Source/WebKit/Shared/Cocoa/SharedRingBufferStorage.h

/*
 * Copyright (C) 2017 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.
 */

#pragma once

#if USE(MEDIATOOLBOX)

#include "SharedMemory.h"
#include <WebCore/CARingBuffer.h>

namespace WebKit {

class SharedRingBufferStorage : public WebCore::CARingBufferStorage {
public:
    class Client {
    public:
        virtual ~Client() = default;
        virtual void storageChanged(SharedMemory*) = 0;
    };

    SharedRingBufferStorage(Client* client)
        : m_client(client)
    {
    }

    void invalidate() { m_client = nullptr; }

    RefPtr<SharedMemory> storage() const { return m_storage; }
    void setStorage(RefPtr<SharedMemory>&&);

    bool readOnly() const { return m_readOnly; }
    void setReadOnly(bool);

    // WebCore::CARingBufferStorage
    void allocate(size_t) final;
    void deallocate() final;
    void* data() final;

private:
    Client* m_client;
    RefPtr<SharedMemory> m_storage;
    bool m_readOnly { false };
};

}

#endif