From e4ba6dbc3f1e76890b22773807ea37fe8fa2b1bc Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Wed, 10 Apr 2024 22:34:10 +0200
Subject: Adding upstream version 4.2.2.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 ui/tap-iax2-analysis.c | 125 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 125 insertions(+)
 create mode 100644 ui/tap-iax2-analysis.c

(limited to 'ui/tap-iax2-analysis.c')

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;
+}
-- 
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