[FFmpeg-devel] [PATCH v3 2/4] avutil/timer: Add clock_gettime as a fallback of AV_READ_TIME

[Zhao Zhili <quinkblack@foxmail.com>]

From: Zhao Zhili <zhilizhao@tencent.com>

---
v3: add ff_read_time() rather than use av_gettime_relative() to get
nanosecond precision.

 libavutil/timer.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/libavutil/timer.h b/libavutil/timer.h
index 2cd299eca3..3e5d5ef23f 100644
--- a/libavutil/timer.h
+++ b/libavutil/timer.h
@@ -46,6 +46,8 @@
 #include "macos_kperf.h"
 #elif HAVE_MACH_ABSOLUTE_TIME
 #include <mach/mach_time.h>
+#elif HAVE_CLOCK_GETTIME
+#include <time.h>
 #endif
 
 #include "common.h"
@@ -70,6 +72,14 @@
 #       define AV_READ_TIME gethrtime
 #   elif HAVE_MACH_ABSOLUTE_TIME
 #       define AV_READ_TIME mach_absolute_time
+#   elif HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC)
+        static inline int64_t ff_read_time(void)
+        {
+            struct timespec ts;
+            clock_gettime(CLOCK_MONOTONIC, &ts);
+            return (int64_t) ts.tv_sec * 1000000000 + ts.tv_nsec;
+        }
+#       define AV_READ_TIME ff_read_time
 #   endif
 #endif
 
-- 
2.42.0

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