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/*
* ***** BEGIN GPL LICENSE BLOCK *****
*
* Copyright 2009-2011 Jörg Hermann Müller
*
* This file is part of AudaSpace.
*
* Audaspace is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* AudaSpace is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Audaspace; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* ***** END GPL LICENSE BLOCK *****
*/
/** \file audaspace/fftw/AUD_BandPassReader.cpp
* \ingroup audfftw
*/
#include "AUD_BandPassReader.h"
#include "AUD_Buffer.h"
#include <cstring>
#include <stdio.h>
AUD_BandPassReader::AUD_BandPassReader(AUD_IReader* reader, float low,
float high) :
AUD_EffectReader(reader), m_low(low), m_high(high)
{
m_buffer = new AUD_Buffer(); AUD_NEW("buffer")
m_in = new AUD_Buffer(); AUD_NEW("buffer")
m_out = new AUD_Buffer(); AUD_NEW("buffer")
m_length = 0;
}
AUD_BandPassReader::~AUD_BandPassReader()
{
if(m_length != 0)
{
fftw_destroy_plan(m_forward);
fftw_destroy_plan(m_backward);
}
delete m_buffer; AUD_DELETE("buffer")
delete m_in; AUD_DELETE("buffer")
delete m_out; AUD_DELETE("buffer")
}
AUD_ReaderType AUD_BandPassReader::getType()
{
return m_reader->getType();
}
void AUD_BandPassReader::read(int & length, sample_t* & buffer)
{
AUD_Specs specs = m_reader->getSpecs();
m_reader->read(length, buffer);
if(length > 0)
{
m_buffer->assureSize(length * AUD_SAMPLE_SIZE(specs));
if(length != m_length)
{
if(m_length != 0)
{
fftw_destroy_plan(m_forward);
fftw_destroy_plan(m_backward);
}
m_length = length;
if(m_length * sizeof(double) > m_in->getSize())
{
m_in->resize(m_length * sizeof(double));
m_out->resize((m_length / 2 + 1) * sizeof(fftw_complex));
}
m_forward = fftw_plan_dft_r2c_1d(m_length,
(double*)m_in->getBuffer(),
(fftw_complex*)m_out->getBuffer(),
FFTW_ESTIMATE);
m_backward = fftw_plan_dft_c2r_1d(m_length,
(fftw_complex*)m_out->getBuffer(),
(double*)m_in->getBuffer(),
FFTW_ESTIMATE);
}
double* target = (double*) m_in->getBuffer();
sample_t* target2 = m_buffer->getBuffer();
fftw_complex* complex = (fftw_complex*) m_out->getBuffer();
float frequency;
for(int channel = 0; channel < specs.channels; channel++)
{
for(int i = 0; i < m_length; i++)
target[i] = buffer[i * specs.channels + channel];
fftw_execute(m_forward);
for(int i = 0; i < m_length / 2 + 1; i++)
{
frequency = i * specs.rate / (m_length / 2.0f + 1.0f);
if((frequency < m_low) || (frequency > m_high))
complex[i][0] = complex[i][1] = 0.0;
}
fftw_execute(m_backward);
for(int i = 0; i < m_length; i++)
target2[i * specs.channels + channel] = target[i] / m_length;
}
}
buffer = m_buffer->getBuffer();
}
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