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| 1 // Copyright 2016 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 REMOTING_PROTOCOL_INPUT_EVENT_TIMESTAMPS_H_ |
| 6 #define REMOTING_PROTOCOL_INPUT_EVENT_TIMESTAMPS_H_ |
| 7 |
| 8 #include "base/memory/ref_counted.h" |
| 9 #include "base/time/time.h" |
| 10 |
| 11 namespace remoting { |
| 12 namespace protocol { |
| 13 |
| 14 // Used on the host side to track timestamps for input events. |
| 15 struct InputEventTimestamps { |
| 16 // Client-side timestamps. This value comes from the client clock, so it |
| 17 // should not be used for any calculations on the host side (except in tests). |
| 18 base::TimeTicks client_timestamp; |
| 19 |
| 20 // Time when the event was processed by the host. |
| 21 base::TimeTicks host_timestamp; |
| 22 |
| 23 bool is_null() { return client_timestamp.is_null(); } |
| 24 }; |
| 25 |
| 26 // InputEventTimestampsSource is used by VideoStream implementations to get |
| 27 // event timestamps that are sent back to the client as part of VideoStats |
| 28 // message. |
| 29 class InputEventTimestampsSource |
| 30 : public base::RefCountedThreadSafe<InputEventTimestampsSource> { |
| 31 public: |
| 32 InputEventTimestampsSource() {} |
| 33 |
| 34 // Returns event timestamps for the input event that was received since the |
| 35 // previous call. Null InputEventTimestamps value is returned if no input |
| 36 // events were received. If multiple input events were received, then |
| 37 // timestamps for the last one should be returned |
| 38 virtual InputEventTimestamps TakeLastEventTimestamps() = 0; |
| 39 |
| 40 protected: |
| 41 friend base::RefCountedThreadSafe<InputEventTimestampsSource>; |
| 42 virtual ~InputEventTimestampsSource() {} |
| 43 }; |
| 44 |
| 45 // Simple implementations of InputEventTimestampsSource that just stores the |
| 46 // value provided to OnEventReceived(). |
| 47 class InputEventTimestampsSourceImpl : public InputEventTimestampsSource { |
| 48 public: |
| 49 InputEventTimestampsSourceImpl(); |
| 50 |
| 51 void OnEventReceived(InputEventTimestamps timestamps); |
| 52 |
| 53 // InputEventTimestampsSource implementation. |
| 54 InputEventTimestamps TakeLastEventTimestamps() override; |
| 55 |
| 56 protected: |
| 57 ~InputEventTimestampsSourceImpl() override; |
| 58 |
| 59 private: |
| 60 InputEventTimestamps last_timestamps_; |
| 61 }; |
| 62 |
| 63 } // namespace protocol |
| 64 } // namespace remoting |
| 65 |
| 66 #endif // REMOTING_PROTOCOL_INPUT_EVENT_TIMESTAMPS_H_ |
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