Audio policy manager changes for audio effects

Added methods for audio effects management by audio policy manager.
- control of total CPU load and memory used by effect engines
- selection of output stream for global effects
- added audio session id in parameter list for startOutput() and stopOutput().
this is not used in default audio policy manager implementation.

Modifications of audio effect framework in AudioFlinger to allow moving and reconfiguring
effect engines from one output mixer thread to another when audio tracks in the same session
are moved or when requested by audio policy manager.
Also fixed mutex deadlock problem with effect chains locks.

Change-Id: Ida43484b06e9b890d6b9e53c13958d042720ebdb

1 files changed, 21 insertions, 1 deletions

diff --git a/media/libmedia/IAudioFlinger.cpp b/media/libmedia/IAudioFlinger.cpp
index 7d6a5d3..3a89e25 100644
--- a/media/libmedia/IAudioFlinger.cpp
+++ b/media/libmedia/IAudioFlinger.cpp
@@ -69,7 +69,8 @@ enum {
     QUERY_NUM_EFFECTS,
     QUERY_EFFECT,
     GET_EFFECT_DESCRIPTOR,
-    CREATE_EFFECT
+    CREATE_EFFECT,
+    MOVE_EFFECTS
 };
 
 class BpAudioFlinger : public BpInterface<IAudioFlinger>
@@ -676,6 +677,17 @@ public:
 
         return effect;
     }
+
+    virtual status_t moveEffects(int session, int srcOutput, int dstOutput)
+    {
+        Parcel data, reply;
+        data.writeInterfaceToken(IAudioFlinger::getInterfaceDescriptor());
+        data.writeInt32(session);
+        data.writeInt32(srcOutput);
+        data.writeInt32(dstOutput);
+        remote()->transact(MOVE_EFFECTS, data, &reply);
+        return reply.readInt32();
+    }
 };
 
 IMPLEMENT_META_INTERFACE(AudioFlinger, "android.media.IAudioFlinger");
@@ -1024,6 +1036,14 @@ status_t BnAudioFlinger::onTransact(
             reply->write(&desc, sizeof(effect_descriptor_t));
             return NO_ERROR;
         } break;
+        case MOVE_EFFECTS: {
+            CHECK_INTERFACE(IAudioFlinger, data, reply);
+            int session = data.readInt32();
+            int srcOutput = data.readInt32();
+            int dstOutput = data.readInt32();
+            reply->writeInt32(moveEffects(session, srcOutput, dstOutput));
+            return NO_ERROR;
+        } break;
         default:
             return BBinder::onTransact(code, data, reply, flags);
     }