Decoder: High MLD for Stereo at 24.4 kbps to Mono

Basic info

• Float reference:
  • Encoder (float): dd0cceed
• Fixed point:
  • Decoder (fixed): 6835cac6

Bug description

The fixed point decoder exhibits a high MLD of 44.4 compared to the float output.

The fixed point output is saturated and clipped:

Float decoder output ( -8.27 LUFS):

Fixed decoder output ( -4.78 LUFS):

This is possibly related to #1793.

Ways to reproduce

Box folder: ...\Box_EXTERNAL_IVAS_BASOP_VERIFICATION\issues\issue-1947

sox -D am1aa1s12_48.wav am1aa1s12_48.10dB.wav gain 10
./IVAS_cod_flt_ref -stereo -max_band FB 24400 48 am1aa1s12_48.10dB.wav bit
./IVAS_dec_flt_ref mono 32 bit ref.wav
./IVAS_dec_fx mono 32 bit cut.wav