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// creating an audio button
formTabs.innerHTML += `
<div class="form-upload-tab tab disabled" id="form-tab-audio">
<button onclick="showUploadType('audio')" class="transparent">
<p>Record</p>
</button>
</div>
`;
function generateAudioRecorderHTML() {
return `
<div class="column gap-8">
<button type="button" class="big-upload-button" onclick="startRecording()" id="record-start-btn">
<h1>Click here to start audio recording</h1>
</button>
<button type="button" class="big-upload-button" onclick="stopRecording()" id="record-stop-btn" style="display: none">
<h1>Recording...</h1>
<p>Click here to stop audio recording</p>
</button>
<div class="row align-center justify-center">
<div class="box row align-center gap-8 pad-8" id="record-player" style="display:none">
<button type="button" onclick="removeRecording()">
<img src="/static/img/icons/cross.png" alt="Delete">
</button>
<button type="button" onclick="startRecording()">
<img src="/static/img/icons/repeat.png" alt="Retry">
</button>
<button type="button" onclick="playRecord()" id="record-play-btn">
<img src="/static/img/icons/play.png" alt="Play">
</button>
<button type="button" onclick="pauseRecord()" id="record-pause-btn" style="display: none;">
<img src="/static/img/icons/pause.png" alt="Pause">
</button>
<div class="column gap-8">
<input type="range" min="0" max="100" value="0" step="0.01" class="audio-slider" id="record-slider" oninput="rewindRecord()">
<div class="row justify-between">
<p id="record-currentsecond"></p>
<p id="record-duration"></p>
</div>
</div>
</div>
</div>
</div>
`;
}
const form = document.getElementById('form-record-upload');
form.innerHTML = generateAudioRecorderHTML();
const startBtn = document.getElementById('record-start-btn');
const stopBtn = document.getElementById('record-stop-btn');
const playBtn = document.getElementById('record-play-btn');
const pauseBtn = document.getElementById('record-pause-btn');
const player = document.getElementById('record-player');
const slider = document.getElementById('record-slider');
const currentSecond = document.getElementById('record-currentsecond');
const duration = document.getElementById('record-duration');
let playback = null;
// record functions
let mediaRecorder;
let stream;
let audioChunks = [];
let audioLength = 0;
async function startRecording() {
// TODO: very poor sound quality
stream = await navigator.mediaDevices.getUserMedia({ audio: { sampleRate: 44100, channelCount: 1 }});
const options = { mimeType: 'audio/ogg; codecs=opus', audioBitsPerSecond: 128000 };
if (!MediaRecorder.isTypeSupported(options.mimeType)) {
alert("Your browser doesn't support audio/ogg recording.");
return;
}
audioLength = 0;
mediaRecorder = new MediaRecorder(stream, options);
audioChunks = [];
mediaRecorder.ondataavailable = event => {
if (event.data.size > 0) {
audioChunks.push(event.data);
audioLength++;
}
};
mediaRecorder.start();
startBtn.style.display = 'none';
stopBtn.style.display = 'block';
player.style.display = 'none';
setFormDetailsVisiblity(false);
}
function stopRecording() {
mediaRecorder.stop();
startBtn.style.display = 'block';
stopBtn.style.display = 'none';
if (playback) {
form.removeChild(playback);
playback = null;
}
mediaRecorder.onstop = () => {
const blob = new Blob(audioChunks, { type: 'audio/ogg; codecs=opus' });
const file = new File([blob], 'recording.ogg', { type: 'audio/ogg; codecs=opus' });
const url = URL.createObjectURL(file);
playback = document.createElement('audio');
playback.src = url;
playback.addEventListener('loadedmetadata', () => {
const d = playback.duration;
slider.max = d;
slider.value = 0;
currentSecond.textContent = formatTimestamp(slider.getAttribute('value'));
duration.textContent = formatTimestamp(d);
});
playback.addEventListener('timeupdate', () => {
currentSecond.textContent = formatTimestamp(playback.currentTime);
slider.value = playback.currentTime;
});
playback.addEventListener('ended', () => {
playBtn.style.display = 'flex';
pauseBtn.style.display = 'none';
currentSecond.textContent = formatTimestamp(0);
slider.value = 0;
});
form.appendChild(playback);
playBtn.style.display = 'flex';
pauseBtn.style.display = 'none';
startBtn.style.display = 'none';
stopBtn.style.display = 'none';
player.style.display = 'flex';
setFormDetailsVisiblity(true);
stream.getAudioTracks().forEach(track => {
track.stop();
});
stream = null;
// attaching the file
if (formFile) {
const dt = new DataTransfer();
dt.items.add(file);
formFile.files = dt.files;
}
formTabs.setAttribute('disabled', 'true');
};
}
function removeRecording() {
startBtn.style.display = 'block';
player.style.display = 'none';
form.removeChild(playback);
formFile.value = '';
setFormDetailsVisiblity(false);
formTabs.removeAttribute('disabled');
}
function playRecord() {
if (playback) playback.play();
playBtn.style.display = 'none';
pauseBtn.style.display = 'flex';
}
function pauseRecord() {
if (playback) playback.pause();
playBtn.style.display = 'flex';
pauseBtn.style.display = 'none';
}
function rewindRecord() {
currentSecond.textContent = formatTimestamp(slider.value);
if (playback) {
playback.currentTime = slider.value;
playRecord();
}
}
function formatTimestamp(timestamp) {
const m = Math.floor(timestamp / 60);
const s = Math.ceil(timestamp % 60);
return (m < 10 ? '0' : '') + m + ':' + (s < 10 ? '0' : '') + s
}
// form
document.getElementById('form-upload').addEventListener('submit', () => {
player.style.display = 'none';
startBtn.style.display = 'block';
});
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