NetEq: Implement counting of Delayed Packet Outage Events per minute

webrtc/modules/audio_coding/neteq/statistics_calculator.h

Index: webrtc/modules/audio_coding/neteq/statistics_calculator.h
diff --git a/webrtc/modules/audio_coding/neteq/statistics_calculator.h b/webrtc/modules/audio_coding/neteq/statistics_calculator.h
index 513322f882525c712d073c871181a56822778cfb..c27aabe1281b757926df125dbc4abf85c86907ee 100644
--- a/webrtc/modules/audio_coding/neteq/statistics_calculator.h
+++ b/webrtc/modules/audio_coding/neteq/statistics_calculator.h
@@ -64,7 +64,8 @@ class StatisticsCalculator {
   void LostSamples(int num_samples);
 
   // Increases the report interval counter with |num_samples| at a sample rate
-  // of |fs_hz|.
+  // of |fs_hz|. This is how the StatisticsCalculator gets notified that current
+  // time is increasing.
   void IncreaseCounter(int num_samples, int fs_hz);
 
   // Stores new packet waiting time in waiting time statistics.
@@ -95,6 +96,23 @@ class StatisticsCalculator {
   static const int kMaxReportPeriod = 60;  // Seconds before auto-reset.
   static const int kLenWaitingTimes = 100;
 
+  class DelayedPacketOutagesPerMinuteCounter {
+   public:
+    ~DelayedPacketOutagesPerMinuteCounter() {
+      LogToUma();  // Log the count for the current (incomplete) interval.
+    }
+    void RegisterEvent();
+    void AdvanceClock(int step_ms);
+
+   private:
+    static const int kReportIntervalMs = 60 * 1000;  // One minute.
+
+    void LogToUma() const;
+
+    int counter_ = 0;
+    int timer_ = 0;
+  };
+
   // Calculates numerator / denominator, and returns the value in Q14.
   static uint16_t CalculateQ14Ratio(uint32_t numerator, uint32_t denominator);
 
@@ -110,6 +128,7 @@ class StatisticsCalculator {
   int len_waiting_times_;
   int next_waiting_time_index_;
   uint32_t secondary_decoded_samples_;
+  DelayedPacketOutagesPerMinuteCounter delayed_packet_outage_counter_;
 
   DISALLOW_COPY_AND_ASSIGN(StatisticsCalculator);
 };