安装蓝牙：
sudo pacman -S bluez bluez-utils
systemctl start bluetooth.service
systemctl enable bluetooth.service
安装蓝牙音频：
sudo pacman -S pulseaudio-bluetooth
sudo vim /etc/pulse/system.pa
/etc/pulse/system.pa 增加下面内容：
load-module module-bluetooth-policy
load-module module-bluetooth-discover
