Bluetooth Connector

bt_audio_attach

#!/bin/bash

function setDefaults {
    # The default rpi audio sink
    PA_SINK='alsa_output.platform-bcm2835_AUD0.0.analog-stereo'

    # Set a default source
    PA_SOURCE='none'
}

function getSource {
    # Get the first pulse audio bt source
    pactl list sources short | fgrep -m 1 bluez | awk '{print $2}'
}

function setVolume {
    # Set our volume to max
    pacmd set-sink-volume 0 65537
    amixer set Master 100%
}

function connect {
    # Always start afresh
    killall -9 pulseaudio

    # Connect source to sink
    pactl load-module module-loopback \
    source="$PA_SOURCE" sink="$PA_SINK" rate=44100 adjust_time=0
}

# Start at a known state
setDefaults

# Keep on checking for a change
while true; do

    # Get the bt sources
    _newSrc=$(getSource)

    # Did we get a bt source and is it new?
    if [ -z "$_newSrc" ] ; then
        # We don't have a source so set back to a known state
        setDefaults
    elif [ $_newSrc != $PA_SOURCE ] ; then
        # Great, lets connect the new bluetooth source.
        PA_SOURCE=$_newSrc
        connect
        setVolume
    fi

    sleep 5
done