teensy-audio/examples/Synthesis/Wavetable/MidiSynth/MidiSynth.ino

/* Play notes when your computer sends USB MIDI messages.

   To use this example, you must run software on your computer which
   sends MIDI.  Tools > USB Type must be set to MIDI when uploading.

   Requires Teensy 3.6 due to 520 kbytes of wavetable data
   Requires Audio Shield: https://www.pjrc.com/store/teensy3_audio.html
*/

// TODO: smaller samples, to fit in Teensy 3.2 memory
#include "Pizzicato_samples.h"
#include "FrenchHorns_samples.h"
#include "Viola_samples.h"
#include "BasicFlute1_samples.h"
#include "Ocarina_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},
};
Bounce buttons[] = { {0, 15}, {1, 15}, {2, 15}, };
const int TOTAL_BUTTONS = sizeof(buttons) / sizeof(Bounce);

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(0.8);

	for (int i = 0; i < TOTAL_VOICES; ++i) {
		wavetable[i].setInstrument(Pizzicato);
		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, 0.50);
	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);
	//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();
}

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(BasicFlute1);
		break;
	case 2:
		wavetable[wavetable_id].setInstrument(FrenchHorns);
		break;
	case 3:
		wavetable[wavetable_id].setInstrument(Ocarina);
		break;
	case 4:
		wavetable[wavetable_id].setInstrument(Ocarina);
		break;
	case 5:
		wavetable[wavetable_id].setInstrument(Pizzicato);
		break;
	default:
		wavetable[wavetable_id].setInstrument(Pizzicato);
		break;
	}
	wavetable[wavetable_id].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]);

}