[Bluez-devel] questions about BT audio headset support...

[Lars Grunewaldt <lgw@dark-reality.de>]

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Hi there,

I decided to invest some of my precious time into improving audio
support for BT headsets; I'm going to take over maintenance of the
snd-bt-sco project.

I already did some minor improvements, but I don't know how to address
some critical design issues.

Right now, the way it works is this:
there's a user space program that handles the rfcomm and sco connection
(my enhanced version listens on open rfcomm for a connection request by
the headset, and opens the sco channel on demand), and an alsa audio
device driver. The device driver polls audio data to and from the
headset; the connection is managed by the user-space program.

Of course this is possibly not the best way of implementing things, but
I'm a bit stuck here.

The nicest way of implementing a better audio support would be having a
daemon that
a) listens for an incoming rfcomm connection that is open by the headset
itself
b) waits for a connection attempt (say, alsa audio interface opened) and
initiate such a connection
c) has the (optional) possibilty of keeping an open rfcomm session.
Reason for this one is the not-so-short rfcomm handshake time. The
rfcomm channel does not drain to much power from the headset, so it
might be a good idea to keep a steady connection at least as an option.

I don't have any clues how to implement this; what do you experts mean?
Should I try to enhance sco support itself, or should this stuff
(connection handling) be done in user-space? What is the easiest way to
recognize incoming rfcomm connections (listener on hci devices or
something?)

I'm really new to bluetooth, but I think I can adopt. I already worked
on some audio drivers and porting from 2.4 to 2.6 kernel, so I'm not a
total newbie, at least, I hope so :)

thanks for spending your time & any suggestions,
~  Lars
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