Add continuous announcement server.

bin/announcement-server

@@ -0,0 +1,21 @@
+#!/bin/bash
+
+source pa-lib
+
+while [[ true ]]; do
+	# waiting for the PSA text stream to start
+	read
+
+	pa-preheat
+	pa-announcement
+	pa-say "$REPLY"
+	while read -t 4; do
+		pa-say "$REPLY"
+	done
+
+	# no more text, terminate the PSA
+	pa-announcement-quick
+	pa-shutdown
+done
+
+

bin/pa-lib

@@ -7,12 +7,15 @@ export SOUNDS=$ROOT/sounds
 export PLAYER=mplayer
 export SPEAK=espeak-ng
 
+ALARM_PID=-1
+STATIC_PID=-1
+
 function info() {
 	echo "[INFO]" $@
 }
 
 function play() {
-	$PLAYER $@ > /dev/null 2>&1
+	cat /dev/null | $PLAYER $@ > /dev/null 2>&1
 }
 
 function pa-volume() {
@@ -49,7 +52,8 @@ function pa-preheat() {
 	info "PA Preheating"
 	pa-power off
 	pa-volume-normal
-	play $SOUNDS/announcement_4-tone_up_quickest.ogg
+	pa-static-start 40
+	play $SOUNDS/announcement_4-tone_up_quick.ogg
 	pa-power on
 	info "PA Ready"
 }
@@ -58,7 +62,7 @@ function pa-shutdown() {
 	info "PA Shutdown"
 	pa-power off
 	pa-volume-normal
-	killall $PLAYER
+	killall $PLAYER >/dev/null 2>&1
 }
 
 function pa-announcement() {
@@ -78,17 +82,28 @@ function pa-announcement-quickest() {
 
 function pa-alarm-start() {
 	info "Alarm started"
+	kill $ALARM_PID 2>/dev/null
 	play -loop 0 $SOUNDS/alarm_simple.ogg &
+	ALARM_PID=$!
 }
 
 function pa-alarm-stop() {
 	info "Alarm stopped"
-	killall $PLAYER
+	kill $ALARM_PID 2>/dev/null
+}
+
+function pa-static-start() {
+	kill $STATIC_PID 2>/dev/null
+	play -loop 0 -volume ${1:--1} -softvol $SOUNDS/static.ogg &
+	STATIC_PID=$!
+}
+function pa-static-stop() {
+	kill $STATIC_PID 2>/dev/null
 }
 
 function pa-say() {
 	info "Say: $@"
-	$SPEAK "$@"
+	cat /dev/null | $SPEAK "$@"
 }