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rtpsession: Only schedule a timer when we actually have to send RTCP

Browse source 
Otherwise we will have 10s-100s of thread wakeups in feedback profiles, create
RTCP packets, etc. just to suppress them in 99% of the cases (i.e. if no
feedback is actually pending and no regular RTCP has to be sent).

This improves CPU usage and battery life quite a lot.

https://bugzilla.gnome.org/show_bug.cgi?id=746543
This commit is contained in:
Sebastian Dröge 2015-05-26 14:47:31 +02:00
parent 8ada98964d
commit 647eefea67
2 changed files with 114 additions and 61 deletions
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150
gst/rtpmanager/rtpsession.c
View file

@ -574,8 +574,8 @@ rtp_session_init (RTPSession * sess)
sess->next_rtcp_check_time = GST_CLOCK_TIME_NONE;
sess->last_rtcp_check_time = GST_CLOCK_TIME_NONE;
sess->last_rtcp_send_time = GST_CLOCK_TIME_NONE;
sess->last_rtcp_interval = GST_CLOCK_TIME_NONE;
sess->allow_early = TRUE;
sess->next_early_rtcp_time = GST_CLOCK_TIME_NONE;
sess->rtcp_feedback_retention_window = DEFAULT_RTCP_FEEDBACK_RETENTION_WINDOW;
sess->rtcp_immediate_feedback_threshold =
@ -2326,15 +2326,31 @@ rtp_session_process_bye (RTPSession * sess, GstRTCPPacket * packet,
pinfo->current_time < sess->next_rtcp_check_time) {
GstClockTime time_remaining;
/* Scale our next RTCP check time according to the change of numbers
* of members. But only if a) this is the first RTCP, or b) this is not
* a feedback session, or c) this is a feedback session but we schedule
* for every RTCP interval (aka no t-rr-interval set).
*
* FIXME: a) and b) are not great as we will possibly go below Tmin
* for non-feedback profiles and in case of a) below
* Tmin/t-rr-interval in any case.
*/
if (sess->last_rtcp_send_time == GST_CLOCK_TIME_NONE ||
!(sess->rtp_profile == GST_RTP_PROFILE_AVPF
|| sess->rtp_profile == GST_RTP_PROFILE_SAVPF) ||
sess->next_rtcp_check_time - sess->last_rtcp_send_time ==
sess->last_rtcp_interval) {
time_remaining = sess->next_rtcp_check_time - pinfo->current_time;
sess->next_rtcp_check_time =
gst_util_uint64_scale (time_remaining, members, pmembers);
sess->next_rtcp_check_time += pinfo->current_time;
}
sess->last_rtcp_interval =
gst_util_uint64_scale (sess->last_rtcp_interval, members, pmembers);
GST_DEBUG ("reverse reconsideration %" GST_TIME_FORMAT,
GST_TIME_ARGS (sess->next_rtcp_check_time));
sess->next_rtcp_check_time += pinfo->current_time;
/* mark pending reconsider. We only want to signal the reconsideration
* once after we handled all the source in the bye packet */
reconsider = TRUE;
@ -2905,7 +2921,6 @@ rtp_session_schedule_bye_locked (RTPSession * sess, GstClockTime current_time)
INIT_AVG (sess->bye_stats.avg_rtcp_packet_size, 100);
sess->bye_stats.bye_members = 1;
sess->first_rtcp = TRUE;
sess->allow_early = TRUE;
/* reschedule transmission */
sess->last_rtcp_send_time = current_time;
@ -2916,6 +2931,7 @@ rtp_session_schedule_bye_locked (RTPSession * sess, GstClockTime current_time)
sess->next_rtcp_check_time = current_time + interval;
else
sess->next_rtcp_check_time = GST_CLOCK_TIME_NONE;
sess->last_rtcp_interval = interval;
GST_DEBUG ("Schedule BYE for %" GST_TIME_FORMAT ", %" GST_TIME_FORMAT,
GST_TIME_ARGS (interval), GST_TIME_ARGS (sess->next_rtcp_check_time));
@ -2996,16 +3012,36 @@ rtp_session_next_timeout (RTPSession * sess, GstClockTime current_time)
GST_DEBUG ("reconsider BYE, more than 50 sources");
/* reconsider BYE if members >= 50 */
interval = calculate_rtcp_interval (sess, FALSE, TRUE);
sess->last_rtcp_interval = interval;
}
} else {
if (sess->first_rtcp) {
GST_DEBUG ("first RTCP packet");
/* we are called for the first time */
interval = calculate_rtcp_interval (sess, FALSE, TRUE);
sess->last_rtcp_interval = interval;
} else if (sess->next_rtcp_check_time < current_time) {
GST_DEBUG ("old check time expired, getting new timeout");
/* get a new timeout when we need to */
interval = calculate_rtcp_interval (sess, FALSE, FALSE);
sess->last_rtcp_interval = interval;
if ((sess->rtp_profile == GST_RTP_PROFILE_AVPF
|| sess->rtp_profile == GST_RTP_PROFILE_SAVPF)
&& interval != GST_CLOCK_TIME_NONE) {
/* Apply the rules from RFC 4585 section 3.5.3 */
if (sess->stats.min_interval != 0) {
GstClockTime T_rr_current_interval = g_random_double_range (0.5,
1.5) * sess->stats.min_interval * GST_SECOND;
if (T_rr_current_interval > interval) {
GST_DEBUG ("Adjusting interval for t-rr-interval: %" GST_TIME_FORMAT
" > %" GST_TIME_FORMAT, GST_TIME_ARGS (T_rr_current_interval),
GST_TIME_ARGS (interval));
interval = T_rr_current_interval;
}
}
}
}
}
@ -3462,7 +3498,7 @@ session_sdes (RTPSession * sess, ReportData * data)
type = gst_rtcp_sdes_name_to_type (field);
/* Early packets are minimal and only include the CNAME */
if (data->may_suppress && type != GST_RTCP_SDES_CNAME)
if (data->is_early && type != GST_RTCP_SDES_CNAME)
continue;
if (type > GST_RTCP_SDES_END && type < GST_RTCP_SDES_PRIV) {
@ -3579,11 +3615,11 @@ is_rtcp_time (RTPSession * sess, GstClockTime current_time, ReportData * data)
GST_TIME_ARGS (new_send_time));
/* store new check time */
sess->next_rtcp_check_time = new_send_time;
sess->last_rtcp_interval = interval;
return FALSE;
}
sess->next_rtcp_check_time = current_time + interval;
}
sess->last_rtcp_interval = interval;
if ((sess->rtp_profile == GST_RTP_PROFILE_AVPF
|| sess->rtp_profile == GST_RTP_PROFILE_SAVPF)
&& interval != GST_CLOCK_TIME_NONE) {
@ -3592,23 +3628,20 @@ is_rtcp_time (RTPSession * sess, GstClockTime current_time, ReportData * data)
GstClockTime T_rr_current_interval =
g_random_double_range (0.5, 1.5) * stats->min_interval * GST_SECOND;
/* This will caused the RTCP to be suppressed if no FB packets are added */
if (sess->last_rtcp_send_time + T_rr_current_interval > new_send_time) {
GST_DEBUG ("RTCP packet could be suppressed min: %" GST_TIME_FORMAT
" last: %" GST_TIME_FORMAT
" + T_rr_current_interval: %" GST_TIME_FORMAT
" > new_send_time: %" GST_TIME_FORMAT,
GST_TIME_ARGS (stats->min_interval),
GST_TIME_ARGS (sess->last_rtcp_send_time),
GST_TIME_ARGS (T_rr_current_interval),
GST_TIME_ARGS (new_send_time));
data->may_suppress = TRUE;
if (T_rr_current_interval > interval) {
GST_DEBUG ("Adjusting interval for t-rr-interval: %" GST_TIME_FORMAT
" > %" GST_TIME_FORMAT, GST_TIME_ARGS (T_rr_current_interval),
GST_TIME_ARGS (interval));
interval = T_rr_current_interval;
}
}
}
sess->next_rtcp_check_time = current_time + interval;
}
GST_DEBUG ("can send RTCP now, next interval %" GST_TIME_FORMAT,
GST_TIME_ARGS (new_send_time));
GST_DEBUG ("can send RTCP now, next %" GST_TIME_FORMAT,
GST_TIME_ARGS (sess->next_rtcp_check_time));
return TRUE;
}
@ -3660,7 +3693,7 @@ generate_rtcp (const gchar * key, RTPSource * source, ReportData * data)
/* send BYE */
make_source_bye (sess, source, data);
is_bye = TRUE;
} else if (!data->may_suppress) {
} else if (!data->is_early) {
/* loop over all known sources and add report blocks. If we are early, we
* just make a minimal RTCP packet and skip this step */
g_hash_table_foreach (sess->ssrcs[sess->mask_idx],
@ -3738,7 +3771,6 @@ rtp_session_on_timeout (RTPSession * sess, GstClockTime current_time,
ReportData data = { GST_RTCP_BUFFER_INIT };
GHashTable *table_copy;
ReportOutput *output;
gboolean must_not_suppress;
g_return_val_if_fail (RTP_IS_SESSION (sess), GST_FLOW_ERROR);
@ -3797,9 +3829,6 @@ rtp_session_on_timeout (RTPSession * sess, GstClockTime current_time,
if (!is_rtcp_time (sess, current_time, &data))
goto done;
/* We need to send a full RTCP packet */
must_not_suppress = !data.is_early && !data.may_suppress;
GST_DEBUG
("doing RTCP generation %u for %u sources, early %d, may suppress %d",
sess->generation, data.num_to_report, data.is_early, data.may_suppress);
@ -3814,19 +3843,24 @@ rtp_session_on_timeout (RTPSession * sess, GstClockTime current_time,
/* we keep track of the last report time in order to timeout inactive
* receivers or senders */
if (must_not_suppress)
if (!data.is_early) {
GST_DEBUG ("Time since last regular RTCP: %" GST_TIME_FORMAT " - %"
GST_TIME_FORMAT " = %" GST_TIME_FORMAT,
GST_TIME_ARGS (data.current_time),
GST_TIME_ARGS (sess->last_rtcp_send_time),
GST_TIME_ARGS (data.current_time - sess->last_rtcp_send_time));
sess->last_rtcp_send_time = data.current_time;
}
GST_DEBUG ("Time since last RTCP: %" GST_TIME_FORMAT " - %" GST_TIME_FORMAT
" = %" GST_TIME_FORMAT, GST_TIME_ARGS (data.current_time),
GST_TIME_ARGS (sess->last_rtcp_send_time),
GST_TIME_ARGS (data.current_time - sess->last_rtcp_check_time));
sess->last_rtcp_check_time = data.current_time;
sess->first_rtcp = FALSE;
sess->next_early_rtcp_time = GST_CLOCK_TIME_NONE;
sess->scheduled_bye = FALSE;
/* RFC 4585 section 3.5.2 step 6 */
if (!data.is_early) {
sess->allow_early = TRUE;
}
done:
RTP_SESSION_UNLOCK (sess);
@ -3854,8 +3888,8 @@ done:
sess->stats.nacks_sent += data.nacked_seqnums;
} else {
GST_DEBUG ("freeing packet callback: %p"
" do_not_suppress: %d may_suppress: %d",
sess->callbacks.send_rtcp, do_not_suppress, data.may_suppress);
" do_not_suppress: %d may_suppress: %d", sess->callbacks.send_rtcp,
do_not_suppress, data.may_suppress);
sess->stats.nacks_dropped += data.nacked_seqnums;
gst_buffer_unref (buffer);
}
@ -3879,8 +3913,9 @@ gboolean
rtp_session_request_early_rtcp (RTPSession * sess, GstClockTime current_time,
GstClockTime max_delay)
{
GstClockTime T_dither_max, T_rr;
GstClockTime T_dither_max, T_rr, offset = 0;
gboolean ret;
gboolean allow_early;
/* Implements the algorithm described in RFC 4585 section 3.5.2 */
@ -3930,7 +3965,7 @@ rtp_session_request_early_rtcp (RTPSession * sess, GstClockTime current_time,
goto end;
}
T_rr = sess->next_rtcp_check_time - sess->last_rtcp_check_time;
T_rr = sess->last_rtcp_interval;
/* RFC 4585 section 3.5.2 step 2b */
/* If the total sources is <=2, then there is only us and one peer */
@ -3948,16 +3983,41 @@ rtp_session_request_early_rtcp (RTPSession * sess, GstClockTime current_time,
/* RFC 4585 section 3.5.2 step 3 */
if (current_time + T_dither_max > sess->next_rtcp_check_time) {
GST_LOG_OBJECT (sess,
"don't send because of dither, next scheduled time is soon %"
"don't send because of dither, next scheduled time is too soon %"
GST_TIME_FORMAT " + %" GST_TIME_FORMAT " > %" GST_TIME_FORMAT,
GST_TIME_ARGS (current_time), GST_TIME_ARGS (T_dither_max),
GST_TIME_ARGS (sess->next_rtcp_check_time));
ret = TRUE;
ret = T_dither_max <= max_delay;
goto end;
}
/* RFC 4585 section 3.5.2 step 4a */
if (!sess->allow_early) {
/* RFC 4585 section 3.5.2 step 4a and
* RFC 4585 section 3.5.2 step 6 */
allow_early = FALSE;
if (sess->last_rtcp_check_time == sess->last_rtcp_send_time) {
/* Last time we sent a full RTCP packet, we can now immediately
* send an early one as allow_early was reset to TRUE */
allow_early = TRUE;
} else if (sess->last_rtcp_check_time + T_rr <= current_time + max_delay) {
/* Last packet we sent was an early RTCP packet and more than
* T_rr has passed since then, meaning we would have suppressed
* a regular RTCP packet already and reset allow_early to TRUE */
allow_early = TRUE;
/* We have to offset a bit as T_rr has not passed yet, but will before
* max_delay */
if (sess->last_rtcp_check_time + T_rr > current_time)
offset = (sess->last_rtcp_check_time + T_rr) - current_time;
} else {
GST_DEBUG_OBJECT (sess,
"can't allow early RTCP yet: last regular %" GST_TIME_FORMAT ", %"
GST_TIME_FORMAT " + %" GST_TIME_FORMAT " > %" GST_TIME_FORMAT " + %"
GST_TIME_FORMAT, GST_TIME_ARGS (sess->last_rtcp_send_time),
GST_TIME_ARGS (sess->last_rtcp_check_time), GST_TIME_ARGS (T_rr),
GST_TIME_ARGS (current_time), GST_TIME_ARGS (max_delay));
}
if (!allow_early) {
/* Ignore the request a scheduled packet will be in time anyway */
if (current_time + max_delay > sess->next_rtcp_check_time) {
GST_LOG_OBJECT (sess,
@ -3981,20 +4041,12 @@ rtp_session_request_early_rtcp (RTPSession * sess, GstClockTime current_time,
if (T_dither_max) {
/* Schedule an early transmission later */
sess->next_early_rtcp_time = g_random_double () * T_dither_max +
current_time;
current_time + offset;
} else {
/* If no dithering, schedule it for NOW */
sess->next_early_rtcp_time = current_time;
sess->next_early_rtcp_time = current_time + offset;
}
/* RFC 4585 section 3.5.2 step 6 */
sess->allow_early = FALSE;
/* Delay next regular RTCP packet to not exceed the short-term
* RTCP bandwidth when using early feedback as compared to
* without */
sess->next_rtcp_check_time = sess->last_rtcp_check_time + 2 * T_rr;
sess->last_rtcp_check_time += T_rr;
GST_LOG_OBJECT (sess, "next early RTCP time %" GST_TIME_FORMAT
", next regular RTCP time %" GST_TIME_FORMAT,
GST_TIME_ARGS (sess->next_early_rtcp_time),

1
gst/rtpmanager/rtpsession.h
View file

@ -242,6 +242,7 @@ struct _RTPSession {
GstClockTime next_rtcp_check_time; /* tn */
GstClockTime last_rtcp_check_time; /* tp */
GstClockTime last_rtcp_send_time; /* t_rr_last */
GstClockTime last_rtcp_interval; /* T_rr */
GstClockTime start_time;
gboolean first_rtcp;
gboolean allow_early;