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Stream sound over bluetooth (A2DP) from your phone to a RaspberrryPi 3

I have a Google Chromecast integrated to my triple play box. I use Soundcloud as main music plateform, for a better sound experience. But using Soundcloud with a Google Chromecast is uncertain: with no real reason, few titles can't be listen.

That's why I decided to implement my own system.

How it works

I used:

The RaspberryPi 3 is plugged to the amplifier with an audio cable. I haven't tested yet the HDMI connectivity.

Inside the RaspberryPi 3, the bluetooth module will transmit audio to PulseAudio.


The RaspberryPi 3 is running with a Rasbpian Jessie distribution.

First, install dependencies (PulseAudio and bluetooth module):

sudo apt-get install pulseaudio bluez pulseaudio-module-bluetooth python-gobject python-gobject-2

In /etc/bluetooth/input.conf file, add Enable=Source,Sink,Media,Socket.

In /etc/pulse/daemon.conf file, add resample-method = trivial.

In /etc/bluetooth/main.conf file, add Class = 0x00041C.

And then, reboot.


Connect phone

Now, we have to pair and connect the phone. Activate bluetooth on it.

Go back to your RaspberryPi 3, launch sudo hciconfig hci0 piscan and pulseaudio -D, to start PulseAudio server.

Then, in bluetoothctl, launch those commands, with XX:XX:XX:XX:XX:XX the MAC address of your phone:

power on
agent on
scan on
connect XX:XX:XX:XX:XX:XX
scan off

Check a sound card named bluez_card.XX_XX_XX_XX_XX_XX is configured in pulseaudio with pactl list cards short.

Your phone must be connected to the RaspberryPi 3 with bluetooth. Check if everything is working, by playing a sound on your phone. The sound must be transfered to the RasbperryPi 3. If not, check if PulseAudio is launched.


But, the actual configuration doesn't allow to auto-connect the trusted phone. When bluetooth connection is stopped, you have to reconnect it in your RasbperryPi 3 with bluetoothctl.

It's because PulseAudio is not configured to be launched on start-up. To fix this, we have to start PulseAudio on start-up.

In /etc/dbus-1/system.d/pulseaudio-bluetooth.conf add this in busconfig section:

  <policy user="pulse">
    <allow send_destination="org.bluez"/>

To the end of /etc/pulse/ file, add:

### Automatically load driver modules for Bluetooth hardware
load-module module-bluetooth-policy

load-module module-bluetooth-discover

In /etc/pulse/client.conf, set autospawn to yes.

In /etc/pulse/daemon.conf, set allow-module-loading to yes.

Create /etc/systemd/system/pulseaudio.service file, with:

Description=Pulse Audio

ExecStart=/usr/bin/pulseaudio --system --disallow-exit --disable-shm --exit-idle-time=-1



systemctl daemon-reload
systemctl enable pulseaudio.service

The phone will be connected automatically to your RaspberryPi 3 bluetooth connection.

Next step

This solution is perfect to listen music when I'am alone. But my friends can't connect their phones without my help. Because I have to pair their phones with bluetoothctl (highly geeky, but not pragmatic).

My next step is to use a push button, like Amazon Dash, to allow phone pairing without doing anything.

I will update this blog post when this feature has been done.