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Side by Side Diff: third_party/WebKit/LayoutTests/webaudio/resources/audio-param.js

Issue 2895963003: Apply layout-test-tidy to LayoutTests/webaudio (Closed)
Patch Set: Created 3 years, 7 months ago
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1 // Define functions that implement the formulas for AudioParam automations. 1 // Define functions that implement the formulas for AudioParam automations.
2 2
3 // AudioParam linearRamp value at time t for a linear ramp between (t0, v0) and (t1, v1). It is 3 // AudioParam linearRamp value at time t for a linear ramp between (t0, v0) and
4 // assumed that t0 <= t. Results are undefined otherwise. 4 // (t1, v1). It is assumed that t0 <= t. Results are undefined otherwise.
5 function audioParamLinearRamp(t, v0, t0, v1, t1) 5 function audioParamLinearRamp(t, v0, t0, v1, t1) {
6 { 6 if (t >= t1)
7 if (t >= t1) 7 return v1;
8 return v1; 8 return (v0 + (v1 - v0) * (t - t0) / (t1 - t0))
9 return (v0 + (v1 - v0) * (t - t0) / (t1 - t0))
10 } 9 }
11 10
12 // AudioParam exponentialRamp value at time t for an exponential ramp between (t 0, v0) and (t1, v1). 11 // AudioParam exponentialRamp value at time t for an exponential ramp between
13 // It is assumed that t0 <= t. Results are undefined otherwise. 12 // (t0, v0) and (t1, v1). It is assumed that t0 <= t. Results are undefined
14 function audioParamExponentialRamp(t, v0, t0, v1, t1) 13 // otherwise.
15 { 14 function audioParamExponentialRamp(t, v0, t0, v1, t1) {
16 if (t >= t1) 15 if (t >= t1)
17 return v1; 16 return v1;
18 return v0 * Math.pow(v1 / v0, (t - t0) / (t1 - t0)); 17 return v0 * Math.pow(v1 / v0, (t - t0) / (t1 - t0));
19 } 18 }
20 19
21 // AudioParam setTarget value at time t for a setTarget curve starting at (t0, v 0) with a final 20 // AudioParam setTarget value at time t for a setTarget curve starting at (t0,
22 // value of vFainal and a time constant of timeConstant. It is assumed that t0 <= t. Results are 21 // v0) with a final value of vFainal and a time constant of timeConstant. It is
23 // undefined otherwise. 22 // assumed that t0 <= t. Results are undefined otherwise.
24 function audioParamSetTarget(t, v0, t0, vFinal, timeConstant) 23 function audioParamSetTarget(t, v0, t0, vFinal, timeConstant) {
25 { 24 return vFinal + (v0 - vFinal) * Math.exp(-(t - t0) / timeConstant);
26 return vFinal + (v0 - vFinal) * Math.exp(-(t - t0) / timeConstant);
27 } 25 }
28 26
29 // AudioParam setValueCurve value at time t for a setValueCurve starting at time t0 with curve, 27 // AudioParam setValueCurve value at time t for a setValueCurve starting at time
30 // curve, and duration duration. The sample rate is sampleRate. It is assumed that t0 <= t. 28 // t0 with curve, curve, and duration duration. The sample rate is sampleRate.
31 function audioParamSetValueCurve(t, curve, t0, duration) 29 // It is assumed that t0 <= t.
32 { 30 function audioParamSetValueCurve(t, curve, t0, duration) {
33 if (t > t0 + duration) 31 if (t > t0 + duration)
34 return curve[curve.length - 1]; 32 return curve[curve.length - 1];
35 33
36 var curvePointsPerSecond = (curve.length - 1) / duration; 34 let curvePointsPerSecond = (curve.length - 1) / duration;
37 35
38 var virtualIndex = (t - t0) * curvePointsPerSecond; 36 let virtualIndex = (t - t0) * curvePointsPerSecond;
39 var index = Math.floor(virtualIndex); 37 let index = Math.floor(virtualIndex);
40 38
41 var delta = virtualIndex - index; 39 let delta = virtualIndex - index;
42 40
43 var c0 = curve[index]; 41 let c0 = curve[index];
44 var c1 = curve[Math.min(index + 1, curve.length - 1)]; 42 let c1 = curve[Math.min(index + 1, curve.length - 1)];
45 return c0 + (c1 - c0) * delta; 43 return c0 + (c1 - c0) * delta;
46 } 44 }
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