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
14namespace base {
15class MessageLoopProxy;
16}
17
18namespace 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).
25class CONTENT_EXPORT RenderMediaLog : public media::MediaLog {
26 public:
27  RenderMediaLog();
28
29  // MediaLog implementation.
30  virtual 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  virtual ~RenderMediaLog();
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_
52