vorbisdec.c
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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  ff_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
578  floor_setup->data.t1.list,
579  floor_setup->data.t1.x_list_dim)) {
580  return AVERROR_INVALIDDATA;
581  }
582  } else if (floor_setup->floor_type == 0) {
583  unsigned max_codebook_dim = 0;
584 
585  floor_setup->decode = vorbis_floor0_decode;
586 
587  floor_setup->data.t0.order = get_bits(gb, 8);
588  floor_setup->data.t0.rate = get_bits(gb, 16);
589  floor_setup->data.t0.bark_map_size = get_bits(gb, 16);
590  if (floor_setup->data.t0.bark_map_size == 0) {
592  "Floor 0 bark map size is 0.\n");
593  return AVERROR_INVALIDDATA;
594  }
595  floor_setup->data.t0.amplitude_bits = get_bits(gb, 6);
596  /* zero would result in a div by zero later *
597  * 2^0 - 1 == 0 */
598  if (floor_setup->data.t0.amplitude_bits == 0) {
600  "Floor 0 amplitude bits is 0.\n");
601  return AVERROR_INVALIDDATA;
602  }
603  floor_setup->data.t0.amplitude_offset = get_bits(gb, 8);
604  floor_setup->data.t0.num_books = get_bits(gb, 4) + 1;
605 
606  /* allocate mem for booklist */
607  floor_setup->data.t0.book_list =
608  av_malloc(floor_setup->data.t0.num_books);
609  if (!floor_setup->data.t0.book_list)
610  return AVERROR(ENOMEM);
611  /* read book indexes */
612  {
613  int idx;
614  unsigned book_idx;
615  for (idx = 0; idx < floor_setup->data.t0.num_books; ++idx) {
616  GET_VALIDATED_INDEX(book_idx, 8, vc->codebook_count)
617  floor_setup->data.t0.book_list[idx] = book_idx;
618  if (vc->codebooks[book_idx].dimensions > max_codebook_dim)
619  max_codebook_dim = vc->codebooks[book_idx].dimensions;
620  }
621  }
622 
623  create_map(vc, i);
624 
625  /* codebook dim is for padding if codebook dim doesn't *
626  * divide order+1 then we need to read more data */
627  floor_setup->data.t0.lsp =
628  av_malloc((floor_setup->data.t0.order + 1 + max_codebook_dim)
629  * sizeof(*floor_setup->data.t0.lsp));
630  if (!floor_setup->data.t0.lsp)
631  return AVERROR(ENOMEM);
632 
633  /* debug output parsed headers */
634  av_dlog(NULL, "floor0 order: %u\n", floor_setup->data.t0.order);
635  av_dlog(NULL, "floor0 rate: %u\n", floor_setup->data.t0.rate);
636  av_dlog(NULL, "floor0 bark map size: %u\n",
637  floor_setup->data.t0.bark_map_size);
638  av_dlog(NULL, "floor0 amplitude bits: %u\n",
639  floor_setup->data.t0.amplitude_bits);
640  av_dlog(NULL, "floor0 amplitude offset: %u\n",
641  floor_setup->data.t0.amplitude_offset);
642  av_dlog(NULL, "floor0 number of books: %u\n",
643  floor_setup->data.t0.num_books);
644  av_dlog(NULL, "floor0 book list pointer: %p\n",
645  floor_setup->data.t0.book_list);
646  {
647  int idx;
648  for (idx = 0; idx < floor_setup->data.t0.num_books; ++idx) {
649  av_dlog(NULL, " Book %d: %u\n", idx + 1,
650  floor_setup->data.t0.book_list[idx]);
651  }
652  }
653  } else {
654  av_log(vc->avccontext, AV_LOG_ERROR, "Invalid floor type!\n");
655  return AVERROR_INVALIDDATA;
656  }
657  }
658  return 0;
659 }
660 
661 // Process residues part
662 
664 {
665  GetBitContext *gb = &vc->gb;
666  unsigned i, j, k;
667 
668  vc->residue_count = get_bits(gb, 6)+1;
669  vc->residues = av_mallocz(vc->residue_count * sizeof(*vc->residues));
670 
671  av_dlog(NULL, " There are %d residues. \n", vc->residue_count);
672 
673  for (i = 0; i < vc->residue_count; ++i) {
674  vorbis_residue *res_setup = &vc->residues[i];
675  uint8_t cascade[64];
676  unsigned high_bits, low_bits;
677 
678  res_setup->type = get_bits(gb, 16);
679 
680  av_dlog(NULL, " %u. residue type %d\n", i, res_setup->type);
681 
682  res_setup->begin = get_bits(gb, 24);
683  res_setup->end = get_bits(gb, 24);
684  res_setup->partition_size = get_bits(gb, 24) + 1;
685  /* Validations to prevent a buffer overflow later. */
686  if (res_setup->begin>res_setup->end ||
687  res_setup->end > (res_setup->type == 2 ? vc->avccontext->channels : 1) * vc->blocksize[1] / 2 ||
688  (res_setup->end-res_setup->begin) / res_setup->partition_size > V_MAX_PARTITIONS) {
690  "partition out of bounds: type, begin, end, size, blocksize: %"PRIu16", %"PRIu32", %"PRIu32", %u, %"PRIu32"\n",
691  res_setup->type, res_setup->begin, res_setup->end,
692  res_setup->partition_size, vc->blocksize[1] / 2);
693  return AVERROR_INVALIDDATA;
694  }
695 
696  res_setup->classifications = get_bits(gb, 6) + 1;
697  GET_VALIDATED_INDEX(res_setup->classbook, 8, vc->codebook_count)
698 
699  res_setup->ptns_to_read =
700  (res_setup->end - res_setup->begin) / res_setup->partition_size;
701  res_setup->classifs = av_malloc(res_setup->ptns_to_read *
702  vc->audio_channels *
703  sizeof(*res_setup->classifs));
704  if (!res_setup->classifs)
705  return AVERROR(ENOMEM);
706 
707  av_dlog(NULL, " begin %d end %d part.size %d classif.s %d classbook %d \n",
708  res_setup->begin, res_setup->end, res_setup->partition_size,
709  res_setup->classifications, res_setup->classbook);
710 
711  for (j = 0; j < res_setup->classifications; ++j) {
712  high_bits = 0;
713  low_bits = get_bits(gb, 3);
714  if (get_bits1(gb))
715  high_bits = get_bits(gb, 5);
716  cascade[j] = (high_bits << 3) + low_bits;
717 
718  av_dlog(NULL, " %u class cascade depth: %d\n", j, ilog(cascade[j]));
719  }
720 
721  res_setup->maxpass = 0;
722  for (j = 0; j < res_setup->classifications; ++j) {
723  for (k = 0; k < 8; ++k) {
724  if (cascade[j]&(1 << k)) {
725  GET_VALIDATED_INDEX(res_setup->books[j][k], 8, vc->codebook_count)
726 
727  av_dlog(NULL, " %u class cascade depth %u book: %d\n",
728  j, k, res_setup->books[j][k]);
729 
730  if (k>res_setup->maxpass)
731  res_setup->maxpass = k;
732  } else {
733  res_setup->books[j][k] = -1;
734  }
735  }
736  }
737  }
738  return 0;
739 }
740 
741 // Process mappings part
742 
744 {
745  GetBitContext *gb = &vc->gb;
746  unsigned i, j;
747 
748  vc->mapping_count = get_bits(gb, 6)+1;
749  vc->mappings = av_mallocz(vc->mapping_count * sizeof(*vc->mappings));
750 
751  av_dlog(NULL, " There are %d mappings. \n", vc->mapping_count);
752 
753  for (i = 0; i < vc->mapping_count; ++i) {
754  vorbis_mapping *mapping_setup = &vc->mappings[i];
755 
756  if (get_bits(gb, 16)) {
757  av_log(vc->avccontext, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n");
758  return AVERROR_INVALIDDATA;
759  }
760  if (get_bits1(gb)) {
761  mapping_setup->submaps = get_bits(gb, 4) + 1;
762  } else {
763  mapping_setup->submaps = 1;
764  }
765 
766  if (get_bits1(gb)) {
767  mapping_setup->coupling_steps = get_bits(gb, 8) + 1;
768  mapping_setup->magnitude = av_mallocz(mapping_setup->coupling_steps *
769  sizeof(*mapping_setup->magnitude));
770  mapping_setup->angle = av_mallocz(mapping_setup->coupling_steps *
771  sizeof(*mapping_setup->angle));
772  for (j = 0; j < mapping_setup->coupling_steps; ++j) {
773  GET_VALIDATED_INDEX(mapping_setup->magnitude[j], ilog(vc->audio_channels - 1), vc->audio_channels)
774  GET_VALIDATED_INDEX(mapping_setup->angle[j], ilog(vc->audio_channels - 1), vc->audio_channels)
775  }
776  } else {
777  mapping_setup->coupling_steps = 0;
778  }
779 
780  av_dlog(NULL, " %u mapping coupling steps: %d\n",
781  i, mapping_setup->coupling_steps);
782 
783  if (get_bits(gb, 2)) {
784  av_log(vc->avccontext, AV_LOG_ERROR, "%u. mapping setup data invalid.\n", i);
785  return AVERROR_INVALIDDATA; // following spec.
786  }
787 
788  if (mapping_setup->submaps>1) {
789  mapping_setup->mux = av_mallocz(vc->audio_channels *
790  sizeof(*mapping_setup->mux));
791  for (j = 0; j < vc->audio_channels; ++j)
792  mapping_setup->mux[j] = get_bits(gb, 4);
793  }
794 
795  for (j = 0; j < mapping_setup->submaps; ++j) {
796  skip_bits(gb, 8); // FIXME check?
797  GET_VALIDATED_INDEX(mapping_setup->submap_floor[j], 8, vc->floor_count)
798  GET_VALIDATED_INDEX(mapping_setup->submap_residue[j], 8, vc->residue_count)
799 
800  av_dlog(NULL, " %u mapping %u submap : floor %d, residue %d\n", i, j,
801  mapping_setup->submap_floor[j],
802  mapping_setup->submap_residue[j]);
803  }
804  }
805  return 0;
806 }
807 
808 // Process modes part
809 
810 static void create_map(vorbis_context *vc, unsigned floor_number)
811 {
812  vorbis_floor *floors = vc->floors;
813  vorbis_floor0 *vf;
814  int idx;
815  int blockflag, n;
816  int32_t *map;
817 
818  for (blockflag = 0; blockflag < 2; ++blockflag) {
819  n = vc->blocksize[blockflag] / 2;
820  floors[floor_number].data.t0.map[blockflag] =
821  av_malloc((n + 1) * sizeof(int32_t)); // n + sentinel
822 
823  map = floors[floor_number].data.t0.map[blockflag];
824  vf = &floors[floor_number].data.t0;
825 
826  for (idx = 0; idx < n; ++idx) {
827  map[idx] = floor(BARK((vf->rate * idx) / (2.0f * n)) *
828  (vf->bark_map_size / BARK(vf->rate / 2.0f)));
829  if (vf->bark_map_size-1 < map[idx])
830  map[idx] = vf->bark_map_size - 1;
831  }
832  map[n] = -1;
833  vf->map_size[blockflag] = n;
834  }
835 
836  for (idx = 0; idx <= n; ++idx) {
837  av_dlog(NULL, "floor0 map: map at pos %d is %d\n", idx, map[idx]);
838  }
839 }
840 
842 {
843  GetBitContext *gb = &vc->gb;
844  unsigned i;
845 
846  vc->mode_count = get_bits(gb, 6) + 1;
847  vc->modes = av_mallocz(vc->mode_count * sizeof(*vc->modes));
848 
849  av_dlog(NULL, " There are %d modes.\n", vc->mode_count);
850 
851  for (i = 0; i < vc->mode_count; ++i) {
852  vorbis_mode *mode_setup = &vc->modes[i];
853 
854  mode_setup->blockflag = get_bits1(gb);
855  mode_setup->windowtype = get_bits(gb, 16); //FIXME check
856  mode_setup->transformtype = get_bits(gb, 16); //FIXME check
857  GET_VALIDATED_INDEX(mode_setup->mapping, 8, vc->mapping_count);
858 
859  av_dlog(NULL, " %u mode: blockflag %d, windowtype %d, transformtype %d, mapping %d\n",
860  i, mode_setup->blockflag, mode_setup->windowtype,
861  mode_setup->transformtype, mode_setup->mapping);
862  }
863  return 0;
864 }
865 
866 // Process the whole setup header using the functions above
867 
869 {
870  GetBitContext *gb = &vc->gb;
871  int ret;
872 
873  if ((get_bits(gb, 8) != 'v') || (get_bits(gb, 8) != 'o') ||
874  (get_bits(gb, 8) != 'r') || (get_bits(gb, 8) != 'b') ||
875  (get_bits(gb, 8) != 'i') || (get_bits(gb, 8) != 's')) {
876  av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n");
877  return AVERROR_INVALIDDATA;
878  }
879 
880  if ((ret = vorbis_parse_setup_hdr_codebooks(vc))) {
881  av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n");
882  return ret;
883  }
884  if ((ret = vorbis_parse_setup_hdr_tdtransforms(vc))) {
885  av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n");
886  return ret;
887  }
888  if ((ret = vorbis_parse_setup_hdr_floors(vc))) {
889  av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n");
890  return ret;
891  }
892  if ((ret = vorbis_parse_setup_hdr_residues(vc))) {
893  av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n");
894  return ret;
895  }
896  if ((ret = vorbis_parse_setup_hdr_mappings(vc))) {
897  av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n");
898  return ret;
899  }
900  if ((ret = vorbis_parse_setup_hdr_modes(vc))) {
901  av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n");
902  return ret;
903  }
904  if (!get_bits1(gb)) {
905  av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n");
906  return AVERROR_INVALIDDATA; // framing flag bit unset error
907  }
908 
909  return 0;
910 }
911 
912 // Process the identification header
913 
915 {
916  GetBitContext *gb = &vc->gb;
917  unsigned bl0, bl1;
918 
919  if ((get_bits(gb, 8) != 'v') || (get_bits(gb, 8) != 'o') ||
920  (get_bits(gb, 8) != 'r') || (get_bits(gb, 8) != 'b') ||
921  (get_bits(gb, 8) != 'i') || (get_bits(gb, 8) != 's')) {
922  av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n");
923  return AVERROR_INVALIDDATA;
924  }
925 
926  vc->version = get_bits_long(gb, 32); //FIXME check 0
927  vc->audio_channels = get_bits(gb, 8);
928  if (vc->audio_channels <= 0) {
929  av_log(vc->avccontext, AV_LOG_ERROR, "Invalid number of channels\n");
930  return AVERROR_INVALIDDATA;
931  }
932  vc->audio_samplerate = get_bits_long(gb, 32);
933  if (vc->audio_samplerate <= 0) {
934  av_log(vc->avccontext, AV_LOG_ERROR, "Invalid samplerate\n");
935  return AVERROR_INVALIDDATA;
936  }
937  vc->bitrate_maximum = get_bits_long(gb, 32);
938  vc->bitrate_nominal = get_bits_long(gb, 32);
939  vc->bitrate_minimum = get_bits_long(gb, 32);
940  bl0 = get_bits(gb, 4);
941  bl1 = get_bits(gb, 4);
942  vc->blocksize[0] = (1 << bl0);
943  vc->blocksize[1] = (1 << bl1);
944  if (bl0 > 13 || bl0 < 6 || bl1 > 13 || bl1 < 6 || bl1 < bl0) {
945  av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n");
946  return AVERROR_INVALIDDATA;
947  }
948  vc->win[0] = ff_vorbis_vwin[bl0 - 6];
949  vc->win[1] = ff_vorbis_vwin[bl1 - 6];
950 
951  if ((get_bits1(gb)) == 0) {
952  av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n");
953  return AVERROR_INVALIDDATA;
954  }
955 
956  vc->channel_residues = av_malloc((vc->blocksize[1] / 2) * vc->audio_channels * sizeof(*vc->channel_residues));
957  vc->channel_floors = av_malloc((vc->blocksize[1] / 2) * vc->audio_channels * sizeof(*vc->channel_floors));
958  vc->saved = av_mallocz((vc->blocksize[1] / 4) * vc->audio_channels * sizeof(*vc->saved));
959  vc->previous_window = 0;
960 
961  ff_mdct_init(&vc->mdct[0], bl0, 1, -vc->scale_bias);
962  ff_mdct_init(&vc->mdct[1], bl1, 1, -vc->scale_bias);
963 
964  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 ",
966 
967 /*
968  BLK = vc->blocksize[0];
969  for (i = 0; i < BLK / 2; ++i) {
970  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)));
971  }
972 */
973 
974  return 0;
975 }
976 
977 // Process the extradata using the functions above (identification header, setup header)
978 
980 {
981  vorbis_context *vc = avccontext->priv_data;
982  uint8_t *headers = avccontext->extradata;
983  int headers_len = avccontext->extradata_size;
984  uint8_t *header_start[3];
985  int header_len[3];
986  GetBitContext *gb = &vc->gb;
987  int hdr_type, ret;
988 
989  vc->avccontext = avccontext;
990  dsputil_init(&vc->dsp, avccontext);
991  ff_fmt_convert_init(&vc->fmt_conv, avccontext);
992 
993  if (avccontext->request_sample_fmt == AV_SAMPLE_FMT_FLT) {
994  avccontext->sample_fmt = AV_SAMPLE_FMT_FLT;
995  vc->scale_bias = 1.0f;
996  } else {
997  avccontext->sample_fmt = AV_SAMPLE_FMT_S16;
998  vc->scale_bias = 32768.0f;
999  }
1000 
1001  if (!headers_len) {
1002  av_log(avccontext, AV_LOG_ERROR, "Extradata missing.\n");
1003  return AVERROR_INVALIDDATA;
1004  }
1005 
1006  if ((ret = avpriv_split_xiph_headers(headers, headers_len, 30, header_start, header_len)) < 0) {
1007  av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
1008  return ret;
1009  }
1010 
1011  init_get_bits(gb, header_start[0], header_len[0]*8);
1012  hdr_type = get_bits(gb, 8);
1013  if (hdr_type != 1) {
1014  av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n");
1015  return AVERROR_INVALIDDATA;
1016  }
1017  if ((ret = vorbis_parse_id_hdr(vc))) {
1018  av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n");
1019  vorbis_free(vc);
1020  return ret;
1021  }
1022 
1023  init_get_bits(gb, header_start[2], header_len[2]*8);
1024  hdr_type = get_bits(gb, 8);
1025  if (hdr_type != 5) {
1026  av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");
1027  vorbis_free(vc);
1028  return AVERROR_INVALIDDATA;
1029  }
1030  if ((ret = vorbis_parse_setup_hdr(vc))) {
1031  av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");
1032  vorbis_free(vc);
1033  return ret;
1034  }
1035 
1036  if (vc->audio_channels > 8)
1037  avccontext->channel_layout = 0;
1038  else
1040 
1041  avccontext->channels = vc->audio_channels;
1042  avccontext->sample_rate = vc->audio_samplerate;
1043  avccontext->frame_size = FFMIN(vc->blocksize[0], vc->blocksize[1]) >> 2;
1044 
1046  avccontext->coded_frame = &vc->frame;
1047 
1048  return 0;
1049 }
1050 
1051 // Decode audiopackets -------------------------------------------------
1052 
1053 // Read and decode floor
1054 
1056  vorbis_floor_data *vfu, float *vec)
1057 {
1058  vorbis_floor0 *vf = &vfu->t0;
1059  float *lsp = vf->lsp;
1060  unsigned amplitude, book_idx;
1061  unsigned blockflag = vc->modes[vc->mode_number].blockflag;
1062 
1063  amplitude = get_bits(&vc->gb, vf->amplitude_bits);
1064  if (amplitude > 0) {
1065  float last = 0;
1066  unsigned idx, lsp_len = 0;
1067  vorbis_codebook codebook;
1068 
1069  book_idx = get_bits(&vc->gb, ilog(vf->num_books));
1070  if (book_idx >= vf->num_books) {
1072  "floor0 dec: booknumber too high!\n");
1073  book_idx = 0;
1074  }
1075  av_dlog(NULL, "floor0 dec: booknumber: %u\n", book_idx);
1076  codebook = vc->codebooks[vf->book_list[book_idx]];
1077  /* Invalid codebook! */
1078  if (!codebook.codevectors)
1079  return AVERROR_INVALIDDATA;
1080 
1081  while (lsp_len<vf->order) {
1082  int vec_off;
1083 
1084  av_dlog(NULL, "floor0 dec: book dimension: %d\n", codebook.dimensions);
1085  av_dlog(NULL, "floor0 dec: maximum depth: %d\n", codebook.maxdepth);
1086  /* read temp vector */
1087  vec_off = get_vlc2(&vc->gb, codebook.vlc.table,
1088  codebook.nb_bits, codebook.maxdepth)
1089  * codebook.dimensions;
1090  av_dlog(NULL, "floor0 dec: vector offset: %d\n", vec_off);
1091  /* copy each vector component and add last to it */
1092  for (idx = 0; idx < codebook.dimensions; ++idx)
1093  lsp[lsp_len+idx] = codebook.codevectors[vec_off+idx] + last;
1094  last = lsp[lsp_len+idx-1]; /* set last to last vector component */
1095 
1096  lsp_len += codebook.dimensions;
1097  }
1098  /* DEBUG: output lsp coeffs */
1099  {
1100  int idx;
1101  for (idx = 0; idx < lsp_len; ++idx)
1102  av_dlog(NULL, "floor0 dec: coeff at %d is %f\n", idx, lsp[idx]);
1103  }
1104 
1105  /* synthesize floor output vector */
1106  {
1107  int i;
1108  int order = vf->order;
1109  float wstep = M_PI / vf->bark_map_size;
1110 
1111  for (i = 0; i < order; i++)
1112  lsp[i] = 2.0f * cos(lsp[i]);
1113 
1114  av_dlog(NULL, "floor0 synth: map_size = %"PRIu32"; m = %d; wstep = %f\n",
1115  vf->map_size[blockflag], order, wstep);
1116 
1117  i = 0;
1118  while (i < vf->map_size[blockflag]) {
1119  int j, iter_cond = vf->map[blockflag][i];
1120  float p = 0.5f;
1121  float q = 0.5f;
1122  float two_cos_w = 2.0f * cos(wstep * iter_cond); // needed all times
1123 
1124  /* similar part for the q and p products */
1125  for (j = 0; j + 1 < order; j += 2) {
1126  q *= lsp[j] - two_cos_w;
1127  p *= lsp[j + 1] - two_cos_w;
1128  }
1129  if (j == order) { // even order
1130  p *= p * (2.0f - two_cos_w);
1131  q *= q * (2.0f + two_cos_w);
1132  } else { // odd order
1133  q *= two_cos_w-lsp[j]; // one more time for q
1134 
1135  /* final step and square */
1136  p *= p * (4.f - two_cos_w * two_cos_w);
1137  q *= q;
1138  }
1139 
1140  /* calculate linear floor value */
1141  q = exp((((amplitude*vf->amplitude_offset) /
1142  (((1 << vf->amplitude_bits) - 1) * sqrt(p + q)))
1143  - vf->amplitude_offset) * .11512925f);
1144 
1145  /* fill vector */
1146  do {
1147  vec[i] = q; ++i;
1148  } while (vf->map[blockflag][i] == iter_cond);
1149  }
1150  }
1151  } else {
1152  /* this channel is unused */
1153  return 1;
1154  }
1155 
1156  av_dlog(NULL, " Floor0 decoded\n");
1157 
1158  return 0;
1159 }
1160 
1162  vorbis_floor_data *vfu, float *vec)
1163 {
1164  vorbis_floor1 *vf = &vfu->t1;
1165  GetBitContext *gb = &vc->gb;
1166  uint16_t range_v[4] = { 256, 128, 86, 64 };
1167  unsigned range = range_v[vf->multiplier - 1];
1168  uint16_t floor1_Y[258];
1169  uint16_t floor1_Y_final[258];
1170  int floor1_flag[258];
1171  unsigned class, cdim, cbits, csub, cval, offset, i, j;
1172  int book, adx, ady, dy, off, predicted, err;
1173 
1174 
1175  if (!get_bits1(gb)) // silence
1176  return 1;
1177 
1178 // Read values (or differences) for the floor's points
1179 
1180  floor1_Y[0] = get_bits(gb, ilog(range - 1));
1181  floor1_Y[1] = get_bits(gb, ilog(range - 1));
1182 
1183  av_dlog(NULL, "floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);
1184 
1185  offset = 2;
1186  for (i = 0; i < vf->partitions; ++i) {
1187  class = vf->partition_class[i];
1188  cdim = vf->class_dimensions[class];
1189  cbits = vf->class_subclasses[class];
1190  csub = (1 << cbits) - 1;
1191  cval = 0;
1192 
1193  av_dlog(NULL, "Cbits %u\n", cbits);
1194 
1195  if (cbits) // this reads all subclasses for this partition's class
1196  cval = get_vlc2(gb, vc->codebooks[vf->class_masterbook[class]].vlc.table,
1197  vc->codebooks[vf->class_masterbook[class]].nb_bits, 3);
1198 
1199  for (j = 0; j < cdim; ++j) {
1200  book = vf->subclass_books[class][cval & csub];
1201 
1202  av_dlog(NULL, "book %d Cbits %u cval %u bits:%d\n",
1203  book, cbits, cval, get_bits_count(gb));
1204 
1205  cval = cval >> cbits;
1206  if (book > -1) {
1207  floor1_Y[offset+j] = get_vlc2(gb, vc->codebooks[book].vlc.table,
1208  vc->codebooks[book].nb_bits, 3);
1209  } else {
1210  floor1_Y[offset+j] = 0;
1211  }
1212 
1213  av_dlog(NULL, " floor(%d) = %d \n",
1214  vf->list[offset+j].x, floor1_Y[offset+j]);
1215  }
1216  offset+=cdim;
1217  }
1218 
1219 // Amplitude calculation from the differences
1220 
1221  floor1_flag[0] = 1;
1222  floor1_flag[1] = 1;
1223  floor1_Y_final[0] = floor1_Y[0];
1224  floor1_Y_final[1] = floor1_Y[1];
1225 
1226  for (i = 2; i < vf->x_list_dim; ++i) {
1227  unsigned val, highroom, lowroom, room, high_neigh_offs, low_neigh_offs;
1228 
1229  low_neigh_offs = vf->list[i].low;
1230  high_neigh_offs = vf->list[i].high;
1231  dy = floor1_Y_final[high_neigh_offs] - floor1_Y_final[low_neigh_offs]; // render_point begin
1232  adx = vf->list[high_neigh_offs].x - vf->list[low_neigh_offs].x;
1233  ady = FFABS(dy);
1234  err = ady * (vf->list[i].x - vf->list[low_neigh_offs].x);
1235  off = err / adx;
1236  if (dy < 0) {
1237  predicted = floor1_Y_final[low_neigh_offs] - off;
1238  } else {
1239  predicted = floor1_Y_final[low_neigh_offs] + off;
1240  } // render_point end
1241 
1242  val = floor1_Y[i];
1243  highroom = range-predicted;
1244  lowroom = predicted;
1245  if (highroom < lowroom) {
1246  room = highroom * 2;
1247  } else {
1248  room = lowroom * 2; // SPEC mispelling
1249  }
1250  if (val) {
1251  floor1_flag[low_neigh_offs] = 1;
1252  floor1_flag[high_neigh_offs] = 1;
1253  floor1_flag[i] = 1;
1254  if (val >= room) {
1255  if (highroom > lowroom) {
1256  floor1_Y_final[i] = av_clip_uint16(val - lowroom + predicted);
1257  } else {
1258  floor1_Y_final[i] = av_clip_uint16(predicted - val + highroom - 1);
1259  }
1260  } else {
1261  if (val & 1) {
1262  floor1_Y_final[i] = av_clip_uint16(predicted - (val + 1) / 2);
1263  } else {
1264  floor1_Y_final[i] = av_clip_uint16(predicted + val / 2);
1265  }
1266  }
1267  } else {
1268  floor1_flag[i] = 0;
1269  floor1_Y_final[i] = av_clip_uint16(predicted);
1270  }
1271 
1272  av_dlog(NULL, " Decoded floor(%d) = %u / val %u\n",
1273  vf->list[i].x, floor1_Y_final[i], val);
1274  }
1275 
1276 // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?
1277 
1278  ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);
1279 
1280  av_dlog(NULL, " Floor decoded\n");
1281 
1282  return 0;
1283 }
1284 
1285 // Read and decode residue
1286 
1288  vorbis_residue *vr,
1289  unsigned ch,
1290  uint8_t *do_not_decode,
1291  float *vec,
1292  unsigned vlen,
1293  unsigned ch_left,
1294  int vr_type)
1295 {
1296  GetBitContext *gb = &vc->gb;
1297  unsigned c_p_c = vc->codebooks[vr->classbook].dimensions;
1298  unsigned ptns_to_read = vr->ptns_to_read;
1299  uint8_t *classifs = vr->classifs;
1300  unsigned pass, ch_used, i, j, k, l;
1301  unsigned max_output = (ch - 1) * vlen;
1302 
1303  if (vr_type == 2) {
1304  for (j = 1; j < ch; ++j)
1305  do_not_decode[0] &= do_not_decode[j]; // FIXME - clobbering input
1306  if (do_not_decode[0])
1307  return 0;
1308  ch_used = 1;
1309  max_output += vr->end / ch;
1310  } else {
1311  ch_used = ch;
1312  max_output += vr->end;
1313  }
1314 
1315  if (max_output > ch_left * vlen) {
1316  av_log(vc->avccontext, AV_LOG_ERROR, "Insufficient output buffer\n");
1317  return -1;
1318  }
1319 
1320  av_dlog(NULL, " residue type 0/1/2 decode begin, ch: %d cpc %d \n", ch, c_p_c);
1321 
1322  for (pass = 0; pass <= vr->maxpass; ++pass) { // FIXME OPTIMIZE?
1323  uint16_t voffset, partition_count, j_times_ptns_to_read;
1324 
1325  voffset = vr->begin;
1326  for (partition_count = 0; partition_count < ptns_to_read;) { // SPEC error
1327  if (!pass) {
1328  unsigned inverse_class = ff_inverse[vr->classifications];
1329  for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {
1330  if (!do_not_decode[j]) {
1331  unsigned temp = get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,
1332  vc->codebooks[vr->classbook].nb_bits, 3);
1333 
1334  av_dlog(NULL, "Classword: %u\n", temp);
1335 
1336  assert(vr->classifications > 1 && temp <= 65536); //needed for inverse[]
1337  for (i = 0; i < c_p_c; ++i) {
1338  unsigned temp2;
1339 
1340  temp2 = (((uint64_t)temp) * inverse_class) >> 32;
1341  if (partition_count + c_p_c - 1 - i < ptns_to_read)
1342  classifs[j_times_ptns_to_read + partition_count + c_p_c - 1 - i] = temp - temp2 * vr->classifications;
1343  temp = temp2;
1344  }
1345  }
1346  j_times_ptns_to_read += ptns_to_read;
1347  }
1348  }
1349  for (i = 0; (i < c_p_c) && (partition_count < ptns_to_read); ++i) {
1350  for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {
1351  unsigned voffs;
1352 
1353  if (!do_not_decode[j]) {
1354  unsigned vqclass = classifs[j_times_ptns_to_read + partition_count];
1355  int vqbook = vr->books[vqclass][pass];
1356 
1357  if (vqbook >= 0 && vc->codebooks[vqbook].codevectors) {
1358  unsigned coffs;
1359  unsigned dim = vc->codebooks[vqbook].dimensions;
1360  unsigned step = dim == 1 ? vr->partition_size
1361  : FASTDIV(vr->partition_size, dim);
1362  vorbis_codebook codebook = vc->codebooks[vqbook];
1363 
1364  if (vr_type == 0) {
1365 
1366  voffs = voffset+j*vlen;
1367  for (k = 0; k < step; ++k) {
1368  coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1369  for (l = 0; l < dim; ++l)
1370  vec[voffs + k + l * step] += codebook.codevectors[coffs + l]; // FPMATH
1371  }
1372  } else if (vr_type == 1) {
1373  voffs = voffset + j * vlen;
1374  for (k = 0; k < step; ++k) {
1375  coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1376  for (l = 0; l < dim; ++l, ++voffs) {
1377  vec[voffs]+=codebook.codevectors[coffs+l]; // FPMATH
1378 
1379  av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d \n",
1380  pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);
1381  }
1382  }
1383  } else if (vr_type == 2 && ch == 2 && (voffset & 1) == 0 && (dim & 1) == 0) { // most frequent case optimized
1384  voffs = voffset >> 1;
1385 
1386  if (dim == 2) {
1387  for (k = 0; k < step; ++k) {
1388  coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;
1389  vec[voffs + k ] += codebook.codevectors[coffs ]; // FPMATH
1390  vec[voffs + k + vlen] += codebook.codevectors[coffs + 1]; // FPMATH
1391  }
1392  } else if (dim == 4) {
1393  for (k = 0; k < step; ++k, voffs += 2) {
1394  coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4;
1395  vec[voffs ] += codebook.codevectors[coffs ]; // FPMATH
1396  vec[voffs + 1 ] += codebook.codevectors[coffs + 2]; // FPMATH
1397  vec[voffs + vlen ] += codebook.codevectors[coffs + 1]; // FPMATH
1398  vec[voffs + vlen + 1] += codebook.codevectors[coffs + 3]; // FPMATH
1399  }
1400  } else
1401  for (k = 0; k < step; ++k) {
1402  coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1403  for (l = 0; l < dim; l += 2, voffs++) {
1404  vec[voffs ] += codebook.codevectors[coffs + l ]; // FPMATH
1405  vec[voffs + vlen] += codebook.codevectors[coffs + l + 1]; // FPMATH
1406 
1407  av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d+%d \n",
1408  pass, voffset / ch + (voffs % ch) * vlen,
1409  vec[voffset / ch + (voffs % ch) * vlen],
1410  codebook.codevectors[coffs + l], coffs, l);
1411  }
1412  }
1413 
1414  } else if (vr_type == 2) {
1415  voffs = voffset;
1416 
1417  for (k = 0; k < step; ++k) {
1418  coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1419  for (l = 0; l < dim; ++l, ++voffs) {
1420  vec[voffs / ch + (voffs % ch) * vlen] += codebook.codevectors[coffs + l]; // FPMATH FIXME use if and counter instead of / and %
1421 
1422  av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d+%d \n",
1423  pass, voffset / ch + (voffs % ch) * vlen,
1424  vec[voffset / ch + (voffs % ch) * vlen],
1425  codebook.codevectors[coffs + l], coffs, l);
1426  }
1427  }
1428  }
1429  }
1430  }
1431  j_times_ptns_to_read += ptns_to_read;
1432  }
1433  ++partition_count;
1434  voffset += vr->partition_size;
1435  }
1436  }
1437  }
1438  return 0;
1439 }
1440 
1442  unsigned ch,
1443  uint8_t *do_not_decode,
1444  float *vec, unsigned vlen,
1445  unsigned ch_left)
1446 {
1447  if (vr->type == 2)
1448  return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 2);
1449  else if (vr->type == 1)
1450  return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 1);
1451  else if (vr->type == 0)
1452  return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 0);
1453  else {
1454  av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");
1455  return AVERROR_INVALIDDATA;
1456  }
1457 }
1458 
1459 void vorbis_inverse_coupling(float *mag, float *ang, int blocksize)
1460 {
1461  int i;
1462  for (i = 0; i < blocksize; i++) {
1463  if (mag[i] > 0.0) {
1464  if (ang[i] > 0.0) {
1465  ang[i] = mag[i] - ang[i];
1466  } else {
1467  float temp = ang[i];
1468  ang[i] = mag[i];
1469  mag[i] += temp;
1470  }
1471  } else {
1472  if (ang[i] > 0.0) {
1473  ang[i] += mag[i];
1474  } else {
1475  float temp = ang[i];
1476  ang[i] = mag[i];
1477  mag[i] -= temp;
1478  }
1479  }
1480  }
1481 }
1482 
1483 // Decode the audio packet using the functions above
1484 
1486 {
1487  GetBitContext *gb = &vc->gb;
1488  FFTContext *mdct;
1489  unsigned previous_window = vc->previous_window;
1490  unsigned mode_number, blockflag, blocksize;
1491  int i, j;
1492  uint8_t no_residue[255];
1493  uint8_t do_not_decode[255];
1494  vorbis_mapping *mapping;
1495  float *ch_res_ptr = vc->channel_residues;
1496  float *ch_floor_ptr = vc->channel_floors;
1497  uint8_t res_chan[255];
1498  unsigned res_num = 0;
1499  int retlen = 0;
1500  unsigned ch_left = vc->audio_channels;
1501  unsigned vlen;
1502 
1503  if (get_bits1(gb)) {
1504  av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");
1505  return AVERROR_INVALIDDATA; // packet type not audio
1506  }
1507 
1508  if (vc->mode_count == 1) {
1509  mode_number = 0;
1510  } else {
1511  GET_VALIDATED_INDEX(mode_number, ilog(vc->mode_count-1), vc->mode_count)
1512  }
1513  vc->mode_number = mode_number;
1514  mapping = &vc->mappings[vc->modes[mode_number].mapping];
1515 
1516  av_dlog(NULL, " Mode number: %u , mapping: %d , blocktype %d\n", mode_number,
1517  vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);
1518 
1519  blockflag = vc->modes[mode_number].blockflag;
1520  blocksize = vc->blocksize[blockflag];
1521  vlen = blocksize / 2;
1522  if (blockflag)
1523  skip_bits(gb, 2); // previous_window, next_window
1524 
1525  memset(ch_res_ptr, 0, sizeof(float) * vc->audio_channels * vlen); //FIXME can this be removed ?
1526  memset(ch_floor_ptr, 0, sizeof(float) * vc->audio_channels * vlen); //FIXME can this be removed ?
1527 
1528 // Decode floor
1529 
1530  for (i = 0; i < vc->audio_channels; ++i) {
1531  vorbis_floor *floor;
1532  int ret;
1533  if (mapping->submaps > 1) {
1534  floor = &vc->floors[mapping->submap_floor[mapping->mux[i]]];
1535  } else {
1536  floor = &vc->floors[mapping->submap_floor[0]];
1537  }
1538 
1539  ret = floor->decode(vc, &floor->data, ch_floor_ptr);
1540 
1541  if (ret < 0) {
1542  av_log(vc->avccontext, AV_LOG_ERROR, "Invalid codebook in vorbis_floor_decode.\n");
1543  return AVERROR_INVALIDDATA;
1544  }
1545  no_residue[i] = ret;
1546  ch_floor_ptr += vlen;
1547  }
1548 
1549 // Nonzero vector propagate
1550 
1551  for (i = mapping->coupling_steps - 1; i >= 0; --i) {
1552  if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {
1553  no_residue[mapping->magnitude[i]] = 0;
1554  no_residue[mapping->angle[i]] = 0;
1555  }
1556  }
1557 
1558 // Decode residue
1559 
1560  for (i = 0; i < mapping->submaps; ++i) {
1561  vorbis_residue *residue;
1562  unsigned ch = 0;
1563  int ret;
1564 
1565  for (j = 0; j < vc->audio_channels; ++j) {
1566  if ((mapping->submaps == 1) || (i == mapping->mux[j])) {
1567  res_chan[j] = res_num;
1568  if (no_residue[j]) {
1569  do_not_decode[ch] = 1;
1570  } else {
1571  do_not_decode[ch] = 0;
1572  }
1573  ++ch;
1574  ++res_num;
1575  }
1576  }
1577  residue = &vc->residues[mapping->submap_residue[i]];
1578  if (ch_left < ch) {
1579  av_log(vc->avccontext, AV_LOG_ERROR, "Too many channels in vorbis_floor_decode.\n");
1580  return -1;
1581  }
1582  if (ch) {
1583  ret = vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, vlen, ch_left);
1584  if (ret < 0)
1585  return ret;
1586  }
1587 
1588  ch_res_ptr += ch * vlen;
1589  ch_left -= ch;
1590  }
1591 
1592 // Inverse coupling
1593 
1594  for (i = mapping->coupling_steps - 1; i >= 0; --i) { //warning: i has to be signed
1595  float *mag, *ang;
1596 
1597  mag = vc->channel_residues+res_chan[mapping->magnitude[i]] * blocksize / 2;
1598  ang = vc->channel_residues+res_chan[mapping->angle[i]] * blocksize / 2;
1599  vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize / 2);
1600  }
1601 
1602 // Dotproduct, MDCT
1603 
1604  mdct = &vc->mdct[blockflag];
1605 
1606  for (j = vc->audio_channels-1;j >= 0; j--) {
1607  ch_floor_ptr = vc->channel_floors + j * blocksize / 2;
1608  ch_res_ptr = vc->channel_residues + res_chan[j] * blocksize / 2;
1609  vc->dsp.vector_fmul(ch_floor_ptr, ch_floor_ptr, ch_res_ptr, blocksize / 2);
1610  mdct->imdct_half(mdct, ch_res_ptr, ch_floor_ptr);
1611  }
1612 
1613 // Overlap/add, save data for next overlapping FPMATH
1614 
1615  retlen = (blocksize + vc->blocksize[previous_window]) / 4;
1616  for (j = 0; j < vc->audio_channels; j++) {
1617  unsigned bs0 = vc->blocksize[0];
1618  unsigned bs1 = vc->blocksize[1];
1619  float *residue = vc->channel_residues + res_chan[j] * blocksize / 2;
1620  float *saved = vc->saved + j * bs1 / 4;
1621  float *ret = vc->channel_floors + j * retlen;
1622  float *buf = residue;
1623  const float *win = vc->win[blockflag & previous_window];
1624 
1625  if (blockflag == previous_window) {
1626  vc->dsp.vector_fmul_window(ret, saved, buf, win, blocksize / 4);
1627  } else if (blockflag > previous_window) {
1628  vc->dsp.vector_fmul_window(ret, saved, buf, win, bs0 / 4);
1629  memcpy(ret+bs0/2, buf+bs0/4, ((bs1-bs0)/4) * sizeof(float));
1630  } else {
1631  memcpy(ret, saved, ((bs1 - bs0) / 4) * sizeof(float));
1632  vc->dsp.vector_fmul_window(ret + (bs1 - bs0) / 4, saved + (bs1 - bs0) / 4, buf, win, bs0 / 4);
1633  }
1634  memcpy(saved, buf + blocksize / 4, blocksize / 4 * sizeof(float));
1635  }
1636 
1637  vc->previous_window = blockflag;
1638  return retlen;
1639 }
1640 
1641 // Return the decoded audio packet through the standard api
1642 
1643 static int vorbis_decode_frame(AVCodecContext *avccontext, void *data,
1644  int *got_frame_ptr, AVPacket *avpkt)
1645 {
1646  const uint8_t *buf = avpkt->data;
1647  int buf_size = avpkt->size;
1648  vorbis_context *vc = avccontext->priv_data;
1649  GetBitContext *gb = &vc->gb;
1650  const float *channel_ptrs[255];
1651  int i, len, ret;
1652 
1653  av_dlog(NULL, "packet length %d \n", buf_size);
1654 
1655  init_get_bits(gb, buf, buf_size*8);
1656 
1657  if ((len = vorbis_parse_audio_packet(vc)) <= 0)
1658  return len;
1659 
1660  if (!vc->first_frame) {
1661  vc->first_frame = 1;
1662  *got_frame_ptr = 0;
1663  return buf_size;
1664  }
1665 
1666  av_dlog(NULL, "parsed %d bytes %d bits, returned %d samples (*ch*bits) \n",
1667  get_bits_count(gb) / 8, get_bits_count(gb) % 8, len);
1668 
1669  /* get output buffer */
1670  vc->frame.nb_samples = len;
1671  if ((ret = avccontext->get_buffer(avccontext, &vc->frame)) < 0) {
1672  av_log(avccontext, AV_LOG_ERROR, "get_buffer() failed\n");
1673  return ret;
1674  }
1675 
1676  if (vc->audio_channels > 8) {
1677  for (i = 0; i < vc->audio_channels; i++)
1678  channel_ptrs[i] = vc->channel_floors + i * len;
1679  } else {
1680  for (i = 0; i < vc->audio_channels; i++)
1681  channel_ptrs[i] = vc->channel_floors +
1683  }
1684 
1685  if (avccontext->sample_fmt == AV_SAMPLE_FMT_FLT)
1686  vc->fmt_conv.float_interleave((float *)vc->frame.data[0], channel_ptrs,
1687  len, vc->audio_channels);
1688  else
1689  vc->fmt_conv.float_to_int16_interleave((int16_t *)vc->frame.data[0],
1690  channel_ptrs, len,
1691  vc->audio_channels);
1692 
1693  *got_frame_ptr = 1;
1694  *(AVFrame *)data = vc->frame;
1695 
1696  return buf_size;
1697 }
1698 
1699 // Close decoder
1700 
1702 {
1703  vorbis_context *vc = avccontext->priv_data;
1704 
1705  vorbis_free(vc);
1706 
1707  return 0;
1708 }
1709 
1711  .name = "vorbis",
1712  .type = AVMEDIA_TYPE_AUDIO,
1713  .id = CODEC_ID_VORBIS,
1714  .priv_data_size = sizeof(vorbis_context),
1718  .capabilities = CODEC_CAP_DR1,
1719  .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),
1720  .channel_layouts = ff_vorbis_channel_layouts,
1721  .sample_fmts = (const enum AVSampleFormat[]) {
1723  },
1724 };
1725