Switch the webrtc-audio-processing dep from the 2.x git source (bundled
mode) back to crates.io 0.3, and link against Debian's apt package
libwebrtc-audio-processing-dev (0.3-1+b1 on Bookworm). The 2.x path
fails because both the crates.io tarball and the upstream git main
branch of webrtc-audio-processing-sys 2.0.3 have a build.rs bug where
\`meson setup --reconfigure\` is passed unconditionally, panicking on
first-run empty build dirs with "Directory does not contain a valid
build tree". The 0.x line sidesteps bundled mode entirely by linking
the apt-provided library.
Trade-off: we get AEC2 (the older generation) instead of AEC3, but
it's the same algorithm family and is what PulseAudio's
module-echo-cancel and PipeWire's filter-chain use on current
Debian-family distros. Fine for shipping — we can revisit AEC3 once
the 2.x bundled build is fixed upstream.
API changes:
- 0.3's Processor::process_capture_frame and process_render_frame
take &mut self, so wrap the module-level processor in a Mutex.
Capture and playback threads each lock briefly (sub-ms per 10 ms
frame); contention is minimal.
- Import NUM_SAMPLES_PER_FRAME from the crate directly instead of
hardcoding 480, so the code tracks whatever sample rate the
upstream C++ lib exposes (currently 48 kHz hardcoded -> 480).
- Helper fns drain_frames_through_apm / tee_render_samples / etc.
take &Mutex<Processor> instead of &Processor.
- Use explicit EchoCancellationSuppressionLevel and
NoiseSuppressionLevel imports rather than fully-qualified paths.
Dockerfile:
- Drop meson / ninja-build / python3 (only needed for bundled build).
- Add libwebrtc-audio-processing-dev for the system link path.
- Keep clang (may be needed by the bindgen step in some versions).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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