AudioSessionManager.h   [plain text]

/*
 * Copyright (C) 2013 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef AudioSessionManager_h
#define AudioSessionManager_h

#if USE(AUDIO_SESSION)

#include "AudioSession.h"
#include <wtf/HashCountedSet.h>
#include <wtf/PassOwnPtr.h>

namespace WebCore {

class AudioSessionManager {
public:
    static AudioSessionManager& sharedManager();

    enum AudioType {
        None,
        Video,
        Audio,
        WebAudio,
    };

    bool has(AudioType);

protected:
    friend class AudioSessionManagerToken;
    void incrementCount(AudioType);
    void decrementCount(AudioType);
    
private:
    AudioSessionManager();

    void updateSessionState();

    HashCountedSet<size_t> m_typeCount;
};

class AudioSessionManagerToken {
public:
    static PassOwnPtr<AudioSessionManagerToken> create(AudioSessionManager::AudioType);
    ~AudioSessionManagerToken();

private:
    AudioSessionManagerToken(AudioSessionManager::AudioType);

    AudioSessionManager::AudioType m_type;
};
}

#endif // USE(AUDIO_SESSION)

#endif // AudioSessionManager_h