audio policy: split audio policy library

Split audio policy library into a service part and a policy part.
This will allow OEMs to customize the policy part:
- libaudiopolicyservice for the service.
- libaudiopolicymanager for the policy.

Two build options can be defined in device make file to select
the policy library:
- USE_LEGACY_AUDIO_POLICY = 1: this will use the legacy policy
in hardware/libhardware_legacy implemented by AudioPolicyManagerBase class.
This policy is loaded as a harware module and exposes the audio policy HAL
defined in include/hardware/audio_policy.h and is in a library called
audio_policy.XXX.so (e.g audio_policy.default.so)

The legacy HAL will not be updated with new features.

If USE_LEGACY_AUDIO_POLICY is not defined, the policy is implemented by
a class named AudioPolicyManager exposing an interface defined in
AudioPolicyInterface.h.
The corresponding library is libaudiopolicymanager.so.

New features will be added only to AudioPolicyInterface.h

The default implementation is provided here in file AudioPolicyManager.cpp

OEMs wanting to cutomize the policy can implement the AudioPolicyManager class
and provide the libaudiopolicymanager.so library.
In this case the device make file should define:
- USE_CUSTOM_AUDIO_POLICY = 1

For now, USE_LEGACY_AUDIO_POLICY = 1 is forced in audio policy service make file.
This will be removed when the new audio policy is enabled.

Change-Id: I066799dacc9b182b468a43d48ff7798c9109a414

CleanSpec.mk

@@ -51,6 +51,8 @@ $(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj/SHARED_LIBRARIES/libaudioflinge
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/lib/libaudioflinger.so)
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj/SHARED_LIBRARIES/libaudiopolicy_intermediates)
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/lib/libaudiopolicy.so)
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj/SHARED_LIBRARIES/libaudiopolicy_intermediates)
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/lib/libaudiopolicy.so)
 
 # ************************************************
 # NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST

media/mediaserver/Android.mk

@@ -15,7 +15,7 @@ LOCAL_SRC_FILES:= \
 
 LOCAL_SHARED_LIBRARIES := \
 	libaudioflinger \
-	libaudiopolicy \
+	libaudiopolicyservice \
 	libcamera_metadata\
 	libcameraservice \
 	libmedialogservice \

services/audiopolicy/Android.mk

@@ -5,7 +5,9 @@ include $(CLEAR_VARS)
 LOCAL_SRC_FILES:= \
     AudioPolicyService.cpp
 
+# TODO: remove when enabling new audio policy
 USE_LEGACY_AUDIO_POLICY = 1
+
 ifeq ($(USE_LEGACY_AUDIO_POLICY), 1)
 LOCAL_SRC_FILES += \
     AudioPolicyInterfaceImplLegacy.cpp \
@@ -15,8 +17,7 @@ LOCAL_SRC_FILES += \
 else
 LOCAL_SRC_FILES += \
     AudioPolicyInterfaceImpl.cpp \
-    AudioPolicyClientImpl.cpp \
-    AudioPolicyManager.cpp
+    AudioPolicyClientImpl.cpp
 endif
 
 LOCAL_C_INCLUDES := \
@@ -31,14 +32,42 @@ LOCAL_SHARED_LIBRARIES := \
     libbinder \
     libmedia \
     libhardware \
-    libhardware_legacy
+    libhardware_legacy \
+
+ifneq ($(USE_LEGACY_AUDIO_POLICY), 1)
+LOCAL_SHARED_LIBRARIES += \
+    libaudiopolicymanager
+endif
 
 LOCAL_STATIC_LIBRARIES := \
     libmedia_helper \
     libserviceutility
 
-LOCAL_MODULE:= libaudiopolicy
+LOCAL_MODULE:= libaudiopolicyservice
 
 LOCAL_CFLAGS += -fvisibility=hidden
 
 include $(BUILD_SHARED_LIBRARY)
+
+ifneq ($(USE_LEGACY_AUDIO_POLICY), 1)
+ifneq ($(USE_CUSTOM_AUDIO_POLICY), 1)
+
+include $(CLEAR_VARS)
+
+LOCAL_SRC_FILES:= \
+    AudioPolicyManager.cpp
+
+LOCAL_SHARED_LIBRARIES := \
+    libcutils \
+    libutils \
+    liblog
+
+LOCAL_STATIC_LIBRARIES := \
+    libmedia_helper
+
+LOCAL_MODULE:= libaudiopolicymanager
+
+include $(BUILD_SHARED_LIBRARY)
+
+endif
+endif