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android: Add SBC codec for UV-Pro audio - #110
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The BTECH UV-Pro carries its audio over Bluetooth as 32 kHz mono SBC, and Android has no public SBC codec. Add a mono 8-subband encoder and decoder, ported from HTCommander's Apache-2.0 SBC code (which follows libsbc), with unit tests. Not used yet. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This was referenced Oct 15, 2026
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Part 1 of 3 for #62 (BTECH UV-Pro support). Base: e4c39bd.
Claude Code (Claude Opus 5.5) wrote this under my direction. I didn't write it and haven't reviewed it line by line, but I went through every change with Claude, I can explain what each part does, and I did all the hardware testing myself.
What
The UV-Pro sends its Bluetooth audio as SBC. Android doesn't let apps use its own SBC codec, so this adds a mono-only encoder and decoder in one file, with unit tests. Nothing uses it until PR 3.
License
Ported from HTCommander's SBC code (Apache-2.0, © Ylian Saint-Hilaire). The original notice is kept in the file header. Happy to add a third-party notice file if you'd like one.
Test
./gradlew :app:testDebugUnitTest passes, with no new warnings.
I cross-checked it against ffmpeg's SBC in both directions: 63–66 dB SNR.
Used on air in PR 3.