FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/wavarc.c
Date: 2024-11-20 23:03:26
Exec Total Coverage
Lines: 0 558 0.0%
Functions: 0 16 0.0%
Branches: 0 359 0.0%
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1 /*
2 * WavArc audio decoder
3 * Copyright (c) 2023 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 #include "libavutil/intreadwrite.h"
23 #include "libavutil/mem.h"
24 #include "avcodec.h"
25 #include "codec_internal.h"
26 #include "decode.h"
27 #include "get_bits.h"
28 #include "mathops.h"
29 #include "unary.h"
30
31 typedef struct WavArcContext {
32 AVClass *av_class;
33
34 GetBitContext gb;
35
36 int shift;
37 int nb_samples;
38 int offset;
39 int align;
40
41 int eof;
42 int skip;
43 uint8_t *bitstream;
44 int64_t max_framesize;
45 int bitstream_size;
46 int bitstream_index;
47
48 int pred[2][70];
49 int filter[2][70];
50 int samples[2][640];
51 uint8_t model[256];
52 uint16_t freqs[257];
53 uint16_t ac_value;
54 uint16_t ac_low;
55 uint16_t ac_high;
56 uint16_t range_high;
57 uint16_t range_low;
58 uint16_t freq_range;
59 int ac_pred[70];
60 int ac_out[570];
61 } WavArcContext;
62
63 ✗ static av_cold int wavarc_init(AVCodecContext *avctx)
64 {
65 ✗ WavArcContext *s = avctx->priv_data;
66
67 ✗ if (avctx->extradata_size < 52)
68 ✗ return AVERROR_INVALIDDATA;
69 ✗ if (AV_RL32(avctx->extradata + 16) != MKTAG('R','I','F','F'))
70 ✗ return AVERROR_INVALIDDATA;
71 ✗ if (AV_RL32(avctx->extradata + 24) != MKTAG('W','A','V','E'))
72 ✗ return AVERROR_INVALIDDATA;
73 ✗ if (AV_RL32(avctx->extradata + 28) != MKTAG('f','m','t',' '))
74 ✗ return AVERROR_INVALIDDATA;
75 ✗ if (AV_RL16(avctx->extradata + 38) != 1 &&
76 ✗ AV_RL16(avctx->extradata + 38) != 2)
77 ✗ return AVERROR_INVALIDDATA;
78
79 ✗ av_channel_layout_uninit(&avctx->ch_layout);
80 ✗ av_channel_layout_default(&avctx->ch_layout, AV_RL16(avctx->extradata + 38));
81 ✗ avctx->sample_rate = AV_RL32(avctx->extradata + 40);
82
83 ✗ s->align = avctx->ch_layout.nb_channels;
84
85 ✗ switch (AV_RL16(avctx->extradata + 50)) {
86 ✗ case 8: avctx->sample_fmt = AV_SAMPLE_FMT_U8P; break;
87 ✗ case 16: s->align *= 2;
88 ✗ avctx->sample_fmt = AV_SAMPLE_FMT_S16P; break;
89 }
90
91 ✗ s->shift = 0;
92 ✗ switch (avctx->codec_tag) {
93 ✗ case MKTAG('0','C','P','Y'):
94 ✗ s->nb_samples = 640;
95 ✗ s->offset = 0;
96 ✗ break;
97 ✗ case MKTAG('1','D','I','F'):
98 ✗ s->nb_samples = 256;
99 ✗ s->offset = 4;
100 ✗ break;
101 ✗ case MKTAG('2','S','L','P'):
102 case MKTAG('3','N','L','P'):
103 case MKTAG('4','A','L','P'):
104 case MKTAG('5','E','L','P'):
105 ✗ s->nb_samples = 570;
106 ✗ s->offset = 70;
107 ✗ break;
108 ✗ default:
109 ✗ return AVERROR_INVALIDDATA;
110 }
111
112 ✗ s->max_framesize = s->nb_samples * 16;
113 ✗ s->bitstream = av_calloc(s->max_framesize + AV_INPUT_BUFFER_PADDING_SIZE, sizeof(*s->bitstream));
114 ✗ if (!s->bitstream)
115 ✗ return AVERROR(ENOMEM);
116
117 ✗ return 0;
118 }
119
120 ✗ static unsigned get_urice(GetBitContext *gb, int k)
121 {
122 ✗ unsigned x = get_unary(gb, 1, get_bits_left(gb));
123 ✗ unsigned y = get_bits_long(gb, k);
124 ✗ unsigned z = (x << k) | y;
125
126 ✗ return z;
127 }
128
129 ✗ static int get_srice(GetBitContext *gb, int k)
130 {
131 ✗ unsigned z = get_urice(gb, k);
132
133 ✗ return (z & 1) ? ~((int)(z >> 1)) : z >> 1;
134 }
135
136 ✗ static void do_stereo(WavArcContext *s, int ch, int correlated, int len)
137 {
138 ✗ const int nb_samples = s->nb_samples;
139 ✗ const int shift = s->shift;
140
141 ✗ if (ch == 0) {
142 ✗ if (correlated) {
143 ✗ for (int n = 0; n < len; n++) {
144 ✗ s->samples[0][n] = s->samples[0][nb_samples + n] >> shift;
145 ✗ s->samples[1][n] = s->pred[1][n] >> shift;
146 }
147 } else {
148 ✗ for (int n = 0; n < len; n++) {
149 ✗ s->samples[0][n] = s->samples[0][nb_samples + n] >> shift;
150 ✗ s->samples[1][n] = s->pred[0][n] >> shift;
151 }
152 }
153 } else {
154 ✗ if (correlated) {
155 ✗ for (int n = 0; n < nb_samples; n++)
156 ✗ s->samples[1][n + len] += (unsigned)s->samples[0][n + len];
157 }
158 ✗ for (int n = 0; n < len; n++) {
159 ✗ s->pred[0][n] = s->samples[1][nb_samples + n];
160 ✗ s->pred[1][n] = s->pred[0][n] - (unsigned)s->samples[0][nb_samples + n];
161 }
162 }
163 ✗ }
164
165 ✗ static int decode_0cpy(AVCodecContext *avctx,
166 WavArcContext *s, GetBitContext *gb)
167 {
168 ✗ const int bits = s->align * 8;
169
170 ✗ s->nb_samples = FFMIN(640, get_bits_left(gb) / bits);
171
172 ✗ switch (avctx->sample_fmt) {
173 ✗ case AV_SAMPLE_FMT_U8P:
174 ✗ for (int n = 0; n < s->nb_samples; n++) {
175 ✗ for (int ch = 0; ch < avctx->ch_layout.nb_channels; ch++)
176 ✗ s->samples[ch][n] = get_bits(gb, 8) - 0x80;
177 }
178 ✗ break;
179 ✗ case AV_SAMPLE_FMT_S16P:
180 ✗ for (int n = 0; n < s->nb_samples; n++) {
181 ✗ for (int ch = 0; ch < avctx->ch_layout.nb_channels; ch++)
182 ✗ s->samples[ch][n] = sign_extend(av_bswap16(get_bits(gb, 16)), 16);
183 }
184 ✗ break;
185 }
186 ✗ return 0;
187 }
188
189 ✗ static int decode_1dif(AVCodecContext *avctx,
190 WavArcContext *s, GetBitContext *gb)
191 {
192 int ch, finished, fill, correlated;
193
194 ✗ ch = 0;
195 ✗ finished = 0;
196 ✗ while (!finished) {
197 ✗ int *samples = s->samples[ch];
198 int k, block_type;
199
200 ✗ if (get_bits_left(gb) <= 0)
201 ✗ return AVERROR_INVALIDDATA;
202
203 ✗ block_type = get_urice(gb, 1);
204 ✗ if (block_type < 4 && block_type >= 0) {
205 ✗ k = 1 + (avctx->sample_fmt == AV_SAMPLE_FMT_S16P);
206 ✗ k = get_urice(gb, k) + 1;
207 ✗ if (k >= 32)
208 ✗ return AVERROR_INVALIDDATA;
209 }
210
211 ✗ switch (block_type) {
212 ✗ case 8:
213 ✗ s->eof = 1;
214 ✗ return AVERROR_EOF;
215 ✗ case 7:
216 ✗ s->nb_samples = get_bits(gb, 8);
217 ✗ continue;
218 ✗ case 6:
219 ✗ s->shift = get_urice(gb, 2);
220 ✗ if ((unsigned)s->shift > 31) {
221 ✗ s->shift = 0;
222 ✗ return AVERROR_INVALIDDATA;
223 }
224 ✗ continue;
225 ✗ case 5:
226 ✗ if (avctx->sample_fmt == AV_SAMPLE_FMT_U8P) {
227 ✗ fill = (int8_t)get_bits(gb, 8);
228 ✗ fill -= 0x80;
229 } else {
230 ✗ fill = (int16_t)get_bits(gb, 16);
231 ✗ fill -= 0x8000;
232 }
233
234 ✗ for (int n = 0; n < s->nb_samples; n++)
235 ✗ samples[n + 4] = fill;
236 ✗ finished = 1;
237 ✗ break;
238 ✗ case 4:
239 ✗ for (int n = 0; n < s->nb_samples; n++)
240 ✗ samples[n + 4] = 0;
241 ✗ finished = 1;
242 ✗ break;
243 ✗ case 3:
244 ✗ for (int n = 0; n < s->nb_samples; n++)
245 ✗ samples[n + 4] = get_srice(gb, k) + (samples[n + 3] - (unsigned)samples[n + 2]) * 3 +
246 ✗ samples[n + 1];
247 ✗ finished = 1;
248 ✗ break;
249 ✗ case 2:
250 ✗ for (int n = 0; n < s->nb_samples; n++)
251 ✗ samples[n + 4] = get_srice(gb, k) + (samples[n + 3] * 2U - samples[n + 2]);
252 ✗ finished = 1;
253 ✗ break;
254 ✗ case 1:
255 ✗ for (int n = 0; n < s->nb_samples; n++)
256 ✗ samples[n + 4] = get_srice(gb, k) + (unsigned)samples[n + 3];
257 ✗ finished = 1;
258 ✗ break;
259 ✗ case 0:
260 ✗ for (int n = 0; n < s->nb_samples; n++)
261 ✗ samples[n + 4] = get_srice(gb, k);
262 ✗ finished = 1;
263 ✗ break;
264 ✗ default:
265 ✗ return AVERROR_INVALIDDATA;
266 }
267
268 ✗ if (finished == 1 && avctx->ch_layout.nb_channels == 2) {
269 ✗ if (ch == 0)
270 ✗ correlated = get_bits1(gb);
271 ✗ finished = ch != 0;
272 ✗ do_stereo(s, ch, correlated, 4);
273 ✗ ch = 1;
274 }
275 }
276
277 ✗ if (avctx->ch_layout.nb_channels == 1) {
278 ✗ for (int n = 0; n < 4; n++)
279 ✗ s->samples[0][n] = s->samples[0][s->nb_samples + n];
280 }
281
282 ✗ return 0;
283 }
284
285 ✗ static int decode_2slp(AVCodecContext *avctx,
286 WavArcContext *s, GetBitContext *gb)
287 {
288 int ch, finished, fill, correlated, order;
289
290 ✗ ch = 0;
291 ✗ finished = 0;
292 ✗ while (!finished) {
293 ✗ int *samples = s->samples[ch];
294 int k, block_type;
295
296 ✗ if (get_bits_left(gb) <= 0)
297 ✗ return AVERROR_INVALIDDATA;
298
299 ✗ block_type = get_urice(gb, 1);
300 ✗ if (block_type < 5 && block_type >= 0) {
301 ✗ k = 1 + (avctx->sample_fmt == AV_SAMPLE_FMT_S16P);
302 ✗ k = get_urice(gb, k) + 1;
303 ✗ if (k >= 32)
304 ✗ return AVERROR_INVALIDDATA;
305 }
306
307 ✗ switch (block_type) {
308 ✗ case 9:
309 ✗ s->eof = 1;
310 ✗ return AVERROR_EOF;
311 ✗ case 8:
312 ✗ s->nb_samples = get_urice(gb, 8);
313 ✗ if (s->nb_samples > 570U) {
314 ✗ s->nb_samples = 570;
315 ✗ return AVERROR_INVALIDDATA;
316 }
317 ✗ continue;
318 ✗ case 7:
319 ✗ s->shift = get_urice(gb, 2);
320 ✗ if ((unsigned)s->shift > 31) {
321 ✗ s->shift = 0;
322 ✗ return AVERROR_INVALIDDATA;
323 }
324 ✗ continue;
325 ✗ case 6:
326 ✗ if (avctx->sample_fmt == AV_SAMPLE_FMT_U8P) {
327 ✗ fill = (int8_t)get_bits(gb, 8);
328 ✗ fill -= 0x80;
329 } else {
330 ✗ fill = (int16_t)get_bits(gb, 16);
331 ✗ fill -= 0x8000;
332 }
333
334 ✗ for (int n = 0; n < s->nb_samples; n++)
335 ✗ samples[n + 70] = fill;
336 ✗ finished = 1;
337 ✗ break;
338 ✗ case 5:
339 ✗ for (int n = 0; n < s->nb_samples; n++)
340 ✗ samples[n + 70] = 0;
341 ✗ finished = 1;
342 ✗ break;
343 ✗ case 4:
344 ✗ for (int n = 0; n < s->nb_samples; n++)
345 ✗ samples[n + 70] = get_srice(gb, k) + (samples[n + 69] - (unsigned)samples[n + 68]) * 3 +
346 ✗ samples[n + 67];
347 ✗ finished = 1;
348 ✗ break;
349 ✗ case 3:
350 ✗ for (int n = 0; n < s->nb_samples; n++)
351 ✗ samples[n + 70] = get_srice(gb, k) + (samples[n + 69] * 2U - samples[n + 68]);
352 ✗ finished = 1;
353 ✗ break;
354 ✗ case 2:
355 ✗ for (int n = 0; n < s->nb_samples; n++)
356 ✗ samples[n + 70] = get_srice(gb, k);
357 ✗ finished = 1;
358 ✗ break;
359 ✗ case 1:
360 ✗ for (int n = 0; n < s->nb_samples; n++)
361 ✗ samples[n + 70] = get_srice(gb, k) + (unsigned)samples[n + 69];
362 ✗ finished = 1;
363 ✗ break;
364 ✗ case 0:
365 ✗ order = get_urice(gb, 2);
366 ✗ if ((unsigned)order > FF_ARRAY_ELEMS(s->filter[ch]))
367 ✗ return AVERROR_INVALIDDATA;
368 ✗ for (int o = 0; o < order; o++)
369 ✗ s->filter[ch][o] = get_srice(gb, 2);
370 ✗ for (int n = 0; n < s->nb_samples; n++) {
371 ✗ int sum = 15;
372
373 ✗ for (int o = 0; o < order; o++)
374 ✗ sum += s->filter[ch][o] * (unsigned)samples[n + 70 - o - 1];
375
376 ✗ samples[n + 70] = get_srice(gb, k) + (unsigned)(sum >> 4);
377 }
378 ✗ finished = 1;
379 ✗ break;
380 ✗ default:
381 ✗ return AVERROR_INVALIDDATA;
382 }
383
384 ✗ if (finished == 1 && avctx->ch_layout.nb_channels == 2) {
385 ✗ if (ch == 0)
386 ✗ correlated = get_bits1(gb);
387 ✗ finished = ch != 0;
388 ✗ do_stereo(s, ch, correlated, 70);
389 ✗ ch = 1;
390 }
391 }
392
393 ✗ if (avctx->ch_layout.nb_channels == 1) {
394 ✗ for (int n = 0; n < 70; n++)
395 ✗ s->samples[0][n] = s->samples[0][s->nb_samples + n];
396 }
397
398 ✗ return 0;
399 }
400
401 ✗ static int ac_init(AVCodecContext *avctx,
402 WavArcContext *s, GetBitContext *gb)
403 {
404 ✗ s->ac_low = 0;
405 ✗ s->ac_high = 0xffffu;
406 ✗ s->ac_value = get_bits(gb, 16);
407
408 ✗ s->freq_range = s->freqs[256];
409 ✗ if (!s->freq_range)
410 ✗ return AVERROR_INVALIDDATA;
411 ✗ return 0;
412 }
413
414 ✗ static uint16_t ac_get_prob(WavArcContext *s)
415 {
416 ✗ return ((s->freq_range - 1) + (s->ac_value - s->ac_low) * (unsigned)s->freq_range) /
417 ✗ ((s->ac_high - s->ac_low) + 1U);
418 }
419
420 ✗ static uint8_t ac_map_symbol(WavArcContext *s, uint16_t prob)
421 {
422 ✗ int idx = 255;
423
424 ✗ while (prob < s->freqs[idx])
425 ✗ idx--;
426
427 ✗ s->range_high = s->freqs[idx + 1];
428 ✗ s->range_low = s->freqs[idx];
429
430 ✗ return idx;
431 }
432
433 ✗ static int ac_normalize(AVCodecContext *avctx, WavArcContext *s, GetBitContext *gb)
434 {
435 int range;
436
437 ✗ if (s->ac_high < s->ac_low)
438 ✗ goto fail;
439
440 ✗ range = (s->ac_high - s->ac_low) + 1;
441 ✗ s->ac_high = (range * (unsigned)s->range_high) / s->freq_range + s->ac_low - 1;
442 ✗ s->ac_low += (range * (unsigned)s->range_low) / s->freq_range;
443
444 ✗ if (s->ac_high < s->ac_low)
445 ✗ goto fail;
446
447 for (;;) {
448 ✗ if ((s->ac_high & 0x8000) != (s->ac_low & 0x8000)) {
449 ✗ if (((s->ac_low & 0x4000) == 0) || ((s->ac_high & 0x4000) != 0))
450 ✗ return 0;
451 ✗ s->ac_value ^= 0x4000;
452 ✗ s->ac_low &= 0x3fff;
453 ✗ s->ac_high |= 0x4000;
454 }
455
456 ✗ s->ac_low = s->ac_low * 2;
457 ✗ s->ac_high = s->ac_high * 2 | 1;
458 ✗ if (s->ac_high < s->ac_low)
459 ✗ goto fail;
460
461 ✗ if (get_bits_left(gb) <= 0) {
462 ✗ av_log(avctx, AV_LOG_ERROR, "overread in arithmetic coder\n");
463 ✗ goto fail;
464 }
465
466 ✗ s->ac_value = s->ac_value * 2 + get_bits1(gb);
467 ✗ if (s->ac_low > s->ac_value || s->ac_high < s->ac_value)
468 ✗ goto fail;
469 }
470
471 ✗ fail:
472 ✗ av_log(avctx, AV_LOG_ERROR, "invalid state\n");
473 ✗ return AVERROR_INVALIDDATA;
474 }
475
476 ✗ static void ac_init_model(WavArcContext *s)
477 {
478 ✗ memset(s->freqs, 0, sizeof(s->freqs));
479
480 ✗ for (int n = 0; n < 256; n++)
481 ✗ s->freqs[n+1] = s->model[n] + s->freqs[n];
482 ✗ }
483
484 ✗ static int ac_read_model(AVCodecContext *avctx,
485 WavArcContext *s,
486 GetBitContext *gb)
487 {
488 unsigned start, end;
489
490 ✗ memset(s->model, 0, sizeof(s->model));
491
492 ✗ start = get_bits(gb, 8);
493 ✗ end = get_bits(gb, 8);
494
495 for (;;) {
496 ✗ while (start <= end) {
497 ✗ if (get_bits_left(gb) < 8)
498 ✗ return AVERROR_INVALIDDATA;
499 ✗ s->model[start++] = get_bits(gb, 8);
500 }
501
502 ✗ if (get_bits_left(gb) < 8)
503 ✗ return AVERROR_INVALIDDATA;
504
505 ✗ start = get_bits(gb, 8);
506 ✗ if (!start)
507 ✗ break;
508
509 ✗ end = get_bits(gb, 8);
510 }
511
512 ✗ ac_init_model(s);
513
514 ✗ return 0;
515 }
516
517 ✗ static int decode_5elp(AVCodecContext *avctx,
518 WavArcContext *s, GetBitContext *gb)
519 {
520 ✗ int ch, finished, fill, correlated, order = 0;
521
522 ✗ ch = 0;
523 ✗ finished = 0;
524 ✗ while (!finished) {
525 ✗ int *samples = s->samples[ch];
526 ✗ int *ac_pred = s->ac_pred;
527 ✗ int *ac_out = s->ac_out;
528 int k, block_type;
529
530 ✗ if (get_bits_left(gb) <= 0)
531 ✗ return AVERROR_INVALIDDATA;
532
533 ✗ memset(s->ac_out, 0, sizeof(s->ac_out));
534
535 ✗ block_type = get_urice(gb, 1);
536 ✗ av_log(avctx, AV_LOG_DEBUG, "block_type : %d\n", block_type);
537
538 ✗ if (block_type >= 0 && block_type <= 7) {
539 ✗ k = 1 + (avctx->sample_fmt == AV_SAMPLE_FMT_S16P);
540 ✗ k = get_urice(gb, k) + 1;
541 ✗ if (k >= 32)
542 ✗ return AVERROR_INVALIDDATA;
543 }
544
545 ✗ if (block_type <= 2 || block_type == 6 || block_type == 13 ||
546 ✗ block_type == 14 || block_type == 15 || block_type == 19) {
547 ✗ order = get_urice(gb, 2);
548 ✗ if ((unsigned)order > FF_ARRAY_ELEMS(s->filter[ch]))
549 ✗ return AVERROR_INVALIDDATA;
550 ✗ for (int o = 0; o < order; o++)
551 ✗ s->filter[ch][o] = get_srice(gb, 2);
552 }
553
554 ✗ if (block_type >= 0 && block_type <= 7) {
555 ✗ for (int n = 0; n < s->nb_samples; n++)
556 ✗ samples[n + 70] = get_srice(gb, k);
557 } else {
558 ✗ for (int n = 0; n < s->nb_samples; n++)
559 ✗ samples[n + 70] = 0;
560 }
561
562 ✗ if (block_type >= 13 && block_type <= 20) {
563 ✗ const int ac_size = get_bits(gb, 12);
564 ✗ const int ac_pos = get_bits_count(gb);
565 ✗ GetBitContext ac_gb = *gb;
566 int ret;
567
568 ✗ skip_bits_long(gb, ac_size);
569 ✗ ret = ac_read_model(avctx, s, &ac_gb);
570 ✗ if (ret < 0) {
571 ✗ av_log(avctx, AV_LOG_ERROR, "bad arithmetic model\n");
572 ✗ return ret;
573 }
574
575 ✗ ret = ac_init(avctx, s, &ac_gb);
576 ✗ if (ret < 0) {
577 ✗ av_log(avctx, AV_LOG_ERROR, "cannot init arithmetic decoder\n");
578 ✗ return ret;
579 }
580
581 ✗ for (int n = 0; n < s->nb_samples; n++) {
582 ✗ uint16_t prob = ac_get_prob(s);
583 ✗ int ac = ac_map_symbol(s, prob);
584 ✗ ac_out[n] = ac - 0x80;
585 ✗ if ((ret = ac_normalize(avctx, s, &ac_gb)) < 0)
586 ✗ return ret;
587 }
588
589 ✗ if (get_bits_count(&ac_gb) != ac_pos + ac_size) {
590 ✗ av_log(avctx, AV_LOG_DEBUG, "over/under-read in arithmetic coder: %d\n",
591 ✗ ac_pos + ac_size - get_bits_count(&ac_gb));
592 }
593 }
594
595 ✗ switch (block_type) {
596 ✗ case 12:
597 ✗ s->eof = 1;
598 ✗ return AVERROR_EOF;
599 ✗ case 11:
600 ✗ s->nb_samples = get_urice(gb, 8);
601 ✗ if (s->nb_samples > 570U) {
602 ✗ s->nb_samples = 570;
603 ✗ return AVERROR_INVALIDDATA;
604 }
605 ✗ continue;
606 ✗ case 10:
607 ✗ s->shift = get_urice(gb, 2);
608 ✗ if ((unsigned)s->shift > 31) {
609 ✗ s->shift = 0;
610 ✗ return AVERROR_INVALIDDATA;
611 }
612 ✗ continue;
613 ✗ case 9:
614 ✗ if (avctx->sample_fmt == AV_SAMPLE_FMT_U8P) {
615 ✗ fill = (int8_t)get_bits(gb, 8);
616 ✗ fill -= 0x80;
617 } else {
618 ✗ fill = (int16_t)get_bits(gb, 16);
619 ✗ fill -= 0x8000;
620 }
621
622 ✗ for (int n = 0; n < s->nb_samples; n++)
623 ✗ samples[n + 70] = fill;
624 ✗ finished = 1;
625 ✗ break;
626 ✗ case 8:
627 ✗ for (int n = 0; n < s->nb_samples; n++)
628 ✗ samples[n + 70] = 0;
629 ✗ finished = 1;
630 ✗ break;
631 ✗ case 20:
632 case 7:
633 ✗ for (int n = 0; n < s->nb_samples; n++)
634 ✗ samples[n + 70] += ac_out[n] + samples[n + 69] * 3U - samples[n + 68] * 3U + samples[n + 67];
635 ✗ finished = 1;
636 ✗ break;
637 ✗ case 19:
638 case 6:
639 ✗ for (int n = 0; n < 70; n++) {
640 ✗ ac_pred[n] = samples[n];
641 ✗ samples[n] = 0;
642 }
643
644 ✗ for (int n = 0; n < s->nb_samples; n++) {
645 ✗ int sum = 15;
646
647 ✗ for (int o = 0; o < order; o++)
648 ✗ sum += s->filter[ch][o] * (unsigned)samples[n + 70 - o - 1];
649
650 ✗ samples[n + 70] += ac_out[n] + (unsigned)(sum >> 4);
651 }
652
653 ✗ for (int n = 0; n < 70; n++)
654 ✗ samples[n] = ac_pred[n];
655
656 ✗ for (int n = 0; n < s->nb_samples; n++)
657 ✗ samples[n + 70] += ac_out[n] + samples[n + 69] * 3U - samples[n + 68] * 3U + samples[n + 67];
658
659 ✗ finished = 1;
660 ✗ break;
661 ✗ case 18:
662 case 5:
663 ✗ for (int n = 0; n < s->nb_samples; n++)
664 ✗ samples[n + 70] += ac_out[n] + samples[n + 69] * 2U - samples[n + 68];
665 ✗ finished = 1;
666 ✗ break;
667 ✗ case 17:
668 case 4:
669 ✗ for (int n = 0; n < s->nb_samples; n++)
670 ✗ samples[n + 70] += ac_out[n];
671 ✗ finished = 1;
672 ✗ break;
673 ✗ case 16:
674 case 3:
675 ✗ for (int n = 0; n < s->nb_samples; n++)
676 ✗ samples[n + 70] += ac_out[n] + (unsigned)samples[n + 69];
677 ✗ finished = 1;
678 ✗ break;
679 ✗ case 15:
680 case 2:
681 ✗ for (int n = 0; n < 70; n++) {
682 ✗ ac_pred[n] = samples[n];
683 ✗ samples[n] = 0;
684 }
685
686 ✗ for (int n = 0; n < s->nb_samples; n++) {
687 ✗ int sum = 15;
688
689 ✗ for (int o = 0; o < order; o++)
690 ✗ sum += s->filter[ch][o] * (unsigned)samples[n + 70 - o - 1];
691
692 ✗ samples[n + 70] += ac_out[n] + (unsigned)(sum >> 4);
693 }
694
695 ✗ for (int n = 0; n < 70; n++)
696 ✗ samples[n] = ac_pred[n];
697
698 ✗ for (int n = 0; n < s->nb_samples; n++)
699 ✗ samples[n + 70] += samples[n + 69] * 2U - samples[n + 68];
700
701 ✗ finished = 1;
702 ✗ break;
703 ✗ case 14:
704 case 1:
705 ✗ for (int n = 0; n < 70; n++) {
706 ✗ ac_pred[n] = samples[n];
707 ✗ samples[n] = 0;
708 }
709
710 ✗ for (int n = 0; n < s->nb_samples; n++) {
711 ✗ int sum = 15;
712
713 ✗ for (int o = 0; o < order; o++)
714 ✗ sum += s->filter[ch][o] * (unsigned)samples[n + 70 - o - 1];
715
716 ✗ samples[n + 70] += (unsigned)ac_out[n] + (sum >> 4);
717 }
718
719 ✗ for (int n = 0; n < 70; n++)
720 ✗ samples[n] = ac_pred[n];
721
722 ✗ for (int n = 0; n < s->nb_samples; n++)
723 ✗ samples[n + 70] += (unsigned)samples[n + 69];
724
725 ✗ finished = 1;
726 ✗ break;
727 ✗ case 13:
728 case 0:
729 ✗ for (int n = 0; n < s->nb_samples; n++) {
730 ✗ int sum = 15;
731
732 ✗ for (int o = 0; o < order; o++)
733 ✗ sum += s->filter[ch][o] * (unsigned)samples[n + 70 - o - 1];
734
735 ✗ samples[n + 70] += (unsigned)ac_out[n] + (sum >> 4);
736 }
737 ✗ finished = 1;
738 ✗ break;
739 ✗ default:
740 ✗ return AVERROR_INVALIDDATA;
741 }
742
743 ✗ if (finished == 1 && avctx->ch_layout.nb_channels == 2) {
744 ✗ if (ch == 0)
745 ✗ correlated = get_bits1(gb);
746 ✗ finished = ch != 0;
747 ✗ do_stereo(s, ch, correlated, 70);
748 ✗ ch = 1;
749 }
750 }
751
752 ✗ if (avctx->ch_layout.nb_channels == 1) {
753 ✗ for (int n = 0; n < 70; n++)
754 ✗ s->samples[0][n] = s->samples[0][s->nb_samples + n];
755 }
756
757 ✗ return 0;
758 }
759
760 ✗ static int wavarc_decode(AVCodecContext *avctx, AVFrame *frame,
761 int *got_frame_ptr, AVPacket *pkt)
762 {
763 ✗ WavArcContext *s = avctx->priv_data;
764 ✗ GetBitContext *gb = &s->gb;
765 int buf_size, input_buf_size;
766 const uint8_t *buf;
767 int ret, n;
768
769 ✗ if ((!pkt->size && !s->bitstream_size) || s->nb_samples == 0 || s->eof) {
770 ✗ *got_frame_ptr = 0;
771 ✗ return pkt->size;
772 }
773
774 ✗ buf_size = FFMIN(pkt->size, s->max_framesize - s->bitstream_size);
775 ✗ input_buf_size = buf_size;
776 ✗ if (s->bitstream_index + s->bitstream_size + buf_size + AV_INPUT_BUFFER_PADDING_SIZE > s->max_framesize) {
777 ✗ memmove(s->bitstream, &s->bitstream[s->bitstream_index], s->bitstream_size);
778 ✗ s->bitstream_index = 0;
779 }
780 ✗ if (pkt->data)
781 ✗ memcpy(&s->bitstream[s->bitstream_index + s->bitstream_size], pkt->data, buf_size);
782 ✗ buf = &s->bitstream[s->bitstream_index];
783 ✗ buf_size += s->bitstream_size;
784 ✗ s->bitstream_size = buf_size;
785 ✗ if (buf_size < s->max_framesize && pkt->data) {
786 ✗ *got_frame_ptr = 0;
787 ✗ return input_buf_size;
788 }
789
790 ✗ if ((ret = init_get_bits8(gb, buf, buf_size)) < 0)
791 ✗ goto fail;
792 ✗ skip_bits(gb, s->skip);
793
794 ✗ switch (avctx->codec_tag) {
795 ✗ case MKTAG('0','C','P','Y'):
796 ✗ ret = decode_0cpy(avctx, s, gb);
797 ✗ break;
798 ✗ case MKTAG('1','D','I','F'):
799 ✗ ret = decode_1dif(avctx, s, gb);
800 ✗ break;
801 ✗ case MKTAG('2','S','L','P'):
802 case MKTAG('3','N','L','P'):
803 case MKTAG('4','A','L','P'):
804 ✗ ret = decode_2slp(avctx, s, gb);
805 ✗ break;
806 ✗ case MKTAG('5','E','L','P'):
807 ✗ ret = decode_5elp(avctx, s, gb);
808 ✗ break;
809 ✗ default:
810 ✗ ret = AVERROR_INVALIDDATA;
811 }
812
813 ✗ if (ret < 0)
814 ✗ goto fail;
815
816 ✗ s->skip = get_bits_count(gb) - 8 * (get_bits_count(gb) / 8);
817 ✗ n = get_bits_count(gb) / 8;
818
819 ✗ if (n > buf_size) {
820 ✗ fail:
821 ✗ s->bitstream_size = 0;
822 ✗ s->bitstream_index = 0;
823 ✗ if (ret == AVERROR_EOF)
824 ✗ return 0;
825 ✗ return AVERROR_INVALIDDATA;
826 }
827
828 ✗ frame->nb_samples = s->nb_samples;
829 ✗ if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
830 ✗ goto fail;
831
832 ✗ switch (avctx->sample_fmt) {
833 ✗ case AV_SAMPLE_FMT_U8P:
834 ✗ for (int ch = 0; ch < avctx->ch_layout.nb_channels; ch++) {
835 ✗ uint8_t *dst = (uint8_t *)frame->extended_data[ch];
836 ✗ const int *src = s->samples[ch] + s->offset;
837
838 ✗ for (int n = 0; n < frame->nb_samples; n++)
839 ✗ dst[n] = src[n] * (1U << s->shift) + 0x80U;
840 }
841 ✗ break;
842 ✗ case AV_SAMPLE_FMT_S16P:
843 ✗ for (int ch = 0; ch < avctx->ch_layout.nb_channels; ch++) {
844 ✗ int16_t *dst = (int16_t *)frame->extended_data[ch];
845 ✗ const int *src = s->samples[ch] + s->offset;
846
847 ✗ for (int n = 0; n < frame->nb_samples; n++)
848 ✗ dst[n] = src[n] * (1U << s->shift);
849 }
850 ✗ break;
851 }
852
853 ✗ *got_frame_ptr = 1;
854
855 ✗ if (s->bitstream_size) {
856 ✗ s->bitstream_index += n;
857 ✗ s->bitstream_size -= n;
858 ✗ return input_buf_size;
859 }
860
861 ✗ return n;
862 }
863
864 ✗ static av_cold int wavarc_close(AVCodecContext *avctx)
865 {
866 ✗ WavArcContext *s = avctx->priv_data;
867
868 ✗ av_freep(&s->bitstream);
869 ✗ s->bitstream_size = 0;
870
871 ✗ return 0;
872 }
873
874 const FFCodec ff_wavarc_decoder = {
875 .p.name = "wavarc",
876 CODEC_LONG_NAME("Waveform Archiver"),
877 .p.type = AVMEDIA_TYPE_AUDIO,
878 .p.id = AV_CODEC_ID_WAVARC,
879 .priv_data_size = sizeof(WavArcContext),
880 .init = wavarc_init,
881 FF_CODEC_DECODE_CB(wavarc_decode),
882 .close = wavarc_close,
883 .p.capabilities = AV_CODEC_CAP_DR1 |
884 #if FF_API_SUBFRAMES
885 AV_CODEC_CAP_SUBFRAMES |
886 #endif
887 AV_CODEC_CAP_DELAY,
888 .p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_U8P,
889 AV_SAMPLE_FMT_S16P,
890 AV_SAMPLE_FMT_NONE },
891 };
892