Waveform discrepency when transitioning from concealing a lost frame to decoding a received frame with SBA bitstream

Fixed decoder sha: 77241999

Float decoder sha: d9fdb374

Encoder: d9fdb374

Renderer: d9fdb374

Test condition: -16/-26LKFS, HOA3, 24.4/32kbps, 15% FER

Supporting files: Box\_EXTERNAL_IVAS_BASOP_VERIFICATION\issues\issue-971

Command line:

./IVAS_dec -no_delay_cmp HOA3 48 bit_HOA3 dec.wav
./IVAS_rend -i dec.wav -if HOA3 -o out.wav -of BINAURAL

Observations:

In transitioning from concealing a lost frame to decoding the first few received ones after the loss, a large deviation of the fixed-point output from the floating point one is observed. The two waveform converged after a few frames. I suspect there is some xfade going wrong in there.