Created
October 19, 2016 15:13
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Recording in the Browser
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var audioContext = new (window.AudioContext || window.webkitAudioContext)(); | |
navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.msGetUserMedia; | |
// Using arrow functions from ES 6 | |
navigator.getUserMedia({ audio: true }, (stream) => { | |
// API works in a pipe mechanism | |
const gain = audioContext.createGain(); | |
const audioSource = audioContext.createMediaStreamSource(stream); | |
// we connect the gain pipe to the audio source pipe. | |
var gainNode = audioSource.connect(gain); | |
const bufferSize = 2048; | |
const recorder = audioContext.createScriptProcessor(bufferSize, 2, 2); | |
// Script processor allows a function to execute once a certain buffer range is captured from the API. | |
// This is another pipe | |
recorder.onaudioprocess = (event) => { | |
for(let i = 0; i < 2; i++) { | |
// Typed array is used to hold the ArrayBuffer that is returned. | |
const channel = new Float32Array(event.inputBuffer.getChannelData(i)); | |
this.buffers[i].push(channel); | |
} | |
this.bufferLength += bufferSize; | |
}; | |
// We connect the gain pipe to the recorder as well | |
gain.connect(recorder); | |
// Recorder pipe is then connected to the audioContext. Audio Context will then push the bytes to the recorder pipe. | |
recorder.connect(audioContext.destination); | |
this.recordingStream = stream; | |
}, (err) => { | |
console.error(err); | |
}); |
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