audiopolicy: Add notification when default effects are updated

 * In M, we now have the ability to define a default set of audio effect
   on a per-stream basis. This allows us to get around the problem of
   apps not sending the control intents so we can implement smart
   global effects for specific media types.
 * We still need a session id in order to get a handle and configure them
   from an app like AudioFX, so we'll need to add some plumbing in
   order to send an event to interested applications.
 * This patch implements the native side of this. The Java layer will
   call down thru AudioSystem and register a callback which will be
   invoked by the audio policy when default effects are updated on
   a stream. This callback will receive both the stream type as well
   as the session id.
 * Attaching this listener requires that the caller hold the
   MODIFY_AUDIO_ROUTING permission.

Change-Id: I142b15f2585ffca6a953c3e828e2a7c07b24f56c

1 files changed, 5 insertions, 1 deletions

diff --git a/services/audiopolicy/service/AudioPolicyEffects.h b/services/audiopolicy/service/AudioPolicyEffects.h
index 3845050..2023784 100644
--- a/services/audiopolicy/service/AudioPolicyEffects.h
+++ b/services/audiopolicy/service/AudioPolicyEffects.h
@@ -31,6 +31,8 @@
 
 namespace android {
 
+class AudioPolicyService;
+
 // ----------------------------------------------------------------------------
 
 // AudioPolicyEffects class
@@ -44,7 +46,7 @@ public:
     // The constructor will parse audio_effects.conf
     // First it will look whether vendor specific file exists,
     // otherwise it will parse the system default file.
-	         AudioPolicyEffects();
+	         AudioPolicyEffects(AudioPolicyService *audioPolicyService);
     virtual ~AudioPolicyEffects();
 
     // NOTE: methods on AudioPolicyEffects should never be called with the AudioPolicyService
@@ -192,6 +194,8 @@ private:
     KeyedVector< audio_stream_type_t, EffectDescVector* > mOutputStreams;
     // Automatic output effects are unique for audiosession ID
     KeyedVector< int32_t, EffectVector* > mOutputSessions;
+
+    AudioPolicyService *mAudioPolicyService;
 };
 
 }; // namespace android