Notify ARC status update to AudioService.

Whenever ARC status is updated it should be notified to
AudioService so that it reroutes audio output to others.

Bug: 15841544, Bug: 15844022, Bug: 15844112

Change-Id: I06674ee4dd22c0f9be08e33fbacdd785578ba55f

services/core/java/com/android/server/hdmi/HdmiCecLocalDeviceTv.java

@@ -20,6 +20,7 @@ import android.hardware.hdmi.HdmiCec;
 import android.hardware.hdmi.HdmiCecDeviceInfo;
 import android.hardware.hdmi.HdmiCecMessage;
 import android.hardware.hdmi.IHdmiControlCallback;
+import android.media.AudioSystem;
 import android.os.RemoteException;
 import android.util.Slog;
 import android.util.SparseArray;
@@ -47,7 +48,6 @@ final class HdmiCecLocalDeviceTv extends HdmiCecLocalDevice {
     @GuardedBy("mLock")
     private boolean mSystemAudioMode;
 
-
     // Copy of mDeviceInfos to guarantee thread-safety.
     @GuardedBy("mLock")
     private List<HdmiCecDeviceInfo> mSafeAllDeviceInfos = Collections.emptyList();
@@ -312,15 +312,21 @@ final class HdmiCecLocalDeviceTv extends HdmiCecLocalDevice {
             boolean oldStatus = mArcStatusEnabled;
             // 1. Enable/disable ARC circuit.
             mService.setAudioReturnChannel(enabled);
-
-            // TODO: notify arc mode change to AudioManager.
-
-            // 2. Update arc status;
+            // 2. Notify arc status to audio service.
+            notifyArcStatusToAudioService(enabled);
+            // 3. Update arc status;
             mArcStatusEnabled = enabled;
             return oldStatus;
         }
     }
 
+    private void notifyArcStatusToAudioService(boolean enabled) {
+        // Note that we don't set any name to ARC.
+        mService.getAudioManager().setWiredDeviceConnectionState(
+                AudioSystem.DEVICE_OUT_HDMI_ARC,
+                enabled ? 1 : 0, "");
+    }
+
     /**
      * Returns whether ARC is enabled or not.
      */
@@ -613,7 +619,6 @@ final class HdmiCecLocalDeviceTv extends HdmiCecLocalDevice {
     @ServiceThreadOnly
     void onHotplug(int portNo, boolean connected) {
         assertRunOnServiceThread();
-        // TODO: delegate onHotplug event to each local device.
 
         // Tv device will have permanent HotplugDetectionAction.
         List<HotplugDetectionAction> hotplugActions = getActions(HotplugDetectionAction.class);
@@ -623,10 +628,4 @@ final class HdmiCecLocalDeviceTv extends HdmiCecLocalDevice {
             hotplugActions.get(0).pollAllDevicesNow();
         }
     }
-
-    boolean canChangeSystemAudio() {
-        // TODO: implement this.
-        // return true if no system audio control sequence is running.
-        return false;
-    }
 }

services/core/java/com/android/server/hdmi/HdmiControlService.java

@@ -28,6 +28,7 @@ import android.hardware.hdmi.IHdmiControlService;
 import android.hardware.hdmi.IHdmiDeviceEventListener;
 import android.hardware.hdmi.IHdmiHotplugEventListener;
 import android.hardware.hdmi.IHdmiSystemAudioModeChangeListener;
+import android.media.AudioManager;
 import android.os.Build;
 import android.os.Handler;
 import android.os.HandlerThread;
@@ -870,4 +871,8 @@ public final class HdmiControlService extends SystemService {
     private HdmiCecLocalDevicePlayback playback() {
         return (HdmiCecLocalDevicePlayback) mCecController.getLocalDevice(HdmiCec.DEVICE_PLAYBACK);
     }
+
+    AudioManager getAudioManager() {
+        return (AudioManager) getContext().getSystemService(Context.AUDIO_SERVICE);
+    }
 }

services/core/java/com/android/server/hdmi/SystemAudioAutoInitiationAction.java

@@ -115,6 +115,7 @@ final class SystemAudioAutoInitiationAction extends FeatureAction {
     }
 
     private boolean canChangeSystemAudio() {
-        return tv().canChangeSystemAudio();
+        return !(tv().hasAction(SystemAudioActionFromTv.class)
+               || tv().hasAction(SystemAudioActionFromAvr.class));
     }
 }