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63 lines
2.2 KiB
Markdown
63 lines
2.2 KiB
Markdown
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ALSA bindings for Rust
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=======================
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Thin but safe wrappers for [ALSA](https://alsa-project.org), the most
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common API for accessing audio devices on Linux.
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[](https://crates.io/crates/alsa)
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[](https://docs.rs/alsa)
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[](https://crates.io/crates/alsa)
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The ALSA API is rather big, so everything is not covered yet, but expect the following to work:
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* Audio Playback (example in `pcm` module docs)
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* Audio Recording
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* Mixer controls
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* HCtl API (jack detection example in `hctl` module docs)
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* Raw midi
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* Midi sequencer (most of it)
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* Ctl API
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* Device name hints (example in `device_name` module docs)
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* Enumerations of all of the above
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* Poll and/or wait for all of the above
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The following is not yet implemented (mostly because nobody asked for them) :
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* Separate timer API (snd_timer_*)
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* Config API (snd_config_*)
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* Plug-in API
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Quickstart guide / API design:
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* Most functions map 1-to-1 to alsa-lib functions, e g, `ctl::CardInfo::get_id()` is a wrapper around
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`snd_ctl_card_info_get_id` and the [alsa-lib documentation](https://www.alsa-project.org/alsa-doc/alsa-lib/)
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can be consulted for additional information.
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* Structs are RAII and closed/freed on drop, e g, when a `PCM` struct is dropped, `snd_pcm_close` is called.
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* To read and write buffers, call the `io_*` methods. It will return a separate struct from which you can
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read or write, and which can also be used for mmap (if supported by the driver).
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* Error handling - most alsa-lib functions can return errors, so the return value from these is a `Result`.
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* Enumeration of cards, devices etc is done through structs implementing `Iterator`.
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* Many structs implement `poll::Descriptors`, to combine with poll or mio.
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Or just use `wait` if you don't need non-blocking functionality.
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Notes:
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* 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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