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Imported Debian version 2.5.0~trusty1.1
[deb_ffmpeg.git] / ffmpeg / libavcodec / vorbisdec.c
CommitLineData
2ba45a60
DM		 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#define BITSTREAM_READER_LE
33#include "libavutil/float_dsp.h"
34#include "libavutil/avassert.h"
35#include "avcodec.h"
36#include "get_bits.h"
37#include "fft.h"
38#include "fmtconvert.h"
39#include "internal.h"
40
41#include "vorbis.h"
42#include "vorbisdsp.h"
43#include "xiph.h"
44
45#define V_NB_BITS 8
46#define V_NB_BITS2 11
47#define V_MAX_VLCS (1 << 16)
48#define V_MAX_PARTITIONS (1 << 20)
49
50typedef struct {
51 uint8_t dimensions;
52 uint8_t lookup_type;
53 uint8_t maxdepth;
54 VLC vlc;
55 float *codevectors;
56 unsigned int nb_bits;
57} vorbis_codebook;
58
59typedef union vorbis_floor_u vorbis_floor_data;
60typedef struct vorbis_floor0_s vorbis_floor0;
61typedef struct vorbis_floor1_s vorbis_floor1;
62struct vorbis_context_s;
63typedef
64int (* vorbis_floor_decode_func)
65 (struct vorbis_context_s *, vorbis_floor_data *, float *);
66typedef struct {
67 uint8_t floor_type;
68 vorbis_floor_decode_func decode;
69 union vorbis_floor_u {
70 struct vorbis_floor0_s {
71 uint8_t order;
72 uint16_t rate;
73 uint16_t bark_map_size;
74 int32_t *map[2];
75 uint32_t map_size[2];
76 uint8_t amplitude_bits;
77 uint8_t amplitude_offset;
78 uint8_t num_books;
79 uint8_t *book_list;
80 float *lsp;
81 } t0;
82 struct vorbis_floor1_s {
83 uint8_t partitions;
84 uint8_t partition_class[32];
85 uint8_t class_dimensions[16];
86 uint8_t class_subclasses[16];
87 uint8_t class_masterbook[16];
88 int16_t subclass_books[16][8];
89 uint8_t multiplier;
90 uint16_t x_list_dim;
91 vorbis_floor1_entry *list;
92 } t1;
93 } data;
94} vorbis_floor;
95
96typedef struct {
97 uint16_t type;
98 uint32_t begin;
99 uint32_t end;
100 unsigned partition_size;
101 uint8_t classifications;
102 uint8_t classbook;
103 int16_t books[64][8];
104 uint8_t maxpass;
105 uint16_t ptns_to_read;
106 uint8_t *classifs;
107} vorbis_residue;
108
109typedef struct {
110 uint8_t submaps;
111 uint16_t coupling_steps;
112 uint8_t *magnitude;
113 uint8_t *angle;
114 uint8_t *mux;
115 uint8_t submap_floor[16];
116 uint8_t submap_residue[16];
117} vorbis_mapping;
118
119typedef struct {
120 uint8_t blockflag;
121 uint16_t windowtype;
122 uint16_t transformtype;
123 uint8_t mapping;
124} vorbis_mode;
125
126typedef struct vorbis_context_s {
127 AVCodecContext *avctx;
128 GetBitContext gb;
129 VorbisDSPContext dsp;
f6fa7814 130 AVFloatDSPContext *fdsp;
2ba45a60
DM		 131 FmtConvertContext fmt_conv;
132
133 FFTContext mdct[2];
134 uint8_t first_frame;
135 uint32_t version;
136 uint8_t audio_channels;
137 uint32_t audio_samplerate;
138 uint32_t bitrate_maximum;
139 uint32_t bitrate_nominal;
140 uint32_t bitrate_minimum;
141 uint32_t blocksize[2];
142 const float *win[2];
143 uint16_t codebook_count;
144 vorbis_codebook *codebooks;
145 uint8_t floor_count;
146 vorbis_floor *floors;
147 uint8_t residue_count;
148 vorbis_residue *residues;
149 uint8_t mapping_count;
150 vorbis_mapping *mappings;
151 uint8_t mode_count;
152 vorbis_mode *modes;
153 uint8_t mode_number; // mode number for the current packet
154 int8_t previous_window;
155 float *channel_residues;
156 float *saved;
157} vorbis_context;
158
159/* Helper functions */
160
161#define BARK(x) \
162 (13.1f * atan(0.00074f * (x)) + 2.24f * atan(1.85e-8f * (x) * (x)) + 1e-4f * (x))
163
164static const char idx_err_str[] = "Index value %d out of range (0 - %d) for %s at %s:%i\n";
165#define VALIDATE_INDEX(idx, limit) \
166 if (idx >= limit) {\
167 av_log(vc->avctx, AV_LOG_ERROR,\
168 idx_err_str,\
169 (int)(idx), (int)(limit - 1), #idx, __FILE__, __LINE__);\
170 return AVERROR_INVALIDDATA;\
171 }
172#define GET_VALIDATED_INDEX(idx, bits, limit) \
173 {\
174 idx = get_bits(gb, bits);\
175 VALIDATE_INDEX(idx, limit)\
176 }
177
178static float vorbisfloat2float(unsigned val)
179{
180 double mant = val & 0x1fffff;
181 long exp = (val & 0x7fe00000L) >> 21;
182 if (val & 0x80000000)
183 mant = -mant;
184 return ldexp(mant, exp - 20 - 768);
185}
186
187
188// Free all allocated memory -----------------------------------------
189
190static void vorbis_free(vorbis_context *vc)
191{
192 int i;
193
194 av_freep(&vc->channel_residues);
195 av_freep(&vc->saved);
f6fa7814 196 av_freep(&vc->fdsp);
2ba45a60
DM		 197
198 if (vc->residues)
199 for (i = 0; i < vc->residue_count; i++)
f6fa7814 200 av_freep(&vc->residues[i].classifs);
2ba45a60
DM		 201 av_freep(&vc->residues);
202 av_freep(&vc->modes);
203
204 ff_mdct_end(&vc->mdct[0]);
205 ff_mdct_end(&vc->mdct[1]);
206
207 if (vc->codebooks)
208 for (i = 0; i < vc->codebook_count; ++i) {
f6fa7814 209 av_freep(&vc->codebooks[i].codevectors);
2ba45a60
DM		 210 ff_free_vlc(&vc->codebooks[i].vlc);
211 }
212 av_freep(&vc->codebooks);
213
214 if (vc->floors)
215 for (i = 0; i < vc->floor_count; ++i) {
216 if (vc->floors[i].floor_type == 0) {
f6fa7814
DM		 217 av_freep(&vc->floors[i].data.t0.map[0]);
218 av_freep(&vc->floors[i].data.t0.map[1]);
219 av_freep(&vc->floors[i].data.t0.book_list);
220 av_freep(&vc->floors[i].data.t0.lsp);
2ba45a60 221 } else {
f6fa7814 222 av_freep(&vc->floors[i].data.t1.list);
2ba45a60
DM		 223 }
224 }
225 av_freep(&vc->floors);
226
227 if (vc->mappings)
228 for (i = 0; i < vc->mapping_count; ++i) {
f6fa7814
DM		 229 av_freep(&vc->mappings[i].magnitude);
230 av_freep(&vc->mappings[i].angle);
231 av_freep(&vc->mappings[i].mux);
2ba45a60
DM		 232 }
233 av_freep(&vc->mappings);
234}
235
236// Parse setup header -------------------------------------------------
237
238// Process codebooks part
239
240static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc)
241{
242 unsigned cb;
243 uint8_t *tmp_vlc_bits = NULL;
244 uint32_t *tmp_vlc_codes = NULL;
245 GetBitContext *gb = &vc->gb;
246 uint16_t *codebook_multiplicands = NULL;
247 int ret = 0;
248
249 vc->codebook_count = get_bits(gb, 8) + 1;
250
251 av_dlog(NULL, " Codebooks: %d \n", vc->codebook_count);
252
253 vc->codebooks = av_mallocz(vc->codebook_count * sizeof(*vc->codebooks));
254 tmp_vlc_bits = av_mallocz(V_MAX_VLCS * sizeof(*tmp_vlc_bits));
255 tmp_vlc_codes = av_mallocz(V_MAX_VLCS * sizeof(*tmp_vlc_codes));
256 codebook_multiplicands = av_malloc(V_MAX_VLCS * sizeof(*codebook_multiplicands));
257 if (!vc->codebooks ||
258 !tmp_vlc_bits || !tmp_vlc_codes || !codebook_multiplicands) {
259 ret = AVERROR(ENOMEM);
260 goto error;
261 }
262
263 for (cb = 0; cb < vc->codebook_count; ++cb) {
264 vorbis_codebook *codebook_setup = &vc->codebooks[cb];
265 unsigned ordered, t, entries, used_entries = 0;
266
267 av_dlog(NULL, " %u. Codebook\n", cb);
268
269 if (get_bits(gb, 24) != 0x564342) {
270 av_log(vc->avctx, AV_LOG_ERROR,
271 " %u. Codebook setup data corrupt.\n", cb);
272 ret = AVERROR_INVALIDDATA;
273 goto error;
274 }
275
276 codebook_setup->dimensions=get_bits(gb, 16);
277 if (codebook_setup->dimensions > 16 || codebook_setup->dimensions == 0) {
278 av_log(vc->avctx, AV_LOG_ERROR,
279 " %u. Codebook's dimension is invalid (%d).\n",
280 cb, codebook_setup->dimensions);
281 ret = AVERROR_INVALIDDATA;
282 goto error;
283 }
284 entries = get_bits(gb, 24);
285 if (entries > V_MAX_VLCS) {
286 av_log(vc->avctx, AV_LOG_ERROR,
287 " %u. Codebook has too many entries (%u).\n",
288 cb, entries);
289 ret = AVERROR_INVALIDDATA;
290 goto error;
291 }
292
293 ordered = get_bits1(gb);
294
295 av_dlog(NULL, " codebook_dimensions %d, codebook_entries %u\n",
296 codebook_setup->dimensions, entries);
297
298 if (!ordered) {
299 unsigned ce, flag;
300 unsigned sparse = get_bits1(gb);
301
302 av_dlog(NULL, " not ordered \n");
303
304 if (sparse) {
305 av_dlog(NULL, " sparse \n");
306
307 used_entries = 0;
308 for (ce = 0; ce < entries; ++ce) {
309 flag = get_bits1(gb);
310 if (flag) {
311 tmp_vlc_bits[ce] = get_bits(gb, 5) + 1;
312 ++used_entries;
313 } else
314 tmp_vlc_bits[ce] = 0;
315 }
316 } else {
317 av_dlog(NULL, " not sparse \n");
318
319 used_entries = entries;
320 for (ce = 0; ce < entries; ++ce)
321 tmp_vlc_bits[ce] = get_bits(gb, 5) + 1;
322 }
323 } else {
324 unsigned current_entry = 0;
325 unsigned current_length = get_bits(gb, 5) + 1;
326
327 av_dlog(NULL, " ordered, current length: %u\n", current_length); //FIXME
328
329 used_entries = entries;
330 for (; current_entry < used_entries && current_length <= 32; ++current_length) {
331 unsigned i, number;
332
333 av_dlog(NULL, " number bits: %u ", ilog(entries - current_entry));
334
335 number = get_bits(gb, ilog(entries - current_entry));
336
337 av_dlog(NULL, " number: %u\n", number);
338
339 for (i = current_entry; i < number+current_entry; ++i)
340 if (i < used_entries)
341 tmp_vlc_bits[i] = current_length;
342
343 current_entry+=number;
344 }
345 if (current_entry>used_entries) {
346 av_log(vc->avctx, AV_LOG_ERROR, " More codelengths than codes in codebook. \n");
347 ret = AVERROR_INVALIDDATA;
348 goto error;
349 }
350 }
351
352 codebook_setup->lookup_type = get_bits(gb, 4);
353
354 av_dlog(NULL, " lookup type: %d : %s \n", codebook_setup->lookup_type,
355 codebook_setup->lookup_type ? "vq" : "no lookup");
356
357// If the codebook is used for (inverse) VQ, calculate codevectors.
358
359 if (codebook_setup->lookup_type == 1) {
360 unsigned i, j, k;
361 unsigned codebook_lookup_values = ff_vorbis_nth_root(entries, codebook_setup->dimensions);
362
363 float codebook_minimum_value = vorbisfloat2float(get_bits_long(gb, 32));
364 float codebook_delta_value = vorbisfloat2float(get_bits_long(gb, 32));
365 unsigned codebook_value_bits = get_bits(gb, 4) + 1;
366 unsigned codebook_sequence_p = get_bits1(gb);
367
368 av_dlog(NULL, " We expect %d numbers for building the codevectors. \n",
369 codebook_lookup_values);
370 av_dlog(NULL, " delta %f minmum %f \n",
371 codebook_delta_value, codebook_minimum_value);
372
373 for (i = 0; i < codebook_lookup_values; ++i) {
374 codebook_multiplicands[i] = get_bits(gb, codebook_value_bits);
375
376 av_dlog(NULL, " multiplicands*delta+minmum : %e \n",
377 (float)codebook_multiplicands[i] * codebook_delta_value + codebook_minimum_value);
378 av_dlog(NULL, " multiplicand %u\n", codebook_multiplicands[i]);
379 }
380
381// Weed out unused vlcs and build codevector vector
382 codebook_setup->codevectors = used_entries ? av_mallocz_array(used_entries,
383 codebook_setup->dimensions *
384 sizeof(*codebook_setup->codevectors))
385 : NULL;
386 for (j = 0, i = 0; i < entries; ++i) {
387 unsigned dim = codebook_setup->dimensions;
388
389 if (tmp_vlc_bits[i]) {
390 float last = 0.0;
391 unsigned lookup_offset = i;
392
393 av_dlog(vc->avctx, "Lookup offset %u ,", i);
394
395 for (k = 0; k < dim; ++k) {
396 unsigned multiplicand_offset = lookup_offset % codebook_lookup_values;
397 codebook_setup->codevectors[j * dim + k] = codebook_multiplicands[multiplicand_offset] * codebook_delta_value + codebook_minimum_value + last;
398 if (codebook_sequence_p)
399 last = codebook_setup->codevectors[j * dim + k];
400 lookup_offset/=codebook_lookup_values;
401 }
402 tmp_vlc_bits[j] = tmp_vlc_bits[i];
403
404 av_dlog(vc->avctx, "real lookup offset %u, vector: ", j);
405 for (k = 0; k < dim; ++k)
406 av_dlog(vc->avctx, " %f ",
407 codebook_setup->codevectors[j * dim + k]);
408 av_dlog(vc->avctx, "\n");
409
410 ++j;
411 }
412 }
413 if (j != used_entries) {
414 av_log(vc->avctx, AV_LOG_ERROR, "Bug in codevector vector building code. \n");
415 ret = AVERROR_INVALIDDATA;
416 goto error;
417 }
418 entries = used_entries;
419 } else if (codebook_setup->lookup_type >= 2) {
420 av_log(vc->avctx, AV_LOG_ERROR, "Codebook lookup type not supported. \n");
421 ret = AVERROR_INVALIDDATA;
422 goto error;
423 }
424
425// Initialize VLC table
426 if (ff_vorbis_len2vlc(tmp_vlc_bits, tmp_vlc_codes, entries)) {
427 av_log(vc->avctx, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");
428 ret = AVERROR_INVALIDDATA;
429 goto error;
430 }
431 codebook_setup->maxdepth = 0;
432 for (t = 0; t < entries; ++t)
433 if (tmp_vlc_bits[t] >= codebook_setup->maxdepth)
434 codebook_setup->maxdepth = tmp_vlc_bits[t];
435
436 if (codebook_setup->maxdepth > 3 * V_NB_BITS)
437 codebook_setup->nb_bits = V_NB_BITS2;
438 else
439 codebook_setup->nb_bits = V_NB_BITS;
440
441 codebook_setup->maxdepth = (codebook_setup->maxdepth+codebook_setup->nb_bits - 1) / codebook_setup->nb_bits;
442
443 if ((ret = init_vlc(&codebook_setup->vlc, codebook_setup->nb_bits,
444 entries, tmp_vlc_bits, sizeof(*tmp_vlc_bits),
445 sizeof(*tmp_vlc_bits), tmp_vlc_codes,
446 sizeof(*tmp_vlc_codes), sizeof(*tmp_vlc_codes),
447 INIT_VLC_LE))) {
448 av_log(vc->avctx, AV_LOG_ERROR, " Error generating vlc tables. \n");
449 goto error;
450 }
451 }
452
453 av_free(tmp_vlc_bits);
454 av_free(tmp_vlc_codes);
455 av_free(codebook_multiplicands);
456 return 0;
457
458// Error:
459error:
460 av_free(tmp_vlc_bits);
461 av_free(tmp_vlc_codes);
462 av_free(codebook_multiplicands);
463 return ret;
464}
465
466// Process time domain transforms part (unused in Vorbis I)
467
468static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc)
469{
470 GetBitContext *gb = &vc->gb;
471 unsigned i, vorbis_time_count = get_bits(gb, 6) + 1;
472
473 for (i = 0; i < vorbis_time_count; ++i) {
474 unsigned vorbis_tdtransform = get_bits(gb, 16);
475
476 av_dlog(NULL, " Vorbis time domain transform %u: %u\n",
477 vorbis_time_count, vorbis_tdtransform);
478
479 if (vorbis_tdtransform) {
480 av_log(vc->avctx, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n");
481 return AVERROR_INVALIDDATA;
482 }
483 }
484 return 0;
485}
486
487// Process floors part
488
489static int vorbis_floor0_decode(vorbis_context *vc,
490 vorbis_floor_data *vfu, float *vec);
491static int create_map(vorbis_context *vc, unsigned floor_number);
492static int vorbis_floor1_decode(vorbis_context *vc,
493 vorbis_floor_data *vfu, float *vec);
494static int vorbis_parse_setup_hdr_floors(vorbis_context *vc)
495{
496 GetBitContext *gb = &vc->gb;
497 int i, j, k, ret;
498
499 vc->floor_count = get_bits(gb, 6) + 1;
500
501 vc->floors = av_mallocz(vc->floor_count * sizeof(*vc->floors));
502 if (!vc->floors)
503 return AVERROR(ENOMEM);
504
505 for (i = 0; i < vc->floor_count; ++i) {
506 vorbis_floor *floor_setup = &vc->floors[i];
507
508 floor_setup->floor_type = get_bits(gb, 16);
509
510 av_dlog(NULL, " %d. floor type %d \n", i, floor_setup->floor_type);
511
512 if (floor_setup->floor_type == 1) {
513 int maximum_class = -1;
514 unsigned rangebits, rangemax, floor1_values = 2;
515
516 floor_setup->decode = vorbis_floor1_decode;
517
518 floor_setup->data.t1.partitions = get_bits(gb, 5);
519
520 av_dlog(NULL, " %d.floor: %d partitions \n",
521 i, floor_setup->data.t1.partitions);
522
523 for (j = 0; j < floor_setup->data.t1.partitions; ++j) {
524 floor_setup->data.t1.partition_class[j] = get_bits(gb, 4);
525 if (floor_setup->data.t1.partition_class[j] > maximum_class)
526 maximum_class = floor_setup->data.t1.partition_class[j];
527
528 av_dlog(NULL, " %d. floor %d partition class %d \n",
529 i, j, floor_setup->data.t1.partition_class[j]);
530
531 }
532
533 av_dlog(NULL, " maximum class %d \n", maximum_class);
534
535 for (j = 0; j <= maximum_class; ++j) {
536 floor_setup->data.t1.class_dimensions[j] = get_bits(gb, 3) + 1;
537 floor_setup->data.t1.class_subclasses[j] = get_bits(gb, 2);
538
539 av_dlog(NULL, " %d floor %d class dim: %d subclasses %d \n", i, j,
540 floor_setup->data.t1.class_dimensions[j],
541 floor_setup->data.t1.class_subclasses[j]);
542
543 if (floor_setup->data.t1.class_subclasses[j]) {
544 GET_VALIDATED_INDEX(floor_setup->data.t1.class_masterbook[j], 8, vc->codebook_count)
545
546 av_dlog(NULL, " masterbook: %d \n", floor_setup->data.t1.class_masterbook[j]);
547 }
548
549 for (k = 0; k < (1 << floor_setup->data.t1.class_subclasses[j]); ++k) {
550 int16_t bits = get_bits(gb, 8) - 1;
551 if (bits != -1)
552 VALIDATE_INDEX(bits, vc->codebook_count)
553 floor_setup->data.t1.subclass_books[j][k] = bits;
554
555 av_dlog(NULL, " book %d. : %d \n", k, floor_setup->data.t1.subclass_books[j][k]);
556 }
557 }
558
559 floor_setup->data.t1.multiplier = get_bits(gb, 2) + 1;
560 floor_setup->data.t1.x_list_dim = 2;
561
562 for (j = 0; j < floor_setup->data.t1.partitions; ++j)
563 floor_setup->data.t1.x_list_dim+=floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];
564
565 floor_setup->data.t1.list = av_mallocz_array(floor_setup->data.t1.x_list_dim,
566 sizeof(*floor_setup->data.t1.list));
567 if (!floor_setup->data.t1.list)
568 return AVERROR(ENOMEM);
569
570 rangebits = get_bits(gb, 4);
571 rangemax = (1 << rangebits);
572 if (rangemax > vc->blocksize[1] / 2) {
573 av_log(vc->avctx, AV_LOG_ERROR,
574 "Floor value is too large for blocksize: %u (%"PRIu32")\n",
575 rangemax, vc->blocksize[1] / 2);
576 return AVERROR_INVALIDDATA;
577 }
578 floor_setup->data.t1.list[0].x = 0;
579 floor_setup->data.t1.list[1].x = rangemax;
580
581 for (j = 0; j < floor_setup->data.t1.partitions; ++j) {
582 for (k = 0; k < floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]]; ++k, ++floor1_values) {
583 floor_setup->data.t1.list[floor1_values].x = get_bits(gb, rangebits);
584
585 av_dlog(NULL, " %u. floor1 Y coord. %d\n", floor1_values,
586 floor_setup->data.t1.list[floor1_values].x);
587 }
588 }
589
590// Precalculate order of x coordinates - needed for decode
591 if (ff_vorbis_ready_floor1_list(vc->avctx,
592 floor_setup->data.t1.list,
593 floor_setup->data.t1.x_list_dim)) {
594 return AVERROR_INVALIDDATA;
595 }
596 } else if (floor_setup->floor_type == 0) {
597 unsigned max_codebook_dim = 0;
598
599 floor_setup->decode = vorbis_floor0_decode;
600
601 floor_setup->data.t0.order = get_bits(gb, 8);
602 if (!floor_setup->data.t0.order) {
603 av_log(vc->avctx, AV_LOG_ERROR, "Floor 0 order is 0.\n");
604 return AVERROR_INVALIDDATA;
605 }
606 floor_setup->data.t0.rate = get_bits(gb, 16);
607 if (!floor_setup->data.t0.rate) {
608 av_log(vc->avctx, AV_LOG_ERROR, "Floor 0 rate is 0.\n");
609 return AVERROR_INVALIDDATA;
610 }
611 floor_setup->data.t0.bark_map_size = get_bits(gb, 16);
612 if (!floor_setup->data.t0.bark_map_size) {
613 av_log(vc->avctx, AV_LOG_ERROR,
614 "Floor 0 bark map size is 0.\n");
615 return AVERROR_INVALIDDATA;
616 }
617 floor_setup->data.t0.amplitude_bits = get_bits(gb, 6);
618 floor_setup->data.t0.amplitude_offset = get_bits(gb, 8);
619 floor_setup->data.t0.num_books = get_bits(gb, 4) + 1;
620
621 /* allocate mem for booklist */
622 floor_setup->data.t0.book_list =
623 av_malloc(floor_setup->data.t0.num_books);
624 if (!floor_setup->data.t0.book_list)
625 return AVERROR(ENOMEM);
626 /* read book indexes */
627 {
628 int idx;
629 unsigned book_idx;
630 for (idx = 0; idx < floor_setup->data.t0.num_books; ++idx) {
631 GET_VALIDATED_INDEX(book_idx, 8, vc->codebook_count)
632 floor_setup->data.t0.book_list[idx] = book_idx;
633 if (vc->codebooks[book_idx].dimensions > max_codebook_dim)
634 max_codebook_dim = vc->codebooks[book_idx].dimensions;
635 }
636 }
637
638 if ((ret = create_map(vc, i)) < 0)
639 return ret;
640
641 /* codebook dim is for padding if codebook dim doesn't *
642 * divide order+1 then we need to read more data */
643 floor_setup->data.t0.lsp =
644 av_malloc_array((floor_setup->data.t0.order + 1 + max_codebook_dim),
645 sizeof(*floor_setup->data.t0.lsp));
646 if (!floor_setup->data.t0.lsp)
647 return AVERROR(ENOMEM);
648
649 /* debug output parsed headers */
650 av_dlog(NULL, "floor0 order: %u\n", floor_setup->data.t0.order);
651 av_dlog(NULL, "floor0 rate: %u\n", floor_setup->data.t0.rate);
652 av_dlog(NULL, "floor0 bark map size: %u\n",
653 floor_setup->data.t0.bark_map_size);
654 av_dlog(NULL, "floor0 amplitude bits: %u\n",
655 floor_setup->data.t0.amplitude_bits);
656 av_dlog(NULL, "floor0 amplitude offset: %u\n",
657 floor_setup->data.t0.amplitude_offset);
658 av_dlog(NULL, "floor0 number of books: %u\n",
659 floor_setup->data.t0.num_books);
660 av_dlog(NULL, "floor0 book list pointer: %p\n",
661 floor_setup->data.t0.book_list);
662 {
663 int idx;
664 for (idx = 0; idx < floor_setup->data.t0.num_books; ++idx) {
665 av_dlog(NULL, " Book %d: %u\n", idx + 1,
666 floor_setup->data.t0.book_list[idx]);
667 }
668 }
669 } else {
670 av_log(vc->avctx, AV_LOG_ERROR, "Invalid floor type!\n");
671 return AVERROR_INVALIDDATA;
672 }
673 }
674 return 0;
675}
676
677// Process residues part
678
679static int vorbis_parse_setup_hdr_residues(vorbis_context *vc)
680{
681 GetBitContext *gb = &vc->gb;
682 unsigned i, j, k;
683
684 vc->residue_count = get_bits(gb, 6)+1;
685 vc->residues = av_mallocz(vc->residue_count * sizeof(*vc->residues));
686 if (!vc->residues)
687 return AVERROR(ENOMEM);
688
689 av_dlog(NULL, " There are %d residues. \n", vc->residue_count);
690
691 for (i = 0; i < vc->residue_count; ++i) {
692 vorbis_residue *res_setup = &vc->residues[i];
693 uint8_t cascade[64];
694 unsigned high_bits, low_bits;
695
696 res_setup->type = get_bits(gb, 16);
697
698 av_dlog(NULL, " %u. residue type %d\n", i, res_setup->type);
699
700 res_setup->begin = get_bits(gb, 24);
701 res_setup->end = get_bits(gb, 24);
702 res_setup->partition_size = get_bits(gb, 24) + 1;
703 /* Validations to prevent a buffer overflow later. */
704 if (res_setup->begin>res_setup->end ||
705 (res_setup->end-res_setup->begin) / res_setup->partition_size > FFMIN(V_MAX_PARTITIONS, 65535)) {
706 av_log(vc->avctx, AV_LOG_ERROR,
707 "partition out of bounds: type, begin, end, size, blocksize: %"PRIu16", %"PRIu32", %"PRIu32", %u, %"PRIu32"\n",
708 res_setup->type, res_setup->begin, res_setup->end,
709 res_setup->partition_size, vc->blocksize[1] / 2);
710 return AVERROR_INVALIDDATA;
711 }
712
713 res_setup->classifications = get_bits(gb, 6) + 1;
714 GET_VALIDATED_INDEX(res_setup->classbook, 8, vc->codebook_count)
715
716 res_setup->ptns_to_read =
717 (res_setup->end - res_setup->begin) / res_setup->partition_size;
718 res_setup->classifs = av_malloc_array(res_setup->ptns_to_read,
719 vc->audio_channels *
720 sizeof(*res_setup->classifs));
721 if (!res_setup->classifs)
722 return AVERROR(ENOMEM);
723
724 av_dlog(NULL, " begin %d end %d part.size %d classif.s %d classbook %d \n",
725 res_setup->begin, res_setup->end, res_setup->partition_size,
726 res_setup->classifications, res_setup->classbook);
727
728 for (j = 0; j < res_setup->classifications; ++j) {
729 high_bits = 0;
730 low_bits = get_bits(gb, 3);
731 if (get_bits1(gb))
732 high_bits = get_bits(gb, 5);
733 cascade[j] = (high_bits << 3) + low_bits;
734
735 av_dlog(NULL, " %u class cascade depth: %d\n", j, ilog(cascade[j]));
736 }
737
738 res_setup->maxpass = 0;
739 for (j = 0; j < res_setup->classifications; ++j) {
740 for (k = 0; k < 8; ++k) {
741 if (cascade[j]&(1 << k)) {
742 GET_VALIDATED_INDEX(res_setup->books[j][k], 8, vc->codebook_count)
743
744 av_dlog(NULL, " %u class cascade depth %u book: %d\n",
745 j, k, res_setup->books[j][k]);
746
747 if (k>res_setup->maxpass)
748 res_setup->maxpass = k;
749 } else {
750 res_setup->books[j][k] = -1;
751 }
752 }
753 }
754 }
755 return 0;
756}
757
758// Process mappings part
759
760static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc)
761{
762 GetBitContext *gb = &vc->gb;
763 unsigned i, j;
764
765 vc->mapping_count = get_bits(gb, 6)+1;
766 vc->mappings = av_mallocz(vc->mapping_count * sizeof(*vc->mappings));
767 if (!vc->mappings)
768 return AVERROR(ENOMEM);
769
770 av_dlog(NULL, " There are %d mappings. \n", vc->mapping_count);
771
772 for (i = 0; i < vc->mapping_count; ++i) {
773 vorbis_mapping *mapping_setup = &vc->mappings[i];
774
775 if (get_bits(gb, 16)) {
776 av_log(vc->avctx, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n");
777 return AVERROR_INVALIDDATA;
778 }
779 if (get_bits1(gb)) {
780 mapping_setup->submaps = get_bits(gb, 4) + 1;
781 } else {
782 mapping_setup->submaps = 1;
783 }
784
785 if (get_bits1(gb)) {
786 mapping_setup->coupling_steps = get_bits(gb, 8) + 1;
787 mapping_setup->magnitude = av_mallocz(mapping_setup->coupling_steps *
788 sizeof(*mapping_setup->magnitude));
789 mapping_setup->angle = av_mallocz(mapping_setup->coupling_steps *
790 sizeof(*mapping_setup->angle));
791 if (!mapping_setup->angle || !mapping_setup->magnitude)
792 return AVERROR(ENOMEM);
793
794 for (j = 0; j < mapping_setup->coupling_steps; ++j) {
795 GET_VALIDATED_INDEX(mapping_setup->magnitude[j], ilog(vc->audio_channels - 1), vc->audio_channels)
796 GET_VALIDATED_INDEX(mapping_setup->angle[j], ilog(vc->audio_channels - 1), vc->audio_channels)
797 }
798 } else {
799 mapping_setup->coupling_steps = 0;
800 }
801
802 av_dlog(NULL, " %u mapping coupling steps: %d\n",
803 i, mapping_setup->coupling_steps);
804
805 if (get_bits(gb, 2)) {
806 av_log(vc->avctx, AV_LOG_ERROR, "%u. mapping setup data invalid.\n", i);
807 return AVERROR_INVALIDDATA; // following spec.
808 }
809
810 if (mapping_setup->submaps>1) {
811 mapping_setup->mux = av_mallocz_array(vc->audio_channels,
812 sizeof(*mapping_setup->mux));
813 if (!mapping_setup->mux)
814 return AVERROR(ENOMEM);
815
816 for (j = 0; j < vc->audio_channels; ++j)
817 mapping_setup->mux[j] = get_bits(gb, 4);
818 }
819
820 for (j = 0; j < mapping_setup->submaps; ++j) {
821 skip_bits(gb, 8); // FIXME check?
822 GET_VALIDATED_INDEX(mapping_setup->submap_floor[j], 8, vc->floor_count)
823 GET_VALIDATED_INDEX(mapping_setup->submap_residue[j], 8, vc->residue_count)
824
825 av_dlog(NULL, " %u mapping %u submap : floor %d, residue %d\n", i, j,
826 mapping_setup->submap_floor[j],
827 mapping_setup->submap_residue[j]);
828 }
829 }
830 return 0;
831}
832
833// Process modes part
834
835static int create_map(vorbis_context *vc, unsigned floor_number)
836{
837 vorbis_floor *floors = vc->floors;
838 vorbis_floor0 *vf;
839 int idx;
840 int blockflag, n;
841 int32_t *map;
842
843 for (blockflag = 0; blockflag < 2; ++blockflag) {
844 n = vc->blocksize[blockflag] / 2;
845 floors[floor_number].data.t0.map[blockflag] =
846 av_malloc_array(n + 1, sizeof(int32_t)); // n + sentinel
847 if (!floors[floor_number].data.t0.map[blockflag])
848 return AVERROR(ENOMEM);
849
850 map = floors[floor_number].data.t0.map[blockflag];
851 vf = &floors[floor_number].data.t0;
852
853 for (idx = 0; idx < n; ++idx) {
854 map[idx] = floor(BARK((vf->rate * idx) / (2.0f * n)) *
855 (vf->bark_map_size / BARK(vf->rate / 2.0f)));
856 if (vf->bark_map_size-1 < map[idx])
857 map[idx] = vf->bark_map_size - 1;
858 }
859 map[n] = -1;
860 vf->map_size[blockflag] = n;
861 }
862
863 for (idx = 0; idx <= n; ++idx) {
864 av_dlog(NULL, "floor0 map: map at pos %d is %d\n", idx, map[idx]);
865 }
866
867 return 0;
868}
869
870static int vorbis_parse_setup_hdr_modes(vorbis_context *vc)
871{
872 GetBitContext *gb = &vc->gb;
873 unsigned i;
874
875 vc->mode_count = get_bits(gb, 6) + 1;
876 vc->modes = av_mallocz(vc->mode_count * sizeof(*vc->modes));
877 if (!vc->modes)
878 return AVERROR(ENOMEM);
879
880 av_dlog(NULL, " There are %d modes.\n", vc->mode_count);
881
882 for (i = 0; i < vc->mode_count; ++i) {
883 vorbis_mode *mode_setup = &vc->modes[i];
884
885 mode_setup->blockflag = get_bits1(gb);
886 mode_setup->windowtype = get_bits(gb, 16); //FIXME check
887 mode_setup->transformtype = get_bits(gb, 16); //FIXME check
888 GET_VALIDATED_INDEX(mode_setup->mapping, 8, vc->mapping_count);
889
890 av_dlog(NULL, " %u mode: blockflag %d, windowtype %d, transformtype %d, mapping %d\n",
891 i, mode_setup->blockflag, mode_setup->windowtype,
892 mode_setup->transformtype, mode_setup->mapping);
893 }
894 return 0;
895}
896
897// Process the whole setup header using the functions above
898
899static int vorbis_parse_setup_hdr(vorbis_context *vc)
900{
901 GetBitContext *gb = &vc->gb;
902 int ret;
903
904 if ((get_bits(gb, 8) != 'v') || (get_bits(gb, 8) != 'o') ||
905 (get_bits(gb, 8) != 'r') || (get_bits(gb, 8) != 'b') ||
906 (get_bits(gb, 8) != 'i') || (get_bits(gb, 8) != 's')) {
907 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n");
908 return AVERROR_INVALIDDATA;
909 }
910
911 if ((ret = vorbis_parse_setup_hdr_codebooks(vc))) {
912 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n");
913 return ret;
914 }
915 if ((ret = vorbis_parse_setup_hdr_tdtransforms(vc))) {
916 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n");
917 return ret;
918 }
919 if ((ret = vorbis_parse_setup_hdr_floors(vc))) {
920 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n");
921 return ret;
922 }
923 if ((ret = vorbis_parse_setup_hdr_residues(vc))) {
924 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n");
925 return ret;
926 }
927 if ((ret = vorbis_parse_setup_hdr_mappings(vc))) {
928 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n");
929 return ret;
930 }
931 if ((ret = vorbis_parse_setup_hdr_modes(vc))) {
932 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n");
933 return ret;
934 }
935 if (!get_bits1(gb)) {
936 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n");
937 return AVERROR_INVALIDDATA; // framing flag bit unset error
938 }
939
940 return 0;
941}
942
943// Process the identification header
944
945static int vorbis_parse_id_hdr(vorbis_context *vc)
946{
947 GetBitContext *gb = &vc->gb;
948 unsigned bl0, bl1;
949
950 if ((get_bits(gb, 8) != 'v') || (get_bits(gb, 8) != 'o') ||
951 (get_bits(gb, 8) != 'r') || (get_bits(gb, 8) != 'b') ||
952 (get_bits(gb, 8) != 'i') || (get_bits(gb, 8) != 's')) {
953 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n");
954 return AVERROR_INVALIDDATA;
955 }
956
957 vc->version = get_bits_long(gb, 32); //FIXME check 0
958 vc->audio_channels = get_bits(gb, 8);
959 if (vc->audio_channels <= 0) {
960 av_log(vc->avctx, AV_LOG_ERROR, "Invalid number of channels\n");
961 return AVERROR_INVALIDDATA;
962 }
963 vc->audio_samplerate = get_bits_long(gb, 32);
964 if (vc->audio_samplerate <= 0) {
965 av_log(vc->avctx, AV_LOG_ERROR, "Invalid samplerate\n");
966 return AVERROR_INVALIDDATA;
967 }
968 vc->bitrate_maximum = get_bits_long(gb, 32);
969 vc->bitrate_nominal = get_bits_long(gb, 32);
970 vc->bitrate_minimum = get_bits_long(gb, 32);
971 bl0 = get_bits(gb, 4);
972 bl1 = get_bits(gb, 4);
973 if (bl0 > 13 || bl0 < 6 || bl1 > 13 || bl1 < 6 || bl1 < bl0) {
974 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n");
975 return AVERROR_INVALIDDATA;
976 }
977 vc->blocksize[0] = (1 << bl0);
978 vc->blocksize[1] = (1 << bl1);
979 vc->win[0] = ff_vorbis_vwin[bl0 - 6];
980 vc->win[1] = ff_vorbis_vwin[bl1 - 6];
981
982 if ((get_bits1(gb)) == 0) {
983 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n");
984 return AVERROR_INVALIDDATA;
985 }
986
987 vc->channel_residues = av_malloc_array(vc->blocksize[1] / 2, vc->audio_channels * sizeof(*vc->channel_residues));
988 vc->saved = av_mallocz_array(vc->blocksize[1] / 4, vc->audio_channels * sizeof(*vc->saved));
989 if (!vc->channel_residues || !vc->saved)
990 return AVERROR(ENOMEM);
991
992 vc->previous_window = -1;
993
994 ff_mdct_init(&vc->mdct[0], bl0, 1, -1.0);
995 ff_mdct_init(&vc->mdct[1], bl1, 1, -1.0);
f6fa7814
DM		 996 vc->fdsp = avpriv_float_dsp_alloc(vc->avctx->flags & CODEC_FLAG_BITEXACT);
997 if (!vc->fdsp)
998 return AVERROR(ENOMEM);
2ba45a60
DM		 999
1000 av_dlog(NULL, " vorbis version %d \n audio_channels %d \n audio_samplerate %d \n bitrate_max %d \n bitrate_nom %d \n bitrate_min %d \n blk_0 %d blk_1 %d \n ",
1001 vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize[0], vc->blocksize[1]);
1002
1003/*
1004 BLK = vc->blocksize[0];
1005 for (i = 0; i < BLK / 2; ++i) {
1006 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)));
1007 }
1008*/
1009
1010 return 0;
1011}
1012
1013// Process the extradata using the functions above (identification header, setup header)
1014
1015static av_cold int vorbis_decode_init(AVCodecContext *avctx)
1016{
1017 vorbis_context *vc = avctx->priv_data;
1018 uint8_t *headers = avctx->extradata;
1019 int headers_len = avctx->extradata_size;
1020 uint8_t *header_start[3];
1021 int header_len[3];
1022 GetBitContext *gb = &vc->gb;
1023 int hdr_type, ret;
1024
1025 vc->avctx = avctx;
1026 ff_vorbisdsp_init(&vc->dsp);
2ba45a60
DM		 1027 ff_fmt_convert_init(&vc->fmt_conv, avctx);
1028
1029 avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
1030
1031 if (!headers_len) {
1032 av_log(avctx, AV_LOG_ERROR, "Extradata missing.\n");
1033 return AVERROR_INVALIDDATA;
1034 }
1035
1036 if ((ret = avpriv_split_xiph_headers(headers, headers_len, 30, header_start, header_len)) < 0) {
1037 av_log(avctx, AV_LOG_ERROR, "Extradata corrupt.\n");
1038 return ret;
1039 }
1040
1041 init_get_bits(gb, header_start[0], header_len[0]*8);
1042 hdr_type = get_bits(gb, 8);
1043 if (hdr_type != 1) {
1044 av_log(avctx, AV_LOG_ERROR, "First header is not the id header.\n");
1045 return AVERROR_INVALIDDATA;
1046 }
1047 if ((ret = vorbis_parse_id_hdr(vc))) {
1048 av_log(avctx, AV_LOG_ERROR, "Id header corrupt.\n");
1049 vorbis_free(vc);
1050 return ret;
1051 }
1052
1053 init_get_bits(gb, header_start[2], header_len[2]*8);
1054 hdr_type = get_bits(gb, 8);
1055 if (hdr_type != 5) {
1056 av_log(avctx, AV_LOG_ERROR, "Third header is not the setup header.\n");
1057 vorbis_free(vc);
1058 return AVERROR_INVALIDDATA;
1059 }
1060 if ((ret = vorbis_parse_setup_hdr(vc))) {
1061 av_log(avctx, AV_LOG_ERROR, "Setup header corrupt.\n");
1062 vorbis_free(vc);
1063 return ret;
1064 }
1065
1066 if (vc->audio_channels > 8)
1067 avctx->channel_layout = 0;
1068 else
1069 avctx->channel_layout = ff_vorbis_channel_layouts[vc->audio_channels - 1];
1070
1071 avctx->channels = vc->audio_channels;
1072 avctx->sample_rate = vc->audio_samplerate;
1073
1074 return 0;
1075}
1076
1077// Decode audiopackets -------------------------------------------------
1078
1079// Read and decode floor
1080
1081static int vorbis_floor0_decode(vorbis_context *vc,
1082 vorbis_floor_data *vfu, float *vec)
1083{
1084 vorbis_floor0 *vf = &vfu->t0;
1085 float *lsp = vf->lsp;
1086 unsigned amplitude, book_idx;
1087 unsigned blockflag = vc->modes[vc->mode_number].blockflag;
1088
1089 if (!vf->amplitude_bits)
1090 return 1;
1091
1092 amplitude = get_bits(&vc->gb, vf->amplitude_bits);
1093 if (amplitude > 0) {
1094 float last = 0;
1095 unsigned idx, lsp_len = 0;
1096 vorbis_codebook codebook;
1097
1098 book_idx = get_bits(&vc->gb, ilog(vf->num_books));
1099 if (book_idx >= vf->num_books) {
1100 av_log(vc->avctx, AV_LOG_ERROR, "floor0 dec: booknumber too high!\n");
1101 book_idx = 0;
1102 }
1103 av_dlog(NULL, "floor0 dec: booknumber: %u\n", book_idx);
1104 codebook = vc->codebooks[vf->book_list[book_idx]];
1105 /* Invalid codebook! */
1106 if (!codebook.codevectors)
1107 return AVERROR_INVALIDDATA;
1108
1109 while (lsp_len<vf->order) {
1110 int vec_off;
1111
1112 av_dlog(NULL, "floor0 dec: book dimension: %d\n", codebook.dimensions);
1113 av_dlog(NULL, "floor0 dec: maximum depth: %d\n", codebook.maxdepth);
1114 /* read temp vector */
1115 vec_off = get_vlc2(&vc->gb, codebook.vlc.table,
1116 codebook.nb_bits, codebook.maxdepth)
1117 * codebook.dimensions;
1118 av_dlog(NULL, "floor0 dec: vector offset: %d\n", vec_off);
1119 /* copy each vector component and add last to it */
1120 for (idx = 0; idx < codebook.dimensions; ++idx)
1121 lsp[lsp_len+idx] = codebook.codevectors[vec_off+idx] + last;
1122 last = lsp[lsp_len+idx-1]; /* set last to last vector component */
1123
1124 lsp_len += codebook.dimensions;
1125 }
1126 /* DEBUG: output lsp coeffs */
1127 {
1128 int idx;
1129 for (idx = 0; idx < lsp_len; ++idx)
1130 av_dlog(NULL, "floor0 dec: coeff at %d is %f\n", idx, lsp[idx]);
1131 }
1132
1133 /* synthesize floor output vector */
1134 {
1135 int i;
1136 int order = vf->order;
1137 float wstep = M_PI / vf->bark_map_size;
1138
1139 for (i = 0; i < order; i++)
1140 lsp[i] = 2.0f * cos(lsp[i]);
1141
1142 av_dlog(NULL, "floor0 synth: map_size = %"PRIu32"; m = %d; wstep = %f\n",
1143 vf->map_size[blockflag], order, wstep);
1144
1145 i = 0;
1146 while (i < vf->map_size[blockflag]) {
1147 int j, iter_cond = vf->map[blockflag][i];
1148 float p = 0.5f;
1149 float q = 0.5f;
1150 float two_cos_w = 2.0f * cos(wstep * iter_cond); // needed all times
1151
1152 /* similar part for the q and p products */
1153 for (j = 0; j + 1 < order; j += 2) {
1154 q *= lsp[j] - two_cos_w;
1155 p *= lsp[j + 1] - two_cos_w;
1156 }
1157 if (j == order) { // even order
1158 p *= p * (2.0f - two_cos_w);
1159 q *= q * (2.0f + two_cos_w);
1160 } else { // odd order
1161 q *= two_cos_w-lsp[j]; // one more time for q
1162
1163 /* final step and square */
1164 p *= p * (4.f - two_cos_w * two_cos_w);
1165 q *= q;
1166 }
1167
1168 /* calculate linear floor value */
1169 q = exp((((amplitude*vf->amplitude_offset) /
1170 (((1 << vf->amplitude_bits) - 1) * sqrt(p + q)))
1171 - vf->amplitude_offset) * .11512925f);
1172
1173 /* fill vector */
1174 do {
1175 vec[i] = q; ++i;
1176 } while (vf->map[blockflag][i] == iter_cond);
1177 }
1178 }
1179 } else {
1180 /* this channel is unused */
1181 return 1;
1182 }
1183
1184 av_dlog(NULL, " Floor0 decoded\n");
1185
1186 return 0;
1187}
1188
1189static int vorbis_floor1_decode(vorbis_context *vc,
1190 vorbis_floor_data *vfu, float *vec)
1191{
1192 vorbis_floor1 *vf = &vfu->t1;
1193 GetBitContext *gb = &vc->gb;
1194 uint16_t range_v[4] = { 256, 128, 86, 64 };
1195 unsigned range = range_v[vf->multiplier - 1];
1196 uint16_t floor1_Y[258];
1197 uint16_t floor1_Y_final[258];
1198 int floor1_flag[258];
1199 unsigned partition_class, cdim, cbits, csub, cval, offset, i, j;
1200 int book, adx, ady, dy, off, predicted, err;
1201
1202
1203 if (!get_bits1(gb)) // silence
1204 return 1;
1205
1206// Read values (or differences) for the floor's points
1207
1208 floor1_Y[0] = get_bits(gb, ilog(range - 1));
1209 floor1_Y[1] = get_bits(gb, ilog(range - 1));
1210
1211 av_dlog(NULL, "floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);
1212
1213 offset = 2;
1214 for (i = 0; i < vf->partitions; ++i) {
1215 partition_class = vf->partition_class[i];
1216 cdim = vf->class_dimensions[partition_class];
1217 cbits = vf->class_subclasses[partition_class];
1218 csub = (1 << cbits) - 1;
1219 cval = 0;
1220
1221 av_dlog(NULL, "Cbits %u\n", cbits);
1222
1223 if (cbits) // this reads all subclasses for this partition's class
1224 cval = get_vlc2(gb, vc->codebooks[vf->class_masterbook[partition_class]].vlc.table,
1225 vc->codebooks[vf->class_masterbook[partition_class]].nb_bits, 3);
1226
1227 for (j = 0; j < cdim; ++j) {
1228 book = vf->subclass_books[partition_class][cval & csub];
1229
1230 av_dlog(NULL, "book %d Cbits %u cval %u bits:%d\n",
1231 book, cbits, cval, get_bits_count(gb));
1232
1233 cval = cval >> cbits;
1234 if (book > -1) {
1235 int v = get_vlc2(gb, vc->codebooks[book].vlc.table,
1236 vc->codebooks[book].nb_bits, 3);
1237 if (v < 0)
1238 return AVERROR_INVALIDDATA;
1239 floor1_Y[offset+j] = v;
1240 } else {
1241 floor1_Y[offset+j] = 0;
1242 }
1243
1244 av_dlog(NULL, " floor(%d) = %d \n",
1245 vf->list[offset+j].x, floor1_Y[offset+j]);
1246 }
1247 offset+=cdim;
1248 }
1249
1250// Amplitude calculation from the differences
1251
1252 floor1_flag[0] = 1;
1253 floor1_flag[1] = 1;
1254 floor1_Y_final[0] = floor1_Y[0];
1255 floor1_Y_final[1] = floor1_Y[1];
1256
1257 for (i = 2; i < vf->x_list_dim; ++i) {
1258 unsigned val, highroom, lowroom, room, high_neigh_offs, low_neigh_offs;
1259
1260 low_neigh_offs = vf->list[i].low;
1261 high_neigh_offs = vf->list[i].high;
1262 dy = floor1_Y_final[high_neigh_offs] - floor1_Y_final[low_neigh_offs]; // render_point begin
1263 adx = vf->list[high_neigh_offs].x - vf->list[low_neigh_offs].x;
1264 ady = FFABS(dy);
1265 err = ady * (vf->list[i].x - vf->list[low_neigh_offs].x);
1266 off = err / adx;
1267 if (dy < 0) {
1268 predicted = floor1_Y_final[low_neigh_offs] - off;
1269 } else {
1270 predicted = floor1_Y_final[low_neigh_offs] + off;
1271 } // render_point end
1272
1273 val = floor1_Y[i];
1274 highroom = range-predicted;
1275 lowroom = predicted;
1276 if (highroom < lowroom) {
1277 room = highroom * 2;
1278 } else {
1279 room = lowroom * 2; // SPEC misspelling
1280 }
1281 if (val) {
1282 floor1_flag[low_neigh_offs] = 1;
1283 floor1_flag[high_neigh_offs] = 1;
1284 floor1_flag[i] = 1;
1285 if (val >= room) {
1286 if (highroom > lowroom) {
1287 floor1_Y_final[i] = av_clip_uint16(val - lowroom + predicted);
1288 } else {
1289 floor1_Y_final[i] = av_clip_uint16(predicted - val + highroom - 1);
1290 }
1291 } else {
1292 if (val & 1) {
1293 floor1_Y_final[i] = av_clip_uint16(predicted - (val + 1) / 2);
1294 } else {
1295 floor1_Y_final[i] = av_clip_uint16(predicted + val / 2);
1296 }
1297 }
1298 } else {
1299 floor1_flag[i] = 0;
1300 floor1_Y_final[i] = av_clip_uint16(predicted);
1301 }
1302
1303 av_dlog(NULL, " Decoded floor(%d) = %u / val %u\n",
1304 vf->list[i].x, floor1_Y_final[i], val);
1305 }
1306
1307// Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?
1308
1309 ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);
1310
1311 av_dlog(NULL, " Floor decoded\n");
1312
1313 return 0;
1314}
1315
1316static av_always_inline int setup_classifs(vorbis_context *vc,
1317 vorbis_residue *vr,
1318 uint8_t *do_not_decode,
1319 unsigned ch_used,
1320 int partition_count,
1321 int ptns_to_read
1322 )
1323{
1324 int p, j, i;
1325 unsigned c_p_c = vc->codebooks[vr->classbook].dimensions;
1326 unsigned inverse_class = ff_inverse[vr->classifications];
1327 unsigned temp, temp2;
1328 for (p = 0, j = 0; j < ch_used; ++j) {
1329 if (!do_not_decode[j]) {
1330 temp = get_vlc2(&vc->gb, vc->codebooks[vr->classbook].vlc.table,
1331 vc->codebooks[vr->classbook].nb_bits, 3);
1332
1333 av_dlog(NULL, "Classword: %u\n", temp);
1334
1335 if ((int)temp < 0)
1336 return temp;
1337
1338 av_assert0(vr->classifications > 1); //needed for inverse[]
1339
1340 if (temp <= 65536) {
1341 for (i = partition_count + c_p_c - 1; i >= partition_count; i--) {
1342 temp2 = (((uint64_t)temp) * inverse_class) >> 32;
1343
1344 if (i < ptns_to_read)
1345 vr->classifs[p + i] = temp - temp2 * vr->classifications;
1346 temp = temp2;
1347 }
1348 } else {
1349 for (i = partition_count + c_p_c - 1; i >= partition_count; i--) {
1350 temp2 = temp / vr->classifications;
1351
1352 if (i < ptns_to_read)
1353 vr->classifs[p + i] = temp - temp2 * vr->classifications;
1354 temp = temp2;
1355 }
1356 }
1357 }
1358 p += ptns_to_read;
1359 }
1360 return 0;
1361}
1362// Read and decode residue
1363
1364static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc,
1365 vorbis_residue *vr,
1366 unsigned ch,
1367 uint8_t *do_not_decode,
1368 float *vec,
1369 unsigned vlen,
1370 unsigned ch_left,
1371 int vr_type)
1372{
1373 GetBitContext *gb = &vc->gb;
1374 unsigned c_p_c = vc->codebooks[vr->classbook].dimensions;
1375 uint8_t *classifs = vr->classifs;
1376 unsigned pass, ch_used, i, j, k, l;
1377 unsigned max_output = (ch - 1) * vlen;
1378 int ptns_to_read = vr->ptns_to_read;
1379 int libvorbis_bug = 0;
1380
1381 if (vr_type == 2) {
1382 for (j = 1; j < ch; ++j)
1383 do_not_decode[0] &= do_not_decode[j]; // FIXME - clobbering input
1384 if (do_not_decode[0])
1385 return 0;
1386 ch_used = 1;
1387 max_output += vr->end / ch;
1388 } else {
1389 ch_used = ch;
1390 max_output += vr->end;
1391 }
1392
1393 if (max_output > ch_left * vlen) {
1394 if (max_output <= ch_left * vlen + vr->partition_size*ch_used/ch) {
1395 ptns_to_read--;
1396 libvorbis_bug = 1;
1397 } else {
1398 av_log(vc->avctx, AV_LOG_ERROR, "Insufficient output buffer\n");
1399 return AVERROR_INVALIDDATA;
1400 }
1401 }
1402
1403 av_dlog(NULL, " residue type 0/1/2 decode begin, ch: %d cpc %d \n", ch, c_p_c);
1404
1405 for (pass = 0; pass <= vr->maxpass; ++pass) { // FIXME OPTIMIZE?
1406 int voffset, partition_count, j_times_ptns_to_read;
1407
1408 voffset = vr->begin;
1409 for (partition_count = 0; partition_count < ptns_to_read;) { // SPEC error
1410 if (!pass) {
1411 int ret;
1412 if ((ret = setup_classifs(vc, vr, do_not_decode, ch_used, partition_count, ptns_to_read)) < 0)
1413 return ret;
1414 }
1415 for (i = 0; (i < c_p_c) && (partition_count < ptns_to_read); ++i) {
1416 for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {
1417 unsigned voffs;
1418
1419 if (!do_not_decode[j]) {
1420 unsigned vqclass = classifs[j_times_ptns_to_read + partition_count];
1421 int vqbook = vr->books[vqclass][pass];
1422
1423 if (vqbook >= 0 && vc->codebooks[vqbook].codevectors) {
1424 unsigned coffs;
1425 unsigned dim = vc->codebooks[vqbook].dimensions;
1426 unsigned step = FASTDIV(vr->partition_size << 1, dim << 1);
1427 vorbis_codebook codebook = vc->codebooks[vqbook];
1428
1429 if (vr_type == 0) {
1430
1431 voffs = voffset+j*vlen;
1432 for (k = 0; k < step; ++k) {
1433 coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1434 for (l = 0; l < dim; ++l)
1435 vec[voffs + k + l * step] += codebook.codevectors[coffs + l];
1436 }
1437 } else if (vr_type == 1) {
1438 voffs = voffset + j * vlen;
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, ++voffs) {
1442 vec[voffs]+=codebook.codevectors[coffs+l];
1443
1444 av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d \n",
1445 pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);
1446 }
1447 }
1448 } else if (vr_type == 2 && ch == 2 && (voffset & 1) == 0 && (dim & 1) == 0) { // most frequent case optimized
1449 voffs = voffset >> 1;
1450
1451 if (dim == 2) {
1452 for (k = 0; k < step; ++k) {
1453 coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;
1454 vec[voffs + k ] += codebook.codevectors[coffs ];
1455 vec[voffs + k + vlen] += codebook.codevectors[coffs + 1];
1456 }
1457 } else if (dim == 4) {
1458 for (k = 0; k < step; ++k, voffs += 2) {
1459 coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4;
1460 vec[voffs ] += codebook.codevectors[coffs ];
1461 vec[voffs + 1 ] += codebook.codevectors[coffs + 2];
1462 vec[voffs + vlen ] += codebook.codevectors[coffs + 1];
1463 vec[voffs + vlen + 1] += codebook.codevectors[coffs + 3];
1464 }
1465 } else
1466 for (k = 0; k < step; ++k) {
1467 coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1468 for (l = 0; l < dim; l += 2, voffs++) {
1469 vec[voffs ] += codebook.codevectors[coffs + l ];
1470 vec[voffs + vlen] += codebook.codevectors[coffs + l + 1];
1471
1472 av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d+%d \n",
1473 pass, voffset / ch + (voffs % ch) * vlen,
1474 vec[voffset / ch + (voffs % ch) * vlen],
1475 codebook.codevectors[coffs + l], coffs, l);
1476 }
1477 }
1478
1479 } else if (vr_type == 2) {
1480 unsigned voffs_div = FASTDIV(voffset << 1, ch <<1);
1481 unsigned voffs_mod = voffset - voffs_div * ch;
1482
1483 for (k = 0; k < step; ++k) {
1484 coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1485 for (l = 0; l < dim; ++l) {
1486 vec[voffs_div + voffs_mod * vlen] +=
1487 codebook.codevectors[coffs + l];
1488
1489 av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d+%d \n",
1490 pass, voffs_div + voffs_mod * vlen,
1491 vec[voffs_div + voffs_mod * vlen],
1492 codebook.codevectors[coffs + l], coffs, l);
1493
1494 if (++voffs_mod == ch) {
1495 voffs_div++;
1496 voffs_mod = 0;
1497 }
1498 }
1499 }
1500 }
1501 }
1502 }
1503 j_times_ptns_to_read += ptns_to_read;
1504 }
1505 ++partition_count;
1506 voffset += vr->partition_size;
1507 }
1508 }
1509 if (libvorbis_bug && !pass) {
1510 for (j = 0; j < ch_used; ++j) {
1511 if (!do_not_decode[j]) {
1512 get_vlc2(&vc->gb, vc->codebooks[vr->classbook].vlc.table,
1513 vc->codebooks[vr->classbook].nb_bits, 3);
1514 }
1515 }
1516 }
1517 }
1518 return 0;
1519}
1520
1521static inline int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr,
1522 unsigned ch,
1523 uint8_t *do_not_decode,
1524 float *vec, unsigned vlen,
1525 unsigned ch_left)
1526{
1527 if (vr->type == 2)
1528 return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 2);
1529 else if (vr->type == 1)
1530 return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 1);
1531 else if (vr->type == 0)
1532 return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 0);
1533 else {
1534 av_log(vc->avctx, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");
1535 return AVERROR_INVALIDDATA;
1536 }
1537}
1538
1539void ff_vorbis_inverse_coupling(float *mag, float *ang, intptr_t blocksize)
1540{
1541 int i;
1542 for (i = 0; i < blocksize; i++) {
1543 if (mag[i] > 0.0) {
1544 if (ang[i] > 0.0) {
1545 ang[i] = mag[i] - ang[i];
1546 } else {
1547 float temp = ang[i];
1548 ang[i] = mag[i];
1549 mag[i] += temp;
1550 }
1551 } else {
1552 if (ang[i] > 0.0) {
1553 ang[i] += mag[i];
1554 } else {
1555 float temp = ang[i];
1556 ang[i] = mag[i];
1557 mag[i] -= temp;
1558 }
1559 }
1560 }
1561}
1562
1563// Decode the audio packet using the functions above
1564
1565static int vorbis_parse_audio_packet(vorbis_context *vc, float **floor_ptr)
1566{
1567 GetBitContext *gb = &vc->gb;
1568 FFTContext *mdct;
1569 int previous_window = vc->previous_window;
1570 unsigned mode_number, blockflag, blocksize;
1571 int i, j;
1572 uint8_t no_residue[255];
1573 uint8_t do_not_decode[255];
1574 vorbis_mapping *mapping;
1575 float *ch_res_ptr = vc->channel_residues;
1576 uint8_t res_chan[255];
1577 unsigned res_num = 0;
1578 int retlen = 0;
1579 unsigned ch_left = vc->audio_channels;
1580 unsigned vlen;
1581
1582 if (get_bits1(gb)) {
1583 av_log(vc->avctx, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");
1584 return AVERROR_INVALIDDATA; // packet type not audio
1585 }
1586
1587 if (vc->mode_count == 1) {
1588 mode_number = 0;
1589 } else {
1590 GET_VALIDATED_INDEX(mode_number, ilog(vc->mode_count-1), vc->mode_count)
1591 }
1592 vc->mode_number = mode_number;
1593 mapping = &vc->mappings[vc->modes[mode_number].mapping];
1594
1595 av_dlog(NULL, " Mode number: %u , mapping: %d , blocktype %d\n", mode_number,
1596 vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);
1597
1598 blockflag = vc->modes[mode_number].blockflag;
1599 blocksize = vc->blocksize[blockflag];
1600 vlen = blocksize / 2;
1601 if (blockflag) {
1602 int code = get_bits(gb, 2);
1603 if (previous_window < 0)
1604 previous_window = code>>1;
1605 } else if (previous_window < 0)
1606 previous_window = 0;
1607
1608 memset(ch_res_ptr, 0, sizeof(float) * vc->audio_channels * vlen); //FIXME can this be removed ?
1609 for (i = 0; i < vc->audio_channels; ++i)
1610 memset(floor_ptr[i], 0, vlen * sizeof(floor_ptr[0][0])); //FIXME can this be removed ?
1611
1612// Decode floor
1613
1614 for (i = 0; i < vc->audio_channels; ++i) {
1615 vorbis_floor *floor;
1616 int ret;
1617 if (mapping->submaps > 1) {
1618 floor = &vc->floors[mapping->submap_floor[mapping->mux[i]]];
1619 } else {
1620 floor = &vc->floors[mapping->submap_floor[0]];
1621 }
1622
1623 ret = floor->decode(vc, &floor->data, floor_ptr[i]);
1624
1625 if (ret < 0) {
1626 av_log(vc->avctx, AV_LOG_ERROR, "Invalid codebook in vorbis_floor_decode.\n");
1627 return AVERROR_INVALIDDATA;
1628 }
1629 no_residue[i] = ret;
1630 }
1631
1632// Nonzero vector propagate
1633
1634 for (i = mapping->coupling_steps - 1; i >= 0; --i) {
1635 if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {
1636 no_residue[mapping->magnitude[i]] = 0;
1637 no_residue[mapping->angle[i]] = 0;
1638 }
1639 }
1640
1641// Decode residue
1642
1643 for (i = 0; i < mapping->submaps; ++i) {
1644 vorbis_residue *residue;
1645 unsigned ch = 0;
1646 int ret;
1647
1648 for (j = 0; j < vc->audio_channels; ++j) {
1649 if ((mapping->submaps == 1) || (i == mapping->mux[j])) {
1650 res_chan[j] = res_num;
1651 if (no_residue[j]) {
1652 do_not_decode[ch] = 1;
1653 } else {
1654 do_not_decode[ch] = 0;
1655 }
1656 ++ch;
1657 ++res_num;
1658 }
1659 }
1660 residue = &vc->residues[mapping->submap_residue[i]];
1661 if (ch_left < ch) {
1662 av_log(vc->avctx, AV_LOG_ERROR, "Too many channels in vorbis_floor_decode.\n");
1663 return AVERROR_INVALIDDATA;
1664 }
1665 if (ch) {
1666 ret = vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, vlen, ch_left);
1667 if (ret < 0)
1668 return ret;
1669 }
1670
1671 ch_res_ptr += ch * vlen;
1672 ch_left -= ch;
1673 }
1674
1675 if (ch_left > 0)
1676 return AVERROR_INVALIDDATA;
1677
1678// Inverse coupling
1679
1680 for (i = mapping->coupling_steps - 1; i >= 0; --i) { //warning: i has to be signed
1681 float *mag, *ang;
1682
1683 mag = vc->channel_residues+res_chan[mapping->magnitude[i]] * blocksize / 2;
1684 ang = vc->channel_residues+res_chan[mapping->angle[i]] * blocksize / 2;
1685 vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize / 2);
1686 }
1687
1688// Dotproduct, MDCT
1689
1690 mdct = &vc->mdct[blockflag];
1691
1692 for (j = vc->audio_channels-1;j >= 0; j--) {
1693 ch_res_ptr = vc->channel_residues + res_chan[j] * blocksize / 2;
f6fa7814 1694 vc->fdsp->vector_fmul(floor_ptr[j], floor_ptr[j], ch_res_ptr, blocksize / 2);
2ba45a60
DM		 1695 mdct->imdct_half(mdct, ch_res_ptr, floor_ptr[j]);
1696 }
1697
1698// Overlap/add, save data for next overlapping
1699
1700 retlen = (blocksize + vc->blocksize[previous_window]) / 4;
1701 for (j = 0; j < vc->audio_channels; j++) {
1702 unsigned bs0 = vc->blocksize[0];
1703 unsigned bs1 = vc->blocksize[1];
1704 float *residue = vc->channel_residues + res_chan[j] * blocksize / 2;
1705 float *saved = vc->saved + j * bs1 / 4;
1706 float *ret = floor_ptr[j];
1707 float *buf = residue;
1708 const float *win = vc->win[blockflag & previous_window];
1709
1710 if (blockflag == previous_window) {
f6fa7814 1711 vc->fdsp->vector_fmul_window(ret, saved, buf, win, blocksize / 4);
2ba45a60 1712 } else if (blockflag > previous_window) {
f6fa7814 1713 vc->fdsp->vector_fmul_window(ret, saved, buf, win, bs0 / 4);
2ba45a60
DM		 1714 memcpy(ret+bs0/2, buf+bs0/4, ((bs1-bs0)/4) * sizeof(float));
1715 } else {
1716 memcpy(ret, saved, ((bs1 - bs0) / 4) * sizeof(float));
f6fa7814 1717 vc->fdsp->vector_fmul_window(ret + (bs1 - bs0) / 4, saved + (bs1 - bs0) / 4, buf, win, bs0 / 4);
2ba45a60
DM		 1718 }
1719 memcpy(saved, buf + blocksize / 4, blocksize / 4 * sizeof(float));
1720 }
1721
1722 vc->previous_window = blockflag;
1723 return retlen;
1724}
1725
1726// Return the decoded audio packet through the standard api
1727
1728static int vorbis_decode_frame(AVCodecContext *avctx, void *data,
1729 int *got_frame_ptr, AVPacket *avpkt)
1730{
1731 const uint8_t *buf = avpkt->data;
1732 int buf_size = avpkt->size;
1733 vorbis_context *vc = avctx->priv_data;
1734 AVFrame *frame = data;
1735 GetBitContext *gb = &vc->gb;
1736 float *channel_ptrs[255];
1737 int i, len, ret;
1738
1739 av_dlog(NULL, "packet length %d \n", buf_size);
1740
1741 if (*buf == 1 && buf_size > 7) {
1742 init_get_bits(gb, buf+1, buf_size*8 - 8);
1743 vorbis_free(vc);
1744 if ((ret = vorbis_parse_id_hdr(vc))) {
1745 av_log(avctx, AV_LOG_ERROR, "Id header corrupt.\n");
1746 vorbis_free(vc);
1747 return ret;
1748 }
1749
1750 if (vc->audio_channels > 8)
1751 avctx->channel_layout = 0;
1752 else
1753 avctx->channel_layout = ff_vorbis_channel_layouts[vc->audio_channels - 1];
1754
1755 avctx->channels = vc->audio_channels;
1756 avctx->sample_rate = vc->audio_samplerate;
1757 return buf_size;
1758 }
1759
1760 if (*buf == 3 && buf_size > 7) {
1761 av_log(avctx, AV_LOG_DEBUG, "Ignoring comment header\n");
1762 return buf_size;
1763 }
1764
1765 if (*buf == 5 && buf_size > 7 && vc->channel_residues && !vc->modes) {
1766 init_get_bits(gb, buf+1, buf_size*8 - 8);
1767 if ((ret = vorbis_parse_setup_hdr(vc))) {
1768 av_log(avctx, AV_LOG_ERROR, "Setup header corrupt.\n");
1769 vorbis_free(vc);
1770 return ret;
1771 }
1772 return buf_size;
1773 }
1774
1775 if (!vc->channel_residues || !vc->modes) {
1776 av_log(avctx, AV_LOG_ERROR, "Data packet before valid headers\n");
1777 return AVERROR_INVALIDDATA;
1778 }
1779
1780 /* get output buffer */
1781 frame->nb_samples = vc->blocksize[1] / 2;
1782 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
1783 return ret;
1784
1785 if (vc->audio_channels > 8) {
1786 for (i = 0; i < vc->audio_channels; i++)
1787 channel_ptrs[i] = (float *)frame->extended_data[i];
1788 } else {
1789 for (i = 0; i < vc->audio_channels; i++) {
1790 int ch = ff_vorbis_channel_layout_offsets[vc->audio_channels - 1][i];
1791 channel_ptrs[ch] = (float *)frame->extended_data[i];
1792 }
1793 }
1794
1795 init_get_bits(gb, buf, buf_size*8);
1796
1797 if ((len = vorbis_parse_audio_packet(vc, channel_ptrs)) <= 0)
1798 return len;
1799
1800 if (!vc->first_frame) {
1801 vc->first_frame = 1;
1802 *got_frame_ptr = 0;
1803 av_frame_unref(frame);
1804 return buf_size;
1805 }
1806
1807 av_dlog(NULL, "parsed %d bytes %d bits, returned %d samples (*ch*bits) \n",
1808 get_bits_count(gb) / 8, get_bits_count(gb) % 8, len);
1809
1810 frame->nb_samples = len;
1811 *got_frame_ptr = 1;
1812
1813 return buf_size;
1814}
1815
1816// Close decoder
1817
1818static av_cold int vorbis_decode_close(AVCodecContext *avctx)
1819{
1820 vorbis_context *vc = avctx->priv_data;
1821
1822 vorbis_free(vc);
1823
1824 return 0;
1825}
1826
1827static av_cold void vorbis_decode_flush(AVCodecContext *avctx)
1828{
1829 vorbis_context *vc = avctx->priv_data;
1830
1831 if (vc->saved) {
1832 memset(vc->saved, 0, (vc->blocksize[1] / 4) * vc->audio_channels *
1833 sizeof(*vc->saved));
1834 }
1835 vc->previous_window = -1;
1836 vc->first_frame = 0;
1837}
1838
1839AVCodec ff_vorbis_decoder = {
1840 .name = "vorbis",
1841 .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),
1842 .type = AVMEDIA_TYPE_AUDIO,
1843 .id = AV_CODEC_ID_VORBIS,
1844 .priv_data_size = sizeof(vorbis_context),
1845 .init = vorbis_decode_init,
1846 .close = vorbis_decode_close,
1847 .decode = vorbis_decode_frame,
1848 .flush = vorbis_decode_flush,
1849 .capabilities = CODEC_CAP_DR1,
1850 .channel_layouts = ff_vorbis_channel_layouts,
1851 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
1852 AV_SAMPLE_FMT_NONE },
1853};
ffmpeg Piment Noir Debian package repository