FFmpeg
Main Page
Related Pages
Modules
Namespaces
Data Structures
Files
Examples
File List
Globals
All
Data Structures
Namespaces
Files
Functions
Variables
Typedefs
Enumerations
Enumerator
Macros
Groups
Pages
libavfilter
lavfutils.c
Go to the documentation of this file.
1
/*
2
* Copyright 2012 Stefano Sabatini <stefasab gmail com>
3
*
4
* This file is part of FFmpeg.
5
*
6
* FFmpeg is free software; you can redistribute it and/or
7
* modify it under the terms of the GNU Lesser General Public
8
* License as published by the Free Software Foundation; either
9
* version 2.1 of the License, or (at your option) any later version.
10
*
11
* FFmpeg is distributed in the hope that it will be useful,
12
* but WITHOUT ANY WARRANTY; without even the implied warranty of
13
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14
* Lesser General Public License for more details.
15
*
16
* You should have received a copy of the GNU Lesser General Public
17
* License along with FFmpeg; if not, write to the Free Software
18
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19
*/
20
21
#include "
libavutil/imgutils.h
"
22
#include "
lavfutils.h
"
23
24
int
ff_load_image
(
uint8_t
*
data
[4],
int
linesize[4],
25
int
*w,
int
*h,
enum
AVPixelFormat
*
pix_fmt
,
26
const
char
*filename,
void
*log_ctx)
27
{
28
AVInputFormat
*
iformat
= NULL;
29
AVFormatContext
*format_ctx = NULL;
30
AVCodec
*codec;
31
AVCodecContext
*codec_ctx;
32
AVFrame
*
frame
;
33
int
frame_decoded,
ret
= 0;
34
AVPacket
pkt
;
35
36
av_register_all
();
37
38
iformat =
av_find_input_format
(
"image2"
);
39
if
((ret =
avformat_open_input
(&format_ctx, filename, iformat, NULL)) < 0) {
40
av_log
(log_ctx,
AV_LOG_ERROR
,
41
"Failed to open input file '%s'\n"
, filename);
42
return
ret
;
43
}
44
45
codec_ctx = format_ctx->
streams
[0]->
codec
;
46
codec =
avcodec_find_decoder
(codec_ctx->
codec_id
);
47
if
(!codec) {
48
av_log
(log_ctx,
AV_LOG_ERROR
,
"Failed to find codec\n"
);
49
ret =
AVERROR
(EINVAL);
50
goto
end
;
51
}
52
53
if
((ret =
avcodec_open2
(codec_ctx, codec, NULL)) < 0) {
54
av_log
(log_ctx,
AV_LOG_ERROR
,
"Failed to open codec\n"
);
55
goto
end
;
56
}
57
58
if
(!(frame =
avcodec_alloc_frame
()) ) {
59
av_log
(log_ctx,
AV_LOG_ERROR
,
"Failed to alloc frame\n"
);
60
ret =
AVERROR
(ENOMEM);
61
goto
end
;
62
}
63
64
ret =
av_read_frame
(format_ctx, &pkt);
65
if
(ret < 0) {
66
av_log
(log_ctx,
AV_LOG_ERROR
,
"Failed to read frame from file\n"
);
67
goto
end
;
68
}
69
70
ret =
avcodec_decode_video2
(codec_ctx, frame, &frame_decoded, &pkt);
71
if
(ret < 0 || !frame_decoded) {
72
av_log
(log_ctx,
AV_LOG_ERROR
,
"Failed to decode image from file\n"
);
73
goto
end
;
74
}
75
ret = 0;
76
77
*w = frame->
width
;
78
*h = frame->
height
;
79
*pix_fmt = frame->
format
;
80
81
if
((ret =
av_image_alloc
(data, linesize, *w, *h, *pix_fmt, 16)) < 0)
82
goto
end
;
83
ret = 0;
84
85
av_image_copy
(data, linesize, (
const
uint8_t
**)frame->
data
, frame->
linesize
, *pix_fmt, *w, *h);
86
87
end
:
88
avcodec_close
(codec_ctx);
89
avformat_close_input
(&format_ctx);
90
av_freep
(&frame);
91
92
if
(ret < 0)
93
av_log
(log_ctx,
AV_LOG_ERROR
,
"Error loading image file '%s'\n"
, filename);
94
return
ret
;
95
}
Generated on Wed Jul 10 2013 23:48:09 for FFmpeg by
1.8.2