Add custom debug script with Gst version check

clapper_src/app.js

@@ -1,10 +1,13 @@
 const { Gdk, GLib, GObject, Gtk } = imports.gi;
+const Debug = imports.clapper_src.debug;
 const { Interface } = imports.clapper_src.interface;
 const { Player } = imports.clapper_src.player;
 const { Window } = imports.clapper_src.window;
 
 const APP_NAME = 'Clapper';
 
+let { debug } = Debug;
+
 var App = GObject.registerClass({
     Signals: {
         'ready': {
@@ -306,11 +309,11 @@ var App = GObject.registerClass({
 
     _onPlayerWarning(self, error)
     {
-        log(error.message);
+        debug(error.message, 'LEVEL_WARNING');
     }
 
     _onPlayerError(self, error)
     {
-        logError(error);
+        debug(error);
     }
 });

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'
+    );
+}

clapper_src/interface.js

@@ -1,11 +1,16 @@
-const { GObject, Gtk, GstPlayer } = imports.gi;
+const { GObject, Gtk, Gst, GstPlayer } = imports.gi;
 const { Controls } = imports.clapper_src.controls;
+const Debug = imports.clapper_src.debug;
+
+let { debug } = Debug;
 
 var Interface = GObject.registerClass(
 class ClapperInterface extends Gtk.Grid
 {
     _init(opts)
     {
+        Debug.gstVersionCheck();
+
         super._init();
 
         let defaults = {