CameraUtil.java
/*
* Copyright 2019 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package androidx.camera.extensions;
import android.content.Context;
import android.hardware.camera2.CameraAccessException;
import android.hardware.camera2.CameraCharacteristics;
import android.hardware.camera2.CameraManager;
import android.util.Log;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.camera.core.CameraDeviceConfig;
import androidx.camera.core.CameraInfoUnavailableException;
import androidx.camera.core.CameraSelector;
import androidx.camera.core.CameraX;
import androidx.camera.core.LensFacingCameraIdFilter;
import androidx.camera.core.impl.utils.CameraSelectorUtil;
import java.util.Set;
/**
* Utility functions for accessing camera related parameters
*/
class CameraUtil {
private static final String TAG = "CameraUtil";
@Nullable
static String getCameraId(@NonNull CameraSelector cameraSelector) {
try {
CameraDeviceConfig config = CameraSelectorUtil.toCameraDeviceConfig(cameraSelector);
return CameraX.getCameraWithCameraDeviceConfig(config);
} catch (CameraInfoUnavailableException e) {
Log.w(TAG, "Unable to get camera id for the camera device config.");
// Returns null if there's no camera id can be found.
return null;
}
}
@NonNull
static Set<String> getCameraIdSetWithLensFacing(@Nullable Integer lensFacing)
throws CameraInfoUnavailableException {
Set<String> availableCameraIds = CameraX.getCameraFactory().getAvailableCameraIds();
LensFacingCameraIdFilter lensFacingCameraIdFilter =
CameraX.getCameraFactory().getLensFacingCameraIdFilter(lensFacing);
availableCameraIds = lensFacingCameraIdFilter.filter(availableCameraIds);
return availableCameraIds;
}
static CameraCharacteristics getCameraCharacteristics(String cameraId) {
Context context = CameraX.getContext();
CameraManager cameraManager = (CameraManager) context.getSystemService(
Context.CAMERA_SERVICE);
CameraCharacteristics cameraCharacteristics = null;
try {
cameraCharacteristics = cameraManager.getCameraCharacteristics(cameraId);
} catch (CameraAccessException e) {
throw new IllegalArgumentException(
"Unable to retrieve info for camera with id " + cameraId + ".", e);
}
return cameraCharacteristics;
}
private CameraUtil() {
}
}