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<html>
<head>
<meta charset="utf-8">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<pre>
Wasm audio FIR. Version: 0.1
</pre>
<script type='text/javascript'>
var Module = {};
fetch('index.wasm')
.then(response =>
response.arrayBuffer()
).then(buffer => {
Module.canvas = document.getElementById("canvas");
Module.wasmBinary = buffer;
var script = document.createElement('script');
script.src = "index.js";
script.onload = function() {
console.log("Emscripten boilerplate loaded.");
get_cutoff_freq = Module.cwrap("get_cutoff_freq","number",[]);
set_cutoff_plus_1k= Module.cwrap("set_cutoff_plus_1k",[],[]);
set_cutoff_minus_1k = Module.cwrap("set_cutoff_minus_1k",[],[]);
get_tap_number = Module.cwrap("get_tap_number","number",[]);
recalculate_fir = Module.cwrap("recalculate_fir",'number',['float']);
start_loop = Module.cwrap("start_loop",'number',[]);
stop_loop = Module.cwrap("stop_loop",'number',[]);
set_tap_number_plus_10 = Module.cwrap("set_tap_number_plus_10",[],[]);
set_tap_number_minus_10 = Module.cwrap("set_tap_number_minus_10",[],[]);
var setCutoffFrequency = document.querySelector('.setCutoffFrequency')
var getCutoffFrequency = document.querySelector('.getCutoffFrequency')
var outSetCutoffFrequency = document.querySelector('.outSetCutoffFrequency')
var minusNumberTaps = document.querySelector('.minusNumberTaps')
var plusNumberTaps = document.querySelector('.pplusNumberTaps')
var outSetNumberTaps = document.querySelector('.outSetNumberTaps')
var recalculateFir = document.querySelector('.recalculateFir')
var outCoeficients = document.querySelector('.outCoeficients')
//outSetCutoffFrequency.value = get_cutoff_freq();
//outSetCutoffFrequency.value = "Hello";
//outSetNumberTaps.value = get_tap_number();
document.querySelector("#recalculateFir").onclick = function() {
console.log("Oh noe");
//https://stackoverflow.com/questions/17883799/how-to-handle-passing-returning-array-pointers-to-emscripten-compiled-code
function cArray(size) {
var offset = Module._malloc(size * 8);
Module.HEAPF64.set(new Float64Array(size), offset / 8);
return {
"data": Module.HEAPF64.subarray(offset / 8, offset / 8 + size),
"offset": offset
}
}
myArray = cArray(200);
var result = recalculate_fir(myArray.offset);
var arr = Array(myArray.data.slice(1,result-1));
arr = arr.map(function(item){
return item.map(function(num){
return parseFloat(num.toFixed(5));
});
});
outCoeficients.value = arr;
}
document.querySelector("#getCutoffFrequency").onclick = function() {
console.log("--1kHz");
set_cutoff_minus_1k();
var result=get_cutoff_freq();
outSetCutoffFrequency.value = result;
}
document.querySelector("#setCutoffFrequency").onclick = function() {
console.log("+1kHz");
set_cutoff_plus_1k();
var result=get_cutoff_freq();
outSetCutoffFrequency.value = result;
}
document.querySelector("#plusNumberTaps").onclick = function() {
console.log("Oh noe");
set_tap_number_plus_10();
var result = get_tap_number()
outSetNumberTaps.value = result;
}
document.querySelector("#minusNumberTaps").onclick = function() {
console.log("Oh noe");
set_tap_number_minus_10();
var result = get_tap_number()
outSetNumberTaps.value = result;
}
}
document.body.appendChild(script);
});
</script>
<div align="center">
<canvas id="canvas" ></canvas>
</div>
<button id="setCutoffFrequency" type="button">Cutoff +1KHz</button>
<button id="getCutoffFrequency" type="button">Cutoff -1Khz</button>
<textarea class="outSetCutoffFrequency"></textarea>
<button id="plusNumberTaps" type="button">Tap N+10</button>
<button id="minusNumberTaps" type="button">Tap N-10</button>
<textarea class="outSetNumberTaps"></textarea>
<button id="recalculateFir" type="button">Calc</button>
<textarea class="outCoeficients"></textarea>
<script>
</script>
<pre>
If no recording, check developer console(Ctrl+Shift+I) or add domain (http://wasm.main.lv) to chrome://flags/#unsafely-treat-insecure-origin-as-secure
Workflow(r->s->q)
Supported keys:
r - record sound buffer
s - play recorded buffer
q - applay fir filter
</pre>
<pre>
Changelog:
v0.1 - initial release
</pre>
</body>
</html>
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