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diff --git a/pjmedia/include/pjmedia-codec/passthrough.h b/pjmedia/include/pjmedia-codec/passthrough.h
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+/* $Id$ */
+/* 
+ * Copyright (C) 2008-2009 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_CODECS_PASSTHROUGH_H__
+#define __PJMEDIA_CODECS_PASSTHROUGH_H__
+
+/**
+ * @file pjmedia-codec/passthrough.h
+ * @brief Passthrough codecs.
+ */
+
+#include <pjmedia-codec/types.h>
+
+/**
+ * @defgroup PJMED_PASSTHROUGH_CODEC Passthrough Codecs
+ * @ingroup PJMEDIA_CODEC
+ * @brief Implementation of passthrough codecs
+ * @{
+ *
+ * This section describes functions to register and register passthrough 
+ * codecs factory to the codec manager. After the codec factory has been 
+ * registered, application can use @ref PJMEDIA_CODEC API to manipulate 
+ * the codec. This codec factory contains various codecs, e.g: G.729, iLBC,
+ * AMR, and G.711.
+ *
+ * Passthrough codecs are codecs wrapper that does not perform encoding 
+ * or decoding, it just pack and parse encoded audio data from/into RTP 
+ * payload. This will accomodate pjmedia ports which work with encoded
+ * audio data, e.g: encoded audio files, sound device with capability
+ * of playing/recording encoded audio data.
+ */
+
+PJ_BEGIN_DECL
+
+/**
+ * Initialize and register passthrough codecs factory to pjmedia endpoint.
+ *
+ * @param endpt	    The pjmedia endpoint.
+ *
+ * @return	    PJ_SUCCESS on success.
+ */
+PJ_DECL(pj_status_t) pjmedia_codec_passthrough_init( pjmedia_endpt *endpt );
+
+
+
+/**
+ * Unregister passthrough codecs factory from pjmedia endpoint.
+ *
+ * @return	    PJ_SUCCESS on success.
+ */
+PJ_DECL(pj_status_t) pjmedia_codec_passthrough_deinit(void);
+
+
+PJ_END_DECL
+
+
+/**
+ * @}
+ */
+
+#endif	/* __PJMEDIA_CODECS_PASSTHROUGH_H__ */
+