1/* 2 * COOK compatible decoder 3 * Copyright (c) 2003 Sascha Sommer 4 * Copyright (c) 2005 Benjamin Larsson 5 * 6 * This file is part of FFmpeg. 7 * 8 * FFmpeg is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU Lesser General Public 10 * License as published by the Free Software Foundation; either 11 * version 2.1 of the License, or (at your option) any later version. 12 * 13 * FFmpeg is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * Lesser General Public License for more details. 17 * 18 * You should have received a copy of the GNU Lesser General Public 19 * License along with FFmpeg; if not, write to the Free Software 20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 21 */ 22 23/** 24 * @file 25 * Cook compatible decoder. Bastardization of the G.722.1 standard. 26 * This decoder handles RealNetworks, RealAudio G2 data. 27 * Cook is identified by the codec name cook in RM files. 28 * 29 * To use this decoder, a calling application must supply the extradata 30 * bytes provided from the RM container; 8+ bytes for mono streams and 31 * 16+ for stereo streams (maybe more). 32 * 33 * Codec technicalities (all this assume a buffer length of 1024): 34 * Cook works with several different techniques to achieve its compression. 35 * In the timedomain the buffer is divided into 8 pieces and quantized. If 36 * two neighboring pieces have different quantization index a smooth 37 * quantization curve is used to get a smooth overlap between the different 38 * pieces. 39 * To get to the transformdomain Cook uses a modulated lapped transform. 40 * The transform domain has 50 subbands with 20 elements each. This 41 * means only a maximum of 50*20=1000 coefficients are used out of the 1024 42 * available. 43 */ 44 45#include <math.h> 46#include <stddef.h> 47#include <stdio.h> 48 49#include "libavutil/lfg.h" 50#include "libavutil/random_seed.h" 51#include "avcodec.h" 52#include "get_bits.h" 53#include "dsputil.h" 54#include "bytestream.h" 55#include "fft.h" 56 57#include "cookdata.h" 58 59/* the different Cook versions */ 60#define MONO 0x1000001 61#define STEREO 0x1000002 62#define JOINT_STEREO 0x1000003 63#define MC_COOK 0x2000000 //multichannel Cook, not supported 64 65#define SUBBAND_SIZE 20 66#define MAX_SUBPACKETS 5 67//#define COOKDEBUG 68 69typedef struct { 70 int *now; 71 int *previous; 72} cook_gains; 73 74typedef struct { 75 int ch_idx; 76 int size; 77 int num_channels; 78 int cookversion; 79 int samples_per_frame; 80 int subbands; 81 int js_subband_start; 82 int js_vlc_bits; 83 int samples_per_channel; 84 int log2_numvector_size; 85 unsigned int channel_mask; 86 VLC ccpl; ///< channel coupling 87 int joint_stereo; 88 int bits_per_subpacket; 89 int bits_per_subpdiv; 90 int total_subbands; 91 int numvector_size; ///< 1 << log2_numvector_size; 92 93 float mono_previous_buffer1[1024]; 94 float mono_previous_buffer2[1024]; 95 /** gain buffers */ 96 cook_gains gains1; 97 cook_gains gains2; 98 int gain_1[9]; 99 int gain_2[9]; 100 int gain_3[9]; 101 int gain_4[9]; 102} COOKSubpacket; 103 104typedef struct cook { 105 /* 106 * The following 5 functions provide the lowlevel arithmetic on 107 * the internal audio buffers. 108 */ 109 void (* scalar_dequant)(struct cook *q, int index, int quant_index, 110 int* subband_coef_index, int* subband_coef_sign, 111 float* mlt_p); 112 113 void (* decouple) (struct cook *q, 114 COOKSubpacket *p, 115 int subband, 116 float f1, float f2, 117 float *decode_buffer, 118 float *mlt_buffer1, float *mlt_buffer2); 119 120 void (* imlt_window) (struct cook *q, float *buffer1, 121 cook_gains *gains_ptr, float *previous_buffer); 122 123 void (* interpolate) (struct cook *q, float* buffer, 124 int gain_index, int gain_index_next); 125 126 void (* saturate_output) (struct cook *q, int chan, int16_t *out); 127 128 AVCodecContext* avctx; 129 GetBitContext gb; 130 /* stream data */ 131 int nb_channels; 132 int bit_rate; 133 int sample_rate; 134 int num_vectors; 135 int samples_per_channel; 136 /* states */ 137 AVLFG random_state; 138 139 /* transform data */ 140 FFTContext mdct_ctx; 141 float* mlt_window; 142 143 /* VLC data */ 144 VLC envelope_quant_index[13]; 145 VLC sqvh[7]; //scalar quantization 146 147 /* generatable tables and related variables */ 148 int gain_size_factor; 149 float gain_table[23]; 150 151 /* data buffers */ 152 153 uint8_t* decoded_bytes_buffer; 154 DECLARE_ALIGNED(16, float,mono_mdct_output)[2048]; 155 float decode_buffer_1[1024]; 156 float decode_buffer_2[1024]; 157 float decode_buffer_0[1060]; /* static allocation for joint decode */ 158 159 const float *cplscales[5]; 160 int num_subpackets; 161 COOKSubpacket subpacket[MAX_SUBPACKETS]; 162} COOKContext; 163 164static float pow2tab[127]; 165static float rootpow2tab[127]; 166 167/* debug functions */ 168 169#ifdef COOKDEBUG 170static void dump_float_table(float* table, int size, int delimiter) { 171 int i=0; 172 av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i); 173 for (i=0 ; i<size ; i++) { 174 av_log(NULL, AV_LOG_ERROR, "%5.1f, ", table[i]); 175 if ((i+1)%delimiter == 0) av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i+1); 176 } 177} 178 179static void dump_int_table(int* table, int size, int delimiter) { 180 int i=0; 181 av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i); 182 for (i=0 ; i<size ; i++) { 183 av_log(NULL, AV_LOG_ERROR, "%d, ", table[i]); 184 if ((i+1)%delimiter == 0) av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i+1); 185 } 186} 187 188static void dump_short_table(short* table, int size, int delimiter) { 189 int i=0; 190 av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i); 191 for (i=0 ; i<size ; i++) { 192 av_log(NULL, AV_LOG_ERROR, "%d, ", table[i]); 193 if ((i+1)%delimiter == 0) av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i+1); 194 } 195} 196 197#endif 198 199/*************** init functions ***************/ 200 201/* table generator */ 202static av_cold void init_pow2table(void){ 203 int i; 204 for (i=-63 ; i<64 ; i++){ 205 pow2tab[63+i]= pow(2, i); 206 rootpow2tab[63+i]=sqrt(pow(2, i)); 207 } 208} 209 210/* table generator */ 211static av_cold void init_gain_table(COOKContext *q) { 212 int i; 213 q->gain_size_factor = q->samples_per_channel/8; 214 for (i=0 ; i<23 ; i++) { 215 q->gain_table[i] = pow(pow2tab[i+52] , 216 (1.0/(double)q->gain_size_factor)); 217 } 218} 219 220 221static av_cold int init_cook_vlc_tables(COOKContext *q) { 222 int i, result; 223 224 result = 0; 225 for (i=0 ; i<13 ; i++) { 226 result |= init_vlc (&q->envelope_quant_index[i], 9, 24, 227 envelope_quant_index_huffbits[i], 1, 1, 228 envelope_quant_index_huffcodes[i], 2, 2, 0); 229 } 230 av_log(q->avctx,AV_LOG_DEBUG,"sqvh VLC init\n"); 231 for (i=0 ; i<7 ; i++) { 232 result |= init_vlc (&q->sqvh[i], vhvlcsize_tab[i], vhsize_tab[i], 233 cvh_huffbits[i], 1, 1, 234 cvh_huffcodes[i], 2, 2, 0); 235 } 236 237 for(i=0;i<q->num_subpackets;i++){ 238 if (q->subpacket[i].joint_stereo==1){ 239 result |= init_vlc (&q->subpacket[i].ccpl, 6, (1<<q->subpacket[i].js_vlc_bits)-1, 240 ccpl_huffbits[q->subpacket[i].js_vlc_bits-2], 1, 1, 241 ccpl_huffcodes[q->subpacket[i].js_vlc_bits-2], 2, 2, 0); 242 av_log(q->avctx,AV_LOG_DEBUG,"subpacket %i Joint-stereo VLC used.\n",i); 243 } 244 } 245 246 av_log(q->avctx,AV_LOG_DEBUG,"VLC tables initialized.\n"); 247 return result; 248} 249 250static av_cold int init_cook_mlt(COOKContext *q) { 251 int j; 252 int mlt_size = q->samples_per_channel; 253 254 if ((q->mlt_window = av_malloc(sizeof(float)*mlt_size)) == 0) 255 return -1; 256 257 /* Initialize the MLT window: simple sine window. */ 258 ff_sine_window_init(q->mlt_window, mlt_size); 259 for(j=0 ; j<mlt_size ; j++) 260 q->mlt_window[j] *= sqrt(2.0 / q->samples_per_channel); 261 262 /* Initialize the MDCT. */ 263 if (ff_mdct_init(&q->mdct_ctx, av_log2(mlt_size)+1, 1, 1.0)) { 264 av_free(q->mlt_window); 265 return -1; 266 } 267 av_log(q->avctx,AV_LOG_DEBUG,"MDCT initialized, order = %d.\n", 268 av_log2(mlt_size)+1); 269 270 return 0; 271} 272 273static const float *maybe_reformat_buffer32 (COOKContext *q, const float *ptr, int n) 274{ 275 if (1) 276 return ptr; 277} 278 279static av_cold void init_cplscales_table (COOKContext *q) { 280 int i; 281 for (i=0;i<5;i++) 282 q->cplscales[i] = maybe_reformat_buffer32 (q, cplscales[i], (1<<(i+2))-1); 283} 284 285/*************** init functions end ***********/ 286 287/** 288 * Cook indata decoding, every 32 bits are XORed with 0x37c511f2. 289 * Why? No idea, some checksum/error detection method maybe. 290 * 291 * Out buffer size: extra bytes are needed to cope with 292 * padding/misalignment. 293 * Subpackets passed to the decoder can contain two, consecutive 294 * half-subpackets, of identical but arbitrary size. 295 * 1234 1234 1234 1234 extraA extraB 296 * Case 1: AAAA BBBB 0 0 297 * Case 2: AAAA ABBB BB-- 3 3 298 * Case 3: AAAA AABB BBBB 2 2 299 * Case 4: AAAA AAAB BBBB BB-- 1 5 300 * 301 * Nice way to waste CPU cycles. 302 * 303 * @param inbuffer pointer to byte array of indata 304 * @param out pointer to byte array of outdata 305 * @param bytes number of bytes 306 */ 307#define DECODE_BYTES_PAD1(bytes) (3 - ((bytes)+3) % 4) 308#define DECODE_BYTES_PAD2(bytes) ((bytes) % 4 + DECODE_BYTES_PAD1(2 * (bytes))) 309 310static inline int decode_bytes(const uint8_t* inbuffer, uint8_t* out, int bytes){ 311 int i, off; 312 uint32_t c; 313 const uint32_t* buf; 314 uint32_t* obuf = (uint32_t*) out; 315 /* FIXME: 64 bit platforms would be able to do 64 bits at a time. 316 * I'm too lazy though, should be something like 317 * for(i=0 ; i<bitamount/64 ; i++) 318 * (int64_t)out[i] = 0x37c511f237c511f2^be2me_64(int64_t)in[i]); 319 * Buffer alignment needs to be checked. */ 320 321 off = (intptr_t)inbuffer & 3; 322 buf = (const uint32_t*) (inbuffer - off); 323 c = be2me_32((0x37c511f2 >> (off*8)) | (0x37c511f2 << (32-(off*8)))); 324 bytes += 3 + off; 325 for (i = 0; i < bytes/4; i++) 326 obuf[i] = c ^ buf[i]; 327 328 return off; 329} 330 331/** 332 * Cook uninit 333 */ 334 335static av_cold int cook_decode_close(AVCodecContext *avctx) 336{ 337 int i; 338 COOKContext *q = avctx->priv_data; 339 av_log(avctx,AV_LOG_DEBUG, "Deallocating memory.\n"); 340 341 /* Free allocated memory buffers. */ 342 av_free(q->mlt_window); 343 av_free(q->decoded_bytes_buffer); 344 345 /* Free the transform. */ 346 ff_mdct_end(&q->mdct_ctx); 347 348 /* Free the VLC tables. */ 349 for (i=0 ; i<13 ; i++) { 350 free_vlc(&q->envelope_quant_index[i]); 351 } 352 for (i=0 ; i<7 ; i++) { 353 free_vlc(&q->sqvh[i]); 354 } 355 for (i=0 ; i<q->num_subpackets ; i++) { 356 free_vlc(&q->subpacket[i].ccpl); 357 } 358 359 av_log(avctx,AV_LOG_DEBUG,"Memory deallocated.\n"); 360 361 return 0; 362} 363 364/** 365 * Fill the gain array for the timedomain quantization. 366 * 367 * @param q pointer to the COOKContext 368 * @param gaininfo[9] array of gain indexes 369 */ 370 371static void decode_gain_info(GetBitContext *gb, int *gaininfo) 372{ 373 int i, n; 374 375 while (get_bits1(gb)) {} 376 n = get_bits_count(gb) - 1; //amount of elements*2 to update 377 378 i = 0; 379 while (n--) { 380 int index = get_bits(gb, 3); 381 int gain = get_bits1(gb) ? get_bits(gb, 4) - 7 : -1; 382 383 while (i <= index) gaininfo[i++] = gain; 384 } 385 while (i <= 8) gaininfo[i++] = 0; 386} 387 388/** 389 * Create the quant index table needed for the envelope. 390 * 391 * @param q pointer to the COOKContext 392 * @param quant_index_table pointer to the array 393 */ 394 395static void decode_envelope(COOKContext *q, COOKSubpacket *p, int* quant_index_table) { 396 int i,j, vlc_index; 397 398 quant_index_table[0]= get_bits(&q->gb,6) - 6; //This is used later in categorize 399 400 for (i=1 ; i < p->total_subbands ; i++){ 401 vlc_index=i; 402 if (i >= p->js_subband_start * 2) { 403 vlc_index-=p->js_subband_start; 404 } else { 405 vlc_index/=2; 406 if(vlc_index < 1) vlc_index = 1; 407 } 408 if (vlc_index>13) vlc_index = 13; //the VLC tables >13 are identical to No. 13 409 410 j = get_vlc2(&q->gb, q->envelope_quant_index[vlc_index-1].table, 411 q->envelope_quant_index[vlc_index-1].bits,2); 412 quant_index_table[i] = quant_index_table[i-1] + j - 12; //differential encoding 413 } 414} 415 416/** 417 * Calculate the category and category_index vector. 418 * 419 * @param q pointer to the COOKContext 420 * @param quant_index_table pointer to the array 421 * @param category pointer to the category array 422 * @param category_index pointer to the category_index array 423 */ 424 425static void categorize(COOKContext *q, COOKSubpacket *p, int* quant_index_table, 426 int* category, int* category_index){ 427 int exp_idx, bias, tmpbias1, tmpbias2, bits_left, num_bits, index, v, i, j; 428 int exp_index2[102]; 429 int exp_index1[102]; 430 431 int tmp_categorize_array[128*2]; 432 int tmp_categorize_array1_idx=p->numvector_size; 433 int tmp_categorize_array2_idx=p->numvector_size; 434 435 bits_left = p->bits_per_subpacket - get_bits_count(&q->gb); 436 437 if(bits_left > q->samples_per_channel) { 438 bits_left = q->samples_per_channel + 439 ((bits_left - q->samples_per_channel)*5)/8; 440 //av_log(q->avctx, AV_LOG_ERROR, "bits_left = %d\n",bits_left); 441 } 442 443 memset(&exp_index1,0,102*sizeof(int)); 444 memset(&exp_index2,0,102*sizeof(int)); 445 memset(&tmp_categorize_array,0,128*2*sizeof(int)); 446 447 bias=-32; 448 449 /* Estimate bias. */ 450 for (i=32 ; i>0 ; i=i/2){ 451 num_bits = 0; 452 index = 0; 453 for (j=p->total_subbands ; j>0 ; j--){ 454 exp_idx = av_clip((i - quant_index_table[index] + bias) / 2, 0, 7); 455 index++; 456 num_bits+=expbits_tab[exp_idx]; 457 } 458 if(num_bits >= bits_left - 32){ 459 bias+=i; 460 } 461 } 462 463 /* Calculate total number of bits. */ 464 num_bits=0; 465 for (i=0 ; i<p->total_subbands ; i++) { 466 exp_idx = av_clip((bias - quant_index_table[i]) / 2, 0, 7); 467 num_bits += expbits_tab[exp_idx]; 468 exp_index1[i] = exp_idx; 469 exp_index2[i] = exp_idx; 470 } 471 tmpbias1 = tmpbias2 = num_bits; 472 473 for (j = 1 ; j < p->numvector_size ; j++) { 474 if (tmpbias1 + tmpbias2 > 2*bits_left) { /* ---> */ 475 int max = -999999; 476 index=-1; 477 for (i=0 ; i<p->total_subbands ; i++){ 478 if (exp_index1[i] < 7) { 479 v = (-2*exp_index1[i]) - quant_index_table[i] + bias; 480 if ( v >= max) { 481 max = v; 482 index = i; 483 } 484 } 485 } 486 if(index==-1)break; 487 tmp_categorize_array[tmp_categorize_array1_idx++] = index; 488 tmpbias1 -= expbits_tab[exp_index1[index]] - 489 expbits_tab[exp_index1[index]+1]; 490 ++exp_index1[index]; 491 } else { /* <--- */ 492 int min = 999999; 493 index=-1; 494 for (i=0 ; i<p->total_subbands ; i++){ 495 if(exp_index2[i] > 0){ 496 v = (-2*exp_index2[i])-quant_index_table[i]+bias; 497 if ( v < min) { 498 min = v; 499 index = i; 500 } 501 } 502 } 503 if(index == -1)break; 504 tmp_categorize_array[--tmp_categorize_array2_idx] = index; 505 tmpbias2 -= expbits_tab[exp_index2[index]] - 506 expbits_tab[exp_index2[index]-1]; 507 --exp_index2[index]; 508 } 509 } 510 511 for(i=0 ; i<p->total_subbands ; i++) 512 category[i] = exp_index2[i]; 513 514 for(i=0 ; i<p->numvector_size-1 ; i++) 515 category_index[i] = tmp_categorize_array[tmp_categorize_array2_idx++]; 516 517} 518 519 520/** 521 * Expand the category vector. 522 * 523 * @param q pointer to the COOKContext 524 * @param category pointer to the category array 525 * @param category_index pointer to the category_index array 526 */ 527 528static inline void expand_category(COOKContext *q, int* category, 529 int* category_index){ 530 int i; 531 for(i=0 ; i<q->num_vectors ; i++){ 532 ++category[category_index[i]]; 533 } 534} 535 536/** 537 * The real requantization of the mltcoefs 538 * 539 * @param q pointer to the COOKContext 540 * @param index index 541 * @param quant_index quantisation index 542 * @param subband_coef_index array of indexes to quant_centroid_tab 543 * @param subband_coef_sign signs of coefficients 544 * @param mlt_p pointer into the mlt buffer 545 */ 546 547static void scalar_dequant_float(COOKContext *q, int index, int quant_index, 548 int* subband_coef_index, int* subband_coef_sign, 549 float* mlt_p){ 550 int i; 551 float f1; 552 553 for(i=0 ; i<SUBBAND_SIZE ; i++) { 554 if (subband_coef_index[i]) { 555 f1 = quant_centroid_tab[index][subband_coef_index[i]]; 556 if (subband_coef_sign[i]) f1 = -f1; 557 } else { 558 /* noise coding if subband_coef_index[i] == 0 */ 559 f1 = dither_tab[index]; 560 if (av_lfg_get(&q->random_state) < 0x80000000) f1 = -f1; 561 } 562 mlt_p[i] = f1 * rootpow2tab[quant_index+63]; 563 } 564} 565/** 566 * Unpack the subband_coef_index and subband_coef_sign vectors. 567 * 568 * @param q pointer to the COOKContext 569 * @param category pointer to the category array 570 * @param subband_coef_index array of indexes to quant_centroid_tab 571 * @param subband_coef_sign signs of coefficients 572 */ 573 574static int unpack_SQVH(COOKContext *q, COOKSubpacket *p, int category, int* subband_coef_index, 575 int* subband_coef_sign) { 576 int i,j; 577 int vlc, vd ,tmp, result; 578 579 vd = vd_tab[category]; 580 result = 0; 581 for(i=0 ; i<vpr_tab[category] ; i++){ 582 vlc = get_vlc2(&q->gb, q->sqvh[category].table, q->sqvh[category].bits, 3); 583 if (p->bits_per_subpacket < get_bits_count(&q->gb)){ 584 vlc = 0; 585 result = 1; 586 } 587 for(j=vd-1 ; j>=0 ; j--){ 588 tmp = (vlc * invradix_tab[category])/0x100000; 589 subband_coef_index[vd*i+j] = vlc - tmp * (kmax_tab[category]+1); 590 vlc = tmp; 591 } 592 for(j=0 ; j<vd ; j++){ 593 if (subband_coef_index[i*vd + j]) { 594 if(get_bits_count(&q->gb) < p->bits_per_subpacket){ 595 subband_coef_sign[i*vd+j] = get_bits1(&q->gb); 596 } else { 597 result=1; 598 subband_coef_sign[i*vd+j]=0; 599 } 600 } else { 601 subband_coef_sign[i*vd+j]=0; 602 } 603 } 604 } 605 return result; 606} 607 608 609/** 610 * Fill the mlt_buffer with mlt coefficients. 611 * 612 * @param q pointer to the COOKContext 613 * @param category pointer to the category array 614 * @param quant_index_table pointer to the array 615 * @param mlt_buffer pointer to mlt coefficients 616 */ 617 618 619static void decode_vectors(COOKContext* q, COOKSubpacket* p, int* category, 620 int *quant_index_table, float* mlt_buffer){ 621 /* A zero in this table means that the subband coefficient is 622 random noise coded. */ 623 int subband_coef_index[SUBBAND_SIZE]; 624 /* A zero in this table means that the subband coefficient is a 625 positive multiplicator. */ 626 int subband_coef_sign[SUBBAND_SIZE]; 627 int band, j; 628 int index=0; 629 630 for(band=0 ; band<p->total_subbands ; band++){ 631 index = category[band]; 632 if(category[band] < 7){ 633 if(unpack_SQVH(q, p, category[band], subband_coef_index, subband_coef_sign)){ 634 index=7; 635 for(j=0 ; j<p->total_subbands ; j++) category[band+j]=7; 636 } 637 } 638 if(index>=7) { 639 memset(subband_coef_index, 0, sizeof(subband_coef_index)); 640 memset(subband_coef_sign, 0, sizeof(subband_coef_sign)); 641 } 642 q->scalar_dequant(q, index, quant_index_table[band], 643 subband_coef_index, subband_coef_sign, 644 &mlt_buffer[band * SUBBAND_SIZE]); 645 } 646 647 if(p->total_subbands*SUBBAND_SIZE >= q->samples_per_channel){ 648 return; 649 } /* FIXME: should this be removed, or moved into loop above? */ 650} 651 652 653/** 654 * function for decoding mono data 655 * 656 * @param q pointer to the COOKContext 657 * @param mlt_buffer pointer to mlt coefficients 658 */ 659 660static void mono_decode(COOKContext *q, COOKSubpacket *p, float* mlt_buffer) { 661 662 int category_index[128]; 663 int quant_index_table[102]; 664 int category[128]; 665 666 memset(&category, 0, 128*sizeof(int)); 667 memset(&category_index, 0, 128*sizeof(int)); 668 669 decode_envelope(q, p, quant_index_table); 670 q->num_vectors = get_bits(&q->gb,p->log2_numvector_size); 671 categorize(q, p, quant_index_table, category, category_index); 672 expand_category(q, category, category_index); 673 decode_vectors(q, p, category, quant_index_table, mlt_buffer); 674} 675 676 677/** 678 * the actual requantization of the timedomain samples 679 * 680 * @param q pointer to the COOKContext 681 * @param buffer pointer to the timedomain buffer 682 * @param gain_index index for the block multiplier 683 * @param gain_index_next index for the next block multiplier 684 */ 685 686static void interpolate_float(COOKContext *q, float* buffer, 687 int gain_index, int gain_index_next){ 688 int i; 689 float fc1, fc2; 690 fc1 = pow2tab[gain_index+63]; 691 692 if(gain_index == gain_index_next){ //static gain 693 for(i=0 ; i<q->gain_size_factor ; i++){ 694 buffer[i]*=fc1; 695 } 696 return; 697 } else { //smooth gain 698 fc2 = q->gain_table[11 + (gain_index_next-gain_index)]; 699 for(i=0 ; i<q->gain_size_factor ; i++){ 700 buffer[i]*=fc1; 701 fc1*=fc2; 702 } 703 return; 704 } 705} 706 707/** 708 * Apply transform window, overlap buffers. 709 * 710 * @param q pointer to the COOKContext 711 * @param inbuffer pointer to the mltcoefficients 712 * @param gains_ptr current and previous gains 713 * @param previous_buffer pointer to the previous buffer to be used for overlapping 714 */ 715 716static void imlt_window_float (COOKContext *q, float *buffer1, 717 cook_gains *gains_ptr, float *previous_buffer) 718{ 719 const float fc = pow2tab[gains_ptr->previous[0] + 63]; 720 int i; 721 /* The weird thing here, is that the two halves of the time domain 722 * buffer are swapped. Also, the newest data, that we save away for 723 * next frame, has the wrong sign. Hence the subtraction below. 724 * Almost sounds like a complex conjugate/reverse data/FFT effect. 725 */ 726 727 /* Apply window and overlap */ 728 for(i = 0; i < q->samples_per_channel; i++){ 729 buffer1[i] = buffer1[i] * fc * q->mlt_window[i] - 730 previous_buffer[i] * q->mlt_window[q->samples_per_channel - 1 - i]; 731 } 732} 733 734/** 735 * The modulated lapped transform, this takes transform coefficients 736 * and transforms them into timedomain samples. 737 * Apply transform window, overlap buffers, apply gain profile 738 * and buffer management. 739 * 740 * @param q pointer to the COOKContext 741 * @param inbuffer pointer to the mltcoefficients 742 * @param gains_ptr current and previous gains 743 * @param previous_buffer pointer to the previous buffer to be used for overlapping 744 */ 745 746static void imlt_gain(COOKContext *q, float *inbuffer, 747 cook_gains *gains_ptr, float* previous_buffer) 748{ 749 float *buffer0 = q->mono_mdct_output; 750 float *buffer1 = q->mono_mdct_output + q->samples_per_channel; 751 int i; 752 753 /* Inverse modified discrete cosine transform */ 754 ff_imdct_calc(&q->mdct_ctx, q->mono_mdct_output, inbuffer); 755 756 q->imlt_window (q, buffer1, gains_ptr, previous_buffer); 757 758 /* Apply gain profile */ 759 for (i = 0; i < 8; i++) { 760 if (gains_ptr->now[i] || gains_ptr->now[i + 1]) 761 q->interpolate(q, &buffer1[q->gain_size_factor * i], 762 gains_ptr->now[i], gains_ptr->now[i + 1]); 763 } 764 765 /* Save away the current to be previous block. */ 766 memcpy(previous_buffer, buffer0, sizeof(float)*q->samples_per_channel); 767} 768 769 770/** 771 * function for getting the jointstereo coupling information 772 * 773 * @param q pointer to the COOKContext 774 * @param decouple_tab decoupling array 775 * 776 */ 777 778static void decouple_info(COOKContext *q, COOKSubpacket *p, int* decouple_tab){ 779 int length, i; 780 781 if(get_bits1(&q->gb)) { 782 if(cplband[p->js_subband_start] > cplband[p->subbands-1]) return; 783 784 length = cplband[p->subbands-1] - cplband[p->js_subband_start] + 1; 785 for (i=0 ; i<length ; i++) { 786 decouple_tab[cplband[p->js_subband_start] + i] = get_vlc2(&q->gb, p->ccpl.table, p->ccpl.bits, 2); 787 } 788 return; 789 } 790 791 if(cplband[p->js_subband_start] > cplband[p->subbands-1]) return; 792 793 length = cplband[p->subbands-1] - cplband[p->js_subband_start] + 1; 794 for (i=0 ; i<length ; i++) { 795 decouple_tab[cplband[p->js_subband_start] + i] = get_bits(&q->gb, p->js_vlc_bits); 796 } 797 return; 798} 799 800/* 801 * function decouples a pair of signals from a single signal via multiplication. 802 * 803 * @param q pointer to the COOKContext 804 * @param subband index of the current subband 805 * @param f1 multiplier for channel 1 extraction 806 * @param f2 multiplier for channel 2 extraction 807 * @param decode_buffer input buffer 808 * @param mlt_buffer1 pointer to left channel mlt coefficients 809 * @param mlt_buffer2 pointer to right channel mlt coefficients 810 */ 811static void decouple_float (COOKContext *q, 812 COOKSubpacket *p, 813 int subband, 814 float f1, float f2, 815 float *decode_buffer, 816 float *mlt_buffer1, float *mlt_buffer2) 817{ 818 int j, tmp_idx; 819 for (j=0 ; j<SUBBAND_SIZE ; j++) { 820 tmp_idx = ((p->js_subband_start + subband)*SUBBAND_SIZE)+j; 821 mlt_buffer1[SUBBAND_SIZE*subband + j] = f1 * decode_buffer[tmp_idx]; 822 mlt_buffer2[SUBBAND_SIZE*subband + j] = f2 * decode_buffer[tmp_idx]; 823 } 824} 825 826/** 827 * function for decoding joint stereo data 828 * 829 * @param q pointer to the COOKContext 830 * @param mlt_buffer1 pointer to left channel mlt coefficients 831 * @param mlt_buffer2 pointer to right channel mlt coefficients 832 */ 833 834static void joint_decode(COOKContext *q, COOKSubpacket *p, float* mlt_buffer1, 835 float* mlt_buffer2) { 836 int i,j; 837 int decouple_tab[SUBBAND_SIZE]; 838 float *decode_buffer = q->decode_buffer_0; 839 int idx, cpl_tmp; 840 float f1,f2; 841 const float* cplscale; 842 843 memset(decouple_tab, 0, sizeof(decouple_tab)); 844 memset(decode_buffer, 0, sizeof(decode_buffer)); 845 846 /* Make sure the buffers are zeroed out. */ 847 memset(mlt_buffer1,0, 1024*sizeof(float)); 848 memset(mlt_buffer2,0, 1024*sizeof(float)); 849 decouple_info(q, p, decouple_tab); 850 mono_decode(q, p, decode_buffer); 851 852 /* The two channels are stored interleaved in decode_buffer. */ 853 for (i=0 ; i<p->js_subband_start ; i++) { 854 for (j=0 ; j<SUBBAND_SIZE ; j++) { 855 mlt_buffer1[i*20+j] = decode_buffer[i*40+j]; 856 mlt_buffer2[i*20+j] = decode_buffer[i*40+20+j]; 857 } 858 } 859 860 /* When we reach js_subband_start (the higher frequencies) 861 the coefficients are stored in a coupling scheme. */ 862 idx = (1 << p->js_vlc_bits) - 1; 863 for (i=p->js_subband_start ; i<p->subbands ; i++) { 864 cpl_tmp = cplband[i]; 865 idx -=decouple_tab[cpl_tmp]; 866 cplscale = q->cplscales[p->js_vlc_bits-2]; //choose decoupler table 867 f1 = cplscale[decouple_tab[cpl_tmp]]; 868 f2 = cplscale[idx-1]; 869 q->decouple (q, p, i, f1, f2, decode_buffer, mlt_buffer1, mlt_buffer2); 870 idx = (1 << p->js_vlc_bits) - 1; 871 } 872} 873 874/** 875 * First part of subpacket decoding: 876 * decode raw stream bytes and read gain info. 877 * 878 * @param q pointer to the COOKContext 879 * @param inbuffer pointer to raw stream data 880 * @param gain_ptr array of current/prev gain pointers 881 */ 882 883static inline void 884decode_bytes_and_gain(COOKContext *q, COOKSubpacket *p, const uint8_t *inbuffer, 885 cook_gains *gains_ptr) 886{ 887 int offset; 888 889 offset = decode_bytes(inbuffer, q->decoded_bytes_buffer, 890 p->bits_per_subpacket/8); 891 init_get_bits(&q->gb, q->decoded_bytes_buffer + offset, 892 p->bits_per_subpacket); 893 decode_gain_info(&q->gb, gains_ptr->now); 894 895 /* Swap current and previous gains */ 896 FFSWAP(int *, gains_ptr->now, gains_ptr->previous); 897} 898 899 /** 900 * Saturate the output signal to signed 16bit integers. 901 * 902 * @param q pointer to the COOKContext 903 * @param chan channel to saturate 904 * @param out pointer to the output vector 905 */ 906static void 907saturate_output_float (COOKContext *q, int chan, int16_t *out) 908{ 909 int j; 910 float *output = q->mono_mdct_output + q->samples_per_channel; 911 /* Clip and convert floats to 16 bits. 912 */ 913 for (j = 0; j < q->samples_per_channel; j++) { 914 out[chan + q->nb_channels * j] = 915 av_clip_int16(lrintf(output[j])); 916 } 917} 918 919/** 920 * Final part of subpacket decoding: 921 * Apply modulated lapped transform, gain compensation, 922 * clip and convert to integer. 923 * 924 * @param q pointer to the COOKContext 925 * @param decode_buffer pointer to the mlt coefficients 926 * @param gain_ptr array of current/prev gain pointers 927 * @param previous_buffer pointer to the previous buffer to be used for overlapping 928 * @param out pointer to the output buffer 929 * @param chan 0: left or single channel, 1: right channel 930 */ 931 932static inline void 933mlt_compensate_output(COOKContext *q, float *decode_buffer, 934 cook_gains *gains, float *previous_buffer, 935 int16_t *out, int chan) 936{ 937 imlt_gain(q, decode_buffer, gains, previous_buffer); 938 q->saturate_output (q, chan, out); 939} 940 941 942/** 943 * Cook subpacket decoding. This function returns one decoded subpacket, 944 * usually 1024 samples per channel. 945 * 946 * @param q pointer to the COOKContext 947 * @param inbuffer pointer to the inbuffer 948 * @param sub_packet_size subpacket size 949 * @param outbuffer pointer to the outbuffer 950 */ 951 952 953static void decode_subpacket(COOKContext *q, COOKSubpacket* p, const uint8_t *inbuffer, int16_t *outbuffer) { 954 int sub_packet_size = p->size; 955 /* packet dump */ 956// for (i=0 ; i<sub_packet_size ; i++) { 957// av_log(q->avctx, AV_LOG_ERROR, "%02x", inbuffer[i]); 958// } 959// av_log(q->avctx, AV_LOG_ERROR, "\n"); 960 memset(q->decode_buffer_1,0,sizeof(q->decode_buffer_1)); 961 decode_bytes_and_gain(q, p, inbuffer, &p->gains1); 962 963 if (p->joint_stereo) { 964 joint_decode(q, p, q->decode_buffer_1, q->decode_buffer_2); 965 } else { 966 mono_decode(q, p, q->decode_buffer_1); 967 968 if (p->num_channels == 2) { 969 decode_bytes_and_gain(q, p, inbuffer + sub_packet_size/2, &p->gains2); 970 mono_decode(q, p, q->decode_buffer_2); 971 } 972 } 973 974 mlt_compensate_output(q, q->decode_buffer_1, &p->gains1, 975 p->mono_previous_buffer1, outbuffer, p->ch_idx); 976 977 if (p->num_channels == 2) { 978 if (p->joint_stereo) { 979 mlt_compensate_output(q, q->decode_buffer_2, &p->gains1, 980 p->mono_previous_buffer2, outbuffer, p->ch_idx + 1); 981 } else { 982 mlt_compensate_output(q, q->decode_buffer_2, &p->gains2, 983 p->mono_previous_buffer2, outbuffer, p->ch_idx + 1); 984 } 985 } 986 987} 988 989 990/** 991 * Cook frame decoding 992 * 993 * @param avctx pointer to the AVCodecContext 994 */ 995 996static int cook_decode_frame(AVCodecContext *avctx, 997 void *data, int *data_size, 998 AVPacket *avpkt) { 999 const uint8_t *buf = avpkt->data; 1000 int buf_size = avpkt->size; 1001 COOKContext *q = avctx->priv_data; 1002 int i; 1003 int offset = 0; 1004 int chidx = 0; 1005 1006 if (buf_size < avctx->block_align) 1007 return buf_size; 1008 1009 /* estimate subpacket sizes */ 1010 q->subpacket[0].size = avctx->block_align; 1011 1012 for(i=1;i<q->num_subpackets;i++){ 1013 q->subpacket[i].size = 2 * buf[avctx->block_align - q->num_subpackets + i]; 1014 q->subpacket[0].size -= q->subpacket[i].size + 1; 1015 if (q->subpacket[0].size < 0) { 1016 av_log(avctx,AV_LOG_DEBUG,"frame subpacket size total > avctx->block_align!\n"); 1017 return -1; 1018 } 1019 } 1020 1021 /* decode supbackets */ 1022 *data_size = 0; 1023 for(i=0;i<q->num_subpackets;i++){ 1024 q->subpacket[i].bits_per_subpacket = (q->subpacket[i].size*8)>>q->subpacket[i].bits_per_subpdiv; 1025 q->subpacket[i].ch_idx = chidx; 1026 av_log(avctx,AV_LOG_DEBUG,"subpacket[%i] size %i js %i %i block_align %i\n",i,q->subpacket[i].size,q->subpacket[i].joint_stereo,offset,avctx->block_align); 1027 decode_subpacket(q, &q->subpacket[i], buf + offset, (int16_t*)data); 1028 offset += q->subpacket[i].size; 1029 chidx += q->subpacket[i].num_channels; 1030 av_log(avctx,AV_LOG_DEBUG,"subpacket[%i] %i %i\n",i,q->subpacket[i].size * 8,get_bits_count(&q->gb)); 1031 } 1032 *data_size = sizeof(int16_t) * q->nb_channels * q->samples_per_channel; 1033 1034 /* Discard the first two frames: no valid audio. */ 1035 if (avctx->frame_number < 2) *data_size = 0; 1036 1037 return avctx->block_align; 1038} 1039 1040#ifdef COOKDEBUG 1041static void dump_cook_context(COOKContext *q) 1042{ 1043 //int i=0; 1044#define PRINT(a,b) av_log(q->avctx,AV_LOG_ERROR," %s = %d\n", a, b); 1045 av_log(q->avctx,AV_LOG_ERROR,"COOKextradata\n"); 1046 av_log(q->avctx,AV_LOG_ERROR,"cookversion=%x\n",q->subpacket[0].cookversion); 1047 if (q->subpacket[0].cookversion > STEREO) { 1048 PRINT("js_subband_start",q->subpacket[0].js_subband_start); 1049 PRINT("js_vlc_bits",q->subpacket[0].js_vlc_bits); 1050 } 1051 av_log(q->avctx,AV_LOG_ERROR,"COOKContext\n"); 1052 PRINT("nb_channels",q->nb_channels); 1053 PRINT("bit_rate",q->bit_rate); 1054 PRINT("sample_rate",q->sample_rate); 1055 PRINT("samples_per_channel",q->subpacket[0].samples_per_channel); 1056 PRINT("samples_per_frame",q->subpacket[0].samples_per_frame); 1057 PRINT("subbands",q->subpacket[0].subbands); 1058 PRINT("random_state",q->random_state); 1059 PRINT("js_subband_start",q->subpacket[0].js_subband_start); 1060 PRINT("log2_numvector_size",q->subpacket[0].log2_numvector_size); 1061 PRINT("numvector_size",q->subpacket[0].numvector_size); 1062 PRINT("total_subbands",q->subpacket[0].total_subbands); 1063} 1064#endif 1065 1066static av_cold int cook_count_channels(unsigned int mask){ 1067 int i; 1068 int channels = 0; 1069 for(i = 0;i<32;i++){ 1070 if(mask & (1<<i)) 1071 ++channels; 1072 } 1073 return channels; 1074} 1075 1076/** 1077 * Cook initialization 1078 * 1079 * @param avctx pointer to the AVCodecContext 1080 */ 1081 1082static av_cold int cook_decode_init(AVCodecContext *avctx) 1083{ 1084 COOKContext *q = avctx->priv_data; 1085 const uint8_t *edata_ptr = avctx->extradata; 1086 const uint8_t *edata_ptr_end = edata_ptr + avctx->extradata_size; 1087 int extradata_size = avctx->extradata_size; 1088 int s = 0; 1089 unsigned int channel_mask = 0; 1090 q->avctx = avctx; 1091 1092 /* Take care of the codec specific extradata. */ 1093 if (extradata_size <= 0) { 1094 av_log(avctx,AV_LOG_ERROR,"Necessary extradata missing!\n"); 1095 return -1; 1096 } 1097 av_log(avctx,AV_LOG_DEBUG,"codecdata_length=%d\n",avctx->extradata_size); 1098 1099 /* Take data from the AVCodecContext (RM container). */ 1100 q->sample_rate = avctx->sample_rate; 1101 q->nb_channels = avctx->channels; 1102 q->bit_rate = avctx->bit_rate; 1103 1104 /* Initialize RNG. */ 1105 av_lfg_init(&q->random_state, 0); 1106 1107 while(edata_ptr < edata_ptr_end){ 1108 /* 8 for mono, 16 for stereo, ? for multichannel 1109 Swap to right endianness so we don't need to care later on. */ 1110 if (extradata_size >= 8){ 1111 q->subpacket[s].cookversion = bytestream_get_be32(&edata_ptr); 1112 q->subpacket[s].samples_per_frame = bytestream_get_be16(&edata_ptr); 1113 q->subpacket[s].subbands = bytestream_get_be16(&edata_ptr); 1114 extradata_size -= 8; 1115 } 1116 if (avctx->extradata_size >= 8){ 1117 bytestream_get_be32(&edata_ptr); //Unknown unused 1118 q->subpacket[s].js_subband_start = bytestream_get_be16(&edata_ptr); 1119 q->subpacket[s].js_vlc_bits = bytestream_get_be16(&edata_ptr); 1120 extradata_size -= 8; 1121 } 1122 1123 /* Initialize extradata related variables. */ 1124 q->subpacket[s].samples_per_channel = q->subpacket[s].samples_per_frame / q->nb_channels; 1125 q->subpacket[s].bits_per_subpacket = avctx->block_align * 8; 1126 1127 /* Initialize default data states. */ 1128 q->subpacket[s].log2_numvector_size = 5; 1129 q->subpacket[s].total_subbands = q->subpacket[s].subbands; 1130 q->subpacket[s].num_channels = 1; 1131 1132 /* Initialize version-dependent variables */ 1133 1134 av_log(avctx,AV_LOG_DEBUG,"subpacket[%i].cookversion=%x\n",s,q->subpacket[s].cookversion); 1135 q->subpacket[s].joint_stereo = 0; 1136 switch (q->subpacket[s].cookversion) { 1137 case MONO: 1138 if (q->nb_channels != 1) { 1139 av_log(avctx,AV_LOG_ERROR,"Container channels != 1, report sample!\n"); 1140 return -1; 1141 } 1142 av_log(avctx,AV_LOG_DEBUG,"MONO\n"); 1143 break; 1144 case STEREO: 1145 if (q->nb_channels != 1) { 1146 q->subpacket[s].bits_per_subpdiv = 1; 1147 q->subpacket[s].num_channels = 2; 1148 } 1149 av_log(avctx,AV_LOG_DEBUG,"STEREO\n"); 1150 break; 1151 case JOINT_STEREO: 1152 if (q->nb_channels != 2) { 1153 av_log(avctx,AV_LOG_ERROR,"Container channels != 2, report sample!\n"); 1154 return -1; 1155 } 1156 av_log(avctx,AV_LOG_DEBUG,"JOINT_STEREO\n"); 1157 if (avctx->extradata_size >= 16){ 1158 q->subpacket[s].total_subbands = q->subpacket[s].subbands + q->subpacket[s].js_subband_start; 1159 q->subpacket[s].joint_stereo = 1; 1160 q->subpacket[s].num_channels = 2; 1161 } 1162 if (q->subpacket[s].samples_per_channel > 256) { 1163 q->subpacket[s].log2_numvector_size = 6; 1164 } 1165 if (q->subpacket[s].samples_per_channel > 512) { 1166 q->subpacket[s].log2_numvector_size = 7; 1167 } 1168 break; 1169 case MC_COOK: 1170 av_log(avctx,AV_LOG_DEBUG,"MULTI_CHANNEL\n"); 1171 if(extradata_size >= 4) 1172 channel_mask |= q->subpacket[s].channel_mask = bytestream_get_be32(&edata_ptr); 1173 1174 if(cook_count_channels(q->subpacket[s].channel_mask) > 1){ 1175 q->subpacket[s].total_subbands = q->subpacket[s].subbands + q->subpacket[s].js_subband_start; 1176 q->subpacket[s].joint_stereo = 1; 1177 q->subpacket[s].num_channels = 2; 1178 q->subpacket[s].samples_per_channel = q->subpacket[s].samples_per_frame >> 1; 1179 1180 if (q->subpacket[s].samples_per_channel > 256) { 1181 q->subpacket[s].log2_numvector_size = 6; 1182 } 1183 if (q->subpacket[s].samples_per_channel > 512) { 1184 q->subpacket[s].log2_numvector_size = 7; 1185 } 1186 }else 1187 q->subpacket[s].samples_per_channel = q->subpacket[s].samples_per_frame; 1188 1189 break; 1190 default: 1191 av_log(avctx,AV_LOG_ERROR,"Unknown Cook version, report sample!\n"); 1192 return -1; 1193 break; 1194 } 1195 1196 if(s > 1 && q->subpacket[s].samples_per_channel != q->samples_per_channel) { 1197 av_log(avctx,AV_LOG_ERROR,"different number of samples per channel!\n"); 1198 return -1; 1199 } else 1200 q->samples_per_channel = q->subpacket[0].samples_per_channel; 1201 1202 1203 /* Initialize variable relations */ 1204 q->subpacket[s].numvector_size = (1 << q->subpacket[s].log2_numvector_size); 1205 1206 /* Try to catch some obviously faulty streams, othervise it might be exploitable */ 1207 if (q->subpacket[s].total_subbands > 53) { 1208 av_log(avctx,AV_LOG_ERROR,"total_subbands > 53, report sample!\n"); 1209 return -1; 1210 } 1211 1212 if ((q->subpacket[s].js_vlc_bits > 6) || (q->subpacket[s].js_vlc_bits < 0)) { 1213 av_log(avctx,AV_LOG_ERROR,"js_vlc_bits = %d, only >= 0 and <= 6 allowed!\n",q->subpacket[s].js_vlc_bits); 1214 return -1; 1215 } 1216 1217 if (q->subpacket[s].subbands > 50) { 1218 av_log(avctx,AV_LOG_ERROR,"subbands > 50, report sample!\n"); 1219 return -1; 1220 } 1221 q->subpacket[s].gains1.now = q->subpacket[s].gain_1; 1222 q->subpacket[s].gains1.previous = q->subpacket[s].gain_2; 1223 q->subpacket[s].gains2.now = q->subpacket[s].gain_3; 1224 q->subpacket[s].gains2.previous = q->subpacket[s].gain_4; 1225 1226 q->num_subpackets++; 1227 s++; 1228 if (s > MAX_SUBPACKETS) { 1229 av_log(avctx,AV_LOG_ERROR,"Too many subpackets > 5, report file!\n"); 1230 return -1; 1231 } 1232 } 1233 /* Generate tables */ 1234 init_pow2table(); 1235 init_gain_table(q); 1236 init_cplscales_table(q); 1237 1238 if (init_cook_vlc_tables(q) != 0) 1239 return -1; 1240 1241 1242 if(avctx->block_align >= UINT_MAX/2) 1243 return -1; 1244 1245 /* Pad the databuffer with: 1246 DECODE_BYTES_PAD1 or DECODE_BYTES_PAD2 for decode_bytes(), 1247 FF_INPUT_BUFFER_PADDING_SIZE, for the bitstreamreader. */ 1248 q->decoded_bytes_buffer = 1249 av_mallocz(avctx->block_align 1250 + DECODE_BYTES_PAD1(avctx->block_align) 1251 + FF_INPUT_BUFFER_PADDING_SIZE); 1252 if (q->decoded_bytes_buffer == NULL) 1253 return -1; 1254 1255 /* Initialize transform. */ 1256 if ( init_cook_mlt(q) != 0 ) 1257 return -1; 1258 1259 /* Initialize COOK signal arithmetic handling */ 1260 if (1) { 1261 q->scalar_dequant = scalar_dequant_float; 1262 q->decouple = decouple_float; 1263 q->imlt_window = imlt_window_float; 1264 q->interpolate = interpolate_float; 1265 q->saturate_output = saturate_output_float; 1266 } 1267 1268 /* Try to catch some obviously faulty streams, othervise it might be exploitable */ 1269 if ((q->samples_per_channel == 256) || (q->samples_per_channel == 512) || (q->samples_per_channel == 1024)) { 1270 } else { 1271 av_log(avctx,AV_LOG_ERROR,"unknown amount of samples_per_channel = %d, report sample!\n",q->samples_per_channel); 1272 return -1; 1273 } 1274 1275 avctx->sample_fmt = SAMPLE_FMT_S16; 1276 if (channel_mask) 1277 avctx->channel_layout = channel_mask; 1278 else 1279 avctx->channel_layout = (avctx->channels==2) ? CH_LAYOUT_STEREO : CH_LAYOUT_MONO; 1280 1281#ifdef COOKDEBUG 1282 dump_cook_context(q); 1283#endif 1284 return 0; 1285} 1286 1287 1288AVCodec cook_decoder = 1289{ 1290 .name = "cook", 1291 .type = AVMEDIA_TYPE_AUDIO, 1292 .id = CODEC_ID_COOK, 1293 .priv_data_size = sizeof(COOKContext), 1294 .init = cook_decode_init, 1295 .close = cook_decode_close, 1296 .decode = cook_decode_frame, 1297 .long_name = NULL_IF_CONFIG_SMALL("COOK"), 1298}; 1299