Delete browser MSE implementation.

media/base/android/media_statistics.h

-// Copyright 2015 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 MEDIA_BASE_ANDROID_MEDIA_STATISTICS_H_
-#define MEDIA_BASE_ANDROID_MEDIA_STATISTICS_H_
-
-#include <stdint.h>
-#include "base/time/time.h"
-#include "media/base/demuxer_stream.h"
-#include "media/base/timestamp_constants.h"
-
-namespace media {
-
-// FrameStatistics struct deals with frames of one stream, i.e. either
-// audio or video.
-struct FrameStatistics {
-  // Audio: total number of frames that have been rendered.
-  // Video: total number of frames that were supposed to be rendered. Late video
-  //        frames might be skipped, but are counted here.
-  uint32_t total = 0;
-
-  // A number of late frames. Late frames are a subset of the total frames.
-  // Audio: The frame is late if it might cause an underrun, i.e. comes from
-  //        decoder when audio buffer is already depleted.
-  // Video: The frame is late if it missed its presentation time as determined
-  //        by PTS when it comes from decoder.  The rendering policy (i.e.
-  //        render or skip) does not affect this number.
-  uint32_t late = 0;
-
-  void Clear() { total = late = 0; }
-
-  // Increments |total| frame count.
-  void IncrementFrameCount() { ++total; }
-
-  // Increments |late| frame count except it is the first frame after start.
-  // For each IncrementLateFrameCount() call there should be preceding
-  // IncrementFrameCount() call.
-  void IncrementLateFrameCount();
-};
-
-// MediaStatistics class gathers and reports playback quality statistics to UMA.
-//
-// This class is not thread safe. The caller should guarantee that operations
-// on FrameStatistics objects does not happen during Start() and
-// StopAndReport(). The Start() and StopAndReport() methods need to be called
-// sequentially.
-
-class MediaStatistics {
- public:
-  MediaStatistics();
-  ~MediaStatistics();
-
-  // Returns the frame statistics for audio frames.
-  FrameStatistics& audio_frame_stats() { return audio_frame_stats_; }
-
-  // Returns the frame statistics for video frames.
-  FrameStatistics& video_frame_stats() { return video_frame_stats_; }
-
-  // Starts gathering statistics. When called in a row only the first call will
-  // take effect.
-  void Start(base::TimeDelta current_playback_time);
-
-  // Stops gathering statistics, calculate and report results. When called
-  // in a row only the first call will take effect.
-  void StopAndReport(base::TimeDelta current_playback_time);
-
-  // Adds starvation event. Starvation happens when the player interrupts
-  // the regular playback and asks for more data.
-  void AddStarvation() { ++num_starvations_; }
-
- private:
-  // Resets the data to the initial state.
-  void Clear();
-
-  // Calculates relative data based on total frame numbers and reports it and
-  // the duration to UMA.
-  void Report(base::TimeDelta duration);
-
-  base::TimeDelta start_time_ = kNoTimestamp;
-  FrameStatistics audio_frame_stats_;
-  FrameStatistics video_frame_stats_;
-  uint32_t num_starvations_ = 0;
-};
-
-}  // namespace media
-
-#endif  // MEDIA_BASE_ANDROID_MEDIA_STATISTICS_H_