Re: Audio Unit synth how-to
Re: Audio Unit synth how-to
- Subject: Re: Audio Unit synth how-to
- From: William Stewart <email@hidden>
- Date: Tue, 10 May 2005 11:09:19 -0700
You have to understand that the host basically controls your
behaviour. It calls Render, not you. The host may "take you offline"
in this case - ie. not call your Render call, or it may not - and
just pump silence through. You don't know (nor do you care) _ you
just have to respond to what the host asks you to do.
Have a look through the documentation we do have:
/Developer/Examples/CoreAudio/Documentation
There's some comments there about the general rendering process from
the host's perspective, and how AudioUnitReset ties into that process
as well.
Never mind, I found the answer - set the
kAudioUnitRenderAction_OutputIsSilence flag.
Not really. You set this flag ***whenever*** you are returning a
buffer that is completely silent.
This need have nothing to do with whether the user has "hit the stop
button" or not. For instance, a synth maybe silent for a large part
of a song because there's no notes being played by it - but the song
is still playing.
Bill
On 10/05/2005, at 9:47 AM, h wrote:
Here's an easy one: Once the user has hit the stop button, how do I
signal to the audio unit host to stop calling my Render() function?
If this is all documented somewhere, please let me know.
Cheers,
Hamish
--- James McCartney <email@hidden> wrote:
On May 8, 2005, at 2:59 PM, h wrote:
I just want to check - given that I have to call GetParameter()
during
Render() - I take it that if the parameter cannot change partway
through my Render() call? (Or else some kind of mutex would be
needed)?
Since setting a 32 bit word (e.g. a 32 bit float) is atomic, no mutex
is needed.
The value of GetParameter could change midway. It isn't likely to
change on a single processor because of the priority of the render
thread, but it may happen on a dual processor.
--- james mccartney --- apple coreaudio
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