Commit 799d034b authored by Georgi Chorbadzhiyski's avatar Georgi Chorbadzhiyski

dvb/si/datetime: Add more helper functions.

parent 486f8a3c
......@@ -4,6 +4,7 @@
* Copyright (C) 2009-2010 VideoLAN
*
* Authors: Christophe Massiot <massiot@via.ecp.fr>
* Georgi Chorbadzhiyski <georgi@unixsol.org>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
......@@ -27,6 +28,9 @@
#include <bitstream/common.h>
#include <time.h> /* gmtime_r, time_t */
#include <stdio.h> /* sprintf */
/*
* Normative references:
* - ETSI EN 300 468 V1.11.1 (2010-04) (SI in DVB systems)
......@@ -63,6 +67,76 @@ static inline void dvb_mjd_get(uint16_t mjd, int *y, int *m, int *d)
*m = mp - 1 - k * 12;
}
#define bcd2dec(__bcd) (int)((((__bcd) >> 4) * 10) + (__bcd) % 16)
static inline void dvb_time_decode_bcd(uint32_t bcd, int *seconds, int *hour, int *min, int *sec) {
*hour = bcd2dec( (bcd >> 16) & 0xff );
*min = bcd2dec( (bcd >> 8) & 0xff );
*sec = bcd2dec( bcd & 0xff );
if (seconds)
*seconds = *hour * 3600 + *min * 60 + *sec;
}
#undef bcd2dec
static inline time_t dvb_time_decode_UTC(uint64_t UTC_time) {
struct tm tm;
uint16_t mjd = (UTC_time >> 24) & 0xffff;
uint32_t bcd = UTC_time & 0xffffff;
dvb_mjd_get(mjd, &tm.tm_year, &tm.tm_mon, &tm.tm_mday);
/* DVB months are 1..12, struct tm needs 0..11 */
tm.tm_mon -= 1;
dvb_time_decode_bcd(bcd, NULL, &tm.tm_hour, &tm.tm_min, &tm.tm_sec);
return timegm(&tm);
}
#define dec2bcd(__dec) (int)((((__dec)/10) << 4) + (__dec) % 10)
static inline uint64_t dvb_time_encode_UTC(time_t ts) {
struct tm tm;
uint16_t mjd = 0;
uint32_t bcd = 0;
gmtime_r(&ts, &tm);
mjd = dvb_mjd_set(tm.tm_year, tm.tm_mon + 1, tm.tm_mday);
bcd = dec2bcd(tm.tm_hour) << 16;
bcd |= dec2bcd(tm.tm_min ) << 8;
bcd |= dec2bcd(tm.tm_sec );
return (uint64_t)((uint64_t)mjd << 24) | bcd;
}
static inline uint32_t dvb_time_encode_duration(unsigned int duration_sec)
{
unsigned int t_sec, t_min, t_hour, ret;
t_sec = duration_sec % 60;
t_min = (duration_sec - t_sec) / 60;
t_hour = (t_min - t_min % 60) / 60;
t_min = t_min - t_hour * 60;
ret = dec2bcd(t_hour) << 16;
ret |= dec2bcd(t_min ) << 8;
ret |= dec2bcd(t_sec );
return ret;
}
#undef dec2bcd
static time_t dvb_time_format_UTC(uint64_t UTC_time, struct tm *tm, char *output) {
struct tm tm_local;
if (tm == NULL)
tm = &tm_local;
time_t ts = dvb_time_decode_UTC(UTC_time);
tm = gmtime_r(&ts, tm);
if (output)
sprintf(output, "%04d-%02d-%02d %02d:%02d:%02d UTC",
tm->tm_year+1900, tm->tm_mon+1, tm->tm_mday,
tm->tm_hour, tm->tm_min, tm->tm_sec);
return ts;
}
#ifdef __cplusplus
}
#endif
......
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