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Many small improvements (see full commit message). * Better preamble detection to skip most of the messages we'll likely not be able to decode. * A Phase correction algorithm that improves the recognition compared to the previous algorithm used. * Javascript output in debug mode, and a debug.html file that can be used in order to see graphically undecoded samples. * Ability to detect cross-read messages, that are, messages that happen to start and end across two different reads from the device or file. * A few bugx fixed. * README improved.
2013-01-26 01:07:43 +01:00
<!DOCTYPE html>
<html>
<body>
<head>
<script>
var frames = [];
A few bugs fixed in debug.html.
2013-01-27 21:42:40 +01:00
var currentFrame = 0;
Many small improvements (see full commit message). * Better preamble detection to skip most of the messages we'll likely not be able to decode. * A Phase correction algorithm that improves the recognition compared to the previous algorithm used. * Javascript output in debug mode, and a debug.html file that can be used in order to see graphically undecoded samples. * Ability to detect cross-read messages, that are, messages that happen to start and end across two different reads from the device or file. * A few bugx fixed. * README improved.
2013-01-26 01:07:43 +01:00
var modes_checksum_table = [
0x3935ea, 0x1c9af5, 0xf1b77e, 0x78dbbf, 0xc397db, 0x9e31e9, 0xb0e2f0, 0x587178,
0x2c38bc, 0x161c5e, 0x0b0e2f, 0xfa7d13, 0x82c48d, 0xbe9842, 0x5f4c21, 0xd05c14,
0x682e0a, 0x341705, 0xe5f186, 0x72f8c3, 0xc68665, 0x9cb936, 0x4e5c9b, 0xd8d449,
0x939020, 0x49c810, 0x24e408, 0x127204, 0x093902, 0x049c81, 0xfdb444, 0x7eda22,
0x3f6d11, 0xe04c8c, 0x702646, 0x381323, 0xe3f395, 0x8e03ce, 0x4701e7, 0xdc7af7,
0x91c77f, 0xb719bb, 0xa476d9, 0xadc168, 0x56e0b4, 0x2b705a, 0x15b82d, 0xf52612,
0x7a9309, 0xc2b380, 0x6159c0, 0x30ace0, 0x185670, 0x0c2b38, 0x06159c, 0x030ace,
0x018567, 0xff38b7, 0x80665f, 0xbfc92b, 0xa01e91, 0xaff54c, 0x57faa6, 0x2bfd53,
0xea04ad, 0x8af852, 0x457c29, 0xdd4410, 0x6ea208, 0x375104, 0x1ba882, 0x0dd441,
0xf91024, 0x7c8812, 0x3e4409, 0xe0d800, 0x706c00, 0x383600, 0x1c1b00, 0x0e0d80,
0x0706c0, 0x038360, 0x01c1b0, 0x00e0d8, 0x00706c, 0x003836, 0x001c1b, 0xfff409,
0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000,
0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000,
0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000
];
function modesChecksum(frame) {
var crc = 0;
var bits = frame.bits;
var offset = (bits == 112) ? 0 : (112-56);
for(var j = 0; j < bits; j++) {
var byte = j/8;
var bit = j%8;
var bitmask = 1 << (7-bit);
/* If bit is set, xor with corresponding table entry. */
if (frame.hex.charCodeAt(byte) & bitmask)
crc ^= modes_checksum_table[j+offset];
}
return crc; /* 24 bit checksum. */
}
function getFrameChecksum(frame) {
var res = "";
for (j = 0; j < frame.hex.length; j++) {
var val = frame.hex.charCodeAt(j);
var h = val.toString(16);
if (h.length == 1) h = "0"+h;
res += h;
}
return res;
}
function displayFrame(i) {
var div = document.getElementById("frame");
var msgbits = 8+112;
var frame = frames[i];
var padding = frame.mag.length - msgbits*2;
/* Remove the old representation. */
var nodes = div.childNodes.length;
for(var j = 0; j < nodes; j++) {
div.removeChild(div.firstChild);
}
/* Display the new one. */
for (var j = -padding; j < msgbits*2+padding; j++) {
var m = frame.mag[j+padding];
var type;
if (j < 0) type = "noise";
if (j >= 0 && j < 16) type = "pre";
if (j >= 16) {
if (!(j % 2)) {
var next = frame.mag[j+padding+1];
if (m > next)
type = "one";
else
type = "zero";
}
var bit = (j-16)/2;
if (bit == frame.fix1 ||
bit == frame.fix2)
type = "err";
}
var sample = document.createElement("div");
sample.setAttribute("class","sample "+type);
sample.setAttribute("title","sample "+j+" ("+m+")");
sample.style.left = ""+((j+padding)*4)+"px";
sample.style.height = ""+(m/256)+"px";
div.appendChild(sample);
}
document.getElementById("info").innerHTML =
"#"+currentFrame+" "+frame.descr+"<br>"+
"Bits:"+frame.bits+"<br>"+
"DF : "+(frame.hex.charCodeAt(0) >> 3)+"<br>"+
"fix1: "+frame.fix1+"<br>"+
"fix2: "+frame.fix2+"<br>"+
"hex : "+getFrameChecksum(frame)+"<br>"+
"crc (computed): "+modesChecksum(frame).toString(16)+"<br>";
}
function recomputeHex(frame) {
var padding = frame.mag.length - (112+8)*2;
var b = [];
var hex = "";
/* Get bits */
for (var j = 0; j < frame.bits*2; j += 2) {
var bit;
var l = frame.mag[padding+j+16];
var r = frame.mag[padding+j+1+16];
if (l > r)
bit = 1;
else
bit = 0;
b.push(bit);
}
/* Pack into bytes */
for (j = 0; j < frame.bits; j+= 8) {
hex += String.fromCharCode(
b[j]<<7 |
b[j+1]<<6 |
b[j+2]<<5 |
b[j+3]<<4 |
b[j+4]<<3 |
b[j+5]<<2 |
b[j+6]<<1 |
b[j+7]);
}
frame.hex = hex;
}
window.onload = function() {
document.getElementById("next").onclick = function() {
if (currentFrame != frames.length-1) currentFrame++;
displayFrame(currentFrame);
}
document.getElementById("prev").onclick = function() {
if (currentFrame != 0) currentFrame--;
displayFrame(currentFrame);
}
document.getElementById("re").onclick = function() {
recomputeHex(frames[currentFrame]);
displayFrame(currentFrame);
}
displayFrame(currentFrame);
}
</script>
<script src="frames.js"></script>
<style>
#frame {
width: 1024px;
height: 255px;
border: 1px #aaa solid;
position: relative;
}
.sample {
position: absolute;
bottom: 0px;
}
.pre {
width:4px;
background-color: orange;
}
.one {
width:4px;
background-color: #0000cc;
}
.zero {
width:4px;
background-color: #aaaaaa;
}
.err {
width:4px;
background-color: #cc6666;
}
.noise {
width:2px;
background-color: #ffffff;
border: 1px #aaa dotted;
}
</style>
</head>
<div id="frame">
</div>
<pre id="info">
</pre>
<input type="button" id="prev" value="Prev frame">
<input type="button" id="next" value="Next frame">
<input type="button" id="re" value="Recompute Hex">
</body>
</html>
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