Re: Curious happening with CAPlayThough
Re: Curious happening with CAPlayThough
- Subject: Re: Curious happening with CAPlayThough
- From: Jeff Moore <email@hidden>
- Date: Wed, 07 Jan 2009 17:13:42 -0800
I believe that you are probably just hearing the results of either the
System Sound Server handles re-triggering a sound while the sound is
already playing. Or it's just some kind of playback bug in the SSS
(possibly one that's been around for a while but very hard to
reproduce normally).
At any rate, it seems unlikely to be a bug in CAPlayThrough though.
I'd verify this by making sure that just playing audio to this
pipeline with a tool like afplay never has any artifacts.
It is definitely worth writing this up as a bug for us to look at
though.
On Jan 7, 2009, at 4:19 PM, Neil Clayton wrote:
I'm seeing some odd behavior that I'd like to clarify please.
I install Soundflower 2ch, and playthru from that to the built in
line-output. I setup the SF2ch device to be the default output.
I then go to system preferences Sound page, and repeatedly click on
the "Ping" sound (to hear it).
What I hear is that sometimes, it's broken up. As though the last
part of the sample is played again briefly.
Curiously, if I play iTunes to the SF2ch (and through CAPlaythrough,
to the default output) it's absolutely fine.
I'm pretty sure it's not the SF driver itself (but not 100%, I've
not verified the code at all), because it works find if I use
GarageBand for the same task (the playthru part). It also works
fine with LineIn (a similar util, free, from Rogue Amoeba).
So my question is; is this something to do with the way that the AU
is setup? Or to do with flags passed in during the AudioUnitRender?
Or something else entirely?
--
Jeff Moore
Core Audio
Apple
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