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#!/usr/bin/perl
#
# Script to create a slideshow from Xastir snapshot images. Note
# that this script is Unix/Linux-centric due to the use of the $HOME
# variable and the use of the "cp" command.
#
# Written 20090415 by Curt Mills, WE7U
#
# Copyright (C) 2000-2023 The Xastir Group
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
# 02111-1307, USA.
#
#
# Copies/renames ~/.xastir/tmp/snapshot.png files so that a
# slideshow can be created from the images at a later date. The
# script monitors the input directory. Any new snapshot.png file
# that appears is allowed to age for a few seconds to make sure that
# Xastir is done writing the file, then the file is copied to the
# ~/.xastir/tmp/slideshow/ directory as a numbered file. See below
# for one method for turning these files into an animated GIF, or
# else bring them up in some slideshow program and display them in
# numerical order. The name of the file contains the Unix Epoch
# timestamp (the exact second that the file was made).
#
#
# A note from Carl Makin, vk1kcm, modified slightly by Curt, we7u,
# regarding creation of an animated GIF from the slideshow images:
#
# -------------------------------------------------------------------
# This will create an animated gif that loops in your browser.
# gm convert -delay 20 -loop snapshot*.png animation.gif
# See:
# http://www.graphicsmagick.org/FAQ.html#how-do-i-create-a-gif-animation-sequence-to-display-within-netscape
# I think you can also great mpegs by changing the filename to "animation.mpg".
# -------------------------------------------------------------------
#
$home = $ENV{"HOME"};
$input_dir = "$home/.xastir/tmp";
$output_dir = "$input_dir/slideshow";
# Create the slideshow directory if it doesn't exist
mkdir $output_dir;
chdir $input_dir;
while (1) {
$current_time = time;
# Snag the age of the existing snapshot.png file
$number = (stat("snapshot.png"))[9];
$difference = $current_time - $number;
# If the age of the file is more than 15 seconds but less than 31
# minutes, copy the file to the slideshow directory and rename it
# along the way. Note that Xastir can produce snapshots at a rate
# of between one per minute, and one per 30 minutes.
#
if ( ($difference > 15) && ($difference < (31 * 60)) ) {
# Copy the snapshot image to the slideshow directory, renaming
# it with the Unix Epoch time, something like: "1239897417.png".
# Only copies the file if the source file is newer than the
# destination, which prevents copying the file again and again
# if it's the last file in your sequence.
#
`cp -u snapshot.png $output_dir/$number.png`;
}
sleep 30;
}
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