system/stack/avrc/avrc_bld_ct.cc

/******************************************************************************
 *
 *  Copyright 2006-2013 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.
 *
 ******************************************************************************/

#define LOG_TAG "avrcp"

#include <string.h>

#include "avrc_api.h"
#include "avrc_defs.h"
#include "avrc_int.h"
#include "internal_include/bt_target.h"
#include "os/log.h"
#include "osi/include/allocator.h"
#include "stack/include/bt_hdr.h"
#include "stack/include/bt_types.h"

/*****************************************************************************
 *  Global data
 ****************************************************************************/

/*******************************************************************************
 *
 * Function         avrc_bld_next_cmd
 *
 * Description      This function builds the Request Continue or Abort command.
 *
 * Returns          AVRC_STS_NO_ERROR, if the command is built successfully
 *                  Otherwise, the error code.
 *
 ******************************************************************************/
static tAVRC_STS avrc_bld_next_cmd(tAVRC_NEXT_CMD* p_cmd, BT_HDR* p_pkt) {
  uint8_t *p_data, *p_start;

  LOG_VERBOSE("avrc_bld_next_cmd");

  /* get the existing length, if any, and also the num attributes */
  p_start = (uint8_t*)(p_pkt + 1) + p_pkt->offset;
  p_data = p_start + 2; /* pdu + rsvd */

  /* add fixed lenth 1 - pdu_id (1) */
  UINT16_TO_BE_STREAM(p_data, 1);
  UINT8_TO_BE_STREAM(p_data, p_cmd->target_pdu);
  p_pkt->len = (p_data - p_start);

  return AVRC_STS_NO_ERROR;
}

/*****************************************************************************
 *  the following commands are introduced in AVRCP 1.4
 ****************************************************************************/

/*******************************************************************************
 *
 * Function         avrc_bld_set_abs_volume_cmd
 *
 * Description      This function builds the Set Absolute Volume command.
 *
 * Returns          AVRC_STS_NO_ERROR, if the command is built successfully
 *                  Otherwise, the error code.
 *
 ******************************************************************************/
static tAVRC_STS avrc_bld_set_abs_volume_cmd(tAVRC_SET_VOLUME_CMD* p_cmd,
                                             BT_HDR* p_pkt) {
  uint8_t *p_data, *p_start;

  LOG_VERBOSE("avrc_bld_set_abs_volume_cmd");
  /* get the existing length, if any, and also the num attributes */
  p_start = (uint8_t*)(p_pkt + 1) + p_pkt->offset;
  p_data = p_start + 2; /* pdu + rsvd */
  /* add fixed lenth 1 - volume (1) */
  UINT16_TO_BE_STREAM(p_data, 1);
  UINT8_TO_BE_STREAM(p_data, (AVRC_MAX_VOLUME & p_cmd->volume));
  p_pkt->len = (p_data - p_start);
  return AVRC_STS_NO_ERROR;
}

/*******************************************************************************
 *
 * Function         avrc_bld_register_notifn
 *
 * Description      This function builds the register notification.
 *
 * Returns          AVRC_STS_NO_ERROR, if the command is built successfully
 *                  Otherwise, the error code.
 *
 ******************************************************************************/
static tAVRC_STS avrc_bld_register_notifn(BT_HDR* p_pkt, uint8_t event_id,
                                          uint32_t event_param) {
  uint8_t *p_data, *p_start;

  LOG_VERBOSE("avrc_bld_register_notifn");
  /* get the existing length, if any, and also the num attributes */
  // Set the notify value
  p_start = (uint8_t*)(p_pkt + 1) + p_pkt->offset;
  p_data = p_start + 2; /* pdu + rsvd */
  /* add fixed length 5 -*/
  UINT16_TO_BE_STREAM(p_data, 5);
  UINT8_TO_BE_STREAM(p_data, event_id);
  UINT32_TO_BE_STREAM(p_data, event_param);
  p_pkt->len = (p_data - p_start);
  return AVRC_STS_NO_ERROR;
}

/*******************************************************************************
 *
 * Function         avrc_bld_get_capability_cmd
 *
 * Description      This function builds the get capability command.
 *
 * Returns          AVRC_STS_NO_ERROR, if the command is built successfully
 *                  Otherwise, the error code.
 *
 ******************************************************************************/
static tAVRC_STS avrc_bld_get_capability_cmd(BT_HDR* p_pkt, uint8_t cap_id) {
  LOG_VERBOSE("avrc_bld_get_capability_cmd");
  uint8_t* p_start = (uint8_t*)(p_pkt + 1) + p_pkt->offset;
  uint8_t* p_data = p_start + 2; /* pdu + rsvd */
  /* add fixed length 1 -*/
  UINT16_TO_BE_STREAM(p_data, 1);
  UINT8_TO_BE_STREAM(p_data, cap_id);
  p_pkt->len = (p_data - p_start);
  return AVRC_STS_NO_ERROR;
}

/*******************************************************************************
 *
 * Function         avrc_bld_list_player_app_attr_cmd
 *
 * Description      This function builds the list player app attrib command.
 *
 * Returns          AVRC_STS_NO_ERROR, if the command is built successfully
 *                  Otherwise, the error code.
 *
 ******************************************************************************/
static tAVRC_STS avrc_bld_list_player_app_attr_cmd(BT_HDR* p_pkt) {
  LOG_VERBOSE("avrc_bld_list_player_app_attr_cmd");
  uint8_t* p_start = (uint8_t*)(p_pkt + 1) + p_pkt->offset;
  uint8_t* p_data = p_start + 2; /* pdu + rsvd */
  /* add fixed length 1 -*/
  UINT16_TO_BE_STREAM(p_data, 0);
  p_pkt->len = (p_data - p_start);
  return AVRC_STS_NO_ERROR;
}

/*******************************************************************************
 *
 * Function         avrc_bld_list_player_app_values_cmd
 *
 * Description      This function builds the list player app values command.
 *
 * Returns          AVRC_STS_NO_ERROR, if the command is built successfully
 *                  Otherwise, the error code.
 *
 ******************************************************************************/
static tAVRC_STS avrc_bld_list_player_app_values_cmd(BT_HDR* p_pkt,
                                                     uint8_t attrib_id) {
  LOG_VERBOSE("avrc_bld_list_player_app_values_cmd");
  uint8_t* p_start = (uint8_t*)(p_pkt + 1) + p_pkt->offset;
  uint8_t* p_data = p_start + 2; /* pdu + rsvd */
  /* add fixed length 1 -*/
  UINT16_TO_BE_STREAM(p_data, 1);
  UINT8_TO_BE_STREAM(p_data, attrib_id);
  p_pkt->len = (p_data - p_start);
  return AVRC_STS_NO_ERROR;
}

/*******************************************************************************
 *
 * Function         avrc_bld_get_current_player_app_values_cmd
 *
 * Description      This function builds the get current player app setting
 *                  values command.
 *
 * Returns          AVRC_STS_NO_ERROR, if the command is built successfully
 *                  Otherwise, the error code.
 *
 ******************************************************************************/
static tAVRC_STS avrc_bld_get_current_player_app_values_cmd(
    BT_HDR* p_pkt, uint8_t num_attrib_id, uint8_t* attrib_ids) {
  LOG_VERBOSE("avrc_bld_get_current_player_app_values_cmd");
  uint8_t* p_start = (uint8_t*)(p_pkt + 1) + p_pkt->offset;
  uint8_t* p_data = p_start + 2; /* pdu + rsvd */
  uint8_t param_len =
      num_attrib_id + 1;  // 1 additional to hold num attributes feild
  /* add length -*/
  UINT16_TO_BE_STREAM(p_data, param_len);
  UINT8_TO_BE_STREAM(p_data, num_attrib_id);
  for (int count = 0; count < num_attrib_id; count++) {
    UINT8_TO_BE_STREAM(p_data, attrib_ids[count]);
  }
  p_pkt->len = (p_data - p_start);
  return AVRC_STS_NO_ERROR;
}

/*******************************************************************************
 *
 * Function         avrc_bld_set_current_player_app_values_cmd
 *
 * Description      This function builds the set current player app setting
 *                  values command.
 *
 * Returns          AVRC_STS_NO_ERROR, if the command is built successfully
 *                  Otherwise, the error code.
 *
 ******************************************************************************/
static tAVRC_STS avrc_bld_set_current_player_app_values_cmd(
    BT_HDR* p_pkt, uint8_t num_attrib_id, tAVRC_APP_SETTING* p_val) {
  LOG_VERBOSE("avrc_bld_set_current_player_app_values_cmd");
  uint8_t* p_start = (uint8_t*)(p_pkt + 1) + p_pkt->offset;
  uint8_t* p_data = p_start + 2; /* pdu + rsvd */
  /* we have to store attrib- value pair
   * 1 additional to store num elements
   */
  uint8_t param_len = (2 * num_attrib_id) + 1;
  /* add length */
  UINT16_TO_BE_STREAM(p_data, param_len);
  UINT8_TO_BE_STREAM(p_data, num_attrib_id);
  for (int count = 0; count < num_attrib_id; count++) {
    UINT8_TO_BE_STREAM(p_data, p_val[count].attr_id);
    UINT8_TO_BE_STREAM(p_data, p_val[count].attr_val);
  }
  p_pkt->len = (p_data - p_start);
  return AVRC_STS_NO_ERROR;
}

/*******************************************************************************
 *
 * Function         avrc_bld_get_player_app_setting_attr_text_cmd
 *
 * Description      This function builds the get player app setting attribute
 *                  text command.
 *
 * Returns          AVRC_STS_NO_ERROR, if the command is built successfully
 *                  Otherwise, the error code.
 *
 ******************************************************************************/
static tAVRC_STS avrc_bld_get_player_app_setting_attr_text_cmd(
    BT_HDR* p_pkt, tAVRC_GET_APP_ATTR_TXT_CMD* p_cmd) {
  LOG_VERBOSE("%s", __func__);

  uint8_t* p_start = (uint8_t*)(p_pkt + 1) + p_pkt->offset;
  uint8_t* p_data = p_start + 2; /* pdu + rsvd */

  uint8_t param_len = p_cmd->num_attr + 1;
  /* add length */
  UINT16_TO_BE_STREAM(p_data, param_len);
  UINT8_TO_BE_STREAM(p_data, p_cmd->num_attr);
  for (int count = 0; count < p_cmd->num_attr; count++) {
    UINT8_TO_BE_STREAM(p_data, p_cmd->attrs[count]);
  }
  p_pkt->len = (p_data - p_start);
  return AVRC_STS_NO_ERROR;
}

/*******************************************************************************
 *
 * Function         avrc_bld_get_player_app_setting_value_text_cmd
 *
 * Description      This function builds the get player app setting value
 *                  text command.
 *
 * Returns          AVRC_STS_NO_ERROR, if the command is built successfully
 *                  Otherwise, the error code.
 *
 ******************************************************************************/
static tAVRC_STS avrc_bld_get_player_app_setting_value_text_cmd(
    BT_HDR* p_pkt, tAVRC_GET_APP_VAL_TXT_CMD* p_cmd) {
  LOG_VERBOSE("%s", __func__);

  uint8_t* p_start = (uint8_t*)(p_pkt + 1) + p_pkt->offset;
  uint8_t* p_data = p_start + 2; /* pdu + rsvd */

  uint8_t param_len = p_cmd->num_val + 1;
  /* add length */
  UINT16_TO_BE_STREAM(p_data, param_len);
  UINT8_TO_BE_STREAM(p_data, p_cmd->num_val);
  for (int count = 0; count < p_cmd->num_val; count++) {
    UINT8_TO_BE_STREAM(p_data, p_cmd->vals[count]);
  }
  p_pkt->len = (p_data - p_start);
  return AVRC_STS_NO_ERROR;
}

/*******************************************************************************
 *
 * Function         avrc_bld_get_element_attr_cmd
 *
 * Description      This function builds the get element attribute command.
 *
 * Returns          AVRC_STS_NO_ERROR, if the command is built successfully
 *                  Otherwise, the error code.
 *
 ******************************************************************************/
static tAVRC_STS avrc_bld_get_element_attr_cmd(BT_HDR* p_pkt,
                                               uint8_t num_attrib,
                                               uint32_t* attrib_ids) {
  LOG_VERBOSE("avrc_bld_get_element_attr_cmd");
  uint8_t* p_start = (uint8_t*)(p_pkt + 1) + p_pkt->offset;
  uint8_t* p_data = p_start + 2; /* pdu + rsvd */
  /* we have to store attrib- value pair
   * 1 additional to store num elements
   */
  uint8_t param_len = (4 * num_attrib) + 9;
  /* add length */
  UINT16_TO_BE_STREAM(p_data, param_len);
  /* 8 bytes of identifier as 0 (playing)*/
  UINT32_TO_BE_STREAM(p_data, 0);
  UINT32_TO_BE_STREAM(p_data, 0);
  UINT8_TO_BE_STREAM(p_data, num_attrib);
  for (int count = 0; count < num_attrib; count++) {
    UINT32_TO_BE_STREAM(p_data, attrib_ids[count]);
  }
  p_pkt->len = (p_data - p_start);
  return AVRC_STS_NO_ERROR;
}

/*******************************************************************************
 *
 * Function         avrc_bld_play_item_cmd
 *
 * Description      This function builds the play item cmd
 *
 * Returns          AVRC_STS_NO_ERROR, if the command is built successfully
 *                  Otherwise, the error code.
 *
 ******************************************************************************/
static tAVRC_STS avrc_bld_play_item_cmd(BT_HDR* p_pkt, uint8_t scope,
                                        uint8_t* uid, uint16_t uid_counter) {
  LOG_VERBOSE("avrc_bld_get_element_attr_cmd");
  uint8_t* p_start = (uint8_t*)(p_pkt + 1) + p_pkt->offset;
  uint8_t* p_data = p_start + 2; /* pdu + rsvd */
  /* add fixed length 11 */
  UINT16_TO_BE_STREAM(p_data, 0xb);
  /* Add scope */
  UINT8_TO_BE_STREAM(p_data, scope);
  /* Add UID */
  ARRAY_TO_BE_STREAM(p_data, uid, AVRC_UID_SIZE);
  /* Add UID Counter */
  UINT16_TO_BE_STREAM(p_data, uid_counter);
  p_pkt->len = (p_data - p_start);
  return AVRC_STS_NO_ERROR;
}

/*******************************************************************************
 *
 * Function         avrc_bld_get_play_status_cmd
 *
 * Description      This function builds the get play status command.
 *
 * Returns          AVRC_STS_NO_ERROR, if the command is built successfully
 *                  Otherwise, the error code.
 *
 ******************************************************************************/
static tAVRC_STS avrc_bld_get_play_status_cmd(BT_HDR* p_pkt) {
  LOG_VERBOSE("avrc_bld_list_player_app_attr_cmd");
  uint8_t* p_start = (uint8_t*)(p_pkt + 1) + p_pkt->offset;
  uint8_t* p_data = p_start + 2; /* pdu + rsvd */
  /* add fixed length 0 -*/
  UINT16_TO_BE_STREAM(p_data, 0);
  p_pkt->len = (p_data - p_start);
  return AVRC_STS_NO_ERROR;
}

/*******************************************************************************
 *
 * Function         avrc_bld_get_folder_items_cmd
 *
 * Description      This function builds the get folder items cmd.
 *
 * Returns          AVRC_STS_NO_ERROR, if the command is built successfully
 *                  Otherwise, the error code.
 *
 ******************************************************************************/
static tAVRC_STS avrc_bld_get_folder_items_cmd(BT_HDR* p_pkt,
                                               const tAVRC_GET_ITEMS_CMD* cmd) {
  LOG_VERBOSE(
      "avrc_bld_get_folder_items_cmd scope %d, start_item %d, end_item %d",
      cmd->scope, cmd->start_item, cmd->end_item);
  uint8_t* p_start = (uint8_t*)(p_pkt + 1) + p_pkt->offset;
  /* This is where the PDU specific for AVRC starts
   * AVRCP Spec 1.4 section 22.19 */
  uint8_t* p_data = p_start + 1; /* pdu */

  /* To get the list of all media players we simply need to use the predefined
   * PDU mentioned in above spec. */
  /* scope (1) + st item (4) + end item (4) + attr (1) */
  UINT16_TO_BE_STREAM(p_data, 10);
  UINT8_TO_BE_STREAM(p_data, cmd->scope);       /* scope (1bytes) */
  UINT32_TO_BE_STREAM(p_data, cmd->start_item); /* start item (4bytes) */
  UINT32_TO_BE_STREAM(p_data, cmd->end_item);   /* end item (4bytes) */
  UINT8_TO_BE_STREAM(p_data, 0); /* attribute count = 0 (1bytes) */
  p_pkt->len = (p_data - p_start);
  return AVRC_STS_NO_ERROR;
}

/*******************************************************************************
 *
 * Function         avrc_bld_change_folder_cmd
 *
 * Description      This function builds the change folder command
 *
 * Returns          AVRC_STS_NO_ERROR, if the command is built successfully
 *                  Otherwise, the error code.
 *
 ******************************************************************************/
static tAVRC_STS avrc_bld_change_folder_cmd(BT_HDR* p_pkt,
                                            const tAVRC_CHG_PATH_CMD* cmd) {
  LOG_VERBOSE("avrc_bld_change_folder_cmd");
  uint8_t* p_start = (uint8_t*)(p_pkt + 1) + p_pkt->offset;
  /* This is where the PDU specific for AVRC starts
   * AVRCP Spec 1.4 section 22.19 */
  uint8_t* p_data = p_start + 1; /* pdu */

  /* To change folder we need to provide the following:
   * UID Counter (2) + Direction (1) + UID (8) = 11bytes
   */
  UINT16_TO_BE_STREAM(p_data, 11);
  UINT16_TO_BE_STREAM(p_data, cmd->uid_counter);
  UINT8_TO_BE_STREAM(p_data, cmd->direction);
  ARRAY_TO_BE_STREAM(p_data, cmd->folder_uid, AVRC_UID_SIZE);
  p_pkt->len = (p_data - p_start);
  return AVRC_STS_NO_ERROR;
}
static tAVRC_STS avrc_bld_get_item_attributes_cmd(
    BT_HDR* p_pkt, const tAVRC_GET_ATTRS_CMD* cmd) {
  LOG_VERBOSE("%s", __func__);
  uint8_t* p_start = (uint8_t*)(p_pkt + 1) + p_pkt->offset;
  /* This is where the PDU specific for AVRC starts
   * AVRCP Spec 1.4 section 22.19 */
  uint8_t* p_data = p_start + 1; /* pdu */
  UINT16_TO_BE_STREAM(p_data, 12 + 4 * cmd->attr_count);
  UINT8_TO_BE_STREAM(p_data, cmd->scope);
  uint64_t uid;
  memcpy(&uid, cmd->uid, 8);
  UINT64_TO_BE_STREAM(p_data, uid);
  UINT16_TO_BE_STREAM(p_data, cmd->uid_counter);
  UINT8_TO_BE_STREAM(p_data, cmd->attr_count);
  ARRAY_TO_BE_STREAM(p_data, cmd->p_attr_list, 4 * cmd->attr_count);
  p_pkt->len = (p_data - p_start);
  return AVRC_STS_NO_ERROR;
}
/*******************************************************************************
 *
 * Function         avrc_bld_set_browsed_player_cmd
 *
 * Description      This function builds the set browsed player cmd.
 *
 * Returns          AVRC_STS_NO_ERROR, if the command is built successfully
 *                  Otherwise, the error code.
 *
 ******************************************************************************/
static tAVRC_STS avrc_bld_set_browsed_player_cmd(
    BT_HDR* p_pkt, const tAVRC_SET_BR_PLAYER_CMD* cmd) {
  LOG_VERBOSE("%s", __func__);
  uint8_t* p_start = (uint8_t*)(p_pkt + 1) + p_pkt->offset;
  /* This is where the PDU specific for AVRC starts
   * AVRCP Spec 1.4 section 22.19 */
  uint8_t* p_data = p_start + 1; /* pdu */

  /* To change browsed player the following is the total length:
   * Player ID (2)
   */
  UINT16_TO_BE_STREAM(p_data, 2); /* fixed length */
  UINT16_TO_BE_STREAM(p_data, cmd->player_id);
  p_pkt->len = (p_data - p_start);
  return AVRC_STS_NO_ERROR;
}

/*******************************************************************************
 *
 * Function         avrc_bld_set_addressed_player_cmd
 *
 * Description      This function builds the set addressed player cmd.
 *
 * Returns          AVRC_STS_NO_ERROR, if the command is built successfully
 *                  Otherwise, the error code.
 *
 ******************************************************************************/
static tAVRC_STS avrc_bld_set_addressed_player_cmd(
    BT_HDR* p_pkt, const tAVRC_SET_ADDR_PLAYER_CMD* cmd) {
  LOG_VERBOSE("%s", __func__);
  /* get the existing length, if any, and also the num attributes */
  uint8_t* p_start = (uint8_t*)(p_pkt + 1) + p_pkt->offset;
  uint8_t* p_data = p_start + 2; /* pdu + rsvd */

  /* To change addressed player the following is the total length:
   * Player ID (2)
   */
  UINT16_TO_BE_STREAM(p_data, 2); /* fixed length */
  UINT16_TO_BE_STREAM(p_data, cmd->player_id);
  p_pkt->len = (p_data - p_start);
  return AVRC_STS_NO_ERROR;
}

/*******************************************************************************
 *
 * Function         avrc_bld_init_cmd_buffer
 *
 * Description      This function initializes the command buffer based on PDU
 *
 * Returns          NULL, if no GKI buffer or failure to build the message.
 *                  Otherwise, the GKI buffer that contains the initialized
 *                  message.
 *
 ******************************************************************************/
static BT_HDR* avrc_bld_init_cmd_buffer(tAVRC_COMMAND* p_cmd) {
  uint16_t chnl = AVCT_DATA_CTRL;
  uint8_t opcode = avrc_opcode_from_pdu(p_cmd->pdu);
  LOG_VERBOSE("avrc_bld_init_cmd_buffer: pdu=%x, opcode=%x", p_cmd->pdu,
              opcode);

  uint16_t offset = 0;
  switch (opcode) {
    case AVRC_OP_BROWSE:
      chnl = AVCT_DATA_BROWSE;
      offset = AVCT_BROWSE_OFFSET;
      break;

    case AVRC_OP_PASS_THRU:
      offset = AVRC_MSG_PASS_THRU_OFFSET;
      break;

    case AVRC_OP_VENDOR:
      offset = AVRC_MSG_VENDOR_OFFSET;
      break;
  }

  /* allocate and initialize the buffer */
  BT_HDR* p_pkt = (BT_HDR*)osi_calloc(AVRC_META_CMD_BUF_SIZE);
  uint8_t *p_data, *p_start;

  p_pkt->layer_specific = chnl;
  p_pkt->event = opcode;
  p_pkt->offset = offset;
  p_data = (uint8_t*)(p_pkt + 1) + p_pkt->offset;
  p_start = p_data;

  /* pass thru - group navigation - has a two byte op_id, so dont do it here */
  if (opcode != AVRC_OP_PASS_THRU) *p_data++ = p_cmd->pdu;

  switch (opcode) {
    case AVRC_OP_VENDOR:
      /* reserved 0, packet_type 0 */
      UINT8_TO_BE_STREAM(p_data, 0);
      /* continue to the next "case to add length */
      /* add fixed lenth - 0 */
      UINT16_TO_BE_STREAM(p_data, 0);
      break;
  }

  p_pkt->len = (p_data - p_start);
  p_cmd->cmd.opcode = opcode;

  return p_pkt;
}

/*******************************************************************************
 *
 * Function         AVRC_BldCommand
 *
 * Description      This function builds the given AVRCP command to the given
 *                  GKI buffer
 *
 * Returns          AVRC_STS_NO_ERROR, if the command is built successfully
 *                  Otherwise, the error code.
 *
 ******************************************************************************/
tAVRC_STS AVRC_BldCommand(tAVRC_COMMAND* p_cmd, BT_HDR** pp_pkt) {
  tAVRC_STS status = AVRC_STS_BAD_PARAM;
  bool alloc = false;
  LOG_VERBOSE("AVRC_BldCommand: pdu=%x status=%x", p_cmd->cmd.pdu,
              p_cmd->cmd.status);
  if (!p_cmd || !pp_pkt) {
    LOG_VERBOSE(
        "AVRC_BldCommand. Invalid parameters passed. p_cmd=%p, pp_pkt=%p",
        p_cmd, pp_pkt);
    return AVRC_STS_BAD_PARAM;
  }

  if (*pp_pkt == NULL) {
    *pp_pkt = avrc_bld_init_cmd_buffer(p_cmd);
    if (*pp_pkt == NULL) {
      LOG_VERBOSE("AVRC_BldCommand: Failed to initialize command buffer");
      return AVRC_STS_INTERNAL_ERR;
    }
    alloc = true;
  }
  status = AVRC_STS_NO_ERROR;
  BT_HDR* p_pkt = *pp_pkt;

  switch (p_cmd->pdu) {
    case AVRC_PDU_REQUEST_CONTINUATION_RSP: /*        0x40 */
      status = avrc_bld_next_cmd(&p_cmd->continu, p_pkt);
      break;

    case AVRC_PDU_ABORT_CONTINUATION_RSP: /*          0x41 */
      status = avrc_bld_next_cmd(&p_cmd->abort, p_pkt);
      break;
    case AVRC_PDU_SET_ABSOLUTE_VOLUME: /* 0x50 */
      if (!avrcp_absolute_volume_is_enabled()) {
        break;
      }
      status = avrc_bld_set_abs_volume_cmd(&p_cmd->volume, p_pkt);
      break;
    case AVRC_PDU_REGISTER_NOTIFICATION: /* 0x31 */
      if (!avrcp_absolute_volume_is_enabled()) {
        break;
      }
      status = avrc_bld_register_notifn(p_pkt, p_cmd->reg_notif.event_id,
                                        p_cmd->reg_notif.param);
      break;
    case AVRC_PDU_GET_CAPABILITIES:
      status =
          avrc_bld_get_capability_cmd(p_pkt, p_cmd->get_caps.capability_id);
      break;
    case AVRC_PDU_LIST_PLAYER_APP_ATTR:
      status = avrc_bld_list_player_app_attr_cmd(p_pkt);
      break;
    case AVRC_PDU_LIST_PLAYER_APP_VALUES:
      status = avrc_bld_list_player_app_values_cmd(
          p_pkt, p_cmd->list_app_values.attr_id);
      break;
    case AVRC_PDU_GET_CUR_PLAYER_APP_VALUE:
      status = avrc_bld_get_current_player_app_values_cmd(
          p_pkt, p_cmd->get_cur_app_val.num_attr, p_cmd->get_cur_app_val.attrs);
      break;
    case AVRC_PDU_SET_PLAYER_APP_VALUE:
      status = avrc_bld_set_current_player_app_values_cmd(
          p_pkt, p_cmd->set_app_val.num_val, p_cmd->set_app_val.p_vals);
      break;
    case AVRC_PDU_GET_PLAYER_APP_ATTR_TEXT:
      avrc_bld_get_player_app_setting_attr_text_cmd(p_pkt,
                                                    &p_cmd->get_app_attr_txt);
      break;
    case AVRC_PDU_GET_PLAYER_APP_VALUE_TEXT:
      avrc_bld_get_player_app_setting_value_text_cmd(p_pkt,
                                                     &p_cmd->get_app_val_txt);
      break;
    case AVRC_PDU_GET_ELEMENT_ATTR:
      status = avrc_bld_get_element_attr_cmd(
          p_pkt, p_cmd->get_elem_attrs.num_attr, p_cmd->get_elem_attrs.attrs);
      break;
    case AVRC_PDU_PLAY_ITEM:
      status = avrc_bld_play_item_cmd(p_pkt, p_cmd->play_item.scope,
                                      p_cmd->play_item.uid,
                                      p_cmd->play_item.uid_counter);
      break;
    case AVRC_PDU_GET_PLAY_STATUS:
      status = avrc_bld_get_play_status_cmd(p_pkt);
      break;
    case AVRC_PDU_GET_FOLDER_ITEMS:
      status = avrc_bld_get_folder_items_cmd(p_pkt, &(p_cmd->get_items));
      break;
    case AVRC_PDU_CHANGE_PATH:
      status = avrc_bld_change_folder_cmd(p_pkt, &(p_cmd->chg_path));
      break;
    case AVRC_PDU_GET_ITEM_ATTRIBUTES:
      status = avrc_bld_get_item_attributes_cmd(p_pkt, &(p_cmd->get_attrs));
      break;
    case AVRC_PDU_SET_BROWSED_PLAYER:
      status = avrc_bld_set_browsed_player_cmd(p_pkt, &(p_cmd->br_player));
      break;
    case AVRC_PDU_SET_ADDRESSED_PLAYER:
      status = avrc_bld_set_addressed_player_cmd(p_pkt, &(p_cmd->addr_player));
      break;
  }

  if (alloc && (status != AVRC_STS_NO_ERROR)) {
    osi_free(p_pkt);
    *pp_pkt = NULL;
  }
  LOG_VERBOSE("AVRC_BldCommand: returning %d", status);
  return status;
}