Only record received key frame histogram stats if a certain number of frames (kMinRequiredSamples) …

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.
  */
 
@@ skipping 116 matching lines @@
     RTC_HISTOGRAM_COUNTS_10000("WebRTC.Video.AVSyncOffsetInMs", sync_offset_ms);
   }
   AggregatedStats freq_offset_stats = freq_offset_counter_.GetStats();
   if (freq_offset_stats.num_samples > 0) {
     RTC_HISTOGRAM_COUNTS_10000("WebRTC.Video.RtpToNtpFreqOffsetInKhz",
                                freq_offset_stats.average);
     LOG(LS_INFO) << "WebRTC.Video.RtpToNtpFreqOffsetInKhz, "
                  << freq_offset_stats.ToString();
   }
 
-  if (stats_.frame_counts.key_frames > 0 ||
-      stats_.frame_counts.delta_frames > 0) {
-    float num_key_frames = stats_.frame_counts.key_frames;
-    float num_total_frames =
-        stats_.frame_counts.key_frames + stats_.frame_counts.delta_frames;
+  int num_total_frames =
+      stats_.frame_counts.key_frames + stats_.frame_counts.delta_frames;
+  if (num_total_frames >= kMinRequiredSamples) {
+    int num_key_frames = stats_.frame_counts.key_frames;
     int key_frames_permille =
-        (num_key_frames * 1000.0f / num_total_frames + 0.5f);
+        (num_key_frames * 1000 + num_total_frames / 2) / num_total_frames;
     RTC_HISTOGRAM_COUNTS_1000("WebRTC.Video.KeyFramesReceivedInPermille",
                               key_frames_permille);
   }
 
   int qp = qp_counters_.vp8.Avg(kMinRequiredSamples);
   if (qp != -1)
     RTC_HISTOGRAM_COUNTS_200("WebRTC.Video.Decoded.Vp8.Qp", qp);
 
   int decode_ms = decode_time_counter_.Avg(kMinRequiredSamples);
   if (decode_ms != -1)
@@ skipping 433 matching lines @@
   sum = 0;
 }
 
 void ReceiveStatisticsProxy::OnRttUpdate(int64_t avg_rtt_ms,
                                          int64_t max_rtt_ms) {
   rtc::CritScope lock(&crit_);
   avg_rtt_ms_ = avg_rtt_ms;
 }
 
 }  // namespace webrtc