Listen for sink changes on the default Pulseaudio server
Clone repository:
git clone https://github.com/Audio4Linux/PulseConnectionListener
cd PulseConnectionListener
Install dependencies (glibmm-2.4, giomm-2.4 and libpulse):
# Arch Linux
sudo pacman -S glibmm pulseaudioCompile project:
mkdir build && cd build
cmake ..
make
You should end up with a binary called pa_conn_watcher:
./pa_conn_watcher --help
Watch for pulseaudio sink changes
Usage:
./pa_conn_watcher [OPTION...]
-o, --once Wait for one event and exit
-r, --run arg Execute shell command on sink update
-f, --filter arg Filter by sink name
-c, --contains Filter modifier: don't require exact match
-s, --silent Disable output
-h, --help Print this message
First you need to find the name of the sink you want to watch:
pactl list sinks | grep "Name:" -A1
I'll use my Bluetooth earbuds (bluez_sink.80_7B_3E_21_79_EC.a2dp_sink) for the following examples. (You can also leave this filter out if you want to receive events from all sinks.)
Launch the pa_conn_watcher executable with the corresponding parameters:
./pa_conn_watcher --filter "bluez_sink.80_7B_3E_21_79_EC.a2dp_sink"
We can also run a shell command when an event has been received. For example, we can print something to stdout or run external scripts:
./pa_conn_watcher --run "echo 'Something happened!'" --silent --filter "bluez_sink.80_7B_3E_21_79_EC.a2dp_sink"
./pa_conn_watcher --run "viper restart" --once --filter "bluez_sink.80_7B_3E_21_79_EC.a2dp_sink"
NOTE: If you intend to use this program with Viper4Linux (viper restart), keep in mind that this causes an endless loop:
Watcher detects update -> restart viper -> restart causes sink update -> watcher detects update -> ...
To prevent this you can provide a --once flag and call the executable from a bash loop with sleep 5 appended to the command.
You can enable debug output using this environment variable:
export G_MESSAGES_DEBUG=all