Nanomidi is a very minimal MIDI parser for C. It supports all 7 MIDI channel messages and ignores everything else. (I may support the rest in the future, but that's all I need for now.)
The intended use is to read real-time MIDI data from a stream (for example stdin).
It does not read MIDI files.
License: MIT
#include <stdio.h>
#include "nanomidi.h"
void handle_msg(struct midi_msg *msg)
{
switch(msg->type) {
case MIDI_NOTE_ON:
printf("Note on #%d note=%d velocity=%d\n", msg->channel, msg->data[0], msg->data[1]);
break;
case MIDI_NOTE_OFF:
printf("Note off #%d note=%d velocity=%d\n", msg->channel, msg->data[0], msg->data[1]);
break;
case MIDI_PROGRAM_CHANGE:
printf("Program change #%d program=%d\n", msg->channel, msg->data[0]);
break;
}
}
int main()
{
struct midi_buffer buf;
midi_buffer_init(&buf);
buf.callback = handle_msg; // Set a callback
buf.channel_mask = 0xff; // Listen to channels 0 to 7
// Read from stdin
while(midi_read(&buf, 0) == 0) {
}
return 0;
} Nanomidi has no support for sending MIDI, but it's easy to do. For example, to send a note on you could:
fputc(MIDI_NOTE_ON | 2, file); // channel = 2
fputc(69, file); // note
fputc(30, file); // velocity
fflush(file); // remember to flush!
- midi_read() doesn't detect EOF
- doesn't handle input from a pipe sometimes (accordion)
- implement sysex (but how should the API be?)
- implement system messages
Ole Martin Bjørndalen - ombdalen@gmail.com - http://nerdly.info/ole/