@@ -240,6 +240,14 @@ void ff_read_frame_flush(AVFormatContext *s);
uint64_t ff_ntp_time(void);
/**
+ * Get the NTP time stamp formatted as per the RFC-5905.
+ *
+ * @param ntp_time NTP time in micro seconds (since NTP epoch)
+ * @return the formatted NTP time stamp
+ */
+uint64_t ff_get_formatted_ntp_time(uint64_t ntp_time_us);
+
+/**
* Append the media-specific SDP fragment for the media stream c
* to the buffer buff.
*
@@ -4637,6 +4637,28 @@ uint64_t ff_ntp_time(void)
return (av_gettime() / 1000) * 1000 + NTP_OFFSET_US;
}
+uint64_t ff_get_formatted_ntp_time(uint64_t ntp_time_us)
+{
+ uint64_t ntp_ts, frac_part, sec;
+ uint32_t usec;
+
+ //current ntp time in seconds and micro seconds
+ sec = ntp_time_us / 1000000;
+ usec = ntp_time_us % 1000000;
+
+ //encoding in ntp timestamp format
+ frac_part = usec * 0xFFFFFFFFULL;
+ frac_part /= 1000000;
+
+ if (sec > 0xFFFFFFFFULL)
+ av_log(NULL, AV_LOG_WARNING, "NTP time format roll over detected\n");
+
+ ntp_ts = sec << 32;
+ ntp_ts |= frac_part;
+
+ return ntp_ts;
+}
+
int av_get_frame_filename2(char *buf, int buf_size, const char *path, int number, int flags)
{
const char *p;
From: Vishwanath Dixit <vdixit@akamai.com> This utility function creates 64-bit NTP time format as per the RFC 5905. A simple explaination of 64-bit NTP time format is here http://www.beaglesoft.com/Manual/page53.htm --- libavformat/internal.h | 8 ++++++++ libavformat/utils.c | 22 ++++++++++++++++++++++ 2 files changed, 30 insertions(+)