[audio_core][test] Single-frequency fidelity tests

HermeticFidelityTest cases can now specify that only a single
frequency should be run.

Also, low_pass_frequency is converted to std::optional. At init time,
we can't automatically set an intelligent default (the Nyquist limit)
since we don't know the rates being used in the test. If we want to
warn the test author when they set it too high, then we must know
whether they explicitly set the value -- as opposed to it simply
being a too-high default value.

fx test audio-core-fidelity-test

Fixed: fxb/85960

Change-Id: I94fcbbb7f4c60eca8372e22b16cd319e34dc6db6
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/610192
Commit-Queue: Martin Puryear <mpuryear@google.com>
Reviewed-by: Tom Bergan <tombergan@google.com>
4 files changed
tree: 45a8192a9a255006c5af70a5c45c4b851e509c0e
  1. boards/
  2. build/
  3. bundles/
  4. docs/
  5. examples/
  6. garnet/
  7. products/
  8. scripts/
  9. sdk/
  10. src/
  11. third_party/
  12. tools/
  13. zircon/
  14. .clang-format
  15. .clang-tidy
  16. .git-blame-ignore-revs
  17. .gitattributes
  18. .gitignore
  19. .gn
  20. .style.yapf
  21. analysis_options.yaml
  22. AUTHORS
  23. BUILD.gn
  24. CODE_OF_CONDUCT.md
  25. CONTRIBUTING.md
  26. LICENSE
  27. OWNERS
  28. PATENTS
  29. README.md
  30. rustfmt.toml
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