High audio distortion in external rendering OMASA to MASA

Basic info

• Float reference:
  • Renderer (float): f40fa467
• Fixed point:
  • Renderer (fixed): dae6401d / bef2d70c

Bug description

Using external renderer from OMASA to MASA2 output has (in addition to metadata issues already reported) severe distortions in the output transport audio signal.

This distortion is observed both in current main and MR !1743 (merged) fixing other distortions.

Example comparison of float vs basop outputs:

Ways to reproduce

Using LTV signals with the file ltv48_OMASA_4ISM_2TC.txt having the content:

ltv48_OMASA_4ISM_2TC.wav
5
ISM
1
ltv48_OMASA_4ISM_2TC_ISM1.csv
ISM
2
ltv48_OMASA_4ISM_2TC_ISM2.csv
ISM
3
ltv48_OMASA_4ISM_2TC_ISM3.csv
ISM
4
ltv48_OMASA_4ISM_2TC_ISM4.csv
MASA
5
2
ltv48_OMASA_4ISM_2TC.met

Commandline:

IVAS_rend -q -no_delay_cmp -if meta -i ltv48_OMASA_4ISM_2TC.txt -fs 48 -of MASA2 -o 0108_ltv48_OMASA_4ISM_2TC.wav_MASA2-no_delay_cmp.wav