From 1ec1f5d3be7c3db26beba7b542b3addd8e299643 Mon Sep 17 00:00:00 2001
From: Cameron Gutman <aicommander@gmail.com>
Date: Sun, 22 May 2022 22:29:18 -0500
Subject: [PATCH] Switch to D3D11VA by default on Windows ARM64

It performs much better at 4K on Surface Pro X
---
 app/streaming/video/ffmpeg-renderers/dxva2.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/app/streaming/video/ffmpeg-renderers/dxva2.cpp b/app/streaming/video/ffmpeg-renderers/dxva2.cpp
index ff1bacfa..3b52c998 100644
--- a/app/streaming/video/ffmpeg-renderers/dxva2.cpp
+++ b/app/streaming/video/ffmpeg-renderers/dxva2.cpp
@@ -700,11 +700,19 @@ bool DXVA2Renderer::initialize(PDECODER_PARAMETERS params)
     if (params->videoFormat == VIDEO_FORMAT_H265_MAIN10) {
         return false;
     }
+#ifdef Q_PROCESSOR_X86
     else if (qgetenv("DXVA2_ENABLED") == "0") {
         SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION,
                     "DXVA2 is disabled by environment variable");
         return false;
     }
+#else
+    else if (qgetenv("DXVA2_ENABLED") != "1") {
+        SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION,
+                    "DXVA2 is disabled by default on ARM64. Set DXVA2_ENABLED=1 to override.");
+        return false;
+    }
+#endif
 
     m_VideoFormat = params->videoFormat;
     m_VideoWidth = params->width;