Add a rate tracker that tracks rate over a given interval split up into buckets that accumulate uni…

webrtc/video/send_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/send_statistics_proxy.h"
 
 #include <algorithm>
 #include <map>
 
 #include "webrtc/base/checks.h"
 
 #include "webrtc/system_wrappers/interface/critical_section_wrapper.h"
 #include "webrtc/system_wrappers/interface/logging.h"
 #include "webrtc/system_wrappers/interface/metrics.h"
 
 namespace webrtc {
 
 const int SendStatisticsProxy::kStatsTimeoutMs = 5000;
+const size_t SendStatisticsProxy::kFrameRateTrackerInterval = 15u;

[noahric, 2015/08/07 23:56:38]

I think you'll want this to be configurable, since desired stats periods may
vary.

[tpsiaki, 2015/08/11 18:33:27]

I switched this to be based on the kStatsTimeoutMs setting for now since that's
the expiration time used for other statistics.  I'll look into where it might
make sense to add runtime configurability for this as well.

 
 SendStatisticsProxy::SendStatisticsProxy(Clock* clock,
                                          const VideoSendStream::Config& config)
     : clock_(clock),
       config_(config),
+      input_frame_rate_tracker_(kFrameRateTrackerInterval),
+      input_frame_rate_tracker_total_(kFrameRateTrackerInterval),
+      sent_frame_rate_tracker_total_(kFrameRateTrackerInterval),
       last_sent_frame_timestamp_(0),
       max_sent_width_per_timestamp_(0),
       max_sent_height_per_timestamp_(0) {
 }
 
 SendStatisticsProxy::~SendStatisticsProxy() {
   UpdateHistograms();
 }
 
 void SendStatisticsProxy::UpdateHistograms() {
@@ skipping 228 matching lines @@
   ++num_samples;
 }
 
 int SendStatisticsProxy::SampleCounter::Avg(int min_required_samples) const {
   if (num_samples < min_required_samples || num_samples == 0)
     return -1;
   return sum / num_samples;
 }
 
 }  // namespace webrtc