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Use MediaElementAudioSourceNode #2

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Use MediaElementAudioSourceNode #2

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49 changes: 23 additions & 26 deletions src/utils/index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -9,7 +9,6 @@ const MIMETYPE_LIST = [
export const playAudio = ({ audioFile, bgColor, waveColor, src, setSrc, setWebmVideo }) => {
const audioContext = new (window.AudioContext || window.webkitAudioContext)()
const destination = audioContext.createMediaStreamDestination()
const fileReader = new FileReader()
const chunks = []
let animationId

Expand All @@ -32,34 +31,32 @@ export const playAudio = ({ audioFile, bgColor, waveColor, src, setSrc, setWebmV
const mediaRecorder = new MediaRecorder(mediaStream, { mimeType })
mediaRecorder.addEventListener('dataavailable', (e) => chunks.push(e.data))

fileReader.onload = () => {
audioContext.decodeAudioData(fileReader.result, (buffer) => {
if (src) {
src.stop()
cancelAnimationFrame(animationId)
}
const blob = URL.createObjectURL(audioFile)
const audioElement = new Audio(blob)
const source = audioContext.createMediaElementSource(audioElement)

const tempSrc = audioContext.createBufferSource()
setSrc(tempSrc)
audioElement.playbackRate = 1;

tempSrc.buffer = buffer
tempSrc.connect(analyser)
tempSrc.connect(destination)
audioElement.onloadstart = () => {
source.connect(analyser)
source.connect(destination)

mediaRecorder.start(100)
tempSrc.start(0)

animationId = requestAnimationFrame(render)
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@Korilakkuma Korilakkuma Jun 21, 2020

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I think that requestAnimationFrame is not needed (Because of 60fps delay ...). Therefore, animation starts by invoking render.


tempSrc.onended = () => setTimeout(() => {
mediaRecorder.stop()
const video = new Blob(chunks, { type: mimeType })
console.log(video)
setWebmVideo(video)
}, 100)
})
}
fileReader.readAsArrayBuffer(audioFile)
if (audioElement.paused) {
mediaRecorder.start(0)
audioElement.play()
render();
} else {
audioElement.pause()
cancelAnimationFrame(animationId)
}
};

audioElement.onended = () => {
mediaRecorder.stop()
const video = new Blob(chunks, { type: mimeType })
console.log(video)
setWebmVideo(video)
};

const render = () => {
const spectrums = new Uint8Array(analyser.frequencyBinCount)
Expand Down