[Sugar-devel] [PATCH Etoys] Use ALSA sound backend if available

[Daniel Drake]

Extend the sound backend selection code to consider using ALSA.
On XO-1.75 and XO-4 this fixes sound in etoys with squeak-vm-4.x.
It also fixes XO-4 sound recording which was not working on any previous
version.

Index: etoys-5.0.2408/etoys.in
===================================================================
--- etoys-5.0.2408.orig/etoys.in	2013-03-27 15:06:22.000000000 -0400
+++ etoys-5.0.2408/etoys.in	2013-03-27 15:06:33.000000000 -0400
@@ -6,6 +6,7 @@
 
 VM="squeak"
 VMOPTIONS="-encoding UTF-8 -vm-display-x11 -xshm"
+VMSOUND=""
 IMAGE="@prefix@/share/etoys/etoys.image"
 IMOPTIONS=""
 DOCUMENT=""
@@ -85,18 +86,24 @@
 # make Compose input methods work
 [ -z "$LC_ALL" ] && export LC_ALL="$LANG"
 
-# if pulseaudio is running, use it if VM has the driver, or fall back to OSS
+# if pulseaudio is running, use it if VM has the driver
 if pulseaudio --check 2>/dev/null ; then
     if "$VM" -help 2> /dev/null | grep -q vm-sound-pulse ; then
-        VMOPTIONS="$VMOPTIONS -vm-sound-pulse"
+        VMSOUND="-vm-sound-pulse"
     else
-        VMOPTIONS="$VMOPTIONS -vm-sound-oss"
         if padsp true 2>/dev/null ; then
+            VMSOUND="-vm-sound-oss"
             WRAPPER=padsp
         fi
     fi
 fi
 
+# Otherwise use ALSA if available
+[ -z "$VMSOUND" -a -e /proc/asound/cards ] && VMSOUND="-vm-sound-ALSA"
+
+# Fall back on OSS
+[ -n "$VMSOUND" ] || VMSOUND="-vm-sound-oss"
+
 # enable compositioninput 
 case "$LANG" in 
     bn* | gu* | hi* | kn* | ml* | mr* | ta* | te* | sa* )
@@ -110,5 +117,5 @@
 
 # VM, Image, and Document are non-optional
 # Document has to be present even if empty for IMOPTIONS to work
-$DEBUG $WRAPPER "$VM" $VMOPTIONS "$IMAGE" "$DOCUMENT" $IMOPTIONS
-exec $WRAPPER "$VM" $VMOPTIONS "$IMAGE" "$DOCUMENT" $IMOPTIONS
+$DEBUG $WRAPPER "$VM" $VMOPTIONS $VMSOUND "$IMAGE" "$DOCUMENT" $IMOPTIONS
+exec $WRAPPER "$VM" $VMOPTIONS $VMSOUND "$IMAGE" "$DOCUMENT" $IMOPTIONS