#!/bin/bash
# bash is required for the <<<

sinkdata=$(pacmd list-sinks)
listsink_rv=$?

if [ $listsink_rv -ne 0 ]
then notify-send "pulse plugins" "pulseaudio isn't running"
    exit
fi

if grep -q "<null>" <<< $sinkdata
then notify-send "pulse plugins" "already activated"
    exit
fi

# Add ladspa sinks
# LADSPA_PATH didn't work for me
pacmd load-module module-ladspa-sink sink_master=0 sink_name=lowfre_butt \
    plugin=/usr/local/lib/ladspa/butterworth_1902.so label=buttlow_iir control=50,
    #~ plugin=butterworth_1902 label=buttlow_iir control=50,
pacmd load-module module-ladspa-sink sink_master=0 sink_name=lowfre_tsche \
    plugin=/usr/local/lib/ladspa/lowpass_iir_1891.so label=lowpass_iir control=40,3
    #~ plugin=lowpass_iir_1891 label=lowpass_iir control=40,3

# Add null sink, loopback the ladspa sinks into it, set the null sink as default
# and adjust volume ratios
# code (modified) provided by georgC (via irc)
pacmd load-module module-null-sink
# adjust_time=0 avoids the latency offsets, however with this enabled, in time
# the overall latency grows bigger and bigger
# increasing latency_msec also didn't seem to fix the problem
pactl load-module module-loopback latency_msec=30 adjust_time=1 \
    source=null.monitor sink=lowfre_butt
pactl load-module module-loopback latency_msec=30 adjust_time=1 \
    source=null.monitor sink=lowfre_tsche
pactl load-module module-loopback latency_msec=30 adjust_time=1 \
    source=null.monitor sink=0
pacmd set-default-sink null
lowfre_index=$(pacmd list-sink-inputs | ag "<lowfre_butt>" -B4 | head -n1 | \
    cut -f2 -d":")
pacmd set-sink-input-volume $lowfre_index 0x10000
pacmd set-sink-input-volume $((lowfre_index+1)) 0x18675
#~ pacmd set-sink-input-volume $((lowfre_index+1)) 0x10000
pacmd set-sink-input-volume $((lowfre_index+2)) 0x7800
#~ pacmd set-sink-input-volume $((lowfre_index+1)) 0x7800

notify-send "pulse plugins" "activated"

# module-combine-sink also shows the latency offset problem(s)
# it also doesn't remember the volume configurations
# the problem also appears with two (instead of three) sinks