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diff --git a/gst/alpha/gstalpha.h b/gst/alpha/gstalpha.h
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+/* GStreamer
+ * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
+ * Copyright (C) <2007> Wim Taymans <wim.taymans@collabora.co.uk>
+ * Copyright (C) <2007> Edward Hervey <edward.hervey@collabora.co.uk>
+ * Copyright (C) <2007> Jan Schmidt <thaytan@noraisin.net>
+ *
+ * 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., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __GST_ALPHA_H__
+#define __GST_ALPHA_H__
+
+#include <gst/gst.h>
+#include <gst/video/video.h>
+#include <gst/video/gstvideofilter.h>
+
+G_BEGIN_DECLS
+
+#define GST_TYPE_ALPHA \
+  (gst_alpha_get_type())
+#define GST_ALPHA(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_ALPHA,GstAlpha))
+#define GST_ALPHA_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_ALPHA,GstAlphaClass))
+#define GST_IS_ALPHA(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_ALPHA))
+#define GST_IS_ALPHA_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_ALPHA))
+
+typedef struct _GstAlpha GstAlpha;
+typedef struct _GstAlphaClass GstAlphaClass;
+
+/** 
+ * GstAlphaMethod:
+ * @ALPHA_METHOD_SET: Set/adjust alpha channel
+ * @ALPHA_METHOD_GREEN: Chroma Key green
+ * @ALPHA_METHOD_BLUE: Chroma Key blue
+ * @ALPHA_METHOD_CUSTOM: Chroma Key on target_r/g/b
+ */
+typedef enum
+{
+  ALPHA_METHOD_SET,
+  ALPHA_METHOD_GREEN,
+  ALPHA_METHOD_BLUE,
+  ALPHA_METHOD_CUSTOM,
+}
+GstAlphaMethod;
+
+GST_DEBUG_CATEGORY_STATIC (gst_alpha_debug);
+#define GST_CAT_DEFAULT gst_alpha_debug
+
+struct _GstAlpha
+{
+  GstVideoFilter parent;
+
+  /* <private> */
+
+  /* caps */
+  GMutex lock;
+
+  gboolean in_sdtv, out_sdtv;
+
+  /* properties */
+  gdouble alpha;
+
+  guint target_r;
+  guint target_g;
+  guint target_b;
+
+  GstAlphaMethod method;
+
+  gfloat angle;
+  gfloat noise_level;
+  guint black_sensitivity;
+  guint white_sensitivity;
+
+  gboolean prefer_passthrough;
+
+  /* processing function */
+  void (*process) (const GstVideoFrame *in_frame, GstVideoFrame *out_frame, GstAlpha *alpha);
+
+  /* precalculated values for chroma keying */
+  gint8 cb, cr;
+  gint8 kg;
+  guint8 accept_angle_tg;
+  guint8 accept_angle_ctg;
+  guint8 one_over_kc;
+  guint8 kfgy_scale;
+  guint noise_level2;
+};
+
+struct _GstAlphaClass
+{
+  GstVideoFilterClass parent_class;
+};
+
+GType gst_alpha_get_type (void);
+
+G_END_DECLS
+
+#endif /* __GST_ALPHA_H__ */