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fix(host/audio): drive the Linux virtual mic with RT_PROCESS (was silent)

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The punktfunk-mic PipeWire source connected without RT_PROCESS, so it ran as an
async/main-loop node. In the host's busy multi-stream graph (desktop audio + video
capture + the session) it never acquired a driver, stayed suspended, and its
process() callback never fired — every recorder reading the remote mic heard pure
silence (the long-standing "Linux host mic broken"). Connect the mic stream with
RT_PROCESS so it is a synchronous node that joins its consumer's driver group and
is actually driven.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
Enrico Bühler
2026-06-28 12:46:06 +00:00
parent 238501597e
commit 4c8af3eb70
1 changed files with 8 additions and 1 deletions
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crates/punktfunk-host/src/audio/linux/mod.rs
+8 -1
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@@ -320,11 +320,18 @@ fn mic_pw_thread(
.into_inner(); .into_inner();
let mut params = [Pod::from_bytes(&values).context("mic pod from bytes")?]; let mut params = [Pod::from_bytes(&values).context("mic pod from bytes")?];
// RT_PROCESS: run the producer callback on PipeWire's realtime data loop, so the source is a
// *synchronous* graph node that joins its consumer's driver group and is actually driven. Without
// it the node is async/main-loop and, in the host's busy multi-stream graph (desktop-audio +
// video capture + the session), never acquires a driver — it stays suspended and its process()
// never fires, so every recorder hears pure silence (the long-standing "Linux host mic broken").
stream stream
.connect( .connect(
spa::utils::Direction::Output, // we PRODUCE samples (a source) spa::utils::Direction::Output, // we PRODUCE samples (a source)
None, None,
pw::stream::StreamFlags::AUTOCONNECT | pw::stream::StreamFlags::MAP_BUFFERS, pw::stream::StreamFlags::AUTOCONNECT
| pw::stream::StreamFlags::MAP_BUFFERS
| pw::stream::StreamFlags::RT_PROCESS,
&mut params, &mut params,
) )
.context("pw mic stream connect")?; .context("pw mic stream connect")?;