> On Apr 6, 2016, at 4:31 PM, Jordan Johnson <j...@fellowhuman.com> wrote: > > On Apr 6, 2016, at 15:18, John Clements <cleme...@brinckerhoff.org> wrote: >> 1) The “stop” procedure is a giant end-of-the-world hammer; I wouldn’t >> expect it to be useful while a program is running. > > OK. It had that feel. > >> 2) I hesitate to suggest this, but there is a “pstream-set-volume!” function >> that can silence a pstream. (that was the caveat.) > > I think this points to a hackish solution that’ll work for us for now: > https://gist.github.com/RenaissanceBug/da7027d8c55a1819f9bae274e189ccac > The only concern I have thought of so far is whether this’ll cause memory > leakage over the course of a number of switches between pstreams; I don’t > know if there’s anything that will keep the GC from cleaning up the pstream > when it becomes unreachable.
Yes, I would expect it to be a problem. I wouldn’t worry so much about memory leakage as I would about the sound system gradually grinding to a halt. An ongoing pstream will continue to generate data, and sequencer.rkt will continue to compute it, multiply it all by zero, and then add it to the out-going stream. > >> 3) You are also correct in your supposition that the interface I proposed is >> not implemented. It looks like it could be done quickly, meaning probably on >> the order of 10-20 hours of work for me. > > I’m glad I asked rather than just dive in trying to figure it out in the > middle of a busy semester. > >> The relevant code to look at here would probably be >> https://github.com/jbclements/RSound/blob/master/rsound/sequencer.rkt >> [...] >> Adding the stop-playing! call would probably involve adding some king of >> message queue to the sequencer to receive fade-out messages, and updating >> the ‘entry’ structure to contain information about sounds that are currently >> fading in or out. > > I’ll look into it at some point, time permitting. But I think the gist above > will obviate my need for it, at least for the time being. Let me know how it goes. Best, John Clements -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
