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Issue 2597723002: Convert audiobuffer-resample to testharness (Closed)
Patch Set: Address review comments. Created 3 years, 11 months ago
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1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 1 <!doctype>
2 <html> 2 <html>
3 <head> 3 <head>
4 <script src="../../resources/js-test.js"></script> 4 <script src="../../resources/testharness.js"></script>
5 <script src="../../resources/testharnessreport.js"></script>
5 <script src="../resources/audit-util.js"></script> 6 <script src="../resources/audit-util.js"></script>
6 <script src="../resources/audio-testing.js"></script> 7 <script src="../resources/audit.js"></script>
7 </head> 8 </head>
8 9
9 <body> 10 <body>
10 <div id="description"></div> 11 <script>
11 <div id="console"></div> 12 let audit = Audit.createTaskRunner();
12 13
13 <script>
14 // These are global to make debugging a little easier. 14 // These are global to make debugging a little easier.
15 var context; 15 let context;
16 var buffer; 16 let buffer;
17 var source; 17 let source;
18 var renderedData; 18 let renderedData;
19 var trueData; 19 let trueData;
20 var signalEnergy; 20 let signalEnergy;
21 var noiseEnergy; 21 let noiseEnergy;
22 var maxError; 22 let maxError;
23 23
24 // Context sample rate. 24 // Context sample rate.
25 var sampleRate = 48000; 25 let sampleRate = 48000;
26 // The sample rate of the buffer. 26 // The sample rate of the buffer.
27 var bufferRate = 3000; 27 let bufferRate = 3000;
28 // The audio buffer is a sine wave of this frequency. 28 // The audio buffer is a sine wave of this frequency.
29 var toneFrequency = 440; 29 let toneFrequency = 440;
30 // How long test is 30 // How long test is
31 var lengthInSeconds = 0.5; 31 let lengthInSeconds = 0.5;
32 // The maximum allowed peak error between the actual and true output. This value was 32 // The maximum allowed peak error between the actual and true output. This
33 // experimentally determined for the given bufferRate. 33 // value was experimentally determined for the given bufferRate.
34 var peakThreshold = 0.11; 34 let peakThreshold = 0.11;
35 // The minimum SNR allowed between the actual and true output. 35 // The minimum SNR allowed between the actual and true output.
36 var snrThreshold = 22.35; 36 let snrThreshold = 22.35;
37 37
38 description("Test resampling of an AudioBuffer at " + bufferRate + " Hz");
39 38
40 function log10(x) { 39 // Generate a sine wave in an AudioBuffer using the given |freq|. The
41 return Math.log(x)/Math.LN10; 40 // AudioBuffer has the sample rate of |rate|.
42 }
43
44 // Generate a sine wave in an AudioBuffer using the given |freq|. The Audi oBuffer has the
45 // sample rate of |rate|.
46 function createSineBuffer(context, freq, rate) { 41 function createSineBuffer(context, freq, rate) {
47 var buf = context.createBuffer(1, lengthInSeconds * rate, rate); 42 let buf = context.createBuffer(1, lengthInSeconds * rate, rate);
48 var omega = 2 * Math.PI * freq / rate; 43 let omega = 2 * Math.PI * freq / rate;
49 var signal = buf.getChannelData(0); 44 let signal = buf.getChannelData(0);
50 var length = signal.length; 45 let length = signal.length;
51 for (var k = 0; k < length; ++k) 46 for (let k = 0; k < length; ++k)
52 signal[k] = Math.sin(omega * k); 47 signal[k] = Math.sin(omega * k);
53 48
54 return buf; 49 return buf;
55 } 50 }
56 51
57 // Check the output against the expected output. 52 // Check the output against the expected output.
58 function checkResult(event) { 53 function checkResult(buffer, should) {
59 renderedData = event.renderedBuffer.getChannelData(0); 54 renderedData = buffer.getChannelData(0);
60 var length = renderedData.length; 55 let length = renderedData.length;
61 // Generate a reference sine wave at the context rate 56 // Generate a reference sine wave at the context rate
62 var trueReference = createSineBuffer(context, toneFrequency, context.s ampleRate); 57 let trueReference = createSineBuffer(context, toneFrequency, context.sam pleRate);
63 trueData = trueReference.getChannelData(0); 58 trueData = trueReference.getChannelData(0);
64 59
65 // To compare the actual output against the reference, we compute the peak error and the 60 // To compare the actual output against the reference, we compute the
66 // SNR between the two. 61 // peak error and the SNR between the two.
67 signalEnergy = 0; 62 signalEnergy = 0;
68 noiseEnergy = 0; 63 noiseEnergy = 0;
69 maxError = -1; 64 maxError = -1;
70 65
71 var success = true; 66 let success = true;
72 67
73 // Compute the peak error and the SNR. 68 // Compute the peak error and the SNR.
74 for (var k = 0; k < length / 2; ++k) { 69 for (let k = 0; k < length / 2; ++k) {
75 var diff = renderedData[k] - trueData[k]; 70 let diff = renderedData[k] - trueData[k];
76 noiseEnergy += diff * diff; 71 noiseEnergy += diff * diff;
77 signalEnergy += trueData[k] * trueData[k]; 72 signalEnergy += trueData[k] * trueData[k];
78 if (Math.abs(diff) > maxError) 73 if (Math.abs(diff) > maxError)
79 maxError = Math.abs(diff); 74 maxError = Math.abs(diff);
80 } 75 }
81 76
82 var snr; 77 let snr;
83 78
84 if (noiseEnergy == 0) 79 if (noiseEnergy == 0)
85 snr = 1000; 80 snr = 1000;
86 else 81 else
87 snr = 10 * log10(signalEnergy / noiseEnergy); 82 snr = 10 * Math.log10(signalEnergy / noiseEnergy);
88
89 if (maxError < peakThreshold) {
90 testPassed("Peak error between actual and reference data below thr eshold of " +
91 peakThreshold + ".");
92 } else {
93 testFailed("Peak error of " + maxError + " exceeds threshold of " +
94 peakThreshold + ".");
95 success = false;
96 }
97 83
98 if (snr > snrThreshold) { 84 should(maxError, "Peak error between actual and reference data")
99 testPassed("SNR exceeds threshold of " + snrThreshold + " dB."); 85 .beLessThan(peakThreshold);
100 } else {
101 testFailed("SNR of " + snr + " is below the threshold of " + snrTh reshold + ".");
102 success = false;
103 }
104
105 if (success)
106 testPassed("AudioBuffer resampling is accurate for buffer rate of " +
107 bufferRate + " Hz.");
108 else
109 testFailed("AudioBuffer resampling is not accurate enough for buff er rate of " +
110 bufferRate + " Hz.");
111 86
112 finishJSTest(); 87 should(snr, "SNR")
88 .beGreaterThan(snrThreshold);
113 } 89 }
114 90
115 function runTest() { 91 audit.define("Test resampling of an AudioBuffer",
116 if (window.testRunner) { 92 function(task, should) {
117 testRunner.dumpAsText(); 93 context = new OfflineAudioContext(1, lengthInSeconds *
118 testRunner.waitUntilDone(); 94 sampleRate,
119 } 95 sampleRate);
120 96
121 window.jsTestIsAsync = true; 97 // Create a sine wave in a buffer that's different from the context ra te
122 98 // to test resampling.
123 context = new OfflineAudioContext(1, lengthInSeconds * sampleRate, sam pleRate);
124
125 // Create a sine wave in a buffer that's different from the context ra te to test
126 // resampling.
127 buffer = createSineBuffer(context, toneFrequency, bufferRate); 99 buffer = createSineBuffer(context, toneFrequency, bufferRate);
128 source = context.createBufferSource(); 100 source = context.createBufferSource();
129 source.buffer = buffer; 101 source.buffer = buffer;
130 source.connect(context.destination); 102 source.connect(context.destination);
131 source.start(); 103 source.start();
132 104
133 context.oncomplete = checkResult; 105 context.startRendering()
134 context.startRendering(); 106 .then(function(buffer) {
135 } 107 checkResult(buffer, should);
136 runTest(); 108 })
137 successfullyParsed = true; 109 .then(task.done.bind(task));
110 });
111
112 audit.run();
138 </script> 113 </script>
139 </body> 114 </body>
140 </html> 115 </html>
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