Add broadcast and query API for AudioSource.HOTWORD.

- When the AudioSource.HOTWORD input becomes active or is released, send
  a Broadcast with the package name and the new state of the audio input
  to any applications that hold CAPTURE_AUDIO_OUTPUT.
- Store the package name of the application that controls the hOTWORD
  input or set it to null if the input is not in use.
- Add a new method to AudioService to retrieve the package name of the
  application that currently controls the HOTWORD input.

Change-Id: I2f11888f3711d23b6287a4de7b81d361734a8f3b

2 files changed, 24 insertions, 0 deletions

diff --git a/media/java/android/media/AudioRecord.java b/media/java/android/media/AudioRecord.java
index 27cc220..c1ca2b0 100644
--- a/media/java/android/media/AudioRecord.java
+++ b/media/java/android/media/AudioRecord.java
@@ -903,6 +903,11 @@ public class AudioRecord
                 mRecordingState = RECORDSTATE_RECORDING;
             }
         }
+
+        if (getRecordingState() == RECORDSTATE_RECORDING &&
+                getAudioSource() == MediaRecorder.AudioSource.HOTWORD) {
+            handleHotwordInput(true);
+        }
     }
 
     /**
@@ -946,6 +951,10 @@ public class AudioRecord
             native_stop();
             mRecordingState = RECORDSTATE_STOPPED;
         }
+
+        if (getAudioSource() == MediaRecorder.AudioSource.HOTWORD) {
+            handleHotwordInput(false);
+        }
     }
 
     private final IBinder mICallBack = new Binder();
@@ -962,6 +971,16 @@ public class AudioRecord
         }
     }
 
+    private void handleHotwordInput(boolean listening) {
+        final IBinder b = ServiceManager.getService(android.content.Context.AUDIO_SERVICE);
+        final IAudioService ias = IAudioService.Stub.asInterface(b);
+        try {
+            ias.handleHotwordInput(listening);
+        } catch (RemoteException e) {
+            Log.e(TAG, "Error talking to AudioService when handling hotword input.", e);
+        }
+    }
+
     //---------------------------------------------------------
     // Audio data supply
     //--------------------
diff --git a/media/java/android/media/IAudioService.aidl b/media/java/android/media/IAudioService.aidl
index 0b98e1b..cdcd83c 100644
--- a/media/java/android/media/IAudioService.aidl
+++ b/media/java/android/media/IAudioService.aidl
@@ -227,4 +227,9 @@ interface IAudioService {
     void addMediaPlayerAndUpdateRemoteController(String packageName);
 
     void removeMediaPlayerAndUpdateRemoteController(String packageName);
+
+    void handleHotwordInput(boolean listening);
+
+    String getCurrentHotwordInputPackageName();
+
 }