[PD] Audio properties dialog

[Ivica Bukvic]

ALSA appears to have it but I notice no observable changes in perceived
latency.
On Oct 7, 2014 6:54 PM, "Miller Puckette" <msp at ucsd.edu> wrote:

> I couldn't immediately find anything short of going through each
> s_audio_*.c
> implementation and checking whether the "blocksize" parameter in the open
> routine gets used... ugh.
>
> M
>
> On Tue, Oct 07, 2014 at 09:14:43PM +0000, Jonathan Wilkes via Pd-list
> wrote:
> > Thanks.
> > Is there a quick way to figure out which APIs use it?
> > -Jonathan
> >
> >
> >      On Tuesday, October 7, 2014 5:07 PM, Miller Puckette <msp at ucsd.edu>
> wrote:
> >
> >
> >  Sorry - I had forgotten an important detail - not every API implements
> > blocksize.  In cases where either you can't or it would never help
> anything,
> > it's simply left at 64.  (and really, the control shouldn't appear on the
> > dialog when it isn't used :)
> >
> > I believe blocksize is most important in windows.
> >
> > cheers
> > Miller
> >
> > On Tue, Oct 07, 2014 at 02:15:09PM -0400, Ivica Ico Bukvic wrote:
> > > On 10/07/2014 01:41 PM, Miller Puckette wrote:
> > > >sys_blksize() reports the block size used by Pd's acheduler (I
> believe it's
> > > >always 64 in valnilla but will be settable someday :)
> > > >
> > > >the I/O blocksize, which is set in the audio settings dialog, is what
> > > >Pd uses to interface with whatever audio API is in use.
> > >
> > > Thanks for the clarification, Miller. What I am confused by is that
> when
> > > using ALSA and changing blocksize from 64 to 2048, there is no audible
> > > difference in the delay, even though it should be profound enough to be
> > > preceivable by ear. Is this because ALSA has another internal buffer
> that
> > > essentially supersedes either blocksize, making the final output
> (near?)
> > > identical?
> > >
> > > Also, response to Jonathan's follow-up question regarding JACK would be
> > > appreciated. It seems from looking at the code, JACK does not care
> about
> > > blocksize variable but I could be easily missing something.
> > >
> > > Best,
> > >
> > > Ico
> > >
> > > >
> > > >cheers
> > > >M
> > > >
> > > >On Tue, Oct 07, 2014 at 05:30:55PM +0000, Jonathan Wilkes via Pd-list
> wrote:
> > > >>Hi list,    What does the blocksize entry box in audio dialog
> properties do?  And how does that value relate (if at all) to the value
> output by sys_getblksize?
> > > >>Thanks,Jonathan
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> > >
> > > --
> > > Ivica Ico Bukvic, D.M.A.
> > > Associate Professor
> > > Computer Music
> > > ICAT Senior Fellow
> > > DISIS, L2Ork
> > > Virginia Tech
> > > School of Performing Arts - 0141
> > > Blacksburg, VA 24061
> > > (540) 231-6139
> > > ico at vt.edu
> > > www.performingarts.vt.edu
> > > disis.music.vt.edu
> > > l2ork.music.vt.edu
> > >
> > >
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