On 05/02/2013 02:37 PM, Arun Raghavan wrote:
On Thu, 2013-05-02 at 12:55 +0200, David Henningsson wrote:
Just had an idea which I'll write down here before I forget it
again...and I'm not saying I'll implement this anytime soon either, but
here goes:
There is a device reserve protocol between PulseAudio and JACK2 - when
JACK needs the sound card, it'll send a dbus message to PulseAudio and
grab a name in D-Bus.
However, there are plenty of applications who like to access ALSA
directly, without going through JACK2 or PulseAudio. By making a
"reserve" plugin, we could have this functionality for those apps too.
In practice, if the app usually opens "plughw:0" or "hw:0", it could
instead open "reserve:plughw:0" or "reserve:hw:0" to also reserve the
device from PulseAudio usage while the device is open. Meanwhile,
PulseAudio is free to use other audio devices (which is not the case
when using e g pasuspender).
How does that sound?
Might be neat to do have desktops set up to do this whenever an ALSA
device is opened (that is do it unconditionally when hw:X or plughw:X is
opened).
Including when PA opens it? :P
I would prefer to do it explicitly, due to the possible overhead of
talking to D-Bus.
One could possibly imagine it being done automatically with plughw, but
definitely not with hw only because that's meant to be as low as you can
possibly get.
--
David Henningsson, Canonical Ltd.
https://launchpad.net/~diwic
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