/usr/bin/xscreensaver-getimage-video is in xscreensaver-data 5.36-1ubuntu1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 | #!/usr/bin/perl -w
# Copyright © 2001-2015 Jamie Zawinski <jwz@jwz.org>.
#
# Permission to use, copy, modify, distribute, and sell this software and its
# documentation for any purpose is hereby granted without fee, provided that
# the above copyright notice appear in all copies and that both that
# copyright notice and this permission notice appear in supporting
# documentation. No representations are made about the suitability of this
# software for any purpose. It is provided "as is" without express or
# implied warranty.
#
# This program attempts to grab a single frame of video from the system's
# video capture card, and then load it on to the root window using the
# "xscreensaver-getimage-file" program. Various frame-grabbing programs
# are known, and the first one found is used.
#
# The various xscreensaver hacks that manipulate images ("slidescreen",
# "jigsaw", etc.) get the image to manipulate by running the
# "xscreensaver-getimage" program.
#
# The various screen savers invoke "xscreensaver-getimage", which will in
# turn invoke this program, depending on the value of the "grabVideoFrames"
# setting in the ~/.xscreensaver file (or in the app-defaults file, usually
# /usr/lib/X11/app-defaults/XScreenSaver).
#
# Created: 13-Apr-2001.
require 5;
#use diagnostics; # Fails on some MacOS 10.5 systems
use strict;
my $progname = $0; $progname =~ s@.*/@@g;
my $version = q{ $Revision: 1.23 $ }; $version =~ s/^[^0-9]+([0-9.]+).*$/$1/;
my $tmpdir = $ENV{TMPDIR} || "/tmp";
my $tmpfile = sprintf("%s/xssv.%08x.ppm", $tmpdir, rand(0xFFFFFFFF));
my $tmpfile1 = sprintf ("%s/xssgv01.ppm", $tmpdir, rand(0xFFFFFFFF));
my $tmpfile3 = sprintf ("%s/xssgv03.ppm", $tmpdir, rand(0xFFFFFFFF));
my $verbose = 0;
# These are programs that can be used to grab a video frame. The first one
# of these programs that exists on $PATH will be used, and the image file
# is assumed to be written to $tmpfile (in some image format acceptable to
# "xscreensaver-getimage-file", e.g., PPM or JPEG.)
#
# If you add other programs to this list, please let me know!
#
my @programs = (
"streamer -a -t3 -r1 -o $tmpfile1; mv $tmpfile3 $tmpfile", # XawTV after 2 sec
"bttvgrab -d q -Q -l 1 -o ppm -f $tmpfile", # BTTV
"qcam > $tmpfile", # Connectix Qcam
"gqcam -t PPM -d $tmpfile", # GTK+ Qcam clone
"v4lctl snap ppm full $tmpfile", # XawTV 3.94.
"streamer -a -s 768x576 -o $tmpfile", # XawTV
# the "-a" option ("mute audio") arrived with XawTV 3.76.
"atitv snap $tmpfile", # ATI video capture card
"grab -type ppm -format ntsc -source 1 " . # *BSD BT848 module
"-settle 0.75 -output $tmpfile",
"motioneye -j $tmpfile", # Sony Vaio MotionEye
# (hardware jpeg encoder)
"vidcat -b -f ppm -s 640x480 > $tmpfile 2>&-", # w3cam/ovcam
"vidtomem -f $tmpfile 2>&- " . # Silicon Graphics
"&& mv $tmpfile-00000.rgb $tmpfile",
# Maybe this works?
# "ffmpeg -i /dev/video0 -ss 00:00:01 -vframes 1 $tmpfile 2>&-",
# "mplayer -really-quiet tv://0 " . # Maybe works with some cams?
# "-ao null -vo pnm -frames 1 2>&- " .
# "&& mv 00000001.ppm $tmpfile",
);
sub error($) {
my ($e) = @_;
print STDERR "$progname: $e\n";
exit 1;
}
sub pick_grabber() {
my @names = ();
foreach my $cmd (@programs) {
$_ = $cmd;
my ($name) = m/^([^ ]+)/;
push @names, "\"$name\"";
print STDERR "$progname: looking for $name...\n" if ($verbose > 2);
foreach my $dir (split (/:/, $ENV{PATH})) {
print STDERR "$progname: checking $dir/$name\n" if ($verbose > 3);
if (-x "$dir/$name") {
return $cmd;
}
}
}
$names[$#names] = "or " . $names[$#names];
error ("none of: " . join (", ", @names) . " were found on \$PATH.");
}
sub grab_image() {
my $cmd = pick_grabber();
unlink $tmpfile;
print STDERR "$progname: executing \"$cmd\"\n" if ($verbose);
system ($cmd);
if (! -s $tmpfile) {
unlink $tmpfile;
error ("\"$cmd\" produced no data.");
}
print STDERR "$progname: wrote \"$tmpfile\"\n" if ($verbose);
print STDOUT "$tmpfile\n";
}
sub usage() {
print STDERR "usage: $progname [--verbose] [--name | --stdout]\n";
exit 1;
}
sub main() {
while ($_ = $ARGV[0]) {
shift @ARGV;
if (m/^--?verbose$/s) { $verbose++; }
elsif (m/^-v+$/s) { $verbose += length($_)-1; }
elsif (m/^--?name$/s) { } # ignored, for compatibility
elsif (m/^-./) { usage; }
else { usage; }
}
grab_image();
}
main;
exit 0;
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