NetEq: Implement counting of Delayed Packet Outage Events per minute

webrtc/modules/audio_coding/neteq/statistics_calculator.cc

Index: webrtc/modules/audio_coding/neteq/statistics_calculator.cc
diff --git a/webrtc/modules/audio_coding/neteq/statistics_calculator.cc b/webrtc/modules/audio_coding/neteq/statistics_calculator.cc
index 37a0d50946fdeb4d609deca22f71632e293ec613..dd63c122253a6912bd69431dc43108353f90cf90 100644
--- a/webrtc/modules/audio_coding/neteq/statistics_calculator.cc
+++ b/webrtc/modules/audio_coding/neteq/statistics_calculator.cc
@@ -13,12 +13,36 @@
 #include <assert.h>
 #include <string.h>  // memset
 
+#include "webrtc/base/checks.h"
 #include "webrtc/modules/audio_coding/neteq/decision_logic.h"
 #include "webrtc/modules/audio_coding/neteq/delay_manager.h"
 #include "webrtc/system_wrappers/interface/metrics.h"
 
 namespace webrtc {
 
+void StatisticsCalculator::DelayedPacketOutagesPerMinuteCounter::
+    RegisterEvent() {
+  ++counter_;
+}
+
+void StatisticsCalculator::DelayedPacketOutagesPerMinuteCounter::AdvanceClock(
+    int step_ms) {
+  timer_ += step_ms;
+  if (timer_ < kReportIntervalMs) {
+    return;
+  }
+  LogToUma();
+  counter_ = 0;
+  timer_ -= kReportIntervalMs;
+  DCHECK_GE(timer_, 0);
+}
+
+void StatisticsCalculator::DelayedPacketOutagesPerMinuteCounter::LogToUma()
+    const {
+  RTC_HISTOGRAM_COUNTS_100("WebRTC.Audio.DelayedPacketOutageEventsPerMinute",
+                           counter_);
+}
+
 StatisticsCalculator::StatisticsCalculator()
     : preemptive_samples_(0),
       accelerate_samples_(0),
@@ -84,6 +108,8 @@ void StatisticsCalculator::LostSamples(int num_samples) {
 }
 
 void StatisticsCalculator::IncreaseCounter(int num_samples, int fs_hz) {
+  delayed_packet_outage_counter_.AdvanceClock(
+      rtc::CheckedDivExact(1000 * num_samples, fs_hz));
   timestamps_since_last_report_ += static_cast<uint32_t>(num_samples);
   if (timestamps_since_last_report_ >
       static_cast<uint32_t>(fs_hz * kMaxReportPeriod)) {
@@ -101,6 +127,7 @@ void StatisticsCalculator::LogDelayedPacketOutageEvent(int outage_duration_ms) {
   RTC_HISTOGRAM_COUNTS("WebRTC.Audio.DelayedPacketOutageEventMs",
                        outage_duration_ms, 1 /* min */, 2000 /* max */,
                        100 /* bucket count */);
+  delayed_packet_outage_counter_.RegisterEvent();
 }
 
 void StatisticsCalculator::StoreWaitingTime(int waiting_time_ms) {