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+<!DOCTYPE HTML>
+<html>
+<head>
+ <title>Test whether we can create an AudioContext interface</title>
+ <script type="text/javascript" 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();
+
+ expectException(function() {
+ buffer.copyFromChannel(copy, 0, 1024);
+ }, DOMException.INDEX_SIZE_ERR);
+
+ expectException(function() {
+ buffer.copyToChannel(newData, 0, 100);
+ }, DOMException.INDEX_SIZE_ERR);
+
+ expectException(function() {
+ context.createBuffer(2, 2048, 7999);
+ }, DOMException.INDEX_SIZE_ERR);
+ expectException(function() {
+ context.createBuffer(2, 2048, 192001);
+ }, DOMException.INDEX_SIZE_ERR);
+ context.createBuffer(2, 2048, 8000); // no exception
+ context.createBuffer(2, 2048, 192000); // no exception
+ context.createBuffer(32, 2048, 48000); // no exception
+ // Null length
+ expectException(function() {
+ context.createBuffer(2, 0, 48000);
+ }, DOMException.INDEX_SIZE_ERR);
+ // Null number of channels
+ expectException(function() {
+ context.createBuffer(0, 2048, 48000);
+ }, DOMException.INDEX_SIZE_ERR);
+ SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>