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diff --git a/pjmedia/include/pjmedia/bidirectional.h b/pjmedia/include/pjmedia/bidirectional.h
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+++ b/pjmedia/include/pjmedia/bidirectional.h
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+/* $Id: bidirectional.h 3553 2011-05-05 06:14:19Z nanang $ */
+/* 
+ * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
+ * Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
+ */
+#ifndef __PJMEDIA_BIDIRECTIONAL_H__
+#define __PJMEDIA_BIDIRECTIONAL_H__
+
+/**
+ * @file bidirectional.h
+ * @brief Bidirectional media port.
+ */
+#include <pjmedia/port.h>
+
+
+/**
+ * @defgroup PJMEDIA_BIDIRECTIONAL_PORT Bidirectional Port
+ * @ingroup PJMEDIA_PORT
+ * @brief A bidirectional port combines two unidirectional ports into one
+ * bidirectional port
+ * @{
+ */
+
+
+PJ_BEGIN_DECL
+
+
+/**
+ * Create bidirectional port from two unidirectional ports
+ *
+ * @param pool		Pool to allocate memory.
+ * @param get_port	Port where get_frame() will be directed to.
+ * @param put_port	Port where put_frame() will be directed to.
+ * @param p_port	Pointer to receive the port instance.
+ *
+ * @return		PJ_SUCCESS on success.
+ */
+PJ_DECL(pj_status_t) pjmedia_bidirectional_port_create(pj_pool_t *pool,
+						       pjmedia_port *get_port,
+						       pjmedia_port *put_port,
+						       pjmedia_port **p_port );
+
+
+
+PJ_END_DECL
+
+/**
+ * @}
+ */
+
+
+#endif	/* __PJMEDIA_BIDIRECTIONAL_H__ */
+