LensFacingCameraFilter.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.core.impl;
import androidx.annotation.NonNull;
import androidx.annotation.RequiresApi;
import androidx.camera.core.CameraFilter;
import androidx.camera.core.CameraInfo;
import androidx.camera.core.CameraSelector;
import androidx.core.util.Preconditions;
import java.util.ArrayList;
import java.util.List;
/**
* A filter that filters camera based on lens facing.
*/
@RequiresApi(21) // TODO(b/200306659): Remove and replace with annotation on package-info.java
public class LensFacingCameraFilter implements CameraFilter {
@CameraSelector.LensFacing
private final int mLensFacing;
public LensFacingCameraFilter(@CameraSelector.LensFacing int lensFacing) {
mLensFacing = lensFacing;
}
@NonNull
@Override
public List<CameraInfo> filter(@NonNull List<CameraInfo> cameraInfos) {
List<CameraInfo> result = new ArrayList<>();
for (CameraInfo cameraInfo : cameraInfos) {
Preconditions.checkArgument(cameraInfo instanceof CameraInfoInternal,
"The camera info doesn't contain internal implementation.");
int lensFacing = cameraInfo.getLensFacing();
if (lensFacing == mLensFacing) {
result.add(cameraInfo);
}
}
return result;
}
/** Returns the lens facing associated with this lens facing camera id filter. */
@CameraSelector.LensFacing
public int getLensFacing() {
return mLensFacing;
}
}