Add QP stats for received video streams to StatsReport.

webrtc/video/receive_statistics_proxy.cc

 /*
  *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #include "webrtc/video/receive_statistics_proxy.h"
 
 #include <cmath>
 
 #include "webrtc/base/checks.h"
 #include "webrtc/modules/video_coding/codecs/interface/video_codec_interface.h"
 #include "webrtc/system_wrappers/interface/clock.h"
 #include "webrtc/system_wrappers/interface/critical_section_wrapper.h"
 #include "webrtc/system_wrappers/interface/metrics.h"
 
 namespace webrtc {
+namespace {
+const float kQpWeigthFactor = 0.97f;
+}  // namespace
 
 ReceiveStatisticsProxy::ReceiveStatisticsProxy(uint32_t ssrc, Clock* clock)
     : clock_(clock),
       // 1000ms window, scale 1000 for ms to s.
       decode_fps_estimator_(1000, 1000),
       renders_fps_estimator_(1000, 1000),
       render_fps_tracker_(100u, 10u),
-      render_pixel_tracker_(100u, 10u) {
+      render_pixel_tracker_(100u, 10u),
+      qp_(kQpWeigthFactor) {
   stats_.ssrc = ssrc;
 }
 
 ReceiveStatisticsProxy::~ReceiveStatisticsProxy() {
   UpdateHistograms();
 }
 
 void ReceiveStatisticsProxy::UpdateHistograms() {
   int fraction_lost = report_block_stats_.FractionLostInPercent();
   if (fraction_lost != -1) {
@@ skipping 147 matching lines @@
 
 void ReceiveStatisticsProxy::OnPreDecode(
     const EncodedImage& encoded_image,
     const CodecSpecificInfo* codec_specific_info) {
   if (codec_specific_info == nullptr || encoded_image.qp_ == -1) {
     return;
   }
   if (codec_specific_info->codecType == kVideoCodecVP8) {
     qp_counters_.vp8.Add(encoded_image.qp_);
   }
+  qp_.Apply(1.0f, encoded_image.qp_);
+
+  rtc::CritScope lock(&crit_);
+  stats_.qp = round(qp_.filtered());
 }
 
 void ReceiveStatisticsProxy::SampleCounter::Add(int sample) {
   sum += sample;
   ++num_samples;
 }
 
 int ReceiveStatisticsProxy::SampleCounter::Avg(int min_required_samples) const {
   if (num_samples < min_required_samples || num_samples == 0)
     return -1;
   return sum / num_samples;
 }
 
 }  // namespace webrtc