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fix(relay): widen per-peer audio channel capacity 8->16 frames #4178

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fix(relay): widen per-peer audio channel capacity 8->16 frames #4178

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11 changes: 9 additions & 2 deletions crates/buzz-relay/src/audio/room.rs
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Expand Up @@ -36,8 +36,15 @@ pub enum PeerCtrl {
Close,
}

/// Audio channel capacity per peer: 8 frames = 160ms at 20ms/frame.
const AUDIO_CHANNEL_CAPACITY: usize = 8;
/// Audio channel capacity per peer: 16 frames = 320ms at 20ms/frame.
///
/// Widened from 8 (160ms) after measuring jitter spikes of 150-152ms on an
/// ordinary residential-ISP path to the relay — right at the old ceiling, so
/// brief jitter was enough to make `try_send` drop frames outright (heard as
/// audio grain, not lag). This raises the drop threshold; it does not change
/// per-peer memory bounds materially (still a handful of Opus frames, each
/// well under 1 KB).
const AUDIO_CHANNEL_CAPACITY: usize = 16;
/// Control channel capacity per peer: 32 slots — must never drop joined/left
/// messages, which are state-bearing (they maintain the client's peer_index →
/// pubkey map). Sized generously: even 30 simultaneous join/leave events fit.
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