Daniel Almeida ad70e0d5e8 codecalpha: alphacombine: add support for NV12/AV12 ...

Alpha combine works by appending the GstMemory for the alpha channel
to the GstBuffer containing I420, thereby pushing A420 on its src pad.

Add support for the same workflow for NV12, thereby producing the
recently introduced AV12 format (NV12 + Alpha).

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/2277>

2021-05-27 11:03:41 -04:00

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