gbm: Set max bpc for high bit depth videos

Author: popcornmix

xbmc/cores/VideoPlayer/VideoRenderers/HwDecRender/VideoLayerBridgeDRMPRIME.cpp

@@ -46,6 +46,13 @@ void CVideoLayerBridgeDRMPRIME::Disable()
     m_DRM->AddProperty(connector, "Colorspace", value);
   }
 
+  CLog::Log(LOGDEBUG, "CVideoLayerBridgeDRMPRIME::{} - setting max bpc to 8", __FUNCTION__);
+  result = m_DRM->AddProperty(connector, "max bpc", 8);
+  if (!result)
+  {
+    CLog::Log(LOGDEBUG, "CVideoLayerBridgeDRMPRIME::{} - failed to reset max bpc to 8", __FUNCTION__);
+  }
+
   // disable HDR metadata
   if (connector->SupportsProperty("HDR_OUTPUT_METADATA"))
   {
@@ -185,6 +192,11 @@ void CVideoLayerBridgeDRMPRIME::Configure(CVideoBufferDRMPRIME* buffer)
 
   auto connector = m_DRM->GetConnector();
 
+  int bpc = 8;
+
+  if (picture.colorBits > 8)
+    bpc = 12;
+
   std::tie(result, value) =  connector->GetPropertyValue("Colorspace", GetColorimetry(picture));
   if (result)
   {
@@ -194,6 +206,10 @@ void CVideoLayerBridgeDRMPRIME::Configure(CVideoBufferDRMPRIME* buffer)
     m_DRM->SetActive(true);
   }
 
+  CLog::Log(LOGDEBUG, "CVideoLayerBridgeDRMPRIME::{} - setting max bpc to {} ({})", __FUNCTION__,
+            bpc, result);
+  result = m_DRM->AddProperty(connector, "max bpc", bpc);
+
   if (connector->SupportsProperty("HDR_OUTPUT_METADATA"))
   {
     m_hdr_metadata.metadata_type = HDMI_STATIC_METADATA_TYPE1;