diff --git a/media/audioaidlconversion/AidlConversionEffect.cpp b/media/audioaidlconversion/AidlConversionEffect.cpp
new file mode 100644
index 0000000..2f33f00
--- /dev/null
+++ b/media/audioaidlconversion/AidlConversionEffect.cpp
@@ -0,0 +1,326 @@
+/*
+ * 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 <utility>
+
+#define LOG_TAG "AidlConversionEffect"
+//#define LOG_NDEBUG 0
+#include <utils/Log.h>
+
+#include <media/AidlConversionCppNdk.h>
+#include <media/AidlConversionEffect.h>
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// AIDL NDK backend to legacy audio data structure conversion utilities.
+
+namespace aidl {
+namespace android {
+
+using ::aidl::android::hardware::audio::effect::AcousticEchoCanceler;
+using ::aidl::android::hardware::audio::effect::AutomaticGainControl;
+using ::aidl::android::hardware::audio::effect::BassBoost;
+using ::aidl::android::hardware::audio::effect::Descriptor;
+using ::aidl::android::hardware::audio::effect::Downmix;
+using ::aidl::android::hardware::audio::effect::Flags;
+using ::aidl::android::hardware::audio::effect::Parameter;
+using ::aidl::android::media::audio::common::AudioDeviceDescription;
+
+using ::android::BAD_VALUE;
+using ::android::base::unexpected;
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// Converters
+
+ConversionResult<uint32_t> aidl2legacy_Flags_Type_uint32(Flags::Type type) {
+    switch (type) {
+        case Flags::Type::INSERT:
+            return EFFECT_FLAG_TYPE_INSERT;
+        case Flags::Type::AUXILIARY:
+            return EFFECT_FLAG_TYPE_AUXILIARY;
+        case Flags::Type::REPLACE:
+            return EFFECT_FLAG_TYPE_REPLACE;
+        case Flags::Type::PRE_PROC:
+            return EFFECT_FLAG_TYPE_PRE_PROC;
+        case Flags::Type::POST_PROC:
+            return EFFECT_FLAG_TYPE_POST_PROC;
+    }
+    return unexpected(BAD_VALUE);
+}
+
+ConversionResult<Flags::Type> legacy2aidl_uint32_Flags_Type(uint32_t legacy) {
+    switch (legacy & EFFECT_FLAG_TYPE_MASK) {
+        case EFFECT_FLAG_TYPE_INSERT:
+            return Flags::Type::INSERT;
+        case EFFECT_FLAG_TYPE_AUXILIARY:
+            return Flags::Type::AUXILIARY;
+        case EFFECT_FLAG_TYPE_REPLACE:
+            return Flags::Type::REPLACE;
+        case EFFECT_FLAG_TYPE_PRE_PROC:
+            return Flags::Type::PRE_PROC;
+        case EFFECT_FLAG_TYPE_POST_PROC:
+            return Flags::Type::POST_PROC;
+    }
+    return unexpected(BAD_VALUE);
+}
+
+ConversionResult<uint32_t> aidl2legacy_Flags_Insert_uint32(Flags::Insert insert) {
+    switch (insert) {
+        case Flags::Insert::ANY:
+            return EFFECT_FLAG_INSERT_ANY;
+        case Flags::Insert::FIRST:
+            return EFFECT_FLAG_INSERT_FIRST;
+        case Flags::Insert::LAST:
+            return EFFECT_FLAG_INSERT_LAST;
+        case Flags::Insert::EXCLUSIVE:
+            return EFFECT_FLAG_INSERT_EXCLUSIVE;
+    }
+    return unexpected(BAD_VALUE);
+}
+
+ConversionResult<Flags::Insert> legacy2aidl_uint32_Flags_Insert(uint32_t legacy) {
+    switch (legacy & EFFECT_FLAG_INSERT_MASK) {
+        case EFFECT_FLAG_INSERT_ANY:
+            return Flags::Insert::ANY;
+        case EFFECT_FLAG_INSERT_FIRST:
+            return Flags::Insert::FIRST;
+        case EFFECT_FLAG_INSERT_LAST:
+            return Flags::Insert::LAST;
+        case EFFECT_FLAG_INSERT_EXCLUSIVE:
+            return Flags::Insert::EXCLUSIVE;
+    }
+    return unexpected(BAD_VALUE);
+}
+
+ConversionResult<uint32_t> aidl2legacy_Flags_Volume_uint32(Flags::Volume volume) {
+    switch (volume) {
+        case Flags::Volume::NONE:
+            return 0;
+        case Flags::Volume::CTRL:
+            return EFFECT_FLAG_VOLUME_CTRL;
+        case Flags::Volume::IND:
+            return EFFECT_FLAG_VOLUME_IND;
+        case Flags::Volume::MONITOR:
+            return EFFECT_FLAG_VOLUME_MONITOR;
+    }
+    return unexpected(BAD_VALUE);
+}
+
+ConversionResult<Flags::Volume> legacy2aidl_uint32_Flags_Volume(uint32_t legacy) {
+    switch (legacy & EFFECT_FLAG_VOLUME_MASK) {
+        case EFFECT_FLAG_VOLUME_CTRL:
+            return Flags::Volume::CTRL;
+        case EFFECT_FLAG_VOLUME_IND:
+            return Flags::Volume::IND;
+        case EFFECT_FLAG_VOLUME_MONITOR:
+            return Flags::Volume::MONITOR;
+        case EFFECT_FLAG_VOLUME_NONE:
+            return Flags::Volume::NONE;
+    }
+    return unexpected(BAD_VALUE);
+}
+
+ConversionResult<uint32_t> aidl2legacy_Flags_uint32(Flags aidl) {
+    uint32_t legacy = 0;
+    legacy |= VALUE_OR_RETURN(aidl2legacy_Flags_Type_uint32(aidl.type));
+    legacy |= VALUE_OR_RETURN(aidl2legacy_Flags_Insert_uint32(aidl.insert));
+    legacy |= VALUE_OR_RETURN(aidl2legacy_Flags_Volume_uint32(aidl.volume));
+    legacy |= VALUE_OR_RETURN(aidl2legacy_Flags_HardwareAccelerator_uint32(aidl.hwAcceleratorMode));
+
+    if (aidl.offloadIndication) {
+        legacy |= EFFECT_FLAG_OFFLOAD_SUPPORTED;
+    }
+    if (aidl.deviceIndication) {
+        legacy |= EFFECT_FLAG_DEVICE_IND;
+    }
+    if (aidl.audioModeIndication) {
+        legacy |= EFFECT_FLAG_AUDIO_MODE_IND;
+    }
+    if (aidl.audioSourceIndication) {
+        legacy |= EFFECT_FLAG_AUDIO_SOURCE_IND;
+    }
+    if (aidl.noProcessing) {
+        legacy |= EFFECT_FLAG_NO_PROCESS;
+    }
+    return legacy;
+}
+
+ConversionResult<Flags> legacy2aidl_uint32_Flags(uint32_t legacy) {
+    Flags aidl;
+
+    aidl.type = VALUE_OR_RETURN(legacy2aidl_uint32_Flags_Type(legacy));
+    aidl.insert = VALUE_OR_RETURN(legacy2aidl_uint32_Flags_Insert(legacy));
+    aidl.volume = VALUE_OR_RETURN(legacy2aidl_uint32_Flags_Volume(legacy));
+    aidl.hwAcceleratorMode = VALUE_OR_RETURN(legacy2aidl_uint32_Flags_HardwareAccelerator(legacy));
+    aidl.offloadIndication = (legacy & EFFECT_FLAG_OFFLOAD_SUPPORTED);
+    aidl.deviceIndication = (legacy & EFFECT_FLAG_DEVICE_IND);
+    aidl.audioModeIndication = (legacy & EFFECT_FLAG_AUDIO_MODE_IND);
+    aidl.audioSourceIndication = (legacy & EFFECT_FLAG_AUDIO_SOURCE_IND);
+    aidl.noProcessing = (legacy & EFFECT_FLAG_NO_PROCESS);
+    return aidl;
+}
+
+ConversionResult<uint32_t> aidl2legacy_Flags_HardwareAccelerator_uint32(
+        Flags::HardwareAccelerator hwAcceleratorMode) {
+    switch (hwAcceleratorMode) {
+        case Flags::HardwareAccelerator::NONE:
+            return 0;
+        case Flags::HardwareAccelerator::SIMPLE:
+            return EFFECT_FLAG_HW_ACC_SIMPLE;
+        case Flags::HardwareAccelerator::TUNNEL:
+            return EFFECT_FLAG_HW_ACC_TUNNEL;
+    }
+    return unexpected(BAD_VALUE);
+}
+
+ConversionResult<Flags::HardwareAccelerator> legacy2aidl_uint32_Flags_HardwareAccelerator(
+        uint32_t legacy) {
+    switch (legacy & EFFECT_FLAG_HW_ACC_MASK) {
+        case EFFECT_FLAG_HW_ACC_SIMPLE:
+            return Flags::HardwareAccelerator::SIMPLE;
+        case EFFECT_FLAG_HW_ACC_TUNNEL:
+            return Flags::HardwareAccelerator::TUNNEL;
+        case 0:
+            return Flags::HardwareAccelerator::NONE;
+    }
+    return unexpected(BAD_VALUE);
+}
+
+ConversionResult<effect_descriptor_t>
+aidl2legacy_Descriptor_effect_descriptor(const Descriptor& aidl) {
+    effect_descriptor_t legacy;
+    legacy.type = VALUE_OR_RETURN(aidl2legacy_AudioUuid_audio_uuid_t(aidl.common.id.type));
+    legacy.uuid = VALUE_OR_RETURN(aidl2legacy_AudioUuid_audio_uuid_t(aidl.common.id.uuid));
+    // legacy descriptor doesn't have proxy information
+    // proxy = VALUE_OR_RETURN(aidl2legacy_AudioUuid_audio_uuid_t(aidl.proxy));
+    legacy.apiVersion = EFFECT_CONTROL_API_VERSION;
+    legacy.flags = VALUE_OR_RETURN(aidl2legacy_Flags_uint32(aidl.common.flags));
+    legacy.cpuLoad = VALUE_OR_RETURN(convertIntegral<uint16_t>(aidl.common.cpuLoad));
+    legacy.memoryUsage = VALUE_OR_RETURN(convertIntegral<uint16_t>(aidl.common.memoryUsage));
+    RETURN_IF_ERROR(aidl2legacy_string(aidl.common.name, legacy.name, sizeof(legacy.name)));
+    RETURN_IF_ERROR(aidl2legacy_string(aidl.common.implementor, legacy.implementor,
+                                        sizeof(legacy.implementor)));
+    return legacy;
+}
+
+ConversionResult<Descriptor>
+legacy2aidl_effect_descriptor_Descriptor(const effect_descriptor_t& legacy) {
+    Descriptor aidl;
+    aidl.common.id.type = VALUE_OR_RETURN(legacy2aidl_audio_uuid_t_AudioUuid(legacy.type));
+    aidl.common.id.uuid = VALUE_OR_RETURN(legacy2aidl_audio_uuid_t_AudioUuid(legacy.uuid));
+    // legacy descriptor doesn't have proxy information
+    // aidl.common.id.proxy
+    aidl.common.flags = VALUE_OR_RETURN(legacy2aidl_uint32_Flags(legacy.flags));
+    aidl.common.cpuLoad = VALUE_OR_RETURN(convertIntegral<int32_t>(legacy.cpuLoad));
+    aidl.common.memoryUsage = VALUE_OR_RETURN(convertIntegral<int32_t>(legacy.memoryUsage));
+    aidl.common.name = VALUE_OR_RETURN(legacy2aidl_string(legacy.name, sizeof(legacy.name)));
+    aidl.common.implementor =
+            VALUE_OR_RETURN(legacy2aidl_string(legacy.implementor, sizeof(legacy.implementor)));
+    return aidl;
+}
+
+ConversionResult<uint32_t> aidl2legacy_Parameter_aec_uint32_echoDelay(const Parameter& aidl) {
+    int echoDelay = VALUE_OR_RETURN(GET_PARAMETER_SPECIFIC_FIELD(
+            aidl, AcousticEchoCanceler, acousticEchoCanceler, echoDelayUs, int));
+    return VALUE_OR_RETURN(convertReinterpret<uint32_t>(echoDelay));
+}
+
+ConversionResult<Parameter> legacy2aidl_uint32_echoDelay_Parameter_aec(uint32_t legacy) {
+    int delay = VALUE_OR_RETURN(convertReinterpret<int32_t>(legacy));
+    return MAKE_SPECIFIC_PARAMETER(AcousticEchoCanceler, acousticEchoCanceler, echoDelayUs, delay);
+}
+
+ConversionResult<uint32_t> aidl2legacy_Parameter_aec_uint32_mobileMode(const Parameter& aidl) {
+    bool mobileMode = VALUE_OR_RETURN(GET_PARAMETER_SPECIFIC_FIELD(
+            aidl, AcousticEchoCanceler, acousticEchoCanceler, mobileMode, bool));
+    return VALUE_OR_RETURN(convertIntegral<uint32_t>(mobileMode));
+}
+
+ConversionResult<Parameter> legacy2aidl_uint32_mobileMode_Parameter_aec(uint32_t legacy) {
+    bool mode = VALUE_OR_RETURN(convertIntegral<bool>(legacy));
+    return MAKE_SPECIFIC_PARAMETER(AcousticEchoCanceler, acousticEchoCanceler, mobileMode, mode);
+}
+
+ConversionResult<uint32_t> aidl2legacy_Parameter_agc_uint32_fixedDigitalGain(
+        const Parameter& aidl) {
+    int gain = VALUE_OR_RETURN(GET_PARAMETER_SPECIFIC_FIELD(
+            aidl, AutomaticGainControl, automaticGainControl, fixedDigitalGainMb, int));
+    return VALUE_OR_RETURN(convertReinterpret<uint32_t>(gain));
+}
+
+ConversionResult<Parameter> legacy2aidl_uint32_fixedDigitalGain_Parameter_agc(uint32_t legacy) {
+    int gain = VALUE_OR_RETURN(convertReinterpret<int>(legacy));
+    return MAKE_SPECIFIC_PARAMETER(AutomaticGainControl, automaticGainControl, fixedDigitalGainMb,
+                                   gain);
+}
+
+ConversionResult<uint32_t> aidl2legacy_Parameter_agc_uint32_levelEstimator(
+        const Parameter& aidl) {
+    const auto& le = VALUE_OR_RETURN(
+            GET_PARAMETER_SPECIFIC_FIELD(aidl, AutomaticGainControl, automaticGainControl,
+                                         levelEstimator, AutomaticGainControl::LevelEstimator));
+    return static_cast<uint32_t>(le);
+}
+
+ConversionResult<Parameter> legacy2aidl_uint32_levelEstimator_Parameter_agc(uint32_t legacy) {
+    if (legacy > (uint32_t) AutomaticGainControl::LevelEstimator::PEAK) {
+        return unexpected(BAD_VALUE);
+    }
+    AutomaticGainControl::LevelEstimator le =
+            static_cast<AutomaticGainControl::LevelEstimator>(legacy);
+    return MAKE_SPECIFIC_PARAMETER(AutomaticGainControl, automaticGainControl, levelEstimator, le);
+}
+
+ConversionResult<uint32_t> aidl2legacy_Parameter_agc_uint32_saturationMargin(
+        const Parameter& aidl) {
+    int saturationMargin = VALUE_OR_RETURN(GET_PARAMETER_SPECIFIC_FIELD(
+            aidl, AutomaticGainControl, automaticGainControl, saturationMarginMb, int));
+    return VALUE_OR_RETURN(convertIntegral<uint32_t>(saturationMargin));
+}
+
+ConversionResult<Parameter> legacy2aidl_uint32_saturationMargin_Parameter_agc(uint32_t legacy) {
+    int saturationMargin = VALUE_OR_RETURN(convertIntegral<int>(legacy));
+    return MAKE_SPECIFIC_PARAMETER(AutomaticGainControl, automaticGainControl, saturationMarginMb,
+                                   saturationMargin);
+}
+
+ConversionResult<uint16_t> aidl2legacy_Parameter_BassBoost_uint16_strengthPm(
+        const Parameter& aidl) {
+    int strength = VALUE_OR_RETURN(
+            GET_PARAMETER_SPECIFIC_FIELD(aidl, BassBoost, bassBoost, strengthPm, int));
+    return VALUE_OR_RETURN(convertIntegral<uint16_t>(strength));
+}
+
+ConversionResult<Parameter> legacy2aidl_uint16_strengthPm_Parameter_BassBoost(uint16_t legacy) {
+    int strength = VALUE_OR_RETURN(convertIntegral<int>(legacy));
+    return MAKE_SPECIFIC_PARAMETER(BassBoost, bassBoost, strengthPm, strength);
+}
+
+ConversionResult<int16_t> aidl2legacy_Parameter_Downmix_int16_type(const Parameter& aidl) {
+    Downmix::Type aidlType = VALUE_OR_RETURN(
+            GET_PARAMETER_SPECIFIC_FIELD(aidl, Downmix, downmix, type, Downmix::Type));
+    return VALUE_OR_RETURN(convertIntegral<int16_t>(static_cast<uint32_t>(aidlType)));
+}
+
+ConversionResult<Parameter> legacy2aidl_int16_type_Parameter_Downmix(int16_t legacy) {
+    if (legacy > (uint32_t) Downmix::Type::FOLD) {
+        return unexpected(BAD_VALUE);
+    }
+    Downmix::Type aidlType = static_cast<Downmix::Type>(legacy);
+    return MAKE_SPECIFIC_PARAMETER(Downmix, downmix, type, aidlType);
+}
+
+}  // namespace android
+}  // aidl