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rtpjitterbuffer: fix rtx delay calulation when large packet spacing

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This commit is contained in:
Mikhail Fludkov 2019-06-12 10:47:39 +02:00 committed by Havard Graff
parent 6269ed49ab
commit b9c3e354ee
2 changed files with 150 additions and 1 deletions
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5
gst/rtpmanager/gstrtpjitterbuffer.c
View file

@ -2302,6 +2302,9 @@ get_rtx_delay (GstRtpJitterBufferPrivate * priv)
GstClockTime delay;
if (priv->rtx_delay == -1) {
GstClockTime delay_max = (priv->latency_ns > priv->avg_rtx_rtt) ?
priv->latency_ns - priv->avg_rtx_rtt : priv->latency_ns;
if (priv->avg_jitter == 0 && priv->packet_spacing == 0) {
delay = DEFAULT_AUTO_RTX_DELAY;
} else {
@ -2309,6 +2312,8 @@ get_rtx_delay (GstRtpJitterBufferPrivate * priv)
* packet spacing is a good margin */
delay = MAX (priv->avg_jitter * 2, priv->packet_spacing / 2);
}
delay = MIN (delay_max, delay);
} else {
delay = priv->rtx_delay * GST_MSECOND;
}

146
tests/check/elements/rtpjitterbuffer.c
View file

@ -461,12 +461,13 @@ GST_START_TEST (test_clear_pt_map)
GST_END_TEST;
#define TEST_BUF_CLOCK_RATE 8000
#define AS_TEST_BUF_RTP_TIME(gst_time) gst_util_uint64_scale_int (TEST_BUF_CLOCK_RATE, gst_time, GST_SECOND)
#define TEST_BUF_PT 0
#define TEST_BUF_SSRC 0x01BADBAD
#define TEST_BUF_MS 20
#define TEST_BUF_DURATION (TEST_BUF_MS * GST_MSECOND)
#define TEST_BUF_SIZE (64000 * TEST_BUF_MS / 1000)
#define TEST_RTP_TS_DURATION (TEST_BUF_CLOCK_RATE * TEST_BUF_MS / 1000)
#define TEST_RTP_TS_DURATION AS_TEST_BUF_RTP_TIME (TEST_BUF_DURATION)
static GstCaps *
generate_caps (void)
@ -2082,6 +2083,147 @@ GST_START_TEST (test_rtx_timer_reuse)
GST_END_TEST;
static void
start_test_rtx_large_packet_spacing (GstHarness * h,
gint latency_ms, gint frame_dur_ms, gint rtx_rtt_ms,
guint16 * dst_lost_seq, GstClockTime * dst_now)
{
gint i, seq, frame;
GstBuffer *buffer;
GstClockTime now, lost_packet_time;
GstClockTime frame_dur = frame_dur_ms * GST_MSECOND;
gst_harness_set_src_caps (h, generate_caps ());
g_object_set (h->element,
"do-lost", TRUE, "latency", latency_ms, "do-retransmission", TRUE, NULL);
/* Pushing 2 frames @frame_dur_ms ms apart from each other to initialize
* packet_spacing and avg jitter */
for (frame = 0, seq = 0, now = 0; frame < 2;
frame++, seq += 2, now += frame_dur) {
gst_harness_set_time (h, now);
gst_harness_push (h, generate_test_buffer_full (now, seq,
AS_TEST_BUF_RTP_TIME (now)));
gst_harness_push (h, generate_test_buffer_full (now, seq + 1,
AS_TEST_BUF_RTP_TIME (now)));
if (frame == 0)
/* deadline for buffer 0 expires */
gst_harness_crank_single_clock_wait (h);
gst_buffer_unref (gst_harness_pull (h));
gst_buffer_unref (gst_harness_pull (h));
}
/* drop GstEventStreamStart & GstEventCaps & GstEventSegment */
for (i = 0; i < 3; i++)
gst_event_unref (gst_harness_pull_event (h));
/* drop reconfigure event */
gst_event_unref (gst_harness_pull_upstream_event (h));
/* The first packet (#@seq) of the 3rd frame is lost */
lost_packet_time = now;
gst_harness_set_time (h, now);
gst_harness_push (h, generate_test_buffer_full (now, seq + 1,
AS_TEST_BUF_RTP_TIME (now)));
/* RTX delay calculated as:
* MIN(rtx_delay_max, MAX(2*avg_jitter, 0.5 * packet_spacing)).
* Where rtx_delay_max:
* rtx_delay_max = latency - rtx_rtt.
* We have not used RTX yet, so rtx_rtt = 0, rtx_delay_max = latency.
* Thus we expect the first RTX event to be sent in @latency_ms ms */
gst_harness_crank_single_clock_wait (h);
fail_unless_equals_int64 (now + latency_ms * GST_MSECOND,
gst_clock_get_time (GST_ELEMENT_CLOCK (h->element)));
verify_rtx_event (h, seq, now, latency_ms, frame_dur);
verify_lost_event (h, seq, now, 0);
gst_buffer_unref (gst_harness_pull (h));
now += latency_ms * GST_MSECOND;
/* Sending lost packet as RTX to initialize rtx_rtt */
now += rtx_rtt_ms * GST_MSECOND;
gst_harness_set_time (h, now);
buffer =
generate_test_buffer_full (now, seq,
AS_TEST_BUF_RTP_TIME (lost_packet_time));
GST_BUFFER_FLAG_SET (buffer, GST_RTP_BUFFER_FLAG_RETRANSMISSION);
fail_unless_equals_int (GST_FLOW_OK, gst_harness_push (h, buffer));
/* No buffers should be pushed through, as lost packet arrived too late */
fail_unless_equals_int (0, gst_harness_buffers_in_queue (h));
seq += 2;
frame += 1;
now = frame * frame_dur;
gst_harness_set_time (h, now);
/* The first packet (#@seq) of the 4th frame is lost */
gst_harness_push (h, generate_test_buffer_full (now, seq + 1,
AS_TEST_BUF_RTP_TIME (now)));
*dst_lost_seq = seq;
*dst_now = now;
}
GST_START_TEST (test_rtx_large_packet_spacing_and_small_rtt)
{
GstClockTime now;
guint16 lost_seq;
gint latency_ms = 20;
gint frame_dur_ms = 50;
gint rtx_rtt_ms = 5;
GstHarness *h = gst_harness_new ("rtpjitterbuffer");
start_test_rtx_large_packet_spacing (h, latency_ms, frame_dur_ms, rtx_rtt_ms,
&lost_seq, &now);
/* With small rtx_rtt, RTX event expected to be sent in
(@latency_ms - @rtx_rtt_ms) ms */
gst_harness_crank_single_clock_wait (h);
fail_unless_equals_int64 (now + (latency_ms - rtx_rtt_ms) * GST_MSECOND,
gst_clock_get_time (GST_ELEMENT_CLOCK (h->element)));
verify_rtx_event (h, lost_seq, now, (latency_ms - rtx_rtt_ms),
frame_dur_ms * GST_MSECOND);
/* After @latency ms the packet should be considered lost */
gst_harness_crank_single_clock_wait (h);
fail_unless_equals_int64 (now + latency_ms * GST_MSECOND,
gst_clock_get_time (GST_ELEMENT_CLOCK (h->element)));
verify_lost_event (h, lost_seq, now, 0);
gst_buffer_unref (gst_harness_pull (h));
gst_harness_teardown (h);
}
GST_END_TEST;
GST_START_TEST (test_rtx_large_packet_spacing_and_large_rtt)
{
GstClockTime now;
guint16 lost_seq;
gint latency_ms = 20;
gint frame_dur_ms = 50;
gint rtx_rtt_ms = 30;
GstHarness *h = gst_harness_new ("rtpjitterbuffer");
start_test_rtx_large_packet_spacing (h, latency_ms, frame_dur_ms, rtx_rtt_ms,
&lost_seq, &now);
/* With large rtx_rtt, RTX event expected to be sent in @latency_ms ms.
The buffer considered lost. */
gst_harness_crank_single_clock_wait (h);
fail_unless_equals_int64 (now + latency_ms * GST_MSECOND,
gst_clock_get_time (GST_ELEMENT_CLOCK (h->element)));
verify_rtx_event (h, lost_seq, now, latency_ms, frame_dur_ms * GST_MSECOND);
verify_lost_event (h, lost_seq, now, 0);
gst_buffer_unref (gst_harness_pull (h));
gst_harness_teardown (h);
}
GST_END_TEST;
GST_START_TEST (test_deadline_ts_offset)
{
GstHarness *h = gst_harness_new ("rtpjitterbuffer");
@ -2440,6 +2582,8 @@ rtpjitterbuffer_suite (void)
tcase_add_test (tc_chain, test_rtx_same_delay_and_retry_timeout);
tcase_add_test (tc_chain, test_rtx_with_backwards_rtptime);
tcase_add_test (tc_chain, test_rtx_timer_reuse);
tcase_add_test (tc_chain, test_rtx_large_packet_spacing_and_small_rtt);
tcase_add_test (tc_chain, test_rtx_large_packet_spacing_and_large_rtt);
tcase_add_test (tc_chain, test_deadline_ts_offset);
tcase_add_test (tc_chain, test_big_gap_seqnum);