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rtpjitterbuffer: fix bug in reschedule_timer

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The new timeout is always going to be (timeout + delay), however, the
old behavior compared the current timeout to just (timeout), basically
being (delay) off.

This would happen if rtx-delay == rtx-retry-timeout, with the result that
a second rtx attempt for any buffers would be scheduled immediately instead
of after rtx-delay ms.

Simply calculate (new_timeout = timeout + delay) and then use that instead.

https://bugzilla.gnome.org/show_bug.cgi?id=773905
This commit is contained in:
Havard Graff 2016-11-03 16:33:53 +01:00 committed by Sebastian Dröge
parent 752dd15c54
commit bea35f97c8
2 changed files with 82 additions and 8 deletions
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21
gst/rtpmanager/gstrtpjitterbuffer.c
View file

@ -2156,21 +2156,26 @@ reschedule_timer (GstRtpJitterBuffer * jitterbuffer, TimerData * timer,
GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
gboolean seqchange, timechange;
guint16 oldseq;
seqchange = timer->seqnum != seqnum;
timechange = timer->timeout != timeout;
if (!seqchange && !timechange)
return;
GstClockTime new_timeout;
oldseq = timer->seqnum;
new_timeout = timeout + delay;
seqchange = oldseq != seqnum;
timechange = timer->timeout != new_timeout;
if (!seqchange && !timechange) {
GST_DEBUG_OBJECT (jitterbuffer,
"No changes in seqnum (%d) and timeout (%" GST_TIME_FORMAT
"), skipping", oldseq, GST_TIME_ARGS (timer->timeout));
return;
}
GST_DEBUG_OBJECT (jitterbuffer,
"replace timer %d for seqnum %d->%d timeout %" GST_TIME_FORMAT
"->%" GST_TIME_FORMAT, timer->type, oldseq, seqnum,
GST_TIME_ARGS (timer->timeout), GST_TIME_ARGS (timeout + delay));
GST_TIME_ARGS (timer->timeout), GST_TIME_ARGS (new_timeout));
timer->timeout = timeout + delay;
timer->timeout = new_timeout;
timer->seqnum = seqnum;
if (reset) {
GST_DEBUG_OBJECT (jitterbuffer, "reset rtx delay %" GST_TIME_FORMAT

69
tests/check/elements/rtpjitterbuffer.c
View file

@ -2069,6 +2069,74 @@ GST_START_TEST (test_rtx_no_request_if_time_past_retry_period)
GST_END_TEST;
GST_START_TEST (test_rtx_same_delay_and_retry_timeout)
{
GstHarness *h = gst_harness_new ("rtpjitterbuffer");
GstTestClock *testclock;
gint latency_ms = 5 * PCMU_BUF_MS;
gint num_init_buffers = latency_ms / PCMU_BUF_MS + 1;
GstClockTime last_rtx_request;
testclock = gst_harness_get_testclock (h);
gst_harness_set_src_caps (h, generate_caps ());
g_object_set (h->element, "do-retransmission", TRUE, "latency", latency_ms,
"rtx-max-retries", 3, "rtx-delay", 20, "rtx-retry-timeout", 20, NULL);
/* Push/pull buffers and advance time past buffer 0's timeout (in order to
* simplify the test) */
for (gint i = 0; i < num_init_buffers; i++) {
gst_test_clock_set_time (testclock, i * PCMU_BUF_DURATION);
fail_unless_equals_int (GST_FLOW_OK,
gst_harness_push (h, generate_test_buffer (i)));
gst_harness_wait_for_clock_id_waits (h, 1, 60);
}
gst_harness_crank_single_clock_wait (h);
fail_unless_equals_int64 (latency_ms * GST_MSECOND,
gst_clock_get_time (GST_CLOCK (testclock)));
for (gint i = 0; i < num_init_buffers; i++)
gst_buffer_unref (gst_harness_pull (h));
/* drop reconfigure event */
gst_event_unref (gst_harness_pull_upstream_event (h));
/* Crank clock to send retransmission events requesting seqnum 6 which has
* not arrived yet. */
gst_harness_crank_single_clock_wait (h);
verify_rtx_event (gst_harness_pull_upstream_event (h),
6, 6 * PCMU_BUF_DURATION, 20, PCMU_BUF_DURATION);
/* first rtx for seqnum 6 should arrive at 140ms */
last_rtx_request = gst_clock_get_time (GST_CLOCK (testclock));
fail_unless_equals_int64 (last_rtx_request, 140 * GST_MSECOND);
/* verify we have pulled out all rtx-events */
fail_unless_equals_int (0, gst_harness_upstream_events_in_queue (h));
/* now crank to get the second attempt at seqnum 6 */
gst_harness_crank_single_clock_wait (h);
verify_rtx_event (gst_harness_pull_upstream_event (h),
6, 6 * PCMU_BUF_DURATION, 40, PCMU_BUF_DURATION);
/* second rtx for seqnum 6 should arrive at 140 + 20ms */
last_rtx_request = gst_clock_get_time (GST_CLOCK (testclock));
fail_unless_equals_int64 (last_rtx_request, 160 * GST_MSECOND);
/* verify we have pulled out all rtx-events */
fail_unless_equals_int (0, gst_harness_upstream_events_in_queue (h));
fail_unless (verify_jb_stats (h->element,
gst_structure_new ("application/x-rtp-jitterbuffer-stats",
"num-pushed", G_TYPE_UINT64, (guint64) num_init_buffers,
"num-lost", G_TYPE_UINT64, (guint64) 0,
"rtx-count", G_TYPE_UINT64, (guint64) 2, NULL)));
gst_object_unref (testclock);
gst_harness_teardown (h);
}
GST_END_TEST;
GST_START_TEST (test_gap_exceeds_latency)
{
GstHarness *h = gst_harness_new ("rtpjitterbuffer");
@ -2506,6 +2574,7 @@ rtpjitterbuffer_suite (void)
test_rtx_buffer_arrives_after_lost_updates_rtx_stats);
tcase_add_test (tc_chain, test_rtx_rtt_larger_than_retry_timeout);
tcase_add_test (tc_chain, test_rtx_no_request_if_time_past_retry_period);
tcase_add_test (tc_chain, test_rtx_same_delay_and_retry_timeout);
tcase_add_test (tc_chain, test_gap_exceeds_latency);
tcase_add_test (tc_chain, test_deadline_ts_offset);