[vlc-devel] [PATCH 3/6] vlc_tick: add helper macros to convert microseconds to/from vlc_tick_t
Steve Lhomme
robux4 at ycbcr.xyz
Fri Jun 22 18:17:41 CEST 2018
---
include/vlc_tick.h | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/include/vlc_tick.h b/include/vlc_tick.h
index 7236b98d9d3..d318a0c8a4b 100644
--- a/include/vlc_tick.h
+++ b/include/vlc_tick.h
@@ -113,6 +113,21 @@ static inline double secf_from_vlc_tick(vlc_tick_t vtk)
#endif /* CLOCK_FREQ / 1000 */
+/*
+ * vlc_tick_t <> microseconds (us) conversions
+ */
+#if (CLOCK_FREQ % 1000000) == 0
+#define VLC_TICK_FROM_US(us) ((CLOCK_FREQ / INT64_C(1000000)) * (us))
+#define US_FROM_VLC_TICK(vtk) ((vtk) / (CLOCK_FREQ / INT64_C(1000000)))
+#elif (1000000 % CLOCK_FREQ) == 0
+#define VLC_TICK_FROM_US(us) ((us) / (INT64_C(1000000) / CLOCK_FREQ))
+#define US_FROM_VLC_TICK(vtk) ((vtk) * (INT64_C(1000000) / CLOCK_FREQ))
+#else /* rounded overflowing conversion */
+#define VLC_TICK_FROM_US(us) (CLOCK_FREQ * (us) / INT64_C(1000000))
+#define US_FROM_VLC_TICK(vtk) ((vtk) * INT64_C(1000000) / CLOCK_FREQ)
+#endif /* CLOCK_FREQ / 1000000 */
+
+
/*****************************************************************************
* MSTRTIME_MAX_SIZE: maximum possible size of mstrtime
*****************************************************************************
--
2.17.0
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