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/*
* Copyright (C) 2012 Intel 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.
*/
#include "third_party/blink/renderer/platform/audio/direct_convolver.h"
#include <utility>
#include "build/build_config.h"
#include "third_party/blink/renderer/platform/audio/vector_math.h"
#if defined(OS_MACOSX)
#include <Accelerate/Accelerate.h>
#endif
#if defined(ARCH_CPU_X86_FAMILY) && !defined(OS_MACOSX)
#include <emmintrin.h>
#endif
namespace blink {
namespace {
using VectorMath::Conv;
using VectorMath::PrepareFilterForConv;
} // namespace
DirectConvolver::DirectConvolver(
size_t input_block_size,
std::unique_ptr<AudioFloatArray> convolution_kernel)
: input_block_size_(input_block_size),
buffer_(input_block_size * 2),
convolution_kernel_(std::move(convolution_kernel)) {
size_t kernel_size = ConvolutionKernelSize();
PrepareFilterForConv(convolution_kernel_->Data() + kernel_size - 1, -1,
kernel_size, &prepared_convolution_kernel_);
}
void DirectConvolver::Process(const float* source_p,
float* dest_p,
size_t frames_to_process) {
DCHECK_EQ(frames_to_process, input_block_size_);
if (frames_to_process != input_block_size_)
return;
// Only support kernelSize <= m_inputBlockSize
size_t kernel_size = ConvolutionKernelSize();
DCHECK_LE(kernel_size, input_block_size_);
if (kernel_size > input_block_size_)
return;
float* kernel_p = convolution_kernel_->Data();
// Sanity check
bool is_copy_good = kernel_p && source_p && dest_p && buffer_.Data();
DCHECK(is_copy_good);
if (!is_copy_good)
return;
float* input_p = buffer_.Data() + input_block_size_;
// Copy samples to 2nd half of input buffer.
memcpy(input_p, source_p, sizeof(float) * frames_to_process);
Conv(input_p - kernel_size + 1, 1, kernel_p + kernel_size - 1, -1, dest_p, 1,
frames_to_process, kernel_size, &prepared_convolution_kernel_);
// Copy 2nd half of input buffer to 1st half.
memcpy(buffer_.Data(), input_p, sizeof(float) * frames_to_process);
}
void DirectConvolver::Reset() {
buffer_.Zero();
}
} // namespace blink
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