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import {
useState,
forwardRef,
useRef,
useImperativeHandle,
useEffect,
useCallback,
} from "react";
const EXAMPLE_URL =
"https://huggingface.co/datasets/Xenova/transformers.js-docs/resolve/main/whisper-timestamps-demo.mp4";
const MediaInput = forwardRef(
({ onInputChange, onTimeUpdate, ...props }, ref) => {
// UI states
const [dragging, setDragging] = useState(false);
const fileInputRef = useRef(null);
// Create a reference to the audio and video elements
const audioElement = useRef(null);
const videoElement = useRef(null);
const currentTimeRef = useRef(0);
useImperativeHandle(ref, () => ({
setMediaTime(time) {
if (audioElement.current?.src) {
audioElement.current.currentTime = time;
} else if (videoElement.current?.src) {
videoElement.current.currentTime = time;
}
currentTimeRef.current = time;
},
}));
const onBufferLoad = (arrayBuffer, type) => {
const blob = new Blob([arrayBuffer.slice(0)], { type: type });
const url = URL.createObjectURL(blob);
processFile(arrayBuffer);
// Create a URL for the Blob
if (type.startsWith("audio/")) {
// Dispose the previous source
videoElement.current.pause();
videoElement.current.removeAttribute("src");
videoElement.current.load();
audioElement.current.src = url;
} else if (type.startsWith("video/")) {
// Dispose the previous source
audioElement.current.pause();
audioElement.current.removeAttribute("src");
audioElement.current.load();
videoElement.current.src = url;
} else {
alert(`Unsupported file type: ${type}`);
}
};
const readFile = (file) => {
if (!file) return;
// file.type
const reader = new FileReader();
reader.onload = (e) => {
onBufferLoad(e.target.result, file.type);
};
reader.readAsArrayBuffer(file);
};
const handleInputChange = (event) => {
readFile(event.target.files[0]);
};
const handleDragOver = (event) => {
event.preventDefault();
};
const handleDrop = (event) => {
event.preventDefault();
setDragging(false);
readFile(event.dataTransfer.files[0]);
};
const handleClick = (e) => {
if (e.target.tagName === "VIDEO" || e.target.tagName === "AUDIO") {
e.preventDefault();
fileInputRef.current.click();
} else if (e.target.tagName === "INPUT") {
e.stopPropagation();
} else {
fileInputRef.current.click();
e.stopPropagation();
}
};
const processFile = async (buffer) => {
const audioContext = new (window.AudioContext ||
window.webkitAudioContext)({ sampleRate: 16_000 });
try {
const audioBuffer = await audioContext.decodeAudioData(buffer);
let audio;
if (audioBuffer.numberOfChannels === 2) {
// Merge channels
const SCALING_FACTOR = Math.sqrt(2);
const left = audioBuffer.getChannelData(0);
const right = audioBuffer.getChannelData(1);
audio = new Float32Array(left.length);
for (let i = 0; i < audioBuffer.length; ++i) {
audio[i] = (SCALING_FACTOR * (left[i] + right[i])) / 2;
}
} else {
audio = audioBuffer.getChannelData(0);
}
onInputChange(audio);
} catch (e) {
alert(e);
}
};
const requestRef = useRef();
const updateTime = useCallback(() => {
let elem;
if (audioElement.current?.src) {
elem = audioElement.current;
} else if (videoElement.current?.src) {
elem = videoElement.current;
}
if (elem && currentTimeRef.current !== elem.currentTime) {
currentTimeRef.current = elem.currentTime;
onTimeUpdate(elem.currentTime);
}
// Request the next frame
requestRef.current = requestAnimationFrame(updateTime);
}, [onTimeUpdate]);
useEffect(() => {
// Start the animation
requestRef.current = requestAnimationFrame(updateTime);
return () => {
// Cleanup on component unmount
cancelAnimationFrame(requestRef.current);
};
}, [updateTime]);
return (
<div
{...props}
onClick={handleClick}
onDragOver={handleDragOver}
onDrop={handleDrop}
onDragEnter={(e) => setDragging(true)}
onDragLeave={(e) => setDragging(false)}
>
<input
type="file"
accept="audio/*,video/*"
onChange={handleInputChange}
ref={fileInputRef}
className="hidden"
/>
{
<audio
ref={audioElement}
controls
style={{ display: audioElement.current?.src ? "block" : "none" }}
className="w-full max-h-full"
/>
}
{
<video
ref={videoElement}
controls
style={{ display: videoElement.current?.src ? "block" : "none" }}
className="w-full max-h-full"
/>
}
{!audioElement.current?.src && !videoElement.current?.src && (
<div
className="w-full flex flex-col items-center justify-center border-2 border-dashed border-gray-300 rounded-md h-[250px]"
style={{ borderColor: dragging ? "blue" : "lightgray" }}
>
<span className="text-gray-600 text-center">
<u>Drag & drop</u> or <u>click</u>
<br />
to select media
</span>
<span
className="text-gray-500 text-sm hover:text-gray-800 dark:hover:text-gray-300 mt-2"
onClick={async (e) => {
e.stopPropagation();
const buffer = await fetch(EXAMPLE_URL).then((r) =>
r.arrayBuffer(),
);
videoElement.current.src = URL.createObjectURL(
new Blob([buffer], { type: "video/mp4" }),
);
onBufferLoad(buffer, "video/mp4");
}}
>
(or <u>try an example</u>)
</span>
</div>
)}
</div>
);
},
);
MediaInput.displayName = "MediaInput";
export default MediaInput;
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