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libcamera: utils: Add helper class for std::chrono::duration

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A new utils::Duration class is defined to represent a std::chrono::duration type
with double precision nanosecond timebase. Using a double minimises the loss of
precision when converting timebases. This helper class may be used by IPAs to
represent variables such as frame durations and exposure times.

An operator << overload is defined to help with displaying utils::Duration value
in stream objects. Currently, this will display the duration value in
microseconds.

Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
This commit is contained in:
Naushir Patuck
2021-06-08 12:03:32 +01:00
committed by Laurent Pinchart
parent 75c1490827
commit 5055ca747c
3 changed files with 135 additions and 0 deletions
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include/libcamera/internal/utils.h
+32
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@@ -316,8 +316,40 @@ auto enumerate(T (&iterable)[N]) -> details::enumerate_adapter<T *>
}
#endif
class Duration : public std::chrono::duration<double, std::nano>
{
using BaseDuration = std::chrono::duration<double, std::nano>;
public:
Duration() = default;
template<typename Rep, typename Period>
constexpr Duration(const std::chrono::duration<Rep, Period> &d)
: BaseDuration(d)
{
}
template<typename Period>
double get() const
{
auto const c = std::chrono::duration_cast<std::chrono::duration<double, Period>>(*this);
return c.count();
}
explicit constexpr operator bool() const
{
return *this != BaseDuration::zero();
}
};
} /* namespace utils */
#ifndef __DOXYGEN__
template<class CharT, class Traits>
std::basic_ostream<CharT, Traits> &operator<<(std::basic_ostream<CharT, Traits> &os,
const utils::Duration &d);
#endif
} /* namespace libcamera */
#endif /* __LIBCAMERA_INTERNAL_UTILS_H__ */