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From: Andreas Pehrson <apehrson@mozilla.com>
Date: Thu, 6 Jan 2022 00:16:00 +0000
Subject: Bug 1748478 - Propagate calculated discarded packets to stats. r=bwc

Differential Revision: https://phabricator.services.mozilla.com/D135061
Mercurial Revision: https://hg.mozilla.org/mozilla-central/rev/56fbf0469e25fa0d589c51ca112ce534a7c0ab91
---
 video/receive_statistics_proxy.cc   | 9 +++++++--
 video/rtp_video_stream_receiver2.cc | 4 +++-
 2 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/video/receive_statistics_proxy.cc b/video/receive_statistics_proxy.cc
index 8ef4d553ad..a0f19999d8 100644
--- a/video/receive_statistics_proxy.cc
+++ b/video/receive_statistics_proxy.cc
@@ -800,8 +800,13 @@ void ReceiveStatisticsProxy::OnDroppedFrames(uint32_t frames_dropped) {
 }
 
 void ReceiveStatisticsProxy::OnDiscardedPackets(uint32_t packets_discarded) {
-  RTC_DCHECK_RUN_ON(&main_thread_);
-  stats_.packets_discarded += packets_discarded;
+  // Can be called on either the decode queue or the worker thread
+  // See FrameBuffer2 for more details.
+  worker_thread_->PostTask(
+      SafeTask(task_safety_.flag(), [packets_discarded, this]() {
+        RTC_DCHECK_RUN_ON(&main_thread_);
+        stats_.packets_discarded += packets_discarded;
+      }));
 }
 
 void ReceiveStatisticsProxy::OnPreDecode(VideoCodecType codec_type, int qp) {
diff --git a/video/rtp_video_stream_receiver2.cc b/video/rtp_video_stream_receiver2.cc
index 0954327f1c..12e777c58f 100644
--- a/video/rtp_video_stream_receiver2.cc
+++ b/video/rtp_video_stream_receiver2.cc
@@ -1222,7 +1222,9 @@ void RtpVideoStreamReceiver2::FrameDecoded(int64_t picture_id) {
     packet_infos_.erase(packet_infos_.begin(),
                         packet_infos_.upper_bound(unwrapped_rtp_seq_num));
     uint32_t num_packets_cleared = packet_buffer_.ClearTo(seq_num);
-    vcm_receive_statistics_->OnDiscardedPackets(num_packets_cleared);
+    if (num_packets_cleared > 0) {
+      vcm_receive_statistics_->OnDiscardedPackets(num_packets_cleared);
+    }
     reference_finder_->ClearTo(seq_num);
   }
 }