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144 lines
4.6 KiB
144 lines
4.6 KiB
/*****************************************************************************
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* datetime.h: ETSI EN 300 468 Date and time functions
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*****************************************************************************
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* Copyright (C) 2009-2010 VideoLAN
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*
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* Authors: Christophe Massiot <massiot@via.ecp.fr>
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* Georgi Chorbadzhiyski <georgi@unixsol.org>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject
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* to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*****************************************************************************/
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#include <bitstream/common.h>
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#include <time.h> /* gmtime_r, time_t */
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#include <stdio.h> /* sprintf */
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/*
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* Normative references:
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* - ETSI EN 300 468 V1.11.1 (2010-04) (SI in DVB systems)
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*/
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#ifndef __BITSTREAM_DVB_DATETIME_H__
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#define __BITSTREAM_DVB_DATETIME_H__
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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/*****************************************************************************
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* DVB Date and time functions
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*****************************************************************************/
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/* EN 300 468 Annex C, year is from 1900 */
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static inline uint16_t dvb_mjd_set(int y, int m, int d)
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{
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int l = (m == 1 || m == 2) ? 1 : 0;
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int mjd = 14956 + d + (y - l) * 1461 / 4 + (m + 1 + l * 12) * 306001 / 10000;
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return (uint16_t)mjd;
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}
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static inline void dvb_mjd_get(uint16_t mjd, int *y, int *m, int *d)
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{
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int k;
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int yp = (mjd * 20 - 301564) / 7305;
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int mp = (mjd * 10000 - 149561000 - yp * 3652500) / 306001;
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*d = mjd - 14956 - yp * 1461 / 4 - mp * 306001 / 10000;
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k = (mp == 14 || mp == 15) ? 1 : 0;
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*y = yp + k;
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*m = mp - 1 - k * 12;
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}
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#define bcd2dec(__bcd) (int)((((__bcd) >> 4) * 10) + (__bcd) % 16)
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static inline void dvb_time_decode_bcd(uint32_t bcd, int *seconds, int *hour, int *min, int *sec) {
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*hour = bcd2dec( (bcd >> 16) & 0xff );
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*min = bcd2dec( (bcd >> 8) & 0xff );
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*sec = bcd2dec( bcd & 0xff );
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if (seconds)
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*seconds = *hour * 3600 + *min * 60 + *sec;
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}
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#undef bcd2dec
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static inline time_t dvb_time_decode_UTC(uint64_t UTC_time) {
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struct tm tm;
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uint16_t mjd = (UTC_time >> 24) & 0xffff;
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uint32_t bcd = UTC_time & 0xffffff;
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dvb_mjd_get(mjd, &tm.tm_year, &tm.tm_mon, &tm.tm_mday);
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/* DVB months are 1..12, struct tm needs 0..11 */
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tm.tm_mon -= 1;
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dvb_time_decode_bcd(bcd, NULL, &tm.tm_hour, &tm.tm_min, &tm.tm_sec);
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return timegm(&tm);
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}
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#define dec2bcd(__dec) (int)((((__dec)/10) << 4) + (__dec) % 10)
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static inline uint64_t dvb_time_encode_UTC(time_t ts) {
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struct tm tm;
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uint16_t mjd = 0;
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uint32_t bcd = 0;
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gmtime_r(&ts, &tm);
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mjd = dvb_mjd_set(tm.tm_year, tm.tm_mon + 1, tm.tm_mday);
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bcd = dec2bcd(tm.tm_hour) << 16;
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bcd |= dec2bcd(tm.tm_min ) << 8;
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bcd |= dec2bcd(tm.tm_sec );
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return (uint64_t)((uint64_t)mjd << 24) | bcd;
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}
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static inline uint32_t dvb_time_encode_duration(unsigned int duration_sec)
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{
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unsigned int t_sec, t_min, t_hour, ret;
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t_sec = duration_sec % 60;
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t_min = (duration_sec - t_sec) / 60;
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t_hour = (t_min - t_min % 60) / 60;
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t_min = t_min - t_hour * 60;
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ret = dec2bcd(t_hour) << 16;
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ret |= dec2bcd(t_min ) << 8;
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ret |= dec2bcd(t_sec );
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return ret;
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}
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#undef dec2bcd
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static inline time_t dvb_time_format_UTC(uint64_t UTC_time, struct tm *tm, char *output) {
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struct tm tm_local;
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if (tm == NULL)
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tm = &tm_local;
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time_t ts = dvb_time_decode_UTC(UTC_time);
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tm = gmtime_r(&ts, tm);
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if (output)
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sprintf(output, "%04d-%02d-%02d %02d:%02d:%02d UTC",
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tm->tm_year+1900, tm->tm_mon+1, tm->tm_mday,
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tm->tm_hour, tm->tm_min, tm->tm_sec);
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return ts;
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}
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#ifdef __cplusplus
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}
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#endif
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#endif
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