From f040b2367d894345677192f924590309be8c72fc Mon Sep 17 00:00:00 2001
From: asapersson <asapersson@webrtc.org>
Date: Wed, 4 Nov 2015 00:59:03 -0800
Subject: [PATCH] Add histograms for send-side delay stats for a sent video
 stream:

- "WebRTC.Video.SendSideDelayInMs"
- "WebRTC.Video.SendSideDelayMaxInMs"

BUG=chromium:512752

Review URL: https://codereview.webrtc.org/1405023014

Cr-Commit-Position: refs/heads/master@{#10502}
---
 webrtc/video/send_statistics_proxy.cc | 12 ++++++++++++
 webrtc/video/send_statistics_proxy.h  |  2 ++
 2 files changed, 14 insertions(+)

diff --git a/webrtc/video/send_statistics_proxy.cc b/webrtc/video/send_statistics_proxy.cc
index 5be9970583..916ffb3baa 100644
--- a/webrtc/video/send_statistics_proxy.cc
+++ b/webrtc/video/send_statistics_proxy.cc
@@ -121,6 +121,15 @@ void SendStatisticsProxy::UpdateHistograms() {
     RTC_HISTOGRAM_ENUMERATION(
         "WebRTC.Video.BandwidthLimitedResolutionsDisabled", num_disabled, 10);
   }
+  int delay_ms = delay_counter_.Avg(kMinRequiredSamples);
+  if (delay_ms != -1)
+    RTC_HISTOGRAM_COUNTS_100000("WebRTC.Video.SendSideDelayInMs", delay_ms);
+
+  int max_delay_ms = max_delay_counter_.Avg(kMinRequiredSamples);
+  if (max_delay_ms != -1) {
+    RTC_HISTOGRAM_COUNTS_100000(
+        "WebRTC.Video.SendSideDelayMaxInMs", max_delay_ms);
+  }
 }
 
 void SendStatisticsProxy::OnOutgoingRate(uint32_t framerate, uint32_t bitrate) {
@@ -337,6 +346,9 @@ void SendStatisticsProxy::SendSideDelayUpdated(int avg_delay_ms,
     return;
   stats->avg_delay_ms = avg_delay_ms;
   stats->max_delay_ms = max_delay_ms;
+
+  delay_counter_.Add(avg_delay_ms);
+  max_delay_counter_.Add(max_delay_ms);
 }
 
 void SendStatisticsProxy::SampleCounter::Add(int sample) {
diff --git a/webrtc/video/send_statistics_proxy.h b/webrtc/video/send_statistics_proxy.h
index 26ea09c4c4..2939a671d1 100644
--- a/webrtc/video/send_statistics_proxy.h
+++ b/webrtc/video/send_statistics_proxy.h
@@ -142,6 +142,8 @@ class SendStatisticsProxy : public CpuOveruseMetricsObserver,
   SampleCounter quality_downscales_counter_ GUARDED_BY(crit_);
   BoolSampleCounter bw_limited_frame_counter_ GUARDED_BY(crit_);
   SampleCounter bw_resolutions_disabled_counter_ GUARDED_BY(crit_);
+  SampleCounter delay_counter_ GUARDED_BY(crit_);
+  SampleCounter max_delay_counter_ GUARDED_BY(crit_);
 };
 
 }  // namespace webrtc