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Issue 2895963003: Apply layout-test-tidy to LayoutTests/webaudio (Closed)
Patch Set: Created 3 years, 7 months ago
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1 <!doctype html> 1 <!DOCTYPE html>
2 <html> 2 <html>
3 <head> 3 <head>
4 <title>Test setTargetAtTime Approach to Limit</title> 4 <title>
5 Test setTargetAtTime Approach to Limit
6 </title>
5 <script src="../../resources/testharness.js"></script> 7 <script src="../../resources/testharness.js"></script>
6 <script src="../../resources/testharnessreport.js"></script> 8 <script src="../../resources/testharnessreport.js"></script>
7 <script src="../resources/audit-util.js"></script> 9 <script src="../resources/audit-util.js"></script>
8 <script src="../resources/audit.js"></script> 10 <script src="../resources/audit.js"></script>
9 <script src="../resources/audioparam-testing.js"></script> 11 <script src="../resources/audioparam-testing.js"></script>
10 </head> 12 </head>
13 <body>
14 <script id="layout-test-code">
15 let audit = Audit.createTaskRunner();
11 16
12 <body> 17 audit.define('approach 1', (task, should) => {
13 <script> 18 let sampleRate = 48000;
14 19
15 var audit = Audit.createTaskRunner(); 20 // A really short time constant so that setTargetAtTime approaches the
21 // limiting value well before the end of the test.
22 let timeConstant = 0.001;
16 23
17 audit.define("approach 1", (task, should) => { 24 // Find the time where setTargetAtTime is close enough to the limit.
18 var sampleRate = 48000; 25 // Since we're approaching 1, use a value of eps smaller than
19 26 // kSetTargetThreshold (5e-7) in AudioParamTimeline.cpp. This is to
20 // A really short time constant so that setTargetAtTime approaches the l imiting value well 27 // account for round-off in the actual implementation (which uses a
21 // before the end of the test. 28 // filter and not the formula.)
22 var timeConstant = 0.001; 29 let limitThreshold = 1e-7;
23
24 // Find the time where setTargetAtTime is close enough to the limit. Si nce we're
25 // approaching 1, use a value of eps smaller than kSetTargetThreshold (5 e-7) in
26 // AudioParamTimeline.cpp. This is to account for round-off in the actu al implementation
27 // (which uses a filter and not the formula.)
28 var limitThreshold = 1e-7;
29 30
30 runTest(should, { 31 runTest(should, {
31 sampleRate: sampleRate, 32 sampleRate: sampleRate,
32 v0: 0, 33 v0: 0,
33 v1: 1, 34 v1: 1,
34 timeConstant: timeConstant, 35 timeConstant: timeConstant,
35 eps: limitThreshold, 36 eps: limitThreshold,
36 // Experimentally determined 37 // Experimentally determined
37 threshold: 2.4e-5 38 threshold: 2.4e-5
38 }).then(() => task.done()); 39 }).then(() => task.done());
39 }) 40 })
40 41
41 audit.define("approach 0", (task, should) => { 42 audit.define('approach 0', (task, should) => {
42 // Use the equation for setTargetAtTime to figure out when we are close to 0: 43 // Use the equation for setTargetAtTime to figure out when we are close
44 // to 0:
43 // 45 //
44 // v(t) = exp(-t/tau) 46 // v(t) = exp(-t/tau)
45 // 47 //
46 // So find t such that exp(-t/tau) <= eps. Thus t >= - tau * log(eps). 48 // So find t such that exp(-t/tau) <= eps. Thus t >= - tau * log(eps).
47 // 49 //
48 // For eps, use 1e-20 (kSetTargetZeroThreshold in AudioParamTimeline.cpp ). 50 // For eps, use 1e-20 (kSetTargetZeroThreshold in
51 // AudioParamTimeline.cpp).
49 52
50 var sampleRate = 48000; 53 let sampleRate = 48000;
51 54
52 // A really short time constant so that setTargetAtTime approaches the l imiting value well 55 // A really short time constant so that setTargetAtTime approaches the
53 // before the end of the test. 56 // limiting value well before the end of the test.
54 var timeConstant = 0.001; 57 let timeConstant = 0.001;
55 58
56 // Find the time where setTargetAtTime is close enough to the limit. Si nce we're 59 // Find the time where setTargetAtTime is close enough to the limit.
57 // approaching 0, use a value of eps smaller than kSetTargetZeroThreshol d (1e-20) in 60 // Since we're approaching 0, use a value of eps smaller than
58 // AudioParamTimeline.cpp. This is to account for round-off in the actu al implementation 61 // kSetTargetZeroThreshold (1e-20) in AudioParamTimeline.cpp. This is
59 // (which uses a filter and not the formula.) 62 // to account for round-off in the actual implementation (which uses a
60 var limitThreshold = 1e-21; 63 // filter and not the formula.)
64 let limitThreshold = 1e-21;
61 65
62 runTest(should, { 66 runTest(should, {
63 sampleRate: sampleRate, 67 sampleRate: sampleRate,
64 v0: 1, 68 v0: 1,
65 v1: 0, 69 v1: 0,
66 timeConstant: timeConstant, 70 timeConstant: timeConstant,
67 eps: limitThreshold, 71 eps: limitThreshold,
68 // Experimentally determined 72 // Experimentally determined
69 threshold: 1.3e-7 73 threshold: 1.3e-7
70 }).then(() => task.done()); 74 }).then(() => task.done());
71 }); 75 });
72 76
73 function findLimitTime(v0, v1, timeConstant, eps) { 77 function findLimitTime(v0, v1, timeConstant, eps) {
74 // Find the time at which the setTargetAtTime is close enough to the tar get value |v1| where 78 // Find the time at which the setTargetAtTime is close enough to the
75 // we can consider the curve to have reached its limiting value. 79 // target value |v1| where we can consider the curve to have reached its
80 // limiting value.
76 // 81 //
77 // If v1 = 0, |eps| is the absolute error between the actual value and 82 // If v1 = 0, |eps| is the absolute error between the actual value and
78 // |v1|. Otherwise, |eps| is the relative error between the actual valu e and |v1|. 83 // |v1|. Otherwise, |eps| is the relative error between the actual
84 // value and |v1|.
79 // 85 //
80 // The curve is 86 // The curve is
81 // 87 //
82 // v(t) = v1 - (v1 - v0) * exp(-t/timeConstant) 88 // v(t) = v1 - (v1 - v0) * exp(-t/timeConstant)
83 // 89 //
84 // If v1 = 0, 90 // If v1 = 0,
85 // 91 //
86 // v(t) = v0 * exp(-t/timeConstant) 92 // v(t) = v0 * exp(-t/timeConstant)
87 // 93 //
88 // Solve this for when |v(t)| <= eps: 94 // Solve this for when |v(t)| <= eps:
89 // 95 //
90 // t >= timeConstant * log(v0/eps) 96 // t >= timeConstant * log(v0/eps)
91 // 97 //
92 // For v1 not zero, we want |v(t) - v1|/|v1| <= eps: 98 // For v1 not zero, we want |v(t) - v1|/|v1| <= eps:
93 // 99 //
94 // t >= timeConstant * log(abs(v1-v0)/eps/v1) 100 // t >= timeConstant * log(abs(v1-v0)/eps/v1)
95 101
96 if (v1) 102 if (v1)
97 return timeConstant * Math.log(Math.abs(v1-v0)/eps/v1); 103 return timeConstant * Math.log(Math.abs(v1 - v0) / eps / v1);
98 else 104 else
99 return timeConstant * Math.log(v0/eps); 105 return timeConstant * Math.log(v0 / eps);
100 } 106 }
101 107
102 function runTest(should, options) { 108 function runTest(should, options) {
103 var renderLength = 1; 109 let renderLength = 1;
104 110
105 var context = new OfflineAudioContext(1, renderLength * sampleRate, opti ons.sampleRate); 111 let context = new OfflineAudioContext(
112 1, renderLength * sampleRate, options.sampleRate);
106 113
107 // A constant source 114 // A constant source
108 var source = context.createBufferSource(); 115 let source = context.createBufferSource();
109 source.buffer = createConstantBuffer(context, 1, 1); 116 source.buffer = createConstantBuffer(context, 1, 1);
110 source.loop = true; 117 source.loop = true;
111 118
112 var gain = context.createGain(); 119 let gain = context.createGain();
113 gain.gain.setValueAtTime(options.v0, 0); 120 gain.gain.setValueAtTime(options.v0, 0);
114 gain.gain.setTargetAtTime(options.v1, 0, options.timeConstant); 121 gain.gain.setTargetAtTime(options.v1, 0, options.timeConstant);
115 122
116 source.connect(gain); 123 source.connect(gain);
117 gain.connect(context.destination); 124 gain.connect(context.destination);
118 125
119 source.start(); 126 source.start();
120 127
121 return context.startRendering().then(function (resultBuffer) { 128 return context.startRendering().then(function(resultBuffer) {
122 var actual = resultBuffer.getChannelData(0); 129 let actual = resultBuffer.getChannelData(0);
123 var expected = createExponentialApproachArray(0, renderLength, 130 let expected = createExponentialApproachArray(
124 options.v0, options.v1, 131 0, renderLength, options.v0, options.v1, options.sampleRate,
125 options.sampleRate, options.timeConstant); 132 options.timeConstant);
126 133
127 var message = "setTargetAtTime(" + options.v1 + ", 0, " + options.time Constant + ")"; 134 let message = 'setTargetAtTime(' + options.v1 + ', 0, ' +
135 options.timeConstant + ')';
128 136
129 // Determine where the tail of the curve begins. (Where the curve has basically reached 137 // Determine where the tail of the curve begins. (Where the curve has
130 // the limit value.) 138 // basically reached the limit value.)
131 var tailTime = findLimitTime(options.v0, options.v1, options.timeConst ant, options.eps); 139 let tailTime = findLimitTime(
132 var tailFrame = Math.ceil(tailTime * options.sampleRate); 140 options.v0, options.v1, options.timeConstant, options.eps);
141 let tailFrame = Math.ceil(tailTime * options.sampleRate);
133 142
134 should(actual.slice(0, tailFrame), 143 should(
135 "Initial output of " + tailFrame + " samples for " + message) 144 actual.slice(0, tailFrame),
136 .beCloseToArray(expected.slice(0, tailFrame), { 145 'Initial output of ' + tailFrame + ' samples for ' + message)
137 absoluteThreshold: options.threshold 146 .beCloseToArray(
138 }); 147 expected.slice(0, tailFrame),
148 {absoluteThreshold: options.threshold});
139 149
140 should(actual.slice(tailFrame), "Tail output for " + message) 150 should(actual.slice(tailFrame), 'Tail output for ' + message)
141 .containValues([options.v1]); 151 .containValues([options.v1]);
142 }); 152 });
143 } 153 }
144 154
145 audit.run(); 155 audit.run();
146 </script> 156 </script>
147 </body> 157 </body>
148 </html> 158 </html>
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