stream video from memory

src/Video/Video.cs

@@ -17,6 +17,8 @@ namespace MoonWorks.Video
 	public unsafe class Video : IDisposable
 	{
 		internal IntPtr Handle;
+		private IntPtr rwData;
+		private void* videoData;
 
 		public bool Loop { get; private set; }
 		public float Volume {
@@ -71,7 +73,12 @@ namespace MoonWorks.Video
 				throw new ArgumentException("Video file not found!");
 			}
 
-			if (Theorafile.tf_fopen(filename, out Handle) < 0)
+			var bytes = System.IO.File.ReadAllBytes(filename);
+			videoData = NativeMemory.Alloc((nuint) bytes.Length);
+			Marshal.Copy(bytes, 0, (IntPtr) videoData, bytes.Length);
+			rwData = SDL2.SDL.SDL_RWFromMem((IntPtr) videoData, bytes.Length);
+
+			if (Theorafile.tf_open_callbacks(rwData, out Handle, callbacks) < 0)
 			{
 				throw new ArgumentException("Invalid video file!");
 			}
@@ -317,6 +324,17 @@ namespace MoonWorks.Video
 			currentFrame = -1;
 		}
 
+		private static IntPtr Read(IntPtr ptr, IntPtr size, IntPtr nmemb, IntPtr datasource) => (IntPtr) SDL2.SDL.SDL_RWread(datasource, ptr, size, nmemb);
+		private static int Seek(IntPtr datasource, long offset, Theorafile.SeekWhence whence) => (int) SDL2.SDL.SDL_RWseek(datasource, offset, (int) whence);
+		private static int Close(IntPtr datasource) => (int) SDL2.SDL.SDL_RWclose(datasource);
+
+		private static Theorafile.tf_callbacks callbacks = new Theorafile.tf_callbacks
+		{
+			read_func = Read,
+			seek_func = Seek,
+			close_func = Close
+		};
+
 		protected virtual void Dispose(bool disposing)
 		{
 			if (!disposed)
@@ -332,6 +350,7 @@ namespace MoonWorks.Video
 				// free unmanaged resources (unmanaged objects)
 				Theorafile.tf_close(ref Handle);
 				NativeMemory.Free(yuvData);
+				NativeMemory.Free(videoData);
 
 				disposed = true;
 			}