Cargo.toml

[package]
name = "cpal"
version = "0.18.0"
description = "Low-level cross-platform audio I/O library in pure Rust."
repository = "https://github.com/RustAudio/cpal"
documentation = "https://docs.rs/cpal"
license = "Apache-2.0"
keywords = ["audio", "sound"]
edition = "2021"
rust-version = "1.78"

[features]
default = ["realtime-dbus"]

# Real-time audio thread scheduling
# Promotes audio callback threads to real-time or high-priority scheduling for lower latency
# Requires: (Linux/BSD) `rtprio` granted in `limits.conf` (e.g. `@audio - rtprio 95`)
# Platform: Linux, DragonFly BSD, FreeBSD, NetBSD, Windows, Android
realtime = ["dep:audio_thread_priority"]

# D-Bus/rtkit support on top of `realtime` for RT scheduling on Linux/BSD desktop systems
# Requires: D-Bus development libraries (libdbus-1-dev or equivalent)
# Platform: Linux, DragonFly BSD, FreeBSD, NetBSD (D-Bus/rtkit is a no-op elsewhere; thread
#           priority promotion from `realtime` still applies on Windows and Android)
realtime-dbus = ["realtime", "audio_thread_priority/with_dbus"]

# ASIO backend for Windows
# Provides low-latency audio I/O by bypassing the Windows audio stack
# Requires: ASIO drivers and LLVM/Clang for build-time bindings
# See README for detailed setup instructions
asio = [
    "dep:asio-sys",
    "dep:num-traits",
]

# Audio Worklet backend for WebAssembly
# Provides lower-latency web audio processing compared to default Web Audio API
# Requires: Build with atomics support and Cross-Origin headers for SharedArrayBuffer
# Platform: WebAssembly (wasm32-unknown-unknown)
audioworklet = [
    "wasm-bindgen",
    "web-sys/Blob",
    "web-sys/BlobPropertyBag",
    "web-sys/Url",
    "web-sys/AudioWorklet",
    "web-sys/AudioWorkletNode",
    "web-sys/AudioWorkletNodeOptions",
]

# Support for user-defined custom hosts, devices, and streams
# See examples/custom.rs for usage
# Platform: All platforms
custom = []

# JACK Audio Connection Kit backend
# Provides low-latency connections between applications and audio hardware
# Requires: JACK server and client libraries installed on the system
# Platform: Linux, DragonFly BSD, FreeBSD, NetBSD, macOS, Windows
# Note: JACK must be installed separately on all platforms
jack = ["dep:jack"]

# PipeWire backend
# Provides audio I/O on Linux and some BSDs via the PipeWire multimedia server
# Requires: PipeWire server and client libraries installed on the system
# Platform: Linux, DragonFly BSD, FreeBSD, NetBSD
pipewire = ["dep:pipewire"]

# PulseAudio backend
# Provides audio I/O support on Linux and some BSDs using the PulseAudio sound server
# Requires: PulseAudio server and client libraries installed on the system
# Platform: Linux, DragonFly BSD, FreeBSD, NetBSD
pulseaudio = ["dep:pulseaudio", "dep:futures"]

# WebAssembly backend using wasm-bindgen
# Enables the Web Audio API backend for browser-based audio
# Required for any WebAssembly audio support
# Platform: WebAssembly (wasm32-unknown-unknown)
# Note: This is typically enabled automatically when targeting wasm32
wasm-bindgen = ["dep:wasm-bindgen", "dep:wasm-bindgen-futures"]

[dependencies]
dasp_sample = "0.11"

[dev-dependencies]
anyhow = "1.0"
hound = "3.5"
ringbuf = "0.4"
clap = { version = ">=4.0, <=4.5.57", features = ["derive"] }

# Support a range of versions in order to avoid duplication of this crate. Make sure to test all
# versions when bumping to a new release, and only increase the minimum when absolutely necessary.
# windows 0.61 removed the `implement` feature flag, so #[windows::core::implement] works
# unconditionally from 0.61 onward. Keep the upper bound in sync with the CI matrix below.
[target.'cfg(target_os = "windows")'.dependencies]
windows-core = { version = ">=0.61, <=0.62" }
windows = { version = ">=0.61, <=0.62", features = [
    "Win32_Media",
    "Win32_Media_Audio",
    "Win32_Foundation",
    "Win32_Devices_Properties",
    "Win32_Media_KernelStreaming",
    "Win32_System_Com_StructuredStorage",
    "Win32_System_Threading",
    "Win32_System_Performance",
    "Win32_Security",
    "Win32_System_SystemServices",
    "Win32_System_Variant",
    "Win32_Media_Multimedia",
    "Win32_UI_Shell_PropertiesSystem",
] }
audio_thread_priority = { version = "0.35", optional = true, default-features = false }
asio-sys = { version = "0.3.0", path = "asio-sys", optional = true }
num-traits = { version = "0.2", optional = true }
jack = { version = "0.13", optional = true }

[target.'cfg(any(target_os = "linux", target_os = "dragonfly", target_os = "freebsd", target_os = "netbsd"))'.dependencies]
alsa = "0.11"
libc = "0.2"
audio_thread_priority = { version = "0.35", optional = true, default-features = false }
jack = { version = "0.13", optional = true }
pulseaudio = { version = "0.3", optional = true }
futures = { version = "0.3", optional = true }
pipewire = { version = "0.9", optional = true, features = ["v0_3_53"] }

[target.'cfg(target_vendor = "apple")'.dependencies]
mach2 = "0.6"
coreaudio-rs = { version = "0.14.2", default-features = false, features = [
    "core_audio",
    "audio_toolbox",
] }
objc2-core-audio = { version = "0.3", default-features = false, features = [
    "std",
    "AudioHardware",
    "AudioHardwareDeprecated",
    "objc2",
    "objc2-foundation",
] }
objc2-audio-toolbox = { version = "0.3", default-features = false, features = [
    "std",
    "AUComponent",
    "AudioUnitProperties",
] }
objc2-core-audio-types = { version = "0.3", default-features = false, features = [
    "std",
    "CoreAudioBaseTypes",
] }
objc2-core-foundation = { version = "0.3" }
objc2-foundation = { version = "0.3", default-features = false, features = [
    "std",
    "NSArray",
    "NSString",
    "NSValue",
] }
objc2 = { version = "0.6" }

[target.'cfg(target_os = "macos")'.dependencies]
jack = { version = "0.13", optional = true }

[target.'cfg(any(target_os = "ios", target_os = "tvos"))'.dependencies]
block2 = "0.6"
objc2-foundation = { version = "0.3", features = [
    "block2",
    "NSDictionary",
    "NSNotification",
    "NSOperation",
] }
objc2-avf-audio = { version = "0.3", default-features = false, features = [
    "std",
    "AVAudioSession",
    "AVAudioSessionTypes",
] }

[target.'cfg(all(target_arch = "wasm32", target_os = "unknown"))'.dependencies]
wasm-bindgen = { version = "0.2", optional = true }
wasm-bindgen-futures = { version = "0.4", optional = true }
js-sys = { version = "0.3" }
web-sys = { version = "0.3", features = [
    "AudioContext",
    "AudioContextOptions",
    "AudioBuffer",
    "AudioBufferSourceNode",
    "AudioNode",
    "AudioDestinationNode",
    "Window",
    "AudioContextState",
] }

[target.'cfg(target_os = "android")'.dependencies]
audio_thread_priority = { version = "0.35", optional = true, default-features = false }
ndk = { version = "0.9", default-features = false, features = [
    "audio",
    "api-level-26",
] }
ndk-context = "0.1"
jni = "0.21"
libc = "0.2"
num-derive = "0.4"
num-traits = "0.2"

[[example]]
name = "beep"

[[example]]
name = "enumerate"

[[example]]
name = "feedback"

[[example]]
name = "record_wav"

[[example]]
name = "synth_tones"

[package.metadata.docs.rs]
all-features = true
rustdoc-args = ["--cfg", "docsrs"]
targets = [
    "x86_64-unknown-linux-gnu",
    "x86_64-pc-windows-msvc",
    "x86_64-apple-darwin",
    "aarch64-apple-darwin",
    "aarch64-apple-ios",
    "wasm32-unknown-unknown",
    "aarch64-linux-android",
    "x86_64-unknown-freebsd",
    "x86_64-unknown-netbsd",
    "x86_64-unknown-dragonfly",
]