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  3. android.hardware.camera2.CameraCharacteristics

Java 类android.hardware.camera2.CameraCharacteristics 实例源码

项目：PXLSRT    文件：Camera2.java    
/**
 * <p>Collects some information from {@link #mCameraCharacteristics}.</p>
 * <p>This rewrites {@link #mPreviewSizes}, {@link #mPictureSizes}, and optionally,
 * {@link #mAspectRatio}.</p>
 */
private void collectCameraInfo() {
    StreamConfigurationMap map = mCameraCharacteristics.get(
            CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);
    if (map == null) {
        throw new IllegalStateException("Failed to get configuration map: " + mCameraId);
    }
    mPreviewSizes.clear();
    for (android.util.Size size : map.getOutputSizes(mPreview.getOutputClass())) {
        mPreviewSizes.add(new Size(size.getWidth(), size.getHeight()));
    }
    mPictureSizes.clear();
    collectPictureSizes(mPictureSizes, map);

    if (!mPreviewSizes.ratios().contains(mAspectRatio)) {
        mAspectRatio = mPreviewSizes.ratios().iterator().next();
    }
}
项目：CameraSample    文件：CameraV2Activity.java    
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_camera_v2);

    CameraManager cameraManager = (CameraManager) getSystemService(CAMERA_SERVICE);
    try {
        for (String cameraId : cameraManager.getCameraIdList()) {
            CameraCharacteristics characteristics = cameraManager.getCameraCharacteristics(cameraId);
            Integer facing = characteristics.get(CameraCharacteristics.LENS_FACING);
            if (facing != null && facing.equals(CameraCharacteristics.LENS_FACING_FRONT)) {

            }
            // Do something with the characteristics
        }
    } catch (CameraAccessException e) {
        e.printStackTrace();
    }
}
项目：TK_1701    文件：Camera2.java    
public void open() {
    try {
        CameraManager manager = (CameraManager) mActivity.getSystemService(Context.CAMERA_SERVICE);
        for (String cameraId : manager.getCameraIdList()) {
            CameraCharacteristics characteristics = manager.getCameraCharacteristics(cameraId);
            if (characteristics.get(CameraCharacteristics.LENS_FACING) == CameraCharacteristics.LENS_FACING_BACK) {
                StreamConfigurationMap map = characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);
                mCameraSize = map.getOutputSizes(SurfaceTexture.class)[0];

                HandlerThread thread = new HandlerThread("OpenCamera");
                thread.start();
                Handler backgroundHandler = new Handler(thread.getLooper());

                manager.openCamera(cameraId, mCameraDeviceCallback, null);

                // カメラの物理的な情報を得る
                mCameraCharacteristics = manager.getCameraCharacteristics( cameraId );
                return;
            }
        }
    } catch (CameraAccessException e) {
        e.printStackTrace();
    }
}
项目：PXLSRT    文件：Camera2.java    
/**
 * Updates the internal state of auto-focus to {@link #mAutoFocus}.
 */
void updateAutoFocus() {
    if (mAutoFocus) {
        int[] modes = mCameraCharacteristics.get(
                CameraCharacteristics.CONTROL_AF_AVAILABLE_MODES);
        // Auto focus is not supported
        if (modes == null || modes.length == 0 ||
                (modes.length == 1 && modes[0] == CameraCharacteristics.CONTROL_AF_MODE_OFF)) {
            mAutoFocus = false;
            mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_MODE,
                    CaptureRequest.CONTROL_AF_MODE_OFF);
        } else {
            mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_MODE,
                    CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE);
        }
    } else {
        mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_MODE,
                CaptureRequest.CONTROL_AF_MODE_OFF);
    }
}
项目：android-Camera2Basic-master    文件：Camera2BasicFragment.java    
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
    switch (seekBar.getId()) {
        case R.id.iso: {
            Range<Integer> range = mCameraCharacteristics.get(CameraCharacteristics.SENSOR_INFO_SENSITIVITY_RANGE);
            int max = range.getUpper();
            int min = range.getLower();
            isoValue = ((seekBar.getProgress() * (max - min)) / 100 + min);
            createCameraPreviewSession_ISO();
            break;
        }
        case R.id.focus: {
            float distance = mCameraCharacteristics.get(CameraCharacteristics.LENS_INFO_MINIMUM_FOCUS_DISTANCE);
            focusValue = seekBar.getProgress() * distance / 100;
            createCameraPreviewSession_FOCUS();
            break;
        }
        default:
            break;
    }

}
项目：polling-station-app    文件：CameraFragmentUtil.java    
/**
 * Find out if we need to swap dimensions to get the preview size relative to sensor coordinate.
 * @param activity - The associated activity from which the camera is loaded.
 * @param characteristics - CameraCharacteristics corresponding to the current started cameradevice
 * @return swappedDimensions - A boolean value indicating if the the dimensions need to be swapped.
 */
public static boolean needSwappedDimensions(Activity activity, CameraCharacteristics characteristics) {
    int displayRotation = activity.getWindowManager().getDefaultDisplay().getRotation();
    //noinspection ConstantConditions
    int mSensorOrientation = characteristics.get(CameraCharacteristics.SENSOR_ORIENTATION);
    boolean swappedDimensions = false;
    switch (displayRotation) {
        case Surface.ROTATION_0:
        case Surface.ROTATION_90:
            if (mSensorOrientation == 90 || mSensorOrientation == 270) {
                swappedDimensions = true;
            }
            break;
        case Surface.ROTATION_180:
        case Surface.ROTATION_270:
            if (mSensorOrientation == 0 || mSensorOrientation == 180) {
                swappedDimensions = true;
            }
            break;
        default:
            Log.e(TAG, "Display rotation is invalid: " + displayRotation);
    }
    return swappedDimensions;
}
项目：habpanelviewer    文件：MotionDetectorCamera2.java    
@Override
protected String createCamera(int deviceDegrees) throws CameraException {
    try {
        for (String camId : mCamManager.getCameraIdList()) {
            CameraCharacteristics characteristics = mCamManager.getCameraCharacteristics(camId);
            Integer facing = characteristics.get(CameraCharacteristics.LENS_FACING);

            if (facing == CameraCharacteristics.LENS_FACING_FRONT) {
                Log.d(TAG, "front-facing mCamera found: " + camId);
                return camId;
            }
        }
    } catch (CameraAccessException e) {
        throw new CameraException(e);
    }

    throw new CameraException(mActivity.getString(R.string.frontCameraMissing));
}
项目：habpanelviewer    文件：MotionDetectorCamera2.java    
@Override
protected String getCameraInfo() {
    String camStr = mContext.getString(R.string.camApi2) + "\n";
    CameraManager camManager = (CameraManager) mContext.getSystemService(Context.CAMERA_SERVICE);
    try {
        for (String camId : camManager.getCameraIdList()) {
            camStr += mContext.getString(R.string.cameraId, camId) + ": ";

            CameraCharacteristics characteristics = camManager.getCameraCharacteristics(camId);
            Boolean hasFlash = characteristics.get(CameraCharacteristics.FLASH_INFO_AVAILABLE);
            Integer facing = characteristics.get(CameraCharacteristics.LENS_FACING);

            camStr += (hasFlash ? mContext.getString(R.string.has) : mContext.getString(R.string.no))
                    + " " + mContext.getString(R.string.flash) + ", ";
            camStr += (facing == CameraCharacteristics.LENS_FACING_BACK ?
                    mContext.getString(R.string.backFacing) : mContext.getString(R.string.frontFacing)) + "\n";
        }
    } catch (CameraAccessException e) {
        camStr = mActivity.getString(R.string.failedAccessCamera) + ":" + e.getMessage();
    }

    return camStr.trim();
}
项目：habpanelviewer    文件：FlashController.java    
public FlashController(Context ctx, CameraManager cameraManager, ServerConnection serverConnection) throws CameraAccessException, IllegalAccessException {
    mCtx = ctx;
    camManager = cameraManager;
    mServerConnection = serverConnection;

    EventBus.getDefault().register(this);

    for (String camId : camManager.getCameraIdList()) {
        CameraCharacteristics characteristics = camManager.getCameraCharacteristics(camId);
        Boolean hasFlash = characteristics.get(CameraCharacteristics.FLASH_INFO_AVAILABLE);
        Integer facing = characteristics.get(CameraCharacteristics.LENS_FACING);

        if (facing == CameraCharacteristics.LENS_FACING_BACK && hasFlash) {
            torchId = camId;
            break;
        }
    }

    if (torchId == null) {
        throw new IllegalAccessException(ctx.getString(R.string.couldNotFindBackFlash));
    }
}
项目：SCCameraView    文件：Camera2View.java    
@Override
public void collectRatioSizes() {
    ratioSizeList.clear();
    CameraCharacteristics characteristics;
    StreamConfigurationMap map = null;
    try {
        characteristics = ((CameraManager) getContext().getSystemService(Context.CAMERA_SERVICE)).getCameraCharacteristics(Integer.toString(Integer.parseInt(getCameraId())));
        map = characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);
    } catch (CameraAccessException e) {
        e.printStackTrace();
    }

    Size[] outputSizes = map.getOutputSizes(SurfaceTexture.class);
    if (outputSizes != null) {
        List<Double> ratioList = new ArrayList<>();
        for (Size size : outputSizes) {
            double ratio = (double) size.getWidth() / (double) size.getHeight();
            if (!ratioList.contains(ratio)) {
                ratioList.add(ratio);
                ratioSizeList.add(new AspectRatio(ratio, size.getWidth(), size.getHeight()));
            }
        }
    }
}
项目：361Camera    文件：Camera2Fragment.java    
/**
 * Rotation need to transform from the camera sensor orientation to the device's current
 * orientation.
 *
 * @param c                 the {@link CameraCharacteristics} to query for the camera sensor
 *                          orientation.
 * @param deviceOrientation the current device orientation relative to the native device
 *                          orientation.
 * @return the total rotation from the sensor orientation to the current device orientation.
 */
private static int sensorToDeviceRotation(CameraCharacteristics c, int deviceOrientation) {
    int sensorOrientation = c.get(CameraCharacteristics.SENSOR_ORIENTATION);

    // Get device orientation in degrees
    deviceOrientation = ORIENTATIONS.get(deviceOrientation);

    // Reverse device orientation for front-facing cameras
    if (c.get(CameraCharacteristics.LENS_FACING) == CameraCharacteristics.LENS_FACING_FRONT) {
        deviceOrientation = -deviceOrientation;
    }

    // Calculate desired JPEG orientation relative to camera orientation to make
    // the image upright relative to the device orientation
    return (sensorOrientation + deviceOrientation + 360) % 360;
}
项目：BWS-Android    文件：CameraCharacteristicsHelper.java    
@NonNull
private <T> T getOrThrow(@NonNull String cameraId, @NonNull CameraCharacteristics.Key<T> key) {
    try {
        CameraCharacteristics characteristics = manager.getCameraCharacteristics(cameraId);

        T value = characteristics.get(key);

        if (value == null) {
            throw new CameraException("could not determine camera characteristic " + key.getName() + " from camera " + cameraId);
        } else {
            return value;
        }
    } catch (CameraAccessException e) {
        throw new CameraException(e);
    }
}
项目：BWS-Android    文件：CameraHelper.java    
private void logSupportedHardwareLevel(@NonNull String cameraId) {
    int hardwareLevel = cameraCharacteristicsHelper.getSupportedHardwareLevel(cameraId);

    String hardwareLevelName = String.valueOf(hardwareLevel);  // for level 3 and higher
    switch (hardwareLevel) {
        case CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL_LEGACY:
            hardwareLevelName = "legacy";
            break;
        case CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL_LIMITED:
            hardwareLevelName = "limited";
            break;
        case CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL_FULL:
            hardwareLevelName = "full";
            break;
    }

    log.d("using camera with supported hardware level: %s", hardwareLevelName);
}
项目：BWS-Android    文件：CameraHelperTest.java    
@Before
public void setUp() throws Exception {
    surfaces = asList(surface1, surface2);

    when(manager.getCameraIdList()).thenReturn(new String[]{CAMERA_ID_1, CAMERA_ID_2});

    when(characteristicsHelper.getLensFacing(CAMERA_ID_1)).thenReturn(CameraCharacteristics.LENS_FACING_BACK);
    when(characteristicsHelper.getLensFacing(CAMERA_ID_2)).thenReturn(CameraCharacteristics.LENS_FACING_FRONT);
    when(characteristicsHelper.getSensorOrientation(CAMERA_ID_1)).thenReturn(SENSOR_ROTATION);
    when(characteristicsHelper.getPreviewOutputSizes(CAMERA_ID_1)).thenReturn(
            new Size[]{PREVIEWSIZE_1, PREVIEWSIZE_640x480, PREVIEWSIZE_2});

    when(camera.getId()).thenReturn(CAMERA_ID_1);
    when(camera.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW)).thenReturn(captureRequestBuilder);

    when(textureView.getSurfaceTexture()).thenReturn(surfaceTexture);
}
项目：OkayCamera-Android    文件：Utils.java    
/**
 * Rotation need to transform from the camera sensor orientation to the device's current
 * orientation.
 *
 * @param c                 the {@link CameraCharacteristics} to query for the camera sensor
 *                          orientation.
 * @param deviceOrientation the current device orientation relative to the native device
 *                          orientation.
 * @return the total rotation from the sensor orientation to the current device orientation.
 */
public static int sensorToDeviceRotation(CameraCharacteristics c, int deviceOrientation) {
    int sensorOrientation = c.get(CameraCharacteristics.SENSOR_ORIENTATION);

    // Get device orientation in degrees
    deviceOrientation = ORIENTATIONS.get(deviceOrientation);

    // Reverse device orientation for front-facing cameras
    if (c.get(CameraCharacteristics.LENS_FACING) == CameraCharacteristics.LENS_FACING_FRONT) {
        deviceOrientation = -deviceOrientation;
    }

    // Calculate desired JPEG orientation relative to camera orientation to make
    // the image upright relative to the device orientation
    return (sensorOrientation + deviceOrientation + 360) % 360;
}
项目：AppRTC-Android    文件：Camera2Session.java    
private void start() {
  checkIsOnCameraThread();
  Logging.d(TAG, "start");

  try {
    cameraCharacteristics = cameraManager.getCameraCharacteristics(cameraId);
  } catch (final CameraAccessException e) {
    reportError("getCameraCharacteristics(): " + e.getMessage());
    return;
  }
  cameraOrientation = cameraCharacteristics.get(CameraCharacteristics.SENSOR_ORIENTATION);
  isCameraFrontFacing = cameraCharacteristics.get(CameraCharacteristics.LENS_FACING)
      == CameraMetadata.LENS_FACING_FRONT;

  findCaptureFormat();
  openCamera();
}
项目：AppRTC-Android    文件：Camera2Session.java    
private void findCaptureFormat() {
  checkIsOnCameraThread();

  Range<Integer>[] fpsRanges =
      cameraCharacteristics.get(CameraCharacteristics.CONTROL_AE_AVAILABLE_TARGET_FPS_RANGES);
  fpsUnitFactor = Camera2Enumerator.getFpsUnitFactor(fpsRanges);
  List<CaptureFormat.FramerateRange> framerateRanges =
      Camera2Enumerator.convertFramerates(fpsRanges, fpsUnitFactor);
  List<Size> sizes = Camera2Enumerator.getSupportedSizes(cameraCharacteristics);
  Logging.d(TAG, "Available preview sizes: " + sizes);
  Logging.d(TAG, "Available fps ranges: " + framerateRanges);

  if (framerateRanges.isEmpty() || sizes.isEmpty()) {
    reportError("No supported capture formats.");
    return;
  }

  final CaptureFormat.FramerateRange bestFpsRange =
      CameraEnumerationAndroid.getClosestSupportedFramerateRange(framerateRanges, framerate);

  final Size bestSize = CameraEnumerationAndroid.getClosestSupportedSize(sizes, width, height);
  CameraEnumerationAndroid.reportCameraResolution(camera2ResolutionHistogram, bestSize);

  captureFormat = new CaptureFormat(bestSize.width, bestSize.height, bestFpsRange);
  Logging.d(TAG, "Using capture format: " + captureFormat);
}
项目：AppRTC-Android    文件：Camera2Enumerator.java    
/**
 * Checks if API is supported and all cameras have better than legacy support.
 */
public static boolean isSupported(Context context) {
  if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
    return false;
  }

  CameraManager cameraManager = (CameraManager) context.getSystemService(Context.CAMERA_SERVICE);
  try {
    String[] cameraIds = cameraManager.getCameraIdList();
    for (String id : cameraIds) {
      CameraCharacteristics characteristics = cameraManager.getCameraCharacteristics(id);
      if (characteristics.get(CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL)
          == CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL_LEGACY) {
        return false;
      }
    }
    // On Android OS pre 4.4.2, a class will not load because of VerifyError if it contains a
    // catch statement with an Exception from a newer API, even if the code is never executed.
    // https://code.google.com/p/android/issues/detail?id=209129
  } catch (/* CameraAccessException */ AndroidException e) {
    Logging.e(TAG, "Camera access exception: " + e);
    return false;
  }
  return true;
}
项目：SortingHatAndroid    文件：CameraConnectionFragment.java    
public void toggleFacing() {
  if (facingSelected == CameraCharacteristics.LENS_FACING_FRONT) {
    facingSelected = CameraCharacteristics.LENS_FACING_BACK;
    toggleButton.setImageResource(R.drawable.ic_camera_rear);
  } else {
    facingSelected = CameraCharacteristics.LENS_FACING_FRONT;
    toggleButton.setImageResource(R.drawable.ic_camera_front);
  }

  toggleButton.invalidate();

  closeCamera();
  if (textureView.isAvailable()) {
    openCamera(textureView.getWidth(), textureView.getHeight());
  } else {
    textureView.setSurfaceTextureListener(surfaceTextureListener);
  }
}
项目：AndroidRTC    文件：Camera2Session.java    
private void start() {
  checkIsOnCameraThread();
  Logging.d(TAG, "start");

  try {
    cameraCharacteristics = cameraManager.getCameraCharacteristics(cameraId);
  } catch (final CameraAccessException e) {
    reportError("getCameraCharacteristics(): " + e.getMessage());
    return;
  }
  cameraOrientation = cameraCharacteristics.get(CameraCharacteristics.SENSOR_ORIENTATION);
  isCameraFrontFacing = cameraCharacteristics.get(CameraCharacteristics.LENS_FACING)
      == CameraMetadata.LENS_FACING_FRONT;

  findCaptureFormat();
  openCamera();
}
项目：AndroidRTC    文件：Camera2Session.java    
private void findCaptureFormat() {
  checkIsOnCameraThread();

  Range<Integer>[] fpsRanges =
      cameraCharacteristics.get(CameraCharacteristics.CONTROL_AE_AVAILABLE_TARGET_FPS_RANGES);
  fpsUnitFactor = Camera2Enumerator.getFpsUnitFactor(fpsRanges);
  List<CaptureFormat.FramerateRange> framerateRanges =
      Camera2Enumerator.convertFramerates(fpsRanges, fpsUnitFactor);
  List<Size> sizes = Camera2Enumerator.getSupportedSizes(cameraCharacteristics);
  Logging.d(TAG, "Available preview sizes: " + sizes);
  Logging.d(TAG, "Available fps ranges: " + framerateRanges);

  if (framerateRanges.isEmpty() || sizes.isEmpty()) {
    reportError("No supported capture formats.");
    return;
  }

  final CaptureFormat.FramerateRange bestFpsRange =
      CameraEnumerationAndroid.getClosestSupportedFramerateRange(framerateRanges, framerate);

  final Size bestSize = CameraEnumerationAndroid.getClosestSupportedSize(sizes, width, height);
  CameraEnumerationAndroid.reportCameraResolution(camera2ResolutionHistogram, bestSize);

  captureFormat = new CaptureFormat(bestSize.width, bestSize.height, bestFpsRange);
  Logging.d(TAG, "Using capture format: " + captureFormat);
}
项目：AndroidRTC    文件：Camera2Enumerator.java    
/**
 * Checks if API is supported and all cameras have better than legacy support.
 */
public static boolean isSupported(Context context) {
  if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
    return false;
  }

  CameraManager cameraManager = (CameraManager) context.getSystemService(Context.CAMERA_SERVICE);
  try {
    String[] cameraIds = cameraManager.getCameraIdList();
    for (String id : cameraIds) {
      CameraCharacteristics characteristics = cameraManager.getCameraCharacteristics(id);
      if (characteristics.get(CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL)
          == CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL_LEGACY) {
        return false;
      }
    }
    // On Android OS pre 4.4.2, a class will not load because of VerifyError if it contains a
    // catch statement with an Exception from a newer API, even if the code is never executed.
    // https://code.google.com/p/android/issues/detail?id=209129
  } catch (/* CameraAccessException */ AndroidException e) {
    Logging.e(TAG, "Camera access exception: " + e);
    return false;
  }
  return true;
}
项目：GravityBox    文件：TorchService.java    
private String getCameraId() {
    if (mCameraId == null) {
        try {
            String[] ids = mCameraManager.getCameraIdList();
            for (String id : ids) {
                CameraCharacteristics c = mCameraManager.getCameraCharacteristics(id);
                Boolean flashAvailable = c.get(CameraCharacteristics.FLASH_INFO_AVAILABLE);
                Integer lensFacing = c.get(CameraCharacteristics.LENS_FACING);
                if (flashAvailable != null && flashAvailable && lensFacing != null &&
                        lensFacing == CameraCharacteristics.LENS_FACING_BACK) {
                    mCameraId = id;
                }
            }
            if (DEBUG) Log.d(TAG, "getCameraId: " + mCameraId);
        } catch (Exception e) {
            e.printStackTrace();
            mTorchStatus = TORCH_STATUS_ERROR;
            broadcastStatus();
            stopSelf();
        }
    }
    return mCameraId;
}
项目：LongImageCamera    文件：Camera2.java    
/**
 * Updates the internal state of auto-focus to {@link #mAutoFocus}.
 */
void updateAutoFocus() {
    if (mAutoFocus) {
        int[] modes = mCameraCharacteristics.get(
                CameraCharacteristics.CONTROL_AF_AVAILABLE_MODES);
        // Auto focus is not supported
        if (modes == null || modes.length == 0 ||
                (modes.length == 1 && modes[0] == CameraCharacteristics.CONTROL_AF_MODE_OFF)) {
            mAutoFocus = false;
            mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_MODE,
                    CaptureRequest.CONTROL_AF_MODE_OFF);
        } else {
            mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_MODE,
                    CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE);
        }
    } else {
        mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_MODE,
                CaptureRequest.CONTROL_AF_MODE_OFF);
    }
}
项目：VideoCRE    文件：Camera2Session.java    
private void start() {
  checkIsOnCameraThread();
  Logging.d(TAG, "start");

  try {
    cameraCharacteristics = cameraManager.getCameraCharacteristics(cameraId);
  } catch (final CameraAccessException e) {
    reportError("getCameraCharacteristics(): " + e.getMessage());
    return;
  }
  cameraOrientation = cameraCharacteristics.get(CameraCharacteristics.SENSOR_ORIENTATION);
  isCameraFrontFacing = cameraCharacteristics.get(CameraCharacteristics.LENS_FACING)
      == CameraMetadata.LENS_FACING_FRONT;

  findCaptureFormat();
  openCamera();
}
项目：VideoCRE    文件：Camera2Session.java    
private void findCaptureFormat() {
  checkIsOnCameraThread();

  Range<Integer>[] fpsRanges =
      cameraCharacteristics.get(CameraCharacteristics.CONTROL_AE_AVAILABLE_TARGET_FPS_RANGES);
  fpsUnitFactor = Camera2Enumerator.getFpsUnitFactor(fpsRanges);
  List<CaptureFormat.FramerateRange> framerateRanges =
      Camera2Enumerator.convertFramerates(fpsRanges, fpsUnitFactor);
  List<Size> sizes = Camera2Enumerator.getSupportedSizes(cameraCharacteristics);
  Logging.d(TAG, "Available preview sizes: " + sizes);
  Logging.d(TAG, "Available fps ranges: " + framerateRanges);

  if (framerateRanges.isEmpty() || sizes.isEmpty()) {
    reportError("No supported capture formats.");
    return;
  }

  final CaptureFormat.FramerateRange bestFpsRange =
      CameraEnumerationAndroid.getClosestSupportedFramerateRange(framerateRanges, framerate);

  final Size bestSize = CameraEnumerationAndroid.getClosestSupportedSize(sizes, width, height);
  //CameraEnumerationAndroid.reportCameraResolution(camera2ResolutionHistogram, bestSize);

  captureFormat = new CaptureFormat(bestSize.width, bestSize.height, bestFpsRange);
  Logging.d(TAG, "Using capture format: " + captureFormat);
}
项目：VideoCRE    文件：Camera2Enumerator.java    
/**
 * Checks if API is supported and all cameras have better than legacy support.
 */
public static boolean isSupported(Context context) {
  if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
    return false;
  }

  CameraManager cameraManager = (CameraManager) context.getSystemService(Context.CAMERA_SERVICE);
  try {
    String[] cameraIds = cameraManager.getCameraIdList();
    for (String id : cameraIds) {
      CameraCharacteristics characteristics = cameraManager.getCameraCharacteristics(id);
      if (characteristics.get(CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL)
          == CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL_LEGACY) {
        return false;
      }
    }
    // On Android OS pre 4.4.2, a class will not load because of VerifyError if it contains a
    // catch statement with an Exception from a newer API, even if the code is never executed.
    // https://code.google.com/p/android/issues/detail?id=209129
  } catch (/* CameraAccessException */ AndroidException e) {
    Logging.e(TAG, "Camera access exception: " + e);
    return false;
  }
  return true;
}
项目：xbot_head    文件：CommentaryFragment.java    
private void startPreview() {
    try {
        CameraCharacteristics characteristics = cameraManager.getCameraCharacteristics(cameraId);
        StreamConfigurationMap configMap = characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);

        Size previewSize = Util.getPreferredPreviewSize(
                configMap.getOutputSizes(ImageFormat.JPEG),textureView.getWidth(), textureView.getHeight());

        surfaceTexture.setDefaultBufferSize(previewSize.getWidth(),previewSize.getHeight());
        Surface surface = new Surface(surfaceTexture);
        captureBuilder = cameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
        captureBuilder.addTarget(surface);

        cameraDevice.createCaptureSession(Arrays.asList(surface),captureSessionCallback,backgroundHandler);
    } catch (CameraAccessException e) {
        e.printStackTrace();
    }
}
项目：CameraFragment    文件：Camera2Manager.java    
@Override
public void initializeCameraManager(ConfigurationProvider configurationProvider, Context context) {
    super.initializeCameraManager(configurationProvider, context);

    this.manager = (CameraManager) context.getSystemService(Context.CAMERA_SERVICE);

    final WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
    final Display display = windowManager.getDefaultDisplay();
    final Point size = new Point();
    display.getSize(size);
    windowSize = new Size(size.x, size.y);

    try {
        final String[] ids = manager.getCameraIdList();
        numberOfCameras = ids.length;
        for (String id : ids) {
            final CameraCharacteristics characteristics = manager.getCameraCharacteristics(id);

            final int orientation = characteristics.get(CameraCharacteristics.LENS_FACING);
            if (orientation == CameraCharacteristics.LENS_FACING_FRONT) {
                faceFrontCameraId = id;
                faceFrontCameraOrientation = characteristics.get(CameraCharacteristics.SENSOR_ORIENTATION);
                frontCameraCharacteristics = characteristics;
            } else {
                faceBackCameraId = id;
                faceBackCameraOrientation = characteristics.get(CameraCharacteristics.SENSOR_ORIENTATION);
                backCameraCharacteristics = characteristics;
            }
        }
    } catch (Exception e) {
        Log.e(TAG, "Error during camera init");
    }
}
项目：CameraFragment    文件：CameraHelper.java    
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
public static boolean hasCamera2(Context context) {
    if (context == null) return false;
    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) return false;
    try {
        CameraManager manager = (CameraManager) context.getSystemService(Context.CAMERA_SERVICE);
        String[] idList = manager.getCameraIdList();
        boolean notNull = true;
        if (idList.length == 0) {
            notNull = false;
        } else {
            for (final String str : idList) {
                if (str == null || str.trim().isEmpty()) {
                    notNull = false;
                    break;
                }
                final CameraCharacteristics characteristics = manager.getCameraCharacteristics(str);

                final int supportLevel = characteristics.get(CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL);
                if (supportLevel == CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL_LEGACY) {
                    notNull = false;
                    break;
                }
            }
        }
        return notNull;
    } catch (Throwable ignore) {
        return false;
    }
}
项目：tensorflow-classifier-android    文件：CameraActivity.java    
private boolean isHardwareLevelSupported(
    CameraCharacteristics characteristics, int requiredLevel) {
  int deviceLevel = characteristics.get(CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL);
  if (deviceLevel == CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL_LEGACY) {
    return requiredLevel == deviceLevel;
  }
  // deviceLevel is not LEGACY, can use numerical sort
  return requiredLevel <= deviceLevel;
}
项目：tensorflow-classifier-android    文件：CameraActivity.java    
private String chooseCamera() {
  final CameraManager manager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
  try {
    for (final String cameraId : manager.getCameraIdList()) {
      final CameraCharacteristics characteristics = manager.getCameraCharacteristics(cameraId);

      // We don't use a front facing camera in this sample.
      final Integer facing = characteristics.get(CameraCharacteristics.LENS_FACING);
      if (facing != null && facing == CameraCharacteristics.LENS_FACING_FRONT) {
        continue;
      }

      final StreamConfigurationMap map =
          characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);

      if (map == null) {
        continue;
      }

      useCamera2API = isHardwareLevelSupported(characteristics,
          CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL_FULL);
      LOGGER.i("Camera API lv2?: %s", useCamera2API);
      return cameraId;
    }
  } catch (CameraAccessException e) {
    LOGGER.e(e, "Not allowed to access camera");
  }

  return null;
}
项目：hella-renderscript    文件：BaseViewfinderActivity.java    
/**
 * Configure the surfaceview and RS processing.
 */
private void configureSurfaces() {
    // Find a good size for output - largest 16:9 aspect ratio that's less than 720p
    final int MAX_WIDTH = 1280;
    final float TARGET_ASPECT = 16.f / 9.f;
    final float ASPECT_TOLERANCE = 0.1f;

    StreamConfigurationMap configs =
            mCameraInfo.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);

    Size[] outputSizes = configs.getOutputSizes(SurfaceHolder.class);

    Size outputSize = outputSizes[0];
    float outputAspect = (float) outputSize.getWidth() / outputSize.getHeight();
    for (Size candidateSize : outputSizes) {
        if (candidateSize.getWidth() > MAX_WIDTH)
            continue;
        float candidateAspect = (float) candidateSize.getWidth() / candidateSize.getHeight();
        boolean goodCandidateAspect =
                Math.abs(candidateAspect - TARGET_ASPECT) < ASPECT_TOLERANCE;
        boolean goodOutputAspect = Math.abs(outputAspect - TARGET_ASPECT) < ASPECT_TOLERANCE;
        if ((goodCandidateAspect && !goodOutputAspect) ||
                candidateSize.getWidth() > outputSize.getWidth()) {
            outputSize = candidateSize;
            outputAspect = candidateAspect;
        }
    }
    Log.i(TAG, "Resolution chosen: " + outputSize);

    setupProcessing(outputSize);

    // this will trigger onSurfaceChanged()
    getViewfinderSurfaceView().getHolder()
            .setFixedSize(outputSize.getWidth(), outputSize.getHeight());
    getViewfinderSurfaceView().setAspectRatio(outputAspect);
}
项目：Camera2Vision    文件：Camera2Source.java    
public boolean isCamera2Native() {
    try {
        if (ContextCompat.checkSelfPermission(mContext, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {return false;}
        manager = (CameraManager) mContext.getSystemService(Context.CAMERA_SERVICE);
        mCameraId = manager.getCameraIdList()[mFacing];
        CameraCharacteristics characteristics = manager.getCameraCharacteristics(mCameraId);
        //CHECK CAMERA HARDWARE LEVEL. IF CAMERA2 IS NOT NATIVELY SUPPORTED, GO BACK TO CAMERA1
        Integer deviceLevel = characteristics.get(CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL);
        return deviceLevel != null && (deviceLevel != CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL_LEGACY);
    }
    catch (CameraAccessException ex) {return false;}
    catch (NullPointerException e) {return false;}
    catch (ArrayIndexOutOfBoundsException ez) {return false;}
}
项目：habpanelviewer    文件：MotionDetectorCamera2.java    
@Override
protected int getSensorOrientation() {
    try {
        CameraCharacteristics characteristics
                = mCamManager.getCameraCharacteristics(String.valueOf(mCameraId));
        return characteristics.get(CameraCharacteristics.SENSOR_ORIENTATION);
    } catch (CameraAccessException e) {
        Log.e(TAG, "Couldn't find out camera sensor orientation");
    }

    return 0;
}
项目：SCCameraView    文件：Camera2View.java    
private String getCameraId() throws CameraAccessException {
    int camera = frontFacingCameraActive ? CameraCharacteristics.LENS_FACING_FRONT
                                         : CameraCharacteristics.LENS_FACING_BACK;
    for (String cameraId : cameraManager.getCameraIdList()) {
        CameraCharacteristics cameraCharacteristics = cameraManager.getCameraCharacteristics(cameraId);

        if (cameraCharacteristics.get(CameraCharacteristics.LENS_FACING)
                == camera) {
            return cameraId;
        }
    }
    return null;
}
项目：361Camera    文件：Camera2Fragment.java    
private void triggerFocusArea(float x, float y) {
    CameraManager manager = (CameraManager) getActivity().getSystemService(Context.CAMERA_SERVICE);
    try {
        CameraCharacteristics characteristics
                = manager.getCameraCharacteristics(mCameraId);
        Integer sensorOrientation = characteristics.get(
                CameraCharacteristics.SENSOR_ORIENTATION);

        sensorOrientation = sensorOrientation == null ? 0 : sensorOrientation;

        Rect cropRegion = AutoFocusHelper.cropRegionForZoom(characteristics, 1f);
        mAERegions = AutoFocusHelper.aeRegionsForNormalizedCoord(x, y, cropRegion, sensorOrientation);
        mAFRegions = AutoFocusHelper.afRegionsForNormalizedCoord(x, y, cropRegion, sensorOrientation);

        // Step 1: Request single frame CONTROL_AF_TRIGGER_START.
        CaptureRequest.Builder builder;
        builder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
        builder.addTarget(mPreviewSurface);
        builder.set(CaptureRequest.CONTROL_MODE, CameraMetadata.CONTROL_MODE_AUTO);

        mControlAFMode = AutoFocusMode.AUTO;

        builder.set(CaptureRequest.CONTROL_AF_MODE, mControlAFMode.switchToCamera2FocusMode());
        builder.set(CaptureRequest.CONTROL_AF_TRIGGER, CaptureRequest.CONTROL_AF_TRIGGER_START);
        mCaptureSession.capture(builder.build(), mPreCaptureCallback, mBackgroundHandler);

        // Step 2: Call repeatingPreview to update mControlAFMode.
        sendRepeatPreviewRequest();
        resumeContinuousAFAfterDelay(DELAY_TIME_RESUME_CONTINUOUS_AF);
    } catch (CameraAccessException ex) {
        Log.e(TAG, "Could not execute preview request.", ex);
    }
}
项目：361Camera    文件：Camera2Fragment.java    
private ImageSaver(Image image, File file, CaptureResult result,
                   CameraCharacteristics characteristics, Context context,
                   RefCountedAutoCloseable<ImageReader> reader) {
    mImage = image;
    mFile = file;
    mCaptureResult = result;
    mCharacteristics = characteristics;
    mContext = context;
    mReader = reader;
}
项目：361Camera    文件：CameraUtil.java    
public static int getJPEGOrientation(int rotation, CameraCharacteristics cameraCharacteristics) {
    Integer sensorOrientation = cameraCharacteristics.get(CameraCharacteristics.SENSOR_ORIENTATION);
    sensorOrientation = sensorOrientation == null ? 0 : sensorOrientation;
    // Sensor orientation is 90 for most devices, or 270 for some devices (eg. Nexus 5X)
    // We have to take that into account and rotate JPEG properly.
    // For devices with orientation of 90, we simply return our mapping from ORIENTATIONS.
    // For devices with orientation of 270, we need to rotate the JPEG 180 degrees.
    return (ORIENTATIONS.get(rotation) + sensorOrientation + 270) % 360;
}
项目：361Camera    文件：AutoFocusHelper.java    
/**
 * Calculates sensor crop region for a zoom level (zoom >= 1.0).
 *
 * @return Crop region.
 */
public static Rect cropRegionForZoom(CameraCharacteristics characteristics, float zoom) {
    Rect sensor = characteristics.get(CameraCharacteristics.SENSOR_INFO_ACTIVE_ARRAY_SIZE);
    int xCenter = sensor.width() / 2;
    int yCenter = sensor.height() / 2;
    int xDelta = (int) (0.5f * sensor.width() / zoom);
    int yDelta = (int) (0.5f * sensor.height() / zoom);
    return new Rect(xCenter - xDelta, yCenter - yDelta, xCenter + xDelta, yCenter + yDelta);
}