feat(audio): visualizer sample tap on the audio engine - #19
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Mirror every output buffer (post-volume; zeros while paused/stopped) into a lock-free ring in SharedState, written from the audio callback with relaxed atomic stores only - no locks or allocation on the real-time thread. PlayerService::visualizer_samples(n) returns the most recent interleaved samples plus the stream channel count so front-ends can render meters or spectra. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Summary
Adds a real-time-safe visualizer tap so front-ends can render meters or spectra from what is actually playing:
SharedState— relaxed atomic stores only, no locks or allocation on the real-time thread.PlayerService::visualizer_samples(n)returns up tonof the most recent interleaved samples (newest last) plus the stream channel count. Empty when the engine is not initialized.First consumer: the VU meters overlay in tornade-tui (PR to follow, depends on this).
Test plan
🤖 Generated with Claude Code