forked from bartvdbraak/blender
128 lines
3.2 KiB
C++
128 lines
3.2 KiB
C++
/*
|
|
* ***** 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();
|
|
}
|