I've been playing with the 3D mixer using Tech Note 2112 (http://
developer.apple.com/technotes/tn2004/tn2112.html) as a guide. I can
get Azimuth, Distance and Elevation working ok, but I can't seem to
get internal reverb to work.
TN2112 says that I need to enable reverb for the whole mixer like this:
UInt32 reverbSetting = 1 // turn it on;
result = AudioUnitSetProperty(mMixerUnit,
kAudioUnitProperty_UsesInternalReverb,
kAudioUnitScope_Global,
0,
&reverbSetting,
sizeof(reverbSetting));
// get the current render flags for this bus
result = AudioUnitGetProperty (mMixerUnit,
kAudioUnitProperty_3DMixerRenderingFlags,
kAudioUnitScope_Input,
busIndex,
&render_flags_3d,
&outSize);
// turn on this render flag and then set the bus
render_flags_3d |= k3DMixerRenderingFlags_DistanceDiffusion;
result = AudioUnitSetProperty( mMixerUnit,
kAudioUnitProperty_3DMixerRenderingFlags,
kAudioUnitScope_Input, busIndex,
&render_flags_3d,
sizeof(render_flags_3d));
Unfortunately, it doesn't seem to make any difference I can hear to
the output. Has anyone else got this working? Is this effect too
subtle for my ears? Or have I missed something?
Thanks in advance
Bob
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