Windows (WASAPI) support: cfg-gate Linux-only virtual mic

The Linux/PipeWire virtual mic (pactl, WirePlumber fix, signal restore)
is now behind target_os cfg; on Windows/macOS it compiles to stubs and
virtual mic defaults to off. Use VB-CABLE/BlackHole as the output device.
Cross-checked with cargo check --target x86_64-pc-windows-gnu (0 errors).

README.md

@@ -40,7 +40,7 @@ vois.rs turns your microphone into a voice changer in real time: shift pitch and
 | TUI | Full-screen terminal UI with arrow-key + mouse control and live meters |
 | WAV recording | Record the processed audio with the `R` hotkey or `--record` |
 | Test tone | `--tone 220` lets you hear what a preset does without a mic |
-| Cross-platform | Linux (ALSA/PipeWire), macOS (CoreAudio), Windows (WASAPI) |
+| Cross-platform | Linux (ALSA/PipeWire), Windows (WASAPI), macOS (CoreAudio) |
 
 ### Presets
 
@@ -161,7 +161,7 @@ vois.rs превращает твой микрофон в войс-чендже
 | TUI | Полноэкранный интерфейс с управлением стрелками и мышью, живые уровни |
 | Запись в WAV | Клавиша `R` или `--record` |
 | Тестовый тон | `--tone 220` — послушать пресет без микрофона |
-| Кроссплатформенность | Linux (ALSA/PipeWire), macOS (CoreAudio), Windows (WASAPI) |
+| Кроссплатформенность | Linux (ALSA/PipeWire), Windows (WASAPI), macOS (CoreAudio) |
 
 ### Пресеты
 

src/audio/virtual_mic.rs

@@ -1,11 +1,17 @@
-// Virtual microphone setup for PipeWire/PulseAudio.
+// Virtual microphone setup.
 //
-// Creates a "vois.rs" null sink and remaps its monitor source to "vois.rs".
-// The app does NOT hijack the default sink permanently: it briefly points the
-// default sink at `vois.rs` while its own output stream is created (so the
-// processed voice lands in the virtual mic) and restores it right after.
-// Other apps' streams are not moved, so their audio never leaks into the mic.
-use anyhow::{bail, Context, Result};
+// Linux/FreeBSD (PipeWire/PulseAudio): creates a "vois.rs" null sink and
+// remaps its monitor source to "vois.rs", keeps the app's stream routed there
+// and restores the default sink on exit.
+//
+// Other platforms (Windows WASAPI, macOS CoreAudio): no built-in virtual mic.
+// Point the app's output at a virtual cable (e.g. VB-CABLE "CABLE Input" on
+// Windows, BlackHole on macOS) with `-o` and select it in the voice app.
+
+use anyhow::Result;
+#[cfg(any(target_os = "linux", target_os = "freebsd"))]
+use anyhow::{bail, Context};
+#[cfg(any(target_os = "linux", target_os = "freebsd"))]
 use std::process::Command;
 use std::sync::atomic::{AtomicBool, Ordering};
 use std::sync::Arc;
@@ -14,7 +20,11 @@ use std::time::Duration;
 
 pub struct VirtualMic;
 
-/// WirePlumber config that stops it from pinning streams to remembered sinks.
+// ---------------------------------------------------------------------------
+// Linux / FreeBSD implementation (PipeWire / PulseAudio + pactl)
+// ---------------------------------------------------------------------------
+
+#[cfg(any(target_os = "linux", target_os = "freebsd"))]
 fn wireplumber_conf() -> std::path::PathBuf {
     let base = std::env::var("XDG_CONFIG_HOME")
         .map(std::path::PathBuf::from)
@@ -28,6 +38,7 @@ fn wireplumber_conf() -> std::path::PathBuf {
         .join("51-vois.conf")
 }
 
+#[cfg(any(target_os = "linux", target_os = "freebsd"))]
 impl VirtualMic {
     pub fn setup() -> Result<Option<String>> {
         let pactl = "pactl";
@@ -221,6 +232,7 @@ impl VirtualMic {
     }
 }
 
+#[cfg(any(target_os = "linux", target_os = "freebsd"))]
 fn sink_id_named(name: &str) -> Option<String> {
     let out = Command::new("pactl")
         .args(["list", "short", "sinks"])
@@ -235,6 +247,7 @@ fn sink_id_named(name: &str) -> Option<String> {
     None
 }
 
+#[cfg(any(target_os = "linux", target_os = "freebsd"))]
 fn client_names() -> Result<std::collections::HashMap<String, String>> {
     let out = Command::new("pactl")
         .args(["list", "short", "clients"])
@@ -250,6 +263,7 @@ fn client_names() -> Result<std::collections::HashMap<String, String>> {
     Ok(map)
 }
 
+#[cfg(any(target_os = "linux", target_os = "freebsd"))]
 fn sink_inputs() -> Result<Vec<(String, String, String)>> {
     let out = Command::new("pactl")
         .args(["list", "short", "sink-inputs"])
@@ -269,7 +283,39 @@ fn sink_inputs() -> Result<Vec<(String, String, String)>> {
     Ok(inputs)
 }
 
+#[cfg(any(target_os = "linux", target_os = "freebsd"))]
 fn has_entry(list: &str, name: &str) -> bool {
     list.lines()
         .any(|l| l.split_whitespace().nth(1).is_some_and(|n| n == name))
 }
+
+// ---------------------------------------------------------------------------
+// Other platforms: virtual mic is provided externally (VB-CABLE / BlackHole).
+// ---------------------------------------------------------------------------
+
+#[cfg(not(any(target_os = "linux", target_os = "freebsd")))]
+impl VirtualMic {
+    pub fn setup() -> Result<Option<String>> {
+        Ok(None)
+    }
+
+    pub fn get_default_sink() -> Option<String> {
+        None
+    }
+
+    pub fn set_default_sink(_name: &str) {}
+
+    pub fn wait_default_sink(_name: &str) {}
+
+    pub fn keep_others_off(stop: Arc<AtomicBool>, _prev_sink: String) -> thread::JoinHandle<()> {
+        thread::spawn(move || {
+            while !stop.load(Ordering::Relaxed) {
+                thread::sleep(Duration::from_millis(500));
+            }
+        })
+    }
+
+    pub fn restore_on_signal(_prev: String) -> thread::JoinHandle<()> {
+        thread::spawn(|| {})
+    }
+}

src/config.rs

@@ -101,7 +101,8 @@ impl AppConfig {
             virtual_mic: if cli.no_virtual_mic {
                 false
             } else {
-                file.virtual_mic.unwrap_or(true)
+                file.virtual_mic
+                    .unwrap_or(cfg!(any(target_os = "linux", target_os = "freebsd")))
             },
             pitch_correct: cli.pitch_correct.or(file.pitch_correct).unwrap_or(false),
         }

src/main.rs

@@ -104,7 +104,9 @@ fn main() -> Result<()> {
                     "virtual mic ready: use \"{src}\" (or \"vois.rs.monitor\") as your microphone"
                 )
             }
-            Ok(None) => println!("virtual mic setup failed: no source reported"),
+            Ok(None) => println!(
+                "virtual mic not available on this platform: point -o at a virtual cable (e.g. VB-CABLE \"CABLE Input\") and select it in your voice app"
+            ),
             Err(e) => println!("warning: virtual mic setup failed: {e:#}"),
         }
     }