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
40 typedef 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
47 typedef 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
75 static const int8_t mc_dmodes[] = { 1, 3, 4, 6, };
76
77 static const uint16_t predictor_sizes[] = {
78 4, 8, 12, 16, 24, 32, 48, 64, 80, 96, 128, 160, 192, 224, 256, 0,
79 };
80
81 static 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
set_bps_params(AVCodecContext * avctx)140 static 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
set_sample_rate_params(AVCodecContext * avctx)161 static 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
tak_decode_init(AVCodecContext * avctx)170 static 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
decode_lpc(int32_t * coeffs,int mode,int length)184 static 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
decode_segment(TAKDecContext * s,int8_t mode,int32_t * decoded,int len)239 static 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
decode_residues(TAKDecContext * s,int32_t * decoded,int length)283 static 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
get_bits_esc4(GetBitContext * gb)362 static 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
decode_subframe(TAKDecContext * s,int32_t * decoded,int subframe_size,int prev_subframe_size)370 static int decode_subframe(TAKDecContext *s, int32_t *decoded,
371 int subframe_size, int prev_subframe_size)
372 {
373 GetBitContext *gb = &s->gb;
374 int x= 0;
375 int y, i, j, ret = 0;
376 int dshift, size, filter_quant, filter_order;
377 int tfilter[MAX_PREDICTORS];
378
379 if (!get_bits1(gb))
380 return decode_residues(s, decoded, subframe_size);
381
382 filter_order = predictor_sizes[get_bits(gb, 4)];
383
384 if (prev_subframe_size > 0 && get_bits1(gb)) {
385 if (filter_order > prev_subframe_size)
386 return AVERROR_INVALIDDATA;
387
388 decoded -= filter_order;
389 subframe_size += filter_order;
390
391 if (filter_order > subframe_size)
392 return AVERROR_INVALIDDATA;
393 } else {
394 int lpc_mode;
395
396 if (filter_order > subframe_size)
397 return AVERROR_INVALIDDATA;
398
399 lpc_mode = get_bits(gb, 2);
400 if (lpc_mode > 2)
401 return AVERROR_INVALIDDATA;
402
403 if ((ret = decode_residues(s, decoded, filter_order)) < 0)
404 return ret;
405
406 if (lpc_mode)
407 decode_lpc(decoded, lpc_mode, filter_order);
408 }
409
410 dshift = get_bits_esc4(gb);
411 size = get_bits1(gb) + 6;
412
413 filter_quant = 10;
414 if (get_bits1(gb)) {
415 filter_quant -= get_bits(gb, 3) + 1;
416 if (filter_quant < 3)
417 return AVERROR_INVALIDDATA;
418 }
419
420 s->predictors[0] = get_sbits(gb, 10);
421 s->predictors[1] = get_sbits(gb, 10);
422 s->predictors[2] = get_sbits(gb, size) << (10 - size);
423 s->predictors[3] = get_sbits(gb, size) << (10 - size);
424 if (filter_order > 4) {
425 int tmp = size - get_bits1(gb);
426
427 for (i = 4; i < filter_order; i++) {
428 if (!(i & 3))
429 x = tmp - get_bits(gb, 2);
430 s->predictors[i] = get_sbits(gb, x) << (10 - size);
431 }
432 }
433
434 tfilter[0] = s->predictors[0] << 6;
435 for (i = 1; i < filter_order; i++) {
436 int32_t *p1 = &tfilter[0];
437 int32_t *p2 = &tfilter[i - 1];
438
439 for (j = 0; j < (i + 1) / 2; j++) {
440 x = *p1 + (s->predictors[i] * *p2 + 256 >> 9);
441 *p2 += s->predictors[i] * *p1 + 256 >> 9;
442 *p1++ = x;
443 p2--;
444 }
445
446 tfilter[i] = s->predictors[i] << 6;
447 }
448
449 x = 1 << (32 - (15 - filter_quant));
450 y = 1 << ((15 - filter_quant) - 1);
451 for (i = 0, j = filter_order - 1; i < filter_order / 2; i++, 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 int 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
decode_channel(TAKDecContext * s,int chan)495 static 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
decorrelate(TAKDecContext * s,int c1,int c2,int length)542 static 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;
591 int code_size = 0;
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; 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(v >> 10, -8192, 8191) << dshift) - *p1;
658 *p1++ = v;
659 }
660
661 memcpy(s->residues, &s->residues[tmp], 2 * filter_order);
662 }
663
664 emms_c();
665 break;
666 }
667 }
668
669 return 0;
670 }
671
tak_decode_frame(AVCodecContext * avctx,void * data,int * got_frame_ptr,AVPacket * pkt)672 static int tak_decode_frame(AVCodecContext *avctx, void *data,
673 int *got_frame_ptr, AVPacket *pkt)
674 {
675 TAKDecContext *s = avctx->priv_data;
676 AVFrame *frame = data;
677 ThreadFrame tframe = { .f = data };
678 GetBitContext *gb = &s->gb;
679 int chan, i, ret, hsize;
680
681 if (pkt->size < TAK_MIN_FRAME_HEADER_BYTES)
682 return AVERROR_INVALIDDATA;
683
684 if ((ret = init_get_bits8(gb, pkt->data, pkt->size)) < 0)
685 return ret;
686
687 if ((ret = ff_tak_decode_frame_header(avctx, gb, &s->ti, 0)) < 0)
688 return ret;
689
690 hsize = get_bits_count(gb) / 8;
691 if (avctx->err_recognition & (AV_EF_CRCCHECK|AV_EF_COMPLIANT)) {
692 if (ff_tak_check_crc(pkt->data, hsize)) {
693 av_log(avctx, AV_LOG_ERROR, "CRC error\n");
694 if (avctx->err_recognition & AV_EF_EXPLODE)
695 return AVERROR_INVALIDDATA;
696 }
697 }
698
699 if (s->ti.codec != TAK_CODEC_MONO_STEREO &&
700 s->ti.codec != TAK_CODEC_MULTICHANNEL) {
701 av_log(avctx, AV_LOG_ERROR, "unsupported codec: %d\n", s->ti.codec);
702 return AVERROR_PATCHWELCOME;
703 }
704 if (s->ti.data_type) {
705 av_log(avctx, AV_LOG_ERROR,
706 "unsupported data type: %d\n", s->ti.data_type);
707 return AVERROR_INVALIDDATA;
708 }
709 if (s->ti.codec == TAK_CODEC_MONO_STEREO && s->ti.channels > 2) {
710 av_log(avctx, AV_LOG_ERROR,
711 "invalid number of channels: %d\n", s->ti.channels);
712 return AVERROR_INVALIDDATA;
713 }
714 if (s->ti.channels > 6) {
715 av_log(avctx, AV_LOG_ERROR,
716 "unsupported number of channels: %d\n", s->ti.channels);
717 return AVERROR_INVALIDDATA;
718 }
719
720 if (s->ti.frame_samples <= 0) {
721 av_log(avctx, AV_LOG_ERROR, "unsupported/invalid number of samples\n");
722 return AVERROR_INVALIDDATA;
723 }
724
725 avctx->bits_per_raw_sample = s->ti.bps;
726 if ((ret = set_bps_params(avctx)) < 0)
727 return ret;
728 if (s->ti.sample_rate != avctx->sample_rate) {
729 avctx->sample_rate = s->ti.sample_rate;
730 set_sample_rate_params(avctx);
731 }
732 if (s->ti.ch_layout)
733 avctx->channel_layout = s->ti.ch_layout;
734 avctx->channels = s->ti.channels;
735
736 s->nb_samples = s->ti.last_frame_samples ? s->ti.last_frame_samples
737 : s->ti.frame_samples;
738
739 frame->nb_samples = s->nb_samples;
740 if ((ret = ff_thread_get_buffer(avctx, &tframe, 0)) < 0)
741 return ret;
742 ff_thread_finish_setup(avctx);
743
744 if (avctx->bits_per_raw_sample <= 16) {
745 int buf_size = av_samples_get_buffer_size(NULL, avctx->channels,
746 s->nb_samples,
747 AV_SAMPLE_FMT_S32P, 0);
748 av_fast_malloc(&s->decode_buffer, &s->decode_buffer_size, buf_size);
749 if (!s->decode_buffer)
750 return AVERROR(ENOMEM);
751 ret = av_samples_fill_arrays((uint8_t **)s->decoded, NULL,
752 s->decode_buffer, avctx->channels,
753 s->nb_samples, AV_SAMPLE_FMT_S32P, 0);
754 if (ret < 0)
755 return ret;
756 } else {
757 for (chan = 0; chan < avctx->channels; chan++)
758 s->decoded[chan] = (int32_t *)frame->extended_data[chan];
759 }
760
761 if (s->nb_samples < 16) {
762 for (chan = 0; chan < avctx->channels; chan++) {
763 int32_t *decoded = s->decoded[chan];
764 for (i = 0; i < s->nb_samples; i++)
765 decoded[i] = get_sbits(gb, avctx->bits_per_raw_sample);
766 }
767 } else {
768 if (s->ti.codec == TAK_CODEC_MONO_STEREO) {
769 for (chan = 0; chan < avctx->channels; chan++)
770 if (ret = decode_channel(s, chan))
771 return ret;
772
773 if (avctx->channels == 2) {
774 s->nb_subframes = get_bits(gb, 1) + 1;
775 if (s->nb_subframes > 1) {
776 s->subframe_len[1] = get_bits(gb, 6);
777 }
778
779 s->dmode = get_bits(gb, 3);
780 if (ret = decorrelate(s, 0, 1, s->nb_samples - 1))
781 return ret;
782 }
783 } else if (s->ti.codec == TAK_CODEC_MULTICHANNEL) {
784 if (get_bits1(gb)) {
785 int ch_mask = 0;
786
787 chan = get_bits(gb, 4) + 1;
788 if (chan > avctx->channels)
789 return AVERROR_INVALIDDATA;
790
791 for (i = 0; i < chan; i++) {
792 int nbit = get_bits(gb, 4);
793
794 if (nbit >= avctx->channels)
795 return AVERROR_INVALIDDATA;
796
797 if (ch_mask & 1 << nbit)
798 return AVERROR_INVALIDDATA;
799
800 s->mcdparams[i].present = get_bits1(gb);
801 if (s->mcdparams[i].present) {
802 s->mcdparams[i].index = get_bits(gb, 2);
803 s->mcdparams[i].chan2 = get_bits(gb, 4);
804 if (s->mcdparams[i].index == 1) {
805 if ((nbit == s->mcdparams[i].chan2) ||
806 (ch_mask & 1 << s->mcdparams[i].chan2))
807 return AVERROR_INVALIDDATA;
808
809 ch_mask |= 1 << s->mcdparams[i].chan2;
810 } else if (!(ch_mask & 1 << s->mcdparams[i].chan2)) {
811 return AVERROR_INVALIDDATA;
812 }
813 }
814 s->mcdparams[i].chan1 = nbit;
815
816 ch_mask |= 1 << nbit;
817 }
818 } else {
819 chan = avctx->channels;
820 for (i = 0; i < chan; i++) {
821 s->mcdparams[i].present = 0;
822 s->mcdparams[i].chan1 = i;
823 }
824 }
825
826 for (i = 0; i < chan; i++) {
827 if (s->mcdparams[i].present && s->mcdparams[i].index == 1)
828 if (ret = decode_channel(s, s->mcdparams[i].chan2))
829 return ret;
830
831 if (ret = decode_channel(s, s->mcdparams[i].chan1))
832 return ret;
833
834 if (s->mcdparams[i].present) {
835 s->dmode = mc_dmodes[s->mcdparams[i].index];
836 if (ret = decorrelate(s,
837 s->mcdparams[i].chan2,
838 s->mcdparams[i].chan1,
839 s->nb_samples - 1))
840 return ret;
841 }
842 }
843 }
844
845 for (chan = 0; chan < avctx->channels; chan++) {
846 int32_t *decoded = s->decoded[chan];
847
848 if (s->lpc_mode[chan])
849 decode_lpc(decoded, s->lpc_mode[chan], s->nb_samples);
850
851 if (s->sample_shift[chan] > 0)
852 for (i = 0; i < s->nb_samples; i++)
853 decoded[i] <<= s->sample_shift[chan];
854 }
855 }
856
857 align_get_bits(gb);
858 skip_bits(gb, 24);
859 if (get_bits_left(gb) < 0)
860 av_log(avctx, AV_LOG_DEBUG, "overread\n");
861 else if (get_bits_left(gb) > 0)
862 av_log(avctx, AV_LOG_DEBUG, "underread\n");
863
864 if (avctx->err_recognition & (AV_EF_CRCCHECK | AV_EF_COMPLIANT)) {
865 if (ff_tak_check_crc(pkt->data + hsize,
866 get_bits_count(gb) / 8 - hsize)) {
867 av_log(avctx, AV_LOG_ERROR, "CRC error\n");
868 if (avctx->err_recognition & AV_EF_EXPLODE)
869 return AVERROR_INVALIDDATA;
870 }
871 }
872
873 /* convert to output buffer */
874 switch (avctx->sample_fmt) {
875 case AV_SAMPLE_FMT_U8P:
876 for (chan = 0; chan < avctx->channels; chan++) {
877 uint8_t *samples = (uint8_t *)frame->extended_data[chan];
878 int32_t *decoded = s->decoded[chan];
879 for (i = 0; i < s->nb_samples; i++)
880 samples[i] = decoded[i] + 0x80;
881 }
882 break;
883 case AV_SAMPLE_FMT_S16P:
884 for (chan = 0; chan < avctx->channels; chan++) {
885 int16_t *samples = (int16_t *)frame->extended_data[chan];
886 int32_t *decoded = s->decoded[chan];
887 for (i = 0; i < s->nb_samples; i++)
888 samples[i] = decoded[i];
889 }
890 break;
891 case AV_SAMPLE_FMT_S32P:
892 for (chan = 0; chan < avctx->channels; chan++) {
893 int32_t *samples = (int32_t *)frame->extended_data[chan];
894 for (i = 0; i < s->nb_samples; i++)
895 samples[i] <<= 8;
896 }
897 break;
898 }
899
900 *got_frame_ptr = 1;
901
902 return pkt->size;
903 }
904
init_thread_copy(AVCodecContext * avctx)905 static int init_thread_copy(AVCodecContext *avctx)
906 {
907 TAKDecContext *s = avctx->priv_data;
908 s->avctx = avctx;
909 return 0;
910 }
911
update_thread_context(AVCodecContext * dst,const AVCodecContext * src)912 static int update_thread_context(AVCodecContext *dst,
913 const AVCodecContext *src)
914 {
915 TAKDecContext *tsrc = src->priv_data;
916 TAKDecContext *tdst = dst->priv_data;
917
918 if (dst == src)
919 return 0;
920 memcpy(&tdst->ti, &tsrc->ti, sizeof(TAKStreamInfo));
921 return 0;
922 }
923
tak_decode_close(AVCodecContext * avctx)924 static av_cold int tak_decode_close(AVCodecContext *avctx)
925 {
926 TAKDecContext *s = avctx->priv_data;
927
928 av_freep(&s->decode_buffer);
929
930 return 0;
931 }
932
933 AVCodec ff_tak_decoder = {
934 .name = "tak",
935 .long_name = NULL_IF_CONFIG_SMALL("TAK (Tom's lossless Audio Kompressor)"),
936 .type = AVMEDIA_TYPE_AUDIO,
937 .id = AV_CODEC_ID_TAK,
938 .priv_data_size = sizeof(TAKDecContext),
939 .init = tak_decode_init,
940 .close = tak_decode_close,
941 .decode = tak_decode_frame,
942 .init_thread_copy = ONLY_IF_THREADS_ENABLED(init_thread_copy),
943 .update_thread_context = ONLY_IF_THREADS_ENABLED(update_thread_context),
944 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS,
945 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_U8P,
946 AV_SAMPLE_FMT_S16P,
947 AV_SAMPLE_FMT_S32P,
948 AV_SAMPLE_FMT_NONE },
949 };
950