Multiple binding signature issues with AVAssetWriter related types

[jeremy-visionaid]

Apple platform

iOS, Mac Catalyst

Framework version

net8.0-, net9.0-

Affected platform version

.NET 8.0.403

Description

public AVAssetWriter(NSUrl outputUrl, string outputFileType, out NSError error);

Should be

public AVAssetWriter(NSUrl outputUrl, AVFileTypes outputFileType, out NSError error);

Or the enum's FieldAttribute value should be conventiently accessible as a string somewhere

Similarly,
AVAssetWriterInput exposes all the MediaTypes as a string instead of a AVMediaTypes enum and there appears to be no convenient alternative.

Steps to Reproduce

Can just look at the docs:

AVAssetWriter:

https://developer.apple.com/documentation/avfoundation/avassetwriter/1426663-assetwriterwithurl?language=objc

https://learn.microsoft.com/en-us/dotnet/api/avfoundation.avassetwriter.-ctor?view=xamarin-ios-sdk-12#avfoundation-avassetwriter-ctor(foundation-nsurl-system-string-foundation-nserror@)

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

AVAssetWriterInput:

https://developer.apple.com/documentation/avfoundation/avassetwriterinput/1385912-initwithmediatype?language=objc

https://learn.microsoft.com/en-us/dotnet/api/avfoundation.avassetwriterinput.-ctor?view=xamarin-ios-sdk-12#avfoundation-avassetwriterinput-ctor(system-string-avfoundation-audiosettings)

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

Did you find any workaround?

AVFileTypesExtensions.GetConstant()
AVFileTypesExtensions.GetValue()

Relevant log output

No response

[jeremy-visionaid]

@rolfbjarne I think this type of issue has come up before (i.e. mismatched strings/enums), and it probably isn't limited to these particular types, just these are the ones that have come up most recently.

Unfortunately, I also can't link to the current documentation due to dotnet/dotnet-api-docs#10178

[snechaev]

Or the enum's FieldAttribute value should be conventiently accessible as a string somewhere

Correct me if I'm wrong, but the AVFileTypesExtensions.GetConstant() extension method should do the trick, so the AVFileTypes.Aifc.GetConstant()=="public.aifc-audio"

And such an extensions (and the opposite ones like an AVFileTypesExtensions.GetValue(NSString) that can get the C# enum from the string value) exist for the many enums in the Xamarin that are bound to the native entities.

[rolfbjarne]

Or the enum's FieldAttribute value should be conventiently accessible as a string somewhere

As @snechaev mentioned, the field value is accessible using the GetConstant extension method on the enum value:

var str = AVFileTypes.Aifc.GetConstant ();

We should still add the overloads that take the enum though, so keeping this open.

[jeremy-visionaid]

@tolszak:

Or the enum's FieldAttribute value should be conventiently accessible as a string somewhere

Correct me if I'm wrong, but the AVFileTypesExtensions.GetConstant() extension method should do the trick, so the AVFileTypes.Aifc.GetConstant()=="public.aifc-audio"

And such an extensions (and the opposite ones like an AVFileTypesExtensions.GetValue(NSString) that can get the C# enum from the string value) exist for the many enums in the Xamarin that are bound to the native entities.