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aarch64: Add assembly support for -fsanitize=hwaddress tagged globals.
[libav.git] / libavcodec / vorbisdec.c
blobcc0f6f4a3ec0d5b4ae13d51012a57283627d3f1e
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 "vlc.h"
36 #include "vorbis.h"
37 #include "vorbisdsp.h"
38 #include "xiph.h"
39
40 #define V_NB_BITS 8
41 #define V_NB_BITS2 11
42 #define V_MAX_VLCS (1 << 16)
43 #define V_MAX_PARTITIONS (1 << 20)
44
45 typedef struct vorbis_codebook {
46 uint8_t dimensions;
47 uint8_t lookup_type;
48 uint8_t maxdepth;
49 VLC vlc;
50 float *codevectors;
51 unsigned int nb_bits;
52 } vorbis_codebook;
53
54 typedef union vorbis_floor_u vorbis_floor_data;
55 typedef struct vorbis_floor0_s vorbis_floor0;
56 typedef struct vorbis_floor1_s vorbis_floor1;
57 struct vorbis_context_s;
58 typedef
59 int (* vorbis_floor_decode_func)
60 (struct vorbis_context_s *, vorbis_floor_data *, float *);
61 typedef struct vorbis_floor {
62 uint8_t floor_type;
63 vorbis_floor_decode_func decode;
64 union vorbis_floor_u {
65 struct vorbis_floor0_s {
66 uint8_t order;
67 uint16_t rate;
68 uint16_t bark_map_size;
69 int32_t *map[2];
70 uint32_t map_size[2];
71 uint8_t amplitude_bits;
72 uint8_t amplitude_offset;
73 uint8_t num_books;
74 uint8_t *book_list;
75 float *lsp;
76 } t0;
77 struct vorbis_floor1_s {
78 uint8_t partitions;
79 uint8_t partition_class[32];
80 uint8_t class_dimensions[16];
81 uint8_t class_subclasses[16];
82 uint8_t class_masterbook[16];
83 int16_t subclass_books[16][8];
84 uint8_t multiplier;
85 uint16_t x_list_dim;
86 vorbis_floor1_entry *list;
87 } t1;
88 } data;
89 } vorbis_floor;
90
91 typedef struct vorbis_residue {
92 uint16_t type;
93 uint32_t begin;
94 uint32_t end;
95 unsigned partition_size;
96 uint8_t classifications;
97 uint8_t classbook;
98 int16_t books[64][8];
99 uint8_t maxpass;
100 uint16_t ptns_to_read;
101 uint8_t *classifs;
102 } vorbis_residue;
103
104 typedef struct vorbis_mapping {
105 uint8_t submaps;
106 uint16_t coupling_steps;
107 uint8_t *magnitude;
108 uint8_t *angle;
109 uint8_t *mux;
110 uint8_t submap_floor[16];
111 uint8_t submap_residue[16];
112 } vorbis_mapping;
113
114 typedef struct vorbis_mode {
115 uint8_t blockflag;
116 uint16_t windowtype;
117 uint16_t transformtype;
118 uint8_t mapping;
119 } vorbis_mode;
120
121 typedef struct vorbis_context_s {
122 AVCodecContext *avctx;
123 GetBitContext gb;
124 VorbisDSPContext dsp;
125 AVFloatDSPContext fdsp;
126
127 FFTContext mdct[2];
128 uint8_t first_frame;
129 uint32_t version;
130 uint8_t audio_channels;
131 uint32_t audio_samplerate;
132 uint32_t bitrate_maximum;
133 uint32_t bitrate_nominal;
134 uint32_t bitrate_minimum;
135 uint32_t blocksize[2];
136 const float *win[2];
137 uint16_t codebook_count;
138 vorbis_codebook *codebooks;
139 uint8_t floor_count;
140 vorbis_floor *floors;
141 uint8_t residue_count;
142 vorbis_residue *residues;
143 uint8_t mapping_count;
144 vorbis_mapping *mappings;
145 uint8_t mode_count;
146 vorbis_mode *modes;
147 uint8_t mode_number; // mode number for the current packet
148 uint8_t previous_window;
149 float *channel_residues;
150 float *saved;
151 } vorbis_context;
152
153 /* Helper functions */
154
155 #define BARK(x) \
156 (13.1f * atan(0.00074f * (x)) + 2.24f * atan(1.85e-8f * (x) * (x)) + 1e-4f * (x))
157
158 static const char idx_err_str[] = "Index value %d out of range (0 - %d) for %s at %s:%i\n";
159 #define VALIDATE_INDEX(idx, limit) \
160 if (idx >= limit) {\
161 av_log(vc->avctx, AV_LOG_ERROR,\
162 idx_err_str,\
163 (int)(idx), (int)(limit - 1), #idx, __FILE__, __LINE__);\
164 return AVERROR_INVALIDDATA;\
165 }
166 #define GET_VALIDATED_INDEX(idx, bits, limit) \
167 {\
168 idx = get_bits(gb, bits);\
169 VALIDATE_INDEX(idx, limit)\
170 }
171
172 static float vorbisfloat2float(unsigned val)
173 {
174 double mant = val & 0x1fffff;
175 long exp = (val & 0x7fe00000L) >> 21;
176 if (val & 0x80000000)
177 mant = -mant;
178 return ldexp(mant, exp - 20 - 768);
179 }
180
181
182 // Free all allocated memory -----------------------------------------
183
184 static void vorbis_free(vorbis_context *vc)
185 {
186 int i;
187
188 av_freep(&vc->channel_residues);
189 av_freep(&vc->saved);
190
191 for (i = 0; i < vc->residue_count; i++)
192 av_free(vc->residues[i].classifs);
193 av_freep(&vc->residues);
194 av_freep(&vc->modes);
195
196 ff_mdct_end(&vc->mdct[0]);
197 ff_mdct_end(&vc->mdct[1]);
198
199 for (i = 0; i < vc->codebook_count; ++i) {
200 av_free(vc->codebooks[i].codevectors);
201 ff_free_vlc(&vc->codebooks[i].vlc);
202 }
203 av_freep(&vc->codebooks);
204
205 for (i = 0; i < vc->floor_count; ++i) {
206 if (vc->floors[i].floor_type == 0) {
207 av_free(vc->floors[i].data.t0.map[0]);
208 av_free(vc->floors[i].data.t0.map[1]);
209 av_free(vc->floors[i].data.t0.book_list);
210 av_free(vc->floors[i].data.t0.lsp);
211 } else {
212 av_free(vc->floors[i].data.t1.list);
213 }
214 }
215 av_freep(&vc->floors);
216
217 for (i = 0; i < vc->mapping_count; ++i) {
218 av_free(vc->mappings[i].magnitude);
219 av_free(vc->mappings[i].angle);
220 av_free(vc->mappings[i].mux);
221 }
222 av_freep(&vc->mappings);
223 }
224
225 // Parse setup header -------------------------------------------------
226
227 // Process codebooks part
228
229 static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc)
230 {
231 unsigned cb;
232 uint8_t *tmp_vlc_bits = NULL;
233 uint32_t *tmp_vlc_codes = NULL;
234 GetBitContext *gb = &vc->gb;
235 uint16_t *codebook_multiplicands = NULL;
236 int ret = 0;
237
238 vc->codebook_count = get_bits(gb, 8) + 1;
239
240 ff_dlog(NULL, " Codebooks: %d \n", vc->codebook_count);
241
242 vc->codebooks = av_mallocz(vc->codebook_count * sizeof(*vc->codebooks));
243 tmp_vlc_bits = av_mallocz(V_MAX_VLCS * sizeof(*tmp_vlc_bits));
244 tmp_vlc_codes = av_mallocz(V_MAX_VLCS * sizeof(*tmp_vlc_codes));
245 codebook_multiplicands = av_malloc(V_MAX_VLCS * sizeof(*codebook_multiplicands));
246 if (!vc->codebooks ||
247 !tmp_vlc_bits || !tmp_vlc_codes || !codebook_multiplicands) {
248 ret = AVERROR(ENOMEM);
249 goto error;
250 }
251
252 for (cb = 0; cb < vc->codebook_count; ++cb) {
253 vorbis_codebook *codebook_setup = &vc->codebooks[cb];
254 unsigned ordered, t, entries, used_entries = 0;
255
256 ff_dlog(NULL, " %u. Codebook\n", cb);
257
258 if (get_bits(gb, 24) != 0x564342) {
259 av_log(vc->avctx, AV_LOG_ERROR,
260 " %u. Codebook setup data corrupt.\n", cb);
261 ret = AVERROR_INVALIDDATA;
262 goto error;
263 }
264
265 codebook_setup->dimensions=get_bits(gb, 16);
266 if (codebook_setup->dimensions > 16 || codebook_setup->dimensions == 0) {
267 av_log(vc->avctx, AV_LOG_ERROR,
268 " %u. Codebook's dimension is invalid (%d).\n",
269 cb, codebook_setup->dimensions);
270 ret = AVERROR_INVALIDDATA;
271 goto error;
272 }
273 entries = get_bits(gb, 24);
274 if (entries > V_MAX_VLCS) {
275 av_log(vc->avctx, AV_LOG_ERROR,
276 " %u. Codebook has too many entries (%u).\n",
277 cb, entries);
278 ret = AVERROR_INVALIDDATA;
279 goto error;
280 }
281
282 ordered = get_bits1(gb);
283
284 ff_dlog(NULL, " codebook_dimensions %d, codebook_entries %u\n",
285 codebook_setup->dimensions, entries);
286
287 if (!ordered) {
288 unsigned ce, flag;
289 unsigned sparse = get_bits1(gb);
290
291 ff_dlog(NULL, " not ordered \n");
292
293 if (sparse) {
294 ff_dlog(NULL, " sparse \n");
295
296 used_entries = 0;
297 for (ce = 0; ce < entries; ++ce) {
298 flag = get_bits1(gb);
299 if (flag) {
300 tmp_vlc_bits[ce] = get_bits(gb, 5) + 1;
301 ++used_entries;
302 } else
303 tmp_vlc_bits[ce] = 0;
304 }
305 } else {
306 ff_dlog(NULL, " not sparse \n");
307
308 used_entries = entries;
309 for (ce = 0; ce < entries; ++ce)
310 tmp_vlc_bits[ce] = get_bits(gb, 5) + 1;
311 }
312 } else {
313 unsigned current_entry = 0;
314 unsigned current_length = get_bits(gb, 5) + 1;
315
316 ff_dlog(NULL, " ordered, current length: %u\n", current_length); //FIXME
317
318 used_entries = entries;
319 for (; current_entry < used_entries && current_length <= 32; ++current_length) {
320 unsigned i, number;
321
322 ff_dlog(NULL, " number bits: %u ", ilog(entries - current_entry));
323
324 number = get_bits(gb, ilog(entries - current_entry));
325
326 ff_dlog(NULL, " number: %u\n", number);
327
328 for (i = current_entry; i < number+current_entry; ++i)
329 if (i < used_entries)
330 tmp_vlc_bits[i] = current_length;
331
332 current_entry+=number;
333 }
334 if (current_entry>used_entries) {
335 av_log(vc->avctx, AV_LOG_ERROR, " More codelengths than codes in codebook. \n");
336 ret = AVERROR_INVALIDDATA;
337 goto error;
338 }
339 }
340
341 codebook_setup->lookup_type = get_bits(gb, 4);
342
343 ff_dlog(NULL, " lookup type: %d : %s \n", codebook_setup->lookup_type,
344 codebook_setup->lookup_type ? "vq" : "no lookup");
345
346 // If the codebook is used for (inverse) VQ, calculate codevectors.
347
348 if (codebook_setup->lookup_type == 1) {
349 unsigned i, j, k;
350 unsigned codebook_lookup_values = ff_vorbis_nth_root(entries, codebook_setup->dimensions);
351
352 float codebook_minimum_value = vorbisfloat2float(get_bits_long(gb, 32));
353 float codebook_delta_value = vorbisfloat2float(get_bits_long(gb, 32));
354 unsigned codebook_value_bits = get_bits(gb, 4) + 1;
355 unsigned codebook_sequence_p = get_bits1(gb);
356
357 ff_dlog(NULL, " We expect %d numbers for building the codevectors. \n",
358 codebook_lookup_values);
359 ff_dlog(NULL, " delta %f minmum %f \n",
360 codebook_delta_value, codebook_minimum_value);
361
362 for (i = 0; i < codebook_lookup_values; ++i) {
363 codebook_multiplicands[i] = get_bits(gb, codebook_value_bits);
364
365 ff_dlog(NULL, " multiplicands*delta+minmum : %e \n",
366 (float)codebook_multiplicands[i] * codebook_delta_value + codebook_minimum_value);
367 ff_dlog(NULL, " multiplicand %u\n", codebook_multiplicands[i]);
368 }
369
370 // Weed out unused vlcs and build codevector vector
371 if (used_entries) {
372 codebook_setup->codevectors =
373 av_mallocz(used_entries * codebook_setup->dimensions *
374 sizeof(*codebook_setup->codevectors));
375 if (!codebook_setup->codevectors)
376 return AVERROR(ENOMEM);
377 } else
378 codebook_setup->codevectors = NULL;
379
380 for (j = 0, i = 0; i < entries; ++i) {
381 unsigned dim = codebook_setup->dimensions;
382
383 if (tmp_vlc_bits[i]) {
384 float last = 0.0;
385 unsigned lookup_offset = i;
386
387 ff_dlog(vc->avctx, "Lookup offset %u ,", i);
388
389 for (k = 0; k < dim; ++k) {
390 unsigned multiplicand_offset = lookup_offset % codebook_lookup_values;
391 codebook_setup->codevectors[j * dim + k] = codebook_multiplicands[multiplicand_offset] * codebook_delta_value + codebook_minimum_value + last;
392 if (codebook_sequence_p)
393 last = codebook_setup->codevectors[j * dim + k];
394 lookup_offset/=codebook_lookup_values;
395 }
396 tmp_vlc_bits[j] = tmp_vlc_bits[i];
397
398 ff_dlog(vc->avctx, "real lookup offset %u, vector: ", j);
399 for (k = 0; k < dim; ++k)
400 ff_dlog(vc->avctx, " %f ",
401 codebook_setup->codevectors[j * dim + k]);
402 ff_dlog(vc->avctx, "\n");
403
404 ++j;
405 }
406 }
407 if (j != used_entries) {
408 av_log(vc->avctx, AV_LOG_ERROR, "Bug in codevector vector building code. \n");
409 ret = AVERROR_INVALIDDATA;
410 goto error;
411 }
412 entries = used_entries;
413 } else if (codebook_setup->lookup_type >= 2) {
414 av_log(vc->avctx, AV_LOG_ERROR, "Codebook lookup type not supported. \n");
415 ret = AVERROR_INVALIDDATA;
416 goto error;
417 }
418
419 // Initialize VLC table
420 if (ff_vorbis_len2vlc(tmp_vlc_bits, tmp_vlc_codes, entries)) {
421 av_log(vc->avctx, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");
422 ret = AVERROR_INVALIDDATA;
423 goto error;
424 }
425 codebook_setup->maxdepth = 0;
426 for (t = 0; t < entries; ++t)
427 if (tmp_vlc_bits[t] >= codebook_setup->maxdepth)
428 codebook_setup->maxdepth = tmp_vlc_bits[t];
429
430 if (codebook_setup->maxdepth > 3 * V_NB_BITS)
431 codebook_setup->nb_bits = V_NB_BITS2;
432 else
433 codebook_setup->nb_bits = V_NB_BITS;
434
435 codebook_setup->maxdepth = (codebook_setup->maxdepth+codebook_setup->nb_bits - 1) / codebook_setup->nb_bits;
436
437 if ((ret = init_vlc(&codebook_setup->vlc, codebook_setup->nb_bits,
438 entries, tmp_vlc_bits, sizeof(*tmp_vlc_bits),
439 sizeof(*tmp_vlc_bits), tmp_vlc_codes,
440 sizeof(*tmp_vlc_codes), sizeof(*tmp_vlc_codes),
441 INIT_VLC_LE))) {
442 av_log(vc->avctx, AV_LOG_ERROR, " Error generating vlc tables. \n");
443 goto error;
444 }
445 }
446
447 av_free(tmp_vlc_bits);
448 av_free(tmp_vlc_codes);
449 av_free(codebook_multiplicands);
450 return 0;
451
452 // Error:
453 error:
454 av_free(tmp_vlc_bits);
455 av_free(tmp_vlc_codes);
456 av_free(codebook_multiplicands);
457 return ret;
458 }
459
460 // Process time domain transforms part (unused in Vorbis I)
461
462 static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc)
463 {
464 GetBitContext *gb = &vc->gb;
465 unsigned i, vorbis_time_count = get_bits(gb, 6) + 1;
466
467 for (i = 0; i < vorbis_time_count; ++i) {
468 unsigned vorbis_tdtransform = get_bits(gb, 16);
469
470 ff_dlog(NULL, " Vorbis time domain transform %u: %u\n",
471 vorbis_time_count, vorbis_tdtransform);
472
473 if (vorbis_tdtransform) {
474 av_log(vc->avctx, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n");
475 return AVERROR_INVALIDDATA;
476 }
477 }
478 return 0;
479 }
480
481 // Process floors part
482
483 static int vorbis_floor0_decode(vorbis_context *vc,
484 vorbis_floor_data *vfu, float *vec);
485 static int create_map(vorbis_context *vc, unsigned floor_number);
486 static int vorbis_floor1_decode(vorbis_context *vc,
487 vorbis_floor_data *vfu, float *vec);
488 static int vorbis_parse_setup_hdr_floors(vorbis_context *vc)
489 {
490 GetBitContext *gb = &vc->gb;
491 int i, j, k, ret;
492
493 vc->floor_count = get_bits(gb, 6) + 1;
494
495 vc->floors = av_mallocz(vc->floor_count * sizeof(*vc->floors));
496 if (!vc->floors)
497 return AVERROR(ENOMEM);
498
499 for (i = 0; i < vc->floor_count; ++i) {
500 vorbis_floor *floor_setup = &vc->floors[i];
501
502 floor_setup->floor_type = get_bits(gb, 16);
503
504 ff_dlog(NULL, " %d. floor type %d \n", i, floor_setup->floor_type);
505
506 if (floor_setup->floor_type == 1) {
507 int maximum_class = -1;
508 unsigned rangebits, rangemax, floor1_values = 2;
509
510 floor_setup->decode = vorbis_floor1_decode;
511
512 floor_setup->data.t1.partitions = get_bits(gb, 5);
513
514 ff_dlog(NULL, " %d.floor: %d partitions \n",
515 i, floor_setup->data.t1.partitions);
516
517 for (j = 0; j < floor_setup->data.t1.partitions; ++j) {
518 floor_setup->data.t1.partition_class[j] = get_bits(gb, 4);
519 if (floor_setup->data.t1.partition_class[j] > maximum_class)
520 maximum_class = floor_setup->data.t1.partition_class[j];
521
522 ff_dlog(NULL, " %d. floor %d partition class %d \n",
523 i, j, floor_setup->data.t1.partition_class[j]);
524
525 }
526
527 ff_dlog(NULL, " maximum class %d \n", maximum_class);
528
529 for (j = 0; j <= maximum_class; ++j) {
530 floor_setup->data.t1.class_dimensions[j] = get_bits(gb, 3) + 1;
531 floor_setup->data.t1.class_subclasses[j] = get_bits(gb, 2);
532
533 ff_dlog(NULL, " %d floor %d class dim: %d subclasses %d \n", i, j,
534 floor_setup->data.t1.class_dimensions[j],
535 floor_setup->data.t1.class_subclasses[j]);
536
537 if (floor_setup->data.t1.class_subclasses[j]) {
538 GET_VALIDATED_INDEX(floor_setup->data.t1.class_masterbook[j], 8, vc->codebook_count)
539
540 ff_dlog(NULL, " masterbook: %d \n", floor_setup->data.t1.class_masterbook[j]);
541 }
542
543 for (k = 0; k < (1 << floor_setup->data.t1.class_subclasses[j]); ++k) {
544 int16_t bits = get_bits(gb, 8) - 1;
545 if (bits != -1)
546 VALIDATE_INDEX(bits, vc->codebook_count)
547 floor_setup->data.t1.subclass_books[j][k] = bits;
548
549 ff_dlog(NULL, " book %d. : %d \n", k, floor_setup->data.t1.subclass_books[j][k]);
550 }
551 }
552
553 floor_setup->data.t1.multiplier = get_bits(gb, 2) + 1;
554 floor_setup->data.t1.x_list_dim = 2;
555
556 for (j = 0; j < floor_setup->data.t1.partitions; ++j)
557 floor_setup->data.t1.x_list_dim+=floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];
558
559 floor_setup->data.t1.list = av_mallocz(floor_setup->data.t1.x_list_dim *
560 sizeof(*floor_setup->data.t1.list));
561 if (!floor_setup->data.t1.list)
562 return AVERROR(ENOMEM);
563
564 rangebits = get_bits(gb, 4);
565 rangemax = (1 << rangebits);
566 if (rangemax > vc->blocksize[1] / 2) {
567 av_log(vc->avctx, AV_LOG_ERROR,
568 "Floor value is too large for blocksize: %u (%"PRIu32")\n",
569 rangemax, vc->blocksize[1] / 2);
570 return AVERROR_INVALIDDATA;
571 }
572 floor_setup->data.t1.list[0].x = 0;
573 floor_setup->data.t1.list[1].x = rangemax;
574
575 for (j = 0; j < floor_setup->data.t1.partitions; ++j) {
576 for (k = 0; k < floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]]; ++k, ++floor1_values) {
577 floor_setup->data.t1.list[floor1_values].x = get_bits(gb, rangebits);
578
579 ff_dlog(NULL, " %u. floor1 Y coord. %d\n", floor1_values,
580 floor_setup->data.t1.list[floor1_values].x);
581 }
582 }
583
584 // Precalculate order of x coordinates - needed for decode
585 if (ff_vorbis_ready_floor1_list(vc->avctx,
586 floor_setup->data.t1.list,
587 floor_setup->data.t1.x_list_dim)) {
588 return AVERROR_INVALIDDATA;
589 }
590 } else if (floor_setup->floor_type == 0) {
591 unsigned max_codebook_dim = 0;
592
593 floor_setup->decode = vorbis_floor0_decode;
594
595 floor_setup->data.t0.order = get_bits(gb, 8);
596 if (!floor_setup->data.t0.order) {
597 av_log(vc->avctx, AV_LOG_ERROR, "Floor 0 order is 0.\n");
598 return AVERROR_INVALIDDATA;
599 }
600 floor_setup->data.t0.rate = get_bits(gb, 16);
601 if (!floor_setup->data.t0.rate) {
602 av_log(vc->avctx, AV_LOG_ERROR, "Floor 0 rate is 0.\n");
603 return AVERROR_INVALIDDATA;
604 }
605 floor_setup->data.t0.bark_map_size = get_bits(gb, 16);
606 if (!floor_setup->data.t0.bark_map_size) {
607 av_log(vc->avctx, AV_LOG_ERROR,
608 "Floor 0 bark map size is 0.\n");
609 return AVERROR_INVALIDDATA;
610 }
611 floor_setup->data.t0.amplitude_bits = get_bits(gb, 6);
612 floor_setup->data.t0.amplitude_offset = get_bits(gb, 8);
613 floor_setup->data.t0.num_books = get_bits(gb, 4) + 1;
614
615 /* allocate mem for booklist */
616 floor_setup->data.t0.book_list =
617 av_malloc(floor_setup->data.t0.num_books);
618 if (!floor_setup->data.t0.book_list)
619 return AVERROR(ENOMEM);
620 /* read book indexes */
621 {
622 int idx;
623 unsigned book_idx;
624 for (idx = 0; idx < floor_setup->data.t0.num_books; ++idx) {
625 GET_VALIDATED_INDEX(book_idx, 8, vc->codebook_count)
626 floor_setup->data.t0.book_list[idx] = book_idx;
627 if (vc->codebooks[book_idx].dimensions > max_codebook_dim)
628 max_codebook_dim = vc->codebooks[book_idx].dimensions;
629 }
630 }
631
632 if ((ret = create_map(vc, i)) < 0)
633 return ret;
634
635 /* codebook dim is for padding if codebook dim doesn't *
636 * divide order+1 then we need to read more data */
637 floor_setup->data.t0.lsp =
638 av_malloc((floor_setup->data.t0.order + 1 + max_codebook_dim)
639 * sizeof(*floor_setup->data.t0.lsp));
640 if (!floor_setup->data.t0.lsp)
641 return AVERROR(ENOMEM);
642
643 /* debug output parsed headers */
644 ff_dlog(NULL, "floor0 order: %u\n", floor_setup->data.t0.order);
645 ff_dlog(NULL, "floor0 rate: %u\n", floor_setup->data.t0.rate);
646 ff_dlog(NULL, "floor0 bark map size: %u\n",
647 floor_setup->data.t0.bark_map_size);
648 ff_dlog(NULL, "floor0 amplitude bits: %u\n",
649 floor_setup->data.t0.amplitude_bits);
650 ff_dlog(NULL, "floor0 amplitude offset: %u\n",
651 floor_setup->data.t0.amplitude_offset);
652 ff_dlog(NULL, "floor0 number of books: %u\n",
653 floor_setup->data.t0.num_books);
654 ff_dlog(NULL, "floor0 book list pointer: %p\n",
655 floor_setup->data.t0.book_list);
656 {
657 int idx;
658 for (idx = 0; idx < floor_setup->data.t0.num_books; ++idx) {
659 ff_dlog(NULL, " Book %d: %u\n", idx + 1,
660 floor_setup->data.t0.book_list[idx]);
661 }
662 }
663 } else {
664 av_log(vc->avctx, AV_LOG_ERROR, "Invalid floor type!\n");
665 return AVERROR_INVALIDDATA;
666 }
667 }
668 return 0;
669 }
670
671 // Process residues part
672
673 static int vorbis_parse_setup_hdr_residues(vorbis_context *vc)
674 {
675 GetBitContext *gb = &vc->gb;
676 unsigned i, j, k;
677
678 vc->residue_count = get_bits(gb, 6)+1;
679 vc->residues = av_mallocz(vc->residue_count * sizeof(*vc->residues));
680 if (!vc->residues)
681 return AVERROR(ENOMEM);
682
683 ff_dlog(NULL, " There are %d residues. \n", vc->residue_count);
684
685 for (i = 0; i < vc->residue_count; ++i) {
686 vorbis_residue *res_setup = &vc->residues[i];
687 uint8_t cascade[64];
688 unsigned high_bits, low_bits;
689
690 res_setup->type = get_bits(gb, 16);
691
692 ff_dlog(NULL, " %u. residue type %d\n", i, res_setup->type);
693
694 res_setup->begin = get_bits(gb, 24);
695 res_setup->end = get_bits(gb, 24);
696 res_setup->partition_size = get_bits(gb, 24) + 1;
697 /* Validations to prevent a buffer overflow later. */
698 if (res_setup->begin>res_setup->end ||
699 res_setup->end > (res_setup->type == 2 ? vc->avctx->channels : 1) * vc->blocksize[1] / 2 ||
700 (res_setup->end-res_setup->begin) / res_setup->partition_size > V_MAX_PARTITIONS) {
701 av_log(vc->avctx, AV_LOG_ERROR,
702 "partition out of bounds: type, begin, end, size, blocksize: %"PRIu16", %"PRIu32", %"PRIu32", %u, %"PRIu32"\n",
703 res_setup->type, res_setup->begin, res_setup->end,
704 res_setup->partition_size, vc->blocksize[1] / 2);
705 return AVERROR_INVALIDDATA;
706 }
707
708 res_setup->classifications = get_bits(gb, 6) + 1;
709 GET_VALIDATED_INDEX(res_setup->classbook, 8, vc->codebook_count)
710
711 res_setup->ptns_to_read =
712 (res_setup->end - res_setup->begin) / res_setup->partition_size;
713 res_setup->classifs = av_malloc(res_setup->ptns_to_read *
714 vc->audio_channels *
715 sizeof(*res_setup->classifs));
716 if (!res_setup->classifs)
717 return AVERROR(ENOMEM);
718
719 ff_dlog(NULL, " begin %"PRIu32" end %"PRIu32" part.size %u classif.s %"PRIu8" classbook %"PRIu8"\n",
720 res_setup->begin, res_setup->end, res_setup->partition_size,
721 res_setup->classifications, res_setup->classbook);
722
723 for (j = 0; j < res_setup->classifications; ++j) {
724 high_bits = 0;
725 low_bits = get_bits(gb, 3);
726 if (get_bits1(gb))
727 high_bits = get_bits(gb, 5);
728 cascade[j] = (high_bits << 3) + low_bits;
729
730 ff_dlog(NULL, " %u class cascade depth: %d\n", j, ilog(cascade[j]));
731 }
732
733 res_setup->maxpass = 0;
734 for (j = 0; j < res_setup->classifications; ++j) {
735 for (k = 0; k < 8; ++k) {
736 if (cascade[j]&(1 << k)) {
737 GET_VALIDATED_INDEX(res_setup->books[j][k], 8, vc->codebook_count)
738
739 ff_dlog(NULL, " %u class cascade depth %u book: %d\n",
740 j, k, res_setup->books[j][k]);
741
742 if (k>res_setup->maxpass)
743 res_setup->maxpass = k;
744 } else {
745 res_setup->books[j][k] = -1;
746 }
747 }
748 }
749 }
750 return 0;
751 }
752
753 // Process mappings part
754
755 static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc)
756 {
757 GetBitContext *gb = &vc->gb;
758 unsigned i, j;
759
760 vc->mapping_count = get_bits(gb, 6)+1;
761 vc->mappings = av_mallocz(vc->mapping_count * sizeof(*vc->mappings));
762 if (!vc->mappings)
763 return AVERROR(ENOMEM);
764
765 ff_dlog(NULL, " There are %d mappings. \n", vc->mapping_count);
766
767 for (i = 0; i < vc->mapping_count; ++i) {
768 vorbis_mapping *mapping_setup = &vc->mappings[i];
769
770 if (get_bits(gb, 16)) {
771 av_log(vc->avctx, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n");
772 return AVERROR_INVALIDDATA;
773 }
774 if (get_bits1(gb)) {
775 mapping_setup->submaps = get_bits(gb, 4) + 1;
776 } else {
777 mapping_setup->submaps = 1;
778 }
779
780 if (get_bits1(gb)) {
781 mapping_setup->coupling_steps = get_bits(gb, 8) + 1;
782 mapping_setup->magnitude = av_mallocz(mapping_setup->coupling_steps *
783 sizeof(*mapping_setup->magnitude));
784 mapping_setup->angle = av_mallocz(mapping_setup->coupling_steps *
785 sizeof(*mapping_setup->angle));
786 if (!mapping_setup->angle || !mapping_setup->magnitude)
787 return AVERROR(ENOMEM);
788
789 for (j = 0; j < mapping_setup->coupling_steps; ++j) {
790 GET_VALIDATED_INDEX(mapping_setup->magnitude[j], ilog(vc->audio_channels - 1), vc->audio_channels)
791 GET_VALIDATED_INDEX(mapping_setup->angle[j], ilog(vc->audio_channels - 1), vc->audio_channels)
792 }
793 } else {
794 mapping_setup->coupling_steps = 0;
795 }
796
797 ff_dlog(NULL, " %u mapping coupling steps: %d\n",
798 i, mapping_setup->coupling_steps);
799
800 if (get_bits(gb, 2)) {
801 av_log(vc->avctx, AV_LOG_ERROR, "%u. mapping setup data invalid.\n", i);
802 return AVERROR_INVALIDDATA; // following spec.
803 }
804
805 if (mapping_setup->submaps>1) {
806 mapping_setup->mux = av_mallocz(vc->audio_channels *
807 sizeof(*mapping_setup->mux));
808 if (!mapping_setup->mux)
809 return AVERROR(ENOMEM);
810
811 for (j = 0; j < vc->audio_channels; ++j)
812 mapping_setup->mux[j] = get_bits(gb, 4);
813 }
814
815 for (j = 0; j < mapping_setup->submaps; ++j) {
816 skip_bits(gb, 8); // FIXME check?
817 GET_VALIDATED_INDEX(mapping_setup->submap_floor[j], 8, vc->floor_count)
818 GET_VALIDATED_INDEX(mapping_setup->submap_residue[j], 8, vc->residue_count)
819
820 ff_dlog(NULL, " %u mapping %u submap : floor %d, residue %d\n", i, j,
821 mapping_setup->submap_floor[j],
822 mapping_setup->submap_residue[j]);
823 }
824 }
825 return 0;
826 }
827
828 // Process modes part
829
830 static int create_map(vorbis_context *vc, unsigned floor_number)
831 {
832 vorbis_floor *floors = vc->floors;
833 vorbis_floor0 *vf;
834 int idx;
835 int blockflag, n;
836 int32_t *map;
837
838 for (blockflag = 0; blockflag < 2; ++blockflag) {
839 n = vc->blocksize[blockflag] / 2;
840 floors[floor_number].data.t0.map[blockflag] =
841 av_malloc((n + 1) * sizeof(int32_t)); // n + sentinel
842 if (!floors[floor_number].data.t0.map[blockflag])
843 return AVERROR(ENOMEM);
844
845 map = floors[floor_number].data.t0.map[blockflag];
846 vf = &floors[floor_number].data.t0;
847
848 for (idx = 0; idx < n; ++idx) {
849 map[idx] = floor(BARK((vf->rate * idx) / (2.0f * n)) *
850 (vf->bark_map_size / BARK(vf->rate / 2.0f)));
851 if (vf->bark_map_size-1 < map[idx])
852 map[idx] = vf->bark_map_size - 1;
853 }
854 map[n] = -1;
855 vf->map_size[blockflag] = n;
856 }
857
858 for (idx = 0; idx <= n; ++idx) {
859 ff_dlog(NULL, "floor0 map: map at pos %d is %"PRId32"\n", idx, map[idx]);
860 }
861
862 return 0;
863 }
864
865 static int vorbis_parse_setup_hdr_modes(vorbis_context *vc)
866 {
867 GetBitContext *gb = &vc->gb;
868 unsigned i;
869
870 vc->mode_count = get_bits(gb, 6) + 1;
871 vc->modes = av_mallocz(vc->mode_count * sizeof(*vc->modes));
872 if (!vc->modes)
873 return AVERROR(ENOMEM);
874
875 ff_dlog(NULL, " There are %d modes.\n", vc->mode_count);
876
877 for (i = 0; i < vc->mode_count; ++i) {
878 vorbis_mode *mode_setup = &vc->modes[i];
879
880 mode_setup->blockflag = get_bits1(gb);
881 mode_setup->windowtype = get_bits(gb, 16); //FIXME check
882 mode_setup->transformtype = get_bits(gb, 16); //FIXME check
883 GET_VALIDATED_INDEX(mode_setup->mapping, 8, vc->mapping_count);
884
885 ff_dlog(NULL, " %u mode: blockflag %d, windowtype %d, transformtype %d, mapping %d\n",
886 i, mode_setup->blockflag, mode_setup->windowtype,
887 mode_setup->transformtype, mode_setup->mapping);
888 }
889 return 0;
890 }
891
892 // Process the whole setup header using the functions above
893
894 static int vorbis_parse_setup_hdr(vorbis_context *vc)
895 {
896 GetBitContext *gb = &vc->gb;
897 int ret;
898
899 if ((get_bits(gb, 8) != 'v') || (get_bits(gb, 8) != 'o') ||
900 (get_bits(gb, 8) != 'r') || (get_bits(gb, 8) != 'b') ||
901 (get_bits(gb, 8) != 'i') || (get_bits(gb, 8) != 's')) {
902 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n");
903 return AVERROR_INVALIDDATA;
904 }
905
906 if ((ret = vorbis_parse_setup_hdr_codebooks(vc))) {
907 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n");
908 return ret;
909 }
910 if ((ret = vorbis_parse_setup_hdr_tdtransforms(vc))) {
911 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n");
912 return ret;
913 }
914 if ((ret = vorbis_parse_setup_hdr_floors(vc))) {
915 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n");
916 return ret;
917 }
918 if ((ret = vorbis_parse_setup_hdr_residues(vc))) {
919 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n");
920 return ret;
921 }
922 if ((ret = vorbis_parse_setup_hdr_mappings(vc))) {
923 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n");
924 return ret;
925 }
926 if ((ret = vorbis_parse_setup_hdr_modes(vc))) {
927 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n");
928 return ret;
929 }
930 if (!get_bits1(gb)) {
931 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n");
932 return AVERROR_INVALIDDATA; // framing flag bit unset error
933 }
934
935 return 0;
936 }
937
938 // Process the identification header
939
940 static int vorbis_parse_id_hdr(vorbis_context *vc)
941 {
942 GetBitContext *gb = &vc->gb;
943 unsigned bl0, bl1;
944
945 if ((get_bits(gb, 8) != 'v') || (get_bits(gb, 8) != 'o') ||
946 (get_bits(gb, 8) != 'r') || (get_bits(gb, 8) != 'b') ||
947 (get_bits(gb, 8) != 'i') || (get_bits(gb, 8) != 's')) {
948 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n");
949 return AVERROR_INVALIDDATA;
950 }
951
952 vc->version = get_bits_long(gb, 32); //FIXME check 0
953 vc->audio_channels = get_bits(gb, 8);
954 if (vc->audio_channels <= 0) {
955 av_log(vc->avctx, AV_LOG_ERROR, "Invalid number of channels\n");
956 return AVERROR_INVALIDDATA;
957 }
958 vc->audio_samplerate = get_bits_long(gb, 32);
959 if (vc->audio_samplerate <= 0) {
960 av_log(vc->avctx, AV_LOG_ERROR, "Invalid samplerate\n");
961 return AVERROR_INVALIDDATA;
962 }
963 vc->bitrate_maximum = get_bits_long(gb, 32);
964 vc->bitrate_nominal = get_bits_long(gb, 32);
965 vc->bitrate_minimum = get_bits_long(gb, 32);
966 bl0 = get_bits(gb, 4);
967 bl1 = get_bits(gb, 4);
968 vc->blocksize[0] = (1 << bl0);
969 vc->blocksize[1] = (1 << bl1);
970 if (bl0 > 13 || bl0 < 6 || bl1 > 13 || bl1 < 6 || bl1 < bl0) {
971 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n");
972 return AVERROR_INVALIDDATA;
973 }
974 vc->win[0] = ff_vorbis_vwin[bl0 - 6];
975 vc->win[1] = ff_vorbis_vwin[bl1 - 6];
976
977 if ((get_bits1(gb)) == 0) {
978 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n");
979 return AVERROR_INVALIDDATA;
980 }
981
982 vc->channel_residues = av_malloc((vc->blocksize[1] / 2) * vc->audio_channels * sizeof(*vc->channel_residues));
983 vc->saved = av_mallocz((vc->blocksize[1] / 4) * vc->audio_channels * sizeof(*vc->saved));
984 if (!vc->channel_residues || !vc->saved)
985 return AVERROR(ENOMEM);
986
987 vc->previous_window = 0;
988
989 ff_mdct_init(&vc->mdct[0], bl0, 1, -1.0);
990 ff_mdct_init(&vc->mdct[1], bl1, 1, -1.0);
991
992 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 ",
993 vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize[0], vc->blocksize[1]);
994
995 /*
996 BLK = vc->blocksize[0];
997 for (i = 0; i < BLK / 2; ++i) {
998 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)));
999 }
1000 */
1001
1002 return 0;
1003 }
1004
1005 // Process the extradata using the functions above (identification header, setup header)
1006
1007 static av_cold int vorbis_decode_init(AVCodecContext *avctx)
1008 {
1009 vorbis_context *vc = avctx->priv_data;
1010 uint8_t *headers = avctx->extradata;
1011 int headers_len = avctx->extradata_size;
1012 uint8_t *header_start[3];
1013 int header_len[3];
1014 GetBitContext *gb = &vc->gb;
1015 int hdr_type, ret;
1016
1017 vc->avctx = avctx;
1018 ff_vorbisdsp_init(&vc->dsp);
1019 avpriv_float_dsp_init(&vc->fdsp, avctx->flags & AV_CODEC_FLAG_BITEXACT);
1020
1021 avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
1022
1023 if (!headers_len) {
1024 av_log(avctx, AV_LOG_ERROR, "Extradata missing.\n");
1025 return AVERROR_INVALIDDATA;
1026 }
1027
1028 if ((ret = avpriv_split_xiph_headers(headers, headers_len, 30, header_start, header_len)) < 0) {
1029 av_log(avctx, AV_LOG_ERROR, "Extradata corrupt.\n");
1030 return ret;
1031 }
1032
1033 init_get_bits(gb, header_start[0], header_len[0]*8);
1034 hdr_type = get_bits(gb, 8);
1035 if (hdr_type != 1) {
1036 av_log(avctx, AV_LOG_ERROR, "First header is not the id header.\n");
1037 return AVERROR_INVALIDDATA;
1038 }
1039 if ((ret = vorbis_parse_id_hdr(vc))) {
1040 av_log(avctx, AV_LOG_ERROR, "Id header corrupt.\n");
1041 vorbis_free(vc);
1042 return ret;
1043 }
1044
1045 init_get_bits(gb, header_start[2], header_len[2]*8);
1046 hdr_type = get_bits(gb, 8);
1047 if (hdr_type != 5) {
1048 av_log(avctx, AV_LOG_ERROR, "Third header is not the setup header.\n");
1049 vorbis_free(vc);
1050 return AVERROR_INVALIDDATA;
1051 }
1052 if ((ret = vorbis_parse_setup_hdr(vc))) {
1053 av_log(avctx, AV_LOG_ERROR, "Setup header corrupt.\n");
1054 vorbis_free(vc);
1055 return ret;
1056 }
1057
1058 if (vc->audio_channels > 8)
1059 avctx->channel_layout = 0;
1060 else
1061 avctx->channel_layout = ff_vorbis_channel_layouts[vc->audio_channels - 1];
1062
1063 avctx->channels = vc->audio_channels;
1064 avctx->sample_rate = vc->audio_samplerate;
1065
1066 return 0;
1067 }
1068
1069 // Decode audiopackets -------------------------------------------------
1070
1071 // Read and decode floor
1072
1073 static int vorbis_floor0_decode(vorbis_context *vc,
1074 vorbis_floor_data *vfu, float *vec)
1075 {
1076 vorbis_floor0 *vf = &vfu->t0;
1077 float *lsp = vf->lsp;
1078 unsigned amplitude, book_idx;
1079 unsigned blockflag = vc->modes[vc->mode_number].blockflag;
1080
1081 if (!vf->amplitude_bits)
1082 return 1;
1083
1084 amplitude = get_bits(&vc->gb, vf->amplitude_bits);
1085 if (amplitude > 0) {
1086 float last = 0;
1087 unsigned idx, lsp_len = 0;
1088 vorbis_codebook codebook;
1089
1090 book_idx = get_bits(&vc->gb, ilog(vf->num_books));
1091 if (book_idx >= vf->num_books) {
1092 av_log(vc->avctx, AV_LOG_ERROR, "floor0 dec: booknumber too high!\n");
1093 book_idx = 0;
1094 }
1095 ff_dlog(NULL, "floor0 dec: booknumber: %u\n", book_idx);
1096 codebook = vc->codebooks[vf->book_list[book_idx]];
1097 /* Invalid codebook! */
1098 if (!codebook.codevectors)
1099 return AVERROR_INVALIDDATA;
1100
1101 while (lsp_len<vf->order) {
1102 int vec_off;
1103
1104 ff_dlog(NULL, "floor0 dec: book dimension: %d\n", codebook.dimensions);
1105 ff_dlog(NULL, "floor0 dec: maximum depth: %d\n", codebook.maxdepth);
1106 /* read temp vector */
1107 vec_off = get_vlc2(&vc->gb, codebook.vlc.table,
1108 codebook.nb_bits, codebook.maxdepth)
1109 * codebook.dimensions;
1110 ff_dlog(NULL, "floor0 dec: vector offset: %d\n", vec_off);
1111 /* copy each vector component and add last to it */
1112 for (idx = 0; idx < codebook.dimensions; ++idx)
1113 lsp[lsp_len+idx] = codebook.codevectors[vec_off+idx] + last;
1114 last = lsp[lsp_len+idx-1]; /* set last to last vector component */
1115
1116 lsp_len += codebook.dimensions;
1117 }
1118 /* DEBUG: output lsp coeffs */
1119 {
1120 int idx;
1121 for (idx = 0; idx < lsp_len; ++idx)
1122 ff_dlog(NULL, "floor0 dec: coeff at %d is %f\n", idx, lsp[idx]);
1123 }
1124
1125 /* synthesize floor output vector */
1126 {
1127 int i;
1128 int order = vf->order;
1129 float wstep = M_PI / vf->bark_map_size;
1130
1131 for (i = 0; i < order; i++)
1132 lsp[i] = 2.0f * cos(lsp[i]);
1133
1134 ff_dlog(NULL, "floor0 synth: map_size = %"PRIu32"; m = %d; wstep = %f\n",
1135 vf->map_size[blockflag], order, wstep);
1136
1137 i = 0;
1138 while (i < vf->map_size[blockflag]) {
1139 int j, iter_cond = vf->map[blockflag][i];
1140 float p = 0.5f;
1141 float q = 0.5f;
1142 float two_cos_w = 2.0f * cos(wstep * iter_cond); // needed all times
1143
1144 /* similar part for the q and p products */
1145 for (j = 0; j + 1 < order; j += 2) {
1146 q *= lsp[j] - two_cos_w;
1147 p *= lsp[j + 1] - two_cos_w;
1148 }
1149 if (j == order) { // even order
1150 p *= p * (2.0f - two_cos_w);
1151 q *= q * (2.0f + two_cos_w);
1152 } else { // odd order
1153 q *= two_cos_w-lsp[j]; // one more time for q
1154
1155 /* final step and square */
1156 p *= p * (4.f - two_cos_w * two_cos_w);
1157 q *= q;
1158 }
1159
1160 /* calculate linear floor value */
1161 q = exp((((amplitude*vf->amplitude_offset) /
1162 (((1 << vf->amplitude_bits) - 1) * sqrt(p + q)))
1163 - vf->amplitude_offset) * .11512925f);
1164
1165 /* fill vector */
1166 do {
1167 vec[i] = q; ++i;
1168 } while (vf->map[blockflag][i] == iter_cond);
1169 }
1170 }
1171 } else {
1172 /* this channel is unused */
1173 return 1;
1174 }
1175
1176 ff_dlog(NULL, " Floor0 decoded\n");
1177
1178 return 0;
1179 }
1180
1181 static int vorbis_floor1_decode(vorbis_context *vc,
1182 vorbis_floor_data *vfu, float *vec)
1183 {
1184 vorbis_floor1 *vf = &vfu->t1;
1185 GetBitContext *gb = &vc->gb;
1186 uint16_t range_v[4] = { 256, 128, 86, 64 };
1187 unsigned range = range_v[vf->multiplier - 1];
1188 uint16_t floor1_Y[258];
1189 uint16_t floor1_Y_final[258];
1190 int floor1_flag[258];
1191 unsigned class, cdim, cbits, csub, cval, offset, i, j;
1192 int book, adx, ady, dy, off, predicted, err;
1193
1194
1195 if (!get_bits1(gb)) // silence
1196 return 1;
1197
1198 // Read values (or differences) for the floor's points
1199
1200 floor1_Y[0] = get_bits(gb, ilog(range - 1));
1201 floor1_Y[1] = get_bits(gb, ilog(range - 1));
1202
1203 ff_dlog(NULL, "floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);
1204
1205 offset = 2;
1206 for (i = 0; i < vf->partitions; ++i) {
1207 class = vf->partition_class[i];
1208 cdim = vf->class_dimensions[class];
1209 cbits = vf->class_subclasses[class];
1210 csub = (1 << cbits) - 1;
1211 cval = 0;
1212
1213 ff_dlog(NULL, "Cbits %u\n", cbits);
1214
1215 if (cbits) // this reads all subclasses for this partition's class
1216 cval = get_vlc2(gb, vc->codebooks[vf->class_masterbook[class]].vlc.table,
1217 vc->codebooks[vf->class_masterbook[class]].nb_bits, 3);
1218
1219 for (j = 0; j < cdim; ++j) {
1220 book = vf->subclass_books[class][cval & csub];
1221
1222 ff_dlog(NULL, "book %d Cbits %u cval %u bits:%d\n",
1223 book, cbits, cval, get_bits_count(gb));
1224
1225 cval = cval >> cbits;
1226 if (book > -1) {
1227 floor1_Y[offset+j] = get_vlc2(gb, vc->codebooks[book].vlc.table,
1228 vc->codebooks[book].nb_bits, 3);
1229 } else {
1230 floor1_Y[offset+j] = 0;
1231 }
1232
1233 ff_dlog(NULL, " floor(%d) = %d \n",
1234 vf->list[offset+j].x, floor1_Y[offset+j]);
1235 }
1236 offset+=cdim;
1237 }
1238
1239 // Amplitude calculation from the differences
1240
1241 floor1_flag[0] = 1;
1242 floor1_flag[1] = 1;
1243 floor1_Y_final[0] = floor1_Y[0];
1244 floor1_Y_final[1] = floor1_Y[1];
1245
1246 for (i = 2; i < vf->x_list_dim; ++i) {
1247 unsigned val, highroom, lowroom, room, high_neigh_offs, low_neigh_offs;
1248
1249 low_neigh_offs = vf->list[i].low;
1250 high_neigh_offs = vf->list[i].high;
1251 dy = floor1_Y_final[high_neigh_offs] - floor1_Y_final[low_neigh_offs]; // render_point begin
1252 adx = vf->list[high_neigh_offs].x - vf->list[low_neigh_offs].x;
1253 ady = FFABS(dy);
1254 err = ady * (vf->list[i].x - vf->list[low_neigh_offs].x);
1255 off = err / adx;
1256 if (dy < 0) {
1257 predicted = floor1_Y_final[low_neigh_offs] - off;
1258 } else {
1259 predicted = floor1_Y_final[low_neigh_offs] + off;
1260 } // render_point end
1261
1262 val = floor1_Y[i];
1263 highroom = range-predicted;
1264 lowroom = predicted;
1265 if (highroom < lowroom) {
1266 room = highroom * 2;
1267 } else {
1268 room = lowroom * 2; // SPEC misspelling
1269 }
1270 if (val) {
1271 floor1_flag[low_neigh_offs] = 1;
1272 floor1_flag[high_neigh_offs] = 1;
1273 floor1_flag[i] = 1;
1274 if (val >= room) {
1275 if (highroom > lowroom) {
1276 floor1_Y_final[i] = av_clip_uint16(val - lowroom + predicted);
1277 } else {
1278 floor1_Y_final[i] = av_clip_uint16(predicted - val + highroom - 1);
1279 }
1280 } else {
1281 if (val & 1) {
1282 floor1_Y_final[i] = av_clip_uint16(predicted - (val + 1) / 2);
1283 } else {
1284 floor1_Y_final[i] = av_clip_uint16(predicted + val / 2);
1285 }
1286 }
1287 } else {
1288 floor1_flag[i] = 0;
1289 floor1_Y_final[i] = av_clip_uint16(predicted);
1290 }
1291
1292 ff_dlog(NULL, " Decoded floor(%d) = %u / val %u\n",
1293 vf->list[i].x, floor1_Y_final[i], val);
1294 }
1295
1296 // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?
1297
1298 ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);
1299
1300 ff_dlog(NULL, " Floor decoded\n");
1301
1302 return 0;
1303 }
1304
1305 static av_always_inline int setup_classifs(vorbis_context *vc,
1306 vorbis_residue *vr,
1307 uint8_t *do_not_decode,
1308 unsigned ch_used,
1309 int partition_count)
1310 {
1311 vorbis_codebook *codebook = vc->codebooks + vr->classbook;
1312 int p, j, i;
1313 unsigned c_p_c = codebook->dimensions;
1314 unsigned inverse_class = ff_inverse[vr->classifications];
1315 int temp, temp2;
1316 for (p = 0, j = 0; j < ch_used; ++j) {
1317 if (!do_not_decode[j]) {
1318 temp = get_vlc2(&vc->gb, codebook->vlc.table,
1319 codebook->nb_bits, 3);
1320
1321 ff_dlog(NULL, "Classword: %u\n", temp);
1322
1323 if (temp < 0) {
1324 av_log(vc->avctx, AV_LOG_ERROR,
1325 "Invalid vlc code decoding %d channel.", j);
1326 return AVERROR_INVALIDDATA;
1327 }
1328
1329 for (i = partition_count + c_p_c - 1; i >= partition_count; i--) {
1330 temp2 = (((uint64_t)temp) * inverse_class) >> 32;
1331
1332 if (i < vr->ptns_to_read)
1333 vr->classifs[p + i] = temp - temp2 * vr->classifications;
1334 temp = temp2;
1335 }
1336 }
1337 p += vr->ptns_to_read;
1338 }
1339 return 0;
1340 }
1341 // Read and decode residue
1342
1343 static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc,
1344 vorbis_residue *vr,
1345 unsigned ch,
1346 uint8_t *do_not_decode,
1347 float *vec,
1348 unsigned vlen,
1349 unsigned ch_left,
1350 int vr_type)
1351 {
1352 GetBitContext *gb = &vc->gb;
1353 unsigned c_p_c = vc->codebooks[vr->classbook].dimensions;
1354 uint8_t *classifs = vr->classifs;
1355 unsigned pass, ch_used, i, j, k, l;
1356 unsigned max_output = (ch - 1) * vlen;
1357 int ptns_to_read = vr->ptns_to_read;
1358
1359 if (vr_type == 2) {
1360 for (j = 1; j < ch; ++j)
1361 do_not_decode[0] &= do_not_decode[j]; // FIXME - clobbering input
1362 if (do_not_decode[0])
1363 return 0;
1364 ch_used = 1;
1365 max_output += vr->end / ch;
1366 } else {
1367 ch_used = ch;
1368 max_output += vr->end;
1369 }
1370
1371 if (max_output > ch_left * vlen) {
1372 av_log(vc->avctx, AV_LOG_ERROR, "Insufficient output buffer\n");
1373 return AVERROR_INVALIDDATA;
1374 }
1375
1376 ff_dlog(NULL, " residue type 0/1/2 decode begin, ch: %d cpc %d \n", ch, c_p_c);
1377
1378 for (pass = 0; pass <= vr->maxpass; ++pass) { // FIXME OPTIMIZE?
1379 int voffset, partition_count, j_times_ptns_to_read;
1380
1381 voffset = vr->begin;
1382 for (partition_count = 0; partition_count < ptns_to_read;) { // SPEC error
1383 if (!pass) {
1384 int ret = setup_classifs(vc, vr, do_not_decode, ch_used, partition_count);
1385 if (ret < 0)
1386 return ret;
1387 }
1388 for (i = 0; (i < c_p_c) && (partition_count < ptns_to_read); ++i) {
1389 for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {
1390 unsigned voffs;
1391
1392 if (!do_not_decode[j]) {
1393 unsigned vqclass = classifs[j_times_ptns_to_read + partition_count];
1394 int vqbook = vr->books[vqclass][pass];
1395
1396 if (vqbook >= 0 && vc->codebooks[vqbook].codevectors) {
1397 unsigned coffs;
1398 unsigned dim = vc->codebooks[vqbook].dimensions;
1399 unsigned step = FASTDIV(vr->partition_size << 1, dim << 1);
1400 vorbis_codebook codebook = vc->codebooks[vqbook];
1401
1402 if (vr_type == 0) {
1403
1404 voffs = voffset+j*vlen;
1405 for (k = 0; k < step; ++k) {
1406 coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1407 for (l = 0; l < dim; ++l)
1408 vec[voffs + k + l * step] += codebook.codevectors[coffs + l];
1409 }
1410 } else if (vr_type == 1) {
1411 voffs = voffset + j * vlen;
1412 for (k = 0; k < step; ++k) {
1413 coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1414 for (l = 0; l < dim; ++l, ++voffs) {
1415 vec[voffs]+=codebook.codevectors[coffs+l];
1416
1417 ff_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d \n",
1418 pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);
1419 }
1420 }
1421 } else if (vr_type == 2 && ch == 2 && (voffset & 1) == 0 && (dim & 1) == 0) { // most frequent case optimized
1422 voffs = voffset >> 1;
1423
1424 if (dim == 2) {
1425 for (k = 0; k < step; ++k) {
1426 coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;
1427 vec[voffs + k ] += codebook.codevectors[coffs ];
1428 vec[voffs + k + vlen] += codebook.codevectors[coffs + 1];
1429 }
1430 } else if (dim == 4) {
1431 for (k = 0; k < step; ++k, voffs += 2) {
1432 coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4;
1433 vec[voffs ] += codebook.codevectors[coffs ];
1434 vec[voffs + 1 ] += codebook.codevectors[coffs + 2];
1435 vec[voffs + vlen ] += codebook.codevectors[coffs + 1];
1436 vec[voffs + vlen + 1] += codebook.codevectors[coffs + 3];
1437 }
1438 } else
1439 for (k = 0; k < step; ++k) {
1440 coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1441 for (l = 0; l < dim; l += 2, voffs++) {
1442 vec[voffs ] += codebook.codevectors[coffs + l ];
1443 vec[voffs + vlen] += codebook.codevectors[coffs + l + 1];
1444
1445 ff_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d+%d \n",
1446 pass, voffset / ch + (voffs % ch) * vlen,
1447 vec[voffset / ch + (voffs % ch) * vlen],
1448 codebook.codevectors[coffs + l], coffs, l);
1449 }
1450 }
1451
1452 } else if (vr_type == 2) {
1453 unsigned voffs_div = FASTDIV(voffset << 1, ch <<1);
1454 unsigned voffs_mod = voffset - voffs_div * ch;
1455
1456 for (k = 0; k < step; ++k) {
1457 coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1458 for (l = 0; l < dim; ++l) {
1459 vec[voffs_div + voffs_mod * vlen] +=
1460 codebook.codevectors[coffs + l];
1461
1462 ff_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d+%d \n",
1463 pass, voffs_div + voffs_mod * vlen,
1464 vec[voffs_div + voffs_mod * vlen],
1465 codebook.codevectors[coffs + l], coffs, l);
1466
1467 if (++voffs_mod == ch) {
1468 voffs_div++;
1469 voffs_mod = 0;
1470 }
1471 }
1472 }
1473 }
1474 }
1475 }
1476 j_times_ptns_to_read += ptns_to_read;
1477 }
1478 ++partition_count;
1479 voffset += vr->partition_size;
1480 }
1481 }
1482 }
1483 return 0;
1484 }
1485
1486 static inline int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr,
1487 unsigned ch,
1488 uint8_t *do_not_decode,
1489 float *vec, unsigned vlen,
1490 unsigned ch_left)
1491 {
1492 if (vr->type == 2)
1493 return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 2);
1494 else if (vr->type == 1)
1495 return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 1);
1496 else if (vr->type == 0)
1497 return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 0);
1498 else {
1499 av_log(vc->avctx, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");
1500 return AVERROR_INVALIDDATA;
1501 }
1502 }
1503
1504 void ff_vorbis_inverse_coupling(float *mag, float *ang, intptr_t blocksize)
1505 {
1506 int i;
1507 for (i = 0; i < blocksize; i++) {
1508 if (mag[i] > 0.0) {
1509 if (ang[i] > 0.0) {
1510 ang[i] = mag[i] - ang[i];
1511 } else {
1512 float temp = ang[i];
1513 ang[i] = mag[i];
1514 mag[i] += temp;
1515 }
1516 } else {
1517 if (ang[i] > 0.0) {
1518 ang[i] += mag[i];
1519 } else {
1520 float temp = ang[i];
1521 ang[i] = mag[i];
1522 mag[i] -= temp;
1523 }
1524 }
1525 }
1526 }
1527
1528 // Decode the audio packet using the functions above
1529
1530 static int vorbis_parse_audio_packet(vorbis_context *vc, float **floor_ptr)
1531 {
1532 GetBitContext *gb = &vc->gb;
1533 FFTContext *mdct;
1534 unsigned previous_window = vc->previous_window;
1535 unsigned mode_number, blockflag, blocksize;
1536 int i, j;
1537 uint8_t no_residue[255];
1538 uint8_t do_not_decode[255];
1539 vorbis_mapping *mapping;
1540 float *ch_res_ptr = vc->channel_residues;
1541 uint8_t res_chan[255];
1542 unsigned res_num = 0;
1543 int retlen = 0;
1544 unsigned ch_left = vc->audio_channels;
1545 unsigned vlen;
1546
1547 if (get_bits1(gb)) {
1548 av_log(vc->avctx, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");
1549 return AVERROR_INVALIDDATA; // packet type not audio
1550 }
1551
1552 if (vc->mode_count == 1) {
1553 mode_number = 0;
1554 } else {
1555 GET_VALIDATED_INDEX(mode_number, ilog(vc->mode_count-1), vc->mode_count)
1556 }
1557 vc->mode_number = mode_number;
1558 mapping = &vc->mappings[vc->modes[mode_number].mapping];
1559
1560 ff_dlog(NULL, " Mode number: %u , mapping: %d , blocktype %d\n", mode_number,
1561 vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);
1562
1563 blockflag = vc->modes[mode_number].blockflag;
1564 blocksize = vc->blocksize[blockflag];
1565 vlen = blocksize / 2;
1566 if (blockflag) {
1567 previous_window = get_bits(gb, 1);
1568 skip_bits1(gb); // next_window
1569 }
1570
1571 memset(ch_res_ptr, 0, sizeof(float) * vc->audio_channels * vlen); //FIXME can this be removed ?
1572 for (i = 0; i < vc->audio_channels; ++i)
1573 memset(floor_ptr[i], 0, vlen * sizeof(floor_ptr[0][0])); //FIXME can this be removed ?
1574
1575 // Decode floor
1576
1577 for (i = 0; i < vc->audio_channels; ++i) {
1578 vorbis_floor *floor;
1579 int ret;
1580 if (mapping->submaps > 1) {
1581 floor = &vc->floors[mapping->submap_floor[mapping->mux[i]]];
1582 } else {
1583 floor = &vc->floors[mapping->submap_floor[0]];
1584 }
1585
1586 ret = floor->decode(vc, &floor->data, floor_ptr[i]);
1587
1588 if (ret < 0) {
1589 av_log(vc->avctx, AV_LOG_ERROR, "Invalid codebook in vorbis_floor_decode.\n");
1590 return AVERROR_INVALIDDATA;
1591 }
1592 no_residue[i] = ret;
1593 }
1594
1595 // Nonzero vector propagate
1596
1597 for (i = mapping->coupling_steps - 1; i >= 0; --i) {
1598 if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {
1599 no_residue[mapping->magnitude[i]] = 0;
1600 no_residue[mapping->angle[i]] = 0;
1601 }
1602 }
1603
1604 // Decode residue
1605
1606 for (i = 0; i < mapping->submaps; ++i) {
1607 vorbis_residue *residue;
1608 unsigned ch = 0;
1609 int ret;
1610
1611 for (j = 0; j < vc->audio_channels; ++j) {
1612 if ((mapping->submaps == 1) || (i == mapping->mux[j])) {
1613 res_chan[j] = res_num;
1614 if (no_residue[j]) {
1615 do_not_decode[ch] = 1;
1616 } else {
1617 do_not_decode[ch] = 0;
1618 }
1619 ++ch;
1620 ++res_num;
1621 }
1622 }
1623 residue = &vc->residues[mapping->submap_residue[i]];
1624 if (ch_left < ch) {
1625 av_log(vc->avctx, AV_LOG_ERROR, "Too many channels in vorbis_floor_decode.\n");
1626 return AVERROR_INVALIDDATA;
1627 }
1628 if (ch) {
1629 ret = vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, vlen, ch_left);
1630 if (ret < 0)
1631 return ret;
1632 }
1633
1634 ch_res_ptr += ch * vlen;
1635 ch_left -= ch;
1636 }
1637
1638 if (ch_left > 0)
1639 return AVERROR_INVALIDDATA;
1640
1641 // Inverse coupling
1642
1643 for (i = mapping->coupling_steps - 1; i >= 0; --i) { //warning: i has to be signed
1644 float *mag, *ang;
1645
1646 mag = vc->channel_residues+res_chan[mapping->magnitude[i]] * blocksize / 2;
1647 ang = vc->channel_residues+res_chan[mapping->angle[i]] * blocksize / 2;
1648 vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize / 2);
1649 }
1650
1651 // Dotproduct, MDCT
1652
1653 mdct = &vc->mdct[blockflag];
1654
1655 for (j = vc->audio_channels-1;j >= 0; j--) {
1656 ch_res_ptr = vc->channel_residues + res_chan[j] * blocksize / 2;
1657 vc->fdsp.vector_fmul(floor_ptr[j], floor_ptr[j], ch_res_ptr, blocksize / 2);
1658 mdct->imdct_half(mdct, ch_res_ptr, floor_ptr[j]);
1659 }
1660
1661 // Overlap/add, save data for next overlapping
1662
1663 retlen = (blocksize + vc->blocksize[previous_window]) / 4;
1664 for (j = 0; j < vc->audio_channels; j++) {
1665 unsigned bs0 = vc->blocksize[0];
1666 unsigned bs1 = vc->blocksize[1];
1667 float *residue = vc->channel_residues + res_chan[j] * blocksize / 2;
1668 float *saved = vc->saved + j * bs1 / 4;
1669 float *ret = floor_ptr[j];
1670 float *buf = residue;
1671 const float *win = vc->win[blockflag & previous_window];
1672
1673 if (blockflag == previous_window) {
1674 vc->fdsp.vector_fmul_window(ret, saved, buf, win, blocksize / 4);
1675 } else if (blockflag > previous_window) {
1676 vc->fdsp.vector_fmul_window(ret, saved, buf, win, bs0 / 4);
1677 memcpy(ret+bs0/2, buf+bs0/4, ((bs1-bs0)/4) * sizeof(float));
1678 } else {
1679 memcpy(ret, saved, ((bs1 - bs0) / 4) * sizeof(float));
1680 vc->fdsp.vector_fmul_window(ret + (bs1 - bs0) / 4, saved + (bs1 - bs0) / 4, buf, win, bs0 / 4);
1681 }
1682 memcpy(saved, buf + blocksize / 4, blocksize / 4 * sizeof(float));
1683 }
1684
1685 vc->previous_window = blockflag;
1686 return retlen;
1687 }
1688
1689 // Return the decoded audio packet through the standard api
1690
1691 static int vorbis_decode_frame(AVCodecContext *avctx, void *data,
1692 int *got_frame_ptr, AVPacket *avpkt)
1693 {
1694 const uint8_t *buf = avpkt->data;
1695 int buf_size = avpkt->size;
1696 vorbis_context *vc = avctx->priv_data;
1697 AVFrame *frame = data;
1698 GetBitContext *gb = &vc->gb;
1699 float *channel_ptrs[255];
1700 int i, len, ret;
1701
1702 ff_dlog(NULL, "packet length %d \n", buf_size);
1703
1704 /* get output buffer */
1705 frame->nb_samples = vc->blocksize[1] / 2;
1706 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
1707 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
1708 return ret;
1709 }
1710
1711 if (vc->audio_channels > 8) {
1712 for (i = 0; i < vc->audio_channels; i++)
1713 channel_ptrs[i] = (float *)frame->extended_data[i];
1714 } else {
1715 for (i = 0; i < vc->audio_channels; i++) {
1716 int ch = ff_vorbis_channel_layout_offsets[vc->audio_channels - 1][i];
1717 channel_ptrs[ch] = (float *)frame->extended_data[i];
1718 }
1719 }
1720
1721 init_get_bits(gb, buf, buf_size*8);
1722
1723 if ((len = vorbis_parse_audio_packet(vc, channel_ptrs)) <= 0)
1724 return len;
1725
1726 if (!vc->first_frame) {
1727 vc->first_frame = 1;
1728 *got_frame_ptr = 0;
1729 av_frame_unref(frame);
1730 return buf_size;
1731 }
1732
1733 ff_dlog(NULL, "parsed %d bytes %d bits, returned %d samples (*ch*bits) \n",
1734 get_bits_count(gb) / 8, get_bits_count(gb) % 8, len);
1735
1736 frame->nb_samples = len;
1737 *got_frame_ptr = 1;
1738
1739 return buf_size;
1740 }
1741
1742 // Close decoder
1743
1744 static av_cold int vorbis_decode_close(AVCodecContext *avctx)
1745 {
1746 vorbis_context *vc = avctx->priv_data;
1747
1748 vorbis_free(vc);
1749
1750 return 0;
1751 }
1752
1753 static av_cold void vorbis_decode_flush(AVCodecContext *avctx)
1754 {
1755 vorbis_context *vc = avctx->priv_data;
1756
1757 if (vc->saved) {
1758 memset(vc->saved, 0, (vc->blocksize[1] / 4) * vc->audio_channels *
1759 sizeof(*vc->saved));
1760 }
1761 vc->previous_window = 0;
1762 }
1763
1764 AVCodec ff_vorbis_decoder = {
1765 .name = "vorbis",
1766 .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),
1767 .type = AVMEDIA_TYPE_AUDIO,
1768 .id = AV_CODEC_ID_VORBIS,
1769 .priv_data_size = sizeof(vorbis_context),
1770 .init = vorbis_decode_init,
1771 .close = vorbis_decode_close,
1772 .decode = vorbis_decode_frame,
1773 .flush = vorbis_decode_flush,
1774 .capabilities = AV_CODEC_CAP_DR1,
1775 .channel_layouts = ff_vorbis_channel_layouts,
1776 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
1777 AV_SAMPLE_FMT_NONE },
1778 };
Modern FFMPEG