blob: 34ed8d55c22619164fb46bfccad372c327c8a16c (
plain)
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
|
#!/bin/bash
#
# requires: *topnm, pnmpad, pnmscale, ppmntsc, ppmtoy4m, mpeg2enc,
# mktemp, awk, file
#
# video format. pal or ntsc
FORMAT=pal
# target image width/height (taking into account visible screen area)
if [ "$FORMAT" = "ntsc" ]; then
TW=600
TH=420
else
TW=632
TH=512
fi
TMP=$(mktemp ${TMPDIR:-/tmp}/image_convert.pnm.XXXXXX) || exit 2
IMG=$1
MPG=$2
DIR=$(dirname "$MPG")
if [ ! -d "$DIR" ]; then
mkdir -p "$DIR" || exit 2
fi
trap cleanup EXIT
cleanup()
{
[ -z "$TMP" ] || rm -f "$TMP"
}
#
# get the file type and set the according converter to PNM
#
FILE_TYPE=$(file -i -L -b "$IMG" 2>/dev/null | cut -f2 -d/)
case "$FILE_TYPE" in
jpg | jpeg)
TO_PNM=jpegtopnm
;;
tiff)
TO_PNM=tifftopnm
;;
bmp | x-bmp)
TO_PNM=bmptoppm
;;
png | x-png)
TO_PNM=pngtopnm
;;
Netpbm | pnm | x-portable-pixmap)
TO_PNM=cat
;;
gif)
TO_PNM=giftopnm
;;
*)
echo "filetype '$FILE_TYPE' is not supported"
exit 1
;;
esac
#
# extract the image size & compute scale value
#
LANG=C # get the decimal point right
$TO_PNM "$IMG" >"$TMP" 2>/dev/null
S=$(pnmfile "$TMP" | awk '{ printf "%d %d ",$4,$6 }')
S=$(echo $S $TW $TH | awk '{ sw=$3/$1; sh=$4/$2; s=(sw<sh)?sw:sh; printf "%.4f\n",(s>1)?1.0:s; }')
#
# now run the conversion
#
if [ "$FORMAT" = "ntsc" ]; then
pnmscale $S "$TMP" | \
pnmpad -black -width 704 -height 480 | \
ppmntsc | \
ppmtoy4m -v 0 -n 1 -r -S 420mpeg2 -F 30000:1001 | \
mpeg2enc -f 7 -T 90 -F 4 -nn -a 2 -v 0 -o "$MPG"
else
pnmscale $S "$TMP" | \
pnmpad -black -width 704 -height 576 | \
ppmntsc --pal | \
ppmtoy4m -v 0 -n 1 -r -S 420mpeg2 -F 25:1 | \
mpeg2enc -f 7 -T 90 -F 3 -np -a 2 -v 0 -o "$MPG"
fi
|
