fix(spectrogram): Fix spectrogram gain calculation

[jeffpyke]

Short description

Resolves two issues with spectrograms:

• The gain calculation did not seem to be correct.
• A gain of 0 was erroneously replaced by 20

Implementation details

How to test it

Screenshots

Example of gain issue:

Fixed:

Checklist

• This PR is covered by e2e tests
• It introduces no breaking API changes

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src/plugins/spectrogram.ts

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Walkthrough

The changes in the spectrogram.ts file focus on refining the SpectrogramPlugin class's implementation. The modifications primarily involve updating the handling of gainDB and rangeDB properties using the nullish coalescing operator, adjusting frequency calculation logic, and improving the constructor's initialization of default values. These updates aim to provide more precise control over spectrogram visualization and data processing.

Changes

File	Change Summary
src/plugins/spectrogram.ts	- Updated gainDB and rangeDB property handling with nullish coalescing operator - Modified getFrequencies method calculation threshold - Refined constructor initialization for fftSamples, noverlap, and windowFunc - Adjusted height property logic

Poem

🎵 In spectrogram's digital dance,
A rabbit's code takes a clever stance
Nullish coalescing, frequencies bright
Pixels and waves now align just right
Hop, hop, through audio's domain! 🐰🎨

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📥 Commits

Reviewing files that changed from the base of the PR and between 8368928 and 4aa64a7.

📒 Files selected for processing (1)

• src/plugins/spectrogram.ts (2 hunks)

🔇 Additional comments (1)

src/plugins/spectrogram.ts (1)

348-349: LGTM! This fixes the gain calculation issue.

The change from logical OR to nullish coalescing operator is correct. This allows gainDB to be set to 0, preventing the unintended behavior where a gain value of 0 was being replaced with 20.

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[katspaugh]

Thank you!