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- // Copyright 2014 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- #ifndef REMOTING_PROTOCOL_MONITORED_VIDEO_STUB_H_
- #define REMOTING_PROTOCOL_MONITORED_VIDEO_STUB_H_
- #include "base/callback.h"
- #include "base/memory/raw_ptr.h"
- #include "base/threading/thread_checker.h"
- #include "base/timer/timer.h"
- #include "remoting/protocol/video_stub.h"
- namespace base {
- class ThreadChecker;
- } // namespace base
- namespace remoting {
- namespace protocol {
- // MonitoredVideoStub is responsible for notifying the event handler if no
- // frames have been received within |connectivity_check_delay|.
- // The implementation uses the decorator pattern in which the MonitoredVideoStub
- // implements the same interface as the VideoStub. It overrides the
- // ProcessVideoPacket function to provide notification to the client when the
- // video channel is connected and forward the packet to the underlying
- // VideoStub. Multiple decorators can be stacked on top of each other if more
- // functionality is needed in the future.
- class MonitoredVideoStub : public VideoStub {
- public:
- // Callback to be called when channel state changes. The Callback should not
- // destroy the MonitoredVideoStub object.
- typedef base::RepeatingCallback<void(bool connected)> ChannelStateCallback;
- static const int kConnectivityCheckDelaySeconds = 2;
- MonitoredVideoStub(
- VideoStub* video_stub,
- base::TimeDelta connectivity_check_delay,
- const ChannelStateCallback& callback);
- MonitoredVideoStub(const MonitoredVideoStub&) = delete;
- MonitoredVideoStub& operator=(const MonitoredVideoStub&) = delete;
- ~MonitoredVideoStub() override;
- // VideoStub implementation.
- void ProcessVideoPacket(std::unique_ptr<VideoPacket> packet,
- base::OnceClosure done) override;
- private:
- void OnConnectivityCheckTimeout();
- void NotifyChannelState(bool connected);
- raw_ptr<VideoStub> video_stub_;
- ChannelStateCallback callback_;
- base::ThreadChecker thread_checker_;
- bool is_connected_;
- base::DelayTimer connectivity_check_timer_;
- };
- } // namespace protocol
- } // namespace remoting
- #endif // REMOTING_PROTOCOL_MONITORED_VIDEO_STUB_H_
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