Returns an embed field value based on the parameters.

def process_embed_override(href_embed=None,
                           embed_items=None,
                           embed_tracks=None,
                           embed_metadata=None,
                           embed_insights=None):
    """Returns an embed field value based on the parameters."""
    # Our defaults are None, which are the API defaults.
    final_items = None
    final_tracks = None
    final_metadata = None
    final_insights = None

    # First, figure out what was embedded in the original href.
    # If any of the embeds are there, flip the final to True
    if href_embed:
        if 'items' in href_embed:
            final_items = True
        if 'tracks' in href_embed:
            final_tracks = True
        if 'metadata' in href_embed:
            final_metadata = True
        if 'insights' in href_embed:
            final_insights = True

    # Second, override the what we have.
    # None >> Do nothing
    # True >> Set to True
    # False >> Set to None
    if embed_items is not None:
        if embed_items is True:
            final_items = True
        else:
            final_items = None
    if embed_tracks is not None:
        if embed_tracks is True:
            final_tracks = True
        else:
            final_tracks = None
    if embed_metadata is not None:
        if embed_metadata is True:
            final_metadata = True
        else:
            final_metadata = None
    if embed_insights is not None:
        if embed_insights is True:
            final_insights = True
        else:
            final_insights = None

    return process_embed(embed_items=final_items,
                         embed_tracks=final_tracks,
                         embed_metadata=final_metadata,
                         embed_insights=final_insights)