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fix(audio): use WebRTC VAD on iOS

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This commit is contained in:
Edison Jwa
2026-05-31 22:30:28 +09:00
parent c02d4e6df3
commit 6f7063971d
6 changed files with 119 additions and 189 deletions
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crates/chanora_audio/Cargo.toml
+1 -7
View File
@@ -17,7 +17,7 @@ sonora = "0.1"
webrtc-vad = "0.4"
# ndarray is required by ort's tensor construction API and by
# Silero VAD ONNX inference across all platforms.
# Silero VAD ONNX inference on non-iOS targets.
ndarray = "0.17"
# Opus encoder. tsclientlib already pulls this; we depend explicitly so
@@ -50,12 +50,6 @@ coreaudio-rs = "0.14"
# on the main queue to avoid the VPIO RPC timeout on iOS simulator.
dispatch2 = "0.3"
[target.'cfg(target_os = "ios")'.dependencies]
# ONNX Runtime Rust binding for Silero VAD v6 (P1 VAD_002). The official
# iOS CocoaPod ships ONNX Runtime as a static framework, so iOS links it
# into chanora_bridge at build time instead of loading a dylib at runtime.
ort = { version = "2.0.0-rc.12", default-features = false, features = ["std", "ndarray"] }
[target.'cfg(not(target_os = "ios"))'.dependencies]
ort = { version = "2.0.0-rc.12", default-features = false, features = ["load-dynamic", "ndarray", "api-24"] }
crates/chanora_audio/src/audio_processing.rs
+14 -1
View File
@@ -100,6 +100,16 @@ pub enum VadBackend {
Disabled,
}
#[cfg(target_os = "ios")]
fn default_vad_backend() -> VadBackend {
VadBackend::WebrtcVad
}
#[cfg(not(target_os = "ios"))]
fn default_vad_backend() -> VadBackend {
VadBackend::SileroOnnx
}
impl VadBackend {
/// Stable bridge/debug string.
pub fn as_str(self) -> &'static str {
@@ -164,7 +174,7 @@ impl Default for AudioProcessingConfig {
route: AudioRoute::Speaker,
ios_mode: IosVoiceProcessingMode::PlatformVoiceProcessing,
processing_backend: AudioBackend::PlatformVoiceProcessing,
vad_backend: VadBackend::SileroOnnx,
vad_backend: default_vad_backend(),
aec: EffectOwner::Platform,
// iOS VPIO owns NS/AGC on the default shipping path. Software
// effects are opt-in through the experimental raw route only.
@@ -242,6 +252,9 @@ mod tests {
assert_eq!(config.aec, EffectOwner::Platform);
assert_eq!(config.ns, EffectOwner::Platform);
assert_eq!(config.agc, EffectOwner::Platform);
#[cfg(target_os = "ios")]
assert_eq!(config.vad_backend, VadBackend::WebrtcVad);
#[cfg(not(target_os = "ios"))]
assert_eq!(config.vad_backend, VadBackend::SileroOnnx);
}
crates/chanora_audio/src/ios_raw_unit.rs
+9 -57
View File
@@ -116,9 +116,7 @@ mod inner {
mic_gain: f32,
voice_activity_selector: Option<Arc<crate::TransmitModeSelector>>,
vad_detector: crate::vad::WebRtcFallbackVad,
silero_vad_worker: Option<crate::vad::silero_onnx::SileroOnnxVadWorker>,
current_vad_backend: crate::VadBackend,
silero_model_epoch: u64,
capture_frame_seq: u64,
vad_state: crate::voice_activity::VoiceActivityStateMachine,
/// Processing config — retained for route-change reloads.
@@ -154,9 +152,7 @@ mod inner {
mic_gain: params.mic_gain,
voice_activity_selector: params.voice_activity_selector.clone(),
vad_detector: crate::vad::WebRtcFallbackVad::default(),
silero_vad_worker: None,
current_vad_backend: crate::VadBackend::WebrtcVad,
silero_model_epoch: crate::vad::silero_model_epoch(),
capture_frame_seq: 0,
vad_state: crate::voice_activity::VoiceActivityStateMachine::default(),
audio_processing_config: params.audio_processing_config.clone(),
@@ -276,7 +272,6 @@ mod inner {
.map(|selector| selector.mode() == crate::TransmitMode::VoiceActivity)
.unwrap_or(false);
if !voice_activity_mode {
self.silero_vad_worker = None;
self.current_vad_backend = crate::VadBackend::Disabled;
self.fallback_warned_backend = None;
self.audio_processing_stats.set_vad_fallback_active(false);
@@ -298,37 +293,20 @@ mod inner {
);
}
// Switch VAD backend only while VoiceActivity mode is active.
let silero_epoch = crate::vad::silero_model_epoch();
let silero_changed = voice_activity_mode
&& vad_backend == crate::VadBackend::SileroOnnx
&& silero_epoch != self.silero_model_epoch;
if voice_activity_mode && (vad_backend != self.current_vad_backend || silero_changed) {
if voice_activity_mode && vad_backend != self.current_vad_backend {
self.current_vad_backend = vad_backend;
self.silero_model_epoch = silero_epoch;
self.fallback_warned_backend = None;
match vad_backend {
crate::VadBackend::SileroOnnx => {
let path = crate::vad::silero_model_bundle_path();
self.silero_vad_worker =
crate::vad::silero_onnx::SileroOnnxVadWorker::try_new(&path);
if self.silero_vad_worker.is_none() {
tracing::warn!(
target: "chanora_audio",
"Silero VAD model not found at {path}; falling back to WebRTC VAD"
);
}
}
_ => {
self.silero_vad_worker = None;
}
if vad_backend == crate::VadBackend::SileroOnnx {
self.mark_vad_fallback_active(crate::VadBackend::SileroOnnx);
self.audio_processing_stats.set_vad_fallback_active(true);
} else {
self.audio_processing_stats.set_vad_fallback_active(false);
}
self.vad_state.reset();
}
let (vad_probability, active) = if voice_activity_mode {
self.capture_frame_seq = self.capture_frame_seq.wrapping_add(1);
let capture_seq = self.capture_frame_seq;
let mut used_fallback_vad = false;
let vad = if vad_backend == crate::VadBackend::Disabled {
crate::vad::VadOutput {
@@ -336,35 +314,9 @@ mod inner {
speech: true,
}
} else if vad_backend == crate::VadBackend::SileroOnnx {
if let Some(worker) = self.silero_vad_worker.as_ref() {
let enqueued = worker.try_send(capture_seq, &frame);
if !worker.is_stale(capture_seq) {
let p = worker.latest_probability();
crate::vad::VadOutput {
probability: p,
speech: p >= 0.5,
}
} else if enqueued {
crate::vad::VadOutput {
probability: 0.0,
speech: false,
}
} else {
used_fallback_vad = true;
self.mark_vad_fallback_active(vad_backend);
crate::vad::VoiceActivityDetector::process_10ms(
&mut self.vad_detector,
&frame,
)
}
} else {
used_fallback_vad = true;
self.mark_vad_fallback_active(vad_backend);
crate::vad::VoiceActivityDetector::process_10ms(
&mut self.vad_detector,
&frame,
)
}
used_fallback_vad = true;
self.mark_vad_fallback_active(vad_backend);
crate::vad::VoiceActivityDetector::process_10ms(&mut self.vad_detector, &frame)
} else {
crate::vad::VoiceActivityDetector::process_10ms(&mut self.vad_detector, &frame)
};
crates/chanora_audio/src/ios_voice_unit.rs
+72 -109
View File
@@ -48,20 +48,15 @@
//!
//! `coreaudio::audio_unit::AudioUnit` is `Send` but `!Sync` — the
//! AudioUnit internally holds the C `AudioUnit` opaque pointer and
//! the wrapper's destructor calls `AudioComponentInstanceDispose`,
//! which (per Apple's threading rules) must be called from the
//! thread that owns the unit. We open the unit on the same thread
//! that calls `Self::start` (the tokio worker that runs
//! `chanora_core::ChanoraSession::start_audio`, the same pattern
//! cpal + SDL use) and never move it. The outer `AudioEngine`
//! already carries an `unsafe impl Send` to satisfy the same
//! constraint for cpal's `!Send` Stream type; that impl covers
//! VPIO too.
//!
//! Dropping `IosVoiceUnit` calls `audio_unit.stop()` via the
//! wrapper's `Drop`, which detaches the render + input callbacks
//! and stops the unit. The AudioHandler + CaptureState `Arc`s the
//! callbacks held are then released.
//! the wrapper's destructor calls `AudioComponentInstanceDispose`.
//! `IosVoiceUnit` stores the unit as `Option<AudioUnit>` so initial
//! setup and lifecycle operations can dispatch CoreAudio
//! initialize/start/stop calls to `DispatchQueue::main()` while the
//! wrapper keeps ownership and preserves the render/input callback
//! state in the surrounding `Arc`s. `restart`, `pause`, and
//! `resume` may temporarily move the unit through that helper, and
//! `Drop` stops it if still present before those callback `Arc`s are
//! released.
//!
//! ## What this file does NOT do
//!
@@ -143,13 +138,8 @@ struct IosCaptureState {
mic_gain: f32,
voice_activity_selector: Option<Arc<crate::TransmitModeSelector>>,
vad_detector: crate::vad::WebRtcFallbackVad,
/// Background Silero worker — enqueues frames off the realtime
/// callback and publishes the latest probability atomically.
silero_vad_worker: Option<crate::vad::silero_onnx::SileroOnnxVadWorker>,
/// Last VAD backend we configured — used to detect backend changes.
current_vad_backend: crate::VadBackend,
/// Last observed configured Silero model epoch.
silero_model_epoch: u64,
fallback_warned_backend: Option<crate::VadBackend>,
vad_state: crate::voice_activity::VoiceActivityStateMachine,
audio_processing_config: Arc<Mutex<crate::AudioProcessingConfig>>,
@@ -187,9 +177,7 @@ impl IosCaptureState {
mic_gain: params.mic_gain,
voice_activity_selector: params.voice_activity_selector.clone(),
vad_detector: crate::vad::WebRtcFallbackVad::default(),
silero_vad_worker: None,
current_vad_backend: crate::VadBackend::WebrtcVad,
silero_model_epoch: crate::vad::silero_model_epoch(),
fallback_warned_backend: None,
vad_state: crate::voice_activity::VoiceActivityStateMachine::default(),
audio_processing_config: params.audio_processing_config.clone(),
@@ -349,7 +337,7 @@ impl IosCaptureState {
false,
false,
true,
crate::VadBackend::SileroOnnx,
crate::VadBackend::WebrtcVad,
crate::voice_activity::VAD_HANGOVER_MS,
false,
crate::AudioRoute::Unknown,
@@ -362,18 +350,12 @@ impl IosCaptureState {
.map(|selector| selector.mode() == crate::TransmitMode::VoiceActivity)
.unwrap_or(false);
if !voice_activity_mode {
self.silero_vad_worker = None;
self.current_vad_backend = crate::VadBackend::Disabled;
self.fallback_warned_backend = None;
self.audio_processing_stats.set_vad_fallback_active(false);
}
// Switch VAD backend only while VoiceActivity mode is active.
let silero_model_epoch = crate::vad::silero_model_epoch();
let silero_model_changed = voice_activity_mode
&& vad_backend == crate::VadBackend::SileroOnnx
&& silero_model_epoch != self.silero_model_epoch;
if let Ok(mut recorder_guard) = self.wav_recorder.try_lock() {
if debug_wav_dump_enabled {
if recorder_guard.is_none() {
@@ -387,35 +369,14 @@ impl IosCaptureState {
}
}
if voice_activity_mode && (vad_backend != self.current_vad_backend || silero_model_changed)
{
if voice_activity_mode && vad_backend != self.current_vad_backend {
self.current_vad_backend = vad_backend;
self.fallback_warned_backend = None;
self.silero_model_epoch = silero_model_epoch;
match vad_backend {
crate::VadBackend::SileroOnnx => {
// Attempt to load Silero model from the well-known
// bundle path. The actual inference runs on a
// background worker; the callback only enqueues
// 10 ms frames and falls back to WebRTC if the
// worker is missing or stale.
let model_path = crate::vad::silero_model_bundle_path();
self.silero_vad_worker =
crate::vad::silero_onnx::SileroOnnxVadWorker::try_new(&model_path);
if self.silero_vad_worker.is_none() {
warn!(
target: "chanora_audio",
"Silero VAD model not found at {model_path}; falling back to WebRTC VAD"
);
self.mark_vad_fallback_active(crate::VadBackend::SileroOnnx);
}
self.audio_processing_stats
.set_vad_fallback_active(self.silero_vad_worker.is_none());
}
_ => {
self.silero_vad_worker = None;
self.audio_processing_stats.set_vad_fallback_active(false);
}
if vad_backend == crate::VadBackend::SileroOnnx {
self.mark_vad_fallback_active(crate::VadBackend::SileroOnnx);
self.audio_processing_stats.set_vad_fallback_active(true);
} else {
self.audio_processing_stats.set_vad_fallback_active(false);
}
// Reset VAD state machine timers on backend switch.
self.vad_state = crate::voice_activity::VoiceActivityStateMachine::new(
@@ -457,7 +418,6 @@ impl IosCaptureState {
// VAD: only evaluate while VoiceActivity mode is active.
let (vad_probability, gate_open) = if voice_activity_mode {
self.capture_frame_seq = self.capture_frame_seq.wrapping_add(1);
let capture_seq = self.capture_frame_seq;
let mut used_fallback_vad = false;
let vad = if vad_backend == crate::VadBackend::Disabled {
crate::vad::VadOutput {
@@ -465,32 +425,9 @@ impl IosCaptureState {
speech: true,
}
} else if vad_backend == crate::VadBackend::SileroOnnx {
if let Some(worker) = self.silero_vad_worker.as_ref() {
let enqueued = worker.try_send(capture_seq, &frame);
if !worker.is_stale(capture_seq) {
let probability = worker.latest_probability();
crate::vad::VadOutput {
probability,
speech: probability >= 0.5,
}
} else if enqueued {
crate::vad::VadOutput {
probability: 0.0,
speech: false,
}
} else {
used_fallback_vad = true;
self.mark_vad_fallback_active(crate::VadBackend::SileroOnnx);
crate::vad::VoiceActivityDetector::process_10ms(
&mut self.vad_detector,
&frame,
)
}
} else {
used_fallback_vad = true;
self.mark_vad_fallback_active(crate::VadBackend::SileroOnnx);
crate::vad::VoiceActivityDetector::process_10ms(&mut self.vad_detector, &frame)
}
used_fallback_vad = true;
self.mark_vad_fallback_active(crate::VadBackend::SileroOnnx);
crate::vad::VoiceActivityDetector::process_10ms(&mut self.vad_detector, &frame)
} else {
crate::vad::VoiceActivityDetector::process_10ms(&mut self.vad_detector, &frame)
};
@@ -578,10 +515,39 @@ pub struct IosVoiceUnit {
// Drop = stop the audio unit (severs render callback). The
// wrapper's own Drop calls AudioComponentInstanceDispose
// after stop returns.
unit: AudioUnit,
unit: Option<AudioUnit>,
}
impl IosVoiceUnit {
#[cfg(target_os = "ios")]
fn exec_main_queue_lifecycle(
&mut self,
op: impl FnOnce(&mut AudioUnit) -> Result<(), String> + Send + 'static,
) -> Result<(), AudioError> {
let unit = self
.unit
.take()
.ok_or_else(|| AudioError::Backend("vpio lifecycle: audio unit missing".to_string()))?;
let (tx, rx) = std::sync::mpsc::sync_channel::<Result<(), String>>(1);
let unit_arc = Arc::new(Mutex::new(Some(unit)));
let unit_arc2 = Arc::clone(&unit_arc);
dispatch2::DispatchQueue::main().exec_async(move || {
let mut guard = unit_arc2.lock().unwrap();
let unit = guard.as_mut().unwrap();
let _ = tx.send(op(unit));
});
let result = match rx.recv() {
Ok(result) => result,
Err(_) => Err("vpio lifecycle: main thread channel closed unexpectedly".to_string()),
};
self.unit = unit_arc.lock().unwrap().take();
result.map_err(AudioError::Backend)
}
/// Open a VoiceProcessingIO AudioUnit, pin its stream format
/// to 48 kHz Int16 mono on both buses, install render + input
/// callbacks, and start it. The unit begins pumping audio
@@ -994,7 +960,7 @@ impl IosVoiceUnit {
),
}
Ok(Self { unit })
Ok(Self { unit: Some(unit) })
}
/// Restart the audio unit after route change handling.
@@ -1003,23 +969,18 @@ impl IosVoiceUnit {
/// VoiceProcessingIO unit through an uninitialize/reinitialize
/// cycle, then start again.
///
/// Called from the Flutter method channel handler which runs on
/// the main isolate — that runs on the main thread — so the
/// CoreAudio RPC is already on the correct thread here.
#[cfg(target_os = "ios")]
pub fn restart(&mut self) -> Result<(), AudioError> {
self.unit
.stop()
.map_err(|e| AudioError::Backend(format!("vpio restart stop: {e}")))?;
self.unit
.uninitialize()
.map_err(|e| AudioError::Backend(format!("vpio restart uninit: {e}")))?;
self.unit
.initialize()
.map_err(|e| AudioError::Backend(format!("vpio restart init: {e}")))?;
self.unit
.start()
.map_err(|e| AudioError::Backend(format!("vpio restart start: {e}")))?;
self.exec_main_queue_lifecycle(|unit| {
unit.stop().map_err(|e| format!("vpio restart stop: {e}"))?;
unit.uninitialize()
.map_err(|e| format!("vpio restart uninit: {e}"))?;
unit.initialize()
.map_err(|e| format!("vpio restart init: {e}"))?;
unit.start()
.map_err(|e| format!("vpio restart start: {e}"))?;
Ok(())
})?;
info!(target: "chanora_audio", "ios VPIO audio unit restarted");
Ok(())
}
@@ -1027,17 +988,17 @@ impl IosVoiceUnit {
/// Pause the audio unit during an interruption.
#[cfg(target_os = "ios")]
pub fn pause(&mut self) -> Result<(), AudioError> {
self.unit
.stop()
.map_err(|e| AudioError::Backend(format!("vpio pause stop: {e}")))
self.exec_main_queue_lifecycle(|unit| {
unit.stop().map_err(|e| format!("vpio pause stop: {e}"))
})
}
/// Resume the audio unit after an interruption.
#[cfg(target_os = "ios")]
pub fn resume(&mut self) -> Result<(), AudioError> {
self.unit
.start()
.map_err(|e| AudioError::Backend(format!("vpio resume start: {e}")))
self.exec_main_queue_lifecycle(|unit| {
unit.start().map_err(|e| format!("vpio resume start: {e}"))
})
}
}
@@ -1046,10 +1007,12 @@ impl Drop for IosVoiceUnit {
// Stop the audio unit so the render callback no longer
// fires. The coreaudio-rs wrapper's own Drop calls
// AudioComponentInstanceDispose afterwards.
if let Err(e) = self.unit.stop() {
warn!(target: "chanora_audio", error = %e, "ios audio unit stop on drop failed");
} else {
info!(target: "chanora_audio", "ios audio unit stopped");
if let Some(unit) = self.unit.as_mut() {
if let Err(e) = unit.stop() {
warn!(target: "chanora_audio", error = %e, "ios audio unit stop on drop failed");
} else {
info!(target: "chanora_audio", "ios audio unit stopped");
}
}
}
}
crates/chanora_audio/src/route_policy.rs
+9 -4
View File
@@ -30,7 +30,7 @@ pub fn ios_route_policy(route: AudioRoute) -> AudioProcessingConfig {
route,
ios_mode: IosVoiceProcessingMode::PlatformVoiceProcessing,
processing_backend: AudioBackend::PlatformVoiceProcessing,
vad_backend: VadBackend::SileroOnnx,
vad_backend: VadBackend::WebrtcVad,
aec: EffectOwner::Platform,
// VPIO owns NS and AGC on the shipping default path (IOSP_002/003).
ns: EffectOwner::Platform,
@@ -43,7 +43,7 @@ pub fn ios_route_policy(route: AudioRoute) -> AudioProcessingConfig {
route,
ios_mode: IosVoiceProcessingMode::PlatformVoiceProcessing,
processing_backend: AudioBackend::Noop,
vad_backend: VadBackend::SileroOnnx,
vad_backend: VadBackend::WebrtcVad,
// No AEC needed for wired headset (no acoustic echo path).
aec: EffectOwner::Off,
// Conservative NS/AGC: optional, not forced.
@@ -57,7 +57,7 @@ pub fn ios_route_policy(route: AudioRoute) -> AudioProcessingConfig {
route,
ios_mode: IosVoiceProcessingMode::PlatformVoiceProcessing,
processing_backend: AudioBackend::PlatformVoiceProcessing,
vad_backend: VadBackend::SileroOnnx,
vad_backend: VadBackend::WebrtcVad,
// BT HFP manages its own AEC in the headset firmware.
aec: EffectOwner::Off,
ns: EffectOwner::Conservative,
@@ -87,7 +87,7 @@ pub fn ios_route_policy(route: AudioRoute) -> AudioProcessingConfig {
route,
ios_mode: IosVoiceProcessingMode::PlatformVoiceProcessing,
processing_backend: AudioBackend::Noop,
vad_backend: VadBackend::SileroOnnx,
vad_backend: VadBackend::WebrtcVad,
// Safe fallback: AEC off until route is classified.
aec: EffectOwner::Off,
ns: EffectOwner::Off,
@@ -146,6 +146,7 @@ mod tests {
cfg.ios_mode,
IosVoiceProcessingMode::PlatformVoiceProcessing
);
assert_eq!(cfg.vad_backend, VadBackend::WebrtcVad);
}
#[test]
@@ -156,6 +157,7 @@ mod tests {
AudioBackend::PlatformVoiceProcessing
);
assert_eq!(cfg.aec, EffectOwner::Platform);
assert_eq!(cfg.vad_backend, VadBackend::WebrtcVad);
}
#[test]
@@ -163,12 +165,14 @@ mod tests {
let cfg = ios_route_policy(AudioRoute::WiredHeadset);
assert_eq!(cfg.aec, EffectOwner::Off);
assert_eq!(cfg.processing_backend, AudioBackend::Noop);
assert_eq!(cfg.vad_backend, VadBackend::WebrtcVad);
}
#[test]
fn bluetooth_hfp_disables_app_aec() {
let cfg = ios_route_policy(AudioRoute::BluetoothHfp);
assert_eq!(cfg.aec, EffectOwner::Off);
assert_eq!(cfg.vad_backend, VadBackend::WebrtcVad);
}
#[test]
@@ -183,6 +187,7 @@ mod tests {
fn unknown_route_safe_fallback_no_aec() {
let cfg = ios_route_policy(AudioRoute::Unknown);
assert_eq!(cfg.aec, EffectOwner::Off);
assert_eq!(cfg.vad_backend, VadBackend::WebrtcVad);
}
#[test]
crates/chanora_audio/src/vad/mod.rs
+14 -11
View File
@@ -1,11 +1,12 @@
//! Voice activity detection backends and helpers.
//!
//! iOS capture feeds VoiceProcessingIO-processed microphone frames into
//! this module. The production path prefers a model-backed detector when
//! available, and otherwise uses the realtime-safe fallback below so
//! this module and uses the realtime-safe WebRTC fallback. Other
//! platforms may use a model-backed detector when available so
//! VoiceActivity mode never collapses back to Continuous transmit.
pub mod resampler;
#[cfg(not(target_os = "ios"))]
pub mod silero_onnx;
use std::sync::atomic::{AtomicU64, Ordering};
@@ -15,6 +16,7 @@ use crate::frame::{f32_to_i16, i16_to_f32};
use crate::AudioError;
use resampler::{Downsampler48to16, INPUT_FRAME_10MS};
#[cfg(not(target_os = "ios"))]
pub use silero_onnx::SileroOnnxVad;
/// Voice activity detector output for one 10 ms frame.
@@ -111,11 +113,11 @@ fn silero_model_path_override() -> &'static RwLock<Option<String>> {
SILERO_MODEL_PATH_OVERRIDE.get_or_init(|| RwLock::new(None))
}
/// Configure the preferred Silero ONNX model path.
/// Configure the preferred Silero ONNX model path on supported platforms.
///
/// The path is validated eagerly. A successful call increments the
/// model epoch so running audio backends can reload the model without
/// an app restart.
/// model epoch so running non-iOS audio backends can reload the model
/// without an app restart.
pub fn set_silero_model_path(path: &str) -> Result<(), AudioError> {
let path = path.trim();
if path.is_empty() {
@@ -141,13 +143,13 @@ pub fn silero_model_epoch() -> u64 {
SILERO_MODEL_EPOCH.load(Ordering::Relaxed)
}
/// Return the expected path of the Silero VAD v6 ONNX model.
/// Return the expected path of the Silero VAD v6 ONNX model on
/// supported platforms.
/// The model is shipped as a Flutter asset and copied to the app's
/// data directory by the Dart-side asset loader.
///
/// On iOS/Android the model lives in the app's Documents/files
/// directory. On desktop, the caller should set the path explicitly
/// via `set_silero_model_path`.
/// Android and macOS may use app data/Documents locations. Desktop
/// callers can set the path explicitly via `set_silero_model_path`.
pub fn silero_model_bundle_path() -> String {
if let Ok(guard) = silero_model_path_override().read() {
if let Some(path) = guard.as_ref() {
@@ -155,8 +157,9 @@ pub fn silero_model_bundle_path() -> String {
}
}
// iOS: Documents directory (written by Flutter asset loader).
// macOS: same Documents pattern.
// macOS: Documents directory (written by Flutter asset loader).
// iOS keeps this fallback only for API compatibility; the ONNX
// detector is not compiled into iOS builds.
#[cfg(any(target_os = "ios", target_os = "macos"))]
{
if let Ok(home) = std::env::var("HOME") {