diff --git a/media/libaudiohal/impl/Android.bp b/media/libaudiohal/impl/Android.bp
index a2c6e8a..d6576f5 100644
--- a/media/libaudiohal/impl/Android.bp
+++ b/media/libaudiohal/impl/Android.bp
@@ -50,6 +50,7 @@
         "libmedia_helper",
         "libmediautils",
         "libutils",
+        "audioclient-types-aidl-cpp",
     ],
     header_libs: [
         "android.hardware.audio.common.util@all-versions",
diff --git a/media/libaudiohal/impl/DeviceHalHidl.cpp b/media/libaudiohal/impl/DeviceHalHidl.cpp
index aa94eea..47acb19 100644
--- a/media/libaudiohal/impl/DeviceHalHidl.cpp
+++ b/media/libaudiohal/impl/DeviceHalHidl.cpp
@@ -20,6 +20,7 @@
 //#define LOG_NDEBUG 0
 
 #include <cutils/native_handle.h>
+#include <cutils/properties.h>
 #include <hwbinder/IPCThreadState.h>
 #include <media/AudioContainers.h>
 #include <utils/Log.h>
diff --git a/media/libaudiohal/impl/DeviceHalHidl.h b/media/libaudiohal/impl/DeviceHalHidl.h
index 2694ab3..7b4dd88 100644
--- a/media/libaudiohal/impl/DeviceHalHidl.h
+++ b/media/libaudiohal/impl/DeviceHalHidl.h
@@ -119,6 +119,13 @@
     status_t addDeviceEffect(audio_port_handle_t device, sp<EffectHalInterface> effect) override;
     status_t removeDeviceEffect(audio_port_handle_t device, sp<EffectHalInterface> effect) override;
 
+    status_t getMmapPolicyInfos(
+            media::AudioMMapPolicyType policyType __unused,
+            std::vector<media::AudioMMapPolicyInfo> *policyInfos __unused) override {
+        // TODO: Implement the HAL query when moving to AIDL HAL.
+        return INVALID_OPERATION;
+    }
+
     status_t dump(int fd, const Vector<String16>& args) override;
 
   private:
diff --git a/media/libaudiohal/impl/DeviceHalLocal.h b/media/libaudiohal/impl/DeviceHalLocal.h
index 2fde936..d4bb7a0 100644
--- a/media/libaudiohal/impl/DeviceHalLocal.h
+++ b/media/libaudiohal/impl/DeviceHalLocal.h
@@ -112,6 +112,13 @@
     status_t addDeviceEffect(audio_port_handle_t device, sp<EffectHalInterface> effect) override;
     status_t removeDeviceEffect(audio_port_handle_t device, sp<EffectHalInterface> effect) override;
 
+    status_t getMmapPolicyInfos(
+            media::AudioMMapPolicyType policyType __unused,
+            std::vector<media::AudioMMapPolicyInfo> *policyInfos __unused) override {
+        // This function will only be available on AIDL HAL.
+        return INVALID_OPERATION;
+    }
+
     status_t dump(int fd, const Vector<String16>& args) override;
 
     void closeOutputStream(struct audio_stream_out *stream_out);
diff --git a/media/libaudiohal/impl/DevicesFactoryHalHidl.h b/media/libaudiohal/impl/DevicesFactoryHalHidl.h
index 6f84efe..b46259b 100644
--- a/media/libaudiohal/impl/DevicesFactoryHalHidl.h
+++ b/media/libaudiohal/impl/DevicesFactoryHalHidl.h
@@ -46,6 +46,8 @@
 
     status_t setCallbackOnce(sp<DevicesFactoryHalCallback> callback) override;
 
+    float getHalVersion() const override { return MAJOR_VERSION + (float)MINOR_VERSION / 10; }
+
   private:
     friend class ServiceNotificationListener;
     void addDeviceFactory(sp<IDevicesFactory> factory, bool needToNotify);
diff --git a/media/libaudiohal/impl/DevicesFactoryHalHybrid.h b/media/libaudiohal/impl/DevicesFactoryHalHybrid.h
index 568a1fb..5baefa4b 100644
--- a/media/libaudiohal/impl/DevicesFactoryHalHybrid.h
+++ b/media/libaudiohal/impl/DevicesFactoryHalHybrid.h
@@ -40,6 +40,10 @@
 
             status_t setCallbackOnce(sp<DevicesFactoryHalCallback> callback) override;
 
+            float getHalVersion() const override {
+                return MAJOR_VERSION + (float)MINOR_VERSION / 10;
+            }
+
   private:
     sp<DevicesFactoryHalInterface> mLocalFactory;
     sp<DevicesFactoryHalInterface> mHidlFactory;
diff --git a/media/libaudiohal/impl/DevicesFactoryHalLocal.h b/media/libaudiohal/impl/DevicesFactoryHalLocal.h
index 32bf362..d2b9104 100644
--- a/media/libaudiohal/impl/DevicesFactoryHalLocal.h
+++ b/media/libaudiohal/impl/DevicesFactoryHalLocal.h
@@ -41,6 +41,10 @@
                 return INVALID_OPERATION;
             }
 
+            float getHalVersion() const override {
+                return MAJOR_VERSION + (float)MINOR_VERSION / 10;
+            }
+
   private:
     friend class DevicesFactoryHalHybrid;