3 * Copyright (c) 2012 Paul B Mahol
5 * This file is part of FFmpeg.
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.
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.
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
24 * TAK (Tom's lossless Audio Kompressor) decoder
25 * @author Paul B Mahol
28 #include "libavutil/internal.h"
29 #include "libavutil/samplefmt.h"
36 #define MAX_SUBFRAMES 8 ///< max number of subframes per channel
37 #define MAX_PREDICTORS 256
39 typedef struct MCDParam {
40 int8_t present; ///< decorrelation parameter availability for this channel
41 int8_t index; ///< index into array of decorrelation types
46 typedef struct TAKDecContext {
47 AVCodecContext *avctx; ///< parent AVCodecContext
50 GetBitContext gb; ///< bitstream reader initialized to start at the current frame
53 int nb_samples; ///< number of samples in the current frame
54 uint8_t *decode_buffer;
55 unsigned int decode_buffer_size;
56 int32_t *decoded[TAK_MAX_CHANNELS]; ///< decoded samples for each channel
58 int8_t lpc_mode[TAK_MAX_CHANNELS];
59 int8_t sample_shift[TAK_MAX_CHANNELS]; ///< shift applied to every sample in the channel
60 int16_t predictors[MAX_PREDICTORS];
61 int nb_subframes; ///< number of subframes in the current frame
62 int16_t subframe_len[MAX_SUBFRAMES]; ///< subframe length in samples
65 int8_t dmode; ///< channel decorrelation type in the current frame
67 MCDParam mcdparams[TAK_MAX_CHANNELS]; ///< multichannel decorrelation parameters
69 int8_t coding_mode[128];
70 DECLARE_ALIGNED(16, int16_t, filter)[MAX_PREDICTORS];
71 DECLARE_ALIGNED(16, int16_t, residues)[544];
74 static const int8_t mc_dmodes[] = { 1, 3, 4, 6, };
76 static const uint16_t predictor_sizes[] = {
77 4, 8, 12, 16, 24, 32, 48, 64, 80, 96, 128, 160, 192, 224, 256, 0,
80 static const struct CParam {
87 { 0x01, 0x0000001, 0x0000001, 0x0000003, 0x0000008 },
88 { 0x02, 0x0000003, 0x0000001, 0x0000007, 0x0000006 },
89 { 0x03, 0x0000005, 0x0000002, 0x000000E, 0x000000D },
90 { 0x03, 0x0000003, 0x0000003, 0x000000D, 0x0000018 },
91 { 0x04, 0x000000B, 0x0000004, 0x000001C, 0x0000019 },
92 { 0x04, 0x0000006, 0x0000006, 0x000001A, 0x0000030 },
93 { 0x05, 0x0000016, 0x0000008, 0x0000038, 0x0000032 },
94 { 0x05, 0x000000C, 0x000000C, 0x0000034, 0x0000060 },
95 { 0x06, 0x000002C, 0x0000010, 0x0000070, 0x0000064 },
96 { 0x06, 0x0000018, 0x0000018, 0x0000068, 0x00000C0 },
97 { 0x07, 0x0000058, 0x0000020, 0x00000E0, 0x00000C8 },
98 { 0x07, 0x0000030, 0x0000030, 0x00000D0, 0x0000180 },
99 { 0x08, 0x00000B0, 0x0000040, 0x00001C0, 0x0000190 },
100 { 0x08, 0x0000060, 0x0000060, 0x00001A0, 0x0000300 },
101 { 0x09, 0x0000160, 0x0000080, 0x0000380, 0x0000320 },
102 { 0x09, 0x00000C0, 0x00000C0, 0x0000340, 0x0000600 },
103 { 0x0A, 0x00002C0, 0x0000100, 0x0000700, 0x0000640 },
104 { 0x0A, 0x0000180, 0x0000180, 0x0000680, 0x0000C00 },
105 { 0x0B, 0x0000580, 0x0000200, 0x0000E00, 0x0000C80 },
106 { 0x0B, 0x0000300, 0x0000300, 0x0000D00, 0x0001800 },
107 { 0x0C, 0x0000B00, 0x0000400, 0x0001C00, 0x0001900 },
108 { 0x0C, 0x0000600, 0x0000600, 0x0001A00, 0x0003000 },
109 { 0x0D, 0x0001600, 0x0000800, 0x0003800, 0x0003200 },
110 { 0x0D, 0x0000C00, 0x0000C00, 0x0003400, 0x0006000 },
111 { 0x0E, 0x0002C00, 0x0001000, 0x0007000, 0x0006400 },
112 { 0x0E, 0x0001800, 0x0001800, 0x0006800, 0x000C000 },
113 { 0x0F, 0x0005800, 0x0002000, 0x000E000, 0x000C800 },
114 { 0x0F, 0x0003000, 0x0003000, 0x000D000, 0x0018000 },
115 { 0x10, 0x000B000, 0x0004000, 0x001C000, 0x0019000 },
116 { 0x10, 0x0006000, 0x0006000, 0x001A000, 0x0030000 },
117 { 0x11, 0x0016000, 0x0008000, 0x0038000, 0x0032000 },
118 { 0x11, 0x000C000, 0x000C000, 0x0034000, 0x0060000 },
119 { 0x12, 0x002C000, 0x0010000, 0x0070000, 0x0064000 },
120 { 0x12, 0x0018000, 0x0018000, 0x0068000, 0x00C0000 },
121 { 0x13, 0x0058000, 0x0020000, 0x00E0000, 0x00C8000 },
122 { 0x13, 0x0030000, 0x0030000, 0x00D0000, 0x0180000 },
123 { 0x14, 0x00B0000, 0x0040000, 0x01C0000, 0x0190000 },
124 { 0x14, 0x0060000, 0x0060000, 0x01A0000, 0x0300000 },
125 { 0x15, 0x0160000, 0x0080000, 0x0380000, 0x0320000 },
126 { 0x15, 0x00C0000, 0x00C0000, 0x0340000, 0x0600000 },
127 { 0x16, 0x02C0000, 0x0100000, 0x0700000, 0x0640000 },
128 { 0x16, 0x0180000, 0x0180000, 0x0680000, 0x0C00000 },
129 { 0x17, 0x0580000, 0x0200000, 0x0E00000, 0x0C80000 },
130 { 0x17, 0x0300000, 0x0300000, 0x0D00000, 0x1800000 },
131 { 0x18, 0x0B00000, 0x0400000, 0x1C00000, 0x1900000 },
132 { 0x18, 0x0600000, 0x0600000, 0x1A00000, 0x3000000 },
133 { 0x19, 0x1600000, 0x0800000, 0x3800000, 0x3200000 },
134 { 0x19, 0x0C00000, 0x0C00000, 0x3400000, 0x6000000 },
135 { 0x1A, 0x2C00000, 0x1000000, 0x7000000, 0x6400000 },
136 { 0x1A, 0x1800000, 0x1800000, 0x6800000, 0xC000000 },
139 static int set_bps_params(AVCodecContext *avctx)
141 switch (avctx->bits_per_raw_sample) {
143 avctx->sample_fmt = AV_SAMPLE_FMT_U8P;
146 avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
149 avctx->sample_fmt = AV_SAMPLE_FMT_S32P;
152 av_log(avctx, AV_LOG_ERROR, "invalid/unsupported bits per sample: %d\n",
153 avctx->bits_per_raw_sample);
154 return AVERROR_INVALIDDATA;
160 static void set_sample_rate_params(AVCodecContext *avctx)
162 TAKDecContext *s = avctx->priv_data;
163 int shift = 3 - (avctx->sample_rate / 11025);
164 shift = FFMAX(0, shift);
165 s->uval = FFALIGN(avctx->sample_rate + 511 >> 9, 4) << shift;
166 s->subframe_scale = FFALIGN(avctx->sample_rate + 511 >> 9, 4) << 1;
169 static av_cold int tak_decode_init(AVCodecContext *avctx)
171 TAKDecContext *s = avctx->priv_data;
174 ff_dsputil_init(&s->dsp, avctx);
177 avctx->bits_per_raw_sample = avctx->bits_per_coded_sample;
179 set_sample_rate_params(avctx);
181 return set_bps_params(avctx);
184 static void decode_lpc(int32_t *coeffs, int mode, int length)
193 for (i = 0; i < length - 1 >> 1; i++) {
195 coeffs[1] += *coeffs;
201 } else if (mode == 2) {
203 int a2 = a1 + *coeffs;
207 for (i = 0; i < length - 2 >> 1; i++) {
208 int a3 = *coeffs + a1;
219 } else if (mode == 3) {
221 int a2 = a1 + *coeffs;
228 for (i = 0; i < length - 3; i++) {
239 static int decode_segment(TAKDecContext *s, int8_t mode, int32_t *decoded, int len)
242 GetBitContext *gb = &s->gb;
246 memset(decoded, 0, len * sizeof(*decoded));
250 if (mode > FF_ARRAY_ELEMS(xcodes))
251 return AVERROR_INVALIDDATA;
252 code = xcodes[mode - 1];
254 for (i = 0; i < len; i++) {
255 int x = get_bits_long(gb, code.init);
256 if (x >= code.escape && get_bits1(gb)) {
258 if (x >= code.aescape) {
259 int scale = get_unary(gb, 1, 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);
266 return AVERROR_INVALIDDATA;
268 scale = get_bits_long(gb, scale_bits) + 1;
269 x += code.scale * scale;
273 x += code.scale * scale - code.escape;
277 decoded[i] = (x >> 1) ^ -(x & 1);
283 static int decode_residues(TAKDecContext *s, int32_t *decoded, int length)
285 GetBitContext *gb = &s->gb;
288 if (length > s->nb_samples)
289 return AVERROR_INVALIDDATA;
294 wlength = length / s->uval;
296 rval = length - (wlength * s->uval);
298 if (rval < s->uval / 2)
303 if (wlength <= 1 || wlength > 128)
304 return AVERROR_INVALIDDATA;
306 s->coding_mode[0] = mode = get_bits(gb, 6);
308 for (i = 1; i < wlength; i++) {
309 int c = get_unary(gb, 1, 6);
313 mode = get_bits(gb, 6);
318 /* mode += sign ? (1 - c) : (c - 1) */
319 int sign = get_bits1(gb);
320 mode += (-sign ^ (c - 1)) + sign;
330 s->coding_mode[i] = mode;
334 while (i < wlength) {
337 mode = s->coding_mode[i];
339 if (i >= wlength - 1)
347 } while (s->coding_mode[i] == mode);
349 if ((ret = decode_segment(s, mode, decoded, len)) < 0)
354 mode = get_bits(gb, 6);
355 if ((ret = decode_segment(s, mode, decoded, length)) < 0)
362 static int get_bits_esc4(GetBitContext *gb)
365 return get_bits(gb, 4) + 1;
370 static int decode_subframe(TAKDecContext *s, int32_t *decoded,
371 int subframe_size, int prev_subframe_size)
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];
379 return decode_residues(s, decoded, subframe_size);
381 filter_order = predictor_sizes[get_bits(gb, 4)];
383 if (prev_subframe_size > 0 && get_bits1(gb)) {
384 if (filter_order > prev_subframe_size)
385 return AVERROR_INVALIDDATA;
387 decoded -= filter_order;
388 subframe_size += filter_order;
390 if (filter_order > subframe_size)
391 return AVERROR_INVALIDDATA;
395 if (filter_order > subframe_size)
396 return AVERROR_INVALIDDATA;
398 lpc_mode = get_bits(gb, 2);
400 return AVERROR_INVALIDDATA;
402 if ((ret = decode_residues(s, decoded, filter_order)) < 0)
406 decode_lpc(decoded, lpc_mode, filter_order);
409 dshift = get_bits_esc4(gb);
410 size = get_bits1(gb) + 6;
414 filter_quant -= get_bits(gb, 3) + 1;
415 if (filter_quant < 3)
416 return AVERROR_INVALIDDATA;
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);
426 for (i = 4; i < filter_order; i++) {
428 x = tmp - get_bits(gb, 2);
429 s->predictors[i] = get_sbits(gb, x) << (10 - size);
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];
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;
445 tfilter[i] = s->predictors[i] << 6;
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));
456 if ((ret = decode_residues(s, &decoded[filter_order],
457 subframe_size - filter_order)) < 0)
460 for (i = 0; i < filter_order; i++)
461 s->residues[i] = *decoded++ >> dshift;
463 y = FF_ARRAY_ELEMS(s->residues) - filter_order;
464 x = subframe_size - filter_order;
468 for (i = 0; i < tmp; i++) {
469 int v = 1 << (filter_quant - 1);
471 if (!(filter_order & 15)) {
472 v += s->dsp.scalarproduct_int16(&s->residues[i], s->filter,
474 } else if (filter_order & 4) {
475 for (j = 0; j < filter_order; j += 4) {
476 v += s->residues[i + j + 3] * s->filter[j + 3] +
477 s->residues[i + j + 2] * s->filter[j + 2] +
478 s->residues[i + j + 1] * s->filter[j + 1] +
479 s->residues[i + j ] * s->filter[j ];
482 for (j = 0; j < filter_order; j += 8) {
483 v += s->residues[i + j + 7] * s->filter[j + 7] +
484 s->residues[i + j + 6] * s->filter[j + 6] +
485 s->residues[i + j + 5] * s->filter[j + 5] +
486 s->residues[i + j + 4] * s->filter[j + 4] +
487 s->residues[i + j + 3] * s->filter[j + 3] +
488 s->residues[i + j + 2] * s->filter[j + 2] +
489 s->residues[i + j + 1] * s->filter[j + 1] +
490 s->residues[i + j ] * s->filter[j ];
493 v = (av_clip(v >> filter_quant, -8192, 8191) << dshift) - *decoded;
495 s->residues[filter_order + i] = v >> dshift;
500 memcpy(s->residues, &s->residues[y], 2 * filter_order);
508 static int decode_channel(TAKDecContext *s, int chan)
510 AVCodecContext *avctx = s->avctx;
511 GetBitContext *gb = &s->gb;
512 int32_t *decoded = s->decoded[chan];
513 int left = s->nb_samples - 1;
514 int i = 0, ret, prev = 0;
516 s->sample_shift[chan] = get_bits_esc4(gb);
517 if (s->sample_shift[chan] >= avctx->bits_per_raw_sample)
518 return AVERROR_INVALIDDATA;
520 *decoded++ = get_sbits(gb, avctx->bits_per_raw_sample - s->sample_shift[chan]);
521 s->lpc_mode[chan] = get_bits(gb, 2);
522 s->nb_subframes = get_bits(gb, 3) + 1;
524 if (s->nb_subframes > 1) {
525 if (get_bits_left(gb) < (s->nb_subframes - 1) * 6)
526 return AVERROR_INVALIDDATA;
528 for (; i < s->nb_subframes - 1; i++) {
529 int v = get_bits(gb, 6);
531 s->subframe_len[i] = (v - prev) * s->subframe_scale;
532 if (s->subframe_len[i] <= 0)
533 return AVERROR_INVALIDDATA;
535 left -= s->subframe_len[i];
540 return AVERROR_INVALIDDATA;
542 s->subframe_len[i] = left;
545 for (i = 0; i < s->nb_subframes; i++) {
546 if ((ret = decode_subframe(s, decoded, s->subframe_len[i], prev)) < 0)
548 decoded += s->subframe_len[i];
549 prev = s->subframe_len[i];
555 static int decorrelate(TAKDecContext *s, int c1, int c2, int length)
557 GetBitContext *gb = &s->gb;
558 int32_t *p1 = s->decoded[c1] + 1;
559 int32_t *p2 = s->decoded[c2] + 1;
564 case 1: /* left/side */
565 for (i = 0; i < length; i++) {
571 case 2: /* side/right */
572 for (i = 0; i < length; i++) {
578 case 3: /* side/mid */
579 for (i = 0; i < length; i++) {
587 case 4: /* side/left with scale factor */
588 FFSWAP(int32_t*, p1, p2);
589 case 5: /* side/right with scale factor */
590 dshift = get_bits_esc4(gb);
591 dfactor = get_sbits(gb, 10);
592 for (i = 0; i < length; i++) {
595 b = dfactor * (b >> dshift) + 128 >> 8 << dshift;
600 FFSWAP(int32_t*, p1, p2);
602 int length2, order_half, filter_order, dval1, dval2;
603 int tmp, x, code_size;
606 return AVERROR_INVALIDDATA;
608 dshift = get_bits_esc4(gb);
609 filter_order = 8 << get_bits1(gb);
610 dval1 = get_bits1(gb);
611 dval2 = get_bits1(gb);
613 for (i = 0; i < filter_order; i++) {
615 code_size = 14 - get_bits(gb, 3);
616 s->filter[i] = get_sbits(gb, code_size);
619 order_half = filter_order / 2;
620 length2 = length - (filter_order - 1);
622 /* decorrelate beginning samples */
624 for (i = 0; i < order_half; i++) {
631 /* decorrelate ending samples */
633 for (i = length2 + order_half; i < length; i++) {
641 for (i = 0; i < filter_order; i++)
642 s->residues[i] = *p2++ >> dshift;
645 x = FF_ARRAY_ELEMS(s->residues) - filter_order;
646 for (; length2 > 0; length2 -= tmp) {
647 tmp = FFMIN(length2, x);
649 for (i = 0; i < tmp; i++)
650 s->residues[filter_order + i] = *p2++ >> dshift;
652 for (i = 0; i < tmp; i++) {
655 if (filter_order == 16) {
656 v += s->dsp.scalarproduct_int16(&s->residues[i], s->filter,
659 v += s->residues[i + 7] * s->filter[7] +
660 s->residues[i + 6] * s->filter[6] +
661 s->residues[i + 5] * s->filter[5] +
662 s->residues[i + 4] * s->filter[4] +
663 s->residues[i + 3] * s->filter[3] +
664 s->residues[i + 2] * s->filter[2] +
665 s->residues[i + 1] * s->filter[1] +
666 s->residues[i ] * s->filter[0];
669 v = (av_clip(v >> 10, -8192, 8191) << dshift) - *p1;
673 memcpy(s->residues, &s->residues[tmp], 2 * filter_order);
684 static int tak_decode_frame(AVCodecContext *avctx, void *data,
685 int *got_frame_ptr, AVPacket *pkt)
687 TAKDecContext *s = avctx->priv_data;
688 AVFrame *frame = data;
689 GetBitContext *gb = &s->gb;
690 int chan, i, ret, hsize;
692 if (pkt->size < TAK_MIN_FRAME_HEADER_BYTES)
693 return AVERROR_INVALIDDATA;
695 if ((ret = init_get_bits8(gb, pkt->data, pkt->size)) < 0)
698 if ((ret = ff_tak_decode_frame_header(avctx, gb, &s->ti, 0)) < 0)
701 if (avctx->err_recognition & AV_EF_CRCCHECK) {
702 hsize = get_bits_count(gb) / 8;
703 if (ff_tak_check_crc(pkt->data, hsize)) {
704 av_log(avctx, AV_LOG_ERROR, "CRC error\n");
705 return AVERROR_INVALIDDATA;
709 if (s->ti.codec != TAK_CODEC_MONO_STEREO &&
710 s->ti.codec != TAK_CODEC_MULTICHANNEL) {
711 av_log(avctx, AV_LOG_ERROR, "unsupported codec: %d\n", s->ti.codec);
712 return AVERROR_PATCHWELCOME;
714 if (s->ti.data_type) {
715 av_log(avctx, AV_LOG_ERROR,
716 "unsupported data type: %d\n", s->ti.data_type);
717 return AVERROR_INVALIDDATA;
719 if (s->ti.codec == TAK_CODEC_MONO_STEREO && s->ti.channels > 2) {
720 av_log(avctx, AV_LOG_ERROR,
721 "invalid number of channels: %d\n", s->ti.channels);
722 return AVERROR_INVALIDDATA;
724 if (s->ti.channels > 6) {
725 av_log(avctx, AV_LOG_ERROR,
726 "unsupported number of channels: %d\n", s->ti.channels);
727 return AVERROR_INVALIDDATA;
730 if (s->ti.frame_samples <= 0) {
731 av_log(avctx, AV_LOG_ERROR, "unsupported/invalid number of samples\n");
732 return AVERROR_INVALIDDATA;
735 if (s->ti.bps != avctx->bits_per_raw_sample) {
736 avctx->bits_per_raw_sample = s->ti.bps;
737 if ((ret = set_bps_params(avctx)) < 0)
740 if (s->ti.sample_rate != avctx->sample_rate) {
741 avctx->sample_rate = s->ti.sample_rate;
742 set_sample_rate_params(avctx);
745 avctx->channel_layout = s->ti.ch_layout;
746 avctx->channels = s->ti.channels;
748 s->nb_samples = s->ti.last_frame_samples ? s->ti.last_frame_samples
749 : s->ti.frame_samples;
751 frame->nb_samples = s->nb_samples;
752 if ((ret = ff_get_buffer(avctx, frame)) < 0)
755 if (avctx->bits_per_raw_sample <= 16) {
756 int buf_size = av_samples_get_buffer_size(NULL, avctx->channels,
758 AV_SAMPLE_FMT_S32P, 0);
759 av_fast_malloc(&s->decode_buffer, &s->decode_buffer_size, buf_size);
760 if (!s->decode_buffer)
761 return AVERROR(ENOMEM);
762 ret = av_samples_fill_arrays((uint8_t **)s->decoded, NULL,
763 s->decode_buffer, avctx->channels,
764 s->nb_samples, AV_SAMPLE_FMT_S32P, 0);
768 for (chan = 0; chan < avctx->channels; chan++)
769 s->decoded[chan] = (int32_t *)frame->extended_data[chan];
772 if (s->nb_samples < 16) {
773 for (chan = 0; chan < avctx->channels; chan++) {
774 int32_t *decoded = s->decoded[chan];
775 for (i = 0; i < s->nb_samples; i++)
776 decoded[i] = get_sbits(gb, avctx->bits_per_raw_sample);
779 if (s->ti.codec == TAK_CODEC_MONO_STEREO) {
780 for (chan = 0; chan < avctx->channels; chan++)
781 if (ret = decode_channel(s, chan))
784 if (avctx->channels == 2) {
785 s->nb_subframes = get_bits(gb, 1) + 1;
786 if (s->nb_subframes > 1) {
787 s->subframe_len[1] = get_bits(gb, 6);
790 s->dmode = get_bits(gb, 3);
791 if (ret = decorrelate(s, 0, 1, s->nb_samples - 1))
794 } else if (s->ti.codec == TAK_CODEC_MULTICHANNEL) {
798 chan = get_bits(gb, 4) + 1;
799 if (chan > avctx->channels)
800 return AVERROR_INVALIDDATA;
802 for (i = 0; i < chan; i++) {
803 int nbit = get_bits(gb, 4);
805 if (nbit >= avctx->channels)
806 return AVERROR_INVALIDDATA;
808 if (ch_mask & 1 << nbit)
809 return AVERROR_INVALIDDATA;
811 s->mcdparams[i].present = get_bits1(gb);
812 if (s->mcdparams[i].present) {
813 s->mcdparams[i].index = get_bits(gb, 2);
814 s->mcdparams[i].chan2 = get_bits(gb, 4);
815 if (s->mcdparams[i].index == 1) {
816 if ((nbit == s->mcdparams[i].chan2) ||
817 (ch_mask & 1 << s->mcdparams[i].chan2))
818 return AVERROR_INVALIDDATA;
820 ch_mask |= 1 << s->mcdparams[i].chan2;
821 } else if (!(ch_mask & 1 << s->mcdparams[i].chan2)) {
822 return AVERROR_INVALIDDATA;
825 s->mcdparams[i].chan1 = nbit;
827 ch_mask |= 1 << nbit;
830 chan = avctx->channels;
831 for (i = 0; i < chan; i++) {
832 s->mcdparams[i].present = 0;
833 s->mcdparams[i].chan1 = i;
837 for (i = 0; i < chan; i++) {
838 if (s->mcdparams[i].present && s->mcdparams[i].index == 1)
839 if (ret = decode_channel(s, s->mcdparams[i].chan2))
842 if (ret = decode_channel(s, s->mcdparams[i].chan1))
845 if (s->mcdparams[i].present) {
846 s->dmode = mc_dmodes[s->mcdparams[i].index];
847 if (ret = decorrelate(s,
848 s->mcdparams[i].chan2,
849 s->mcdparams[i].chan1,
856 for (chan = 0; chan < avctx->channels; chan++) {
857 int32_t *decoded = s->decoded[chan];
859 if (s->lpc_mode[chan])
860 decode_lpc(decoded, s->lpc_mode[chan], s->nb_samples);
862 if (s->sample_shift[chan] > 0)
863 for (i = 0; i < s->nb_samples; i++)
864 decoded[i] <<= s->sample_shift[chan];
870 if (get_bits_left(gb) < 0)
871 av_log(avctx, AV_LOG_DEBUG, "overread\n");
872 else if (get_bits_left(gb) > 0)
873 av_log(avctx, AV_LOG_DEBUG, "underread\n");
875 if (avctx->err_recognition & AV_EF_CRCCHECK) {
876 if (ff_tak_check_crc(pkt->data + hsize,
877 get_bits_count(gb) / 8 - hsize)) {
878 av_log(avctx, AV_LOG_ERROR, "CRC error\n");
879 return AVERROR_INVALIDDATA;
883 /* convert to output buffer */
884 switch (avctx->sample_fmt) {
885 case AV_SAMPLE_FMT_U8P:
886 for (chan = 0; chan < avctx->channels; chan++) {
887 uint8_t *samples = (uint8_t *)frame->extended_data[chan];
888 int32_t *decoded = s->decoded[chan];
889 for (i = 0; i < s->nb_samples; i++)
890 samples[i] = decoded[i] + 0x80;
893 case AV_SAMPLE_FMT_S16P:
894 for (chan = 0; chan < avctx->channels; chan++) {
895 int16_t *samples = (int16_t *)frame->extended_data[chan];
896 int32_t *decoded = s->decoded[chan];
897 for (i = 0; i < s->nb_samples; i++)
898 samples[i] = decoded[i];
901 case AV_SAMPLE_FMT_S32P:
902 for (chan = 0; chan < avctx->channels; chan++) {
903 int32_t *samples = (int32_t *)frame->extended_data[chan];
904 for (i = 0; i < s->nb_samples; i++)
915 static av_cold int tak_decode_close(AVCodecContext *avctx)
917 TAKDecContext *s = avctx->priv_data;
919 av_freep(&s->decode_buffer);
924 AVCodec ff_tak_decoder = {
926 .type = AVMEDIA_TYPE_AUDIO,
927 .id = AV_CODEC_ID_TAK,
928 .priv_data_size = sizeof(TAKDecContext),
929 .init = tak_decode_init,
930 .close = tak_decode_close,
931 .decode = tak_decode_frame,
932 .capabilities = CODEC_CAP_DR1,
933 .long_name = NULL_IF_CONFIG_SMALL("TAK (Tom's lossless Audio Kompressor)"),
934 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_U8P,
937 AV_SAMPLE_FMT_NONE },