diff options
| author | Naushir Patuck <naush@raspberrypi.com> | 2021-06-08 12:03:32 +0100 |
|---|---|---|
| committer | Laurent Pinchart <laurent.pinchart@ideasonboard.com> | 2021-06-08 23:56:03 +0300 |
| commit | 5055ca747c4c0d635ed8f2ab272f493748c2f50a (patch) | |
| tree | 66c5b36389a5d0f4bfe07f2edf5bf4877c413d30 /include | |
| parent | 75c14908271d44edac3b7c8d0f94501a3c93477e (diff) | |
libcamera: utils: Add helper class for std::chrono::duration
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>
Diffstat (limited to 'include')
| -rw-r--r-- | include/libcamera/internal/utils.h | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/include/libcamera/internal/utils.h b/include/libcamera/internal/utils.h index 83dada7c..15beb0f4 100644 --- a/include/libcamera/internal/utils.h +++ b/include/libcamera/internal/utils.h @@ -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__ */ |