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pa-suspend-v2.sh
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pa-suspend-v2.sh
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#!/bin/bash
###############################################################################
# Name:
# pa-suspend (PulseAudio Suspend)
#
# Puspose:
# Change the PulseAudio run command, to replace verbose logging with error only logging. Then restart PulseAudio.
# Load the PulseAudio "module-suspend-on-idle" module in the Home Assistant "hassio_audio" container.
# This is done either when the script is started and the container is already running, or when the container is (re)started.
# This is done to prevent audio issues and reduce CPU usage in certain environments, caused by system-wide PulseAudio running in the hassio_audio container.
#
# A new version of the PulseAudio container "2022.04.1" (PA version 14.2) was released recently, with (amongst others) the following changes:
# - the configuration file ("run") moved to a new location.
# - PulseAudio does not run in verbose mode anymore. Based on the (volume of) container logs there is no need to change the log level.
# The "suspend" module is not loaded by default though, and this is still required as the new version of the PulseAudio container otherwise still consumes high CPU.
#
# Description:
# - When
# a) the script starts, but the "hassio_audio" container is already running.
# b) the script is already running, and then the "hassio_audio" container is (re)started.
# - What
# 1) update the PulseAudio run parameters in /run/s6/services/pulseaudio/run
# replace "-vvv" (verbose logging) with "--log-level=0" (log errors only).
# 2) Stop PulseAudio. It will automatically be restared using the new parameters.
# 3) load the PulseAudio "module-suspend-on-idle" module inside "hassio_audio".
# Continue to monitor Docker Events for "hassio_audio" container start events.
# The script start- and module load events are reported to rsyslog as User events.
#
#
# Execution
# - Shell script: ./pa-suspend.sh
#
# Version
# v1.1 - Changed hassio_audio logging from verbose to error-only.
# v1.2 - Fixed bug in Docker exec commands, expanded error checking.
# v1.3 - Added boolean settings to enable/disable (1) change run params (2) load PA module, (3) set null devices as defaults (sink and input)
# v1.4 - Added boolean setting to disable bluetooth module
# v2.0 - Changes to support new PulseAudio container version "2022.04.1" (26-Nov-2022)
# - First check if the legacy "run" config file still in original folder. if yes then update.
# - More dynamic check to wait until container is ready, before loading suspend module.
#
###############################################################################
me=`basename "$0"`
RETVAL=0
DO_CHANGE_PARAMS=true
DO_LOAD_MODULE=true
DO_SET_NULL_AS_DEFAULT=true
DO_UNLOAD_BLUETOOTH_MODULE=true
pa_container="hassio_audio"
event_filter="container=hassio_audio"
event_format="Container={{.Actor.Attributes.name}} Status={{.Status}}"
legacy_config="/run/s6/services/pulseaudio/run"
#------------------------------------------------------------------------------
# Function to change parameters and load PulseAudio module
#------------------------------------------------------------------------------
function change_pulseaudio () {
set -x
if [[ $DO_CHANGE_PARAMS = true ]]; then
# Check if the legacy directory exists (still older version of container running).
res=$(docker exec -i hassio_audio [[ -f \$legacyconfig ]] 2>&1)
if [[ "${?}" -eq "0" ]]; then
# Change the PulseAudio run parameters: replace verbose logging with only logging errors. Then restart PulseAudio.
res=$(docker exec -i hassio_audio sed -i 's/-vvv/--log-level=0 --log-time=true/' \$legacyconfig 2>&1)
#res=$(docker exec -i hassio_audio bash -c "[[ -f \$legacyconfig ]] && sed -i 's/-vvv/--log-level=0 --log-time=true/' \$legacyconfig" 2>&1)
if [[ "${?}" -eq "0" ]]; then
# Restart PulseAudio (inside the container).
res=$(docker exec -i hassio_audio pkill pulseaudio 2>&1)
if [[ "${?}" -eq "0" ]]; then
sleep 1 # Wait for pulse audio to restart
else
logger -p user.err "${1}: Failed to kill PulseAudio in hassio_audio ($res)"
fi
else
logger -p user.err "${1}: Failed to change PA legacy parameters in hassio_audio ($res)"
fi
else
logger -p user.err "${1}: PulseAudio legacy run parameters not found / updated."
fi
fi
if [[ $DO_LOAD_MODULE = true ]]; then
# Load the PulseAudio suspend module. Retry 10 times, with increasing delay to allow container to settle down.
for i in {1..10};
do
res=$(docker exec -i hassio_audio pactl load-module module-suspend-on-idle 2>&1)
if [[ "${?}" == "0" ]]; then
logger -p user.err "${1}: PulseAudio module-suspend-on-idle loaded ok ($i)($res)"
break
else
sleep $i
fi
done
if [[ "${?}" -ne "0" ]]; then
logger -p user.err "${1}: PulseAudio module-suspend-on-idle failed to load! ($res)"
fi
else
logger -p user.err "${1}: Not loading PulseAudio module-suspend-on-idle."
fi
if [[ $DO_SET_NULL_AS_DEFAULT = true ]]; then
logger -p user.notice "${1}: PulseAudio setting default sink and source to null"
docker exec -i hassio_audio pactl unload-module module-switch-on-connect
docker exec -i hassio_audio pactl unload-module module-switch-on-port-available
docker exec -i hassio_audio pactl load-module module-null-sink
#docker exec -i hassio_audio pactl set-default-sink alsa_output.pci-0000_07_00.1.hdmi-stereo-extra2
docker exec -i hassio_audio pactl set-default-sink null
docker exec -i hassio_audio pactl set-default-source null.monitor
set +x
fi
if [[ $DO_UNLOAD_BLUETOOTH_MODULE = true ]]; then
set -x
logger -p user.notice "${1}: PulseAudio unloading bluetooth module"
docker exec -i hassio_audio pactl unload-module module-bluetooth-discover
set +x
fi
}
#------------------------------------------------------------------------------
# Function to listen forever and update container if hassio_audio is (re)started
#------------------------------------------------------------------------------
function event_loop () {
while read line; do
if [[ ${line} == *"Status=start" ]]; then
# Container started. Wait to allow container to initialize (else may get "connection refused" error).
sleep 5
# Call function to set the run parameters, and load the suspend module.
change_pulseaudio "${me} (Container Start)"
fi
done
}
#------------------------------------------------------------------------------
# Start of script
#------------------------------------------------------------------------------
logger -p user.err "${me}: Started"
# Check if hass_audio is already running, and it is already initialized.
tmp=$(docker exec hassio_audio date 2>&1)
if [[ "${?}" == "0" ]]; then
logger -p user.notice "${1}: $pa_container is already running when script was started. Loading module.."
change_pulseaudio "${me} (Script Start)"
else
logger -p user.warning "${me}: Script started - container hassio_audio not running."
fi
# Read the Container Events and pass to function loop to process.
docker events --filter ${event_filter} --format "${event_format}" | event_loop
exit $RETVAL