From 8d193a72bc9e97b6fb6d59c813b0eb7cc0eeb03f Mon Sep 17 00:00:00 2001
From: asapersson <asapersson@webrtc.org>
Date: Thu, 8 Dec 2016 08:13:01 -0800
Subject: [PATCH] Do not update OnReceivedRtcpReceiverReport if report block
 list is empty (and rtt zero).

For example, zero rtt may be reported to:
BitrateControllerImpl::OnReceivedRtcpReceiverReport:
- SendSideBandwidthEstimation::UpdateReceiverBlock
- SendSideBandwidthEstimation::UpdateUmaStats
BitrateAllocator::OnNetworkChanged:
- ProtectionBitrateCalculator::SetTargetRates

Re-add check that was removed in https://codereview.webrtc.org/2422063002.

BUG=webrtc:6692

Review-Url: https://codereview.webrtc.org/2552883010
Cr-Commit-Position: refs/heads/master@{#15486}
---
 webrtc/modules/bitrate_controller/bitrate_controller_impl.cc | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/webrtc/modules/bitrate_controller/bitrate_controller_impl.cc b/webrtc/modules/bitrate_controller/bitrate_controller_impl.cc
index be0e0f12f2..9be67ef28c 100644
--- a/webrtc/modules/bitrate_controller/bitrate_controller_impl.cc
+++ b/webrtc/modules/bitrate_controller/bitrate_controller_impl.cc
@@ -38,6 +38,9 @@ class BitrateControllerImpl::RtcpBandwidthObserverImpl
   void OnReceivedRtcpReceiverReport(const ReportBlockList& report_blocks,
                                     int64_t rtt,
                                     int64_t now_ms) override {
+    if (report_blocks.empty())
+      return;
+
     int fraction_lost_aggregate = 0;
     int total_number_of_packets = 0;