GStreamer: Rank down the gstreamer-vaapi plugins

Gstreamer-vaapi plugins not working while selecting driver as iHD.
Vaapi plugins are disabled from gstreamer release 1.22.0 and suggested
to use va plugins instead. Ranked down gstreamer-vaapi plugins if
Gstreamer version is less than 1.22

Task-number: QTBUG-123931
Pick-to: 6.5 6.7
Change-Id: I98965cda299394665947e0453699299e0320709d
Reviewed-by: Tim Blechmann <tim@klingt.org>
Reviewed-by: Artem Dyomin <artem.dyomin@qt.io>

2 files changed, 28 insertions, 0 deletions

diff --git a/src/plugins/multimedia/gstreamer/common/qgst_handle_types_p.h b/src/plugins/multimedia/gstreamer/common/qgst_handle_types_p.h
index 9f990c8e7..b72e92db1 100644
--- a/src/plugins/multimedia/gstreamer/common/qgst_handle_types_p.h
+++ b/src/plugins/multimedia/gstreamer/common/qgst_handle_types_p.h
@@ -240,6 +240,7 @@ using QUniqueGErrorHandle = QUniqueHandle<QGstImpl::QUniqueGErrorHandleTraits>;
 using QFileDescriptorHandle = QUniqueHandle<QGstImpl::QFileDescriptorHandleTraits>;
 using QGstContextHandle = QGstImpl::QGstMiniObjectHandleHelper<GstContext>::UniqueHandle;
 using QGstGstDateTimeHandle = QGstImpl::QGstMiniObjectHandleHelper<GstDateTime>::SharedHandle;
+using QGstPluginFeatureHandle = QGstImpl::QGstHandleHelper<GstPluginFeature>::SharedHandle;
 
 #if QT_CONFIG(gstreamer_gl)
 using QGstGLContextHandle = QGstImpl::QGstHandleHelper<GstGLContext>::UniqueHandle;
diff --git a/src/plugins/multimedia/gstreamer/qgstreamerintegration.cpp b/src/plugins/multimedia/gstreamer/qgstreamerintegration.cpp
index be139cae0..4ee5b36e8 100644
--- a/src/plugins/multimedia/gstreamer/qgstreamerintegration.cpp
+++ b/src/plugins/multimedia/gstreamer/qgstreamerintegration.cpp
@@ -25,6 +25,33 @@ QGstreamerIntegration::QGstreamerIntegration()
 {
     gst_init(nullptr, nullptr);
     qCDebug(lcGstreamer) << "Using gstreamer version: " << gst_version_string();
+
+    if constexpr (!GST_CHECK_VERSION(1, 22, 0)) {
+        GstRegistry* reg = gst_registry_get();
+        const auto pluginNames = {
+            "vaapidecodebin",
+            "vaapih264dec",
+            "vaapih264enc",
+            "vaapih265dec",
+            "vaapijpegdec",
+            "vaapijpegenc",
+            "vaapimpeg2dec",
+            "vaapipostproc",
+            "vaapisink",
+            "vaapivp8dec",
+            "vaapivp9dec"
+        };
+
+        for (auto name : pluginNames) {
+            QGstPluginFeatureHandle pluginFeature {
+                gst_registry_lookup_feature(reg, name),
+                QGstPluginFeatureHandle::HasRef,
+            };
+            if (pluginFeature) {
+                gst_plugin_feature_set_rank(pluginFeature.get(), GST_RANK_PRIMARY - 1);
+            }
+        }
+    }
 }
 
 QPlatformMediaFormatInfo *QGstreamerIntegration::createFormatInfo()