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/*******************************************************************************
* Copyright 2015-2016 Juan Francisco Crespo Galán
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
******************************************************************************/
#include "fx/ImpulseResponse.h"
#include <algorithm>
#include <cstring>
#include <cstdlib>
#include <cmath>
AUD_NAMESPACE_BEGIN
ImpulseResponse::ImpulseResponse(std::shared_ptr<StreamBuffer> impulseResponse) :
ImpulseResponse(impulseResponse, std::make_shared<FFTPlan>(0.0))
{
}
ImpulseResponse::ImpulseResponse(std::shared_ptr<StreamBuffer> impulseResponse, std::shared_ptr<FFTPlan> plan)
{
auto reader = impulseResponse->createReader();
m_length = reader->getLength();
processImpulseResponse(impulseResponse->createReader(), plan);
}
Specs ImpulseResponse::getSpecs()
{
return m_specs;
}
int ImpulseResponse::getLength()
{
return m_length;
}
std::shared_ptr<std::vector<std::shared_ptr<std::vector<std::complex<sample_t>>>>> ImpulseResponse::getChannel(int n)
{
return m_processedIR[n];
}
void ImpulseResponse::processImpulseResponse(std::shared_ptr<IReader> reader, std::shared_ptr<FFTPlan> plan)
{
m_specs.channels = reader->getSpecs().channels;
m_specs.rate = reader->getSpecs().rate;
int N = plan->getSize();
bool eos = false;
int length = reader->getLength();
sample_t* buffer = (sample_t*)std::malloc(length * m_specs.channels * sizeof(sample_t));
int numParts = std::ceil((float)length / (plan->getSize() / 2));
for(int i = 0; i < m_specs.channels; i++)
{
m_processedIR.push_back(std::make_shared<std::vector<std::shared_ptr<std::vector<std::complex<sample_t>>>>>());
for(int j = 0; j < numParts; j++)
(*m_processedIR[i]).push_back(std::make_shared<std::vector<std::complex<sample_t>>>((N / 2) + 1));
}
length += reader->getSpecs().rate;
reader->read(length, eos, buffer);
void* bufferFFT = plan->getBuffer();
for(int i = 0; i < m_specs.channels; i++)
{
int partStart = 0;
for(int h = 0; h < numParts; h++)
{
int k = 0;
int len = std::min(partStart + ((N / 2)*m_specs.channels), length*m_specs.channels);
std::memset(bufferFFT, 0, ((N / 2) + 1) * 2 * sizeof(fftwf_complex));
for(int j = partStart; j < len; j += m_specs.channels)
{
((float*)bufferFFT)[k] = buffer[j + i];
k++;
}
plan->FFT(bufferFFT);
for(int j = 0; j < (N / 2) + 1; j++)
{
(*(*m_processedIR[i])[h])[j] = reinterpret_cast<std::complex<sample_t>*>(bufferFFT)[j];
}
partStart += N / 2 * m_specs.channels;
}
}
plan->freeBuffer(bufferFFT);
std::free(buffer);
}
AUD_NAMESPACE_END
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