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diff --git a/tinySDP/include/tinysdp/headers/tsdp_header_O.h b/tinySDP/include/tinysdp/headers/tsdp_header_O.h
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+++ b/tinySDP/include/tinysdp/headers/tsdp_header_O.h
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+/*
+* Copyright (C) 2009-2010 Mamadou Diop.
+*
+* Contact: Mamadou Diop <diopmamadou(at)doubango.org>
+*	
+* This file is part of Open Source Doubango Framework.
+*
+* DOUBANGO 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 3 of the License, or
+* (at your option) any later version.
+*	
+* DOUBANGO 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 DOUBANGO.
+*
+*/
+
+/**@file tsdp_header_O.h
+ * @brief SDP "o=" header (Origin).
+ *
+ * @author Mamadou Diop <diopmamadou(at)doubango.org>
+ *
+ * @date Created: Oat Nov 8 16:54:58 2009 mdiop
+ */
+#ifndef _TSDP_HEADER_O_H_
+#define _TSDP_HEADER_O_H_
+
+#include "tinysdp_config.h"
+#include "tinysdp/headers/tsdp_header.h"
+
+TSDP_BEGIN_DECLS
+
+
+#define TSDP_HEADER_O_VA_ARGS(username, sess_id, sess_version, nettype, addrtype, addr)			tsdp_header_O_def_t, (const char*)username, (uint32_t)sess_id, (uint32_t)sess_version, (const char*)nettype, (const char*)addrtype, (const char*)addr
+#define TSDP_HEADER_O_VA_ARGS_DEFAULT(username, nettype, addrtype, addr)						TSDP_HEADER_O_VA_ARGS(username, TSDP_HEADER_O_SESS_ID_DEFAULT, TSDP_HEADER_O_SESS_VERSION_DEFAULT, nettype, addrtype, addr)
+
+#define TSDP_HEADER_O_SESS_ID_DEFAULT		123456
+#define TSDP_HEADER_O_SESS_VERSION_DEFAULT	678901
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+/// @struct	
+///
+/// @brief	SDP "o=" header (Origin).
+///  The "o=" field gives the originator of the session (her username and
+///     the address of the user's host) plus a session identifier and version number.
+///
+/// @par ABNF : u=username SP
+/// sess-id SP sess-version SP nettype SP addrtype SP unicast-address
+///
+/// username	=  	non-ws-string 
+/// sess-id	=  	1*DIGIT
+/// sess-version	=  	1*DIGIT
+/// nettype	=  	token 
+/// addrtype	=  	token
+/// unicast-address = FQDN
+/// 	
+////////////////////////////////////////////////////////////////////////////////////////////////////
+typedef struct tsdp_header_O_s
+{	
+	TSDP_DECLARE_HEADER;
+
+	/** <username> is the user's login on the originating host, or it is "-"
+	if the originating host does not support the concept of user IDs.
+	The <username> MUST NOT contain spaces.*/
+	char* username;
+	/** <sess-id>, <nettype>, <addrtype>, and <unicast-address> forms a
+	globally unique identifier for the session.  The method of
+	<sess-id> allocation is up to the creating tool, but it has been
+	suggested that a Network Time Protocol (NTP) format timestamp be
+	used to ensure uniqueness*/
+	uint32_t sess_id;
+	/** <sess-version> is a version number for this session description.  Its
+	usage is up to the creating tool, so long as <sess-version> is
+	increased when a modification is made to the session data.  Again,
+	it is RECOMMENDED that an NTP format timestamp is used.*/
+	uint32_t sess_version;
+	/** <nettype> is a text string giving the type of network.  Initially
+	"IN" is defined to have the meaning "Internet", but other values
+	MAY be registered in the future (see Section 8 of RFC 4566)*/
+	char* nettype;
+	/**<addrtype> is a text string giving the type of the address that
+	follows.  Initially "IP4" and "IP6" are defined, but other values
+	MAY be registered in the future (see Section 8 of RFC 4566)*/
+	char* addrtype;
+	/** <unicast-address> is the address of the machine from which the
+	session was created.  For an address type of IP4, this is either
+	the fully qualified domain name of the machine or the dotted-
+	decimal representation of the IP version 4 address of the machine.
+	For an address type of IP6, this is either the fully qualified
+	domain name of the machine or the compressed textual
+	representation of the IP version 6 address of the machine.  For
+	both IP4 and IP6, the fully qualified domain name is the form that
+	SHOULD be given unless this is unavailable, in which case the
+	globally unique address MAY be substituted.  A local IP address
+	MUST NOT be used in any context where the SDP description might
+	leave the scope in which the address is meaningful (for example, a
+	local address MUST NOT be included in an application-level
+	referral that might leave the scope)*/
+	char* addr;
+}
+tsdp_header_O_t;
+
+TINYSDP_API tsdp_header_O_t* tsdp_header_O_create(const char* username, uint32_t sess_id, uint32_t sess_version, const char* nettype, const char* addrtype, const char* addr);
+TINYSDP_API tsdp_header_O_t* tsdp_header_O_create_null();
+TINYSDP_API tsdp_header_O_t* tsdp_header_O_create_default(const char* username, const char* nettype, const char* addrtype, const char* addr);
+
+TINYSDP_API tsdp_header_O_t *tsdp_header_O_parse(const char *data, tsk_size_t size);
+
+TINYSDP_GEXTERN const tsk_object_def_t *tsdp_header_O_def_t;
+
+TSDP_END_DECLS
+
+#endif /* _TSDP_HEADER_O_H_ */
+