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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 | }; |