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1 // Copyright 2015 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_AUDIO_NULL_VIDEO_SINK_H_ | |
6 #define MEDIA_AUDIO_NULL_VIDEO_SINK_H_ | |
7 | |
8 #include "base/cancelable_callback.h" | |
9 #include "base/md5.h" | |
10 #include "base/memory/scoped_ptr.h" | |
11 #include "base/time/default_tick_clock.h" | |
12 #include "base/time/tick_clock.h" | |
13 #include "media/base/video_renderer_sink.h" | |
14 | |
15 namespace base { | |
16 class SingleThreadTaskRunner; | |
17 } | |
18 | |
19 namespace media { | |
20 | |
21 class MEDIA_EXPORT NullVideoSink : NON_EXPORTED_BASE(public VideoRendererSink) { | |
22 public: | |
23 using NewFrameCB = base::Callback<void(const scoped_refptr<VideoFrame>&)>; | |
24 | |
25 // Periodically calls |callback| every |interval| on |task_runner| once the | |
26 // sink has been started. If |clockless| is true, the RenderCallback will | |
27 // called back to back by repeated post tasks. Optionally, if specified, | |
xhwang
2015/04/28 23:12:06
s/called/be called/
DaleCurtis
2015/04/29 00:54:07
Done.
| |
28 // |new_frame_cb| will be called for each new frame received. | |
29 NullVideoSink(bool clockless, | |
30 base::TimeDelta interval, | |
31 const NewFrameCB& new_frame_cb, | |
32 const scoped_refptr<base::SingleThreadTaskRunner>& task_runner); | |
33 ~NullVideoSink() override; | |
34 | |
35 // VideoRendererSink implementation. | |
36 void Start(RenderCallback* callback) override; | |
37 void Stop() override; | |
38 void PaintFrameUsingOldRenderingPath( | |
39 const scoped_refptr<VideoFrame>& frame) override; | |
40 | |
41 // Allows tests to simulate suspension of Render() callbacks. | |
42 void pause_callbacks(base::TimeTicks pause_util) { | |
xhwang
2015/04/28 23:12:06
s/pause_callbacks/PauseRenderCallbacks/?
DaleCurtis
2015/04/29 00:54:07
Done.
| |
43 pause_end_time_ = pause_util; | |
44 } | |
45 | |
46 void set_tick_clock_for_testing(base::TickClock* tick_clock) { | |
xhwang
2015/04/28 23:12:06
Use SetTickClockForTesting() since this is not str
xhwang
2015/04/28 23:12:06
Put comments here since this is the public interfa
DaleCurtis
2015/04/29 00:54:07
That doesn't apply to this case, the reason being
| |
47 tick_clock_ = tick_clock; | |
48 } | |
49 | |
50 void set_stop_callback(const base::Closure& stop_cb) { | |
xhwang
2015/04/28 23:12:06
set_stop_cb? Also add comment. It's not clear unle
DaleCurtis
2015/04/29 00:54:07
I prefer it spelled out for a method name. Added a
| |
51 stop_cb_ = stop_cb; | |
52 } | |
53 | |
54 private: | |
55 // Task that periodically calls Render() to consume audio data. | |
xhwang
2015/04/28 23:12:06
s/audio/video
DaleCurtis
2015/04/29 00:54:07
Done.
| |
56 void CallRender(); | |
57 | |
58 const bool clockless_; | |
59 const base::TimeDelta interval_; | |
60 const NewFrameCB new_frame_cb_; | |
61 scoped_refptr<base::SingleThreadTaskRunner> task_runner_; | |
62 | |
63 bool started_; | |
64 RenderCallback* callback_; | |
65 | |
66 // Manages cancelation of periodic Render() callback task. | |
67 base::CancelableClosure cancelable_worker_; | |
68 | |
69 // Used to determine when a new frame is received. | |
70 scoped_refptr<VideoFrame> last_frame_; | |
71 | |
72 // Used to determine the interval given to RenderCallback::Render() as well as | |
73 // to maintain stable periodicity of callbacks. | |
74 base::TimeTicks current_render_time_; | |
75 | |
76 // Used to suspend Render() callbacks to |callback_| for some time. | |
77 base::TimeTicks pause_end_time_; | |
78 | |
79 // If specified, used instead of base::TimeTicks::Now(). | |
xhwang
2015/04/28 23:12:06
This comment only applies to |tick_clock_|, right?
DaleCurtis
2015/04/29 00:54:07
Done.
| |
80 base::DefaultTickClock default_tick_clock_; | |
81 base::TickClock* tick_clock_; | |
82 base::TimeTicks last_now_; | |
83 | |
84 // If set, called when Stop() is called. | |
85 base::Closure stop_cb_; | |
86 | |
87 DISALLOW_COPY_AND_ASSIGN(NullVideoSink); | |
88 }; | |
89 | |
90 } // namespace media | |
91 | |
92 #endif // MEDIA_AUDIO_NULL_VIDEO_SINK_H_ | |
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