Support Mono recording devices.

1 files changed, 10 insertions, 1 deletions

diff --git a/localv4ldump b/localv4ldump
index 99efa17..7a00058 100755
--- a/localv4ldump
+++ b/localv4ldump
@@ -80,7 +80,16 @@ i=0
 ainargs=
 amaps=
 for input in $ainputs; do
-	ainargs="${ainargs:+$ainargs }-f alsa -ar 44100 -i hw:$input"
+	# TODO: handle varying descriptions (not just pick first entry)
+	# TODO: handle more descriptions (not just assume stereo)
+	achannels=
+	achannelsdesc="$(amixer -c $input | grep '^  Capture channels:' | head -n 1)"
+	case $achannelsdesc in
+	  *: Mono)
+		achannels=1
+		;;
+	esac
+	ainargs="${ainargs:+$ainargs }-f alsa -ar 44100 ${achannels:+-ac $achannels} -i hw:$input"
 	amaps="${amaps:+$amaps }-map $i:a"
 	((i=i+1))
 done