Hello
In the process of converting single cycle waveforms to soundfonts for use with the wavetable object I have come across a problem:
When I create the custom soundfont it works on Windows in a variety of midi synths with no artifacting or noise, however, when I use the same soundfont in a a wavetable on the teensy there are very noticable artifacts. This doesn't happen with established soundfont packages I have ripped.
Main sketch below, followed by the 2 wavetables used
In the process of converting single cycle waveforms to soundfonts for use with the wavetable object I have come across a problem:
When I create the custom soundfont it works on Windows in a variety of midi synths with no artifacting or noise, however, when I use the same soundfont in a a wavetable on the teensy there are very noticable artifacts. This doesn't happen with established soundfont packages I have ripped.
Main sketch below, followed by the 2 wavetables used
Code:
#include "0001_samples.h"
#include "0002_samples.h"
#include <Bounce.h>
#include <Audio.h>
#include <Wire.h>
#include <SPI.h>
#include <SD.h>
#include <SerialFlash.h>
//#define DEBUG_ALLOC
const int TOTAL_VOICES = 64;
const int TOTAL_MIXERS = 21;
const int SECONDARY_MIXERS = 4;
AudioControlSGTL5000 sgtl5000_1;
AudioSynthWavetable wavetable[TOTAL_VOICES];
AudioMixer4 mixer[TOTAL_MIXERS];
AudioOutputI2S i2s1;
AudioConnection patchCord[] = {
{wavetable[0], 0, mixer[0], 0}, {wavetable[1], 0, mixer[0], 1}, {wavetable[2], 0, mixer[0], 2}, {wavetable[3], 0, mixer[0], 3}, {mixer[0], 0, mixer[TOTAL_MIXERS - 2], 0},
{wavetable[4], 0, mixer[1], 0}, {wavetable[5], 0, mixer[1], 1}, {wavetable[6], 0, mixer[1], 2}, {wavetable[7], 0, mixer[1], 3}, {mixer[1], 0, mixer[TOTAL_MIXERS - 2], 1},
{wavetable[8], 0, mixer[2], 0}, {wavetable[9], 0, mixer[2], 1}, {wavetable[10], 0, mixer[2], 2}, {wavetable[11], 0, mixer[2], 3}, {mixer[2], 0, mixer[TOTAL_MIXERS - 2], 2},
{wavetable[12], 0, mixer[3], 0}, {wavetable[13], 0, mixer[3], 1}, {wavetable[14], 0, mixer[3], 2}, {wavetable[15], 0, mixer[3], 3}, {mixer[3], 0, mixer[TOTAL_MIXERS - 2], 3},
{wavetable[16], 0, mixer[4], 0}, {wavetable[17], 0, mixer[4], 1}, {wavetable[18], 0, mixer[4], 2}, {wavetable[19], 0, mixer[4], 3}, {mixer[4], 0, mixer[TOTAL_MIXERS - 3], 0},
{wavetable[20], 0, mixer[5], 0}, {wavetable[21], 0, mixer[5], 1}, {wavetable[22], 0, mixer[5], 2}, {wavetable[23], 0, mixer[5], 3}, {mixer[5], 0, mixer[TOTAL_MIXERS - 3], 1},
{wavetable[24], 0, mixer[6], 0}, {wavetable[25], 0, mixer[6], 1}, {wavetable[26], 0, mixer[6], 2}, {wavetable[27], 0, mixer[6], 3}, {mixer[6], 0, mixer[TOTAL_MIXERS - 3], 2},
{wavetable[28], 0, mixer[7], 0}, {wavetable[29], 0, mixer[7], 1}, {wavetable[30], 0, mixer[7], 2}, {wavetable[31], 0, mixer[7], 3}, {mixer[7], 0, mixer[TOTAL_MIXERS - 3], 3},
{wavetable[32], 0, mixer[8], 0}, {wavetable[33], 0, mixer[8], 1}, {wavetable[34], 0, mixer[8], 2}, {wavetable[35], 0, mixer[8], 3}, {mixer[8], 0, mixer[TOTAL_MIXERS - 4], 0},
{wavetable[36], 0, mixer[9], 0}, {wavetable[37], 0, mixer[9], 1}, {wavetable[38], 0, mixer[9], 2}, {wavetable[39], 0, mixer[9], 3}, {mixer[9], 0, mixer[TOTAL_MIXERS - 4], 1},
{wavetable[40], 0, mixer[10], 0}, {wavetable[41], 0, mixer[10], 1}, {wavetable[42], 0, mixer[10], 2}, {wavetable[43], 0, mixer[10], 3}, {mixer[10], 0, mixer[TOTAL_MIXERS - 4], 2},
{wavetable[44], 0, mixer[11], 0}, {wavetable[45], 0, mixer[11], 1}, {wavetable[46], 0, mixer[11], 2}, {wavetable[47], 0, mixer[11], 3}, {mixer[11], 0, mixer[TOTAL_MIXERS - 4], 3},
{wavetable[48], 0, mixer[12], 0}, {wavetable[49], 0, mixer[12], 1}, {wavetable[50], 0, mixer[12], 2}, {wavetable[51], 0, mixer[12], 3}, {mixer[12], 0, mixer[TOTAL_MIXERS - 5], 0},
{wavetable[52], 0, mixer[13], 0}, {wavetable[53], 0, mixer[13], 1}, {wavetable[54], 0, mixer[13], 2}, {wavetable[55], 0, mixer[13], 3}, {mixer[13], 0, mixer[TOTAL_MIXERS - 5], 1},
{wavetable[56], 0, mixer[14], 0}, {wavetable[57], 0, mixer[14], 1}, {wavetable[58], 0, mixer[14], 2}, {wavetable[59], 0, mixer[14], 3}, {mixer[14], 0, mixer[TOTAL_MIXERS - 5], 2},
{wavetable[60], 0, mixer[15], 0}, {wavetable[61], 0, mixer[15], 1}, {wavetable[62], 0, mixer[15], 2}, {wavetable[63], 0, mixer[15], 3}, {mixer[15], 0, mixer[TOTAL_MIXERS - 5], 3},
{mixer[TOTAL_MIXERS - 2], 0, mixer[TOTAL_MIXERS - 1], 0},
{mixer[TOTAL_MIXERS - 3], 0, mixer[TOTAL_MIXERS - 1], 1},
{mixer[TOTAL_MIXERS - 4], 0, mixer[TOTAL_MIXERS - 1], 2},
{mixer[TOTAL_MIXERS - 5], 0, mixer[TOTAL_MIXERS - 1], 3},
{mixer[TOTAL_MIXERS - 1], 0, i2s1, 0},
{mixer[TOTAL_MIXERS - 1], 0, i2s1, 1},
};
AudioSynthWavetable::instrument_data customWavetables[] =
{ 0001, 0002};
Bounce buttons[] = { {0, 15}, {1, 15}, {2, 15}, };
const int TOTAL_BUTTONS = sizeof(buttons) / sizeof(Bounce);
static int CURRENT_INSTRUMENT = 00;
void guitarHeroMode();
void printVoices();
void setVolume() {
sgtl5000_1.volume(0.8 * (analogRead(PIN_A2) - 1) / 1022.0);
}
struct voice_t {
int wavetable_id;
byte channel;
byte note;
};
voice_t voices[TOTAL_VOICES];
IntervalTimer midiMapTimer;
IntervalTimer guitarHeroTimer;
IntervalTimer volumeTimer;
void setup() {
Serial.begin(115200);
pinMode(0, INPUT_PULLUP);
pinMode(1, INPUT_PULLUP);
pinMode(2, INPUT_PULLUP);
AudioMemory(120);
sgtl5000_1.enable();
sgtl5000_1.volume(.77);
sgtl5000_1.audioPostProcessorEnable();
sgtl5000_1.autoVolumeControl(0, 0, 0, -18.0, .001, .002);
for (int i = 0; i < TOTAL_VOICES; ++i) {
wavetable[i].setInstrument(customWavetables[CURRENT_INSTRUMENT]);
wavetable[i].amplitude(1);
voices[i].wavetable_id = i;
voices[i].channel = voices[i].note = 0xFF;
}
for (int i = 0; i < TOTAL_MIXERS - 1; ++i)
for (int j = 0; j < 4; ++j)
mixer[i].gain(j, 0.5);
for (int i = 0; i < 4; ++i)
mixer[TOTAL_MIXERS - 1].gain(i, i < SECONDARY_MIXERS ? 1.0 / SECONDARY_MIXERS : 0.0);
usbMIDI.setHandleNoteOn(OnNoteOn);
usbMIDI.setHandleNoteOff(OnNoteOff);
usbMIDI.setHandleControlChange(OnControlChange);
//volumeTimer.begin(setVolume, 100000);
//guitarHeroTimer.begin(guitarHeroMode, 1000000 / 120);
//midiMapTimer.begin(printVoices, 5000);
delay(2000);
}
void loop() {
usbMIDI.read();
//for (int i = 0; i < TOTAL_BUTTONS; ++i) buttons[i].update();
//if (buttons[0].fallingEdge()) AudioSynthWavetable::print_performance();
//if (buttons[1].risingEdge()) {
// midiMapTimer.end();
// Serial.print('\n');
//}
//if (buttons[1].fallingEdge()) midiMapTimer.begin(printVoices, 5000);
//if (buttons[2].risingEdge()) guitarHeroTimer.end();
//if (buttons[2].fallingEdge())
// guitarHeroTimer.begin(guitarHeroMode, 1000000/60);
}
int allocateVoice(byte channel, byte note);
int findVoice(byte channel, byte note);
void freeVoices();
int used_voices = 0;
int stopped_voices = 0;
int evict_voice = 0;
int notes_played = 0;
void OnPress(int key)
{
Serial.print("key '");
Serial.print((char)key);
Serial.print("' ");
Serial.println(key);
//Serial.print("key ");
//Serial.print((char)keyboard1.getKey());
//Serial.print(" ");
//Serial.print((char)keyboard2.getKey());
//Serial.println();
}
void OnControlChange(byte channel, byte control, byte value)
{
Serial.print("Control Change, ch=");
Serial.print(channel);
Serial.print(", control=");
Serial.print(control);
Serial.print(", value=");
Serial.print(value);
Serial.println();
switch (control) {
case 70:
CURRENT_INSTRUMENT = value;
for (int i = 0; i < TOTAL_VOICES; ++i) {
wavetable[i].setInstrument(customWavetables[CURRENT_INSTRUMENT]);
wavetable[i].amplitude(1);
voices[i].wavetable_id = i;
voices[i].channel = voices[i].note = 0xFF;
}
break;
}
}
void OnNoteOn(byte channel, byte note, byte velocity) {
notes_played++;
#ifdef DEBUG_ALLOC
//Serial.printf("**** NoteOn: channel==%hhu,note==%hhu ****\n", channel, note);
printVoices();
#endif //DEBUG_ALLOC
freeVoices();
int wavetable_id = allocateVoice(channel, note);
switch (channel) {
case 1:
wavetable[wavetable_id].setInstrument(customWavetables[CURRENT_INSTRUMENT]);
break;
/*
case 2:
wavetable[wavetable_id].setInstrument(Vibraphone0);
break;
case 3:
wavetable[wavetable_id].setInstrument(MusicBox);
break;
case 4:
wavetable[wavetable_id].setInstrument(AcouPiano3);
break;
case 5:
wavetable[wavetable_id].setInstrument(SynthStrings1);
break;
case 6:
wavetable[wavetable_id].setInstrument(Ocarina);
break;
case 7:
wavetable[wavetable_id].setInstrument(Seashore);
break;
case 8:
wavetable[wavetable_id].setInstrument(Recorder);
break;
case 9:
wavetable[wavetable_id].setInstrument(SynthStrings1);
break;
case 10:
wavetable[wavetable_id].setInstrument(ElectricPiano0);
break;
case 11:
wavetable[wavetable_id].setInstrument(ElectricPiano0);
break;
*/
default:
wavetable[wavetable_id].setInstrument(customWavetables[CURRENT_INSTRUMENT]);
break;
}
wavetable[wavetable_id].playNote(note, velocity);
//wavetable[wavetable_id+1].playNote(note, velocity);
#ifdef DEBUG_ALLOC
printVoices();
#endif //DEBUG_ALLOC
}
void OnNoteOff(byte channel, byte note, byte velocity) {
#ifdef DEBUG_ALLOC
//Serial.printf("\n**** NoteOff: channel==%hhu,note==%hhu ****", channel, note);
printVoices();
#endif //DEBUG_ALLOC
int wavetable_id = findVoice(channel, note);
if (wavetable_id != TOTAL_VOICES)
wavetable[wavetable_id].stop();
#ifdef DEBUG_ALLOC
printVoices();
#endif //DEBUG_ALLOC
}
int allocateVoice(byte channel, byte note) {
int i;
int nonfree_voices = stopped_voices + used_voices;
if (nonfree_voices < TOTAL_VOICES) {
for (i = nonfree_voices; i < TOTAL_VOICES && voices[i].channel != channel; ++i);
if (i < TOTAL_VOICES) {
voice_t temp = voices[i];
voices[i] = voices[nonfree_voices];
voices[nonfree_voices] = temp;
}
i = nonfree_voices;
used_voices++;
}
else {
if (stopped_voices) {
i = evict_voice % stopped_voices;
voice_t temp = voices[i];
stopped_voices--;
voices[i] = voices[stopped_voices];
voices[stopped_voices] = temp;
used_voices++;
i = stopped_voices;
}
else
i = evict_voice;
}
voices[i].channel = channel;
voices[i].note = note;
evict_voice++;
evict_voice %= TOTAL_VOICES;
return voices[i].wavetable_id;
}
int findVoice(byte channel, byte note) {
int i;
//find match
int nonfree_voices = stopped_voices + used_voices;
for (i = stopped_voices; i < nonfree_voices && !(voices[i].channel == channel && voices[i].note == note); ++i);
//return TOTAL_VOICES if no match
if (i == (nonfree_voices)) return TOTAL_VOICES;
voice_t temp = voices[i];
voices[i] = voices[stopped_voices];
voices[stopped_voices] = temp;
--used_voices;
return voices[stopped_voices++].wavetable_id;
}
void freeVoices() {
for (int i = 0; i < stopped_voices; i++)
if (wavetable[voices[i].wavetable_id].isPlaying() == false) {
voice_t temp = voices[i];
--stopped_voices;
voices[i] = voices[stopped_voices];
int nonfree_voices = stopped_voices + used_voices;
voices[stopped_voices] = voices[nonfree_voices];
voices[nonfree_voices] = temp;
}
}
void guitarHeroMode() { // now unicorn friendly
const int RESET = 4;
const int MIDI_NOTES = 128;
static char line[MIDI_NOTES + 1] = { 0 };
static int accumulated = 0;
if (!accumulated) {
for (int i = 0; i < MIDI_NOTES; ++i) line[i] = '-';
++accumulated;
}
for (int i = stopped_voices; i < used_voices + stopped_voices; ++i) line[voices[i].note] = '*';
if (accumulated == RESET) {
Serial.println(line);
accumulated = 0;
}
else {
++accumulated;
}
}
const char* note_map[] = {
"C", "C#", "D", "D#", "E", "F", "F#", "G", "G#", "A", "A#", "B"
};
void printVoices() {
static int last_notes_played = notes_played;
if (last_notes_played == notes_played)
return;
last_notes_played = notes_played;
int usage = AudioProcessorUsage();
Serial.printf("\nCPU:%03i voices:%02i CPU/Voice:%02i evict:%02i", usage, used_voices, usage / used_voices, evict_voice);
for (int i = 0; i < used_voices; ++i)
Serial.printf(" %02hhu %-2s", voices[i].channel, note_map[voices[i].note % 12]);
}
Last edited:
