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/*
* 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
* 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 THIRD_PARTY_BLINK_RENDERER_PLATFORM_AUDIO_AUDIO_ARRAY_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_AUDIO_AUDIO_ARRAY_H_
#include <string.h>
#include "base/macros.h"
#include "base/numerics/checked_math.h"
#include "build/build_config.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
#include "third_party/blink/renderer/platform/wtf/allocator/partitions.h"
namespace blink {
template <typename T>
class AudioArray {
USING_FAST_MALLOC(AudioArray);
public:
AudioArray() : allocation_(nullptr), aligned_data_(nullptr), size_(0) {}
explicit AudioArray(size_t n)
: allocation_(nullptr), aligned_data_(nullptr), size_(0) {
Allocate(n);
}
~AudioArray() { WTF::Partitions::FastFree(allocation_); }
// It's OK to call Allocate() multiple times, but data will *not* be copied
// from an initial allocation if re-allocated. Allocations are
// zero-initialized.
void Allocate(size_t n) {
// Although n is a size_t, its true limit is max unsigned because we use
// unsigned in zeroRange() and copyToRange(). Also check for integer
// overflow.
CHECK_LE(n, std::numeric_limits<unsigned>::max() / sizeof(T));
uint32_t initial_size = static_cast<uint32_t>(sizeof(T) * n);
// Minimmum alignment requirements for arrays so that we can use
// SIMD.
#if defined(ARCH_CPU_X86_FAMILY) || defined(WTF_USE_WEBAUDIO_FFMPEG)
const unsigned kAlignment = 32;
#else
const unsigned kAlignment = 16;
#endif
if (allocation_)
WTF::Partitions::FastFree(allocation_);
// Always allocate extra space so that we are guaranteed to get
// the desired alignment. Some memory is wasted, but it should be
// small since most arrays are probably at least 128 floats (or
// doubles).
unsigned total = base::CheckAdd(initial_size, kAlignment).ValueOrDie();
allocation_ = static_cast<T*>(WTF::Partitions::FastZeroedMalloc(
total, WTF_HEAP_PROFILER_TYPE_NAME(AudioArray<T>)));
CHECK(allocation_);
aligned_data_ = AlignedAddress(allocation_, kAlignment);
size_ = static_cast<uint32_t>(n);
}
T* Data() { return aligned_data_; }
const T* Data() const { return aligned_data_; }
uint32_t size() const { return size_; }
T& at(size_t i) {
// Note that although it is a size_t, m_size is now guaranteed to be
// no greater than max unsigned. This guarantee is enforced in Allocate().
SECURITY_DCHECK(i < size());
return Data()[i];
}
T& operator[](size_t i) { return at(i); }
void Zero() {
// This multiplication is made safe by the check in Allocate().
memset(this->Data(), 0, sizeof(T) * this->size());
}
void ZeroRange(unsigned start, unsigned end) {
bool is_safe = (start <= end) && (end <= this->size());
DCHECK(is_safe);
if (!is_safe)
return;
// This expression cannot overflow because end - start cannot be
// greater than m_size, which is safe due to the check in Allocate().
memset(this->Data() + start, 0, sizeof(T) * (end - start));
}
void CopyToRange(const T* source_data, unsigned start, unsigned end) {
bool is_safe = (start <= end) && (end <= this->size());
DCHECK(is_safe);
if (!is_safe)
return;
// This expression cannot overflow because end - start cannot be
// greater than m_size, which is safe due to the check in Allocate().
memcpy(this->Data() + start, source_data, sizeof(T) * (end - start));
}
private:
// Return an address that is aligned to an |alignment| boundary.
// |alignment| MUST be a power of two!
static T* AlignedAddress(T* address, intptr_t alignment) {
intptr_t value = reinterpret_cast<intptr_t>(address);
return reinterpret_cast<T*>((value + alignment - 1) & ~(alignment - 1));
}
T* allocation_;
T* aligned_data_;
uint32_t size_;
DISALLOW_COPY_AND_ASSIGN(AudioArray);
};
typedef AudioArray<float> AudioFloatArray;
typedef AudioArray<double> AudioDoubleArray;
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_AUDIO_AUDIO_ARRAY_H_
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