nixos-config/nixos/assets/jack.sh

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#!/usr/bin/env bash
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set -e
defaultDevice=PCH
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start_jack() {
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internal_device_number=-1
komplete_device_number=$(aplay -l | grep Vestax | cut -d":" -f1 | cut -d" " -f2)
babyface_device_number=$(aplay -l | grep Babyface | cut -d":" -f1 | cut -d" " -f2)
cmedia_device_number=$(aplay -l | grep C-Media | cut -d":" -f1 | cut -d" " -f2)
h2n_device_number=$(aplay -l | grep H2n | cut -d":" -f1 | cut -d" " -f2)
# this should be more readable some day
if [[ $babyface_device_number == "" ]]; then
if [[ $komplete_device_number == "" ]]; then
if [[ $cmedia_device_number == "" ]]; then
if [[ $h2n_device_number == "" ]]; then
echo "use : default device"
device_number=$internal_device_number
else
echo "use : h2n"
device_number=$h2n_device_number
fi
else
echo "use : c-media"
device_number=$cmedia_device_number
fi
else
echo "use : komplete"
device_number=$komplete_device_number
fi
else
echo "use : babyface"
device_number=$babyface_device_number
fi
# device parameter configuration
# ==============================
#
# to find configuration options do
# jack_control dp
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if [[ $device_number -eq -1 ]]; then
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# we use alsa in reality, but pulse opens up all the pulse
# sink and source stuff
# jack_control ds pulse # not working for some reason
jack_control ds alsa
jack_control dps device hw:$defaultDevice
else
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jack_control ds alsa
jack_control dps device "hw:$device_number" # use usb card
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fi
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jack_control dps duplex True # record and playback ports
jack_control dps hwmon False # no hardware monitoring
jack_control dps rate 48000 # use cd sample rate
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# nperiods are the splitup of the
# sound-ring-buffer. 2 are ok for internal cards
# but for usb you should use 3 because
# you can have to write in junks to the card
# so there is one backup slice in the middle
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if [[ $internal_device_number -ne -1 ]]; then
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jack_control dps nperiods 3
fi
# engine parameter configuration
# ==============================
#
# to find configuration options do
# jack_control ep
jack_control eps sync True
# realtime kernel
# set True for using a realtime kernel
jack_control eps realtime False
# set priority if realtime kernel is set True
# jack_control eps realtime-priority 10
jack_control start
}
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stop_jack() {
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jack_control exit
}
status_jack() {
jack_control dp
jack_control ep
jack_control status
}
case $1 in
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start)
start_jack
;;
stop)
stop_jack
;;
restart)
stop_jack
start_jack
;;
*)
status_jack
;;
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esac