GNU Radio block for interfacing with various radio hardware
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gr-osmosdr/lib/time_spec.cc

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//
// Copyright 2011-2013 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/>.
//
#include <osmosdr/time_spec.h>
#include <ciso646>
using namespace osmosdr;
/***********************************************************************
* Time spec system time
**********************************************************************/
#ifdef HAVE_CLOCK_GETTIME
#include <time.h>
time_spec_t time_spec_t::get_system_time(void){
timespec ts; clock_gettime(CLOCK_MONOTONIC, &ts);
return time_spec_t(ts.tv_sec, ts.tv_nsec, 1e9);
}
#endif /* HAVE_CLOCK_GETTIME */
#ifdef HAVE_MACH_ABSOLUTE_TIME
#include <mach/mach_time.h>
time_spec_t time_spec_t::get_system_time(void){
mach_timebase_info_data_t info; mach_timebase_info(&info);
intmax_t nanosecs = mach_absolute_time()*info.numer/info.denom;
return time_spec_t::from_ticks(nanosecs, 1e9);
}
#endif /* HAVE_MACH_ABSOLUTE_TIME */
#ifdef HAVE_QUERY_PERFORMANCE_COUNTER
#include <Windows.h>
time_spec_t time_spec_t::get_system_time(void){
LARGE_INTEGER counts, freq;
QueryPerformanceCounter(&counts);
QueryPerformanceFrequency(&freq);
return time_spec_t::from_ticks(counts.QuadPart, double(freq.QuadPart));
}
#endif /* HAVE_QUERY_PERFORMANCE_COUNTER */
#ifdef HAVE_MICROSEC_CLOCK
#include <boost/date_time/posix_time/posix_time.hpp>
namespace pt = boost::posix_time;
time_spec_t time_spec_t::get_system_time(void){
pt::ptime time_now = pt::microsec_clock::universal_time();
pt::time_duration time_dur = time_now - pt::from_time_t(0);
return time_spec_t(
time_t(time_dur.total_seconds()),
long(time_dur.fractional_seconds()),
double(pt::time_duration::ticks_per_second())
);
}
#endif /* HAVE_MICROSEC_CLOCK */
/***********************************************************************
* Time spec constructors
**********************************************************************/
#define time_spec_init(full, frac) { \
const time_t _full = time_t(full); \
const double _frac = double(frac); \
const int _frac_int = int(_frac); \
_full_secs = _full + _frac_int; \
_frac_secs = _frac - _frac_int; \
if (_frac_secs < 0) {\
_full_secs -= 1; \
_frac_secs += 1; \
} \
}
inline long long fast_llround(const double x){
return (long long)(x + 0.5); // assumption of non-negativity
}
time_spec_t::time_spec_t(double secs){
time_spec_init(0, secs);
}
time_spec_t::time_spec_t(time_t full_secs, double frac_secs){
time_spec_init(full_secs, frac_secs);
}
time_spec_t::time_spec_t(time_t full_secs, long tick_count, double tick_rate){
const double frac_secs = tick_count/tick_rate;
time_spec_init(full_secs, frac_secs);
}
time_spec_t time_spec_t::from_ticks(long long ticks, double tick_rate){
const long long rate_i = (long long)(tick_rate);
const double rate_f = tick_rate - rate_i;
const time_t secs_full = time_t(ticks/rate_i);
const long long ticks_error = ticks - (secs_full*rate_i);
const double ticks_frac = ticks_error - secs_full*rate_f;
return time_spec_t(secs_full, ticks_frac/tick_rate);
}
/***********************************************************************
* Time spec accessors
**********************************************************************/
long time_spec_t::get_tick_count(double tick_rate) const{
return long(fast_llround(this->get_frac_secs()*tick_rate));
}
long long time_spec_t::to_ticks(double tick_rate) const{
const long long rate_i = (long long)(tick_rate);
const double rate_f = tick_rate - rate_i;
const long long ticks_full = this->get_full_secs()*rate_i;
const double ticks_error = this->get_full_secs()*rate_f;
const double ticks_frac = this->get_frac_secs()*tick_rate;
return ticks_full + fast_llround(ticks_error + ticks_frac);
}
double time_spec_t::get_real_secs(void) const{
return this->get_full_secs() + this->get_frac_secs();
}
/***********************************************************************
* Time spec math overloads
**********************************************************************/
time_spec_t &time_spec_t::operator+=(const time_spec_t &rhs){
time_spec_init(
this->get_full_secs() + rhs.get_full_secs(),
this->get_frac_secs() + rhs.get_frac_secs()
);
return *this;
}
time_spec_t &time_spec_t::operator-=(const time_spec_t &rhs){
time_spec_init(
this->get_full_secs() - rhs.get_full_secs(),
this->get_frac_secs() - rhs.get_frac_secs()
);
return *this;
}
bool osmosdr::operator==(const time_spec_t &lhs, const time_spec_t &rhs){
return
lhs.get_full_secs() == rhs.get_full_secs() and
lhs.get_frac_secs() == rhs.get_frac_secs()
;
}
bool osmosdr::operator<(const time_spec_t &lhs, const time_spec_t &rhs){
return (
(lhs.get_full_secs() < rhs.get_full_secs()) or (
(lhs.get_full_secs() == rhs.get_full_secs()) and
(lhs.get_frac_secs() < rhs.get_frac_secs())
));
}