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Fix for Issue 667 added under FIX_667_DISABLE_INITIAL_PLC_SUPPRESSION

norvellrequested to merge
667-bit-exactness-failure-observed-with-one-file-in-evs-stv16n2_96_1280_16khz-epf-out into main

Closes #667 (closed)

This disables the functionality of IVAS float to suppress the output of initial lost frames in EVS operation. In IVAS operation, the output cannot be generated since the number of output channels is not known before the first frame has been decoded. In EVS operation it is always one channel, so the output can be generated before a frame has been decoded.

However, the output that is generated before any frame is decoded is not really valid, so this is something we could consider to fix in the EVS and rather align it to the IVAS decoder behavior.

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