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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 
197  if (vc->residues)
198  for (i = 0; i < vc->residue_count; i++)
199  av_freep(&vc->residues[i].classifs);
200  av_freep(&vc->residues);
201  av_freep(&vc->modes);
202 
203  ff_mdct_end(&vc->mdct[0]);
204  ff_mdct_end(&vc->mdct[1]);
205 
206  if (vc->codebooks)
207  for (i = 0; i < vc->codebook_count; ++i) {
208  av_freep(&vc->codebooks[i].codevectors);
209  ff_free_vlc(&vc->codebooks[i].vlc);
210  }
211  av_freep(&vc->codebooks);
212 
213  if (vc->floors)
214  for (i = 0; i < vc->floor_count; ++i) {
215  if (vc->floors[i].floor_type == 0) {
216  av_freep(&vc->floors[i].data.t0.map[0]);
217  av_freep(&vc->floors[i].data.t0.map[1]);
218  av_freep(&vc->floors[i].data.t0.book_list);
219  av_freep(&vc->floors[i].data.t0.lsp);
220  } else {
221  av_freep(&vc->floors[i].data.t1.list);
222  }
223  }
224  av_freep(&vc->floors);
225 
226  if (vc->mappings)
227  for (i = 0; i < vc->mapping_count; ++i) {
228  av_freep(&vc->mappings[i].magnitude);
229  av_freep(&vc->mappings[i].angle);
230  av_freep(&vc->mappings[i].mux);
231  }
232  av_freep(&vc->mappings);
233 }
234 
235 // Parse setup header -------------------------------------------------
236 
237 // Process codebooks part
238 
240 {
241  unsigned cb;
242  uint8_t *tmp_vlc_bits = NULL;
243  uint32_t *tmp_vlc_codes = NULL;
244  GetBitContext *gb = &vc->gb;
245  uint16_t *codebook_multiplicands = NULL;
246  int ret = 0;
247 
248  vc->codebook_count = get_bits(gb, 8) + 1;
249 
250  av_dlog(NULL, " Codebooks: %d \n", vc->codebook_count);
251 
252  vc->codebooks = av_mallocz(vc->codebook_count * sizeof(*vc->codebooks));
253  tmp_vlc_bits = av_mallocz(V_MAX_VLCS * sizeof(*tmp_vlc_bits));
254  tmp_vlc_codes = av_mallocz(V_MAX_VLCS * sizeof(*tmp_vlc_codes));
255  codebook_multiplicands = av_malloc(V_MAX_VLCS * sizeof(*codebook_multiplicands));
256  if (!vc->codebooks ||
257  !tmp_vlc_bits || !tmp_vlc_codes || !codebook_multiplicands) {
258  ret = AVERROR(ENOMEM);
259  goto error;
260  }
261 
262  for (cb = 0; cb < vc->codebook_count; ++cb) {
263  vorbis_codebook *codebook_setup = &vc->codebooks[cb];
264  unsigned ordered, t, entries, used_entries = 0;
265 
266  av_dlog(NULL, " %u. Codebook\n", cb);
267 
268  if (get_bits(gb, 24) != 0x564342) {
270  " %u. Codebook setup data corrupt.\n", cb);
271  ret = AVERROR_INVALIDDATA;
272  goto error;
273  }
274 
275  codebook_setup->dimensions=get_bits(gb, 16);
276  if (codebook_setup->dimensions > 16 || codebook_setup->dimensions == 0) {
278  " %u. Codebook's dimension is invalid (%d).\n",
279  cb, codebook_setup->dimensions);
280  ret = AVERROR_INVALIDDATA;
281  goto error;
282  }
283  entries = get_bits(gb, 24);
284  if (entries > V_MAX_VLCS) {
286  " %u. Codebook has too many entries (%u).\n",
287  cb, entries);
288  ret = AVERROR_INVALIDDATA;
289  goto error;
290  }
291 
292  ordered = get_bits1(gb);
293 
294  av_dlog(NULL, " codebook_dimensions %d, codebook_entries %u\n",
295  codebook_setup->dimensions, entries);
296 
297  if (!ordered) {
298  unsigned ce, flag;
299  unsigned sparse = get_bits1(gb);
300 
301  av_dlog(NULL, " not ordered \n");
302 
303  if (sparse) {
304  av_dlog(NULL, " sparse \n");
305 
306  used_entries = 0;
307  for (ce = 0; ce < entries; ++ce) {
308  flag = get_bits1(gb);
309  if (flag) {
310  tmp_vlc_bits[ce] = get_bits(gb, 5) + 1;
311  ++used_entries;
312  } else
313  tmp_vlc_bits[ce] = 0;
314  }
315  } else {
316  av_dlog(NULL, " not sparse \n");
317 
318  used_entries = entries;
319  for (ce = 0; ce < entries; ++ce)
320  tmp_vlc_bits[ce] = get_bits(gb, 5) + 1;
321  }
322  } else {
323  unsigned current_entry = 0;
324  unsigned current_length = get_bits(gb, 5) + 1;
325 
326  av_dlog(NULL, " ordered, current length: %u\n", current_length); //FIXME
327 
328  used_entries = entries;
329  for (; current_entry < used_entries && current_length <= 32; ++current_length) {
330  unsigned i, number;
331 
332  av_dlog(NULL, " number bits: %u ", ilog(entries - current_entry));
333 
334  number = get_bits(gb, ilog(entries - current_entry));
335 
336  av_dlog(NULL, " number: %u\n", number);
337 
338  for (i = current_entry; i < number+current_entry; ++i)
339  if (i < used_entries)
340  tmp_vlc_bits[i] = current_length;
341 
342  current_entry+=number;
343  }
344  if (current_entry>used_entries) {
345  av_log(vc->avctx, AV_LOG_ERROR, " More codelengths than codes in codebook. \n");
346  ret = AVERROR_INVALIDDATA;
347  goto error;
348  }
349  }
350 
351  codebook_setup->lookup_type = get_bits(gb, 4);
352 
353  av_dlog(NULL, " lookup type: %d : %s \n", codebook_setup->lookup_type,
354  codebook_setup->lookup_type ? "vq" : "no lookup");
355 
356 // If the codebook is used for (inverse) VQ, calculate codevectors.
357 
358  if (codebook_setup->lookup_type == 1) {
359  unsigned i, j, k;
360  unsigned codebook_lookup_values = ff_vorbis_nth_root(entries, codebook_setup->dimensions);
361 
362  float codebook_minimum_value = vorbisfloat2float(get_bits_long(gb, 32));
363  float codebook_delta_value = vorbisfloat2float(get_bits_long(gb, 32));
364  unsigned codebook_value_bits = get_bits(gb, 4) + 1;
365  unsigned codebook_sequence_p = get_bits1(gb);
366 
367  av_dlog(NULL, " We expect %d numbers for building the codevectors. \n",
368  codebook_lookup_values);
369  av_dlog(NULL, " delta %f minmum %f \n",
370  codebook_delta_value, codebook_minimum_value);
371 
372  for (i = 0; i < codebook_lookup_values; ++i) {
373  codebook_multiplicands[i] = get_bits(gb, codebook_value_bits);
374 
375  av_dlog(NULL, " multiplicands*delta+minmum : %e \n",
376  (float)codebook_multiplicands[i] * codebook_delta_value + codebook_minimum_value);
377  av_dlog(NULL, " multiplicand %u\n", codebook_multiplicands[i]);
378  }
379 
380 // Weed out unused vlcs and build codevector vector
381  codebook_setup->codevectors = used_entries ? av_mallocz_array(used_entries,
382  codebook_setup->dimensions *
383  sizeof(*codebook_setup->codevectors))
384  : NULL;
385  for (j = 0, i = 0; i < entries; ++i) {
386  unsigned dim = codebook_setup->dimensions;
387 
388  if (tmp_vlc_bits[i]) {
389  float last = 0.0;
390  unsigned lookup_offset = i;
391 
392  av_dlog(vc->avctx, "Lookup offset %u ,", i);
393 
394  for (k = 0; k < dim; ++k) {
395  unsigned multiplicand_offset = lookup_offset % codebook_lookup_values;
396  codebook_setup->codevectors[j * dim + k] = codebook_multiplicands[multiplicand_offset] * codebook_delta_value + codebook_minimum_value + last;
397  if (codebook_sequence_p)
398  last = codebook_setup->codevectors[j * dim + k];
399  lookup_offset/=codebook_lookup_values;
400  }
401  tmp_vlc_bits[j] = tmp_vlc_bits[i];
402 
403  av_dlog(vc->avctx, "real lookup offset %u, vector: ", j);
404  for (k = 0; k < dim; ++k)
405  av_dlog(vc->avctx, " %f ",
406  codebook_setup->codevectors[j * dim + k]);
407  av_dlog(vc->avctx, "\n");
408 
409  ++j;
410  }
411  }
412  if (j != used_entries) {
413  av_log(vc->avctx, AV_LOG_ERROR, "Bug in codevector vector building code. \n");
414  ret = AVERROR_INVALIDDATA;
415  goto error;
416  }
417  entries = used_entries;
418  } else if (codebook_setup->lookup_type >= 2) {
419  av_log(vc->avctx, AV_LOG_ERROR, "Codebook lookup type not supported. \n");
420  ret = AVERROR_INVALIDDATA;
421  goto error;
422  }
423 
424 // Initialize VLC table
425  if (ff_vorbis_len2vlc(tmp_vlc_bits, tmp_vlc_codes, entries)) {
426  av_log(vc->avctx, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");
427  ret = AVERROR_INVALIDDATA;
428  goto error;
429  }
430  codebook_setup->maxdepth = 0;
431  for (t = 0; t < entries; ++t)
432  if (tmp_vlc_bits[t] >= codebook_setup->maxdepth)
433  codebook_setup->maxdepth = tmp_vlc_bits[t];
434 
435  if (codebook_setup->maxdepth > 3 * V_NB_BITS)
436  codebook_setup->nb_bits = V_NB_BITS2;
437  else
438  codebook_setup->nb_bits = V_NB_BITS;
439 
440  codebook_setup->maxdepth = (codebook_setup->maxdepth+codebook_setup->nb_bits - 1) / codebook_setup->nb_bits;
441 
442  if ((ret = init_vlc(&codebook_setup->vlc, codebook_setup->nb_bits,
443  entries, tmp_vlc_bits, sizeof(*tmp_vlc_bits),
444  sizeof(*tmp_vlc_bits), tmp_vlc_codes,
445  sizeof(*tmp_vlc_codes), sizeof(*tmp_vlc_codes),
446  INIT_VLC_LE))) {
447  av_log(vc->avctx, AV_LOG_ERROR, " Error generating vlc tables. \n");
448  goto error;
449  }
450  }
451 
452  av_free(tmp_vlc_bits);
453  av_free(tmp_vlc_codes);
454  av_free(codebook_multiplicands);
455  return 0;
456 
457 // Error:
458 error:
459  av_free(tmp_vlc_bits);
460  av_free(tmp_vlc_codes);
461  av_free(codebook_multiplicands);
462  return ret;
463 }
464 
465 // Process time domain transforms part (unused in Vorbis I)
466 
468 {
469  GetBitContext *gb = &vc->gb;
470  unsigned i, vorbis_time_count = get_bits(gb, 6) + 1;
471 
472  for (i = 0; i < vorbis_time_count; ++i) {
473  unsigned vorbis_tdtransform = get_bits(gb, 16);
474 
475  av_dlog(NULL, " Vorbis time domain transform %u: %u\n",
476  vorbis_time_count, vorbis_tdtransform);
477 
478  if (vorbis_tdtransform) {
479  av_log(vc->avctx, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n");
480  return AVERROR_INVALIDDATA;
481  }
482  }
483  return 0;
484 }
485 
486 // Process floors part
487 
488 static int vorbis_floor0_decode(vorbis_context *vc,
489  vorbis_floor_data *vfu, float *vec);
490 static int create_map(vorbis_context *vc, unsigned floor_number);
491 static int vorbis_floor1_decode(vorbis_context *vc,
492  vorbis_floor_data *vfu, float *vec);
494 {
495  GetBitContext *gb = &vc->gb;
496  int i, j, k, ret;
497 
498  vc->floor_count = get_bits(gb, 6) + 1;
499 
500  vc->floors = av_mallocz(vc->floor_count * sizeof(*vc->floors));
501  if (!vc->floors)
502  return AVERROR(ENOMEM);
503 
504  for (i = 0; i < vc->floor_count; ++i) {
505  vorbis_floor *floor_setup = &vc->floors[i];
506 
507  floor_setup->floor_type = get_bits(gb, 16);
508 
509  av_dlog(NULL, " %d. floor type %d \n", i, floor_setup->floor_type);
510 
511  if (floor_setup->floor_type == 1) {
512  int maximum_class = -1;
513  unsigned rangebits, rangemax, floor1_values = 2;
514 
515  floor_setup->decode = vorbis_floor1_decode;
516 
517  floor_setup->data.t1.partitions = get_bits(gb, 5);
518 
519  av_dlog(NULL, " %d.floor: %d partitions \n",
520  i, floor_setup->data.t1.partitions);
521 
522  for (j = 0; j < floor_setup->data.t1.partitions; ++j) {
523  floor_setup->data.t1.partition_class[j] = get_bits(gb, 4);
524  if (floor_setup->data.t1.partition_class[j] > maximum_class)
525  maximum_class = floor_setup->data.t1.partition_class[j];
526 
527  av_dlog(NULL, " %d. floor %d partition class %d \n",
528  i, j, floor_setup->data.t1.partition_class[j]);
529 
530  }
531 
532  av_dlog(NULL, " maximum class %d \n", maximum_class);
533 
534  for (j = 0; j <= maximum_class; ++j) {
535  floor_setup->data.t1.class_dimensions[j] = get_bits(gb, 3) + 1;
536  floor_setup->data.t1.class_subclasses[j] = get_bits(gb, 2);
537 
538  av_dlog(NULL, " %d floor %d class dim: %d subclasses %d \n", i, j,
539  floor_setup->data.t1.class_dimensions[j],
540  floor_setup->data.t1.class_subclasses[j]);
541 
542  if (floor_setup->data.t1.class_subclasses[j]) {
544 
545  av_dlog(NULL, " masterbook: %d \n", floor_setup->data.t1.class_masterbook[j]);
546  }
547 
548  for (k = 0; k < (1 << floor_setup->data.t1.class_subclasses[j]); ++k) {
549  int16_t bits = get_bits(gb, 8) - 1;
550  if (bits != -1)
551  VALIDATE_INDEX(bits, vc->codebook_count)
552  floor_setup->data.t1.subclass_books[j][k] = bits;
553 
554  av_dlog(NULL, " book %d. : %d \n", k, floor_setup->data.t1.subclass_books[j][k]);
555  }
556  }
557 
558  floor_setup->data.t1.multiplier = get_bits(gb, 2) + 1;
559  floor_setup->data.t1.x_list_dim = 2;
560 
561  for (j = 0; j < floor_setup->data.t1.partitions; ++j)
562  floor_setup->data.t1.x_list_dim+=floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];
563 
564  floor_setup->data.t1.list = av_mallocz_array(floor_setup->data.t1.x_list_dim,
565  sizeof(*floor_setup->data.t1.list));
566  if (!floor_setup->data.t1.list)
567  return AVERROR(ENOMEM);
568 
569  rangebits = get_bits(gb, 4);
570  rangemax = (1 << rangebits);
571  if (rangemax > vc->blocksize[1] / 2) {
573  "Floor value is too large for blocksize: %u (%"PRIu32")\n",
574  rangemax, vc->blocksize[1] / 2);
575  return AVERROR_INVALIDDATA;
576  }
577  floor_setup->data.t1.list[0].x = 0;
578  floor_setup->data.t1.list[1].x = rangemax;
579 
580  for (j = 0; j < floor_setup->data.t1.partitions; ++j) {
581  for (k = 0; k < floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]]; ++k, ++floor1_values) {
582  floor_setup->data.t1.list[floor1_values].x = get_bits(gb, rangebits);
583 
584  av_dlog(NULL, " %u. floor1 Y coord. %d\n", floor1_values,
585  floor_setup->data.t1.list[floor1_values].x);
586  }
587  }
588 
589 // Precalculate order of x coordinates - needed for decode
591  floor_setup->data.t1.list,
592  floor_setup->data.t1.x_list_dim)) {
593  return AVERROR_INVALIDDATA;
594  }
595  } else if (floor_setup->floor_type == 0) {
596  unsigned max_codebook_dim = 0;
597 
598  floor_setup->decode = vorbis_floor0_decode;
599 
600  floor_setup->data.t0.order = get_bits(gb, 8);
601  if (!floor_setup->data.t0.order) {
602  av_log(vc->avctx, AV_LOG_ERROR, "Floor 0 order is 0.\n");
603  return AVERROR_INVALIDDATA;
604  }
605  floor_setup->data.t0.rate = get_bits(gb, 16);
606  if (!floor_setup->data.t0.rate) {
607  av_log(vc->avctx, AV_LOG_ERROR, "Floor 0 rate is 0.\n");
608  return AVERROR_INVALIDDATA;
609  }
610  floor_setup->data.t0.bark_map_size = get_bits(gb, 16);
611  if (!floor_setup->data.t0.bark_map_size) {
613  "Floor 0 bark map size is 0.\n");
614  return AVERROR_INVALIDDATA;
615  }
616  floor_setup->data.t0.amplitude_bits = get_bits(gb, 6);
617  floor_setup->data.t0.amplitude_offset = get_bits(gb, 8);
618  floor_setup->data.t0.num_books = get_bits(gb, 4) + 1;
619 
620  /* allocate mem for booklist */
621  floor_setup->data.t0.book_list =
622  av_malloc(floor_setup->data.t0.num_books);
623  if (!floor_setup->data.t0.book_list)
624  return AVERROR(ENOMEM);
625  /* read book indexes */
626  {
627  int idx;
628  unsigned book_idx;
629  for (idx = 0; idx < floor_setup->data.t0.num_books; ++idx) {
630  GET_VALIDATED_INDEX(book_idx, 8, vc->codebook_count)
631  floor_setup->data.t0.book_list[idx] = book_idx;
632  if (vc->codebooks[book_idx].dimensions > max_codebook_dim)
633  max_codebook_dim = vc->codebooks[book_idx].dimensions;
634  }
635  }
636 
637  if ((ret = create_map(vc, i)) < 0)
638  return ret;
639 
640  /* codebook dim is for padding if codebook dim doesn't *
641  * divide order+1 then we need to read more data */
642  floor_setup->data.t0.lsp =
643  av_malloc_array((floor_setup->data.t0.order + 1 + max_codebook_dim),
644  sizeof(*floor_setup->data.t0.lsp));
645  if (!floor_setup->data.t0.lsp)
646  return AVERROR(ENOMEM);
647 
648  /* debug output parsed headers */
649  av_dlog(NULL, "floor0 order: %u\n", floor_setup->data.t0.order);
650  av_dlog(NULL, "floor0 rate: %u\n", floor_setup->data.t0.rate);
651  av_dlog(NULL, "floor0 bark map size: %u\n",
652  floor_setup->data.t0.bark_map_size);
653  av_dlog(NULL, "floor0 amplitude bits: %u\n",
654  floor_setup->data.t0.amplitude_bits);
655  av_dlog(NULL, "floor0 amplitude offset: %u\n",
656  floor_setup->data.t0.amplitude_offset);
657  av_dlog(NULL, "floor0 number of books: %u\n",
658  floor_setup->data.t0.num_books);
659  av_dlog(NULL, "floor0 book list pointer: %p\n",
660  floor_setup->data.t0.book_list);
661  {
662  int idx;
663  for (idx = 0; idx < floor_setup->data.t0.num_books; ++idx) {
664  av_dlog(NULL, " Book %d: %u\n", idx + 1,
665  floor_setup->data.t0.book_list[idx]);
666  }
667  }
668  } else {
669  av_log(vc->avctx, AV_LOG_ERROR, "Invalid floor type!\n");
670  return AVERROR_INVALIDDATA;
671  }
672  }
673  return 0;
674 }
675 
676 // Process residues part
677 
679 {
680  GetBitContext *gb = &vc->gb;
681  unsigned i, j, k;
682 
683  vc->residue_count = get_bits(gb, 6)+1;
684  vc->residues = av_mallocz(vc->residue_count * sizeof(*vc->residues));
685  if (!vc->residues)
686  return AVERROR(ENOMEM);
687 
688  av_dlog(NULL, " There are %d residues. \n", vc->residue_count);
689 
690  for (i = 0; i < vc->residue_count; ++i) {
691  vorbis_residue *res_setup = &vc->residues[i];
692  uint8_t cascade[64];
693  unsigned high_bits, low_bits;
694 
695  res_setup->type = get_bits(gb, 16);
696 
697  av_dlog(NULL, " %u. residue type %d\n", i, res_setup->type);
698 
699  res_setup->begin = get_bits(gb, 24);
700  res_setup->end = get_bits(gb, 24);
701  res_setup->partition_size = get_bits(gb, 24) + 1;
702  /* Validations to prevent a buffer overflow later. */
703  if (res_setup->begin>res_setup->end ||
704  (res_setup->end-res_setup->begin) / res_setup->partition_size > FFMIN(V_MAX_PARTITIONS, 65535)) {
706  "partition out of bounds: type, begin, end, size, blocksize: %"PRIu16", %"PRIu32", %"PRIu32", %u, %"PRIu32"\n",
707  res_setup->type, res_setup->begin, res_setup->end,
708  res_setup->partition_size, vc->blocksize[1] / 2);
709  return AVERROR_INVALIDDATA;
710  }
711 
712  res_setup->classifications = get_bits(gb, 6) + 1;
713  GET_VALIDATED_INDEX(res_setup->classbook, 8, vc->codebook_count)
714 
715  res_setup->ptns_to_read =
716  (res_setup->end - res_setup->begin) / res_setup->partition_size;
717  res_setup->classifs = av_malloc_array(res_setup->ptns_to_read,
718  vc->audio_channels *
719  sizeof(*res_setup->classifs));
720  if (!res_setup->classifs)
721  return AVERROR(ENOMEM);
722 
723  av_dlog(NULL, " begin %d end %d part.size %d classif.s %d classbook %d \n",
724  res_setup->begin, res_setup->end, res_setup->partition_size,
725  res_setup->classifications, res_setup->classbook);
726 
727  for (j = 0; j < res_setup->classifications; ++j) {
728  high_bits = 0;
729  low_bits = get_bits(gb, 3);
730  if (get_bits1(gb))
731  high_bits = get_bits(gb, 5);
732  cascade[j] = (high_bits << 3) + low_bits;
733 
734  av_dlog(NULL, " %u class cascade depth: %d\n", j, ilog(cascade[j]));
735  }
736 
737  res_setup->maxpass = 0;
738  for (j = 0; j < res_setup->classifications; ++j) {
739  for (k = 0; k < 8; ++k) {
740  if (cascade[j]&(1 << k)) {
741  GET_VALIDATED_INDEX(res_setup->books[j][k], 8, vc->codebook_count)
742 
743  av_dlog(NULL, " %u class cascade depth %u book: %d\n",
744  j, k, res_setup->books[j][k]);
745 
746  if (k>res_setup->maxpass)
747  res_setup->maxpass = k;
748  } else {
749  res_setup->books[j][k] = -1;
750  }
751  }
752  }
753  }
754  return 0;
755 }
756 
757 // Process mappings part
758 
760 {
761  GetBitContext *gb = &vc->gb;
762  unsigned i, j;
763 
764  vc->mapping_count = get_bits(gb, 6)+1;
765  vc->mappings = av_mallocz(vc->mapping_count * sizeof(*vc->mappings));
766  if (!vc->mappings)
767  return AVERROR(ENOMEM);
768 
769  av_dlog(NULL, " There are %d mappings. \n", vc->mapping_count);
770 
771  for (i = 0; i < vc->mapping_count; ++i) {
772  vorbis_mapping *mapping_setup = &vc->mappings[i];
773 
774  if (get_bits(gb, 16)) {
775  av_log(vc->avctx, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n");
776  return AVERROR_INVALIDDATA;
777  }
778  if (get_bits1(gb)) {
779  mapping_setup->submaps = get_bits(gb, 4) + 1;
780  } else {
781  mapping_setup->submaps = 1;
782  }
783 
784  if (get_bits1(gb)) {
785  mapping_setup->coupling_steps = get_bits(gb, 8) + 1;
786  mapping_setup->magnitude = av_mallocz(mapping_setup->coupling_steps *
787  sizeof(*mapping_setup->magnitude));
788  mapping_setup->angle = av_mallocz(mapping_setup->coupling_steps *
789  sizeof(*mapping_setup->angle));
790  if (!mapping_setup->angle || !mapping_setup->magnitude)
791  return AVERROR(ENOMEM);
792 
793  for (j = 0; j < mapping_setup->coupling_steps; ++j) {
794  GET_VALIDATED_INDEX(mapping_setup->magnitude[j], ilog(vc->audio_channels - 1), vc->audio_channels)
795  GET_VALIDATED_INDEX(mapping_setup->angle[j], ilog(vc->audio_channels - 1), vc->audio_channels)
796  }
797  } else {
798  mapping_setup->coupling_steps = 0;
799  }
800 
801  av_dlog(NULL, " %u mapping coupling steps: %d\n",
802  i, mapping_setup->coupling_steps);
803 
804  if (get_bits(gb, 2)) {
805  av_log(vc->avctx, AV_LOG_ERROR, "%u. mapping setup data invalid.\n", i);
806  return AVERROR_INVALIDDATA; // following spec.
807  }
808 
809  if (mapping_setup->submaps>1) {
810  mapping_setup->mux = av_mallocz_array(vc->audio_channels,
811  sizeof(*mapping_setup->mux));
812  if (!mapping_setup->mux)
813  return AVERROR(ENOMEM);
814 
815  for (j = 0; j < vc->audio_channels; ++j)
816  mapping_setup->mux[j] = get_bits(gb, 4);
817  }
818 
819  for (j = 0; j < mapping_setup->submaps; ++j) {
820  skip_bits(gb, 8); // FIXME check?
821  GET_VALIDATED_INDEX(mapping_setup->submap_floor[j], 8, vc->floor_count)
822  GET_VALIDATED_INDEX(mapping_setup->submap_residue[j], 8, vc->residue_count)
823 
824  av_dlog(NULL, " %u mapping %u submap : floor %d, residue %d\n", i, j,
825  mapping_setup->submap_floor[j],
826  mapping_setup->submap_residue[j]);
827  }
828  }
829  return 0;
830 }
831 
832 // Process modes part
833 
834 static int create_map(vorbis_context *vc, unsigned floor_number)
835 {
836  vorbis_floor *floors = vc->floors;
837  vorbis_floor0 *vf;
838  int idx;
839  int blockflag, n;
840  int32_t *map;
841 
842  for (blockflag = 0; blockflag < 2; ++blockflag) {
843  n = vc->blocksize[blockflag] / 2;
844  floors[floor_number].data.t0.map[blockflag] =
845  av_malloc_array(n + 1, sizeof(int32_t)); // n + sentinel
846  if (!floors[floor_number].data.t0.map[blockflag])
847  return AVERROR(ENOMEM);
848 
849  map = floors[floor_number].data.t0.map[blockflag];
850  vf = &floors[floor_number].data.t0;
851 
852  for (idx = 0; idx < n; ++idx) {
853  map[idx] = floor(BARK((vf->rate * idx) / (2.0f * n)) *
854  (vf->bark_map_size / BARK(vf->rate / 2.0f)));
855  if (vf->bark_map_size-1 < map[idx])
856  map[idx] = vf->bark_map_size - 1;
857  }
858  map[n] = -1;
859  vf->map_size[blockflag] = n;
860  }
861 
862  for (idx = 0; idx <= n; ++idx) {
863  av_dlog(NULL, "floor0 map: map at pos %d is %d\n", idx, map[idx]);
864  }
865 
866  return 0;
867 }
868 
870 {
871  GetBitContext *gb = &vc->gb;
872  unsigned i;
873 
874  vc->mode_count = get_bits(gb, 6) + 1;
875  vc->modes = av_mallocz(vc->mode_count * sizeof(*vc->modes));
876  if (!vc->modes)
877  return AVERROR(ENOMEM);
878 
879  av_dlog(NULL, " There are %d modes.\n", vc->mode_count);
880 
881  for (i = 0; i < vc->mode_count; ++i) {
882  vorbis_mode *mode_setup = &vc->modes[i];
883 
884  mode_setup->blockflag = get_bits1(gb);
885  mode_setup->windowtype = get_bits(gb, 16); //FIXME check
886  mode_setup->transformtype = get_bits(gb, 16); //FIXME check
887  GET_VALIDATED_INDEX(mode_setup->mapping, 8, vc->mapping_count);
888 
889  av_dlog(NULL, " %u mode: blockflag %d, windowtype %d, transformtype %d, mapping %d\n",
890  i, mode_setup->blockflag, mode_setup->windowtype,
891  mode_setup->transformtype, mode_setup->mapping);
892  }
893  return 0;
894 }
895 
896 // Process the whole setup header using the functions above
897 
899 {
900  GetBitContext *gb = &vc->gb;
901  int ret;
902 
903  if ((get_bits(gb, 8) != 'v') || (get_bits(gb, 8) != 'o') ||
904  (get_bits(gb, 8) != 'r') || (get_bits(gb, 8) != 'b') ||
905  (get_bits(gb, 8) != 'i') || (get_bits(gb, 8) != 's')) {
906  av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n");
907  return AVERROR_INVALIDDATA;
908  }
909 
910  if ((ret = vorbis_parse_setup_hdr_codebooks(vc))) {
911  av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n");
912  return ret;
913  }
914  if ((ret = vorbis_parse_setup_hdr_tdtransforms(vc))) {
915  av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n");
916  return ret;
917  }
918  if ((ret = vorbis_parse_setup_hdr_floors(vc))) {
919  av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n");
920  return ret;
921  }
922  if ((ret = vorbis_parse_setup_hdr_residues(vc))) {
923  av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n");
924  return ret;
925  }
926  if ((ret = vorbis_parse_setup_hdr_mappings(vc))) {
927  av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n");
928  return ret;
929  }
930  if ((ret = vorbis_parse_setup_hdr_modes(vc))) {
931  av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n");
932  return ret;
933  }
934  if (!get_bits1(gb)) {
935  av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n");
936  return AVERROR_INVALIDDATA; // framing flag bit unset error
937  }
938 
939  return 0;
940 }
941 
942 // Process the identification header
943 
945 {
946  GetBitContext *gb = &vc->gb;
947  unsigned bl0, bl1;
948 
949  if ((get_bits(gb, 8) != 'v') || (get_bits(gb, 8) != 'o') ||
950  (get_bits(gb, 8) != 'r') || (get_bits(gb, 8) != 'b') ||
951  (get_bits(gb, 8) != 'i') || (get_bits(gb, 8) != 's')) {
952  av_log(vc->avctx, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n");
953  return AVERROR_INVALIDDATA;
954  }
955 
956  vc->version = get_bits_long(gb, 32); //FIXME check 0
957  vc->audio_channels = get_bits(gb, 8);
958  if (vc->audio_channels <= 0) {
959  av_log(vc->avctx, AV_LOG_ERROR, "Invalid number of channels\n");
960  return AVERROR_INVALIDDATA;
961  }
962  vc->audio_samplerate = get_bits_long(gb, 32);
963  if (vc->audio_samplerate <= 0) {
964  av_log(vc->avctx, AV_LOG_ERROR, "Invalid samplerate\n");
965  return AVERROR_INVALIDDATA;
966  }
967  vc->bitrate_maximum = get_bits_long(gb, 32);
968  vc->bitrate_nominal = get_bits_long(gb, 32);
969  vc->bitrate_minimum = get_bits_long(gb, 32);
970  bl0 = get_bits(gb, 4);
971  bl1 = get_bits(gb, 4);
972  if (bl0 > 13 || bl0 < 6 || bl1 > 13 || bl1 < 6 || bl1 < bl0) {
973  av_log(vc->avctx, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n");
974  return AVERROR_INVALIDDATA;
975  }
976  vc->blocksize[0] = (1 << bl0);
977  vc->blocksize[1] = (1 << bl1);
978  vc->win[0] = ff_vorbis_vwin[bl0 - 6];
979  vc->win[1] = ff_vorbis_vwin[bl1 - 6];
980 
981  if ((get_bits1(gb)) == 0) {
982  av_log(vc->avctx, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n");
983  return AVERROR_INVALIDDATA;
984  }
985 
986  vc->channel_residues = av_malloc_array(vc->blocksize[1] / 2, vc->audio_channels * sizeof(*vc->channel_residues));
987  vc->saved = av_mallocz_array(vc->blocksize[1] / 4, vc->audio_channels * sizeof(*vc->saved));
988  if (!vc->channel_residues || !vc->saved)
989  return AVERROR(ENOMEM);
990 
991  vc->previous_window = -1;
992 
993  ff_mdct_init(&vc->mdct[0], bl0, 1, -1.0);
994  ff_mdct_init(&vc->mdct[1], bl1, 1, -1.0);
995 
996  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 ",
998 
999 /*
1000  BLK = vc->blocksize[0];
1001  for (i = 0; i < BLK / 2; ++i) {
1002  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)));
1003  }
1004 */
1005 
1006  return 0;
1007 }
1008 
1009 // Process the extradata using the functions above (identification header, setup header)
1010 
1012 {
1013  vorbis_context *vc = avctx->priv_data;
1014  uint8_t *headers = avctx->extradata;
1015  int headers_len = avctx->extradata_size;
1016  uint8_t *header_start[3];
1017  int header_len[3];
1018  GetBitContext *gb = &vc->gb;
1019  int hdr_type, ret;
1020 
1021  vc->avctx = avctx;
1022  ff_vorbisdsp_init(&vc->dsp);
1024  ff_fmt_convert_init(&vc->fmt_conv, avctx);
1025 
1026  avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
1027 
1028  if (!headers_len) {
1029  av_log(avctx, AV_LOG_ERROR, "Extradata missing.\n");
1030  return AVERROR_INVALIDDATA;
1031  }
1032 
1033  if ((ret = avpriv_split_xiph_headers(headers, headers_len, 30, header_start, header_len)) < 0) {
1034  av_log(avctx, AV_LOG_ERROR, "Extradata corrupt.\n");
1035  return ret;
1036  }
1037 
1038  init_get_bits(gb, header_start[0], header_len[0]*8);
1039  hdr_type = get_bits(gb, 8);
1040  if (hdr_type != 1) {
1041  av_log(avctx, AV_LOG_ERROR, "First header is not the id header.\n");
1042  return AVERROR_INVALIDDATA;
1043  }
1044  if ((ret = vorbis_parse_id_hdr(vc))) {
1045  av_log(avctx, AV_LOG_ERROR, "Id header corrupt.\n");
1046  vorbis_free(vc);
1047  return ret;
1048  }
1049 
1050  init_get_bits(gb, header_start[2], header_len[2]*8);
1051  hdr_type = get_bits(gb, 8);
1052  if (hdr_type != 5) {
1053  av_log(avctx, AV_LOG_ERROR, "Third header is not the setup header.\n");
1054  vorbis_free(vc);
1055  return AVERROR_INVALIDDATA;
1056  }
1057  if ((ret = vorbis_parse_setup_hdr(vc))) {
1058  av_log(avctx, AV_LOG_ERROR, "Setup header corrupt.\n");
1059  vorbis_free(vc);
1060  return ret;
1061  }
1062 
1063  if (vc->audio_channels > 8)
1064  avctx->channel_layout = 0;
1065  else
1067 
1068  avctx->channels = vc->audio_channels;
1069  avctx->sample_rate = vc->audio_samplerate;
1070 
1071  return 0;
1072 }
1073 
1074 // Decode audiopackets -------------------------------------------------
1075 
1076 // Read and decode floor
1077 
1079  vorbis_floor_data *vfu, float *vec)
1080 {
1081  vorbis_floor0 *vf = &vfu->t0;
1082  float *lsp = vf->lsp;
1083  unsigned amplitude, book_idx;
1084  unsigned blockflag = vc->modes[vc->mode_number].blockflag;
1085 
1086  if (!vf->amplitude_bits)
1087  return 1;
1088 
1089  amplitude = get_bits(&vc->gb, vf->amplitude_bits);
1090  if (amplitude > 0) {
1091  float last = 0;
1092  unsigned idx, lsp_len = 0;
1093  vorbis_codebook codebook;
1094 
1095  book_idx = get_bits(&vc->gb, ilog(vf->num_books));
1096  if (book_idx >= vf->num_books) {
1097  av_log(vc->avctx, AV_LOG_ERROR, "floor0 dec: booknumber too high!\n");
1098  book_idx = 0;
1099  }
1100  av_dlog(NULL, "floor0 dec: booknumber: %u\n", book_idx);
1101  codebook = vc->codebooks[vf->book_list[book_idx]];
1102  /* Invalid codebook! */
1103  if (!codebook.codevectors)
1104  return AVERROR_INVALIDDATA;
1105 
1106  while (lsp_len<vf->order) {
1107  int vec_off;
1108 
1109  av_dlog(NULL, "floor0 dec: book dimension: %d\n", codebook.dimensions);
1110  av_dlog(NULL, "floor0 dec: maximum depth: %d\n", codebook.maxdepth);
1111  /* read temp vector */
1112  vec_off = get_vlc2(&vc->gb, codebook.vlc.table,
1113  codebook.nb_bits, codebook.maxdepth)
1114  * codebook.dimensions;
1115  av_dlog(NULL, "floor0 dec: vector offset: %d\n", vec_off);
1116  /* copy each vector component and add last to it */
1117  for (idx = 0; idx < codebook.dimensions; ++idx)
1118  lsp[lsp_len+idx] = codebook.codevectors[vec_off+idx] + last;
1119  last = lsp[lsp_len+idx-1]; /* set last to last vector component */
1120 
1121  lsp_len += codebook.dimensions;
1122  }
1123  /* DEBUG: output lsp coeffs */
1124  {
1125  int idx;
1126  for (idx = 0; idx < lsp_len; ++idx)
1127  av_dlog(NULL, "floor0 dec: coeff at %d is %f\n", idx, lsp[idx]);
1128  }
1129 
1130  /* synthesize floor output vector */
1131  {
1132  int i;
1133  int order = vf->order;
1134  float wstep = M_PI / vf->bark_map_size;
1135 
1136  for (i = 0; i < order; i++)
1137  lsp[i] = 2.0f * cos(lsp[i]);
1138 
1139  av_dlog(NULL, "floor0 synth: map_size = %"PRIu32"; m = %d; wstep = %f\n",
1140  vf->map_size[blockflag], order, wstep);
1141 
1142  i = 0;
1143  while (i < vf->map_size[blockflag]) {
1144  int j, iter_cond = vf->map[blockflag][i];
1145  float p = 0.5f;
1146  float q = 0.5f;
1147  float two_cos_w = 2.0f * cos(wstep * iter_cond); // needed all times
1148 
1149  /* similar part for the q and p products */
1150  for (j = 0; j + 1 < order; j += 2) {
1151  q *= lsp[j] - two_cos_w;
1152  p *= lsp[j + 1] - two_cos_w;
1153  }
1154  if (j == order) { // even order
1155  p *= p * (2.0f - two_cos_w);
1156  q *= q * (2.0f + two_cos_w);
1157  } else { // odd order
1158  q *= two_cos_w-lsp[j]; // one more time for q
1159 
1160  /* final step and square */
1161  p *= p * (4.f - two_cos_w * two_cos_w);
1162  q *= q;
1163  }
1164 
1165  /* calculate linear floor value */
1166  q = exp((((amplitude*vf->amplitude_offset) /
1167  (((1 << vf->amplitude_bits) - 1) * sqrt(p + q)))
1168  - vf->amplitude_offset) * .11512925f);
1169 
1170  /* fill vector */
1171  do {
1172  vec[i] = q; ++i;
1173  } while (vf->map[blockflag][i] == iter_cond);
1174  }
1175  }
1176  } else {
1177  /* this channel is unused */
1178  return 1;
1179  }
1180 
1181  av_dlog(NULL, " Floor0 decoded\n");
1182 
1183  return 0;
1184 }
1185 
1187  vorbis_floor_data *vfu, float *vec)
1188 {
1189  vorbis_floor1 *vf = &vfu->t1;
1190  GetBitContext *gb = &vc->gb;
1191  uint16_t range_v[4] = { 256, 128, 86, 64 };
1192  unsigned range = range_v[vf->multiplier - 1];
1193  uint16_t floor1_Y[258];
1194  uint16_t floor1_Y_final[258];
1195  int floor1_flag[258];
1196  unsigned partition_class, cdim, cbits, csub, cval, offset, i, j;
1197  int book, adx, ady, dy, off, predicted, err;
1198 
1199 
1200  if (!get_bits1(gb)) // silence
1201  return 1;
1202 
1203 // Read values (or differences) for the floor's points
1204 
1205  floor1_Y[0] = get_bits(gb, ilog(range - 1));
1206  floor1_Y[1] = get_bits(gb, ilog(range - 1));
1207 
1208  av_dlog(NULL, "floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);
1209 
1210  offset = 2;
1211  for (i = 0; i < vf->partitions; ++i) {
1212  partition_class = vf->partition_class[i];
1213  cdim = vf->class_dimensions[partition_class];
1214  cbits = vf->class_subclasses[partition_class];
1215  csub = (1 << cbits) - 1;
1216  cval = 0;
1217 
1218  av_dlog(NULL, "Cbits %u\n", cbits);
1219 
1220  if (cbits) // this reads all subclasses for this partition's class
1221  cval = get_vlc2(gb, vc->codebooks[vf->class_masterbook[partition_class]].vlc.table,
1222  vc->codebooks[vf->class_masterbook[partition_class]].nb_bits, 3);
1223 
1224  for (j = 0; j < cdim; ++j) {
1225  book = vf->subclass_books[partition_class][cval & csub];
1226 
1227  av_dlog(NULL, "book %d Cbits %u cval %u bits:%d\n",
1228  book, cbits, cval, get_bits_count(gb));
1229 
1230  cval = cval >> cbits;
1231  if (book > -1) {
1232  int v = get_vlc2(gb, vc->codebooks[book].vlc.table,
1233  vc->codebooks[book].nb_bits, 3);
1234  if (v < 0)
1235  return AVERROR_INVALIDDATA;
1236  floor1_Y[offset+j] = v;
1237  } else {
1238  floor1_Y[offset+j] = 0;
1239  }
1240 
1241  av_dlog(NULL, " floor(%d) = %d \n",
1242  vf->list[offset+j].x, floor1_Y[offset+j]);
1243  }
1244  offset+=cdim;
1245  }
1246 
1247 // Amplitude calculation from the differences
1248 
1249  floor1_flag[0] = 1;
1250  floor1_flag[1] = 1;
1251  floor1_Y_final[0] = floor1_Y[0];
1252  floor1_Y_final[1] = floor1_Y[1];
1253 
1254  for (i = 2; i < vf->x_list_dim; ++i) {
1255  unsigned val, highroom, lowroom, room, high_neigh_offs, low_neigh_offs;
1256 
1257  low_neigh_offs = vf->list[i].low;
1258  high_neigh_offs = vf->list[i].high;
1259  dy = floor1_Y_final[high_neigh_offs] - floor1_Y_final[low_neigh_offs]; // render_point begin
1260  adx = vf->list[high_neigh_offs].x - vf->list[low_neigh_offs].x;
1261  ady = FFABS(dy);
1262  err = ady * (vf->list[i].x - vf->list[low_neigh_offs].x);
1263  off = err / adx;
1264  if (dy < 0) {
1265  predicted = floor1_Y_final[low_neigh_offs] - off;
1266  } else {
1267  predicted = floor1_Y_final[low_neigh_offs] + off;
1268  } // render_point end
1269 
1270  val = floor1_Y[i];
1271  highroom = range-predicted;
1272  lowroom = predicted;
1273  if (highroom < lowroom) {
1274  room = highroom * 2;
1275  } else {
1276  room = lowroom * 2; // SPEC misspelling
1277  }
1278  if (val) {
1279  floor1_flag[low_neigh_offs] = 1;
1280  floor1_flag[high_neigh_offs] = 1;
1281  floor1_flag[i] = 1;
1282  if (val >= room) {
1283  if (highroom > lowroom) {
1284  floor1_Y_final[i] = av_clip_uint16(val - lowroom + predicted);
1285  } else {
1286  floor1_Y_final[i] = av_clip_uint16(predicted - val + highroom - 1);
1287  }
1288  } else {
1289  if (val & 1) {
1290  floor1_Y_final[i] = av_clip_uint16(predicted - (val + 1) / 2);
1291  } else {
1292  floor1_Y_final[i] = av_clip_uint16(predicted + val / 2);
1293  }
1294  }
1295  } else {
1296  floor1_flag[i] = 0;
1297  floor1_Y_final[i] = av_clip_uint16(predicted);
1298  }
1299 
1300  av_dlog(NULL, " Decoded floor(%d) = %u / val %u\n",
1301  vf->list[i].x, floor1_Y_final[i], val);
1302  }
1303 
1304 // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?
1305 
1306  ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);
1307 
1308  av_dlog(NULL, " Floor decoded\n");
1309 
1310  return 0;
1311 }
1312 
1314  vorbis_residue *vr,
1315  uint8_t *do_not_decode,
1316  unsigned ch_used,
1317  int partition_count,
1318  int ptns_to_read
1319  )
1320 {
1321  int p, j, i;
1322  unsigned c_p_c = vc->codebooks[vr->classbook].dimensions;
1323  unsigned inverse_class = ff_inverse[vr->classifications];
1324  unsigned temp, temp2;
1325  for (p = 0, j = 0; j < ch_used; ++j) {
1326  if (!do_not_decode[j]) {
1327  temp = get_vlc2(&vc->gb, vc->codebooks[vr->classbook].vlc.table,
1328  vc->codebooks[vr->classbook].nb_bits, 3);
1329 
1330  av_dlog(NULL, "Classword: %u\n", temp);
1331 
1332  if ((int)temp < 0)
1333  return temp;
1334 
1335  av_assert0(vr->classifications > 1); //needed for inverse[]
1336 
1337  if (temp <= 65536) {
1338  for (i = partition_count + c_p_c - 1; i >= partition_count; i--) {
1339  temp2 = (((uint64_t)temp) * inverse_class) >> 32;
1340 
1341  if (i < ptns_to_read)
1342  vr->classifs[p + i] = temp - temp2 * vr->classifications;
1343  temp = temp2;
1344  }
1345  } else {
1346  for (i = partition_count + c_p_c - 1; i >= partition_count; i--) {
1347  temp2 = temp / vr->classifications;
1348 
1349  if (i < ptns_to_read)
1350  vr->classifs[p + i] = temp - temp2 * vr->classifications;
1351  temp = temp2;
1352  }
1353  }
1354  }
1355  p += ptns_to_read;
1356  }
1357  return 0;
1358 }
1359 // Read and decode residue
1360 
1362  vorbis_residue *vr,
1363  unsigned ch,
1364  uint8_t *do_not_decode,
1365  float *vec,
1366  unsigned vlen,
1367  unsigned ch_left,
1368  int vr_type)
1369 {
1370  GetBitContext *gb = &vc->gb;
1371  unsigned c_p_c = vc->codebooks[vr->classbook].dimensions;
1372  uint8_t *classifs = vr->classifs;
1373  unsigned pass, ch_used, i, j, k, l;
1374  unsigned max_output = (ch - 1) * vlen;
1375  int ptns_to_read = vr->ptns_to_read;
1376  int libvorbis_bug = 0;
1377 
1378  if (vr_type == 2) {
1379  for (j = 1; j < ch; ++j)
1380  do_not_decode[0] &= do_not_decode[j]; // FIXME - clobbering input
1381  if (do_not_decode[0])
1382  return 0;
1383  ch_used = 1;
1384  max_output += vr->end / ch;
1385  } else {
1386  ch_used = ch;
1387  max_output += vr->end;
1388  }
1389 
1390  if (max_output > ch_left * vlen) {
1391  if (max_output <= ch_left * vlen + vr->partition_size*ch_used/ch) {
1392  ptns_to_read--;
1393  libvorbis_bug = 1;
1394  } else {
1395  av_log(vc->avctx, AV_LOG_ERROR, "Insufficient output buffer\n");
1396  return AVERROR_INVALIDDATA;
1397  }
1398  }
1399 
1400  av_dlog(NULL, " residue type 0/1/2 decode begin, ch: %d cpc %d \n", ch, c_p_c);
1401 
1402  for (pass = 0; pass <= vr->maxpass; ++pass) { // FIXME OPTIMIZE?
1403  int voffset, partition_count, j_times_ptns_to_read;
1404 
1405  voffset = vr->begin;
1406  for (partition_count = 0; partition_count < ptns_to_read;) { // SPEC error
1407  if (!pass) {
1408  int ret;
1409  if ((ret = setup_classifs(vc, vr, do_not_decode, ch_used, partition_count, ptns_to_read)) < 0)
1410  return ret;
1411  }
1412  for (i = 0; (i < c_p_c) && (partition_count < ptns_to_read); ++i) {
1413  for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {
1414  unsigned voffs;
1415 
1416  if (!do_not_decode[j]) {
1417  unsigned vqclass = classifs[j_times_ptns_to_read + partition_count];
1418  int vqbook = vr->books[vqclass][pass];
1419 
1420  if (vqbook >= 0 && vc->codebooks[vqbook].codevectors) {
1421  unsigned coffs;
1422  unsigned dim = vc->codebooks[vqbook].dimensions;
1423  unsigned step = FASTDIV(vr->partition_size << 1, dim << 1);
1424  vorbis_codebook codebook = vc->codebooks[vqbook];
1425 
1426  if (vr_type == 0) {
1427 
1428  voffs = voffset+j*vlen;
1429  for (k = 0; k < step; ++k) {
1430  coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1431  for (l = 0; l < dim; ++l)
1432  vec[voffs + k + l * step] += codebook.codevectors[coffs + l];
1433  }
1434  } else if (vr_type == 1) {
1435  voffs = voffset + j * vlen;
1436  for (k = 0; k < step; ++k) {
1437  coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1438  for (l = 0; l < dim; ++l, ++voffs) {
1439  vec[voffs]+=codebook.codevectors[coffs+l];
1440 
1441  av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d \n",
1442  pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);
1443  }
1444  }
1445  } else if (vr_type == 2 && ch == 2 && (voffset & 1) == 0 && (dim & 1) == 0) { // most frequent case optimized
1446  voffs = voffset >> 1;
1447 
1448  if (dim == 2) {
1449  for (k = 0; k < step; ++k) {
1450  coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;
1451  vec[voffs + k ] += codebook.codevectors[coffs ];
1452  vec[voffs + k + vlen] += codebook.codevectors[coffs + 1];
1453  }
1454  } else if (dim == 4) {
1455  for (k = 0; k < step; ++k, voffs += 2) {
1456  coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4;
1457  vec[voffs ] += codebook.codevectors[coffs ];
1458  vec[voffs + 1 ] += codebook.codevectors[coffs + 2];
1459  vec[voffs + vlen ] += codebook.codevectors[coffs + 1];
1460  vec[voffs + vlen + 1] += codebook.codevectors[coffs + 3];
1461  }
1462  } else
1463  for (k = 0; k < step; ++k) {
1464  coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1465  for (l = 0; l < dim; l += 2, voffs++) {
1466  vec[voffs ] += codebook.codevectors[coffs + l ];
1467  vec[voffs + vlen] += codebook.codevectors[coffs + l + 1];
1468 
1469  av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d+%d \n",
1470  pass, voffset / ch + (voffs % ch) * vlen,
1471  vec[voffset / ch + (voffs % ch) * vlen],
1472  codebook.codevectors[coffs + l], coffs, l);
1473  }
1474  }
1475 
1476  } else if (vr_type == 2) {
1477  unsigned voffs_div = FASTDIV(voffset << 1, ch <<1);
1478  unsigned voffs_mod = voffset - voffs_div * ch;
1479 
1480  for (k = 0; k < step; ++k) {
1481  coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1482  for (l = 0; l < dim; ++l) {
1483  vec[voffs_div + voffs_mod * vlen] +=
1484  codebook.codevectors[coffs + l];
1485 
1486  av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d+%d \n",
1487  pass, voffs_div + voffs_mod * vlen,
1488  vec[voffs_div + voffs_mod * vlen],
1489  codebook.codevectors[coffs + l], coffs, l);
1490 
1491  if (++voffs_mod == ch) {
1492  voffs_div++;
1493  voffs_mod = 0;
1494  }
1495  }
1496  }
1497  }
1498  }
1499  }
1500  j_times_ptns_to_read += ptns_to_read;
1501  }
1502  ++partition_count;
1503  voffset += vr->partition_size;
1504  }
1505  }
1506  if (libvorbis_bug && !pass) {
1507  for (j = 0; j < ch_used; ++j) {
1508  if (!do_not_decode[j]) {
1509  get_vlc2(&vc->gb, vc->codebooks[vr->classbook].vlc.table,
1510  vc->codebooks[vr->classbook].nb_bits, 3);
1511  }
1512  }
1513  }
1514  }
1515  return 0;
1516 }
1517 
1519  unsigned ch,
1520  uint8_t *do_not_decode,
1521  float *vec, unsigned vlen,
1522  unsigned ch_left)
1523 {
1524  if (vr->type == 2)
1525  return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 2);
1526  else if (vr->type == 1)
1527  return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 1);
1528  else if (vr->type == 0)
1529  return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 0);
1530  else {
1531  av_log(vc->avctx, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");
1532  return AVERROR_INVALIDDATA;
1533  }
1534 }
1535 
1536 void ff_vorbis_inverse_coupling(float *mag, float *ang, intptr_t blocksize)
1537 {
1538  int i;
1539  for (i = 0; i < blocksize; i++) {
1540  if (mag[i] > 0.0) {
1541  if (ang[i] > 0.0) {
1542  ang[i] = mag[i] - ang[i];
1543  } else {
1544  float temp = ang[i];
1545  ang[i] = mag[i];
1546  mag[i] += temp;
1547  }
1548  } else {
1549  if (ang[i] > 0.0) {
1550  ang[i] += mag[i];
1551  } else {
1552  float temp = ang[i];
1553  ang[i] = mag[i];
1554  mag[i] -= temp;
1555  }
1556  }
1557  }
1558 }
1559 
1560 // Decode the audio packet using the functions above
1561 
1562 static int vorbis_parse_audio_packet(vorbis_context *vc, float **floor_ptr)
1563 {
1564  GetBitContext *gb = &vc->gb;
1565  FFTContext *mdct;
1566  int previous_window = vc->previous_window;
1567  unsigned mode_number, blockflag, blocksize;
1568  int i, j;
1569  uint8_t no_residue[255];
1570  uint8_t do_not_decode[255];
1571  vorbis_mapping *mapping;
1572  float *ch_res_ptr = vc->channel_residues;
1573  uint8_t res_chan[255];
1574  unsigned res_num = 0;
1575  int retlen = 0;
1576  unsigned ch_left = vc->audio_channels;
1577  unsigned vlen;
1578 
1579  if (get_bits1(gb)) {
1580  av_log(vc->avctx, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");
1581  return AVERROR_INVALIDDATA; // packet type not audio
1582  }
1583 
1584  if (vc->mode_count == 1) {
1585  mode_number = 0;
1586  } else {
1587  GET_VALIDATED_INDEX(mode_number, ilog(vc->mode_count-1), vc->mode_count)
1588  }
1589  vc->mode_number = mode_number;
1590  mapping = &vc->mappings[vc->modes[mode_number].mapping];
1591 
1592  av_dlog(NULL, " Mode number: %u , mapping: %d , blocktype %d\n", mode_number,
1593  vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);
1594 
1595  blockflag = vc->modes[mode_number].blockflag;
1596  blocksize = vc->blocksize[blockflag];
1597  vlen = blocksize / 2;
1598  if (blockflag) {
1599  int code = get_bits(gb, 2);
1600  if (previous_window < 0)
1601  previous_window = code>>1;
1602  } else if (previous_window < 0)
1603  previous_window = 0;
1604 
1605  memset(ch_res_ptr, 0, sizeof(float) * vc->audio_channels * vlen); //FIXME can this be removed ?
1606  for (i = 0; i < vc->audio_channels; ++i)
1607  memset(floor_ptr[i], 0, vlen * sizeof(floor_ptr[0][0])); //FIXME can this be removed ?
1608 
1609 // Decode floor
1610 
1611  for (i = 0; i < vc->audio_channels; ++i) {
1612  vorbis_floor *floor;
1613  int ret;
1614  if (mapping->submaps > 1) {
1615  floor = &vc->floors[mapping->submap_floor[mapping->mux[i]]];
1616  } else {
1617  floor = &vc->floors[mapping->submap_floor[0]];
1618  }
1619 
1620  ret = floor->decode(vc, &floor->data, floor_ptr[i]);
1621 
1622  if (ret < 0) {
1623  av_log(vc->avctx, AV_LOG_ERROR, "Invalid codebook in vorbis_floor_decode.\n");
1624  return AVERROR_INVALIDDATA;
1625  }
1626  no_residue[i] = ret;
1627  }
1628 
1629 // Nonzero vector propagate
1630 
1631  for (i = mapping->coupling_steps - 1; i >= 0; --i) {
1632  if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {
1633  no_residue[mapping->magnitude[i]] = 0;
1634  no_residue[mapping->angle[i]] = 0;
1635  }
1636  }
1637 
1638 // Decode residue
1639 
1640  for (i = 0; i < mapping->submaps; ++i) {
1641  vorbis_residue *residue;
1642  unsigned ch = 0;
1643  int ret;
1644 
1645  for (j = 0; j < vc->audio_channels; ++j) {
1646  if ((mapping->submaps == 1) || (i == mapping->mux[j])) {
1647  res_chan[j] = res_num;
1648  if (no_residue[j]) {
1649  do_not_decode[ch] = 1;
1650  } else {
1651  do_not_decode[ch] = 0;
1652  }
1653  ++ch;
1654  ++res_num;
1655  }
1656  }
1657  residue = &vc->residues[mapping->submap_residue[i]];
1658  if (ch_left < ch) {
1659  av_log(vc->avctx, AV_LOG_ERROR, "Too many channels in vorbis_floor_decode.\n");
1660  return AVERROR_INVALIDDATA;
1661  }
1662  if (ch) {
1663  ret = vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, vlen, ch_left);
1664  if (ret < 0)
1665  return ret;
1666  }
1667 
1668  ch_res_ptr += ch * vlen;
1669  ch_left -= ch;
1670  }
1671 
1672  if (ch_left > 0)
1673  return AVERROR_INVALIDDATA;
1674 
1675 // Inverse coupling
1676 
1677  for (i = mapping->coupling_steps - 1; i >= 0; --i) { //warning: i has to be signed
1678  float *mag, *ang;
1679 
1680  mag = vc->channel_residues+res_chan[mapping->magnitude[i]] * blocksize / 2;
1681  ang = vc->channel_residues+res_chan[mapping->angle[i]] * blocksize / 2;
1682  vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize / 2);
1683  }
1684 
1685 // Dotproduct, MDCT
1686 
1687  mdct = &vc->mdct[blockflag];
1688 
1689  for (j = vc->audio_channels-1;j >= 0; j--) {
1690  ch_res_ptr = vc->channel_residues + res_chan[j] * blocksize / 2;
1691  vc->fdsp.vector_fmul(floor_ptr[j], floor_ptr[j], ch_res_ptr, blocksize / 2);
1692  mdct->imdct_half(mdct, ch_res_ptr, floor_ptr[j]);
1693  }
1694 
1695 // Overlap/add, save data for next overlapping
1696 
1697  retlen = (blocksize + vc->blocksize[previous_window]) / 4;
1698  for (j = 0; j < vc->audio_channels; j++) {
1699  unsigned bs0 = vc->blocksize[0];
1700  unsigned bs1 = vc->blocksize[1];
1701  float *residue = vc->channel_residues + res_chan[j] * blocksize / 2;
1702  float *saved = vc->saved + j * bs1 / 4;
1703  float *ret = floor_ptr[j];
1704  float *buf = residue;
1705  const float *win = vc->win[blockflag & previous_window];
1706 
1707  if (blockflag == previous_window) {
1708  vc->fdsp.vector_fmul_window(ret, saved, buf, win, blocksize / 4);
1709  } else if (blockflag > previous_window) {
1710  vc->fdsp.vector_fmul_window(ret, saved, buf, win, bs0 / 4);
1711  memcpy(ret+bs0/2, buf+bs0/4, ((bs1-bs0)/4) * sizeof(float));
1712  } else {
1713  memcpy(ret, saved, ((bs1 - bs0) / 4) * sizeof(float));
1714  vc->fdsp.vector_fmul_window(ret + (bs1 - bs0) / 4, saved + (bs1 - bs0) / 4, buf, win, bs0 / 4);
1715  }
1716  memcpy(saved, buf + blocksize / 4, blocksize / 4 * sizeof(float));
1717  }
1718 
1719  vc->previous_window = blockflag;
1720  return retlen;
1721 }
1722 
1723 // Return the decoded audio packet through the standard api
1724 
1725 static int vorbis_decode_frame(AVCodecContext *avctx, void *data,
1726  int *got_frame_ptr, AVPacket *avpkt)
1727 {
1728  const uint8_t *buf = avpkt->data;
1729  int buf_size = avpkt->size;
1730  vorbis_context *vc = avctx->priv_data;
1731  AVFrame *frame = data;
1732  GetBitContext *gb = &vc->gb;
1733  float *channel_ptrs[255];
1734  int i, len, ret;
1735 
1736  av_dlog(NULL, "packet length %d \n", buf_size);
1737 
1738  if (*buf == 1 && buf_size > 7) {
1739  init_get_bits(gb, buf+1, buf_size*8 - 8);
1740  vorbis_free(vc);
1741  if ((ret = vorbis_parse_id_hdr(vc))) {
1742  av_log(avctx, AV_LOG_ERROR, "Id header corrupt.\n");
1743  vorbis_free(vc);
1744  return ret;
1745  }
1746 
1747  if (vc->audio_channels > 8)
1748  avctx->channel_layout = 0;
1749  else
1751 
1752  avctx->channels = vc->audio_channels;
1753  avctx->sample_rate = vc->audio_samplerate;
1754  return buf_size;
1755  }
1756 
1757  if (*buf == 3 && buf_size > 7) {
1758  av_log(avctx, AV_LOG_DEBUG, "Ignoring comment header\n");
1759  return buf_size;
1760  }
1761 
1762  if (*buf == 5 && buf_size > 7 && vc->channel_residues && !vc->modes) {
1763  init_get_bits(gb, buf+1, buf_size*8 - 8);
1764  if ((ret = vorbis_parse_setup_hdr(vc))) {
1765  av_log(avctx, AV_LOG_ERROR, "Setup header corrupt.\n");
1766  vorbis_free(vc);
1767  return ret;
1768  }
1769  return buf_size;
1770  }
1771 
1772  if (!vc->channel_residues || !vc->modes) {
1773  av_log(avctx, AV_LOG_ERROR, "Data packet before valid headers\n");
1774  return AVERROR_INVALIDDATA;
1775  }
1776 
1777  /* get output buffer */
1778  frame->nb_samples = vc->blocksize[1] / 2;
1779  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
1780  return ret;
1781 
1782  if (vc->audio_channels > 8) {
1783  for (i = 0; i < vc->audio_channels; i++)
1784  channel_ptrs[i] = (float *)frame->extended_data[i];
1785  } else {
1786  for (i = 0; i < vc->audio_channels; i++) {
1787  int ch = ff_vorbis_channel_layout_offsets[vc->audio_channels - 1][i];
1788  channel_ptrs[ch] = (float *)frame->extended_data[i];
1789  }
1790  }
1791 
1792  init_get_bits(gb, buf, buf_size*8);
1793 
1794  if ((len = vorbis_parse_audio_packet(vc, channel_ptrs)) <= 0)
1795  return len;
1796 
1797  if (!vc->first_frame) {
1798  vc->first_frame = 1;
1799  *got_frame_ptr = 0;
1800  av_frame_unref(frame);
1801  return buf_size;
1802  }
1803 
1804  av_dlog(NULL, "parsed %d bytes %d bits, returned %d samples (*ch*bits) \n",
1805  get_bits_count(gb) / 8, get_bits_count(gb) % 8, len);
1806 
1807  frame->nb_samples = len;
1808  *got_frame_ptr = 1;
1809 
1810  return buf_size;
1811 }
1812 
1813 // Close decoder
1814 
1816 {
1817  vorbis_context *vc = avctx->priv_data;
1818 
1819  vorbis_free(vc);
1820 
1821  return 0;
1822 }
1823 
1825 {
1826  vorbis_context *vc = avctx->priv_data;
1827 
1828  if (vc->saved) {
1829  memset(vc->saved, 0, (vc->blocksize[1] / 4) * vc->audio_channels *
1830  sizeof(*vc->saved));
1831  }
1832  vc->previous_window = -1;
1833  vc->first_frame = 0;
1834 }
1835 
1837  .name = "vorbis",
1838  .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),
1839  .type = AVMEDIA_TYPE_AUDIO,
1840  .id = AV_CODEC_ID_VORBIS,
1841  .priv_data_size = sizeof(vorbis_context),
1846  .capabilities = CODEC_CAP_DR1,
1847  .channel_layouts = ff_vorbis_channel_layouts,
1848  .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
1850 };