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#include "midi.h"
#include <stdint.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#ifdef MIDI_DYNAMIC_MEMORY_ALLOC
midi_message_t *midi_alloc_message(size_t data_size)
{
return (midi_message_t *) malloc(sizeof(midi_message_t) + data_size);
}
void midi_free_message(midi_message_t *pkt)
{
if (pkt == NULL) {
return;
}
free(pkt);
pkt = NULL;
}
size_t midi_message_size(const midi_message_t *pkt)
{
if (pkt == NULL) {
return 0;
}
switch (pkt->status) {
case NOTE_ON: return sizeof(midi_message_t) + 2;
case NOTE_OFF: return sizeof(midi_message_t) + 1;
default: return sizeof(midi_message_t);
}
}
#endif
int midi_set_status(midi_message_t *pkt, midi_status_t status)
{
if (pkt == NULL) {
return -1;
}
pkt->status = status & 0x0F;
return 0;
}
int midi_set_channel(midi_message_t *pkt, unsigned channel)
{
if (pkt == NULL) {
return -1;
}
pkt->channel = channel & 0x0F;
return 0;
}
int midi_note_on(midi_message_t *pkt, unsigned channel, unsigned note, uint8_t velocity)
{
if (pkt == NULL) {
return -1;
}
#ifdef MIDI_DYNAMIC_MEMORY_ALLOC
if (pkt->data == NULL) {
return -2;
}
#endif
midi_set_status(pkt, NOTE_ON);
midi_set_channel(pkt, channel);
pkt->data[0] = note;
pkt->data[1] = velocity;
#ifndef MIDI_DYNAMIC_MEMORY_ALLOC
pkt->data_size = 2;
#endif
return 0;
}
int midi_note_off(midi_message_t *pkt, unsigned channel, unsigned note, uint8_t velocity)
{
if (pkt == NULL) {
return -1;
}
#ifdef MIDI_DYNAMIC_MEMORY_ALLOC
if (pkt->data == NULL) {
return -2;
}
#endif
midi_set_status(pkt, NOTE_OFF);
midi_set_channel(pkt, channel);
pkt->data[0] = note;
pkt->data[1] = velocity;
#ifndef MIDI_DYNAMIC_MEMORY_ALLOC
pkt->data_size = 2;
#endif
return 0;
}
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