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/*
* Copyright (C) 2010 Google Inc. All rights reserved.
* Copyright (C) 2024 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.
*/
#ifndef AudioArray_h
#define AudioArray_h
#include <span>
#include <string.h>
#include <wtf/CheckedArithmetic.h>
#include <wtf/MallocSpan.h>
#include <wtf/StdLibExtras.h>
namespace WebCore {
template<typename T>
class AudioArray {
WTF_MAKE_TZONE_ALLOCATED_TEMPLATE(AudioArray);
public:
AudioArray() = default;
explicit AudioArray(size_t n)
{
resize(n);
}
~AudioArray() = default;
// It's OK to call resize() multiple times, but data will *not* be copied from an initial allocation
// if re-allocated. Allocations are zero-initialized.
void resize(Checked<size_t> n)
{
if (n == size())
return;
Checked<size_t> initialSize = sizeof(T) * n;
#if USE(GSTREAMER)
m_allocation = MallocSpan<T>::zeroedMalloc(initialSize);
#else
// Accelerate.framework behaves differently based on input vector alignment. And each implementation
// has very small difference in output! We ensure 32byte alignment so that we will always take the most
// optimized implementation if possible, which makes the result deterministic.
constexpr size_t alignment = 32;
m_allocation = MallocSpan<T, FastAlignedMalloc>::alignedMalloc(alignment, initialSize);
zero();
#endif
}
std::span<T> span() { return m_allocation.mutableSpan(); }
std::span<const T> span() const { return m_allocation.span(); }
T* data() { return span().data(); }
const T* data() const { return span().data(); }
size_t size() const { return span().size(); }
bool isEmpty() const { return span().empty(); }
T& at(size_t i) { return m_allocation[i]; }
const T& at(size_t i) const { return m_allocation[i]; }
T& operator[](size_t i) { return at(i); }
const T& operator[](size_t i) const { return at(i); }
void zero() { zeroSpan(span()); }
void zeroRange(unsigned start, unsigned end)
{
bool isSafe = (start <= end) && (end <= size());
ASSERT(isSafe);
if (!isSafe)
return;
// This expression cannot overflow because end - start cannot be
// greater than m_size, which is safe due to the check in resize().
zeroSpan(span().subspan(start, end - start));
}
void copyToRange(std::span<const T> sourceData, unsigned start, unsigned end)
{
bool isSafe = (start <= end) && (end <= size());
ASSERT(isSafe);
if (!isSafe)
return;
// This expression cannot overflow because end - start cannot be
// greater than m_size, which is safe due to the check in resize().
memcpySpan(this->span().subspan(start), sourceData.first(end - start));
}
bool containsConstantValue() const
{
if (size() <= 1)
return true;
float constant = m_allocation[0];
for (auto& value : span().subspan(1)) {
if (value != constant)
return false;
}
return true;
}
private:
#if USE(GSTREAMER)
MallocSpan<T> m_allocation;
#else
MallocSpan<T, FastAlignedMalloc> m_allocation;
#endif
};
WTF_MAKE_TZONE_ALLOCATED_TEMPLATE_IMPL(template<typename T>, AudioArray<T>);
typedef AudioArray<float> AudioFloatArray;
typedef AudioArray<double> AudioDoubleArray;
} // WebCore
#endif // AudioArray_h
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