[non-BE] Fix #26 MDCT-Stereo kernel swithcing crashing the decoder with PLC and rate switching
requested to merge 26-mdct-stereo-kernel-switching-can-crash-the-decoder-in-combination-with-plc-and-rate-switching into main
Addresses #26 (closed) by forcing MDCT-IV kernel for TRANSITION frames in the decoder always.
This is in general not bitexact, but the only very rare case where BE changes is when there is a TRANSITION frame in the decoder which is of another type in the encoder (can happen due to PLC and/or rate switching only). There is no such test in the current selftest, though.
Edited by Jan Kiene