CapraLink 0.3.1

0.3.0 was never released: 0.3.1 is the first release with these features, and it also includes fixes from an outside security and reliability review.

What's new

• Push-to-talk. Pick a button for each connection and choose Hold to talk (with a short 200 ms tail so word endings aren't cut) or Press to toggle. It works while a game has focus, and a short chirp tells you when you start and stop talking. On the Steam Deck the back grips (L4, L5, R4, R5) work directly, with no Steam Input mapping needed. Windows uses a listen-only method that doesn't take the key away from your game. On a Mac, CapraLink asks for the Input Monitoring permission. If the button's keyboard or controller is unplugged, or keys can't be read for a moment, talking stops at once until the next press.
• Music Mode/Hi-Fi. A new Hi-Fi switch next to Music Mode streams lossless 24-bit audio (about 2.3 Mbit/s each way). Lost packets are re-sent instead of being covered up (never more than were sent, so a misbehaving computer can't use resends to flood the network). If the network can't keep up, it falls back to Music Mode by itself and tries Hi-Fi again after a clean minute. Both computers need 0.3.1 for Music Mode/Hi-Fi; with an older version it simply stays in Music Mode.
• Volume and mute. Send and Receive volume sliders (0–150%) and a Mute button, remembered for each connection. Changes apply instantly, without reconnecting, and fade smoothly instead of clicking.
• Delay readout. The window shows how much delay each direction has, e.g. "You hear them: 45 ms · They hear you: 60 ms".
• One-click updates. From this version on, "New version available!" comes with an Update now button that downloads, checks and installs the update, then restarts CapraLink. (Linux .deb/.rpm installs, and Mac releases that change the audio drivers, still link to the download page.)
• Steam Deck Game Mode plugin. A Decky Loader plugin puts CapraLink in the Quick Access Menu: connection status, Connect/Disconnect, Music Mode, Music Mode/Hi-Fi, Mute, volume, push-to-talk and the delay readout. Download CapraLink-Decky-0.3.1.zip below and install it from Decky's Developer settings (Install Plugin from ZIP File).
• Command-line control. capralink --status, --connect, --disconnect, --music, --hifi, --mute, --volume, --ptt and --ptt-set let scripts control a running CapraLink.
• Accessibility. The whole window works with the keyboard (Tab, Enter/Space, Esc closes menus), every control has a screen-reader label, status changes are announced, "reduce motion" is respected, and text contrast is improved.

Fixed

• Pairing is more reliable. Pairing, or connecting again right after a refused connection, could occasionally fail with a dropped connection (seen mostly on Windows).
• Mac permissions no longer reset with every update. CapraLink is now signed with its own stable certificate, so macOS remembers the microphone and Input Monitoring permissions across updates.
• Safer Mac installer. The installer keeps its temporary files in the private folder macOS gives each install, instead of a shared location.
• Disconnect always works while a connection is starting. Disconnecting while the other computer's connection was still opening your audio devices no longer leaves the two computers connected.
• Settings changed while connecting take effect. Picking another microphone, speaker, channel count or bitrate while a connection is starting no longer gets lost.
• Music Mode rides out longer Wi-Fi dropouts. Wi-Fi stalls longer than half a second are now measured too, so the buffer grows to cover them (up to 1 second), and when it shrinks again it drains smoothly instead of skipping audio.
• Changing a setting never undoes another one. The window and the tray menu now send only the setting you changed.
• Clean sound on low-rate headsets. Playback on devices below 48 kHz (e.g. 16 kHz Bluetooth headsets) no longer has harsh artifacts.
• Less CPU on high-sample-rate devices. Devices running at 96 kHz and above use 2–8× less processing time.
• Quit is always quick. Quit no longer waits while the engine is still starting, and it still stops the engine then (unless it runs in the background).
• A wrong address can't hold up connecting. Something on the network that answers in place of the other computer, but never finishes connecting, is given up after 5 seconds so the right address is tried.
• Automatic reconnects keep trying. If the audio has to be rebuilt and the first reconnect fails, CapraLink keeps retrying (when auto-reconnect is on) instead of staying disconnected.

Good to know

• Mac: because of the new signature, macOS asks for the microphone permission (and Input Monitoring, if you use push-to-talk) one more time after installing 0.3.1. If CapraLink is already listed there, remove it with − and allow it again.
• Windows: the installer isn't code-signed. If Windows' Smart App Control is on, it may block the installer.

Full changelog: v0.2.0...v0.3.1