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[Non-be]Large differences between BASOP and float after application of the upmix ACELP BWE in ivas_sba_dirac_stereo_dec()

Markus Wernerrequested to merge
2250-large-differences-between-basop-and-float-after-application-of-the-upmix-acelp-bwe-in into main

Reason why this change is needed

Large differences between BASOP and float after application of the upmix ACELP BWE in ivas_sba_dirac_stereo_dec().

Description of the change

Random vector generator in ACELP SWB TBE encoder/decoder now uses always the same j/k values for gaus_dico_swb lookup

Affected operating points

  1. Produced bitstream is BE for EVS-MONO compared to previous state
  2. Produced bitstream is non-BE for IVAS, but it is fully backwards compatible for decoding. Decoded output may differ.
Edited by Markus Werner

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