1 /*
2  * Copyright (C) 2010-2011 Raphael Coeffic
3  *
4  * This file is part of SEMS, a free SIP media server.
5  *
6  * SEMS is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or
9  * (at your option) any later version. This program is released under
10  * the GPL with the additional exemption that compiling, linking,
11  * and/or using OpenSSL is allowed.
12  *
13  * For a license to use the SEMS software under conditions
14  * other than those described here, or to purchase support for this
15  * software, please contact iptel.org by e-mail at the following addresses:
16  *    info@iptel.org
17  *
18  * SEMS is distributed in the hope that it will be useful,
19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
21  * GNU General Public License for more details.
22  *
23  * You should have received a copy of the GNU General Public License
24  * along with this program; if not, write to the Free Software
25  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
26  */
27 /** @file AmOfferAnswer.h */
28 #ifndef AmOfferAnswer_h
29 #define AmOfferAnswer_h
30 
31 #include "AmSdp.h"
32 #include "AmSipMsg.h"
33 
34 class AmSipDialog;
35 
36 class AmOfferAnswer
37 {
38 public:
39   enum OAState {
40     OA_None=0,
41     OA_OfferRecved,
42     OA_OfferSent,
43     OA_Completed,
44     __max_OA
45   };
46 
47 private:
48   OAState      state;
49   OAState      saved_state;
50   unsigned int cseq;
51   AmSdp        sdp_remote;
52   AmSdp        sdp_local;
53 
54   AmSipDialog* dlg;
55 
56   /** State maintenance */
57   void saveState();
58   int  checkStateChange();
59 
60   /** SDP handling */
61   int  onRxSdp(unsigned int m_cseq, const AmMimeBody& body, const char** err_txt);
62   int  onTxSdp(unsigned int m_cseq, const AmMimeBody& body);
63   int  getSdpBody(string& sdp_body);
64 
65 public:
66   /** Constructor */
67   AmOfferAnswer(AmSipDialog* dlg);
68 
69   /** Accessors */
70   OAState getState();
71   void setState(OAState n_st);
72   const AmSdp& getLocalSdp();
73   const AmSdp& getRemoteSdp();
74 
75   void clear();
76   void clearTransitionalState();
77 
78   /** Event handlers */
79   int onRequestIn(const AmSipRequest& req);
80   int onReplyIn(const AmSipReply& reply);
81   int onRequestOut(AmSipRequest& req);
82   int onReplyOut(AmSipReply& reply);
83   int onRequestSent(const AmSipRequest& req);
84   int onReplySent(const AmSipReply& reply);
85   void onNoAck(unsigned int ack_cseq);
86 };
87 
88 #endif
89