63 lines
1.8 KiB
TypeScript
63 lines
1.8 KiB
TypeScript
import type { Effect } from './Effect.interface'
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export class DelayEffect implements Effect {
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readonly id = 'delay'
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private inputNode: GainNode
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private outputNode: GainNode
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private delayNode: DelayNode
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private feedbackNode: GainNode
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private wetNode: GainNode
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private dryNode: GainNode
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constructor(audioContext: AudioContext) {
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this.inputNode = audioContext.createGain()
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this.outputNode = audioContext.createGain()
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this.delayNode = audioContext.createDelay(2.0)
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this.feedbackNode = audioContext.createGain()
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this.wetNode = audioContext.createGain()
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this.dryNode = audioContext.createGain()
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this.dryNode.gain.value = 1
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this.wetNode.gain.value = 0
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this.feedbackNode.gain.value = 0.5
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this.inputNode.connect(this.dryNode)
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this.inputNode.connect(this.delayNode)
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this.delayNode.connect(this.feedbackNode)
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this.feedbackNode.connect(this.delayNode)
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this.delayNode.connect(this.wetNode)
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this.dryNode.connect(this.outputNode)
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this.wetNode.connect(this.outputNode)
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}
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getInputNode(): AudioNode {
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return this.inputNode
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}
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getOutputNode(): AudioNode {
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return this.outputNode
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}
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updateParams(values: Record<string, number>): void {
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if (values.delayTime !== undefined) {
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this.delayNode.delayTime.value = values.delayTime / 1000
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const delayAmount = Math.min(values.delayTime / 1000, 0.5)
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this.wetNode.gain.value = delayAmount
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this.dryNode.gain.value = 1 - delayAmount
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}
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if (values.delayFeedback !== undefined) {
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this.feedbackNode.gain.value = values.delayFeedback / 100
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}
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}
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dispose(): void {
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this.inputNode.disconnect()
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this.outputNode.disconnect()
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this.delayNode.disconnect()
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this.feedbackNode.disconnect()
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this.wetNode.disconnect()
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this.dryNode.disconnect()
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}
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} |