From 89c2cb6f31cddb926dea3498f8adf01a8cc1426a Mon Sep 17 00:00:00 2001
From: Michael Wright <michaelwr@google.com>
Date: Sun, 14 Sep 2014 13:06:34 -0700
Subject: [PATCH] Monitor MediaRouter for remote display connections.

Since we're reusing the cast tile for screen sharing we need to make sure there's only ever one
mirroring presentation going on at a time.

Bug: 9905068
Change-Id: I249932d0f8853880dd453eb57c2a258e6ae952b0
---
 .../MediaProjectionManagerService.java        | 37 +++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/services/core/java/com/android/server/media/projection/MediaProjectionManagerService.java b/services/core/java/com/android/server/media/projection/MediaProjectionManagerService.java
index 8a1f3ad5479ce..cdfb656f439ed 100644
--- a/services/core/java/com/android/server/media/projection/MediaProjectionManagerService.java
+++ b/services/core/java/com/android/server/media/projection/MediaProjectionManagerService.java
@@ -23,6 +23,7 @@ import android.app.AppOpsManager;
 import android.content.Context;
 import android.content.pm.PackageManager;
 import android.hardware.display.DisplayManager;
+import android.media.MediaRouter;
 import android.media.projection.IMediaProjectionManager;
 import android.media.projection.IMediaProjection;
 import android.media.projection.IMediaProjectionCallback;
@@ -68,6 +69,10 @@ public final class MediaProjectionManagerService extends SystemService
     private final Context mContext;
     private final AppOpsManager mAppOps;
 
+    private final MediaRouter mMediaRouter;
+    private final MediaRouterCallback mMediaRouterCallback;
+    private MediaRouter.RouteInfo mMediaRouteInfo;
+
     private IBinder mProjectionToken;
     private MediaProjection mProjectionGrant;
 
@@ -77,6 +82,8 @@ public final class MediaProjectionManagerService extends SystemService
         mDeathEaters = new ArrayMap<IBinder, IBinder.DeathRecipient>();
         mCallbackDelegate = new CallbackDelegate();
         mAppOps = (AppOpsManager) mContext.getSystemService(Context.APP_OPS_SERVICE);
+        mMediaRouter = (MediaRouter) mContext.getSystemService(Context.MEDIA_ROUTER_SERVICE);
+        mMediaRouterCallback = new MediaRouterCallback();
         Watchdog.getInstance().addMonitor(this);
     }
 
@@ -84,6 +91,12 @@ public final class MediaProjectionManagerService extends SystemService
     public void onStart() {
         publishBinderService(Context.MEDIA_PROJECTION_SERVICE, new BinderService(),
                 false /*allowIsolated*/);
+        mMediaRouter.addCallback(MediaRouter.ROUTE_TYPE_REMOTE_DISPLAY, mMediaRouterCallback);
+    }
+
+    @Override
+    public void onSwitchUser(int userId) {
+        mMediaRouter.rebindAsUser(userId);
     }
 
     @Override
@@ -95,6 +108,9 @@ public final class MediaProjectionManagerService extends SystemService
         if (mProjectionGrant != null) {
             mProjectionGrant.stop();
         }
+        if (mMediaRouteInfo != null) {
+            mMediaRouter.getDefaultRoute().select();
+        }
         mProjectionToken = projection.asBinder();
         mProjectionGrant = projection;
         dispatchStart(projection);
@@ -448,6 +464,27 @@ public final class MediaProjectionManagerService extends SystemService
         }
     }
 
+    private class MediaRouterCallback extends MediaRouter.SimpleCallback {
+        @Override
+        public void onRouteSelected(MediaRouter router, int type, MediaRouter.RouteInfo info) {
+            synchronized (mLock) {
+                if ((type & MediaRouter.ROUTE_TYPE_REMOTE_DISPLAY) != 0) {
+                    mMediaRouteInfo = info;
+                    if (mProjectionGrant != null) {
+                        mProjectionGrant.stop();
+                    }
+                }
+            }
+        }
+
+        @Override
+        public void onRouteUnselected(MediaRouter route, int type, MediaRouter.RouteInfo info) {
+            if (mMediaRouteInfo == info) {
+                mMediaRouteInfo = null;
+            }
+        }
+    }
+
 
     private static class CallbackDelegate {
         private Map<IBinder, IMediaProjectionCallback> mClientCallbacks;