diff --git a/camera/ndk/impl/ACameraMetadata.cpp b/camera/ndk/impl/ACameraMetadata.cpp
index 631f6cd..895514e 100644
--- a/camera/ndk/impl/ACameraMetadata.cpp
+++ b/camera/ndk/impl/ACameraMetadata.cpp
@@ -426,6 +426,7 @@
             camera_metadata_ro_entry_t entry;
             int ret = get_camera_metadata_ro_entry(rawMetadata, i, &entry);
             if (ret != 0) {
+                mData->unlock(rawMetadata);
                 ALOGE("%s: error reading metadata index %zu", __FUNCTION__, i);
                 return ACAMERA_ERROR_UNKNOWN;
             }
diff --git a/media/libaudioclient/AidlConversion.cpp b/media/libaudioclient/AidlConversion.cpp
new file mode 100644
index 0000000..95a6a4a
--- /dev/null
+++ b/media/libaudioclient/AidlConversion.cpp
@@ -0,0 +1,1223 @@
+/*
+ * Copyright (C) 2020 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 <limits>
+
+#define LOG_TAG "AidlConversion"
+//#define LOG_NDEBUG 0
+#include <system/audio.h>
+#include <utils/Log.h>
+
+#include "media/AidlConversion.h"
+
+#define VALUE_OR_RETURN(result)                          \
+    ({                                                   \
+        auto _tmp = (result);                            \
+        if (!_tmp.ok()) return unexpected(_tmp.error()); \
+        _tmp.value();                                    \
+    })
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// Utilities
+
+namespace android {
+
+using base::unexpected;
+
+namespace {
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// The code below establishes:
+// IntegralTypeOf<T>, which works for either integral types (in which case it evaluates to T), or
+// enum types (in which case it evaluates to std::underlying_type_T<T>).
+
+template<typename T, typename = std::enable_if_t<std::is_integral_v<T> || std::is_enum_v<T>>>
+struct IntegralTypeOfStruct {
+    using Type = T;
+};
+
+template<typename T>
+struct IntegralTypeOfStruct<T, std::enable_if_t<std::is_enum_v<T>>> {
+    using Type = std::underlying_type_t<T>;
+};
+
+template<typename T>
+using IntegralTypeOf = typename IntegralTypeOfStruct<T>::Type;
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// Utilities for handling bitmasks.
+
+template<typename Enum>
+Enum index2enum_index(int index) {
+    static_assert(std::is_enum_v<Enum> || std::is_integral_v<Enum>);
+    return static_cast<Enum>(index);
+}
+
+template<typename Enum>
+Enum index2enum_bitmask(int index) {
+    static_assert(std::is_enum_v<Enum> || std::is_integral_v<Enum>);
+    return static_cast<Enum>(1 << index);
+}
+
+template<typename Mask, typename Enum>
+Mask enumToMask_bitmask(Enum e) {
+    static_assert(std::is_enum_v<Enum> || std::is_integral_v<Enum>);
+    static_assert(std::is_enum_v<Mask> || std::is_integral_v<Mask>);
+    return static_cast<Mask>(e);
+}
+
+template<typename Mask, typename Enum>
+Mask enumToMask_index(Enum e) {
+    static_assert(std::is_enum_v<Enum> || std::is_integral_v<Enum>);
+    static_assert(std::is_enum_v<Mask> || std::is_integral_v<Mask>);
+    return static_cast<Mask>(static_cast<std::make_unsigned_t<IntegralTypeOf<Mask>>>(1)
+            << static_cast<int>(e));
+}
+
+template<typename DestMask, typename SrcMask, typename DestEnum, typename SrcEnum>
+ConversionResult<DestMask> convertBitmask(
+        SrcMask src, const std::function<ConversionResult<DestEnum>(SrcEnum)>& enumConversion,
+        const std::function<SrcEnum(int)>& srcIndexToEnum,
+        const std::function<DestMask(DestEnum)>& destEnumToMask) {
+    using UnsignedDestMask = std::make_unsigned_t<IntegralTypeOf<DestMask>>;
+    using UnsignedSrcMask = std::make_unsigned_t<IntegralTypeOf<SrcMask>>;
+
+    UnsignedDestMask dest = static_cast<UnsignedDestMask>(0);
+    UnsignedSrcMask usrc = static_cast<UnsignedSrcMask>(src);
+
+    int srcBitIndex = 0;
+    while (usrc != 0) {
+        if (usrc & 1) {
+            SrcEnum srcEnum = srcIndexToEnum(srcBitIndex);
+            DestEnum destEnum = VALUE_OR_RETURN(enumConversion(srcEnum));
+            DestMask destMask = destEnumToMask(destEnum);
+            dest |= destMask;
+        }
+        ++srcBitIndex;
+        usrc >>= 1;
+    }
+    return static_cast<DestMask>(dest);
+}
+
+template<typename Mask, typename Enum>
+bool bitmaskIsSet(Mask mask, Enum index) {
+    return (mask & enumToMask_index<Mask, Enum>(index)) != 0;
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+template<typename To, typename From>
+ConversionResult<To> convertIntegral(From from) {
+    // Special handling is required for signed / vs. unsigned comparisons, since otherwise we may
+    // have the signed converted to unsigned and produce wrong results.
+    if (std::is_signed_v<From> && !std::is_signed_v<To>) {
+        if (from < 0 || from > std::numeric_limits<To>::max()) {
+            return unexpected(BAD_VALUE);
+        }
+    } else if (std::is_signed_v<To> && !std::is_signed_v<From>) {
+        if (from > std::numeric_limits<To>::max()) {
+            return unexpected(BAD_VALUE);
+        }
+    } else {
+        if (from < std::numeric_limits<To>::min() || from > std::numeric_limits<To>::max()) {
+            return unexpected(BAD_VALUE);
+        }
+    }
+    return static_cast<To>(from);
+}
+
+template<typename To, typename From>
+ConversionResult<To> convertReinterpret(From from) {
+    static_assert(sizeof(From) == sizeof(To));
+    return static_cast<To>(from);
+}
+
+enum class Direction {
+    INPUT, OUTPUT
+};
+
+ConversionResult<Direction> direction(media::AudioPortRole role, media::AudioPortType type) {
+    switch (type) {
+        case media::AudioPortType::DEVICE:
+            switch (role) {
+                case media::AudioPortRole::SOURCE:
+                    return Direction::INPUT;
+                case media::AudioPortRole::SINK:
+                    return Direction::OUTPUT;
+                default:
+                    break;
+            }
+            break;
+        case media::AudioPortType::MIX:
+            switch (role) {
+                case media::AudioPortRole::SOURCE:
+                    return Direction::OUTPUT;
+                case media::AudioPortRole::SINK:
+                    return Direction::INPUT;
+                default:
+                    break;
+            }
+            break;
+        default:
+            break;
+    }
+    return unexpected(BAD_VALUE);
+}
+
+ConversionResult<Direction> direction(audio_port_role_t role, audio_port_type_t type) {
+    switch (type) {
+        case AUDIO_PORT_TYPE_DEVICE:
+            switch (role) {
+                case AUDIO_PORT_ROLE_SOURCE:
+                    return Direction::INPUT;
+                case AUDIO_PORT_ROLE_SINK:
+                    return Direction::OUTPUT;
+                default:
+                    break;
+            }
+            break;
+        case AUDIO_PORT_TYPE_MIX:
+            switch (role) {
+                case AUDIO_PORT_ROLE_SOURCE:
+                    return Direction::OUTPUT;
+                case AUDIO_PORT_ROLE_SINK:
+                    return Direction::INPUT;
+                default:
+                    break;
+            }
+            break;
+        default:
+            break;
+    }
+    return unexpected(BAD_VALUE);
+}
+
+}  // namespace
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// Converters
+
+// The legacy enum is unnamed. Thus, we use int.
+ConversionResult<int> aidl2legacy_AudioPortConfigType(media::AudioPortConfigType aidl) {
+    switch (aidl) {
+        case media::AudioPortConfigType::SAMPLE_RATE:
+            return AUDIO_PORT_CONFIG_SAMPLE_RATE;
+        case media::AudioPortConfigType::CHANNEL_MASK:
+            return AUDIO_PORT_CONFIG_CHANNEL_MASK;
+        case media::AudioPortConfigType::FORMAT:
+            return AUDIO_PORT_CONFIG_FORMAT;
+        case media::AudioPortConfigType::FLAGS:
+            return AUDIO_PORT_CONFIG_FLAGS;
+        default:
+            return unexpected(BAD_VALUE);
+    }
+}
+
+// The legacy enum is unnamed. Thus, we use int.
+ConversionResult<media::AudioPortConfigType> legacy2aidl_AudioPortConfigType(int legacy) {
+    switch (legacy) {
+        case AUDIO_PORT_CONFIG_SAMPLE_RATE:
+            return media::AudioPortConfigType::SAMPLE_RATE;
+        case AUDIO_PORT_CONFIG_CHANNEL_MASK:
+            return media::AudioPortConfigType::CHANNEL_MASK;
+        case AUDIO_PORT_CONFIG_FORMAT:
+            return media::AudioPortConfigType::FORMAT;
+        case AUDIO_PORT_CONFIG_FLAGS:
+            return media::AudioPortConfigType::FLAGS;
+        default:
+            return unexpected(BAD_VALUE);
+    }
+}
+
+ConversionResult<unsigned int> aidl2legacy_int32_t_config_mask(int32_t aidl) {
+    return convertBitmask<unsigned int, int32_t, int, media::AudioPortConfigType>(
+            aidl, aidl2legacy_AudioPortConfigType,
+            // AudioPortConfigType enum is index-based.
+            index2enum_index<media::AudioPortConfigType>,
+            // AUDIO_PORT_CONFIG_* flags are mask-based.
+            enumToMask_bitmask<unsigned int, int>);
+}
+
+ConversionResult<int32_t> legacy2aidl_config_mask_int32_t(unsigned int legacy) {
+    return convertBitmask<int32_t, unsigned int, media::AudioPortConfigType, int>(
+            legacy, legacy2aidl_AudioPortConfigType,
+            // AUDIO_PORT_CONFIG_* flags are mask-based.
+            index2enum_bitmask<unsigned>,
+            // AudioPortConfigType enum is index-based.
+            enumToMask_index<int32_t, media::AudioPortConfigType>);
+}
+
+ConversionResult<audio_channel_mask_t> aidl2legacy_int32_t_audio_channel_mask_t(int32_t aidl) {
+    // TODO(ytai): should we convert bit-by-bit?
+    // One problem here is that the representation is both opaque and is different based on the
+    // context (input vs. output). Can determine based on type and role, as per useInChannelMask().
+    return convertReinterpret<audio_channel_mask_t>(aidl);
+}
+
+ConversionResult<int32_t> legacy2aidl_audio_channel_mask_t_int32_t(audio_channel_mask_t legacy) {
+    // TODO(ytai): should we convert bit-by-bit?
+    // One problem here is that the representation is both opaque and is different based on the
+    // context (input vs. output). Can determine based on type and role, as per useInChannelMask().
+    return convertReinterpret<int32_t>(legacy);
+}
+
+ConversionResult<audio_io_config_event> aidl2legacy_AudioIoConfigEvent_audio_io_config_event(
+        media::AudioIoConfigEvent aidl) {
+    switch (aidl) {
+        case media::AudioIoConfigEvent::OUTPUT_REGISTERED:
+            return AUDIO_OUTPUT_REGISTERED;
+        case media::AudioIoConfigEvent::OUTPUT_OPENED:
+            return AUDIO_OUTPUT_OPENED;
+        case media::AudioIoConfigEvent::OUTPUT_CLOSED:
+            return AUDIO_OUTPUT_CLOSED;
+        case media::AudioIoConfigEvent::OUTPUT_CONFIG_CHANGED:
+            return AUDIO_OUTPUT_CONFIG_CHANGED;
+        case media::AudioIoConfigEvent::INPUT_REGISTERED:
+            return AUDIO_INPUT_REGISTERED;
+        case media::AudioIoConfigEvent::INPUT_OPENED:
+            return AUDIO_INPUT_OPENED;
+        case media::AudioIoConfigEvent::INPUT_CLOSED:
+            return AUDIO_INPUT_CLOSED;
+        case media::AudioIoConfigEvent::INPUT_CONFIG_CHANGED:
+            return AUDIO_INPUT_CONFIG_CHANGED;
+        case media::AudioIoConfigEvent::CLIENT_STARTED:
+            return AUDIO_CLIENT_STARTED;
+        default:
+            return unexpected(BAD_VALUE);
+    }
+}
+
+ConversionResult<media::AudioIoConfigEvent> legacy2aidl_audio_io_config_event_AudioIoConfigEvent(
+        audio_io_config_event legacy) {
+    switch (legacy) {
+        case AUDIO_OUTPUT_REGISTERED:
+            return media::AudioIoConfigEvent::OUTPUT_REGISTERED;
+        case AUDIO_OUTPUT_OPENED:
+            return media::AudioIoConfigEvent::OUTPUT_OPENED;
+        case AUDIO_OUTPUT_CLOSED:
+            return media::AudioIoConfigEvent::OUTPUT_CLOSED;
+        case AUDIO_OUTPUT_CONFIG_CHANGED:
+            return media::AudioIoConfigEvent::OUTPUT_CONFIG_CHANGED;
+        case AUDIO_INPUT_REGISTERED:
+            return media::AudioIoConfigEvent::INPUT_REGISTERED;
+        case AUDIO_INPUT_OPENED:
+            return media::AudioIoConfigEvent::INPUT_OPENED;
+        case AUDIO_INPUT_CLOSED:
+            return media::AudioIoConfigEvent::INPUT_CLOSED;
+        case AUDIO_INPUT_CONFIG_CHANGED:
+            return media::AudioIoConfigEvent::INPUT_CONFIG_CHANGED;
+        case AUDIO_CLIENT_STARTED:
+            return media::AudioIoConfigEvent::CLIENT_STARTED;
+        default:
+            return unexpected(BAD_VALUE);
+    }
+}
+
+ConversionResult<audio_port_role_t> aidl2legacy_AudioPortRole_audio_port_role_t(
+        media::AudioPortRole aidl) {
+    switch (aidl) {
+        case media::AudioPortRole::NONE:
+            return AUDIO_PORT_ROLE_NONE;
+        case media::AudioPortRole::SOURCE:
+            return AUDIO_PORT_ROLE_SOURCE;
+        case media::AudioPortRole::SINK:
+            return AUDIO_PORT_ROLE_SINK;
+        default:
+            return unexpected(BAD_VALUE);
+    }
+}
+
+ConversionResult<media::AudioPortRole> legacy2aidl_audio_port_role_t_AudioPortRole(
+        audio_port_role_t legacy) {
+    switch (legacy) {
+        case AUDIO_PORT_ROLE_NONE:
+            return media::AudioPortRole::NONE;
+        case AUDIO_PORT_ROLE_SOURCE:
+            return media::AudioPortRole::SOURCE;
+        case AUDIO_PORT_ROLE_SINK:
+            return media::AudioPortRole::SINK;
+        default:
+            return unexpected(BAD_VALUE);
+    }
+}
+
+ConversionResult<audio_port_type_t> aidl2legacy_AudioPortType_audio_port_type_t(
+        media::AudioPortType aidl) {
+    switch (aidl) {
+        case media::AudioPortType::NONE:
+            return AUDIO_PORT_TYPE_NONE;
+        case media::AudioPortType::DEVICE:
+            return AUDIO_PORT_TYPE_DEVICE;
+        case media::AudioPortType::MIX:
+            return AUDIO_PORT_TYPE_MIX;
+        case media::AudioPortType::SESSION:
+            return AUDIO_PORT_TYPE_SESSION;
+        default:
+            return unexpected(BAD_VALUE);
+    }
+}
+
+ConversionResult<media::AudioPortType> legacy2aidl_audio_port_type_t_AudioPortType(
+        audio_port_type_t legacy) {
+    switch (legacy) {
+        case AUDIO_PORT_TYPE_NONE:
+            return media::AudioPortType::NONE;
+        case AUDIO_PORT_TYPE_DEVICE:
+            return media::AudioPortType::DEVICE;
+        case AUDIO_PORT_TYPE_MIX:
+            return media::AudioPortType::MIX;
+        case AUDIO_PORT_TYPE_SESSION:
+            return media::AudioPortType::SESSION;
+        default:
+            return unexpected(BAD_VALUE);
+    }
+}
+
+ConversionResult<audio_format_t> aidl2legacy_AudioFormat_audio_format_t(
+        media::audio::common::AudioFormat aidl) {
+    // This relies on AudioFormat being kept in sync with audio_format_t.
+    static_assert(sizeof(media::audio::common::AudioFormat) == sizeof(audio_format_t));
+    return static_cast<audio_format_t>(aidl);
+}
+
+ConversionResult<media::audio::common::AudioFormat> legacy2aidl_audio_format_t_AudioFormat(
+        audio_format_t legacy) {
+    // This relies on AudioFormat being kept in sync with audio_format_t.
+    static_assert(sizeof(media::audio::common::AudioFormat) == sizeof(audio_format_t));
+    return static_cast<media::audio::common::AudioFormat>(legacy);
+}
+
+ConversionResult<int> aidl2legacy_AudioGainMode_int(media::AudioGainMode aidl) {
+    switch (aidl) {
+        case media::AudioGainMode::JOINT:
+            return AUDIO_GAIN_MODE_JOINT;
+        case media::AudioGainMode::CHANNELS:
+            return AUDIO_GAIN_MODE_CHANNELS;
+        case media::AudioGainMode::RAMP:
+            return AUDIO_GAIN_MODE_RAMP;
+        default:
+            return unexpected(BAD_VALUE);
+    }
+}
+
+ConversionResult<media::AudioGainMode> legacy2aidl_int_AudioGainMode(int legacy) {
+    switch (legacy) {
+        case AUDIO_GAIN_MODE_JOINT:
+            return media::AudioGainMode::JOINT;
+        case AUDIO_GAIN_MODE_CHANNELS:
+            return media::AudioGainMode::CHANNELS;
+        case AUDIO_GAIN_MODE_RAMP:
+            return media::AudioGainMode::RAMP;
+        default:
+            return unexpected(BAD_VALUE);
+    }
+}
+
+ConversionResult<audio_gain_mode_t> aidl2legacy_int32_t_audio_gain_mode_t(int32_t aidl) {
+    return convertBitmask<audio_gain_mode_t, int32_t, int, media::AudioGainMode>(
+            aidl, aidl2legacy_AudioGainMode_int,
+            // AudioGainMode is index-based.
+            index2enum_index<media::AudioGainMode>,
+            // AUDIO_GAIN_MODE_* constants are mask-based.
+            enumToMask_bitmask<audio_gain_mode_t, int>);
+}
+
+ConversionResult<int32_t> legacy2aidl_audio_gain_mode_t_int32_t(audio_gain_mode_t legacy) {
+    return convertBitmask<int32_t, audio_gain_mode_t, media::AudioGainMode, int>(
+            legacy, legacy2aidl_int_AudioGainMode,
+            // AUDIO_GAIN_MODE_* constants are mask-based.
+            index2enum_bitmask<int>,
+            // AudioGainMode is index-based.
+            enumToMask_index<int32_t, media::AudioGainMode>);
+}
+
+ConversionResult<audio_devices_t> aidl2legacy_int32_t_audio_devices_t(int32_t aidl) {
+    // TODO(ytai): bitfield?
+    return convertReinterpret<audio_devices_t>(aidl);
+}
+
+ConversionResult<int32_t> legacy2aidl_audio_devices_t_int32_t(audio_devices_t legacy) {
+    // TODO(ytai): bitfield?
+    return convertReinterpret<int32_t>(legacy);
+}
+
+ConversionResult<audio_gain_config> aidl2legacy_AudioGainConfig_audio_gain_config(
+        const media::AudioGainConfig& aidl, media::AudioPortRole role, media::AudioPortType type) {
+    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(aidl.mode));
+    legacy.channel_mask =
+            VALUE_OR_RETURN(aidl2legacy_int32_t_audio_channel_mask_t(aidl.channelMask));
+    const bool isInput = VALUE_OR_RETURN(direction(role, type)) == Direction::INPUT;
+    const bool isJoint = bitmaskIsSet(aidl.mode, media::AudioGainMode::JOINT);
+    size_t numValues = isJoint ? 1
+                               : isInput ? audio_channel_count_from_in_mask(legacy.channel_mask)
+                                         : audio_channel_count_from_out_mask(legacy.channel_mask);
+    if (aidl.values.size() != numValues || aidl.values.size() > std::size(legacy.values)) {
+        return unexpected(BAD_VALUE);
+    }
+    for (size_t i = 0; i < numValues; ++i) {
+        legacy.values[i] = VALUE_OR_RETURN(convertIntegral<int>(aidl.values[i]));
+    }
+    legacy.ramp_duration_ms = VALUE_OR_RETURN(convertIntegral<unsigned int>(aidl.rampDurationMs));
+    return legacy;
+}
+
+ConversionResult<media::AudioGainConfig> legacy2aidl_audio_gain_config_AudioGainConfig(
+        const audio_gain_config& legacy, audio_port_role_t role, audio_port_type_t type) {
+    media::AudioGainConfig aidl;
+    aidl.index = VALUE_OR_RETURN(convertIntegral<int32_t>(legacy.index));
+    aidl.mode = VALUE_OR_RETURN(legacy2aidl_audio_gain_mode_t_int32_t(legacy.mode));
+    aidl.channelMask =
+            VALUE_OR_RETURN(legacy2aidl_audio_channel_mask_t_int32_t(legacy.channel_mask));
+    const bool isInput = VALUE_OR_RETURN(direction(role, type)) == Direction::INPUT;
+    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(
+        media::AudioInputFlags aidl) {
+    switch (aidl) {
+        case media::AudioInputFlags::FAST:
+            return AUDIO_INPUT_FLAG_FAST;
+        case media::AudioInputFlags::HW_HOTWORD:
+            return AUDIO_INPUT_FLAG_HW_HOTWORD;
+        case media::AudioInputFlags::RAW:
+            return AUDIO_INPUT_FLAG_RAW;
+        case media::AudioInputFlags::SYNC:
+            return AUDIO_INPUT_FLAG_SYNC;
+        case media::AudioInputFlags::MMAP_NOIRQ:
+            return AUDIO_INPUT_FLAG_MMAP_NOIRQ;
+        case media::AudioInputFlags::VOIP_TX:
+            return AUDIO_INPUT_FLAG_VOIP_TX;
+        case media::AudioInputFlags::HW_AV_SYNC:
+            return AUDIO_INPUT_FLAG_HW_AV_SYNC;
+        case media::AudioInputFlags::DIRECT:
+            return AUDIO_INPUT_FLAG_DIRECT;
+        default:
+            return unexpected(BAD_VALUE);
+    }
+}
+
+ConversionResult<media::AudioInputFlags> legacy2aidl_audio_input_flags_t_AudioInputFlags(
+        audio_input_flags_t legacy) {
+    switch (legacy) {
+        case AUDIO_INPUT_FLAG_FAST:
+            return media::AudioInputFlags::FAST;
+        case AUDIO_INPUT_FLAG_HW_HOTWORD:
+            return media::AudioInputFlags::HW_HOTWORD;
+        case AUDIO_INPUT_FLAG_RAW:
+            return media::AudioInputFlags::RAW;
+        case AUDIO_INPUT_FLAG_SYNC:
+            return media::AudioInputFlags::SYNC;
+        case AUDIO_INPUT_FLAG_MMAP_NOIRQ:
+            return media::AudioInputFlags::MMAP_NOIRQ;
+        case AUDIO_INPUT_FLAG_VOIP_TX:
+            return media::AudioInputFlags::VOIP_TX;
+        case AUDIO_INPUT_FLAG_HW_AV_SYNC:
+            return media::AudioInputFlags::HW_AV_SYNC;
+        case AUDIO_INPUT_FLAG_DIRECT:
+            return media::AudioInputFlags::DIRECT;
+        default:
+            return unexpected(BAD_VALUE);
+    }
+}
+
+ConversionResult<audio_output_flags_t> aidl2legacy_AudioOutputFlags_audio_output_flags_t(
+        media::AudioOutputFlags aidl) {
+    switch (aidl) {
+        case media::AudioOutputFlags::DIRECT:
+            return AUDIO_OUTPUT_FLAG_DIRECT;
+        case media::AudioOutputFlags::PRIMARY:
+            return AUDIO_OUTPUT_FLAG_PRIMARY;
+        case media::AudioOutputFlags::FAST:
+            return AUDIO_OUTPUT_FLAG_FAST;
+        case media::AudioOutputFlags::DEEP_BUFFER:
+            return AUDIO_OUTPUT_FLAG_DEEP_BUFFER;
+        case media::AudioOutputFlags::COMPRESS_OFFLOAD:
+            return AUDIO_OUTPUT_FLAG_COMPRESS_OFFLOAD;
+        case media::AudioOutputFlags::NON_BLOCKING:
+            return AUDIO_OUTPUT_FLAG_NON_BLOCKING;
+        case media::AudioOutputFlags::HW_AV_SYNC:
+            return AUDIO_OUTPUT_FLAG_HW_AV_SYNC;
+        case media::AudioOutputFlags::TTS:
+            return AUDIO_OUTPUT_FLAG_TTS;
+        case media::AudioOutputFlags::RAW:
+            return AUDIO_OUTPUT_FLAG_RAW;
+        case media::AudioOutputFlags::SYNC:
+            return AUDIO_OUTPUT_FLAG_SYNC;
+        case media::AudioOutputFlags::IEC958_NONAUDIO:
+            return AUDIO_OUTPUT_FLAG_IEC958_NONAUDIO;
+        case media::AudioOutputFlags::DIRECT_PCM:
+            return AUDIO_OUTPUT_FLAG_DIRECT_PCM;
+        case media::AudioOutputFlags::MMAP_NOIRQ:
+            return AUDIO_OUTPUT_FLAG_MMAP_NOIRQ;
+        case media::AudioOutputFlags::VOIP_RX:
+            return AUDIO_OUTPUT_FLAG_VOIP_RX;
+        case media::AudioOutputFlags::INCALL_MUSIC:
+            return AUDIO_OUTPUT_FLAG_INCALL_MUSIC;
+        default:
+            return unexpected(BAD_VALUE);
+    }
+}
+
+ConversionResult<media::AudioOutputFlags> legacy2aidl_audio_output_flags_t_AudioOutputFlags(
+        audio_output_flags_t legacy) {
+    switch (legacy) {
+        case AUDIO_OUTPUT_FLAG_DIRECT:
+            return media::AudioOutputFlags::DIRECT;
+        case AUDIO_OUTPUT_FLAG_PRIMARY:
+            return media::AudioOutputFlags::PRIMARY;
+        case AUDIO_OUTPUT_FLAG_FAST:
+            return media::AudioOutputFlags::FAST;
+        case AUDIO_OUTPUT_FLAG_DEEP_BUFFER:
+            return media::AudioOutputFlags::DEEP_BUFFER;
+        case AUDIO_OUTPUT_FLAG_COMPRESS_OFFLOAD:
+            return media::AudioOutputFlags::COMPRESS_OFFLOAD;
+        case AUDIO_OUTPUT_FLAG_NON_BLOCKING:
+            return media::AudioOutputFlags::NON_BLOCKING;
+        case AUDIO_OUTPUT_FLAG_HW_AV_SYNC:
+            return media::AudioOutputFlags::HW_AV_SYNC;
+        case AUDIO_OUTPUT_FLAG_TTS:
+            return media::AudioOutputFlags::TTS;
+        case AUDIO_OUTPUT_FLAG_RAW:
+            return media::AudioOutputFlags::RAW;
+        case AUDIO_OUTPUT_FLAG_SYNC:
+            return media::AudioOutputFlags::SYNC;
+        case AUDIO_OUTPUT_FLAG_IEC958_NONAUDIO:
+            return media::AudioOutputFlags::IEC958_NONAUDIO;
+        case AUDIO_OUTPUT_FLAG_DIRECT_PCM:
+            return media::AudioOutputFlags::DIRECT_PCM;
+        case AUDIO_OUTPUT_FLAG_MMAP_NOIRQ:
+            return media::AudioOutputFlags::MMAP_NOIRQ;
+        case AUDIO_OUTPUT_FLAG_VOIP_RX:
+            return media::AudioOutputFlags::VOIP_RX;
+        case AUDIO_OUTPUT_FLAG_INCALL_MUSIC:
+            return media::AudioOutputFlags::INCALL_MUSIC;
+        default:
+            return unexpected(BAD_VALUE);
+    }
+}
+
+ConversionResult<audio_input_flags_t> aidl2legacy_audio_input_flags_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, media::AudioInputFlags>(
+                    aidl, aidl2legacy_AudioInputFlags_audio_input_flags_t,
+                    index2enum_index<media::AudioInputFlags>,
+                    enumToMask_bitmask<LegacyMask, audio_input_flags_t>)));
+    return static_cast<audio_input_flags_t>(converted);
+}
+
+ConversionResult<int32_t> legacy2aidl_audio_input_flags_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, media::AudioInputFlags, audio_input_flags_t>(
+            legacyMask, legacy2aidl_audio_input_flags_t_AudioInputFlags,
+            index2enum_bitmask<audio_input_flags_t>,
+            enumToMask_index<int32_t, media::AudioInputFlags>);
+}
+
+ConversionResult<audio_output_flags_t> aidl2legacy_audio_output_flags_mask(int32_t aidl) {
+    using LegacyMask = std::underlying_type_t<audio_output_flags_t>;
+
+    LegacyMask converted = VALUE_OR_RETURN(
+            (convertBitmask<LegacyMask, int32_t, audio_output_flags_t, media::AudioOutputFlags>(
+                    aidl, aidl2legacy_AudioOutputFlags_audio_output_flags_t,
+                    index2enum_index<media::AudioOutputFlags>,
+                    enumToMask_bitmask<LegacyMask, audio_output_flags_t>)));
+    return convertReinterpret<audio_output_flags_t>(converted);
+}
+
+ConversionResult<int32_t> legacy2aidl_audio_output_flags_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, media::AudioOutputFlags, audio_output_flags_t>(
+            legacyMask, legacy2aidl_audio_output_flags_t_AudioOutputFlags,
+            index2enum_bitmask<audio_output_flags_t>,
+            enumToMask_index<int32_t, media::AudioOutputFlags>);
+}
+
+ConversionResult<audio_io_flags> aidl2legacy_AudioIoFlags_audio_io_flags(
+        const media::AudioIoFlags& aidl, media::AudioPortRole role, media::AudioPortType type) {
+    audio_io_flags legacy;
+    // Our way of representing a union in AIDL is to have multiple vectors and require that at most
+    // one of the them has size 1 and the rest are empty.
+    size_t totalSize = aidl.input.size() + aidl.output.size();
+    if (totalSize > 1) {
+        return unexpected(BAD_VALUE);
+    }
+
+    Direction dir = VALUE_OR_RETURN(direction(role, type));
+    switch (dir) {
+        case Direction::INPUT:
+            if (aidl.input.empty()) {
+                return unexpected(BAD_VALUE);
+            }
+            legacy.input = VALUE_OR_RETURN(aidl2legacy_audio_input_flags_mask(aidl.input[0]));
+            break;
+
+        case Direction::OUTPUT:
+            if (aidl.output.empty()) {
+                return unexpected(BAD_VALUE);
+            }
+            legacy.output = VALUE_OR_RETURN(aidl2legacy_audio_output_flags_mask(aidl.output[0]));
+            break;
+    }
+
+    return legacy;
+}
+
+ConversionResult<media::AudioIoFlags> legacy2aidl_audio_io_flags_AudioIoFlags(
+        const audio_io_flags& legacy, audio_port_role_t role, audio_port_type_t type) {
+    media::AudioIoFlags aidl;
+
+    Direction dir = VALUE_OR_RETURN(direction(role, type));
+    switch (dir) {
+        case Direction::INPUT:
+            aidl.input.push_back(VALUE_OR_RETURN(legacy2aidl_audio_input_flags_mask(legacy.input)));
+            break;
+        case Direction::OUTPUT:
+            aidl.output.push_back(
+                    VALUE_OR_RETURN(legacy2aidl_audio_output_flags_mask(legacy.output)));
+            break;
+    }
+    return aidl;
+}
+
+ConversionResult<audio_port_config_device_ext> aidl2legacy_AudioPortConfigDeviceExt(
+        const media::AudioPortConfigDeviceExt& aidl) {
+    audio_port_config_device_ext legacy;
+    legacy.hw_module = VALUE_OR_RETURN(convertReinterpret<audio_module_handle_t>(aidl.hwModule));
+    legacy.type = VALUE_OR_RETURN(aidl2legacy_int32_t_audio_devices_t(aidl.type));
+    if (aidl.address.size() > AUDIO_DEVICE_MAX_ADDRESS_LEN - 1) {
+        return unexpected(BAD_VALUE);
+    }
+    std::strcpy(legacy.address, aidl.address.c_str());
+    return legacy;
+}
+
+ConversionResult<media::AudioPortConfigDeviceExt> legacy2aidl_AudioPortConfigDeviceExt(
+        const audio_port_config_device_ext& legacy) {
+    media::AudioPortConfigDeviceExt aidl;
+    aidl.hwModule = VALUE_OR_RETURN(convertReinterpret<int32_t>(legacy.hw_module));
+    aidl.type = VALUE_OR_RETURN(legacy2aidl_audio_devices_t_int32_t(legacy.type));
+
+    if (strnlen(legacy.address, AUDIO_DEVICE_MAX_ADDRESS_LEN) == AUDIO_DEVICE_MAX_ADDRESS_LEN) {
+        // No null-terminator.
+        return unexpected(BAD_VALUE);
+    }
+    aidl.address = legacy.address;
+    return aidl;
+}
+
+ConversionResult<audio_stream_type_t> aidl2legacy_AudioStreamType_audio_stream_type_t(
+        media::AudioStreamType aidl) {
+    switch (aidl) {
+        case media::AudioStreamType::DEFAULT:
+            return AUDIO_STREAM_DEFAULT;
+        case media::AudioStreamType::VOICE_CALL:
+            return AUDIO_STREAM_VOICE_CALL;
+        case media::AudioStreamType::SYSTEM:
+            return AUDIO_STREAM_SYSTEM;
+        case media::AudioStreamType::RING:
+            return AUDIO_STREAM_RING;
+        case media::AudioStreamType::MUSIC:
+            return AUDIO_STREAM_MUSIC;
+        case media::AudioStreamType::ALARM:
+            return AUDIO_STREAM_ALARM;
+        case media::AudioStreamType::NOTIFICATION:
+            return AUDIO_STREAM_NOTIFICATION;
+        case media::AudioStreamType::BLUETOOTH_SCO:
+            return AUDIO_STREAM_BLUETOOTH_SCO;
+        case media::AudioStreamType::ENFORCED_AUDIBLE:
+            return AUDIO_STREAM_ENFORCED_AUDIBLE;
+        case media::AudioStreamType::DTMF:
+            return AUDIO_STREAM_DTMF;
+        case media::AudioStreamType::TTS:
+            return AUDIO_STREAM_TTS;
+        case media::AudioStreamType::ACCESSIBILITY:
+            return AUDIO_STREAM_ACCESSIBILITY;
+        case media::AudioStreamType::ASSISTANT:
+            return AUDIO_STREAM_ASSISTANT;
+        case media::AudioStreamType::REROUTING:
+            return AUDIO_STREAM_REROUTING;
+        case media::AudioStreamType::PATCH:
+            return AUDIO_STREAM_PATCH;
+        case media::AudioStreamType::CALL_ASSISTANT:
+            return AUDIO_STREAM_CALL_ASSISTANT;
+        default:
+            return unexpected(BAD_VALUE);
+    }
+}
+
+ConversionResult<media::AudioStreamType> legacy2aidl_audio_stream_type_t_AudioStreamType(
+        audio_stream_type_t legacy) {
+    switch (legacy) {
+        case AUDIO_STREAM_DEFAULT:
+            return media::AudioStreamType::DEFAULT;
+        case AUDIO_STREAM_VOICE_CALL:
+            return media::AudioStreamType::VOICE_CALL;
+        case AUDIO_STREAM_SYSTEM:
+            return media::AudioStreamType::SYSTEM;
+        case AUDIO_STREAM_RING:
+            return media::AudioStreamType::RING;
+        case AUDIO_STREAM_MUSIC:
+            return media::AudioStreamType::MUSIC;
+        case AUDIO_STREAM_ALARM:
+            return media::AudioStreamType::ALARM;
+        case AUDIO_STREAM_NOTIFICATION:
+            return media::AudioStreamType::NOTIFICATION;
+        case AUDIO_STREAM_BLUETOOTH_SCO:
+            return media::AudioStreamType::BLUETOOTH_SCO;
+        case AUDIO_STREAM_ENFORCED_AUDIBLE:
+            return media::AudioStreamType::ENFORCED_AUDIBLE;
+        case AUDIO_STREAM_DTMF:
+            return media::AudioStreamType::DTMF;
+        case AUDIO_STREAM_TTS:
+            return media::AudioStreamType::TTS;
+        case AUDIO_STREAM_ACCESSIBILITY:
+            return media::AudioStreamType::ACCESSIBILITY;
+        case AUDIO_STREAM_ASSISTANT:
+            return media::AudioStreamType::ASSISTANT;
+        case AUDIO_STREAM_REROUTING:
+            return media::AudioStreamType::REROUTING;
+        case AUDIO_STREAM_PATCH:
+            return media::AudioStreamType::PATCH;
+        case AUDIO_STREAM_CALL_ASSISTANT:
+            return media::AudioStreamType::CALL_ASSISTANT;
+        default:
+            return unexpected(BAD_VALUE);
+    }
+}
+
+ConversionResult<audio_source_t> aidl2legacy_AudioSourceType_audio_source_t(
+        media::AudioSourceType aidl) {
+    switch (aidl) {
+        case media::AudioSourceType::DEFAULT:
+            return AUDIO_SOURCE_DEFAULT;
+        case media::AudioSourceType::MIC:
+            return AUDIO_SOURCE_MIC;
+        case media::AudioSourceType::VOICE_UPLINK:
+            return AUDIO_SOURCE_VOICE_UPLINK;
+        case media::AudioSourceType::VOICE_DOWNLINK:
+            return AUDIO_SOURCE_VOICE_DOWNLINK;
+        case media::AudioSourceType::VOICE_CALL:
+            return AUDIO_SOURCE_VOICE_CALL;
+        case media::AudioSourceType::CAMCORDER:
+            return AUDIO_SOURCE_CAMCORDER;
+        case media::AudioSourceType::VOICE_RECOGNITION:
+            return AUDIO_SOURCE_VOICE_RECOGNITION;
+        case media::AudioSourceType::VOICE_COMMUNICATION:
+            return AUDIO_SOURCE_VOICE_COMMUNICATION;
+        case media::AudioSourceType::REMOTE_SUBMIX:
+            return AUDIO_SOURCE_REMOTE_SUBMIX;
+        case media::AudioSourceType::UNPROCESSED:
+            return AUDIO_SOURCE_UNPROCESSED;
+        case media::AudioSourceType::VOICE_PERFORMANCE:
+            return AUDIO_SOURCE_VOICE_PERFORMANCE;
+        case media::AudioSourceType::ECHO_REFERENCE:
+            return AUDIO_SOURCE_ECHO_REFERENCE;
+        case media::AudioSourceType::FM_TUNER:
+            return AUDIO_SOURCE_FM_TUNER;
+        case media::AudioSourceType::HOTWORD:
+            return AUDIO_SOURCE_HOTWORD;
+        default:
+            return unexpected(BAD_VALUE);
+    }
+}
+
+ConversionResult<media::AudioSourceType> legacy2aidl_audio_source_t_AudioSourceType(
+        audio_source_t legacy) {
+    switch (legacy) {
+        case AUDIO_SOURCE_DEFAULT:
+            return media::AudioSourceType::DEFAULT;
+        case AUDIO_SOURCE_MIC:
+            return media::AudioSourceType::MIC;
+        case AUDIO_SOURCE_VOICE_UPLINK:
+            return media::AudioSourceType::VOICE_UPLINK;
+        case AUDIO_SOURCE_VOICE_DOWNLINK:
+            return media::AudioSourceType::VOICE_DOWNLINK;
+        case AUDIO_SOURCE_VOICE_CALL:
+            return media::AudioSourceType::VOICE_CALL;
+        case AUDIO_SOURCE_CAMCORDER:
+            return media::AudioSourceType::CAMCORDER;
+        case AUDIO_SOURCE_VOICE_RECOGNITION:
+            return media::AudioSourceType::VOICE_RECOGNITION;
+        case AUDIO_SOURCE_VOICE_COMMUNICATION:
+            return media::AudioSourceType::VOICE_COMMUNICATION;
+        case AUDIO_SOURCE_REMOTE_SUBMIX:
+            return media::AudioSourceType::REMOTE_SUBMIX;
+        case AUDIO_SOURCE_UNPROCESSED:
+            return media::AudioSourceType::UNPROCESSED;
+        case AUDIO_SOURCE_VOICE_PERFORMANCE:
+            return media::AudioSourceType::VOICE_PERFORMANCE;
+        case AUDIO_SOURCE_ECHO_REFERENCE:
+            return media::AudioSourceType::ECHO_REFERENCE;
+        case AUDIO_SOURCE_FM_TUNER:
+            return media::AudioSourceType::FM_TUNER;
+        case AUDIO_SOURCE_HOTWORD:
+            return media::AudioSourceType::HOTWORD;
+        default:
+            return unexpected(BAD_VALUE);
+    }
+}
+
+ConversionResult<audio_session_t> aidl2legacy_AudioSessionType_audio_session_t(
+        media::AudioSessionType aidl) {
+    switch (aidl) {
+        case media::AudioSessionType::DEVICE:
+            return AUDIO_SESSION_DEVICE;
+        case media::AudioSessionType::OUTPUT_STAGE:
+            return AUDIO_SESSION_OUTPUT_STAGE;
+        case media::AudioSessionType::OUTPUT_MIX:
+            return AUDIO_SESSION_OUTPUT_MIX;
+        default:
+            return unexpected(BAD_VALUE);
+    }
+}
+
+ConversionResult<media::AudioSessionType> legacy2aidl_audio_session_t_AudioSessionType(
+        audio_session_t legacy) {
+    switch (legacy) {
+        case AUDIO_SESSION_DEVICE:
+            return media::AudioSessionType::DEVICE;
+        case AUDIO_SESSION_OUTPUT_STAGE:
+            return media::AudioSessionType::OUTPUT_STAGE;
+        case AUDIO_SESSION_OUTPUT_MIX:
+            return media::AudioSessionType::OUTPUT_MIX;
+        default:
+            return unexpected(BAD_VALUE);
+    }
+}
+
+// This type is unnamed in the original definition, thus we name it here.
+using audio_port_config_mix_ext_usecase = decltype(audio_port_config_mix_ext::usecase);
+
+ConversionResult<audio_port_config_mix_ext_usecase> aidl2legacy_AudioPortConfigMixExtUseCase(
+        const media::AudioPortConfigMixExtUseCase& aidl, media::AudioPortRole role) {
+    audio_port_config_mix_ext_usecase legacy;
+
+    // Our way of representing a union in AIDL is to have multiple vectors and require that exactly
+    // one of the them has size 1 and the rest are empty.
+    size_t totalSize = aidl.stream.size() + aidl.source.size();
+    if (totalSize > 1) {
+        return unexpected(BAD_VALUE);
+    }
+
+    switch (role) {
+        case media::AudioPortRole::NONE:
+            if (totalSize != 0) {
+                return unexpected(BAD_VALUE);
+            }
+            break;
+
+        case media::AudioPortRole::SOURCE:
+            // This is not a bug. A SOURCE role corresponds to the stream field.
+            if (aidl.stream.empty()) {
+                return unexpected(BAD_VALUE);
+            }
+            legacy.stream = VALUE_OR_RETURN(
+                    aidl2legacy_AudioStreamType_audio_stream_type_t(aidl.stream[0]));
+            break;
+
+        case media::AudioPortRole::SINK:
+            // This is not a bug. A SINK role corresponds to the source field.
+            if (aidl.source.empty()) {
+                return unexpected(BAD_VALUE);
+            }
+            legacy.source =
+                    VALUE_OR_RETURN(aidl2legacy_AudioSourceType_audio_source_t(aidl.source[0]));
+            break;
+
+        default:
+            LOG_ALWAYS_FATAL("Shouldn't get here");
+    }
+    return legacy;
+}
+
+ConversionResult<media::AudioPortConfigMixExtUseCase> legacy2aidl_AudioPortConfigMixExtUseCase(
+        const audio_port_config_mix_ext_usecase& legacy, audio_port_role_t role) {
+    media::AudioPortConfigMixExtUseCase aidl;
+
+    switch (role) {
+        case AUDIO_PORT_ROLE_NONE:
+            break;
+        case AUDIO_PORT_ROLE_SOURCE:
+            // This is not a bug. A SOURCE role corresponds to the stream field.
+            aidl.stream.push_back(VALUE_OR_RETURN(
+                                          legacy2aidl_audio_stream_type_t_AudioStreamType(
+                                                  legacy.stream)));
+            break;
+        case AUDIO_PORT_ROLE_SINK:
+            // This is not a bug. A SINK role corresponds to the source field.
+            aidl.source.push_back(
+                    VALUE_OR_RETURN(legacy2aidl_audio_source_t_AudioSourceType(legacy.source)));
+            break;
+        default:
+            LOG_ALWAYS_FATAL("Shouldn't get here");
+    }
+    return aidl;
+}
+
+ConversionResult<audio_port_config_mix_ext> aidl2legacy_AudioPortConfigMixExt(
+        const media::AudioPortConfigMixExt& aidl, media::AudioPortRole role) {
+    audio_port_config_mix_ext legacy;
+    legacy.hw_module = VALUE_OR_RETURN(convertReinterpret<audio_module_handle_t>(aidl.hwModule));
+    legacy.handle = VALUE_OR_RETURN(convertReinterpret<audio_io_handle_t>(aidl.handle));
+    legacy.usecase = VALUE_OR_RETURN(aidl2legacy_AudioPortConfigMixExtUseCase(aidl.usecase, role));
+    return legacy;
+}
+
+ConversionResult<media::AudioPortConfigMixExt> legacy2aidl_AudioPortConfigMixExt(
+        const audio_port_config_mix_ext& legacy, audio_port_role_t role) {
+    media::AudioPortConfigMixExt aidl;
+    aidl.hwModule = VALUE_OR_RETURN(convertReinterpret<int32_t>(legacy.hw_module));
+    aidl.handle = VALUE_OR_RETURN(convertReinterpret<int32_t>(legacy.handle));
+    aidl.usecase = VALUE_OR_RETURN(legacy2aidl_AudioPortConfigMixExtUseCase(legacy.usecase, role));
+    return aidl;
+}
+
+ConversionResult<audio_port_config_session_ext> aidl2legacy_AudioPortConfigSessionExt(
+        const media::AudioPortConfigSessionExt& aidl) {
+    audio_port_config_session_ext legacy;
+    legacy.session = VALUE_OR_RETURN(aidl2legacy_AudioSessionType_audio_session_t(aidl.session));
+    return legacy;
+}
+
+ConversionResult<media::AudioPortConfigSessionExt> legacy2aidl_AudioPortConfigSessionExt(
+        const audio_port_config_session_ext& legacy) {
+    media::AudioPortConfigSessionExt aidl;
+    aidl.session = VALUE_OR_RETURN(legacy2aidl_audio_session_t_AudioSessionType(legacy.session));
+    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);
+
+ConversionResult<audio_port_config_ext> aidl2legacy_AudioPortConfigExt(
+        const media::AudioPortConfigExt& aidl, media::AudioPortType type,
+        media::AudioPortRole role) {
+    audio_port_config_ext legacy;
+    // Our way of representing a union in AIDL is to have multiple vectors and require that at most
+    // one of the them has size 1 and the rest are empty.
+    size_t totalSize = aidl.device.size() + aidl.mix.size() + aidl.session.size();
+    if (totalSize > 1) {
+        return unexpected(BAD_VALUE);
+    }
+    switch (type) {
+        case media::AudioPortType::NONE:
+            if (totalSize != 0) {
+                return unexpected(BAD_VALUE);
+            }
+            break;
+        case media::AudioPortType::DEVICE:
+            if (aidl.device.empty()) {
+                return unexpected(BAD_VALUE);
+            }
+            legacy.device = VALUE_OR_RETURN(aidl2legacy_AudioPortConfigDeviceExt(aidl.device[0]));
+            break;
+        case media::AudioPortType::MIX:
+            if (aidl.mix.empty()) {
+                return unexpected(BAD_VALUE);
+            }
+            legacy.mix = VALUE_OR_RETURN(aidl2legacy_AudioPortConfigMixExt(aidl.mix[0], role));
+            break;
+        case media::AudioPortType::SESSION:
+            if (aidl.session.empty()) {
+                return unexpected(BAD_VALUE);
+            }
+            legacy.session =
+                    VALUE_OR_RETURN(aidl2legacy_AudioPortConfigSessionExt(aidl.session[0]));
+            break;
+        default:
+            LOG_ALWAYS_FATAL("Shouldn't get here");
+    }
+    return legacy;
+}
+
+ConversionResult<media::AudioPortConfigExt> legacy2aidl_AudioPortConfigExt(
+        const audio_port_config_ext& legacy, audio_port_type_t type, audio_port_role_t role) {
+    media::AudioPortConfigExt aidl;
+
+    switch (type) {
+        case AUDIO_PORT_TYPE_NONE:
+            break;
+        case AUDIO_PORT_TYPE_DEVICE:
+            aidl.device.push_back(
+                    VALUE_OR_RETURN(legacy2aidl_AudioPortConfigDeviceExt(legacy.device)));
+            break;
+        case AUDIO_PORT_TYPE_MIX:
+            aidl.mix.push_back(
+                    VALUE_OR_RETURN(legacy2aidl_AudioPortConfigMixExt(legacy.mix, role)));
+            break;
+        case AUDIO_PORT_TYPE_SESSION:
+            aidl.session.push_back(
+                    VALUE_OR_RETURN(legacy2aidl_AudioPortConfigSessionExt(legacy.session)));
+            break;
+        default:
+            LOG_ALWAYS_FATAL("Shouldn't get here");
+    }
+    return aidl;
+}
+
+ConversionResult<audio_port_config> aidl2legacy_AudioPortConfig_audio_port_config(
+        const media::AudioPortConfig& aidl) {
+    audio_port_config legacy;
+    legacy.id = VALUE_OR_RETURN(convertReinterpret<audio_port_handle_t>(aidl.id));
+    legacy.role = VALUE_OR_RETURN(aidl2legacy_AudioPortRole_audio_port_role_t(aidl.role));
+    legacy.type = VALUE_OR_RETURN(aidl2legacy_AudioPortType_audio_port_type_t(aidl.type));
+    legacy.config_mask = VALUE_OR_RETURN(aidl2legacy_int32_t_config_mask(aidl.configMask));
+    if (bitmaskIsSet(aidl.configMask, media::AudioPortConfigType::SAMPLE_RATE)) {
+        legacy.sample_rate = VALUE_OR_RETURN(convertIntegral<unsigned int>(aidl.sampleRate));
+    }
+    if (bitmaskIsSet(aidl.configMask, media::AudioPortConfigType::CHANNEL_MASK)) {
+        legacy.channel_mask =
+                VALUE_OR_RETURN(aidl2legacy_int32_t_audio_channel_mask_t(aidl.channelMask));
+    }
+    if (bitmaskIsSet(aidl.configMask, media::AudioPortConfigType::FORMAT)) {
+        legacy.format = VALUE_OR_RETURN(aidl2legacy_AudioFormat_audio_format_t(aidl.format));
+    }
+    if (bitmaskIsSet(aidl.configMask, media::AudioPortConfigType::GAIN)) {
+        legacy.gain = VALUE_OR_RETURN(
+                aidl2legacy_AudioGainConfig_audio_gain_config(aidl.gain, aidl.role, aidl.type));
+    }
+    if (bitmaskIsSet(aidl.configMask, media::AudioPortConfigType::FLAGS)) {
+        legacy.flags = VALUE_OR_RETURN(
+                aidl2legacy_AudioIoFlags_audio_io_flags(aidl.flags, aidl.role, aidl.type));
+    }
+    legacy.ext = VALUE_OR_RETURN(aidl2legacy_AudioPortConfigExt(aidl.ext, aidl.type, aidl.role));
+    return legacy;
+}
+
+ConversionResult<media::AudioPortConfig> legacy2aidl_audio_port_config_AudioPortConfig(
+        const audio_port_config& legacy) {
+    media::AudioPortConfig aidl;
+    aidl.id = VALUE_OR_RETURN(convertReinterpret<audio_port_handle_t>(legacy.id));
+    aidl.role = VALUE_OR_RETURN(legacy2aidl_audio_port_role_t_AudioPortRole(legacy.role));
+    aidl.type = VALUE_OR_RETURN(legacy2aidl_audio_port_type_t_AudioPortType(legacy.type));
+    aidl.configMask = VALUE_OR_RETURN(legacy2aidl_config_mask_int32_t(legacy.config_mask));
+    if (legacy.config_mask & AUDIO_PORT_CONFIG_SAMPLE_RATE) {
+        aidl.sampleRate = VALUE_OR_RETURN(convertIntegral<int32_t>(legacy.sample_rate));
+    }
+    if (legacy.config_mask & AUDIO_PORT_CONFIG_CHANNEL_MASK) {
+        aidl.channelMask =
+                VALUE_OR_RETURN(legacy2aidl_audio_channel_mask_t_int32_t(legacy.channel_mask));
+    }
+    if (legacy.config_mask & AUDIO_PORT_CONFIG_FORMAT) {
+        aidl.format = VALUE_OR_RETURN(legacy2aidl_audio_format_t_AudioFormat(legacy.format));
+    }
+    if (legacy.config_mask & AUDIO_PORT_CONFIG_GAIN) {
+        aidl.gain = VALUE_OR_RETURN(legacy2aidl_audio_gain_config_AudioGainConfig(
+                legacy.gain, legacy.role, legacy.type));
+    }
+    if (legacy.config_mask & AUDIO_PORT_CONFIG_FLAGS) {
+        aidl.flags = VALUE_OR_RETURN(
+                legacy2aidl_audio_io_flags_AudioIoFlags(legacy.flags, legacy.role, legacy.type));
+    }
+    aidl.ext =
+            VALUE_OR_RETURN(legacy2aidl_AudioPortConfigExt(legacy.ext, legacy.type, legacy.role));
+    return aidl;
+}
+
+ConversionResult<struct audio_patch> aidl2legacy_AudioPatch_audio_patch(
+        const media::AudioPatch& aidl) {
+    struct audio_patch legacy;
+    legacy.id = VALUE_OR_RETURN(convertReinterpret<audio_patch_handle_t>(aidl.id));
+    legacy.num_sinks = VALUE_OR_RETURN(convertIntegral<unsigned int>(aidl.sinks.size()));
+    if (legacy.num_sinks > AUDIO_PATCH_PORTS_MAX) {
+        return unexpected(BAD_VALUE);
+    }
+    for (size_t i = 0; i < legacy.num_sinks; ++i) {
+        legacy.sinks[i] =
+                VALUE_OR_RETURN(aidl2legacy_AudioPortConfig_audio_port_config(aidl.sinks[i]));
+    }
+    legacy.num_sources = VALUE_OR_RETURN(convertIntegral<unsigned int>(aidl.sources.size()));
+    if (legacy.num_sources > AUDIO_PATCH_PORTS_MAX) {
+        return unexpected(BAD_VALUE);
+    }
+    for (size_t i = 0; i < legacy.num_sources; ++i) {
+        legacy.sources[i] =
+                VALUE_OR_RETURN(aidl2legacy_AudioPortConfig_audio_port_config(aidl.sources[i]));
+    }
+    return legacy;
+}
+
+ConversionResult<media::AudioPatch> legacy2aidl_audio_patch_AudioPatch(
+        const struct audio_patch& legacy) {
+    media::AudioPatch aidl;
+    aidl.id = VALUE_OR_RETURN(convertReinterpret<int32_t>(legacy.id));
+
+    if (legacy.num_sinks > AUDIO_PATCH_PORTS_MAX) {
+        return unexpected(BAD_VALUE);
+    }
+    for (unsigned int i = 0; i < legacy.num_sinks; ++i) {
+        aidl.sinks.push_back(
+                VALUE_OR_RETURN(legacy2aidl_audio_port_config_AudioPortConfig(legacy.sinks[i])));
+    }
+    if (legacy.num_sources > AUDIO_PATCH_PORTS_MAX) {
+        return unexpected(BAD_VALUE);
+    }
+    for (unsigned int i = 0; i < legacy.num_sources; ++i) {
+        aidl.sources.push_back(
+                VALUE_OR_RETURN(legacy2aidl_audio_port_config_AudioPortConfig(legacy.sources[i])));
+    }
+    return aidl;
+}
+
+ConversionResult<sp<AudioIoDescriptor>> aidl2legacy_AudioIoDescriptor_AudioIoDescriptor(
+        const media::AudioIoDescriptor& aidl) {
+    sp<AudioIoDescriptor> legacy(new AudioIoDescriptor());
+    legacy->mIoHandle = VALUE_OR_RETURN(convertReinterpret<audio_io_handle_t>(aidl.ioHandle));
+    legacy->mPatch = VALUE_OR_RETURN(aidl2legacy_AudioPatch_audio_patch(aidl.patch));
+    legacy->mSamplingRate = VALUE_OR_RETURN(convertIntegral<uint32_t>(aidl.samplingRate));
+    legacy->mFormat = VALUE_OR_RETURN(aidl2legacy_AudioFormat_audio_format_t(aidl.format));
+    legacy->mChannelMask =
+            VALUE_OR_RETURN(aidl2legacy_int32_t_audio_channel_mask_t(aidl.channelMask));
+    legacy->mFrameCount = VALUE_OR_RETURN(convertIntegral<size_t>(aidl.frameCount));
+    legacy->mFrameCountHAL = VALUE_OR_RETURN(convertIntegral<size_t>(aidl.frameCountHAL));
+    legacy->mLatency = VALUE_OR_RETURN(convertIntegral<uint32_t>(aidl.latency));
+    legacy->mPortId = VALUE_OR_RETURN(convertReinterpret<audio_port_handle_t>(aidl.portId));
+    return legacy;
+}
+
+ConversionResult<media::AudioIoDescriptor> legacy2aidl_AudioIoDescriptor_AudioIoDescriptor(
+        const sp<AudioIoDescriptor>& legacy) {
+    media::AudioIoDescriptor aidl;
+    aidl.ioHandle = VALUE_OR_RETURN(convertReinterpret<int32_t>(legacy->mIoHandle));
+    aidl.patch = VALUE_OR_RETURN(legacy2aidl_audio_patch_AudioPatch(legacy->mPatch));
+    aidl.samplingRate = VALUE_OR_RETURN(convertIntegral<int32_t>(legacy->mSamplingRate));
+    aidl.format = VALUE_OR_RETURN(legacy2aidl_audio_format_t_AudioFormat(legacy->mFormat));
+    aidl.channelMask = VALUE_OR_RETURN(convertReinterpret<int32_t>(legacy->mChannelMask));
+    aidl.frameCount = VALUE_OR_RETURN(convertIntegral<int64_t>(legacy->mFrameCount));
+    aidl.frameCountHAL = VALUE_OR_RETURN(convertIntegral<int64_t>(legacy->mFrameCountHAL));
+    aidl.latency = VALUE_OR_RETURN(convertIntegral<int32_t>(legacy->mLatency));
+    aidl.portId = VALUE_OR_RETURN(convertReinterpret<int32_t>(legacy->mPortId));
+    return aidl;
+}
+
+}  // namespace android
diff --git a/media/libaudioclient/Android.bp b/media/libaudioclient/Android.bp
index d7e9461..fef0ca9 100644
--- a/media/libaudioclient/Android.bp
+++ b/media/libaudioclient/Android.bp
@@ -2,6 +2,7 @@
     name: "libaudioclient_headers",
     vendor_available: true,
     min_sdk_version: "29",
+    host_supported: true,
 
     header_libs: [
         "libaudiofoundation_headers",
@@ -12,7 +13,12 @@
     export_header_lib_headers: [
         "libaudiofoundation_headers",
     ],
-    host_supported: true,
+    static_libs: [
+        "audioflinger-aidl-unstable-cpp",
+    ],
+    export_static_lib_headers: [
+        "audioflinger-aidl-unstable-cpp",
+    ],
     target: {
         darwin: {
             enabled: false,
@@ -29,6 +35,7 @@
         "AudioVolumeGroup.cpp",
     ],
     shared_libs: [
+        "audioflinger-aidl-unstable-cpp",
         "capture_state_listener-aidl-cpp",
         "libaudiofoundation",
         "libaudioutils",
@@ -44,6 +51,7 @@
     include_dirs: ["system/media/audio_utils/include"],
     export_include_dirs: ["include"],
     export_shared_lib_headers: [
+        "audioflinger-aidl-unstable-cpp",
         "capture_state_listener-aidl-cpp",
     ],
 }
@@ -73,7 +81,6 @@
         "AudioTrack.cpp",
         "AudioTrackShared.cpp",
         "IAudioFlinger.cpp",
-        "IAudioFlingerClient.cpp",
         "IAudioPolicyService.cpp",
         "IAudioPolicyServiceClient.cpp",
         "IAudioTrack.cpp",
@@ -83,7 +90,9 @@
         "TrackPlayerBase.cpp",
     ],
     shared_libs: [
+        "audioflinger-aidl-unstable-cpp",
         "capture_state_listener-aidl-cpp",
+        "libaudioclient_aidl_conversion",
         "libaudiofoundation",
         "libaudioutils",
         "libaudiopolicy",
@@ -101,7 +110,10 @@
         "libutils",
         "libvibrator",
     ],
-    export_shared_lib_headers: ["libbinder"],
+    export_shared_lib_headers: [
+        "audioflinger-aidl-unstable-cpp",
+        "libbinder",
+    ],
 
     include_dirs: [
         "frameworks/av/media/libnbaio/include_mono/",
@@ -140,6 +152,32 @@
     },
 }
 
+cc_library_shared {
+    name: "libaudioclient_aidl_conversion",
+    srcs: ["AidlConversion.cpp"],
+    local_include_dirs: ["include"],
+    shared_libs: [
+        "audioclient-types-aidl-unstable-cpp",
+        "libbase",
+        "liblog",
+        "libutils",
+    ],
+    export_shared_lib_headers: [
+        "audioclient-types-aidl-unstable-cpp",
+    ],
+    cflags: [
+        "-Wall",
+        "-Werror",
+        "-Wno-error=deprecated-declarations",
+    ],
+    sanitize: {
+        misc_undefined: [
+            "unsigned-integer-overflow",
+            "signed-integer-overflow",
+        ],
+    },
+}
+
 // AIDL interface between libaudioclient and framework.jar
 filegroup {
     name: "libaudioclient_aidl",
@@ -189,3 +227,61 @@
         "shared-file-region-aidl",
     ],
 }
+
+aidl_interface {
+    name: "audioclient-types-aidl",
+    unstable: true,
+    host_supported: true,
+    vendor_available: true,
+    double_loadable: true,
+    local_include_dir: "aidl",
+    srcs: [
+        "aidl/android/media/AudioGainConfig.aidl",
+        "aidl/android/media/AudioGainMode.aidl",
+        "aidl/android/media/AudioInputFlags.aidl",
+        "aidl/android/media/AudioIoConfigEvent.aidl",
+        "aidl/android/media/AudioIoDescriptor.aidl",
+        "aidl/android/media/AudioIoFlags.aidl",
+        "aidl/android/media/AudioOutputFlags.aidl",
+        "aidl/android/media/AudioPatch.aidl",
+        "aidl/android/media/AudioPortConfig.aidl",
+        "aidl/android/media/AudioPortConfigType.aidl",
+        "aidl/android/media/AudioPortConfigDeviceExt.aidl",
+        "aidl/android/media/AudioPortConfigExt.aidl",
+        "aidl/android/media/AudioPortConfigMixExt.aidl",
+        "aidl/android/media/AudioPortConfigMixExtUseCase.aidl",
+        "aidl/android/media/AudioPortConfigSessionExt.aidl",
+        "aidl/android/media/AudioPortRole.aidl",
+        "aidl/android/media/AudioPortType.aidl",
+        "aidl/android/media/AudioSessionType.aidl",
+        "aidl/android/media/AudioSourceType.aidl",
+        "aidl/android/media/AudioStreamType.aidl",
+    ],
+    imports: [
+        "audio_common-aidl",
+    ],
+}
+
+aidl_interface {
+    name: "audioflinger-aidl",
+    unstable: true,
+    local_include_dir: "aidl",
+    host_supported: true,
+    vendor_available: true,
+    srcs: [
+        "aidl/android/media/IAudioFlingerClient.aidl",
+    ],
+    imports: [
+        "audioclient-types-aidl",
+    ],
+    double_loadable: true,
+    backend: {
+        cpp: {
+            min_sdk_version: "29",
+            apex_available: [
+                "//apex_available:platform",
+                "com.android.media",
+            ],
+        },
+    },
+}
diff --git a/media/libaudioclient/AudioSystem.cpp b/media/libaudioclient/AudioSystem.cpp
index edb0889..0507879 100644
--- a/media/libaudioclient/AudioSystem.cpp
+++ b/media/libaudioclient/AudioSystem.cpp
@@ -23,6 +23,7 @@
 #include <binder/IServiceManager.h>
 #include <binder/ProcessState.h>
 #include <binder/IPCThreadState.h>
+#include <media/AidlConversion.h>
 #include <media/AudioResamplerPublic.h>
 #include <media/AudioSystem.h>
 #include <media/IAudioFlinger.h>
@@ -32,10 +33,17 @@
 
 #include <system/audio.h>
 
+#define VALUE_OR_RETURN(x) \
+    ({ auto _tmp = (x); \
+       if (!_tmp.ok()) return Status::fromStatusT(_tmp.error()); \
+       _tmp.value(); })
+
 // ----------------------------------------------------------------------------
 
 namespace android {
 
+using binder::Status;
+
 // client singleton for AudioFlinger binder interface
 Mutex AudioSystem::gLock;
 Mutex AudioSystem::gLockErrorCallbacks;
@@ -521,11 +529,17 @@
     ALOGW("AudioFlinger server died!");
 }
 
-void AudioSystem::AudioFlingerClient::ioConfigChanged(audio_io_config_event event,
-                                                      const sp<AudioIoDescriptor>& ioDesc) {
+Status AudioSystem::AudioFlingerClient::ioConfigChanged(
+        media::AudioIoConfigEvent _event,
+        const media::AudioIoDescriptor& _ioDesc) {
+    audio_io_config_event event = VALUE_OR_RETURN(
+            aidl2legacy_AudioIoConfigEvent_audio_io_config_event(_event));
+    sp<AudioIoDescriptor> ioDesc(
+            VALUE_OR_RETURN(aidl2legacy_AudioIoDescriptor_AudioIoDescriptor(_ioDesc)));
+
     ALOGV("ioConfigChanged() event %d", event);
 
-    if (ioDesc == 0 || ioDesc->mIoHandle == AUDIO_IO_HANDLE_NONE) return;
+    if (ioDesc->mIoHandle == AUDIO_IO_HANDLE_NONE) return Status::ok();
 
     audio_port_handle_t deviceId = AUDIO_PORT_HANDLE_NONE;
     std::vector<sp<AudioDeviceCallback>> callbacksToCall;
@@ -640,6 +654,8 @@
         // If callbacksToCall is not empty, it implies ioDesc->mIoHandle and deviceId are valid
         cb->onAudioDeviceUpdate(ioDesc->mIoHandle, deviceId);
     }
+
+    return Status::ok();
 }
 
 status_t AudioSystem::AudioFlingerClient::getInputBufferSize(
diff --git a/media/libaudioclient/IAudioFlinger.cpp b/media/libaudioclient/IAudioFlinger.cpp
index 7c304a1..d86182e 100644
--- a/media/libaudioclient/IAudioFlinger.cpp
+++ b/media/libaudioclient/IAudioFlinger.cpp
@@ -373,7 +373,7 @@
         return reply.readString8();
     }
 
-    virtual void registerClient(const sp<IAudioFlingerClient>& client)
+    virtual void registerClient(const sp<media::IAudioFlingerClient>& client)
     {
         Parcel data, reply;
         data.writeInterfaceToken(IAudioFlinger::getInterfaceDescriptor());
@@ -1213,7 +1213,7 @@
 
         case REGISTER_CLIENT: {
             CHECK_INTERFACE(IAudioFlinger, data, reply);
-            sp<IAudioFlingerClient> client = interface_cast<IAudioFlingerClient>(
+            sp<media::IAudioFlingerClient> client = interface_cast<media::IAudioFlingerClient>(
                     data.readStrongBinder());
             registerClient(client);
             return NO_ERROR;
diff --git a/media/libaudioclient/IAudioFlingerClient.cpp b/media/libaudioclient/IAudioFlingerClient.cpp
deleted file mode 100644
index 47eb7dc..0000000
--- a/media/libaudioclient/IAudioFlingerClient.cpp
+++ /dev/null
@@ -1,91 +0,0 @@
-/*
- * Copyright (C) 2009 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.
- */
-
-#define LOG_TAG "IAudioFlingerClient"
-#include <utils/Log.h>
-
-#include <stdint.h>
-#include <sys/types.h>
-
-#include <binder/Parcel.h>
-
-#include <media/IAudioFlingerClient.h>
-#include <media/AudioSystem.h>
-
-namespace android {
-
-enum {
-    IO_CONFIG_CHANGED = IBinder::FIRST_CALL_TRANSACTION
-};
-
-class BpAudioFlingerClient : public BpInterface<IAudioFlingerClient>
-{
-public:
-    explicit BpAudioFlingerClient(const sp<IBinder>& impl)
-        : BpInterface<IAudioFlingerClient>(impl)
-    {
-    }
-
-    void ioConfigChanged(audio_io_config_event event, const sp<AudioIoDescriptor>& ioDesc)
-    {
-        Parcel data, reply;
-        data.writeInterfaceToken(IAudioFlingerClient::getInterfaceDescriptor());
-        data.writeInt32(event);
-        data.writeInt32((int32_t)ioDesc->mIoHandle);
-        data.write(&ioDesc->mPatch, sizeof(struct audio_patch));
-        data.writeInt32(ioDesc->mSamplingRate);
-        data.writeInt32(ioDesc->mFormat);
-        data.writeInt32(ioDesc->mChannelMask);
-        data.writeInt64(ioDesc->mFrameCount);
-        data.writeInt64(ioDesc->mFrameCountHAL);
-        data.writeInt32(ioDesc->mLatency);
-        data.writeInt32(ioDesc->mPortId);
-        remote()->transact(IO_CONFIG_CHANGED, data, &reply, IBinder::FLAG_ONEWAY);
-    }
-};
-
-IMPLEMENT_META_INTERFACE(AudioFlingerClient, "android.media.IAudioFlingerClient");
-
-// ----------------------------------------------------------------------
-
-status_t BnAudioFlingerClient::onTransact(
-    uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
-{
-    switch (code) {
-    case IO_CONFIG_CHANGED: {
-            CHECK_INTERFACE(IAudioFlingerClient, data, reply);
-            audio_io_config_event event = (audio_io_config_event)data.readInt32();
-            sp<AudioIoDescriptor> ioDesc = new AudioIoDescriptor();
-            ioDesc->mIoHandle = (audio_io_handle_t) data.readInt32();
-            data.read(&ioDesc->mPatch, sizeof(struct audio_patch));
-            ioDesc->mSamplingRate = data.readInt32();
-            ioDesc->mFormat = (audio_format_t) data.readInt32();
-            ioDesc->mChannelMask = (audio_channel_mask_t) data.readInt32();
-            ioDesc->mFrameCount = data.readInt64();
-            ioDesc->mFrameCountHAL = data.readInt64();
-            ioDesc->mLatency = data.readInt32();
-            ioDesc->mPortId = data.readInt32();
-            ioConfigChanged(event, ioDesc);
-            return NO_ERROR;
-        } break;
-        default:
-            return BBinder::onTransact(code, data, reply, flags);
-    }
-}
-
-// ----------------------------------------------------------------------------
-
-} // namespace android
diff --git a/media/libaudioclient/aidl/android/media/AudioGainConfig.aidl b/media/libaudioclient/aidl/android/media/AudioGainConfig.aidl
new file mode 100644
index 0000000..b93c2dc
--- /dev/null
+++ b/media/libaudioclient/aidl/android/media/AudioGainConfig.aidl
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.media;
+
+/**
+ * {@hide}
+ */
+parcelable AudioGainConfig {
+    /** Index of the corresponding audio_gain in the audio_port gains[] table. */
+    int index;
+
+    /** Mode requested for this command. Bitfield indexed by AudioGainMode. */
+    int mode;
+
+    /**
+     * Channels which gain value follows. N/A in joint mode.
+     * Interpreted as audio_channel_mask_t.
+     */
+    int channelMask;
+
+    /**
+     * Gain values in millibels.
+     * For each channel ordered from LSb to MSb in channel mask. The number of values is 1 in joint
+     * mode, otherwise equals the number of bits implied by channelMask.
+     */
+    int[]  values;
+
+    /** Ramp duration in ms. */
+    int rampDurationMs;
+}
diff --git a/media/libaudioclient/aidl/android/media/AudioGainMode.aidl b/media/libaudioclient/aidl/android/media/AudioGainMode.aidl
new file mode 100644
index 0000000..39395e5
--- /dev/null
+++ b/media/libaudioclient/aidl/android/media/AudioGainMode.aidl
@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package android.media;
+
+@Backing(type="int")
+enum AudioGainMode {
+    JOINT    = 0,
+    CHANNELS = 1,
+    RAMP     = 2,
+}
diff --git a/media/libaudioclient/aidl/android/media/AudioInputFlags.aidl b/media/libaudioclient/aidl/android/media/AudioInputFlags.aidl
new file mode 100644
index 0000000..8f517e7
--- /dev/null
+++ b/media/libaudioclient/aidl/android/media/AudioInputFlags.aidl
@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package android.media;
+
+@Backing(type="int")
+enum AudioInputFlags {
+    FAST       = 0,
+    HW_HOTWORD = 1,
+    RAW        = 2,
+    SYNC       = 3,
+    MMAP_NOIRQ = 4,
+    VOIP_TX    = 5,
+    HW_AV_SYNC = 6,
+    DIRECT     = 7,
+}
diff --git a/media/libaudioclient/aidl/android/media/AudioIoConfigEvent.aidl b/media/libaudioclient/aidl/android/media/AudioIoConfigEvent.aidl
new file mode 100644
index 0000000..d5f23a1
--- /dev/null
+++ b/media/libaudioclient/aidl/android/media/AudioIoConfigEvent.aidl
@@ -0,0 +1,33 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.media;
+
+/**
+ * {@hide}
+ */
+@Backing(type="int")
+enum AudioIoConfigEvent {
+    OUTPUT_REGISTERED = 0,
+    OUTPUT_OPENED = 1,
+    OUTPUT_CLOSED = 2,
+    OUTPUT_CONFIG_CHANGED = 3,
+    INPUT_REGISTERED = 4,
+    INPUT_OPENED = 5,
+    INPUT_CLOSED = 6,
+    INPUT_CONFIG_CHANGED = 7,
+    CLIENT_STARTED = 8,
+}
diff --git a/media/libaudioclient/aidl/android/media/AudioIoDescriptor.aidl b/media/libaudioclient/aidl/android/media/AudioIoDescriptor.aidl
new file mode 100644
index 0000000..876ef9b
--- /dev/null
+++ b/media/libaudioclient/aidl/android/media/AudioIoDescriptor.aidl
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.media;
+
+import android.media.AudioPatch;
+import android.media.audio.common.AudioFormat;
+
+/**
+ * {@hide}
+ */
+parcelable AudioIoDescriptor {
+    /** Interpreted as audio_io_handle_t. */
+    int ioHandle;
+    AudioPatch patch;
+    int samplingRate;
+    AudioFormat format;
+    /** Interpreted as audio_channel_mask_t. */
+    int channelMask;
+    long frameCount;
+    long frameCountHAL;
+    /** Only valid for output. */
+    int latency;
+    /**
+     * Interpreted as audio_port_handle_t.
+     * valid for event AUDIO_CLIENT_STARTED.
+     */
+    int portId;
+}
diff --git a/media/libaudioclient/aidl/android/media/AudioIoFlags.aidl b/media/libaudioclient/aidl/android/media/AudioIoFlags.aidl
new file mode 100644
index 0000000..1fe2acc
--- /dev/null
+++ b/media/libaudioclient/aidl/android/media/AudioIoFlags.aidl
@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.media;
+
+/**
+ * {@hide}
+ */
+// TODO(b/150948558): This should be a union. In the meantime, we require
+// that exactly one of the below arrays has a single element and the rest
+// are empty.
+parcelable AudioIoFlags {
+    /** Bitmask indexed by AudioInputFlags. */
+    int[] input;
+    /** Bitmask indexed by AudioOutputFlags. */
+    int[] output;
+}
diff --git a/media/libaudioclient/aidl/android/media/AudioOutputFlags.aidl b/media/libaudioclient/aidl/android/media/AudioOutputFlags.aidl
new file mode 100644
index 0000000..aebf871
--- /dev/null
+++ b/media/libaudioclient/aidl/android/media/AudioOutputFlags.aidl
@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package android.media;
+
+@Backing(type="int")
+enum AudioOutputFlags {
+    DIRECT           = 0,
+    PRIMARY          = 1,
+    FAST             = 2,
+    DEEP_BUFFER      = 3,
+    COMPRESS_OFFLOAD = 4,
+    NON_BLOCKING     = 5,
+    HW_AV_SYNC       = 6,
+    TTS              = 7,
+    RAW              = 8,
+    SYNC             = 9,
+    IEC958_NONAUDIO  = 10,
+    DIRECT_PCM       = 11,
+    MMAP_NOIRQ       = 12,
+    VOIP_RX          = 13,
+    INCALL_MUSIC     = 14,
+}
diff --git a/media/libaudioclient/aidl/android/media/AudioPatch.aidl b/media/libaudioclient/aidl/android/media/AudioPatch.aidl
new file mode 100644
index 0000000..8519faf
--- /dev/null
+++ b/media/libaudioclient/aidl/android/media/AudioPatch.aidl
@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.media;
+
+import android.media.AudioPortConfig;
+
+/**
+ * {@hide}
+ */
+parcelable AudioPatch {
+    /**
+     * Patch unique ID.
+     * Interpreted as audio_patch_handle_t.
+     */
+    int id;
+    AudioPortConfig[] sources;
+    AudioPortConfig[] sinks;
+}
diff --git a/media/libaudioclient/aidl/android/media/AudioPortConfig.aidl b/media/libaudioclient/aidl/android/media/AudioPortConfig.aidl
new file mode 100644
index 0000000..2dd30a4
--- /dev/null
+++ b/media/libaudioclient/aidl/android/media/AudioPortConfig.aidl
@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.media;
+
+import android.media.AudioGainConfig;
+import android.media.AudioIoFlags;
+import android.media.AudioPortConfigExt;
+import android.media.AudioPortConfigType;
+import android.media.AudioPortRole;
+import android.media.AudioPortType;
+import android.media.audio.common.AudioFormat;
+
+/**
+ * {@hide}
+ */
+parcelable AudioPortConfig {
+    /**
+     * Port unique ID.
+     * Interpreted as audio_port_handle_t.
+     */
+    int id;
+    /** Sink or source. */
+    AudioPortRole role;
+    /** Device, mix ... */
+    AudioPortType type;
+    /** Bitmask, indexed by AudioPortConfigType. */
+    int configMask;
+    /** Sampling rate in Hz. */
+    int sampleRate;
+    /**
+     * Channel mask, if applicable.
+     * Interpreted as audio_channel_mask_t.
+     * TODO: bitmask?
+     */
+    int channelMask;
+    /**
+     * Format, if applicable.
+     */
+    AudioFormat format;
+    /** Gain to apply, if applicable. */
+    AudioGainConfig gain;
+    /** Framework only: HW_AV_SYNC, DIRECT, ... */
+    AudioIoFlags flags;
+    AudioPortConfigExt ext;
+}
diff --git a/media/libaudioclient/aidl/android/media/AudioPortConfigDeviceExt.aidl b/media/libaudioclient/aidl/android/media/AudioPortConfigDeviceExt.aidl
new file mode 100644
index 0000000..a99aa9b
--- /dev/null
+++ b/media/libaudioclient/aidl/android/media/AudioPortConfigDeviceExt.aidl
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.media;
+
+/**
+ * {@hide}
+ */
+parcelable AudioPortConfigDeviceExt {
+    /**
+     * Module the device is attached to.
+     * Interpreted as audio_module_handle_t.
+     */
+    int hwModule;
+    /**
+     * Device type (e.g AUDIO_DEVICE_OUT_SPEAKER).
+     * Interpreted as audio_devices_t.
+     * TODO: Convert to a standalone AIDL representation.
+     */
+    int type;
+    /** Device address. "" if N/A. */
+    @utf8InCpp String address;
+}
diff --git a/media/libaudioclient/aidl/android/media/AudioPortConfigExt.aidl b/media/libaudioclient/aidl/android/media/AudioPortConfigExt.aidl
new file mode 100644
index 0000000..83e985e
--- /dev/null
+++ b/media/libaudioclient/aidl/android/media/AudioPortConfigExt.aidl
@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.media;
+
+import android.media.AudioPortConfigDeviceExt;
+import android.media.AudioPortConfigMixExt;
+import android.media.AudioPortConfigSessionExt;
+
+/**
+ * {@hide}
+ */
+parcelable AudioPortConfigExt {
+    // TODO(b/150948558): This should be a union. In the meantime, we require
+    // that exactly one of the below arrays has a single element and the rest
+    // are empty.
+
+    /** Device specific info. */
+    AudioPortConfigDeviceExt[] device;
+    /** Mix specific info. */
+    AudioPortConfigMixExt[] mix;
+    /** Session specific info. */
+    AudioPortConfigSessionExt[] session;
+}
diff --git a/media/libaudioclient/aidl/android/media/AudioPortConfigMixExt.aidl b/media/libaudioclient/aidl/android/media/AudioPortConfigMixExt.aidl
new file mode 100644
index 0000000..d3226f2
--- /dev/null
+++ b/media/libaudioclient/aidl/android/media/AudioPortConfigMixExt.aidl
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.media;
+
+import android.media.AudioPortConfigMixExtUseCase;
+
+/**
+ * {@hide}
+ */
+parcelable AudioPortConfigMixExt {
+    /**
+     * Module the stream is attached to.
+     * Interpreted as audio_module_handle_t.
+     */
+    int hwModule;
+    /**
+     * I/O handle of the input/output stream.
+     * Interpreted as audio_io_handle_t.
+     */
+    int handle;
+    AudioPortConfigMixExtUseCase usecase;
+}
diff --git a/media/libaudioclient/aidl/android/media/AudioPortConfigMixExtUseCase.aidl b/media/libaudioclient/aidl/android/media/AudioPortConfigMixExtUseCase.aidl
new file mode 100644
index 0000000..675daf8
--- /dev/null
+++ b/media/libaudioclient/aidl/android/media/AudioPortConfigMixExtUseCase.aidl
@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.media;
+
+import android.media.AudioSourceType;
+import android.media.AudioStreamType;
+
+/**
+ * {@hide}
+ */
+parcelable AudioPortConfigMixExtUseCase {
+    // TODO(b/150948558): This should be a union. In the meantime, we require
+    // that exactly one of the below arrays has a single element and the rest
+    // are empty.
+
+    /** This to be set if the containing config has the AudioPortRole::SOURCE role. */
+    AudioStreamType[] stream;
+    /** This to be set if the containing config has the AudioPortRole::SINK role. */
+    AudioSourceType[] source;
+}
diff --git a/media/libaudioclient/aidl/android/media/AudioPortConfigSessionExt.aidl b/media/libaudioclient/aidl/android/media/AudioPortConfigSessionExt.aidl
new file mode 100644
index 0000000..d3261d9
--- /dev/null
+++ b/media/libaudioclient/aidl/android/media/AudioPortConfigSessionExt.aidl
@@ -0,0 +1,26 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.media;
+
+import android.media.AudioSessionType;
+
+/**
+ * {@hide}
+ */
+parcelable AudioPortConfigSessionExt {
+    AudioSessionType session;
+}
diff --git a/media/libaudioclient/aidl/android/media/AudioPortConfigType.aidl b/media/libaudioclient/aidl/android/media/AudioPortConfigType.aidl
new file mode 100644
index 0000000..c7bb4d8
--- /dev/null
+++ b/media/libaudioclient/aidl/android/media/AudioPortConfigType.aidl
@@ -0,0 +1,25 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package android.media;
+
+@Backing(type="int")
+enum AudioPortConfigType {
+    SAMPLE_RATE  = 0,
+    CHANNEL_MASK = 1,
+    FORMAT       = 2,
+    GAIN         = 3,
+    FLAGS        = 4,
+}
diff --git a/media/libaudioclient/aidl/android/media/AudioPortRole.aidl b/media/libaudioclient/aidl/android/media/AudioPortRole.aidl
new file mode 100644
index 0000000..3212325
--- /dev/null
+++ b/media/libaudioclient/aidl/android/media/AudioPortRole.aidl
@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package android.media;
+
+@Backing(type="int")
+enum AudioPortRole {
+    NONE = 0,
+    SOURCE = 1,
+    SINK = 2,
+}
diff --git a/media/libaudioclient/aidl/android/media/AudioPortType.aidl b/media/libaudioclient/aidl/android/media/AudioPortType.aidl
new file mode 100644
index 0000000..90eea9a
--- /dev/null
+++ b/media/libaudioclient/aidl/android/media/AudioPortType.aidl
@@ -0,0 +1,24 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package android.media;
+
+@Backing(type="int")
+enum AudioPortType {
+    NONE = 0,
+    DEVICE = 1,
+    MIX = 2,
+    SESSION = 3,
+}
diff --git a/media/libaudioclient/aidl/android/media/AudioSessionType.aidl b/media/libaudioclient/aidl/android/media/AudioSessionType.aidl
new file mode 100644
index 0000000..d305c29
--- /dev/null
+++ b/media/libaudioclient/aidl/android/media/AudioSessionType.aidl
@@ -0,0 +1,25 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package android.media;
+
+@Backing(type="int")
+enum AudioSessionType {
+    DEVICE = -2,
+    OUTPUT_STAGE = -1,
+    OUTPUT_MIX = 0,
+    ALLOCATE = 0,
+    NONE = 0,
+}
diff --git a/media/libaudioclient/aidl/android/media/AudioSourceType.aidl b/media/libaudioclient/aidl/android/media/AudioSourceType.aidl
new file mode 100644
index 0000000..f6ecc46
--- /dev/null
+++ b/media/libaudioclient/aidl/android/media/AudioSourceType.aidl
@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package android.media;
+
+@Backing(type="int")
+enum AudioSourceType {
+    DEFAULT = 0,
+    MIC = 1,
+    VOICE_UPLINK = 2,
+    VOICE_DOWNLINK = 3,
+    VOICE_CALL = 4,
+    CAMCORDER = 5,
+    VOICE_RECOGNITION = 6,
+    VOICE_COMMUNICATION = 7,
+    REMOTE_SUBMIX = 8,
+    UNPROCESSED = 9,
+    VOICE_PERFORMANCE = 10,
+    ECHO_REFERENCE = 1997,
+    FM_TUNER = 1998,
+    /**
+     * A low-priority, preemptible audio source for for background software
+     * hotword detection. Same tuning as VOICE_RECOGNITION.
+     * Used only internally by the framework.
+     */
+    HOTWORD = 1999,
+}
diff --git a/media/libaudioclient/aidl/android/media/AudioStreamType.aidl b/media/libaudioclient/aidl/android/media/AudioStreamType.aidl
new file mode 100644
index 0000000..803b87b
--- /dev/null
+++ b/media/libaudioclient/aidl/android/media/AudioStreamType.aidl
@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package android.media;
+
+@Backing(type="int")
+enum AudioStreamType {
+    DEFAULT = -1,
+    VOICE_CALL = 0,
+    SYSTEM = 1,
+    RING = 2,
+    MUSIC = 3,
+    ALARM = 4,
+    NOTIFICATION = 5,
+    BLUETOOTH_SCO = 6,
+    ENFORCED_AUDIBLE = 7,
+    DTMF = 8,
+    TTS = 9,
+    ACCESSIBILITY = 10,
+    ASSISTANT = 11,
+    /** For dynamic policy output mixes. Only used by the audio policy */
+    REROUTING = 12,
+    /** For audio flinger tracks volume. Only used by the audioflinger */
+    PATCH = 13,
+    /** stream for corresponding to AUDIO_USAGE_CALL_ASSISTANT */
+    CALL_ASSISTANT = 14,
+}
diff --git a/media/libaudioclient/aidl/android/media/IAudioFlingerClient.aidl b/media/libaudioclient/aidl/android/media/IAudioFlingerClient.aidl
new file mode 100644
index 0000000..421c31c
--- /dev/null
+++ b/media/libaudioclient/aidl/android/media/IAudioFlingerClient.aidl
@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.media;
+
+import android.media.AudioIoConfigEvent;
+import android.media.AudioIoDescriptor;
+
+/**
+ * A callback interface for AudioFlinger.
+ *
+ * {@hide}
+ */
+interface IAudioFlingerClient {
+    oneway void ioConfigChanged(AudioIoConfigEvent event,
+                                in AudioIoDescriptor ioDesc);
+}
diff --git a/media/libaudioclient/include/media/AidlConversion.h b/media/libaudioclient/include/media/AidlConversion.h
new file mode 100644
index 0000000..a1b9b82
--- /dev/null
+++ b/media/libaudioclient/include/media/AidlConversion.h
@@ -0,0 +1,147 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <system/audio.h>
+
+#include <android-base/result.h>
+#include <android/media/AudioGainMode.h>
+#include <android/media/AudioInputFlags.h>
+#include <android/media/AudioIoConfigEvent.h>
+#include <android/media/AudioIoDescriptor.h>
+#include <android/media/AudioOutputFlags.h>
+#include <android/media/AudioPortConfigType.h>
+
+#include <media/AudioIoDescriptor.h>
+
+namespace android {
+
+template <typename T>
+using ConversionResult = base::expected<T, status_t>;
+
+// The legacy enum is unnamed. Thus, we use int.
+ConversionResult<int> aidl2legacy_AudioPortConfigType(media::AudioPortConfigType aidl);
+// The legacy enum is unnamed. Thus, we use int.
+ConversionResult<media::AudioPortConfigType> legacy2aidl_AudioPortConfigType(int legacy);
+
+ConversionResult<unsigned int> aidl2legacy_int32_t_config_mask(int32_t aidl);
+ConversionResult<int32_t> legacy2aidl_config_mask_int32_t(unsigned int legacy);
+
+ConversionResult<audio_channel_mask_t> aidl2legacy_int32_t_audio_channel_mask_t(int32_t aidl);
+ConversionResult<int32_t> legacy2aidl_audio_channel_mask_t_int32_t(audio_channel_mask_t legacy);
+
+ConversionResult<audio_io_config_event> aidl2legacy_AudioIoConfigEvent_audio_io_config_event(
+        media::AudioIoConfigEvent aidl);
+ConversionResult<media::AudioIoConfigEvent> legacy2aidl_audio_io_config_event_AudioIoConfigEvent(
+        audio_io_config_event legacy);
+
+ConversionResult<audio_port_role_t> aidl2legacy_AudioPortRole_audio_port_role_t(
+        media::AudioPortRole aidl);
+ConversionResult<media::AudioPortRole> legacy2aidl_audio_port_role_t_AudioPortRole(
+        audio_port_role_t legacy);
+
+ConversionResult<audio_port_type_t> aidl2legacy_AudioPortType_audio_port_type_t(
+        media::AudioPortType aidl);
+ConversionResult<media::AudioPortType> legacy2aidl_audio_port_type_t_AudioPortType(
+        audio_port_type_t legacy);
+
+ConversionResult<audio_format_t> aidl2legacy_AudioFormat_audio_format_t(
+        media::audio::common::AudioFormat aidl);
+ConversionResult<media::audio::common::AudioFormat> legacy2aidl_audio_format_t_AudioFormat(
+        audio_format_t legacy);
+
+ConversionResult<int> aidl2legacy_AudioGainMode_int(media::AudioGainMode aidl);
+ConversionResult<media::AudioGainMode> legacy2aidl_int_AudioGainMode(int legacy);
+
+ConversionResult<audio_gain_mode_t> aidl2legacy_int32_t_audio_gain_mode_t(int32_t aidl);
+ConversionResult<int32_t> legacy2aidl_audio_gain_mode_t_int32_t(audio_gain_mode_t legacy);
+
+ConversionResult<audio_devices_t> aidl2legacy_int32_t_audio_devices_t(int32_t aidl);
+ConversionResult<int32_t> legacy2aidl_audio_devices_t_int32_t(audio_devices_t legacy);
+
+ConversionResult<audio_gain_config> aidl2legacy_AudioGainConfig_audio_gain_config(
+        const media::AudioGainConfig& aidl, media::AudioPortRole role, media::AudioPortType type);
+ConversionResult<media::AudioGainConfig> legacy2aidl_audio_gain_config_AudioGainConfig(
+        const audio_gain_config& legacy, audio_port_role_t role, audio_port_type_t type);
+
+ConversionResult<audio_input_flags_t> aidl2legacy_AudioInputFlags_audio_input_flags_t(
+        media::AudioInputFlags aidl);
+ConversionResult<media::AudioInputFlags> legacy2aidl_audio_input_flags_t_AudioInputFlags(
+        audio_input_flags_t legacy);
+
+ConversionResult<audio_output_flags_t> aidl2legacy_AudioOutputFlags_audio_output_flags_t(
+        media::AudioOutputFlags aidl);
+ConversionResult<media::AudioOutputFlags> legacy2aidl_audio_output_flags_t_AudioOutputFlags(
+        audio_output_flags_t legacy);
+
+ConversionResult<audio_input_flags_t> aidl2legacy_audio_input_flags_mask(int32_t aidl);
+ConversionResult<int32_t> legacy2aidl_audio_input_flags_mask(audio_input_flags_t legacy);
+
+ConversionResult<audio_output_flags_t> aidl2legacy_audio_output_flags_mask(int32_t aidl);
+ConversionResult<int32_t> legacy2aidl_audio_output_flags_mask(audio_output_flags_t legacy);
+
+ConversionResult<audio_io_flags> aidl2legacy_AudioIoFlags_audio_io_flags(
+        const media::AudioIoFlags& aidl, media::AudioPortRole role, media::AudioPortType type);
+ConversionResult<media::AudioIoFlags> legacy2aidl_audio_io_flags_AudioIoFlags(
+        const audio_io_flags& legacy, audio_port_role_t role, audio_port_type_t type);
+
+ConversionResult<audio_port_config_device_ext> aidl2legacy_AudioPortConfigDeviceExt(
+        const media::AudioPortConfigDeviceExt& aidl);
+ConversionResult<media::AudioPortConfigDeviceExt> legacy2aidl_AudioPortConfigDeviceExt(
+        const audio_port_config_device_ext& legacy);
+
+ConversionResult<audio_stream_type_t> aidl2legacy_AudioStreamType_audio_stream_type_t(
+        media::AudioStreamType aidl);
+ConversionResult<media::AudioStreamType> legacy2aidl_audio_stream_type_t_AudioStreamType(
+        audio_stream_type_t legacy);
+
+ConversionResult<audio_source_t> aidl2legacy_AudioSourceType_audio_source_t(
+        media::AudioSourceType aidl);
+ConversionResult<media::AudioSourceType> legacy2aidl_audio_source_t_AudioSourceType(
+        audio_source_t legacy);
+
+ConversionResult<audio_session_t> aidl2legacy_AudioSessionType_audio_session_t(
+        media::AudioSessionType aidl);
+ConversionResult<media::AudioSessionType> legacy2aidl_audio_session_t_AudioSessionType(
+        audio_session_t legacy);
+
+ConversionResult<audio_port_config_mix_ext> aidl2legacy_AudioPortConfigMixExt(
+        const media::AudioPortConfigMixExt& aidl, media::AudioPortRole role);
+ConversionResult<media::AudioPortConfigMixExt> legacy2aidl_AudioPortConfigMixExt(
+        const audio_port_config_mix_ext& legacy, audio_port_role_t role);
+
+ConversionResult<audio_port_config_session_ext> aidl2legacy_AudioPortConfigSessionExt(
+        const media::AudioPortConfigSessionExt& aidl);
+ConversionResult<media::AudioPortConfigSessionExt> legacy2aidl_AudioPortConfigSessionExt(
+        const audio_port_config_session_ext& legacy);
+
+ConversionResult<audio_port_config> aidl2legacy_AudioPortConfig_audio_port_config(
+        const media::AudioPortConfig& aidl);
+ConversionResult<media::AudioPortConfig> legacy2aidl_audio_port_config_AudioPortConfig(
+        const audio_port_config& legacy);
+
+ConversionResult<struct audio_patch> aidl2legacy_AudioPatch_audio_patch(
+        const media::AudioPatch& aidl);
+ConversionResult<media::AudioPatch> legacy2aidl_audio_patch_AudioPatch(
+        const struct audio_patch& legacy);
+
+ConversionResult<sp<AudioIoDescriptor>> aidl2legacy_AudioIoDescriptor_AudioIoDescriptor(
+        const media::AudioIoDescriptor& aidl);
+ConversionResult<media::AudioIoDescriptor> legacy2aidl_AudioIoDescriptor_AudioIoDescriptor(
+        const sp<AudioIoDescriptor>& legacy);
+
+}  // namespace android
diff --git a/media/libaudioclient/include/media/AudioSystem.h b/media/libaudioclient/include/media/AudioSystem.h
index 848743a..dfc1982 100644
--- a/media/libaudioclient/include/media/AudioSystem.h
+++ b/media/libaudioclient/include/media/AudioSystem.h
@@ -19,12 +19,12 @@
 
 #include <sys/types.h>
 
+#include <android/media/BnAudioFlingerClient.h>
 #include <media/AudioDeviceTypeAddr.h>
 #include <media/AudioPolicy.h>
 #include <media/AudioProductStrategy.h>
 #include <media/AudioVolumeGroup.h>
 #include <media/AudioIoDescriptor.h>
-#include <media/IAudioFlingerClient.h>
 #include <media/IAudioPolicyServiceClient.h>
 #include <media/MicrophoneInfo.h>
 #include <set>
@@ -531,7 +531,7 @@
 
 private:
 
-    class AudioFlingerClient: public IBinder::DeathRecipient, public BnAudioFlingerClient
+    class AudioFlingerClient: public IBinder::DeathRecipient, public media::BnAudioFlingerClient
     {
     public:
         AudioFlingerClient() :
@@ -551,9 +551,9 @@
 
         // indicate a change in the configuration of an output or input: keeps the cached
         // values for output/input parameters up-to-date in client process
-        virtual void ioConfigChanged(audio_io_config_event event,
-                                     const sp<AudioIoDescriptor>& ioDesc);
-
+        binder::Status ioConfigChanged(
+                media::AudioIoConfigEvent event,
+                const media::AudioIoDescriptor& ioDesc) override;
 
         status_t addAudioDeviceCallback(const wp<AudioDeviceCallback>& callback,
                                                audio_io_handle_t audioIo,
diff --git a/media/libaudioclient/include/media/IAudioFlinger.h b/media/libaudioclient/include/media/IAudioFlinger.h
index a01b681..413db71 100644
--- a/media/libaudioclient/include/media/IAudioFlinger.h
+++ b/media/libaudioclient/include/media/IAudioFlinger.h
@@ -29,7 +29,6 @@
 #include <media/AudioClient.h>
 #include <media/DeviceDescriptorBase.h>
 #include <media/IAudioTrack.h>
-#include <media/IAudioFlingerClient.h>
 #include <system/audio.h>
 #include <system/audio_effect.h>
 #include <system/audio_policy.h>
@@ -39,6 +38,7 @@
 #include <vector>
 
 #include "android/media/IAudioRecord.h"
+#include "android/media/IAudioFlingerClient.h"
 #include "android/media/IAudioTrackCallback.h"
 #include "android/media/IEffect.h"
 #include "android/media/IEffectClient.h"
@@ -420,7 +420,7 @@
     // Register an object to receive audio input/output change and track notifications.
     // For a given calling pid, AudioFlinger disregards any registrations after the first.
     // Thus the IAudioFlingerClient must be a singleton per process.
-    virtual void registerClient(const sp<IAudioFlingerClient>& client) = 0;
+    virtual void registerClient(const sp<media::IAudioFlingerClient>& client) = 0;
 
     // retrieve the audio recording buffer size in bytes
     // FIXME This API assumes a route, and so should be deprecated.
diff --git a/media/libaudioclient/include/media/IAudioFlingerClient.h b/media/libaudioclient/include/media/IAudioFlingerClient.h
deleted file mode 100644
index 0080bc9..0000000
--- a/media/libaudioclient/include/media/IAudioFlingerClient.h
+++ /dev/null
@@ -1,58 +0,0 @@
-/*
- * Copyright (C) 2009 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.
- */
-
-#ifndef ANDROID_IAUDIOFLINGERCLIENT_H
-#define ANDROID_IAUDIOFLINGERCLIENT_H
-
-
-#include <utils/RefBase.h>
-#include <binder/IInterface.h>
-#include <utils/KeyedVector.h>
-#include <system/audio.h>
-#include <media/AudioIoDescriptor.h>
-
-namespace android {
-
-// ----------------------------------------------------------------------------
-
-class IAudioFlingerClient : public IInterface
-{
-public:
-    DECLARE_META_INTERFACE(AudioFlingerClient);
-
-    // Notifies a change of audio input/output configuration.
-    virtual void ioConfigChanged(audio_io_config_event event,
-                                 const sp<AudioIoDescriptor>& ioDesc) = 0;
-
-};
-
-
-// ----------------------------------------------------------------------------
-
-class BnAudioFlingerClient : public BnInterface<IAudioFlingerClient>
-{
-public:
-    virtual status_t    onTransact( uint32_t code,
-                                    const Parcel& data,
-                                    Parcel* reply,
-                                    uint32_t flags = 0);
-};
-
-// ----------------------------------------------------------------------------
-
-}; // namespace android
-
-#endif // ANDROID_IAUDIOFLINGERCLIENT_H
diff --git a/media/libstagefright/codecs/m4v_h263/dec/src/idct_vca.cpp b/media/libstagefright/codecs/m4v_h263/dec/src/idct_vca.cpp
index 0ba4944..dbaf5d1 100644
--- a/media/libstagefright/codecs/m4v_h263/dec/src/idct_vca.cpp
+++ b/media/libstagefright/codecs/m4v_h263/dec/src/idct_vca.cpp
@@ -37,6 +37,7 @@
     return ;
 }
 
+__attribute__((no_sanitize("signed-integer-overflow")))
 void idctrow1(int16 *blk, uint8 *pred, uint8 *dst, int width)
 {
     /* shortcut */
@@ -156,6 +157,7 @@
     return ;
 }
 
+__attribute__((no_sanitize("signed-integer-overflow")))
 void idctcol2(int16 *blk)
 {
     int32 x0, x1, x3, x5, x7;//, x8;
@@ -256,6 +258,7 @@
     return ;
 }
 
+__attribute__((no_sanitize("signed-integer-overflow")))
 void idctcol3(int16 *blk)
 {
     int32 x0, x1, x2, x3, x4, x5, x6, x7, x8;
diff --git a/services/audioflinger/Android.bp b/services/audioflinger/Android.bp
index 12f6eba..261af5a 100644
--- a/services/audioflinger/Android.bp
+++ b/services/audioflinger/Android.bp
@@ -35,6 +35,9 @@
     ],
 
     shared_libs: [
+        "audioflinger-aidl-unstable-cpp",
+        "audioclient-types-aidl-unstable-cpp",
+        "libaudioclient_aidl_conversion",
         "libaudiofoundation",
         "libaudiohal",
         "libaudioprocessing",
diff --git a/services/audioflinger/AudioFlinger.cpp b/services/audioflinger/AudioFlinger.cpp
index eae9437..e589eb9 100644
--- a/services/audioflinger/AudioFlinger.cpp
+++ b/services/audioflinger/AudioFlinger.cpp
@@ -22,6 +22,13 @@
 // Define AUDIO_ARRAYS_STATIC_CHECK to check all audio arrays are correct
 #define AUDIO_ARRAYS_STATIC_CHECK 1
 
+#define VALUE_OR_FATAL(result) \
+    ({ auto _tmp = (result); \
+       LOG_ALWAYS_FATAL_IF(!_tmp.ok(), \
+                           "Failed result (%d)", \
+                           _tmp.error()); \
+       _tmp.value(); })
+
 #include "Configuration.h"
 #include <dirent.h>
 #include <math.h>
@@ -68,6 +75,7 @@
 #include <powermanager/PowerManager.h>
 
 #include <media/IMediaLogService.h>
+#include <media/AidlConversion.h>
 #include <media/nbaio/Pipe.h>
 #include <media/nbaio/PipeReader.h>
 #include <mediautils/BatteryNotifier.h>
@@ -1774,7 +1782,7 @@
     return BAD_VALUE;
 }
 
-void AudioFlinger::registerClient(const sp<IAudioFlingerClient>& client)
+void AudioFlinger::registerClient(const sp<media::IAudioFlingerClient>& client)
 {
     Mutex::Autolock _l(mLock);
     if (client == 0) {
@@ -1849,13 +1857,18 @@
 
 void AudioFlinger::ioConfigChanged(audio_io_config_event event,
                                    const sp<AudioIoDescriptor>& ioDesc,
-                                   pid_t pid)
-{
+                                   pid_t pid) {
+    media::AudioIoDescriptor descAidl = VALUE_OR_FATAL(
+            legacy2aidl_AudioIoDescriptor_AudioIoDescriptor(ioDesc));
+    media::AudioIoConfigEvent eventAidl = VALUE_OR_FATAL(
+            legacy2aidl_audio_io_config_event_AudioIoConfigEvent(event));
+
     Mutex::Autolock _l(mClientLock);
     size_t size = mNotificationClients.size();
     for (size_t i = 0; i < size; i++) {
         if ((pid == 0) || (mNotificationClients.keyAt(i) == pid)) {
-            mNotificationClients.valueAt(i)->audioFlingerClient()->ioConfigChanged(event, ioDesc);
+            mNotificationClients.valueAt(i)->audioFlingerClient()->ioConfigChanged(eventAidl,
+                                                                                   descAidl);
         }
     }
 }
@@ -1929,7 +1942,7 @@
 // ----------------------------------------------------------------------------
 
 AudioFlinger::NotificationClient::NotificationClient(const sp<AudioFlinger>& audioFlinger,
-                                                     const sp<IAudioFlingerClient>& client,
+                                                     const sp<media::IAudioFlingerClient>& client,
                                                      pid_t pid,
                                                      uid_t uid)
     : mAudioFlinger(audioFlinger), mPid(pid), mUid(uid), mAudioFlingerClient(client)
diff --git a/services/audioflinger/AudioFlinger.h b/services/audioflinger/AudioFlinger.h
index 14a4df7..65d672a 100644
--- a/services/audioflinger/AudioFlinger.h
+++ b/services/audioflinger/AudioFlinger.h
@@ -33,16 +33,16 @@
 #include <sys/types.h>
 #include <limits.h>
 
+#include <android/media/IAudioFlingerClient.h>
 #include <android/media/IAudioTrackCallback.h>
 #include <android/os/BnExternalVibrationController.h>
-#include <android-base/macros.h>
 
+#include <android-base/macros.h>
 #include <cutils/atomic.h>
 #include <cutils/compiler.h>
-#include <cutils/properties.h>
 
+#include <cutils/properties.h>
 #include <media/IAudioFlinger.h>
-#include <media/IAudioFlingerClient.h>
 #include <media/IAudioTrack.h>
 #include <media/AudioSystem.h>
 #include <media/AudioTrack.h>
@@ -177,7 +177,7 @@
     virtual     status_t    setParameters(audio_io_handle_t ioHandle, const String8& keyValuePairs);
     virtual     String8     getParameters(audio_io_handle_t ioHandle, const String8& keys) const;
 
-    virtual     void        registerClient(const sp<IAudioFlingerClient>& client);
+    virtual     void        registerClient(const sp<media::IAudioFlingerClient>& client);
 
     virtual     size_t      getInputBufferSize(uint32_t sampleRate, audio_format_t format,
                                                audio_channel_mask_t channelMask) const;
@@ -490,12 +490,12 @@
     class NotificationClient : public IBinder::DeathRecipient {
     public:
                             NotificationClient(const sp<AudioFlinger>& audioFlinger,
-                                                const sp<IAudioFlingerClient>& client,
+                                                const sp<media::IAudioFlingerClient>& client,
                                                 pid_t pid,
                                                 uid_t uid);
         virtual             ~NotificationClient();
 
-                sp<IAudioFlingerClient> audioFlingerClient() const { return mAudioFlingerClient; }
+                sp<media::IAudioFlingerClient> audioFlingerClient() const { return mAudioFlingerClient; }
                 pid_t getPid() const { return mPid; }
                 uid_t getUid() const { return mUid; }
 
@@ -508,7 +508,7 @@
         const sp<AudioFlinger>  mAudioFlinger;
         const pid_t             mPid;
         const uid_t             mUid;
-        const sp<IAudioFlingerClient> mAudioFlingerClient;
+        const sp<media::IAudioFlingerClient> mAudioFlingerClient;
     };
 
     // --- MediaLogNotifier ---
diff --git a/services/audiopolicy/common/managerdefinitions/include/AudioPolicyConfig.h b/services/audiopolicy/common/managerdefinitions/include/AudioPolicyConfig.h
index 395bc70..cf1f64c 100644
--- a/services/audiopolicy/common/managerdefinitions/include/AudioPolicyConfig.h
+++ b/services/audiopolicy/common/managerdefinitions/include/AudioPolicyConfig.h
@@ -33,6 +33,15 @@
 
 namespace android {
 
+// This class gathers together various bits of AudioPolicyManager
+// configuration, which are usually filled out as a result of parsing
+// the audio_policy_configuration.xml file.
+//
+// Note that AudioPolicyConfig doesn't own some of the data,
+// it simply proxies access to the fields of AudioPolicyManager
+// class. Be careful about the fields that are references,
+// e.g. 'mOutputDevices'. This also means that it's impossible
+// to implement "deep copying" of this class without re-designing it.
 class AudioPolicyConfig
 {
 public:
@@ -40,14 +49,24 @@
                       DeviceVector &outputDevices,
                       DeviceVector &inputDevices,
                       sp<DeviceDescriptor> &defaultOutputDevice)
-        : mEngineLibraryNameSuffix(kDefaultEngineLibraryNameSuffix),
-          mHwModules(hwModules),
+        : mHwModules(hwModules),
           mOutputDevices(outputDevices),
           mInputDevices(inputDevices),
-          mDefaultOutputDevice(defaultOutputDevice),
-          mIsSpeakerDrcEnabled(false),
-          mIsCallScreenModeSupported(false)
-    {}
+          mDefaultOutputDevice(defaultOutputDevice) {
+        clear();
+    }
+
+    void clear() {
+        mSource = {};
+        mEngineLibraryNameSuffix = kDefaultEngineLibraryNameSuffix;
+        mHwModules.clear();
+        mOutputDevices.clear();
+        mInputDevices.clear();
+        mDefaultOutputDevice.clear();
+        mIsSpeakerDrcEnabled = false;
+        mIsCallScreenModeSupported = false;
+        mSurroundFormats.clear();
+    }
 
     const std::string& getSource() const {
         return mSource;
diff --git a/services/audiopolicy/common/managerdefinitions/src/Serializer.cpp b/services/audiopolicy/common/managerdefinitions/src/Serializer.cpp
index 889f031..333b6fe 100644
--- a/services/audiopolicy/common/managerdefinitions/src/Serializer.cpp
+++ b/services/audiopolicy/common/managerdefinitions/src/Serializer.cpp
@@ -254,9 +254,8 @@
 constexpr void (*xmlDeleter)(T* t);
 template <>
 constexpr auto xmlDeleter<xmlDoc> = xmlFreeDoc;
-// http://b/111067277 - Add back constexpr when we switch to C++17.
 template <>
-auto xmlDeleter<xmlChar> = [](xmlChar *s) { xmlFree(s); };
+constexpr auto xmlDeleter<xmlChar> = [](xmlChar *s) { xmlFree(s); };
 
 /** @return a unique_ptr with the correct deleter for the libxml2 object. */
 template <class T>
@@ -804,7 +803,9 @@
 status_t deserializeAudioPolicyFile(const char *fileName, AudioPolicyConfig *config)
 {
     PolicySerializer serializer;
-    return serializer.deserialize(fileName, config);
+    status_t status = serializer.deserialize(fileName, config);
+    if (status != OK) config->clear();
+    return status;
 }
 
 } // namespace android
diff --git a/services/audiopolicy/engine/common/src/EngineBase.cpp b/services/audiopolicy/engine/common/src/EngineBase.cpp
index 1875c10..8c7fb97 100644
--- a/services/audiopolicy/engine/common/src/EngineBase.cpp
+++ b/services/audiopolicy/engine/common/src/EngineBase.cpp
@@ -19,7 +19,6 @@
 
 #include "EngineBase.h"
 #include "EngineDefaultConfig.h"
-#include "../include/EngineBase.h"
 #include <TypeConverter.h>
 
 namespace android {
diff --git a/services/audiopolicy/engine/config/TEST_MAPPING b/services/audiopolicy/engine/config/TEST_MAPPING
new file mode 100644
index 0000000..06ce111
--- /dev/null
+++ b/services/audiopolicy/engine/config/TEST_MAPPING
@@ -0,0 +1,7 @@
+{
+  "presubmit": [
+    {
+       "name": "audiopolicy_engineconfig_tests"
+    }
+  ]
+}
diff --git a/services/audiopolicy/engine/config/include/EngineConfig.h b/services/audiopolicy/engine/config/include/EngineConfig.h
index 5d22c24..c565926 100644
--- a/services/audiopolicy/engine/config/include/EngineConfig.h
+++ b/services/audiopolicy/engine/config/include/EngineConfig.h
@@ -111,6 +111,8 @@
  */
 ParsingResult parse(const char* path = DEFAULT_PATH);
 android::status_t parseLegacyVolumes(VolumeGroups &volumeGroups);
+// Exposed for testing.
+android::status_t parseLegacyVolumeFile(const char* path, VolumeGroups &volumeGroups);
 
 } // namespace engineConfig
 } // namespace android
diff --git a/services/audiopolicy/engine/config/src/EngineConfig.cpp b/services/audiopolicy/engine/config/src/EngineConfig.cpp
index daf6418..7cfef5b 100644
--- a/services/audiopolicy/engine/config/src/EngineConfig.cpp
+++ b/services/audiopolicy/engine/config/src/EngineConfig.cpp
@@ -589,6 +589,7 @@
             }
         }
     }
+    VolumeGroups tempVolumeGroups = volumeGroups;
     for (const auto &volumeMapIter : legacyVolumeMap) {
         // In order to let AudioService setting the min and max (compatibility), set Min and Max
         // to -1 except for private streams
@@ -599,8 +600,10 @@
         }
         int indexMin = streamType >= AUDIO_STREAM_PUBLIC_CNT ? 0 : -1;
         int indexMax = streamType >= AUDIO_STREAM_PUBLIC_CNT ? 100 : -1;
-        volumeGroups.push_back({ volumeMapIter.first, indexMin, indexMax, volumeMapIter.second });
+        tempVolumeGroups.push_back(
+                { volumeMapIter.first, indexMin, indexMax, volumeMapIter.second });
     }
+    std::swap(tempVolumeGroups, volumeGroups);
     return NO_ERROR;
 }
 
@@ -695,35 +698,14 @@
     return deserializeLegacyVolumeCollection(doc, cur, volumeGroups, nbSkippedElements);
 }
 
-static const int gApmXmlConfigFilePathMaxLength = 128;
-
-static constexpr const char *apmXmlConfigFileName = "audio_policy_configuration.xml";
-static constexpr const char *apmA2dpOffloadDisabledXmlConfigFileName =
-        "audio_policy_configuration_a2dp_offload_disabled.xml";
-
 android::status_t parseLegacyVolumes(VolumeGroups &volumeGroups) {
-    char audioPolicyXmlConfigFile[gApmXmlConfigFilePathMaxLength];
-    std::vector<const char *> fileNames;
-    status_t ret;
-
-    if (property_get_bool("ro.bluetooth.a2dp_offload.supported", false) &&
-            property_get_bool("persist.bluetooth.a2dp_offload.disabled", false)) {
-        // A2DP offload supported but disabled: try to use special XML file
-        fileNames.push_back(apmA2dpOffloadDisabledXmlConfigFileName);
+    if (std::string audioPolicyXmlConfigFile = audio_get_audio_policy_config_file();
+            !audioPolicyXmlConfigFile.empty()) {
+        return parseLegacyVolumeFile(audioPolicyXmlConfigFile.c_str(), volumeGroups);
+    } else {
+        ALOGE("No readable audio policy config file found");
+        return BAD_VALUE;
     }
-    fileNames.push_back(apmXmlConfigFileName);
-
-    for (const char* fileName : fileNames) {
-        for (const auto& path : audio_get_configuration_paths()) {
-            snprintf(audioPolicyXmlConfigFile, sizeof(audioPolicyXmlConfigFile),
-                     "%s/%s", path.c_str(), fileName);
-            ret = parseLegacyVolumeFile(audioPolicyXmlConfigFile, volumeGroups);
-            if (ret == NO_ERROR) {
-                return ret;
-            }
-        }
-    }
-    return BAD_VALUE;
 }
 
 } // namespace engineConfig
diff --git a/services/audiopolicy/engine/config/tests/Android.bp b/services/audiopolicy/engine/config/tests/Android.bp
new file mode 100644
index 0000000..6b0774f
--- /dev/null
+++ b/services/audiopolicy/engine/config/tests/Android.bp
@@ -0,0 +1,25 @@
+cc_test {
+    name: "audiopolicy_engineconfig_tests",
+
+    shared_libs: [
+        "libbase",
+        "liblog",
+        "libmedia_helper",
+        "libutils",
+        "libxml2",
+    ],
+    static_libs: [
+        "libaudiopolicyengine_config",
+    ],
+
+    srcs: ["engineconfig_tests.cpp"],
+
+    data: [":audiopolicy_engineconfig_files"],
+
+    cflags: [
+        "-Werror",
+        "-Wall",
+    ],
+
+    test_suites: ["device-tests"],
+}
diff --git a/services/audiopolicy/engine/config/tests/engineconfig_tests.cpp b/services/audiopolicy/engine/config/tests/engineconfig_tests.cpp
new file mode 100644
index 0000000..f61e02f
--- /dev/null
+++ b/services/audiopolicy/engine/config/tests/engineconfig_tests.cpp
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2020 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 <gtest/gtest.h>
+
+#define LOG_TAG "APM_Test"
+#include <android-base/file.h>
+#include <log/log.h>
+
+#include "EngineConfig.h"
+
+using namespace android;
+
+TEST(EngineConfigTestInit, LegacyVolumeGroupsLoadingIsTransactional) {
+    engineConfig::VolumeGroups groups;
+    ASSERT_TRUE(groups.empty());
+    status_t status = engineConfig::parseLegacyVolumeFile(
+            (base::GetExecutableDirectory() + "/test_invalid_apm_volume_tables.xml").c_str(),
+            groups);
+    ASSERT_NE(NO_ERROR, status);
+    EXPECT_TRUE(groups.empty());
+    status = engineConfig::parseLegacyVolumeFile(
+            (base::GetExecutableDirectory() + "/test_apm_volume_tables.xml").c_str(),
+            groups);
+    ASSERT_EQ(NO_ERROR, status);
+    EXPECT_FALSE(groups.empty());
+}
diff --git a/services/audiopolicy/engine/config/tests/resources/Android.bp b/services/audiopolicy/engine/config/tests/resources/Android.bp
new file mode 100644
index 0000000..0aee0e9
--- /dev/null
+++ b/services/audiopolicy/engine/config/tests/resources/Android.bp
@@ -0,0 +1,7 @@
+filegroup {
+    name: "audiopolicy_engineconfig_files",
+    srcs: [
+        "test_apm_volume_tables.xml",
+        "test_invalid_apm_volume_tables.xml",
+    ],
+}
diff --git a/services/audiopolicy/engine/config/tests/resources/test_apm_volume_tables.xml b/services/audiopolicy/engine/config/tests/resources/test_apm_volume_tables.xml
new file mode 100644
index 0000000..16126b6
--- /dev/null
+++ b/services/audiopolicy/engine/config/tests/resources/test_apm_volume_tables.xml
@@ -0,0 +1,42 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<!-- Copyright (C) 2020 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.
+-->
+
+<audioPolicyConfiguration version="1.0" xmlns:xi="http://www.w3.org/2001/XInclude">
+    <globalConfiguration speaker_drc_enabled="true"/>
+    <volumes>
+        <volume stream="AUDIO_STREAM_VOICE_CALL" deviceCategory="DEVICE_CATEGORY_HEADSET">
+            <point>0,-4200</point>
+            <point>33,-2800</point>
+            <point>66,-1400</point>
+            <point>100,0</point>
+        </volume>
+        <volume stream="AUDIO_STREAM_VOICE_CALL" deviceCategory="DEVICE_CATEGORY_SPEAKER">
+            <point>0,-2400</point>
+            <point>33,-1600</point>
+            <point>66,-800</point>
+            <point>100,0</point>
+        </volume>
+        <volume stream="AUDIO_STREAM_VOICE_CALL" deviceCategory="DEVICE_CATEGORY_HEARING_AID"
+                ref="FULL_SCALE_VOLUME_CURVE"/>
+    </volumes>
+    <volumes>
+        <reference name="FULL_SCALE_VOLUME_CURVE">
+            <!-- Full Scale reference Volume Curve -->
+            <point>0,0</point>
+            <point>100,0</point>
+        </reference>
+    </volumes>
+</audioPolicyConfiguration>
diff --git a/services/audiopolicy/engine/config/tests/resources/test_invalid_apm_volume_tables.xml b/services/audiopolicy/engine/config/tests/resources/test_invalid_apm_volume_tables.xml
new file mode 100644
index 0000000..3ec5d10
--- /dev/null
+++ b/services/audiopolicy/engine/config/tests/resources/test_invalid_apm_volume_tables.xml
@@ -0,0 +1,59 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<!-- Copyright (C) 2020 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+
+<!-- This file uses a non-existent audio stream name. -->
+<audioPolicyConfiguration version="1.0" xmlns:xi="http://www.w3.org/2001/XInclude">
+    <globalConfiguration speaker_drc_enabled="true"/>
+    <volumes>
+        <volume stream="AUDIO_STREAM_VOICE_CALL" deviceCategory="DEVICE_CATEGORY_HEADSET">
+            <point>0,-4200</point>
+            <point>33,-2800</point>
+            <point>66,-1400</point>
+            <point>100,0</point>
+        </volume>
+        <volume stream="AUDIO_STREAM_NON_EXISTING" deviceCategory="DEVICE_CATEGORY_SPEAKER">
+            <point>0,-2400</point>
+            <point>33,-1600</point>
+            <point>66,-800</point>
+            <point>100,0</point>
+        </volume>
+        <volume stream="AUDIO_STREAM_RING" deviceCategory="DEVICE_CATEGORY_HEADSET"
+                ref="FULL_SCALE_VOLUME_CURVE"/>
+        <volume stream="AUDIO_STREAM_MUSIC" deviceCategory="DEVICE_CATEGORY_HEADSET"
+                ref="FULL_SCALE_VOLUME_CURVE"/>
+        <volume stream="AUDIO_STREAM_ALARM" deviceCategory="DEVICE_CATEGORY_SPEAKER">
+            <point>0,-2970</point>
+            <point>33,-2010</point>
+            <point>66,-1020</point>
+            <point>100,0</point>
+        </volume>
+        <volume stream="AUDIO_STREAM_NOTIFICATION" deviceCategory="DEVICE_CATEGORY_HEADSET"
+                ref="FULL_SCALE_VOLUME_CURVE"/>
+        <volume stream="AUDIO_STREAM_BLUETOOTH_SCO" deviceCategory="DEVICE_CATEGORY_EXT_MEDIA"
+                ref="FULL_SCALE_VOLUME_CURVE"/>
+        <volume stream="AUDIO_STREAM_ENFORCED_AUDIBLE" deviceCategory="DEVICE_CATEGORY_HEARING_AID"
+                ref="FULL_SCALE_VOLUME_CURVE"/>
+        <volume stream="AUDIO_STREAM_DTMF" deviceCategory="DEVICE_CATEGORY_SPEAKER"
+                ref="FULL_SCALE_VOLUME_CURVE"/>
+    </volumes>
+    <volumes>
+        <reference name="FULL_SCALE_VOLUME_CURVE">
+            <!-- Full Scale reference Volume Curve -->
+            <point>0,0</point>
+            <point>100,0</point>
+        </reference>
+    </volumes>
+</audioPolicyConfiguration>
diff --git a/services/audiopolicy/managerdefault/AudioPolicyManager.cpp b/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
index e4b0dd1..ad1f147 100644
--- a/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
+++ b/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
@@ -29,31 +29,26 @@
 #define ALOGVV(a...) do { } while(0)
 #endif
 
-#define AUDIO_POLICY_XML_CONFIG_FILE_PATH_MAX_LENGTH 128
-#define AUDIO_POLICY_XML_CONFIG_FILE_NAME "audio_policy_configuration.xml"
-#define AUDIO_POLICY_A2DP_OFFLOAD_DISABLED_XML_CONFIG_FILE_NAME \
-        "audio_policy_configuration_a2dp_offload_disabled.xml"
-#define AUDIO_POLICY_BLUETOOTH_LEGACY_HAL_XML_CONFIG_FILE_NAME \
-        "audio_policy_configuration_bluetooth_legacy_hal.xml"
-
 #include <algorithm>
 #include <inttypes.h>
 #include <math.h>
 #include <set>
 #include <unordered_set>
 #include <vector>
+
+#include <Serializer.h>
 #include <cutils/bitops.h>
 #include <cutils/properties.h>
-#include <utils/Log.h>
 #include <media/AudioParameter.h>
+#include <policy.h>
 #include <private/android_filesystem_config.h>
 #include <system/audio.h>
 #include <system/audio_config.h>
 #include <system/audio_effects/effect_hapticgenerator.h>
+#include <utils/Log.h>
+
 #include "AudioPolicyManager.h"
-#include <Serializer.h>
 #include "TypeConverter.h"
-#include <policy.h>
 
 namespace android {
 
@@ -4539,37 +4534,15 @@
 }
 
 static status_t deserializeAudioPolicyXmlConfig(AudioPolicyConfig &config) {
-    char audioPolicyXmlConfigFile[AUDIO_POLICY_XML_CONFIG_FILE_PATH_MAX_LENGTH];
-    std::vector<const char*> fileNames;
-    status_t ret;
-
-    if (property_get_bool("ro.bluetooth.a2dp_offload.supported", false)) {
-        if (property_get_bool("persist.bluetooth.bluetooth_audio_hal.disabled", false) &&
-            property_get_bool("persist.bluetooth.a2dp_offload.disabled", false)) {
-            // Both BluetoothAudio@2.0 and BluetoothA2dp@1.0 (Offlaod) are disabled, and uses
-            // the legacy hardware module for A2DP and hearing aid.
-            fileNames.push_back(AUDIO_POLICY_BLUETOOTH_LEGACY_HAL_XML_CONFIG_FILE_NAME);
-        } else if (property_get_bool("persist.bluetooth.a2dp_offload.disabled", false)) {
-            // A2DP offload supported but disabled: try to use special XML file
-            fileNames.push_back(AUDIO_POLICY_A2DP_OFFLOAD_DISABLED_XML_CONFIG_FILE_NAME);
+    if (std::string audioPolicyXmlConfigFile = audio_get_audio_policy_config_file();
+            !audioPolicyXmlConfigFile.empty()) {
+        status_t ret = deserializeAudioPolicyFile(audioPolicyXmlConfigFile.c_str(), &config);
+        if (ret == NO_ERROR) {
+            config.setSource(audioPolicyXmlConfigFile);
         }
-    } else if (property_get_bool("persist.bluetooth.bluetooth_audio_hal.disabled", false)) {
-        fileNames.push_back(AUDIO_POLICY_BLUETOOTH_LEGACY_HAL_XML_CONFIG_FILE_NAME);
+        return ret;
     }
-    fileNames.push_back(AUDIO_POLICY_XML_CONFIG_FILE_NAME);
-
-    for (const char* fileName : fileNames) {
-        for (const auto& path : audio_get_configuration_paths()) {
-            snprintf(audioPolicyXmlConfigFile, sizeof(audioPolicyXmlConfigFile),
-                     "%s/%s", path.c_str(), fileName);
-            ret = deserializeAudioPolicyFile(audioPolicyXmlConfigFile, &config);
-            if (ret == NO_ERROR) {
-                config.setSource(audioPolicyXmlConfigFile);
-                return ret;
-            }
-        }
-    }
-    return ret;
+    return BAD_VALUE;
 }
 
 AudioPolicyManager::AudioPolicyManager(AudioPolicyClientInterface *clientInterface,
diff --git a/services/audiopolicy/tests/audiopolicymanager_tests.cpp b/services/audiopolicy/tests/audiopolicymanager_tests.cpp
index ca2164b..7972dbf 100644
--- a/services/audiopolicy/tests/audiopolicymanager_tests.cpp
+++ b/services/audiopolicy/tests/audiopolicymanager_tests.cpp
@@ -58,6 +58,34 @@
     ASSERT_EQ(NO_INIT, manager.initCheck());
 }
 
+// Verifies that a failure while loading a config doesn't leave
+// APM config in a "dirty" state. Since AudioPolicyConfig object
+// is a proxy for the data hosted by APM, it isn't possible
+// to "deep copy" it, and thus we have to test its elements
+// individually.
+TEST(AudioPolicyManagerTestInit, ConfigLoadingIsTransactional) {
+    AudioPolicyTestClient client;
+    AudioPolicyTestManager manager(&client);
+    ASSERT_TRUE(manager.getConfig().getHwModules().isEmpty());
+    ASSERT_TRUE(manager.getConfig().getInputDevices().isEmpty());
+    ASSERT_TRUE(manager.getConfig().getOutputDevices().isEmpty());
+    status_t status = deserializeAudioPolicyFile(
+            (base::GetExecutableDirectory() +
+                    "/test_invalid_audio_policy_configuration.xml").c_str(),
+            &manager.getConfig());
+    ASSERT_NE(NO_ERROR, status);
+    EXPECT_TRUE(manager.getConfig().getHwModules().isEmpty());
+    EXPECT_TRUE(manager.getConfig().getInputDevices().isEmpty());
+    EXPECT_TRUE(manager.getConfig().getOutputDevices().isEmpty());
+    status = deserializeAudioPolicyFile(
+            (base::GetExecutableDirectory() + "/test_audio_policy_configuration.xml").c_str(),
+            &manager.getConfig());
+    ASSERT_EQ(NO_ERROR, status);
+    EXPECT_FALSE(manager.getConfig().getHwModules().isEmpty());
+    EXPECT_FALSE(manager.getConfig().getInputDevices().isEmpty());
+    EXPECT_FALSE(manager.getConfig().getOutputDevices().isEmpty());
+}
+
 
 class PatchCountCheck {
   public:
diff --git a/services/audiopolicy/tests/resources/Android.bp b/services/audiopolicy/tests/resources/Android.bp
index d9476d9..4f50dad 100644
--- a/services/audiopolicy/tests/resources/Android.bp
+++ b/services/audiopolicy/tests/resources/Android.bp
@@ -3,6 +3,7 @@
     srcs: [
         "test_audio_policy_configuration.xml",
         "test_audio_policy_primary_only_configuration.xml",
+        "test_invalid_audio_policy_configuration.xml",
         "test_tv_apm_configuration.xml",
     ],
 }
diff --git a/services/audiopolicy/tests/resources/test_invalid_audio_policy_configuration.xml b/services/audiopolicy/tests/resources/test_invalid_audio_policy_configuration.xml
new file mode 100644
index 0000000..25641d5
--- /dev/null
+++ b/services/audiopolicy/tests/resources/test_invalid_audio_policy_configuration.xml
@@ -0,0 +1,113 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<!-- Copyright (C) 2020 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+
+<!-- This file contains an unnamed device port in the "r_submix" module section. -->
+<audioPolicyConfiguration version="1.0" xmlns:xi="http://www.w3.org/2001/XInclude">
+    <globalConfiguration speaker_drc_enabled="true"/>
+
+    <modules>
+        <!-- Primary module -->
+        <module name="primary" halVersion="2.0">
+            <attachedDevices>
+                <item>Speaker</item>
+                <item>Built-In Mic</item>
+            </attachedDevices>
+            <defaultOutputDevice>Speaker</defaultOutputDevice>
+            <mixPorts>
+                <mixPort name="primary output" role="source" flags="AUDIO_OUTPUT_FLAG_PRIMARY">
+                    <profile name="" format="AUDIO_FORMAT_PCM_16_BIT"
+                             samplingRates="48000" channelMasks="AUDIO_CHANNEL_OUT_STEREO"/>
+                </mixPort>
+                <mixPort name="primary input" role="sink">
+                    <profile name="" format="AUDIO_FORMAT_PCM_16_BIT"
+                             samplingRates="48000"
+                             channelMasks="AUDIO_CHANNEL_IN_STEREO"/>
+                </mixPort>
+                <mixPort name="mixport_bt_hfp_output" role="source">
+                    <profile name="" format="AUDIO_FORMAT_PCM_16_BIT"
+                             samplingRates="48000" channelMasks="AUDIO_CHANNEL_OUT_STEREO"/>
+                </mixPort>
+                <mixPort name="mixport_bt_hfp_input" role="sink">
+                    <profile name="" format="AUDIO_FORMAT_PCM_16_BIT"
+                             samplingRates="8000,11025,16000,44100,48000"
+                             channelMasks="AUDIO_CHANNEL_IN_STEREO,AUDIO_CHANNEL_IN_MONO"/>
+                </mixPort>
+            </mixPorts>
+            <devicePorts>
+                <devicePort tagName="Speaker" type="AUDIO_DEVICE_OUT_SPEAKER" role="sink">
+                </devicePort>
+                <devicePort tagName="Built-In Mic" type="AUDIO_DEVICE_IN_BUILTIN_MIC" role="source">
+                </devicePort>
+                <devicePort tagName="Hdmi" type="AUDIO_DEVICE_OUT_HDMI" role="sink">
+                </devicePort>
+                <devicePort tagName="Hdmi-In Mic" type="AUDIO_DEVICE_IN_HDMI" role="source">
+                </devicePort>
+                <devicePort tagName="BT SCO" type="AUDIO_DEVICE_OUT_BLUETOOTH_SCO"
+                            role="sink" address="hfp_client_out">
+                </devicePort>
+                <devicePort tagName="BT SCO Headset Mic" type="AUDIO_DEVICE_IN_BLUETOOTH_SCO_HEADSET"
+                            role="source" address="hfp_client_in">
+                </devicePort>
+            </devicePorts>
+            <routes>
+                <route type="mix" sink="Speaker"
+                       sources="primary output"/>
+                <route type="mix" sink="primary input"
+                       sources="Built-In Mic,Hdmi-In Mic"/>
+                <route type="mix" sink="Hdmi"
+                       sources="primary output"/>
+                <route type="mix" sink="BT SCO"
+                       sources="mixport_bt_hfp_output"/>
+                <route type="mix" sink="mixport_bt_hfp_input"
+                       sources="BT SCO Headset Mic"/>
+            </routes>
+        </module>
+
+        <!-- Remote Submix module -->
+        <module name="r_submix" halVersion="2.0">
+            <attachedDevices>
+                <item>Remote Submix In</item>
+            </attachedDevices>
+            <mixPorts>
+                <mixPort name="r_submix output" role="source">
+                    <profile name="" format="AUDIO_FORMAT_PCM_16_BIT"
+                             samplingRates="48000" channelMasks="AUDIO_CHANNEL_OUT_STEREO"/>
+                </mixPort>
+                <mixPort name="r_submix input" role="sink">
+                   <profile name="" format="AUDIO_FORMAT_PCM_16_BIT"
+                            samplingRates="48000" channelMasks="AUDIO_CHANNEL_IN_STEREO"/>
+                </mixPort>
+           </mixPorts>
+           <devicePorts>
+               <!-- This port is missing "tagName" attribute. -->
+               <devicePort type="AUDIO_DEVICE_OUT_REMOTE_SUBMIX"  role="sink">
+                   <profile name="" format="AUDIO_FORMAT_PCM_16_BIT"
+                            samplingRates="48000" channelMasks="AUDIO_CHANNEL_OUT_STEREO"/>
+               </devicePort>
+               <devicePort tagName="Remote Submix In" type="AUDIO_DEVICE_IN_REMOTE_SUBMIX"  role="source">
+                   <profile name="" format="AUDIO_FORMAT_PCM_16_BIT"
+                            samplingRates="48000" channelMasks="AUDIO_CHANNEL_IN_STEREO"/>
+                </devicePort>
+            </devicePorts>
+            <routes>
+                <route type="mix" sink="Remote Submix Out"
+                       sources="r_submix output"/>
+                <route type="mix" sink="r_submix input"
+                       sources="Remote Submix In"/>
+            </routes>
+        </module>
+    </modules>
+</audioPolicyConfiguration>