content/media/webaudio/test/test_channelSplitterNodeWithVolume.html@44a2da4a2ab2
content/media/webaudio/test/test_channelSplitterNodeWithVolume.html
Fri, 16 Jan 2015 04:50:19 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Fri, 16 Jan 2015 04:50:19 +0100
- branch
- TOR_BUG_9701
- changeset 13
- 44a2da4a2ab2
- permissions
- -rw-r--r--
Replace accessor implementation with direct member state manipulation, by
request https://trac.torproject.org/projects/tor/ticket/9701#comment:32
1 <!DOCTYPE HTML>
2 <html>
3 <head>
4 <title>Test ChannelSplitterNode</title>
5 <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
6 <script type="text/javascript" src="webaudio.js"></script>
7 <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
8 </head>
9 <body>
10 <pre id="test">
11 <script class="testbody" type="text/javascript">
13 // We do not use our generic graph test framework here because
14 // the splitter node is special in that it creates multiple
15 // output ports.
17 SimpleTest.waitForExplicitFinish();
18 addLoadEvent(function() {
19 var context = new AudioContext();
20 var buffer = context.createBuffer(4, 2048, context.sampleRate);
21 var expectedBuffer = context.createBuffer(4, 2048, context.sampleRate);
22 for (var j = 0; j < 4; ++j) {
23 for (var i = 0; i < 2048; ++i) {
24 buffer.getChannelData(j)[i] = Math.sin(440 * 2 * (j + 1) * Math.PI * i / context.sampleRate);
25 expectedBuffer.getChannelData(j)[i] = buffer.getChannelData(j)[i] / 2;
26 }
27 }
28 var emptyBuffer = context.createBuffer(1, 2048, context.sampleRate);
30 var destination = context.destination;
32 var source = context.createBufferSource();
34 var splitter = context.createChannelSplitter();
35 is(splitter.channelCount, 2, "splitter node has 2 input channels by default");
36 is(splitter.channelCountMode, "max", "Correct channelCountMode for the splitter node");
37 is(splitter.channelInterpretation, "speakers", "Correct channelCountInterpretation for the splitter node");
39 source.buffer = buffer;
40 var gain = context.createGain();
41 gain.gain.value = 0.5;
42 source.connect(gain);
43 gain.connect(splitter);
45 var channelsSeen = 0;
46 function createHandler(i) {
47 return function(e) {
48 is(e.inputBuffer.numberOfChannels, 1, "Correct input channel count");
49 if (i < 4) {
50 compareBuffers(e.inputBuffer.getChannelData(0), expectedBuffer.getChannelData(i));
51 } else {
52 compareBuffers(e.inputBuffer.getChannelData(0), emptyBuffer.getChannelData(0));
53 }
54 e.target.onaudioprocess = null;
55 ++channelsSeen;
57 if (channelsSeen == 6) {
58 SimpleTest.finish();
59 }
60 };
61 }
63 for (var i = 0; i < 6; ++i) {
64 var sp = context.createScriptProcessor(2048, 1);
65 splitter.connect(sp, i);
66 sp.onaudioprocess = createHandler(i);
67 sp.connect(destination);
68 }
70 source.start(0);
71 });
73 </script>
74 </pre>
75 </body>
76 </html>
