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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef REMOTING_PROTOCOL_INPUT_EVENT_TIMESTAMPS_H_
#define REMOTING_PROTOCOL_INPUT_EVENT_TIMESTAMPS_H_
#include "base/memory/ref_counted.h"
#include "base/time/time.h"
namespace remoting::protocol {
// Used on the host side to track timestamps for input events.
struct InputEventTimestamps {
// Client-side timestamps. This value comes from the client clock, so it
// should not be used for any calculations on the host side (except in tests).
base::TimeTicks client_timestamp;
// Time when the event was processed by the host.
base::TimeTicks host_timestamp;
bool is_null() const { return client_timestamp.is_null(); }
};
// InputEventTimestampsSource is used by VideoStream implementations to get
// event timestamps that are sent back to the client as part of VideoStats
// message.
class InputEventTimestampsSource
: public base::RefCountedThreadSafe<InputEventTimestampsSource> {
public:
InputEventTimestampsSource() = default;
// Returns event timestamps for the input event that was received since the
// previous call. Null InputEventTimestamps value is returned if no input
// events were received. If multiple input events were received, then
// timestamps for the last one should be returned
virtual InputEventTimestamps TakeLastEventTimestamps() = 0;
protected:
friend base::RefCountedThreadSafe<InputEventTimestampsSource>;
virtual ~InputEventTimestampsSource() = default;
};
// Simple implementations of InputEventTimestampsSource that just stores the
// value provided to OnEventReceived().
class InputEventTimestampsSourceImpl : public InputEventTimestampsSource {
public:
InputEventTimestampsSourceImpl();
void OnEventReceived(InputEventTimestamps timestamps);
// InputEventTimestampsSource implementation.
InputEventTimestamps TakeLastEventTimestamps() override;
protected:
~InputEventTimestampsSourceImpl() override;
private:
InputEventTimestamps last_timestamps_;
};
} // namespace remoting::protocol
#endif // REMOTING_PROTOCOL_INPUT_EVENT_TIMESTAMPS_H_
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