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webcodecs-opus-recorder-mse-wav-player.html
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webcodecs-opus-recorder-mse-wav-player.html
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<!DOCTYPE html>
<html>
<head>
<title>
WebCodecs Opus Recorder/Media Source Extensions Opus EncodedAudioChunk,
WAV Player
</title>
<style>
fieldset {
width: 300px;
}
fieldset input,
label,
select,
audio {
position: relative;
display: block;
}
#file, #clear {
display:inline-block;
}
#file {
width: 200px;
}
</style>
</head>
<body>
<p>WebCodecs Opus Recorder and Player</p>
<button id="record">Record</button>
<button id="stop">Stop</button>
<br />
<label for="playback-type">Playback type:</label>
<select id="playback-type">
<option selected value="mediaSource">MediaSource</option>
<option value="wav">WAV</option>
</select>
<label for="media-session-metadata">
<code>MediaSession</code>
metadata:
</label>
<input
type="checkbox"
name="media-session-metadata"
id="media-session-metadata"
/>
<fieldset id="meta" disabled>
<label for="album">Album:</label>
<input type="text" id="album" name="album" />
<label for="artist">Artist:</label>
<input type="text" id="artist" name="artist" />
<label for="title">Title:</label>
<input type="text" id="title" name="title" />
<label for="artwork">Artwork:</label>
<input type="file" id="artwork" name="artwork" accept="image/*" />
</fieldset>
<label for="upload">
<code>.opus.webcodecs</code>
file upload:
</label>
<input type="file" accept=".opus.webcodecs" id="file" name="upload" />
<input type="button" id="clear" value="Clear file selection" />
<script type="module">
import {
WebCodecsOpusRecorder,
WebCodecsOpusPlayer,
WavAudioEncoder,
} from './WebCodecsOpusRecorder.js';
let webcodecsOpusRecorder, mediaRecorder, stream, track, audio;
document.getElementById('media-session-metadata').onchange = (e) => {
document.getElementById('meta').disabled = !e.target.checked;
};
document.getElementById('clear').onclick = (e) => {
document.getElementById('file').value = '';
};
document.getElementById('record').onclick = async () => {
stream = await navigator.mediaDevices.getUserMedia({
audio: {
echoCancellation: false,
noiseSupression: false,
autoGainControl: false,
channelCount: 2,
},
});
[track] = stream.getAudioTracks();
if (stream.getVideoTracks().length) {
stream.getVideoTracks()[0].stop();
stream.removeTrack(stream.getVideoTracks()[0]);
}
webcodecsOpusRecorder = new WebCodecsOpusRecorder(track);
webcodecsOpusRecorder.start();
console.log(
track.label,
await track.getConstraints(),
track.getSettings()
);
};
document.getElementById('stop').onclick = async () => {
if (!document.getElementById('meta').disabled) {
const metadata = {};
document
.querySelectorAll(
'input[name=artist], input[name=album], input[name=title]'
)
.forEach((el) => {
metadata[el.name] = el.value;
});
const ctx = document.createElement('canvas').getContext('2d');
const [artworkFile] = document.querySelector('#artwork').files;
const setArtwork = async (blob, context) => {
return [{
src: `data:${blob.type};base64,${btoa(
new Uint8Array(await blob.arrayBuffer()).reduce((acc, i) =>
acc += String.fromCharCode.apply(null, [i]), '')
)}`,
type: blob.type,
sizes: `${context.width}x${context.height}`,
}]
}
if (artworkFile) {
metadata.artwork = await setArtwork(artworkFile, await createImageBitmap(artworkFile));
} else {
ctx.fillStyle = 'goldenrod';
ctx.fillRect(0, 0, ctx.canvas.width, ctx.canvas.height);
const blob = await new Promise((resolve) =>
ctx.canvas.toBlob(resolve)
);
metadata.artwork = await setArtwork(blob, ctx.canvas);
}
console.log(metadata, webcodecsOpusRecorder);
webcodecsOpusRecorder.metadata.mediaSessionMetadata = metadata;
}
webcodecsOpusRecorder.stop();
};
document.getElementById('file').onchange = async ({
target: {
files: [file],
},
}) => {
if (file) {
const webcodecsOpusPlayer = new WebCodecsOpusPlayer(
await file.arrayBuffer(),
{
type: document.getElementById('playback-type').value,
}
);
await webcodecsOpusPlayer.play();
}
};
</script>
</body>
</html>