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d3d11h265dec: Add support for interlaced stream

Seungha Yang requested to merge seungha.yang/gst-plugins-bad:d3d11-h265-interlaced into master 
    d3d11h265dec: Add support for interlaced stream

    Note that we have no D3D11 deinterlace element yet.

    If downstream is not support format:Interlaced caps feature including all
    D3D11 the other elements, aspect-ratio will be adjusted as an
    alternative approach.
    codecs: h265decoder: Add support for interlaced stream

    * Invoke GstH265DecoderClass::new_sequence() method per interlaced
      stream status update so that subclass can update caps.
    * Parse picture timing SEI and set buffer flags on GstH265Picture
      object. Subclass can refer to it like that of our h264decoder
      implementation.
    * Remove pointless GstH265PictureField enum
    vah265dec: Don't need to pass picture structure to VA

    This code came from gstvaapidecoder_h265 implementation
    but picture structure is always GST_VAAPI_PICTURE_STRUCTURE_FRAME.
    Moreover, in theory, VA doesn't need to know picture structure for
    decoding HEVC stream.

    nvh265sldec: Remove pointless field picture parameter setup

    HEVC has no decoding flow for interlaced, field picture referencing.
Edited by Seungha Yang

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