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Psychotoxical
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When loudness normalization is on, every PARTIAL_LOUDNESS_EMIT_INTERVAL_MS
(900 ms per active stream task) the backend emits analysis:loudness-partial.
The frontend listener wrote cachedLoudnessGainByTrackId and unconditionally
called updateReplayGainForCurrentTrack, which invoked audio_update_replay_gain,
which in turn emitted audio:normalization-state back to the renderer — closing
a loop the UI had to drain on every tick. WebKitGTK absorbed it; WebView2 did
not, and after a few minutes the renderer thread stalled while Rust analysis
tasks kept progressing (visible in logs).
Five gates close the loop, smallest first:
Frontend (src/store/playerStore.ts):
- analysis:loudness-partial listener now short-circuits when the new gainDb is
within 0.05 dB of the cached value.
- audio_update_replay_gain calls go through invokeAudioUpdateReplayGainDeduped
(250 ms key-based dedupe), mirroring the audio_set_normalization helper from
#320.
- refreshLoudnessForTrack now coalesces concurrent calls per (trackId, mode)
via loudnessRefreshInflight, mirroring waveformRefreshInflight.
Backend (src-tauri/src/audio.rs):
- audio:normalization-state emits go through maybe_emit_normalization_state,
which keeps the last-emitted payload behind a Mutex and skips when engine
matches and current_gain_db (±0.05 dB) / target_lufs (±0.02) are unchanged.
Applied at all three emit sites: audio_play, audio_update_replay_gain,
audio_set_normalization.
- analysis:loudness-partial emits are gated by partial_loudness_should_emit:
per-track-identity last-emitted-gain map; an emit is suppressed when the new
gain is within PARTIAL_LOUDNESS_DELTA_THRESHOLD_DB (0.1 dB) of the previous
one. Applied to both emit_partial_loudness_from_bytes (legacy path) and the
inline ranged_download_task progress emit.
Drive-by: split estimated_output_latency_secs into two #[cfg]-gated
definitions so the sample_rate_hz parameter is no longer flagged as unused on
Windows / macOS builds. Function originally added in c6fc3ec.
Net effect: when loudness is steady (the common case), zero IPC traffic on
this path. UI stays responsive on Windows. Tested on Windows + Linux.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>