A2DP API for bluetooth?

Question

Hi,
I want to send a sound to a a BT module. This module is like a headset.
I searched everywhere for a BT example for WP8 but I can't find any help.
I have this code:
StreamSocket socket = new StreamSocket();
await socket.ConnectAsync(peer.HostName, "1");
Why "1"? In the sample, RFCOMM is selected. If I want A2DP, what should I write?
Another question is: is there an API for A2DP? The protocol is really hard to understand. And I don't know where to begin if I have to write all without any library... All with socket.OutputStream()?
Hope someone can help me with this problem.
Thank you!
Adriano

Answer 1

Thank you very much Mark,
I was afraid, that it was not possible.
WP8 has the A2DP and  AVRCP protocol, but developers have to write again the entire protocol that is already present in the system to communicate with BT speakers?
I want to send 2 audio streams to 2 BT-speakers at the same time. Do you think, is it possible with Windows Phone 8?
From your links, I saw that there is a way to send data to the device without RFCOMM.
Old code:
StreamSocket socket = new StreamSocket();
await socket.ConnectAsync(peer.HostName, "1");
New code:
StreamSocket socket = new StreamSocket();
await socket.ConnectAsync(peer.HostName, "{0000110D-0000-1000-8000-00805F9B34FB}");
DataWriter dataWriter = new DataWriter(socket.OutputStream);
DataReader dataReader = new DataReader(socket.InputStream);
AdvancedAudioDistributionService: GUID = {0000110D-0000-1000-8000-00805F9B34FB}
AudioSourceService: GUID = {0000110A-0000-1000-8000-00805F9B34FB}
HeadsetService: GUID = {00001108-0000-1000-8000-00805F9B34FB}
I will try with this.
Thank you again for the links. Once I got it, I will insert a little example on this topic. Maybe it can help someone.
Adriano