?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Vertical align.
[ffmpeg-lucabe.git] / libavcodec / vorbis_dec.c
blobb8e663281d96399fc05deae228fbb45d121e0fd9
1 /**
2 * @file libavcodec/vorbis_dec.c
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 #undef V_DEBUG
24 //#define V_DEBUG
25 //#define AV_DEBUG(...) av_log(NULL, AV_LOG_INFO, __VA_ARGS__)
26
27 #include <math.h>
28
29 #define ALT_BITSTREAM_READER_LE
30 #include "avcodec.h"
31 #include "get_bits.h"
32 #include "dsputil.h"
33
34 #include "vorbis.h"
35 #include "xiph.h"
36
37 #define V_NB_BITS 8
38 #define V_NB_BITS2 11
39 #define V_MAX_VLCS (1 << 16)
40 #define V_MAX_PARTITIONS (1 << 20)
41
42 #ifndef V_DEBUG
43 #define AV_DEBUG(...)
44 #endif
45
46 #undef NDEBUG
47 #include <assert.h>
48
49 typedef struct {
50 uint_fast8_t dimensions;
51 uint_fast8_t lookup_type;
52 uint_fast8_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 uint_fast8_t (* vorbis_floor_decode_func)
64 (struct vorbis_context_s *, vorbis_floor_data *, float *);
65 typedef struct {
66 uint_fast8_t floor_type;
67 vorbis_floor_decode_func decode;
68 union vorbis_floor_u {
69 struct vorbis_floor0_s {
70 uint_fast8_t order;
71 uint_fast16_t rate;
72 uint_fast16_t bark_map_size;
73 int_fast32_t *map[2];
74 uint_fast32_t map_size[2];
75 uint_fast8_t amplitude_bits;
76 uint_fast8_t amplitude_offset;
77 uint_fast8_t num_books;
78 uint_fast8_t *book_list;
79 float *lsp;
80 } t0;
81 struct vorbis_floor1_s {
82 uint_fast8_t partitions;
83 uint_fast8_t maximum_class;
84 uint_fast8_t partition_class[32];
85 uint_fast8_t class_dimensions[16];
86 uint_fast8_t class_subclasses[16];
87 uint_fast8_t class_masterbook[16];
88 int_fast16_t subclass_books[16][8];
89 uint_fast8_t multiplier;
90 uint_fast16_t x_list_dim;
91 vorbis_floor1_entry *list;
92 } t1;
93 } data;
94 } vorbis_floor;
95
96 typedef struct {
97 uint_fast16_t type;
98 uint_fast32_t begin;
99 uint_fast32_t end;
100 uint_fast32_t partition_size;
101 uint_fast8_t classifications;
102 uint_fast8_t classbook;
103 int_fast16_t books[64][8];
104 uint_fast8_t maxpass;
105 } vorbis_residue;
106
107 typedef struct {
108 uint_fast8_t submaps;
109 uint_fast16_t coupling_steps;
110 uint_fast8_t *magnitude;
111 uint_fast8_t *angle;
112 uint_fast8_t *mux;
113 uint_fast8_t submap_floor[16];
114 uint_fast8_t submap_residue[16];
115 } vorbis_mapping;
116
117 typedef struct {
118 uint_fast8_t blockflag;
119 uint_fast16_t windowtype;
120 uint_fast16_t transformtype;
121 uint_fast8_t mapping;
122 } vorbis_mode;
123
124 typedef struct vorbis_context_s {
125 AVCodecContext *avccontext;
126 GetBitContext gb;
127 DSPContext dsp;
128
129 FFTContext mdct[2];
130 uint_fast8_t first_frame;
131 uint_fast32_t version;
132 uint_fast8_t audio_channels;
133 uint_fast32_t audio_samplerate;
134 uint_fast32_t bitrate_maximum;
135 uint_fast32_t bitrate_nominal;
136 uint_fast32_t bitrate_minimum;
137 uint_fast32_t blocksize[2];
138 const float *win[2];
139 uint_fast16_t codebook_count;
140 vorbis_codebook *codebooks;
141 uint_fast8_t floor_count;
142 vorbis_floor *floors;
143 uint_fast8_t residue_count;
144 vorbis_residue *residues;
145 uint_fast8_t mapping_count;
146 vorbis_mapping *mappings;
147 uint_fast8_t mode_count;
148 vorbis_mode *modes;
149 uint_fast8_t mode_number; // mode number for the current packet
150 uint_fast8_t previous_window;
151 float *channel_residues;
152 float *channel_floors;
153 float *saved;
154 uint_fast32_t add_bias; // for float->int conversion
155 uint_fast32_t exp_bias;
156 } vorbis_context;
157
158 /* Helper functions */
159
160 #define BARK(x) \
161 (13.1f * atan(0.00074f * (x)) + 2.24f * atan(1.85e-8f * (x) * (x)) + 1e-4f * (x))
162
163 static const char idx_err_str[] = "Index value %d out of range (0 - %d) for %s at %s:%i\n";
164 #define VALIDATE_INDEX(idx, limit) \
165 if (idx >= limit) {\
166 av_log(vc->avccontext, AV_LOG_ERROR,\
167 idx_err_str,\
168 (int)(idx), (int)(limit - 1), #idx, __FILE__, __LINE__);\
169 return -1;\
170 }
171 #define GET_VALIDATED_INDEX(idx, bits, limit) \
172 {\
173 idx = get_bits(gb, bits);\
174 VALIDATE_INDEX(idx, limit)\
175 }
176
177 static float vorbisfloat2float(uint_fast32_t val)
178 {
179 double mant = val & 0x1fffff;
180 long exp = (val & 0x7fe00000L) >> 21;
181 if (val & 0x80000000)
182 mant = -mant;
183 return ldexp(mant, exp - 20 - 768);
184 }
185
186
187 // Free all allocated memory -----------------------------------------
188
189 static void vorbis_free(vorbis_context *vc)
190 {
191 int_fast16_t i;
192
193 av_freep(&vc->channel_residues);
194 av_freep(&vc->channel_floors);
195 av_freep(&vc->saved);
196
197 av_freep(&vc->residues);
198 av_freep(&vc->modes);
199
200 ff_mdct_end(&vc->mdct[0]);
201 ff_mdct_end(&vc->mdct[1]);
202
203 for (i = 0; i < vc->codebook_count; ++i) {
204 av_free(vc->codebooks[i].codevectors);
205 free_vlc(&vc->codebooks[i].vlc);
206 }
207 av_freep(&vc->codebooks);
208
209 for (i = 0; i < vc->floor_count; ++i) {
210 if (vc->floors[i].floor_type == 0) {
211 av_free(vc->floors[i].data.t0.map[0]);
212 av_free(vc->floors[i].data.t0.map[1]);
213 av_free(vc->floors[i].data.t0.book_list);
214 av_free(vc->floors[i].data.t0.lsp);
215 } else {
216 av_free(vc->floors[i].data.t1.list);
217 }
218 }
219 av_freep(&vc->floors);
220
221 for (i = 0; i < vc->mapping_count; ++i) {
222 av_free(vc->mappings[i].magnitude);
223 av_free(vc->mappings[i].angle);
224 av_free(vc->mappings[i].mux);
225 }
226 av_freep(&vc->mappings);
227 }
228
229 // Parse setup header -------------------------------------------------
230
231 // Process codebooks part
232
233 static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc)
234 {
235 uint_fast16_t cb;
236 uint8_t *tmp_vlc_bits;
237 uint32_t *tmp_vlc_codes;
238 GetBitContext *gb = &vc->gb;
239
240 vc->codebook_count = get_bits(gb, 8) + 1;
241
242 AV_DEBUG(" Codebooks: %d \n", vc->codebook_count);
243
244 vc->codebooks = av_mallocz(vc->codebook_count * sizeof(vorbis_codebook));
245 tmp_vlc_bits = av_mallocz(V_MAX_VLCS * sizeof(uint8_t));
246 tmp_vlc_codes = av_mallocz(V_MAX_VLCS * sizeof(uint32_t));
247
248 for (cb = 0; cb < vc->codebook_count; ++cb) {
249 vorbis_codebook *codebook_setup = &vc->codebooks[cb];
250 uint_fast8_t ordered;
251 uint_fast32_t t, used_entries = 0;
252 uint_fast32_t entries;
253
254 AV_DEBUG(" %d. Codebook \n", cb);
255
256 if (get_bits(gb, 24) != 0x564342) {
257 av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook setup data corrupt. \n", cb);
258 goto error;
259 }
260
261 codebook_setup->dimensions=get_bits(gb, 16);
262 if (codebook_setup->dimensions > 16 || codebook_setup->dimensions == 0) {
263 av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook's dimension is invalid (%d). \n", cb, codebook_setup->dimensions);
264 goto error;
265 }
266 entries = get_bits(gb, 24);
267 if (entries > V_MAX_VLCS) {
268 av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook has too many entries (%"PRIdFAST32"). \n", cb, entries);
269 goto error;
270 }
271
272 ordered = get_bits1(gb);
273
274 AV_DEBUG(" codebook_dimensions %d, codebook_entries %d \n", codebook_setup->dimensions, entries);
275
276 if (!ordered) {
277 uint_fast16_t ce;
278 uint_fast8_t flag;
279 uint_fast8_t sparse = get_bits1(gb);
280
281 AV_DEBUG(" not ordered \n");
282
283 if (sparse) {
284 AV_DEBUG(" sparse \n");
285
286 used_entries = 0;
287 for (ce = 0; ce < entries; ++ce) {
288 flag = get_bits1(gb);
289 if (flag) {
290 tmp_vlc_bits[ce] = get_bits(gb, 5) + 1;
291 ++used_entries;
292 } else
293 tmp_vlc_bits[ce] = 0;
294 }
295 } else {
296 AV_DEBUG(" not sparse \n");
297
298 used_entries = entries;
299 for (ce = 0; ce < entries; ++ce)
300 tmp_vlc_bits[ce] = get_bits(gb, 5) + 1;
301 }
302 } else {
303 uint_fast16_t current_entry = 0;
304 uint_fast8_t current_length = get_bits(gb, 5)+1;
305
306 AV_DEBUG(" ordered, current length: %d \n", current_length); //FIXME
307
308 used_entries = entries;
309 for (; current_entry < used_entries && current_length <= 32; ++current_length) {
310 uint_fast16_t i, number;
311
312 AV_DEBUG(" number bits: %d ", ilog(entries - current_entry));
313
314 number = get_bits(gb, ilog(entries - current_entry));
315
316 AV_DEBUG(" number: %d \n", number);
317
318 for (i = current_entry; i < number+current_entry; ++i)
319 if (i < used_entries)
320 tmp_vlc_bits[i] = current_length;
321
322 current_entry+=number;
323 }
324 if (current_entry>used_entries) {
325 av_log(vc->avccontext, AV_LOG_ERROR, " More codelengths than codes in codebook. \n");
326 goto error;
327 }
328 }
329
330 codebook_setup->lookup_type = get_bits(gb, 4);
331
332 AV_DEBUG(" lookup type: %d : %s \n", codebook_setup->lookup_type, codebook_setup->lookup_type ? "vq" : "no lookup");
333
334 // If the codebook is used for (inverse) VQ, calculate codevectors.
335
336 if (codebook_setup->lookup_type == 1) {
337 uint_fast16_t i, j, k;
338 uint_fast16_t codebook_lookup_values = ff_vorbis_nth_root(entries, codebook_setup->dimensions);
339 uint_fast16_t codebook_multiplicands[codebook_lookup_values];
340
341 float codebook_minimum_value = vorbisfloat2float(get_bits_long(gb, 32));
342 float codebook_delta_value = vorbisfloat2float(get_bits_long(gb, 32));
343 uint_fast8_t codebook_value_bits = get_bits(gb, 4)+1;
344 uint_fast8_t codebook_sequence_p = get_bits1(gb);
345
346 AV_DEBUG(" We expect %d numbers for building the codevectors. \n", codebook_lookup_values);
347 AV_DEBUG(" delta %f minmum %f \n", codebook_delta_value, codebook_minimum_value);
348
349 for (i = 0; i < codebook_lookup_values; ++i) {
350 codebook_multiplicands[i] = get_bits(gb, codebook_value_bits);
351
352 AV_DEBUG(" multiplicands*delta+minmum : %e \n", (float)codebook_multiplicands[i]*codebook_delta_value+codebook_minimum_value);
353 AV_DEBUG(" multiplicand %d \n", codebook_multiplicands[i]);
354 }
355
356 // Weed out unused vlcs and build codevector vector
357 codebook_setup->codevectors = used_entries ? av_mallocz(used_entries*codebook_setup->dimensions * sizeof(float)) : NULL;
358 for (j = 0, i = 0; i < entries; ++i) {
359 uint_fast8_t dim = codebook_setup->dimensions;
360
361 if (tmp_vlc_bits[i]) {
362 float last = 0.0;
363 uint_fast32_t lookup_offset = i;
364
365 #ifdef V_DEBUG
366 av_log(vc->avccontext, AV_LOG_INFO, "Lookup offset %d ,", i);
367 #endif
368
369 for (k = 0; k < dim; ++k) {
370 uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values;
371 codebook_setup->codevectors[j * dim + k] = codebook_multiplicands[multiplicand_offset] * codebook_delta_value + codebook_minimum_value + last;
372 if (codebook_sequence_p)
373 last = codebook_setup->codevectors[j * dim + k];
374 lookup_offset/=codebook_lookup_values;
375 }
376 tmp_vlc_bits[j] = tmp_vlc_bits[i];
377
378 #ifdef V_DEBUG
379 av_log(vc->avccontext, AV_LOG_INFO, "real lookup offset %d, vector: ", j);
380 for (k = 0; k < dim; ++k)
381 av_log(vc->avccontext, AV_LOG_INFO, " %f ", codebook_setup->codevectors[j * dim + k]);
382 av_log(vc->avccontext, AV_LOG_INFO, "\n");
383 #endif
384
385 ++j;
386 }
387 }
388 if (j != used_entries) {
389 av_log(vc->avccontext, AV_LOG_ERROR, "Bug in codevector vector building code. \n");
390 goto error;
391 }
392 entries = used_entries;
393 } else if (codebook_setup->lookup_type >= 2) {
394 av_log(vc->avccontext, AV_LOG_ERROR, "Codebook lookup type not supported. \n");
395 goto error;
396 }
397
398 // Initialize VLC table
399 if (ff_vorbis_len2vlc(tmp_vlc_bits, tmp_vlc_codes, entries)) {
400 av_log(vc->avccontext, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");
401 goto error;
402 }
403 codebook_setup->maxdepth = 0;
404 for (t = 0; t < entries; ++t)
405 if (tmp_vlc_bits[t] >= codebook_setup->maxdepth)
406 codebook_setup->maxdepth = tmp_vlc_bits[t];
407
408 if (codebook_setup->maxdepth > 3 * V_NB_BITS)
409 codebook_setup->nb_bits = V_NB_BITS2;
410 else
411 codebook_setup->nb_bits = V_NB_BITS;
412
413 codebook_setup->maxdepth = (codebook_setup->maxdepth+codebook_setup->nb_bits - 1) / codebook_setup->nb_bits;
414
415 if (init_vlc(&codebook_setup->vlc, codebook_setup->nb_bits, entries, tmp_vlc_bits, sizeof(*tmp_vlc_bits), sizeof(*tmp_vlc_bits), tmp_vlc_codes, sizeof(*tmp_vlc_codes), sizeof(*tmp_vlc_codes), INIT_VLC_LE)) {
416 av_log(vc->avccontext, AV_LOG_ERROR, " Error generating vlc tables. \n");
417 goto error;
418 }
419 }
420
421 av_free(tmp_vlc_bits);
422 av_free(tmp_vlc_codes);
423 return 0;
424
425 // Error:
426 error:
427 av_free(tmp_vlc_bits);
428 av_free(tmp_vlc_codes);
429 return -1;
430 }
431
432 // Process time domain transforms part (unused in Vorbis I)
433
434 static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc)
435 {
436 GetBitContext *gb = &vc->gb;
437 uint_fast8_t i;
438 uint_fast8_t vorbis_time_count = get_bits(gb, 6) + 1;
439
440 for (i = 0; i < vorbis_time_count; ++i) {
441 uint_fast16_t vorbis_tdtransform = get_bits(gb, 16);
442
443 AV_DEBUG(" Vorbis time domain transform %d: %d \n", vorbis_time_count, vorbis_tdtransform);
444
445 if (vorbis_tdtransform) {
446 av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n");
447 return -1;
448 }
449 }
450 return 0;
451 }
452
453 // Process floors part
454
455 static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,
456 vorbis_floor_data *vfu, float *vec);
457 static void create_map(vorbis_context *vc, uint_fast8_t floor_number);
458 static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc,
459 vorbis_floor_data *vfu, float *vec);
460 static int vorbis_parse_setup_hdr_floors(vorbis_context *vc)
461 {
462 GetBitContext *gb = &vc->gb;
463 uint_fast16_t i,j,k;
464
465 vc->floor_count = get_bits(gb, 6) + 1;
466
467 vc->floors = av_mallocz(vc->floor_count * sizeof(vorbis_floor));
468
469 for (i = 0; i < vc->floor_count; ++i) {
470 vorbis_floor *floor_setup = &vc->floors[i];
471
472 floor_setup->floor_type = get_bits(gb, 16);
473
474 AV_DEBUG(" %d. floor type %d \n", i, floor_setup->floor_type);
475
476 if (floor_setup->floor_type == 1) {
477 uint_fast8_t maximum_class = 0;
478 uint_fast8_t rangebits;
479 uint_fast16_t floor1_values = 2;
480
481 floor_setup->decode = vorbis_floor1_decode;
482
483 floor_setup->data.t1.partitions = get_bits(gb, 5);
484
485 AV_DEBUG(" %d.floor: %d partitions \n", i, floor_setup->data.t1.partitions);
486
487 for (j = 0; j < floor_setup->data.t1.partitions; ++j) {
488 floor_setup->data.t1.partition_class[j] = get_bits(gb, 4);
489 if (floor_setup->data.t1.partition_class[j] > maximum_class)
490 maximum_class = floor_setup->data.t1.partition_class[j];
491
492 AV_DEBUG(" %d. floor %d partition class %d \n", i, j, floor_setup->data.t1.partition_class[j]);
493
494 }
495
496 AV_DEBUG(" maximum class %d \n", maximum_class);
497
498 floor_setup->data.t1.maximum_class = maximum_class;
499
500 for (j = 0; j <= maximum_class; ++j) {
501 floor_setup->data.t1.class_dimensions[j] = get_bits(gb, 3) + 1;
502 floor_setup->data.t1.class_subclasses[j] = get_bits(gb, 2);
503
504 AV_DEBUG(" %d floor %d class dim: %d subclasses %d \n", i, j, floor_setup->data.t1.class_dimensions[j], floor_setup->data.t1.class_subclasses[j]);
505
506 if (floor_setup->data.t1.class_subclasses[j]) {
507 GET_VALIDATED_INDEX(floor_setup->data.t1.class_masterbook[j], 8, vc->codebook_count)
508
509 AV_DEBUG(" masterbook: %d \n", floor_setup->data.t1.class_masterbook[j]);
510 }
511
512 for (k = 0; k < (1 << floor_setup->data.t1.class_subclasses[j]); ++k) {
513 int16_t bits = get_bits(gb, 8) - 1;
514 if (bits != -1)
515 VALIDATE_INDEX(bits, vc->codebook_count)
516 floor_setup->data.t1.subclass_books[j][k] = bits;
517
518 AV_DEBUG(" book %d. : %d \n", k, floor_setup->data.t1.subclass_books[j][k]);
519 }
520 }
521
522 floor_setup->data.t1.multiplier = get_bits(gb, 2) + 1;
523 floor_setup->data.t1.x_list_dim = 2;
524
525 for (j = 0; j < floor_setup->data.t1.partitions; ++j)
526 floor_setup->data.t1.x_list_dim+=floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];
527
528 floor_setup->data.t1.list = av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(vorbis_floor1_entry));
529
530
531 rangebits = get_bits(gb, 4);
532 floor_setup->data.t1.list[0].x = 0;
533 floor_setup->data.t1.list[1].x = (1 << rangebits);
534
535 for (j = 0; j < floor_setup->data.t1.partitions; ++j) {
536 for (k = 0; k < floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]]; ++k, ++floor1_values) {
537 floor_setup->data.t1.list[floor1_values].x = get_bits(gb, rangebits);
538
539 AV_DEBUG(" %d. floor1 Y coord. %d \n", floor1_values, floor_setup->data.t1.list[floor1_values].x);
540 }
541 }
542
543 // Precalculate order of x coordinates - needed for decode
544 ff_vorbis_ready_floor1_list(floor_setup->data.t1.list, floor_setup->data.t1.x_list_dim);
545 } else if (floor_setup->floor_type == 0) {
546 uint_fast8_t max_codebook_dim = 0;
547
548 floor_setup->decode = vorbis_floor0_decode;
549
550 floor_setup->data.t0.order = get_bits(gb, 8);
551 floor_setup->data.t0.rate = get_bits(gb, 16);
552 floor_setup->data.t0.bark_map_size = get_bits(gb, 16);
553 floor_setup->data.t0.amplitude_bits = get_bits(gb, 6);
554 /* zero would result in a div by zero later *
555 * 2^0 - 1 == 0 */
556 if (floor_setup->data.t0.amplitude_bits == 0) {
557 av_log(vc->avccontext, AV_LOG_ERROR,
558 "Floor 0 amplitude bits is 0.\n");
559 return -1;
560 }
561 floor_setup->data.t0.amplitude_offset = get_bits(gb, 8);
562 floor_setup->data.t0.num_books = get_bits(gb, 4) + 1;
563
564 /* allocate mem for booklist */
565 floor_setup->data.t0.book_list =
566 av_malloc(floor_setup->data.t0.num_books);
567 if (!floor_setup->data.t0.book_list)
568 return -1;
569 /* read book indexes */
570 {
571 int idx;
572 uint_fast8_t book_idx;
573 for (idx = 0; idx < floor_setup->data.t0.num_books; ++idx) {
574 GET_VALIDATED_INDEX(floor_setup->data.t0.book_list[idx], 8, vc->codebook_count)
575 if (vc->codebooks[book_idx].dimensions > max_codebook_dim)
576 max_codebook_dim = vc->codebooks[book_idx].dimensions;
577 }
578 }
579
580 create_map(vc, i);
581
582 /* allocate mem for lsp coefficients */
583 {
584 /* codebook dim is for padding if codebook dim doesn't *
585 * divide order+1 then we need to read more data */
586 floor_setup->data.t0.lsp =
587 av_malloc((floor_setup->data.t0.order+1 + max_codebook_dim)
588 * sizeof(float));
589 if (!floor_setup->data.t0.lsp)
590 return -1;
591 }
592
593 #ifdef V_DEBUG /* debug output parsed headers */
594 AV_DEBUG("floor0 order: %u\n", floor_setup->data.t0.order);
595 AV_DEBUG("floor0 rate: %u\n", floor_setup->data.t0.rate);
596 AV_DEBUG("floor0 bark map size: %u\n",
597 floor_setup->data.t0.bark_map_size);
598 AV_DEBUG("floor0 amplitude bits: %u\n",
599 floor_setup->data.t0.amplitude_bits);
600 AV_DEBUG("floor0 amplitude offset: %u\n",
601 floor_setup->data.t0.amplitude_offset);
602 AV_DEBUG("floor0 number of books: %u\n",
603 floor_setup->data.t0.num_books);
604 AV_DEBUG("floor0 book list pointer: %p\n",
605 floor_setup->data.t0.book_list);
606 {
607 int idx;
608 for (idx = 0; idx < floor_setup->data.t0.num_books; ++idx) {
609 AV_DEBUG(" Book %d: %u\n",
610 idx+1,
611 floor_setup->data.t0.book_list[idx]);
612 }
613 }
614 #endif
615 } else {
616 av_log(vc->avccontext, AV_LOG_ERROR, "Invalid floor type!\n");
617 return -1;
618 }
619 }
620 return 0;
621 }
622
623 // Process residues part
624
625 static int vorbis_parse_setup_hdr_residues(vorbis_context *vc)
626 {
627 GetBitContext *gb = &vc->gb;
628 uint_fast8_t i, j, k;
629
630 vc->residue_count = get_bits(gb, 6)+1;
631 vc->residues = av_mallocz(vc->residue_count * sizeof(vorbis_residue));
632
633 AV_DEBUG(" There are %d residues. \n", vc->residue_count);
634
635 for (i = 0; i < vc->residue_count; ++i) {
636 vorbis_residue *res_setup = &vc->residues[i];
637 uint_fast8_t cascade[64];
638 uint_fast8_t high_bits;
639 uint_fast8_t low_bits;
640
641 res_setup->type = get_bits(gb, 16);
642
643 AV_DEBUG(" %d. residue type %d \n", i, res_setup->type);
644
645 res_setup->begin = get_bits(gb, 24);
646 res_setup->end = get_bits(gb, 24);
647 res_setup->partition_size = get_bits(gb, 24) + 1;
648 /* Validations to prevent a buffer overflow later. */
649 if (res_setup->begin>res_setup->end ||
650 res_setup->end>vc->blocksize[1] / (res_setup->type == 2 ? 1 : 2) ||
651 (res_setup->end-res_setup->begin) / res_setup->partition_size > V_MAX_PARTITIONS) {
652 av_log(vc->avccontext, AV_LOG_ERROR, "partition out of bounds: type, begin, end, size, blocksize: %"PRIdFAST16", %"PRIdFAST32", %"PRIdFAST32", %"PRIdFAST32", %"PRIdFAST32"\n", res_setup->type, res_setup->begin, res_setup->end, res_setup->partition_size, vc->blocksize[1] / 2);
653 return -1;
654 }
655
656 res_setup->classifications = get_bits(gb, 6) + 1;
657 GET_VALIDATED_INDEX(res_setup->classbook, 8, vc->codebook_count)
658
659 AV_DEBUG(" begin %d end %d part.size %d classif.s %d classbook %d \n", res_setup->begin, res_setup->end, res_setup->partition_size,
660 res_setup->classifications, res_setup->classbook);
661
662 for (j = 0; j < res_setup->classifications; ++j) {
663 high_bits = 0;
664 low_bits = get_bits(gb, 3);
665 if (get_bits1(gb))
666 high_bits = get_bits(gb, 5);
667 cascade[j] = (high_bits << 3) + low_bits;
668
669 AV_DEBUG(" %d class casscade depth: %d \n", j, ilog(cascade[j]));
670 }
671
672 res_setup->maxpass = 0;
673 for (j = 0; j < res_setup->classifications; ++j) {
674 for (k = 0; k < 8; ++k) {
675 if (cascade[j]&(1 << k)) {
676 GET_VALIDATED_INDEX(res_setup->books[j][k], 8, vc->codebook_count)
677
678 AV_DEBUG(" %d class casscade depth %d book: %d \n", j, k, res_setup->books[j][k]);
679
680 if (k>res_setup->maxpass)
681 res_setup->maxpass = k;
682 } else {
683 res_setup->books[j][k] = -1;
684 }
685 }
686 }
687 }
688 return 0;
689 }
690
691 // Process mappings part
692
693 static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc)
694 {
695 GetBitContext *gb = &vc->gb;
696 uint_fast8_t i, j;
697
698 vc->mapping_count = get_bits(gb, 6)+1;
699 vc->mappings = av_mallocz(vc->mapping_count * sizeof(vorbis_mapping));
700
701 AV_DEBUG(" There are %d mappings. \n", vc->mapping_count);
702
703 for (i = 0; i < vc->mapping_count; ++i) {
704 vorbis_mapping *mapping_setup = &vc->mappings[i];
705
706 if (get_bits(gb, 16)) {
707 av_log(vc->avccontext, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n");
708 return -1;
709 }
710 if (get_bits1(gb)) {
711 mapping_setup->submaps = get_bits(gb, 4) + 1;
712 } else {
713 mapping_setup->submaps = 1;
714 }
715
716 if (get_bits1(gb)) {
717 mapping_setup->coupling_steps = get_bits(gb, 8) + 1;
718 mapping_setup->magnitude = av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
719 mapping_setup->angle = av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
720 for (j = 0; j < mapping_setup->coupling_steps; ++j) {
721 GET_VALIDATED_INDEX(mapping_setup->magnitude[j], ilog(vc->audio_channels - 1), vc->audio_channels)
722 GET_VALIDATED_INDEX(mapping_setup->angle[j], ilog(vc->audio_channels - 1), vc->audio_channels)
723 }
724 } else {
725 mapping_setup->coupling_steps = 0;
726 }
727
728 AV_DEBUG(" %d mapping coupling steps: %d \n", i, mapping_setup->coupling_steps);
729
730 if (get_bits(gb, 2)) {
731 av_log(vc->avccontext, AV_LOG_ERROR, "%d. mapping setup data invalid. \n", i);
732 return -1; // following spec.
733 }
734
735 if (mapping_setup->submaps>1) {
736 mapping_setup->mux = av_mallocz(vc->audio_channels * sizeof(uint_fast8_t));
737 for (j = 0; j < vc->audio_channels; ++j)
738 mapping_setup->mux[j] = get_bits(gb, 4);
739 }
740
741 for (j = 0; j < mapping_setup->submaps; ++j) {
742 skip_bits(gb, 8); // FIXME check?
743 GET_VALIDATED_INDEX(mapping_setup->submap_floor[j], 8, vc->floor_count)
744 GET_VALIDATED_INDEX(mapping_setup->submap_residue[j], 8, vc->residue_count)
745
746 AV_DEBUG(" %d mapping %d submap : floor %d, residue %d \n", i, j, mapping_setup->submap_floor[j], mapping_setup->submap_residue[j]);
747 }
748 }
749 return 0;
750 }
751
752 // Process modes part
753
754 static void create_map(vorbis_context *vc, uint_fast8_t floor_number)
755 {
756 vorbis_floor *floors = vc->floors;
757 vorbis_floor0 *vf;
758 int idx;
759 int_fast8_t blockflag;
760 int_fast32_t *map;
761 int_fast32_t n; //TODO: could theoretically be smaller?
762
763 for (blockflag = 0; blockflag < 2; ++blockflag) {
764 n = vc->blocksize[blockflag] / 2;
765 floors[floor_number].data.t0.map[blockflag] =
766 av_malloc((n+1) * sizeof(int_fast32_t)); // n + sentinel
767
768 map = floors[floor_number].data.t0.map[blockflag];
769 vf = &floors[floor_number].data.t0;
770
771 for (idx = 0; idx < n; ++idx) {
772 map[idx] = floor(BARK((vf->rate * idx) / (2.0f * n)) *
773 ((vf->bark_map_size) /
774 BARK(vf->rate / 2.0f)));
775 if (vf->bark_map_size-1 < map[idx])
776 map[idx] = vf->bark_map_size - 1;
777 }
778 map[n] = -1;
779 vf->map_size[blockflag] = n;
780 }
781
782 # ifdef V_DEBUG
783 for (idx = 0; idx <= n; ++idx) {
784 AV_DEBUG("floor0 map: map at pos %d is %d\n",
785 idx, map[idx]);
786 }
787 # endif
788 }
789
790 static int vorbis_parse_setup_hdr_modes(vorbis_context *vc)
791 {
792 GetBitContext *gb = &vc->gb;
793 uint_fast8_t i;
794
795 vc->mode_count = get_bits(gb, 6) + 1;
796 vc->modes = av_mallocz(vc->mode_count * sizeof(vorbis_mode));
797
798 AV_DEBUG(" There are %d modes.\n", vc->mode_count);
799
800 for (i = 0; i < vc->mode_count; ++i) {
801 vorbis_mode *mode_setup = &vc->modes[i];
802
803 mode_setup->blockflag = get_bits1(gb);
804 mode_setup->windowtype = get_bits(gb, 16); //FIXME check
805 mode_setup->transformtype = get_bits(gb, 16); //FIXME check
806 GET_VALIDATED_INDEX(mode_setup->mapping, 8, vc->mapping_count);
807
808 AV_DEBUG(" %d mode: blockflag %d, windowtype %d, transformtype %d, mapping %d \n", i, mode_setup->blockflag, mode_setup->windowtype, mode_setup->transformtype, mode_setup->mapping);
809 }
810 return 0;
811 }
812
813 // Process the whole setup header using the functions above
814
815 static int vorbis_parse_setup_hdr(vorbis_context *vc)
816 {
817 GetBitContext *gb = &vc->gb;
818
819 if ((get_bits(gb, 8) != 'v') || (get_bits(gb, 8) != 'o') ||
820 (get_bits(gb, 8) != 'r') || (get_bits(gb, 8) != 'b') ||
821 (get_bits(gb, 8) != 'i') || (get_bits(gb, 8) != 's')) {
822 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n");
823 return -1;
824 }
825
826 if (vorbis_parse_setup_hdr_codebooks(vc)) {
827 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n");
828 return -2;
829 }
830 if (vorbis_parse_setup_hdr_tdtransforms(vc)) {
831 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n");
832 return -3;
833 }
834 if (vorbis_parse_setup_hdr_floors(vc)) {
835 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n");
836 return -4;
837 }
838 if (vorbis_parse_setup_hdr_residues(vc)) {
839 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n");
840 return -5;
841 }
842 if (vorbis_parse_setup_hdr_mappings(vc)) {
843 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n");
844 return -6;
845 }
846 if (vorbis_parse_setup_hdr_modes(vc)) {
847 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n");
848 return -7;
849 }
850 if (!get_bits1(gb)) {
851 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n");
852 return -8; // framing flag bit unset error
853 }
854
855 return 0;
856 }
857
858 // Process the identification header
859
860 static int vorbis_parse_id_hdr(vorbis_context *vc)
861 {
862 GetBitContext *gb = &vc->gb;
863 uint_fast8_t bl0, bl1;
864
865 if ((get_bits(gb, 8) != 'v') || (get_bits(gb, 8) != 'o') ||
866 (get_bits(gb, 8) != 'r') || (get_bits(gb, 8) != 'b') ||
867 (get_bits(gb, 8) != 'i') || (get_bits(gb, 8) != 's')) {
868 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n");
869 return -1;
870 }
871
872 vc->version = get_bits_long(gb, 32); //FIXME check 0
873 vc->audio_channels = get_bits(gb, 8);
874 if (vc->audio_channels <= 0) {
875 av_log(vc->avccontext, AV_LOG_ERROR, "Invalid number of channels\n");
876 return -1;
877 }
878 vc->audio_samplerate = get_bits_long(gb, 32);
879 if (vc->audio_samplerate <= 0) {
880 av_log(vc->avccontext, AV_LOG_ERROR, "Invalid samplerate\n");
881 return -1;
882 }
883 vc->bitrate_maximum = get_bits_long(gb, 32);
884 vc->bitrate_nominal = get_bits_long(gb, 32);
885 vc->bitrate_minimum = get_bits_long(gb, 32);
886 bl0 = get_bits(gb, 4);
887 bl1 = get_bits(gb, 4);
888 vc->blocksize[0] = (1 << bl0);
889 vc->blocksize[1] = (1 << bl1);
890 if (bl0 > 13 || bl0 < 6 || bl1 > 13 || bl1 < 6 || bl1 < bl0) {
891 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n");
892 return -3;
893 }
894 // output format int16
895 if (vc->blocksize[1] / 2 * vc->audio_channels * 2 > AVCODEC_MAX_AUDIO_FRAME_SIZE) {
896 av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis channel count makes "
897 "output packets too large.\n");
898 return -4;
899 }
900 vc->win[0] = ff_vorbis_vwin[bl0 - 6];
901 vc->win[1] = ff_vorbis_vwin[bl1 - 6];
902
903 if ((get_bits1(gb)) == 0) {
904 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n");
905 return -2;
906 }
907
908 vc->channel_residues = av_malloc((vc->blocksize[1] / 2) * vc->audio_channels * sizeof(float));
909 vc->channel_floors = av_malloc((vc->blocksize[1] / 2) * vc->audio_channels * sizeof(float));
910 vc->saved = av_mallocz((vc->blocksize[1] / 4) * vc->audio_channels * sizeof(float));
911 vc->previous_window = 0;
912
913 ff_mdct_init(&vc->mdct[0], bl0, 1, vc->exp_bias ? -(1 << 15) : -1.0);
914 ff_mdct_init(&vc->mdct[1], bl1, 1, vc->exp_bias ? -(1 << 15) : -1.0);
915
916 AV_DEBUG(" 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 ",
917 vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize[0], vc->blocksize[1]);
918
919 /*
920 BLK = vc->blocksize[0];
921 for (i = 0; i < BLK / 2; ++i) {
922 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)));
923 }
924 */
925
926 return 0;
927 }
928
929 // Process the extradata using the functions above (identification header, setup header)
930
931 static av_cold int vorbis_decode_init(AVCodecContext *avccontext)
932 {
933 vorbis_context *vc = avccontext->priv_data ;
934 uint8_t *headers = avccontext->extradata;
935 int headers_len = avccontext->extradata_size;
936 uint8_t *header_start[3];
937 int header_len[3];
938 GetBitContext *gb = &(vc->gb);
939 int hdr_type;
940
941 vc->avccontext = avccontext;
942 dsputil_init(&vc->dsp, avccontext);
943
944 if (vc->dsp.float_to_int16_interleave == ff_float_to_int16_interleave_c) {
945 vc->add_bias = 385;
946 vc->exp_bias = 0;
947 } else {
948 vc->add_bias = 0;
949 vc->exp_bias = 15 << 23;
950 }
951
952 if (!headers_len) {
953 av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
954 return -1;
955 }
956
957 if (ff_split_xiph_headers(headers, headers_len, 30, header_start, header_len) < 0) {
958 av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
959 return -1;
960 }
961
962 init_get_bits(gb, header_start[0], header_len[0]*8);
963 hdr_type = get_bits(gb, 8);
964 if (hdr_type != 1) {
965 av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n");
966 return -1;
967 }
968 if (vorbis_parse_id_hdr(vc)) {
969 av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n");
970 vorbis_free(vc);
971 return -1;
972 }
973
974 init_get_bits(gb, header_start[2], header_len[2]*8);
975 hdr_type = get_bits(gb, 8);
976 if (hdr_type != 5) {
977 av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");
978 vorbis_free(vc);
979 return -1;
980 }
981 if (vorbis_parse_setup_hdr(vc)) {
982 av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");
983 vorbis_free(vc);
984 return -1;
985 }
986
987 if (vc->audio_channels > 6)
988 avccontext->channel_layout = 0;
989 else
990 avccontext->channel_layout = ff_vorbis_channel_layouts[vc->audio_channels - 1];
991
992 avccontext->channels = vc->audio_channels;
993 avccontext->sample_rate = vc->audio_samplerate;
994 avccontext->frame_size = FFMIN(vc->blocksize[0], vc->blocksize[1]) >> 2;
995 avccontext->sample_fmt = SAMPLE_FMT_S16;
996
997 return 0 ;
998 }
999
1000 // Decode audiopackets -------------------------------------------------
1001
1002 // Read and decode floor
1003
1004 static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,
1005 vorbis_floor_data *vfu, float *vec)
1006 {
1007 vorbis_floor0 *vf = &vfu->t0;
1008 float *lsp = vf->lsp;
1009 uint_fast32_t amplitude;
1010 uint_fast32_t book_idx;
1011 uint_fast8_t blockflag = vc->modes[vc->mode_number].blockflag;
1012
1013 amplitude = get_bits(&vc->gb, vf->amplitude_bits);
1014 if (amplitude > 0) {
1015 float last = 0;
1016 uint_fast16_t lsp_len = 0;
1017 uint_fast16_t idx;
1018 vorbis_codebook codebook;
1019
1020 book_idx = get_bits(&vc->gb, ilog(vf->num_books));
1021 if (book_idx >= vf->num_books) {
1022 av_log(vc->avccontext, AV_LOG_ERROR,
1023 "floor0 dec: booknumber too high!\n");
1024 book_idx = 0;
1025 //FIXME: look above
1026 }
1027 AV_DEBUG("floor0 dec: booknumber: %u\n", book_idx);
1028 codebook = vc->codebooks[vf->book_list[book_idx]];
1029
1030 while (lsp_len<vf->order) {
1031 int vec_off;
1032
1033 AV_DEBUG("floor0 dec: book dimension: %d\n", codebook.dimensions);
1034 AV_DEBUG("floor0 dec: maximum depth: %d\n", codebook.maxdepth);
1035 /* read temp vector */
1036 vec_off = get_vlc2(&vc->gb, codebook.vlc.table,
1037 codebook.nb_bits, codebook.maxdepth)
1038 * codebook.dimensions;
1039 AV_DEBUG("floor0 dec: vector offset: %d\n", vec_off);
1040 /* copy each vector component and add last to it */
1041 for (idx = 0; idx < codebook.dimensions; ++idx)
1042 lsp[lsp_len+idx] = codebook.codevectors[vec_off+idx] + last;
1043 last = lsp[lsp_len+idx-1]; /* set last to last vector component */
1044
1045 lsp_len += codebook.dimensions;
1046 }
1047 #ifdef V_DEBUG
1048 /* DEBUG: output lsp coeffs */
1049 {
1050 int idx;
1051 for (idx = 0; idx < lsp_len; ++idx)
1052 AV_DEBUG("floor0 dec: coeff at %d is %f\n", idx, lsp[idx]);
1053 }
1054 #endif
1055
1056 /* synthesize floor output vector */
1057 {
1058 int i;
1059 int order = vf->order;
1060 float wstep = M_PI / vf->bark_map_size;
1061
1062 for (i = 0; i < order; i++)
1063 lsp[i] = 2.0f * cos(lsp[i]);
1064
1065 AV_DEBUG("floor0 synth: map_size = %d; m = %d; wstep = %f\n",
1066 vf->map_size, order, wstep);
1067
1068 i = 0;
1069 while (i < vf->map_size[blockflag]) {
1070 int j, iter_cond = vf->map[blockflag][i];
1071 float p = 0.5f;
1072 float q = 0.5f;
1073 float two_cos_w = 2.0f * cos(wstep * iter_cond); // needed all times
1074
1075 /* similar part for the q and p products */
1076 for (j = 0; j + 1 < order; j += 2) {
1077 q *= lsp[j] - two_cos_w;
1078 p *= lsp[j + 1] - two_cos_w;
1079 }
1080 if (j == order) { // even order
1081 p *= p * (2.0f - two_cos_w);
1082 q *= q * (2.0f + two_cos_w);
1083 } else { // odd order
1084 q *= two_cos_w-lsp[j]; // one more time for q
1085
1086 /* final step and square */
1087 p *= p * (4.f - two_cos_w * two_cos_w);
1088 q *= q;
1089 }
1090
1091 /* calculate linear floor value */
1092 {
1093 q = exp((((amplitude*vf->amplitude_offset) /
1094 (((1 << vf->amplitude_bits) - 1) * sqrt(p + q)))
1095 - vf->amplitude_offset) * .11512925f);
1096 }
1097
1098 /* fill vector */
1099 do {
1100 vec[i] = q; ++i;
1101 } while (vf->map[blockflag][i] == iter_cond);
1102 }
1103 }
1104 } else {
1105 /* this channel is unused */
1106 return 1;
1107 }
1108
1109 AV_DEBUG(" Floor0 decoded\n");
1110
1111 return 0;
1112 }
1113
1114 static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc,
1115 vorbis_floor_data *vfu, float *vec)
1116 {
1117 vorbis_floor1 *vf = &vfu->t1;
1118 GetBitContext *gb = &vc->gb;
1119 uint_fast16_t range_v[4] = { 256, 128, 86, 64 };
1120 uint_fast16_t range = range_v[vf->multiplier-1];
1121 uint_fast16_t floor1_Y[vf->x_list_dim];
1122 uint_fast16_t floor1_Y_final[vf->x_list_dim];
1123 int floor1_flag[vf->x_list_dim];
1124 uint_fast8_t class_;
1125 uint_fast8_t cdim;
1126 uint_fast8_t cbits;
1127 uint_fast8_t csub;
1128 uint_fast8_t cval;
1129 int_fast16_t book;
1130 uint_fast16_t offset;
1131 uint_fast16_t i,j;
1132 /*u*/int_fast16_t adx, ady, off, predicted; // WTF ? dy/adx = (unsigned)dy/adx ?
1133 int_fast16_t dy, err;
1134
1135
1136 if (!get_bits1(gb)) // silence
1137 return 1;
1138
1139 // Read values (or differences) for the floor's points
1140
1141 floor1_Y[0] = get_bits(gb, ilog(range - 1));
1142 floor1_Y[1] = get_bits(gb, ilog(range - 1));
1143
1144 AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);
1145
1146 offset = 2;
1147 for (i = 0; i < vf->partitions; ++i) {
1148 class_ = vf->partition_class[i];
1149 cdim = vf->class_dimensions[class_];
1150 cbits = vf->class_subclasses[class_];
1151 csub = (1 << cbits) - 1;
1152 cval = 0;
1153
1154 AV_DEBUG("Cbits %d \n", cbits);
1155
1156 if (cbits) // this reads all subclasses for this partition's class
1157 cval = get_vlc2(gb, vc->codebooks[vf->class_masterbook[class_]].vlc.table,
1158 vc->codebooks[vf->class_masterbook[class_]].nb_bits, 3);
1159
1160 for (j = 0; j < cdim; ++j) {
1161 book = vf->subclass_books[class_][cval & csub];
1162
1163 AV_DEBUG("book %d Cbits %d cval %d bits:%d \n", book, cbits, cval, get_bits_count(gb));
1164
1165 cval = cval >> cbits;
1166 if (book > -1) {
1167 floor1_Y[offset+j] = get_vlc2(gb, vc->codebooks[book].vlc.table,
1168 vc->codebooks[book].nb_bits, 3);
1169 } else {
1170 floor1_Y[offset+j] = 0;
1171 }
1172
1173 AV_DEBUG(" floor(%d) = %d \n", vf->list[offset+j].x, floor1_Y[offset+j]);
1174 }
1175 offset+=cdim;
1176 }
1177
1178 // Amplitude calculation from the differences
1179
1180 floor1_flag[0] = 1;
1181 floor1_flag[1] = 1;
1182 floor1_Y_final[0] = floor1_Y[0];
1183 floor1_Y_final[1] = floor1_Y[1];
1184
1185 for (i = 2; i < vf->x_list_dim; ++i) {
1186 uint_fast16_t val, highroom, lowroom, room;
1187 uint_fast16_t high_neigh_offs;
1188 uint_fast16_t low_neigh_offs;
1189
1190 low_neigh_offs = vf->list[i].low;
1191 high_neigh_offs = vf->list[i].high;
1192 dy = floor1_Y_final[high_neigh_offs] - floor1_Y_final[low_neigh_offs]; // render_point begin
1193 adx = vf->list[high_neigh_offs].x - vf->list[low_neigh_offs].x;
1194 ady = FFABS(dy);
1195 err = ady * (vf->list[i].x - vf->list[low_neigh_offs].x);
1196 off = (int16_t)err / (int16_t)adx;
1197 if (dy < 0) {
1198 predicted = floor1_Y_final[low_neigh_offs] - off;
1199 } else {
1200 predicted = floor1_Y_final[low_neigh_offs] + off;
1201 } // render_point end
1202
1203 val = floor1_Y[i];
1204 highroom = range-predicted;
1205 lowroom = predicted;
1206 if (highroom < lowroom) {
1207 room = highroom * 2;
1208 } else {
1209 room = lowroom * 2; // SPEC mispelling
1210 }
1211 if (val) {
1212 floor1_flag[low_neigh_offs] = 1;
1213 floor1_flag[high_neigh_offs] = 1;
1214 floor1_flag[i] = 1;
1215 if (val >= room) {
1216 if (highroom > lowroom) {
1217 floor1_Y_final[i] = val - lowroom + predicted;
1218 } else {
1219 floor1_Y_final[i] = predicted - val + highroom - 1;
1220 }
1221 } else {
1222 if (val & 1) {
1223 floor1_Y_final[i] = predicted - (val + 1) / 2;
1224 } else {
1225 floor1_Y_final[i] = predicted + val / 2;
1226 }
1227 }
1228 } else {
1229 floor1_flag[i] = 0;
1230 floor1_Y_final[i] = predicted;
1231 }
1232
1233 AV_DEBUG(" Decoded floor(%d) = %d / val %d \n", vf->list[i].x, floor1_Y_final[i], val);
1234 }
1235
1236 // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?
1237
1238 ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);
1239
1240 AV_DEBUG(" Floor decoded\n");
1241
1242 return 0;
1243 }
1244
1245 // Read and decode residue
1246
1247 static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc,
1248 vorbis_residue *vr,
1249 uint_fast8_t ch,
1250 uint_fast8_t *do_not_decode,
1251 float *vec,
1252 uint_fast16_t vlen,
1253 int vr_type)
1254 {
1255 GetBitContext *gb = &vc->gb;
1256 uint_fast8_t c_p_c = vc->codebooks[vr->classbook].dimensions;
1257 uint_fast16_t n_to_read = vr->end-vr->begin;
1258 uint_fast16_t ptns_to_read = n_to_read/vr->partition_size;
1259 uint_fast8_t classifs[ptns_to_read*vc->audio_channels];
1260 uint_fast8_t pass;
1261 uint_fast8_t ch_used;
1262 uint_fast8_t i,j,l;
1263 uint_fast16_t k;
1264
1265 if (vr_type == 2) {
1266 for (j = 1; j < ch; ++j)
1267 do_not_decode[0] &= do_not_decode[j]; // FIXME - clobbering input
1268 if (do_not_decode[0])
1269 return 0;
1270 ch_used = 1;
1271 } else {
1272 ch_used = ch;
1273 }
1274
1275 AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d cpc %d \n", ch, c_p_c);
1276
1277 for (pass = 0; pass <= vr->maxpass; ++pass) { // FIXME OPTIMIZE?
1278 uint_fast16_t voffset;
1279 uint_fast16_t partition_count;
1280 uint_fast16_t j_times_ptns_to_read;
1281
1282 voffset = vr->begin;
1283 for (partition_count = 0; partition_count < ptns_to_read;) { // SPEC error
1284 if (!pass) {
1285 uint_fast32_t inverse_class = ff_inverse[vr->classifications];
1286 for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {
1287 if (!do_not_decode[j]) {
1288 uint_fast32_t temp = get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,
1289 vc->codebooks[vr->classbook].nb_bits, 3);
1290
1291 AV_DEBUG("Classword: %d \n", temp);
1292
1293 assert(vr->classifications > 1 && temp <= 65536); //needed for inverse[]
1294 for (i = 0; i < c_p_c; ++i) {
1295 uint_fast32_t temp2;
1296
1297 temp2 = (((uint_fast64_t)temp) * inverse_class) >> 32;
1298 if (partition_count + c_p_c - 1 - i < ptns_to_read)
1299 classifs[j_times_ptns_to_read + partition_count + c_p_c - 1 - i] = temp - temp2 * vr->classifications;
1300 temp = temp2;
1301 }
1302 }
1303 j_times_ptns_to_read += ptns_to_read;
1304 }
1305 }
1306 for (i = 0; (i < c_p_c) && (partition_count < ptns_to_read); ++i) {
1307 for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {
1308 uint_fast16_t voffs;
1309
1310 if (!do_not_decode[j]) {
1311 uint_fast8_t vqclass = classifs[j_times_ptns_to_read+partition_count];
1312 int_fast16_t vqbook = vr->books[vqclass][pass];
1313
1314 if (vqbook >= 0 && vc->codebooks[vqbook].codevectors) {
1315 uint_fast16_t coffs;
1316 unsigned dim = vc->codebooks[vqbook].dimensions; // not uint_fast8_t: 64bit is slower here on amd64
1317 uint_fast16_t step = dim == 1 ? vr->partition_size
1318 : FASTDIV(vr->partition_size, dim);
1319 vorbis_codebook codebook = vc->codebooks[vqbook];
1320
1321 if (vr_type == 0) {
1322
1323 voffs = voffset+j*vlen;
1324 for (k = 0; k < step; ++k) {
1325 coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1326 for (l = 0; l < dim; ++l)
1327 vec[voffs + k + l * step] += codebook.codevectors[coffs + l]; // FPMATH
1328 }
1329 } else if (vr_type == 1) {
1330 voffs = voffset + j * vlen;
1331 for (k = 0; k < step; ++k) {
1332 coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1333 for (l = 0; l < dim; ++l, ++voffs) {
1334 vec[voffs]+=codebook.codevectors[coffs+l]; // FPMATH
1335
1336 AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d \n", pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);
1337 }
1338 }
1339 } else if (vr_type == 2 && ch == 2 && (voffset & 1) == 0 && (dim & 1) == 0) { // most frequent case optimized
1340 voffs = voffset >> 1;
1341
1342 if (dim == 2) {
1343 for (k = 0; k < step; ++k) {
1344 coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;
1345 vec[voffs + k ] += codebook.codevectors[coffs ]; // FPMATH
1346 vec[voffs + k + vlen] += codebook.codevectors[coffs + 1]; // FPMATH
1347 }
1348 } else if (dim == 4) {
1349 for (k = 0; k < step; ++k, voffs += 2) {
1350 coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4;
1351 vec[voffs ] += codebook.codevectors[coffs ]; // FPMATH
1352 vec[voffs + 1 ] += codebook.codevectors[coffs + 2]; // FPMATH
1353 vec[voffs + vlen ] += codebook.codevectors[coffs + 1]; // FPMATH
1354 vec[voffs + vlen + 1] += codebook.codevectors[coffs + 3]; // FPMATH
1355 }
1356 } else
1357 for (k = 0; k < step; ++k) {
1358 coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1359 for (l = 0; l < dim; l += 2, voffs++) {
1360 vec[voffs ] += codebook.codevectors[coffs + l ]; // FPMATH
1361 vec[voffs + vlen] += codebook.codevectors[coffs + l + 1]; // FPMATH
1362
1363 AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d+%d \n", pass, voffset / ch + (voffs % ch) * vlen, vec[voffset / ch + (voffs % ch) * vlen], codebook.codevectors[coffs + l], coffs, l);
1364 }
1365 }
1366
1367 } else if (vr_type == 2) {
1368 voffs = voffset;
1369
1370 for (k = 0; k < step; ++k) {
1371 coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1372 for (l = 0; l < dim; ++l, ++voffs) {
1373 vec[voffs / ch + (voffs % ch) * vlen] += codebook.codevectors[coffs + l]; // FPMATH FIXME use if and counter instead of / and %
1374
1375 AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d+%d \n", pass, voffset / ch + (voffs % ch) * vlen, vec[voffset / ch + (voffs % ch) * vlen], codebook.codevectors[coffs + l], coffs, l);
1376 }
1377 }
1378 }
1379 }
1380 }
1381 j_times_ptns_to_read += ptns_to_read;
1382 }
1383 ++partition_count;
1384 voffset += vr->partition_size;
1385 }
1386 }
1387 }
1388 return 0;
1389 }
1390
1391 static inline int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr,
1392 uint_fast8_t ch,
1393 uint_fast8_t *do_not_decode,
1394 float *vec, uint_fast16_t vlen)
1395 {
1396 if (vr->type == 2)
1397 return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 2);
1398 else if (vr->type == 1)
1399 return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 1);
1400 else if (vr->type == 0)
1401 return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 0);
1402 else {
1403 av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");
1404 return -1;
1405 }
1406 }
1407
1408 void vorbis_inverse_coupling(float *mag, float *ang, int blocksize)
1409 {
1410 int i;
1411 for (i = 0; i < blocksize; i++) {
1412 if (mag[i] > 0.0) {
1413 if (ang[i] > 0.0) {
1414 ang[i] = mag[i] - ang[i];
1415 } else {
1416 float temp = ang[i];
1417 ang[i] = mag[i];
1418 mag[i] += temp;
1419 }
1420 } else {
1421 if (ang[i] > 0.0) {
1422 ang[i] += mag[i];
1423 } else {
1424 float temp = ang[i];
1425 ang[i] = mag[i];
1426 mag[i] -= temp;
1427 }
1428 }
1429 }
1430 }
1431
1432 static void copy_normalize(float *dst, float *src, int len, int exp_bias,
1433 float add_bias)
1434 {
1435 int i;
1436 if (exp_bias) {
1437 memcpy(dst, src, len * sizeof(float));
1438 } else {
1439 for (i = 0; i < len; i++)
1440 dst[i] = src[i] + add_bias;
1441 }
1442 }
1443
1444 // Decode the audio packet using the functions above
1445
1446 static int vorbis_parse_audio_packet(vorbis_context *vc)
1447 {
1448 GetBitContext *gb = &vc->gb;
1449
1450 uint_fast8_t previous_window = vc->previous_window;
1451 uint_fast8_t mode_number;
1452 uint_fast8_t blockflag;
1453 uint_fast16_t blocksize;
1454 int_fast32_t i,j;
1455 uint_fast8_t no_residue[vc->audio_channels];
1456 uint_fast8_t do_not_decode[vc->audio_channels];
1457 vorbis_mapping *mapping;
1458 float *ch_res_ptr = vc->channel_residues;
1459 float *ch_floor_ptr = vc->channel_floors;
1460 uint_fast8_t res_chan[vc->audio_channels];
1461 uint_fast8_t res_num = 0;
1462 int_fast16_t retlen = 0;
1463 float fadd_bias = vc->add_bias;
1464
1465 if (get_bits1(gb)) {
1466 av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");
1467 return -1; // packet type not audio
1468 }
1469
1470 if (vc->mode_count == 1) {
1471 mode_number = 0;
1472 } else {
1473 GET_VALIDATED_INDEX(mode_number, ilog(vc->mode_count-1), vc->mode_count)
1474 }
1475 vc->mode_number = mode_number;
1476 mapping = &vc->mappings[vc->modes[mode_number].mapping];
1477
1478 AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);
1479
1480 blockflag = vc->modes[mode_number].blockflag;
1481 blocksize = vc->blocksize[blockflag];
1482 if (blockflag)
1483 skip_bits(gb, 2); // previous_window, next_window
1484
1485 memset(ch_res_ptr, 0, sizeof(float) * vc->audio_channels * blocksize / 2); //FIXME can this be removed ?
1486 memset(ch_floor_ptr, 0, sizeof(float) * vc->audio_channels * blocksize / 2); //FIXME can this be removed ?
1487
1488 // Decode floor
1489
1490 for (i = 0; i < vc->audio_channels; ++i) {
1491 vorbis_floor *floor;
1492 if (mapping->submaps > 1) {
1493 floor = &vc->floors[mapping->submap_floor[mapping->mux[i]]];
1494 } else {
1495 floor = &vc->floors[mapping->submap_floor[0]];
1496 }
1497
1498 no_residue[i] = floor->decode(vc, &floor->data, ch_floor_ptr);
1499 ch_floor_ptr += blocksize / 2;
1500 }
1501
1502 // Nonzero vector propagate
1503
1504 for (i = mapping->coupling_steps - 1; i >= 0; --i) {
1505 if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {
1506 no_residue[mapping->magnitude[i]] = 0;
1507 no_residue[mapping->angle[i]] = 0;
1508 }
1509 }
1510
1511 // Decode residue
1512
1513 for (i = 0; i < mapping->submaps; ++i) {
1514 vorbis_residue *residue;
1515 uint_fast8_t ch = 0;
1516
1517 for (j = 0; j < vc->audio_channels; ++j) {
1518 if ((mapping->submaps == 1) || (i == mapping->mux[j])) {
1519 res_chan[j] = res_num;
1520 if (no_residue[j]) {
1521 do_not_decode[ch] = 1;
1522 } else {
1523 do_not_decode[ch] = 0;
1524 }
1525 ++ch;
1526 ++res_num;
1527 }
1528 }
1529 residue = &vc->residues[mapping->submap_residue[i]];
1530 vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);
1531
1532 ch_res_ptr += ch * blocksize / 2;
1533 }
1534
1535 // Inverse coupling
1536
1537 for (i = mapping->coupling_steps - 1; i >= 0; --i) { //warning: i has to be signed
1538 float *mag, *ang;
1539
1540 mag = vc->channel_residues+res_chan[mapping->magnitude[i]] * blocksize / 2;
1541 ang = vc->channel_residues+res_chan[mapping->angle[i]] * blocksize / 2;
1542 vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize / 2);
1543 }
1544
1545 // Dotproduct, MDCT
1546
1547 for (j = vc->audio_channels-1;j >= 0; j--) {
1548 ch_floor_ptr = vc->channel_floors + j * blocksize / 2;
1549 ch_res_ptr = vc->channel_residues + res_chan[j] * blocksize / 2;
1550 vc->dsp.vector_fmul(ch_floor_ptr, ch_res_ptr, blocksize / 2);
1551 ff_imdct_half(&vc->mdct[blockflag], ch_res_ptr, ch_floor_ptr);
1552 }
1553
1554 // Overlap/add, save data for next overlapping FPMATH
1555
1556 retlen = (blocksize + vc->blocksize[previous_window]) / 4;
1557 for (j = 0; j < vc->audio_channels; j++) {
1558 uint_fast16_t bs0 = vc->blocksize[0];
1559 uint_fast16_t bs1 = vc->blocksize[1];
1560 float *residue = vc->channel_residues + res_chan[j] * blocksize / 2;
1561 float *saved = vc->saved + j * bs1 / 4;
1562 float *ret = vc->channel_floors + j * retlen;
1563 float *buf = residue;
1564 const float *win = vc->win[blockflag & previous_window];
1565
1566 if (blockflag == previous_window) {
1567 vc->dsp.vector_fmul_window(ret, saved, buf, win, fadd_bias, blocksize / 4);
1568 } else if (blockflag > previous_window) {
1569 vc->dsp.vector_fmul_window(ret, saved, buf, win, fadd_bias, bs0 / 4);
1570 copy_normalize(ret+bs0/2, buf+bs0/4, (bs1-bs0)/4, vc->exp_bias, fadd_bias);
1571 } else {
1572 copy_normalize(ret, saved, (bs1 - bs0) / 4, vc->exp_bias, fadd_bias);
1573 vc->dsp.vector_fmul_window(ret + (bs1 - bs0) / 4, saved + (bs1 - bs0) / 4, buf, win, fadd_bias, bs0 / 4);
1574 }
1575 memcpy(saved, buf + blocksize / 4, blocksize / 4 * sizeof(float));
1576 }
1577
1578 vc->previous_window = blockflag;
1579 return retlen;
1580 }
1581
1582 // Return the decoded audio packet through the standard api
1583
1584 static int vorbis_decode_frame(AVCodecContext *avccontext,
1585 void *data, int *data_size,
1586 AVPacket *avpkt)
1587 {
1588 const uint8_t *buf = avpkt->data;
1589 int buf_size = avpkt->size;
1590 vorbis_context *vc = avccontext->priv_data ;
1591 GetBitContext *gb = &(vc->gb);
1592 const float *channel_ptrs[vc->audio_channels];
1593 int i;
1594
1595 int_fast16_t len;
1596
1597 if (!buf_size)
1598 return 0;
1599
1600 AV_DEBUG("packet length %d \n", buf_size);
1601
1602 init_get_bits(gb, buf, buf_size*8);
1603
1604 len = vorbis_parse_audio_packet(vc);
1605
1606 if (len <= 0) {
1607 *data_size = 0;
1608 return buf_size;
1609 }
1610
1611 if (!vc->first_frame) {
1612 vc->first_frame = 1;
1613 *data_size = 0;
1614 return buf_size ;
1615 }
1616
1617 AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);
1618
1619 if (vc->audio_channels > 6) {
1620 for (i = 0; i < vc->audio_channels; i++)
1621 channel_ptrs[i] = vc->channel_floors + i * len;
1622 } else {
1623 for (i = 0; i < vc->audio_channels; i++)
1624 channel_ptrs[i] = vc->channel_floors +
1625 len * ff_vorbis_channel_layout_offsets[vc->audio_channels - 1][i];
1626 }
1627
1628 vc->dsp.float_to_int16_interleave(data, channel_ptrs, len, vc->audio_channels);
1629 *data_size = len * 2 * vc->audio_channels;
1630
1631 return buf_size ;
1632 }
1633
1634 // Close decoder
1635
1636 static av_cold int vorbis_decode_close(AVCodecContext *avccontext)
1637 {
1638 vorbis_context *vc = avccontext->priv_data;
1639
1640 vorbis_free(vc);
1641
1642 return 0 ;
1643 }
1644
1645 AVCodec vorbis_decoder = {
1646 "vorbis",
1647 CODEC_TYPE_AUDIO,
1648 CODEC_ID_VORBIS,
1649 sizeof(vorbis_context),
1650 vorbis_decode_init,
1651 NULL,
1652 vorbis_decode_close,
1653 vorbis_decode_frame,
1654 .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),
1655 .channel_layouts = ff_vorbis_channel_layouts,
1656 };
1657
lucabe's unfinished and experimental patches for ffmpeg