1/* 2 * COOK compatible decoder 3 * Copyright (c) 2003 Sascha Sommer 4 * Copyright (c) 2005 Benjamin Larsson 5 * 6 * This file is part of Libav. 7 * 8 * Libav 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 * Libav 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 Libav; 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 "libavutil/lfg.h" 46#include "avcodec.h" 47#include "get_bits.h" 48#include "dsputil.h" 49#include "bytestream.h" 50#include "fft.h" 51#include "libavutil/audioconvert.h" 52#include "sinewin.h" 53 54#include "cookdata.h" 55 56/* the different Cook versions */ 57#define MONO 0x1000001 58#define STEREO 0x1000002 59#define JOINT_STEREO 0x1000003 60#define MC_COOK 0x2000000 // multichannel Cook, not supported 61 62#define SUBBAND_SIZE 20 63#define MAX_SUBPACKETS 5 64 65typedef struct { 66 int *now; 67 int *previous; 68} cook_gains; 69 70typedef struct { 71 int ch_idx; 72 int size; 73 int num_channels; 74 int cookversion; 75 int samples_per_frame; 76 int subbands; 77 int js_subband_start; 78 int js_vlc_bits; 79 int samples_per_channel; 80 int log2_numvector_size; 81 unsigned int channel_mask; 82 VLC ccpl; ///< channel coupling 83 int joint_stereo; 84 int bits_per_subpacket; 85 int bits_per_subpdiv; 86 int total_subbands; 87 int numvector_size; ///< 1 << log2_numvector_size; 88 89 float mono_previous_buffer1[1024]; 90 float mono_previous_buffer2[1024]; 91 /** gain buffers */ 92 cook_gains gains1; 93 cook_gains gains2; 94 int gain_1[9]; 95 int gain_2[9]; 96 int gain_3[9]; 97 int gain_4[9]; 98} COOKSubpacket; 99 100typedef struct cook { 101 /* 102 * The following 5 functions provide the lowlevel arithmetic on 103 * the internal audio buffers. 104 */ 105 void (*scalar_dequant)(struct cook *q, int index, int quant_index, 106 int *subband_coef_index, int *subband_coef_sign, 107 float *mlt_p); 108 109 void (*decouple)(struct cook *q, 110 COOKSubpacket *p, 111 int subband, 112 float f1, float f2, 113 float *decode_buffer, 114 float *mlt_buffer1, float *mlt_buffer2); 115 116 void (*imlt_window)(struct cook *q, float *buffer1, 117 cook_gains *gains_ptr, float *previous_buffer); 118 119 void (*interpolate)(struct cook *q, float *buffer, 120 int gain_index, int gain_index_next); 121 122 void (*saturate_output)(struct cook *q, int chan, float *out); 123 124 AVCodecContext* avctx; 125 AVFrame frame; 126 GetBitContext gb; 127 /* stream data */ 128 int nb_channels; 129 int bit_rate; 130 int sample_rate; 131 int num_vectors; 132 int samples_per_channel; 133 /* states */ 134 AVLFG random_state; 135 int discarded_packets; 136 137 /* transform data */ 138 FFTContext mdct_ctx; 139 float* mlt_window; 140 141 /* VLC data */ 142 VLC envelope_quant_index[13]; 143 VLC sqvh[7]; // scalar quantization 144 145 /* generatable tables and related variables */ 146 int gain_size_factor; 147 float gain_table[23]; 148 149 /* data buffers */ 150 151 uint8_t* decoded_bytes_buffer; 152 DECLARE_ALIGNED(32, float, mono_mdct_output)[2048]; 153 float decode_buffer_1[1024]; 154 float decode_buffer_2[1024]; 155 float decode_buffer_0[1060]; /* static allocation for joint decode */ 156 157 const float *cplscales[5]; 158 int num_subpackets; 159 COOKSubpacket subpacket[MAX_SUBPACKETS]; 160} COOKContext; 161 162static float pow2tab[127]; 163static float rootpow2tab[127]; 164 165/*************** init functions ***************/ 166 167/* table generator */ 168static av_cold void init_pow2table(void) 169{ 170 int i; 171 for (i = -63; i < 64; i++) { 172 pow2tab[63 + i] = pow(2, i); 173 rootpow2tab[63 + i] = sqrt(pow(2, i)); 174 } 175} 176 177/* table generator */ 178static av_cold void init_gain_table(COOKContext *q) 179{ 180 int i; 181 q->gain_size_factor = q->samples_per_channel / 8; 182 for (i = 0; i < 23; i++) 183 q->gain_table[i] = pow(pow2tab[i + 52], 184 (1.0 / (double) q->gain_size_factor)); 185} 186 187 188static av_cold int init_cook_vlc_tables(COOKContext *q) 189{ 190 int i, result; 191 192 result = 0; 193 for (i = 0; i < 13; i++) { 194 result |= init_vlc(&q->envelope_quant_index[i], 9, 24, 195 envelope_quant_index_huffbits[i], 1, 1, 196 envelope_quant_index_huffcodes[i], 2, 2, 0); 197 } 198 av_log(q->avctx, AV_LOG_DEBUG, "sqvh VLC init\n"); 199 for (i = 0; i < 7; i++) { 200 result |= init_vlc(&q->sqvh[i], vhvlcsize_tab[i], vhsize_tab[i], 201 cvh_huffbits[i], 1, 1, 202 cvh_huffcodes[i], 2, 2, 0); 203 } 204 205 for (i = 0; i < q->num_subpackets; i++) { 206 if (q->subpacket[i].joint_stereo == 1) { 207 result |= init_vlc(&q->subpacket[i].ccpl, 6, (1 << q->subpacket[i].js_vlc_bits) - 1, 208 ccpl_huffbits[q->subpacket[i].js_vlc_bits - 2], 1, 1, 209 ccpl_huffcodes[q->subpacket[i].js_vlc_bits - 2], 2, 2, 0); 210 av_log(q->avctx, AV_LOG_DEBUG, "subpacket %i Joint-stereo VLC used.\n", i); 211 } 212 } 213 214 av_log(q->avctx, AV_LOG_DEBUG, "VLC tables initialized.\n"); 215 return result; 216} 217 218static av_cold int init_cook_mlt(COOKContext *q) 219{ 220 int j, ret; 221 int mlt_size = q->samples_per_channel; 222 223 if ((q->mlt_window = av_malloc(mlt_size * sizeof(*q->mlt_window))) == 0) 224 return AVERROR(ENOMEM); 225 226 /* Initialize the MLT window: simple sine window. */ 227 ff_sine_window_init(q->mlt_window, mlt_size); 228 for (j = 0; j < mlt_size; j++) 229 q->mlt_window[j] *= sqrt(2.0 / q->samples_per_channel); 230 231 /* Initialize the MDCT. */ 232 if ((ret = ff_mdct_init(&q->mdct_ctx, av_log2(mlt_size) + 1, 1, 1.0 / 32768.0))) { 233 av_free(q->mlt_window); 234 return ret; 235 } 236 av_log(q->avctx, AV_LOG_DEBUG, "MDCT initialized, order = %d.\n", 237 av_log2(mlt_size) + 1); 238 239 return 0; 240} 241 242static const float *maybe_reformat_buffer32(COOKContext *q, const float *ptr, int n) 243{ 244 if (1) 245 return ptr; 246} 247 248static av_cold void init_cplscales_table(COOKContext *q) 249{ 250 int i; 251 for (i = 0; i < 5; i++) 252 q->cplscales[i] = maybe_reformat_buffer32(q, cplscales[i], (1 << (i + 2)) - 1); 253} 254 255/*************** init functions end ***********/ 256 257#define DECODE_BYTES_PAD1(bytes) (3 - ((bytes) + 3) % 4) 258#define DECODE_BYTES_PAD2(bytes) ((bytes) % 4 + DECODE_BYTES_PAD1(2 * (bytes))) 259 260/** 261 * Cook indata decoding, every 32 bits are XORed with 0x37c511f2. 262 * Why? No idea, some checksum/error detection method maybe. 263 * 264 * Out buffer size: extra bytes are needed to cope with 265 * padding/misalignment. 266 * Subpackets passed to the decoder can contain two, consecutive 267 * half-subpackets, of identical but arbitrary size. 268 * 1234 1234 1234 1234 extraA extraB 269 * Case 1: AAAA BBBB 0 0 270 * Case 2: AAAA ABBB BB-- 3 3 271 * Case 3: AAAA AABB BBBB 2 2 272 * Case 4: AAAA AAAB BBBB BB-- 1 5 273 * 274 * Nice way to waste CPU cycles. 275 * 276 * @param inbuffer pointer to byte array of indata 277 * @param out pointer to byte array of outdata 278 * @param bytes number of bytes 279 */ 280static inline int decode_bytes(const uint8_t *inbuffer, uint8_t *out, int bytes) 281{ 282 static const uint32_t tab[4] = { 283 AV_BE2NE32C(0x37c511f2), AV_BE2NE32C(0xf237c511), 284 AV_BE2NE32C(0x11f237c5), AV_BE2NE32C(0xc511f237), 285 }; 286 int i, off; 287 uint32_t c; 288 const uint32_t *buf; 289 uint32_t *obuf = (uint32_t *) out; 290 /* FIXME: 64 bit platforms would be able to do 64 bits at a time. 291 * I'm too lazy though, should be something like 292 * for (i = 0; i < bitamount / 64; i++) 293 * (int64_t) out[i] = 0x37c511f237c511f2 ^ av_be2ne64(int64_t) in[i]); 294 * Buffer alignment needs to be checked. */ 295 296 off = (intptr_t) inbuffer & 3; 297 buf = (const uint32_t *) (inbuffer - off); 298 c = tab[off]; 299 bytes += 3 + off; 300 for (i = 0; i < bytes / 4; i++) 301 obuf[i] = c ^ buf[i]; 302 303 return off; 304} 305 306/** 307 * Cook uninit 308 */ 309static av_cold int cook_decode_close(AVCodecContext *avctx) 310{ 311 int i; 312 COOKContext *q = avctx->priv_data; 313 av_log(avctx, AV_LOG_DEBUG, "Deallocating memory.\n"); 314 315 /* Free allocated memory buffers. */ 316 av_free(q->mlt_window); 317 av_free(q->decoded_bytes_buffer); 318 319 /* Free the transform. */ 320 ff_mdct_end(&q->mdct_ctx); 321 322 /* Free the VLC tables. */ 323 for (i = 0; i < 13; i++) 324 ff_free_vlc(&q->envelope_quant_index[i]); 325 for (i = 0; i < 7; i++) 326 ff_free_vlc(&q->sqvh[i]); 327 for (i = 0; i < q->num_subpackets; i++) 328 ff_free_vlc(&q->subpacket[i].ccpl); 329 330 av_log(avctx, AV_LOG_DEBUG, "Memory deallocated.\n"); 331 332 return 0; 333} 334 335/** 336 * Fill the gain array for the timedomain quantization. 337 * 338 * @param gb pointer to the GetBitContext 339 * @param gaininfo array[9] of gain indexes 340 */ 341static void decode_gain_info(GetBitContext *gb, int *gaininfo) 342{ 343 int i, n; 344 345 while (get_bits1(gb)) { 346 /* NOTHING */ 347 } 348 349 n = get_bits_count(gb) - 1; // amount of elements*2 to update 350 351 i = 0; 352 while (n--) { 353 int index = get_bits(gb, 3); 354 int gain = get_bits1(gb) ? get_bits(gb, 4) - 7 : -1; 355 356 while (i <= index) 357 gaininfo[i++] = gain; 358 } 359 while (i <= 8) 360 gaininfo[i++] = 0; 361} 362 363/** 364 * Create the quant index table needed for the envelope. 365 * 366 * @param q pointer to the COOKContext 367 * @param quant_index_table pointer to the array 368 */ 369static int decode_envelope(COOKContext *q, COOKSubpacket *p, 370 int *quant_index_table) 371{ 372 int i, j, vlc_index; 373 374 quant_index_table[0] = get_bits(&q->gb, 6) - 6; // This is used later in categorize 375 376 for (i = 1; i < p->total_subbands; i++) { 377 vlc_index = i; 378 if (i >= p->js_subband_start * 2) { 379 vlc_index -= p->js_subband_start; 380 } else { 381 vlc_index /= 2; 382 if (vlc_index < 1) 383 vlc_index = 1; 384 } 385 if (vlc_index > 13) 386 vlc_index = 13; // the VLC tables >13 are identical to No. 13 387 388 j = get_vlc2(&q->gb, q->envelope_quant_index[vlc_index - 1].table, 389 q->envelope_quant_index[vlc_index - 1].bits, 2); 390 quant_index_table[i] = quant_index_table[i - 1] + j - 12; // differential encoding 391 if (quant_index_table[i] > 63 || quant_index_table[i] < -63) { 392 av_log(q->avctx, AV_LOG_ERROR, 393 "Invalid quantizer %d at position %d, outside [-63, 63] range\n", 394 quant_index_table[i], i); 395 return AVERROR_INVALIDDATA; 396 } 397 } 398 399 return 0; 400} 401 402/** 403 * Calculate the category and category_index vector. 404 * 405 * @param q pointer to the COOKContext 406 * @param quant_index_table pointer to the array 407 * @param category pointer to the category array 408 * @param category_index pointer to the category_index array 409 */ 410static void categorize(COOKContext *q, COOKSubpacket *p, int *quant_index_table, 411 int *category, int *category_index) 412{ 413 int exp_idx, bias, tmpbias1, tmpbias2, bits_left, num_bits, index, v, i, j; 414 int exp_index2[102]; 415 int exp_index1[102]; 416 417 int tmp_categorize_array[128 * 2]; 418 int tmp_categorize_array1_idx = p->numvector_size; 419 int tmp_categorize_array2_idx = p->numvector_size; 420 421 bits_left = p->bits_per_subpacket - get_bits_count(&q->gb); 422 423 if (bits_left > q->samples_per_channel) { 424 bits_left = q->samples_per_channel + 425 ((bits_left - q->samples_per_channel) * 5) / 8; 426 //av_log(q->avctx, AV_LOG_ERROR, "bits_left = %d\n",bits_left); 427 } 428 429 memset(&exp_index1, 0, sizeof(exp_index1)); 430 memset(&exp_index2, 0, sizeof(exp_index2)); 431 memset(&tmp_categorize_array, 0, sizeof(tmp_categorize_array)); 432 433 bias = -32; 434 435 /* Estimate bias. */ 436 for (i = 32; i > 0; i = i / 2) { 437 num_bits = 0; 438 index = 0; 439 for (j = p->total_subbands; j > 0; j--) { 440 exp_idx = av_clip((i - quant_index_table[index] + bias) / 2, 0, 7); 441 index++; 442 num_bits += expbits_tab[exp_idx]; 443 } 444 if (num_bits >= bits_left - 32) 445 bias += i; 446 } 447 448 /* Calculate total number of bits. */ 449 num_bits = 0; 450 for (i = 0; i < p->total_subbands; i++) { 451 exp_idx = av_clip((bias - quant_index_table[i]) / 2, 0, 7); 452 num_bits += expbits_tab[exp_idx]; 453 exp_index1[i] = exp_idx; 454 exp_index2[i] = exp_idx; 455 } 456 tmpbias1 = tmpbias2 = num_bits; 457 458 for (j = 1; j < p->numvector_size; j++) { 459 if (tmpbias1 + tmpbias2 > 2 * bits_left) { /* ---> */ 460 int max = -999999; 461 index = -1; 462 for (i = 0; i < p->total_subbands; i++) { 463 if (exp_index1[i] < 7) { 464 v = (-2 * exp_index1[i]) - quant_index_table[i] + bias; 465 if (v >= max) { 466 max = v; 467 index = i; 468 } 469 } 470 } 471 if (index == -1) 472 break; 473 tmp_categorize_array[tmp_categorize_array1_idx++] = index; 474 tmpbias1 -= expbits_tab[exp_index1[index]] - 475 expbits_tab[exp_index1[index] + 1]; 476 ++exp_index1[index]; 477 } else { /* <--- */ 478 int min = 999999; 479 index = -1; 480 for (i = 0; i < p->total_subbands; i++) { 481 if (exp_index2[i] > 0) { 482 v = (-2 * exp_index2[i]) - quant_index_table[i] + bias; 483 if (v < min) { 484 min = v; 485 index = i; 486 } 487 } 488 } 489 if (index == -1) 490 break; 491 tmp_categorize_array[--tmp_categorize_array2_idx] = index; 492 tmpbias2 -= expbits_tab[exp_index2[index]] - 493 expbits_tab[exp_index2[index] - 1]; 494 --exp_index2[index]; 495 } 496 } 497 498 for (i = 0; i < p->total_subbands; i++) 499 category[i] = exp_index2[i]; 500 501 for (i = 0; i < p->numvector_size - 1; i++) 502 category_index[i] = tmp_categorize_array[tmp_categorize_array2_idx++]; 503} 504 505 506/** 507 * Expand the category vector. 508 * 509 * @param q pointer to the COOKContext 510 * @param category pointer to the category array 511 * @param category_index pointer to the category_index array 512 */ 513static inline void expand_category(COOKContext *q, int *category, 514 int *category_index) 515{ 516 int i; 517 for (i = 0; i < q->num_vectors; i++) 518 { 519 int idx = category_index[i]; 520 if (++category[idx] >= FF_ARRAY_ELEMS(dither_tab)) 521 --category[idx]; 522 } 523} 524 525/** 526 * The real requantization of the mltcoefs 527 * 528 * @param q pointer to the COOKContext 529 * @param index index 530 * @param quant_index quantisation index 531 * @param subband_coef_index array of indexes to quant_centroid_tab 532 * @param subband_coef_sign signs of coefficients 533 * @param mlt_p pointer into the mlt buffer 534 */ 535static void scalar_dequant_float(COOKContext *q, int index, int quant_index, 536 int *subband_coef_index, int *subband_coef_sign, 537 float *mlt_p) 538{ 539 int i; 540 float f1; 541 542 for (i = 0; i < SUBBAND_SIZE; i++) { 543 if (subband_coef_index[i]) { 544 f1 = quant_centroid_tab[index][subband_coef_index[i]]; 545 if (subband_coef_sign[i]) 546 f1 = -f1; 547 } else { 548 /* noise coding if subband_coef_index[i] == 0 */ 549 f1 = dither_tab[index]; 550 if (av_lfg_get(&q->random_state) < 0x80000000) 551 f1 = -f1; 552 } 553 mlt_p[i] = f1 * rootpow2tab[quant_index + 63]; 554 } 555} 556/** 557 * Unpack the subband_coef_index and subband_coef_sign vectors. 558 * 559 * @param q pointer to the COOKContext 560 * @param category pointer to the category array 561 * @param subband_coef_index array of indexes to quant_centroid_tab 562 * @param subband_coef_sign signs of coefficients 563 */ 564static int unpack_SQVH(COOKContext *q, COOKSubpacket *p, int category, 565 int *subband_coef_index, int *subband_coef_sign) 566{ 567 int i, j; 568 int vlc, vd, tmp, result; 569 570 vd = vd_tab[category]; 571 result = 0; 572 for (i = 0; i < vpr_tab[category]; i++) { 573 vlc = get_vlc2(&q->gb, q->sqvh[category].table, q->sqvh[category].bits, 3); 574 if (p->bits_per_subpacket < get_bits_count(&q->gb)) { 575 vlc = 0; 576 result = 1; 577 } 578 for (j = vd - 1; j >= 0; j--) { 579 tmp = (vlc * invradix_tab[category]) / 0x100000; 580 subband_coef_index[vd * i + j] = vlc - tmp * (kmax_tab[category] + 1); 581 vlc = tmp; 582 } 583 for (j = 0; j < vd; j++) { 584 if (subband_coef_index[i * vd + j]) { 585 if (get_bits_count(&q->gb) < p->bits_per_subpacket) { 586 subband_coef_sign[i * vd + j] = get_bits1(&q->gb); 587 } else { 588 result = 1; 589 subband_coef_sign[i * vd + j] = 0; 590 } 591 } else { 592 subband_coef_sign[i * vd + j] = 0; 593 } 594 } 595 } 596 return result; 597} 598 599 600/** 601 * Fill the mlt_buffer with mlt coefficients. 602 * 603 * @param q pointer to the COOKContext 604 * @param category pointer to the category array 605 * @param quant_index_table pointer to the array 606 * @param mlt_buffer pointer to mlt coefficients 607 */ 608static void decode_vectors(COOKContext *q, COOKSubpacket *p, int *category, 609 int *quant_index_table, float *mlt_buffer) 610{ 611 /* A zero in this table means that the subband coefficient is 612 random noise coded. */ 613 int subband_coef_index[SUBBAND_SIZE]; 614 /* A zero in this table means that the subband coefficient is a 615 positive multiplicator. */ 616 int subband_coef_sign[SUBBAND_SIZE]; 617 int band, j; 618 int index = 0; 619 620 for (band = 0; band < p->total_subbands; band++) { 621 index = category[band]; 622 if (category[band] < 7) { 623 if (unpack_SQVH(q, p, category[band], subband_coef_index, subband_coef_sign)) { 624 index = 7; 625 for (j = 0; j < p->total_subbands; j++) 626 category[band + j] = 7; 627 } 628 } 629 if (index >= 7) { 630 memset(subband_coef_index, 0, sizeof(subband_coef_index)); 631 memset(subband_coef_sign, 0, sizeof(subband_coef_sign)); 632 } 633 q->scalar_dequant(q, index, quant_index_table[band], 634 subband_coef_index, subband_coef_sign, 635 &mlt_buffer[band * SUBBAND_SIZE]); 636 } 637 638 /* FIXME: should this be removed, or moved into loop above? */ 639 if (p->total_subbands * SUBBAND_SIZE >= q->samples_per_channel) 640 return; 641} 642 643 644/** 645 * function for decoding mono data 646 * 647 * @param q pointer to the COOKContext 648 * @param mlt_buffer pointer to mlt coefficients 649 */ 650static int mono_decode(COOKContext *q, COOKSubpacket *p, float *mlt_buffer) 651{ 652 int category_index[128]; 653 int quant_index_table[102]; 654 int category[128]; 655 int res; 656 657 memset(&category, 0, sizeof(category)); 658 memset(&category_index, 0, sizeof(category_index)); 659 660 if ((res = decode_envelope(q, p, quant_index_table)) < 0) 661 return res; 662 q->num_vectors = get_bits(&q->gb, p->log2_numvector_size); 663 categorize(q, p, quant_index_table, category, category_index); 664 expand_category(q, category, category_index); 665 decode_vectors(q, p, category, quant_index_table, mlt_buffer); 666 667 return 0; 668} 669 670 671/** 672 * the actual requantization of the timedomain samples 673 * 674 * @param q pointer to the COOKContext 675 * @param buffer pointer to the timedomain buffer 676 * @param gain_index index for the block multiplier 677 * @param gain_index_next index for the next block multiplier 678 */ 679static void interpolate_float(COOKContext *q, float *buffer, 680 int gain_index, int gain_index_next) 681{ 682 int i; 683 float fc1, fc2; 684 fc1 = pow2tab[gain_index + 63]; 685 686 if (gain_index == gain_index_next) { // static gain 687 for (i = 0; i < q->gain_size_factor; i++) 688 buffer[i] *= fc1; 689 } else { // smooth gain 690 fc2 = q->gain_table[11 + (gain_index_next - gain_index)]; 691 for (i = 0; i < q->gain_size_factor; i++) { 692 buffer[i] *= fc1; 693 fc1 *= fc2; 694 } 695 } 696} 697 698/** 699 * Apply transform window, overlap buffers. 700 * 701 * @param q pointer to the COOKContext 702 * @param inbuffer pointer to the mltcoefficients 703 * @param gains_ptr current and previous gains 704 * @param previous_buffer pointer to the previous buffer to be used for overlapping 705 */ 706static void imlt_window_float(COOKContext *q, float *inbuffer, 707 cook_gains *gains_ptr, float *previous_buffer) 708{ 709 const float fc = pow2tab[gains_ptr->previous[0] + 63]; 710 int i; 711 /* The weird thing here, is that the two halves of the time domain 712 * buffer are swapped. Also, the newest data, that we save away for 713 * next frame, has the wrong sign. Hence the subtraction below. 714 * Almost sounds like a complex conjugate/reverse data/FFT effect. 715 */ 716 717 /* Apply window and overlap */ 718 for (i = 0; i < q->samples_per_channel; i++) 719 inbuffer[i] = inbuffer[i] * fc * q->mlt_window[i] - 720 previous_buffer[i] * q->mlt_window[q->samples_per_channel - 1 - i]; 721} 722 723/** 724 * The modulated lapped transform, this takes transform coefficients 725 * and transforms them into timedomain samples. 726 * Apply transform window, overlap buffers, apply gain profile 727 * and buffer management. 728 * 729 * @param q pointer to the COOKContext 730 * @param inbuffer pointer to the mltcoefficients 731 * @param gains_ptr current and previous gains 732 * @param previous_buffer pointer to the previous buffer to be used for overlapping 733 */ 734static void imlt_gain(COOKContext *q, float *inbuffer, 735 cook_gains *gains_ptr, float *previous_buffer) 736{ 737 float *buffer0 = q->mono_mdct_output; 738 float *buffer1 = q->mono_mdct_output + q->samples_per_channel; 739 int i; 740 741 /* Inverse modified discrete cosine transform */ 742 q->mdct_ctx.imdct_calc(&q->mdct_ctx, q->mono_mdct_output, inbuffer); 743 744 q->imlt_window(q, buffer1, gains_ptr, previous_buffer); 745 746 /* Apply gain profile */ 747 for (i = 0; i < 8; i++) 748 if (gains_ptr->now[i] || gains_ptr->now[i + 1]) 749 q->interpolate(q, &buffer1[q->gain_size_factor * i], 750 gains_ptr->now[i], gains_ptr->now[i + 1]); 751 752 /* Save away the current to be previous block. */ 753 memcpy(previous_buffer, buffer0, 754 q->samples_per_channel * sizeof(*previous_buffer)); 755} 756 757 758/** 759 * function for getting the jointstereo coupling information 760 * 761 * @param q pointer to the COOKContext 762 * @param decouple_tab decoupling array 763 * 764 */ 765static void decouple_info(COOKContext *q, COOKSubpacket *p, int *decouple_tab) 766{ 767 int i; 768 int vlc = get_bits1(&q->gb); 769 int start = cplband[p->js_subband_start]; 770 int end = cplband[p->subbands - 1]; 771 int length = end - start + 1; 772 773 if (start > end) 774 return; 775 776 if (vlc) 777 for (i = 0; i < length; i++) 778 decouple_tab[start + i] = get_vlc2(&q->gb, p->ccpl.table, p->ccpl.bits, 2); 779 else 780 for (i = 0; i < length; i++) 781 decouple_tab[start + i] = get_bits(&q->gb, p->js_vlc_bits); 782} 783 784/* 785 * function decouples a pair of signals from a single signal via multiplication. 786 * 787 * @param q pointer to the COOKContext 788 * @param subband index of the current subband 789 * @param f1 multiplier for channel 1 extraction 790 * @param f2 multiplier for channel 2 extraction 791 * @param decode_buffer input buffer 792 * @param mlt_buffer1 pointer to left channel mlt coefficients 793 * @param mlt_buffer2 pointer to right channel mlt coefficients 794 */ 795static void decouple_float(COOKContext *q, 796 COOKSubpacket *p, 797 int subband, 798 float f1, float f2, 799 float *decode_buffer, 800 float *mlt_buffer1, float *mlt_buffer2) 801{ 802 int j, tmp_idx; 803 for (j = 0; j < SUBBAND_SIZE; j++) { 804 tmp_idx = ((p->js_subband_start + subband) * SUBBAND_SIZE) + j; 805 mlt_buffer1[SUBBAND_SIZE * subband + j] = f1 * decode_buffer[tmp_idx]; 806 mlt_buffer2[SUBBAND_SIZE * subband + j] = f2 * decode_buffer[tmp_idx]; 807 } 808} 809 810/** 811 * function for decoding joint stereo data 812 * 813 * @param q pointer to the COOKContext 814 * @param mlt_buffer1 pointer to left channel mlt coefficients 815 * @param mlt_buffer2 pointer to right channel mlt coefficients 816 */ 817static int joint_decode(COOKContext *q, COOKSubpacket *p, float *mlt_buffer1, 818 float *mlt_buffer2) 819{ 820 int i, j, res; 821 int decouple_tab[SUBBAND_SIZE]; 822 float *decode_buffer = q->decode_buffer_0; 823 int idx, cpl_tmp; 824 float f1, f2; 825 const float *cplscale; 826 827 memset(decouple_tab, 0, sizeof(decouple_tab)); 828 memset(decode_buffer, 0, sizeof(q->decode_buffer_0)); 829 830 /* Make sure the buffers are zeroed out. */ 831 memset(mlt_buffer1, 0, 1024 * sizeof(*mlt_buffer1)); 832 memset(mlt_buffer2, 0, 1024 * sizeof(*mlt_buffer2)); 833 decouple_info(q, p, decouple_tab); 834 if ((res = mono_decode(q, p, decode_buffer)) < 0) 835 return res; 836 837 /* The two channels are stored interleaved in decode_buffer. */ 838 for (i = 0; i < p->js_subband_start; i++) { 839 for (j = 0; j < SUBBAND_SIZE; j++) { 840 mlt_buffer1[i * 20 + j] = decode_buffer[i * 40 + j]; 841 mlt_buffer2[i * 20 + j] = decode_buffer[i * 40 + 20 + j]; 842 } 843 } 844 845 /* When we reach js_subband_start (the higher frequencies) 846 the coefficients are stored in a coupling scheme. */ 847 idx = (1 << p->js_vlc_bits) - 1; 848 for (i = p->js_subband_start; i < p->subbands; i++) { 849 cpl_tmp = cplband[i]; 850 idx -= decouple_tab[cpl_tmp]; 851 cplscale = q->cplscales[p->js_vlc_bits - 2]; // choose decoupler table 852 f1 = cplscale[decouple_tab[cpl_tmp] + 1]; 853 f2 = cplscale[idx]; 854 q->decouple(q, p, i, f1, f2, decode_buffer, mlt_buffer1, mlt_buffer2); 855 idx = (1 << p->js_vlc_bits) - 1; 856 } 857 858 return 0; 859} 860 861/** 862 * First part of subpacket decoding: 863 * decode raw stream bytes and read gain info. 864 * 865 * @param q pointer to the COOKContext 866 * @param inbuffer pointer to raw stream data 867 * @param gains_ptr array of current/prev gain pointers 868 */ 869static inline void decode_bytes_and_gain(COOKContext *q, COOKSubpacket *p, 870 const uint8_t *inbuffer, 871 cook_gains *gains_ptr) 872{ 873 int offset; 874 875 offset = decode_bytes(inbuffer, q->decoded_bytes_buffer, 876 p->bits_per_subpacket / 8); 877 init_get_bits(&q->gb, q->decoded_bytes_buffer + offset, 878 p->bits_per_subpacket); 879 decode_gain_info(&q->gb, gains_ptr->now); 880 881 /* Swap current and previous gains */ 882 FFSWAP(int *, gains_ptr->now, gains_ptr->previous); 883} 884 885/** 886 * Saturate the output signal and interleave. 887 * 888 * @param q pointer to the COOKContext 889 * @param chan channel to saturate 890 * @param out pointer to the output vector 891 */ 892static void saturate_output_float(COOKContext *q, int chan, float *out) 893{ 894 int j; 895 float *output = q->mono_mdct_output + q->samples_per_channel; 896 for (j = 0; j < q->samples_per_channel; j++) { 897 out[chan + q->nb_channels * j] = av_clipf(output[j], -1.0, 1.0); 898 } 899} 900 901/** 902 * Final part of subpacket decoding: 903 * Apply modulated lapped transform, gain compensation, 904 * clip and convert to integer. 905 * 906 * @param q pointer to the COOKContext 907 * @param decode_buffer pointer to the mlt coefficients 908 * @param gains_ptr array of current/prev gain pointers 909 * @param previous_buffer pointer to the previous buffer to be used for overlapping 910 * @param out pointer to the output buffer 911 * @param chan 0: left or single channel, 1: right channel 912 */ 913static inline void mlt_compensate_output(COOKContext *q, float *decode_buffer, 914 cook_gains *gains_ptr, float *previous_buffer, 915 float *out, int chan) 916{ 917 imlt_gain(q, decode_buffer, gains_ptr, previous_buffer); 918 if (out) 919 q->saturate_output(q, chan, out); 920} 921 922 923/** 924 * Cook subpacket decoding. This function returns one decoded subpacket, 925 * usually 1024 samples per channel. 926 * 927 * @param q pointer to the COOKContext 928 * @param inbuffer pointer to the inbuffer 929 * @param outbuffer pointer to the outbuffer 930 */ 931static int decode_subpacket(COOKContext *q, COOKSubpacket *p, 932 const uint8_t *inbuffer, float *outbuffer) 933{ 934 int sub_packet_size = p->size; 935 int res; 936 /* packet dump */ 937 // for (i = 0; i < sub_packet_size ; i++) 938 // av_log(q->avctx, AV_LOG_ERROR, "%02x", inbuffer[i]); 939 // av_log(q->avctx, AV_LOG_ERROR, "\n"); 940 memset(q->decode_buffer_1, 0, sizeof(q->decode_buffer_1)); 941 decode_bytes_and_gain(q, p, inbuffer, &p->gains1); 942 943 if (p->joint_stereo) { 944 if ((res = joint_decode(q, p, q->decode_buffer_1, q->decode_buffer_2)) < 0) 945 return res; 946 } else { 947 if ((res = mono_decode(q, p, q->decode_buffer_1)) < 0) 948 return res; 949 950 if (p->num_channels == 2) { 951 decode_bytes_and_gain(q, p, inbuffer + sub_packet_size / 2, &p->gains2); 952 if ((res = mono_decode(q, p, q->decode_buffer_2)) < 0) 953 return res; 954 } 955 } 956 957 mlt_compensate_output(q, q->decode_buffer_1, &p->gains1, 958 p->mono_previous_buffer1, outbuffer, p->ch_idx); 959 960 if (p->num_channels == 2) 961 if (p->joint_stereo) 962 mlt_compensate_output(q, q->decode_buffer_2, &p->gains1, 963 p->mono_previous_buffer2, outbuffer, p->ch_idx + 1); 964 else 965 mlt_compensate_output(q, q->decode_buffer_2, &p->gains2, 966 p->mono_previous_buffer2, outbuffer, p->ch_idx + 1); 967 968 return 0; 969} 970 971 972/** 973 * Cook frame decoding 974 * 975 * @param avctx pointer to the AVCodecContext 976 */ 977static int cook_decode_frame(AVCodecContext *avctx, void *data, 978 int *got_frame_ptr, AVPacket *avpkt) 979{ 980 const uint8_t *buf = avpkt->data; 981 int buf_size = avpkt->size; 982 COOKContext *q = avctx->priv_data; 983 float *samples = NULL; 984 int i, ret; 985 int offset = 0; 986 int chidx = 0; 987 988 if (buf_size < avctx->block_align) 989 return buf_size; 990 991 /* get output buffer */ 992 if (q->discarded_packets >= 2) { 993 q->frame.nb_samples = q->samples_per_channel; 994 if ((ret = avctx->get_buffer(avctx, &q->frame)) < 0) { 995 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); 996 return ret; 997 } 998 samples = (float *) q->frame.data[0]; 999 } 1000 1001 /* estimate subpacket sizes */ 1002 q->subpacket[0].size = avctx->block_align; 1003 1004 for (i = 1; i < q->num_subpackets; i++) { 1005 q->subpacket[i].size = 2 * buf[avctx->block_align - q->num_subpackets + i]; 1006 q->subpacket[0].size -= q->subpacket[i].size + 1; 1007 if (q->subpacket[0].size < 0) { 1008 av_log(avctx, AV_LOG_DEBUG, 1009 "frame subpacket size total > avctx->block_align!\n"); 1010 return AVERROR_INVALIDDATA; 1011 } 1012 } 1013 1014 /* decode supbackets */ 1015 for (i = 0; i < q->num_subpackets; i++) { 1016 q->subpacket[i].bits_per_subpacket = (q->subpacket[i].size * 8) >> 1017 q->subpacket[i].bits_per_subpdiv; 1018 q->subpacket[i].ch_idx = chidx; 1019 av_log(avctx, AV_LOG_DEBUG, 1020 "subpacket[%i] size %i js %i %i block_align %i\n", 1021 i, q->subpacket[i].size, q->subpacket[i].joint_stereo, offset, 1022 avctx->block_align); 1023 1024 if ((ret = decode_subpacket(q, &q->subpacket[i], buf + offset, samples)) < 0) 1025 return ret; 1026 offset += q->subpacket[i].size; 1027 chidx += q->subpacket[i].num_channels; 1028 av_log(avctx, AV_LOG_DEBUG, "subpacket[%i] %i %i\n", 1029 i, q->subpacket[i].size * 8, get_bits_count(&q->gb)); 1030 } 1031 1032 /* Discard the first two frames: no valid audio. */ 1033 if (q->discarded_packets < 2) { 1034 q->discarded_packets++; 1035 *got_frame_ptr = 0; 1036 return avctx->block_align; 1037 } 1038 1039 *got_frame_ptr = 1; 1040 *(AVFrame *) data = q->frame; 1041 1042 return avctx->block_align; 1043} 1044 1045#ifdef DEBUG 1046static void dump_cook_context(COOKContext *q) 1047{ 1048 //int i=0; 1049#define PRINT(a, b) av_log(q->avctx, AV_LOG_ERROR, " %s = %d\n", a, b); 1050 av_log(q->avctx, AV_LOG_ERROR, "COOKextradata\n"); 1051 av_log(q->avctx, AV_LOG_ERROR, "cookversion=%x\n", q->subpacket[0].cookversion); 1052 if (q->subpacket[0].cookversion > STEREO) { 1053 PRINT("js_subband_start", q->subpacket[0].js_subband_start); 1054 PRINT("js_vlc_bits", q->subpacket[0].js_vlc_bits); 1055 } 1056 av_log(q->avctx, AV_LOG_ERROR, "COOKContext\n"); 1057 PRINT("nb_channels", q->nb_channels); 1058 PRINT("bit_rate", q->bit_rate); 1059 PRINT("sample_rate", q->sample_rate); 1060 PRINT("samples_per_channel", q->subpacket[0].samples_per_channel); 1061 PRINT("samples_per_frame", q->subpacket[0].samples_per_frame); 1062 PRINT("subbands", q->subpacket[0].subbands); 1063 PRINT("js_subband_start", q->subpacket[0].js_subband_start); 1064 PRINT("log2_numvector_size", q->subpacket[0].log2_numvector_size); 1065 PRINT("numvector_size", q->subpacket[0].numvector_size); 1066 PRINT("total_subbands", q->subpacket[0].total_subbands); 1067} 1068#endif 1069 1070static av_cold int cook_count_channels(unsigned int mask) 1071{ 1072 int i; 1073 int channels = 0; 1074 for (i = 0; i < 32; i++) 1075 if (mask & (1 << i)) 1076 ++channels; 1077 return channels; 1078} 1079 1080/** 1081 * Cook initialization 1082 * 1083 * @param avctx pointer to the AVCodecContext 1084 */ 1085static av_cold int cook_decode_init(AVCodecContext *avctx) 1086{ 1087 COOKContext *q = avctx->priv_data; 1088 const uint8_t *edata_ptr = avctx->extradata; 1089 const uint8_t *edata_ptr_end = edata_ptr + avctx->extradata_size; 1090 int extradata_size = avctx->extradata_size; 1091 int s = 0; 1092 unsigned int channel_mask = 0; 1093 int ret; 1094 q->avctx = avctx; 1095 1096 /* Take care of the codec specific extradata. */ 1097 if (extradata_size <= 0) { 1098 av_log(avctx, AV_LOG_ERROR, "Necessary extradata missing!\n"); 1099 return AVERROR_INVALIDDATA; 1100 } 1101 av_log(avctx, AV_LOG_DEBUG, "codecdata_length=%d\n", avctx->extradata_size); 1102 1103 /* Take data from the AVCodecContext (RM container). */ 1104 q->sample_rate = avctx->sample_rate; 1105 q->nb_channels = avctx->channels; 1106 q->bit_rate = avctx->bit_rate; 1107 if (!q->nb_channels) { 1108 av_log(avctx, AV_LOG_ERROR, "Invalid number of channels\n"); 1109 return AVERROR_INVALIDDATA; 1110 } 1111 1112 /* Initialize RNG. */ 1113 av_lfg_init(&q->random_state, 0); 1114 1115 while (edata_ptr < edata_ptr_end) { 1116 /* 8 for mono, 16 for stereo, ? for multichannel 1117 Swap to right endianness so we don't need to care later on. */ 1118 if (extradata_size >= 8) { 1119 q->subpacket[s].cookversion = bytestream_get_be32(&edata_ptr); 1120 q->subpacket[s].samples_per_frame = bytestream_get_be16(&edata_ptr); 1121 q->subpacket[s].subbands = bytestream_get_be16(&edata_ptr); 1122 extradata_size -= 8; 1123 } 1124 if (extradata_size >= 8) { 1125 bytestream_get_be32(&edata_ptr); // Unknown unused 1126 q->subpacket[s].js_subband_start = bytestream_get_be16(&edata_ptr); 1127 q->subpacket[s].js_vlc_bits = bytestream_get_be16(&edata_ptr); 1128 extradata_size -= 8; 1129 } 1130 1131 /* Initialize extradata related variables. */ 1132 q->subpacket[s].samples_per_channel = q->subpacket[s].samples_per_frame / q->nb_channels; 1133 q->subpacket[s].bits_per_subpacket = avctx->block_align * 8; 1134 1135 /* Initialize default data states. */ 1136 q->subpacket[s].log2_numvector_size = 5; 1137 q->subpacket[s].total_subbands = q->subpacket[s].subbands; 1138 q->subpacket[s].num_channels = 1; 1139 1140 /* Initialize version-dependent variables */ 1141 1142 av_log(avctx, AV_LOG_DEBUG, "subpacket[%i].cookversion=%x\n", s, 1143 q->subpacket[s].cookversion); 1144 q->subpacket[s].joint_stereo = 0; 1145 switch (q->subpacket[s].cookversion) { 1146 case MONO: 1147 if (q->nb_channels != 1) { 1148 av_log_ask_for_sample(avctx, "Container channels != 1.\n"); 1149 return AVERROR_PATCHWELCOME; 1150 } 1151 av_log(avctx, AV_LOG_DEBUG, "MONO\n"); 1152 break; 1153 case STEREO: 1154 if (q->nb_channels != 1) { 1155 q->subpacket[s].bits_per_subpdiv = 1; 1156 q->subpacket[s].num_channels = 2; 1157 } 1158 av_log(avctx, AV_LOG_DEBUG, "STEREO\n"); 1159 break; 1160 case JOINT_STEREO: 1161 if (q->nb_channels != 2) { 1162 av_log_ask_for_sample(avctx, "Container channels != 2.\n"); 1163 return AVERROR_PATCHWELCOME; 1164 } 1165 av_log(avctx, AV_LOG_DEBUG, "JOINT_STEREO\n"); 1166 if (avctx->extradata_size >= 16) { 1167 q->subpacket[s].total_subbands = q->subpacket[s].subbands + 1168 q->subpacket[s].js_subband_start; 1169 q->subpacket[s].joint_stereo = 1; 1170 q->subpacket[s].num_channels = 2; 1171 } 1172 if (q->subpacket[s].samples_per_channel > 256) { 1173 q->subpacket[s].log2_numvector_size = 6; 1174 } 1175 if (q->subpacket[s].samples_per_channel > 512) { 1176 q->subpacket[s].log2_numvector_size = 7; 1177 } 1178 break; 1179 case MC_COOK: 1180 av_log(avctx, AV_LOG_DEBUG, "MULTI_CHANNEL\n"); 1181 if (extradata_size >= 4) 1182 channel_mask |= q->subpacket[s].channel_mask = bytestream_get_be32(&edata_ptr); 1183 1184 if (cook_count_channels(q->subpacket[s].channel_mask) > 1) { 1185 q->subpacket[s].total_subbands = q->subpacket[s].subbands + 1186 q->subpacket[s].js_subband_start; 1187 q->subpacket[s].joint_stereo = 1; 1188 q->subpacket[s].num_channels = 2; 1189 q->subpacket[s].samples_per_channel = q->subpacket[s].samples_per_frame >> 1; 1190 1191 if (q->subpacket[s].samples_per_channel > 256) { 1192 q->subpacket[s].log2_numvector_size = 6; 1193 } 1194 if (q->subpacket[s].samples_per_channel > 512) { 1195 q->subpacket[s].log2_numvector_size = 7; 1196 } 1197 } else 1198 q->subpacket[s].samples_per_channel = q->subpacket[s].samples_per_frame; 1199 1200 break; 1201 default: 1202 av_log_ask_for_sample(avctx, "Unknown Cook version.\n"); 1203 return AVERROR_PATCHWELCOME; 1204 } 1205 1206 if (s > 1 && q->subpacket[s].samples_per_channel != q->samples_per_channel) { 1207 av_log(avctx, AV_LOG_ERROR, "different number of samples per channel!\n"); 1208 return AVERROR_INVALIDDATA; 1209 } else 1210 q->samples_per_channel = q->subpacket[0].samples_per_channel; 1211 1212 1213 /* Initialize variable relations */ 1214 q->subpacket[s].numvector_size = (1 << q->subpacket[s].log2_numvector_size); 1215 1216 /* Try to catch some obviously faulty streams, othervise it might be exploitable */ 1217 if (q->subpacket[s].total_subbands > 53) { 1218 av_log_ask_for_sample(avctx, "total_subbands > 53\n"); 1219 return AVERROR_PATCHWELCOME; 1220 } 1221 1222 if ((q->subpacket[s].js_vlc_bits > 6) || 1223 (q->subpacket[s].js_vlc_bits < 2 * q->subpacket[s].joint_stereo)) { 1224 av_log(avctx, AV_LOG_ERROR, "js_vlc_bits = %d, only >= %d and <= 6 allowed!\n", 1225 q->subpacket[s].js_vlc_bits, 2 * q->subpacket[s].joint_stereo); 1226 return AVERROR_INVALIDDATA; 1227 } 1228 1229 if (q->subpacket[s].subbands > 50) { 1230 av_log_ask_for_sample(avctx, "subbands > 50\n"); 1231 return AVERROR_PATCHWELCOME; 1232 } 1233 q->subpacket[s].gains1.now = q->subpacket[s].gain_1; 1234 q->subpacket[s].gains1.previous = q->subpacket[s].gain_2; 1235 q->subpacket[s].gains2.now = q->subpacket[s].gain_3; 1236 q->subpacket[s].gains2.previous = q->subpacket[s].gain_4; 1237 1238 q->num_subpackets++; 1239 s++; 1240 if (s > MAX_SUBPACKETS) { 1241 av_log_ask_for_sample(avctx, "Too many subpackets > 5\n"); 1242 return AVERROR_PATCHWELCOME; 1243 } 1244 } 1245 /* Generate tables */ 1246 init_pow2table(); 1247 init_gain_table(q); 1248 init_cplscales_table(q); 1249 1250 if ((ret = init_cook_vlc_tables(q))) 1251 return ret; 1252 1253 1254 if (avctx->block_align >= UINT_MAX / 2) 1255 return AVERROR(EINVAL); 1256 1257 /* Pad the databuffer with: 1258 DECODE_BYTES_PAD1 or DECODE_BYTES_PAD2 for decode_bytes(), 1259 FF_INPUT_BUFFER_PADDING_SIZE, for the bitstreamreader. */ 1260 q->decoded_bytes_buffer = 1261 av_mallocz(avctx->block_align 1262 + DECODE_BYTES_PAD1(avctx->block_align) 1263 + FF_INPUT_BUFFER_PADDING_SIZE); 1264 if (q->decoded_bytes_buffer == NULL) 1265 return AVERROR(ENOMEM); 1266 1267 /* Initialize transform. */ 1268 if ((ret = init_cook_mlt(q))) 1269 return ret; 1270 1271 /* Initialize COOK signal arithmetic handling */ 1272 if (1) { 1273 q->scalar_dequant = scalar_dequant_float; 1274 q->decouple = decouple_float; 1275 q->imlt_window = imlt_window_float; 1276 q->interpolate = interpolate_float; 1277 q->saturate_output = saturate_output_float; 1278 } 1279 1280 /* Try to catch some obviously faulty streams, othervise it might be exploitable */ 1281 if ((q->samples_per_channel == 256) || (q->samples_per_channel == 512) 1282 || (q->samples_per_channel == 1024)) { 1283 } else { 1284 av_log_ask_for_sample(avctx, 1285 "unknown amount of samples_per_channel = %d\n", 1286 q->samples_per_channel); 1287 return AVERROR_PATCHWELCOME; 1288 } 1289 1290 avctx->sample_fmt = AV_SAMPLE_FMT_FLT; 1291 if (channel_mask) 1292 avctx->channel_layout = channel_mask; 1293 else 1294 avctx->channel_layout = (avctx->channels == 2) ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO; 1295 1296 avcodec_get_frame_defaults(&q->frame); 1297 avctx->coded_frame = &q->frame; 1298 1299#ifdef DEBUG 1300 dump_cook_context(q); 1301#endif 1302 return 0; 1303} 1304 1305AVCodec ff_cook_decoder = { 1306 .name = "cook", 1307 .type = AVMEDIA_TYPE_AUDIO, 1308 .id = CODEC_ID_COOK, 1309 .priv_data_size = sizeof(COOKContext), 1310 .init = cook_decode_init, 1311 .close = cook_decode_close, 1312 .decode = cook_decode_frame, 1313 .capabilities = CODEC_CAP_DR1, 1314 .long_name = NULL_IF_CONFIG_SMALL("COOK"), 1315}; 1316