Elements: BinBase: initial implementation

BaseBin - base class for Gstreamer elelemts used in app.
It uses GstBin as base class and has src/sink static pad templates.

Signed-off-by: Vasiliy Doylov <nekocwd@mainlining.org>

src/elements/bin_base.vala

@@ -0,0 +1,48 @@
+/* bin_base.vala
+ *
+ * Copyright 2025 Vasiliy Doylov <nekocwd@mainlining.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+public class EyeNeko.Elements.BinBase : Gst.Bin {
+    protected Gst.Pad sinkpad;
+    protected Gst.Pad srcpad;
+
+    static construct {
+        add_static_pad_template(
+        {
+            "sink",
+            Gst.PadDirection.SINK,
+            Gst.PadPresence.ALWAYS,
+            { null, "video/x-raw" }
+        });
+        add_static_pad_template(
+        {
+            "src",
+            Gst.PadDirection.SRC,
+            Gst.PadPresence.ALWAYS,
+            { null, "video/x-raw" }
+        });
+    }
+
+    protected void add_pads(Gst.Element sink, Gst.Element src) {
+        sinkpad = new Gst.GhostPad("sink", sink.get_static_pad("sink"));
+        add_pad(sinkpad);
+        srcpad = new Gst.GhostPad("src", src.get_static_pad("src"));
+        add_pad(srcpad);
+    }
+}

src/meson.build

@@ -9,6 +9,7 @@ eyeneko_sources = [
   'logic/color_correction_filter.vala',
   'logic/filter.vala',
   'logic/helpers.vala',
+  'elements/bin_base.vala',
   'elements/downscale.vala',
   'elements/focus_analyze.vala',
 ]