[PD] meaning of delay(msec) and use callbacks in audio settings

[Alexandre Torres Porres]

preferences, of course - I always wondered what makes it possible to get it
really low

2015-02-18 13:34 GMT-02:00 Jonathan Wilkes <jancsika at yahoo.com>:

> Are you saying you want to get the latency that you perceive down to
> 4/10ms?  Or do you just want to get the latency setting in the preferences
> down to 4/10ms?
>
> Unfortunately those are two very different things.
>
> -Jonathan
>
>
>   On Wednesday, February 18, 2015 10:11 AM, Alexandre Torres Porres <
> porres at gmail.com> wrote:
>
>
> >  I've seen really good setups get down to below 10ms (as low as 4)
>
> what kind of setup? :) it'd be cool if we described some rigs here
>
> cheers
>
> 2015-02-18 0:26 GMT-02:00 David Medine <dmedine at ucsd.edu>:
>
>  Basically these things have to do with performance.
>
> 'Use callbacks' has to do with how Pd communicates with your soundcard.
> There are two options, using callbacks, and blocking. In the callbacks
> scenario, your computer processes samples then asks the sound card to 'call
> you back' when it's ready to receive those samples (i.e. when it is out of
> audio to play and needs some more). In the meantime, you can process more
> samples, or check out what's going on on CNN.com or whatever.
>
> In the blocking method the computer hands the samples to the soundcard by
> calling a function and if the sound card is not ready, it 'blocks' meaning
> it stops your function in its tracks until it is ready to receive the data.
> Your thread (Pd) will halt until the function that sends the audio has
> finished.
>
> Anybody out there, please correct me if I am spreading misinformation
> here, but this is my understanding of this distinction.
>
> Delay(msec) is a delay between logical time (when your computer computes
> the audio) and real time (when the sound comes out the speaker). You want
> to have some head room here. I've seen really good setups get down to below
> 10ms (as low as 4) without any glitches, but usually you want much more
> time ~50ms or so.
>
>
> On 2/17/2015 5:42 PM, Jonghyun Kim wrote:
>
> Fyi, I use jack on Linux for PD.
> On Feb 18, 2015 8:16 AM, "Jonghyun Kim" <agitato816 at gmail.com> wrote:
>
> Hi list,
>
>  I would like to know about some features in audio settings.
>
>  I don't understand what mean these options.
>
>  *Delay(msec)* and *Use callbacks*
>
>  I googled these options, but still I don't understand. Is there some
> document about it?
>
>  Thanks in advance,
> akntk
>
>
>
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