AddMutableTrack mediaType string value

Question

I'm using Swift AVFoundation in MAUI to perform audio file manipulation.

As part of that I need to use the AddMutableTrack method.

Swift's documentation says to use:

let compositionAudioTrack = composition.addMutableTrack(withMediaType: AVMediaType.audio, preferredTrackID: kCMPersistentTrackID_Invalid)

The C# MAUI code version of addMutableTrack accepts a string for the first parameter rather than an object:

var compositionAudioTrack = composition.AddMutableTrack("mediaType??", 0);

For Swift's AVMediaType.audio value, what is the equivalent C# MAUI value for this mediaType parameter in addMutableTrack?

For reference, composition is declared using:

var composition = new AVMutableComposition();

Answer 1

you should be using the objective-c documentation, as those are the interfaces that C# can call. C# does not support calling swift api's:

https://developer.apple.com/documentation/avfoundation/avmutablecomposition/1387601-addmutabletrackwithmediatype?language=objc

if you look at docs its just a typedef for NSString:

typedef NSString *AVMediaType;

and its values are all global constants defined in a module and exported via the .h file

AVMediaFormat.h

the c# wrapper is:

https://learn.microsoft.com/en-us/dotnet/api/avfoundation.avmediatype?view=xamarin-ios-sdk-12