Howto achieve best possible playback timing

[Jonas Thörnvall]

I must stop poll and do some more serious playback, but i am not sure how.

function play(){
var lastelement=track[0].midiMess.length;
var x=0;var time=0; var starttime=0; var clock=0;
time=performance.now();
starttime=time;
while(x<lastelement){
var time=performance.now();
clock=time-starttime;
if(track[0].midiMess[x].time<=clock){
var noteOnMessage = [track[0].midiMess[x].data0,track[0].midiMess[x].data1,track[0].midiMess[x].data2];
output.send(noteOnMessage);
x++;
}
}
}

Well this is probably not ideal either, but better? If someone show me away to get the playup of events as accurate as possible i would be thankful.

function diffPlay(){
var lastelement=track[0].midiMess.length;
var x=0;
var waitEv=new Array();
noteOnMessage=new Array();

//INIT FIRST EVENT
waitEv[x]=track[0].midiMess[x].time;
var noteOnMessage[x] = [track[0].midiMess[x].data0,track[0].midiMess[x].data1,
track[0].midiMess[x].data2];
x++;

//LOOP THRU ALL EVENTS CALCULATE TIMEDIFFERENCES
while(x<lastelement){
waitEv[x]=track[0].midiMess[x].time-track[0].midiMess[x-1].time;
x++;
var noteOnMessage[x] [track[0].midiMess[x].data0,track[0].midiMess[x].data1,
track[0].midiMess[x].data2];
}
y=0;
while(y<lastelement){
setTimeout(playEvent,waitEv[y]);
y++;
}
}

function playEvent(){
output.send(noteOnMessage[y]);
}

[Jonas Thörnvall]

Well i can see the looping around timout is just silly, so i probably should use setInterval but with different timings.

[Jonas Thörnvall]

function play(){

lastelement=track[0].midiMess.length;
var x=0;
var waitEv=new Array();

//INIT FIRST EVENT
waitEv[x]=track[0].midiMess[x].time;

x++;

//LOOP THRU ALL EVENTS CALCULATE TIMEDIFFERENCES
while(x<lastelement){
waitEv[x]=track[0].midiMess[x].time-track[0].midiMess[x-1].time;
x++;
}

y=0;
playin=setInterval(playEvent,waitEv[y]);
}

function playEvent(){
noteOnMessage = [track[0].midiMess[y].data0,track[0].midiMess[y].data1,track[0].midiMess[y].data2];
output.send(noteOnMessage);
y++;
if (y==lastelement) clearInterval(playin);
}

[Jonas Thörnvall]

Kind of weird that setinterval do not take an array as arguments....
So how do one do?

[Jonas Thörnvall]

It seem i should probably use timeout my variable in setInterval only set value one time? waitEv[y] does not care that y arrayslot change during its execution of interval?

playin=setInterval(playEvent,waitEv[y]);