MIMETypeCache.cpp   [plain text]

/*
 * Copyright (C) 2019 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. ``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
 * 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. 
 */

#include "config.h"
#include "MIMETypeCache.h"

#include "ContentType.h"

namespace WebCore {

HashSet<String, ASCIICaseInsensitiveHash>& MIMETypeCache::supportedTypes()
{
    if (!m_supportedTypes) {
        m_supportedTypes = HashSet<String, ASCIICaseInsensitiveHash>();
        initializeCache(*m_supportedTypes);
    }

    return *m_supportedTypes;
}

bool MIMETypeCache::supportsContainerType(const String& containerType)
{
    if (!isAvailable() || containerType.isEmpty())
        return false;

    if (staticContainerTypeList().contains(containerType))
        return true;

    return supportedTypes().contains(containerType);
}

MediaPlayerEnums::SupportsType MIMETypeCache::canDecodeType(const String& mimeType)
{
    if (!isAvailable() || mimeType.isEmpty())
        return MediaPlayerEnums::SupportsType::IsNotSupported;

    if (m_cachedResults) {
        auto it = m_cachedResults->find(mimeType);
        if (it != m_cachedResults->end())
            return it->value;
    }

    auto result = canDecodeTypePrivate(mimeType);
    if (!m_cachedResults)
        m_cachedResults = HashMap<String, MediaPlayerEnums::SupportsType, ASCIICaseInsensitiveHash>();
    m_cachedResults->add(mimeType, result);

    return result;
}

MediaPlayerEnums::SupportsType MIMETypeCache::canDecodeTypePrivate(const String& mimeType)
{
    ASSERT(isAvailable() && !mimeType.isEmpty());

    auto contentType = ContentType { mimeType };
    auto containerType = contentType.containerType();

    if (isUnsupportedContainerType(containerType))
        return MediaPlayerEnums::SupportsType::IsNotSupported;

    if (!supportsContainerType(containerType))
        return MediaPlayerEnums::SupportsType::IsNotSupported;

    if (!contentType.codecs().isEmpty() && canDecodeTypeInternal(contentType))
        return MediaPlayerEnums::SupportsType::IsSupported;

    return MediaPlayerEnums::SupportsType::MayBeSupported;
}

void MIMETypeCache::addSupportedTypes(const Vector<String>& newTypes)
{
    auto& storage = supportedTypes();
    for (auto& type : newTypes)
        storage.add(type);
}

void MIMETypeCache::addSupportedType(const String& type)
{
    supportedTypes().add(type);
}

const HashSet<String, ASCIICaseInsensitiveHash>& MIMETypeCache::staticContainerTypeList()
{
    static const auto cache = makeNeverDestroyed(HashSet<String, ASCIICaseInsensitiveHash> { });
    return cache;
}

}