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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef ASH_WM_VIDEO_DETECTOR_H_
#define ASH_WM_VIDEO_DETECTOR_H_
#include <map>
#include <memory>
#include <set>
#include "ash/ash_export.h"
#include "ash/public/cpp/session/session_observer.h"
#include "ash/shell_observer.h"
#include "base/compiler_specific.h"
#include "base/observer_list.h"
#include "base/scoped_multi_source_observation.h"
#include "base/timer/timer.h"
#include "mojo/public/cpp/bindings/receiver.h"
#include "services/viz/public/mojom/compositing/video_detector_observer.mojom.h"
#include "ui/aura/env_observer.h"
#include "ui/aura/window.h"
#include "ui/aura/window_observer.h"
namespace ash {
// Receives notifications from viz::VideoDetector about whether it is likely
// that a video is being played on screen. If video activity is detected, this
// class will classify it as full screen or windowed.
class ASH_EXPORT VideoDetector : public aura::EnvObserver,
public aura::WindowObserver,
public SessionObserver,
public ShellObserver,
public viz::mojom::VideoDetectorObserver {
public:
// State of detected video activity.
enum class State {
// Video activity has been detected recently and there are no fullscreen
// windows.
PLAYING_WINDOWED,
// Video activity has been detected recently and there is at least one
// fullscreen window.
PLAYING_FULLSCREEN,
// Video activity has not been detected recently.
NOT_PLAYING,
};
class Observer {
public:
// Invoked when the video playback state has changed.
virtual void OnVideoStateChanged(VideoDetector::State state) = 0;
protected:
virtual ~Observer() {}
};
VideoDetector();
VideoDetector(const VideoDetector&) = delete;
VideoDetector& operator=(const VideoDetector&) = delete;
~VideoDetector() override;
State state() const { return state_; }
void AddObserver(Observer* observer);
void RemoveObserver(Observer* observer);
// EnvObserver overrides.
void OnWindowInitialized(aura::Window* window) override;
// aura::WindowObserver overrides.
void OnWindowDestroyed(aura::Window* window) override;
void OnWindowDestroying(aura::Window* window) override;
// SessionStateController overrides.
void OnChromeTerminating() override;
// ShellObserver overrides.
void OnFullscreenStateChanged(bool is_fullscreen,
aura::Window* container) override;
// viz::mojom::VideoDetectorObserver implementation.
void OnVideoActivityStarted() override;
void OnVideoActivityEnded() override;
private:
// Updates |state_| and notifies |observers_| if it changed.
void UpdateState();
// Connects to Viz and starts observing video activities.
void EstablishConnectionToViz();
// Called when connection to Viz is lost. The connection will be
// re-established after a short delay.
void OnConnectionError();
// Current playback state.
State state_;
// True if video has been observed in the last |kVideoTimeoutMs|.
bool video_is_playing_;
// Currently-fullscreen desks containers windows.
std::set<aura::Window*> fullscreen_desks_containers_;
base::ObserverList<Observer>::Unchecked observers_;
base::ScopedMultiSourceObservation<aura::Window, aura::WindowObserver>
window_observations_manager_{this};
ScopedSessionObserver scoped_session_observer_{this};
bool is_shutting_down_;
mojo::Receiver<viz::mojom::VideoDetectorObserver> receiver_{this};
base::WeakPtrFactory<VideoDetector> weak_factory_{this};
};
} // namespace ash
#endif // ASH_WM_VIDEO_DETECTOR_H_
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