Add stats for forced software encoder fallback for VP8.

webrtc/video/send_statistics_proxy.h

Index: webrtc/video/send_statistics_proxy.h
diff --git a/webrtc/video/send_statistics_proxy.h b/webrtc/video/send_statistics_proxy.h
index fead8488f3143b539c7137ff94cbd4f957519f9d..53ab7bea4700b0fed1b59480e336e107e3677626 100644
--- a/webrtc/video/send_statistics_proxy.h
+++ b/webrtc/video/send_statistics_proxy.h
@@ -150,6 +150,14 @@ class SendStatisticsProxy : public CpuOveruseMetricsObserver,
     bool last_paused_or_resumed;
     int64_t last_ms;
   };
+  struct FallbackEncoderInfo {
+    bool is_possible = true;
+    bool is_active = false;
+    int on_off_events = 0;
+    int64_t elapsed_ms = 0;
+    rtc::Optional<int64_t> last_update_ms;
+    const int max_frame_diff_ms = 2000;
+  };
   struct StatsTimer {
     void Start(int64_t now_ms);
     void Stop(int64_t now_ms);
@@ -174,9 +182,14 @@ class SendStatisticsProxy : public CpuOveruseMetricsObserver,
       const VideoStreamEncoder::AdaptCounts& quality_counts)
       EXCLUSIVE_LOCKS_REQUIRED(crit_);
 
+  void UpdateEncoderFallbackStats(const CodecSpecificInfo* codec_info,
+                                  FallbackEncoderInfo* fallback_info)
+      EXCLUSIVE_LOCKS_REQUIRED(crit_);

[brandtr, 2017/09/14 12:30:12]

I think you have to rebase this to use the RTC_ prefixed version now.

[åsapersson, 2017/09/14 14:41:44]

Done.

+
   Clock* const clock_;
   const std::string payload_name_;
   const VideoSendStream::Config::Rtp rtp_config_;
+  const rtc::Optional<int> min_first_fallback_interval_ms_;
   rtc::CriticalSection crit_;
   VideoEncoderConfig::ContentType content_type_ GUARDED_BY(crit_);
   const int64_t start_ms_;
@@ -233,6 +246,8 @@ class SendStatisticsProxy : public CpuOveruseMetricsObserver,
     StatsTimer quality_adapt_timer_;
     BoolSampleCounter paused_time_counter_;
     TargetRateUpdates target_rate_updates_;
+    BoolSampleCounter fallback_active_counter_;
+    FallbackEncoderInfo fallback_info_;
     ReportBlockStats report_block_stats_;
     const VideoSendStream::Stats start_stats_;