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decklinkaudiosrc: Extrapolate stream/hw reference timestamps when video frame is missing

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Sometimes we might get an audio packet without a corresponding video
frame. In these cases, the stream and hardware reference timestamps
would be missing, because they're called on the video frame. Instead of
potentially breaking stuff downstream that might depend on these, we now
extrapolate them.

https://bugzilla.gnome.org/show_bug.cgi?id=792042
This commit is contained in:
Vivia Nikolaidou 2017-12-29 15:14:54 +02:00
parent a3a7d2e0ff
commit b5ff71fc3c
2 changed files with 25 additions and 2 deletions
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26
sys/decklink/gstdecklinkaudiosrc.cpp
View file

@ -707,6 +707,27 @@ retry:
// Detect gaps in stream time
self->processed += sample_count;
if (self->expected_stream_time != GST_CLOCK_TIME_NONE
&& p.stream_timestamp == GST_CLOCK_TIME_NONE) {
/* We missed a frame. Extrapolate the timestamps */
p.stream_timestamp = self->expected_stream_time;
p.stream_duration =
gst_util_uint64_scale_int (sample_count, GST_SECOND, self->info.rate);
}
if (self->last_hardware_time != GST_CLOCK_TIME_NONE
&& p.hardware_timestamp == GST_CLOCK_TIME_NONE) {
/* This should always happen when the previous one also does, but let's
* have two separate checks just in case */
GstClockTime start_hw_offset, end_hw_offset;
start_hw_offset =
gst_util_uint64_scale (self->last_hardware_time, self->info.rate,
GST_SECOND);
end_hw_offset = start_hw_offset + sample_count;
p.hardware_timestamp =
gst_util_uint64_scale_int (end_hw_offset, GST_SECOND, self->info.rate);
/* Will be the same as the stream duration - reuse it */
p.hardware_duration = p.stream_duration;
}
if (p.stream_timestamp != GST_CLOCK_TIME_NONE) {
GstClockTime start_stream_time, end_stream_time;
@ -738,14 +759,15 @@ retry:
GST_FORMAT_TIME, timestamp);
msg =
gst_message_new_qos (GST_OBJECT (self), TRUE, running_time, p.stream_timestamp,
timestamp, duration);
gst_message_new_qos (GST_OBJECT (self), TRUE, running_time,
p.stream_timestamp, timestamp, duration);
gst_message_set_qos_stats (msg, GST_FORMAT_DEFAULT, self->processed,
self->dropped);
gst_element_post_message (GST_ELEMENT (self), msg);
}
self->expected_stream_time = end_stream_time;
}
self->last_hardware_time = p.hardware_timestamp;
if (p.no_signal)
GST_BUFFER_FLAG_SET (*buffer, GST_BUFFER_FLAG_GAP);

1
sys/decklink/gstdecklinkaudiosrc.h
View file

@ -75,6 +75,7 @@ struct _GstDecklinkAudioSrc
GstClockTime expected_stream_time;
guint64 processed;
guint64 dropped;
GstClockTime last_hardware_time;
/* Last time we noticed a discont */
GstClockTime discont_time;