From fd314db27ebddf410e4d599d29bd9efe589e9755 Mon Sep 17 00:00:00 2001
From: ns6089 <61738816+ns6089@users.noreply.github.com>
Date: Mon, 3 Nov 2025 00:55:51 +0300
Subject: [PATCH] Use correct chroma co-siting offsets in D3D11

Introduced in f67272b15312fb30ae4d5f5dfb71843ee5610518
---
 .../video/ffmpeg-renderers/d3d11va.cpp        | 31 +++++++++----------
 1 file changed, 14 insertions(+), 17 deletions(-)

diff --git a/app/streaming/video/ffmpeg-renderers/d3d11va.cpp b/app/streaming/video/ffmpeg-renderers/d3d11va.cpp
index 962dde76..c2c730ad 100644
--- a/app/streaming/video/ffmpeg-renderers/d3d11va.cpp
+++ b/app/streaming/video/ffmpeg-renderers/d3d11va.cpp
@@ -786,41 +786,38 @@ void D3D11VARenderer::bindColorConversion(AVFrame* frame)
     switch (frame->chroma_location) {
     default:
     case AVCHROMA_LOC_LEFT:
-        constBuf.chromaOffset[0] = 0;
-        constBuf.chromaOffset[1] = 0.5;
+        constBuf.chromaOffset[0] = 0.5;
+        constBuf.chromaOffset[1] = 0;
         break;
     case AVCHROMA_LOC_CENTER:
+        constBuf.chromaOffset[0] = 0;
+        constBuf.chromaOffset[1] = 0;
+        break;
+    case AVCHROMA_LOC_TOPLEFT:
         constBuf.chromaOffset[0] = 0.5;
         constBuf.chromaOffset[1] = 0.5;
         break;
-    case AVCHROMA_LOC_TOPLEFT:
-        constBuf.chromaOffset[0] = 0;
-        constBuf.chromaOffset[1] = 0;
-        break;
     case AVCHROMA_LOC_TOP:
-        constBuf.chromaOffset[0] = 0.5;
-        constBuf.chromaOffset[1] = 0;
+        constBuf.chromaOffset[0] = 0;
+        constBuf.chromaOffset[1] = 0.5;
         break;
     case AVCHROMA_LOC_BOTTOMLEFT:
-        constBuf.chromaOffset[0] = 0;
-        constBuf.chromaOffset[1] = 1.0;
+        constBuf.chromaOffset[0] = 0.5;
+        constBuf.chromaOffset[1] = -0.5;
         break;
     case AVCHROMA_LOC_BOTTOM:
-        constBuf.chromaOffset[0] = 0.5;
-        constBuf.chromaOffset[1] = 1.0;
+        constBuf.chromaOffset[0] = 0;
+        constBuf.chromaOffset[1] = -0.5;
         break;
     }
+    constBuf.chromaOffset[0] /= m_TextureWidth;
+    constBuf.chromaOffset[1] /= m_TextureHeight;
 
     if (yuv444) {
         // 4:4:4 has no subsampling
         constBuf.chromaOffset[0] = 0;
         constBuf.chromaOffset[1] = 0;
     }
-    else {
-        // 4:2:0 has 2x2 subsampling
-        constBuf.chromaOffset[0] /= m_TextureWidth / 2;
-        constBuf.chromaOffset[1] /= m_TextureHeight / 2;
-    }
 
     D3D11_SUBRESOURCE_DATA constData = {};
     constData.pSysMem = &constBuf;