Add SentToInputFpsRatioPercent UMA metric on send side

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.
  */
 
@@ skipping 171 matching lines @@
     LOG(LS_INFO) << uma_prefix_ << "SentHeightInPixels " << sent_height;
   }
   AggregatedStats sent_fps = sent_fps_counter_.GetStats();
   if (sent_fps.num_samples >= kMinRequiredPeriodicSamples) {
     RTC_HISTOGRAMS_COUNTS_100(kIndex, uma_prefix_ + "SentFramesPerSecond",
                               sent_fps.average);
     LOG(LS_INFO) << uma_prefix_ + "SentFramesPerSecond, "
                  << sent_fps.ToString();
   }
 
+  if (in_fps.num_samples > kMinRequiredPeriodicSamples &&
+      sent_fps.num_samples >= kMinRequiredPeriodicSamples) {
+    int in_fps_avg = in_fps.average;
+    if (in_fps_avg > 0) {
+      int sent_fps_avg = sent_fps.average;
+      int sent_to_in_fps_ratio_percent =
+          (100 * sent_fps_avg + in_fps_avg / 2) / in_fps_avg;
+      // If reported period is small, it may happen that sent_fps is larger than
+      // input_fps briefly on average. This should be treated as 100% sent to
+      // input ratio.
+      if (sent_to_in_fps_ratio_percent > 100)
+        sent_to_in_fps_ratio_percent = 100;
+      RTC_HISTOGRAMS_PERCENTAGE(kIndex,
+                                uma_prefix_ + "SentToInputFpsRatioPercent",
+                                sent_to_in_fps_ratio_percent);
+      LOG(LS_INFO) << uma_prefix_ << "SentToInputFpsRatioPercent "
+                   << sent_to_in_fps_ratio_percent;
+    }
+  }
+
   int encode_ms = encode_time_counter_.Avg(kMinRequiredMetricsSamples);
   if (encode_ms != -1) {
     RTC_HISTOGRAMS_COUNTS_1000(kIndex, uma_prefix_ + "EncodeTimeInMs",
                                encode_ms);
     LOG(LS_INFO) << uma_prefix_ << "EncodeTimeInMs " << encode_ms;
   }
   int key_frames_permille =
       key_frame_counter_.Permille(kMinRequiredMetricsSamples);
   if (key_frames_permille != -1) {
     RTC_HISTOGRAMS_COUNTS_1000(kIndex, uma_prefix_ + "KeyFramesSentInPermille",
@@ skipping 709 matching lines @@
 }
 
 int SendStatisticsProxy::BoolSampleCounter::Fraction(
     int64_t min_required_samples,
     float multiplier) const {
   if (num_samples < min_required_samples || num_samples == 0)
     return -1;
   return static_cast<int>((sum * multiplier / num_samples) + 0.5f);
 }
 }  // namespace webrtc