AudioFileReaderCocoa.cpp   [plain text]

/*
 * Copyright (C) 2010 Google Inc. All rights reserved.
 * Copyright (C) 2011-2021 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.
 * 3.  Neither the name of Apple Inc. ("Apple") nor the names of
 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE 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 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"

#if ENABLE(WEB_AUDIO)
#include "AudioFileReaderCocoa.h"

#include <wtf/FastMalloc.h>

namespace WebCore {

AudioBufferList* tryCreateAudioBufferList(size_t numberOfBuffers)
{
    CheckedSize bufferListSize = sizeof(AudioBufferList) - sizeof(AudioBuffer);
    bufferListSize += numberOfBuffers * sizeof(AudioBuffer);
    if (bufferListSize.hasOverflowed())
        return nullptr;

    auto allocated = tryFastCalloc(1, bufferListSize.unsafeGet());
    AudioBufferList* bufferList;
    if (!allocated.getValue(bufferList))
        return nullptr;

    bufferList->mNumberBuffers = numberOfBuffers;
    return bufferList;
}

void destroyAudioBufferList(AudioBufferList* bufferList)
{
    fastFree(bufferList);
}

bool validateAudioBufferList(AudioBufferList* bufferList)
{
    if (!bufferList)
        return false;

    Optional<unsigned> expectedDataSize;
    const AudioBuffer* buffer = bufferList->mBuffers;
    const AudioBuffer* bufferEnd = buffer + bufferList->mNumberBuffers;
    for ( ; buffer < bufferEnd; ++buffer) {
        if (!buffer->mData)
            return false;

        unsigned dataSize = buffer->mDataByteSize;
        if (!expectedDataSize)
            expectedDataSize = dataSize;
        else if (*expectedDataSize != dataSize)
            return false;
    }
    return true;
}

}

#endif // ENABLE(WEB_AUDIO)