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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 "util/FFTPlan.h"
AUD_NAMESPACE_BEGIN
FFTPlan::FFTPlan(double measureTime) :
FFTPlan(DEFAULT_N, measureTime)
{
}
FFTPlan::FFTPlan(int n, double measureTime) :
m_N(n), m_bufferSize(((n/2)+1)*2*sizeof(fftwf_complex))
{
fftwf_set_timelimit(measureTime);
void* buf = fftwf_malloc(m_bufferSize);
m_fftPlanR2C = fftwf_plan_dft_r2c_1d(m_N, (float*)buf, (fftwf_complex*)buf, FFTW_EXHAUSTIVE);
m_fftPlanC2R = fftwf_plan_dft_c2r_1d(m_N, (fftwf_complex*)buf, (float*)buf, FFTW_EXHAUSTIVE);
fftwf_free(buf);
}
FFTPlan::~FFTPlan()
{
fftwf_destroy_plan(m_fftPlanC2R);
fftwf_destroy_plan(m_fftPlanR2C);
}
int FFTPlan::getSize()
{
return m_N;
}
void FFTPlan::FFT(void* buffer)
{
fftwf_execute_dft_r2c(m_fftPlanR2C, (float*)buffer, (fftwf_complex*)buffer);
}
void FFTPlan::IFFT(void* buffer)
{
fftwf_execute_dft_c2r(m_fftPlanC2R, (fftwf_complex*)buffer, (float*)buffer);
}
void* FFTPlan::getBuffer()
{
return fftwf_malloc(m_bufferSize);
}
void FFTPlan::freeBuffer(void* buffer)
{
fftwf_free(buffer);
}
AUD_NAMESPACE_END
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