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, 21 insertions, 1 deletions

diff --git a/media/libmedia/IAudioPolicyServiceClient.cpp b/media/libmedia/IAudioPolicyServiceClient.cpp
index 65cc7d6..d6207ce 100644
--- a/media/libmedia/IAudioPolicyServiceClient.cpp
+++ b/media/libmedia/IAudioPolicyServiceClient.cpp
@@ -30,7 +30,8 @@ namespace android {
 enum {
     PORT_LIST_UPDATE = IBinder::FIRST_CALL_TRANSACTION,
     PATCH_LIST_UPDATE,
-    MIX_STATE_UPDATE
+    MIX_STATE_UPDATE,
+    OUTPUT_SESSION_EFFECTS_UPDATE
 };
 
 class BpAudioPolicyServiceClient : public BpInterface<IAudioPolicyServiceClient>
@@ -63,6 +64,17 @@ public:
         data.writeInt32(state);
         remote()->transact(MIX_STATE_UPDATE, data, &reply, IBinder::FLAG_ONEWAY);
     }
+
+    void onOutputSessionEffectsUpdate(audio_stream_type_t stream,
+                                      audio_unique_id_t sessionId, bool added)
+    {
+        Parcel data, reply;
+        data.writeInterfaceToken(IAudioPolicyServiceClient::getInterfaceDescriptor());
+        data.writeInt32(stream);
+        data.writeInt32(sessionId);
+        data.writeInt32(added ? 1 : 0);
+        remote()->transact(OUTPUT_SESSION_EFFECTS_UPDATE, data, &reply, IBinder::FLAG_ONEWAY);
+    }
 };
 
 IMPLEMENT_META_INTERFACE(AudioPolicyServiceClient, "android.media.IAudioPolicyServiceClient");
@@ -90,6 +102,14 @@ status_t BnAudioPolicyServiceClient::onTransact(
             onDynamicPolicyMixStateUpdate(regId, state);
             return NO_ERROR;
     }
+    case OUTPUT_SESSION_EFFECTS_UPDATE: {
+            CHECK_INTERFACE(IAudioPolicyServiceClient, data, reply);
+            audio_stream_type_t stream = static_cast<audio_stream_type_t>(data.readInt32());
+            audio_unique_id_t sessionId = static_cast<audio_unique_id_t>(data.readInt32());
+            bool added = data.readInt32() > 0;
+            onOutputSessionEffectsUpdate(stream, sessionId, added);
+            return NO_ERROR;
+    }
     default:
         return BBinder::onTransact(code, data, reply, flags);
     }