1/* 2 * TAK decoder 3 * Copyright (c) 2012 Paul B Mahol 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22/** 23 * @file 24 * TAK (Tom's lossless Audio Kompressor) decoder 25 * @author Paul B Mahol 26 */ 27 28#include "libavutil/internal.h" 29#include "libavutil/samplefmt.h" 30#include "tak.h" 31#include "audiodsp.h" 32#include "thread.h" 33#include "avcodec.h" 34#include "internal.h" 35#include "unary.h" 36 37#define MAX_SUBFRAMES 8 ///< max number of subframes per channel 38#define MAX_PREDICTORS 256 39 40typedef struct MCDParam { 41 int8_t present; ///< decorrelation parameter availability for this channel 42 int8_t index; ///< index into array of decorrelation types 43 int8_t chan1; 44 int8_t chan2; 45} MCDParam; 46 47typedef struct TAKDecContext { 48 AVCodecContext *avctx; ///< parent AVCodecContext 49 AudioDSPContext adsp; 50 TAKStreamInfo ti; 51 GetBitContext gb; ///< bitstream reader initialized to start at the current frame 52 53 int uval; 54 int nb_samples; ///< number of samples in the current frame 55 uint8_t *decode_buffer; 56 unsigned int decode_buffer_size; 57 int32_t *decoded[TAK_MAX_CHANNELS]; ///< decoded samples for each channel 58 59 int8_t lpc_mode[TAK_MAX_CHANNELS]; 60 int8_t sample_shift[TAK_MAX_CHANNELS]; ///< shift applied to every sample in the channel 61 int16_t predictors[MAX_PREDICTORS]; 62 int nb_subframes; ///< number of subframes in the current frame 63 int16_t subframe_len[MAX_SUBFRAMES]; ///< subframe length in samples 64 int subframe_scale; 65 66 int8_t dmode; ///< channel decorrelation type in the current frame 67 68 MCDParam mcdparams[TAK_MAX_CHANNELS]; ///< multichannel decorrelation parameters 69 70 int8_t coding_mode[128]; 71 DECLARE_ALIGNED(16, int16_t, filter)[MAX_PREDICTORS]; 72 DECLARE_ALIGNED(16, int16_t, residues)[544]; 73} TAKDecContext; 74 75static const int8_t mc_dmodes[] = { 1, 3, 4, 6, }; 76 77static const uint16_t predictor_sizes[] = { 78 4, 8, 12, 16, 24, 32, 48, 64, 80, 96, 128, 160, 192, 224, 256, 0, 79}; 80 81static const struct CParam { 82 int init; 83 int escape; 84 int scale; 85 int aescape; 86 int bias; 87} xcodes[50] = { 88 { 0x01, 0x0000001, 0x0000001, 0x0000003, 0x0000008 }, 89 { 0x02, 0x0000003, 0x0000001, 0x0000007, 0x0000006 }, 90 { 0x03, 0x0000005, 0x0000002, 0x000000E, 0x000000D }, 91 { 0x03, 0x0000003, 0x0000003, 0x000000D, 0x0000018 }, 92 { 0x04, 0x000000B, 0x0000004, 0x000001C, 0x0000019 }, 93 { 0x04, 0x0000006, 0x0000006, 0x000001A, 0x0000030 }, 94 { 0x05, 0x0000016, 0x0000008, 0x0000038, 0x0000032 }, 95 { 0x05, 0x000000C, 0x000000C, 0x0000034, 0x0000060 }, 96 { 0x06, 0x000002C, 0x0000010, 0x0000070, 0x0000064 }, 97 { 0x06, 0x0000018, 0x0000018, 0x0000068, 0x00000C0 }, 98 { 0x07, 0x0000058, 0x0000020, 0x00000E0, 0x00000C8 }, 99 { 0x07, 0x0000030, 0x0000030, 0x00000D0, 0x0000180 }, 100 { 0x08, 0x00000B0, 0x0000040, 0x00001C0, 0x0000190 }, 101 { 0x08, 0x0000060, 0x0000060, 0x00001A0, 0x0000300 }, 102 { 0x09, 0x0000160, 0x0000080, 0x0000380, 0x0000320 }, 103 { 0x09, 0x00000C0, 0x00000C0, 0x0000340, 0x0000600 }, 104 { 0x0A, 0x00002C0, 0x0000100, 0x0000700, 0x0000640 }, 105 { 0x0A, 0x0000180, 0x0000180, 0x0000680, 0x0000C00 }, 106 { 0x0B, 0x0000580, 0x0000200, 0x0000E00, 0x0000C80 }, 107 { 0x0B, 0x0000300, 0x0000300, 0x0000D00, 0x0001800 }, 108 { 0x0C, 0x0000B00, 0x0000400, 0x0001C00, 0x0001900 }, 109 { 0x0C, 0x0000600, 0x0000600, 0x0001A00, 0x0003000 }, 110 { 0x0D, 0x0001600, 0x0000800, 0x0003800, 0x0003200 }, 111 { 0x0D, 0x0000C00, 0x0000C00, 0x0003400, 0x0006000 }, 112 { 0x0E, 0x0002C00, 0x0001000, 0x0007000, 0x0006400 }, 113 { 0x0E, 0x0001800, 0x0001800, 0x0006800, 0x000C000 }, 114 { 0x0F, 0x0005800, 0x0002000, 0x000E000, 0x000C800 }, 115 { 0x0F, 0x0003000, 0x0003000, 0x000D000, 0x0018000 }, 116 { 0x10, 0x000B000, 0x0004000, 0x001C000, 0x0019000 }, 117 { 0x10, 0x0006000, 0x0006000, 0x001A000, 0x0030000 }, 118 { 0x11, 0x0016000, 0x0008000, 0x0038000, 0x0032000 }, 119 { 0x11, 0x000C000, 0x000C000, 0x0034000, 0x0060000 }, 120 { 0x12, 0x002C000, 0x0010000, 0x0070000, 0x0064000 }, 121 { 0x12, 0x0018000, 0x0018000, 0x0068000, 0x00C0000 }, 122 { 0x13, 0x0058000, 0x0020000, 0x00E0000, 0x00C8000 }, 123 { 0x13, 0x0030000, 0x0030000, 0x00D0000, 0x0180000 }, 124 { 0x14, 0x00B0000, 0x0040000, 0x01C0000, 0x0190000 }, 125 { 0x14, 0x0060000, 0x0060000, 0x01A0000, 0x0300000 }, 126 { 0x15, 0x0160000, 0x0080000, 0x0380000, 0x0320000 }, 127 { 0x15, 0x00C0000, 0x00C0000, 0x0340000, 0x0600000 }, 128 { 0x16, 0x02C0000, 0x0100000, 0x0700000, 0x0640000 }, 129 { 0x16, 0x0180000, 0x0180000, 0x0680000, 0x0C00000 }, 130 { 0x17, 0x0580000, 0x0200000, 0x0E00000, 0x0C80000 }, 131 { 0x17, 0x0300000, 0x0300000, 0x0D00000, 0x1800000 }, 132 { 0x18, 0x0B00000, 0x0400000, 0x1C00000, 0x1900000 }, 133 { 0x18, 0x0600000, 0x0600000, 0x1A00000, 0x3000000 }, 134 { 0x19, 0x1600000, 0x0800000, 0x3800000, 0x3200000 }, 135 { 0x19, 0x0C00000, 0x0C00000, 0x3400000, 0x6000000 }, 136 { 0x1A, 0x2C00000, 0x1000000, 0x7000000, 0x6400000 }, 137 { 0x1A, 0x1800000, 0x1800000, 0x6800000, 0xC000000 }, 138}; 139 140static int set_bps_params(AVCodecContext *avctx) 141{ 142 switch (avctx->bits_per_raw_sample) { 143 case 8: 144 avctx->sample_fmt = AV_SAMPLE_FMT_U8P; 145 break; 146 case 16: 147 avctx->sample_fmt = AV_SAMPLE_FMT_S16P; 148 break; 149 case 24: 150 avctx->sample_fmt = AV_SAMPLE_FMT_S32P; 151 break; 152 default: 153 av_log(avctx, AV_LOG_ERROR, "invalid/unsupported bits per sample: %d\n", 154 avctx->bits_per_raw_sample); 155 return AVERROR_INVALIDDATA; 156 } 157 158 return 0; 159} 160 161static void set_sample_rate_params(AVCodecContext *avctx) 162{ 163 TAKDecContext *s = avctx->priv_data; 164 int shift = 3 - (avctx->sample_rate / 11025); 165 shift = FFMAX(0, shift); 166 s->uval = FFALIGN(avctx->sample_rate + 511 >> 9, 4) << shift; 167 s->subframe_scale = FFALIGN(avctx->sample_rate + 511 >> 9, 4) << 1; 168} 169 170static av_cold int tak_decode_init(AVCodecContext *avctx) 171{ 172 TAKDecContext *s = avctx->priv_data; 173 174 ff_audiodsp_init(&s->adsp); 175 176 s->avctx = avctx; 177 avctx->bits_per_raw_sample = avctx->bits_per_coded_sample; 178 179 set_sample_rate_params(avctx); 180 181 return set_bps_params(avctx); 182} 183 184static void decode_lpc(int32_t *coeffs, int mode, int length) 185{ 186 int i; 187 188 if (length < 2) 189 return; 190 191 if (mode == 1) { 192 int a1 = *coeffs++; 193 for (i = 0; i < length - 1 >> 1; i++) { 194 *coeffs += a1; 195 coeffs[1] += *coeffs; 196 a1 = coeffs[1]; 197 coeffs += 2; 198 } 199 if (length - 1 & 1) 200 *coeffs += a1; 201 } else if (mode == 2) { 202 int a1 = coeffs[1]; 203 int a2 = a1 + *coeffs; 204 coeffs[1] = a2; 205 if (length > 2) { 206 coeffs += 2; 207 for (i = 0; i < length - 2 >> 1; i++) { 208 int a3 = *coeffs + a1; 209 int a4 = a3 + a2; 210 *coeffs = a4; 211 a1 = coeffs[1] + a3; 212 a2 = a1 + a4; 213 coeffs[1] = a2; 214 coeffs += 2; 215 } 216 if (length & 1) 217 *coeffs += a1 + a2; 218 } 219 } else if (mode == 3) { 220 int a1 = coeffs[1]; 221 int a2 = a1 + *coeffs; 222 coeffs[1] = a2; 223 if (length > 2) { 224 int a3 = coeffs[2]; 225 int a4 = a3 + a1; 226 int a5 = a4 + a2; 227 coeffs += 3; 228 for (i = 0; i < length - 3; i++) { 229 a3 += *coeffs; 230 a4 += a3; 231 a5 += a4; 232 *coeffs = a5; 233 coeffs++; 234 } 235 } 236 } 237} 238 239static int decode_segment(TAKDecContext *s, int8_t mode, int32_t *decoded, int len) 240{ 241 struct CParam code; 242 GetBitContext *gb = &s->gb; 243 int i; 244 245 if (!mode) { 246 memset(decoded, 0, len * sizeof(*decoded)); 247 return 0; 248 } 249 250 if (mode > FF_ARRAY_ELEMS(xcodes)) 251 return AVERROR_INVALIDDATA; 252 code = xcodes[mode - 1]; 253 254 for (i = 0; i < len; i++) { 255 int x = get_bits_long(gb, code.init); 256 if (x >= code.escape && get_bits1(gb)) { 257 x |= 1 << code.init; 258 if (x >= code.aescape) { 259 int scale = get_unary(gb, 1, 9); 260 if (scale == 9) { 261 int scale_bits = get_bits(gb, 3); 262 if (scale_bits > 0) { 263 if (scale_bits == 7) { 264 scale_bits += get_bits(gb, 5); 265 if (scale_bits > 29) 266 return AVERROR_INVALIDDATA; 267 } 268 scale = get_bits_long(gb, scale_bits) + 1; 269 x += code.scale * scale; 270 } 271 x += code.bias; 272 } else 273 x += code.scale * scale - code.escape; 274 } else 275 x -= code.escape; 276 } 277 decoded[i] = (x >> 1) ^ -(x & 1); 278 } 279 280 return 0; 281} 282 283static int decode_residues(TAKDecContext *s, int32_t *decoded, int length) 284{ 285 GetBitContext *gb = &s->gb; 286 int i, mode, ret; 287 288 if (length > s->nb_samples) 289 return AVERROR_INVALIDDATA; 290 291 if (get_bits1(gb)) { 292 int wlength, rval; 293 294 wlength = length / s->uval; 295 296 rval = length - (wlength * s->uval); 297 298 if (rval < s->uval / 2) 299 rval += s->uval; 300 else 301 wlength++; 302 303 if (wlength <= 1 || wlength > 128) 304 return AVERROR_INVALIDDATA; 305 306 s->coding_mode[0] = mode = get_bits(gb, 6); 307 308 for (i = 1; i < wlength; i++) { 309 int c = get_unary(gb, 1, 6); 310 311 switch (c) { 312 case 6: 313 mode = get_bits(gb, 6); 314 break; 315 case 5: 316 case 4: 317 case 3: { 318 /* mode += sign ? (1 - c) : (c - 1) */ 319 int sign = get_bits1(gb); 320 mode += (-sign ^ (c - 1)) + sign; 321 break; 322 } 323 case 2: 324 mode++; 325 break; 326 case 1: 327 mode--; 328 break; 329 } 330 s->coding_mode[i] = mode; 331 } 332 333 i = 0; 334 while (i < wlength) { 335 int len = 0; 336 337 mode = s->coding_mode[i]; 338 do { 339 if (i >= wlength - 1) 340 len += rval; 341 else 342 len += s->uval; 343 i++; 344 345 if (i == wlength) 346 break; 347 } while (s->coding_mode[i] == mode); 348 349 if ((ret = decode_segment(s, mode, decoded, len)) < 0) 350 return ret; 351 decoded += len; 352 } 353 } else { 354 mode = get_bits(gb, 6); 355 if ((ret = decode_segment(s, mode, decoded, length)) < 0) 356 return ret; 357 } 358 359 return 0; 360} 361 362static int get_bits_esc4(GetBitContext *gb) 363{ 364 if (get_bits1(gb)) 365 return get_bits(gb, 4) + 1; 366 else 367 return 0; 368} 369 370static int decode_subframe(TAKDecContext *s, int32_t *decoded, 371 int subframe_size, int prev_subframe_size) 372{ 373 GetBitContext *gb = &s->gb; 374 int tmp, x, y, i, j, ret = 0; 375 int dshift, size, filter_quant, filter_order; 376 int tfilter[MAX_PREDICTORS]; 377 378 if (!get_bits1(gb)) 379 return decode_residues(s, decoded, subframe_size); 380 381 filter_order = predictor_sizes[get_bits(gb, 4)]; 382 383 if (prev_subframe_size > 0 && get_bits1(gb)) { 384 if (filter_order > prev_subframe_size) 385 return AVERROR_INVALIDDATA; 386 387 decoded -= filter_order; 388 subframe_size += filter_order; 389 390 if (filter_order > subframe_size) 391 return AVERROR_INVALIDDATA; 392 } else { 393 int lpc_mode; 394 395 if (filter_order > subframe_size) 396 return AVERROR_INVALIDDATA; 397 398 lpc_mode = get_bits(gb, 2); 399 if (lpc_mode > 2) 400 return AVERROR_INVALIDDATA; 401 402 if ((ret = decode_residues(s, decoded, filter_order)) < 0) 403 return ret; 404 405 if (lpc_mode) 406 decode_lpc(decoded, lpc_mode, filter_order); 407 } 408 409 dshift = get_bits_esc4(gb); 410 size = get_bits1(gb) + 6; 411 412 filter_quant = 10; 413 if (get_bits1(gb)) { 414 filter_quant -= get_bits(gb, 3) + 1; 415 if (filter_quant < 3) 416 return AVERROR_INVALIDDATA; 417 } 418 419 s->predictors[0] = get_sbits(gb, 10); 420 s->predictors[1] = get_sbits(gb, 10); 421 s->predictors[2] = get_sbits(gb, size) << (10 - size); 422 s->predictors[3] = get_sbits(gb, size) << (10 - size); 423 if (filter_order > 4) { 424 tmp = size - get_bits1(gb); 425 426 for (i = 4; i < filter_order; i++) { 427 if (!(i & 3)) 428 x = tmp - get_bits(gb, 2); 429 s->predictors[i] = get_sbits(gb, x) << (10 - size); 430 } 431 } 432 433 tfilter[0] = s->predictors[0] << 6; 434 for (i = 1; i < filter_order; i++) { 435 int32_t *p1 = &tfilter[0]; 436 int32_t *p2 = &tfilter[i - 1]; 437 438 for (j = 0; j < (i + 1) / 2; j++) { 439 x = *p1 + (s->predictors[i] * *p2 + 256 >> 9); 440 *p2 += s->predictors[i] * *p1 + 256 >> 9; 441 *p1++ = x; 442 p2--; 443 } 444 445 tfilter[i] = s->predictors[i] << 6; 446 } 447 448 x = 1 << (32 - (15 - filter_quant)); 449 y = 1 << ((15 - filter_quant) - 1); 450 for (i = 0, j = filter_order - 1; i < filter_order / 2; i++, j--) { 451 tmp = y + tfilter[j]; 452 s->filter[j] = x - ((tfilter[i] + y) >> (15 - filter_quant)); 453 s->filter[i] = x - ((tfilter[j] + y) >> (15 - filter_quant)); 454 } 455 456 if ((ret = decode_residues(s, &decoded[filter_order], 457 subframe_size - filter_order)) < 0) 458 return ret; 459 460 for (i = 0; i < filter_order; i++) 461 s->residues[i] = *decoded++ >> dshift; 462 463 y = FF_ARRAY_ELEMS(s->residues) - filter_order; 464 x = subframe_size - filter_order; 465 while (x > 0) { 466 tmp = FFMIN(y, x); 467 468 for (i = 0; i < tmp; i++) { 469 int v = 1 << (filter_quant - 1); 470 471 if (filter_order & -16) 472 v += s->adsp.scalarproduct_int16(&s->residues[i], s->filter, 473 filter_order & -16); 474 for (j = filter_order & -16; j < filter_order; j += 4) { 475 v += s->residues[i + j + 3] * s->filter[j + 3] + 476 s->residues[i + j + 2] * s->filter[j + 2] + 477 s->residues[i + j + 1] * s->filter[j + 1] + 478 s->residues[i + j ] * s->filter[j ]; 479 } 480 v = (av_clip(v >> filter_quant, -8192, 8191) << dshift) - *decoded; 481 *decoded++ = v; 482 s->residues[filter_order + i] = v >> dshift; 483 } 484 485 x -= tmp; 486 if (x > 0) 487 memcpy(s->residues, &s->residues[y], 2 * filter_order); 488 } 489 490 emms_c(); 491 492 return 0; 493} 494 495static int decode_channel(TAKDecContext *s, int chan) 496{ 497 AVCodecContext *avctx = s->avctx; 498 GetBitContext *gb = &s->gb; 499 int32_t *decoded = s->decoded[chan]; 500 int left = s->nb_samples - 1; 501 int i = 0, ret, prev = 0; 502 503 s->sample_shift[chan] = get_bits_esc4(gb); 504 if (s->sample_shift[chan] >= avctx->bits_per_raw_sample) 505 return AVERROR_INVALIDDATA; 506 507 *decoded++ = get_sbits(gb, avctx->bits_per_raw_sample - s->sample_shift[chan]); 508 s->lpc_mode[chan] = get_bits(gb, 2); 509 s->nb_subframes = get_bits(gb, 3) + 1; 510 511 if (s->nb_subframes > 1) { 512 if (get_bits_left(gb) < (s->nb_subframes - 1) * 6) 513 return AVERROR_INVALIDDATA; 514 515 for (; i < s->nb_subframes - 1; i++) { 516 int v = get_bits(gb, 6); 517 518 s->subframe_len[i] = (v - prev) * s->subframe_scale; 519 if (s->subframe_len[i] <= 0) 520 return AVERROR_INVALIDDATA; 521 522 left -= s->subframe_len[i]; 523 prev = v; 524 } 525 526 if (left <= 0) 527 return AVERROR_INVALIDDATA; 528 } 529 s->subframe_len[i] = left; 530 531 prev = 0; 532 for (i = 0; i < s->nb_subframes; i++) { 533 if ((ret = decode_subframe(s, decoded, s->subframe_len[i], prev)) < 0) 534 return ret; 535 decoded += s->subframe_len[i]; 536 prev = s->subframe_len[i]; 537 } 538 539 return 0; 540} 541 542static int decorrelate(TAKDecContext *s, int c1, int c2, int length) 543{ 544 GetBitContext *gb = &s->gb; 545 int32_t *p1 = s->decoded[c1] + 1; 546 int32_t *p2 = s->decoded[c2] + 1; 547 int i; 548 int dshift, dfactor; 549 550 switch (s->dmode) { 551 case 1: /* left/side */ 552 for (i = 0; i < length; i++) { 553 int32_t a = p1[i]; 554 int32_t b = p2[i]; 555 p2[i] = a + b; 556 } 557 break; 558 case 2: /* side/right */ 559 for (i = 0; i < length; i++) { 560 int32_t a = p1[i]; 561 int32_t b = p2[i]; 562 p1[i] = b - a; 563 } 564 break; 565 case 3: /* side/mid */ 566 for (i = 0; i < length; i++) { 567 int32_t a = p1[i]; 568 int32_t b = p2[i]; 569 a -= b >> 1; 570 p1[i] = a; 571 p2[i] = a + b; 572 } 573 break; 574 case 4: /* side/left with scale factor */ 575 FFSWAP(int32_t*, p1, p2); 576 case 5: /* side/right with scale factor */ 577 dshift = get_bits_esc4(gb); 578 dfactor = get_sbits(gb, 10); 579 for (i = 0; i < length; i++) { 580 int32_t a = p1[i]; 581 int32_t b = p2[i]; 582 b = dfactor * (b >> dshift) + 128 >> 8 << dshift; 583 p1[i] = b - a; 584 } 585 break; 586 case 6: 587 FFSWAP(int32_t*, p1, p2); 588 case 7: { 589 int length2, order_half, filter_order, dval1, dval2; 590 int tmp, x, code_size; 591 592 if (length < 256) 593 return AVERROR_INVALIDDATA; 594 595 dshift = get_bits_esc4(gb); 596 filter_order = 8 << get_bits1(gb); 597 dval1 = get_bits1(gb); 598 dval2 = get_bits1(gb); 599 600 for (i = 0; i < filter_order; i++) { 601 if (!(i & 3)) 602 code_size = 14 - get_bits(gb, 3); 603 s->filter[i] = get_sbits(gb, code_size); 604 } 605 606 order_half = filter_order / 2; 607 length2 = length - (filter_order - 1); 608 609 /* decorrelate beginning samples */ 610 if (dval1) { 611 for (i = 0; i < order_half; i++) { 612 int32_t a = p1[i]; 613 int32_t b = p2[i]; 614 p1[i] = a + b; 615 } 616 } 617 618 /* decorrelate ending samples */ 619 if (dval2) { 620 for (i = length2 + order_half; i < length; i++) { 621 int32_t a = p1[i]; 622 int32_t b = p2[i]; 623 p1[i] = a + b; 624 } 625 } 626 627 628 for (i = 0; i < filter_order; i++) 629 s->residues[i] = *p2++ >> dshift; 630 631 p1 += order_half; 632 x = FF_ARRAY_ELEMS(s->residues) - filter_order; 633 for (; length2 > 0; length2 -= tmp) { 634 tmp = FFMIN(length2, x); 635 636 for (i = 0; i < tmp; i++) 637 s->residues[filter_order + i] = *p2++ >> dshift; 638 639 for (i = 0; i < tmp; i++) { 640 int v = 1 << 9; 641 642 if (filter_order == 16) { 643 v += s->adsp.scalarproduct_int16(&s->residues[i], s->filter, 644 filter_order); 645 } else { 646 v += s->residues[i + 7] * s->filter[7] + 647 s->residues[i + 6] * s->filter[6] + 648 s->residues[i + 5] * s->filter[5] + 649 s->residues[i + 4] * s->filter[4] + 650 s->residues[i + 3] * s->filter[3] + 651 s->residues[i + 2] * s->filter[2] + 652 s->residues[i + 1] * s->filter[1] + 653 s->residues[i ] * s->filter[0]; 654 } 655 656 v = (av_clip(v >> 10, -8192, 8191) << dshift) - *p1; 657 *p1++ = v; 658 } 659 660 memcpy(s->residues, &s->residues[tmp], 2 * filter_order); 661 } 662 663 emms_c(); 664 break; 665 } 666 } 667 668 return 0; 669} 670 671static int tak_decode_frame(AVCodecContext *avctx, void *data, 672 int *got_frame_ptr, AVPacket *pkt) 673{ 674 TAKDecContext *s = avctx->priv_data; 675 AVFrame *frame = data; 676 ThreadFrame tframe = { .f = data }; 677 GetBitContext *gb = &s->gb; 678 int chan, i, ret, hsize; 679 680 if (pkt->size < TAK_MIN_FRAME_HEADER_BYTES) 681 return AVERROR_INVALIDDATA; 682 683 if ((ret = init_get_bits8(gb, pkt->data, pkt->size)) < 0) 684 return ret; 685 686 if ((ret = ff_tak_decode_frame_header(avctx, gb, &s->ti, 0)) < 0) 687 return ret; 688 689 hsize = get_bits_count(gb) / 8; 690 if (avctx->err_recognition & (AV_EF_CRCCHECK|AV_EF_COMPLIANT)) { 691 if (ff_tak_check_crc(pkt->data, hsize)) { 692 av_log(avctx, AV_LOG_ERROR, "CRC error\n"); 693 if (avctx->err_recognition & AV_EF_EXPLODE) 694 return AVERROR_INVALIDDATA; 695 } 696 } 697 698 if (s->ti.codec != TAK_CODEC_MONO_STEREO && 699 s->ti.codec != TAK_CODEC_MULTICHANNEL) { 700 av_log(avctx, AV_LOG_ERROR, "unsupported codec: %d\n", s->ti.codec); 701 return AVERROR_PATCHWELCOME; 702 } 703 if (s->ti.data_type) { 704 av_log(avctx, AV_LOG_ERROR, 705 "unsupported data type: %d\n", s->ti.data_type); 706 return AVERROR_INVALIDDATA; 707 } 708 if (s->ti.codec == TAK_CODEC_MONO_STEREO && s->ti.channels > 2) { 709 av_log(avctx, AV_LOG_ERROR, 710 "invalid number of channels: %d\n", s->ti.channels); 711 return AVERROR_INVALIDDATA; 712 } 713 if (s->ti.channels > 6) { 714 av_log(avctx, AV_LOG_ERROR, 715 "unsupported number of channels: %d\n", s->ti.channels); 716 return AVERROR_INVALIDDATA; 717 } 718 719 if (s->ti.frame_samples <= 0) { 720 av_log(avctx, AV_LOG_ERROR, "unsupported/invalid number of samples\n"); 721 return AVERROR_INVALIDDATA; 722 } 723 724 avctx->bits_per_raw_sample = s->ti.bps; 725 if ((ret = set_bps_params(avctx)) < 0) 726 return ret; 727 if (s->ti.sample_rate != avctx->sample_rate) { 728 avctx->sample_rate = s->ti.sample_rate; 729 set_sample_rate_params(avctx); 730 } 731 if (s->ti.ch_layout) 732 avctx->channel_layout = s->ti.ch_layout; 733 avctx->channels = s->ti.channels; 734 735 s->nb_samples = s->ti.last_frame_samples ? s->ti.last_frame_samples 736 : s->ti.frame_samples; 737 738 frame->nb_samples = s->nb_samples; 739 if ((ret = ff_thread_get_buffer(avctx, &tframe, 0)) < 0) 740 return ret; 741 ff_thread_finish_setup(avctx); 742 743 if (avctx->bits_per_raw_sample <= 16) { 744 int buf_size = av_samples_get_buffer_size(NULL, avctx->channels, 745 s->nb_samples, 746 AV_SAMPLE_FMT_S32P, 0); 747 av_fast_malloc(&s->decode_buffer, &s->decode_buffer_size, buf_size); 748 if (!s->decode_buffer) 749 return AVERROR(ENOMEM); 750 ret = av_samples_fill_arrays((uint8_t **)s->decoded, NULL, 751 s->decode_buffer, avctx->channels, 752 s->nb_samples, AV_SAMPLE_FMT_S32P, 0); 753 if (ret < 0) 754 return ret; 755 } else { 756 for (chan = 0; chan < avctx->channels; chan++) 757 s->decoded[chan] = (int32_t *)frame->extended_data[chan]; 758 } 759 760 if (s->nb_samples < 16) { 761 for (chan = 0; chan < avctx->channels; chan++) { 762 int32_t *decoded = s->decoded[chan]; 763 for (i = 0; i < s->nb_samples; i++) 764 decoded[i] = get_sbits(gb, avctx->bits_per_raw_sample); 765 } 766 } else { 767 if (s->ti.codec == TAK_CODEC_MONO_STEREO) { 768 for (chan = 0; chan < avctx->channels; chan++) 769 if (ret = decode_channel(s, chan)) 770 return ret; 771 772 if (avctx->channels == 2) { 773 s->nb_subframes = get_bits(gb, 1) + 1; 774 if (s->nb_subframes > 1) { 775 s->subframe_len[1] = get_bits(gb, 6); 776 } 777 778 s->dmode = get_bits(gb, 3); 779 if (ret = decorrelate(s, 0, 1, s->nb_samples - 1)) 780 return ret; 781 } 782 } else if (s->ti.codec == TAK_CODEC_MULTICHANNEL) { 783 if (get_bits1(gb)) { 784 int ch_mask = 0; 785 786 chan = get_bits(gb, 4) + 1; 787 if (chan > avctx->channels) 788 return AVERROR_INVALIDDATA; 789 790 for (i = 0; i < chan; i++) { 791 int nbit = get_bits(gb, 4); 792 793 if (nbit >= avctx->channels) 794 return AVERROR_INVALIDDATA; 795 796 if (ch_mask & 1 << nbit) 797 return AVERROR_INVALIDDATA; 798 799 s->mcdparams[i].present = get_bits1(gb); 800 if (s->mcdparams[i].present) { 801 s->mcdparams[i].index = get_bits(gb, 2); 802 s->mcdparams[i].chan2 = get_bits(gb, 4); 803 if (s->mcdparams[i].index == 1) { 804 if ((nbit == s->mcdparams[i].chan2) || 805 (ch_mask & 1 << s->mcdparams[i].chan2)) 806 return AVERROR_INVALIDDATA; 807 808 ch_mask |= 1 << s->mcdparams[i].chan2; 809 } else if (!(ch_mask & 1 << s->mcdparams[i].chan2)) { 810 return AVERROR_INVALIDDATA; 811 } 812 } 813 s->mcdparams[i].chan1 = nbit; 814 815 ch_mask |= 1 << nbit; 816 } 817 } else { 818 chan = avctx->channels; 819 for (i = 0; i < chan; i++) { 820 s->mcdparams[i].present = 0; 821 s->mcdparams[i].chan1 = i; 822 } 823 } 824 825 for (i = 0; i < chan; i++) { 826 if (s->mcdparams[i].present && s->mcdparams[i].index == 1) 827 if (ret = decode_channel(s, s->mcdparams[i].chan2)) 828 return ret; 829 830 if (ret = decode_channel(s, s->mcdparams[i].chan1)) 831 return ret; 832 833 if (s->mcdparams[i].present) { 834 s->dmode = mc_dmodes[s->mcdparams[i].index]; 835 if (ret = decorrelate(s, 836 s->mcdparams[i].chan2, 837 s->mcdparams[i].chan1, 838 s->nb_samples - 1)) 839 return ret; 840 } 841 } 842 } 843 844 for (chan = 0; chan < avctx->channels; chan++) { 845 int32_t *decoded = s->decoded[chan]; 846 847 if (s->lpc_mode[chan]) 848 decode_lpc(decoded, s->lpc_mode[chan], s->nb_samples); 849 850 if (s->sample_shift[chan] > 0) 851 for (i = 0; i < s->nb_samples; i++) 852 decoded[i] <<= s->sample_shift[chan]; 853 } 854 } 855 856 align_get_bits(gb); 857 skip_bits(gb, 24); 858 if (get_bits_left(gb) < 0) 859 av_log(avctx, AV_LOG_DEBUG, "overread\n"); 860 else if (get_bits_left(gb) > 0) 861 av_log(avctx, AV_LOG_DEBUG, "underread\n"); 862 863 if (avctx->err_recognition & (AV_EF_CRCCHECK | AV_EF_COMPLIANT)) { 864 if (ff_tak_check_crc(pkt->data + hsize, 865 get_bits_count(gb) / 8 - hsize)) { 866 av_log(avctx, AV_LOG_ERROR, "CRC error\n"); 867 if (avctx->err_recognition & AV_EF_EXPLODE) 868 return AVERROR_INVALIDDATA; 869 } 870 } 871 872 /* convert to output buffer */ 873 switch (avctx->sample_fmt) { 874 case AV_SAMPLE_FMT_U8P: 875 for (chan = 0; chan < avctx->channels; chan++) { 876 uint8_t *samples = (uint8_t *)frame->extended_data[chan]; 877 int32_t *decoded = s->decoded[chan]; 878 for (i = 0; i < s->nb_samples; i++) 879 samples[i] = decoded[i] + 0x80; 880 } 881 break; 882 case AV_SAMPLE_FMT_S16P: 883 for (chan = 0; chan < avctx->channels; chan++) { 884 int16_t *samples = (int16_t *)frame->extended_data[chan]; 885 int32_t *decoded = s->decoded[chan]; 886 for (i = 0; i < s->nb_samples; i++) 887 samples[i] = decoded[i]; 888 } 889 break; 890 case AV_SAMPLE_FMT_S32P: 891 for (chan = 0; chan < avctx->channels; chan++) { 892 int32_t *samples = (int32_t *)frame->extended_data[chan]; 893 for (i = 0; i < s->nb_samples; i++) 894 samples[i] <<= 8; 895 } 896 break; 897 } 898 899 *got_frame_ptr = 1; 900 901 return pkt->size; 902} 903 904static int init_thread_copy(AVCodecContext *avctx) 905{ 906 TAKDecContext *s = avctx->priv_data; 907 s->avctx = avctx; 908 return 0; 909} 910 911static int update_thread_context(AVCodecContext *dst, 912 const AVCodecContext *src) 913{ 914 TAKDecContext *tsrc = src->priv_data; 915 TAKDecContext *tdst = dst->priv_data; 916 917 if (dst == src) 918 return 0; 919 memcpy(&tdst->ti, &tsrc->ti, sizeof(TAKStreamInfo)); 920 return 0; 921} 922 923static av_cold int tak_decode_close(AVCodecContext *avctx) 924{ 925 TAKDecContext *s = avctx->priv_data; 926 927 av_freep(&s->decode_buffer); 928 929 return 0; 930} 931 932AVCodec ff_tak_decoder = { 933 .name = "tak", 934 .long_name = NULL_IF_CONFIG_SMALL("TAK (Tom's lossless Audio Kompressor)"), 935 .type = AVMEDIA_TYPE_AUDIO, 936 .id = AV_CODEC_ID_TAK, 937 .priv_data_size = sizeof(TAKDecContext), 938 .init = tak_decode_init, 939 .close = tak_decode_close, 940 .decode = tak_decode_frame, 941 .init_thread_copy = ONLY_IF_THREADS_ENABLED(init_thread_copy), 942 .update_thread_context = ONLY_IF_THREADS_ENABLED(update_thread_context), 943 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS, 944 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_U8P, 945 AV_SAMPLE_FMT_S16P, 946 AV_SAMPLE_FMT_S32P, 947 AV_SAMPLE_FMT_NONE }, 948}; 949