stack/avrc/avrc_bld_ct.c - platform/system/bt - Git at Google

 /******************************************************************************
  *
  *  Copyright (C) 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.
  *
  ******************************************************************************/
 #include <string.h>

 #include "bt_common.h"
 #include "avrc_api.h"
 #include "avrc_defs.h"
 #include "avrc_int.h"

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


 #if (AVRC_METADATA_INCLUDED == TRUE)
 /*******************************************************************************
 **
 ** 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   *p_data, *p_start;

     AVRC_TRACE_API("avrc_bld_next_cmd");

     /* get the existing length, if any, and also the num attributes */
     p_start = (UINT8 *)(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
 *****************************************************************************/

 #if (AVRC_ADV_CTRL_INCLUDED == TRUE)
 /*******************************************************************************
 **
 ** 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   *p_data, *p_start;

     AVRC_TRACE_API("avrc_bld_set_abs_volume_cmd");
     /* get the existing length, if any, and also the num attributes */
     p_start = (UINT8 *)(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 event_id, UINT32 event_param)
 {
     UINT8   *p_data, *p_start;

     AVRC_TRACE_API("avrc_bld_register_notifn");
     /* get the existing length, if any, and also the num attributes */
     // Set the notify value
     p_start = (UINT8 *)(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;
 }
 #endif
 #if (AVRC_CTLR_INCLUDED == TRUE)
 /*******************************************************************************
 **
 ** 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 cap_id)
 {
     AVRC_TRACE_API("avrc_bld_get_capability_cmd");
     UINT8 *p_start = (UINT8 *)(p_pkt + 1) + p_pkt->offset;
     UINT8 *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)
 {
     AVRC_TRACE_API("avrc_bld_list_player_app_attr_cmd");
     UINT8 *p_start = (UINT8 *)(p_pkt + 1) + p_pkt->offset;
     UINT8 *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 attrib_id)
 {
     AVRC_TRACE_API("avrc_bld_list_player_app_values_cmd");
     UINT8 *p_start = (UINT8 *)(p_pkt + 1) + p_pkt->offset;
     UINT8 *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 num_attrib_id, UINT8* attrib_ids)
 {
     AVRC_TRACE_API("avrc_bld_get_current_player_app_values_cmd");
     UINT8 *p_start = (UINT8 *)(p_pkt + 1) + p_pkt->offset;
     UINT8 *p_data = p_start + 2; /* pdu + rsvd */
     UINT8 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 num_attrib_id, tAVRC_APP_SETTING* p_val)
 {
     AVRC_TRACE_API("avrc_bld_set_current_player_app_values_cmd");
     UINT8 *p_start = (UINT8 *)(p_pkt + 1) + p_pkt->offset;
     UINT8 *p_data = p_start + 2; /* pdu + rsvd */
     /* we have to store attrib- value pair
      * 1 additional to store num elements
      */
     UINT8 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)
 {
     AVRC_TRACE_API("%s", __FUNCTION__);

     UINT8 *p_start = (UINT8 *)(p_pkt + 1) + p_pkt->offset;
     UINT8 *p_data = p_start + 2; /* pdu + rsvd */

     UINT8 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)
 {
     AVRC_TRACE_API("%s", __FUNCTION__);

     UINT8 *p_start = (UINT8 *)(p_pkt + 1) + p_pkt->offset;
     UINT8 *p_data = p_start + 2; /* pdu + rsvd */

     UINT8 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 num_attrib, UINT32* attrib_ids)
 {
     AVRC_TRACE_API("avrc_bld_get_element_attr_cmd");
     UINT8 *p_start = (UINT8 *)(p_pkt + 1) + p_pkt->offset;
     UINT8 *p_data = p_start + 2; /* pdu + rsvd */
     /* we have to store attrib- value pair
      * 1 additional to store num elements
      */
     UINT8 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_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)
 {
     AVRC_TRACE_API("avrc_bld_list_player_app_attr_cmd");
     UINT8 *p_start = (UINT8 *)(p_pkt + 1) + p_pkt->offset;
     UINT8 *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;
 }
 #endif

 /*******************************************************************************
 **
 ** 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)
 {
     UINT8  opcode = avrc_opcode_from_pdu(p_cmd->pdu);
     AVRC_TRACE_API("avrc_bld_init_cmd_buffer: pdu=%x, opcode=%x", p_cmd->pdu, opcode);

     UINT16 offset = 0;
     switch (opcode)
     {
     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_malloc(AVRC_META_CMD_BUF_SIZE);
     UINT8 *p_data, *p_start;

     p_pkt->layer_specific = AVCT_DATA_CTRL;
     p_pkt->event = opcode;
     p_pkt->offset = offset;
     p_data = (UINT8 *)(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;
     BOOLEAN alloc = FALSE;
     AVRC_TRACE_API("AVRC_BldCommand: pdu=%x status=%x", p_cmd->cmd.pdu, p_cmd->cmd.status);
     if (!p_cmd || !pp_pkt)
     {
         AVRC_TRACE_API("AVRC_BldCommand. Invalid parameters passed. p_cmd=%p, pp_pkt=%p",
             p_cmd, pp_pkt);
         return AVRC_STS_BAD_PARAM;
     }

     if (*pp_pkt == NULL)
     {
         if ((*pp_pkt = avrc_bld_init_cmd_buffer(p_cmd)) == NULL)
         {
             AVRC_TRACE_API("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;
 #if (AVRC_ADV_CTRL_INCLUDED == TRUE)
     case AVRC_PDU_SET_ABSOLUTE_VOLUME:         /* 0x50 */
         status = avrc_bld_set_abs_volume_cmd(&p_cmd->volume, p_pkt);
         break;
 #endif
     case AVRC_PDU_REGISTER_NOTIFICATION:      /* 0x31 */
 #if (AVRC_ADV_CTRL_INCLUDED == TRUE)
         status=avrc_bld_register_notifn(p_pkt,p_cmd->reg_notif.event_id,p_cmd->reg_notif.param);
 #endif
         break;
 #if (AVRC_CTLR_INCLUDED == TRUE)
     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_GET_PLAY_STATUS:
         status = avrc_bld_get_play_status_cmd(p_pkt);
         break;
 #endif
     }

     if (alloc && (status != AVRC_STS_NO_ERROR) )
     {
         osi_free(p_pkt);
         *pp_pkt = NULL;
     }
     AVRC_TRACE_API("AVRC_BldCommand: returning %d", status);
     return status;
 }
 #endif /* (AVRC_METADATA_INCLUDED == TRUE) */
	/******************************************************************************
	*
	* Copyright (C) 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.
	*
	******************************************************************************/
	#include <string.h>

	#include "bt_common.h"
	#include "avrc_api.h"
	#include "avrc_defs.h"
	#include "avrc_int.h"

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


	#if (AVRC_METADATA_INCLUDED == TRUE)
	/*******************************************************************************
	**
	** 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 p_data, p_start;

	AVRC_TRACE_API("avrc_bld_next_cmd");

	/* get the existing length, if any, and also the num attributes */
	p_start = (UINT8 *)(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
	*****************************************************************************/

	#if (AVRC_ADV_CTRL_INCLUDED == TRUE)
	/*******************************************************************************
	**
	** 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 p_data, p_start;

	AVRC_TRACE_API("avrc_bld_set_abs_volume_cmd");
	/* get the existing length, if any, and also the num attributes */
	p_start = (UINT8 *)(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 event_id, UINT32 event_param)
	{
	UINT8 p_data, p_start;

	AVRC_TRACE_API("avrc_bld_register_notifn");
	/* get the existing length, if any, and also the num attributes */
	// Set the notify value
	p_start = (UINT8 *)(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;
	}
	#endif
	#if (AVRC_CTLR_INCLUDED == TRUE)
	/*******************************************************************************
	**
	** 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 cap_id)
	{
	AVRC_TRACE_API("avrc_bld_get_capability_cmd");
	UINT8 p_start = (UINT8 )(p_pkt + 1) + p_pkt->offset;
	UINT8 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)
	{
	AVRC_TRACE_API("avrc_bld_list_player_app_attr_cmd");
	UINT8 p_start = (UINT8 )(p_pkt + 1) + p_pkt->offset;
	UINT8 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 attrib_id)
	{
	AVRC_TRACE_API("avrc_bld_list_player_app_values_cmd");
	UINT8 p_start = (UINT8 )(p_pkt + 1) + p_pkt->offset;
	UINT8 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 num_attrib_id, UINT8* attrib_ids)
	{
	AVRC_TRACE_API("avrc_bld_get_current_player_app_values_cmd");
	UINT8 p_start = (UINT8 )(p_pkt + 1) + p_pkt->offset;
	UINT8 p_data = p_start + 2; / pdu + rsvd */
	UINT8 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 num_attrib_id, tAVRC_APP_SETTING* p_val)
	{
	AVRC_TRACE_API("avrc_bld_set_current_player_app_values_cmd");
	UINT8 p_start = (UINT8 )(p_pkt + 1) + p_pkt->offset;
	UINT8 p_data = p_start + 2; / pdu + rsvd */
	/* we have to store attrib- value pair
	* 1 additional to store num elements
	*/
	UINT8 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)
	{
	AVRC_TRACE_API("%s", __FUNCTION__);

	UINT8 p_start = (UINT8 )(p_pkt + 1) + p_pkt->offset;
	UINT8 p_data = p_start + 2; / pdu + rsvd */

	UINT8 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)
	{
	AVRC_TRACE_API("%s", __FUNCTION__);

	UINT8 p_start = (UINT8 )(p_pkt + 1) + p_pkt->offset;
	UINT8 p_data = p_start + 2; / pdu + rsvd */

	UINT8 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 num_attrib, UINT32* attrib_ids)
	{
	AVRC_TRACE_API("avrc_bld_get_element_attr_cmd");
	UINT8 p_start = (UINT8 )(p_pkt + 1) + p_pkt->offset;
	UINT8 p_data = p_start + 2; / pdu + rsvd */
	/* we have to store attrib- value pair
	* 1 additional to store num elements
	*/
	UINT8 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_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)
	{
	AVRC_TRACE_API("avrc_bld_list_player_app_attr_cmd");
	UINT8 p_start = (UINT8 )(p_pkt + 1) + p_pkt->offset;
	UINT8 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;
	}
	#endif

	/*******************************************************************************
	**
	** 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)
	{
	UINT8 opcode = avrc_opcode_from_pdu(p_cmd->pdu);
	AVRC_TRACE_API("avrc_bld_init_cmd_buffer: pdu=%x, opcode=%x", p_cmd->pdu, opcode);

	UINT16 offset = 0;
	switch (opcode)
	{
	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_malloc(AVRC_META_CMD_BUF_SIZE);
	UINT8 p_data, p_start;

	p_pkt->layer_specific = AVCT_DATA_CTRL;
	p_pkt->event = opcode;
	p_pkt->offset = offset;
	p_data = (UINT8 *)(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;
	BOOLEAN alloc = FALSE;
	AVRC_TRACE_API("AVRC_BldCommand: pdu=%x status=%x", p_cmd->cmd.pdu, p_cmd->cmd.status);
	if (!p_cmd \|\| !pp_pkt)
	{
	AVRC_TRACE_API("AVRC_BldCommand. Invalid parameters passed. p_cmd=%p, pp_pkt=%p",
	p_cmd, pp_pkt);
	return AVRC_STS_BAD_PARAM;
	}

	if (*pp_pkt == NULL)
	{
	if ((*pp_pkt = avrc_bld_init_cmd_buffer(p_cmd)) == NULL)
	{
	AVRC_TRACE_API("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;
	#if (AVRC_ADV_CTRL_INCLUDED == TRUE)
	case AVRC_PDU_SET_ABSOLUTE_VOLUME: /* 0x50 */
	status = avrc_bld_set_abs_volume_cmd(&p_cmd->volume, p_pkt);
	break;
	#endif
	case AVRC_PDU_REGISTER_NOTIFICATION: /* 0x31 */
	#if (AVRC_ADV_CTRL_INCLUDED == TRUE)
	status=avrc_bld_register_notifn(p_pkt,p_cmd->reg_notif.event_id,p_cmd->reg_notif.param);
	#endif
	break;
	#if (AVRC_CTLR_INCLUDED == TRUE)
	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_GET_PLAY_STATUS:
	status = avrc_bld_get_play_status_cmd(p_pkt);
	break;
	#endif
	}

	if (alloc && (status != AVRC_STS_NO_ERROR) )
	{
	osi_free(p_pkt);
	*pp_pkt = NULL;
	}
	AVRC_TRACE_API("AVRC_BldCommand: returning %d", status);
	return status;
	}
	#endif /* (AVRC_METADATA_INCLUDED == TRUE) */