FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/fmvc.c
Date: 2021-09-24 20:55:06
Exec Total Coverage
Lines: 336 392 85.7%
Branches: 175 230 76.1%

Line Branch Exec Source
1 /*
2 * FM Screen Capture Codec 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 "avcodec.h"
28 #include "bytestream.h"
29 #include "internal.h"
30
31 #define BLOCK_HEIGHT 112u
32 #define BLOCK_WIDTH 84u
33
34 typedef struct InterBlock {
35 int w, h;
36 int size;
37 int xor;
38 } InterBlock;
39
40 typedef struct FMVCContext {
41 GetByteContext gb;
42 PutByteContext pb;
43 uint8_t *buffer;
44 size_t buffer_size;
45 uint8_t *pbuffer;
46 size_t pbuffer_size;
47 ptrdiff_t stride;
48 int bpp;
49 int yb, xb;
50 InterBlock *blocks;
51 unsigned nb_blocks;
52 } FMVCContext;
53
54 72 static int decode_type2(GetByteContext *gb, PutByteContext *pb)
55 {
56 72 unsigned repeat = 0, first = 1, opcode = 0;
57 int i, len, pos;
58
59
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4593 while (bytestream2_get_bytes_left(gb) > 0) {
60 GetByteContext gbc;
61
62
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33101 while (bytestream2_get_bytes_left(gb) > 0) {
63
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33101 if (first) {
64 72 first = 0;
65
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72 if (bytestream2_peek_byte(gb) > 17) {
66 72 len = bytestream2_get_byte(gb) - 17;
67
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72 if (len < 4) {
68 do {
69 65 bytestream2_put_byte(pb, bytestream2_get_byte(gb));
70 65 --len;
71
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65 } while (len);
72 65 opcode = bytestream2_peek_byte(gb);
73 65 continue;
74 } else {
75 do {
76 103 bytestream2_put_byte(pb, bytestream2_get_byte(gb));
77 103 --len;
78
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103 } while (len);
79 7 opcode = bytestream2_peek_byte(gb);
80
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7 if (opcode < 0x10) {
81 bytestream2_skip(gb, 1);
82 pos = - (opcode >> 2) - 4 * bytestream2_get_byte(gb) - 2049;
83
84 bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start);
85 bytestream2_seek(&gbc, bytestream2_tell_p(pb) + pos, SEEK_SET);
86
87 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
88 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
89 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
90 len = opcode & 3;
91 if (!len) {
92 repeat = 1;
93 } else {
94 do {
95 bytestream2_put_byte(pb, bytestream2_get_byte(gb));
96 --len;
97 } while (len);
98 opcode = bytestream2_peek_byte(gb);
99 }
100 continue;
101 }
102 }
103 7 repeat = 0;
104 }
105 7 repeat = 1;
106 }
107
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33036 if (repeat) {
108 26608 repeat = 0;
109 26608 opcode = bytestream2_peek_byte(gb);
110
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26608 if (opcode < 0x10) {
111 586 bytestream2_skip(gb, 1);
112
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586 if (!opcode) {
113
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82 if (!bytestream2_peek_byte(gb)) {
114 do {
115 bytestream2_skip(gb, 1);
116 opcode += 255;
117 } while (!bytestream2_peek_byte(gb) && bytestream2_get_bytes_left(gb) > 0);
118 }
119 82 opcode += bytestream2_get_byte(gb) + 15;
120 }
121 586 bytestream2_put_le32(pb, bytestream2_get_le32(gb));
122
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4212 for (i = opcode - 1; i > 0; --i)
123 3626 bytestream2_put_byte(pb, bytestream2_get_byte(gb));
124 586 opcode = bytestream2_peek_byte(gb);
125
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586 if (opcode < 0x10) {
126 28 bytestream2_skip(gb, 1);
127 28 pos = - (opcode >> 2) - 4 * bytestream2_get_byte(gb) - 2049;
128
129 28 bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start);
130 28 bytestream2_seek(&gbc, bytestream2_tell_p(pb) + pos, SEEK_SET);
131
132 28 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
133 28 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
134 28 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
135 28 len = opcode & 3;
136
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28 if (!len) {
137 22 repeat = 1;
138 } else {
139 do {
140 17 bytestream2_put_byte(pb, bytestream2_get_byte(gb));
141 17 --len;
142
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17 } while (len);
143 6 opcode = bytestream2_peek_byte(gb);
144 }
145 28 continue;
146 }
147 }
148 }
149
150
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33008 if (opcode >= 0x40) {
151 6293 bytestream2_skip(gb, 1);
152 6293 pos = - ((opcode >> 2) & 7) - 1 - 8 * bytestream2_get_byte(gb);
153 6293 len = (opcode >> 5) - 1;
154
155 6293 bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start);
156 6293 bytestream2_seek(&gbc, bytestream2_tell_p(pb) + pos, SEEK_SET);
157
158 6293 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
159 6293 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
160 do {
161 15169 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
162 15169 --len;
163
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15169 } while (len);
164
165 6293 len = opcode & 3;
166
167
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6293 if (!len) {
168 3620 repeat = 1;
169 } else {
170 do {
171 4856 bytestream2_put_byte(pb, bytestream2_get_byte(gb));
172 4856 --len;
173
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4856 } while (len);
174 2673 opcode = bytestream2_peek_byte(gb);
175 }
176 6293 continue;
177
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26715 } else if (opcode < 0x20) {
178 4593 break;
179 }
180 22122 len = opcode & 0x1F;
181 22122 bytestream2_skip(gb, 1);
182
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22122 if (!len) {
183
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7443 if (!bytestream2_peek_byte(gb)) {
184 do {
185 9973 bytestream2_skip(gb, 1);
186 9973 len += 255;
187
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9973 } while (!bytestream2_peek_byte(gb) && bytestream2_get_bytes_left(gb) > 0);
188 }
189 7443 len += bytestream2_get_byte(gb) + 31;
190 }
191 22122 i = bytestream2_get_le16(gb);
192 22122 pos = - (i >> 2) - 1;
193
194 22122 bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start);
195 22122 bytestream2_seek(&gbc, bytestream2_tell_p(pb) + pos, SEEK_SET);
196
197
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22122 if (len < 6 || bytestream2_tell_p(pb) - bytestream2_tell(&gbc) < 4) {
198 3050 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
199 3050 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
200 do {
201 1990991 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
202 1990991 --len;
203
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1990991 } while (len);
204 } else {
205 19072 bytestream2_put_le32(pb, bytestream2_get_le32(&gbc));
206
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1700600 for (len = len - 2; len; --len)
207 1681528 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
208 }
209 22122 len = i & 3;
210
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22122 if (!len) {
211 19401 repeat = 1;
212 } else {
213 do {
214 5082 bytestream2_put_byte(pb, bytestream2_get_byte(gb));
215 5082 --len;
216
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5082 } while (len);
217 2721 opcode = bytestream2_peek_byte(gb);
218 }
219 }
220 4593 bytestream2_skip(gb, 1);
221
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4593 if (opcode < 0x10) {
222 998 pos = -(opcode >> 2) - 1 - 4 * bytestream2_get_byte(gb);
223
224 998 bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start);
225 998 bytestream2_seek(&gbc, bytestream2_tell_p(pb) + pos, SEEK_SET);
226
227 998 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
228 998 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
229 998 len = opcode & 3;
230
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998 if (!len) {
231 371 repeat = 1;
232 } else {
233 do {
234 1101 bytestream2_put_byte(pb, bytestream2_get_byte(gb));
235 1101 --len;
236
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1101 } while (len);
237 627 opcode = bytestream2_peek_byte(gb);
238 }
239 998 continue;
240 }
241 3595 len = opcode & 7;
242
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3595 if (!len) {
243
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3085 if (!bytestream2_peek_byte(gb)) {
244 do {
245 411 bytestream2_skip(gb, 1);
246 411 len += 255;
247
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411 } while (!bytestream2_peek_byte(gb) && bytestream2_get_bytes_left(gb) > 0);
248 }
249 3085 len += bytestream2_get_byte(gb) + 7;
250 }
251 3595 i = bytestream2_get_le16(gb);
252 3595 pos = bytestream2_tell_p(pb) - 2048 * (opcode & 8);
253 3595 pos = pos - (i >> 2);
254
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3595 if (pos == bytestream2_tell_p(pb))
255 72 break;
256
257 3523 pos = pos - 0x4000;
258 3523 bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start);
259 3523 bytestream2_seek(&gbc, pos, SEEK_SET);
260
261
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3523 if (len < 6 || bytestream2_tell_p(pb) - bytestream2_tell(&gbc) < 4) {
262 216 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
263 216 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
264 do {
265 667 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
266 667 --len;
267
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667 } while (len);
268 } else {
269 3307 bytestream2_put_le32(pb, bytestream2_get_le32(&gbc));
270
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219261 for (len = len - 2; len; --len)
271 215954 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
272 }
273
274 3523 len = i & 3;
275
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3523 if (!len) {
276 3187 repeat = 1;
277 } else {
278 do {
279 551 bytestream2_put_byte(pb, bytestream2_get_byte(gb));
280 551 --len;
281
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551 } while (len);
282 336 opcode = bytestream2_peek_byte(gb);
283 }
284 }
285
286 72 return 0;
287 }
288
289 42 static int decode_type1(GetByteContext *gb, PutByteContext *pb)
290 {
291 42 unsigned opcode = 0, len;
292 42 int high = 0;
293 int i, pos;
294
295
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10429 while (bytestream2_get_bytes_left(gb) > 0) {
296 GetByteContext gbc;
297
298
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21442 while (bytestream2_get_bytes_left(gb) > 0) {
299
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21442 while (bytestream2_get_bytes_left(gb) > 0) {
300 21442 opcode = bytestream2_get_byte(gb);
301 21442 high = opcode >= 0x20;
302
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21442 if (high)
303 18221 break;
304
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3221 if (opcode)
305 3220 break;
306 1 opcode = bytestream2_get_byte(gb);
307
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1 if (opcode < 0xF8) {
308 1 opcode += 32;
309 1 break;
310 }
311 i = opcode - 0xF8;
312 if (i) {
313 len = 256;
314 do {
315 len *= 2;
316 --i;
317 } while (i);
318 } else {
319 len = 280;
320 }
321 do {
322 bytestream2_put_le32(pb, bytestream2_get_le32(gb));
323 bytestream2_put_le32(pb, bytestream2_get_le32(gb));
324 len -= 8;
325 } while (len && bytestream2_get_bytes_left(gb) > 0);
326 }
327
328
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21442 if (!high) {
329 do {
330 11005 bytestream2_put_byte(pb, bytestream2_get_byte(gb));
331 11005 --opcode;
332
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11005 } while (opcode && bytestream2_get_bytes_left(gb) > 0);
333
334
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3223 while (bytestream2_get_bytes_left(gb) > 0) {
335 GetByteContext gbc;
336
337 3223 opcode = bytestream2_get_byte(gb);
338
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3223 if (opcode >= 0x20)
339 3221 break;
340 2 bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start);
341
342 2 pos = -(opcode | 32 * bytestream2_get_byte(gb)) - 1;
343 2 bytestream2_seek(&gbc, bytestream2_tell_p(pb) + pos, SEEK_SET);
344 2 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
345 2 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
346 2 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
347 2 bytestream2_put_byte(pb, bytestream2_get_byte(gb));
348 }
349 }
350 21442 high = 0;
351
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21442 if (opcode < 0x40)
352 10429 break;
353 11013 bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start);
354 11013 pos = (-((opcode & 0x1F) | 32 * bytestream2_get_byte(gb)) - 1);
355 11013 bytestream2_seek(&gbc, bytestream2_tell_p(pb) + pos, SEEK_SET);
356 11013 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
357 11013 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
358 11013 len = (opcode >> 5) - 1;
359 do {
360 35434 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
361 35434 --len;
362
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35434 } while (len && bytestream2_get_bytes_left(&gbc) > 0);
363 }
364 10429 len = opcode & 0x1F;
365
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10429 if (!len) {
366
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3296 if (!bytestream2_peek_byte(gb)) {
367 do {
368 7405 bytestream2_skip(gb, 1);
369 7405 len += 255;
370
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7405 } while (!bytestream2_peek_byte(gb) && bytestream2_get_bytes_left(gb) > 0);
371 }
372 3296 len += bytestream2_get_byte(gb) + 31;
373 }
374 10429 pos = -bytestream2_get_byte(gb);
375 10429 bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start);
376 10429 bytestream2_seek(&gbc, bytestream2_tell_p(pb) + pos - (bytestream2_get_byte(gb) << 8), SEEK_SET);
377
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10429 if (bytestream2_tell_p(pb) == bytestream2_tell(&gbc))
378 42 break;
379
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10387 if (len < 5 || bytestream2_tell_p(pb) - bytestream2_tell(&gbc) < 4) {
380 1068 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
381 1068 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
382 1068 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
383 } else {
384 9319 bytestream2_put_le32(pb, bytestream2_get_le32(&gbc));
385 9319 len--;
386 }
387 do {
388 2411287 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
389 2411287 len--;
390
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2411287 } while (len && bytestream2_get_bytes_left(&gbc) > 0);
391 }
392
393 42 return 0;
394 }
395
396 34 static int decode_frame(AVCodecContext *avctx, void *data,
397 int *got_frame, AVPacket *avpkt)
398 {
399 34 FMVCContext *s = avctx->priv_data;
400 34 GetByteContext *gb = &s->gb;
401 34 PutByteContext *pb = &s->pb;
402 34 AVFrame *frame = data;
403 int ret, y, x;
404
405
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34 if (avpkt->size < 8)
406 return AVERROR_INVALIDDATA;
407
408
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34 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
409 return ret;
410
411 34 bytestream2_init(gb, avpkt->data, avpkt->size);
412 34 bytestream2_skip(gb, 2);
413
414 34 frame->key_frame = !!bytestream2_get_le16(gb);
415
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34 frame->pict_type = frame->key_frame ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
416
417
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34 if (frame->key_frame) {
418 const uint8_t *src;
419 unsigned type, size;
420 uint8_t *dst;
421
422 2 type = bytestream2_get_le16(gb);
423 2 size = bytestream2_get_le16(gb);
424
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2 if (size > bytestream2_get_bytes_left(gb))
425 return AVERROR_INVALIDDATA;
426
427 2 bytestream2_init_writer(pb, s->buffer, s->buffer_size);
428
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2 if (type == 1) {
429 1 decode_type1(gb, pb);
430
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1 } else if (type == 2){
431 1 decode_type2(gb, pb);
432 } else {
433 avpriv_report_missing_feature(avctx, "Compression type %d", type);
434 return AVERROR_PATCHWELCOME;
435 }
436
437 2 src = s->buffer;
438 2 dst = frame->data[0] + (avctx->height - 1) * frame->linesize[0];
439
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960 for (y = 0; y < avctx->height; y++) {
440 958 memcpy(dst, src, avctx->width * s->bpp);
441 958 dst -= frame->linesize[0];
442 958 src += s->stride * 4;
443
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958 if (bytestream2_tell_p(pb) < y*s->stride * 4)
444 break;
445 }
446 } else {
447 unsigned block, nb_blocks;
448 int type, k, l;
449 uint8_t *ssrc, *ddst;
450 const uint32_t *src;
451 uint32_t *dst;
452
453
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1067 for (block = 0; block < s->nb_blocks; block++)
454 1035 s->blocks[block].xor = 0;
455
456 32 nb_blocks = bytestream2_get_le16(gb);
457
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32 if (nb_blocks > s->nb_blocks)
458 return AVERROR_INVALIDDATA;
459
460 32 bytestream2_init_writer(pb, s->pbuffer, s->pbuffer_size);
461
462 32 type = bytestream2_get_le16(gb);
463
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144 for (block = 0; block < nb_blocks; block++) {
464 unsigned size, offset;
465 112 int start = 0;
466
467 112 offset = bytestream2_get_le16(gb);
468
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112 if (offset >= s->nb_blocks)
469 return AVERROR_INVALIDDATA;
470
471 112 size = bytestream2_get_le16(gb);
472
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112 if (size > bytestream2_get_bytes_left(gb))
473 return AVERROR_INVALIDDATA;
474
475 112 start = bytestream2_tell_p(pb);
476
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112 if (type == 1) {
477 41 decode_type1(gb, pb);
478
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71 } else if (type == 2){
479 71 decode_type2(gb, pb);
480 } else {
481 avpriv_report_missing_feature(avctx, "Compression type %d", type);
482 return AVERROR_PATCHWELCOME;
483 }
484
485
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112 if (s->blocks[offset].size * 4 != bytestream2_tell_p(pb) - start)
486 return AVERROR_INVALIDDATA;
487
488 112 s->blocks[offset].xor = 1;
489 }
490
491 32 src = (const uint32_t *)s->pbuffer;
492 32 dst = (uint32_t *)s->buffer;
493
494
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182 for (block = 0, y = 0; y < s->yb; y++) {
495 150 int block_h = s->blocks[block].h;
496 150 uint32_t *rect = dst;
497
498
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1185 for (x = 0; x < s->xb; x++) {
499 1035 int block_w = s->blocks[block].w;
500 1035 uint32_t *row = dst;
501
502 1035 block_h = s->blocks[block].h;
503
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1035 if (s->blocks[block].xor) {
504
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13668 for (k = 0; k < block_h; k++) {
505 13556 uint32_t *column = dst;
506
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1129796 for (l = 0; l < block_w; l++)
507 1116240 *dst++ ^= *src++;
508 13556 dst = &column[s->stride];
509 }
510 }
511 1035 dst = &row[block_w];
512 1035 ++block;
513 }
514 150 dst = &rect[block_h * s->stride];
515 }
516
517 32 ssrc = s->buffer;
518 32 ddst = frame->data[0] + (avctx->height - 1) * frame->linesize[0];
519
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17494 for (y = 0; y < avctx->height; y++) {
520 17462 memcpy(ddst, ssrc, avctx->width * s->bpp);
521 17462 ddst -= frame->linesize[0];
522 17462 ssrc += s->stride * 4;
523 }
524 }
525
526 34 *got_frame = 1;
527
528 34 return avpkt->size;
529 }
530
531 4 static av_cold int decode_init(AVCodecContext *avctx)
532 {
533 4 FMVCContext *s = avctx->priv_data;
534 4 int i, j, m, block = 0, h = BLOCK_HEIGHT, w = BLOCK_WIDTH;
535
536
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4 switch (avctx->bits_per_coded_sample) {
537 case 16:
538 avctx->pix_fmt = AV_PIX_FMT_RGB555LE;
539 break;
540 4 case 24:
541 4 avctx->pix_fmt = AV_PIX_FMT_BGR24;
542 4 break;
543 case 32:
544 avctx->pix_fmt = AV_PIX_FMT_BGRA;
545 break;
546 default:
547 av_log(avctx, AV_LOG_ERROR, "Unsupported bitdepth %i\n",
548 avctx->bits_per_coded_sample);
549 return AVERROR_INVALIDDATA;
550 }
551
552 4 s->stride = (avctx->width * avctx->bits_per_coded_sample + 31) / 32;
553 4 s->xb = s->stride / BLOCK_WIDTH;
554 4 m = s->stride % BLOCK_WIDTH;
555
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4 if (m) {
556
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4 if (m < 37) {
557 w = m + BLOCK_WIDTH;
558 } else {
559 4 w = m;
560 4 s->xb++;
561 }
562 }
563
564 4 s->yb = avctx->height / BLOCK_HEIGHT;
565 4 m = avctx->height % BLOCK_HEIGHT;
566
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4 if (m) {
567
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4 if (m < 49) {
568 4 h = m + BLOCK_HEIGHT;
569 } else {
570 h = m;
571 s->yb++;
572 }
573 }
574
575 4 s->nb_blocks = s->xb * s->yb;
576
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4 if (!s->nb_blocks)
577 return AVERROR_INVALIDDATA;
578 4 s->blocks = av_calloc(s->nb_blocks, sizeof(*s->blocks));
579
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4 if (!s->blocks)
580 return AVERROR(ENOMEM);
581
582
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20 for (i = 0; i < s->yb; i++) {
583
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122 for (j = 0; j < s->xb; j++) {
584
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106 if (i != (s->yb - 1) || j != (s->xb - 1)) {
585
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102 if (i == s->yb - 1) {
586 22 s->blocks[block].w = BLOCK_WIDTH;
587 22 s->blocks[block].h = h;
588 22 s->blocks[block].size = BLOCK_WIDTH * h;
589
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80 } else if (j == s->xb - 1) {
590 12 s->blocks[block].w = w;
591 12 s->blocks[block].h = BLOCK_HEIGHT;
592 12 s->blocks[block].size = BLOCK_HEIGHT * w;
593 } else {
594 68 s->blocks[block].w = BLOCK_WIDTH;
595 68 s->blocks[block].h = BLOCK_HEIGHT;
596 68 s->blocks[block].size = BLOCK_WIDTH * BLOCK_HEIGHT;
597 }
598 } else {
599 4 s->blocks[block].w = w;
600 4 s->blocks[block].h = h;
601 4 s->blocks[block].size = w * h;
602 }
603 106 block++;
604 }
605 }
606
607 4 s->bpp = avctx->bits_per_coded_sample >> 3;
608 4 s->buffer_size = avctx->width * avctx->height * 4;
609 4 s->pbuffer_size = avctx->width * avctx->height * 4;
610 4 s->buffer = av_mallocz(s->buffer_size);
611 4 s->pbuffer = av_mallocz(s->pbuffer_size);
612
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4 if (!s->buffer || !s->pbuffer)
613 return AVERROR(ENOMEM);
614
615 4 return 0;
616 }
617
618 4 static av_cold int decode_close(AVCodecContext *avctx)
619 {
620 4 FMVCContext *s = avctx->priv_data;
621
622 4 av_freep(&s->buffer);
623 4 av_freep(&s->pbuffer);
624 4 av_freep(&s->blocks);
625
626 4 return 0;
627 }
628
629 const AVCodec ff_fmvc_decoder = {
630 .name = "fmvc",
631 .long_name = NULL_IF_CONFIG_SMALL("FM Screen Capture Codec"),
632 .type = AVMEDIA_TYPE_VIDEO,
633 .id = AV_CODEC_ID_FMVC,
634 .priv_data_size = sizeof(FMVCContext),
635 .init = decode_init,
636 .close = decode_close,
637 .decode = decode_frame,
638 .capabilities = AV_CODEC_CAP_DR1,
639 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
640 FF_CODEC_CAP_INIT_CLEANUP,
641 };
642