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