#!/bin/bash

 APPNAME="firefox"
 pactl list sink-inputs |
 while IFS= read -r line; do
    #echo ${line}
    echo $line | grep 'Sink Input'
    if [ $? -eq 0 ]; then
        LATESTID=$(echo $line | egrep -o '[0-9]{1,9}')
        echo $LATESTID
    else
        # Search for specified APPNAME in process.binary
        echo $line | grep 'application.process.binary = "$APPNAME"'
        if [ $? -eq 0 ]; then
            echo $APPNAME $LATESTID
            break
        fi
    fi
done