nvh265sldec: Add support for delayed output
Delay 4 frames in case of non-live to improve throughput
h265decoder: Add support for delayed output
Functionally identical to the other decoder baseclasses.
Delayed output can improve throughput depending on decoding APIs.
h265decoder: Update documentation
Sync up with other baseclasses
h265decoder: Drain decoder on new_sequence()
Holding previously decoded but not outputted pictures even after
new_sequence is not a safe approach in various aspect.
However, we cannot drain out DPB on new_sequence() unconditionally,
because there is a case where decoder should drop decoded pictures
if NoOutputOfPriorPicsFlag is set.
To detect NoOutputOfPriorPicsFlag before the new_sequence() call,
this patch splits decoding process into two path, one for nal unit parsing
in order to detect NoOutputOfPriorPicsFlag and then each nal unit
will be decoded.
h265decoder: Remove unused pts variable
We can know timestamp from associated GstVideoCodecFrame