Feature/audio detection #201
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,120 @@ | ||
| import { useCallback, useEffect, useRef, useState } from 'react'; | ||
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| const THRESHOLD = 60; | ||
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Owner
There was a problem hiding this comment. Please make |
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| const SILENCE_CENTER = 128; | ||
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| interface UseAudioOptions { | ||
| onDetect?: () => void; | ||
| threshold?: number; | ||
| } | ||
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| export const useAudio = (options?: UseAudioOptions) => { | ||
| const [isDetected, setIsDetected] = useState(false); | ||
| const [isListening, setIsListening] = useState(false); | ||
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| const audioContextRef = useRef<AudioContext | null>(null); | ||
| const analyserRef = useRef<AnalyserNode | null>(null); | ||
| const sourceRef = useRef<MediaStreamAudioSourceNode | null>(null); | ||
| const streamRef = useRef<MediaStream | null>(null); | ||
| const requestRef = useRef<number | null>(null); | ||
| const dataArrayRef = useRef<Uint8Array | null>(null); | ||
| const detectedRef = useRef(false); | ||
| const startingRef = useRef(false); | ||
| const onDetectRef = useRef<UseAudioOptions['onDetect']>(options?.onDetect); | ||
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| useEffect(() => { | ||
| onDetectRef.current = options?.onDetect; | ||
| }, [options?.onDetect]); | ||
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| function calculateMaxDeviation(dataArray: Uint8Array) { | ||
| let maxDeviation = 0; | ||
| for (let i = 0; i < dataArray.length; i++) { | ||
| const deviation = Math.abs(dataArray[i] - SILENCE_CENTER); | ||
| if (deviation > maxDeviation) { | ||
| maxDeviation = deviation; | ||
| } | ||
| } | ||
| return maxDeviation; | ||
| } | ||
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| const analyzeSound = useCallback(() => { | ||
| const analyser = analyserRef.current; | ||
| if (!analyser) return; | ||
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| const dataArray = dataArrayRef.current!; | ||
| analyser.getByteTimeDomainData(dataArray); | ||
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| const maxDeviation = calculateMaxDeviation(dataArray); | ||
| const threshold = options?.threshold ?? THRESHOLD; | ||
| if (maxDeviation > threshold && !detectedRef.current) { | ||
| detectedRef.current = true; | ||
| setIsDetected(true); | ||
| onDetectRef.current?.(); | ||
| return; | ||
| } | ||
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| if (!analyserRef.current) return; | ||
| requestRef.current = requestAnimationFrame(analyzeSound); | ||
| }, [options?.threshold]); | ||
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| const stopListening = useCallback(() => { | ||
| if (requestRef.current !== null) { | ||
| cancelAnimationFrame(requestRef.current); | ||
| requestRef.current = null; | ||
| } | ||
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| sourceRef.current?.disconnect(); | ||
| sourceRef.current = null; | ||
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| analyserRef.current?.disconnect(); | ||
| analyserRef.current = null; | ||
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| streamRef.current?.getTracks().forEach((track) => track.stop()); | ||
| streamRef.current = null; | ||
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| if (audioContextRef.current) { | ||
| void audioContextRef.current.close(); | ||
| audioContextRef.current = null; | ||
| } | ||
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| dataArrayRef.current = null; | ||
| detectedRef.current = false; | ||
| setIsListening(false); | ||
| }, []); | ||
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| const startListening = async () => { | ||
| if (isListening || startingRef.current) return; | ||
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| if (!navigator.mediaDevices?.getUserMedia) { | ||
| throw new Error('Microphone access requires a secure context (HTTPS or localhost).'); | ||
| } | ||
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| startingRef.current = true; | ||
| try { | ||
| const stream = await navigator.mediaDevices.getUserMedia({ audio: true }); | ||
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| const audioContext = new window.AudioContext(); | ||
| const analyser = audioContext.createAnalyser(); | ||
| const source = audioContext.createMediaStreamSource(stream); | ||
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| source.connect(analyser); | ||
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| audioContextRef.current = audioContext; | ||
| analyserRef.current = analyser; | ||
| sourceRef.current = source; | ||
| streamRef.current = stream; | ||
| dataArrayRef.current = new Uint8Array(analyser.fftSize); | ||
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| detectedRef.current = false; | ||
| setIsListening(true); | ||
| setIsDetected(false); | ||
| analyzeSound(); | ||
| } finally { | ||
| startingRef.current = false; | ||
| } | ||
| }; | ||
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| useEffect(() => stopListening, [stopListening]); | ||
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| return { isListening, isDetected, startListening, stopListening }; | ||
| }; | ||
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