iMX: Introduce QT_GSTREAMER_PLAYBIN_CONVERT to inject a converter in playbin

Injects a converter between decoders and video sink.

Task-number: QTBUG-76179
Change-Id: If5fc8090bc1ade424a1157e94d83dc5a51051fd7
Reviewed-by: Samuli Piippo <samuli.piippo@qt.io>
(cherry picked from commit 92658f152656f6d8373e79be0b2bfe331857560a)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

1 files changed, 9 insertions, 1 deletions

diff --git a/src/gsttools/qgstreamerplayersession.cpp b/src/gsttools/qgstreamerplayersession.cpp
index f7f3b7ca1..adf11b022 100644
--- a/src/gsttools/qgstreamerplayersession.cpp
+++ b/src/gsttools/qgstreamerplayersession.cpp
@@ -162,7 +162,15 @@ void QGstreamerPlayerSession::initPlaybin()
     }
 
 #if GST_CHECK_VERSION(1,0,0)
-    m_videoIdentity = gst_element_factory_make("identity", nullptr); // floating ref
+    static const auto convDesc = qEnvironmentVariable("QT_GSTREAMER_PLAYBIN_CONVERT");
+    GError *err = nullptr;
+    auto convPipeline = !convDesc.isEmpty() ? convDesc.toLatin1().constData() : "identity";
+    auto convElement = gst_parse_launch(convPipeline, &err);
+    if (err) {
+        qWarning() << "Error:" << convDesc << ":" << QLatin1String(err->message);
+        g_clear_error(&err);
+    }
+    m_videoIdentity = convElement;
 #else
     m_videoIdentity = GST_ELEMENT(g_object_new(gst_video_connector_get_type(), 0)); // floating ref
     g_signal_connect(G_OBJECT(m_videoIdentity), "connection-failed", G_CALLBACK(insertColorSpaceElement), (gpointer)this);