I don't know about average, but I have heard "longest delay I use is maybe 30-60 seconds" a few times. The bass piece I presented at PdCon has up to 30 seconds of delay for a complex mensuration/transposition canon, and it would be very useful to be able to clear it for rehearsal purposes.
On Wed, Nov 23, 2016 at 12:35 PM, Jonathan Wilkes <[email protected]> wrote: > > In this case, I'd probably rather see a hybrid approach where a second > buffer is already waiting. Then you could give "clear 300", and it would > switch to the empty buffer immediately while guaranteeing that the other > one is clear in 300ms. But this is maybe too complicated for the user, and > uses too much memory? > > > > Matt, > In the user reports, what is the average size of the buffer? Are we > really talking about buffers greater than, say, 1000ms? > > This sounds like premature optimization to me. > > -Jonathan > > > On Tue, Nov 22, 2016 at 7:32 AM, Ivica Bukvic <[email protected]> wrote: > > For clear, I can imagine having a second empty memory buffer being created > while delay continues to use the populated one until the memory allocation > is complete. At that point a simple change in the pointer should suffice, > after which the old buffer gets trashed. This would break determinacy, so > perhaps a separate argument could be used to enable this option in which > case the object could get another outlet that sends a bang when the > procedure is complete. > Best, > -- > Ivica Ico Bukvic, D.M.A. > Associate Professor > Computer Music > ICAT Senior Fellow > Director -- DISIS, L2Ork > Virginia Tech > School of Performing Arts – 0141 > Blacksburg, VA 24061 > (540) 231-6139 > [email protected] > www.performingarts.vt.edu > disis.icat.vt.edu > l2ork.icat.vt.edu > ico.bukvic.net > > On Nov 22, 2016 00:07, "Matt Barber" <[email protected]> wrote: > > Hi list; thanks for a wonderful PdCon (to Stevens and NYU people > especially). > > I had a quick chat with Miller after the "future of Pd" discussion. I told > him there is one feature I've heard Pd users ask for many times: a "clear" > method for [delwrite~]. A [delwrite~] resize method is something I've heard > brought up a number of times as well, but I didn't mention it. > > Each of these has a runtime cost that could disrupt the realtime dsp > calculation. Clearing a [delwrite~] is a linear-time operation, and for > long delay lines it could cause audio dropouts; resizing is more > problematic because it's not clear what to do with samples already in the > delay line – probably it would need to be cleared as well, which would take > even more time (although there is already an indirect resize function when > sample rate is changed). > > On the other hand, Pd arrays can be resized and cleared (const 0) ad > libitum, which is more or less the same operation. We usually tell users > 'do this at your own risk when computing audio.' > > So what is the main difference? I think it's that [delwrite~] is a tilde > object that is supposed not to cause dropouts on its own. If clearing it > could cause a dropout, there are reasons for thinking of that as a bug > rather than simply a risk. > > Is there a compromise procedure? We could add an option to spread the > clearing out over time. For instance "clear 5000" would mean "clear the > delay line over the next 5000 ms." A second argument would let the user > choose whether to preferentially preserve the most recent samples or the > oldest samples. Given only a time argument, default would be to preserve > oldest samples (less work has to be done overall since the write pointer > would also be filling the line with zeroes). Without a time argument (i.e. > "clear" with no arguments), the default would be to clear it immediately > with the understanding that there could be a possible dropout. > > A broader topic for another time would be "what Pd operations are/should > be realtime, and which are best at load time?" > > Thoughts? > > Matt > > ______________________________ _________________ > [email protected] mailing list > UNSUBSCRIBE and account-management -> https://lists.puredata.info/li > stinfo/pd-list <https://lists.puredata.info/listinfo/pd-list> > > > > _______________________________________________ > [email protected] mailing list > UNSUBSCRIBE and account-management -> https://lists.puredata.info/ > listinfo/pd-list > > >
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