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[rend-non-be][non-BE] Resolve "enable rendering of mono/stereo to all formats in extrend + fix decoder JBM upmix + add decoder tests"

Archit Tamarapurequested to merge
float-1466-mono-stereo-upmix-fixes-rend-dec-tests into main
  • Related issues: #1466
  • Requested reviewers:

Reason why this change is needed

  • #1419 (closed) added decoder support, this adds support in the external renderer

Description of the change

  • Enable rendering of mono/stereo to all output formats, following the same logic as the decoder (no spatial upmix)
  • Fix for decoder JBM mono/stereo upmix to HOA3 (crash due to wrong number of transport channels uncovered by new tests below)
  • Add tests for codec and renderer -> see !2442 (merged) for renderer tests

Affected operating points

  • External renderer, mono and stereo input to other outputs
    • nonBE for mono/stereo to ambisonics (X component is no longer present, see also here)
  • Decoder JBM mode mono/stereo upmix to HOA3
  • Tests/CI: codec smoke test

Closes #1466

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