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/*****************************************************************************
**
** Name: a2d_m24.c
**
** Description:utility functions to help build and parse MPEG-2, 4 AAC
** 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_M24_INCLUDED == TRUE)
#include "a2d_api.h"
#include "a2d_int.h"
#include "a2d_m24.h"
/******************************************************************************
**
** Function A2D_BldM24Info
**
** Description This function is called by an application to build
** the MPEG-2, 4 AAC Media Codec Capabilities byte sequence
** beginning from the LOSC octet.
** Input Parameters:
** media_type: Indicates Audio, or Multimedia.
**
** p_ie: MPEG-2, 4 AAC 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_BldM24Info(UINT8 media_type, tA2D_M24_CIE *p_ie, UINT8 *p_result)
{
tA2D_STATUS status;
UINT16 bitrate45;
if( p_ie == NULL || p_result == NULL ||
(p_ie->obj_type & ~A2D_M24_IE_OBJ_MSK) ||
(p_ie->samp_freq & ~A2D_M24_IE_SAMP_FREQ_MSK) ||
(p_ie->chnl & ~A2D_M24_IE_CHNL_MSK) ||
(p_ie->bitrate & ~A2D_M24_IE_BITRATE_MSK))
{
/* if any unused bit is set */
status = A2D_INVALID_PARAMS;
}
else
{
status = A2D_SUCCESS;
*p_result++ = A2D_M24_INFO_LEN;
*p_result++ = media_type;
*p_result++ = A2D_MEDIA_CT_M24;
/* Media Codec Specific Information Element */
*p_result++ = p_ie->obj_type;
UINT16_TO_BE_STREAM(p_result, p_ie->samp_freq);
p_result--;
*p_result++ |= p_ie->chnl;
*p_result = (p_ie->bitrate & A2D_M24_IE_BITRATE3_MSK) >> 16;
if(p_ie->vbr)
*p_result |= A2D_M24_IE_VBR_MSK;
p_result++;
bitrate45 = (UINT16)(p_ie->bitrate & A2D_M24_IE_BITRATE45_MSK);
UINT16_TO_BE_STREAM(p_result, bitrate45);
}
return status;
}
/******************************************************************************
**
** Function A2D_ParsM24Info
**
** Description This function is called by an application to parse
** the MPEG-2, 4 AAC 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: MPEG-2, 4 AAC Codec Information Element information.
**
** Returns A2D_SUCCESS if function execution succeeded.
** Error status code, otherwise.
******************************************************************************/
tA2D_STATUS A2D_ParsM24Info(tA2D_M24_CIE *p_ie, UINT8 *p_info, BOOLEAN for_caps)
{
tA2D_STATUS status;
UINT8 vbr;
UINT16 u16;
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_M24_INFO_LEN || *p_info != A2D_MEDIA_CT_M24)
status = A2D_WRONG_CODEC;
else
{
p_info++;
p_ie->obj_type = *p_info++;
BE_STREAM_TO_UINT16(p_ie->samp_freq, p_info);
p_ie->chnl = p_ie->samp_freq & A2D_M24_IE_CHNL_MSK;
p_ie->samp_freq &= A2D_M24_IE_SAMP_FREQ_MSK;
vbr = *p_info++;
BE_STREAM_TO_UINT16(u16, p_info); /* u16 contains the octect4, 5 of bterate */
p_ie->vbr = (vbr & A2D_M24_IE_VBR_MSK) >> 7;
vbr &= ~A2D_M24_IE_VBR_MSK; /* vbr has become the octect3 of bitrate */
p_ie->bitrate = vbr;
p_ie->bitrate <<= 16;
p_ie->bitrate += u16;
status = A2D_SUCCESS;
if(for_caps == FALSE)
{
if(A2D_BitsSet(p_ie->obj_type) != A2D_SET_ONE_BIT)
status = A2D_BAD_OBJ_TYPE;
if((A2D_BitsSet((UINT8)(p_ie->samp_freq&0xFF)) +
A2D_BitsSet((UINT8)((p_ie->samp_freq&0xFF00)>>8)))!= A2D_SET_ONE_BIT)
status = A2D_BAD_SAMP_FREQ;
if(A2D_BitsSet(p_ie->chnl) != A2D_SET_ONE_BIT)
status = A2D_BAD_CHANNEL;
/* BitRate must be greater than zero when specifying AAC configuration */
if (p_ie->bitrate == 0)
status = A2D_BAD_BIT_RATE;
}
}
}
return status;
}
#endif /* (A2D_M24_INCLUDED == TRUE) */
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