Make the ntp_time function available to other parts of libavformat, as ff_ntp_time

Originally committed as revision 22438 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/utils.c

@@ -3073,6 +3073,14 @@ int64_t av_gettime(void)
     return (int64_t)tv.tv_sec * 1000000 + tv.tv_usec;
 }
 
+#define NTP_OFFSET 2208988800ULL
+#define NTP_OFFSET_US (NTP_OFFSET * 1000000ULL)
+
+uint64_t ff_ntp_time(void)
+{
+  return (av_gettime() / 1000) * 1000 + NTP_OFFSET_US;
+}
+
 int64_t parse_date(const char *datestr, int duration)
 {
     const char *p;