GStreamer: add qIsGstObjectOfType and unit tests for casts

Pick-to: 6.5 6.7
Change-Id: Idc10294704a28c6fae08cfa095d35df76fda1d0d
Reviewed-by: Artem Dyomin <artem.dyomin@qt.io>

3 files changed, 44 insertions, 0 deletions

diff --git a/src/plugins/multimedia/gstreamer/common/qgst_p.h b/src/plugins/multimedia/gstreamer/common/qgst_p.h
index 34b7e7e22..285a4ec47 100644
--- a/src/plugins/multimedia/gstreamer/common/qgst_p.h
+++ b/src/plugins/multimedia/gstreamer/common/qgst_p.h
@@ -145,6 +145,13 @@ struct GstObjectTraits<GObject>
 } // namespace QGstImpl
 
 template <typename DestinationType, typename SourceType>
+bool qIsGstObjectOfType(SourceType *arg)
+{
+    using Traits = QGstImpl::GstObjectTraits<DestinationType>;
+    return arg && Traits::isObjectOfType(arg);
+}
+
+template <typename DestinationType, typename SourceType>
 DestinationType *qGstSafeCast(SourceType *arg)
 {
     using Traits = QGstImpl::GstObjectTraits<DestinationType>;
diff --git a/tests/auto/unit/multimedia/gstreamer_backend/tst_gstreamer_backend.cpp b/tests/auto/unit/multimedia/gstreamer_backend/tst_gstreamer_backend.cpp
index 763ff01bf..2cecbe21b 100644
--- a/tests/auto/unit/multimedia/gstreamer_backend/tst_gstreamer_backend.cpp
+++ b/tests/auto/unit/multimedia/gstreamer_backend/tst_gstreamer_backend.cpp
@@ -7,6 +7,7 @@
 
 #include <QtQGstreamerMediaPlugin/private/qgst_handle_types_p.h>
 #include <QtQGstreamerMediaPlugin/private/qgst_p.h>
+#include <QtQGstreamerMediaPlugin/private/qgstpipeline_p.h>
 #include <QtQGstreamerMediaPlugin/private/qgstreamermetadata_p.h>
 
 QT_USE_NAMESPACE
@@ -27,6 +28,38 @@ QGstTagListHandle tst_GStreamer::parseTagList(const QByteArray &ba)
     return parseTagList(ba.constData());
 }
 
+void tst_GStreamer::qGstCasts_withElement()
+{
+    QGstElement element = QGstElement::createFromFactory("identity", "myPipeline");
+    QVERIFY(element);
+
+    QVERIFY(!qIsGstObjectOfType<GstPipeline>(element.element()));
+    QVERIFY(!qIsGstObjectOfType<GstBin>(element.element()));
+}
+
+void tst_GStreamer::qGstCasts_withBin()
+{
+    QGstBin bin = QGstBin::create("bin");
+    QVERIFY(bin);
+
+    QVERIFY(!qIsGstObjectOfType<GstPipeline>(bin.element()));
+    QVERIFY(qIsGstObjectOfType<GstBin>(bin.element()));
+}
+
+void tst_GStreamer::qGstCasts_withPipeline()
+{
+    QGstPipeline pipeline = QGstPipeline::create("myPipeline");
+
+    QGstElement element{
+        qGstSafeCast<GstElement>(pipeline.pipeline()),
+        QGstElement::NeedsRef,
+    };
+
+    QVERIFY(element);
+    QVERIFY(qIsGstObjectOfType<GstPipeline>(element.element()));
+    QVERIFY(qIsGstObjectOfType<GstBin>(element.element()));
+}
+
 void tst_GStreamer::metadata_taglistToMetaData()
 {
     QGstTagListHandle tagList = parseTagList(R"(taglist, title="My Video", comment="yada")");
diff --git a/tests/auto/unit/multimedia/gstreamer_backend/tst_gstreamer_backend.h b/tests/auto/unit/multimedia/gstreamer_backend/tst_gstreamer_backend.h
index 0a1628031..7b490c22b 100644
--- a/tests/auto/unit/multimedia/gstreamer_backend/tst_gstreamer_backend.h
+++ b/tests/auto/unit/multimedia/gstreamer_backend/tst_gstreamer_backend.h
@@ -19,6 +19,10 @@ class tst_GStreamer : public QObject
     QGstTagListHandle parseTagList(const QByteArray &);
 
 private slots:
+    void qGstCasts_withElement();
+    void qGstCasts_withBin();
+    void qGstCasts_withPipeline();
+
     void metadata_taglistToMetaData();
     void metadata_taglistToMetaData_extractsOrientation();
     void metadata_taglistToMetaData_extractsOrientation_data();