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diff --git a/gst/monoscope/gstmonoscope.h b/gst/monoscope/gstmonoscope.h
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+++ b/gst/monoscope/gstmonoscope.h
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+/* GStreamer monoscope visualisation element
+ * Copyright (C) <2002> Richard Boulton <richard@tartarus.org>
+ * Copyright (C) <2006> Tim-Philipp Müller <tim centricular net>
+ * Copyright (C) <2006> Wim Taymans <wim at fluendo dot com>
+ *
+ * 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_MONOSCOPE__
+#define __GST_MONOSCOPE__
+
+G_BEGIN_DECLS
+
+#include <gst/gst.h>
+#include <gst/base/gstadapter.h>
+
+#define GST_TYPE_MONOSCOPE            (gst_monoscope_get_type())
+#define GST_MONOSCOPE(obj)            (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_MONOSCOPE,GstMonoscope))
+#define GST_MONOSCOPE_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_MONOSCOPE,GstMonoscopeClass))
+#define GST_IS_MONOSCOPE(obj)         (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_MONOSCOPE))
+#define GST_IS_MONOSCOPE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_MONOSCOPE))
+
+typedef struct _GstMonoscope GstMonoscope;
+typedef struct _GstMonoscopeClass GstMonoscopeClass;
+
+struct _GstMonoscope
+{
+  GstElement element;
+
+  /* pads */
+  GstPad      *sinkpad;
+  GstPad      *srcpad;
+
+  GstAdapter  *adapter;
+
+  guint64      next_ts;             /* expected timestamp of the next frame */
+  guint64      frame_duration;      /* video frame duration    */
+  gint         rate;                /* sample rate             */
+  guint        bps;                 /* bytes per sample        */
+  guint        spf;                 /* samples per video frame */
+
+  GstSegment   segment;
+
+  /* QoS stuff *//* with LOCK */
+  gdouble      proportion;
+  GstClockTime earliest_time;
+
+  /* video state */
+  gint         fps_num;
+  gint         fps_denom;
+  gint         width;
+  gint         height;
+  guint        outsize;
+
+  /* visualisation state */
+  struct monoscope_state *visstate;
+};
+
+struct _GstMonoscopeClass
+{
+  GstElementClass parent_class;
+};
+
+G_END_DECLS
+
+#endif /* __GST_MONOSCOPE__ */
+