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diff --git a/ext/amrnb/amrnbdec.h b/ext/amrnb/amrnbdec.h
new file mode 100644
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+++ b/ext/amrnb/amrnbdec.h
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+/* GStreamer Adaptive Multi-Rate Narrow-Band (AMR-NB) plugin
+ * Copyright (C) 2004 Ronald Bultje <rbultje@ronald.bitfreak.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_AMRNBDEC_H__
+#define __GST_AMRNBDEC_H__
+
+#include <gst/gst.h>
+#include <gst/audio/gstaudiodecoder.h>
+
+#ifdef HAVE_OPENCORE_AMRNB_0_1_3_OR_LATER
+#include <opencore-amrnb/interf_dec.h>
+#else
+#include <interf_dec.h>
+#endif
+
+G_BEGIN_DECLS
+
+#define GST_TYPE_AMRNBDEC \
+  (gst_amrnbdec_get_type())
+#define GST_AMRNBDEC(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST((obj), GST_TYPE_AMRNBDEC, GstAmrnbDec))
+#define GST_AMRNBDEC_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST((klass), GST_TYPE_AMRNBDEC, GstAmrnbDecClass))
+#define GST_IS_AMRNBDEC(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE((obj), GST_TYPE_AMRNBDEC))
+#define GST_IS_AMRNBDEC_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_TYPE((klass), GST_TYPE_AMRNBDEC))
+
+typedef struct _GstAmrnbDec GstAmrnbDec;
+typedef struct _GstAmrnbDecClass GstAmrnbDecClass;
+
+typedef enum
+{
+  GST_AMRNB_VARIANT_IF1,
+  GST_AMRNB_VARIANT_IF2
+} GstAmrnbVariant;
+
+struct _GstAmrnbDec {
+  GstAudioDecoder element;
+
+  GstAmrnbVariant variant;
+
+  /* library handle */
+  void *handle;
+
+  /* output settings */
+  gint channels, rate;
+};
+
+struct _GstAmrnbDecClass {
+  GstAudioDecoderClass parent_class;
+};
+
+GType gst_amrnbdec_get_type (void);
+
+G_END_DECLS
+
+#endif /* __GST_AMRNBDEC_H__ */