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!

3 files changed, 146 insertions, 0 deletions

diff --git a/gst-libs/gst/xoverlay/Makefile.am b/gst-libs/gst/xoverlay/Makefile.am
new file mode 100644
index 00000000..184d505f
--- /dev/null
+++ b/gst-libs/gst/xoverlay/Makefile.am
@@ -0,0 +1,11 @@
+libgstinterfacesincludedir = \
+	$(includedir)/gstreamer-@GST_MAJORMINOR@/gst/xoverlay
+
+libgstinterfacesinclude_HEADERS = xoverlay.h
+
+lib_LTLIBRARIES = libgstxoverlay.la
+
+libgstxoverlay_la_SOURCES = xoverlay.c
+libgstxoverlay_la_LIBADD = 
+libgstxoverlay_la_CFLAGS = $(GST_CFLAGS) $(GST_OPT_CFLAGS)
+libgstxoverlay_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
diff --git a/gst-libs/gst/xoverlay/xoverlay.c b/gst-libs/gst/xoverlay/xoverlay.c
new file mode 100644
index 00000000..f0b4ebb5
--- /dev/null
+++ b/gst-libs/gst/xoverlay/xoverlay.c
@@ -0,0 +1,74 @@
+/* GStreamer X-based Overlay
+ * Copyright (C) 2003 Ronald Bultje <rbultje@ronald.bitfreak.net>
+ *
+ * tv-mixer.c: tv-mixer 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 "xoverlay.h"
+
+static void 	gst_x_overlay_class_init	(GstXOverlayClass *klass);
+
+GType
+gst_x_overlay_get_type (void)
+{
+  static GType gst_x_overlay_type = 0;
+
+  if (!gst_x_overlay_type) {
+    static const GTypeInfo gst_x_overlay_info = {
+      sizeof (GstXOverlayClass),
+      (GBaseInitFunc) gst_x_overlay_class_init,
+      NULL,
+      NULL,
+      NULL,
+      NULL,
+      0,
+      0,
+      NULL,
+    };
+
+    gst_x_overlay_type = g_type_register_static (G_TYPE_INTERFACE,
+						 "GstXOverlay",
+						 &gst_x_overlay_info, 0);
+    g_type_interface_add_prerequisite (gst_x_overlay_type,
+				       GST_TYPE_INTERFACE);
+  }
+
+  return gst_x_overlay_type;
+}
+
+static void
+gst_x_overlay_class_init (GstXOverlayClass *klass)
+{
+  /* default virtual functions */
+  klass->set_xwindow_id = NULL;
+}
+
+void
+gst_x_overlay_set_xwindow_id (GstXOverlay *overlay,
+			      XID          xwindow_id)
+{
+  GstXOverlayClass *klass = GST_X_OVERLAY_GET_CLASS (overlay);
+
+  if (klass->set_xwindow_id) {
+    klass->set_xwindow_id (overlay, xwindow_id);
+  }
+}
diff --git a/gst-libs/gst/xoverlay/xoverlay.h b/gst-libs/gst/xoverlay/xoverlay.h
new file mode 100644
index 00000000..15258765
--- /dev/null
+++ b/gst-libs/gst/xoverlay/xoverlay.h
@@ -0,0 +1,61 @@
+/* GStreamer X-based Overlay
+ * Copyright (C) 2003 Ronald Bultje <rbultje@ronald.bitfreak.net>
+ *
+ * x-overlay.h: X-based overlay interface design
+ *
+ * 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.
+ */
+
+#ifndef __GST_X_OVERLAY_H__
+#define __GST_X_OVERLAY_H__
+
+#include <gst/gst.h>
+#include <X11/Xlib.h>
+
+G_BEGIN_DECLS
+
+#define GST_TYPE_X_OVERLAY \
+  (gst_x_overlay_get_type ())
+#define GST_X_OVERLAY(obj) \
+  (GST_INTERFACE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_X_OVERLAY, GstXOverlay))
+#define GST_X_OVERLAY_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_X_OVERLAY, GstXOverlayClass))
+#define GST_IS_X_OVERLAY(obj) \
+  (GST_INTERFACE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_X_OVERLAY))
+#define GST_IS_X_OVERLAY_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_X_OVERLAY))
+#define GST_X_OVERLAY_GET_CLASS(inst) \
+  (G_TYPE_INSTANCE_GET_INTERFACE ((inst), GST_TYPE_X_OVERLAY, GstXOverlayClass))
+
+typedef struct _GstXOverlay GstXOverlay;
+
+typedef struct _GstXOverlayClass {
+  GTypeInterface klass;
+
+  /* virtual functions */
+  void (* set_xwindow_id) (GstXOverlay *overlay,
+			   XID          xwindow_id);
+} GstXOverlayClass;
+
+GType	gst_x_overlay_get_type		(void);
+
+/* virtual class function wrappers */
+void	gst_x_overlay_set_xwindow_id	(GstXOverlay *overlay,
+					 XID          xwindow_id);
+
+G_END_DECLS
+
+#endif /* __GST_X_OVERLAY_H__ */