Draft: Review potentially duplicated IGF functions 2

Michael Sturmrequested to merge
basop-2346-review-potentially-duplicated-igf-functions-2 into main

Reason why this change is needed

  • There are still a few duplicate IGF functions for EVS and IVAS. This adds lots of code redundancy and makes it hard to understand and maintain the code.

Description of the change

  • The functions IGF_CalculateEnvelope() and IGF_CalculateEnvelope_ivas_fx() are unified to IGF_CalculateEnvelope().

Affected operating points

  • Produced bitstream is BE for EVS-MONO and IVAS compared to previous state

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