1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
|
/* -*- Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */
/*
* Copyright (c) Xerox Corporation 1997. All rights reserved.
*
* 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.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linking this file statically or dynamically with other modules is making
* a combined work based on this file. Thus, the terms and conditions of
* the GNU General Public License cover the whole combination.
*
* In addition, as a special exception, the copyright holders of this file
* give you permission to combine this file with free software programs or
* libraries that are released under the GNU LGPL and with code included in
* the standard release of ns-2 under the Apache 2.0 license or under
* otherwise-compatible licenses with advertising requirements (or modified
* versions of such code, with unchanged license). You may copy and
* distribute such a system following the terms of the GNU GPL for this
* file and the licenses of the other code concerned, provided that you
* include the source code of that other code when and as the GNU GPL
* requires distribution of source code.
*
* Note that people who make modified versions of this file are not
* obligated to grant this special exception for their modified versions;
* it is their choice whether to do so. The GNU General Public License
* gives permission to release a modified version without this exception;
* this exception also makes it possible to release a modified version
* which carries forward this exception.
*/
#ifndef lint
static const char rcsid[] =
"@(#) $Header: /cvsroot/nsnam/ns-2/adc/consrcvr.cc,v 1.8 2005/08/26 05:05:27 tomh Exp $";
#endif
#include "agent.h"
#include "config.h"
#include "tclcl.h"
#include "packet.h"
#include "rtp.h"
#include "adaptive-receiver.h"
#ifndef WIN32
// VC 5.0 doesn't have this
#include <sys/time.h>
#endif
//#define CONS_OFFSET 0.025*SAMPLERATE
#define CONS_OFFSET 200
class ConsRcvr : public AdaptiveRcvr {
public:
ConsRcvr();
protected:
int adapt(Packet *pkt, u_int32_t time);
int offset_;
};
static class ConsRcvrClass : public TclClass {
public:
ConsRcvrClass() : TclClass("Agent/ConsRcvr") {}
TclObject* create(int, const char*const*) {
return (new ConsRcvr());
}
} class_cons_rcvr;
ConsRcvr::ConsRcvr() : offset_(CONS_OFFSET)
{
}
int ConsRcvr::adapt(Packet *pkt, u_int32_t local_clock)
{
int delay;
hdr_cmn* ch = hdr_cmn::access(pkt);
register u_int32_t tstamp = (int)ch->timestamp();
if (((tstamp+offset_) < local_clock) || (offset_ == -1)) {
/*increase the offset */
if (offset_ < (int)(local_clock-(tstamp+offset_)))
offset_ += local_clock -(tstamp+offset_);
else
offset_ += offset_;
}
delay=offset_-(local_clock-tstamp);
return delay;
}
|
