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[non BE]: fix for issue 862 : UBSAN issue in SPAR decoder with BR switching and PLC

TYAGIRIS requested to merge 862-ubsan-out-of-bound-error-in-spar-for-osba-bitrate-switching-with-plc into main
  • Related issues:
  • Requested reviewers:

Reason why this change is needed

  • To fix the UBSAN issue in SPAR decoder with BR switching and PLC

Description of the change

  • Mapping of SPAR indices in time differential coding is only done if previous frame is not a bad frame.
  • Core coder's prev_bfi value is restored during bitrate switching

Affected operating points

  • Potentially all operating points that are using prev_bfi variable from core coder.
  • For bitstream compatibility, the following levels are helpful for describing encoder
    1. Produced bitstream is BE compared to previous state and backward compatible. Decoded output may be non-BE when both bitrate switching and PLC is being tested.

Related to #862 (closed)

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