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

webrtc/video/send_statistics_proxy.cc

Index: webrtc/video/send_statistics_proxy.cc
diff --git a/webrtc/video/send_statistics_proxy.cc b/webrtc/video/send_statistics_proxy.cc
index 551b4b562a43904f6cfe1105d65455b2610126b9..c16c226f471ae2f0899b8433e942584224762e8c 100644
--- a/webrtc/video/send_statistics_proxy.cc
+++ b/webrtc/video/send_statistics_proxy.cc
@@ -22,11 +22,15 @@
 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) {