From b7d58ef36558da095a6aceed27077867f948ff41 Mon Sep 17 00:00:00 2001
From: Aron Parker <hl3mukkel@gmail.com>
Date: Thu, 22 Feb 2018 00:41:14 +0100
Subject: [PATCH] Added support for x264vfw

---
 AviRecorder/Video/Avi/FourCC.cs               |  1 +
 .../Video/Compression/VideoCompressorInfo.cs  | 32 +++++++++++++++----
 2 files changed, 27 insertions(+), 6 deletions(-)

diff --git a/AviRecorder/Video/Avi/FourCC.cs b/AviRecorder/Video/Avi/FourCC.cs
index 4c3540e..7d508f4 100644
--- a/AviRecorder/Video/Avi/FourCC.cs
+++ b/AviRecorder/Video/Avi/FourCC.cs
@@ -40,6 +40,7 @@ public static class FourCC
 #if COMPATIBILITY
         public const uint i420 = 'i' << 0 | '4' << 8 | '2' << 16 | '0' << 24;
         public const uint LAGS = 'L' << 0 | 'A' << 8 | 'G' << 16 | 'S' << 24;
+        public const uint x264 = 'X' << 0 | '2' << 8 | '6' << 16 | '4' << 24;
 #endif
 
         public static uint Make(string fcc)
diff --git a/AviRecorder/Video/Compression/VideoCompressorInfo.cs b/AviRecorder/Video/Compression/VideoCompressorInfo.cs
index b60a7a4..228778a 100644
--- a/AviRecorder/Video/Compression/VideoCompressorInfo.cs
+++ b/AviRecorder/Video/Compression/VideoCompressorInfo.cs
@@ -52,21 +52,41 @@ public static VideoCompressorInfo[] GetCompressorInfos()
 #endif
 
                 using (var hic = ICOpen(FourCC.VIDC, icInfo.fccHandler, IcMode.Compress))
-                    if (!hic.IsInvalid && ICGetInfo(hic, ref icInfo, (uint)Marshal.SizeOf<ICINFO>()) != IntPtr.Zero && SupportsFlags(icInfo.dwFlags))
-                        results.Add(new VideoCompressorInfo(ref icInfo));
+                {
+                    if (hic.IsInvalid)
+                        continue;
+
+                    if (ICGetInfo(hic, ref icInfo, (uint)Marshal.SizeOf<ICINFO>()) == IntPtr.Zero)
+                        continue;
+                    
+                    if (!SupportsVideoCompressor(ref icInfo))
+                        continue;
+
+                    results.Add(new VideoCompressorInfo(ref icInfo));
+                }
             }
 
             return results.ToArray();
         }
 
-        private static bool SupportsFlags(VideoCompressorFlags dwFlags)
+        private static bool SupportsVideoCompressor(ref ICINFO icInfo)
         {
-            const VideoCompressorFlags unsupportedFlags = VideoCompressorFlags.Quality | VideoCompressorFlags.Crunch | VideoCompressorFlags.CompressFrames;
+#if COMPATIBILITY
+            if (icInfo.fccHandler == FourCC.x264)
+                return true;
+#endif
 
-            if ((dwFlags & unsupportedFlags) != 0)
+            const VideoCompressorFlags unsupportedFlags = VideoCompressorFlags.Quality |
+                                                          VideoCompressorFlags.Crunch |
+                                                          VideoCompressorFlags.CompressFrames;
+
+            if ((icInfo.dwFlags & unsupportedFlags) != 0)
                 return false;
 
-            return (dwFlags & VideoCompressorFlags.Temporal) == 0 || (dwFlags & VideoCompressorFlags.FastTemporalC) != 0;
+            bool requiresPreviousFrame = (icInfo.dwFlags & VideoCompressorFlags.Temporal) != 0 &&
+                                         (icInfo.dwFlags & VideoCompressorFlags.FastTemporalC) == 0;
+
+            return !requiresPreviousFrame;
         }
     }
 }