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.CameraCharacteristics;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.camera.camera2.internal.compat.CameraAccessExceptionCompat;
import androidx.camera.camera2.internal.compat.CameraManagerCompat;
import androidx.camera.core.CameraSelector;
import androidx.camera.core.CameraX;
import androidx.camera.core.Logger;
import androidx.core.util.Preconditions;
/**
* Utility functions for accessing camera related parameters
*/
class CameraUtil {
private static final String TAG = "CameraUtil";
@Nullable
static String getCameraIdUnchecked(@NonNull CameraSelector cameraSelector) {
try {
return CameraX.getCameraWithCameraSelector(
cameraSelector).getCameraInfoInternal().getCameraId();
} catch (IllegalArgumentException e) {
Logger.w(TAG, "Unable to get camera id for the camera selector.");
// Returns null if there's no camera id can be found.
return null;
}
}
@Nullable
static String getCameraIdWithLensFacingUnchecked(@Nullable Integer lensFacing) {
CameraSelector cameraSelector =
new CameraSelector.Builder().requireLensFacing(lensFacing).build();
return getCameraIdUnchecked(cameraSelector);
}
static CameraCharacteristics getCameraCharacteristics(String cameraId) {
Preconditions.checkNotNull(cameraId, "Invalid camera id.");
// TODO(b/161302102): Remove usage of deprecated CameraX.getContext()
@SuppressWarnings("deprecation")
Context context = CameraX.getContext();
CameraManagerCompat cameraManager = CameraManagerCompat.from(context);
CameraCharacteristics cameraCharacteristics = null;
try {
cameraCharacteristics = cameraManager.getCameraCharacteristicsCompat(cameraId)
.toCameraCharacteristics();
} catch (CameraAccessExceptionCompat e) {
throw new IllegalArgumentException(
"Unable to retrieve info for camera with id " + cameraId + ".", e);
}
return cameraCharacteristics;
}
private CameraUtil() {
}
}