Main Page
Related Pages
Modules
Data Structures
Files
Examples
File List
Globals
libavcodec
dxtory.c
Go to the documentation of this file.
1
/*
2
* Dxtory decoder
3
*
4
* Copyright (c) 2011 Konstantin Shishkov
5
*
6
* This file is part of Libav.
7
*
8
* Libav 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
* Libav 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 Libav; 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
#include "
libavutil/intreadwrite.h
"
26
27
static
av_cold
int
decode_init
(
AVCodecContext
*avctx)
28
{
29
avctx->
pix_fmt
=
PIX_FMT_YUV420P
;
30
avctx->
coded_frame
=
avcodec_alloc_frame
();
31
if
(!avctx->
coded_frame
)
32
return
AVERROR
(ENOMEM);
33
34
return
0;
35
}
36
37
static
int
decode_frame
(
AVCodecContext
*avctx,
void
*
data
,
int
*data_size,
38
AVPacket
*avpkt)
39
{
40
int
h, w;
41
AVFrame
*pic = avctx->
coded_frame
;
42
const
uint8_t *src = avpkt->
data
;
43
uint8_t *Y1, *Y2, *
U
, *
V
;
44
int
ret;
45
46
if
(pic->
data
[0])
47
avctx->
release_buffer
(avctx, pic);
48
49
if
(avpkt->
size
< avctx->
width
* avctx->
height
* 3 / 2 + 16) {
50
av_log
(avctx,
AV_LOG_ERROR
,
"packet too small\n"
);
51
return
AVERROR_INVALIDDATA
;
52
}
53
54
pic->
reference
= 0;
55
if
((ret =
ff_get_buffer
(avctx, pic)) < 0)
56
return
ret;
57
58
pic->
pict_type
=
AV_PICTURE_TYPE_I
;
59
pic->
key_frame
= 1;
60
61
if
(
AV_RL32
(src) != 0x01000002) {
62
av_log_ask_for_sample
(avctx,
"Unknown frame header %X\n"
,
AV_RL32
(src));
63
return
AVERROR_PATCHWELCOME
;
64
}
65
src += 16;
66
67
Y1 = pic->
data
[0];
68
Y2 = pic->
data
[0] + pic->
linesize
[0];
69
U = pic->
data
[1];
70
V = pic->
data
[2];
71
for
(h = 0; h < avctx->
height
; h += 2) {
72
for
(w = 0; w < avctx->
width
; w += 2) {
73
AV_WN16A
(Y1 + w,
AV_RN16A
(src));
74
AV_WN16A
(Y2 + w,
AV_RN16A
(src + 2));
75
U[w >> 1] = src[4] + 0x80;
76
V[w >> 1] = src[5] + 0x80;
77
src += 6;
78
}
79
Y1 += pic->
linesize
[0] << 1;
80
Y2 += pic->
linesize
[0] << 1;
81
U += pic->
linesize
[1];
82
V += pic->
linesize
[2];
83
}
84
85
*data_size =
sizeof
(
AVFrame
);
86
*(
AVFrame
*)data = *pic;
87
88
return
avpkt->
size
;
89
}
90
91
static
av_cold
int
decode_close
(
AVCodecContext
*avctx)
92
{
93
AVFrame
*pic = avctx->
coded_frame
;
94
if
(pic->
data
[0])
95
avctx->
release_buffer
(avctx, pic);
96
av_freep
(&avctx->
coded_frame
);
97
98
return
0;
99
}
100
101
AVCodec
ff_dxtory_decoder
= {
102
.
name
=
"dxtory"
,
103
.long_name =
NULL_IF_CONFIG_SMALL
(
"Dxtory"
),
104
.type =
AVMEDIA_TYPE_VIDEO
,
105
.id =
CODEC_ID_DXTORY
,
106
.init =
decode_init
,
107
.close =
decode_close
,
108
.decode =
decode_frame
,
109
.capabilities =
CODEC_CAP_DR1
,
110
};