diff --git a/media/audioaidlconversion/AidlConversionCppNdk.cpp b/media/audioaidlconversion/AidlConversionCppNdk.cpp
new file mode 100644
index 0000000..ea1ec0c
--- /dev/null
+++ b/media/audioaidlconversion/AidlConversionCppNdk.cpp
@@ -0,0 +1,2130 @@
+/*
+ * Copyright (C) 2022 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 <map>
+#include <utility>
+#include <vector>
+
+#define LOG_TAG "AidlConversionCppNdk"
+//#define LOG_NDEBUG 0
+#include <utils/Log.h>
+
+#include "media/AidlConversionCppNdk.h"
+
+#include <media/ShmemCompat.h>
+#include <media/stagefright/foundation/MediaDefs.h>
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// Utilities
+
+#if defined(BACKEND_NDK)
+/* AIDL String generated in NDK is different than CPP */
+#define GET_DEVICE_DESC_CONNECTION(x)  AudioDeviceDescription::CONNECTION_##x
+namespace aidl {
+#else
+#define GET_DEVICE_DESC_CONNECTION(x)  AudioDeviceDescription::CONNECTION_##x()
+#endif
+
+namespace android {
+
+using ::android::BAD_VALUE;
+using ::android::OK;
+using ::android::base::unexpected;
+
+using media::audio::common::AudioChannelLayout;
+using media::audio::common::AudioConfig;
+using media::audio::common::AudioConfigBase;
+using media::audio::common::AudioContentType;
+using media::audio::common::AudioDevice;
+using media::audio::common::AudioDeviceAddress;
+using media::audio::common::AudioDeviceDescription;
+using media::audio::common::AudioDeviceType;
+using media::audio::common::AudioEncapsulationMetadataType;
+using media::audio::common::AudioEncapsulationMode;
+using media::audio::common::AudioEncapsulationType;
+using media::audio::common::AudioFormatDescription;
+using media::audio::common::AudioFormatType;
+using media::audio::common::AudioGain;
+using media::audio::common::AudioGainConfig;
+using media::audio::common::AudioGainMode;
+using media::audio::common::AudioInputFlags;
+using media::audio::common::AudioIoFlags;
+using media::audio::common::AudioMode;
+using media::audio::common::AudioOffloadInfo;
+using media::audio::common::AudioOutputFlags;
+using media::audio::common::AudioPortDeviceExt;
+using media::audio::common::AudioPortExt;
+using media::audio::common::AudioPortMixExt;
+using media::audio::common::AudioPortMixExtUseCase;
+using media::audio::common::AudioProfile;
+using media::audio::common::AudioSource;
+using media::audio::common::AudioStandard;
+using media::audio::common::AudioStreamType;
+using media::audio::common::AudioUsage;
+using media::audio::common::AudioUuid;
+using media::audio::common::ExtraAudioDescriptor;
+using media::audio::common::Int;
+using media::audio::common::PcmType;
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// Converters
+
+::android::status_t aidl2legacy_string(std::string_view aidl, char* dest, size_t maxSize) {
+    if (aidl.size() > maxSize - 1) {
+        return BAD_VALUE;
+    }
+    aidl.copy(dest, aidl.size());
+    dest[aidl.size()] = '\0';
+    return OK;
+}
+
+ConversionResult<std::string> legacy2aidl_string(const char* legacy, size_t maxSize) {
+    if (legacy == nullptr) {
+        return unexpected(BAD_VALUE);
+    }
+    if (strnlen(legacy, maxSize) == maxSize) {
+        // No null-terminator.
+        return unexpected(BAD_VALUE);
+    }
+    return std::string(legacy);
+}
+
+ConversionResult<audio_module_handle_t> aidl2legacy_int32_t_audio_module_handle_t(int32_t aidl) {
+    return convertReinterpret<audio_module_handle_t>(aidl);
+}
+
+ConversionResult<int32_t> legacy2aidl_audio_module_handle_t_int32_t(audio_module_handle_t legacy) {
+    return convertReinterpret<int32_t>(legacy);
+}
+
+ConversionResult<audio_io_handle_t> aidl2legacy_int32_t_audio_io_handle_t(int32_t aidl) {
+    return convertReinterpret<audio_io_handle_t>(aidl);
+}
+
+ConversionResult<int32_t> legacy2aidl_audio_io_handle_t_int32_t(audio_io_handle_t legacy) {
+    return convertReinterpret<int32_t>(legacy);
+}
+
+ConversionResult<audio_port_handle_t> aidl2legacy_int32_t_audio_port_handle_t(int32_t aidl) {
+    return convertReinterpret<audio_port_handle_t>(aidl);
+}
+
+ConversionResult<int32_t> legacy2aidl_audio_port_handle_t_int32_t(audio_port_handle_t legacy) {
+    return convertReinterpret<int32_t>(legacy);
+}
+
+ConversionResult<audio_patch_handle_t> aidl2legacy_int32_t_audio_patch_handle_t(int32_t aidl) {
+    return convertReinterpret<audio_patch_handle_t>(aidl);
+}
+
+ConversionResult<int32_t> legacy2aidl_audio_patch_handle_t_int32_t(audio_patch_handle_t legacy) {
+    return convertReinterpret<int32_t>(legacy);
+}
+
+ConversionResult<audio_unique_id_t> aidl2legacy_int32_t_audio_unique_id_t(int32_t aidl) {
+    return convertReinterpret<audio_unique_id_t>(aidl);
+}
+
+ConversionResult<int32_t> legacy2aidl_audio_unique_id_t_int32_t(audio_unique_id_t legacy) {
+    return convertReinterpret<int32_t>(legacy);
+}
+
+ConversionResult<audio_hw_sync_t> aidl2legacy_int32_t_audio_hw_sync_t(int32_t aidl) {
+    return convertReinterpret<audio_hw_sync_t>(aidl);
+}
+
+ConversionResult<int32_t> legacy2aidl_audio_hw_sync_t_int32_t(audio_hw_sync_t legacy) {
+    return convertReinterpret<int32_t>(legacy);
+}
+
+ConversionResult<pid_t> aidl2legacy_int32_t_pid_t(int32_t aidl) {
+    return convertReinterpret<pid_t>(aidl);
+}
+
+ConversionResult<int32_t> legacy2aidl_pid_t_int32_t(pid_t legacy) {
+    return convertReinterpret<int32_t>(legacy);
+}
+
+ConversionResult<uid_t> aidl2legacy_int32_t_uid_t(int32_t aidl) {
+    return convertReinterpret<uid_t>(aidl);
+}
+
+ConversionResult<int32_t> legacy2aidl_uid_t_int32_t(uid_t legacy) {
+    return convertReinterpret<int32_t>(legacy);
+}
+
+ConversionResult<String16> aidl2legacy_string_view_String16(std::string_view aidl) {
+    return String16(aidl.data(), aidl.size());
+}
+
+ConversionResult<std::string> legacy2aidl_String16_string(const String16& legacy) {
+    return std::string(String8(legacy).c_str());
+}
+
+// TODO b/182392769: create an optional -> optional util
+ConversionResult<std::optional<String16>>
+aidl2legacy_optional_string_view_optional_String16(std::optional<std::string_view> aidl) {
+    if (!aidl.has_value()) {
+        return std::nullopt;
+    }
+    ConversionResult<String16> conversion =
+        VALUE_OR_RETURN(aidl2legacy_string_view_String16(aidl.value()));
+    return conversion.value();
+}
+
+ConversionResult<std::optional<std::string_view>>
+legacy2aidl_optional_String16_optional_string(std::optional<String16> legacy) {
+  if (!legacy.has_value()) {
+    return std::nullopt;
+  }
+  ConversionResult<std::string> conversion =
+      VALUE_OR_RETURN(legacy2aidl_String16_string(legacy.value()));
+  return conversion.value();
+}
+
+ConversionResult<String8> aidl2legacy_string_view_String8(std::string_view aidl) {
+    return String8(aidl.data(), aidl.size());
+}
+
+ConversionResult<std::string> legacy2aidl_String8_string(const String8& legacy) {
+    return std::string(legacy.c_str());
+}
+
+namespace {
+
+namespace detail {
+using AudioChannelBitPair = std::pair<audio_channel_mask_t, int>;
+using AudioChannelBitPairs = std::vector<AudioChannelBitPair>;
+using AudioChannelPair = std::pair<audio_channel_mask_t, AudioChannelLayout>;
+using AudioChannelPairs = std::vector<AudioChannelPair>;
+using AudioDevicePair = std::pair<audio_devices_t, AudioDeviceDescription>;
+using AudioDevicePairs = std::vector<AudioDevicePair>;
+using AudioFormatPair = std::pair<audio_format_t, AudioFormatDescription>;
+using AudioFormatPairs = std::vector<AudioFormatPair>;
+}
+
+const detail::AudioChannelBitPairs& getInAudioChannelBits() {
+    static const detail::AudioChannelBitPairs pairs = {
+        { AUDIO_CHANNEL_IN_LEFT, AudioChannelLayout::CHANNEL_FRONT_LEFT },
+        { AUDIO_CHANNEL_IN_RIGHT, AudioChannelLayout::CHANNEL_FRONT_RIGHT },
+        // AUDIO_CHANNEL_IN_FRONT is at the end
+        { AUDIO_CHANNEL_IN_BACK, AudioChannelLayout::CHANNEL_BACK_CENTER },
+        // AUDIO_CHANNEL_IN_*_PROCESSED not supported
+        // AUDIO_CHANNEL_IN_PRESSURE not supported
+        // AUDIO_CHANNEL_IN_*_AXIS not supported
+        // AUDIO_CHANNEL_IN_VOICE_* not supported
+        { AUDIO_CHANNEL_IN_BACK_LEFT, AudioChannelLayout::CHANNEL_BACK_LEFT },
+        { AUDIO_CHANNEL_IN_BACK_RIGHT, AudioChannelLayout::CHANNEL_BACK_RIGHT },
+        { AUDIO_CHANNEL_IN_CENTER, AudioChannelLayout::CHANNEL_FRONT_CENTER },
+        { AUDIO_CHANNEL_IN_LOW_FREQUENCY, AudioChannelLayout::CHANNEL_LOW_FREQUENCY },
+        { AUDIO_CHANNEL_IN_TOP_LEFT, AudioChannelLayout::CHANNEL_TOP_SIDE_LEFT },
+        { AUDIO_CHANNEL_IN_TOP_RIGHT, AudioChannelLayout::CHANNEL_TOP_SIDE_RIGHT },
+        // When going from aidl to legacy, IN_CENTER is used
+        { AUDIO_CHANNEL_IN_FRONT, AudioChannelLayout::CHANNEL_FRONT_CENTER }
+    };
+    return pairs;
+}
+
+const detail::AudioChannelPairs& getInAudioChannelPairs() {
+    static const detail::AudioChannelPairs pairs = {
+#define DEFINE_INPUT_LAYOUT(n)                                                 \
+            {                                                                  \
+                AUDIO_CHANNEL_IN_##n,                                          \
+                AudioChannelLayout::make<AudioChannelLayout::Tag::layoutMask>( \
+                        AudioChannelLayout::LAYOUT_##n)                        \
+            }
+
+        DEFINE_INPUT_LAYOUT(MONO),
+        DEFINE_INPUT_LAYOUT(STEREO),
+        DEFINE_INPUT_LAYOUT(FRONT_BACK),
+        // AUDIO_CHANNEL_IN_6 not supported
+        DEFINE_INPUT_LAYOUT(2POINT0POINT2),
+        DEFINE_INPUT_LAYOUT(2POINT1POINT2),
+        DEFINE_INPUT_LAYOUT(3POINT0POINT2),
+        DEFINE_INPUT_LAYOUT(3POINT1POINT2),
+        DEFINE_INPUT_LAYOUT(5POINT1)
+#undef DEFINE_INPUT_LAYOUT
+    };
+    return pairs;
+}
+
+const detail::AudioChannelBitPairs& getOutAudioChannelBits() {
+    static const detail::AudioChannelBitPairs pairs = {
+#define DEFINE_OUTPUT_BITS(n)                                                  \
+            { AUDIO_CHANNEL_OUT_##n, AudioChannelLayout::CHANNEL_##n }
+
+        DEFINE_OUTPUT_BITS(FRONT_LEFT),
+        DEFINE_OUTPUT_BITS(FRONT_RIGHT),
+        DEFINE_OUTPUT_BITS(FRONT_CENTER),
+        DEFINE_OUTPUT_BITS(LOW_FREQUENCY),
+        DEFINE_OUTPUT_BITS(BACK_LEFT),
+        DEFINE_OUTPUT_BITS(BACK_RIGHT),
+        DEFINE_OUTPUT_BITS(FRONT_LEFT_OF_CENTER),
+        DEFINE_OUTPUT_BITS(FRONT_RIGHT_OF_CENTER),
+        DEFINE_OUTPUT_BITS(BACK_CENTER),
+        DEFINE_OUTPUT_BITS(SIDE_LEFT),
+        DEFINE_OUTPUT_BITS(SIDE_RIGHT),
+        DEFINE_OUTPUT_BITS(TOP_CENTER),
+        DEFINE_OUTPUT_BITS(TOP_FRONT_LEFT),
+        DEFINE_OUTPUT_BITS(TOP_FRONT_CENTER),
+        DEFINE_OUTPUT_BITS(TOP_FRONT_RIGHT),
+        DEFINE_OUTPUT_BITS(TOP_BACK_LEFT),
+        DEFINE_OUTPUT_BITS(TOP_BACK_CENTER),
+        DEFINE_OUTPUT_BITS(TOP_BACK_RIGHT),
+        DEFINE_OUTPUT_BITS(TOP_SIDE_LEFT),
+        DEFINE_OUTPUT_BITS(TOP_SIDE_RIGHT),
+        DEFINE_OUTPUT_BITS(BOTTOM_FRONT_LEFT),
+        DEFINE_OUTPUT_BITS(BOTTOM_FRONT_CENTER),
+        DEFINE_OUTPUT_BITS(BOTTOM_FRONT_RIGHT),
+        DEFINE_OUTPUT_BITS(LOW_FREQUENCY_2),
+        DEFINE_OUTPUT_BITS(FRONT_WIDE_LEFT),
+        DEFINE_OUTPUT_BITS(FRONT_WIDE_RIGHT),
+#undef DEFINE_OUTPUT_BITS
+        { AUDIO_CHANNEL_OUT_HAPTIC_A, AudioChannelLayout::CHANNEL_HAPTIC_A },
+        { AUDIO_CHANNEL_OUT_HAPTIC_B, AudioChannelLayout::CHANNEL_HAPTIC_B }
+    };
+    return pairs;
+}
+
+const detail::AudioChannelPairs& getOutAudioChannelPairs() {
+    static const detail::AudioChannelPairs pairs = {
+#define DEFINE_OUTPUT_LAYOUT(n)                                                \
+            {                                                                  \
+                AUDIO_CHANNEL_OUT_##n,                                         \
+                AudioChannelLayout::make<AudioChannelLayout::Tag::layoutMask>( \
+                        AudioChannelLayout::LAYOUT_##n)                        \
+            }
+
+        DEFINE_OUTPUT_LAYOUT(MONO),
+        DEFINE_OUTPUT_LAYOUT(STEREO),
+        DEFINE_OUTPUT_LAYOUT(2POINT1),
+        DEFINE_OUTPUT_LAYOUT(TRI),
+        DEFINE_OUTPUT_LAYOUT(TRI_BACK),
+        DEFINE_OUTPUT_LAYOUT(3POINT1),
+        DEFINE_OUTPUT_LAYOUT(2POINT0POINT2),
+        DEFINE_OUTPUT_LAYOUT(2POINT1POINT2),
+        DEFINE_OUTPUT_LAYOUT(3POINT0POINT2),
+        DEFINE_OUTPUT_LAYOUT(3POINT1POINT2),
+        DEFINE_OUTPUT_LAYOUT(QUAD),
+        DEFINE_OUTPUT_LAYOUT(QUAD_SIDE),
+        DEFINE_OUTPUT_LAYOUT(SURROUND),
+        DEFINE_OUTPUT_LAYOUT(PENTA),
+        DEFINE_OUTPUT_LAYOUT(5POINT1),
+        DEFINE_OUTPUT_LAYOUT(5POINT1_SIDE),
+        DEFINE_OUTPUT_LAYOUT(5POINT1POINT2),
+        DEFINE_OUTPUT_LAYOUT(5POINT1POINT4),
+        DEFINE_OUTPUT_LAYOUT(6POINT1),
+        DEFINE_OUTPUT_LAYOUT(7POINT1),
+        DEFINE_OUTPUT_LAYOUT(7POINT1POINT2),
+        DEFINE_OUTPUT_LAYOUT(7POINT1POINT4),
+        DEFINE_OUTPUT_LAYOUT(13POINT_360RA),
+        DEFINE_OUTPUT_LAYOUT(22POINT2),
+        DEFINE_OUTPUT_LAYOUT(MONO_HAPTIC_A),
+        DEFINE_OUTPUT_LAYOUT(STEREO_HAPTIC_A),
+        DEFINE_OUTPUT_LAYOUT(HAPTIC_AB),
+        DEFINE_OUTPUT_LAYOUT(MONO_HAPTIC_AB),
+        DEFINE_OUTPUT_LAYOUT(STEREO_HAPTIC_AB)
+#undef DEFINE_OUTPUT_LAYOUT
+    };
+    return pairs;
+}
+
+const detail::AudioChannelPairs& getVoiceAudioChannelPairs() {
+    static const detail::AudioChannelPairs pairs = {
+#define DEFINE_VOICE_LAYOUT(n)                                                 \
+            {                                                                  \
+                AUDIO_CHANNEL_IN_VOICE_##n,                                    \
+                AudioChannelLayout::make<AudioChannelLayout::Tag::voiceMask>(  \
+                        AudioChannelLayout::VOICE_##n)                         \
+            }
+        DEFINE_VOICE_LAYOUT(UPLINK_MONO),
+        DEFINE_VOICE_LAYOUT(DNLINK_MONO),
+        DEFINE_VOICE_LAYOUT(CALL_MONO)
+#undef DEFINE_VOICE_LAYOUT
+    };
+    return pairs;
+}
+
+AudioDeviceDescription make_AudioDeviceDescription(AudioDeviceType type,
+        const std::string& connection = "") {
+    AudioDeviceDescription result;
+    result.type = type;
+    result.connection = connection;
+    return result;
+}
+
+void append_AudioDeviceDescription(detail::AudioDevicePairs& pairs,
+        audio_devices_t inputType, audio_devices_t outputType,
+        AudioDeviceType inType, AudioDeviceType outType,
+        const std::string& connection = "") {
+    pairs.push_back(std::make_pair(inputType, make_AudioDeviceDescription(inType, connection)));
+    pairs.push_back(std::make_pair(outputType, make_AudioDeviceDescription(outType, connection)));
+}
+
+const detail::AudioDevicePairs& getAudioDevicePairs() {
+    static const detail::AudioDevicePairs pairs = []() {
+        detail::AudioDevicePairs pairs = {{
+            {
+                AUDIO_DEVICE_NONE, AudioDeviceDescription{}
+            },
+            {
+                AUDIO_DEVICE_OUT_EARPIECE, make_AudioDeviceDescription(
+                        AudioDeviceType::OUT_SPEAKER_EARPIECE)
+            },
+            {
+                AUDIO_DEVICE_OUT_SPEAKER, make_AudioDeviceDescription(
+                        AudioDeviceType::OUT_SPEAKER)
+            },
+            {
+                AUDIO_DEVICE_OUT_WIRED_HEADPHONE, make_AudioDeviceDescription(
+                        AudioDeviceType::OUT_HEADPHONE,
+                        GET_DEVICE_DESC_CONNECTION(ANALOG))
+            },
+            {
+                AUDIO_DEVICE_OUT_BLUETOOTH_SCO, make_AudioDeviceDescription(
+                        AudioDeviceType::OUT_DEVICE,
+                        GET_DEVICE_DESC_CONNECTION(BT_SCO))
+            },
+            {
+                AUDIO_DEVICE_OUT_BLUETOOTH_SCO_CARKIT, make_AudioDeviceDescription(
+                        AudioDeviceType::OUT_CARKIT,
+                        GET_DEVICE_DESC_CONNECTION(BT_SCO))
+            },
+            {
+                AUDIO_DEVICE_OUT_BLUETOOTH_A2DP_HEADPHONES, make_AudioDeviceDescription(
+                        AudioDeviceType::OUT_HEADPHONE,
+                        GET_DEVICE_DESC_CONNECTION(BT_A2DP))
+            },
+            {
+                AUDIO_DEVICE_OUT_BLUETOOTH_A2DP_SPEAKER, make_AudioDeviceDescription(
+                        AudioDeviceType::OUT_SPEAKER,
+                        GET_DEVICE_DESC_CONNECTION(BT_A2DP))
+            },
+            {
+                AUDIO_DEVICE_OUT_TELEPHONY_TX, make_AudioDeviceDescription(
+                        AudioDeviceType::OUT_TELEPHONY_TX)
+            },
+            {
+                AUDIO_DEVICE_OUT_AUX_LINE, make_AudioDeviceDescription(
+                        AudioDeviceType::OUT_LINE_AUX)
+            },
+            {
+                AUDIO_DEVICE_OUT_SPEAKER_SAFE, make_AudioDeviceDescription(
+                        AudioDeviceType::OUT_SPEAKER_SAFE)
+            },
+            {
+                AUDIO_DEVICE_OUT_HEARING_AID, make_AudioDeviceDescription(
+                        AudioDeviceType::OUT_HEARING_AID,
+                        GET_DEVICE_DESC_CONNECTION(WIRELESS))
+            },
+            {
+                AUDIO_DEVICE_OUT_ECHO_CANCELLER, make_AudioDeviceDescription(
+                        AudioDeviceType::OUT_ECHO_CANCELLER)
+            },
+            {
+                AUDIO_DEVICE_OUT_BLE_SPEAKER, make_AudioDeviceDescription(
+                        AudioDeviceType::OUT_SPEAKER,
+                        GET_DEVICE_DESC_CONNECTION(BT_LE))
+            },
+            {
+                AUDIO_DEVICE_OUT_BLE_BROADCAST, make_AudioDeviceDescription(
+                        AudioDeviceType::OUT_BROADCAST,
+                        GET_DEVICE_DESC_CONNECTION(BT_LE))
+            },
+            // AUDIO_DEVICE_IN_AMBIENT and IN_COMMUNICATION are removed since they were deprecated.
+            {
+                AUDIO_DEVICE_IN_BUILTIN_MIC, make_AudioDeviceDescription(
+                        AudioDeviceType::IN_MICROPHONE)
+            },
+            {
+                AUDIO_DEVICE_IN_BACK_MIC, make_AudioDeviceDescription(
+                        AudioDeviceType::IN_MICROPHONE_BACK)
+            },
+            {
+                AUDIO_DEVICE_IN_TELEPHONY_RX, make_AudioDeviceDescription(
+                        AudioDeviceType::IN_TELEPHONY_RX)
+            },
+            {
+                AUDIO_DEVICE_IN_TV_TUNER, make_AudioDeviceDescription(
+                        AudioDeviceType::IN_TV_TUNER)
+            },
+            {
+                AUDIO_DEVICE_IN_LOOPBACK, make_AudioDeviceDescription(
+                        AudioDeviceType::IN_LOOPBACK)
+            },
+            {
+                AUDIO_DEVICE_IN_BLUETOOTH_BLE, make_AudioDeviceDescription(
+                        AudioDeviceType::IN_DEVICE,
+                        GET_DEVICE_DESC_CONNECTION(BT_LE))
+            },
+            {
+                AUDIO_DEVICE_IN_ECHO_REFERENCE, make_AudioDeviceDescription(
+                        AudioDeviceType::IN_ECHO_REFERENCE)
+            }
+        }};
+        append_AudioDeviceDescription(pairs,
+                AUDIO_DEVICE_IN_DEFAULT, AUDIO_DEVICE_OUT_DEFAULT,
+                AudioDeviceType::IN_DEFAULT, AudioDeviceType::OUT_DEFAULT);
+        append_AudioDeviceDescription(pairs,
+                AUDIO_DEVICE_IN_WIRED_HEADSET, AUDIO_DEVICE_OUT_WIRED_HEADSET,
+                AudioDeviceType::IN_HEADSET, AudioDeviceType::OUT_HEADSET,
+                GET_DEVICE_DESC_CONNECTION(ANALOG));
+        append_AudioDeviceDescription(pairs,
+                AUDIO_DEVICE_IN_BLUETOOTH_SCO_HEADSET, AUDIO_DEVICE_OUT_BLUETOOTH_SCO_HEADSET,
+                AudioDeviceType::IN_HEADSET, AudioDeviceType::OUT_HEADSET,
+                GET_DEVICE_DESC_CONNECTION(BT_SCO));
+        append_AudioDeviceDescription(pairs,
+                AUDIO_DEVICE_IN_HDMI, AUDIO_DEVICE_OUT_HDMI,
+                AudioDeviceType::IN_DEVICE, AudioDeviceType::OUT_DEVICE,
+                GET_DEVICE_DESC_CONNECTION(HDMI));
+        append_AudioDeviceDescription(pairs,
+                AUDIO_DEVICE_IN_REMOTE_SUBMIX, AUDIO_DEVICE_OUT_REMOTE_SUBMIX,
+                AudioDeviceType::IN_SUBMIX, AudioDeviceType::OUT_SUBMIX);
+        append_AudioDeviceDescription(pairs,
+                AUDIO_DEVICE_IN_ANLG_DOCK_HEADSET, AUDIO_DEVICE_OUT_ANLG_DOCK_HEADSET,
+                AudioDeviceType::IN_DOCK, AudioDeviceType::OUT_DOCK,
+                GET_DEVICE_DESC_CONNECTION(ANALOG));
+        append_AudioDeviceDescription(pairs,
+                AUDIO_DEVICE_IN_DGTL_DOCK_HEADSET, AUDIO_DEVICE_OUT_DGTL_DOCK_HEADSET,
+                AudioDeviceType::IN_DOCK, AudioDeviceType::OUT_DOCK,
+                GET_DEVICE_DESC_CONNECTION(USB));
+        append_AudioDeviceDescription(pairs,
+                AUDIO_DEVICE_IN_USB_ACCESSORY, AUDIO_DEVICE_OUT_USB_ACCESSORY,
+                AudioDeviceType::IN_ACCESSORY, AudioDeviceType::OUT_ACCESSORY,
+                GET_DEVICE_DESC_CONNECTION(USB));
+        append_AudioDeviceDescription(pairs,
+                AUDIO_DEVICE_IN_USB_DEVICE, AUDIO_DEVICE_OUT_USB_DEVICE,
+                AudioDeviceType::IN_DEVICE, AudioDeviceType::OUT_DEVICE,
+                GET_DEVICE_DESC_CONNECTION(USB));
+        append_AudioDeviceDescription(pairs,
+                AUDIO_DEVICE_IN_FM_TUNER, AUDIO_DEVICE_OUT_FM,
+                AudioDeviceType::IN_FM_TUNER, AudioDeviceType::OUT_FM);
+        append_AudioDeviceDescription(pairs,
+                AUDIO_DEVICE_IN_LINE, AUDIO_DEVICE_OUT_LINE,
+                AudioDeviceType::IN_DEVICE, AudioDeviceType::OUT_DEVICE,
+                GET_DEVICE_DESC_CONNECTION(ANALOG));
+        append_AudioDeviceDescription(pairs,
+                AUDIO_DEVICE_IN_SPDIF, AUDIO_DEVICE_OUT_SPDIF,
+                AudioDeviceType::IN_DEVICE, AudioDeviceType::OUT_DEVICE,
+                GET_DEVICE_DESC_CONNECTION(SPDIF));
+        append_AudioDeviceDescription(pairs,
+                AUDIO_DEVICE_IN_BLUETOOTH_A2DP, AUDIO_DEVICE_OUT_BLUETOOTH_A2DP,
+                AudioDeviceType::IN_DEVICE, AudioDeviceType::OUT_DEVICE,
+                GET_DEVICE_DESC_CONNECTION(BT_A2DP));
+        append_AudioDeviceDescription(pairs,
+                AUDIO_DEVICE_IN_IP, AUDIO_DEVICE_OUT_IP,
+                AudioDeviceType::IN_DEVICE, AudioDeviceType::OUT_DEVICE,
+                GET_DEVICE_DESC_CONNECTION(IP_V4));
+        append_AudioDeviceDescription(pairs,
+                AUDIO_DEVICE_IN_BUS, AUDIO_DEVICE_OUT_BUS,
+                AudioDeviceType::IN_DEVICE, AudioDeviceType::OUT_DEVICE,
+                GET_DEVICE_DESC_CONNECTION(BUS));
+        append_AudioDeviceDescription(pairs,
+                AUDIO_DEVICE_IN_PROXY, AUDIO_DEVICE_OUT_PROXY,
+                AudioDeviceType::IN_AFE_PROXY, AudioDeviceType::OUT_AFE_PROXY);
+        append_AudioDeviceDescription(pairs,
+                AUDIO_DEVICE_IN_USB_HEADSET, AUDIO_DEVICE_OUT_USB_HEADSET,
+                AudioDeviceType::IN_HEADSET, AudioDeviceType::OUT_HEADSET,
+                GET_DEVICE_DESC_CONNECTION(USB));
+        append_AudioDeviceDescription(pairs,
+                AUDIO_DEVICE_IN_HDMI_ARC, AUDIO_DEVICE_OUT_HDMI_ARC,
+                AudioDeviceType::IN_DEVICE, AudioDeviceType::OUT_DEVICE,
+                GET_DEVICE_DESC_CONNECTION(HDMI_ARC));
+        append_AudioDeviceDescription(pairs,
+                AUDIO_DEVICE_IN_HDMI_EARC, AUDIO_DEVICE_OUT_HDMI_EARC,
+                AudioDeviceType::IN_DEVICE, AudioDeviceType::OUT_DEVICE,
+                GET_DEVICE_DESC_CONNECTION(HDMI_EARC));
+        append_AudioDeviceDescription(pairs,
+                AUDIO_DEVICE_IN_BLE_HEADSET, AUDIO_DEVICE_OUT_BLE_HEADSET,
+                AudioDeviceType::IN_HEADSET, AudioDeviceType::OUT_HEADSET,
+                GET_DEVICE_DESC_CONNECTION(BT_LE));
+        return pairs;
+    }();
+#undef GET_DEVICE_DESC_CONNECTION
+    return pairs;
+}
+
+AudioFormatDescription make_AudioFormatDescription(AudioFormatType type) {
+    AudioFormatDescription result;
+    result.type = type;
+    return result;
+}
+
+AudioFormatDescription make_AudioFormatDescription(PcmType pcm) {
+    auto result = make_AudioFormatDescription(AudioFormatType::PCM);
+    result.pcm = pcm;
+    return result;
+}
+
+AudioFormatDescription make_AudioFormatDescription(const std::string& encoding) {
+    AudioFormatDescription result;
+    result.encoding = encoding;
+    return result;
+}
+
+AudioFormatDescription make_AudioFormatDescription(PcmType transport,
+        const std::string& encoding) {
+    auto result = make_AudioFormatDescription(encoding);
+    result.pcm = transport;
+    return result;
+}
+
+const detail::AudioFormatPairs& getAudioFormatPairs() {
+    static const detail::AudioFormatPairs pairs = {{
+            {AUDIO_FORMAT_INVALID,
+             make_AudioFormatDescription(AudioFormatType::SYS_RESERVED_INVALID)},
+            {AUDIO_FORMAT_DEFAULT, AudioFormatDescription{}},
+            {AUDIO_FORMAT_PCM_16_BIT, make_AudioFormatDescription(PcmType::INT_16_BIT)},
+            {AUDIO_FORMAT_PCM_8_BIT, make_AudioFormatDescription(PcmType::UINT_8_BIT)},
+            {AUDIO_FORMAT_PCM_32_BIT, make_AudioFormatDescription(PcmType::INT_32_BIT)},
+            {AUDIO_FORMAT_PCM_8_24_BIT, make_AudioFormatDescription(PcmType::FIXED_Q_8_24)},
+            {AUDIO_FORMAT_PCM_FLOAT, make_AudioFormatDescription(PcmType::FLOAT_32_BIT)},
+            {AUDIO_FORMAT_PCM_24_BIT_PACKED, make_AudioFormatDescription(PcmType::INT_24_BIT)},
+            {AUDIO_FORMAT_MP3, make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_MPEG)},
+            {AUDIO_FORMAT_AMR_NB,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_AMR_NB)},
+            {AUDIO_FORMAT_AMR_WB,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_AMR_WB)},
+            {AUDIO_FORMAT_AAC,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_AAC_MP4)},
+            {AUDIO_FORMAT_AAC_MAIN,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_AAC_MAIN)},
+            {AUDIO_FORMAT_AAC_LC,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_AAC_LC)},
+            {AUDIO_FORMAT_AAC_SSR,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_AAC_SSR)},
+            {AUDIO_FORMAT_AAC_LTP,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_AAC_LTP)},
+            {AUDIO_FORMAT_AAC_HE_V1,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_AAC_HE_V1)},
+            {AUDIO_FORMAT_AAC_SCALABLE,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_AAC_SCALABLE)},
+            {AUDIO_FORMAT_AAC_ERLC,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_AAC_ERLC)},
+            {AUDIO_FORMAT_AAC_LD,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_AAC_LD)},
+            {AUDIO_FORMAT_AAC_HE_V2,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_AAC_HE_V2)},
+            {AUDIO_FORMAT_AAC_ELD,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_AAC_ELD)},
+            {AUDIO_FORMAT_AAC_XHE,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_AAC_XHE)
+
+            },
+            // AUDIO_FORMAT_HE_AAC_V1 and HE_AAC_V2 are removed since they were deprecated long time
+            // ago.
+            {AUDIO_FORMAT_VORBIS,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_VORBIS)},
+            {AUDIO_FORMAT_OPUS, make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_OPUS)},
+            {AUDIO_FORMAT_AC3, make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_AC3)},
+            {AUDIO_FORMAT_E_AC3, make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_EAC3)},
+            {AUDIO_FORMAT_E_AC3_JOC,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_EAC3_JOC)},
+            {AUDIO_FORMAT_DTS, make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_DTS)},
+            {AUDIO_FORMAT_DTS_HD,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_DTS_HD)},
+            {AUDIO_FORMAT_DTS_HD_MA,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_DTS_HD_MA)},
+            {AUDIO_FORMAT_DTS_UHD,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_DTS_UHD_P1)},
+            {AUDIO_FORMAT_DTS_UHD_P2,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_DTS_UHD_P2)},
+            // In the future, we would like to represent encapsulated bitstreams as
+            // nested AudioFormatDescriptions. The legacy 'AUDIO_FORMAT_IEC61937' type doesn't
+            // specify the format of the encapsulated bitstream.
+            {AUDIO_FORMAT_IEC61937,
+             make_AudioFormatDescription(PcmType::INT_16_BIT,
+                                         ::android::MEDIA_MIMETYPE_AUDIO_IEC61937)},
+            {AUDIO_FORMAT_DOLBY_TRUEHD,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_DOLBY_TRUEHD)},
+            {AUDIO_FORMAT_EVRC, make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_EVRC)},
+            {AUDIO_FORMAT_EVRCB,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_EVRCB)},
+            {AUDIO_FORMAT_EVRCWB,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_EVRCWB)},
+            {AUDIO_FORMAT_EVRCNW,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_EVRCNW)},
+            {AUDIO_FORMAT_AAC_ADIF,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_AAC_ADIF)},
+            {AUDIO_FORMAT_WMA, make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_WMA)},
+            {// Note: not in the IANA registry.
+             AUDIO_FORMAT_WMA_PRO, make_AudioFormatDescription("audio/x-ms-wma.pro")},
+            {AUDIO_FORMAT_AMR_WB_PLUS,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_AMR_WB_PLUS)},
+            {AUDIO_FORMAT_MP2,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_MPEG_LAYER_II)},
+            {AUDIO_FORMAT_QCELP,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_QCELP)},
+            {// Note: not in the IANA registry.
+             AUDIO_FORMAT_DSD, make_AudioFormatDescription("audio/vnd.sony.dsd")},
+            {AUDIO_FORMAT_FLAC, make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_FLAC)},
+            {AUDIO_FORMAT_ALAC, make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_ALAC)},
+            {// Note: not in the IANA registry.
+             AUDIO_FORMAT_APE, make_AudioFormatDescription("audio/x-ape")},
+            {AUDIO_FORMAT_AAC_ADTS,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_AAC_ADTS)},
+            {AUDIO_FORMAT_AAC_ADTS_MAIN,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_AAC_ADTS_MAIN)},
+            {AUDIO_FORMAT_AAC_ADTS_LC,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_AAC_ADTS_LC)},
+            {AUDIO_FORMAT_AAC_ADTS_SSR,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_AAC_ADTS_SSR)},
+            {AUDIO_FORMAT_AAC_ADTS_LTP,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_AAC_ADTS_LTP)},
+            {AUDIO_FORMAT_AAC_ADTS_HE_V1,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_AAC_ADTS_HE_V1)},
+            {AUDIO_FORMAT_AAC_ADTS_SCALABLE,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_AAC_ADTS_SCALABLE)},
+            {AUDIO_FORMAT_AAC_ADTS_ERLC,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_AAC_ADTS_ERLC)},
+            {AUDIO_FORMAT_AAC_ADTS_LD,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_AAC_ADTS_LD)},
+            {AUDIO_FORMAT_AAC_ADTS_HE_V2,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_AAC_ADTS_HE_V2)},
+            {AUDIO_FORMAT_AAC_ADTS_ELD,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_AAC_ADTS_ELD)},
+            {AUDIO_FORMAT_AAC_ADTS_XHE,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_AAC_ADTS_XHE)},
+            {// Note: not in the IANA registry. "vnd.octel.sbc" is not BT SBC.
+             AUDIO_FORMAT_SBC, make_AudioFormatDescription("audio/x-sbc")},
+            {AUDIO_FORMAT_APTX, make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_APTX)},
+            {// Note: not in the IANA registry.
+             AUDIO_FORMAT_APTX_HD, make_AudioFormatDescription("audio/vnd.qcom.aptx.hd")},
+            {AUDIO_FORMAT_AC4, make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_AC4)},
+            {// Note: not in the IANA registry.
+             AUDIO_FORMAT_LDAC, make_AudioFormatDescription("audio/vnd.sony.ldac")},
+            {AUDIO_FORMAT_MAT,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_DOLBY_MAT)},
+            {// Note: not in the IANA registry.
+             AUDIO_FORMAT_MAT_1_0,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_DOLBY_MAT +
+                                         std::string(".1.0"))},
+            {// Note: not in the IANA registry.
+             AUDIO_FORMAT_MAT_2_0,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_DOLBY_MAT +
+                                         std::string(".2.0"))},
+            {// Note: not in the IANA registry.
+             AUDIO_FORMAT_MAT_2_1,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_DOLBY_MAT +
+                                         std::string(".2.1"))},
+            {AUDIO_FORMAT_AAC_LATM,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_AAC)},
+            {AUDIO_FORMAT_AAC_LATM_LC,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_AAC_LATM_LC)},
+            {AUDIO_FORMAT_AAC_LATM_HE_V1,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_AAC_LATM_HE_V1)},
+            {AUDIO_FORMAT_AAC_LATM_HE_V2,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_AAC_LATM_HE_V2)},
+            {// Note: not in the IANA registry.
+             AUDIO_FORMAT_CELT, make_AudioFormatDescription("audio/x-celt")},
+            {// Note: not in the IANA registry.
+             AUDIO_FORMAT_APTX_ADAPTIVE,
+             make_AudioFormatDescription("audio/vnd.qcom.aptx.adaptive")},
+            {// Note: not in the IANA registry.
+             AUDIO_FORMAT_LHDC, make_AudioFormatDescription("audio/vnd.savitech.lhdc")},
+            {// Note: not in the IANA registry.
+             AUDIO_FORMAT_LHDC_LL, make_AudioFormatDescription("audio/vnd.savitech.lhdc.ll")},
+            {// Note: not in the IANA registry.
+             AUDIO_FORMAT_APTX_TWSP, make_AudioFormatDescription("audio/vnd.qcom.aptx.twsp")},
+            {// Note: not in the IANA registry.
+             AUDIO_FORMAT_LC3, make_AudioFormatDescription("audio/x-lc3")},
+            {AUDIO_FORMAT_MPEGH,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_MPEGH_MHM1)},
+            {AUDIO_FORMAT_MPEGH_BL_L3,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_MPEGH_BL_L3)},
+            {AUDIO_FORMAT_MPEGH_BL_L4,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_MPEGH_BL_L4)},
+            {AUDIO_FORMAT_MPEGH_LC_L3,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_MPEGH_LC_L3)},
+            {AUDIO_FORMAT_MPEGH_LC_L4,
+             make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_MPEGH_LC_L4)},
+            {AUDIO_FORMAT_IEC60958,
+             make_AudioFormatDescription(PcmType::INT_24_BIT,
+                                         ::android::MEDIA_MIMETYPE_AUDIO_IEC60958)},
+            {AUDIO_FORMAT_DRA, make_AudioFormatDescription(::android::MEDIA_MIMETYPE_AUDIO_DRA)},
+            {// Note: not in the IANA registry.
+             AUDIO_FORMAT_APTX_ADAPTIVE_QLEA,
+             make_AudioFormatDescription("audio/vnd.qcom.aptx.adaptive.r3")},
+            {// Note: not in the IANA registry.
+             AUDIO_FORMAT_APTX_ADAPTIVE_R4,
+             make_AudioFormatDescription("audio/vnd.qcom.aptx.adaptive.r4")},
+    }};
+    return pairs;
+}
+
+template<typename S, typename T>
+std::map<S, T> make_DirectMap(const std::vector<std::pair<S, T>>& v) {
+    std::map<S, T> result(v.begin(), v.end());
+    LOG_ALWAYS_FATAL_IF(result.size() != v.size(), "Duplicate key elements detected");
+    return result;
+}
+
+template<typename S, typename T>
+std::map<S, T> make_DirectMap(
+        const std::vector<std::pair<S, T>>& v1, const std::vector<std::pair<S, T>>& v2) {
+    std::map<S, T> result(v1.begin(), v1.end());
+    LOG_ALWAYS_FATAL_IF(result.size() != v1.size(), "Duplicate key elements detected in v1");
+    result.insert(v2.begin(), v2.end());
+    LOG_ALWAYS_FATAL_IF(result.size() != v1.size() + v2.size(),
+            "Duplicate key elements detected in v1+v2");
+    return result;
+}
+
+template<typename S, typename T>
+std::map<T, S> make_ReverseMap(const std::vector<std::pair<S, T>>& v) {
+    std::map<T, S> result;
+    std::transform(v.begin(), v.end(), std::inserter(result, result.begin()),
+            [](const std::pair<S, T>& p) {
+                return std::make_pair(p.second, p.first);
+            });
+    LOG_ALWAYS_FATAL_IF(result.size() != v.size(), "Duplicate key elements detected");
+    return result;
+}
+
+}  // namespace
+
+audio_channel_mask_t aidl2legacy_AudioChannelLayout_layout_audio_channel_mask_t_bits(
+        int aidlLayout, bool isInput) {
+    auto& bitMapping = isInput ? getInAudioChannelBits() : getOutAudioChannelBits();
+    const int aidlLayoutInitial = aidlLayout; // for error message
+    audio_channel_mask_t legacy = AUDIO_CHANNEL_NONE;
+    for (const auto& bitPair : bitMapping) {
+        if ((aidlLayout & bitPair.second) == bitPair.second) {
+            legacy = static_cast<audio_channel_mask_t>(legacy | bitPair.first);
+            aidlLayout &= ~bitPair.second;
+            if (aidlLayout == 0) {
+                return legacy;
+            }
+        }
+    }
+    ALOGE("%s: aidl layout 0x%x contains bits 0x%x that have no match to legacy %s bits",
+            __func__, aidlLayoutInitial, aidlLayout, isInput ? "input" : "output");
+    return AUDIO_CHANNEL_NONE;
+}
+
+ConversionResult<audio_channel_mask_t> aidl2legacy_AudioChannelLayout_audio_channel_mask_t(
+        const AudioChannelLayout& aidl, bool isInput) {
+    using ReverseMap = std::map<AudioChannelLayout, audio_channel_mask_t>;
+    using Tag = AudioChannelLayout::Tag;
+    static const ReverseMap mIn = make_ReverseMap(getInAudioChannelPairs());
+    static const ReverseMap mOut = make_ReverseMap(getOutAudioChannelPairs());
+    static const ReverseMap mVoice = make_ReverseMap(getVoiceAudioChannelPairs());
+
+    auto convert = [](const AudioChannelLayout& aidl, const ReverseMap& m,
+            const char* func, const char* type) -> ConversionResult<audio_channel_mask_t> {
+        if (auto it = m.find(aidl); it != m.end()) {
+            return it->second;
+        } else {
+            ALOGW("%s: no legacy %s audio_channel_mask_t found for %s", func, type,
+                    aidl.toString().c_str());
+            return unexpected(BAD_VALUE);
+        }
+    };
+
+    switch (aidl.getTag()) {
+        case Tag::none:
+            return AUDIO_CHANNEL_NONE;
+        case Tag::invalid:
+            return AUDIO_CHANNEL_INVALID;
+        case Tag::indexMask:
+            // Index masks do not have pre-defined values.
+            if (const int bits = aidl.get<Tag::indexMask>();
+                    __builtin_popcount(bits) != 0 &&
+                    __builtin_popcount(bits) <= AUDIO_CHANNEL_COUNT_MAX) {
+                return audio_channel_mask_from_representation_and_bits(
+                        AUDIO_CHANNEL_REPRESENTATION_INDEX, bits);
+            } else {
+                ALOGE("%s: invalid indexMask value 0x%x in %s",
+                        __func__, bits, aidl.toString().c_str());
+                return unexpected(BAD_VALUE);
+            }
+        case Tag::layoutMask:
+            // The fast path is to find a direct match for some known layout mask.
+            if (const auto layoutMatch = convert(aidl, isInput ? mIn : mOut, __func__,
+                    isInput ? "input" : "output");
+                    layoutMatch.ok()) {
+                return layoutMatch;
+            }
+            // If a match for a predefined layout wasn't found, make a custom one from bits.
+            if (audio_channel_mask_t bitMask =
+                    aidl2legacy_AudioChannelLayout_layout_audio_channel_mask_t_bits(
+                            aidl.get<Tag::layoutMask>(), isInput);
+                    bitMask != AUDIO_CHANNEL_NONE) {
+                return bitMask;
+            }
+            return unexpected(BAD_VALUE);
+        case Tag::voiceMask:
+            return convert(aidl, mVoice, __func__, "voice");
+    }
+    ALOGE("%s: unexpected tag value %d", __func__, aidl.getTag());
+    return unexpected(BAD_VALUE);
+}
+
+int legacy2aidl_audio_channel_mask_t_bits_AudioChannelLayout_layout(
+        audio_channel_mask_t legacy, bool isInput) {
+    auto& bitMapping = isInput ? getInAudioChannelBits() : getOutAudioChannelBits();
+    const int legacyInitial = legacy; // for error message
+    int aidlLayout = 0;
+    for (const auto& bitPair : bitMapping) {
+        if ((legacy & bitPair.first) == bitPair.first) {
+            aidlLayout |= bitPair.second;
+            legacy = static_cast<audio_channel_mask_t>(legacy & ~bitPair.first);
+            if (legacy == 0) {
+                return aidlLayout;
+            }
+        }
+    }
+    ALOGE("%s: legacy %s audio_channel_mask_t 0x%x contains unrecognized bits 0x%x",
+            __func__, isInput ? "input" : "output", legacyInitial, legacy);
+    return 0;
+}
+
+ConversionResult<AudioChannelLayout> legacy2aidl_audio_channel_mask_t_AudioChannelLayout(
+        audio_channel_mask_t legacy, bool isInput) {
+    using DirectMap = std::map<audio_channel_mask_t, AudioChannelLayout>;
+    using Tag = AudioChannelLayout::Tag;
+    static const DirectMap mInAndVoice = make_DirectMap(
+            getInAudioChannelPairs(), getVoiceAudioChannelPairs());
+    static const DirectMap mOut = make_DirectMap(getOutAudioChannelPairs());
+
+    auto convert = [](const audio_channel_mask_t legacy, const DirectMap& m,
+            const char* func, const char* type) -> ConversionResult<AudioChannelLayout> {
+        if (auto it = m.find(legacy); it != m.end()) {
+            return it->second;
+        } else {
+            ALOGW("%s: no AudioChannelLayout found for legacy %s audio_channel_mask_t value 0x%x",
+                    func, type, legacy);
+            return unexpected(BAD_VALUE);
+        }
+    };
+
+    if (legacy == AUDIO_CHANNEL_NONE) {
+        return AudioChannelLayout{};
+    } else if (legacy == AUDIO_CHANNEL_INVALID) {
+        return AudioChannelLayout::make<Tag::invalid>(0);
+    }
+
+    const audio_channel_representation_t repr = audio_channel_mask_get_representation(legacy);
+    if (repr == AUDIO_CHANNEL_REPRESENTATION_INDEX) {
+        if (audio_channel_mask_is_valid(legacy)) {
+            const int indexMask = VALUE_OR_RETURN(
+                    convertIntegral<int>(audio_channel_mask_get_bits(legacy)));
+            return AudioChannelLayout::make<Tag::indexMask>(indexMask);
+        } else {
+            ALOGE("%s: legacy audio_channel_mask_t value 0x%x is invalid", __func__, legacy);
+            return unexpected(BAD_VALUE);
+        }
+    } else if (repr == AUDIO_CHANNEL_REPRESENTATION_POSITION) {
+        // The fast path is to find a direct match for some known layout mask.
+        if (const auto layoutMatch = convert(legacy, isInput ? mInAndVoice : mOut, __func__,
+                isInput ? "input / voice" : "output");
+                layoutMatch.ok()) {
+            return layoutMatch;
+        }
+        // If a match for a predefined layout wasn't found, make a custom one from bits,
+        // rejecting those with voice channel bits.
+        if (!isInput ||
+                (legacy & (AUDIO_CHANNEL_IN_VOICE_UPLINK | AUDIO_CHANNEL_IN_VOICE_DNLINK)) == 0) {
+            if (int bitMaskLayout =
+                    legacy2aidl_audio_channel_mask_t_bits_AudioChannelLayout_layout(
+                            legacy, isInput);
+                    bitMaskLayout != 0) {
+                return AudioChannelLayout::make<Tag::layoutMask>(bitMaskLayout);
+            }
+        } else {
+            ALOGE("%s: legacy audio_channel_mask_t value 0x%x contains voice bits",
+                    __func__, legacy);
+        }
+        return unexpected(BAD_VALUE);
+    }
+
+    ALOGE("%s: unknown representation %d in audio_channel_mask_t value 0x%x",
+            __func__, repr, legacy);
+    return unexpected(BAD_VALUE);
+}
+
+ConversionResult<audio_devices_t> aidl2legacy_AudioDeviceDescription_audio_devices_t(
+        const AudioDeviceDescription& aidl) {
+    static const std::map<AudioDeviceDescription, audio_devices_t> m =
+            make_ReverseMap(getAudioDevicePairs());
+    if (auto it = m.find(aidl); it != m.end()) {
+        return it->second;
+    } else {
+        ALOGE("%s: no legacy audio_devices_t found for %s", __func__, aidl.toString().c_str());
+        return unexpected(BAD_VALUE);
+    }
+}
+
+ConversionResult<AudioDeviceDescription> legacy2aidl_audio_devices_t_AudioDeviceDescription(
+        audio_devices_t legacy) {
+    static const std::map<audio_devices_t, AudioDeviceDescription> m =
+            make_DirectMap(getAudioDevicePairs());
+    if (auto it = m.find(legacy); it != m.end()) {
+        return it->second;
+    } else {
+        ALOGE("%s: no AudioDeviceDescription found for legacy audio_devices_t value 0x%x",
+                __func__, legacy);
+        return unexpected(BAD_VALUE);
+    }
+}
+
+::android::status_t aidl2legacy_AudioDevice_audio_device(
+        const AudioDevice& aidl,
+        audio_devices_t* legacyType, char* legacyAddress) {
+    *legacyType = VALUE_OR_RETURN_STATUS(
+            aidl2legacy_AudioDeviceDescription_audio_devices_t(aidl.type));
+    return aidl2legacy_string(
+                    aidl.address.get<AudioDeviceAddress::id>(),
+                    legacyAddress, AUDIO_DEVICE_MAX_ADDRESS_LEN);
+}
+
+::android::status_t aidl2legacy_AudioDevice_audio_device(
+        const AudioDevice& aidl,
+        audio_devices_t* legacyType, String8* legacyAddress) {
+    *legacyType = VALUE_OR_RETURN_STATUS(
+            aidl2legacy_AudioDeviceDescription_audio_devices_t(aidl.type));
+    *legacyAddress = VALUE_OR_RETURN_STATUS(aidl2legacy_string_view_String8(
+                    aidl.address.get<AudioDeviceAddress::id>()));
+    return OK;
+}
+
+::android::status_t aidl2legacy_AudioDevice_audio_device(
+        const AudioDevice& aidl,
+        audio_devices_t* legacyType, std::string* legacyAddress) {
+    *legacyType = VALUE_OR_RETURN_STATUS(
+            aidl2legacy_AudioDeviceDescription_audio_devices_t(aidl.type));
+    *legacyAddress = aidl.address.get<AudioDeviceAddress::id>();
+    return OK;
+}
+
+ConversionResult<AudioDevice> legacy2aidl_audio_device_AudioDevice(
+        audio_devices_t legacyType, const char* legacyAddress) {
+    AudioDevice aidl;
+    aidl.type = VALUE_OR_RETURN(
+            legacy2aidl_audio_devices_t_AudioDeviceDescription(legacyType));
+    const std::string aidl_id = VALUE_OR_RETURN(
+            legacy2aidl_string(legacyAddress, AUDIO_DEVICE_MAX_ADDRESS_LEN));
+    aidl.address = AudioDeviceAddress::make<AudioDeviceAddress::id>(aidl_id);
+    return aidl;
+}
+
+ConversionResult<AudioDevice>
+legacy2aidl_audio_device_AudioDevice(
+        audio_devices_t legacyType, const String8& legacyAddress) {
+    AudioDevice aidl;
+    aidl.type = VALUE_OR_RETURN(
+            legacy2aidl_audio_devices_t_AudioDeviceDescription(legacyType));
+    const std::string aidl_id = VALUE_OR_RETURN(
+            legacy2aidl_String8_string(legacyAddress));
+    aidl.address = AudioDeviceAddress::make<AudioDeviceAddress::id>(aidl_id);
+    return aidl;
+}
+
+ConversionResult<audio_format_t> aidl2legacy_AudioFormatDescription_audio_format_t(
+        const AudioFormatDescription& aidl) {
+    static const std::map<AudioFormatDescription, audio_format_t> m =
+            make_ReverseMap(getAudioFormatPairs());
+    if (auto it = m.find(aidl); it != m.end()) {
+        return it->second;
+    } else {
+        ALOGE("%s: no legacy audio_format_t found for %s", __func__, aidl.toString().c_str());
+        return unexpected(BAD_VALUE);
+    }
+}
+
+ConversionResult<AudioFormatDescription> legacy2aidl_audio_format_t_AudioFormatDescription(
+        audio_format_t legacy) {
+    static const std::map<audio_format_t, AudioFormatDescription> m =
+            make_DirectMap(getAudioFormatPairs());
+    if (auto it = m.find(legacy); it != m.end()) {
+        return it->second;
+    } else {
+        ALOGE("%s: no AudioFormatDescription found for legacy audio_format_t value 0x%x",
+                __func__, legacy);
+        return unexpected(BAD_VALUE);
+    }
+}
+
+ConversionResult<audio_gain_mode_t> aidl2legacy_AudioGainMode_audio_gain_mode_t(
+        AudioGainMode aidl) {
+    switch (aidl) {
+        case AudioGainMode::JOINT:
+            return AUDIO_GAIN_MODE_JOINT;
+        case AudioGainMode::CHANNELS:
+            return AUDIO_GAIN_MODE_CHANNELS;
+        case AudioGainMode::RAMP:
+            return AUDIO_GAIN_MODE_RAMP;
+    }
+    return unexpected(BAD_VALUE);
+}
+
+ConversionResult<AudioGainMode> legacy2aidl_audio_gain_mode_t_AudioGainMode(
+        audio_gain_mode_t legacy) {
+    switch (legacy) {
+        case AUDIO_GAIN_MODE_JOINT:
+            return AudioGainMode::JOINT;
+        case AUDIO_GAIN_MODE_CHANNELS:
+            return AudioGainMode::CHANNELS;
+        case AUDIO_GAIN_MODE_RAMP:
+            return AudioGainMode::RAMP;
+    }
+    return unexpected(BAD_VALUE);
+}
+
+ConversionResult<audio_gain_mode_t> aidl2legacy_int32_t_audio_gain_mode_t_mask(int32_t aidl) {
+    return convertBitmask<audio_gain_mode_t, int32_t, audio_gain_mode_t, AudioGainMode>(
+            aidl, aidl2legacy_AudioGainMode_audio_gain_mode_t,
+            // AudioGainMode is index-based.
+            indexToEnum_index<AudioGainMode>,
+            // AUDIO_GAIN_MODE_* constants are mask-based.
+            enumToMask_bitmask<audio_gain_mode_t, audio_gain_mode_t>);
+}
+
+ConversionResult<int32_t> legacy2aidl_audio_gain_mode_t_int32_t_mask(audio_gain_mode_t legacy) {
+    return convertBitmask<int32_t, audio_gain_mode_t, AudioGainMode, audio_gain_mode_t>(
+            legacy, legacy2aidl_audio_gain_mode_t_AudioGainMode,
+            // AUDIO_GAIN_MODE_* constants are mask-based.
+            indexToEnum_bitmask<audio_gain_mode_t>,
+            // AudioGainMode is index-based.
+            enumToMask_index<int32_t, AudioGainMode>);
+}
+
+ConversionResult<audio_gain_config> aidl2legacy_AudioGainConfig_audio_gain_config(
+        const AudioGainConfig& aidl, bool isInput) {
+    audio_gain_config legacy;
+    legacy.index = VALUE_OR_RETURN(convertIntegral<int>(aidl.index));
+    legacy.mode = VALUE_OR_RETURN(aidl2legacy_int32_t_audio_gain_mode_t_mask(aidl.mode));
+    legacy.channel_mask = VALUE_OR_RETURN(
+            aidl2legacy_AudioChannelLayout_audio_channel_mask_t(aidl.channelMask, isInput));
+    const bool isJoint = bitmaskIsSet(aidl.mode, AudioGainMode::JOINT);
+    size_t numValues = isJoint ? 1
+                               : isInput ? audio_channel_count_from_in_mask(legacy.channel_mask)
+                                         : audio_channel_count_from_out_mask(legacy.channel_mask);
+    if (aidl.values.size() != numValues || aidl.values.size() > std::size(legacy.values)) {
+        return unexpected(BAD_VALUE);
+    }
+    for (size_t i = 0; i < numValues; ++i) {
+        legacy.values[i] = VALUE_OR_RETURN(convertIntegral<int>(aidl.values[i]));
+    }
+    legacy.ramp_duration_ms = VALUE_OR_RETURN(convertIntegral<unsigned int>(aidl.rampDurationMs));
+    return legacy;
+}
+
+ConversionResult<AudioGainConfig> legacy2aidl_audio_gain_config_AudioGainConfig(
+        const audio_gain_config& legacy, bool isInput) {
+    AudioGainConfig aidl;
+    aidl.index = VALUE_OR_RETURN(convertIntegral<int32_t>(legacy.index));
+    aidl.mode = VALUE_OR_RETURN(legacy2aidl_audio_gain_mode_t_int32_t_mask(legacy.mode));
+    aidl.channelMask = VALUE_OR_RETURN(
+            legacy2aidl_audio_channel_mask_t_AudioChannelLayout(legacy.channel_mask, isInput));
+    const bool isJoint = (legacy.mode & AUDIO_GAIN_MODE_JOINT) != 0;
+    size_t numValues = isJoint ? 1
+                               : isInput ? audio_channel_count_from_in_mask(legacy.channel_mask)
+                                         : audio_channel_count_from_out_mask(legacy.channel_mask);
+    aidl.values.resize(numValues);
+    for (size_t i = 0; i < numValues; ++i) {
+        aidl.values[i] = VALUE_OR_RETURN(convertIntegral<int32_t>(legacy.values[i]));
+    }
+    aidl.rampDurationMs = VALUE_OR_RETURN(convertIntegral<int32_t>(legacy.ramp_duration_ms));
+    return aidl;
+}
+
+ConversionResult<audio_input_flags_t> aidl2legacy_AudioInputFlags_audio_input_flags_t(
+        AudioInputFlags aidl) {
+    switch (aidl) {
+        case AudioInputFlags::FAST:
+            return AUDIO_INPUT_FLAG_FAST;
+        case AudioInputFlags::HW_HOTWORD:
+            return AUDIO_INPUT_FLAG_HW_HOTWORD;
+        case AudioInputFlags::RAW:
+            return AUDIO_INPUT_FLAG_RAW;
+        case AudioInputFlags::SYNC:
+            return AUDIO_INPUT_FLAG_SYNC;
+        case AudioInputFlags::MMAP_NOIRQ:
+            return AUDIO_INPUT_FLAG_MMAP_NOIRQ;
+        case AudioInputFlags::VOIP_TX:
+            return AUDIO_INPUT_FLAG_VOIP_TX;
+        case AudioInputFlags::HW_AV_SYNC:
+            return AUDIO_INPUT_FLAG_HW_AV_SYNC;
+        case AudioInputFlags::DIRECT:
+            return AUDIO_INPUT_FLAG_DIRECT;
+        case AudioInputFlags::ULTRASOUND:
+            return AUDIO_INPUT_FLAG_ULTRASOUND;
+    }
+    return unexpected(BAD_VALUE);
+}
+
+ConversionResult<AudioInputFlags> legacy2aidl_audio_input_flags_t_AudioInputFlags(
+        audio_input_flags_t legacy) {
+    switch (legacy) {
+        case AUDIO_INPUT_FLAG_NONE:
+            break; // shouldn't get here. must be listed  -Werror,-Wswitch
+        case AUDIO_INPUT_FLAG_FAST:
+            return AudioInputFlags::FAST;
+        case AUDIO_INPUT_FLAG_HW_HOTWORD:
+            return AudioInputFlags::HW_HOTWORD;
+        case AUDIO_INPUT_FLAG_RAW:
+            return AudioInputFlags::RAW;
+        case AUDIO_INPUT_FLAG_SYNC:
+            return AudioInputFlags::SYNC;
+        case AUDIO_INPUT_FLAG_MMAP_NOIRQ:
+            return AudioInputFlags::MMAP_NOIRQ;
+        case AUDIO_INPUT_FLAG_VOIP_TX:
+            return AudioInputFlags::VOIP_TX;
+        case AUDIO_INPUT_FLAG_HW_AV_SYNC:
+            return AudioInputFlags::HW_AV_SYNC;
+        case AUDIO_INPUT_FLAG_DIRECT:
+            return AudioInputFlags::DIRECT;
+        case AUDIO_INPUT_FLAG_ULTRASOUND:
+            return AudioInputFlags::ULTRASOUND;
+    }
+    return unexpected(BAD_VALUE);
+}
+
+ConversionResult<audio_output_flags_t> aidl2legacy_AudioOutputFlags_audio_output_flags_t(
+        AudioOutputFlags aidl) {
+    switch (aidl) {
+        case AudioOutputFlags::DIRECT:
+            return AUDIO_OUTPUT_FLAG_DIRECT;
+        case AudioOutputFlags::PRIMARY:
+            return AUDIO_OUTPUT_FLAG_PRIMARY;
+        case AudioOutputFlags::FAST:
+            return AUDIO_OUTPUT_FLAG_FAST;
+        case AudioOutputFlags::DEEP_BUFFER:
+            return AUDIO_OUTPUT_FLAG_DEEP_BUFFER;
+        case AudioOutputFlags::COMPRESS_OFFLOAD:
+            return AUDIO_OUTPUT_FLAG_COMPRESS_OFFLOAD;
+        case AudioOutputFlags::NON_BLOCKING:
+            return AUDIO_OUTPUT_FLAG_NON_BLOCKING;
+        case AudioOutputFlags::HW_AV_SYNC:
+            return AUDIO_OUTPUT_FLAG_HW_AV_SYNC;
+        case AudioOutputFlags::TTS:
+            return AUDIO_OUTPUT_FLAG_TTS;
+        case AudioOutputFlags::RAW:
+            return AUDIO_OUTPUT_FLAG_RAW;
+        case AudioOutputFlags::SYNC:
+            return AUDIO_OUTPUT_FLAG_SYNC;
+        case AudioOutputFlags::IEC958_NONAUDIO:
+            return AUDIO_OUTPUT_FLAG_IEC958_NONAUDIO;
+        case AudioOutputFlags::DIRECT_PCM:
+            return AUDIO_OUTPUT_FLAG_DIRECT_PCM;
+        case AudioOutputFlags::MMAP_NOIRQ:
+            return AUDIO_OUTPUT_FLAG_MMAP_NOIRQ;
+        case AudioOutputFlags::VOIP_RX:
+            return AUDIO_OUTPUT_FLAG_VOIP_RX;
+        case AudioOutputFlags::INCALL_MUSIC:
+            return AUDIO_OUTPUT_FLAG_INCALL_MUSIC;
+        case AudioOutputFlags::GAPLESS_OFFLOAD:
+            return AUDIO_OUTPUT_FLAG_GAPLESS_OFFLOAD;
+        case AudioOutputFlags::ULTRASOUND:
+            return AUDIO_OUTPUT_FLAG_ULTRASOUND;
+        case AudioOutputFlags::SPATIALIZER:
+            return AUDIO_OUTPUT_FLAG_SPATIALIZER;
+        case AudioOutputFlags::BIT_PERFECT:
+            return AUDIO_OUTPUT_FLAG_BIT_PERFECT;
+    }
+    return unexpected(BAD_VALUE);
+}
+
+ConversionResult<AudioOutputFlags> legacy2aidl_audio_output_flags_t_AudioOutputFlags(
+        audio_output_flags_t legacy) {
+    switch (legacy) {
+        case AUDIO_OUTPUT_FLAG_NONE:
+            break; // shouldn't get here. must be listed  -Werror,-Wswitch
+        case AUDIO_OUTPUT_FLAG_DIRECT:
+            return AudioOutputFlags::DIRECT;
+        case AUDIO_OUTPUT_FLAG_PRIMARY:
+            return AudioOutputFlags::PRIMARY;
+        case AUDIO_OUTPUT_FLAG_FAST:
+            return AudioOutputFlags::FAST;
+        case AUDIO_OUTPUT_FLAG_DEEP_BUFFER:
+            return AudioOutputFlags::DEEP_BUFFER;
+        case AUDIO_OUTPUT_FLAG_COMPRESS_OFFLOAD:
+            return AudioOutputFlags::COMPRESS_OFFLOAD;
+        case AUDIO_OUTPUT_FLAG_NON_BLOCKING:
+            return AudioOutputFlags::NON_BLOCKING;
+        case AUDIO_OUTPUT_FLAG_HW_AV_SYNC:
+            return AudioOutputFlags::HW_AV_SYNC;
+        case AUDIO_OUTPUT_FLAG_TTS:
+            return AudioOutputFlags::TTS;
+        case AUDIO_OUTPUT_FLAG_RAW:
+            return AudioOutputFlags::RAW;
+        case AUDIO_OUTPUT_FLAG_SYNC:
+            return AudioOutputFlags::SYNC;
+        case AUDIO_OUTPUT_FLAG_IEC958_NONAUDIO:
+            return AudioOutputFlags::IEC958_NONAUDIO;
+        case AUDIO_OUTPUT_FLAG_DIRECT_PCM:
+            return AudioOutputFlags::DIRECT_PCM;
+        case AUDIO_OUTPUT_FLAG_MMAP_NOIRQ:
+            return AudioOutputFlags::MMAP_NOIRQ;
+        case AUDIO_OUTPUT_FLAG_VOIP_RX:
+            return AudioOutputFlags::VOIP_RX;
+        case AUDIO_OUTPUT_FLAG_INCALL_MUSIC:
+            return AudioOutputFlags::INCALL_MUSIC;
+        case AUDIO_OUTPUT_FLAG_GAPLESS_OFFLOAD:
+            return AudioOutputFlags::GAPLESS_OFFLOAD;
+        case AUDIO_OUTPUT_FLAG_ULTRASOUND:
+            return AudioOutputFlags::ULTRASOUND;
+        case AUDIO_OUTPUT_FLAG_SPATIALIZER:
+            return AudioOutputFlags::SPATIALIZER;
+        case AUDIO_OUTPUT_FLAG_BIT_PERFECT:
+            return AudioOutputFlags::BIT_PERFECT;
+    }
+    return unexpected(BAD_VALUE);
+}
+
+ConversionResult<audio_input_flags_t> aidl2legacy_int32_t_audio_input_flags_t_mask(
+        int32_t aidl) {
+    using LegacyMask = std::underlying_type_t<audio_input_flags_t>;
+
+    LegacyMask converted = VALUE_OR_RETURN(
+            (convertBitmask<LegacyMask, int32_t, audio_input_flags_t, AudioInputFlags>(
+                    aidl, aidl2legacy_AudioInputFlags_audio_input_flags_t,
+                    indexToEnum_index<AudioInputFlags>,
+                    enumToMask_bitmask<LegacyMask, audio_input_flags_t>)));
+    return static_cast<audio_input_flags_t>(converted);
+}
+
+ConversionResult<int32_t> legacy2aidl_audio_input_flags_t_int32_t_mask(
+        audio_input_flags_t legacy) {
+    using LegacyMask = std::underlying_type_t<audio_input_flags_t>;
+
+    LegacyMask legacyMask = static_cast<LegacyMask>(legacy);
+    return convertBitmask<int32_t, LegacyMask, AudioInputFlags, audio_input_flags_t>(
+            legacyMask, legacy2aidl_audio_input_flags_t_AudioInputFlags,
+            indexToEnum_bitmask<audio_input_flags_t>,
+            enumToMask_index<int32_t, AudioInputFlags>);
+}
+
+ConversionResult<audio_output_flags_t> aidl2legacy_int32_t_audio_output_flags_t_mask(
+        int32_t aidl) {
+    return convertBitmask<audio_output_flags_t,
+            int32_t,
+            audio_output_flags_t,
+            AudioOutputFlags>(
+            aidl, aidl2legacy_AudioOutputFlags_audio_output_flags_t,
+            indexToEnum_index<AudioOutputFlags>,
+            enumToMask_bitmask<audio_output_flags_t, audio_output_flags_t>);
+}
+
+ConversionResult<int32_t> legacy2aidl_audio_output_flags_t_int32_t_mask(
+        audio_output_flags_t legacy) {
+    using LegacyMask = std::underlying_type_t<audio_output_flags_t>;
+
+    LegacyMask legacyMask = static_cast<LegacyMask>(legacy);
+    return convertBitmask<int32_t, LegacyMask, AudioOutputFlags, audio_output_flags_t>(
+            legacyMask, legacy2aidl_audio_output_flags_t_AudioOutputFlags,
+            indexToEnum_bitmask<audio_output_flags_t>,
+            enumToMask_index<int32_t, AudioOutputFlags>);
+}
+
+ConversionResult<audio_io_flags> aidl2legacy_AudioIoFlags_audio_io_flags(
+        const AudioIoFlags& aidl, bool isInput) {
+    audio_io_flags legacy;
+    if (isInput) {
+        legacy.input = VALUE_OR_RETURN(
+                aidl2legacy_int32_t_audio_input_flags_t_mask(
+                        VALUE_OR_RETURN(UNION_GET(aidl, input))));
+    } else {
+        legacy.output = VALUE_OR_RETURN(
+                aidl2legacy_int32_t_audio_output_flags_t_mask(
+                        VALUE_OR_RETURN(UNION_GET(aidl, output))));
+    }
+    return legacy;
+}
+
+ConversionResult<AudioIoFlags> legacy2aidl_audio_io_flags_AudioIoFlags(
+        const audio_io_flags& legacy, bool isInput) {
+    AudioIoFlags aidl;
+    if (isInput) {
+        UNION_SET(aidl, input,
+                VALUE_OR_RETURN(legacy2aidl_audio_input_flags_t_int32_t_mask(legacy.input)));
+    } else {
+        UNION_SET(aidl, output,
+                VALUE_OR_RETURN(legacy2aidl_audio_output_flags_t_int32_t_mask(legacy.output)));
+    }
+    return aidl;
+}
+
+ConversionResult<audio_stream_type_t> aidl2legacy_AudioStreamType_audio_stream_type_t(
+        AudioStreamType aidl) {
+    switch (aidl) {
+        case AudioStreamType::INVALID:
+            break;  // return error
+        case AudioStreamType::SYS_RESERVED_DEFAULT:
+            return AUDIO_STREAM_DEFAULT;
+        case AudioStreamType::VOICE_CALL:
+            return AUDIO_STREAM_VOICE_CALL;
+        case AudioStreamType::SYSTEM:
+            return AUDIO_STREAM_SYSTEM;
+        case AudioStreamType::RING:
+            return AUDIO_STREAM_RING;
+        case AudioStreamType::MUSIC:
+            return AUDIO_STREAM_MUSIC;
+        case AudioStreamType::ALARM:
+            return AUDIO_STREAM_ALARM;
+        case AudioStreamType::NOTIFICATION:
+            return AUDIO_STREAM_NOTIFICATION;
+        case AudioStreamType::BLUETOOTH_SCO:
+            return AUDIO_STREAM_BLUETOOTH_SCO;
+        case AudioStreamType::ENFORCED_AUDIBLE:
+            return AUDIO_STREAM_ENFORCED_AUDIBLE;
+        case AudioStreamType::DTMF:
+            return AUDIO_STREAM_DTMF;
+        case AudioStreamType::TTS:
+            return AUDIO_STREAM_TTS;
+        case AudioStreamType::ACCESSIBILITY:
+            return AUDIO_STREAM_ACCESSIBILITY;
+        case AudioStreamType::ASSISTANT:
+            return AUDIO_STREAM_ASSISTANT;
+        case AudioStreamType::SYS_RESERVED_REROUTING:
+            return AUDIO_STREAM_REROUTING;
+        case AudioStreamType::SYS_RESERVED_PATCH:
+            return AUDIO_STREAM_PATCH;
+        case AudioStreamType::CALL_ASSISTANT:
+            return AUDIO_STREAM_CALL_ASSISTANT;
+    }
+    return unexpected(BAD_VALUE);
+}
+
+ConversionResult<AudioStreamType> legacy2aidl_audio_stream_type_t_AudioStreamType(
+        audio_stream_type_t legacy) {
+    switch (legacy) {
+        case AUDIO_STREAM_DEFAULT:
+            return AudioStreamType::SYS_RESERVED_DEFAULT;
+        case AUDIO_STREAM_VOICE_CALL:
+            return AudioStreamType::VOICE_CALL;
+        case AUDIO_STREAM_SYSTEM:
+            return AudioStreamType::SYSTEM;
+        case AUDIO_STREAM_RING:
+            return AudioStreamType::RING;
+        case AUDIO_STREAM_MUSIC:
+            return AudioStreamType::MUSIC;
+        case AUDIO_STREAM_ALARM:
+            return AudioStreamType::ALARM;
+        case AUDIO_STREAM_NOTIFICATION:
+            return AudioStreamType::NOTIFICATION;
+        case AUDIO_STREAM_BLUETOOTH_SCO:
+            return AudioStreamType::BLUETOOTH_SCO;
+        case AUDIO_STREAM_ENFORCED_AUDIBLE:
+            return AudioStreamType::ENFORCED_AUDIBLE;
+        case AUDIO_STREAM_DTMF:
+            return AudioStreamType::DTMF;
+        case AUDIO_STREAM_TTS:
+            return AudioStreamType::TTS;
+        case AUDIO_STREAM_ACCESSIBILITY:
+            return AudioStreamType::ACCESSIBILITY;
+        case AUDIO_STREAM_ASSISTANT:
+            return AudioStreamType::ASSISTANT;
+        case AUDIO_STREAM_REROUTING:
+            return AudioStreamType::SYS_RESERVED_REROUTING;
+        case AUDIO_STREAM_PATCH:
+            return AudioStreamType::SYS_RESERVED_PATCH;
+        case AUDIO_STREAM_CALL_ASSISTANT:
+            return AudioStreamType::CALL_ASSISTANT;
+    }
+    return unexpected(BAD_VALUE);
+}
+
+ConversionResult<audio_source_t> aidl2legacy_AudioSource_audio_source_t(
+        AudioSource aidl) {
+    switch (aidl) {
+        case AudioSource::SYS_RESERVED_INVALID:
+            return AUDIO_SOURCE_INVALID;
+        case AudioSource::DEFAULT:
+            return AUDIO_SOURCE_DEFAULT;
+        case AudioSource::MIC:
+            return AUDIO_SOURCE_MIC;
+        case AudioSource::VOICE_UPLINK:
+            return AUDIO_SOURCE_VOICE_UPLINK;
+        case AudioSource::VOICE_DOWNLINK:
+            return AUDIO_SOURCE_VOICE_DOWNLINK;
+        case AudioSource::VOICE_CALL:
+            return AUDIO_SOURCE_VOICE_CALL;
+        case AudioSource::CAMCORDER:
+            return AUDIO_SOURCE_CAMCORDER;
+        case AudioSource::VOICE_RECOGNITION:
+            return AUDIO_SOURCE_VOICE_RECOGNITION;
+        case AudioSource::VOICE_COMMUNICATION:
+            return AUDIO_SOURCE_VOICE_COMMUNICATION;
+        case AudioSource::REMOTE_SUBMIX:
+            return AUDIO_SOURCE_REMOTE_SUBMIX;
+        case AudioSource::UNPROCESSED:
+            return AUDIO_SOURCE_UNPROCESSED;
+        case AudioSource::VOICE_PERFORMANCE:
+            return AUDIO_SOURCE_VOICE_PERFORMANCE;
+        case AudioSource::ULTRASOUND:
+            return AUDIO_SOURCE_ULTRASOUND;
+        case AudioSource::ECHO_REFERENCE:
+            return AUDIO_SOURCE_ECHO_REFERENCE;
+        case AudioSource::FM_TUNER:
+            return AUDIO_SOURCE_FM_TUNER;
+        case AudioSource::HOTWORD:
+            return AUDIO_SOURCE_HOTWORD;
+    }
+    return unexpected(BAD_VALUE);
+}
+
+ConversionResult<AudioSource> legacy2aidl_audio_source_t_AudioSource(
+        audio_source_t legacy) {
+    switch (legacy) {
+        case AUDIO_SOURCE_INVALID:
+            return AudioSource::SYS_RESERVED_INVALID;
+        case AUDIO_SOURCE_DEFAULT:
+            return AudioSource::DEFAULT;
+        case AUDIO_SOURCE_MIC:
+            return AudioSource::MIC;
+        case AUDIO_SOURCE_VOICE_UPLINK:
+            return AudioSource::VOICE_UPLINK;
+        case AUDIO_SOURCE_VOICE_DOWNLINK:
+            return AudioSource::VOICE_DOWNLINK;
+        case AUDIO_SOURCE_VOICE_CALL:
+            return AudioSource::VOICE_CALL;
+        case AUDIO_SOURCE_CAMCORDER:
+            return AudioSource::CAMCORDER;
+        case AUDIO_SOURCE_VOICE_RECOGNITION:
+            return AudioSource::VOICE_RECOGNITION;
+        case AUDIO_SOURCE_VOICE_COMMUNICATION:
+            return AudioSource::VOICE_COMMUNICATION;
+        case AUDIO_SOURCE_REMOTE_SUBMIX:
+            return AudioSource::REMOTE_SUBMIX;
+        case AUDIO_SOURCE_UNPROCESSED:
+            return AudioSource::UNPROCESSED;
+        case AUDIO_SOURCE_VOICE_PERFORMANCE:
+            return AudioSource::VOICE_PERFORMANCE;
+        case AUDIO_SOURCE_ULTRASOUND:
+            return AudioSource::ULTRASOUND;
+        case AUDIO_SOURCE_ECHO_REFERENCE:
+            return AudioSource::ECHO_REFERENCE;
+        case AUDIO_SOURCE_FM_TUNER:
+            return AudioSource::FM_TUNER;
+        case AUDIO_SOURCE_HOTWORD:
+            return AudioSource::HOTWORD;
+    }
+    return unexpected(BAD_VALUE);
+}
+
+ConversionResult<audio_session_t> aidl2legacy_int32_t_audio_session_t(int32_t aidl) {
+    return convertReinterpret<audio_session_t>(aidl);
+}
+
+ConversionResult<int32_t> legacy2aidl_audio_session_t_int32_t(audio_session_t legacy) {
+    return convertReinterpret<int32_t>(legacy);
+}
+
+ConversionResult<audio_content_type_t>
+aidl2legacy_AudioContentType_audio_content_type_t(AudioContentType aidl) {
+    switch (aidl) {
+        case AudioContentType::UNKNOWN:
+            return AUDIO_CONTENT_TYPE_UNKNOWN;
+        case AudioContentType::SPEECH:
+            return AUDIO_CONTENT_TYPE_SPEECH;
+        case AudioContentType::MUSIC:
+            return AUDIO_CONTENT_TYPE_MUSIC;
+        case AudioContentType::MOVIE:
+            return AUDIO_CONTENT_TYPE_MOVIE;
+        case AudioContentType::SONIFICATION:
+            return AUDIO_CONTENT_TYPE_SONIFICATION;
+        case AudioContentType::ULTRASOUND:
+            return AUDIO_CONTENT_TYPE_ULTRASOUND;
+    }
+    return unexpected(BAD_VALUE);
+}
+
+ConversionResult<AudioContentType>
+legacy2aidl_audio_content_type_t_AudioContentType(audio_content_type_t legacy) {
+    switch (legacy) {
+        case AUDIO_CONTENT_TYPE_UNKNOWN:
+            return AudioContentType::UNKNOWN;
+        case AUDIO_CONTENT_TYPE_SPEECH:
+            return AudioContentType::SPEECH;
+        case AUDIO_CONTENT_TYPE_MUSIC:
+            return AudioContentType::MUSIC;
+        case AUDIO_CONTENT_TYPE_MOVIE:
+            return AudioContentType::MOVIE;
+        case AUDIO_CONTENT_TYPE_SONIFICATION:
+            return AudioContentType::SONIFICATION;
+        case AUDIO_CONTENT_TYPE_ULTRASOUND:
+            return AudioContentType::ULTRASOUND;
+    }
+    return unexpected(BAD_VALUE);
+}
+
+ConversionResult<audio_usage_t>
+aidl2legacy_AudioUsage_audio_usage_t(AudioUsage aidl) {
+    switch (aidl) {
+        case AudioUsage::INVALID:
+            break;  // return error
+        case AudioUsage::UNKNOWN:
+            return AUDIO_USAGE_UNKNOWN;
+        case AudioUsage::MEDIA:
+            return AUDIO_USAGE_MEDIA;
+        case AudioUsage::VOICE_COMMUNICATION:
+            return AUDIO_USAGE_VOICE_COMMUNICATION;
+        case AudioUsage::VOICE_COMMUNICATION_SIGNALLING:
+            return AUDIO_USAGE_VOICE_COMMUNICATION_SIGNALLING;
+        case AudioUsage::ALARM:
+            return AUDIO_USAGE_ALARM;
+        case AudioUsage::NOTIFICATION:
+            return AUDIO_USAGE_NOTIFICATION;
+        case AudioUsage::NOTIFICATION_TELEPHONY_RINGTONE:
+            return AUDIO_USAGE_NOTIFICATION_TELEPHONY_RINGTONE;
+        case AudioUsage::SYS_RESERVED_NOTIFICATION_COMMUNICATION_REQUEST:
+            return AUDIO_USAGE_NOTIFICATION_COMMUNICATION_REQUEST;
+        case AudioUsage::SYS_RESERVED_NOTIFICATION_COMMUNICATION_INSTANT:
+            return AUDIO_USAGE_NOTIFICATION_COMMUNICATION_INSTANT;
+        case AudioUsage::SYS_RESERVED_NOTIFICATION_COMMUNICATION_DELAYED:
+            return AUDIO_USAGE_NOTIFICATION_COMMUNICATION_DELAYED;
+        case AudioUsage::NOTIFICATION_EVENT:
+            return AUDIO_USAGE_NOTIFICATION_EVENT;
+        case AudioUsage::ASSISTANCE_ACCESSIBILITY:
+            return AUDIO_USAGE_ASSISTANCE_ACCESSIBILITY;
+        case AudioUsage::ASSISTANCE_NAVIGATION_GUIDANCE:
+            return AUDIO_USAGE_ASSISTANCE_NAVIGATION_GUIDANCE;
+        case AudioUsage::ASSISTANCE_SONIFICATION:
+            return AUDIO_USAGE_ASSISTANCE_SONIFICATION;
+        case AudioUsage::GAME:
+            return AUDIO_USAGE_GAME;
+        case AudioUsage::VIRTUAL_SOURCE:
+            return AUDIO_USAGE_VIRTUAL_SOURCE;
+        case AudioUsage::ASSISTANT:
+            return AUDIO_USAGE_ASSISTANT;
+        case AudioUsage::CALL_ASSISTANT:
+            return AUDIO_USAGE_CALL_ASSISTANT;
+        case AudioUsage::EMERGENCY:
+            return AUDIO_USAGE_EMERGENCY;
+        case AudioUsage::SAFETY:
+            return AUDIO_USAGE_SAFETY;
+        case AudioUsage::VEHICLE_STATUS:
+            return AUDIO_USAGE_VEHICLE_STATUS;
+        case AudioUsage::ANNOUNCEMENT:
+            return AUDIO_USAGE_ANNOUNCEMENT;
+    }
+    return unexpected(BAD_VALUE);
+}
+
+ConversionResult<AudioUsage>
+legacy2aidl_audio_usage_t_AudioUsage(audio_usage_t legacy) {
+    switch (legacy) {
+        case AUDIO_USAGE_UNKNOWN:
+            return AudioUsage::UNKNOWN;
+        case AUDIO_USAGE_MEDIA:
+            return AudioUsage::MEDIA;
+        case AUDIO_USAGE_VOICE_COMMUNICATION:
+            return AudioUsage::VOICE_COMMUNICATION;
+        case AUDIO_USAGE_VOICE_COMMUNICATION_SIGNALLING:
+            return AudioUsage::VOICE_COMMUNICATION_SIGNALLING;
+        case AUDIO_USAGE_ALARM:
+            return AudioUsage::ALARM;
+        case AUDIO_USAGE_NOTIFICATION:
+            return AudioUsage::NOTIFICATION;
+        case AUDIO_USAGE_NOTIFICATION_TELEPHONY_RINGTONE:
+            return AudioUsage::NOTIFICATION_TELEPHONY_RINGTONE;
+        case AUDIO_USAGE_NOTIFICATION_COMMUNICATION_REQUEST:
+            return AudioUsage::SYS_RESERVED_NOTIFICATION_COMMUNICATION_REQUEST;
+        case AUDIO_USAGE_NOTIFICATION_COMMUNICATION_INSTANT:
+            return AudioUsage::SYS_RESERVED_NOTIFICATION_COMMUNICATION_INSTANT;
+        case AUDIO_USAGE_NOTIFICATION_COMMUNICATION_DELAYED:
+            return AudioUsage::SYS_RESERVED_NOTIFICATION_COMMUNICATION_DELAYED;
+        case AUDIO_USAGE_NOTIFICATION_EVENT:
+            return AudioUsage::NOTIFICATION_EVENT;
+        case AUDIO_USAGE_ASSISTANCE_ACCESSIBILITY:
+            return AudioUsage::ASSISTANCE_ACCESSIBILITY;
+        case AUDIO_USAGE_ASSISTANCE_NAVIGATION_GUIDANCE:
+            return AudioUsage::ASSISTANCE_NAVIGATION_GUIDANCE;
+        case AUDIO_USAGE_ASSISTANCE_SONIFICATION:
+            return AudioUsage::ASSISTANCE_SONIFICATION;
+        case AUDIO_USAGE_GAME:
+            return AudioUsage::GAME;
+        case AUDIO_USAGE_VIRTUAL_SOURCE:
+            return AudioUsage::VIRTUAL_SOURCE;
+        case AUDIO_USAGE_ASSISTANT:
+            return AudioUsage::ASSISTANT;
+        case AUDIO_USAGE_CALL_ASSISTANT:
+            return AudioUsage::CALL_ASSISTANT;
+        case AUDIO_USAGE_EMERGENCY:
+            return AudioUsage::EMERGENCY;
+        case AUDIO_USAGE_SAFETY:
+            return AudioUsage::SAFETY;
+        case AUDIO_USAGE_VEHICLE_STATUS:
+            return AudioUsage::VEHICLE_STATUS;
+        case AUDIO_USAGE_ANNOUNCEMENT:
+            return AudioUsage::ANNOUNCEMENT;
+    }
+    return unexpected(BAD_VALUE);
+}
+
+
+ConversionResult<audio_encapsulation_mode_t>
+aidl2legacy_AudioEncapsulationMode_audio_encapsulation_mode_t(AudioEncapsulationMode aidl) {
+    switch (aidl) {
+        case AudioEncapsulationMode::INVALID:
+            break;  // return error
+        case AudioEncapsulationMode::NONE:
+            return AUDIO_ENCAPSULATION_MODE_NONE;
+        case AudioEncapsulationMode::ELEMENTARY_STREAM:
+            return AUDIO_ENCAPSULATION_MODE_ELEMENTARY_STREAM;
+        case AudioEncapsulationMode::HANDLE:
+            return AUDIO_ENCAPSULATION_MODE_HANDLE;
+    }
+    return unexpected(BAD_VALUE);
+}
+
+ConversionResult<AudioEncapsulationMode>
+legacy2aidl_audio_encapsulation_mode_t_AudioEncapsulationMode(audio_encapsulation_mode_t legacy) {
+    switch (legacy) {
+        case AUDIO_ENCAPSULATION_MODE_NONE:
+            return AudioEncapsulationMode::NONE;
+        case AUDIO_ENCAPSULATION_MODE_ELEMENTARY_STREAM:
+            return AudioEncapsulationMode::ELEMENTARY_STREAM;
+        case AUDIO_ENCAPSULATION_MODE_HANDLE:
+            return AudioEncapsulationMode::HANDLE;
+    }
+    return unexpected(BAD_VALUE);
+}
+
+ConversionResult<audio_offload_info_t>
+aidl2legacy_AudioOffloadInfo_audio_offload_info_t(const AudioOffloadInfo& aidl) {
+    audio_offload_info_t legacy = AUDIO_INFO_INITIALIZER;
+    audio_config_base_t base = VALUE_OR_RETURN(
+            aidl2legacy_AudioConfigBase_audio_config_base_t(aidl.base, false /*isInput*/));
+    legacy.sample_rate = base.sample_rate;
+    legacy.channel_mask = base.channel_mask;
+    legacy.format = base.format;
+    legacy.stream_type = VALUE_OR_RETURN(
+            aidl2legacy_AudioStreamType_audio_stream_type_t(aidl.streamType));
+    legacy.bit_rate = VALUE_OR_RETURN(convertIntegral<uint32_t>(aidl.bitRatePerSecond));
+    legacy.duration_us = VALUE_OR_RETURN(convertIntegral<int64_t>(aidl.durationUs));
+    legacy.has_video = aidl.hasVideo;
+    legacy.is_streaming = aidl.isStreaming;
+    legacy.bit_width = VALUE_OR_RETURN(convertIntegral<uint32_t>(aidl.bitWidth));
+    legacy.offload_buffer_size = VALUE_OR_RETURN(convertIntegral<uint32_t>(aidl.offloadBufferSize));
+    legacy.usage = VALUE_OR_RETURN(aidl2legacy_AudioUsage_audio_usage_t(aidl.usage));
+    legacy.encapsulation_mode = VALUE_OR_RETURN(
+            aidl2legacy_AudioEncapsulationMode_audio_encapsulation_mode_t(aidl.encapsulationMode));
+    legacy.content_id = VALUE_OR_RETURN(convertReinterpret<int32_t>(aidl.contentId));
+    legacy.sync_id = VALUE_OR_RETURN(convertReinterpret<int32_t>(aidl.syncId));
+    return legacy;
+}
+
+ConversionResult<AudioOffloadInfo>
+legacy2aidl_audio_offload_info_t_AudioOffloadInfo(const audio_offload_info_t& legacy) {
+    AudioOffloadInfo aidl;
+    // Version 0.1 fields.
+    if (legacy.size < offsetof(audio_offload_info_t, usage) + sizeof(audio_offload_info_t::usage)) {
+        return unexpected(BAD_VALUE);
+    }
+    const audio_config_base_t base = { .sample_rate = legacy.sample_rate,
+        .channel_mask = legacy.channel_mask, .format = legacy.format };
+    aidl.base = VALUE_OR_RETURN(legacy2aidl_audio_config_base_t_AudioConfigBase(
+                    base, false /*isInput*/));
+    aidl.streamType = VALUE_OR_RETURN(
+            legacy2aidl_audio_stream_type_t_AudioStreamType(legacy.stream_type));
+    aidl.bitRatePerSecond = VALUE_OR_RETURN(convertIntegral<int32_t>(legacy.bit_rate));
+    aidl.durationUs = VALUE_OR_RETURN(convertIntegral<int64_t>(legacy.duration_us));
+    aidl.hasVideo = legacy.has_video;
+    aidl.isStreaming = legacy.is_streaming;
+    aidl.bitWidth = VALUE_OR_RETURN(convertIntegral<int32_t>(legacy.bit_width));
+    aidl.offloadBufferSize = VALUE_OR_RETURN(convertIntegral<int32_t>(legacy.offload_buffer_size));
+    aidl.usage = VALUE_OR_RETURN(legacy2aidl_audio_usage_t_AudioUsage(legacy.usage));
+
+    // Version 0.2 fields.
+    if (legacy.version >= AUDIO_OFFLOAD_INFO_VERSION_0_2) {
+        if (legacy.size <
+            offsetof(audio_offload_info_t, sync_id) + sizeof(audio_offload_info_t::sync_id)) {
+            return unexpected(BAD_VALUE);
+        }
+        aidl.encapsulationMode = VALUE_OR_RETURN(
+                legacy2aidl_audio_encapsulation_mode_t_AudioEncapsulationMode(
+                        legacy.encapsulation_mode));
+        aidl.contentId = VALUE_OR_RETURN(convertReinterpret<int32_t>(legacy.content_id));
+        aidl.syncId = VALUE_OR_RETURN(convertReinterpret<int32_t>(legacy.sync_id));
+    }
+    return aidl;
+}
+
+ConversionResult<audio_config_t>
+aidl2legacy_AudioConfig_audio_config_t(const AudioConfig& aidl, bool isInput) {
+    const audio_config_base_t legacyBase = VALUE_OR_RETURN(
+            aidl2legacy_AudioConfigBase_audio_config_base_t(aidl.base, isInput));
+    audio_config_t legacy = AUDIO_CONFIG_INITIALIZER;
+    legacy.sample_rate = legacyBase.sample_rate;
+    legacy.channel_mask = legacyBase.channel_mask;
+    legacy.format = legacyBase.format;
+    legacy.offload_info = VALUE_OR_RETURN(
+            aidl2legacy_AudioOffloadInfo_audio_offload_info_t(aidl.offloadInfo));
+    legacy.frame_count = VALUE_OR_RETURN(convertIntegral<uint32_t>(aidl.frameCount));
+    return legacy;
+}
+
+ConversionResult<AudioConfig>
+legacy2aidl_audio_config_t_AudioConfig(const audio_config_t& legacy, bool isInput) {
+    const audio_config_base_t base = { .sample_rate = legacy.sample_rate,
+        .channel_mask = legacy.channel_mask, .format = legacy.format };
+    AudioConfig aidl;
+    aidl.base = VALUE_OR_RETURN(legacy2aidl_audio_config_base_t_AudioConfigBase(base, isInput));
+    aidl.offloadInfo = VALUE_OR_RETURN(
+            legacy2aidl_audio_offload_info_t_AudioOffloadInfo(legacy.offload_info));
+    aidl.frameCount = VALUE_OR_RETURN(convertIntegral<int64_t>(legacy.frame_count));
+    return aidl;
+}
+
+ConversionResult<audio_config_base_t>
+aidl2legacy_AudioConfigBase_audio_config_base_t(const AudioConfigBase& aidl, bool isInput) {
+    audio_config_base_t legacy;
+    legacy.sample_rate = VALUE_OR_RETURN(convertIntegral<uint32_t>(aidl.sampleRate));
+    legacy.channel_mask = VALUE_OR_RETURN(
+            aidl2legacy_AudioChannelLayout_audio_channel_mask_t(aidl.channelMask, isInput));
+    legacy.format = VALUE_OR_RETURN(aidl2legacy_AudioFormatDescription_audio_format_t(aidl.format));
+    return legacy;
+}
+
+ConversionResult<AudioConfigBase>
+legacy2aidl_audio_config_base_t_AudioConfigBase(const audio_config_base_t& legacy, bool isInput) {
+    AudioConfigBase aidl;
+    aidl.sampleRate = VALUE_OR_RETURN(convertIntegral<int32_t>(legacy.sample_rate));
+    aidl.channelMask = VALUE_OR_RETURN(
+            legacy2aidl_audio_channel_mask_t_AudioChannelLayout(legacy.channel_mask, isInput));
+    aidl.format = VALUE_OR_RETURN(legacy2aidl_audio_format_t_AudioFormatDescription(legacy.format));
+    return aidl;
+}
+
+ConversionResult<audio_uuid_t>
+aidl2legacy_AudioUuid_audio_uuid_t(const AudioUuid& aidl) {
+    audio_uuid_t legacy;
+    legacy.timeLow = VALUE_OR_RETURN(convertReinterpret<uint32_t>(aidl.timeLow));
+    legacy.timeMid = VALUE_OR_RETURN(convertIntegral<uint16_t>(aidl.timeMid));
+    legacy.timeHiAndVersion = VALUE_OR_RETURN(convertIntegral<uint16_t>(aidl.timeHiAndVersion));
+    legacy.clockSeq = VALUE_OR_RETURN(convertIntegral<uint16_t>(aidl.clockSeq));
+    if (aidl.node.size() != std::size(legacy.node)) {
+        return unexpected(BAD_VALUE);
+    }
+    std::copy(aidl.node.begin(), aidl.node.end(), legacy.node);
+    return legacy;
+}
+
+ConversionResult<AudioUuid>
+legacy2aidl_audio_uuid_t_AudioUuid(const audio_uuid_t& legacy) {
+    AudioUuid aidl;
+    aidl.timeLow = VALUE_OR_RETURN(convertReinterpret<int32_t>(legacy.timeLow));
+    aidl.timeMid = VALUE_OR_RETURN(convertIntegral<int32_t>(legacy.timeMid));
+    aidl.timeHiAndVersion = VALUE_OR_RETURN(convertIntegral<int32_t>(legacy.timeHiAndVersion));
+    aidl.clockSeq = VALUE_OR_RETURN(convertIntegral<int32_t>(legacy.clockSeq));
+    std::copy(legacy.node, legacy.node + std::size(legacy.node), std::back_inserter(aidl.node));
+    return aidl;
+}
+
+ConversionResult<audio_encapsulation_metadata_type_t>
+aidl2legacy_AudioEncapsulationMetadataType_audio_encapsulation_metadata_type_t(
+        AudioEncapsulationMetadataType aidl) {
+    switch (aidl) {
+        case AudioEncapsulationMetadataType::NONE:
+            return AUDIO_ENCAPSULATION_METADATA_TYPE_NONE;
+        case AudioEncapsulationMetadataType::FRAMEWORK_TUNER:
+            return AUDIO_ENCAPSULATION_METADATA_TYPE_FRAMEWORK_TUNER;
+        case AudioEncapsulationMetadataType::DVB_AD_DESCRIPTOR:
+            return AUDIO_ENCAPSULATION_METADATA_TYPE_DVB_AD_DESCRIPTOR;
+    }
+    return unexpected(BAD_VALUE);
+}
+
+ConversionResult<AudioEncapsulationMetadataType>
+legacy2aidl_audio_encapsulation_metadata_type_t_AudioEncapsulationMetadataType(
+        audio_encapsulation_metadata_type_t legacy) {
+    switch (legacy) {
+        case AUDIO_ENCAPSULATION_METADATA_TYPE_NONE:
+            return AudioEncapsulationMetadataType::NONE;
+        case AUDIO_ENCAPSULATION_METADATA_TYPE_FRAMEWORK_TUNER:
+            return AudioEncapsulationMetadataType::FRAMEWORK_TUNER;
+        case AUDIO_ENCAPSULATION_METADATA_TYPE_DVB_AD_DESCRIPTOR:
+            return AudioEncapsulationMetadataType::DVB_AD_DESCRIPTOR;
+    }
+    return unexpected(BAD_VALUE);
+}
+
+ConversionResult<uint32_t>
+aidl2legacy_AudioEncapsulationMode_mask(int32_t aidl) {
+    return convertBitmask<uint32_t,
+            int32_t,
+            audio_encapsulation_mode_t,
+            AudioEncapsulationMode>(
+            aidl, aidl2legacy_AudioEncapsulationMode_audio_encapsulation_mode_t,
+            indexToEnum_index<AudioEncapsulationMode>,
+            enumToMask_index<uint32_t, audio_encapsulation_mode_t>);
+}
+
+ConversionResult<int32_t>
+legacy2aidl_AudioEncapsulationMode_mask(uint32_t legacy) {
+    return convertBitmask<int32_t,
+            uint32_t,
+            AudioEncapsulationMode,
+            audio_encapsulation_mode_t>(
+            legacy, legacy2aidl_audio_encapsulation_mode_t_AudioEncapsulationMode,
+            indexToEnum_index<audio_encapsulation_mode_t>,
+            enumToMask_index<int32_t, AudioEncapsulationMode>);
+}
+
+ConversionResult<uint32_t>
+aidl2legacy_AudioEncapsulationMetadataType_mask(int32_t aidl) {
+    return convertBitmask<uint32_t,
+            int32_t,
+            audio_encapsulation_metadata_type_t,
+            AudioEncapsulationMetadataType>(
+            aidl, aidl2legacy_AudioEncapsulationMetadataType_audio_encapsulation_metadata_type_t,
+            indexToEnum_index<AudioEncapsulationMetadataType>,
+            enumToMask_index<uint32_t, audio_encapsulation_metadata_type_t>);
+}
+
+ConversionResult<int32_t>
+legacy2aidl_AudioEncapsulationMetadataType_mask(uint32_t legacy) {
+    return convertBitmask<int32_t,
+            uint32_t,
+            AudioEncapsulationMetadataType,
+            audio_encapsulation_metadata_type_t>(
+            legacy, legacy2aidl_audio_encapsulation_metadata_type_t_AudioEncapsulationMetadataType,
+            indexToEnum_index<audio_encapsulation_metadata_type_t>,
+            enumToMask_index<int32_t, AudioEncapsulationMetadataType>);
+}
+
+ConversionResult<audio_profile>
+aidl2legacy_AudioProfile_audio_profile(const AudioProfile& aidl, bool isInput) {
+    audio_profile legacy;
+    legacy.format = VALUE_OR_RETURN(aidl2legacy_AudioFormatDescription_audio_format_t(aidl.format));
+
+    if (aidl.sampleRates.size() > std::size(legacy.sample_rates)) {
+        return unexpected(BAD_VALUE);
+    }
+    RETURN_IF_ERROR(
+            convertRange(aidl.sampleRates.begin(), aidl.sampleRates.end(), legacy.sample_rates,
+                         convertIntegral<int32_t, unsigned int>));
+    legacy.num_sample_rates = aidl.sampleRates.size();
+
+    if (aidl.channelMasks.size() > std::size(legacy.channel_masks)) {
+        return unexpected(BAD_VALUE);
+    }
+    RETURN_IF_ERROR(
+            convertRange(aidl.channelMasks.begin(), aidl.channelMasks.end(), legacy.channel_masks,
+                    [isInput](const AudioChannelLayout& l) {
+                        return aidl2legacy_AudioChannelLayout_audio_channel_mask_t(l, isInput);
+                    }));
+    legacy.num_channel_masks = aidl.channelMasks.size();
+
+    legacy.encapsulation_type = VALUE_OR_RETURN(
+            aidl2legacy_AudioEncapsulationType_audio_encapsulation_type_t(aidl.encapsulationType));
+    return legacy;
+}
+
+ConversionResult<AudioProfile>
+legacy2aidl_audio_profile_AudioProfile(const audio_profile& legacy, bool isInput) {
+    AudioProfile aidl;
+    aidl.format = VALUE_OR_RETURN(legacy2aidl_audio_format_t_AudioFormatDescription(legacy.format));
+
+    if (legacy.num_sample_rates > std::size(legacy.sample_rates)) {
+        return unexpected(BAD_VALUE);
+    }
+    RETURN_IF_ERROR(
+            convertRange(legacy.sample_rates, legacy.sample_rates + legacy.num_sample_rates,
+                         std::back_inserter(aidl.sampleRates),
+                         convertIntegral<unsigned int, int32_t>));
+
+    if (legacy.num_channel_masks > std::size(legacy.channel_masks)) {
+        return unexpected(BAD_VALUE);
+    }
+    RETURN_IF_ERROR(
+            convertRange(legacy.channel_masks, legacy.channel_masks + legacy.num_channel_masks,
+                         std::back_inserter(aidl.channelMasks),
+                    [isInput](audio_channel_mask_t m) {
+                        return legacy2aidl_audio_channel_mask_t_AudioChannelLayout(m, isInput);
+                    }));
+
+    aidl.encapsulationType = VALUE_OR_RETURN(
+            legacy2aidl_audio_encapsulation_type_t_AudioEncapsulationType(
+                    legacy.encapsulation_type));
+    return aidl;
+}
+
+ConversionResult<audio_gain>
+aidl2legacy_AudioGain_audio_gain(const AudioGain& aidl, bool isInput) {
+    audio_gain legacy;
+    legacy.mode = VALUE_OR_RETURN(aidl2legacy_int32_t_audio_gain_mode_t_mask(aidl.mode));
+    legacy.channel_mask = VALUE_OR_RETURN(aidl2legacy_AudioChannelLayout_audio_channel_mask_t(
+                    aidl.channelMask, isInput));
+    legacy.min_value = VALUE_OR_RETURN(convertIntegral<int>(aidl.minValue));
+    legacy.max_value = VALUE_OR_RETURN(convertIntegral<int>(aidl.maxValue));
+    legacy.default_value = VALUE_OR_RETURN(convertIntegral<int>(aidl.defaultValue));
+    legacy.step_value = VALUE_OR_RETURN(convertIntegral<unsigned int>(aidl.stepValue));
+    legacy.min_ramp_ms = VALUE_OR_RETURN(convertIntegral<unsigned int>(aidl.minRampMs));
+    legacy.max_ramp_ms = VALUE_OR_RETURN(convertIntegral<unsigned int>(aidl.maxRampMs));
+    return legacy;
+}
+
+ConversionResult<AudioGain>
+legacy2aidl_audio_gain_AudioGain(const audio_gain& legacy, bool isInput) {
+    AudioGain aidl;
+    aidl.mode = VALUE_OR_RETURN(legacy2aidl_audio_gain_mode_t_int32_t_mask(legacy.mode));
+    aidl.channelMask = VALUE_OR_RETURN(
+            legacy2aidl_audio_channel_mask_t_AudioChannelLayout(legacy.channel_mask, isInput));
+    aidl.minValue = VALUE_OR_RETURN(convertIntegral<int32_t>(legacy.min_value));
+    aidl.maxValue = VALUE_OR_RETURN(convertIntegral<int32_t>(legacy.max_value));
+    aidl.defaultValue = VALUE_OR_RETURN(convertIntegral<int32_t>(legacy.default_value));
+    aidl.stepValue = VALUE_OR_RETURN(convertIntegral<int32_t>(legacy.step_value));
+    aidl.minRampMs = VALUE_OR_RETURN(convertIntegral<int32_t>(legacy.min_ramp_ms));
+    aidl.maxRampMs = VALUE_OR_RETURN(convertIntegral<int32_t>(legacy.max_ramp_ms));
+    return aidl;
+}
+
+ConversionResult<audio_mode_t>
+aidl2legacy_AudioMode_audio_mode_t(AudioMode aidl) {
+    switch (aidl) {
+        case AudioMode::SYS_RESERVED_INVALID:
+            return AUDIO_MODE_INVALID;
+        case AudioMode::SYS_RESERVED_CURRENT:
+            return AUDIO_MODE_CURRENT;
+        case AudioMode::NORMAL:
+            return AUDIO_MODE_NORMAL;
+        case AudioMode::RINGTONE:
+            return AUDIO_MODE_RINGTONE;
+        case AudioMode::IN_CALL:
+            return AUDIO_MODE_IN_CALL;
+        case AudioMode::IN_COMMUNICATION:
+            return AUDIO_MODE_IN_COMMUNICATION;
+        case AudioMode::CALL_SCREEN:
+            return AUDIO_MODE_CALL_SCREEN;
+        case AudioMode::SYS_RESERVED_CALL_REDIRECT:
+            return AUDIO_MODE_CALL_REDIRECT;
+        case AudioMode::SYS_RESERVED_COMMUNICATION_REDIRECT:
+            return AUDIO_MODE_COMMUNICATION_REDIRECT;
+    }
+    return unexpected(BAD_VALUE);
+}
+
+ConversionResult<AudioMode>
+legacy2aidl_audio_mode_t_AudioMode(audio_mode_t legacy) {
+    switch (legacy) {
+        case AUDIO_MODE_INVALID:
+            return AudioMode::SYS_RESERVED_INVALID;
+        case AUDIO_MODE_CURRENT:
+            return AudioMode::SYS_RESERVED_CURRENT;
+        case AUDIO_MODE_NORMAL:
+            return AudioMode::NORMAL;
+        case AUDIO_MODE_RINGTONE:
+            return AudioMode::RINGTONE;
+        case AUDIO_MODE_IN_CALL:
+            return AudioMode::IN_CALL;
+        case AUDIO_MODE_IN_COMMUNICATION:
+            return AudioMode::IN_COMMUNICATION;
+        case AUDIO_MODE_CALL_SCREEN:
+            return AudioMode::CALL_SCREEN;
+        case AUDIO_MODE_CALL_REDIRECT:
+            return AudioMode::SYS_RESERVED_CALL_REDIRECT;
+        case AUDIO_MODE_COMMUNICATION_REDIRECT:
+            return AudioMode::SYS_RESERVED_COMMUNICATION_REDIRECT;
+        case AUDIO_MODE_CNT:
+            break;
+    }
+    return unexpected(BAD_VALUE);
+}
+
+ConversionResult<audio_standard_t>
+aidl2legacy_AudioStandard_audio_standard_t(AudioStandard aidl) {
+    switch (aidl) {
+        case AudioStandard::NONE:
+            return AUDIO_STANDARD_NONE;
+        case AudioStandard::EDID:
+            return AUDIO_STANDARD_EDID;
+    }
+    return unexpected(BAD_VALUE);
+}
+
+ConversionResult<AudioStandard>
+legacy2aidl_audio_standard_t_AudioStandard(audio_standard_t legacy) {
+    switch (legacy) {
+        case AUDIO_STANDARD_NONE:
+            return AudioStandard::NONE;
+        case AUDIO_STANDARD_EDID:
+            return AudioStandard::EDID;
+    }
+    return unexpected(BAD_VALUE);
+}
+
+ConversionResult<audio_extra_audio_descriptor>
+aidl2legacy_ExtraAudioDescriptor_audio_extra_audio_descriptor(
+        const ExtraAudioDescriptor& aidl) {
+    audio_extra_audio_descriptor legacy;
+    legacy.standard = VALUE_OR_RETURN(aidl2legacy_AudioStandard_audio_standard_t(aidl.standard));
+    if (aidl.audioDescriptor.size() > EXTRA_AUDIO_DESCRIPTOR_SIZE) {
+        return unexpected(BAD_VALUE);
+    }
+    legacy.descriptor_length = aidl.audioDescriptor.size();
+    std::copy(aidl.audioDescriptor.begin(), aidl.audioDescriptor.end(),
+              std::begin(legacy.descriptor));
+    legacy.encapsulation_type =
+            VALUE_OR_RETURN(aidl2legacy_AudioEncapsulationType_audio_encapsulation_type_t(
+                    aidl.encapsulationType));
+    return legacy;
+}
+
+ConversionResult<ExtraAudioDescriptor>
+legacy2aidl_audio_extra_audio_descriptor_ExtraAudioDescriptor(
+        const audio_extra_audio_descriptor& legacy) {
+    ExtraAudioDescriptor aidl;
+    aidl.standard = VALUE_OR_RETURN(legacy2aidl_audio_standard_t_AudioStandard(legacy.standard));
+    if (legacy.descriptor_length > EXTRA_AUDIO_DESCRIPTOR_SIZE) {
+        return unexpected(BAD_VALUE);
+    }
+    aidl.audioDescriptor.resize(legacy.descriptor_length);
+    std::copy(legacy.descriptor, legacy.descriptor + legacy.descriptor_length,
+              aidl.audioDescriptor.begin());
+    aidl.encapsulationType =
+            VALUE_OR_RETURN(legacy2aidl_audio_encapsulation_type_t_AudioEncapsulationType(
+                    legacy.encapsulation_type));
+    return aidl;
+}
+
+ConversionResult<audio_encapsulation_type_t>
+aidl2legacy_AudioEncapsulationType_audio_encapsulation_type_t(
+        const AudioEncapsulationType& aidl) {
+    switch (aidl) {
+        case AudioEncapsulationType::NONE:
+            return AUDIO_ENCAPSULATION_TYPE_NONE;
+        case AudioEncapsulationType::IEC61937:
+            return AUDIO_ENCAPSULATION_TYPE_IEC61937;
+        case AudioEncapsulationType::PCM:
+            return AUDIO_ENCAPSULATION_TYPE_PCM;
+    }
+    return unexpected(BAD_VALUE);
+}
+
+ConversionResult<AudioEncapsulationType>
+legacy2aidl_audio_encapsulation_type_t_AudioEncapsulationType(
+        const audio_encapsulation_type_t & legacy) {
+    switch (legacy) {
+        case AUDIO_ENCAPSULATION_TYPE_NONE:
+            return AudioEncapsulationType::NONE;
+        case AUDIO_ENCAPSULATION_TYPE_IEC61937:
+            return AudioEncapsulationType::IEC61937;
+        case AUDIO_ENCAPSULATION_TYPE_PCM:
+            return AudioEncapsulationType::PCM;
+    }
+    return unexpected(BAD_VALUE);
+}
+
+}  // namespace android
+
+#if defined(BACKEND_NDK)
+}  // aidl
+#endif
\ No newline at end of file