~ overflow ~

Problem:

Javascript floating point issues.

Solution:

It’s well known that javascript has major issues when it comes to precision math, even the simplest operations tend to be a nightmare. Although i was aware of that i suddenly found myself into another tricky thing with zeros on the left (eg: 025).

To avoid issues with javascript rounding issues I get all numbers converted to strings, stripping their floating point, this only works if all numbers are from the same precision or if you do a function do that, since there’s no rounding function (besides .toFixed) that does that proprietly.

So, in sum, 1.23 will be calculated as 123, eg:

var a = 1.23;
var b = 4.56;
a = parseInt(a.toString().replace(/\./g,"")); // 1.23 -> 123
b = parseInt(b.toString().replace(/\./g,"")); // 4.56 -> 4.56
var x = a + b; // = 579
x=x.toString();
return x.substr(0,x.length-2)+"."+x.substr(x.length-2);

Now that’s good, right…?? Apparently yes, but let’s do another example:

var a= 0.25;
a = parseInt(a.toString().replace(/\./g,"")); // 0.25 -> 025
var x = 1*a; // 1* 025 = 025  -- right? js will return 021
return x.substr(0,x.length-2)+"."+x.substr(x.length-2);

When there’s a zero on the left, javascript goes nuts. An easy fix would be:

while (x.toString().substr(0,1) == "0")
    x=x.substr(1);

and problem solved!

References:

w3Schools

webmasterworld

jibbering

Problem:

How to get audio bluetooth playback with my Encode PC-TV (ENLTV-FM) card.

Solution:

My bluetooth device is old and simply don’t work with the newest versions of BlueSoleil, so i’m stuck in this 1.6.x version, which totally sucks. It don’t work right with some specific devices and it’s also got a lot of bugs.

Just to have an idea, as far as i know, the current version is 6.x.

So, because of random issues I can’t have LIVE audio playback comming from the MIC of my onboard card.

Enabling ENLTV Timeshift option resolved the issue.