FFmpeg
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fmvc.c
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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 <string.h>
25
26#include "libavutil/mem.h"
27#include "avcodec.h"
28#include "bytestream.h"
29#include "codec_internal.h"
30#include "decode.h"
31
32#define BLOCK_HEIGHT 112u
33#define BLOCK_WIDTH 84u
34
35typedef struct InterBlock {
36 int w, h;
37 int size;
38 int xor;
39} InterBlock;
40
41typedef struct FMVCContext {
42 GetByteContext gb;
43 PutByteContext pb;
44 uint8_t *buffer;
45 size_t buffer_size;
46 uint8_t *pbuffer;
47 size_t pbuffer_size;
48 ptrdiff_t stride;
49 int bpp;
50 int yb, xb;
51 InterBlock *blocks;
52 unsigned nb_blocks;
53} FMVCContext;
54
55static int decode_type2(GetByteContext *gb, PutByteContext *pb)
56{
57 unsigned repeat = 0, first = 1, opcode = 0;
58 int i, len, pos;
59
60 while (bytestream2_get_bytes_left(gb) > 0) {
61 GetByteContext gbc;
62
63 while (bytestream2_get_bytes_left(gb) > 0) {
64 if (first) {
65 first = 0;
66 if (bytestream2_peek_byte(gb) > 17) {
67 len = bytestream2_get_byte(gb) - 17;
68 if (len < 4) {
69 do {
70 bytestream2_put_byte(pb, bytestream2_get_byte(gb));
71 --len;
72 } while (len);
73 opcode = bytestream2_peek_byte(gb);
74 continue;
75 } else {
76 do {
77 bytestream2_put_byte(pb, bytestream2_get_byte(gb));
78 --len;
79 } while (len);
80 opcode = bytestream2_peek_byte(gb);
81 if (opcode < 0x10) {
82 bytestream2_skip(gb, 1);
83 pos = - (opcode >> 2) - 4 * bytestream2_get_byte(gb) - 2049;
84
85 bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start);
86 bytestream2_seek(&gbc, bytestream2_tell_p(pb) + pos, SEEK_SET);
87
88 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
89 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
90 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
91 len = opcode & 3;
92 if (!len) {
93 repeat = 1;
94 } else {
95 do {
96 bytestream2_put_byte(pb, bytestream2_get_byte(gb));
97 --len;
98 } while (len);
99 opcode = bytestream2_peek_byte(gb);
100 }
101 continue;
102 }
103 }
104 }
105 repeat = 1;
106 }
107 if (repeat) {
108 repeat = 0;
109 opcode = bytestream2_peek_byte(gb);
110 if (opcode < 0x10) {
111 bytestream2_skip(gb, 1);
112 if (!opcode) {
113 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 opcode += bytestream2_get_byte(gb) + 15;
120 }
121 bytestream2_put_le32(pb, bytestream2_get_le32(gb));
122 for (i = opcode - 1; i > 0; --i)
123 bytestream2_put_byte(pb, bytestream2_get_byte(gb));
124 opcode = bytestream2_peek_byte(gb);
125 if (opcode < 0x10) {
126 bytestream2_skip(gb, 1);
127 pos = - (opcode >> 2) - 4 * bytestream2_get_byte(gb) - 2049;
128
129 bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start);
130 bytestream2_seek(&gbc, bytestream2_tell_p(pb) + pos, SEEK_SET);
131
132 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
133 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
134 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
135 len = opcode & 3;
136 if (!len) {
137 repeat = 1;
138 } else {
139 do {
140 bytestream2_put_byte(pb, bytestream2_get_byte(gb));
141 --len;
142 } while (len);
143 opcode = bytestream2_peek_byte(gb);
144 }
145 continue;
146 }
147 }
148 }
149
150 if (opcode >= 0x40) {
151 bytestream2_skip(gb, 1);
152 pos = - ((opcode >> 2) & 7) - 1 - 8 * bytestream2_get_byte(gb);
153 len = (opcode >> 5) - 1;
154
155 bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start);
156 bytestream2_seek(&gbc, bytestream2_tell_p(pb) + pos, SEEK_SET);
157
158 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
159 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
160 do {
161 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
162 --len;
163 } while (len);
164
165 len = opcode & 3;
166
167 if (!len) {
168 repeat = 1;
169 } else {
170 do {
171 bytestream2_put_byte(pb, bytestream2_get_byte(gb));
172 --len;
173 } while (len);
174 opcode = bytestream2_peek_byte(gb);
175 }
176 continue;
177 } else if (opcode < 0x20) {
178 break;
179 }
180 len = opcode & 0x1F;
181 bytestream2_skip(gb, 1);
182 if (!len) {
183 if (!bytestream2_peek_byte(gb)) {
184 do {
185 bytestream2_skip(gb, 1);
186 len += 255;
187 } while (!bytestream2_peek_byte(gb) && bytestream2_get_bytes_left(gb) > 0);
188 }
189 len += bytestream2_get_byte(gb) + 31;
190 }
191 i = bytestream2_get_le16(gb);
192 pos = - (i >> 2) - 1;
193
194 bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start);
195 bytestream2_seek(&gbc, bytestream2_tell_p(pb) + pos, SEEK_SET);
196
197 if (len < 6 || bytestream2_tell_p(pb) - bytestream2_tell(&gbc) < 4) {
198 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
199 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
200 do {
201 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
202 --len;
203 } while (len);
204 } else {
205 bytestream2_put_le32(pb, bytestream2_get_le32(&gbc));
206 for (len = len - 2; len; --len)
207 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
208 }
209 len = i & 3;
210 if (!len) {
211 repeat = 1;
212 } else {
213 do {
214 bytestream2_put_byte(pb, bytestream2_get_byte(gb));
215 --len;
216 } while (len);
217 opcode = bytestream2_peek_byte(gb);
218 }
219 }
220 bytestream2_skip(gb, 1);
221 if (opcode < 0x10) {
222 pos = -(opcode >> 2) - 1 - 4 * bytestream2_get_byte(gb);
223
224 bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start);
225 bytestream2_seek(&gbc, bytestream2_tell_p(pb) + pos, SEEK_SET);
226
227 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
228 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
229 len = opcode & 3;
230 if (!len) {
231 repeat = 1;
232 } else {
233 do {
234 bytestream2_put_byte(pb, bytestream2_get_byte(gb));
235 --len;
236 } while (len);
237 opcode = bytestream2_peek_byte(gb);
238 }
239 continue;
240 }
241 len = opcode & 7;
242 if (!len) {
243 if (!bytestream2_peek_byte(gb)) {
244 do {
245 bytestream2_skip(gb, 1);
246 len += 255;
247 } while (!bytestream2_peek_byte(gb) && bytestream2_get_bytes_left(gb) > 0);
248 }
249 len += bytestream2_get_byte(gb) + 7;
250 }
251 i = bytestream2_get_le16(gb);
252 pos = bytestream2_tell_p(pb) - 2048 * (opcode & 8);
253 pos = pos - (i >> 2);
254 if (pos == bytestream2_tell_p(pb))
255 break;
256
257 pos = pos - 0x4000;
258 bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start);
259 bytestream2_seek(&gbc, pos, SEEK_SET);
260
261 if (len < 6 || bytestream2_tell_p(pb) - bytestream2_tell(&gbc) < 4) {
262 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
263 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
264 do {
265 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
266 --len;
267 } while (len);
268 } else {
269 bytestream2_put_le32(pb, bytestream2_get_le32(&gbc));
270 for (len = len - 2; len; --len)
271 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
272 }
273
274 len = i & 3;
275 if (!len) {
276 repeat = 1;
277 } else {
278 do {
279 bytestream2_put_byte(pb, bytestream2_get_byte(gb));
280 --len;
281 } while (len);
282 opcode = bytestream2_peek_byte(gb);
283 }
284 }
285
286 return 0;
287}
288
289static int decode_type1(GetByteContext *gb, PutByteContext *pb)
290{
291 unsigned opcode = 0, len;
292 int high = 0;
293 int i, pos;
294
295 while (bytestream2_get_bytes_left(gb) > 0) {
296 GetByteContext gbc;
297
298 while (bytestream2_get_bytes_left(gb) > 0) {
299 while (bytestream2_get_bytes_left(gb) > 0) {
300 opcode = bytestream2_get_byte(gb);
301 high = opcode >= 0x20;
302 if (high)
303 break;
304 if (opcode)
305 break;
306 opcode = bytestream2_get_byte(gb);
307 if (opcode < 0xF8) {
308 opcode += 32;
309 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 if (!high) {
329 do {
330 bytestream2_put_byte(pb, bytestream2_get_byte(gb));
331 --opcode;
332 } while (opcode && bytestream2_get_bytes_left(gb) > 0);
333
334 while (bytestream2_get_bytes_left(gb) > 0) {
335 GetByteContext gbc;
336
337 opcode = bytestream2_get_byte(gb);
338 if (opcode >= 0x20)
339 break;
340 bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start);
341
342 pos = -(opcode | 32 * bytestream2_get_byte(gb)) - 1;
343 bytestream2_seek(&gbc, bytestream2_tell_p(pb) + pos, SEEK_SET);
344 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
345 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
346 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
347 bytestream2_put_byte(pb, bytestream2_get_byte(gb));
348 }
349 }
350 high = 0;
351 if (opcode < 0x40)
352 break;
353 bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start);
354 pos = (-((opcode & 0x1F) | 32 * bytestream2_get_byte(gb)) - 1);
355 bytestream2_seek(&gbc, bytestream2_tell_p(pb) + pos, SEEK_SET);
356 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
357 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
358 len = (opcode >> 5) - 1;
359 do {
360 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
361 --len;
362 } while (len && bytestream2_get_bytes_left(&gbc) > 0);
363 }
364 len = opcode & 0x1F;
365 if (!len) {
366 if (!bytestream2_peek_byte(gb)) {
367 do {
368 bytestream2_skip(gb, 1);
369 len += 255;
370 } while (!bytestream2_peek_byte(gb) && bytestream2_get_bytes_left(gb) > 0);
371 }
372 len += bytestream2_get_byte(gb) + 31;
373 }
374 pos = -bytestream2_get_byte(gb);
375 bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start);
376 bytestream2_seek(&gbc, bytestream2_tell_p(pb) + pos - (bytestream2_get_byte(gb) << 8), SEEK_SET);
377 if (bytestream2_tell_p(pb) == bytestream2_tell(&gbc))
378 break;
379 if (len < 5 || bytestream2_tell_p(pb) - bytestream2_tell(&gbc) < 4) {
380 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
381 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
382 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
383 } else {
384 bytestream2_put_le32(pb, bytestream2_get_le32(&gbc));
385 len--;
386 }
387 do {
388 bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
389 len--;
390 } while (len && bytestream2_get_bytes_left(&gbc) > 0);
391 }
392
393 return 0;
394}
395
396static int decode_frame(AVCodecContext *avctx, AVFrame *frame,
397 int *got_frame, AVPacket *avpkt)
398{
399 FMVCContext *s = avctx->priv_data;
400 GetByteContext *gb = &s->gb;
401 PutByteContext *pb = &s->pb;
402 int ret, y, x;
403 int key_frame;
404
405 if (avpkt->size < 8)
406 return AVERROR_INVALIDDATA;
407
408 bytestream2_init(gb, avpkt->data, avpkt->size);
409 bytestream2_skip(gb, 2);
410
411 key_frame = !!bytestream2_get_le16(gb);
412
413 if (key_frame) {
414 const uint8_t *src;
415 unsigned type, size;
416 uint8_t *dst;
417
418 type = bytestream2_get_le16(gb);
419 size = bytestream2_get_le16(gb);
420 if (size > bytestream2_get_bytes_left(gb))
421 return AVERROR_INVALIDDATA;
422
423 bytestream2_init_writer(pb, s->buffer, s->buffer_size);
424 if (type == 1) {
425 decode_type1(gb, pb);
426 } else if (type == 2){
427 decode_type2(gb, pb);
428 } else {
429 avpriv_report_missing_feature(avctx, "Compression type %d", type);
430 return AVERROR_PATCHWELCOME;
431 }
432
433 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
434 return ret;
435
436 frame->flags |= AV_FRAME_FLAG_KEY;
437 frame->pict_type = AV_PICTURE_TYPE_I;
438
439 src = s->buffer;
440 dst = frame->data[0] + (avctx->height - 1) * frame->linesize[0];
441 for (y = 0; y < avctx->height; y++) {
442 memcpy(dst, src, avctx->width * s->bpp);
443 dst -= frame->linesize[0];
444 src += s->stride * 4;
445 if (bytestream2_tell_p(pb) < y*s->stride * 4)
446 break;
447 }
448 } else {
449 unsigned block, nb_blocks;
450 int type, k, l;
451 uint8_t *ssrc, *ddst;
452 const uint32_t *src;
453 uint32_t *dst;
454
455 for (block = 0; block < s->nb_blocks; block++)
456 s->blocks[block].xor = 0;
457
458 nb_blocks = bytestream2_get_le16(gb);
459 if (nb_blocks > s->nb_blocks)
460 return AVERROR_INVALIDDATA;
461
462 bytestream2_init_writer(pb, s->pbuffer, s->pbuffer_size);
463
464 type = bytestream2_get_le16(gb);
465 for (block = 0; block < nb_blocks; block++) {
466 unsigned size, offset;
467 int start = 0;
468
469 offset = bytestream2_get_le16(gb);
470 if (offset >= s->nb_blocks)
471 return AVERROR_INVALIDDATA;
472
473 size = bytestream2_get_le16(gb);
474 if (size > bytestream2_get_bytes_left(gb))
475 return AVERROR_INVALIDDATA;
476
477 start = bytestream2_tell_p(pb);
478 if (type == 1) {
479 decode_type1(gb, pb);
480 } else if (type == 2){
481 decode_type2(gb, pb);
482 } else {
483 avpriv_report_missing_feature(avctx, "Compression type %d", type);
484 return AVERROR_PATCHWELCOME;
485 }
486
487 if (s->blocks[offset].size * 4 != bytestream2_tell_p(pb) - start)
488 return AVERROR_INVALIDDATA;
489
490 s->blocks[offset].xor = 1;
491 }
492
493 src = (const uint32_t *)s->pbuffer;
494 dst = (uint32_t *)s->buffer;
495
496 for (block = 0, y = 0; y < s->yb; y++) {
497 int block_h = s->blocks[block].h;
498 uint32_t *rect = dst;
499
500 for (x = 0; x < s->xb; x++) {
501 int block_w = s->blocks[block].w;
502 uint32_t *row = dst;
503
504 block_h = s->blocks[block].h;
505 if (s->blocks[block].xor) {
506 for (k = 0; k < block_h; k++) {
507 uint32_t *column = dst;
508 for (l = 0; l < block_w; l++)
509 *dst++ ^= *src++;
510 dst = &column[s->stride];
511 }
512 }
513 dst = &row[block_w];
514 ++block;
515 }
516 dst = &rect[block_h * s->stride];
517 }
518
519 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
520 return ret;
521
522 frame->flags &= ~AV_FRAME_FLAG_KEY;
523 frame->pict_type = AV_PICTURE_TYPE_P;
524
525 ssrc = s->buffer;
526 ddst = frame->data[0] + (avctx->height - 1) * frame->linesize[0];
527 for (y = 0; y < avctx->height; y++) {
528 memcpy(ddst, ssrc, avctx->width * s->bpp);
529 ddst -= frame->linesize[0];
530 ssrc += s->stride * 4;
531 }
532 }
533
534 *got_frame = 1;
535
536 return avpkt->size;
537}
538
539static av_cold int decode_init(AVCodecContext *avctx)
540{
541 FMVCContext *s = avctx->priv_data;
542 int i, j, m, block = 0, h = BLOCK_HEIGHT, w = BLOCK_WIDTH;
543
544 switch (avctx->bits_per_coded_sample) {
545 case 16:
546 avctx->pix_fmt = AV_PIX_FMT_RGB555LE;
547 break;
548 case 24:
549 avctx->pix_fmt = AV_PIX_FMT_BGR24;
550 break;
551 case 32:
552 avctx->pix_fmt = AV_PIX_FMT_BGRA;
553 break;
554 default:
555 av_log(avctx, AV_LOG_ERROR, "Unsupported bitdepth %i\n",
556 avctx->bits_per_coded_sample);
557 return AVERROR_INVALIDDATA;
558 }
559
560 s->stride = (avctx->width * avctx->bits_per_coded_sample + 31) / 32;
561 s->xb = s->stride / BLOCK_WIDTH;
562 m = s->stride % BLOCK_WIDTH;
563 if (m) {
564 if (m < 37) {
565 w = m + BLOCK_WIDTH;
566 } else {
567 w = m;
568 s->xb++;
569 }
570 }
571
572 s->yb = avctx->height / BLOCK_HEIGHT;
573 m = avctx->height % BLOCK_HEIGHT;
574 if (m) {
575 if (m < 49) {
576 h = m + BLOCK_HEIGHT;
577 } else {
578 h = m;
579 s->yb++;
580 }
581 }
582
583 s->nb_blocks = s->xb * s->yb;
584 if (!s->nb_blocks)
585 return AVERROR_INVALIDDATA;
586 s->blocks = av_calloc(s->nb_blocks, sizeof(*s->blocks));
587 if (!s->blocks)
588 return AVERROR(ENOMEM);
589
590 for (i = 0; i < s->yb; i++) {
591 for (j = 0; j < s->xb; j++) {
592 if (i != (s->yb - 1) || j != (s->xb - 1)) {
593 if (i == s->yb - 1) {
594 s->blocks[block].w = BLOCK_WIDTH;
595 s->blocks[block].h = h;
596 s->blocks[block].size = BLOCK_WIDTH * h;
597 } else if (j == s->xb - 1) {
598 s->blocks[block].w = w;
599 s->blocks[block].h = BLOCK_HEIGHT;
600 s->blocks[block].size = BLOCK_HEIGHT * w;
601 } else {
602 s->blocks[block].w = BLOCK_WIDTH;
603 s->blocks[block].h = BLOCK_HEIGHT;
604 s->blocks[block].size = BLOCK_WIDTH * BLOCK_HEIGHT;
605 }
606 } else {
607 s->blocks[block].w = w;
608 s->blocks[block].h = h;
609 s->blocks[block].size = w * h;
610 }
611 block++;
612 }
613 }
614
615 s->bpp = avctx->bits_per_coded_sample >> 3;
616 s->buffer_size = avctx->width * avctx->height * 4;
617 s->pbuffer_size = avctx->width * avctx->height * 4;
618 s->buffer = av_mallocz(s->buffer_size);
619 s->pbuffer = av_mallocz(s->pbuffer_size);
620 if (!s->buffer || !s->pbuffer)
621 return AVERROR(ENOMEM);
622
623 return 0;
624}
625
626static av_cold int decode_close(AVCodecContext *avctx)
627{
628 FMVCContext *s = avctx->priv_data;
629
630 av_freep(&s->buffer);
631 av_freep(&s->pbuffer);
632 av_freep(&s->blocks);
633
634 return 0;
635}
636
637const FFCodec ff_fmvc_decoder = {
638 .p.name = "fmvc",
639 CODEC_LONG_NAME("FM Screen Capture Codec"),
640 .p.type = AVMEDIA_TYPE_VIDEO,
641 .p.id = AV_CODEC_ID_FMVC,
642 .priv_data_size = sizeof(FMVCContext),
643 .init = decode_init,
644 .close = decode_close,
645 FF_CODEC_DECODE_CB(decode_frame),
646 .p.capabilities = AV_CODEC_CAP_DR1,
647 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
648};
dst
uint8_t ptrdiff_t const uint8_t ptrdiff_t int intptr_t intptr_t int int16_t * dst
Definition dsp.h:87
ff_fmvc_decoder
const FFCodec ff_fmvc_decoder
Definition fmvc.c:637
close
static av_cold void close(AVCodecParserContext *s)
Definition apv_parser.c:197
avcodec.h
Libavcodec external API header.
bytestream2_tell_p
static av_always_inline int bytestream2_tell_p(const PutByteContext *p)
Definition bytestream.h:197
bytestream2_init_writer
static av_always_inline void bytestream2_init_writer(PutByteContext *p, uint8_t *buf, int buf_size)
Definition bytestream.h:147
bytestream2_get_bytes_left
static av_always_inline int bytestream2_get_bytes_left(const GetByteContext *g)
Definition bytestream.h:158
bytestream2_init
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition bytestream.h:137
bytestream2_skip
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
Definition bytestream.h:168
bytestream2_seek
static av_always_inline int bytestream2_seek(GetByteContext *g, int offset, int whence)
Definition bytestream.h:212
bytestream2_tell
static av_always_inline int bytestream2_tell(const GetByteContext *g)
Definition bytestream.h:192
i
#define i(width, name, range_min, range_max)
Definition cbs_h264.c:63
s
#define s(width, name)
Definition cbs_vp9.c:198
codec_internal.h
FF_CODEC_DECODE_CB
#define FF_CODEC_DECODE_CB(func)
Definition codec_internal.h:374
CODEC_LONG_NAME
#define CODEC_LONG_NAME(str)
Definition codec_internal.h:359
FF_CODEC_CAP_INIT_CLEANUP
#define FF_CODEC_CAP_INIT_CLEANUP
The codec allows calling the close function for deallocation even if the init function returned a fai...
Definition codec_internal.h:43
block
static int16_t block[64]
Definition dct.c:125
ff_get_buffer
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition decode.c:1777
frame
static AVFrame * frame
Definition demux_decode.c:54
high
int high
Definition dovi_rpuenc.c:39
init
int(* init)(AVBSFContext *ctx)
Definition dts2pts.c:608
BLOCK_HEIGHT
#define BLOCK_HEIGHT
Definition flashsvenc.c:60
BLOCK_WIDTH
#define BLOCK_WIDTH
Definition flashsvenc.c:59
decode_frame
static int decode_frame(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *avpkt)
Definition fmvc.c:396
decode_close
static av_cold int decode_close(AVCodecContext *avctx)
Definition fmvc.c:626
decode_type2
static int decode_type2(GetByteContext *gb, PutByteContext *pb)
Definition fmvc.c:55
decode_init
static av_cold int decode_init(AVCodecContext *avctx)
Definition fmvc.c:539
decode_type1
static int decode_type1(GetByteContext *gb, PutByteContext *pb)
Definition fmvc.c:289
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition codec.h:49
AV_CODEC_ID_FMVC
@ AV_CODEC_ID_FMVC
Definition codec_id.h:271
AVERROR_PATCHWELCOME
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition error.h:64
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition error.h:61
AVERROR
#define AVERROR(e)
Definition error.h:45
AV_FRAME_FLAG_KEY
#define AV_FRAME_FLAG_KEY
A flag to mark frames that are keyframes.
Definition frame.h:687
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition log.h:210
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition avutil.h:200
AV_PICTURE_TYPE_I
@ AV_PICTURE_TYPE_I
Intra.
Definition avutil.h:278
AV_PICTURE_TYPE_P
@ AV_PICTURE_TYPE_P
Predicted.
Definition avutil.h:279
type
cl_device_type type
Definition hwcontext_opencl.c:213
offset
unsigned offset
Definition libaomenc.c:763
decode_init
static av_cold int decode_init(AVCodecContext *avctx)
Definition 4xm.c:998
decode_frame
static int decode_frame(AVCodecContext *avctx, AVFrame *picture, int *got_frame, AVPacket *avpkt)
Definition 4xm.c:837
decode_close
static av_cold int decode_close(AVCodecContext *avctx)
Definition aacdec.c:1220
av_cold
#define av_cold
Definition attributes.h:117
avpriv_report_missing_feature
void avpriv_report_missing_feature(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
w
uint8_t w
Definition llvidencdsp.c:39
av_calloc
void * av_calloc(size_t nmemb, size_t size)
Definition mem.c:264
mem.h
Memory handling functions.
AV_PIX_FMT_BGRA
@ AV_PIX_FMT_BGRA
packed BGRA 8:8:8:8, 32bpp, BGRABGRA...
Definition pixfmt.h:102
AV_PIX_FMT_RGB555LE
@ AV_PIX_FMT_RGB555LE
packed RGB 5:5:5, 16bpp, (msb)1X 5R 5G 5B(lsb), little-endian, X=unused/undefined
Definition pixfmt.h:115
AV_PIX_FMT_BGR24
@ AV_PIX_FMT_BGR24
packed RGB 8:8:8, 24bpp, BGRBGR...
Definition pixfmt.h:76
pos
unsigned int pos
Definition spdifenc.c:431
AVCodecContext
main external API structure.
Definition avcodec.h:443
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition avcodec.h:643
AVCodecContext::width
int width
picture width / height.
Definition avcodec.h:604
AVCodecContext::bits_per_coded_sample
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition avcodec.h:1564
AVCodecContext::priv_data
void * priv_data
Definition avcodec.h:470
AVFrame
This structure describes decoded (raw) audio or video data.
Definition frame.h:472
AVPacket
This structure stores compressed data.
Definition packet.h:580
AVPacket::size
int size
Definition packet.h:604
AVPacket::data
uint8_t * data
Definition packet.h:603
FMVCContext::pbuffer
uint8_t * pbuffer
Definition fmvc.c:46
FMVCContext::pb
PutByteContext pb
Definition fmvc.c:43
FMVCContext::buffer
uint8_t * buffer
Definition fmvc.c:44
FMVCContext::buffer_size
size_t buffer_size
Definition fmvc.c:45
FMVCContext::bpp
int bpp
Definition fmvc.c:49
FMVCContext::yb
int yb
Definition fmvc.c:50
FMVCContext::gb
GetByteContext gb
Definition fmvc.c:42
FMVCContext::blocks
InterBlock * blocks
Definition fmvc.c:51
FMVCContext::nb_blocks
unsigned nb_blocks
Definition fmvc.c:52
FMVCContext::pbuffer_size
size_t pbuffer_size
Definition fmvc.c:47
FMVCContext::xb
int xb
Definition fmvc.c:50
FMVCContext::stride
ptrdiff_t stride
Definition fmvc.c:48
InterBlock::size
int size
Definition fmvc.c:37
InterBlock::h
int h
Definition fmvc.c:36
InterBlock::w
int w
Definition fmvc.c:36
InterBlock::xor
int xor
Definition fmvc.c:38
PutByteContext::buffer_end
uint8_t * buffer_end
Definition bytestream.h:38
PutByteContext::buffer_start
uint8_t * buffer_start
Definition bytestream.h:38
av_mallocz
#define av_mallocz(s)
Definition tableprint_vlc.h:31
av_freep
#define av_freep(p)
Definition tableprint_vlc.h:35
av_log
#define av_log(a,...)
Definition tableprint_vlc.h:27
src
#define src
Definition vp8dsp.c:248
size
int size
Definition twinvq_data.h:10344
len
int len
Definition vorbis_enc_data.h:426
h
h
Definition vp9dsp_template.c:2070
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