diff --git a/audio/aidl/default/EffectContext.cpp b/audio/aidl/default/EffectContext.cpp
index 26c88b2..b354dd1 100644
--- a/audio/aidl/default/EffectContext.cpp
+++ b/audio/aidl/default/EffectContext.cpp
@@ -258,4 +258,18 @@
     return RetCode::SUCCESS;
 }
 
+RetCode EffectContext::startDraining() {
+    mIsDraining = true;
+    return RetCode::SUCCESS;
+}
+
+RetCode EffectContext::finishDraining() {
+    mIsDraining = false;
+    return RetCode::SUCCESS;
+}
+
+bool EffectContext::isDraining() {
+    return mIsDraining;
+}
+
 }  // namespace aidl::android::hardware::audio::effect
diff --git a/audio/aidl/default/EffectImpl.cpp b/audio/aidl/default/EffectImpl.cpp
index 3e61335..7857f53 100644
--- a/audio/aidl/default/EffectImpl.cpp
+++ b/audio/aidl/default/EffectImpl.cpp
@@ -79,7 +79,6 @@
     std::lock_guard lg(mImplMutex);
     RETURN_IF(mState == State::INIT, EX_ILLEGAL_STATE, "alreadyClosed");
 
-    // TODO: b/302036943 add reopen implementation
     RETURN_IF(!mImplContext, EX_NULL_POINTER, "nullContext");
     mImplContext->dupeFmqWithReopen(ret);
     return ndk::ScopedAStatus::ok();
@@ -347,7 +346,7 @@
 
     {
         std::lock_guard lg(mImplMutex);
-        if (mState != State::PROCESSING) {
+        if (mState != State::PROCESSING && mState != State::DRAINING) {
             LOG(DEBUG) << getEffectNameWithVersion()
                        << " skip process in state: " << toString(mState);
             return;
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);
diff --git a/audio/aidl/default/audio_effects_config.xml b/audio/aidl/default/audio_effects_config.xml
index 2cef9eb..2e860d8 100644
--- a/audio/aidl/default/audio_effects_config.xml
+++ b/audio/aidl/default/audio_effects_config.xml
@@ -76,6 +76,7 @@
         <effect name="bassboost" library="bundle" uuid="8631f300-72e2-11df-b57e-0002a5d5c51b"/>
         <effect name="downmix" library="downmix" uuid="93f04452-e4fe-41cc-91f9-e475b6d1d69f"/>
         <effect name="dynamics_processing" library="dynamics_processing" uuid="e0e6539b-1781-7261-676f-6d7573696340"/>
+        <effect name="eraser" library="erasersw" uuid="fa81ab46-588b-11ed-9b6a-0242ac120002"/>
         <effect name="haptic_generator" library="haptic_generator" uuid="97c4acd1-8b82-4f2f-832e-c2fe5d7a9931"/>
         <effect name="loudness_enhancer" library="loudness_enhancer" uuid="fa415329-2034-4bea-b5dc-5b381c8d1e2c"/>
         <effect name="reverb_env_aux" library="reverb" uuid="4a387fc0-8ab3-11df-8bad-0002a5d5c51b"/>
diff --git a/audio/aidl/default/eraser/Eraser.cpp b/audio/aidl/default/eraser/Eraser.cpp
index 157ec79..59cc9a2 100644
--- a/audio/aidl/default/eraser/Eraser.cpp
+++ b/audio/aidl/default/eraser/Eraser.cpp
@@ -133,10 +133,70 @@
     LOG(DEBUG) << __func__;
 }
 
+ndk::ScopedAStatus EraserSw::command(CommandId command) {
+    std::lock_guard lg(mImplMutex);
+    RETURN_IF(mState == State::INIT, EX_ILLEGAL_STATE, "instanceNotOpen");
+
+    switch (command) {
+        case CommandId::START:
+            RETURN_OK_IF(mState == State::PROCESSING);
+            mState = State::PROCESSING;
+            mContext->enable();
+            startThread();
+            RETURN_IF(notifyEventFlag(mDataMqNotEmptyEf) != RetCode::SUCCESS, EX_ILLEGAL_STATE,
+                      "notifyEventFlagNotEmptyFailed");
+            break;
+        case CommandId::STOP:
+            RETURN_OK_IF(mState == State::IDLE || mState == State::DRAINING);
+            if (mVersion < kDrainSupportedVersion) {
+                mState = State::IDLE;
+                stopThread();
+                mContext->disable();
+            } else {
+                mState = State::DRAINING;
+                startDraining();
+                mContext->startDraining();
+            }
+            RETURN_IF(notifyEventFlag(mDataMqNotEmptyEf) != RetCode::SUCCESS, EX_ILLEGAL_STATE,
+                      "notifyEventFlagNotEmptyFailed");
+            break;
+        case CommandId::RESET:
+            mState = State::IDLE;
+            RETURN_IF(notifyEventFlag(mDataMqNotEmptyEf) != RetCode::SUCCESS, EX_ILLEGAL_STATE,
+                      "notifyEventFlagNotEmptyFailed");
+            stopThread();
+            mImplContext->disable();
+            mImplContext->reset();
+            mImplContext->resetBuffer();
+            break;
+        default:
+            LOG(ERROR) << getEffectNameWithVersion() << __func__ << " instance still processing";
+            return ndk::ScopedAStatus::fromExceptionCodeWithMessage(EX_ILLEGAL_ARGUMENT,
+                                                                    "CommandIdNotSupported");
+    }
+    LOG(VERBOSE) << getEffectNameWithVersion() << __func__
+                 << " transfer to state: " << toString(mState);
+    return ndk::ScopedAStatus::ok();
+}
+
 // Processing method running in EffectWorker thread.
 IEffect::Status EraserSw::effectProcessImpl(float* in, float* out, int samples) {
     RETURN_VALUE_IF(!mContext, (IEffect::Status{EX_NULL_POINTER, 0, 0}), "nullContext");
-    return mContext->process(in, out, samples);
+    IEffect::Status procStatus{STATUS_NOT_ENOUGH_DATA, 0, 0};
+    procStatus = mContext->process(in, out, samples);
+    if (mState == State::DRAINING && procStatus.status == STATUS_NOT_ENOUGH_DATA) {
+        drainingComplete_l();
+    }
+
+    return procStatus;
+}
+
+void EraserSw::drainingComplete_l() {
+    if (mState != State::DRAINING) return;
+
+    LOG(DEBUG) << getEffectNameWithVersion() << __func__;
+    finishDraining();
+    mState = State::IDLE;
 }
 
 EraserSwContext::EraserSwContext(int statusDepth, const Parameter::Common& common)
@@ -164,24 +224,47 @@
 
 IEffect::Status EraserSwContext::process(float* in, float* out, int samples) {
     LOG(DEBUG) << __func__ << " in " << in << " out " << out << " samples " << samples;
-    IEffect::Status status = {EX_ILLEGAL_ARGUMENT, 0, 0};
-
+    IEffect::Status procStatus = {EX_ILLEGAL_ARGUMENT, 0, 0};
     const auto inputChannelCount = getChannelCount(mCommon.input.base.channelMask);
     const auto outputChannelCount = getChannelCount(mCommon.output.base.channelMask);
     if (inputChannelCount < outputChannelCount) {
         LOG(ERROR) << __func__ << " invalid channel count, in: " << inputChannelCount
                    << " out: " << outputChannelCount;
-        return status;
+        return procStatus;
     }
 
-    int iFrames = samples / inputChannelCount;
+    if (samples <= 0 || 0 != samples % inputChannelCount) {
+        LOG(ERROR) << __func__ << " invalid samples: " << samples;
+        return procStatus;
+    }
+
+    const int iFrames = samples / inputChannelCount;
+    const float gainPerSample = 1.f / iFrames;
     for (int i = 0; i < iFrames; i++) {
-        std::memcpy(out, in, outputChannelCount);
+        if (isDraining()) {
+            const float gain = (iFrames - i - 1) * gainPerSample;
+            for (size_t c = 0; c < outputChannelCount; c++) {
+                out[c] = in[c] * gain;
+            }
+        } else {
+            std::memcpy(out, in, outputChannelCount * sizeof(float));
+        }
+
         in += inputChannelCount;
         out += outputChannelCount;
     }
-    return {STATUS_OK, static_cast<int32_t>(iFrames * inputChannelCount),
-            static_cast<int32_t>(iFrames * outputChannelCount)};
+
+    // drain for one cycle
+    if (isDraining()) {
+        procStatus.status = STATUS_NOT_ENOUGH_DATA;
+        finishDraining();
+    } else {
+        procStatus.status = STATUS_OK;
+    }
+    procStatus.fmqConsumed = static_cast<int32_t>(iFrames * inputChannelCount);
+    procStatus.fmqProduced = static_cast<int32_t>(iFrames * outputChannelCount);
+
+    return procStatus;
 }
 
 }  // namespace aidl::android::hardware::audio::effect
diff --git a/audio/aidl/default/eraser/Eraser.h b/audio/aidl/default/eraser/Eraser.h
index 0d4eb8f..7bf2f57 100644
--- a/audio/aidl/default/eraser/Eraser.h
+++ b/audio/aidl/default/eraser/Eraser.h
@@ -63,6 +63,9 @@
     IEffect::Status effectProcessImpl(float* in, float* out, int samples)
             REQUIRES(mImplMutex) final;
 
+    ndk::ScopedAStatus command(CommandId command) final;
+    void drainingComplete_l() REQUIRES(mImplMutex);
+
   private:
     static const std::vector<Range::SpatializerRange> kRanges;
     std::shared_ptr<EraserSwContext> mContext GUARDED_BY(mImplMutex);
diff --git a/audio/aidl/default/include/effect-impl/EffectContext.h b/audio/aidl/default/include/effect-impl/EffectContext.h
index 02a4caa..9e44349 100644
--- a/audio/aidl/default/include/effect-impl/EffectContext.h
+++ b/audio/aidl/default/include/effect-impl/EffectContext.h
@@ -86,7 +86,12 @@
     virtual RetCode disable();
     virtual RetCode reset();
 
+    virtual RetCode startDraining();
+    virtual RetCode finishDraining();
+    virtual bool isDraining();
+
   protected:
+    bool mIsDraining = false;
     int mVersion = 0;
     size_t mInputFrameSize = 0;
     size_t mOutputFrameSize = 0;
diff --git a/audio/aidl/default/include/effect-impl/EffectThread.h b/audio/aidl/default/include/effect-impl/EffectThread.h
index ec2a658..9abcdb8 100644
--- a/audio/aidl/default/include/effect-impl/EffectThread.h
+++ b/audio/aidl/default/include/effect-impl/EffectThread.h
@@ -38,6 +38,8 @@
     RetCode destroyThread();
     RetCode startThread();
     RetCode stopThread();
+    RetCode startDraining();
+    RetCode finishDraining();
 
     // Will call process() in a loop if the thread is running.
     void threadLoop();
@@ -49,6 +51,9 @@
      */
     virtual void process() = 0;
 
+  protected:
+    bool mDraining GUARDED_BY(mThreadMutex) = false;
+
   private:
     static constexpr int kMaxTaskNameLen = 15;