soxdial: add --left --right --stereo options.

1 files changed, 35 insertions, 1 deletions

diff --git a/soxdial b/soxdial
index 0c3967e..e07b752 100755
--- a/soxdial
+++ b/soxdial
@@ -28,6 +28,9 @@ to the layout of a touchtone phone (e.g. A = 2, M = 6, etc). If the
 extended touchtone digits A, B, C, and D are needed, they can be
 enabled with the B<-x>, B<--extended> option (see below).
 
+The generated audio is monophonic, though stereo output files can be
+created with the B<-S>, B<-L>, or B<-R> options (see below).
+
 =head1 OPTIONS
 
 Note that option bundling is not supported. Use e.g. B<-v -n>, not B<-vn>. Also,
@@ -66,6 +69,22 @@ Set the bits per sample. Default is 8. The only other choice is 16.
 as signed. If this option is used, it B<must> occur on the command
 line B<before> any dial string.
 
+=item B<-S>, B<--stereo>
+
+Output stereo audio. The left and right channels will contain the same
+audio. Use this if you're importing the audio into some other piece of
+software that expects stereo input files.
+
+=item B<-L>, B<--left>
+
+Output stereo audio, with the generated tones on the left channel and silence
+on the right channel.
+
+=item B<-R>, B<--right>
+
+Output stereo audio, with the generated tones on the right channel and silence
+on the left channel.
+
 =item B<-v>, B<--verbose>
 
 Print verbose information, including the generated B<sox> command, on standard
@@ -358,7 +377,14 @@ sub make_sox_cmd {
 		$output =~ s,",\\",g;
 		$output = "\"$output\"";
 	}
-	my $cmd = "sox -traw -b$bits $encoding -r$rate -c1 - $output ";
+	my $ch = $stereo ? "channels 2" : "";
+	my $remix = "";
+	if($left) {
+		$remix = "remix 1 1v0";
+	} elsif($right) {
+		$remix = "remix 1v0 1";
+	}
+	my $cmd = "sox -traw -b$bits $encoding -r$rate -c1 - $output $ch $remix";
 	my $subcmds = join(" ; ", @sox_subcmds);
 	return "( " . $subcmds . " ) | " . $cmd;
 }
@@ -459,6 +485,14 @@ for ($argc = 0; $argc < @ARGV; $argc++) {
 		push @sox_subcmds, dialtone_subcmd(parse_sec($ARGV[++$argc]));
 	} elsif(/^--?s(?:ilence)?$/) {
 		push @sox_subcmds, silence_subcmd(parse_sec($ARGV[++$argc]));
+	} elsif(/^--?(?:S|stereo)$/) {
+		$stereo = 1;
+	} elsif(/^--?(?:L|left)$/) {
+		$right = 0;
+		$stereo = $left = 1;
+	} elsif(/^--?(?:R|right)$/) {
+		$left = 0;
+		$stereo = $right = 1;
 	} else {
 		warn "$SELF: start dial string '$_'\n" if $verbose;
 		for (split "", $_) {