video_frame_scheduler_proxy.h revision 0529e5d033099cbfc42635f6f6183833b09dff6e 
1// Copyright 2014 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 MEDIA_FILTERS_VIDEO_FRAME_SCHEDULER_PROXY_H_
6#define MEDIA_FILTERS_VIDEO_FRAME_SCHEDULER_PROXY_H_
7
8#include "base/memory/weak_ptr.h"
9#include "media/filters/video_frame_scheduler.h"
10
11namespace base {
12class SingleThreadTaskRunner;
13}
14
15namespace media {
16
17// Provides a thread-safe proxy for a VideoFrameScheduler. Typical use is to
18// use a real VideoFrameScheduler on the task runner responsible for graphics
19// display and provide a proxy on the task runner responsible for background
20// video decoding.
21class MEDIA_EXPORT VideoFrameSchedulerProxy : public VideoFrameScheduler {
22 public:
23  // |task_runner| is the runner that this object will be called on.
24  // |scheduler_runner| is the runner that |scheduler| will be called on.
25  // |scheduler| must out-live the lifetime of this object.
26  VideoFrameSchedulerProxy(
27      const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
28      const scoped_refptr<base::SingleThreadTaskRunner>& scheduler_runner,
29      VideoFrameScheduler* scheduler);
30  virtual ~VideoFrameSchedulerProxy();
31
32  // VideoFrameScheduler implementation.
33  virtual void ScheduleVideoFrame(const scoped_refptr<VideoFrame>& frame,
34                                  base::TimeTicks wall_ticks,
35                                  const DoneCB& done_cb) OVERRIDE;
36  virtual void Reset() OVERRIDE;
37
38 private:
39  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
40  scoped_refptr<base::SingleThreadTaskRunner> scheduler_runner_;
41  VideoFrameScheduler* scheduler_;  // Not owned.
42
43  // NOTE: Weak pointers must be invalidated before all other member variables.
44  base::WeakPtrFactory<VideoFrameSchedulerProxy> weak_factory_;
45
46  DISALLOW_COPY_AND_ASSIGN(VideoFrameSchedulerProxy);
47};
48
49}  // namespace media
50
51#endif  // MEDIA_FILTERS_VIDEO_FRAME_SCHEDULER_PROXY_H_
52