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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
/////////////////////////////////////////////////
// PVA.cpp: Phase Vocoder Analysis class
//
// Victor Lazzarini, 2003
/////////////////////////////////////////////////
#include "PVA.h"
#include <cstring>
PVA::PVA(){
m_rotcount = 0;
m_phases = new float[m_halfsize];
memset(m_phases, 0, sizeof(float)*m_halfsize);
m_factor = m_sr/(m_hopsize*TWOPI);
}
PVA::PVA(Table* window, SndObj* input, float scale,
int fftsize, int hopsize, float sr)
:FFT(window, input, scale, fftsize, hopsize, sr)
{
m_rotcount = 0;
m_phases = new float[m_halfsize];
memset(m_phases, 0, sizeof(float)*m_halfsize);
m_factor = m_sr/(m_hopsize*TWOPI);
}
PVA::~PVA(){
delete[] m_phases;
}
int
PVA::Set(char* mess, float value){
switch(FindMsg(mess)){
case 22:
SetFFTSize((int) value);
return 1;
case 23:
SetHopSize((int) value);
return 1;
default:
return FFT::Set(mess, value);
}
}
void
PVA::SetFFTSize(int fftsize){
m_rotcount = 0;
FFT::SetFFTSize(fftsize);
}
void
PVA::SetHopSize(int hopsize){
m_rotcount = 0;
m_factor = m_sr/(hopsize*TWOPI);
FFT::SetFFTSize(hopsize);
}
void
PVA::pvanalysis(float* signal){
double re, im, pha, diff;
int i2;
rfftw_one(m_plan, signal, m_ffttmp);
m_output[0] = m_ffttmp[0]/m_norm;
m_output[1] = m_ffttmp[m_halfsize]/m_norm;
for(int i=2; i<m_fftsize; i+=2){
i2 = i/2;
re = m_ffttmp[i2]/m_norm;
im = m_ffttmp[m_fftsize-(i2)]/m_norm;
if((m_output[i] = sqrt((re*re)+(im*im)))==0.f){
diff = 0.f;
}
else {
pha = atan2(im,re);
diff = pha - m_phases[i2];
m_phases[i2] = (float) pha;
while(diff > PI) diff -= TWOPI;
while(diff < -PI) diff += TWOPI;
}
m_output[i+1] = (float) diff*m_factor + i2*m_fund;
}
}
short
PVA::DoProcess(){
if(!m_error){
if(m_input){
if(m_enable){
int i; float sig = 0.f;
for(m_vecpos = 0; m_vecpos < m_hopsize; m_vecpos++) {
// signal input
sig = m_input->Output(m_vecpos);
// distribute to the signal fftframes and apply the window
// according to a time pointer (kept by counter[n])
// input is also rotated according to the input time.
for(i=0;i < m_frames; i++){
m_sigframe[i][m_rotcount]= (float) sig*m_table->Lookup(m_counter[i]);
m_counter[i]++;
}
m_rotcount++;
}
m_rotcount %= m_fftsize;
// every vecsize samples
// set the current fftframe to be transformed
m_cur--; if(m_cur<0) m_cur = m_frames-1;
// phase vocoder analysis
pvanalysis(m_sigframe[m_cur]);
// zero the current fftframe time pointer
m_counter[m_cur] = 0;
return 1;
} else { // if disabled, reset the fftframes
for(m_vecpos =0; m_vecpos < m_hopsize; m_vecpos++)
m_output[m_vecpos] = 0.f;
return 1;
}
} else {
m_error = 3;
return 0;
}
}
else
return 0;
}
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