services/java/com/android/server/display/WifiDisplayAdapter.java - platform/frameworks/base - Git at Google

 /*
  * Copyright (C) 2012 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.server.display;

 import com.android.internal.util.DumpUtils;
 import com.android.internal.util.IndentingPrintWriter;

 import android.content.Context;
 import android.content.Intent;
 import android.hardware.display.DisplayManager;
 import android.hardware.display.WifiDisplay;
 import android.hardware.display.WifiDisplayStatus;
 import android.media.RemoteDisplay;
 import android.os.Handler;
 import android.os.IBinder;
 import android.util.Slog;
 import android.view.Surface;

 import java.io.PrintWriter;
 import java.util.Arrays;

 /**
  * Connects to Wifi displays that implement the Miracast protocol.
  * <p>
  * The Wifi display protocol relies on Wifi direct for discovering and pairing
  * with the display.  Once connected, the Media Server opens an RTSP socket and accepts
  * a connection from the display.  After session negotiation, the Media Server
  * streams encoded buffers to the display.
  * </p><p>
  * This class is responsible for connecting to Wifi displays and mediating
  * the interactions between Media Server, Surface Flinger and the Display Manager Service.
  * </p><p>
  * Display adapters are guarded by the {@link DisplayManagerService.SyncRoot} lock.
  * </p>
  */
 final class WifiDisplayAdapter extends DisplayAdapter {
     private static final String TAG = "WifiDisplayAdapter";

     private static final boolean DEBUG = false;

     private final PersistentDataStore mPersistentDataStore;
     private final boolean mSupportsProtectedBuffers;

     private WifiDisplayController mDisplayController;
     private WifiDisplayDevice mDisplayDevice;

     private WifiDisplayStatus mCurrentStatus;
     private int mFeatureState;
     private int mScanState;
     private int mActiveDisplayState;
     private WifiDisplay mActiveDisplay;
     private WifiDisplay[] mAvailableDisplays = WifiDisplay.EMPTY_ARRAY;
     private WifiDisplay[] mRememberedDisplays = WifiDisplay.EMPTY_ARRAY;

     private boolean mPendingStatusChangeBroadcast;

     public WifiDisplayAdapter(DisplayManagerService.SyncRoot syncRoot,
             Context context, Handler handler, Listener listener,
             PersistentDataStore persistentDataStore) {
         super(syncRoot, context, handler, listener, TAG);
         mPersistentDataStore = persistentDataStore;
         mSupportsProtectedBuffers = context.getResources().getBoolean(
                 com.android.internal.R.bool.config_wifiDisplaySupportsProtectedBuffers);
     }

     @Override
     public void dumpLocked(PrintWriter pw) {
         super.dumpLocked(pw);

         pw.println("mCurrentStatus=" + getWifiDisplayStatusLocked());
         pw.println("mFeatureState=" + mFeatureState);
         pw.println("mScanState=" + mScanState);
         pw.println("mActiveDisplayState=" + mActiveDisplayState);
         pw.println("mActiveDisplay=" + mActiveDisplay);
         pw.println("mAvailableDisplays=" + Arrays.toString(mAvailableDisplays));
         pw.println("mRememberedDisplays=" + Arrays.toString(mRememberedDisplays));
         pw.println("mPendingStatusChangeBroadcast=" + mPendingStatusChangeBroadcast);
         pw.println("mSupportsProtectedBuffers=" + mSupportsProtectedBuffers);

         // Try to dump the controller state.
         if (mDisplayController == null) {
             pw.println("mDisplayController=null");
         } else {
             pw.println("mDisplayController:");
             final IndentingPrintWriter ipw = new IndentingPrintWriter(pw, "  ");
             ipw.increaseIndent();
             DumpUtils.dumpAsync(getHandler(), mDisplayController, ipw, 200);
         }
     }

     @Override
     public void registerLocked() {
         super.registerLocked();

         updateRememberedDisplaysLocked();

         getHandler().post(new Runnable() {
             @Override
             public void run() {
                 mDisplayController = new WifiDisplayController(
                         getContext(), getHandler(), mWifiDisplayListener);
             }
         });
     }

     public void requestScanLocked() {
         if (DEBUG) {
             Slog.d(TAG, "requestScanLocked");
         }

         getHandler().post(new Runnable() {
             @Override
             public void run() {
                 if (mDisplayController != null) {
                     mDisplayController.requestScan();
                 }
             }
         });
     }

     public void requestConnectLocked(final String address, final boolean trusted) {
         if (DEBUG) {
             Slog.d(TAG, "requestConnectLocked: address=" + address + ", trusted=" + trusted);
         }

         if (!trusted) {
             synchronized (getSyncRoot()) {
                 if (!isRememberedDisplayLocked(address)) {
                     Slog.w(TAG, "Ignoring request by an untrusted client to connect to "
                             + "an unknown wifi display: " + address);
                     return;
                 }
             }
         }

         getHandler().post(new Runnable() {
             @Override
             public void run() {
                 if (mDisplayController != null) {
                     mDisplayController.requestConnect(address);
                 }
             }
         });
     }

     private boolean isRememberedDisplayLocked(String address) {
         for (WifiDisplay display : mRememberedDisplays) {
             if (display.getDeviceAddress().equals(address)) {
                 return true;
             }
         }
         return false;
     }

     public void requestDisconnectLocked() {
         if (DEBUG) {
             Slog.d(TAG, "requestDisconnectedLocked");
         }

         getHandler().post(new Runnable() {
             @Override
             public void run() {
                 if (mDisplayController != null) {
                     mDisplayController.requestDisconnect();
                 }
             }
         });
     }

     public void requestRenameLocked(String address, String alias) {
         if (DEBUG) {
             Slog.d(TAG, "requestRenameLocked: address=" + address + ", alias=" + alias);
         }

         if (alias != null) {
             alias = alias.trim();
             if (alias.isEmpty() || alias.equals(address)) {
                 alias = null;
             }
         }

         if (mPersistentDataStore.renameWifiDisplay(address, alias)) {
             mPersistentDataStore.saveIfNeeded();
             updateRememberedDisplaysLocked();
             scheduleStatusChangedBroadcastLocked();
         }
     }

     public void requestForgetLocked(String address) {
         if (DEBUG) {
             Slog.d(TAG, "requestForgetLocked: address=" + address);
         }

         if (mPersistentDataStore.forgetWifiDisplay(address)) {
             mPersistentDataStore.saveIfNeeded();
             updateRememberedDisplaysLocked();
             scheduleStatusChangedBroadcastLocked();
         }

         if (mActiveDisplay != null && mActiveDisplay.getDeviceAddress().equals(address)) {
             requestDisconnectLocked();
         }
     }

     public WifiDisplayStatus getWifiDisplayStatusLocked() {
         if (mCurrentStatus == null) {
             mCurrentStatus = new WifiDisplayStatus(
                     mFeatureState, mScanState, mActiveDisplayState,
                     mActiveDisplay, mAvailableDisplays, mRememberedDisplays);
         }

         if (DEBUG) {
             Slog.d(TAG, "getWifiDisplayStatusLocked: result=" + mCurrentStatus);
         }
         return mCurrentStatus;
     }

     private void updateRememberedDisplaysLocked() {
         mRememberedDisplays = mPersistentDataStore.getRememberedWifiDisplays();
         mActiveDisplay = mPersistentDataStore.applyWifiDisplayAlias(mActiveDisplay);
         mAvailableDisplays = mPersistentDataStore.applyWifiDisplayAliases(mAvailableDisplays);
     }

     private void handleConnectLocked(WifiDisplay display,
             Surface surface, int width, int height, int flags) {
         handleDisconnectLocked();

         if (mPersistentDataStore.rememberWifiDisplay(display)) {
             mPersistentDataStore.saveIfNeeded();
             updateRememberedDisplaysLocked();
             scheduleStatusChangedBroadcastLocked();
         }

         int deviceFlags = 0;
         if ((flags & RemoteDisplay.DISPLAY_FLAG_SECURE) != 0) {
             deviceFlags |= DisplayDeviceInfo.FLAG_SECURE;
         }
         if (mSupportsProtectedBuffers) {
             deviceFlags |= DisplayDeviceInfo.FLAG_SUPPORTS_PROTECTED_BUFFERS;
         }

         float refreshRate = 60.0f; // TODO: get this for real

         String name = display.getFriendlyDisplayName();
         IBinder displayToken = Surface.createDisplay(name);
         mDisplayDevice = new WifiDisplayDevice(displayToken, name, width, height,
                 refreshRate, deviceFlags, surface);
         sendDisplayDeviceEventLocked(mDisplayDevice, DISPLAY_DEVICE_EVENT_ADDED);
     }

     private void handleDisconnectLocked() {
         if (mDisplayDevice != null) {
             mDisplayDevice.clearSurfaceLocked();
             sendDisplayDeviceEventLocked(mDisplayDevice, DISPLAY_DEVICE_EVENT_REMOVED);
             mDisplayDevice = null;
         }
     }

     private void scheduleStatusChangedBroadcastLocked() {
         mCurrentStatus = null;
         if (!mPendingStatusChangeBroadcast) {
             mPendingStatusChangeBroadcast = true;
             getHandler().post(mStatusChangeBroadcast);
         }
     }

     private final Runnable mStatusChangeBroadcast = new Runnable() {
         @Override
         public void run() {
             final Intent intent;
             synchronized (getSyncRoot()) {
                 if (!mPendingStatusChangeBroadcast) {
                     return;
                 }

                 mPendingStatusChangeBroadcast = false;
                 intent = new Intent(DisplayManager.ACTION_WIFI_DISPLAY_STATUS_CHANGED);
                 intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY);
                 intent.putExtra(DisplayManager.EXTRA_WIFI_DISPLAY_STATUS,
                         getWifiDisplayStatusLocked());
             }

             // Send protected broadcast about wifi display status to registered receivers.
             getContext().sendBroadcast(intent);
         }
     };

     private final WifiDisplayController.Listener mWifiDisplayListener =
             new WifiDisplayController.Listener() {
         @Override
         public void onFeatureStateChanged(int featureState) {
             synchronized (getSyncRoot()) {
                 if (mFeatureState != featureState) {
                     mFeatureState = featureState;
                     scheduleStatusChangedBroadcastLocked();
                 }
             }
         }

         @Override
         public void onScanStarted() {
             synchronized (getSyncRoot()) {
                 if (mScanState != WifiDisplayStatus.SCAN_STATE_SCANNING) {
                     mScanState = WifiDisplayStatus.SCAN_STATE_SCANNING;
                     scheduleStatusChangedBroadcastLocked();
                 }
             }
         }

         @Override
         public void onScanFinished(WifiDisplay[] availableDisplays) {
             synchronized (getSyncRoot()) {
                 availableDisplays = mPersistentDataStore.applyWifiDisplayAliases(
                         availableDisplays);

                 if (mScanState != WifiDisplayStatus.SCAN_STATE_NOT_SCANNING
                         || !Arrays.equals(mAvailableDisplays, availableDisplays)) {
                     mScanState = WifiDisplayStatus.SCAN_STATE_NOT_SCANNING;
                     mAvailableDisplays = availableDisplays;
                     scheduleStatusChangedBroadcastLocked();
                 }
             }
         }

         @Override
         public void onDisplayConnecting(WifiDisplay display) {
             synchronized (getSyncRoot()) {
                 display = mPersistentDataStore.applyWifiDisplayAlias(display);

                 if (mActiveDisplayState != WifiDisplayStatus.DISPLAY_STATE_CONNECTING
                         || mActiveDisplay == null
                         || !mActiveDisplay.equals(display)) {
                     mActiveDisplayState = WifiDisplayStatus.DISPLAY_STATE_CONNECTING;
                     mActiveDisplay = display;
                     scheduleStatusChangedBroadcastLocked();
                 }
             }
         }

         @Override
         public void onDisplayConnectionFailed() {
             synchronized (getSyncRoot()) {
                 if (mActiveDisplayState != WifiDisplayStatus.DISPLAY_STATE_NOT_CONNECTED
                         || mActiveDisplay != null) {
                     mActiveDisplayState = WifiDisplayStatus.DISPLAY_STATE_NOT_CONNECTED;
                     mActiveDisplay = null;
                     scheduleStatusChangedBroadcastLocked();
                 }
             }
         }

         @Override
         public void onDisplayConnected(WifiDisplay display, Surface surface,
                 int width, int height, int flags) {
             synchronized (getSyncRoot()) {
                 display = mPersistentDataStore.applyWifiDisplayAlias(display);
                 handleConnectLocked(display, surface, width, height, flags);

                 if (mActiveDisplayState != WifiDisplayStatus.DISPLAY_STATE_CONNECTED
                         || mActiveDisplay == null
                         || !mActiveDisplay.equals(display)) {
                     mActiveDisplayState = WifiDisplayStatus.DISPLAY_STATE_CONNECTED;
                     mActiveDisplay = display;
                     scheduleStatusChangedBroadcastLocked();
                 }
             }
         }

         @Override
         public void onDisplayDisconnected() {
             // Stop listening.
             synchronized (getSyncRoot()) {
                 handleDisconnectLocked();

                 if (mActiveDisplayState != WifiDisplayStatus.DISPLAY_STATE_NOT_CONNECTED
                         || mActiveDisplay != null) {
                     mActiveDisplayState = WifiDisplayStatus.DISPLAY_STATE_NOT_CONNECTED;
                     mActiveDisplay = null;
                     scheduleStatusChangedBroadcastLocked();
                 }
             }
         }
     };

     private final class WifiDisplayDevice extends DisplayDevice {
         private final String mName;
         private final int mWidth;
         private final int mHeight;
         private final float mRefreshRate;
         private final int mFlags;

         private Surface mSurface;
         private DisplayDeviceInfo mInfo;

         public WifiDisplayDevice(IBinder displayToken, String name,
                 int width, int height, float refreshRate, int flags,
                 Surface surface) {
             super(WifiDisplayAdapter.this, displayToken);
             mName = name;
             mWidth = width;
             mHeight = height;
             mRefreshRate = refreshRate;
             mFlags = flags;
             mSurface = surface;
         }

         public void clearSurfaceLocked() {
             mSurface = null;
             sendTraversalRequestLocked();
         }

         @Override
         public void performTraversalInTransactionLocked() {
             setSurfaceInTransactionLocked(mSurface);
         }

         @Override
         public DisplayDeviceInfo getDisplayDeviceInfoLocked() {
             if (mInfo == null) {
                 mInfo = new DisplayDeviceInfo();
                 mInfo.name = mName;
                 mInfo.width = mWidth;
                 mInfo.height = mHeight;
                 mInfo.refreshRate = mRefreshRate;
                 mInfo.flags = mFlags;
                 mInfo.touch = DisplayDeviceInfo.TOUCH_EXTERNAL;
                 mInfo.setAssumedDensityForExternalDisplay(mWidth, mHeight);
             }
             return mInfo;
         }
     }
 }
	/*
	* Copyright (C) 2012 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.server.display;

	import com.android.internal.util.DumpUtils;
	import com.android.internal.util.IndentingPrintWriter;

	import android.content.Context;
	import android.content.Intent;
	import android.hardware.display.DisplayManager;
	import android.hardware.display.WifiDisplay;
	import android.hardware.display.WifiDisplayStatus;
	import android.media.RemoteDisplay;
	import android.os.Handler;
	import android.os.IBinder;
	import android.util.Slog;
	import android.view.Surface;

	import java.io.PrintWriter;
	import java.util.Arrays;

	/**
	* Connects to Wifi displays that implement the Miracast protocol.
	* <p>
	* The Wifi display protocol relies on Wifi direct for discovering and pairing
	* with the display. Once connected, the Media Server opens an RTSP socket and accepts
	* a connection from the display. After session negotiation, the Media Server
	* streams encoded buffers to the display.
	* </p><p>
	* This class is responsible for connecting to Wifi displays and mediating
	* the interactions between Media Server, Surface Flinger and the Display Manager Service.
	* </p><p>
	* Display adapters are guarded by the {@link DisplayManagerService.SyncRoot} lock.
	* </p>
	*/
	final class WifiDisplayAdapter extends DisplayAdapter {
	private static final String TAG = "WifiDisplayAdapter";

	private static final boolean DEBUG = false;

	private final PersistentDataStore mPersistentDataStore;
	private final boolean mSupportsProtectedBuffers;

	private WifiDisplayController mDisplayController;
	private WifiDisplayDevice mDisplayDevice;

	private WifiDisplayStatus mCurrentStatus;
	private int mFeatureState;
	private int mScanState;
	private int mActiveDisplayState;
	private WifiDisplay mActiveDisplay;
	private WifiDisplay[] mAvailableDisplays = WifiDisplay.EMPTY_ARRAY;
	private WifiDisplay[] mRememberedDisplays = WifiDisplay.EMPTY_ARRAY;

	private boolean mPendingStatusChangeBroadcast;

	public WifiDisplayAdapter(DisplayManagerService.SyncRoot syncRoot,
	Context context, Handler handler, Listener listener,
	PersistentDataStore persistentDataStore) {
	super(syncRoot, context, handler, listener, TAG);
	mPersistentDataStore = persistentDataStore;
	mSupportsProtectedBuffers = context.getResources().getBoolean(
	com.android.internal.R.bool.config_wifiDisplaySupportsProtectedBuffers);
	}

	@Override
	public void dumpLocked(PrintWriter pw) {
	super.dumpLocked(pw);

	pw.println("mCurrentStatus=" + getWifiDisplayStatusLocked());
	pw.println("mFeatureState=" + mFeatureState);
	pw.println("mScanState=" + mScanState);
	pw.println("mActiveDisplayState=" + mActiveDisplayState);
	pw.println("mActiveDisplay=" + mActiveDisplay);
	pw.println("mAvailableDisplays=" + Arrays.toString(mAvailableDisplays));
	pw.println("mRememberedDisplays=" + Arrays.toString(mRememberedDisplays));
	pw.println("mPendingStatusChangeBroadcast=" + mPendingStatusChangeBroadcast);
	pw.println("mSupportsProtectedBuffers=" + mSupportsProtectedBuffers);

	// Try to dump the controller state.
	if (mDisplayController == null) {
	pw.println("mDisplayController=null");
	} else {
	pw.println("mDisplayController:");
	final IndentingPrintWriter ipw = new IndentingPrintWriter(pw, " ");
	ipw.increaseIndent();
	DumpUtils.dumpAsync(getHandler(), mDisplayController, ipw, 200);
	}
	}

	@Override
	public void registerLocked() {
	super.registerLocked();

	updateRememberedDisplaysLocked();

	getHandler().post(new Runnable() {
	@Override
	public void run() {
	mDisplayController = new WifiDisplayController(
	getContext(), getHandler(), mWifiDisplayListener);
	}
	});
	}

	public void requestScanLocked() {
	if (DEBUG) {
	Slog.d(TAG, "requestScanLocked");
	}

	getHandler().post(new Runnable() {
	@Override
	public void run() {
	if (mDisplayController != null) {
	mDisplayController.requestScan();
	}
	}
	});
	}

	public void requestConnectLocked(final String address, final boolean trusted) {
	if (DEBUG) {
	Slog.d(TAG, "requestConnectLocked: address=" + address + ", trusted=" + trusted);
	}

	if (!trusted) {
	synchronized (getSyncRoot()) {
	if (!isRememberedDisplayLocked(address)) {
	Slog.w(TAG, "Ignoring request by an untrusted client to connect to "
	+ "an unknown wifi display: " + address);
	return;
	}
	}
	}

	getHandler().post(new Runnable() {
	@Override
	public void run() {
	if (mDisplayController != null) {
	mDisplayController.requestConnect(address);
	}
	}
	});
	}

	private boolean isRememberedDisplayLocked(String address) {
	for (WifiDisplay display : mRememberedDisplays) {
	if (display.getDeviceAddress().equals(address)) {
	return true;
	}
	}
	return false;
	}

	public void requestDisconnectLocked() {
	if (DEBUG) {
	Slog.d(TAG, "requestDisconnectedLocked");
	}

	getHandler().post(new Runnable() {
	@Override
	public void run() {
	if (mDisplayController != null) {
	mDisplayController.requestDisconnect();
	}
	}
	});
	}

	public void requestRenameLocked(String address, String alias) {
	if (DEBUG) {
	Slog.d(TAG, "requestRenameLocked: address=" + address + ", alias=" + alias);
	}

	if (alias != null) {
	alias = alias.trim();
	if (alias.isEmpty() \|\| alias.equals(address)) {
	alias = null;
	}
	}

	if (mPersistentDataStore.renameWifiDisplay(address, alias)) {
	mPersistentDataStore.saveIfNeeded();
	updateRememberedDisplaysLocked();
	scheduleStatusChangedBroadcastLocked();
	}
	}

	public void requestForgetLocked(String address) {
	if (DEBUG) {
	Slog.d(TAG, "requestForgetLocked: address=" + address);
	}

	if (mPersistentDataStore.forgetWifiDisplay(address)) {
	mPersistentDataStore.saveIfNeeded();
	updateRememberedDisplaysLocked();
	scheduleStatusChangedBroadcastLocked();
	}

	if (mActiveDisplay != null && mActiveDisplay.getDeviceAddress().equals(address)) {
	requestDisconnectLocked();
	}
	}

	public WifiDisplayStatus getWifiDisplayStatusLocked() {
	if (mCurrentStatus == null) {
	mCurrentStatus = new WifiDisplayStatus(
	mFeatureState, mScanState, mActiveDisplayState,
	mActiveDisplay, mAvailableDisplays, mRememberedDisplays);
	}

	if (DEBUG) {
	Slog.d(TAG, "getWifiDisplayStatusLocked: result=" + mCurrentStatus);
	}
	return mCurrentStatus;
	}

	private void updateRememberedDisplaysLocked() {
	mRememberedDisplays = mPersistentDataStore.getRememberedWifiDisplays();
	mActiveDisplay = mPersistentDataStore.applyWifiDisplayAlias(mActiveDisplay);
	mAvailableDisplays = mPersistentDataStore.applyWifiDisplayAliases(mAvailableDisplays);
	}

	private void handleConnectLocked(WifiDisplay display,
	Surface surface, int width, int height, int flags) {
	handleDisconnectLocked();

	if (mPersistentDataStore.rememberWifiDisplay(display)) {
	mPersistentDataStore.saveIfNeeded();
	updateRememberedDisplaysLocked();
	scheduleStatusChangedBroadcastLocked();
	}

	int deviceFlags = 0;
	if ((flags & RemoteDisplay.DISPLAY_FLAG_SECURE) != 0) {
	deviceFlags \|= DisplayDeviceInfo.FLAG_SECURE;
	}
	if (mSupportsProtectedBuffers) {
	deviceFlags \|= DisplayDeviceInfo.FLAG_SUPPORTS_PROTECTED_BUFFERS;
	}

	float refreshRate = 60.0f; // TODO: get this for real

	String name = display.getFriendlyDisplayName();
	IBinder displayToken = Surface.createDisplay(name);
	mDisplayDevice = new WifiDisplayDevice(displayToken, name, width, height,
	refreshRate, deviceFlags, surface);
	sendDisplayDeviceEventLocked(mDisplayDevice, DISPLAY_DEVICE_EVENT_ADDED);
	}

	private void handleDisconnectLocked() {
	if (mDisplayDevice != null) {
	mDisplayDevice.clearSurfaceLocked();
	sendDisplayDeviceEventLocked(mDisplayDevice, DISPLAY_DEVICE_EVENT_REMOVED);
	mDisplayDevice = null;
	}
	}

	private void scheduleStatusChangedBroadcastLocked() {
	mCurrentStatus = null;
	if (!mPendingStatusChangeBroadcast) {
	mPendingStatusChangeBroadcast = true;
	getHandler().post(mStatusChangeBroadcast);
	}
	}

	private final Runnable mStatusChangeBroadcast = new Runnable() {
	@Override
	public void run() {
	final Intent intent;
	synchronized (getSyncRoot()) {
	if (!mPendingStatusChangeBroadcast) {
	return;
	}

	mPendingStatusChangeBroadcast = false;
	intent = new Intent(DisplayManager.ACTION_WIFI_DISPLAY_STATUS_CHANGED);
	intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY);
	intent.putExtra(DisplayManager.EXTRA_WIFI_DISPLAY_STATUS,
	getWifiDisplayStatusLocked());
	}

	// Send protected broadcast about wifi display status to registered receivers.
	getContext().sendBroadcast(intent);
	}
	};

	private final WifiDisplayController.Listener mWifiDisplayListener =
	new WifiDisplayController.Listener() {
	@Override
	public void onFeatureStateChanged(int featureState) {
	synchronized (getSyncRoot()) {
	if (mFeatureState != featureState) {
	mFeatureState = featureState;
	scheduleStatusChangedBroadcastLocked();
	}
	}
	}

	@Override
	public void onScanStarted() {
	synchronized (getSyncRoot()) {
	if (mScanState != WifiDisplayStatus.SCAN_STATE_SCANNING) {
	mScanState = WifiDisplayStatus.SCAN_STATE_SCANNING;
	scheduleStatusChangedBroadcastLocked();
	}
	}
	}

	@Override
	public void onScanFinished(WifiDisplay[] availableDisplays) {
	synchronized (getSyncRoot()) {
	availableDisplays = mPersistentDataStore.applyWifiDisplayAliases(
	availableDisplays);

	if (mScanState != WifiDisplayStatus.SCAN_STATE_NOT_SCANNING
	\|\| !Arrays.equals(mAvailableDisplays, availableDisplays)) {
	mScanState = WifiDisplayStatus.SCAN_STATE_NOT_SCANNING;
	mAvailableDisplays = availableDisplays;
	scheduleStatusChangedBroadcastLocked();
	}
	}
	}

	@Override
	public void onDisplayConnecting(WifiDisplay display) {
	synchronized (getSyncRoot()) {
	display = mPersistentDataStore.applyWifiDisplayAlias(display);

	if (mActiveDisplayState != WifiDisplayStatus.DISPLAY_STATE_CONNECTING
	\|\| mActiveDisplay == null
	\|\| !mActiveDisplay.equals(display)) {
	mActiveDisplayState = WifiDisplayStatus.DISPLAY_STATE_CONNECTING;
	mActiveDisplay = display;
	scheduleStatusChangedBroadcastLocked();
	}
	}
	}

	@Override
	public void onDisplayConnectionFailed() {
	synchronized (getSyncRoot()) {
	if (mActiveDisplayState != WifiDisplayStatus.DISPLAY_STATE_NOT_CONNECTED
	\|\| mActiveDisplay != null) {
	mActiveDisplayState = WifiDisplayStatus.DISPLAY_STATE_NOT_CONNECTED;
	mActiveDisplay = null;
	scheduleStatusChangedBroadcastLocked();
	}
	}
	}

	@Override
	public void onDisplayConnected(WifiDisplay display, Surface surface,
	int width, int height, int flags) {
	synchronized (getSyncRoot()) {
	display = mPersistentDataStore.applyWifiDisplayAlias(display);
	handleConnectLocked(display, surface, width, height, flags);

	if (mActiveDisplayState != WifiDisplayStatus.DISPLAY_STATE_CONNECTED
	\|\| mActiveDisplay == null
	\|\| !mActiveDisplay.equals(display)) {
	mActiveDisplayState = WifiDisplayStatus.DISPLAY_STATE_CONNECTED;
	mActiveDisplay = display;
	scheduleStatusChangedBroadcastLocked();
	}
	}
	}

	@Override
	public void onDisplayDisconnected() {
	// Stop listening.
	synchronized (getSyncRoot()) {
	handleDisconnectLocked();

	if (mActiveDisplayState != WifiDisplayStatus.DISPLAY_STATE_NOT_CONNECTED
	\|\| mActiveDisplay != null) {
	mActiveDisplayState = WifiDisplayStatus.DISPLAY_STATE_NOT_CONNECTED;
	mActiveDisplay = null;
	scheduleStatusChangedBroadcastLocked();
	}
	}
	}
	};

	private final class WifiDisplayDevice extends DisplayDevice {
	private final String mName;
	private final int mWidth;
	private final int mHeight;
	private final float mRefreshRate;
	private final int mFlags;

	private Surface mSurface;
	private DisplayDeviceInfo mInfo;

	public WifiDisplayDevice(IBinder displayToken, String name,
	int width, int height, float refreshRate, int flags,
	Surface surface) {
	super(WifiDisplayAdapter.this, displayToken);
	mName = name;
	mWidth = width;
	mHeight = height;
	mRefreshRate = refreshRate;
	mFlags = flags;
	mSurface = surface;
	}

	public void clearSurfaceLocked() {
	mSurface = null;
	sendTraversalRequestLocked();
	}

	@Override
	public void performTraversalInTransactionLocked() {
	setSurfaceInTransactionLocked(mSurface);
	}

	@Override
	public DisplayDeviceInfo getDisplayDeviceInfoLocked() {
	if (mInfo == null) {
	mInfo = new DisplayDeviceInfo();
	mInfo.name = mName;
	mInfo.width = mWidth;
	mInfo.height = mHeight;
	mInfo.refreshRate = mRefreshRate;
	mInfo.flags = mFlags;
	mInfo.touch = DisplayDeviceInfo.TOUCH_EXTERNAL;
	mInfo.setAssumedDensityForExternalDisplay(mWidth, mHeight);
	}
	return mInfo;
	}
	}
	}