FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/scpr.c
Date: 2026-09-25 11:37:27
Exec Total Coverage
Lines: 0 421 0.0%
Functions: 0 14 0.0%
Branches: 0 261 0.0%
Line Branch Exec Source
1 /*
2 * ScreenPressor decoder
3 *
4 * Copyright (c) 2017 Paul B Mahol
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 #include <string.h>
24
25 #include "libavutil/mem.h"
26 #include "avcodec.h"
27 #include "bytestream.h"
28 #include "codec_internal.h"
29 #include "decode.h"
30 #include "scpr.h"
31 #include "scpr3.h"
32
33 #define TOP 0x01000000
34 #define BOT 0x010000
35
36 #include "scpr3.c"
37
38 ✗ static void init_rangecoder(RangeCoder *rc, GetByteContext *gb)
39 {
40 ✗ rc->code1 = 0;
41 ✗ rc->range = 0xFFFFFFFFU;
42 ✗ rc->code = bytestream2_get_be32(gb);
43 ✗ }
44
45 ✗ static void reinit_tables(SCPRContext *s)
46 {
47 int comp, i, j;
48
49 ✗ for (comp = 0; comp < 3; comp++) {
50 ✗ for (j = 0; j < 4096; j++) {
51 ✗ if (s->pixel_model[comp][j].total_freq != 256) {
52 ✗ for (i = 0; i < 256; i++)
53 ✗ s->pixel_model[comp][j].freq[i] = 1;
54 ✗ for (i = 0; i < 16; i++)
55 ✗ s->pixel_model[comp][j].lookup[i] = 16;
56 ✗ s->pixel_model[comp][j].total_freq = 256;
57 }
58 }
59 }
60
61 ✗ for (j = 0; j < 6; j++) {
62 ✗ uint32_t *p = s->run_model[j];
63 ✗ for (i = 0; i < 256; i++)
64 ✗ p[i] = 1;
65 ✗ p[256] = 256;
66 }
67
68 ✗ for (j = 0; j < 6; j++) {
69 ✗ uint32_t *op = s->op_model[j];
70 ✗ for (i = 0; i < 6; i++)
71 ✗ op[i] = 1;
72 ✗ op[6] = 6;
73 }
74
75 ✗ for (i = 0; i < 256; i++) {
76 ✗ s->range_model[i] = 1;
77 ✗ s->count_model[i] = 1;
78 }
79 ✗ s->range_model[256] = 256;
80 ✗ s->count_model[256] = 256;
81
82 ✗ for (i = 0; i < 5; i++) {
83 ✗ s->fill_model[i] = 1;
84 }
85 ✗ s->fill_model[5] = 5;
86
87 ✗ for (j = 0; j < 4; j++) {
88 ✗ for (i = 0; i < 16; i++) {
89 ✗ s->sxy_model[j][i] = 1;
90 }
91 ✗ s->sxy_model[j][16] = 16;
92 }
93
94 ✗ for (i = 0; i < 512; i++) {
95 ✗ s->mv_model[0][i] = 1;
96 ✗ s->mv_model[1][i] = 1;
97 }
98 ✗ s->mv_model[0][512] = 512;
99 ✗ s->mv_model[1][512] = 512;
100 ✗ }
101
102 ✗ static int decode(GetByteContext *gb, RangeCoder *rc, uint32_t cumFreq, uint32_t freq, uint32_t total_freq)
103 {
104 ✗ rc->code -= cumFreq * rc->range;
105 ✗ rc->range *= freq;
106
107 ✗ while (rc->range < TOP && bytestream2_get_bytes_left(gb) > 0) {
108 ✗ uint32_t byte = bytestream2_get_byteu(gb);
109 ✗ rc->code = (rc->code << 8) | byte;
110 ✗ rc->range <<= 8;
111 }
112
113 ✗ return 0;
114 }
115
116 ✗ static int get_freq(RangeCoder *rc, uint32_t total_freq, uint32_t *freq)
117 {
118 ✗ if (total_freq == 0)
119 ✗ return AVERROR_INVALIDDATA;
120
121 ✗ rc->range = rc->range / total_freq;
122
123 ✗ if (rc->range == 0)
124 ✗ return AVERROR_INVALIDDATA;
125
126 ✗ *freq = rc->code / rc->range;
127
128 ✗ return 0;
129 }
130
131 ✗ static int decode0(GetByteContext *gb, RangeCoder *rc, uint32_t cumFreq, uint32_t freq, uint32_t total_freq)
132 {
133 uint32_t t;
134
135 ✗ if (total_freq == 0)
136 ✗ return AVERROR_INVALIDDATA;
137
138 ✗ t = rc->range * (uint64_t)cumFreq / total_freq;
139
140 ✗ rc->code1 += t + 1;
141 ✗ rc->range = rc->range * (uint64_t)(freq + cumFreq) / total_freq - (t + 1);
142
143 ✗ while (rc->range < TOP && bytestream2_get_bytes_left(gb) > 0) {
144 ✗ uint32_t byte = bytestream2_get_byteu(gb);
145 ✗ rc->code = (rc->code << 8) | byte;
146 ✗ rc->code1 <<= 8;
147 ✗ rc->range <<= 8;
148 }
149
150 ✗ return 0;
151 }
152
153 ✗ static int get_freq0(RangeCoder *rc, uint32_t total_freq, uint32_t *freq)
154 {
155 ✗ if (rc->range == 0)
156 ✗ return AVERROR_INVALIDDATA;
157
158 ✗ *freq = total_freq * (uint64_t)(rc->code - rc->code1) / rc->range;
159
160 ✗ return 0;
161 }
162
163 ✗ static int decode_value(SCPRContext *s, uint32_t *cnt, uint32_t maxc, uint32_t step, uint32_t *rval)
164 {
165 ✗ GetByteContext *gb = &s->gb;
166 ✗ RangeCoder *rc = &s->rc;
167 ✗ uint32_t totfr = cnt[maxc];
168 uint32_t value;
169 ✗ uint32_t c = 0, cumfr = 0, cnt_c = 0;
170 int i, ret;
171
172 ✗ if ((ret = s->get_freq(rc, totfr, &value)) < 0)
173 ✗ return ret;
174
175 ✗ while (c < maxc) {
176 ✗ cnt_c = cnt[c];
177 ✗ if (value >= cumfr + cnt_c)
178 ✗ cumfr += cnt_c;
179 else
180 ✗ break;
181 ✗ c++;
182 }
183
184 ✗ if (c >= maxc)
185 ✗ return AVERROR_INVALIDDATA;
186
187 ✗ if ((ret = s->decode(gb, rc, cumfr, cnt_c, totfr)) < 0)
188 ✗ return ret;
189
190 ✗ cnt[c] = cnt_c + step;
191 ✗ totfr += step;
192 ✗ if (totfr > BOT) {
193 ✗ totfr = 0;
194 ✗ for (i = 0; i < maxc; i++) {
195 ✗ uint32_t nc = (cnt[i] >> 1) + 1;
196 ✗ cnt[i] = nc;
197 ✗ totfr += nc;
198 }
199 }
200
201 ✗ cnt[maxc] = totfr;
202 ✗ *rval = c;
203
204 ✗ return 0;
205 }
206
207 ✗ static int decode_unit(SCPRContext *s, PixelModel *pixel, uint32_t step, uint32_t *rval)
208 {
209 ✗ GetByteContext *gb = &s->gb;
210 ✗ RangeCoder *rc = &s->rc;
211 ✗ uint32_t totfr = pixel->total_freq;
212 ✗ uint32_t value, x = 0, cumfr = 0, cnt_x = 0;
213 int i, j, ret, c, cnt_c;
214
215 ✗ if ((ret = s->get_freq(rc, totfr, &value)) < 0)
216 ✗ return ret;
217
218 ✗ while (x < 16) {
219 ✗ cnt_x = pixel->lookup[x];
220 ✗ if (value >= cumfr + cnt_x)
221 ✗ cumfr += cnt_x;
222 else
223 ✗ break;
224 ✗ x++;
225 }
226
227 ✗ c = x * 16;
228 ✗ cnt_c = 0;
229 ✗ while (c < 256) {
230 ✗ cnt_c = pixel->freq[c];
231 ✗ if (value >= cumfr + cnt_c)
232 ✗ cumfr += cnt_c;
233 else
234 ✗ break;
235 ✗ c++;
236 }
237 ✗ if (x >= 16 || c >= 256) {
238 ✗ return AVERROR_INVALIDDATA;
239 }
240
241 ✗ if ((ret = s->decode(gb, rc, cumfr, cnt_c, totfr)) < 0)
242 ✗ return ret;
243
244 ✗ pixel->freq[c] = cnt_c + step;
245 ✗ pixel->lookup[x] = cnt_x + step;
246 ✗ totfr += step;
247 ✗ if (totfr > BOT) {
248 ✗ totfr = 0;
249 ✗ for (i = 0; i < 256; i++) {
250 ✗ uint32_t nc = (pixel->freq[i] >> 1) + 1;
251 ✗ pixel->freq[i] = nc;
252 ✗ totfr += nc;
253 }
254 ✗ for (i = 0; i < 16; i++) {
255 ✗ uint32_t sum = 0;
256 ✗ uint32_t i16_17 = i << 4;
257 ✗ for (j = 0; j < 16; j++)
258 ✗ sum += pixel->freq[i16_17 + j];
259 ✗ pixel->lookup[i] = sum;
260 }
261 }
262 ✗ pixel->total_freq = totfr;
263
264 ✗ *rval = c & s->cbits;
265
266 ✗ return 0;
267 }
268
269 ✗ static int decode_units(SCPRContext *s, uint32_t *r, uint32_t *g, uint32_t *b,
270 int *cx, int *cx1)
271 {
272 ✗ const int cxshift = s->cxshift;
273 int ret;
274
275 ✗ ret = decode_unit(s, &s->pixel_model[0][*cx + *cx1], 400, r);
276 ✗ if (ret < 0)
277 ✗ return ret;
278
279 ✗ *cx1 = (*cx << 6) & 0xFC0;
280 ✗ *cx = *r >> cxshift;
281 ✗ ret = decode_unit(s, &s->pixel_model[1][*cx + *cx1], 400, g);
282 ✗ if (ret < 0)
283 ✗ return ret;
284
285 ✗ *cx1 = (*cx << 6) & 0xFC0;
286 ✗ *cx = *g >> cxshift;
287 ✗ ret = decode_unit(s, &s->pixel_model[2][*cx + *cx1], 400, b);
288 ✗ if (ret < 0)
289 ✗ return ret;
290
291 ✗ *cx1 = (*cx << 6) & 0xFC0;
292 ✗ *cx = *b >> cxshift;
293
294 ✗ return 0;
295 }
296
297 ✗ static int decompress_i(AVCodecContext *avctx, uint32_t *dst, int linesize)
298 {
299 ✗ SCPRContext *s = avctx->priv_data;
300 ✗ GetByteContext *gb = &s->gb;
301 ✗ int cx = 0, cx1 = 0, k = 0;
302 ✗ int run, off, y = 0, x = 0, ret;
303 ✗ uint32_t clr = 0, r, g, b, backstep = linesize - avctx->width;
304 uint32_t lx, ly, ptype;
305
306 ✗ reinit_tables(s);
307 ✗ bytestream2_skip(gb, 2);
308 ✗ init_rangecoder(&s->rc, gb);
309
310 ✗ while (k < avctx->width + 1) {
311 ✗ ret = decode_units(s, &r, &g, &b, &cx, &cx1);
312 ✗ if (ret < 0)
313 ✗ return ret;
314
315 ✗ ret = decode_value(s, s->run_model[0], 256, 400, &run);
316 ✗ if (ret < 0)
317 ✗ return ret;
318 ✗ if (run <= 0)
319 ✗ return AVERROR_INVALIDDATA;
320
321 ✗ clr = (b << 16) + (g << 8) + r;
322 ✗ k += run;
323 ✗ while (run-- > 0) {
324 ✗ if (y >= avctx->height)
325 ✗ return AVERROR_INVALIDDATA;
326
327 ✗ dst[y * linesize + x] = clr;
328 ✗ lx = x;
329 ✗ ly = y;
330 ✗ x++;
331 ✗ if (x >= avctx->width) {
332 ✗ x = 0;
333 ✗ y++;
334 }
335 }
336 }
337 ✗ off = -linesize - 1;
338 ✗ ptype = 0;
339
340 ✗ while (x < avctx->width && y < avctx->height) {
341 ✗ ret = decode_value(s, s->op_model[ptype], 6, 1000, &ptype);
342 ✗ if (ret < 0)
343 ✗ return ret;
344 ✗ if (ptype == 0) {
345 ✗ ret = decode_units(s, &r, &g, &b, &cx, &cx1);
346 ✗ if (ret < 0)
347 ✗ return ret;
348
349 ✗ clr = (b << 16) + (g << 8) + r;
350 }
351 ✗ if (ptype > 5)
352 ✗ return AVERROR_INVALIDDATA;
353 ✗ ret = decode_value(s, s->run_model[ptype], 256, 400, &run);
354 ✗ if (ret < 0)
355 ✗ return ret;
356 ✗ if (run <= 0)
357 ✗ return AVERROR_INVALIDDATA;
358
359 ✗ ret = decode_run_i(avctx, ptype, run, &x, &y, clr,
360 dst, linesize, &lx, &ly,
361 backstep, off, &cx, &cx1);
362 ✗ if (ret < 0)
363 ✗ return ret;
364 }
365
366 ✗ return 0;
367 }
368
369 ✗ static int decompress_p(AVCodecContext *avctx,
370 uint32_t *dst, int linesize,
371 uint32_t *prev, int plinesize)
372 {
373 ✗ SCPRContext *s = avctx->priv_data;
374 ✗ GetByteContext *gb = &s->gb;
375 ✗ int ret, temp = 0, min, max, x, y, cx = 0, cx1 = 0;
376 ✗ int backstep = linesize - avctx->width;
377
378 ✗ if (bytestream2_get_byte(gb) == 0)
379 ✗ return 1;
380 ✗ bytestream2_skip(gb, 1);
381 ✗ init_rangecoder(&s->rc, gb);
382
383 ✗ ret = decode_value(s, s->range_model, 256, 1, &min);
384 ✗ ret |= decode_value(s, s->range_model, 256, 1, &temp);
385 ✗ if (ret < 0)
386 ✗ return ret;
387
388 ✗ min += temp << 8;
389 ✗ ret = decode_value(s, s->range_model, 256, 1, &max);
390 ✗ ret |= decode_value(s, s->range_model, 256, 1, &temp);
391 ✗ if (ret < 0)
392 ✗ return ret;
393
394 ✗ max += temp << 8;
395 ✗ if (min > max || min >= s->nbcount)
396 ✗ return AVERROR_INVALIDDATA;
397
398 ✗ memset(s->blocks, 0, sizeof(*s->blocks) * s->nbcount);
399
400 ✗ while (min <= max) {
401 int fill, count;
402
403 ✗ ret = decode_value(s, s->fill_model, 5, 10, &fill);
404 ✗ ret |= decode_value(s, s->count_model, 256, 20, &count);
405 ✗ if (ret < 0)
406 ✗ return ret;
407 ✗ if (count <= 0)
408 ✗ return AVERROR_INVALIDDATA;
409
410 ✗ while (min < s->nbcount && count-- > 0) {
411 ✗ s->blocks[min++] = fill;
412 }
413 }
414
415 ✗ ret = av_frame_copy(s->current_frame, s->last_frame);
416 ✗ if (ret < 0)
417 ✗ return ret;
418
419 ✗ for (y = 0; y < s->nby; y++) {
420 ✗ for (x = 0; x < s->nbx; x++) {
421 ✗ int sy1 = 0, sy2 = 16, sx1 = 0, sx2 = 16;
422
423 ✗ if (s->blocks[y * s->nbx + x] == 0)
424 ✗ continue;
425
426 ✗ if (((s->blocks[y * s->nbx + x] - 1) & 1) > 0) {
427 ✗ ret = decode_value(s, s->sxy_model[0], 16, 100, &sx1);
428 ✗ ret |= decode_value(s, s->sxy_model[1], 16, 100, &sy1);
429 ✗ ret |= decode_value(s, s->sxy_model[2], 16, 100, &sx2);
430 ✗ ret |= decode_value(s, s->sxy_model[3], 16, 100, &sy2);
431 ✗ if (ret < 0)
432 ✗ return ret;
433
434 ✗ sx2++;
435 ✗ sy2++;
436 }
437 ✗ if (((s->blocks[y * s->nbx + x] - 1) & 2) > 0) {
438 ✗ int i, j, by = y * 16, bx = x * 16;
439 int mvx, mvy;
440
441 ✗ ret = decode_value(s, s->mv_model[0], 512, 100, &mvx);
442 ✗ ret |= decode_value(s, s->mv_model[1], 512, 100, &mvy);
443 ✗ if (ret < 0)
444 ✗ return ret;
445
446 ✗ mvx -= 256;
447 ✗ mvy -= 256;
448
449 ✗ if (by + mvy + sy1 < 0 || bx + mvx + sx1 < 0 ||
450 ✗ by + mvy + sy1 >= avctx->height || bx + mvx + sx1 >= avctx->width)
451 ✗ return AVERROR_INVALIDDATA;
452
453 ✗ for (i = 0; i < sy2 - sy1 && (by + sy1 + i) < avctx->height && (by + mvy + sy1 + i) < avctx->height; i++) {
454 ✗ for (j = 0; j < sx2 - sx1 && (bx + sx1 + j) < avctx->width && (bx + mvx + sx1 + j) < avctx->width; j++) {
455 ✗ dst[(by + i + sy1) * linesize + bx + sx1 + j] = prev[(by + mvy + sy1 + i) * plinesize + bx + sx1 + mvx + j];
456 }
457 }
458 } else {
459 ✗ int run, bx = x * 16 + sx1, by = y * 16 + sy1;
460 ✗ uint32_t r, g, b, clr, ptype = 0;
461
462 ✗ if (bx >= avctx->width)
463 ✗ return AVERROR_INVALIDDATA;
464
465 ✗ for (; by < y * 16 + sy2 && by < avctx->height;) {
466 ✗ ret = decode_value(s, s->op_model[ptype], 6, 1000, &ptype);
467 ✗ if (ret < 0)
468 ✗ return ret;
469 ✗ if (ptype == 0) {
470 ✗ ret = decode_units(s, &r, &g, &b, &cx, &cx1);
471 ✗ if (ret < 0)
472 ✗ return ret;
473
474 ✗ clr = (b << 16) + (g << 8) + r;
475 }
476 ✗ if (ptype > 5)
477 ✗ return AVERROR_INVALIDDATA;
478 ✗ ret = decode_value(s, s->run_model[ptype], 256, 400, &run);
479 ✗ if (ret < 0)
480 ✗ return ret;
481 ✗ if (run <= 0)
482 ✗ return AVERROR_INVALIDDATA;
483
484 ✗ ret = decode_run_p(avctx, ptype, run, x, y, clr,
485 dst, prev, linesize, plinesize, &bx, &by,
486 backstep, sx1, sx2, &cx, &cx1);
487 ✗ if (ret < 0)
488 ✗ return ret;
489 }
490 }
491 }
492 }
493
494 ✗ return 0;
495 }
496
497 ✗ static int decode_frame(AVCodecContext *avctx, AVFrame *frame,
498 int *got_frame, AVPacket *avpkt)
499 {
500 ✗ SCPRContext *s = avctx->priv_data;
501 ✗ GetByteContext *gb = &s->gb;
502 int ret, type;
503
504 ✗ if (avctx->bits_per_coded_sample == 16) {
505 ✗ if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
506 ✗ return ret;
507 }
508
509 ✗ if ((ret = ff_reget_buffer(avctx, s->current_frame, 0)) < 0)
510 ✗ return ret;
511
512 ✗ bytestream2_init(gb, avpkt->data, avpkt->size);
513
514 ✗ type = bytestream2_peek_byte(gb);
515
516 ✗ if (type == 2) {
517 ✗ s->version = 1;
518 ✗ s->get_freq = get_freq0;
519 ✗ s->decode = decode0;
520 ✗ frame->flags |= AV_FRAME_FLAG_KEY;
521 ✗ ret = decompress_i(avctx, (uint32_t *)s->current_frame->data[0],
522 ✗ s->current_frame->linesize[0] / 4);
523 ✗ } else if (type == 18) {
524 ✗ s->version = 2;
525 ✗ s->get_freq = get_freq;
526 ✗ s->decode = decode;
527 ✗ frame->flags |= AV_FRAME_FLAG_KEY;
528 ✗ ret = decompress_i(avctx, (uint32_t *)s->current_frame->data[0],
529 ✗ s->current_frame->linesize[0] / 4);
530 ✗ } else if (type == 34) {
531 ✗ frame->flags |= AV_FRAME_FLAG_KEY;
532 ✗ s->version = 3;
533 ✗ ret = decompress_i3(avctx, (uint32_t *)s->current_frame->data[0],
534 ✗ s->current_frame->linesize[0] / 4);
535 ✗ } else if (type == 17 || type == 33) {
536 ✗ uint32_t clr, *dst = (uint32_t *)s->current_frame->data[0];
537 int y;
538
539 ✗ if (bytestream2_get_bytes_left(gb) < 3)
540 ✗ return AVERROR_INVALIDDATA;
541
542 ✗ frame->flags |= AV_FRAME_FLAG_KEY;
543 ✗ bytestream2_skip(gb, 1);
544 ✗ if (avctx->bits_per_coded_sample == 16) {
545 ✗ uint16_t value = bytestream2_get_le16(gb);
546 int r, g, b;
547
548 ✗ r = (value ) & 31;
549 ✗ g = (value >> 5) & 31;
550 ✗ b = (value >> 10) & 31;
551 ✗ clr = (r << 16) + (g << 8) + b;
552 } else {
553 ✗ clr = bytestream2_get_le24(gb);
554 }
555 ✗ for (y = 0; y < avctx->height; y++) {
556 ✗ dst[0] = clr;
557 ✗ av_memcpy_backptr((uint8_t*)(dst+1), 4, 4*avctx->width - 4);
558 ✗ dst += s->current_frame->linesize[0] / 4;
559 }
560 ✗ } else if (type == 0 || type == 1) {
561 ✗ frame->flags &= ~AV_FRAME_FLAG_KEY;
562
563 ✗ if (s->version == 1 || s->version == 2)
564 ✗ ret = decompress_p(avctx, (uint32_t *)s->current_frame->data[0],
565 ✗ s->current_frame->linesize[0] / 4,
566 ✗ (uint32_t *)s->last_frame->data[0],
567 ✗ s->last_frame->linesize[0] / 4);
568 else
569 ✗ ret = decompress_p3(avctx, (uint32_t *)s->current_frame->data[0],
570 ✗ s->current_frame->linesize[0] / 4,
571 ✗ (uint32_t *)s->last_frame->data[0],
572 ✗ s->last_frame->linesize[0] / 4);
573 ✗ if (ret == 1)
574 ✗ return avpkt->size;
575 } else {
576 ✗ return AVERROR_PATCHWELCOME;
577 }
578
579 ✗ if (ret < 0)
580 ✗ return ret;
581
582 ✗ if (bytestream2_get_bytes_left(gb) > 5)
583 ✗ return AVERROR_INVALIDDATA;
584
585 ✗ if (avctx->bits_per_coded_sample != 16) {
586 ✗ ret = av_frame_ref(frame, s->current_frame);
587 ✗ if (ret < 0)
588 ✗ return ret;
589 } else {
590 ✗ uint8_t *dst = frame->data[0];
591 int x, y;
592
593 ✗ ret = av_frame_copy(frame, s->current_frame);
594 ✗ if (ret < 0)
595 ✗ return ret;
596
597 // scale up each sample by 8
598 ✗ for (y = 0; y < avctx->height; y++) {
599 // If the image is sufficiently aligned, compute 8 samples at once
600 ✗ if (!(((uintptr_t)dst) & 7)) {
601 ✗ uint64_t *dst64 = (uint64_t *)dst;
602 ✗ int w = avctx->width>>1;
603 ✗ for (x = 0; x < w; x++) {
604 ✗ dst64[x] = (dst64[x] << 3) & 0xFCFCFCFCFCFCFCFCULL;
605 }
606 ✗ x *= 8;
607 } else
608 ✗ x = 0;
609 ✗ for (; x < avctx->width * 4; x++) {
610 ✗ dst[x] = dst[x] << 3;
611 }
612 ✗ dst += frame->linesize[0];
613 }
614 }
615
616 ✗ frame->pict_type = (frame->flags & AV_FRAME_FLAG_KEY) ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
617
618 ✗ FFSWAP(AVFrame *, s->current_frame, s->last_frame);
619
620 ✗ frame->data[0] += frame->linesize[0] * (avctx->height - 1);
621 ✗ frame->linesize[0] *= -1;
622
623 ✗ *got_frame = 1;
624
625 ✗ return avpkt->size;
626 }
627
628 ✗ static av_cold int decode_init(AVCodecContext *avctx)
629 {
630 ✗ SCPRContext *s = avctx->priv_data;
631
632 ✗ switch (avctx->bits_per_coded_sample) {
633 ✗ case 16: avctx->pix_fmt = AV_PIX_FMT_RGB0; break;
634 ✗ case 24:
635 ✗ case 32: avctx->pix_fmt = AV_PIX_FMT_BGR0; break;
636 ✗ default:
637 ✗ av_log(avctx, AV_LOG_ERROR, "Unsupported bitdepth %i\n", avctx->bits_per_coded_sample);
638 ✗ return AVERROR_INVALIDDATA;
639 }
640
641 ✗ s->get_freq = get_freq0;
642 ✗ s->decode = decode0;
643
644 ✗ s->cxshift = avctx->bits_per_coded_sample == 16 ? 0 : 2;
645 ✗ s->cbits = avctx->bits_per_coded_sample == 16 ? 0x1F : 0xFF;
646 ✗ s->nbx = (avctx->width + 15) / 16;
647 ✗ s->nby = (avctx->height + 15) / 16;
648 ✗ s->nbcount = s->nbx * s->nby;
649 ✗ s->blocks = av_malloc_array(s->nbcount, sizeof(*s->blocks));
650 ✗ if (!s->blocks)
651 ✗ return AVERROR(ENOMEM);
652
653 ✗ s->last_frame = av_frame_alloc();
654 ✗ s->current_frame = av_frame_alloc();
655 ✗ if (!s->last_frame || !s->current_frame)
656 ✗ return AVERROR(ENOMEM);
657
658 ✗ return 0;
659 }
660
661 ✗ static av_cold int decode_close(AVCodecContext *avctx)
662 {
663 ✗ SCPRContext *s = avctx->priv_data;
664
665 ✗ av_freep(&s->blocks);
666 ✗ av_frame_free(&s->last_frame);
667 ✗ av_frame_free(&s->current_frame);
668
669 ✗ return 0;
670 }
671
672 const FFCodec ff_scpr_decoder = {
673 .p.name = "scpr",
674 CODEC_LONG_NAME("ScreenPressor"),
675 .p.type = AVMEDIA_TYPE_VIDEO,
676 .p.id = AV_CODEC_ID_SCPR,
677 .priv_data_size = sizeof(SCPRContext),
678 .init = decode_init,
679 .close = decode_close,
680 FF_CODEC_DECODE_CB(decode_frame),
681 .p.capabilities = AV_CODEC_CAP_DR1,
682 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
683 };
684