vorbisdec.c
Go to the documentation of this file.
1 /*
2  * This file is part of Libav.
3  *
4  * Libav is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * Libav is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with Libav; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
25 #include <inttypes.h>
26 #include <math.h>
27 
28 #define BITSTREAM_READER_LE
29 #include "avcodec.h"
30 #include "get_bits.h"
31 #include "dsputil.h"
32 #include "fft.h"
33 #include "fmtconvert.h"
34 
35 #include "vorbis.h"
36 #include "xiph.h"
37 
38 #define V_NB_BITS 8
39 #define V_NB_BITS2 11
40 #define V_MAX_VLCS (1 << 16)
41 #define V_MAX_PARTITIONS (1 << 20)
42 
43 #undef NDEBUG
44 #include <assert.h>
45 
46 typedef struct {
47  uint8_t dimensions;
48  uint8_t lookup_type;
49  uint8_t maxdepth;
51  float *codevectors;
52  unsigned int nb_bits;
54 
55 typedef union vorbis_floor_u vorbis_floor_data;
56 typedef struct vorbis_floor0_s vorbis_floor0;
57 typedef struct vorbis_floor1_s vorbis_floor1;
58 struct vorbis_context_s;
59 typedef
61  (struct vorbis_context_s *, vorbis_floor_data *, float *);
62 typedef struct {
63  uint8_t floor_type;
66  struct vorbis_floor0_s {
67  uint8_t order;
68  uint16_t rate;
69  uint16_t bark_map_size;
70  int32_t *map[2];
71  uint32_t map_size[2];
72  uint8_t amplitude_bits;
74  uint8_t num_books;
75  uint8_t *book_list;
76  float *lsp;
77  } t0;
78  struct vorbis_floor1_s {
79  uint8_t partitions;
80  uint8_t partition_class[32];
81  uint8_t class_dimensions[16];
82  uint8_t class_subclasses[16];
83  uint8_t class_masterbook[16];
84  int16_t subclass_books[16][8];
85  uint8_t multiplier;
86  uint16_t x_list_dim;
88  } t1;
89  } data;
90 } vorbis_floor;
91 
92 typedef struct {
93  uint16_t type;
94  uint32_t begin;
95  uint32_t end;
96  unsigned partition_size;
97  uint8_t classifications;
98  uint8_t classbook;
99  int16_t books[64][8];
100  uint8_t maxpass;
101  uint16_t ptns_to_read;
102  uint8_t *classifs;
104 
105 typedef struct {
106  uint8_t submaps;
107  uint16_t coupling_steps;
108  uint8_t *magnitude;
109  uint8_t *angle;
110  uint8_t *mux;
111  uint8_t submap_floor[16];
112  uint8_t submap_residue[16];
114 
115 typedef struct {
116  uint8_t blockflag;
117  uint16_t windowtype;
118  uint16_t transformtype;
119  uint8_t mapping;
120 } vorbis_mode;
121 
122 typedef struct vorbis_context_s {
128 
130  uint8_t first_frame;
131  uint32_t version;
132  uint8_t audio_channels;
134  uint32_t bitrate_maximum;
135  uint32_t bitrate_nominal;
136  uint32_t bitrate_minimum;
137  uint32_t blocksize[2];
138  const float *win[2];
139  uint16_t codebook_count;
141  uint8_t floor_count;
143  uint8_t residue_count;
145  uint8_t mapping_count;
147  uint8_t mode_count;
149  uint8_t mode_number; // mode number for the current packet
153  float *saved;
154  float scale_bias; // for float->int conversion
156 
157 /* Helper functions */
158 
159 #define BARK(x) \
160  (13.1f * atan(0.00074f * (x)) + 2.24f * atan(1.85e-8f * (x) * (x)) + 1e-4f * (x))
161 
162 static const char idx_err_str[] = "Index value %d out of range (0 - %d) for %s at %s:%i\n";
163 #define VALIDATE_INDEX(idx, limit) \
164  if (idx >= limit) {\
165  av_log(vc->avccontext, AV_LOG_ERROR,\
166  idx_err_str,\
167  (int)(idx), (int)(limit - 1), #idx, __FILE__, __LINE__);\
168  return AVERROR_INVALIDDATA;\
169  }
170 #define GET_VALIDATED_INDEX(idx, bits, limit) \
171  {\
172  idx = get_bits(gb, bits);\
173  VALIDATE_INDEX(idx, limit)\
174  }
175 
176 static float vorbisfloat2float(unsigned val)
177 {
178  double mant = val & 0x1fffff;
179  long exp = (val & 0x7fe00000L) >> 21;
180  if (val & 0x80000000)
181  mant = -mant;
182  return ldexp(mant, exp - 20 - 768);
183 }
184 
185 
186 // Free all allocated memory -----------------------------------------
187 
188 static void vorbis_free(vorbis_context *vc)
189 {
190  int i;
191 
193  av_freep(&vc->channel_floors);
194  av_freep(&vc->saved);
195 
196  for (i = 0; i < vc->residue_count; i++)
197  av_free(vc->residues[i].classifs);
198  av_freep(&vc->residues);
199  av_freep(&vc->modes);
200 
201  ff_mdct_end(&vc->mdct[0]);
202  ff_mdct_end(&vc->mdct[1]);
203 
204  for (i = 0; i < vc->codebook_count; ++i) {
205  av_free(vc->codebooks[i].codevectors);
206  free_vlc(&vc->codebooks[i].vlc);
207  }
208  av_freep(&vc->codebooks);
209 
210  for (i = 0; i < vc->floor_count; ++i) {
211  if (vc->floors[i].floor_type == 0) {
212  av_free(vc->floors[i].data.t0.map[0]);
213  av_free(vc->floors[i].data.t0.map[1]);
214  av_free(vc->floors[i].data.t0.book_list);
215  av_free(vc->floors[i].data.t0.lsp);
216  } else {
217  av_free(vc->floors[i].data.t1.list);
218  }
219  }
220  av_freep(&vc->floors);
221 
222  for (i = 0; i < vc->mapping_count; ++i) {
223  av_free(vc->mappings[i].magnitude);
224  av_free(vc->mappings[i].angle);
225  av_free(vc->mappings[i].mux);
226  }
227  av_freep(&vc->mappings);
228 }
229 
230 // Parse setup header -------------------------------------------------
231 
232 // Process codebooks part
233 
235 {
236  unsigned cb;
237  uint8_t *tmp_vlc_bits;
238  uint32_t *tmp_vlc_codes;
239  GetBitContext *gb = &vc->gb;
240  uint16_t *codebook_multiplicands;
241  int ret = 0;
242 
243  vc->codebook_count = get_bits(gb, 8) + 1;
244 
245  av_dlog(NULL, " Codebooks: %d \n", vc->codebook_count);
246 
247  vc->codebooks = av_mallocz(vc->codebook_count * sizeof(*vc->codebooks));
248  tmp_vlc_bits = av_mallocz(V_MAX_VLCS * sizeof(*tmp_vlc_bits));
249  tmp_vlc_codes = av_mallocz(V_MAX_VLCS * sizeof(*tmp_vlc_codes));
250  codebook_multiplicands = av_malloc(V_MAX_VLCS * sizeof(*codebook_multiplicands));
251 
252  for (cb = 0; cb < vc->codebook_count; ++cb) {
253  vorbis_codebook *codebook_setup = &vc->codebooks[cb];
254  unsigned ordered, t, entries, used_entries = 0;
255 
256  av_dlog(NULL, " %u. Codebook\n", cb);
257 
258  if (get_bits(gb, 24) != 0x564342) {
260  " %u. Codebook setup data corrupt.\n", cb);
261  ret = AVERROR_INVALIDDATA;
262  goto error;
263  }
264 
265  codebook_setup->dimensions=get_bits(gb, 16);
266  if (codebook_setup->dimensions > 16 || codebook_setup->dimensions == 0) {
268  " %u. Codebook's dimension is invalid (%d).\n",
269  cb, codebook_setup->dimensions);
270  ret = AVERROR_INVALIDDATA;
271  goto error;
272  }
273  entries = get_bits(gb, 24);
274  if (entries > V_MAX_VLCS) {
276  " %u. Codebook has too many entries (%u).\n",
277  cb, entries);
278  ret = AVERROR_INVALIDDATA;
279  goto error;
280  }
281 
282  ordered = get_bits1(gb);
283 
284  av_dlog(NULL, " codebook_dimensions %d, codebook_entries %u\n",
285  codebook_setup->dimensions, entries);
286 
287  if (!ordered) {
288  unsigned ce, flag;
289  unsigned sparse = get_bits1(gb);
290 
291  av_dlog(NULL, " not ordered \n");
292 
293  if (sparse) {
294  av_dlog(NULL, " sparse \n");
295 
296  used_entries = 0;
297  for (ce = 0; ce < entries; ++ce) {
298  flag = get_bits1(gb);
299  if (flag) {
300  tmp_vlc_bits[ce] = get_bits(gb, 5) + 1;
301  ++used_entries;
302  } else
303  tmp_vlc_bits[ce] = 0;
304  }
305  } else {
306  av_dlog(NULL, " not sparse \n");
307 
308  used_entries = entries;
309  for (ce = 0; ce < entries; ++ce)
310  tmp_vlc_bits[ce] = get_bits(gb, 5) + 1;
311  }
312  } else {
313  unsigned current_entry = 0;
314  unsigned current_length = get_bits(gb, 5) + 1;
315 
316  av_dlog(NULL, " ordered, current length: %u\n", current_length); //FIXME
317 
318  used_entries = entries;
319  for (; current_entry < used_entries && current_length <= 32; ++current_length) {
320  unsigned i, number;
321 
322  av_dlog(NULL, " number bits: %u ", ilog(entries - current_entry));
323 
324  number = get_bits(gb, ilog(entries - current_entry));
325 
326  av_dlog(NULL, " number: %u\n", number);
327 
328  for (i = current_entry; i < number+current_entry; ++i)
329  if (i < used_entries)
330  tmp_vlc_bits[i] = current_length;
331 
332  current_entry+=number;
333  }
334  if (current_entry>used_entries) {
335  av_log(vc->avccontext, AV_LOG_ERROR, " More codelengths than codes in codebook. \n");
336  ret = AVERROR_INVALIDDATA;
337  goto error;
338  }
339  }
340 
341  codebook_setup->lookup_type = get_bits(gb, 4);
342 
343  av_dlog(NULL, " lookup type: %d : %s \n", codebook_setup->lookup_type,
344  codebook_setup->lookup_type ? "vq" : "no lookup");
345 
346 // If the codebook is used for (inverse) VQ, calculate codevectors.
347 
348  if (codebook_setup->lookup_type == 1) {
349  unsigned i, j, k;
350  unsigned codebook_lookup_values = ff_vorbis_nth_root(entries, codebook_setup->dimensions);
351 
352  float codebook_minimum_value = vorbisfloat2float(get_bits_long(gb, 32));
353  float codebook_delta_value = vorbisfloat2float(get_bits_long(gb, 32));
354  unsigned codebook_value_bits = get_bits(gb, 4) + 1;
355  unsigned codebook_sequence_p = get_bits1(gb);
356 
357  av_dlog(NULL, " We expect %d numbers for building the codevectors. \n",
358  codebook_lookup_values);
359  av_dlog(NULL, " delta %f minmum %f \n",
360  codebook_delta_value, codebook_minimum_value);
361 
362  for (i = 0; i < codebook_lookup_values; ++i) {
363  codebook_multiplicands[i] = get_bits(gb, codebook_value_bits);
364 
365  av_dlog(NULL, " multiplicands*delta+minmum : %e \n",
366  (float)codebook_multiplicands[i] * codebook_delta_value + codebook_minimum_value);
367  av_dlog(NULL, " multiplicand %u\n", codebook_multiplicands[i]);
368  }
369 
370 // Weed out unused vlcs and build codevector vector
371  codebook_setup->codevectors = used_entries ? av_mallocz(used_entries *
372  codebook_setup->dimensions *
373  sizeof(*codebook_setup->codevectors))
374  : NULL;
375  for (j = 0, i = 0; i < entries; ++i) {
376  unsigned dim = codebook_setup->dimensions;
377 
378  if (tmp_vlc_bits[i]) {
379  float last = 0.0;
380  unsigned lookup_offset = i;
381 
382  av_dlog(vc->avccontext, "Lookup offset %u ,", i);
383 
384  for (k = 0; k < dim; ++k) {
385  unsigned multiplicand_offset = lookup_offset % codebook_lookup_values;
386  codebook_setup->codevectors[j * dim + k] = codebook_multiplicands[multiplicand_offset] * codebook_delta_value + codebook_minimum_value + last;
387  if (codebook_sequence_p)
388  last = codebook_setup->codevectors[j * dim + k];
389  lookup_offset/=codebook_lookup_values;
390  }
391  tmp_vlc_bits[j] = tmp_vlc_bits[i];
392 
393  av_dlog(vc->avccontext, "real lookup offset %u, vector: ", j);
394  for (k = 0; k < dim; ++k)
395  av_dlog(vc->avccontext, " %f ",
396  codebook_setup->codevectors[j * dim + k]);
397  av_dlog(vc->avccontext, "\n");
398 
399  ++j;
400  }
401  }
402  if (j != used_entries) {
403  av_log(vc->avccontext, AV_LOG_ERROR, "Bug in codevector vector building code. \n");
404  ret = AVERROR_INVALIDDATA;
405  goto error;
406  }
407  entries = used_entries;
408  } else if (codebook_setup->lookup_type >= 2) {
409  av_log(vc->avccontext, AV_LOG_ERROR, "Codebook lookup type not supported. \n");
410  ret = AVERROR_INVALIDDATA;
411  goto error;
412  }
413 
414 // Initialize VLC table
415  if (ff_vorbis_len2vlc(tmp_vlc_bits, tmp_vlc_codes, entries)) {
416  av_log(vc->avccontext, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");
417  ret = AVERROR_INVALIDDATA;
418  goto error;
419  }
420  codebook_setup->maxdepth = 0;
421  for (t = 0; t < entries; ++t)
422  if (tmp_vlc_bits[t] >= codebook_setup->maxdepth)
423  codebook_setup->maxdepth = tmp_vlc_bits[t];
424 
425  if (codebook_setup->maxdepth > 3 * V_NB_BITS)
426  codebook_setup->nb_bits = V_NB_BITS2;
427  else
428  codebook_setup->nb_bits = V_NB_BITS;
429 
430  codebook_setup->maxdepth = (codebook_setup->maxdepth+codebook_setup->nb_bits - 1) / codebook_setup->nb_bits;
431 
432  if ((ret = init_vlc(&codebook_setup->vlc, codebook_setup->nb_bits,
433  entries, tmp_vlc_bits, sizeof(*tmp_vlc_bits),
434  sizeof(*tmp_vlc_bits), tmp_vlc_codes,
435  sizeof(*tmp_vlc_codes), sizeof(*tmp_vlc_codes),
436  INIT_VLC_LE))) {
437  av_log(vc->avccontext, AV_LOG_ERROR, " Error generating vlc tables. \n");
438  goto error;
439  }
440  }
441 
442  av_free(tmp_vlc_bits);
443  av_free(tmp_vlc_codes);
444  av_free(codebook_multiplicands);
445  return 0;
446 
447 // Error:
448 error:
449  av_free(tmp_vlc_bits);
450  av_free(tmp_vlc_codes);
451  av_free(codebook_multiplicands);
452  return ret;
453 }
454 
455 // Process time domain transforms part (unused in Vorbis I)
456 
458 {
459  GetBitContext *gb = &vc->gb;
460  unsigned i, vorbis_time_count = get_bits(gb, 6) + 1;
461 
462  for (i = 0; i < vorbis_time_count; ++i) {
463  unsigned vorbis_tdtransform = get_bits(gb, 16);
464 
465  av_dlog(NULL, " Vorbis time domain transform %u: %u\n",
466  vorbis_time_count, vorbis_tdtransform);
467 
468  if (vorbis_tdtransform) {
469  av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n");
470  return AVERROR_INVALIDDATA;
471  }
472  }
473  return 0;
474 }
475 
476 // Process floors part
477 
478 static int vorbis_floor0_decode(vorbis_context *vc,
479  vorbis_floor_data *vfu, float *vec);
480 static void create_map(vorbis_context *vc, unsigned floor_number);
481 static int vorbis_floor1_decode(vorbis_context *vc,
482  vorbis_floor_data *vfu, float *vec);
484 {
485  GetBitContext *gb = &vc->gb;
486  int i,j,k;
487 
488  vc->floor_count = get_bits(gb, 6) + 1;
489 
490  vc->floors = av_mallocz(vc->floor_count * sizeof(*vc->floors));
491 
492  for (i = 0; i < vc->floor_count; ++i) {
493  vorbis_floor *floor_setup = &vc->floors[i];
494 
495  floor_setup->floor_type = get_bits(gb, 16);
496 
497  av_dlog(NULL, " %d. floor type %d \n", i, floor_setup->floor_type);
498 
499  if (floor_setup->floor_type == 1) {
500  int maximum_class = -1;
501  unsigned rangebits, rangemax, floor1_values = 2;
502 
503  floor_setup->decode = vorbis_floor1_decode;
504 
505  floor_setup->data.t1.partitions = get_bits(gb, 5);
506 
507  av_dlog(NULL, " %d.floor: %d partitions \n",
508  i, floor_setup->data.t1.partitions);
509 
510  for (j = 0; j < floor_setup->data.t1.partitions; ++j) {
511  floor_setup->data.t1.partition_class[j] = get_bits(gb, 4);
512  if (floor_setup->data.t1.partition_class[j] > maximum_class)
513  maximum_class = floor_setup->data.t1.partition_class[j];
514 
515  av_dlog(NULL, " %d. floor %d partition class %d \n",
516  i, j, floor_setup->data.t1.partition_class[j]);
517 
518  }
519 
520  av_dlog(NULL, " maximum class %d \n", maximum_class);
521 
522  for (j = 0; j <= maximum_class; ++j) {
523  floor_setup->data.t1.class_dimensions[j] = get_bits(gb, 3) + 1;
524  floor_setup->data.t1.class_subclasses[j] = get_bits(gb, 2);
525 
526  av_dlog(NULL, " %d floor %d class dim: %d subclasses %d \n", i, j,
527  floor_setup->data.t1.class_dimensions[j],
528  floor_setup->data.t1.class_subclasses[j]);
529 
530  if (floor_setup->data.t1.class_subclasses[j]) {
532 
533  av_dlog(NULL, " masterbook: %d \n", floor_setup->data.t1.class_masterbook[j]);
534  }
535 
536  for (k = 0; k < (1 << floor_setup->data.t1.class_subclasses[j]); ++k) {
537  int16_t bits = get_bits(gb, 8) - 1;
538  if (bits != -1)
539  VALIDATE_INDEX(bits, vc->codebook_count)
540  floor_setup->data.t1.subclass_books[j][k] = bits;
541 
542  av_dlog(NULL, " book %d. : %d \n", k, floor_setup->data.t1.subclass_books[j][k]);
543  }
544  }
545 
546  floor_setup->data.t1.multiplier = get_bits(gb, 2) + 1;
547  floor_setup->data.t1.x_list_dim = 2;
548 
549  for (j = 0; j < floor_setup->data.t1.partitions; ++j)
550  floor_setup->data.t1.x_list_dim+=floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];
551 
552  floor_setup->data.t1.list = av_mallocz(floor_setup->data.t1.x_list_dim *
553  sizeof(*floor_setup->data.t1.list));
554 
555 
556  rangebits = get_bits(gb, 4);
557  rangemax = (1 << rangebits);
558  if (rangemax > vc->blocksize[1] / 2) {
560  "Floor value is too large for blocksize: %u (%"PRIu32")\n",
561  rangemax, vc->blocksize[1] / 2);
562  return AVERROR_INVALIDDATA;
563  }
564  floor_setup->data.t1.list[0].x = 0;
565  floor_setup->data.t1.list[1].x = rangemax;
566 
567  for (j = 0; j < floor_setup->data.t1.partitions; ++j) {
568  for (k = 0; k < floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]]; ++k, ++floor1_values) {
569  floor_setup->data.t1.list[floor1_values].x = get_bits(gb, rangebits);
570 
571  av_dlog(NULL, " %u. floor1 Y coord. %d\n", floor1_values,
572  floor_setup->data.t1.list[floor1_values].x);
573  }
574  }
575 
576 // Precalculate order of x coordinates - needed for decode
577  ff_vorbis_ready_floor1_list(floor_setup->data.t1.list, floor_setup->data.t1.x_list_dim);
578  } else if (floor_setup->floor_type == 0) {
579  unsigned max_codebook_dim = 0;
580 
581  floor_setup->decode = vorbis_floor0_decode;
582 
583  floor_setup->data.t0.order = get_bits(gb, 8);
584  floor_setup->data.t0.rate = get_bits(gb, 16);
585  floor_setup->data.t0.bark_map_size = get_bits(gb, 16);
586  floor_setup->data.t0.amplitude_bits = get_bits(gb, 6);
587  /* zero would result in a div by zero later *
588  * 2^0 - 1 == 0 */
589  if (floor_setup->data.t0.amplitude_bits == 0) {
591  "Floor 0 amplitude bits is 0.\n");
592  return AVERROR_INVALIDDATA;
593  }
594  floor_setup->data.t0.amplitude_offset = get_bits(gb, 8);
595  floor_setup->data.t0.num_books = get_bits(gb, 4) + 1;
596 
597  /* allocate mem for booklist */
598  floor_setup->data.t0.book_list =
599  av_malloc(floor_setup->data.t0.num_books);
600  if (!floor_setup->data.t0.book_list)
601  return AVERROR(ENOMEM);
602  /* read book indexes */
603  {
604  int idx;
605  unsigned book_idx;
606  for (idx = 0; idx < floor_setup->data.t0.num_books; ++idx) {
607  GET_VALIDATED_INDEX(book_idx, 8, vc->codebook_count)
608  floor_setup->data.t0.book_list[idx] = book_idx;
609  if (vc->codebooks[book_idx].dimensions > max_codebook_dim)
610  max_codebook_dim = vc->codebooks[book_idx].dimensions;
611  }
612  }
613 
614  create_map(vc, i);
615 
616  /* codebook dim is for padding if codebook dim doesn't *
617  * divide order+1 then we need to read more data */
618  floor_setup->data.t0.lsp =
619  av_malloc((floor_setup->data.t0.order + 1 + max_codebook_dim)
620  * sizeof(*floor_setup->data.t0.lsp));
621  if (!floor_setup->data.t0.lsp)
622  return AVERROR(ENOMEM);
623 
624  /* debug output parsed headers */
625  av_dlog(NULL, "floor0 order: %u\n", floor_setup->data.t0.order);
626  av_dlog(NULL, "floor0 rate: %u\n", floor_setup->data.t0.rate);
627  av_dlog(NULL, "floor0 bark map size: %u\n",
628  floor_setup->data.t0.bark_map_size);
629  av_dlog(NULL, "floor0 amplitude bits: %u\n",
630  floor_setup->data.t0.amplitude_bits);
631  av_dlog(NULL, "floor0 amplitude offset: %u\n",
632  floor_setup->data.t0.amplitude_offset);
633  av_dlog(NULL, "floor0 number of books: %u\n",
634  floor_setup->data.t0.num_books);
635  av_dlog(NULL, "floor0 book list pointer: %p\n",
636  floor_setup->data.t0.book_list);
637  {
638  int idx;
639  for (idx = 0; idx < floor_setup->data.t0.num_books; ++idx) {
640  av_dlog(NULL, " Book %d: %u\n", idx + 1,
641  floor_setup->data.t0.book_list[idx]);
642  }
643  }
644  } else {
645  av_log(vc->avccontext, AV_LOG_ERROR, "Invalid floor type!\n");
646  return AVERROR_INVALIDDATA;
647  }
648  }
649  return 0;
650 }
651 
652 // Process residues part
653 
655 {
656  GetBitContext *gb = &vc->gb;
657  unsigned i, j, k;
658 
659  vc->residue_count = get_bits(gb, 6)+1;
660  vc->residues = av_mallocz(vc->residue_count * sizeof(*vc->residues));
661 
662  av_dlog(NULL, " There are %d residues. \n", vc->residue_count);
663 
664  for (i = 0; i < vc->residue_count; ++i) {
665  vorbis_residue *res_setup = &vc->residues[i];
666  uint8_t cascade[64];
667  unsigned high_bits, low_bits;
668 
669  res_setup->type = get_bits(gb, 16);
670 
671  av_dlog(NULL, " %u. residue type %d\n", i, res_setup->type);
672 
673  res_setup->begin = get_bits(gb, 24);
674  res_setup->end = get_bits(gb, 24);
675  res_setup->partition_size = get_bits(gb, 24) + 1;
676  /* Validations to prevent a buffer overflow later. */
677  if (res_setup->begin>res_setup->end ||
678  res_setup->end > (res_setup->type == 2 ? vc->avccontext->channels : 1) * vc->blocksize[1] / 2 ||
679  (res_setup->end-res_setup->begin) / res_setup->partition_size > V_MAX_PARTITIONS) {
681  "partition out of bounds: type, begin, end, size, blocksize: %"PRIu16", %"PRIu32", %"PRIu32", %u, %"PRIu32"\n",
682  res_setup->type, res_setup->begin, res_setup->end,
683  res_setup->partition_size, vc->blocksize[1] / 2);
684  return AVERROR_INVALIDDATA;
685  }
686 
687  res_setup->classifications = get_bits(gb, 6) + 1;
688  GET_VALIDATED_INDEX(res_setup->classbook, 8, vc->codebook_count)
689 
690  res_setup->ptns_to_read =
691  (res_setup->end - res_setup->begin) / res_setup->partition_size;
692  res_setup->classifs = av_malloc(res_setup->ptns_to_read *
693  vc->audio_channels *
694  sizeof(*res_setup->classifs));
695  if (!res_setup->classifs)
696  return AVERROR(ENOMEM);
697 
698  av_dlog(NULL, " begin %d end %d part.size %d classif.s %d classbook %d \n",
699  res_setup->begin, res_setup->end, res_setup->partition_size,
700  res_setup->classifications, res_setup->classbook);
701 
702  for (j = 0; j < res_setup->classifications; ++j) {
703  high_bits = 0;
704  low_bits = get_bits(gb, 3);
705  if (get_bits1(gb))
706  high_bits = get_bits(gb, 5);
707  cascade[j] = (high_bits << 3) + low_bits;
708 
709  av_dlog(NULL, " %u class cascade depth: %d\n", j, ilog(cascade[j]));
710  }
711 
712  res_setup->maxpass = 0;
713  for (j = 0; j < res_setup->classifications; ++j) {
714  for (k = 0; k < 8; ++k) {
715  if (cascade[j]&(1 << k)) {
716  GET_VALIDATED_INDEX(res_setup->books[j][k], 8, vc->codebook_count)
717 
718  av_dlog(NULL, " %u class cascade depth %u book: %d\n",
719  j, k, res_setup->books[j][k]);
720 
721  if (k>res_setup->maxpass)
722  res_setup->maxpass = k;
723  } else {
724  res_setup->books[j][k] = -1;
725  }
726  }
727  }
728  }
729  return 0;
730 }
731 
732 // Process mappings part
733 
735 {
736  GetBitContext *gb = &vc->gb;
737  unsigned i, j;
738 
739  vc->mapping_count = get_bits(gb, 6)+1;
740  vc->mappings = av_mallocz(vc->mapping_count * sizeof(*vc->mappings));
741 
742  av_dlog(NULL, " There are %d mappings. \n", vc->mapping_count);
743 
744  for (i = 0; i < vc->mapping_count; ++i) {
745  vorbis_mapping *mapping_setup = &vc->mappings[i];
746 
747  if (get_bits(gb, 16)) {
748  av_log(vc->avccontext, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n");
749  return AVERROR_INVALIDDATA;
750  }
751  if (get_bits1(gb)) {
752  mapping_setup->submaps = get_bits(gb, 4) + 1;
753  } else {
754  mapping_setup->submaps = 1;
755  }
756 
757  if (get_bits1(gb)) {
758  mapping_setup->coupling_steps = get_bits(gb, 8) + 1;
759  mapping_setup->magnitude = av_mallocz(mapping_setup->coupling_steps *
760  sizeof(*mapping_setup->magnitude));
761  mapping_setup->angle = av_mallocz(mapping_setup->coupling_steps *
762  sizeof(*mapping_setup->angle));
763  for (j = 0; j < mapping_setup->coupling_steps; ++j) {
764  GET_VALIDATED_INDEX(mapping_setup->magnitude[j], ilog(vc->audio_channels - 1), vc->audio_channels)
765  GET_VALIDATED_INDEX(mapping_setup->angle[j], ilog(vc->audio_channels - 1), vc->audio_channels)
766  }
767  } else {
768  mapping_setup->coupling_steps = 0;
769  }
770 
771  av_dlog(NULL, " %u mapping coupling steps: %d\n",
772  i, mapping_setup->coupling_steps);
773 
774  if (get_bits(gb, 2)) {
775  av_log(vc->avccontext, AV_LOG_ERROR, "%u. mapping setup data invalid.\n", i);
776  return AVERROR_INVALIDDATA; // following spec.
777  }
778 
779  if (mapping_setup->submaps>1) {
780  mapping_setup->mux = av_mallocz(vc->audio_channels *
781  sizeof(*mapping_setup->mux));
782  for (j = 0; j < vc->audio_channels; ++j)
783  mapping_setup->mux[j] = get_bits(gb, 4);
784  }
785 
786  for (j = 0; j < mapping_setup->submaps; ++j) {
787  skip_bits(gb, 8); // FIXME check?
788  GET_VALIDATED_INDEX(mapping_setup->submap_floor[j], 8, vc->floor_count)
789  GET_VALIDATED_INDEX(mapping_setup->submap_residue[j], 8, vc->residue_count)
790 
791  av_dlog(NULL, " %u mapping %u submap : floor %d, residue %d\n", i, j,
792  mapping_setup->submap_floor[j],
793  mapping_setup->submap_residue[j]);
794  }
795  }
796  return 0;
797 }
798 
799 // Process modes part
800 
801 static void create_map(vorbis_context *vc, unsigned floor_number)
802 {
803  vorbis_floor *floors = vc->floors;
804  vorbis_floor0 *vf;
805  int idx;
806  int blockflag, n;
807  int32_t *map;
808 
809  for (blockflag = 0; blockflag < 2; ++blockflag) {
810  n = vc->blocksize[blockflag] / 2;
811  floors[floor_number].data.t0.map[blockflag] =
812  av_malloc((n + 1) * sizeof(int32_t)); // n + sentinel
813 
814  map = floors[floor_number].data.t0.map[blockflag];
815  vf = &floors[floor_number].data.t0;
816 
817  for (idx = 0; idx < n; ++idx) {
818  map[idx] = floor(BARK((vf->rate * idx) / (2.0f * n)) *
819  (vf->bark_map_size / BARK(vf->rate / 2.0f)));
820  if (vf->bark_map_size-1 < map[idx])
821  map[idx] = vf->bark_map_size - 1;
822  }
823  map[n] = -1;
824  vf->map_size[blockflag] = n;
825  }
826 
827  for (idx = 0; idx <= n; ++idx) {
828  av_dlog(NULL, "floor0 map: map at pos %d is %d\n", idx, map[idx]);
829  }
830 }
831 
833 {
834  GetBitContext *gb = &vc->gb;
835  unsigned i;
836 
837  vc->mode_count = get_bits(gb, 6) + 1;
838  vc->modes = av_mallocz(vc->mode_count * sizeof(*vc->modes));
839 
840  av_dlog(NULL, " There are %d modes.\n", vc->mode_count);
841 
842  for (i = 0; i < vc->mode_count; ++i) {
843  vorbis_mode *mode_setup = &vc->modes[i];
844 
845  mode_setup->blockflag = get_bits1(gb);
846  mode_setup->windowtype = get_bits(gb, 16); //FIXME check
847  mode_setup->transformtype = get_bits(gb, 16); //FIXME check
848  GET_VALIDATED_INDEX(mode_setup->mapping, 8, vc->mapping_count);
849 
850  av_dlog(NULL, " %u mode: blockflag %d, windowtype %d, transformtype %d, mapping %d\n",
851  i, mode_setup->blockflag, mode_setup->windowtype,
852  mode_setup->transformtype, mode_setup->mapping);
853  }
854  return 0;
855 }
856 
857 // Process the whole setup header using the functions above
858 
860 {
861  GetBitContext *gb = &vc->gb;
862  int ret;
863 
864  if ((get_bits(gb, 8) != 'v') || (get_bits(gb, 8) != 'o') ||
865  (get_bits(gb, 8) != 'r') || (get_bits(gb, 8) != 'b') ||
866  (get_bits(gb, 8) != 'i') || (get_bits(gb, 8) != 's')) {
867  av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n");
868  return AVERROR_INVALIDDATA;
869  }
870 
871  if ((ret = vorbis_parse_setup_hdr_codebooks(vc))) {
872  av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n");
873  return ret;
874  }
875  if ((ret = vorbis_parse_setup_hdr_tdtransforms(vc))) {
876  av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n");
877  return ret;
878  }
879  if ((ret = vorbis_parse_setup_hdr_floors(vc))) {
880  av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n");
881  return ret;
882  }
883  if ((ret = vorbis_parse_setup_hdr_residues(vc))) {
884  av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n");
885  return ret;
886  }
887  if ((ret = vorbis_parse_setup_hdr_mappings(vc))) {
888  av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n");
889  return ret;
890  }
891  if ((ret = vorbis_parse_setup_hdr_modes(vc))) {
892  av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n");
893  return ret;
894  }
895  if (!get_bits1(gb)) {
896  av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n");
897  return AVERROR_INVALIDDATA; // framing flag bit unset error
898  }
899 
900  return 0;
901 }
902 
903 // Process the identification header
904 
906 {
907  GetBitContext *gb = &vc->gb;
908  unsigned bl0, bl1;
909 
910  if ((get_bits(gb, 8) != 'v') || (get_bits(gb, 8) != 'o') ||
911  (get_bits(gb, 8) != 'r') || (get_bits(gb, 8) != 'b') ||
912  (get_bits(gb, 8) != 'i') || (get_bits(gb, 8) != 's')) {
913  av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n");
914  return AVERROR_INVALIDDATA;
915  }
916 
917  vc->version = get_bits_long(gb, 32); //FIXME check 0
918  vc->audio_channels = get_bits(gb, 8);
919  if (vc->audio_channels <= 0) {
920  av_log(vc->avccontext, AV_LOG_ERROR, "Invalid number of channels\n");
921  return AVERROR_INVALIDDATA;
922  }
923  vc->audio_samplerate = get_bits_long(gb, 32);
924  if (vc->audio_samplerate <= 0) {
925  av_log(vc->avccontext, AV_LOG_ERROR, "Invalid samplerate\n");
926  return AVERROR_INVALIDDATA;
927  }
928  vc->bitrate_maximum = get_bits_long(gb, 32);
929  vc->bitrate_nominal = get_bits_long(gb, 32);
930  vc->bitrate_minimum = get_bits_long(gb, 32);
931  bl0 = get_bits(gb, 4);
932  bl1 = get_bits(gb, 4);
933  vc->blocksize[0] = (1 << bl0);
934  vc->blocksize[1] = (1 << bl1);
935  if (bl0 > 13 || bl0 < 6 || bl1 > 13 || bl1 < 6 || bl1 < bl0) {
936  av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n");
937  return AVERROR_INVALIDDATA;
938  }
939  vc->win[0] = ff_vorbis_vwin[bl0 - 6];
940  vc->win[1] = ff_vorbis_vwin[bl1 - 6];
941 
942  if ((get_bits1(gb)) == 0) {
943  av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n");
944  return AVERROR_INVALIDDATA;
945  }
946 
947  vc->channel_residues = av_malloc((vc->blocksize[1] / 2) * vc->audio_channels * sizeof(*vc->channel_residues));
948  vc->channel_floors = av_malloc((vc->blocksize[1] / 2) * vc->audio_channels * sizeof(*vc->channel_floors));
949  vc->saved = av_mallocz((vc->blocksize[1] / 4) * vc->audio_channels * sizeof(*vc->saved));
950  vc->previous_window = 0;
951 
952  ff_mdct_init(&vc->mdct[0], bl0, 1, -vc->scale_bias);
953  ff_mdct_init(&vc->mdct[1], bl1, 1, -vc->scale_bias);
954 
955  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 ",
957 
958 /*
959  BLK = vc->blocksize[0];
960  for (i = 0; i < BLK / 2; ++i) {
961  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)));
962  }
963 */
964 
965  return 0;
966 }
967 
968 // Process the extradata using the functions above (identification header, setup header)
969 
971 {
972  vorbis_context *vc = avccontext->priv_data;
973  uint8_t *headers = avccontext->extradata;
974  int headers_len = avccontext->extradata_size;
975  uint8_t *header_start[3];
976  int header_len[3];
977  GetBitContext *gb = &vc->gb;
978  int hdr_type, ret;
979 
980  vc->avccontext = avccontext;
981  dsputil_init(&vc->dsp, avccontext);
982  ff_fmt_convert_init(&vc->fmt_conv, avccontext);
983 
984  if (avccontext->request_sample_fmt == AV_SAMPLE_FMT_FLT) {
985  avccontext->sample_fmt = AV_SAMPLE_FMT_FLT;
986  vc->scale_bias = 1.0f;
987  } else {
988  avccontext->sample_fmt = AV_SAMPLE_FMT_S16;
989  vc->scale_bias = 32768.0f;
990  }
991 
992  if (!headers_len) {
993  av_log(avccontext, AV_LOG_ERROR, "Extradata missing.\n");
994  return AVERROR_INVALIDDATA;
995  }
996 
997  if ((ret = avpriv_split_xiph_headers(headers, headers_len, 30, header_start, header_len)) < 0) {
998  av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
999  return ret;
1000  }
1001 
1002  init_get_bits(gb, header_start[0], header_len[0]*8);
1003  hdr_type = get_bits(gb, 8);
1004  if (hdr_type != 1) {
1005  av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n");
1006  return AVERROR_INVALIDDATA;
1007  }
1008  if ((ret = vorbis_parse_id_hdr(vc))) {
1009  av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n");
1010  vorbis_free(vc);
1011  return ret;
1012  }
1013 
1014  init_get_bits(gb, header_start[2], header_len[2]*8);
1015  hdr_type = get_bits(gb, 8);
1016  if (hdr_type != 5) {
1017  av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");
1018  vorbis_free(vc);
1019  return AVERROR_INVALIDDATA;
1020  }
1021  if ((ret = vorbis_parse_setup_hdr(vc))) {
1022  av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");
1023  vorbis_free(vc);
1024  return ret;
1025  }
1026 
1027  if (vc->audio_channels > 8)
1028  avccontext->channel_layout = 0;
1029  else
1031 
1032  avccontext->channels = vc->audio_channels;
1033  avccontext->sample_rate = vc->audio_samplerate;
1034  avccontext->frame_size = FFMIN(vc->blocksize[0], vc->blocksize[1]) >> 2;
1035 
1037  avccontext->coded_frame = &vc->frame;
1038 
1039  return 0;
1040 }
1041 
1042 // Decode audiopackets -------------------------------------------------
1043 
1044 // Read and decode floor
1045 
1047  vorbis_floor_data *vfu, float *vec)
1048 {
1049  vorbis_floor0 *vf = &vfu->t0;
1050  float *lsp = vf->lsp;
1051  unsigned amplitude, book_idx;
1052  unsigned blockflag = vc->modes[vc->mode_number].blockflag;
1053 
1054  amplitude = get_bits(&vc->gb, vf->amplitude_bits);
1055  if (amplitude > 0) {
1056  float last = 0;
1057  unsigned idx, lsp_len = 0;
1058  vorbis_codebook codebook;
1059 
1060  book_idx = get_bits(&vc->gb, ilog(vf->num_books));
1061  if (book_idx >= vf->num_books) {
1063  "floor0 dec: booknumber too high!\n");
1064  book_idx = 0;
1065  }
1066  av_dlog(NULL, "floor0 dec: booknumber: %u\n", book_idx);
1067  codebook = vc->codebooks[vf->book_list[book_idx]];
1068  /* Invalid codebook! */
1069  if (!codebook.codevectors)
1070  return AVERROR_INVALIDDATA;
1071 
1072  while (lsp_len<vf->order) {
1073  int vec_off;
1074 
1075  av_dlog(NULL, "floor0 dec: book dimension: %d\n", codebook.dimensions);
1076  av_dlog(NULL, "floor0 dec: maximum depth: %d\n", codebook.maxdepth);
1077  /* read temp vector */
1078  vec_off = get_vlc2(&vc->gb, codebook.vlc.table,
1079  codebook.nb_bits, codebook.maxdepth)
1080  * codebook.dimensions;
1081  av_dlog(NULL, "floor0 dec: vector offset: %d\n", vec_off);
1082  /* copy each vector component and add last to it */
1083  for (idx = 0; idx < codebook.dimensions; ++idx)
1084  lsp[lsp_len+idx] = codebook.codevectors[vec_off+idx] + last;
1085  last = lsp[lsp_len+idx-1]; /* set last to last vector component */
1086 
1087  lsp_len += codebook.dimensions;
1088  }
1089  /* DEBUG: output lsp coeffs */
1090  {
1091  int idx;
1092  for (idx = 0; idx < lsp_len; ++idx)
1093  av_dlog(NULL, "floor0 dec: coeff at %d is %f\n", idx, lsp[idx]);
1094  }
1095 
1096  /* synthesize floor output vector */
1097  {
1098  int i;
1099  int order = vf->order;
1100  float wstep = M_PI / vf->bark_map_size;
1101 
1102  for (i = 0; i < order; i++)
1103  lsp[i] = 2.0f * cos(lsp[i]);
1104 
1105  av_dlog(NULL, "floor0 synth: map_size = %"PRIu32"; m = %d; wstep = %f\n",
1106  vf->map_size[blockflag], order, wstep);
1107 
1108  i = 0;
1109  while (i < vf->map_size[blockflag]) {
1110  int j, iter_cond = vf->map[blockflag][i];
1111  float p = 0.5f;
1112  float q = 0.5f;
1113  float two_cos_w = 2.0f * cos(wstep * iter_cond); // needed all times
1114 
1115  /* similar part for the q and p products */
1116  for (j = 0; j + 1 < order; j += 2) {
1117  q *= lsp[j] - two_cos_w;
1118  p *= lsp[j + 1] - two_cos_w;
1119  }
1120  if (j == order) { // even order
1121  p *= p * (2.0f - two_cos_w);
1122  q *= q * (2.0f + two_cos_w);
1123  } else { // odd order
1124  q *= two_cos_w-lsp[j]; // one more time for q
1125 
1126  /* final step and square */
1127  p *= p * (4.f - two_cos_w * two_cos_w);
1128  q *= q;
1129  }
1130 
1131  /* calculate linear floor value */
1132  q = exp((((amplitude*vf->amplitude_offset) /
1133  (((1 << vf->amplitude_bits) - 1) * sqrt(p + q)))
1134  - vf->amplitude_offset) * .11512925f);
1135 
1136  /* fill vector */
1137  do {
1138  vec[i] = q; ++i;
1139  } while (vf->map[blockflag][i] == iter_cond);
1140  }
1141  }
1142  } else {
1143  /* this channel is unused */
1144  return 1;
1145  }
1146 
1147  av_dlog(NULL, " Floor0 decoded\n");
1148 
1149  return 0;
1150 }
1151 
1153  vorbis_floor_data *vfu, float *vec)
1154 {
1155  vorbis_floor1 *vf = &vfu->t1;
1156  GetBitContext *gb = &vc->gb;
1157  uint16_t range_v[4] = { 256, 128, 86, 64 };
1158  unsigned range = range_v[vf->multiplier - 1];
1159  uint16_t floor1_Y[258];
1160  uint16_t floor1_Y_final[258];
1161  int floor1_flag[258];
1162  unsigned class, cdim, cbits, csub, cval, offset, i, j;
1163  int book, adx, ady, dy, off, predicted, err;
1164 
1165 
1166  if (!get_bits1(gb)) // silence
1167  return 1;
1168 
1169 // Read values (or differences) for the floor's points
1170 
1171  floor1_Y[0] = get_bits(gb, ilog(range - 1));
1172  floor1_Y[1] = get_bits(gb, ilog(range - 1));
1173 
1174  av_dlog(NULL, "floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);
1175 
1176  offset = 2;
1177  for (i = 0; i < vf->partitions; ++i) {
1178  class = vf->partition_class[i];
1179  cdim = vf->class_dimensions[class];
1180  cbits = vf->class_subclasses[class];
1181  csub = (1 << cbits) - 1;
1182  cval = 0;
1183 
1184  av_dlog(NULL, "Cbits %u\n", cbits);
1185 
1186  if (cbits) // this reads all subclasses for this partition's class
1187  cval = get_vlc2(gb, vc->codebooks[vf->class_masterbook[class]].vlc.table,
1188  vc->codebooks[vf->class_masterbook[class]].nb_bits, 3);
1189 
1190  for (j = 0; j < cdim; ++j) {
1191  book = vf->subclass_books[class][cval & csub];
1192 
1193  av_dlog(NULL, "book %d Cbits %u cval %u bits:%d\n",
1194  book, cbits, cval, get_bits_count(gb));
1195 
1196  cval = cval >> cbits;
1197  if (book > -1) {
1198  floor1_Y[offset+j] = get_vlc2(gb, vc->codebooks[book].vlc.table,
1199  vc->codebooks[book].nb_bits, 3);
1200  } else {
1201  floor1_Y[offset+j] = 0;
1202  }
1203 
1204  av_dlog(NULL, " floor(%d) = %d \n",
1205  vf->list[offset+j].x, floor1_Y[offset+j]);
1206  }
1207  offset+=cdim;
1208  }
1209 
1210 // Amplitude calculation from the differences
1211 
1212  floor1_flag[0] = 1;
1213  floor1_flag[1] = 1;
1214  floor1_Y_final[0] = floor1_Y[0];
1215  floor1_Y_final[1] = floor1_Y[1];
1216 
1217  for (i = 2; i < vf->x_list_dim; ++i) {
1218  unsigned val, highroom, lowroom, room, high_neigh_offs, low_neigh_offs;
1219 
1220  low_neigh_offs = vf->list[i].low;
1221  high_neigh_offs = vf->list[i].high;
1222  dy = floor1_Y_final[high_neigh_offs] - floor1_Y_final[low_neigh_offs]; // render_point begin
1223  adx = vf->list[high_neigh_offs].x - vf->list[low_neigh_offs].x;
1224  ady = FFABS(dy);
1225  err = ady * (vf->list[i].x - vf->list[low_neigh_offs].x);
1226  off = err / adx;
1227  if (dy < 0) {
1228  predicted = floor1_Y_final[low_neigh_offs] - off;
1229  } else {
1230  predicted = floor1_Y_final[low_neigh_offs] + off;
1231  } // render_point end
1232 
1233  val = floor1_Y[i];
1234  highroom = range-predicted;
1235  lowroom = predicted;
1236  if (highroom < lowroom) {
1237  room = highroom * 2;
1238  } else {
1239  room = lowroom * 2; // SPEC mispelling
1240  }
1241  if (val) {
1242  floor1_flag[low_neigh_offs] = 1;
1243  floor1_flag[high_neigh_offs] = 1;
1244  floor1_flag[i] = 1;
1245  if (val >= room) {
1246  if (highroom > lowroom) {
1247  floor1_Y_final[i] = av_clip_uint16(val - lowroom + predicted);
1248  } else {
1249  floor1_Y_final[i] = av_clip_uint16(predicted - val + highroom - 1);
1250  }
1251  } else {
1252  if (val & 1) {
1253  floor1_Y_final[i] = av_clip_uint16(predicted - (val + 1) / 2);
1254  } else {
1255  floor1_Y_final[i] = av_clip_uint16(predicted + val / 2);
1256  }
1257  }
1258  } else {
1259  floor1_flag[i] = 0;
1260  floor1_Y_final[i] = av_clip_uint16(predicted);
1261  }
1262 
1263  av_dlog(NULL, " Decoded floor(%d) = %u / val %u\n",
1264  vf->list[i].x, floor1_Y_final[i], val);
1265  }
1266 
1267 // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?
1268 
1269  ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);
1270 
1271  av_dlog(NULL, " Floor decoded\n");
1272 
1273  return 0;
1274 }
1275 
1276 // Read and decode residue
1277 
1279  vorbis_residue *vr,
1280  unsigned ch,
1281  uint8_t *do_not_decode,
1282  float *vec,
1283  unsigned vlen,
1284  unsigned ch_left,
1285  int vr_type)
1286 {
1287  GetBitContext *gb = &vc->gb;
1288  unsigned c_p_c = vc->codebooks[vr->classbook].dimensions;
1289  unsigned ptns_to_read = vr->ptns_to_read;
1290  uint8_t *classifs = vr->classifs;
1291  unsigned pass, ch_used, i, j, k, l;
1292  unsigned max_output = (ch - 1) * vlen;
1293 
1294  if (vr_type == 2) {
1295  for (j = 1; j < ch; ++j)
1296  do_not_decode[0] &= do_not_decode[j]; // FIXME - clobbering input
1297  if (do_not_decode[0])
1298  return 0;
1299  ch_used = 1;
1300  max_output += vr->end / ch;
1301  } else {
1302  ch_used = ch;
1303  max_output += vr->end;
1304  }
1305 
1306  if (max_output > ch_left * vlen) {
1307  av_log(vc->avccontext, AV_LOG_ERROR, "Insufficient output buffer\n");
1308  return -1;
1309  }
1310 
1311  av_dlog(NULL, " residue type 0/1/2 decode begin, ch: %d cpc %d \n", ch, c_p_c);
1312 
1313  for (pass = 0; pass <= vr->maxpass; ++pass) { // FIXME OPTIMIZE?
1314  uint16_t voffset, partition_count, j_times_ptns_to_read;
1315 
1316  voffset = vr->begin;
1317  for (partition_count = 0; partition_count < ptns_to_read;) { // SPEC error
1318  if (!pass) {
1319  unsigned inverse_class = ff_inverse[vr->classifications];
1320  for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {
1321  if (!do_not_decode[j]) {
1322  unsigned temp = get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,
1323  vc->codebooks[vr->classbook].nb_bits, 3);
1324 
1325  av_dlog(NULL, "Classword: %u\n", temp);
1326 
1327  assert(vr->classifications > 1 && temp <= 65536); //needed for inverse[]
1328  for (i = 0; i < c_p_c; ++i) {
1329  unsigned temp2;
1330 
1331  temp2 = (((uint64_t)temp) * inverse_class) >> 32;
1332  if (partition_count + c_p_c - 1 - i < ptns_to_read)
1333  classifs[j_times_ptns_to_read + partition_count + c_p_c - 1 - i] = temp - temp2 * vr->classifications;
1334  temp = temp2;
1335  }
1336  }
1337  j_times_ptns_to_read += ptns_to_read;
1338  }
1339  }
1340  for (i = 0; (i < c_p_c) && (partition_count < ptns_to_read); ++i) {
1341  for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {
1342  unsigned voffs;
1343 
1344  if (!do_not_decode[j]) {
1345  unsigned vqclass = classifs[j_times_ptns_to_read + partition_count];
1346  int vqbook = vr->books[vqclass][pass];
1347 
1348  if (vqbook >= 0 && vc->codebooks[vqbook].codevectors) {
1349  unsigned coffs;
1350  unsigned dim = vc->codebooks[vqbook].dimensions;
1351  unsigned step = dim == 1 ? vr->partition_size
1352  : FASTDIV(vr->partition_size, dim);
1353  vorbis_codebook codebook = vc->codebooks[vqbook];
1354 
1355  if (vr_type == 0) {
1356 
1357  voffs = voffset+j*vlen;
1358  for (k = 0; k < step; ++k) {
1359  coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1360  for (l = 0; l < dim; ++l)
1361  vec[voffs + k + l * step] += codebook.codevectors[coffs + l]; // FPMATH
1362  }
1363  } else if (vr_type == 1) {
1364  voffs = voffset + j * vlen;
1365  for (k = 0; k < step; ++k) {
1366  coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1367  for (l = 0; l < dim; ++l, ++voffs) {
1368  vec[voffs]+=codebook.codevectors[coffs+l]; // FPMATH
1369 
1370  av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d \n",
1371  pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);
1372  }
1373  }
1374  } else if (vr_type == 2 && ch == 2 && (voffset & 1) == 0 && (dim & 1) == 0) { // most frequent case optimized
1375  voffs = voffset >> 1;
1376 
1377  if (dim == 2) {
1378  for (k = 0; k < step; ++k) {
1379  coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;
1380  vec[voffs + k ] += codebook.codevectors[coffs ]; // FPMATH
1381  vec[voffs + k + vlen] += codebook.codevectors[coffs + 1]; // FPMATH
1382  }
1383  } else if (dim == 4) {
1384  for (k = 0; k < step; ++k, voffs += 2) {
1385  coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4;
1386  vec[voffs ] += codebook.codevectors[coffs ]; // FPMATH
1387  vec[voffs + 1 ] += codebook.codevectors[coffs + 2]; // FPMATH
1388  vec[voffs + vlen ] += codebook.codevectors[coffs + 1]; // FPMATH
1389  vec[voffs + vlen + 1] += codebook.codevectors[coffs + 3]; // FPMATH
1390  }
1391  } else
1392  for (k = 0; k < step; ++k) {
1393  coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1394  for (l = 0; l < dim; l += 2, voffs++) {
1395  vec[voffs ] += codebook.codevectors[coffs + l ]; // FPMATH
1396  vec[voffs + vlen] += codebook.codevectors[coffs + l + 1]; // FPMATH
1397 
1398  av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d+%d \n",
1399  pass, voffset / ch + (voffs % ch) * vlen,
1400  vec[voffset / ch + (voffs % ch) * vlen],
1401  codebook.codevectors[coffs + l], coffs, l);
1402  }
1403  }
1404 
1405  } else if (vr_type == 2) {
1406  voffs = voffset;
1407 
1408  for (k = 0; k < step; ++k) {
1409  coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1410  for (l = 0; l < dim; ++l, ++voffs) {
1411  vec[voffs / ch + (voffs % ch) * vlen] += codebook.codevectors[coffs + l]; // FPMATH FIXME use if and counter instead of / and %
1412 
1413  av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d+%d \n",
1414  pass, voffset / ch + (voffs % ch) * vlen,
1415  vec[voffset / ch + (voffs % ch) * vlen],
1416  codebook.codevectors[coffs + l], coffs, l);
1417  }
1418  }
1419  }
1420  }
1421  }
1422  j_times_ptns_to_read += ptns_to_read;
1423  }
1424  ++partition_count;
1425  voffset += vr->partition_size;
1426  }
1427  }
1428  }
1429  return 0;
1430 }
1431 
1433  unsigned ch,
1434  uint8_t *do_not_decode,
1435  float *vec, unsigned vlen,
1436  unsigned ch_left)
1437 {
1438  if (vr->type == 2)
1439  return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 2);
1440  else if (vr->type == 1)
1441  return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 1);
1442  else if (vr->type == 0)
1443  return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 0);
1444  else {
1445  av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");
1446  return AVERROR_INVALIDDATA;
1447  }
1448 }
1449 
1450 void vorbis_inverse_coupling(float *mag, float *ang, int blocksize)
1451 {
1452  int i;
1453  for (i = 0; i < blocksize; i++) {
1454  if (mag[i] > 0.0) {
1455  if (ang[i] > 0.0) {
1456  ang[i] = mag[i] - ang[i];
1457  } else {
1458  float temp = ang[i];
1459  ang[i] = mag[i];
1460  mag[i] += temp;
1461  }
1462  } else {
1463  if (ang[i] > 0.0) {
1464  ang[i] += mag[i];
1465  } else {
1466  float temp = ang[i];
1467  ang[i] = mag[i];
1468  mag[i] -= temp;
1469  }
1470  }
1471  }
1472 }
1473 
1474 // Decode the audio packet using the functions above
1475 
1477 {
1478  GetBitContext *gb = &vc->gb;
1479  FFTContext *mdct;
1480  unsigned previous_window = vc->previous_window;
1481  unsigned mode_number, blockflag, blocksize;
1482  int i, j;
1483  uint8_t no_residue[255];
1484  uint8_t do_not_decode[255];
1485  vorbis_mapping *mapping;
1486  float *ch_res_ptr = vc->channel_residues;
1487  float *ch_floor_ptr = vc->channel_floors;
1488  uint8_t res_chan[255];
1489  unsigned res_num = 0;
1490  int retlen = 0;
1491  unsigned ch_left = vc->audio_channels;
1492  unsigned vlen;
1493 
1494  if (get_bits1(gb)) {
1495  av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");
1496  return AVERROR_INVALIDDATA; // packet type not audio
1497  }
1498 
1499  if (vc->mode_count == 1) {
1500  mode_number = 0;
1501  } else {
1502  GET_VALIDATED_INDEX(mode_number, ilog(vc->mode_count-1), vc->mode_count)
1503  }
1504  vc->mode_number = mode_number;
1505  mapping = &vc->mappings[vc->modes[mode_number].mapping];
1506 
1507  av_dlog(NULL, " Mode number: %u , mapping: %d , blocktype %d\n", mode_number,
1508  vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);
1509 
1510  blockflag = vc->modes[mode_number].blockflag;
1511  blocksize = vc->blocksize[blockflag];
1512  vlen = blocksize / 2;
1513  if (blockflag)
1514  skip_bits(gb, 2); // previous_window, next_window
1515 
1516  memset(ch_res_ptr, 0, sizeof(float) * vc->audio_channels * vlen); //FIXME can this be removed ?
1517  memset(ch_floor_ptr, 0, sizeof(float) * vc->audio_channels * vlen); //FIXME can this be removed ?
1518 
1519 // Decode floor
1520 
1521  for (i = 0; i < vc->audio_channels; ++i) {
1522  vorbis_floor *floor;
1523  int ret;
1524  if (mapping->submaps > 1) {
1525  floor = &vc->floors[mapping->submap_floor[mapping->mux[i]]];
1526  } else {
1527  floor = &vc->floors[mapping->submap_floor[0]];
1528  }
1529 
1530  ret = floor->decode(vc, &floor->data, ch_floor_ptr);
1531 
1532  if (ret < 0) {
1533  av_log(vc->avccontext, AV_LOG_ERROR, "Invalid codebook in vorbis_floor_decode.\n");
1534  return AVERROR_INVALIDDATA;
1535  }
1536  no_residue[i] = ret;
1537  ch_floor_ptr += vlen;
1538  }
1539 
1540 // Nonzero vector propagate
1541 
1542  for (i = mapping->coupling_steps - 1; i >= 0; --i) {
1543  if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {
1544  no_residue[mapping->magnitude[i]] = 0;
1545  no_residue[mapping->angle[i]] = 0;
1546  }
1547  }
1548 
1549 // Decode residue
1550 
1551  for (i = 0; i < mapping->submaps; ++i) {
1552  vorbis_residue *residue;
1553  unsigned ch = 0;
1554  int ret;
1555 
1556  for (j = 0; j < vc->audio_channels; ++j) {
1557  if ((mapping->submaps == 1) || (i == mapping->mux[j])) {
1558  res_chan[j] = res_num;
1559  if (no_residue[j]) {
1560  do_not_decode[ch] = 1;
1561  } else {
1562  do_not_decode[ch] = 0;
1563  }
1564  ++ch;
1565  ++res_num;
1566  }
1567  }
1568  residue = &vc->residues[mapping->submap_residue[i]];
1569  if (ch_left < ch) {
1570  av_log(vc->avccontext, AV_LOG_ERROR, "Too many channels in vorbis_floor_decode.\n");
1571  return -1;
1572  }
1573  if (ch) {
1574  ret = vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, vlen, ch_left);
1575  if (ret < 0)
1576  return ret;
1577  }
1578 
1579  ch_res_ptr += ch * vlen;
1580  ch_left -= ch;
1581  }
1582 
1583 // Inverse coupling
1584 
1585  for (i = mapping->coupling_steps - 1; i >= 0; --i) { //warning: i has to be signed
1586  float *mag, *ang;
1587 
1588  mag = vc->channel_residues+res_chan[mapping->magnitude[i]] * blocksize / 2;
1589  ang = vc->channel_residues+res_chan[mapping->angle[i]] * blocksize / 2;
1590  vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize / 2);
1591  }
1592 
1593 // Dotproduct, MDCT
1594 
1595  mdct = &vc->mdct[blockflag];
1596 
1597  for (j = vc->audio_channels-1;j >= 0; j--) {
1598  ch_floor_ptr = vc->channel_floors + j * blocksize / 2;
1599  ch_res_ptr = vc->channel_residues + res_chan[j] * blocksize / 2;
1600  vc->dsp.vector_fmul(ch_floor_ptr, ch_floor_ptr, ch_res_ptr, blocksize / 2);
1601  mdct->imdct_half(mdct, ch_res_ptr, ch_floor_ptr);
1602  }
1603 
1604 // Overlap/add, save data for next overlapping FPMATH
1605 
1606  retlen = (blocksize + vc->blocksize[previous_window]) / 4;
1607  for (j = 0; j < vc->audio_channels; j++) {
1608  unsigned bs0 = vc->blocksize[0];
1609  unsigned bs1 = vc->blocksize[1];
1610  float *residue = vc->channel_residues + res_chan[j] * blocksize / 2;
1611  float *saved = vc->saved + j * bs1 / 4;
1612  float *ret = vc->channel_floors + j * retlen;
1613  float *buf = residue;
1614  const float *win = vc->win[blockflag & previous_window];
1615 
1616  if (blockflag == previous_window) {
1617  vc->dsp.vector_fmul_window(ret, saved, buf, win, blocksize / 4);
1618  } else if (blockflag > previous_window) {
1619  vc->dsp.vector_fmul_window(ret, saved, buf, win, bs0 / 4);
1620  memcpy(ret+bs0/2, buf+bs0/4, ((bs1-bs0)/4) * sizeof(float));
1621  } else {
1622  memcpy(ret, saved, ((bs1 - bs0) / 4) * sizeof(float));
1623  vc->dsp.vector_fmul_window(ret + (bs1 - bs0) / 4, saved + (bs1 - bs0) / 4, buf, win, bs0 / 4);
1624  }
1625  memcpy(saved, buf + blocksize / 4, blocksize / 4 * sizeof(float));
1626  }
1627 
1628  vc->previous_window = blockflag;
1629  return retlen;
1630 }
1631 
1632 // Return the decoded audio packet through the standard api
1633 
1634 static int vorbis_decode_frame(AVCodecContext *avccontext, void *data,
1635  int *got_frame_ptr, AVPacket *avpkt)
1636 {
1637  const uint8_t *buf = avpkt->data;
1638  int buf_size = avpkt->size;
1639  vorbis_context *vc = avccontext->priv_data;
1640  GetBitContext *gb = &vc->gb;
1641  const float *channel_ptrs[255];
1642  int i, len, ret;
1643 
1644  av_dlog(NULL, "packet length %d \n", buf_size);
1645 
1646  init_get_bits(gb, buf, buf_size*8);
1647 
1648  if ((len = vorbis_parse_audio_packet(vc)) <= 0)
1649  return len;
1650 
1651  if (!vc->first_frame) {
1652  vc->first_frame = 1;
1653  *got_frame_ptr = 0;
1654  return buf_size;
1655  }
1656 
1657  av_dlog(NULL, "parsed %d bytes %d bits, returned %d samples (*ch*bits) \n",
1658  get_bits_count(gb) / 8, get_bits_count(gb) % 8, len);
1659 
1660  /* get output buffer */
1661  vc->frame.nb_samples = len;
1662  if ((ret = avccontext->get_buffer(avccontext, &vc->frame)) < 0) {
1663  av_log(avccontext, AV_LOG_ERROR, "get_buffer() failed\n");
1664  return ret;
1665  }
1666 
1667  if (vc->audio_channels > 8) {
1668  for (i = 0; i < vc->audio_channels; i++)
1669  channel_ptrs[i] = vc->channel_floors + i * len;
1670  } else {
1671  for (i = 0; i < vc->audio_channels; i++)
1672  channel_ptrs[i] = vc->channel_floors +
1674  }
1675 
1676  if (avccontext->sample_fmt == AV_SAMPLE_FMT_FLT)
1677  vc->fmt_conv.float_interleave((float *)vc->frame.data[0], channel_ptrs,
1678  len, vc->audio_channels);
1679  else
1680  vc->fmt_conv.float_to_int16_interleave((int16_t *)vc->frame.data[0],
1681  channel_ptrs, len,
1682  vc->audio_channels);
1683 
1684  *got_frame_ptr = 1;
1685  *(AVFrame *)data = vc->frame;
1686 
1687  return buf_size;
1688 }
1689 
1690 // Close decoder
1691 
1693 {
1694  vorbis_context *vc = avccontext->priv_data;
1695 
1696  vorbis_free(vc);
1697 
1698  return 0;
1699 }
1700 
1702  .name = "vorbis",
1703  .type = AVMEDIA_TYPE_AUDIO,
1704  .id = CODEC_ID_VORBIS,
1705  .priv_data_size = sizeof(vorbis_context),
1709  .capabilities = CODEC_CAP_DR1,
1710  .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),
1711  .channel_layouts = ff_vorbis_channel_layouts,
1712  .sample_fmts = (const enum AVSampleFormat[]) {
1714  },
1715 };
1716