File: Oscil.cpp

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//************************************************************//
// Oscil.cpp : implementation of the Oscil base class         //
//                                                            //
//                                                            //
//                                                            //
//************************************************************//

#include "Oscil.h"
Oscil::Oscil(){

// initialise all values
m_ptable = 0;
m_fr = 440.f;
m_amp = 1.f;
m_inputamp = 0;
m_index = 0.f;
m_size = 0;

AddMsg("frequency", 21);
AddMsg("amplitude", 22);
AddMsg("phase", 23);
AddMsg("table", 24);
m_factor = m_size/m_sr;
                 }

Oscil::Oscil(Table* table, float fr, float amp,  
      SndObj* inputfreq, SndObj* inputamp, 
	      int vecsize, float sr) : 
SndObj(inputfreq, vecsize, sr) {


m_ptable =  table;
m_size = m_ptable->GetLen();
m_fr = fr;
m_amp = amp;
m_index = 0.f;

m_inputamp = inputamp;

AddMsg("frequency", 21);
AddMsg("amplitude", 22);
AddMsg("phase", 23);
AddMsg("table", 24);
m_factor = m_size/m_sr;
}

Oscil::~Oscil(){}

int
Oscil::Connect(char* mess, void* input){

	switch (FindMsg(mess)){

	case 21:
    m_input = (SndObj *) input;
	return 1;

	case 22:
	m_inputamp = (SndObj *) input;
    return 1;

	case 23:
	SetTable((Table *) input);
    return 1;

	default:
    return SndObj::Connect(mess,input);
     
	}


}

int 
Oscil::Set(char* mess, float value){

	switch (FindMsg(mess)){

    case 1:
	SetSr(value);
	return 1;

	case 21:
    SetFreq(value);
	return 1;

	case 22:
	SetAmp(value);
    return 1;

	case 23:
	SetPhase(value);
	return 1;

	default:
    return SndObj::Set(mess,value);
     
	}


}


short
Oscil :: DoProcess(){   
if(!m_error){
  float fr; 
  float amp; 
  if(!m_ptable){ 
    m_error = 1; // empty table object
    return 0;
                }
      // control signal sampled at a lower rate
    fr = m_fr + (m_input == 0 ? 0 : m_input->Output(0));
    amp = m_amp + (m_inputamp == 0 ? 0 : m_inputamp->Output(0));
   
      // wrapping loop
  for(m_vecpos = 0; m_vecpos < m_vecsize; m_vecpos++){
   if(m_enable){
   
    // truncating lookup
    m_output[m_vecpos] = amp*m_ptable->Lookup((int) m_index); 
    m_incr = (fr * m_factor);
    m_index += m_incr;           
  
   } else { // if disabled
         m_output[m_vecpos] = 0.f;
   }
   
  }  // end wrapping loop  
  
  if(m_index > m_size) m_index -= m_size;
  
  return 1;
}
 else return 0;
}



void 
Oscil::SetTable(Table* table){
m_ptable = table;
m_size = m_ptable->GetLen();
m_factor = m_size/m_sr;
}

short
Oscil::SetPhase(float phase){

if(m_ptable)
  {
m_index = m_size*phase;
return 1;
  }

else { 
  m_error = 2; // empty table
  return 0;
      }
}


void Oscil::SetSr(float sr)
{
	SndObj::SetSr(sr);
	m_factor = m_size/m_sr;
}