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vorbisdec.c
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1 /**
2  * @file
3  * Vorbis I decoder
4  * @author Denes Balatoni ( dbalatoni programozo hu )
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 /**
24  * @file
25  * Vorbis I decoder
26  * @author Denes Balatoni ( dbalatoni programozo hu )
27  */
28 
29 #include <inttypes.h>
30 #include <math.h>
31 
32 #define BITSTREAM_READER_LE
33 #include "libavutil/float_dsp.h"
34 #include "libavutil/avassert.h"
35 #include "avcodec.h"
36 #include "get_bits.h"
37 #include "fft.h"
38 #include "internal.h"
39 
40 #include "vorbis.h"
41 #include "vorbisdsp.h"
42 #include "xiph.h"
43 
44 #define V_NB_BITS 8
45 #define V_NB_BITS2 11
46 #define V_MAX_VLCS (1 << 16)
47 #define V_MAX_PARTITIONS (1 << 20)
48 
49 typedef struct vorbis_codebook {
50  uint8_t dimensions;
51  uint8_t lookup_type;
52  uint8_t maxdepth;
53  VLC vlc;
54  float *codevectors;
55  unsigned int nb_bits;
56 } vorbis_codebook;
57 
58 typedef union vorbis_floor_u vorbis_floor_data;
59 typedef struct vorbis_floor0_s vorbis_floor0;
60 typedef struct vorbis_floor1_s vorbis_floor1;
61 struct vorbis_context_s;
62 typedef
63 int (* vorbis_floor_decode_func)
64  (struct vorbis_context_s *, vorbis_floor_data *, float *);
65 typedef struct vorbis_floor {
66  uint8_t floor_type;
67  vorbis_floor_decode_func decode;
68  union vorbis_floor_u {
69  struct vorbis_floor0_s {
70  uint8_t order;
71  uint16_t rate;
72  uint16_t bark_map_size;
73  int32_t *map[2];
74  uint32_t map_size[2];
75  uint8_t amplitude_bits;
76  uint8_t amplitude_offset;
77  uint8_t num_books;
78  uint8_t *book_list;
79  float *lsp;
80  } t0;
81  struct vorbis_floor1_s {
82  uint8_t partitions;
83  uint8_t partition_class[32];
84  uint8_t class_dimensions[16];
85  uint8_t class_subclasses[16];
86  uint8_t class_masterbook[16];
87  int16_t subclass_books[16][8];
88  uint8_t multiplier;
89  uint16_t x_list_dim;
90  vorbis_floor1_entry *list;
91  } t1;
92  } data;
93 } vorbis_floor;
94 
95 typedef struct vorbis_residue {
96  uint16_t type;
97  uint32_t begin;
98  uint32_t end;
99  unsigned partition_size;
100  uint8_t classifications;
101  uint8_t classbook;
102  int16_t books[64][8];
103  uint8_t maxpass;
104  uint16_t ptns_to_read;
105  uint8_t *classifs;
106 } vorbis_residue;
107 
108 typedef struct vorbis_mapping {
109  uint8_t submaps;
110  uint16_t coupling_steps;
111  uint8_t *magnitude;
112  uint8_t *angle;
113  uint8_t *mux;
114  uint8_t submap_floor[16];
115  uint8_t submap_residue[16];
116 } vorbis_mapping;
117 
118 typedef struct vorbis_mode {
119  uint8_t blockflag;
120  uint16_t windowtype;
121  uint16_t transformtype;
122  uint8_t mapping;
123 } vorbis_mode;
124 
125 typedef struct vorbis_context_s {
126  AVCodecContext *avctx;
127  GetBitContext gb;
128  VorbisDSPContext dsp;
129  AVFloatDSPContext *fdsp;
130 
131  FFTContext mdct[2];
132  uint8_t first_frame;
133  uint32_t version;
134  uint8_t audio_channels;
135  uint32_t audio_samplerate;
136  uint32_t bitrate_maximum;
137  uint32_t bitrate_nominal;
138  uint32_t bitrate_minimum;
139  uint32_t blocksize[2];
140  const float *win[2];
141  uint16_t codebook_count;
142  vorbis_codebook *codebooks;
143  uint8_t floor_count;
144  vorbis_floor *floors;
145  uint8_t residue_count;
146  vorbis_residue *residues;
147  uint8_t mapping_count;
148  vorbis_mapping *mappings;
149  uint8_t mode_count;
150  vorbis_mode *modes;
151  uint8_t mode_number; // mode number for the current packet
152  int8_t previous_window;
153  float *channel_residues;
154  float *saved;
155 } vorbis_context;
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->avctx, 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 
192  av_freep(&vc->channel_residues);
193  av_freep(&vc->saved);
194  av_freep(&vc->fdsp);
195 
196  if (vc->residues)
197  for (i = 0; i < vc->residue_count; i++)
198  av_freep(&vc->residues[i].classifs);
199  av_freep(&vc->residues);
200  av_freep(&vc->modes);
201 
202  ff_mdct_end(&vc->mdct[0]);
203  ff_mdct_end(&vc->mdct[1]);
204 
205  if (vc->codebooks)
206  for (i = 0; i < vc->codebook_count; ++i) {
207  av_freep(&vc->codebooks[i].codevectors);
208  ff_free_vlc(&vc->codebooks[i].vlc);
209  }
210  av_freep(&vc->codebooks);
211 
212  if (vc->floors)
213  for (i = 0; i < vc->floor_count; ++i) {
214  if (vc->floors[i].floor_type == 0) {
215  av_freep(&vc->floors[i].data.t0.map[0]);
216  av_freep(&vc->floors[i].data.t0.map[1]);
217  av_freep(&vc->floors[i].data.t0.book_list);
218  av_freep(&vc->floors[i].data.t0.lsp);
219  } else {
220  av_freep(&vc->floors[i].data.t1.list);
221  }
222  }
223  av_freep(&vc->floors);
224 
225  if (vc->mappings)
226  for (i = 0; i < vc->mapping_count; ++i) {
227  av_freep(&vc->mappings[i].magnitude);
228  av_freep(&vc->mappings[i].angle);
229  av_freep(&vc->mappings[i].mux);
230  }
231  av_freep(&vc->mappings);
232 }
233 
234 // Parse setup header -------------------------------------------------
235 
236 // Process codebooks part
237 
238 static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc)
239 {
240  unsigned cb;
241  uint8_t *tmp_vlc_bits = NULL;
242  uint32_t *tmp_vlc_codes = NULL;
243  GetBitContext *gb = &vc->gb;
244  uint16_t *codebook_multiplicands = NULL;
245  int ret = 0;
246 
247  vc->codebook_count = get_bits(gb, 8) + 1;
248 
249  av_dlog(NULL, " Codebooks: %d \n", vc->codebook_count);
250 
251  vc->codebooks = av_mallocz(vc->codebook_count * sizeof(*vc->codebooks));
252  tmp_vlc_bits = av_mallocz(V_MAX_VLCS * sizeof(*tmp_vlc_bits));
253  tmp_vlc_codes = av_mallocz(V_MAX_VLCS * sizeof(*tmp_vlc_codes));
254  codebook_multiplicands = av_malloc(V_MAX_VLCS * sizeof(*codebook_multiplicands));
255  if (!vc->codebooks ||
256  !tmp_vlc_bits || !tmp_vlc_codes || !codebook_multiplicands) {
257  ret = AVERROR(ENOMEM);
258  goto error;
259  }
260 
261  for (cb = 0; cb < vc->codebook_count; ++cb) {
262  vorbis_codebook *codebook_setup = &vc->codebooks[cb];
263  unsigned ordered, t, entries, used_entries = 0;
264 
265  av_dlog(NULL, " %u. Codebook\n", cb);
266 
267  if (get_bits(gb, 24) != 0x564342) {
268  av_log(vc->avctx, AV_LOG_ERROR,
269  " %u. Codebook setup data corrupt.\n", cb);
270  ret = AVERROR_INVALIDDATA;
271  goto error;
272  }
273 
274  codebook_setup->dimensions=get_bits(gb, 16);
275  if (codebook_setup->dimensions > 16 || codebook_setup->dimensions == 0) {
276  av_log(vc->avctx, AV_LOG_ERROR,
277  " %u. Codebook's dimension is invalid (%d).\n",
278  cb, codebook_setup->dimensions);
279  ret = AVERROR_INVALIDDATA;
280  goto error;
281  }
282  entries = get_bits(gb, 24);
283  if (entries > V_MAX_VLCS) {
284  av_log(vc->avctx, AV_LOG_ERROR,
285  " %u. Codebook has too many entries (%u).\n",
286  cb, entries);
287  ret = AVERROR_INVALIDDATA;
288  goto error;
289  }
290 
291  ordered = get_bits1(gb);
292 
293  av_dlog(NULL, " codebook_dimensions %d, codebook_entries %u\n",
294  codebook_setup->dimensions, entries);
295 
296  if (!ordered) {
297  unsigned ce, flag;
298  unsigned sparse = get_bits1(gb);
299 
300  av_dlog(NULL, " not ordered \n");
301 
302  if (sparse) {
303  av_dlog(NULL, " sparse \n");
304 
305  used_entries = 0;
306  for (ce = 0; ce < entries; ++ce) {
307  flag = get_bits1(gb);
308  if (flag) {
309  tmp_vlc_bits[ce] = get_bits(gb, 5) + 1;
310  ++used_entries;
311  } else
312  tmp_vlc_bits[ce] = 0;
313  }
314  } else {
315  av_dlog(NULL, " not sparse \n");
316 
317  used_entries = entries;
318  for (ce = 0; ce < entries; ++ce)
319  tmp_vlc_bits[ce] = get_bits(gb, 5) + 1;
320  }
321  } else {
322  unsigned current_entry = 0;
323  unsigned current_length = get_bits(gb, 5) + 1;
324 
325  av_dlog(NULL, " ordered, current length: %u\n", current_length); //FIXME
326 
327  used_entries = entries;
328  for (; current_entry < used_entries && current_length <= 32; ++current_length) {
329  unsigned i, number;
330 
331  av_dlog(NULL, " number bits: %u ", ilog(entries - current_entry));
332 
333  number = get_bits(gb, ilog(entries - current_entry));
334 
335  av_dlog(NULL, " number: %u\n", number);
336 
337  for (i = current_entry; i < number+current_entry; ++i)
338  if (i < used_entries)
339  tmp_vlc_bits[i] = current_length;
340 
341  current_entry+=number;
342  }
343  if (current_entry>used_entries) {
344  av_log(vc->avctx, AV_LOG_ERROR, " More codelengths than codes in codebook. \n");
345  ret = AVERROR_INVALIDDATA;
346  goto error;
347  }
348  }
349 
350  codebook_setup->lookup_type = get_bits(gb, 4);
351 
352  av_dlog(NULL, " lookup type: %d : %s \n", codebook_setup->lookup_type,
353  codebook_setup->lookup_type ? "vq" : "no lookup");
354 
355 // If the codebook is used for (inverse) VQ, calculate codevectors.
356 
357  if (codebook_setup->lookup_type == 1) {
358  unsigned i, j, k;
359  unsigned codebook_lookup_values = ff_vorbis_nth_root(entries, codebook_setup->dimensions);
360 
361  float codebook_minimum_value = vorbisfloat2float(get_bits_long(gb, 32));
362  float codebook_delta_value = vorbisfloat2float(get_bits_long(gb, 32));
363  unsigned codebook_value_bits = get_bits(gb, 4) + 1;
364  unsigned codebook_sequence_p = get_bits1(gb);
365 
366  av_dlog(NULL, " We expect %d numbers for building the codevectors. \n",
367  codebook_lookup_values);
368  av_dlog(NULL, " delta %f minmum %f \n",
369  codebook_delta_value, codebook_minimum_value);
370 
371  for (i = 0; i < codebook_lookup_values; ++i) {
372  codebook_multiplicands[i] = get_bits(gb, codebook_value_bits);
373 
374  av_dlog(NULL, " multiplicands*delta+minmum : %e \n",
375  (float)codebook_multiplicands[i] * codebook_delta_value + codebook_minimum_value);
376  av_dlog(NULL, " multiplicand %u\n", codebook_multiplicands[i]);
377  }
378 
379 // Weed out unused vlcs and build codevector vector
380  if (used_entries) {
381  codebook_setup->codevectors =
382  av_mallocz_array(used_entries, codebook_setup->dimensions *
383  sizeof(*codebook_setup->codevectors));
384  if (!codebook_setup->codevectors) {
385  ret = AVERROR(ENOMEM);
386  goto error;
387  }
388  } else
389  codebook_setup->codevectors = NULL;
390 
391  for (j = 0, i = 0; i < entries; ++i) {
392  unsigned dim = codebook_setup->dimensions;
393 
394  if (tmp_vlc_bits[i]) {
395  float last = 0.0;
396  unsigned lookup_offset = i;
397 
398  av_dlog(vc->avctx, "Lookup offset %u ,", i);
399 
400  for (k = 0; k < dim; ++k) {
401  unsigned multiplicand_offset = lookup_offset % codebook_lookup_values;
402  codebook_setup->codevectors[j * dim + k] = codebook_multiplicands[multiplicand_offset] * codebook_delta_value + codebook_minimum_value + last;
403  if (codebook_sequence_p)
404  last = codebook_setup->codevectors[j * dim + k];
405  lookup_offset/=codebook_lookup_values;
406  }
407  tmp_vlc_bits[j] = tmp_vlc_bits[i];
408 
409  av_dlog(vc->avctx, "real lookup offset %u, vector: ", j);
410  for (k = 0; k < dim; ++k)
411  av_dlog(vc->avctx, " %f ",
412  codebook_setup->codevectors[j * dim + k]);
413  av_dlog(vc->avctx, "\n");
414 
415  ++j;
416  }
417  }
418  if (j != used_entries) {
419  av_log(vc->avctx, AV_LOG_ERROR, "Bug in codevector vector building code. \n");
420  ret = AVERROR_INVALIDDATA;
421  goto error;
422  }
423  entries = used_entries;
424  } else if (codebook_setup->lookup_type >= 2) {
425  av_log(vc->avctx, AV_LOG_ERROR, "Codebook lookup type not supported. \n");
426  ret = AVERROR_INVALIDDATA;
427  goto error;
428  }
429 
430 // Initialize VLC table
431  if (ff_vorbis_len2vlc(tmp_vlc_bits, tmp_vlc_codes, entries)) {
432  av_log(vc->avctx, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");
433  ret = AVERROR_INVALIDDATA;
434  goto error;
435  }
436  codebook_setup->maxdepth = 0;
437  for (t = 0; t < entries; ++t)
438  if (tmp_vlc_bits[t] >= codebook_setup->maxdepth)
439  codebook_setup->maxdepth = tmp_vlc_bits[t];
440 
441  if (codebook_setup->maxdepth > 3 * V_NB_BITS)
442  codebook_setup->nb_bits = V_NB_BITS2;
443  else
444  codebook_setup->nb_bits = V_NB_BITS;
445 
446  codebook_setup->maxdepth = (codebook_setup->maxdepth+codebook_setup->nb_bits - 1) / codebook_setup->nb_bits;
447 
448  if ((ret = init_vlc(&codebook_setup->vlc, codebook_setup->nb_bits,
449  entries, tmp_vlc_bits, sizeof(*tmp_vlc_bits),
450  sizeof(*tmp_vlc_bits), tmp_vlc_codes,
451  sizeof(*tmp_vlc_codes), sizeof(*tmp_vlc_codes),
452  INIT_VLC_LE))) {
453  av_log(vc->avctx, AV_LOG_ERROR, " Error generating vlc tables. \n");
454  goto error;
455  }
456  }
457 
458  av_free(tmp_vlc_bits);
459  av_free(tmp_vlc_codes);
460  av_free(codebook_multiplicands);
461  return 0;
462 
463 // Error:
464 error:
465  av_free(tmp_vlc_bits);
466  av_free(tmp_vlc_codes);
467  av_free(codebook_multiplicands);
468  return ret;
469 }
470 
471 // Process time domain transforms part (unused in Vorbis I)
472 
473 static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc)
474 {
475  GetBitContext *gb = &vc->gb;
476  unsigned i, vorbis_time_count = get_bits(gb, 6) + 1;
477 
478  for (i = 0; i < vorbis_time_count; ++i) {
479  unsigned vorbis_tdtransform = get_bits(gb, 16);
480 
481  av_dlog(NULL, " Vorbis time domain transform %u: %u\n",
482  vorbis_time_count, vorbis_tdtransform);
483 
484  if (vorbis_tdtransform) {
485  av_log(vc->avctx, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n");
486  return AVERROR_INVALIDDATA;
487  }
488  }
489  return 0;
490 }
491 
492 // Process floors part
493 
494 static int vorbis_floor0_decode(vorbis_context *vc,
495  vorbis_floor_data *vfu, float *vec);
496 static int create_map(vorbis_context *vc, unsigned floor_number);
497 static int vorbis_floor1_decode(vorbis_context *vc,
498  vorbis_floor_data *vfu, float *vec);
499 static int vorbis_parse_setup_hdr_floors(vorbis_context *vc)
500 {
501  GetBitContext *gb = &vc->gb;
502  int i, j, k, ret;
503 
504  vc->floor_count = get_bits(gb, 6) + 1;
505 
506  vc->floors = av_mallocz(vc->floor_count * sizeof(*vc->floors));
507  if (!vc->floors)
508  return AVERROR(ENOMEM);
509 
510  for (i = 0; i < vc->floor_count; ++i) {
511  vorbis_floor *floor_setup = &vc->floors[i];
512 
513  floor_setup->floor_type = get_bits(gb, 16);
514 
515  av_dlog(NULL, " %d. floor type %d \n", i, floor_setup->floor_type);
516 
517  if (floor_setup->floor_type == 1) {
518  int maximum_class = -1;
519  unsigned rangebits, rangemax, floor1_values = 2;
520 
521  floor_setup->decode = vorbis_floor1_decode;
522 
523  floor_setup->data.t1.partitions = get_bits(gb, 5);
524 
525  av_dlog(NULL, " %d.floor: %d partitions \n",
526  i, floor_setup->data.t1.partitions);
527 
528  for (j = 0; j < floor_setup->data.t1.partitions; ++j) {
529  floor_setup->data.t1.partition_class[j] = get_bits(gb, 4);
530  if (floor_setup->data.t1.partition_class[j] > maximum_class)
531  maximum_class = floor_setup->data.t1.partition_class[j];
532 
533  av_dlog(NULL, " %d. floor %d partition class %d \n",
534  i, j, floor_setup->data.t1.partition_class[j]);
535 
536  }
537 
538  av_dlog(NULL, " maximum class %d \n", maximum_class);
539 
540  for (j = 0; j <= maximum_class; ++j) {
541  floor_setup->data.t1.class_dimensions[j] = get_bits(gb, 3) + 1;
542  floor_setup->data.t1.class_subclasses[j] = get_bits(gb, 2);
543 
544  av_dlog(NULL, " %d floor %d class dim: %d subclasses %d \n", i, j,
545  floor_setup->data.t1.class_dimensions[j],
546  floor_setup->data.t1.class_subclasses[j]);
547 
548  if (floor_setup->data.t1.class_subclasses[j]) {
549  GET_VALIDATED_INDEX(floor_setup->data.t1.class_masterbook[j], 8, vc->codebook_count)
550 
551  av_dlog(NULL, " masterbook: %d \n", floor_setup->data.t1.class_masterbook[j]);
552  }
553 
554  for (k = 0; k < (1 << floor_setup->data.t1.class_subclasses[j]); ++k) {
555  int16_t bits = get_bits(gb, 8) - 1;
556  if (bits != -1)
557  VALIDATE_INDEX(bits, vc->codebook_count)
558  floor_setup->data.t1.subclass_books[j][k] = bits;
559 
560  av_dlog(NULL, " book %d. : %d \n", k, floor_setup->data.t1.subclass_books[j][k]);
561  }
562  }
563 
564  floor_setup->data.t1.multiplier = get_bits(gb, 2) + 1;
565  floor_setup->data.t1.x_list_dim = 2;
566 
567  for (j = 0; j < floor_setup->data.t1.partitions; ++j)
568  floor_setup->data.t1.x_list_dim+=floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];
569 
570  floor_setup->data.t1.list = av_mallocz_array(floor_setup->data.t1.x_list_dim,
571  sizeof(*floor_setup->data.t1.list));
572  if (!floor_setup->data.t1.list)
573  return AVERROR(ENOMEM);
574 
575  rangebits = get_bits(gb, 4);
576  rangemax = (1 << rangebits);
577  if (rangemax > vc->blocksize[1] / 2) {
578  av_log(vc->avctx, AV_LOG_ERROR,
579  "Floor value is too large for blocksize: %u (%"PRIu32")\n",
580  rangemax, vc->blocksize[1] / 2);
581  return AVERROR_INVALIDDATA;
582  }
583  floor_setup->data.t1.list[0].x = 0;
584  floor_setup->data.t1.list[1].x = rangemax;
585 
586  for (j = 0; j < floor_setup->data.t1.partitions; ++j) {
587  for (k = 0; k < floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]]; ++k, ++floor1_values) {
588  floor_setup->data.t1.list[floor1_values].x = get_bits(gb, rangebits);
589 
590  av_dlog(NULL, " %u. floor1 Y coord. %d\n", floor1_values,
591  floor_setup->data.t1.list[floor1_values].x);
592  }
593  }
594 
595 // Precalculate order of x coordinates - needed for decode
596  if (ff_vorbis_ready_floor1_list(vc->avctx,
597  floor_setup->data.t1.list,
598  floor_setup->data.t1.x_list_dim)) {
599  return AVERROR_INVALIDDATA;
600  }
601  } else if (floor_setup->floor_type == 0) {
602  unsigned max_codebook_dim = 0;
603 
604  floor_setup->decode = vorbis_floor0_decode;
605 
606  floor_setup->data.t0.order = get_bits(gb, 8);
607  if (!floor_setup->data.t0.order) {
608  av_log(vc->avctx, AV_LOG_ERROR, "Floor 0 order is 0.\n");
609  return AVERROR_INVALIDDATA;
610  }
611  floor_setup->data.t0.rate = get_bits(gb, 16);
612  if (!floor_setup->data.t0.rate) {
613  av_log(vc->avctx, AV_LOG_ERROR, "Floor 0 rate is 0.\n");
614  return AVERROR_INVALIDDATA;
615  }
616  floor_setup->data.t0.bark_map_size = get_bits(gb, 16);
617  if (!floor_setup->data.t0.bark_map_size) {
618  av_log(vc->avctx, AV_LOG_ERROR,
619  "Floor 0 bark map size is 0.\n");
620  return AVERROR_INVALIDDATA;
621  }
622  floor_setup->data.t0.amplitude_bits = get_bits(gb, 6);
623  floor_setup->data.t0.amplitude_offset = get_bits(gb, 8);
624  floor_setup->data.t0.num_books = get_bits(gb, 4) + 1;
625 
626  /* allocate mem for booklist */
627  floor_setup->data.t0.book_list =
628  av_malloc(floor_setup->data.t0.num_books);
629  if (!floor_setup->data.t0.book_list)
630  return AVERROR(ENOMEM);
631  /* read book indexes */
632  {
633  int idx;
634  unsigned book_idx;
635  for (idx = 0; idx < floor_setup->data.t0.num_books; ++idx) {
636  GET_VALIDATED_INDEX(book_idx, 8, vc->codebook_count)
637  floor_setup->data.t0.book_list[idx] = book_idx;
638  if (vc->codebooks[book_idx].dimensions > max_codebook_dim)
639  max_codebook_dim = vc->codebooks[book_idx].dimensions;
640  }
641  }
642 
643  if ((ret = create_map(vc, i)) < 0)
644  return ret;
645 
646  /* codebook dim is for padding if codebook dim doesn't *
647  * divide order+1 then we need to read more data */
648  floor_setup->data.t0.lsp =
649  av_malloc_array((floor_setup->data.t0.order + 1 + max_codebook_dim),
650  sizeof(*floor_setup->data.t0.lsp));
651  if (!floor_setup->data.t0.lsp)
652  return AVERROR(ENOMEM);
653 
654  /* debug output parsed headers */
655  av_dlog(NULL, "floor0 order: %u\n", floor_setup->data.t0.order);
656  av_dlog(NULL, "floor0 rate: %u\n", floor_setup->data.t0.rate);
657  av_dlog(NULL, "floor0 bark map size: %u\n",
658  floor_setup->data.t0.bark_map_size);
659  av_dlog(NULL, "floor0 amplitude bits: %u\n",
660  floor_setup->data.t0.amplitude_bits);
661  av_dlog(NULL, "floor0 amplitude offset: %u\n",
662  floor_setup->data.t0.amplitude_offset);
663  av_dlog(NULL, "floor0 number of books: %u\n",
664  floor_setup->data.t0.num_books);
665  av_dlog(NULL, "floor0 book list pointer: %p\n",
666  floor_setup->data.t0.book_list);
667  {
668  int idx;
669  for (idx = 0; idx < floor_setup->data.t0.num_books; ++idx) {
670  av_dlog(NULL, " Book %d: %u\n", idx + 1,
671  floor_setup->data.t0.book_list[idx]);
672  }
673  }
674  } else {
675  av_log(vc->avctx, AV_LOG_ERROR, "Invalid floor type!\n");
676  return AVERROR_INVALIDDATA;
677  }
678  }
679  return 0;
680 }
681 
682 // Process residues part
683 
684 static int vorbis_parse_setup_hdr_residues(vorbis_context *vc)
685 {
686  GetBitContext *gb = &vc->gb;
687  unsigned i, j, k;
688 
689  vc->residue_count = get_bits(gb, 6)+1;
690  vc->residues = av_mallocz(vc->residue_count * sizeof(*vc->residues));
691  if (!vc->residues)
692  return AVERROR(ENOMEM);
693 
694  av_dlog(NULL, " There are %d residues. \n", vc->residue_count);
695 
696  for (i = 0; i < vc->residue_count; ++i) {
697  vorbis_residue *res_setup = &vc->residues[i];
698  uint8_t cascade[64];
699  unsigned high_bits, low_bits;
700 
701  res_setup->type = get_bits(gb, 16);
702 
703  av_dlog(NULL, " %u. residue type %d\n", i, res_setup->type);
704 
705  res_setup->begin = get_bits(gb, 24);
706  res_setup->end = get_bits(gb, 24);
707  res_setup->partition_size = get_bits(gb, 24) + 1;
708  /* Validations to prevent a buffer overflow later. */
709  if (res_setup->begin>res_setup->end ||
710  (res_setup->end-res_setup->begin) / res_setup->partition_size > FFMIN(V_MAX_PARTITIONS, 65535)) {
711  av_log(vc->avctx, AV_LOG_ERROR,
712  "partition out of bounds: type, begin, end, size, blocksize: %"PRIu16", %"PRIu32", %"PRIu32", %u, %"PRIu32"\n",
713  res_setup->type, res_setup->begin, res_setup->end,
714  res_setup->partition_size, vc->blocksize[1] / 2);
715  return AVERROR_INVALIDDATA;
716  }
717 
718  res_setup->classifications = get_bits(gb, 6) + 1;
719  GET_VALIDATED_INDEX(res_setup->classbook, 8, vc->codebook_count)
720 
721  res_setup->ptns_to_read =
722  (res_setup->end - res_setup->begin) / res_setup->partition_size;
723  res_setup->classifs = av_malloc_array(res_setup->ptns_to_read,
724  vc->audio_channels *
725  sizeof(*res_setup->classifs));
726  if (!res_setup->classifs)
727  return AVERROR(ENOMEM);
728 
729  av_dlog(NULL, " begin %d end %d part.size %d classif.s %d classbook %d \n",
730  res_setup->begin, res_setup->end, res_setup->partition_size,
731  res_setup->classifications, res_setup->classbook);
732 
733  for (j = 0; j < res_setup->classifications; ++j) {
734  high_bits = 0;
735  low_bits = get_bits(gb, 3);
736  if (get_bits1(gb))
737  high_bits = get_bits(gb, 5);
738  cascade[j] = (high_bits << 3) + low_bits;
739 
740  av_dlog(NULL, " %u class cascade depth: %d\n", j, ilog(cascade[j]));
741  }
742 
743  res_setup->maxpass = 0;
744  for (j = 0; j < res_setup->classifications; ++j) {
745  for (k = 0; k < 8; ++k) {
746  if (cascade[j]&(1 << k)) {
747  GET_VALIDATED_INDEX(res_setup->books[j][k], 8, vc->codebook_count)
748 
749  av_dlog(NULL, " %u class cascade depth %u book: %d\n",
750  j, k, res_setup->books[j][k]);
751 
752  if (k>res_setup->maxpass)
753  res_setup->maxpass = k;
754  } else {
755  res_setup->books[j][k] = -1;
756  }
757  }
758  }
759  }
760  return 0;
761 }
762 
763 // Process mappings part
764 
765 static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc)
766 {
767  GetBitContext *gb = &vc->gb;
768  unsigned i, j;
769 
770  vc->mapping_count = get_bits(gb, 6)+1;
771  vc->mappings = av_mallocz(vc->mapping_count * sizeof(*vc->mappings));
772  if (!vc->mappings)
773  return AVERROR(ENOMEM);
774 
775  av_dlog(NULL, " There are %d mappings. \n", vc->mapping_count);
776 
777  for (i = 0; i < vc->mapping_count; ++i) {
778  vorbis_mapping *mapping_setup = &vc->mappings[i];
779 
780  if (get_bits(gb, 16)) {
781  av_log(vc->avctx, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n");
782  return AVERROR_INVALIDDATA;
783  }
784  if (get_bits1(gb)) {
785  mapping_setup->submaps = get_bits(gb, 4) + 1;
786  } else {
787  mapping_setup->submaps = 1;
788  }
789 
790  if (get_bits1(gb)) {
791  mapping_setup->coupling_steps = get_bits(gb, 8) + 1;
792  mapping_setup->magnitude = av_mallocz(mapping_setup->coupling_steps *
793  sizeof(*mapping_setup->magnitude));
794  mapping_setup->angle = av_mallocz(mapping_setup->coupling_steps *
795  sizeof(*mapping_setup->angle));
796  if (!mapping_setup->angle || !mapping_setup->magnitude)
797  return AVERROR(ENOMEM);
798 
799  for (j = 0; j < mapping_setup->coupling_steps; ++j) {
800  GET_VALIDATED_INDEX(mapping_setup->magnitude[j], ilog(vc->audio_channels - 1), vc->audio_channels)
801  GET_VALIDATED_INDEX(mapping_setup->angle[j], ilog(vc->audio_channels - 1), vc->audio_channels)
802  }
803  } else {
804  mapping_setup->coupling_steps = 0;
805  }
806 
807  av_dlog(NULL, " %u mapping coupling steps: %d\n",
808  i, mapping_setup->coupling_steps);
809 
810  if (get_bits(gb, 2)) {
811  av_log(vc->avctx, AV_LOG_ERROR, "%u. mapping setup data invalid.\n", i);
812  return AVERROR_INVALIDDATA; // following spec.
813  }
814 
815  if (mapping_setup->submaps>1) {
816  mapping_setup->mux = av_mallocz_array(vc->audio_channels,
817  sizeof(*mapping_setup->mux));
818  if (!mapping_setup->mux)
819  return AVERROR(ENOMEM);
820 
821  for (j = 0; j < vc->audio_channels; ++j)
822  mapping_setup->mux[j] = get_bits(gb, 4);
823  }
824 
825  for (j = 0; j < mapping_setup->submaps; ++j) {
826  skip_bits(gb, 8); // FIXME check?
827  GET_VALIDATED_INDEX(mapping_setup->submap_floor[j], 8, vc->floor_count)
828  GET_VALIDATED_INDEX(mapping_setup->submap_residue[j], 8, vc->residue_count)
829 
830  av_dlog(NULL, " %u mapping %u submap : floor %d, residue %d\n", i, j,
831  mapping_setup->submap_floor[j],
832  mapping_setup->submap_residue[j]);
833  }
834  }
835  return 0;
836 }
837 
838 // Process modes part
839 
840 static int create_map(vorbis_context *vc, unsigned floor_number)
841 {
842  vorbis_floor *floors = vc->floors;
843  vorbis_floor0 *vf;
844  int idx;
845  int blockflag, n;
846  int32_t *map;
847 
848  for (blockflag = 0; blockflag < 2; ++blockflag) {
849  n = vc->blocksize[blockflag] / 2;
850  floors[floor_number].data.t0.map[blockflag] =
851  av_malloc_array(n + 1, sizeof(int32_t)); // n + sentinel
852  if (!floors[floor_number].data.t0.map[blockflag])
853  return AVERROR(ENOMEM);
854 
855  map = floors[floor_number].data.t0.map[blockflag];
856  vf = &floors[floor_number].data.t0;
857 
858  for (idx = 0; idx < n; ++idx) {
859  map[idx] = floor(BARK((vf->rate * idx) / (2.0f * n)) *
860  (vf->bark_map_size / BARK(vf->rate / 2.0f)));
861  if (vf->bark_map_size-1 < map[idx])
862  map[idx] = vf->bark_map_size - 1;
863  }
864  map[n] = -1;
865  vf->map_size[blockflag] = n;
866  }
867 
868  for (idx = 0; idx <= n; ++idx) {
869  av_dlog(NULL, "floor0 map: map at pos %d is %d\n", idx, map[idx]);
870  }
871 
872  return 0;
873 }
874 
875 static int vorbis_parse_setup_hdr_modes(vorbis_context *vc)
876 {
877  GetBitContext *gb = &vc->gb;
878  unsigned i;
879 
880  vc->mode_count = get_bits(gb, 6) + 1;
881  vc->modes = av_mallocz(vc->mode_count * sizeof(*vc->modes));
882  if (!vc->modes)
883  return AVERROR(ENOMEM);
884 
885  av_dlog(NULL, " There are %d modes.\n", vc->mode_count);
886 
887  for (i = 0; i < vc->mode_count; ++i) {
888  vorbis_mode *mode_setup = &vc->modes[i];
889 
890  mode_setup->blockflag = get_bits1(gb);
891  mode_setup->windowtype = get_bits(gb, 16); //FIXME check
892  mode_setup->transformtype = get_bits(gb, 16); //FIXME check
893  GET_VALIDATED_INDEX(mode_setup->mapping, 8, vc->mapping_count);
894 
895  av_dlog(NULL, " %u mode: blockflag %d, windowtype %d, transformtype %d, mapping %d\n",
896  i, mode_setup->blockflag, mode_setup->windowtype,
897  mode_setup->transformtype, mode_setup->mapping);
898  }
899  return 0;
900 }
901 
902 // Process the whole setup header using the functions above
903 
904 static int vorbis_parse_setup_hdr(vorbis_context *vc)
905 {
906  GetBitContext *gb = &vc->gb;
907  int ret;
908 
909  if ((get_bits(gb, 8) != 'v') || (get_bits(gb, 8) != 'o') ||
910  (get_bits(gb, 8) != 'r') || (get_bits(gb, 8) != 'b') ||
911  (get_bits(gb, 8) != 'i') || (get_bits(gb, 8) != 's')) {
912  av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n");
913  return AVERROR_INVALIDDATA;
914  }
915 
916  if ((ret = vorbis_parse_setup_hdr_codebooks(vc))) {
917  av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n");
918  return ret;
919  }
920  if ((ret = vorbis_parse_setup_hdr_tdtransforms(vc))) {
921  av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n");
922  return ret;
923  }
924  if ((ret = vorbis_parse_setup_hdr_floors(vc))) {
925  av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n");
926  return ret;
927  }
928  if ((ret = vorbis_parse_setup_hdr_residues(vc))) {
929  av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n");
930  return ret;
931  }
932  if ((ret = vorbis_parse_setup_hdr_mappings(vc))) {
933  av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n");
934  return ret;
935  }
936  if ((ret = vorbis_parse_setup_hdr_modes(vc))) {
937  av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n");
938  return ret;
939  }
940  if (!get_bits1(gb)) {
941  av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n");
942  return AVERROR_INVALIDDATA; // framing flag bit unset error
943  }
944 
945  return 0;
946 }
947 
948 // Process the identification header
949 
950 static int vorbis_parse_id_hdr(vorbis_context *vc)
951 {
952  GetBitContext *gb = &vc->gb;
953  unsigned bl0, bl1;
954 
955  if ((get_bits(gb, 8) != 'v') || (get_bits(gb, 8) != 'o') ||
956  (get_bits(gb, 8) != 'r') || (get_bits(gb, 8) != 'b') ||
957  (get_bits(gb, 8) != 'i') || (get_bits(gb, 8) != 's')) {
958  av_log(vc->avctx, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n");
959  return AVERROR_INVALIDDATA;
960  }
961 
962  vc->version = get_bits_long(gb, 32); //FIXME check 0
963  vc->audio_channels = get_bits(gb, 8);
964  if (vc->audio_channels <= 0) {
965  av_log(vc->avctx, AV_LOG_ERROR, "Invalid number of channels\n");
966  return AVERROR_INVALIDDATA;
967  }
968  vc->audio_samplerate = get_bits_long(gb, 32);
969  if (vc->audio_samplerate <= 0) {
970  av_log(vc->avctx, AV_LOG_ERROR, "Invalid samplerate\n");
971  return AVERROR_INVALIDDATA;
972  }
973  vc->bitrate_maximum = get_bits_long(gb, 32);
974  vc->bitrate_nominal = get_bits_long(gb, 32);
975  vc->bitrate_minimum = get_bits_long(gb, 32);
976  bl0 = get_bits(gb, 4);
977  bl1 = get_bits(gb, 4);
978  if (bl0 > 13 || bl0 < 6 || bl1 > 13 || bl1 < 6 || bl1 < bl0) {
979  av_log(vc->avctx, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n");
980  return AVERROR_INVALIDDATA;
981  }
982  vc->blocksize[0] = (1 << bl0);
983  vc->blocksize[1] = (1 << bl1);
984  vc->win[0] = ff_vorbis_vwin[bl0 - 6];
985  vc->win[1] = ff_vorbis_vwin[bl1 - 6];
986 
987  if ((get_bits1(gb)) == 0) {
988  av_log(vc->avctx, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n");
989  return AVERROR_INVALIDDATA;
990  }
991 
992  vc->channel_residues = av_malloc_array(vc->blocksize[1] / 2, vc->audio_channels * sizeof(*vc->channel_residues));
993  vc->saved = av_mallocz_array(vc->blocksize[1] / 4, vc->audio_channels * sizeof(*vc->saved));
994  if (!vc->channel_residues || !vc->saved)
995  return AVERROR(ENOMEM);
996 
997  vc->previous_window = -1;
998 
999  ff_mdct_init(&vc->mdct[0], bl0, 1, -1.0);
1000  ff_mdct_init(&vc->mdct[1], bl1, 1, -1.0);
1001  vc->fdsp = avpriv_float_dsp_alloc(vc->avctx->flags & CODEC_FLAG_BITEXACT);
1002  if (!vc->fdsp)
1003  return AVERROR(ENOMEM);
1004 
1005  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 ",
1006  vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize[0], vc->blocksize[1]);
1007 
1008 /*
1009  BLK = vc->blocksize[0];
1010  for (i = 0; i < BLK / 2; ++i) {
1011  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)));
1012  }
1013 */
1014 
1015  return 0;
1016 }
1017 
1018 // Process the extradata using the functions above (identification header, setup header)
1019 
1020 static av_cold int vorbis_decode_init(AVCodecContext *avctx)
1021 {
1022  vorbis_context *vc = avctx->priv_data;
1023  uint8_t *headers = avctx->extradata;
1024  int headers_len = avctx->extradata_size;
1025  const uint8_t *header_start[3];
1026  int header_len[3];
1027  GetBitContext *gb = &vc->gb;
1028  int hdr_type, ret;
1029 
1030  vc->avctx = avctx;
1031  ff_vorbisdsp_init(&vc->dsp);
1032 
1033  avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
1034 
1035  if (!headers_len) {
1036  av_log(avctx, AV_LOG_ERROR, "Extradata missing.\n");
1037  return AVERROR_INVALIDDATA;
1038  }
1039 
1040  if ((ret = avpriv_split_xiph_headers(headers, headers_len, 30, header_start, header_len)) < 0) {
1041  av_log(avctx, AV_LOG_ERROR, "Extradata corrupt.\n");
1042  return ret;
1043  }
1044 
1045  init_get_bits(gb, header_start[0], header_len[0]*8);
1046  hdr_type = get_bits(gb, 8);
1047  if (hdr_type != 1) {
1048  av_log(avctx, AV_LOG_ERROR, "First header is not the id header.\n");
1049  return AVERROR_INVALIDDATA;
1050  }
1051  if ((ret = vorbis_parse_id_hdr(vc))) {
1052  av_log(avctx, AV_LOG_ERROR, "Id header corrupt.\n");
1053  vorbis_free(vc);
1054  return ret;
1055  }
1056 
1057  init_get_bits(gb, header_start[2], header_len[2]*8);
1058  hdr_type = get_bits(gb, 8);
1059  if (hdr_type != 5) {
1060  av_log(avctx, AV_LOG_ERROR, "Third header is not the setup header.\n");
1061  vorbis_free(vc);
1062  return AVERROR_INVALIDDATA;
1063  }
1064  if ((ret = vorbis_parse_setup_hdr(vc))) {
1065  av_log(avctx, AV_LOG_ERROR, "Setup header corrupt.\n");
1066  vorbis_free(vc);
1067  return ret;
1068  }
1069 
1070  if (vc->audio_channels > 8)
1071  avctx->channel_layout = 0;
1072  else
1073  avctx->channel_layout = ff_vorbis_channel_layouts[vc->audio_channels - 1];
1074 
1075  avctx->channels = vc->audio_channels;
1076  avctx->sample_rate = vc->audio_samplerate;
1077 
1078  return 0;
1079 }
1080 
1081 // Decode audiopackets -------------------------------------------------
1082 
1083 // Read and decode floor
1084 
1085 static int vorbis_floor0_decode(vorbis_context *vc,
1086  vorbis_floor_data *vfu, float *vec)
1087 {
1088  vorbis_floor0 *vf = &vfu->t0;
1089  float *lsp = vf->lsp;
1090  unsigned amplitude, book_idx;
1091  unsigned blockflag = vc->modes[vc->mode_number].blockflag;
1092 
1093  if (!vf->amplitude_bits)
1094  return 1;
1095 
1096  amplitude = get_bits(&vc->gb, vf->amplitude_bits);
1097  if (amplitude > 0) {
1098  float last = 0;
1099  unsigned idx, lsp_len = 0;
1100  vorbis_codebook codebook;
1101 
1102  book_idx = get_bits(&vc->gb, ilog(vf->num_books));
1103  if (book_idx >= vf->num_books) {
1104  av_log(vc->avctx, AV_LOG_ERROR, "floor0 dec: booknumber too high!\n");
1105  book_idx = 0;
1106  }
1107  av_dlog(NULL, "floor0 dec: booknumber: %u\n", book_idx);
1108  codebook = vc->codebooks[vf->book_list[book_idx]];
1109  /* Invalid codebook! */
1110  if (!codebook.codevectors)
1111  return AVERROR_INVALIDDATA;
1112 
1113  while (lsp_len<vf->order) {
1114  int vec_off;
1115 
1116  av_dlog(NULL, "floor0 dec: book dimension: %d\n", codebook.dimensions);
1117  av_dlog(NULL, "floor0 dec: maximum depth: %d\n", codebook.maxdepth);
1118  /* read temp vector */
1119  vec_off = get_vlc2(&vc->gb, codebook.vlc.table,
1120  codebook.nb_bits, codebook.maxdepth)
1121  * codebook.dimensions;
1122  av_dlog(NULL, "floor0 dec: vector offset: %d\n", vec_off);
1123  /* copy each vector component and add last to it */
1124  for (idx = 0; idx < codebook.dimensions; ++idx)
1125  lsp[lsp_len+idx] = codebook.codevectors[vec_off+idx] + last;
1126  last = lsp[lsp_len+idx-1]; /* set last to last vector component */
1127 
1128  lsp_len += codebook.dimensions;
1129  }
1130  /* DEBUG: output lsp coeffs */
1131  {
1132  int idx;
1133  for (idx = 0; idx < lsp_len; ++idx)
1134  av_dlog(NULL, "floor0 dec: coeff at %d is %f\n", idx, lsp[idx]);
1135  }
1136 
1137  /* synthesize floor output vector */
1138  {
1139  int i;
1140  int order = vf->order;
1141  float wstep = M_PI / vf->bark_map_size;
1142 
1143  for (i = 0; i < order; i++)
1144  lsp[i] = 2.0f * cos(lsp[i]);
1145 
1146  av_dlog(NULL, "floor0 synth: map_size = %"PRIu32"; m = %d; wstep = %f\n",
1147  vf->map_size[blockflag], order, wstep);
1148 
1149  i = 0;
1150  while (i < vf->map_size[blockflag]) {
1151  int j, iter_cond = vf->map[blockflag][i];
1152  float p = 0.5f;
1153  float q = 0.5f;
1154  float two_cos_w = 2.0f * cos(wstep * iter_cond); // needed all times
1155 
1156  /* similar part for the q and p products */
1157  for (j = 0; j + 1 < order; j += 2) {
1158  q *= lsp[j] - two_cos_w;
1159  p *= lsp[j + 1] - two_cos_w;
1160  }
1161  if (j == order) { // even order
1162  p *= p * (2.0f - two_cos_w);
1163  q *= q * (2.0f + two_cos_w);
1164  } else { // odd order
1165  q *= two_cos_w-lsp[j]; // one more time for q
1166 
1167  /* final step and square */
1168  p *= p * (4.f - two_cos_w * two_cos_w);
1169  q *= q;
1170  }
1171 
1172  /* calculate linear floor value */
1173  q = exp((((amplitude*vf->amplitude_offset) /
1174  (((1 << vf->amplitude_bits) - 1) * sqrt(p + q)))
1175  - vf->amplitude_offset) * .11512925f);
1176 
1177  /* fill vector */
1178  do {
1179  vec[i] = q; ++i;
1180  } while (vf->map[blockflag][i] == iter_cond);
1181  }
1182  }
1183  } else {
1184  /* this channel is unused */
1185  return 1;
1186  }
1187 
1188  av_dlog(NULL, " Floor0 decoded\n");
1189 
1190  return 0;
1191 }
1192 
1193 static int vorbis_floor1_decode(vorbis_context *vc,
1194  vorbis_floor_data *vfu, float *vec)
1195 {
1196  vorbis_floor1 *vf = &vfu->t1;
1197  GetBitContext *gb = &vc->gb;
1198  uint16_t range_v[4] = { 256, 128, 86, 64 };
1199  unsigned range = range_v[vf->multiplier - 1];
1200  uint16_t floor1_Y[258];
1201  uint16_t floor1_Y_final[258];
1202  int floor1_flag[258];
1203  unsigned partition_class, cdim, cbits, csub, cval, offset, i, j;
1204  int book, adx, ady, dy, off, predicted, err;
1205 
1206 
1207  if (!get_bits1(gb)) // silence
1208  return 1;
1209 
1210 // Read values (or differences) for the floor's points
1211 
1212  floor1_Y[0] = get_bits(gb, ilog(range - 1));
1213  floor1_Y[1] = get_bits(gb, ilog(range - 1));
1214 
1215  av_dlog(NULL, "floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);
1216 
1217  offset = 2;
1218  for (i = 0; i < vf->partitions; ++i) {
1219  partition_class = vf->partition_class[i];
1220  cdim = vf->class_dimensions[partition_class];
1221  cbits = vf->class_subclasses[partition_class];
1222  csub = (1 << cbits) - 1;
1223  cval = 0;
1224 
1225  av_dlog(NULL, "Cbits %u\n", cbits);
1226 
1227  if (cbits) // this reads all subclasses for this partition's class
1228  cval = get_vlc2(gb, vc->codebooks[vf->class_masterbook[partition_class]].vlc.table,
1229  vc->codebooks[vf->class_masterbook[partition_class]].nb_bits, 3);
1230 
1231  for (j = 0; j < cdim; ++j) {
1232  book = vf->subclass_books[partition_class][cval & csub];
1233 
1234  av_dlog(NULL, "book %d Cbits %u cval %u bits:%d\n",
1235  book, cbits, cval, get_bits_count(gb));
1236 
1237  cval = cval >> cbits;
1238  if (book > -1) {
1239  int v = get_vlc2(gb, vc->codebooks[book].vlc.table,
1240  vc->codebooks[book].nb_bits, 3);
1241  if (v < 0)
1242  return AVERROR_INVALIDDATA;
1243  floor1_Y[offset+j] = v;
1244  } else {
1245  floor1_Y[offset+j] = 0;
1246  }
1247 
1248  av_dlog(NULL, " floor(%d) = %d \n",
1249  vf->list[offset+j].x, floor1_Y[offset+j]);
1250  }
1251  offset+=cdim;
1252  }
1253 
1254 // Amplitude calculation from the differences
1255 
1256  floor1_flag[0] = 1;
1257  floor1_flag[1] = 1;
1258  floor1_Y_final[0] = floor1_Y[0];
1259  floor1_Y_final[1] = floor1_Y[1];
1260 
1261  for (i = 2; i < vf->x_list_dim; ++i) {
1262  unsigned val, highroom, lowroom, room, high_neigh_offs, low_neigh_offs;
1263 
1264  low_neigh_offs = vf->list[i].low;
1265  high_neigh_offs = vf->list[i].high;
1266  dy = floor1_Y_final[high_neigh_offs] - floor1_Y_final[low_neigh_offs]; // render_point begin
1267  adx = vf->list[high_neigh_offs].x - vf->list[low_neigh_offs].x;
1268  ady = FFABS(dy);
1269  err = ady * (vf->list[i].x - vf->list[low_neigh_offs].x);
1270  off = err / adx;
1271  if (dy < 0) {
1272  predicted = floor1_Y_final[low_neigh_offs] - off;
1273  } else {
1274  predicted = floor1_Y_final[low_neigh_offs] + off;
1275  } // render_point end
1276 
1277  val = floor1_Y[i];
1278  highroom = range-predicted;
1279  lowroom = predicted;
1280  if (highroom < lowroom) {
1281  room = highroom * 2;
1282  } else {
1283  room = lowroom * 2; // SPEC misspelling
1284  }
1285  if (val) {
1286  floor1_flag[low_neigh_offs] = 1;
1287  floor1_flag[high_neigh_offs] = 1;
1288  floor1_flag[i] = 1;
1289  if (val >= room) {
1290  if (highroom > lowroom) {
1291  floor1_Y_final[i] = av_clip_uint16(val - lowroom + predicted);
1292  } else {
1293  floor1_Y_final[i] = av_clip_uint16(predicted - val + highroom - 1);
1294  }
1295  } else {
1296  if (val & 1) {
1297  floor1_Y_final[i] = av_clip_uint16(predicted - (val + 1) / 2);
1298  } else {
1299  floor1_Y_final[i] = av_clip_uint16(predicted + val / 2);
1300  }
1301  }
1302  } else {
1303  floor1_flag[i] = 0;
1304  floor1_Y_final[i] = av_clip_uint16(predicted);
1305  }
1306 
1307  av_dlog(NULL, " Decoded floor(%d) = %u / val %u\n",
1308  vf->list[i].x, floor1_Y_final[i], val);
1309  }
1310 
1311 // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?
1312 
1313  ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);
1314 
1315  av_dlog(NULL, " Floor decoded\n");
1316 
1317  return 0;
1318 }
1319 
1320 static av_always_inline int setup_classifs(vorbis_context *vc,
1321  vorbis_residue *vr,
1322  uint8_t *do_not_decode,
1323  unsigned ch_used,
1324  int partition_count,
1325  int ptns_to_read
1326  )
1327 {
1328  int p, j, i;
1329  unsigned c_p_c = vc->codebooks[vr->classbook].dimensions;
1330  unsigned inverse_class = ff_inverse[vr->classifications];
1331  unsigned temp, temp2;
1332  for (p = 0, j = 0; j < ch_used; ++j) {
1333  if (!do_not_decode[j]) {
1334  temp = get_vlc2(&vc->gb, vc->codebooks[vr->classbook].vlc.table,
1335  vc->codebooks[vr->classbook].nb_bits, 3);
1336 
1337  av_dlog(NULL, "Classword: %u\n", temp);
1338 
1339  if ((int)temp < 0)
1340  return temp;
1341 
1342  av_assert0(vr->classifications > 1); //needed for inverse[]
1343 
1344  if (temp <= 65536) {
1345  for (i = partition_count + c_p_c - 1; i >= partition_count; i--) {
1346  temp2 = (((uint64_t)temp) * inverse_class) >> 32;
1347 
1348  if (i < ptns_to_read)
1349  vr->classifs[p + i] = temp - temp2 * vr->classifications;
1350  temp = temp2;
1351  }
1352  } else {
1353  for (i = partition_count + c_p_c - 1; i >= partition_count; i--) {
1354  temp2 = temp / vr->classifications;
1355 
1356  if (i < ptns_to_read)
1357  vr->classifs[p + i] = temp - temp2 * vr->classifications;
1358  temp = temp2;
1359  }
1360  }
1361  }
1362  p += ptns_to_read;
1363  }
1364  return 0;
1365 }
1366 // Read and decode residue
1367 
1368 static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc,
1369  vorbis_residue *vr,
1370  unsigned ch,
1371  uint8_t *do_not_decode,
1372  float *vec,
1373  unsigned vlen,
1374  unsigned ch_left,
1375  int vr_type)
1376 {
1377  GetBitContext *gb = &vc->gb;
1378  unsigned c_p_c = vc->codebooks[vr->classbook].dimensions;
1379  uint8_t *classifs = vr->classifs;
1380  unsigned pass, ch_used, i, j, k, l;
1381  unsigned max_output = (ch - 1) * vlen;
1382  int ptns_to_read = vr->ptns_to_read;
1383  int libvorbis_bug = 0;
1384 
1385  if (vr_type == 2) {
1386  for (j = 1; j < ch; ++j)
1387  do_not_decode[0] &= do_not_decode[j]; // FIXME - clobbering input
1388  if (do_not_decode[0])
1389  return 0;
1390  ch_used = 1;
1391  max_output += vr->end / ch;
1392  } else {
1393  ch_used = ch;
1394  max_output += vr->end;
1395  }
1396 
1397  if (max_output > ch_left * vlen) {
1398  if (max_output <= ch_left * vlen + vr->partition_size*ch_used/ch) {
1399  ptns_to_read--;
1400  libvorbis_bug = 1;
1401  } else {
1402  av_log(vc->avctx, AV_LOG_ERROR, "Insufficient output buffer\n");
1403  return AVERROR_INVALIDDATA;
1404  }
1405  }
1406 
1407  av_dlog(NULL, " residue type 0/1/2 decode begin, ch: %d cpc %d \n", ch, c_p_c);
1408 
1409  for (pass = 0; pass <= vr->maxpass; ++pass) { // FIXME OPTIMIZE?
1410  int voffset, partition_count, j_times_ptns_to_read;
1411 
1412  voffset = vr->begin;
1413  for (partition_count = 0; partition_count < ptns_to_read;) { // SPEC error
1414  if (!pass) {
1415  int ret;
1416  if ((ret = setup_classifs(vc, vr, do_not_decode, ch_used, partition_count, ptns_to_read)) < 0)
1417  return ret;
1418  }
1419  for (i = 0; (i < c_p_c) && (partition_count < ptns_to_read); ++i) {
1420  for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {
1421  unsigned voffs;
1422 
1423  if (!do_not_decode[j]) {
1424  unsigned vqclass = classifs[j_times_ptns_to_read + partition_count];
1425  int vqbook = vr->books[vqclass][pass];
1426 
1427  if (vqbook >= 0 && vc->codebooks[vqbook].codevectors) {
1428  unsigned coffs;
1429  unsigned dim = vc->codebooks[vqbook].dimensions;
1430  unsigned step = FASTDIV(vr->partition_size << 1, dim << 1);
1431  vorbis_codebook codebook = vc->codebooks[vqbook];
1432 
1433  if (vr_type == 0) {
1434 
1435  voffs = voffset+j*vlen;
1436  for (k = 0; k < step; ++k) {
1437  coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1438  for (l = 0; l < dim; ++l)
1439  vec[voffs + k + l * step] += codebook.codevectors[coffs + l];
1440  }
1441  } else if (vr_type == 1) {
1442  voffs = voffset + j * vlen;
1443  for (k = 0; k < step; ++k) {
1444  coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1445  for (l = 0; l < dim; ++l, ++voffs) {
1446  vec[voffs]+=codebook.codevectors[coffs+l];
1447 
1448  av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d \n",
1449  pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);
1450  }
1451  }
1452  } else if (vr_type == 2 && ch == 2 && (voffset & 1) == 0 && (dim & 1) == 0) { // most frequent case optimized
1453  voffs = voffset >> 1;
1454 
1455  if (dim == 2) {
1456  for (k = 0; k < step; ++k) {
1457  coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;
1458  vec[voffs + k ] += codebook.codevectors[coffs ];
1459  vec[voffs + k + vlen] += codebook.codevectors[coffs + 1];
1460  }
1461  } else if (dim == 4) {
1462  for (k = 0; k < step; ++k, voffs += 2) {
1463  coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4;
1464  vec[voffs ] += codebook.codevectors[coffs ];
1465  vec[voffs + 1 ] += codebook.codevectors[coffs + 2];
1466  vec[voffs + vlen ] += codebook.codevectors[coffs + 1];
1467  vec[voffs + vlen + 1] += codebook.codevectors[coffs + 3];
1468  }
1469  } else
1470  for (k = 0; k < step; ++k) {
1471  coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1472  for (l = 0; l < dim; l += 2, voffs++) {
1473  vec[voffs ] += codebook.codevectors[coffs + l ];
1474  vec[voffs + vlen] += codebook.codevectors[coffs + l + 1];
1475 
1476  av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d+%d \n",
1477  pass, voffset / ch + (voffs % ch) * vlen,
1478  vec[voffset / ch + (voffs % ch) * vlen],
1479  codebook.codevectors[coffs + l], coffs, l);
1480  }
1481  }
1482 
1483  } else if (vr_type == 2) {
1484  unsigned voffs_div = FASTDIV(voffset << 1, ch <<1);
1485  unsigned voffs_mod = voffset - voffs_div * ch;
1486 
1487  for (k = 0; k < step; ++k) {
1488  coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1489  for (l = 0; l < dim; ++l) {
1490  vec[voffs_div + voffs_mod * vlen] +=
1491  codebook.codevectors[coffs + l];
1492 
1493  av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d+%d \n",
1494  pass, voffs_div + voffs_mod * vlen,
1495  vec[voffs_div + voffs_mod * vlen],
1496  codebook.codevectors[coffs + l], coffs, l);
1497 
1498  if (++voffs_mod == ch) {
1499  voffs_div++;
1500  voffs_mod = 0;
1501  }
1502  }
1503  }
1504  }
1505  }
1506  }
1507  j_times_ptns_to_read += ptns_to_read;
1508  }
1509  ++partition_count;
1510  voffset += vr->partition_size;
1511  }
1512  }
1513  if (libvorbis_bug && !pass) {
1514  for (j = 0; j < ch_used; ++j) {
1515  if (!do_not_decode[j]) {
1516  get_vlc2(&vc->gb, vc->codebooks[vr->classbook].vlc.table,
1517  vc->codebooks[vr->classbook].nb_bits, 3);
1518  }
1519  }
1520  }
1521  }
1522  return 0;
1523 }
1524 
1525 static inline int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr,
1526  unsigned ch,
1527  uint8_t *do_not_decode,
1528  float *vec, unsigned vlen,
1529  unsigned ch_left)
1530 {
1531  if (vr->type == 2)
1532  return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 2);
1533  else if (vr->type == 1)
1534  return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 1);
1535  else if (vr->type == 0)
1536  return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 0);
1537  else {
1538  av_log(vc->avctx, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");
1539  return AVERROR_INVALIDDATA;
1540  }
1541 }
1542 
1543 void ff_vorbis_inverse_coupling(float *mag, float *ang, intptr_t blocksize)
1544 {
1545  int i;
1546  for (i = 0; i < blocksize; i++) {
1547  if (mag[i] > 0.0) {
1548  if (ang[i] > 0.0) {
1549  ang[i] = mag[i] - ang[i];
1550  } else {
1551  float temp = ang[i];
1552  ang[i] = mag[i];
1553  mag[i] += temp;
1554  }
1555  } else {
1556  if (ang[i] > 0.0) {
1557  ang[i] += mag[i];
1558  } else {
1559  float temp = ang[i];
1560  ang[i] = mag[i];
1561  mag[i] -= temp;
1562  }
1563  }
1564  }
1565 }
1566 
1567 // Decode the audio packet using the functions above
1568 
1569 static int vorbis_parse_audio_packet(vorbis_context *vc, float **floor_ptr)
1570 {
1571  GetBitContext *gb = &vc->gb;
1572  FFTContext *mdct;
1573  int previous_window = vc->previous_window;
1574  unsigned mode_number, blockflag, blocksize;
1575  int i, j;
1576  uint8_t no_residue[255];
1577  uint8_t do_not_decode[255];
1578  vorbis_mapping *mapping;
1579  float *ch_res_ptr = vc->channel_residues;
1580  uint8_t res_chan[255];
1581  unsigned res_num = 0;
1582  int retlen = 0;
1583  unsigned ch_left = vc->audio_channels;
1584  unsigned vlen;
1585 
1586  if (get_bits1(gb)) {
1587  av_log(vc->avctx, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");
1588  return AVERROR_INVALIDDATA; // packet type not audio
1589  }
1590 
1591  if (vc->mode_count == 1) {
1592  mode_number = 0;
1593  } else {
1594  GET_VALIDATED_INDEX(mode_number, ilog(vc->mode_count-1), vc->mode_count)
1595  }
1596  vc->mode_number = mode_number;
1597  mapping = &vc->mappings[vc->modes[mode_number].mapping];
1598 
1599  av_dlog(NULL, " Mode number: %u , mapping: %d , blocktype %d\n", mode_number,
1600  vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);
1601 
1602  blockflag = vc->modes[mode_number].blockflag;
1603  blocksize = vc->blocksize[blockflag];
1604  vlen = blocksize / 2;
1605  if (blockflag) {
1606  int code = get_bits(gb, 2);
1607  if (previous_window < 0)
1608  previous_window = code>>1;
1609  } else if (previous_window < 0)
1610  previous_window = 0;
1611 
1612  memset(ch_res_ptr, 0, sizeof(float) * vc->audio_channels * vlen); //FIXME can this be removed ?
1613  for (i = 0; i < vc->audio_channels; ++i)
1614  memset(floor_ptr[i], 0, vlen * sizeof(floor_ptr[0][0])); //FIXME can this be removed ?
1615 
1616 // Decode floor
1617 
1618  for (i = 0; i < vc->audio_channels; ++i) {
1619  vorbis_floor *floor;
1620  int ret;
1621  if (mapping->submaps > 1) {
1622  floor = &vc->floors[mapping->submap_floor[mapping->mux[i]]];
1623  } else {
1624  floor = &vc->floors[mapping->submap_floor[0]];
1625  }
1626 
1627  ret = floor->decode(vc, &floor->data, floor_ptr[i]);
1628 
1629  if (ret < 0) {
1630  av_log(vc->avctx, AV_LOG_ERROR, "Invalid codebook in vorbis_floor_decode.\n");
1631  return AVERROR_INVALIDDATA;
1632  }
1633  no_residue[i] = ret;
1634  }
1635 
1636 // Nonzero vector propagate
1637 
1638  for (i = mapping->coupling_steps - 1; i >= 0; --i) {
1639  if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {
1640  no_residue[mapping->magnitude[i]] = 0;
1641  no_residue[mapping->angle[i]] = 0;
1642  }
1643  }
1644 
1645 // Decode residue
1646 
1647  for (i = 0; i < mapping->submaps; ++i) {
1648  vorbis_residue *residue;
1649  unsigned ch = 0;
1650  int ret;
1651 
1652  for (j = 0; j < vc->audio_channels; ++j) {
1653  if ((mapping->submaps == 1) || (i == mapping->mux[j])) {
1654  res_chan[j] = res_num;
1655  if (no_residue[j]) {
1656  do_not_decode[ch] = 1;
1657  } else {
1658  do_not_decode[ch] = 0;
1659  }
1660  ++ch;
1661  ++res_num;
1662  }
1663  }
1664  residue = &vc->residues[mapping->submap_residue[i]];
1665  if (ch_left < ch) {
1666  av_log(vc->avctx, AV_LOG_ERROR, "Too many channels in vorbis_floor_decode.\n");
1667  return AVERROR_INVALIDDATA;
1668  }
1669  if (ch) {
1670  ret = vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, vlen, ch_left);
1671  if (ret < 0)
1672  return ret;
1673  }
1674 
1675  ch_res_ptr += ch * vlen;
1676  ch_left -= ch;
1677  }
1678 
1679  if (ch_left > 0)
1680  return AVERROR_INVALIDDATA;
1681 
1682 // Inverse coupling
1683 
1684  for (i = mapping->coupling_steps - 1; i >= 0; --i) { //warning: i has to be signed
1685  float *mag, *ang;
1686 
1687  mag = vc->channel_residues+res_chan[mapping->magnitude[i]] * blocksize / 2;
1688  ang = vc->channel_residues+res_chan[mapping->angle[i]] * blocksize / 2;
1689  vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize / 2);
1690  }
1691 
1692 // Dotproduct, MDCT
1693 
1694  mdct = &vc->mdct[blockflag];
1695 
1696  for (j = vc->audio_channels-1;j >= 0; j--) {
1697  ch_res_ptr = vc->channel_residues + res_chan[j] * blocksize / 2;
1698  vc->fdsp->vector_fmul(floor_ptr[j], floor_ptr[j], ch_res_ptr, blocksize / 2);
1699  mdct->imdct_half(mdct, ch_res_ptr, floor_ptr[j]);
1700  }
1701 
1702 // Overlap/add, save data for next overlapping
1703 
1704  retlen = (blocksize + vc->blocksize[previous_window]) / 4;
1705  for (j = 0; j < vc->audio_channels; j++) {
1706  unsigned bs0 = vc->blocksize[0];
1707  unsigned bs1 = vc->blocksize[1];
1708  float *residue = vc->channel_residues + res_chan[j] * blocksize / 2;
1709  float *saved = vc->saved + j * bs1 / 4;
1710  float *ret = floor_ptr[j];
1711  float *buf = residue;
1712  const float *win = vc->win[blockflag & previous_window];
1713 
1714  if (blockflag == previous_window) {
1715  vc->fdsp->vector_fmul_window(ret, saved, buf, win, blocksize / 4);
1716  } else if (blockflag > previous_window) {
1717  vc->fdsp->vector_fmul_window(ret, saved, buf, win, bs0 / 4);
1718  memcpy(ret+bs0/2, buf+bs0/4, ((bs1-bs0)/4) * sizeof(float));
1719  } else {
1720  memcpy(ret, saved, ((bs1 - bs0) / 4) * sizeof(float));
1721  vc->fdsp->vector_fmul_window(ret + (bs1 - bs0) / 4, saved + (bs1 - bs0) / 4, buf, win, bs0 / 4);
1722  }
1723  memcpy(saved, buf + blocksize / 4, blocksize / 4 * sizeof(float));
1724  }
1725 
1726  vc->previous_window = blockflag;
1727  return retlen;
1728 }
1729 
1730 // Return the decoded audio packet through the standard api
1731 
1732 static int vorbis_decode_frame(AVCodecContext *avctx, void *data,
1733  int *got_frame_ptr, AVPacket *avpkt)
1734 {
1735  const uint8_t *buf = avpkt->data;
1736  int buf_size = avpkt->size;
1737  vorbis_context *vc = avctx->priv_data;
1738  AVFrame *frame = data;
1739  GetBitContext *gb = &vc->gb;
1740  float *channel_ptrs[255];
1741  int i, len, ret;
1742 
1743  av_dlog(NULL, "packet length %d \n", buf_size);
1744 
1745  if (*buf == 1 && buf_size > 7) {
1746  init_get_bits(gb, buf+1, buf_size*8 - 8);
1747  vorbis_free(vc);
1748  if ((ret = vorbis_parse_id_hdr(vc))) {
1749  av_log(avctx, AV_LOG_ERROR, "Id header corrupt.\n");
1750  vorbis_free(vc);
1751  return ret;
1752  }
1753 
1754  if (vc->audio_channels > 8)
1755  avctx->channel_layout = 0;
1756  else
1757  avctx->channel_layout = ff_vorbis_channel_layouts[vc->audio_channels - 1];
1758 
1759  avctx->channels = vc->audio_channels;
1760  avctx->sample_rate = vc->audio_samplerate;
1761  return buf_size;
1762  }
1763 
1764  if (*buf == 3 && buf_size > 7) {
1765  av_log(avctx, AV_LOG_DEBUG, "Ignoring comment header\n");
1766  return buf_size;
1767  }
1768 
1769  if (*buf == 5 && buf_size > 7 && vc->channel_residues && !vc->modes) {
1770  init_get_bits(gb, buf+1, buf_size*8 - 8);
1771  if ((ret = vorbis_parse_setup_hdr(vc))) {
1772  av_log(avctx, AV_LOG_ERROR, "Setup header corrupt.\n");
1773  vorbis_free(vc);
1774  return ret;
1775  }
1776  return buf_size;
1777  }
1778 
1779  if (!vc->channel_residues || !vc->modes) {
1780  av_log(avctx, AV_LOG_ERROR, "Data packet before valid headers\n");
1781  return AVERROR_INVALIDDATA;
1782  }
1783 
1784  /* get output buffer */
1785  frame->nb_samples = vc->blocksize[1] / 2;
1786  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
1787  return ret;
1788 
1789  if (vc->audio_channels > 8) {
1790  for (i = 0; i < vc->audio_channels; i++)
1791  channel_ptrs[i] = (float *)frame->extended_data[i];
1792  } else {
1793  for (i = 0; i < vc->audio_channels; i++) {
1794  int ch = ff_vorbis_channel_layout_offsets[vc->audio_channels - 1][i];
1795  channel_ptrs[ch] = (float *)frame->extended_data[i];
1796  }
1797  }
1798 
1799  init_get_bits(gb, buf, buf_size*8);
1800 
1801  if ((len = vorbis_parse_audio_packet(vc, channel_ptrs)) <= 0)
1802  return len;
1803 
1804  if (!vc->first_frame) {
1805  vc->first_frame = 1;
1806  *got_frame_ptr = 0;
1807  av_frame_unref(frame);
1808  return buf_size;
1809  }
1810 
1811  av_dlog(NULL, "parsed %d bytes %d bits, returned %d samples (*ch*bits) \n",
1812  get_bits_count(gb) / 8, get_bits_count(gb) % 8, len);
1813 
1814  frame->nb_samples = len;
1815  *got_frame_ptr = 1;
1816 
1817  return buf_size;
1818 }
1819 
1820 // Close decoder
1821 
1822 static av_cold int vorbis_decode_close(AVCodecContext *avctx)
1823 {
1824  vorbis_context *vc = avctx->priv_data;
1825 
1826  vorbis_free(vc);
1827 
1828  return 0;
1829 }
1830 
1831 static av_cold void vorbis_decode_flush(AVCodecContext *avctx)
1832 {
1833  vorbis_context *vc = avctx->priv_data;
1834 
1835  if (vc->saved) {
1836  memset(vc->saved, 0, (vc->blocksize[1] / 4) * vc->audio_channels *
1837  sizeof(*vc->saved));
1838  }
1839  vc->previous_window = -1;
1840  vc->first_frame = 0;
1841 }
1842 
1843 AVCodec ff_vorbis_decoder = {
1844  .name = "vorbis",
1845  .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),
1846  .type = AVMEDIA_TYPE_AUDIO,
1847  .id = AV_CODEC_ID_VORBIS,
1848  .priv_data_size = sizeof(vorbis_context),
1849  .init = vorbis_decode_init,
1850  .close = vorbis_decode_close,
1851  .decode = vorbis_decode_frame,
1852  .flush = vorbis_decode_flush,
1853  .capabilities = CODEC_CAP_DR1,
1854  .channel_layouts = ff_vorbis_channel_layouts,
1855  .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
1856  AV_SAMPLE_FMT_NONE },
1857 };
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