_setup->maxdepth+codebook_setup->nb_bits - 1) / codebook_setup->nb_bits;
435
436 if ((ret = init_vlc(&codebook_setup->vlc, codebook_setup->nb_bits,
437 entries, tmp_vlc_bits, sizeof(*tmp_vlc_bits),
438 sizeof(*tmp_vlc_bits), tmp_vlc_codes,
439 sizeof(*tmp_vlc_codes), sizeof(*tmp_vlc_codes),
440 INIT_VLC_LE))) {
441 av_log(vc->avctx, AV_LOG_ERROR, " Error generating vlc tables. \n");
442 goto error;
443 }
444 }
445
446 av_free(tmp_vlc_bits);
447 av_free(tmp_vlc_codes);
448 av_free(codebook_multiplicands);
449 return 0;
450
451 // Error:
452 error:
453 av_free(tmp_vlc_bits);
454 av_free(tmp_vlc_codes);
455 av_free(codebook_multiplicands);
456 return ret;
457 }
458
459 // Process time domain transforms part (unused in Vorbis I)
460
461 static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc)
462 {
463 GetBitContext *gb = &vc->gb;
464 unsigned i, vorbis_time_count = get_bits(gb, 6) + 1;
465
466 for (i = 0; i < vorbis_time_count; ++i) {
467 unsigned vorbis_tdtransform = get_bits(gb, 16);
468
469 ff_dlog(NULL, " Vorbis time domain transform %u: %u\n",
470 vorbis_time_count, vorbis_tdtransform);
471
472 if (vorbis_tdtransform) {
473 av_log(vc->avctx, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n");
474 return AVERROR_INVALIDDATA;
475 }
476 }
477 return 0;
478 }
479
480 // Process floors part
481
482 static int vorbis_floor0_decode(vorbis_context *vc,
483 vorbis_floor_data *vfu, float *vec);
484 static int create_map(vorbis_context *vc, unsigned floor_number);
485 static int vorbis_floor1_decode(vorbis_context *vc,
486 vorbis_floor_data *vfu, float *vec);
487 static int vorbis_parse_setup_hdr_floors(vorbis_context *vc)
488 {
489 GetBitContext *gb = &vc->gb;
490 int i, j, k, ret;
491
492 vc->floor_count = get_bits(gb, 6) + 1;
493
494 vc->floors = av_mallocz(vc->floor_count * sizeof(*vc->floors));
495 if (!vc->floors)
496 return AVERROR(ENOMEM);
497
498 for (i = 0; i < vc->floor_count; ++i) {
499 vorbis_floor *floor_setup = &vc->floors[i];
500
501 floor_setup->floor_type = get_bits(gb, 16);
502
503 ff_dlog(NULL, " %d. floor type %d \n", i, floor_setup->floor_type);
504
505 if (floor_setup->floor_type == 1) {
506 int maximum_class = -1;
507 unsigned rangebits, rangemax, floor1_values = 2;
508
509 floor_setup->decode = vorbis_floor1_decode;
510
511 floor_setup->data.t1.partitions = get_bits(gb, 5);
512
513 ff_dlog(NULL, " %d.floor: %d partitions \n",
514 i, floor_setup->data.t1.partitions);
515
516 for (j = 0; j < floor_setup->data.t1.partitions; ++j) {
517 floor_setup->data.t1.partition_class[j] = get_bits(gb, 4);
518 if (floor_setup->data.t1.partition_class[j] > maximum_class)
519 maximum_class = floor_setup->data.t1.partition_class[j];
520
521 ff_dlog(NULL, " %d. floor %d partition class %d \n",
522 i, j, floor_setup->data.t1.partition_class[j]);
523
524 }
525
526 ff_dlog(NULL, " maximum class %d \n", maximum_class);
527
528 for (j = 0; j <= maximum_class; ++j) {
529 floor_setup->data.t1.class_dimensions[j] = get_bits(gb, 3) + 1;
530 floor_setup->data.t1.class_subclasses[j] = get_bits(gb, 2);
531
532 ff_dlog(NULL, " %d floor %d class dim: %d subclasses %d \n", i, j,
533 floor_setup->data.t1.class_dimensions[j],
534 floor_setup->data.t1.class_subclasses[j]);
535
536 if (floor_setup->data.t1.class_subclasses[j]) {
537 GET_VALIDATED_INDEX(floor_setup->data.t1.class_masterbook[j], 8, vc->codebook_count)
538
539 ff_dlog(NULL, " masterbook: %d \n", floor_setup->data.t1.class_masterbook[j]);
540 }
541
542 for (k = 0; k < (1 << floor_setup->data.t1.class_subclasses[j]); ++k) {
543 int16_t bits = get_bits(gb, 8) - 1;
544 if (bits != -1)
545 VALIDATE_INDEX(bits, vc->codebook_count)
546 floor_setup->data.t1.subclass_books[j][k] = bits;
547
548 ff_dlog(NULL, " book %d. : %d \n", k, floor_setup->data.t1.subclass_books[j][k]);
549 }
550 }
551
552 floor_setup->data.t1.multiplier = get_bits(gb, 2) + 1;
553 floor_setup->data.t1.x_list_dim = 2;
554
555 for (j = 0; j < floor_setup->data.t1.partitions; ++j)
556 floor_setup->data.t1.x_list_dim+=floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];
557
558 floor_setup->data.t1.list = av_mallocz(floor_setup->data.t1.x_list_dim *
559 sizeof(*floor_setup->data.t1.list));
560 if (!floor_setup->data.t1.list)
561 return AVERROR(ENOMEM);
562
563 rangebits = get_bits(gb, 4);
564 rangemax = (1 << rangebits);
565 if (rangemax > vc->blocksize[1] / 2) {
566 av_log(vc->avctx, AV_LOG_ERROR,
567 "Floor value is too large for blocksize: %u (%"PRIu32")\n",
568 rangemax, vc->blocksize[1] / 2);
569 return AVERROR_INVALIDDATA;
570 }
571 floor_setup->data.t1.list[0].x = 0;
572 floor_setup->data.t1.list[1].x = rangemax;
573
574 for (j = 0; j < floor_setup->data.t1.partitions; ++j) {
575 for (k = 0; k < floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]]; ++k, ++floor1_values) {
576 floor_setup->data.t1.list[floor1_values].x = get_bits(gb, rangebits);
577
578 ff_dlog(NULL, " %u. floor1 Y coord. %d\n", floor1_values,
579 floor_setup->data.t1.list[floor1_values].x);
580 }
581 }
582
583 // Precalculate order of x coordinates - needed for decode
584 if (ff_vorbis_ready_floor1_list(vc->avctx,
585 floor_setup->data.t1.list,
586 floor_setup->data.t1.x_list_dim)) {
587 return AVERROR_INVALIDDATA;
588 }
589 } else if (floor_setup->floor_type == 0) {
590 unsigned max_codebook_dim = 0;
591
592 floor_setup->decode = vorbis_floor0_decode;
593
594 floor_setup->data.t0.order = get_bits(gb, 8);
595 if (!floor_setup->data.t0.order) {
596 av_log(vc->avctx, AV_LOG_ERROR, "Floor 0 order is 0.\n");
597 return AVERROR_INVALIDDATA;
598 }
599 floor_setup->data.t0.rate = get_bits(gb, 16);
600 if (!floor_setup->data.t0.rate) {
601 av_log(vc->avctx, AV_LOG_ERROR, "Floor 0 rate is 0.\n");
602 return AVERROR_INVALIDDATA;
603 }
604 floor_setup->data.t0.bark_map_size = get_bits(gb, 16);
605 if (!floor_setup->data.t0.bark_map_size) {
606 av_log(vc->avctx, AV_LOG_ERROR,
607 "Floor 0 bark map size is 0.\n");
608 return AVERROR_INVALIDDATA;
609 }
610 floor_setup->data.t0.amplitude_bits = get_bits(gb, 6);
611 floor_setup->data.t0.amplitude_offset = get_bits(gb, 8);
612 floor_setup->data.t0.num_books = get_bits(gb, 4) + 1;
613
614 /* allocate mem for booklist */
615 floor_setup->data.t0.book_list =
616 av_malloc(floor_setup->data.t0.num_books);
617 if (!floor_setup->data.t0.book_list)
618 return AVERROR(ENOMEM);
619 /* read book indexes */
620 {
621 int idx;
622 unsigned book_idx;
623 for (idx = 0; idx < floor_setup->data.t0.num_books; ++idx) {
624 GET_VALIDATED_INDEX(book_idx, 8, vc->codebook_count)
625 floor_setup->data.t0.book_list[idx] = book_idx;
626 if (vc->codebooks[book_idx].dimensions > max_codebook_dim)
627 max_codebook_dim = vc->codebooks[book_idx].dimensions;
628 }
629 }
630
631 if ((ret = create_map(vc, i)) < 0)
632 return ret;
633
634 /* codebook dim is for padding if codebook dim doesn't *
635 * divide order+1 then we need to read more data */
636 floor_setup->data.t0.lsp =
637 av_malloc((floor_setup->data.t0.order + 1 + max_codebook_dim)
638 * sizeof(*floor_setup->data.t0.lsp));
639 if (!floor_setup->data.t0.lsp)
640 return AVERROR(ENOMEM);
641
642 /* debug output parsed headers */
643 ff_dlog(NULL, "floor0 order: %u\n", floor_setup->data.t0.order);
644 ff_dlog(NULL, "floor0 rate: %u\n", floor_setup->data.t0.rate);
645 ff_dlog(NULL, "floor0 bark map size: %u\n",
646 floor_setup->data.t0.bark_map_size);
647 ff_dlog(NULL, "floor0 amplitude bits: %u\n",
648 floor_setup->data.t0.amplitude_bits);
649 ff_dlog(NULL, "floor0 amplitude offset: %u\n",
650 floor_setup->data.t0.amplitude_offset);
651 ff_dlog(NULL, "floor0 number of books: %u\n",
652 floor_setup->data.t0.num_books);
653 ff_dlog(NULL, "floor0 book list pointer: %p\n",
654 floor_setup->data.t0.book_list);
655 {
656 int idx;
657 for (idx = 0; idx < floor_setup->data.t0.num_books; ++idx) {
658 ff_dlog(NULL, " Book %d: %u\n", idx + 1,
659 floor_setup->data.t0.book_list[idx]);
660 }
661 }
662 } else {
663 av_log(vc->avctx, AV_LOG_ERROR, "Invalid floor type!\n");
664 return AVERROR_INVALIDDATA;
665 }
666 }
667 return 0;
668 }
669
670 // Process residues part
671
672 static int vorbis_parse_setup_hdr_residues(vorbis_context *vc)
673 {
674 GetBitContext *gb = &vc->gb;
675 unsigned i, j, k;
676
677 vc->residue_count = get_bits(gb, 6)+1;
678 vc->residues = av_mallocz(vc->residue_count * sizeof(*vc->residues));
679 if (!vc->residues)
680 return AVERROR(ENOMEM);
681
682 ff_dlog(NULL, " There are %d residues. \n", vc->residue_count);
683
684 for (i = 0; i < vc->residue_count; ++i) {
685 vorbis_residue *res_setup = &vc->residues[i];
686 uint8_t cascade[64];
687 unsigned high_bits, low_bits;
688
689 res_setup->type = get_bits(gb, 16);
690
691 ff_dlog(NULL, " %u. residue type %d\n", i, res_setup->type);
692
693 res_setup->begin = get_bits(gb, 24);
694 res_setup->end = get_bits(gb, 24);
695 res_setup->partition_size = get_bits(gb, 24) + 1;
696 /* Validations to prevent a buffer overflow later. */
697 if (res_setup->begin>res_setup->end ||
698 res_setup->end > (res_setup->type == 2 ? vc->avctx->channels : 1) * vc->blocksize[1] / 2 ||
699 (res_setup->end-res_setup->begin) / res_setup->partition_size > V_MAX_PARTITIONS) {
700 av_log(vc->avctx, AV_LOG_ERROR,
701 "partition out of bounds: type, begin, end, size, blocksize: %"PRIu16", %"PRIu32", %"PRIu32", %u, %"PRIu32"\n",
702 res_setup->type, res_setup->begin, res_setup->end,
703 res_setup->partition_size, vc->blocksize[1] / 2);
704 return AVERROR_INVALIDDATA;
705 }
706
707 res_setup->classifications = get_bits(gb, 6) + 1;
708 GET_VALIDATED_INDEX(res_setup->classbook, 8, vc->codebook_count)
709
710 res_setup->ptns_to_read =
711 (res_setup->end - res_setup->begin) / res_setup->partition_size;
712 res_setup->classifs = av_malloc(res_setup->ptns_to_read *
713 vc->audio_channels *
714 sizeof(*res_setup->classifs));
715 if (!res_setup->classifs)
716 return AVERROR(ENOMEM);
717
718 ff_dlog(NULL, " begin %"PRIu32" end %"PRIu32" part.size %u classif.s %"PRIu8" classbook %"PRIu8"\n",
719 res_setup->begin, res_setup->end, res_setup->partition_size,
720 res_setup->classifications, res_setup->classbook);
721
722 for (j = 0; j < res_setup->classifications; ++j) {
723 high_bits = 0;
724 low_bits = get_bits(gb, 3);
725 if (get_bits1(gb))
726 high_bits = get_bits(gb, 5);
727 cascade[j] = (high_bits << 3) + low_bits;
728
729 ff_dlog(NULL, " %u class cascade depth: %d\n", j, ilog(cascade[j]));
730 }
731
732 res_setup->maxpass = 0;
733 for (j = 0; j < res_setup->classifications; ++j) {
734 for (k = 0; k < 8; ++k) {
735 if (cascade[j]&(1 << k)) {
736 GET_VALIDATED_INDEX(res_setup->books[j][k], 8, vc->codebook_count)
737
738 ff_dlog(NULL, " %u class cascade depth %u book: %d\n",
739 j, k, res_setup->books[j][k]);
740
741 if (k>res_setup->maxpass)
742 res_setup->maxpass = k;
743 } else {
744 res_setup->books[j][k] = -1;
745 }
746 }
747 }
748 }
749 return 0;
750 }
751
752 // Process mappings part
753
754 static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc)
755 {
756 GetBitContext *gb = &vc->gb;
757 unsigned i, j;
758
759 vc->mapping_count = get_bits(gb, 6)+1;
760 vc->mappings = av_mallocz(vc->mapping_count * sizeof(*vc->mappings));
761 if (!vc->mappings)
762 return AVERROR(ENOMEM);
763
764 ff_dlog(NULL, " There are %d mappings. \n", vc->mapping_count);
765
766 for (i = 0; i < vc->mapping_count; ++i) {
767 vorbis_mapping *mapping_setup = &vc->mappings[i];
768
769 if (get_bits(gb, 16)) {
770 av_log(vc->avctx, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n");
771 return AVERROR_INVALIDDATA;
772 }
773 if (get_bits1(gb)) {
774 mapping_setup->submaps = get_bits(gb, 4) + 1;
775 } else {
776 mapping_setup->submaps = 1;
777 }
778
779 if (get_bits1(gb)) {
780 mapping_setup->coupling_steps = get_bits(gb, 8) + 1;
781 mapping_setup->magnitude = av_mallocz(mapping_setup->coupling_steps *
782 sizeof(*mapping_setup->magnitude));
783 mapping_setup->angle = av_mallocz(mapping_setup->coupling_steps *
784 sizeof(*mapping_setup->angle));
785 if (!mapping_setup->angle || !mapping_setup->magnitude)
786 return AVERROR(ENOMEM);
787
788 for (j = 0; j < mapping_setup->coupling_steps; ++j) {
789 GET_VALIDATED_INDEX(mapping_setup->magnitude[j], ilog(vc->audio_channels - 1), vc->audio_channels)
790 GET_VALIDATED_INDEX(mapping_setup->angle[j], ilog(vc->audio_channels - 1), vc->audio_channels)
791 }
792 } else {
793 mapping_setup->coupling_steps = 0;
794 }
795
796 ff_dlog(NULL, " %u mapping coupling steps: %d\n",
797 i, mapping_setup->coupling_steps);
798
799 if (get_bits(gb, 2)) {
800 av_log(vc->avctx, AV_LOG_ERROR, "%u. mapping setup data invalid.\n", i);
801 return AVERROR_INVALIDDATA; // following spec.
802 }
803
804 if (mapping_setup->submaps>1) {
805 mapping_setup->mux = av_mallocz(vc->audio_channels *
806 sizeof(*mapping_setup->mux));
807 if (!mapping_setup->mux)
808 return AVERROR(ENOMEM);
809
810 for (j = 0; j < vc->audio_channels; ++j)
811 mapping_setup->mux[j] = get_bits(gb, 4);
812 }
813
814 for (j = 0; j < mapping_setup->submaps; ++j) {
815 skip_bits(gb, 8); // FIXME check?
816 GET_VALIDATED_INDEX(mapping_setup->submap_floor[j], 8, vc->floor_count)
817 GET_VALIDATED_INDEX(mapping_setup->submap_residue[j], 8, vc->residue_count)
818
819 ff_dlog(NULL, " %u mapping %u submap : floor %d, residue %d\n", i, j,
820 mapping_setup->submap_floor[j],
821 mapping_setup->submap_residue[j]);
822 }
823 }
824 return 0;
825 }
826
827 // Process modes part
828
829 static int create_map(vorbis_context *vc, unsigned floor_number)
830 {
831 vorbis_floor *floors = vc->floors;
832 vorbis_floor0 *vf;
833 int idx;
834 int blockflag, n;
835 int32_t *map;
836
837 for (blockflag = 0; blockflag < 2; ++blockflag) {
838 n = vc->blocksize[blockflag] / 2;
839 floors[floor_number].data.t0.map[blockflag] =
840 av_malloc((n + 1) * sizeof(int32_t)); // n + sentinel
841 if (!floors[floor_number].data.t0.map[blockflag])
842 return AVERROR(ENOMEM);
843
844 map = floors[floor_number].data.t0.map[blockflag];
845 vf = &floors[floor_number].data.t0;
846
847 for (idx = 0; idx < n; ++idx) {
848 map[idx] = floor(BARK((vf->rate * idx) / (2.0f * n)) *
849 (vf->bark_map_size / BARK(vf->rate / 2.0f)));
850 if (vf->bark_map_size-1 < map[idx])
851 map[idx] = vf->bark_map_size - 1;
852 }
853 map[n] = -1;
854 vf->map_size[blockflag] = n;
855 }
856
857 for (idx = 0; idx <= n; ++idx) {
858 ff_dlog(NULL, "floor0 map: map at pos %d is %"PRId32"\n", idx, map[idx]);
859 }
860
861 return 0;
862 }
863
864 static int vorbis_parse_setup_hdr_modes(vorbis_context *vc)
865 {
866 GetBitContext *gb = &vc->gb;
867 unsigned i;
868
869 vc->mode_count = get_bits(gb, 6) + 1;
870 vc->modes = av_mallocz(vc->mode_count * sizeof(*vc->modes));
871 if (!vc->modes)
872 return AVERROR(ENOMEM);
873
874 ff_dlog(NULL, " There are %d modes.\n", vc->mode_count);
875
876 for (i = 0; i < vc->mode_count; ++i) {
877 vorbis_mode *mode_setup = &vc->modes[i];
878
879 mode_setup->blockflag = get_bits1(gb);
880 mode_setup->windowtype = get_bits(gb, 16); //FIXME check
881 mode_setup->transformtype = get_bits(gb, 16); //FIXME check
882 GET_VALIDATED_INDEX(mode_setup->mapping, 8, vc->mapping_count);
883
884 ff_dlog(NULL, " %u mode: blockflag %d, windowtype %d, transformtype %d, mapping %d\n",
885 i, mode_setup->blockflag, mode_setup->windowtype,
886 mode_setup->transformtype, mode_setup->mapping);
887 }
888 return 0;
889 }
890
891 // Process the whole setup header using the functions above
892
893 static int vorbis_parse_setup_hdr(vorbis_context *vc)
894 {
895 GetBitContext *gb = &vc->gb;
896 int ret;
897
898 if ((get_bits(gb, 8) != 'v') || (get_bits(gb, 8) != 'o') ||
899 (get_bits(gb, 8) != 'r') || (get_bits(gb, 8) != 'b') ||
900 (get_bits(gb, 8) != 'i') || (get_bits(gb, 8) != 's')) {
901 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n");
902 return AVERROR_INVALIDDATA;
903 }
904
905 if ((ret = vorbis_parse_setup_hdr_codebooks(vc))) {
906 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n");
907 return ret;
908 }
909 if ((ret = vorbis_parse_setup_hdr_tdtransforms(vc))) {
910 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n");
911 return ret;
912 }
913 if ((ret = vorbis_parse_setup_hdr_floors(vc))) {
914 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n");
915 return ret;
916 }
917 if ((ret = vorbis_parse_setup_hdr_residues(vc))) {
918 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n");
919 return ret;
920 }
921 if ((ret = vorbis_parse_setup_hdr_mappings(vc))) {
922 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n");
923 return ret;
924 }
925 if ((ret = vorbis_parse_setup_hdr_modes(vc))) {
926 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n");
927 return ret;
928 }
929 if (!get_bits1(gb)) {
930 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n");
931 return AVERROR_INVALIDDATA; // framing flag bit unset error
932 }
933
934 return 0;
935 }
936
937 // Process the identification header
938
939 static int vorbis_parse_id_hdr(vorbis_context *vc)
940 {
941 GetBitContext *gb = &vc->gb;
942 unsigned bl0, bl1;
943
944 if ((get_bits(gb, 8) != 'v') || (get_bits(gb, 8) != 'o') ||
945 (get_bits(gb, 8) != 'r') || (get_bits(gb, 8) != 'b') ||
946 (get_bits(gb, 8) != 'i') || (get_bits(gb, 8) != 's')) {
947 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n");
948 return AVERROR_INVALIDDATA;
949 }
950
951 vc->version = get_bits_long(gb, 32); //FIXME check 0
952 vc->audio_channels = get_bits(gb, 8);
953 if (vc->audio_channels <= 0) {
954 av_log(vc->avctx, AV_LOG_ERROR, "Invalid number of channels\n");
955 return AVERROR_INVALIDDATA;
956 }
957 vc->audio_samplerate = get_bits_long(gb, 32);
958 if (vc->audio_samplerate <= 0) {
959 av_log(vc->avctx, AV_LOG_ERROR, "Invalid samplerate\n");
960 return AVERROR_INVALIDDATA;
961 }
962 vc->bitrate_maximum = get_bits_long(gb, 32);
963 vc->bitrate_nominal = get_bits_long(gb, 32);
964 vc->bitrate_minimum = get_bits_long(gb, 32);
965 bl0 = get_bits(gb, 4);
966 bl1 = get_bits(gb, 4);
967 vc->blocksize[0] = (1 << bl0);
968 vc->blocksize[1] = (1 << bl1);
969 if (bl0 > 13 || bl0 < 6 || bl1 > 13 || bl1 < 6 || bl1 < bl0) {
970 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n");
971 return AVERROR_INVALIDDATA;
972 }
973 vc->win[0] = ff_vorbis_vwin[bl0 - 6];
974 vc->win[1] = ff_vorbis_vwin[bl1 - 6];
975
976 if ((get_bits1(gb)) == 0) {
977 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n");
978 return AVERROR_INVALIDDATA;
979 }
980
981 vc->channel_residues = av_malloc((vc->blocksize[1] / 2) * vc->audio_channels * sizeof(*vc->channel_residues));
982 vc->saved = av_mallocz((vc->blocksize[1] / 4) * vc->audio_channels * sizeof(*vc->saved));
983 if (!vc->channel_residues || !vc->saved)
984 return AVERROR(ENOMEM);
985
986 vc->previous_window = 0;
987
988 ff_mdct_init(&vc->mdct[0], bl0, 1, -1.0);
989 ff_mdct_init(&vc->mdct[1], bl1, 1, -1.0);
990
991 ff_dlog(NULL, " vorbis version %"PRIu32" \n audio_channels %"PRIu8" \n audio_samplerate %"PRIu32" \n bitrate_max %"PRIu32" \n bitrate_nom %"PRIu32" \n bitrate_min %"PRIu32" \n blk_0 %"PRIu32" blk_1 %"PRIu32" \n ",
992 vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize[0], vc->blocksize[1]);
993
994 /*
995 BLK = vc->blocksize[0];
996 for (i = 0; i < BLK / 2; ++i) {
997 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)));
998 }
999 */
1000
1001 return 0;
1002 }
1003
1004 // Process the extradata using the functions above (identification header, setup header)
1005
1006 static av_cold int vorbis_decode_init(AVCodecContext *avctx)
1007 {
1008 vorbis_context *vc = avctx->priv_data;
1009 uint8_t *headers = avctx->extradata;
1010 int headers_len = avctx->extradata_size;
1011 uint8_t *header_start[3];
1012 int header_len[3];
1013 GetBitContext *gb = &vc->gb;
1014 int hdr_type, ret;
1015
1016 vc->avctx = avctx;
1017 ff_vorbisdsp_init(&vc->dsp);
1018 avpriv_float_dsp_init(&vc->fdsp, avctx->flags & AV_CODEC_FLAG_BITEXACT);
1019
1020 avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
1021
1022 if (!headers_len) {
1023 av_log(avctx, AV_LOG_ERROR, "Extradata missing.\n");
1024 return AVERROR_INVALIDDATA;
1025 }
1026
1027 if ((ret = avpriv_split_xiph_headers(headers, headers_len, 30, header_start, header_len)) < 0) {
1028 av_log(avctx, AV_LOG_ERROR, "Extradata corrupt.\n");
1029 return ret;
1030 }
1031
1032 init_get_bits(gb, header_start[0], header_len[0]*8);
1033 hdr_type = get_bits(gb, 8);
1034 if (hdr_type != 1) {
1035 av_log(avctx, AV_LOG_ERROR, "First header is not the id header.\n");
1036 return AVERROR_INVALIDDATA;
1037 }
1038 if ((ret = vorbis_parse_id_hdr(vc))) {
1039 av_log(avctx, AV_LOG_ERROR, "Id header corrupt.\n");
1040 vorbis_free(vc);
1041 return ret;
1042 }
1043
1044 init_get_bits(gb, header_start[2], header_len[2]*8);
1045 hdr_type = get_bits(gb, 8);
1046 if (hdr_type != 5) {
1047 av_log(avctx, AV_LOG_ERROR, "Third header is not the setup header.\n");
1048 vorbis_free(vc);
1049 return AVERROR_INVALIDDATA;
1050 }
1051 if ((ret = vorbis_parse_setup_hdr(vc))) {
1052 av_log(avctx, AV_LOG_ERROR, "Setup header corrupt.\n");
1053 vorbis_free(vc);
1054 return ret;
1055 }
1056
1057 if (vc->audio_channels > 8)
1058 avctx->channel_layout = 0;
1059 else
1060 avctx->channel_layout = ff_vorbis_channel_layouts[vc->audio_channels - 1];
1061
1062 avctx->channels = vc->audio_channels;
1063 avctx->sample_rate = vc->audio_samplerate;
1064
1065 return 0;
1066 }
1067
1068 // Decode audiopackets -------------------------------------------------
1069
1070 // Read and decode floor
1071
1072 static int vorbis_floor0_decode(vorbis_context *vc,
1073 vorbis_floor_data *vfu, float *vec)
1074 {
1075 vorbis_floor0 *vf = &vfu->t0;
1076 float *lsp = vf->lsp;
1077 unsigned amplitude, book_idx;
1078 unsigned blockflag = vc->modes[vc->mode_number].blockflag;
1079
1080 if (!vf->amplitude_bits)
1081 return 1;
1082
1083 amplitude = get_bits(&vc->gb, vf->amplitude_bits);
1084 if (amplitude > 0) {
1085 float last = 0;
1086 unsigned idx, lsp_len = 0;
1087 vorbis_codebook codebook;
1088
1089 book_idx = get_bits(&vc->gb, ilog(vf->num_books));
1090 if (book_idx >= vf->num_books) {
1091 av_log(vc->avctx, AV_LOG_ERROR, "floor0 dec: booknumber too high!\n");
1092 book_idx = 0;
1093 }
1094 ff_dlog(NULL, "floor0 dec: booknumber: %u\n", book_idx);
1095 codebook = vc->codebooks[vf->book_list[book_idx]];
1096 /* Invalid codebook! */
1097 if (!codebook.codevectors)
1098 return AVERROR_INVALIDDATA;
1099
1100 while (lsp_len<vf->order) {
1101 int vec_off;
1102
1103 ff_dlog(NULL, "floor0 dec: book dimension: %d\n", codebook.dimensions);
1104 ff_dlog(NULL, "floor0 dec: maximum depth: %d\n", codebook.maxdepth);
1105 /* read temp vector */
1106 vec_off = get_vlc2(&vc->gb, codebook.vlc.table,
1107 codebook.nb_bits, codebook.maxdepth)
1108 * codebook.dimensions;
1109 ff_dlog(NULL, "floor0 dec: vector offset: %d\n", vec_off);
1110 /* copy each vector component and add last to it */
1111 for (idx = 0; idx < codebook.dimensions; ++idx)
1112 lsp[lsp_len+idx] = codebook.codevectors[vec_off+idx] + last;
1113 last = lsp[lsp_len+idx-1]; /* set last to last vector component */
1114
1115 lsp_len += codebook.dimensions;
1116 }
1117 /* DEBUG: output lsp coeffs */
1118 {
1119 int idx;
1120 for (idx = 0; idx < lsp_len; ++idx)
1121 ff_dlog(NULL, "floor0 dec: coeff at %d is %f\n", idx, lsp[idx]);
1122 }
1123
1124 /* synthesize floor output vector */
1125 {
1126 int i;
1127 int order = vf->order;
1128 float wstep = M_PI / vf->bark_map_size;
1129
1130 for (i = 0; i < order; i++)
1131 lsp[i] = 2.0f * cos(lsp[i]);
1132
1133 ff_dlog(NULL, "floor0 synth: map_size = %"PRIu32"; m = %d; wstep = %f\n",
1134 vf->map_size[blockflag], order, wstep);
1135
1136 i = 0;
1137 while (i < vf->map_size[blockflag]) {
1138 int j, iter_cond = vf->map[blockflag][i];
1139 float p = 0.5f;
1140 float q = 0.5f;
1141 float two_cos_w = 2.0f * cos(wstep * iter_cond); // needed all times
1142
1143 /* similar part for the q and p products */
1144 for (j = 0; j + 1 < order; j += 2) {
1145 q *= lsp[j] - two_cos_w;
1146 p *= lsp[j + 1] - two_cos_w;
1147 }
1148 if (j == order) { // even order
1149 p *= p * (2.0f - two_cos_w);
1150 q *= q * (2.0f + two_cos_w);
1151 } else { // odd order
1152 q *= two_cos_w-lsp[j]; // one more time for q
1153
1154 /* final step and square */
1155 p *= p * (4.f - two_cos_w * two_cos_w);
1156 q *= q;
1157 }
1158
1159 /* calculate linear floor value */
1160 q = exp((((amplitude*vf->amplitude_offset) /
1161 (((1 << vf->amplitude_bits) - 1) * sqrt(p + q)))
1162 - vf->amplitude_offset) * .11512925f);
1163
1164 /* fill vector */
1165 do {
1166 vec[i] = q; ++i;
1167 } while (vf->map[blockflag][i] == iter_cond);
1168 }
1169 }
1170 } else {
1171 /* this channel is unused */
1172 return 1;
1173 }
1174
1175 ff_dlog(NULL, " Floor0 decoded\n");
1176
1177 return 0;
1178 }
1179
1180 static int vorbis_floor1_decode(vorbis_context *vc,
1181 vorbis_floor_data *vfu, float *vec)
1182 {
1183 vorbis_floor1 *vf = &vfu->t1;
1184 GetBitContext *gb = &vc->gb;
1185 uint16_t range_v[4] = { 256, 128, 86, 64 };
1186 unsigned range = range_v[vf->multiplier - 1];
1187 uint16_t floor1_Y[258];
1188 uint16_t floor1_Y_final[258];
1189 int floor1_flag[258];
1190 unsigned class, cdim, cbits, csub, cval, offset, i, j;
1191 int book, adx, ady, dy, off, predicted, err;
1192
1193
1194 if (!get_bits1(gb)) // silence
1195 return 1;
1196
1197 // Read values (or differences) for the floor's points
1198
1199 floor1_Y[0] = get_bits(gb, ilog(range - 1));
1200 floor1_Y[1] = get_bits(gb, ilog(range - 1));
1201
1202 ff_dlog(NULL, "floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);
1203
1204 offset = 2;
1205 for (i = 0; i < vf->partitions; ++i) {
1206 class = vf->partition_class[i];
1207 cdim = vf->class_dimensions[class];
1208 cbits = vf->class_subclasses[class];
1209 csub = (1 << cbits) - 1;
1210 cval = 0;
1211
1212 ff_dlog(NULL, "Cbits %u\n", cbits);
1213
1214 if (cbits) // this reads all subclasses for this partition's class
1215 cval = get_vlc2(gb, vc->codebooks[vf->class_masterbook[class]].vlc.table,
1216 vc->codebooks[vf->class_masterbook[class]].nb_bits, 3);
1217
1218 for (j = 0; j < cdim; ++j) {
1219 book = vf->subclass_books[class][cval & csub];
1220
1221 ff_dlog(NULL, "book %d Cbits %u cval %u bits:%d\n",
1222 book, cbits, cval, get_bits_count(gb));
1223
1224 cval = cval >> cbits;
1225 if (book > -1) {
1226 floor1_Y[offset+j] = get_vlc2(gb, vc->codebooks[book].vlc.table,
1227 vc->codebooks[book].nb_bits, 3);
1228 } else {
1229 floor1_Y[offset+j] = 0;
1230 }
1231
1232 ff_dlog(NULL, " floor(%d) = %d \n",
1233 vf->list[offset+j].x, floor1_Y[offset+j]);
1234 }
1235 offset+=cdim;
1236 }
1237
1238 // Amplitude calculation from the differences
1239
1240 floor1_flag[0] = 1;
1241 floor1_flag[1] = 1;
1242 floor1_Y_final[0] = floor1_Y[0];
1243 floor1_Y_final[1] = floor1_Y[1];
1244
1245 for (i = 2; i < vf->x_list_dim; ++i) {
1246 unsigned val, highroom, lowroom, room, high_neigh_offs, low_neigh_offs;
1247
1248 low_neigh_offs = vf->list[i].low;
1249 high_neigh_offs = vf->list[i].high;
1250 dy = floor1_Y_final[high_neigh_offs] - floor1_Y_final[low_neigh_offs]; // render_point begin
1251 adx = vf->list[high_neigh_offs].x - vf->list[low_neigh_offs].x;
1252 ady = FFABS(dy);
1253 err = ady * (vf->list[i].x - vf->list[low_neigh_offs].x);
1254 off = err / adx;
1255 if (dy < 0) {
1256 predicted = floor1_Y_final[low_neigh_offs] - off;
1257 } else {
1258 predicted = floor1_Y_final[low_neigh_offs] + off;
1259 } // render_point end
1260
1261 val = floor1_Y[i];
1262 highroom = range-predicted;
1263 lowroom = predicted;
1264 if (highroom < lowroom) {
1265 room = highroom * 2;
1266 } else {
1267 room = lowroom * 2; // SPEC misspelling
1268 }
1269 if (val) {
1270 floor1_flag[low_neigh_offs] = 1;
1271 floor1_flag[high_neigh_offs] = 1;
1272 floor1_flag[i] = 1;
1273 if (val >= room) {
1274 if (highroom > lowroom) {
1275 floor1_Y_final[i] = av_clip_uint16(val - lowroom + predicted);
1276 } else {
1277 floor1_Y_final[i] = av_clip_uint16(predicted - val + highroom - 1);
1278 }
1279 } else {
1280 if (val & 1) {
1281 floor1_Y_final[i] = av_clip_uint16(predicted - (val + 1) / 2);
1282 } else {
1283 floor1_Y_final[i] = av_clip_uint16(predicted + val / 2);
1284 }
1285 }
1286 } else {
1287 floor1_flag[i] = 0;
1288 floor1_Y_final[i] = av_clip_uint16(predicted);
1289 }
1290
1291 ff_dlog(NULL, " Decoded floor(%d) = %u / val %u\n",
1292 vf->list[i].x, floor1_Y_final[i], val);
1293 }
1294
1295 // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?
1296
1297 ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);
1298
1299 ff_dlog(NULL, " Floor decoded\n");
1300
1301 return 0;
1302 }
1303
1304 static av_always_inline int setup_classifs(vorbis_context *vc,
1305 vorbis_residue *vr,
1306 uint8_t *do_not_decode,
1307 unsigned ch_used,
1308 int partition_count)
1309 {
1310 vorbis_codebook *codebook = vc->codebooks + vr->classbook;
1311 int p, j, i;
1312 unsigned c_p_c = codebook->dimensions;
1313 unsigned inverse_class = ff_inverse[vr->classifications];
1314 int temp, temp2;
1315 for (p = 0, j = 0; j < ch_used; ++j) {
1316 if (!do_not_decode[j]) {
1317 temp = get_vlc2(&vc->gb, codebook->vlc.table,
1318 codebook->nb_bits, 3);
1319
1320 ff_dlog(NULL, "Classword: %u\n", temp);
1321
1322 if (temp < 0) {
1323 av_log(vc->avctx, AV_LOG_ERROR,
1324 "Invalid vlc code decoding %d channel.", j);
1325 return AVERROR_INVALIDDATA;
1326 }
1327
1328 for (i = partition_count + c_p_c - 1; i >= partition_count; i--) {
1329 temp2 = (((uint64_t)temp) * inverse_class) >> 32;
1330
1331 if (i < vr->ptns_to_read)
1332 vr->classifs[p + i] = temp - temp2 * vr->classifications;
1333 temp = temp2;
1334 }
1335 }
1336 p += vr->ptns_to_read;
1337 }
1338 return 0;
1339 }
1340 // Read and decode residue
1341
1342 static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc,
1343 vorbis_residue *vr,
1344 unsigned ch,
1345 uint8_t *do_not_decode,
1346 float *vec,
1347 unsigned vlen,
1348 unsigned ch_left,
1349 int vr_type)
1350 {
1351 GetBitContext *gb = &vc->gb;
1352 unsigned c_p_c = vc->codebooks[vr->classbook].dimensions;
1353 uint8_t *classifs = vr->classifs;
1354 unsigned pass, ch_used, i, j, k, l;
1355 unsigned max_output = (ch - 1) * vlen;
1356 int ptns_to_read = vr->ptns_to_read;
1357
1358 if (vr_type == 2) {
1359 for (j = 1; j < ch; ++j)
1360 do_not_decode[0] &= do_not_decode[j]; // FIXME - clobbering input
1361 if (do_not_decode[0])
1362 return 0;
1363 ch_used = 1;
1364 max_output += vr->end / ch;
1365 } else {
1366 ch_used = ch;
1367 max_output += vr->end;
1368 }
1369
1370 if (max_output > ch_left * vlen) {
1371 av_log(vc->avctx, AV_LOG_ERROR, "Insufficient output buffer\n");
1372 return AVERROR_INVALIDDATA;
1373 }
1374
1375 ff_dlog(NULL, " residue type 0/1/2 decode begin, ch: %d cpc %d \n", ch, c_p_c);
1376
1377 for (pass = 0; pass <= vr->maxpass; ++pass) { // FIXME OPTIMIZE?
1378 int voffset, partition_count, j_times_ptns_to_read;
1379
1380 voffset = vr->begin;
1381 for (partition_count = 0; partition_count < ptns_to_read;) { // SPEC error
1382 if (!pass) {
1383 int ret = setup_classifs(vc, vr, do_not_decode, ch_used, partition_count);
1384 if (ret < 0)
1385 return ret;
1386 }
1387 for (i = 0; (i < c_p_c) && (partition_count < ptns_to_read); ++i) {
1388 for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {
1389 unsigned voffs;
1390
1391 if (!do_not_decode[j]) {
1392 unsigned vqclass = classifs[j_times_ptns_to_read + partition_count];
1393 int vqbook = vr->books[vqclass][pass];
1394
1395 if (vqbook >= 0 && vc->codebooks[vqbook].codevectors) {
1396 unsigned coffs;
1397 unsigned dim = vc->codebooks[vqbook].dimensions;
1398 unsigned step = FASTDIV(vr->partition_size << 1, dim << 1);
1399 vorbis_codebook codebook = vc->codebooks[vqbook];
1400
1401 if (vr_type == 0) {
1402
1403 voffs = voffset+j*vlen;
1404 for (k = 0; k < step; ++k) {
1405 coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1406 for (l = 0; l < dim; ++l)
1407 vec[voffs + k + l * step] += codebook.codevectors[coffs + l];
1408 }
1409 } else if (vr_type == 1) {
1410 voffs = voffset + j * vlen;
1411 for (k = 0; k < step; ++k) {
1412 coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1413 for (l = 0; l < dim; ++l, ++voffs) {
1414 vec[voffs]+=codebook.codevectors[coffs+l];
1415
1416 ff_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d \n",
1417 pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);
1418 }
1419 }
1420 } else if (vr_type == 2 && ch == 2 && (voffset & 1) == 0 && (dim & 1) == 0) { // most frequent case optimized
1421 voffs = voffset >> 1;
1422
1423 if (dim == 2) {
1424 for (k = 0; k < step; ++k) {
1425 coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;
1426 vec[voffs + k ] += codebook.codevectors[coffs ];
1427 vec[voffs + k + vlen] += codebook.codevectors[coffs + 1];
1428 }
1429 } else if (dim == 4) {
1430 for (k = 0; k < step; ++k, voffs += 2) {
1431 coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4;
1432 vec[voffs ] += codebook.codevectors[coffs ];
1433 vec[voffs + 1 ] += codebook.codevectors[coffs + 2];
1434 vec[voffs + vlen ] += codebook.codevectors[coffs + 1];
1435 vec[voffs + vlen + 1] += codebook.codevectors[coffs + 3];
1436 }
1437 } else
1438 for (k = 0; k < step; ++k) {
1439 coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1440 for (l = 0; l < dim; l += 2, voffs++) {
1441 vec[voffs ] += codebook.codevectors[coffs + l ];
1442 vec[voffs + vlen] += codebook.codevectors[coffs + l + 1];
1443
1444 ff_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d+%d \n",
1445 pass, voffset / ch + (voffs % ch) * vlen,
1446 vec[voffset / ch + (voffs % ch) * vlen],
1447 codebook.codevectors[coffs + l], coffs, l);
1448 }
1449 }
1450
1451 } else if (vr_type == 2) {
1452 unsigned voffs_div = FASTDIV(voffset << 1, ch <<1);
1453 unsigned voffs_mod = voffset - voffs_div * ch;
1454
1455 for (k = 0; k < step; ++k) {
1456 coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1457 for (l = 0; l < dim; ++l) {
1458 vec[voffs_div + voffs_mod * vlen] +=
1459 codebook.codevectors[coffs + l];
1460
1461 ff_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d+%d \n",
1462 pass, voffs_div + voffs_mod * vlen,
1463 vec[voffs_div + voffs_mod * vlen],
1464 codebook.codevectors[coffs + l], coffs, l);
1465
1466 if (++voffs_mod == ch) {
1467 voffs_div++;
1468 voffs_mod = 0;
1469 }
1470 }
1471 }
1472 }
1473 }
1474 }
1475 j_times_ptns_to_read += ptns_to_read;
1476 }
1477 ++partition_count;
1478 voffset += vr->partition_size;
1479 }
1480 }
1481 }
1482 return 0;
1483 }
1484
1485 static inline int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr,
1486 unsigned ch,
1487 uint8_t *do_not_decode,
1488 float *vec, unsigned vlen,
1489 unsigned ch_left)
1490 {
1491 if (vr->type == 2)
1492 return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 2);
1493 else if (vr->type == 1)
1494 return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 1);
1495 else if (vr->type == 0)
1496 return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 0);
1497 else {
1498 av_log(vc->avctx, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");
1499 return AVERROR_INVALIDDATA;
1500 }
1501 }
1502
1503 void ff_vorbis_inverse_coupling(float *mag, float *ang, intptr_t blocksize)
1504 {
1505 int i;
1506 for (i = 0; i < blocksize; i++) {
1507 if (mag[i] > 0.0) {
1508 if (ang[i] > 0.0) {
1509 ang[i] = mag[i] - ang[i];
1510 } else {
1511 float temp = ang[i];
1512 ang[i] = mag[i];
1513 mag[i] += temp;
1514 }
1515 } else {
1516 if (ang[i] > 0.0) {
1517 ang[i] += mag[i];
1518 } else {
1519 float temp = ang[i];
1520 ang[i] = mag[i];
1521 mag[i] -= temp;
1522 }
1523 }
1524 }
1525 }
1526
1527 // Decode the audio packet using the functions above
1528
1529 static int vorbis_parse_audio_packet(vorbis_context *vc, float **floor_ptr)
1530 {
1531 GetBitContext *gb = &vc->gb;
1532 FFTContext *mdct;
1533 unsigned previous_window = vc->previous_window;
1534 unsigned mode_number, blockflag, blocksize;
1535 int i, j;
1536 uint8_t no_residue[255];
1537 uint8_t do_not_decode[255];
1538 vorbis_mapping *mapping;
1539 float *ch_res_ptr = vc->channel_residues;
1540 uint8_t res_chan[255];
1541 unsigned res_num = 0;
1542 int retlen = 0;
1543 unsigned ch_left = vc->audio_channels;
1544 unsigned vlen;
1545
1546 if (get_bits1(gb)) {
1547 av_log(vc->avctx, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");
1548 return AVERROR_INVALIDDATA; // packet type not audio
1549 }
1550
1551 if (vc->mode_count == 1) {
1552 mode_number = 0;
1553 } else {
1554 GET_VALIDATED_INDEX(mode_number, ilog(vc->mode_count-1), vc->mode_count)
1555 }
1556 vc->mode_number = mode_number;
1557 mapping = &vc->mappings[vc->modes[mode_number].mapping];
1558
1559 ff_dlog(NULL, " Mode number: %u , mapping: %d , blocktype %d\n", mode_number,
1560 vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);
1561
1562 blockflag = vc->modes[mode_number].blockflag;
1563 blocksize = vc->blocksize[blockflag];
1564 vlen = blocksize / 2;
1565 if (blockflag) {
1566 previous_window = get_bits(gb, 1);
1567 skip_bits1(gb); // next_window
1568 }
1569
1570 memset(ch_res_ptr, 0, sizeof(float) * vc->audio_channels * vlen); //FIXME can this be removed ?
1571 for (i = 0; i < vc->audio_channels; ++i)
1572 memset(floor_ptr[i], 0, vlen * sizeof(floor_ptr[0][0])); //FIXME can this be removed ?
1573
1574 // Decode floor
1575
1576 for (i = 0; i < vc->audio_channels; ++i) {
1577 vorbis_floor *floor;
1578 int ret;
1579 if (mapping->submaps > 1) {
1580 floor = &vc->floors[mapping->submap_floor[mapping->mux[i]]];
1581 } else {
1582 floor = &vc->floors[mapping->submap_floor[0]];
1583 }
1584
1585 ret = floor->decode(vc, &floor->data, floor_ptr[i]);
1586
1587 if (ret < 0) {
1588 av_log(vc->avctx, AV_LOG_ERROR, "Invalid codebook in vorbis_floor_decode.\n");
1589 return AVERROR_INVALIDDATA;
1590 }
1591 no_residue[i] = ret;
1592 }
1593
1594 // Nonzero vector propagate
1595
1596 for (i = mapping->coupling_steps - 1; i >= 0; --i) {
1597 if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {
1598 no_residue[mapping->magnitude[i]] = 0;
1599 no_residue[mapping->angle[i]] = 0;
1600 }
1601 }
1602
1603 // Decode residue
1604
1605 for (i = 0; i < mapping->submaps; ++i) {
1606 vorbis_residue *residue;
1607 unsigned ch = 0;
1608 int ret;
1609
1610 for (j = 0; j < vc->audio_channels; ++j) {
1611 if ((mapping->submaps == 1) || (i == mapping->mux[j])) {
1612 res_chan[j] = res_num;
1613 if (no_residue[j]) {
1614 do_not_decode[ch] = 1;
1615 } else {
1616 do_not_decode[ch] = 0;
1617 }
1618 ++ch;
1619 ++res_num;
1620 }
1621 }
1622 residue = &vc->residues[mapping->submap_residue[i]];
1623 if (ch_left < ch) {
1624 av_log(vc->avctx, AV_LOG_ERROR, "Too many channels in vorbis_floor_decode.\n");
1625 return AVERROR_INVALIDDATA;
1626 }
1627 if (ch) {
1628 ret = vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, vlen, ch_left);
1629 if (ret < 0)
1630 return ret;
1631 }
1632
1633 ch_res_ptr += ch * vlen;
1634 ch_left -= ch;
1635 }
1636
1637 if (ch_left > 0)
1638 return AVERROR_INVALIDDATA;
1639
1640 // Inverse coupling
1641
1642 for (i = mapping->coupling_steps - 1; i >= 0; --i) { //warning: i has to be signed
1643 float *mag, *ang;
1644
1645 mag = vc->channel_residues+res_chan[mapping->magnitude[i]] * blocksize / 2;
1646 ang = vc->channel_residues+res_chan[mapping->angle[i]] * blocksize / 2;
1647 vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize / 2);
1648 }
1649
1650 // Dotproduct, MDCT
1651
1652 mdct = &vc->mdct[blockflag];
1653
1654 for (j = vc->audio_channels-1;j >= 0; j--) {
1655 ch_res_ptr = vc->channel_residues + res_chan[j] * blocksize / 2;
1656 vc->fdsp.vector_fmul(floor_ptr[j], floor_ptr[j], ch_res_ptr, blocksize / 2);
1657 mdct->imdct_half(mdct, ch_res_ptr, floor_ptr[j]);
1658 }
1659
1660 // Overlap/add, save data for next overlapping
1661
1662 retlen = (blocksize + vc->blocksize[previous_window]) / 4;
1663 for (j = 0; j < vc->audio_channels; j++) {
1664 unsigned bs0 = vc->blocksize[0];
1665 unsigned bs1 = vc->blocksize[1];
1666 float *residue = vc->channel_residues + res_chan[j] * blocksize / 2;
1667 float *saved = vc->saved + j * bs1 / 4;
1668 float *ret = floor_ptr[j];
1669 float *buf = residue;
1670 const float *win = vc->win[blockflag & previous_window];
1671
1672 if (blockflag == previous_window) {
1673 vc->fdsp.vector_fmul_window(ret, saved, buf, win, blocksize / 4);
1674 } else if (blockflag > previous_window) {
1675 vc->fdsp.vector_fmul_window(ret, saved, buf, win, bs0 / 4);
1676 memcpy(ret+bs0/2, buf+bs0/4, ((bs1-bs0)/4) * sizeof(float));
1677 } else {
1678 memcpy(ret, saved, ((bs1 - bs0) / 4) * sizeof(float));
1679 vc->fdsp.vector_fmul_window(ret + (bs1 - bs0) / 4, saved + (bs1 - bs0) / 4, buf, win, bs0 / 4);
1680 }
1681 memcpy(saved, buf + blocksize / 4, blocksize / 4 * sizeof(float));
1682 }
1683
1684 vc->previous_window = blockflag;
1685 return retlen;
1686 }
1687
1688 // Return the decoded audio packet through the standard api
1689
1690 static int vorbis_decode_frame(AVCodecContext *avctx, void *data,
1691 int *got_frame_ptr, AVPacket *avpkt)
1692 {
1693 const uint8_t *buf = avpkt->data;
1694 int buf_size = avpkt->size;
1695 vorbis_context *vc = avctx->priv_data;
1696 AVFrame *frame = data;
1697 GetBitContext *gb = &vc->gb;
1698 float *channel_ptrs[255];
1699 int i, len, ret;
1700
1701 ff_dlog(NULL, "packet length %d \n", buf_size);
1702
1703 /* get output buffer */
1704 frame->nb_samples = vc->blocksize[1] / 2;
1705 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
1706 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
1707 return ret;
1708 }
1709
1710 if (vc->audio_channels > 8) {
1711 for (i = 0; i < vc->audio_channels; i++)
1712 channel_ptrs[i] = (float *)frame->extended_data[i];
1713 } else {
1714 for (i = 0; i < vc->audio_channels; i++) {
1715 int ch = ff_vorbis_channel_layout_offsets[vc->audio_channels - 1][i];
1716 channel_ptrs[ch] = (float *)frame->extended_data[i];
1717 }
1718 }
1719
1720 init_get_bits(gb, buf, buf_size*8);
1721
1722 if ((len = vorbis_parse_audio_packet(vc, channel_ptrs)) <= 0)
1723 return len;
1724
1725 if (!vc->first_frame) {
1726 vc->first_frame = 1;
1727 *got_frame_ptr = 0;
1728 av_frame_unref(frame);
1729 return buf_size;
1730 }
1731
1732 ff_dlog(NULL, "parsed %d bytes %d bits, returned %d samples (*ch*bits) \n",
1733 get_bits_count(gb) / 8, get_bits_count(gb) % 8, len);
1734
1735 frame->nb_samples = len;
1736 *got_frame_ptr = 1;
1737
1738 return buf_size;
1739 }
1740
1741 // Close decoder
1742
1743 static av_cold int vorbis_decode_close(AVCodecContext *avctx)
1744 {
1745 vorbis_context *vc = avctx->priv_data;
1746
1747 vorbis_free(vc);
1748
1749 return 0;
1750 }
1751
1752 static av_cold void vorbis_decode_flush(AVCodecContext *avctx)
1753 {
1754 vorbis_context *vc = avctx->priv_data;
1755
1756 if (vc->saved) {
1757 memset(vc->saved, 0, (vc->blocksize[1] / 4) * vc->audio_channels *
1758 sizeof(*vc->saved));
1759 }
1760 vc->previous_window = 0;
1761 }
1762
1763 AVCodec ff_vorbis_decoder = {
1764 .name = "vorbis",
1765 .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),
1766 .type = AVMEDIA_TYPE_AUDIO,
1767 .id = AV_CODEC_ID_VORBIS,
1768 .priv_data_size = sizeof(vorbis_context),
1769 .init = vorbis_decode_init,
1770 .close = vorbis_decode_close,
1771 .decode = vorbis_decode_frame,
1772 .flush = vorbis_decode_flush,
1773 .capabilities = AV_CODEC_CAP_DR1,
1774 .channel_layouts = ff_vorbis_channel_layouts,
1775 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
1776 AV_SAMPLE_FMT_NONE },
1777 };