Add 4th Gen input controls

src/widget-label.c

@@ -0,0 +1,23 @@
+// SPDX-FileCopyrightText: 2022 Geoffrey D. Bennett <g@b4.vu>
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "widget-label.h"
+
+static void label_updated(struct alsa_elem *elem) {
+  const char *text = alsa_get_item_name(elem, alsa_get_elem_value(elem));
+
+  gtk_label_set_text(GTK_LABEL(elem->widget), text);
+}
+
+GtkWidget *make_label_alsa_elem(struct alsa_elem *elem) {
+  GtkWidget *label = gtk_label_new(NULL);
+  gtk_widget_set_halign(label, GTK_ALIGN_CENTER);
+  gtk_widget_set_valign(label, GTK_ALIGN_CENTER);
+
+  elem->widget = label;
+  elem->widget_callback = label_updated;
+
+  label_updated(elem);
+
+  return label;
+}