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ALSA bindings for Rust
=======================
Thin but safe wrappers for [ALSA](https://alsa-project.org), the most
common API for accessing audio devices on Linux.
[](https://crates.io/crates/alsa)
[](https://docs.rs/alsa)
[](https://crates.io/crates/alsa)
The ALSA API is rather big, so everything is not covered yet, but expect the following to work:
* Audio Playback (example in `pcm` module docs)
* Audio Recording
* Mixer controls
* HCtl API (jack detection example in `hctl` module docs)
* Raw midi
* Midi sequencer (most of it)
* Ctl API
* Device name hints (example in `device_name` module docs)
* Enumerations of all of the above
* Poll and/or wait for all of the above
The following is not yet implemented (mostly because nobody asked for them) :
* Separate timer API (snd_timer_*)
* Config API (snd_config_*)
* Plug-in API
Quickstart guide / API design:
* 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.
* Structs are RAII and closed/freed on drop, e g, when a `PCM` struct is dropped, `snd_pcm_close` is called.
* To read and write buffers, call the `io_*` methods. It will return a separate struct from which you can
read or write, and which can also be used for mmap (if supported by the driver).
* Error handling - most alsa-lib functions can return errors, so the return value from these is a `Result`.
* Enumeration of cards, devices etc is done through structs implementing `Iterator`.
* Many structs implement `poll::Descriptors`, to combine with poll or mio.
Or just use `wait` if you don't need non-blocking functionality.
Notes:
* To run the tests successfully, there must be a "default" sound card configured. This is usually not a problem when running on normal hardware, but some CI systems, docker images etc, might not have that configured by default.
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