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180 lines
4.6 KiB
JavaScript

// set up basic variables for app
const record = document.querySelector('.record');
const stop = document.querySelector('.stop');
const soundClips = document.querySelector('.sound-clips');
const canvas = document.querySelector('.visualizer');
const mainSection = document.querySelector('.main-controls');
// disable stop button while not recording
stop.disabled = true;
// visualiser setup - create web audio api context and canvas
let audioCtx;
const canvasCtx = canvas.getContext("2d");
//main block for doing the audio recording
if (navigator.mediaDevices.getUserMedia) {
console.log('getUserMedia supported.');
const constraints = { audio: true };
let chunks = [];
let onSuccess = function(stream) {
const mediaRecorder = new MediaRecorder(stream);
visualize(stream);
record.onclick = function() {
mediaRecorder.start();
console.log(mediaRecorder.state);
console.log("recorder started");
record.style.background = "red";
stop.disabled = false;
record.disabled = true;
}
stop.onclick = function() {
mediaRecorder.stop();
console.log(mediaRecorder.state);
console.log("recorder stopped");
record.style.background = "";
record.style.color = "";
// mediaRecorder.requestData();
stop.disabled = true;
record.disabled = false;
}
mediaRecorder.onstop = function(e) {
console.log("data available after MediaRecorder.stop() called.");
const clipName = prompt('Enter a name for your sound clip?','My unnamed clip');
const clipContainer = document.createElement('article');
const clipLabel = document.createElement('p');
const audio = document.createElement('audio');
const deleteButton = document.createElement('button');
clipContainer.classList.add('clip');
audio.setAttribute('controls', '');
deleteButton.textContent = 'Delete';
deleteButton.className = 'delete';
if(clipName === null) {
clipLabel.textContent = 'My unnamed clip';
} else {
clipLabel.textContent = clipName;
}
clipContainer.appendChild(audio);
clipContainer.appendChild(clipLabel);
clipContainer.appendChild(deleteButton);
soundClips.appendChild(clipContainer);
audio.controls = true;
const blob = new Blob(chunks, { 'type' : 'audio/ogg; codecs=opus' });
chunks = [];
const audioURL = window.URL.createObjectURL(blob);
audio.src = audioURL;
console.log("recorder stopped");
deleteButton.onclick = function(e) {
let evtTgt = e.target;
evtTgt.parentNode.parentNode.removeChild(evtTgt.parentNode);
}
clipLabel.onclick = function() {
const existingName = clipLabel.textContent;
const newClipName = prompt('Enter a new name for your sound clip?');
if(newClipName === null) {
clipLabel.textContent = existingName;
} else {
clipLabel.textContent = newClipName;
}
}
}
mediaRecorder.ondataavailable = function(e) {
// console.log("dataavailable", e);
chunks.push(e.data);
}
}
let onError = function(err) {
console.log('The following error occured: ' + err);
}
navigator.mediaDevices.getUserMedia(constraints).then(onSuccess, onError);
} else {
console.log('getUserMedia not supported on your browser!');
}
function visualize(stream) {
if(!audioCtx) {
audioCtx = new AudioContext();
}
const source = audioCtx.createMediaStreamSource(stream);
const analyser = audioCtx.createAnalyser();
analyser.fftSize = 2048;
const bufferLength = analyser.frequencyBinCount;
const dataArray = new Uint8Array(bufferLength);
source.connect(analyser);
//analyser.connect(audioCtx.destination);
draw()
function draw() {
const WIDTH = canvas.width
const HEIGHT = canvas.height;
requestAnimationFrame(draw);
analyser.getByteTimeDomainData(dataArray);
canvasCtx.fillStyle = 'rgb(200, 200, 200)';
canvasCtx.fillRect(0, 0, WIDTH, HEIGHT);
canvasCtx.lineWidth = 2;
canvasCtx.strokeStyle = 'rgb(0, 0, 0)';
canvasCtx.beginPath();
let sliceWidth = WIDTH * 1.0 / bufferLength;
let x = 0;
for(let i = 0; i < bufferLength; i++) {
let v = dataArray[i] / 128.0;
let y = v * HEIGHT/2;
if(i === 0) {
canvasCtx.moveTo(x, y);
} else {
canvasCtx.lineTo(x, y);
}
x += sliceWidth;
}
canvasCtx.lineTo(canvas.width, canvas.height/2);
canvasCtx.stroke();
}
}
window.onresize = function() {
canvas.width = mainSection.offsetWidth;
}
window.onresize();