cobookman / html5.micio Goto Github PK

Hi,

setInterval is usually pretty poor for timing things.

You should get better performance by using requestAnimationFrame(). This will run at a maximum of 60fps, depending on how "busy" the rest of the system is. The latter qualification is also true of setInterval of course since javascript is single threaded.

In general you would do something like this:

function requestInterval(fn, ms) {
  var handle = {value: null};
  var timeStart = new Date().getTime();
  var rafFn = function() {
    var timeNow = new Date().getTime();
    if ( timeNow >= timeStart + ms ) {
      fn();
      timeStart = timeNow; // or maybe timeStart += ms?
    }
    handle.value = requestAnimationFrame(rafFn);
  };
  handle.value = requestAnimationFrame(rafFn);
  return handle;
}

// use it:
var handle = requestInterval(function() {console.log(Date.now());}, 1000);

// cancel it:
cancelAnimationFrame(handle.value);

I haven't tested that code, and I also assume that requestAnimationFrame is unprefixed. There are decent shims out there you could look at to, such as:

https://gist.github.com/joelambert/1002116

I stumbled on this project through a ⭐ from @zemirco...

I'm curious if it is possible to port http://www.whence.com/minimodem/ (http://github.com/kamalmostafa/minimodem) from C to JavaScript (or some subset of functionality) to allow communication between a browser and a device connected to the browser's host system's hardware audio port.

Do you have any thoughts on this @kamalmostafa?

I'm happy to see this, I think adding this kind of functionality to JavaScript is important. When I first saw the project, I thought of the HiJack (http://web.eecs.umich.edu/~prabal/projects/hijack/) project which is building open-hardware and native libraries for the same purpose. Pooling resources with them might help.

Can you write out your milestones for completing this? I'd like to contribute. If you lay out what steps you want to complete, I can start contributing appropriately.