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Re: Implementing Properties kAudioUnitProperty_SupportedChannelLayoutTags and kAudioUnitProperty_AudioChannelLayout
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Re: Implementing Properties kAudioUnitProperty_SupportedChannelLayoutTags and kAudioUnitProperty_AudioChannelLayout


  • Subject: Re: Implementing Properties kAudioUnitProperty_SupportedChannelLayoutTags and kAudioUnitProperty_AudioChannelLayout
  • From: William Stewart <email@hidden>
  • Date: Tue, 2 Sep 2008 18:32:08 -0700

Hi Motti

Can you try this in AULab (you can create a multichannel document there) - and see if you have the same result.

Also - have a look in auval - if you are publishing these properties correctly, you should see the layouts reported (Here's the AUMatrixReverb auval report for this section):
FORMAT TESTS:


Reported Channel Capabilities (explicit):
      [1, 2]  [1, 4]  [1, 5]  [2, 2]  [2, 4]  [2, 5]

Input/Output Channel Handling:
1-1 1-2 1-4 1-5 1-6 1-7 1-8 2-2 2-4 2-5 2-6 2-7 2-8 4-4 4-5 5-5 6-6 7-7 8-8
X X X X X X


# # AudioChannelLayouts (3), Output Scope:
ChannelLayout is Writable: F
The Unit publishes the following Channel Layouts:
  0x650002, 0x6C0004, 0x760005,

Is Audio Channel Layout Available:
Mono Stereo Binau. AU_4 Ambi. AU_5 AU_5_0 AU_6 AU_6_0 AU_7_0 AU_7_0F AU_8 AU_5_1 AU_6_1 AU_7_1 AU_7_1F
X X X


* * PASS

Bill

On Sep 1, 2008, at 5:44 AM, Motti Shneor wrote:

Hello all.

I'm trying to support the kAudioUnitProperty_SupportedChannelLayoutTags and kAudioUnitProperty_AudioChannelLayout Properties in my AudioUnit (subclass of AUMIDIEffectBase) to support surround channel layout routing in my AU.


When I try to debug through my component, I notice that neither kAudioUnitGetPropertyInfoSelect nor kAudioUnitGetPropertySelect are ever called with the above Property ID's.


LogicAudio is my Host application , running on MacOS X.4.11 using XCode 2.4.1. I can breakpoint within the component entry dispatcher, and I can hook on other properties without problem.

Am I missing something? Should I raise some flag, or somehow modify the 'thng' resource describing my AU, or somehow report that I support these properties to be asked for them?

Thanks for any hint!


Motti Shneor Senior Software Engineer Waves Audio Ltd www.waves.com



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References: 
 >Implementing Properties kAudioUnitProperty_SupportedChannelLayoutTags and kAudioUnitProperty_AudioChannelLayout (From: Motti Shneor <email@hidden>)

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