quantizer.h

#ifndef TALENTENEDHACK_QUANTIZER_H
#define TALENTENEDHACK_QUANTIZER_H
#include <math.h> 
#include "lv2.h"
#include "lv2/lv2plug.in/ns/ext/atom/atom.h"
#include "lv2/lv2plug.in/ns/ext/atom/util.h"
#include "lv2/lv2plug.in/ns/ext/midi/midi.h"
#include "lv2/lv2plug.in/ns/ext/urid/urid.h"
#include <stdio.h>
#include <stdlib.h>

#define PI (float)3.14159265358979323846
//The log base 2 of 10 (or 1/log(2))
#define L2SC (float)3.32192809488736218171 

typedef struct {
	float* A;
	float* Bb;
	float* B;
	float* C;
	float* Db;
	float* D;
	float* Eb;
	float* E;
	float* F;
	float* Gb;
	float* G;
	float* Ab;
} Notes;

typedef struct {
	int note;
	float pitchbend; //scaled from -1 to 1, representing -6 to 6 semitone shift.
} MidiPitch;


typedef struct {
	Notes inotes; //The notes to be detected, should be the set of notes that the singer is attempting to sing
	Notes onotes; //The set of notes to be output, i.e. the scale you want the output to be in.
	
	float* p_amount;
	float* p_accept_midi;
	
	int iNotes[12];
	int oNotes[127];

	float* p_aref; // A tuning reference (Hz)
	
	MidiPitch InPitch;
	MidiPitch OutPitch;
	
	struct {
		LV2_URID midi_MidiEvent;
		LV2_URID atom_Sequence;
	} uris;
	
	LV2_Atom_Sequence* p_midi_in;
	LV2_Atom_Sequence* p_midi_out;

	bool midi_in_last_event_valid;
	uint8_t midi_in_last_event[3];
	uint32_t midi_out_capacity;

} Quantizer;


void UpdateQuantizer(Quantizer * q);

void QuantizerInit(Quantizer* q, const LV2_Feature * const * features);

void PullToInTune(Quantizer* q, MidiPitch* pitch);

void SendMidiOutput(Quantizer* q, MidiPitch pitch, int samplenum);

MidiPitch FetchLatestMidiNote(Quantizer* q, int samplenum);

MidiPitch pperiod_to_midi(Quantizer* q, float pperiod) ;

float midi_to_semitones(MidiPitch pitch);
float semitones_to_pperiod(Quantizer* q, float semitones);

int SnapToKey(int notes[12], int note, int snapup);

MidiPitch MixMidiIn(Quantizer* q, MidiPitch detected, MidiPitch in);

void UnVoiceMidi(Quantizer* q, int samplenum);

inline int positive_mod(int A, int B) {
	int C=A%B;
	if(C<0) {
		C+=B;
	}
	return C;
};
#endif