Source/WebCore/platform/encryptedmedia/CDMInstance.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 ENABLE(ENCRYPTED_MEDIA)

#include "CDMKeyStatus.h"
#include "CDMMessageType.h"
#include "CDMSessionType.h"
#include <utility>
#include <wtf/Forward.h>
#include <wtf/RefCounted.h>
#include <wtf/ThreadSafeRefCounted.h>
#include <wtf/TypeCasts.h>

namespace WebCore {

class SharedBuffer;

class CDMInstanceSession;
class ProxyCDM;

// Handle to a "real" CDM, not the JavaScript facade. This can be used
// from background threads (i.e. decryptors).
class ProxyCDM : public ThreadSafeRefCounted<ProxyCDM> {
public:
    virtual ~ProxyCDM() = default;
};

struct CDMKeySystemConfiguration;

// JavaScript's handle to a CDMInstance, must be used from the
// main-thread only!
class CDMInstance : public RefCounted<CDMInstance> {
public:
    virtual ~CDMInstance() = default;

    enum class ImplementationType {
        Mock,
        ClearKey,
        FairPlayStreaming,
    };
    virtual ImplementationType implementationType() const = 0;

    enum SuccessValue {
        Failed,
        Succeeded,
    };

    virtual SuccessValue initializeWithConfiguration(const CDMKeySystemConfiguration&) = 0;
    virtual SuccessValue setDistinctiveIdentifiersAllowed(bool) = 0;
    virtual SuccessValue setPersistentStateAllowed(bool) = 0;
    virtual SuccessValue setServerCertificate(Ref<SharedBuffer>&&) = 0;
    virtual SuccessValue setStorageDirectory(const String&) = 0;
    virtual const String& keySystem() const = 0;
    virtual RefPtr<CDMInstanceSession> createSession() = 0;
    virtual RefPtr<ProxyCDM> proxyCDM() const = 0;

    enum class HDCPStatus {
        Unknown,
        Valid,
        OutputRestricted,
        OutputDownscaled,
    };
    virtual SuccessValue setHDCPStatus(HDCPStatus) { return Failed; }
};

} // namespace WebCore

#define SPECIALIZE_TYPE_TRAITS_CDM_INSTANCE(ToValueTypeName, ImplementationTypeName) \
SPECIALIZE_TYPE_TRAITS_BEGIN(ToValueTypeName) \
static bool isType(const WebCore::CDMInstance& instance) { return instance.implementationType() == ImplementationTypeName; } \
SPECIALIZE_TYPE_TRAITS_END()

#endif