From b53bd801ec9d27eb8c98dc286cf288be72f6e7ef Mon Sep 17 00:00:00 2001
From: "B. Watson" <urchlay@slackware.uk>
Date: Sun, 7 Apr 2024 17:32:45 -0400
Subject: soxdial: add silence between dial strings, implement dialtone.

---
 soxdial | 62 +++++++++++++++++++++++++++++++++++++++++---------------------
 1 file changed, 41 insertions(+), 21 deletions(-)

(limited to 'soxdial')

diff --git a/soxdial b/soxdial
index 29a66ee..a590df5 100755
--- a/soxdial
+++ b/soxdial
@@ -32,10 +32,6 @@ before any dial strings or dial options.
 
 =over 4
 
-=item B<-l> I<sec>, B<--length> I<sec>
-
-Sets the time each digit's tones are played. Default is 0.25.
-
 =item B<-o> I<output>, B<--output> I<output>
 
 Write sox's output to a file, rather than playing it. The file format
@@ -86,6 +82,10 @@ dial strings, until the same option is seen again.
 
 =over 4
 
+=item B<-l> I<sec>, B<--length> I<sec>
+
+Sets the time each digit's tones are played. Default is 0.25.
+
 =item B<-d> I<sec>, B<--delay> I<sec>
 
 Sets the delay between consecutive digits. Default is 0.1.
@@ -166,6 +166,7 @@ $pausetime = 0.5;
 $digittime = 0.25;
 $intertime = 0.1;
 $bits = 8;
+$encoding = "-eun";
 $rate = 8000;
 $output = "-d";
 
@@ -191,10 +192,6 @@ sub letter2number {
 # sox -n -d synth 0.25 sine 697 sine 1209 sine 770 sine 1477 delay 0 0 .35 .35 remix -
 # ...plays DTMF 1 and 6, for 0.25 sec each, with a 0.10 sec delay between them.
 
-# ( sox -n -p synth 2 sine 350 sine 440; sox -n -p synth 2 sine 697 sine 1209 ) | sox -G -p -d
-# ...plays 2 sec of dialtone followed by 2 sec of DTMF key 1. Change the -d
-# to 1.wav to save to a file. Prefix it with -rXXXX -sX if needed.
-
 sub add_digit {
 	my $d = shift;
 	if($d eq ',') {
@@ -219,11 +216,12 @@ sub add_digit {
 	warn "$SELF: added digit '$d', time now $time\n" if $verbose;
 }
 
-sub make_sox_cmd {
-	if($output eq '-') {
-		$output = "-t raw $output";
-	}
-	my $cmd = "sox -n -b$bits -r$rate -c1 $output ";
+# ( sox -n -p synth 2 sine 350 sine 440; sox -n -p synth 2 sine 697 sine 1209 ) | sox -G -p -d
+# ...plays 2 sec of dialtone followed by 2 sec of DTMF key 1. Change the -d
+# to 1.wav to save to a file. Prefix it with -rXXXX -sX if needed.
+
+sub make_sox_subcmd {
+	my $cmd = "sox -n -b$bits $encoding -r$rate -c1 -traw - ";
 	my $synth = " synth $digittime ";
 	my $delay = "delay ";
 
@@ -236,7 +234,26 @@ sub make_sox_cmd {
 		$delay .= "$d $d ";
 	}
 
-	return $cmd . $synth . $delay . " remix -";
+	$time = 0;
+	@freqs1 = @freqs2 = @delays = ();
+	return $cmd . $synth . $delay;
+}
+
+sub silence_subcmd {
+	return "sox -n -b$bits $encoding -r$rate -c1 -traw - trim 0 $intertime";
+}
+
+sub dialtone_subcmd {
+	return "sox -n -b$bits $encoding -r$rate -c1 -traw - synth $_[0] sine 350 sine 440";
+}
+
+sub make_sox_cmd {
+	if($output eq '-') {
+		$output = "-t raw $output";
+	}
+	my $cmd = "sox -traw -b$bits $encoding -r$rate -c1 - $output ";
+	my $subcmds = join(" ; ", @sox_subcmds);
+	return "( " . $subcmds . " ) | " . $cmd;
 }
 
 # main()
@@ -267,16 +284,17 @@ for ($argc = 0; $argc < @ARGV; $argc++) {
 		warn "$SELF: output set to '$output'\n" if $verbose;
 	} elsif(/^--?b(?:its)?$/) {
 		$bits = $ARGV[++$argc];
-		if($bits != 8 && $bits != 16) {
+		if($bits == 8) {
+			$encoding = "-eun";
+		} elsif($bits == 16) {
+			$encoding = "-esig";
+		} else {
 			die "$SELF: bad -b/--bits, only 8 or 16 is allowed.\n";
 		}
 		warn "$SELF: bits set to '$bits'\n" if $verbose;
 	} elsif(/^--?r(?:ate)?$/) {
 		$rate = $ARGV[++$argc];
 	} elsif(/^--?l(?:ength)?$/) {
-		if(@freqs1) {
-			die "$SELF: can't change length after a dial string\n";
-		}
 		$digittime = $ARGV[++$argc];
 		warn "$SELF: digittime set to '$digittime'\n" if $verbose;
 	} elsif(/^--?(?:x|extended)$/) {
@@ -292,7 +310,7 @@ for ($argc = 0; $argc < @ARGV; $argc++) {
 		$pausetime = $ARGV[++$argc];
 		warn "$SELF: comma delay set to '$pausetime'\n" if $verbose;
 	} elsif(/^--?(?:t|dialtone)$/) {
-		die "$SELF: -t/--dialtone option not yet implemented.\n";
+		push @sox_subcmds, dialtone_subcmd($ARGV[++$argc]);
 	} else {
 		warn "$SELF: start dial string '$_'\n" if $verbose;
 		for (split "", $_) {
@@ -306,11 +324,13 @@ for ($argc = 0; $argc < @ARGV; $argc++) {
 			add_digit($digit);
 		}
 		warn "$SELF: end dial string '$_'\n" if $verbose;
+		push @sox_subcmds, make_sox_subcmd();
+		push @sox_subcmds, silence_subcmd();
 	}
 }
 
-if(!@freqs1) {
-	die "$SELF: no digits to dial.\n";
+if(!@sox_subcmds) {
+	die "$SELF: no digits or dialtone to generate.\n";
 }
 
 my $cmd = make_sox_cmd();
-- 
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