content/media/webaudio/test/test_AudioBuffer.html@b8a032363ba2
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
1 <!DOCTYPE HTML>
2 <html>
3 <head>
4 <title>Test whether we can create an AudioContext interface</title>
5 <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
6 <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
7 </head>
8 <body>
9 <pre id="test">
10 <script src="webaudio.js" type="text/javascript"></script>
11 <script class="testbody" type="text/javascript">
13 SimpleTest.waitForExplicitFinish();
14 addLoadEvent(function() {
15 var context = new AudioContext();
16 var buffer = context.createBuffer(2, 2048, context.sampleRate);
17 SpecialPowers.gc(); // Make sure that our channels are accessible after GC
18 ok(buffer, "Buffer was allocated successfully");
19 is(buffer.sampleRate, context.sampleRate, "Correct sample rate");
20 is(buffer.length, 2048, "Correct length");
21 ok(Math.abs(buffer.duration - 2048 / context.sampleRate) < 0.0001, "Correct duration");
22 is(buffer.numberOfChannels, 2, "Correct number of channels");
23 for (var i = 0; i < buffer.numberOfChannels; ++i) {
24 var buf = buffer.getChannelData(i);
25 ok(buf, "Buffer index " + i + " exists");
26 ok(buf instanceof Float32Array, "Result is a typed array");
27 is(buf.length, buffer.length, "Correct length");
28 var foundNonZero = false;
29 for (var j = 0; j < buf.length; ++j) {
30 if (buf[j] != 0) {
31 foundNonZero = true;
32 break;
33 }
34 buf[j] = j;
35 }
36 ok(!foundNonZero, "Buffer " + i + " should be initialized to 0");
37 }
39 // Now test copying the channel data out of a normal buffer
40 var copy = new Float32Array(100);
41 buffer.copyFromChannel(copy, 0, 1024);
42 for (var i = 0; i < copy.length; ++i) {
43 is(copy[i], 1024 + i, "Correct sample");
44 }
46 // Test copying the channel data out of a playing buffer
47 var srcNode = context.createBufferSource();
48 srcNode.buffer = buffer;
49 srcNode.start(0);
50 copy = new Float32Array(100);
51 buffer.copyFromChannel(copy, 0, 1024);
52 for (var i = 0; i < copy.length; ++i) {
53 is(copy[i], 1024 + i, "Correct sample");
54 }
56 // Test copying to the channel data
57 var newData = new Float32Array(200);
58 buffer.copyToChannel(newData, 0, 100);
59 var changedData = buffer.getChannelData(0);
60 for (var i = 0; i < changedData.length; ++i) {
61 if (i < 100 || i >= 300) {
62 is(changedData[i], i, "Untouched sample");
63 } else {
64 is(changedData[i], 0, "Correct sample");
65 }
66 }
68 // Now, neuter the array buffer
69 var worker = new Worker("audioBufferSourceNodeNeutered_worker.js");
70 var data = buffer.getChannelData(0).buffer;
71 worker.postMessage(data, [data]);
72 SpecialPowers.gc();
74 expectException(function() {
75 buffer.copyFromChannel(copy, 0, 1024);
76 }, DOMException.INDEX_SIZE_ERR);
78 expectException(function() {
79 buffer.copyToChannel(newData, 0, 100);
80 }, DOMException.INDEX_SIZE_ERR);
82 expectException(function() {
83 context.createBuffer(2, 2048, 7999);
84 }, DOMException.INDEX_SIZE_ERR);
85 expectException(function() {
86 context.createBuffer(2, 2048, 192001);
87 }, DOMException.INDEX_SIZE_ERR);
88 context.createBuffer(2, 2048, 8000); // no exception
89 context.createBuffer(2, 2048, 192000); // no exception
90 context.createBuffer(32, 2048, 48000); // no exception
91 // Null length
92 expectException(function() {
93 context.createBuffer(2, 0, 48000);
94 }, DOMException.INDEX_SIZE_ERR);
95 // Null number of channels
96 expectException(function() {
97 context.createBuffer(0, 2048, 48000);
98 }, DOMException.INDEX_SIZE_ERR);
99 SimpleTest.finish();
100 });
102 </script>
103 </pre>
104 </body>
105 </html>
