Re: Starting

Thanks Joe, I really appreciate you taking the time to explain that. Makes
perfect sense. Thank you.

Ah, good idea regarding AudioBufferSourceNodes! Should've thought of that.

Thanks again,
Stuart


On 16 April 2013 00:32, Joseph Berkovitz <joe@noteflight.com> wrote:

> Hi Stuart,
>
> It isn't a silly question at all since it points at the need for clearer
> documentation in the future.
>
> The reason that ScriptProcessorNodes do not have start and stop times is
> that they act as processors of the raw sample blocks which serve as the
> basis for the AudioContext's operation. These blocks of necessity have a
> regular size and always begin/end at sample block boundaries. Adding
> scheduling to these nodes would make their operation more complicated to
> define and would mess with their "straight to the metal" simplicity.
>
> The scheduling of a GainNode's gain in front of your noise generator will
> work, but you could also do this within the ScriptProcessorNode although
> it's slightly more complicated. You can examine the playbackTime of each
> AudioProcessEvent, determine whether a start/stop occurs during the current
> sample block, and and begin/cease synthesis of a nonzero signal at the
> appropriate number of frames within the block.
>
> Perhaps an even simpler (and less performance intensive) way is to
> algorithmically pre-generate one or more reasonably long AudioBuffers of
> white noise and surface these as audio via one or more
> AudioBufferSourceNodes, which can be scheduled with start() and stop(). If
> you needed continuous white noise this wouldn't be so good, but since
> you're emulating drum sounds it may be a reasonable approach.
>
> .            .       .    .  . ...Joe
>
> *Joe Berkovitz*
> President
>
> *Noteflight LLC*
> Boston, Mass.
> phone: +1 978 314 6271
> www.noteflight.com
> "Your music, everywhere"
>
>
> On Apr 15, 2013, at 6:41 PM, Stuart Memo <stuartmemo@gmail.com> wrote:
>
> Hi all,
>
> I'm currently using a ScriptProcessorNode to generate white noise to
> emulate various drum sounds. My understanding from reading the spec is that
> there doesn't seem to be any way of scheduling a ScriptProcessorNode to
> start and stop it at desired times. The best solution to this problem I can
> think of is to schedule a gain node to mute/unmute at a certain time and
> then do my own garbage collection with setTimeout to disconnect the
> ScriptProcessorNode.
>
> This might be an edge case, and there's probably a very good reason that
> you shouldn't be able to start and stop a ScriptProcessorNode, but I
> thought I would flag it anyway. How about connectAtTime & disconnectAtTime
> as an alternative? Silly? Probably.
>
> - Stuart
>
>
>