[Chromecast] Add metrics for logging platform A/V bitrate estimates.

chromecast/media/cma/pipeline/media_pipeline_impl.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROMECAST_MEDIA_CMA_PIPELINE_MEDIA_PIPELINE_IMPL_H_
 #define CHROMECAST_MEDIA_CMA_PIPELINE_MEDIA_PIPELINE_IMPL_H_
 
 #include <string>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/threading/thread_checker.h"
+#include "base/time/time.h"
 #include "chromecast/media/cma/pipeline/load_type.h"
 #include "chromecast/media/cma/pipeline/media_pipeline_client.h"
 #include "chromecast/public/media/media_pipeline_backend.h"
 
 namespace media {
 class AudioDecoderConfig;
 class VideoDecoderConfig;
 }  // namespace media
 
 namespace chromecast {
@@ skipping 49 matching lines @@
   struct FlushTask;
   void OnFlushDone(bool is_audio_stream);
 
   // Invoked to notify about a change of buffering state.
   void OnBufferingNotification(bool is_buffering);
 
   void UpdateMediaTime();
 
   void OnError(::media::PipelineStatus error);
 
+  void ResetBitrateState();
+
   base::ThreadChecker thread_checker_;
   MediaPipelineClient client_;
   scoped_ptr<BufferingController> buffering_controller_;
   BrowserCdmCast* cdm_;
 
   // Interface with the underlying hardware media pipeline.
   BackendState backend_state_;
   // Playback rate set by the upper layer.
   // Cached here because CMA pipeline backend does not support rate == 0,
   // which is emulated by pausing the backend.
   float playback_rate_;
   scoped_ptr<MediaPipelineBackend> media_pipeline_backend_;
   scoped_ptr<AudioDecoderSoftwareWrapper> audio_decoder_;
   MediaPipelineBackend::VideoDecoder* video_decoder_;
 
   scoped_ptr<AudioPipelineImpl> audio_pipeline_;
   scoped_ptr<VideoPipelineImpl> video_pipeline_;
   scoped_ptr<FlushTask> pending_flush_task_;
 
   // The media time is retrieved at regular intervals.
   bool pending_time_update_task_;
   base::TimeDelta last_media_time_;
 
   // Used to make the statistics update period a multiplier of the time update
   // period.
   int statistics_rolling_counter_;
+  base::Time last_sample_time_;

[kmackay, 2016/03/11 17:47:40]

I recommend using base::TimeTicks

[ejason, 2016/03/11 20:18:08]

Done.

+  base::TimeDelta elapsed_time_delta_;
+  int audio_bytes_for_bitrate_estimation_;
+  int video_bytes_for_bitrate_estimation_;
 
   base::WeakPtr<MediaPipelineImpl> weak_this_;
   base::WeakPtrFactory<MediaPipelineImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaPipelineImpl);
 };
 
 }  // namespace media
 }  // namespace chromecast
 
 #endif  // CHROMECAST_MEDIA_CMA_PIPELINE_MEDIA_PIPELINE_IMPL_H_