/*
 * Copyright (C) 2020 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.
 */

#include "config.h"
#include "SourceBufferParser.h"

#if ENABLE(MEDIA_SOURCE)

#include "ContentType.h"
#include "SharedBuffer.h"
#include "SourceBufferParserAVFObjC.h"
#include "SourceBufferParserWebM.h"
#include <pal/cocoa/MediaToolboxSoftLink.h>
#include <wtf/text/WTFString.h>

namespace WebCore {

MediaPlayerEnums::SupportsType SourceBufferParser::isContentTypeSupported(const ContentType& type)
{
    MediaPlayerEnums::SupportsType supports = MediaPlayerEnums::SupportsType::IsNotSupported;
    supports = std::max(supports, SourceBufferParserWebM::isContentTypeSupported(type));
    supports = std::max(supports, SourceBufferParserAVFObjC::isContentTypeSupported(type));
    return supports;
}

RefPtr<SourceBufferParser> SourceBufferParser::create(const ContentType& type, bool webMParserEnabled)
{
    if (SourceBufferParserWebM::isContentTypeSupported(type) != MediaPlayerEnums::SupportsType::IsNotSupported && webMParserEnabled)
        return adoptRef(new SourceBufferParserWebM());

    if (SourceBufferParserAVFObjC::isContentTypeSupported(type) != MediaPlayerEnums::SupportsType::IsNotSupported)
        return adoptRef(new SourceBufferParserAVFObjC());

    return nullptr;
}

static SourceBufferParser::CallOnClientThreadCallback callOnMainThreadCallback()
{
    return [](Function<void()>&& function) {
        callOnMainThread(WTFMove(function));
    };
}

void SourceBufferParser::setCallOnClientThreadCallback(CallOnClientThreadCallback&& callback)
{
    ASSERT(callback);
    m_callOnClientThreadCallback = WTFMove(callback);
}

SourceBufferParser::SourceBufferParser()
    : m_callOnClientThreadCallback(callOnMainThreadCallback())
{
}

void SourceBufferParser::setMinimumAudioSampleDuration(float)
{
}

SourceBufferParser::Segment::Segment(Ref<SharedBuffer>&& buffer)
    : m_segment(WTFMove(buffer))
{
}

#if HAVE(MT_PLUGIN_FORMAT_READER)
SourceBufferParser::Segment::Segment(RetainPtr<MTPluginByteSourceRef>&& segment)
    : m_segment(WTFMove(segment))
{
}
#endif

size_t SourceBufferParser::Segment::size() const
{
    return WTF::switchOn(m_segment,
#if HAVE(MT_PLUGIN_FORMAT_READER)
        [](const RetainPtr<MTPluginByteSourceRef>& byteSource)
        {
            return clampTo<size_t>(MTPluginByteSourceGetLength(byteSource.get()));
        },
#endif
        [](const Ref<SharedBuffer>& buffer)
        {
            return buffer->size();
        }
    );
}

size_t SourceBufferParser::Segment::read(size_t position, size_t sizeToRead, uint8_t* destination) const
{
    size_t segmentSize = size();
    sizeToRead = std::min(sizeToRead, segmentSize - std::min(position, segmentSize));
    return WTF::switchOn(m_segment,
#if HAVE(MT_PLUGIN_FORMAT_READER)
        [&](const RetainPtr<MTPluginByteSourceRef>& byteSource) -> size_t
        {
            size_t sizeRead = 0;
            if (MTPluginByteSourceRead(byteSource.get(), sizeToRead, CheckedInt64(position), destination, &sizeRead) != noErr)
                return 0;
            return sizeRead;
        },
#endif
        [&](const Ref<SharedBuffer>& buffer)
        {
            buffer->copyTo(destination, position, sizeToRead);
            return sizeToRead;
        }
    );
}

Ref<SharedBuffer> SourceBufferParser::Segment::takeSharedBuffer()
{
    return WTF::switchOn(m_segment,
#if HAVE(MT_PLUGIN_FORMAT_READER)
        [&](RetainPtr<MTPluginByteSourceRef>&)
        {
            Vector<uint8_t> vector(size());
            vector.shrink(read(0, vector.size(), vector.data()));
            return SharedBuffer::create(WTFMove(vector));
        },
#endif
        [&](Ref<SharedBuffer>& buffer)
        {
            return std::exchange(buffer, SharedBuffer::create());
        }
    );
}

RefPtr<SharedBuffer> SourceBufferParser::Segment::getSharedBuffer() const
{
    return WTF::switchOn(m_segment,
#if HAVE(MT_PLUGIN_FORMAT_READER)
        [&](const RetainPtr<MTPluginByteSourceRef>&) -> RefPtr<SharedBuffer>
        {
            return nullptr;
        },
#endif
        [&](const Ref<SharedBuffer>& buffer) -> RefPtr<SharedBuffer>
        {
            return buffer.ptr();
        }
    );
}

} // namespace WebCore

#endif // ENABLE(MEDIA_SOURCE)