[ci skip] Add macOS native Audio Backend (ryubing/ryujinx!252)

See merge request ryubing/ryujinx!252

THIS IS CURRENTLY NOT EXPOSED BY THE UI OR HANDLED BY THE EMULATOR. Expect a commit later to add it to configs, UI, etc.

src/Ryujinx.Audio.Backends.Apple/Native/AudioToolbox.cs

@@ -0,0 +1,103 @@
+using Ryujinx.Common.Memory;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.Audio.Backends.Apple.Native
+{
+    public static partial class AudioToolbox
+    {
+        [StructLayout(LayoutKind.Sequential)]
+        internal struct AudioStreamBasicDescription
+        {
+            public double SampleRate;
+            public uint FormatID;
+            public uint FormatFlags;
+            public uint BytesPerPacket;
+            public uint FramesPerPacket;
+            public uint BytesPerFrame;
+            public uint ChannelsPerFrame;
+            public uint BitsPerChannel;
+            public uint Reserved;
+        }
+
+        [StructLayout(LayoutKind.Sequential)]
+        internal struct AudioChannelLayout
+        {
+            public uint AudioChannelLayoutTag;
+            public uint AudioChannelBitmap;
+            public uint NumberChannelDescriptions;
+        }
+
+        internal const uint kAudioFormatLinearPCM = 0x6C70636D;
+        internal const uint kAudioQueueProperty_ChannelLayout = 0x6171636c;
+        internal const uint kAudioChannelLayoutTag_MPEG_5_1_A = 0x650006;
+        internal const uint kAudioFormatFlagIsFloat = (1 << 0);
+        internal const uint kAudioFormatFlagIsSignedInteger = (1 << 2);
+        internal const uint kAudioFormatFlagIsPacked = (1 << 3);
+        internal const uint kAudioFormatFlagIsBigEndian = (1 << 1);
+        internal const uint kAudioFormatFlagIsAlignedHigh = (1 << 4);
+        internal const uint kAudioFormatFlagIsNonInterleaved = (1 << 5);
+
+        [LibraryImport("/System/Library/Frameworks/AudioToolbox.framework/AudioToolbox")]
+        internal static partial int AudioQueueNewOutput(
+            ref AudioStreamBasicDescription format,
+            nint callback,
+            nint userData,
+            nint callbackRunLoop,
+            nint callbackRunLoopMode,
+            uint flags,
+            out nint audioQueue);
+
+        [LibraryImport("/System/Library/Frameworks/AudioToolbox.framework/AudioToolbox")]
+        internal static partial int AudioQueueSetProperty(
+            nint audioQueue,
+            uint propertyID,
+            ref AudioChannelLayout layout,
+            uint layoutSize);
+
+        [LibraryImport("/System/Library/Frameworks/AudioToolbox.framework/AudioToolbox")]
+        internal static partial int AudioQueueDispose(nint audioQueue, [MarshalAs(UnmanagedType.I1)] bool immediate);
+
+        [LibraryImport("/System/Library/Frameworks/AudioToolbox.framework/AudioToolbox")]
+        internal static partial int AudioQueueAllocateBuffer(
+            nint audioQueue,
+            uint bufferByteSize,
+            out nint buffer);
+
+        [LibraryImport("/System/Library/Frameworks/AudioToolbox.framework/AudioToolbox")]
+        internal static partial int AudioQueueStart(nint audioQueue, nint startTime);
+
+        [LibraryImport("/System/Library/Frameworks/AudioToolbox.framework/AudioToolbox")]
+        internal static partial int AudioQueuePause(nint audioQueue);
+
+        [LibraryImport("/System/Library/Frameworks/AudioToolbox.framework/AudioToolbox")]
+        internal static partial int AudioQueueStop(nint audioQueue, [MarshalAs(UnmanagedType.I1)] bool immediate);
+
+        [LibraryImport("/System/Library/Frameworks/AudioToolbox.framework/AudioToolbox")]
+        internal static partial int AudioQueueSetParameter(
+            nint audioQueue,
+            uint parameterID,
+            float value);
+
+        [LibraryImport("/System/Library/Frameworks/AudioToolbox.framework/AudioToolbox")]
+        internal static partial int AudioQueueEnqueueBuffer(
+            nint audioQueue,
+            nint buffer,
+            uint numPacketDescs,
+            nint packetDescs);
+
+        [StructLayout(LayoutKind.Sequential)]
+        internal struct AudioQueueBuffer
+        {
+            public uint AudioDataBytesCapacity;
+            public nint AudioData;
+            public uint AudioDataByteSize;
+            public nint UserData;
+            public uint PacketDescriptionCapacity;
+            public nint PacketDescriptions;
+            public uint PacketDescriptionCount;
+        }
+
+        internal const uint kAudioQueueParam_Volume = 1;
+    }
+}