2017-06-26 07:08:37 +00:00
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extern crate alsa;
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2017-06-26 15:56:09 +00:00
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extern crate std;
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extern crate libc;
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2017-06-26 07:08:37 +00:00
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2017-06-26 21:52:21 +00:00
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use self::alsa::card::Card;
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2017-06-26 15:56:09 +00:00
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use self::alsa::mixer::{Mixer, Selem, Elem};
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use alsa::mixer::SelemChannelId::*;
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use std::iter::Map;
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use self::libc::c_int;
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2017-06-26 07:08:37 +00:00
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pub fn get_default_alsa_card() -> Card {
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2017-06-26 15:56:09 +00:00
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return get_alsa_card_by_id(0);
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}
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pub fn get_alsa_card_by_id(index: c_int) -> Card {
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return alsa::Card::new(index);
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}
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2017-06-26 07:08:37 +00:00
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2017-06-26 15:56:09 +00:00
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pub fn get_alsa_cards() -> alsa::card::Iter {
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return alsa::card::Iter::new();
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2017-06-26 07:08:37 +00:00
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}
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pub fn get_mixer(card: Card) -> Mixer {
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2017-06-26 21:52:21 +00:00
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let mixer = Mixer::new(&format!("hw:{}", card.get_index()), false).unwrap();
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2017-06-26 07:08:37 +00:00
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return mixer;
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}
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2017-06-26 15:56:09 +00:00
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pub fn get_selems(mixer: &Mixer) -> Map<alsa::mixer::Iter, fn(Elem) -> Selem> {
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return mixer.iter().map(get_selem);
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2017-06-26 07:08:37 +00:00
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}
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2017-06-26 15:56:09 +00:00
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pub fn get_selem_by_name<'a>(mixer: &'a Mixer, name: String) -> Option<Selem> {
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for selem in get_selems(mixer) {
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2017-06-26 21:52:21 +00:00
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let m_name = selem.get_id()
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.get_name()
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.map(|y| String::from(y))
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.ok();
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let retval = m_name.map_or(false, |n| { return n == name; });
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2017-06-26 07:08:37 +00:00
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if retval {
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2017-06-26 15:56:09 +00:00
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return Some(selem);
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2017-06-26 07:08:37 +00:00
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}
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}
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return None;
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}
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2017-06-26 15:56:09 +00:00
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pub fn get_vol(selem: Selem) -> Result<f64, alsa::Error> {
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let (min, max) = selem.get_playback_volume_range();
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let volume = selem.get_playback_volume(FrontRight).map(|v| {
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return ((v - min) as f64) / ((max - min) as f64) * 100.0;
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});
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return volume;
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}
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pub fn get_selem(elem: Elem) -> Selem {
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/* in the ALSA API, there are currently only simple elements,
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* so this unwrap() should be safe.
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*http://www.alsa-project.org/alsa-doc/alsa-lib/group___mixer.html#enum-members */
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return Selem::new(elem).unwrap();
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}
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2017-06-26 07:08:37 +00:00
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// pub fn list_channels(card: Card, hctl: HCtl) -> [str] {
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// }
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