diff --git a/audio/aidl/default/Stream.cpp b/audio/aidl/default/Stream.cpp
index 424c3e4..e984091 100644
--- a/audio/aidl/default/Stream.cpp
+++ b/audio/aidl/default/Stream.cpp
@@ -658,6 +658,17 @@
     return ndk::ScopedAStatus::fromExceptionCode(EX_UNSUPPORTED_OPERATION);
 }
 
+ndk::ScopedAStatus StreamIn::getHwGain(std::vector<float>* _aidl_return) {
+    LOG(DEBUG) << __func__;
+    (void)_aidl_return;
+    return ndk::ScopedAStatus::fromExceptionCode(EX_UNSUPPORTED_OPERATION);
+}
+
+ndk::ScopedAStatus StreamIn::setHwGain(const std::vector<float>& in_channelGains) {
+    LOG(DEBUG) << __func__ << ": gains " << ::android::internal::ToString(in_channelGains);
+    return ndk::ScopedAStatus::fromExceptionCode(EX_UNSUPPORTED_OPERATION);
+}
+
 // static
 ndk::ScopedAStatus StreamOut::createInstance(const SourceMetadata& sourceMetadata,
                                              StreamContext context,
@@ -680,4 +691,15 @@
     LOG(DEBUG) << __func__;
 }
 
+ndk::ScopedAStatus StreamOut::getHwVolume(std::vector<float>* _aidl_return) {
+    LOG(DEBUG) << __func__;
+    (void)_aidl_return;
+    return ndk::ScopedAStatus::fromExceptionCode(EX_UNSUPPORTED_OPERATION);
+}
+
+ndk::ScopedAStatus StreamOut::setHwVolume(const std::vector<float>& in_channelVolumes) {
+    LOG(DEBUG) << __func__ << ": gains " << ::android::internal::ToString(in_channelVolumes);
+    return ndk::ScopedAStatus::fromExceptionCode(EX_UNSUPPORTED_OPERATION);
+}
+
 }  // namespace aidl::android::hardware::audio::core
diff --git a/audio/aidl/default/include/core-impl/Stream.h b/audio/aidl/default/include/core-impl/Stream.h
index 5746f9d..e8b2c54 100644
--- a/audio/aidl/default/include/core-impl/Stream.h
+++ b/audio/aidl/default/include/core-impl/Stream.h
@@ -305,6 +305,8 @@
         return StreamCommonImpl<::aidl::android::hardware::audio::common::SinkMetadata,
                                 StreamInWorker>::updateMetadata(in_sinkMetadata);
     }
+    ndk::ScopedAStatus getHwGain(std::vector<float>* _aidl_return) override;
+    ndk::ScopedAStatus setHwGain(const std::vector<float>& in_channelGains) override;
 
   public:
     static ndk::ScopedAStatus createInstance(
@@ -337,6 +339,8 @@
         return StreamCommonImpl<::aidl::android::hardware::audio::common::SourceMetadata,
                                 StreamOutWorker>::updateMetadata(in_sourceMetadata);
     }
+    ndk::ScopedAStatus getHwVolume(std::vector<float>* _aidl_return) override;
+    ndk::ScopedAStatus setHwVolume(const std::vector<float>& in_channelVolumes) override;
 
   public:
     static ndk::ScopedAStatus createInstance(