[pulseaudio-discuss] Does pulseaudio resample when source and sink sample rate / bits are identical?

[Joshua Redstone]

Hi Colin,
Thanks, yeah 'pacmd list-sink-inputs' confirms that no resampling is
happening.
One other question:  I presume that a sink volume setting for of 100% means
no attentuation or amplification is happening, correct?
Thanks,
Josh

On Sat, Jul 16, 2011 at 2:43 PM, Colin Guthrie <gmane at colin.guthr.ie> wrote:

> 'Twas brillig, and Joshua Redstone at 16/07/11 21:35 did gyre and gimble:
> > Yeah, I'm using TCP because the source audio is generated on a different
> > machine from the one that has the USB sound card.
>
> OK, well I guess that explains that :D
>
> > I have a laptop with an internet music player on it, and I have a settop
> > PC (pretty wimpy)  that has a USB audio card connected to my stereo.
> > I run the music player on my laptop because I want to control the audio
> > from my laptop, and running the player on the settop and using vnc/nx is
> > way to slow.
>
> Yup that all makes sense :)
>
> > So maybe the pulseaudio isn't doing any resampling work and is just
> > churning to copy bytes around.  Is there any optimizations I should have
> > set up?  In my /etc/pulse/default.pa <http://default.pa> I have:
> >    load-module module-native-protocol-tcp
> > auth-ip-acl=127.0.0.1;192.168.0.0/16 port=8675
>
> Seems fine to me.
>
> > On the whole, I'm pretty happy with the setup.  I'm trying to become an
> > audio-snob :) and so wanted to make sure all my audio bits from the
> > music player were getting to the sound card
> > without unnecessary transformations.
>
> You can check with "pacmd list-sink-inputs" It should tell you the
> resample method chosen for any given input. There was a bug that
> prevented this from being cleared out so the info might be a bit bogus
> at times for some streams, but I don't think that problem will show up.
>
> It should say:
>
>        resample method: (null)
>
> Or similar if no resampling is being done.
>
> Col
>
> --
>
> Colin Guthrie
> gmane(at)colin.guthr.ie
> http://colin.guthr.ie/
>
> Day Job:
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>
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-- 
Josh
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