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vorbisdec.c
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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 
50 typedef struct {
55  float *codevectors;
56  unsigned int nb_bits;
58 
59 typedef union vorbis_floor_u vorbis_floor_data;
60 typedef struct vorbis_floor0_s vorbis_floor0;
61 typedef struct vorbis_floor1_s vorbis_floor1;
62 struct vorbis_context_s;
63 typedef
65  (struct vorbis_context_s *, vorbis_floor_data *, float *);
66 typedef struct {
70  struct vorbis_floor0_s {
72  uint16_t rate;
73  uint16_t bark_map_size;
74  int32_t *map[2];
75  uint32_t map_size[2];
80  float *lsp;
81  } t0;
82  struct vorbis_floor1_s {
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];
90  uint16_t x_list_dim;
92  } t1;
93  } data;
94 } vorbis_floor;
95 
96 typedef struct {
97  uint16_t type;
98  uint32_t begin;
99  uint32_t end;
100  unsigned partition_size;
103  int16_t books[64][8];
105  uint16_t ptns_to_read;
108 
109 typedef struct {
111  uint16_t coupling_steps;
115  uint8_t submap_floor[16];
116  uint8_t submap_residue[16];
118 
119 typedef struct {
121  uint16_t windowtype;
122  uint16_t transformtype;
124 } vorbis_mode;
125 
126 typedef struct vorbis_context_s {
132 
133  FFTContext mdct[2];
135  uint32_t version;
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;
153  uint8_t mode_number; // mode number for the current packet
156  float *saved;
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 
164 static 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 
178 static 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 
190 static void vorbis_free(vorbis_context *vc)
191 {
192  int i;
193 
195  av_freep(&vc->saved);
196  av_freep(&vc->fdsp);
197 
198  if (vc->residues)
199  for (i = 0; i < vc->residue_count; i++)
200  av_freep(&vc->residues[i].classifs);
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) {
209  av_freep(&vc->codebooks[i].codevectors);
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) {
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);
221  } else {
222  av_freep(&vc->floors[i].data.t1.list);
223  }
224  }
225  av_freep(&vc->floors);
226 
227  if (vc->mappings)
228  for (i = 0; i < vc->mapping_count; ++i) {
229  av_freep(&vc->mappings[i].magnitude);
230  av_freep(&vc->mappings[i].angle);
231  av_freep(&vc->mappings[i].mux);
232  }
233  av_freep(&vc->mappings);
234 }
235 
236 // Parse setup header -------------------------------------------------
237 
238 // Process codebooks part
239 
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) {
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) {
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) {
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:
459 error:
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 
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 
489 static int vorbis_floor0_decode(vorbis_context *vc,
490  vorbis_floor_data *vfu, float *vec);
491 static int create_map(vorbis_context *vc, unsigned floor_number);
492 static int vorbis_floor1_decode(vorbis_context *vc,
493  vorbis_floor_data *vfu, float *vec);
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]) {
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) {
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
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) {
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 
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)) {
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 
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 
835 static 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 
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 
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 
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);
997  if (!vc->fdsp)
998  return AVERROR(ENOMEM);
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 ",
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 
1016 {
1017  vorbis_context *vc = avctx->priv_data;
1018  uint8_t *headers = avctx->extradata;
1019  int headers_len = avctx->extradata_size;
1020  const 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);
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
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 
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 
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 
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 
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 
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 
1539 void 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 
1565 static 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;
1694  vc->fdsp->vector_fmul(floor_ptr[j], floor_ptr[j], ch_res_ptr, blocksize / 2);
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) {
1711  vc->fdsp->vector_fmul_window(ret, saved, buf, win, blocksize / 4);
1712  } else if (blockflag > previous_window) {
1713  vc->fdsp->vector_fmul_window(ret, saved, buf, win, bs0 / 4);
1714  memcpy(ret+bs0/2, buf+bs0/4, ((bs1-bs0)/4) * sizeof(float));
1715  } else {
1716  memcpy(ret, saved, ((bs1 - bs0) / 4) * sizeof(float));
1717  vc->fdsp->vector_fmul_window(ret + (bs1 - bs0) / 4, saved + (bs1 - bs0) / 4, buf, win, bs0 / 4);
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 
1728 static 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
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 
1819 {
1820  vorbis_context *vc = avctx->priv_data;
1821 
1822  vorbis_free(vc);
1823 
1824  return 0;
1825 }
1826 
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 
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),
1849  .capabilities = CODEC_CAP_DR1,
1850  .channel_layouts = ff_vorbis_channel_layouts,
1851  .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
1853 };