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Lift freeq's AV media plane out of sleek 90f8b89 · on c90f8af80ae93ec3b20ea6adbac32ddb64736940 · nandi · 19d ago
CHANGELOG.md · 1213 lines · 36.2 KBmarkdown
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Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog,
and this project adheres to Semantic Versioning.

Unreleased

Added

  • DeviceBusy error variant to SupportedStreamConfigsError, DefaultStreamConfigError, and
    BuildStreamError for retryable device access errors (EBUSY, EAGAIN).
  • StreamConfig now implements Copy.
  • StreamTrait::buffer_size() to query the stream's current buffer size in frames per callback.
  • device_by_id is now dispatched to each backend's implementation, allowing to override it.
  • ALSA: device_by_id now accepts PCM shorthand names such as hw:0,0 and plughw:foo.
  • PipeWire: New host for Linux and some BSDs using the PipeWire API.
  • PulseAudio: New host for Linux and some BSDs using the PulseAudio API.

Changed

  • Public error enums are now marked #[non_exhaustive] to allow adding variants without
    SemVer-breaking changes.
  • DeviceTrait::build_*_stream now takes StreamConfig by value instead of &StreamConfig
  • AAudio: Device names now include the device type suffix (e.g. "Speaker (Builtin Speaker)")
    for easier identification when enumerating devices.
  • AAudio: supported_input_configs and supported_output_configs now return an error for
    direction-mismatched devices (e.g. querying input configs on an output-only device) instead of
    silently returning an empty list.
  • AAudio: Bump MSRV to 1.85.
  • AAudio: Buffers with default sizes are now dynamically tuned.
  • ALSA: Device disconnection now stops the stream with StreamError::DeviceNotAvailable instead of looping.
  • ALSA: Polling errors trigger underrun recovery instead of looping.
  • ALSA: Try to resume from hardware after a system suspend.
  • ALSA: Loop partial reads and writes to completion.
  • ALSA: Prevent reentrancy issues with non-reentrant plugins and devices.
  • ASIO: Device::driver, asio_streams, and current_callback_flag are no longer pub.
  • ASIO: Timestamps now include driver-reported hardware latency.
  • ASIO: Hardware latency is now re-queried when the driver reports kAsioLatenciesChanged.
  • ASIO: Stream error callback now receives StreamError::BufferUnderrun on kAsioResyncRequest.
  • ASIO: Stream error callback now receives StreamError::StreamInvalidated when the driver reports a sample rate change (sampleRateDidChange) of 1 Hz or more from the configured rate.
  • CoreAudio: Timestamps now include device latency and safety offset.
  • JACK: Timestamps now use the precise hardware deadline.
  • Linux/BSD: Default host in order from first to last available now is: PipeWire, PulseAudio, ALSA.
  • WASAPI: Timestamps now include hardware pipeline latency.
  • WebAudio: Bump MSRV to 1.85.
  • 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.
  • ALSA: Fix spurious timeout errors during polling.
  • ALSA: Fix rare panics when dropping the stream is interrupted.
  • ALSA: Fix timestamp overflows on 32-bit platforms.
  • ASIO: Fix enumeration returning only the first device when using collect.
  • ASIO: Fix device enumeration and stream creation failing when called from spawned threads.
  • ASIO: Fix buffer size not resizing when the driver reports kAsioBufferSizeChange.
  • ASIO: Fix latency not updating when the driver reports kAsioLatenciesChanged.
  • ASIO: Fix distortion when buggy drivers fire the buffer callback multiple times per cycle.
  • CoreAudio: Fix undefined behaviour and silent failure in loopback device creation.
  • Emscripten: Fix build failure introduced by newer wasm-bindgen versions.
  • JACK: Fix input capture timestamp using callback execution time instead of cycle start.

0.17.3 - 2026-02-18

Changed

  • Reverted SemVer-breaking DeviceBusy error variant addition.

Fixed

  • ASIO: Fix linker errors.

0.17.2 - 2026-02-08 [YANKED]

Added

  • DeviceBusy error variant for retriable device access errors (EBUSY, EAGAIN).
  • ALSA: Debug implementations for Host, Device, Stream, and internal types.
  • ALSA: Example demonstrating ALSA error suppression during enumeration.
  • ALSA: Support for native DSD playback.
  • WASAPI: Enable as-necessary resampling in the WASAPI server process.

Changed

  • Bump overall MSRV to 1.78.
  • ALSA: Update alsa dependency to 0.11.
  • ALSA: Bump MSRV to 1.82.
  • CoreAudio: Update core-audio-rs dependency to 0.14.

Fixed

  • ALSA: Enumerating input and output devices no longer interferes with each other.
  • ALSA: Device handles are no longer exclusively held between operations.
  • ALSA: Reduce Valgrind memory leak reports from ALSA global configuration cache.
  • ALSA: Fix possible race condition on drop.
  • ALSA: Fix audio callback stalling when start threshold is not met.

0.17.1 - 2026-01-04

Added

  • ALSA: Default implementation for Device (returns the ALSA "default" device).
  • CI: Checks default/no-default/all feature sets with platform-dependent MSRV for JACK.

Changed

  • ALSA: Devices now report direction from hint metadata and physical hardware probing.

Fixed

  • ALSA: Device enumeration now includes both hints and physical cards.
  • JACK: No longer builds on iOS.
  • WASM: WasmBindgen no longer crashes (regression from 0.17.0).

0.17.0 - 2025-12-20

Added

  • DeviceTrait::id method that returns a stable audio device ID.
  • HostTrait::device_by_id to select a device by its stable ID.
  • Display and FromStr implementations for HostId.
  • Support for custom Hosts, Devices, and Streams.
  • Sample::bits_per_sample method.
  • Copy implementation to InputCallbackInfo and OutputCallbackInfo.
  • StreamError::StreamInvalidated variant for when stream must be rebuilt.
  • StreamError::BufferUnderrun variant for buffer underrun/overrun notifications.
  • Hash implementation to Device for all backends.
  • AAudio: Send and Sync implementations to Stream.
  • AAudio: Support for 12 and 24 kHz sample rates.
  • ALSA: I24 and U24 sample format support (24-bit samples stored in 4 bytes).
  • ALSA: Support for 12, 24, 352.8, 384, 705.6, and 768 kHz sample rates.
  • ALSA: Eq and PartialEq implementations to Device.
  • CI: Native ARM64 Linux support in GitHub Actions.
  • CoreAudio: i8, i32 and I24 sample format support (24-bit samples stored in 4 bytes).
  • CoreAudio: Support for loopback recording (recording system audio output) on macOS > 14.6.
  • CoreAudio: Send implementation to Stream.
  • Emscripten: BufferSize::Fixed validation against supported range.
  • iOS: Complete AVAudioSession integration for device enumeration and buffer size control.
  • JACK: Support for macOS and Windows platforms.
  • JACK: BufferSize::Fixed validation to reject requests that don't match server buffer size.
  • WASAPI: Expose IMMDevice from WASAPI host Device.
  • WASAPI: I24 and U24 sample format support (24-bit samples stored in 4 bytes).
  • WASAPI: Send and Sync implementations to Stream.
  • WebAudio: Send and Sync implementations to Stream.
  • WebAudio: BufferSize::Fixed validation against supported range.

Changed

  • MSRV depends on the platform and at minimum 1.77.
  • Set examples to Rust 2021.
  • SampleRate from struct to u32 type alias.
  • Update audio_thread_priority to 0.34.
  • Migrate CHANGELOG to Keep a Changelog format.
  • AAudio: Configure buffer to ensure consistent callback buffer sizes.
  • AAudio: Buffer size range detection to query the AudioService property correctly.
  • ALSA: Improve BufferSize::Fixed precision and audio callback performance.
  • ALSA: BufferSize::Default to use the device defaults.
  • ALSA: Card enumeration to work like aplay -L does.
  • ALSA: Update alsa to 0.10.
  • ALSA: Pass silent=true to PCM.try_recover, so it doesn't write to stderr.
  • ALSA: Report buffer underruns/overruns via StreamError::BufferUnderrun.
  • ASIO: Share sys::Asio instance across all Host instances.
  • CI: Fix cargo publish to trigger on GitHub releases instead of every master commit.
  • CI: Replace cargo install commands with cached tool installation for faster builds.
  • CI: Update actions to latest versions (checkout@v5, rust-cache@v2).
  • CI: Verify compatibility with windows crates since v0.59.
  • CI: Test platforms on appropriate MSRV per backend.
  • CI: Fix cargo update syntax for compatibility with Cargo 1.70 (use -p flag instead of positional argument).
  • CoreAudio: Device::supported_configs to return a single element containing the available sample rate range when all elements have the same mMinimum and mMaximum values.
  • CoreAudio: Default audio device detection to be lazy when building a stream, instead of during device enumeration.
  • CoreAudio: Configure device buffer to ensure predictable callback buffer sizes.
  • CoreAudio: Remove Clone implementation from Stream.
  • JACK: Use StreamError::StreamInvalidated for JACK server sample rate changes.
  • JACK: Report buffer underruns/overruns via StreamError::BufferUnderrun.
  • WASAPI: Update windows to >= 0.59, <= 0.62.

Fixed

  • ALSA: Format selection to probe hardware endianness instead of assuming native byte order.
  • ALSA: Data race in stream shutdown.
  • ASIO: Handling for kAsioResetRequest message to prevent driver UI becoming unresponsive.
  • ASIO: Buffer silencing logic to work with non-conformant drivers (e.g., FL Studio ASIO).
  • CoreAudio: Timestamp accuracy.
  • CoreAudio: Segfaults when enumerating devices.
  • CoreAudio: Undefined behavior related to null pointers and aligned reads.
  • CoreAudio: Unnecessary microphone permission requests when using output devices only.
  • iOS: Example by properly activating audio session.

Removed

  • WebAudio: Optional wee-alloc feature for security reasons.

0.16.0 - 2025-06-07

Added

  • Optional supports_input/output methods to DeviceTrait.
  • 384000Hz to COMMON_SAMPLE_RATES.
  • Constructors for InputCallbackInfo, OutputCallbackInfo and StreamInstant.
  • Default impl for Host.
  • PartialOrd, Ord and Hash implementations for SampleFormat.
  • Clone, PartialEq, Eq and Hash implementations for all error enums.
  • ASIO: Support for int24.

Changed

  • AAudio: Migrate from oboe to ndk::audio. NOTE: This raises the minimum Android API version to 26 (Android 8/Oreo).
  • AAudio: Improve device names.
  • ALSA: Set realtime priority for stream threads.
  • ALSA: Improved card enumeration.
  • CoreAudio: Update coreaudio-rs dependency to 0.13.
  • JACK: Update jack dependency to 0.13.
  • WASAPI: Set realtime priority for stream threads.

Fixed

  • ALSA: Don't panic when handling invalid stream timestamps.
  • ALSA: Fix infinite loop on broken pipes.
  • ASIO: Fix build failure on Windows.
  • CoreAudio: Fix callback being called after dropping the stream.
  • CoreAudio: Fix non-default audio output.
  • CoreAudio: Fix handling of integer input formats.
  • WASAPI: Fixed memory leak.
  • WASAPI: Remove usage of eval.

0.15.3 - 2024-03-04

Added

  • try_with_sample_rate, a non-panicking variant of with_sample_rate.
  • #[must_use] attribute to struct platform::Stream.
  • Copy implementation to enum SupportedBufferSize and struct SupportedStreamConfigRange.
  • Clone implementation to platform::Device.

Changed

  • AAudio: Update jni dependency to 0.21.
  • AAudio: Update oboe dependency to 0.6.
  • AAudio: Update ndk dependency to 0.8 and disable default-features.
  • ALSA: Update alsa dependency to 0.9.
  • CI: Update actions, use Android 30 API level in CI, remove asmjs-unknown-emscripten target.
  • Examples: Migrate wasm example to trunk, improve syth-thones example.
  • WASAPI: Update windows dependency to v0.54.
  • WebAudio: Update wasm-bindgen to 0.2.89.

Fixed

  • WebAudio: Crash on web/wasm when atomics flag is enabled.

Removed

  • parking_lot dependency in favor of the std library.

0.15.2 - 2023-03-30

Added

  • WebAudio: Support for multichannel output streams.

Changed

  • WASAPI: Update windows dependency.

Fixed

  • WASAPI: Fix some thread panics.

0.15.1 - 2023-03-14

Added

  • AAudio: Feature oboe-shared-stdcxx to enable shared-stdcxx on oboe for Android support.

Changed

  • CoreAudio: Switch mach dependency to mach2.

Removed

  • thiserror dependency.

0.15.0 - 2023-01-29

Added

  • CoreAudio: Disconnection detection on Mac OS.

Changed

  • Switch to the dasp_sample crate for the sample trait.
  • Adopt edition 2021.
  • AAudio: Update oboe dependency.
  • AAudio: Update alsa dependency.
  • CoreAudio: Update coreaudio-sys dependency.
  • Emscripten: Switch to web-sys on the emscripten target.
  • JACK: Update jack dependency.
  • WASAPI: Update windows-rs dependency.

0.14.2 - 2022-12-02

Removed

  • nix dependency.

0.14.1 - 2022-10-23

Added

  • ALSA: Support for the 0.6.1 release of alsa-rs.
  • NetBSD: Platform support.

Changed

  • CI: Various improvements.

Fixed

  • ASIO: Feature broken in 0.14.0.

0.14.0 - 2022-08-22

Changed

  • Update parking_lot and once_cell dependencies.
  • AAudio: Turn ndk-glue into a dev-dependency and use ndk-context instead.
  • AAudio: Update ndk and ndk-glue dependencies.
  • JACK: Update jack dependency.
  • WASAPI: Switch to windows-rs crate.

0.13.5 - 2022-01-28

Changed

  • Faster sample format conversion.
  • AAudio: Update ndk, oboe, and ndk-glue dependencies.
  • ALSA: Update alsa and nix dependencies.
  • JACK: Update jack dependency.

0.13.4 - 2021-08-08

Changed

  • AAudio: Update jni dependency.
  • ALSA: Improve stream setup parameters.
  • CoreAudio: Update core-foundation-sys dependency.
  • JACK: Update rust-jack dependency.
  • WASAPI: Allow both threading models and switch the default to STA.

0.13.3 - 2021-03-29

Added

  • Give each thread a unique name.

Fixed

  • ALSA: Fix distortion regression on some configs.

0.13.2 - 2021-03-16

Changed

  • AAudio: Update ndk, nix, oboe, and jni dependencies.

0.13.1 - 2020-11-08

Changed

  • Update parking_lot dependency.

Fixed

  • WASAPI: Don't panic when device is plugged out on Windows.

0.13.0 - 2020-10-28

Added

  • AAudio: Android support via oboe-rs.
  • CI: Android APK build and CI job.

0.12.1 - 2020-07-23

Fixed

  • ASIO: Bugfix release to get the asio feature working again.

0.12.0 - 2020-07-09

Added

  • build_input/output_stream_raw methods allowing for dynamically handling sample format type.
  • InputCallbackInfo and OutputCallbackInfo types and update expected user data callback function signature to provide these.
  • DragonFly BSD: Platform support.

Changed

  • Large refactor removing the blocking EventLoop API.
  • Rename many Format types to StreamConfig:
    • Format type's data_type field renamed to sample_format.
    • Shape -> StreamConfig - The configuration input required to build a stream.
    • Format -> SupportedStreamConfig - Describes a single supported stream configuration.
    • SupportedFormat -> SupportedStreamConfigRange - Describes a range of supported configurations.
    • Device::default_input/output_format -> Device::default_input/output_config.
    • Device::supported_input/output_formats -> Device::supported_input/output_configs.
    • Device::SupportedInput/OutputFormats -> Device::SupportedInput/OutputConfigs.
    • SupportedFormatsError -> SupportedStreamConfigsError.
    • DefaultFormatError -> DefaultStreamConfigError.
    • BuildStreamError::FormatNotSupported -> BuildStreamError::StreamConfigNotSupported.
  • WASAPI: Address deprecated use of mem::uninitialized.

Removed

  • UnknownTypeBuffer in favour of specifying sample type.

0.11.0 - 2019-12-11

Added

  • Name to HostId.
  • WASAPI: winbase winapi feature to solve windows compile error issues.

Changed

  • Remove many uses of std::mem::uninitialized.
  • Panic on stream ID overflow rather than returning an error.
  • Move errors into a separate module.
  • Switch from failure to thiserror for error handling.
  • ALSA: Use snd_pcm_hw_params_set_buffer_time_near rather than set_buffer_time_max.
  • CI: Lots of improvements.
  • Examples: Use ringbuffer crate in feedback example.

Fixed

  • ALSA: Fix some underruns that could occur.
  • WASAPI: Fix capture logic.

0.10.0 - 2019-07-05

Added

  • New Host API, adding support for alternative audio APIs.
  • StreamEvent type to allow users to handle stream callback errors.
  • ASIO: ASIO host, available under Windows.

Changed

  • Remove sleep loop on macOS in favour of using a Condvar.
  • Overhaul error handling throughout the crate.
  • Remove panic! from OutputBuffer Deref impl as it is no longer necessary.
  • ALSA: Remove unnecessary Mutex in favour of channels.
  • CoreAudio: Update core-foundation-sys and coreaudio-rs dependencies.
  • WASAPI: Remove unnecessary Mutex in favour of channels.

0.9.0 - 2019-06-06

Added

  • ALSA: Error handling for unknown device errors.
  • Emscripten: default_output_format implementation.

Changed

  • Better buffer handling.

Fixed

  • Logic error in frame/sample size.
  • WASAPI: Fix resuming a paused stream.

0.8.2 - 2018-07-03

Added

  • Display and Error implementations for DefaultFormatError.

Changed

  • Upgrade lazy_static dependency.

0.8.1 - 2018-04-01

Fixed

  • CoreAudio: Handling of non-default sample rates for input streams.

0.8.0 - 2018-02-15

Added

  • Device::supported_{input/output}_formats methods.
  • Device::default_{input/output}_format methods.
  • default_{input/output}_device functions.
  • StreamData type for handling either input or output streams in EventLoop::run callback.
  • ALSA: Input stream support.
  • CoreAudio: Input stream support.
  • Examples: record_wav.rs example that records 3 seconds to $CARGO_MANIFEST_DIR/recorded.wav using default input device.
  • WASAPI: Input stream support.

Changed

  • Replace usage of Voice with Stream throughout the crate.
  • Examples: Update enumerate.rs example to display default input/output devices and formats.

Removed

  • Endpoint in favour of Device for supporting both input and output streams.

0.7.0 - 2018-02-04

Added

  • CoreAudio: Endpoint and Format enumeration for macOS.
  • CoreAudio: Format handling for build_voice method.

Changed

  • Rename ChannelsCount to ChannelCount.
  • Rename SamplesRate to SampleRate.
  • Rename the min_samples_rate field of SupportedFormat to min_sample_rate.
  • Rename the with_max_samples_rate() method of SupportedFormat to with_max_sample_rate().
  • Rename the samples_rate field of Format to sample_rate.
  • Changed the type of the channels field of the SupportedFormat struct from Vec<ChannelPosition> to ChannelCount (an alias to u16).

Removed

  • Unused ChannelPosition API.

0.6.0 - 2017-12-11

Added

  • Improvements to the crate documentation.
  • ALSA: pause and play support.

Changed

  • CoreAudio: Reduced the number of allocations.
  • Emscripten: Backend to consume less CPU.

Fixed

  • CoreAudio: Fixes for macOS build (#186, #189).

0.5.1 - 2017-10-21

Added

  • Sample::to_i16(), Sample::to_u16() and Sample::from methods.

0.5.0 - 2017-10-21

Added

  • EventLoop::build_voice, EventLoop::destroy_voice, EventLoop::play, and EventLoop::pause methods.
  • VoiceId struct that is now used to identify a voice owned by an EventLoop.

Changed

  • EventLoop::run() to take a callback that is called whenever a voice requires sound data.
  • supported_formats() to produce a list of SupportedFormat instead of Format. A SupportedFormat must then be turned into a Format in order to build a voice.

Removed

  • Dependency on the futures library.
  • Voice and SamplesStream types.

0.4.6 - 2017-10-11

Added

  • iOS: Minimal support.

Changed

  • Run rustfmt on the code.

Fixed

  • BSD: Fixes for *BSDs.

Removed

  • get_ prefix of methods.

0.4.5 - 2017-04-29

Changed

  • Simplify the Cargo.toml.
  • ALSA: Bump alsa-sys version number.
  • ALSA: Mark alsa-sys as linking to alsa.

Fixed

  • CoreAudio: SampleStream also holds on to the AudioUnit so it is not dropped.
  • CoreAudio: Fix for loop in EventLoop::run being optimised out in a release build on macOS.

Removed

  • Stop publishing on gh-pages.

0.4.4 - 2017-02-04

Fixed

  • ALSA: Pass period instead of buffer to snd_pcm_sw_params_set_avail_min.

0.4.3 - 2017-02-01

Fixed

  • ALSA: Set sw_params_set_avail_min based on get_params buffer size.

0.4.2 - 2017-01-19

Added

  • CoreAudio: coreaudio-rs dependency for i686-apple-darwin.

Deprecated

  • Mark deprecated functions as deprecated.

0.4.1 - 2016-11-16

Added

  • ALSA: Implement play and pause.
  • CoreAudio: Implement play/pause.

Fixed

  • WASAPI: Fix compilation on windows.

0.4.0 - 2016-10-01

Changed

  • ALSA: Update to futures 0.1.1.
  • WASAPI: Update to futures 0.1.1.

Fixed

  • CoreAudio: Do not lock inner twice. Fixes bug in osx futures 0.1.1 update.
  • CoreAudio: Try fix the OSX code with futures.

0.3.1 - 2016-08-20

Added

  • WASAPI: Some documentation to the winapi implementation.

Changed

  • ALSA: Bump alsa-sys to 0.1.

Fixed

  • Fix #126.
  • Fix most warnings.

0.3.0 - 2016-08-12

Added

  • CoreAudio: Update backend to new futures-rs oriented design.

Changed

  • Update documentation.
  • Use a max buffer size in order to avoid problems.
  • Update deps.
  • ALSA: Make it work on Linux.
  • Null: Update the null implementation.

0.2.12 - 2016-07-10

Added

  • CoreAudio: Add get_period to Voice.

Changed

  • CoreAudio: Update to coreaudio-rs 0.5.0.

Fixed

  • CoreAudio: Correct implementation of get_pending_samples.
  • CoreAudio: Return correct Voice period.

0.2.11 - 2016-04-25

Fixed

  • Be more relaxed with c_void.

0.2.10 - 2016-04-22

Added

  • ALSA: Add pollfd.

Fixed

  • ALSA: Fix underflow detection.
  • Android: Fix the android build.
  • Android: Add ARM target.

0.2.9 - 2016-01-28

Added

  • CoreAudio: Add support for U16/I16 PCM formats.
  • CoreAudio: Implement some missing functions.

Changed

  • Handle channels positionning.
  • Update Cargo.toml after the previous changes.
  • Allow for building for mipsel targets.
  • ALSA: Use correct ALSA channels.
  • CoreAudio: Implementation cleanup.
  • CoreAudio: Make Voice Send/Sync.
  • CoreAudio: Set sample rate to 44100.
  • Examples: Update the beep example.

Fixed

  • ALSA: Fix underflow bug on linux.
  • CI: Fix for travis build.
  • CoreAudio: Fix compilation on OSX with the new API for coreaudio-rs.
  • CoreAudio: Return correct length of buffer, stub unimpl funcs.
  • CoreAudio: Restore CoreAudio support after API overhaul.
  • Examples: Add some sane error messages.
  • Examples: Improve error reporting in beep example.

Removed

  • Do not use a wildcard version number.
  • CoreAudio: Revert "Add support for U16/I16 PCM formats" (was causing issues).

0.2.8 - 2015-11-10

Changed

  • Libc 0.2.
  • WASAPI: Update winapi.

Fixed

  • WASAPI: Catch another 'device not found' error code.

0.2.7 - 2015-09-27

Added

  • Voice::get_period() method.

0.2.6 - 2015-09-22

Fixed

  • ALSA: Make sure that all writes succeed.
  • ALSA: Make the implementation more robust by recovering from underruns.

0.2.5 - 2015-09-22

Added

  • Voice::get_pending_samples method.

0.2.4 - 2015-09-22

Added

  • endpoint::get_name() method.
  • Examples: An enumerate example.
  • WASAPI: Device name support.

Changed

  • ALSA: Correctly enumerate supported formats.

Fixed

  • ALSA: Various fixes.
  • ALSA: Use the correct format.
  • ALSA: Use the correct device name when enumerating formats.
  • WASAPI: Fix bug and filter out devices that are not "Output".

0.2.3 - 2015-09-22

Added

  • #[inline] attributes.
  • underflow() method to Voice.

Changed

  • Store the format in the public Voice struct.
  • WASAPI: General cleanup.
  • WASAPI: Update winapi dependency.

Fixed

  • WASAPI: Fix the hack in the implementation.

Removed

  • Unused extern crate libc.

0.2.2 - 2015-09-11

Added

  • UnknownBufferType::len() method.

Fixed

  • Null: Restore the null implementation and compile it every time.

0.2.1 - 2015-09-10

Changed

  • Handle channels positionning.
  • Update Cargo.toml after the previous changes.
  • Examples: Update the beep example.

Fixed

  • ALSA: Fix compilation.

0.2.0 - 2015-09-01

Added

  • Proper error handling.
  • Supported formats enumeration.
  • endpoint::get_name() method.

Changed

  • ALSA: Make it compile again.
  • WASAPI: Enable 32bits samples.
  • WASAPI: Better error handling in format detection.
  • WASAPI: Now decoding the format from the WAVEFORMAT returned by the winapi.
  • WASAPI: Handle F32 formats in Voice::new.
  • WASAPI: Use the format passed as parameter in Voice::new.
  • WASAPI: Correctly enumerate audio devices (core + wasapi).

Fixed

  • Fix doctests.
  • Add more detailed message to panic.

Removed

  • Conversion system.
  • Use of box syntax.

0.1.2 - 2015-07-22

Fixed

  • ALSA: Correct reported sample format.
  • WASAPI: Fix samples signs on win32.

0.1.1 - 2015-07-20

Fixed

  • Fix the version in the README.
  • WASAPI: Fix the win32 build.

0.1.0 - 2015-07-11

Added

  • Bump to 0.1.0.

0.0.23 - 2015-07-04

Fixed

  • WASAPI: Fix platform-specific dependencies with MSVC.

0.0.22 - 2015-06-24

Fixed

  • ALSA: Calls to a single ALSA channel are not thread safe.

0.0.21 - 2015-06-05

Changed

  • Examples: Simplify beep example.
  • WASAPI: Use shiny new COM.

0.0.20 - 2015-04-20

Changed

  • Rustup and version bumps.
  • ALSA: Remove integer suffixes in alsa-sys.

0.0.19 - 2015-04-04

Changed

  • Update for Rustc 1.0.0 beta.

0.0.18 - 2015-03-30

Changed

  • Update for change in rustc and winapi.

0.0.17 - 2015-03-26

Changed

  • Rustup.
  • ALSA: Publish alsa-sys before cpal.

0.0.16 - 2015-03-25

Added

  • CoreAudio: OSX support via the Apple Core Audio, Audio Unit C API. Only supports f32 so far.
  • CoreAudio: Coreaudio bindings.

Changed

  • Rustup.

Fixed

  • CI: Fix travis build.
  • CoreAudio: Fixed callback to send proper buffersize, removed code in lib where sampleformat affected buffersize.
  • CoreAudio: Properly shutdown the AudioUnit on drop.

Removed

  • CoreAudio: Removed core_audio-sys local bindings in favour of new coreaudio-rs crate.

0.0.15 - 2015-02-22

Changed

  • Bump version.
  • Update for rustc.

0.0.14 - 2015-02-19

Changed

  • Update for rustc.
  • ALSA: Bump alsa-sys version.
  • ALSA: Clean up alsa-sys.
  • CI: Automatically publish on crates.io on successful builds.
  • CI: Publish alsa-sys too.

0.0.13 - 2015-02-12

Changed

  • Update with libc version.

0.0.12 - 2015-01-29

Changed

  • Bump version number.

0.0.11 - 2015-01-29

Changed

  • Update for rustc.

0.0.10 - 2015-01-20

Added

  • Null: "null" implementation for platforms that aren't supported.

Changed

  • Changed integer suffix from 'u' to 'us'.
  • Bump version number (multiple times).
  • Update for rust-1.0 alpha.
  • WASAPI: Update for winapi.

0.0.8 - 2015-01-08

Changed

  • Bump version number.
  • Update for Rustc.

0.0.7 - 2015-01-05

Changed

  • Update for rustc.

0.0.6 - 2014-12-30

Added

  • #[must_use] marker for Buffer.

Changed

  • Bump version number.
  • Update for changes in rustc.

0.0.5 - 2014-12-23

Added

  • play() and pause() functions.
  • Implement f32 to i16 and f32 to u16 conversions.
  • Tests for convert_samples_rate.
  • Tests for convert_channels.

Changed

  • Cleanup convert_samples_rate.
  • Cleanup convert_channels.

Fixed

  • CI: Fix the appveyor build.

0.0.4 - 2014-12-20

Changed

  • Update for rustc.

0.0.3 - 2014-12-17

Added

  • Link to documentation.
  • Some documentation.
  • Fixes and tests for samples conversions.
  • All samples formats.
  • Samples formats conversions.
  • CI: Automatic gh-pages deployment in travis.

Changed

  • Bump version number.
  • Improve documentation.
  • Use Cow for formats conversions to avoid an allocation and copy.

Fixed

  • Minor README update.
  • CI: Remove old section from travis.yml.
  • CI: Fix travis.yml.

Removed

  • Rename Channel to Voice.

0.0.2 - 2014-12-17

Added

  • Basic API.
  • Some documentation.
  • Keywords.
  • Some formats-related functions.
  • Some basic data conversion.
  • Some samples rate conversions.
  • Variable input format system.
  • Samples iterator.
  • ALSA: Basic implementation.
  • ALSA: alsa-sys library.
  • CI: Appveyor file.
  • CI: Config for rust-ci in travis.
  • Examples: Draft for example music playing.
  • Examples: Semi-working WASAPI example.
  • WASAPI: Destructor for wasapi::Channel.

Changed

  • Bump version number.
  • Buffer now always has the u8 format.
  • Modify API to use a "samples" iterator.
  • Change player architecture to avoid data losses.
  • Minor nitpicking.
  • Update for rustc.
  • ALSA: Use the official winapi crate.
  • ALSA: More tweaks for alsa-sys.
  • ALSA: Minor tweaks in Cargo.toml files.
  • Examples: Replace example by a smaller one.
  • Examples: Replace example by a sinusoid generator.
  • Examples: Rename example to "beep".

Fixed

  • Fix warnings.
  • Fix PCM formats conversions not working.
  • Fix issue when calling buffer.samples() multiple times with the same buffer.
  • Sound output now works correctly.
  • Minor fixes.
  • WASAPI: Revert "Switch to retep998/winapi".

Removed

  • Switch back to using buffers.
  • Remove old code.

0.0.1 - 2014-12-11

Added

  • Initial commit.
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# Changelog

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

- `DeviceBusy` error variant to `SupportedStreamConfigsError`, `DefaultStreamConfigError`, and
  `BuildStreamError` for retryable device access errors (EBUSY, EAGAIN).
- `StreamConfig` now implements `Copy`.
- `StreamTrait::buffer_size()` to query the stream's current buffer size in frames per callback.
- `device_by_id` is now dispatched to each backend's implementation, allowing to override it.
- **ALSA**: `device_by_id` now accepts PCM shorthand names such as `hw:0,0` and `plughw:foo`.
- **PipeWire**: New host for Linux and some BSDs using the PipeWire API.
- **PulseAudio**: New host for Linux and some BSDs using the PulseAudio API.

### Changed

- Public error enums are now marked `#[non_exhaustive]` to allow adding variants without
  SemVer-breaking changes.
- `DeviceTrait::build_*_stream` now takes `StreamConfig` by value instead of `&StreamConfig`
- **AAudio**: Device names now include the device type suffix (e.g. "Speaker (Builtin Speaker)")
  for easier identification when enumerating devices.
- **AAudio**: `supported_input_configs` and `supported_output_configs` now return an error for
  direction-mismatched devices (e.g. querying input configs on an output-only device) instead of
  silently returning an empty list.
- **AAudio**: Bump MSRV to 1.85.
- **AAudio**: Buffers with default sizes are now dynamically tuned.
- **ALSA**: Device disconnection now stops the stream with `StreamError::DeviceNotAvailable` instead of looping.
- **ALSA**: Polling errors trigger underrun recovery instead of looping.
- **ALSA**: Try to resume from hardware after a system suspend.
- **ALSA**: Loop partial reads and writes to completion.
- **ALSA**: Prevent reentrancy issues with non-reentrant plugins and devices.
- **ASIO**: `Device::driver`, `asio_streams`, and `current_callback_flag` are no longer `pub`.
- **ASIO**: Timestamps now include driver-reported hardware latency.
- **ASIO**: Hardware latency is now re-queried when the driver reports `kAsioLatenciesChanged`.
- **ASIO**: Stream error callback now receives `StreamError::BufferUnderrun` on `kAsioResyncRequest`.
- **ASIO**: Stream error callback now receives `StreamError::StreamInvalidated` when the driver reports a sample rate change (`sampleRateDidChange`) of 1 Hz or more from the configured rate.
- **CoreAudio**: Timestamps now include device latency and safety offset.
- **JACK**: Timestamps now use the precise hardware deadline.
- **Linux/BSD**: Default host in order from first to last available now is: PipeWire, PulseAudio, ALSA.
- **WASAPI**: Timestamps now include hardware pipeline latency.
- **WebAudio**: Bump MSRV to 1.85.
- **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.
- **ALSA**: Fix spurious timeout errors during polling.
- **ALSA**: Fix rare panics when dropping the stream is interrupted.
- **ALSA**: Fix timestamp overflows on 32-bit platforms.
- **ASIO**: Fix enumeration returning only the first device when using `collect`.
- **ASIO**: Fix device enumeration and stream creation failing when called from spawned threads.
- **ASIO**: Fix buffer size not resizing when the driver reports `kAsioBufferSizeChange`.
- **ASIO**: Fix latency not updating when the driver reports `kAsioLatenciesChanged`.
- **ASIO**: Fix distortion when buggy drivers fire the buffer callback multiple times per cycle.
- **CoreAudio**: Fix undefined behaviour and silent failure in loopback device creation.
- **Emscripten**: Fix build failure introduced by newer `wasm-bindgen` versions.
- **JACK**: Fix input capture timestamp using callback execution time instead of cycle start.

## [0.17.3] - 2026-02-18

### Changed

- Reverted SemVer-breaking `DeviceBusy` error variant addition.

### Fixed

- **ASIO**: Fix linker errors.

## [0.17.2] - 2026-02-08 [YANKED]

### Added

- `DeviceBusy` error variant for retriable device access errors (EBUSY, EAGAIN).
- **ALSA**: `Debug` implementations for `Host`, `Device`, `Stream`, and internal types.
- **ALSA**: Example demonstrating ALSA error suppression during enumeration.
- **ALSA**: Support for native DSD playback.
- **WASAPI**: Enable as-necessary resampling in the WASAPI server process.

### Changed

- Bump overall MSRV to 1.78.
- **ALSA**: Update `alsa` dependency to 0.11.
- **ALSA**: Bump MSRV to 1.82.
- **CoreAudio**: Update `core-audio-rs` dependency to 0.14.

### Fixed

- **ALSA**: Enumerating input and output devices no longer interferes with each other.
- **ALSA**: Device handles are no longer exclusively held between operations.
- **ALSA**: Reduce Valgrind memory leak reports from ALSA global configuration cache.
- **ALSA**: Fix possible race condition on drop.
- **ALSA**: Fix audio callback stalling when start threshold is not met.

## [0.17.1] - 2026-01-04

### Added

- **ALSA**: `Default` implementation for `Device` (returns the ALSA "default" device).
- **CI**: Checks default/no-default/all feature sets with platform-dependent MSRV for JACK.

### Changed

- **ALSA**: Devices now report direction from hint metadata and physical hardware probing.

### Fixed

- **ALSA**: Device enumeration now includes both hints and physical cards.
- **JACK**: No longer builds on iOS.
- **WASM**: WasmBindgen no longer crashes (regression from 0.17.0).

## [0.17.0] - 2025-12-20

### Added

- `DeviceTrait::id` method that returns a stable audio device ID.
- `HostTrait::device_by_id` to select a device by its stable ID.
- `Display` and `FromStr` implementations for `HostId`.
- Support for custom `Host`s, `Device`s, and `Stream`s.
- `Sample::bits_per_sample` method.
- `Copy` implementation to `InputCallbackInfo` and `OutputCallbackInfo`.
- `StreamError::StreamInvalidated` variant for when stream must be rebuilt.
- `StreamError::BufferUnderrun` variant for buffer underrun/overrun notifications.
- `Hash` implementation to `Device` for all backends.
- **AAudio**: `Send` and `Sync` implementations to `Stream`.
- **AAudio**: Support for 12 and 24 kHz sample rates.
- **ALSA**: `I24` and `U24` sample format support (24-bit samples stored in 4 bytes).
- **ALSA**: Support for 12, 24, 352.8, 384, 705.6, and 768 kHz sample rates.
- **ALSA**: `Eq` and `PartialEq` implementations to `Device`.
- **CI**: Native ARM64 Linux support in GitHub Actions.
- **CoreAudio**: `i8`, `i32` and `I24` sample format support (24-bit samples stored in 4 bytes).
- **CoreAudio**: Support for loopback recording (recording system audio output) on macOS > 14.6.
- **CoreAudio**: `Send` implementation to `Stream`.
- **Emscripten**: `BufferSize::Fixed` validation against supported range.
- **iOS**: Complete AVAudioSession integration for device enumeration and buffer size control.
- **JACK**: Support for macOS and Windows platforms.
- **JACK**: `BufferSize::Fixed` validation to reject requests that don't match server buffer size.
- **WASAPI**: Expose `IMMDevice` from WASAPI host Device.
- **WASAPI**: `I24` and `U24` sample format support (24-bit samples stored in 4 bytes).
- **WASAPI**: `Send` and `Sync` implementations to `Stream`.
- **WebAudio**: `Send` and `Sync` implementations to `Stream`.
- **WebAudio**: `BufferSize::Fixed` validation against supported range.

### Changed

- MSRV depends on the platform and at minimum 1.77.
- Set examples to Rust 2021.
- `SampleRate` from struct to `u32` type alias.
- Update `audio_thread_priority` to 0.34.
- Migrate CHANGELOG to [Keep a Changelog](https://keepachangelog.com/en/1.1.0/) format.
- **AAudio**: Configure buffer to ensure consistent callback buffer sizes.
- **AAudio**: Buffer size range detection to query the AudioService property correctly.
- **ALSA**: Improve `BufferSize::Fixed` precision and audio callback performance.
- **ALSA**: `BufferSize::Default` to use the device defaults.
- **ALSA**: Card enumeration to work like `aplay -L` does.
- **ALSA**: Update `alsa` to 0.10.
- **ALSA**: Pass `silent=true` to `PCM.try_recover`, so it doesn't write to stderr.
- **ALSA**: Report buffer underruns/overruns via `StreamError::BufferUnderrun`.
- **ASIO**: Share `sys::Asio` instance across all `Host` instances.
- **CI**: Fix cargo publish to trigger on GitHub releases instead of every master commit.
- **CI**: Replace cargo install commands with cached tool installation for faster builds.
- **CI**: Update actions to latest versions (checkout@v5, rust-cache@v2).
- **CI**: Verify compatibility with windows crates since v0.59.
- **CI**: Test platforms on appropriate MSRV per backend.
- **CI**: Fix `cargo update` syntax for compatibility with Cargo 1.70 (use `-p` flag instead of positional argument).
- **CoreAudio**: `Device::supported_configs` to return a single element containing the available sample rate range when all elements have the same `mMinimum` and `mMaximum` values.
- **CoreAudio**: Default audio device detection to be lazy when building a stream, instead of during device enumeration.
- **CoreAudio**: Configure device buffer to ensure predictable callback buffer sizes.
- **CoreAudio**: Remove `Clone` implementation from `Stream`.
- **JACK**: Use `StreamError::StreamInvalidated` for JACK server sample rate changes.
- **JACK**: Report buffer underruns/overruns via `StreamError::BufferUnderrun`.
- **WASAPI**: Update `windows` to >= 0.59, <= 0.62.

### Fixed

- **ALSA**: Format selection to probe hardware endianness instead of assuming native byte order.
- **ALSA**: Data race in stream shutdown.
- **ASIO**: Handling for `kAsioResetRequest` message to prevent driver UI becoming unresponsive.
- **ASIO**: Buffer silencing logic to work with non-conformant drivers (e.g., FL Studio ASIO).
- **CoreAudio**: Timestamp accuracy.
- **CoreAudio**: Segfaults when enumerating devices.
- **CoreAudio**: Undefined behavior related to null pointers and aligned reads.
- **CoreAudio**: Unnecessary microphone permission requests when using output devices only.
- **iOS**: Example by properly activating audio session.

### Removed

- **WebAudio**: Optional `wee-alloc` feature for security reasons.

## [0.16.0] - 2025-06-07

### Added

- Optional `supports_input`/`output` methods to `DeviceTrait`.
- 384000Hz to `COMMON_SAMPLE_RATES`.
- Constructors for `InputCallbackInfo`, `OutputCallbackInfo` and `StreamInstant`.
- `Default` impl for `Host`.
- `PartialOrd`, `Ord` and `Hash` implementations for `SampleFormat`.
- `Clone`, `PartialEq`, `Eq` and `Hash` implementations for all error enums.
- **ASIO**: Support for int24.

### Changed

- **AAudio**: Migrate from `oboe` to `ndk::audio`. **NOTE:** This raises the minimum Android API version to 26 (Android 8/Oreo).
- **AAudio**: Improve device names.
- **ALSA**: Set realtime priority for stream threads.
- **ALSA**: Improved card enumeration.
- **CoreAudio**: Update `coreaudio-rs` dependency to 0.13.
- **JACK**: Update `jack` dependency to 0.13.
- **WASAPI**: Set realtime priority for stream threads.

### Fixed

- **ALSA**: Don't panic when handling invalid stream timestamps.
- **ALSA**: Fix infinite loop on broken pipes.
- **ASIO**: Fix build failure on Windows.
- **CoreAudio**: Fix callback being called after dropping the stream.
- **CoreAudio**: Fix non-default audio output.
- **CoreAudio**: Fix handling of integer input formats.
- **WASAPI**: Fixed memory leak.
- **WASAPI**: Remove usage of `eval`.

## [0.15.3] - 2024-03-04

### Added

- `try_with_sample_rate`, a non-panicking variant of `with_sample_rate`.
- `#[must_use]` attribute to struct `platform::Stream`.
- `Copy` implementation to enum `SupportedBufferSize` and struct `SupportedStreamConfigRange`.
- `Clone` implementation to `platform::Device`.

### Changed

- **AAudio**: Update `jni` dependency to 0.21.
- **AAudio**: Update `oboe` dependency to 0.6.
- **AAudio**: Update `ndk` dependency to 0.8 and disable `default-features`.
- **ALSA**: Update `alsa` dependency to 0.9.
- **CI**: Update actions, use Android 30 API level in CI, remove `asmjs-unknown-emscripten` target.
- **Examples**: Migrate wasm example to `trunk`, improve syth-thones example.
- **WASAPI**: Update `windows` dependency to v0.54.
- **WebAudio**: Update `wasm-bindgen` to 0.2.89.

### Fixed

- **WebAudio**: Crash on web/wasm when `atomics` flag is enabled.

### Removed

- `parking_lot` dependency in favor of the std library.

## [0.15.2] - 2023-03-30

### Added

- **WebAudio**: Support for multichannel output streams.

### Changed

- **WASAPI**: Update `windows` dependency.

### Fixed

- **WASAPI**: Fix some thread panics.

## [0.15.1] - 2023-03-14

### Added

- **AAudio**: Feature `oboe-shared-stdcxx` to enable `shared-stdcxx` on `oboe` for Android support.

### Changed

- **CoreAudio**: Switch `mach` dependency to `mach2`.

### Removed

- `thiserror` dependency.

## [0.15.0] - 2023-01-29

### Added

- **CoreAudio**: Disconnection detection on Mac OS.

### Changed

- Switch to the `dasp_sample` crate for the sample trait.
- Adopt edition 2021.
- **AAudio**: Update `oboe` dependency.
- **AAudio**: Update `alsa` dependency.
- **CoreAudio**: Update `coreaudio-sys` dependency.
- **Emscripten**: Switch to `web-sys` on the emscripten target.
- **JACK**: Update `jack` dependency.
- **WASAPI**: Update `windows-rs` dependency.

## [0.14.2] - 2022-12-02

### Removed

- `nix` dependency.

## [0.14.1] - 2022-10-23

### Added

- **ALSA**: Support for the 0.6.1 release of `alsa-rs`.
- **NetBSD**: Platform support.

### Changed

- **CI**: Various improvements.

### Fixed

- **ASIO**: Feature broken in 0.14.0.

## [0.14.0] - 2022-08-22

### Changed

- Update `parking_lot` and `once_cell` dependencies.
- **AAudio**: Turn `ndk-glue` into a dev-dependency and use `ndk-context` instead.
- **AAudio**: Update `ndk` and `ndk-glue` dependencies.
- **JACK**: Update `jack` dependency.
- **WASAPI**: Switch to `windows-rs` crate.

## [0.13.5] - 2022-01-28

### Changed

- Faster sample format conversion.
- **AAudio**: Update `ndk`, `oboe`, and `ndk-glue` dependencies.
- **ALSA**: Update `alsa` and `nix` dependencies.
- **JACK**: Update `jack` dependency.

## [0.13.4] - 2021-08-08

### Changed

- **AAudio**: Update `jni` dependency.
- **ALSA**: Improve stream setup parameters.
- **CoreAudio**: Update `core-foundation-sys` dependency.
- **JACK**: Update `rust-jack` dependency.
- **WASAPI**: Allow both threading models and switch the default to STA.

## [0.13.3] - 2021-03-29

### Added

- Give each thread a unique name.

### Fixed

- **ALSA**: Fix distortion regression on some configs.

## [0.13.2] - 2021-03-16

### Changed

- **AAudio**: Update `ndk`, `nix`, `oboe`, and `jni` dependencies.

## [0.13.1] - 2020-11-08

### Changed

- Update `parking_lot` dependency.

### Fixed

- **WASAPI**: Don't panic when device is plugged out on Windows.

## [0.13.0] - 2020-10-28

### Added

- **AAudio**: Android support via `oboe-rs`.
- **CI**: Android APK build and CI job.

## [0.12.1] - 2020-07-23

### Fixed

- **ASIO**: Bugfix release to get the asio feature working again.

## [0.12.0] - 2020-07-09

### Added

- `build_input/output_stream_raw` methods allowing for dynamically handling sample format type.
- `InputCallbackInfo` and `OutputCallbackInfo` types and update expected user data callback function signature to provide these.
- **DragonFly BSD**: Platform support.

### Changed

- Large refactor removing the blocking EventLoop API.
- Rename many `Format` types to `StreamConfig`:
  - `Format` type's `data_type` field renamed to `sample_format`.
  - `Shape` -> `StreamConfig` - The configuration input required to build a stream.
  - `Format` -> `SupportedStreamConfig` - Describes a single supported stream configuration.
  - `SupportedFormat` -> `SupportedStreamConfigRange` - Describes a range of supported configurations.
  - `Device::default_input/output_format` -> `Device::default_input/output_config`.
  - `Device::supported_input/output_formats` -> `Device::supported_input/output_configs`.
  - `Device::SupportedInput/OutputFormats` -> `Device::SupportedInput/OutputConfigs`.
  - `SupportedFormatsError` -> `SupportedStreamConfigsError`.
  - `DefaultFormatError` -> `DefaultStreamConfigError`.
  - `BuildStreamError::FormatNotSupported` -> `BuildStreamError::StreamConfigNotSupported`.
- **WASAPI**: Address deprecated use of `mem::uninitialized`.

### Removed

- `UnknownTypeBuffer` in favour of specifying sample type.

## [0.11.0] - 2019-12-11

### Added

- Name to `HostId`.
- **WASAPI**: `winbase` winapi feature to solve windows compile error issues.

### Changed

- Remove many uses of `std::mem::uninitialized`.
- Panic on stream ID overflow rather than returning an error.
- Move errors into a separate module.
- Switch from `failure` to `thiserror` for error handling.
- **ALSA**: Use `snd_pcm_hw_params_set_buffer_time_near` rather than `set_buffer_time_max`.
- **CI**: Lots of improvements.
- **Examples**: Use `ringbuffer` crate in feedback example.

### Fixed

- **ALSA**: Fix some underruns that could occur.
- **WASAPI**: Fix capture logic.

## [0.10.0] - 2019-07-05

### Added

- New Host API, adding support for alternative audio APIs.
- `StreamEvent` type to allow users to handle stream callback errors.
- **ASIO**: ASIO host, available under Windows.

### Changed

- Remove sleep loop on macOS in favour of using a `Condvar`.
- Overhaul error handling throughout the crate.
- Remove `panic!` from OutputBuffer Deref impl as it is no longer necessary.
- **ALSA**: Remove unnecessary Mutex in favour of channels.
- **CoreAudio**: Update `core-foundation-sys` and `coreaudio-rs` dependencies.
- **WASAPI**: Remove unnecessary Mutex in favour of channels.

## [0.9.0] - 2019-06-06

### Added

- **ALSA**: Error handling for unknown device errors.
- **Emscripten**: `default_output_format` implementation.

### Changed

- Better buffer handling.

### Fixed

- Logic error in frame/sample size.
- **WASAPI**: Fix resuming a paused stream.

## [0.8.2] - 2018-07-03

### Added

- `Display` and `Error` implementations for `DefaultFormatError`.

### Changed

- Upgrade `lazy_static` dependency.

## [0.8.1] - 2018-04-01

### Fixed

- **CoreAudio**: Handling of non-default sample rates for input streams.

## [0.8.0] - 2018-02-15

### Added

- `Device::supported_{input/output}_formats` methods.
- `Device::default_{input/output}_format` methods.
- `default_{input/output}_device` functions.
- `StreamData` type for handling either input or output streams in `EventLoop::run` callback.
- **ALSA**: Input stream support.
- **CoreAudio**: Input stream support.
- **Examples**: `record_wav.rs` example that records 3 seconds to `$CARGO_MANIFEST_DIR/recorded.wav` using default input device.
- **WASAPI**: Input stream support.

### Changed

- Replace usage of `Voice` with `Stream` throughout the crate.
- **Examples**: Update `enumerate.rs` example to display default input/output devices and formats.

### Removed

- `Endpoint` in favour of `Device` for supporting both input and output streams.

## [0.7.0] - 2018-02-04

### Added

- **CoreAudio**: `Endpoint` and `Format` enumeration for macOS.
- **CoreAudio**: Format handling for `build_voice` method.

### Changed

- Rename `ChannelsCount` to `ChannelCount`.
- Rename `SamplesRate` to `SampleRate`.
- Rename the `min_samples_rate` field of `SupportedFormat` to `min_sample_rate`.
- Rename the `with_max_samples_rate()` method of `SupportedFormat` to `with_max_sample_rate()`.
- Rename the `samples_rate` field of `Format` to `sample_rate`.
- Changed the type of the `channels` field of the `SupportedFormat` struct from `Vec<ChannelPosition>` to `ChannelCount` (an alias to `u16`).

### Removed

- Unused ChannelPosition API.

## [0.6.0] - 2017-12-11

### Added

- Improvements to the crate documentation.
- **ALSA**: `pause` and `play` support.

### Changed

- **CoreAudio**: Reduced the number of allocations.
- **Emscripten**: Backend to consume less CPU.

### Fixed

- **CoreAudio**: Fixes for macOS build (#186, #189).

## [0.5.1] - 2017-10-21

### Added

- `Sample::to_i16()`, `Sample::to_u16()` and `Sample::from` methods.

## [0.5.0] - 2017-10-21

### Added

- `EventLoop::build_voice`, `EventLoop::destroy_voice`, `EventLoop::play`, and `EventLoop::pause` methods.
- `VoiceId` struct that is now used to identify a voice owned by an `EventLoop`.

### Changed

- `EventLoop::run()` to take a callback that is called whenever a voice requires sound data.
- `supported_formats()` to produce a list of `SupportedFormat` instead of `Format`. A `SupportedFormat` must then be turned into a `Format` in order to build a voice.

### Removed

- Dependency on the `futures` library.
- `Voice` and `SamplesStream` types.

## [0.4.6] - 2017-10-11

### Added

- **iOS**: Minimal support.

### Changed

- Run rustfmt on the code.

### Fixed

- **BSD**: Fixes for *BSDs.

### Removed

- `get_` prefix of methods.

## [0.4.5] - 2017-04-29

### Changed

- Simplify the Cargo.toml.
- **ALSA**: Bump alsa-sys version number.
- **ALSA**: Mark alsa-sys as linking to alsa.

### Fixed

- **CoreAudio**: SampleStream also holds on to the AudioUnit so it is not dropped.
- **CoreAudio**: Fix for loop in EventLoop::run being optimised out in a release build on macOS.

### Removed

- Stop publishing on gh-pages.

## [0.4.4] - 2017-02-04

### Fixed

- **ALSA**: Pass period instead of buffer to snd_pcm_sw_params_set_avail_min.

## [0.4.3] - 2017-02-01

### Fixed

- **ALSA**: Set sw_params_set_avail_min based on get_params buffer size.

## [0.4.2] - 2017-01-19

### Added

- **CoreAudio**: coreaudio-rs dependency for i686-apple-darwin.

### Deprecated

- Mark deprecated functions as deprecated.

## [0.4.1] - 2016-11-16

### Added

- **ALSA**: Implement play and pause.
- **CoreAudio**: Implement play/pause.

### Fixed

- **WASAPI**: Fix compilation on windows.

## [0.4.0] - 2016-10-01

### Changed

- **ALSA**: Update to futures 0.1.1.
- **WASAPI**: Update to futures 0.1.1.

### Fixed

- **CoreAudio**: Do not lock inner twice. Fixes bug in osx futures 0.1.1 update.
- **CoreAudio**: Try fix the OSX code with futures.

## [0.3.1] - 2016-08-20

### Added

- **WASAPI**: Some documentation to the winapi implementation.

### Changed

- **ALSA**: Bump alsa-sys to 0.1.

### Fixed

- Fix #126.
- Fix most warnings.

## [0.3.0] - 2016-08-12

### Added

- **CoreAudio**: Update backend to new futures-rs oriented design.

### Changed

- Update documentation.
- Use a max buffer size in order to avoid problems.
- Update deps.
- **ALSA**: Make it work on Linux.
- **Null**: Update the null implementation.

## [0.2.12] - 2016-07-10

### Added

- **CoreAudio**: Add get_period to Voice.

### Changed

- **CoreAudio**: Update to coreaudio-rs 0.5.0.

### Fixed

- **CoreAudio**: Correct implementation of get_pending_samples.
- **CoreAudio**: Return correct Voice period.

## [0.2.11] - 2016-04-25

### Fixed

- Be more relaxed with c_void.

## [0.2.10] - 2016-04-22

### Added

- **ALSA**: Add pollfd.

### Fixed

- **ALSA**: Fix underflow detection.
- **Android**: Fix the android build.
- **Android**: Add ARM target.

## [0.2.9] - 2016-01-28

### Added

- **CoreAudio**: Add support for U16/I16 PCM formats.
- **CoreAudio**: Implement some missing functions.

### Changed

- Handle channels positionning.
- Update Cargo.toml after the previous changes.
- Allow for building for mipsel targets.
- **ALSA**: Use correct ALSA channels.
- **CoreAudio**: Implementation cleanup.
- **CoreAudio**: Make Voice Send/Sync.
- **CoreAudio**: Set sample rate to 44100.
- **Examples**: Update the beep example.

### Fixed

- **ALSA**: Fix underflow bug on linux.
- **CI**: Fix for travis build.
- **CoreAudio**: Fix compilation on OSX with the new API for coreaudio-rs.
- **CoreAudio**: Return correct length of buffer, stub unimpl funcs.
- **CoreAudio**: Restore CoreAudio support after API overhaul.
- **Examples**: Add some sane error messages.
- **Examples**: Improve error reporting in beep example.

### Removed

- Do not use a wildcard version number.
- **CoreAudio**: Revert "Add support for U16/I16 PCM formats" (was causing issues).

## [0.2.8] - 2015-11-10

### Changed

- Libc 0.2.
- **WASAPI**: Update winapi.

### Fixed

- **WASAPI**: Catch another 'device not found' error code.

## [0.2.7] - 2015-09-27

### Added

- `Voice::get_period()` method.

## [0.2.6] - 2015-09-22

### Fixed

- **ALSA**: Make sure that all writes succeed.
- **ALSA**: Make the implementation more robust by recovering from underruns.

## [0.2.5] - 2015-09-22

### Added

- `Voice::get_pending_samples` method.

## [0.2.4] - 2015-09-22

### Added

- `endpoint::get_name()` method.
- **Examples**: An enumerate example.
- **WASAPI**: Device name support.

### Changed

- **ALSA**: Correctly enumerate supported formats.

### Fixed

- **ALSA**: Various fixes.
- **ALSA**: Use the correct format.
- **ALSA**: Use the correct device name when enumerating formats.
- **WASAPI**: Fix bug and filter out devices that are not "Output".

## [0.2.3] - 2015-09-22

### Added

- `#[inline]` attributes.
- `underflow()` method to Voice.

### Changed

- Store the format in the public `Voice` struct.
- **WASAPI**: General cleanup.
- **WASAPI**: Update winapi dependency.

### Fixed

- **WASAPI**: Fix the hack in the implementation.

### Removed

- Unused extern crate libc.

## [0.2.2] - 2015-09-11

### Added

- `UnknownBufferType::len()` method.

### Fixed

- **Null**: Restore the null implementation and compile it every time.

## [0.2.1] - 2015-09-10

### Changed

- Handle channels positionning.
- Update Cargo.toml after the previous changes.
- **Examples**: Update the beep example.

### Fixed

- **ALSA**: Fix compilation.

## [0.2.0] - 2015-09-01

### Added

- Proper error handling.
- Supported formats enumeration.
- `endpoint::get_name()` method.

### Changed

- **ALSA**: Make it compile again.
- **WASAPI**: Enable 32bits samples.
- **WASAPI**: Better error handling in format detection.
- **WASAPI**: Now decoding the format from the WAVEFORMAT returned by the winapi.
- **WASAPI**: Handle F32 formats in Voice::new.
- **WASAPI**: Use the format passed as parameter in Voice::new.
- **WASAPI**: Correctly enumerate audio devices (core + wasapi).

### Fixed

- Fix doctests.
- Add more detailed message to panic.

### Removed

- Conversion system.
- Use of box syntax.

## [0.1.2] - 2015-07-22

### Fixed

- **ALSA**: Correct reported sample format.
- **WASAPI**: Fix samples signs on win32.

## [0.1.1] - 2015-07-20

### Fixed

- Fix the version in the README.
- **WASAPI**: Fix the win32 build.

## [0.1.0] - 2015-07-11

### Added

- Bump to 0.1.0.

## [0.0.23] - 2015-07-04

### Fixed

- **WASAPI**: Fix platform-specific dependencies with MSVC.

## [0.0.22] - 2015-06-24

### Fixed

- **ALSA**: Calls to a single ALSA channel are not thread safe.

## [0.0.21] - 2015-06-05

### Changed

- **Examples**: Simplify beep example.
- **WASAPI**: Use shiny new COM.

## [0.0.20] - 2015-04-20

### Changed

- Rustup and version bumps.
- **ALSA**: Remove integer suffixes in alsa-sys.

## [0.0.19] - 2015-04-04

### Changed

- Update for Rustc 1.0.0 beta.

## [0.0.18] - 2015-03-30

### Changed

- Update for change in rustc and winapi.

## [0.0.17] - 2015-03-26

### Changed

- Rustup.
- **ALSA**: Publish alsa-sys before cpal.

## [0.0.16] - 2015-03-25

### Added

- **CoreAudio**: OSX support via the Apple Core Audio, Audio Unit C API. Only supports f32 so far.
- **CoreAudio**: Coreaudio bindings.

### Changed

- Rustup.

### Fixed

- **CI**: Fix travis build.
- **CoreAudio**: Fixed callback to send proper buffersize, removed code in lib where sampleformat affected buffersize.
- **CoreAudio**: Properly shutdown the AudioUnit on drop.

### Removed

- **CoreAudio**: Removed core_audio-sys local bindings in favour of new coreaudio-rs crate.

## [0.0.15] - 2015-02-22

### Changed

- Bump version.
- Update for rustc.

## [0.0.14] - 2015-02-19

### Changed

- Update for rustc.
- **ALSA**: Bump alsa-sys version.
- **ALSA**: Clean up alsa-sys.
- **CI**: Automatically publish on crates.io on successful builds.
- **CI**: Publish alsa-sys too.

## [0.0.13] - 2015-02-12

### Changed

- Update with libc version.

## [0.0.12] - 2015-01-29

### Changed

- Bump version number.

## [0.0.11] - 2015-01-29

### Changed

- Update for rustc.

## [0.0.10] - 2015-01-20

### Added

- **Null**: "null" implementation for platforms that aren't supported.

### Changed

- Changed integer suffix from 'u' to 'us'.
- Bump version number (multiple times).
- Update for rust-1.0 alpha.
- **WASAPI**: Update for winapi.

## [0.0.8] - 2015-01-08

### Changed

- Bump version number.
- Update for Rustc.

## [0.0.7] - 2015-01-05

### Changed

- Update for rustc.

## [0.0.6] - 2014-12-30

### Added

- `#[must_use]` marker for Buffer.

### Changed

- Bump version number.
- Update for changes in rustc.

## [0.0.5] - 2014-12-23

### Added

- `play()` and `pause()` functions.
- Implement f32 to i16 and f32 to u16 conversions.
- Tests for convert_samples_rate.
- Tests for convert_channels.

### Changed

- Cleanup convert_samples_rate.
- Cleanup convert_channels.

### Fixed

- **CI**: Fix the appveyor build.

## [0.0.4] - 2014-12-20

### Changed

- Update for rustc.

## [0.0.3] - 2014-12-17

### Added

- Link to documentation.
- Some documentation.
- Fixes and tests for samples conversions.
- All samples formats.
- Samples formats conversions.
- **CI**: Automatic gh-pages deployment in travis.

### Changed

- Bump version number.
- Improve documentation.
- Use Cow for formats conversions to avoid an allocation and copy.

### Fixed

- Minor README update.
- **CI**: Remove old section from travis.yml.
- **CI**: Fix travis.yml.

### Removed

- Rename `Channel` to `Voice`.

## [0.0.2] - 2014-12-17

### Added

- Basic API.
- Some documentation.
- Keywords.
- Some formats-related functions.
- Some basic data conversion.
- Some samples rate conversions.
- Variable input format system.
- Samples iterator.
- **ALSA**: Basic implementation.
- **ALSA**: alsa-sys library.
- **CI**: Appveyor file.
- **CI**: Config for rust-ci in travis.
- **Examples**: Draft for example music playing.
- **Examples**: Semi-working WASAPI example.
- **WASAPI**: Destructor for wasapi::Channel.

### Changed

- Bump version number.
- Buffer now always has the u8 format.
- Modify API to use a "samples" iterator.
- Change player architecture to avoid data losses.
- Minor nitpicking.
- Update for rustc.
- **ALSA**: Use the official winapi crate.
- **ALSA**: More tweaks for alsa-sys.
- **ALSA**: Minor tweaks in Cargo.toml files.
- **Examples**: Replace example by a smaller one.
- **Examples**: Replace example by a sinusoid generator.
- **Examples**: Rename example to "beep".

### Fixed

- Fix warnings.
- Fix PCM formats conversions not working.
- Fix issue when calling `buffer.samples()` multiple times with the same buffer.
- Sound output now works correctly.
- Minor fixes.
- **WASAPI**: Revert "Switch to retep998/winapi".

### Removed

- Switch back to using buffers.
- Remove old code.

## [0.0.1] - 2014-12-11

### Added

- Initial commit.

[Unreleased]: https://github.com/RustAudio/cpal/compare/v0.17.3...HEAD
[0.17.3]: https://github.com/RustAudio/cpal/compare/v0.17.2...v0.17.3
[0.17.2]: https://github.com/RustAudio/cpal/compare/v0.17.1...v0.17.2
[0.17.1]: https://github.com/RustAudio/cpal/compare/v0.17.0...v0.17.1
[0.17.0]: https://github.com/RustAudio/cpal/compare/v0.16.0...v0.17.0
[0.16.0]: https://github.com/RustAudio/cpal/compare/v0.15.3...v0.16.0
[0.15.3]: https://github.com/RustAudio/cpal/compare/v0.15.2...v0.15.3
[0.15.2]: https://github.com/RustAudio/cpal/compare/v0.15.1...v0.15.2
[0.15.1]: https://github.com/RustAudio/cpal/compare/v0.15.0...v0.15.1
[0.15.0]: https://github.com/RustAudio/cpal/compare/v0.14.2...v0.15.0
[0.14.2]: https://github.com/RustAudio/cpal/compare/v0.14.1...v0.14.2
[0.14.1]: https://github.com/RustAudio/cpal/compare/v0.14.0...v0.14.1
[0.14.0]: https://github.com/RustAudio/cpal/compare/v0.13.5...v0.14.0
[0.13.5]: https://github.com/RustAudio/cpal/compare/v0.13.4...v0.13.5
[0.13.4]: https://github.com/RustAudio/cpal/compare/v0.13.3...v0.13.4
[0.13.3]: https://github.com/RustAudio/cpal/compare/v0.13.2...v0.13.3
[0.13.2]: https://github.com/RustAudio/cpal/compare/v0.13.1...v0.13.2
[0.13.1]: https://github.com/RustAudio/cpal/compare/v0.13.0...v0.13.1
[0.13.0]: https://github.com/RustAudio/cpal/compare/v0.12.1...v0.13.0
[0.12.1]: https://github.com/RustAudio/cpal/compare/v0.12.0...v0.12.1
[0.12.0]: https://github.com/RustAudio/cpal/compare/v0.11.0...v0.12.0
[0.11.0]: https://github.com/RustAudio/cpal/compare/v0.10.0...v0.11.0
[0.10.0]: https://github.com/RustAudio/cpal/compare/v0.9.0...v0.10.0
[0.9.0]: https://github.com/RustAudio/cpal/compare/v0.8.2...v0.9.0
[0.8.2]: https://github.com/RustAudio/cpal/compare/v0.8.1...v0.8.2
[0.8.1]: https://github.com/RustAudio/cpal/compare/v0.8.0...v0.8.1
[0.8.0]: https://github.com/RustAudio/cpal/compare/v0.7.0...v0.8.0
[0.7.0]: https://github.com/RustAudio/cpal/compare/v0.6.0...v0.7.0
[0.6.0]: https://github.com/RustAudio/cpal/compare/v0.5.1...v0.6.0
[0.5.1]: https://github.com/RustAudio/cpal/compare/v0.5.0...v0.5.1
[0.5.0]: https://github.com/RustAudio/cpal/compare/v0.4.6...v0.5.0
[0.4.6]: https://github.com/RustAudio/cpal/compare/v0.4.5...v0.4.6
[0.4.5]: https://github.com/RustAudio/cpal/compare/v0.4.4...v0.4.5
[0.4.4]: https://github.com/RustAudio/cpal/compare/v0.4.3...v0.4.4
[0.4.3]: https://github.com/RustAudio/cpal/compare/v0.4.2...v0.4.3
[0.4.2]: https://github.com/RustAudio/cpal/compare/v0.4.1...v0.4.2
[0.4.1]: https://github.com/RustAudio/cpal/compare/v0.4.0...v0.4.1
[0.4.0]: https://github.com/RustAudio/cpal/compare/v0.3.1...v0.4.0
[0.3.1]: https://github.com/RustAudio/cpal/compare/v0.3.0...v0.3.1
[0.3.0]: https://github.com/RustAudio/cpal/compare/v0.2.12...v0.3.0
[0.2.12]: https://github.com/RustAudio/cpal/compare/v0.2.11...v0.2.12
[0.2.11]: https://github.com/RustAudio/cpal/compare/v0.2.10...v0.2.11
[0.2.10]: https://github.com/RustAudio/cpal/compare/v0.2.9...v0.2.10
[0.2.9]: https://github.com/RustAudio/cpal/compare/v0.2.8...v0.2.9
[0.2.8]: https://github.com/RustAudio/cpal/compare/v0.2.7...v0.2.8
[0.2.7]: https://github.com/RustAudio/cpal/compare/v0.2.6...v0.2.7
[0.2.6]: https://github.com/RustAudio/cpal/compare/v0.2.5...v0.2.6
[0.2.5]: https://github.com/RustAudio/cpal/compare/v0.2.4...v0.2.5
[0.2.4]: https://github.com/RustAudio/cpal/compare/v0.2.3...v0.2.4
[0.2.3]: https://github.com/RustAudio/cpal/compare/v0.2.2...v0.2.3
[0.2.2]: https://github.com/RustAudio/cpal/compare/v0.2.1...v0.2.2
[0.2.1]: https://github.com/RustAudio/cpal/compare/v0.2.0...v0.2.1
[0.2.0]: https://github.com/RustAudio/cpal/compare/v0.1.2...v0.2.0
[0.1.2]: https://github.com/RustAudio/cpal/compare/v0.1.1...v0.1.2
[0.1.1]: https://github.com/RustAudio/cpal/compare/v0.1.0...v0.1.1
[0.1.0]: https://github.com/RustAudio/cpal/compare/v0.0.23...v0.1.0
[0.0.23]: https://github.com/RustAudio/cpal/compare/v0.0.22...v0.0.23
[0.0.22]: https://github.com/RustAudio/cpal/compare/v0.0.21...v0.0.22
[0.0.21]: https://github.com/RustAudio/cpal/compare/v0.0.20...v0.0.21
[0.0.20]: https://github.com/RustAudio/cpal/compare/v0.0.19...v0.0.20
[0.0.19]: https://github.com/RustAudio/cpal/compare/v0.0.18...v0.0.19
[0.0.18]: https://github.com/RustAudio/cpal/compare/v0.0.17...v0.0.18
[0.0.17]: https://github.com/RustAudio/cpal/compare/v0.0.16...v0.0.17
[0.0.16]: https://github.com/RustAudio/cpal/compare/v0.0.15...v0.0.16
[0.0.15]: https://github.com/RustAudio/cpal/compare/v0.0.14...v0.0.15
[0.0.14]: https://github.com/RustAudio/cpal/compare/v0.0.13...v0.0.14
[0.0.13]: https://github.com/RustAudio/cpal/compare/v0.0.12...v0.0.13
[0.0.12]: https://github.com/RustAudio/cpal/compare/v0.0.11...v0.0.12
[0.0.11]: https://github.com/RustAudio/cpal/compare/v0.0.10...v0.0.11
[0.0.10]: https://github.com/RustAudio/cpal/compare/v0.0.8...v0.0.10
[0.0.8]: https://github.com/RustAudio/cpal/compare/v0.0.7...v0.0.8
[0.0.7]: https://github.com/RustAudio/cpal/compare/v0.0.6...v0.0.7
[0.0.6]: https://github.com/RustAudio/cpal/compare/v0.0.5...v0.0.6
[0.0.5]: https://github.com/RustAudio/cpal/compare/v0.0.4...v0.0.5
[0.0.4]: https://github.com/RustAudio/cpal/compare/v0.0.3...v0.0.4
[0.0.3]: https://github.com/RustAudio/cpal/compare/v0.0.2...v0.0.3
[0.0.2]: https://github.com/RustAudio/cpal/compare/v0.0.1...v0.0.2
[0.0.1]: https://github.com/RustAudio/cpal/releases/tag/v0.0.1