Gstreamer: add support for ksvideosrc within camerabin

Task-number: QTBUG-72125
Change-Id: I12bc684a796c6abb6af3a51edca52011495f4ac9
Reviewed-by: Christian Stromme <christian.stromme@qt.io>

2 files changed, 54 insertions, 2 deletions

diff --git a/src/gsttools/qgstutils.cpp b/src/gsttools/qgstutils.cpp
index 6960ff8f4..f38ade75f 100644
--- a/src/gsttools/qgstutils.cpp
+++ b/src/gsttools/qgstutils.cpp
@@ -685,6 +685,51 @@ QVector<QGstUtils::CameraInfo> QGstUtils::enumerateCameras(GstElementFactory *fa
     camerasCacheAgeTimer.restart();
 #endif // linux_v4l
 
+#if defined(Q_OS_WIN) && GST_CHECK_VERSION(1,4,0)
+    QGstUtils::initializeGst();
+    GstDeviceMonitor *monitor = gst_device_monitor_new();
+    auto caps = gst_caps_new_empty_simple("video/x-raw");
+    gst_device_monitor_add_filter(monitor, "Video/Source", caps);
+    gst_caps_unref(caps);
+
+    GList *devs = gst_device_monitor_get_devices(monitor);
+    while (devs) {
+        GstDevice *dev = reinterpret_cast<GstDevice*>(devs->data);
+        gchar *name = gst_device_get_display_name(dev);
+        gchar *desc = nullptr;
+
+        GstElement *element = gst_device_create_element(dev, nullptr);
+        if (element) {
+            GParamSpec *prop = g_object_class_find_property(G_OBJECT_GET_CLASS(element), "device-path");
+            if (prop) {
+                GValue value = G_VALUE_INIT;
+                g_value_init(&value, prop->value_type);
+                g_object_get_property(G_OBJECT(element), prop->name, &value);
+                desc = g_value_dup_string(&value);
+                g_value_unset(&value);
+
+                CameraInfo device = {
+                    desc,
+                    name,
+                    0,
+                    QCamera::UnspecifiedPosition,
+                    QByteArray()
+                };
+
+                devices.append(device);
+            }
+
+            gst_object_unref(element);
+        }
+
+        g_free(desc);
+        g_free(name);
+        gst_object_unref(dev);
+        devs = g_list_delete_link(devs, devs);
+    }
+    gst_object_unref(monitor);
+#endif // #if defined(Q_OS_WIN) && GST_CHECK_VERSION(1,4,0)
+
     return devices;
 }
 
diff --git a/src/plugins/gstreamer/camerabin/camerabinsession.cpp b/src/plugins/gstreamer/camerabin/camerabinsession.cpp
index ebb797189..f4559de81 100644
--- a/src/plugins/gstreamer/camerabin/camerabinsession.cpp
+++ b/src/plugins/gstreamer/camerabin/camerabinsession.cpp
@@ -541,13 +541,20 @@ GstElement *CameraBinSession::buildCameraSource()
                 if (!m_videoSrc)
                     m_videoSrc = gst_element_factory_make("v4l2src", "camera_source");
 
+                if (!m_videoSrc)
+                    m_videoSrc = gst_element_factory_make("ksvideosrc", "camera_source");
+
                 if (m_videoSrc)
                     g_object_set(G_OBJECT(m_cameraSrc), "video-source", m_videoSrc, NULL);
             }
 
-            if (m_videoSrc)
-                g_object_set(G_OBJECT(m_videoSrc), "device", m_inputDevice.toUtf8().constData(), NULL);
+            if (m_videoSrc) {
+                if (g_object_class_find_property(G_OBJECT_GET_CLASS(m_videoSrc), "device"))
+                    g_object_set(G_OBJECT(m_videoSrc), "device", m_inputDevice.toUtf8().constData(), NULL);
 
+                if (g_object_class_find_property(G_OBJECT_GET_CLASS(m_videoSrc), "device-path"))
+                    g_object_set(G_OBJECT(m_videoSrc), "device-path", m_inputDevice.toUtf8().constData(), NULL);
+            }
         } else if (g_object_class_find_property(G_OBJECT_GET_CLASS(m_cameraSrc), "camera-device")) {
             if (m_inputDevice == QLatin1String("secondary")) {
                 g_object_set(G_OBJECT(m_cameraSrc), "camera-device", 1, NULL);