diff --git a/bluetooth/audio/utils/Android.bp b/bluetooth/audio/utils/Android.bp
index 4f712bf..974357e 100644
--- a/bluetooth/audio/utils/Android.bp
+++ b/bluetooth/audio/utils/Android.bp
@@ -32,5 +32,30 @@
         "libhidlbase",
         "liblog",
         "libutils",
+        "libbluetooth_audio_session_aidl",
+    ],
+}
+
+cc_library_shared {
+    name: "libbluetooth_audio_session_aidl",
+    vendor: true,
+    srcs: [
+        "aidl_session/BluetoothAudioCodecs.cpp",
+        "aidl_session/BluetoothAudioSession.cpp",
+        "aidl_session/HidlToAidlMiddleware.cpp",
+    ],
+    export_include_dirs: ["aidl_session/"],
+    header_libs: ["libhardware_headers"],
+    shared_libs: [
+        "android.hardware.bluetooth.audio@2.0",
+        "android.hardware.bluetooth.audio@2.1",
+        "android.hardware.bluetooth.audio@2.2",
+        "libbase",
+        "libcutils",
+        "libbinder_ndk",
+        "libfmq",
+        "liblog",
+        "android.hardware.bluetooth.audio-V1-ndk",
+        "libhidlbase",
     ],
 }
diff --git a/bluetooth/audio/utils/aidl_session/BluetoothAudioCodecs.cpp b/bluetooth/audio/utils/aidl_session/BluetoothAudioCodecs.cpp
new file mode 100644
index 0000000..92cd0f5
--- /dev/null
+++ b/bluetooth/audio/utils/aidl_session/BluetoothAudioCodecs.cpp
@@ -0,0 +1,489 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "BTAudioCodecsAidl"
+
+#include "BluetoothAudioCodecs.h"
+
+#include <aidl/android/hardware/bluetooth/audio/AacCapabilities.h>
+#include <aidl/android/hardware/bluetooth/audio/AacObjectType.h>
+#include <aidl/android/hardware/bluetooth/audio/AptxCapabilities.h>
+#include <aidl/android/hardware/bluetooth/audio/ChannelMode.h>
+#include <aidl/android/hardware/bluetooth/audio/LdacCapabilities.h>
+#include <aidl/android/hardware/bluetooth/audio/LdacChannelMode.h>
+#include <aidl/android/hardware/bluetooth/audio/LdacQualityIndex.h>
+#include <aidl/android/hardware/bluetooth/audio/LeAudioConfiguration.h>
+#include <aidl/android/hardware/bluetooth/audio/SbcCapabilities.h>
+#include <aidl/android/hardware/bluetooth/audio/SbcChannelMode.h>
+#include <android-base/logging.h>
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace bluetooth {
+namespace audio {
+
+static const PcmCapabilities kDefaultSoftwarePcmCapabilities = {
+    .sampleRateHz = {16000, 24000, 44100, 48000, 88200, 96000},
+    .channelMode = {ChannelMode::MONO, ChannelMode::STEREO},
+    .bitsPerSample = {16, 24, 32},
+    .dataIntervalUs = {},
+};
+
+static const SbcCapabilities kDefaultOffloadSbcCapability = {
+    .sampleRateHz = {44100},
+    .channelMode = {SbcChannelMode::MONO, SbcChannelMode::JOINT_STEREO},
+    .blockLength = {4, 8, 12, 16},
+    .numSubbands = {8},
+    .allocMethod = {SbcAllocMethod::ALLOC_MD_L},
+    .bitsPerSample = {16},
+    .minBitpool = 2,
+    .maxBitpool = 53};
+
+static const AacCapabilities kDefaultOffloadAacCapability = {
+    .objectType = {AacObjectType::MPEG2_LC},
+    .sampleRateHz = {44100},
+    .channelMode = {ChannelMode::STEREO},
+    .variableBitRateSupported = true,
+    .bitsPerSample = {16}};
+
+static const LdacCapabilities kDefaultOffloadLdacCapability = {
+    .sampleRateHz = {44100, 48000, 88200, 96000},
+    .channelMode = {LdacChannelMode::DUAL, LdacChannelMode::STEREO},
+    .qualityIndex = {LdacQualityIndex::HIGH},
+    .bitsPerSample = {16, 24, 32}};
+
+static const AptxCapabilities kDefaultOffloadAptxCapability = {
+    .sampleRateHz = {44100, 48000},
+    .channelMode = {ChannelMode::STEREO},
+    .bitsPerSample = {16},
+};
+
+static const AptxCapabilities kDefaultOffloadAptxHdCapability = {
+    .sampleRateHz = {44100, 48000},
+    .channelMode = {ChannelMode::STEREO},
+    .bitsPerSample = {24},
+};
+
+static const Lc3Capabilities kDefaultOffloadLc3Capability = {
+    .samplingFrequencyHz = {44100, 48000},
+    .frameDurationUs = {7500, 10000},
+    .channelMode = {ChannelMode::MONO, ChannelMode::STEREO},
+};
+
+const std::vector<CodecCapabilities> kDefaultOffloadA2dpCodecCapabilities = {
+    {.codecType = CodecType::SBC, .capabilities = {}},
+    {.codecType = CodecType::AAC, .capabilities = {}},
+    {.codecType = CodecType::LDAC, .capabilities = {}},
+    {.codecType = CodecType::APTX, .capabilities = {}},
+    {.codecType = CodecType::APTX_HD, .capabilities = {}},
+    {.codecType = CodecType::LC3, .capabilities = {}}};
+
+std::vector<LeAudioCodecCapabilitiesSetting> kDefaultOffloadLeAudioCapabilities;
+
+static const UnicastCapability kInvalidUnicastCapability = {
+    .codecType = CodecType::UNKNOWN};
+
+static const BroadcastCapability kInvalidBroadcastCapability = {
+    .codecType = CodecType::UNKNOWN};
+
+// Default Supported Codecs
+// LC3 16_1: sample rate: 16 kHz, frame duration: 7.5 ms, octets per frame: 30
+static const Lc3Capabilities kLc3Capability_16_1 = {
+    .samplingFrequencyHz = {16000},
+    .frameDurationUs = {7500},
+    .octetsPerFrame = {30}};
+
+// Default Supported Codecs
+// LC3 16_2: sample rate: 16 kHz, frame duration: 10 ms, octets per frame: 40
+static const Lc3Capabilities kLc3Capability_16_2 = {
+    .samplingFrequencyHz = {16000},
+    .frameDurationUs = {10000},
+    .octetsPerFrame = {40}};
+
+// Default Supported Codecs
+// LC3 48_4: sample rate: 48 kHz, frame duration: 10 ms, octets per frame: 120
+static const Lc3Capabilities kLc3Capability_48_4 = {
+    .samplingFrequencyHz = {48000},
+    .frameDurationUs = {10000},
+    .octetsPerFrame = {120}};
+
+static const std::vector<Lc3Capabilities> supportedLc3CapabilityList = {
+    kLc3Capability_48_4, kLc3Capability_16_2, kLc3Capability_16_1};
+
+static AudioLocation stereoAudio = static_cast<AudioLocation>(
+    static_cast<uint8_t>(AudioLocation::FRONT_LEFT) |
+    static_cast<uint8_t>(AudioLocation::FRONT_RIGHT));
+static AudioLocation monoAudio = AudioLocation::UNKNOWN;
+
+// Stores the supported setting of audio location, connected device, and the
+// channel count for each device
+std::vector<std::tuple<AudioLocation, uint8_t, uint8_t>>
+    supportedDeviceSetting = {std::make_tuple(stereoAudio, 2, 1),
+                              std::make_tuple(monoAudio, 1, 2),
+                              std::make_tuple(monoAudio, 1, 1)};
+
+template <class T>
+bool BluetoothAudioCodecs::ContainedInVector(
+    const std::vector<T>& vector, const typename identity<T>::type& target) {
+  return std::find(vector.begin(), vector.end(), target) != vector.end();
+}
+
+bool BluetoothAudioCodecs::IsOffloadSbcConfigurationValid(
+    const CodecConfiguration::CodecSpecific& codec_specific) {
+  if (codec_specific.getTag() != CodecConfiguration::CodecSpecific::sbcConfig) {
+    LOG(WARNING) << __func__
+                 << ": Invalid CodecSpecific=" << codec_specific.toString();
+    return false;
+  }
+  const SbcConfiguration sbc_data =
+      codec_specific.get<CodecConfiguration::CodecSpecific::sbcConfig>();
+
+  if (ContainedInVector(kDefaultOffloadSbcCapability.sampleRateHz,
+                        sbc_data.sampleRateHz) &&
+      ContainedInVector(kDefaultOffloadSbcCapability.blockLength,
+                        sbc_data.blockLength) &&
+      ContainedInVector(kDefaultOffloadSbcCapability.numSubbands,
+                        sbc_data.numSubbands) &&
+      ContainedInVector(kDefaultOffloadSbcCapability.bitsPerSample,
+                        sbc_data.bitsPerSample) &&
+      ContainedInVector(kDefaultOffloadSbcCapability.channelMode,
+                        sbc_data.channelMode) &&
+      ContainedInVector(kDefaultOffloadSbcCapability.allocMethod,
+                        sbc_data.allocMethod) &&
+      sbc_data.minBitpool <= sbc_data.maxBitpool &&
+      kDefaultOffloadSbcCapability.minBitpool <= sbc_data.minBitpool &&
+      kDefaultOffloadSbcCapability.maxBitpool >= sbc_data.maxBitpool) {
+    return true;
+  }
+  LOG(WARNING) << __func__
+               << ": Unsupported CodecSpecific=" << codec_specific.toString();
+  return false;
+}
+
+bool BluetoothAudioCodecs::IsOffloadAacConfigurationValid(
+    const CodecConfiguration::CodecSpecific& codec_specific) {
+  if (codec_specific.getTag() != CodecConfiguration::CodecSpecific::aacConfig) {
+    LOG(WARNING) << __func__
+                 << ": Invalid CodecSpecific=" << codec_specific.toString();
+    return false;
+  }
+  const AacConfiguration aac_data =
+      codec_specific.get<CodecConfiguration::CodecSpecific::aacConfig>();
+
+  if (ContainedInVector(kDefaultOffloadAacCapability.sampleRateHz,
+                        aac_data.sampleRateHz) &&
+      ContainedInVector(kDefaultOffloadAacCapability.bitsPerSample,
+                        aac_data.bitsPerSample) &&
+      ContainedInVector(kDefaultOffloadAacCapability.channelMode,
+                        aac_data.channelMode) &&
+      ContainedInVector(kDefaultOffloadAacCapability.objectType,
+                        aac_data.objectType) &&
+      (!aac_data.variableBitRateEnabled ||
+       kDefaultOffloadAacCapability.variableBitRateSupported)) {
+    return true;
+  }
+  LOG(WARNING) << __func__
+               << ": Unsupported CodecSpecific=" << codec_specific.toString();
+  return false;
+}
+
+bool BluetoothAudioCodecs::IsOffloadLdacConfigurationValid(
+    const CodecConfiguration::CodecSpecific& codec_specific) {
+  if (codec_specific.getTag() !=
+      CodecConfiguration::CodecSpecific::ldacConfig) {
+    LOG(WARNING) << __func__
+                 << ": Invalid CodecSpecific=" << codec_specific.toString();
+    return false;
+  }
+  const LdacConfiguration ldac_data =
+      codec_specific.get<CodecConfiguration::CodecSpecific::ldacConfig>();
+
+  if (ContainedInVector(kDefaultOffloadLdacCapability.sampleRateHz,
+                        ldac_data.sampleRateHz) &&
+      ContainedInVector(kDefaultOffloadLdacCapability.bitsPerSample,
+                        ldac_data.bitsPerSample) &&
+      ContainedInVector(kDefaultOffloadLdacCapability.channelMode,
+                        ldac_data.channelMode) &&
+      ContainedInVector(kDefaultOffloadLdacCapability.qualityIndex,
+                        ldac_data.qualityIndex)) {
+    return true;
+  }
+  LOG(WARNING) << __func__
+               << ": Unsupported CodecSpecific=" << codec_specific.toString();
+  return false;
+}
+
+bool BluetoothAudioCodecs::IsOffloadAptxConfigurationValid(
+    const CodecConfiguration::CodecSpecific& codec_specific) {
+  if (codec_specific.getTag() !=
+      CodecConfiguration::CodecSpecific::aptxConfig) {
+    LOG(WARNING) << __func__
+                 << ": Invalid CodecSpecific=" << codec_specific.toString();
+    return false;
+  }
+  const AptxConfiguration aptx_data =
+      codec_specific.get<CodecConfiguration::CodecSpecific::aptxConfig>();
+
+  if (ContainedInVector(kDefaultOffloadAptxCapability.sampleRateHz,
+                        aptx_data.sampleRateHz) &&
+      ContainedInVector(kDefaultOffloadAptxCapability.bitsPerSample,
+                        aptx_data.bitsPerSample) &&
+      ContainedInVector(kDefaultOffloadAptxCapability.channelMode,
+                        aptx_data.channelMode)) {
+    return true;
+  }
+  LOG(WARNING) << __func__
+               << ": Unsupported CodecSpecific=" << codec_specific.toString();
+  return false;
+}
+
+bool BluetoothAudioCodecs::IsOffloadAptxHdConfigurationValid(
+    const CodecConfiguration::CodecSpecific& codec_specific) {
+  if (codec_specific.getTag() !=
+      CodecConfiguration::CodecSpecific::aptxConfig) {
+    LOG(WARNING) << __func__
+                 << ": Invalid CodecSpecific=" << codec_specific.toString();
+    return false;
+  }
+  const AptxConfiguration aptx_data =
+      codec_specific.get<CodecConfiguration::CodecSpecific::aptxConfig>();
+
+  if (ContainedInVector(kDefaultOffloadAptxHdCapability.sampleRateHz,
+                        aptx_data.sampleRateHz) &&
+      ContainedInVector(kDefaultOffloadAptxHdCapability.bitsPerSample,
+                        aptx_data.bitsPerSample) &&
+      ContainedInVector(kDefaultOffloadAptxHdCapability.channelMode,
+                        aptx_data.channelMode)) {
+    return true;
+  }
+  LOG(WARNING) << __func__
+               << ": Unsupported CodecSpecific=" << codec_specific.toString();
+  return false;
+}
+
+bool BluetoothAudioCodecs::IsOffloadLc3ConfigurationValid(
+    const CodecConfiguration::CodecSpecific& codec_specific) {
+  if (codec_specific.getTag() != CodecConfiguration::CodecSpecific::lc3Config) {
+    LOG(WARNING) << __func__
+                 << ": Invalid CodecSpecific=" << codec_specific.toString();
+    return false;
+  }
+  const Lc3Configuration lc3_data =
+      codec_specific.get<CodecConfiguration::CodecSpecific::lc3Config>();
+
+  if (ContainedInVector(kDefaultOffloadLc3Capability.samplingFrequencyHz,
+                        lc3_data.samplingFrequencyHz) &&
+      ContainedInVector(kDefaultOffloadLc3Capability.frameDurationUs,
+                        lc3_data.frameDurationUs) &&
+      ContainedInVector(kDefaultOffloadLc3Capability.channelMode,
+                        lc3_data.channelMode)) {
+    return true;
+  }
+  LOG(WARNING) << __func__
+               << ": Unsupported CodecSpecific=" << codec_specific.toString();
+  return false;
+}
+
+bool BluetoothAudioCodecs::IsOffloadLeAudioConfigurationValid(
+    const SessionType& session_type, const LeAudioConfiguration&) {
+  if (session_type !=
+          SessionType::LE_AUDIO_HARDWARE_OFFLOAD_ENCODING_DATAPATH &&
+      session_type !=
+          SessionType::LE_AUDIO_HARDWARE_OFFLOAD_DECODING_DATAPATH) {
+    return false;
+  }
+  return true;
+}
+
+std::vector<PcmCapabilities>
+BluetoothAudioCodecs::GetSoftwarePcmCapabilities() {
+  return {kDefaultSoftwarePcmCapabilities};
+}
+
+std::vector<CodecCapabilities>
+BluetoothAudioCodecs::GetA2dpOffloadCodecCapabilities(
+    const SessionType& session_type) {
+  if (session_type != SessionType::A2DP_HARDWARE_OFFLOAD_ENCODING_DATAPATH) {
+    return {};
+  }
+  std::vector<CodecCapabilities> offload_a2dp_codec_capabilities =
+      kDefaultOffloadA2dpCodecCapabilities;
+  for (auto& codec_capability : offload_a2dp_codec_capabilities) {
+    switch (codec_capability.codecType) {
+      case CodecType::SBC:
+        codec_capability.capabilities
+            .set<CodecCapabilities::Capabilities::sbcCapabilities>(
+                kDefaultOffloadSbcCapability);
+        break;
+      case CodecType::AAC:
+        codec_capability.capabilities
+            .set<CodecCapabilities::Capabilities::aacCapabilities>(
+                kDefaultOffloadAacCapability);
+        break;
+      case CodecType::LDAC:
+        codec_capability.capabilities
+            .set<CodecCapabilities::Capabilities::ldacCapabilities>(
+                kDefaultOffloadLdacCapability);
+        break;
+      case CodecType::APTX:
+        codec_capability.capabilities
+            .set<CodecCapabilities::Capabilities::aptxCapabilities>(
+                kDefaultOffloadAptxCapability);
+        break;
+      case CodecType::APTX_HD:
+        codec_capability.capabilities
+            .set<CodecCapabilities::Capabilities::aptxCapabilities>(
+                kDefaultOffloadAptxHdCapability);
+        break;
+      case CodecType::LC3:
+        codec_capability.capabilities
+            .set<CodecCapabilities::Capabilities::lc3Capabilities>(
+                kDefaultOffloadLc3Capability);
+        break;
+      case CodecType::UNKNOWN:
+        codec_capability = {};
+        break;
+    }
+  }
+  return offload_a2dp_codec_capabilities;
+}
+
+bool BluetoothAudioCodecs::IsSoftwarePcmConfigurationValid(
+    const PcmConfiguration& pcm_config) {
+  if (ContainedInVector(kDefaultSoftwarePcmCapabilities.sampleRateHz,
+                        pcm_config.sampleRateHz) &&
+      ContainedInVector(kDefaultSoftwarePcmCapabilities.bitsPerSample,
+                        pcm_config.bitsPerSample) &&
+      ContainedInVector(kDefaultSoftwarePcmCapabilities.channelMode,
+                        pcm_config.channelMode)
+      // data interval is not checked for now
+      // && pcm_config.dataIntervalUs != 0
+  ) {
+    return true;
+  }
+  LOG(WARNING) << __func__
+               << ": Unsupported CodecSpecific=" << pcm_config.toString();
+  return false;
+}
+
+bool BluetoothAudioCodecs::IsOffloadCodecConfigurationValid(
+    const SessionType& session_type, const CodecConfiguration& codec_config) {
+  if (session_type != SessionType::A2DP_HARDWARE_OFFLOAD_ENCODING_DATAPATH) {
+    LOG(ERROR) << __func__
+               << ": Invalid SessionType=" << toString(session_type);
+    return false;
+  }
+  const CodecConfiguration::CodecSpecific& codec_specific = codec_config.config;
+  switch (codec_config.codecType) {
+    case CodecType::SBC:
+      if (IsOffloadSbcConfigurationValid(codec_specific)) {
+        return true;
+      }
+      break;
+    case CodecType::AAC:
+      if (IsOffloadAacConfigurationValid(codec_specific)) {
+        return true;
+      }
+      break;
+    case CodecType::LDAC:
+      if (IsOffloadLdacConfigurationValid(codec_specific)) {
+        return true;
+      }
+      break;
+    case CodecType::APTX:
+      if (IsOffloadAptxConfigurationValid(codec_specific)) {
+        return true;
+      }
+      break;
+    case CodecType::APTX_HD:
+      if (IsOffloadAptxHdConfigurationValid(codec_specific)) {
+        return true;
+      }
+      break;
+    case CodecType::LC3:
+      if (IsOffloadLc3ConfigurationValid(codec_specific)) {
+        return true;
+      }
+      break;
+    case CodecType::UNKNOWN:
+      break;
+  }
+  return false;
+}
+
+UnicastCapability composeUnicastLc3Capability(
+    AudioLocation audioLocation, uint8_t deviceCnt, uint8_t channelCount,
+    const Lc3Capabilities& capability) {
+  return {
+      .codecType = CodecType::LC3,
+      .supportedChannel = audioLocation,
+      .deviceCount = deviceCnt,
+      .channelCountPerDevice = channelCount,
+      .leAudioCodecCapabilities =
+          UnicastCapability::LeAudioCodecCapabilities(capability),
+  };
+}
+
+std::vector<LeAudioCodecCapabilitiesSetting>
+BluetoothAudioCodecs::GetLeAudioOffloadCodecCapabilities(
+    const SessionType& session_type) {
+  if (session_type !=
+          SessionType::LE_AUDIO_HARDWARE_OFFLOAD_ENCODING_DATAPATH &&
+      session_type !=
+          SessionType::LE_AUDIO_HARDWARE_OFFLOAD_DECODING_DATAPATH) {
+    return std::vector<LeAudioCodecCapabilitiesSetting>(0);
+  }
+
+  if (kDefaultOffloadLeAudioCapabilities.empty()) {
+    for (auto [audioLocation, deviceCnt, channelCount] :
+         supportedDeviceSetting) {
+      for (auto capability : supportedLc3CapabilityList) {
+        UnicastCapability lc3Capability = composeUnicastLc3Capability(
+            audioLocation, deviceCnt, channelCount, capability);
+        UnicastCapability lc3MonoDecodeCapability =
+            composeUnicastLc3Capability(monoAudio, 1, 1, capability);
+
+        // Adds the capability for encode only
+        kDefaultOffloadLeAudioCapabilities.push_back(
+            {.unicastEncodeCapability = lc3Capability,
+             .unicastDecodeCapability = kInvalidUnicastCapability,
+             .broadcastCapability = kInvalidBroadcastCapability});
+
+        // Adds the capability for decode only
+        kDefaultOffloadLeAudioCapabilities.push_back(
+            {.unicastEncodeCapability = kInvalidUnicastCapability,
+             .unicastDecodeCapability = lc3Capability,
+             .broadcastCapability = kInvalidBroadcastCapability});
+
+        // Adds the capability for the case that encode and decode exist at the
+        // same time
+        kDefaultOffloadLeAudioCapabilities.push_back(
+            {.unicastEncodeCapability = lc3Capability,
+             .unicastDecodeCapability = lc3MonoDecodeCapability,
+             .broadcastCapability = kInvalidBroadcastCapability});
+      }
+    }
+  }
+
+  return kDefaultOffloadLeAudioCapabilities;
+}
+
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace hardware
+}  // namespace android
+}  // namespace aidl
\ No newline at end of file
diff --git a/bluetooth/audio/utils/aidl_session/BluetoothAudioCodecs.h b/bluetooth/audio/utils/aidl_session/BluetoothAudioCodecs.h
new file mode 100644
index 0000000..c542ce5
--- /dev/null
+++ b/bluetooth/audio/utils/aidl_session/BluetoothAudioCodecs.h
@@ -0,0 +1,88 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <aidl/android/hardware/bluetooth/audio/CodecCapabilities.h>
+#include <aidl/android/hardware/bluetooth/audio/CodecConfiguration.h>
+#include <aidl/android/hardware/bluetooth/audio/Lc3Configuration.h>
+#include <aidl/android/hardware/bluetooth/audio/LeAudioCodecCapabilitiesSetting.h>
+#include <aidl/android/hardware/bluetooth/audio/LeAudioConfiguration.h>
+#include <aidl/android/hardware/bluetooth/audio/PcmCapabilities.h>
+#include <aidl/android/hardware/bluetooth/audio/PcmConfiguration.h>
+#include <aidl/android/hardware/bluetooth/audio/SessionType.h>
+
+#include <vector>
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace bluetooth {
+namespace audio {
+
+class BluetoothAudioCodecs {
+ public:
+  static std::vector<PcmCapabilities> GetSoftwarePcmCapabilities();
+  static std::vector<CodecCapabilities> GetA2dpOffloadCodecCapabilities(
+      const SessionType& session_type);
+
+  static bool IsSoftwarePcmConfigurationValid(
+      const PcmConfiguration& pcm_config);
+  static bool IsOffloadCodecConfigurationValid(
+      const SessionType& session_type, const CodecConfiguration& codec_config);
+
+  static bool IsOffloadLeAudioConfigurationValid(
+      const SessionType& session_type, const Lc3Configuration& codec_config);
+
+  static bool IsOffloadLeAudioConfigurationValid(
+      const SessionType& session_type,
+      const LeAudioConfiguration& codec_config);
+
+  static std::vector<LeAudioCodecCapabilitiesSetting>
+  GetLeAudioOffloadCodecCapabilities(const SessionType& session_type);
+
+ private:
+  template <typename T>
+  struct identity {
+    typedef T type;
+  };
+  template <class T>
+  static bool ContainedInVector(const std::vector<T>& vector,
+                                const typename identity<T>::type& target);
+  template <class T>
+  static bool ContainedInBitmask(const T& bitmask, const T& target);
+  static bool IsSingleBit(uint32_t bitmasks, uint32_t bitfield);
+  static bool IsOffloadSbcConfigurationValid(
+      const CodecConfiguration::CodecSpecific& codec_specific);
+  static bool IsOffloadAacConfigurationValid(
+      const CodecConfiguration::CodecSpecific& codec_specific);
+  static bool IsOffloadLdacConfigurationValid(
+      const CodecConfiguration::CodecSpecific& codec_specific);
+  static bool IsOffloadAptxConfigurationValid(
+      const CodecConfiguration::CodecSpecific& codec_specific);
+  static bool IsOffloadAptxHdConfigurationValid(
+      const CodecConfiguration::CodecSpecific& codec_specific);
+  static bool IsOffloadLc3ConfigurationValid(
+      const CodecConfiguration::CodecSpecific& codec_specific);
+  static bool IsOffloadLeAudioConfigurationValid(
+      const SessionType& session_type, const LeAudioCodecConfiguration&);
+};
+
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace hardware
+}  // namespace android
+}  // namespace aidl
diff --git a/bluetooth/audio/utils/aidl_session/BluetoothAudioSession.cpp b/bluetooth/audio/utils/aidl_session/BluetoothAudioSession.cpp
new file mode 100644
index 0000000..95e473e
--- /dev/null
+++ b/bluetooth/audio/utils/aidl_session/BluetoothAudioSession.cpp
@@ -0,0 +1,581 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <sys/types.h>
+#define LOG_TAG "BTAudioSessionAidl"
+
+#include <android-base/logging.h>
+#include <android-base/stringprintf.h>
+#include <android/binder_manager.h>
+
+#include "BluetoothAudioSession.h"
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace bluetooth {
+namespace audio {
+
+static constexpr int kFmqSendTimeoutMs = 1000;  // 1000 ms timeout for sending
+static constexpr int kFmqReceiveTimeoutMs =
+    1000;                               // 1000 ms timeout for receiving
+static constexpr int kWritePollMs = 1;  // polled non-blocking interval
+static constexpr int kReadPollMs = 1;   // polled non-blocking interval
+
+const CodecConfiguration BluetoothAudioSession::kInvalidCodecConfiguration = {};
+const LeAudioConfiguration kInvalidLeAudioConfiguration = {};
+AudioConfiguration BluetoothAudioSession::invalidSoftwareAudioConfiguration =
+    {};
+AudioConfiguration BluetoothAudioSession::invalidOffloadAudioConfiguration = {};
+AudioConfiguration BluetoothAudioSession::invalidLeOffloadAudioConfig = {};
+
+BluetoothAudioSession::BluetoothAudioSession(const SessionType& session_type)
+    : session_type_(session_type), stack_iface_(nullptr), data_mq_(nullptr) {
+  invalidSoftwareAudioConfiguration.set<AudioConfiguration::pcmConfig>(
+      kInvalidPcmConfiguration);
+  invalidOffloadAudioConfiguration.set<AudioConfiguration::a2dpConfig>(
+      kInvalidCodecConfiguration);
+  invalidLeOffloadAudioConfig.set<AudioConfiguration::leAudioConfig>(
+      kInvalidLeAudioConfiguration);
+}
+
+/***
+ *
+ * Callback methods
+ *
+ ***/
+
+void BluetoothAudioSession::OnSessionStarted(
+    const std::shared_ptr<IBluetoothAudioPort> stack_iface,
+    const DataMQDesc* mq_desc, const AudioConfiguration& audio_config) {
+  std::lock_guard<std::recursive_mutex> guard(mutex_);
+  if (stack_iface == nullptr) {
+    LOG(ERROR) << __func__ << " - SessionType=" << toString(session_type_)
+               << ", IBluetoothAudioPort Invalid";
+  } else if (!UpdateAudioConfig(audio_config)) {
+    LOG(ERROR) << __func__ << " - SessionType=" << toString(session_type_)
+               << ", AudioConfiguration=" << audio_config.toString()
+               << " Invalid";
+  } else if (!UpdateDataPath(mq_desc)) {
+    LOG(ERROR) << __func__ << " - SessionType=" << toString(session_type_)
+               << " MqDescriptor Invalid";
+    if (session_type_ == SessionType::A2DP_HARDWARE_OFFLOAD_ENCODING_DATAPATH) {
+      audio_config_ = std::make_unique<AudioConfiguration>(
+          invalidOffloadAudioConfiguration);
+    } else {
+      audio_config_ = std::make_unique<AudioConfiguration>(
+          invalidSoftwareAudioConfiguration);
+    }
+  } else {
+    stack_iface_ = stack_iface;
+    LOG(INFO) << __func__ << " - SessionType=" << toString(session_type_)
+              << ", AudioConfiguration=" << audio_config.toString();
+    ReportSessionStatus();
+  }
+}
+
+void BluetoothAudioSession::OnSessionEnded() {
+  std::lock_guard<std::recursive_mutex> guard(mutex_);
+  bool toggled = IsSessionReady();
+  LOG(INFO) << __func__ << " - SessionType=" << toString(session_type_);
+  if (session_type_ == SessionType::A2DP_HARDWARE_OFFLOAD_ENCODING_DATAPATH) {
+    audio_config_ =
+        std::make_unique<AudioConfiguration>(invalidOffloadAudioConfiguration);
+  } else {
+    audio_config_ =
+        std::make_unique<AudioConfiguration>(invalidSoftwareAudioConfiguration);
+  }
+  stack_iface_ = nullptr;
+  UpdateDataPath(nullptr);
+  if (toggled) {
+    ReportSessionStatus();
+  }
+}
+
+/***
+ *
+ * Util methods
+ *
+ ***/
+
+const AudioConfiguration& BluetoothAudioSession::GetAudioConfig() {
+  std::lock_guard<std::recursive_mutex> guard(mutex_);
+  if (!IsSessionReady()) {
+    if (session_type_ == SessionType::A2DP_HARDWARE_OFFLOAD_ENCODING_DATAPATH) {
+      return invalidOffloadAudioConfiguration;
+    } else {
+      return invalidSoftwareAudioConfiguration;
+    }
+    switch (session_type_) {
+      case SessionType::A2DP_HARDWARE_OFFLOAD_ENCODING_DATAPATH:
+        return invalidOffloadAudioConfiguration;
+      case SessionType::LE_AUDIO_HARDWARE_OFFLOAD_ENCODING_DATAPATH:
+      case SessionType::LE_AUDIO_HARDWARE_OFFLOAD_DECODING_DATAPATH:
+        return invalidLeOffloadAudioConfig;
+      default:
+        return invalidSoftwareAudioConfiguration;
+    }
+  }
+  return *audio_config_;
+}
+
+void BluetoothAudioSession::ReportAudioConfigChanged(
+    const AudioConfiguration& audio_config) {
+  if (session_type_ !=
+          SessionType::LE_AUDIO_HARDWARE_OFFLOAD_ENCODING_DATAPATH &&
+      session_type_ !=
+          SessionType::LE_AUDIO_HARDWARE_OFFLOAD_DECODING_DATAPATH) {
+    return;
+  }
+  std::lock_guard<std::recursive_mutex> guard(mutex_);
+  audio_config_ = std::make_unique<AudioConfiguration>(audio_config);
+  if (observers_.empty()) {
+    LOG(WARNING) << __func__ << " - SessionType=" << toString(session_type_)
+                 << " has NO port state observer";
+    return;
+  }
+  for (auto& observer : observers_) {
+    uint16_t cookie = observer.first;
+    std::shared_ptr<struct PortStatusCallbacks> cb = observer.second;
+    LOG(INFO) << __func__ << " for SessionType=" << toString(session_type_)
+              << ", bluetooth_audio=0x"
+              << ::android::base::StringPrintf("%04x", cookie);
+    if (cb->audio_configuration_changed_cb_ != nullptr) {
+      cb->audio_configuration_changed_cb_(cookie);
+    }
+  }
+}
+
+bool BluetoothAudioSession::IsSessionReady() {
+  std::lock_guard<std::recursive_mutex> guard(mutex_);
+
+  bool is_mq_valid =
+      (session_type_ == SessionType::A2DP_HARDWARE_OFFLOAD_ENCODING_DATAPATH ||
+       session_type_ ==
+           SessionType::LE_AUDIO_HARDWARE_OFFLOAD_ENCODING_DATAPATH ||
+       session_type_ ==
+           SessionType::LE_AUDIO_HARDWARE_OFFLOAD_DECODING_DATAPATH ||
+       (data_mq_ != nullptr && data_mq_->isValid()));
+  return stack_iface_ != nullptr && is_mq_valid;
+}
+
+/***
+ *
+ * Status callback methods
+ *
+ ***/
+
+uint16_t BluetoothAudioSession::RegisterStatusCback(
+    const PortStatusCallbacks& callbacks) {
+  std::lock_guard<std::recursive_mutex> guard(mutex_);
+  uint16_t cookie = ObserversCookieGetInitValue(session_type_);
+  uint16_t cookie_upper_bound = ObserversCookieGetUpperBound(session_type_);
+
+  while (cookie < cookie_upper_bound) {
+    if (observers_.find(cookie) == observers_.end()) {
+      break;
+    }
+    ++cookie;
+  }
+  if (cookie >= cookie_upper_bound) {
+    LOG(ERROR) << __func__ << " - SessionType=" << toString(session_type_)
+               << " has " << observers_.size()
+               << " observers already (No Resource)";
+    return kObserversCookieUndefined;
+  }
+  std::shared_ptr<PortStatusCallbacks> cb =
+      std::make_shared<PortStatusCallbacks>();
+  *cb = callbacks;
+  observers_[cookie] = cb;
+  return cookie;
+}
+
+void BluetoothAudioSession::UnregisterStatusCback(uint16_t cookie) {
+  std::lock_guard<std::recursive_mutex> guard(mutex_);
+  if (observers_.erase(cookie) != 1) {
+    LOG(WARNING) << __func__ << " - SessionType=" << toString(session_type_)
+                 << " no such provider=0x"
+                 << ::android::base::StringPrintf("%04x", cookie);
+  }
+}
+
+/***
+ *
+ * Stream methods
+ *
+ ***/
+
+bool BluetoothAudioSession::StartStream() {
+  std::lock_guard<std::recursive_mutex> guard(mutex_);
+  if (!IsSessionReady()) {
+    LOG(DEBUG) << __func__ << " - SessionType=" << toString(session_type_)
+               << " has NO session";
+    return false;
+  }
+  auto hal_retval = stack_iface_->startStream();
+  if (!hal_retval.isOk()) {
+    LOG(WARNING) << __func__ << " - IBluetoothAudioPort SessionType="
+                 << toString(session_type_) << " failed";
+    return false;
+  }
+  return true;
+}
+
+bool BluetoothAudioSession::SuspendStream() {
+  std::lock_guard<std::recursive_mutex> guard(mutex_);
+  if (!IsSessionReady()) {
+    LOG(DEBUG) << __func__ << " - SessionType=" << toString(session_type_)
+               << " has NO session";
+    return false;
+  }
+  auto hal_retval = stack_iface_->suspendStream();
+  if (!hal_retval.isOk()) {
+    LOG(WARNING) << __func__ << " - IBluetoothAudioPort SessionType="
+                 << toString(session_type_) << " failed";
+    return false;
+  }
+  return true;
+}
+
+void BluetoothAudioSession::StopStream() {
+  std::lock_guard<std::recursive_mutex> guard(mutex_);
+  if (!IsSessionReady()) {
+    return;
+  }
+  auto hal_retval = stack_iface_->stopStream();
+  if (!hal_retval.isOk()) {
+    LOG(WARNING) << __func__ << " - IBluetoothAudioPort SessionType="
+                 << toString(session_type_) << " failed";
+  }
+}
+
+/***
+ *
+ * Private methods
+ *
+ ***/
+
+bool BluetoothAudioSession::UpdateDataPath(const DataMQDesc* mq_desc) {
+  if (mq_desc == nullptr) {
+    // usecase of reset by nullptr
+    data_mq_ = nullptr;
+    return true;
+  }
+  std::unique_ptr<DataMQ> temp_mq;
+  temp_mq.reset(new DataMQ(*mq_desc));
+  if (!temp_mq || !temp_mq->isValid()) {
+    data_mq_ = nullptr;
+    return false;
+  }
+  data_mq_ = std::move(temp_mq);
+  return true;
+}
+
+bool BluetoothAudioSession::UpdateAudioConfig(
+    const AudioConfiguration& audio_config) {
+  bool is_software_session =
+      (session_type_ == SessionType::A2DP_SOFTWARE_ENCODING_DATAPATH ||
+       session_type_ == SessionType::HEARING_AID_SOFTWARE_ENCODING_DATAPATH ||
+       session_type_ == SessionType::LE_AUDIO_SOFTWARE_DECODING_DATAPATH ||
+       session_type_ == SessionType::LE_AUDIO_SOFTWARE_ENCODING_DATAPATH);
+  bool is_offload_a2dp_session =
+      (session_type_ == SessionType::A2DP_HARDWARE_OFFLOAD_ENCODING_DATAPATH);
+  bool is_offload_le_audio_session =
+      (session_type_ ==
+           SessionType::LE_AUDIO_HARDWARE_OFFLOAD_ENCODING_DATAPATH ||
+       session_type_ ==
+           SessionType::LE_AUDIO_HARDWARE_OFFLOAD_DECODING_DATAPATH);
+  auto audio_config_tag = audio_config.getTag();
+  bool is_software_audio_config =
+      (is_software_session &&
+       audio_config_tag == AudioConfiguration::pcmConfig);
+  bool is_a2dp_offload_audio_config =
+      (is_offload_a2dp_session &&
+       audio_config_tag == AudioConfiguration::a2dpConfig);
+  bool is_le_audio_offload_audio_config =
+      (is_offload_le_audio_session &&
+       audio_config_tag == AudioConfiguration::leAudioConfig);
+  if (!is_software_audio_config && !is_a2dp_offload_audio_config &&
+      !is_le_audio_offload_audio_config) {
+    return false;
+  }
+  audio_config_ = std::make_unique<AudioConfiguration>(audio_config);
+  return true;
+}
+
+void BluetoothAudioSession::ReportSessionStatus() {
+  // This is locked already by OnSessionStarted / OnSessionEnded
+  if (observers_.empty()) {
+    LOG(INFO) << __func__ << " - SessionType=" << toString(session_type_)
+              << " has NO port state observer";
+    return;
+  }
+  for (auto& observer : observers_) {
+    uint16_t cookie = observer.first;
+    std::shared_ptr<PortStatusCallbacks> callback = observer.second;
+    LOG(INFO) << __func__ << " - SessionType=" << toString(session_type_)
+              << " notify to bluetooth_audio=0x"
+              << ::android::base::StringPrintf("%04x", cookie);
+    callback->session_changed_cb_(cookie);
+  }
+}
+
+/***
+ *
+ * PCM methods
+ *
+ ***/
+
+size_t BluetoothAudioSession::OutWritePcmData(const void* buffer,
+                                              size_t bytes) {
+  if (buffer == nullptr || bytes <= 0) {
+    return 0;
+  }
+  size_t total_written = 0;
+  int timeout_ms = kFmqSendTimeoutMs;
+  do {
+    std::unique_lock<std::recursive_mutex> lock(mutex_);
+    if (!IsSessionReady()) {
+      break;
+    }
+    size_t num_bytes_to_write = data_mq_->availableToWrite();
+    if (num_bytes_to_write) {
+      if (num_bytes_to_write > (bytes - total_written)) {
+        num_bytes_to_write = bytes - total_written;
+      }
+
+      if (!data_mq_->write(
+              static_cast<const MQDataType*>(buffer) + total_written,
+              num_bytes_to_write)) {
+        LOG(ERROR) << "FMQ datapath writing " << total_written << "/" << bytes
+                   << " failed";
+        return total_written;
+      }
+      total_written += num_bytes_to_write;
+    } else if (timeout_ms >= kWritePollMs) {
+      lock.unlock();
+      usleep(kWritePollMs * 1000);
+      timeout_ms -= kWritePollMs;
+    } else {
+      LOG(DEBUG) << "Data " << total_written << "/" << bytes << " overflow "
+                 << (kFmqSendTimeoutMs - timeout_ms) << " ms";
+      return total_written;
+    }
+  } while (total_written < bytes);
+  return total_written;
+}
+
+size_t BluetoothAudioSession::InReadPcmData(void* buffer, size_t bytes) {
+  if (buffer == nullptr || bytes <= 0) {
+    return 0;
+  }
+  size_t total_read = 0;
+  int timeout_ms = kFmqReceiveTimeoutMs;
+  do {
+    std::unique_lock<std::recursive_mutex> lock(mutex_);
+    if (!IsSessionReady()) {
+      break;
+    }
+    size_t num_bytes_to_read = data_mq_->availableToRead();
+    if (num_bytes_to_read) {
+      if (num_bytes_to_read > (bytes - total_read)) {
+        num_bytes_to_read = bytes - total_read;
+      }
+      if (!data_mq_->read(static_cast<MQDataType*>(buffer) + total_read,
+                          num_bytes_to_read)) {
+        LOG(ERROR) << "FMQ datapath reading " << total_read << "/" << bytes
+                   << " failed";
+        return total_read;
+      }
+      total_read += num_bytes_to_read;
+    } else if (timeout_ms >= kReadPollMs) {
+      lock.unlock();
+      usleep(kReadPollMs * 1000);
+      timeout_ms -= kReadPollMs;
+      continue;
+    } else {
+      LOG(DEBUG) << "Data " << total_read << "/" << bytes << " overflow "
+                 << (kFmqReceiveTimeoutMs - timeout_ms) << " ms";
+      return total_read;
+    }
+  } while (total_read < bytes);
+  return total_read;
+}
+
+/***
+ *
+ * Other methods
+ *
+ ***/
+
+void BluetoothAudioSession::ReportControlStatus(bool start_resp,
+                                                BluetoothAudioStatus status) {
+  std::lock_guard<std::recursive_mutex> guard(mutex_);
+  if (observers_.empty()) {
+    LOG(WARNING) << __func__ << " - SessionType=" << toString(session_type_)
+                 << " has NO port state observer";
+    return;
+  }
+  for (auto& observer : observers_) {
+    uint16_t cookie = observer.first;
+    std::shared_ptr<PortStatusCallbacks> callback = observer.second;
+    LOG(INFO) << __func__ << " - status=" << toString(status)
+              << " for SessionType=" << toString(session_type_)
+              << ", bluetooth_audio=0x"
+              << ::android::base::StringPrintf("%04x", cookie)
+              << (start_resp ? " started" : " suspended");
+    callback->control_result_cb_(cookie, start_resp, status);
+  }
+}
+
+bool BluetoothAudioSession::GetPresentationPosition(
+    PresentationPosition& presentation_position) {
+  std::lock_guard<std::recursive_mutex> guard(mutex_);
+  if (!IsSessionReady()) {
+    LOG(DEBUG) << __func__ << " - SessionType=" << toString(session_type_)
+               << " has NO session";
+    return false;
+  }
+  bool retval = false;
+
+  if (!stack_iface_->getPresentationPosition(&presentation_position).isOk()) {
+    LOG(WARNING) << __func__ << " - IBluetoothAudioPort SessionType="
+                 << toString(session_type_) << " failed";
+    return false;
+  }
+  return retval;
+}
+
+void BluetoothAudioSession::UpdateSourceMetadata(
+    const struct source_metadata& source_metadata) {
+  std::lock_guard<std::recursive_mutex> guard(mutex_);
+  if (!IsSessionReady()) {
+    LOG(DEBUG) << __func__ << " - SessionType=" << toString(session_type_)
+               << " has NO session";
+    return;
+  }
+
+  ssize_t track_count = source_metadata.track_count;
+  LOG(INFO) << __func__ << " - SessionType=" << toString(session_type_) << ","
+            << track_count << " track(s)";
+  if (session_type_ == SessionType::A2DP_SOFTWARE_ENCODING_DATAPATH ||
+      session_type_ == SessionType::A2DP_HARDWARE_OFFLOAD_ENCODING_DATAPATH) {
+    return;
+  }
+
+  SourceMetadata hal_source_metadata;
+  hal_source_metadata.tracks.resize(track_count);
+  for (int i = 0; i < track_count; i++) {
+    hal_source_metadata.tracks[i].usage =
+        static_cast<media::audio::common::AudioUsage>(
+            source_metadata.tracks[i].usage);
+    hal_source_metadata.tracks[i].contentType =
+        static_cast<media::audio::common::AudioContentType>(
+            source_metadata.tracks[i].content_type);
+    hal_source_metadata.tracks[i].gain = source_metadata.tracks[i].gain;
+    LOG(VERBOSE) << __func__ << " - SessionType=" << toString(session_type_)
+                 << ", usage=" << toString(hal_source_metadata.tracks[i].usage)
+                 << ", content="
+                 << toString(hal_source_metadata.tracks[i].contentType)
+                 << ", gain=" << hal_source_metadata.tracks[i].gain;
+  }
+
+  auto hal_retval = stack_iface_->updateSourceMetadata(hal_source_metadata);
+  if (!hal_retval.isOk()) {
+    LOG(WARNING) << __func__ << " - IBluetoothAudioPort SessionType="
+                 << toString(session_type_) << " failed";
+  }
+}
+
+void BluetoothAudioSession::UpdateSinkMetadata(
+    const struct sink_metadata& sink_metadata) {
+  std::lock_guard<std::recursive_mutex> guard(mutex_);
+  if (!IsSessionReady()) {
+    LOG(DEBUG) << __func__ << " - SessionType=" << toString(session_type_)
+               << " has NO session";
+    return;
+  }
+
+  ssize_t track_count = sink_metadata.track_count;
+  LOG(INFO) << __func__ << " - SessionType=" << toString(session_type_) << ","
+            << track_count << " track(s)";
+  if (session_type_ == SessionType::A2DP_SOFTWARE_ENCODING_DATAPATH ||
+      session_type_ == SessionType::A2DP_HARDWARE_OFFLOAD_ENCODING_DATAPATH) {
+    return;
+  }
+
+  SinkMetadata hal_sink_metadata;
+  hal_sink_metadata.tracks.resize(track_count);
+  for (int i = 0; i < track_count; i++) {
+    hal_sink_metadata.tracks[i].source =
+        static_cast<media::audio::common::AudioSource>(
+            sink_metadata.tracks[i].source);
+    hal_sink_metadata.tracks[i].gain = sink_metadata.tracks[i].gain;
+    LOG(INFO) << __func__ << " - SessionType=" << toString(session_type_)
+              << ", source=" << sink_metadata.tracks[i].source
+              << ", dest_device=" << sink_metadata.tracks[i].dest_device
+              << ", gain=" << sink_metadata.tracks[i].gain
+              << ", dest_device_address="
+              << sink_metadata.tracks[i].dest_device_address;
+  }
+
+  auto hal_retval = stack_iface_->updateSinkMetadata(hal_sink_metadata);
+  if (!hal_retval.isOk()) {
+    LOG(WARNING) << __func__ << " - IBluetoothAudioPort SessionType="
+                 << toString(session_type_) << " failed";
+  }
+}
+
+bool BluetoothAudioSession::IsAidlAvailable() {
+  if (is_aidl_checked) return is_aidl_available;
+  is_aidl_available =
+      (AServiceManager_checkService(
+           kDefaultAudioProviderFactoryInterface.c_str()) != nullptr);
+  is_aidl_checked = true;
+  return is_aidl_available;
+}
+
+/***
+ *
+ * BluetoothAudioSessionInstance
+ *
+ ***/
+std::mutex BluetoothAudioSessionInstance::mutex_;
+std::unordered_map<SessionType, std::shared_ptr<BluetoothAudioSession>>
+    BluetoothAudioSessionInstance::sessions_map_;
+
+std::shared_ptr<BluetoothAudioSession>
+BluetoothAudioSessionInstance::GetSessionInstance(
+    const SessionType& session_type) {
+  std::lock_guard<std::mutex> guard(mutex_);
+
+  if (!sessions_map_.empty()) {
+    auto entry = sessions_map_.find(session_type);
+    if (entry != sessions_map_.end()) {
+      return entry->second;
+    }
+  }
+  std::shared_ptr<BluetoothAudioSession> session_ptr =
+      std::make_shared<BluetoothAudioSession>(session_type);
+  sessions_map_[session_type] = session_ptr;
+  return session_ptr;
+}
+
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace hardware
+}  // namespace android
+}  // namespace aidl
\ No newline at end of file
diff --git a/bluetooth/audio/utils/aidl_session/BluetoothAudioSession.h b/bluetooth/audio/utils/aidl_session/BluetoothAudioSession.h
new file mode 100644
index 0000000..85fd571
--- /dev/null
+++ b/bluetooth/audio/utils/aidl_session/BluetoothAudioSession.h
@@ -0,0 +1,227 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <aidl/android/hardware/audio/common/SinkMetadata.h>
+#include <aidl/android/hardware/audio/common/SourceMetadata.h>
+#include <aidl/android/hardware/bluetooth/audio/IBluetoothAudioProvider.h>
+#include <aidl/android/hardware/bluetooth/audio/IBluetoothAudioProviderFactory.h>
+#include <aidl/android/hardware/bluetooth/audio/SessionType.h>
+#include <fmq/AidlMessageQueue.h>
+#include <hardware/audio.h>
+
+#include <mutex>
+#include <unordered_map>
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace bluetooth {
+namespace audio {
+
+using ::aidl::android::hardware::common::fmq::MQDescriptor;
+using ::aidl::android::hardware::common::fmq::SynchronizedReadWrite;
+using ::android::AidlMessageQueue;
+
+using ::aidl::android::hardware::audio::common::SinkMetadata;
+using ::aidl::android::hardware::audio::common::SourceMetadata;
+
+using MQDataType = int8_t;
+using MQDataMode = SynchronizedReadWrite;
+using DataMQ = AidlMessageQueue<MQDataType, MQDataMode>;
+using DataMQDesc =
+    ::aidl::android::hardware::common::fmq::MQDescriptor<MQDataType,
+                                                         MQDataMode>;
+
+static constexpr uint16_t kObserversCookieSize = 0x0010;  // 0x0000 ~ 0x000f
+static constexpr uint16_t kObserversCookieUndefined =
+    (static_cast<uint16_t>(SessionType::UNKNOWN) << 8 & 0xff00);
+inline SessionType ObserversCookieGetSessionType(uint16_t cookie) {
+  return static_cast<SessionType>(cookie >> 8 & 0x00ff);
+}
+inline uint16_t ObserversCookieGetInitValue(SessionType session_type) {
+  return (static_cast<uint16_t>(session_type) << 8 & 0xff00);
+}
+inline uint16_t ObserversCookieGetUpperBound(SessionType session_type) {
+  return (static_cast<uint16_t>(session_type) << 8 & 0xff00) +
+         kObserversCookieSize;
+}
+
+/***
+ * This presents the callbacks of started / suspended and session changed,
+ * and the bluetooth_audio module uses to receive the status notification
+ ***/
+struct PortStatusCallbacks {
+  /***
+   * control_result_cb_ - when the Bluetooth stack reports results of
+   * streamStarted or streamSuspended, the BluetoothAudioProvider will invoke
+   * this callback to report to the bluetooth_audio module.
+   * @param: cookie - indicates which bluetooth_audio output should handle
+   * @param: start_resp - this report is for startStream or not
+   * @param: status - the result of startStream
+   ***/
+  std::function<void(uint16_t cookie, bool start_resp,
+                     BluetoothAudioStatus status)>
+      control_result_cb_;
+  /***
+   * session_changed_cb_ - when the Bluetooth stack start / end session, the
+   * BluetoothAudioProvider will invoke this callback to notify to the
+   * bluetooth_audio module.
+   * @param: cookie - indicates which bluetooth_audio output should handle
+   ***/
+  std::function<void(uint16_t cookie)> session_changed_cb_;
+  /***
+   * audio_configuration_changed_cb_ - when the Bluetooth stack change the audio
+   * configuration, the BluetoothAudioProvider will invoke this callback to
+   * notify to the bluetooth_audio module.
+   * @param: cookie - indicates which bluetooth_audio output should handle
+   ***/
+  std::function<void(uint16_t cookie)> audio_configuration_changed_cb_;
+};
+
+class BluetoothAudioSession {
+ public:
+  BluetoothAudioSession(const SessionType& session_type);
+
+  /***
+   * The function helps to check if this session is ready or not
+   * @return: true if the Bluetooth stack has started the specified session
+   ***/
+  bool IsSessionReady();
+
+  /***
+   * The report function is used to report that the Bluetooth stack has started
+   * this session without any failure, and will invoke session_changed_cb_ to
+   * notify those registered bluetooth_audio outputs
+   ***/
+  void OnSessionStarted(const std::shared_ptr<IBluetoothAudioPort> stack_iface,
+                        const DataMQDesc* mq_desc,
+                        const AudioConfiguration& audio_config);
+
+  /***
+   * The report function is used to report that the Bluetooth stack has ended
+   * the session, and will invoke session_changed_cb_ to notify registered
+   * bluetooth_audio outputs
+   ***/
+  void OnSessionEnded();
+
+  /***
+   * The report function is used to report that the Bluetooth stack has notified
+   * the result of startStream or suspendStream, and will invoke
+   * control_result_cb_ to notify registered bluetooth_audio outputs
+   ***/
+  void ReportControlStatus(bool start_resp, BluetoothAudioStatus status);
+
+  /***
+   * The control function helps the bluetooth_audio module to register
+   * PortStatusCallbacks
+   * @return: cookie - the assigned number to this bluetooth_audio output
+   ***/
+  uint16_t RegisterStatusCback(const PortStatusCallbacks& cbacks);
+
+  /***
+   * The control function helps the bluetooth_audio module to unregister
+   * PortStatusCallbacks
+   * @param: cookie - indicates which bluetooth_audio output is
+   ***/
+  void UnregisterStatusCback(uint16_t cookie);
+
+  /***
+   * The control function is for the bluetooth_audio module to get the current
+   * AudioConfiguration
+   ***/
+  const AudioConfiguration& GetAudioConfig();
+
+  /***
+   * The report function is used to report that the Bluetooth stack has notified
+   * the audio configuration changed, and will invoke
+   * audio_configuration_changed_cb_ to notify registered bluetooth_audio
+   * outputs
+   ***/
+  void ReportAudioConfigChanged(const AudioConfiguration& audio_config);
+
+  /***
+   * Those control functions are for the bluetooth_audio module to start,
+   * suspend, stop stream, to check position, and to update metadata.
+   ***/
+  bool StartStream();
+  bool SuspendStream();
+  void StopStream();
+  bool GetPresentationPosition(PresentationPosition& presentation_position);
+  void UpdateSourceMetadata(const struct source_metadata& source_metadata);
+  void UpdateSinkMetadata(const struct sink_metadata& sink_metadata);
+
+  // The control function writes stream to FMQ
+  size_t OutWritePcmData(const void* buffer, size_t bytes);
+  // The control function read stream from FMQ
+  size_t InReadPcmData(void* buffer, size_t bytes);
+
+  // Return if IBluetoothAudioProviderFactory implementation existed
+  static bool IsAidlAvailable();
+
+  static constexpr PcmConfiguration kInvalidPcmConfiguration = {};
+  // can't be constexpr because of non-literal type
+  static const CodecConfiguration kInvalidCodecConfiguration;
+
+  static AudioConfiguration invalidSoftwareAudioConfiguration;
+  static AudioConfiguration invalidOffloadAudioConfiguration;
+  static AudioConfiguration invalidLeOffloadAudioConfig;
+
+ private:
+  // using recursive_mutex to allow hwbinder to re-enter again.
+  std::recursive_mutex mutex_;
+  SessionType session_type_;
+
+  // audio control path to use for both software and offloading
+  std::shared_ptr<IBluetoothAudioPort> stack_iface_;
+  // audio data path (FMQ) for software encoding
+  std::unique_ptr<DataMQ> data_mq_;
+  // audio data configuration for both software and offloading
+  std::unique_ptr<AudioConfiguration> audio_config_;
+
+  // saving those registered bluetooth_audio's callbacks
+  std::unordered_map<uint16_t, std::shared_ptr<struct PortStatusCallbacks>>
+      observers_;
+
+  bool UpdateDataPath(const DataMQDesc* mq_desc);
+  bool UpdateAudioConfig(const AudioConfiguration& audio_config);
+  // invoking the registered session_changed_cb_
+  void ReportSessionStatus();
+
+  static inline std::atomic<bool> is_aidl_checked = false;
+  static inline std::atomic<bool> is_aidl_available = false;
+  static inline const std::string kDefaultAudioProviderFactoryInterface =
+      std::string() + IBluetoothAudioProviderFactory::descriptor + "/default";
+};
+
+class BluetoothAudioSessionInstance {
+ public:
+  // The API is to fetch the specified session of A2DP / Hearing Aid
+  static std::shared_ptr<BluetoothAudioSession> GetSessionInstance(
+      const SessionType& session_type);
+
+ private:
+  static std::mutex mutex_;
+  static std::unordered_map<SessionType, std::shared_ptr<BluetoothAudioSession>>
+      sessions_map_;
+};
+
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace hardware
+}  // namespace android
+}  // namespace aidl
\ No newline at end of file
diff --git a/bluetooth/audio/utils/aidl_session/BluetoothAudioSessionControl.h b/bluetooth/audio/utils/aidl_session/BluetoothAudioSessionControl.h
new file mode 100644
index 0000000..a3ed428
--- /dev/null
+++ b/bluetooth/audio/utils/aidl_session/BluetoothAudioSessionControl.h
@@ -0,0 +1,182 @@
+/*
+ * Copyright 2018 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 "BluetoothAudioSession.h"
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace bluetooth {
+namespace audio {
+
+class BluetoothAudioSessionControl {
+ public:
+  /***
+   * The control API helps to check if session is ready or not
+   * @return: true if the Bluetooth stack has started th specified session
+   ***/
+  static bool IsSessionReady(const SessionType& session_type) {
+    std::shared_ptr<BluetoothAudioSession> session_ptr =
+        BluetoothAudioSessionInstance::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      return session_ptr->IsSessionReady();
+    }
+
+    return false;
+  }
+
+  /***
+   * The control API helps the bluetooth_audio module to register
+   * PortStatusCallbacks
+   * @return: cookie - the assigned number to this bluetooth_audio output
+   ***/
+  static uint16_t RegisterControlResultCback(
+      const SessionType& session_type, const PortStatusCallbacks& cbacks) {
+    std::shared_ptr<BluetoothAudioSession> session_ptr =
+        BluetoothAudioSessionInstance::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      return session_ptr->RegisterStatusCback(cbacks);
+    }
+    return kObserversCookieUndefined;
+  }
+
+  /***
+   * The control API helps the bluetooth_audio module to unregister
+   * PortStatusCallbacks
+   * @param: cookie - indicates which bluetooth_audio output is
+   ***/
+  static void UnregisterControlResultCback(const SessionType& session_type,
+                                           uint16_t cookie) {
+    std::shared_ptr<BluetoothAudioSession> session_ptr =
+        BluetoothAudioSessionInstance::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      session_ptr->UnregisterStatusCback(cookie);
+    }
+  }
+
+  /***
+   * The control API for the bluetooth_audio module to get current
+   * AudioConfiguration
+   ***/
+  static const AudioConfiguration GetAudioConfig(
+      const SessionType& session_type) {
+    std::shared_ptr<BluetoothAudioSession> session_ptr =
+        BluetoothAudioSessionInstance::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      return session_ptr->GetAudioConfig();
+    } else if (session_type ==
+               SessionType::A2DP_HARDWARE_OFFLOAD_ENCODING_DATAPATH) {
+      return BluetoothAudioSession::invalidOffloadAudioConfiguration;
+    } else {
+      return BluetoothAudioSession::invalidSoftwareAudioConfiguration;
+    }
+  }
+
+  /***
+   * Those control APIs for the bluetooth_audio module to start / suspend /
+  stop
+   * stream, to check position, and to update metadata.
+  ***/
+  static bool StartStream(const SessionType& session_type) {
+    std::shared_ptr<BluetoothAudioSession> session_ptr =
+        BluetoothAudioSessionInstance::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      return session_ptr->StartStream();
+    }
+    return false;
+  }
+
+  static bool SuspendStream(const SessionType& session_type) {
+    std::shared_ptr<BluetoothAudioSession> session_ptr =
+        BluetoothAudioSessionInstance::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      return session_ptr->SuspendStream();
+    }
+    return false;
+  }
+
+  static void StopStream(const SessionType& session_type) {
+    std::shared_ptr<BluetoothAudioSession> session_ptr =
+        BluetoothAudioSessionInstance::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      session_ptr->StopStream();
+    }
+  }
+
+  static bool GetPresentationPosition(
+      const SessionType& session_type,
+      PresentationPosition& presentation_position) {
+    std::shared_ptr<BluetoothAudioSession> session_ptr =
+        BluetoothAudioSessionInstance::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      return session_ptr->GetPresentationPosition(presentation_position);
+    }
+    return false;
+  }
+
+  static void UpdateSourceMetadata(
+      const SessionType& session_type,
+      const struct source_metadata& source_metadata) {
+    std::shared_ptr<BluetoothAudioSession> session_ptr =
+        BluetoothAudioSessionInstance::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      session_ptr->UpdateSourceMetadata(source_metadata);
+    }
+  }
+
+  static void UpdateSinkMetadata(const SessionType& session_type,
+                                 const struct sink_metadata& sink_metadata) {
+    std::shared_ptr<BluetoothAudioSession> session_ptr =
+        BluetoothAudioSessionInstance::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      session_ptr->UpdateSinkMetadata(sink_metadata);
+    }
+  }
+
+  /***
+   * The control API writes stream to FMQ
+   ***/
+  static size_t OutWritePcmData(const SessionType& session_type,
+                                const void* buffer, size_t bytes) {
+    std::shared_ptr<BluetoothAudioSession> session_ptr =
+        BluetoothAudioSessionInstance::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      return session_ptr->OutWritePcmData(buffer, bytes);
+    }
+    return 0;
+  }
+
+  /***
+   * The control API reads stream from FMQ
+   ***/
+  static size_t InReadPcmData(const SessionType& session_type, void* buffer,
+                              size_t bytes) {
+    std::shared_ptr<BluetoothAudioSession> session_ptr =
+        BluetoothAudioSessionInstance::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      return session_ptr->InReadPcmData(buffer, bytes);
+    }
+    return 0;
+  }
+};
+
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace hardware
+}  // namespace android
+}  // namespace aidl
\ No newline at end of file
diff --git a/bluetooth/audio/utils/aidl_session/BluetoothAudioSessionReport.h b/bluetooth/audio/utils/aidl_session/BluetoothAudioSessionReport.h
new file mode 100644
index 0000000..18569c3
--- /dev/null
+++ b/bluetooth/audio/utils/aidl_session/BluetoothAudioSessionReport.h
@@ -0,0 +1,87 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include "BluetoothAudioSession.h"
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace bluetooth {
+namespace audio {
+
+class BluetoothAudioSessionReport {
+ public:
+  /***
+   * The API reports the Bluetooth stack has started the session, and will
+   * inform registered bluetooth_audio outputs
+   ***/
+  static void OnSessionStarted(
+      const SessionType& session_type,
+      const std::shared_ptr<IBluetoothAudioPort> host_iface,
+      const DataMQDesc* data_mq, const AudioConfiguration& audio_config) {
+    std::shared_ptr<BluetoothAudioSession> session_ptr =
+        BluetoothAudioSessionInstance::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      session_ptr->OnSessionStarted(host_iface, data_mq, audio_config);
+    }
+  }
+
+  /***
+   * The API reports the Bluetooth stack has ended the session, and will
+   * inform registered bluetooth_audio outputs
+   ***/
+  static void OnSessionEnded(const SessionType& session_type) {
+    std::shared_ptr<BluetoothAudioSession> session_ptr =
+        BluetoothAudioSessionInstance::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      session_ptr->OnSessionEnded();
+    }
+  }
+
+  /***
+   * The API reports the Bluetooth stack has replied the result of startStream
+   * or suspendStream, and will inform registered bluetooth_audio outputs
+   ***/
+  static void ReportControlStatus(const SessionType& session_type,
+                                  const bool& start_resp,
+                                  BluetoothAudioStatus status) {
+    std::shared_ptr<BluetoothAudioSession> session_ptr =
+        BluetoothAudioSessionInstance::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      session_ptr->ReportControlStatus(start_resp, status);
+    }
+  }
+  /***
+   * The API reports the Bluetooth stack has replied the changed of the audio
+   * configuration, and will inform registered bluetooth_audio outputs
+   ***/
+  static void ReportAudioConfigChanged(const SessionType& session_type,
+                                       const AudioConfiguration& audio_config) {
+    std::shared_ptr<BluetoothAudioSession> session_ptr =
+        BluetoothAudioSessionInstance::GetSessionInstance(session_type);
+    if (session_ptr != nullptr) {
+      session_ptr->ReportAudioConfigChanged(audio_config);
+    }
+  }
+};
+
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace hardware
+}  // namespace android
+}  // namespace aidl
\ No newline at end of file
diff --git a/bluetooth/audio/utils/aidl_session/HidlToAidlMiddleware.cpp b/bluetooth/audio/utils/aidl_session/HidlToAidlMiddleware.cpp
new file mode 100644
index 0000000..91e0238
--- /dev/null
+++ b/bluetooth/audio/utils/aidl_session/HidlToAidlMiddleware.cpp
@@ -0,0 +1,775 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "BtAudioNakahara"
+
+#include <aidl/android/hardware/bluetooth/audio/AudioConfiguration.h>
+#include <aidl/android/hardware/bluetooth/audio/BluetoothAudioStatus.h>
+#include <aidl/android/hardware/bluetooth/audio/SessionType.h>
+#include <android-base/logging.h>
+
+#include <functional>
+#include <unordered_map>
+
+#include "../aidl_session/BluetoothAudioSession.h"
+#include "../aidl_session/BluetoothAudioSessionControl.h"
+#include "HidlToAidlMiddleware_2_0.h"
+#include "HidlToAidlMiddleware_2_1.h"
+#include "HidlToAidlMiddleware_2_2.h"
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace bluetooth {
+namespace audio {
+
+using HidlStatus = ::android::hardware::bluetooth::audio::V2_0::Status;
+using PcmConfig_2_0 =
+    ::android::hardware::bluetooth::audio::V2_0::PcmParameters;
+using SampleRate_2_0 = ::android::hardware::bluetooth::audio::V2_0::SampleRate;
+using ChannelMode_2_0 =
+    ::android::hardware::bluetooth::audio::V2_0::ChannelMode;
+using BitsPerSample_2_0 =
+    ::android::hardware::bluetooth::audio::V2_0::BitsPerSample;
+using CodecConfig_2_0 =
+    ::android::hardware::bluetooth::audio::V2_0::CodecConfiguration;
+using CodecType_2_0 = ::android::hardware::bluetooth::audio::V2_0::CodecType;
+using SbcConfig_2_0 =
+    ::android::hardware::bluetooth::audio::V2_0::SbcParameters;
+using AacConfig_2_0 =
+    ::android::hardware::bluetooth::audio::V2_0::AacParameters;
+using LdacConfig_2_0 =
+    ::android::hardware::bluetooth::audio::V2_0::LdacParameters;
+using AptxConfig_2_0 =
+    ::android::hardware::bluetooth::audio::V2_0::AptxParameters;
+using SbcAllocMethod_2_0 =
+    ::android::hardware::bluetooth::audio::V2_0::SbcAllocMethod;
+using SbcBlockLength_2_0 =
+    ::android::hardware::bluetooth::audio::V2_0::SbcBlockLength;
+using SbcChannelMode_2_0 =
+    ::android::hardware::bluetooth::audio::V2_0::SbcChannelMode;
+using SbcNumSubbands_2_0 =
+    ::android::hardware::bluetooth::audio::V2_0::SbcNumSubbands;
+using AacObjectType_2_0 =
+    ::android::hardware::bluetooth::audio::V2_0::AacObjectType;
+using AacVarBitRate_2_0 =
+    ::android::hardware::bluetooth::audio::V2_0::AacVariableBitRate;
+using LdacChannelMode_2_0 =
+    ::android::hardware::bluetooth::audio::V2_0::LdacChannelMode;
+using LdacQualityIndex_2_0 =
+    ::android::hardware::bluetooth::audio::V2_0::LdacQualityIndex;
+
+using PcmConfig_2_1 =
+    ::android::hardware::bluetooth::audio::V2_1::PcmParameters;
+using SampleRate_2_1 = ::android::hardware::bluetooth::audio::V2_1::SampleRate;
+using Lc3CodecConfig_2_1 =
+    ::android::hardware::bluetooth::audio::V2_1::Lc3CodecConfiguration;
+using Lc3Config_2_1 =
+    ::android::hardware::bluetooth::audio::V2_1::Lc3Parameters;
+using Lc3FrameDuration_2_1 =
+    ::android::hardware::bluetooth::audio::V2_1::Lc3FrameDuration;
+
+using LeAudioConfig_2_2 =
+    ::android::hardware::bluetooth::audio::V2_2::LeAudioConfiguration;
+using LeAudioMode_2_2 =
+    ::android::hardware::bluetooth::audio::V2_2::LeAudioMode;
+
+std::mutex legacy_callback_lock;
+std::unordered_map<
+    SessionType,
+    std::unordered_map<uint16_t, std::shared_ptr<PortStatusCallbacks_2_2>>>
+    legacy_callback_table;
+
+const static std::unordered_map<SessionType_2_0, SessionType>
+    session_type_2_0_to_aidl_map{
+        {SessionType_2_0::A2DP_SOFTWARE_ENCODING_DATAPATH,
+         SessionType::A2DP_SOFTWARE_ENCODING_DATAPATH},
+        {SessionType_2_0::A2DP_HARDWARE_OFFLOAD_DATAPATH,
+         SessionType::A2DP_HARDWARE_OFFLOAD_ENCODING_DATAPATH},
+        {SessionType_2_0::HEARING_AID_SOFTWARE_ENCODING_DATAPATH,
+         SessionType::HEARING_AID_SOFTWARE_ENCODING_DATAPATH},
+    };
+
+const static std::unordered_map<SessionType_2_1, SessionType>
+    session_type_2_1_to_aidl_map{
+        {SessionType_2_1::A2DP_SOFTWARE_ENCODING_DATAPATH,
+         SessionType::A2DP_SOFTWARE_ENCODING_DATAPATH},
+        {SessionType_2_1::A2DP_HARDWARE_OFFLOAD_DATAPATH,
+         SessionType::A2DP_HARDWARE_OFFLOAD_ENCODING_DATAPATH},
+        {SessionType_2_1::HEARING_AID_SOFTWARE_ENCODING_DATAPATH,
+         SessionType::HEARING_AID_SOFTWARE_ENCODING_DATAPATH},
+        {SessionType_2_1::LE_AUDIO_SOFTWARE_ENCODING_DATAPATH,
+         SessionType::LE_AUDIO_SOFTWARE_ENCODING_DATAPATH},
+        {SessionType_2_1::LE_AUDIO_SOFTWARE_DECODED_DATAPATH,
+         SessionType::LE_AUDIO_SOFTWARE_DECODING_DATAPATH},
+        {SessionType_2_1::LE_AUDIO_HARDWARE_OFFLOAD_ENCODING_DATAPATH,
+         SessionType::LE_AUDIO_HARDWARE_OFFLOAD_ENCODING_DATAPATH},
+        {SessionType_2_1::LE_AUDIO_HARDWARE_OFFLOAD_DECODING_DATAPATH,
+         SessionType::LE_AUDIO_HARDWARE_OFFLOAD_DECODING_DATAPATH},
+    };
+
+const static std::unordered_map<int32_t, SampleRate_2_0>
+    sample_rate_to_hidl_2_0_map{
+        {44100, SampleRate_2_0::RATE_44100},
+        {48000, SampleRate_2_0::RATE_48000},
+        {88200, SampleRate_2_0::RATE_88200},
+        {96000, SampleRate_2_0::RATE_96000},
+        {176400, SampleRate_2_0::RATE_176400},
+        {192000, SampleRate_2_0::RATE_192000},
+        {16000, SampleRate_2_0::RATE_16000},
+        {24000, SampleRate_2_0::RATE_24000},
+    };
+
+const static std::unordered_map<int32_t, SampleRate_2_1>
+    sample_rate_to_hidl_2_1_map{
+        {44100, SampleRate_2_1::RATE_44100},
+        {48000, SampleRate_2_1::RATE_48000},
+        {88200, SampleRate_2_1::RATE_88200},
+        {96000, SampleRate_2_1::RATE_96000},
+        {176400, SampleRate_2_1::RATE_176400},
+        {192000, SampleRate_2_1::RATE_192000},
+        {16000, SampleRate_2_1::RATE_16000},
+        {24000, SampleRate_2_1::RATE_24000},
+        {8000, SampleRate_2_1::RATE_8000},
+        {32000, SampleRate_2_1::RATE_32000},
+    };
+
+const static std::unordered_map<CodecType, CodecType_2_0>
+    codec_type_to_hidl_2_0_map{
+        {CodecType::UNKNOWN, CodecType_2_0::UNKNOWN},
+        {CodecType::SBC, CodecType_2_0::SBC},
+        {CodecType::AAC, CodecType_2_0::AAC},
+        {CodecType::APTX, CodecType_2_0::APTX},
+        {CodecType::APTX_HD, CodecType_2_0::APTX_HD},
+        {CodecType::LDAC, CodecType_2_0::LDAC},
+        {CodecType::LC3, CodecType_2_0::UNKNOWN},
+    };
+
+const static std::unordered_map<SbcChannelMode, SbcChannelMode_2_0>
+    sbc_channel_mode_to_hidl_2_0_map{
+        {SbcChannelMode::UNKNOWN, SbcChannelMode_2_0::UNKNOWN},
+        {SbcChannelMode::JOINT_STEREO, SbcChannelMode_2_0::JOINT_STEREO},
+        {SbcChannelMode::STEREO, SbcChannelMode_2_0::STEREO},
+        {SbcChannelMode::DUAL, SbcChannelMode_2_0::DUAL},
+        {SbcChannelMode::MONO, SbcChannelMode_2_0::MONO},
+    };
+
+const static std::unordered_map<int8_t, SbcBlockLength_2_0>
+    sbc_block_length_to_hidl_map{
+        {4, SbcBlockLength_2_0::BLOCKS_4},
+        {8, SbcBlockLength_2_0::BLOCKS_8},
+        {12, SbcBlockLength_2_0::BLOCKS_12},
+        {16, SbcBlockLength_2_0::BLOCKS_16},
+    };
+
+const static std::unordered_map<int8_t, SbcNumSubbands_2_0>
+    sbc_subbands_to_hidl_map{
+        {4, SbcNumSubbands_2_0::SUBBAND_4},
+        {8, SbcNumSubbands_2_0::SUBBAND_8},
+    };
+
+const static std::unordered_map<SbcAllocMethod, SbcAllocMethod_2_0>
+    sbc_alloc_method_to_hidl_map{
+        {SbcAllocMethod::ALLOC_MD_S, SbcAllocMethod_2_0::ALLOC_MD_S},
+        {SbcAllocMethod::ALLOC_MD_L, SbcAllocMethod_2_0::ALLOC_MD_L},
+    };
+
+const static std::unordered_map<AacObjectType, AacObjectType_2_0>
+    aac_object_type_to_hidl_map{
+        {AacObjectType::MPEG2_LC, AacObjectType_2_0::MPEG2_LC},
+        {AacObjectType::MPEG4_LC, AacObjectType_2_0::MPEG4_LC},
+        {AacObjectType::MPEG4_LTP, AacObjectType_2_0::MPEG4_LTP},
+        {AacObjectType::MPEG4_SCALABLE, AacObjectType_2_0::MPEG4_SCALABLE},
+    };
+
+const static std::unordered_map<LdacChannelMode, LdacChannelMode_2_0>
+    ldac_channel_mode_to_hidl_map{
+        {LdacChannelMode::UNKNOWN, LdacChannelMode_2_0::UNKNOWN},
+        {LdacChannelMode::STEREO, LdacChannelMode_2_0::STEREO},
+        {LdacChannelMode::DUAL, LdacChannelMode_2_0::DUAL},
+        {LdacChannelMode::MONO, LdacChannelMode_2_0::MONO},
+    };
+
+const static std::unordered_map<LdacQualityIndex, LdacQualityIndex_2_0>
+    ldac_qindex_to_hidl_map{
+        {LdacQualityIndex::HIGH, LdacQualityIndex_2_0::QUALITY_HIGH},
+        {LdacQualityIndex::MID, LdacQualityIndex_2_0::QUALITY_MID},
+        {LdacQualityIndex::LOW, LdacQualityIndex_2_0::QUALITY_LOW},
+        {LdacQualityIndex::ABR, LdacQualityIndex_2_0::QUALITY_ABR},
+    };
+
+const static std::unordered_map<LeAudioMode, LeAudioMode_2_2>
+    leaudio_mode_to_hidl_map{
+        {LeAudioMode::UNKNOWN, LeAudioMode_2_2::UNKNOWN},
+        {LeAudioMode::UNICAST, LeAudioMode_2_2::UNICAST},
+        {LeAudioMode::BROADCAST, LeAudioMode_2_2::BROADCAST},
+    };
+
+inline SessionType from_session_type_2_0(
+    const SessionType_2_0& session_type_hidl) {
+  auto it = session_type_2_0_to_aidl_map.find(session_type_hidl);
+  if (it != session_type_2_0_to_aidl_map.end()) return it->second;
+  return SessionType::UNKNOWN;
+}
+
+inline SessionType from_session_type_2_1(
+    const SessionType_2_1& session_type_hidl) {
+  auto it = session_type_2_1_to_aidl_map.find(session_type_hidl);
+  if (it != session_type_2_1_to_aidl_map.end()) return it->second;
+  return SessionType::UNKNOWN;
+}
+
+inline HidlStatus to_hidl_status(const BluetoothAudioStatus& status) {
+  switch (status) {
+    case BluetoothAudioStatus::SUCCESS:
+      return HidlStatus::SUCCESS;
+    case BluetoothAudioStatus::UNSUPPORTED_CODEC_CONFIGURATION:
+      return HidlStatus::UNSUPPORTED_CODEC_CONFIGURATION;
+    default:
+      return HidlStatus::FAILURE;
+  }
+}
+
+inline SampleRate_2_0 to_hidl_sample_rate_2_0(const int32_t sample_rate_hz) {
+  auto it = sample_rate_to_hidl_2_0_map.find(sample_rate_hz);
+  if (it != sample_rate_to_hidl_2_0_map.end()) return it->second;
+  return SampleRate_2_0::RATE_UNKNOWN;
+}
+
+inline SampleRate_2_1 to_hidl_sample_rate_2_1(const int32_t sample_rate_hz) {
+  auto it = sample_rate_to_hidl_2_1_map.find(sample_rate_hz);
+  if (it != sample_rate_to_hidl_2_1_map.end()) return it->second;
+  return SampleRate_2_1::RATE_UNKNOWN;
+}
+
+inline BitsPerSample_2_0 to_hidl_bits_per_sample(const int8_t bit_per_sample) {
+  switch (bit_per_sample) {
+    case 16:
+      return BitsPerSample_2_0::BITS_16;
+    case 24:
+      return BitsPerSample_2_0::BITS_24;
+    case 32:
+      return BitsPerSample_2_0::BITS_32;
+    default:
+      return BitsPerSample_2_0::BITS_UNKNOWN;
+  }
+}
+
+inline ChannelMode_2_0 to_hidl_channel_mode(const ChannelMode channel_mode) {
+  switch (channel_mode) {
+    case ChannelMode::MONO:
+      return ChannelMode_2_0::MONO;
+    case ChannelMode::STEREO:
+      return ChannelMode_2_0::STEREO;
+    default:
+      return ChannelMode_2_0::UNKNOWN;
+  }
+}
+
+inline PcmConfig_2_0 to_hidl_pcm_config_2_0(
+    const PcmConfiguration& pcm_config) {
+  PcmConfig_2_0 hidl_pcm_config;
+  hidl_pcm_config.sampleRate = to_hidl_sample_rate_2_0(pcm_config.sampleRateHz);
+  hidl_pcm_config.channelMode = to_hidl_channel_mode(pcm_config.channelMode);
+  hidl_pcm_config.bitsPerSample =
+      to_hidl_bits_per_sample(pcm_config.bitsPerSample);
+  return hidl_pcm_config;
+}
+
+inline CodecType_2_0 to_hidl_codec_type_2_0(const CodecType codec_type) {
+  auto it = codec_type_to_hidl_2_0_map.find(codec_type);
+  if (it != codec_type_to_hidl_2_0_map.end()) return it->second;
+  return CodecType_2_0::UNKNOWN;
+}
+
+inline SbcConfig_2_0 to_hidl_sbc_config(const SbcConfiguration sbc_config) {
+  SbcConfig_2_0 hidl_sbc_config;
+  hidl_sbc_config.minBitpool = sbc_config.minBitpool;
+  hidl_sbc_config.maxBitpool = sbc_config.maxBitpool;
+  hidl_sbc_config.sampleRate = to_hidl_sample_rate_2_0(sbc_config.sampleRateHz);
+  hidl_sbc_config.bitsPerSample =
+      to_hidl_bits_per_sample(sbc_config.bitsPerSample);
+  if (sbc_channel_mode_to_hidl_2_0_map.find(sbc_config.channelMode) !=
+      sbc_channel_mode_to_hidl_2_0_map.end()) {
+    hidl_sbc_config.channelMode =
+        sbc_channel_mode_to_hidl_2_0_map.at(sbc_config.channelMode);
+  }
+  if (sbc_block_length_to_hidl_map.find(sbc_config.blockLength) !=
+      sbc_block_length_to_hidl_map.end()) {
+    hidl_sbc_config.blockLength =
+        sbc_block_length_to_hidl_map.at(sbc_config.blockLength);
+  }
+  if (sbc_subbands_to_hidl_map.find(sbc_config.numSubbands) !=
+      sbc_subbands_to_hidl_map.end()) {
+    hidl_sbc_config.numSubbands =
+        sbc_subbands_to_hidl_map.at(sbc_config.numSubbands);
+  }
+  if (sbc_alloc_method_to_hidl_map.find(sbc_config.allocMethod) !=
+      sbc_alloc_method_to_hidl_map.end()) {
+    hidl_sbc_config.allocMethod =
+        sbc_alloc_method_to_hidl_map.at(sbc_config.allocMethod);
+  }
+  return hidl_sbc_config;
+}
+
+inline AacConfig_2_0 to_hidl_aac_config(const AacConfiguration aac_config) {
+  AacConfig_2_0 hidl_aac_config;
+  hidl_aac_config.sampleRate = to_hidl_sample_rate_2_0(aac_config.sampleRateHz);
+  hidl_aac_config.bitsPerSample =
+      to_hidl_bits_per_sample(aac_config.bitsPerSample);
+  hidl_aac_config.channelMode = to_hidl_channel_mode(aac_config.channelMode);
+  if (aac_object_type_to_hidl_map.find(aac_config.objectType) !=
+      aac_object_type_to_hidl_map.end()) {
+    hidl_aac_config.objectType =
+        aac_object_type_to_hidl_map.at(aac_config.objectType);
+  }
+  hidl_aac_config.variableBitRateEnabled = aac_config.variableBitRateEnabled
+                                               ? AacVarBitRate_2_0::ENABLED
+                                               : AacVarBitRate_2_0::DISABLED;
+  return hidl_aac_config;
+}
+
+inline LdacConfig_2_0 to_hidl_ldac_config(const LdacConfiguration ldac_config) {
+  LdacConfig_2_0 hidl_ldac_config;
+  hidl_ldac_config.sampleRate =
+      to_hidl_sample_rate_2_0(ldac_config.sampleRateHz);
+  hidl_ldac_config.bitsPerSample =
+      to_hidl_bits_per_sample(ldac_config.bitsPerSample);
+  if (ldac_channel_mode_to_hidl_map.find(ldac_config.channelMode) !=
+      ldac_channel_mode_to_hidl_map.end()) {
+    hidl_ldac_config.channelMode =
+        ldac_channel_mode_to_hidl_map.at(ldac_config.channelMode);
+  }
+  if (ldac_qindex_to_hidl_map.find(ldac_config.qualityIndex) !=
+      ldac_qindex_to_hidl_map.end()) {
+    hidl_ldac_config.qualityIndex =
+        ldac_qindex_to_hidl_map.at(ldac_config.qualityIndex);
+  }
+  return hidl_ldac_config;
+}
+
+inline AptxConfig_2_0 to_hidl_aptx_config(const AptxConfiguration aptx_config) {
+  AptxConfig_2_0 hidl_aptx_config;
+  hidl_aptx_config.sampleRate =
+      to_hidl_sample_rate_2_0(aptx_config.sampleRateHz);
+  hidl_aptx_config.bitsPerSample =
+      to_hidl_bits_per_sample(aptx_config.bitsPerSample);
+  hidl_aptx_config.channelMode = to_hidl_channel_mode(aptx_config.channelMode);
+  return hidl_aptx_config;
+}
+
+inline CodecConfig_2_0 to_hidl_codec_config_2_0(
+    const CodecConfiguration& codec_config) {
+  CodecConfig_2_0 hidl_codec_config;
+  hidl_codec_config.codecType = to_hidl_codec_type_2_0(codec_config.codecType);
+  hidl_codec_config.encodedAudioBitrate =
+      static_cast<uint32_t>(codec_config.encodedAudioBitrate);
+  hidl_codec_config.peerMtu = static_cast<uint32_t>(codec_config.peerMtu);
+  hidl_codec_config.isScmstEnabled = codec_config.isScmstEnabled;
+  switch (codec_config.config.getTag()) {
+    case CodecConfiguration::CodecSpecific::sbcConfig:
+      hidl_codec_config.config.sbcConfig(to_hidl_sbc_config(
+          codec_config.config
+              .get<CodecConfiguration::CodecSpecific::sbcConfig>()));
+      break;
+    case CodecConfiguration::CodecSpecific::aacConfig:
+      hidl_codec_config.config.aacConfig(to_hidl_aac_config(
+          codec_config.config
+              .get<CodecConfiguration::CodecSpecific::aacConfig>()));
+      break;
+    case CodecConfiguration::CodecSpecific::ldacConfig:
+      hidl_codec_config.config.ldacConfig(to_hidl_ldac_config(
+          codec_config.config
+              .get<CodecConfiguration::CodecSpecific::ldacConfig>()));
+      break;
+    case CodecConfiguration::CodecSpecific::aptxConfig:
+      hidl_codec_config.config.aptxConfig(to_hidl_aptx_config(
+          codec_config.config
+              .get<CodecConfiguration::CodecSpecific::aptxConfig>()));
+      break;
+    default:
+      break;
+  }
+  return hidl_codec_config;
+}
+
+inline AudioConfig_2_0 to_hidl_audio_config_2_0(
+    const AudioConfiguration& audio_config) {
+  AudioConfig_2_0 hidl_audio_config;
+  if (audio_config.getTag() == AudioConfiguration::pcmConfig) {
+    hidl_audio_config.pcmConfig(to_hidl_pcm_config_2_0(
+        audio_config.get<AudioConfiguration::pcmConfig>()));
+  } else if (audio_config.getTag() == AudioConfiguration::a2dpConfig) {
+    hidl_audio_config.codecConfig(to_hidl_codec_config_2_0(
+        audio_config.get<AudioConfiguration::a2dpConfig>()));
+  }
+  return hidl_audio_config;
+}
+
+inline PcmConfig_2_1 to_hidl_pcm_config_2_1(
+    const PcmConfiguration& pcm_config) {
+  PcmConfig_2_1 hidl_pcm_config;
+  hidl_pcm_config.sampleRate = to_hidl_sample_rate_2_1(pcm_config.sampleRateHz);
+  hidl_pcm_config.channelMode = to_hidl_channel_mode(pcm_config.channelMode);
+  hidl_pcm_config.bitsPerSample =
+      to_hidl_bits_per_sample(pcm_config.bitsPerSample);
+  hidl_pcm_config.dataIntervalUs =
+      static_cast<uint32_t>(pcm_config.dataIntervalUs);
+  return hidl_pcm_config;
+}
+
+inline Lc3Config_2_1 to_hidl_lc3_config_2_1(
+    const Lc3Configuration& lc3_config) {
+  Lc3Config_2_1 hidl_lc3_config;
+  hidl_lc3_config.pcmBitDepth = to_hidl_bits_per_sample(lc3_config.pcmBitDepth);
+  hidl_lc3_config.samplingFrequency =
+      to_hidl_sample_rate_2_1(lc3_config.samplingFrequencyHz);
+  if (lc3_config.samplingFrequencyHz == 10000)
+    hidl_lc3_config.frameDuration = Lc3FrameDuration_2_1::DURATION_10000US;
+  else if (lc3_config.samplingFrequencyHz == 7500)
+    hidl_lc3_config.frameDuration = Lc3FrameDuration_2_1::DURATION_7500US;
+  hidl_lc3_config.octetsPerFrame =
+      static_cast<uint32_t>(lc3_config.octetsPerFrame);
+  hidl_lc3_config.blocksPerSdu = static_cast<uint32_t>(lc3_config.blocksPerSdu);
+  return hidl_lc3_config;
+}
+
+inline Lc3CodecConfig_2_1 to_hidl_leaudio_config_2_1(
+    const LeAudioConfiguration& leaudio_config) {
+  auto& unicast_config =
+      leaudio_config.modeConfig
+          .get<LeAudioConfiguration::LeAudioModeConfig::unicastConfig>();
+
+  auto& le_codec_config = unicast_config.leAudioCodecConfig
+                              .get<LeAudioCodecConfiguration::lc3Config>();
+
+  Lc3CodecConfig_2_1 hidl_lc3_codec_config;
+  hidl_lc3_codec_config.lc3Config = to_hidl_lc3_config_2_1(le_codec_config);
+
+  hidl_lc3_codec_config.audioChannelAllocation =
+      unicast_config.streamMap.size();
+
+  return hidl_lc3_codec_config;
+}
+
+inline LeAudioConfig_2_2 to_hidl_leaudio_config_2_2(
+    const LeAudioConfiguration& leaudio_config) {
+  LeAudioConfig_2_2 hidl_leaudio_config;
+  if (leaudio_mode_to_hidl_map.find(leaudio_config.mode) !=
+      leaudio_mode_to_hidl_map.end()) {
+    hidl_leaudio_config.mode = leaudio_mode_to_hidl_map.at(leaudio_config.mode);
+  }
+
+  if (leaudio_config.modeConfig.getTag() ==
+      LeAudioConfiguration::LeAudioModeConfig::unicastConfig) {
+    auto& unicast_config =
+        leaudio_config.modeConfig
+            .get<LeAudioConfiguration::LeAudioModeConfig::unicastConfig>();
+    ::android::hardware::bluetooth::audio::V2_2::UnicastConfig
+        hidl_unicast_config;
+    hidl_unicast_config.peerDelay =
+        static_cast<uint32_t>(unicast_config.peerDelay);
+
+    auto& lc3_config = unicast_config.leAudioCodecConfig
+                           .get<LeAudioCodecConfiguration::lc3Config>();
+    hidl_unicast_config.lc3Config = to_hidl_lc3_config_2_1(lc3_config);
+
+    hidl_unicast_config.streamMap.resize(unicast_config.streamMap.size());
+    for (int i = 0; i < unicast_config.streamMap.size(); i++) {
+      hidl_unicast_config.streamMap[i].audioChannelAllocation =
+          static_cast<uint32_t>(
+              unicast_config.streamMap[i].audioChannelAllocation);
+      hidl_unicast_config.streamMap[i].streamHandle =
+          static_cast<uint16_t>(unicast_config.streamMap[i].streamHandle);
+    }
+  } else if (leaudio_config.modeConfig.getTag() ==
+             LeAudioConfiguration::LeAudioModeConfig::broadcastConfig) {
+    auto bcast_config =
+        leaudio_config.modeConfig
+            .get<LeAudioConfiguration::LeAudioModeConfig::broadcastConfig>();
+    ::android::hardware::bluetooth::audio::V2_2::BroadcastConfig
+        hidl_bcast_config;
+    hidl_bcast_config.streamMap.resize(bcast_config.streamMap.size());
+    for (int i = 0; i < bcast_config.streamMap.size(); i++) {
+      hidl_bcast_config.streamMap[i].audioChannelAllocation =
+          static_cast<uint32_t>(
+              bcast_config.streamMap[i].audioChannelAllocation);
+      hidl_bcast_config.streamMap[i].streamHandle =
+          static_cast<uint16_t>(bcast_config.streamMap[i].streamHandle);
+      hidl_bcast_config.streamMap[i].lc3Config = to_hidl_lc3_config_2_1(
+          bcast_config.streamMap[i]
+              .leAudioCodecConfig.get<LeAudioCodecConfiguration::lc3Config>());
+    }
+  }
+  return hidl_leaudio_config;
+}
+
+inline AudioConfig_2_1 to_hidl_audio_config_2_1(
+    const AudioConfiguration& audio_config) {
+  AudioConfig_2_1 hidl_audio_config;
+  switch (audio_config.getTag()) {
+    case AudioConfiguration::pcmConfig:
+      hidl_audio_config.pcmConfig(to_hidl_pcm_config_2_1(
+          audio_config.get<AudioConfiguration::pcmConfig>()));
+      break;
+    case AudioConfiguration::a2dpConfig:
+      hidl_audio_config.codecConfig(to_hidl_codec_config_2_0(
+          audio_config.get<AudioConfiguration::a2dpConfig>()));
+      break;
+    case AudioConfiguration::leAudioConfig:
+      hidl_audio_config.leAudioCodecConfig(to_hidl_leaudio_config_2_1(
+          audio_config.get<AudioConfiguration::leAudioConfig>()));
+      break;
+  }
+  return hidl_audio_config;
+}
+
+inline AudioConfig_2_2 to_hidl_audio_config_2_2(
+    const AudioConfiguration& audio_config) {
+  AudioConfig_2_2 hidl_audio_config;
+  switch (audio_config.getTag()) {
+    case AudioConfiguration::pcmConfig:
+      hidl_audio_config.pcmConfig(to_hidl_pcm_config_2_1(
+          audio_config.get<AudioConfiguration::pcmConfig>()));
+      break;
+    case AudioConfiguration::a2dpConfig:
+      hidl_audio_config.codecConfig(to_hidl_codec_config_2_0(
+          audio_config.get<AudioConfiguration::a2dpConfig>()));
+      break;
+    case AudioConfiguration::leAudioConfig:
+      hidl_audio_config.leAudioConfig(to_hidl_leaudio_config_2_2(
+          audio_config.get<AudioConfiguration::leAudioConfig>()));
+      break;
+  }
+  return hidl_audio_config;
+}
+
+/***
+ *
+ * 2.0
+ *
+ ***/
+
+bool HidlToAidlMiddleware_2_0::IsSessionReady(
+    const SessionType_2_0& session_type) {
+  return BluetoothAudioSessionControl::IsSessionReady(
+      from_session_type_2_0(session_type));
+}
+
+uint16_t HidlToAidlMiddleware_2_0::RegisterControlResultCback(
+    const SessionType_2_0& session_type,
+    const PortStatusCallbacks_2_0& cbacks) {
+  PortStatusCallbacks_2_2 callback_2_2{
+      .control_result_cb_ = cbacks.control_result_cb_,
+      .session_changed_cb_ = cbacks.session_changed_cb_,
+  };
+  return HidlToAidlMiddleware_2_2::RegisterControlResultCback(
+      static_cast<SessionType_2_1>(session_type), callback_2_2);
+}
+
+void HidlToAidlMiddleware_2_0::UnregisterControlResultCback(
+    const SessionType_2_0& session_type, uint16_t cookie) {
+  HidlToAidlMiddleware_2_2::UnregisterControlResultCback(
+      static_cast<SessionType_2_1>(session_type), cookie);
+}
+
+const AudioConfig_2_0 HidlToAidlMiddleware_2_0::GetAudioConfig(
+    const SessionType_2_0& session_type) {
+  return to_hidl_audio_config_2_0(BluetoothAudioSessionControl::GetAudioConfig(
+      from_session_type_2_0(session_type)));
+}
+
+bool HidlToAidlMiddleware_2_0::StartStream(
+    const SessionType_2_0& session_type) {
+  return BluetoothAudioSessionControl::StartStream(
+      from_session_type_2_0(session_type));
+}
+
+void HidlToAidlMiddleware_2_0::StopStream(const SessionType_2_0& session_type) {
+  return BluetoothAudioSessionControl::StopStream(
+      from_session_type_2_0(session_type));
+}
+
+bool HidlToAidlMiddleware_2_0::SuspendStream(
+    const SessionType_2_0& session_type) {
+  return BluetoothAudioSessionControl::SuspendStream(
+      from_session_type_2_0(session_type));
+}
+
+bool HidlToAidlMiddleware_2_0::GetPresentationPosition(
+    const SessionType_2_0& session_type, uint64_t* remote_delay_report_ns,
+    uint64_t* total_bytes_readed, timespec* data_position) {
+  PresentationPosition presentation_position;
+  auto ret_val = BluetoothAudioSessionControl::GetPresentationPosition(
+      from_session_type_2_0(session_type), presentation_position);
+  if (remote_delay_report_ns)
+    *remote_delay_report_ns = presentation_position.remoteDeviceAudioDelayNanos;
+  if (total_bytes_readed)
+    *total_bytes_readed = presentation_position.transmittedOctets;
+  if (data_position)
+    *data_position = {
+        .tv_sec = static_cast<__kernel_old_time_t>(
+            presentation_position.transmittedOctetsTimestamp.tvSec),
+        .tv_nsec = static_cast<long>(
+            presentation_position.transmittedOctetsTimestamp.tvNSec)};
+  return ret_val;
+}
+
+void HidlToAidlMiddleware_2_0::UpdateTracksMetadata(
+    const SessionType_2_0& session_type,
+    const struct source_metadata* source_metadata) {
+  return BluetoothAudioSessionControl::UpdateSourceMetadata(
+      from_session_type_2_0(session_type), *source_metadata);
+}
+
+size_t HidlToAidlMiddleware_2_0::OutWritePcmData(
+    const SessionType_2_0& session_type, const void* buffer, size_t bytes) {
+  return BluetoothAudioSessionControl::OutWritePcmData(
+      from_session_type_2_0(session_type), buffer, bytes);
+}
+
+bool HidlToAidlMiddleware_2_0::IsAidlAvailable() {
+  return BluetoothAudioSession::IsAidlAvailable();
+}
+
+/***
+ *
+ * 2.1
+ *
+ ***/
+
+const AudioConfig_2_1 HidlToAidlMiddleware_2_1::GetAudioConfig(
+    const SessionType_2_1& session_type) {
+  return to_hidl_audio_config_2_1(BluetoothAudioSessionControl::GetAudioConfig(
+      from_session_type_2_1(session_type)));
+}
+
+/***
+ *
+ * 2.2
+ *
+ ***/
+
+bool HidlToAidlMiddleware_2_2::IsSessionReady(
+    const SessionType_2_1& session_type) {
+  return BluetoothAudioSessionControl::IsSessionReady(
+      from_session_type_2_1(session_type));
+}
+
+uint16_t HidlToAidlMiddleware_2_2::RegisterControlResultCback(
+    const SessionType_2_1& session_type,
+    const PortStatusCallbacks_2_2& cbacks) {
+  LOG(INFO) << __func__ << ": " << toString(session_type);
+  auto aidl_session_type = from_session_type_2_1(session_type);
+  // Pass the exact reference to the lambda
+  auto& session_legacy_callback_table =
+      legacy_callback_table[aidl_session_type];
+  PortStatusCallbacks aidl_callbacks{};
+  if (cbacks.control_result_cb_) {
+    aidl_callbacks.control_result_cb_ =
+        [&session_legacy_callback_table](uint16_t cookie, bool start_resp,
+                                         const BluetoothAudioStatus& status) {
+          if (session_legacy_callback_table.find(cookie) ==
+              session_legacy_callback_table.end()) {
+            LOG(ERROR) << __func__ << ": Unknown callback invoked!";
+            return;
+          }
+          auto& cback = session_legacy_callback_table[cookie];
+          cback->control_result_cb_(cookie, start_resp, to_hidl_status(status));
+        };
+  }
+  if (cbacks.session_changed_cb_) {
+    aidl_callbacks.session_changed_cb_ =
+        [&session_legacy_callback_table](uint16_t cookie) {
+          if (session_legacy_callback_table.find(cookie) ==
+              session_legacy_callback_table.end()) {
+            LOG(ERROR) << __func__ << ": Unknown callback invoked!";
+            return;
+          }
+          auto& cback = session_legacy_callback_table[cookie];
+          cback->session_changed_cb_(cookie);
+        };
+  };
+  if (cbacks.audio_configuration_changed_cb_) {
+    aidl_callbacks.audio_configuration_changed_cb_ =
+        [&session_legacy_callback_table](uint16_t cookie) {
+          if (session_legacy_callback_table.find(cookie) ==
+              session_legacy_callback_table.end()) {
+            LOG(ERROR) << __func__ << ": Unknown callback invoked!";
+            return;
+          }
+          auto& cback = session_legacy_callback_table[cookie];
+          cback->audio_configuration_changed_cb_(cookie);
+        };
+  };
+  auto cookie = BluetoothAudioSessionControl::RegisterControlResultCback(
+      aidl_session_type, aidl_callbacks);
+  {
+    std::lock_guard<std::mutex> guard(legacy_callback_lock);
+    session_legacy_callback_table[cookie] =
+        std::make_shared<PortStatusCallbacks_2_2>(cbacks);
+  }
+  return cookie;
+}
+
+void HidlToAidlMiddleware_2_2::UnregisterControlResultCback(
+    const SessionType_2_1& session_type, uint16_t cookie) {
+  LOG(INFO) << __func__ << ": " << toString(session_type);
+  auto aidl_session_type = from_session_type_2_1(session_type);
+  BluetoothAudioSessionControl::UnregisterControlResultCback(aidl_session_type,
+                                                             cookie);
+  auto& session_callback_table = legacy_callback_table[aidl_session_type];
+  if (session_callback_table.find(cookie) != session_callback_table.end()) {
+    std::lock_guard<std::mutex> guard(legacy_callback_lock);
+    session_callback_table.erase(cookie);
+  }
+}
+
+const AudioConfig_2_2 HidlToAidlMiddleware_2_2::GetAudioConfig(
+    const SessionType_2_1& session_type) {
+  return to_hidl_audio_config_2_2(BluetoothAudioSessionControl::GetAudioConfig(
+      from_session_type_2_1(session_type)));
+}
+
+bool HidlToAidlMiddleware_2_2::StartStream(
+    const SessionType_2_1& session_type) {
+  return BluetoothAudioSessionControl::StartStream(
+      from_session_type_2_1(session_type));
+}
+
+bool HidlToAidlMiddleware_2_2::SuspendStream(
+    const SessionType_2_1& session_type) {
+  return BluetoothAudioSessionControl::SuspendStream(
+      from_session_type_2_1(session_type));
+}
+
+void HidlToAidlMiddleware_2_2::StopStream(const SessionType_2_1& session_type) {
+  return BluetoothAudioSessionControl::StopStream(
+      from_session_type_2_1(session_type));
+}
+
+void HidlToAidlMiddleware_2_2::UpdateSinkMetadata(
+    const SessionType_2_1& session_type,
+    const struct sink_metadata* sink_metadata) {
+  return BluetoothAudioSessionControl::UpdateSinkMetadata(
+      from_session_type_2_1(session_type), *sink_metadata);
+}
+
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace hardware
+}  // namespace android
+}  // namespace aidl
diff --git a/bluetooth/audio/utils/aidl_session/HidlToAidlMiddleware_2_0.h b/bluetooth/audio/utils/aidl_session/HidlToAidlMiddleware_2_0.h
new file mode 100644
index 0000000..d10ee37
--- /dev/null
+++ b/bluetooth/audio/utils/aidl_session/HidlToAidlMiddleware_2_0.h
@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <android/hardware/bluetooth/audio/2.0/types.h>
+
+#include "../session/BluetoothAudioSession.h"
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace bluetooth {
+namespace audio {
+
+using SessionType_2_0 =
+    ::android::hardware::bluetooth::audio::V2_0::SessionType;
+using PortStatusCallbacks_2_0 =
+    ::android::bluetooth::audio::PortStatusCallbacks;
+using AudioConfig_2_0 =
+    ::android::hardware::bluetooth::audio::V2_0::AudioConfiguration;
+
+class HidlToAidlMiddleware_2_0 {
+ public:
+  static bool IsAidlAvailable();
+
+  static bool IsSessionReady(const SessionType_2_0& session_type);
+
+  static uint16_t RegisterControlResultCback(
+      const SessionType_2_0& session_type,
+      const PortStatusCallbacks_2_0& cbacks);
+
+  static void UnregisterControlResultCback(const SessionType_2_0& session_type,
+                                           uint16_t cookie);
+
+  static const AudioConfig_2_0 GetAudioConfig(
+      const SessionType_2_0& session_type);
+
+  static bool StartStream(const SessionType_2_0& session_type);
+
+  static void StopStream(const SessionType_2_0& session_type);
+
+  static bool SuspendStream(const SessionType_2_0& session_type);
+
+  static bool GetPresentationPosition(const SessionType_2_0& session_type,
+                                      uint64_t* remote_delay_report_ns,
+                                      uint64_t* total_bytes_readed,
+                                      timespec* data_position);
+
+  static void UpdateTracksMetadata(
+      const SessionType_2_0& session_type,
+      const struct source_metadata* source_metadata);
+
+  static size_t OutWritePcmData(const SessionType_2_0& session_type,
+                                const void* buffer, size_t bytes);
+};
+
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace hardware
+}  // namespace android
+}  // namespace aidl
diff --git a/bluetooth/audio/utils/aidl_session/HidlToAidlMiddleware_2_1.h b/bluetooth/audio/utils/aidl_session/HidlToAidlMiddleware_2_1.h
new file mode 100644
index 0000000..82dce96
--- /dev/null
+++ b/bluetooth/audio/utils/aidl_session/HidlToAidlMiddleware_2_1.h
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <android/hardware/bluetooth/audio/2.1/types.h>
+
+#include "../session/BluetoothAudioSession.h"
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace bluetooth {
+namespace audio {
+
+using SessionType_2_1 =
+    ::android::hardware::bluetooth::audio::V2_1::SessionType;
+using AudioConfig_2_1 =
+    ::android::hardware::bluetooth::audio::V2_1::AudioConfiguration;
+
+class HidlToAidlMiddleware_2_1 {
+ public:
+  static const AudioConfig_2_1 GetAudioConfig(
+      const SessionType_2_1& session_type);
+};
+
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace hardware
+}  // namespace android
+}  // namespace aidl
diff --git a/bluetooth/audio/utils/aidl_session/HidlToAidlMiddleware_2_2.h b/bluetooth/audio/utils/aidl_session/HidlToAidlMiddleware_2_2.h
new file mode 100644
index 0000000..149e404
--- /dev/null
+++ b/bluetooth/audio/utils/aidl_session/HidlToAidlMiddleware_2_2.h
@@ -0,0 +1,65 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <android/hardware/bluetooth/audio/2.2/types.h>
+
+#include "../session/BluetoothAudioSession.h"
+#include "../session/BluetoothAudioSession_2_2.h"
+
+namespace aidl {
+namespace android {
+namespace hardware {
+namespace bluetooth {
+namespace audio {
+
+using SessionType_2_1 =
+    ::android::hardware::bluetooth::audio::V2_1::SessionType;
+using PortStatusCallbacks_2_0 =
+    ::android::bluetooth::audio::PortStatusCallbacks;
+using PortStatusCallbacks_2_2 =
+    ::android::bluetooth::audio::PortStatusCallbacks_2_2;
+using AudioConfig_2_2 =
+    ::android::hardware::bluetooth::audio::V2_2::AudioConfiguration;
+
+class HidlToAidlMiddleware_2_2 {
+ public:
+  static bool IsSessionReady(const SessionType_2_1& session_type);
+
+  static uint16_t RegisterControlResultCback(
+      const SessionType_2_1& session_type,
+      const PortStatusCallbacks_2_2& cbacks);
+
+  static void UnregisterControlResultCback(const SessionType_2_1& session_type,
+                                           uint16_t cookie);
+
+  static const AudioConfig_2_2 GetAudioConfig(
+      const SessionType_2_1& session_type);
+
+  static bool StartStream(const SessionType_2_1& session_type);
+
+  static bool SuspendStream(const SessionType_2_1& session_type);
+
+  static void StopStream(const SessionType_2_1& session_type);
+
+  static void UpdateSinkMetadata(const SessionType_2_1& session_type,
+                                 const struct sink_metadata* sink_metadata);
+};
+
+}  // namespace audio
+}  // namespace bluetooth
+}  // namespace hardware
+}  // namespace android
+}  // namespace aidl
diff --git a/bluetooth/audio/utils/session/BluetoothAudioSession.cpp b/bluetooth/audio/utils/session/BluetoothAudioSession.cpp
index 2f3ddaf..6d5608b 100644
--- a/bluetooth/audio/utils/session/BluetoothAudioSession.cpp
+++ b/bluetooth/audio/utils/session/BluetoothAudioSession.cpp
@@ -21,10 +21,13 @@
 #include <android-base/logging.h>
 #include <android-base/stringprintf.h>
 
+#include "../aidl_session/HidlToAidlMiddleware_2_0.h"
+
 namespace android {
 namespace bluetooth {
 namespace audio {
 
+using ::aidl::android::hardware::bluetooth::audio::HidlToAidlMiddleware_2_0;
 using ::android::hardware::audio::common::V5_0::AudioContentType;
 using ::android::hardware::audio::common::V5_0::AudioUsage;
 using ::android::hardware::audio::common::V5_0::PlaybackTrackMetadata;
@@ -149,6 +152,8 @@
 // The function helps to check if this session is ready or not
 // @return: true if the Bluetooth stack has started the specified session
 bool BluetoothAudioSession::IsSessionReady() {
+  if (HidlToAidlMiddleware_2_0::IsAidlAvailable())
+    return HidlToAidlMiddleware_2_0::IsSessionReady(session_type_);
   std::lock_guard<std::recursive_mutex> guard(mutex_);
   bool dataMQ_valid =
       (session_type_ == SessionType::A2DP_HARDWARE_OFFLOAD_DATAPATH ||
@@ -200,6 +205,9 @@
 // @return: cookie - the assigned number to this bluetooth_audio output
 uint16_t BluetoothAudioSession::RegisterStatusCback(
     const PortStatusCallbacks& cbacks) {
+  if (HidlToAidlMiddleware_2_0::IsAidlAvailable())
+    return HidlToAidlMiddleware_2_0::RegisterControlResultCback(session_type_,
+                                                                cbacks);
   std::lock_guard<std::recursive_mutex> guard(mutex_);
   uint16_t cookie = ObserversCookieGetInitValue(session_type_);
   uint16_t cookie_upper_bound = ObserversCookieGetUpperBound(session_type_);
@@ -227,6 +235,9 @@
 // PortStatusCallbacks
 // @param: cookie - indicates which bluetooth_audio output is
 void BluetoothAudioSession::UnregisterStatusCback(uint16_t cookie) {
+  if (HidlToAidlMiddleware_2_0::IsAidlAvailable())
+    return HidlToAidlMiddleware_2_0::UnregisterControlResultCback(session_type_,
+                                                                  cookie);
   std::lock_guard<std::recursive_mutex> guard(mutex_);
   if (observers_.erase(cookie) != 1) {
     LOG(WARNING) << __func__ << " - SessionType=" << toString(session_type_)
@@ -238,6 +249,9 @@
 // The control function is for the bluetooth_audio module to get the current
 // AudioConfiguration
 const AudioConfiguration& BluetoothAudioSession::GetAudioConfig() {
+  if (HidlToAidlMiddleware_2_0::IsAidlAvailable())
+    return (audio_config_ =
+                HidlToAidlMiddleware_2_0::GetAudioConfig(session_type_));
   std::lock_guard<std::recursive_mutex> guard(mutex_);
   if (IsSessionReady()) {
     return audio_config_;
@@ -251,6 +265,8 @@
 // Those control functions are for the bluetooth_audio module to start, suspend,
 // stop stream, to check position, and to update metadata.
 bool BluetoothAudioSession::StartStream() {
+  if (HidlToAidlMiddleware_2_0::IsAidlAvailable())
+    return HidlToAidlMiddleware_2_0::StartStream(session_type_);
   std::lock_guard<std::recursive_mutex> guard(mutex_);
   if (!IsSessionReady()) {
     LOG(DEBUG) << __func__ << " - SessionType=" << toString(session_type_)
@@ -267,6 +283,8 @@
 }
 
 bool BluetoothAudioSession::SuspendStream() {
+  if (HidlToAidlMiddleware_2_0::IsAidlAvailable())
+    return HidlToAidlMiddleware_2_0::SuspendStream(session_type_);
   std::lock_guard<std::recursive_mutex> guard(mutex_);
   if (!IsSessionReady()) {
     LOG(DEBUG) << __func__ << " - SessionType=" << toString(session_type_)
@@ -283,6 +301,8 @@
 }
 
 void BluetoothAudioSession::StopStream() {
+  if (HidlToAidlMiddleware_2_0::IsAidlAvailable())
+    return HidlToAidlMiddleware_2_0::StopStream(session_type_);
   std::lock_guard<std::recursive_mutex> guard(mutex_);
   if (!IsSessionReady()) {
     return;
@@ -297,6 +317,10 @@
 bool BluetoothAudioSession::GetPresentationPosition(
     uint64_t* remote_delay_report_ns, uint64_t* total_bytes_readed,
     timespec* data_position) {
+  if (HidlToAidlMiddleware_2_0::IsAidlAvailable())
+    return HidlToAidlMiddleware_2_0::GetPresentationPosition(
+        session_type_, remote_delay_report_ns, total_bytes_readed,
+        data_position);
   std::lock_guard<std::recursive_mutex> guard(mutex_);
   if (!IsSessionReady()) {
     LOG(DEBUG) << __func__ << " - SessionType=" << toString(session_type_)
@@ -330,6 +354,9 @@
 
 void BluetoothAudioSession::UpdateTracksMetadata(
     const struct source_metadata* source_metadata) {
+  if (HidlToAidlMiddleware_2_0::IsAidlAvailable())
+    return HidlToAidlMiddleware_2_0::UpdateTracksMetadata(session_type_,
+                                                          source_metadata);
   std::lock_guard<std::recursive_mutex> guard(mutex_);
   if (!IsSessionReady()) {
     LOG(DEBUG) << __func__ << " - SessionType=" << toString(session_type_)
@@ -374,6 +401,9 @@
 // The control function writes stream to FMQ
 size_t BluetoothAudioSession::OutWritePcmData(const void* buffer,
                                               size_t bytes) {
+  if (HidlToAidlMiddleware_2_0::IsAidlAvailable())
+    return HidlToAidlMiddleware_2_0::OutWritePcmData(session_type_, buffer,
+                                                     bytes);
   if (buffer == nullptr || !bytes) return 0;
   size_t totalWritten = 0;
   int ms_timeout = kFmqSendTimeoutMs;
diff --git a/bluetooth/audio/utils/session/BluetoothAudioSession_2_1.cpp b/bluetooth/audio/utils/session/BluetoothAudioSession_2_1.cpp
index bf1f9b5..276a291 100644
--- a/bluetooth/audio/utils/session/BluetoothAudioSession_2_1.cpp
+++ b/bluetooth/audio/utils/session/BluetoothAudioSession_2_1.cpp
@@ -21,9 +21,14 @@
 #include <android-base/logging.h>
 #include <android-base/stringprintf.h>
 
+#include "../aidl_session/HidlToAidlMiddleware_2_0.h"
+#include "../aidl_session/HidlToAidlMiddleware_2_1.h"
+
 namespace android {
 namespace bluetooth {
 namespace audio {
+using ::aidl::android::hardware::bluetooth::audio::HidlToAidlMiddleware_2_0;
+using ::aidl::android::hardware::bluetooth::audio::HidlToAidlMiddleware_2_1;
 using SessionType_2_1 =
     ::android::hardware::bluetooth::audio::V2_1::SessionType;
 using SessionType_2_0 =
@@ -72,6 +77,7 @@
   } else {
     session_type_2_1_ = (session_type);
   }
+  raw_session_type_ = session_type;
 }
 
 std::shared_ptr<BluetoothAudioSession>
@@ -83,6 +89,8 @@
 // AudioConfiguration
 const ::android::hardware::bluetooth::audio::V2_1::AudioConfiguration
 BluetoothAudioSession_2_1::GetAudioConfig() {
+  if (HidlToAidlMiddleware_2_0::IsAidlAvailable())
+    return HidlToAidlMiddleware_2_1::GetAudioConfig(raw_session_type_);
   std::lock_guard<std::recursive_mutex> guard(audio_session->mutex_);
   if (audio_session->IsSessionReady()) {
     // If session is unknown it means it should be 2.0 type
diff --git a/bluetooth/audio/utils/session/BluetoothAudioSession_2_1.h b/bluetooth/audio/utils/session/BluetoothAudioSession_2_1.h
index 5a35153..e634064 100644
--- a/bluetooth/audio/utils/session/BluetoothAudioSession_2_1.h
+++ b/bluetooth/audio/utils/session/BluetoothAudioSession_2_1.h
@@ -31,6 +31,7 @@
   std::shared_ptr<BluetoothAudioSession> audio_session;
 
   ::android::hardware::bluetooth::audio::V2_1::SessionType session_type_2_1_;
+  ::android::hardware::bluetooth::audio::V2_1::SessionType raw_session_type_;
 
   // audio data configuration for both software and offloading
   ::android::hardware::bluetooth::audio::V2_1::AudioConfiguration
diff --git a/bluetooth/audio/utils/session/BluetoothAudioSession_2_2.cpp b/bluetooth/audio/utils/session/BluetoothAudioSession_2_2.cpp
index 60ac4ec..4613ddc 100644
--- a/bluetooth/audio/utils/session/BluetoothAudioSession_2_2.cpp
+++ b/bluetooth/audio/utils/session/BluetoothAudioSession_2_2.cpp
@@ -22,10 +22,15 @@
 #include <android-base/stringprintf.h>
 #include <android/hardware/bluetooth/audio/2.2/IBluetoothAudioPort.h>
 
+#include "../aidl_session/HidlToAidlMiddleware_2_0.h"
+#include "../aidl_session/HidlToAidlMiddleware_2_2.h"
+
 namespace android {
 namespace bluetooth {
 namespace audio {
 
+using ::aidl::android::hardware::bluetooth::audio::HidlToAidlMiddleware_2_0;
+using ::aidl::android::hardware::bluetooth::audio::HidlToAidlMiddleware_2_2;
 using ::android::hardware::audio::common::V5_0::AudioSource;
 using ::android::hardware::audio::common::V5_0::RecordTrackMetadata;
 using ::android::hardware::audio::common::V5_0::SinkMetadata;
@@ -93,6 +98,7 @@
   } else {
     session_type_2_1_ = (session_type);
   }
+  raw_session_type_ = session_type;
   invalidSoftwareAudioConfiguration.pcmConfig(kInvalidPcmParameters);
   invalidOffloadAudioConfiguration.codecConfig(
       audio_session->kInvalidCodecConfiguration);
@@ -100,6 +106,8 @@
 }
 
 bool BluetoothAudioSession_2_2::IsSessionReady() {
+  if (HidlToAidlMiddleware_2_0::IsAidlAvailable())
+    return HidlToAidlMiddleware_2_2::IsSessionReady(raw_session_type_);
   if (session_type_2_1_ !=
           SessionType_2_1::LE_AUDIO_HARDWARE_OFFLOAD_ENCODING_DATAPATH &&
       session_type_2_1_ !=
@@ -122,6 +130,9 @@
 
 void BluetoothAudioSession_2_2::UpdateSinkMetadata(
     const struct sink_metadata* sink_metadata) {
+  if (HidlToAidlMiddleware_2_0::IsAidlAvailable())
+    return HidlToAidlMiddleware_2_2::UpdateSinkMetadata(raw_session_type_,
+                                                        sink_metadata);
   std::lock_guard<std::recursive_mutex> guard(audio_session->mutex_);
   if (!IsSessionReady()) {
     LOG(DEBUG) << __func__ << " - SessionType=" << toString(session_type_2_1_)
@@ -172,6 +183,8 @@
 // AudioConfiguration
 const ::android::hardware::bluetooth::audio::V2_2::AudioConfiguration
 BluetoothAudioSession_2_2::GetAudioConfig() {
+  if (HidlToAidlMiddleware_2_0::IsAidlAvailable())
+    return HidlToAidlMiddleware_2_2::GetAudioConfig(raw_session_type_);
   std::lock_guard<std::recursive_mutex> guard(audio_session->mutex_);
   if (IsSessionReady()) {
     auto audio_config_discriminator = audio_config_2_2_.getDiscriminator();
@@ -226,6 +239,8 @@
 // Those control functions are for the bluetooth_audio module to start, suspend,
 // stop stream, to check position, and to update metadata.
 bool BluetoothAudioSession_2_2::StartStream() {
+  if (HidlToAidlMiddleware_2_0::IsAidlAvailable())
+    return HidlToAidlMiddleware_2_2::StartStream(raw_session_type_);
   std::lock_guard<std::recursive_mutex> guard(audio_session->mutex_);
   if (!IsSessionReady()) {
     LOG(DEBUG) << __func__ << " - SessionType=" << toString(session_type_2_1_)
@@ -242,6 +257,8 @@
 }
 
 bool BluetoothAudioSession_2_2::SuspendStream() {
+  if (HidlToAidlMiddleware_2_0::IsAidlAvailable())
+    return HidlToAidlMiddleware_2_2::SuspendStream(raw_session_type_);
   std::lock_guard<std::recursive_mutex> guard(audio_session->mutex_);
   if (!IsSessionReady()) {
     LOG(DEBUG) << __func__ << " - SessionType=" << toString(session_type_2_1_)
@@ -258,6 +275,8 @@
 }
 
 void BluetoothAudioSession_2_2::StopStream() {
+  if (HidlToAidlMiddleware_2_0::IsAidlAvailable())
+    return HidlToAidlMiddleware_2_2::StopStream(raw_session_type_);
   std::lock_guard<std::recursive_mutex> guard(audio_session->mutex_);
   if (!IsSessionReady()) {
     return;
@@ -395,6 +414,9 @@
 // @return: cookie - the assigned number to this bluetooth_audio output
 uint16_t BluetoothAudioSession_2_2::RegisterStatusCback(
     const PortStatusCallbacks_2_2& cbacks) {
+  if (HidlToAidlMiddleware_2_0::IsAidlAvailable())
+    return HidlToAidlMiddleware_2_2::RegisterControlResultCback(
+        raw_session_type_, cbacks);
   if (session_type_2_1_ !=
           SessionType_2_1::LE_AUDIO_HARDWARE_OFFLOAD_ENCODING_DATAPATH &&
       session_type_2_1_ !=
@@ -432,6 +454,9 @@
 // PortStatusCallbacks_2_2
 // @param: cookie - indicates which bluetooth_audio output is
 void BluetoothAudioSession_2_2::UnregisterStatusCback(uint16_t cookie) {
+  if (HidlToAidlMiddleware_2_0::IsAidlAvailable())
+    return HidlToAidlMiddleware_2_2::UnregisterControlResultCback(
+        raw_session_type_, cookie);
   std::lock_guard<std::recursive_mutex> guard(audio_session->mutex_);
   if (session_type_2_1_ !=
           SessionType_2_1::LE_AUDIO_HARDWARE_OFFLOAD_ENCODING_DATAPATH &&
diff --git a/bluetooth/audio/utils/session/BluetoothAudioSession_2_2.h b/bluetooth/audio/utils/session/BluetoothAudioSession_2_2.h
index 3673fd8..b6f96ab 100644
--- a/bluetooth/audio/utils/session/BluetoothAudioSession_2_2.h
+++ b/bluetooth/audio/utils/session/BluetoothAudioSession_2_2.h
@@ -68,6 +68,7 @@
   std::shared_ptr<BluetoothAudioSession_2_1> audio_session_2_1;
 
   ::android::hardware::bluetooth::audio::V2_1::SessionType session_type_2_1_;
+  ::android::hardware::bluetooth::audio::V2_1::SessionType raw_session_type_;
 
   // audio data configuration for both software and offloading
   ::android::hardware::bluetooth::audio::V2_2::AudioConfiguration