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synth_note.cpp
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synth_note.cpp
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#include "synth_note.h"
#include "sin_wave.h"
#include "frequencies.h"
#include "envelope.h"
#include <stdio.h>
#include <stdlib.h>
void create_note(synth_note * sn, int note, int octave, float start_time, float len)
{
sn->note = note;
sn->octave = octave;
sn->start_time = start_time;
sn->end_time = start_time + len;
printf("Start Time: %f\n", sn->start_time);
printf("End Time: %f\n", sn->end_time);
//create sin waves
sin_wave base;
init(&base, 0.15, 0.0, get_frequency(note, octave));
create_envelope(&(sn->env), 0.1, len);
sn->num_waves = 8;
sn->waves = (sin_wave *) malloc(sizeof(sin_wave) * sn->num_waves);
sn->waves[0] = base;
harmonic(&(sn->waves[1]), &(sn->waves[0]), 2);
harmonic(&(sn->waves[2]), &(sn->waves[0]), 3);
harmonic(&(sn->waves[3]), &(sn->waves[0]), 4);
harmonic(&(sn->waves[4]), &(sn->waves[0]), 5);
harmonic(&(sn->waves[5]), &(sn->waves[0]), 6);
harmonic(&(sn->waves[6]), &(sn->waves[0]), 7);
harmonic(&(sn->waves[7]), &(sn->waves[0]), 8);
}
void destroy_note(synth_note * sn)
{
free(sn->waves);
}
float sample_note(synth_note * sn, float t)
{
float sample = 0.0;
float relative_time = t - sn->start_time;
// printf("New Sample\n");
for(int i = 0; i < sn->num_waves; i++)
{
sample += sample_wave( &(sn->waves[i]), relative_time);
}
// printf("Sample before envelope: %f\n", sample);
sample = sample * sample_envelope(&(sn->env), relative_time);
// printf("Sample after envelope: %f\n", sample);
return sample;
}