void midi_process(snd_seq_event_t *ev)
{
//If this event is a PGMCHANGE type, it's a request to map a channel to an instrument
if( ev->type == SND_SEQ_EVENT_PGMCHANGE ) {
//Clear pins state, this is probably the beginning of a new song
clearPinsState();
setPlayChannel(ev->data.control.channel, 1);
}
else if ( ((ev->type == SND_SEQ_EVENT_NOTEON)||(ev->type == SND_SEQ_EVENT_NOTEOFF)) ) { //Note on/off event
int isOn = 1;
//Note velocity == 0 means the same thing as a NOTEOFF type event
if( ev->data.note.velocity == 0 || ev->type == SND_SEQ_EVENT_NOTEOFF) {
isOn = 0;
}
//There are 12 different kinds of notes. (I will only use the first 8 for my rig but I need to the modulus. will be 0-11.)
int pinIdx = ev->data.note.note % 12;
//If pin is set to be turned on
if( isOn ) {
//If pin is currently available to play a note, or if currently playing channel can be overriden due to higher priority channel
if( pinNotes[pinIdx] == -1 || pinChannels[pinIdx] > ev->data.note.channel ) {
//Write to the pin, save the note to pinNotes
digitalWrite(pinIdx, 1);
pinNotes[pinIdx] = ev->data.note.note;
pinChannels[pinIdx] = ev->data.note.channel;
}
}
else { //Pin is to be turned off
//If this is the note that turned the pin on..
if( pinNotes[pinIdx] == ev->data.note.note && pinChannels[pinIdx] == ev->data.note.channel ) {
//Write to the pin, indicate that pin is available
digitalWrite(pinIdx, 0);
pinNotes[pinIdx] = -1;
pinChannels[pinIdx] = INT_MAX;
}
}
}
else {
printf("Unhandled event %2d\n", ev->type);
}
snd_seq_free_event(ev);
} // end of midi_process
void midi_process(snd_seq_event_t *ev)
{
//If this event is a PGMCHANGE type, it's a request to map a channel to an instrument
if( ev->type == SND_SEQ_EVENT_PGMCHANGE ) {
printf("PGMCHANGE: channel %2d, %5d, %5d\n", ev->data.control.channel, ev->data.control.param, ev->data.control.value);
//Clear pins state, this is probably the beginning of a new song
clearPinsState();
//Filter out this channel if it's a base, percussion, or synth instrument
if(
(ev->data.control.value >= 8 && ev->data.control.value <= 15) || //Percussion
(ev->data.control.value >= 32 && ev->data.control.value <= 39) || //Base
(ev->data.control.value >= 88 && ev->data.control.value <= 103) //Synth
) {
setPlayChannel(ev->data.control.channel, 0);
}
else {
setPlayChannel(ev->data.control.channel, 1);
}
}
//Note on/off event
else if ( ((ev->type == SND_SEQ_EVENT_NOTEON)||(ev->type == SND_SEQ_EVENT_NOTEOFF)) ) {
//If it's on a channel I care about
if( isPlayChannel(ev->data.note.channel) ) {
int isOn = 1;
//Note velocity == 0 means the same thing as a NOTEOFF type event
if( ev->data.note.velocity == 0 || ev->type == SND_SEQ_EVENT_NOTEOFF) {
isOn = 0;
}
//There are 12 different kinds of notes.
int noteMod = ev->data.note.note % 12;
//Cast to double
double noteModDouble = noteMod;
//The pin to use is determined by:
// ( pitch / ( Total number of notes / Total Number of Pins) )
double noteBin = noteModDouble / (12.0 / MY_NUM_PINS);
//Cast back to int
int pinIdx = (int)noteBin;
//If pin is set to be turned on
if( isOn ) {
//If pin is currently available to play a note, or if currently playing channel can be overriden due to higher priority channel
if( pinNotes[pinIdx] == -1 || pinChannels[pinIdx] > ev->data.note.channel ) {
if( (pinChannels[pinIdx] > ev->data.note.channel ) && pinNotes[pinIdx] != -1) {
printf("OVERRIDING CHANNEL %i for %i\n", pinChannels[pinIdx], ev->data.note.channel);
}
//Write to the pin, save the note to pinNotes
//printf("Pin %i - %s %i %i \n", pinIdx, isOn ? "on" : "off", ev->data.note.note, ev->data.note.channel);
digitalWrite(pinIdx, 1);
pinNotes[pinIdx] = ev->data.note.note;
pinChannels[pinIdx] = ev->data.note.channel;
}
}
//Pin is to be turned off
else {
//If this is the note that turned the pin on..
if( pinNotes[pinIdx] == ev->data.note.note && pinChannels[pinIdx] == ev->data.note.channel ) {
//Write to the pin, indicate that pin is available
//printf("Pin %i - %s %i %i \n", pinIdx, isOn ? "on" : "off", ev->data.note.note, ev->data.note.channel);
digitalWrite(pinIdx, 0);
pinNotes[pinIdx] = -1;
pinChannels[pinIdx] = INT_MAX;
}
}
}
}
else {
printf("Unhandled event %2d\n", ev->type);
}
snd_seq_free_event(ev);
}
