The Tor Browser: content/media/webaudio/test/test_AudioBuffer.html@b8a032363ba2 (annotated)

content/media/webaudio/test/test_AudioBuffer.html@b8a032363ba2 (annotated)

content/media/webaudio/test/test_AudioBuffer.html

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 <!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, neuter the array buffer
   var worker = new Worker("audioBufferSourceNodeNeutered_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>

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content/media/webaudio/test/test_AudioBuffer.html@b8a032363ba2 (annotated)

content/media/webaudio/test/test_AudioBuffer.html