/*
* 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.systemui.statusbar.policy;
import android.content.Context;
import android.graphics.SurfaceTexture;
import android.hardware.camera2.CameraAccessException;
import android.hardware.camera2.CameraCaptureSession;
import android.hardware.camera2.CameraCharacteristics;
import android.hardware.camera2.CameraDevice;
import android.hardware.camera2.CameraManager;
import android.hardware.camera2.CameraMetadata;
import android.hardware.camera2.CaptureRequest;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.Process;
import android.os.SystemProperties;
import android.util.Log;
import android.util.Size;
import android.view.Surface;
import java.lang.ref.WeakReference;
import java.util.ArrayList;
/**
* Manages the flashlight.
*/
public class FlashlightController {
private static final String TAG = "FlashlightController";
private static final boolean DEBUG = Log.isLoggable(TAG, Log.DEBUG);
private static final int DISPATCH_ERROR = 0;
private static final int DISPATCH_OFF = 1;
private static final int DISPATCH_AVAILABILITY_CHANGED = 2;
private final CameraManager mCameraManager;
/** Call {@link #ensureHandler()} before using */
private Handler mHandler;
/** Lock on mListeners when accessing */
private final ArrayList<WeakReference<FlashlightListener>> mListeners = new ArrayList<>(1);
/** Lock on {@code this} when accessing */
private boolean mFlashlightEnabled;
private String mCameraId;
private boolean mCameraAvailable;
private CameraDevice mCameraDevice;
private CaptureRequest mFlashlightRequest;
private CameraCaptureSession mSession;
private SurfaceTexture mSurfaceTexture;
private Surface mSurface;
public FlashlightController(Context mContext) {
mCameraManager = (CameraManager) mContext.getSystemService(Context.CAMERA_SERVICE);
initialize();
}
public void initialize() {
try {
mCameraId = getCameraId();
} catch (Throwable e) {
Log.e(TAG, "Couldn't initialize.", e);
return;
}
if (mCameraId != null) {
ensureHandler();
mCameraManager.registerAvailabilityCallback(mAvailabilityCallback, mHandler);
}
}
public synchronized void setFlashlight(boolean enabled) {
if (mFlashlightEnabled != enabled) {
mFlashlightEnabled = enabled;
postUpdateFlashlight();
}
}
public void killFlashlight() {
boolean enabled;
synchronized (this) {
enabled = mFlashlightEnabled;
}
if (enabled) {
mHandler.post(mKillFlashlightRunnable);
}
}
public synchronized boolean isAvailable() {
return mCameraAvailable;
}
public void addListener(FlashlightListener l) {
synchronized (mListeners) {
cleanUpListenersLocked(l);
mListeners.add(new WeakReference<>(l));
}
}
public void removeListener(FlashlightListener l) {
synchronized (mListeners) {
cleanUpListenersLocked(l);
}
}
private synchronized void ensureHandler() {
if (mHandler == null) {
HandlerThread thread = new HandlerThread(TAG, Process.THREAD_PRIORITY_BACKGROUND);
thread.start();
mHandler = new Handler(thread.getLooper());
}
}
private void startDevice() throws CameraAccessException {
mCameraManager.openCamera(getCameraId(), mCameraListener, mHandler);
}
private void startSession() throws CameraAccessException {
mSurfaceTexture = new SurfaceTexture(false);
Size size = getSmallestSize(mCameraDevice.getId());
mSurfaceTexture.setDefaultBufferSize(size.getWidth(), size.getHeight());
mSurface = new Surface(mSurfaceTexture);
ArrayList<Surface> outputs = new ArrayList<>(1);
outputs.add(mSurface);
mCameraDevice.createCaptureSession(outputs, mSessionListener, mHandler);
}
private Size getSmallestSize(String cameraId) throws CameraAccessException {
Size[] outputSizes = mCameraManager.getCameraCharacteristics(cameraId)
.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP)
.getOutputSizes(SurfaceTexture.class);
if (outputSizes == null || outputSizes.length == 0) {
throw new IllegalStateException(
"Camera " + cameraId + "doesn't support any outputSize.");
}
Size chosen = outputSizes[0];
for (Size s : outputSizes) {
if (chosen.getWidth() >= s.getWidth() && chosen.getHeight() >= s.getHeight()) {
chosen = s;
}
}
return chosen;
}
private void postUpdateFlashlight() {
ensureHandler();
mHandler.post(mUpdateFlashlightRunnable);
}
private String getCameraId() throws CameraAccessException {
String[] ids = mCameraManager.getCameraIdList();
for (String id : ids) {
CameraCharacteristics c = mCameraManager.getCameraCharacteristics(id);
Boolean flashAvailable = c.get(CameraCharacteristics.FLASH_INFO_AVAILABLE);
Integer lensFacing = c.get(CameraCharacteristics.LENS_FACING);
if (flashAvailable != null && flashAvailable
&& lensFacing != null && lensFacing == CameraCharacteristics.LENS_FACING_BACK) {
return id;
}
}
return null;
}
private void updateFlashlight(boolean forceDisable) {
try {
boolean enabled;
synchronized (this) {
enabled = mFlashlightEnabled && !forceDisable;
}
if (enabled) {
if (mCameraDevice == null) {
startDevice();
return;
}
if (mSession == null) {
startSession();
return;
}
if (mFlashlightRequest == null) {
CaptureRequest.Builder builder = mCameraDevice.createCaptureRequest(
CameraDevice.TEMPLATE_PREVIEW);
builder.set(CaptureRequest.FLASH_MODE, CameraMetadata.FLASH_MODE_TORCH);
builder.addTarget(mSurface);
CaptureRequest request = builder.build();
mSession.capture(request, null, mHandler);
mFlashlightRequest = request;
}
} else {
if (mCameraDevice != null) {
mCameraDevice.close();
teardown();
}
}
} catch (CameraAccessException|IllegalStateException|UnsupportedOperationException e) {
Log.e(TAG, "Error in updateFlashlight", e);
handleError();
}
}
private void teardown() {
mCameraDevice = null;
mSession = null;
mFlashlightRequest = null;
if (mSurface != null) {
mSurface.release();
mSurfaceTexture.release();
}
mSurface = null;
mSurfaceTexture = null;
}
private void handleError() {
synchronized (this) {
mFlashlightEnabled = false;
}
dispatchError();
dispatchOff();
updateFlashlight(true /* forceDisable */);
}
private void dispatchOff() {
dispatchListeners(DISPATCH_OFF, false /* argument (ignored) */);
}
private void dispatchError() {
dispatchListeners(DISPATCH_ERROR, false /* argument (ignored) */);
}
private void dispatchAvailabilityChanged(boolean available) {
dispatchListeners(DISPATCH_AVAILABILITY_CHANGED, available);
}
private void dispatchListeners(int message, boolean argument) {
synchronized (mListeners) {
final int N = mListeners.size();
boolean cleanup = false;
for (int i = 0; i < N; i++) {
FlashlightListener l = mListeners.get(i).get();
if (l != null) {
if (message == DISPATCH_ERROR) {
l.onFlashlightError();
} else if (message == DISPATCH_OFF) {
l.onFlashlightOff();
} else if (message == DISPATCH_AVAILABILITY_CHANGED) {
l.onFlashlightAvailabilityChanged(argument);
}
} else {
cleanup = true;
}
}
if (cleanup) {
cleanUpListenersLocked(null);
}
}
}
private void cleanUpListenersLocked(FlashlightListener listener) {
for (int i = mListeners.size() - 1; i >= 0; i--) {
FlashlightListener found = mListeners.get(i).get();
if (found == null || found == listener) {
mListeners.remove(i);
}
}
}
private final CameraDevice.StateListener mCameraListener = new CameraDevice.StateListener() {
@Override
public void onOpened(CameraDevice camera) {
mCameraDevice = camera;
postUpdateFlashlight();
}
@Override
public void onDisconnected(CameraDevice camera) {
if (mCameraDevice == camera) {
dispatchOff();
teardown();
}
}
@Override
public void onError(CameraDevice camera, int error) {
Log.e(TAG, "Camera error: camera=" + camera + " error=" + error);
if (camera == mCameraDevice || mCameraDevice == null) {
handleError();
}
}
};
private final CameraCaptureSession.StateListener mSessionListener =
new CameraCaptureSession.StateListener() {
@Override
public void onConfigured(CameraCaptureSession session) {
if (session.getDevice() == mCameraDevice) {
mSession = session;
} else {
session.close();
}
postUpdateFlashlight();
}
@Override
public void onConfigureFailed(CameraCaptureSession session) {
Log.e(TAG, "Configure failed.");
if (mSession == null || mSession == session) {
handleError();
}
}
};
private final Runnable mUpdateFlashlightRunnable = new Runnable() {
@Override
public void run() {
updateFlashlight(false /* forceDisable */);
}
};
private final Runnable mKillFlashlightRunnable = new Runnable() {
@Override
public void run() {
synchronized (this) {
mFlashlightEnabled = false;
}
updateFlashlight(true /* forceDisable */);
dispatchOff();
}
};
private final CameraManager.AvailabilityCallback mAvailabilityCallback =
new CameraManager.AvailabilityCallback() {
@Override
public void onCameraAvailable(String cameraId) {
if (DEBUG) Log.d(TAG, "onCameraAvailable(" + cameraId + ")");
if (cameraId.equals(mCameraId)) {
setCameraAvailable(true);
}
}
@Override
public void onCameraUnavailable(String cameraId) {
if (DEBUG) Log.d(TAG, "onCameraUnavailable(" + cameraId + ")");
if (cameraId.equals(mCameraId)) {
setCameraAvailable(false);
}
}
private void setCameraAvailable(boolean available) {
boolean changed;
synchronized (FlashlightController.this) {
changed = mCameraAvailable != available;
mCameraAvailable = available;
}
if (changed) {
if (DEBUG) Log.d(TAG, "dispatchAvailabilityChanged(" + available + ")");
dispatchAvailabilityChanged(available);
}
}
};
public interface FlashlightListener {
/**
* Called when the flashlight turns off unexpectedly.
*/
void onFlashlightOff();
/**
* Called when there is an error that turns the flashlight off.
*/
void onFlashlightError();
/**
* Called when there is a change in availability of the flashlight functionality
* @param available true if the flashlight is currently available.
*/
void onFlashlightAvailabilityChanged(boolean available);
}
}
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