2 * Farsight Voice+Video library
4 * Copyright 2007 Collabora Ltd,
5 * Copyright 2007 Nokia Corporation
6 * @author: Philippe Kalaf <philippe.kalaf@collabora.co.uk>.
7 * Copyright 2007 Wim Taymans <wim.taymans@gmail.com>
8 * Copyright 2015 Kurento (http://kurento.org/)
9 * @author: Miguel ParĂs <mparisdiaz@gmail.com>
10 * Copyright 2016 Pexip AS
11 * @author: Havard Graff <havard@pexip.com>
12 * @author: Stian Selnes <stian@pexip.com>
14 * This library is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU Library General Public
16 * License as published by the Free Software Foundation; either
17 * version 2 of the License, or (at your option) any later version.
19 * This library is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
22 * Library General Public License for more details.
24 * You should have received a copy of the GNU Library General Public
25 * License along with this library; if not, write to the
26 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
27 * Boston, MA 02110-1301, USA.
32 * SECTION:element-rtpjitterbuffer
34 * This element reorders and removes duplicate RTP packets as they are received
35 * from a network source.
37 * The element needs the clock-rate of the RTP payload in order to estimate the
38 * delay. This information is obtained either from the caps on the sink pad or,
39 * when no caps are present, from the #GstRtpJitterBuffer::request-pt-map signal.
40 * To clear the previous pt-map use the #GstRtpJitterBuffer::clear-pt-map signal.
42 * The rtpjitterbuffer will wait for missing packets up to a configurable time
43 * limit using the #GstRtpJitterBuffer:latency property. Packets arriving too
44 * late are considered to be lost packets. If the #GstRtpJitterBuffer:do-lost
45 * property is set, lost packets will result in a custom serialized downstream
46 * event of name GstRTPPacketLost. The lost packet events are usually used by a
47 * depayloader or other element to create concealment data or some other logic
48 * to gracefully handle the missing packets.
50 * The jitterbuffer will use the DTS (or PTS if no DTS is set) of the incomming
51 * buffer and the rtptime inside the RTP packet to create a PTS on the outgoing
54 * The jitterbuffer can also be configured to send early retransmission events
55 * upstream by setting the #GstRtpJitterBuffer:do-retransmission property. In
56 * this mode, the jitterbuffer tries to estimate when a packet should arrive and
57 * sends a custom upstream event named GstRTPRetransmissionRequest when the
58 * packet is considered late. The initial expected packet arrival time is
59 * calculated as follows:
61 * - If seqnum N arrived at time T, seqnum N+1 is expected to arrive at
62 * T + packet-spacing + #GstRtpJitterBuffer:rtx-delay. The packet spacing is
63 * calculated from the DTS (or PTS is no DTS) of two consecutive RTP
64 * packets with different rtptime.
66 * - If seqnum N0 arrived at time T0 and seqnum Nm arrived at time Tm,
67 * seqnum Ni is expected at time Ti = T0 + i*(Tm - T0)/(Nm - N0). Any
68 * previously scheduled timeout is overwritten.
70 * - If seqnum N arrived, all seqnum older than
71 * N - #GstRtpJitterBuffer:rtx-delay-reorder are considered late
72 * immediately. This is to request fast feedback for abonormally reorder
73 * packets before any of the previous timeouts is triggered.
75 * A late packet triggers the GstRTPRetransmissionRequest custom upstream
76 * event. After the initial timeout expires and the retransmission event is
77 * sent, the timeout is scheduled for
78 * T + #GstRtpJitterBuffer:rtx-retry-timeout. If the missing packet did not
79 * arrive after #GstRtpJitterBuffer:rtx-retry-timeout, a new
80 * GstRTPRetransmissionRequest is sent upstream and the timeout is rescheduled
81 * again for T + #GstRtpJitterBuffer:rtx-retry-timeout. This repeats until
82 * #GstRtpJitterBuffer:rtx-retry-period elapsed, at which point no further
83 * retransmission requests are sent and the regular logic is performed to
84 * schedule a lost packet as discussed above.
86 * This element acts as a live element and so adds #GstRtpJitterBuffer:latency
89 * This element will automatically be used inside rtpbin.
92 * <title>Example pipelines</title>
94 * gst-launch-1.0 rtspsrc location=rtsp://192.168.1.133:8554/mpeg1or2AudioVideoTest ! rtpjitterbuffer ! rtpmpvdepay ! mpeg2dec ! xvimagesink
95 * ]| Connect to a streaming server and decode the MPEG video. The jitterbuffer is
96 * inserted into the pipeline to smooth out network jitter and to reorder the
97 * out-of-order RTP packets.
108 #include <gst/rtp/gstrtpbuffer.h>
109 #include <gst/net/net.h>
111 #include "gstrtpjitterbuffer.h"
112 #include "rtpjitterbuffer.h"
113 #include "rtpstats.h"
115 #include <gst/glib-compat-private.h>
117 GST_DEBUG_CATEGORY (rtpjitterbuffer_debug);
118 #define GST_CAT_DEFAULT (rtpjitterbuffer_debug)
120 /* RTPJitterBuffer signals and args */
123 SIGNAL_REQUEST_PT_MAP,
131 #define DEFAULT_LATENCY_MS 200
132 #define DEFAULT_DROP_ON_LATENCY FALSE
133 #define DEFAULT_TS_OFFSET 0
134 #define DEFAULT_DO_LOST FALSE
135 #define DEFAULT_MODE RTP_JITTER_BUFFER_MODE_SLAVE
136 #define DEFAULT_PERCENT 0
137 #define DEFAULT_DO_RETRANSMISSION FALSE
138 #define DEFAULT_RTX_NEXT_SEQNUM TRUE
139 #define DEFAULT_RTX_DELAY -1
140 #define DEFAULT_RTX_MIN_DELAY 0
141 #define DEFAULT_RTX_DELAY_REORDER 3
142 #define DEFAULT_RTX_RETRY_TIMEOUT -1
143 #define DEFAULT_RTX_MIN_RETRY_TIMEOUT -1
144 #define DEFAULT_RTX_RETRY_PERIOD -1
145 #define DEFAULT_RTX_MAX_RETRIES -1
146 #define DEFAULT_RTX_DEADLINE -1
147 #define DEFAULT_RTX_STATS_TIMEOUT 1000
148 #define DEFAULT_MAX_RTCP_RTP_TIME_DIFF 1000
149 #define DEFAULT_MAX_DROPOUT_TIME 60000
150 #define DEFAULT_MAX_MISORDER_TIME 2000
151 #define DEFAULT_RFC7273_SYNC FALSE
153 #define DEFAULT_AUTO_RTX_DELAY (20 * GST_MSECOND)
154 #define DEFAULT_AUTO_RTX_TIMEOUT (40 * GST_MSECOND)
160 PROP_DROP_ON_LATENCY,
165 PROP_DO_RETRANSMISSION,
166 PROP_RTX_NEXT_SEQNUM,
169 PROP_RTX_DELAY_REORDER,
170 PROP_RTX_RETRY_TIMEOUT,
171 PROP_RTX_MIN_RETRY_TIMEOUT,
172 PROP_RTX_RETRY_PERIOD,
173 PROP_RTX_MAX_RETRIES,
175 PROP_RTX_STATS_TIMEOUT,
177 PROP_MAX_RTCP_RTP_TIME_DIFF,
178 PROP_MAX_DROPOUT_TIME,
179 PROP_MAX_MISORDER_TIME,
183 #define JBUF_LOCK(priv) G_STMT_START { \
184 GST_TRACE("Locking from thread %p", g_thread_self()); \
185 (g_mutex_lock (&(priv)->jbuf_lock)); \
186 GST_TRACE("Locked from thread %p", g_thread_self()); \
189 #define JBUF_LOCK_CHECK(priv,label) G_STMT_START { \
191 if (G_UNLIKELY (priv->srcresult != GST_FLOW_OK)) \
194 #define JBUF_UNLOCK(priv) G_STMT_START { \
195 GST_TRACE ("Unlocking from thread %p", g_thread_self ()); \
196 (g_mutex_unlock (&(priv)->jbuf_lock)); \
199 #define JBUF_WAIT_TIMER(priv) G_STMT_START { \
200 GST_DEBUG ("waiting timer"); \
201 (priv)->waiting_timer = TRUE; \
202 g_cond_wait (&(priv)->jbuf_timer, &(priv)->jbuf_lock); \
203 (priv)->waiting_timer = FALSE; \
204 GST_DEBUG ("waiting timer done"); \
206 #define JBUF_SIGNAL_TIMER(priv) G_STMT_START { \
207 if (G_UNLIKELY ((priv)->waiting_timer)) { \
208 GST_DEBUG ("signal timer"); \
209 g_cond_signal (&(priv)->jbuf_timer); \
213 #define JBUF_WAIT_EVENT(priv,label) G_STMT_START { \
214 GST_DEBUG ("waiting event"); \
215 (priv)->waiting_event = TRUE; \
216 g_cond_wait (&(priv)->jbuf_event, &(priv)->jbuf_lock); \
217 (priv)->waiting_event = FALSE; \
218 GST_DEBUG ("waiting event done"); \
219 if (G_UNLIKELY (priv->srcresult != GST_FLOW_OK)) \
222 #define JBUF_SIGNAL_EVENT(priv) G_STMT_START { \
223 if (G_UNLIKELY ((priv)->waiting_event)) { \
224 GST_DEBUG ("signal event"); \
225 g_cond_signal (&(priv)->jbuf_event); \
229 #define JBUF_WAIT_QUERY(priv,label) G_STMT_START { \
230 GST_DEBUG ("waiting query"); \
231 (priv)->waiting_query = TRUE; \
232 g_cond_wait (&(priv)->jbuf_query, &(priv)->jbuf_lock); \
233 (priv)->waiting_query = FALSE; \
234 GST_DEBUG ("waiting query done"); \
235 if (G_UNLIKELY (priv->srcresult != GST_FLOW_OK)) \
238 #define JBUF_SIGNAL_QUERY(priv,res) G_STMT_START { \
239 (priv)->last_query = res; \
240 if (G_UNLIKELY ((priv)->waiting_query)) { \
241 GST_DEBUG ("signal query"); \
242 g_cond_signal (&(priv)->jbuf_query); \
246 #define GST_BUFFER_IS_RETRANSMISSION(buffer) \
247 GST_BUFFER_FLAG_IS_SET (buffer, GST_RTP_BUFFER_FLAG_RETRANSMISSION)
249 typedef struct TimerQueue
252 GHashTable *hashtable;
255 struct _GstRtpJitterBufferPrivate
257 GstPad *sinkpad, *srcpad;
260 RTPJitterBuffer *jbuf;
262 gboolean waiting_timer;
264 gboolean waiting_event;
266 gboolean waiting_query;
274 gboolean timer_running;
275 GThread *timer_thread;
280 gboolean drop_on_latency;
283 gboolean do_retransmission;
284 gboolean rtx_next_seqnum;
287 gint rtx_delay_reorder;
288 gint rtx_retry_timeout;
289 gint rtx_min_retry_timeout;
290 gint rtx_retry_period;
291 gint rtx_max_retries;
292 guint rtx_stats_timeout;
293 gint rtx_deadline_ms;
294 gint max_rtcp_rtp_time_diff;
295 guint32 max_dropout_time;
296 guint32 max_misorder_time;
298 /* the last seqnum we pushed out */
299 guint32 last_popped_seqnum;
300 /* the next expected seqnum we push */
302 /* seqnum-base, if known */
304 /* last output time */
305 GstClockTime last_out_time;
306 /* last valid input timestamp and rtptime pair */
307 GstClockTime ips_pts;
309 GstClockTime packet_spacing;
314 /* the next expected seqnum we receive */
315 GstClockTime last_in_pts;
316 guint32 next_in_seqnum;
319 TimerQueue *rtx_stats_timers;
321 /* start and stop ranges */
322 GstClockTime npt_start;
323 GstClockTime npt_stop;
324 guint64 ext_timestamp;
325 guint64 last_elapsed;
326 guint64 estimated_eos;
333 /* clock rate and rtp timestamp offset */
337 gint64 prev_ts_offset;
339 /* when we are shutting down */
340 GstFlowReturn srcresult;
346 GstClockTime timer_timeout;
347 guint16 timer_seqnum;
348 /* the latency of the upstream peer, we have to take this into account when
349 * synchronizing the buffers. */
350 GstClockTime peer_latency;
354 /* some accounting */
358 guint64 num_duplicates;
359 guint64 num_rtx_requests;
360 guint64 num_rtx_success;
361 guint64 num_rtx_failed;
364 RTPPacketRateCtx packet_rate_ctx;
367 GstClockTime last_dts;
368 guint64 last_rtptime;
369 GstClockTime avg_jitter;
386 GstClockTime timeout;
387 GstClockTime duration;
388 GstClockTime rtx_base;
389 GstClockTime rtx_delay;
390 GstClockTime rtx_retry;
391 GstClockTime rtx_last;
393 guint num_rtx_received;
396 #define GST_RTP_JITTER_BUFFER_GET_PRIVATE(o) \
397 (G_TYPE_INSTANCE_GET_PRIVATE ((o), GST_TYPE_RTP_JITTER_BUFFER, \
398 GstRtpJitterBufferPrivate))
400 static GstStaticPadTemplate gst_rtp_jitter_buffer_sink_template =
401 GST_STATIC_PAD_TEMPLATE ("sink",
404 GST_STATIC_CAPS ("application/x-rtp"
405 /* "clock-rate = (int) [ 1, 2147483647 ], "
406 * "payload = (int) , "
407 * "encoding-name = (string) "
411 static GstStaticPadTemplate gst_rtp_jitter_buffer_sink_rtcp_template =
412 GST_STATIC_PAD_TEMPLATE ("sink_rtcp",
415 GST_STATIC_CAPS ("application/x-rtcp")
418 static GstStaticPadTemplate gst_rtp_jitter_buffer_src_template =
419 GST_STATIC_PAD_TEMPLATE ("src",
422 GST_STATIC_CAPS ("application/x-rtp"
423 /* "payload = (int) , "
424 * "clock-rate = (int) , "
425 * "encoding-name = (string) "
429 static guint gst_rtp_jitter_buffer_signals[LAST_SIGNAL] = { 0 };
431 #define gst_rtp_jitter_buffer_parent_class parent_class
432 G_DEFINE_TYPE (GstRtpJitterBuffer, gst_rtp_jitter_buffer, GST_TYPE_ELEMENT);
434 /* object overrides */
435 static void gst_rtp_jitter_buffer_set_property (GObject * object,
436 guint prop_id, const GValue * value, GParamSpec * pspec);
437 static void gst_rtp_jitter_buffer_get_property (GObject * object,
438 guint prop_id, GValue * value, GParamSpec * pspec);
439 static void gst_rtp_jitter_buffer_finalize (GObject * object);
441 /* element overrides */
442 static GstStateChangeReturn gst_rtp_jitter_buffer_change_state (GstElement
443 * element, GstStateChange transition);
444 static GstPad *gst_rtp_jitter_buffer_request_new_pad (GstElement * element,
445 GstPadTemplate * templ, const gchar * name, const GstCaps * filter);
446 static void gst_rtp_jitter_buffer_release_pad (GstElement * element,
448 static GstClock *gst_rtp_jitter_buffer_provide_clock (GstElement * element);
449 static gboolean gst_rtp_jitter_buffer_set_clock (GstElement * element,
453 static GstCaps *gst_rtp_jitter_buffer_getcaps (GstPad * pad, GstCaps * filter);
454 static GstIterator *gst_rtp_jitter_buffer_iterate_internal_links (GstPad * pad,
457 /* sinkpad overrides */
458 static gboolean gst_rtp_jitter_buffer_sink_event (GstPad * pad,
459 GstObject * parent, GstEvent * event);
460 static GstFlowReturn gst_rtp_jitter_buffer_chain (GstPad * pad,
461 GstObject * parent, GstBuffer * buffer);
463 static gboolean gst_rtp_jitter_buffer_sink_rtcp_event (GstPad * pad,
464 GstObject * parent, GstEvent * event);
465 static GstFlowReturn gst_rtp_jitter_buffer_chain_rtcp (GstPad * pad,
466 GstObject * parent, GstBuffer * buffer);
468 static gboolean gst_rtp_jitter_buffer_sink_query (GstPad * pad,
469 GstObject * parent, GstQuery * query);
471 /* srcpad overrides */
472 static gboolean gst_rtp_jitter_buffer_src_event (GstPad * pad,
473 GstObject * parent, GstEvent * event);
474 static gboolean gst_rtp_jitter_buffer_src_activate_mode (GstPad * pad,
475 GstObject * parent, GstPadMode mode, gboolean active);
476 static void gst_rtp_jitter_buffer_loop (GstRtpJitterBuffer * jitterbuffer);
477 static gboolean gst_rtp_jitter_buffer_src_query (GstPad * pad,
478 GstObject * parent, GstQuery * query);
481 gst_rtp_jitter_buffer_clear_pt_map (GstRtpJitterBuffer * jitterbuffer);
483 gst_rtp_jitter_buffer_set_active (GstRtpJitterBuffer * jitterbuffer,
484 gboolean active, guint64 base_time);
485 static void do_handle_sync (GstRtpJitterBuffer * jitterbuffer);
487 static void unschedule_current_timer (GstRtpJitterBuffer * jitterbuffer);
488 static void remove_all_timers (GstRtpJitterBuffer * jitterbuffer);
490 static void wait_next_timeout (GstRtpJitterBuffer * jitterbuffer);
492 static GstStructure *gst_rtp_jitter_buffer_create_stats (GstRtpJitterBuffer *
495 static void update_rtx_stats (GstRtpJitterBuffer * jitterbuffer,
496 TimerData * timer, GstClockTime dts, gboolean success);
498 static TimerQueue *timer_queue_new (void);
499 static void timer_queue_free (TimerQueue * queue);
502 gst_rtp_jitter_buffer_class_init (GstRtpJitterBufferClass * klass)
504 GObjectClass *gobject_class;
505 GstElementClass *gstelement_class;
507 gobject_class = (GObjectClass *) klass;
508 gstelement_class = (GstElementClass *) klass;
510 g_type_class_add_private (klass, sizeof (GstRtpJitterBufferPrivate));
512 gobject_class->finalize = gst_rtp_jitter_buffer_finalize;
514 gobject_class->set_property = gst_rtp_jitter_buffer_set_property;
515 gobject_class->get_property = gst_rtp_jitter_buffer_get_property;
518 * GstRtpJitterBuffer:latency:
520 * The maximum latency of the jitterbuffer. Packets will be kept in the buffer
521 * for at most this time.
523 g_object_class_install_property (gobject_class, PROP_LATENCY,
524 g_param_spec_uint ("latency", "Buffer latency in ms",
525 "Amount of ms to buffer", 0, G_MAXUINT, DEFAULT_LATENCY_MS,
526 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
528 * GstRtpJitterBuffer:drop-on-latency:
530 * Drop oldest buffers when the queue is completely filled.
532 g_object_class_install_property (gobject_class, PROP_DROP_ON_LATENCY,
533 g_param_spec_boolean ("drop-on-latency",
534 "Drop buffers when maximum latency is reached",
535 "Tells the jitterbuffer to never exceed the given latency in size",
536 DEFAULT_DROP_ON_LATENCY, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
538 * GstRtpJitterBuffer:ts-offset:
540 * Adjust GStreamer output buffer timestamps in the jitterbuffer with offset.
541 * This is mainly used to ensure interstream synchronisation.
543 g_object_class_install_property (gobject_class, PROP_TS_OFFSET,
544 g_param_spec_int64 ("ts-offset", "Timestamp Offset",
545 "Adjust buffer timestamps with offset in nanoseconds", G_MININT64,
546 G_MAXINT64, DEFAULT_TS_OFFSET,
547 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
550 * GstRtpJitterBuffer:do-lost:
552 * Send out a GstRTPPacketLost event downstream when a packet is considered
555 g_object_class_install_property (gobject_class, PROP_DO_LOST,
556 g_param_spec_boolean ("do-lost", "Do Lost",
557 "Send an event downstream when a packet is lost", DEFAULT_DO_LOST,
558 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
561 * GstRtpJitterBuffer:mode:
563 * Control the buffering and timestamping mode used by the jitterbuffer.
565 g_object_class_install_property (gobject_class, PROP_MODE,
566 g_param_spec_enum ("mode", "Mode",
567 "Control the buffering algorithm in use", RTP_TYPE_JITTER_BUFFER_MODE,
568 DEFAULT_MODE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
570 * GstRtpJitterBuffer:percent:
572 * The percent of the jitterbuffer that is filled.
574 g_object_class_install_property (gobject_class, PROP_PERCENT,
575 g_param_spec_int ("percent", "percent",
576 "The buffer filled percent", 0, 100,
577 0, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
579 * GstRtpJitterBuffer:do-retransmission:
581 * Send out a GstRTPRetransmission event upstream when a packet is considered
582 * late and should be retransmitted.
586 g_object_class_install_property (gobject_class, PROP_DO_RETRANSMISSION,
587 g_param_spec_boolean ("do-retransmission", "Do Retransmission",
588 "Send retransmission events upstream when a packet is late",
589 DEFAULT_DO_RETRANSMISSION,
590 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
593 * GstRtpJitterBuffer:rtx-next-seqnum
595 * Estimate when the next packet should arrive and schedule a retransmission
597 * This is, when packet N arrives, a GstRTPRetransmission event is schedule
598 * for packet N+1. So it will be requested if it does not arrive at the expected time.
599 * The expected time is calculated using the dts of N and the packet spacing.
603 g_object_class_install_property (gobject_class, PROP_RTX_NEXT_SEQNUM,
604 g_param_spec_boolean ("rtx-next-seqnum", "RTX next seqnum",
605 "Estimate when the next packet should arrive and schedule a "
606 "retransmission request for it.",
607 DEFAULT_RTX_NEXT_SEQNUM, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
610 * GstRtpJitterBuffer:rtx-delay:
612 * When a packet did not arrive at the expected time, wait this extra amount
613 * of time before sending a retransmission event.
615 * When -1 is used, the max jitter will be used as extra delay.
619 g_object_class_install_property (gobject_class, PROP_RTX_DELAY,
620 g_param_spec_int ("rtx-delay", "RTX Delay",
621 "Extra time in ms to wait before sending retransmission "
622 "event (-1 automatic)", -1, G_MAXINT, DEFAULT_RTX_DELAY,
623 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
626 * GstRtpJitterBuffer:rtx-min-delay:
628 * When a packet did not arrive at the expected time, wait at least this extra amount
629 * of time before sending a retransmission event.
633 g_object_class_install_property (gobject_class, PROP_RTX_MIN_DELAY,
634 g_param_spec_uint ("rtx-min-delay", "Minimum RTX Delay",
635 "Minimum time in ms to wait before sending retransmission "
636 "event", 0, G_MAXUINT, DEFAULT_RTX_MIN_DELAY,
637 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
639 * GstRtpJitterBuffer:rtx-delay-reorder:
641 * Assume that a retransmission event should be sent when we see
642 * this much packet reordering.
644 * When -1 is used, the value will be estimated based on observed packet
645 * reordering. When 0 is used packet reordering alone will not cause a
646 * retransmission event (Since 1.10).
650 g_object_class_install_property (gobject_class, PROP_RTX_DELAY_REORDER,
651 g_param_spec_int ("rtx-delay-reorder", "RTX Delay Reorder",
652 "Sending retransmission event when this much reordering "
653 "(0 disable, -1 automatic)",
654 -1, G_MAXINT, DEFAULT_RTX_DELAY_REORDER,
655 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
657 * GstRtpJitterBuffer::rtx-retry-timeout:
659 * When no packet has been received after sending a retransmission event
660 * for this time, retry sending a retransmission event.
662 * When -1 is used, the value will be estimated based on observed round
667 g_object_class_install_property (gobject_class, PROP_RTX_RETRY_TIMEOUT,
668 g_param_spec_int ("rtx-retry-timeout", "RTX Retry Timeout",
669 "Retry sending a transmission event after this timeout in "
670 "ms (-1 automatic)", -1, G_MAXINT, DEFAULT_RTX_RETRY_TIMEOUT,
671 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
673 * GstRtpJitterBuffer::rtx-min-retry-timeout:
675 * The minimum amount of time between retry timeouts. When
676 * GstRtpJitterBuffer::rtx-retry-timeout is -1, this value ensures a
677 * minimum interval between retry timeouts.
679 * When -1 is used, the value will be estimated based on the
684 g_object_class_install_property (gobject_class, PROP_RTX_MIN_RETRY_TIMEOUT,
685 g_param_spec_int ("rtx-min-retry-timeout", "RTX Min Retry Timeout",
686 "Minimum timeout between sending a transmission event in "
687 "ms (-1 automatic)", -1, G_MAXINT, DEFAULT_RTX_MIN_RETRY_TIMEOUT,
688 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
690 * GstRtpJitterBuffer:rtx-retry-period:
692 * The amount of time to try to get a retransmission.
694 * When -1 is used, the value will be estimated based on the jitterbuffer
695 * latency and the observed round trip time.
699 g_object_class_install_property (gobject_class, PROP_RTX_RETRY_PERIOD,
700 g_param_spec_int ("rtx-retry-period", "RTX Retry Period",
701 "Try to get a retransmission for this many ms "
702 "(-1 automatic)", -1, G_MAXINT, DEFAULT_RTX_RETRY_PERIOD,
703 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
705 * GstRtpJitterBuffer:rtx-max-retries:
707 * The maximum number of retries to request a retransmission.
709 * This implies that as maximum (rtx-max-retries + 1) retransmissions will be requested.
710 * When -1 is used, the number of retransmission request will not be limited.
714 g_object_class_install_property (gobject_class, PROP_RTX_MAX_RETRIES,
715 g_param_spec_int ("rtx-max-retries", "RTX Max Retries",
716 "The maximum number of retries to request a retransmission. "
717 "(-1 not limited)", -1, G_MAXINT, DEFAULT_RTX_MAX_RETRIES,
718 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
720 * GstRtpJitterBuffer:rtx-deadline:
722 * The deadline for a valid RTX request in ms.
724 * How long the RTX RTCP will be valid for.
725 * When -1 is used, the size of the jitterbuffer will be used.
729 g_object_class_install_property (gobject_class, PROP_RTX_DEADLINE,
730 g_param_spec_int ("rtx-deadline", "RTX Deadline (ms)",
731 "The deadline for a valid RTX request in milliseconds. "
732 "(-1 automatic)", -1, G_MAXINT, DEFAULT_RTX_DEADLINE,
733 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
735 * GstRtpJitterBuffer::rtx-stats-timeout:
737 * The time to wait for a retransmitted packet after it has been
738 * considered lost in order to collect RTX statistics.
742 g_object_class_install_property (gobject_class, PROP_RTX_STATS_TIMEOUT,
743 g_param_spec_uint ("rtx-stats-timeout", "RTX Statistics Timeout",
744 "The time to wait for a retransmitted packet after it has been "
745 "considered lost in order to collect statistics (ms)",
746 0, G_MAXUINT, DEFAULT_RTX_STATS_TIMEOUT,
747 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
749 g_object_class_install_property (gobject_class, PROP_MAX_DROPOUT_TIME,
750 g_param_spec_uint ("max-dropout-time", "Max dropout time",
751 "The maximum time (milliseconds) of missing packets tolerated.",
752 0, G_MAXUINT, DEFAULT_MAX_DROPOUT_TIME,
753 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
755 g_object_class_install_property (gobject_class, PROP_MAX_MISORDER_TIME,
756 g_param_spec_uint ("max-misorder-time", "Max misorder time",
757 "The maximum time (milliseconds) of misordered packets tolerated.",
758 0, G_MAXUINT, DEFAULT_MAX_MISORDER_TIME,
759 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
761 * GstRtpJitterBuffer:stats:
763 * Various jitterbuffer statistics. This property returns a GstStructure
764 * with name application/x-rtp-jitterbuffer-stats with the following fields:
770 * <classname>"num-pushed"</classname>:
771 * the number of packets pushed out.
777 * <classname>"num-lost"</classname>:
778 * the number of packets considered lost.
784 * <classname>"num-late"</classname>:
785 * the number of packets arriving too late.
791 * <classname>"num-duplicates"</classname>:
792 * the number of duplicate packets.
798 * <classname>"rtx-count"</classname>:
799 * the number of retransmissions requested.
805 * <classname>"rtx-success-count"</classname>:
806 * the number of successful retransmissions.
812 * <classname>"rtx-per-packet"</classname>:
813 * average number of RTX per packet.
819 * <classname>"rtx-rtt"</classname>:
820 * average round trip time per RTX.
827 g_object_class_install_property (gobject_class, PROP_STATS,
828 g_param_spec_boxed ("stats", "Statistics",
829 "Various statistics", GST_TYPE_STRUCTURE,
830 G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
833 * GstRtpJitterBuffer:max-rtcp-rtp-time-diff
835 * The maximum amount of time in ms that the RTP time in the RTCP SRs
836 * is allowed to be ahead of the last RTP packet we received. Use
837 * -1 to disable ignoring of RTCP packets.
841 g_object_class_install_property (gobject_class, PROP_MAX_RTCP_RTP_TIME_DIFF,
842 g_param_spec_int ("max-rtcp-rtp-time-diff", "Max RTCP RTP Time Diff",
843 "Maximum amount of time in ms that the RTP time in RTCP SRs "
844 "is allowed to be ahead (-1 disabled)", -1, G_MAXINT,
845 DEFAULT_MAX_RTCP_RTP_TIME_DIFF,
846 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
848 g_object_class_install_property (gobject_class, PROP_RFC7273_SYNC,
849 g_param_spec_boolean ("rfc7273-sync", "Sync on RFC7273 clock",
850 "Synchronize received streams to the RFC7273 clock "
851 "(requires clock and offset to be provided)", DEFAULT_RFC7273_SYNC,
852 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
855 * GstRtpJitterBuffer::request-pt-map:
856 * @buffer: the object which received the signal
859 * Request the payload type as #GstCaps for @pt.
861 gst_rtp_jitter_buffer_signals[SIGNAL_REQUEST_PT_MAP] =
862 g_signal_new ("request-pt-map", G_TYPE_FROM_CLASS (klass),
863 G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstRtpJitterBufferClass,
864 request_pt_map), NULL, NULL, g_cclosure_marshal_generic,
865 GST_TYPE_CAPS, 1, G_TYPE_UINT);
867 * GstRtpJitterBuffer::handle-sync:
868 * @buffer: the object which received the signal
869 * @struct: a GstStructure containing sync values.
871 * Be notified of new sync values.
873 gst_rtp_jitter_buffer_signals[SIGNAL_HANDLE_SYNC] =
874 g_signal_new ("handle-sync", G_TYPE_FROM_CLASS (klass),
875 G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstRtpJitterBufferClass,
876 handle_sync), NULL, NULL, g_cclosure_marshal_VOID__BOXED,
877 G_TYPE_NONE, 1, GST_TYPE_STRUCTURE | G_SIGNAL_TYPE_STATIC_SCOPE);
880 * GstRtpJitterBuffer::on-npt-stop:
881 * @buffer: the object which received the signal
883 * Signal that the jitterbufer has pushed the RTP packet that corresponds to
884 * the npt-stop position.
886 gst_rtp_jitter_buffer_signals[SIGNAL_ON_NPT_STOP] =
887 g_signal_new ("on-npt-stop", G_TYPE_FROM_CLASS (klass),
888 G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstRtpJitterBufferClass,
889 on_npt_stop), NULL, NULL, g_cclosure_marshal_VOID__VOID,
890 G_TYPE_NONE, 0, G_TYPE_NONE);
893 * GstRtpJitterBuffer::clear-pt-map:
894 * @buffer: the object which received the signal
896 * Invalidate the clock-rate as obtained with the
897 * #GstRtpJitterBuffer::request-pt-map signal.
899 gst_rtp_jitter_buffer_signals[SIGNAL_CLEAR_PT_MAP] =
900 g_signal_new ("clear-pt-map", G_TYPE_FROM_CLASS (klass),
901 G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
902 G_STRUCT_OFFSET (GstRtpJitterBufferClass, clear_pt_map), NULL, NULL,
903 g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0, G_TYPE_NONE);
906 * GstRtpJitterBuffer::set-active:
907 * @buffer: the object which received the signal
909 * Start pushing out packets with the given base time. This signal is only
910 * useful in buffering mode.
912 * Returns: the time of the last pushed packet.
914 gst_rtp_jitter_buffer_signals[SIGNAL_SET_ACTIVE] =
915 g_signal_new ("set-active", G_TYPE_FROM_CLASS (klass),
916 G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
917 G_STRUCT_OFFSET (GstRtpJitterBufferClass, set_active), NULL, NULL,
918 g_cclosure_marshal_generic, G_TYPE_UINT64, 2, G_TYPE_BOOLEAN,
921 gstelement_class->change_state =
922 GST_DEBUG_FUNCPTR (gst_rtp_jitter_buffer_change_state);
923 gstelement_class->request_new_pad =
924 GST_DEBUG_FUNCPTR (gst_rtp_jitter_buffer_request_new_pad);
925 gstelement_class->release_pad =
926 GST_DEBUG_FUNCPTR (gst_rtp_jitter_buffer_release_pad);
927 gstelement_class->provide_clock =
928 GST_DEBUG_FUNCPTR (gst_rtp_jitter_buffer_provide_clock);
929 gstelement_class->set_clock =
930 GST_DEBUG_FUNCPTR (gst_rtp_jitter_buffer_set_clock);
932 gst_element_class_add_static_pad_template (gstelement_class,
933 &gst_rtp_jitter_buffer_src_template);
934 gst_element_class_add_static_pad_template (gstelement_class,
935 &gst_rtp_jitter_buffer_sink_template);
936 gst_element_class_add_static_pad_template (gstelement_class,
937 &gst_rtp_jitter_buffer_sink_rtcp_template);
939 gst_element_class_set_static_metadata (gstelement_class,
940 "RTP packet jitter-buffer", "Filter/Network/RTP",
941 "A buffer that deals with network jitter and other transmission faults",
942 "Philippe Kalaf <philippe.kalaf@collabora.co.uk>, "
943 "Wim Taymans <wim.taymans@gmail.com>");
945 klass->clear_pt_map = GST_DEBUG_FUNCPTR (gst_rtp_jitter_buffer_clear_pt_map);
946 klass->set_active = GST_DEBUG_FUNCPTR (gst_rtp_jitter_buffer_set_active);
948 GST_DEBUG_CATEGORY_INIT
949 (rtpjitterbuffer_debug, "rtpjitterbuffer", 0, "RTP Jitter Buffer");
953 gst_rtp_jitter_buffer_init (GstRtpJitterBuffer * jitterbuffer)
955 GstRtpJitterBufferPrivate *priv;
957 priv = GST_RTP_JITTER_BUFFER_GET_PRIVATE (jitterbuffer);
958 jitterbuffer->priv = priv;
960 priv->latency_ms = DEFAULT_LATENCY_MS;
961 priv->latency_ns = priv->latency_ms * GST_MSECOND;
962 priv->drop_on_latency = DEFAULT_DROP_ON_LATENCY;
963 priv->do_lost = DEFAULT_DO_LOST;
964 priv->do_retransmission = DEFAULT_DO_RETRANSMISSION;
965 priv->rtx_next_seqnum = DEFAULT_RTX_NEXT_SEQNUM;
966 priv->rtx_delay = DEFAULT_RTX_DELAY;
967 priv->rtx_min_delay = DEFAULT_RTX_MIN_DELAY;
968 priv->rtx_delay_reorder = DEFAULT_RTX_DELAY_REORDER;
969 priv->rtx_retry_timeout = DEFAULT_RTX_RETRY_TIMEOUT;
970 priv->rtx_min_retry_timeout = DEFAULT_RTX_MIN_RETRY_TIMEOUT;
971 priv->rtx_retry_period = DEFAULT_RTX_RETRY_PERIOD;
972 priv->rtx_max_retries = DEFAULT_RTX_MAX_RETRIES;
973 priv->rtx_deadline_ms = DEFAULT_RTX_DEADLINE;
974 priv->rtx_stats_timeout = DEFAULT_RTX_STATS_TIMEOUT;
975 priv->max_rtcp_rtp_time_diff = DEFAULT_MAX_RTCP_RTP_TIME_DIFF;
976 priv->max_dropout_time = DEFAULT_MAX_DROPOUT_TIME;
977 priv->max_misorder_time = DEFAULT_MAX_MISORDER_TIME;
980 priv->last_rtptime = -1;
981 priv->avg_jitter = 0;
982 priv->timers = g_array_new (FALSE, TRUE, sizeof (TimerData));
983 priv->rtx_stats_timers = timer_queue_new ();
984 priv->jbuf = rtp_jitter_buffer_new ();
985 g_mutex_init (&priv->jbuf_lock);
986 g_cond_init (&priv->jbuf_timer);
987 g_cond_init (&priv->jbuf_event);
988 g_cond_init (&priv->jbuf_query);
989 g_queue_init (&priv->gap_packets);
990 gst_segment_init (&priv->segment, GST_FORMAT_TIME);
992 /* reset skew detection initialy */
993 rtp_jitter_buffer_reset_skew (priv->jbuf);
994 rtp_jitter_buffer_set_delay (priv->jbuf, priv->latency_ns);
995 rtp_jitter_buffer_set_buffering (priv->jbuf, FALSE);
999 gst_pad_new_from_static_template (&gst_rtp_jitter_buffer_src_template,
1002 gst_pad_set_activatemode_function (priv->srcpad,
1003 GST_DEBUG_FUNCPTR (gst_rtp_jitter_buffer_src_activate_mode));
1004 gst_pad_set_query_function (priv->srcpad,
1005 GST_DEBUG_FUNCPTR (gst_rtp_jitter_buffer_src_query));
1006 gst_pad_set_event_function (priv->srcpad,
1007 GST_DEBUG_FUNCPTR (gst_rtp_jitter_buffer_src_event));
1010 gst_pad_new_from_static_template (&gst_rtp_jitter_buffer_sink_template,
1013 gst_pad_set_chain_function (priv->sinkpad,
1014 GST_DEBUG_FUNCPTR (gst_rtp_jitter_buffer_chain));
1015 gst_pad_set_event_function (priv->sinkpad,
1016 GST_DEBUG_FUNCPTR (gst_rtp_jitter_buffer_sink_event));
1017 gst_pad_set_query_function (priv->sinkpad,
1018 GST_DEBUG_FUNCPTR (gst_rtp_jitter_buffer_sink_query));
1020 gst_element_add_pad (GST_ELEMENT (jitterbuffer), priv->srcpad);
1021 gst_element_add_pad (GST_ELEMENT (jitterbuffer), priv->sinkpad);
1023 GST_OBJECT_FLAG_SET (jitterbuffer, GST_ELEMENT_FLAG_PROVIDE_CLOCK);
1026 #define IS_DROPABLE(it) (((it)->type == ITEM_TYPE_BUFFER) || ((it)->type == ITEM_TYPE_LOST))
1028 #define ITEM_TYPE_BUFFER 0
1029 #define ITEM_TYPE_LOST 1
1030 #define ITEM_TYPE_EVENT 2
1031 #define ITEM_TYPE_QUERY 3
1033 static RTPJitterBufferItem *
1034 alloc_item (gpointer data, guint type, GstClockTime dts, GstClockTime pts,
1035 guint seqnum, guint count, guint rtptime)
1037 RTPJitterBufferItem *item;
1039 item = g_slice_new (RTPJitterBufferItem);
1046 item->seqnum = seqnum;
1047 item->count = count;
1048 item->rtptime = rtptime;
1054 free_item (RTPJitterBufferItem * item)
1056 g_return_if_fail (item != NULL);
1058 if (item->data && item->type != ITEM_TYPE_QUERY)
1059 gst_mini_object_unref (item->data);
1060 g_slice_free (RTPJitterBufferItem, item);
1064 free_item_and_retain_events (RTPJitterBufferItem * item, gpointer user_data)
1066 GList **l = user_data;
1068 if (item->data && item->type == ITEM_TYPE_EVENT
1069 && GST_EVENT_IS_STICKY (item->data)) {
1070 *l = g_list_prepend (*l, item->data);
1071 } else if (item->data && item->type != ITEM_TYPE_QUERY) {
1072 gst_mini_object_unref (item->data);
1074 g_slice_free (RTPJitterBufferItem, item);
1078 gst_rtp_jitter_buffer_finalize (GObject * object)
1080 GstRtpJitterBuffer *jitterbuffer;
1081 GstRtpJitterBufferPrivate *priv;
1083 jitterbuffer = GST_RTP_JITTER_BUFFER (object);
1084 priv = jitterbuffer->priv;
1086 g_array_free (priv->timers, TRUE);
1087 timer_queue_free (priv->rtx_stats_timers);
1088 g_mutex_clear (&priv->jbuf_lock);
1089 g_cond_clear (&priv->jbuf_timer);
1090 g_cond_clear (&priv->jbuf_event);
1091 g_cond_clear (&priv->jbuf_query);
1093 rtp_jitter_buffer_flush (priv->jbuf, (GFunc) free_item, NULL);
1094 g_queue_foreach (&priv->gap_packets, (GFunc) gst_buffer_unref, NULL);
1095 g_queue_clear (&priv->gap_packets);
1096 g_object_unref (priv->jbuf);
1098 G_OBJECT_CLASS (parent_class)->finalize (object);
1101 static GstIterator *
1102 gst_rtp_jitter_buffer_iterate_internal_links (GstPad * pad, GstObject * parent)
1104 GstRtpJitterBuffer *jitterbuffer;
1105 GstPad *otherpad = NULL;
1106 GstIterator *it = NULL;
1107 GValue val = { 0, };
1109 jitterbuffer = GST_RTP_JITTER_BUFFER_CAST (parent);
1111 if (pad == jitterbuffer->priv->sinkpad) {
1112 otherpad = jitterbuffer->priv->srcpad;
1113 } else if (pad == jitterbuffer->priv->srcpad) {
1114 otherpad = jitterbuffer->priv->sinkpad;
1115 } else if (pad == jitterbuffer->priv->rtcpsinkpad) {
1116 it = gst_iterator_new_single (GST_TYPE_PAD, NULL);
1120 g_value_init (&val, GST_TYPE_PAD);
1121 g_value_set_object (&val, otherpad);
1122 it = gst_iterator_new_single (GST_TYPE_PAD, &val);
1123 g_value_unset (&val);
1130 create_rtcp_sink (GstRtpJitterBuffer * jitterbuffer)
1132 GstRtpJitterBufferPrivate *priv;
1134 priv = jitterbuffer->priv;
1136 GST_DEBUG_OBJECT (jitterbuffer, "creating RTCP sink pad");
1139 gst_pad_new_from_static_template
1140 (&gst_rtp_jitter_buffer_sink_rtcp_template, "sink_rtcp");
1141 gst_pad_set_chain_function (priv->rtcpsinkpad,
1142 gst_rtp_jitter_buffer_chain_rtcp);
1143 gst_pad_set_event_function (priv->rtcpsinkpad,
1144 (GstPadEventFunction) gst_rtp_jitter_buffer_sink_rtcp_event);
1145 gst_pad_set_iterate_internal_links_function (priv->rtcpsinkpad,
1146 gst_rtp_jitter_buffer_iterate_internal_links);
1147 gst_pad_set_active (priv->rtcpsinkpad, TRUE);
1148 gst_element_add_pad (GST_ELEMENT_CAST (jitterbuffer), priv->rtcpsinkpad);
1150 return priv->rtcpsinkpad;
1154 remove_rtcp_sink (GstRtpJitterBuffer * jitterbuffer)
1156 GstRtpJitterBufferPrivate *priv;
1158 priv = jitterbuffer->priv;
1160 GST_DEBUG_OBJECT (jitterbuffer, "removing RTCP sink pad");
1162 gst_pad_set_active (priv->rtcpsinkpad, FALSE);
1164 gst_element_remove_pad (GST_ELEMENT_CAST (jitterbuffer), priv->rtcpsinkpad);
1165 priv->rtcpsinkpad = NULL;
1169 gst_rtp_jitter_buffer_request_new_pad (GstElement * element,
1170 GstPadTemplate * templ, const gchar * name, const GstCaps * filter)
1172 GstRtpJitterBuffer *jitterbuffer;
1173 GstElementClass *klass;
1175 GstRtpJitterBufferPrivate *priv;
1177 g_return_val_if_fail (templ != NULL, NULL);
1178 g_return_val_if_fail (GST_IS_RTP_JITTER_BUFFER (element), NULL);
1180 jitterbuffer = GST_RTP_JITTER_BUFFER_CAST (element);
1181 priv = jitterbuffer->priv;
1182 klass = GST_ELEMENT_GET_CLASS (element);
1184 GST_DEBUG_OBJECT (element, "requesting pad %s", GST_STR_NULL (name));
1186 /* figure out the template */
1187 if (templ == gst_element_class_get_pad_template (klass, "sink_rtcp")) {
1188 if (priv->rtcpsinkpad != NULL)
1191 result = create_rtcp_sink (jitterbuffer);
1193 goto wrong_template;
1200 g_warning ("rtpjitterbuffer: this is not our template");
1205 g_warning ("rtpjitterbuffer: pad already requested");
1211 gst_rtp_jitter_buffer_release_pad (GstElement * element, GstPad * pad)
1213 GstRtpJitterBuffer *jitterbuffer;
1214 GstRtpJitterBufferPrivate *priv;
1216 g_return_if_fail (GST_IS_RTP_JITTER_BUFFER (element));
1217 g_return_if_fail (GST_IS_PAD (pad));
1219 jitterbuffer = GST_RTP_JITTER_BUFFER_CAST (element);
1220 priv = jitterbuffer->priv;
1222 GST_DEBUG_OBJECT (element, "releasing pad %s:%s", GST_DEBUG_PAD_NAME (pad));
1224 if (priv->rtcpsinkpad == pad) {
1225 remove_rtcp_sink (jitterbuffer);
1234 g_warning ("gstjitterbuffer: asked to release an unknown pad");
1240 gst_rtp_jitter_buffer_provide_clock (GstElement * element)
1242 return gst_system_clock_obtain ();
1246 gst_rtp_jitter_buffer_set_clock (GstElement * element, GstClock * clock)
1248 GstRtpJitterBuffer *jitterbuffer = GST_RTP_JITTER_BUFFER (element);
1250 rtp_jitter_buffer_set_pipeline_clock (jitterbuffer->priv->jbuf, clock);
1252 return GST_ELEMENT_CLASS (parent_class)->set_clock (element, clock);
1256 gst_rtp_jitter_buffer_clear_pt_map (GstRtpJitterBuffer * jitterbuffer)
1258 GstRtpJitterBufferPrivate *priv;
1260 priv = jitterbuffer->priv;
1262 /* this will trigger a new pt-map request signal, FIXME, do something better. */
1265 priv->clock_rate = -1;
1266 /* do not clear current content, but refresh state for new arrival */
1267 GST_DEBUG_OBJECT (jitterbuffer, "reset jitterbuffer");
1268 rtp_jitter_buffer_reset_skew (priv->jbuf);
1273 gst_rtp_jitter_buffer_set_active (GstRtpJitterBuffer * jbuf, gboolean active,
1276 GstRtpJitterBufferPrivate *priv;
1277 GstClockTime last_out;
1278 RTPJitterBufferItem *item;
1283 GST_DEBUG_OBJECT (jbuf, "setting active %d with offset %" GST_TIME_FORMAT,
1284 active, GST_TIME_ARGS (offset));
1286 if (active != priv->active) {
1287 /* add the amount of time spent in paused to the output offset. All
1288 * outgoing buffers will have this offset applied to their timestamps in
1289 * order to make them arrive in time in the sink. */
1290 priv->out_offset = offset;
1291 GST_DEBUG_OBJECT (jbuf, "out offset %" GST_TIME_FORMAT,
1292 GST_TIME_ARGS (priv->out_offset));
1293 priv->active = active;
1294 JBUF_SIGNAL_EVENT (priv);
1297 rtp_jitter_buffer_set_buffering (priv->jbuf, TRUE);
1299 if ((item = rtp_jitter_buffer_peek (priv->jbuf))) {
1300 /* head buffer timestamp and offset gives our output time */
1301 last_out = item->pts + priv->ts_offset;
1303 /* use last known time when the buffer is empty */
1304 last_out = priv->last_out_time;
1312 gst_rtp_jitter_buffer_getcaps (GstPad * pad, GstCaps * filter)
1314 GstRtpJitterBuffer *jitterbuffer;
1315 GstRtpJitterBufferPrivate *priv;
1320 jitterbuffer = GST_RTP_JITTER_BUFFER (gst_pad_get_parent (pad));
1321 priv = jitterbuffer->priv;
1323 other = (pad == priv->srcpad ? priv->sinkpad : priv->srcpad);
1325 caps = gst_pad_peer_query_caps (other, filter);
1327 templ = gst_pad_get_pad_template_caps (pad);
1329 GST_DEBUG_OBJECT (jitterbuffer, "use template");
1334 GST_DEBUG_OBJECT (jitterbuffer, "intersect with template");
1336 intersect = gst_caps_intersect (caps, templ);
1337 gst_caps_unref (caps);
1338 gst_caps_unref (templ);
1342 gst_object_unref (jitterbuffer);
1348 * Must be called with JBUF_LOCK held
1352 gst_jitter_buffer_sink_parse_caps (GstRtpJitterBuffer * jitterbuffer,
1353 GstCaps * caps, gint pt)
1355 GstRtpJitterBufferPrivate *priv;
1356 GstStructure *caps_struct;
1360 const gchar *ts_refclk, *mediaclk;
1362 priv = jitterbuffer->priv;
1364 /* first parse the caps */
1365 caps_struct = gst_caps_get_structure (caps, 0);
1367 GST_DEBUG_OBJECT (jitterbuffer, "got caps %" GST_PTR_FORMAT, caps);
1369 if (gst_structure_get_int (caps_struct, "payload", &payload) && pt != -1
1371 GST_ERROR_OBJECT (jitterbuffer,
1372 "Got caps with wrong payload type (got %d, expected %d)", payload, pt);
1376 if (payload != -1) {
1377 GST_DEBUG_OBJECT (jitterbuffer, "Got payload type %d", payload);
1378 priv->last_pt = payload;
1381 /* we need a clock-rate to convert the rtp timestamps to GStreamer time and to
1382 * measure the amount of data in the buffer */
1383 if (!gst_structure_get_int (caps_struct, "clock-rate", &priv->clock_rate))
1386 if (priv->clock_rate <= 0)
1389 GST_DEBUG_OBJECT (jitterbuffer, "got clock-rate %d", priv->clock_rate);
1391 rtp_jitter_buffer_set_clock_rate (priv->jbuf, priv->clock_rate);
1393 gst_rtp_packet_rate_ctx_reset (&priv->packet_rate_ctx, priv->clock_rate);
1395 /* The clock base is the RTP timestamp corrsponding to the npt-start value. We
1396 * can use this to track the amount of time elapsed on the sender. */
1397 if (gst_structure_get_uint (caps_struct, "clock-base", &val))
1398 priv->clock_base = val;
1400 priv->clock_base = -1;
1402 priv->ext_timestamp = priv->clock_base;
1404 GST_DEBUG_OBJECT (jitterbuffer, "got clock-base %" G_GINT64_FORMAT,
1407 if (gst_structure_get_uint (caps_struct, "seqnum-base", &val)) {
1408 /* first expected seqnum, only update when we didn't have a previous base. */
1409 if (priv->next_in_seqnum == -1)
1410 priv->next_in_seqnum = val;
1411 if (priv->next_seqnum == -1) {
1412 priv->next_seqnum = val;
1413 JBUF_SIGNAL_EVENT (priv);
1415 priv->seqnum_base = val;
1417 priv->seqnum_base = -1;
1420 GST_DEBUG_OBJECT (jitterbuffer, "got seqnum-base %d", priv->next_in_seqnum);
1422 /* the start and stop times. The seqnum-base corresponds to the start time. We
1423 * will keep track of the seqnums on the output and when we reach the one
1424 * corresponding to npt-stop, we emit the npt-stop-reached signal */
1425 if (gst_structure_get_clock_time (caps_struct, "npt-start", &tval))
1426 priv->npt_start = tval;
1428 priv->npt_start = 0;
1430 if (gst_structure_get_clock_time (caps_struct, "npt-stop", &tval))
1431 priv->npt_stop = tval;
1433 priv->npt_stop = -1;
1435 GST_DEBUG_OBJECT (jitterbuffer,
1436 "npt start/stop: %" GST_TIME_FORMAT "-%" GST_TIME_FORMAT,
1437 GST_TIME_ARGS (priv->npt_start), GST_TIME_ARGS (priv->npt_stop));
1439 if ((ts_refclk = gst_structure_get_string (caps_struct, "a-ts-refclk"))) {
1440 GstClock *clock = NULL;
1441 guint64 clock_offset = -1;
1443 GST_DEBUG_OBJECT (jitterbuffer, "Have timestamp reference clock %s",
1446 if (g_str_has_prefix (ts_refclk, "ntp=")) {
1447 if (g_str_has_prefix (ts_refclk, "ntp=/traceable/")) {
1448 GST_FIXME_OBJECT (jitterbuffer, "Can't handle traceable NTP clocks");
1450 const gchar *host, *portstr;
1454 host = ts_refclk + sizeof ("ntp=") - 1;
1455 if (host[0] == '[') {
1457 portstr = strchr (host, ']');
1458 if (portstr && portstr[1] == ':')
1459 portstr = portstr + 1;
1463 portstr = strrchr (host, ':');
1467 if (!portstr || sscanf (portstr, ":%u", &port) != 1)
1471 hostname = g_strndup (host, (portstr - host));
1473 hostname = g_strdup (host);
1475 clock = gst_ntp_clock_new (NULL, hostname, port, 0);
1478 } else if (g_str_has_prefix (ts_refclk, "ptp=IEEE1588-2008:")) {
1479 const gchar *domainstr =
1480 ts_refclk + sizeof ("ptp=IEEE1588-2008:XX-XX-XX-XX-XX-XX-XX-XX") - 1;
1483 if (domainstr[0] != ':' || sscanf (domainstr, ":%u", &domain) != 1)
1486 clock = gst_ptp_clock_new (NULL, domain);
1488 GST_FIXME_OBJECT (jitterbuffer, "Unsupported timestamp reference clock");
1491 if ((mediaclk = gst_structure_get_string (caps_struct, "a-mediaclk"))) {
1492 GST_DEBUG_OBJECT (jitterbuffer, "Got media clock %s", mediaclk);
1494 if (!g_str_has_prefix (mediaclk, "direct=")
1495 || sscanf (mediaclk, "direct=%" G_GUINT64_FORMAT, &clock_offset) != 1)
1496 GST_FIXME_OBJECT (jitterbuffer, "Unsupported media clock");
1497 if (strstr (mediaclk, "rate=") != NULL) {
1498 GST_FIXME_OBJECT (jitterbuffer, "Rate property not supported");
1503 rtp_jitter_buffer_set_media_clock (priv->jbuf, clock, clock_offset);
1505 rtp_jitter_buffer_set_media_clock (priv->jbuf, NULL, -1);
1513 GST_DEBUG_OBJECT (jitterbuffer, "No clock-rate in caps!");
1518 GST_DEBUG_OBJECT (jitterbuffer, "Invalid clock-rate %d", priv->clock_rate);
1524 gst_rtp_jitter_buffer_flush_start (GstRtpJitterBuffer * jitterbuffer)
1526 GstRtpJitterBufferPrivate *priv;
1528 priv = jitterbuffer->priv;
1531 /* mark ourselves as flushing */
1532 priv->srcresult = GST_FLOW_FLUSHING;
1533 GST_DEBUG_OBJECT (jitterbuffer, "Disabling pop on queue");
1534 /* this unblocks any waiting pops on the src pad task */
1535 JBUF_SIGNAL_EVENT (priv);
1536 JBUF_SIGNAL_QUERY (priv, FALSE);
1541 gst_rtp_jitter_buffer_flush_stop (GstRtpJitterBuffer * jitterbuffer)
1543 GstRtpJitterBufferPrivate *priv;
1545 priv = jitterbuffer->priv;
1548 GST_DEBUG_OBJECT (jitterbuffer, "Enabling pop on queue");
1549 /* Mark as non flushing */
1550 priv->srcresult = GST_FLOW_OK;
1551 gst_segment_init (&priv->segment, GST_FORMAT_TIME);
1552 priv->last_popped_seqnum = -1;
1553 priv->last_out_time = -1;
1554 priv->next_seqnum = -1;
1555 priv->seqnum_base = -1;
1556 priv->ips_rtptime = -1;
1557 priv->ips_pts = GST_CLOCK_TIME_NONE;
1558 priv->packet_spacing = 0;
1559 priv->next_in_seqnum = -1;
1560 priv->clock_rate = -1;
1563 priv->estimated_eos = -1;
1564 priv->last_elapsed = 0;
1565 priv->ext_timestamp = -1;
1566 priv->avg_jitter = 0;
1567 priv->last_dts = -1;
1568 priv->last_rtptime = -1;
1569 priv->last_in_pts = 0;
1570 priv->equidistant = 0;
1571 GST_DEBUG_OBJECT (jitterbuffer, "flush and reset jitterbuffer");
1572 rtp_jitter_buffer_flush (priv->jbuf, (GFunc) free_item, NULL);
1573 rtp_jitter_buffer_disable_buffering (priv->jbuf, FALSE);
1574 rtp_jitter_buffer_reset_skew (priv->jbuf);
1575 remove_all_timers (jitterbuffer);
1576 g_queue_foreach (&priv->gap_packets, (GFunc) gst_buffer_unref, NULL);
1577 g_queue_clear (&priv->gap_packets);
1582 gst_rtp_jitter_buffer_src_activate_mode (GstPad * pad, GstObject * parent,
1583 GstPadMode mode, gboolean active)
1586 GstRtpJitterBuffer *jitterbuffer = NULL;
1588 jitterbuffer = GST_RTP_JITTER_BUFFER (parent);
1591 case GST_PAD_MODE_PUSH:
1593 /* allow data processing */
1594 gst_rtp_jitter_buffer_flush_stop (jitterbuffer);
1596 /* start pushing out buffers */
1597 GST_DEBUG_OBJECT (jitterbuffer, "Starting task on srcpad");
1598 result = gst_pad_start_task (jitterbuffer->priv->srcpad,
1599 (GstTaskFunction) gst_rtp_jitter_buffer_loop, jitterbuffer, NULL);
1601 /* make sure all data processing stops ASAP */
1602 gst_rtp_jitter_buffer_flush_start (jitterbuffer);
1604 /* NOTE this will hardlock if the state change is called from the src pad
1605 * task thread because we will _join() the thread. */
1606 GST_DEBUG_OBJECT (jitterbuffer, "Stopping task on srcpad");
1607 result = gst_pad_stop_task (pad);
1617 static GstStateChangeReturn
1618 gst_rtp_jitter_buffer_change_state (GstElement * element,
1619 GstStateChange transition)
1621 GstRtpJitterBuffer *jitterbuffer;
1622 GstRtpJitterBufferPrivate *priv;
1623 GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
1625 jitterbuffer = GST_RTP_JITTER_BUFFER (element);
1626 priv = jitterbuffer->priv;
1628 switch (transition) {
1629 case GST_STATE_CHANGE_NULL_TO_READY:
1631 case GST_STATE_CHANGE_READY_TO_PAUSED:
1633 /* reset negotiated values */
1634 priv->clock_rate = -1;
1635 priv->clock_base = -1;
1636 priv->peer_latency = 0;
1638 /* block until we go to PLAYING */
1639 priv->blocked = TRUE;
1640 priv->timer_running = TRUE;
1641 priv->timer_thread =
1642 g_thread_new ("timer", (GThreadFunc) wait_next_timeout, jitterbuffer);
1645 case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
1647 /* unblock to allow streaming in PLAYING */
1648 priv->blocked = FALSE;
1649 JBUF_SIGNAL_EVENT (priv);
1650 JBUF_SIGNAL_TIMER (priv);
1657 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
1659 switch (transition) {
1660 case GST_STATE_CHANGE_READY_TO_PAUSED:
1661 /* we are a live element because we sync to the clock, which we can only
1662 * do in the PLAYING state */
1663 if (ret != GST_STATE_CHANGE_FAILURE)
1664 ret = GST_STATE_CHANGE_NO_PREROLL;
1666 case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
1668 /* block to stop streaming when PAUSED */
1669 priv->blocked = TRUE;
1670 unschedule_current_timer (jitterbuffer);
1672 if (ret != GST_STATE_CHANGE_FAILURE)
1673 ret = GST_STATE_CHANGE_NO_PREROLL;
1675 case GST_STATE_CHANGE_PAUSED_TO_READY:
1677 gst_buffer_replace (&priv->last_sr, NULL);
1678 priv->timer_running = FALSE;
1679 unschedule_current_timer (jitterbuffer);
1680 JBUF_SIGNAL_TIMER (priv);
1681 JBUF_SIGNAL_QUERY (priv, FALSE);
1683 g_thread_join (priv->timer_thread);
1684 priv->timer_thread = NULL;
1686 case GST_STATE_CHANGE_READY_TO_NULL:
1696 gst_rtp_jitter_buffer_src_event (GstPad * pad, GstObject * parent,
1699 gboolean ret = TRUE;
1700 GstRtpJitterBuffer *jitterbuffer;
1701 GstRtpJitterBufferPrivate *priv;
1703 jitterbuffer = GST_RTP_JITTER_BUFFER_CAST (parent);
1704 priv = jitterbuffer->priv;
1706 GST_DEBUG_OBJECT (jitterbuffer, "received %s", GST_EVENT_TYPE_NAME (event));
1708 switch (GST_EVENT_TYPE (event)) {
1709 case GST_EVENT_LATENCY:
1711 GstClockTime latency;
1713 gst_event_parse_latency (event, &latency);
1715 GST_DEBUG_OBJECT (jitterbuffer,
1716 "configuring latency of %" GST_TIME_FORMAT, GST_TIME_ARGS (latency));
1719 /* adjust the overall buffer delay to the total pipeline latency in
1720 * buffering mode because if downstream consumes too fast (because of
1721 * large latency or queues, we would start rebuffering again. */
1722 if (rtp_jitter_buffer_get_mode (priv->jbuf) ==
1723 RTP_JITTER_BUFFER_MODE_BUFFER) {
1724 rtp_jitter_buffer_set_delay (priv->jbuf, latency);
1728 ret = gst_pad_push_event (priv->sinkpad, event);
1732 ret = gst_pad_push_event (priv->sinkpad, event);
1739 /* handles and stores the event in the jitterbuffer, must be called with
1742 queue_event (GstRtpJitterBuffer * jitterbuffer, GstEvent * event)
1744 GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
1745 RTPJitterBufferItem *item;
1748 switch (GST_EVENT_TYPE (event)) {
1749 case GST_EVENT_CAPS:
1753 gst_event_parse_caps (event, &caps);
1754 gst_jitter_buffer_sink_parse_caps (jitterbuffer, caps, -1);
1757 case GST_EVENT_SEGMENT:
1760 gst_event_copy_segment (event, &segment);
1762 /* we need time for now */
1763 if (segment.format != GST_FORMAT_TIME) {
1764 GST_DEBUG_OBJECT (jitterbuffer, "ignoring non-TIME newsegment");
1765 gst_event_unref (event);
1767 gst_segment_init (&segment, GST_FORMAT_TIME);
1768 event = gst_event_new_segment (&segment);
1771 priv->segment = segment;
1776 rtp_jitter_buffer_disable_buffering (priv->jbuf, TRUE);
1783 GST_DEBUG_OBJECT (jitterbuffer, "adding event");
1784 item = alloc_item (event, ITEM_TYPE_EVENT, -1, -1, -1, 0, -1);
1785 rtp_jitter_buffer_insert (priv->jbuf, item, &head, NULL);
1787 JBUF_SIGNAL_EVENT (priv);
1793 gst_rtp_jitter_buffer_sink_event (GstPad * pad, GstObject * parent,
1796 gboolean ret = TRUE;
1797 GstRtpJitterBuffer *jitterbuffer;
1798 GstRtpJitterBufferPrivate *priv;
1800 jitterbuffer = GST_RTP_JITTER_BUFFER (parent);
1801 priv = jitterbuffer->priv;
1803 GST_DEBUG_OBJECT (jitterbuffer, "received %s", GST_EVENT_TYPE_NAME (event));
1805 switch (GST_EVENT_TYPE (event)) {
1806 case GST_EVENT_FLUSH_START:
1807 ret = gst_pad_push_event (priv->srcpad, event);
1808 gst_rtp_jitter_buffer_flush_start (jitterbuffer);
1809 /* wait for the loop to go into PAUSED */
1810 gst_pad_pause_task (priv->srcpad);
1812 case GST_EVENT_FLUSH_STOP:
1813 ret = gst_pad_push_event (priv->srcpad, event);
1815 gst_rtp_jitter_buffer_src_activate_mode (priv->srcpad, parent,
1816 GST_PAD_MODE_PUSH, TRUE);
1819 if (GST_EVENT_IS_SERIALIZED (event)) {
1820 /* serialized events go in the queue */
1822 if (priv->srcresult != GST_FLOW_OK) {
1823 /* Errors in sticky event pushing are no problem and ignored here
1824 * as they will cause more meaningful errors during data flow.
1825 * For EOS events, that are not followed by data flow, we still
1826 * return FALSE here though.
1828 if (!GST_EVENT_IS_STICKY (event) ||
1829 GST_EVENT_TYPE (event) == GST_EVENT_EOS)
1830 goto out_flow_error;
1832 /* refuse more events on EOS */
1835 ret = queue_event (jitterbuffer, event);
1838 /* non-serialized events are forwarded downstream immediately */
1839 ret = gst_pad_push_event (priv->srcpad, event);
1848 GST_DEBUG_OBJECT (jitterbuffer,
1849 "refusing event, we have a downstream flow error: %s",
1850 gst_flow_get_name (priv->srcresult));
1852 gst_event_unref (event);
1857 GST_DEBUG_OBJECT (jitterbuffer, "refusing event, we are EOS");
1859 gst_event_unref (event);
1865 gst_rtp_jitter_buffer_sink_rtcp_event (GstPad * pad, GstObject * parent,
1868 gboolean ret = TRUE;
1869 GstRtpJitterBuffer *jitterbuffer;
1871 jitterbuffer = GST_RTP_JITTER_BUFFER (parent);
1873 GST_DEBUG_OBJECT (jitterbuffer, "received %s", GST_EVENT_TYPE_NAME (event));
1875 switch (GST_EVENT_TYPE (event)) {
1876 case GST_EVENT_FLUSH_START:
1877 gst_event_unref (event);
1879 case GST_EVENT_FLUSH_STOP:
1880 gst_event_unref (event);
1883 ret = gst_pad_event_default (pad, parent, event);
1891 * Must be called with JBUF_LOCK held, will release the LOCK when emiting the
1892 * signal. The function returns GST_FLOW_ERROR when a parsing error happened and
1893 * GST_FLOW_FLUSHING when the element is shutting down. On success
1894 * GST_FLOW_OK is returned.
1896 static GstFlowReturn
1897 gst_rtp_jitter_buffer_get_clock_rate (GstRtpJitterBuffer * jitterbuffer,
1901 GValue args[2] = { {0}, {0} };
1905 g_value_init (&args[0], GST_TYPE_ELEMENT);
1906 g_value_set_object (&args[0], jitterbuffer);
1907 g_value_init (&args[1], G_TYPE_UINT);
1908 g_value_set_uint (&args[1], pt);
1910 g_value_init (&ret, GST_TYPE_CAPS);
1911 g_value_set_boxed (&ret, NULL);
1913 JBUF_UNLOCK (jitterbuffer->priv);
1914 g_signal_emitv (args, gst_rtp_jitter_buffer_signals[SIGNAL_REQUEST_PT_MAP], 0,
1916 JBUF_LOCK_CHECK (jitterbuffer->priv, out_flushing);
1918 g_value_unset (&args[0]);
1919 g_value_unset (&args[1]);
1920 caps = (GstCaps *) g_value_dup_boxed (&ret);
1921 g_value_unset (&ret);
1925 res = gst_jitter_buffer_sink_parse_caps (jitterbuffer, caps, pt);
1926 gst_caps_unref (caps);
1928 if (G_UNLIKELY (!res))
1936 GST_DEBUG_OBJECT (jitterbuffer, "could not get caps");
1937 return GST_FLOW_ERROR;
1941 GST_DEBUG_OBJECT (jitterbuffer, "we are flushing");
1942 return GST_FLOW_FLUSHING;
1946 GST_DEBUG_OBJECT (jitterbuffer, "parse failed");
1947 return GST_FLOW_ERROR;
1951 /* call with jbuf lock held */
1953 check_buffering_percent (GstRtpJitterBuffer * jitterbuffer, gint percent)
1955 GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
1956 GstMessage *message = NULL;
1961 /* Post a buffering message */
1962 if (priv->last_percent != percent) {
1963 priv->last_percent = percent;
1965 gst_message_new_buffering (GST_OBJECT_CAST (jitterbuffer), percent);
1966 gst_message_set_buffering_stats (message, GST_BUFFERING_LIVE, -1, -1, -1);
1973 apply_offset (GstRtpJitterBuffer * jitterbuffer, GstClockTime timestamp)
1975 GstRtpJitterBufferPrivate *priv;
1977 priv = jitterbuffer->priv;
1979 if (timestamp == -1)
1982 /* apply the timestamp offset, this is used for inter stream sync */
1983 timestamp += priv->ts_offset;
1984 /* add the offset, this is used when buffering */
1985 timestamp += priv->out_offset;
1991 timer_queue_new (void)
1995 queue = g_slice_new (TimerQueue);
1996 queue->timers = g_queue_new ();
1997 queue->hashtable = g_hash_table_new (NULL, NULL);
2003 timer_queue_free (TimerQueue * queue)
2008 g_hash_table_destroy (queue->hashtable);
2009 g_queue_free_full (queue->timers, g_free);
2010 g_slice_free (TimerQueue, queue);
2014 timer_queue_append (TimerQueue * queue, const TimerData * timer,
2015 GstClockTime timeout, gboolean lost)
2019 copy = g_memdup (timer, sizeof (*timer));
2020 copy->timeout = timeout;
2021 copy->type = lost ? TIMER_TYPE_LOST : TIMER_TYPE_EXPECTED;
2024 GST_LOG ("Append rtx-stats timer #%d, %" GST_TIME_FORMAT,
2025 copy->seqnum, GST_TIME_ARGS (copy->timeout));
2026 g_queue_push_tail (queue->timers, copy);
2027 g_hash_table_insert (queue->hashtable, GINT_TO_POINTER (copy->seqnum), copy);
2031 timer_queue_clear_until (TimerQueue * queue, GstClockTime timeout)
2035 test = g_queue_peek_head (queue->timers);
2036 while (test && test->timeout < timeout) {
2037 GST_LOG ("Pop rtx-stats timer #%d, %" GST_TIME_FORMAT " < %"
2038 GST_TIME_FORMAT, test->seqnum, GST_TIME_ARGS (test->timeout),
2039 GST_TIME_ARGS (timeout));
2040 g_hash_table_remove (queue->hashtable, GINT_TO_POINTER (test->seqnum));
2041 g_free (g_queue_pop_head (queue->timers));
2042 test = g_queue_peek_head (queue->timers);
2047 timer_queue_find (TimerQueue * queue, guint16 seqnum)
2049 return g_hash_table_lookup (queue->hashtable, GINT_TO_POINTER (seqnum));
2053 find_timer (GstRtpJitterBuffer * jitterbuffer, guint16 seqnum)
2055 GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
2056 TimerData *timer = NULL;
2059 len = priv->timers->len;
2060 for (i = 0; i < len; i++) {
2061 TimerData *test = &g_array_index (priv->timers, TimerData, i);
2062 if (test->seqnum == seqnum) {
2071 unschedule_current_timer (GstRtpJitterBuffer * jitterbuffer)
2073 GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
2075 if (priv->clock_id) {
2076 GST_DEBUG_OBJECT (jitterbuffer, "unschedule current timer");
2077 gst_clock_id_unschedule (priv->clock_id);
2078 priv->clock_id = NULL;
2083 get_timeout (GstRtpJitterBuffer * jitterbuffer, TimerData * timer)
2085 GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
2086 GstClockTime test_timeout;
2088 if ((test_timeout = timer->timeout) == -1)
2091 if (timer->type != TIMER_TYPE_EXPECTED) {
2092 /* add our latency and offset to get output times. */
2093 test_timeout = apply_offset (jitterbuffer, test_timeout);
2094 test_timeout += priv->latency_ns;
2096 return test_timeout;
2100 recalculate_timer (GstRtpJitterBuffer * jitterbuffer, TimerData * timer)
2102 GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
2104 if (priv->clock_id) {
2105 GstClockTime timeout = get_timeout (jitterbuffer, timer);
2107 GST_DEBUG ("%" GST_TIME_FORMAT " <> %" GST_TIME_FORMAT,
2108 GST_TIME_ARGS (timeout), GST_TIME_ARGS (priv->timer_timeout));
2110 if (timeout == -1 || timeout < priv->timer_timeout)
2111 unschedule_current_timer (jitterbuffer);
2116 add_timer (GstRtpJitterBuffer * jitterbuffer, TimerType type,
2117 guint16 seqnum, guint num, GstClockTime timeout, GstClockTime delay,
2118 GstClockTime duration)
2120 GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
2124 GST_DEBUG_OBJECT (jitterbuffer,
2125 "add timer %d for seqnum %d to %" GST_TIME_FORMAT ", delay %"
2126 GST_TIME_FORMAT, type, seqnum, GST_TIME_ARGS (timeout),
2127 GST_TIME_ARGS (delay));
2129 len = priv->timers->len;
2130 g_array_set_size (priv->timers, len + 1);
2131 timer = &g_array_index (priv->timers, TimerData, len);
2134 timer->seqnum = seqnum;
2136 timer->timeout = timeout + delay;
2137 timer->duration = duration;
2138 if (type == TIMER_TYPE_EXPECTED) {
2139 timer->rtx_base = timeout;
2140 timer->rtx_delay = delay;
2141 timer->rtx_retry = 0;
2143 timer->rtx_last = GST_CLOCK_TIME_NONE;
2144 timer->num_rtx_retry = 0;
2145 timer->num_rtx_received = 0;
2146 recalculate_timer (jitterbuffer, timer);
2147 JBUF_SIGNAL_TIMER (priv);
2153 reschedule_timer (GstRtpJitterBuffer * jitterbuffer, TimerData * timer,
2154 guint16 seqnum, GstClockTime timeout, GstClockTime delay, gboolean reset)
2156 GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
2157 gboolean seqchange, timechange;
2159 GstClockTime new_timeout;
2161 oldseq = timer->seqnum;
2162 new_timeout = timeout + delay;
2163 seqchange = oldseq != seqnum;
2164 timechange = timer->timeout != new_timeout;
2166 if (!seqchange && !timechange) {
2167 GST_DEBUG_OBJECT (jitterbuffer,
2168 "No changes in seqnum (%d) and timeout (%" GST_TIME_FORMAT
2169 "), skipping", oldseq, GST_TIME_ARGS (timer->timeout));
2173 GST_DEBUG_OBJECT (jitterbuffer,
2174 "replace timer %d for seqnum %d->%d timeout %" GST_TIME_FORMAT
2175 "->%" GST_TIME_FORMAT, timer->type, oldseq, seqnum,
2176 GST_TIME_ARGS (timer->timeout), GST_TIME_ARGS (new_timeout));
2178 timer->timeout = new_timeout;
2179 timer->seqnum = seqnum;
2181 GST_DEBUG_OBJECT (jitterbuffer, "reset rtx delay %" GST_TIME_FORMAT
2182 "->%" GST_TIME_FORMAT, GST_TIME_ARGS (timer->rtx_delay),
2183 GST_TIME_ARGS (delay));
2184 timer->rtx_base = timeout;
2185 timer->rtx_delay = delay;
2186 timer->rtx_retry = 0;
2189 timer->num_rtx_retry = 0;
2190 timer->num_rtx_received = 0;
2193 if (priv->clock_id) {
2194 /* we changed the seqnum and there is a timer currently waiting with this
2195 * seqnum, unschedule it */
2196 if (seqchange && priv->timer_seqnum == oldseq)
2197 unschedule_current_timer (jitterbuffer);
2198 /* we changed the time, check if it is earlier than what we are waiting
2199 * for and unschedule if so */
2200 else if (timechange)
2201 recalculate_timer (jitterbuffer, timer);
2206 set_timer (GstRtpJitterBuffer * jitterbuffer, TimerType type,
2207 guint16 seqnum, GstClockTime timeout)
2211 /* find the seqnum timer */
2212 timer = find_timer (jitterbuffer, seqnum);
2213 if (timer == NULL) {
2214 timer = add_timer (jitterbuffer, type, seqnum, 0, timeout, 0, -1);
2216 reschedule_timer (jitterbuffer, timer, seqnum, timeout, 0, FALSE);
2222 remove_timer (GstRtpJitterBuffer * jitterbuffer, TimerData * timer)
2224 GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
2227 if (timer->idx == -1)
2230 if (priv->clock_id && priv->timer_seqnum == timer->seqnum)
2231 unschedule_current_timer (jitterbuffer);
2234 GST_DEBUG_OBJECT (jitterbuffer, "removed index %d", idx);
2235 g_array_remove_index_fast (priv->timers, idx);
2240 remove_all_timers (GstRtpJitterBuffer * jitterbuffer)
2242 GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
2243 GST_DEBUG_OBJECT (jitterbuffer, "removed all timers");
2244 g_array_set_size (priv->timers, 0);
2245 unschedule_current_timer (jitterbuffer);
2248 /* get the extra delay to wait before sending RTX */
2250 get_rtx_delay (GstRtpJitterBufferPrivate * priv)
2254 if (priv->rtx_delay == -1) {
2255 if (priv->avg_jitter == 0 && priv->packet_spacing == 0) {
2256 delay = DEFAULT_AUTO_RTX_DELAY;
2258 /* jitter is in nanoseconds, maximum of 2x jitter and half the
2259 * packet spacing is a good margin */
2260 delay = MAX (priv->avg_jitter * 2, priv->packet_spacing / 2);
2263 delay = priv->rtx_delay * GST_MSECOND;
2265 if (priv->rtx_min_delay > 0)
2266 delay = MAX (delay, priv->rtx_min_delay * GST_MSECOND);
2271 /* Check if packet with seqnum is already considered definitely lost by being
2272 * part of a "lost timer" for multiple packets */
2274 already_lost (GstRtpJitterBuffer * jitterbuffer, guint16 seqnum)
2276 GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
2279 len = priv->timers->len;
2280 for (i = 0; i < len; i++) {
2281 TimerData *test = &g_array_index (priv->timers, TimerData, i);
2282 gint gap = gst_rtp_buffer_compare_seqnum (test->seqnum, seqnum);
2284 if (test->num > 1 && test->type == TIMER_TYPE_LOST && gap >= 0 &&
2286 GST_DEBUG ("seqnum #%d already considered definitely lost (#%d->#%d)",
2287 seqnum, test->seqnum, (test->seqnum + test->num - 1) & 0xffff);
2295 /* we just received a packet with seqnum and dts.
2297 * First check for old seqnum that we are still expecting. If the gap with the
2298 * current seqnum is too big, unschedule the timeouts.
2300 * If we have a valid packet spacing estimate we can set a timer for when we
2301 * should receive the next packet.
2302 * If we don't have a valid estimate, we remove any timer we might have
2303 * had for this packet.
2306 update_timers (GstRtpJitterBuffer * jitterbuffer, guint16 seqnum,
2307 GstClockTime dts, GstClockTime pts, gboolean do_next_seqnum,
2308 gboolean is_rtx, TimerData * timer)
2310 GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
2312 /* go through all timers and unschedule the ones with a large gap */
2313 if (priv->do_retransmission && priv->rtx_delay_reorder > 0) {
2315 len = priv->timers->len;
2316 for (i = 0; i < len; i++) {
2317 TimerData *test = &g_array_index (priv->timers, TimerData, i);
2320 gap = gst_rtp_buffer_compare_seqnum (test->seqnum, seqnum);
2322 GST_DEBUG_OBJECT (jitterbuffer, "%d, #%d<->#%d gap %d",
2323 test->type, test->seqnum, seqnum, gap);
2325 if (gap > priv->rtx_delay_reorder) {
2326 /* max gap, we exceeded the max reorder distance and we don't expect the
2327 * missing packet to be this reordered */
2328 if (test->num_rtx_retry == 0 && test->type == TIMER_TYPE_EXPECTED)
2329 reschedule_timer (jitterbuffer, test, test->seqnum, -1, 0, FALSE);
2334 do_next_seqnum = do_next_seqnum && priv->packet_spacing > 0
2335 && priv->do_retransmission && priv->rtx_next_seqnum;
2337 if (timer && timer->type != TIMER_TYPE_DEADLINE) {
2338 if (timer->num_rtx_retry > 0) {
2340 update_rtx_stats (jitterbuffer, timer, dts, TRUE);
2341 /* don't try to estimate the next seqnum because this is a retransmitted
2342 * packet and it probably did not arrive with the expected packet
2344 do_next_seqnum = FALSE;
2347 if (!is_rtx || timer->num_rtx_retry > 1) {
2348 /* Store timer in order to record stats when/if the retransmitted
2349 * packet arrives. We should also store timer information if we've
2350 * requested retransmission more than once since we may receive
2351 * several retransmitted packets. For accuracy we should update the
2352 * stats also when the redundant retransmitted packets arrives. */
2353 timer_queue_append (priv->rtx_stats_timers, timer,
2354 pts + priv->rtx_stats_timeout * GST_MSECOND, FALSE);
2359 if (do_next_seqnum && pts != GST_CLOCK_TIME_NONE) {
2360 GstClockTime expected, delay;
2362 /* calculate expected arrival time of the next seqnum */
2363 expected = pts + priv->packet_spacing;
2365 delay = get_rtx_delay (priv);
2367 /* and update/install timer for next seqnum */
2368 GST_DEBUG_OBJECT (jitterbuffer, "Add RTX timer #%d, expected %"
2369 GST_TIME_FORMAT ", delay %" GST_TIME_FORMAT ", packet-spacing %"
2370 GST_TIME_FORMAT ", jitter %" GST_TIME_FORMAT, priv->next_in_seqnum,
2371 GST_TIME_ARGS (expected), GST_TIME_ARGS (delay),
2372 GST_TIME_ARGS (priv->packet_spacing), GST_TIME_ARGS (priv->avg_jitter));
2375 timer->type = TIMER_TYPE_EXPECTED;
2376 reschedule_timer (jitterbuffer, timer, priv->next_in_seqnum, expected,
2379 add_timer (jitterbuffer, TIMER_TYPE_EXPECTED, priv->next_in_seqnum, 0,
2380 expected, delay, priv->packet_spacing);
2382 } else if (timer && timer->type != TIMER_TYPE_DEADLINE) {
2383 /* if we had a timer, remove it, we don't know when to expect the next
2385 remove_timer (jitterbuffer, timer);
2390 calculate_packet_spacing (GstRtpJitterBuffer * jitterbuffer, guint32 rtptime,
2393 GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
2395 /* we need consecutive seqnums with a different
2396 * rtptime to estimate the packet spacing. */
2397 if (priv->ips_rtptime != rtptime) {
2398 /* rtptime changed, check pts diff */
2399 if (priv->ips_pts != -1 && pts != -1 && pts > priv->ips_pts) {
2400 GstClockTime new_packet_spacing = pts - priv->ips_pts;
2401 GstClockTime old_packet_spacing = priv->packet_spacing;
2403 /* Biased towards bigger packet spacings to prevent
2404 * too many unneeded retransmission requests for next
2405 * packets that just arrive a little later than we would
2407 if (old_packet_spacing > new_packet_spacing)
2408 priv->packet_spacing =
2409 (new_packet_spacing + 3 * old_packet_spacing) / 4;
2410 else if (old_packet_spacing > 0)
2411 priv->packet_spacing =
2412 (3 * new_packet_spacing + old_packet_spacing) / 4;
2414 priv->packet_spacing = new_packet_spacing;
2416 GST_DEBUG_OBJECT (jitterbuffer,
2417 "new packet spacing %" GST_TIME_FORMAT
2418 " old packet spacing %" GST_TIME_FORMAT
2419 " combined to %" GST_TIME_FORMAT,
2420 GST_TIME_ARGS (new_packet_spacing),
2421 GST_TIME_ARGS (old_packet_spacing),
2422 GST_TIME_ARGS (priv->packet_spacing));
2424 priv->ips_rtptime = rtptime;
2425 priv->ips_pts = pts;
2430 calculate_expected (GstRtpJitterBuffer * jitterbuffer, guint32 expected,
2431 guint16 seqnum, GstClockTime pts, gint gap)
2433 GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
2434 GstClockTime duration, expected_pts, delay;
2436 gboolean equidistant = priv->equidistant > 0;
2438 GST_DEBUG_OBJECT (jitterbuffer,
2439 "pts %" GST_TIME_FORMAT ", last %" GST_TIME_FORMAT,
2440 GST_TIME_ARGS (pts), GST_TIME_ARGS (priv->last_in_pts));
2442 if (pts == GST_CLOCK_TIME_NONE) {
2443 GST_WARNING_OBJECT (jitterbuffer, "Have no PTS");
2448 GstClockTime total_duration;
2449 /* the total duration spanned by the missing packets */
2450 if (pts >= priv->last_in_pts)
2451 total_duration = pts - priv->last_in_pts;
2455 /* interpolate between the current time and the last time based on
2456 * number of packets we are missing, this is the estimated duration
2457 * for the missing packet based on equidistant packet spacing. */
2458 duration = total_duration / (gap + 1);
2460 GST_DEBUG_OBJECT (jitterbuffer, "duration %" GST_TIME_FORMAT,
2461 GST_TIME_ARGS (duration));
2463 if (total_duration > priv->latency_ns) {
2464 GstClockTime gap_time;
2468 GstClockTime gap_dur = gap * duration;
2469 if (gap_dur > priv->latency_ns)
2470 gap_time = gap_dur - priv->latency_ns;
2473 lost_packets = gap_time / duration;
2475 gap_time = total_duration - priv->latency_ns;
2479 /* too many lost packets, some of the missing packets are already
2480 * too late and we can generate lost packet events for them. */
2481 GST_INFO_OBJECT (jitterbuffer,
2482 "lost packets (%d, #%d->#%d) duration too large %" GST_TIME_FORMAT
2483 " > %" GST_TIME_FORMAT ", consider %u lost (%" GST_TIME_FORMAT ")",
2484 gap, expected, seqnum - 1, GST_TIME_ARGS (total_duration),
2485 GST_TIME_ARGS (priv->latency_ns), lost_packets,
2486 GST_TIME_ARGS (gap_time));
2488 /* this timer will fire immediately and the lost event will be pushed from
2489 * the timer thread */
2490 if (lost_packets > 0) {
2491 add_timer (jitterbuffer, TIMER_TYPE_LOST, expected, lost_packets,
2492 priv->last_in_pts + duration, 0, gap_time);
2493 expected += lost_packets;
2494 priv->last_in_pts += gap_time;
2498 expected_pts = priv->last_in_pts + duration;
2500 /* If we cannot assume equidistant packet spacing, the only thing we now
2501 * for sure is that the missing packets have expected pts not later than
2502 * the last received pts. */
2509 if (priv->do_retransmission) {
2510 TimerData *timer = find_timer (jitterbuffer, expected);
2512 type = TIMER_TYPE_EXPECTED;
2513 delay = get_rtx_delay (priv);
2515 /* if we had a timer for the first missing packet, update it. */
2516 if (timer && timer->type == TIMER_TYPE_EXPECTED) {
2517 GstClockTime timeout = timer->timeout;
2519 timer->duration = duration;
2520 if (timeout > (expected_pts + delay) && timer->num_rtx_retry == 0) {
2521 reschedule_timer (jitterbuffer, timer, timer->seqnum, expected_pts,
2525 expected_pts += duration;
2528 type = TIMER_TYPE_LOST;
2531 while (gst_rtp_buffer_compare_seqnum (expected, seqnum) > 0) {
2532 add_timer (jitterbuffer, type, expected, 0, expected_pts, delay, duration);
2533 expected_pts += duration;
2539 calculate_jitter (GstRtpJitterBuffer * jitterbuffer, GstClockTime dts,
2543 GstClockTimeDiff dtsdiff, rtpdiffns, diff;
2544 GstRtpJitterBufferPrivate *priv;
2546 priv = jitterbuffer->priv;
2548 if (G_UNLIKELY (dts == GST_CLOCK_TIME_NONE) || priv->clock_rate <= 0)
2551 if (priv->last_dts != -1)
2552 dtsdiff = dts - priv->last_dts;
2556 if (priv->last_rtptime != -1)
2557 rtpdiff = rtptime - (guint32) priv->last_rtptime;
2561 /* Guess whether stream currently uses equidistant packet spacing. If we
2562 * often see identical timestamps it means the packets are not
2564 if (rtptime == priv->last_rtptime)
2565 priv->equidistant -= 2;
2567 priv->equidistant += 1;
2568 priv->equidistant = CLAMP (priv->equidistant, -7, 7);
2570 priv->last_dts = dts;
2571 priv->last_rtptime = rtptime;
2575 gst_util_uint64_scale_int (rtpdiff, GST_SECOND, priv->clock_rate);
2578 -gst_util_uint64_scale_int (-rtpdiff, GST_SECOND, priv->clock_rate);
2580 diff = ABS (dtsdiff - rtpdiffns);
2582 /* jitter is stored in nanoseconds */
2583 priv->avg_jitter = (diff + (15 * priv->avg_jitter)) >> 4;
2585 GST_LOG_OBJECT (jitterbuffer,
2586 "dtsdiff %" GST_TIME_FORMAT " rtptime %" GST_TIME_FORMAT
2587 ", clock-rate %d, diff %" GST_TIME_FORMAT ", jitter: %" GST_TIME_FORMAT,
2588 GST_TIME_ARGS (dtsdiff), GST_TIME_ARGS (rtpdiffns), priv->clock_rate,
2589 GST_TIME_ARGS (diff), GST_TIME_ARGS (priv->avg_jitter));
2596 GST_DEBUG_OBJECT (jitterbuffer,
2597 "no dts or no clock-rate, can't calculate jitter");
2603 compare_buffer_seqnum (GstBuffer * a, GstBuffer * b, gpointer user_data)
2605 GstRTPBuffer rtp_a = GST_RTP_BUFFER_INIT;
2606 GstRTPBuffer rtp_b = GST_RTP_BUFFER_INIT;
2609 gst_rtp_buffer_map (a, GST_MAP_READ, &rtp_a);
2610 seq_a = gst_rtp_buffer_get_seq (&rtp_a);
2611 gst_rtp_buffer_unmap (&rtp_a);
2613 gst_rtp_buffer_map (b, GST_MAP_READ, &rtp_b);
2614 seq_b = gst_rtp_buffer_get_seq (&rtp_b);
2615 gst_rtp_buffer_unmap (&rtp_b);
2617 return gst_rtp_buffer_compare_seqnum (seq_b, seq_a);
2621 handle_big_gap_buffer (GstRtpJitterBuffer * jitterbuffer, GstBuffer * buffer,
2622 guint8 pt, guint16 seqnum, gint gap, guint max_dropout, guint max_misorder)
2624 GstRtpJitterBufferPrivate *priv;
2625 guint gap_packets_length;
2626 gboolean reset = FALSE;
2627 gboolean future = gap > 0;
2629 priv = jitterbuffer->priv;
2631 if ((gap_packets_length = g_queue_get_length (&priv->gap_packets)) > 0) {
2633 guint32 prev_gap_seq = -1;
2634 gboolean all_consecutive = TRUE;
2636 g_queue_insert_sorted (&priv->gap_packets, buffer,
2637 (GCompareDataFunc) compare_buffer_seqnum, NULL);
2639 for (l = priv->gap_packets.head; l; l = l->next) {
2640 GstBuffer *gap_buffer = l->data;
2641 GstRTPBuffer gap_rtp = GST_RTP_BUFFER_INIT;
2644 gst_rtp_buffer_map (gap_buffer, GST_MAP_READ, &gap_rtp);
2646 all_consecutive = (gst_rtp_buffer_get_payload_type (&gap_rtp) == pt);
2648 gap_seq = gst_rtp_buffer_get_seq (&gap_rtp);
2649 if (prev_gap_seq == -1)
2650 prev_gap_seq = gap_seq;
2651 else if (gst_rtp_buffer_compare_seqnum (gap_seq, prev_gap_seq) != -1)
2652 all_consecutive = FALSE;
2654 prev_gap_seq = gap_seq;
2656 gst_rtp_buffer_unmap (&gap_rtp);
2657 if (!all_consecutive)
2661 if (all_consecutive && gap_packets_length > 3) {
2662 GST_DEBUG_OBJECT (jitterbuffer,
2663 "buffer too %s %d < %d, got 5 consecutive ones - reset",
2664 (future ? "new" : "old"), gap,
2665 (future ? max_dropout : -max_misorder));
2667 } else if (!all_consecutive) {
2668 g_queue_foreach (&priv->gap_packets, (GFunc) gst_buffer_unref, NULL);
2669 g_queue_clear (&priv->gap_packets);
2670 GST_DEBUG_OBJECT (jitterbuffer,
2671 "buffer too %s %d < %d, got no 5 consecutive ones - dropping",
2672 (future ? "new" : "old"), gap,
2673 (future ? max_dropout : -max_misorder));
2676 GST_DEBUG_OBJECT (jitterbuffer,
2677 "buffer too %s %d < %d, got %u consecutive ones - waiting",
2678 (future ? "new" : "old"), gap,
2679 (future ? max_dropout : -max_misorder), gap_packets_length + 1);
2683 GST_DEBUG_OBJECT (jitterbuffer,
2684 "buffer too %s %d < %d, first one - waiting", (future ? "new" : "old"),
2685 gap, -max_misorder);
2686 g_queue_push_tail (&priv->gap_packets, buffer);
2694 get_current_running_time (GstRtpJitterBuffer * jitterbuffer)
2696 GstClock *clock = gst_element_get_clock (GST_ELEMENT_CAST (jitterbuffer));
2697 GstClockTime running_time = GST_CLOCK_TIME_NONE;
2700 GstClockTime base_time =
2701 gst_element_get_base_time (GST_ELEMENT_CAST (jitterbuffer));
2702 GstClockTime clock_time = gst_clock_get_time (clock);
2704 if (clock_time > base_time)
2705 running_time = clock_time - base_time;
2709 gst_object_unref (clock);
2712 return running_time;
2715 static GstFlowReturn
2716 gst_rtp_jitter_buffer_reset (GstRtpJitterBuffer * jitterbuffer,
2717 GstPad * pad, GstObject * parent, guint16 seqnum)
2719 GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
2720 GstFlowReturn ret = GST_FLOW_OK;
2721 GList *events = NULL, *l;
2725 GST_DEBUG_OBJECT (jitterbuffer, "flush and reset jitterbuffer");
2726 rtp_jitter_buffer_flush (priv->jbuf,
2727 (GFunc) free_item_and_retain_events, &events);
2728 rtp_jitter_buffer_reset_skew (priv->jbuf);
2729 remove_all_timers (jitterbuffer);
2730 priv->discont = TRUE;
2731 priv->last_popped_seqnum = -1;
2733 if (priv->gap_packets.head) {
2734 GstBuffer *gap_buffer = priv->gap_packets.head->data;
2735 GstRTPBuffer gap_rtp = GST_RTP_BUFFER_INIT;
2737 gst_rtp_buffer_map (gap_buffer, GST_MAP_READ, &gap_rtp);
2738 priv->next_seqnum = gst_rtp_buffer_get_seq (&gap_rtp);
2739 gst_rtp_buffer_unmap (&gap_rtp);
2741 priv->next_seqnum = seqnum;
2744 priv->last_in_pts = -1;
2745 priv->next_in_seqnum = -1;
2747 /* Insert all sticky events again in order, otherwise we would
2748 * potentially loose STREAM_START, CAPS or SEGMENT events
2750 events = g_list_reverse (events);
2751 for (l = events; l; l = l->next) {
2752 RTPJitterBufferItem *item;
2754 item = alloc_item (l->data, ITEM_TYPE_EVENT, -1, -1, -1, 0, -1);
2755 rtp_jitter_buffer_insert (priv->jbuf, item, &head, NULL);
2757 g_list_free (events);
2759 JBUF_SIGNAL_EVENT (priv);
2761 /* reset spacing estimation when gap */
2762 priv->ips_rtptime = -1;
2763 priv->ips_pts = GST_CLOCK_TIME_NONE;
2765 buffers = g_list_copy (priv->gap_packets.head);
2766 g_queue_clear (&priv->gap_packets);
2768 priv->ips_rtptime = -1;
2769 priv->ips_pts = GST_CLOCK_TIME_NONE;
2770 JBUF_UNLOCK (jitterbuffer->priv);
2772 for (l = buffers; l; l = l->next) {
2773 ret = gst_rtp_jitter_buffer_chain (pad, parent, l->data);
2775 if (ret != GST_FLOW_OK) {
2780 for (; l; l = l->next)
2781 gst_buffer_unref (l->data);
2782 g_list_free (buffers);
2787 static GstFlowReturn
2788 gst_rtp_jitter_buffer_chain (GstPad * pad, GstObject * parent,
2791 GstRtpJitterBuffer *jitterbuffer;
2792 GstRtpJitterBufferPrivate *priv;
2794 guint32 expected, rtptime;
2795 GstFlowReturn ret = GST_FLOW_OK;
2796 GstClockTime dts, pts;
2801 GstRTPBuffer rtp = GST_RTP_BUFFER_INIT;
2802 gboolean do_next_seqnum = FALSE;
2803 RTPJitterBufferItem *item;
2804 GstMessage *msg = NULL;
2805 gboolean estimated_dts = FALSE;
2806 gint32 packet_rate, max_dropout, max_misorder;
2807 TimerData *timer = NULL;
2809 jitterbuffer = GST_RTP_JITTER_BUFFER_CAST (parent);
2811 priv = jitterbuffer->priv;
2813 if (G_UNLIKELY (!gst_rtp_buffer_map (buffer, GST_MAP_READ, &rtp)))
2814 goto invalid_buffer;
2816 pt = gst_rtp_buffer_get_payload_type (&rtp);
2817 seqnum = gst_rtp_buffer_get_seq (&rtp);
2818 rtptime = gst_rtp_buffer_get_timestamp (&rtp);
2819 gst_rtp_buffer_unmap (&rtp);
2821 /* make sure we have PTS and DTS set */
2822 pts = GST_BUFFER_PTS (buffer);
2823 dts = GST_BUFFER_DTS (buffer);
2830 /* If we have no DTS here, i.e. no capture time, get one from the
2831 * clock now to have something to calculate with in the future. */
2832 dts = get_current_running_time (jitterbuffer);
2835 /* Remember that we estimated the DTS if we are running already
2836 * and this is not our first packet (or first packet after a reset).
2837 * If it's the first packet, we somehow must generate a timestamp for
2838 * everything, otherwise we can't calculate any times
2840 estimated_dts = (priv->next_in_seqnum != -1);
2842 /* take the DTS of the buffer. This is the time when the packet was
2843 * received and is used to calculate jitter and clock skew. We will adjust
2844 * this DTS with the smoothed value after processing it in the
2845 * jitterbuffer and assign it as the PTS. */
2846 /* bring to running time */
2847 dts = gst_segment_to_running_time (&priv->segment, GST_FORMAT_TIME, dts);
2850 GST_DEBUG_OBJECT (jitterbuffer,
2851 "Received packet #%d at time %" GST_TIME_FORMAT ", discont %d, rtx %d",
2852 seqnum, GST_TIME_ARGS (dts), GST_BUFFER_IS_DISCONT (buffer),
2853 GST_BUFFER_IS_RETRANSMISSION (buffer));
2855 JBUF_LOCK_CHECK (priv, out_flushing);
2857 if (G_UNLIKELY (priv->last_pt != pt)) {
2860 GST_DEBUG_OBJECT (jitterbuffer, "pt changed from %u to %u", priv->last_pt,
2864 /* reset clock-rate so that we get a new one */
2865 priv->clock_rate = -1;
2867 /* Try to get the clock-rate from the caps first if we can. If there are no
2868 * caps we must fire the signal to get the clock-rate. */
2869 if ((caps = gst_pad_get_current_caps (pad))) {
2870 gst_jitter_buffer_sink_parse_caps (jitterbuffer, caps, pt);
2871 gst_caps_unref (caps);
2875 if (G_UNLIKELY (priv->clock_rate == -1)) {
2876 /* no clock rate given on the caps, try to get one with the signal */
2877 if (gst_rtp_jitter_buffer_get_clock_rate (jitterbuffer,
2878 pt) == GST_FLOW_FLUSHING)
2881 if (G_UNLIKELY (priv->clock_rate == -1))
2884 gst_rtp_packet_rate_ctx_reset (&priv->packet_rate_ctx, priv->clock_rate);
2887 /* don't accept more data on EOS */
2888 if (G_UNLIKELY (priv->eos))
2891 if (!GST_BUFFER_IS_RETRANSMISSION (buffer))
2892 calculate_jitter (jitterbuffer, dts, rtptime);
2894 if (priv->seqnum_base != -1) {
2897 gap = gst_rtp_buffer_compare_seqnum (priv->seqnum_base, seqnum);
2900 GST_DEBUG_OBJECT (jitterbuffer,
2901 "packet seqnum #%d before seqnum-base #%d", seqnum,
2903 gst_buffer_unref (buffer);
2905 } else if (gap > 16384) {
2906 /* From now on don't compare against the seqnum base anymore as
2907 * at some point in the future we will wrap around and also that
2908 * much reordering is very unlikely */
2909 priv->seqnum_base = -1;
2913 expected = priv->next_in_seqnum;
2916 gst_rtp_packet_rate_ctx_update (&priv->packet_rate_ctx, seqnum, rtptime);
2918 gst_rtp_packet_rate_ctx_get_max_dropout (&priv->packet_rate_ctx,
2919 priv->max_dropout_time);
2921 gst_rtp_packet_rate_ctx_get_max_misorder (&priv->packet_rate_ctx,
2922 priv->max_misorder_time);
2923 GST_TRACE_OBJECT (jitterbuffer,
2924 "packet_rate: %d, max_dropout: %d, max_misorder: %d", packet_rate,
2925 max_dropout, max_misorder);
2927 /* now check against our expected seqnum */
2928 if (G_UNLIKELY (expected == -1)) {
2929 GST_DEBUG_OBJECT (jitterbuffer, "First buffer #%d", seqnum);
2931 /* calculate a pts based on rtptime and arrival time (dts) */
2932 pts = rtp_jitter_buffer_calculate_pts (priv->jbuf, dts, rtptime,
2933 gst_element_get_base_time (GST_ELEMENT_CAST (jitterbuffer)));
2935 /* we don't know what the next_in_seqnum should be, wait for the last
2936 * possible moment to push this buffer, maybe we get an earlier seqnum
2938 set_timer (jitterbuffer, TIMER_TYPE_DEADLINE, seqnum, pts);
2940 do_next_seqnum = TRUE;
2941 /* take rtptime and pts to calculate packet spacing */
2942 priv->ips_rtptime = rtptime;
2943 priv->ips_pts = pts;
2947 /* now calculate gap */
2948 gap = gst_rtp_buffer_compare_seqnum (expected, seqnum);
2949 GST_DEBUG_OBJECT (jitterbuffer, "expected #%d, got #%d, gap of %d",
2950 expected, seqnum, gap);
2952 if (G_UNLIKELY (gap > 0 && priv->timers->len >= max_dropout)) {
2953 /* If we have timers for more than RTP_MAX_DROPOUT packets
2954 * pending this means that we have a huge gap overall. We can
2955 * reset the jitterbuffer at this point because there's
2956 * just too much data missing to be able to do anything
2957 * sensible with the past data. Just try again from the
2959 GST_WARNING_OBJECT (jitterbuffer, "%d pending timers > %d - resetting",
2960 priv->timers->len, max_dropout);
2961 gst_buffer_unref (buffer);
2962 return gst_rtp_jitter_buffer_reset (jitterbuffer, pad, parent, seqnum);
2965 /* Special handling of large gaps */
2966 if ((gap != -1 && gap < -max_misorder) || (gap >= max_dropout)) {
2967 gboolean reset = handle_big_gap_buffer (jitterbuffer, buffer, pt, seqnum,
2968 gap, max_dropout, max_misorder);
2970 return gst_rtp_jitter_buffer_reset (jitterbuffer, pad, parent, seqnum);
2972 GST_DEBUG_OBJECT (jitterbuffer,
2973 "Had big gap, waiting for more consecutive packets");
2978 /* We had no huge gap, let's drop all the gap packets */
2979 GST_DEBUG_OBJECT (jitterbuffer, "Clearing gap packets");
2980 g_queue_foreach (&priv->gap_packets, (GFunc) gst_buffer_unref, NULL);
2981 g_queue_clear (&priv->gap_packets);
2983 /* calculate a pts based on rtptime and arrival time (dts) */
2984 pts = rtp_jitter_buffer_calculate_pts (priv->jbuf, dts, rtptime,
2985 gst_element_get_base_time (GST_ELEMENT_CAST (jitterbuffer)));
2987 if (G_LIKELY (gap == 0)) {
2988 /* packet is expected */
2989 calculate_packet_spacing (jitterbuffer, rtptime, pts);
2990 do_next_seqnum = TRUE;
2995 GST_DEBUG_OBJECT (jitterbuffer, "%d missing packets", gap);
2996 /* fill in the gap with EXPECTED timers */
2997 calculate_expected (jitterbuffer, expected, seqnum, pts, gap);
2998 do_next_seqnum = TRUE;
3000 GST_DEBUG_OBJECT (jitterbuffer, "old packet received");
3001 do_next_seqnum = FALSE;
3004 /* reset spacing estimation when gap */
3005 priv->ips_rtptime = -1;
3006 priv->ips_pts = GST_CLOCK_TIME_NONE;
3010 if (do_next_seqnum) {
3011 priv->last_in_pts = pts;
3012 priv->next_in_seqnum = (seqnum + 1) & 0xffff;
3015 timer = find_timer (jitterbuffer, seqnum);
3016 if (GST_BUFFER_IS_RETRANSMISSION (buffer)) {
3018 timer = timer_queue_find (priv->rtx_stats_timers, seqnum);
3020 timer->num_rtx_received++;
3023 /* let's check if this buffer is too late, we can only accept packets with
3024 * bigger seqnum than the one we last pushed. */
3025 if (G_LIKELY (priv->last_popped_seqnum != -1)) {
3028 gap = gst_rtp_buffer_compare_seqnum (priv->last_popped_seqnum, seqnum);
3030 /* priv->last_popped_seqnum >= seqnum, we're too late. */
3031 if (G_UNLIKELY (gap <= 0)) {
3032 if (priv->do_retransmission) {
3033 if (GST_BUFFER_IS_RETRANSMISSION (buffer) && timer) {
3034 update_rtx_stats (jitterbuffer, timer, dts, FALSE);
3035 /* Only count the retranmitted packet too late if it has been
3036 * considered lost. If the original packet arrived before the
3037 * retransmitted we just count it as a duplicate. */
3038 if (timer->type != TIMER_TYPE_LOST)
3046 if (already_lost (jitterbuffer, seqnum))
3049 /* let's drop oldest packet if the queue is already full and drop-on-latency
3050 * is set. We can only do this when there actually is a latency. When no
3051 * latency is set, we just pump it in the queue and let the other end push it
3052 * out as fast as possible. */
3053 if (priv->latency_ms && priv->drop_on_latency) {
3055 gst_util_uint64_scale_int (priv->latency_ms, priv->clock_rate, 1000);
3057 if (G_UNLIKELY (rtp_jitter_buffer_get_ts_diff (priv->jbuf) >= latency_ts)) {
3058 RTPJitterBufferItem *old_item;
3060 old_item = rtp_jitter_buffer_peek (priv->jbuf);
3062 if (IS_DROPABLE (old_item)) {
3063 old_item = rtp_jitter_buffer_pop (priv->jbuf, &percent);
3064 GST_DEBUG_OBJECT (jitterbuffer, "Queue full, dropping old packet %p",
3066 priv->next_seqnum = (old_item->seqnum + old_item->count) & 0xffff;
3067 free_item (old_item);
3069 /* we might have removed some head buffers, signal the pushing thread to
3070 * see if it can push now */
3071 JBUF_SIGNAL_EVENT (priv);
3075 /* If we estimated the DTS, don't consider it in the clock skew calculations
3076 * later. The code above always sets dts to pts or the other way around if
3077 * any of those is valid in the buffer, so we know that if we estimated the
3078 * dts that both are unknown */
3081 alloc_item (buffer, ITEM_TYPE_BUFFER, GST_CLOCK_TIME_NONE,
3082 pts, seqnum, 1, rtptime);
3084 item = alloc_item (buffer, ITEM_TYPE_BUFFER, dts, pts, seqnum, 1, rtptime);
3086 /* now insert the packet into the queue in sorted order. This function returns
3087 * FALSE if a packet with the same seqnum was already in the queue, meaning we
3088 * have a duplicate. */
3089 if (G_UNLIKELY (!rtp_jitter_buffer_insert (priv->jbuf, item, &head,
3091 if (GST_BUFFER_IS_RETRANSMISSION (buffer) && timer)
3092 update_rtx_stats (jitterbuffer, timer, dts, FALSE);
3097 update_timers (jitterbuffer, seqnum, dts, pts, do_next_seqnum,
3098 GST_BUFFER_IS_RETRANSMISSION (buffer), timer);
3100 /* we had an unhandled SR, handle it now */
3102 do_handle_sync (jitterbuffer);
3104 if (G_UNLIKELY (head)) {
3105 /* signal addition of new buffer when the _loop is waiting. */
3106 if (G_LIKELY (priv->active))
3107 JBUF_SIGNAL_EVENT (priv);
3109 /* let's unschedule and unblock any waiting buffers. We only want to do this
3110 * when the head buffer changed */
3111 if (G_UNLIKELY (priv->clock_id)) {
3112 GST_DEBUG_OBJECT (jitterbuffer, "Unscheduling waiting new buffer");
3113 unschedule_current_timer (jitterbuffer);
3117 GST_DEBUG_OBJECT (jitterbuffer,
3118 "Pushed packet #%d, now %d packets, head: %d, " "percent %d", seqnum,
3119 rtp_jitter_buffer_num_packets (priv->jbuf), head, percent);
3121 msg = check_buffering_percent (jitterbuffer, percent);
3127 gst_element_post_message (GST_ELEMENT_CAST (jitterbuffer), msg);
3134 /* this is not fatal but should be filtered earlier */
3135 GST_ELEMENT_WARNING (jitterbuffer, STREAM, DECODE, (NULL),
3136 ("Received invalid RTP payload, dropping"));
3137 gst_buffer_unref (buffer);
3142 GST_WARNING_OBJECT (jitterbuffer,
3143 "No clock-rate in caps!, dropping buffer");
3144 gst_buffer_unref (buffer);
3149 ret = priv->srcresult;
3150 GST_DEBUG_OBJECT (jitterbuffer, "flushing %s", gst_flow_get_name (ret));
3151 gst_buffer_unref (buffer);
3157 GST_WARNING_OBJECT (jitterbuffer, "we are EOS, refusing buffer");
3158 gst_buffer_unref (buffer);
3163 GST_DEBUG_OBJECT (jitterbuffer, "Packet #%d too late as #%d was already"
3164 " popped, dropping", seqnum, priv->last_popped_seqnum);
3166 gst_buffer_unref (buffer);
3171 GST_DEBUG_OBJECT (jitterbuffer, "Packet #%d too late as it was already "
3172 "considered lost", seqnum);
3174 gst_buffer_unref (buffer);
3179 GST_DEBUG_OBJECT (jitterbuffer, "Duplicate packet #%d detected, dropping",
3181 priv->num_duplicates++;
3187 GST_DEBUG_OBJECT (jitterbuffer,
3188 "Duplicate RTX packet #%d detected, dropping", seqnum);
3189 priv->num_duplicates++;
3190 gst_buffer_unref (buffer);
3196 compute_elapsed (GstRtpJitterBuffer * jitterbuffer, RTPJitterBufferItem * item)
3198 guint64 ext_time, elapsed;
3200 GstRtpJitterBufferPrivate *priv;
3202 priv = jitterbuffer->priv;
3203 rtp_time = item->rtptime;
3205 GST_LOG_OBJECT (jitterbuffer, "rtp %" G_GUINT32_FORMAT ", ext %"
3206 G_GUINT64_FORMAT, rtp_time, priv->ext_timestamp);
3208 ext_time = priv->ext_timestamp;
3209 ext_time = gst_rtp_buffer_ext_timestamp (&ext_time, rtp_time);
3210 if (ext_time < priv->ext_timestamp) {
3211 ext_time = priv->ext_timestamp;
3213 priv->ext_timestamp = ext_time;
3216 if (ext_time > priv->clock_base)
3217 elapsed = ext_time - priv->clock_base;
3221 elapsed = gst_util_uint64_scale_int (elapsed, GST_SECOND, priv->clock_rate);
3226 update_estimated_eos (GstRtpJitterBuffer * jitterbuffer,
3227 RTPJitterBufferItem * item)
3229 guint64 total, elapsed, left, estimated;
3230 GstClockTime out_time;
3231 GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
3233 if (priv->npt_stop == -1 || priv->ext_timestamp == -1
3234 || priv->clock_base == -1 || priv->clock_rate <= 0)
3237 /* compute the elapsed time */
3238 elapsed = compute_elapsed (jitterbuffer, item);
3240 /* do nothing if elapsed time doesn't increment */
3241 if (priv->last_elapsed && elapsed <= priv->last_elapsed)
3244 priv->last_elapsed = elapsed;
3246 /* this is the total time we need to play */
3247 total = priv->npt_stop - priv->npt_start;
3248 GST_LOG_OBJECT (jitterbuffer, "total %" GST_TIME_FORMAT,
3249 GST_TIME_ARGS (total));
3251 /* this is how much time there is left */
3252 if (total > elapsed)
3253 left = total - elapsed;
3257 /* if we have less time left that the size of the buffer, we will not
3258 * be able to keep it filled, disabled buffering then */
3259 if (left < rtp_jitter_buffer_get_delay (priv->jbuf)) {
3260 GST_DEBUG_OBJECT (jitterbuffer, "left %" GST_TIME_FORMAT
3261 ", disable buffering close to EOS", GST_TIME_ARGS (left));
3262 rtp_jitter_buffer_disable_buffering (priv->jbuf, TRUE);
3265 /* this is the current time as running-time */
3266 out_time = item->pts;
3269 estimated = gst_util_uint64_scale (out_time, total, elapsed);
3271 /* if there is almost nothing left,
3272 * we may never advance enough to end up in the above case */
3273 if (total < GST_SECOND)
3274 estimated = GST_SECOND;
3278 GST_LOG_OBJECT (jitterbuffer, "elapsed %" GST_TIME_FORMAT ", estimated %"
3279 GST_TIME_FORMAT, GST_TIME_ARGS (elapsed), GST_TIME_ARGS (estimated));
3281 if (estimated != -1 && priv->estimated_eos != estimated) {
3282 set_timer (jitterbuffer, TIMER_TYPE_EOS, -1, estimated);
3283 priv->estimated_eos = estimated;
3287 /* take a buffer from the queue and push it */
3288 static GstFlowReturn
3289 pop_and_push_next (GstRtpJitterBuffer * jitterbuffer, guint seqnum)
3291 GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
3292 GstFlowReturn result = GST_FLOW_OK;
3293 RTPJitterBufferItem *item;
3294 GstBuffer *outbuf = NULL;
3295 GstEvent *outevent = NULL;
3296 GstQuery *outquery = NULL;
3297 GstClockTime dts, pts;
3299 gboolean do_push = TRUE;
3303 /* when we get here we are ready to pop and push the buffer */
3304 item = rtp_jitter_buffer_pop (priv->jbuf, &percent);
3308 case ITEM_TYPE_BUFFER:
3310 /* we need to make writable to change the flags and timestamps */
3311 outbuf = gst_buffer_make_writable (item->data);
3313 if (G_UNLIKELY (priv->discont)) {
3314 /* set DISCONT flag when we missed a packet. We pushed the buffer writable
3315 * into the jitterbuffer so we can modify now. */
3316 GST_DEBUG_OBJECT (jitterbuffer, "mark output buffer discont");
3317 GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DISCONT);
3318 priv->discont = FALSE;
3320 if (G_UNLIKELY (priv->ts_discont)) {
3321 GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_RESYNC);
3322 priv->ts_discont = FALSE;
3326 gst_segment_position_from_running_time (&priv->segment,
3327 GST_FORMAT_TIME, item->dts);
3329 gst_segment_position_from_running_time (&priv->segment,
3330 GST_FORMAT_TIME, item->pts);
3332 /* apply timestamp with offset to buffer now */
3333 GST_BUFFER_DTS (outbuf) = apply_offset (jitterbuffer, dts);
3334 GST_BUFFER_PTS (outbuf) = apply_offset (jitterbuffer, pts);
3336 /* update the elapsed time when we need to check against the npt stop time. */
3337 update_estimated_eos (jitterbuffer, item);
3339 priv->last_out_time = GST_BUFFER_PTS (outbuf);
3341 case ITEM_TYPE_LOST:
3342 priv->discont = TRUE;
3346 case ITEM_TYPE_EVENT:
3347 outevent = item->data;
3349 case ITEM_TYPE_QUERY:
3350 outquery = item->data;
3354 /* now we are ready to push the buffer. Save the seqnum and release the lock
3355 * so the other end can push stuff in the queue again. */
3357 priv->last_popped_seqnum = seqnum;
3358 priv->next_seqnum = (seqnum + item->count) & 0xffff;
3360 msg = check_buffering_percent (jitterbuffer, percent);
3367 gst_element_post_message (GST_ELEMENT_CAST (jitterbuffer), msg);
3370 case ITEM_TYPE_BUFFER:
3372 GST_DEBUG_OBJECT (jitterbuffer,
3373 "Pushing buffer %d, dts %" GST_TIME_FORMAT ", pts %" GST_TIME_FORMAT,
3374 seqnum, GST_TIME_ARGS (GST_BUFFER_DTS (outbuf)),
3375 GST_TIME_ARGS (GST_BUFFER_PTS (outbuf)));
3377 result = gst_pad_push (priv->srcpad, outbuf);
3379 JBUF_LOCK_CHECK (priv, out_flushing);
3381 case ITEM_TYPE_LOST:
3382 case ITEM_TYPE_EVENT:
3383 /* We got not enough consecutive packets with a huge gap, we can
3384 * as well just drop them here now on EOS */
3385 if (outevent && GST_EVENT_TYPE (outevent) == GST_EVENT_EOS) {
3386 GST_DEBUG_OBJECT (jitterbuffer, "Clearing gap packets on EOS");
3387 g_queue_foreach (&priv->gap_packets, (GFunc) gst_buffer_unref, NULL);
3388 g_queue_clear (&priv->gap_packets);
3391 GST_DEBUG_OBJECT (jitterbuffer, "%sPushing event %" GST_PTR_FORMAT
3392 ", seqnum %d", do_push ? "" : "NOT ", outevent, seqnum);
3395 gst_pad_push_event (priv->srcpad, outevent);
3397 gst_event_unref (outevent);
3399 result = GST_FLOW_OK;
3401 JBUF_LOCK_CHECK (priv, out_flushing);
3403 case ITEM_TYPE_QUERY:
3407 res = gst_pad_peer_query (priv->srcpad, outquery);
3409 JBUF_LOCK_CHECK (priv, out_flushing);
3410 result = GST_FLOW_OK;
3411 GST_LOG_OBJECT (jitterbuffer, "did query %p, return %d", outquery, res);
3412 JBUF_SIGNAL_QUERY (priv, res);
3421 return priv->srcresult;
3425 #define GST_FLOW_WAIT GST_FLOW_CUSTOM_SUCCESS
3427 /* Peek a buffer and compare the seqnum to the expected seqnum.
3428 * If all is fine, the buffer is pushed.
3429 * If something is wrong, we wait for some event
3431 static GstFlowReturn
3432 handle_next_buffer (GstRtpJitterBuffer * jitterbuffer)
3434 GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
3435 GstFlowReturn result;
3436 RTPJitterBufferItem *item;
3438 guint32 next_seqnum;
3440 /* only push buffers when PLAYING and active and not buffering */
3441 if (priv->blocked || !priv->active ||
3442 rtp_jitter_buffer_is_buffering (priv->jbuf)) {
3443 return GST_FLOW_WAIT;
3446 /* peek a buffer, we're just looking at the sequence number.
3447 * If all is fine, we'll pop and push it. If the sequence number is wrong we
3448 * wait for a timeout or something to change.
3449 * The peeked buffer is valid for as long as we hold the jitterbuffer lock. */
3450 item = rtp_jitter_buffer_peek (priv->jbuf);
3455 /* get the seqnum and the next expected seqnum */
3456 seqnum = item->seqnum;
3458 return pop_and_push_next (jitterbuffer, seqnum);
3461 next_seqnum = priv->next_seqnum;
3463 /* get the gap between this and the previous packet. If we don't know the
3464 * previous packet seqnum assume no gap. */
3465 if (G_UNLIKELY (next_seqnum == -1)) {
3466 GST_DEBUG_OBJECT (jitterbuffer, "First buffer #%d", seqnum);
3467 /* we don't know what the next_seqnum should be, the chain function should
3468 * have scheduled a DEADLINE timer that will increment next_seqnum when it
3469 * fires, so wait for that */
3470 result = GST_FLOW_WAIT;
3472 gint gap = gst_rtp_buffer_compare_seqnum (next_seqnum, seqnum);
3474 if (G_LIKELY (gap == 0)) {
3475 /* no missing packet, pop and push */
3476 result = pop_and_push_next (jitterbuffer, seqnum);
3477 } else if (G_UNLIKELY (gap < 0)) {
3478 /* if we have a packet that we already pushed or considered dropped, pop it
3479 * off and get the next packet */
3480 GST_DEBUG_OBJECT (jitterbuffer, "Old packet #%d, next #%d dropping",
3481 seqnum, next_seqnum);
3482 item = rtp_jitter_buffer_pop (priv->jbuf, NULL);
3484 result = GST_FLOW_OK;
3486 /* the chain function has scheduled timers to request retransmission or
3487 * when to consider the packet lost, wait for that */
3488 GST_DEBUG_OBJECT (jitterbuffer,
3489 "Sequence number GAP detected: expected %d instead of %d (%d missing)",
3490 next_seqnum, seqnum, gap);
3491 result = GST_FLOW_WAIT;
3499 GST_DEBUG_OBJECT (jitterbuffer, "no buffer, going to wait");
3501 return GST_FLOW_EOS;
3503 return GST_FLOW_WAIT;
3509 get_rtx_retry_timeout (GstRtpJitterBufferPrivate * priv)
3511 GstClockTime rtx_retry_timeout;
3512 GstClockTime rtx_min_retry_timeout;
3514 if (priv->rtx_retry_timeout == -1) {
3515 if (priv->avg_rtx_rtt == 0)
3516 rtx_retry_timeout = DEFAULT_AUTO_RTX_TIMEOUT;
3518 /* we want to ask for a retransmission after we waited for a
3519 * complete RTT and the additional jitter */
3520 rtx_retry_timeout = priv->avg_rtx_rtt + priv->avg_jitter * 2;
3522 rtx_retry_timeout = priv->rtx_retry_timeout * GST_MSECOND;
3524 /* make sure we don't retry too often. On very low latency networks,
3525 * the RTT and jitter can be very low. */
3526 if (priv->rtx_min_retry_timeout == -1) {
3527 rtx_min_retry_timeout = priv->packet_spacing;
3529 rtx_min_retry_timeout = priv->rtx_min_retry_timeout * GST_MSECOND;
3531 rtx_retry_timeout = MAX (rtx_retry_timeout, rtx_min_retry_timeout);
3533 return rtx_retry_timeout;
3537 get_rtx_retry_period (GstRtpJitterBufferPrivate * priv,
3538 GstClockTime rtx_retry_timeout)
3540 GstClockTime rtx_retry_period;
3542 if (priv->rtx_retry_period == -1) {
3543 /* we retry up to the configured jitterbuffer size but leaving some
3544 * room for the retransmission to arrive in time */
3545 if (rtx_retry_timeout > priv->latency_ns) {
3546 rtx_retry_period = 0;
3548 rtx_retry_period = priv->latency_ns - rtx_retry_timeout;
3551 rtx_retry_period = priv->rtx_retry_period * GST_MSECOND;
3553 return rtx_retry_period;
3557 1. For *larger* rtx-rtt, weigh a new measurement as before (1/8th)
3558 2. For *smaller* rtx-rtt, be a bit more conservative and weigh a bit less (1/16th)
3559 3. For very large measurements (> avg * 2), consider them "outliers"
3560 and count them a lot less (1/48th)
3563 update_avg_rtx_rtt (GstRtpJitterBufferPrivate * priv, GstClockTime rtt)
3567 if (priv->avg_rtx_rtt == 0) {
3568 priv->avg_rtx_rtt = rtt;
3572 if (rtt > 2 * priv->avg_rtx_rtt)
3574 else if (rtt > priv->avg_rtx_rtt)
3579 priv->avg_rtx_rtt = (rtt + (weight - 1) * priv->avg_rtx_rtt) / weight;
3583 update_rtx_stats (GstRtpJitterBuffer * jitterbuffer, TimerData * timer,
3584 GstClockTime dts, gboolean success)
3586 GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
3590 /* we scheduled a retry for this packet and now we have it */
3591 priv->num_rtx_success++;
3592 /* all the previous retry attempts failed */
3593 priv->num_rtx_failed += timer->num_rtx_retry - 1;
3595 /* All retries failed or was too late */
3596 priv->num_rtx_failed += timer->num_rtx_retry;
3599 /* number of retries before (hopefully) receiving the packet */
3600 if (priv->avg_rtx_num == 0.0)
3601 priv->avg_rtx_num = timer->num_rtx_retry;
3603 priv->avg_rtx_num = (timer->num_rtx_retry + 7 * priv->avg_rtx_num) / 8;
3605 /* Calculate the delay between retransmission request and receiving this
3606 * packet. We have a valid delay if and only if this packet is a response to
3607 * our last request. If not we don't know if this is a response to an
3608 * earlier request and delay could be way off. For RTT is more important
3609 * with correct values than to update for every packet. */
3610 if (timer->num_rtx_retry == timer->num_rtx_received &&
3611 dts != GST_CLOCK_TIME_NONE && dts > timer->rtx_last) {
3612 delay = dts - timer->rtx_last;
3613 update_avg_rtx_rtt (priv, delay);
3618 GST_LOG_OBJECT (jitterbuffer,
3619 "RTX #%d, result %d, success %" G_GUINT64_FORMAT ", failed %"
3620 G_GUINT64_FORMAT ", requests %" G_GUINT64_FORMAT ", dups %"
3621 G_GUINT64_FORMAT ", avg-num %g, delay %" GST_TIME_FORMAT ", avg-rtt %"
3622 GST_TIME_FORMAT, timer->seqnum, success, priv->num_rtx_success,
3623 priv->num_rtx_failed, priv->num_rtx_requests, priv->num_duplicates,
3624 priv->avg_rtx_num, GST_TIME_ARGS (delay),
3625 GST_TIME_ARGS (priv->avg_rtx_rtt));
3628 /* the timeout for when we expected a packet expired */
3630 do_expected_timeout (GstRtpJitterBuffer * jitterbuffer, TimerData * timer,
3633 GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
3635 guint delay, delay_ms, avg_rtx_rtt_ms;
3636 guint rtx_retry_timeout_ms, rtx_retry_period_ms;
3637 guint rtx_deadline_ms;
3638 GstClockTime rtx_retry_period;
3639 GstClockTime rtx_retry_timeout;
3642 GST_DEBUG_OBJECT (jitterbuffer, "expected %d didn't arrive, now %"
3643 GST_TIME_FORMAT, timer->seqnum, GST_TIME_ARGS (now));
3645 rtx_retry_timeout = get_rtx_retry_timeout (priv);
3646 rtx_retry_period = get_rtx_retry_period (priv, rtx_retry_timeout);
3648 delay = timer->rtx_delay + timer->rtx_retry;
3650 delay_ms = GST_TIME_AS_MSECONDS (delay);
3651 rtx_retry_timeout_ms = GST_TIME_AS_MSECONDS (rtx_retry_timeout);
3652 rtx_retry_period_ms = GST_TIME_AS_MSECONDS (rtx_retry_period);
3653 avg_rtx_rtt_ms = GST_TIME_AS_MSECONDS (priv->avg_rtx_rtt);
3655 priv->rtx_deadline_ms != -1 ? priv->rtx_deadline_ms : priv->latency_ms;
3657 event = gst_event_new_custom (GST_EVENT_CUSTOM_UPSTREAM,
3658 gst_structure_new ("GstRTPRetransmissionRequest",
3659 "seqnum", G_TYPE_UINT, (guint) timer->seqnum,
3660 "running-time", G_TYPE_UINT64, timer->rtx_base,
3661 "delay", G_TYPE_UINT, delay_ms,
3662 "retry", G_TYPE_UINT, timer->num_rtx_retry,
3663 "frequency", G_TYPE_UINT, rtx_retry_timeout_ms,
3664 "period", G_TYPE_UINT, rtx_retry_period_ms,
3665 "deadline", G_TYPE_UINT, rtx_deadline_ms,
3666 "packet-spacing", G_TYPE_UINT64, priv->packet_spacing,
3667 "avg-rtt", G_TYPE_UINT, avg_rtx_rtt_ms, NULL));
3668 GST_DEBUG_OBJECT (jitterbuffer, "Request RTX: %" GST_PTR_FORMAT, event);
3670 priv->num_rtx_requests++;
3671 timer->num_rtx_retry++;
3673 GST_OBJECT_LOCK (jitterbuffer);
3674 if ((clock = GST_ELEMENT_CLOCK (jitterbuffer))) {
3675 timer->rtx_last = gst_clock_get_time (clock);
3676 timer->rtx_last -= GST_ELEMENT_CAST (jitterbuffer)->base_time;
3678 timer->rtx_last = now;
3680 GST_OBJECT_UNLOCK (jitterbuffer);
3682 /* calculate the timeout for the next retransmission attempt */
3683 timer->rtx_retry += rtx_retry_timeout;
3684 GST_DEBUG_OBJECT (jitterbuffer, "base %" GST_TIME_FORMAT ", delay %"
3685 GST_TIME_FORMAT ", retry %" GST_TIME_FORMAT ", num_retry %u",
3686 GST_TIME_ARGS (timer->rtx_base), GST_TIME_ARGS (timer->rtx_delay),
3687 GST_TIME_ARGS (timer->rtx_retry), timer->num_rtx_retry);
3688 if ((priv->rtx_max_retries != -1
3689 && timer->num_rtx_retry >= priv->rtx_max_retries)
3690 || (timer->rtx_retry + timer->rtx_delay > rtx_retry_period)
3691 || (timer->rtx_base + rtx_retry_period < now)) {
3692 GST_DEBUG_OBJECT (jitterbuffer, "reschedule as LOST timer");
3693 /* too many retransmission request, we now convert the timer
3694 * to a lost timer, leave the num_rtx_retry as it is for stats */
3695 timer->type = TIMER_TYPE_LOST;
3696 timer->rtx_delay = 0;
3697 timer->rtx_retry = 0;
3699 reschedule_timer (jitterbuffer, timer, timer->seqnum,
3700 timer->rtx_base + timer->rtx_retry, timer->rtx_delay, FALSE);
3703 gst_pad_push_event (priv->sinkpad, event);
3709 /* a packet is lost */
3711 do_lost_timeout (GstRtpJitterBuffer * jitterbuffer, TimerData * timer,
3714 GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
3715 guint seqnum, lost_packets, num_rtx_retry, next_in_seqnum;
3717 GstEvent *event = NULL;
3718 RTPJitterBufferItem *item;
3720 seqnum = timer->seqnum;
3721 lost_packets = MAX (timer->num, 1);
3722 num_rtx_retry = timer->num_rtx_retry;
3724 /* we had a gap and thus we lost some packets. Create an event for this. */
3725 if (lost_packets > 1)
3726 GST_DEBUG_OBJECT (jitterbuffer, "Packets #%d -> #%d lost", seqnum,
3727 seqnum + lost_packets - 1);
3729 GST_DEBUG_OBJECT (jitterbuffer, "Packet #%d lost", seqnum);
3731 priv->num_lost += lost_packets;
3732 priv->num_rtx_failed += num_rtx_retry;
3734 next_in_seqnum = (seqnum + lost_packets) & 0xffff;
3736 /* we now only accept seqnum bigger than this */
3737 if (gst_rtp_buffer_compare_seqnum (priv->next_in_seqnum, next_in_seqnum) > 0) {
3738 priv->next_in_seqnum = next_in_seqnum;
3739 priv->last_in_pts = apply_offset (jitterbuffer, timer->timeout);
3742 /* Avoid creating events if we don't need it. Note that we still need to create
3743 * the lost *ITEM* since it will be used to notify the outgoing thread of
3744 * lost items (so that we can set discont flags and such) */
3745 if (priv->do_lost) {
3746 GstClockTime duration, timestamp;
3747 /* create paket lost event */
3748 timestamp = apply_offset (jitterbuffer, timer->timeout);
3749 duration = timer->duration;
3750 if (duration == GST_CLOCK_TIME_NONE && priv->packet_spacing > 0)
3751 duration = priv->packet_spacing;
3752 event = gst_event_new_custom (GST_EVENT_CUSTOM_DOWNSTREAM,
3753 gst_structure_new ("GstRTPPacketLost",
3754 "seqnum", G_TYPE_UINT, (guint) seqnum,
3755 "timestamp", G_TYPE_UINT64, timestamp,
3756 "duration", G_TYPE_UINT64, duration,
3757 "retry", G_TYPE_UINT, num_rtx_retry, NULL));
3759 item = alloc_item (event, ITEM_TYPE_LOST, -1, -1, seqnum, lost_packets, -1);
3760 rtp_jitter_buffer_insert (priv->jbuf, item, &head, NULL);
3762 if (GST_CLOCK_TIME_IS_VALID (timer->rtx_last)) {
3763 /* Store info to update stats if the packet arrives too late */
3764 timer_queue_append (priv->rtx_stats_timers, timer,
3765 now + priv->rtx_stats_timeout * GST_MSECOND, TRUE);
3767 remove_timer (jitterbuffer, timer);
3770 JBUF_SIGNAL_EVENT (priv);
3776 do_eos_timeout (GstRtpJitterBuffer * jitterbuffer, TimerData * timer,
3779 GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
3781 GST_INFO_OBJECT (jitterbuffer, "got the NPT timeout");
3782 remove_timer (jitterbuffer, timer);
3784 /* there was no EOS in the buffer, put one in there now */
3785 queue_event (jitterbuffer, gst_event_new_eos ());
3787 JBUF_SIGNAL_EVENT (priv);
3793 do_deadline_timeout (GstRtpJitterBuffer * jitterbuffer, TimerData * timer,
3796 GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
3798 GST_INFO_OBJECT (jitterbuffer, "got deadline timeout");
3800 /* timer seqnum might have been obsoleted by caps seqnum-base,
3801 * only mess with current ongoing seqnum if still unknown */
3802 if (priv->next_seqnum == -1)
3803 priv->next_seqnum = timer->seqnum;
3804 remove_timer (jitterbuffer, timer);
3805 JBUF_SIGNAL_EVENT (priv);
3811 do_timeout (GstRtpJitterBuffer * jitterbuffer, TimerData * timer,
3814 gboolean removed = FALSE;
3816 switch (timer->type) {
3817 case TIMER_TYPE_EXPECTED:
3818 removed = do_expected_timeout (jitterbuffer, timer, now);
3820 case TIMER_TYPE_LOST:
3821 removed = do_lost_timeout (jitterbuffer, timer, now);
3823 case TIMER_TYPE_DEADLINE:
3824 removed = do_deadline_timeout (jitterbuffer, timer, now);
3826 case TIMER_TYPE_EOS:
3827 removed = do_eos_timeout (jitterbuffer, timer, now);
3833 /* called when we need to wait for the next timeout.
3835 * We loop over the array of recorded timeouts and wait for the earliest one.
3836 * When it timed out, do the logic associated with the timer.
3838 * If there are no timers, we wait on a gcond until something new happens.
3841 wait_next_timeout (GstRtpJitterBuffer * jitterbuffer)
3843 GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
3844 GstClockTime now = 0;
3847 while (priv->timer_running) {
3848 TimerData *timer = NULL;
3849 GstClockTime timer_timeout = -1;
3852 /* If we have a clock, update "now" now with the very
3853 * latest running time we have. If timers are unscheduled below we
3854 * otherwise wouldn't update now (it's only updated when timers
3855 * expire), and also for the very first loop iteration now would
3856 * otherwise always be 0
3858 GST_OBJECT_LOCK (jitterbuffer);
3859 if (GST_ELEMENT_CLOCK (jitterbuffer)) {
3861 gst_clock_get_time (GST_ELEMENT_CLOCK (jitterbuffer)) -
3862 GST_ELEMENT_CAST (jitterbuffer)->base_time;
3864 GST_OBJECT_UNLOCK (jitterbuffer);
3866 GST_DEBUG_OBJECT (jitterbuffer, "now %" GST_TIME_FORMAT,
3867 GST_TIME_ARGS (now));
3869 /* Clear expired rtx-stats timers */
3870 if (priv->do_retransmission)
3871 timer_queue_clear_until (priv->rtx_stats_timers, now);
3873 /* Iterate "normal" timers */
3874 len = priv->timers->len;
3875 for (i = 0; i < len;) {
3876 TimerData *test = &g_array_index (priv->timers, TimerData, i);
3877 GstClockTime test_timeout = get_timeout (jitterbuffer, test);
3878 gboolean save_best = FALSE;
3880 GST_DEBUG_OBJECT (jitterbuffer,
3881 "%d, %d, %d, %" GST_TIME_FORMAT " diff:%" GST_STIME_FORMAT, i,
3882 test->type, test->seqnum, GST_TIME_ARGS (test_timeout),
3883 GST_STIME_ARGS ((gint64) (test_timeout - now)));
3885 /* Weed out anything too late */
3886 if (test->type == TIMER_TYPE_LOST &&
3887 (test_timeout == -1 || test_timeout <= now)) {
3888 GST_DEBUG_OBJECT (jitterbuffer, "Weeding out late entry");
3889 do_lost_timeout (jitterbuffer, test, now);
3890 if (!priv->timer_running)
3892 /* We don't move the iterator forward since we just removed the current entry,
3893 * but we update the termination condition */
3894 len = priv->timers->len;
3896 /* find the smallest timeout */
3897 if (timer == NULL) {
3899 } else if (timer_timeout == -1) {
3900 /* we already have an immediate timeout, the new timer must be an
3901 * immediate timer with smaller seqnum to become the best */
3902 if (test_timeout == -1
3903 && (gst_rtp_buffer_compare_seqnum (test->seqnum,
3904 timer->seqnum) > 0))
3906 } else if (test_timeout == -1) {
3907 /* first immediate timer */
3909 } else if (test_timeout < timer_timeout) {
3912 } else if (test_timeout == timer_timeout
3913 && (gst_rtp_buffer_compare_seqnum (test->seqnum,
3914 timer->seqnum) > 0)) {
3915 /* same timer, smaller seqnum */
3920 GST_DEBUG_OBJECT (jitterbuffer, "new best %d", i);
3922 timer_timeout = test_timeout;
3927 if (timer && !priv->blocked) {
3929 GstClockTime sync_time;
3932 GstClockTimeDiff clock_jitter;
3934 if (timer_timeout == -1 || timer_timeout <= now) {
3935 /* We have normally removed all lost timers in the loop above */
3936 g_assert (timer->type != TIMER_TYPE_LOST);
3938 do_timeout (jitterbuffer, timer, now);
3939 /* check here, do_timeout could have released the lock */
3940 if (!priv->timer_running)
3945 GST_OBJECT_LOCK (jitterbuffer);
3946 clock = GST_ELEMENT_CLOCK (jitterbuffer);
3948 GST_OBJECT_UNLOCK (jitterbuffer);
3949 /* let's just push if there is no clock */
3950 GST_DEBUG_OBJECT (jitterbuffer, "No clock, timeout right away");
3951 now = timer_timeout;
3955 /* prepare for sync against clock */
3956 sync_time = timer_timeout + GST_ELEMENT_CAST (jitterbuffer)->base_time;
3957 /* add latency of peer to get input time */
3958 sync_time += priv->peer_latency;
3960 GST_DEBUG_OBJECT (jitterbuffer, "sync to timestamp %" GST_TIME_FORMAT
3961 " with sync time %" GST_TIME_FORMAT,
3962 GST_TIME_ARGS (timer_timeout), GST_TIME_ARGS (sync_time));
3964 /* create an entry for the clock */
3965 id = priv->clock_id = gst_clock_new_single_shot_id (clock, sync_time);
3966 priv->timer_timeout = timer_timeout;
3967 priv->timer_seqnum = timer->seqnum;
3968 GST_OBJECT_UNLOCK (jitterbuffer);
3970 /* release the lock so that the other end can push stuff or unlock */
3973 ret = gst_clock_id_wait (id, &clock_jitter);
3976 if (!priv->timer_running) {
3977 gst_clock_id_unref (id);
3978 priv->clock_id = NULL;
3982 if (ret != GST_CLOCK_UNSCHEDULED) {
3983 now = timer_timeout + MAX (clock_jitter, 0);
3984 GST_DEBUG_OBJECT (jitterbuffer,
3985 "sync done, %d, #%d, %" GST_STIME_FORMAT, ret, priv->timer_seqnum,
3986 GST_STIME_ARGS (clock_jitter));
3988 GST_DEBUG_OBJECT (jitterbuffer, "sync unscheduled");
3990 /* and free the entry */
3991 gst_clock_id_unref (id);
3992 priv->clock_id = NULL;
3994 /* no timers, wait for activity */
3995 JBUF_WAIT_TIMER (priv);
4000 GST_DEBUG_OBJECT (jitterbuffer, "we are stopping");
4005 * This funcion implements the main pushing loop on the source pad.
4007 * It first tries to push as many buffers as possible. If there is a seqnum
4008 * mismatch, we wait for the next timeouts.
4011 gst_rtp_jitter_buffer_loop (GstRtpJitterBuffer * jitterbuffer)
4013 GstRtpJitterBufferPrivate *priv;
4014 GstFlowReturn result = GST_FLOW_OK;
4016 priv = jitterbuffer->priv;
4018 JBUF_LOCK_CHECK (priv, flushing);
4020 result = handle_next_buffer (jitterbuffer);
4021 if (G_LIKELY (result == GST_FLOW_WAIT)) {
4022 /* now wait for the next event */
4023 JBUF_WAIT_EVENT (priv, flushing);
4024 result = GST_FLOW_OK;
4026 } while (result == GST_FLOW_OK);
4027 /* store result for upstream */
4028 priv->srcresult = result;
4029 /* if we get here we need to pause */
4035 result = priv->srcresult;
4042 JBUF_SIGNAL_QUERY (priv, FALSE);
4045 GST_DEBUG_OBJECT (jitterbuffer, "pausing task, reason %s",
4046 gst_flow_get_name (result));
4047 gst_pad_pause_task (priv->srcpad);
4048 if (result == GST_FLOW_EOS) {
4049 event = gst_event_new_eos ();
4050 gst_pad_push_event (priv->srcpad, event);
4056 /* collect the info from the lastest RTCP packet and the jitterbuffer sync, do
4057 * some sanity checks and then emit the handle-sync signal with the parameters.
4058 * This function must be called with the LOCK */
4060 do_handle_sync (GstRtpJitterBuffer * jitterbuffer)
4062 GstRtpJitterBufferPrivate *priv;
4063 guint64 base_rtptime, base_time;
4065 guint64 last_rtptime;
4067 guint64 ext_rtptime, diff;
4068 gboolean valid = TRUE, keep = FALSE;
4070 priv = jitterbuffer->priv;
4072 /* get the last values from the jitterbuffer */
4073 rtp_jitter_buffer_get_sync (priv->jbuf, &base_rtptime, &base_time,
4074 &clock_rate, &last_rtptime);
4076 clock_base = priv->clock_base;
4077 ext_rtptime = priv->ext_rtptime;
4079 GST_DEBUG_OBJECT (jitterbuffer, "ext SR %" G_GUINT64_FORMAT ", base %"
4080 G_GUINT64_FORMAT ", clock-rate %" G_GUINT32_FORMAT
4081 ", clock-base %" G_GUINT64_FORMAT ", last-rtptime %" G_GUINT64_FORMAT,
4082 ext_rtptime, base_rtptime, clock_rate, clock_base, last_rtptime);
4084 if (base_rtptime == -1 || clock_rate == -1 || base_time == -1) {
4085 /* we keep this SR packet for later. When we get a valid RTP packet the
4086 * above values will be set and we can try to use the SR packet */
4087 GST_DEBUG_OBJECT (jitterbuffer, "keeping for later, no RTP values");
4090 /* we can't accept anything that happened before we did the last resync */
4091 if (base_rtptime > ext_rtptime) {
4092 GST_DEBUG_OBJECT (jitterbuffer, "dropping, older than base time");
4095 /* the SR RTP timestamp must be something close to what we last observed
4096 * in the jitterbuffer */
4097 if (ext_rtptime > last_rtptime) {
4098 /* check how far ahead it is to our RTP timestamps */
4099 diff = ext_rtptime - last_rtptime;
4100 /* if bigger than 1 second, we drop it */
4101 if (jitterbuffer->priv->max_rtcp_rtp_time_diff != -1 &&
4103 gst_util_uint64_scale (jitterbuffer->priv->max_rtcp_rtp_time_diff,
4104 clock_rate, 1000)) {
4105 GST_DEBUG_OBJECT (jitterbuffer, "too far ahead");
4106 /* should drop this, but some RTSP servers end up with bogus
4107 * way too ahead RTCP packet when repeated PAUSE/PLAY,
4108 * so still trigger rptbin sync but invalidate RTCP data
4109 * (sync might use other methods) */
4112 GST_DEBUG_OBJECT (jitterbuffer, "ext last %" G_GUINT64_FORMAT ", diff %"
4113 G_GUINT64_FORMAT, last_rtptime, diff);
4119 GST_DEBUG_OBJECT (jitterbuffer, "keeping RTCP packet for later");
4123 s = gst_structure_new ("application/x-rtp-sync",
4124 "base-rtptime", G_TYPE_UINT64, base_rtptime,
4125 "base-time", G_TYPE_UINT64, base_time,
4126 "clock-rate", G_TYPE_UINT, clock_rate,
4127 "clock-base", G_TYPE_UINT64, clock_base,
4128 "sr-ext-rtptime", G_TYPE_UINT64, ext_rtptime,
4129 "sr-buffer", GST_TYPE_BUFFER, priv->last_sr, NULL);
4131 GST_DEBUG_OBJECT (jitterbuffer, "signaling sync");
4132 gst_buffer_replace (&priv->last_sr, NULL);
4134 g_signal_emit (jitterbuffer,
4135 gst_rtp_jitter_buffer_signals[SIGNAL_HANDLE_SYNC], 0, s);
4137 gst_structure_free (s);
4139 GST_DEBUG_OBJECT (jitterbuffer, "dropping RTCP packet");
4140 gst_buffer_replace (&priv->last_sr, NULL);
4144 static GstFlowReturn
4145 gst_rtp_jitter_buffer_chain_rtcp (GstPad * pad, GstObject * parent,
4148 GstRtpJitterBuffer *jitterbuffer;
4149 GstRtpJitterBufferPrivate *priv;
4150 GstFlowReturn ret = GST_FLOW_OK;
4152 GstRTCPPacket packet;
4153 guint64 ext_rtptime;
4155 GstRTCPBuffer rtcp = { NULL, };
4157 jitterbuffer = GST_RTP_JITTER_BUFFER (parent);
4159 if (G_UNLIKELY (!gst_rtcp_buffer_validate_reduced (buffer)))
4160 goto invalid_buffer;
4162 priv = jitterbuffer->priv;
4164 gst_rtcp_buffer_map (buffer, GST_MAP_READ, &rtcp);
4166 if (!gst_rtcp_buffer_get_first_packet (&rtcp, &packet))
4169 /* first packet must be SR or RR or else the validate would have failed */
4170 switch (gst_rtcp_packet_get_type (&packet)) {
4171 case GST_RTCP_TYPE_SR:
4172 gst_rtcp_packet_sr_get_sender_info (&packet, &ssrc, NULL, &rtptime,
4178 gst_rtcp_buffer_unmap (&rtcp);
4180 GST_DEBUG_OBJECT (jitterbuffer, "received RTCP of SSRC %08x", ssrc);
4183 /* convert the RTP timestamp to our extended timestamp, using the same offset
4184 * we used in the jitterbuffer */
4185 ext_rtptime = priv->jbuf->ext_rtptime;
4186 ext_rtptime = gst_rtp_buffer_ext_timestamp (&ext_rtptime, rtptime);
4188 priv->ext_rtptime = ext_rtptime;
4189 gst_buffer_replace (&priv->last_sr, buffer);
4191 do_handle_sync (jitterbuffer);
4195 gst_buffer_unref (buffer);
4201 /* this is not fatal but should be filtered earlier */
4202 GST_ELEMENT_WARNING (jitterbuffer, STREAM, DECODE, (NULL),
4203 ("Received invalid RTCP payload, dropping"));
4209 /* this is not fatal but should be filtered earlier */
4210 GST_ELEMENT_WARNING (jitterbuffer, STREAM, DECODE, (NULL),
4211 ("Received empty RTCP payload, dropping"));
4212 gst_rtcp_buffer_unmap (&rtcp);
4218 GST_DEBUG_OBJECT (jitterbuffer, "ignoring RTCP packet");
4219 gst_rtcp_buffer_unmap (&rtcp);
4226 gst_rtp_jitter_buffer_sink_query (GstPad * pad, GstObject * parent,
4229 gboolean res = FALSE;
4230 GstRtpJitterBuffer *jitterbuffer;
4231 GstRtpJitterBufferPrivate *priv;
4233 jitterbuffer = GST_RTP_JITTER_BUFFER (parent);
4234 priv = jitterbuffer->priv;
4236 switch (GST_QUERY_TYPE (query)) {
4237 case GST_QUERY_CAPS:
4239 GstCaps *filter, *caps;
4241 gst_query_parse_caps (query, &filter);
4242 caps = gst_rtp_jitter_buffer_getcaps (pad, filter);
4243 gst_query_set_caps_result (query, caps);
4244 gst_caps_unref (caps);
4249 if (GST_QUERY_IS_SERIALIZED (query)) {
4250 RTPJitterBufferItem *item;
4253 JBUF_LOCK_CHECK (priv, out_flushing);
4254 if (rtp_jitter_buffer_get_mode (priv->jbuf) !=
4255 RTP_JITTER_BUFFER_MODE_BUFFER) {
4256 GST_DEBUG_OBJECT (jitterbuffer, "adding serialized query");
4257 item = alloc_item (query, ITEM_TYPE_QUERY, -1, -1, -1, 0, -1);
4258 rtp_jitter_buffer_insert (priv->jbuf, item, &head, NULL);
4260 JBUF_SIGNAL_EVENT (priv);
4261 JBUF_WAIT_QUERY (priv, out_flushing);
4262 res = priv->last_query;
4264 GST_DEBUG_OBJECT (jitterbuffer, "refusing query, we are buffering");
4269 res = gst_pad_query_default (pad, parent, query);
4277 GST_DEBUG_OBJECT (jitterbuffer, "we are flushing");
4285 gst_rtp_jitter_buffer_src_query (GstPad * pad, GstObject * parent,
4288 GstRtpJitterBuffer *jitterbuffer;
4289 GstRtpJitterBufferPrivate *priv;
4290 gboolean res = FALSE;
4292 jitterbuffer = GST_RTP_JITTER_BUFFER (parent);
4293 priv = jitterbuffer->priv;
4295 switch (GST_QUERY_TYPE (query)) {
4296 case GST_QUERY_LATENCY:
4298 /* We need to send the query upstream and add the returned latency to our
4300 GstClockTime min_latency, max_latency;
4302 GstClockTime our_latency;
4304 if ((res = gst_pad_peer_query (priv->sinkpad, query))) {
4305 gst_query_parse_latency (query, &us_live, &min_latency, &max_latency);
4307 GST_DEBUG_OBJECT (jitterbuffer, "Peer latency: min %"
4308 GST_TIME_FORMAT " max %" GST_TIME_FORMAT,
4309 GST_TIME_ARGS (min_latency), GST_TIME_ARGS (max_latency));
4311 /* store this so that we can safely sync on the peer buffers. */
4313 priv->peer_latency = min_latency;
4314 our_latency = priv->latency_ns;
4317 GST_DEBUG_OBJECT (jitterbuffer, "Our latency: %" GST_TIME_FORMAT,
4318 GST_TIME_ARGS (our_latency));
4320 /* we add some latency but can buffer an infinite amount of time */
4321 min_latency += our_latency;
4324 GST_DEBUG_OBJECT (jitterbuffer, "Calculated total latency : min %"
4325 GST_TIME_FORMAT " max %" GST_TIME_FORMAT,
4326 GST_TIME_ARGS (min_latency), GST_TIME_ARGS (max_latency));
4328 gst_query_set_latency (query, TRUE, min_latency, max_latency);
4332 case GST_QUERY_POSITION:
4334 GstClockTime start, last_out;
4337 gst_query_parse_position (query, &fmt, NULL);
4338 if (fmt != GST_FORMAT_TIME) {
4339 res = gst_pad_query_default (pad, parent, query);
4344 start = priv->npt_start;
4345 last_out = priv->last_out_time;
4348 GST_DEBUG_OBJECT (jitterbuffer, "npt start %" GST_TIME_FORMAT
4349 ", last out %" GST_TIME_FORMAT, GST_TIME_ARGS (start),
4350 GST_TIME_ARGS (last_out));
4352 if (GST_CLOCK_TIME_IS_VALID (start) && GST_CLOCK_TIME_IS_VALID (last_out)) {
4353 /* bring 0-based outgoing time to stream time */
4354 gst_query_set_position (query, GST_FORMAT_TIME, start + last_out);
4357 res = gst_pad_query_default (pad, parent, query);
4361 case GST_QUERY_CAPS:
4363 GstCaps *filter, *caps;
4365 gst_query_parse_caps (query, &filter);
4366 caps = gst_rtp_jitter_buffer_getcaps (pad, filter);
4367 gst_query_set_caps_result (query, caps);
4368 gst_caps_unref (caps);
4373 res = gst_pad_query_default (pad, parent, query);
4381 gst_rtp_jitter_buffer_set_property (GObject * object,
4382 guint prop_id, const GValue * value, GParamSpec * pspec)
4384 GstRtpJitterBuffer *jitterbuffer;
4385 GstRtpJitterBufferPrivate *priv;
4387 jitterbuffer = GST_RTP_JITTER_BUFFER (object);
4388 priv = jitterbuffer->priv;
4393 guint new_latency, old_latency;
4395 new_latency = g_value_get_uint (value);
4398 old_latency = priv->latency_ms;
4399 priv->latency_ms = new_latency;
4400 priv->latency_ns = priv->latency_ms * GST_MSECOND;
4401 rtp_jitter_buffer_set_delay (priv->jbuf, priv->latency_ns);
4404 /* post message if latency changed, this will inform the parent pipeline
4405 * that a latency reconfiguration is possible/needed. */
4406 if (new_latency != old_latency) {
4407 GST_DEBUG_OBJECT (jitterbuffer, "latency changed to: %" GST_TIME_FORMAT,
4408 GST_TIME_ARGS (new_latency * GST_MSECOND));
4410 gst_element_post_message (GST_ELEMENT_CAST (jitterbuffer),
4411 gst_message_new_latency (GST_OBJECT_CAST (jitterbuffer)));
4415 case PROP_DROP_ON_LATENCY:
4417 priv->drop_on_latency = g_value_get_boolean (value);
4420 case PROP_TS_OFFSET:
4422 priv->ts_offset = g_value_get_int64 (value);
4423 priv->ts_discont = TRUE;
4428 priv->do_lost = g_value_get_boolean (value);
4433 rtp_jitter_buffer_set_mode (priv->jbuf, g_value_get_enum (value));
4436 case PROP_DO_RETRANSMISSION:
4438 priv->do_retransmission = g_value_get_boolean (value);
4441 case PROP_RTX_NEXT_SEQNUM:
4443 priv->rtx_next_seqnum = g_value_get_boolean (value);
4446 case PROP_RTX_DELAY:
4448 priv->rtx_delay = g_value_get_int (value);
4451 case PROP_RTX_MIN_DELAY:
4453 priv->rtx_min_delay = g_value_get_uint (value);
4456 case PROP_RTX_DELAY_REORDER:
4458 priv->rtx_delay_reorder = g_value_get_int (value);
4461 case PROP_RTX_RETRY_TIMEOUT:
4463 priv->rtx_retry_timeout = g_value_get_int (value);
4466 case PROP_RTX_MIN_RETRY_TIMEOUT:
4468 priv->rtx_min_retry_timeout = g_value_get_int (value);
4471 case PROP_RTX_RETRY_PERIOD:
4473 priv->rtx_retry_period = g_value_get_int (value);
4476 case PROP_RTX_MAX_RETRIES:
4478 priv->rtx_max_retries = g_value_get_int (value);
4481 case PROP_RTX_DEADLINE:
4483 priv->rtx_deadline_ms = g_value_get_int (value);
4486 case PROP_RTX_STATS_TIMEOUT:
4488 priv->rtx_stats_timeout = g_value_get_uint (value);
4491 case PROP_MAX_RTCP_RTP_TIME_DIFF:
4493 priv->max_rtcp_rtp_time_diff = g_value_get_int (value);
4496 case PROP_MAX_DROPOUT_TIME:
4498 priv->max_dropout_time = g_value_get_uint (value);
4501 case PROP_MAX_MISORDER_TIME:
4503 priv->max_misorder_time = g_value_get_uint (value);
4506 case PROP_RFC7273_SYNC:
4508 rtp_jitter_buffer_set_rfc7273_sync (priv->jbuf,
4509 g_value_get_boolean (value));
4513 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
4519 gst_rtp_jitter_buffer_get_property (GObject * object,
4520 guint prop_id, GValue * value, GParamSpec * pspec)
4522 GstRtpJitterBuffer *jitterbuffer;
4523 GstRtpJitterBufferPrivate *priv;
4525 jitterbuffer = GST_RTP_JITTER_BUFFER (object);
4526 priv = jitterbuffer->priv;
4531 g_value_set_uint (value, priv->latency_ms);
4534 case PROP_DROP_ON_LATENCY:
4536 g_value_set_boolean (value, priv->drop_on_latency);
4539 case PROP_TS_OFFSET:
4541 g_value_set_int64 (value, priv->ts_offset);
4546 g_value_set_boolean (value, priv->do_lost);
4551 g_value_set_enum (value, rtp_jitter_buffer_get_mode (priv->jbuf));
4559 if (priv->srcresult != GST_FLOW_OK)
4562 percent = rtp_jitter_buffer_get_percent (priv->jbuf);
4564 g_value_set_int (value, percent);
4568 case PROP_DO_RETRANSMISSION:
4570 g_value_set_boolean (value, priv->do_retransmission);
4573 case PROP_RTX_NEXT_SEQNUM:
4575 g_value_set_boolean (value, priv->rtx_next_seqnum);
4578 case PROP_RTX_DELAY:
4580 g_value_set_int (value, priv->rtx_delay);
4583 case PROP_RTX_MIN_DELAY:
4585 g_value_set_uint (value, priv->rtx_min_delay);
4588 case PROP_RTX_DELAY_REORDER:
4590 g_value_set_int (value, priv->rtx_delay_reorder);
4593 case PROP_RTX_RETRY_TIMEOUT:
4595 g_value_set_int (value, priv->rtx_retry_timeout);
4598 case PROP_RTX_MIN_RETRY_TIMEOUT:
4600 g_value_set_int (value, priv->rtx_min_retry_timeout);
4603 case PROP_RTX_RETRY_PERIOD:
4605 g_value_set_int (value, priv->rtx_retry_period);
4608 case PROP_RTX_MAX_RETRIES:
4610 g_value_set_int (value, priv->rtx_max_retries);
4613 case PROP_RTX_DEADLINE:
4615 g_value_set_int (value, priv->rtx_deadline_ms);
4618 case PROP_RTX_STATS_TIMEOUT:
4620 g_value_set_uint (value, priv->rtx_stats_timeout);
4624 g_value_take_boxed (value,
4625 gst_rtp_jitter_buffer_create_stats (jitterbuffer));
4627 case PROP_MAX_RTCP_RTP_TIME_DIFF:
4629 g_value_set_int (value, priv->max_rtcp_rtp_time_diff);
4632 case PROP_MAX_DROPOUT_TIME:
4634 g_value_set_uint (value, priv->max_dropout_time);
4637 case PROP_MAX_MISORDER_TIME:
4639 g_value_set_uint (value, priv->max_misorder_time);
4642 case PROP_RFC7273_SYNC:
4644 g_value_set_boolean (value,
4645 rtp_jitter_buffer_get_rfc7273_sync (priv->jbuf));
4649 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
4654 static GstStructure *
4655 gst_rtp_jitter_buffer_create_stats (GstRtpJitterBuffer * jbuf)
4657 GstRtpJitterBufferPrivate *priv = jbuf->priv;
4661 s = gst_structure_new ("application/x-rtp-jitterbuffer-stats",
4662 "num-pushed", G_TYPE_UINT64, priv->num_pushed,
4663 "num-lost", G_TYPE_UINT64, priv->num_lost,
4664 "num-late", G_TYPE_UINT64, priv->num_late,
4665 "num-duplicates", G_TYPE_UINT64, priv->num_duplicates,
4666 "avg-jitter", G_TYPE_UINT64, priv->avg_jitter,
4667 "rtx-count", G_TYPE_UINT64, priv->num_rtx_requests,
4668 "rtx-success-count", G_TYPE_UINT64, priv->num_rtx_success,
4669 "rtx-per-packet", G_TYPE_DOUBLE, priv->avg_rtx_num,
4670 "rtx-rtt", G_TYPE_UINT64, priv->avg_rtx_rtt, NULL);