Re: Input rendering
Re: Input rendering
- Subject: Re: Input rendering
- From: Jeff Moore <email@hidden>
- Date: Mon, 25 Oct 2010 11:15:37 -0700
On Oct 25, 2010, at 10:35 AM, Bill Farmer wrote:
Hi
I have ported a musical instrument tuner application from windows. I have two queries concerning audio units:
I have set up microphone input using the AUHal audio unit in accordance with Technical Note TN2091, which works fine. However I would like to increase the kAudioUnitProperty_MaximumFramesPerSlice from the default value. I have done this, using AudioUnitSetProperty(), but the AURenderCallback parameter inNumberFrames is always the default value. Is this the expected behaviour, or am I missing something?
In addition to increasing kAudioUnitProperty_MaximumFramesPerSlice, you also need to set kAudioDevicePropertyBufferFrameSize to tell the underlying AudioDevice what buffer size you would like to use. Note that you can set this directly on your instance of AUHAL, as AUHAL proxies the underlying device's properties.
I would like to set up a chain of audio units, an AUHal unit, a format converter, and a low pass filter. I have tried setting up a chain both using the audio unit api, and the AUGraph api. In both cases, I can't get the rendering callback to work. Again is this expected, or am I missing something?
You'll need to provide more detail before we can help with this.
--
Jeff Moore
Core Audio
Apple
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