/******************************************************************************
*
* Copyright (C) 2002-2012 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.
*
******************************************************************************/
/******************************************************************************
*
* Utility functions to help build and parse SBC Codec Information Element
* and Media Payload.
*
******************************************************************************/
#include "bt_target.h"
#include <string.h>
#include "a2d_api.h"
#include "a2d_int.h"
#include "a2d_sbc.h"
#include "bt_utils.h"
/******************************************************************************
**
** Function A2D_BldSbcInfo
**
** Description This function is called by an application to build
** the SBC Media Codec Capabilities byte sequence
** beginning from the LOSC octet.
** Input Parameters:
** media_type: Indicates Audio, or Multimedia.
**
** p_ie: The SBC Codec Information Element information.
**
** Output Parameters:
** p_result: the resulting codec info byte sequence.
**
** Returns A2D_SUCCESS if function execution succeeded.
** Error status code, otherwise.
******************************************************************************/
tA2D_STATUS A2D_BldSbcInfo(UINT8 media_type, tA2D_SBC_CIE *p_ie, UINT8 *p_result)
{
tA2D_STATUS status;
if( p_ie == NULL || p_result == NULL ||
(p_ie->samp_freq & ~A2D_SBC_IE_SAMP_FREQ_MSK) ||
(p_ie->ch_mode & ~A2D_SBC_IE_CH_MD_MSK) ||
(p_ie->block_len & ~A2D_SBC_IE_BLOCKS_MSK) ||
(p_ie->num_subbands & ~A2D_SBC_IE_SUBBAND_MSK) ||
(p_ie->alloc_mthd & ~A2D_SBC_IE_ALLOC_MD_MSK) ||
(p_ie->max_bitpool < p_ie->min_bitpool) ||
(p_ie->max_bitpool < A2D_SBC_IE_MIN_BITPOOL) ||
(p_ie->max_bitpool > A2D_SBC_IE_MAX_BITPOOL) ||
(p_ie->min_bitpool < A2D_SBC_IE_MIN_BITPOOL) ||
(p_ie->min_bitpool > A2D_SBC_IE_MAX_BITPOOL) )
{
/* if any unused bit is set */
status = A2D_INVALID_PARAMS;
}
else
{
status = A2D_SUCCESS;
*p_result++ = A2D_SBC_INFO_LEN;
*p_result++ = media_type;
*p_result++ = A2D_MEDIA_CT_SBC;
/* Media Codec Specific Information Element */
*p_result++ = p_ie->samp_freq | p_ie->ch_mode;
*p_result++ = p_ie->block_len | p_ie->num_subbands | p_ie->alloc_mthd;
*p_result++ = p_ie->min_bitpool;
*p_result = p_ie->max_bitpool;
}
return status;
}
/******************************************************************************
**
** Function A2D_ParsSbcInfo
**
** Description This function is called by an application to parse
** the SBC Media Codec Capabilities byte sequence
** beginning from the LOSC octet.
** Input Parameters:
** p_info: the byte sequence to parse.
**
** for_caps: TRUE, if the byte sequence is for get capabilities response.
**
** Output Parameters:
** p_ie: The SBC Codec Information Element information.
**
** Returns A2D_SUCCESS if function execution succeeded.
** Error status code, otherwise.
******************************************************************************/
tA2D_STATUS A2D_ParsSbcInfo(tA2D_SBC_CIE *p_ie, const UINT8 *p_info,
BOOLEAN for_caps)
{
tA2D_STATUS status = A2D_SUCCESS;
UINT8 losc;
if (p_ie == NULL || p_info == NULL)
return A2D_INVALID_PARAMS;
losc = *p_info;
p_info += 2;
/* If the function is called for the wrong Media Type or Media Codec Type */
if (losc != A2D_SBC_INFO_LEN || *p_info != A2D_MEDIA_CT_SBC)
return A2D_WRONG_CODEC;
p_info++;
p_ie->samp_freq = *p_info & A2D_SBC_IE_SAMP_FREQ_MSK;
p_ie->ch_mode = *p_info & A2D_SBC_IE_CH_MD_MSK;
p_info++;
p_ie->block_len = *p_info & A2D_SBC_IE_BLOCKS_MSK;
p_ie->num_subbands = *p_info & A2D_SBC_IE_SUBBAND_MSK;
p_ie->alloc_mthd = *p_info & A2D_SBC_IE_ALLOC_MD_MSK;
p_info++;
p_ie->min_bitpool = *p_info++;
p_ie->max_bitpool = *p_info;
if (p_ie->min_bitpool < A2D_SBC_IE_MIN_BITPOOL || p_ie->min_bitpool > A2D_SBC_IE_MAX_BITPOOL )
status = A2D_BAD_MIN_BITPOOL;
if (p_ie->max_bitpool < A2D_SBC_IE_MIN_BITPOOL || p_ie->max_bitpool > A2D_SBC_IE_MAX_BITPOOL ||
p_ie->max_bitpool < p_ie->min_bitpool)
status = A2D_BAD_MAX_BITPOOL;
if (for_caps != FALSE)
return status;
if (A2D_BitsSet(p_ie->samp_freq) != A2D_SET_ONE_BIT)
status = A2D_BAD_SAMP_FREQ;
if (A2D_BitsSet(p_ie->ch_mode) != A2D_SET_ONE_BIT)
status = A2D_BAD_CH_MODE;
if (A2D_BitsSet(p_ie->block_len) != A2D_SET_ONE_BIT)
status = A2D_BAD_BLOCK_LEN;
if (A2D_BitsSet(p_ie->num_subbands) != A2D_SET_ONE_BIT)
status = A2D_BAD_SUBBANDS;
if (A2D_BitsSet(p_ie->alloc_mthd) != A2D_SET_ONE_BIT)
status = A2D_BAD_ALLOC_MTHD;
return status;
}
/******************************************************************************
**
** Function A2D_BldSbcMplHdr
**
** Description This function is called by an application to parse
** the SBC Media Payload header.
** Input Parameters:
** frag: 1, if fragmented. 0, otherwise.
**
** start: 1, if the starting packet of a fragmented frame.
**
** last: 1, if the last packet of a fragmented frame.
**
** num: If frag is 1, this is the number of remaining fragments
** (including this fragment) of this frame.
** If frag is 0, this is the number of frames in this packet.
**
** Output Parameters:
** p_dst: the resulting media payload header byte sequence.
**
** Returns void.
******************************************************************************/
void A2D_BldSbcMplHdr(UINT8 *p_dst, BOOLEAN frag, BOOLEAN start, BOOLEAN last, UINT8 num)
{
if(p_dst)
{
*p_dst = 0;
if(frag)
*p_dst |= A2D_SBC_HDR_F_MSK;
if(start)
*p_dst |= A2D_SBC_HDR_S_MSK;
if(last)
*p_dst |= A2D_SBC_HDR_L_MSK;
*p_dst |= (A2D_SBC_HDR_NUM_MSK & num);
}
}
/******************************************************************************
**
** Function A2D_ParsSbcMplHdr
**
** Description This function is called by an application to parse
** the SBC Media Payload header.
** Input Parameters:
** p_src: the byte sequence to parse..
**
** Output Parameters:
** frag: 1, if fragmented. 0, otherwise.
**
** start: 1, if the starting packet of a fragmented frame.
**
** last: 1, if the last packet of a fragmented frame.
**
** num: If frag is 1, this is the number of remaining fragments
** (including this fragment) of this frame.
** If frag is 0, this is the number of frames in this packet.
**
** Returns void.
******************************************************************************/
void A2D_ParsSbcMplHdr(UINT8 *p_src, BOOLEAN *p_frag, BOOLEAN *p_start, BOOLEAN *p_last, UINT8 *p_num)
{
if(p_src && p_frag && p_start && p_last && p_num)
{
*p_frag = (*p_src & A2D_SBC_HDR_F_MSK) ? TRUE: FALSE;
*p_start= (*p_src & A2D_SBC_HDR_S_MSK) ? TRUE: FALSE;
*p_last = (*p_src & A2D_SBC_HDR_L_MSK) ? TRUE: FALSE;
*p_num = (*p_src & A2D_SBC_HDR_NUM_MSK);
}
}