Play Sound script for raspberry pi connected to XiaoMi bluetooth Echo (using a2dp with pulseaudio)

playsound.sh

#!/bin/bash

# Usage:
# bash playsound.sh <AUDIO-FILE>

BLUEZ_MAC='74:A3:4A:0F:AB:D3'

get_a2dp_sink_index(){
	index=$(pactl list sinks short | grep ${BLUEZ_MAC//:/_}.a2dp_sink | awk '{print $1}')
	echo $index
}

get_bluez_sink_index() {
	index=$(pactl list sinks short | grep bluez_sink.${BLUEZ_MAC//:/_} | awk '{print $1}')
	echo $index
}

get_bluez_card_index() {
	index=$(pactl list cards short | grep bluez_card.${BLUEZ_MAC//:/_} | awk '{print $1}')
	echo $index
}

count_down_bluez_ready(){
	for ((q=10;q>0;q--)); do
		echo "Counting down ... :$q"
		echo "Retry connecting to bluetooth device ${BLUEZ_MAC}"
		echo -e "power on\nconnect ${BLUEZ_MAC}\nquit" | bluetoothctl

		if ! [[ -z $(get_bluez_card_index) ]]; then
			echo "bluez card is ready"
			break	
		fi
		sleep 5
	done
}

setup_bluez_sink(){
	sudo service bluetooth start
	echo -e "power on\nconnect ${BLUEZ_MAC}\nquit" | bluetoothctl

	# use a loop to count and check bluez ready
	count_down_bluez_ready

	local card_index=$(get_bluez_card_index)
	pactl set-card-profile ${card_index} a2dp_sink

	echo "setup bluez sink, index is: $(get_bluez_sink_index)"
}

switch_to_a2dp() {
	echo "switch to a2dp"
	
	local card_index=$(get_bluez_card_index)
	pactl set-card-profile ${card_index} a2dp_sink
}

play_sound(){
	echo "Playing sound: $@"
	paplay -d bluez_sink.${BLUEZ_MAC//:/_}.a2dp_sink "$@"
}

main() {
	# check bluez sink ready
	# if not ready
	if [[ -z $(get_bluez_sink_index) ]]; then
		setup_bluez_sink
	elif [[ -z $(get_a2dp_sink_index) ]]; then
		switch_to_a2dp
	fi

	play_sound "$@"
}

main "$@"