1 /**
2 * @file
3 * Vorbis I decoder
4 * @author Denes Balatoni ( dbalatoni programozo hu )
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 /**
24 * @file
25 * Vorbis I decoder
26 * @author Denes Balatoni ( dbalatoni programozo hu )
27 */
28
29 #include <inttypes.h>
30 #include <math.h>
31
32 #define BITSTREAM_READER_LE
33 #include "libavutil/float_dsp.h"
34 #include "libavutil/avassert.h"
35 #include "avcodec.h"
36 #include "get_bits.h"
37 #include "fft.h"
38 #include "fmtconvert.h"
39 #include "internal.h"
40
41 #include "vorbis.h"
42 #include "vorbisdsp.h"
43 #include "xiph.h"
44
45 #define V_NB_BITS 8
46 #define V_NB_BITS2 11
47 #define V_MAX_VLCS (1 << 16)
48 #define V_MAX_PARTITIONS (1 << 20)
49
50 typedef struct {
51 uint8_t dimensions;
52 uint8_t lookup_type;
53 uint8_t maxdepth;
54 VLC vlc;
55 float *codevectors;
56 unsigned int nb_bits;
57 } vorbis_codebook;
58
59 typedef union vorbis_floor_u vorbis_floor_data;
60 typedef struct vorbis_floor0_s vorbis_floor0;
61 typedef struct vorbis_floor1_s vorbis_floor1;
62 struct vorbis_context_s;
63 typedef
64 int (* vorbis_floor_decode_func)
65 (struct vorbis_context_s *, vorbis_floor_data *, float *);
66 typedef struct {
67 uint8_t floor_type;
68 vorbis_floor_decode_func decode;
69 union vorbis_floor_u {
70 struct vorbis_floor0_s {
71 uint8_t order;
72 uint16_t rate;
73 uint16_t bark_map_size;
74 int32_t *map[2];
75 uint32_t map_size[2];
76 uint8_t amplitude_bits;
77 uint8_t amplitude_offset;
78 uint8_t num_books;
79 uint8_t *book_list;
80 float *lsp;
81 } t0;
82 struct vorbis_floor1_s {
83 uint8_t partitions;
84 uint8_t partition_class[32];
85 uint8_t class_dimensions[16];
86 uint8_t class_subclasses[16];
87 uint8_t class_masterbook[16];
88 int16_t subclass_books[16][8];
89 uint8_t multiplier;
90 uint16_t x_list_dim;
91 vorbis_floor1_entry *list;
92 } t1;
93 } data;
94 } vorbis_floor;
95
96 typedef struct {
97 uint16_t type;
98 uint32_t begin;
99 uint32_t end;
100 unsigned partition_size;
101 uint8_t classifications;
102 uint8_t classbook;
103 int16_t books[64][8];
104 uint8_t maxpass;
105 uint16_t ptns_to_read;
106 uint8_t *classifs;
107 } vorbis_residue;
108
109 typedef struct {
110 uint8_t submaps;
111 uint16_t coupling_steps;
112 uint8_t *magnitude;
113 uint8_t *angle;
114 uint8_t *mux;
115 uint8_t submap_floor[16];
116 uint8_t submap_residue[16];
117 } vorbis_mapping;
118
119 typedef struct {
120 uint8_t blockflag;
121 uint16_t windowtype;
122 uint16_t transformtype;
123 uint8_t mapping;
124 } vorbis_mode;
125
126 typedef struct vorbis_context_s {
127 AVCodecContext *avctx;
128 GetBitContext gb;
129 VorbisDSPContext dsp;
130 AVFloatDSPContext fdsp;
131 FmtConvertContext fmt_conv;
132
133 FFTContext mdct[2];
134 uint8_t first_frame;
135 uint32_t version;
136 uint8_t audio_channels;
137 uint32_t audio_samplerate;
138 uint32_t bitrate_maximum;
139 uint32_t bitrate_nominal;
140 uint32_t bitrate_minimum;
141 uint32_t blocksize[2];
142 const float *win[2];
143 uint16_t codebook_count;
144 vorbis_codebook *codebooks;
145 uint8_t floor_count;
146 vorbis_floor *floors;
147 uint8_t residue_count;
148 vorbis_residue *residues;
149 uint8_t mapping_count;
150 vorbis_mapping *mappings;
151 uint8_t mode_count;
152 vorbis_mode *modes;
153 uint8_t mode_number; // mode number for the current packet
154 int8_t previous_window;
155 float *channel_residues;
156 float *saved;
157 } vorbis_context;
158
159 /* Helper functions */
160
161 #define BARK(x) \
162 (13.1f * atan(0.00074f * (x)) + 2.24f * atan(1.85e-8f * (x) * (x)) + 1e-4f * (x))
163
164 static const char idx_err_str[] = "Index value %d out of range (0 - %d) for %s at %s:%i\n";
165 #define VALIDATE_INDEX(idx, limit) \
166 if (idx >= limit) {\
167 av_log(vc->avctx, AV_LOG_ERROR,\
168 idx_err_str,\
169 (int)(idx), (int)(limit - 1), #idx, __FILE__, __LINE__);\
170 return AVERROR_INVALIDDATA;\
171 }
172 #define GET_VALIDATED_INDEX(idx, bits, limit) \
173 {\
174 idx = get_bits(gb, bits);\
175 VALIDATE_INDEX(idx, limit)\
176 }
177
vorbisfloat2float(unsigned val)178 static float vorbisfloat2float(unsigned val)
179 {
180 double mant = val & 0x1fffff;
181 long exp = (val & 0x7fe00000L) >> 21;
182 if (val & 0x80000000)
183 mant = -mant;
184 return ldexp(mant, exp - 20 - 768);
185 }
186
187
188 // Free all allocated memory -----------------------------------------
189
vorbis_free(vorbis_context * vc)190 static void vorbis_free(vorbis_context *vc)
191 {
192 int i;
193
194 av_freep(&vc->channel_residues);
195 av_freep(&vc->saved);
196
197 if (vc->residues)
198 for (i = 0; i < vc->residue_count; i++)
199 av_free(vc->residues[i].classifs);
200 av_freep(&vc->residues);
201 av_freep(&vc->modes);
202
203 ff_mdct_end(&vc->mdct[0]);
204 ff_mdct_end(&vc->mdct[1]);
205
206 if (vc->codebooks)
207 for (i = 0; i < vc->codebook_count; ++i) {
208 av_free(vc->codebooks[i].codevectors);
209 ff_free_vlc(&vc->codebooks[i].vlc);
210 }
211 av_freep(&vc->codebooks);
212
213 if (vc->floors)
214 for (i = 0; i < vc->floor_count; ++i) {
215 if (vc->floors[i].floor_type == 0) {
216 av_free(vc->floors[i].data.t0.map[0]);
217 av_free(vc->floors[i].data.t0.map[1]);
218 av_free(vc->floors[i].data.t0.book_list);
219 av_free(vc->floors[i].data.t0.lsp);
220 } else {
221 av_free(vc->floors[i].data.t1.list);
222 }
223 }
224 av_freep(&vc->floors);
225
226 if (vc->mappings)
227 for (i = 0; i < vc->mapping_count; ++i) {
228 av_free(vc->mappings[i].magnitude);
229 av_free(vc->mappings[i].angle);
230 av_free(vc->mappings[i].mux);
231 }
232 av_freep(&vc->mappings);
233 }
234
235 // Parse setup header -------------------------------------------------
236
237 // Process codebooks part
238
vorbis_parse_setup_hdr_codebooks(vorbis_context * vc)239 static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc)
240 {
241 unsigned cb;
242 uint8_t *tmp_vlc_bits = NULL;
243 uint32_t *tmp_vlc_codes = NULL;
244 GetBitContext *gb = &vc->gb;
245 uint16_t *codebook_multiplicands = NULL;
246 int ret = 0;
247
248 vc->codebook_count = get_bits(gb, 8) + 1;
249
250 av_dlog(NULL, " Codebooks: %d \n", vc->codebook_count);
251
252 vc->codebooks = av_mallocz(vc->codebook_count * sizeof(*vc->codebooks));
253 tmp_vlc_bits = av_mallocz(V_MAX_VLCS * sizeof(*tmp_vlc_bits));
254 tmp_vlc_codes = av_mallocz(V_MAX_VLCS * sizeof(*tmp_vlc_codes));
255 codebook_multiplicands = av_malloc(V_MAX_VLCS * sizeof(*codebook_multiplicands));
256 if (!vc->codebooks ||
257 !tmp_vlc_bits || !tmp_vlc_codes || !codebook_multiplicands) {
258 ret = AVERROR(ENOMEM);
259 goto error;
260 }
261
262 for (cb = 0; cb < vc->codebook_count; ++cb) {
263 vorbis_codebook *codebook_setup = &vc->codebooks[cb];
264 unsigned ordered, t, entries, used_entries = 0;
265
266 av_dlog(NULL, " %u. Codebook\n", cb);
267
268 if (get_bits(gb, 24) != 0x564342) {
269 av_log(vc->avctx, AV_LOG_ERROR,
270 " %u. Codebook setup data corrupt.\n", cb);
271 ret = AVERROR_INVALIDDATA;
272 goto error;
273 }
274
275 codebook_setup->dimensions=get_bits(gb, 16);
276 if (codebook_setup->dimensions > 16 || codebook_setup->dimensions == 0) {
277 av_log(vc->avctx, AV_LOG_ERROR,
278 " %u. Codebook's dimension is invalid (%d).\n",
279 cb, codebook_setup->dimensions);
280 ret = AVERROR_INVALIDDATA;
281 goto error;
282 }
283 entries = get_bits(gb, 24);
284 if (entries > V_MAX_VLCS) {
285 av_log(vc->avctx, AV_LOG_ERROR,
286 " %u. Codebook has too many entries (%u).\n",
287 cb, entries);
288 ret = AVERROR_INVALIDDATA;
289 goto error;
290 }
291
292 ordered = get_bits1(gb);
293
294 av_dlog(NULL, " codebook_dimensions %d, codebook_entries %u\n",
295 codebook_setup->dimensions, entries);
296
297 if (!ordered) {
298 unsigned ce, flag;
299 unsigned sparse = get_bits1(gb);
300
301 av_dlog(NULL, " not ordered \n");
302
303 if (sparse) {
304 av_dlog(NULL, " sparse \n");
305
306 used_entries = 0;
307 for (ce = 0; ce < entries; ++ce) {
308 flag = get_bits1(gb);
309 if (flag) {
310 tmp_vlc_bits[ce] = get_bits(gb, 5) + 1;
311 ++used_entries;
312 } else
313 tmp_vlc_bits[ce] = 0;
314 }
315 } else {
316 av_dlog(NULL, " not sparse \n");
317
318 used_entries = entries;
319 for (ce = 0; ce < entries; ++ce)
320 tmp_vlc_bits[ce] = get_bits(gb, 5) + 1;
321 }
322 } else {
323 unsigned current_entry = 0;
324 unsigned current_length = get_bits(gb, 5) + 1;
325
326 av_dlog(NULL, " ordered, current length: %u\n", current_length); //FIXME
327
328 used_entries = entries;
329 for (; current_entry < used_entries && current_length <= 32; ++current_length) {
330 unsigned i, number;
331
332 av_dlog(NULL, " number bits: %u ", ilog(entries - current_entry));
333
334 number = get_bits(gb, ilog(entries - current_entry));
335
336 av_dlog(NULL, " number: %u\n", number);
337
338 for (i = current_entry; i < number+current_entry; ++i)
339 if (i < used_entries)
340 tmp_vlc_bits[i] = current_length;
341
342 current_entry+=number;
343 }
344 if (current_entry>used_entries) {
345 av_log(vc->avctx, AV_LOG_ERROR, " More codelengths than codes in codebook. \n");
346 ret = AVERROR_INVALIDDATA;
347 goto error;
348 }
349 }
350
351 codebook_setup->lookup_type = get_bits(gb, 4);
352
353 av_dlog(NULL, " lookup type: %d : %s \n", codebook_setup->lookup_type,
354 codebook_setup->lookup_type ? "vq" : "no lookup");
355
356 // If the codebook is used for (inverse) VQ, calculate codevectors.
357
358 if (codebook_setup->lookup_type == 1) {
359 unsigned i, j, k;
360 unsigned codebook_lookup_values = ff_vorbis_nth_root(entries, codebook_setup->dimensions);
361
362 float codebook_minimum_value = vorbisfloat2float(get_bits_long(gb, 32));
363 float codebook_delta_value = vorbisfloat2float(get_bits_long(gb, 32));
364 unsigned codebook_value_bits = get_bits(gb, 4) + 1;
365 unsigned codebook_sequence_p = get_bits1(gb);
366
367 av_dlog(NULL, " We expect %d numbers for building the codevectors. \n",
368 codebook_lookup_values);
369 av_dlog(NULL, " delta %f minmum %f \n",
370 codebook_delta_value, codebook_minimum_value);
371
372 for (i = 0; i < codebook_lookup_values; ++i) {
373 codebook_multiplicands[i] = get_bits(gb, codebook_value_bits);
374
375 av_dlog(NULL, " multiplicands*delta+minmum : %e \n",
376 (float)codebook_multiplicands[i] * codebook_delta_value + codebook_minimum_value);
377 av_dlog(NULL, " multiplicand %u\n", codebook_multiplicands[i]);
378 }
379
380 // Weed out unused vlcs and build codevector vector
381 codebook_setup->codevectors = used_entries ? av_mallocz_array(used_entries,
382 codebook_setup->dimensions *
383 sizeof(*codebook_setup->codevectors))
384 : NULL;
385 for (j = 0, i = 0; i < entries; ++i) {
386 unsigned dim = codebook_setup->dimensions;
387
388 if (tmp_vlc_bits[i]) {
389 float last = 0.0;
390 unsigned lookup_offset = i;
391
392 av_dlog(vc->avctx, "Lookup offset %u ,", i);
393
394 for (k = 0; k < dim; ++k) {
395 unsigned multiplicand_offset = lookup_offset % codebook_lookup_values;
396 codebook_setup->codevectors[j * dim + k] = codebook_multiplicands[multiplicand_offset] * codebook_delta_value + codebook_minimum_value + last;
397 if (codebook_sequence_p)
398 last = codebook_setup->codevectors[j * dim + k];
399 lookup_offset/=codebook_lookup_values;
400 }
401 tmp_vlc_bits[j] = tmp_vlc_bits[i];
402
403 av_dlog(vc->avctx, "real lookup offset %u, vector: ", j);
404 for (k = 0; k < dim; ++k)
405 av_dlog(vc->avctx, " %f ",
406 codebook_setup->codevectors[j * dim + k]);
407 av_dlog(vc->avctx, "\n");
408
409 ++j;
410 }
411 }
412 if (j != used_entries) {
413 av_log(vc->avctx, AV_LOG_ERROR, "Bug in codevector vector building code. \n");
414 ret = AVERROR_INVALIDDATA;
415 goto error;
416 }
417 entries = used_entries;
418 } else if (codebook_setup->lookup_type >= 2) {
419 av_log(vc->avctx, AV_LOG_ERROR, "Codebook lookup type not supported. \n");
420 ret = AVERROR_INVALIDDATA;
421 goto error;
422 }
423
424 // Initialize VLC table
425 if (ff_vorbis_len2vlc(tmp_vlc_bits, tmp_vlc_codes, entries)) {
426 av_log(vc->avctx, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");
427 ret = AVERROR_INVALIDDATA;
428 goto error;
429 }
430 codebook_setup->maxdepth = 0;
431 for (t = 0; t < entries; ++t)
432 if (tmp_vlc_bits[t] >= codebook_setup->maxdepth)
433 codebook_setup->maxdepth = tmp_vlc_bits[t];
434
435 if (codebook_setup->maxdepth > 3 * V_NB_BITS)
436 codebook_setup->nb_bits = V_NB_BITS2;
437 else
438 codebook_setup->nb_bits = V_NB_BITS;
439
440 codebook_setup->maxdepth = (codebook_setup->maxdepth+codebook_setup->nb_bits - 1) / codebook_setup->nb_bits;
441
442 if ((ret = init_vlc(&codebook_setup->vlc, codebook_setup->nb_bits,
443 entries, tmp_vlc_bits, sizeof(*tmp_vlc_bits),
444 sizeof(*tmp_vlc_bits), tmp_vlc_codes,
445 sizeof(*tmp_vlc_codes), sizeof(*tmp_vlc_codes),
446 INIT_VLC_LE))) {
447 av_log(vc->avctx, AV_LOG_ERROR, " Error generating vlc tables. \n");
448 goto error;
449 }
450 }
451
452 av_free(tmp_vlc_bits);
453 av_free(tmp_vlc_codes);
454 av_free(codebook_multiplicands);
455 return 0;
456
457 // Error:
458 error:
459 av_free(tmp_vlc_bits);
460 av_free(tmp_vlc_codes);
461 av_free(codebook_multiplicands);
462 return ret;
463 }
464
465 // Process time domain transforms part (unused in Vorbis I)
466
vorbis_parse_setup_hdr_tdtransforms(vorbis_context * vc)467 static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc)
468 {
469 GetBitContext *gb = &vc->gb;
470 unsigned i, vorbis_time_count = get_bits(gb, 6) + 1;
471
472 for (i = 0; i < vorbis_time_count; ++i) {
473 unsigned vorbis_tdtransform = get_bits(gb, 16);
474
475 av_dlog(NULL, " Vorbis time domain transform %u: %u\n",
476 vorbis_time_count, vorbis_tdtransform);
477
478 if (vorbis_tdtransform) {
479 av_log(vc->avctx, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n");
480 return AVERROR_INVALIDDATA;
481 }
482 }
483 return 0;
484 }
485
486 // Process floors part
487
488 static int vorbis_floor0_decode(vorbis_context *vc,
489 vorbis_floor_data *vfu, float *vec);
490 static int create_map(vorbis_context *vc, unsigned floor_number);
491 static int vorbis_floor1_decode(vorbis_context *vc,
492 vorbis_floor_data *vfu, float *vec);
vorbis_parse_setup_hdr_floors(vorbis_context * vc)493 static int vorbis_parse_setup_hdr_floors(vorbis_context *vc)
494 {
495 GetBitContext *gb = &vc->gb;
496 int i, j, k, ret;
497
498 vc->floor_count = get_bits(gb, 6) + 1;
499
500 vc->floors = av_mallocz(vc->floor_count * sizeof(*vc->floors));
501 if (!vc->floors)
502 return AVERROR(ENOMEM);
503
504 for (i = 0; i < vc->floor_count; ++i) {
505 vorbis_floor *floor_setup = &vc->floors[i];
506
507 floor_setup->floor_type = get_bits(gb, 16);
508
509 av_dlog(NULL, " %d. floor type %d \n", i, floor_setup->floor_type);
510
511 if (floor_setup->floor_type == 1) {
512 int maximum_class = -1;
513 unsigned rangebits, rangemax, floor1_values = 2;
514
515 floor_setup->decode = vorbis_floor1_decode;
516
517 floor_setup->data.t1.partitions = get_bits(gb, 5);
518
519 av_dlog(NULL, " %d.floor: %d partitions \n",
520 i, floor_setup->data.t1.partitions);
521
522 for (j = 0; j < floor_setup->data.t1.partitions; ++j) {
523 floor_setup->data.t1.partition_class[j] = get_bits(gb, 4);
524 if (floor_setup->data.t1.partition_class[j] > maximum_class)
525 maximum_class = floor_setup->data.t1.partition_class[j];
526
527 av_dlog(NULL, " %d. floor %d partition class %d \n",
528 i, j, floor_setup->data.t1.partition_class[j]);
529
530 }
531
532 av_dlog(NULL, " maximum class %d \n", maximum_class);
533
534 for (j = 0; j <= maximum_class; ++j) {
535 floor_setup->data.t1.class_dimensions[j] = get_bits(gb, 3) + 1;
536 floor_setup->data.t1.class_subclasses[j] = get_bits(gb, 2);
537
538 av_dlog(NULL, " %d floor %d class dim: %d subclasses %d \n", i, j,
539 floor_setup->data.t1.class_dimensions[j],
540 floor_setup->data.t1.class_subclasses[j]);
541
542 if (floor_setup->data.t1.class_subclasses[j]) {
543 GET_VALIDATED_INDEX(floor_setup->data.t1.class_masterbook[j], 8, vc->codebook_count)
544
545 av_dlog(NULL, " masterbook: %d \n", floor_setup->data.t1.class_masterbook[j]);
546 }
547
548 for (k = 0; k < (1 << floor_setup->data.t1.class_subclasses[j]); ++k) {
549 int16_t bits = get_bits(gb, 8) - 1;
550 if (bits != -1)
551 VALIDATE_INDEX(bits, vc->codebook_count)
552 floor_setup->data.t1.subclass_books[j][k] = bits;
553
554 av_dlog(NULL, " book %d. : %d \n", k, floor_setup->data.t1.subclass_books[j][k]);
555 }
556 }
557
558 floor_setup->data.t1.multiplier = get_bits(gb, 2) + 1;
559 floor_setup->data.t1.x_list_dim = 2;
560
561 for (j = 0; j < floor_setup->data.t1.partitions; ++j)
562 floor_setup->data.t1.x_list_dim+=floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];
563
564 floor_setup->data.t1.list = av_mallocz_array(floor_setup->data.t1.x_list_dim,
565 sizeof(*floor_setup->data.t1.list));
566 if (!floor_setup->data.t1.list)
567 return AVERROR(ENOMEM);
568
569 rangebits = get_bits(gb, 4);
570 rangemax = (1 << rangebits);
571 if (rangemax > vc->blocksize[1] / 2) {
572 av_log(vc->avctx, AV_LOG_ERROR,
573 "Floor value is too large for blocksize: %u (%"PRIu32")\n",
574 rangemax, vc->blocksize[1] / 2);
575 return AVERROR_INVALIDDATA;
576 }
577 floor_setup->data.t1.list[0].x = 0;
578 floor_setup->data.t1.list[1].x = rangemax;
579
580 for (j = 0; j < floor_setup->data.t1.partitions; ++j) {
581 for (k = 0; k < floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]]; ++k, ++floor1_values) {
582 floor_setup->data.t1.list[floor1_values].x = get_bits(gb, rangebits);
583
584 av_dlog(NULL, " %u. floor1 Y coord. %d\n", floor1_values,
585 floor_setup->data.t1.list[floor1_values].x);
586 }
587 }
588
589 // Precalculate order of x coordinates - needed for decode
590 if (ff_vorbis_ready_floor1_list(vc->avctx,
591 floor_setup->data.t1.list,
592 floor_setup->data.t1.x_list_dim)) {
593 return AVERROR_INVALIDDATA;
594 }
595 } else if (floor_setup->floor_type == 0) {
596 unsigned max_codebook_dim = 0;
597
598 floor_setup->decode = vorbis_floor0_decode;
599
600 floor_setup->data.t0.order = get_bits(gb, 8);
601 if (!floor_setup->data.t0.order) {
602 av_log(vc->avctx, AV_LOG_ERROR, "Floor 0 order is 0.\n");
603 return AVERROR_INVALIDDATA;
604 }
605 floor_setup->data.t0.rate = get_bits(gb, 16);
606 if (!floor_setup->data.t0.rate) {
607 av_log(vc->avctx, AV_LOG_ERROR, "Floor 0 rate is 0.\n");
608 return AVERROR_INVALIDDATA;
609 }
610 floor_setup->data.t0.bark_map_size = get_bits(gb, 16);
611 if (!floor_setup->data.t0.bark_map_size) {
612 av_log(vc->avctx, AV_LOG_ERROR,
613 "Floor 0 bark map size is 0.\n");
614 return AVERROR_INVALIDDATA;
615 }
616 floor_setup->data.t0.amplitude_bits = get_bits(gb, 6);
617 floor_setup->data.t0.amplitude_offset = get_bits(gb, 8);
618 floor_setup->data.t0.num_books = get_bits(gb, 4) + 1;
619
620 /* allocate mem for booklist */
621 floor_setup->data.t0.book_list =
622 av_malloc(floor_setup->data.t0.num_books);
623 if (!floor_setup->data.t0.book_list)
624 return AVERROR(ENOMEM);
625 /* read book indexes */
626 {
627 int idx;
628 unsigned book_idx;
629 for (idx = 0; idx < floor_setup->data.t0.num_books; ++idx) {
630 GET_VALIDATED_INDEX(book_idx, 8, vc->codebook_count)
631 floor_setup->data.t0.book_list[idx] = book_idx;
632 if (vc->codebooks[book_idx].dimensions > max_codebook_dim)
633 max_codebook_dim = vc->codebooks[book_idx].dimensions;
634 }
635 }
636
637 if ((ret = create_map(vc, i)) < 0)
638 return ret;
639
640 /* codebook dim is for padding if codebook dim doesn't *
641 * divide order+1 then we need to read more data */
642 floor_setup->data.t0.lsp =
643 av_malloc_array((floor_setup->data.t0.order + 1 + max_codebook_dim),
644 sizeof(*floor_setup->data.t0.lsp));
645 if (!floor_setup->data.t0.lsp)
646 return AVERROR(ENOMEM);
647
648 /* debug output parsed headers */
649 av_dlog(NULL, "floor0 order: %u\n", floor_setup->data.t0.order);
650 av_dlog(NULL, "floor0 rate: %u\n", floor_setup->data.t0.rate);
651 av_dlog(NULL, "floor0 bark map size: %u\n",
652 floor_setup->data.t0.bark_map_size);
653 av_dlog(NULL, "floor0 amplitude bits: %u\n",
654 floor_setup->data.t0.amplitude_bits);
655 av_dlog(NULL, "floor0 amplitude offset: %u\n",
656 floor_setup->data.t0.amplitude_offset);
657 av_dlog(NULL, "floor0 number of books: %u\n",
658 floor_setup->data.t0.num_books);
659 av_dlog(NULL, "floor0 book list pointer: %p\n",
660 floor_setup->data.t0.book_list);
661 {
662 int idx;
663 for (idx = 0; idx < floor_setup->data.t0.num_books; ++idx) {
664 av_dlog(NULL, " Book %d: %u\n", idx + 1,
665 floor_setup->data.t0.book_list[idx]);
666 }
667 }
668 } else {
669 av_log(vc->avctx, AV_LOG_ERROR, "Invalid floor type!\n");
670 return AVERROR_INVALIDDATA;
671 }
672 }
673 return 0;
674 }
675
676 // Process residues part
677
vorbis_parse_setup_hdr_residues(vorbis_context * vc)678 static int vorbis_parse_setup_hdr_residues(vorbis_context *vc)
679 {
680 GetBitContext *gb = &vc->gb;
681 unsigned i, j, k;
682
683 vc->residue_count = get_bits(gb, 6)+1;
684 vc->residues = av_mallocz(vc->residue_count * sizeof(*vc->residues));
685 if (!vc->residues)
686 return AVERROR(ENOMEM);
687
688 av_dlog(NULL, " There are %d residues. \n", vc->residue_count);
689
690 for (i = 0; i < vc->residue_count; ++i) {
691 vorbis_residue *res_setup = &vc->residues[i];
692 uint8_t cascade[64];
693 unsigned high_bits, low_bits;
694
695 res_setup->type = get_bits(gb, 16);
696
697 av_dlog(NULL, " %u. residue type %d\n", i, res_setup->type);
698
699 res_setup->begin = get_bits(gb, 24);
700 res_setup->end = get_bits(gb, 24);
701 res_setup->partition_size = get_bits(gb, 24) + 1;
702 /* Validations to prevent a buffer overflow later. */
703 if (res_setup->begin>res_setup->end ||
704 (res_setup->end-res_setup->begin) / res_setup->partition_size > FFMIN(V_MAX_PARTITIONS, 65535)) {
705 av_log(vc->avctx, AV_LOG_ERROR,
706 "partition out of bounds: type, begin, end, size, blocksize: %"PRIu16", %"PRIu32", %"PRIu32", %u, %"PRIu32"\n",
707 res_setup->type, res_setup->begin, res_setup->end,
708 res_setup->partition_size, vc->blocksize[1] / 2);
709 return AVERROR_INVALIDDATA;
710 }
711
712 res_setup->classifications = get_bits(gb, 6) + 1;
713 GET_VALIDATED_INDEX(res_setup->classbook, 8, vc->codebook_count)
714
715 res_setup->ptns_to_read =
716 (res_setup->end - res_setup->begin) / res_setup->partition_size;
717 res_setup->classifs = av_malloc_array(res_setup->ptns_to_read,
718 vc->audio_channels *
719 sizeof(*res_setup->classifs));
720 if (!res_setup->classifs)
721 return AVERROR(ENOMEM);
722
723 av_dlog(NULL, " begin %d end %d part.size %d classif.s %d classbook %d \n",
724 res_setup->begin, res_setup->end, res_setup->partition_size,
725 res_setup->classifications, res_setup->classbook);
726
727 for (j = 0; j < res_setup->classifications; ++j) {
728 high_bits = 0;
729 low_bits = get_bits(gb, 3);
730 if (get_bits1(gb))
731 high_bits = get_bits(gb, 5);
732 cascade[j] = (high_bits << 3) + low_bits;
733
734 av_dlog(NULL, " %u class cascade depth: %d\n", j, ilog(cascade[j]));
735 }
736
737 res_setup->maxpass = 0;
738 for (j = 0; j < res_setup->classifications; ++j) {
739 for (k = 0; k < 8; ++k) {
740 if (cascade[j]&(1 << k)) {
741 GET_VALIDATED_INDEX(res_setup->books[j][k], 8, vc->codebook_count)
742
743 av_dlog(NULL, " %u class cascade depth %u book: %d\n",
744 j, k, res_setup->books[j][k]);
745
746 if (k>res_setup->maxpass)
747 res_setup->maxpass = k;
748 } else {
749 res_setup->books[j][k] = -1;
750 }
751 }
752 }
753 }
754 return 0;
755 }
756
757 // Process mappings part
758
vorbis_parse_setup_hdr_mappings(vorbis_context * vc)759 static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc)
760 {
761 GetBitContext *gb = &vc->gb;
762 unsigned i, j;
763
764 vc->mapping_count = get_bits(gb, 6)+1;
765 vc->mappings = av_mallocz(vc->mapping_count * sizeof(*vc->mappings));
766 if (!vc->mappings)
767 return AVERROR(ENOMEM);
768
769 av_dlog(NULL, " There are %d mappings. \n", vc->mapping_count);
770
771 for (i = 0; i < vc->mapping_count; ++i) {
772 vorbis_mapping *mapping_setup = &vc->mappings[i];
773
774 if (get_bits(gb, 16)) {
775 av_log(vc->avctx, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n");
776 return AVERROR_INVALIDDATA;
777 }
778 if (get_bits1(gb)) {
779 mapping_setup->submaps = get_bits(gb, 4) + 1;
780 } else {
781 mapping_setup->submaps = 1;
782 }
783
784 if (get_bits1(gb)) {
785 mapping_setup->coupling_steps = get_bits(gb, 8) + 1;
786 mapping_setup->magnitude = av_mallocz(mapping_setup->coupling_steps *
787 sizeof(*mapping_setup->magnitude));
788 mapping_setup->angle = av_mallocz(mapping_setup->coupling_steps *
789 sizeof(*mapping_setup->angle));
790 if (!mapping_setup->angle || !mapping_setup->magnitude)
791 return AVERROR(ENOMEM);
792
793 for (j = 0; j < mapping_setup->coupling_steps; ++j) {
794 GET_VALIDATED_INDEX(mapping_setup->magnitude[j], ilog(vc->audio_channels - 1), vc->audio_channels)
795 GET_VALIDATED_INDEX(mapping_setup->angle[j], ilog(vc->audio_channels - 1), vc->audio_channels)
796 }
797 } else {
798 mapping_setup->coupling_steps = 0;
799 }
800
801 av_dlog(NULL, " %u mapping coupling steps: %d\n",
802 i, mapping_setup->coupling_steps);
803
804 if (get_bits(gb, 2)) {
805 av_log(vc->avctx, AV_LOG_ERROR, "%u. mapping setup data invalid.\n", i);
806 return AVERROR_INVALIDDATA; // following spec.
807 }
808
809 if (mapping_setup->submaps>1) {
810 mapping_setup->mux = av_mallocz_array(vc->audio_channels,
811 sizeof(*mapping_setup->mux));
812 if (!mapping_setup->mux)
813 return AVERROR(ENOMEM);
814
815 for (j = 0; j < vc->audio_channels; ++j)
816 mapping_setup->mux[j] = get_bits(gb, 4);
817 }
818
819 for (j = 0; j < mapping_setup->submaps; ++j) {
820 skip_bits(gb, 8); // FIXME check?
821 GET_VALIDATED_INDEX(mapping_setup->submap_floor[j], 8, vc->floor_count)
822 GET_VALIDATED_INDEX(mapping_setup->submap_residue[j], 8, vc->residue_count)
823
824 av_dlog(NULL, " %u mapping %u submap : floor %d, residue %d\n", i, j,
825 mapping_setup->submap_floor[j],
826 mapping_setup->submap_residue[j]);
827 }
828 }
829 return 0;
830 }
831
832 // Process modes part
833
create_map(vorbis_context * vc,unsigned floor_number)834 static int create_map(vorbis_context *vc, unsigned floor_number)
835 {
836 vorbis_floor *floors = vc->floors;
837 vorbis_floor0 *vf;
838 int idx;
839 int blockflag, n;
840 int32_t *map;
841
842 for (blockflag = 0; blockflag < 2; ++blockflag) {
843 n = vc->blocksize[blockflag] / 2;
844 floors[floor_number].data.t0.map[blockflag] =
845 av_malloc_array(n + 1, sizeof(int32_t)); // n + sentinel
846 if (!floors[floor_number].data.t0.map[blockflag])
847 return AVERROR(ENOMEM);
848
849 map = floors[floor_number].data.t0.map[blockflag];
850 vf = &floors[floor_number].data.t0;
851
852 for (idx = 0; idx < n; ++idx) {
853 map[idx] = floor(BARK((vf->rate * idx) / (2.0f * n)) *
854 (vf->bark_map_size / BARK(vf->rate / 2.0f)));
855 if (vf->bark_map_size-1 < map[idx])
856 map[idx] = vf->bark_map_size - 1;
857 }
858 map[n] = -1;
859 vf->map_size[blockflag] = n;
860 }
861
862 for (idx = 0; idx <= n; ++idx) {
863 av_dlog(NULL, "floor0 map: map at pos %d is %d\n", idx, map[idx]);
864 }
865
866 return 0;
867 }
868
vorbis_parse_setup_hdr_modes(vorbis_context * vc)869 static int vorbis_parse_setup_hdr_modes(vorbis_context *vc)
870 {
871 GetBitContext *gb = &vc->gb;
872 unsigned i;
873
874 vc->mode_count = get_bits(gb, 6) + 1;
875 vc->modes = av_mallocz(vc->mode_count * sizeof(*vc->modes));
876 if (!vc->modes)
877 return AVERROR(ENOMEM);
878
879 av_dlog(NULL, " There are %d modes.\n", vc->mode_count);
880
881 for (i = 0; i < vc->mode_count; ++i) {
882 vorbis_mode *mode_setup = &vc->modes[i];
883
884 mode_setup->blockflag = get_bits1(gb);
885 mode_setup->windowtype = get_bits(gb, 16); //FIXME check
886 mode_setup->transformtype = get_bits(gb, 16); //FIXME check
887 GET_VALIDATED_INDEX(mode_setup->mapping, 8, vc->mapping_count);
888
889 av_dlog(NULL, " %u mode: blockflag %d, windowtype %d, transformtype %d, mapping %d\n",
890 i, mode_setup->blockflag, mode_setup->windowtype,
891 mode_setup->transformtype, mode_setup->mapping);
892 }
893 return 0;
894 }
895
896 // Process the whole setup header using the functions above
897
vorbis_parse_setup_hdr(vorbis_context * vc)898 static int vorbis_parse_setup_hdr(vorbis_context *vc)
899 {
900 GetBitContext *gb = &vc->gb;
901 int ret;
902
903 if ((get_bits(gb, 8) != 'v') || (get_bits(gb, 8) != 'o') ||
904 (get_bits(gb, 8) != 'r') || (get_bits(gb, 8) != 'b') ||
905 (get_bits(gb, 8) != 'i') || (get_bits(gb, 8) != 's')) {
906 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n");
907 return AVERROR_INVALIDDATA;
908 }
909
910 if ((ret = vorbis_parse_setup_hdr_codebooks(vc))) {
911 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n");
912 return ret;
913 }
914 if ((ret = vorbis_parse_setup_hdr_tdtransforms(vc))) {
915 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n");
916 return ret;
917 }
918 if ((ret = vorbis_parse_setup_hdr_floors(vc))) {
919 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n");
920 return ret;
921 }
922 if ((ret = vorbis_parse_setup_hdr_residues(vc))) {
923 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n");
924 return ret;
925 }
926 if ((ret = vorbis_parse_setup_hdr_mappings(vc))) {
927 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n");
928 return ret;
929 }
930 if ((ret = vorbis_parse_setup_hdr_modes(vc))) {
931 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n");
932 return ret;
933 }
934 if (!get_bits1(gb)) {
935 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n");
936 return AVERROR_INVALIDDATA; // framing flag bit unset error
937 }
938
939 return 0;
940 }
941
942 // Process the identification header
943
vorbis_parse_id_hdr(vorbis_context * vc)944 static int vorbis_parse_id_hdr(vorbis_context *vc)
945 {
946 GetBitContext *gb = &vc->gb;
947 unsigned bl0, bl1;
948
949 if ((get_bits(gb, 8) != 'v') || (get_bits(gb, 8) != 'o') ||
950 (get_bits(gb, 8) != 'r') || (get_bits(gb, 8) != 'b') ||
951 (get_bits(gb, 8) != 'i') || (get_bits(gb, 8) != 's')) {
952 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n");
953 return AVERROR_INVALIDDATA;
954 }
955
956 vc->version = get_bits_long(gb, 32); //FIXME check 0
957 vc->audio_channels = get_bits(gb, 8);
958 if (vc->audio_channels <= 0) {
959 av_log(vc->avctx, AV_LOG_ERROR, "Invalid number of channels\n");
960 return AVERROR_INVALIDDATA;
961 }
962 vc->audio_samplerate = get_bits_long(gb, 32);
963 if (vc->audio_samplerate <= 0) {
964 av_log(vc->avctx, AV_LOG_ERROR, "Invalid samplerate\n");
965 return AVERROR_INVALIDDATA;
966 }
967 vc->bitrate_maximum = get_bits_long(gb, 32);
968 vc->bitrate_nominal = get_bits_long(gb, 32);
969 vc->bitrate_minimum = get_bits_long(gb, 32);
970 bl0 = get_bits(gb, 4);
971 bl1 = get_bits(gb, 4);
972 if (bl0 > 13 || bl0 < 6 || bl1 > 13 || bl1 < 6 || bl1 < bl0) {
973 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n");
974 return AVERROR_INVALIDDATA;
975 }
976 vc->blocksize[0] = (1 << bl0);
977 vc->blocksize[1] = (1 << bl1);
978 vc->win[0] = ff_vorbis_vwin[bl0 - 6];
979 vc->win[1] = ff_vorbis_vwin[bl1 - 6];
980
981 if ((get_bits1(gb)) == 0) {
982 av_log(vc->avctx, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n");
983 return AVERROR_INVALIDDATA;
984 }
985
986 vc->channel_residues = av_malloc_array(vc->blocksize[1] / 2, vc->audio_channels * sizeof(*vc->channel_residues));
987 vc->saved = av_mallocz_array(vc->blocksize[1] / 4, vc->audio_channels * sizeof(*vc->saved));
988 if (!vc->channel_residues || !vc->saved)
989 return AVERROR(ENOMEM);
990
991 vc->previous_window = -1;
992
993 ff_mdct_init(&vc->mdct[0], bl0, 1, -1.0);
994 ff_mdct_init(&vc->mdct[1], bl1, 1, -1.0);
995
996 av_dlog(NULL, " vorbis version %d \n audio_channels %d \n audio_samplerate %d \n bitrate_max %d \n bitrate_nom %d \n bitrate_min %d \n blk_0 %d blk_1 %d \n ",
997 vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize[0], vc->blocksize[1]);
998
999 /*
1000 BLK = vc->blocksize[0];
1001 for (i = 0; i < BLK / 2; ++i) {
1002 vc->win[0][i] = sin(0.5*3.14159265358*(sin(((float)i + 0.5) / (float)BLK*3.14159265358))*(sin(((float)i + 0.5) / (float)BLK*3.14159265358)));
1003 }
1004 */
1005
1006 return 0;
1007 }
1008
1009 // Process the extradata using the functions above (identification header, setup header)
1010
vorbis_decode_init(AVCodecContext * avctx)1011 static av_cold int vorbis_decode_init(AVCodecContext *avctx)
1012 {
1013 vorbis_context *vc = avctx->priv_data;
1014 uint8_t *headers = avctx->extradata;
1015 int headers_len = avctx->extradata_size;
1016 uint8_t *header_start[3];
1017 int header_len[3];
1018 GetBitContext *gb = &vc->gb;
1019 int hdr_type, ret;
1020
1021 vc->avctx = avctx;
1022 ff_vorbisdsp_init(&vc->dsp);
1023 avpriv_float_dsp_init(&vc->fdsp, avctx->flags & CODEC_FLAG_BITEXACT);
1024 ff_fmt_convert_init(&vc->fmt_conv, avctx);
1025
1026 avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
1027
1028 if (!headers_len) {
1029 av_log(avctx, AV_LOG_ERROR, "Extradata missing.\n");
1030 return AVERROR_INVALIDDATA;
1031 }
1032
1033 if ((ret = avpriv_split_xiph_headers(headers, headers_len, 30, header_start, header_len)) < 0) {
1034 av_log(avctx, AV_LOG_ERROR, "Extradata corrupt.\n");
1035 return ret;
1036 }
1037
1038 init_get_bits(gb, header_start[0], header_len[0]*8);
1039 hdr_type = get_bits(gb, 8);
1040 if (hdr_type != 1) {
1041 av_log(avctx, AV_LOG_ERROR, "First header is not the id header.\n");
1042 return AVERROR_INVALIDDATA;
1043 }
1044 if ((ret = vorbis_parse_id_hdr(vc))) {
1045 av_log(avctx, AV_LOG_ERROR, "Id header corrupt.\n");
1046 vorbis_free(vc);
1047 return ret;
1048 }
1049
1050 init_get_bits(gb, header_start[2], header_len[2]*8);
1051 hdr_type = get_bits(gb, 8);
1052 if (hdr_type != 5) {
1053 av_log(avctx, AV_LOG_ERROR, "Third header is not the setup header.\n");
1054 vorbis_free(vc);
1055 return AVERROR_INVALIDDATA;
1056 }
1057 if ((ret = vorbis_parse_setup_hdr(vc))) {
1058 av_log(avctx, AV_LOG_ERROR, "Setup header corrupt.\n");
1059 vorbis_free(vc);
1060 return ret;
1061 }
1062
1063 if (vc->audio_channels > 8)
1064 avctx->channel_layout = 0;
1065 else
1066 avctx->channel_layout = ff_vorbis_channel_layouts[vc->audio_channels - 1];
1067
1068 avctx->channels = vc->audio_channels;
1069 avctx->sample_rate = vc->audio_samplerate;
1070
1071 return 0;
1072 }
1073
1074 // Decode audiopackets -------------------------------------------------
1075
1076 // Read and decode floor
1077
vorbis_floor0_decode(vorbis_context * vc,vorbis_floor_data * vfu,float * vec)1078 static int vorbis_floor0_decode(vorbis_context *vc,
1079 vorbis_floor_data *vfu, float *vec)
1080 {
1081 vorbis_floor0 *vf = &vfu->t0;
1082 float *lsp = vf->lsp;
1083 unsigned amplitude, book_idx;
1084 unsigned blockflag = vc->modes[vc->mode_number].blockflag;
1085
1086 if (!vf->amplitude_bits)
1087 return 1;
1088
1089 amplitude = get_bits(&vc->gb, vf->amplitude_bits);
1090 if (amplitude > 0) {
1091 float last = 0;
1092 unsigned idx, lsp_len = 0;
1093 vorbis_codebook codebook;
1094
1095 book_idx = get_bits(&vc->gb, ilog(vf->num_books));
1096 if (book_idx >= vf->num_books) {
1097 av_log(vc->avctx, AV_LOG_ERROR, "floor0 dec: booknumber too high!\n");
1098 book_idx = 0;
1099 }
1100 av_dlog(NULL, "floor0 dec: booknumber: %u\n", book_idx);
1101 codebook = vc->codebooks[vf->book_list[book_idx]];
1102 /* Invalid codebook! */
1103 if (!codebook.codevectors)
1104 return AVERROR_INVALIDDATA;
1105
1106 while (lsp_len<vf->order) {
1107 int vec_off;
1108
1109 av_dlog(NULL, "floor0 dec: book dimension: %d\n", codebook.dimensions);
1110 av_dlog(NULL, "floor0 dec: maximum depth: %d\n", codebook.maxdepth);
1111 /* read temp vector */
1112 vec_off = get_vlc2(&vc->gb, codebook.vlc.table,
1113 codebook.nb_bits, codebook.maxdepth)
1114 * codebook.dimensions;
1115 av_dlog(NULL, "floor0 dec: vector offset: %d\n", vec_off);
1116 /* copy each vector component and add last to it */
1117 for (idx = 0; idx < codebook.dimensions; ++idx)
1118 lsp[lsp_len+idx] = codebook.codevectors[vec_off+idx] + last;
1119 last = lsp[lsp_len+idx-1]; /* set last to last vector component */
1120
1121 lsp_len += codebook.dimensions;
1122 }
1123 /* DEBUG: output lsp coeffs */
1124 {
1125 int idx;
1126 for (idx = 0; idx < lsp_len; ++idx)
1127 av_dlog(NULL, "floor0 dec: coeff at %d is %f\n", idx, lsp[idx]);
1128 }
1129
1130 /* synthesize floor output vector */
1131 {
1132 int i;
1133 int order = vf->order;
1134 float wstep = M_PI / vf->bark_map_size;
1135
1136 for (i = 0; i < order; i++)
1137 lsp[i] = 2.0f * cos(lsp[i]);
1138
1139 av_dlog(NULL, "floor0 synth: map_size = %"PRIu32"; m = %d; wstep = %f\n",
1140 vf->map_size[blockflag], order, wstep);
1141
1142 i = 0;
1143 while (i < vf->map_size[blockflag]) {
1144 int j, iter_cond = vf->map[blockflag][i];
1145 float p = 0.5f;
1146 float q = 0.5f;
1147 float two_cos_w = 2.0f * cos(wstep * iter_cond); // needed all times
1148
1149 /* similar part for the q and p products */
1150 for (j = 0; j + 1 < order; j += 2) {
1151 q *= lsp[j] - two_cos_w;
1152 p *= lsp[j + 1] - two_cos_w;
1153 }
1154 if (j == order) { // even order
1155 p *= p * (2.0f - two_cos_w);
1156 q *= q * (2.0f + two_cos_w);
1157 } else { // odd order
1158 q *= two_cos_w-lsp[j]; // one more time for q
1159
1160 /* final step and square */
1161 p *= p * (4.f - two_cos_w * two_cos_w);
1162 q *= q;
1163 }
1164
1165 /* calculate linear floor value */
1166 q = exp((((amplitude*vf->amplitude_offset) /
1167 (((1 << vf->amplitude_bits) - 1) * sqrt(p + q)))
1168 - vf->amplitude_offset) * .11512925f);
1169
1170 /* fill vector */
1171 do {
1172 vec[i] = q; ++i;
1173 } while (vf->map[blockflag][i] == iter_cond);
1174 }
1175 }
1176 } else {
1177 /* this channel is unused */
1178 return 1;
1179 }
1180
1181 av_dlog(NULL, " Floor0 decoded\n");
1182
1183 return 0;
1184 }
1185
vorbis_floor1_decode(vorbis_context * vc,vorbis_floor_data * vfu,float * vec)1186 static int vorbis_floor1_decode(vorbis_context *vc,
1187 vorbis_floor_data *vfu, float *vec)
1188 {
1189 vorbis_floor1 *vf = &vfu->t1;
1190 GetBitContext *gb = &vc->gb;
1191 uint16_t range_v[4] = { 256, 128, 86, 64 };
1192 unsigned range = range_v[vf->multiplier - 1];
1193 uint16_t floor1_Y[258];
1194 uint16_t floor1_Y_final[258];
1195 int floor1_flag[258];
1196 unsigned partition_class, cdim, cbits, csub, cval, offset, i, j;
1197 int book, adx, ady, dy, off, predicted, err;
1198
1199
1200 if (!get_bits1(gb)) // silence
1201 return 1;
1202
1203 // Read values (or differences) for the floor's points
1204
1205 floor1_Y[0] = get_bits(gb, ilog(range - 1));
1206 floor1_Y[1] = get_bits(gb, ilog(range - 1));
1207
1208 av_dlog(NULL, "floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);
1209
1210 offset = 2;
1211 for (i = 0; i < vf->partitions; ++i) {
1212 partition_class = vf->partition_class[i];
1213 cdim = vf->class_dimensions[partition_class];
1214 cbits = vf->class_subclasses[partition_class];
1215 csub = (1 << cbits) - 1;
1216 cval = 0;
1217
1218 av_dlog(NULL, "Cbits %u\n", cbits);
1219
1220 if (cbits) // this reads all subclasses for this partition's class
1221 cval = get_vlc2(gb, vc->codebooks[vf->class_masterbook[partition_class]].vlc.table,
1222 vc->codebooks[vf->class_masterbook[partition_class]].nb_bits, 3);
1223
1224 for (j = 0; j < cdim; ++j) {
1225 book = vf->subclass_books[partition_class][cval & csub];
1226
1227 av_dlog(NULL, "book %d Cbits %u cval %u bits:%d\n",
1228 book, cbits, cval, get_bits_count(gb));
1229
1230 cval = cval >> cbits;
1231 if (book > -1) {
1232 int v = get_vlc2(gb, vc->codebooks[book].vlc.table,
1233 vc->codebooks[book].nb_bits, 3);
1234 if (v < 0)
1235 return AVERROR_INVALIDDATA;
1236 floor1_Y[offset+j] = v;
1237 } else {
1238 floor1_Y[offset+j] = 0;
1239 }
1240
1241 av_dlog(NULL, " floor(%d) = %d \n",
1242 vf->list[offset+j].x, floor1_Y[offset+j]);
1243 }
1244 offset+=cdim;
1245 }
1246
1247 // Amplitude calculation from the differences
1248
1249 floor1_flag[0] = 1;
1250 floor1_flag[1] = 1;
1251 floor1_Y_final[0] = floor1_Y[0];
1252 floor1_Y_final[1] = floor1_Y[1];
1253
1254 for (i = 2; i < vf->x_list_dim; ++i) {
1255 unsigned val, highroom, lowroom, room, high_neigh_offs, low_neigh_offs;
1256
1257 low_neigh_offs = vf->list[i].low;
1258 high_neigh_offs = vf->list[i].high;
1259 dy = floor1_Y_final[high_neigh_offs] - floor1_Y_final[low_neigh_offs]; // render_point begin
1260 adx = vf->list[high_neigh_offs].x - vf->list[low_neigh_offs].x;
1261 ady = FFABS(dy);
1262 err = ady * (vf->list[i].x - vf->list[low_neigh_offs].x);
1263 off = err / adx;
1264 if (dy < 0) {
1265 predicted = floor1_Y_final[low_neigh_offs] - off;
1266 } else {
1267 predicted = floor1_Y_final[low_neigh_offs] + off;
1268 } // render_point end
1269
1270 val = floor1_Y[i];
1271 highroom = range-predicted;
1272 lowroom = predicted;
1273 if (highroom < lowroom) {
1274 room = highroom * 2;
1275 } else {
1276 room = lowroom * 2; // SPEC misspelling
1277 }
1278 if (val) {
1279 floor1_flag[low_neigh_offs] = 1;
1280 floor1_flag[high_neigh_offs] = 1;
1281 floor1_flag[i] = 1;
1282 if (val >= room) {
1283 if (highroom > lowroom) {
1284 floor1_Y_final[i] = av_clip_uint16(val - lowroom + predicted);
1285 } else {
1286 floor1_Y_final[i] = av_clip_uint16(predicted - val + highroom - 1);
1287 }
1288 } else {
1289 if (val & 1) {
1290 floor1_Y_final[i] = av_clip_uint16(predicted - (val + 1) / 2);
1291 } else {
1292 floor1_Y_final[i] = av_clip_uint16(predicted + val / 2);
1293 }
1294 }
1295 } else {
1296 floor1_flag[i] = 0;
1297 floor1_Y_final[i] = av_clip_uint16(predicted);
1298 }
1299
1300 av_dlog(NULL, " Decoded floor(%d) = %u / val %u\n",
1301 vf->list[i].x, floor1_Y_final[i], val);
1302 }
1303
1304 // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?
1305
1306 ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);
1307
1308 av_dlog(NULL, " Floor decoded\n");
1309
1310 return 0;
1311 }
1312
setup_classifs(vorbis_context * vc,vorbis_residue * vr,uint8_t * do_not_decode,unsigned ch_used,int partition_count,int ptns_to_read)1313 static av_always_inline int setup_classifs(vorbis_context *vc,
1314 vorbis_residue *vr,
1315 uint8_t *do_not_decode,
1316 unsigned ch_used,
1317 int partition_count,
1318 int ptns_to_read
1319 )
1320 {
1321 int p, j, i;
1322 unsigned c_p_c = vc->codebooks[vr->classbook].dimensions;
1323 unsigned inverse_class = ff_inverse[vr->classifications];
1324 unsigned temp, temp2;
1325 for (p = 0, j = 0; j < ch_used; ++j) {
1326 if (!do_not_decode[j]) {
1327 temp = get_vlc2(&vc->gb, vc->codebooks[vr->classbook].vlc.table,
1328 vc->codebooks[vr->classbook].nb_bits, 3);
1329
1330 av_dlog(NULL, "Classword: %u\n", temp);
1331
1332 if ((int)temp < 0)
1333 return temp;
1334
1335 av_assert0(vr->classifications > 1); //needed for inverse[]
1336
1337 if (temp <= 65536) {
1338 for (i = partition_count + c_p_c - 1; i >= partition_count; i--) {
1339 temp2 = (((uint64_t)temp) * inverse_class) >> 32;
1340
1341 if (i < ptns_to_read)
1342 vr->classifs[p + i] = temp - temp2 * vr->classifications;
1343 temp = temp2;
1344 }
1345 } else {
1346 for (i = partition_count + c_p_c - 1; i >= partition_count; i--) {
1347 temp2 = temp / vr->classifications;
1348
1349 if (i < ptns_to_read)
1350 vr->classifs[p + i] = temp - temp2 * vr->classifications;
1351 temp = temp2;
1352 }
1353 }
1354 }
1355 p += ptns_to_read;
1356 }
1357 return 0;
1358 }
1359 // Read and decode residue
1360
vorbis_residue_decode_internal(vorbis_context * vc,vorbis_residue * vr,unsigned ch,uint8_t * do_not_decode,float * vec,unsigned vlen,unsigned ch_left,int vr_type)1361 static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc,
1362 vorbis_residue *vr,
1363 unsigned ch,
1364 uint8_t *do_not_decode,
1365 float *vec,
1366 unsigned vlen,
1367 unsigned ch_left,
1368 int vr_type)
1369 {
1370 GetBitContext *gb = &vc->gb;
1371 unsigned c_p_c = vc->codebooks[vr->classbook].dimensions;
1372 uint8_t *classifs = vr->classifs;
1373 unsigned pass, ch_used, i, j, k, l;
1374 unsigned max_output = (ch - 1) * vlen;
1375 int ptns_to_read = vr->ptns_to_read;
1376 int libvorbis_bug = 0;
1377
1378 if (vr_type == 2) {
1379 for (j = 1; j < ch; ++j)
1380 do_not_decode[0] &= do_not_decode[j]; // FIXME - clobbering input
1381 if (do_not_decode[0])
1382 return 0;
1383 ch_used = 1;
1384 max_output += vr->end / ch;
1385 } else {
1386 ch_used = ch;
1387 max_output += vr->end;
1388 }
1389
1390 if (max_output > ch_left * vlen) {
1391 if (max_output <= ch_left * vlen + vr->partition_size*ch_used/ch) {
1392 ptns_to_read--;
1393 libvorbis_bug = 1;
1394 } else {
1395 av_log(vc->avctx, AV_LOG_ERROR, "Insufficient output buffer\n");
1396 return AVERROR_INVALIDDATA;
1397 }
1398 }
1399
1400 av_dlog(NULL, " residue type 0/1/2 decode begin, ch: %d cpc %d \n", ch, c_p_c);
1401
1402 for (pass = 0; pass <= vr->maxpass; ++pass) { // FIXME OPTIMIZE?
1403 int voffset, partition_count, j_times_ptns_to_read;
1404
1405 voffset = vr->begin;
1406 for (partition_count = 0; partition_count < ptns_to_read;) { // SPEC error
1407 if (!pass) {
1408 int ret;
1409 if ((ret = setup_classifs(vc, vr, do_not_decode, ch_used, partition_count, ptns_to_read)) < 0)
1410 return ret;
1411 }
1412 for (i = 0; (i < c_p_c) && (partition_count < ptns_to_read); ++i) {
1413 for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {
1414 unsigned voffs;
1415
1416 if (!do_not_decode[j]) {
1417 unsigned vqclass = classifs[j_times_ptns_to_read + partition_count];
1418 int vqbook = vr->books[vqclass][pass];
1419
1420 if (vqbook >= 0 && vc->codebooks[vqbook].codevectors) {
1421 unsigned coffs;
1422 unsigned dim = vc->codebooks[vqbook].dimensions;
1423 unsigned step = FASTDIV(vr->partition_size << 1, dim << 1);
1424 vorbis_codebook codebook = vc->codebooks[vqbook];
1425
1426 if (vr_type == 0) {
1427
1428 voffs = voffset+j*vlen;
1429 for (k = 0; k < step; ++k) {
1430 coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1431 for (l = 0; l < dim; ++l)
1432 vec[voffs + k + l * step] += codebook.codevectors[coffs + l];
1433 }
1434 } else if (vr_type == 1) {
1435 voffs = voffset + j * vlen;
1436 for (k = 0; k < step; ++k) {
1437 coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1438 for (l = 0; l < dim; ++l, ++voffs) {
1439 vec[voffs]+=codebook.codevectors[coffs+l];
1440
1441 av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d \n",
1442 pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);
1443 }
1444 }
1445 } else if (vr_type == 2 && ch == 2 && (voffset & 1) == 0 && (dim & 1) == 0) { // most frequent case optimized
1446 voffs = voffset >> 1;
1447
1448 if (dim == 2) {
1449 for (k = 0; k < step; ++k) {
1450 coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;
1451 vec[voffs + k ] += codebook.codevectors[coffs ];
1452 vec[voffs + k + vlen] += codebook.codevectors[coffs + 1];
1453 }
1454 } else if (dim == 4) {
1455 for (k = 0; k < step; ++k, voffs += 2) {
1456 coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4;
1457 vec[voffs ] += codebook.codevectors[coffs ];
1458 vec[voffs + 1 ] += codebook.codevectors[coffs + 2];
1459 vec[voffs + vlen ] += codebook.codevectors[coffs + 1];
1460 vec[voffs + vlen + 1] += codebook.codevectors[coffs + 3];
1461 }
1462 } else
1463 for (k = 0; k < step; ++k) {
1464 coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1465 for (l = 0; l < dim; l += 2, voffs++) {
1466 vec[voffs ] += codebook.codevectors[coffs + l ];
1467 vec[voffs + vlen] += codebook.codevectors[coffs + l + 1];
1468
1469 av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d+%d \n",
1470 pass, voffset / ch + (voffs % ch) * vlen,
1471 vec[voffset / ch + (voffs % ch) * vlen],
1472 codebook.codevectors[coffs + l], coffs, l);
1473 }
1474 }
1475
1476 } else if (vr_type == 2) {
1477 unsigned voffs_div = FASTDIV(voffset << 1, ch <<1);
1478 unsigned voffs_mod = voffset - voffs_div * ch;
1479
1480 for (k = 0; k < step; ++k) {
1481 coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1482 for (l = 0; l < dim; ++l) {
1483 vec[voffs_div + voffs_mod * vlen] +=
1484 codebook.codevectors[coffs + l];
1485
1486 av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d+%d \n",
1487 pass, voffs_div + voffs_mod * vlen,
1488 vec[voffs_div + voffs_mod * vlen],
1489 codebook.codevectors[coffs + l], coffs, l);
1490
1491 if (++voffs_mod == ch) {
1492 voffs_div++;
1493 voffs_mod = 0;
1494 }
1495 }
1496 }
1497 }
1498 }
1499 }
1500 j_times_ptns_to_read += ptns_to_read;
1501 }
1502 ++partition_count;
1503 voffset += vr->partition_size;
1504 }
1505 }
1506 if (libvorbis_bug && !pass) {
1507 for (j = 0; j < ch_used; ++j) {
1508 if (!do_not_decode[j]) {
1509 get_vlc2(&vc->gb, vc->codebooks[vr->classbook].vlc.table,
1510 vc->codebooks[vr->classbook].nb_bits, 3);
1511 }
1512 }
1513 }
1514 }
1515 return 0;
1516 }
1517
vorbis_residue_decode(vorbis_context * vc,vorbis_residue * vr,unsigned ch,uint8_t * do_not_decode,float * vec,unsigned vlen,unsigned ch_left)1518 static inline int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr,
1519 unsigned ch,
1520 uint8_t *do_not_decode,
1521 float *vec, unsigned vlen,
1522 unsigned ch_left)
1523 {
1524 if (vr->type == 2)
1525 return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 2);
1526 else if (vr->type == 1)
1527 return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 1);
1528 else if (vr->type == 0)
1529 return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 0);
1530 else {
1531 av_log(vc->avctx, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");
1532 return AVERROR_INVALIDDATA;
1533 }
1534 }
1535
ff_vorbis_inverse_coupling(float * mag,float * ang,intptr_t blocksize)1536 void ff_vorbis_inverse_coupling(float *mag, float *ang, intptr_t blocksize)
1537 {
1538 int i;
1539 for (i = 0; i < blocksize; i++) {
1540 if (mag[i] > 0.0) {
1541 if (ang[i] > 0.0) {
1542 ang[i] = mag[i] - ang[i];
1543 } else {
1544 float temp = ang[i];
1545 ang[i] = mag[i];
1546 mag[i] += temp;
1547 }
1548 } else {
1549 if (ang[i] > 0.0) {
1550 ang[i] += mag[i];
1551 } else {
1552 float temp = ang[i];
1553 ang[i] = mag[i];
1554 mag[i] -= temp;
1555 }
1556 }
1557 }
1558 }
1559
1560 // Decode the audio packet using the functions above
1561
vorbis_parse_audio_packet(vorbis_context * vc,float ** floor_ptr)1562 static int vorbis_parse_audio_packet(vorbis_context *vc, float **floor_ptr)
1563 {
1564 GetBitContext *gb = &vc->gb;
1565 FFTContext *mdct;
1566 int previous_window = vc->previous_window;
1567 unsigned mode_number, blockflag, blocksize;
1568 int i, j;
1569 uint8_t no_residue[255];
1570 uint8_t do_not_decode[255];
1571 vorbis_mapping *mapping;
1572 float *ch_res_ptr = vc->channel_residues;
1573 uint8_t res_chan[255];
1574 unsigned res_num = 0;
1575 int retlen = 0;
1576 unsigned ch_left = vc->audio_channels;
1577 unsigned vlen;
1578
1579 if (get_bits1(gb)) {
1580 av_log(vc->avctx, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");
1581 return AVERROR_INVALIDDATA; // packet type not audio
1582 }
1583
1584 if (vc->mode_count == 1) {
1585 mode_number = 0;
1586 } else {
1587 GET_VALIDATED_INDEX(mode_number, ilog(vc->mode_count-1), vc->mode_count)
1588 }
1589 vc->mode_number = mode_number;
1590 mapping = &vc->mappings[vc->modes[mode_number].mapping];
1591
1592 av_dlog(NULL, " Mode number: %u , mapping: %d , blocktype %d\n", mode_number,
1593 vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);
1594
1595 blockflag = vc->modes[mode_number].blockflag;
1596 blocksize = vc->blocksize[blockflag];
1597 vlen = blocksize / 2;
1598 if (blockflag) {
1599 int code = get_bits(gb, 2);
1600 if (previous_window < 0)
1601 previous_window = code>>1;
1602 } else if (previous_window < 0)
1603 previous_window = 0;
1604
1605 memset(ch_res_ptr, 0, sizeof(float) * vc->audio_channels * vlen); //FIXME can this be removed ?
1606 for (i = 0; i < vc->audio_channels; ++i)
1607 memset(floor_ptr[i], 0, vlen * sizeof(floor_ptr[0][0])); //FIXME can this be removed ?
1608
1609 // Decode floor
1610
1611 for (i = 0; i < vc->audio_channels; ++i) {
1612 vorbis_floor *floor;
1613 int ret;
1614 if (mapping->submaps > 1) {
1615 floor = &vc->floors[mapping->submap_floor[mapping->mux[i]]];
1616 } else {
1617 floor = &vc->floors[mapping->submap_floor[0]];
1618 }
1619
1620 ret = floor->decode(vc, &floor->data, floor_ptr[i]);
1621
1622 if (ret < 0) {
1623 av_log(vc->avctx, AV_LOG_ERROR, "Invalid codebook in vorbis_floor_decode.\n");
1624 return AVERROR_INVALIDDATA;
1625 }
1626 no_residue[i] = ret;
1627 }
1628
1629 // Nonzero vector propagate
1630
1631 for (i = mapping->coupling_steps - 1; i >= 0; --i) {
1632 if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {
1633 no_residue[mapping->magnitude[i]] = 0;
1634 no_residue[mapping->angle[i]] = 0;
1635 }
1636 }
1637
1638 // Decode residue
1639
1640 for (i = 0; i < mapping->submaps; ++i) {
1641 vorbis_residue *residue;
1642 unsigned ch = 0;
1643 int ret;
1644
1645 for (j = 0; j < vc->audio_channels; ++j) {
1646 if ((mapping->submaps == 1) || (i == mapping->mux[j])) {
1647 res_chan[j] = res_num;
1648 if (no_residue[j]) {
1649 do_not_decode[ch] = 1;
1650 } else {
1651 do_not_decode[ch] = 0;
1652 }
1653 ++ch;
1654 ++res_num;
1655 }
1656 }
1657 residue = &vc->residues[mapping->submap_residue[i]];
1658 if (ch_left < ch) {
1659 av_log(vc->avctx, AV_LOG_ERROR, "Too many channels in vorbis_floor_decode.\n");
1660 return AVERROR_INVALIDDATA;
1661 }
1662 if (ch) {
1663 ret = vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, vlen, ch_left);
1664 if (ret < 0)
1665 return ret;
1666 }
1667
1668 ch_res_ptr += ch * vlen;
1669 ch_left -= ch;
1670 }
1671
1672 if (ch_left > 0)
1673 return AVERROR_INVALIDDATA;
1674
1675 // Inverse coupling
1676
1677 for (i = mapping->coupling_steps - 1; i >= 0; --i) { //warning: i has to be signed
1678 float *mag, *ang;
1679
1680 mag = vc->channel_residues+res_chan[mapping->magnitude[i]] * blocksize / 2;
1681 ang = vc->channel_residues+res_chan[mapping->angle[i]] * blocksize / 2;
1682 vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize / 2);
1683 }
1684
1685 // Dotproduct, MDCT
1686
1687 mdct = &vc->mdct[blockflag];
1688
1689 for (j = vc->audio_channels-1;j >= 0; j--) {
1690 ch_res_ptr = vc->channel_residues + res_chan[j] * blocksize / 2;
1691 vc->fdsp.vector_fmul(floor_ptr[j], floor_ptr[j], ch_res_ptr, blocksize / 2);
1692 mdct->imdct_half(mdct, ch_res_ptr, floor_ptr[j]);
1693 }
1694
1695 // Overlap/add, save data for next overlapping
1696
1697 retlen = (blocksize + vc->blocksize[previous_window]) / 4;
1698 for (j = 0; j < vc->audio_channels; j++) {
1699 unsigned bs0 = vc->blocksize[0];
1700 unsigned bs1 = vc->blocksize[1];
1701 float *residue = vc->channel_residues + res_chan[j] * blocksize / 2;
1702 float *saved = vc->saved + j * bs1 / 4;
1703 float *ret = floor_ptr[j];
1704 float *buf = residue;
1705 const float *win = vc->win[blockflag & previous_window];
1706
1707 if (blockflag == previous_window) {
1708 vc->fdsp.vector_fmul_window(ret, saved, buf, win, blocksize / 4);
1709 } else if (blockflag > previous_window) {
1710 vc->fdsp.vector_fmul_window(ret, saved, buf, win, bs0 / 4);
1711 memcpy(ret+bs0/2, buf+bs0/4, ((bs1-bs0)/4) * sizeof(float));
1712 } else {
1713 memcpy(ret, saved, ((bs1 - bs0) / 4) * sizeof(float));
1714 vc->fdsp.vector_fmul_window(ret + (bs1 - bs0) / 4, saved + (bs1 - bs0) / 4, buf, win, bs0 / 4);
1715 }
1716 memcpy(saved, buf + blocksize / 4, blocksize / 4 * sizeof(float));
1717 }
1718
1719 vc->previous_window = blockflag;
1720 return retlen;
1721 }
1722
1723 // Return the decoded audio packet through the standard api
1724
vorbis_decode_frame(AVCodecContext * avctx,void * data,int * got_frame_ptr,AVPacket * avpkt)1725 static int vorbis_decode_frame(AVCodecContext *avctx, void *data,
1726 int *got_frame_ptr, AVPacket *avpkt)
1727 {
1728 const uint8_t *buf = avpkt->data;
1729 int buf_size = avpkt->size;
1730 vorbis_context *vc = avctx->priv_data;
1731 AVFrame *frame = data;
1732 GetBitContext *gb = &vc->gb;
1733 float *channel_ptrs[255];
1734 int i, len, ret;
1735
1736 av_dlog(NULL, "packet length %d \n", buf_size);
1737
1738 if (*buf == 1 && buf_size > 7) {
1739 init_get_bits(gb, buf+1, buf_size*8 - 8);
1740 vorbis_free(vc);
1741 if ((ret = vorbis_parse_id_hdr(vc))) {
1742 av_log(avctx, AV_LOG_ERROR, "Id header corrupt.\n");
1743 vorbis_free(vc);
1744 return ret;
1745 }
1746
1747 if (vc->audio_channels > 8)
1748 avctx->channel_layout = 0;
1749 else
1750 avctx->channel_layout = ff_vorbis_channel_layouts[vc->audio_channels - 1];
1751
1752 avctx->channels = vc->audio_channels;
1753 avctx->sample_rate = vc->audio_samplerate;
1754 return buf_size;
1755 }
1756
1757 if (*buf == 3 && buf_size > 7) {
1758 av_log(avctx, AV_LOG_DEBUG, "Ignoring comment header\n");
1759 return buf_size;
1760 }
1761
1762 if (*buf == 5 && buf_size > 7 && vc->channel_residues && !vc->modes) {
1763 init_get_bits(gb, buf+1, buf_size*8 - 8);
1764 if ((ret = vorbis_parse_setup_hdr(vc))) {
1765 av_log(avctx, AV_LOG_ERROR, "Setup header corrupt.\n");
1766 vorbis_free(vc);
1767 return ret;
1768 }
1769 return buf_size;
1770 }
1771
1772 if (!vc->channel_residues || !vc->modes) {
1773 av_log(avctx, AV_LOG_ERROR, "Data packet before valid headers\n");
1774 return AVERROR_INVALIDDATA;
1775 }
1776
1777 /* get output buffer */
1778 frame->nb_samples = vc->blocksize[1] / 2;
1779 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
1780 return ret;
1781
1782 if (vc->audio_channels > 8) {
1783 for (i = 0; i < vc->audio_channels; i++)
1784 channel_ptrs[i] = (float *)frame->extended_data[i];
1785 } else {
1786 for (i = 0; i < vc->audio_channels; i++) {
1787 int ch = ff_vorbis_channel_layout_offsets[vc->audio_channels - 1][i];
1788 channel_ptrs[ch] = (float *)frame->extended_data[i];
1789 }
1790 }
1791
1792 init_get_bits(gb, buf, buf_size*8);
1793
1794 if ((len = vorbis_parse_audio_packet(vc, channel_ptrs)) <= 0)
1795 return len;
1796
1797 if (!vc->first_frame) {
1798 vc->first_frame = 1;
1799 *got_frame_ptr = 0;
1800 av_frame_unref(frame);
1801 return buf_size;
1802 }
1803
1804 av_dlog(NULL, "parsed %d bytes %d bits, returned %d samples (*ch*bits) \n",
1805 get_bits_count(gb) / 8, get_bits_count(gb) % 8, len);
1806
1807 frame->nb_samples = len;
1808 *got_frame_ptr = 1;
1809
1810 return buf_size;
1811 }
1812
1813 // Close decoder
1814
vorbis_decode_close(AVCodecContext * avctx)1815 static av_cold int vorbis_decode_close(AVCodecContext *avctx)
1816 {
1817 vorbis_context *vc = avctx->priv_data;
1818
1819 vorbis_free(vc);
1820
1821 return 0;
1822 }
1823
vorbis_decode_flush(AVCodecContext * avctx)1824 static av_cold void vorbis_decode_flush(AVCodecContext *avctx)
1825 {
1826 vorbis_context *vc = avctx->priv_data;
1827
1828 if (vc->saved) {
1829 memset(vc->saved, 0, (vc->blocksize[1] / 4) * vc->audio_channels *
1830 sizeof(*vc->saved));
1831 }
1832 vc->previous_window = -1;
1833 vc->first_frame = 0;
1834 }
1835
1836 AVCodec ff_vorbis_decoder = {
1837 .name = "vorbis",
1838 .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),
1839 .type = AVMEDIA_TYPE_AUDIO,
1840 .id = AV_CODEC_ID_VORBIS,
1841 .priv_data_size = sizeof(vorbis_context),
1842 .init = vorbis_decode_init,
1843 .close = vorbis_decode_close,
1844 .decode = vorbis_decode_frame,
1845 .flush = vorbis_decode_flush,
1846 .capabilities = CODEC_CAP_DR1,
1847 .channel_layouts = ff_vorbis_channel_layouts,
1848 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
1849 AV_SAMPLE_FMT_NONE },
1850 };
1851