libavcodec/takdec.c

   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/mem.h"
  30 #include "libavutil/mem_internal.h"
  31 #include "libavutil/samplefmt.h"
  32
  33 #define CACHED_BITSTREAM_READER !ARCH_X86_32
  34 #define BITSTREAM_READER_LE
  35 #include "audiodsp.h"
  36 #include "thread.h"
  37 #include "avcodec.h"
  38 #include "codec_internal.h"
  39 #include "unary.h"
  40 #include "tak.h"
  41 #include "takdsp.h"
  42
  43 #define MAX_SUBFRAMES     8                         ///< max number of subframes per channel
  44 #define MAX_PREDICTORS  256
  45
  46 typedef struct MCDParam {
  47     int8_t present;                                 ///< decorrelation parameter availability for this channel
  48     int8_t index;                                   ///< index into array of decorrelation types
  49     int8_t chan1;
  50     int8_t chan2;
  51 } MCDParam;
  52
  53 typedef struct TAKDecContext {
  54     AVCodecContext *avctx;                          ///< parent AVCodecContext
  55     AudioDSPContext adsp;
  56     TAKDSPContext   tdsp;
  57     TAKStreamInfo   ti;
  58     GetBitContext   gb;                             ///< bitstream reader initialized to start at the current frame
  59
  60     int             uval;
  61     int             nb_samples;                     ///< number of samples in the current frame
  62     uint8_t        *decode_buffer;
  63     unsigned int    decode_buffer_size;
  64     int32_t        *decoded[TAK_MAX_CHANNELS];      ///< decoded samples for each channel
  65
  66     int8_t          lpc_mode[TAK_MAX_CHANNELS];
  67     int8_t          sample_shift[TAK_MAX_CHANNELS]; ///< shift applied to every sample in the channel
  68     int16_t         predictors[MAX_PREDICTORS];
  69     int             nb_subframes;                   ///< number of subframes in the current frame
  70     int16_t         subframe_len[MAX_SUBFRAMES];    ///< subframe length in samples
  71     int             subframe_scale;
  72
  73     int8_t          dmode;                          ///< channel decorrelation type in the current frame
  74
  75     MCDParam        mcdparams[TAK_MAX_CHANNELS];    ///< multichannel decorrelation parameters
  76
  77     int8_t          coding_mode[128];
  78     DECLARE_ALIGNED(16, int16_t, filter)[MAX_PREDICTORS];
  79     DECLARE_ALIGNED(16, int16_t, residues)[544];
  80 } TAKDecContext;
  81
  82 static const int8_t mc_dmodes[] = { 1, 3, 4, 6, };
  83
  84 static const uint16_t predictor_sizes[] = {
  85     4, 8, 12, 16, 24, 32, 48, 64, 80, 96, 128, 160, 192, 224, 256, 0,
  86 };
  87
  88 static const struct CParam {
  89     int init;
  90     int escape;
  91     int scale;
  92     int aescape;
  93     int bias;
  94 } xcodes[50] = {
  95     { 0x01, 0x0000001, 0x0000001, 0x0000003, 0x0000008 },
  96     { 0x02, 0x0000003, 0x0000001, 0x0000007, 0x0000006 },
  97     { 0x03, 0x0000005, 0x0000002, 0x000000E, 0x000000D },
  98     { 0x03, 0x0000003, 0x0000003, 0x000000D, 0x0000018 },
  99     { 0x04, 0x000000B, 0x0000004, 0x000001C, 0x0000019 },
 100     { 0x04, 0x0000006, 0x0000006, 0x000001A, 0x0000030 },
 101     { 0x05, 0x0000016, 0x0000008, 0x0000038, 0x0000032 },
 102     { 0x05, 0x000000C, 0x000000C, 0x0000034, 0x0000060 },
 103     { 0x06, 0x000002C, 0x0000010, 0x0000070, 0x0000064 },
 104     { 0x06, 0x0000018, 0x0000018, 0x0000068, 0x00000C0 },
 105     { 0x07, 0x0000058, 0x0000020, 0x00000E0, 0x00000C8 },
 106     { 0x07, 0x0000030, 0x0000030, 0x00000D0, 0x0000180 },
 107     { 0x08, 0x00000B0, 0x0000040, 0x00001C0, 0x0000190 },
 108     { 0x08, 0x0000060, 0x0000060, 0x00001A0, 0x0000300 },
 109     { 0x09, 0x0000160, 0x0000080, 0x0000380, 0x0000320 },
 110     { 0x09, 0x00000C0, 0x00000C0, 0x0000340, 0x0000600 },
 111     { 0x0A, 0x00002C0, 0x0000100, 0x0000700, 0x0000640 },
 112     { 0x0A, 0x0000180, 0x0000180, 0x0000680, 0x0000C00 },
 113     { 0x0B, 0x0000580, 0x0000200, 0x0000E00, 0x0000C80 },
 114     { 0x0B, 0x0000300, 0x0000300, 0x0000D00, 0x0001800 },
 115     { 0x0C, 0x0000B00, 0x0000400, 0x0001C00, 0x0001900 },
 116     { 0x0C, 0x0000600, 0x0000600, 0x0001A00, 0x0003000 },
 117     { 0x0D, 0x0001600, 0x0000800, 0x0003800, 0x0003200 },
 118     { 0x0D, 0x0000C00, 0x0000C00, 0x0003400, 0x0006000 },
 119     { 0x0E, 0x0002C00, 0x0001000, 0x0007000, 0x0006400 },
 120     { 0x0E, 0x0001800, 0x0001800, 0x0006800, 0x000C000 },
 121     { 0x0F, 0x0005800, 0x0002000, 0x000E000, 0x000C800 },
 122     { 0x0F, 0x0003000, 0x0003000, 0x000D000, 0x0018000 },
 123     { 0x10, 0x000B000, 0x0004000, 0x001C000, 0x0019000 },
 124     { 0x10, 0x0006000, 0x0006000, 0x001A000, 0x0030000 },
 125     { 0x11, 0x0016000, 0x0008000, 0x0038000, 0x0032000 },
 126     { 0x11, 0x000C000, 0x000C000, 0x0034000, 0x0060000 },
 127     { 0x12, 0x002C000, 0x0010000, 0x0070000, 0x0064000 },
 128     { 0x12, 0x0018000, 0x0018000, 0x0068000, 0x00C0000 },
 129     { 0x13, 0x0058000, 0x0020000, 0x00E0000, 0x00C8000 },
 130     { 0x13, 0x0030000, 0x0030000, 0x00D0000, 0x0180000 },
 131     { 0x14, 0x00B0000, 0x0040000, 0x01C0000, 0x0190000 },
 132     { 0x14, 0x0060000, 0x0060000, 0x01A0000, 0x0300000 },
 133     { 0x15, 0x0160000, 0x0080000, 0x0380000, 0x0320000 },
 134     { 0x15, 0x00C0000, 0x00C0000, 0x0340000, 0x0600000 },
 135     { 0x16, 0x02C0000, 0x0100000, 0x0700000, 0x0640000 },
 136     { 0x16, 0x0180000, 0x0180000, 0x0680000, 0x0C00000 },
 137     { 0x17, 0x0580000, 0x0200000, 0x0E00000, 0x0C80000 },
 138     { 0x17, 0x0300000, 0x0300000, 0x0D00000, 0x1800000 },
 139     { 0x18, 0x0B00000, 0x0400000, 0x1C00000, 0x1900000 },
 140     { 0x18, 0x0600000, 0x0600000, 0x1A00000, 0x3000000 },
 141     { 0x19, 0x1600000, 0x0800000, 0x3800000, 0x3200000 },
 142     { 0x19, 0x0C00000, 0x0C00000, 0x3400000, 0x6000000 },
 143     { 0x1A, 0x2C00000, 0x1000000, 0x7000000, 0x6400000 },
 144     { 0x1A, 0x1800000, 0x1800000, 0x6800000, 0xC000000 },
 145 };
 146
 147 static int set_bps_params(AVCodecContext *avctx)
 148 {
 149     switch (avctx->bits_per_raw_sample) {
 150     case 8:
 151         avctx->sample_fmt = AV_SAMPLE_FMT_U8P;
 152         break;
 153     case 16:
 154         avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
 155         break;
 156     case 24:
 157         avctx->sample_fmt = AV_SAMPLE_FMT_S32P;
 158         break;
 159     default:
 160         av_log(avctx, AV_LOG_ERROR, "invalid/unsupported bits per sample: %d\n",
 161                avctx->bits_per_raw_sample);
 162         return AVERROR_INVALIDDATA;
 163     }
 164
 165     return 0;
 166 }
 167
 168 static void set_sample_rate_params(AVCodecContext *avctx)
 169 {
 170     TAKDecContext *s  = avctx->priv_data;
 171     int shift;
 172
 173     if (avctx->sample_rate < 11025) {
 174         shift = 3;
 175     } else if (avctx->sample_rate < 22050) {
 176         shift = 2;
 177     } else if (avctx->sample_rate < 44100) {
 178         shift = 1;
 179     } else {
 180         shift = 0;
 181     }
 182     s->uval           = FFALIGN(avctx->sample_rate + 511LL >> 9, 4) << shift;
 183     s->subframe_scale = FFALIGN(avctx->sample_rate + 511LL >> 9, 4) << 1;
 184 }
 185
 186 static av_cold int tak_decode_init(AVCodecContext *avctx)
 187 {
 188     TAKDecContext *s = avctx->priv_data;
 189
 190     ff_audiodsp_init(&s->adsp);
 191     ff_takdsp_init(&s->tdsp);
 192
 193     s->avctx = avctx;
 194     avctx->bits_per_raw_sample = avctx->bits_per_coded_sample;
 195
 196     set_sample_rate_params(avctx);
 197
 198     return set_bps_params(avctx);
 199 }
 200
 201 static void decode_lpc(int32_t *coeffs, int mode, int length)
 202 {
 203     int i;
 204
 205     if (length < 2)
 206         return;
 207
 208     if (mode == 1) {
 209         unsigned a1 = *coeffs++;
 210         for (i = 0; i < length - 1 >> 1; i++) {
 211             *coeffs   += a1;
 212             coeffs[1] += (unsigned)*coeffs;
 213             a1         = coeffs[1];
 214             coeffs    += 2;
 215         }
 216         if (length - 1 & 1)
 217             *coeffs += a1;
 218     } else if (mode == 2) {
 219         unsigned a1    = coeffs[1];
 220         unsigned a2    = a1 + *coeffs;
 221         coeffs[1] = a2;
 222         if (length > 2) {
 223             coeffs += 2;
 224             for (i = 0; i < length - 2 >> 1; i++) {
 225                 unsigned a3    = *coeffs + a1;
 226                 unsigned a4    = a3 + a2;
 227                 *coeffs   = a4;
 228                 a1        = coeffs[1] + a3;
 229                 a2        = a1 + a4;
 230                 coeffs[1] = a2;
 231                 coeffs   += 2;
 232             }
 233             if (length & 1)
 234                 *coeffs += a1 + a2;
 235         }
 236     } else if (mode == 3) {
 237         unsigned a1    = coeffs[1];
 238         unsigned a2    = a1 + *coeffs;
 239         coeffs[1] = a2;
 240         if (length > 2) {
 241             unsigned a3  = coeffs[2];
 242             unsigned a4  = a3 + a1;
 243             unsigned a5  = a4 + a2;
 244             coeffs[2] = a5;
 245             coeffs += 3;
 246             for (i = 0; i < length - 3; i++) {
 247                 a3     += *coeffs;
 248                 a4     += a3;
 249                 a5     += a4;
 250                 *coeffs = a5;
 251                 coeffs++;
 252             }
 253         }
 254     }
 255 }
 256
 257 static int decode_segment(TAKDecContext *s, int8_t mode, int32_t *decoded, int len)
 258 {
 259     struct CParam code;
 260     GetBitContext *gb = &s->gb;
 261     int i;
 262
 263     if (!mode) {
 264         memset(decoded, 0, len * sizeof(*decoded));
 265         return 0;
 266     }
 267
 268     if (mode > FF_ARRAY_ELEMS(xcodes))
 269         return AVERROR_INVALIDDATA;
 270     code = xcodes[mode - 1];
 271
 272     for (i = 0; i < len; i++) {
 273         unsigned x = get_bits_long(gb, code.init);
 274         if (x >= code.escape && get_bits1(gb)) {
 275             x |= 1 << code.init;
 276             if (x >= code.aescape) {
 277                 unsigned scale = get_unary(gb, 1, 9);
 278                 if (scale == 9) {
 279                     int scale_bits = get_bits(gb, 3);
 280                     if (scale_bits > 0) {
 281                         if (scale_bits == 7) {
 282                             scale_bits += get_bits(gb, 5);
 283                             if (scale_bits > 29)
 284                                 return AVERROR_INVALIDDATA;
 285                         }
 286                         scale = get_bits_long(gb, scale_bits) + 1;
 287                         x    += code.scale * scale;
 288                     }
 289                     x += code.bias;
 290                 } else
 291                     x += code.scale * scale - code.escape;
 292             } else
 293                 x -= code.escape;
 294         }
 295         decoded[i] = (x >> 1) ^ -(x & 1);
 296     }
 297
 298     return 0;
 299 }
 300
 301 static int decode_residues(TAKDecContext *s, int32_t *decoded, int length)
 302 {
 303     GetBitContext *gb = &s->gb;
 304     int i, mode, ret;
 305
 306     if (length > s->nb_samples)
 307         return AVERROR_INVALIDDATA;
 308
 309     if (get_bits1(gb)) {
 310         int wlength, rval;
 311
 312         wlength = length / s->uval;
 313
 314         rval = length - (wlength * s->uval);
 315
 316         if (rval < s->uval / 2)
 317             rval += s->uval;
 318         else
 319             wlength++;
 320
 321         if (wlength <= 1 || wlength > 128)
 322             return AVERROR_INVALIDDATA;
 323
 324         s->coding_mode[0] = mode = get_bits(gb, 6);
 325
 326         for (i = 1; i < wlength; i++) {
 327             int c = get_unary(gb, 1, 6);
 328
 329             switch (c) {
 330             case 6:
 331                 mode = get_bits(gb, 6);
 332                 break;
 333             case 5:
 334             case 4:
 335             case 3: {
 336                 /* mode += sign ? (1 - c) : (c - 1) */
 337                 int sign = get_bits1(gb);
 338                 mode    += (-sign ^ (c - 1)) + sign;
 339                 break;
 340             }
 341             case 2:
 342                 mode++;
 343                 break;
 344             case 1:
 345                 mode--;
 346                 break;
 347             }
 348             s->coding_mode[i] = mode;
 349         }
 350
 351         i = 0;
 352         while (i < wlength) {
 353             int len = 0;
 354
 355             mode = s->coding_mode[i];
 356             do {
 357                 if (i >= wlength - 1)
 358                     len += rval;
 359                 else
 360                     len += s->uval;
 361                 i++;
 362
 363                 if (i == wlength)
 364                     break;
 365             } while (s->coding_mode[i] == mode);
 366
 367             if ((ret = decode_segment(s, mode, decoded, len)) < 0)
 368                 return ret;
 369             decoded += len;
 370         }
 371     } else {
 372         mode = get_bits(gb, 6);
 373         if ((ret = decode_segment(s, mode, decoded, length)) < 0)
 374             return ret;
 375     }
 376
 377     return 0;
 378 }
 379
 380 static int get_bits_esc4(GetBitContext *gb)
 381 {
 382     if (get_bits1(gb))
 383         return get_bits(gb, 4) + 1;
 384     else
 385         return 0;
 386 }
 387
 388 static int decode_subframe(TAKDecContext *s, int32_t *decoded,
 389                            int subframe_size, int prev_subframe_size)
 390 {
 391     GetBitContext *gb = &s->gb;
 392     int x, y, i, j, ret = 0;
 393     int dshift, size, filter_quant, filter_order;
 394     int tfilter[MAX_PREDICTORS];
 395
 396     if (!get_bits1(gb))
 397         return decode_residues(s, decoded, subframe_size);
 398
 399     filter_order = predictor_sizes[get_bits(gb, 4)];
 400
 401     if (prev_subframe_size > 0 && get_bits1(gb)) {
 402         if (filter_order > prev_subframe_size)
 403             return AVERROR_INVALIDDATA;
 404
 405         decoded       -= filter_order;
 406         subframe_size += filter_order;
 407
 408         if (filter_order > subframe_size)
 409             return AVERROR_INVALIDDATA;
 410     } else {
 411         int lpc_mode;
 412
 413         if (filter_order > subframe_size)
 414             return AVERROR_INVALIDDATA;
 415
 416         lpc_mode = get_bits(gb, 2);
 417         if (lpc_mode > 2)
 418             return AVERROR_INVALIDDATA;
 419
 420         if ((ret = decode_residues(s, decoded, filter_order)) < 0)
 421             return ret;
 422
 423         if (lpc_mode)
 424             decode_lpc(decoded, lpc_mode, filter_order);
 425     }
 426
 427     dshift = get_bits_esc4(gb);
 428     size   = get_bits1(gb) + 6;
 429
 430     filter_quant = 10;
 431     if (get_bits1(gb)) {
 432         filter_quant -= get_bits(gb, 3) + 1;
 433         if (filter_quant < 3)
 434             return AVERROR_INVALIDDATA;
 435     }
 436
 437     s->predictors[0] = get_sbits(gb, 10);
 438     s->predictors[1] = get_sbits(gb, 10);
 439     s->predictors[2] = get_sbits(gb, size) * (1 << (10 - size));
 440     s->predictors[3] = get_sbits(gb, size) * (1 << (10 - size));
 441     if (filter_order > 4) {
 442         int tmp = size - get_bits1(gb);
 443
 444         for (i = 4; i < filter_order; i++) {
 445             if (!(i & 3))
 446                 x = tmp - get_bits(gb, 2);
 447             s->predictors[i] = get_sbits(gb, x) * (1 << (10 - size));
 448         }
 449     }
 450
 451     tfilter[0] = s->predictors[0] * 64;
 452     for (i = 1; i < filter_order; i++) {
 453         uint32_t *p1 = &tfilter[0];
 454         uint32_t *p2 = &tfilter[i - 1];
 455
 456         for (j = 0; j < (i + 1) / 2; j++) {
 457             x     = *p1 + ((int32_t)(s->predictors[i] * *p2 + 256) >> 9);
 458             *p2  += (int32_t)(s->predictors[i] * *p1 + 256) >> 9;
 459             *p1++ = x;
 460             p2--;
 461         }
 462
 463         tfilter[i] = s->predictors[i] * 64;
 464     }
 465
 466     x = 1 << (32 - (15 - filter_quant));
 467     y = 1 << ((15 - filter_quant) - 1);
 468     for (i = 0, j = filter_order - 1; i < filter_order / 2; i++, j--) {
 469         s->filter[j] = x - ((tfilter[i] + y) >> (15 - filter_quant));
 470         s->filter[i] = x - ((tfilter[j] + y) >> (15 - filter_quant));
 471     }
 472
 473     if ((ret = decode_residues(s, &decoded[filter_order],
 474                                subframe_size - filter_order)) < 0)
 475         return ret;
 476
 477     for (i = 0; i < filter_order; i++)
 478         s->residues[i] = *decoded++ >> dshift;
 479
 480     y    = FF_ARRAY_ELEMS(s->residues) - filter_order;
 481     x    = subframe_size - filter_order;
 482     while (x > 0) {
 483         int tmp = FFMIN(y, x);
 484
 485         for (i = 0; i < tmp; i++) {
 486             int v = 1 << (filter_quant - 1);
 487
 488             if (filter_order & -16)
 489                 v += (unsigned)s->adsp.scalarproduct_int16(&s->residues[i], s->filter,
 490                                                  filter_order & -16);
 491             for (j = filter_order & -16; j < filter_order; j += 4) {
 492                 v += s->residues[i + j + 3] * (unsigned)s->filter[j + 3] +
 493                      s->residues[i + j + 2] * (unsigned)s->filter[j + 2] +
 494                      s->residues[i + j + 1] * (unsigned)s->filter[j + 1] +
 495                      s->residues[i + j    ] * (unsigned)s->filter[j    ];
 496             }
 497             v = (av_clip_intp2(v >> filter_quant, 13) * (1 << dshift)) - (unsigned)*decoded;
 498             *decoded++ = v;
 499             s->residues[filter_order + i] = v >> dshift;
 500         }
 501
 502         x -= tmp;
 503         if (x > 0)
 504             memcpy(s->residues, &s->residues[y], 2 * filter_order);
 505     }
 506
 507     return 0;
 508 }
 509
 510 static int decode_channel(TAKDecContext *s, int chan)
 511 {
 512     AVCodecContext *avctx = s->avctx;
 513     GetBitContext *gb     = &s->gb;
 514     int32_t *decoded      = s->decoded[chan];
 515     int left              = s->nb_samples - 1;
 516     int i = 0, ret, prev = 0;
 517
 518     s->sample_shift[chan] = get_bits_esc4(gb);
 519     if (s->sample_shift[chan] >= avctx->bits_per_raw_sample)
 520         return AVERROR_INVALIDDATA;
 521
 522     *decoded++ = get_sbits(gb, avctx->bits_per_raw_sample - s->sample_shift[chan]);
 523     s->lpc_mode[chan] = get_bits(gb, 2);
 524     s->nb_subframes   = get_bits(gb, 3) + 1;
 525
 526     if (s->nb_subframes > 1) {
 527         if (get_bits_left(gb) < (s->nb_subframes - 1) * 6)
 528             return AVERROR_INVALIDDATA;
 529
 530         for (; i < s->nb_subframes - 1; i++) {
 531             int v = get_bits(gb, 6);
 532
 533             s->subframe_len[i] = (v - prev) * s->subframe_scale;
 534             if (s->subframe_len[i] <= 0)
 535                 return AVERROR_INVALIDDATA;
 536
 537             left -= s->subframe_len[i];
 538             prev  = v;
 539         }
 540
 541         if (left <= 0)
 542             return AVERROR_INVALIDDATA;
 543     }
 544     s->subframe_len[i] = left;
 545
 546     prev = 0;
 547     for (i = 0; i < s->nb_subframes; i++) {
 548         if ((ret = decode_subframe(s, decoded, s->subframe_len[i], prev)) < 0)
 549             return ret;
 550         decoded += s->subframe_len[i];
 551         prev     = s->subframe_len[i];
 552     }
 553
 554     return 0;
 555 }
 556
 557 static int decorrelate(TAKDecContext *s, int c1, int c2, int length)
 558 {
 559     GetBitContext *gb = &s->gb;
 560     int32_t *p1       = s->decoded[c1] + (s->dmode > 5);
 561     int32_t *p2       = s->decoded[c2] + (s->dmode > 5);
 562     int32_t bp1       = p1[0];
 563     int32_t bp2       = p2[0];
 564     int i;
 565     int dshift, dfactor;
 566
 567     length += s->dmode < 6;
 568
 569     switch (s->dmode) {
 570     case 1: /* left/side */
 571         s->tdsp.decorrelate_ls(p1, p2, length);
 572         break;
 573     case 2: /* side/right */
 574         s->tdsp.decorrelate_sr(p1, p2, length);
 575         break;
 576     case 3: /* side/mid */
 577         s->tdsp.decorrelate_sm(p1, p2, length);
 578         break;
 579     case 4: /* side/left with scale factor */
 580         FFSWAP(int32_t*, p1, p2);
 581         FFSWAP(int32_t, bp1, bp2);
 582     case 5: /* side/right with scale factor */
 583         dshift  = get_bits_esc4(gb);
 584         dfactor = get_sbits(gb, 10);
 585         s->tdsp.decorrelate_sf(p1, p2, length, dshift, dfactor);
 586         break;
 587     case 6:
 588         FFSWAP(int32_t*, p1, p2);
 589     case 7: {
 590         int length2, order_half, filter_order, dval1, dval2;
 591         int tmp, x, code_size;
 592
 593         if (length < 256)
 594             return AVERROR_INVALIDDATA;
 595
 596         dshift       = get_bits_esc4(gb);
 597         filter_order = 8 << get_bits1(gb);
 598         dval1        = get_bits1(gb);
 599         dval2        = get_bits1(gb);
 600
 601         for (i = 0; i < filter_order; i++) {
 602             if (!(i & 3))
 603                 code_size = 14 - get_bits(gb, 3);
 604             s->filter[i] = get_sbits(gb, code_size);
 605         }
 606
 607         order_half = filter_order / 2;
 608         length2    = length - (filter_order - 1);
 609
 610         /* decorrelate beginning samples */
 611         if (dval1) {
 612             for (i = 0; i < order_half; i++) {
 613                 int32_t a = p1[i];
 614                 int32_t b = p2[i];
 615                 p1[i]     = a + b;
 616             }
 617         }
 618
 619         /* decorrelate ending samples */
 620         if (dval2) {
 621             for (i = length2 + order_half; i < length; i++) {
 622                 int32_t a = p1[i];
 623                 int32_t b = p2[i];
 624                 p1[i]     = a + b;
 625             }
 626         }
 627
 628
 629         for (i = 0; i < filter_order; i++)
 630             s->residues[i] = *p2++ >> dshift;
 631
 632         p1 += order_half;
 633         x = FF_ARRAY_ELEMS(s->residues) - filter_order;
 634         for (; length2 > 0; length2 -= tmp) {
 635             tmp = FFMIN(length2, x);
 636
 637             for (i = 0; i < tmp - (tmp == length2); i++)
 638                 s->residues[filter_order + i] = *p2++ >> dshift;
 639
 640             for (i = 0; i < tmp; i++) {
 641                 int v = 1 << 9;
 642
 643                 if (filter_order == 16) {
 644                     v += s->adsp.scalarproduct_int16(&s->residues[i], s->filter,
 645                                                      filter_order);
 646                 } else {
 647                     v += s->residues[i + 7] * s->filter[7] +
 648                          s->residues[i + 6] * s->filter[6] +
 649                          s->residues[i + 5] * s->filter[5] +
 650                          s->residues[i + 4] * s->filter[4] +
 651                          s->residues[i + 3] * s->filter[3] +
 652                          s->residues[i + 2] * s->filter[2] +
 653                          s->residues[i + 1] * s->filter[1] +
 654                          s->residues[i    ] * s->filter[0];
 655                 }
 656
 657                 v = av_clip_intp2(v >> 10, 13) * (1U << dshift) - *p1;
 658                 *p1++ = v;
 659             }
 660
 661             memmove(s->residues, &s->residues[tmp], 2 * filter_order);
 662         }
 663         break;
 664     }
 665     }
 666
 667     if (s->dmode > 0 && s->dmode < 6) {
 668         p1[0] = bp1;
 669         p2[0] = bp2;
 670     }
 671
 672     return 0;
 673 }
 674
 675 static int tak_decode_frame(AVCodecContext *avctx, AVFrame *frame,
 676                             int *got_frame_ptr, AVPacket *pkt)
 677 {
 678     TAKDecContext *s  = avctx->priv_data;
 679     GetBitContext *gb = &s->gb;
 680     int chan, i, ret, hsize;
 681
 682     if (pkt->size < TAK_MIN_FRAME_HEADER_BYTES)
 683         return AVERROR_INVALIDDATA;
 684
 685     if ((ret = init_get_bits8(gb, pkt->data, pkt->size)) < 0)
 686         return ret;
 687
 688     if ((ret = ff_tak_decode_frame_header(avctx, gb, &s->ti, 0)) < 0)
 689         return ret;
 690
 691     hsize = get_bits_count(gb) / 8;
 692     if (avctx->err_recognition & (AV_EF_CRCCHECK|AV_EF_COMPLIANT)) {
 693         if (ff_tak_check_crc(pkt->data, hsize)) {
 694             av_log(avctx, AV_LOG_ERROR, "CRC error\n");
 695             if (avctx->err_recognition & AV_EF_EXPLODE)
 696                 return AVERROR_INVALIDDATA;
 697         }
 698     }
 699
 700     if (s->ti.codec != TAK_CODEC_MONO_STEREO &&
 701         s->ti.codec != TAK_CODEC_MULTICHANNEL) {
 702         avpriv_report_missing_feature(avctx, "TAK codec type %d", s->ti.codec);
 703         return AVERROR_PATCHWELCOME;
 704     }
 705     if (s->ti.data_type) {
 706         av_log(avctx, AV_LOG_ERROR,
 707                "unsupported data type: %d\n", s->ti.data_type);
 708         return AVERROR_INVALIDDATA;
 709     }
 710     if (s->ti.codec == TAK_CODEC_MONO_STEREO && s->ti.channels > 2) {
 711         av_log(avctx, AV_LOG_ERROR,
 712                "invalid number of channels: %d\n", s->ti.channels);
 713         return AVERROR_INVALIDDATA;
 714     }
 715     if (s->ti.channels > 6) {
 716         av_log(avctx, AV_LOG_ERROR,
 717                "unsupported number of channels: %d\n", s->ti.channels);
 718         return AVERROR_INVALIDDATA;
 719     }
 720
 721     if (s->ti.frame_samples <= 0) {
 722         av_log(avctx, AV_LOG_ERROR, "unsupported/invalid number of samples\n");
 723         return AVERROR_INVALIDDATA;
 724     }
 725
 726     avctx->bits_per_raw_sample = s->ti.bps;
 727     if ((ret = set_bps_params(avctx)) < 0)
 728         return ret;
 729     if (s->ti.sample_rate != avctx->sample_rate) {
 730         avctx->sample_rate = s->ti.sample_rate;
 731         set_sample_rate_params(avctx);
 732     }
 733
 734     av_channel_layout_uninit(&avctx->ch_layout);
 735     if (s->ti.ch_layout) {
 736         av_channel_layout_from_mask(&avctx->ch_layout, s->ti.ch_layout);
 737     } else {
 738         avctx->ch_layout.order       = AV_CHANNEL_ORDER_UNSPEC;
 739         avctx->ch_layout.nb_channels = s->ti.channels;
 740     }
 741
 742     s->nb_samples = s->ti.last_frame_samples ? s->ti.last_frame_samples
 743                                              : s->ti.frame_samples;
 744
 745     frame->nb_samples = s->nb_samples;
 746     if ((ret = ff_thread_get_buffer(avctx, frame, 0)) < 0)
 747         return ret;
 748     ff_thread_finish_setup(avctx);
 749
 750     if (avctx->bits_per_raw_sample <= 16) {
 751         int buf_size = av_samples_get_buffer_size(NULL, avctx->ch_layout.nb_channels,
 752                                                   s->nb_samples,
 753                                                   AV_SAMPLE_FMT_S32P, 0);
 754         if (buf_size < 0)
 755             return buf_size;
 756         av_fast_malloc(&s->decode_buffer, &s->decode_buffer_size, buf_size);
 757         if (!s->decode_buffer)
 758             return AVERROR(ENOMEM);
 759         ret = av_samples_fill_arrays((uint8_t **)s->decoded, NULL,
 760                                      s->decode_buffer, avctx->ch_layout.nb_channels,
 761                                      s->nb_samples, AV_SAMPLE_FMT_S32P, 0);
 762         if (ret < 0)
 763             return ret;
 764     } else {
 765         for (chan = 0; chan < avctx->ch_layout.nb_channels; chan++)
 766             s->decoded[chan] = (int32_t *)frame->extended_data[chan];
 767     }
 768
 769     if (s->nb_samples < 16) {
 770         for (chan = 0; chan < avctx->ch_layout.nb_channels; chan++) {
 771             int32_t *decoded = s->decoded[chan];
 772             for (i = 0; i < s->nb_samples; i++)
 773                 decoded[i] = get_sbits(gb, avctx->bits_per_raw_sample);
 774         }
 775     } else {
 776         if (s->ti.codec == TAK_CODEC_MONO_STEREO) {
 777             for (chan = 0; chan < avctx->ch_layout.nb_channels; chan++)
 778                 if (ret = decode_channel(s, chan))
 779                     return ret;
 780
 781             if (avctx->ch_layout.nb_channels == 2) {
 782                 s->nb_subframes = get_bits(gb, 1) + 1;
 783                 if (s->nb_subframes > 1) {
 784                     s->subframe_len[1] = get_bits(gb, 6);
 785                 }
 786
 787                 s->dmode = get_bits(gb, 3);
 788                 if (ret = decorrelate(s, 0, 1, s->nb_samples - 1))
 789                     return ret;
 790             }
 791         } else if (s->ti.codec == TAK_CODEC_MULTICHANNEL) {
 792             if (get_bits1(gb)) {
 793                 int ch_mask = 0;
 794
 795                 chan = get_bits(gb, 4) + 1;
 796                 if (chan > avctx->ch_layout.nb_channels)
 797                     return AVERROR_INVALIDDATA;
 798
 799                 for (i = 0; i < chan; i++) {
 800                     int nbit = get_bits(gb, 4);
 801
 802                     if (nbit >= avctx->ch_layout.nb_channels)
 803                         return AVERROR_INVALIDDATA;
 804
 805                     if (ch_mask & 1 << nbit)
 806                         return AVERROR_INVALIDDATA;
 807
 808                     s->mcdparams[i].present = get_bits1(gb);
 809                     if (s->mcdparams[i].present) {
 810                         s->mcdparams[i].index = get_bits(gb, 2);
 811                         s->mcdparams[i].chan2 = get_bits(gb, 4);
 812                         if (s->mcdparams[i].chan2 >= avctx->ch_layout.nb_channels) {
 813                             av_log(avctx, AV_LOG_ERROR,
 814                                    "invalid channel 2 (%d) for %d channel(s)\n",
 815                                    s->mcdparams[i].chan2, avctx->ch_layout.nb_channels);
 816                             return AVERROR_INVALIDDATA;
 817                         }
 818                         if (s->mcdparams[i].index == 1) {
 819                             if ((nbit == s->mcdparams[i].chan2) ||
 820                                 (ch_mask & 1 << s->mcdparams[i].chan2))
 821                                 return AVERROR_INVALIDDATA;
 822
 823                             ch_mask |= 1 << s->mcdparams[i].chan2;
 824                         } else if (!(ch_mask & 1 << s->mcdparams[i].chan2)) {
 825                             return AVERROR_INVALIDDATA;
 826                         }
 827                     }
 828                     s->mcdparams[i].chan1 = nbit;
 829
 830                     ch_mask |= 1 << nbit;
 831                 }
 832             } else {
 833                 chan = avctx->ch_layout.nb_channels;
 834                 for (i = 0; i < chan; i++) {
 835                     s->mcdparams[i].present = 0;
 836                     s->mcdparams[i].chan1   = i;
 837                 }
 838             }
 839
 840             for (i = 0; i < chan; i++) {
 841                 if (s->mcdparams[i].present && s->mcdparams[i].index == 1)
 842                     if (ret = decode_channel(s, s->mcdparams[i].chan2))
 843                         return ret;
 844
 845                 if (ret = decode_channel(s, s->mcdparams[i].chan1))
 846                     return ret;
 847
 848                 if (s->mcdparams[i].present) {
 849                     s->dmode = mc_dmodes[s->mcdparams[i].index];
 850                     if (ret = decorrelate(s,
 851                                           s->mcdparams[i].chan2,
 852                                           s->mcdparams[i].chan1,
 853                                           s->nb_samples - 1))
 854                         return ret;
 855                 }
 856             }
 857         }
 858
 859         for (chan = 0; chan < avctx->ch_layout.nb_channels; chan++) {
 860             int32_t *decoded = s->decoded[chan];
 861
 862             if (s->lpc_mode[chan])
 863                 decode_lpc(decoded, s->lpc_mode[chan], s->nb_samples);
 864
 865             if (s->sample_shift[chan] > 0)
 866                 for (i = 0; i < s->nb_samples; i++)
 867                     decoded[i] *= 1U << s->sample_shift[chan];
 868         }
 869     }
 870
 871     align_get_bits(gb);
 872     skip_bits(gb, 24);
 873     if (get_bits_left(gb) < 0)
 874         av_log(avctx, AV_LOG_DEBUG, "overread\n");
 875     else if (get_bits_left(gb) > 0)
 876         av_log(avctx, AV_LOG_DEBUG, "underread\n");
 877
 878     if (avctx->err_recognition & (AV_EF_CRCCHECK | AV_EF_COMPLIANT)) {
 879         if (ff_tak_check_crc(pkt->data + hsize,
 880                              get_bits_count(gb) / 8 - hsize)) {
 881             av_log(avctx, AV_LOG_ERROR, "CRC error\n");
 882             if (avctx->err_recognition & AV_EF_EXPLODE)
 883                 return AVERROR_INVALIDDATA;
 884         }
 885     }
 886
 887     /* convert to output buffer */
 888     switch (avctx->sample_fmt) {
 889     case AV_SAMPLE_FMT_U8P:
 890         for (chan = 0; chan < avctx->ch_layout.nb_channels; chan++) {
 891             uint8_t *samples = (uint8_t *)frame->extended_data[chan];
 892             int32_t *decoded = s->decoded[chan];
 893             for (i = 0; i < s->nb_samples; i++)
 894                 samples[i] = decoded[i] + 0x80U;
 895         }
 896         break;
 897     case AV_SAMPLE_FMT_S16P:
 898         for (chan = 0; chan < avctx->ch_layout.nb_channels; chan++) {
 899             int16_t *samples = (int16_t *)frame->extended_data[chan];
 900             int32_t *decoded = s->decoded[chan];
 901             for (i = 0; i < s->nb_samples; i++)
 902                 samples[i] = decoded[i];
 903         }
 904         break;
 905     case AV_SAMPLE_FMT_S32P:
 906         for (chan = 0; chan < avctx->ch_layout.nb_channels; chan++) {
 907             int32_t *samples = (int32_t *)frame->extended_data[chan];
 908             for (i = 0; i < s->nb_samples; i++)
 909                 samples[i] *= 1U << 8;
 910         }
 911         break;
 912     }
 913
 914     *got_frame_ptr = 1;
 915
 916     return pkt->size;
 917 }
 918
 919 #if HAVE_THREADS
 920 static int update_thread_context(AVCodecContext *dst,
 921                                  const AVCodecContext *src)
 922 {
 923     TAKDecContext *tsrc = src->priv_data;
 924     TAKDecContext *tdst = dst->priv_data;
 925
 926     if (dst == src)
 927         return 0;
 928     memcpy(&tdst->ti, &tsrc->ti, sizeof(TAKStreamInfo));
 929     return 0;
 930 }
 931 #endif
 932
 933 static av_cold int tak_decode_close(AVCodecContext *avctx)
 934 {
 935     TAKDecContext *s = avctx->priv_data;
 936
 937     av_freep(&s->decode_buffer);
 938
 939     return 0;
 940 }
 941
 942 const FFCodec ff_tak_decoder = {
 943     .p.name           = "tak",
 944     CODEC_LONG_NAME("TAK (Tom's lossless Audio Kompressor)"),
 945     .p.type           = AVMEDIA_TYPE_AUDIO,
 946     .p.id             = AV_CODEC_ID_TAK,
 947     .priv_data_size   = sizeof(TAKDecContext),
 948     .init             = tak_decode_init,
 949     .close            = tak_decode_close,
 950     FF_CODEC_DECODE_CB(tak_decode_frame),
 951     UPDATE_THREAD_CONTEXT(update_thread_context),
 952     .p.capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS | AV_CODEC_CAP_CHANNEL_CONF,
 953     .p.sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_U8P,
 954                                                         AV_SAMPLE_FMT_S16P,
 955                                                         AV_SAMPLE_FMT_S32P,
 956                                                         AV_SAMPLE_FMT_NONE },
 957 };