I'm writing a Chrome app, using the current stable build of Chrome (42.0.2311.152). I have this problem both on Linux and on my Chromebook.
I have a USB MIDI keyboard which is being recognized, but no MIDI events are detected. I have checked with other programs and am sure my device is sending MIDI events.
Here's my code:
function midihandler( event ) {
console.log("Received MIDI event");
var msg = "Recieved MIDI event ";
for (i=0 ; i < event.data.length ; i++) {
msg += "0x" + event.data[i].toString(16) + " ";
}
console.log(msg);
}
function setupMIDI() {
navigator.requestMIDIAccess().then(
function (m) {
console.log("MIDI initialized");
m.inputs.forEach(
function (entry) {
console.log("detected MIDI input device " + entry.name);
entry.onmidimessage = midihandler;
for (var key in entry) {
console.log("entry." + key + " = " + entry[key]);
}
}
);
},
function (msg) { console.log("error initializing MIDI: " + msg); }
);
}
window.onload = function() {
console.log("window.onload called");
setupMIDI();
};
The console output I get is:
window.onload called
MIDI initialized
detected MIDI input device MPKmini2 MIDI 1
entry.onmidimessage = function midihandler( event ) {
console.log("Received MIDI event");
var msg = "Recieved MIDI event ";
for (i=0 ; i < event.data.length ; i++) {
msg += "0x" + event.data[i].toString(16) + " ";
}
console.log(msg);
}
entry.ondisconnect = null
entry.version = USB-Audio / ALSA library version 1.0.25
entry.type = input
entry.name = MPKmini2 MIDI 1
entry.manufacturer = AKAI
entry.id = 24:0 MPKmini2 MIDI 1
entry.addEventListener = function addEventListener() { [native code] }
entry.removeEventListener = function removeEventListener() { [native code] }
entry.dispatchEvent = function dispatchEvent() { [native code] }
detected MIDI input device Midi Through Port-0
entry.onmidimessage = function midihandler( event ) {
console.log("Received MIDI event");
var msg = "Recieved MIDI event ";
for (i=0 ; i < event.data.length ; i++) {
msg += "0x" + event.data[i].toString(16) + " ";
}
console.log(msg);
}
entry.ondisconnect = null
entry.version = ALSA library version 1.0.25
entry.type = input
entry.name = Midi Through Port-0
entry.manufacturer =
entry.id = 14:0 Midi Through Port-0
entry.addEventListener = function addEventListener() { [native code] }
entry.removeEventListener = function removeEventListener() { [native code] }
entry.dispatchEvent = function dispatchEvent() { [native code] }
That is, the devices are recognized, and the onmidimessage handler appears to be set.
Yet, no events are detected when I press the keys on my MIDI keyboard.
What am I doing wrong?
