/* * Farsight Voice+Video library * * Copyright 2007 Collabora Ltd, * Copyright 2007 Nokia Corporation * @author: Philippe Kalaf . * Copyright 2007 Wim Taymans * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. * */ /** * SECTION:element-gstrtpjitterbuffer * * This element reorders and removes duplicate RTP packets as they are received * from a network source. It will also wait for missing packets up to a * configurable time limit using the #GstRtpJitterBuffer:latency property. * Packets arriving too late are considered to be lost packets. * * This element acts as a live element and so adds #GstRtpJitterBuffer:latency * to the pipeline. * * The element needs the clock-rate of the RTP payload in order to estimate the * delay. This information is obtained either from the caps on the sink pad or, * when no caps are present, from the #GstRtpJitterBuffer::request-pt-map signal. * To clear the previous pt-map use the #GstRtpJitterBuffer::clear-pt-map signal. * * This element will automatically be used inside gstrtpbin. * * * Example pipelines * |[ * gst-launch rtspsrc location=rtsp://192.168.1.133:8554/mpeg1or2AudioVideoTest ! gstrtpjitterbuffer ! rtpmpvdepay ! mpeg2dec ! xvimagesink * ]| Connect to a streaming server and decode the MPEG video. The jitterbuffer is * inserted into the pipeline to smooth out network jitter and to reorder the * out-of-order RTP packets. * * * Last reviewed on 2007-05-28 (0.10.5) */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include #include "gstrtpbin-marshal.h" #include "gstrtpjitterbuffer.h" #include "rtpjitterbuffer.h" #include "rtpstats.h" GST_DEBUG_CATEGORY (rtpjitterbuffer_debug); #define GST_CAT_DEFAULT (rtpjitterbuffer_debug) /* low and high threshold tell the queue when to start and stop buffering */ #define LOW_THRESHOLD 0.2 #define HIGH_THRESHOLD 0.8 /* elementfactory information */ static const GstElementDetails gst_rtp_jitter_buffer_details = GST_ELEMENT_DETAILS ("RTP packet jitter-buffer", "Filter/Network/RTP", "A buffer that deals with network jitter and other transmission faults", "Philippe Kalaf , " "Wim Taymans "); /* RTPJitterBuffer signals and args */ enum { SIGNAL_REQUEST_PT_MAP, SIGNAL_CLEAR_PT_MAP, LAST_SIGNAL }; #define DEFAULT_LATENCY_MS 200 #define DEFAULT_DROP_ON_LATENCY FALSE #define DEFAULT_TS_OFFSET 0 #define DEFAULT_DO_LOST FALSE enum { PROP_0, PROP_LATENCY, PROP_DROP_ON_LATENCY, PROP_TS_OFFSET, PROP_DO_LOST, PROP_LAST }; #define JBUF_LOCK(priv) (g_mutex_lock ((priv)->jbuf_lock)) #define JBUF_LOCK_CHECK(priv,label) G_STMT_START { \ JBUF_LOCK (priv); \ if (G_UNLIKELY (priv->srcresult != GST_FLOW_OK)) \ goto label; \ } G_STMT_END #define JBUF_UNLOCK(priv) (g_mutex_unlock ((priv)->jbuf_lock)) #define JBUF_WAIT(priv) (g_cond_wait ((priv)->jbuf_cond, (priv)->jbuf_lock)) #define JBUF_WAIT_CHECK(priv,label) G_STMT_START { \ JBUF_WAIT(priv); \ if (G_UNLIKELY (priv->srcresult != GST_FLOW_OK)) \ goto label; \ } G_STMT_END #define JBUF_SIGNAL(priv) (g_cond_signal ((priv)->jbuf_cond)) struct _GstRtpJitterBufferPrivate { GstPad *sinkpad, *srcpad; RTPJitterBuffer *jbuf; GMutex *jbuf_lock; GCond *jbuf_cond; gboolean waiting; gboolean discont; /* properties */ guint latency_ms; gboolean drop_on_latency; gint64 ts_offset; gboolean do_lost; /* the last seqnum we pushed out */ guint32 last_popped_seqnum; /* the next expected seqnum */ guint32 next_seqnum; /* last output time */ GstClockTime last_out_time; /* state */ gboolean eos; /* clock rate and rtp timestamp offset */ gint last_pt; gint32 clock_rate; gint64 clock_base; gint64 prev_ts_offset; /* when we are shutting down */ GstFlowReturn srcresult; gboolean blocked; /* for sync */ GstSegment segment; GstClockID clock_id; /* the latency of the upstream peer, we have to take this into account when * synchronizing the buffers. */ GstClockTime peer_latency; /* some accounting */ guint64 num_late; guint64 num_duplicates; }; #define GST_RTP_JITTER_BUFFER_GET_PRIVATE(o) \ (G_TYPE_INSTANCE_GET_PRIVATE ((o), GST_TYPE_RTP_JITTER_BUFFER, \ GstRtpJitterBufferPrivate)) static GstStaticPadTemplate gst_rtp_jitter_buffer_sink_template = GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS ("application/x-rtp, " "clock-rate = (int) [ 1, 2147483647 ]" /* "payload = (int) , " * "encoding-name = (string) " */ ) ); static GstStaticPadTemplate gst_rtp_jitter_buffer_src_template = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS ("application/x-rtp" /* "payload = (int) , " * "clock-rate = (int) , " * "encoding-name = (string) " */ ) ); static guint gst_rtp_jitter_buffer_signals[LAST_SIGNAL] = { 0 }; GST_BOILERPLATE (GstRtpJitterBuffer, gst_rtp_jitter_buffer, GstElement, GST_TYPE_ELEMENT); /* object overrides */ static void gst_rtp_jitter_buffer_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static void gst_rtp_jitter_buffer_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); static void gst_rtp_jitter_buffer_finalize (GObject * object); /* element overrides */ static GstStateChangeReturn gst_rtp_jitter_buffer_change_state (GstElement * element, GstStateChange transition); /* pad overrides */ static GstCaps *gst_rtp_jitter_buffer_getcaps (GstPad * pad); /* sinkpad overrides */ static gboolean gst_jitter_buffer_sink_setcaps (GstPad * pad, GstCaps * caps); static gboolean gst_rtp_jitter_buffer_src_event (GstPad * pad, GstEvent * event); static gboolean gst_rtp_jitter_buffer_sink_event (GstPad * pad, GstEvent * event); static GstFlowReturn gst_rtp_jitter_buffer_chain (GstPad * pad, GstBuffer * buffer); /* srcpad overrides */ static gboolean gst_rtp_jitter_buffer_src_activate_push (GstPad * pad, gboolean active); static void gst_rtp_jitter_buffer_loop (GstRtpJitterBuffer * jitterbuffer); static gboolean gst_rtp_jitter_buffer_query (GstPad * pad, GstQuery * query); static void gst_rtp_jitter_buffer_clear_pt_map (GstRtpJitterBuffer * jitterbuffer); static void gst_rtp_jitter_buffer_base_init (gpointer klass) { GstElementClass *element_class = GST_ELEMENT_CLASS (klass); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&gst_rtp_jitter_buffer_src_template)); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&gst_rtp_jitter_buffer_sink_template)); gst_element_class_set_details (element_class, &gst_rtp_jitter_buffer_details); } static void gst_rtp_jitter_buffer_class_init (GstRtpJitterBufferClass * klass) { GObjectClass *gobject_class; GstElementClass *gstelement_class; gobject_class = (GObjectClass *) klass; gstelement_class = (GstElementClass *) klass; g_type_class_add_private (klass, sizeof (GstRtpJitterBufferPrivate)); gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_rtp_jitter_buffer_finalize); gobject_class->set_property = gst_rtp_jitter_buffer_set_property; gobject_class->get_property = gst_rtp_jitter_buffer_get_property; /** * GstRtpJitterBuffer::latency: * * The maximum latency of the jitterbuffer. Packets will be kept in the buffer * for at most this time. */ g_object_class_install_property (gobject_class, PROP_LATENCY, g_param_spec_uint ("latency", "Buffer latency in ms", "Amount of ms to buffer", 0, G_MAXUINT, DEFAULT_LATENCY_MS, G_PARAM_READWRITE)); /** * GstRtpJitterBuffer::drop-on-latency: * * Drop oldest buffers when the queue is completely filled. */ g_object_class_install_property (gobject_class, PROP_DROP_ON_LATENCY, g_param_spec_boolean ("drop-on-latency", "Drop buffers when maximum latency is reached", "Tells the jitterbuffer to never exceed the given latency in size", DEFAULT_DROP_ON_LATENCY, G_PARAM_READWRITE)); /** * GstRtpJitterBuffer::ts-offset: * * Adjust GStreamer output buffer timestamps in the jitterbuffer with offset. * This is mainly used to ensure interstream synchronisation. */ g_object_class_install_property (gobject_class, PROP_TS_OFFSET, g_param_spec_int64 ("ts-offset", "Timestamp Offset", "Adjust buffer timestamps with offset in nanoseconds", G_MININT64, G_MAXINT64, DEFAULT_TS_OFFSET, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); /** * GstRtpJitterBuffer::do-lost: * * Send out a GstRTPPacketLost event downstream when a packet is considered * lost. */ g_object_class_install_property (gobject_class, PROP_DO_LOST, g_param_spec_boolean ("do-lost", "Do Lost", "Send an event downstream when a packet is lost", DEFAULT_DO_LOST, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); /** * GstRtpJitterBuffer::request-pt-map: * @buffer: the object which received the signal * @pt: the pt * * Request the payload type as #GstCaps for @pt. */ gst_rtp_jitter_buffer_signals[SIGNAL_REQUEST_PT_MAP] = g_signal_new ("request-pt-map", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstRtpJitterBufferClass, request_pt_map), NULL, NULL, gst_rtp_bin_marshal_BOXED__UINT, GST_TYPE_CAPS, 1, G_TYPE_UINT); /** * GstRtpJitterBuffer::clear-pt-map: * @buffer: the object which received the signal * * Invalidate the clock-rate as obtained with the * #GstRtpJitterBuffer::request-pt-map signal. */ gst_rtp_jitter_buffer_signals[SIGNAL_CLEAR_PT_MAP] = g_signal_new ("clear-pt-map", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstRtpJitterBufferClass, clear_pt_map), NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0, G_TYPE_NONE); gstelement_class->change_state = gst_rtp_jitter_buffer_change_state; klass->clear_pt_map = GST_DEBUG_FUNCPTR (gst_rtp_jitter_buffer_clear_pt_map); GST_DEBUG_CATEGORY_INIT (rtpjitterbuffer_debug, "gstrtpjitterbuffer", 0, "RTP Jitter Buffer"); } static void gst_rtp_jitter_buffer_init (GstRtpJitterBuffer * jitterbuffer, GstRtpJitterBufferClass * klass) { GstRtpJitterBufferPrivate *priv; priv = GST_RTP_JITTER_BUFFER_GET_PRIVATE (jitterbuffer); jitterbuffer->priv = priv; priv->latency_ms = DEFAULT_LATENCY_MS; priv->drop_on_latency = DEFAULT_DROP_ON_LATENCY; priv->do_lost = DEFAULT_DO_LOST; priv->jbuf = rtp_jitter_buffer_new (); priv->jbuf_lock = g_mutex_new (); priv->jbuf_cond = g_cond_new (); priv->srcpad = gst_pad_new_from_static_template (&gst_rtp_jitter_buffer_src_template, "src"); gst_pad_set_activatepush_function (priv->srcpad, GST_DEBUG_FUNCPTR (gst_rtp_jitter_buffer_src_activate_push)); gst_pad_set_query_function (priv->srcpad, GST_DEBUG_FUNCPTR (gst_rtp_jitter_buffer_query)); gst_pad_set_getcaps_function (priv->srcpad, GST_DEBUG_FUNCPTR (gst_rtp_jitter_buffer_getcaps)); gst_pad_set_event_function (priv->srcpad, GST_DEBUG_FUNCPTR (gst_rtp_jitter_buffer_src_event)); priv->sinkpad = gst_pad_new_from_static_template (&gst_rtp_jitter_buffer_sink_template, "sink"); gst_pad_set_chain_function (priv->sinkpad, GST_DEBUG_FUNCPTR (gst_rtp_jitter_buffer_chain)); gst_pad_set_event_function (priv->sinkpad, GST_DEBUG_FUNCPTR (gst_rtp_jitter_buffer_sink_event)); gst_pad_set_setcaps_function (priv->sinkpad, GST_DEBUG_FUNCPTR (gst_jitter_buffer_sink_setcaps)); gst_pad_set_getcaps_function (priv->sinkpad, GST_DEBUG_FUNCPTR (gst_rtp_jitter_buffer_getcaps)); gst_element_add_pad (GST_ELEMENT (jitterbuffer), priv->srcpad); gst_element_add_pad (GST_ELEMENT (jitterbuffer), priv->sinkpad); } static void gst_rtp_jitter_buffer_finalize (GObject * object) { GstRtpJitterBuffer *jitterbuffer; jitterbuffer = GST_RTP_JITTER_BUFFER (object); g_mutex_free (jitterbuffer->priv->jbuf_lock); g_cond_free (jitterbuffer->priv->jbuf_cond); g_object_unref (jitterbuffer->priv->jbuf); G_OBJECT_CLASS (parent_class)->finalize (object); } static void gst_rtp_jitter_buffer_clear_pt_map (GstRtpJitterBuffer * jitterbuffer) { GstRtpJitterBufferPrivate *priv; priv = jitterbuffer->priv; /* this will trigger a new pt-map request signal, FIXME, do something better. */ priv->clock_rate = -1; } static GstCaps * gst_rtp_jitter_buffer_getcaps (GstPad * pad) { GstRtpJitterBuffer *jitterbuffer; GstRtpJitterBufferPrivate *priv; GstPad *other; GstCaps *caps; const GstCaps *templ; jitterbuffer = GST_RTP_JITTER_BUFFER (gst_pad_get_parent (pad)); priv = jitterbuffer->priv; other = (pad == priv->srcpad ? priv->sinkpad : priv->srcpad); caps = gst_pad_peer_get_caps (other); templ = gst_pad_get_pad_template_caps (pad); if (caps == NULL) { GST_DEBUG_OBJECT (jitterbuffer, "copy template"); caps = gst_caps_copy (templ); } else { GstCaps *intersect; GST_DEBUG_OBJECT (jitterbuffer, "intersect with template"); intersect = gst_caps_intersect (caps, templ); gst_caps_unref (caps); caps = intersect; } gst_object_unref (jitterbuffer); return caps; } static gboolean gst_jitter_buffer_sink_parse_caps (GstRtpJitterBuffer * jitterbuffer, GstCaps * caps) { GstRtpJitterBufferPrivate *priv; GstStructure *caps_struct; guint val; priv = jitterbuffer->priv; /* first parse the caps */ caps_struct = gst_caps_get_structure (caps, 0); GST_DEBUG_OBJECT (jitterbuffer, "got caps"); /* we need a clock-rate to convert the rtp timestamps to GStreamer time and to * measure the amount of data in the buffer */ if (!gst_structure_get_int (caps_struct, "clock-rate", &priv->clock_rate)) goto error; if (priv->clock_rate <= 0) goto wrong_rate; GST_DEBUG_OBJECT (jitterbuffer, "got clock-rate %d", priv->clock_rate); /* gah, clock-base is uint. If we don't have a base, we will use the first * buffer timestamp as the base time. This will screw up sync but it's better * than nothing. */ if (gst_structure_get_uint (caps_struct, "clock-base", &val)) priv->clock_base = val; else priv->clock_base = -1; GST_DEBUG_OBJECT (jitterbuffer, "got clock-base %" G_GINT64_FORMAT, priv->clock_base); /* first expected seqnum, only update when we didn't have a previous base. */ if (priv->next_seqnum == -1) { if (gst_structure_get_uint (caps_struct, "seqnum-base", &val)) priv->next_seqnum = val; else priv->next_seqnum = -1; } GST_DEBUG_OBJECT (jitterbuffer, "got seqnum-base %d", priv->next_seqnum); return TRUE; /* ERRORS */ error: { GST_DEBUG_OBJECT (jitterbuffer, "No clock-rate in caps!"); return FALSE; } wrong_rate: { GST_DEBUG_OBJECT (jitterbuffer, "Invalid clock-rate %d", priv->clock_rate); return FALSE; } } static gboolean gst_jitter_buffer_sink_setcaps (GstPad * pad, GstCaps * caps) { GstRtpJitterBuffer *jitterbuffer; GstRtpJitterBufferPrivate *priv; gboolean res; jitterbuffer = GST_RTP_JITTER_BUFFER (gst_pad_get_parent (pad)); priv = jitterbuffer->priv; res = gst_jitter_buffer_sink_parse_caps (jitterbuffer, caps); /* set same caps on srcpad on success */ if (res) gst_pad_set_caps (priv->srcpad, caps); gst_object_unref (jitterbuffer); return res; } static void gst_rtp_jitter_buffer_flush_start (GstRtpJitterBuffer * jitterbuffer) { GstRtpJitterBufferPrivate *priv; priv = jitterbuffer->priv; JBUF_LOCK (priv); /* mark ourselves as flushing */ priv->srcresult = GST_FLOW_WRONG_STATE; GST_DEBUG_OBJECT (jitterbuffer, "Disabling pop on queue"); /* this unblocks any waiting pops on the src pad task */ JBUF_SIGNAL (priv); /* unlock clock, we just unschedule, the entry will be released by the * locking streaming thread. */ if (priv->clock_id) gst_clock_id_unschedule (priv->clock_id); JBUF_UNLOCK (priv); } static void gst_rtp_jitter_buffer_flush_stop (GstRtpJitterBuffer * jitterbuffer) { GstRtpJitterBufferPrivate *priv; priv = jitterbuffer->priv; JBUF_LOCK (priv); GST_DEBUG_OBJECT (jitterbuffer, "Enabling pop on queue"); /* Mark as non flushing */ priv->srcresult = GST_FLOW_OK; gst_segment_init (&priv->segment, GST_FORMAT_TIME); priv->last_popped_seqnum = -1; priv->last_out_time = -1; priv->next_seqnum = -1; priv->clock_rate = -1; priv->eos = FALSE; rtp_jitter_buffer_flush (priv->jbuf); rtp_jitter_buffer_reset_skew (priv->jbuf); JBUF_UNLOCK (priv); } static gboolean gst_rtp_jitter_buffer_src_activate_push (GstPad * pad, gboolean active) { gboolean result = TRUE; GstRtpJitterBuffer *jitterbuffer = NULL; jitterbuffer = GST_RTP_JITTER_BUFFER (gst_pad_get_parent (pad)); if (active) { /* allow data processing */ gst_rtp_jitter_buffer_flush_stop (jitterbuffer); /* start pushing out buffers */ GST_DEBUG_OBJECT (jitterbuffer, "Starting task on srcpad"); gst_pad_start_task (jitterbuffer->priv->srcpad, (GstTaskFunction) gst_rtp_jitter_buffer_loop, jitterbuffer); } else { /* make sure all data processing stops ASAP */ gst_rtp_jitter_buffer_flush_start (jitterbuffer); /* NOTE this will hardlock if the state change is called from the src pad * task thread because we will _join() the thread. */ GST_DEBUG_OBJECT (jitterbuffer, "Stopping task on srcpad"); result = gst_pad_stop_task (pad); } gst_object_unref (jitterbuffer); return result; } static GstStateChangeReturn gst_rtp_jitter_buffer_change_state (GstElement * element, GstStateChange transition) { GstRtpJitterBuffer *jitterbuffer; GstRtpJitterBufferPrivate *priv; GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS; jitterbuffer = GST_RTP_JITTER_BUFFER (element); priv = jitterbuffer->priv; switch (transition) { case GST_STATE_CHANGE_NULL_TO_READY: break; case GST_STATE_CHANGE_READY_TO_PAUSED: JBUF_LOCK (priv); /* reset negotiated values */ priv->clock_rate = -1; priv->clock_base = -1; priv->peer_latency = 0; priv->last_pt = -1; /* block until we go to PLAYING */ priv->blocked = TRUE; /* reset skew detection initialy */ rtp_jitter_buffer_reset_skew (priv->jbuf); JBUF_UNLOCK (priv); break; case GST_STATE_CHANGE_PAUSED_TO_PLAYING: JBUF_LOCK (priv); /* unblock to allow streaming in PLAYING */ priv->blocked = FALSE; JBUF_SIGNAL (priv); JBUF_UNLOCK (priv); break; default: break; } ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition); switch (transition) { case GST_STATE_CHANGE_READY_TO_PAUSED: /* we are a live element because we sync to the clock, which we can only * do in the PLAYING state */ if (ret != GST_STATE_CHANGE_FAILURE) ret = GST_STATE_CHANGE_NO_PREROLL; break; case GST_STATE_CHANGE_PLAYING_TO_PAUSED: JBUF_LOCK (priv); /* block to stop streaming when PAUSED */ priv->blocked = TRUE; JBUF_UNLOCK (priv); if (ret != GST_STATE_CHANGE_FAILURE) ret = GST_STATE_CHANGE_NO_PREROLL; break; case GST_STATE_CHANGE_PAUSED_TO_READY: break; case GST_STATE_CHANGE_READY_TO_NULL: break; default: break; } return ret; } static gboolean gst_rtp_jitter_buffer_src_event (GstPad * pad, GstEvent * event) { gboolean ret = TRUE; GstRtpJitterBuffer *jitterbuffer; GstRtpJitterBufferPrivate *priv; jitterbuffer = GST_RTP_JITTER_BUFFER (gst_pad_get_parent (pad)); priv = jitterbuffer->priv; GST_DEBUG_OBJECT (jitterbuffer, "received %s", GST_EVENT_TYPE_NAME (event)); switch (GST_EVENT_TYPE (event)) { default: ret = gst_pad_push_event (priv->sinkpad, event); break; } gst_object_unref (jitterbuffer); return ret; } static gboolean gst_rtp_jitter_buffer_sink_event (GstPad * pad, GstEvent * event) { gboolean ret = TRUE; GstRtpJitterBuffer *jitterbuffer; GstRtpJitterBufferPrivate *priv; jitterbuffer = GST_RTP_JITTER_BUFFER (gst_pad_get_parent (pad)); priv = jitterbuffer->priv; GST_DEBUG_OBJECT (jitterbuffer, "received %s", GST_EVENT_TYPE_NAME (event)); switch (GST_EVENT_TYPE (event)) { case GST_EVENT_NEWSEGMENT: { GstFormat format; gdouble rate, arate; gint64 start, stop, time; gboolean update; gst_event_parse_new_segment_full (event, &update, &rate, &arate, &format, &start, &stop, &time); /* we need time for now */ if (format != GST_FORMAT_TIME) goto newseg_wrong_format; GST_DEBUG_OBJECT (jitterbuffer, "newsegment: update %d, rate %g, arate %g, start %" GST_TIME_FORMAT ", stop %" GST_TIME_FORMAT ", time %" GST_TIME_FORMAT, update, rate, arate, GST_TIME_ARGS (start), GST_TIME_ARGS (stop), GST_TIME_ARGS (time)); /* now configure the values, we need these to time the release of the * buffers on the srcpad. */ gst_segment_set_newsegment_full (&priv->segment, update, rate, arate, format, start, stop, time); /* FIXME, push SEGMENT in the queue. Sorting order might be difficult. */ ret = gst_pad_push_event (priv->srcpad, event); break; } case GST_EVENT_FLUSH_START: gst_rtp_jitter_buffer_flush_start (jitterbuffer); ret = gst_pad_push_event (priv->srcpad, event); break; case GST_EVENT_FLUSH_STOP: ret = gst_pad_push_event (priv->srcpad, event); ret = gst_rtp_jitter_buffer_src_activate_push (priv->srcpad, TRUE); break; case GST_EVENT_EOS: { /* push EOS in queue. We always push it at the head */ JBUF_LOCK (priv); /* check for flushing, we need to discard the event and return FALSE when * we are flushing */ ret = priv->srcresult == GST_FLOW_OK; if (ret && !priv->eos) { GST_DEBUG_OBJECT (jitterbuffer, "queuing EOS"); priv->eos = TRUE; JBUF_SIGNAL (priv); } else if (priv->eos) { GST_DEBUG_OBJECT (jitterbuffer, "dropping EOS, we are already EOS"); } else { GST_DEBUG_OBJECT (jitterbuffer, "dropping EOS, reason %s", gst_flow_get_name (priv->srcresult)); } JBUF_UNLOCK (priv); gst_event_unref (event); break; } default: ret = gst_pad_push_event (priv->srcpad, event); break; } done: gst_object_unref (jitterbuffer); return ret; /* ERRORS */ newseg_wrong_format: { GST_DEBUG_OBJECT (jitterbuffer, "received non TIME newsegment"); ret = FALSE; goto done; } } static gboolean gst_rtp_jitter_buffer_get_clock_rate (GstRtpJitterBuffer * jitterbuffer, guint8 pt) { GValue ret = { 0 }; GValue args[2] = { {0}, {0} }; GstCaps *caps; gboolean res; g_value_init (&args[0], GST_TYPE_ELEMENT); g_value_set_object (&args[0], jitterbuffer); g_value_init (&args[1], G_TYPE_UINT); g_value_set_uint (&args[1], pt); g_value_init (&ret, GST_TYPE_CAPS); g_value_set_boxed (&ret, NULL); g_signal_emitv (args, gst_rtp_jitter_buffer_signals[SIGNAL_REQUEST_PT_MAP], 0, &ret); g_value_unset (&args[0]); g_value_unset (&args[1]); caps = (GstCaps *) g_value_dup_boxed (&ret); g_value_unset (&ret); if (!caps) goto no_caps; res = gst_jitter_buffer_sink_parse_caps (jitterbuffer, caps); gst_caps_unref (caps); return res; /* ERRORS */ no_caps: { GST_DEBUG_OBJECT (jitterbuffer, "could not get caps"); return FALSE; } } static GstFlowReturn gst_rtp_jitter_buffer_chain (GstPad * pad, GstBuffer * buffer) { GstRtpJitterBuffer *jitterbuffer; GstRtpJitterBufferPrivate *priv; guint16 seqnum; GstFlowReturn ret = GST_FLOW_OK; GstClockTime timestamp; guint64 latency_ts; gboolean tail; jitterbuffer = GST_RTP_JITTER_BUFFER (gst_pad_get_parent (pad)); if (G_UNLIKELY (!gst_rtp_buffer_validate (buffer))) goto invalid_buffer; priv = jitterbuffer->priv; if (G_UNLIKELY (priv->last_pt != gst_rtp_buffer_get_payload_type (buffer))) { GstCaps *caps; priv->last_pt = gst_rtp_buffer_get_payload_type (buffer); /* reset clock-rate so that we get a new one */ priv->clock_rate = -1; /* Try to get the clock-rate from the caps first if we can. If there are no * caps we must fire the signal to get the clock-rate. */ if ((caps = GST_BUFFER_CAPS (buffer))) { gst_jitter_buffer_sink_parse_caps (jitterbuffer, caps); } } if (G_UNLIKELY (priv->clock_rate == -1)) { guint8 pt; /* no clock rate given on the caps, try to get one with the signal */ pt = gst_rtp_buffer_get_payload_type (buffer); gst_rtp_jitter_buffer_get_clock_rate (jitterbuffer, pt); if (G_UNLIKELY (priv->clock_rate == -1)) goto not_negotiated; } /* take the timestamp of the buffer. This is the time when the packet was * received and is used to calculate jitter and clock skew. We will adjust * this timestamp with the smoothed value after processing it in the * jitterbuffer. */ timestamp = GST_BUFFER_TIMESTAMP (buffer); /* bring to running time */ timestamp = gst_segment_to_running_time (&priv->segment, GST_FORMAT_TIME, timestamp); seqnum = gst_rtp_buffer_get_seq (buffer); GST_DEBUG_OBJECT (jitterbuffer, "Received packet #%d at time %" GST_TIME_FORMAT, seqnum, GST_TIME_ARGS (timestamp)); JBUF_LOCK_CHECK (priv, out_flushing); /* don't accept more data on EOS */ if (G_UNLIKELY (priv->eos)) goto have_eos; /* let's check if this buffer is too late, we can only accept packets with * bigger seqnum than the one we last pushed. */ if (G_LIKELY (priv->last_popped_seqnum != -1)) { gint gap; gboolean reset = FALSE; gap = gst_rtp_buffer_compare_seqnum (priv->last_popped_seqnum, seqnum); if (G_UNLIKELY (gap <= 0)) { /* priv->last_popped_seqnum >= seqnum, this packet is too late or the * sender might have been restarted with different seqnum. */ if (gap < -RTP_MAX_MISORDER) { GST_DEBUG_OBJECT (jitterbuffer, "reset: buffer too old %d", gap); reset = TRUE; } else { goto too_late; } } else { /* priv->last_popped_seqnum < seqnum, this is a new packet */ if (G_UNLIKELY (gap > RTP_MAX_DROPOUT)) { GST_DEBUG_OBJECT (jitterbuffer, "reset: too many dropped packets %d", gap); reset = TRUE; } else { GST_DEBUG_OBJECT (jitterbuffer, "dropped packets %d but <= %d", gap, RTP_MAX_DROPOUT); } } if (G_UNLIKELY (reset)) { priv->last_popped_seqnum = -1; priv->next_seqnum = -1; rtp_jitter_buffer_reset_skew (priv->jbuf); } } /* let's drop oldest packet if the queue is already full and drop-on-latency * is set. We can only do this when there actually is a latency. When no * latency is set, we just pump it in the queue and let the other end push it * out as fast as possible. */ if (priv->latency_ms && priv->drop_on_latency) { latency_ts = gst_util_uint64_scale_int (priv->latency_ms, priv->clock_rate, 1000); if (G_UNLIKELY (rtp_jitter_buffer_get_ts_diff (priv->jbuf) >= latency_ts)) { GstBuffer *old_buf; old_buf = rtp_jitter_buffer_pop (priv->jbuf); GST_DEBUG_OBJECT (jitterbuffer, "Queue full, dropping old packet #%d", gst_rtp_buffer_get_seq (old_buf)); gst_buffer_unref (old_buf); } } /* we need to make the metadata writable before pushing it in the jitterbuffer * because the jitterbuffer will update the timestamp */ buffer = gst_buffer_make_metadata_writable (buffer); /* now insert the packet into the queue in sorted order. This function returns * FALSE if a packet with the same seqnum was already in the queue, meaning we * have a duplicate. */ if (G_UNLIKELY (!rtp_jitter_buffer_insert (priv->jbuf, buffer, timestamp, priv->clock_rate, &tail))) goto duplicate; /* signal addition of new buffer when the _loop is waiting. */ if (priv->waiting) JBUF_SIGNAL (priv); /* let's unschedule and unblock any waiting buffers. We only want to do this * when the tail buffer changed */ if (G_UNLIKELY (priv->clock_id && tail)) { GST_DEBUG_OBJECT (jitterbuffer, "Unscheduling waiting buffer, new tail buffer"); gst_clock_id_unschedule (priv->clock_id); } GST_DEBUG_OBJECT (jitterbuffer, "Pushed packet #%d, now %d packets", seqnum, rtp_jitter_buffer_num_packets (priv->jbuf)); finished: JBUF_UNLOCK (priv); gst_object_unref (jitterbuffer); return ret; /* ERRORS */ invalid_buffer: { /* this is not fatal but should be filtered earlier */ GST_ELEMENT_WARNING (jitterbuffer, STREAM, DECODE, (NULL), ("Received invalid RTP payload, dropping")); gst_buffer_unref (buffer); gst_object_unref (jitterbuffer); return GST_FLOW_OK; } not_negotiated: { GST_WARNING_OBJECT (jitterbuffer, "No clock-rate in caps!"); gst_buffer_unref (buffer); gst_object_unref (jitterbuffer); return GST_FLOW_OK; } out_flushing: { ret = priv->srcresult; GST_DEBUG_OBJECT (jitterbuffer, "flushing %s", gst_flow_get_name (ret)); gst_buffer_unref (buffer); goto finished; } have_eos: { ret = GST_FLOW_UNEXPECTED; GST_WARNING_OBJECT (jitterbuffer, "we are EOS, refusing buffer"); gst_buffer_unref (buffer); goto finished; } too_late: { GST_WARNING_OBJECT (jitterbuffer, "Packet #%d too late as #%d was already" " popped, dropping", seqnum, priv->last_popped_seqnum); priv->num_late++; gst_buffer_unref (buffer); goto finished; } duplicate: { GST_WARNING_OBJECT (jitterbuffer, "Duplicate packet #%d detected, dropping", seqnum); priv->num_duplicates++; gst_buffer_unref (buffer); goto finished; } } static GstClockTime apply_offset (GstRtpJitterBuffer * jitterbuffer, GstClockTime timestamp) { GstRtpJitterBufferPrivate *priv; priv = jitterbuffer->priv; if (timestamp == -1) return -1; /* apply the timestamp offset */ timestamp += priv->ts_offset; return timestamp; } /** * This funcion will push out buffers on the source pad. * * For each pushed buffer, the seqnum is recorded, if the next buffer B has a * different seqnum (missing packets before B), this function will wait for the * missing packet to arrive up to the timestamp of buffer B. */ static void gst_rtp_jitter_buffer_loop (GstRtpJitterBuffer * jitterbuffer) { GstRtpJitterBufferPrivate *priv; GstBuffer *outbuf; GstFlowReturn result; guint16 seqnum; guint32 next_seqnum; GstClockTime timestamp, out_time; gboolean discont = FALSE; gint gap; priv = jitterbuffer->priv; JBUF_LOCK_CHECK (priv, flushing); again: GST_DEBUG_OBJECT (jitterbuffer, "Peeking item"); while (TRUE) { /* always wait if we are blocked */ if (G_LIKELY (!priv->blocked)) { /* if we have a packet, we can exit the loop and grab it */ if (rtp_jitter_buffer_num_packets (priv->jbuf) > 0) break; /* no packets but we are EOS, do eos logic */ if (G_UNLIKELY (priv->eos)) goto do_eos; } /* underrun, wait for packets or flushing now */ priv->waiting = TRUE; JBUF_WAIT_CHECK (priv, flushing); priv->waiting = FALSE; } /* peek a buffer, we're just looking at the timestamp and the sequence number. * If all is fine, we'll pop and push it. If the sequence number is wrong we * wait on the timestamp. In the chain function we will unlock the wait when a * new buffer is available. The peeked buffer is valid for as long as we hold * the jitterbuffer lock. */ outbuf = rtp_jitter_buffer_peek (priv->jbuf); /* get the seqnum and the next expected seqnum */ seqnum = gst_rtp_buffer_get_seq (outbuf); next_seqnum = priv->next_seqnum; /* get the timestamp, this is already corrected for clock skew by the * jitterbuffer */ timestamp = GST_BUFFER_TIMESTAMP (outbuf); GST_DEBUG_OBJECT (jitterbuffer, "Peeked buffer #%d, expect #%d, timestamp %" GST_TIME_FORMAT ", now %d left", seqnum, next_seqnum, GST_TIME_ARGS (timestamp), rtp_jitter_buffer_num_packets (priv->jbuf)); /* apply our timestamp offset to the incomming buffer, this will be our output * timestamp. */ out_time = apply_offset (jitterbuffer, timestamp); /* get the gap between this and the previous packet. If we don't know the * previous packet seqnum assume no gap. */ if (G_LIKELY (next_seqnum != -1)) { gap = gst_rtp_buffer_compare_seqnum (next_seqnum, seqnum); /* if we have a packet that we already pushed or considered dropped, pop it * off and get the next packet */ if (G_UNLIKELY (gap < 0)) { GST_DEBUG_OBJECT (jitterbuffer, "Old packet #%d, next #%d dropping", seqnum, next_seqnum); outbuf = rtp_jitter_buffer_pop (priv->jbuf); gst_buffer_unref (outbuf); goto again; } } else { GST_DEBUG_OBJECT (jitterbuffer, "no next seqnum known, first packet"); gap = -1; } /* If we don't know what the next seqnum should be (== -1) we have to wait * because it might be possible that we are not receiving this buffer in-order, * a buffer with a lower seqnum could arrive later and we want to push that * earlier buffer before this buffer then. * If we know the expected seqnum, we can compare it to the current seqnum to * determine if we have missing a packet. If we have a missing packet (which * must be before this packet) we can wait for it until the deadline for this * packet expires. */ if (G_UNLIKELY (gap != 0 && out_time != -1)) { GstClockID id; GstClockTime sync_time; GstClockReturn ret; GstClock *clock; GstClockTime duration = GST_CLOCK_TIME_NONE; if (gap > 0) { /* we have a gap */ GST_WARNING_OBJECT (jitterbuffer, "Sequence number GAP detected: expected %d instead of %d (%d missing)", next_seqnum, seqnum, gap); if (priv->last_out_time != -1) { GST_DEBUG_OBJECT (jitterbuffer, "out_time %" GST_TIME_FORMAT ", last %" GST_TIME_FORMAT, GST_TIME_ARGS (out_time), GST_TIME_ARGS (priv->last_out_time)); /* interpolate between the current time and the last time based on * number of packets we are missing, this is the estimated duration * for the missing packet based on equidistant packet spacing. Also make * sure we never go negative. */ if (out_time > priv->last_out_time) duration = (out_time - priv->last_out_time) / (gap + 1); else goto lost; GST_DEBUG_OBJECT (jitterbuffer, "duration %" GST_TIME_FORMAT, GST_TIME_ARGS (duration)); /* add this duration to the timestamp of the last packet we pushed */ out_time = (priv->last_out_time + duration); } } else { /* we don't know what the next_seqnum should be, wait for the last * possible moment to push this buffer, maybe we get an earlier seqnum * while we wait */ GST_DEBUG_OBJECT (jitterbuffer, "First buffer %d, do sync", seqnum); } GST_OBJECT_LOCK (jitterbuffer); clock = GST_ELEMENT_CLOCK (jitterbuffer); if (!clock) { GST_OBJECT_UNLOCK (jitterbuffer); /* let's just push if there is no clock */ goto push_buffer; } GST_DEBUG_OBJECT (jitterbuffer, "sync to timestamp %" GST_TIME_FORMAT, GST_TIME_ARGS (out_time)); /* prepare for sync against clock */ sync_time = out_time + GST_ELEMENT_CAST (jitterbuffer)->base_time; /* add latency, this includes our own latency and the peer latency. */ sync_time += (priv->latency_ms * GST_MSECOND); sync_time += priv->peer_latency; /* create an entry for the clock */ id = priv->clock_id = gst_clock_new_single_shot_id (clock, sync_time); GST_OBJECT_UNLOCK (jitterbuffer); /* release the lock so that the other end can push stuff or unlock */ JBUF_UNLOCK (priv); ret = gst_clock_id_wait (id, NULL); JBUF_LOCK (priv); /* and free the entry */ gst_clock_id_unref (id); priv->clock_id = NULL; /* at this point, the clock could have been unlocked by a timeout, a new * tail element was added to the queue or because we are shutting down. Check * for shutdown first. */ if G_UNLIKELY ((priv->srcresult != GST_FLOW_OK)) goto flushing; /* if we got unscheduled and we are not flushing, it's because a new tail * element became available in the queue. Grab it and try to push or sync. */ if (ret == GST_CLOCK_UNSCHEDULED) { GST_DEBUG_OBJECT (jitterbuffer, "Wait got unscheduled, will retry to push with new buffer"); goto again; } lost: /* we now timed out, this means we lost a packet or finished synchronizing * on the first buffer. */ if (gap > 0) { GstEvent *event; /* we had a gap and thus we lost a packet. Create an event for this. */ GST_DEBUG_OBJECT (jitterbuffer, "Packet #%d lost", next_seqnum); priv->num_late++; discont = TRUE; if (priv->do_lost) { /* create paket lost event */ event = gst_event_new_custom (GST_EVENT_CUSTOM_DOWNSTREAM, gst_structure_new ("GstRTPPacketLost", "seqnum", G_TYPE_UINT, (guint) next_seqnum, "timestamp", G_TYPE_UINT64, out_time, "duration", G_TYPE_UINT64, duration, NULL)); gst_pad_push_event (priv->srcpad, event); } /* update our expected next packet */ priv->last_popped_seqnum = next_seqnum; priv->last_out_time = out_time; priv->next_seqnum = (next_seqnum + 1) & 0xffff; /* look for next packet */ goto again; } /* there was no known gap,just the first packet, exit the loop and push */ GST_DEBUG_OBJECT (jitterbuffer, "First packet #%d synced", seqnum); /* get new timestamp, latency might have changed */ out_time = apply_offset (jitterbuffer, timestamp); } push_buffer: /* when we get here we are ready to pop and push the buffer */ outbuf = rtp_jitter_buffer_pop (priv->jbuf); if (G_UNLIKELY (discont || priv->discont)) { /* set DISCONT flag when we missed a packet. We pushed the buffer writable * into the jitterbuffer so we can modify now. */ GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DISCONT); priv->discont = FALSE; } /* apply timestamp with offset to buffer now */ GST_BUFFER_TIMESTAMP (outbuf) = out_time; /* now we are ready to push the buffer. Save the seqnum and release the lock * so the other end can push stuff in the queue again. */ priv->last_popped_seqnum = seqnum; priv->last_out_time = out_time; priv->next_seqnum = (seqnum + 1) & 0xffff; JBUF_UNLOCK (priv); /* push buffer */ GST_DEBUG_OBJECT (jitterbuffer, "Pushing buffer %d, timestamp %" GST_TIME_FORMAT, seqnum, GST_TIME_ARGS (out_time)); result = gst_pad_push (priv->srcpad, outbuf); if (G_UNLIKELY (result != GST_FLOW_OK)) goto pause; return; /* ERRORS */ do_eos: { /* store result, we are flushing now */ GST_DEBUG_OBJECT (jitterbuffer, "We are EOS, pushing EOS downstream"); priv->srcresult = GST_FLOW_UNEXPECTED; gst_pad_pause_task (priv->srcpad); gst_pad_push_event (priv->srcpad, gst_event_new_eos ()); JBUF_UNLOCK (priv); return; } flushing: { GST_DEBUG_OBJECT (jitterbuffer, "we are flushing"); gst_pad_pause_task (priv->srcpad); JBUF_UNLOCK (priv); return; } pause: { const gchar *reason = gst_flow_get_name (result); GST_DEBUG_OBJECT (jitterbuffer, "pausing task, reason %s", reason); JBUF_LOCK (priv); /* store result */ priv->srcresult = result; /* we don't post errors or anything because upstream will do that for us * when we pass the return value upstream. */ gst_pad_pause_task (priv->srcpad); JBUF_UNLOCK (priv); return; } } static gboolean gst_rtp_jitter_buffer_query (GstPad * pad, GstQuery * query) { GstRtpJitterBuffer *jitterbuffer; GstRtpJitterBufferPrivate *priv; gboolean res = FALSE; jitterbuffer = GST_RTP_JITTER_BUFFER (gst_pad_get_parent (pad)); priv = jitterbuffer->priv; switch (GST_QUERY_TYPE (query)) { case GST_QUERY_LATENCY: { /* We need to send the query upstream and add the returned latency to our * own */ GstClockTime min_latency, max_latency; gboolean us_live; GstClockTime our_latency; if ((res = gst_pad_peer_query (priv->sinkpad, query))) { gst_query_parse_latency (query, &us_live, &min_latency, &max_latency); GST_DEBUG_OBJECT (jitterbuffer, "Peer latency: min %" GST_TIME_FORMAT " max %" GST_TIME_FORMAT, GST_TIME_ARGS (min_latency), GST_TIME_ARGS (max_latency)); /* store this so that we can safely sync on the peer buffers. */ JBUF_LOCK (priv); priv->peer_latency = min_latency; our_latency = ((guint64) priv->latency_ms) * GST_MSECOND; JBUF_UNLOCK (priv); GST_DEBUG_OBJECT (jitterbuffer, "Our latency: %" GST_TIME_FORMAT, GST_TIME_ARGS (our_latency)); /* we add some latency but can buffer an infinite amount of time */ min_latency += our_latency; max_latency = -1; GST_DEBUG_OBJECT (jitterbuffer, "Calculated total latency : min %" GST_TIME_FORMAT " max %" GST_TIME_FORMAT, GST_TIME_ARGS (min_latency), GST_TIME_ARGS (max_latency)); gst_query_set_latency (query, TRUE, min_latency, max_latency); } break; } default: res = gst_pad_query_default (pad, query); break; } gst_object_unref (jitterbuffer); return res; } static void gst_rtp_jitter_buffer_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstRtpJitterBuffer *jitterbuffer; GstRtpJitterBufferPrivate *priv; jitterbuffer = GST_RTP_JITTER_BUFFER (object); priv = jitterbuffer->priv; switch (prop_id) { case PROP_LATENCY: { guint new_latency, old_latency; new_latency = g_value_get_uint (value); JBUF_LOCK (priv); old_latency = priv->latency_ms; priv->latency_ms = new_latency; JBUF_UNLOCK (priv); /* post message if latency changed, this will inform the parent pipeline * that a latency reconfiguration is possible/needed. */ if (new_latency != old_latency) { GST_DEBUG_OBJECT (jitterbuffer, "latency changed to: %" GST_TIME_FORMAT, GST_TIME_ARGS (new_latency * GST_MSECOND)); gst_element_post_message (GST_ELEMENT_CAST (jitterbuffer), gst_message_new_latency (GST_OBJECT_CAST (jitterbuffer))); } break; } case PROP_DROP_ON_LATENCY: JBUF_LOCK (priv); priv->drop_on_latency = g_value_get_boolean (value); JBUF_UNLOCK (priv); break; case PROP_TS_OFFSET: JBUF_LOCK (priv); priv->ts_offset = g_value_get_int64 (value); /* FIXME, we don't really have a method for signaling a timestamp * DISCONT without also making this a data discont. */ /* priv->discont = TRUE; */ JBUF_UNLOCK (priv); break; case PROP_DO_LOST: JBUF_LOCK (priv); priv->do_lost = g_value_get_boolean (value); JBUF_UNLOCK (priv); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_rtp_jitter_buffer_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstRtpJitterBuffer *jitterbuffer; GstRtpJitterBufferPrivate *priv; jitterbuffer = GST_RTP_JITTER_BUFFER (object); priv = jitterbuffer->priv; switch (prop_id) { case PROP_LATENCY: JBUF_LOCK (priv); g_value_set_uint (value, priv->latency_ms); JBUF_UNLOCK (priv); break; case PROP_DROP_ON_LATENCY: JBUF_LOCK (priv); g_value_set_boolean (value, priv->drop_on_latency); JBUF_UNLOCK (priv); break; case PROP_TS_OFFSET: JBUF_LOCK (priv); g_value_set_int64 (value, priv->ts_offset); JBUF_UNLOCK (priv); break; case PROP_DO_LOST: JBUF_LOCK (priv); g_value_set_boolean (value, priv->do_lost); JBUF_UNLOCK (priv); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } void gst_rtp_jitter_buffer_get_sync (GstRtpJitterBuffer * buffer, guint64 * rtptime, guint64 * timestamp) { GstRtpJitterBufferPrivate *priv; g_return_if_fail (GST_IS_RTP_JITTER_BUFFER (buffer)); priv = buffer->priv; JBUF_LOCK (priv); rtp_jitter_buffer_get_sync (priv->jbuf, rtptime, timestamp); JBUF_UNLOCK (priv); }