AudioArray.h   [plain text]

/*
 * Copyright (C) 2010 Google 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 Computer, 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
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef AudioArray_h
#define AudioArray_h

#include <string.h>
#include <wtf/Vector.h>

namespace WebCore {

template<typename T>
class AudioArray : public Vector<T> {
public:
    AudioArray() : Vector<T>(0) { }
    explicit AudioArray(size_t n) : Vector<T>(n, 0) { }

    void zero() { memset(this->data(), 0, sizeof(T) * this->size()); }

    void zeroRange(unsigned start, unsigned end)
    {
        bool isSafe = (start <= end) && (end <= this->size());
        ASSERT(isSafe);
        if (!isSafe)
            return;

        memset(this->data() + start, 0, sizeof(T) * (end - start));
    }

    void copyToRange(T* sourceData, unsigned start, unsigned end)
    {
        bool isSafe = (start <= end) && (end <= this->size());
        ASSERT(isSafe);
        if (!isSafe)
            return;

        memcpy(this->data() + start, sourceData, sizeof(T) * (end - start));
    }
};

typedef AudioArray<float> AudioFloatArray;
typedef AudioArray<double> AudioDoubleArray;

} // WebCore

#endif // AudioArray_h