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" <[email protected]
<mailto:[email protected]>> 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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