Don't try to send REMB or VideoBitrateAllocation when RTCP is off.

Bug: webrtc:12978
Change-Id: I0bd9cb239c9d74695c1408dde985c92b2834ba2d
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/225961
Reviewed-by: Erik Språng <sprang@webrtc.org>
Commit-Queue: Philipp Hancke <phancke@nvidia.com>
Cr-Commit-Position: refs/heads/master@{#34610}

modules/rtp_rtcp/source/rtcp_sender.cc

diff --git a/modules/rtp_rtcp/source/rtcp_sender.cc b/modules/rtp_rtcp/source/rtcp_sender.cc
index 7f5e327..b6f44e5 100644
--- a/modules/rtp_rtcp/source/rtcp_sender.cc
+++ b/modules/rtp_rtcp/source/rtcp_sender.cc
@@ -282,6 +282,10 @@
 void RTCPSender::SetRemb(int64_t bitrate_bps, std::vector<uint32_t> ssrcs) {
   RTC_CHECK_GE(bitrate_bps, 0);
   MutexLock lock(&mutex_rtcp_sender_);
+  if (method_ == RtcpMode::kOff) {
+    RTC_LOG(LS_WARNING) << "Can't send rtcp if it is disabled.";
+    return;
+  }
   remb_bitrate_ = bitrate_bps;
   remb_ssrcs_ = std::move(ssrcs);
 
@@ -887,6 +891,10 @@
 void RTCPSender::SetVideoBitrateAllocation(
     const VideoBitrateAllocation& bitrate) {
   MutexLock lock(&mutex_rtcp_sender_);
+  if (method_ == RtcpMode::kOff) {
+    RTC_LOG(LS_WARNING) << "Can't send rtcp if it is disabled.";
+    return;
+  }
   // Check if this allocation is first ever, or has a different set of
   // spatial/temporal layers signaled and enabled, if so trigger an rtcp report
   // as soon as possible.