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In order to save audio with compression settings we need the ability to get the ChannelLayoutData from a CMAudioFormat object.
Ability to get NSData object of the CurrentChannelLayoutData. (currentChannelLayoutData = NSData.FromBytes(currentChannelLayout, currentChannelLayout.Size);
AudioChannelLayout currentChannelLayout = currentFormatDescription.AudioChannelLayout;
NSData currentChannelLayoutData = null;
// AVChannelLayoutKey must be specified, but if we don't know any better give an empty data and let AVAssetWriter decide.
if(currentChannelLayout != null)
currentChannelLayoutData = NSData.FromBytes(currentChannelLayout, currentChannelLayout); // Cannot current get a IntPtr to the Channel Layout
currentChannelLayoutData = new NSData();
NSDictionary audioCompressionSettings = NSDictionary.FromObjectsAndKeys (
currentChannelayoutData // Where ChannelLayoutData is required
AVAudioSettings.AVChannelLayout // Missing
I just added a method:
That will return the data in NSData form.