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avformat/rtpdec: attach producer reference time if available

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This produces true wallclock time at rtp source instead of the
local wallclock time at rtp client.

Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
Alok Priyadarshi 2021-03-23 14:29:48 -07:00 committed by James Almer
parent 3220a908ca
commit adff25412a
3 changed files with 36 additions and 0 deletions
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8
libavformat/internal.h
View File

@ -423,6 +423,14 @@ 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.

19
libavformat/rtpdec.c
View File

@ -622,6 +622,19 @@ void ff_rtp_parse_set_crypto(RTPDemuxContext *s, const char *suite,
s->srtp_enabled = 1;
}
static int rtp_set_prft(RTPDemuxContext *s, AVPacket *pkt, uint32_t timestamp) {
AVProducerReferenceTime *prft =
(AVProducerReferenceTime *) av_packet_new_side_data(
pkt, AV_PKT_DATA_PRFT, sizeof(AVProducerReferenceTime));
if (!prft)
return AVERROR(ENOMEM);
prft->wallclock = ff_parse_ntp_time(s->last_rtcp_ntp_time) - NTP_OFFSET_US +
timestamp - s->last_rtcp_timestamp;
prft->flags = 24;
return 0;
}
/**
* This was the second switch in rtp_parse packet.
* Normalizes time, if required, sets stream_index, etc.
@ -633,6 +646,12 @@ 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) {
if (rtp_set_prft(s, pkt, timestamp) < 0) {
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;

9
libavformat/utils.c
View File

@ -4706,6 +4706,15 @@ 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;