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/*
* Copyright (C) 2014 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;
import android.content.Context;
import android.hardware.camera2.CameraAccessException;
import android.hardware.camera2.CameraCharacteristics;
import android.hardware.camera2.CameraManager;
import android.util.DisplayMetrics;
import android.view.WindowManager;
import com.android.camera.CameraActivity;
import com.android.camera.debug.Log;
import com.android.camera.debug.Log.Tag;
import com.android.camera.one.OneCamera.Facing;
import com.android.camera.one.OneCamera.OpenCallback;
import com.android.camera.util.Size;
/**
* The camera manager is responsible for instantiating {@link OneCamera}
* instances.
*/
public abstract class OneCameraManager {
private static Tag TAG = new Tag("OneCameraManager");
/**
* Attempts to open the camera facing the given direction with the given
* capture size.
*
* @param facing which camera to open. The first camera found in the given
* direction will be opened.
* @param enableHdr if an HDR feature exists, open a camera that supports it
* @param captureSize the capture size. This must be one of the supported
* sizes.
* @param callback this listener is called when the camera was opened or
* when it failed to open.
*/
public abstract void open(Facing facing, boolean enableHdr, Size captureSize,
OpenCallback callback);
/**
* Returns whether the device has a camera facing the given direction.
*/
public abstract boolean hasCameraFacing(Facing facing);
/**
* Singleton camera manager to be used throughout the app.
*/
private static OneCameraManager sCameraManager;
/**
* Returns a camera manager that is based on Camera2 API, if available, or
* otherwise uses the portability layer API.
* <p>
* The instance is created the first time this method is called and cached
* in a singleton thereafter, so successive calls are cheap.
*/
public static OneCameraManager get(CameraActivity activity) {
if (sCameraManager == null) {
sCameraManager = create(activity);
}
return sCameraManager;
}
/**
* Creates a new camera manager that is based on Camera2 API, if available,
* or otherwise uses the portability API.
*/
private static OneCameraManager create(CameraActivity activity) {
DisplayMetrics displayMetrics = getDisplayMetrics(activity);
CameraManager cameraManager = (CameraManager) activity
.getSystemService(Context.CAMERA_SERVICE);
int maxMemoryMB = activity.getServices().getMemoryManager()
.getMaxAllowedNativeMemoryAllocation();
if (cameraManager != null && isCamera2FullySupported(cameraManager)) {
return new com.android.camera.one.v2.OneCameraManagerImpl(cameraManager, maxMemoryMB,
displayMetrics);
} else {
return new com.android.camera.one.v1.OneCameraManagerImpl();
}
}
/**
* Returns whether the device fully supports API2,
*
* @param cameraManager the Camera2 API manager.
* @return If this device is only emulating Camera2 API on top of an older
* HAL (such as the Nexus 4, 7 or 10), this method returns false. It
* only returns true, if Camera2 is fully supported through newer
* HALs.
*/
private static boolean isCamera2FullySupported(CameraManager cameraManager) {
try {
final String id = cameraManager.getCameraIdList()[0];
return cameraManager.getCameraCharacteristics(id).get(
CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL)
== CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL_FULL;
} catch (CameraAccessException ex) {
Log.e(TAG, "Could not access camera to determine hardware-level API support.");
return false;
}
}
private static DisplayMetrics getDisplayMetrics(Context context) {
DisplayMetrics displayMetrics = new DisplayMetrics();
WindowManager wm = (WindowManager)
context.getSystemService(Context.WINDOW_SERVICE);
if (wm != null) {
displayMetrics = new DisplayMetrics();
wm.getDefaultDisplay().getMetrics(displayMetrics);
}
return displayMetrics;
}
}
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