Capture chosen apps instead of all system audio #11

Merged

erdoar merged 1 commit from claude/per-app-capture into main

2026-10-10 03:55:13 +00:00

erdoar commented

2026-10-10 03:13:10 +00:00

(Migrated from github.com)

Summary

A new Apps input taps only the processes of the ticked apps, using CATapDescription(stereoMixdownOfProcesses:). Only those apps are muted at the speakers and heard through Plug's effects. Everything else plays normally.
AudioProcesses (PlugEngine) lists Core Audio's process objects (PID, bundle ID, playing or not), leaving out Plug itself.
AppKey (PlugCore) groups helper processes with their app, e.g. com.google.Chrome.helper.Renderer → com.google.Chrome, so browsers and Electron apps are captured whole.
SystemAudioTap takes a target: everything except Plug, or only given processes.
The app shows apps that are playing, plus ordinary apps that have opened audio, with checkboxes and a refresh button. Chosen apps are saved. Settings files from before this field still load.

Tested

Mac mini M4, macOS 15: swift test passes all tests, as reported by the owner.
Linux, Swift 6.0.3: 24 tests pass, including AppKey grouping, captured-apps round trip, and loading an older settings file.

Known limits

Processes are looked up when capture starts. An app opened while Plug runs joins at the next Stop and Start.
Safari and other WebKit apps play web audio from a shared process, so they're listed and captured together as "Safari and web views".

🤖 Generated with Claude Code

https://claude.ai/code/session_011C96TJ2L7nzVMFTH7raNu5

## Summary - A new **Apps** input taps only the processes of the ticked apps, using `CATapDescription(stereoMixdownOfProcesses:)`. Only those apps are muted at the speakers and heard through Plug's effects. Everything else plays normally. - `AudioProcesses` (PlugEngine) lists Core Audio's process objects (PID, bundle ID, playing or not), leaving out Plug itself. - `AppKey` (PlugCore) groups helper processes with their app, e.g. `com.google.Chrome.helper.Renderer` → `com.google.Chrome`, so browsers and Electron apps are captured whole. - `SystemAudioTap` takes a target: everything except Plug, or only given processes. - The app shows apps that are playing, plus ordinary apps that have opened audio, with checkboxes and a refresh button. Chosen apps are saved. Settings files from before this field still load. ## Tested - Mac mini M4, macOS 15: `swift test` passes all tests, as reported by the owner. - Linux, Swift 6.0.3: 24 tests pass, including AppKey grouping, captured-apps round trip, and loading an older settings file. ## Known limits - Processes are looked up when capture starts. An app opened while Plug runs joins at the next Stop and Start. - Safari and other WebKit apps play web audio from a shared process, so they're listed and captured together as "Safari and web views". 🤖 Generated with [Claude Code](https://claude.com/claude-code) https://claude.ai/code/session_011C96TJ2L7nzVMFTH7raNu5