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rtpjitterbuffer: fix race when updating the next_seqnum

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If we were not waiting for the missing seqnum when we insert the lost packet
event in the jitterbuffer, we end up not updating the next_seqnum and wait
forever for the lost packets to arrive. Instead, keep track of the amount of
packets contained by the jitterbuffer item and update the next expected
seqnum only after pushing the buffer/event. This makes sure we correctly handle
GAPS in the sequence numbers.
This commit is contained in:
Wim Taymans 2013-09-30 12:31:00 +02:00
parent fde438791e
commit 00056965e8
2 changed files with 8 additions and 15 deletions
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21
gst/rtpmanager/gstrtpjitterbuffer.c
View file

@ -716,7 +716,7 @@ gst_rtp_jitter_buffer_init (GstRtpJitterBuffer * jitterbuffer)
static RTPJitterBufferItem *
alloc_item (gpointer data, guint type, GstClockTime dts, GstClockTime pts,
guint seqnum, guint rtptime)
guint seqnum, guint count, guint rtptime)
{
RTPJitterBufferItem *item;
@ -728,6 +728,7 @@ alloc_item (gpointer data, guint type, GstClockTime dts, GstClockTime pts,
item->dts = dts;
item->pts = pts;
item->seqnum = seqnum;
item->count = count;
item->rtptime = rtptime;
return item;
@ -2085,7 +2086,7 @@ gst_rtp_jitter_buffer_chain (GstPad * pad, GstObject * parent,
}
}
item = alloc_item (buffer, ITEM_TYPE_BUFFER, dts, pts, seqnum, rtptime);
item = alloc_item (buffer, ITEM_TYPE_BUFFER, dts, pts, seqnum, 1, rtptime);
/* 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
@ -2306,7 +2307,7 @@ pop_and_push_next (GstRtpJitterBuffer * jitterbuffer, guint16 seqnum)
/* 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->next_seqnum = (seqnum + 1) & 0xffff;
priv->next_seqnum = (seqnum + item->count) & 0xffff;
JBUF_UNLOCK (priv);
item->data = NULL;
@ -2483,7 +2484,7 @@ do_lost_timeout (GstRtpJitterBuffer * jitterbuffer, TimerData * timer,
{
GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
GstClockTime duration, timestamp;
guint seqnum, next_seqnum, lost_packets, num_rtx_retry;
guint seqnum, lost_packets, num_rtx_retry;
gboolean late;
GstEvent *event;
RTPJitterBufferItem *item;
@ -2507,8 +2508,6 @@ do_lost_timeout (GstRtpJitterBuffer * jitterbuffer, TimerData * timer,
priv->num_late += lost_packets;
priv->num_rtx_failed += num_rtx_retry;
next_seqnum = seqnum + lost_packets - 1;
/* create paket lost event */
event = gst_event_new_custom (GST_EVENT_CUSTOM_DOWNSTREAM,
gst_structure_new ("GstRTPPacketLost",
@ -2518,17 +2517,9 @@ do_lost_timeout (GstRtpJitterBuffer * jitterbuffer, TimerData * timer,
"late", G_TYPE_BOOLEAN, late,
"retry", G_TYPE_UINT, num_rtx_retry, NULL));
item = alloc_item (event, ITEM_TYPE_LOST, -1, -1, next_seqnum, -1);
item = alloc_item (event, ITEM_TYPE_LOST, -1, -1, seqnum, lost_packets, -1);
rtp_jitter_buffer_insert (priv->jbuf, item, NULL, NULL);
if (seqnum == priv->next_seqnum) {
GST_DEBUG_OBJECT (jitterbuffer, "lost seqnum %d == %d next_seqnum -> %d",
seqnum, priv->next_seqnum, next_seqnum);
priv->next_seqnum = next_seqnum & 0xffff;
priv->last_popped_seqnum = next_seqnum;
priv->last_out_time = timestamp;
}
/* remove timer now */
remove_timer (jitterbuffer, timer);
JBUF_SIGNAL_EVENT (priv);

2
gst/rtpmanager/rtpjitterbuffer.h
View file

@ -109,6 +109,7 @@ struct _RTPJitterBufferClass {
* @dts: input DTS
* @pts: output PTS
* @seqnum: seqnum
* @count: amount of seqnum in this item
* @rtptime: rtp timestamp
*
* An object containing an RTP packet or event.
@ -121,6 +122,7 @@ struct _RTPJitterBufferItem {
GstClockTime dts;
GstClockTime pts;
guint seqnum;
guint count;
guint rtptime;
};