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////////////////////////////////////////////////////////////////////////
// This file is part of the SndObj library
//
// This program 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.
//
// This program 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 this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
// Copyright (c)Victor Lazzarini, 1997-2004
// See License.txt for a disclaimer of all warranties
// and licensing information
#include "ImpulseTable.h"
ImpulseTable :: ImpulseTable() {
m_window = 0;
m_plan = rfftw_create_plan(m_L, FFTW_COMPLEX_TO_REAL, FFTW_ESTIMATE);
m_ffttmp = new float[m_L+1];
MakeTable();
}
ImpulseTable :: ImpulseTable(long L,
int segments, float start,
float* points, float* lengths,
float type,
Table* window,
float nyquistamp) :
SpecEnvTable(L,segments,start,points,lengths,type,nyquistamp)
{
m_window = window;
m_plan = rfftw_create_plan(m_L, FFTW_COMPLEX_TO_REAL, FFTW_ESTIMATE);
m_ffttmp = new float[m_L+1];
MakeTable();
}
ImpulseTable::~ImpulseTable(){
delete[] m_ffttmp;
rfftw_destroy_plan(m_plan);
}
short
ImpulseTable :: MakeTable(){
SpecEnvTable::MakeTable();
int i, i2;
// get input FFT frame and
// prepare data for fftw
m_ffttmp[0] = m_table[0];
m_ffttmp[m_L/2] = m_table[1];
for(i=2, i2=1; i<m_L; i+=2){
i2 = i/2;
m_ffttmp[i2] = m_table[i];
m_ffttmp[m_L-(i2)] = m_table[i+1];
}
// Inverse FFT function
rfftw_one(m_plan, m_ffttmp, m_table);
if(m_window && (m_window->GetLen() == m_L))
for(i=0; i<m_L; i++)
m_table[i] *= m_window->Lookup(i);
m_table[m_L] = m_table[m_L-1];
return 1;
}
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