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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 Sampling of Oscillator Start Times</title> 4 <title>
5 Test Sampling of Oscillator Start Times
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 </head> 11 </head>
10
11 <body> 12 <body>
12 <script> 13 <script id="layout-test-code">
13 // Experimentation indicates that this sample rate with a 440 Hz 14 // Experimentation indicates that this sample rate with a 440 Hz
14 // oscillator makes for a large difference in the difference signal if the 15 // oscillator makes for a large difference in the difference signal if the
15 // oscillator start isn't sampled correctly. 16 // oscillator start isn't sampled correctly.
16 let defaultSampleRate = 24000; 17 let defaultSampleRate = 24000;
17 let renderDuration = 1; 18 let renderDuration = 1;
18 let renderFrames = renderDuration * defaultSampleRate; 19 let renderFrames = renderDuration * defaultSampleRate;
19 20
20 let audit = Audit.createTaskRunner(); 21 let audit = Audit.createTaskRunner();
21 22
22 audit.define( 23 audit.define(
23 { 24 {
24 label: 'basic test small', 25 label: 'basic test small',
25 description: 'Start oscillator slightly past a sample frame' 26 description: 'Start oscillator slightly past a sample frame'
26 }, 27 },
27 function(task, should) { 28 function(task, should) {
28 testStartSampling(should, 1.25, { 29 testStartSampling(should, 1.25, {
29 error: 1.0842e-4, 30 error: 1.0842e-4,
(...skipping 45 matching lines...) Expand 10 before | Expand all | Expand 10 after
75 // the internal implementation. 76 // the internal implementation.
76 testStartWithGain(should, 48000, { 77 testStartWithGain(should, 48000, {
77 error: 4.1724e-7, 78 error: 4.1724e-7,
78 snrThreshold: 137.536 79 snrThreshold: 137.536
79 }).then(task.done.bind(task)); 80 }).then(task.done.bind(task));
80 }); 81 });
81 82
82 function testStartSampling(should, startFrame, thresholds) { 83 function testStartSampling(should, startFrame, thresholds) {
83 // Start the oscillator in the middle of a sample frame and compare 84 // Start the oscillator in the middle of a sample frame and compare
84 // against the theoretical result. 85 // against the theoretical result.
85 let context = new OfflineAudioContext(1, renderFrames, 86 let context =
86 defaultSampleRate); 87 new OfflineAudioContext(1, renderFrames, defaultSampleRate);
87 let osc = context.createOscillator(); 88 let osc = context.createOscillator();
88 osc.connect(context.destination); 89 osc.connect(context.destination);
89 osc.start(startFrame / context.sampleRate); 90 osc.start(startFrame / context.sampleRate);
90 91
91 return context.startRendering().then(function (result) { 92 return context.startRendering().then(function(result) {
92 let actual = result.getChannelData(0); 93 let actual = result.getChannelData(0);
93 let expected = new Array(actual.length); 94 let expected = new Array(actual.length);
94 expected.fill(0); 95 expected.fill(0);
95 96
96 // The expected curve is 97 // The expected curve is
97 // 98 //
98 // sin(2*pi*f*(t-t0)) 99 // sin(2*pi*f*(t-t0))
99 // 100 //
100 // where f is the oscillator frequency and t0 is the start time. 101 // where f is the oscillator frequency and t0 is the start time.
101 let actualStart = Math.ceil(startFrame); 102 let actualStart = Math.ceil(startFrame);
102 let omega = 2 * Math.PI * osc.frequency.value / context.sampleRate; 103 let omega = 2 * Math.PI * osc.frequency.value / context.sampleRate;
103 for (let k = actualStart; k < actual.length; ++k) { 104 for (let k = actualStart; k < actual.length; ++k) {
104 expected[k] = Math.sin(omega * (k - startFrame)); 105 expected[k] = Math.sin(omega * (k - startFrame));
105 } 106 }
106 107
107 let prefix = "Oscillator.start(" + startFrame + " frames)"; 108 let prefix = 'Oscillator.start(' + startFrame + ' frames)';
108 should(actual, prefix) 109 should(actual, prefix).beCloseToArray(expected, {
109 .beCloseToArray(expected, { 110 absoluteThreshold: thresholds.error
110 absoluteThreshold: thresholds.error 111 });
111 });
112 let snr = 10 * Math.log10(computeSNR(actual, expected)); 112 let snr = 10 * Math.log10(computeSNR(actual, expected));
113 should(snr, prefix + ": SNR (dB)") 113 should(snr, prefix + ': SNR (dB)')
114 .beGreaterThanOrEqualTo(thresholds.snrThreshold); 114 .beGreaterThanOrEqualTo(thresholds.snrThreshold);
115 }) 115 })
116 } 116 }
117 117
118 function testStartWithGain(should, sampleRate, thresholds) { 118 function testStartWithGain(should, sampleRate, thresholds) {
119 // Test consists of starting a cosine wave with a quarter wavelength 119 // Test consists of starting a cosine wave with a quarter wavelength
120 // delay and comparing that with a sine wave that has the initial 120 // delay and comparing that with a sine wave that has the initial
121 // quarter wavelength zeroed out. These should be equal. 121 // quarter wavelength zeroed out. These should be equal.
122 122
123 let context = new OfflineAudioContext(3, renderFrames, sampleRate); 123 let context = new OfflineAudioContext(3, renderFrames, sampleRate);
124 let osc = context.createOscillator(); 124 let osc = context.createOscillator();
(...skipping 11 matching lines...) Expand all
136 g.gain.setValueAtTime(0, 0); 136 g.gain.setValueAtTime(0, 0);
137 g.gain.setValueAtTime(1, quarterWaveTime); 137 g.gain.setValueAtTime(1, quarterWaveTime);
138 osc.connect(g); 138 osc.connect(g);
139 g.connect(merger, 0, 2); 139 g.connect(merger, 0, 2);
140 g.connect(merger, 0, 0); 140 g.connect(merger, 0, 0);
141 141
142 // Cosine wave oscillator with starting after a quarter wave length. 142 // Cosine wave oscillator with starting after a quarter wave length.
143 let osc2 = context.createOscillator(); 143 let osc2 = context.createOscillator();
144 // Creates a cosine wave. 144 // Creates a cosine wave.
145 let wave = context.createPeriodicWave( 145 let wave = context.createPeriodicWave(
146 Float32Array.from([0, 1]), 146 Float32Array.from([0, 1]), Float32Array.from([0, 0]));
147 Float32Array.from([0, 0]));
148 osc2.setPeriodicWave(wave); 147 osc2.setPeriodicWave(wave);
149 148
150 osc2.connect(merger, 0, 1); 149 osc2.connect(merger, 0, 1);
151 150
152 // A gain inverter so subtract the two waveforms. 151 // A gain inverter so subtract the two waveforms.
153 let inverter = context.createGain(); 152 let inverter = context.createGain();
154 inverter.gain.value = -1; 153 inverter.gain.value = -1;
155 osc2.connect(inverter); 154 osc2.connect(inverter);
156 inverter.connect(merger, 0, 0); 155 inverter.connect(merger, 0, 0);
157 156
158 osc.start(); 157 osc.start();
159 osc2.start(quarterWaveTime); 158 osc2.start(quarterWaveTime);
160 159
161 return context.startRendering().then(function (result) { 160 return context.startRendering().then(function(result) {
162 // Channel 0 = diff 161 // Channel 0 = diff
163 // Channel 1 = osc with start 162 // Channel 1 = osc with start
164 // Channel 2 = osc with gain 163 // Channel 2 = osc with gain
165 164
166 // Channel 0 should be very close to 0. 165 // Channel 0 should be very close to 0.
167 // Channel 1 should match channel 2 very closely. 166 // Channel 1 should match channel 2 very closely.
168 let diff = result.getChannelData(0); 167 let diff = result.getChannelData(0);
169 let oscStart = result.getChannelData(1); 168 let oscStart = result.getChannelData(1);
170 let oscGain = result.getChannelData(2); 169 let oscGain = result.getChannelData(2);
171 let snr = 10 * Math.log10(computeSNR(oscStart, oscGain)); 170 let snr = 10 * Math.log10(computeSNR(oscStart, oscGain));
172 171
173 let prefix = "Sample rate " + sampleRate + ": Delayed cosine oscillato r"; 172 let prefix =
174 should(oscStart, prefix) 173 'Sample rate ' + sampleRate + ': Delayed cosine oscillator';
175 .beCloseToArray(oscGain, { 174 should(oscStart, prefix).beCloseToArray(oscGain, {
176 absoluteThreshold: thresholds.error 175 absoluteThreshold: thresholds.error
177 }); 176 });
178 should(snr, prefix + ": SNR (dB)") 177 should(snr, prefix + ': SNR (dB)')
179 .beGreaterThanOrEqualTo(thresholds.snrThreshold); 178 .beGreaterThanOrEqualTo(thresholds.snrThreshold);
180 }); 179 });
181 } 180 }
182 181
183 audit.run(); 182 audit.run();
184 </script> 183 </script>
185 </body> 184 </body>
186 </html> 185 </html>
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