thomas.kopp
52e55e112f
The null sink and its two loopbacks were loaded at startup and stayed loaded forever. While loaded they link the microphone and the speaker device into a single PipeWire driver group: the microphone drives the graph and the speaker device runs as a clock follower, so every playback stream pays for continuous cross-device resampling. Nothing needs the chain while idle — recording is triggered manually. Build it in toggle_recording() and drop it as soon as the audio is captured, before transcription runs for minutes. Module ids are now derived from pactl instead of tracked in a state file, so a crashed process cannot leave stale ids behind. The state file only holds the device selection. Startup tears down any leftover chain. Loopbacks get latency_msec=200; transcription is offline, and a small buffer would put these nodes on the graph's realtime deadline.