reduce number of binder calls from mediaserver

Reduce the number of audio port, audio patch and
IO config changed binder calls from mediaserver to
client processes:
- Do not call IO config changed callback if selected
device is the same as previously selected one on a given
audio flinger playback or capture thread.
- Do not call the audio port or audo patch list update
callback on a client if this client as no listener registered.

Bug: 22045560.

Change-Id: If780e105404de79b7cb5c80c27b793ceb6b1c423

1 files changed, 16 insertions, 1 deletions

diff --git a/media/libmedia/IAudioPolicyService.cpp b/media/libmedia/IAudioPolicyService.cpp
index fd18f17..3348441 100644
--- a/media/libmedia/IAudioPolicyService.cpp
+++ b/media/libmedia/IAudioPolicyService.cpp
@@ -72,7 +72,8 @@ enum {
     GET_PHONE_STATE,
     REGISTER_POLICY_MIXES,
     START_AUDIO_SOURCE,
-    STOP_AUDIO_SOURCE
+    STOP_AUDIO_SOURCE,
+    SET_AUDIO_PORT_CALLBACK_ENABLED,
 };
 
 #define MAX_ITEMS_PER_LIST 1024
@@ -646,6 +647,14 @@ public:
         remote()->transact(REGISTER_CLIENT, data, &reply);
     }
 
+    virtual void setAudioPortCallbacksEnabled(bool enabled)
+    {
+        Parcel data, reply;
+        data.writeInterfaceToken(IAudioPolicyService::getInterfaceDescriptor());
+        data.writeInt32(enabled ? 1 : 0);
+        remote()->transact(SET_AUDIO_PORT_CALLBACK_ENABLED, data, &reply);
+    }
+
     virtual status_t acquireSoundTriggerSession(audio_session_t *session,
                                             audio_io_handle_t *ioHandle,
                                             audio_devices_t *device)
@@ -1219,6 +1228,12 @@ status_t BnAudioPolicyService::onTransact(
             return NO_ERROR;
         } break;
 
+        case SET_AUDIO_PORT_CALLBACK_ENABLED: {
+            CHECK_INTERFACE(IAudioPolicyService, data, reply);
+            setAudioPortCallbacksEnabled(data.readInt32() == 1);
+            return NO_ERROR;
+        } break;
+
         case ACQUIRE_SOUNDTRIGGER_SESSION: {
             CHECK_INTERFACE(IAudioPolicyService, data, reply);
             sp<IAudioPolicyServiceClient> client = interface_cast<IAudioPolicyServiceClient>(