| /* |
| * Copyright (C) 2021 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.car.evs; |
| |
| import static android.car.evs.CarEvsManager.ERROR_BUSY; |
| import static android.car.evs.CarEvsManager.ERROR_NONE; |
| import static android.car.evs.CarEvsManager.ERROR_UNAVAILABLE; |
| import static android.car.evs.CarEvsManager.SERVICE_STATE_ACTIVE; |
| import static android.car.evs.CarEvsManager.SERVICE_STATE_INACTIVE; |
| import static android.car.evs.CarEvsManager.SERVICE_STATE_REQUESTED; |
| import static android.car.evs.CarEvsManager.SERVICE_STATE_UNAVAILABLE; |
| import static android.car.evs.CarEvsManager.STREAM_EVENT_STREAM_STOPPED; |
| |
| import static com.android.car.CarLog.TAG_EVS; |
| |
| import android.annotation.NonNull; |
| import android.annotation.Nullable; |
| import android.car.Car; |
| import android.car.builtin.os.PackageManagerHelper; |
| import android.car.builtin.util.Slog; |
| import android.car.evs.CarEvsBufferDescriptor; |
| import android.car.evs.CarEvsManager; |
| import android.car.evs.CarEvsManager.CarEvsError; |
| import android.car.evs.CarEvsManager.CarEvsServiceState; |
| import android.car.evs.CarEvsManager.CarEvsServiceType; |
| import android.car.evs.CarEvsManager.CarEvsStreamEvent; |
| import android.car.evs.CarEvsStatus; |
| import android.car.evs.ICarEvsStatusListener; |
| import android.car.evs.ICarEvsStreamCallback; |
| import android.car.hardware.CarPropertyValue; |
| import android.car.hardware.property.CarPropertyEvent; |
| import android.car.hardware.property.ICarPropertyEventListener; |
| import android.content.ComponentName; |
| import android.content.Context; |
| import android.content.Intent; |
| import android.content.pm.PackageManager.NameNotFoundException; |
| import android.hardware.HardwareBuffer; |
| import android.hardware.automotive.vehicle.V2_0.VehicleArea; |
| import android.hardware.automotive.vehicle.V2_0.VehicleGear; |
| import android.hardware.automotive.vehicle.V2_0.VehicleProperty; |
| import android.os.Binder; |
| import android.os.Build; |
| import android.os.Handler; |
| import android.os.IBinder; |
| import android.os.Looper; |
| import android.os.RemoteCallbackList; |
| import android.os.RemoteException; |
| import android.os.SystemClock; |
| import android.os.UserHandle; |
| import android.util.ArraySet; |
| import android.util.Log; |
| |
| import com.android.car.CarPropertyService; |
| import com.android.car.CarServiceBase; |
| import com.android.car.CarServiceUtils; |
| import com.android.car.R; |
| import com.android.car.hal.EvsHalService; |
| import com.android.car.internal.util.IndentingPrintWriter; |
| import com.android.internal.annotations.GuardedBy; |
| |
| import java.lang.ref.WeakReference; |
| import java.util.List; |
| import java.util.Objects; |
| import java.util.concurrent.CountDownLatch; |
| |
| /** |
| * A service that listens to the Extended View System across a HAL boundary and exposes the data to |
| * system clients in Android via {@link android.car.evs.CarEvsManager}. |
| * |
| * Because of Fast Message Queue usages, android.hardware.automotive.evs@1.1 interfaces does not |
| * support Java backend and, therefore, actual API calls are done in native methods. |
| * |
| * |
| * CarEvsService consists of four states: |
| * |
| * UNAVAILABLE: CarEvsService is not connected to the Extended View System service. In this |
| * state, any service request will be declined. |
| * |
| * INACTIVE: CarEvsService has a valid, live connection the Extended View System service and |
| * ready for any service requests. |
| * |
| * REQUESTED: CarEvsService received a service requeste from a privileged client and requested |
| * the System UI to launch the camera viewing activity. |
| * |
| * ACTIVE: CarEvsService is actively streaming a video to the client. |
| * |
| * See CarEvsService.StateMachine class for more details. |
| */ |
| public final class CarEvsService extends android.car.evs.ICarEvsService.Stub |
| implements CarServiceBase, EvsHalService.EvsHalEventListener { |
| |
| private static final boolean DBG = Log.isLoggable(TAG_EVS, Log.DEBUG); |
| |
| // Integer value to indicate no buffer with a given id exists |
| private static final int BUFFER_NOT_EXIST = -1; |
| |
| // Timeout for a stream-stopped confirmation |
| private static final int STREAM_STOPPED_WAIT_TIMEOUT_MS = 500; |
| |
| // Timeout for a request to start a video stream with a valid token |
| private static final int STREAM_START_REQUEST_TIMEOUT_MS = 3000; |
| |
| // Interval for connecting to the EVS HAL service trial |
| private static final long EVS_HAL_SERVICE_BIND_RETRY_INTERVAL_MS = 1000; |
| |
| // Service request priorities |
| private static final int REQUEST_PRIORITY_HIGH = 0; |
| private static final int REQUEST_PRIORITY_NORMAL = 1; |
| private static final int REQUEST_PRIORITY_LOW = 2; |
| |
| private static final class EvsHalEvent { |
| private long mTimestamp; |
| private int mServiceType; |
| private boolean mOn; |
| |
| public EvsHalEvent(long timestamp, @CarEvsServiceType int type, boolean on) { |
| mTimestamp = timestamp; |
| mServiceType = type; |
| mOn = on; |
| } |
| |
| public long getTimestamp() { |
| return mTimestamp; |
| } |
| |
| public @CarEvsServiceType int getServiceType() { |
| return mServiceType; |
| } |
| |
| public boolean isRequestingToStartActivity() { |
| return mOn; |
| } |
| |
| public String toString() { |
| return "ServiceType = " + mServiceType + ", mOn = " + mOn + |
| ", Timestamp = " + mTimestamp; |
| } |
| } |
| |
| private static final String COMMAND_TO_USE_DEFAULT_CAMERA = "default"; |
| |
| private final Context mContext; |
| private final EvsHalService mEvsHalService; |
| private final CarPropertyService mPropertyService; |
| private final Object mLock = new Object(); |
| |
| private final ComponentName mEvsCameraActivity; |
| |
| // This handler is to monitor the client sends a video stream request within a given time |
| // after a state transition to the REQUESTED state. |
| private final Handler mHandler = new Handler(Looper.getMainLooper()); |
| |
| // Bookkeeps received frame buffers |
| private final ArraySet mBufferRecords = new ArraySet(); |
| |
| private final class StatusListenerList extends RemoteCallbackList<ICarEvsStatusListener> { |
| private final WeakReference<CarEvsService> mService; |
| |
| StatusListenerList(CarEvsService evsService) { |
| mService = new WeakReference<>(evsService); |
| } |
| |
| /** Handle callback death */ |
| @Override |
| public void onCallbackDied(ICarEvsStatusListener listener) { |
| Slog.w(TAG_EVS, "StatusListener has died: " + listener.asBinder()); |
| |
| CarEvsService svc = mService.get(); |
| if (svc != null) { |
| svc.handleClientDisconnected(listener); |
| } |
| } |
| } |
| |
| private final StatusListenerList mStatusListeners = new StatusListenerList(this); |
| |
| private final IBinder.DeathRecipient mStreamCallbackDeathRecipient = |
| new IBinder.DeathRecipient() { |
| @Override |
| public void binderDied() { |
| Slog.w(TAG_EVS, "StreamCallback has died"); |
| synchronized (mLock) { |
| if (requestActivityIfNecessaryLocked()) { |
| Slog.i(TAG_EVS, "Requested to launch the activity."); |
| } else { |
| // Ensure we stops streaming |
| mStateEngine.execute(REQUEST_PRIORITY_HIGH, SERVICE_STATE_INACTIVE); |
| } |
| } |
| } |
| }; |
| |
| /** |
| * {@link CarPropertyEvent} listener registered with {@link CarPropertyService} to listen to |
| * {@link VehicleProperty.GEAR_SELECTION} change notifications. |
| */ |
| private final ICarPropertyEventListener mGearSelectionPropertyListener = |
| new ICarPropertyEventListener.Stub() { |
| @Override |
| public void onEvent(List<CarPropertyEvent> events) throws RemoteException { |
| synchronized (mLock) { |
| // Handle only the latest event |
| Slog.e(TAG_EVS, "Handling GearSelection"); |
| handlePropertyEventLocked(events.get(events.size() - 1)); |
| } |
| } |
| }; |
| |
| private final Runnable mActivityRequestTimeoutRunnable = () -> handleActivityRequestTimeout(); |
| |
| // CarEvsService state machine implementation to handle all state transitions. |
| private final class StateMachine { |
| // Current state |
| @GuardedBy("mLock") |
| private int mState = SERVICE_STATE_UNAVAILABLE; |
| |
| // Current service type |
| @GuardedBy("mLock") |
| private int mServiceType = CarEvsManager.SERVICE_TYPE_REARVIEW; |
| |
| // Priority of a last service request |
| @GuardedBy("mLock") |
| private int mLastRequestPriority = REQUEST_PRIORITY_LOW; |
| |
| public @CarEvsError int execute(int priority, int destination) { |
| int serviceType; |
| synchronized (mLock) { |
| serviceType = mServiceType; |
| } |
| return execute(priority, destination, serviceType, null, null); |
| } |
| |
| public @CarEvsError int execute(int priority, int destination, int service) { |
| return execute(priority, destination, service, null, null); |
| } |
| |
| public @CarEvsError int execute(int priority, int destination, |
| ICarEvsStreamCallback callback) { |
| int serviceType; |
| synchronized (mLock) { |
| serviceType = mServiceType; |
| } |
| return execute(priority, destination, serviceType, null, callback); |
| } |
| |
| public @CarEvsError int execute(int priority, int destination, int service, IBinder token, |
| ICarEvsStreamCallback callback) { |
| |
| int serviceType; |
| int newState; |
| int result = ERROR_NONE; |
| synchronized (mLock) { |
| // TODO(b/188970686): Reduce this lock duration. |
| if (mState == destination && destination != SERVICE_STATE_REQUESTED) { |
| // Nothing to do |
| return ERROR_NONE; |
| } |
| |
| int previousState = mState; |
| Slog.d(TAG_EVS, "Transition requested: " + toString(previousState) + |
| " -> " + toString(destination)); |
| |
| switch (destination) { |
| case SERVICE_STATE_UNAVAILABLE: |
| result = handleTransitionToUnavailableLocked(); |
| break; |
| |
| case SERVICE_STATE_INACTIVE: |
| result = handleTransitionToInactiveLocked(priority, service, callback); |
| break; |
| |
| case SERVICE_STATE_REQUESTED: |
| result = handleTransitionToRequestedLocked(priority, service); |
| break; |
| |
| case SERVICE_STATE_ACTIVE: |
| result = handleTransitionToActiveLocked(priority, service, token, callback); |
| break; |
| |
| default: |
| throw new IllegalStateException( |
| "CarEvsService is in the unknown state, " + previousState); |
| } |
| |
| serviceType = mServiceType; |
| newState = mState; |
| } |
| |
| if (result == ERROR_NONE) { |
| // Broadcasts current state |
| broadcastStateTransition(serviceType, newState); |
| } |
| |
| return result; |
| } |
| |
| public @CarEvsServiceState int getState() { |
| synchronized (mLock) { |
| return mState; |
| } |
| } |
| |
| public @CarEvsServiceType int getServiceType() { |
| synchronized (mLock) { |
| return mServiceType; |
| } |
| } |
| |
| public CarEvsStatus getStateAndServiceType() { |
| synchronized (mLock) { |
| return new CarEvsStatus(mServiceType, mState); |
| } |
| } |
| |
| public boolean checkCurrentStateRequiresActivity() { |
| synchronized (mLock) { |
| return mState == SERVICE_STATE_ACTIVE || mState == SERVICE_STATE_REQUESTED; |
| } |
| } |
| |
| |
| @GuardedBy("mLock") |
| private @CarEvsError int handleTransitionToUnavailableLocked() { |
| // This transition happens only when CarEvsService loses the active connection to the |
| // Extended View System service. |
| switch (mState) { |
| case SERVICE_STATE_UNAVAILABLE: |
| // Nothing to do |
| break; |
| |
| default: |
| // Stops any active video stream |
| stopService(); |
| break; |
| } |
| |
| mState = SERVICE_STATE_UNAVAILABLE; |
| return ERROR_NONE; |
| } |
| |
| @GuardedBy("mLock") |
| private @CarEvsError int handleTransitionToInactiveLocked(int priority, int service, |
| ICarEvsStreamCallback callback) { |
| |
| switch (mState) { |
| case SERVICE_STATE_UNAVAILABLE: |
| if (callback != null) { |
| // We get a request to stop a video stream after losing a native EVS |
| // service. Simply unregister a callback and return. |
| unlinkToDeathStreamCallbackLocked(); |
| mStreamCallback = null; |
| return ERROR_NONE; |
| } else { |
| // Requested to connect to the Extended View System service |
| if (!nativeConnectToHalServiceIfNecessary(mNativeEvsServiceObj)) { |
| return ERROR_UNAVAILABLE; |
| } |
| } |
| break; |
| |
| case SERVICE_STATE_INACTIVE: |
| // Nothing to do |
| break; |
| |
| case SERVICE_STATE_REQUESTED: |
| // Requested to cancel a pending service request |
| if (mServiceType != service || mLastRequestPriority > priority) { |
| return ERROR_BUSY; |
| } |
| |
| // Reset a timer for this new request |
| mHandler.removeCallbacks(mActivityRequestTimeoutRunnable); |
| break; |
| |
| case SERVICE_STATE_ACTIVE: |
| // Requested to stop a current video stream |
| if (mServiceType != service || mLastRequestPriority > priority) { |
| return ERROR_BUSY; |
| } |
| |
| if (callback != null) { |
| stopVideoStreamAndUnregisterCallback(callback); |
| } else { |
| stopService(); |
| } |
| break; |
| |
| default: |
| throw new IllegalStateException("CarEvsService is in the unknown state."); |
| } |
| |
| mState = SERVICE_STATE_INACTIVE; |
| setSessionToken(null); |
| return ERROR_NONE; |
| } |
| |
| @GuardedBy("mLock") |
| private @CarEvsError int handleTransitionToRequestedLocked(int priority, int service) { |
| switch (mState) { |
| case SERVICE_STATE_UNAVAILABLE: |
| // Attempts to connect to the native EVS service and transits to the |
| // REQUESTED state if it succeeds. |
| if (!nativeConnectToHalServiceIfNecessary(mNativeEvsServiceObj)) { |
| return ERROR_UNAVAILABLE; |
| } |
| break; |
| |
| case SERVICE_STATE_INACTIVE: |
| // Nothing to do |
| break; |
| |
| case SERVICE_STATE_REQUESTED: |
| if (priority > mLastRequestPriority) { |
| // A current service request has a lower priority than a previous |
| // service request. |
| Slog.e(TAG_EVS, |
| "CarEvsService is busy with a higher priority client."); |
| return ERROR_BUSY; |
| } |
| |
| // Reset a timer for this new request |
| mHandler.removeCallbacks(mActivityRequestTimeoutRunnable); |
| break; |
| |
| case SERVICE_STATE_ACTIVE: |
| if (priority > mLastRequestPriority) { |
| // We decline a request because CarEvsService is busy with a higher priority |
| // client. |
| return ERROR_BUSY; |
| } else if (priority == mLastRequestPriority) { |
| // We do not need to transit to the REQUESTED state because CarEvsService |
| // was transited to the ACTIVE state by a request that has the same priority |
| // with current request. |
| return ERROR_NONE; |
| } else { |
| // Stop stream on all lower priority clients. |
| processStreamEvent(STREAM_EVENT_STREAM_STOPPED); |
| } |
| break; |
| |
| default: |
| throw new IllegalStateException("CarEvsService is in the unknown state."); |
| } |
| |
| // Arms the timer |
| mHandler.postDelayed(mActivityRequestTimeoutRunnable, STREAM_START_REQUEST_TIMEOUT_MS); |
| |
| mState = SERVICE_STATE_REQUESTED; |
| mServiceType = service; |
| mLastRequestPriority = priority; |
| |
| if (mEvsCameraActivity != null) { |
| Intent evsIntent = new Intent(Intent.ACTION_MAIN) |
| .setComponent(mEvsCameraActivity) |
| .addFlags(Intent.FLAG_ACTIVITY_NEW_TASK) |
| .addFlags(Intent.FLAG_ACTIVITY_NEW_DOCUMENT) |
| .addFlags(Intent.FLAG_ACTIVITY_MULTIPLE_TASK) |
| .addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION); |
| if (priority == REQUEST_PRIORITY_HIGH) { |
| mSessionToken = new Binder(); |
| evsIntent.putExtra(CarEvsManager.EXTRA_SESSION_TOKEN, mSessionToken); |
| } |
| mContext.startActivity(evsIntent); |
| } |
| return ERROR_NONE; |
| } |
| |
| @GuardedBy("mLock") |
| private @CarEvsError int handleTransitionToActiveLocked(int priority, int service, |
| IBinder token, ICarEvsStreamCallback callback) { |
| |
| @CarEvsError int result = ERROR_NONE; |
| switch (mState) { |
| case SERVICE_STATE_UNAVAILABLE: |
| // We do not have a valid connection to the Extended View System service. |
| return ERROR_UNAVAILABLE; |
| |
| case SERVICE_STATE_INACTIVE: |
| // CarEvsService receives a low priority request to start a video stream. |
| result = startServiceAndVideoStream(service, callback); |
| if (result != ERROR_NONE) { |
| return result; |
| } |
| break; |
| |
| case SERVICE_STATE_REQUESTED: |
| // CarEvsService is reserved for higher priority clients. |
| if (priority == REQUEST_PRIORITY_HIGH && !isSessionToken(token)) { |
| // Declines a request with an expired token. |
| return ERROR_BUSY; |
| } |
| |
| result = startServiceAndVideoStream(service, callback); |
| if (result != ERROR_NONE) { |
| return result; |
| } |
| break; |
| |
| case SERVICE_STATE_ACTIVE: |
| // CarEvsManager will transfer an active video stream to a new client with a |
| // higher or equal priority. |
| if (priority > mLastRequestPriority) { |
| Slog.i(TAG_EVS, "Declines a service request with a lower priority."); |
| break; |
| } |
| |
| if (mStreamCallback != null) { |
| // keep old reference for Runnable. |
| ICarEvsStreamCallback previousCallback = mStreamCallback; |
| mHandler.post(() -> notifyStreamStopped(previousCallback)); |
| } |
| |
| mStreamCallback = callback; |
| break; |
| |
| default: |
| throw new IllegalStateException("CarEvsService is in the unknown state."); |
| } |
| |
| mState = SERVICE_STATE_ACTIVE; |
| mServiceType = service; |
| mLastRequestPriority = priority; |
| return ERROR_NONE; |
| } |
| |
| private String toString(@CarEvsServiceState int state) { |
| switch (state) { |
| case SERVICE_STATE_UNAVAILABLE: |
| return "UNAVAILABLE"; |
| case SERVICE_STATE_INACTIVE: |
| return "INACTIVE"; |
| case SERVICE_STATE_REQUESTED: |
| return "REQUESTED"; |
| case SERVICE_STATE_ACTIVE: |
| return "ACTIVE"; |
| default: |
| return "UNKNOWN"; |
| } |
| } |
| |
| public String toString() { |
| synchronized (mLock) { |
| return toString(mState); |
| } |
| } |
| } |
| |
| private final StateMachine mStateEngine = new StateMachine(); |
| |
| @GuardedBy("mLock") |
| private ICarEvsStreamCallback mStreamCallback = null; |
| |
| // The latest session token issued to the privileged clients |
| @GuardedBy("mLock") |
| private IBinder mSessionToken = null; |
| |
| // This boolean flag is true if CarEvsService uses GEAR_SELECTION VHAL property instead of |
| // EVS_SERVICE_REQUEST. |
| private boolean mUseGearSelection = true; |
| |
| // When this is set, CarEvsService will attempt to open a camera device the user sets. |
| private boolean mUseCameraIdOverride = false; |
| |
| // This is a device name to be used when mUseCameraIdOverride is true. |
| private String mCameraIdOverride; |
| |
| private void setSessionToken(IBinder token) { |
| synchronized (mLock) { |
| mSessionToken = token; |
| } |
| } |
| |
| private boolean isSessionToken(IBinder token) { |
| synchronized (mLock) { |
| return token != null && token == mSessionToken; |
| } |
| } |
| |
| // Synchronization object for a stream-stopped confirmation |
| private CountDownLatch mStreamStoppedEvent = new CountDownLatch(0); |
| |
| // The last event EvsHalService reported. This will be set to null when a related service |
| // request is handled. |
| @GuardedBy("mLock") |
| private EvsHalEvent mLastEvsHalEvent = new EvsHalEvent(SystemClock.elapsedRealtimeNanos(), |
| CarEvsManager.SERVICE_TYPE_REARVIEW, /* on = */false); |
| |
| // Stops a current video stream and unregisters a callback |
| private void stopVideoStreamAndUnregisterCallback(ICarEvsStreamCallback callback) { |
| synchronized (mLock) { |
| if (callback.asBinder() != mStreamCallback.asBinder()) { |
| Slog.i(TAG_EVS, "Declines a request to stop a video not from a current client."); |
| return; |
| } |
| |
| // Notify the client that the stream has ended. |
| notifyStreamStopped(callback); |
| |
| unlinkToDeathStreamCallbackLocked(); |
| mStreamCallback = null; |
| Slog.i(TAG_EVS, "Last stream client has been disconnected."); |
| nativeRequestToStopVideoStream(mNativeEvsServiceObj); |
| } |
| } |
| |
| // Starts a service and its video stream |
| @GuardedBy("mLock") |
| private @CarEvsError int startServiceAndVideoStream( |
| @CarEvsServiceType int service, ICarEvsStreamCallback callback) { |
| if (!startService(service)) { |
| return ERROR_UNAVAILABLE; |
| } |
| |
| mStreamCallback = callback; |
| linkToDeathStreamCallbackLocked(); |
| |
| if (!nativeRequestToStartVideoStream(mNativeEvsServiceObj)) { |
| Slog.e(TAG_EVS, "Failed to start a video stream"); |
| mStreamCallback = null; |
| return ERROR_UNAVAILABLE; |
| } |
| |
| return ERROR_NONE; |
| } |
| |
| @GuardedBy("mLock") |
| private boolean requestActivityIfNecessaryLocked() { |
| if (!mStateEngine.checkCurrentStateRequiresActivity() || mLastEvsHalEvent == null |
| || !mLastEvsHalEvent.isRequestingToStartActivity()) { |
| return false; |
| } |
| |
| // Request to launch an activity again after cleaning up |
| mStateEngine.execute(REQUEST_PRIORITY_HIGH, SERVICE_STATE_INACTIVE); |
| mStateEngine.execute(REQUEST_PRIORITY_HIGH, SERVICE_STATE_REQUESTED, |
| mLastEvsHalEvent.getServiceType()); |
| return true; |
| } |
| |
| // Waits for a video stream request from the System UI with a valid token. |
| private void handleActivityRequestTimeout() { |
| synchronized (mLock) { |
| // No client has responded to a state transition to the REQUESTED |
| // state before the timer expires. CarEvsService sends a |
| // notification again if it's still needed. |
| if (requestActivityIfNecessaryLocked()) { |
| Slog.w(TAG_EVS, "Timer expired. Request to launch the activity again."); |
| return; |
| } else if (mStateEngine.getState() == SERVICE_STATE_REQUESTED) { |
| // If the service is no longer required by other services, we transit to |
| // the INACTIVE state. |
| mStateEngine.execute(REQUEST_PRIORITY_HIGH, SERVICE_STATE_INACTIVE); |
| } |
| } |
| } |
| |
| @GuardedBy("mLock") |
| private void linkToDeathStreamCallbackLocked() { |
| IBinder binder; |
| if (mStreamCallback == null) { |
| return; |
| } |
| |
| binder = mStreamCallback.asBinder(); |
| if (binder == null) { |
| Slog.w(TAG_EVS, "Linking to a binder death recipient skipped"); |
| return; |
| } |
| |
| try { |
| binder.linkToDeath(mStreamCallbackDeathRecipient, 0); |
| } catch (RemoteException e) { |
| Slog.w(TAG_EVS, "Failed to link a binder death recipient: " + e); |
| } |
| } |
| |
| @GuardedBy("mLock") |
| private void unlinkToDeathStreamCallbackLocked() { |
| IBinder binder; |
| if (mStreamCallback == null) { |
| return; |
| } |
| |
| binder = mStreamCallback.asBinder(); |
| if (binder == null) { |
| return; |
| } |
| |
| binder.unlinkToDeath(mStreamCallbackDeathRecipient, 0); |
| } |
| |
| /** Creates an Extended View System service instance given a {@link Context}. */ |
| public CarEvsService(Context context, EvsHalService halService, |
| CarPropertyService propertyService) { |
| mContext = context; |
| mPropertyService = propertyService; |
| mEvsHalService = halService; |
| |
| String activityName = mContext.getResources().getString(R.string.config_evsCameraActivity); |
| if (!activityName.isEmpty()) { |
| mEvsCameraActivity = ComponentName.unflattenFromString(activityName); |
| } else { |
| mEvsCameraActivity = null; |
| } |
| if (DBG) Slog.d(TAG_EVS, "evsCameraActivity=" + mEvsCameraActivity); |
| } |
| |
| /** Implements EvsHalService.EvsHalEventListener to monitor VHAL properties. */ |
| @Override |
| public void onEvent(@CarEvsServiceType int type, boolean on) { |
| if (DBG) { |
| Slog.d(TAG_EVS, |
| "Received an event from EVS HAL: type = " + type + ", on = " + on); |
| } |
| |
| synchronized (mLock) { |
| int targetState = on ? SERVICE_STATE_REQUESTED : SERVICE_STATE_INACTIVE; |
| if (mStateEngine.execute(REQUEST_PRIORITY_HIGH, targetState, type, /* token = */ null, |
| mStreamCallback) != ERROR_NONE) { |
| Slog.e(TAG_EVS, "Failed to execute a service request."); |
| } |
| |
| // Stores the last event |
| mLastEvsHalEvent = new EvsHalEvent(SystemClock.elapsedRealtimeNanos(), type, on); |
| } |
| } |
| |
| @Override |
| public void init() { |
| if (DBG) { |
| Slog.d(TAG_EVS, "Initializing the service"); |
| } |
| |
| if (mEvsHalService.isEvsServiceRequestSupported()) { |
| try { |
| mEvsHalService.setListener(this); |
| if (DBG) { |
| Slog.d(TAG_EVS, "CarEvsService listens to EVS_SERVICE_REQUEST property."); |
| } |
| mUseGearSelection = false; |
| } catch (IllegalStateException e) { |
| Slog.w(TAG_EVS, |
| "Failed to set a EvsHalService listener. Try to use GEAR_SELECTION."); |
| } |
| } |
| |
| if (mUseGearSelection) { |
| if (DBG) { |
| Slog.d(TAG_EVS, "CarEvsService listens to GEAR_SELECTION property."); |
| } |
| |
| if (mPropertyService == null || |
| mPropertyService.getProperty(VehicleProperty.GEAR_SELECTION, |
| VehicleArea.GLOBAL) == null) { |
| Slog.e(TAG_EVS, |
| "CarEvsService is disabled because GEAR_SELECTION is unavailable."); |
| mUseGearSelection = false; |
| return; |
| } |
| |
| mPropertyService.registerListener(VehicleProperty.GEAR_SELECTION, /*rate=*/0, |
| mGearSelectionPropertyListener); |
| } |
| |
| // Creates a handle to use the native Extended View System service |
| mNativeEvsServiceObj = CarEvsService.nativeCreateServiceHandle(); |
| |
| // Attempts to transit to the INACTIVE state |
| if (mNativeEvsServiceObj == 0 || |
| mStateEngine.execute(REQUEST_PRIORITY_HIGH, SERVICE_STATE_INACTIVE) != ERROR_NONE) { |
| Slog.e(TAG_EVS, "Failed to create a service handle or transit to the INACTIVE state,"); |
| CarEvsService.nativeDestroyServiceHandle(mNativeEvsServiceObj); |
| mNativeEvsServiceObj = 0; |
| |
| if (mUseGearSelection && mPropertyService != null) { |
| if (DBG) { |
| Slog.d(TAG_EVS, "Unregister a property listener on init() failure."); |
| } |
| mPropertyService.unregisterListener(VehicleProperty.GEAR_SELECTION, |
| mGearSelectionPropertyListener); |
| } |
| } |
| } |
| |
| @Override |
| public void release() { |
| if (DBG) { |
| Slog.d(TAG_EVS, "Finalizing the service"); |
| } |
| |
| if (mUseGearSelection && mPropertyService != null) { |
| if (DBG) { |
| Slog.d(TAG_EVS, "Unregister a property listener in release()"); |
| } |
| mPropertyService.unregisterListener(VehicleProperty.GEAR_SELECTION, |
| mGearSelectionPropertyListener); |
| } |
| mStatusListeners.kill(); |
| |
| CarEvsService.nativeDestroyServiceHandle(mNativeEvsServiceObj); |
| mNativeEvsServiceObj = 0; |
| } |
| |
| @Override |
| public void dump(IndentingPrintWriter writer) { |
| writer.println("*CarEvsService*"); |
| writer.printf("Current state = %s\n", mStateEngine); |
| writer.printf("%s to HAL service\n", |
| mNativeEvsServiceObj == 0 ? "Not connected" : "Connected"); |
| |
| synchronized (mLock) { |
| writer.printf("Active stream client = %s\n", |
| mStreamCallback == null ? "null" : mStreamCallback.asBinder()); |
| writer.printf("%d service listeners subscribed.\n", |
| mStatusListeners.getRegisteredCallbackCount()); |
| writer.printf("Last HAL event = %s\n", mLastEvsHalEvent); |
| writer.printf("Current session token = %s\n", mSessionToken); |
| } |
| } |
| |
| /** |
| * Registers a {@link ICarEvsStatusListener} to listen requests to control the camera |
| * previewing activity. |
| * |
| * <p>Requires {@link android.car.Car.PERMISSION_MONITOR_CAR_EVS_STATUS} permissions to |
| * access. |
| * |
| * @param listener {@link ICarEvsStatusListener} listener to register. |
| */ |
| @Override |
| public void registerStatusListener(@NonNull ICarEvsStatusListener listener) { |
| CarServiceUtils.assertPermission(mContext, Car.PERMISSION_MONITOR_CAR_EVS_STATUS); |
| Objects.requireNonNull(listener); |
| |
| if (DBG) { |
| Slog.d(TAG_EVS, "Registering a new service listener"); |
| } |
| mStatusListeners.register(listener); |
| } |
| |
| /** |
| * Unregister the given {@link ICarEvsStatusListener} listener from receiving events. |
| * |
| * <p>Requires {@link android.car.Car.PERMISSION_MONITOR_CAR_EVS_STATUS} permissions to |
| * access. |
| * |
| * @param listener {@link ICarEvsStatusListener} listener to unregister. |
| */ |
| @Override |
| public void unregisterStatusListener(@NonNull ICarEvsStatusListener listener) { |
| CarServiceUtils.assertPermission(mContext, Car.PERMISSION_MONITOR_CAR_EVS_STATUS); |
| Objects.requireNonNull(listener); |
| |
| mStatusListeners.unregister(listener); |
| } |
| |
| /** |
| * Requests the system to start an activity to show the preview from a given EVS service type. |
| * |
| * <p>Requires {@link android.car.Car.PERMISSION_REQUEST_CAR_EVS_ACTIVITY} permissions to |
| * access. |
| * |
| * @param type {@link android.car.evs.CarEvsManager#CarEvsServiceType} |
| * @return {@link android.car.evs.CarEvsManager#CarEvsError} |
| */ |
| @Override |
| public @CarEvsError int startActivity(int type) { |
| CarServiceUtils.assertPermission(mContext, Car.PERMISSION_REQUEST_CAR_EVS_ACTIVITY); |
| |
| return mStateEngine.execute(REQUEST_PRIORITY_NORMAL, SERVICE_STATE_REQUESTED, type); |
| } |
| |
| /** |
| * Requests to stop a current previewing activity launched via {@link #startActivity}. |
| * |
| * <p>Requires {@link android.car.Car.PERMISSION_REQUEST_CAR_EVS_ACTIVITY} permissions to |
| * access. |
| */ |
| @Override |
| public void stopActivity() { |
| CarServiceUtils.assertPermission(mContext, Car.PERMISSION_REQUEST_CAR_EVS_ACTIVITY); |
| |
| mStateEngine.execute(REQUEST_PRIORITY_NORMAL, SERVICE_STATE_INACTIVE); |
| } |
| |
| /** |
| * Starts a video stream. |
| * |
| * <p>Requires {@link android.car.Car.PERMISSION_USE_CAR_EVS_CAMERA} permissions to access. |
| * |
| * @param type {@link android.car.evs.CarEvsManager#CarEvsServiceType} |
| * @param token IBinder object as a session token. If this is not null, CarEvsService handles a |
| * coming client as a privileged client. |
| * @param callback {@link ICarEvsStreamCallback} listener to register. |
| * @return {@link android.car.evs.CarEvsManager.CarEvsError} |
| */ |
| @Override |
| public @CarEvsError int startVideoStream(@CarEvsServiceType int type, @Nullable IBinder token, |
| @NonNull ICarEvsStreamCallback callback) { |
| CarServiceUtils.assertPermission(mContext, Car.PERMISSION_USE_CAR_EVS_CAMERA); |
| Objects.requireNonNull(callback); |
| |
| if (isSessionToken(token)) { |
| mHandler.removeCallbacks(mActivityRequestTimeoutRunnable); |
| } |
| |
| final int priority = token != null ? REQUEST_PRIORITY_HIGH : REQUEST_PRIORITY_LOW; |
| return mStateEngine.execute(priority, SERVICE_STATE_ACTIVE, type, token, callback); |
| } |
| |
| /** |
| * Requests to stop a video stream from the current service. |
| * |
| * <p>Requires {@link android.car.Car.PERMISSION_USE_CAR_EVS_CAMERA} permissions to access. |
| * |
| * @param callback {@link ICarEvsStreamCallback} listener to unregister. |
| */ |
| @Override |
| public void stopVideoStream(@NonNull ICarEvsStreamCallback callback) { |
| CarServiceUtils.assertPermission(mContext, Car.PERMISSION_USE_CAR_EVS_CAMERA); |
| Objects.requireNonNull(callback); |
| |
| synchronized (mLock) { |
| if (mStreamCallback == null || callback.asBinder() != mStreamCallback.asBinder()) { |
| Slog.i(TAG_EVS, "Ignores a video stream request not from current stream client."); |
| return; |
| } |
| } |
| |
| if (mStateEngine.execute(REQUEST_PRIORITY_HIGH, SERVICE_STATE_INACTIVE, callback) != |
| ERROR_NONE) { |
| Slog.w(TAG_EVS, "Failed to stop a video stream"); |
| |
| // We want to return if a video stop request fails. |
| return; |
| } |
| } |
| |
| /** |
| * Returns an used buffer to EVS service. |
| * |
| * <p>Requires {@link android.car.Car.PERMISSION_USE_CAR_EVS_CAMERA} permissions to access. |
| * |
| * @param bufferId An unique 32-bit integer identifier of the buffer to return. |
| * @throws IllegalArgumentException if a passed buffer has an unregistered identifier. |
| */ |
| @Override |
| public void returnFrameBuffer(int bufferId) { |
| CarServiceUtils.assertPermission(mContext, Car.PERMISSION_USE_CAR_EVS_CAMERA); |
| |
| boolean returnThisBuffer = false; |
| synchronized (mLock) { |
| if (!mBufferRecords.contains(bufferId)) { |
| Slog.w(TAG_EVS, |
| "Ignores a request to return a buffer with unknown id = " + bufferId); |
| return; |
| } |
| |
| mBufferRecords.remove(bufferId); |
| } |
| |
| // This may throw a NullPointerException if the native EVS service handle is invalid. |
| nativeDoneWithFrame(mNativeEvsServiceObj, bufferId); |
| } |
| |
| /** |
| * Returns a current status of CarEvsService. |
| * |
| * <p>Requires {@link android.car.Car.PERMISSION_MONITOR_CAR_EVS_STATUS} permissions to |
| * access. |
| * |
| * @return {@link android.car.evs.CarEvsStatus} |
| */ |
| @Override |
| @Nullable |
| public CarEvsStatus getCurrentStatus() { |
| CarServiceUtils.assertPermission(mContext, Car.PERMISSION_MONITOR_CAR_EVS_STATUS); |
| |
| return mStateEngine.getStateAndServiceType(); |
| } |
| |
| /** |
| * Returns a session token to be used to request the services. |
| * |
| * <p>Requires {@link android.car.Car.PERMISSION_CONTROL_CAR_EVS_ACTIVITY} permission to access. |
| * |
| * @return IBinder object as a session token. |
| * @throws IllegalStateException if we fail to find System UI package. |
| */ |
| @Override |
| public IBinder generateSessionToken() { |
| CarServiceUtils.assertPermission(mContext, Car.PERMISSION_CONTROL_CAR_EVS_ACTIVITY); |
| |
| String systemUiPackageName = PackageManagerHelper.getSystemUiPackageName(mContext); |
| IBinder token = new Binder(); |
| try { |
| int systemUiUid = mContext.getPackageManager().getPackageUidAsUser( |
| systemUiPackageName, UserHandle.USER_SYSTEM); |
| int callerUid = Binder.getCallingUid(); |
| if (systemUiUid == callerUid) { |
| setSessionToken(token); |
| } else { |
| throw new SecurityException("SystemUI only can generate SessionToken."); |
| } |
| } catch (NameNotFoundException err) { |
| throw new IllegalStateException(systemUiPackageName + " package not found."); |
| } finally { |
| return token; |
| } |
| } |
| |
| private void handleClientDisconnected(ICarEvsStatusListener listener) { |
| mStatusListeners.unregister(listener); |
| if (mStatusListeners.getRegisteredCallbackCount() == 0) { |
| Slog.d(TAG_EVS, "Last status listener has been disconnected."); |
| } |
| } |
| |
| /** |
| * Returns whether or not a given service type is supported. |
| * |
| * <p>Requires {@link android.car.Car.PERMISSION_MONITOR_CAR_EVS_STATUS} permissions to |
| * access. |
| */ |
| @Override |
| public boolean isSupported(@CarEvsServiceType int type) { |
| CarServiceUtils.assertPermission(mContext, Car.PERMISSION_MONITOR_CAR_EVS_STATUS); |
| |
| switch (type) { |
| case CarEvsManager.SERVICE_TYPE_REARVIEW: |
| // We store a handle to the native EVS service in mNativeEvsServiceObj variable. |
| return mNativeEvsServiceObj != 0; |
| |
| case CarEvsManager.SERVICE_TYPE_SURROUNDVIEW: |
| // TODO(b/179029031): Implements necessary logic when Surround View service is |
| // integrated. |
| return false; |
| |
| default: |
| throw new IllegalArgumentException("Unknown service type = " + type); |
| } |
| } |
| |
| /** |
| * Sets a camera device for the rearview. |
| * |
| * <p>Requires {@link android.car.Car.PERMISSION_USE_CAR_EVS_CAMERA} permissions to access. |
| * |
| * @param id A string identifier of a target camera device. |
| * @return This method return a false if this runs in a release build; otherwise, this returns |
| * true. |
| */ |
| public boolean setRearviewCameraIdFromCommand(@NonNull String id) { |
| CarServiceUtils.assertPermission(mContext, Car.PERMISSION_USE_CAR_EVS_CAMERA); |
| Objects.requireNonNull(id); |
| |
| if (!Build.IS_DEBUGGABLE) { |
| // This method is not allowed in the release build. |
| return false; |
| } |
| |
| if (id.equalsIgnoreCase(COMMAND_TO_USE_DEFAULT_CAMERA)) { |
| mUseCameraIdOverride = false; |
| Slog.i(TAG_EVS, "CarEvsService is set to use the default device for the rearview."); |
| } else { |
| mCameraIdOverride = id; |
| mUseCameraIdOverride = true; |
| Slog.i(TAG_EVS, "CarEvsService is set to use " + id + " for the rearview."); |
| } |
| |
| return true; |
| } |
| |
| /** |
| * Gets an identifier of a current camera device for the rearview. |
| * |
| * <p>Requires {@link android.car.Car.PERMISSION_MONITOR_CAR_EVS_STATUS} permissions to |
| * access. |
| * |
| * @return A string identifier of current rearview camera device. |
| */ |
| @NonNull |
| public String getRearviewCameraIdFromCommand() { |
| CarServiceUtils.assertPermission(mContext, Car.PERMISSION_MONITOR_CAR_EVS_STATUS); |
| if (mUseCameraIdOverride) { |
| return mCameraIdOverride; |
| } else { |
| return mContext.getString(R.string.config_evsRearviewCameraId); |
| } |
| } |
| |
| /** Handles client disconnections; may request to stop a video stream. */ |
| private void handleClientDisconnected(ICarEvsStreamCallback callback) { |
| // If the last stream client is disconnected before it stops a video stream, request to stop |
| // current video stream. |
| mStateEngine.execute(REQUEST_PRIORITY_HIGH, SERVICE_STATE_INACTIVE, callback); |
| } |
| |
| /** Notifies the service status gets changed */ |
| private void broadcastStateTransition(int type, int state) { |
| int idx = mStatusListeners.beginBroadcast(); |
| while (idx-- > 0) { |
| ICarEvsStatusListener listener = mStatusListeners.getBroadcastItem(idx); |
| try { |
| listener.onStatusChanged(new CarEvsStatus(type, state)); |
| } catch (RemoteException e) { |
| // Likely the binder death incident |
| Slog.e(TAG_EVS, Log.getStackTraceString(e)); |
| } |
| } |
| mStatusListeners.finishBroadcast(); |
| } |
| |
| /** Starts a requested service */ |
| private boolean startService(@CarEvsServiceType int type) { |
| if (type == CarEvsManager.SERVICE_TYPE_SURROUNDVIEW) { |
| // TODO(b/179029031): Removes below when Surround View service is integrated. |
| Slog.e(TAG_EVS, "Surround view is not supported yet."); |
| return false; |
| } |
| |
| if (!nativeConnectToHalServiceIfNecessary(mNativeEvsServiceObj)) { |
| Slog.e(TAG_EVS, "Failed to connect to EVS service"); |
| return false; |
| } |
| |
| String cameraId; |
| if (mUseCameraIdOverride) { |
| cameraId = mCameraIdOverride; |
| } else { |
| cameraId = mContext.getString(R.string.config_evsRearviewCameraId); |
| } |
| |
| if (!nativeOpenCamera(mNativeEvsServiceObj, cameraId)) { |
| Slog.e(TAG_EVS, "Failed to open a target camera device"); |
| return false; |
| } |
| |
| return true; |
| } |
| |
| /** Stops a current service */ |
| private void stopService() { |
| try { |
| nativeRequestToStopVideoStream(mNativeEvsServiceObj); |
| } catch (RuntimeException e) { |
| Slog.w(TAG_EVS, Log.getStackTraceString(e)); |
| } finally { |
| // Unregister all stream callbacks. |
| synchronized (mLock) { |
| mStreamCallback = null; |
| } |
| |
| // We simply drop all buffer records; the native method will return all pending buffers |
| // to the native Extended System View service if it is alive. |
| synchronized (mBufferRecords) { |
| mBufferRecords.clear(); |
| } |
| |
| // Cancel a pending message to check a request timeout |
| mHandler.removeCallbacks(mActivityRequestTimeoutRunnable); |
| } |
| } |
| |
| @GuardedBy("mLock") |
| private void handlePropertyEventLocked(CarPropertyEvent event) { |
| if (event.getEventType() != CarPropertyEvent.PROPERTY_EVENT_PROPERTY_CHANGE) { |
| // CarEvsService is interested only in the property change event. |
| return; |
| } |
| |
| CarPropertyValue value = event.getCarPropertyValue(); |
| if (value.getPropertyId() != VehicleProperty.GEAR_SELECTION) { |
| // CarEvsService is interested only in the GEAR_SELECTION property. |
| return; |
| } |
| |
| long timestamp = value.getTimestamp(); |
| if (timestamp <= mLastEvsHalEvent.getTimestamp()) { |
| if (DBG) { |
| Slog.d(TAG_EVS, |
| "Ignoring GEAR_SELECTION change happened past, timestamp = " + timestamp + |
| ", last event was at " + mLastEvsHalEvent.getTimestamp()); |
| } |
| return; |
| } |
| |
| // TODO(b/179029031): CarEvsService may need to process VehicleGear.GEAR_PARK when |
| // Surround View service is integrated. |
| int gear = (Integer) value.getValue(); |
| if (gear == VehicleGear.GEAR_REVERSE) { |
| // Request to start the rearview activity when the gear is shifted into the reverse |
| // position. |
| if (mStateEngine.execute(REQUEST_PRIORITY_HIGH, SERVICE_STATE_REQUESTED, |
| CarEvsManager.SERVICE_TYPE_REARVIEW) != ERROR_NONE) { |
| Slog.w(TAG_EVS, "Failed to request the rearview activity."); |
| } |
| } else { |
| // Request to stop the rearview activity when the gear is shifted from the reverse |
| // position to other positions. |
| if (mStateEngine.execute(REQUEST_PRIORITY_HIGH, SERVICE_STATE_INACTIVE, |
| CarEvsManager.SERVICE_TYPE_REARVIEW) != ERROR_NONE) { |
| Slog.d(TAG_EVS, "Failed to stop the rearview activity."); |
| } |
| } |
| |
| mLastEvsHalEvent = new EvsHalEvent(timestamp, CarEvsManager.SERVICE_TYPE_REARVIEW, |
| gear == VehicleGear.GEAR_REVERSE); |
| } |
| |
| /** Processes a streaming event and propagates it to registered clients */ |
| private void processStreamEvent(@CarEvsStreamEvent int event) { |
| synchronized (mLock) { |
| if (mStreamCallback == null) { |
| return; |
| } |
| |
| try { |
| mStreamCallback.onStreamEvent(event); |
| } catch (RemoteException e) { |
| // Likely the binder death incident |
| Slog.e(TAG_EVS, Log.getStackTraceString(e)); |
| } |
| } |
| } |
| |
| /** |
| * Processes a streaming event and propagates it to registered clients. |
| * |
| * @return True if this buffer is hold and used by the client, false otherwise. |
| */ |
| private boolean processNewFrame(int id, @NonNull HardwareBuffer buffer) { |
| Objects.requireNonNull(buffer); |
| |
| synchronized (mLock) { |
| if (mStreamCallback == null) { |
| return false; |
| } |
| |
| try { |
| mStreamCallback.onNewFrame(new CarEvsBufferDescriptor(id, buffer)); |
| mBufferRecords.add(id); |
| } catch (RemoteException e) { |
| // Likely the binder death incident |
| Slog.e(TAG_EVS, Log.getStackTraceString(e)); |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| |
| /** EVS stream event handler called after a native handler */ |
| private void postNativeEventHandler(int eventType) { |
| processStreamEvent( |
| CarEvsServiceUtils.convertToStreamEvent(eventType)); |
| } |
| |
| /** EVS frame handler called after a native handler */ |
| private void postNativeFrameHandler(int id, HardwareBuffer buffer) { |
| if (!processNewFrame(id, buffer)) { |
| // No client uses this buffer. |
| Slog.d(TAG_EVS, "Returns buffer " + id + " because no client uses it."); |
| nativeDoneWithFrame(mNativeEvsServiceObj, id); |
| } |
| } |
| |
| /** EVS service death handler called after a native handler */ |
| private void postNativeDeathHandler() { |
| // We have lost the Extended View System service. |
| mStateEngine.execute(REQUEST_PRIORITY_HIGH, SERVICE_STATE_UNAVAILABLE); |
| connectToHalServiceIfNecessary(EVS_HAL_SERVICE_BIND_RETRY_INTERVAL_MS); |
| } |
| |
| /** Try to connect to the EVS HAL service until it succeeds at a given interval */ |
| private void connectToHalServiceIfNecessary(long intervalInMillis) { |
| Slog.d(TAG_EVS, "Trying to connect to the EVS HAL service."); |
| if (mStateEngine.execute(REQUEST_PRIORITY_HIGH, SERVICE_STATE_INACTIVE) != ERROR_NONE) { |
| // Try to restore a connection again after a given amount of time |
| mHandler.postDelayed(() -> connectToHalServiceIfNecessary(intervalInMillis), |
| intervalInMillis); |
| } |
| } |
| |
| /** Notify the client of a video stream loss */ |
| private static void notifyStreamStopped(@NonNull ICarEvsStreamCallback callback) { |
| Objects.requireNonNull(callback); |
| |
| try { |
| callback.onStreamEvent(CarEvsManager.STREAM_EVENT_STREAM_STOPPED); |
| } catch (RemoteException e) { |
| // Likely the binder death incident |
| Slog.w(TAG_EVS, Log.getStackTraceString(e)); |
| } |
| } |
| |
| /** |
| * Because of its dependency on FMQ type, android.hardware.automotive.evs@1.1 interface does |
| * not support Java backend. Therefore, all hwbinder transactions happen in native methods |
| * declared below. |
| */ |
| |
| static { |
| System.loadLibrary("carservicejni"); |
| } |
| |
| /** Stores a service handle initialized in native methods */ |
| private long mNativeEvsServiceObj = 0; |
| |
| /** Attempts to connect to the HAL service if it has not done yet */ |
| private native boolean nativeConnectToHalServiceIfNecessary(long handle); |
| |
| /** Attempts to disconnect from the HAL service */ |
| private native void nativeDisconnectFromHalService(long handle); |
| |
| /** Attempts to open a target camera device */ |
| private native boolean nativeOpenCamera(long handle, String cameraId); |
| |
| /** Requests to close a target camera device */ |
| private native void nativeCloseCamera(long handle); |
| |
| /** Requests to start a video stream */ |
| private native boolean nativeRequestToStartVideoStream(long handle); |
| |
| /** Requests to stop a video stream */ |
| private native void nativeRequestToStopVideoStream(long handle); |
| |
| /** Request to return an used buffer */ |
| private native void nativeDoneWithFrame(long handle, int bufferId); |
| |
| /** Creates a EVS service handle */ |
| private static native long nativeCreateServiceHandle(); |
| |
| /** Destroys a EVS service handle */ |
| private static native void nativeDestroyServiceHandle(long handle); |
| } |
