[alsa-devel] [pulseaudio-discuss] idea: a reserve alsa plugin
david.henningsson at canonical.com
Thu May 2 15:23:59 CEST 2013
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
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
David Henningsson, Canonical Ltd.
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