Some interface implementations for video4linux/video4linux2 plugins: a Tuner interface, with which one can select inp...

Original commit message from CVS:
Some interface implementations for video4linux/video4linux2 plugins:
* a Tuner interface, with which one can select inputs and stations. Audio
work is underway here, but unfinished.
* A Xoverlay interface with which one can do simple overlay. Similar to
the API of the v4l/Xv XFree86 extension. Widget implementation for
GTK-2.0 coming up in the sandbox.
* Colorbalance - for adapting colors (brightness, contrast, etc.) - pretty
basic and maybe somewhat overdesigned. But it'll do for now.

Apart from these interfaces, there's also a loadable library 'xwindowlistener'
that listenes to X for the movement of a window and the overlap of other
windows. This is partly copied from xawtv (and thus partly GPL :(), but it's
needed for the xoverlay interface implementation in the v4l/v4l2 elements.

Lastly, some small changes to remove redundant properties from the v4l/v4l2
elements since these can be done much simpler. Comments appreciated!

1 files changed, 103 insertions, 0 deletions

diff --git a/gst-libs/gst/colorbalance/colorbalance.c b/gst-libs/gst/colorbalance/colorbalance.c
new file mode 100644
index 00000000..829cf5f6
--- /dev/null
+++ b/gst-libs/gst/colorbalance/colorbalance.c
@@ -0,0 +1,103 @@
+/* GStreamer Color Balance
+ * Copyright (C) 2003 Ronald Bultje <rbultje@ronald.bitfreak.net>
+ *
+ * colorbalance.c: image color balance interface design
+ *		   virtual class function wrappers
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "colorbalance.h"
+
+static void 	gst_color_balance_class_init	(GstColorBalanceClass *klass);
+
+GType
+gst_color_balance_get_type (void)
+{
+  static GType gst_color_balance_type = 0;
+
+  if (!gst_color_balance_type) {
+    static const GTypeInfo gst_color_balance_info = {
+      sizeof (GstColorBalanceClass),
+      (GBaseInitFunc) gst_color_balance_class_init,
+      NULL,
+      NULL,
+      NULL,
+      NULL,
+      0,
+      0,
+      NULL,
+    };
+
+    gst_color_balance_type = g_type_register_static (G_TYPE_INTERFACE,
+						     "GstColorBalance",
+						     &gst_color_balance_info, 0);
+    g_type_interface_add_prerequisite (gst_color_balance_type,
+				       GST_TYPE_INTERFACE);
+  }
+
+  return gst_color_balance_type;
+}
+
+static void
+gst_color_balance_class_init (GstColorBalanceClass *klass)
+{
+  /* default virtual functions */
+  klass->list_channels = NULL;
+  klass->set_value = NULL;
+  klass->get_value = NULL;
+}
+
+const GList *
+gst_color_balance_list_channels	(GstColorBalance *balance)
+{
+  GstColorBalanceClass *klass = GST_COLOR_BALANCE_GET_CLASS (balance);
+
+  if (klass->list_channels) {
+    return klass->list_channels (balance);
+  }
+
+  return NULL;
+}
+
+void
+gst_color_balance_set_value (GstColorBalance        *balance,
+			     GstColorBalanceChannel *channel,
+			     gint                    value)
+{
+  GstColorBalanceClass *klass = GST_COLOR_BALANCE_GET_CLASS (balance);
+
+  if (klass->set_value) {
+    klass->set_value (balance, channel, value);
+  }
+}
+
+gint
+gst_color_balance_get_value (GstColorBalance        *balance,
+			     GstColorBalanceChannel *channel)
+{
+  GstColorBalanceClass *klass = GST_COLOR_BALANCE_GET_CLASS (balance);
+
+  if (klass->get_value) {
+    return klass->get_value (balance, channel);
+  }
+
+  return channel->min_value;
+}