[AudioUnit] Make P/Invokes in AudioComponent.cs have blittable signatures. (#20146)

Contributes towards #15684.

src/AudioUnit/AudioComponent.cs

@@ -32,6 +32,7 @@
 using System;
 using System.Collections.Generic;
 using System.Text;
+using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 using ObjCRuntime;
 using AudioToolbox;
@@ -261,7 +262,9 @@ namespace AudioUnit {
 		public static AudioComponent? FindNextComponent (AudioComponent? cmp, ref AudioComponentDescription cd)
 		{
 			var handle = cmp.GetHandle ();
-			handle = AudioComponentFindNext (handle, ref cd);
+			unsafe {
+				handle = AudioComponentFindNext (handle, (AudioComponentDescription*) Unsafe.AsPointer<AudioComponentDescription> (ref cd));
+			}
 			return (handle != IntPtr.Zero) ? new AudioComponent (handle, false) : null;
 		}
 
@@ -313,38 +316,47 @@ namespace AudioUnit {
 		}
 
 		[DllImport (Constants.AudioUnitLibrary)]
-		static extern IntPtr AudioComponentFindNext (IntPtr inComponent, ref AudioComponentDescription inDesc);
+		unsafe static extern IntPtr AudioComponentFindNext (IntPtr inComponent, AudioComponentDescription* inDesc);
 
 		[DllImport (Constants.AudioUnitLibrary, EntryPoint = "AudioComponentCopyName")]
-		static extern int /* OSStatus */ AudioComponentCopyName (IntPtr component, out IntPtr cfstr);
+		unsafe static extern int /* OSStatus */ AudioComponentCopyName (IntPtr component, IntPtr* cfstr);
 
 		public string? Name {
 			get {
-				if (AudioComponentCopyName (Handle, out var r) == 0)
+				IntPtr r;
-					return CFString.FromHandle (r);
+				unsafe {
+					if (AudioComponentCopyName (Handle, &r) == 0)
+						return CFString.FromHandle (r);
+				}
 				return null;
 			}
 		}
 
 		[DllImport (Constants.AudioUnitLibrary)]
-		static extern int /* OSStatus */ AudioComponentGetDescription (IntPtr component, out AudioComponentDescription desc);
+		unsafe static extern int /* OSStatus */ AudioComponentGetDescription (IntPtr component, AudioComponentDescription* desc);
 
 		public AudioComponentDescription? Description {
 			get {
-				if (AudioComponentGetDescription (Handle, out var desc) == 0)
+				AudioComponentDescription desc;
-					return desc;
+				unsafe {
+					if (AudioComponentGetDescription (Handle, &desc) == 0)
+						return desc;
+				}
 
 				return null;
 			}
 		}
 
 		[DllImport (Constants.AudioUnitLibrary)]
-		static extern int /* OSStatus */ AudioComponentGetVersion (IntPtr component, out int /* UInt32* */ version);
+		unsafe static extern int /* OSStatus */ AudioComponentGetVersion (IntPtr component, int* /* UInt32* */ version);
 
 		public Version? Version {
 			get {
-				if (AudioComponentGetVersion (Handle, out var ret) == 0)
+				int ret;
-					return new Version (ret >> 16, (ret >> 8) & 0xff, ret & 0xff);
+				unsafe {
+					if (AudioComponentGetVersion (Handle, &ret) == 0)
+						return new Version (ret >> 16, (ret >> 8) & 0xff, ret & 0xff);
+				}
 
 				return null;
 			}
@@ -495,7 +507,7 @@ namespace AudioUnit {
 		[iOS (16,0)]
 #endif
 		[DllImport (Constants.AudioUnitLibrary)]
-		static extern int AudioComponentCopyConfigurationInfo (IntPtr /* AudioComponent */ inComponent, out /* CFDictionaryRef** */ IntPtr outConfigurationInfo);
+		unsafe static extern int AudioComponentCopyConfigurationInfo (IntPtr /* AudioComponent */ inComponent, /* CFDictionaryRef** */ IntPtr* outConfigurationInfo);
 
 #if NET
 		[SupportedOSPlatform ("macos13.0")]
@@ -509,7 +521,10 @@ namespace AudioUnit {
 		[iOS (16,0)]
 #endif
 		public NSDictionary? GetConfigurationInfo (out int resultCode) {
-			resultCode = AudioComponentCopyConfigurationInfo (GetCheckedHandle (), out var dictPtr);
+			IntPtr dictPtr;
+			unsafe {
+				resultCode = AudioComponentCopyConfigurationInfo (GetCheckedHandle (), &dictPtr);
+			}
 			if (resultCode == 0) {
 				return Runtime.GetNSObject<NSDictionary> (dictPtr, owns: true);
 			}
@@ -542,8 +557,8 @@ namespace AudioUnit {
 		[MacCatalyst (16,0)]
 #endif
 		[DllImport (Constants.AudioUnitLibrary)]
-		static extern int AudioComponentValidate (IntPtr /* AudioComponent* */ inComponent, IntPtr /* CFDictionaryRef* */ inValidationParameters,
+		unsafe static extern int AudioComponentValidate (IntPtr /* AudioComponent* */ inComponent, IntPtr /* CFDictionaryRef* */ inValidationParameters,
-				out AudioComponentValidationResult outValidationResult);
+				AudioComponentValidationResult* outValidationResult);
 
 #if NET
 		[SupportedOSPlatform ("macos13.0")]
@@ -558,7 +573,10 @@ namespace AudioUnit {
 		[MacCatalyst (16,0)]
 #endif
 		public AudioComponentValidationResult Validate (NSDictionary? validationParameters, out int resultCode) {
-			resultCode = AudioComponentValidate (GetCheckedHandle (), validationParameters.GetHandle (), out var result);
+			AudioComponentValidationResult result;
+			unsafe {
+				resultCode = AudioComponentValidate (GetCheckedHandle (), validationParameters.GetHandle (), &result);
+			}
 			if (resultCode == 0)
 				return result;
 			return AudioComponentValidationResult.Unknown;

tests/cecil-tests/BlittablePInvokes.KnownFailures.cs

@@ -369,11 +369,6 @@ namespace Cecil.Tests {
 			"System.Boolean SystemConfiguration.NetworkReachability::SCNetworkReachabilitySetDispatchQueue(System.IntPtr,System.IntPtr)",
 			"System.Byte Security.SecProtocolMetadata::sec_protocol_metadata_access_supported_signature_algorithms(System.IntPtr,ObjCRuntime.BlockLiteral*)",
 			"System.Byte* Network.NWEndpoint::nw_endpoint_get_signature(System.IntPtr,System.UIntPtr&)",
-			"System.Int32 AudioUnit.AudioComponent::AudioComponentCopyConfigurationInfo(System.IntPtr,System.IntPtr&)",
-			"System.Int32 AudioUnit.AudioComponent::AudioComponentCopyName(System.IntPtr,System.IntPtr&)",
-			"System.Int32 AudioUnit.AudioComponent::AudioComponentGetDescription(System.IntPtr,AudioUnit.AudioComponentDescription&)",
-			"System.Int32 AudioUnit.AudioComponent::AudioComponentGetVersion(System.IntPtr,System.Int32&)",
-			"System.Int32 AudioUnit.AudioComponent::AudioComponentValidate(System.IntPtr,System.IntPtr,AudioUnit.AudioComponentValidationResult&)",
 			"System.Int32 AudioUnit.AudioUnit::AudioObjectGetPropertyData(System.UInt32,AudioUnit.AudioObjectPropertyAddress&,System.UInt32&,System.IntPtr&,System.UInt32&,System.UInt32&)",
 			"System.Int32 AudioUnit.AudioUnit::AudioUnitGetProperty(System.IntPtr,AudioUnit.AudioUnitPropertyIDType,AudioUnit.AudioUnitScopeType,System.UInt32,System.UInt32&,System.UInt32&)",
 			"System.Int32 AudioUnit.AudioUnit::AudioUnitSetProperty(System.IntPtr,AudioUnit.AudioUnitPropertyIDType,AudioUnit.AudioUnitScopeType,System.UInt32,AudioToolbox.AudioStreamBasicDescription&,System.UInt32)",
@@ -394,7 +389,6 @@ namespace Cecil.Tests {
 			"System.Int32 Security.SslContext::SSLCopyALPNProtocols(System.IntPtr,System.IntPtr&)",
 			"System.Int32 Security.SslContext::SSLSetSessionTicketsEnabled(System.IntPtr,System.Boolean)",
 			"System.Int32 SystemConfiguration.NetworkReachability::SCNetworkReachabilityGetFlags(System.IntPtr,SystemConfiguration.NetworkReachabilityFlags&)",
-			"System.IntPtr AudioUnit.AudioComponent::AudioComponentFindNext(System.IntPtr,AudioUnit.AudioComponentDescription&)",
 			"System.IntPtr CoreGraphics.CGEvent::CGEventCreateKeyboardEvent(System.IntPtr,System.UInt16,System.Boolean)",
 			"System.IntPtr CoreGraphics.CGFunction::CGFunctionCreate(System.IntPtr,System.IntPtr,System.Runtime.InteropServices.NFloat*,System.IntPtr,System.Runtime.InteropServices.NFloat*,CoreGraphics.CGFunction/CGFunctionCallbacks&)",
 			"System.IntPtr CoreGraphics.CGImage::CGImageCreate(System.IntPtr,System.IntPtr,System.IntPtr,System.IntPtr,System.IntPtr,System.IntPtr,CoreGraphics.CGBitmapFlags,System.IntPtr,System.Runtime.InteropServices.NFloat*,System.Boolean,CoreGraphics.CGColorRenderingIntent)",