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decklinkvideosrc: Add the diff between the pipeline base time and when we start to play

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Add the diff between the external time when we went to playing and
the external time when the pipeline went to playing. Otherwise we
will always start outputting from 0 instead of the current running
time.
This commit is contained in:
Sebastian Dröge 2015-02-10 15:30:44 +01:00
parent d4575e759b
commit f83ac624e3
1 changed files with 12 additions and 0 deletions
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12
sys/decklink/gstdecklinkvideosrc.cpp
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@ -381,11 +381,23 @@ gst_decklink_video_src_convert_to_external_clock (GstDecklinkVideoSrc * self,
if (rate_n != rate_d && self->internal_base_time != GST_CLOCK_TIME_NONE) {
GstClockTime internal_timestamp = *timestamp;
GstClockTimeDiff external_start_time_diff;
// Convert to the running time corresponding to both clock times
internal -= self->internal_base_time;
external -= self->external_base_time;
// Add the diff between the external time when we
// went to playing and the external time when the
// pipeline went to playing. Otherwise we will
// always start outputting from 0 instead of the
// current running time.
external_start_time_diff =
gst_element_get_base_time (GST_ELEMENT_CAST (self));
external_start_time_diff =
self->external_base_time - external_start_time_diff;
external += external_start_time_diff;
// Get the difference in the internal time, note
// that the capture time is internal time.
// Then scale this difference and offset it to