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 base {
  15 class MessageLoopProxy;
  16 }
  17
  18 namespace content {
  19
  20 // RenderMediaLog is an implementation of MediaLog that forwards events to the
  21 // browser process, throttling as necessary.
  22 //
  23 // To minimize the number of events sent over the wire, only the latest event
  24 // added is sent for high frequency events (e.g., BUFFERED_EXTENTS_CHANGED).
  25 class CONTENT_EXPORT RenderMediaLog : public media::MediaLog {
  26  public:
  27   RenderMediaLog();
  28
  29   // MediaLog implementation.
  30   void AddEvent(scoped_ptr<media::MediaLogEvent> event) override;
  31
  32   // Will reset |last_ipc_send_time_| with the value of NowTicks().
  33   void SetTickClockForTesting(scoped_ptr<base::TickClock> tick_clock);
  34
  35  private:
  36   ~RenderMediaLog() override;
  37
  38   scoped_refptr<base::MessageLoopProxy> render_loop_;
  39   scoped_ptr<base::TickClock> tick_clock_;
  40   base::TimeTicks last_ipc_send_time_;
  41   std::vector<media::MediaLogEvent> queued_media_events_;
  42
  43   // Limits the number buffered extents changed events we send over IPC to one.
  44   scoped_ptr<media::MediaLogEvent> last_buffered_extents_changed_event_;
  45
  46   DISALLOW_COPY_AND_ASSIGN(RenderMediaLog);
  47 };
  48
  49 }  // namespace content
  50
  51 #endif  // CONTENT_RENDERER_MEDIA_RENDER_MEDIA_LOG_H_