Very short junk audio signal on 10.5 x86
Very short junk audio signal on 10.5 x86
- Subject: Very short junk audio signal on 10.5 x86
- From: "Andreas Falkenhahn" <email@hidden>
- Date: Sat, 29 Aug 2009 21:57:18 +0200
Hi,
I've noticed that on an Intel iMac with OS 10.5 my app suddenly has a very
brief junk audio signal whenever a sound has finished playing. Under Tiger
on my PPC Mac mini, this doesn't happen though.
Here's my setup:
Whenever a sound is played, I'm starting a new channel on my Audio Mixer
Unit using kAudioUnitProperty_SetRenderCallback. In the render callback,
I'm calling AudioConverterFillComplexBuffer(). When there's no more data
left to play, I let my ACComplexInputProc() return NULL for everything and
set a flag that indicates that this channel has finished playing.
This flag is then catched by my notification callback that I installed using
AudioUnitAddRenderNotify(). On every kAudioUnitRenderAction_PostRender
event, the notification proc will check if the "channel_finished" flag is set
and if it is set, it will stop the render callback on the respective channel by
calling kAudioUnitProperty_SetRenderCallback with NULL.
And this is the exact point where the very brief junk noise occurs. When
my notification proc stops the render callback on the respective channel,
I get a brief junk audio signal. It's just a fragment of a second in time, but
clearly audible and annoying. So I'm wondering what can I do about this?
As I said, it doesn't happen under Tiger on PPC, but under Leopard on x86
it's there and really annoying.
What can I do to fix this?
Tks
Andreas
--
"Remember: It's nice to be important but it's more important to be nice!"
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