如何高效处理相机拍照/录像并实时添加滤镜？

import camera from '@ohos.multimedia.camera';

// 初始化相机设备
async function initCamera() {
    try {
        const cameraAbility = await camera.getCameraAbility('0'); // 这里假设使用后置摄像头0
        const cameraDevice = await camera.createCameraDevice(cameraAbility);
        const previewConfig = new camera.PreviewConfig(cameraAbility);
        previewConfig.setResolutionMode(camera.ResolutionMode.AUTO);
        const preview = new camera.Preview(cameraDevice, previewConfig);
        // 将预览画面显示到UI上，这里假设存在一个id为previewSurface的Surface
        const surface = await camera.createSurface('previewSurface');
        preview.bindSurface(surface);
        await preview.start();
        return { cameraDevice, preview };
    } catch (error) {
        console.error('相机初始化失败:', error);
    }
}
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import image from '@ohos.multimedia.image';

// 定义一个简单的灰度滤镜示例
async function applyGrayFilter(imageData) {
    const bitmap = await image.createBitmap(imageData);
    const width = bitmap.width;
    const height = bitmap.height;
    const pixels = new Uint8ClampedArray(width * height * 4);
    bitmap.getPixels(pixels);
    for (let i = 0; i < pixels.length; i += 4) {
        const gray = (pixels[i] + pixels[i + 1] + pixels[i + 2]) / 3;
        pixels[i] = gray;
        pixels[i + 1] = gray;
        pixels[i + 2] = gray;
    }
    const newBitmap = await image.createBitmap(width, height, image.ColorFormat.ARGB_8888, pixels);
    return newBitmap;
}
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async function startPreviewWithFilter() {
    const { cameraDevice, preview } = await initCamera();
    preview.on('frameArrived', async (frame) => {
        const imageData = frame.data;
        const filteredBitmap = await applyGrayFilter(imageData);
        // 将处理后的图像数据显示到预览界面，这里简化处理，实际应用需要更复杂的操作
        const newSurface = await camera.createSurface('previewSurface');
        const newPreview = new camera.Preview(cameraDevice, new camera.PreviewConfig(cameraAbility));
        newPreview.bindSurface(newSurface);
        await newPreview.start();
    });
}
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async function takePicture() {
    const { cameraDevice } = await initCamera();
    const captureConfig = new camera.CaptureConfig(cameraDevice.cameraAbility);
    const result = await cameraDevice.capture(captureConfig);
    const imageData = result[0].data;
    const filteredBitmap = await applyGrayFilter(imageData);
    // 保存处理后的图像，例如保存到相册
    const imageUtils = await import('@ohos.multimedia.imageUtils');
    await imageUtils.saveImageToGallery(filteredBitmap, 'filtered_image.jpg');
}
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import mediaRecorder from '@ohos.multimedia.mediaRecorder';

async function startRecording() {
    const { cameraDevice } = await initCamera();
    const mediaRecorderConfig = new mediaRecorder.MediaRecorderConfig();
    mediaRecorderConfig.source = mediaRecorder.Source.CAMERA;
    mediaRecorderConfig.outputFormat = mediaRecorder.OutputFormat.MPEG_4;
    mediaRecorderConfig.audioEncoder = mediaRecorder.AudioEncoder.AAC;
    mediaRecorderConfig.videoEncoder = mediaRecorder.VideoEncoder.H264;
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