added app-volume.sh

README.md

@@ -3,3 +3,5 @@
 This script will create a virtual microphone for PulseAudio to use and set it as the default device, playing an mp3 file in a loop
 ## test-sd-x.sh
 This script I use for testing SD cards / USB sticks for fakes or bad blocks
+## app-volume.sh
+This script allows to list and set volumes for apps

app-volume.sh

@@ -0,0 +1,63 @@
+#!/bin/bash
+## script description
+# this script allows to 
+# - list the application sinks
+# - set the volume for an application sink by application name
+# based on https://askubuntu.com/a/1418749
+
+## global variables
+SCRIPT=`basename $0`
+DEBUG=false
+
+(${DEBUG}) && echo "debug mode active"
+(${DEBUG}) && set -x
+
+#warning, this will terminate the script on errors
+#do not use this if errors are expected behavior!
+set -e
+
+## display usage on invalid amount of arguments or help arguments
+function usage() {
+  echo "usage: $SCRIPT {list|set <app> <volume>}"
+  echo "arguments"
+  echo "  argument            argument description"
+  echo "  list                list app sinks"
+  echo "  set <app> <volume>  set volume for <app> to <volume>%"
+  exit 1
+}
+
+function set-app-volume() {
+  player="$1"
+  volume="$2"
+  # get specific app sink
+  firstPlayerSinkIndex="$(pacmd list-sink-inputs | awk '/index:|application.name |application.process.binary / {print $0}' | sed 's/^ *//g ; s/.*= //' | grep -iB 1 "${player}" | awk '/index:/ {print $2; exit}')"
+  # I don't see the need to do this calculation here if pactl takes percentages direct anyway...
+  # 100% → 65536
+  #[[ $firstPlayerSinkIndex ]] && pacmd set-sink-input-volume "$firstPlayerSinkIndex" "$((volume*65536/100))"
+  [[ $firstPlayerSinkIndex ]] && pactl set-sink-input-volume "$firstPlayerSinkIndex" "${volume}%"
+}
+
+function list-app-sinks() {
+  pacmd list-sink-inputs | awk '/index:|volume: |application.name |application.process.binary / {print $0}' | sed 's/^[ \t]*//g'
+}
+
+case "$1" in
+  list)
+    list-app-sinks
+  ;;
+  set)
+    #if arguments < 3 show usage
+    if [ $# -ne 3 ]
+    then
+      usage
+    fi
+    set-app-volume $2 $3
+  ;;
+  *)
+    usage
+  ;;
+esac
+
+(${DEBUG}) && set +x
+
+exit 0