FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/interplayacm.c
Date: 2022-01-28 07:56:06
Exec Total Coverage
Lines: 0 341 0.0%
Branches: 0 160 0.0%
Line Branch Exec Source
1 /*
2 * Interplay ACM decoder
3 *
4 * Copyright (c) 2004-2008 Marko Kreen
5 * Copyright (c) 2008 Adam Gashlin
6 * Copyright (c) 2015 Paul B Mahol
7 *
8 * Permission to use, copy, modify, and distribute this software for any
9 * purpose with or without fee is hereby granted, provided that the above
10 * copyright notice and this permission notice appear in all copies.
11 *
12 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
13 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
14 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
15 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
16 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19 */
20
21 #include "libavutil/intreadwrite.h"
22 #include "libavutil/thread.h"
23
24 #define BITSTREAM_READER_LE
25 #include "avcodec.h"
26 #include "get_bits.h"
27 #include "internal.h"
28
29 static const int8_t map_1bit[] = { -1, +1 };
30 static const int8_t map_2bit_near[] = { -2, -1, +1, +2 };
31 static const int8_t map_2bit_far[] = { -3, -2, +2, +3 };
32 static const int8_t map_3bit[] = { -4, -3, -2, -1, +1, +2, +3, +4 };
33
34 static int mul_3x3 [3 * 3 * 3];
35 static int mul_3x5 [5 * 5 * 5];
36 static int mul_2x11[11 * 11];
37
38 typedef struct InterplayACMContext {
39 GetBitContext gb;
40 uint8_t *bitstream;
41 int max_framesize;
42 uint64_t max_samples;
43 int bitstream_size;
44 int bitstream_index;
45
46 int level;
47 int rows;
48 int cols;
49 int wrapbuf_len;
50 int block_len;
51 int skip;
52
53 int *block;
54 int *wrapbuf;
55 int *ampbuf;
56 int *midbuf;
57 } InterplayACMContext;
58
59 ✗ static av_cold void decode_init_static(void)
60 {
61 ✗ for (int x3 = 0; x3 < 3; x3++)
62 ✗ for (int x2 = 0; x2 < 3; x2++)
63 ✗ for (int x1 = 0; x1 < 3; x1++)
64 ✗ mul_3x3[x1 + x2 * 3 + x3 * 3 * 3] = x1 + (x2 << 4) + (x3 << 8);
65 ✗ for (int x3 = 0; x3 < 5; x3++)
66 ✗ for (int x2 = 0; x2 < 5; x2++)
67 ✗ for (int x1 = 0; x1 < 5; x1++)
68 ✗ mul_3x5[x1 + x2 * 5 + x3 * 5 * 5] = x1 + (x2 << 4) + (x3 << 8);
69 ✗ for (int x2 = 0; x2 < 11; x2++)
70 ✗ for (int x1 = 0; x1 < 11; x1++)
71 ✗ mul_2x11[x1 + x2 * 11] = x1 + (x2 << 4);
72 }
73
74 ✗ static av_cold int decode_init(AVCodecContext *avctx)
75 {
76 static AVOnce init_static_once = AV_ONCE_INIT;
77 ✗ InterplayACMContext *s = avctx->priv_data;
78
79 ✗ if (avctx->extradata_size < 14)
80 ✗ return AVERROR_INVALIDDATA;
81
82 ✗ if (avctx->channels <= 0) {
83 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid number of channels: %d\n", avctx->channels);
84 ✗ return AVERROR_INVALIDDATA;
85 }
86
87 ✗ s->max_samples = AV_RL32(avctx->extradata + 4) / avctx->channels;
88 ✗ if (s->max_samples == 0)
89 ✗ s->max_samples = UINT64_MAX;
90 ✗ s->level = AV_RL16(avctx->extradata + 12) & 0xf;
91 ✗ s->rows = AV_RL16(avctx->extradata + 12) >> 4;
92 ✗ s->cols = 1 << s->level;
93 ✗ s->wrapbuf_len = 2 * s->cols - 2;
94 ✗ s->block_len = s->rows * s->cols;
95 ✗ s->max_framesize = s->block_len;
96
97 ✗ s->block = av_calloc(s->block_len, sizeof(int));
98 ✗ s->wrapbuf = av_calloc(s->wrapbuf_len, sizeof(int));
99 ✗ s->ampbuf = av_calloc(0x10000, sizeof(int));
100 ✗ s->bitstream = av_calloc(s->max_framesize + AV_INPUT_BUFFER_PADDING_SIZE / sizeof(*s->bitstream) + 1, sizeof(*s->bitstream));
101 ✗ if (!s->block || !s->wrapbuf || !s->ampbuf || !s->bitstream)
102 ✗ return AVERROR(ENOMEM);
103
104 ✗ s->midbuf = s->ampbuf + 0x8000;
105 ✗ avctx->sample_fmt = AV_SAMPLE_FMT_S16;
106
107 ✗ ff_thread_once(&init_static_once, decode_init_static);
108
109 ✗ return 0;
110 }
111
112 #define set_pos(s, r, c, idx) do { \
113 unsigned pos = ((r) << s->level) + (c); \
114 s->block[pos] = s->midbuf[(idx)]; \
115 } while (0)
116
117 ✗ static int zero(InterplayACMContext *s, unsigned ind, unsigned col)
118 {
119 unsigned i;
120
121 ✗ for (i = 0; i < s->rows; i++)
122 ✗ set_pos(s, i, col, 0);
123 ✗ return 0;
124 }
125
126 ✗ static int bad(InterplayACMContext *s, unsigned ind, unsigned col)
127 {
128 ✗ return AVERROR_INVALIDDATA;
129 }
130
131 ✗ static int linear(InterplayACMContext *s, unsigned ind, unsigned col)
132 {
133 ✗ GetBitContext *gb = &s->gb;
134 unsigned int i;
135 ✗ int b, middle = 1 << (ind - 1);
136
137 ✗ for (i = 0; i < s->rows; i++) {
138 ✗ b = get_bits(gb, ind);
139 ✗ set_pos(s, i, col, b - middle);
140 }
141 ✗ return 0;
142 }
143
144 ✗ static int k13(InterplayACMContext *s, unsigned ind, unsigned col)
145 {
146 ✗ GetBitContext *gb = &s->gb;
147 unsigned i, b;
148
149 ✗ for (i = 0; i < s->rows; i++) {
150 ✗ b = get_bits1(gb);
151 ✗ if (b == 0) {
152 ✗ set_pos(s, i++, col, 0);
153 ✗ if (i >= s->rows)
154 ✗ break;
155 ✗ set_pos(s, i, col, 0);
156 ✗ continue;
157 }
158 ✗ b = get_bits1(gb);
159 ✗ if (b == 0) {
160 ✗ set_pos(s, i, col, 0);
161 ✗ continue;
162 }
163 ✗ b = get_bits1(gb);
164 ✗ set_pos(s, i, col, map_1bit[b]);
165 }
166 ✗ return 0;
167 }
168
169 ✗ static int k12(InterplayACMContext *s, unsigned ind, unsigned col)
170 {
171 ✗ GetBitContext *gb = &s->gb;
172 unsigned i, b;
173
174 ✗ for (i = 0; i < s->rows; i++) {
175 ✗ b = get_bits1(gb);
176 ✗ if (b == 0) {
177 ✗ set_pos(s, i, col, 0);
178 ✗ continue;
179 }
180
181 ✗ b = get_bits1(gb);
182 ✗ set_pos(s, i, col, map_1bit[b]);
183 }
184 ✗ return 0;
185 }
186
187 ✗ static int k24(InterplayACMContext *s, unsigned ind, unsigned col)
188 {
189 ✗ GetBitContext *gb = &s->gb;
190 unsigned i, b;
191
192 ✗ for (i = 0; i < s->rows; i++) {
193 ✗ b = get_bits1(gb);
194 ✗ if (b == 0) {
195 ✗ set_pos(s, i++, col, 0);
196 ✗ if (i >= s->rows) break;
197 ✗ set_pos(s, i, col, 0);
198 ✗ continue;
199 }
200
201 ✗ b = get_bits1(gb);
202 ✗ if (b == 0) {
203 ✗ set_pos(s, i, col, 0);
204 ✗ continue;
205 }
206
207 ✗ b = get_bits(gb, 2);
208 ✗ set_pos(s, i, col, map_2bit_near[b]);
209 }
210 ✗ return 0;
211 }
212
213 ✗ static int k23(InterplayACMContext *s, unsigned ind, unsigned col)
214 {
215 ✗ GetBitContext *gb = &s->gb;
216 unsigned i, b;
217
218 ✗ for (i = 0; i < s->rows; i++) {
219 ✗ b = get_bits1(gb);
220 ✗ if (b == 0) {
221 ✗ set_pos(s, i, col, 0);
222 ✗ continue;
223 }
224
225 ✗ b = get_bits(gb, 2);
226 ✗ set_pos(s, i, col, map_2bit_near[b]);
227 }
228 ✗ return 0;
229 }
230
231 ✗ static int k35(InterplayACMContext *s, unsigned ind, unsigned col)
232 {
233 ✗ GetBitContext *gb = &s->gb;
234 unsigned i, b;
235
236 ✗ for (i = 0; i < s->rows; i++) {
237 ✗ b = get_bits1(gb);
238 ✗ if (b == 0) {
239 ✗ set_pos(s, i++, col, 0);
240 ✗ if (i >= s->rows)
241 ✗ break;
242 ✗ set_pos(s, i, col, 0);
243 ✗ continue;
244 }
245
246 ✗ b = get_bits1(gb);
247 ✗ if (b == 0) {
248 ✗ set_pos(s, i, col, 0);
249 ✗ continue;
250 }
251
252 ✗ b = get_bits1(gb);
253 ✗ if (b == 0) {
254 ✗ b = get_bits1(gb);
255 ✗ set_pos(s, i, col, map_1bit[b]);
256 ✗ continue;
257 }
258
259 ✗ b = get_bits(gb, 2);
260 ✗ set_pos(s, i, col, map_2bit_far[b]);
261 }
262 ✗ return 0;
263 }
264
265 ✗ static int k34(InterplayACMContext *s, unsigned ind, unsigned col)
266 {
267 ✗ GetBitContext *gb = &s->gb;
268 unsigned i, b;
269
270 ✗ for (i = 0; i < s->rows; i++) {
271 ✗ b = get_bits1(gb);
272 ✗ if (b == 0) {
273 ✗ set_pos(s, i, col, 0);
274 ✗ continue;
275 }
276
277 ✗ b = get_bits1(gb);
278 ✗ if (b == 0) {
279 ✗ b = get_bits1(gb);
280 ✗ set_pos(s, i, col, map_1bit[b]);
281 ✗ continue;
282 }
283
284 ✗ b = get_bits(gb, 2);
285 ✗ set_pos(s, i, col, map_2bit_far[b]);
286 }
287 ✗ return 0;
288 }
289
290 ✗ static int k45(InterplayACMContext *s, unsigned ind, unsigned col)
291 {
292 ✗ GetBitContext *gb = &s->gb;
293 unsigned i, b;
294
295 ✗ for (i = 0; i < s->rows; i++) {
296 ✗ b = get_bits1(gb);
297 ✗ if (b == 0) {
298 ✗ set_pos(s, i, col, 0); i++;
299 ✗ if (i >= s->rows)
300 ✗ break;
301 ✗ set_pos(s, i, col, 0);
302 ✗ continue;
303 }
304
305 ✗ b = get_bits1(gb);
306 ✗ if (b == 0) {
307 ✗ set_pos(s, i, col, 0);
308 ✗ continue;
309 }
310
311 ✗ b = get_bits(gb, 3);
312 ✗ set_pos(s, i, col, map_3bit[b]);
313 }
314 ✗ return 0;
315 }
316
317 ✗ static int k44(InterplayACMContext *s, unsigned ind, unsigned col)
318 {
319 ✗ GetBitContext *gb = &s->gb;
320 unsigned i, b;
321
322 ✗ for (i = 0; i < s->rows; i++) {
323 ✗ b = get_bits1(gb);
324 ✗ if (b == 0) {
325 ✗ set_pos(s, i, col, 0);
326 ✗ continue;
327 }
328
329 ✗ b = get_bits(gb, 3);
330 ✗ set_pos(s, i, col, map_3bit[b]);
331 }
332 ✗ return 0;
333 }
334
335 ✗ static int t15(InterplayACMContext *s, unsigned ind, unsigned col)
336 {
337 ✗ GetBitContext *gb = &s->gb;
338 unsigned i, b;
339 int n1, n2, n3;
340
341 ✗ for (i = 0; i < s->rows; i++) {
342 /* b = (x1) + (x2 * 3) + (x3 * 9) */
343 ✗ b = get_bits(gb, 5);
344 ✗ if (b > 26) {
345 ✗ av_log(NULL, AV_LOG_ERROR, "Too large b = %d > 26\n", b);
346 ✗ return AVERROR_INVALIDDATA;
347 }
348
349 ✗ n1 = (mul_3x3[b] & 0x0F) - 1;
350 ✗ n2 = ((mul_3x3[b] >> 4) & 0x0F) - 1;
351 ✗ n3 = ((mul_3x3[b] >> 8) & 0x0F) - 1;
352
353 ✗ set_pos(s, i++, col, n1);
354 ✗ if (i >= s->rows)
355 ✗ break;
356 ✗ set_pos(s, i++, col, n2);
357 ✗ if (i >= s->rows)
358 ✗ break;
359 ✗ set_pos(s, i, col, n3);
360 }
361 ✗ return 0;
362 }
363
364 ✗ static int t27(InterplayACMContext *s, unsigned ind, unsigned col)
365 {
366 ✗ GetBitContext *gb = &s->gb;
367 unsigned i, b;
368 int n1, n2, n3;
369
370 ✗ for (i = 0; i < s->rows; i++) {
371 /* b = (x1) + (x2 * 5) + (x3 * 25) */
372 ✗ b = get_bits(gb, 7);
373 ✗ if (b > 124) {
374 ✗ av_log(NULL, AV_LOG_ERROR, "Too large b = %d > 124\n", b);
375 ✗ return AVERROR_INVALIDDATA;
376 }
377
378 ✗ n1 = (mul_3x5[b] & 0x0F) - 2;
379 ✗ n2 = ((mul_3x5[b] >> 4) & 0x0F) - 2;
380 ✗ n3 = ((mul_3x5[b] >> 8) & 0x0F) - 2;
381
382 ✗ set_pos(s, i++, col, n1);
383 ✗ if (i >= s->rows)
384 ✗ break;
385 ✗ set_pos(s, i++, col, n2);
386 ✗ if (i >= s->rows)
387 ✗ break;
388 ✗ set_pos(s, i, col, n3);
389 }
390 ✗ return 0;
391 }
392
393 ✗ static int t37(InterplayACMContext *s, unsigned ind, unsigned col)
394 {
395 ✗ GetBitContext *gb = &s->gb;
396 unsigned i, b;
397 int n1, n2;
398 ✗ for (i = 0; i < s->rows; i++) {
399 /* b = (x1) + (x2 * 11) */
400 ✗ b = get_bits(gb, 7);
401 ✗ if (b > 120) {
402 ✗ av_log(NULL, AV_LOG_ERROR, "Too large b = %d > 120\n", b);
403 ✗ return AVERROR_INVALIDDATA;
404 }
405
406 ✗ n1 = (mul_2x11[b] & 0x0F) - 5;
407 ✗ n2 = ((mul_2x11[b] >> 4) & 0x0F) - 5;
408
409 ✗ set_pos(s, i++, col, n1);
410 ✗ if (i >= s->rows)
411 ✗ break;
412 ✗ set_pos(s, i, col, n2);
413 }
414 ✗ return 0;
415 }
416
417 typedef int (*filler)(InterplayACMContext *s, unsigned ind, unsigned col);
418
419 static const filler filler_list[] = {
420 zero, bad, bad, linear,
421 linear, linear, linear, linear,
422 linear, linear, linear, linear,
423 linear, linear, linear, linear,
424 linear, k13, k12, t15,
425 k24, k23, t27, k35,
426 k34, bad, k45, k44,
427 bad, t37, bad, bad,
428 };
429
430 ✗ static int fill_block(InterplayACMContext *s)
431 {
432 ✗ GetBitContext *gb = &s->gb;
433 unsigned i, ind;
434 int ret;
435
436 ✗ for (i = 0; i < s->cols; i++) {
437 ✗ ind = get_bits(gb, 5);
438 ✗ ret = filler_list[ind](s, ind, i);
439 ✗ if (ret < 0)
440 ✗ return ret;
441 }
442 ✗ return 0;
443 }
444
445 ✗ static void juggle(int *wrap_p, int *block_p, unsigned sub_len, unsigned sub_count)
446 {
447 unsigned i, j;
448 int *p;
449 unsigned int r0, r1, r2, r3;
450
451 ✗ for (i = 0; i < sub_len; i++) {
452 ✗ p = block_p;
453 ✗ r0 = wrap_p[0];
454 ✗ r1 = wrap_p[1];
455 ✗ for (j = 0; j < sub_count/2; j++) {
456 ✗ r2 = *p;
457 ✗ *p = r1 * 2 + (r0 + r2);
458 ✗ p += sub_len;
459 ✗ r3 = *p;
460 ✗ *p = r2 * 2 - (r1 + r3);
461 ✗ p += sub_len;
462 ✗ r0 = r2;
463 ✗ r1 = r3;
464 }
465
466 ✗ *wrap_p++ = r0;
467 ✗ *wrap_p++ = r1;
468 ✗ block_p++;
469 }
470 }
471
472 ✗ static void juggle_block(InterplayACMContext *s)
473 {
474 unsigned sub_count, sub_len, todo_count, step_subcount, i;
475 int *wrap_p, *block_p, *p;
476
477 /* juggle only if subblock_len > 1 */
478 ✗ if (s->level == 0)
479 ✗ return;
480
481 /* 2048 / subblock_len */
482 ✗ if (s->level > 9)
483 ✗ step_subcount = 1;
484 else
485 ✗ step_subcount = (2048 >> s->level) - 2;
486
487 /* Apply juggle() (rows)x(cols)
488 * from (step_subcount * 2) x (subblock_len/2)
489 * to (step_subcount * subblock_len) x (1)
490 */
491 ✗ todo_count = s->rows;
492 ✗ block_p = s->block;
493 while (1) {
494 ✗ wrap_p = s->wrapbuf;
495 ✗ sub_count = step_subcount;
496 ✗ if (sub_count > todo_count)
497 ✗ sub_count = todo_count;
498
499 ✗ sub_len = s->cols / 2;
500 ✗ sub_count *= 2;
501
502 ✗ juggle(wrap_p, block_p, sub_len, sub_count);
503 ✗ wrap_p += sub_len * 2;
504
505 ✗ for (i = 0, p = block_p; i < sub_count; i++) {
506 ✗ p[0]++;
507 ✗ p += sub_len;
508 }
509
510 ✗ while (sub_len > 1) {
511 ✗ sub_len /= 2;
512 ✗ sub_count *= 2;
513 ✗ juggle(wrap_p, block_p, sub_len, sub_count);
514 ✗ wrap_p += sub_len * 2;
515 }
516
517 ✗ if (todo_count <= step_subcount)
518 ✗ break;
519
520 ✗ todo_count -= step_subcount;
521 ✗ block_p += step_subcount << s->level;
522 }
523 }
524
525 ✗ static int decode_block(InterplayACMContext *s)
526 {
527 ✗ GetBitContext *gb = &s->gb;
528 int pwr, count, val, i, x, ret;
529
530 ✗ pwr = get_bits(gb, 4);
531 ✗ val = get_bits(gb, 16);
532
533 ✗ count = 1 << pwr;
534
535 ✗ for (i = 0, x = 0; i < count; i++) {
536 ✗ s->midbuf[i] = x;
537 ✗ x += val;
538 }
539
540 ✗ for (i = 1, x = -val; i <= count; i++) {
541 ✗ s->midbuf[-i] = x;
542 ✗ x -= (unsigned)val;
543 }
544
545 ✗ ret = fill_block(s);
546 ✗ if (ret < 0)
547 ✗ return ret;
548
549 ✗ juggle_block(s);
550
551 ✗ return 0;
552 }
553
554 ✗ static int decode_frame(AVCodecContext *avctx, void *data,
555 int *got_frame_ptr, AVPacket *pkt)
556 {
557 ✗ InterplayACMContext *s = avctx->priv_data;
558 ✗ GetBitContext *gb = &s->gb;
559 ✗ AVFrame *frame = data;
560 const uint8_t *buf;
561 int16_t *samples;
562 int ret, n, buf_size, input_buf_size;
563
564 ✗ if (!pkt->size && !s->bitstream_size) {
565 ✗ *got_frame_ptr = 0;
566 ✗ return 0;
567 }
568
569 ✗ buf_size = FFMIN(pkt->size, s->max_framesize - s->bitstream_size);
570 ✗ input_buf_size = buf_size;
571 ✗ if (s->bitstream_index + s->bitstream_size + buf_size > s->max_framesize) {
572 ✗ memmove(s->bitstream, &s->bitstream[s->bitstream_index], s->bitstream_size);
573 ✗ s->bitstream_index = 0;
574 }
575 ✗ if (pkt->data)
576 ✗ memcpy(&s->bitstream[s->bitstream_index + s->bitstream_size], pkt->data, buf_size);
577 ✗ buf = &s->bitstream[s->bitstream_index];
578 ✗ buf_size += s->bitstream_size;
579 ✗ s->bitstream_size = buf_size;
580 ✗ if (buf_size < s->max_framesize && pkt->data) {
581 ✗ *got_frame_ptr = 0;
582 ✗ return input_buf_size;
583 }
584
585 ✗ if ((ret = init_get_bits8(gb, buf, buf_size)) < 0)
586 ✗ return ret;
587
588 ✗ frame->nb_samples = FFMIN(s->block_len / avctx->channels, s->max_samples);
589 ✗ s->max_samples -= FFMIN(frame->nb_samples, s->max_samples);
590 ✗ if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
591 ✗ return ret;
592
593 ✗ skip_bits(gb, s->skip);
594 ✗ ret = decode_block(s);
595 ✗ if (ret < 0)
596 ✗ return ret;
597
598 ✗ samples = (int16_t *)frame->data[0];
599 ✗ for (n = 0; n < frame->nb_samples * avctx->channels; n++) {
600 ✗ int val = s->block[n] >> s->level;
601 ✗ *samples++ = val;
602 }
603
604 ✗ *got_frame_ptr = 1;
605 ✗ s->skip = get_bits_count(gb) - 8 * (get_bits_count(gb) / 8);
606 ✗ n = get_bits_count(gb) / 8;
607
608 ✗ if (n > buf_size && pkt->data) {
609 ✗ s->bitstream_size = 0;
610 ✗ s->bitstream_index = 0;
611 ✗ return AVERROR_INVALIDDATA;
612 }
613
614 ✗ if (s->bitstream_size > 0) {
615 ✗ s->bitstream_index += n;
616 ✗ s->bitstream_size -= FFMIN(s->bitstream_size, n);
617 ✗ return input_buf_size;
618 }
619 ✗ return n;
620 }
621
622 ✗ static av_cold int decode_close(AVCodecContext *avctx)
623 {
624 ✗ InterplayACMContext *s = avctx->priv_data;
625
626 ✗ av_freep(&s->block);
627 ✗ av_freep(&s->wrapbuf);
628 ✗ av_freep(&s->ampbuf);
629 ✗ av_freep(&s->bitstream);
630 ✗ s->bitstream_size = 0;
631
632 ✗ return 0;
633 }
634
635 const AVCodec ff_interplay_acm_decoder = {
636 .name = "interplayacm",
637 .long_name = NULL_IF_CONFIG_SMALL("Interplay ACM"),
638 .type = AVMEDIA_TYPE_AUDIO,
639 .id = AV_CODEC_ID_INTERPLAY_ACM,
640 .init = decode_init,
641 .close = decode_close,
642 .decode = decode_frame,
643 .capabilities = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_DR1,
644 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
645 .priv_data_size = sizeof(InterplayACMContext),
646 };
647