創建固定焦距預覽所需的最小CaptureRequest

Question

下面的代碼片段無法爲具有固定焦距的預覽創建CaptureRequest。即使TotalCaptureRequest的報告另有說明，預覽中顯示的圖像也始終集中在無限遠處。

以下是代碼片段：

mPreviewBuilder = mCameraDevice.createCaptureRequest(SCameraDevice.TEMPLATE_PREVIEW); 
mPreviewBuilder.set(SCaptureRequest.LENS_FOCUS_DISTANCE, 9.5f); 
mPreviewBuilder.set(SCaptureRequest.CONTROL_AF_MODE, SCaptureRequest.CONTROL_AF_MODE_OFF); 

我的設備是一個三星Galaxy S7其中報道了背面相機的以下屬性： [代碼] CAMID：0 LensFace：BACK HwdSupportLevel：FULL SensorOrientation ：90 LensCalibration：CALIBRATED LensMinFocusDist：10.0 [/代碼]

這是我的日誌時的onCaptureComplete()

callback: AF_STATE: 0 Lens Focus Distance: 9.555555 LENS_STATE: 0 HAS FOCUS RANGE: true Focus Range Min: 9.762765, Max: 9.348346 

捕獲

我已經與普通老式的Android Camera2 API以及與三星SDK試過這種（在這裏找到：http://developer.samsung.com/galaxy/camera）

三星自家的相機應用和攝像頭FV-5的支持，沒有任何問題，這個功能。

我如何得到這個工作？

添加一些代碼上下文

/** 
* Start the camera preview. 
*/ 
private void startPreview() { 
    if (null == mCameraDevice || !mTextureView.isAvailable() || null == mPreviewSize) { 
     return; 
    } 
    try { 
     closePreviewSession(); 
     SurfaceTexture texture = mTextureView.getSurfaceTexture(); 
     assert texture != null; 
     texture.setDefaultBufferSize(mPreviewSize.getWidth(), mPreviewSize.getHeight()); 
     mPreviewBuilder = mCameraDevice.createCaptureRequest(SCameraDevice.TEMPLATE_PREVIEW); 
     //mPreviewBuilder.set(SCaptureRequest.CONTROL_CAPTURE_INTENT, SCaptureRequest.CONTROL_CAPTURE_INTENT_MANUAL); 
     //mPreviewBuilder.set(SCaptureRequest.CONTROL_MODE, SCaptureRequest.CONTROL_MODE_OFF); 
     mPreviewBuilder.set(SCaptureRequest.CONTROL_AF_MODE, SCaptureRequest.CONTROL_AF_MODE_OFF); 
     mPreviewBuilder.set(SCaptureRequest.CONTROL_AE_MODE, SCaptureRequest.CONTROL_AE_MODE_ON); 
     mPreviewBuilder.set(SCaptureRequest.LENS_FOCUS_DISTANCE, 9.5f); 

     Surface previewSurface = new Surface(texture); 
     mPreviewBuilder.addTarget(previewSurface); 

     mCameraDevice.createCaptureSession(Arrays.asList(previewSurface), new SCameraCaptureSession.StateCallback() { 

      @Override 
      public void onConfigured(SCameraCaptureSession cameraCaptureSession) { 
       mPreviewSession = cameraCaptureSession; 
       updatePreview(); 
      } 

      @Override 
      public void onConfigureFailed(SCameraCaptureSession cameraCaptureSession) { 
       Toast.makeText(getApplicationContext(),"Failed", Toast.LENGTH_SHORT).show(); 
      } 
     }, mBackgroundHandler); 


    } catch (CameraAccessException e) { 
     e.printStackTrace(); 
    } 
} 


/** 
* Update the camera preview. {@link #startPreview()} needs to be called in advance. 
*/ 
private void updatePreview() { 
    if (null == mCameraDevice) { 
     return; 
    } 
    try { 
     setUpCaptureRequestBuilder(mPreviewBuilder); 
     HandlerThread thread = new HandlerThread("CameraPreview"); 
     thread.start(); 
     mPreviewSession.setRepeatingRequest(mPreviewBuilder.build(), mCaptureCallBack, mBackgroundHandler); 
     Log.i(TAG, "New Session values, control mode " + mPreviewBuilder.get(SCaptureRequest.CONTROL_MODE) + 
       ", AF mode: " + mPreviewBuilder.get(SCaptureRequest.CONTROL_AF_MODE) + 
       ", Focus value; " + +mPreviewBuilder.get(SCaptureRequest.LENS_FOCUS_DISTANCE)); 
    } catch (CameraAccessException e) { 
     e.printStackTrace(); 
    } 
} 

Answer 1

你有沒有添加了表面您mPreviewBuilder？

Surface surface = new Surface(texture); 
//Add surfaces 
mPreviewBuilder.addTarget(surface); 
surfaces.add(surface); 

二，設置您的AF_MODE熄滅前設置LENS_FOCUS_DISTANCE，最後用setRepeatingRequest在你CaptureSesion更新使sesion。有了它，它必須工作。

mCaptureSession.setRepeatingRequest(mPreviewBuilder.build(), 
       callback, mHandler); 

檢查與記錄您的CaptureRequest的值來檢查一切是正確的，你不重疊的東西在你的AF：

Log.i(TAG, "New Session values, control mode " + mPreviewRequestBuilder.get(CaptureRequest.CONTROL_MODE) + 
      ", AF mode: " + mPreviewRequestBuilder.get(CaptureRequest.CONTROL_AF_MODE) + 
      ", Focus value; " + +mPreviewRequestBuilder.get(CaptureRequest.LENS_FOCUS_DISTANCE));