GNU Radio block for interfacing with various radio hardware
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gr-osmosdr/include/osmosdr/time_spec.h

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//
// Copyright 2010-2012 Ettus Research LLC
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
#ifndef INCLUDED_OSMOSDR_TIME_SPEC_H
#define INCLUDED_OSMOSDR_TIME_SPEC_H
#include <osmosdr/api.h>
#include <boost/operators.hpp>
#include <ctime>
namespace osmosdr{
/*!
* A time_spec_t holds a seconds and a fractional seconds time value.
* Depending upon usage, the time_spec_t can represent absolute times,
* relative times, or time differences (between absolute times).
*
* The time_spec_t provides clock-domain independent time storage,
* but can convert fractional seconds to/from clock-domain specific units.
*
* The fractional seconds are stored as double precision floating point.
* This gives the fractional seconds enough precision to unambiguously
* specify a clock-tick/sample-count up to rates of several petahertz.
*/
class OSMOSDR_API time_spec_t : boost::additive<time_spec_t>, boost::totally_ordered<time_spec_t>{
public:
/*!
* Get the system time in time_spec_t format.
* Uses the highest precision clock available.
* \return the system time as a time_spec_t
*/
static time_spec_t get_system_time(void);
/*!
* Create a time_spec_t from a real-valued seconds count.
* \param secs the real-valued seconds count (default = 0)
*/
time_spec_t(double secs = 0);
/*!
* Create a time_spec_t from whole and fractional seconds.
* \param full_secs the whole/integer seconds count
* \param frac_secs the fractional seconds count (default = 0)
*/
time_spec_t(time_t full_secs, double frac_secs = 0);
/*!
* Create a time_spec_t from whole seconds and fractional ticks.
* Translation from clock-domain specific units.
* \param full_secs the whole/integer seconds count
* \param tick_count the fractional seconds tick count
* \param tick_rate the number of ticks per second
*/
time_spec_t(time_t full_secs, long tick_count, double tick_rate);
/*!
* Create a time_spec_t from a 64-bit tick count.
* Translation from clock-domain specific units.
* \param ticks an integer count of ticks
* \param tick_rate the number of ticks per second
*/
static time_spec_t from_ticks(long long ticks, double tick_rate);
/*!
* Convert the fractional seconds to clock ticks.
* Translation into clock-domain specific units.
* \param tick_rate the number of ticks per second
* \return the fractional seconds tick count
*/
long get_tick_count(double tick_rate) const;
/*!
* Convert the time spec into a 64-bit tick count.
* Translation into clock-domain specific units.
* \param tick_rate the number of ticks per second
* \return an integer number of ticks
*/
long long to_ticks(const double tick_rate) const;
/*!
* Get the time as a real-valued seconds count.
* Note: If this time_spec_t represents an absolute time,
* the precision of the fractional seconds may be lost.
* \return the real-valued seconds
*/
double get_real_secs(void) const;
/*!
* Get the whole/integer part of the time in seconds.
* \return the whole/integer seconds
*/
time_t get_full_secs(void) const;
/*!
* Get the fractional part of the time in seconds.
* \return the fractional seconds
*/
double get_frac_secs(void) const;
//! Implement addable interface
time_spec_t &operator+=(const time_spec_t &);
//! Implement subtractable interface
time_spec_t &operator-=(const time_spec_t &);
//private time storage details
private: time_t _full_secs; double _frac_secs;
};
//! Implement equality_comparable interface
OSMOSDR_API bool operator==(const time_spec_t &, const time_spec_t &);
//! Implement less_than_comparable interface
OSMOSDR_API bool operator<(const time_spec_t &, const time_spec_t &);
inline time_t time_spec_t::get_full_secs(void) const{
return this->_full_secs;
}
inline double time_spec_t::get_frac_secs(void) const{
return this->_frac_secs;
}
} //namespace osmosdr
#endif /* INCLUDED_OSMOSDR_TIME_SPEC_H */