Connect <video> tag to gstreamer vaapisink

vaapi.patch

diff --git a/Source/WebCore/platform/graphics/gstreamer/ImageGStreamer.h b/Source/WebCore/platform/graphics/gstreamer/ImageGStreamer.h
index f952ad6..c8249b2 100644
--- a/Source/WebCore/platform/graphics/gstreamer/ImageGStreamer.h
+++ b/Source/WebCore/platform/graphics/gstreamer/ImageGStreamer.h
@@ -60,7 +60,8 @@ class ImageGStreamer : public RefCounted<ImageGStreamer> {
         }
 
     private:
-        ImageGStreamer(GstSample*);
+        ImageGStreamer(GstBuffer* buffer, GstCaps* caps);
+		ImageGStreamer(GstSample* sample) : ImageGStreamer(gst_sample_get_buffer(sample), gst_sample_get_caps(sample)) { }
         RefPtr<BitmapImage> m_image;
         FloatRect m_cropRect;
 
diff --git a/Source/WebCore/platform/graphics/gstreamer/ImageGStreamerCairo.cpp b/Source/WebCore/platform/graphics/gstreamer/ImageGStreamerCairo.cpp
index ee27277..ade6d2a 100644
--- a/Source/WebCore/platform/graphics/gstreamer/ImageGStreamerCairo.cpp
+++ b/Source/WebCore/platform/graphics/gstreamer/ImageGStreamerCairo.cpp
@@ -32,9 +32,8 @@
 using namespace std;
 using namespace WebCore;
 
-ImageGStreamer::ImageGStreamer(GstSample* sample)
+ImageGStreamer::ImageGStreamer(GstBuffer* buffer, GstCaps* caps)
 {
-    GstCaps* caps = gst_sample_get_caps(sample);
     GstVideoInfo videoInfo;
     gst_video_info_init(&videoInfo);
     if (!gst_video_info_from_caps(&videoInfo, caps))
@@ -43,7 +42,6 @@ ImageGStreamer::ImageGStreamer(GstSample* sample)
     // Right now the TextureMapper only supports chromas with one plane
     ASSERT(GST_VIDEO_INFO_N_PLANES(&videoInfo) == 1);
 
-    GstBuffer* buffer = gst_sample_get_buffer(sample);
     if (!gst_video_frame_map(&m_videoFrame, &videoInfo, buffer, GST_MAP_READ))
         return;
 
diff --git a/Source/WebCore/platform/graphics/gstreamer/ImageGStreamerQt.cpp b/Source/WebCore/platform/graphics/gstreamer/ImageGStreamerQt.cpp
index 20ce58e..d252c06 100644
--- a/Source/WebCore/platform/graphics/gstreamer/ImageGStreamerQt.cpp
+++ b/Source/WebCore/platform/graphics/gstreamer/ImageGStreamerQt.cpp
@@ -32,9 +32,8 @@
 using namespace std;
 using namespace WebCore;
 
-ImageGStreamer::ImageGStreamer(GstSample* sample)
+ImageGStreamer::ImageGStreamer(GstBuffer* buffer, GstCaps* caps)
 {
-    GstCaps* caps = gst_sample_get_caps(sample);
     GstVideoInfo videoInfo;
     gst_video_info_init(&videoInfo);
     if (!gst_video_info_from_caps(&videoInfo, caps))
@@ -44,7 +43,6 @@ ImageGStreamer::ImageGStreamer(GstSample* sample)
     // Right now the TextureMapper only supports chromas with one plane
     ASSERT(GST_VIDEO_INFO_N_PLANES(&videoInfo) == 1);
 
-    GstBuffer* buffer = gst_sample_get_buffer(sample);
     if (!gst_video_frame_map(&m_videoFrame, &videoInfo, buffer, GST_MAP_READ))
         return;
 
diff --git a/Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamerBase.cpp b/Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamerBase.cpp
index 310a022..7ee25b3 100644
--- a/Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamerBase.cpp
+++ b/Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamerBase.cpp
@@ -589,6 +589,22 @@ gboolean MediaPlayerPrivateGStreamerBase::drawCallback(MediaPlayerPrivateGStream
 }
 #endif
 
+#if USE(VAAPI)
+void MediaPlayerPrivateGStreamerBase::handoffCallback(MediaPlayerPrivateGStreamerBase* player, GstBuffer* buffer)
+{
+	player->triggerRepaint(
+		adoptGRef(
+			gst_sample_new(
+				buffer,
+				gst_caps_from_string("video/x-raw(memory:VASurface, meta:GstVideoOverlayComposition), format=(string){ ENCODED, NV12, I420, YV12 }, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]"),
+				NULL,
+				NULL
+			)
+		).get()
+	);
+}
+#endif
+
 void MediaPlayerPrivateGStreamerBase::setSize(const IntSize& size)
 {
     m_size = size;
@@ -737,6 +753,14 @@ GstElement* MediaPlayerPrivateGStreamerBase::createVideoSink()
     }
 #endif
 
+#if USE(VAAPI)
+	m_videoSink = gst_element_factory_make("vaapisink", nullptr);
+	if (m_videoSink) {
+		g_signal_connect_swapped(m_videoSink.get(), "handoff", G_CALLBACK(handoffCallback), this);
+		videoSink = m_videoSink.get();
+	}
+#endif
+
     if (!m_videoSink) {
         m_usingFallbackVideoSink = true;
         m_videoSink = webkitVideoSinkNew();
diff --git a/Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamerBase.h b/Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamerBase.h
index 7eca22f..969419e 100644
--- a/Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamerBase.h
+++ b/Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamerBase.h
@@ -135,6 +135,9 @@ protected:
 #if USE(GSTREAMER_GL)
     static gboolean drawCallback(MediaPlayerPrivateGStreamerBase*, GstGLContext*, GstSample*);
 #endif
+#if USE(VAAPI)
+	static void handoffCallback(MediaPlayerPrivateGStreamerBase*, GstBuffer*);
+#endif
 
     void notifyPlayerOfVolumeChange();
     void notifyPlayerOfMute();
diff --git a/Source/cmake/OptionsQt.cmake b/Source/cmake/OptionsQt.cmake
index c22658f..75f5676 100644
--- a/Source/cmake/OptionsQt.cmake
+++ b/Source/cmake/OptionsQt.cmake
@@ -96,6 +96,8 @@ cmake_dependent_option(ENABLE_TEST_SUPPORT "Build tools for running layout tests
                                            "DEVELOPER_MODE" OFF)
 option(USE_STATIC_RUNTIME "Use static runtime (MSVC only)" OFF)
 
+WEBKIT_OPTION_DEFINE(USE_VAAPI "Whether to enable Intel VAAPI hardware video decoder." PRIVATE OFF)
+
 # Public options shared with other WebKit ports. There must be strong reason
 # to support changing the value of the option.
 WEBKIT_OPTION_DEFAULT_PORT_VALUE(ENABLE_ALLINONE_BUILD PUBLIC ON)

I guess it's better to store sample in local variable before calling get, e.g.

GRefPtr<GstSample> sample = gst_sample_new...
player->triggerRepaint(sample.get());