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diff --git a/gst/passthrough/gstpassthrough.h b/gst/passthrough/gstpassthrough.h
new file mode 100644
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+++ b/gst/passthrough/gstpassthrough.h
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+/* -*- c-basic-offset: 2 -*-
+ * GStreamer
+ * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
+ *
+ * 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_PASSTHROUGH_H__
+#define __GST_PASSTHROUGH_H__
+
+
+#include <config.h>
+#include <gst/gst.h>
+// #include <gst/meta/audioraw.h>
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+
+#define GST_TYPE_PASSTHROUGH \
+  (gst_passthrough_get_type())
+#define GST_PASSTHROUGH(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_PASSTHROUGH,GstPassthrough))
+#define GST_PASSTHROUGH_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_ULAW,GstPassthrough))
+#define GST_IS_PASSTHROUGH(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_PASSTHROUGH))
+#define GST_IS_PASSTHROUGH_CLASS(obj) \
+  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_PASSTHROUGH))
+
+typedef struct _GstPassthrough GstPassthrough;
+typedef struct _GstPassthroughClass GstPassthroughClass;
+typedef enum _GstPassthroughFormat GstPassthroughFormat;
+
+enum _GstPassthroughFormat {
+  GST_PASSTHROUGH_FORMAT_INT,
+  GST_PASSTHROUGH_FORMAT_FLOAT
+};
+
+struct _GstPassthrough {
+  GstElement element;
+
+  GstPad *sinkpad, *srcpad;
+
+  gboolean silent;
+  
+  /* the next three are valid for both int and float */
+  
+  GstPassthroughFormat format;
+  
+  guint rate;
+  
+  guint channels;
+  
+  /* the next five are valid only for format==GST_PASSTHROUGH_FORMAT_INT */
+  
+  guint width;
+  
+  guint depth;
+
+  guint endianness;
+  
+  guint law;
+  
+  gboolean is_signed;
+  
+  /* the next three are valid only for format==GST_PASSTHROUGH_FORMAT_FLOAT */
+  
+  const gchar *layout;
+  
+  gfloat slope;
+  
+  gfloat intercept;
+};
+
+struct _GstPassthroughClass {
+  GstElementClass parent_class;
+};
+
+GType gst_passthrough_get_type(void);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+
+#endif /* __GST_PASSTHROUGH_H__ */