content/renderer/media/render_media_log.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   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 CONTENT_RENDERER_MEDIA_RENDER_MEDIA_LOG_H_
   6 #define CONTENT_RENDERER_MEDIA_RENDER_MEDIA_LOG_H_
   7
   8 #include <vector>
   9
  10 #include "base/time/time.h"
  11 #include "content/common/content_export.h"
  12 #include "media/base/media_log.h"
  13
  14 namespace content {
  15
  16 // RenderMediaLog is an implementation of MediaLog that forwards events to the
  17 // browser process, throttling as necessary.
  18 //
  19 // To minimize the number of events sent over the wire, only the latest event
  20 // added is sent for high frequency events (e.g., BUFFERED_EXTENTS_CHANGED).
  21 //
  22 // It must be constructed on the render thread.
  23 class CONTENT_EXPORT RenderMediaLog : public media::MediaLog {
  24  public:
  25   RenderMediaLog();
  26
  27   // MediaLog implementation.
  28   void AddEvent(scoped_ptr<media::MediaLogEvent> event) override;
  29
  30   // Will reset |last_ipc_send_time_| with the value of NowTicks().
  31   void SetTickClockForTesting(scoped_ptr<base::TickClock> tick_clock);
  32   void SetTaskRunnerForTesting(
  33       const scoped_refptr<base::SingleThreadTaskRunner>& task_runner);
  34
  35  private:
  36   ~RenderMediaLog() override;
  37
  38   // Add event on the |task_runner_|.
  39   void AddEventInternal(scoped_ptr<media::MediaLogEvent> event);
  40
  41   // Posted as a delayed task to throttle ipc message frequency.
  42   void SendQueuedMediaEvents();
  43
  44   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
  45   scoped_ptr<base::TickClock> tick_clock_;
  46   base::TimeTicks last_ipc_send_time_;
  47   std::vector<media::MediaLogEvent> queued_media_events_;
  48
  49   // Limits the number buffered extents changed events we send over IPC to one.
  50   scoped_ptr<media::MediaLogEvent> last_buffered_extents_changed_event_;
  51
  52   DISALLOW_COPY_AND_ASSIGN(RenderMediaLog);
  53 };
  54
  55 }  // namespace content
  56
  57 #endif  // CONTENT_RENDERER_MEDIA_RENDER_MEDIA_LOG_H_