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jitterbuffer: make sure time does not go backwards

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When we construct a timestamp that would result in a timestamp that is earlier
than when the packet was received, reset the skew calculation as this is
probably a sign that the sender restarted or paused.

Fixes #593354
This commit is contained in:
Wim Taymans 2009-09-01 12:41:36 +02:00
parent bfb1260af4
commit 8d924611e7
3 changed files with 36 additions and 22 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
gst/rtpmanager/gstrtpjitterbuffer.c
View file

@ -1211,7 +1211,7 @@ gst_rtp_jitter_buffer_chain (GstPad * pad, GstBuffer * buffer)
* 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)))
priv->clock_rate, (priv->latency_ms * GST_MSECOND), &tail)))
goto duplicate;
/* signal addition of new buffer when the _loop is waiting. */

22
gst/rtpmanager/rtpjitterbuffer.c
View file

@ -195,7 +195,7 @@ rtp_jitter_buffer_resync (RTPJitterBuffer * jbuf, GstClockTime time,
*/
static GstClockTime
calculate_skew (RTPJitterBuffer * jbuf, guint32 rtptime, GstClockTime time,
guint32 clock_rate)
guint32 clock_rate, GstClockTime max_delay)
{
guint64 ext_rtptime;
guint64 send_diff, recv_diff;
@ -278,7 +278,7 @@ calculate_skew (RTPJitterBuffer * jbuf, guint32 rtptime, GstClockTime time,
* changed too quickly we have to resync because the server likely restarted
* its timestamps. */
if (ABS (delta - jbuf->skew) > GST_SECOND) {
GST_WARNING ("delta %" GST_TIME_FORMAT " too big, reset skew",
GST_WARNING ("delta - skew: %" GST_TIME_FORMAT " too big, reset skew",
GST_TIME_ARGS (delta - jbuf->skew));
rtp_jitter_buffer_resync (jbuf, time, gstrtptime, ext_rtptime, TRUE);
send_diff = 0;
@ -386,6 +386,18 @@ no_skew:
out_time = jbuf->prev_out_time;
}
}
if (out_time + max_delay < time) {
/* if we are going to produce a timestamp that is later than the input
* timestamp, we need to reset the jitterbuffer. Likely the server paused
* temporarily */
GST_DEBUG ("out %" GST_TIME_FORMAT " + %" G_GUINT64_FORMAT " < time %"
GST_TIME_FORMAT ", reset jitterbuffer", GST_TIME_ARGS (out_time),
max_delay, GST_TIME_ARGS (time));
rtp_jitter_buffer_resync (jbuf, time, gstrtptime, ext_rtptime, TRUE);
out_time = time;
send_diff = 0;
}
} else
out_time = -1;
@ -404,6 +416,7 @@ no_skew:
* @buf: a buffer
* @time: a running_time when this buffer was received in nanoseconds
* @clock_rate: the clock-rate of the payload of @buf
* @max_delay: the maximum lateness of @buf
* @tail: TRUE when the tail element changed.
*
* Inserts @buf into the packet queue of @jbuf. The sequence number of the
@ -415,7 +428,8 @@ no_skew:
*/
gboolean
rtp_jitter_buffer_insert (RTPJitterBuffer * jbuf, GstBuffer * buf,
GstClockTime time, guint32 clock_rate, gboolean * tail)
GstClockTime time, guint32 clock_rate, GstClockTime max_delay,
gboolean * tail)
{
GList *list;
guint32 rtptime;
@ -449,7 +463,7 @@ rtp_jitter_buffer_insert (RTPJitterBuffer * jbuf, GstBuffer * buf,
* receive time, this function will retimestamp @buf with the skew corrected
* running time. */
rtptime = gst_rtp_buffer_get_timestamp (buf);
time = calculate_skew (jbuf, rtptime, time, clock_rate);
time = calculate_skew (jbuf, rtptime, time, clock_rate, max_delay);
GST_BUFFER_TIMESTAMP (buf) = time;
/* It's more likely that the packet was inserted in the front of the buffer */

2
gst/rtpmanager/rtpjitterbuffer.h
View file

@ -84,6 +84,7 @@ void rtp_jitter_buffer_reset_skew (RTPJitterBuffer *jbuf)
gboolean rtp_jitter_buffer_insert (RTPJitterBuffer *jbuf, GstBuffer *buf,
GstClockTime time,
guint32 clock_rate,
GstClockTime max_delay,
gboolean *tail);
GstBuffer * rtp_jitter_buffer_peek (RTPJitterBuffer *jbuf);
GstBuffer * rtp_jitter_buffer_pop (RTPJitterBuffer *jbuf);
@ -97,5 +98,4 @@ void rtp_jitter_buffer_get_sync (RTPJitterBuffer *jbuf,
guint64 *timestamp, guint32 *clock_rate,
guint64 *last_rtptime);
#endif /* __RTP_JITTER_BUFFER_H__ */