forked from osmocom/wireshark
28476a2a18
I've written this patch to use the 'Delay since last SR' (DLSR) field found in SR reports to calculate and report roundtrip-propagation delays. This is described in rfc 3550, section 6.4.1, inside the description of DLSR. Only the endpoint can compute the end-end roundtrip delay, and only they know exactly when the report is received and can compare it with the 'Last SR timestamp' (LSR) that they set. This patch instead takes the difference between the capture times of the 2 reports and subtracts the DLSR (the LSR is checked in case the SR it's referring to wasn't captured). The time difference represents a roundtrip network delay between the point of capture and the sender of the SR containing the DLSR. svn path=/trunk/; revision=11998
60 lines
2 KiB
C
60 lines
2 KiB
C
/* packet-rtcp.h
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*
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* $Id$
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*
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* Routines for RTCP dissection
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* RTCP = Real-time Transport Control Protocol
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*
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* Copyright 2000, Philips Electronics N.V.
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* Written by Andreas Sikkema <andreas.sikkema@philips.com>
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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/* Info to save in RTCP conversation / packet-info.
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Note that this structure applies to the destination end of
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an RTP session */
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#define MAX_RTCP_SETUP_METHOD_SIZE 8
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struct _rtcp_conversation_info
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{
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/* Setup info is relevant to traffic whose dest is the conversation address */
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guchar setup_method_set;
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gchar setup_method[MAX_RTCP_SETUP_METHOD_SIZE];
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guint32 setup_frame_number;
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/* Info used for roundtrip calculations */
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guchar last_received_set;
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guint32 last_received_frame_number;
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guint32 last_received_time_secs;
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guint32 last_received_time_usecs;
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guint32 last_received_ts;
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/* Stored result of calculation (ms) */
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guchar calculated_delay_set;
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guint32 calculated_delay_used_frame;
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guint32 calculated_delay;
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};
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/* Add an RTCP conversation with the given details */
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void rtcp_add_address(packet_info *pinfo,
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address *addr, int port,
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int other_port,
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gchar *setup_method, guint32 setup_frame_number);
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