diff options
Diffstat (limited to 'ui/tap-iax2-analysis.c')
| -rw-r--r-- | ui/tap-iax2-analysis.c | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/ui/tap-iax2-analysis.c b/ui/tap-iax2-analysis.c new file mode 100644 index 00000000..dbdbeb37 --- /dev/null +++ b/ui/tap-iax2-analysis.c @@ -0,0 +1,125 @@ +/* tap-iax2-analysis.c + * IAX2 analysis addition for Wireshark + * + * based on rtp_analysis.c + * Copyright 2003, Alcatel Business Systems + * By Lars Ruoff <lars.ruoff@gmx.net> + * + * based on tap_rtp.c + * Copyright 2003, Iskratel, Ltd, Kranj + * By Miha Jemec <m.jemec@iskratel.si> + * + * Wireshark - Network traffic analyzer + * By Gerald Combs <gerald@wireshark.org> + * Copyright 1998 Gerald Combs + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +#include "config.h" + +#include <math.h> + +#include <glib.h> + +#include <epan/dissectors/packet-iax2.h> + +#include "tap-iax2-analysis.h" + +/****************************************************************************/ +/* This comes from tap-rtp-common.c */ +/****************************************************************************/ + +void +iax2_packet_analyse(tap_iax2_stat_t *statinfo, + packet_info *pinfo, + const struct _iax2_info_t *iax2info) +{ + double current_time; + double current_jitter; + double current_diff; + + statinfo->flags = 0; + /* check payload type */ + if (iax2info->ftype == AST_FRAME_VOICE) { + if (iax2info->csub != statinfo->pt) { + statinfo->flags |= STAT_FLAG_PT_CHANGE; + } + statinfo->pt = iax2info->csub; + } + + /* store the current time and calculate the current jitter */ + current_time = nstime_to_sec(&pinfo->rel_ts); + current_diff = fabs (current_time - statinfo->time - (((double)iax2info->timestamp - (double)statinfo->timestamp)/1000)); + current_jitter = statinfo->jitter + ( current_diff - statinfo->jitter)/16; + statinfo->delta = current_time - (statinfo->time); + statinfo->jitter = current_jitter; + statinfo->diff = current_diff; + + /* calculate the BW in Kbps adding the IP+IAX2 header to the RTP -> 20bytes(IP)+ 4bytes(Mini) = 24bytes */ + statinfo->bw_history[statinfo->bw_index].bytes = iax2info->payload_len + 24; + statinfo->bw_history[statinfo->bw_index].time = current_time; + /* check if there are more than 1sec in the history buffer to calculate BW in bps. If so, remove those for the calculation */ + while ((statinfo->bw_history[statinfo->bw_start_index].time+1) < current_time) { + statinfo->total_bytes -= statinfo->bw_history[statinfo->bw_start_index].bytes; + statinfo->bw_start_index++; + if (statinfo->bw_start_index == BUFF_BW) { + statinfo->bw_start_index = 0; + } + }; + statinfo->total_bytes += iax2info->payload_len + 24; + statinfo->bandwidth = (double)(statinfo->total_bytes*8)/1000; + statinfo->bw_index++; + if (statinfo->bw_index == BUFF_BW) { + statinfo->bw_index = 0; + } + + /* is this the first packet we got in this direction? */ + if (statinfo->first_packet) { + statinfo->start_seq_nr = 0; + statinfo->start_time = current_time; + statinfo->delta = 0; + statinfo->jitter = 0; + statinfo->diff = 0; + statinfo->flags |= STAT_FLAG_FIRST; + statinfo->first_packet = FALSE; + } + /* is it a regular packet? */ + if (!(statinfo->flags & STAT_FLAG_FIRST) + && !(statinfo->flags & STAT_FLAG_MARKER) + && !(statinfo->flags & STAT_FLAG_PT_CN) + && !(statinfo->flags & STAT_FLAG_WRONG_TIMESTAMP) + && !(statinfo->flags & STAT_FLAG_FOLLOW_PT_CN)) { + /* include it in maximum delta calculation */ + if (statinfo->delta > statinfo->max_delta) { + statinfo->max_delta = statinfo->delta; + statinfo->max_nr = pinfo->num; + } + /* maximum and mean jitter calculation */ + if (statinfo->jitter > statinfo->max_jitter) { + statinfo->max_jitter = statinfo->jitter; + } + statinfo->mean_jitter = (statinfo->mean_jitter*statinfo->total_nr + current_jitter) / (statinfo->total_nr+1); + } + /* regular payload change? (CN ignored) */ + if (!(statinfo->flags & STAT_FLAG_FIRST) + && !(statinfo->flags & STAT_FLAG_PT_CN)) { + if ((statinfo->pt != statinfo->reg_pt) + && (statinfo->reg_pt != PT_UNDEFINED)) { + statinfo->flags |= STAT_FLAG_REG_PT_CHANGE; + } + } + + /* set regular payload*/ + if (!(statinfo->flags & STAT_FLAG_PT_CN)) { + statinfo->reg_pt = statinfo->pt; + } + + /* TODO: lost packets / duplicated: we should infer this from timestamp... */ + statinfo->time = current_time; + statinfo->timestamp = iax2info->timestamp; /* millisecs */ + statinfo->stop_seq_nr = 0; + statinfo->total_nr++; + + return; +} |