alsa/
card.rs

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1//! Sound card enumeration
2use libc::{c_int, c_char};
3use super::error::*;
4use crate::alsa;
5use std::ffi::CStr;
6
7/// An ALSA sound card, uniquely identified by its index.
8#[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord)]
9pub struct Card(c_int);
10
11/// Iterate over existing sound cards.
12pub struct Iter(c_int);
13
14impl Iter {
15    pub fn new() -> Iter { Iter(-1) }
16}
17
18impl Iterator for Iter {
19    type Item = Result<Card>;
20
21    fn next(&mut self) -> Option<Result<Card>> {
22        match acheck!(snd_card_next(&mut self.0)) {
23            Ok(_) if self.0 == -1 => None,
24            Ok(_) => Some(Ok(Card(self.0))),
25            Err(e) => Some(Err(e)),
26        }
27    }
28}
29
30impl Card {
31    pub fn new(index: c_int) -> Card { Card(index) }
32    pub fn from_str(s: &CStr) -> Result<Card> {
33        acheck!(snd_card_get_index(s.as_ptr())).map(Card)
34    }
35    pub fn get_name(&self) -> Result<String> {
36        let mut c: *mut c_char = ::std::ptr::null_mut();
37        acheck!(snd_card_get_name(self.0, &mut c))
38            .and_then(|_| from_alloc("snd_card_get_name", c)) 
39    }
40    pub fn get_longname(&self) -> Result<String> {
41        let mut c: *mut c_char = ::std::ptr::null_mut();
42        acheck!(snd_card_get_longname(self.0, &mut c))
43            .and_then(|_| from_alloc("snd_card_get_longname", c)) 
44    }
45
46    pub fn get_index(&self) -> c_int { self.0 }
47}
48
49#[test]
50fn print_cards() {
51    for a in Iter::new().map(|a| a.unwrap()) {
52        println!("Card #{}: {} ({})", a.get_index(), a.get_name().unwrap(), a.get_longname().unwrap())
53    }
54}
alsa/card.rs

alsa/
card.rs
