1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
|
<!DOCTYPE html>
<html>
<head>
<title>
convolution-mono-mono.html
</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/webaudio/resources/audit-util.js"></script>
<script src="/webaudio/resources/audit.js"></script>
<script src="/webaudio/resources/convolution-testing.js"></script>
</head>
<body>
<script id="layout-test-code">
let audit = Audit.createTaskRunner();
// description("Tests ConvolverNode processing a mono channel with mono
// impulse response.");
// To test the convolver, we convolve two square pulses together to
// produce a triangular pulse. To verify the result is correct we
// check several parts of the result. First, we make sure the initial
// part of the result is zero (due to the latency in the convolver).
// Next, the triangular pulse should match the theoretical result to
// within some roundoff. After the triangular pulse, the result
// should be exactly zero, but round-off prevents that. We make sure
// the part after the pulse is sufficiently close to zero. Finally,
// the result should be exactly zero because the inputs are exactly
// zero.
audit.define('test', function(task, should) {
// Create offline audio context.
let context = new OfflineAudioContext(
2, sampleRate * renderLengthSeconds, sampleRate);
let squarePulse = createSquarePulseBuffer(context, pulseLengthFrames);
let trianglePulse =
createTrianglePulseBuffer(context, 2 * pulseLengthFrames);
let bufferSource = context.createBufferSource();
bufferSource.buffer = squarePulse;
let convolver = context.createConvolver();
convolver.normalize = false;
convolver.buffer = squarePulse;
bufferSource.connect(convolver);
convolver.connect(context.destination);
bufferSource.start(0);
context.startRendering()
.then(buffer => {
checkConvolvedResult(buffer, trianglePulse, should);
})
.then(task.done.bind(task));
;
});
audit.run();
</script>
</body>
</html>
|
