The function `ivas_core_enc_fx()` differs from its FLP counterpart `ivas_core_enc()`. Although recent MRs have already brought these two functions closer together, significant differences still exist. The following changes are thus proposed to simplify `ivas_core_enc_fx()` and bring its structure as close as possible to its FLP counterpart `ivas_core_enc()`: * do scalings of buffers related to one particular module in this module, instead of in the high-level function `ivas_core_enc_fx()` * introduce a new function related to the scaling of buffers, which replaces the same code blocks repeatedly used in the current function `ivas_core_enc_fx()` * remove dead code related to instances like ``` IF( EQ_16( sts[0]->element_mode, IVAS_CPE_MDCT ) ) { ... IF( NE_16( st->element_mode, IVAS_CPE_MDCT ) ) { ... dead code here ... } ... } ``` <!--- Below are labels that will be added but are not shown in description. This is a template to help fill them. Add further information to the first row and remove and add labels as necessary.-->