#!/usr/bin/perl
# script to create mpg stream files from jpeg files in a directory
# May 21 2006
# D. Scott Barninger
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public
# License version 2 as published by the Free Software Foundation.
#
# 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.

# check how we were called
if ( ! $ARGV[0] ) {
	print "Usage: create_stream /path/ frames\n";
	exit;
}
if ( ! $ARGV[1] ) {
	print "Usage: create_stream /path/ frames\n";
	exit;
}

# full path with trailing / to directory containing jpg files
my($filepath) = $ARGV[0];
# number of frames in the mpg stream
my($frames) = $ARGV[1];

# make sure path has a trailing slash
if ( substr($filepath,-1,1) ne "/" ) {
	print "Error: Path must include trailing slash.\n";
	exit;
}

my @filelist = &get_files($filepath);
my $oldfile;
my $newfile;
my $basename;
my $count = 0;

foreach $oldfile (@filelist) {
	$basename = $oldfile;
	$basename =~ s/.jpg//g;
	$newfile = "$basename.mpg";
	print "Creating $newfile\n";
	system("jpeg2yuv -n $frames -I p -f 29.97 -j $oldfile | mpeg2enc -f 8 -o $newfile");
	$count++;
}

print "Created $count mpg files.\n\n";


# Get all the files in a path except . and ..
sub get_files {
	($path) = @_;

	my $file;
	my @list;

	opendir( DIR, $path );
	my @files = sort { uc($a) cmp uc($b) } readdir(DIR);
	closedir DIR;

	foreach $file (@files) {
		if ($file eq "." || $file eq "..") {
			next;
		}
		else {
		push (@list, $file);
		}
	}
	return(@list);
}