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rtpsession: Delay the next regular RTCP packet after early RTCP

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This is required to not exceed the short term average RTCP bitrate when
using early feedback as compared to without early feedback.
This commit is contained in:
Sebastian Dröge 2015-01-22 10:29:39 +01:00
parent bc9111a03d
commit b07b7736b3
1 changed files with 9 additions and 4 deletions
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13
gst/rtpmanager/rtpsession.c
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@ -3791,7 +3791,7 @@ gboolean
rtp_session_request_early_rtcp (RTPSession * sess, GstClockTime current_time,
GstClockTime max_delay)
{
GstClockTime T_dither_max;
GstClockTime T_dither_max, T_rr;
gboolean ret;
/* Implements the algorithm described in RFC 4585 section 3.5.2 */
@ -3812,6 +3812,8 @@ rtp_session_request_early_rtcp (RTPSession * sess, GstClockTime current_time,
goto end;
}
T_rr = sess->next_rtcp_check_time - sess->last_rtcp_send_time;
/* RFC 4585 section 3.5.2 step 2b */
/* If the total sources is <=2, then there is only us and one peer */
/* When there is one auxiliary stream the session can still do point
@ -3821,7 +3823,7 @@ rtp_session_request_early_rtcp (RTPSession * sess, GstClockTime current_time,
T_dither_max = 0;
} else {
/* Divide by 2 because l = 0.5 */
T_dither_max = sess->next_rtcp_check_time - sess->last_rtcp_send_time;
T_dither_max = T_rr;
T_dither_max /= 2;
}
@ -3861,8 +3863,11 @@ rtp_session_request_early_rtcp (RTPSession * sess, GstClockTime current_time,
/* RFC 4585 section 3.5.2 step 6 */
sess->allow_early = FALSE;
/* TODO(mparis): "R MUST recalculate tn = tp + 2*T_rr,
* and MUST set tp to the previous tn" */
/* 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_send_time + 2 * T_rr;
sess->last_rtcp_send_time += T_rr;
GST_LOG_OBJECT (sess, "next early RTCP time %" GST_TIME_FORMAT,
GST_TIME_ARGS (sess->next_early_rtcp_time));