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-rw-r--r--ui/tap-iax2-analysis.c125
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diff --git a/ui/tap-iax2-analysis.c b/ui/tap-iax2-analysis.c
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+/* 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;
+}