react-native-vision-camera-face-detector/lib/module/hooks/useFaceDetectorOutput.js

Frame Processor Plugin to detect faces using MLKit Vision Face Detector for React Native Vision Camera!

"use strict";

import { useMemo, useRef } from 'react';
import { createFaceDetectorOutput } from '../factory';

// types

/**
 * Use a {@linkcode FaceDetector}.
 *
 * A {@linkcode FaceDetector} can be used to detect
 * {@linkcode Face}s in a {@linkcode Frame} in a Frame
 * Processor.
 *
 * @example
 * ```ts
 * const FaceDetector = useFaceDetector({...})
 * const frameOutput = useFrameOutput({
 *   onFrame(frame) {
 *     'worklet'
 *     const faces = FaceDetector.detectFaces(frame)
 *     console.log(`Detected ${faces.length} faces!`)
 *     frame.dispose()
 *   }
 * })
 * ```
 */
export function useFaceDetectorOutput({
  onFacesDetected,
  onError,
  outputResolution = 'preview',
  ...options
}) {
  const stableOnFacesDetected = useRef(onFacesDetected);
  stableOnFacesDetected.current = onFacesDetected;
  const stableOnError = useRef(onError);
  stableOnError.current = onError;
  return useMemo(() => createFaceDetectorOutput({
    onFacesDetected(faces) {
      stableOnFacesDetected.current(faces);
    },
    onError(error) {
      stableOnError.current(error);
    },
    outputResolution: outputResolution,
    ...options
  }), [options]);
}
export default useFaceDetectorOutput;
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