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Imported Debian version 2.5.0~trusty1.1
[deb_ffmpeg.git] / ffmpeg / 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/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
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
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
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
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
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
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
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
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, 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 int 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 s->filter[j] = x - ((tfilter[i] + y) >> (15 - filter_quant));
452 s->filter[i] = x - ((tfilter[j] + y) >> (15 - filter_quant));
453 }
454
455 if ((ret = decode_residues(s, &decoded[filter_order],
456 subframe_size - filter_order)) < 0)
457 return ret;
458
459 for (i = 0; i < filter_order; i++)
460 s->residues[i] = *decoded++ >> dshift;
461
462 y = FF_ARRAY_ELEMS(s->residues) - filter_order;
463 x = subframe_size - filter_order;
464 while (x > 0) {
465 int tmp = FFMIN(y, x);
466
467 for (i = 0; i < tmp; i++) {
468 int v = 1 << (filter_quant - 1);
469
470 if (filter_order & -16)
471 v += s->adsp.scalarproduct_int16(&s->residues[i], s->filter,
472 filter_order & -16);
473 for (j = filter_order & -16; j < filter_order; j += 4) {
474 v += s->residues[i + j + 3] * s->filter[j + 3] +
475 s->residues[i + j + 2] * s->filter[j + 2] +
476 s->residues[i + j + 1] * s->filter[j + 1] +
477 s->residues[i + j ] * s->filter[j ];
478 }
479 v = (av_clip(v >> filter_quant, -8192, 8191) << dshift) - *decoded;
480 *decoded++ = v;
481 s->residues[filter_order + i] = v >> dshift;
482 }
483
484 x -= tmp;
485 if (x > 0)
486 memcpy(s->residues, &s->residues[y], 2 * filter_order);
487 }
488
489 emms_c();
490
491 return 0;
492 }
493
494 static int decode_channel(TAKDecContext *s, int chan)
495 {
496 AVCodecContext *avctx = s->avctx;
497 GetBitContext *gb = &s->gb;
498 int32_t *decoded = s->decoded[chan];
499 int left = s->nb_samples - 1;
500 int i = 0, ret, prev = 0;
501
502 s->sample_shift[chan] = get_bits_esc4(gb);
503 if (s->sample_shift[chan] >= avctx->bits_per_raw_sample)
504 return AVERROR_INVALIDDATA;
505
506 *decoded++ = get_sbits(gb, avctx->bits_per_raw_sample - s->sample_shift[chan]);
507 s->lpc_mode[chan] = get_bits(gb, 2);
508 s->nb_subframes = get_bits(gb, 3) + 1;
509
510 if (s->nb_subframes > 1) {
511 if (get_bits_left(gb) < (s->nb_subframes - 1) * 6)
512 return AVERROR_INVALIDDATA;
513
514 for (; i < s->nb_subframes - 1; i++) {
515 int v = get_bits(gb, 6);
516
517 s->subframe_len[i] = (v - prev) * s->subframe_scale;
518 if (s->subframe_len[i] <= 0)
519 return AVERROR_INVALIDDATA;
520
521 left -= s->subframe_len[i];
522 prev = v;
523 }
524
525 if (left <= 0)
526 return AVERROR_INVALIDDATA;
527 }
528 s->subframe_len[i] = left;
529
530 prev = 0;
531 for (i = 0; i < s->nb_subframes; i++) {
532 if ((ret = decode_subframe(s, decoded, s->subframe_len[i], prev)) < 0)
533 return ret;
534 decoded += s->subframe_len[i];
535 prev = s->subframe_len[i];
536 }
537
538 return 0;
539 }
540
541 static int decorrelate(TAKDecContext *s, int c1, int c2, int length)
542 {
543 GetBitContext *gb = &s->gb;
544 int32_t *p1 = s->decoded[c1] + 1;
545 int32_t *p2 = s->decoded[c2] + 1;
546 int i;
547 int dshift, dfactor;
548
549 switch (s->dmode) {
550 case 1: /* left/side */
551 for (i = 0; i < length; i++) {
552 int32_t a = p1[i];
553 int32_t b = p2[i];
554 p2[i] = a + b;
555 }
556 break;
557 case 2: /* side/right */
558 for (i = 0; i < length; i++) {
559 int32_t a = p1[i];
560 int32_t b = p2[i];
561 p1[i] = b - a;
562 }
563 break;
564 case 3: /* side/mid */
565 for (i = 0; i < length; i++) {
566 int32_t a = p1[i];
567 int32_t b = p2[i];
568 a -= b >> 1;
569 p1[i] = a;
570 p2[i] = a + b;
571 }
572 break;
573 case 4: /* side/left with scale factor */
574 FFSWAP(int32_t*, p1, p2);
575 case 5: /* side/right with scale factor */
576 dshift = get_bits_esc4(gb);
577 dfactor = get_sbits(gb, 10);
578 for (i = 0; i < length; i++) {
579 int32_t a = p1[i];
580 int32_t b = p2[i];
581 b = dfactor * (b >> dshift) + 128 >> 8 << dshift;
582 p1[i] = b - a;
583 }
584 break;
585 case 6:
586 FFSWAP(int32_t*, p1, p2);
587 case 7: {
588 int length2, order_half, filter_order, dval1, dval2;
589 int tmp, x, code_size;
590
591 if (length < 256)
592 return AVERROR_INVALIDDATA;
593
594 dshift = get_bits_esc4(gb);
595 filter_order = 8 << get_bits1(gb);
596 dval1 = get_bits1(gb);
597 dval2 = get_bits1(gb);
598
599 for (i = 0; i < filter_order; i++) {
600 if (!(i & 3))
601 code_size = 14 - get_bits(gb, 3);
602 s->filter[i] = get_sbits(gb, code_size);
603 }
604
605 order_half = filter_order / 2;
606 length2 = length - (filter_order - 1);
607
608 /* decorrelate beginning samples */
609 if (dval1) {
610 for (i = 0; i < order_half; i++) {
611 int32_t a = p1[i];
612 int32_t b = p2[i];
613 p1[i] = a + b;
614 }
615 }
616
617 /* decorrelate ending samples */
618 if (dval2) {
619 for (i = length2 + order_half; i < length; i++) {
620 int32_t a = p1[i];
621 int32_t b = p2[i];
622 p1[i] = a + b;
623 }
624 }
625
626
627 for (i = 0; i < filter_order; i++)
628 s->residues[i] = *p2++ >> dshift;
629
630 p1 += order_half;
631 x = FF_ARRAY_ELEMS(s->residues) - filter_order;
632 for (; length2 > 0; length2 -= tmp) {
633 tmp = FFMIN(length2, x);
634
635 for (i = 0; i < tmp; i++)
636 s->residues[filter_order + i] = *p2++ >> dshift;
637
638 for (i = 0; i < tmp; i++) {
639 int v = 1 << 9;
640
641 if (filter_order == 16) {
642 v += s->adsp.scalarproduct_int16(&s->residues[i], s->filter,
643 filter_order);
644 } else {
645 v += s->residues[i + 7] * s->filter[7] +
646 s->residues[i + 6] * s->filter[6] +
647 s->residues[i + 5] * s->filter[5] +
648 s->residues[i + 4] * s->filter[4] +
649 s->residues[i + 3] * s->filter[3] +
650 s->residues[i + 2] * s->filter[2] +
651 s->residues[i + 1] * s->filter[1] +
652 s->residues[i ] * s->filter[0];
653 }
654
655 v = (av_clip(v >> 10, -8192, 8191) << dshift) - *p1;
656 *p1++ = v;
657 }
658
659 memcpy(s->residues, &s->residues[tmp], 2 * filter_order);
660 }
661
662 emms_c();
663 break;
664 }
665 }
666
667 return 0;
668 }
669
670 static int tak_decode_frame(AVCodecContext *avctx, void *data,
671 int *got_frame_ptr, AVPacket *pkt)
672 {
673 TAKDecContext *s = avctx->priv_data;
674 AVFrame *frame = data;
675 ThreadFrame tframe = { .f = data };
676 GetBitContext *gb = &s->gb;
677 int chan, i, ret, hsize;
678
679 if (pkt->size < TAK_MIN_FRAME_HEADER_BYTES)
680 return AVERROR_INVALIDDATA;
681
682 if ((ret = init_get_bits8(gb, pkt->data, pkt->size)) < 0)
683 return ret;
684
685 if ((ret = ff_tak_decode_frame_header(avctx, gb, &s->ti, 0)) < 0)
686 return ret;
687
688 hsize = get_bits_count(gb) / 8;
689 if (avctx->err_recognition & (AV_EF_CRCCHECK|AV_EF_COMPLIANT)) {
690 if (ff_tak_check_crc(pkt->data, hsize)) {
691 av_log(avctx, AV_LOG_ERROR, "CRC error\n");
692 if (avctx->err_recognition & AV_EF_EXPLODE)
693 return AVERROR_INVALIDDATA;
694 }
695 }
696
697 if (s->ti.codec != TAK_CODEC_MONO_STEREO &&
698 s->ti.codec != TAK_CODEC_MULTICHANNEL) {
699 av_log(avctx, AV_LOG_ERROR, "unsupported codec: %d\n", s->ti.codec);
700 return AVERROR_PATCHWELCOME;
701 }
702 if (s->ti.data_type) {
703 av_log(avctx, AV_LOG_ERROR,
704 "unsupported data type: %d\n", s->ti.data_type);
705 return AVERROR_INVALIDDATA;
706 }
707 if (s->ti.codec == TAK_CODEC_MONO_STEREO && s->ti.channels > 2) {
708 av_log(avctx, AV_LOG_ERROR,
709 "invalid number of channels: %d\n", s->ti.channels);
710 return AVERROR_INVALIDDATA;
711 }
712 if (s->ti.channels > 6) {
713 av_log(avctx, AV_LOG_ERROR,
714 "unsupported number of channels: %d\n", s->ti.channels);
715 return AVERROR_INVALIDDATA;
716 }
717
718 if (s->ti.frame_samples <= 0) {
719 av_log(avctx, AV_LOG_ERROR, "unsupported/invalid number of samples\n");
720 return AVERROR_INVALIDDATA;
721 }
722
723 avctx->bits_per_raw_sample = s->ti.bps;
724 if ((ret = set_bps_params(avctx)) < 0)
725 return ret;
726 if (s->ti.sample_rate != avctx->sample_rate) {
727 avctx->sample_rate = s->ti.sample_rate;
728 set_sample_rate_params(avctx);
729 }
730 if (s->ti.ch_layout)
731 avctx->channel_layout = s->ti.ch_layout;
732 avctx->channels = s->ti.channels;
733
734 s->nb_samples = s->ti.last_frame_samples ? s->ti.last_frame_samples
735 : s->ti.frame_samples;
736
737 frame->nb_samples = s->nb_samples;
738 if ((ret = ff_thread_get_buffer(avctx, &tframe, 0)) < 0)
739 return ret;
740 ff_thread_finish_setup(avctx);
741
742 if (avctx->bits_per_raw_sample <= 16) {
743 int buf_size = av_samples_get_buffer_size(NULL, avctx->channels,
744 s->nb_samples,
745 AV_SAMPLE_FMT_S32P, 0);
746 av_fast_malloc(&s->decode_buffer, &s->decode_buffer_size, buf_size);
747 if (!s->decode_buffer)
748 return AVERROR(ENOMEM);
749 ret = av_samples_fill_arrays((uint8_t **)s->decoded, NULL,
750 s->decode_buffer, avctx->channels,
751 s->nb_samples, AV_SAMPLE_FMT_S32P, 0);
752 if (ret < 0)
753 return ret;
754 } else {
755 for (chan = 0; chan < avctx->channels; chan++)
756 s->decoded[chan] = (int32_t *)frame->extended_data[chan];
757 }
758
759 if (s->nb_samples < 16) {
760 for (chan = 0; chan < avctx->channels; chan++) {
761 int32_t *decoded = s->decoded[chan];
762 for (i = 0; i < s->nb_samples; i++)
763 decoded[i] = get_sbits(gb, avctx->bits_per_raw_sample);
764 }
765 } else {
766 if (s->ti.codec == TAK_CODEC_MONO_STEREO) {
767 for (chan = 0; chan < avctx->channels; chan++)
768 if (ret = decode_channel(s, chan))
769 return ret;
770
771 if (avctx->channels == 2) {
772 s->nb_subframes = get_bits(gb, 1) + 1;
773 if (s->nb_subframes > 1) {
774 s->subframe_len[1] = get_bits(gb, 6);
775 }
776
777 s->dmode = get_bits(gb, 3);
778 if (ret = decorrelate(s, 0, 1, s->nb_samples - 1))
779 return ret;
780 }
781 } else if (s->ti.codec == TAK_CODEC_MULTICHANNEL) {
782 if (get_bits1(gb)) {
783 int ch_mask = 0;
784
785 chan = get_bits(gb, 4) + 1;
786 if (chan > avctx->channels)
787 return AVERROR_INVALIDDATA;
788
789 for (i = 0; i < chan; i++) {
790 int nbit = get_bits(gb, 4);
791
792 if (nbit >= avctx->channels)
793 return AVERROR_INVALIDDATA;
794
795 if (ch_mask & 1 << nbit)
796 return AVERROR_INVALIDDATA;
797
798 s->mcdparams[i].present = get_bits1(gb);
799 if (s->mcdparams[i].present) {
800 s->mcdparams[i].index = get_bits(gb, 2);
801 s->mcdparams[i].chan2 = get_bits(gb, 4);
802 if (s->mcdparams[i].index == 1) {
803 if ((nbit == s->mcdparams[i].chan2) ||
804 (ch_mask & 1 << s->mcdparams[i].chan2))
805 return AVERROR_INVALIDDATA;
806
807 ch_mask |= 1 << s->mcdparams[i].chan2;
808 } else if (!(ch_mask & 1 << s->mcdparams[i].chan2)) {
809 return AVERROR_INVALIDDATA;
810 }
811 }
812 s->mcdparams[i].chan1 = nbit;
813
814 ch_mask |= 1 << nbit;
815 }
816 } else {
817 chan = avctx->channels;
818 for (i = 0; i < chan; i++) {
819 s->mcdparams[i].present = 0;
820 s->mcdparams[i].chan1 = i;
821 }
822 }
823
824 for (i = 0; i < chan; i++) {
825 if (s->mcdparams[i].present && s->mcdparams[i].index == 1)
826 if (ret = decode_channel(s, s->mcdparams[i].chan2))
827 return ret;
828
829 if (ret = decode_channel(s, s->mcdparams[i].chan1))
830 return ret;
831
832 if (s->mcdparams[i].present) {
833 s->dmode = mc_dmodes[s->mcdparams[i].index];
834 if (ret = decorrelate(s,
835 s->mcdparams[i].chan2,
836 s->mcdparams[i].chan1,
837 s->nb_samples - 1))
838 return ret;
839 }
840 }
841 }
842
843 for (chan = 0; chan < avctx->channels; chan++) {
844 int32_t *decoded = s->decoded[chan];
845
846 if (s->lpc_mode[chan])
847 decode_lpc(decoded, s->lpc_mode[chan], s->nb_samples);
848
849 if (s->sample_shift[chan] > 0)
850 for (i = 0; i < s->nb_samples; i++)
851 decoded[i] <<= s->sample_shift[chan];
852 }
853 }
854
855 align_get_bits(gb);
856 skip_bits(gb, 24);
857 if (get_bits_left(gb) < 0)
858 av_log(avctx, AV_LOG_DEBUG, "overread\n");
859 else if (get_bits_left(gb) > 0)
860 av_log(avctx, AV_LOG_DEBUG, "underread\n");
861
862 if (avctx->err_recognition & (AV_EF_CRCCHECK | AV_EF_COMPLIANT)) {
863 if (ff_tak_check_crc(pkt->data + hsize,
864 get_bits_count(gb) / 8 - hsize)) {
865 av_log(avctx, AV_LOG_ERROR, "CRC error\n");
866 if (avctx->err_recognition & AV_EF_EXPLODE)
867 return AVERROR_INVALIDDATA;
868 }
869 }
870
871 /* convert to output buffer */
872 switch (avctx->sample_fmt) {
873 case AV_SAMPLE_FMT_U8P:
874 for (chan = 0; chan < avctx->channels; chan++) {
875 uint8_t *samples = (uint8_t *)frame->extended_data[chan];
876 int32_t *decoded = s->decoded[chan];
877 for (i = 0; i < s->nb_samples; i++)
878 samples[i] = decoded[i] + 0x80;
879 }
880 break;
881 case AV_SAMPLE_FMT_S16P:
882 for (chan = 0; chan < avctx->channels; chan++) {
883 int16_t *samples = (int16_t *)frame->extended_data[chan];
884 int32_t *decoded = s->decoded[chan];
885 for (i = 0; i < s->nb_samples; i++)
886 samples[i] = decoded[i];
887 }
888 break;
889 case AV_SAMPLE_FMT_S32P:
890 for (chan = 0; chan < avctx->channels; chan++) {
891 int32_t *samples = (int32_t *)frame->extended_data[chan];
892 for (i = 0; i < s->nb_samples; i++)
893 samples[i] <<= 8;
894 }
895 break;
896 }
897
898 *got_frame_ptr = 1;
899
900 return pkt->size;
901 }
902
903 static int init_thread_copy(AVCodecContext *avctx)
904 {
905 TAKDecContext *s = avctx->priv_data;
906 s->avctx = avctx;
907 return 0;
908 }
909
910 static int update_thread_context(AVCodecContext *dst,
911 const AVCodecContext *src)
912 {
913 TAKDecContext *tsrc = src->priv_data;
914 TAKDecContext *tdst = dst->priv_data;
915
916 if (dst == src)
917 return 0;
918 memcpy(&tdst->ti, &tsrc->ti, sizeof(TAKStreamInfo));
919 return 0;
920 }
921
922 static av_cold int tak_decode_close(AVCodecContext *avctx)
923 {
924 TAKDecContext *s = avctx->priv_data;
925
926 av_freep(&s->decode_buffer);
927
928 return 0;
929 }
930
931 AVCodec ff_tak_decoder = {
932 .name = "tak",
933 .long_name = NULL_IF_CONFIG_SMALL("TAK (Tom's lossless Audio Kompressor)"),
934 .type = AVMEDIA_TYPE_AUDIO,
935 .id = AV_CODEC_ID_TAK,
936 .priv_data_size = sizeof(TAKDecContext),
937 .init = tak_decode_init,
938 .close = tak_decode_close,
939 .decode = tak_decode_frame,
940 .init_thread_copy = ONLY_IF_THREADS_ENABLED(init_thread_copy),
941 .update_thread_context = ONLY_IF_THREADS_ENABLED(update_thread_context),
942 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS,
943 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_U8P,
944 AV_SAMPLE_FMT_S16P,
945 AV_SAMPLE_FMT_S32P,
946 AV_SAMPLE_FMT_NONE },
947 };
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