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        if(turbo == 1)        {            param.i_frame_reference = ( param.i_frame_reference + 1 ) >> 1;            param.analyse.i_subpel_refine = FFMAX( FFMIN( 3, param.analyse.i_subpel_refine - 1 ), 1 );            param.analyse.inter &= ( ~X264_ANALYSE_PSUB8x8 );            param.analyse.inter &= ( ~X264_ANALYSE_BSUB16x16 );            param.analyse.i_trellis = 0;        }        else if(turbo >= 2)        {            param.i_frame_reference = 1;            param.analyse.i_subpel_refine = 1;            param.analyse.i_me_method = X264_ME_DIA;            param.analyse.inter = 0;            param.analyse.b_transform_8x8 = 0;            param.analyse.b_weighted_bipred = 0;            param.analyse.i_trellis = 0;        }