Indicate screen off condition to audio framework.

Add a mechanism for AudioService to notify audio framework and audio HAL
that screen is turned on or off. This indication can be used by lower
audio layers to trigger low power audio playback mode.
Current implementaiton based on setParameters() method is experimental
and will be replaced by a different interface when ready.

Change-Id: Ie72ada0a8edec3d71b47681b9f51cb5bc839d45b

1 files changed, 6 insertions, 0 deletions

diff --git a/media/java/android/media/AudioService.java b/media/java/android/media/AudioService.java
index 0c5e673..e0c2b3b 100644
--- a/media/java/android/media/AudioService.java
+++ b/media/java/android/media/AudioService.java
@@ -368,6 +368,8 @@ public class AudioService extends IAudioService.Stub {
         intentFilter.addAction(Intent.ACTION_USB_DGTL_HEADSET_PLUG);
         intentFilter.addAction(Intent.ACTION_HDMI_AUDIO_PLUG);
         intentFilter.addAction(Intent.ACTION_BOOT_COMPLETED);
+        intentFilter.addAction(Intent.ACTION_SCREEN_ON);
+        intentFilter.addAction(Intent.ACTION_SCREEN_OFF);
         context.registerReceiver(mReceiver, intentFilter);
 
         // Register for package removal intent broadcasts for media button receiver persistence
@@ -2565,6 +2567,10 @@ public class AudioService extends IAudioService.Stub {
                         removeMediaButtonReceiverForPackage(packageName);
                     }
                 }
+            } else if (action.equals(Intent.ACTION_SCREEN_ON)) {
+                AudioSystem.setParameters("screen_state=on");
+            } else if (action.equals(Intent.ACTION_SCREEN_OFF)) {
+                AudioSystem.setParameters("screen_state=off");
             }
         }
     }