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[MOVED FROM GST-P-FARSIGHT] liveadder : Handle jitter in incoming buffers

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Incoming buffers (especially those from an RTP connection) might have slight timestamp jitter. This is normally handled by audiosink (accepting up to 500ms of jitter).
Here we accept a maximum jitter of 10ms. If a buffer is within 10ms of the expected time, we correct its timestamp.
This commit is contained in:
Edward Hervey 2008-08-27 17:16:27 +02:00
parent 28d1fc48a6
commit 8a533c4282
1 changed files with 27 additions and 5 deletions
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32
gst/liveadder/liveadder.c
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@ -897,11 +897,16 @@ gst_live_live_adder_chain (GstPad *pad, GstBuffer *buffer)
GstFlowReturn ret = GST_FLOW_OK;
GList *item = NULL;
GstClockTime skip = 0;
gint64 drift = 0; /* Positive if new buffer after old buffer */
GST_OBJECT_LOCK (adder);
ret = adder->srcresult;
GST_DEBUG ("Incoming buffer time:%"GST_TIME_FORMAT" duration:%"GST_TIME_FORMAT,
GST_TIME_ARGS(GST_BUFFER_TIMESTAMP(buffer)),
GST_TIME_ARGS(GST_BUFFER_DURATION(buffer)));
if (ret != GST_FLOW_OK)
{
GST_DEBUG_OBJECT (adder, "Passing non-ok result from src: %s",
@ -942,17 +947,28 @@ gst_live_live_adder_chain (GstPad *pad, GstBuffer *buffer)
if (padprivate->segment.format != GST_FORMAT_TIME)
goto invalid_segment;
buffer = gst_buffer_make_metadata_writable (buffer);
drift = GST_BUFFER_TIMESTAMP (buffer) - padprivate->expected_timestamp;
/* Just see if we receive invalid timestamp/durations */
if (GST_CLOCK_TIME_IS_VALID (padprivate->expected_timestamp) &&
!GST_BUFFER_FLAG_IS_SET(buffer, GST_BUFFER_FLAG_DISCONT) &&
GST_BUFFER_TIMESTAMP(buffer) != padprivate->expected_timestamp)
(drift != 0)) {
GST_LOG_OBJECT (adder,
"Timestamp discontinuity without the DISCONT flag set"
" (expected %" GST_TIME_FORMAT ", got %" GST_TIME_FORMAT")",
" (expected %" GST_TIME_FORMAT ", got %" GST_TIME_FORMAT" drift:%ldms)",
GST_TIME_ARGS (padprivate->expected_timestamp),
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)));
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)),
drift / GST_MSECOND);
/* We accept drifts of 10ms*/
if (ABS(drift) < (10 * GST_MSECOND)) {
GST_DEBUG ("Correcting minor drift");
GST_BUFFER_TIMESTAMP (buffer) = padprivate->expected_timestamp;
}
}
buffer = gst_buffer_make_metadata_writable (buffer);
/* If there is no duration, lets set one */
if (!GST_BUFFER_DURATION_IS_VALID (buffer)) {
@ -976,8 +992,10 @@ gst_live_live_adder_chain (GstPad *pad, GstBuffer *buffer)
adder->bps);
/* buffer can be NULL if it's completely outside of the segment */
if (!buffer)
if (!buffer) {
GST_DEBUG ("Buffer completely outside of configured segment, dropping it");
goto out;
}
/*
* Make sure all incoming buffers share the same timestamping
@ -1297,6 +1315,10 @@ gst_live_adder_loop (gpointer data)
if (newseg_event)
gst_pad_push_event (adder->srcpad, newseg_event);
GST_DEBUG ("About to push buffer time:%"GST_TIME_FORMAT" duration:%"GST_TIME_FORMAT,
GST_TIME_ARGS(GST_BUFFER_TIMESTAMP(buffer)),
GST_TIME_ARGS(GST_BUFFER_DURATION(buffer)));
result = gst_pad_push (adder->srcpad, buffer);
if (result != GST_FLOW_OK)
goto pause;