[pulseaudio-discuss] digital devices (spdif)

[Lennart Poettering]

On Sat, 03.01.09 12:10, Colin Guthrie (gmane at colin.guthr.ie) wrote:

> > is the same work-flow as on Windows). I read somewhere that a big 
> > showstopper for this is the detection of digital devices. Why not just 
> > adding a module parameter for that, because I guess that most users, 
> > including me, already have to add the digital output by hand, so e.g.: 
> > load-module module-alsa-sink device=iec958:0 capabilities=spdif,..
> > until hal/alsa gives some more information.
> 
> Well you clearly know the score and what needs doing to make it kinda 
> work! I think you make good points about being able to dynamically 
> reconfigure sinks etc with different options.
> 
> Lennart, do you have any plans in this area? I know that loading all the 
> sub-cards on a device can lock off the previous ones, but perhaps the 
> detection code can be tweaked to open+suspend, open+suspend each of them 
> so that they are nto all enabled at the same time. And perhaps some 
> auto-probing could then be done once all the devices are loaded to 
> detect whether the devices are mutually exclusive etc. Don't know if 
> this would be possible? If it is perhaps these mutually exclusive sinks 
> can be presented to the user as a single sink but with "sink options" of 
> some kind (e.g. 5.1 support, digial vs. analog vs. both, etc. etc.).
> 
> Is this totally unreasonable?

(A "suspend" of an ALSA device in PA is actually implemented by
closing it)

As pointed out I am planning to do autoprobing on startup about the
configurations available and how they are exclusive to each
other. It's ugly, but should be robust.

Lennart

-- 
Lennart Poettering                        Red Hat, Inc.
lennart [at] poettering [dot] net         ICQ# 11060553
http://0pointer.net/lennart/           GnuPG 0x1A015CC4