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/*
* File: main.c
* Author: _prossn
* Date: 08.01.2018
* Version 1.0
*
* Description:
* C API to work with MIDI formatted data
*/
#ifndef MIDI_H
#define MIDI_H
#include <stdint.h>
#include <stddef.h>
#ifndef MIDI_DYNAMIC_MEMORY_ALLOC
#define MIDI_DATA_MAX_SIZE 4
#endif
typedef enum {
NOTE_OFF = 0x8,
NOTE_ON = 0x9,
POLYPHONIC_KEYPRESS = 0xA,
CONTROLLER = 0xB,
PROGRAM_CHANGE = 0xC,
CHANNEL_PRESSURE = 0xD,
PITCH_BLEND = 0xF
} midi_status_t;
typedef struct {
unsigned status :4;
unsigned channel :4;
#ifdef MIDI_DYNAMIC_MEMORY_ALLOC
uint8_t data[];
#else
size_t data_size;
uint8_t data[MIDI_DATA_MAX_SIZE];
#endif
} midi_message_t;
// starts at C2
const unsigned midi_notes_steps_table[] = {
36, 38, 40, 41, 43, 45, 47, // C2 - B2
// 48, 50, 52, 53, 55, 57, 59, // C3 - B3
// 60, 62, 64, 65, 67, 69, 71, // C4 - B4
// hardware bugfix
// TODO se a compilation macro
48, 50, 52, 53, 55, 57, 62, // C3 - B3
60, 59, 64, 65, 67, 69, 71, // C4 - B4
};
/* MIDI API */
#ifdef MIDI_DYNAMIC_MEMORY_ALLOC
// allocation / dellocation
extern midi_message_t *midi_alloc_message(size_t data_size);
extern void midi_free_message(const midi_message_t *pkt);
extern size_t midi_message_size(const midi_message_t *pkt);
#endif
// helper functions
extern int midi_set_status(midi_message_t *pkt, midi_status_t status);
extern int midi_set_channel(midi_message_t *pkt, unsigned channel);
// message building
extern int midi_note_on(midi_message_t *pkt, unsigned channel, unsigned note, uint8_t velocity);
extern int midi_note_off(midi_message_t *pkt, unsigned channel, unsigned note, uint8_t velocity);
// optimization
// extern int midi_thin_data(void *buffer, midi_message_t pkt[]);
#endif /* MIDI_H */
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