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vibrato and polyphony paratmeters

This commit is contained in:
Jack Humbert 2016-04-19 17:00:45 -04:00
parent d3fc077fa3
commit fd49dfe5cb
3 changed files with 249 additions and 159 deletions

View file

@ -10,10 +10,13 @@
#include "eeconfig.h"
#include "vibrato_lut.h"
#define PI 3.14159265
#define CPU_PRESCALER 8
// Largely untested PWM audio mode (doesn't sound as good)
// #define PWM_AUDIO
#ifdef PWM_AUDIO
@ -67,10 +70,11 @@ bool note_resting = false;
uint8_t current_note = 0;
uint8_t rest_counter = 0;
uint8_t vibrato_counter = 0;
float vibrato_strength = 0;
float vibrato_counter = 0;
float vibrato_strength = .5;
float vibrato_rate = 0.125;
float polyphony_rate = 0;
float polyphony_rate = .5;
audio_config_t audio_config;
@ -90,6 +94,81 @@ void audio_off(void) {
eeconfig_write_audio(audio_config.raw);
}
// Vibrato rate functions
void set_vibrato_rate(float rate) {
vibrato_rate = rate;
}
void increase_vibrato_rate(float change) {
vibrato_rate *= change;
}
void decrease_vibrato_rate(float change) {
vibrato_rate /= change;
}
#ifdef VIBRATO_STRENGTH_ENABLE
void set_vibrato_strength(float strength) {
vibrato_strength = strength;
}
void increase_vibrato_strength(float change) {
vibrato_strength *= change;
}
void decrease_vibrato_strength(float change) {
vibrato_strength /= change;
}
#endif
// Polyphony functions
void set_polyphony_rate(float rate) {
polyphony_rate = rate;
}
void enable_polyphony() {
polyphony_rate = 5;
}
void disable_polyphony() {
polyphony_rate = 0;
}
void increase_polyphony_rate(float change) {
polyphony_rate *= change;
}
void decrease_polyphony_rate(float change) {
polyphony_rate /= change;
}
// Timbre function
void set_timbre(float timbre) {
note_timbre = timbre;
}
// Tempo functions
void set_tempo(float tempo) {
note_tempo = tempo;
}
void decrease_tempo(uint8_t tempo_change) {
note_tempo += (float) tempo_change;
}
void increase_tempo(uint8_t tempo_change) {
if (note_tempo - (float) tempo_change < 10) {
note_tempo = 10;
} else {
note_tempo -= (float) tempo_change;
}
}
void stop_all_notes() {
voices = 0;
@ -112,6 +191,7 @@ void stop_all_notes() {
void stop_note(double freq) {
if (note) {
cli();
#ifdef PWM_AUDIO
freq = freq / SAMPLE_RATE;
#endif
@ -125,6 +205,7 @@ void stop_note(double freq) {
volumes[j] = volumes[j+1];
volumes[j+1] = 0;
}
break;
}
}
voices--;
@ -144,6 +225,7 @@ void stop_note(double freq) {
volume = 0;
note = false;
}
sei();
}
}
@ -190,6 +272,16 @@ float mod(float a, int b)
return r < 0 ? r + b : r;
}
float vibrato(float average_freq) {
#ifdef VIBRATO_STRENGTH_ENABLE
float vibrated_freq = average_freq * pow(VIBRATO_LUT[(int)vibrato_counter], vibrato_strength);
#else
float vibrated_freq = average_freq * VIBRATO_LUT[(int)vibrato_counter];
#endif
vibrato_counter = mod((vibrato_counter + vibrato_rate * (1.0 + 440.0/average_freq)), VIBRATO_LUT_LENGTH);
return vibrated_freq;
}
ISR(TIMER3_COMPA_vect) {
if (note) {
#ifdef PWM_AUDIO
@ -241,34 +333,30 @@ ISR(TIMER3_COMPA_vect) {
}
#else
if (voices > 0) {
if (false && polyphony_rate > 0) {
if (polyphony_rate > 0) {
if (voices > 1) {
voice_place %= voices;
if (place++ > (frequencies[voice_place] / polyphony_rate / CPU_PRESCALER / voices)) {
if (place++ > (frequencies[voice_place] / polyphony_rate / CPU_PRESCALER)) {
voice_place = (voice_place + 1) % voices;
place = 0.0;
}
}
if (vibrato_strength > 0) {
freq = frequencies[voice_place] * pow(VIBRATO_LUT[(int)vibrato_counter], vibrato_strength);
vibrato_counter = mod((vibrato_counter + 1), VIBRATO_LUT_LENGTH);
freq = vibrato(frequencies[voice_place]);
} else {
freq = frequencies[voice_place];
}
} else {
if (frequency != 0) {
if (frequency < frequencies[voices - 1]) {
frequency = frequency * pow(2, 440/frequencies[voices - 1]/12/4);
} else if (frequency > frequencies[voices - 1]) {
frequency = frequency * pow(2, -440/frequencies[voices - 1]/12/4);
}
if (frequency != 0 && frequency < frequencies[voices - 1] && frequency < frequencies[voices - 1] * pow(2, -440/frequencies[voices - 1]/12/2)) {
frequency = frequency * pow(2, 440/frequency/12/2);
} else if (frequency != 0 && frequency > frequencies[voices - 1] && frequency > frequencies[voices - 1] * pow(2, 440/frequencies[voices - 1]/12/2)) {
frequency = frequency * pow(2, -440/frequency/12/2);
} else {
frequency = frequencies[voices - 1];
}
if (false && vibrato_strength > 0) {
freq = frequency * pow(VIBRATO_LUT[(int)vibrato_counter], vibrato_strength);
vibrato_counter = mod((vibrato_counter + 1 + 440/frequencies[voices - 1]), VIBRATO_LUT_LENGTH);
if (vibrato_strength > 0) {
freq = vibrato(frequency);
} else {
freq = frequency;
}
@ -302,9 +390,8 @@ ISR(TIMER3_COMPA_vect) {
if (note_frequency > 0) {
float freq;
if (false && vibrato_strength > 0) {
freq = note_frequency * pow(VIBRATO_LUT[(int)vibrato_counter], vibrato_strength);
vibrato_counter = mod((vibrato_counter + 1), VIBRATO_LUT_LENGTH);
if (vibrato_strength > 0) {
freq = vibrato(note_frequency);
} else {
freq = note_frequency;
}
@ -369,7 +456,7 @@ ISR(TIMER3_COMPA_vect) {
void play_notes(float (*np)[][2], uint8_t n_count, bool n_repeat, float n_rest) {
if (audio_config.enable) {
cli();
// Cancel note if a note is playing
if (note)
stop_all_notes();
@ -398,7 +485,7 @@ if (audio_config.enable) {
TIMSK3 |= _BV(OCIE3A);
TCCR3A |= _BV(COM3A1);
#endif
sei();
}
}
@ -425,7 +512,7 @@ if (audio_config.enable) {
void play_note(double freq, int vol) {
if (audio_config.enable && voices < 8) {
cli();
// Cancel notes if notes are playing
if (notes)
stop_all_notes();
@ -445,38 +532,11 @@ if (audio_config.enable && voices < 8) {
TIMSK3 |= _BV(OCIE3A);
TCCR3A |= _BV(COM3A1);
#endif
sei();
}
}
void set_timbre(float timbre)
{
note_timbre = timbre;
}
void set_tempo(float tempo)
{
note_tempo = tempo;
}
void decrease_tempo(uint8_t tempo_change)
{
note_tempo += (float) tempo_change;
}
void increase_tempo(uint8_t tempo_change)
{
if (note_tempo - (float) tempo_change < 10)
{
note_tempo = 10;
}
else
{
note_tempo -= (float) tempo_change;
}
}
//------------------------------------------------------------------------------
// Override these functions in your keymap file to play different tunes on
// startup and bootloader jump