create IMovieSession with the necessary API, instead of using an instance of MovieSession, the API though is completetly horrible, we need to address this

BizHawk.Client.Common/BizHawk.Client.Common.csproj

@@ -187,6 +187,7 @@
     <Compile Include="movie\interfaces\ILogEntryGenerator.cs" />
     <Compile Include="movie\interfaces\IMovie.cs" />
     <Compile Include="movie\interfaces\IMovieController.cs" />
+    <Compile Include="movie\interfaces\IMovieSession.cs" />
     <Compile Include="movie\MovieService.cs" />
     <Compile Include="movie\MovieSession.cs" />
     <Compile Include="movie\MultitrackRecording.cs" />

BizHawk.Client.Common/Global.cs

@@ -14,7 +14,7 @@ namespace BizHawk.Client.Common
 		public static FirmwareManager FirmwareManager;
 		public static Rewinder Rewinder;
 
-		public static MovieSession MovieSession = new MovieSession();
+		public static IMovieSession MovieSession = new MovieSession();
 
 		/// <summary>
 		/// Used to disable secondary throttling (e.g. vsync, audio) for unthrottled modes or when the primary (clock) throttle is taking over (e.g. during fast forward/rewind).

BizHawk.Client.Common/movie/MovieSession.cs

@@ -13,7 +13,7 @@ namespace BizHawk.Client.Common
 {
 	public enum MovieEndAction { Stop, Pause, Record, Finish }
 
-	public class MovieSession
+	public class MovieSession : IMovieSession
 	{
 		public MovieSession()
 		{
@@ -437,8 +437,8 @@ namespace BizHawk.Client.Common
 
 		// The behavior here is to only temporarily override these settings when playing a movie and then restore the user's preferred settings
 		// A more elegant approach would be appreciated
-		public bool? PreviousNES_InQuickNES = null;
-		public bool? PreviousSNES_InSnes9x = null;
+		public bool? PreviousNES_InQuickNES { get; set; }
+		public bool? PreviousSNES_InSnes9x { get; set; }
 
 		public void QueueNewMovie(IMovie movie, bool record, IEmulator emulator)
 		{

BizHawk.Client.Common/movie/interfaces/IMovieSession.cs

@@ -0,0 +1,40 @@
+using System.IO;
+using BizHawk.Emulation.Common;
+
+namespace BizHawk.Client.Common
+{
+	public interface IMovieSession
+	{
+		IMovie Movie { get; set; }
+		IMovie QueuedMovie { get; }
+		IMovieController MovieControllerAdapter { get; }
+		IMovieController MovieControllerInstance();
+		MultitrackRecorder MultiTrack { get; }
+
+		IController PreviousFrame { get; }
+		IController CurrentInput { get; }
+
+		bool ReadOnly { get; set; }
+		bool MovieIsQueued { get; }
+
+		bool? PreviousNES_InQuickNES { get; set; }
+		bool? PreviousSNES_InSnes9x { get; set; }
+
+		void HandleMovieOnFrameLoop();
+		void HandleMovieSaveState(TextWriter writer);
+		bool HandleMovieLoadState(string path);
+
+		// To function as a MovieSession, you must have hacky LoadState steps, non-hacky steps just won't do
+		bool HandleMovieLoadState_HackyStep1(TextReader reader);
+		bool HandleMovieLoadState_HackyStep2(TextReader reader);
+
+		ILogEntryGenerator LogGeneratorInstance();
+
+		void QueueNewMovie(IMovie movie, bool record, IEmulator emulator);
+		void RunQueuedMovie(bool recordMode);
+
+		void ToggleMultitrack();
+
+		void StopMovie(bool saveChanges = true);
+	}
+}