diff --git a/audio/aidl/default/EffectThread.cpp b/audio/aidl/default/EffectThread.cpp
index b515385..1a52c13 100644
--- a/audio/aidl/default/EffectThread.cpp
+++ b/audio/aidl/default/EffectThread.cpp
@@ -68,7 +68,11 @@
 RetCode EffectThread::startThread() {
     {
         std::lock_guard lg(mThreadMutex);
-        mStop = false;
+        if (mDraining) {
+            mDraining = false;
+        } else {
+            mStop = false;
+        }
         mCv.notify_one();
     }
 
@@ -87,6 +91,25 @@
     return RetCode::SUCCESS;
 }
 
+RetCode EffectThread::startDraining() {
+    std::lock_guard lg(mThreadMutex);
+    mDraining = true;
+    mCv.notify_one();
+
+    LOG(VERBOSE) << mName << __func__;
+    return RetCode::SUCCESS;
+}
+
+RetCode EffectThread::finishDraining() {
+    std::lock_guard lg(mThreadMutex);
+    mDraining = false;
+    mStop = true;
+    mCv.notify_one();
+
+    LOG(VERBOSE) << mName << __func__;
+    return RetCode::SUCCESS;
+}
+
 void EffectThread::threadLoop() {
     pthread_setname_np(pthread_self(), mName.substr(0, kMaxTaskNameLen - 1).c_str());
     setpriority(PRIO_PROCESS, 0, mPriority);