Camera2CameraFactory.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.internal;
import android.content.Context;
import android.hardware.camera2.CameraAccessException;
import androidx.annotation.NonNull;
import androidx.camera.camera2.internal.compat.CameraManagerCompat;
import androidx.camera.core.CameraInfoUnavailableException;
import androidx.camera.core.impl.CameraFactory;
import androidx.camera.core.impl.CameraInternal;
import androidx.camera.core.impl.CameraStateRegistry;
import androidx.camera.core.impl.CameraThreadConfig;
import java.util.Arrays;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;
/**
* The factory class that creates {@link Camera2CameraImpl} instances.
*/
public final class Camera2CameraFactory implements CameraFactory {
private static final int DEFAULT_ALLOWED_CONCURRENT_OPEN_CAMERAS = 1;
private final CameraThreadConfig mThreadConfig;
private final CameraStateRegistry mCameraStateRegistry;
private final CameraManagerCompat mCameraManager;
/** Creates a Camera2 implementation of CameraFactory */
public Camera2CameraFactory(@NonNull Context context,
@NonNull CameraThreadConfig threadConfig) {
mThreadConfig = threadConfig;
mCameraStateRegistry = new CameraStateRegistry(DEFAULT_ALLOWED_CONCURRENT_OPEN_CAMERAS);
mCameraManager = CameraManagerCompat.from(context, mThreadConfig.getSchedulerHandler());
}
@Override
@NonNull
public CameraInternal getCamera(@NonNull String cameraId)
throws CameraInfoUnavailableException {
if (!getAvailableCameraIds().contains(cameraId)) {
throw new IllegalArgumentException(
"The given camera id is not on the available camera id list.");
}
return new Camera2CameraImpl(mCameraManager, cameraId, mCameraStateRegistry,
mThreadConfig.getCameraExecutor(), mThreadConfig.getSchedulerHandler());
}
@Override
@NonNull
public Set<String> getAvailableCameraIds() throws CameraInfoUnavailableException {
List<String> camerasList;
try {
camerasList = Arrays.asList(mCameraManager.unwrap().getCameraIdList());
} catch (CameraAccessException e) {
throw new CameraInfoUnavailableException(
"Unable to retrieve list of cameras on device.", e);
}
// Use a LinkedHashSet to preserve order
return new LinkedHashSet<>(camerasList);
}
}