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FS-8534: calculate RTT average (RTCP SR)

This commit is contained in:
Dragos Oancea 2015-11-12 06:20:57 -05:00
parent cf2528dbc3
commit cc1bf31078
2 changed files with 20 additions and 17 deletions
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1
src/include/switch_rtcp_frame.h
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@ -51,6 +51,7 @@ struct switch_rtcp_report_block_frame {
uint32_t lsr; /* The middle 32 bits out of 64 in the NTP timestamp */
uint32_t dlsr; /* The delay, expressed in units of 1/65536 seconds, between receiving the last SR packet from source SSRC_n and sending this reception report block */
uint32_t loss_avg;
double rtt_avg;
};
/*! \brief An abstraction of a rtcp frame */

36
src/switch_rtp.c
View File

@ -5770,7 +5770,6 @@ static switch_status_t process_rtcp_report(switch_rtp_t *rtp_session, rtcp_msg_t
} else
if (msg->header.type == _RTCP_PT_SR || msg->header.type == _RTCP_PT_RR) {
struct switch_rtcp_report_block *report_block;
switch_time_t now;
switch_time_exp_t now_hr;
uint32_t sec, ntp_sec, ntp_usec, lsr_now;
@ -5786,7 +5785,6 @@ static switch_status_t process_rtcp_report(switch_rtp_t *rtp_session, rtcp_msg_t
if (msg->header.type == _RTCP_PT_SR) { /* Sender report */
struct switch_rtcp_sender_report* sr = (struct switch_rtcp_sender_report*)msg->body;
report_block = &sr->report_block;
rtp_session->stats.rtcp.packet_count += ntohl(sr->sender_info.pc);
rtp_session->stats.rtcp.octet_count += ntohl(sr->sender_info.oc);
packet_ssrc = sr->ssrc;
@ -5842,32 +5840,36 @@ static switch_status_t process_rtcp_report(switch_rtp_t *rtp_session, rtcp_msg_t
rtp_session->rtcp_frame.reports[i].jitter = ntohl(report->jitter);
rtp_session->rtcp_frame.reports[i].lsr = ntohl(report->lsr);
rtp_session->rtcp_frame.reports[i].dlsr = ntohl(report->dlsr);
if (rtp_session->rtcp_frame.reports[i].lsr && !rtp_session->flags[SWITCH_RTP_FLAG_RTCP_PASSTHRU]) {
double rtt_now;
switch_time_exp_gmt(&now_hr,now);
/* Calculating RTT = A - DLSR - LSR */
rtt_now = (double)(lsr_now - rtp_session->rtcp_frame.reports[i].dlsr - rtp_session->rtcp_frame.reports[i].lsr)/65536;
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(rtp_session->session), SWITCH_LOG_DEBUG3,
"Receiving an RTCP packet\n[%04d-%02d-%02d %02d:%02d:%02d.%d] SSRC[0x%x]\n"
"RTT[%f] = A[%u] - DLSR[%u] - LSR[%u]\n",
1900 + now_hr.tm_year, now_hr.tm_mday, now_hr.tm_mon, now_hr.tm_hour, now_hr.tm_min, now_hr.tm_sec, now_hr.tm_usec,
rtp_session->rtcp_frame.reports[i].ssrc, rtt_now,
lsr_now, rtp_session->rtcp_frame.reports[i].dlsr, rtp_session->rtcp_frame.reports[i].lsr);
if (!rtp_session->rtcp_frame.reports[i].rtt_avg) {
rtp_session->rtcp_frame.reports[i].rtt_avg = rtt_now;
} else {
rtp_session->rtcp_frame.reports[i].rtt_avg = (double)((rtp_session->rtcp_frame.reports[i].rtt_avg * .7) + (rtt_now * .3 ));
}
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(rtp_session->session), SWITCH_LOG_DEBUG3, "RTT average %f\n",
rtp_session->rtcp_frame.reports[i].rtt_avg);
}
}
rtp_session->rtcp_frame.report_count = (uint16_t)i;
} else { /* Receiver report */
struct switch_rtcp_receiver_report* rr = (struct switch_rtcp_receiver_report*)msg->body;
report_block = &rr->report_block;
packet_ssrc = rr->ssrc;
memset(&rtp_session->rtcp_frame, 0, sizeof(rtp_session->rtcp_frame));
}
/* Currently in passthru mode RTT will not be accurate, some work as to be done (something like mapping the NTP timestamp with a local one) to have RTT from both legs */
if (report_block->lsr && !rtp_session->flags[SWITCH_RTP_FLAG_RTCP_PASSTHRU]) {
switch_time_exp_gmt(&now_hr,now);
/* Calculating RTT = A - DLSR - LSR */
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(rtp_session->session), SWITCH_LOG_DEBUG3,
"Receiving an RTCP packet\n[%04d-%02d-%02d %02d:%02d:%02d.%d] SSRC[%u]\n"
"RTT[%f] A[%u] - DLSR[%u] - LSR[%u]\n",
1900 + now_hr.tm_year, now_hr.tm_mday, now_hr.tm_mon, now_hr.tm_hour, now_hr.tm_min, now_hr.tm_sec, now_hr.tm_usec,
ntohl(packet_ssrc), (double)(lsr_now - ntohl(report_block->dlsr) - ntohl(report_block->lsr))/65536,
lsr_now, ntohl(report_block->dlsr), ntohl(report_block->lsr));
}
rtp_session->rtcp_fresh_frame = 1;
rtp_session->stats.rtcp.peer_ssrc = ntohl(packet_ssrc);
}