kAudioCodecPropertyAvailableOutputChannelLayouts

objc2_audio_toolbox

Constant kAudioCodecPropertyAvailableOutputChannelLayouts 

Source 
pub const kAudioCodecPropertyAvailableOutputChannelLayouts: AudioCodecPropertyID = kAudioCodecPropertyAvailableOutputChannelLayoutTags; // 1_634_689_900u32
Available on crate feature AudioCodec only.
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Apple’s documentation