Re: Jack and pulse on the Spin

Brendan Jones <brendan.jones.it@xxxxxxxxx> · Thu, 31 May 2012 16:10:28 +0200

On 05/31/2012 03:25 PM, David Sommerseth wrote:

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On 31/05/12 08:43, Brendan Jones wrote:

Just a note that the default F17 pulseaudio configuration supports
jack bridging via dbus (/etc/pulse/default.pa).

### Automatically connect sink and source if JACK server is
present .ifexists module-jackdbus-detect.so .nofail load-module
module-jackdbus-detect .fail .endif

This is different to again to
module-jack-sink.so/module-jack-source.so which is what some of us
have been using up until now.

What that means is if jack-audio-connection-kit-dbus is on the spin
by default, bridging is set up automatically.

This is something that needs to be considered carefully and I'd be
interested in how well jackdbus is working for people. I was
having random errors in the past with jackdbus hogging CPU with
pulse. I will perform some more monitoring here, but it would be
great to hear what others have experienced.

Throwing in a large torch at fire here now ... do we really need
pulseaudio?  I mean, this is a multi-media production spin, filled
with applications where Jack has become the standard - at least among
the audio based applications.

I don't know how that jack/pulse bridge really works ... but if pulse
really is needed, wouldn't it be better to write something which can
completely replace the pulse libraries, and rather re-use just the API
... so that pulse based applications appears as those in/out sinks in
Jack directly?  This might be a rather long-term goal though.

With pulseaudio-jack bridging, both are running. Pulseaudio simply 

redirects its output to jack's default system input ports.

This means applications which are not jack enabled will in most cases 

simply work. I regularly need to run applications for work (such as 

skype) and this seems to be a really stable solution.

Having said that, I'd really like one of the aims of the Spin be 

focussed on ease of configuration, and providing an easy way to disable 

pulseaudio completely should be considered.

This might be a better way to get better predictability in how the
audio production applications would behave, still having a fallback
for non-jack capable software.

Please educate me if I'm totally wrong here.

kind regards,

David Sommerseth
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