1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
|
/*
* Forward Uncompressed
*
* Copyright (c) 2009 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avcodec.h"
#include "bytestream.h"
#include "internal.h"
static av_cold int decode_init(AVCodecContext *avctx)
{
if (avctx->width & 1) {
av_log(avctx, AV_LOG_ERROR, "frwu needs even width\n");
return AVERROR(EINVAL);
}
avctx->pix_fmt = AV_PIX_FMT_UYVY422;
return 0;
}
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
AVPacket *avpkt)
{
int field, ret;
AVFrame *pic = data;
const uint8_t *buf = avpkt->data;
const uint8_t *buf_end = buf + avpkt->size;
if (avpkt->size < avctx->width * 2 * avctx->height + 4 + 2*8) {
av_log(avctx, AV_LOG_ERROR, "Packet is too small.\n");
return AVERROR_INVALIDDATA;
}
if (bytestream_get_le32(&buf) != MKTAG('F', 'R', 'W', '1')) {
av_log(avctx, AV_LOG_ERROR, "incorrect marker\n");
return AVERROR_INVALIDDATA;
}
if ((ret = ff_get_buffer(avctx, pic, 0)) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return ret;
}
pic->pict_type = AV_PICTURE_TYPE_I;
pic->key_frame = 1;
pic->interlaced_frame = 1;
pic->top_field_first = 1;
for (field = 0; field < 2; field++) {
int i;
int field_h = (avctx->height + !field) >> 1;
int field_size, min_field_size = avctx->width * 2 * field_h;
uint8_t *dst = pic->data[0];
if (buf_end - buf < 8)
return AVERROR_INVALIDDATA;
buf += 4; // flags? 0x80 == bottom field maybe?
field_size = bytestream_get_le32(&buf);
if (field_size < min_field_size) {
av_log(avctx, AV_LOG_ERROR, "Field size %i is too small (required %i)\n", field_size, min_field_size);
return AVERROR_INVALIDDATA;
}
if (buf_end - buf < field_size) {
av_log(avctx, AV_LOG_ERROR, "Packet is too small, need %i, have %i\n", field_size, (int)(buf_end - buf));
return AVERROR_INVALIDDATA;
}
if (field)
dst += pic->linesize[0];
for (i = 0; i < field_h; i++) {
memcpy(dst, buf, avctx->width * 2);
buf += avctx->width * 2;
dst += pic->linesize[0] << 1;
}
buf += field_size - min_field_size;
}
*got_frame = 1;
return avpkt->size;
}
AVCodec ff_frwu_decoder = {
.name = "frwu",
.long_name = NULL_IF_CONFIG_SMALL("Forward Uncompressed"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_FRWU,
.init = decode_init,
.decode = decode_frame,
.capabilities = CODEC_CAP_DR1,
};
|
