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channel layout for 3DMixer
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channel layout for 3DMixer


  • Subject: channel layout for 3DMixer
  • From: Antoine Gonot <email@hidden>
  • Date: Wed, 28 Oct 2009 13:27:21 +0100

Dear list,

When I set the number of channel for the 3DMixer output stream format, the channel layout tag is automaticaly set to the folowing :

numChannel = 5 -> kAudioChannelLayoutTag_AudioUnit_5_0
numChannel = 6 -> kAudioChannelLayoutTag_AudioUnit_6_0
numChannel = 7 -> kAudioChannelLayoutTag_AudioUnit_7_0
etc.

I would like to change this, in order to have a channel dedicated to the LFE (this is requiered by my 5.1 amplifier !). However, each time I try to change the channel layout tag, the AudioUnitSetProperty function return me an error, even if I respect the number of channel. For exemple, I tried to set the tag to kAudioChannelLayoutTag_AudioUnit_5_1 with 6 channels output stream format. Its seems that the 3DMixer does not allow to change speaker configuration. Is there any method to achieve this ?

best regards, 

Antoine Gonot

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