On 3/17/2021 9:28 PM, Alok Priyadarshi wrote:
This produces true wallclock time at rtp source instead of the
local wallclock time at rtp client.
---
libavformat/internal.h | 8 ++++++++
libavformat/rtpdec.c | 10 ++++++++++
libavformat/utils.c | 9 +++++++++
3 files changed, 27 insertions(+)
diff --git a/libavformat/internal.h b/libavformat/internal.h
index 17a6ab07d3..1e10cde00e 100644
--- a/libavformat/internal.h
+++ b/libavformat/internal.h
@@ -254,6 +254,14 @@ uint64_t ff_ntp_time(void);
*/
uint64_t ff_get_formatted_ntp_time(uint64_t ntp_time_us);
+/**
+ * Parse the NTP time in micro seconds (since NTP epoch).
+ *
+ * @param ntp_ts NTP time stamp formatted as per the RFC-5905.
+ * @return the time in micro seconds (since NTP epoch)
+ */
+uint64_t ff_parse_ntp_time(uint64_t ntp_ts);
+
/**
* Append the media-specific SDP fragment for the media stream c
* to the buffer buff.
diff --git a/libavformat/rtpdec.c b/libavformat/rtpdec.c
index 3d5b200099..3e5f280f2f 100644
--- a/libavformat/rtpdec.c
+++ b/libavformat/rtpdec.c
@@ -23,6 +23,7 @@
#include "libavutil/avstring.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/time.h"
+#include "libavcodec/packet_internal.h"
#include "avformat.h"
#include "network.h"
@@ -30,6 +31,7 @@
#include "url.h"
#include "rtpdec.h"
#include "rtpdec_formats.h"
+#include "internal.h"
#define MIN_FEEDBACK_INTERVAL 200000 /* 200 ms in us */
@@ -594,6 +596,14 @@ static void finalize_packet(RTPDemuxContext *s, AVPacket *pkt, uint32_t timestam
if (timestamp == RTP_NOTS_VALUE)
return;
+ if (s->last_rtcp_ntp_time != AV_NOPTS_VALUE) {
+ uint64_t prft_us = ff_parse_ntp_time(s->last_rtcp_ntp_time) -
NTP_OFFSET_US +
+ timestamp - s->last_rtcp_timestamp;
+ if (ff_side_data_set_prft(pkt, prft_us) < 0) {
This is a libavcodec function. It can't be used from libavformat. You
should instead manually add the side data using
av_packet_new_side_data(pkt, AV_PKT_DATA_PRFT,
sizeof(AVProducerReferenceTime)), then filling both the struct's
wallclock and flags fields following the definition in the struct's doxy
and ISO/IEC 14496-12, so flags should probably be 24.
That being said, what is expected to use this value? Decoders don't care
about prft, so is your usecase a remuxing one?
+ av_log(s->ic, AV_LOG_WARNING, "rtpdec: failed to set prft");
+ }
+ }
+
if (s->last_rtcp_ntp_time != AV_NOPTS_VALUE && s->ic->nb_streams > 1) {
int64_t addend;
int delta_timestamp;
diff --git a/libavformat/utils.c b/libavformat/utils.c
index 7e5767ec60..569922beaf 100644
--- a/libavformat/utils.c
+++ b/libavformat/utils.c
@@ -4734,6 +4734,15 @@ uint64_t ff_get_formatted_ntp_time(uint64_t ntp_time_us)
return ntp_ts;
}
+uint64_t ff_parse_ntp_time(uint64_t ntp_ts)
+{
+ uint64_t sec = ntp_ts >> 32;
+ uint64_t frac_part = ntp_ts & 0xFFFFFFFFULL;
+ uint64_t usec = (frac_part * 1000000) / 0xFFFFFFFFULL;
+
+ return (sec * 1000000) + usec;
+}
+
int av_get_frame_filename2(char *buf, int buf_size, const char *path, int
number, int flags)
{
const char *p;
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