From eef270de2697e98cc6d7a26cbdadfc89ddbea82e Mon Sep 17 00:00:00 2001
From: Cameron Gutman <aicommander@gmail.com>
Date: Sun, 15 Oct 2023 15:30:41 -0500
Subject: [PATCH] Fix HDR with external displays on macOS Sonoma

Fixes #1079
---
 app/streaming/video/ffmpeg-renderers/vt.mm | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/app/streaming/video/ffmpeg-renderers/vt.mm b/app/streaming/video/ffmpeg-renderers/vt.mm
index d8d9ffc2..0db46df7 100644
--- a/app/streaming/video/ffmpeg-renderers/vt.mm
+++ b/app/streaming/video/ffmpeg-renderers/vt.mm
@@ -301,7 +301,18 @@ public:
                 m_ColorSpace = CGColorSpaceCreateWithName(kCGColorSpaceITUR_709);
                 break;
             case COLORSPACE_REC_2020:
-                m_ColorSpace = CGColorSpaceCreateWithName(kCGColorSpaceITUR_2020);
+                // This is necessary to ensure HDR works properly with external displays on macOS Sonoma.
+                if (frame->color_trc == AVCOL_TRC_SMPTE2084) {
+                    if (@available(macOS 11.0, *)) {
+                        m_ColorSpace = CGColorSpaceCreateWithName(kCGColorSpaceITUR_2100_PQ);
+                    }
+                    else {
+                        m_ColorSpace = CGColorSpaceCreateWithName(kCGColorSpaceITUR_2020);
+                    }
+                }
+                else {
+                    m_ColorSpace = CGColorSpaceCreateWithName(kCGColorSpaceITUR_2020);
+                }
                 break;
             case COLORSPACE_REC_601:
                 m_ColorSpace = CGColorSpaceCreateWithName(kCGColorSpaceSRGB);