4 * @author Denes Balatoni ( dbalatoni programozo hu )
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26 #define ALT_BITSTREAM_READER_LE
28 #include "bitstream.h"
35 #define V_MAX_VLCS (1<<16)
44 /* Helper functions */
47 * reads 0-32 bits when using the ALT_BITSTREAM_READER_LE bitstream reader
49 static unsigned int get_bits_long_le(GetBitContext *s, int n){
50 if(n<=17) return get_bits(s, n);
52 int ret= get_bits(s, 16);
53 return ret | (get_bits(s, n-16) << 16);
57 #define ilog(i) av_log2(2*(i))
60 (13.1f*atan(0.00074f*(x))+2.24f*atan(1.85e-8f*(x)*(x))+1e-4f*(x))
62 static unsigned int nth_root(unsigned int x, unsigned int n) { // x^(1/n)
63 unsigned int ret=0, i, j;
67 for(i=0,j=ret;i<n-1;i++) j*=ret;
73 static float vorbisfloat2float(uint_fast32_t val) {
74 double mant=val&0x1fffff;
75 long exp=(val&0x7fe00000L)>>21;
76 if (val&0x80000000) mant=-mant;
77 return(ldexp(mant, exp-20-768));
81 // Generate vlc codes from vorbis huffman code lengths
83 static int vorbis_len2vlc(vorbis_context *vc, uint_fast8_t *bits, uint_fast32_t *codes, uint_fast32_t num) {
84 uint_fast32_t exit_at_level[33]={404,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
85 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
94 for(p=0;(bits[p]==0) && (p<num);++p);
96 // av_log(vc->avccontext, AV_LOG_INFO, "An empty codebook. Heh?! \n");
101 for(i=0;i<bits[p];++i) {
102 exit_at_level[i+1]=1<<i;
106 av_log(vc->avccontext, AV_LOG_INFO, " %d. of %d code len %d code %d - ", p, num, bits[p], codes[p]);
107 init_get_bits(&gb, (uint_fast8_t *)&codes[p], bits[p]);
108 for(i=0;i<bits[p];++i) {
109 av_log(vc->avccontext, AV_LOG_INFO, "%s", get_bits1(&gb) ? "1" : "0");
111 av_log(vc->avccontext, AV_LOG_INFO, "\n");
117 if (bits[p]==0) continue;
118 // find corresponding exit(node which the tree can grow further from)
119 for(i=bits[p];i>0;--i) {
120 if (exit_at_level[i]) break;
122 if (!i) return 1; // overspecified tree
123 code=exit_at_level[i];
125 // construct code (append 0s to end) and introduce new exits
126 for(j=i+1;j<=bits[p];++j) {
127 exit_at_level[j]=code+(1<<(j-1));
132 av_log(vc->avccontext, AV_LOG_INFO, " %d. code len %d code %d - ", p, bits[p], codes[p]);
133 init_get_bits(&gb, (uint_fast8_t *)&codes[p], bits[p]);
134 for(i=0;i<bits[p];++i) {
135 av_log(vc->avccontext, AV_LOG_INFO, "%s", get_bits1(&gb) ? "1" : "0");
137 av_log(vc->avccontext, AV_LOG_INFO, "\n");
142 //FIXME no exits should be left (underspecified tree - ie. unused valid vlcs - not allowed by SPEC)
147 // Free all allocated memory -----------------------------------------
149 static void vorbis_free(vorbis_context *vc) {
152 av_freep(&vc->channel_residues);
153 av_freep(&vc->channel_floors);
154 av_freep(&vc->saved);
157 av_freep(&vc->buf_tmp);
159 av_freep(&vc->residues);
160 av_freep(&vc->modes);
162 ff_mdct_end(&vc->mdct0);
163 ff_mdct_end(&vc->mdct1);
165 for(i=0;i<vc->codebook_count;++i) {
166 av_free(vc->codebooks[i].codevectors);
167 free_vlc(&vc->codebooks[i].vlc);
169 av_freep(&vc->codebooks);
171 for(i=0;i<vc->floor_count;++i) {
172 if(vc->floors[i].floor_type==0) {
173 av_free(vc->floors[i].data.t0.map[0]);
174 av_free(vc->floors[i].data.t0.map[1]);
175 av_free(vc->floors[i].data.t0.book_list);
176 av_free(vc->floors[i].data.t0.lsp);
179 av_free(vc->floors[i].data.t1.x_list);
180 av_free(vc->floors[i].data.t1.x_list_order);
181 av_free(vc->floors[i].data.t1.low_neighbour);
182 av_free(vc->floors[i].data.t1.high_neighbour);
185 av_freep(&vc->floors);
187 for(i=0;i<vc->mapping_count;++i) {
188 av_free(vc->mappings[i].magnitude);
189 av_free(vc->mappings[i].angle);
190 av_free(vc->mappings[i].mux);
192 av_freep(&vc->mappings);
195 // Parse setup header -------------------------------------------------
197 // Process codebooks part
199 static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc) {
201 uint_fast8_t *tmp_vlc_bits;
202 uint_fast32_t *tmp_vlc_codes;
203 GetBitContext *gb=&vc->gb;
205 vc->codebook_count=get_bits(gb,8)+1;
207 AV_DEBUG(" Codebooks: %d \n", vc->codebook_count);
209 vc->codebooks=(vorbis_codebook *)av_mallocz(vc->codebook_count * sizeof(vorbis_codebook));
210 tmp_vlc_bits=(uint_fast8_t *)av_mallocz(V_MAX_VLCS * sizeof(uint_fast8_t));
211 tmp_vlc_codes=(uint_fast32_t *)av_mallocz(V_MAX_VLCS * sizeof(uint_fast32_t));
213 for(cb=0;cb<vc->codebook_count;++cb) {
214 vorbis_codebook *codebook_setup=&vc->codebooks[cb];
215 uint_fast8_t ordered;
216 uint_fast32_t t, used_entries=0;
217 uint_fast32_t entries;
219 AV_DEBUG(" %d. Codebook \n", cb);
221 if (get_bits(gb, 24)!=0x564342) {
222 av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook setup data corrupt. \n", cb);
226 codebook_setup->dimensions=get_bits(gb, 16);
227 if (codebook_setup->dimensions>16) {
228 av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook's dimension is too large (%d). \n", cb, codebook_setup->dimensions);
231 entries=get_bits(gb, 24);
232 if (entries>V_MAX_VLCS) {
233 av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook has too many entries (%"PRIdFAST32"). \n", cb, entries);
237 ordered=get_bits1(gb);
239 AV_DEBUG(" codebook_dimensions %d, codebook_entries %d \n", codebook_setup->dimensions, entries);
244 uint_fast8_t sparse=get_bits1(gb);
246 AV_DEBUG(" not ordered \n");
249 AV_DEBUG(" sparse \n");
252 for(ce=0;ce<entries;++ce) {
255 tmp_vlc_bits[ce]=get_bits(gb, 5)+1;
258 else tmp_vlc_bits[ce]=0;
261 AV_DEBUG(" not sparse \n");
263 used_entries=entries;
264 for(ce=0;ce<entries;++ce) {
265 tmp_vlc_bits[ce]=get_bits(gb, 5)+1;
269 uint_fast16_t current_entry=0;
270 uint_fast8_t current_length=get_bits(gb, 5)+1;
272 AV_DEBUG(" ordered, current length: %d \n", current_length); //FIXME
274 used_entries=entries;
275 for(;current_entry<used_entries;++current_length) {
276 uint_fast16_t i, number;
278 AV_DEBUG(" number bits: %d ", ilog(entries - current_entry));
280 number=get_bits(gb, ilog(entries - current_entry));
282 AV_DEBUG(" number: %d \n", number);
284 for(i=current_entry;i<number+current_entry;++i) {
285 if (i<used_entries) tmp_vlc_bits[i]=current_length;
288 current_entry+=number;
290 if (current_entry>used_entries) {
291 av_log(vc->avccontext, AV_LOG_ERROR, " More codelengths than codes in codebook. \n");
296 codebook_setup->lookup_type=get_bits(gb, 4);
298 AV_DEBUG(" lookup type: %d : %s \n", codebook_setup->lookup_type, codebook_setup->lookup_type ? "vq" : "no lookup" );
300 // If the codebook is used for (inverse) VQ, calculate codevectors.
302 if (codebook_setup->lookup_type==1) {
303 uint_fast16_t i, j, k;
304 uint_fast16_t codebook_lookup_values=nth_root(entries, codebook_setup->dimensions);
305 uint_fast16_t codebook_multiplicands[codebook_lookup_values];
307 float codebook_minimum_value=vorbisfloat2float(get_bits_long_le(gb, 32));
308 float codebook_delta_value=vorbisfloat2float(get_bits_long_le(gb, 32));
309 uint_fast8_t codebook_value_bits=get_bits(gb, 4)+1;
310 uint_fast8_t codebook_sequence_p=get_bits1(gb);
312 AV_DEBUG(" We expect %d numbers for building the codevectors. \n", codebook_lookup_values);
313 AV_DEBUG(" delta %f minmum %f \n", codebook_delta_value, codebook_minimum_value);
315 for(i=0;i<codebook_lookup_values;++i) {
316 codebook_multiplicands[i]=get_bits(gb, codebook_value_bits);
318 AV_DEBUG(" multiplicands*delta+minmum : %e \n", (float)codebook_multiplicands[i]*codebook_delta_value+codebook_minimum_value);
319 AV_DEBUG(" multiplicand %d \n", codebook_multiplicands[i]);
322 // Weed out unused vlcs and build codevector vector
323 codebook_setup->codevectors=(float *)av_mallocz(used_entries*codebook_setup->dimensions * sizeof(float));
324 for(j=0, i=0;i<entries;++i) {
325 uint_fast8_t dim=codebook_setup->dimensions;
327 if (tmp_vlc_bits[i]) {
329 uint_fast32_t lookup_offset=i;
332 av_log(vc->avccontext, AV_LOG_INFO, "Lookup offset %d ,", i);
336 uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values;
337 codebook_setup->codevectors[j*dim+k]=codebook_multiplicands[multiplicand_offset]*codebook_delta_value+codebook_minimum_value+last;
338 if (codebook_sequence_p) {
339 last=codebook_setup->codevectors[j*dim+k];
341 lookup_offset/=codebook_lookup_values;
343 tmp_vlc_bits[j]=tmp_vlc_bits[i];
346 av_log(vc->avccontext, AV_LOG_INFO, "real lookup offset %d, vector: ", j);
348 av_log(vc->avccontext, AV_LOG_INFO, " %f ", codebook_setup->codevectors[j*dim+k]);
350 av_log(vc->avccontext, AV_LOG_INFO, "\n");
356 if (j!=used_entries) {
357 av_log(vc->avccontext, AV_LOG_ERROR, "Bug in codevector vector building code. \n");
360 entries=used_entries;
362 else if (codebook_setup->lookup_type>=2) {
363 av_log(vc->avccontext, AV_LOG_ERROR, "Codebook lookup type not supported. \n");
367 // Initialize VLC table
368 if (vorbis_len2vlc(vc, tmp_vlc_bits, tmp_vlc_codes, entries)) {
369 av_log(vc->avccontext, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");
372 codebook_setup->maxdepth=0;
373 for(t=0;t<entries;++t)
374 if (tmp_vlc_bits[t]>=codebook_setup->maxdepth) codebook_setup->maxdepth=tmp_vlc_bits[t];
376 if(codebook_setup->maxdepth > 3*V_NB_BITS) codebook_setup->nb_bits=V_NB_BITS2;
377 else codebook_setup->nb_bits=V_NB_BITS;
379 codebook_setup->maxdepth=(codebook_setup->maxdepth+codebook_setup->nb_bits-1)/codebook_setup->nb_bits;
381 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)) {
382 av_log(vc->avccontext, AV_LOG_ERROR, " Error generating vlc tables. \n");
387 av_free(tmp_vlc_bits);
388 av_free(tmp_vlc_codes);
393 av_free(tmp_vlc_bits);
394 av_free(tmp_vlc_codes);
398 // Process time domain transforms part (unused in Vorbis I)
400 static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc) {
401 GetBitContext *gb=&vc->gb;
403 uint_fast8_t vorbis_time_count=get_bits(gb, 6)+1;
405 for(i=0;i<vorbis_time_count;++i) {
406 uint_fast16_t vorbis_tdtransform=get_bits(gb, 16);
408 AV_DEBUG(" Vorbis time domain transform %d: %d \n", vorbis_time_count, vorbis_tdtransform);
410 if (vorbis_tdtransform) {
411 av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n");
418 // Process floors part
420 static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,
421 vorbis_floor_data *vfu, float *vec);
422 static void create_map( vorbis_context * vc, uint_fast8_t floor_number );
423 static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc,
424 vorbis_floor_data *vfu, float *vec);
425 static int vorbis_parse_setup_hdr_floors(vorbis_context *vc) {
426 GetBitContext *gb=&vc->gb;
429 vc->floor_count=get_bits(gb, 6)+1;
431 vc->floors=(vorbis_floor *)av_mallocz(vc->floor_count * sizeof(vorbis_floor));
433 for (i=0;i<vc->floor_count;++i) {
434 vorbis_floor *floor_setup=&vc->floors[i];
436 floor_setup->floor_type=get_bits(gb, 16);
438 AV_DEBUG(" %d. floor type %d \n", i, floor_setup->floor_type);
440 if (floor_setup->floor_type==1) {
441 uint_fast8_t maximum_class=0;
442 uint_fast8_t rangebits;
443 uint_fast16_t floor1_values=2;
445 floor_setup->decode=vorbis_floor1_decode;
447 floor_setup->data.t1.partitions=get_bits(gb, 5);
449 AV_DEBUG(" %d.floor: %d partitions \n", i, floor_setup->data.t1.partitions);
451 for(j=0;j<floor_setup->data.t1.partitions;++j) {
452 floor_setup->data.t1.partition_class[j]=get_bits(gb, 4);
453 if (floor_setup->data.t1.partition_class[j]>maximum_class) maximum_class=floor_setup->data.t1.partition_class[j];
455 AV_DEBUG(" %d. floor %d partition class %d \n", i, j, floor_setup->data.t1.partition_class[j]);
459 AV_DEBUG(" maximum class %d \n", maximum_class);
461 floor_setup->data.t1.maximum_class=maximum_class;
463 for(j=0;j<=maximum_class;++j) {
464 floor_setup->data.t1.class_dimensions[j]=get_bits(gb, 3)+1;
465 floor_setup->data.t1.class_subclasses[j]=get_bits(gb, 2);
467 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]);
469 if (floor_setup->data.t1.class_subclasses[j]) {
470 floor_setup->data.t1.class_masterbook[j]=get_bits(gb, 8);
472 AV_DEBUG(" masterbook: %d \n", floor_setup->data.t1.class_masterbook[j]);
475 for(k=0;k<(1<<floor_setup->data.t1.class_subclasses[j]);++k) {
476 floor_setup->data.t1.subclass_books[j][k]=get_bits(gb, 8)-1;
478 AV_DEBUG(" book %d. : %d \n", k, floor_setup->data.t1.subclass_books[j][k]);
482 floor_setup->data.t1.multiplier=get_bits(gb, 2)+1;
483 floor_setup->data.t1.x_list_dim=2;
485 for(j=0;j<floor_setup->data.t1.partitions;++j) {
486 floor_setup->data.t1.x_list_dim+=floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];
489 floor_setup->data.t1.x_list=(uint_fast16_t *)av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(uint_fast16_t));
490 floor_setup->data.t1.x_list_order=(uint_fast16_t *)av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(uint_fast16_t));
491 floor_setup->data.t1.low_neighbour=(uint_fast16_t *)av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(uint_fast16_t));
492 floor_setup->data.t1.high_neighbour=(uint_fast16_t *)av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(uint_fast16_t));
495 rangebits=get_bits(gb, 4);
496 floor_setup->data.t1.x_list[0] = 0;
497 floor_setup->data.t1.x_list[1] = (1<<rangebits);
499 for(j=0;j<floor_setup->data.t1.partitions;++j) {
500 for(k=0;k<floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];++k,++floor1_values) {
501 floor_setup->data.t1.x_list[floor1_values]=get_bits(gb, rangebits);
503 AV_DEBUG(" %d. floor1 Y coord. %d \n", floor1_values, floor_setup->data.t1.x_list[floor1_values]);
507 // Precalculate order of x coordinates - needed for decode
509 for(k=0;k<floor_setup->data.t1.x_list_dim;++k) {
510 floor_setup->data.t1.x_list_order[k]=k;
513 for(k=0;k<floor_setup->data.t1.x_list_dim-1;++k) { // FIXME optimize sorting ?
514 for(j=k+1;j<floor_setup->data.t1.x_list_dim;++j) {
515 if(floor_setup->data.t1.x_list[floor_setup->data.t1.x_list_order[k]]>floor_setup->data.t1.x_list[floor_setup->data.t1.x_list_order[j]]) {
516 uint_fast16_t tmp=floor_setup->data.t1.x_list_order[k];
517 floor_setup->data.t1.x_list_order[k]=floor_setup->data.t1.x_list_order[j];
518 floor_setup->data.t1.x_list_order[j]=tmp;
523 // Precalculate low and high neighbours
525 for(k=2;k<floor_setup->data.t1.x_list_dim;++k) {
526 floor_setup->data.t1.low_neighbour[k]=0;
527 floor_setup->data.t1.high_neighbour[k]=1; // correct according to SPEC requirements
530 if ((floor_setup->data.t1.x_list[j]<floor_setup->data.t1.x_list[k]) &&
531 (floor_setup->data.t1.x_list[j]>floor_setup->data.t1.x_list[floor_setup->data.t1.low_neighbour[k]])) {
532 floor_setup->data.t1.low_neighbour[k]=j;
534 if ((floor_setup->data.t1.x_list[j]>floor_setup->data.t1.x_list[k]) &&
535 (floor_setup->data.t1.x_list[j]<floor_setup->data.t1.x_list[floor_setup->data.t1.high_neighbour[k]])) {
536 floor_setup->data.t1.high_neighbour[k]=j;
541 else if(floor_setup->floor_type==0) {
542 uint_fast8_t max_codebook_dim=0;
544 floor_setup->decode=vorbis_floor0_decode;
546 floor_setup->data.t0.order=get_bits(gb, 8);
547 floor_setup->data.t0.rate=get_bits(gb, 16);
548 floor_setup->data.t0.bark_map_size=get_bits(gb, 16);
549 floor_setup->data.t0.amplitude_bits=get_bits(gb, 6);
550 /* zero would result in a div by zero later *
552 if (floor_setup->data.t0.amplitude_bits == 0) {
553 av_log(vc->avccontext, AV_LOG_ERROR,
554 "Floor 0 amplitude bits is 0.\n");
557 floor_setup->data.t0.amplitude_offset=get_bits(gb, 8);
558 floor_setup->data.t0.num_books=get_bits(gb, 4)+1;
560 /* allocate mem for booklist */
561 floor_setup->data.t0.book_list=
562 av_malloc(floor_setup->data.t0.num_books);
563 if(!floor_setup->data.t0.book_list) { return 1; }
564 /* read book indexes */
567 uint_fast8_t book_idx;
568 for (idx=0;idx<floor_setup->data.t0.num_books;++idx) {
569 book_idx=get_bits(gb, 8);
570 floor_setup->data.t0.book_list[idx]=book_idx;
571 if (vc->codebooks[book_idx].dimensions > max_codebook_dim)
572 max_codebook_dim=vc->codebooks[book_idx].dimensions;
574 if (floor_setup->data.t0.book_list[idx]>vc->codebook_count)
581 /* allocate mem for lsp coefficients */
583 /* codebook dim is for padding if codebook dim doesn't *
584 * divide order+1 then we need to read more data */
585 floor_setup->data.t0.lsp=
586 av_malloc((floor_setup->data.t0.order+1 + max_codebook_dim)
588 if(!floor_setup->data.t0.lsp) { return 1; }
591 #ifdef V_DEBUG /* debug output parsed headers */
592 AV_DEBUG("floor0 order: %u\n", floor_setup->data.t0.order);
593 AV_DEBUG("floor0 rate: %u\n", floor_setup->data.t0.rate);
594 AV_DEBUG("floor0 bark map size: %u\n",
595 floor_setup->data.t0.bark_map_size);
596 AV_DEBUG("floor0 amplitude bits: %u\n",
597 floor_setup->data.t0.amplitude_bits);
598 AV_DEBUG("floor0 amplitude offset: %u\n",
599 floor_setup->data.t0.amplitude_offset);
600 AV_DEBUG("floor0 number of books: %u\n",
601 floor_setup->data.t0.num_books);
602 AV_DEBUG("floor0 book list pointer: %p\n",
603 floor_setup->data.t0.book_list);
606 for (idx=0;idx<floor_setup->data.t0.num_books;++idx) {
607 AV_DEBUG( " Book %d: %u\n",
609 floor_setup->data.t0.book_list[idx] );
615 av_log(vc->avccontext, AV_LOG_ERROR, "Invalid floor type!\n");
622 // Process residues part
624 static int vorbis_parse_setup_hdr_residues(vorbis_context *vc){
625 GetBitContext *gb=&vc->gb;
626 uint_fast8_t i, j, k;
628 vc->residue_count=get_bits(gb, 6)+1;
629 vc->residues=(vorbis_residue *)av_mallocz(vc->residue_count * sizeof(vorbis_residue));
631 AV_DEBUG(" There are %d residues. \n", vc->residue_count);
633 for(i=0;i<vc->residue_count;++i) {
634 vorbis_residue *res_setup=&vc->residues[i];
635 uint_fast8_t cascade[64];
636 uint_fast8_t high_bits;
637 uint_fast8_t low_bits;
639 res_setup->type=get_bits(gb, 16);
641 AV_DEBUG(" %d. residue type %d \n", i, res_setup->type);
643 res_setup->begin=get_bits(gb, 24);
644 res_setup->end=get_bits(gb, 24);
645 res_setup->partition_size=get_bits(gb, 24)+1;
646 res_setup->classifications=get_bits(gb, 6)+1;
647 res_setup->classbook=get_bits(gb, 8);
649 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,
650 res_setup->classifications, res_setup->classbook);
652 for(j=0;j<res_setup->classifications;++j) {
654 low_bits=get_bits(gb, 3);
656 high_bits=get_bits(gb, 5);
658 cascade[j]=(high_bits<<3)+low_bits;
660 AV_DEBUG(" %d class casscade depth: %d \n", j, ilog(cascade[j]));
663 res_setup->maxpass=0;
664 for(j=0;j<res_setup->classifications;++j) {
666 if (cascade[j]&(1<<k)) {
667 res_setup->books[j][k]=get_bits(gb, 8);
669 AV_DEBUG(" %d class casscade depth %d book: %d \n", j, k, res_setup->books[j][k]);
671 if (k>res_setup->maxpass) {
672 res_setup->maxpass=k;
675 res_setup->books[j][k]=-1;
683 // Process mappings part
685 static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc) {
686 GetBitContext *gb=&vc->gb;
689 vc->mapping_count=get_bits(gb, 6)+1;
690 vc->mappings=(vorbis_mapping *)av_mallocz(vc->mapping_count * sizeof(vorbis_mapping));
692 AV_DEBUG(" There are %d mappings. \n", vc->mapping_count);
694 for(i=0;i<vc->mapping_count;++i) {
695 vorbis_mapping *mapping_setup=&vc->mappings[i];
697 if (get_bits(gb, 16)) {
698 av_log(vc->avccontext, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n");
702 mapping_setup->submaps=get_bits(gb, 4)+1;
704 mapping_setup->submaps=1;
708 mapping_setup->coupling_steps=get_bits(gb, 8)+1;
709 mapping_setup->magnitude=(uint_fast8_t *)av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
710 mapping_setup->angle=(uint_fast8_t *)av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
711 for(j=0;j<mapping_setup->coupling_steps;++j) {
712 mapping_setup->magnitude[j]=get_bits(gb, ilog(vc->audio_channels-1));
713 mapping_setup->angle[j]=get_bits(gb, ilog(vc->audio_channels-1));
714 // FIXME: sanity checks
717 mapping_setup->coupling_steps=0;
720 AV_DEBUG(" %d mapping coupling steps: %d \n", i, mapping_setup->coupling_steps);
722 if(get_bits(gb, 2)) {
723 av_log(vc->avccontext, AV_LOG_ERROR, "%d. mapping setup data invalid. \n", i);
724 return 1; // following spec.
727 if (mapping_setup->submaps>1) {
728 mapping_setup->mux=(uint_fast8_t *)av_mallocz(vc->audio_channels * sizeof(uint_fast8_t));
729 for(j=0;j<vc->audio_channels;++j) {
730 mapping_setup->mux[j]=get_bits(gb, 4);
734 for(j=0;j<mapping_setup->submaps;++j) {
735 get_bits(gb, 8); // FIXME check?
736 mapping_setup->submap_floor[j]=get_bits(gb, 8);
737 mapping_setup->submap_residue[j]=get_bits(gb, 8);
739 AV_DEBUG(" %d mapping %d submap : floor %d, residue %d \n", i, j, mapping_setup->submap_floor[j], mapping_setup->submap_residue[j]);
745 // Process modes part
747 static void create_map( vorbis_context * vc, uint_fast8_t floor_number )
749 vorbis_floor * floors=vc->floors;
752 int_fast8_t blockflag;
754 int_fast32_t n; //TODO: could theoretically be smaller?
756 for (blockflag=0;blockflag<2;++blockflag)
758 n=(blockflag ? vc->blocksize_1 : vc->blocksize_0) / 2;
759 floors[floor_number].data.t0.map[blockflag]=
760 av_malloc((n+1) * sizeof(int_fast32_t)); // n+sentinel
762 map=floors[floor_number].data.t0.map[blockflag];
763 vf=&floors[floor_number].data.t0;
765 for (idx=0; idx<n;++idx) {
766 map[idx]=floor( BARK((vf->rate*idx)/(2.0f*n)) *
767 ((vf->bark_map_size)/
768 BARK(vf->rate/2.0f )) );
769 if (vf->bark_map_size-1 < map[idx]) {
770 map[idx]=vf->bark_map_size-1;
774 vf->map_size[blockflag]=n;
778 for(idx=0;idx<=n;++idx) {
779 AV_DEBUG("floor0 map: map at pos %d is %d\n",
785 static int vorbis_parse_setup_hdr_modes(vorbis_context *vc) {
786 GetBitContext *gb=&vc->gb;
789 vc->mode_count=get_bits(gb, 6)+1;
790 vc->modes=(vorbis_mode *)av_mallocz(vc->mode_count * sizeof(vorbis_mode));
792 AV_DEBUG(" There are %d modes.\n", vc->mode_count);
794 for(i=0;i<vc->mode_count;++i) {
795 vorbis_mode *mode_setup=&vc->modes[i];
797 mode_setup->blockflag=get_bits(gb, 1);
798 mode_setup->windowtype=get_bits(gb, 16); //FIXME check
799 mode_setup->transformtype=get_bits(gb, 16); //FIXME check
800 mode_setup->mapping=get_bits(gb, 8); //FIXME check
802 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);
807 // Process the whole setup header using the functions above
809 static int vorbis_parse_setup_hdr(vorbis_context *vc) {
810 GetBitContext *gb=&vc->gb;
812 if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') ||
813 (get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') ||
814 (get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) {
815 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n");
819 if (vorbis_parse_setup_hdr_codebooks(vc)) {
820 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n");
823 if (vorbis_parse_setup_hdr_tdtransforms(vc)) {
824 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n");
827 if (vorbis_parse_setup_hdr_floors(vc)) {
828 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n");
831 if (vorbis_parse_setup_hdr_residues(vc)) {
832 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n");
835 if (vorbis_parse_setup_hdr_mappings(vc)) {
836 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n");
839 if (vorbis_parse_setup_hdr_modes(vc)) {
840 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n");
843 if (!get_bits1(gb)) {
844 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n");
845 return 8; // framing flag bit unset error
851 // Process the identification header
853 static int vorbis_parse_id_hdr(vorbis_context *vc){
854 GetBitContext *gb=&vc->gb;
855 uint_fast8_t bl0, bl1;
856 const float *vwin[8]={ vwin64, vwin128, vwin256, vwin512, vwin1024, vwin2048, vwin4096, vwin8192 };
858 if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') ||
859 (get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') ||
860 (get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) {
861 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n");
865 vc->version=get_bits_long_le(gb, 32); //FIXME check 0
866 vc->audio_channels=get_bits(gb, 8); //FIXME check >0
867 vc->audio_samplerate=get_bits_long_le(gb, 32); //FIXME check >0
868 vc->bitrate_maximum=get_bits_long_le(gb, 32);
869 vc->bitrate_nominal=get_bits_long_le(gb, 32);
870 vc->bitrate_minimum=get_bits_long_le(gb, 32);
873 vc->blocksize_0=(1<<bl0);
874 vc->blocksize_1=(1<<bl1);
875 if (bl0>13 || bl0<6 || bl1>13 || bl1<6) {
876 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n");
879 vc->swin=vwin[bl0-6];
880 vc->lwin=vwin[bl1-6];
882 if ((get_bits1(gb)) == 0) {
883 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n");
887 vc->channel_residues=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
888 vc->channel_floors=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
889 vc->saved=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
890 vc->ret=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
891 vc->buf=(float *)av_malloc(vc->blocksize_1 * sizeof(float));
892 vc->buf_tmp=(float *)av_malloc(vc->blocksize_1 * sizeof(float));
895 ff_mdct_init(&vc->mdct0, bl0, 1);
896 ff_mdct_init(&vc->mdct1, bl1, 1);
898 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 ",
899 vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize_0, vc->blocksize_1);
903 for(i=0;i<BLK/2;++i) {
904 vc->swin[i]=sin(0.5*3.14159265358*(sin(((float)i+0.5)/(float)BLK*3.14159265358))*(sin(((float)i+0.5)/(float)BLK*3.14159265358)));
911 // Process the extradata using the functions above (identification header, setup header)
913 static int vorbis_decode_init(AVCodecContext *avccontext) {
914 vorbis_context *vc = avccontext->priv_data ;
915 uint8_t *headers = avccontext->extradata;
916 int headers_len=avccontext->extradata_size;
917 uint8_t *header_start[3];
919 GetBitContext *gb = &(vc->gb);
922 vc->avccontext = avccontext;
925 av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
929 if(headers[0] == 0 && headers[1] == 30) {
930 for(i = 0; i < 3; i++){
931 header_len[i] = *headers++ << 8;
932 header_len[i] += *headers++;
933 header_start[i] = headers;
934 headers += header_len[i];
936 } else if(headers[0] == 2) {
937 for(j=1,i=0;i<2;++i, ++j) {
939 while(j<headers_len && headers[j]==0xff) {
943 if (j>=headers_len) {
944 av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
947 header_len[i]+=headers[j];
949 header_len[2]=headers_len-header_len[0]-header_len[1]-j;
951 header_start[0] = headers;
952 header_start[1] = header_start[0] + header_len[0];
953 header_start[2] = header_start[1] + header_len[1];
955 av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
959 init_get_bits(gb, header_start[0], header_len[0]*8);
960 hdr_type=get_bits(gb, 8);
962 av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n");
965 if (vorbis_parse_id_hdr(vc)) {
966 av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n");
971 init_get_bits(gb, header_start[2], header_len[2]*8);
972 hdr_type=get_bits(gb, 8);
974 av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");
977 if (vorbis_parse_setup_hdr(vc)) {
978 av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");
983 avccontext->channels = vc->audio_channels;
984 avccontext->sample_rate = vc->audio_samplerate;
989 // Decode audiopackets -------------------------------------------------
991 // Read and decode floor
993 static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,
994 vorbis_floor_data *vfu, float *vec) {
995 vorbis_floor0 * vf=&vfu->t0;
997 uint_fast32_t amplitude;
998 uint_fast32_t book_idx;
999 uint_fast8_t blockflag=vc->modes[vc->mode_number].blockflag;
1001 amplitude=get_bits(&vc->gb, vf->amplitude_bits);
1004 uint_fast16_t lsp_len = 0;
1006 vorbis_codebook codebook;
1008 book_idx=get_bits(&vc->gb, ilog(vf->num_books));
1009 if ( book_idx >= vf->num_books ) {
1010 av_log( vc->avccontext, AV_LOG_ERROR,
1011 "floor0 dec: booknumber too high!\n" );
1014 AV_DEBUG( "floor0 dec: booknumber: %u\n", book_idx );
1015 codebook=vc->codebooks[vf->book_list[book_idx]];
1017 while (lsp_len<vf->order) {
1020 AV_DEBUG( "floor0 dec: book dimension: %d\n", codebook.dimensions );
1021 AV_DEBUG( "floor0 dec: maximum depth: %d\n", codebook.maxdepth );
1022 /* read temp vector */
1023 vec_off=get_vlc2(&vc->gb,
1026 codebook.maxdepth ) *
1027 codebook.dimensions;
1028 AV_DEBUG( "floor0 dec: vector offset: %d\n", vec_off );
1029 /* copy each vector component and add last to it */
1030 for (idx=0; idx<codebook.dimensions; ++idx) {
1031 lsp[lsp_len+idx]=codebook.codevectors[vec_off+idx]+last;
1033 last=lsp[lsp_len+idx-1]; /* set last to last vector component */
1035 lsp_len += codebook.dimensions;
1038 /* DEBUG: output lsp coeffs */
1041 for ( idx = 0; idx < lsp_len; ++idx )
1042 AV_DEBUG("floor0 dec: coeff at %d is %f\n", idx, lsp[idx] );
1046 /* synthesize floor output vector */
1049 int order=vf->order;
1050 float wstep=M_PI/vf->bark_map_size;
1052 for(i=0;i<order;i++) { lsp[i]=2.0f*cos(lsp[i]); }
1054 AV_DEBUG("floor0 synth: map_size=%d; m=%d; wstep=%f\n",
1055 vf->map_size, order, wstep);
1058 while(i<vf->map_size[blockflag]) {
1059 int j, iter_cond=vf->map[blockflag][i];
1062 float two_cos_w=2.0f*cos(wstep*iter_cond); // needed all times
1064 /* similar part for the q and p products */
1065 for(j=0;j<order;j+=2) {
1066 q *= lsp[j] -two_cos_w;
1067 p *= lsp[j+1]-two_cos_w;
1069 if(j==order) { // even order
1070 p *= p*(2.0f-two_cos_w);
1071 q *= q*(2.0f+two_cos_w);
1074 q *= two_cos_w-lsp[j]; // one more time for q
1076 /* final step and square */
1077 p *= p*(4.f-two_cos_w*two_cos_w);
1081 /* calculate linear floor value */
1084 ( (amplitude*vf->amplitude_offset)/
1085 (((1<<vf->amplitude_bits)-1) * sqrt(p+q)) )
1086 - vf->amplitude_offset ) * .11512925f
1091 do { vec[i]=q; ++i; }while(vf->map[blockflag][i]==iter_cond);
1096 /* this channel is unused */
1100 AV_DEBUG(" Floor0 decoded\n");
1104 static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc, vorbis_floor_data *vfu, float *vec) {
1105 vorbis_floor1 * vf=&vfu->t1;
1106 GetBitContext *gb=&vc->gb;
1107 uint_fast16_t range_v[4]={ 256, 128, 86, 64 };
1108 uint_fast16_t range=range_v[vf->multiplier-1];
1109 uint_fast16_t floor1_Y[vf->x_list_dim];
1110 uint_fast16_t floor1_Y_final[vf->x_list_dim];
1111 uint_fast8_t floor1_flag[vf->x_list_dim];
1112 uint_fast8_t class_;
1118 uint_fast16_t offset;
1120 uint_fast16_t *floor_x_sort=vf->x_list_order;
1121 /*u*/int_fast16_t adx, ady, off, predicted; // WTF ? dy/adx= (unsigned)dy/adx ?
1122 int_fast16_t dy, err;
1123 uint_fast16_t lx,hx, ly, hy=0;
1126 if (!get_bits1(gb)) return 1; // silence
1128 // Read values (or differences) for the floor's points
1130 floor1_Y[0]=get_bits(gb, ilog(range-1));
1131 floor1_Y[1]=get_bits(gb, ilog(range-1));
1133 AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);
1136 for(i=0;i<vf->partitions;++i) {
1137 class_=vf->partition_class[i];
1138 cdim=vf->class_dimensions[class_];
1139 cbits=vf->class_subclasses[class_];
1143 AV_DEBUG("Cbits %d \n", cbits);
1145 if (cbits) { // this reads all subclasses for this partition's class
1146 cval=get_vlc2(gb, vc->codebooks[vf->class_masterbook[class_]].vlc.table,
1147 vc->codebooks[vf->class_masterbook[class_]].nb_bits, 3);
1150 for(j=0;j<cdim;++j) {
1151 book=vf->subclass_books[class_][cval & csub];
1153 AV_DEBUG("book %d Cbits %d cval %d bits:%d \n", book, cbits, cval, get_bits_count(gb));
1157 floor1_Y[offset+j]=get_vlc2(gb, vc->codebooks[book].vlc.table,
1158 vc->codebooks[book].nb_bits, 3);
1160 floor1_Y[offset+j]=0;
1163 AV_DEBUG(" floor(%d) = %d \n", vf->x_list[offset+j], floor1_Y[offset+j]);
1168 // Amplitude calculation from the differences
1172 floor1_Y_final[0]=floor1_Y[0];
1173 floor1_Y_final[1]=floor1_Y[1];
1175 for(i=2;i<vf->x_list_dim;++i) {
1176 uint_fast16_t val, highroom, lowroom, room;
1177 uint_fast16_t high_neigh_offs;
1178 uint_fast16_t low_neigh_offs;
1180 low_neigh_offs=vf->low_neighbour[i];
1181 high_neigh_offs=vf->high_neighbour[i];
1182 dy=floor1_Y_final[high_neigh_offs]-floor1_Y_final[low_neigh_offs]; // render_point begin
1183 adx=vf->x_list[high_neigh_offs]-vf->x_list[low_neigh_offs];
1185 err=ady*(vf->x_list[i]-vf->x_list[low_neigh_offs]);
1188 predicted=floor1_Y_final[low_neigh_offs]-off;
1190 predicted=floor1_Y_final[low_neigh_offs]+off;
1191 } // render_point end
1194 highroom=range-predicted;
1196 if (highroom < lowroom) {
1199 room=lowroom*2; // SPEC mispelling
1202 floor1_flag[low_neigh_offs]=1;
1203 floor1_flag[high_neigh_offs]=1;
1206 if (highroom > lowroom) {
1207 floor1_Y_final[i]=val-lowroom+predicted;
1209 floor1_Y_final[i]=predicted-val+highroom-1;
1213 floor1_Y_final[i]=predicted-(val+1)/2;
1215 floor1_Y_final[i]=predicted+val/2;
1220 floor1_Y_final[i]=predicted;
1223 AV_DEBUG(" Decoded floor(%d) = %d / val %d \n", vf->x_list[i], floor1_Y_final[i], val);
1226 // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?
1230 ly=floor1_Y_final[0]*vf->multiplier; // conforms to SPEC
1232 vec[0]=floor1_inverse_db_table[ly];
1234 for(i=1;i<vf->x_list_dim;++i) {
1235 AV_DEBUG(" Looking at post %d \n", i);
1237 if (floor1_flag[floor_x_sort[i]]) { // SPEC mispelled
1238 int_fast16_t x, y, dy, base, sy; // if uncommented: dy = -32 adx = 2 base = 2blablabla ?????
1240 hy=floor1_Y_final[floor_x_sort[i]]*vf->multiplier;
1241 hx=vf->x_list[floor_x_sort[i]];
1245 ady= (dy<0) ? -dy:dy;//ABS(dy);
1248 AV_DEBUG(" dy %d adx %d base %d = %d \n", dy, adx, base, dy/adx);
1258 ady=ady-(base<0 ? -base : base)*adx;
1259 vec[x]=floor1_inverse_db_table[y];
1261 AV_DEBUG(" vec[ %d ] = %d \n", x, y);
1263 for(x=lx+1;(x<hx) && (x<vf->x_list[1]);++x) {
1271 vec[x]=floor1_inverse_db_table[y];
1273 AV_DEBUG(" vec[ %d ] = %d \n", x, y);
1276 /* for(j=1;j<hx-lx+1;++j) { // iterating render_point
1279 ady= dy<0 ? -dy : dy;
1287 if (lx+j < vf->x_list[1]) {
1288 vec[lx+j]=floor1_inverse_db_table[predicted];
1297 if (hx<vf->x_list[1]) {
1298 for(i=hx;i<vf->x_list[1];++i) {
1299 vec[i]=floor1_inverse_db_table[hy];
1303 AV_DEBUG(" Floor decoded\n");
1308 // Read and decode residue
1310 static int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr, uint_fast8_t ch, uint_fast8_t *do_not_decode, float *vec, uint_fast16_t vlen) {
1311 GetBitContext *gb=&vc->gb;
1312 uint_fast8_t c_p_c=vc->codebooks[vr->classbook].dimensions;
1313 uint_fast16_t n_to_read=vr->end-vr->begin;
1314 uint_fast16_t ptns_to_read=n_to_read/vr->partition_size;
1315 uint_fast8_t classifs[ptns_to_read*vc->audio_channels];
1317 uint_fast8_t ch_used;
1323 do_not_decode[0]&=do_not_decode[j]; // FIXME - clobbering input
1325 if (do_not_decode[0]) return 0;
1331 AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d cpc %d \n", ch, c_p_c);
1333 for(pass=0;pass<=vr->maxpass;++pass) { // FIXME OPTIMIZE?
1334 uint_fast16_t voffset;
1335 uint_fast16_t partition_count;
1336 uint_fast16_t j_times_ptns_to_read;
1339 for(partition_count=0;partition_count<ptns_to_read;) { // SPEC error
1341 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {
1342 if (!do_not_decode[j]) {
1343 uint_fast32_t temp=get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,
1344 vc->codebooks[vr->classbook].nb_bits, 3);
1346 AV_DEBUG("Classword: %d \n", temp);
1348 assert(vr->classifications > 1 && vr->classifications<256 && temp<=65536); //needed for inverse[]
1349 for(i=0;i<c_p_c;++i) {
1350 uint_fast32_t temp2;
1352 temp2=(((uint_fast64_t)temp) * inverse[vr->classifications])>>32;
1353 classifs[j_times_ptns_to_read+partition_count+c_p_c-1-i]=temp-temp2*vr->classifications;
1357 j_times_ptns_to_read+=ptns_to_read;
1360 for(i=0;(i<c_p_c) && (partition_count<ptns_to_read);++i) {
1361 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {
1362 uint_fast16_t voffs;
1364 if (!do_not_decode[j]) {
1365 uint_fast8_t vqclass=classifs[j_times_ptns_to_read+partition_count];
1366 int_fast16_t vqbook=vr->books[vqclass][pass];
1369 uint_fast16_t coffs;
1370 uint_fast16_t step=vr->partition_size/vc->codebooks[vqbook].dimensions;
1371 vorbis_codebook codebook= vc->codebooks[vqbook];
1375 voffs=voffset+j*vlen;
1376 for(k=0;k<step;++k) {
1377 coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * codebook.dimensions;
1378 for(l=0;l<codebook.dimensions;++l) {
1379 vec[voffs+k+l*step]+=codebook.codevectors[coffs+l]; // FPMATH
1383 else if (vr->type==1) {
1384 voffs=voffset+j*vlen;
1385 for(k=0;k<step;++k) {
1386 coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * codebook.dimensions;
1387 for(l=0;l<codebook.dimensions;++l, ++voffs) {
1388 vec[voffs]+=codebook.codevectors[coffs+l]; // FPMATH
1390 AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d \n", pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);
1394 else if (vr->type==2 && ch==2 && (voffset&1)==0 && (codebook.dimensions&1)==0) { // most frequent case optimized
1397 for(k=0;k<step;++k) {
1398 coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * codebook.dimensions;
1399 for(l=0;l<codebook.dimensions;l+=2, voffs++) {
1400 vec[voffs ]+=codebook.codevectors[coffs+l ]; // FPMATH
1401 vec[voffs+vlen]+=codebook.codevectors[coffs+l+1]; // FPMATH
1403 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);
1408 else if (vr->type==2) {
1411 for(k=0;k<step;++k) {
1412 coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * codebook.dimensions;
1413 for(l=0;l<codebook.dimensions;++l, ++voffs) {
1414 vec[voffs/ch+(voffs%ch)*vlen]+=codebook.codevectors[coffs+l]; // FPMATH FIXME use if and counter instead of / and %
1416 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);
1420 av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");
1425 j_times_ptns_to_read+=ptns_to_read;
1428 voffset+=vr->partition_size;
1435 // Decode the audio packet using the functions above
1438 static int vorbis_parse_audio_packet(vorbis_context *vc) {
1439 GetBitContext *gb=&vc->gb;
1441 uint_fast8_t previous_window=0,next_window=0;
1442 uint_fast8_t mode_number;
1443 uint_fast16_t blocksize;
1445 uint_fast8_t no_residue[vc->audio_channels];
1446 uint_fast8_t do_not_decode[vc->audio_channels];
1447 vorbis_mapping *mapping;
1448 float *ch_res_ptr=vc->channel_residues;
1449 float *ch_floor_ptr=vc->channel_floors;
1450 uint_fast8_t res_chan[vc->audio_channels];
1451 uint_fast8_t res_num=0;
1452 int_fast16_t retlen=0;
1453 uint_fast16_t saved_start=0;
1455 if (get_bits1(gb)) {
1456 av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");
1457 return -1; // packet type not audio
1460 if (vc->mode_count==1) {
1463 mode_number=get_bits(gb, ilog(vc->mode_count-1));
1465 vc->mode_number=mode_number;
1466 mapping=&vc->mappings[vc->modes[mode_number].mapping];
1468 AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);
1470 if (vc->modes[mode_number].blockflag) {
1471 previous_window=get_bits1(gb);
1472 next_window=get_bits1(gb);
1475 blocksize=vc->modes[mode_number].blockflag ? vc->blocksize_1 : vc->blocksize_0;
1476 memset(ch_res_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?
1477 memset(ch_floor_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?
1481 for(i=0;i<vc->audio_channels;++i) {
1482 vorbis_floor *floor;
1483 if (mapping->submaps>1) {
1484 floor=&vc->floors[mapping->submap_floor[mapping->mux[i]]];
1486 floor=&vc->floors[mapping->submap_floor[0]];
1489 no_residue[i]=floor->decode(vc, &floor->data, ch_floor_ptr);
1490 ch_floor_ptr+=blocksize/2;
1493 // Nonzero vector propagate
1495 for(i=mapping->coupling_steps-1;i>=0;--i) {
1496 if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {
1497 no_residue[mapping->magnitude[i]]=0;
1498 no_residue[mapping->angle[i]]=0;
1504 for(i=0;i<mapping->submaps;++i) {
1505 vorbis_residue *residue;
1508 for(j=0;j<vc->audio_channels;++j) {
1509 if ((mapping->submaps==1) || (i=mapping->mux[j])) {
1510 res_chan[j]=res_num;
1511 if (no_residue[j]) {
1512 do_not_decode[ch]=1;
1514 do_not_decode[ch]=0;
1520 residue=&vc->residues[mapping->submap_residue[i]];
1521 vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);
1523 ch_res_ptr+=ch*blocksize/2;
1528 for(i=mapping->coupling_steps-1;i>=0;--i) { //warning: i has to be signed
1531 mag=vc->channel_residues+res_chan[mapping->magnitude[i]]*blocksize/2;
1532 ang=vc->channel_residues+res_chan[mapping->angle[i]]*blocksize/2;
1533 for(j=0;j<blocksize/2;++j) {
1537 ang[j]=mag[j]-ang[j];
1557 for(j=0, ch_floor_ptr=vc->channel_floors;j<vc->audio_channels;++j,ch_floor_ptr+=blocksize/2) {
1558 ch_res_ptr=vc->channel_residues+res_chan[j]*blocksize/2;
1560 for(i=0;i<blocksize/2;++i) {
1561 ch_floor_ptr[i]*=ch_res_ptr[i]; //FPMATH
1565 // MDCT, overlap/add, save data for next overlapping FPMATH
1567 for(j=0;j<vc->audio_channels;++j) {
1568 uint_fast8_t step=vc->audio_channels;
1570 float *saved=vc->saved+j*vc->blocksize_1/2;
1572 const float *lwin=vc->lwin;
1573 const float *swin=vc->swin;
1575 float *buf_tmp=vc->buf_tmp;
1577 ch_floor_ptr=vc->channel_floors+j*blocksize/2;
1579 saved_start=vc->saved_start;
1581 ff_imdct_calc(vc->modes[mode_number].blockflag ? &vc->mdct1 : &vc->mdct0, buf, ch_floor_ptr, buf_tmp);
1583 if (vc->modes[mode_number].blockflag) {
1585 if (previous_window) {
1586 for(k=j, i=0;i<vc->blocksize_1/2;++i, k+=step) {
1587 ret[k]=saved[i]+buf[i]*lwin[i]+BIAS;
1589 retlen=vc->blocksize_1/2;
1591 buf += (vc->blocksize_1-vc->blocksize_0)/4;
1592 for(k=j, i=0;i<vc->blocksize_0/2;++i, k+=step) {
1593 ret[k]=saved[i]+buf[i]*swin[i]+BIAS;
1595 buf += vc->blocksize_0/2;
1596 for(i=0;i<(vc->blocksize_1-vc->blocksize_0)/4;++i, k+=step) {
1600 retlen=vc->blocksize_0/2+(vc->blocksize_1-vc->blocksize_0)/4;
1604 buf += vc->blocksize_1/2;
1605 lwin += vc->blocksize_1/2-1;
1606 for(i=0;i<vc->blocksize_1/2;++i) {
1607 saved[i]=buf[i]*lwin[-i];
1611 saved_start=(vc->blocksize_1-vc->blocksize_0)/4;
1612 buf += vc->blocksize_1/2;
1613 for(i=0;i<saved_start;++i) {
1616 swin += vc->blocksize_0/2-1;
1617 for(i=0;i<vc->blocksize_0/2;++i) {
1618 saved[saved_start+i]=buf[saved_start+i]*swin[-i];
1623 for(k=j, i=0;i<saved_start;++i, k+=step) {
1624 ret[k]=saved[i]+BIAS;
1626 for(i=0;i<vc->blocksize_0/2;++i, k+=step) {
1627 ret[k]=saved[saved_start+i]+buf[i]*swin[i]+BIAS;
1629 retlen=saved_start+vc->blocksize_0/2;
1631 buf += vc->blocksize_0/2;
1632 swin += vc->blocksize_0/2-1;
1633 for(i=0;i<vc->blocksize_0/2;++i) {
1634 saved[i]=buf[i]*swin[-i];
1639 vc->saved_start=saved_start;
1641 return retlen*vc->audio_channels;
1644 // Return the decoded audio packet through the standard api
1646 static int vorbis_decode_frame(AVCodecContext *avccontext,
1647 void *data, int *data_size,
1648 uint8_t *buf, int buf_size)
1650 vorbis_context *vc = avccontext->priv_data ;
1651 GetBitContext *gb = &(vc->gb);
1653 int_fast16_t i, len;
1659 AV_DEBUG("packet length %d \n", buf_size);
1661 init_get_bits(gb, buf, buf_size*8);
1663 len=vorbis_parse_audio_packet(vc);
1670 if (!vc->first_frame) {
1676 AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);
1678 for(i=0;i<len;++i) {
1679 int_fast32_t tmp= ((int32_t*)vc->ret)[i];
1681 // tmp= (0x43c0ffff - tmp)>>31; //ask gcc devs why this is slower
1682 if(tmp > 0x43c0ffff) tmp= 0xFFFF;
1685 ((int16_t*)data)[i]=tmp - 0x8000;
1695 static int vorbis_decode_close(AVCodecContext *avccontext) {
1696 vorbis_context *vc = avccontext->priv_data;
1703 AVCodec vorbis_decoder = {
1707 sizeof(vorbis_context),
1710 vorbis_decode_close,
1711 vorbis_decode_frame,