File: AdSyn.cpp

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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 "AdSyn.h"

#include <cstring>

AdSyn::AdSyn(){

}

AdSyn::AdSyn(SinAnal* input, int maxtracks, Table* table,
	     float pitch, float scale, int vecsize, float sr)	  
  :ReSyn(input, maxtracks, table, pitch, scale, 1.f, vecsize, sr){


}
AdSyn::~AdSyn(){
}


short
AdSyn::DoProcess() {
	
  if(m_input){
		
    float ampnext,amp,freq,freqnext,phase;
    int i3, i, j, ID, track;
    int notcontin = 0;
    bool contin = false;
    int oldtracks = m_tracks;
    float* tab = m_ptable->GetTable(); 
    if((m_tracks = ((SinAnal *)m_input)->GetTracks()) >
       m_maxtracks) m_tracks = m_maxtracks;
		
    memset(m_output, 0, sizeof(float)*m_vecsize);
		
    // for each track
    i = j = 0;
    while(i < m_tracks*3){
			
      i3 = i/3;
      ampnext =  m_input->Output(i)*m_scale;
      freqnext = m_input->Output(i+1)*m_pitch; 
      ID = ((SinAnal *)m_input)->GetTrackID(i3);

      j = i3+notcontin;
    
   			
      if(i3 < oldtracks-notcontin){

        
	if(m_trackID[j]==ID){	
	  // if this is a continuing track  	
	  track = j;
	  contin = true;	
	  freq = m_freqs[track];
	  phase = m_phases[track];
	  amp = m_amps[track];
					
	}
	else {
	  // if this is  a dead track
	  contin = false;
	  track = j;
	  freqnext = freq = m_freqs[track];
	  phase = m_phases[track];
	  amp = m_amps[track]; 
	  ampnext = 0.f;
	}
      }			
      else{ 
	// new tracks
	contin = true;
	track = -1;
	freq = freqnext;
	phase = -freq*m_factor;
	amp = 0.f;
      }
		
      // interpolation & track synthesis loop
      float a,f,frac,incra,incrph;
      int ndx;
      a = amp;
      f = freq;
      incra = (ampnext - amp)/m_vecsize;
      incrph = (freqnext - freq)/m_vecsize;
      for(m_vecpos=0; m_vecpos < m_vecsize; m_vecpos++){
	if(m_enable) {    
	  // table lookup oscillator
	  phase += f*m_ratio;
	  while(phase < 0) phase += m_size;
	  while(phase >= m_size) phase -= m_size;
	  ndx = Ftoi(phase);
	  frac = phase -  ndx;
	  m_output[m_vecpos] += a*(tab[ndx] + (tab[ndx+1] - tab[ndx])*frac);
	  a += incra;
	  f += incrph;
	}
	else m_output[m_vecpos] = 0.f;		
      }

      // keep amp, freq, and phase values for next time
      if(contin){
	m_amps[i3] = ampnext;
	m_freqs[i3] = freqnext;
	m_phases[i3] = phase;
	m_trackID[i3] = ID;    
	i += 3;
      } else notcontin++;
    } 
    return 1;
  }
  else {
    m_error  = 1;
    return 0;
  }
 
}