security-and-privacy/CanvasBlocker
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CanvasBlocker
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Improved audio API test

This commit is contained in:
kkapsner 2019-02-10 02:50:21 +01:00
parent ea30fb3370
commit ee02c8b999
2 changed files with 127 additions and 27 deletions
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23
test/audioTest.html
View File

@ -2,12 +2,31 @@
<html>
<head>
<title>Audio test</title>
<style></style>
<style>
table {
border-collapse: collapse;
width: 100%;
table-layout: auto;
}
table td {
border: 1px solid lightgray;
padding: 1px 5px;
}
</style>
</head>
<body>
<h1>Audio test</h1>
Expected result:
<ul>
<li>the hashes in each set should be the same</li>
<li>the hashes should vary between the sets</li>
<li>the &quot;empty&quot; hash should be 95476ffd46d1cd34fe8de83585c325df2b06019c852a5f6445200f57bc954a1b</li>
<li>hitting the refresh button should not change the values</li>
<li>reloading the page should change the values (depending on CanvasBlocker settings)</li>
</ul>
<div id="test">
Hashes: <ul class="hash"></ul>
Hashes: <table class="hashes"></table>
Sum: <span class="sum"></span>
<button>refresh</button>
</div>

131
test/audioTest.js
View File

@ -12,16 +12,48 @@
}
var container = document.getElementById("test");
var hashContainer = container.querySelector(".hashes");
var hashSets = Object.create(null);
var pxi_output;
var pxi_full_buffer;
function run_pxi_fp(){
function createSet(set){
if (!hashSets[set]){
var setContainer = document.createElement("tbody");
hashContainer.appendChild(setContainer);
var nameRow = document.createElement("tr");
setContainer.appendChild(nameRow);
var nameContainer = document.createElement("th");
nameRow.appendChild(nameContainer);
nameContainer.colSpan = 2;
nameContainer.textContent = set;
hashSets[set] = setContainer;
}
}
function displayData(data, set, title){
createSet(set);
var container = document.createElement("tr");
var titleNode = document.createElement("td");
titleNode.textContent = title;
container.appendChild(titleNode);
var hashNode = document.createElement("td");
hashNode.textContent = "calculating hash";
container.appendChild(hashNode);
crypto.subtle.digest("SHA-256", data).then(function(hash){
hashNode.textContent = byteArrayToHex(hash);
});
hashSets[set].appendChild(container);
}
function getAudioContext(frequency = 1e4){
var context = new window.OfflineAudioContext(2, 44100, 44100);
// Create oscillator
var pxi_oscillator = context.createOscillator();
pxi_oscillator.type = "triangle";
pxi_oscillator.frequency.value = 1e4;
pxi_oscillator.frequency.value = frequency;
// Create and configure compressor
var pxi_compressor = context.createDynamicsCompressor();
@ -35,32 +67,81 @@
// Connect nodes
pxi_oscillator.connect(pxi_compressor);
pxi_compressor.connect(context.destination);
// Start audio processing
pxi_oscillator.start(0);
return context;
}
function createEmptyData(){
var emptyArray = new Float32Array(44100);
displayData(emptyArray, "empty buffer", "no API involved");
var emptyContext = new OfflineAudioContext(1, 44100, 44100);
var emptyBuffer = emptyContext.createBuffer(1, 44100, 44100);
var emptyCopy = new Float32Array(44100);
emptyBuffer.copyFromChannel(emptyCopy, 0);
displayData(emptyCopy, "empty buffer", "copyFromChannel - first");
var emptyData = emptyBuffer.getChannelData(0);
displayData(emptyData, "empty buffer", "getChannelData - first");
displayData(emptyBuffer.getChannelData(0), "empty buffer", "getChannelData - second");
var emptyCopy2 = new Float32Array(44100);
emptyBuffer.copyFromChannel(emptyCopy2, 0);
displayData(emptyCopy2, "empty buffer", "copyFromChannel - second");
}
function createHashData(frequency = 1e4){
var context = getAudioContext(frequency);
var setName = " (" + frequency + " Hz)";
createSet(setName);
// Start audio processing
context.startRendering();
context.oncomplete = function(event) {
var str = "";
context.oncomplete = function(event){
var chunkTest = new Float32Array(44100);
var number = new Float32Array(100);
for (var i = 0; i < 44100; i += number.length){
event.renderedBuffer.copyFromChannel(number, 0, i);
chunkTest.set(number, i);
}
displayData(chunkTest, setName, "copyFromChannel - chunks");
var copyTest = new Float32Array(44100);
event.renderedBuffer.copyFromChannel(copyTest, 0);
displayData(copyTest, setName, "copyFromChannel - first");
var getTest = event.renderedBuffer.getChannelData(0);
var getTest2 = event.renderedBuffer.getChannelData(0);
var getTest3 = event.renderedBuffer.getChannelData(1);
Promise.all([getTest, getTest2, getTest3, copyTest].map(function(array){
return crypto.subtle.digest("SHA-256", array);
})).then(function(hashes){
container.querySelector(".hash").innerHTML = hashes.map(byteArrayToHex).map(function(hash){
return "<li>" + hash + "</li>";
}).join("");
});
var sum = 0;
for (var i = 4500; i < 5000; i += 1) {
sum += Math.abs(getTest[i]);
displayData(getTest, setName, "getChannelData - first");
displayData(event.renderedBuffer.getChannelData(0), setName, "getChannelData - second readout");
displayData(event.renderedBuffer.getChannelData(1), setName, "getChannelData - second channel");
var copyTest2 = new Float32Array(44100);
event.renderedBuffer.copyFromChannel(copyTest2, 0);
displayData(copyTest2, setName, "copyFromChannel - second");
if (frequency === 1e4){
var sum = 0;
for (var i = 4500; i < 5000; i += 1) {
sum += Math.abs(getTest[i]);
}
container.querySelector(".sum").textContent = sum;
}
container.querySelector(".sum").textContent = sum;
pxi_compressor.disconnect();
};
}
run_pxi_fp();
container.querySelector("button").addEventListener("click", run_pxi_fp);
function createAllHashData(){
hashContainer.innerHTML = "";
hashSets = Object.create(null);
createEmptyData();
createHashData(1e4);
createHashData(2e4);
}
createAllHashData();
container.querySelector("button").addEventListener("click", createAllHashData);
}());