Add support for HLG HDR video thumbnails

Android added support for correctly applying color transfer for
thumbnails of HDR videos with PQ color transfer, this expands it to HLG
color transfer.

Bug: 151096599
Test: manual - see bug
Change-Id: I880b2baeeab49a623fcc6e3568c1569b9d3788e4

media/libstagefright/FrameCaptureLayer.cpp

@@ -67,7 +67,8 @@ ui::Dataspace translateDataspace(ui::Dataspace dataspace) {
 bool isHdrY410(const BufferItem &bi) {
     ui::Dataspace dataspace = translateDataspace(static_cast<ui::Dataspace>(bi.mDataSpace));
     // pixel format is HDR Y410 masquerading as RGBA_1010102
-    return (dataspace == ui::Dataspace::BT2020_ITU_PQ &&
+    return ((dataspace == ui::Dataspace::BT2020_ITU_PQ ||
+            dataspace == ui::Dataspace::BT2020_ITU_HLG) &&
             bi.mGraphicBuffer->getPixelFormat() == HAL_PIXEL_FORMAT_RGBA_1010102);
 }
 

media/libstagefright/FrameDecoder.cpp

@@ -248,7 +248,8 @@ bool isHDR(const sp<AMessage> &format) {
         transfer = 0;
     }
     return standard == ColorUtils::kColorStandardBT2020 &&
-            transfer == ColorUtils::kColorTransferST2084;
+            (transfer == ColorUtils::kColorTransferST2084 ||
+            transfer == ColorUtils::kColorTransferHLG);
 }
 
 status_t FrameDecoder::init(