diff --git a/services/oboeservice/AAudioServiceStreamBase.h b/services/oboeservice/AAudioServiceStreamBase.h
index dddd69f..b2ba725 100644
--- a/services/oboeservice/AAudioServiceStreamBase.h
+++ b/services/oboeservice/AAudioServiceStreamBase.h
@@ -116,6 +116,11 @@
      */
     aaudio_result_t flush() EXCLUDES(mLock);
 
+    /**
+     * Exit standby mode. The MMAP buffer will be reallocated.
+     */
+    aaudio_result_t exitStandby(AudioEndpointParcelable *parcelable) EXCLUDES(mLock);
+
     virtual aaudio_result_t startClient(const android::AudioClient& client,
                                         const audio_attributes_t *attr __unused,
                                         audio_port_handle_t *clientHandle __unused) {
@@ -314,6 +319,33 @@
         mDisconnected = flag;
     }
 
+    virtual aaudio_result_t standby_l() REQUIRES(mLock) {
+        return AAUDIO_ERROR_UNAVAILABLE;
+    }
+    class ExitStandbyParam : public AAudioCommandParam {
+    public:
+        ExitStandbyParam(AudioEndpointParcelable* parcelable)
+                : AAudioCommandParam(), mParcelable(parcelable) { }
+        ~ExitStandbyParam() = default;
+
+        AudioEndpointParcelable* mParcelable;
+    };
+    virtual aaudio_result_t exitStandby_l(
+            AudioEndpointParcelable* parcelable __unused) REQUIRES(mLock) {
+        return AAUDIO_ERROR_UNAVAILABLE;
+    }
+    bool isStandby_l() const REQUIRES(mLock) {
+        return mStandby;
+    }
+    void setStandby_l(bool standby) REQUIRES(mLock) {
+        mStandby = standby;
+    }
+
+    bool isIdle_l() const REQUIRES(mLock) {
+        return mState == AAUDIO_STREAM_STATE_OPEN || mState == AAUDIO_STREAM_STATE_PAUSED
+                || mState == AAUDIO_STREAM_STATE_STOPPED;
+    }
+
     pid_t                   mRegisteredClientThread = ILLEGAL_THREAD_ID;
 
     std::mutex              mUpMessageQueueLock;
@@ -329,6 +361,7 @@
         REGISTER_AUDIO_THREAD,
         UNREGISTER_AUDIO_THREAD,
         GET_DESCRIPTION,
+        EXIT_STANDBY,
     };
     AAudioThread            mCommandThread;
     std::atomic<bool>       mThreadEnabled{false};
@@ -391,6 +424,8 @@
 
     bool                    mDisconnected GUARDED_BY(mLock) {false};
 
+    bool                    mStandby GUARDED_BY(mLock) = false;
+
 protected:
     // Locking order is important.
     // Acquire mLock before acquiring AAudioServiceEndpoint::mLockStreams