Add synchronized MPEG movie audio

godot/IMovieDecoder.cs

@@ -1,7 +1,9 @@
 using System;
-using System.Runtime.Versioning;
 using Age.Engine.Sys4;
 
+internal readonly record struct MovieAudioInfo(int SampleRate, int Channels);
+internal sealed record MovieAudioChunk(float[] InterleavedStereo, int FrameCount, long PresentationTimeMs);
+
 /// <summary>
 /// Platform-neutral movie playback boundary. Construction is synchronous so metadata needed by the VM is
 /// available before op 0x236 returns; frame delivery and completion remain asynchronous.
@@ -12,15 +14,18 @@ internal interface IMovieDecoder : IDisposable
     bool IsCompleted { get; }
     string? Failure { get; }
     bool TryTakeFrame(out RgbaImage frame);
+    MovieAudioInfo? AudioInfo => null;
+    bool AudioDecodingCompleted => true;
+    bool TryTakeAudioChunk(out MovieAudioChunk chunk)
+    {
+        chunk = default!;
+        return false;
+    }
+    void AdvancePlaybackClock(long elapsedMilliseconds) { }
+    void MarkAudioSubmitted() { }
 }
 
 internal interface IMovieDecoderFactory
 {
     IMovieDecoder Open(MoviePayload movie);
 }
-
-[SupportedOSPlatform("windows")]
-internal sealed class DirectShowMovieDecoderFactory : IMovieDecoderFactory
-{
-    public IMovieDecoder Open(MoviePayload movie) => new DirectShowMovieDecoder(movie);
-}