Script that monitors Spotify and mute the system volume when an ad is played.

spotify-monitor.sh

#!/bin/bash

# Problem: if there is an ad you will be muted, no matter of what. You need to
# stop this script to avoid that.
set -euo pipefail
IFS=$'\n\t'

source volume.sh

get_systray_title(){
    # get the systray icon's text.
    # echo `xprop -name "Spotify - Linux Preview" 2>&1 | grep "_NET_WM_ICON_NAME(UTF8_STRING) = " | cut -d\" -f2`
    echo `xprop -name "Spotify Free - Linux Preview" 2>&1 | grep "_NET_WM_ICON_NAME(UTF8_STRING) = " | cut -d\" -f2`
}

is_ad(){
    # TODO: maybe use 'Spotify -' as a prefix?
    # blacklisted prefixes:
    prefixes=(
        'Spotify - 20th Century Fox'
        'Spotify - Alcatel'
        'Spotify - AXE'
        'Spotify - Banco Supervielle'
        'Spotify - Beat Batten'
        'Spotify - Compumundo'
        'Spotify - Corona'
        'Spotify - Disney'
        'Spotify - Heineken'
        'Spotify - Movistar'
        'Spotify - Pedidos Ya'
        'Spotify - Personal'
        'Spotify - Quilmes'
        'Spotify - SUPERVIELLE'
        'Spotify - Sennheiser'
        'Spotify - Sin Control'
        'Spotify - Sony Music'
        'Spotify - Spotify'
        'Spotify - TNT'
        'Spotify - Tuenti'
        'Spotify - Universal Music'
        'Spotify - Verano 2015'
        'Spotify - Warner'
        'Spotify - Warner Music'
    )

    title=`get_systray_title`

    # check if it is a new ad and start with known prefixes
    for p in "${prefixes[@]}"; do
        if [[ $title = ${p}* ]]; then
            echo true
            return
        fi
    done
    echo false
}

# Define escape code and colors
esc=`echo -en "\033"`
CC_GREEN="${esc}[0;32m"
CC_RED="${esc}[0;31m"
CC_NORMAL="${esc}[m"

# we cycle indefinitely since Spotify seems to have removed all actions
# notifying that a song has changed
SINK=""
while true; do
    sleep 0.1

    if [[ `is_ad` == "true" ]]; then
        if [[ `volume_is_muted` != "yes" ]]; then
            [[ -n $SINK ]] && echo -n "Advertisement -> ${CC_RED}mute.${CC_NORMAL} waiting ad to finish... "
            volume_mute
        fi
        continue  # skip to the next iteration
    fi

    if [[ `volume_is_muted` == 'yes' ]]; then
        echo "${CC_GREEN}unmute.${CC_NORMAL}"
        volume_unmute
    fi
done

volume.sh

#!/bin/bash

_define_sink_to_use(){
    # NOTE: sometimes all sinks are 'suspended'...

    # this may return more than one sink to deal with
    # SINK=`pactl list short sinks | grep -E "RUNNING|IDLE|SUSPENDED" | cut -f1`
    # SINK_NAME=`pactl list short sinks | grep -E "RUNNING|IDLE|SUSPENDED" | cut -f2`

    SINK=`pactl list short sinks | grep -E "RUNNING|IDLE" | cut -f1`
    SINK_NAME=`pactl list short sinks | grep -E "RUNNING|IDLE" | cut -f2`
    if [[ -z $SINK ]]; then exit 1; fi;
}

volume_is_muted(){
    _define_sink_to_use
    # echo `pacmd dump | awk '
    #     $1 == "set-sink-mute" {m[$2] = $3}
    #     $1 == "set-default-sink" {s = $2}
    #     END {print m[s]}'`
    pacmd dump | grep -i set-sink-mute | grep $SINK_NAME | cut -f3 -d' '
}

volume_mute(){
    _define_sink_to_use
    # pactl set-sink-mute $SINK 1 > /dev/null 2>&1
    pactl set-sink-mute $SINK 1
}

volume_unmute(){
    _define_sink_to_use
    pactl set-sink-mute $SINK 0 > /dev/null 2>&1
}


volume_get(){
    _define_sink_to_use
    echo `pactl list sinks |
        grep -A5000 "Sink #$SINK" |
        grep -m1 "Volume" |
        grep -oE "[0-9]{2,3}%" |
        head -n1`
}

volume_set(){
    if [[ -z $1 ]]; then
        echo "Missing parameter, use '100%'."
        exit
    fi
    _define_sink_to_use

    # this looks like: pactl set-sink-volume 0 100%
    pactl set-sink-volume $SINK $1
}

help(){
    echo ">> Volume set/get helper for pulseaudio."
    echo "Sets/gets the system volume."
    echo
    echo "Usage: $0 (set xx% | get )"
    echo
    echo "     set : Sets the system volume to the given value. Note: it can be more than 100%."
    echo "     get : Gets the current system volume and echoes it to the screen."
    echo "    mute : Mute."
    echo "  unmute : Unmute, restore volume."
    echo " ismuted : Checks whether the volume is muted or not."
    echo "    help : Show this help"
    echo
}

# If the script is being sourced do not check for command/params
[[ "${BASH_SOURCE[0]}" != "${0}" ]] && return

case "$1" in
    get)
        volume_get
        ;;
    set)
        volume_set $2
        ;;
    ismuted)
        volume_is_muted
        ;;
    mute)
        volume_mute
        ;;
    unmute)
        volume_unmute
        ;;
    *)
        help
        ;;
esac