diff --git a/audio/aidl/Android.bp b/audio/aidl/Android.bp
index 01af940..e2ba400 100644
--- a/audio/aidl/Android.bp
+++ b/audio/aidl/Android.bp
@@ -230,6 +230,7 @@
         "android/hardware/audio/effect/BassBoost.aidl",
         "android/hardware/audio/effect/Capability.aidl",
         "android/hardware/audio/effect/CommandId.aidl",
+        "android/hardware/audio/effect/DefaultExtension.aidl",
         "android/hardware/audio/effect/Descriptor.aidl",
         "android/hardware/audio/effect/Downmix.aidl",
         "android/hardware/audio/effect/DynamicsProcessing.aidl",
diff --git a/audio/aidl/aidl_api/android.hardware.audio.effect/current/android/hardware/audio/effect/DefaultExtension.aidl b/audio/aidl/aidl_api/android.hardware.audio.effect/current/android/hardware/audio/effect/DefaultExtension.aidl
new file mode 100644
index 0000000..f1cf389
--- /dev/null
+++ b/audio/aidl/aidl_api/android.hardware.audio.effect/current/android/hardware/audio/effect/DefaultExtension.aidl
@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+///////////////////////////////////////////////////////////////////////////////
+// THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
+///////////////////////////////////////////////////////////////////////////////
+
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
+//
+// You must not make a backward incompatible change to any AIDL file built
+// with the aidl_interface module type with versions property set. The module
+// type is used to build AIDL files in a way that they can be used across
+// independently updatable components of the system. If a device is shipped
+// with such a backward incompatible change, it has a high risk of breaking
+// later when a module using the interface is updated, e.g., Mainline modules.
+
+package android.hardware.audio.effect;
+@VintfStability
+parcelable DefaultExtension {
+  byte[] bytes;
+}
diff --git a/audio/aidl/android/hardware/audio/effect/DefaultExtension.aidl b/audio/aidl/android/hardware/audio/effect/DefaultExtension.aidl
new file mode 100644
index 0000000..33e827f
--- /dev/null
+++ b/audio/aidl/android/hardware/audio/effect/DefaultExtension.aidl
@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.hardware.audio.effect;
+
+/**
+ * The default extension used for Parameter.Specific.vendorEffect ParcelableHolder.
+ *
+ * The audio framework attach this default extension to the ParcelableHolder in VendorExtension,
+ * and pass though all parameters it received from the client to audio HAL.
+ *
+ * For now it's not possible for vendor to define their own vendor extensions without changing the
+ * audio framework. More specificly, in order to add a customized effect parameter AIDL parcelable,
+ * vendors need to add the logic for conversion between AIDL and effect_param_t for the effect AIDL
+ * in: frameworks/av/media/libaudiohal/impl/effectAidlConversion.
+ *
+ * There is no VTS test cases for the vendor extension effect implementation, however all effect
+ * implementations must support the common parameters defined in Parameter.aidl, so vendor
+ * extension effect implementation still need to support setting and getting of these common
+ * parameters, which is enforced by VTS.
+ */
+@VintfStability
+parcelable DefaultExtension {
+    byte[] bytes;
+}
diff --git a/audio/aidl/default/EffectImpl.cpp b/audio/aidl/default/EffectImpl.cpp
index fa9eb95..e90fe35 100644
--- a/audio/aidl/default/EffectImpl.cpp
+++ b/audio/aidl/default/EffectImpl.cpp
@@ -107,11 +107,8 @@
                                      "CommonParamNotSupported");
             break;
         }
-        case Parameter::Id::vendorEffectTag: {
-            LOG(DEBUG) << __func__ << " noop for vendor tag";
-            return ndk::ScopedAStatus::fromExceptionCodeWithMessage(EX_ILLEGAL_ARGUMENT,
-                                                                    "vendortagNotSupported");
-        }
+        case Parameter::Id::vendorEffectTag:
+            FALLTHROUGH_INTENDED;
         default: {
             Parameter::Specific specific;
             RETURN_IF_ASTATUS_NOT_OK(getParameterSpecific(id, &specific), "SpecParamNotSupported");
diff --git a/audio/aidl/default/audio_effects_config.xml b/audio/aidl/default/audio_effects_config.xml
index 6714a7e..248d28f 100644
--- a/audio/aidl/default/audio_effects_config.xml
+++ b/audio/aidl/default/audio_effects_config.xml
@@ -44,6 +44,7 @@
         <library name="virtualizersw" path="libvirtualizersw.so"/>
         <library name="visualizer" path="libvisualizeraidl.so"/>
         <library name="volumesw" path="libvolumesw.so"/>
+        <library name="extensioneffect" path="libextensioneffect.so"/>
     </libraries>
 
     <!-- list of effects to load.
@@ -93,6 +94,7 @@
             <libsw library="equalizersw" uuid="0bed4300-847d-11df-bb17-0002a5d5c51b"/>
             <libsw library="bundle" uuid="ce772f20-847d-11df-bb17-0002a5d5c51b"/>
         </effectProxy>
+        <effect name="extensioneffect" library="extensioneffect" uuid="fa81dd00-588b-11ed-9b6a-0242ac120002"/>
     </effects>
 
     <!-- Audio pre processor configurations.
diff --git a/audio/aidl/default/extension/Android.bp b/audio/aidl/default/extension/Android.bp
new file mode 100644
index 0000000..4e5d352
--- /dev/null
+++ b/audio/aidl/default/extension/Android.bp
@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package {
+    // See: http://go/android-license-faq
+    // A large-scale-change added 'default_applicable_licenses' to import
+    // all of the 'license_kinds' from "hardware_interfaces_license"
+    // to get the below license kinds:
+    //   SPDX-license-identifier-Apache-2.0
+    default_applicable_licenses: ["hardware_interfaces_license"],
+}
+
+cc_library_shared {
+    name: "libextensioneffect",
+    defaults: [
+        "aidlaudioeffectservice_defaults",
+        "latest_android_media_audio_common_types_ndk_shared",
+        "latest_android_hardware_audio_effect_ndk_shared",
+    ],
+    srcs: [
+        "ExtensionEffect.cpp",
+        ":effectCommonFile",
+    ],
+    relative_install_path: "soundfx",
+    visibility: [
+        "//hardware/interfaces/audio/aidl/default",
+    ],
+}
diff --git a/audio/aidl/default/extension/ExtensionEffect.cpp b/audio/aidl/default/extension/ExtensionEffect.cpp
new file mode 100644
index 0000000..d2e3ccd
--- /dev/null
+++ b/audio/aidl/default/extension/ExtensionEffect.cpp
@@ -0,0 +1,142 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <algorithm>
+#include <cstddef>
+#include <memory>
+#include <unordered_set>
+
+#define LOG_TAG "AHAL_ExtensionEffect"
+#include <Utils.h>
+#include <aidl/android/hardware/audio/effect/DefaultExtension.h>
+#include <android-base/logging.h>
+#include <fmq/AidlMessageQueue.h>
+
+#include "ExtensionEffect.h"
+
+using aidl::android::hardware::audio::effect::DefaultExtension;
+using aidl::android::hardware::audio::effect::Descriptor;
+using aidl::android::hardware::audio::effect::ExtensionEffect;
+using aidl::android::hardware::audio::effect::IEffect;
+using aidl::android::hardware::audio::effect::kExtensionEffectImplUUID;
+using aidl::android::hardware::audio::effect::kExtensionEffectTypeUUID;
+using aidl::android::hardware::audio::effect::Range;
+using aidl::android::hardware::audio::effect::VendorExtension;
+using aidl::android::media::audio::common::AudioUuid;
+
+extern "C" binder_exception_t createEffect(const AudioUuid* in_impl_uuid,
+                                           std::shared_ptr<IEffect>* instanceSpp) {
+    if (!in_impl_uuid || *in_impl_uuid != kExtensionEffectImplUUID) {
+        LOG(ERROR) << __func__ << "uuid not supported";
+        return EX_ILLEGAL_ARGUMENT;
+    }
+    if (instanceSpp) {
+        *instanceSpp = ndk::SharedRefBase::make<ExtensionEffect>();
+        LOG(DEBUG) << __func__ << " instance " << instanceSpp->get() << " created";
+        return EX_NONE;
+    } else {
+        LOG(ERROR) << __func__ << " invalid input parameter!";
+        return EX_ILLEGAL_ARGUMENT;
+    }
+}
+
+extern "C" binder_exception_t queryEffect(const AudioUuid* in_impl_uuid, Descriptor* _aidl_return) {
+    if (!in_impl_uuid || *in_impl_uuid != kExtensionEffectImplUUID) {
+        LOG(ERROR) << __func__ << "uuid not supported";
+        return EX_ILLEGAL_ARGUMENT;
+    }
+    *_aidl_return = ExtensionEffect::kDescriptor;
+    return EX_NONE;
+}
+
+namespace aidl::android::hardware::audio::effect {
+
+const std::string ExtensionEffect::kEffectName = "ExtensionEffectExample";
+
+const Descriptor ExtensionEffect::kDescriptor = {
+        .common = {.id = {.type = kExtensionEffectTypeUUID,
+                          .uuid = kExtensionEffectImplUUID,
+                          .proxy = std::nullopt},
+                   .name = ExtensionEffect::kEffectName,
+                   .implementor = "The Android Open Source Project"}};
+
+ndk::ScopedAStatus ExtensionEffect::getDescriptor(Descriptor* _aidl_return) {
+    LOG(DEBUG) << __func__ << kDescriptor.toString();
+    *_aidl_return = kDescriptor;
+    return ndk::ScopedAStatus::ok();
+}
+
+ndk::ScopedAStatus ExtensionEffect::setParameterSpecific(const Parameter::Specific& specific) {
+    RETURN_IF(Parameter::Specific::vendorEffect != specific.getTag(), EX_ILLEGAL_ARGUMENT,
+              "EffectNotSupported");
+    RETURN_IF(!mContext, EX_NULL_POINTER, "nullContext");
+
+    auto& vendorEffect = specific.get<Parameter::Specific::vendorEffect>();
+    std::optional<DefaultExtension> defaultExt;
+    RETURN_IF(STATUS_OK != vendorEffect.extension.getParcelable(&defaultExt), EX_ILLEGAL_ARGUMENT,
+              "getParcelableFailed");
+    RETURN_IF(!defaultExt.has_value(), EX_ILLEGAL_ARGUMENT, "parcelableNulld");
+    RETURN_IF(mContext->setParams(defaultExt->bytes) != RetCode::SUCCESS, EX_ILLEGAL_ARGUMENT,
+              "paramNotSupported");
+
+    return ndk::ScopedAStatus::ok();
+}
+
+ndk::ScopedAStatus ExtensionEffect::getParameterSpecific(const Parameter::Id& id,
+                                                         Parameter::Specific* specific) {
+    auto tag = id.getTag();
+    RETURN_IF(Parameter::Id::vendorEffectTag != tag, EX_ILLEGAL_ARGUMENT, "wrongIdTag");
+    auto specificId = id.get<Parameter::Id::vendorEffectTag>();
+    VendorExtension extension;
+    DefaultExtension defaultExt;
+    defaultExt.bytes = mContext->getParams(specificId);
+    RETURN_IF(STATUS_OK != extension.extension.setParcelable(defaultExt), EX_ILLEGAL_ARGUMENT,
+              "setParcelableFailed");
+    specific->set<Parameter::Specific::vendorEffect>(extension);
+    return ndk::ScopedAStatus::ok();
+}
+
+std::shared_ptr<EffectContext> ExtensionEffect::createContext(const Parameter::Common& common) {
+    if (mContext) {
+        LOG(DEBUG) << __func__ << " context already exist";
+    } else {
+        mContext = std::make_shared<ExtensionEffectContext>(1 /* statusFmqDepth */, common);
+    }
+    return mContext;
+}
+
+std::shared_ptr<EffectContext> ExtensionEffect::getContext() {
+    return mContext;
+}
+
+RetCode ExtensionEffect::releaseContext() {
+    if (mContext) {
+        mContext.reset();
+    }
+    return RetCode::SUCCESS;
+}
+
+// Processing method running in EffectWorker thread.
+IEffect::Status ExtensionEffect::effectProcessImpl(float* in, float* out, int samples) {
+    // TODO: get data buffer and process.
+    LOG(DEBUG) << __func__ << " in " << in << " out " << out << " samples " << samples;
+    for (int i = 0; i < samples; i++) {
+        *out++ = *in++;
+    }
+    return {STATUS_OK, samples, samples};
+}
+
+}  // namespace aidl::android::hardware::audio::effect
diff --git a/audio/aidl/default/extension/ExtensionEffect.h b/audio/aidl/default/extension/ExtensionEffect.h
new file mode 100644
index 0000000..399fa83
--- /dev/null
+++ b/audio/aidl/default/extension/ExtensionEffect.h
@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <aidl/android/hardware/audio/effect/BnEffect.h>
+#include <fmq/AidlMessageQueue.h>
+#include <memory>
+#include <vector>
+
+#include "effect-impl/EffectImpl.h"
+#include "effect-impl/EffectUUID.h"
+
+namespace aidl::android::hardware::audio::effect {
+
+class ExtensionEffectContext final : public EffectContext {
+  public:
+    ExtensionEffectContext(int statusDepth, const Parameter::Common& common)
+        : EffectContext(statusDepth, common) {
+        LOG(DEBUG) << __func__;
+    }
+
+    RetCode setParams(const std::vector<uint8_t>& params) {
+        mParams = params;
+        return RetCode::SUCCESS;
+    }
+    std::vector<uint8_t> getParams(int tag __unused) const { return mParams; }
+
+  private:
+    std::vector<uint8_t> mParams;
+};
+
+class ExtensionEffect final : public EffectImpl {
+  public:
+    static const std::string kEffectName;
+    static const Capability kCapability;
+    static const Descriptor kDescriptor;
+    ExtensionEffect() { LOG(DEBUG) << __func__; }
+    ~ExtensionEffect() {
+        cleanUp();
+        LOG(DEBUG) << __func__;
+    }
+
+    ndk::ScopedAStatus getDescriptor(Descriptor* _aidl_return) override;
+    ndk::ScopedAStatus setParameterSpecific(const Parameter::Specific& specific) override;
+    ndk::ScopedAStatus getParameterSpecific(const Parameter::Id& id,
+                                            Parameter::Specific* specific) override;
+
+    std::shared_ptr<EffectContext> createContext(const Parameter::Common& common) override;
+    std::shared_ptr<EffectContext> getContext() override;
+    RetCode releaseContext() override;
+
+    std::string getEffectName() override { return kEffectName; };
+    IEffect::Status effectProcessImpl(float* in, float* out, int samples) override;
+
+  private:
+    std::shared_ptr<ExtensionEffectContext> mContext;
+};
+}  // namespace aidl::android::hardware::audio::effect
diff --git a/audio/aidl/default/include/effect-impl/EffectUUID.h b/audio/aidl/default/include/effect-impl/EffectUUID.h
index 7703091..12b4692 100644
--- a/audio/aidl/default/include/effect-impl/EffectUUID.h
+++ b/audio/aidl/default/include/effect-impl/EffectUUID.h
@@ -81,12 +81,12 @@
                                               0x4d24,
                                               0xaa88,
                                               {0x00, 0x02, 0xa5, 0xd5, 0xc5, 0x1b}};
-// fa81862a-588b-11ed-9b6a-0242ac120002
-static const AudioUuid kDownmixTypeUUID = {static_cast<int32_t>(0xfa81862a),
-                                           0x588b,
-                                           0x11ed,
-                                           0x9b6a,
-                                           {0x02, 0x42, 0xac, 0x12, 0x00, 0x02}};
+// 381e49cc-a858-4aa2-87f6-e8388e7601b2
+static const AudioUuid kDownmixTypeUUID = {static_cast<int32_t>(0x381e49cc),
+                                           0xa858,
+                                           0x4aa2,
+                                           0x87f6,
+                                           {0xe8, 0x38, 0x8e, 0x76, 0x01, 0xb2}};
 // fa8187ba-588b-11ed-9b6a-0242ac120002
 static const AudioUuid kDownmixSwImplUUID = {static_cast<int32_t>(0xfa8187ba),
                                              0x588b,
@@ -299,6 +299,18 @@
                                                 0x81f9,
                                                 {0x00, 0x02, 0xa5, 0xd5, 0xc5, 0x1b}};
 
+// fa81dbde-588b-11ed-9b6a-0242ac120002
+static const AudioUuid kExtensionEffectTypeUUID = {static_cast<int32_t>(0xfa81dbde),
+                                                   0x588b,
+                                                   0x11ed,
+                                                   0x9b6a,
+                                                   {0x02, 0x42, 0xac, 0x12, 0x00, 0x02}};
+// fa81dd00-588b-11ed-9b6a-0242ac120002
+static const AudioUuid kExtensionEffectImplUUID = {static_cast<int32_t>(0xfa81dd00),
+                                                   0x588b,
+                                                   0x11ed,
+                                                   0x9b6a,
+                                                   {0x02, 0x42, 0xac, 0x12, 0x00, 0x02}};
 /**
  * @brief A map between effect name and effect type UUID.
  * All <name> attribution in effect/effectProxy of audio_effects.xml should be listed in this map.
@@ -311,6 +323,7 @@
         {"downmix", kDownmixTypeUUID},
         {"dynamics_processing", kDynamicsProcessingTypeUUID},
         {"equalizer", kEqualizerTypeUUID},
+        {"extensioneffect", kExtensionEffectTypeUUID},
         {"haptic_generator", kHapticGeneratorTypeUUID},
         {"loudness_enhancer", kLoudnessEnhancerTypeUUID},
         {"env_reverb", kEnvReverbTypeUUID},