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
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
|
<!DOCTYPE html>
<html>
<head>
<title>
Test Constructor: IIRFilter
</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/audionodeoptions.js"></script>
</head>
<body>
<script id="layout-test-code">
let context;
let audit = Audit.createTaskRunner();
audit.define('initialize', (task, should) => {
context = initializeContext(should);
task.done();
});
audit.define('invalid constructor', (task, should) => {
testInvalidConstructor(should, 'IIRFilterNode', context);
task.done();
});
audit.define('default constructor', (task, should) => {
let prefix = 'node0';
let node = testDefaultConstructor(should, 'IIRFilterNode', context, {
prefix: prefix,
numberOfInputs: 1,
numberOfOutputs: 1,
channelCount: 2,
channelCountMode: 'max',
channelInterpretation: 'speakers',
constructorOptions: {feedforward: [1], feedback: [1, -.9]}
});
task.done();
});
audit.define('test AudioNodeOptions', (task, should) => {
testAudioNodeOptions(
should, context, 'IIRFilterNode',
{additionalOptions: {feedforward: [1, 1], feedback: [1, .5]}});
task.done();
});
audit.define('constructor options', (task, should) => {
let node;
let options = {feedback: [1, .5]};
should(
() => {
node = new IIRFilterNode(context, options);
},
'node = new IIRFilterNode(, ' + JSON.stringify(options) + ')')
.throw(TypeError);
options = {feedforward: [1, 0.5]};
should(
() => {
node = new IIRFilterNode(context, options);
},
'node = new IIRFilterNode(c, ' + JSON.stringify(options) + ')')
.throw(TypeError);
task.done();
});
// Test functionality of constructor. This is needed because we have no
// way of determining if the filter coefficients were were actually set
// appropriately.
// TODO(rtoy): This functionality test should be moved out to a separate
// file.
audit.define('functionality', (task, should) => {
let options = {feedback: [1, .5], feedforward: [1, 1]};
// Create two-channel offline context; sample rate and length are fairly
// arbitrary. Channel 0 contains the test output and channel 1 contains
// the expected output.
let sampleRate = 48000;
let renderLength = 0.125;
let testContext =
new OfflineAudioContext(2, renderLength * sampleRate, sampleRate);
// The test node uses the constructor. The reference node creates the
// same filter but uses the old factory method.
let testNode = new IIRFilterNode(testContext, options);
let refNode = testContext.createIIRFilter(
Float32Array.from(options.feedforward),
Float32Array.from(options.feedback));
let source = testContext.createOscillator();
source.connect(testNode);
source.connect(refNode);
let merger = testContext.createChannelMerger(
testContext.destination.channelCount);
testNode.connect(merger, 0, 0);
refNode.connect(merger, 0, 1);
merger.connect(testContext.destination);
source.start();
testContext.startRendering()
.then(function(resultBuffer) {
let actual = resultBuffer.getChannelData(0);
let expected = resultBuffer.getChannelData(1);
// The output from the two channels should be exactly equal
// because exactly the same IIR filter should have been created.
should(actual, 'Output of filter using new IIRFilter(...)')
.beEqualToArray(expected);
})
.then(() => task.done());
});
audit.run();
</script>
</body>
</html>
|
