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- pf-presenter: the HUD/title mode line lived inside the match-window (D2)
gate, so an accepted switch from any OTHER trigger (the
PUNKTFUNK_DEBUG_RECONFIGURE lever, a host-side corrective rollback) left the
label stale. Hoisted into its own per-iteration tick that runs whenever a
stream is up.
- docs: pyrowave.md — the Automatic bitrate pin now follows a mid-stream
resize; drop the "resolution changes rebuild the stream" limitation.
Completes the resize-rebuild work whose core landed in 9127c346
(video_pyrowave.rs sequence-header dims sniff + in-place decoder/plane-ring
rebuild with retired-ring lifetime handling, host per-mode ~1.6 bpp re-pin,
128px floor, debug reconfigure lever). On-glass validated on .21
(RTX 5070 Ti, Mutter virtual display): 1080p->720p and 1080p->1440p
mid-stream switches, lossless AND under 2% netem loss — decoder rebuilt in
place, 60 fps sustained (partials during loss), pinned rate re-resolved
199065->88473 / ->353894 kbps, HUD flips to the new mode.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
67 lines
3.4 KiB
Markdown
67 lines
3.4 KiB
Markdown
---
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title: PyroWave (wired-LAN codec)
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description: The opt-in ultra-low-latency wavelet codec for wired links — what it is, the bandwidth it needs, and how to turn it on.
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---
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PyroWave is an **opt-in** video codec mode for links that can afford real bandwidth: wired
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Ethernet, a docked Steam Deck, a 2.5GbE LAN. It trades bitrate for latency — instead of
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H.264/HEVC/AV1 on the GPU's video engine, frames are compressed with
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[PyroWave](https://github.com/Themaister/pyrowave), an intra-only wavelet codec running as plain
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Vulkan compute. Punktfunk vendors a pinned copy and runs it on both ends.
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**It is never selected automatically.** HEVC/AV1 remain the codecs for Wi-Fi and everything
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else; PyroWave engages only when *you* pick it on the client **and** the host supports it. If
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either side can't, the session silently falls back to the normal codec ladder.
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## Why you'd want it
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- **Codec latency drops by an order of magnitude.** Encode and decode each take a fraction of a
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millisecond of GPU compute (measured ~0.15 ms encode / ~0.07 ms decode at 1080p on an
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RTX 5070 Ti), versus one-to-several milliseconds per side for the hardware H.26x pipelines.
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- **Every frame is a keyframe.** There is no GOP, no reference chain, no keyframe round-trip
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after packet loss — a lost frame costs exactly that frame, and the next one is already a
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complete picture. The whole IDR/recovery apparatus that produces loss-time stutter simply
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doesn't exist in this mode.
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- **Uniform frame sizes.** The rate control hits its per-frame byte budget exactly, so the
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pacer sees a flat load instead of 20–40× keyframe spikes.
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## What it costs
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Bandwidth. At the codec's ~1.6 bits-per-pixel operating point (4:2:0, 60 fps):
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| Mode | Bitrate |
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|---|---|
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| 1280×800 @ 60 (Deck) | ≈ 100 Mbps |
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| 1920×1080 @ 60 | ≈ 200 Mbps |
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| 2560×1440 @ 60 | ≈ 355 Mbps |
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| 3840×2160 @ 60 | ≈ 800 Mbps |
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120 Hz doubles these. Gigabit Ethernet tops out around 940 Mbps of payload, so 4K60 wants
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2.5GbE (or a lower rate). **Do not run this over Wi-Fi** — that's what HEVC/AV1 are for.
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Also: PyroWave is **8-bit SDR only**. An HDR session stays on HEVC/AV1 regardless of this
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setting.
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## Turning it on
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1. **Host** (Linux): build/install a host with the `pyrowave` feature. On an NVIDIA host the
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capture path additionally needs `PUNKTFUNK_ENCODER=pyrowave` in `host.env` for the codec to
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be advertised; AMD/Intel hosts advertise it automatically when the feature is present.
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2. **Client** (Linux session client with the `pyrowave` feature): set **Settings → Video
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codec → PyroWave (wired LAN)** in the gamepad console, or launch with
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`PUNKTFUNK_PREFER_PYROWAVE=1`.
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3. Leave the bitrate on Automatic: a PyroWave session pins itself to the ~1.6 bpp rate for
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your mode (≈200 Mbps at 1080p60). An explicit bitrate is honored if you set one, but the
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adaptive-bitrate controller stays off either way — this codec has no useful low-rate
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regime, so under sustained loss the right move is switching back to HEVC, not degrading.
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The pin follows the resolution: a mid-stream resize (e.g. Match window) re-pins the rate
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for the new mode, so resizing a window down also cuts the bandwidth.
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The stats overlay shows `pyrowave` as the decode path when the mode is active.
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## Current limits
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- Linux host + Linux client (including docked Deck) today; the Windows host and the Apple
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native port are tracked on the [roadmap](/docs/roadmap).
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- 8-bit SDR, 4:2:0 only.
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