[PD] Audio properties dialog

[Miller Puckette]

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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>    

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