package/gstreamer1/gst1-plugins-good: Enable GUDEV for V4L2 if available

Video4Linux2 plugins can udev for device probing and monitor.
This greatly improves load time and monitoring performance.

It also enables hotplug monitoring for cameras.

gstreamer is libglib2-based; libgudev is libnglib2-based. So they both
have the same basic dependencies as liblib2 has, and thus propagating
the dependencies of libgudev is not necessary (but might be confusing in
the future, even though such a change is highly unlikely...)

Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/gstreamer1/gst1-plugins-good/Config.in

@@ -295,6 +295,7 @@ config BR2_PACKAGE_GST1_PLUGINS_GOOD_PLUGIN_SHOUT2
 config BR2_PACKAGE_GST1_PLUGINS_GOOD_PLUGIN_V4L2
 	bool "v4l2"
 	depends on BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_0 # multi planar api
+	select BR2_PACKAGE_LIBGUDEV if BR2_PACKAGE_HAS_UDEV
 	help
 	  elements for Video 4 Linux
 

package/gstreamer1/gst1-plugins-good/gst1-plugins-good.mk

@@ -354,6 +354,13 @@ endif
 
 ifeq ($(BR2_PACKAGE_GST1_PLUGINS_GOOD_PLUGIN_V4L2),y)
 GST1_PLUGINS_GOOD_CONF_OPTS += -Dv4l2=enabled
+# Enable use of gudev if available, for device probing and monitoring.
+ifeq ($(BR2_PACKAGE_LIBGUDEV),y)
+GST1_PLUGINS_GOOD_DEPENDENCIES += libgudev
+GST1_PLUGINS_GOOD_CONF_OPTS += -Dv4l2-gudev=enabled
+else
+GST1_PLUGINS_GOOD_CONF_OPTS += -Dv4l2-gudev=disabled
+endif
 else
 GST1_PLUGINS_GOOD_CONF_OPTS += -Dv4l2=disabled
 endif