FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/takdec.c
Date: 2026-01-16 07:34:38
Exec Total Coverage
Lines: 352 525 67.0%
Functions: 12 13 92.3%
Branches: 181 329 55.0%
Line Branch Exec Source
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 41 static int set_bps_params(AVCodecContext *avctx)
148 {
149
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 41 switch (avctx->bits_per_raw_sample) {
150 ✗ case 8:
151 ✗ avctx->sample_fmt = AV_SAMPLE_FMT_U8P;
152 ✗ break;
153 41 case 16:
154 41 avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
155 41 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 41 return 0;
166 }
167
168 2 static void set_sample_rate_params(AVCodecContext *avctx)
169 {
170 2 TAKDecContext *s = avctx->priv_data;
171 int shift;
172
173
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 2 if (avctx->sample_rate < 11025) {
174 ✗ shift = 3;
175
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 2 } else if (avctx->sample_rate < 22050) {
176 ✗ shift = 2;
177
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 2 } else if (avctx->sample_rate < 44100) {
178 ✗ shift = 1;
179 } else {
180 2 shift = 0;
181 }
182 2 s->uval = FFALIGN(avctx->sample_rate + 511LL >> 9, 4) << shift;
183 2 s->subframe_scale = FFALIGN(avctx->sample_rate + 511LL >> 9, 4) << 1;
184 2 }
185
186 2 static av_cold int tak_decode_init(AVCodecContext *avctx)
187 {
188 2 TAKDecContext *s = avctx->priv_data;
189
190 2 ff_audiodsp_init(&s->adsp);
191 2 ff_takdsp_init(&s->tdsp);
192
193 2 s->avctx = avctx;
194 2 avctx->bits_per_raw_sample = avctx->bits_per_coded_sample;
195
196 2 set_sample_rate_params(avctx);
197
198 2 return set_bps_params(avctx);
199 }
200
201 124 static void decode_lpc(int32_t *coeffs, int mode, int length)
202 {
203 int i;
204
205
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 124 if (length < 2)
206 ✗ return;
207
208
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 124 if (mode == 1) {
209 117 unsigned a1 = *coeffs++;
210
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 431176 for (i = 0; i < length - 1 >> 1; i++) {
211 431059 *coeffs += a1;
212 431059 coeffs[1] += (unsigned)*coeffs;
213 431059 a1 = coeffs[1];
214 431059 coeffs += 2;
215 }
216
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 117 if (length - 1 & 1)
217 39 *coeffs += a1;
218
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 7 } else if (mode == 2) {
219 7 unsigned a1 = coeffs[1];
220 7 unsigned a2 = a1 + *coeffs;
221 7 coeffs[1] = a2;
222
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 7 if (length > 2) {
223 7 coeffs += 2;
224
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 258 for (i = 0; i < length - 2 >> 1; i++) {
225 251 unsigned a3 = *coeffs + a1;
226 251 unsigned a4 = a3 + a2;
227 251 *coeffs = a4;
228 251 a1 = coeffs[1] + a3;
229 251 a2 = a1 + a4;
230 251 coeffs[1] = a2;
231 251 coeffs += 2;
232 }
233
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 7 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 3970 static int decode_segment(TAKDecContext *s, int8_t mode, int32_t *decoded, int len)
258 {
259 struct CParam code;
260 3970 GetBitContext *gb = &s->gb;
261 int i;
262
263
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 3970 if (!mode) {
264 ✗ memset(decoded, 0, len * sizeof(*decoded));
265 ✗ return 0;
266 }
267
268
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 3970 if (mode > FF_ARRAY_ELEMS(xcodes))
269 ✗ return AVERROR_INVALIDDATA;
270 3970 code = xcodes[mode - 1];
271
272
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 863842 for (i = 0; i < len; i++) {
273 859872 unsigned x = get_bits_long(gb, code.init);
274
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 859872 if (x >= code.escape && get_bits1(gb)) {
275 186781 x |= 1 << code.init;
276
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 186781 if (x >= code.aescape) {
277 138466 unsigned scale = get_unary(gb, 1, 9);
278
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 138466 if (scale == 9) {
279 164 int scale_bits = get_bits(gb, 3);
280
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 164 if (scale_bits > 0) {
281
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 109 if (scale_bits == 7) {
282 ✗ scale_bits += get_bits(gb, 5);
283 ✗ if (scale_bits > 29)
284 ✗ return AVERROR_INVALIDDATA;
285 }
286 109 scale = get_bits_long(gb, scale_bits) + 1;
287 109 x += code.scale * scale;
288 }
289 164 x += code.bias;
290 } else
291 138302 x += code.scale * scale - code.escape;
292 } else
293 48315 x -= code.escape;
294 }
295 859872 decoded[i] = (x >> 1) ^ -(x & 1);
296 }
297
298 3970 return 0;
299 }
300
301 346 static int decode_residues(TAKDecContext *s, int32_t *decoded, int length)
302 {
303 346 GetBitContext *gb = &s->gb;
304 int i, mode, ret;
305
306
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 346 if (length > s->nb_samples)
307 ✗ return AVERROR_INVALIDDATA;
308
309
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 346 if (get_bits1(gb)) {
310 int wlength, rval;
311
312 252 wlength = length / s->uval;
313
314 252 rval = length - (wlength * s->uval);
315
316
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 252 if (rval < s->uval / 2)
317 210 rval += s->uval;
318 else
319 42 wlength++;
320
321
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 252 if (wlength <= 1 || wlength > 128)
322 ✗ return AVERROR_INVALIDDATA;
323
324 252 s->coding_mode[0] = mode = get_bits(gb, 6);
325
326
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 9051 for (i = 1; i < wlength; i++) {
327 8799 int c = get_unary(gb, 1, 6);
328
329
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 8799 switch (c) {
330 ✗ case 6:
331 ✗ mode = get_bits(gb, 6);
332 ✗ break;
333 238 case 5:
334 case 4:
335 case 3: {
336 /* mode += sign ? (1 - c) : (c - 1) */
337 238 int sign = get_bits1(gb);
338 238 mode += (-sign ^ (c - 1)) + sign;
339 238 break;
340 }
341 1625 case 2:
342 1625 mode++;
343 1625 break;
344 1761 case 1:
345 1761 mode--;
346 1761 break;
347 }
348 8799 s->coding_mode[i] = mode;
349 }
350
351 252 i = 0;
352
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 4128 while (i < wlength) {
353 3876 int len = 0;
354
355 3876 mode = s->coding_mode[i];
356 do {
357
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 9051 if (i >= wlength - 1)
358 252 len += rval;
359 else
360 8799 len += s->uval;
361 9051 i++;
362
363
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 9051 if (i == wlength)
364 252 break;
365
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 8799 } while (s->coding_mode[i] == mode);
366
367
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 3876 if ((ret = decode_segment(s, mode, decoded, len)) < 0)
368 ✗ return ret;
369 3876 decoded += len;
370 }
371 } else {
372 94 mode = get_bits(gb, 6);
373
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 94 if ((ret = decode_segment(s, mode, decoded, length)) < 0)
374 ✗ return ret;
375 }
376
377 346 return 0;
378 }
379
380 382 static int get_bits_esc4(GetBitContext *gb)
381 {
382
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 382 if (get_bits1(gb))
383 25 return get_bits(gb, 4) + 1;
384 else
385 357 return 0;
386 }
387
388 268 static int decode_subframe(TAKDecContext *s, int32_t *decoded,
389 int subframe_size, int prev_subframe_size)
390 {
391 268 GetBitContext *gb = &s->gb;
392 268 int x, y, i, j, ret = 0;
393 int dshift, size, filter_quant, filter_order;
394 int tfilter[MAX_PREDICTORS];
395
396
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 268 if (!get_bits1(gb))
397 ✗ return decode_residues(s, decoded, subframe_size);
398
399 268 filter_order = predictor_sizes[get_bits(gb, 4)];
400
401
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 268 if (prev_subframe_size > 0 && get_bits1(gb)) {
402
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 190 if (filter_order > prev_subframe_size)
403 ✗ return AVERROR_INVALIDDATA;
404
405 190 decoded -= filter_order;
406 190 subframe_size += filter_order;
407
408
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 190 if (filter_order > subframe_size)
409 ✗ return AVERROR_INVALIDDATA;
410 } else {
411 int lpc_mode;
412
413
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 78 if (filter_order > subframe_size)
414 ✗ return AVERROR_INVALIDDATA;
415
416 78 lpc_mode = get_bits(gb, 2);
417
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 78 if (lpc_mode > 2)
418 ✗ return AVERROR_INVALIDDATA;
419
420
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 78 if ((ret = decode_residues(s, decoded, filter_order)) < 0)
421 ✗ return ret;
422
423
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 78 if (lpc_mode)
424 46 decode_lpc(decoded, lpc_mode, filter_order);
425 }
426
427 268 dshift = get_bits_esc4(gb);
428 268 size = get_bits1(gb) + 6;
429
430 268 filter_quant = 10;
431
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 268 if (get_bits1(gb)) {
432 ✗ filter_quant -= get_bits(gb, 3) + 1;
433 ✗ if (filter_quant < 3)
434 ✗ return AVERROR_INVALIDDATA;
435 }
436
437
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 268 if (get_bits_left(gb) < 2*10 + 2*size)
438 ✗ return AVERROR_INVALIDDATA;
439
440 268 s->predictors[0] = get_sbits(gb, 10);
441 268 s->predictors[1] = get_sbits(gb, 10);
442 268 s->predictors[2] = get_sbits(gb, size) * (1 << (10 - size));
443 268 s->predictors[3] = get_sbits(gb, size) * (1 << (10 - size));
444
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 268 if (filter_order > 4) {
445 245 int tmp = size - get_bits1(gb);
446
447
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 9113 for (i = 4; i < filter_order; i++) {
448
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 8868 if (!(i & 3))
449 2217 x = tmp - get_bits(gb, 2);
450 8868 s->predictors[i] = get_sbits(gb, x) * (1 << (10 - size));
451 }
452 }
453
454 268 tfilter[0] = s->predictors[0] * 64;
455
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 9940 for (i = 1; i < filter_order; i++) {
456 9672 uint32_t *p1 = &tfilter[0];
457 9672 uint32_t *p2 = &tfilter[i - 1];
458
459
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 216180 for (j = 0; j < (i + 1) / 2; j++) {
460 206508 x = *p1 + ((int32_t)(s->predictors[i] * *p2 + 256) >> 9);
461 206508 *p2 += (int32_t)(s->predictors[i] * *p1 + 256) >> 9;
462 206508 *p1++ = x;
463 206508 p2--;
464 }
465
466 9672 tfilter[i] = s->predictors[i] * 64;
467 }
468
469 268 x = 1 << (32 - (15 - filter_quant));
470 268 y = 1 << ((15 - filter_quant) - 1);
471
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 5238 for (i = 0, j = filter_order - 1; i < filter_order / 2; i++, j--) {
472 4970 s->filter[j] = x - ((tfilter[i] + y) >> (15 - filter_quant));
473 4970 s->filter[i] = x - ((tfilter[j] + y) >> (15 - filter_quant));
474 }
475
476
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 268 if ((ret = decode_residues(s, &decoded[filter_order],
477 subframe_size - filter_order)) < 0)
478 ✗ return ret;
479
480
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 10208 for (i = 0; i < filter_order; i++)
481 9940 s->residues[i] = *decoded++ >> dshift;
482
483 268 y = FF_ARRAY_ELEMS(s->residues) - filter_order;
484 268 x = subframe_size - filter_order;
485
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 2160 while (x > 0) {
486 1892 int tmp = FFMIN(y, x);
487
488
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 857832 for (i = 0; i < tmp; i++) {
489 855940 int v = 1 << (filter_quant - 1);
490
491
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 855940 if (filter_order & -16)
492 703880 v += (unsigned)s->adsp.scalarproduct_int16(&s->residues[i], s->filter,
493 filter_order & -16);
494
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 1351472 for (j = filter_order & -16; j < filter_order; j += 4) {
495 495532 v += s->residues[i + j + 3] * (unsigned)s->filter[j + 3] +
496 495532 s->residues[i + j + 2] * (unsigned)s->filter[j + 2] +
497 495532 s->residues[i + j + 1] * (unsigned)s->filter[j + 1] +
498 495532 s->residues[i + j ] * (unsigned)s->filter[j ];
499 }
500 855940 v = (av_clip_intp2(v >> filter_quant, 13) * (1 << dshift)) - (unsigned)*decoded;
501 855940 *decoded++ = v;
502 855940 s->residues[filter_order + i] = v >> dshift;
503 }
504
505 1892 x -= tmp;
506
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 1892 if (x > 0)
507 1624 memcpy(s->residues, &s->residues[y], 2 * filter_order);
508 }
509
510 268 return 0;
511 }
512
513 78 static int decode_channel(TAKDecContext *s, int chan)
514 {
515 78 AVCodecContext *avctx = s->avctx;
516 78 GetBitContext *gb = &s->gb;
517 78 int32_t *decoded = s->decoded[chan];
518 78 int left = s->nb_samples - 1;
519 78 int i = 0, ret, prev = 0;
520
521 78 s->sample_shift[chan] = get_bits_esc4(gb);
522
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 78 if (s->sample_shift[chan] >= avctx->bits_per_raw_sample)
523 ✗ return AVERROR_INVALIDDATA;
524
525 78 *decoded++ = get_sbits(gb, avctx->bits_per_raw_sample - s->sample_shift[chan]);
526 78 s->lpc_mode[chan] = get_bits(gb, 2);
527 78 s->nb_subframes = get_bits(gb, 3) + 1;
528
529
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 78 if (s->nb_subframes > 1) {
530
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 69 if (get_bits_left(gb) < (s->nb_subframes - 1) * 6)
531 ✗ return AVERROR_INVALIDDATA;
532
533
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 259 for (; i < s->nb_subframes - 1; i++) {
534 190 int v = get_bits(gb, 6);
535
536 190 s->subframe_len[i] = (v - prev) * s->subframe_scale;
537
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 190 if (s->subframe_len[i] <= 0)
538 ✗ return AVERROR_INVALIDDATA;
539
540 190 left -= s->subframe_len[i];
541 190 prev = v;
542 }
543
544
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 69 if (left <= 0)
545 ✗ return AVERROR_INVALIDDATA;
546 }
547 78 s->subframe_len[i] = left;
548
549 78 prev = 0;
550
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 346 for (i = 0; i < s->nb_subframes; i++) {
551
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 268 if ((ret = decode_subframe(s, decoded, s->subframe_len[i], prev)) < 0)
552 ✗ return ret;
553 268 decoded += s->subframe_len[i];
554 268 prev = s->subframe_len[i];
555 }
556
557 78 return 0;
558 }
559
560 39 static int decorrelate(TAKDecContext *s, int c1, int c2, int length)
561 {
562 39 GetBitContext *gb = &s->gb;
563
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 39 int32_t *p1 = s->decoded[c1] + (s->dmode > 5);
564
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 39 int32_t *p2 = s->decoded[c2] + (s->dmode > 5);
565 39 int32_t bp1 = p1[0];
566 39 int32_t bp2 = p2[0];
567 int i;
568 int dshift, dfactor;
569
570 39 length += s->dmode < 6;
571
572
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 39 switch (s->dmode) {
573 1 case 1: /* left/side */
574 1 s->tdsp.decorrelate_ls(p1, p2, length);
575 1 break;
576 ✗ case 2: /* side/right */
577 ✗ s->tdsp.decorrelate_sr(p1, p2, length);
578 ✗ break;
579 2 case 3: /* side/mid */
580 2 s->tdsp.decorrelate_sm(p1, p2, length);
581 2 break;
582 4 case 4: /* side/left with scale factor */
583 4 FFSWAP(int32_t*, p1, p2);
584 4 FFSWAP(int32_t, bp1, bp2);
585 6 case 5: /* side/right with scale factor */
586 6 dshift = get_bits_esc4(gb);
587 6 dfactor = get_sbits(gb, 10);
588 6 s->tdsp.decorrelate_sf(p1, p2, length, dshift, dfactor);
589 6 break;
590 13 case 6:
591 13 FFSWAP(int32_t*, p1, p2);
592 30 case 7: {
593 int length2, order_half, filter_order, dval1, dval2;
594 int tmp, x, code_size;
595
596
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 30 if (length < 256)
597 ✗ return AVERROR_INVALIDDATA;
598
599 30 dshift = get_bits_esc4(gb);
600 30 filter_order = 8 << get_bits1(gb);
601 30 dval1 = get_bits1(gb);
602 30 dval2 = get_bits1(gb);
603
604
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 366 for (i = 0; i < filter_order; i++) {
605
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 336 if (!(i & 3))
606 84 code_size = 14 - get_bits(gb, 3);
607 336 s->filter[i] = get_sbits(gb, code_size);
608 }
609
610 30 order_half = filter_order / 2;
611 30 length2 = length - (filter_order - 1);
612
613 /* decorrelate beginning samples */
614
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 30 if (dval1) {
615
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 141 for (i = 0; i < order_half; i++) {
616 120 int32_t a = p1[i];
617 120 int32_t b = p2[i];
618 120 p1[i] = a + b;
619 }
620 }
621
622 /* decorrelate ending samples */
623
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 30 if (dval2) {
624
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 96 for (i = length2 + order_half; i < length; i++) {
625 78 int32_t a = p1[i];
626 78 int32_t b = p2[i];
627 78 p1[i] = a + b;
628 }
629 }
630
631
632
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 366 for (i = 0; i < filter_order; i++)
633 336 s->residues[i] = *p2++ >> dshift;
634
635 30 p1 += order_half;
636 30 x = FF_ARRAY_ELEMS(s->residues) - filter_order;
637
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 660 for (; length2 > 0; length2 -= tmp) {
638 630 tmp = FFMIN(length2, x);
639
640
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 331014 for (i = 0; i < tmp - (tmp == length2); i++)
641 330384 s->residues[filter_order + i] = *p2++ >> dshift;
642
643
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 331044 for (i = 0; i < tmp; i++) {
644 330414 int v = 1 << 9;
645
646
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 330414 if (filter_order == 16) {
647 132108 v += s->adsp.scalarproduct_int16(&s->residues[i], s->filter,
648 filter_order);
649 } else {
650 198306 v += s->residues[i + 7] * s->filter[7] +
651 198306 s->residues[i + 6] * s->filter[6] +
652 198306 s->residues[i + 5] * s->filter[5] +
653 198306 s->residues[i + 4] * s->filter[4] +
654 198306 s->residues[i + 3] * s->filter[3] +
655 198306 s->residues[i + 2] * s->filter[2] +
656 198306 s->residues[i + 1] * s->filter[1] +
657 198306 s->residues[i ] * s->filter[0];
658 }
659
660 330414 v = av_clip_intp2(v >> 10, 13) * (1U << dshift) - *p1;
661 330414 *p1++ = v;
662 }
663
664 630 memmove(s->residues, &s->residues[tmp], 2 * filter_order);
665 }
666 30 break;
667 }
668 }
669
670
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 39 if (s->dmode > 0 && s->dmode < 6) {
671 9 p1[0] = bp1;
672 9 p2[0] = bp2;
673 }
674
675 39 return 0;
676 }
677
678 39 static int tak_decode_frame(AVCodecContext *avctx, AVFrame *frame,
679 int *got_frame_ptr, AVPacket *pkt)
680 {
681 39 TAKDecContext *s = avctx->priv_data;
682 39 GetBitContext *gb = &s->gb;
683 int chan, i, ret, hsize;
684
685
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 39 if (pkt->size < TAK_MIN_FRAME_HEADER_BYTES)
686 ✗ return AVERROR_INVALIDDATA;
687
688
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 39 if ((ret = init_get_bits8(gb, pkt->data, pkt->size)) < 0)
689 ✗ return ret;
690
691
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 39 if ((ret = ff_tak_decode_frame_header(avctx, gb, &s->ti, 0)) < 0)
692 ✗ return ret;
693
694 39 hsize = get_bits_count(gb) / 8;
695
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 39 if (avctx->err_recognition & (AV_EF_CRCCHECK|AV_EF_COMPLIANT)) {
696 ✗ if (ff_tak_check_crc(pkt->data, hsize)) {
697 ✗ av_log(avctx, AV_LOG_ERROR, "CRC error\n");
698 ✗ if (avctx->err_recognition & AV_EF_EXPLODE)
699 ✗ return AVERROR_INVALIDDATA;
700 }
701 }
702
703
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 39 if (s->ti.codec != TAK_CODEC_MONO_STEREO &&
704 ✗ s->ti.codec != TAK_CODEC_MULTICHANNEL) {
705 ✗ avpriv_report_missing_feature(avctx, "TAK codec type %d", s->ti.codec);
706 ✗ return AVERROR_PATCHWELCOME;
707 }
708
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 39 if (s->ti.data_type) {
709 ✗ av_log(avctx, AV_LOG_ERROR,
710 "unsupported data type: %d\n", s->ti.data_type);
711 ✗ return AVERROR_INVALIDDATA;
712 }
713
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 39 if (s->ti.codec == TAK_CODEC_MONO_STEREO && s->ti.channels > 2) {
714 ✗ av_log(avctx, AV_LOG_ERROR,
715 "invalid number of channels: %d\n", s->ti.channels);
716 ✗ return AVERROR_INVALIDDATA;
717 }
718
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 39 if (s->ti.channels > 6) {
719 ✗ av_log(avctx, AV_LOG_ERROR,
720 "unsupported number of channels: %d\n", s->ti.channels);
721 ✗ return AVERROR_INVALIDDATA;
722 }
723
724
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 39 if (s->ti.frame_samples <= 0) {
725 ✗ av_log(avctx, AV_LOG_ERROR, "unsupported/invalid number of samples\n");
726 ✗ return AVERROR_INVALIDDATA;
727 }
728
729 39 avctx->bits_per_raw_sample = s->ti.bps;
730
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 39 if ((ret = set_bps_params(avctx)) < 0)
731 ✗ return ret;
732
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 39 if (s->ti.sample_rate != avctx->sample_rate) {
733 ✗ avctx->sample_rate = s->ti.sample_rate;
734 ✗ set_sample_rate_params(avctx);
735 }
736
737 39 av_channel_layout_uninit(&avctx->ch_layout);
738
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 39 if (s->ti.ch_layout) {
739 ✗ av_channel_layout_from_mask(&avctx->ch_layout, s->ti.ch_layout);
740 } else {
741 39 avctx->ch_layout.order = AV_CHANNEL_ORDER_UNSPEC;
742 39 avctx->ch_layout.nb_channels = s->ti.channels;
743 }
744
745 78 s->nb_samples = s->ti.last_frame_samples ? s->ti.last_frame_samples
746
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 39 : s->ti.frame_samples;
747
748 39 frame->nb_samples = s->nb_samples;
749
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 39 if ((ret = ff_thread_get_buffer(avctx, frame, 0)) < 0)
750 ✗ return ret;
751 39 ff_thread_finish_setup(avctx);
752
753
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 39 if (avctx->bits_per_raw_sample <= 16) {
754 39 int buf_size = av_samples_get_buffer_size(NULL, avctx->ch_layout.nb_channels,
755 s->nb_samples,
756 AV_SAMPLE_FMT_S32P, 0);
757
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 39 if (buf_size < 0)
758 ✗ return buf_size;
759 39 av_fast_malloc(&s->decode_buffer, &s->decode_buffer_size, buf_size);
760
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 39 if (!s->decode_buffer)
761 ✗ return AVERROR(ENOMEM);
762 39 ret = av_samples_fill_arrays((uint8_t **)s->decoded, NULL,
763 39 s->decode_buffer, avctx->ch_layout.nb_channels,
764 s->nb_samples, AV_SAMPLE_FMT_S32P, 0);
765
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 39 if (ret < 0)
766 ✗ return ret;
767 } else {
768 ✗ for (chan = 0; chan < avctx->ch_layout.nb_channels; chan++)
769 ✗ s->decoded[chan] = (int32_t *)frame->extended_data[chan];
770 }
771
772
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 39 if (s->nb_samples < 16) {
773 ✗ for (chan = 0; chan < avctx->ch_layout.nb_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);
777 }
778 } else {
779
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 39 if (s->ti.codec == TAK_CODEC_MONO_STEREO) {
780
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 117 for (chan = 0; chan < avctx->ch_layout.nb_channels; chan++)
781
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 78 if (ret = decode_channel(s, chan))
782 ✗ return ret;
783
784
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 39 if (avctx->ch_layout.nb_channels == 2) {
785 39 s->nb_subframes = get_bits(gb, 1) + 1;
786
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 39 if (s->nb_subframes > 1) {
787 ✗ s->subframe_len[1] = get_bits(gb, 6);
788 }
789
790 39 s->dmode = get_bits(gb, 3);
791
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 39 if (ret = decorrelate(s, 0, 1, s->nb_samples - 1))
792 ✗ return ret;
793 }
794 ✗ } else if (s->ti.codec == TAK_CODEC_MULTICHANNEL) {
795 ✗ if (get_bits1(gb)) {
796 ✗ int ch_mask = 0;
797
798 ✗ chan = get_bits(gb, 4) + 1;
799 ✗ if (chan > avctx->ch_layout.nb_channels)
800 ✗ return AVERROR_INVALIDDATA;
801
802 ✗ for (i = 0; i < chan; i++) {
803 ✗ int nbit = get_bits(gb, 4);
804
805 ✗ if (nbit >= avctx->ch_layout.nb_channels)
806 ✗ return AVERROR_INVALIDDATA;
807
808 ✗ if (ch_mask & 1 << nbit)
809 ✗ return AVERROR_INVALIDDATA;
810
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].chan2 >= avctx->ch_layout.nb_channels) {
816 ✗ av_log(avctx, AV_LOG_ERROR,
817 "invalid channel 2 (%d) for %d channel(s)\n",
818 ✗ s->mcdparams[i].chan2, avctx->ch_layout.nb_channels);
819 ✗ return AVERROR_INVALIDDATA;
820 }
821 ✗ if (s->mcdparams[i].index == 1) {
822 ✗ if ((nbit == s->mcdparams[i].chan2) ||
823 ✗ (ch_mask & 1 << s->mcdparams[i].chan2))
824 ✗ return AVERROR_INVALIDDATA;
825
826 ✗ ch_mask |= 1 << s->mcdparams[i].chan2;
827 ✗ } else if (!(ch_mask & 1 << s->mcdparams[i].chan2)) {
828 ✗ return AVERROR_INVALIDDATA;
829 }
830 }
831 ✗ s->mcdparams[i].chan1 = nbit;
832
833 ✗ ch_mask |= 1 << nbit;
834 }
835 } else {
836 ✗ chan = avctx->ch_layout.nb_channels;
837 ✗ for (i = 0; i < chan; i++) {
838 ✗ s->mcdparams[i].present = 0;
839 ✗ s->mcdparams[i].chan1 = i;
840 }
841 }
842
843 ✗ for (i = 0; i < chan; i++) {
844 ✗ if (s->mcdparams[i].present && s->mcdparams[i].index == 1)
845 ✗ if (ret = decode_channel(s, s->mcdparams[i].chan2))
846 ✗ return ret;
847
848 ✗ if (ret = decode_channel(s, s->mcdparams[i].chan1))
849 ✗ return ret;
850
851 ✗ if (s->mcdparams[i].present) {
852 ✗ s->dmode = mc_dmodes[s->mcdparams[i].index];
853 ✗ if (ret = decorrelate(s,
854 ✗ s->mcdparams[i].chan2,
855 ✗ s->mcdparams[i].chan1,
856 ✗ s->nb_samples - 1))
857 ✗ return ret;
858 }
859 }
860 }
861
862
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 117 for (chan = 0; chan < avctx->ch_layout.nb_channels; chan++) {
863 78 int32_t *decoded = s->decoded[chan];
864
865
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 78 if (s->lpc_mode[chan])
866 78 decode_lpc(decoded, s->lpc_mode[chan], s->nb_samples);
867
868
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 78 if (s->sample_shift[chan] > 0)
869 ✗ for (i = 0; i < s->nb_samples; i++)
870 ✗ decoded[i] *= 1U << s->sample_shift[chan];
871 }
872 }
873
874 39 align_get_bits(gb);
875 39 skip_bits(gb, 24);
876
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 39 if (get_bits_left(gb) < 0)
877 ✗ av_log(avctx, AV_LOG_DEBUG, "overread\n");
878
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 39 else if (get_bits_left(gb) > 0)
879 ✗ av_log(avctx, AV_LOG_DEBUG, "underread\n");
880
881
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 39 if (avctx->err_recognition & (AV_EF_CRCCHECK | AV_EF_COMPLIANT)) {
882 ✗ if (ff_tak_check_crc(pkt->data + hsize,
883 ✗ get_bits_count(gb) / 8 - hsize)) {
884 ✗ av_log(avctx, AV_LOG_ERROR, "CRC error\n");
885 ✗ if (avctx->err_recognition & AV_EF_EXPLODE)
886 ✗ return AVERROR_INVALIDDATA;
887 }
888 }
889
890 /* convert to output buffer */
891
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 39 switch (avctx->sample_fmt) {
892 ✗ case AV_SAMPLE_FMT_U8P:
893 ✗ for (chan = 0; chan < avctx->ch_layout.nb_channels; chan++) {
894 ✗ uint8_t *samples = (uint8_t *)frame->extended_data[chan];
895 ✗ int32_t *decoded = s->decoded[chan];
896 ✗ for (i = 0; i < s->nb_samples; i++)
897 ✗ samples[i] = decoded[i] + 0x80U;
898 }
899 ✗ break;
900 39 case AV_SAMPLE_FMT_S16P:
901
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 117 for (chan = 0; chan < avctx->ch_layout.nb_channels; chan++) {
902 78 int16_t *samples = (int16_t *)frame->extended_data[chan];
903 78 int32_t *decoded = s->decoded[chan];
904
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 860028 for (i = 0; i < s->nb_samples; i++)
905 859950 samples[i] = decoded[i];
906 }
907 39 break;
908 ✗ case AV_SAMPLE_FMT_S32P:
909 ✗ for (chan = 0; chan < avctx->ch_layout.nb_channels; chan++) {
910 ✗ int32_t *samples = (int32_t *)frame->extended_data[chan];
911 ✗ for (i = 0; i < s->nb_samples; i++)
912 ✗ samples[i] *= 1U << 8;
913 }
914 ✗ break;
915 }
916
917 39 *got_frame_ptr = 1;
918
919 39 return pkt->size;
920 }
921
922 #if HAVE_THREADS
923 ✗ static int update_thread_context(AVCodecContext *dst,
924 const AVCodecContext *src)
925 {
926 ✗ TAKDecContext *tsrc = src->priv_data;
927 ✗ TAKDecContext *tdst = dst->priv_data;
928
929 ✗ if (dst == src)
930 ✗ return 0;
931 ✗ memcpy(&tdst->ti, &tsrc->ti, sizeof(TAKStreamInfo));
932 ✗ return 0;
933 }
934 #endif
935
936 2 static av_cold int tak_decode_close(AVCodecContext *avctx)
937 {
938 2 TAKDecContext *s = avctx->priv_data;
939
940 2 av_freep(&s->decode_buffer);
941
942 2 return 0;
943 }
944
945 const FFCodec ff_tak_decoder = {
946 .p.name = "tak",
947 CODEC_LONG_NAME("TAK (Tom's lossless Audio Kompressor)"),
948 .p.type = AVMEDIA_TYPE_AUDIO,
949 .p.id = AV_CODEC_ID_TAK,
950 .priv_data_size = sizeof(TAKDecContext),
951 .init = tak_decode_init,
952 .close = tak_decode_close,
953 FF_CODEC_DECODE_CB(tak_decode_frame),
954 UPDATE_THREAD_CONTEXT(update_thread_context),
955 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS | AV_CODEC_CAP_CHANNEL_CONF,
956 CODEC_SAMPLEFMTS(AV_SAMPLE_FMT_U8P, AV_SAMPLE_FMT_S16P, AV_SAMPLE_FMT_S32P),
957 };
958