[PD] Audio properties dialog

[Ivica Ico Bukvic]

Cool, thanks!

On 10/7/2014 7:47 PM, Miller Puckette wrote:
> It could easily be that it mattered in the past and/or matters on some part-
> icular hardware (I spent years fidding with ALSA trying to find magic to get
> its latency down on various devices).
>
> cheers
> M
>
> On Tue, Oct 07, 2014 at 07:41:20PM -0400, Ivica Bukvic wrote:
>> 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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>>>>
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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