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#include <iostream>
#include <fstream>
#include <sstream>
#include <vector>
#include <map>
#include <windows.h>
using namespace std;
const double factorOctave = 2.0;
const double factorSemitone = 1.0594630943593;
map<string,double> noteMap;
// Default tune (guess!)
// First line is beats per minute; next triplets are:
// base note (R is a rest); octave relative to central octave (defined below); number of beats;
string MUSIC( "150"
"R 0 1 D 0 1 C 0 1 D 0 1 Eb 0 3 D 0 1 C 0 1 D 0 1 Bb 0 1.5 C 0 0.5 C 0 1 D 0 3"
"R 0 1 D 0 1 C 0 1 D 0 1 Eb 0 3 D 0 1 C 0 1 D 0 1 Bb 0 1.5 C 0 0.5 D 0 4 "
"R 0 1 F 0 1 F 0 1 F 0 1 G 0 3 D 0 1 D 0 1 F 0 1 F 0 1.5 C 0 0.5 C 0 1 Eb 0 3"
"R 0 1 Eb 0 1 D 0 1 C 0 1 D 0 3 Bb 0 1 Bb 0 1 C 0 1 C 0 1.5 D 0 0.5 D 0 4 "
"R 0 1 F 0 1 F 0 1 F 0 1 G 0 3 D 0 1 D 0 1 F 0 1 F 0 1.5 C 0 0.5 C 0 1 Eb 0 3"
"R 0 1 Eb 0 1 D 0 1 C 0 1 D 0 3 Bb 0 1 Bb 0 1 C 0 1 C 0 1.5 Bb 0 0.5 Bb 0 4 " );
//======================================================================
class Note
{
public:
string baseNote;
int octave;
double beats;
Note( string bn = "A", int o = 0, double bt = 1.0 ) : baseNote( bn ), octave( o ), beats( bt ) {}
};
//----------
istream &operator >> ( istream &strm, Note &n )
{
strm >> n.baseNote >> n.octave >> n.beats;
return strm;
}
//----------
ostream &operator << ( ostream &strm, Note &n )
{
strm << n.baseNote << " " << n.octave << " " << n.beats;
return strm;
}
//----------
bool validNote( const Note &n )
{
if ( noteMap.count( n.baseNote ) == 0 ) return false;
if ( n.beats <= 0 ) return false;
return true;
}
//======================================================================
void setMap() // Maps notes to frequency (in Hz) for octave starting at A above middle C
{
noteMap["A" ] = 440.00; // tuning-fork A
noteMap["A#"] = noteMap["Bb"] = 466.16;
noteMap["B" ] = noteMap["Cb"] = 493.88;
noteMap["B#"] = noteMap["C" ] = 523.25;
noteMap["C#"] = noteMap["Db"] = 554.37;
noteMap["D" ] = 587.33;
noteMap["D#"] = noteMap["Eb"] = 622.25;
noteMap["E" ] = 659.26;
noteMap["E#"] = noteMap["F" ] = 698.46;
noteMap["F#"] = noteMap["Gb"] = 739.99;
noteMap["G" ] = 783.99;
noteMap["G#"] = noteMap["Ab"] = 830.61;
noteMap["R" ] = 1.0 ; // rest (nominal frequency)
}
//======================================================================
void play( double freq, int ms ) // Frequency in Hertz, duration in milliseconds
{
int ifreq = freq + 0.5;
Beep( ifreq, ms ); // WINDOWS (but can be replaced by other libraries)
}
//======================================================================
void delay( int ms )
{
Sleep( ms ); // WINDOWS (but can be replaced by other libraries)
}
//======================================================================
double transpose( double freq, int oct, int sem )
{
while ( oct > 0 ) { freq *= factorOctave; oct--; }
while ( oct < 0 ) { freq /= factorOctave; oct++; }
while ( sem > 0 ) { freq *= factorSemitone; sem--; }
while ( sem < 0 ) { freq /= factorSemitone; sem++; }
return freq;
}
//======================================================================
void input( istream &in, vector<Note> ¬es, double &bpm )
{
Note n;
in >> bpm;
while ( in >> n ) if ( validNote( n ) ) notes.push_back( n );
}
//======================================================================
void playMusic( vector<Note> ¬es, double bpm )
{
double timeFactor = 1000.0 * 60.0 / bpm;
double frequency;
for ( Note n : notes )
{
int ms = timeFactor * n.beats + 0.5;
if ( n.baseNote == "R" ) // rest
{
delay( ms );
}
else // play note
{
frequency = transpose( noteMap[n.baseNote], n.octave, 0 );
play( frequency, ms );
}
}
}
//======================================================================
int main()
{
vector<Note> notes;
string filename = "music.in";
double bpm;
// Define basic note mapping for octave 0 (starts at A above middle C)
setMap();
// Read notes
// ifstream in( filename ); // Read from file
stringstream in( MUSIC ); // Or from string
input( in, notes, bpm ); // Read notes
// Play notes
playMusic( notes, bpm );
}
//======================================================================
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