Ensures bluetooth audio device is connected and using a2dp

headset.sh

#!/bin/bash

# headset.sh
# Created; April 2018
# Author; George Lester

# Under Mint Linux 17 and 18, on multiple devices, I consistently found that
# my bluetooth headset wouldn't reliably use a2dp, instead favoring the phone profile,
# and would completely refuse to switch to a2dp.

# This replicates the actions i would take every morning to fix the problem in the UI;

# 1. Restart bluetooth
# 2. Connect to the device
# 3. try to set a2dp
# if it fails, go back and do it again

# I don't know why i have to do this, but i do, so here we are.

#
MAC=$1
IDPA=$(echo "${MAC}" | sed -e 's/:/_/g')
CARD="bluez_card.${IDPA}"
SINK="bluez_sink.${IDPA}"

$(pactl list | grep -qi 'Active Profile: a2dp_sink')
a2dpUsed=$?

# may need to restart bluetooth multiple times to "unstick" it. Not sure why.
# this loops until a2dp is _actually used_ on the given MAC.
while [ ${a2dpUsed} -ne 0 ];
do
    #
    echo "Restarting bluetooth."
    rfkill unblock bluetooth
    sudo service bluetooth restart

    # reconnect
    echo -e "power on\nconnect ${MAC}" | bluetoothctl

    #
    echo "Waiting for headset to be connected..."
    btConnected=1

    while [ ${btConnected} -gt 0 ];
    do
	sudo hciconfig hci0 down
	sudo hciconfig hci0 up
	echo -e "connect ${MAC}" | bluetoothctl

        sleep 4
        $(bluetoothctl <<< "info ${MAC}" | grep -qi "Connected: yes")
        btConnected=$?
    done

    #
    echo "Bluetooth connected, waiting for profiles to register"

    cardFound=1
    while [ ${cardFound} -ne 0 ];
    do
	sleep .1
	
        $(pactl list | grep -qi "${CARD}")
        cardFound=$?
    done

    #
    echo "Setting bluetooth a2dp profile"
    pactl set-card-profile ${CARD} a2dp_sink
    $(pactl list | grep -qi 'Active Profile: a2dp_sink')
    a2dpUsed=$?
done

echo "a2dp is working."

pacmd set-default-sink ${SINK}

inputs=($(pacmd list-sink-inputs | grep index | awk '{print $2}'))
for i in ${inputs[*]};
do
	pacmd move-sink-input ${i} ${SINK} &> /dev/null
done

echo "default device changed to a2dp device."