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//! Thin but safe wrappers for [ALSA](https://alsa-project.org).
//!
//! [GitHub repo](https://github.com/diwic/alsa-rs)
//!
//! [Crates.io](https://crates.io/crates/alsa)
//!
//! This ALSA API wrapper/binding is WIP - the ALSA API is huge, and new
//! functions and structs might be added as requested.
//!
//! Most functions map 1-to-1 to alsa-lib functions, e g, `ctl::CardInfo::get_id()` is a wrapper around
//! `snd_ctl_card_info_get_id` and the [alsa-lib documentation](https://www.alsa-project.org/alsa-doc/alsa-lib/)
//! can be consulted for additional information.
//!
//! Enjoy!
#![allow(clippy::all)]
#![warn(clippy::correctness, clippy::suspicious, clippy::perf)]
extern crate alsa_sys as alsa;
extern crate libc;
#[macro_use]
extern crate bitflags;
#[macro_use]
extern crate nix as nix_the_crate;
macro_rules! alsa_enum {
($(#[$attr:meta])+ $name:ident, $static_name:ident [$count:expr], $( $a:ident = $b:ident),* ,) =>
{
#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
$(#[$attr])*
pub enum $name {
$(
$a = alsa::$b as isize,
)*
}
static $static_name: [$name; $count] =
[ $( $name::$a, )* ];
impl $name {
/// Returns a slice of all possible values; useful for iteration
pub fn all() -> &'static [$name] { &$static_name[..] }
#[allow(dead_code)]
fn from_c_int(c: ::libc::c_int, s: &'static str) -> Result<$name> {
Self::all().iter().find(|&&x| c == x as ::libc::c_int).map(|&x| x)
.ok_or_else(|| Error::unsupported(s))
}
#[allow(dead_code)]
fn to_c_int(&self) -> ::libc::c_int {
return *self as ::libc::c_int;
}
}
}
}
/// Replaces constants ending with PLAYBACK/CAPTURE as well as
/// INPUT/OUTPUT
#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord)]
pub enum Direction {
Playback,
Capture
}
impl Direction {
#[inline]
pub fn input() -> Direction { Direction::Capture }
#[inline]
pub fn output() -> Direction { Direction::Playback }
}
/// Used to restrict hw parameters. In case the submitted
/// value is unavailable, in which direction should one search
/// for available values?
#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord)]
pub enum ValueOr {
/// The value set is the submitted value, or less
Less = -1,
/// The value set is the submitted value, or the nearest
Nearest = 0,
/// The value set is the submitted value, or greater
Greater = 1,
}
/// Rounding mode (used in some mixer related calls)
#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord)]
pub enum Round {
/// Round down (towards negative infinity)
Floor = 0,
/// Round up (towards positive infinity)
Ceil = 1,
}
mod error;
pub use crate::error::{Error, Result};
pub mod card;
pub use crate::card::Card as Card;
mod ctl_int;
pub mod ctl {
//! Control device API
pub use super::ctl_int::{Ctl, CardInfo, DeviceIter, ElemIface, ElemId, ElemType, ElemValue, ElemInfo};
}
pub use crate::ctl::Ctl as Ctl;
pub mod hctl;
pub use crate::hctl::HCtl as HCtl;
pub mod pcm;
pub use crate::pcm::PCM as PCM;
pub mod rawmidi;
pub use crate::rawmidi::Rawmidi as Rawmidi;
pub mod device_name;
pub mod poll;
pub use crate::poll::Descriptors as PollDescriptors;
pub mod mixer;
pub use crate::mixer::Mixer as Mixer;
pub mod seq;
pub use crate::seq::Seq as Seq;
mod io;
pub use crate::io::Output;
// Reexported inside PCM module
mod chmap;
pub mod direct;
/// Re-exports from the nix crate.
///
/// Use these re-exports instead of also depending on the nix crate. There
/// is no guarantee that these will match a specific nix version, it may
/// change between minor updates of the library.
pub mod nix {
pub use nix_the_crate::Error;
pub use nix_the_crate::errno;
}
|
