From e1847cadc55bd376392609f4f2926cd28a997bc4 Mon Sep 17 00:00:00 2001
From: Julien Chavanton <jchavanton@gmail.com>
Date: Tue, 24 Nov 2020 18:40:39 +0000
Subject: [PATCH] RTT per call leg

---
 daemon/call_interfaces.c | 1 +
 daemon/ssrc.c            | 2 ++
 include/ssrc.h           | 1 +
 3 files changed, 4 insertions(+)

diff --git a/daemon/call_interfaces.c b/daemon/call_interfaces.c
index 6318860f6..436fd3705 100644
--- a/daemon/call_interfaces.c
+++ b/daemon/call_interfaces.c
@@ -1536,6 +1536,7 @@ static void ng_stats_ssrc_mos_entry_common(bencode_item_t *subent, struct ssrc_s
 {
 	bencode_dictionary_add_integer(subent, "MOS", sb->mos / div);
 	bencode_dictionary_add_integer(subent, "round-trip time", sb->rtt / div);
+	bencode_dictionary_add_integer(subent, "round-trip time leg", sb->rtt_leg / div);
 	bencode_dictionary_add_integer(subent, "jitter", sb->jitter / div);
 	bencode_dictionary_add_integer(subent, "packet loss", sb->packetloss / div);
 }
diff --git a/daemon/ssrc.c b/daemon/ssrc.c
index 535e8c957..94d6252b3 100644
--- a/daemon/ssrc.c
+++ b/daemon/ssrc.c
@@ -357,6 +357,7 @@ void ssrc_receiver_report(struct call_media *m, const struct ssrc_receiver_repor
 	*ssb = (struct ssrc_stats_block) {
 		.jitter = jitter,
 		.rtt = rtt + other_e->last_rtt,
+		.rtt_leg = rtt,
 		.reported = *tv,
 		.packetloss = (unsigned int) rr->fraction_lost * 100 / 256,
 	};
@@ -386,6 +387,7 @@ void ssrc_receiver_report(struct call_media *m, const struct ssrc_receiver_repor
 	// running tally
 	other_e->average_mos.jitter += ssb->jitter;
 	other_e->average_mos.rtt += ssb->rtt;
+	other_e->average_mos.rtt_leg += ssb->rtt_leg;
 	other_e->average_mos.packetloss += ssb->packetloss;
 	other_e->average_mos.mos += ssb->mos;
 
diff --git a/include/ssrc.h b/include/ssrc.h
index e3d34e1b9..6698d7c22 100644
--- a/include/ssrc.h
+++ b/include/ssrc.h
@@ -71,6 +71,7 @@ struct ssrc_stats_block {
 	struct timeval reported;
 	u_int64_t jitter; // ms
 	u_int64_t rtt; // us - combined from both sides
+	u_int32_t rtt_leg; // RTT only for the leg receiving the RTCP report
 	u_int64_t packetloss; // percent
 	u_int64_t mos; // nominal range of 10 - 50 for MOS values 1.0 to 5.0
 };