#!/usr/bin/perl

use threads;

my $cpus	= get_cpus();
my @toencode	= get_wavs();
my $encode	= 'flac';
my @encflags	= ('-8', '-s', '-V');
#my @encflags	= ('--silent', '--r3mix');
#my @encflags	= ('--silent', '--preset','extreme');
my ($thr, @thr, $source);


while (@toencode) {
	while ($thr < $cpus && @toencode) {
		$source = shift @toencode;
		$source && push @thr, threads->create('do_encode',$encode, $encflags, $source);
		$thr++;
	}

	sleep .5;

	$thr=threads->list(threads::running);
}

#system('metaflac','--add-replay-gain',map {s/wav/flac/;} @toencode);

# they should now all have either finished or started
# their binary in a thread. Wait until they don't block
# and then join (ie wait) on them

while ($thr>0 && threads->list(threads::running)) {
	
	sleep 1;

	for my $thread (@thr) {
		if ($thread->is_joinable()) {
			$thr++;
			$thread->join();
		}
	}
}

sub get_wavs {
	my @wavs;

	opendir(D,$ARGV[0] || '.') || die "$?";
	@wavs = grep /\.wav$/,(readdir(D));
	closedir(D);

	return @wavs;
}

sub get_cpus {
	open(C,"/proc/cpuinfo");
	my $cpus = scalar grep /^processor/, <C>;
	close(C);

	return $cpus;
}

sub do_encode {
	my ($command, $flags, $source, $dest) = @_;
	print "Encoding $source...\n";
	return system($command, @encflags, $source);
}