1 |
|
|
/* |
2 |
|
|
* libquicktime yuv4 decoder |
3 |
|
|
* |
4 |
|
|
* Copyright (c) 2011 Carl Eugen Hoyos |
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 "avcodec.h" |
24 |
|
|
#include "internal.h" |
25 |
|
|
|
26 |
|
8 |
static av_cold int yuv4_decode_init(AVCodecContext *avctx) |
27 |
|
|
{ |
28 |
|
8 |
avctx->pix_fmt = AV_PIX_FMT_YUV420P; |
29 |
|
|
|
30 |
|
8 |
return 0; |
31 |
|
|
} |
32 |
|
|
|
33 |
|
200 |
static int yuv4_decode_frame(AVCodecContext *avctx, void *data, |
34 |
|
|
int *got_frame, AVPacket *avpkt) |
35 |
|
|
{ |
36 |
|
200 |
AVFrame *pic = data; |
37 |
|
200 |
const uint8_t *src = avpkt->data; |
38 |
|
|
uint8_t *y, *u, *v; |
39 |
|
|
int i, j, ret; |
40 |
|
|
|
41 |
✗✓ |
200 |
if (avpkt->size < 6 * (avctx->width + 1 >> 1) * (avctx->height + 1 >> 1)) { |
42 |
|
|
av_log(avctx, AV_LOG_ERROR, "Insufficient input data.\n"); |
43 |
|
|
return AVERROR(EINVAL); |
44 |
|
|
} |
45 |
|
|
|
46 |
✗✓ |
200 |
if ((ret = ff_get_buffer(avctx, pic, 0)) < 0) |
47 |
|
|
return ret; |
48 |
|
|
|
49 |
|
200 |
pic->key_frame = 1; |
50 |
|
200 |
pic->pict_type = AV_PICTURE_TYPE_I; |
51 |
|
|
|
52 |
|
200 |
y = pic->data[0]; |
53 |
|
200 |
u = pic->data[1]; |
54 |
|
200 |
v = pic->data[2]; |
55 |
|
|
|
56 |
✓✓ |
22650 |
for (i = 0; i < (avctx->height + 1) >> 1; i++) { |
57 |
✓✓ |
3838500 |
for (j = 0; j < (avctx->width + 1) >> 1; j++) { |
58 |
|
3816050 |
u[j] = *src++ ^ 0x80; |
59 |
|
3816050 |
v[j] = *src++ ^ 0x80; |
60 |
|
3816050 |
y[ 2 * j ] = *src++; |
61 |
|
3816050 |
y[ 2 * j + 1] = *src++; |
62 |
|
3816050 |
y[pic->linesize[0] + 2 * j ] = *src++; |
63 |
|
3816050 |
y[pic->linesize[0] + 2 * j + 1] = *src++; |
64 |
|
|
} |
65 |
|
|
|
66 |
|
22450 |
y += 2 * pic->linesize[0]; |
67 |
|
22450 |
u += pic->linesize[1]; |
68 |
|
22450 |
v += pic->linesize[2]; |
69 |
|
|
} |
70 |
|
|
|
71 |
|
200 |
*got_frame = 1; |
72 |
|
|
|
73 |
|
200 |
return avpkt->size; |
74 |
|
|
} |
75 |
|
|
|
76 |
|
|
AVCodec ff_yuv4_decoder = { |
77 |
|
|
.name = "yuv4", |
78 |
|
|
.long_name = NULL_IF_CONFIG_SMALL("Uncompressed packed 4:2:0"), |
79 |
|
|
.type = AVMEDIA_TYPE_VIDEO, |
80 |
|
|
.id = AV_CODEC_ID_YUV4, |
81 |
|
|
.init = yuv4_decode_init, |
82 |
|
|
.decode = yuv4_decode_frame, |
83 |
|
|
.capabilities = AV_CODEC_CAP_DR1, |
84 |
|
|
}; |