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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/macros.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::Callback<void(bool connected)> ChannelStateCallback;
static const int kConnectivityCheckDelaySeconds = 2;
MonitoredVideoStub(
VideoStub* video_stub,
base::TimeDelta connectivity_check_delay,
const ChannelStateCallback& callback);
~MonitoredVideoStub() override;
// VideoStub implementation.
void ProcessVideoPacket(scoped_ptr<VideoPacket> packet,
const base::Closure& done) override;
private:
void OnConnectivityCheckTimeout();
void NotifyChannelState(bool connected);
VideoStub* video_stub_;
ChannelStateCallback callback_;
base::ThreadChecker thread_checker_;
bool is_connected_;
base::DelayTimer connectivity_check_timer_;
DISALLOW_COPY_AND_ASSIGN(MonitoredVideoStub);
};
} // namespace protocol
} // namespace remoting
#endif // REMOTING_PROTOCOL_MONITORED_VIDEO_STUB_H_