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/*****************************************************************************
**
** Name: a2d_m12.c
**
** Description:utility functions to help build and parse MPEG-1, 2 Audio
** Codec Information Element and Media Payload.
** Copyright (c) 2002-2004, WIDCOMM Inc., All Rights Reserved.
** WIDCOMM Bluetooth Core. Proprietary and confidential.
**
*****************************************************************************/
#include "bt_target.h"
#if (A2D_M12_INCLUDED == TRUE)
#include "a2d_api.h"
#include "a2d_int.h"
#include "a2d_m12.h"
/******************************************************************************
**
** Function A2D_BldM12Info
**
** Description This function is called by an application to build
** the MPEG-1, 2 Audio Media Codec Capabilities byte sequence
** beginning from the LOSC octet.
** media_type: Indicates Audio, or Multimedia.
**
** p_ie: The MPEG-1, 2 Audio 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_BldM12Info(UINT8 media_type, tA2D_M12_CIE *p_ie, UINT8 *p_result)
{
tA2D_STATUS status;
UINT8 *p_vbr;
if( p_ie == NULL || p_result == NULL ||
(p_ie->layer & ~A2D_M12_IE_LAYER_MSK) ||
(p_ie->ch_mode & ~A2D_M12_IE_CH_MD_MSK) ||
(p_ie->samp_freq & ~A2D_M12_IE_SAMP_FREQ_MSK) ||
(p_ie->bitrate & ~A2D_M12_IE_BITRATE_MSK))
{
/* if any unused bit is set */
status = A2D_INVALID_PARAMS;
}
else
{
status = A2D_SUCCESS;
*p_result++ = A2D_M12_INFO_LEN;
*p_result++ = media_type;
*p_result++ = A2D_MEDIA_CT_M12;
/* Media Codec Specific Information Element */
*p_result = p_ie->layer | p_ie->ch_mode;
if(p_ie->crc)
*p_result |= A2D_M12_IE_CRC_MSK;
p_result++;
*p_result = p_ie->samp_freq;
if(p_ie->mpf)
*p_result |= A2D_M12_IE_MPF_MSK;
p_result++;
p_vbr = p_result;
UINT16_TO_BE_STREAM(p_result, p_ie->bitrate);
if(p_ie->vbr)
*p_vbr |= A2D_M12_IE_VBR_MSK;
}
return status;
}
/******************************************************************************
**
** Function A2D_ParsM12Info
**
** Description This function is called by an application to parse
** the MPEG-1, 2 Audio 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 MPEG-1, 2 Audio Codec Information Element information.
**
** Returns A2D_SUCCESS if function execution succeeded.
** Error status code, otherwise.
******************************************************************************/
tA2D_STATUS A2D_ParsM12Info(tA2D_M12_CIE *p_ie, UINT8 *p_info, BOOLEAN for_caps)
{
tA2D_STATUS status;
UINT8 losc;
UINT8 mt;
if( p_ie == NULL || p_info == NULL)
status = A2D_INVALID_PARAMS;
else
{
losc = *p_info++;
mt = *p_info++;
/* If the function is called for the wrong Media Type or Media Codec Type */
if(losc != A2D_M12_INFO_LEN || *p_info != A2D_MEDIA_CT_M12)
status = A2D_WRONG_CODEC;
else
{
p_info++;
p_ie->layer = *p_info & A2D_M12_IE_LAYER_MSK;
p_ie->crc = (*p_info & A2D_M12_IE_CRC_MSK) >> 4;
p_ie->ch_mode = *p_info & A2D_M12_IE_CH_MD_MSK;
p_info++;
p_ie->mpf = (*p_info & A2D_M12_IE_MPF_MSK) >> 6;
p_ie->samp_freq = *p_info & A2D_M12_IE_SAMP_FREQ_MSK;
p_info++;
p_ie->vbr = (*p_info & A2D_M12_IE_VBR_MSK) >> 7;
BE_STREAM_TO_UINT16(p_ie->bitrate, p_info);
p_ie->bitrate &= A2D_M12_IE_BITRATE_MSK;
status = A2D_SUCCESS;
if(for_caps == FALSE)
{
if(A2D_BitsSet(p_ie->layer) != A2D_SET_ONE_BIT)
status = A2D_BAD_LAYER;
if(A2D_BitsSet(p_ie->ch_mode) != A2D_SET_ONE_BIT)
status = A2D_BAD_CH_MODE;
if(A2D_BitsSet(p_ie->samp_freq) != A2D_SET_ONE_BIT)
status = A2D_BAD_SAMP_FREQ;
if((A2D_BitsSet((UINT8)(p_ie->bitrate&0xFF)) +
A2D_BitsSet((UINT8)((p_ie->bitrate&0xFF00)>>8)))!= A2D_SET_ONE_BIT)
status = A2D_BAD_BIT_RATE;
}
}
}
return status;
}
#endif /* A2D_M12_INCLUDED == TRUE */
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