diff options
Diffstat (limited to 'pjmedia/src/pjmedia/rtcp.c')
| -rw-r--r-- | pjmedia/src/pjmedia/rtcp.c | 432 |
1 files changed, 216 insertions, 216 deletions
diff --git a/pjmedia/src/pjmedia/rtcp.c b/pjmedia/src/pjmedia/rtcp.c index d606579d..70484388 100644 --- a/pjmedia/src/pjmedia/rtcp.c +++ b/pjmedia/src/pjmedia/rtcp.c @@ -1,216 +1,216 @@ -/* $Id$ */
-/*
- * Copyright (C) 2003-2006 Benny Prijono <benny@prijono.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
-#include <pjmedia/rtcp.h>
-#include <pj/os.h> /* pj_gettimeofday */
-#include <pj/sock.h> /* pj_htonx, pj_ntohx */
-#include <string.h> /* memset */
-
-#define RTCP_SR 200
-#define RTCP_RR 201
-
-
-
-/*
- * Get NTP time.
- */
-static void rtcp_get_ntp_time(struct pj_rtcp_ntp_rec *ntp)
-{
- pj_time_val tv;
-
- pj_gettimeofday(&tv);
-
- ntp->hi = tv.sec;
- tv.msec = tv.msec % 1000;
- ntp->lo = tv.msec * 0xFFFF / 1000;
- ntp->lo <<= 16;
-}
-
-
-PJ_DEF(void) pj_rtcp_init(pj_rtcp_session *s, pj_uint32_t ssrc)
-{
- pj_rtcp_pkt *rtcp_pkt = &s->rtcp_pkt;
-
- memset(rtcp_pkt, 0, sizeof(pj_rtcp_pkt));
-
- /* Init time */
- s->rtcp_lsr.hi = s->rtcp_lsr.lo = 0;
- s->rtcp_lsr_time = 0;
-
- /* Init common RTCP header */
- rtcp_pkt->common.version = 2;
- rtcp_pkt->common.count = 1;
- rtcp_pkt->common.pt = RTCP_SR;
- rtcp_pkt->common.length = pj_htons(12);
-
- /* Init SR */
- rtcp_pkt->sr.ssrc = pj_htonl(ssrc);
-
- /* RR will be initialized on receipt of the first RTP packet. */
-}
-
-PJ_DEF(void) pj_rtcp_fini(pj_rtcp_session *session)
-{
- /* Nothing to do. */
- PJ_UNUSED_ARG(session)
-}
-
-static void rtcp_init_seq(pj_rtcp_session *s, pj_uint16_t seq)
-{
- s->received = 0;
- s->expected_prior = 0;
- s->received_prior = 0;
- s->transit = 0;
- s->jitter = 0;
-
- pj_rtp_seq_restart(&s->seq_ctrl, seq);
-}
-
-PJ_DEF(void) pj_rtcp_rx_rtp(pj_rtcp_session *s, pj_uint16_t seq, pj_uint32_t rtp_ts)
-{
- pj_uint32_t arrival;
- pj_int32_t transit;
- unsigned long timer_tick;
- pj_time_val tv;
- int status;
-
- /* Update sequence numbers (received, lost, etc). */
- status = pj_rtp_seq_update(&s->seq_ctrl, seq);
- if (status == PJ_RTP_ERR_SESSION_RESTARTED) {
- rtcp_init_seq(s, seq);
- status = 0;
- }
-
- if (status != 0)
- return;
-
- ++s->received;
-
- pj_gettimeofday(&tv);
- timer_tick = tv.sec * 1000 + tv.msec;
-
- /*
- * Calculate jitter (s->jitter is in timer tick unit)
- */
- PJ_TODO(SUPPORT_JITTER_CALCULATION_FOR_NON_8KHZ_SAMPLE_RATE)
-
- arrival = timer_tick << 3; // 8 samples per ms.
- transit = arrival - rtp_ts;
-
- if (s->transit == 0) {
- s->transit = transit;
- } else {
- pj_int32_t d, jitter = s->jitter;
-
- d = transit - s->transit;
- s->transit = transit;
- if (d < 0)
- d = -d;
-
- jitter += d - ((jitter + 8) >> 4);
- s->jitter = jitter;
- }
-}
-
-PJ_DEF(void) pj_rtcp_tx_rtp(pj_rtcp_session *s, pj_uint16_t bytes_payload_size)
-{
- pj_rtcp_pkt *rtcp_pkt = &s->rtcp_pkt;
- rtcp_pkt->sr.sender_pcount = pj_htonl( pj_ntohl(rtcp_pkt->sr.sender_pcount) + 1);
- rtcp_pkt->sr.sender_bcount = pj_htonl( pj_ntohl(rtcp_pkt->sr.sender_bcount) + bytes_payload_size );
-}
-
-static void rtcp_build_rtcp(pj_rtcp_session *s, pj_uint32_t receiver_ssrc)
-{
- pj_uint32_t expected;
- pj_uint32_t u32;
- pj_uint32_t expected_interval, received_interval, lost_interval;
- pj_rtcp_pkt *rtcp_pkt = &s->rtcp_pkt;
-
- /* SSRC and last_seq */
- rtcp_pkt->rr.ssrc = pj_htonl(receiver_ssrc);
- rtcp_pkt->rr.last_seq = (s->seq_ctrl.cycles & 0xFFFF0000L);
- rtcp_pkt->rr.last_seq += s->seq_ctrl.max_seq;
- rtcp_pkt->rr.last_seq = pj_htonl(rtcp_pkt->rr.last_seq);
-
- /* Jitter */
- rtcp_pkt->rr.jitter = pj_htonl(s->jitter >> 4);
-
- /* Total lost. */
- expected = pj_ntohl(rtcp_pkt->rr.last_seq) - s->seq_ctrl.base_seq + 1;
- u32 = expected - s->received;
- rtcp_pkt->rr.total_lost_2 = (u32 >> 16) & 0x00FF;
- rtcp_pkt->rr.total_lost_1 = (u32 >> 8) & 0x00FF;
- rtcp_pkt->rr.total_lost_0 = u32 & 0x00FF;
-
- /* Fraction lost calculation */
- expected_interval = expected - s->expected_prior;
- s->expected_prior = expected;
-
- received_interval = s->received - s->received_prior;
- s->received_prior = s->received;
-
- lost_interval = expected_interval - received_interval;
-
- if (expected_interval==0 || lost_interval == 0) {
- rtcp_pkt->rr.fract_lost = 0;
- } else {
- rtcp_pkt->rr.fract_lost = (lost_interval << 8) / expected_interval;
- }
-}
-
-PJ_DEF(void) pj_rtcp_build_rtcp(pj_rtcp_session *session, pj_rtcp_pkt **ret_p_pkt, int *len)
-{
- pj_rtcp_pkt *rtcp_pkt = &session->rtcp_pkt;
- pj_rtcp_ntp_rec ntp;
- pj_time_val now;
-
- rtcp_build_rtcp(session, session->peer_ssrc);
-
- /* Get current NTP time. */
- rtcp_get_ntp_time(&ntp);
-
- /* Fill in NTP timestamp in SR. */
- rtcp_pkt->sr.ntp_sec = pj_htonl(ntp.hi);
- rtcp_pkt->sr.ntp_frac = pj_htonl(ntp.lo);
-
- if (session->rtcp_lsr_time == 0 || session->rtcp_lsr.lo == 0) {
- rtcp_pkt->rr.lsr = 0;
- rtcp_pkt->rr.dlsr = 0;
- } else {
- unsigned msec_elapsed;
-
- /* Fill in LSR.
- LSR is the middle 32bit of the last SR NTP time received.
- */
- rtcp_pkt->rr.lsr = ((session->rtcp_lsr.hi & 0x0000FFFF) << 16) |
- ((session->rtcp_lsr.lo >> 16) & 0xFFFF);
- rtcp_pkt->rr.lsr = pj_htonl(rtcp_pkt->rr.lsr);
-
- /* Fill in DLSR.
- DLSR is Delay since Last SR, in 1/65536 seconds.
- */
- pj_gettimeofday(&now);
- msec_elapsed = (now.msec - session->rtcp_lsr_time);
- rtcp_pkt->rr.dlsr = pj_htonl((msec_elapsed * 65536) / 1000);
- }
-
- /* Return pointer. */
- *ret_p_pkt = rtcp_pkt;
- *len = sizeof(pj_rtcp_pkt);
-}
-
+/* $Id$ */ +/* + * Copyright (C) 2003-2006 Benny Prijono <benny@prijono.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ +#include <pjmedia/rtcp.h> +#include <pj/os.h> /* pj_gettimeofday */ +#include <pj/sock.h> /* pj_htonx, pj_ntohx */ +#include <string.h> /* memset */ + +#define RTCP_SR 200 +#define RTCP_RR 201 + + + +/* + * Get NTP time. + */ +static void rtcp_get_ntp_time(struct pj_rtcp_ntp_rec *ntp) +{ + pj_time_val tv; + + pj_gettimeofday(&tv); + + ntp->hi = tv.sec; + tv.msec = tv.msec % 1000; + ntp->lo = tv.msec * 0xFFFF / 1000; + ntp->lo <<= 16; +} + + +PJ_DEF(void) pj_rtcp_init(pj_rtcp_session *s, pj_uint32_t ssrc) +{ + pj_rtcp_pkt *rtcp_pkt = &s->rtcp_pkt; + + memset(rtcp_pkt, 0, sizeof(pj_rtcp_pkt)); + + /* Init time */ + s->rtcp_lsr.hi = s->rtcp_lsr.lo = 0; + s->rtcp_lsr_time = 0; + + /* Init common RTCP header */ + rtcp_pkt->common.version = 2; + rtcp_pkt->common.count = 1; + rtcp_pkt->common.pt = RTCP_SR; + rtcp_pkt->common.length = pj_htons(12); + + /* Init SR */ + rtcp_pkt->sr.ssrc = pj_htonl(ssrc); + + /* RR will be initialized on receipt of the first RTP packet. */ +} + +PJ_DEF(void) pj_rtcp_fini(pj_rtcp_session *session) +{ + /* Nothing to do. */ + PJ_UNUSED_ARG(session) +} + +static void rtcp_init_seq(pj_rtcp_session *s, pj_uint16_t seq) +{ + s->received = 0; + s->expected_prior = 0; + s->received_prior = 0; + s->transit = 0; + s->jitter = 0; + + pj_rtp_seq_restart(&s->seq_ctrl, seq); +} + +PJ_DEF(void) pj_rtcp_rx_rtp(pj_rtcp_session *s, pj_uint16_t seq, pj_uint32_t rtp_ts) +{ + pj_uint32_t arrival; + pj_int32_t transit; + unsigned long timer_tick; + pj_time_val tv; + int status; + + /* Update sequence numbers (received, lost, etc). */ + status = pj_rtp_seq_update(&s->seq_ctrl, seq); + if (status == PJ_RTP_ERR_SESSION_RESTARTED) { + rtcp_init_seq(s, seq); + status = 0; + } + + if (status != 0) + return; + + ++s->received; + + pj_gettimeofday(&tv); + timer_tick = tv.sec * 1000 + tv.msec; + + /* + * Calculate jitter (s->jitter is in timer tick unit) + */ + PJ_TODO(SUPPORT_JITTER_CALCULATION_FOR_NON_8KHZ_SAMPLE_RATE) + + arrival = timer_tick << 3; // 8 samples per ms. + transit = arrival - rtp_ts; + + if (s->transit == 0) { + s->transit = transit; + } else { + pj_int32_t d, jitter = s->jitter; + + d = transit - s->transit; + s->transit = transit; + if (d < 0) + d = -d; + + jitter += d - ((jitter + 8) >> 4); + s->jitter = jitter; + } +} + +PJ_DEF(void) pj_rtcp_tx_rtp(pj_rtcp_session *s, pj_uint16_t bytes_payload_size) +{ + pj_rtcp_pkt *rtcp_pkt = &s->rtcp_pkt; + rtcp_pkt->sr.sender_pcount = pj_htonl( pj_ntohl(rtcp_pkt->sr.sender_pcount) + 1); + rtcp_pkt->sr.sender_bcount = pj_htonl( pj_ntohl(rtcp_pkt->sr.sender_bcount) + bytes_payload_size ); +} + +static void rtcp_build_rtcp(pj_rtcp_session *s, pj_uint32_t receiver_ssrc) +{ + pj_uint32_t expected; + pj_uint32_t u32; + pj_uint32_t expected_interval, received_interval, lost_interval; + pj_rtcp_pkt *rtcp_pkt = &s->rtcp_pkt; + + /* SSRC and last_seq */ + rtcp_pkt->rr.ssrc = pj_htonl(receiver_ssrc); + rtcp_pkt->rr.last_seq = (s->seq_ctrl.cycles & 0xFFFF0000L); + rtcp_pkt->rr.last_seq += s->seq_ctrl.max_seq; + rtcp_pkt->rr.last_seq = pj_htonl(rtcp_pkt->rr.last_seq); + + /* Jitter */ + rtcp_pkt->rr.jitter = pj_htonl(s->jitter >> 4); + + /* Total lost. */ + expected = pj_ntohl(rtcp_pkt->rr.last_seq) - s->seq_ctrl.base_seq + 1; + u32 = expected - s->received; + rtcp_pkt->rr.total_lost_2 = (u32 >> 16) & 0x00FF; + rtcp_pkt->rr.total_lost_1 = (u32 >> 8) & 0x00FF; + rtcp_pkt->rr.total_lost_0 = u32 & 0x00FF; + + /* Fraction lost calculation */ + expected_interval = expected - s->expected_prior; + s->expected_prior = expected; + + received_interval = s->received - s->received_prior; + s->received_prior = s->received; + + lost_interval = expected_interval - received_interval; + + if (expected_interval==0 || lost_interval == 0) { + rtcp_pkt->rr.fract_lost = 0; + } else { + rtcp_pkt->rr.fract_lost = (lost_interval << 8) / expected_interval; + } +} + +PJ_DEF(void) pj_rtcp_build_rtcp(pj_rtcp_session *session, pj_rtcp_pkt **ret_p_pkt, int *len) +{ + pj_rtcp_pkt *rtcp_pkt = &session->rtcp_pkt; + pj_rtcp_ntp_rec ntp; + pj_time_val now; + + rtcp_build_rtcp(session, session->peer_ssrc); + + /* Get current NTP time. */ + rtcp_get_ntp_time(&ntp); + + /* Fill in NTP timestamp in SR. */ + rtcp_pkt->sr.ntp_sec = pj_htonl(ntp.hi); + rtcp_pkt->sr.ntp_frac = pj_htonl(ntp.lo); + + if (session->rtcp_lsr_time == 0 || session->rtcp_lsr.lo == 0) { + rtcp_pkt->rr.lsr = 0; + rtcp_pkt->rr.dlsr = 0; + } else { + unsigned msec_elapsed; + + /* Fill in LSR. + LSR is the middle 32bit of the last SR NTP time received. + */ + rtcp_pkt->rr.lsr = ((session->rtcp_lsr.hi & 0x0000FFFF) << 16) | + ((session->rtcp_lsr.lo >> 16) & 0xFFFF); + rtcp_pkt->rr.lsr = pj_htonl(rtcp_pkt->rr.lsr); + + /* Fill in DLSR. + DLSR is Delay since Last SR, in 1/65536 seconds. + */ + pj_gettimeofday(&now); + msec_elapsed = (now.msec - session->rtcp_lsr_time); + rtcp_pkt->rr.dlsr = pj_htonl((msec_elapsed * 65536) / 1000); + } + + /* Return pointer. */ + *ret_p_pkt = rtcp_pkt; + *len = sizeof(pj_rtcp_pkt); +} + |