<!DOCTYPEHTML>
<html>
<head>
<title>Test whether we can create an AudioContext interface</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
</head>
<body>
<pre id="test">
<script src="webaudio.js" type="text/javascript"></script>
<script class="testbody" type="text/javascript">
SimpleTest.waitForExplicitFinish();
addLoadEvent(function() { var context = new AudioContext(); var buffer = context.createBuffer(2, 2048, context.sampleRate);
SpecialPowers.gc(); // Make sure that our channels are accessible after GC
ok(buffer, "Buffer was allocated successfully");
is(buffer.sampleRate, context.sampleRate, "Correct sample rate");
is(buffer.length, 2048, "Correct length");
ok(Math.abs(buffer.duration - 2048 / context.sampleRate) < 0.0001, "Correct duration");
is(buffer.numberOfChannels, 2, "Correct number of channels");
for (var i = 0; i < buffer.numberOfChannels; ++i) { var buf = buffer.getChannelData(i);
ok(buf, "Buffer index " + i + " exists");
ok(buf instanceof Float32Array, "Result is a typed array");
is(buf.length, buffer.length, "Correct length"); var foundNonZero = false;
for (var j = 0; j < buf.length; ++j) {
if (buf[j] != 0) {
foundNonZero = true;
break;
}
buf[j] = j;
}
ok(!foundNonZero, "Buffer " + i + " should be initialized to 0");
}
// Now test copying the channel data out of a normal buffer var copy = new Float32Array(100);
buffer.copyFromChannel(copy, 0, 1024);
for (var i = 0; i < copy.length; ++i) {
is(copy[i], 1024 + i, "Correct sample");
}
// Test copying the channel data out of a playing buffer var srcNode = context.createBufferSource();
srcNode.buffer = buffer;
srcNode.start(0);
copy = new Float32Array(100);
buffer.copyFromChannel(copy, 0, 1024);
for (var i = 0; i < copy.length; ++i) {
is(copy[i], 1024 + i, "Correct sample");
}
// Test copying to the channel data var newData = new Float32Array(200);
buffer.copyToChannel(newData, 0, 100); var changedData = buffer.getChannelData(0);
for (var i = 0; i < changedData.length; ++i) {
if (i < 100 || i >= 300) {
is(changedData[i], i, "Untouched sample");
} else {
is(changedData[i], 0, "Correct sample");
}
}
// Now, detach the array buffer var worker = new Worker("audioBufferSourceNodeDetached_worker.js"); var data = buffer.getChannelData(0).buffer;
worker.postMessage(data, [data]);
SpecialPowers.gc();
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