Re: [Bluez-devel] caching A2DP/alsa connection

[Brad Midgley <bmidgley@xmission.com>]

Andreas

I was thinking specifically about the stereo audio driver but it applies 
to handsfree/headsets.

> From what I have seen by a quick glance over the various soundservers,
> artsd seems to offer most oft the functionality I'd like to see.
> Especially it offers a remote control application (artsshell) that might
> be easily adapted to offer a few more commands (like changing output
> device).

I want to avoid a sound server that is tied to a specific desktop. What 
about alsa's dmix? it seems to do what we want and at a lower level 
where it would work for everyone... 
http://alsa.opensrc.org/index.php?page=DmixPlugin

> - let's discuss, what we'd like to see and how to accomplish it most
>   easily.
> - let's get in touch with the developers of the sound daemon that looks
>   like being easiest to adapt.
> - maybe we can get them to implement our suggestions, or we can help out
>   with that.

I like the thoughts you're having about this... here's what how I want 
it to behave:

- bluetooth audio connection is brought up on demand; best if control 
connection is brought up on demand too

- audio connection is held open for a slight delay after the device is 
closed or idle in case it's to be used again soon

- audio device can be used by multiple apps (writing) but just one app 
reading (in the case of sco)

- reading audio "from" the a2dp device can be redirected to another 
device like a hardwired mic

headset negotiation and avrcp (on newer a2dp sets) gets more complicated:

- generate dbus events for button presses on the headset
- accept dbus events to initiate headset "ring" function

I guess the next step is to find out if dmix is useful here.

Brad


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