Add custom debug script with Gst version check

clapper_src/debug.js

@@ -0,0 +1,33 @@
+const { GLib, Gst } = imports.gi;
+
+const GST_VERSION = Gst.version();
+const REQ_GST_VER_MINOR = 16;
+
+function debug(msg, levelName)
+{
+    levelName = levelName || 'LEVEL_DEBUG';
+
+    if(msg instanceof Error) {
+        levelName = 'LEVEL_CRITICAL';
+        msg = msg.message;
+    }
+    GLib.log_structured(
+        'Clapper', GLib.LogLevelFlags[levelName], {
+            MESSAGE: msg,
+            SYSLOG_IDENTIFIER: 'clapper'
+    });
+}
+
+function gstVersionCheck()
+{
+    if(GST_VERSION[1] >= REQ_GST_VER_MINOR)
+        return;
+
+    debug(
+        'clapper interface was designed to' +
+        ` work with GStreamer 1.${REQ_GST_VER_MINOR} or later.` +
+        ` Your version is ${GST_VERSION[0]}.${GST_VERSION[1]}.` +
+        ' Please update GStreamer or expect some things to be broken.',
+        'LEVEL_WARNING'
+    );
+}