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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
/////////////////////////////////////////////////
// PVS.cpp : Phase Vocoder Synthesis Class
//
// Victor Lazzarini, 2003
//
/////////////////////////////////////////////////
#include "PVS.h"
PVS::PVS(){
m_rotcount = m_vecsize;
m_phases = new float[m_halfsize];
memset(m_phases, 0, sizeof(float)*m_halfsize);
m_factor = (m_hopsize*TWOPI)/m_sr;
m_first = true;
}
PVS::PVS(Table* window, SndObj* input, int fftsize,
int hopsize, float sr)
:IFFT(window, input,fftsize,hopsize,sr)
{
m_rotcount = m_vecsize;
if(m_halfsize){
m_phases = new float[m_halfsize];
memset(m_phases, 0, sizeof(float)*m_halfsize);
}
m_factor = (m_hopsize*TWOPI)/m_sr;
m_first = true;
}
PVS::~PVS(){
if(m_halfsize)
delete[] m_phases;
}
int
PVS::Set(char* mess, float value){
switch(FindMsg(mess)){
case 22:
SetFFTSize((int) value);
return 1;
case 23:
SetHopSize((int) value);
return 1;
default:
return IFFT::Set(mess, value);
}
}
void
PVS::SetFFTSize(int fftsize){
m_rotcount = m_vecsize;
IFFT::SetFFTSize(fftsize);
}
void
PVS::SetHopSize(int hopsize){
m_rotcount = m_vecsize;
m_factor = (m_hopsize*TWOPI)/m_sr;
IFFT::SetFFTSize(hopsize);
}
void
PVS::pvsynthesis(float* signal){
double pha;
int i2;
m_ffttmp[0] = m_input->Output(0);
m_ffttmp[m_halfsize] = m_input->Output(1);
for(int i=0;i<m_fftsize; i+=2){
i2 = i/2;
m_phases[i2] += m_input->Output(i+1) - m_fund*i2;
pha = m_phases[i2]*m_factor;
m_ffttmp[i2] = m_input->Output(i)*cos(pha);
m_ffttmp[m_fftsize-(i2)] = m_input->Output(i)*sin(pha);
}
rfftw_one(m_plan, m_ffttmp, signal);
}
short
PVS::DoProcess(){
if(!m_error){
if(m_input){
if(m_enable){
int i; float out = 0.;
// phase vocoder synthesis
if(m_first) {
for(m_vecpos = 0; m_vecpos < m_vecsize; m_vecpos++)
m_output[m_vecpos] = 0.f;
} else {
pvsynthesis(m_sigframe[m_cur]);
}
// set the current signal frame to the next
// one in the circular list
m_counter[m_cur] = 0;
m_cur++; if(m_cur==m_frames) m_cur = 0;
for(m_vecpos = 0; m_vecpos < m_vecsize; m_vecpos++){
// overlap-add the time-domain signal frames
// also make sure the frames are unrotated
for(i=0; i < m_frames; i++){
out += m_sigframe[i][m_rotcount]*m_table->Lookup(m_counter[i]);
m_counter[i]++;
}
m_rotcount++;
// output it.
m_output[m_vecpos] = (float) out;
out = 0.;
}
m_rotcount %= m_fftsize;
m_first = false;
return 1;
} else { // if disabled
for(m_vecpos = 0; m_vecpos < m_vecsize; m_vecpos++)
m_output[m_vecpos] = 0.f;
m_first = true;
return 1;
}
} else {
m_error = 3;
return 0;
}
}
else
return 0;
}
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