神马文学网tdt段分析
来源：百度文库 编辑：神马文学网 时间：2024/04/29 19:01:08
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);}