Wait until at least one keyframe has been parsed before
deciding to switch to passthrough mode, in case the
stream contains SEI messages that supplement the output
caps - for example by providing stereoscopic information
Improve parser state tracking by introducing new flags reflecting
it: "got-sps", "got-pps" and "got-slice". This is an addition for
robustness purposes.
Older have_sps and have_pps variables are kept because they have
a different meaning. i.e. they are used for deciding on when to
submit updated caps or not, and rather mean "have new SPS/PPS to
be submitted?"
Signed-off-by: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
As we can now rely upon being passed upstream delineated data in
::handle_frame(), the latter can also parse avc formatted data
without having to intercept baseparse's chain function.
While this evidently requires 2 separate parsing paths, each can
be streamlined accordingly.
... as baseparse then provides whole chunks of data (as it should) at once
to be parsed, and so the assumptions used to optimize are no longer valid.
Fixes#667560.
Functionally equivalent to (legacy)h264parse and re-uses the latter's low
level NAL parsing, but otherwise based on GstBaseParse, and replacing
some property configuration with caps negotiation.
