Camera2LensFacingCameraIdFilter.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.camera2.impl;
import android.hardware.camera2.CameraAccessException;
import android.hardware.camera2.CameraCharacteristics;
import android.hardware.camera2.CameraManager;
import android.hardware.camera2.CameraMetadata;
import android.util.Log;
import androidx.annotation.NonNull;
import androidx.annotation.RestrictTo;
import androidx.camera.core.LensFacing;
import androidx.camera.core.LensFacingCameraIdFilter;
import java.util.LinkedHashSet;
import java.util.Set;
/**
* Filter camera id by lens facing.
*
* @hide
*/
@RestrictTo(RestrictTo.Scope.LIBRARY_GROUP)
public final class Camera2LensFacingCameraIdFilter extends LensFacingCameraIdFilter {
private static final String TAG = "Camera2LensFacingCIF";
private CameraManager mCameraManager;
Camera2LensFacingCameraIdFilter(@LensFacing int lensFacing,
@NonNull CameraManager cameraManager) {
super(lensFacing);
mCameraManager = cameraManager;
}
@Override
@NonNull
public Set<String> filter(@NonNull Set<String> cameraIdSet) {
Set<String> resultCameraIdSet = new LinkedHashSet<>();
for (String cameraId : cameraIdSet) {
Integer lensFacingInteger = null;
try {
lensFacingInteger = mCameraManager.getCameraCharacteristics(cameraId).get(
CameraCharacteristics.LENS_FACING);
} catch (CameraAccessException e) {
Log.e(TAG, "Unable to retrieve info for camera with id " + cameraId + ".", e);
}
if (lensFacingInteger == null) {
continue;
}
if (lensFacingInteger.equals(cameraXLensFacingToCamera2LensFacing(getLensFacing()))) {
resultCameraIdSet.add(cameraId);
}
}
return resultCameraIdSet;
}
private Integer cameraXLensFacingToCamera2LensFacing(@LensFacing int lensFacing) {
Integer lensFacingInteger = -1;
switch (lensFacing) {
case LensFacing.BACK:
lensFacingInteger = CameraMetadata.LENS_FACING_BACK;
break;
case LensFacing.FRONT:
lensFacingInteger = CameraMetadata.LENS_FACING_FRONT;
break;
}
return lensFacingInteger;
}
}