Re: f13 pulse and passthrough

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On Wed, Oct 13, 2010 at 09:11:56AM +0100, Ian Malone wrote:
> On 12 October 2010 23:12, Paul W. Frields <stickster@xxxxxxxxx> wrote:
> > On Tue, Oct 12, 2010 at 10:09:55PM +0100, Ian Malone wrote:
> >> On 12 October 2010 16:02, Paul W. Frields <stickster@xxxxxxxxx> wrote:
> >> >
> 
> >> >
> >> > In PulseAudio, each sink has an associated "monitor" source that you
> >> > can use to monitor what's going out of that sink (such as listening to
> >> > a mixdown).
> >> >
> >>
> >> How do you actually listen to a monitor? The only way I've found so
> >> far is to use the loopback device which has a ~ 1/3 second latency.
> >
> > You can do this by running 'pamon' (from the pulseaudio-utils package)
> > and assigning the stream you create to some sink.  I just did it both
> > by 'folding back' onto the same output device and by assigning to a
> > new device.  In both cases latency was not apparent -- when I folded
> > back it sounded just like I increased the gain of the input stream.
> >
> 
> Thanks, I'm afraid I need a little more help. The best I've managed is running:
> pamon -r alsa_output.pci-0000_02_09.0.analog-surround-40.monitor
> and
> pamon -p alsa_output.pci-0000_02_09.0.analog-surround-40.monitor
> Which has a noticeable latency between the two. There's a delay
> corresponding to the difference in starting time, but even trying the
> latency and raw options I can't eliminate it. Is the difference
> possibly because I'm using a recording input as source? (To be sure
> we're on the same page I'm effectively trying to monitor line-in.)

Sorry for the delay Ian.  I'm using an ALSA back end here (which I
think is the default setup).  Is that what you're using?

Maybe I misunderstood -- I thought you were trying to monitor a
mixdown.  If you want to monitor a line-in, I think what you're
looking for is the 'combine' module, which allows you to create a
virtual sink that maps to any connected sinks.  That way you could
sink your line-in to wherever it normally would go, as well as a sink
for your listening device.


-- 
Paul W. Frields                                http://paul.frields.org/
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