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/*
* Copyright (C) 2015 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 com.android.camera.one.v2;
import android.annotation.TargetApi;
import android.hardware.camera2.CameraAccessException;
import android.hardware.camera2.CameraCharacteristics;
import android.hardware.camera2.CameraManager;
import android.os.Build.VERSION_CODES;
import com.android.camera.debug.Log;
import com.android.camera.debug.Log.Tag;
import com.android.camera.device.CameraId;
import com.android.camera.one.OneCamera.Facing;
import com.android.camera.one.OneCameraAccessException;
import com.android.camera.one.OneCameraCharacteristics;
import com.android.camera.one.OneCameraManager;
import com.android.camera.util.AndroidServices;
import com.android.camera.util.ApiHelper;
import com.google.common.base.Optional;
import java.util.Hashtable;
import javax.annotation.Nonnull;
/**
* Pick camera ids from a list of devices based on defined characteristics.
*/
@TargetApi(VERSION_CODES.LOLLIPOP)
public class Camera2OneCameraManagerImpl implements OneCameraManager {
private static final Tag TAG = new Tag("Camera2OneCamMgr");
/**
* Create a new camera2 api hardware manager.
*/
public static Optional<Camera2OneCameraManagerImpl> create() {
if (!ApiHelper.HAS_CAMERA_2_API) {
return Optional.absent();
}
CameraManager cameraManager;
try {
cameraManager = AndroidServices.instance().provideCameraManager();
} catch (IllegalStateException ex) {
Log.e(TAG, "camera2.CameraManager is not available.");
return Optional.absent();
}
Camera2OneCameraManagerImpl hardwareManager =
new Camera2OneCameraManagerImpl(cameraManager);
return Optional.of(hardwareManager);
}
private final CameraManager mCameraManager;
private Hashtable<Facing, String> mCameraFacingCache = new Hashtable<Facing, String>();
public Camera2OneCameraManagerImpl(CameraManager cameraManger) {
mCameraManager = cameraManger;
//Camera facing queries depending on camera implementation can be
//expensive and involve additional IPC with side effects. Cache front&
//back camera ids as early as possible.
if (mCameraManager != null) {
mCameraFacingCache.clear();
findFirstCameraFacing(Facing.BACK);
findFirstCameraFacing(Facing.FRONT);
}
}
@Override
public boolean hasCamera() {
try {
String[] ids = mCameraManager.getCameraIdList();
return ids != null && ids.length > 0;
} catch (CameraAccessException ex) {
Log.e(TAG, "Unable to read camera list.", ex);
return false;
}
}
@Override
public boolean hasCameraFacing(@Nonnull Facing direction) {
return findCameraId(direction) != null;
}
@Override
public CameraId findFirstCamera() {
try {
String[] ids = mCameraManager.getCameraIdList();
if(ids != null && ids.length > 0) {
return CameraId.from(ids[0]);
}
} catch (CameraAccessException ex) {
Log.e(TAG, "Unable to read camera list.", ex);
}
return null;
}
@Override
public CameraId findFirstCameraFacing(@Nonnull Facing facing) {
String cameraId = findCameraId(facing);
return (cameraId != null) ? CameraId.from(cameraId) : null;
}
@Override
public OneCameraCharacteristics getOneCameraCharacteristics(
@Nonnull CameraId key)
throws OneCameraAccessException {
return new OneCameraCharacteristicsImpl(getCameraCharacteristics(key));
}
public CameraCharacteristics getCameraCharacteristics(
@Nonnull CameraId key)
throws OneCameraAccessException {
try {
return mCameraManager.getCameraCharacteristics(key.getValue());
} catch (CameraAccessException ex) {
throw new OneCameraAccessException("Unable to get camera characteristics", ex);
}
}
/** Returns the ID of the first camera facing the given direction. */
private String findCameraId(Facing facing) {
String id = mCameraFacingCache.get(facing);
if (id != null) {
return id;
}
if (facing == Facing.FRONT) {
id = findFirstFrontCameraId();
} else {
id = findFirstBackCameraId();
}
if (id != null) {
mCameraFacingCache.put(facing, id);
}
return id;
}
/** Returns the ID of the first back-facing camera. */
private String findFirstBackCameraId() {
Log.d(TAG, "Getting First BACK Camera");
String cameraId = findFirstCameraIdFacing(CameraCharacteristics.LENS_FACING_BACK);
if (cameraId == null) {
Log.w(TAG, "No back-facing camera found.");
}
return cameraId;
}
/** Returns the ID of the first front-facing camera. */
private String findFirstFrontCameraId() {
Log.d(TAG, "Getting First FRONT Camera");
String cameraId = findFirstCameraIdFacing(CameraCharacteristics.LENS_FACING_FRONT);
if (cameraId == null) {
Log.w(TAG, "No front-facing camera found.");
}
return cameraId;
}
/** Returns the ID of the first camera facing the given direction. */
private String findFirstCameraIdFacing(int facing) {
try {
String[] cameraIds = mCameraManager.getCameraIdList();
for (String cameraId : cameraIds) {
CameraCharacteristics characteristics = mCameraManager
.getCameraCharacteristics(cameraId);
if (characteristics.get(CameraCharacteristics.LENS_FACING) == facing) {
return cameraId;
}
}
} catch (CameraAccessException ex) {
Log.w(TAG, "Unable to get camera ID", ex);
}
return null;
}
}
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