media/mojo/services/playback_events_recorder.h

   1 // Copyright 2020 The Chromium Authors
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef MEDIA_MOJO_SERVICES_PLAYBACK_EVENTS_RECORDER_H_
   6 #define MEDIA_MOJO_SERVICES_PLAYBACK_EVENTS_RECORDER_H_
   7
   8 #include "base/time/time.h"
   9 #include "media/mojo/mojom/playback_events_recorder.mojom.h"
  10 #include "media/mojo/services/media_mojo_export.h"
  11 #include "mojo/public/cpp/bindings/pending_remote.h"
  12 #include "mojo/public/cpp/bindings/remote.h"
  13 #include "third_party/abseil-cpp/absl/types/optional.h"
  14
  15 namespace media {
  16
  17 class MEDIA_MOJO_EXPORT PlaybackEventsRecorder final
  18     : public mojom::PlaybackEventsRecorder {
  19  public:
  20   static void Create(
  21       mojo::PendingReceiver<mojom::PlaybackEventsRecorder> receiver);
  22
  23   PlaybackEventsRecorder();
  24   ~PlaybackEventsRecorder() final;
  25
  26   PlaybackEventsRecorder(const PlaybackEventsRecorder&) = delete;
  27   PlaybackEventsRecorder& operator=(const PlaybackEventsRecorder&) =
  28       delete;
  29
  30   // mojom::PlaybackEventsRecorder implementation.
  31   void OnPlaying() final;
  32   void OnPaused() final;
  33   void OnSeeking() final;
  34   void OnEnded() final;
  35   void OnBuffering() final;
  36   void OnBufferingComplete() final;
  37   void OnError(const PipelineStatus& status) final;
  38   void OnNaturalSizeChanged(const gfx::Size& size) final;
  39   void OnPipelineStatistics(const PipelineStatistics& stats) final;
  40
  41  private:
  42   class BitrateEstimator {
  43    public:
  44     BitrateEstimator();
  45     ~BitrateEstimator();
  46
  47     void Update(const PipelineStatistics& stats);
  48     void OnPause();
  49
  50    private:
  51     base::TimeDelta time_elapsed_;
  52     size_t audio_bytes_ = 0;
  53     size_t video_bytes_ = 0;
  54
  55     absl::optional<PipelineStatistics> last_stats_;
  56     base::TimeTicks last_stats_time_;
  57   };
  58
  59   enum class BufferingState {
  60     kInitialBuffering,
  61     kBuffering,
  62     kBuffered,
  63   };
  64
  65   BufferingState buffering_state_ = BufferingState::kInitialBuffering;
  66   base::TimeTicks buffering_start_time_;
  67   base::TimeTicks last_buffering_end_time_;
  68
  69   BitrateEstimator bitrate_estimator_;
  70 };
  71
  72 }  // namespace media
  73
  74 #endif  // MEDIA_MOJO_SERVICES_PLAYBACK_EVENTS_RECORDER_H_