text: /******************************************************************************
   *
   *  Copyright (c) 2014 The Android Open Source Project
   *  Copyright (C) 2009-2016 Broadcom Corporation
   *
   *  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.
   *
   ******************************************************************************/
  
  /*******************************************************************************
   *
   *  Filename:      btif_util.c
   *
   *  Description:   Miscellaneous helper functions
   *
   *
   ******************************************************************************/
  
  #define LOG_TAG "bt_btif_util"
  
  #include "btif_util.h"
  
  #include <base/logging.h>
  #include <ctype.h>
  #include <netinet/in.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  
  #include <hardware/bt_av.h>
  
  #include "avrc_defs.h"
  #include "bt_common.h"
  #include "bta_ag_api.h"
  #include "bta_api.h"
  #include "bta_av_api.h"
  #include "bta_hd_api.h"
  #include "bta_hf_client_api.h"
  #include "bta_hh_api.h"
  #include "bte.h"
  #include "btif_common.h"
  #include "btif_dm.h"
  #include "btu.h"
  
  /*******************************************************************************
   *  Constants & Macros
   ******************************************************************************/
  #define ISDIGIT(a) (((a) >= '0') && ((a) <= '9'))
  #define ISXDIGIT(a)                                                    \
    ((((a) >= '0') && ((a) <= '9')) || (((a) >= 'A') && ((a) <= 'F')) || \
     (((a) >= 'a') && ((a) <= 'f')))
  
  /*******************************************************************************
   *  Local type definitions
   ******************************************************************************/
  
  /*******************************************************************************
   *  Static variables
   ******************************************************************************/
  
  /*******************************************************************************
   *  Static functions
   ******************************************************************************/
  
  /*******************************************************************************
   *  Externs
   ******************************************************************************/
  
  /*******************************************************************************
   *  Functions
   ******************************************************************************/
  
  /*****************************************************************************
   *   Logging helper functions
   ****************************************************************************/
  
  uint32_t devclass2uint(DEV_CLASS dev_class) {
    uint32_t cod = 0;
  
    if (dev_class != NULL) {
      /* if COD is 0, irrespective of the device type set it to Unclassified
       * device */
      cod = (dev_class[2]) | (dev_class[1] << 8) | (dev_class[0] << 16);
    }
    return cod;
  }
  void uint2devclass(uint32_t cod, DEV_CLASS dev_class) {
    dev_class[2] = (uint8_t)cod;
    dev_class[1] = (uint8_t)(cod >> 8);
    dev_class[0] = (uint8_t)(cod >> 16);
  }
  
  static const uint8_t sdp_base_uuid[] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                                          0x10, 0x00, 0x80, 0x00, 0x00, 0x80,
                                          0x5F, 0x9B, 0x34, 0xFB};
  
  void uuid16_to_uuid128(uint16_t uuid16, bt_uuid_t* uuid128) {
    uint16_t uuid16_bo;
    memset(uuid128, 0, sizeof(bt_uuid_t));
  
    memcpy(uuid128->uu, sdp_base_uuid, MAX_UUID_SIZE);
    uuid16_bo = ntohs(uuid16);
    memcpy(uuid128->uu + 2, &uuid16_bo, sizeof(uint16_t));
  }
  
  bool string_to_uuid(const char* str, bt_uuid_t* p_uuid) {
    CHECK(p_uuid);
    if (str == NULL) return false;
  
    uint32_t uuid0, uuid4;
    uint16_t uuid1, uuid2, uuid3, uuid5;
  
    int rc = sscanf(str, "%08x-%04hx-%04hx-%04hx-%08x%04hx", &uuid0, &uuid1,
                    &uuid2, &uuid3, &uuid4, &uuid5);
    if (rc != 6) return false;
  
    uuid0 = htonl(uuid0);
    uuid1 = htons(uuid1);
    uuid2 = htons(uuid2);
    uuid3 = htons(uuid3);
    uuid4 = htonl(uuid4);
    uuid5 = htons(uuid5);
  
    memcpy(&(p_uuid->uu[0]), &uuid0, 4);
    memcpy(&(p_uuid->uu[4]), &uuid1, 2);
    memcpy(&(p_uuid->uu[6]), &uuid2, 2);
    memcpy(&(p_uuid->uu[8]), &uuid3, 2);
    memcpy(&(p_uuid->uu[10]), &uuid4, 4);
    memcpy(&(p_uuid->uu[14]), &uuid5, 2);
  
    return true;
  }
  
  void uuid_to_string_legacy(bt_uuid_t* p_uuid, char* str, size_t str_len) {
    uint32_t uuid0, uuid4;
    uint16_t uuid1, uuid2, uuid3, uuid5;
  
    memcpy(&uuid0, &(p_uuid->uu[0]), 4);
    memcpy(&uuid1, &(p_uuid->uu[4]), 2);
    memcpy(&uuid2, &(p_uuid->uu[6]), 2);
    memcpy(&uuid3, &(p_uuid->uu[8]), 2);
    memcpy(&uuid4, &(p_uuid->uu[10]), 4);
    memcpy(&uuid5, &(p_uuid->uu[14]), 2);
  
    snprintf(str, str_len, "%.8x-%.4x-%.4x-%.4x-%.8x%.4x", ntohl(uuid0),
             ntohs(uuid1), ntohs(uuid2), ntohs(uuid3), ntohl(uuid4),
             ntohs(uuid5));
    return;
  }
  
  /*****************************************************************************
   *  Function        ascii_2_hex
   *
   *  Description     This function converts an ASCII string into HEX
   *
   *  Returns         the number of hex bytes filled.
  */
  int ascii_2_hex(const char* p_ascii, int len, uint8_t* p_hex) {
    int x;
    uint8_t c;
  
    for (x = 0; (x < len) && (*p_ascii); x++) {
      if (ISDIGIT(*p_ascii))
        c = (*p_ascii - '0') << 4;
      else
        c = (toupper(*p_ascii) - 'A' + 10) << 4;
  
      p_ascii++;
      if (*p_ascii) {
        if (ISDIGIT(*p_ascii))
          c |= (*p_ascii - '0');
        else
          c |= (toupper(*p_ascii) - 'A' + 10);
  
        p_ascii++;
      }
      *p_hex++ = c;
    }
  
    return (x);
  }
  
  const char* dump_dm_search_event(uint16_t event) {
    switch (event) {
      CASE_RETURN_STR(BTA_DM_INQ_RES_EVT)
      CASE_RETURN_STR(BTA_DM_INQ_CMPL_EVT)
      CASE_RETURN_STR(BTA_DM_DISC_RES_EVT)
      CASE_RETURN_STR(BTA_DM_DISC_BLE_RES_EVT)
      CASE_RETURN_STR(BTA_DM_DISC_CMPL_EVT)
      CASE_RETURN_STR(BTA_DM_DI_DISC_CMPL_EVT)
      CASE_RETURN_STR(BTA_DM_SEARCH_CANCEL_CMPL_EVT)
  
      default:
        return "UNKNOWN MSG ID";
    }
  }
  
  const char* dump_property_type(bt_property_type_t type) {
    switch (type) {
      CASE_RETURN_STR(BT_PROPERTY_BDNAME)
      CASE_RETURN_STR(BT_PROPERTY_BDADDR)
      CASE_RETURN_STR(BT_PROPERTY_UUIDS)
      CASE_RETURN_STR(BT_PROPERTY_CLASS_OF_DEVICE)
      CASE_RETURN_STR(BT_PROPERTY_TYPE_OF_DEVICE)
      CASE_RETURN_STR(BT_PROPERTY_REMOTE_RSSI)
      CASE_RETURN_STR(BT_PROPERTY_ADAPTER_DISCOVERY_TIMEOUT)
      CASE_RETURN_STR(BT_PROPERTY_ADAPTER_BONDED_DEVICES)
      CASE_RETURN_STR(BT_PROPERTY_ADAPTER_SCAN_MODE)
      CASE_RETURN_STR(BT_PROPERTY_REMOTE_FRIENDLY_NAME)
  
      default:
        return "UNKNOWN PROPERTY ID";
    }
  }
  
  const char* dump_dm_event(uint16_t event) {
    switch (event) {
      CASE_RETURN_STR(BTA_DM_ENABLE_EVT)
      CASE_RETURN_STR(BTA_DM_DISABLE_EVT)
      CASE_RETURN_STR(BTA_DM_PIN_REQ_EVT)
      CASE_RETURN_STR(BTA_DM_AUTH_CMPL_EVT)
      CASE_RETURN_STR(BTA_DM_AUTHORIZE_EVT)
      CASE_RETURN_STR(BTA_DM_LINK_UP_EVT)
      CASE_RETURN_STR(BTA_DM_LINK_DOWN_EVT)
      CASE_RETURN_STR(BTA_DM_SIG_STRENGTH_EVT)
      CASE_RETURN_STR(BTA_DM_BUSY_LEVEL_EVT)
      CASE_RETURN_STR(BTA_DM_BOND_CANCEL_CMPL_EVT)
      CASE_RETURN_STR(BTA_DM_SP_CFM_REQ_EVT)
      CASE_RETURN_STR(BTA_DM_SP_KEY_NOTIF_EVT)
      CASE_RETURN_STR(BTA_DM_SP_RMT_OOB_EVT)
      CASE_RETURN_STR(BTA_DM_SP_KEYPRESS_EVT)
      CASE_RETURN_STR(BTA_DM_ROLE_CHG_EVT)
      CASE_RETURN_STR(BTA_DM_BLE_KEY_EVT)
      CASE_RETURN_STR(BTA_DM_BLE_SEC_REQ_EVT)
      CASE_RETURN_STR(BTA_DM_BLE_PASSKEY_NOTIF_EVT)
      CASE_RETURN_STR(BTA_DM_BLE_PASSKEY_REQ_EVT)
      CASE_RETURN_STR(BTA_DM_BLE_OOB_REQ_EVT)
      CASE_RETURN_STR(BTA_DM_BLE_LOCAL_IR_EVT)
      CASE_RETURN_STR(BTA_DM_BLE_LOCAL_ER_EVT)
      CASE_RETURN_STR(BTA_DM_BLE_AUTH_CMPL_EVT)
      CASE_RETURN_STR(BTA_DM_DEV_UNPAIRED_EVT)
      CASE_RETURN_STR(BTA_DM_HW_ERROR_EVT)
      CASE_RETURN_STR(BTA_DM_ENER_INFO_READ)
  
      default:
        return "UNKNOWN DM EVENT";
    }
  }
  
  const char* dump_hf_event(uint16_t event) {
    switch (event) {
      CASE_RETURN_STR(BTA_AG_ENABLE_EVT)
      CASE_RETURN_STR(BTA_AG_REGISTER_EVT)
      CASE_RETURN_STR(BTA_AG_OPEN_EVT)
      CASE_RETURN_STR(BTA_AG_CLOSE_EVT)
      CASE_RETURN_STR(BTA_AG_CONN_EVT)
      CASE_RETURN_STR(BTA_AG_AUDIO_OPEN_EVT)
      CASE_RETURN_STR(BTA_AG_AUDIO_CLOSE_EVT)
      CASE_RETURN_STR(BTA_AG_SPK_EVT)
      CASE_RETURN_STR(BTA_AG_MIC_EVT)
      CASE_RETURN_STR(BTA_AG_AT_CKPD_EVT)
      CASE_RETURN_STR(BTA_AG_DISABLE_EVT)
      CASE_RETURN_STR(BTA_AG_WBS_EVT)
      CASE_RETURN_STR(BTA_AG_AT_A_EVT)
      CASE_RETURN_STR(BTA_AG_AT_D_EVT)
      CASE_RETURN_STR(BTA_AG_AT_CHLD_EVT)
      CASE_RETURN_STR(BTA_AG_AT_CHUP_EVT)
      CASE_RETURN_STR(BTA_AG_AT_CIND_EVT)
      CASE_RETURN_STR(BTA_AG_AT_VTS_EVT)
      CASE_RETURN_STR(BTA_AG_AT_BINP_EVT)
      CASE_RETURN_STR(BTA_AG_AT_BLDN_EVT)
      CASE_RETURN_STR(BTA_AG_AT_BVRA_EVT)
      CASE_RETURN_STR(BTA_AG_AT_NREC_EVT)
      CASE_RETURN_STR(BTA_AG_AT_CNUM_EVT)
      CASE_RETURN_STR(BTA_AG_AT_BTRH_EVT)
      CASE_RETURN_STR(BTA_AG_AT_CLCC_EVT)
      CASE_RETURN_STR(BTA_AG_AT_COPS_EVT)
      CASE_RETURN_STR(BTA_AG_AT_UNAT_EVT)
      CASE_RETURN_STR(BTA_AG_AT_CBC_EVT)
      CASE_RETURN_STR(BTA_AG_AT_BAC_EVT)
      CASE_RETURN_STR(BTA_AG_AT_BCS_EVT)
      CASE_RETURN_STR(BTA_AG_AT_BIND_EVT)
      CASE_RETURN_STR(BTA_AG_AT_BIEV_EVT)
  
      default:
        return "UNKNOWN MSG ID";
    }
  }
  
  const char* dump_hf_client_event(uint16_t event) {
    switch (event) {
      CASE_RETURN_STR(BTA_HF_CLIENT_ENABLE_EVT)
      CASE_RETURN_STR(BTA_HF_CLIENT_REGISTER_EVT)
      CASE_RETURN_STR(BTA_HF_CLIENT_OPEN_EVT)
      CASE_RETURN_STR(BTA_HF_CLIENT_CLOSE_EVT)
      CASE_RETURN_STR(BTA_HF_CLIENT_CONN_EVT)
      CASE_RETURN_STR(BTA_HF_CLIENT_AUDIO_OPEN_EVT)
      CASE_RETURN_STR(BTA_HF_CLIENT_AUDIO_MSBC_OPEN_EVT)
      CASE_RETURN_STR(BTA_HF_CLIENT_AUDIO_CLOSE_EVT)
      CASE_RETURN_STR(BTA_HF_CLIENT_SPK_EVT)
      CASE_RETURN_STR(BTA_HF_CLIENT_MIC_EVT)
      CASE_RETURN_STR(BTA_HF_CLIENT_DISABLE_EVT)
      CASE_RETURN_STR(BTA_HF_CLIENT_IND_EVT)
      CASE_RETURN_STR(BTA_HF_CLIENT_VOICE_REC_EVT)
      CASE_RETURN_STR(BTA_HF_CLIENT_OPERATOR_NAME_EVT)
      CASE_RETURN_STR(BTA_HF_CLIENT_CLIP_EVT)
      CASE_RETURN_STR(BTA_HF_CLIENT_CCWA_EVT)
      CASE_RETURN_STR(BTA_HF_CLIENT_AT_RESULT_EVT)
      CASE_RETURN_STR(BTA_HF_CLIENT_CLCC_EVT)
      CASE_RETURN_STR(BTA_HF_CLIENT_CNUM_EVT)
      CASE_RETURN_STR(BTA_HF_CLIENT_BTRH_EVT)
      CASE_RETURN_STR(BTA_HF_CLIENT_BSIR_EVT)
      CASE_RETURN_STR(BTA_HF_CLIENT_BINP_EVT)
      CASE_RETURN_STR(BTA_HF_CLIENT_RING_INDICATION)
      default:
        return "UNKNOWN MSG ID";
    }
  }
  
  const char* dump_hh_event(uint16_t event) {
    switch (event) {
      CASE_RETURN_STR(BTA_HH_ENABLE_EVT)
      CASE_RETURN_STR(BTA_HH_DISABLE_EVT)
      CASE_RETURN_STR(BTA_HH_OPEN_EVT)
      CASE_RETURN_STR(BTA_HH_CLOSE_EVT)
      CASE_RETURN_STR(BTA_HH_GET_DSCP_EVT)
      CASE_RETURN_STR(BTA_HH_GET_PROTO_EVT)
      CASE_RETURN_STR(BTA_HH_GET_RPT_EVT)
      CASE_RETURN_STR(BTA_HH_GET_IDLE_EVT)
      CASE_RETURN_STR(BTA_HH_SET_PROTO_EVT)
      CASE_RETURN_STR(BTA_HH_SET_RPT_EVT)
      CASE_RETURN_STR(BTA_HH_SET_IDLE_EVT)
      CASE_RETURN_STR(BTA_HH_VC_UNPLUG_EVT)
      CASE_RETURN_STR(BTA_HH_ADD_DEV_EVT)
      CASE_RETURN_STR(BTA_HH_RMV_DEV_EVT)
      CASE_RETURN_STR(BTA_HH_API_ERR_EVT)
      default:
        return "UNKNOWN MSG ID";
    }
  }
  
  const char* dump_hf_conn_state(uint16_t event) {
    switch (event) {
      CASE_RETURN_STR(BTHF_CONNECTION_STATE_DISCONNECTED)
      CASE_RETURN_STR(BTHF_CONNECTION_STATE_CONNECTING)
      CASE_RETURN_STR(BTHF_CONNECTION_STATE_CONNECTED)
      CASE_RETURN_STR(BTHF_CONNECTION_STATE_SLC_CONNECTED)
      CASE_RETURN_STR(BTHF_CONNECTION_STATE_DISCONNECTING)
      default:
        return "UNKNOWN MSG ID";
    }
  }
  
  const char* dump_hd_event(uint16_t event) {
    switch (event) {
      CASE_RETURN_STR(BTA_HD_ENABLE_EVT)
      CASE_RETURN_STR(BTA_HD_DISABLE_EVT)
      CASE_RETURN_STR(BTA_HD_REGISTER_APP_EVT)
      CASE_RETURN_STR(BTA_HD_UNREGISTER_APP_EVT)
      CASE_RETURN_STR(BTA_HD_OPEN_EVT)
      CASE_RETURN_STR(BTA_HD_CLOSE_EVT)
      CASE_RETURN_STR(BTA_HD_GET_REPORT_EVT)
      CASE_RETURN_STR(BTA_HD_SET_REPORT_EVT)
      CASE_RETURN_STR(BTA_HD_SET_PROTOCOL_EVT)
      CASE_RETURN_STR(BTA_HD_INTR_DATA_EVT)
      CASE_RETURN_STR(BTA_HD_VC_UNPLUG_EVT)
      CASE_RETURN_STR(BTA_HD_CONN_STATE_EVT)
      CASE_RETURN_STR(BTA_HD_API_ERR_EVT)
      default:
        return "UNKNOWN MSG ID";
    }
  }
  
  const char* dump_hf_call_state(bthf_call_state_t call_state) {
    switch (call_state) {
      CASE_RETURN_STR(BTHF_CALL_STATE_IDLE)
      CASE_RETURN_STR(BTHF_CALL_STATE_HELD)
      CASE_RETURN_STR(BTHF_CALL_STATE_DIALING)
      CASE_RETURN_STR(BTHF_CALL_STATE_ALERTING)
      CASE_RETURN_STR(BTHF_CALL_STATE_INCOMING)
      CASE_RETURN_STR(BTHF_CALL_STATE_WAITING)
      CASE_RETURN_STR(BTHF_CALL_STATE_ACTIVE)
      default:
        return "UNKNOWN CALL STATE";
    }
  }
  
  const char* dump_thread_evt(bt_cb_thread_evt evt) {
    switch (evt) {
      CASE_RETURN_STR(ASSOCIATE_JVM)
      CASE_RETURN_STR(DISASSOCIATE_JVM)
  
      default:
        return "unknown thread evt";
    }
  }
  
  const char* dump_hf_audio_state(uint16_t event) {
    switch (event) {
      CASE_RETURN_STR(BTHF_AUDIO_STATE_DISCONNECTED)
      CASE_RETURN_STR(BTHF_AUDIO_STATE_CONNECTING)
      CASE_RETURN_STR(BTHF_AUDIO_STATE_CONNECTED)
      CASE_RETURN_STR(BTHF_AUDIO_STATE_DISCONNECTING)
      default:
        return "UNKNOWN MSG ID";
    }
  }
  
  const char* dump_av_conn_state(uint16_t event) {
    switch (event) {
      CASE_RETURN_STR(BTAV_CONNECTION_STATE_DISCONNECTED)
      CASE_RETURN_STR(BTAV_CONNECTION_STATE_CONNECTING)
      CASE_RETURN_STR(BTAV_CONNECTION_STATE_CONNECTED)
      CASE_RETURN_STR(BTAV_CONNECTION_STATE_DISCONNECTING)
      default:
        return "UNKNOWN MSG ID";
    }
  }
  
  const char* dump_av_audio_state(uint16_t event) {
    switch (event) {
      CASE_RETURN_STR(BTAV_AUDIO_STATE_REMOTE_SUSPEND)
      CASE_RETURN_STR(BTAV_AUDIO_STATE_STOPPED)
      CASE_RETURN_STR(BTAV_AUDIO_STATE_STARTED)
      default:
        return "UNKNOWN MSG ID";
    }
  }
  
  const char* dump_adapter_scan_mode(bt_scan_mode_t mode) {
    switch (mode) {
      CASE_RETURN_STR(BT_SCAN_MODE_NONE)
      CASE_RETURN_STR(BT_SCAN_MODE_CONNECTABLE)
      CASE_RETURN_STR(BT_SCAN_MODE_CONNECTABLE_DISCOVERABLE)
  
      default:
        return "unknown scan mode";
    }
  }
  
  const char* dump_bt_status(bt_status_t status) {
    switch (status) {
      CASE_RETURN_STR(BT_STATUS_SUCCESS)
      CASE_RETURN_STR(BT_STATUS_FAIL)
      CASE_RETURN_STR(BT_STATUS_NOT_READY)
      CASE_RETURN_STR(BT_STATUS_NOMEM)
      CASE_RETURN_STR(BT_STATUS_BUSY)
      CASE_RETURN_STR(BT_STATUS_UNSUPPORTED)
  
      default:
        return "unknown scan mode";
    }
  }
  
  const char* dump_rc_event(uint8_t event) {
    switch (event) {
      CASE_RETURN_STR(BTA_AV_RC_OPEN_EVT)
      CASE_RETURN_STR(BTA_AV_RC_CLOSE_EVT)
      CASE_RETURN_STR(BTA_AV_RC_BROWSE_OPEN_EVT)
      CASE_RETURN_STR(BTA_AV_RC_BROWSE_CLOSE_EVT)
      CASE_RETURN_STR(BTA_AV_REMOTE_CMD_EVT)
      CASE_RETURN_STR(BTA_AV_REMOTE_RSP_EVT)
      CASE_RETURN_STR(BTA_AV_VENDOR_CMD_EVT)
      CASE_RETURN_STR(BTA_AV_VENDOR_RSP_EVT)
      CASE_RETURN_STR(BTA_AV_META_MSG_EVT)
      CASE_RETURN_STR(BTA_AV_RC_FEAT_EVT)
      default:
        return "UNKNOWN_EVENT";
    }
  }
  
  const char* dump_rc_notification_event_id(uint8_t event_id) {
    switch (event_id) {
      CASE_RETURN_STR(AVRC_EVT_PLAY_STATUS_CHANGE)
      CASE_RETURN_STR(AVRC_EVT_TRACK_CHANGE)
      CASE_RETURN_STR(AVRC_EVT_TRACK_REACHED_END)
      CASE_RETURN_STR(AVRC_EVT_TRACK_REACHED_START)
      CASE_RETURN_STR(AVRC_EVT_PLAY_POS_CHANGED)
      CASE_RETURN_STR(AVRC_EVT_BATTERY_STATUS_CHANGE)
      CASE_RETURN_STR(AVRC_EVT_SYSTEM_STATUS_CHANGE)
      CASE_RETURN_STR(AVRC_EVT_APP_SETTING_CHANGE)
      CASE_RETURN_STR(AVRC_EVT_VOLUME_CHANGE)
      CASE_RETURN_STR(AVRC_EVT_ADDR_PLAYER_CHANGE)
      CASE_RETURN_STR(AVRC_EVT_AVAL_PLAYERS_CHANGE)
      CASE_RETURN_STR(AVRC_EVT_NOW_PLAYING_CHANGE)
      CASE_RETURN_STR(AVRC_EVT_UIDS_CHANGE)
  
      default:
        return "Unhandled Event ID";
    }
  }
  
  const char* dump_rc_pdu(uint8_t pdu) {
    switch (pdu) {
      CASE_RETURN_STR(AVRC_PDU_LIST_PLAYER_APP_ATTR)
      CASE_RETURN_STR(AVRC_PDU_LIST_PLAYER_APP_VALUES)
      CASE_RETURN_STR(AVRC_PDU_GET_CUR_PLAYER_APP_VALUE)
      CASE_RETURN_STR(AVRC_PDU_SET_PLAYER_APP_VALUE)
      CASE_RETURN_STR(AVRC_PDU_GET_PLAYER_APP_ATTR_TEXT)
      CASE_RETURN_STR(AVRC_PDU_GET_PLAYER_APP_VALUE_TEXT)
      CASE_RETURN_STR(AVRC_PDU_INFORM_DISPLAY_CHARSET)
      CASE_RETURN_STR(AVRC_PDU_INFORM_BATTERY_STAT_OF_CT)
      CASE_RETURN_STR(AVRC_PDU_GET_ELEMENT_ATTR)
      CASE_RETURN_STR(AVRC_PDU_GET_PLAY_STATUS)
      CASE_RETURN_STR(AVRC_PDU_REGISTER_NOTIFICATION)
      CASE_RETURN_STR(AVRC_PDU_REQUEST_CONTINUATION_RSP)
      CASE_RETURN_STR(AVRC_PDU_ABORT_CONTINUATION_RSP)
      CASE_RETURN_STR(AVRC_PDU_SET_ABSOLUTE_VOLUME)
      CASE_RETURN_STR(AVRC_PDU_SET_ADDRESSED_PLAYER)
      CASE_RETURN_STR(AVRC_PDU_CHANGE_PATH)
      CASE_RETURN_STR(AVRC_PDU_GET_CAPABILITIES)
      CASE_RETURN_STR(AVRC_PDU_SET_BROWSED_PLAYER)
      CASE_RETURN_STR(AVRC_PDU_GET_FOLDER_ITEMS)
      CASE_RETURN_STR(AVRC_PDU_GET_ITEM_ATTRIBUTES)
      CASE_RETURN_STR(AVRC_PDU_PLAY_ITEM)
      CASE_RETURN_STR(AVRC_PDU_SEARCH)
      CASE_RETURN_STR(AVRC_PDU_ADD_TO_NOW_PLAYING)
      CASE_RETURN_STR(AVRC_PDU_GET_TOTAL_NUM_OF_ITEMS)
      CASE_RETURN_STR(AVRC_PDU_GENERAL_REJECT)
  
      default:
        return "Unknown PDU";
    }
  }
  