Re: Audio levels, without using SequenceGrabber
Re: Audio levels, without using SequenceGrabber
- Subject: Re: Audio levels, without using SequenceGrabber
- From: Jeff Moore <email@hidden>
- Date: Tue, 27 Nov 2007 18:24:20 -0800
In that case, if you are using any of our mixer AUs, you can just use
the metering parameters those AUs already implement.
On Nov 27, 2007, at 6:21 PM, Neil Clayton wrote:
Thank you everyone for the replies. This was the kind of thing I
was after - sorry I wasn't clear enough in my description - I would
indeed need to monitor just outputs in an AU graph that I maintain,
so it's got nothing to do with attempting to monitor general system
output.
Thanks - I'll now go digging!
--
Regards,
Neil Clayton, http://shinywhitebox.com
On 28/11/2007, at 12:37 PM, Jeff Moore wrote:
There is no general direction I can point you at. Like I said,
there is no central point in a process where you can tap the mix.
The best you can do is deal with it on a case by case basis. For
example, our mixer AUs support metering via read-only parameters
like kMatrixMixerParam_PostAveragePower (for AUMatrixMixer). You
can use these properties in your engine to support metering.
But the same caveats I mentioned with QT apply here: this only
works for the cases you know about and have control over. Other
audio won't be included.
On Nov 27, 2007, at 3:28 PM, Neil Clayton wrote:
What would be the recommended way to monitor the current level of
an audio device?
I know if the SequenceGrabber method of doing this - but was
wondering about doing it purely in CoreAudio. I'm aware there is
no exposed API method to do it as standard, but wondered what the
general approach would be (so that I can go look in that direction).
--
Jeff Moore
Core Audio
Apple
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