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@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 _______________________________________________ Pd-list@lists.iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
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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@vt.edu www.performingarts.vt.edu disis.music.vt.edu l2ork.music.vt.edu
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