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nvdecoder: Various fixes for 4:4:4 and high-bitdepth decoding

Seungha Yang requested to merge seungha.yang/gstreamer:nvdec-fix into main 
    nvh265sldec: Fix for decoding 12bits stream

    We've been exposing main-444-12 profile as a supported profile
    in its sinkpad template but not actaully. Adding code to
    covert 12 and 16 bits as well.
    nvdecoder: Fix for HEVC 4:4:4 format decoding

    Map chroma_format_idc == 3 (which means 4:4:4 subsampling) correctly,
    also pass coded bitdepth for decoder initialization instead of
    inferring it from output format since they can be different.

    Fixes: https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/949

Fixes: #949 (closed)

Edited by Seungha Yang

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