1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/content/media/webaudio/test/test_AudioBuffer.html Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,105 @@
1.4 +<!DOCTYPE HTML>
1.5 +<html>
1.6 +<head>
1.7 + <title>Test whether we can create an AudioContext interface</title>
1.8 + <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
1.9 + <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
1.10 +</head>
1.11 +<body>
1.12 +<pre id="test">
1.13 +<script src="webaudio.js" type="text/javascript"></script>
1.14 +<script class="testbody" type="text/javascript">
1.15 +
1.16 +SimpleTest.waitForExplicitFinish();
1.17 +addLoadEvent(function() {
1.18 + var context = new AudioContext();
1.19 + var buffer = context.createBuffer(2, 2048, context.sampleRate);
1.20 + SpecialPowers.gc(); // Make sure that our channels are accessible after GC
1.21 + ok(buffer, "Buffer was allocated successfully");
1.22 + is(buffer.sampleRate, context.sampleRate, "Correct sample rate");
1.23 + is(buffer.length, 2048, "Correct length");
1.24 + ok(Math.abs(buffer.duration - 2048 / context.sampleRate) < 0.0001, "Correct duration");
1.25 + is(buffer.numberOfChannels, 2, "Correct number of channels");
1.26 + for (var i = 0; i < buffer.numberOfChannels; ++i) {
1.27 + var buf = buffer.getChannelData(i);
1.28 + ok(buf, "Buffer index " + i + " exists");
1.29 + ok(buf instanceof Float32Array, "Result is a typed array");
1.30 + is(buf.length, buffer.length, "Correct length");
1.31 + var foundNonZero = false;
1.32 + for (var j = 0; j < buf.length; ++j) {
1.33 + if (buf[j] != 0) {
1.34 + foundNonZero = true;
1.35 + break;
1.36 + }
1.37 + buf[j] = j;
1.38 + }
1.39 + ok(!foundNonZero, "Buffer " + i + " should be initialized to 0");
1.40 + }
1.41 +
1.42 + // Now test copying the channel data out of a normal buffer
1.43 + var copy = new Float32Array(100);
1.44 + buffer.copyFromChannel(copy, 0, 1024);
1.45 + for (var i = 0; i < copy.length; ++i) {
1.46 + is(copy[i], 1024 + i, "Correct sample");
1.47 + }
1.48 +
1.49 + // Test copying the channel data out of a playing buffer
1.50 + var srcNode = context.createBufferSource();
1.51 + srcNode.buffer = buffer;
1.52 + srcNode.start(0);
1.53 + copy = new Float32Array(100);
1.54 + buffer.copyFromChannel(copy, 0, 1024);
1.55 + for (var i = 0; i < copy.length; ++i) {
1.56 + is(copy[i], 1024 + i, "Correct sample");
1.57 + }
1.58 +
1.59 + // Test copying to the channel data
1.60 + var newData = new Float32Array(200);
1.61 + buffer.copyToChannel(newData, 0, 100);
1.62 + var changedData = buffer.getChannelData(0);
1.63 + for (var i = 0; i < changedData.length; ++i) {
1.64 + if (i < 100 || i >= 300) {
1.65 + is(changedData[i], i, "Untouched sample");
1.66 + } else {
1.67 + is(changedData[i], 0, "Correct sample");
1.68 + }
1.69 + }
1.70 +
1.71 + // Now, neuter the array buffer
1.72 + var worker = new Worker("audioBufferSourceNodeNeutered_worker.js");
1.73 + var data = buffer.getChannelData(0).buffer;
1.74 + worker.postMessage(data, [data]);
1.75 + SpecialPowers.gc();
1.76 +
1.77 + expectException(function() {
1.78 + buffer.copyFromChannel(copy, 0, 1024);
1.79 + }, DOMException.INDEX_SIZE_ERR);
1.80 +
1.81 + expectException(function() {
1.82 + buffer.copyToChannel(newData, 0, 100);
1.83 + }, DOMException.INDEX_SIZE_ERR);
1.84 +
1.85 + expectException(function() {
1.86 + context.createBuffer(2, 2048, 7999);
1.87 + }, DOMException.INDEX_SIZE_ERR);
1.88 + expectException(function() {
1.89 + context.createBuffer(2, 2048, 192001);
1.90 + }, DOMException.INDEX_SIZE_ERR);
1.91 + context.createBuffer(2, 2048, 8000); // no exception
1.92 + context.createBuffer(2, 2048, 192000); // no exception
1.93 + context.createBuffer(32, 2048, 48000); // no exception
1.94 + // Null length
1.95 + expectException(function() {
1.96 + context.createBuffer(2, 0, 48000);
1.97 + }, DOMException.INDEX_SIZE_ERR);
1.98 + // Null number of channels
1.99 + expectException(function() {
1.100 + context.createBuffer(0, 2048, 48000);
1.101 + }, DOMException.INDEX_SIZE_ERR);
1.102 + SimpleTest.finish();
1.103 +});
1.104 +
1.105 +</script>
1.106 +</pre>
1.107 +</body>
1.108 +</html>
