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// Copyright 2016 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 CONTENT_PUBLIC_BROWSER_MEDIA_SESSION_H_
#define CONTENT_PUBLIC_BROWSER_MEDIA_SESSION_H_
#include "base/macros.h"
#include "content/common/content_export.h"
namespace blink {
namespace mojom {
enum class MediaSessionAction;
} // namespace mojom
} // namespace blink
namespace content {
class MediaSessionObserver;
class WebContents;
// MediaSession manages the media session and audio focus for a given
// WebContents. There is only one MediaSession per WebContents.
//
// MediaSession allows clients to observe its changes via MediaSessionObserver,
// and allows clients to resume/suspend/stop the managed players.
class MediaSession {
public:
enum class SuspendType {
// Suspended by the system because a transient sound needs to be played.
SYSTEM,
// Suspended by the UI.
UI,
// Suspended by the page via script or user interaction.
CONTENT,
};
// Returns the MediaSession associated to this WebContents. Creates one if
// none is currently available.
CONTENT_EXPORT static MediaSession* Get(WebContents* contents);
virtual ~MediaSession() = default;
// Resume the media session.
// |type| represents the origin of the request.
virtual void Resume(SuspendType suspend_type) = 0;
// Resume the media session.
// |type| represents the origin of the request.
virtual void Suspend(SuspendType suspend_type) = 0;
// Resume the media session.
// |type| represents the origin of the request.
virtual void Stop(SuspendType suspend_type) = 0;
// Tell the media session a user action has performed.
virtual void DidReceiveAction(blink::mojom::MediaSessionAction action) = 0;
// Let the media session start ducking such that the volume multiplier is
// reduced.
virtual void StartDucking() = 0;
// Let the media session stop ducking such that the volume multiplier is
// recovered.
virtual void StopDucking() = 0;
protected:
MediaSession() = default;
private:
friend class MediaSessionObserver;
virtual void AddObserver(MediaSessionObserver* observer) = 0;
virtual void RemoveObserver(MediaSessionObserver* observer) = 0;
};
} // namespace content
#endif // CONTENT_PUBLIC_BROWSER_MEDIA_SESSION_H_
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