summaryrefslogtreecommitdiff
path: root/libavcodec/vorbisdec.c (plain)
blob: bc6c5875c2e80d3afc2fb244a955b138c8f0b130
1/**
2 * @file
3 * Vorbis I decoder
4 * @author Denes Balatoni ( dbalatoni programozo hu )
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23/**
24 * @file
25 * Vorbis I decoder
26 * @author Denes Balatoni ( dbalatoni programozo hu )
27 */
28
29#include <inttypes.h>
30#include <math.h>
31
32#include "libavutil/avassert.h"
33#include "libavutil/float_dsp.h"
34
35#define BITSTREAM_READER_LE
36#include "avcodec.h"
37#include "fft.h"
38#include "get_bits.h"
39#include "internal.h"
40#include "vorbis.h"
41#include "vorbisdsp.h"
42#include "xiph.h"
43
44#define V_NB_BITS 8
45#define V_NB_BITS2 11
46#define V_MAX_VLCS (1 << 16)
47#define V_MAX_PARTITIONS (1 << 20)
48
49typedef struct vorbis_codebook {
50 uint8_t dimensions;
51 uint8_t lookup_type;
52 uint8_t maxdepth;
53 VLC vlc;
54 float *codevectors;
55 unsigned int nb_bits;
56} vorbis_codebook;
57
58typedef union vorbis_floor_u vorbis_floor_data;
59typedef struct vorbis_floor0_s vorbis_floor0;
60typedef struct vorbis_floor1_s vorbis_floor1;
61struct vorbis_context_s;
62typedef
63int (* vorbis_floor_decode_func)
64 (struct vorbis_context_s *, vorbis_floor_data *, float *);
65typedef struct vorbis_floor {
66 uint8_t floor_type;
67 vorbis_floor_decode_func decode;
68 union vorbis_floor_u {
69 struct vorbis_floor0_s {
70 uint8_t order;
71 uint16_t rate;
72 uint16_t bark_map_size;
73 int32_t *map[2];
74 uint32_t map_size[2];
75 uint8_t amplitude_bits;
76 uint8_t amplitude_offset;
77 uint8_t num_books;
78 uint8_t *book_list;
79 float *lsp;
80 } t0;
81 struct vorbis_floor1_s {
82 uint8_t partitions;
83 uint8_t partition_class[32];
84 uint8_t class_dimensions[16];
85 uint8_t class_subclasses[16];
86 uint8_t class_masterbook[16];
87 int16_t subclass_books[16][8];
88 uint8_t multiplier;
89 uint16_t x_list_dim;
90 vorbis_floor1_entry *list;
91 } t1;
92 } data;
93} vorbis_floor;
94
95typedef struct vorbis_residue {
96 uint16_t type;
97 uint32_t begin;
98 uint32_t end;
99 unsigned partition_size;
100 uint8_t classifications;
101 uint8_t classbook;
102 int16_t books[64][8];
103 uint8_t maxpass;
104 uint16_t ptns_to_read;
105 uint8_t *classifs;
106} vorbis_residue;
107
108typedef struct vorbis_mapping {
109 uint8_t submaps;
110 uint16_t coupling_steps;
111 uint8_t *magnitude;
112 uint8_t *angle;
113 uint8_t *mux;
114 uint8_t submap_floor[16];
115 uint8_t submap_residue[16];
116} vorbis_mapping;
117
118typedef struct vorbis_mode {
119 uint8_t blockflag;
120 uint16_t windowtype;
121 uint16_t transformtype;
122 uint8_t mapping;
123} vorbis_mode;
124
125typedef struct vorbis_context_s {
126 AVCodecContext *avctx;
127 GetBitContext gb;
128 VorbisDSPContext dsp;
129 AVFloatDSPContext *fdsp;
130
131 FFTContext mdct[2];
132 uint8_t first_frame;
133 uint32_t version;
134 uint8_t audio_channels;
135 uint32_t audio_samplerate;
136 uint32_t bitrate_maximum;
137 uint32_t bitrate_nominal;
138 uint32_t bitrate_minimum;
139 uint32_t blocksize[2];
140 const float *win[2];
141 uint16_t codebook_count;
142 vorbis_codebook *codebooks;
143 uint8_t floor_count;
144 vorbis_floor *floors;
145 uint8_t residue_count;
146 vorbis_residue *residues;
147 uint8_t mapping_count;
148 vorbis_mapping *mappings;
149 uint8_t mode_count;
150 vorbis_mode *modes;
151 uint8_t mode_number; // mode number for the current packet
152 int8_t previous_window;
153 float *channel_residues;
154 float *saved;
155} vorbis_context;
156
157/* Helper functions */
158
159#define BARK(x) \
160 (13.1f * atan(0.00074f * (x)) + 2.24f * atan(1.85e-8f * (x) * (x)) + 1e-4f * (x))
161
162static const char idx_err_str[] = "Index value %d out of range (0 - %d) for %s at %s:%i\n";
163#define VALIDATE_INDEX(idx, limit) \
164 if (idx >= limit) {\
165 av_log(vc->avctx, AV_LOG_ERROR,\
166 idx_err_str,\
167 (int)(idx), (int)(limit - 1), #idx, __FILE__, __LINE__);\
168 return AVERROR_INVALIDDATA;\
169 }
170#define GET_VALIDATED_INDEX(idx, bits, limit) \
171 {\
172 idx = get_bits(gb, bits);\
173 VALIDATE_INDEX(idx, limit)\
174 }
175
176static float vorbisfloat2float(unsigned val)
177{
178 double mant = val & 0x1fffff;
179 long exp = (val & 0x7fe00000L) >> 21;
180 if (val & 0x80000000)
181 mant = -mant;
182 return ldexp(mant, exp - 20 - 768);
183}
184
185
186// Free all allocated memory -----------------------------------------
187
188static void vorbis_free(vorbis_context *vc)
189{
190 int i;
191
192 av_freep(&vc->channel_residues);
193 av_freep(&vc->saved);
194 av_freep(&vc->fdsp);
195
196 if (vc->residues)
197 for (i = 0; i < vc->residue_count; i++)
198 av_freep(&vc->residues[i].classifs);
199 av_freep(&vc->residues);
200 av_freep(&vc->modes);
201
202 ff_mdct_end(&vc->mdct[0]);
203 ff_mdct_end(&vc->mdct[1]);
204
205 if (vc->codebooks)
206 for (i = 0; i < vc->codebook_count; ++i) {
207 av_freep(&vc->codebooks[i].codevectors);
208 ff_free_vlc(&vc->codebooks[i].vlc);
209 }
210 av_freep(&vc->codebooks);
211
212 if (vc->floors)
213 for (i = 0; i < vc->floor_count; ++i) {
214 if (vc->floors[i].floor_type == 0) {
215 av_freep(&vc->floors[i].data.t0.map[0]);
216 av_freep(&vc->floors[i].data.t0.map[1]);
217 av_freep(&vc->floors[i].data.t0.book_list);
218 av_freep(&vc->floors[i].data.t0.lsp);
219 } else {
220 av_freep(&vc->floors[i].data.t1.list);
221 }
222 }
223 av_freep(&vc->floors);
224
225 if (vc->mappings)
226 for (i = 0; i < vc->mapping_count; ++i) {
227 av_freep(&vc->mappings[i].magnitude);
228 av_freep(&vc->mappings[i].angle);
229 av_freep(&vc->mappings[i].mux);
230 }
231 av_freep(&vc->mappings);
232}
233
234// Parse setup header -------------------------------------------------
235
236// Process codebooks part
237
238static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc)
239{
240 unsigned cb;
241 uint8_t *tmp_vlc_bits = NULL;
242 uint32_t *tmp_vlc_codes = NULL;
243 GetBitContext *gb = &vc->gb;
244 uint16_t *codebook_multiplicands = NULL;
245 int ret = 0;
246
247 vc->codebook_count = get_bits(gb, 8) + 1;
248
249 ff_dlog(NULL, " Codebooks: %d \n", vc->codebook_count);
250
251 vc->codebooks = av_mallocz(vc->codebook_count * sizeof(*vc->codebooks));
252 tmp_vlc_bits = av_mallocz(V_MAX_VLCS * sizeof(*tmp_vlc_bits));
253 tmp_vlc_codes = av_mallocz(V_MAX_VLCS * sizeof(*tmp_vlc_codes));
254 codebook_multiplicands = av_malloc(V_MAX_VLCS * sizeof(*codebook_multiplicands));
255 if (!vc->codebooks ||
256 !tmp_vlc_bits || !tmp_vlc_codes || !codebook_multiplicands) {
257 ret = AVERROR(ENOMEM);
258 goto error;
259 }
260
261 for (cb = 0; cb < vc->codebook_count; ++cb) {
262 vorbis_codebook *codebook_setup = &vc->codebooks[cb];
263 unsigned ordered, t, entries, used_entries = 0;
264
265 ff_dlog(NULL, " %u. Codebook\n", cb);
266
267 if (get_bits(gb, 24) != 0x564342) {
268 av_log(vc->avctx, AV_LOG_ERROR,
269 " %u. Codebook setup data corrupt.\n", cb);
270 ret = AVERROR_INVALIDDATA;
271 goto error;
272 }
273
274 codebook_setup->dimensions=get_bits(gb, 16);
275 if (codebook_setup->dimensions > 16 || codebook_setup->dimensions == 0) {
276 av_log(vc->avctx, AV_LOG_ERROR,
277 " %u. Codebook's dimension is invalid (%d).\n",
278 cb, codebook_setup->dimensions);
279 ret = AVERROR_INVALIDDATA;
280 goto error;
281 }
282 entries = get_bits(gb, 24);
283 if (entries > V_MAX_VLCS) {
284 av_log(vc->avctx, AV_LOG_ERROR,
285 " %u. Codebook has too many entries (%u).\n",
286 cb, entries);
287 ret = AVERROR_INVALIDDATA;
288 goto error;
289 }
290
291 ordered = get_bits1(gb);
292
293 ff_dlog(NULL, " codebook_dimensions %d, codebook_entries %u\n",
294 codebook_setup->dimensions, entries);
295
296 if (!ordered) {
297 unsigned ce, flag;
298 unsigned sparse = get_bits1(gb);
299
300 ff_dlog(NULL, " not ordered \n");
301
302 if (sparse) {
303 ff_dlog(NULL, " sparse \n");
304
305 used_entries = 0;
306 for (ce = 0; ce < entries; ++ce) {
307 flag = get_bits1(gb);
308 if (flag) {
309 tmp_vlc_bits[ce] = get_bits(gb, 5) + 1;
310 ++used_entries;
311 } else
312 tmp_vlc_bits[ce] = 0;
313 }
314 } else {
315 ff_dlog(NULL, " not sparse \n");
316
317 used_entries = entries;
318 for (ce = 0; ce < entries; ++ce)
319 tmp_vlc_bits[ce] = get_bits(gb, 5) + 1;
320 }
321 } else {
322 unsigned current_entry = 0;
323 unsigned current_length = get_bits(gb, 5) + 1;
324
325 ff_dlog(NULL, " ordered, current length: %u\n", current_length); //FIXME
326
327 used_entries = entries;
328 for (; current_entry < used_entries && current_length <= 32; ++current_length) {
329 unsigned i, number;
330
331 ff_dlog(NULL, " number bits: %u ", ilog(entries - current_entry));
332
333 number = get_bits(gb, ilog(entries - current_entry));
334
335 ff_dlog(NULL, " number: %u\n", number);
336
337 for (i = current_entry; i < number+current_entry; ++i)
338 if (i < used_entries)
339 tmp_vlc_bits[i] = current_length;
340
341 current_entry+=number;
342 }
343 if (current_entry>used_entries) {
344 av_log(vc->avctx, AV_LOG_ERROR, " More codelengths than codes in codebook. \n");
345 ret = AVERROR_INVALIDDATA;
346 goto error;
347 }
348 }
349
350 codebook_setup->lookup_type = get_bits(gb, 4);
351
352 ff_dlog(NULL, " lookup type: %d : %s \n", codebook_setup->lookup_type,
353 codebook_setup->lookup_type ? "vq" : "no lookup");
354
355// If the codebook is used for (inverse) VQ, calculate codevectors.
356
357 if (codebook_setup->lookup_type == 1) {
358 unsigned i, j, k;
359 unsigned codebook_lookup_values = ff_vorbis_nth_root(entries, codebook_setup->dimensions);
360
361 float codebook_minimum_value = vorbisfloat2float(get_bits_long(gb, 32));
362 float codebook_delta_value = vorbisfloat2float(get_bits_long(gb, 32));
363 unsigned codebook_value_bits = get_bits(gb, 4) + 1;
364 unsigned codebook_sequence_p = get_bits1(gb);
365
366 ff_dlog(NULL, " We expect %d numbers for building the codevectors. \n",
367 codebook_lookup_values);
368 ff_dlog(NULL, " delta %f minmum %f \n",
369 codebook_delta_value, codebook_minimum_value);
370
371 for (i = 0; i < codebook_lookup_values; ++i) {
372 codebook_multiplicands[i] = get_bits(gb, codebook_value_bits);
373
374 ff_dlog(NULL, " multiplicands*delta+minmum : %e \n",
375 (float)codebook_multiplicands[i] * codebook_delta_value + codebook_minimum_value);
376 ff_dlog(NULL, " multiplicand %u\n", codebook_multiplicands[i]);
377 }
378
379// Weed out unused vlcs and build codevector vector
380 if (used_entries) {
381 codebook_setup->codevectors =
382 av_mallocz_array(used_entries, codebook_setup->dimensions *
383 sizeof(*codebook_setup->codevectors));
384 if (!codebook_setup->codevectors) {
385 ret = AVERROR(ENOMEM);
386 goto error;
387 }
388 } else
389 codebook_setup->codevectors = NULL;
390
391 for (j = 0, i = 0; i < entries; ++i) {
392 unsigned dim = codebook_setup->dimensions;
393
394 if (tmp_vlc_bits[i]) {
395 float last = 0.0;
396 unsigned lookup_offset = i;
397
398 ff_dlog(vc->avctx, "Lookup offset %u ,", i);
399
400 for (k = 0; k < dim; ++k) {
401 unsigned multiplicand_offset = lookup_offset % codebook_lookup_values;
402 codebook_setup->codevectors[j * dim + k] = codebook_multiplicands[multiplicand_offset] * codebook_delta_value + codebook_minimum_value + last;
403 if (codebook_sequence_p)
404 last = codebook_setup->codevectors[j * dim + k];
405 lookup_offset/=codebook_lookup_values;
406 }
407 tmp_vlc_bits[j] = tmp_vlc_bits[i];
408
409 ff_dlog(vc->avctx, "real lookup offset %u, vector: ", j);
410 for (k = 0; k < dim; ++k)
411 ff_dlog(vc->avctx, " %f ",
412 codebook_setup->codevectors[j * dim + k]);
413 ff_dlog(vc->avctx, "\n");
414
415 ++j;
416 }
417 }
418 if (j != used_entries) {
419 av_log(vc->avctx, AV_LOG_ERROR, "Bug in codevector vector building code. \n");
420 ret = AVERROR_INVALIDDATA;
421 goto error;
422 }
423 entries = used_entries;
424 } else if (codebook_setup->lookup_type >= 2) {
425 av_log(vc->avctx, AV_LOG_ERROR, "Codebook lookup type not supported. \n");
426 ret = AVERROR_INVALIDDATA;
427 goto error;
428 }
429
430// Initialize VLC table
431 if (ff_vorbis_len2vlc(tmp_vlc_bits, tmp_vlc_codes, entries)) {
432 av_log(vc->avctx, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");
433 ret = AVERROR_INVALIDDATA;
434 goto error;
435 }
436 codebook_setup->maxdepth = 0;
437 for (t = 0; t < entries; ++t)
438 if (tmp_vlc_bits[t] >= codebook_setup->maxdepth)
439 codebook_setup->maxdepth = tmp_vlc_bits[t];
440
441 if (codebook_setup->maxdepth > 3 * V_NB_BITS)
442 codebook_setup->nb_bits = V_NB_BITS2;
443 else
444 codebook_setup->nb_bits = V_NB_BITS;
445
446 codebook_setup->maxdepth = (codebook_setup->maxdepth+codebook_setup->nb_bits - 1) / codebook_setup->nb_bits;
447
448 if ((ret = init_vlc(&codebook_setup->vlc, codebook_setup->nb_bits,
449 entries, tmp_vlc_bits, sizeof(*tmp_vlc_bits),
450 sizeof(*tmp_vlc_bits), tmp_vlc_codes,
451 sizeof(*tmp_vlc_codes), sizeof(*tmp_vlc_codes),
452 INIT_VLC_LE))) {
453 av_log(vc->avctx, AV_LOG_ERROR, " Error generating vlc tables. \n");
454 goto error;
455 }
456 }
457
458 av_free(tmp_vlc_bits);
459 av_free(tmp_vlc_codes);
460 av_free(codebook_multiplicands);
461 return 0;
462
463// Error:
464error:
465 av_free(tmp_vlc_bits);
466 av_free(tmp_vlc_codes);
467 av_free(codebook_multiplicands);
468 return ret;
469}
470
471// Process time domain transforms part (unused in Vorbis I)
472
473static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc)
474{
475 GetBitContext *gb = &vc->gb;
476 unsigned i, vorbis_time_count = get_bits(gb, 6) + 1;
477
478 for (i = 0; i < vorbis_time_count; ++i) {
479 unsigned vorbis_tdtransform = get_bits(gb, 16);
480
481 ff_dlog(NULL, " Vorbis time domain transform %u: %u\n",
482 vorbis_time_count, vorbis_tdtransform);
483
484 if (vorbis_tdtransform) {
485 av_log(vc->avctx, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n");
486 return AVERROR_INVALIDDATA;
487 }
488 }
489 return 0;
490}
491
492// Process floors part
493
494static int vorbis_floor0_decode(vorbis_context *vc,
495 vorbis_floor_data *vfu, float *vec);
496static int create_map(vorbis_context *vc, unsigned floor_number);
497static int vorbis_floor1_decode(vorbis_context *vc,
498 vorbis_floor_data *vfu, float *vec);
499static int vorbis_parse_setup_hdr_floors(vorbis_context *vc)
500{
501 GetBitContext *gb = &vc->gb;
502 int i, j, k, ret;
503
504 vc->floor_count = get_bits(gb, 6) + 1;
505
506 vc->floors = av_mallocz(vc->floor_count * sizeof(*vc->floors));
507 if (!vc->floors)
508 return AVERROR(ENOMEM);
509
510 for (i = 0; i < vc->floor_count; ++i) {
511 vorbis_floor *floor_setup = &vc->floors[i];
512
513 floor_setup->floor_type = get_bits(gb, 16);
514
515 ff_dlog(NULL, " %d. floor type %d \n", i, floor_setup->floor_type);
516
517 if (floor_setup->floor_type == 1) {
518 int maximum_class = -1;
519 unsigned rangebits, rangemax, floor1_values = 2;
520
521 floor_setup->decode = vorbis_floor1_decode;
522
523 floor_setup->data.t1.partitions = get_bits(gb, 5);
524
525 ff_dlog(NULL, " %d.floor: %d partitions \n",
526 i, floor_setup->data.t1.partitions);
527
528 for (j = 0; j < floor_setup->data.t1.partitions; ++j) {
529 floor_setup->data.t1.partition_class[j] = get_bits(gb, 4);
530 if (floor_setup->data.t1.partition_class[j] > maximum_class)
531 maximum_class = floor_setup->data.t1.partition_class[j];
532
533 ff_dlog(NULL, " %d. floor %d partition class %d \n",
534 i, j, floor_setup->data.t1.partition_class[j]);
535
536 }
537
538 ff_dlog(NULL, " maximum class %d \n", maximum_class);
539
540 for (j = 0; j <= maximum_class; ++j) {
541 floor_setup->data.t1.class_dimensions[j] = get_bits(gb, 3) + 1;
542 floor_setup->data.t1.class_subclasses[j] = get_bits(gb, 2);
543
544 ff_dlog(NULL, " %d floor %d class dim: %d subclasses %d \n", i, j,
545 floor_setup->data.t1.class_dimensions[j],
546 floor_setup->data.t1.class_subclasses[j]);
547
548 if (floor_setup->data.t1.class_subclasses[j]) {
549 GET_VALIDATED_INDEX(floor_setup->data.t1.class_masterbook[j], 8, vc->codebook_count)
550
551 ff_dlog(NULL, " masterbook: %d \n", floor_setup->data.t1.class_masterbook[j]);
552 }
553
554 for (k = 0; k < (1 << floor_setup->data.t1.class_subclasses[j]); ++k) {
555 int16_t bits = get_bits(gb, 8) - 1;
556 if (bits != -1)
557 VALIDATE_INDEX(bits, vc->codebook_count)
558 floor_setup->data.t1.subclass_books[j][k] = bits;
559
560 ff_dlog(NULL, " book %d. : %d \n", k, floor_setup->data.t1.subclass_books[j][k]);
561 }
562 }
563
564 floor_setup->data.t1.multiplier = get_bits(gb, 2) + 1;
565 floor_setup->data.t1.x_list_dim = 2;
566
567 for (j = 0; j < floor_setup->data.t1.partitions; ++j)
568 floor_setup->data.t1.x_list_dim+=floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];
569
570 floor_setup->data.t1.list = av_mallocz_array(floor_setup->data.t1.x_list_dim,
571 sizeof(*floor_setup->data.t1.list));
572 if (!floor_setup->data.t1.list)
573 return AVERROR(ENOMEM);
574
575 rangebits = get_bits(gb, 4);
576 if (!rangebits && floor_setup->data.t1.partitions) {
577 av_log(vc->avctx, AV_LOG_ERROR,
578 "A rangebits value of 0 is not compliant with the Vorbis I specification.\n");
579 return AVERROR_INVALIDDATA;
580 }
581 rangemax = (1 << rangebits);
582 if (rangemax > vc->blocksize[1] / 2) {
583 av_log(vc->avctx, AV_LOG_ERROR,
584 "Floor value is too large for blocksize: %u (%"PRIu32")\n",
585 rangemax, vc->blocksize[1] / 2);
586 return AVERROR_INVALIDDATA;
587 }
588 floor_setup->data.t1.list[0].x = 0;
589 floor_setup->data.t1.list[1].x = rangemax;
590
591 for (j = 0; j < floor_setup->data.t1.partitions; ++j) {
592 for (k = 0; k < floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]]; ++k, ++floor1_values) {
593 floor_setup->data.t1.list[floor1_values].x = get_bits(gb, rangebits);
594
595 ff_dlog(NULL, " %u. floor1 Y coord. %d\n", floor1_values,
596 floor_setup->data.t1.list[floor1_values].x);
597 }
598 }
599
600// Precalculate order of x coordinates - needed for decode
601 if (ff_vorbis_ready_floor1_list(vc->avctx,
602 floor_setup->data.t1.list,
603 floor_setup->data.t1.x_list_dim)) {
604 return AVERROR_INVALIDDATA;
605 }
606 } else if (floor_setup->floor_type == 0) {
607 unsigned max_codebook_dim = 0;
608
609 floor_setup->decode = vorbis_floor0_decode;
610
611 floor_setup->data.t0.order = get_bits(gb, 8);
612 if (!floor_setup->data.t0.order) {
613 av_log(vc->avctx, AV_LOG_ERROR, "Floor 0 order is 0.\n");
614 return AVERROR_INVALIDDATA;
615 }
616 floor_setup->data.t0.rate = get_bits(gb, 16);
617 if (!floor_setup->data.t0.rate) {
618 av_log(vc->avctx, AV_LOG_ERROR, "Floor 0 rate is 0.\n");
619 return AVERROR_INVALIDDATA;
620 }
621 floor_setup->data.t0.bark_map_size = get_bits(gb, 16);
622 if (!floor_setup->data.t0.bark_map_size) {
623 av_log(vc->avctx, AV_LOG_ERROR,
624 "Floor 0 bark map size is 0.\n");
625 return AVERROR_INVALIDDATA;
626 }
627 floor_setup->data.t0.amplitude_bits = get_bits(gb, 6);
628 floor_setup->data.t0.amplitude_offset = get_bits(gb, 8);
629 floor_setup->data.t0.num_books = get_bits(gb, 4) + 1;
630
631 /* allocate mem for booklist */
632 floor_setup->data.t0.book_list =
633 av_malloc(floor_setup->data.t0.num_books);
634 if (!floor_setup->data.t0.book_list)
635 return AVERROR(ENOMEM);
636 /* read book indexes */
637 {
638 int idx;
639 unsigned book_idx;
640 for (idx = 0; idx < floor_setup->data.t0.num_books; ++idx) {
641 GET_VALIDATED_INDEX(book_idx, 8, vc->codebook_count)
642 floor_setup->data.t0.book_list[idx] = book_idx;
643 if (vc->codebooks[book_idx].dimensions > max_codebook_dim)
644 max_codebook_dim = vc->codebooks[book_idx].dimensions;
645 }
646 }
647
648 if ((ret = create_map(vc, i)) < 0)
649 return ret;
650
651 /* codebook dim is for padding if codebook dim doesn't *
652 * divide order+1 then we need to read more data */
653 floor_setup->data.t0.lsp =
654 av_malloc_array((floor_setup->data.t0.order + 1 + max_codebook_dim),
655 sizeof(*floor_setup->data.t0.lsp));
656 if (!floor_setup->data.t0.lsp)
657 return AVERROR(ENOMEM);
658
659 /* debug output parsed headers */
660 ff_dlog(NULL, "floor0 order: %u\n", floor_setup->data.t0.order);
661 ff_dlog(NULL, "floor0 rate: %u\n", floor_setup->data.t0.rate);
662 ff_dlog(NULL, "floor0 bark map size: %u\n",
663 floor_setup->data.t0.bark_map_size);
664 ff_dlog(NULL, "floor0 amplitude bits: %u\n",
665 floor_setup->data.t0.amplitude_bits);
666 ff_dlog(NULL, "floor0 amplitude offset: %u\n",
667 floor_setup->data.t0.amplitude_offset);
668 ff_dlog(NULL, "floor0 number of books: %u\n",
669 floor_setup->data.t0.num_books);
670 ff_dlog(NULL, "floor0 book list pointer: %p\n",
671 floor_setup->data.t0.book_list);
672 {
673 int idx;
674 for (idx = 0; idx < floor_setup->data.t0.num_books; ++idx) {
675 ff_dlog(NULL, " Book %d: %u\n", idx + 1,
676 floor_setup->data.t0.book_list[idx]);
677 }
678 }
679 } else {
680 av_log(vc->avctx, AV_LOG_ERROR, "Invalid floor type!\n");
681 return AVERROR_INVALIDDATA;
682 }
683 }
684 return 0;
685}
686
687// Process residues part
688
689static int vorbis_parse_setup_hdr_residues(vorbis_context *vc)
690{
691 GetBitContext *gb = &vc->gb;
692 unsigned i, j, k;
693
694 vc->residue_count = get_bits(gb, 6)+1;
695 vc->residues = av_mallocz(vc->residue_count * sizeof(*vc->residues));
696 if (!vc->residues)
697 return AVERROR(ENOMEM);
698
699 ff_dlog(NULL, " There are %d residues. \n", vc->residue_count);
700
701 for (i = 0; i < vc->residue_count; ++i) {
702 vorbis_residue *res_setup = &vc->residues[i];
703 uint8_t cascade[64];
704 unsigned high_bits, low_bits;
705
706 res_setup->type = get_bits(gb, 16);
707
708 ff_dlog(NULL, " %u. residue type %d\n", i, res_setup->type);
709
710 res_setup->begin = get_bits(gb, 24);
711 res_setup->end = get_bits(gb, 24);
712 res_setup->partition_size = get_bits(gb, 24) + 1;
713 /* Validations to prevent a buffer overflow later. */
714 if (res_setup->begin>res_setup->end ||
715 (res_setup->end-res_setup->begin) / res_setup->partition_size > FFMIN(V_MAX_PARTITIONS, 65535)) {
716 av_log(vc->avctx, AV_LOG_ERROR,
717 "partition out of bounds: type, begin, end, size, blocksize: %"PRIu16", %"PRIu32", %"PRIu32", %u, %"PRIu32"\n",
718 res_setup->type, res_setup->begin, res_setup->end,
719 res_setup->partition_size, vc->blocksize[1] / 2);
720 return AVERROR_INVALIDDATA;
721 }
722
723 res_setup->classifications = get_bits(gb, 6) + 1;
724 GET_VALIDATED_INDEX(res_setup->classbook, 8, vc->codebook_count)
725
726 res_setup->ptns_to_read =
727 (res_setup->end - res_setup->begin) / res_setup->partition_size;
728 res_setup->classifs = av_malloc_array(res_setup->ptns_to_read,
729 vc->audio_channels *
730 sizeof(*res_setup->classifs));
731 if (!res_setup->classifs)
732 return AVERROR(ENOMEM);
733
734 ff_dlog(NULL, " begin %"PRIu32" end %"PRIu32" part.size %d classif.s %d classbook %d \n",
735 res_setup->begin, res_setup->end, res_setup->partition_size,
736 res_setup->classifications, res_setup->classbook);
737
738 for (j = 0; j < res_setup->classifications; ++j) {
739 high_bits = 0;
740 low_bits = get_bits(gb, 3);
741 if (get_bits1(gb))
742 high_bits = get_bits(gb, 5);
743 cascade[j] = (high_bits << 3) + low_bits;
744
745 ff_dlog(NULL, " %u class cascade depth: %d\n", j, ilog(cascade[j]));
746 }
747
748 res_setup->maxpass = 0;
749 for (j = 0; j < res_setup->classifications; ++j) {
750 for (k = 0; k < 8; ++k) {
751 if (cascade[j]&(1 << k)) {
752 GET_VALIDATED_INDEX(res_setup->books[j][k], 8, vc->codebook_count)
753
754 ff_dlog(NULL, " %u class cascade depth %u book: %d\n",
755 j, k, res_setup->books[j][k]);
756
757 if (k>res_setup->maxpass)
758 res_setup->maxpass = k;
759 } else {
760 res_setup->books[j][k] = -1;
761 }
762 }
763 }
764 }
765 return 0;
766}
767
768// Process mappings part
769
770static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc)
771{
772 GetBitContext *gb = &vc->gb;
773 unsigned i, j;
774
775 vc->mapping_count = get_bits(gb, 6)+1;
776 vc->mappings = av_mallocz(vc->mapping_count * sizeof(*vc->mappings));
777 if (!vc->mappings)
778 return AVERROR(ENOMEM);
779
780 ff_dlog(NULL, " There are %d mappings. \n", vc->mapping_count);
781
782 for (i = 0; i < vc->mapping_count; ++i) {
783 vorbis_mapping *mapping_setup = &vc->mappings[i];
784
785 if (get_bits(gb, 16)) {
786 av_log(vc->avctx, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n");
787 return AVERROR_INVALIDDATA;
788 }
789 if (get_bits1(gb)) {
790 mapping_setup->submaps = get_bits(gb, 4) + 1;
791 } else {
792 mapping_setup->submaps = 1;
793 }
794
795 if (get_bits1(gb)) {
796 mapping_setup->coupling_steps = get_bits(gb, 8) + 1;
797 if (vc->audio_channels < 2) {
798 av_log(vc->avctx, AV_LOG_ERROR,
799 "Square polar channel mapping with less than two channels is not compliant with the Vorbis I specification.\n");
800 return AVERROR_INVALIDDATA;
801 }
802 mapping_setup->magnitude = av_mallocz(mapping_setup->coupling_steps *
803 sizeof(*mapping_setup->magnitude));
804 mapping_setup->angle = av_mallocz(mapping_setup->coupling_steps *
805 sizeof(*mapping_setup->angle));
806 if (!mapping_setup->angle || !mapping_setup->magnitude)
807 return AVERROR(ENOMEM);
808
809 for (j = 0; j < mapping_setup->coupling_steps; ++j) {
810 GET_VALIDATED_INDEX(mapping_setup->magnitude[j], ilog(vc->audio_channels - 1), vc->audio_channels)
811 GET_VALIDATED_INDEX(mapping_setup->angle[j], ilog(vc->audio_channels - 1), vc->audio_channels)
812 }
813 } else {
814 mapping_setup->coupling_steps = 0;
815 }
816
817 ff_dlog(NULL, " %u mapping coupling steps: %d\n",
818 i, mapping_setup->coupling_steps);
819
820 if (get_bits(gb, 2)) {
821 av_log(vc->avctx, AV_LOG_ERROR, "%u. mapping setup data invalid.\n", i);
822 return AVERROR_INVALIDDATA; // following spec.
823 }
824
825 if (mapping_setup->submaps>1) {
826 mapping_setup->mux = av_mallocz_array(vc->audio_channels,
827 sizeof(*mapping_setup->mux));
828 if (!mapping_setup->mux)
829 return AVERROR(ENOMEM);
830
831 for (j = 0; j < vc->audio_channels; ++j)
832 mapping_setup->mux[j] = get_bits(gb, 4);
833 }
834
835 for (j = 0; j < mapping_setup->submaps; ++j) {
836 skip_bits(gb, 8); // FIXME check?
837 GET_VALIDATED_INDEX(mapping_setup->submap_floor[j], 8, vc->floor_count)
838 GET_VALIDATED_INDEX(mapping_setup->submap_residue[j], 8, vc->residue_count)
839
840 ff_dlog(NULL, " %u mapping %u submap : floor %d, residue %d\n", i, j,
841 mapping_setup->submap_floor[j],
842 mapping_setup->submap_residue[j]);
843 }
844 }
845 return 0;
846}
847
848// Process modes part
849
850static int create_map(vorbis_context *vc, unsigned floor_number)
851{
852 vorbis_floor *floors = vc->floors;
853 vorbis_floor0 *vf;
854 int idx;
855 int blockflag, n;
856 int32_t *map;
857
858 for (blockflag = 0; blockflag < 2; ++blockflag) {
859 n = vc->blocksize[blockflag] / 2;
860 floors[floor_number].data.t0.map[blockflag] =
861 av_malloc_array(n + 1, sizeof(int32_t)); // n + sentinel
862 if (!floors[floor_number].data.t0.map[blockflag])
863 return AVERROR(ENOMEM);
864
865 map = floors[floor_number].data.t0.map[blockflag];
866 vf = &floors[floor_number].data.t0;
867
868 for (idx = 0; idx < n; ++idx) {
869 map[idx] = floor(BARK((vf->rate * idx) / (2.0f * n)) *
870 (vf->bark_map_size / BARK(vf->rate / 2.0f)));
871 if (vf->bark_map_size-1 < map[idx])
872 map[idx] = vf->bark_map_size - 1;
873 }
874 map[n] = -1;
875 vf->map_size[blockflag] = n;
876 }
877
878 for (idx = 0; idx <= n; ++idx) {
879 ff_dlog(NULL, "floor0 map: map at pos %d is %"PRId32"\n", idx, map[idx]);
880 }
881
882 return 0;
883}
884
885static int vorbis_parse_setup_hdr_modes(vorbis_context *vc)
886{
887 GetBitContext *gb = &vc->gb;
888 unsigned i;
889
890 vc->mode_count = get_bits(gb, 6) + 1;
891 vc->modes = av_mallocz(vc->mode_count * sizeof(*vc->modes));
892 if (!vc->modes)
893 return AVERROR(ENOMEM);
894
895 ff_dlog(NULL, " There are %d modes.\n", vc->mode_count);
896
897 for (i = 0; i < vc->mode_count; ++i) {
898 vorbis_mode *mode_setup = &vc->modes[i];
899
900 mode_setup->blockflag = get_bits1(gb);
901 mode_setup->windowtype = get_bits(gb, 16); //FIXME check
902 mode_setup->transformtype = get_bits(gb, 16); //FIXME check
903 GET_VALIDATED_INDEX(mode_setup->mapping, 8, vc->mapping_count);
904
905 ff_dlog(NULL, " %u mode: blockflag %d, windowtype %d, transformtype %d, mapping %d\n",
906 i, mode_setup->blockflag, mode_setup->windowtype,
907 mode_setup->transformtype, mode_setup->mapping);
908 }
909 return 0;
910}
911
912// Process the whole setup header using the functions above
913
914static int vorbis_parse_setup_hdr(vorbis_context *vc)
915{
916 GetBitContext *gb = &vc->gb;
917 int ret;
918
919 if ((get_bits(gb, 8) != 'v') || (get_bits(gb, 8) != 'o') ||
920 (get_bits(gb, 8) != 'r') || (get_bits(gb, 8) != 'b') ||
921 (get_bits(gb, 8) != 'i') || (get_bits(gb, 8) != 's')) {
922 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n");
923 return AVERROR_INVALIDDATA;
924 }
925
926 if ((ret = vorbis_parse_setup_hdr_codebooks(vc))) {
927 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n");
928 return ret;
929 }
930 if ((ret = vorbis_parse_setup_hdr_tdtransforms(vc))) {
931 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n");
932 return ret;
933 }
934 if ((ret = vorbis_parse_setup_hdr_floors(vc))) {
935 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n");
936 return ret;
937 }
938 if ((ret = vorbis_parse_setup_hdr_residues(vc))) {
939 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n");
940 return ret;
941 }
942 if ((ret = vorbis_parse_setup_hdr_mappings(vc))) {
943 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n");
944 return ret;
945 }
946 if ((ret = vorbis_parse_setup_hdr_modes(vc))) {
947 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n");
948 return ret;
949 }
950 if (!get_bits1(gb)) {
951 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n");
952 return AVERROR_INVALIDDATA; // framing flag bit unset error
953 }
954
955 return 0;
956}
957
958// Process the identification header
959
960static int vorbis_parse_id_hdr(vorbis_context *vc)
961{
962 GetBitContext *gb = &vc->gb;
963 unsigned bl0, bl1;
964
965 if ((get_bits(gb, 8) != 'v') || (get_bits(gb, 8) != 'o') ||
966 (get_bits(gb, 8) != 'r') || (get_bits(gb, 8) != 'b') ||
967 (get_bits(gb, 8) != 'i') || (get_bits(gb, 8) != 's')) {
968 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n");
969 return AVERROR_INVALIDDATA;
970 }
971
972 vc->version = get_bits_long(gb, 32); //FIXME check 0
973 vc->audio_channels = get_bits(gb, 8);
974 if (vc->audio_channels <= 0) {
975 av_log(vc->avctx, AV_LOG_ERROR, "Invalid number of channels\n");
976 return AVERROR_INVALIDDATA;
977 }
978 vc->audio_samplerate = get_bits_long(gb, 32);
979 if (vc->audio_samplerate <= 0) {
980 av_log(vc->avctx, AV_LOG_ERROR, "Invalid samplerate\n");
981 return AVERROR_INVALIDDATA;
982 }
983 vc->bitrate_maximum = get_bits_long(gb, 32);
984 vc->bitrate_nominal = get_bits_long(gb, 32);
985 vc->bitrate_minimum = get_bits_long(gb, 32);
986 bl0 = get_bits(gb, 4);
987 bl1 = get_bits(gb, 4);
988 if (bl0 > 13 || bl0 < 6 || bl1 > 13 || bl1 < 6 || bl1 < bl0) {
989 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n");
990 return AVERROR_INVALIDDATA;
991 }
992 vc->blocksize[0] = (1 << bl0);
993 vc->blocksize[1] = (1 << bl1);
994 vc->win[0] = ff_vorbis_vwin[bl0 - 6];
995 vc->win[1] = ff_vorbis_vwin[bl1 - 6];
996
997 if ((get_bits1(gb)) == 0) {
998 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n");
999 return AVERROR_INVALIDDATA;
1000 }
1001
1002 vc->channel_residues = av_malloc_array(vc->blocksize[1] / 2, vc->audio_channels * sizeof(*vc->channel_residues));
1003 vc->saved = av_mallocz_array(vc->blocksize[1] / 4, vc->audio_channels * sizeof(*vc->saved));
1004 if (!vc->channel_residues || !vc->saved)
1005 return AVERROR(ENOMEM);
1006
1007 vc->previous_window = -1;
1008
1009 ff_mdct_init(&vc->mdct[0], bl0, 1, -1.0);
1010 ff_mdct_init(&vc->mdct[1], bl1, 1, -1.0);
1011 vc->fdsp = avpriv_float_dsp_alloc(vc->avctx->flags & AV_CODEC_FLAG_BITEXACT);
1012 if (!vc->fdsp)
1013 return AVERROR(ENOMEM);
1014
1015 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 ",
1016 vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize[0], vc->blocksize[1]);
1017
1018/*
1019 BLK = vc->blocksize[0];
1020 for (i = 0; i < BLK / 2; ++i) {
1021 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)));
1022 }
1023*/
1024
1025 return 0;
1026}
1027
1028// Process the extradata using the functions above (identification header, setup header)
1029
1030static av_cold int vorbis_decode_init(AVCodecContext *avctx)
1031{
1032 vorbis_context *vc = avctx->priv_data;
1033 uint8_t *headers = avctx->extradata;
1034 int headers_len = avctx->extradata_size;
1035 const uint8_t *header_start[3];
1036 int header_len[3];
1037 GetBitContext *gb = &vc->gb;
1038 int hdr_type, ret;
1039
1040 vc->avctx = avctx;
1041 ff_vorbisdsp_init(&vc->dsp);
1042
1043 avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
1044
1045 if (!headers_len) {
1046 av_log(avctx, AV_LOG_ERROR, "Extradata missing.\n");
1047 return AVERROR_INVALIDDATA;
1048 }
1049
1050 if ((ret = avpriv_split_xiph_headers(headers, headers_len, 30, header_start, header_len)) < 0) {
1051 av_log(avctx, AV_LOG_ERROR, "Extradata corrupt.\n");
1052 return ret;
1053 }
1054
1055 init_get_bits(gb, header_start[0], header_len[0]*8);
1056 hdr_type = get_bits(gb, 8);
1057 if (hdr_type != 1) {
1058 av_log(avctx, AV_LOG_ERROR, "First header is not the id header.\n");
1059 return AVERROR_INVALIDDATA;
1060 }
1061 if ((ret = vorbis_parse_id_hdr(vc))) {
1062 av_log(avctx, AV_LOG_ERROR, "Id header corrupt.\n");
1063 vorbis_free(vc);
1064 return ret;
1065 }
1066
1067 init_get_bits(gb, header_start[2], header_len[2]*8);
1068 hdr_type = get_bits(gb, 8);
1069 if (hdr_type != 5) {
1070 av_log(avctx, AV_LOG_ERROR, "Third header is not the setup header.\n");
1071 vorbis_free(vc);
1072 return AVERROR_INVALIDDATA;
1073 }
1074 if ((ret = vorbis_parse_setup_hdr(vc))) {
1075 av_log(avctx, AV_LOG_ERROR, "Setup header corrupt.\n");
1076 vorbis_free(vc);
1077 return ret;
1078 }
1079
1080 if (vc->audio_channels > 8)
1081 avctx->channel_layout = 0;
1082 else
1083 avctx->channel_layout = ff_vorbis_channel_layouts[vc->audio_channels - 1];
1084
1085 avctx->channels = vc->audio_channels;
1086 avctx->sample_rate = vc->audio_samplerate;
1087
1088 return 0;
1089}
1090
1091// Decode audiopackets -------------------------------------------------
1092
1093// Read and decode floor
1094
1095static int vorbis_floor0_decode(vorbis_context *vc,
1096 vorbis_floor_data *vfu, float *vec)
1097{
1098 vorbis_floor0 *vf = &vfu->t0;
1099 float *lsp = vf->lsp;
1100 unsigned amplitude, book_idx;
1101 unsigned blockflag = vc->modes[vc->mode_number].blockflag;
1102
1103 if (!vf->amplitude_bits)
1104 return 1;
1105
1106 amplitude = get_bits(&vc->gb, vf->amplitude_bits);
1107 if (amplitude > 0) {
1108 float last = 0;
1109 unsigned idx, lsp_len = 0;
1110 vorbis_codebook codebook;
1111
1112 book_idx = get_bits(&vc->gb, ilog(vf->num_books));
1113 if (book_idx >= vf->num_books) {
1114 av_log(vc->avctx, AV_LOG_ERROR, "floor0 dec: booknumber too high!\n");
1115 book_idx = 0;
1116 }
1117 ff_dlog(NULL, "floor0 dec: booknumber: %u\n", book_idx);
1118 codebook = vc->codebooks[vf->book_list[book_idx]];
1119 /* Invalid codebook! */
1120 if (!codebook.codevectors)
1121 return AVERROR_INVALIDDATA;
1122
1123 while (lsp_len<vf->order) {
1124 int vec_off;
1125
1126 ff_dlog(NULL, "floor0 dec: book dimension: %d\n", codebook.dimensions);
1127 ff_dlog(NULL, "floor0 dec: maximum depth: %d\n", codebook.maxdepth);
1128 /* read temp vector */
1129 vec_off = get_vlc2(&vc->gb, codebook.vlc.table,
1130 codebook.nb_bits, codebook.maxdepth)
1131 * codebook.dimensions;
1132 ff_dlog(NULL, "floor0 dec: vector offset: %d\n", vec_off);
1133 /* copy each vector component and add last to it */
1134 for (idx = 0; idx < codebook.dimensions; ++idx)
1135 lsp[lsp_len+idx] = codebook.codevectors[vec_off+idx] + last;
1136 last = lsp[lsp_len+idx-1]; /* set last to last vector component */
1137
1138 lsp_len += codebook.dimensions;
1139 }
1140 /* DEBUG: output lsp coeffs */
1141 {
1142 int idx;
1143 for (idx = 0; idx < lsp_len; ++idx)
1144 ff_dlog(NULL, "floor0 dec: coeff at %d is %f\n", idx, lsp[idx]);
1145 }
1146
1147 /* synthesize floor output vector */
1148 {
1149 int i;
1150 int order = vf->order;
1151 float wstep = M_PI / vf->bark_map_size;
1152
1153 for (i = 0; i < order; i++)
1154 lsp[i] = 2.0f * cos(lsp[i]);
1155
1156 ff_dlog(NULL, "floor0 synth: map_size = %"PRIu32"; m = %d; wstep = %f\n",
1157 vf->map_size[blockflag], order, wstep);
1158
1159 i = 0;
1160 while (i < vf->map_size[blockflag]) {
1161 int j, iter_cond = vf->map[blockflag][i];
1162 float p = 0.5f;
1163 float q = 0.5f;
1164 float two_cos_w = 2.0f * cos(wstep * iter_cond); // needed all times
1165
1166 /* similar part for the q and p products */
1167 for (j = 0; j + 1 < order; j += 2) {
1168 q *= lsp[j] - two_cos_w;
1169 p *= lsp[j + 1] - two_cos_w;
1170 }
1171 if (j == order) { // even order
1172 p *= p * (2.0f - two_cos_w);
1173 q *= q * (2.0f + two_cos_w);
1174 } else { // odd order
1175 q *= two_cos_w-lsp[j]; // one more time for q
1176
1177 /* final step and square */
1178 p *= p * (4.f - two_cos_w * two_cos_w);
1179 q *= q;
1180 }
1181
1182 /* calculate linear floor value */
1183 q = exp((((amplitude*vf->amplitude_offset) /
1184 (((1 << vf->amplitude_bits) - 1) * sqrt(p + q)))
1185 - vf->amplitude_offset) * .11512925f);
1186
1187 /* fill vector */
1188 do {
1189 vec[i] = q; ++i;
1190 } while (vf->map[blockflag][i] == iter_cond);
1191 }
1192 }
1193 } else {
1194 /* this channel is unused */
1195 return 1;
1196 }
1197
1198 ff_dlog(NULL, " Floor0 decoded\n");
1199
1200 return 0;
1201}
1202
1203static int vorbis_floor1_decode(vorbis_context *vc,
1204 vorbis_floor_data *vfu, float *vec)
1205{
1206 vorbis_floor1 *vf = &vfu->t1;
1207 GetBitContext *gb = &vc->gb;
1208 uint16_t range_v[4] = { 256, 128, 86, 64 };
1209 unsigned range = range_v[vf->multiplier - 1];
1210 uint16_t floor1_Y[258];
1211 uint16_t floor1_Y_final[258];
1212 int floor1_flag[258];
1213 unsigned partition_class, cdim, cbits, csub, cval, offset, i, j;
1214 int book, adx, ady, dy, off, predicted, err;
1215
1216
1217 if (!get_bits1(gb)) // silence
1218 return 1;
1219
1220// Read values (or differences) for the floor's points
1221
1222 floor1_Y[0] = get_bits(gb, ilog(range - 1));
1223 floor1_Y[1] = get_bits(gb, ilog(range - 1));
1224
1225 ff_dlog(NULL, "floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);
1226
1227 offset = 2;
1228 for (i = 0; i < vf->partitions; ++i) {
1229 partition_class = vf->partition_class[i];
1230 cdim = vf->class_dimensions[partition_class];
1231 cbits = vf->class_subclasses[partition_class];
1232 csub = (1 << cbits) - 1;
1233 cval = 0;
1234
1235 ff_dlog(NULL, "Cbits %u\n", cbits);
1236
1237 if (cbits) // this reads all subclasses for this partition's class
1238 cval = get_vlc2(gb, vc->codebooks[vf->class_masterbook[partition_class]].vlc.table,
1239 vc->codebooks[vf->class_masterbook[partition_class]].nb_bits, 3);
1240
1241 for (j = 0; j < cdim; ++j) {
1242 book = vf->subclass_books[partition_class][cval & csub];
1243
1244 ff_dlog(NULL, "book %d Cbits %u cval %u bits:%d\n",
1245 book, cbits, cval, get_bits_count(gb));
1246
1247 cval = cval >> cbits;
1248 if (book > -1) {
1249 int v = get_vlc2(gb, vc->codebooks[book].vlc.table,
1250 vc->codebooks[book].nb_bits, 3);
1251 if (v < 0)
1252 return AVERROR_INVALIDDATA;
1253 floor1_Y[offset+j] = v;
1254 } else {
1255 floor1_Y[offset+j] = 0;
1256 }
1257
1258 ff_dlog(NULL, " floor(%d) = %d \n",
1259 vf->list[offset+j].x, floor1_Y[offset+j]);
1260 }
1261 offset+=cdim;
1262 }
1263
1264// Amplitude calculation from the differences
1265
1266 floor1_flag[0] = 1;
1267 floor1_flag[1] = 1;
1268 floor1_Y_final[0] = floor1_Y[0];
1269 floor1_Y_final[1] = floor1_Y[1];
1270
1271 for (i = 2; i < vf->x_list_dim; ++i) {
1272 unsigned val, highroom, lowroom, room, high_neigh_offs, low_neigh_offs;
1273
1274 low_neigh_offs = vf->list[i].low;
1275 high_neigh_offs = vf->list[i].high;
1276 dy = floor1_Y_final[high_neigh_offs] - floor1_Y_final[low_neigh_offs]; // render_point begin
1277 adx = vf->list[high_neigh_offs].x - vf->list[low_neigh_offs].x;
1278 ady = FFABS(dy);
1279 err = ady * (vf->list[i].x - vf->list[low_neigh_offs].x);
1280 off = err / adx;
1281 if (dy < 0) {
1282 predicted = floor1_Y_final[low_neigh_offs] - off;
1283 } else {
1284 predicted = floor1_Y_final[low_neigh_offs] + off;
1285 } // render_point end
1286
1287 val = floor1_Y[i];
1288 highroom = range-predicted;
1289 lowroom = predicted;
1290 if (highroom < lowroom) {
1291 room = highroom * 2;
1292 } else {
1293 room = lowroom * 2; // SPEC misspelling
1294 }
1295 if (val) {
1296 floor1_flag[low_neigh_offs] = 1;
1297 floor1_flag[high_neigh_offs] = 1;
1298 floor1_flag[i] = 1;
1299 if (val >= room) {
1300 if (highroom > lowroom) {
1301 floor1_Y_final[i] = av_clip_uint16(val - lowroom + predicted);
1302 } else {
1303 floor1_Y_final[i] = av_clip_uint16(predicted - val + highroom - 1);
1304 }
1305 } else {
1306 if (val & 1) {
1307 floor1_Y_final[i] = av_clip_uint16(predicted - (val + 1) / 2);
1308 } else {
1309 floor1_Y_final[i] = av_clip_uint16(predicted + val / 2);
1310 }
1311 }
1312 } else {
1313 floor1_flag[i] = 0;
1314 floor1_Y_final[i] = av_clip_uint16(predicted);
1315 }
1316
1317 ff_dlog(NULL, " Decoded floor(%d) = %u / val %u\n",
1318 vf->list[i].x, floor1_Y_final[i], val);
1319 }
1320
1321// Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?
1322
1323 ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);
1324
1325 ff_dlog(NULL, " Floor decoded\n");
1326
1327 return 0;
1328}
1329
1330static av_always_inline int setup_classifs(vorbis_context *vc,
1331 vorbis_residue *vr,
1332 uint8_t *do_not_decode,
1333 unsigned ch_used,
1334 int partition_count,
1335 int ptns_to_read
1336 )
1337{
1338 vorbis_codebook *codebook = vc->codebooks + vr->classbook;
1339 int p, j, i;
1340 unsigned c_p_c = codebook->dimensions;
1341 unsigned inverse_class = ff_inverse[vr->classifications];
1342 int temp, temp2;
1343 for (p = 0, j = 0; j < ch_used; ++j) {
1344 if (!do_not_decode[j]) {
1345 temp = get_vlc2(&vc->gb, codebook->vlc.table,
1346 codebook->nb_bits, 3);
1347
1348 ff_dlog(NULL, "Classword: %u\n", temp);
1349
1350 av_assert0(temp < 65536);
1351
1352 if (temp < 0) {
1353 av_log(vc->avctx, AV_LOG_ERROR,
1354 "Invalid vlc code decoding %d channel.", j);
1355 return AVERROR_INVALIDDATA;
1356 }
1357
1358 av_assert0(vr->classifications > 1); //needed for inverse[]
1359
1360 for (i = partition_count + c_p_c - 1; i >= partition_count; i--) {
1361 temp2 = (((uint64_t)temp) * inverse_class) >> 32;
1362
1363 if (i < ptns_to_read)
1364 vr->classifs[p + i] = temp - temp2 * vr->classifications;
1365 temp = temp2;
1366 }
1367 }
1368 p += ptns_to_read;
1369 }
1370 return 0;
1371}
1372// Read and decode residue
1373
1374static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc,
1375 vorbis_residue *vr,
1376 unsigned ch,
1377 uint8_t *do_not_decode,
1378 float *vec,
1379 unsigned vlen,
1380 unsigned ch_left,
1381 int vr_type)
1382{
1383 GetBitContext *gb = &vc->gb;
1384 unsigned c_p_c = vc->codebooks[vr->classbook].dimensions;
1385 uint8_t *classifs = vr->classifs;
1386 unsigned pass, ch_used, i, j, k, l;
1387 unsigned max_output = (ch - 1) * vlen;
1388 int ptns_to_read = vr->ptns_to_read;
1389 int libvorbis_bug = 0;
1390
1391 if (vr_type == 2) {
1392 for (j = 1; j < ch; ++j)
1393 do_not_decode[0] &= do_not_decode[j]; // FIXME - clobbering input
1394 if (do_not_decode[0])
1395 return 0;
1396 ch_used = 1;
1397 max_output += vr->end / ch;
1398 } else {
1399 ch_used = ch;
1400 max_output += vr->end;
1401 }
1402
1403 if (max_output > ch_left * vlen) {
1404 if (max_output <= ch_left * vlen + vr->partition_size*ch_used/ch) {
1405 ptns_to_read--;
1406 libvorbis_bug = 1;
1407 } else {
1408 av_log(vc->avctx, AV_LOG_ERROR, "Insufficient output buffer\n");
1409 return AVERROR_INVALIDDATA;
1410 }
1411 }
1412
1413 ff_dlog(NULL, " residue type 0/1/2 decode begin, ch: %d cpc %d \n", ch, c_p_c);
1414
1415 for (pass = 0; pass <= vr->maxpass; ++pass) { // FIXME OPTIMIZE?
1416 int voffset, partition_count, j_times_ptns_to_read;
1417
1418 voffset = vr->begin;
1419 for (partition_count = 0; partition_count < ptns_to_read;) { // SPEC error
1420 if (!pass) {
1421 int ret = setup_classifs(vc, vr, do_not_decode, ch_used, partition_count, ptns_to_read);
1422 if (ret < 0)
1423 return ret;
1424 }
1425 for (i = 0; (i < c_p_c) && (partition_count < ptns_to_read); ++i) {
1426 for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {
1427 unsigned voffs;
1428
1429 if (!do_not_decode[j]) {
1430 unsigned vqclass = classifs[j_times_ptns_to_read + partition_count];
1431 int vqbook = vr->books[vqclass][pass];
1432
1433 if (vqbook >= 0 && vc->codebooks[vqbook].codevectors) {
1434 unsigned coffs;
1435 unsigned dim = vc->codebooks[vqbook].dimensions;
1436 unsigned step = FASTDIV(vr->partition_size << 1, dim << 1);
1437 vorbis_codebook codebook = vc->codebooks[vqbook];
1438
1439 if (vr_type == 0) {
1440
1441 voffs = voffset+j*vlen;
1442 for (k = 0; k < step; ++k) {
1443 coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1444 for (l = 0; l < dim; ++l)
1445 vec[voffs + k + l * step] += codebook.codevectors[coffs + l];
1446 }
1447 } else if (vr_type == 1) {
1448 voffs = voffset + j * vlen;
1449 for (k = 0; k < step; ++k) {
1450 coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1451 for (l = 0; l < dim; ++l, ++voffs) {
1452 vec[voffs]+=codebook.codevectors[coffs+l];
1453
1454 ff_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d \n",
1455 pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);
1456 }
1457 }
1458 } else if (vr_type == 2 && ch == 2 && (voffset & 1) == 0 && (dim & 1) == 0) { // most frequent case optimized
1459 voffs = voffset >> 1;
1460
1461 if (dim == 2) {
1462 for (k = 0; k < step; ++k) {
1463 coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;
1464 vec[voffs + k ] += codebook.codevectors[coffs ];
1465 vec[voffs + k + vlen] += codebook.codevectors[coffs + 1];
1466 }
1467 } else if (dim == 4) {
1468 for (k = 0; k < step; ++k, voffs += 2) {
1469 coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4;
1470 vec[voffs ] += codebook.codevectors[coffs ];
1471 vec[voffs + 1 ] += codebook.codevectors[coffs + 2];
1472 vec[voffs + vlen ] += codebook.codevectors[coffs + 1];
1473 vec[voffs + vlen + 1] += codebook.codevectors[coffs + 3];
1474 }
1475 } else
1476 for (k = 0; k < step; ++k) {
1477 coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1478 for (l = 0; l < dim; l += 2, voffs++) {
1479 vec[voffs ] += codebook.codevectors[coffs + l ];
1480 vec[voffs + vlen] += codebook.codevectors[coffs + l + 1];
1481
1482 ff_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d+%d \n",
1483 pass, voffset / ch + (voffs % ch) * vlen,
1484 vec[voffset / ch + (voffs % ch) * vlen],
1485 codebook.codevectors[coffs + l], coffs, l);
1486 }
1487 }
1488
1489 } else if (vr_type == 2) {
1490 unsigned voffs_div = FASTDIV(voffset << 1, ch <<1);
1491 unsigned voffs_mod = voffset - voffs_div * ch;
1492
1493 for (k = 0; k < step; ++k) {
1494 coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1495 for (l = 0; l < dim; ++l) {
1496 vec[voffs_div + voffs_mod * vlen] +=
1497 codebook.codevectors[coffs + l];
1498
1499 ff_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d+%d \n",
1500 pass, voffs_div + voffs_mod * vlen,
1501 vec[voffs_div + voffs_mod * vlen],
1502 codebook.codevectors[coffs + l], coffs, l);
1503
1504 if (++voffs_mod == ch) {
1505 voffs_div++;
1506 voffs_mod = 0;
1507 }
1508 }
1509 }
1510 }
1511 }
1512 }
1513 j_times_ptns_to_read += ptns_to_read;
1514 }
1515 ++partition_count;
1516 voffset += vr->partition_size;
1517 }
1518 }
1519 if (libvorbis_bug && !pass) {
1520 for (j = 0; j < ch_used; ++j) {
1521 if (!do_not_decode[j]) {
1522 get_vlc2(&vc->gb, vc->codebooks[vr->classbook].vlc.table,
1523 vc->codebooks[vr->classbook].nb_bits, 3);
1524 }
1525 }
1526 }
1527 }
1528 return 0;
1529}
1530
1531static inline int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr,
1532 unsigned ch,
1533 uint8_t *do_not_decode,
1534 float *vec, unsigned vlen,
1535 unsigned ch_left)
1536{
1537 if (vr->type == 2)
1538 return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 2);
1539 else if (vr->type == 1)
1540 return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 1);
1541 else if (vr->type == 0)
1542 return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 0);
1543 else {
1544 av_log(vc->avctx, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");
1545 return AVERROR_INVALIDDATA;
1546 }
1547}
1548
1549void ff_vorbis_inverse_coupling(float *mag, float *ang, intptr_t blocksize)
1550{
1551 int i;
1552 for (i = 0; i < blocksize; i++) {
1553 if (mag[i] > 0.0) {
1554 if (ang[i] > 0.0) {
1555 ang[i] = mag[i] - ang[i];
1556 } else {
1557 float temp = ang[i];
1558 ang[i] = mag[i];
1559 mag[i] += temp;
1560 }
1561 } else {
1562 if (ang[i] > 0.0) {
1563 ang[i] += mag[i];
1564 } else {
1565 float temp = ang[i];
1566 ang[i] = mag[i];
1567 mag[i] -= temp;
1568 }
1569 }
1570 }
1571}
1572
1573// Decode the audio packet using the functions above
1574
1575static int vorbis_parse_audio_packet(vorbis_context *vc, float **floor_ptr)
1576{
1577 GetBitContext *gb = &vc->gb;
1578 FFTContext *mdct;
1579 int previous_window = vc->previous_window;
1580 unsigned mode_number, blockflag, blocksize;
1581 int i, j;
1582 uint8_t no_residue[255];
1583 uint8_t do_not_decode[255];
1584 vorbis_mapping *mapping;
1585 float *ch_res_ptr = vc->channel_residues;
1586 uint8_t res_chan[255];
1587 unsigned res_num = 0;
1588 int retlen = 0;
1589 unsigned ch_left = vc->audio_channels;
1590 unsigned vlen;
1591
1592 if (get_bits1(gb)) {
1593 av_log(vc->avctx, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");
1594 return AVERROR_INVALIDDATA; // packet type not audio
1595 }
1596
1597 if (vc->mode_count == 1) {
1598 mode_number = 0;
1599 } else {
1600 GET_VALIDATED_INDEX(mode_number, ilog(vc->mode_count-1), vc->mode_count)
1601 }
1602 vc->mode_number = mode_number;
1603 mapping = &vc->mappings[vc->modes[mode_number].mapping];
1604
1605 ff_dlog(NULL, " Mode number: %u , mapping: %d , blocktype %d\n", mode_number,
1606 vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);
1607
1608 blockflag = vc->modes[mode_number].blockflag;
1609 blocksize = vc->blocksize[blockflag];
1610 vlen = blocksize / 2;
1611 if (blockflag) {
1612 int code = get_bits(gb, 2);
1613 if (previous_window < 0)
1614 previous_window = code>>1;
1615 } else if (previous_window < 0)
1616 previous_window = 0;
1617
1618 memset(ch_res_ptr, 0, sizeof(float) * vc->audio_channels * vlen); //FIXME can this be removed ?
1619 for (i = 0; i < vc->audio_channels; ++i)
1620 memset(floor_ptr[i], 0, vlen * sizeof(floor_ptr[0][0])); //FIXME can this be removed ?
1621
1622// Decode floor
1623
1624 for (i = 0; i < vc->audio_channels; ++i) {
1625 vorbis_floor *floor;
1626 int ret;
1627 if (mapping->submaps > 1) {
1628 floor = &vc->floors[mapping->submap_floor[mapping->mux[i]]];
1629 } else {
1630 floor = &vc->floors[mapping->submap_floor[0]];
1631 }
1632
1633 ret = floor->decode(vc, &floor->data, floor_ptr[i]);
1634
1635 if (ret < 0) {
1636 av_log(vc->avctx, AV_LOG_ERROR, "Invalid codebook in vorbis_floor_decode.\n");
1637 return AVERROR_INVALIDDATA;
1638 }
1639 no_residue[i] = ret;
1640 }
1641
1642// Nonzero vector propagate
1643
1644 for (i = mapping->coupling_steps - 1; i >= 0; --i) {
1645 if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {
1646 no_residue[mapping->magnitude[i]] = 0;
1647 no_residue[mapping->angle[i]] = 0;
1648 }
1649 }
1650
1651// Decode residue
1652
1653 for (i = 0; i < mapping->submaps; ++i) {
1654 vorbis_residue *residue;
1655 unsigned ch = 0;
1656 int ret;
1657
1658 for (j = 0; j < vc->audio_channels; ++j) {
1659 if ((mapping->submaps == 1) || (i == mapping->mux[j])) {
1660 res_chan[j] = res_num;
1661 if (no_residue[j]) {
1662 do_not_decode[ch] = 1;
1663 } else {
1664 do_not_decode[ch] = 0;
1665 }
1666 ++ch;
1667 ++res_num;
1668 }
1669 }
1670 residue = &vc->residues[mapping->submap_residue[i]];
1671 if (ch_left < ch) {
1672 av_log(vc->avctx, AV_LOG_ERROR, "Too many channels in vorbis_floor_decode.\n");
1673 return AVERROR_INVALIDDATA;
1674 }
1675 if (ch) {
1676 ret = vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, vlen, ch_left);
1677 if (ret < 0)
1678 return ret;
1679 }
1680
1681 ch_res_ptr += ch * vlen;
1682 ch_left -= ch;
1683 }
1684
1685 if (ch_left > 0)
1686 return AVERROR_INVALIDDATA;
1687
1688// Inverse coupling
1689
1690 for (i = mapping->coupling_steps - 1; i >= 0; --i) { //warning: i has to be signed
1691 float *mag, *ang;
1692
1693 mag = vc->channel_residues+res_chan[mapping->magnitude[i]] * blocksize / 2;
1694 ang = vc->channel_residues+res_chan[mapping->angle[i]] * blocksize / 2;
1695 vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize / 2);
1696 }
1697
1698// Dotproduct, MDCT
1699
1700 mdct = &vc->mdct[blockflag];
1701
1702 for (j = vc->audio_channels-1;j >= 0; j--) {
1703 ch_res_ptr = vc->channel_residues + res_chan[j] * blocksize / 2;
1704 vc->fdsp->vector_fmul(floor_ptr[j], floor_ptr[j], ch_res_ptr, blocksize / 2);
1705 mdct->imdct_half(mdct, ch_res_ptr, floor_ptr[j]);
1706 }
1707
1708// Overlap/add, save data for next overlapping
1709
1710 retlen = (blocksize + vc->blocksize[previous_window]) / 4;
1711 for (j = 0; j < vc->audio_channels; j++) {
1712 unsigned bs0 = vc->blocksize[0];
1713 unsigned bs1 = vc->blocksize[1];
1714 float *residue = vc->channel_residues + res_chan[j] * blocksize / 2;
1715 float *saved = vc->saved + j * bs1 / 4;
1716 float *ret = floor_ptr[j];
1717 float *buf = residue;
1718 const float *win = vc->win[blockflag & previous_window];
1719
1720 if (blockflag == previous_window) {
1721 vc->fdsp->vector_fmul_window(ret, saved, buf, win, blocksize / 4);
1722 } else if (blockflag > previous_window) {
1723 vc->fdsp->vector_fmul_window(ret, saved, buf, win, bs0 / 4);
1724 memcpy(ret+bs0/2, buf+bs0/4, ((bs1-bs0)/4) * sizeof(float));
1725 } else {
1726 memcpy(ret, saved, ((bs1 - bs0) / 4) * sizeof(float));
1727 vc->fdsp->vector_fmul_window(ret + (bs1 - bs0) / 4, saved + (bs1 - bs0) / 4, buf, win, bs0 / 4);
1728 }
1729 memcpy(saved, buf + blocksize / 4, blocksize / 4 * sizeof(float));
1730 }
1731
1732 vc->previous_window = blockflag;
1733 return retlen;
1734}
1735
1736// Return the decoded audio packet through the standard api
1737
1738static int vorbis_decode_frame(AVCodecContext *avctx, void *data,
1739 int *got_frame_ptr, AVPacket *avpkt)
1740{
1741 const uint8_t *buf = avpkt->data;
1742 int buf_size = avpkt->size;
1743 vorbis_context *vc = avctx->priv_data;
1744 AVFrame *frame = data;
1745 GetBitContext *gb = &vc->gb;
1746 float *channel_ptrs[255];
1747 int i, len, ret;
1748
1749 ff_dlog(NULL, "packet length %d \n", buf_size);
1750
1751 if (*buf == 1 && buf_size > 7) {
1752 if ((ret = init_get_bits8(gb, buf + 1, buf_size - 1)) < 0)
1753 return ret;
1754
1755 vorbis_free(vc);
1756 if ((ret = vorbis_parse_id_hdr(vc))) {
1757 av_log(avctx, AV_LOG_ERROR, "Id header corrupt.\n");
1758 vorbis_free(vc);
1759 return ret;
1760 }
1761
1762 if (vc->audio_channels > 8)
1763 avctx->channel_layout = 0;
1764 else
1765 avctx->channel_layout = ff_vorbis_channel_layouts[vc->audio_channels - 1];
1766
1767 avctx->channels = vc->audio_channels;
1768 avctx->sample_rate = vc->audio_samplerate;
1769 return buf_size;
1770 }
1771
1772 if (*buf == 3 && buf_size > 7) {
1773 av_log(avctx, AV_LOG_DEBUG, "Ignoring comment header\n");
1774 return buf_size;
1775 }
1776
1777 if (*buf == 5 && buf_size > 7 && vc->channel_residues && !vc->modes) {
1778 if ((ret = init_get_bits8(gb, buf + 1, buf_size - 1)) < 0)
1779 return ret;
1780
1781 if ((ret = vorbis_parse_setup_hdr(vc))) {
1782 av_log(avctx, AV_LOG_ERROR, "Setup header corrupt.\n");
1783 vorbis_free(vc);
1784 return ret;
1785 }
1786 return buf_size;
1787 }
1788
1789 if (!vc->channel_residues || !vc->modes) {
1790 av_log(avctx, AV_LOG_ERROR, "Data packet before valid headers\n");
1791 return AVERROR_INVALIDDATA;
1792 }
1793
1794 /* get output buffer */
1795 frame->nb_samples = vc->blocksize[1] / 2;
1796 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
1797 return ret;
1798
1799 if (vc->audio_channels > 8) {
1800 for (i = 0; i < vc->audio_channels; i++)
1801 channel_ptrs[i] = (float *)frame->extended_data[i];
1802 } else {
1803 for (i = 0; i < vc->audio_channels; i++) {
1804 int ch = ff_vorbis_channel_layout_offsets[vc->audio_channels - 1][i];
1805 channel_ptrs[ch] = (float *)frame->extended_data[i];
1806 }
1807 }
1808
1809 if ((ret = init_get_bits8(gb, buf, buf_size)) < 0)
1810 return ret;
1811
1812 if ((len = vorbis_parse_audio_packet(vc, channel_ptrs)) <= 0)
1813 return len;
1814
1815 if (!vc->first_frame) {
1816 vc->first_frame = 1;
1817 *got_frame_ptr = 0;
1818 av_frame_unref(frame);
1819 return buf_size;
1820 }
1821
1822 ff_dlog(NULL, "parsed %d bytes %d bits, returned %d samples (*ch*bits) \n",
1823 get_bits_count(gb) / 8, get_bits_count(gb) % 8, len);
1824
1825 frame->nb_samples = len;
1826 *got_frame_ptr = 1;
1827
1828 return buf_size;
1829}
1830
1831// Close decoder
1832
1833static av_cold int vorbis_decode_close(AVCodecContext *avctx)
1834{
1835 vorbis_context *vc = avctx->priv_data;
1836
1837 vorbis_free(vc);
1838
1839 return 0;
1840}
1841
1842static av_cold void vorbis_decode_flush(AVCodecContext *avctx)
1843{
1844 vorbis_context *vc = avctx->priv_data;
1845
1846 if (vc->saved) {
1847 memset(vc->saved, 0, (vc->blocksize[1] / 4) * vc->audio_channels *
1848 sizeof(*vc->saved));
1849 }
1850 vc->previous_window = -1;
1851 vc->first_frame = 0;
1852}
1853
1854AVCodec ff_vorbis_decoder = {
1855 .name = "vorbis",
1856 .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),
1857 .type = AVMEDIA_TYPE_AUDIO,
1858 .id = AV_CODEC_ID_VORBIS,
1859 .priv_data_size = sizeof(vorbis_context),
1860 .init = vorbis_decode_init,
1861 .close = vorbis_decode_close,
1862 .decode = vorbis_decode_frame,
1863 .flush = vorbis_decode_flush,
1864 .capabilities = AV_CODEC_CAP_DR1,
1865 .channel_layouts = ff_vorbis_channel_layouts,
1866 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
1867 AV_SAMPLE_FMT_NONE },
1868};
1869
generated by cgit at 2024-05-17 04:44:21 (GMT)