path: root/system/profile/avrcp/connection_handler.cc

/*
 * 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.
 */

#define LOG_TAG "avrcp"

#include "connection_handler.h"

#include <base/functional/bind.h>
#include <bluetooth/log.h>
#include <com_android_bluetooth_flags.h>

#include <map>
#include <mutex>

#include "avrc_defs.h"
#include "avrcp_message_converter.h"
#include "bta/include/bta_av_api.h"
#include "device/include/interop.h"
#include "internal_include/bt_target.h"
#include "osi/include/allocator.h"
#include "osi/include/properties.h"
#include "packet/avrcp/avrcp_packet.h"
#include "stack/include/bt_hdr.h"
#include "stack/include/bt_uuid16.h"
#include "stack/include/sdp_status.h"
#include "types/raw_address.h"

extern bool btif_av_peer_is_connected_sink(const RawAddress& peer_address);
extern bool btif_av_peer_is_connected_source(const RawAddress& peer_address);
extern bool btif_av_both_enable(void);
extern bool btif_av_src_sink_coexist_enabled(void);
extern bool btif_av_peer_is_source(const RawAddress& peer_address);

namespace bluetooth {
namespace avrcp {

ConnectionHandler* ConnectionHandler::instance_ = nullptr;

// ConnectionHandler::CleanUp take the lock and calls
// ConnectionHandler::AcceptorControlCB with AVRC_CLOSE_IND_EVT
// which also takes the lock, so use a recursive_mutex.
std::recursive_mutex device_map_lock;

ConnectionHandler* ConnectionHandler::Get() {
  log::assert_that(instance_ != nullptr, "assert failed: instance_ != nullptr");

  return instance_;
}

static bool IsAbsoluteVolumeEnabled(const RawAddress* bdaddr) {
  char volume_disabled[PROPERTY_VALUE_MAX] = {0};
  osi_property_get("persist.bluetooth.disableabsvol", volume_disabled, "false");
  if (strncmp(volume_disabled, "true", 4) == 0) {
    log::info("Absolute volume disabled by property");
    return false;
  }
  if (interop_match_addr(INTEROP_DISABLE_ABSOLUTE_VOLUME, bdaddr)) {
    log::info("Absolute volume disabled by IOP table");
    return false;
  }
  return true;
}

bool ConnectionHandler::Initialize(const ConnectionCallback& callback, AvrcpInterface* avrcp,
                                   SdpInterface* sdp, VolumeInterface* vol) {
  log::assert_that(instance_ == nullptr, "assert failed: instance_ == nullptr");
  log::assert_that(avrcp != nullptr, "assert failed: avrcp != nullptr");
  log::assert_that(sdp != nullptr, "assert failed: sdp != nullptr");

  // TODO (apanicke): When transitioning to using this service, implement
  // SDP Initialization for AVRCP Here.
  instance_ = new ConnectionHandler();
  instance_->connection_cb_ = callback;
  instance_->avrc_ = avrcp;
  instance_->sdp_ = sdp;
  instance_->vol_ = vol;

  // Set up the AVRCP acceptor connection
  if (!instance_->AvrcpConnect(false, RawAddress::kAny)) {
    instance_->CleanUp();
    return false;
  }

  return true;
}

bool ConnectionHandler::CleanUp() {
  log::assert_that(instance_ != nullptr, "assert failed: instance_ != nullptr");

  // TODO (apanicke): Cleanup the SDP Entries here
  std::lock_guard<std::recursive_mutex> lock(device_map_lock);
  for (auto entry = instance_->device_map_.begin(); entry != instance_->device_map_.end();) {
    auto curr = entry;
    entry++;
    curr->second->DeviceDisconnected();
    instance_->avrc_->Close(curr->first);
  }
  instance_->device_map_.clear();
  instance_->feature_map_.clear();

  instance_->weak_ptr_factory_.InvalidateWeakPtrs();

  delete instance_;
  instance_ = nullptr;

  return true;
}

void ConnectionHandler::InitForTesting(ConnectionHandler* handler) {
  log::assert_that(instance_ == nullptr, "assert failed: instance_ == nullptr");
  instance_ = handler;
}

bool ConnectionHandler::ConnectDevice(const RawAddress& bdaddr) {
  log::info("Attempting to connect to device {}", bdaddr);

  for (const auto& pair : device_map_) {
    if (bdaddr == pair.second->GetAddress()) {
      log::warn("Already connected to device with address {}", bdaddr);
      return false;
    }
  }

  auto connection_lambda = [](ConnectionHandler* instance_, const RawAddress& bdaddr,
                              tSDP_STATUS status, uint16_t /*version*/, uint16_t features) {
    log::info("SDP Completed features=0x{:x}", features);
    if (status != tSDP_STATUS::SDP_SUCCESS || !(features & BTA_AV_FEAT_RCCT)) {
      log::error(
              "Failed to do SDP: status=0x{:x} features=0x{:x} supports "
              "controller: {}",
              status, features, features & BTA_AV_FEAT_RCCT);
      instance_->connection_cb_.Run(std::shared_ptr<Device>());
    }

    instance_->feature_map_[bdaddr] = features;

    if (com::android::bluetooth::flags::abs_volume_sdp_conflict()) {
      // Peer may connect avrcp during SDP. Check the connection state when
      // SDP completed to resolve the conflict.
      for (const auto& pair : instance_->device_map_) {
        if (bdaddr == pair.second->GetAddress()) {
          log::warn("Connected by peer device with address {}", bdaddr);
          if (features & BTA_AV_FEAT_ADV_CTRL) {
            pair.second->RegisterVolumeChanged();
          } else if (instance_->vol_ != nullptr) {
            instance_->vol_->DeviceConnected(pair.second->GetAddress());
          }
          return;
        }
      }
    }
    instance_->AvrcpConnect(true, bdaddr);
    return;
  };

  return SdpLookup(bdaddr, base::Bind(connection_lambda, this, bdaddr), false);
}

bool ConnectionHandler::DisconnectDevice(const RawAddress& bdaddr) {
  for (auto it = device_map_.begin(); it != device_map_.end(); it++) {
    if (bdaddr == it->second->GetAddress()) {
      uint8_t handle = it->first;
      return avrc_->Close(handle) == AVRC_SUCCESS;
    }
  }

  return false;
}

void ConnectionHandler::SetBipClientStatus(const RawAddress& bdaddr, bool connected) {
  for (auto it = device_map_.begin(); it != device_map_.end(); it++) {
    if (bdaddr == it->second->GetAddress()) {
      it->second->SetBipClientStatus(connected);
      return;
    }
  }
}

std::vector<std::shared_ptr<Device>> ConnectionHandler::GetListOfDevices() const {
  std::vector<std::shared_ptr<Device>> list;
  std::lock_guard<std::recursive_mutex> lock(device_map_lock);
  for (const auto& device : device_map_) {
    list.push_back(device.second);
  }
  return list;
}

bool ConnectionHandler::SdpLookup(const RawAddress& bdaddr, SdpCallback cb, bool retry) {
  log::info("");

  tAVRC_SDP_DB_PARAMS db_params;
  // TODO (apanicke): This needs to be replaced with smarter memory management.
  tSDP_DISCOVERY_DB* disc_db = (tSDP_DISCOVERY_DB*)osi_malloc(BT_DEFAULT_BUFFER_SIZE);
  uint16_t attr_list[] = {ATTR_ID_SERVICE_CLASS_ID_LIST, ATTR_ID_BT_PROFILE_DESC_LIST,
                          ATTR_ID_SUPPORTED_FEATURES};

  db_params.db_len = BT_DEFAULT_BUFFER_SIZE;  // Some magic number found in the AVRCP code
  db_params.num_attr = sizeof(attr_list) / sizeof(attr_list[0]);
  db_params.p_db = disc_db;
  db_params.p_attrs = attr_list;

  return avrc_->FindService(UUID_SERVCLASS_AV_REMOTE_CONTROL, bdaddr, &db_params,
                            base::Bind(&ConnectionHandler::SdpCb, weak_ptr_factory_.GetWeakPtr(),
                                       bdaddr, cb, disc_db, retry)) == AVRC_SUCCESS;
}

bool ConnectionHandler::AvrcpConnect(bool initiator, const RawAddress& bdaddr) {
  log::info("Connect to device {}", bdaddr);

  tAVRC_CONN_CB open_cb;
  if (initiator) {
    open_cb.ctrl_cback =
            base::Bind(&ConnectionHandler::InitiatorControlCb, weak_ptr_factory_.GetWeakPtr());
  } else {
    open_cb.ctrl_cback =
            base::Bind(&ConnectionHandler::AcceptorControlCb, weak_ptr_factory_.GetWeakPtr());
  }
  open_cb.msg_cback = base::Bind(&ConnectionHandler::MessageCb, weak_ptr_factory_.GetWeakPtr());
  open_cb.company_id = AVRC_CO_GOOGLE;
  open_cb.conn = initiator ? AVCT_ROLE_INITIATOR : AVCT_ROLE_ACCEPTOR;
  // TODO (apanicke): We shouldn't need RCCT to do absolute volume. The current
  // AVRC_API requires it though.
  open_cb.control = BTA_AV_FEAT_RCTG | BTA_AV_FEAT_RCCT | BTA_AV_FEAT_METADATA | AVRC_CT_PASSIVE;

  uint8_t handle = 0;
  uint16_t status = avrc_->Open(&handle, &open_cb, bdaddr);
  log::info("handle=0x{:x} status=0x{:x}", handle, status);
  return status == AVRC_SUCCESS;
}

void ConnectionHandler::InitiatorControlCb(uint8_t handle, uint8_t event, uint16_t result,
                                           const RawAddress* peer_addr) {
  DCHECK(!connection_cb_.is_null());

  log::info("handle=0x{:x} result=0x{:x} addr={}", handle, result,
            peer_addr ? peer_addr->ToRedactedStringForLogging() : "none");

  switch (event) {
    case AVRC_OPEN_IND_EVT: {
      log::info("Connection Opened Event");

      const auto& feature_iter = feature_map_.find(*peer_addr);
      if (feature_iter == feature_map_.end()) {
        log::error(
                "Features do not exist even though SDP should have been "
                "done first");
        return;
      }

      bool supports_browsing = feature_iter->second & BTA_AV_FEAT_BROWSE;

      if (supports_browsing) {
        avrc_->OpenBrowse(handle, AVCT_ROLE_INITIATOR);
      }

      // TODO (apanicke): Implement a system to cache SDP entries. For most
      // devices SDP is completed after the device connects AVRCP so that
      // information isn't very useful when trying to control our
      // capabilities. For now always use AVRCP 1.6.
      auto&& callback =
              base::BindRepeating(&ConnectionHandler::SendMessage, base::Unretained(this), handle);
      auto&& ctrl_mtu = avrc_->GetPeerMtu(handle) - AVCT_HDR_LEN;
      auto&& browse_mtu = avrc_->GetBrowseMtu(handle) - AVCT_HDR_LEN;
      std::shared_ptr<Device> newDevice = std::make_shared<Device>(*peer_addr, !supports_browsing,
                                                                   callback, ctrl_mtu, browse_mtu);

      device_map_[handle] = newDevice;
      // TODO (apanicke): Create the device with all of the interfaces it
      // needs. Return the new device where the service will register the
      // interfaces it needs.
      connection_cb_.Run(newDevice);

      if (!btif_av_src_sink_coexist_enabled() ||
          (btif_av_src_sink_coexist_enabled() &&
           btif_av_peer_is_connected_sink(newDevice->GetAddress()))) {
        if (feature_iter->second & BTA_AV_FEAT_ADV_CTRL) {
          newDevice->RegisterVolumeChanged();
        } else if (instance_->vol_ != nullptr) {
          instance_->vol_->DeviceConnected(newDevice->GetAddress());
        }
      }
    } break;

    case AVRC_CLOSE_IND_EVT: {
      log::info("Connection Closed Event");

      if (device_map_.find(handle) == device_map_.end()) {
        log::warn("Connection Close received from device that doesn't exist");
        return;
      }
      std::lock_guard<std::recursive_mutex> lock(device_map_lock);
      avrc_->Close(handle);
      feature_map_.erase(device_map_[handle]->GetAddress());
      device_map_[handle]->DeviceDisconnected();
      device_map_.erase(handle);
    } break;

    case AVRC_BROWSE_OPEN_IND_EVT: {
      log::info("Browse Open Event");
      // NOTE (apanicke): We don't need to explicitly handle this message
      // since the AVCTP Layer will still send us browsing messages
      // regardless. It would be useful to note this though for future
      // compatibility issues.
      if (device_map_.find(handle) == device_map_.end()) {
        log::warn("Browse Opened received from device that doesn't exist");
        return;
      }

      auto browse_mtu = avrc_->GetBrowseMtu(handle) - AVCT_HDR_LEN;
      device_map_[handle]->SetBrowseMtu(browse_mtu);
    } break;
    case AVRC_BROWSE_CLOSE_IND_EVT:
      log::info("Browse Close Event");
      break;
    default:
      log::error("Unknown AVRCP Control event");
      break;
  }
}

void ConnectionHandler::AcceptorControlCb(uint8_t handle, uint8_t event, uint16_t result,
                                          const RawAddress* peer_addr) {
  DCHECK(!connection_cb_.is_null());

  log::info("handle=0x{:x} result=0x{:x} addr={}", handle, result,
            peer_addr ? peer_addr->ToRedactedStringForLogging() : "none");

  switch (event) {
    case AVRC_OPEN_IND_EVT: {
      log::info("Connection Opened Event");
      if (peer_addr == NULL) {
        return;
      }
      if (btif_av_src_sink_coexist_enabled() && btif_av_peer_is_connected_source(*peer_addr)) {
        log::warn("peer is src, close new avrcp cback");
        if (device_map_.find(handle) != device_map_.end()) {
          std::lock_guard<std::recursive_mutex> lock(device_map_lock);
          feature_map_.erase(device_map_[handle]->GetAddress());
          device_map_[handle]->DeviceDisconnected();
          device_map_.erase(handle);
        }
        avrc_->Close(handle);
        AvrcpConnect(false, RawAddress::kAny);
        return;
      }
      auto&& callback = base::BindRepeating(&ConnectionHandler::SendMessage,
                                            weak_ptr_factory_.GetWeakPtr(), handle);
      auto&& ctrl_mtu = avrc_->GetPeerMtu(handle) - AVCT_HDR_LEN;
      auto&& browse_mtu = avrc_->GetBrowseMtu(handle) - AVCT_HDR_LEN;
      std::shared_ptr<Device> newDevice =
              std::make_shared<Device>(*peer_addr, false, callback, ctrl_mtu, browse_mtu);

      device_map_[handle] = newDevice;
      connection_cb_.Run(newDevice);

      log::info("Performing SDP on connected device. address={}", *peer_addr);
      auto sdp_lambda = [](ConnectionHandler* instance_, uint8_t handle, tSDP_STATUS /*status*/,
                           uint16_t /*version*/, uint16_t features) {
        if (instance_->device_map_.find(handle) == instance_->device_map_.end()) {
          log::warn("No device found for handle: 0x{:x}", handle);
          return;
        }

        auto device = instance_->device_map_[handle];
        instance_->feature_map_[device->GetAddress()] = features;

        // TODO (apanicke): Report to the VolumeInterface that a new Device is
        // connected that doesn't support absolute volume.
        if (!btif_av_src_sink_coexist_enabled() ||
            (btif_av_src_sink_coexist_enabled() &&
             btif_av_peer_is_connected_sink(device->GetAddress()))) {
          if (features & BTA_AV_FEAT_ADV_CTRL) {
            device->RegisterVolumeChanged();
          } else if (instance_->vol_ != nullptr) {
            instance_->vol_->DeviceConnected(device->GetAddress());
          }
        }
      };

      if (SdpLookup(*peer_addr, base::Bind(sdp_lambda, this, handle), false)) {
        avrc_->OpenBrowse(handle, AVCT_ROLE_ACCEPTOR);
      } else {
        // SDP search failed, this could be due to a collision between outgoing
        // and incoming connection. In any case, we need to reject the current
        // connection.
        log::error("SDP search failed for handle: 0x{:x}, closing connection", handle);
        DisconnectDevice(*peer_addr);
      }
      // Open for the next incoming connection. The handle will not be the same
      // as this one which will be closed when the device is disconnected.
      AvrcpConnect(false, RawAddress::kAny);

      // Check peer audio role: src or sink and connect A2DP after 3 seconds
      SdpLookupAudioRole(handle);
    } break;

    case AVRC_CLOSE_IND_EVT: {
      log::info("Connection Closed Event");

      if (device_map_.find(handle) == device_map_.end()) {
        log::warn("Connection Close received from device that doesn't exist");
        return;
      }
      {
        std::lock_guard<std::recursive_mutex> lock(device_map_lock);
        feature_map_.erase(device_map_[handle]->GetAddress());
        device_map_[handle]->DeviceDisconnected();
        device_map_.erase(handle);
      }
      avrc_->Close(handle);
    } break;

    case AVRC_BROWSE_OPEN_IND_EVT: {
      log::info("Browse Open Event");
      // NOTE (apanicke): We don't need to explicitly handle this message
      // since the AVCTP Layer will still send us browsing messages
      // regardless. It would be useful to note this though for future
      // compatibility issues.
      if (device_map_.find(handle) == device_map_.end()) {
        log::warn("Browse Opened received from device that doesn't exist");
        return;
      }

      auto browse_mtu = avrc_->GetBrowseMtu(handle) - AVCT_HDR_LEN;
      device_map_[handle]->SetBrowseMtu(browse_mtu);
    } break;
    case AVRC_BROWSE_CLOSE_IND_EVT:
      log::info("Browse Close Event");
      break;
    default:
      log::error("Unknown AVRCP Control event");
      break;
  }
}

void ConnectionHandler::MessageCb(uint8_t handle, uint8_t label, uint8_t opcode, tAVRC_MSG* p_msg) {
  if (device_map_.find(handle) == device_map_.end()) {
    log::error("Message received for unconnected device: handle=0x{:x}", handle);
    return;
  }

  auto pkt = AvrcpMessageConverter::Parse(p_msg);

  if (opcode == AVRC_OP_BROWSE) {
    if (btif_av_src_sink_coexist_enabled() && btif_av_both_enable()) {
      if (p_msg->browse.hdr.ctype == AVCT_RSP) {
        log::verbose("ignore response handle {}", (unsigned int)handle);
        return;
      }
    }
    log::verbose("Browse Message received on handle {}", (unsigned int)handle);
    device_map_[handle]->BrowseMessageReceived(label, BrowsePacket::Parse(pkt));
    return;
  }

  log::verbose("Message received on handle {}", (unsigned int)handle);
  device_map_[handle]->MessageReceived(label, Packet::Parse(pkt));
}

void ConnectionHandler::SdpCb(RawAddress bdaddr, SdpCallback cb, tSDP_DISCOVERY_DB* disc_db,
                              bool retry, tSDP_STATUS status) {
  log::verbose("SDP lookup callback received");

  if (status == tSDP_STATUS::SDP_CONN_FAILED && !retry) {
    log::warn("SDP Failure retry again");
    SdpLookup(bdaddr, cb, true);
    return;
  } else if (status != tSDP_STATUS::SDP_SUCCESS) {
    log::error("SDP Failure: status = {}", (unsigned int)status);
    cb.Run(status, 0, 0);
    osi_free(disc_db);
    return;
  }

  // Check the peer features
  tSDP_DISC_REC* sdp_record = nullptr;
  uint16_t peer_features = 0;
  uint16_t peer_avrcp_version = 0;

  // TODO (apanicke): Replace this in favor of our own supported features.
  sdp_record = sdp_->FindServiceInDb(disc_db, UUID_SERVCLASS_AV_REMOTE_CONTROL, nullptr);
  if (sdp_record != nullptr) {
    log::info("Device {} supports remote control", bdaddr);
    peer_features |= BTA_AV_FEAT_RCCT;

    if ((sdp_->FindAttributeInRec(sdp_record, ATTR_ID_BT_PROFILE_DESC_LIST)) != NULL) {
      /* get profile version (if failure, version parameter is not updated) */
      sdp_->FindProfileVersionInRec(sdp_record, UUID_SERVCLASS_AV_REMOTE_CONTROL,
                                    &peer_avrcp_version);
      log::verbose("Device {} peer avrcp version=0x{:x}", bdaddr, peer_avrcp_version);

      if (peer_avrcp_version >= AVRC_REV_1_3) {
        // These are the standard features, another way to check this is to
        // search for CAT1 on the remote device
        log::verbose("Device {} supports metadata", bdaddr);
        peer_features |= (BTA_AV_FEAT_VENDOR | BTA_AV_FEAT_METADATA);
      }
      if (peer_avrcp_version >= AVRC_REV_1_4) {
        /* get supported categories */
        log::verbose("Get Supported categories");
        tSDP_DISC_ATTR* sdp_attribute =
                sdp_->FindAttributeInRec(sdp_record, ATTR_ID_SUPPORTED_FEATURES);
        if (sdp_attribute != NULL &&
            SDP_DISC_ATTR_TYPE(sdp_attribute->attr_len_type) == UINT_DESC_TYPE &&
            SDP_DISC_ATTR_LEN(sdp_attribute->attr_len_type) >= 2) {
          log::verbose("Get Supported categories SDP ATTRIBUTES != null");
          uint16_t categories = sdp_attribute->attr_value.v.u16;
          if (categories & AVRC_SUPF_CT_CAT2) {
            log::verbose("Device {} supports advanced control", bdaddr);
            if (IsAbsoluteVolumeEnabled(&bdaddr)) {
              peer_features |= (BTA_AV_FEAT_ADV_CTRL);
            }
          }
          if (categories & AVRC_SUPF_CT_BROWSE) {
            log::verbose("Device {} supports browsing", bdaddr);
            peer_features |= (BTA_AV_FEAT_BROWSE);
          }
        }
      }

      if (osi_property_get_bool(AVRC_DYNAMIC_AVRCP_ENABLE_PROPERTY, true)) {
        avrc_->SaveControllerVersion(bdaddr, peer_avrcp_version);
      }
    }
  }

  sdp_record = sdp_->FindServiceInDb(disc_db, UUID_SERVCLASS_AV_REM_CTRL_TARGET, nullptr);
  if (sdp_record != nullptr) {
    log::verbose("Device {} supports remote control target", bdaddr);

    uint16_t peer_avrcp_target_version = 0;
    sdp_->FindProfileVersionInRec(sdp_record, UUID_SERVCLASS_AV_REMOTE_CONTROL,
                                  &peer_avrcp_target_version);
    log::verbose("Device {} peer avrcp target version=0x{:x}", bdaddr, peer_avrcp_target_version);

    if ((sdp_->FindAttributeInRec(sdp_record, ATTR_ID_BT_PROFILE_DESC_LIST)) != NULL) {
      if (peer_avrcp_target_version >= AVRC_REV_1_4) {
        /* get supported categories */
        log::verbose("Get Supported categories");
        tSDP_DISC_ATTR* sdp_attribute =
                sdp_->FindAttributeInRec(sdp_record, ATTR_ID_SUPPORTED_FEATURES);
        if (sdp_attribute != NULL &&
            SDP_DISC_ATTR_TYPE(sdp_attribute->attr_len_type) == UINT_DESC_TYPE &&
            SDP_DISC_ATTR_LEN(sdp_attribute->attr_len_type) >= 2) {
          log::verbose("Get Supported categories SDP ATTRIBUTES != null");
          uint16_t categories = sdp_attribute->attr_value.v.u16;
          if (categories & AVRC_SUPF_CT_CAT2) {
            log::verbose("Device {} supports advanced control", bdaddr);
            if (IsAbsoluteVolumeEnabled(&bdaddr)) {
              peer_features |= (BTA_AV_FEAT_ADV_CTRL);
            }
          }
        }
      }
    }
  }

  osi_free(disc_db);

  cb.Run(status, peer_avrcp_version, peer_features);
}

void ConnectionHandler::SendMessage(uint8_t handle, uint8_t label, bool browse,
                                    std::unique_ptr<::bluetooth::PacketBuilder> message) {
  std::shared_ptr<::bluetooth::Packet> packet = VectorPacket::Make();
  message->Serialize(packet);

  uint8_t ctype = AVRC_RSP_ACCEPT;
  if (!browse) {
    ctype = (uint8_t)(::bluetooth::Packet::Specialize<Packet>(packet)->GetCType());
  }

  log::info("SendMessage to handle=0x{:x}", handle);

  BT_HDR* pkt = (BT_HDR*)osi_malloc(BT_DEFAULT_BUFFER_SIZE);

  pkt->offset = AVCT_MSG_OFFSET;
  // TODO (apanicke): Update this constant. Currently this is a unique event
  // used to tell the AVRCP API layer that the data is properly formatted and
  // doesn't need to be processed. In the future, this is the only place sending
  // the packet so none of these layer specific fields will be used.
  pkt->event = 0xFFFF;
  /* Handle for AVRCP fragment */
  uint16_t op_code = (uint16_t)(::bluetooth::Packet::Specialize<Packet>(packet)->GetOpcode());
  if (!browse && (op_code == (uint16_t)(Opcode::VENDOR))) {
    pkt->event = op_code;
  }

  // TODO (apanicke): This layer specific stuff can go away once we move over
  // to the new service.
  pkt->layer_specific = AVCT_DATA_CTRL;
  if (browse) {
    pkt->layer_specific = AVCT_DATA_BROWSE;
  }

  pkt->len = packet->size();
  uint8_t* p_data = (uint8_t*)(pkt + 1) + pkt->offset;
  for (auto it = packet->begin(); it != packet->end(); it++) {
    *p_data++ = *it;
  }

  avrc_->MsgReq(handle, label, ctype, pkt);
}

void ConnectionHandler::RegisterVolChanged(const RawAddress& bdaddr) {
  log::info("Attempting to RegisterVolChanged device {}", bdaddr);
  for (auto it = device_map_.begin(); it != device_map_.end(); it++) {
    if (bdaddr == it->second->GetAddress()) {
      const auto& feature_iter = feature_map_.find(bdaddr);
      if (feature_iter->second & BTA_AV_FEAT_ADV_CTRL) {
        it->second->RegisterVolumeChanged();
      } else if (instance_->vol_ != nullptr) {
        instance_->vol_->DeviceConnected(bdaddr);
      }
      break;
    }
  }
}

bool ConnectionHandler::SdpLookupAudioRole(uint16_t handle) {
  if (device_map_.find(handle) == device_map_.end()) {
    log::warn("No device found for handle: 0x{:x}", handle);
    return false;
  }
  auto device = device_map_[handle];

  log::info(
          "Performing SDP for AUDIO_SINK on connected device: address={}, "
          "handle={}",
          device->GetAddress(), handle);

  return device->find_sink_service(base::Bind(&ConnectionHandler::SdpLookupAudioRoleCb,
                                              weak_ptr_factory_.GetWeakPtr(), handle));
}

void ConnectionHandler::SdpLookupAudioRoleCb(uint16_t handle, bool found,
                                             tA2DP_Service* /*p_service*/,
                                             const RawAddress& /*peer_address*/) {
  if (device_map_.find(handle) == device_map_.end()) {
    log::warn("No device found for handle: 0x{:x}", handle);
    return;
  }
  auto device = device_map_[handle];

  log::debug("SDP callback for address={}, handle={}, AUDIO_SINK {}", device->GetAddress(), handle,
             found ? "found" : "not found");

  if (found) {
    device->connect_a2dp_sink_delayed(handle);
  }
}

}  // namespace avrcp
}  // namespace bluetooth