Display the HDR option if the platform has a decoder that supports it

app/streaming/video/ffmpeg-renderers/drm.cpp

@@ -410,8 +410,15 @@ enum AVPixelFormat DrmRenderer::getPreferredPixelFormat(int)
 
 int DrmRenderer::getRendererAttributes()
 {
+    int attributes = 0;
+
     // This renderer can only draw in full-screen
-    return RENDERER_ATTRIBUTE_FULLSCREEN_ONLY;
+    attributes |= RENDERER_ATTRIBUTE_FULLSCREEN_ONLY;
+
+    // This renderer supports HDR
+    attributes |= RENDERER_ATTRIBUTE_HDR_SUPPORT;
+
+    return attributes;
 }
 
 void DrmRenderer::setHdrMode(bool enabled)

app/streaming/video/ffmpeg-renderers/renderer.h

@@ -90,6 +90,7 @@ private:
 
 #define RENDERER_ATTRIBUTE_FULLSCREEN_ONLY 0x01
 #define RENDERER_ATTRIBUTE_1080P_MAX 0x02
+#define RENDERER_ATTRIBUTE_HDR_SUPPORT 0x04
 
 class IFFmpegRenderer : public Overlay::IOverlayRenderer {
 public:

app/streaming/video/ffmpeg-renderers/vt.mm

@@ -505,6 +505,12 @@ public:
         return COLORSPACE_REC_601;
     }
 
+    int getRendererAttributes() override
+    {
+        // AVSampleBufferDisplayLayer supports HDR output
+        return RENDERER_ATTRIBUTE_HDR_SUPPORT;
+    }
+
 private:
     AVBufferRef* m_HwContext;
     AVSampleBufferDisplayLayer* m_DisplayLayer;