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Merge pull request #702 from JackCA/oneshot-source-idle-callback

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OneShotSource requestIdleCallback optimization
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Yotam Mann 2020-07-21 15:10:20 -07:00 committed by GitHub
commit 655cd75b4e
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1 changed files with 38 additions and 11 deletions
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49
Tone/source/OneShotSource.ts
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@ -1,5 +1,8 @@
import { Gain } from "../core/context/Gain";
import { ToneAudioNode, ToneAudioNodeOptions } from "../core/context/ToneAudioNode";
import {
ToneAudioNode,
ToneAudioNodeOptions,
} from "../core/context/ToneAudioNode";
import { GainFactor, Seconds, Time } from "../core/type/Units";
import { noOp } from "../core/util/Interface";
import { assert } from "../core/util/Debug";
@ -19,8 +22,9 @@ export interface OneShotSourceOptions extends ToneAudioNodeOptions {
/**
* Base class for fire-and-forget nodes
*/
export abstract class OneShotSource<Options extends ToneAudioNodeOptions> extends ToneAudioNode<Options> {
export abstract class OneShotSource<
Options extends ToneAudioNodeOptions
> extends ToneAudioNode<Options> {
/**
* The callback to invoke after the
* source is done playing.
@ -108,7 +112,10 @@ export abstract class OneShotSource<Options extends ToneAudioNodeOptions> extend
* @param time When to start the source
*/
protected _startGain(time: Seconds, gain: GainFactor = 1): this {
assert(this._startTime === -1, "Source cannot be started more than once");
assert(
this._startTime === -1,
"Source cannot be started more than once"
);
// apply a fade in envelope
const fadeInTime = this.toSeconds(this._fadeIn);
@ -120,9 +127,16 @@ export abstract class OneShotSource<Options extends ToneAudioNodeOptions> extend
if (fadeInTime > 0) {
this._gainNode.gain.setValueAtTime(0, time);
if (this._curve === "linear") {
this._gainNode.gain.linearRampToValueAtTime(gain, time + fadeInTime);
this._gainNode.gain.linearRampToValueAtTime(
gain,
time + fadeInTime
);
} else {
this._gainNode.gain.exponentialApproachValueAtTime(gain, time, fadeInTime);
this._gainNode.gain.exponentialApproachValueAtTime(
gain,
time,
fadeInTime
);
}
} else {
this._gainNode.gain.setValueAtTime(gain, time);
@ -170,7 +184,8 @@ export abstract class OneShotSource<Options extends ToneAudioNodeOptions> extend
this.context.clearTimeout(this._timeout);
this._timeout = this.context.setTimeout(() => {
// allow additional time for the exponential curve to fully decay
const additionalTail = this._curve === "exponential" ? fadeOutTime * 2 : 0;
const additionalTail =
this._curve === "exponential" ? fadeOutTime * 2 : 0;
this._stopSource(this.now() + additionalTail);
this._onended();
}, this._stopTime - this.context.currentTime);
@ -187,7 +202,14 @@ export abstract class OneShotSource<Options extends ToneAudioNodeOptions> extend
this.onended = noOp;
// dispose when it's ended to free up for garbage collection only in the online context
if (!this.context.isOffline) {
setTimeout(() => this.dispose(), 1000);
const disposeCallback = () => this.dispose();
// @ts-ignore
if (typeof window.requestIdleCallback !== "undefined") {
// @ts-ignore
window.requestIdleCallback(disposeCallback);
} else {
setTimeout(disposeCallback, 1000);
}
}
}
}
@ -197,8 +219,11 @@ export abstract class OneShotSource<Options extends ToneAudioNodeOptions> extend
*/
getStateAtTime = function(time: Time): BasicPlaybackState {
const computedTime = this.toSeconds(time);
if (this._startTime !== -1 && computedTime >= this._startTime &&
(this._stopTime === -1 || computedTime <= this._stopTime)) {
if (
this._startTime !== -1 &&
computedTime >= this._startTime &&
(this._stopTime === -1 || computedTime <= this._stopTime)
) {
return "started";
} else {
return "stopped";
@ -219,7 +244,9 @@ export abstract class OneShotSource<Options extends ToneAudioNodeOptions> extend
this.log("cancelStop");
assert(this._startTime !== -1, "Source is not started");
// cancel the stop envelope
this._gainNode.gain.cancelScheduledValues(this._startTime + this.sampleTime);
this._gainNode.gain.cancelScheduledValues(
this._startTime + this.sampleTime
);
this.context.clearTimeout(this._timeout);
this._stopTime = -1;
return this;