media/audioaidlconversion/AidlConversionCppNdk.cpp

/*
 * 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 <stdio.h>

#include <algorithm>
#include <map>
#include <sstream>
#include <utility>
#include <vector>

#define LOG_TAG "AidlConversionCppNdk"
//#define LOG_NDEBUG 0
#include <utils/Log.h>

#include "media/AidlConversionCppNdk.h"

#include <media/stagefright/foundation/MediaDefs.h>

////////////////////////////////////////////////////////////////////////////////////////////////////
// AIDL CPP/NDK backend to legacy audio data structure conversion 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::String16;
using ::android::String8;
using ::android::status_t;
using ::android::base::unexpected;

using media::audio::common::AudioAttributes;
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::AudioDualMonoMode;
using media::audio::common::AudioEncapsulationMetadataType;
using media::audio::common::AudioEncapsulationMode;
using media::audio::common::AudioEncapsulationType;
using media::audio::common::AudioFlag;
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::AudioLatencyMode;
using media::audio::common::AudioMode;
using media::audio::common::AudioOffloadInfo;
using media::audio::common::AudioOutputFlags;
using media::audio::common::AudioPlaybackRate;
using media::audio::common::AudioPort;
using media::audio::common::AudioPortConfig;
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::MicrophoneDynamicInfo;
using media::audio::common::MicrophoneInfo;
using media::audio::common::PcmType;

////////////////////////////////////////////////////////////////////////////////////////////////////
// Converters

namespace {

std::vector<std::string> splitString(const std::string& s, char separator) {
    std::istringstream iss(s);
    std::string t;
    std::vector<std::string> result;
    while (std::getline(iss, t, separator)) {
        result.push_back(std::move(t));
    }
    return result;
}

}  // namespace

::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(2POINT1),
        DEFINE_INPUT_LAYOUT(FRONT_BACK),
        DEFINE_INPUT_LAYOUT(TRI),
        DEFINE_INPUT_LAYOUT(3POINT1),
        // 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(QUAD),
        DEFINE_INPUT_LAYOUT(PENTA),
        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_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_BUS, AudioDeviceType::OUT_BUS);
        append_AudioDeviceDescription(pairs,
                AUDIO_DEVICE_IN_PROXY, AUDIO_DEVICE_OUT_PROXY,
                AudioDeviceType::IN_AFE_PROXY, AudioDeviceType::OUT_AFE_PROXY,
                GET_DEVICE_DESC_CONNECTION(VIRTUAL));
        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));
        append_AudioDeviceDescription(pairs,
                AUDIO_DEVICE_IN_REMOTE_SUBMIX, AUDIO_DEVICE_OUT_REMOTE_SUBMIX,
                AudioDeviceType::IN_SUBMIX, AudioDeviceType::OUT_SUBMIX,
                GET_DEVICE_DESC_CONNECTION(VIRTUAL));

        return pairs;
    }();
    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) <= (int)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__, static_cast<int>(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);
    }
}

AudioDeviceAddress::Tag suggestDeviceAddressTag(const AudioDeviceDescription& description) {
    using Tag = AudioDeviceAddress::Tag;
    if (std::string connection = description.connection;
            connection == GET_DEVICE_DESC_CONNECTION(BT_A2DP) ||
            // Note: BT LE Broadcast uses a "group id".
            (description.type != AudioDeviceType::OUT_BROADCAST &&
                    connection == GET_DEVICE_DESC_CONNECTION(BT_LE)) ||
            connection == GET_DEVICE_DESC_CONNECTION(BT_SCO) ||
            connection == GET_DEVICE_DESC_CONNECTION(WIRELESS)) {
        return Tag::mac;
    } else if (connection == GET_DEVICE_DESC_CONNECTION(IP_V4)) {
        return Tag::ipv4;
    } else if (connection == GET_DEVICE_DESC_CONNECTION(USB)) {
        return Tag::alsa;
    }
    return Tag::id;
}

::android::status_t aidl2legacy_AudioDevice_audio_device(
        const AudioDevice& aidl,
        audio_devices_t* legacyType, char* legacyAddress) {
    std::string stringAddress;
    RETURN_STATUS_IF_ERROR(aidl2legacy_AudioDevice_audio_device(
                    aidl, legacyType, &stringAddress));
    return aidl2legacy_string(stringAddress, legacyAddress, AUDIO_DEVICE_MAX_ADDRESS_LEN);
}

::android::status_t aidl2legacy_AudioDevice_audio_device(
        const AudioDevice& aidl,
        audio_devices_t* legacyType, String8* legacyAddress) {
    std::string stringAddress;
    RETURN_STATUS_IF_ERROR(aidl2legacy_AudioDevice_audio_device(
                    aidl, legacyType, &stringAddress));
    *legacyAddress = VALUE_OR_RETURN_STATUS(aidl2legacy_string_view_String8(stringAddress));
    return OK;
}

::android::status_t aidl2legacy_AudioDevice_audio_device(
        const AudioDevice& aidl,
        audio_devices_t* legacyType, std::string* legacyAddress) {
    using Tag = AudioDeviceAddress::Tag;
    *legacyType = VALUE_OR_RETURN_STATUS(
            aidl2legacy_AudioDeviceDescription_audio_devices_t(aidl.type));
    char addressBuffer[AUDIO_DEVICE_MAX_ADDRESS_LEN]{};
    // 'aidl.address' can be empty even when the connection type is not.
    // This happens for device ports that act as "blueprints". In this case
    // we pass an empty string using the 'id' variant.
    switch (aidl.address.getTag()) {
        case Tag::mac: {
            const std::vector<uint8_t>& mac = aidl.address.get<AudioDeviceAddress::mac>();
            if (mac.size() != 6) return BAD_VALUE;
            snprintf(addressBuffer, AUDIO_DEVICE_MAX_ADDRESS_LEN, "%02X:%02X:%02X:%02X:%02X:%02X",
                    mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
            // special case for anonymized mac address:
            // change anonymized bytes back from FD:FF:FF:FF to XX:XX:XX:XX
            std::string address(addressBuffer);
            if (address.compare(0, strlen("FD:FF:FF:FF"), "FD:FF:FF:FF") == 0) {
                address.replace(0, strlen("FD:FF:FF:FF"), "XX:XX:XX:XX");
            }
            strcpy(addressBuffer, address.c_str());
        } break;
        case Tag::ipv4: {
            const std::vector<uint8_t>& ipv4 = aidl.address.get<AudioDeviceAddress::ipv4>();
            if (ipv4.size() != 4) return BAD_VALUE;
            snprintf(addressBuffer, AUDIO_DEVICE_MAX_ADDRESS_LEN, "%u.%u.%u.%u",
                    ipv4[0], ipv4[1], ipv4[2], ipv4[3]);
        } break;
        case Tag::ipv6: {
            const std::vector<int32_t>& ipv6 = aidl.address.get<AudioDeviceAddress::ipv6>();
            if (ipv6.size() != 8) return BAD_VALUE;
// FIXME: Code warning found by clang-r510928
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wfortify-source"
            snprintf(addressBuffer, AUDIO_DEVICE_MAX_ADDRESS_LEN,
                    "%04X:%04X:%04X:%04X:%04X:%04X:%04X:%04X",
                    ipv6[0], ipv6[1], ipv6[2], ipv6[3], ipv6[4], ipv6[5], ipv6[6], ipv6[7]);
#pragma clang diagnostic pop
        } break;
        case Tag::alsa: {
            const std::vector<int32_t>& alsa = aidl.address.get<AudioDeviceAddress::alsa>();
            if (alsa.size() != 2) return BAD_VALUE;
            snprintf(addressBuffer, AUDIO_DEVICE_MAX_ADDRESS_LEN, "card=%d;device=%d",
                    alsa[0], alsa[1]);
        } break;
        case Tag::id: {
            RETURN_STATUS_IF_ERROR(aidl2legacy_string(aidl.address.get<AudioDeviceAddress::id>(),
                            addressBuffer, AUDIO_DEVICE_MAX_ADDRESS_LEN));
        } break;
    }
    *legacyAddress = addressBuffer;
    return OK;
}

ConversionResult<AudioDevice> legacy2aidl_audio_device_AudioDevice(
        audio_devices_t legacyType, const char* legacyAddress) {
    const std::string stringAddress = VALUE_OR_RETURN(
            legacy2aidl_string(legacyAddress, AUDIO_DEVICE_MAX_ADDRESS_LEN));
    return legacy2aidl_audio_device_AudioDevice(legacyType, stringAddress);
}

ConversionResult<AudioDevice>
legacy2aidl_audio_device_AudioDevice(
        audio_devices_t legacyType, const String8& legacyAddress) {
    const std::string stringAddress = VALUE_OR_RETURN(legacy2aidl_String8_string(legacyAddress));
    return legacy2aidl_audio_device_AudioDevice(legacyType, stringAddress);
}

ConversionResult<AudioDevice>
legacy2aidl_audio_device_AudioDevice(
        audio_devices_t legacyType, const std::string& legacyAddress) {
    using Tag = AudioDeviceAddress::Tag;
    AudioDevice aidl;
    aidl.type = VALUE_OR_RETURN(
            legacy2aidl_audio_devices_t_AudioDeviceDescription(legacyType));
    // 'legacyAddress' can be empty even when the connection type is not.
    // This happens for device ports that act as "blueprints". In this case
    // we pass an empty string using the 'id' variant.
    if (!legacyAddress.empty()) {
        switch (suggestDeviceAddressTag(aidl.type)) {
            case Tag::mac: {
                // special case for anonymized mac address:
                // change anonymized bytes so that they can be scanned as HEX bytes
                // Use '01' for LSB bits 0 and 1 as Bluetooth MAC addresses are never multicast
                // and universaly administered
                std::string address = legacyAddress;
                if (address.compare(0, strlen("XX:XX:XX:XX"), "XX:XX:XX:XX") == 0) {
                    address.replace(0, strlen("XX:XX:XX:XX"), "FD:FF:FF:FF");
                }

                std::vector<uint8_t> mac(6);
                int status = sscanf(address.c_str(), "%hhX:%hhX:%hhX:%hhX:%hhX:%hhX",
                        &mac[0], &mac[1], &mac[2], &mac[3], &mac[4], &mac[5]);
                if (status != mac.size()) {
                    ALOGE("%s: malformed MAC address: \"%s\"", __func__, address.c_str());
                    return unexpected(BAD_VALUE);
                }
                aidl.address = AudioDeviceAddress::make<AudioDeviceAddress::mac>(std::move(mac));
            } break;
            case Tag::ipv4: {
                std::vector<uint8_t> ipv4(4);
                int status = sscanf(legacyAddress.c_str(), "%hhu.%hhu.%hhu.%hhu",
                        &ipv4[0], &ipv4[1], &ipv4[2], &ipv4[3]);
                if (status != ipv4.size()) {
                    ALOGE("%s: malformed IPv4 address: \"%s\"", __func__, legacyAddress.c_str());
                    return unexpected(BAD_VALUE);
                }
                aidl.address = AudioDeviceAddress::make<AudioDeviceAddress::ipv4>(std::move(ipv4));
            } break;
            case Tag::ipv6: {
                std::vector<int32_t> ipv6(8);
                int status = sscanf(legacyAddress.c_str(), "%X:%X:%X:%X:%X:%X:%X:%X",
                        &ipv6[0], &ipv6[1], &ipv6[2], &ipv6[3], &ipv6[4], &ipv6[5], &ipv6[6],
                        &ipv6[7]);
                if (status != ipv6.size()) {
                    ALOGE("%s: malformed IPv6 address: \"%s\"", __func__, legacyAddress.c_str());
                    return unexpected(BAD_VALUE);
                }
                aidl.address = AudioDeviceAddress::make<AudioDeviceAddress::ipv6>(std::move(ipv6));
            } break;
            case Tag::alsa: {
                std::vector<int32_t> alsa(2);
                int status = sscanf(legacyAddress.c_str(), "card=%d;device=%d", &alsa[0], &alsa[1]);
                if (status != alsa.size()) {
                    ALOGE("%s: malformed ALSA address: \"%s\"", __func__, legacyAddress.c_str());
                    return unexpected(BAD_VALUE);
                }
                aidl.address = AudioDeviceAddress::make<AudioDeviceAddress::alsa>(std::move(alsa));
            } break;
            case Tag::id: {
                aidl.address = AudioDeviceAddress::make<AudioDeviceAddress::id>(legacyAddress);
            } break;
        }
    } else {
        aidl.address = AudioDeviceAddress::make<AudioDeviceAddress::id>(legacyAddress);
    }
    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<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;
        case AudioInputFlags::HOTWORD_TAP:
            return AUDIO_INPUT_FLAG_HOTWORD_TAP;
        case AudioInputFlags::HW_LOOKBACK:
            return AUDIO_INPUT_FLAG_HW_LOOKBACK;
    }
    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;
        case AUDIO_INPUT_FLAG_HOTWORD_TAP:
            return AudioInputFlags::HOTWORD_TAP;
        case AUDIO_INPUT_FLAG_HW_LOOKBACK:
            return AudioInputFlags::HW_LOOKBACK;
    }
    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_flags_mask_t>
aidl2legacy_AudioFlag_audio_flags_mask_t(AudioFlag aidl) {
    switch (aidl) {
        case AudioFlag::NONE:
            return AUDIO_FLAG_NONE;
        case AudioFlag::AUDIBILITY_ENFORCED:
            return AUDIO_FLAG_AUDIBILITY_ENFORCED;
        // The is no AudioFlag::SECURE, see the comment in the AudioFlag.aidl
        //  return AUDIO_FLAG_SECURE;
        case AudioFlag::SCO:
            return AUDIO_FLAG_SCO;
        case AudioFlag::BEACON:
            return AUDIO_FLAG_BEACON;
        case AudioFlag::HW_AV_SYNC:
            return AUDIO_FLAG_HW_AV_SYNC;
        case AudioFlag::HW_HOTWORD:
            return AUDIO_FLAG_HW_HOTWORD;
        case AudioFlag::BYPASS_INTERRUPTION_POLICY:
            return AUDIO_FLAG_BYPASS_INTERRUPTION_POLICY;
        case AudioFlag::BYPASS_MUTE:
            return AUDIO_FLAG_BYPASS_MUTE;
        case AudioFlag::LOW_LATENCY:
            return AUDIO_FLAG_LOW_LATENCY;
        case AudioFlag::DEEP_BUFFER:
            return AUDIO_FLAG_DEEP_BUFFER;
        case AudioFlag::NO_MEDIA_PROJECTION:
            return AUDIO_FLAG_NO_MEDIA_PROJECTION;
        case AudioFlag::MUTE_HAPTIC:
            return AUDIO_FLAG_MUTE_HAPTIC;
        case AudioFlag::NO_SYSTEM_CAPTURE:
            return AUDIO_FLAG_NO_SYSTEM_CAPTURE;
        case AudioFlag::CAPTURE_PRIVATE:
            return AUDIO_FLAG_CAPTURE_PRIVATE;
        case AudioFlag::CONTENT_SPATIALIZED:
            return AUDIO_FLAG_CONTENT_SPATIALIZED;
        case AudioFlag::NEVER_SPATIALIZE:
            return AUDIO_FLAG_NEVER_SPATIALIZE;
        case AudioFlag::CALL_REDIRECTION:
            return AUDIO_FLAG_CALL_REDIRECTION;
    }
    return unexpected(BAD_VALUE);
}

ConversionResult<AudioFlag>
legacy2aidl_audio_flags_mask_t_AudioFlag(audio_flags_mask_t legacy) {
    switch (legacy) {
        case AUDIO_FLAG_NONE:
            return AudioFlag::NONE;
        case AUDIO_FLAG_AUDIBILITY_ENFORCED:
            return AudioFlag::AUDIBILITY_ENFORCED;
        case AUDIO_FLAG_SECURE:
            return unexpected(BAD_VALUE);
        case AUDIO_FLAG_SCO:
            return AudioFlag::SCO;
        case AUDIO_FLAG_BEACON:
            return AudioFlag::BEACON;
        case AUDIO_FLAG_HW_AV_SYNC:
            return AudioFlag::HW_AV_SYNC;
        case AUDIO_FLAG_HW_HOTWORD:
            return AudioFlag::HW_HOTWORD;
        case AUDIO_FLAG_BYPASS_INTERRUPTION_POLICY:
            return AudioFlag::BYPASS_INTERRUPTION_POLICY;
        case AUDIO_FLAG_BYPASS_MUTE:
            return AudioFlag::BYPASS_MUTE;
        case AUDIO_FLAG_LOW_LATENCY:
            return AudioFlag::LOW_LATENCY;
        case AUDIO_FLAG_DEEP_BUFFER:
            return AudioFlag::DEEP_BUFFER;
        case AUDIO_FLAG_NO_MEDIA_PROJECTION:
            return AudioFlag::NO_MEDIA_PROJECTION;
        case AUDIO_FLAG_MUTE_HAPTIC:
            return AudioFlag::MUTE_HAPTIC;
        case AUDIO_FLAG_NO_SYSTEM_CAPTURE:
            return AudioFlag::NO_SYSTEM_CAPTURE;
        case AUDIO_FLAG_CAPTURE_PRIVATE:
            return AudioFlag::CAPTURE_PRIVATE;
        case AUDIO_FLAG_CONTENT_SPATIALIZED:
            return AudioFlag::CONTENT_SPATIALIZED;
        case AUDIO_FLAG_NEVER_SPATIALIZE:
            return AudioFlag::NEVER_SPATIALIZE;
        case AUDIO_FLAG_CALL_REDIRECTION:
            return AudioFlag::CALL_REDIRECTION;
    }
    return unexpected(BAD_VALUE);
}

ConversionResult<audio_flags_mask_t>
aidl2legacy_int32_t_audio_flags_mask_t_mask(int32_t aidl) {
    return convertBitmask<audio_flags_mask_t, int32_t, audio_flags_mask_t, AudioFlag>(
            aidl, aidl2legacy_AudioFlag_audio_flags_mask_t, indexToEnum_bitmask<AudioFlag>,
            enumToMask_bitmask<audio_flags_mask_t, audio_flags_mask_t>);
}

ConversionResult<int32_t>
legacy2aidl_audio_flags_mask_t_int32_t_mask(audio_flags_mask_t legacy) {
    return convertBitmask<int32_t, audio_flags_mask_t, AudioFlag, audio_flags_mask_t>(
            legacy, legacy2aidl_audio_flags_mask_t_AudioFlag,
            indexToEnum_bitmask<audio_flags_mask_t>,
            enumToMask_bitmask<int32_t, AudioFlag>);
}

ConversionResult<std::string>
aidl2legacy_AudioTags_string(const std::vector<std::string>& aidl) {
    std::ostringstream tagsBuffer;
    bool hasValue = false;
    for (const auto& tag : aidl) {
        if (hasValue) {
            tagsBuffer << AUDIO_ATTRIBUTES_TAGS_SEPARATOR;
        }
        if (strchr(tag.c_str(), AUDIO_ATTRIBUTES_TAGS_SEPARATOR) == nullptr) {
            tagsBuffer << tag;
            hasValue = true;
        } else {
            ALOGE("Tag is ill-formed: \"%s\"", tag.c_str());
            return unexpected(BAD_VALUE);
        }
    }
    return tagsBuffer.str();
}

ConversionResult<std::vector<std::string>>
legacy2aidl_string_AudioTags(const std::string& legacy) {
    return splitString(legacy, AUDIO_ATTRIBUTES_TAGS_SEPARATOR);
}

ConversionResult<audio_attributes_t>
aidl2legacy_AudioAttributes_audio_attributes_t(const AudioAttributes& aidl) {
    audio_attributes_t legacy;
    legacy.content_type = VALUE_OR_RETURN(
            aidl2legacy_AudioContentType_audio_content_type_t(aidl.contentType));
    legacy.usage = VALUE_OR_RETURN(aidl2legacy_AudioUsage_audio_usage_t(aidl.usage));
    legacy.source = VALUE_OR_RETURN(aidl2legacy_AudioSource_audio_source_t(aidl.source));
    legacy.flags = VALUE_OR_RETURN(aidl2legacy_int32_t_audio_flags_mask_t_mask(aidl.flags));
    auto tagsString = VALUE_OR_RETURN(aidl2legacy_AudioTags_string(aidl.tags));
    RETURN_IF_ERROR(aidl2legacy_string(tagsString, legacy.tags, sizeof(legacy.tags)));
    return legacy;
}

ConversionResult<AudioAttributes>
legacy2aidl_audio_attributes_t_AudioAttributes(const audio_attributes_t& legacy) {
    AudioAttributes aidl;
    aidl.contentType = VALUE_OR_RETURN(
            legacy2aidl_audio_content_type_t_AudioContentType(legacy.content_type));
    aidl.usage = VALUE_OR_RETURN(legacy2aidl_audio_usage_t_AudioUsage(legacy.usage));
    aidl.source = VALUE_OR_RETURN(legacy2aidl_audio_source_t_AudioSource(legacy.source));
    aidl.flags = VALUE_OR_RETURN(legacy2aidl_audio_flags_mask_t_int32_t_mask(legacy.flags));
    auto tagsString = VALUE_OR_RETURN(legacy2aidl_string(legacy.tags, sizeof(legacy.tags)));
    aidl.tags = VALUE_OR_RETURN(legacy2aidl_string_AudioTags(tagsString));
    return aidl;
}

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<int32_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<int32_t>(aidl.bitWidth));
    legacy.offload_buffer_size = VALUE_OR_RETURN(convertIntegral<int32_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<AudioPortDirection> portDirection(audio_port_role_t role, audio_port_type_t type) {
    switch (type) {
        case AUDIO_PORT_TYPE_NONE:
        case AUDIO_PORT_TYPE_SESSION:
            break;  // must be listed  -Werror,-Wswitch
        case AUDIO_PORT_TYPE_DEVICE:
            switch (role) {
                case AUDIO_PORT_ROLE_NONE:
                     break;  // must be listed  -Werror,-Wswitch
                case AUDIO_PORT_ROLE_SOURCE:
                    return AudioPortDirection::INPUT;
                case AUDIO_PORT_ROLE_SINK:
                    return AudioPortDirection::OUTPUT;
            }
            break;
        case AUDIO_PORT_TYPE_MIX:
            switch (role) {
                case AUDIO_PORT_ROLE_NONE:
                     break;  // must be listed  -Werror,-Wswitch
                case AUDIO_PORT_ROLE_SOURCE:
                    return AudioPortDirection::OUTPUT;
                case AUDIO_PORT_ROLE_SINK:
                    return AudioPortDirection::INPUT;
            }
            break;
    }
    return unexpected(BAD_VALUE);
}

ConversionResult<audio_port_role_t> portRole(AudioPortDirection direction, audio_port_type_t type) {
    switch (type) {
        case AUDIO_PORT_TYPE_NONE:
        case AUDIO_PORT_TYPE_SESSION:
            break;  // must be listed  -Werror,-Wswitch
        case AUDIO_PORT_TYPE_DEVICE:
            switch (direction) {
                case AudioPortDirection::INPUT:
                    return AUDIO_PORT_ROLE_SOURCE;
                case AudioPortDirection::OUTPUT:
                    return AUDIO_PORT_ROLE_SINK;
            }
            break;
        case AUDIO_PORT_TYPE_MIX:
            switch (direction) {
                case AudioPortDirection::OUTPUT:
                    return AUDIO_PORT_ROLE_SOURCE;
                case AudioPortDirection::INPUT:
                    return AUDIO_PORT_ROLE_SINK;
            }
            break;
    }
    return unexpected(BAD_VALUE);
}

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<int>(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_port_config_mix_ext_usecase>
aidl2legacy_AudioPortMixExtUseCase_audio_port_config_mix_ext_usecase(
        const AudioPortMixExtUseCase& aidl, bool isInput) {
    audio_port_config_mix_ext_usecase legacy{};
    if (aidl.getTag() != AudioPortMixExtUseCase::Tag::unspecified) {
        if (!isInput) {
            legacy.stream = VALUE_OR_RETURN(aidl2legacy_AudioStreamType_audio_stream_type_t(
                            VALUE_OR_RETURN(UNION_GET(aidl, stream))));
        } else {
            legacy.source = VALUE_OR_RETURN(aidl2legacy_AudioSource_audio_source_t(
                            VALUE_OR_RETURN(UNION_GET(aidl, source))));
        }
    }
    return legacy;
}

ConversionResult<AudioPortMixExtUseCase>
legacy2aidl_audio_port_config_mix_ext_usecase_AudioPortMixExtUseCase(
        const audio_port_config_mix_ext_usecase& legacy, bool isInput) {
    AudioPortMixExtUseCase aidl;
    if (!isInput) {
        UNION_SET(aidl, stream, VALUE_OR_RETURN(
                        legacy2aidl_audio_stream_type_t_AudioStreamType(legacy.stream)));
    } else {
        UNION_SET(aidl, source, VALUE_OR_RETURN(
                        legacy2aidl_audio_source_t_AudioSource(legacy.source)));
    }
    return aidl;
}

ConversionResult<audio_port_config_mix_ext> aidl2legacy_AudioPortMixExt_audio_port_config_mix_ext(
        const AudioPortMixExt& aidl, bool isInput) {
    audio_port_config_mix_ext legacy{};
    legacy.handle = VALUE_OR_RETURN(aidl2legacy_int32_t_audio_io_handle_t(aidl.handle));
    legacy.usecase = VALUE_OR_RETURN(
            aidl2legacy_AudioPortMixExtUseCase_audio_port_config_mix_ext_usecase(
                    aidl.usecase, isInput));
    return legacy;
}

ConversionResult<AudioPortMixExt> legacy2aidl_audio_port_config_mix_ext_AudioPortMixExt(
        const audio_port_config_mix_ext& legacy, bool isInput) {
    AudioPortMixExt aidl;
    aidl.handle = VALUE_OR_RETURN(legacy2aidl_audio_io_handle_t_int32_t(legacy.handle));
    aidl.usecase = VALUE_OR_RETURN(
            legacy2aidl_audio_port_config_mix_ext_usecase_AudioPortMixExtUseCase(
                    legacy.usecase, isInput));
    return aidl;
}

ConversionResult<audio_port_config_device_ext>
aidl2legacy_AudioPortDeviceExt_audio_port_config_device_ext(const AudioPortDeviceExt& aidl) {
    audio_port_config_device_ext legacy{};
    RETURN_IF_ERROR(aidl2legacy_AudioDevice_audio_device(
                    aidl.device, &legacy.type, legacy.address));
    return legacy;
}

ConversionResult<AudioPortDeviceExt> legacy2aidl_audio_port_config_device_ext_AudioPortDeviceExt(
        const audio_port_config_device_ext& legacy) {
    AudioPortDeviceExt aidl;
    aidl.device = VALUE_OR_RETURN(
            legacy2aidl_audio_device_AudioDevice(legacy.type, legacy.address));
    return aidl;
}

// This type is unnamed in the original definition, thus we name it here.
using audio_port_config_ext = decltype(audio_port_config::ext);

status_t aidl2legacy_AudioPortExt_audio_port_config_ext(
        const AudioPortExt& aidl, bool isInput,
        audio_port_config_ext* legacy, audio_port_type_t* type) {
    switch (aidl.getTag()) {
        case AudioPortExt::Tag::unspecified:
            // Just verify that the union is empty.
            VALUE_OR_RETURN_STATUS(UNION_GET(aidl, unspecified));
            *legacy = {};
            *type = AUDIO_PORT_TYPE_NONE;
            return OK;
        case AudioPortExt::Tag::device:
            legacy->device = VALUE_OR_RETURN_STATUS(
                    aidl2legacy_AudioPortDeviceExt_audio_port_config_device_ext(
                            VALUE_OR_RETURN_STATUS(UNION_GET(aidl, device))));
            *type = AUDIO_PORT_TYPE_DEVICE;
            return OK;
        case AudioPortExt::Tag::mix:
            legacy->mix = VALUE_OR_RETURN_STATUS(
                    aidl2legacy_AudioPortMixExt_audio_port_config_mix_ext(
                            VALUE_OR_RETURN_STATUS(UNION_GET(aidl, mix)), isInput));
            *type = AUDIO_PORT_TYPE_MIX;
            return OK;
        case AudioPortExt::Tag::session:
            // This variant is not used in the HAL scenario.
            legacy->session.session = AUDIO_SESSION_NONE;
            *type = AUDIO_PORT_TYPE_SESSION;
            return OK;

    }
    LOG_ALWAYS_FATAL("Shouldn't get here"); // with -Werror,-Wswitch may compile-time fail
}

ConversionResult<AudioPortExt> legacy2aidl_audio_port_config_ext_AudioPortExt(
        const audio_port_config_ext& legacy, audio_port_type_t type, bool isInput) {
    AudioPortExt aidl;
    switch (type) {
        case AUDIO_PORT_TYPE_NONE:
            UNION_SET(aidl, unspecified, false);
            return aidl;
        case AUDIO_PORT_TYPE_DEVICE: {
            AudioPortDeviceExt device = VALUE_OR_RETURN(
                    legacy2aidl_audio_port_config_device_ext_AudioPortDeviceExt(legacy.device));
            UNION_SET(aidl, device, device);
            return aidl;
        }
        case AUDIO_PORT_TYPE_MIX: {
            AudioPortMixExt mix = VALUE_OR_RETURN(
                    legacy2aidl_audio_port_config_mix_ext_AudioPortMixExt(legacy.mix, isInput));
            UNION_SET(aidl, mix, mix);
            return aidl;
        }
        case AUDIO_PORT_TYPE_SESSION:
            // This variant is not used in the HAL scenario.
            UNION_SET(aidl, unspecified, false);
            return aidl;
    }
    LOG_ALWAYS_FATAL("Shouldn't get here"); // with -Werror,-Wswitch may compile-time fail
}

status_t aidl2legacy_AudioPortConfig_audio_port_config(
        const AudioPortConfig& aidl, bool isInput, audio_port_config* legacy, int32_t* portId) {
    legacy->id = VALUE_OR_RETURN_STATUS(aidl2legacy_int32_t_audio_port_handle_t(aidl.id));
    *portId = aidl.portId;
    if (aidl.sampleRate.has_value()) {
        legacy->sample_rate = VALUE_OR_RETURN_STATUS(
                convertIntegral<unsigned int>(aidl.sampleRate.value().value));
        legacy->config_mask |= AUDIO_PORT_CONFIG_SAMPLE_RATE;
    }
    if (aidl.channelMask.has_value()) {
        legacy->channel_mask =
                VALUE_OR_RETURN_STATUS(
                        aidl2legacy_AudioChannelLayout_audio_channel_mask_t(
                                aidl.channelMask.value(), isInput));
        legacy->config_mask |= AUDIO_PORT_CONFIG_CHANNEL_MASK;
    }
    if (aidl.format.has_value()) {
        legacy->format = VALUE_OR_RETURN_STATUS(
                aidl2legacy_AudioFormatDescription_audio_format_t(aidl.format.value()));
        legacy->config_mask |= AUDIO_PORT_CONFIG_FORMAT;
    }
    if (aidl.gain.has_value()) {
        legacy->gain = VALUE_OR_RETURN_STATUS(aidl2legacy_AudioGainConfig_audio_gain_config(
                        aidl.gain.value(), isInput));
        legacy->config_mask |= AUDIO_PORT_CONFIG_GAIN;
    }
    if (aidl.flags.has_value()) {
        legacy->flags = VALUE_OR_RETURN_STATUS(
                aidl2legacy_AudioIoFlags_audio_io_flags(aidl.flags.value(), isInput));
        legacy->config_mask |= AUDIO_PORT_CONFIG_FLAGS;
    }
    RETURN_STATUS_IF_ERROR(aidl2legacy_AudioPortExt_audio_port_config_ext(
                    aidl.ext, isInput, &legacy->ext, &legacy->type));
    legacy->role = VALUE_OR_RETURN_STATUS(portRole(isInput ?
                    AudioPortDirection::INPUT : AudioPortDirection::OUTPUT, legacy->type));
    return OK;
}

ConversionResult<AudioPortConfig>
legacy2aidl_audio_port_config_AudioPortConfig(
        const audio_port_config& legacy, bool isInput, int32_t portId) {
    AudioPortConfig aidl;
    aidl.id = VALUE_OR_RETURN(legacy2aidl_audio_port_handle_t_int32_t(legacy.id));
    aidl.portId = portId;
    if (legacy.config_mask & AUDIO_PORT_CONFIG_SAMPLE_RATE) {
        Int aidl_sampleRate;
        aidl_sampleRate.value = VALUE_OR_RETURN(convertIntegral<int32_t>(legacy.sample_rate));
        aidl.sampleRate = aidl_sampleRate;
    }
    if (legacy.config_mask & AUDIO_PORT_CONFIG_CHANNEL_MASK) {
        aidl.channelMask = VALUE_OR_RETURN(
                legacy2aidl_audio_channel_mask_t_AudioChannelLayout(legacy.channel_mask, isInput));
    }
    if (legacy.config_mask & AUDIO_PORT_CONFIG_FORMAT) {
        aidl.format = VALUE_OR_RETURN(
                legacy2aidl_audio_format_t_AudioFormatDescription(legacy.format));
    }
    if (legacy.config_mask & AUDIO_PORT_CONFIG_GAIN) {
        aidl.gain = VALUE_OR_RETURN(
                legacy2aidl_audio_gain_config_AudioGainConfig(legacy.gain, isInput));
    }
    if (legacy.config_mask & AUDIO_PORT_CONFIG_FLAGS) {
        aidl.flags = VALUE_OR_RETURN(
                legacy2aidl_audio_io_flags_AudioIoFlags(legacy.flags, isInput));
    }
    aidl.ext = VALUE_OR_RETURN(
            legacy2aidl_audio_port_config_ext_AudioPortExt(legacy.ext, legacy.type, isInput));
    return aidl;
}

ConversionResult<audio_port_mix_ext> aidl2legacy_AudioPortMixExt_audio_port_mix_ext(
        const AudioPortMixExt& aidl) {
    audio_port_mix_ext legacy{};
    legacy.handle = VALUE_OR_RETURN(aidl2legacy_int32_t_audio_io_handle_t(aidl.handle));
    return legacy;
}

ConversionResult<AudioPortMixExt> legacy2aidl_audio_port_mix_ext_AudioPortMixExt(
        const audio_port_mix_ext& legacy) {
    AudioPortMixExt aidl;
    aidl.handle = VALUE_OR_RETURN(legacy2aidl_audio_io_handle_t_int32_t(legacy.handle));
    return aidl;
}

ConversionResult<audio_port_device_ext>
aidl2legacy_AudioPortDeviceExt_audio_port_device_ext(const AudioPortDeviceExt& aidl) {
    audio_port_device_ext legacy{};
    RETURN_IF_ERROR(aidl2legacy_AudioDevice_audio_device(
                    aidl.device, &legacy.type, legacy.address));
    legacy.encapsulation_modes = VALUE_OR_RETURN(
            aidl2legacy_AudioEncapsulationMode_mask(aidl.encapsulationModes));
    legacy.encapsulation_metadata_types = VALUE_OR_RETURN(
            aidl2legacy_AudioEncapsulationMetadataType_mask(
                    aidl.encapsulationMetadataTypes));
    return legacy;
}

ConversionResult<AudioPortDeviceExt> legacy2aidl_audio_port_device_ext_AudioPortDeviceExt(
        const audio_port_device_ext& legacy) {
    AudioPortDeviceExt aidl;
    aidl.device = VALUE_OR_RETURN(
            legacy2aidl_audio_device_AudioDevice(legacy.type, legacy.address));
    aidl.encapsulationModes = VALUE_OR_RETURN(
            legacy2aidl_AudioEncapsulationMode_mask(legacy.encapsulation_modes));
    aidl.encapsulationMetadataTypes = VALUE_OR_RETURN(
            legacy2aidl_AudioEncapsulationMetadataType_mask(legacy.encapsulation_metadata_types));
    return aidl;
}

// This type is unnamed in the original definition, thus we name it here.
using audio_port_v7_ext = decltype(audio_port_v7::ext);

status_t aidl2legacy_AudioPortExt_audio_port_v7_ext(
        const AudioPortExt& aidl, audio_port_v7_ext* legacy, audio_port_type_t* type) {
    switch (aidl.getTag()) {
        case AudioPortExt::Tag::unspecified:
            // Just verify that the union is empty.
            VALUE_OR_RETURN_STATUS(UNION_GET(aidl, unspecified));
            *legacy = {};
            *type = AUDIO_PORT_TYPE_NONE;
            return OK;
        case AudioPortExt::Tag::device:
            legacy->device = VALUE_OR_RETURN_STATUS(
                    aidl2legacy_AudioPortDeviceExt_audio_port_device_ext(
                            VALUE_OR_RETURN_STATUS(UNION_GET(aidl, device))));
            *type = AUDIO_PORT_TYPE_DEVICE;
            return OK;
        case AudioPortExt::Tag::mix:
            legacy->mix = VALUE_OR_RETURN_STATUS(
                    aidl2legacy_AudioPortMixExt_audio_port_mix_ext(
                            VALUE_OR_RETURN_STATUS(UNION_GET(aidl, mix))));
            *type = AUDIO_PORT_TYPE_MIX;
            return OK;
        case AudioPortExt::Tag::session:
            // This variant is not used in the HAL scenario.
            legacy->session.session = AUDIO_SESSION_NONE;
            *type = AUDIO_PORT_TYPE_SESSION;
            return OK;

    }
    LOG_ALWAYS_FATAL("Shouldn't get here"); // with -Werror,-Wswitch may compile-time fail
}

ConversionResult<AudioPortExt> legacy2aidl_audio_port_v7_ext_AudioPortExt(
        const audio_port_v7_ext& legacy, audio_port_type_t type) {
    AudioPortExt aidl;
    switch (type) {
        case AUDIO_PORT_TYPE_NONE:
            UNION_SET(aidl, unspecified, false);
            return aidl;
        case AUDIO_PORT_TYPE_DEVICE: {
            AudioPortDeviceExt device = VALUE_OR_RETURN(
                    legacy2aidl_audio_port_device_ext_AudioPortDeviceExt(legacy.device));
            UNION_SET(aidl, device, device);
            return aidl;
        }
        case AUDIO_PORT_TYPE_MIX: {
            AudioPortMixExt mix = VALUE_OR_RETURN(
                    legacy2aidl_audio_port_mix_ext_AudioPortMixExt(legacy.mix));
            UNION_SET(aidl, mix, mix);
            return aidl;
        }
        case AUDIO_PORT_TYPE_SESSION:
            // This variant is not used in the HAL scenario.
            UNION_SET(aidl, unspecified, false);
            return aidl;
    }
    LOG_ALWAYS_FATAL("Shouldn't get here"); // with -Werror,-Wswitch may compile-time fail
}

ConversionResult<audio_port_v7>
aidl2legacy_AudioPort_audio_port_v7(const AudioPort& aidl, bool isInput) {
    audio_port_v7 legacy;
    legacy.id = VALUE_OR_RETURN(aidl2legacy_int32_t_audio_port_handle_t(aidl.id));
    RETURN_IF_ERROR(aidl2legacy_string(aidl.name, legacy.name, sizeof(legacy.name)));

    if (aidl.profiles.size() > std::size(legacy.audio_profiles)) {
        return unexpected(BAD_VALUE);
    }
    RETURN_IF_ERROR(convertRange(
                    aidl.profiles.begin(), aidl.profiles.end(), legacy.audio_profiles,
                    [isInput](const AudioProfile& p) {
                        return aidl2legacy_AudioProfile_audio_profile(p, isInput);
                    }));
    legacy.num_audio_profiles = aidl.profiles.size();

    if (aidl.extraAudioDescriptors.size() > std::size(legacy.extra_audio_descriptors)) {
        return unexpected(BAD_VALUE);
    }
    RETURN_IF_ERROR(
            convertRange(
                    aidl.extraAudioDescriptors.begin(), aidl.extraAudioDescriptors.end(),
                    legacy.extra_audio_descriptors,
                    aidl2legacy_ExtraAudioDescriptor_audio_extra_audio_descriptor));
    legacy.num_extra_audio_descriptors = aidl.extraAudioDescriptors.size();

    if (aidl.gains.size() > std::size(legacy.gains)) {
        return unexpected(BAD_VALUE);
    }
    RETURN_IF_ERROR(convertRange(aidl.gains.begin(), aidl.gains.end(), legacy.gains,
                                 [isInput](const AudioGain& g) {
                                     return aidl2legacy_AudioGain_audio_gain(g, isInput);
                                 }));
    legacy.num_gains = aidl.gains.size();

    RETURN_IF_ERROR(aidl2legacy_AudioPortExt_audio_port_v7_ext(
                    aidl.ext, &legacy.ext, &legacy.type));
    legacy.role = VALUE_OR_RETURN(portRole(
                    isInput ? AudioPortDirection::INPUT : AudioPortDirection::OUTPUT, legacy.type));

    AudioPortConfig aidlPortConfig;
    int32_t portId;
    aidlPortConfig.flags = aidl.flags;
    aidlPortConfig.ext = aidl.ext;
    RETURN_IF_ERROR(aidl2legacy_AudioPortConfig_audio_port_config(
                    aidlPortConfig, isInput, &legacy.active_config, &portId));
    return legacy;
}

ConversionResult<AudioPort>
legacy2aidl_audio_port_v7_AudioPort(const audio_port_v7& legacy, bool isInput) {
    AudioPort aidl;
    aidl.id = VALUE_OR_RETURN(legacy2aidl_audio_port_handle_t_int32_t(legacy.id));
    aidl.name = VALUE_OR_RETURN(legacy2aidl_string(legacy.name, sizeof(legacy.name)));

    if (legacy.num_audio_profiles > std::size(legacy.audio_profiles)) {
        return unexpected(BAD_VALUE);
    }
    RETURN_IF_ERROR(
            convertRange(legacy.audio_profiles, legacy.audio_profiles + legacy.num_audio_profiles,
                         std::back_inserter(aidl.profiles),
                         [isInput](const audio_profile& p) {
                             return legacy2aidl_audio_profile_AudioProfile(p, isInput);
                         }));

    if (legacy.num_extra_audio_descriptors > std::size(legacy.extra_audio_descriptors)) {
        return unexpected(BAD_VALUE);
    }
    aidl.profiles.resize(legacy.num_audio_profiles);
    RETURN_IF_ERROR(
            convertRange(legacy.extra_audio_descriptors,
                    legacy.extra_audio_descriptors + legacy.num_extra_audio_descriptors,
                    std::back_inserter(aidl.extraAudioDescriptors),
                    legacy2aidl_audio_extra_audio_descriptor_ExtraAudioDescriptor));

    if (legacy.num_gains > std::size(legacy.gains)) {
        return unexpected(BAD_VALUE);
    }
    RETURN_IF_ERROR(
            convertRange(legacy.gains, legacy.gains + legacy.num_gains,
                         std::back_inserter(aidl.gains),
                         [isInput](const audio_gain& g) {
                             return legacy2aidl_audio_gain_AudioGain(g, isInput);
                         }));
    aidl.gains.resize(legacy.num_gains);

    aidl.ext = VALUE_OR_RETURN(
            legacy2aidl_audio_port_v7_ext_AudioPortExt(legacy.ext, legacy.type));

    AudioPortConfig aidlPortConfig = VALUE_OR_RETURN(legacy2aidl_audio_port_config_AudioPortConfig(
                    legacy.active_config, isInput, aidl.id));
    if (aidlPortConfig.flags.has_value()) {
        aidl.flags = aidlPortConfig.flags.value();
    } else {
        aidl.flags = isInput ?
                AudioIoFlags::make<AudioIoFlags::Tag::input>(0) :
                AudioIoFlags::make<AudioIoFlags::Tag::output>(0);
    }
    return aidl;
}

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;
        case AudioStandard::SADB:
            return AUDIO_STANDARD_SADB;
        case AudioStandard::VSADB:
            return AUDIO_STANDARD_VSADB;
    }
    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;
        case AUDIO_STANDARD_SADB:
            return AudioStandard::SADB;
        case AUDIO_STANDARD_VSADB:
            return AudioStandard::VSADB;
    }
    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);
}

ConversionResult<audio_dual_mono_mode_t>
aidl2legacy_AudioDualMonoMode_audio_dual_mono_mode_t(AudioDualMonoMode aidl) {
    switch (aidl) {
        case AudioDualMonoMode::OFF:
            return AUDIO_DUAL_MONO_MODE_OFF;
        case AudioDualMonoMode::LR:
            return AUDIO_DUAL_MONO_MODE_LR;
        case AudioDualMonoMode::LL:
            return AUDIO_DUAL_MONO_MODE_LL;
        case AudioDualMonoMode::RR:
            return AUDIO_DUAL_MONO_MODE_RR;
    }
    return unexpected(BAD_VALUE);
}

ConversionResult<AudioDualMonoMode>
legacy2aidl_audio_dual_mono_mode_t_AudioDualMonoMode(audio_dual_mono_mode_t legacy) {
    switch (legacy) {
        case AUDIO_DUAL_MONO_MODE_OFF:
            return AudioDualMonoMode::OFF;
        case AUDIO_DUAL_MONO_MODE_LR:
            return AudioDualMonoMode::LR;
        case AUDIO_DUAL_MONO_MODE_LL:
            return AudioDualMonoMode::LL;
        case AUDIO_DUAL_MONO_MODE_RR:
            return AudioDualMonoMode::RR;
    }
    return unexpected(BAD_VALUE);
}

ConversionResult<audio_timestretch_fallback_mode_t>
aidl2legacy_TimestretchFallbackMode_audio_timestretch_fallback_mode_t(
        AudioPlaybackRate::TimestretchFallbackMode aidl) {
    switch (aidl) {
        case AudioPlaybackRate::TimestretchFallbackMode::SYS_RESERVED_CUT_REPEAT:
            return AUDIO_TIMESTRETCH_FALLBACK_CUT_REPEAT;
        case AudioPlaybackRate::TimestretchFallbackMode::SYS_RESERVED_DEFAULT:
            return AUDIO_TIMESTRETCH_FALLBACK_DEFAULT;
        case AudioPlaybackRate::TimestretchFallbackMode::MUTE:
            return AUDIO_TIMESTRETCH_FALLBACK_MUTE;
        case AudioPlaybackRate::TimestretchFallbackMode::FAIL:
            return AUDIO_TIMESTRETCH_FALLBACK_FAIL;
    }
    return unexpected(BAD_VALUE);
}

ConversionResult<AudioPlaybackRate::TimestretchFallbackMode>
legacy2aidl_audio_timestretch_fallback_mode_t_TimestretchFallbackMode(
        audio_timestretch_fallback_mode_t legacy) {
    switch (legacy) {
        case AUDIO_TIMESTRETCH_FALLBACK_CUT_REPEAT:
            return AudioPlaybackRate::TimestretchFallbackMode::SYS_RESERVED_CUT_REPEAT;
        case AUDIO_TIMESTRETCH_FALLBACK_DEFAULT:
            return AudioPlaybackRate::TimestretchFallbackMode::SYS_RESERVED_DEFAULT;
        case AUDIO_TIMESTRETCH_FALLBACK_MUTE:
            return AudioPlaybackRate::TimestretchFallbackMode::MUTE;
        case AUDIO_TIMESTRETCH_FALLBACK_FAIL:
            return AudioPlaybackRate::TimestretchFallbackMode::FAIL;
    }
    return unexpected(BAD_VALUE);
}

ConversionResult<audio_timestretch_stretch_mode_t>
aidl2legacy_TimestretchMode_audio_timestretch_stretch_mode_t(
        AudioPlaybackRate::TimestretchMode aidl) {
    switch (aidl) {
        case AudioPlaybackRate::TimestretchMode::DEFAULT:
            return AUDIO_TIMESTRETCH_STRETCH_DEFAULT;
        case AudioPlaybackRate::TimestretchMode::VOICE:
            return AUDIO_TIMESTRETCH_STRETCH_VOICE;
    }
    return unexpected(BAD_VALUE);
}

ConversionResult<AudioPlaybackRate::TimestretchMode>
legacy2aidl_audio_timestretch_stretch_mode_t_TimestretchMode(
        audio_timestretch_stretch_mode_t legacy) {
    switch (legacy) {
        case AUDIO_TIMESTRETCH_STRETCH_DEFAULT:
            return AudioPlaybackRate::TimestretchMode::DEFAULT;
        case AUDIO_TIMESTRETCH_STRETCH_VOICE:
            return AudioPlaybackRate::TimestretchMode::VOICE;
    }
    return unexpected(BAD_VALUE);
}

ConversionResult<audio_playback_rate_t>
aidl2legacy_AudioPlaybackRate_audio_playback_rate_t(const AudioPlaybackRate& aidl) {
    audio_playback_rate_t legacy;
    legacy.mSpeed = aidl.speed;
    legacy.mPitch = aidl.pitch;
    legacy.mFallbackMode = VALUE_OR_RETURN(
            aidl2legacy_TimestretchFallbackMode_audio_timestretch_fallback_mode_t(
                    aidl.fallbackMode));
    legacy.mStretchMode = VALUE_OR_RETURN(
            aidl2legacy_TimestretchMode_audio_timestretch_stretch_mode_t(aidl.timestretchMode));
    return legacy;
}

ConversionResult<AudioPlaybackRate>
legacy2aidl_audio_playback_rate_t_AudioPlaybackRate(const audio_playback_rate_t& legacy) {
    AudioPlaybackRate aidl;
    aidl.speed = legacy.mSpeed;
    aidl.pitch = legacy.mPitch;
    aidl.fallbackMode = VALUE_OR_RETURN(
            legacy2aidl_audio_timestretch_fallback_mode_t_TimestretchFallbackMode(
                    legacy.mFallbackMode));
    aidl.timestretchMode = VALUE_OR_RETURN(
            legacy2aidl_audio_timestretch_stretch_mode_t_TimestretchMode(legacy.mStretchMode));
    return aidl;
}

ConversionResult<audio_latency_mode_t>
aidl2legacy_AudioLatencyMode_audio_latency_mode_t(AudioLatencyMode aidl) {
    switch (aidl) {
        case AudioLatencyMode::FREE:
            return AUDIO_LATENCY_MODE_FREE;
        case AudioLatencyMode::LOW:
            return AUDIO_LATENCY_MODE_LOW;
        case AudioLatencyMode::DYNAMIC_SPATIAL_AUDIO_SOFTWARE:
            return AUDIO_LATENCY_MODE_DYNAMIC_SPATIAL_AUDIO_SOFTWARE;
        case AudioLatencyMode::DYNAMIC_SPATIAL_AUDIO_HARDWARE:
            return AUDIO_LATENCY_MODE_DYNAMIC_SPATIAL_AUDIO_HARDWARE;
    }
    return unexpected(BAD_VALUE);
}
ConversionResult<AudioLatencyMode>
legacy2aidl_audio_latency_mode_t_AudioLatencyMode(audio_latency_mode_t legacy) {
    switch (legacy) {
        case AUDIO_LATENCY_MODE_FREE:
            return AudioLatencyMode::FREE;
        case AUDIO_LATENCY_MODE_LOW:
            return AudioLatencyMode::LOW;
        case AUDIO_LATENCY_MODE_DYNAMIC_SPATIAL_AUDIO_SOFTWARE:
            return AudioLatencyMode::DYNAMIC_SPATIAL_AUDIO_SOFTWARE;
        case AUDIO_LATENCY_MODE_DYNAMIC_SPATIAL_AUDIO_HARDWARE:
            return AudioLatencyMode::DYNAMIC_SPATIAL_AUDIO_HARDWARE;
    }
    return unexpected(BAD_VALUE);
}

ConversionResult<audio_microphone_location_t>
aidl2legacy_MicrophoneInfoLocation_audio_microphone_location_t(MicrophoneInfo::Location aidl) {
    switch (aidl) {
        case MicrophoneInfo::Location::UNKNOWN:
            return AUDIO_MICROPHONE_LOCATION_UNKNOWN;
        case MicrophoneInfo::Location::MAINBODY:
            return AUDIO_MICROPHONE_LOCATION_MAINBODY;
        case MicrophoneInfo::Location::MAINBODY_MOVABLE:
            return AUDIO_MICROPHONE_LOCATION_MAINBODY_MOVABLE;
        case MicrophoneInfo::Location::PERIPHERAL:
            return AUDIO_MICROPHONE_LOCATION_PERIPHERAL;
    }
    return unexpected(BAD_VALUE);
}
ConversionResult<MicrophoneInfo::Location>
legacy2aidl_audio_microphone_location_t_MicrophoneInfoLocation(audio_microphone_location_t legacy) {
    switch (legacy) {
        case AUDIO_MICROPHONE_LOCATION_UNKNOWN:
            return MicrophoneInfo::Location::UNKNOWN;
        case AUDIO_MICROPHONE_LOCATION_MAINBODY:
            return MicrophoneInfo::Location::MAINBODY;
        case AUDIO_MICROPHONE_LOCATION_MAINBODY_MOVABLE:
            return MicrophoneInfo::Location::MAINBODY_MOVABLE;
        case AUDIO_MICROPHONE_LOCATION_PERIPHERAL:
            return MicrophoneInfo::Location::PERIPHERAL;
    }
    return unexpected(BAD_VALUE);
}

ConversionResult<audio_microphone_group_t> aidl2legacy_int32_t_audio_microphone_group_t(
        int32_t aidl) {
    return convertReinterpret<audio_microphone_group_t>(aidl);
}

ConversionResult<int32_t> legacy2aidl_audio_microphone_group_t_int32_t(
        audio_microphone_group_t legacy) {
    return convertReinterpret<int32_t>(legacy);
}

ConversionResult<audio_microphone_directionality_t>
aidl2legacy_MicrophoneInfoDirectionality_audio_microphone_directionality_t(
        MicrophoneInfo::Directionality aidl) {
    switch (aidl) {
        case MicrophoneInfo::Directionality::UNKNOWN:
            return AUDIO_MICROPHONE_DIRECTIONALITY_UNKNOWN;
        case MicrophoneInfo::Directionality::OMNI:
            return AUDIO_MICROPHONE_DIRECTIONALITY_OMNI;
        case MicrophoneInfo::Directionality::BI_DIRECTIONAL:
            return AUDIO_MICROPHONE_DIRECTIONALITY_BI_DIRECTIONAL;
        case MicrophoneInfo::Directionality::CARDIOID:
            return AUDIO_MICROPHONE_DIRECTIONALITY_CARDIOID;
        case MicrophoneInfo::Directionality::HYPER_CARDIOID:
            return AUDIO_MICROPHONE_DIRECTIONALITY_HYPER_CARDIOID;
        case MicrophoneInfo::Directionality::SUPER_CARDIOID:
            return AUDIO_MICROPHONE_DIRECTIONALITY_SUPER_CARDIOID;
    }
    return unexpected(BAD_VALUE);
}
ConversionResult<MicrophoneInfo::Directionality>
legacy2aidl_audio_microphone_directionality_t_MicrophoneInfoDirectionality(
        audio_microphone_directionality_t legacy) {
    switch (legacy) {
        case AUDIO_MICROPHONE_DIRECTIONALITY_UNKNOWN:
            return MicrophoneInfo::Directionality::UNKNOWN;
        case AUDIO_MICROPHONE_DIRECTIONALITY_OMNI:
            return MicrophoneInfo::Directionality::OMNI;
        case AUDIO_MICROPHONE_DIRECTIONALITY_BI_DIRECTIONAL:
            return MicrophoneInfo::Directionality::BI_DIRECTIONAL;
        case AUDIO_MICROPHONE_DIRECTIONALITY_CARDIOID:
            return MicrophoneInfo::Directionality::CARDIOID;
        case AUDIO_MICROPHONE_DIRECTIONALITY_HYPER_CARDIOID:
            return MicrophoneInfo::Directionality::HYPER_CARDIOID;
        case AUDIO_MICROPHONE_DIRECTIONALITY_SUPER_CARDIOID:
            return MicrophoneInfo::Directionality::SUPER_CARDIOID;
    }
    return unexpected(BAD_VALUE);
}

ConversionResult<audio_microphone_coordinate>
aidl2legacy_MicrophoneInfoCoordinate_audio_microphone_coordinate(
        const MicrophoneInfo::Coordinate& aidl) {
    audio_microphone_coordinate legacy;
    legacy.x = aidl.x;
    legacy.y = aidl.y;
    legacy.z = aidl.z;
    return legacy;
}
ConversionResult<MicrophoneInfo::Coordinate>
legacy2aidl_audio_microphone_coordinate_MicrophoneInfoCoordinate(
        const audio_microphone_coordinate& legacy) {
    MicrophoneInfo::Coordinate aidl;
    aidl.x = legacy.x;
    aidl.y = legacy.y;
    aidl.z = legacy.z;
    return aidl;
}

ConversionResult<audio_microphone_channel_mapping_t>
aidl2legacy_MicrophoneDynamicInfoChannelMapping_audio_microphone_channel_mapping_t(
        MicrophoneDynamicInfo::ChannelMapping aidl) {
    switch (aidl) {
        case MicrophoneDynamicInfo::ChannelMapping::UNUSED:
            return AUDIO_MICROPHONE_CHANNEL_MAPPING_UNUSED;
        case MicrophoneDynamicInfo::ChannelMapping::DIRECT:
            return AUDIO_MICROPHONE_CHANNEL_MAPPING_DIRECT;
        case MicrophoneDynamicInfo::ChannelMapping::PROCESSED:
            return AUDIO_MICROPHONE_CHANNEL_MAPPING_PROCESSED;
    }
    return unexpected(BAD_VALUE);
}
ConversionResult<MicrophoneDynamicInfo::ChannelMapping>
legacy2aidl_audio_microphone_channel_mapping_t_MicrophoneDynamicInfoChannelMapping(
        audio_microphone_channel_mapping_t legacy) {
    switch (legacy) {
        case AUDIO_MICROPHONE_CHANNEL_MAPPING_UNUSED:
            return MicrophoneDynamicInfo::ChannelMapping::UNUSED;
        case AUDIO_MICROPHONE_CHANNEL_MAPPING_DIRECT:
            return MicrophoneDynamicInfo::ChannelMapping::DIRECT;
        case AUDIO_MICROPHONE_CHANNEL_MAPPING_PROCESSED:
            return MicrophoneDynamicInfo::ChannelMapping::PROCESSED;
    }
    return unexpected(BAD_VALUE);
}

ConversionResult<audio_microphone_characteristic_t>
aidl2legacy_MicrophoneInfos_audio_microphone_characteristic_t(
        const MicrophoneInfo& aidlInfo, const MicrophoneDynamicInfo& aidlDynamic) {
    static const audio_microphone_coordinate kCoordinateUnknown = {
        AUDIO_MICROPHONE_COORDINATE_UNKNOWN, AUDIO_MICROPHONE_COORDINATE_UNKNOWN,
        AUDIO_MICROPHONE_COORDINATE_UNKNOWN };
    audio_microphone_characteristic_t legacy{};
    if (aidlInfo.id != aidlDynamic.id) {
        return unexpected(BAD_VALUE);
    }
    // Note: in the legacy structure, 'device_id' is the mic's ID, 'id' is APM port id.
    RETURN_IF_ERROR(aidl2legacy_string(aidlInfo.id, legacy.device_id, AUDIO_MICROPHONE_ID_MAX_LEN));
    RETURN_IF_ERROR(aidl2legacy_AudioDevice_audio_device(
                    aidlInfo.device, &legacy.device, legacy.address));
    legacy.location = VALUE_OR_RETURN(
            aidl2legacy_MicrophoneInfoLocation_audio_microphone_location_t(aidlInfo.location));
    legacy.group = VALUE_OR_RETURN(aidl2legacy_int32_t_audio_microphone_group_t(aidlInfo.group));
    // For some reason, the legacy field is unsigned, however in the SDK layer it is signed,
    // as it is in AIDL. So, use UINT_MAX for INDEX_IN_THE_GROUP_UNKNOWN which is -1.
    if (aidlInfo.indexInTheGroup != MicrophoneInfo::INDEX_IN_THE_GROUP_UNKNOWN) {
        legacy.index_in_the_group = VALUE_OR_RETURN(
                convertReinterpret<unsigned int>(aidlInfo.indexInTheGroup));
    } else {
        legacy.index_in_the_group = UINT_MAX;
    }
    if (aidlInfo.sensitivity.has_value()) {
        legacy.sensitivity = aidlInfo.sensitivity.value().leveldBFS;
        legacy.max_spl = aidlInfo.sensitivity.value().maxSpldB;
        legacy.min_spl = aidlInfo.sensitivity.value().minSpldB;
    } else {
        legacy.sensitivity = AUDIO_MICROPHONE_SENSITIVITY_UNKNOWN;
        legacy.max_spl = AUDIO_MICROPHONE_SPL_UNKNOWN;
        legacy.min_spl = AUDIO_MICROPHONE_SPL_UNKNOWN;
    }
    legacy.directionality = VALUE_OR_RETURN(
            aidl2legacy_MicrophoneInfoDirectionality_audio_microphone_directionality_t(
                    aidlInfo.directionality));
    if (aidlInfo.frequencyResponse.size() > AUDIO_MICROPHONE_MAX_FREQUENCY_RESPONSES) {
        return unexpected(BAD_VALUE);
    }
    legacy.num_frequency_responses = 0;
    for (const auto& p: aidlInfo.frequencyResponse) {
        legacy.frequency_responses[0][legacy.num_frequency_responses] = p.frequencyHz;
        legacy.frequency_responses[1][legacy.num_frequency_responses++] = p.leveldB;
    }
    if (aidlInfo.position.has_value()) {
        legacy.geometric_location = VALUE_OR_RETURN(
                aidl2legacy_MicrophoneInfoCoordinate_audio_microphone_coordinate(
                        aidlInfo.position.value()));
    } else {
        legacy.geometric_location = kCoordinateUnknown;
    }
    if (aidlInfo.orientation.has_value()) {
        legacy.orientation = VALUE_OR_RETURN(
                aidl2legacy_MicrophoneInfoCoordinate_audio_microphone_coordinate(
                        aidlInfo.orientation.value()));
    } else {
        legacy.orientation = kCoordinateUnknown;
    }
    if (aidlDynamic.channelMapping.size() > AUDIO_CHANNEL_COUNT_MAX) {
        return unexpected(BAD_VALUE);
    }
    size_t i = 0;
    for (; i < aidlDynamic.channelMapping.size(); ++i) {
        legacy.channel_mapping[i] = VALUE_OR_RETURN(
                aidl2legacy_MicrophoneDynamicInfoChannelMapping_audio_microphone_channel_mapping_t(
                        aidlDynamic.channelMapping[i]));
    }
    for (; i < AUDIO_CHANNEL_COUNT_MAX; ++i) {
        legacy.channel_mapping[i] = AUDIO_MICROPHONE_CHANNEL_MAPPING_UNUSED;
    }
    return legacy;
}

status_t
legacy2aidl_audio_microphone_characteristic_t_MicrophoneInfos(
        const audio_microphone_characteristic_t& legacy,
        MicrophoneInfo* aidlInfo, MicrophoneDynamicInfo* aidlDynamic) {
    aidlInfo->id = VALUE_OR_RETURN_STATUS(
            legacy2aidl_string(legacy.device_id, AUDIO_MICROPHONE_ID_MAX_LEN));
    aidlDynamic->id = aidlInfo->id;
    aidlInfo->device = VALUE_OR_RETURN_STATUS(legacy2aidl_audio_device_AudioDevice(
                    legacy.device, legacy.address));
    aidlInfo->location = VALUE_OR_RETURN_STATUS(
            legacy2aidl_audio_microphone_location_t_MicrophoneInfoLocation(legacy.location));
    aidlInfo->group = VALUE_OR_RETURN_STATUS(
            legacy2aidl_audio_microphone_group_t_int32_t(legacy.group));
    // For some reason, the legacy field is unsigned, however in the SDK layer it is signed,
    // as it is in AIDL. So, use UINT_MAX for INDEX_IN_THE_GROUP_UNKNOWN which is -1.
    if (legacy.index_in_the_group != UINT_MAX) {
        aidlInfo->indexInTheGroup = VALUE_OR_RETURN_STATUS(
                convertReinterpret<int32_t>(legacy.index_in_the_group));
    } else {
        aidlInfo->indexInTheGroup = MicrophoneInfo::INDEX_IN_THE_GROUP_UNKNOWN;
    }
    if (legacy.sensitivity != AUDIO_MICROPHONE_SENSITIVITY_UNKNOWN &&
            legacy.max_spl != AUDIO_MICROPHONE_SPL_UNKNOWN &&
            legacy.min_spl != AUDIO_MICROPHONE_SPL_UNKNOWN) {
        MicrophoneInfo::Sensitivity sensitivity;
        sensitivity.leveldBFS = legacy.sensitivity;
        sensitivity.maxSpldB = legacy.max_spl;
        sensitivity.minSpldB = legacy.min_spl;
        aidlInfo->sensitivity = std::move(sensitivity);
    } else {
        aidlInfo->sensitivity = {};
    }
    aidlInfo->directionality = VALUE_OR_RETURN_STATUS(
            legacy2aidl_audio_microphone_directionality_t_MicrophoneInfoDirectionality(
                    legacy.directionality));
    if (legacy.num_frequency_responses > AUDIO_MICROPHONE_MAX_FREQUENCY_RESPONSES) {
        return BAD_VALUE;
    }
    aidlInfo->frequencyResponse.resize(legacy.num_frequency_responses);
    for (size_t i = 0; i < legacy.num_frequency_responses; ++i) {
        aidlInfo->frequencyResponse[i].frequencyHz = legacy.frequency_responses[0][i];
        aidlInfo->frequencyResponse[i].leveldB = legacy.frequency_responses[1][i];
    }
    if (legacy.geometric_location.x != AUDIO_MICROPHONE_COORDINATE_UNKNOWN &&
            legacy.geometric_location.y != AUDIO_MICROPHONE_COORDINATE_UNKNOWN &&
            legacy.geometric_location.z != AUDIO_MICROPHONE_COORDINATE_UNKNOWN) {
        aidlInfo->position = VALUE_OR_RETURN_STATUS(
                legacy2aidl_audio_microphone_coordinate_MicrophoneInfoCoordinate(
                        legacy.geometric_location));
    } else {
        aidlInfo->position = {};
    }
    if (legacy.orientation.x != AUDIO_MICROPHONE_COORDINATE_UNKNOWN &&
            legacy.orientation.y != AUDIO_MICROPHONE_COORDINATE_UNKNOWN &&
            legacy.orientation.z != AUDIO_MICROPHONE_COORDINATE_UNKNOWN) {
        aidlInfo->orientation = VALUE_OR_RETURN_STATUS(
                legacy2aidl_audio_microphone_coordinate_MicrophoneInfoCoordinate(
                        legacy.orientation));
    } else {
        aidlInfo->orientation = {};
    }
    size_t channelsUsed = AUDIO_CHANNEL_COUNT_MAX;
    while (channelsUsed != 0 &&
            legacy.channel_mapping[--channelsUsed] == AUDIO_MICROPHONE_CHANNEL_MAPPING_UNUSED) {}
    // Doing an increment is correct even when channel 0 is 'UNUSED',
    // that's because AIDL requires to have at least 1 element in the mapping.
    ++channelsUsed;
    aidlDynamic->channelMapping.resize(channelsUsed);
    for (size_t i = 0; i < channelsUsed; ++i) {
        aidlDynamic->channelMapping[i] = VALUE_OR_RETURN_STATUS(
                legacy2aidl_audio_microphone_channel_mapping_t_MicrophoneDynamicInfoChannelMapping(
                        legacy.channel_mapping[i]));
    }
    return OK;
}

}  // namespace android

#undef GET_DEVICE_DESC_CONNECTION

#if defined(BACKEND_NDK)
}  // aidl
#endif