Add stats for forced software encoder fallback for VP8.

video/send_statistics_proxy.h

 /*
  *  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.
  */
 
 #ifndef VIDEO_SEND_STATISTICS_PROXY_H_
 #define VIDEO_SEND_STATISTICS_PROXY_H_
 
 #include <map>
 #include <memory>
 #include <string>
 #include <vector>
 
-#include "common_types.h"
+#include "common_types.h"  // NOLINT(build/include)
 #include "modules/video_coding/include/video_codec_interface.h"
 #include "modules/video_coding/include/video_coding_defines.h"
 #include "rtc_base/criticalsection.h"
 #include "rtc_base/numerics/exp_filter.h"
 #include "rtc_base/ratetracker.h"
 #include "rtc_base/thread_annotations.h"
 #include "system_wrappers/include/clock.h"
 #include "video/overuse_frame_detector.h"
 #include "video/report_block_stats.h"
 #include "video/stats_counter.h"
@@ skipping 113 matching lines @@
     int64_t resolution_update_ms;
     int64_t bitrate_update_ms;
   };
   struct TargetRateUpdates {
     TargetRateUpdates()
         : pause_resume_events(0), last_paused_or_resumed(false), last_ms(-1) {}
     int pause_resume_events;
     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);
     void Restart(int64_t now_ms);
     int64_t start_ms = -1;
     int64_t total_ms = 0;
   };
   struct QpCounters {
     SampleCounter vp8;   // QP range: 0-127.
     SampleCounter vp9;   // QP range: 0-255.
     SampleCounter h264;  // QP range: 0-51.
   };
   void PurgeOldStats() RTC_EXCLUSIVE_LOCKS_REQUIRED(crit_);
   VideoSendStream::StreamStats* GetStatsEntry(uint32_t ssrc)
       RTC_EXCLUSIVE_LOCKS_REQUIRED(crit_);
 
   void SetAdaptTimer(const VideoStreamEncoder::AdaptCounts& counts,
                      StatsTimer* timer) RTC_EXCLUSIVE_LOCKS_REQUIRED(crit_);
   void UpdateAdaptationStats(
       const VideoStreamEncoder::AdaptCounts& cpu_counts,
       const VideoStreamEncoder::AdaptCounts& quality_counts)
       RTC_EXCLUSIVE_LOCKS_REQUIRED(crit_);
 
+  void UpdateEncoderFallbackStats(const CodecSpecificInfo* codec_info)
+      RTC_EXCLUSIVE_LOCKS_REQUIRED(crit_);
+
   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_ RTC_GUARDED_BY(crit_);
   const int64_t start_ms_;
   VideoSendStream::Stats stats_ RTC_GUARDED_BY(crit_);
   uint32_t last_sent_frame_timestamp_ RTC_GUARDED_BY(crit_);
   std::map<uint32_t, StatsUpdateTimes> update_times_ RTC_GUARDED_BY(crit_);
   rtc::ExpFilter encode_time_ RTC_GUARDED_BY(crit_);
   int quality_downscales_ RTC_GUARDED_BY(crit_);
   int cpu_downscales_ RTC_GUARDED_BY(crit_);
 
@@ skipping 36 matching lines @@
     RateAccCounter rtx_byte_counter_;
     RateAccCounter padding_byte_counter_;
     RateAccCounter retransmit_byte_counter_;
     RateAccCounter fec_byte_counter_;
     int64_t first_rtcp_stats_time_ms_;
     int64_t first_rtp_stats_time_ms_;
     StatsTimer cpu_adapt_timer_;
     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_;
 
     std::map<int, QpCounters>
         qp_counters_;  // QP counters mapped by spatial idx.
   };
 
   std::unique_ptr<UmaSamplesContainer> uma_container_ RTC_GUARDED_BY(crit_);
 };
 
 }  // namespace webrtc
 #endif  // VIDEO_SEND_STATISTICS_PROXY_H_