#!/usr/bin/perl -w
-# Copyright © 2001, 2002, 2003, 2005 Jamie Zawinski <jwz@jwz.org>.
+# Copyright © 2001-2013 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
# "jigsaw", etc.) get the image to manipulate by running the
# "xscreensaver-getimage" program.
#
-# "xscreensaver-getimage" will invoke this program, depending on the
-# value of the "grabVideoFrames" setting in the ~/.xscreensaver file
-# (or in /usr/lib/X11/app-defaults/XScreenSaver).
+# 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;
+#use diagnostics; # Fails on some MacOS 10.5 systems
use strict;
my $progname = $0; $progname =~ s@.*/@@g;
-my $version = q{ $Revision: 1.14 $ }; $version =~ s/^[^0-9]+([0-9.]+).*$/$1/;
+my $version = q{ $Revision: 1.22 $ }; $version =~ s/^[^0-9]+([0-9.]+).*$/$1/;
-my $verbose = 0;
+my $tmpdir = $ENV{TMPDIR} || "/tmp";
+my $tmpfile = sprintf("%s/xssv.%08x.ppm", $tmpdir, rand(0xFFFFFFFF));
-my $tmpdir = $ENV{TMPDIR} || "/tmp";
-my $tmpfile = sprintf ("%s/xssgv.%08x.ppm", $tmpdir, rand(0xFFFFFFFF));
+my $verbose = 0;
# These are programs that can be used to grab a video frame. The first one
"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.
"vidtomem -f $tmpfile 2>&- " . # Silicon Graphics
"&& mv $tmpfile-00000.rgb $tmpfile",
+
+ # "mplayer -really-quiet tv://0 " . # Maybe works with some cams?
+ # "-ao null -vo pnm -frames 1 2>&- " .
+ # "&& mv 00000001.ppm $tmpfile",
+
);
-sub error {
- ($_) = @_;
- print STDERR "$progname: $_\n";
+sub error($) {
+ my ($e) = @_;
+ print STDERR "$progname: $e\n";
exit 1;
}
-my $displayer = undef;
-
-sub pick_grabber {
+sub pick_grabber() {
my @names = ();
foreach my $cmd (@programs) {
foreach my $dir (split (/:/, $ENV{PATH})) {
print STDERR "$progname: checking $dir/$name\n" if ($verbose > 3);
if (-x "$dir/$name") {
- $displayer = $name;
return $cmd;
}
}
}
$names[$#names] = "or " . $names[$#names];
- error "none of: " . join (", ", @names) . " were found on \$PATH.";
+ error ("none of: " . join (", ", @names) . " were found on \$PATH.");
}
-my $use_stdout_p = 0;
-my $return_filename_p = 0;
-
-sub grab_image {
+sub grab_image() {
my $cmd = pick_grabber();
unlink $tmpfile;
print STDERR "$progname: executing \"$cmd\"\n" if ($verbose);
system ($cmd);
- if (-z $tmpfile)
- {
- unlink $tmpfile;
- error "\"$cmd\" produced no data.";
- }
-
- if ($return_filename_p) {
- print STDERR "$progname: wrote \"$tmpfile\"\n" if ($verbose);
- print STDOUT "$tmpfile\n";
-
- } elsif ($use_stdout_p) {
- local *IN;
- my $ppm = "";
- my $reader = "<$tmpfile";
-
- # horrid kludge for SGIs, since they don't use PPM...
- if ($displayer eq "vidtomem") {
- $reader = "sgitopnm $tmpfile";
- $reader .= " 2>/dev/null" if ($verbose <= 1);
- $reader .= " |";
- }
-
- open(IN, $reader) || error "reading $tmpfile: $!";
- print STDERR "$progname: reading $tmpfile\n" if ($verbose > 1);
- while (<IN>) { $ppm .= $_; }
- close IN;
- unlink $tmpfile;
- print STDOUT $ppm;
-
- } else {
-
- $cmd = "xscreensaver-getimage-file";
- $cmd .= " --verbose" if ($verbose);
- $cmd .= " $tmpfile";
-
- print STDERR "$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 {
+sub usage() {
print STDERR "usage: $progname [--verbose] [--name | --stdout]\n";
exit 1;
}
-sub main {
+sub main() {
while ($_ = $ARGV[0]) {
shift @ARGV;
- if ($_ eq "--verbose") { $verbose++; }
- elsif (m/^-v+$/) { $verbose += length($_)-1; }
- elsif (m/^--?stdout$/) { $use_stdout_p = 1; }
- elsif (m/^--?name$/) { $return_filename_p = 1; }
- elsif (m/^-./) { usage; }
- else { usage; }
+ if (m/^--?verbose$/s) { $verbose++; }
+ elsif (m/^-v+$/s) { $verbose += length($_)-1; }
+ elsif (m/^--?name$/s) { } # ignored, for compatibility
+ elsif (m/^-./) { usage; }
+ else { usage; }
}
-
grab_image();
}