如何手动控制Camera2的手动对焦? [英] How to manually control Camera2 manual focus?

问题描述

我的手机支持所有手动配置.经过( https://github.com/pinguo-yuyidong/Camera2 的测试)使用搜索栏进行调整.

My phone support all manual configuration. Tested with (https://github.com/pinguo-yuyidong/Camera2) which allow us to adjust using seekbar.

我想在开始预览之前在镜头焦距"中设置一个固定值，直到关闭应用程序.

I want to set a fix value in Lens Focus Distance when preview is started until I close the app.

将自动对焦模式设置为关闭后，将镜头焦距设置为一个值.预览没有任何效果，但是Focus 2值已更改.

After I set AF mode to off and set the Lens Focus Distance with a value. The preview does not show any effect but the Focus 2 value is changed.

我该如何克服这个问题?

How can I overcome this problem?

    private CaptureRequest mPreviewRequest;
    private void startCameraPreview() throws CameraAccessException {
        SurfaceTexture texture = textureview.getSurfaceTexture();
        texture.setDefaultBufferSize(imageDimensions.getWidth(), imageDimensions.getHeight());
        Surface surface = new Surface(texture);
        mPreviewRequestBuilder = cameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
        mPreviewRequestBuilder.addTarget(surface);
        System.out.println("Focus 1 ====== "+mPreviewRequestBuilder.get(CaptureRequest.LENS_FOCUS_DISTANCE));
        cameraDevice.createCaptureSession(Arrays.asList(surface), new CameraCaptureSession.StateCallback() {
            @Override
            public void onConfigured(@NonNull CameraCaptureSession session) {
                if (cameraDevice == null) {
                    return;
                }
                cameraSession = session;

                try {
                    mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_MODE,CaptureRequest.CONTROL_AF_MODE_OFF);
                    mPreviewRequestBuilder.set(CaptureRequest.LENS_FOCUS_DISTANCE, 7.5f);
                    mPreviewRequest = mPreviewRequestBuilder.build();
                    cameraSession.setRepeatingRequest(mPreviewRequest, mCaptureCallback, backgroundHandler);
                    System.out.println("Focus 2 ====== "+mPreviewRequestBuilder.get(CaptureRequest.LENS_FOCUS_DISTANCE));
                } catch (CameraAccessException e) {
                    e.printStackTrace();
                }
            }
            @Override
            public void onConfigureFailed(@NonNull CameraCaptureSession session) {
                Toast.makeText(getApplicationContext(),"Failed",Toast.LENGTH_SHORT).show();
            }
        }, null);
    }
    
    private static final int STATE_PREVIEW = 0;
    private int mState = STATE_PREVIEW;
    private CameraCaptureSession.CaptureCallback mCaptureCallback = new CameraCaptureSession.CaptureCallback() {
        private void process(CaptureResult result){
            switch(mState){
                case STATE_PREVIEW:{
                    break;
                }
            }
        }
    };

输出

焦点1 ====== 0.0

Output

Focus 1 ====== 0.0

焦点2 ====== 7.5

Focus 2 ====== 7.5

更改值时看不到差异.

推荐答案

找到了答案

不确定为什么我需要mPreviewRequest和setRepeatingRequest 2次，但是它可以工作.

Found the answer

Not sure why I need to mPreviewRequest and setRepeatingRequest 2 times but it works.

mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_MODE,CaptureRequest.CONTROL_AF_MODE_OFF);
mPreviewRequest = mPreviewRequestBuilder.build();
cameraSession.setRepeatingRequest(mPreviewRequest, mCaptureCallback, backgroundHandler);
mPreviewRequestBuilder.set(CaptureRequest.LENS_FOCUS_DISTANCE, 7.5f);
mPreviewRequest = mPreviewRequestBuilder.build();
cameraSession.setRepeatingRequest(mPreviewRequest, mCaptureCallback, backgroundHandler);

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