feat: extend hardware latency reporting to more hosts

CHANGELOG.md

@@ -31,12 +31,20 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - **ALSA**: Polling errors trigger underrun recovery instead of looping.
 - **ALSA**: Try to resume from hardware after a system suspend.
 - **ASIO**: `Device::driver`, `asio_streams`, and `current_callback_flag` are no longer `pub`.
+- **ASIO**: Timestamps now include driver-reported hardware latency.
+- **CoreAudio**: Timestamps now include device latency and safety offset.
+- **JACK**: Timestamps now use the precise hardware deadline.
 - **Linux/BSD**: Default host now is, in order from first to last available: PipeWire, PulseAudio, ALSA.
+- **WASAPI**: Timestamps now include hardware pipeline latency.
+- **WebAudio**: Timestamps now include base and output latency.
+- **WebAudio**: Initial buffer scheduling offset now scales with buffer duration.
 
 ### Fixed
 
 - Reintroduce `audio_thread_priority` feature.
 - Fix numeric overflows in calls to create `StreamInstant` in ASIO, CoreAudio and JACK.
+- **AAudio**: Fix thread lock when a stream is dropped before it fully starts.
+- **AAudio**: Fix invalid capture and playback timestamps.
 - **ALSA**: Fix capture stream hanging or spinning on overruns.
 - **ALSA**: Fix non-monotonic `StreamInstant` during stream startup.
 - **ALSA**: Fix spurious timestamp errors during stream startup.
@@ -46,8 +54,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - **ASIO**: Fix device enumeration and stream creation failing when called from spawned threads.
 - **CoreAudio**: Fix undefined behaviour and silent failure in loopback device creation.
 - **Emscripten**: Fix build failure introduced by newer `wasm-bindgen` versions.
-- **AAudio**: Fix thread lock when a stream is dropped before it fully starts.
-- **AAudio**: Fix invalid capture and playback timestamps.
+- **JACK**: Fix input capture timestamp using callback execution time instead of cycle start.
 
 ## [0.17.3] - 2026-02-18
 

asio-sys/CHANGELOG.md

@@ -5,6 +5,11 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
+### Added
+- Added `Driver::latencies()`
+
 ## [0.2.6] - 2026-02-18
 
 ### Fixed
@@ -82,6 +87,7 @@ Initial release.
 - Support for MSVC toolchain on Windows
 - Basic error types: `AsioError`, `LoadDriverError`
 
+[Unreleased]: https://github.com/RustAudio/cpal/compare/asio-sys-v0.2.6...HEAD
 [0.2.6]: https://github.com/RustAudio/cpal/compare/asio-sys-v0.2.5...asio-sys-v0.2.6
 [0.2.5]: https://github.com/RustAudio/cpal/compare/asio-sys-v0.2.4...asio-sys-v0.2.5
 [0.2.4]: https://github.com/RustAudio/cpal/compare/asio-sys-v0.2.3...asio-sys-v0.2.4

asio-sys/asio_stub_bindings.rs

@@ -137,6 +137,13 @@ pub unsafe extern "C" fn ASIOGetChannels(_ins: *mut c_long, _outs: *mut c_long)
     0
 }
 #[no_mangle]
+pub unsafe extern "C" fn ASIOGetLatencies(
+    _in_latency: *mut c_long,
+    _out_latency: *mut c_long,
+) -> ASIOError {
+    0
+}
+#[no_mangle]
 pub unsafe extern "C" fn ASIOGetChannelInfo(_info: *mut ASIOChannelInfo) -> ASIOError {
     0
 }

asio-sys/build.rs

@@ -228,6 +228,7 @@ fn create_bindings(cpal_asio_dir: &PathBuf) {
         .allowlist_function("ASIOGetChannels")
         .allowlist_function("ASIOGetChannelInfo")
         .allowlist_function("ASIOGetBufferSize")
+        .allowlist_function("ASIOGetLatencies")
         .allowlist_function("ASIOGetSamplePosition")
         .allowlist_function("ASIOOutputReady")
         .allowlist_function("get_sample_rate")

asio-sys/src/bindings/mod.rs

@@ -458,6 +458,19 @@ impl Driver {
         Ok(channel)
     }
 
+    /// Get the input and output hardware latency in frames.
+    pub fn latencies(&self) -> Result<(c_long, c_long), AsioError> {
+        let mut input_latency: c_long = 0;
+        let mut output_latency: c_long = 0;
+        unsafe {
+            asio_result!(ai::ASIOGetLatencies(
+                &mut input_latency,
+                &mut output_latency
+            ))?;
+        }
+        Ok((input_latency, output_latency))
+    }
+
     /// Get the min and max supported buffersize of the driver.
     pub fn buffersize_range(&self) -> Result<(c_long, c_long), AsioError> {
         let buffer_sizes = asio_get_buffer_sizes()?;