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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 // be called back to back by repeated post tasks. Optionally, if specified, |
| 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 PauseRenderCallbacks(base::TimeTicks pause_until); |
| 43 |
| 44 void set_tick_clock_for_testing(base::TickClock* tick_clock) { |
| 45 tick_clock_ = tick_clock; |
| 46 } |
| 47 |
| 48 // Sets |stop_cb_|, which will be fired when Stop() is called. |
| 49 void set_stop_cb(const base::Closure& stop_cb) { |
| 50 stop_cb_ = stop_cb; |
| 51 } |
| 52 |
| 53 private: |
| 54 // Task that periodically calls Render() to consume video data. |
| 55 void CallRender(); |
| 56 |
| 57 const bool clockless_; |
| 58 const base::TimeDelta interval_; |
| 59 const NewFrameCB new_frame_cb_; |
| 60 scoped_refptr<base::SingleThreadTaskRunner> task_runner_; |
| 61 |
| 62 bool started_; |
| 63 RenderCallback* callback_; |
| 64 |
| 65 // Manages cancellation of periodic Render() callback task. |
| 66 base::CancelableClosure cancelable_worker_; |
| 67 |
| 68 // Used to determine when a new frame is received. |
| 69 scoped_refptr<VideoFrame> last_frame_; |
| 70 |
| 71 // Used to determine the interval given to RenderCallback::Render() as well as |
| 72 // to maintain stable periodicity of callbacks. |
| 73 base::TimeTicks current_render_time_; |
| 74 |
| 75 // Used to suspend Render() callbacks to |callback_| for some time. |
| 76 base::TimeTicks pause_end_time_; |
| 77 |
| 78 // Allow for an injectable tick clock for testing. |
| 79 base::DefaultTickClock default_tick_clock_; |
| 80 base::TimeTicks last_now_; |
| 81 |
| 82 // If specified, used instead of |default_tick_clock_|. |
| 83 base::TickClock* tick_clock_; |
| 84 |
| 85 // If set, called when Stop() is called. |
| 86 base::Closure stop_cb_; |
| 87 |
| 88 DISALLOW_COPY_AND_ASSIGN(NullVideoSink); |
| 89 }; |
| 90 |
| 91 } // namespace media |
| 92 |
| 93 #endif // MEDIA_AUDIO_NULL_VIDEO_SINK_H_ |
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