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import { useEffect, useRef, useState } from "react";
import WaveSurfer from "wavesurfer.js";
interface AudioWaveformProps {
audioUrl?: string;
audioBuffer?: AudioBuffer;
height?: number;
className?: string;
}
function extractPeaks({
buffer,
length = 512,
}: {
buffer: AudioBuffer;
length?: number;
}): number[][] {
const channels = buffer.numberOfChannels;
const peaks: number[][] = [];
for (let c = 0; c < channels; c++) {
const data = buffer.getChannelData(c);
const step = Math.floor(data.length / length);
const channelPeaks: number[] = [];
for (let i = 0; i < length; i++) {
const start = i * step;
const end = Math.min(start + step, data.length);
let max = 0;
for (let j = start; j < end; j++) {
const abs = Math.abs(data[j]);
if (abs > max) max = abs;
}
channelPeaks.push(max);
}
peaks.push(channelPeaks);
}
return peaks;
}
export function AudioWaveform({
audioUrl,
audioBuffer,
height = 32,
className = "",
}: AudioWaveformProps) {
const waveformRef = useRef<HTMLDivElement>(null);
const wavesurfer = useRef<WaveSurfer | null>(null);
const [isLoading, setIsLoading] = useState(true);
const [error, setError] = useState(false);
useEffect(() => {
let mounted = true;
const ws = wavesurfer.current;
const initWaveSurfer = async () => {
if (!waveformRef.current || (!audioUrl && !audioBuffer)) return;
try {
if (ws) {
wavesurfer.current = null;
}
const newWaveSurfer = WaveSurfer.create({
container: waveformRef.current,
waveColor: "rgba(255, 255, 255, 0.6)",
progressColor: "rgba(255, 255, 255, 0.9)",
cursorColor: "transparent",
barWidth: 2,
barGap: 1,
height,
normalize: true,
interact: false,
});
if (mounted) {
wavesurfer.current = newWaveSurfer;
} else {
try {
newWaveSurfer.destroy();
} catch {}
return;
}
newWaveSurfer.on("ready", () => {
if (mounted) {
setIsLoading(false);
setError(false);
}
});
newWaveSurfer.on("error", (err) => {
if (mounted) {
console.error("WaveSurfer error:", err);
setError(true);
setIsLoading(false);
}
});
if (audioBuffer) {
const peaks = extractPeaks({ buffer: audioBuffer });
newWaveSurfer.load("", peaks, audioBuffer.duration);
} else if (audioUrl) {
await newWaveSurfer.load(audioUrl);
}
} catch (err) {
if (mounted) {
console.error("Failed to initialize WaveSurfer:", err);
setError(true);
setIsLoading(false);
}
}
};
if (ws) {
const wsToDestroy = ws;
wavesurfer.current = null;
requestAnimationFrame(() => {
try {
wsToDestroy.destroy();
} catch {}
if (mounted) {
initWaveSurfer();
}
});
} else {
initWaveSurfer();
}
return () => {
mounted = false;
const wsToDestroy = wavesurfer.current;
wavesurfer.current = null;
if (wsToDestroy) {
requestAnimationFrame(() => {
try {
wsToDestroy.destroy();
} catch {}
});
}
};
}, [audioUrl, audioBuffer, height]);
if (error) {
return (
<div
className={`flex items-center justify-center ${className}`}
style={{ height }}
>
<span className="text-foreground/60 text-xs">Audio unavailable</span>
</div>
);
}
return (
<div className={`relative ${className}`}>
{isLoading && (
<div className="absolute inset-0 flex items-center justify-center">
<span className="text-foreground/60 text-xs">Loading...</span>
</div>
)}
<div
ref={waveformRef}
className={`w-full ${isLoading ? "opacity-0" : "opacity-100"}`}
style={{ height }}
/>
</div>
);
}
export default AudioWaveform;
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