mirror of
https://github.com/librespot-org/librespot.git
synced 2025-01-07 17:24:04 +00:00
66 lines
2.3 KiB
Rust
66 lines
2.3 KiB
Rust
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use std::io;
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pub trait Open {
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fn open() -> Self;
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}
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pub trait Sink {
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fn start(&self) -> io::Result<()>;
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fn stop(&self) -> io::Result<()>;
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fn write(&self, data: &[i16]) -> io::Result<()>;
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}
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/*
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* Allow #[cfg] rules around elements of a list.
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* Workaround until stmt_expr_attributes is stable.
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*
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* This generates 2^n declarations of the list, with every combination possible
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*/
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macro_rules! declare_backends {
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(pub const $name:ident : $ty:ty = & [ $($tt:tt)* ];) => (
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_declare_backends!($name ; $ty ; []; []; []; $($tt)*);
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);
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}
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macro_rules! _declare_backends {
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($name:ident ; $ty:ty ; [ $($yes:meta,)* ] ; [ $($no:meta,)* ] ; [ $($exprs:expr,)* ] ; #[cfg($m:meta)] $e:expr, $($rest:tt)* ) => (
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_declare_backends!($name ; $ty ; [ $m, $($yes,)* ] ; [ $($no,)* ] ; [ $($exprs,)* $e, ] ; $($rest)*);
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_declare_backends!($name ; $ty ; [ $($yes,)* ] ; [ $m, $($no,)* ] ; [ $($exprs,)* ] ; $($rest)*);
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);
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($name:ident ; $ty:ty ; [ $($yes:meta,)* ] ; [ $($no:meta,)* ] ; [ $($exprs:expr,)* ] ; $e:expr, $($rest:tt)*) => (
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_declare_backends!($name ; $ty ; [ $($yes,)* ] ; [ $($no,)* ] ; [ $($exprs,)* $e, ] ; $($rest)*);
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);
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($name:ident ; $ty:ty ; [ $($yes:meta,)* ] ; [ $($no:meta,)* ] ; [ $($exprs:expr,)* ] ; #[cfg($m:meta)] $e:expr) => (
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_declare_backends!($name ; $ty ; [ $m, $($yes,)* ] ; [ $($no,)* ] ; [ $($exprs,)* $e, ] ; );
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_declare_backends!($name ; $ty ; [ $($yes,)* ] ; [ $m, $($no,)* ] ; [ $($exprs,)* ] ; );
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);
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($name:ident ; $ty:ty ; [ $($yes:meta,)* ] ; [ $($no:meta,)* ] ; [ $($exprs:expr,)* ] ; $e:expr ) => (
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_declare_backends!($name ; $ty ; [ $($yes,)* ] ; [ $($no,)* ] ; [ $($exprs,)* $e, ] ; );
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);
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($name:ident ; $ty:ty ; [ $($yes:meta,)* ] ; [ $($no:meta,)* ] ; [ $($exprs:expr,)* ] ; ) => (
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#[cfg(all($($yes,)* not(any($($no),*))))]
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pub const $name : $ty = &[
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$($exprs,)*
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];
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)
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}
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#[allow(dead_code)]
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fn mk_sink<S: Sink + Open + 'static>() -> Box<Sink> {
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Box::new(S::open())
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}
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#[cfg(feature = "portaudio-backend")]
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mod portaudio;
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declare_backends! {
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pub const BACKENDS : &'static [(&'static str, &'static (Fn() -> Box<Sink> + Sync + Send + 'static))] = &[
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#[cfg(feature = "portaudio-backend")]
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("portaudio", &mk_sink::<self::portaudio::PortAudioSink>),
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];
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}
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