Re: [Bluez-devel] snd-bt-sco development teamup...

[Marcel Holtmann <marcel@holtmann.org>]

Hi Jonathan,

> > the point is that dropping packets and generating zero packets is
> > already part of the Bluetooth chip. This means we will get a correct
> > stream from the hardware and we must only make sure that we deliver our
> > packets in time as long as the hardware is able to buffer it.
> 
> Agreed. The problem I've seen is due to the driver not providing packets 
> in time to the SCO layer. As such, the hardware doesn't get a chance to 
> buffer.

there is also a flow control for SCO packets if my memory don't play
tricks with me. However I think that we should not worry about this too
much at the moment. If we ran into problems then we can think about how
we can fix them.

> > I prefer the ALSA integration would be written from scratch, because the
> > original driver was written for a 2.4 kernel and we must concentrate on
> > the 2.6 series. The ALSA subsytem will be cleaned up in the next kernel
> > releases and the magic casting stuff they do is still wrong.
> 
> I haven't been keeping track of ALSA development recently. It sounds like 
> you're saying that the API is going to be changing enough that simple 
> modifications to the existing ALSA-interfacing code in snd-bt-sco will not 
> be enough to keep it up to date. Does this mean it would be worth putting 
> a hold on development of a properly-bluez-integrated driver until the ALSA 
> subsystem has stabilised?

I don't know how much of the API will be really changed, but actually
some parts can be done much easier. My point is that I get a clean
driver in the end. The focus is the ALSA of a recent 2.6.8 kernel or
later and nothing before. If we must change something in the ALSA
library or tools only for adding another driver, this is a sign that
something has designed in a wrong way.

Regards

Marcel




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