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libavcodec
xbmenc.c
Go to the documentation of this file.
1
/*
2
* XBM image format
3
*
4
* Copyright (c) 2012 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 "
avcodec.h
"
24
#include "
internal.h
"
25
#include "
mathops.h
"
26
27
#define ANSI_MIN_READLINE 509
28
29
static
int
xbm_encode_frame
(
AVCodecContext
*avctx,
AVPacket
*
pkt
,
30
const
AVFrame
*p,
int
*got_packet)
31
{
32
int
i
, j, l, commas,
ret
,
size
, linesize, lineout, rowsout;
33
uint8_t
*ptr, *buf;
34
35
linesize = lineout = (avctx->
width
+ 7) / 8;
36
commas = avctx->
height
* linesize;
37
38
/* ANSI worst case minimum readline is 509 chars. */
39
rowsout = avctx->
height
;
40
if
(lineout > (
ANSI_MIN_READLINE
/ 6)) {
41
lineout =
ANSI_MIN_READLINE
/ 6;
42
rowsout = (commas + lineout - 1) / lineout;
43
}
44
45
size
= rowsout * (lineout * 6 + 1) + 106;
46
if
((
ret
=
ff_alloc_packet2
(avctx,
pkt
,
size
, 0)) < 0)
47
return
ret
;
48
49
buf =
pkt
->
data
;
50
ptr = p->
data
[0];
51
52
buf +=
snprintf
(buf, 32,
"#define image_width %u\n"
, avctx->
width
);
53
buf +=
snprintf
(buf, 33,
"#define image_height %u\n"
, avctx->
height
);
54
buf +=
snprintf
(buf, 39,
"static unsigned char image_bits[] = {\n"
);
55
for
(
i
= 0, l = lineout;
i
< avctx->
height
;
i
++) {
56
for
(j = 0; j < linesize; j++) {
57
buf +=
snprintf
(buf, 6,
" 0x%02X"
,
ff_reverse
[*ptr++]);
58
if
(--commas <= 0) {
59
buf +=
snprintf
(buf, 2,
"\n"
);
60
break
;
61
}
62
buf +=
snprintf
(buf, 2,
","
);
63
if
(--l <= 0) {
64
buf +=
snprintf
(buf, 2,
"\n"
);
65
l = lineout;
66
}
67
}
68
ptr += p->
linesize
[0] - linesize;
69
}
70
buf +=
snprintf
(buf, 5,
" };\n"
);
71
72
pkt
->
size
= buf -
pkt
->
data
;
73
pkt
->
flags
|=
AV_PKT_FLAG_KEY
;
74
*got_packet = 1;
75
return
0;
76
}
77
78
AVCodec
ff_xbm_encoder
= {
79
.
name
=
"xbm"
,
80
.long_name =
NULL_IF_CONFIG_SMALL
(
"XBM (X BitMap) image"
),
81
.type =
AVMEDIA_TYPE_VIDEO
,
82
.id =
AV_CODEC_ID_XBM
,
83
.encode2 =
xbm_encode_frame
,
84
.pix_fmts = (
const
enum
AVPixelFormat
[]) {
AV_PIX_FMT_MONOWHITE
,
85
AV_PIX_FMT_NONE
},
86
};
AVCodec
AVCodec.
Definition:
codec.h:197
AVPixelFormat
AVPixelFormat
Pixel format.
Definition:
pixfmt.h:64
AVFrame
This structure describes decoded (raw) audio or video data.
Definition:
frame.h:318
internal.h
AVPacket::data
uint8_t * data
Definition:
packet.h:369
ANSI_MIN_READLINE
#define ANSI_MIN_READLINE
Definition:
xbmenc.c:27
ff_reverse
const uint8_t ff_reverse[256]
Definition:
reverse.c:23
AV_PIX_FMT_MONOWHITE
@ AV_PIX_FMT_MONOWHITE
Y , 1bpp, 0 is white, 1 is black, in each byte pixels are ordered from the msb to the lsb.
Definition:
pixfmt.h:75
ff_xbm_encoder
AVCodec ff_xbm_encoder
Definition:
xbmenc.c:78
AV_PKT_FLAG_KEY
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition:
packet.h:410
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition:
frame.h:332
pkt
AVPacket * pkt
Definition:
movenc.c:59
mathops.h
xbm_encode_frame
static int xbm_encode_frame(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *p, int *got_packet)
Definition:
xbmenc.c:29
AVPacket::size
int size
Definition:
packet.h:370
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition:
internal.h:117
size
int size
Definition:
twinvq_data.h:10344
AVPacket::flags
int flags
A combination of AV_PKT_FLAG values.
Definition:
packet.h:375
i
int i
Definition:
input.c:407
uint8_t
uint8_t
Definition:
audio_convert.c:194
AVCodec::name
const char * name
Name of the codec implementation.
Definition:
codec.h:204
AVCodecContext::height
int height
Definition:
avcodec.h:709
AV_CODEC_ID_XBM
@ AV_CODEC_ID_XBM
Definition:
codec_id.h:209
avcodec.h
ret
ret
Definition:
filter_design.txt:187
AVCodecContext
main external API structure.
Definition:
avcodec.h:536
AV_PIX_FMT_NONE
@ AV_PIX_FMT_NONE
Definition:
pixfmt.h:65
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition:
avutil.h:201
AVPacket
This structure stores compressed data.
Definition:
packet.h:346
AVCodecContext::width
int width
picture width / height.
Definition:
avcodec.h:709
AVFrame::linesize
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition:
frame.h:349
ff_alloc_packet2
int ff_alloc_packet2(AVCodecContext *avctx, AVPacket *avpkt, int64_t size, int64_t min_size)
Check AVPacket size and/or allocate data.
Definition:
encode.c:33
snprintf
#define snprintf
Definition:
snprintf.h:34
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