tdt段分析

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int32 BCD_Seconds(u_int32 _time)

{

u_int32 temp;

u_int32 hour, minute, second;

temp = bcdint_to_int(_time&0xffffff, 6, 6, 1);

hour = temp/10000;

minute = temp/100 - hour*100;

second = temp - hour*10000 - minute*100;

temp = hour*3600 + minute*60 + second;

return (temp);

}

/* si_parser_sdt_analyse */

/*************************************************************************************/

/* */

/*************************************************************************************/

int32 MJD_year_month_day(u_int32 date)

{

u_int32 month, day;

u_int32 temp, year;

u_int32 temp1;

temp = (u_int32)date;

year = (temp*100 - 1507820)/36525;

temp1 = year*36525/100;

month = (temp*10 - 149561 - temp1*10)/306.001;

day = temp - 14956 - temp1 - (month*306001/10000);

if((month == 14) || (month == 15))

{

year++;

month = month -1 - 12;

}

else

month--;

year += 1900;

return ((year&0xffff)<<16 | (month&0xff)<<8 | (day&0xff));

}

/* si_parser_eit_analyse */

/****************************************************************************/

/* FUNCTION: si_parser_tdt_analyse */

/* */

/* DESCRIPTION: */

/* */

/* INPUTS: */

/* */

/* OUTPUTS: */

/* */

/* RETURNS: */

/* */

/* NOTES: NONE */

/* */

/* CONTEXT: Must be called from a non-interrupt context. */

/* */

/****************************************************************************/

static SI_STATUS si_parser_tdt_analyse (

SI_TDT_HANDLE hTDT,

u_int32 uLen,

u_int8 * pData

)

{

PTR_TDT_TABLE pTDT = (PTR_TDT_TABLE)(hTDT);

u_int8 * pBuffer = pData;

TDT_INFO * pInfo;

u_int8 tbl_id, sct_syntax_indicator;

u_int16 sct_length;

u_int32 date;

START_TIME _time;

SI_PARSER_HANDLE handle;

if ((NULL == pTDT) || (uLen < 8) || (NULL == pBuffer))

{

return (SI_ERROR);

}

/* analyse the header of the section: total 8 bytes */

tbl_id = *pBuffer++;

sct_syntax_indicator = (*pBuffer & 0x80);

sct_length = (*pBuffer++ & 0x0F) << 8;

sct_length |= *pBuffer++;

/* check the header information of the section. */

if ((tbl_id != TID_MPEG2_TDT) || (sct_syntax_indicator != 0x00) ||

(sct_length > 5) || ((sct_length + 3) != (u_int16)uLen))

{

return (SI_ERROR);

}

pInfo = &(pTDT->sTDTInfo);

pInfo->UTC_date = (*pBuffer++ ) << 8;

pInfo->UTC_date |= *pBuffer++;

pInfo->UTC_time = (*pBuffer++ ) <<16;

pInfo->UTC_time |= (*pBuffer++ ) << 8;

pInfo->UTC_time |= *pBuffer;

date = MJD_year_month_day(pInfo->UTC_date);

_time.year = date>>16 & 0xffff;

_time.month = date>>8 & 0xff;

_time.day = date & 0xff;

_time.time.seconds = BCD_Seconds((u_int32)(pInfo->UTC_time)&0xffffff);

if (NULL != pTDT->pfCbSection)

{

pTDT->pfCbSection ();

}

if (NULL != pTDT->pfCbSingleSection)

{

/* fixme, other method shoud be called to get si_parser handle */

handle = (SI_PARSER_HANDLE)(&siParser);

pTDT->pfCbSingleSection(handle, &_time);

}

return (SI_OK);

}