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import React, { useMemo, useEffect, useState } from 'react';
import {
audioBufferToMp3,
blobFromAudioBuffer,
cleanupFilename,
delay,
} from '../utils/utils';
interface AudioPlayerProps {
audioBuffer: AudioBuffer;
title: string;
}
export const AudioPlayer: React.FC<AudioPlayerProps> = ({
audioBuffer,
title,
}) => {
const [isConverting, setIsConverting] = useState(false);
const [mp3Buffer, setMp3Buffer] = useState<ArrayBuffer | null>(null);
const blobUrl = useMemo(() => {
const wavBlob = blobFromAudioBuffer(audioBuffer);
return URL.createObjectURL(wavBlob);
}, [audioBuffer]);
const downloadWavUrl = useMemo(() => {
const wavBlob = blobFromAudioBuffer(audioBuffer);
return URL.createObjectURL(wavBlob);
}, [audioBuffer]);
const downloadMp3Url = useMemo(() => {
if (!mp3Buffer) return '';
const mp3Blob = new Blob([mp3Buffer], { type: 'audio/mp3' });
return URL.createObjectURL(mp3Blob);
}, [audioBuffer]);
// Clean up the object URL when the component unmounts or audioBuffer changes.
useEffect(() => {
return () => URL.revokeObjectURL(blobUrl);
}, [blobUrl]);
useEffect(() => {
return () => URL.revokeObjectURL(downloadWavUrl);
}, [downloadWavUrl]);
useEffect(() => {
return () => URL.revokeObjectURL(downloadMp3Url);
}, [downloadMp3Url]);
const convertToMp3 = async () => {
setIsConverting(true);
await delay(10); // wait a bit for the button to be rendered
setMp3Buffer(audioBufferToMp3(audioBuffer));
setIsConverting(false);
};
return (
<div className="mt-4 flex items-center">
<audio controls src={blobUrl}>
Your browser does not support the audio element.
</audio>
<a
className="btn btn-sm btn-primary ml-2"
href={downloadWavUrl}
download={`Podcast_${cleanupFilename(title)}.wav`}
>
Download WAV
</a>
{mp3Buffer ? (
<a
className="btn btn-sm btn-primary ml-2"
href={downloadMp3Url}
download={`Podcast_${cleanupFilename(title)}.mp3`}
>
Download MP3
</a>
) : (
<button
className="btn btn-sm ml-2"
disabled={isConverting}
onClick={convertToMp3}
>
{isConverting
? 'Converting...'
: 'Convert to MP3 (may take ~10 seconds)'}
</button>
)}
</div>
);
};
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