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//
// Programmer:    Craig Stuart Sapp <craig@ccrma.stanford.edu>
// Creation Date: Sat Nov  2 10:25:09 PST 1996
// Last Modified: Wed Nov 19 01:11:38 GMT-0800 1997
// Filename:      ...sig/doc/examples/sig/sigfile/ring/ring.cpp
// Syntax:        C++; sig
//
// Description:   a ring modulator
//

#include "sigAudio.h"

#ifndef OLDCPP
   #include <iostream>
   using namespace std;
#else
   #include <iostream.h>
#endif

void exitUsage(const char* command);


int main(int argc, char* argv[]) {
   char* freqenv = NULL;
   char* ampenv = NULL;
   char* infile = NULL;
   char* outfile = NULL;

   if (argc == 5) {
      freqenv = argv[1];
      ampenv = argv[2];
      infile = argv[3];
      outfile = argv[4];
   } else if (argc == 4) {
      freqenv = argv[1];
      ampenv = "(0 1; 1 1)";
      infile = argv[2];
      outfile = argv[3];
   } else {
      exitUsage(argv[0]); 
   }

   SoundHeader header(infile);

   // Elements:
   SoundFileIn  insound(infile);
   Envelope     freqEnv(freqenv, header.getSamples());
   Envelope     ampEnv(ampenv, header.getSamples());
   Osc          oscillator;
   SoundFileOut outsound(outfile, header);
   Multiply     ringmod;
   Multiply     ringmodRight;

   // Connections:
   outsound.connect(ringmod);
   if (header.getChannels() == 2) {
      outsound.connect(ringmodRight);
   }
   ringmod.connect(insound);
   ringmod.connect(oscillator);
   oscillator.connect(freqEnv, 0);
   oscillator.connect(ampEnv, 1);
   ringmodRight.connect(insound, 0, 1);
   ringmodRight.connect(oscillator);

   Action action;
   action.tick(outsound, header.getSamples());


   return 0;
}


void exitUsage(const char* command) {
   cout << endl;
   cout << "A ring modulator.  Creates a sinusoid which is multiplied" << endl;
   cout << "with the input sound." << endl;
   cout << endl;
   cout << "Usage: " << command << " freqEnv [ampEnv] insound outsound" 
        << endl;
   cout << endl;
   cout << "   If ampEnv is not specified, then the default is \"(0 1; 1 1)\"."
        << endl << endl;
   cout << "Example envelope strings: pairs of time, freq or amp" << endl;
   cout << "   constant env of 440: \"(0 440; 100 440)\"  " << endl;
   cout << "   triangle env:      \"(0 0; 1 800; 2 0)\" " << endl;
   cout << "   ramp at begin/end: \"(0 0; 1000 100; s; 2000 0)\" " << endl;
   cout << "      with stick points time is given in samples. " << endl;
   cout << endl;

   exit(1);
}



// md5sum: 4c9645161ea34998972201e752f20af2 ring.cpp [20050403]