FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/scpr3.c
Date: 2021-09-23 20:34:37
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1 /*
2 * ScreenPressor version 3 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 <stdio.h>
24 #include <stdlib.h>
25 #include <string.h>
26
27 #include "libavutil/qsort.h"
28
29 #include "avcodec.h"
30 #include "bytestream.h"
31 #include "internal.h"
32 #include "scpr.h"
33
34 ✗ static void renew_table3(uint32_t nsym, uint32_t *cntsum,
35 uint16_t *freqs, uint16_t *freqs1,
36 uint16_t *cnts, uint8_t *dectab)
37 {
38 ✗ uint32_t a = 0, b = 4096 / nsym, c = b - (b >> 1);
39
40 ✗ *cntsum = c * nsym;
41
42 ✗ for (int d = 0; d < nsym; d++) {
43 ✗ freqs[d] = b;
44 ✗ freqs1[d] = a;
45 ✗ cnts[d] = c;
46 ✗ for (int q = a + 128 - 1 >> 7, f = (a + b - 1 >> 7) + 1; q < f; q++)
47 ✗ dectab[q] = d;
48
49 ✗ a += b;
50 }
51 }
52
53 ✗ static void reinit_tables3(SCPRContext * s)
54 {
55 ✗ for (int i = 0; i < 3; i++) {
56 ✗ for (int j = 0; j < 4096; j++) {
57 ✗ PixelModel3 *m = &s->pixel_model3[i][j];
58 ✗ m->type = 0;
59 }
60 }
61
62 ✗ for (int i = 0; i < 6; i++) {
63 ✗ renew_table3(256, &s->run_model3[i].cntsum,
64 ✗ s->run_model3[i].freqs[0], s->run_model3[i].freqs[1],
65 ✗ s->run_model3[i].cnts, s->run_model3[i].dectab);
66 }
67
68 ✗ renew_table3(256, &s->range_model3.cntsum,
69 ✗ s->range_model3.freqs[0], s->range_model3.freqs[1],
70 ✗ s->range_model3.cnts, s->range_model3.dectab);
71
72 ✗ renew_table3(5, &s->fill_model3.cntsum,
73 ✗ s->fill_model3.freqs[0], s->fill_model3.freqs[1],
74 ✗ s->fill_model3.cnts, s->fill_model3.dectab);
75
76 ✗ renew_table3(256, &s->count_model3.cntsum,
77 ✗ s->count_model3.freqs[0], s->count_model3.freqs[1],
78 ✗ s->count_model3.cnts, s->count_model3.dectab);
79
80 ✗ for (int i = 0; i < 4; i++) {
81 ✗ renew_table3(16, &s->sxy_model3[i].cntsum,
82 ✗ s->sxy_model3[i].freqs[0], s->sxy_model3[i].freqs[1],
83 ✗ s->sxy_model3[i].cnts, s->sxy_model3[i].dectab);
84 }
85
86 ✗ for (int i = 0; i < 2; i++) {
87 ✗ renew_table3(512, &s->mv_model3[i].cntsum,
88 ✗ s->mv_model3[i].freqs[0], s->mv_model3[i].freqs[1],
89 ✗ s->mv_model3[i].cnts, s->mv_model3[i].dectab);
90 }
91
92 ✗ for (int i = 0; i < 6; i++) {
93 ✗ renew_table3(6, &s->op_model3[i].cntsum,
94 ✗ s->op_model3[i].freqs[0], s->op_model3[i].freqs[1],
95 ✗ s->op_model3[i].cnts, s->op_model3[i].dectab);
96 }
97 }
98
99 ✗ static int decode3(GetByteContext *gb, RangeCoder *rc, uint32_t a, uint32_t b)
100 {
101 ✗ uint32_t code = a * (rc->code >> 12) + (rc->code & 0xFFF) - b;
102
103 ✗ while (code < 0x800000 && bytestream2_get_bytes_left(gb) > 0)
104 ✗ code = bytestream2_get_byteu(gb) | (code << 8);
105 ✗ rc->code = code;
106
107 ✗ return 0;
108 }
109
110 ✗ static void rescale(PixelModel3 *m, int *totfr)
111 {
112 uint32_t a;
113
114 ✗ a = 256 - m->size;
115 ✗ for (int b = 0; b < m->size; b++) {
116 ✗ m->freqs[b] -= m->freqs[b] >> 1;
117 ✗ a += m->freqs[b];
118 }
119
120 ✗ *totfr = a;
121 }
122
123 ✗ static int add_symbol(PixelModel3 *m, int index, uint32_t symbol, int *totfr, int max)
124 {
125 ✗ if (m->size == max)
126 ✗ return 0;
127
128 ✗ for (int c = m->size - 1; c >= index; c--) {
129 ✗ m->symbols[c + 1] = m->symbols[c];
130 ✗ m->freqs[c + 1] = m->freqs[c];
131 }
132
133 ✗ m->symbols[index] = symbol;
134 ✗ m->freqs[index] = 50;
135 ✗ m->size++;
136
137 ✗ if (m->maxpos >= index)
138 ✗ m->maxpos++;
139
140 ✗ *totfr += 50;
141 ✗ if (*totfr + 50 > 4096)
142 ✗ rescale(m, totfr);
143
144 ✗ return 1;
145 }
146
147 ✗ static int decode_adaptive45(PixelModel3 *m, int rccode, uint32_t *value,
148 uint16_t *a, uint16_t *b, uint32_t *c, int max)
149 {
150 ✗ uint32_t q, g, maxpos, d, e = *c, totfr = *c;
151 int ret;
152
153 ✗ for (d = 0; e <= 2048; d++)
154 ✗ e <<= 1;
155 ✗ maxpos = m->maxpos;
156 ✗ rccode >>= d;
157 ✗ *c = m->freqs[maxpos];
158 ✗ m->freqs[maxpos] += 4096 - e >> d;
159
160 ✗ for (q = 0, g = 0, e = 0; q < m->size; q++) {
161 ✗ uint32_t f = m->symbols[q];
162 ✗ uint32_t p = e + f - g;
163 ✗ uint32_t k = m->freqs[q];
164
165 ✗ if (rccode < p) {
166 ✗ *value = rccode - e + g;
167 ✗ *b = rccode << d;
168 ✗ *a = 1 << d;
169 ✗ m->freqs[maxpos] = *c;
170 ✗ ret = add_symbol(m, q, *value, &totfr, max);
171 ✗ *c = totfr;
172 ✗ return ret;
173 }
174
175 ✗ if (p + k > rccode) {
176 ✗ *value = f;
177 ✗ e += *value - g;
178 ✗ *b = e << d;
179 ✗ *a = k << d;
180 ✗ m->freqs[maxpos] = *c;
181 ✗ m->freqs[q] += 50;
182 ✗ totfr += 50;
183 ✗ if ((q != maxpos) && (m->freqs[q] > m->freqs[maxpos]))
184 ✗ m->maxpos = q;
185 ✗ if (totfr + 50 > 4096)
186 ✗ rescale(m, &totfr);
187 ✗ *c = totfr;
188 ✗ return 1;
189 }
190
191 ✗ e += f - g + k;
192 ✗ g = f + 1;
193 }
194
195 ✗ m->freqs[maxpos] = *c;
196 ✗ *value = g + rccode - e;
197 ✗ *b = rccode << d;
198 ✗ *a = 1 << d;
199 ✗ ret = add_symbol(m, q, *value, &totfr, max);
200 ✗ *c = totfr;
201 ✗ return ret;
202 }
203
204 ✗ static int update_model6_to_7(PixelModel3 *m)
205 {
206 ✗ PixelModel3 n = {0};
207 int c, d, e, f, k, p, length, i, j, index;
208 uint16_t *freqs, *freqs1, *cnts;
209
210 ✗ n.type = 7;
211
212 ✗ length = m->length;
213 ✗ freqs = n.freqs;
214 ✗ freqs1 = n.freqs1;
215 ✗ cnts = n.cnts;
216 ✗ n.cntsum = m->cnts[length];
217 ✗ for (i = 0; i < length; i++) {
218 ✗ if (!m->cnts[i])
219 ✗ continue;
220 ✗ index = m->symbols[i];
221 ✗ freqs[index] = m->freqs[2 * i];
222 ✗ freqs1[index] = m->freqs[2 * i + 1];
223 ✗ cnts[index] = m->cnts[i];
224 }
225 ✗ c = 1 << m->fshift;
226 ✗ d = c - (c >> 1);
227 ✗ for (j = 0, e = 0; j < 256; j++) {
228 ✗ f = freqs[j];
229 ✗ if (!f) {
230 ✗ f = c;
231 ✗ freqs[j] = c;
232 ✗ freqs1[j] = e;
233 ✗ cnts[j] = d;
234 }
235 ✗ p = (e + 127) >> 7;
236 ✗ k = ((f + e - 1) >> 7) + 1;
237 ✗ if (k > FF_ARRAY_ELEMS(n.dectab))
238 ✗ return AVERROR_INVALIDDATA;
239 ✗ for (i = 0; i < k - p; i++)
240 ✗ n.dectab[p + i] = j;
241 ✗ e += f;
242 }
243
244 ✗ memcpy(m, &n, sizeof(n));
245
246 ✗ return 0;
247 }
248
249 ✗ static void calc_sum(PixelModel3 *m)
250 {
251 uint32_t a;
252 int len;
253
254 ✗ len = m->length;
255 ✗ a = 256 - m->size << (m->fshift > 0 ? m->fshift - 1 : 0);
256 ✗ for (int c = 0; c < len; c++)
257 ✗ a += m->cnts[c];
258 ✗ m->cnts[len] = a;
259 }
260
261 ✗ static void rescale_dec(PixelModel3 *m)
262 {
263 ✗ uint16_t cnts[256] = {0};
264 ✗ uint16_t freqs[512] = {0};
265 int b, c, e, g;
266 uint32_t a;
267
268 ✗ for (a = 1 << (0 < m->fshift ? m->fshift - 1 : 0), b = 0; b < 256; b++)
269 ✗ cnts[b] = a;
270
271 ✗ for (a = 0, b = m->size; a < b; a++)
272 ✗ cnts[m->symbols[a]] = m->cnts[a];
273
274 ✗ for (b = a = 0; b < 256; b++) {
275 ✗ freqs[2 * b] = cnts[b];
276 ✗ freqs[2 * b + 1] = a;
277 ✗ a += cnts[b];
278 }
279
280 ✗ if (m->fshift > 0)
281 ✗ m->fshift--;
282
283 ✗ a = 256 - m->size << (0 < m->fshift ? m->fshift - 1 : 0);
284 ✗ for (b = 0, c = m->size; b < c; b++) {
285 ✗ m->cnts[b] -= m->cnts[b] >> 1;
286 ✗ a = a + m->cnts[b];
287 ✗ e = m->symbols[b];
288 ✗ g = freqs[2 * e + 1];
289 ✗ m->freqs[2 * b] = freqs[2 * e];
290 ✗ m->freqs[2 * b + 1] = g;
291 }
292 ✗ m->cnts[m->length] = a;
293 }
294
295 ✗ static int update_model5_to_6(PixelModel3 *m, uint8_t value)
296 {
297 ✗ PixelModel3 n = {0};
298 int c, d, e, f, g, k, q, p;
299
300 ✗ n.type = 6;
301 ✗ n.length = 32;
302
303 ✗ for (c = m->size, d = 256 - c, e = 0; e < c; e++)
304 ✗ d = d + m->freqs[e];
305
306 ✗ for (e = 0; d <= 2048; e++)
307 ✗ d <<= 1;
308
309 ✗ for (q = d = 0, g = q = 0; g < c; g++) {
310 ✗ p = m->symbols[g];
311 ✗ d = d + (p - q);
312 ✗ q = m->freqs[g];
313 ✗ k = q << e;
314 ✗ n.freqs[2 * g] = k;
315 ✗ n.freqs[2 * g + 1] = d << e;
316 ✗ n.cnts[g] = k - (k >> 1);
317 ✗ n.symbols[g] = p;
318 ✗ d += q;
319 ✗ q = p + 1;
320 }
321
322 ✗ n.fshift = e;
323 ✗ e = 1 << n.fshift;
324 ✗ d = 0;
325 ✗ if (value > 0) {
326 ✗ d = -1;
327 ✗ for (p = f = g = 0; p < c; p++) {
328 ✗ k = n.symbols[p];
329 ✗ if (k > d && k < value) {
330 ✗ d = k;
331 ✗ g = n.freqs[2 * p];
332 ✗ f = n.freqs[2 * p + 1];
333 }
334 }
335 ✗ d = 0 < g ? f + g + (value - d - 1 << n.fshift) : value << n.fshift;
336 }
337 ✗ n.freqs[2 * c] = e;
338 ✗ n.freqs[2 * c + 1] = d;
339 ✗ n.cnts[c] = e - (e >> 1);
340 ✗ n.symbols[c] = value;
341 ✗ n.size = c + 1;
342 ✗ e = 25 << n.fshift;
343 ✗ n.cnts[c] += e;
344 ✗ n.cnts[32] += e;
345 ✗ if (n.cnts[32] + e > 4096)
346 ✗ rescale_dec(&n);
347
348 ✗ calc_sum(&n);
349 ✗ for (c = 0, e = n.size - 1; c < e; c++) {
350 ✗ for (g = c + 1, f = n.size; g < f; g++) {
351 ✗ if (q = n.freqs[2 * g], k = n.freqs[2 * c], q > k) {
352 ✗ int l = n.freqs[2 * c + 1];
353 ✗ int h = n.freqs[2 * g + 1];
354 ✗ n.freqs[2 * c] = q;
355 ✗ n.freqs[2 * c + 1] = h;
356 ✗ n.freqs[2 * g] = k;
357 ✗ n.freqs[2 * g + 1] = l;
358 ✗ FFSWAP(uint16_t, n.cnts[c], n.cnts[g]);
359 ✗ FFSWAP(uint8_t, n.symbols[c], n.symbols[g]);
360 }
361 }
362 }
363
364 ✗ memcpy(m, &n, sizeof(n));
365
366 ✗ return 0;
367 }
368
369 ✗ static void grow_dec(PixelModel3 *m)
370 {
371 int a;
372
373 ✗ a = 2 * m->length;
374 ✗ m->cnts[2 * m->length] = m->cnts[m->length];
375 ✗ m->length = a;
376 }
377
378 ✗ static int add_dec(PixelModel3 *m, int sym, int f1, int f2)
379 {
380 int size;
381
382 ✗ if (m->size >= 40 || m->size >= m->length)
383 ✗ return -1;
384
385 ✗ size = m->size;
386 ✗ m->symbols[size] = sym;
387 ✗ m->freqs[2 * size] = f1;
388 ✗ m->freqs[2 * size + 1] = f2;
389 ✗ m->cnts[size] = f1 - (f1 >> 1);
390 ✗ m->size++;
391
392 ✗ return size;
393 }
394
395 ✗ static void incr_cntdec(PixelModel3 *m, int a)
396 {
397 int b, len, d, e, g;
398
399 ✗ b = 25 << m->fshift;
400 ✗ len = m->length;
401 ✗ m->cnts[a] += b;
402 ✗ m->cnts[len] += b;
403 ✗ if (a > 0 && m->cnts[a] > m->cnts[a - 1]) {
404 ✗ FFSWAP(uint16_t, m->cnts[a], m->cnts[a - 1]);
405 ✗ d = m->freqs[2 * a];
406 ✗ e = m->freqs[2 * a + 1];
407 ✗ g = m->freqs[2 * (a - 1) + 1];
408 ✗ m->freqs[2 * a] = m->freqs[2 * (a - 1)];
409 ✗ m->freqs[2 * a + 1] = g;
410 ✗ g = a - 1;
411 ✗ m->freqs[2 * g] = d;
412 ✗ m->freqs[2 * g + 1] = e;
413 ✗ FFSWAP(uint8_t, m->symbols[a], m->symbols[a - 1]);
414 }
415
416 ✗ if (m->cnts[len] + b > 4096)
417 ✗ rescale_dec(m);
418 }
419
420 ✗ static int decode_adaptive6(PixelModel3 *m, uint32_t code, uint32_t *value,
421 uint16_t *a, uint16_t *b)
422 {
423 int c, d, e, f, g, q;
424
425 ✗ for (c = 0, d = 0, e = 0, f = 0, g = 0, q = m->size; g < q; g++) {
426 ✗ uint32_t p = m->freqs[2 * g + 1];
427
428 ✗ if (p <= code) {
429 ✗ uint32_t k = m->freqs[2 * g];
430
431 ✗ if (p + k > code) {
432 ✗ *value = m->symbols[g];
433 ✗ *a = k;
434 ✗ *b = p;
435 ✗ incr_cntdec(m, g);
436 ✗ return 1;
437 }
438
439 ✗ if (p >= d) {
440 ✗ c = k;
441 ✗ d = p;
442 ✗ e = m->symbols[g];
443 }
444 }
445 }
446
447 ✗ g = 1 << m->fshift;
448 ✗ q = f = 0;
449
450 ✗ if (c > 0) {
451 ✗ f = code - (d + c) >> m->fshift;
452 ✗ q = f + e + 1;
453 ✗ f = d + c + (f << m->fshift);
454 } else {
455 ✗ q = code >> m->fshift;
456 ✗ f = q << m->fshift;
457 }
458
459 ✗ *a = g;
460 ✗ *b = f;
461 ✗ *value = q;
462
463 ✗ c = add_dec(m, q, g, f);
464 ✗ if (c < 0) {
465 ✗ if (m->length == 64)
466 ✗ return 0;
467 ✗ grow_dec(m);
468 ✗ c = add_dec(m, q, g, f);
469 }
470
471 ✗ incr_cntdec(m, c);
472 ✗ return 1;
473 }
474
475 ✗ static int cmpbytes(const void *p1, const void *p2)
476 {
477 ✗ int left = *(const uint8_t *)p1;
478 ✗ int right = *(const uint8_t *)p2;
479 ✗ return FFDIFFSIGN(left, right);
480 }
481
482 ✗ static int update_model1_to_2(PixelModel3 *m, uint32_t val)
483 {
484 ✗ PixelModel3 n = {0};
485 int i, b;
486
487 ✗ n.type = 2;
488 ✗ n.size = m->size + 1;
489 ✗ b = m->size;
490 ✗ for (i = 0; i < b; i++)
491 ✗ n.symbols[i] = m->symbols[i];
492 ✗ n.symbols[b] = val;
493
494 ✗ memcpy(m, &n, sizeof(n));
495
496 ✗ return 0;
497 }
498
499 ✗ static int update_model1_to_4(PixelModel3 *m, uint32_t val)
500 {
501 ✗ PixelModel3 n = {0};
502 int size, i;
503
504 ✗ size = m->size;
505 ✗ n.type = 4;
506 ✗ n.size = size;
507 ✗ for (i = 0; i < n.size; i++) {
508 ✗ n.symbols[i] = m->symbols[i];
509 }
510 ✗ AV_QSORT(n.symbols, size, uint8_t, cmpbytes);
511 ✗ for (i = 0; i < n.size; i++) {
512 ✗ if (val == n.symbols[i]) {
513 ✗ n.freqs[i] = 100;
514 ✗ n.maxpos = i;
515 } else {
516 ✗ n.freqs[i] = 50;
517 }
518 }
519
520 ✗ memcpy(m, &n, sizeof(n));
521
522 ✗ return 0;
523 }
524
525 ✗ static int update_model1_to_5(PixelModel3 *m, uint32_t val)
526 {
527 int i, size, freqs;
528 uint32_t a;
529
530 ✗ update_model1_to_4(m, val);
531 ✗ size = m->size;
532 ✗ a = 256 - size;
533 ✗ for (i = 0; i < size; i++, a += freqs)
534 ✗ freqs = m->freqs[i];
535 ✗ m->type = 5;
536 ✗ m->cntsum = a;
537
538 ✗ return 0;
539 }
540
541 ✗ static int decode_static1(PixelModel3 *m, uint32_t val)
542 {
543 uint32_t size;
544
545 ✗ size = m->size;
546 ✗ for (int i = 0; i < size; i++) {
547 ✗ if (val == m->symbols[i]) {
548 ✗ if (size <= 4)
549 ✗ return update_model1_to_4(m, val);
550 else
551 ✗ return update_model1_to_5(m, val);
552 }
553 }
554
555 ✗ if (size >= 14)
556 ✗ return update_model1_to_2(m, val);
557
558 ✗ m->symbols[size] = val;
559 ✗ m->size++;
560 ✗ return 0;
561 }
562
563 ✗ static int update_model2_to_6(PixelModel3 *m, uint8_t value, int a4)
564 {
565 ✗ PixelModel3 n = {0};
566 int c, d, e, f, g, q;
567
568 ✗ n.type = 6;
569 ✗ n.length = a4;
570
571 ✗ memset(n.symbols, 1u, a4);
572
573 ✗ c = m->size;
574 ✗ d = 256 - c + (64 * c + 64);
575 ✗ for (e = 0; d <= 2048; e++) {
576 ✗ d <<= 1;
577 }
578
579 ✗ g = q = 0;
580 ✗ AV_QSORT(m->symbols, c, uint8_t, cmpbytes);
581 ✗ for (f = d = 0; f < c; f++) {
582 ✗ int p = f;
583 ✗ int k = m->symbols[p];
584 int l;
585 ✗ g = g + (k - q);
586
587 ✗ if (k == value) {
588 ✗ d = p;
589 ✗ q = 128;
590 } else {
591 ✗ q = 64;
592 }
593 ✗ l = q << e;
594 ✗ n.freqs[2 * p] = l;
595 ✗ n.freqs[2 * p + 1] = g << e;
596 ✗ n.symbols[p] = k;
597 ✗ n.cnts[p] = l - (l >> 1);
598 ✗ g += q;
599 ✗ q = k + 1;
600 }
601 ✗ n.size = c;
602 ✗ n.fshift = e;
603 ✗ calc_sum(&n);
604
605 ✗ if (d > 0) {
606 ✗ c = n.freqs[0];
607 ✗ e = n.freqs[1];
608 ✗ g = n.freqs[2 * d + 1];
609 ✗ n.freqs[0] = n.freqs[2 * d];
610 ✗ n.freqs[1] = g;
611 ✗ n.freqs[2 * d] = c;
612 ✗ n.freqs[2 * d + 1] = e;
613 ✗ FFSWAP(uint16_t, n.cnts[0], n.cnts[d]);
614 ✗ FFSWAP(uint8_t, n.symbols[0], n.symbols[d]);
615 }
616
617 ✗ memcpy(m, &n, sizeof(n));
618
619 ✗ return 0;
620 }
621
622 ✗ static int update_model2_to_3(PixelModel3 *m, uint32_t val)
623 {
624 ✗ PixelModel3 n = {0};
625 uint32_t size;
626
627 ✗ n.type = 3;
628 ✗ n.size = m->size + 1;
629
630 ✗ size = m->size;
631 ✗ for (int i = 0; i < size; i++)
632 ✗ n.symbols[i] = m->symbols[i];
633 ✗ n.symbols[size] = val;
634
635 ✗ memcpy(m, &n, sizeof(n));
636
637 ✗ return 0;
638 }
639
640 ✗ static int decode_static2(PixelModel3 *m, uint32_t val)
641 {
642 uint32_t size;
643
644 ✗ size = m->size;
645 ✗ for (int i = 0; i < size; i++) {
646 ✗ if (val == m->symbols[i]) {
647 int a;
648
649 ✗ if (m->size <= 32)
650 ✗ a = 32;
651 else
652 ✗ a = 64;
653 ✗ return update_model2_to_6(m, val, a);
654 }
655 }
656
657 ✗ if (size >= 64)
658 ✗ return update_model2_to_3(m, val);
659
660 ✗ m->symbols[size] = val;
661 ✗ m->size++;
662
663 ✗ return 0;
664 }
665
666 ✗ static int update_model3_to_7(PixelModel3 *m, uint8_t value)
667 {
668 ✗ PixelModel3 n = {0};
669 int c, d, e, f, g, q;
670
671 ✗ n.type = 7;
672
673 ✗ for (c = 0; c < 256; c++) {
674 ✗ d = c;
675 ✗ n.freqs[d] = 1;
676 ✗ n.cnts[d] = 1;
677 }
678
679 ✗ for (c = m->size, d = (4096 - (256 - c)) / (c + 1) | 0, e = d - (d >> 1), g = 0; g < c;) {
680 ✗ q = g++;
681 ✗ q = m->symbols[q];
682 ✗ n.freqs[q] = d;
683 ✗ n.cnts[q] = e;
684 }
685 ✗ n.freqs[value] += d;
686 ✗ n.cnts[value] += 16;
687 ✗ for (d = c = n.cntsum = 0; 256 > d; d++) {
688 ✗ e = d;
689 ✗ n.cntsum += n.cnts[e];
690 ✗ n.freqs1[e] = c;
691 ✗ g = n.freqs[e];
692 ✗ f = (c + g - 1 >> 7) + 1;
693 ✗ if (f > FF_ARRAY_ELEMS(n.dectab))
694 ✗ return AVERROR_INVALIDDATA;
695 ✗ for (q = c + 128 - 1 >> 7; q < f; q++) {
696 ✗ n.dectab[q] = e;
697 }
698 ✗ c += g;
699 }
700
701 ✗ memcpy(m, &n, sizeof(n));
702
703 ✗ return 0;
704 }
705
706 ✗ static int decode_static3(PixelModel3 *m, uint32_t val)
707 {
708 ✗ uint32_t size = m->size;
709
710 ✗ for (int i = 0; i < size; i++) {
711 ✗ if (val == m->symbols[i])
712 ✗ return update_model3_to_7(m, val);
713 }
714
715 ✗ if (size >= 256)
716 ✗ return 0;
717
718 ✗ m->symbols[size] = val;
719 ✗ m->size++;
720 ✗ return 0;
721 }
722
723 ✗ static void sync_code3(GetByteContext *gb, RangeCoder *rc)
724 {
725 ✗ rc->code1++;
726 ✗ if (rc->code1 == 0x20000) {
727 ✗ rc->code = bytestream2_get_le32(gb);
728 ✗ rc->code1 = 0;
729 }
730 }
731
732 ✗ static int decode_value3(SCPRContext *s, uint32_t max, uint32_t *cntsum,
733 uint16_t *freqs1, uint16_t *freqs2,
734 uint16_t *cnts, uint8_t *dectable,
735 uint32_t *value)
736 {
737 ✗ GetByteContext *gb = &s->gb;
738 ✗ RangeCoder *rc = &s->rc;
739 uint32_t r, y, a, b, e, g, q;
740
741 ✗ r = dectable[(rc->code & 0xFFFu) >> 7];
742 ✗ if (r < max) {
743 ✗ while (freqs2[r + 1] <= (rc->code & 0xFFF)) {
744 ✗ if (++r >= max)
745 ✗ break;
746 }
747 }
748
749 ✗ if (r > max)
750 ✗ return AVERROR_INVALIDDATA;
751
752 ✗ cnts[r] += 16;
753 ✗ a = freqs1[r];
754 ✗ b = freqs2[r];
755 ✗ *cntsum += 16;
756 ✗ if (*cntsum + 16 > 4096) {
757 ✗ *cntsum = 0;
758 ✗ for (int c = 0, i = 0; i < max + 1; i++) {
759 ✗ e = cnts[i];
760 ✗ freqs2[i] = c;
761 ✗ freqs1[i] = e;
762 ✗ g = (c + 127) >> 7;
763 ✗ c += e;
764 ✗ q = ((c - 1) >> 7) + 1;
765 ✗ if (q > g) {
766 ✗ for (int j = 0; j < q - g; j++)
767 ✗ dectable[j + g] = i;
768 }
769 ✗ y = e - (e >> 1);
770 ✗ cnts[i] = y;
771 ✗ *cntsum += y;
772 }
773 }
774
775 ✗ decode3(gb, rc, a, b);
776 ✗ sync_code3(gb, rc);
777
778 ✗ *value = r;
779
780 ✗ return 0;
781 }
782
783 ✗ static void calc_sum5(PixelModel3 *m)
784 {
785 uint32_t a;
786
787 ✗ a = 256 - m->size;
788 ✗ for (int b = 0; b < m->size; b++)
789 ✗ a += m->freqs[b];
790 ✗ m->cntsum = a;
791 }
792
793 ✗ static int update_model4_to_5(PixelModel3 *m, uint32_t value)
794 {
795 ✗ PixelModel3 n = {0};
796 int c, e, g, totfr;
797
798 ✗ n.type = 5;
799
800 ✗ for (c = 0, e = 0; c < m->size && m->symbols[c] < value; c++) {
801 ✗ n.symbols[c] = m->symbols[c];
802 ✗ e += n.freqs[c] = m->freqs[c];
803 }
804
805 ✗ g = c;
806 ✗ n.symbols[g] = value;
807 ✗ e += n.freqs[g++] = 50;
808 ✗ for (; c < m->size; g++, c++) {
809 ✗ n.symbols[g] = m->symbols[c];
810 ✗ e += n.freqs[g] = m->freqs[c];
811 }
812 ✗ n.size = m->size + 1;
813 ✗ if (e > 4096)
814 ✗ rescale(&n, &totfr);
815
816 ✗ calc_sum5(&n);
817
818 ✗ memcpy(m, &n, sizeof(n));
819
820 ✗ return 0;
821 }
822
823 ✗ static int decode_unit3(SCPRContext *s, PixelModel3 *m, uint32_t code, uint32_t *value)
824 {
825 ✗ GetByteContext *gb = &s->gb;
826 ✗ RangeCoder *rc = &s->rc;
827 ✗ uint16_t a = 0, b = 0;
828 uint32_t param;
829 int type;
830 int ret;
831
832 ✗ type = m->type;
833 ✗ switch (type) {
834 ✗ case 0:
835 ✗ *value = bytestream2_get_byte(&s->gb);
836 ✗ m->type = 1;
837 ✗ m->size = 1;
838 ✗ m->symbols[0] = *value;
839 ✗ sync_code3(gb, rc);
840 ✗ break;
841 ✗ case 1:
842 ✗ *value = bytestream2_get_byte(&s->gb);
843 ✗ decode_static1(m, *value);
844 ✗ sync_code3(gb, rc);
845 ✗ break;
846 ✗ case 2:
847 ✗ *value = bytestream2_get_byte(&s->gb);
848 ✗ decode_static2(m, *value);
849 ✗ sync_code3(gb, rc);
850 ✗ break;
851 ✗ case 3:
852 ✗ *value = bytestream2_get_byte(&s->gb);
853 ✗ ret = decode_static3(m, *value);
854 ✗ if (ret < 0)
855 ✗ return AVERROR_INVALIDDATA;
856 ✗ sync_code3(gb, rc);
857 ✗ break;
858 ✗ case 4:
859 ✗ param = m->freqs[0] + m->freqs[1] + m->freqs[2] + m->freqs[3] + 256 - m->size;
860 ✗ if (!decode_adaptive45(m, code, value, &a, &b, &param, 4))
861 ✗ update_model4_to_5(m, *value);
862 ✗ decode3(gb, rc, a, b);
863 ✗ sync_code3(gb, rc);
864 ✗ break;
865 ✗ case 5:
866 ✗ if (!decode_adaptive45(m, code, value, &a, &b, &m->cntsum, 16))
867 ✗ update_model5_to_6(m, *value);
868 ✗ decode3(gb, rc, a, b);
869 ✗ sync_code3(gb, rc);
870 ✗ break;
871 ✗ case 6:
872 ✗ if (!decode_adaptive6(m, code, value, &a, &b)) {
873 ✗ ret = update_model6_to_7(m);
874 ✗ if (ret < 0)
875 ✗ return AVERROR_INVALIDDATA;
876 }
877 ✗ decode3(gb, rc, a, b);
878 ✗ sync_code3(gb, rc);
879 ✗ break;
880 ✗ case 7:
881 ✗ return decode_value3(s, 255, &m->cntsum,
882 ✗ m->freqs, m->freqs1,
883 ✗ m->cnts, m->dectab, value);
884 }
885
886 ✗ if (*value > 255)
887 ✗ return AVERROR_INVALIDDATA;
888
889 ✗ return 0;
890 }
891
892 ✗ static int decode_units3(SCPRContext * s, uint32_t *red,
893 uint32_t *green, uint32_t *blue,
894 int *cx, int *cx1)
895 {
896 ✗ RangeCoder *rc = &s->rc;
897 int ret;
898
899 ✗ ret = decode_unit3(s, &s->pixel_model3[0][*cx + *cx1], rc->code & 0xFFF, red);
900 ✗ if (ret < 0)
901 ✗ return ret;
902
903 ✗ *cx1 = (*cx << 6) & 0xFC0;
904 ✗ *cx = *red >> 2;
905
906 ✗ ret = decode_unit3(s, &s->pixel_model3[1][*cx + *cx1], rc->code & 0xFFF, green);
907 ✗ if (ret < 0)
908 ✗ return ret;
909
910 ✗ *cx1 = (*cx << 6) & 0xFC0;
911 ✗ *cx = *green >> 2;
912
913 ✗ ret = decode_unit3(s, &s->pixel_model3[2][*cx + *cx1], rc->code & 0xFFF, blue);
914 ✗ if (ret < 0)
915 ✗ return ret;
916
917 ✗ *cx1 = (*cx << 6) & 0xFC0;
918 ✗ *cx = *blue >> 2;
919
920 ✗ return 0;
921 }
922
923 ✗ static void init_rangecoder3(RangeCoder *rc, GetByteContext *gb)
924 {
925 ✗ rc->code = bytestream2_get_le32(gb);
926 ✗ rc->code1 = 0;
927 }
928
929 ✗ static int decompress_i3(AVCodecContext *avctx, uint32_t *dst, int linesize)
930 {
931 ✗ SCPRContext *s = avctx->priv_data;
932 ✗ GetByteContext *gb = &s->gb;
933 ✗ RangeCoder *rc = &s->rc;
934 ✗ int cx = 0, cx1 = 0, k = 0;
935 ✗ int run, off, y = 0, x = 0, ret;
936 ✗ uint32_t backstep = linesize - avctx->width;
937 ✗ uint32_t clr = 0, lx, ly, ptype, r, g, b;
938
939 ✗ bytestream2_skip(gb, 1);
940 ✗ init_rangecoder3(rc, gb);
941 ✗ reinit_tables3(s);
942
943 ✗ while (k < avctx->width + 1) {
944 ✗ ret = decode_units3(s, &r, &g, &b, &cx, &cx1);
945 ✗ if (ret < 0)
946 ✗ return ret;
947 ✗ ret = decode_value3(s, 255, &s->run_model3[0].cntsum,
948 ✗ s->run_model3[0].freqs[0],
949 ✗ s->run_model3[0].freqs[1],
950 ✗ s->run_model3[0].cnts,
951 ✗ s->run_model3[0].dectab, &run);
952 ✗ if (ret < 0)
953 ✗ return ret;
954 ✗ if (run <= 0)
955 ✗ return AVERROR_INVALIDDATA;
956
957 ✗ clr = (b << 16) + (g << 8) + r;
958 ✗ k += run;
959 ✗ while (run-- > 0) {
960 ✗ if (y >= avctx->height)
961 ✗ return AVERROR_INVALIDDATA;
962
963 ✗ dst[y * linesize + x] = clr;
964 ✗ lx = x;
965 ✗ ly = y;
966 ✗ x++;
967 ✗ if (x >= avctx->width) {
968 ✗ x = 0;
969 ✗ y++;
970 }
971 }
972 }
973 ✗ off = -linesize - 1;
974 ✗ ptype = 0;
975
976 ✗ while (x < avctx->width && y < avctx->height) {
977 ✗ ret = decode_value3(s, 5, &s->op_model3[ptype].cntsum,
978 ✗ s->op_model3[ptype].freqs[0],
979 ✗ s->op_model3[ptype].freqs[1],
980 ✗ s->op_model3[ptype].cnts,
981 ✗ s->op_model3[ptype].dectab, &ptype);
982 ✗ if (ret < 0)
983 ✗ return ret;
984 ✗ if (ptype == 0) {
985 ✗ ret = decode_units3(s, &r, &g, &b, &cx, &cx1);
986 ✗ if (ret < 0)
987 ✗ return ret;
988 ✗ clr = (b << 16) + (g << 8) + r;
989 }
990 ✗ if (ptype > 5)
991 ✗ return AVERROR_INVALIDDATA;
992 ✗ ret = decode_value3(s, 255, &s->run_model3[ptype].cntsum,
993 ✗ s->run_model3[ptype].freqs[0],
994 ✗ s->run_model3[ptype].freqs[1],
995 ✗ s->run_model3[ptype].cnts,
996 ✗ s->run_model3[ptype].dectab, &run);
997 ✗ if (ret < 0)
998 ✗ return ret;
999 ✗ if (run <= 0)
1000 ✗ return AVERROR_INVALIDDATA;
1001
1002 ✗ ret = decode_run_i(avctx, ptype, run, &x, &y, clr,
1003 dst, linesize, &lx, &ly,
1004 backstep, off, &cx, &cx1);
1005 ✗ if (ret < 0)
1006 ✗ return ret;
1007 }
1008
1009 ✗ return 0;
1010 }
1011
1012 ✗ static int decompress_p3(AVCodecContext *avctx,
1013 uint32_t *dst, int linesize,
1014 uint32_t *prev, int plinesize)
1015 {
1016 ✗ SCPRContext *s = avctx->priv_data;
1017 ✗ GetByteContext *gb = &s->gb;
1018 ✗ int ret, temp, min, max, x, y, cx = 0, cx1 = 0;
1019 ✗ int backstep = linesize - avctx->width;
1020 ✗ int mvx = 0, mvy = 0;
1021
1022 ✗ if (bytestream2_get_byte(gb) == 0)
1023 ✗ return 1;
1024 ✗ init_rangecoder3(&s->rc, gb);
1025
1026 ✗ ret = decode_value3(s, 255, &s->range_model3.cntsum,
1027 ✗ s->range_model3.freqs[0],
1028 ✗ s->range_model3.freqs[1],
1029 ✗ s->range_model3.cnts,
1030 ✗ s->range_model3.dectab, &min);
1031 ✗ ret |= decode_value3(s, 255, &s->range_model3.cntsum,
1032 ✗ s->range_model3.freqs[0],
1033 ✗ s->range_model3.freqs[1],
1034 ✗ s->range_model3.cnts,
1035 ✗ s->range_model3.dectab, &temp);
1036 ✗ if (ret < 0)
1037 ✗ return ret;
1038
1039 ✗ min += temp << 8;
1040 ✗ ret |= decode_value3(s, 255, &s->range_model3.cntsum,
1041 ✗ s->range_model3.freqs[0],
1042 ✗ s->range_model3.freqs[1],
1043 ✗ s->range_model3.cnts,
1044 ✗ s->range_model3.dectab, &max);
1045 ✗ ret |= decode_value3(s, 255, &s->range_model3.cntsum,
1046 ✗ s->range_model3.freqs[0],
1047 ✗ s->range_model3.freqs[1],
1048 ✗ s->range_model3.cnts,
1049 ✗ s->range_model3.dectab, &temp);
1050 ✗ if (ret < 0)
1051 ✗ return ret;
1052
1053 ✗ max += temp << 8;
1054 ✗ if (min > max || min >= s->nbcount)
1055 ✗ return AVERROR_INVALIDDATA;
1056
1057 ✗ memset(s->blocks, 0, sizeof(*s->blocks) * s->nbcount);
1058
1059 ✗ while (min <= max) {
1060 int fill, count;
1061
1062 ✗ ret = decode_value3(s, 4, &s->fill_model3.cntsum,
1063 ✗ s->fill_model3.freqs[0],
1064 ✗ s->fill_model3.freqs[1],
1065 ✗ s->fill_model3.cnts,
1066 ✗ s->fill_model3.dectab, &fill);
1067 ✗ ret |= decode_value3(s, 255, &s->count_model3.cntsum,
1068 ✗ s->count_model3.freqs[0],
1069 ✗ s->count_model3.freqs[1],
1070 ✗ s->count_model3.cnts,
1071 ✗ s->count_model3.dectab, &count);
1072 ✗ if (ret < 0)
1073 ✗ return ret;
1074 ✗ if (count <= 0)
1075 ✗ return AVERROR_INVALIDDATA;
1076
1077 ✗ while (min < s->nbcount && count-- > 0) {
1078 ✗ s->blocks[min++] = fill;
1079 }
1080 }
1081
1082 ✗ ret = av_frame_copy(s->current_frame, s->last_frame);
1083 ✗ if (ret < 0)
1084 ✗ return ret;
1085
1086 ✗ for (y = 0; y < s->nby; y++) {
1087 ✗ for (x = 0; x < s->nbx; x++) {
1088 ✗ int sy1 = 0, sy2 = 16, sx1 = 0, sx2 = 16;
1089
1090 ✗ if (s->blocks[y * s->nbx + x] == 0)
1091 ✗ continue;
1092
1093 ✗ if (((s->blocks[y * s->nbx + x] + 1) & 1) > 0) {
1094 ✗ ret = decode_value3(s, 15, &s->sxy_model3[0].cntsum,
1095 ✗ s->sxy_model3[0].freqs[0],
1096 ✗ s->sxy_model3[0].freqs[1],
1097 ✗ s->sxy_model3[0].cnts,
1098 ✗ s->sxy_model3[0].dectab, &sx1);
1099 ✗ ret |= decode_value3(s, 15, &s->sxy_model3[1].cntsum,
1100 ✗ s->sxy_model3[1].freqs[0],
1101 ✗ s->sxy_model3[1].freqs[1],
1102 ✗ s->sxy_model3[1].cnts,
1103 ✗ s->sxy_model3[1].dectab, &sy1);
1104 ✗ ret |= decode_value3(s, 15, &s->sxy_model3[2].cntsum,
1105 ✗ s->sxy_model3[2].freqs[0],
1106 ✗ s->sxy_model3[2].freqs[1],
1107 ✗ s->sxy_model3[2].cnts,
1108 ✗ s->sxy_model3[2].dectab, &sx2);
1109 ✗ ret |= decode_value3(s, 15, &s->sxy_model3[3].cntsum,
1110 ✗ s->sxy_model3[3].freqs[0],
1111 ✗ s->sxy_model3[3].freqs[1],
1112 ✗ s->sxy_model3[3].cnts,
1113 ✗ s->sxy_model3[3].dectab, &sy2);
1114 ✗ if (ret < 0)
1115 ✗ return ret;
1116
1117 ✗ sx2++;
1118 ✗ sy2++;
1119 }
1120 ✗ if (((s->blocks[y * s->nbx + x] + 3) & 2) > 0) {
1121 ✗ int i, a, b, c, j, by = y * 16, bx = x * 16;
1122 uint32_t code;
1123
1124 ✗ a = s->rc.code & 0xFFF;
1125 ✗ c = 1;
1126
1127 ✗ if (a < 0x800)
1128 ✗ c = 0;
1129 ✗ b = 2048;
1130 ✗ if (!c)
1131 ✗ b = 0;
1132
1133 ✗ code = a + ((s->rc.code >> 1) & 0xFFFFF800) - b;
1134 ✗ while (code < 0x800000 && bytestream2_get_bytes_left(gb) > 0)
1135 ✗ code = bytestream2_get_byteu(gb) | (code << 8);
1136 ✗ s->rc.code = code;
1137
1138 ✗ sync_code3(gb, &s->rc);
1139
1140 ✗ if (!c) {
1141 ✗ ret = decode_value3(s, 511, &s->mv_model3[0].cntsum,
1142 ✗ s->mv_model3[0].freqs[0],
1143 ✗ s->mv_model3[0].freqs[1],
1144 ✗ s->mv_model3[0].cnts,
1145 ✗ s->mv_model3[0].dectab, &mvx);
1146 ✗ ret |= decode_value3(s, 511, &s->mv_model3[1].cntsum,
1147 ✗ s->mv_model3[1].freqs[0],
1148 ✗ s->mv_model3[1].freqs[1],
1149 ✗ s->mv_model3[1].cnts,
1150 ✗ s->mv_model3[1].dectab, &mvy);
1151 ✗ if (ret < 0)
1152 ✗ return ret;
1153
1154 ✗ mvx -= 256;
1155 ✗ mvy -= 256;
1156 }
1157
1158 ✗ if (by + mvy + sy1 < 0 || bx + mvx + sx1 < 0 ||
1159 ✗ by + mvy + sy1 >= avctx->height || bx + mvx + sx1 >= avctx->width)
1160 ✗ return AVERROR_INVALIDDATA;
1161
1162 ✗ for (i = 0; i < sy2 - sy1 && (by + sy1 + i) < avctx->height && (by + mvy + sy1 + i) < avctx->height; i++) {
1163 ✗ for (j = 0; j < sx2 - sx1 && (bx + sx1 + j) < avctx->width && (bx + mvx + sx1 + j) < avctx->width; j++) {
1164 ✗ dst[(by + i + sy1) * linesize + bx + sx1 + j] = prev[(by + mvy + sy1 + i) * plinesize + bx + sx1 + mvx + j];
1165 }
1166 }
1167 } else {
1168 ✗ int run, bx = x * 16 + sx1, by = y * 16 + sy1;
1169 ✗ uint32_t clr, ptype = 0, r, g, b;
1170
1171 ✗ for (; by < y * 16 + sy2 && by < avctx->height;) {
1172 ✗ ret = decode_value3(s, 5, &s->op_model3[ptype].cntsum,
1173 ✗ s->op_model3[ptype].freqs[0],
1174 ✗ s->op_model3[ptype].freqs[1],
1175 ✗ s->op_model3[ptype].cnts,
1176 ✗ s->op_model3[ptype].dectab, &ptype);
1177 ✗ if (ret < 0)
1178 ✗ return ret;
1179 ✗ if (ptype == 0) {
1180 ✗ ret = decode_units3(s, &r, &g, &b, &cx, &cx1);
1181 ✗ if (ret < 0)
1182 ✗ return ret;
1183
1184 ✗ clr = (b << 16) + (g << 8) + r;
1185 }
1186 ✗ if (ptype > 5)
1187 ✗ return AVERROR_INVALIDDATA;
1188 ✗ ret = decode_value3(s, 255, &s->run_model3[ptype].cntsum,
1189 ✗ s->run_model3[ptype].freqs[0],
1190 ✗ s->run_model3[ptype].freqs[1],
1191 ✗ s->run_model3[ptype].cnts,
1192 ✗ s->run_model3[ptype].dectab, &run);
1193 ✗ if (ret < 0)
1194 ✗ return ret;
1195 ✗ if (run <= 0)
1196 ✗ return AVERROR_INVALIDDATA;
1197
1198 ✗ ret = decode_run_p(avctx, ptype, run, x, y, clr,
1199 dst, prev, linesize, plinesize, &bx, &by,
1200 backstep, sx1, sx2, &cx, &cx1);
1201 ✗ if (ret < 0)
1202 ✗ return ret;
1203 }
1204 }
1205 }
1206 }
1207
1208 ✗ return 0;
1209 }
1210