diff --git a/media/libmedia/IAudioPolicyService.cpp b/media/libmedia/IAudioPolicyService.cpp
index 76b5924..c95d4c4 100644
--- a/media/libmedia/IAudioPolicyService.cpp
+++ b/media/libmedia/IAudioPolicyService.cpp
@@ -74,6 +74,8 @@
     START_AUDIO_SOURCE,
     STOP_AUDIO_SOURCE,
     SET_AUDIO_PORT_CALLBACK_ENABLED,
+    SET_MASTER_MONO,
+    GET_MASTER_MONO,
 };
 
 #define MAX_ITEMS_PER_LIST 1024
@@ -767,6 +769,37 @@
         status = (status_t)reply.readInt32();
         return status;
     }
+
+    virtual status_t setMasterMono(bool mono)
+    {
+        Parcel data, reply;
+        data.writeInterfaceToken(IAudioPolicyService::getInterfaceDescriptor());
+        data.writeInt32(static_cast<int32_t>(mono));
+        status_t status = remote()->transact(SET_MASTER_MONO, data, &reply);
+        if (status != NO_ERROR) {
+            return status;
+        }
+        return static_cast<status_t>(reply.readInt32());
+    }
+
+    virtual status_t getMasterMono(bool *mono)
+    {
+        if (mono == nullptr) {
+            return BAD_VALUE;
+        }
+        Parcel data, reply;
+        data.writeInterfaceToken(IAudioPolicyService::getInterfaceDescriptor());
+
+        status_t status = remote()->transact(GET_MASTER_MONO, data, &reply);
+        if (status != NO_ERROR) {
+            return status;
+        }
+        status = static_cast<status_t>(reply.readInt32());
+        if (status == NO_ERROR) {
+            *mono = static_cast<bool>(reply.readInt32());
+        }
+        return status;
+    }
 };
 
 IMPLEMENT_META_INTERFACE(AudioPolicyService, "android.media.IAudioPolicyService");
@@ -1311,6 +1344,25 @@
             return NO_ERROR;
         } break;
 
+        case SET_MASTER_MONO: {
+            CHECK_INTERFACE(IAudioPolicyService, data, reply);
+            bool mono = static_cast<bool>(data.readInt32());
+            status_t status = setMasterMono(mono);
+            reply->writeInt32(status);
+            return NO_ERROR;
+        } break;
+
+        case GET_MASTER_MONO: {
+            CHECK_INTERFACE(IAudioPolicyService, data, reply);
+            bool mono;
+            status_t status = getMasterMono(&mono);
+            reply->writeInt32(status);
+            if (status == NO_ERROR) {
+                reply->writeInt32(static_cast<int32_t>(mono));
+            }
+            return NO_ERROR;
+        } break;
+
         default:
             return BBinder::onTransact(code, data, reply, flags);
     }