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Fix for issue 939: Decoder crash for Stereo EVS Downmix with FER and...

Sandesh Venkateshrequested to merge
3gpp_issue_939_fix into main

Fix for issue 939: Decoder crash for Stereo EVS Downmix with FER and rateswitching in E_LPC_f_isp_a_conversion()

The decoder crash for the issue 939 stream is happening inside the function E_LPC_f_isp_a_conversion within the basop round_fx. Inside the basop, overflow is happening for the addition (L_add) resulting in a crash.

The function E_LPC_f_isp_a_conversion is taken from EVS implementation. This saturation would not affect EVS, but need a confirmation from module owner.

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