124 lines
2.8 KiB
Rust
124 lines
2.8 KiB
Rust
use alsa;
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use alsa::card::Card;
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use 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 libc::c_int;
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use errors::*;
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use app_state;
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pub fn get_default_alsa_card() -> Card {
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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 Card::new(index);
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}
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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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}
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pub fn get_alsa_card_by_name(name: String) -> Result<Card> {
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for r_card in get_alsa_cards() {
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let card = r_card?;
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let card_name = card.get_name()?;
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if name == card_name {
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return Ok(card);
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}
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}
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bail!("Not found a matching card named {}", name);
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}
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pub fn get_mixer(card: &Card) -> Result<Mixer> {
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return Mixer::new(&format!("hw:{}", card.get_index()), false).from_err();
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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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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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}
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pub fn get_selem_by_name(mixer: &Mixer, name: String) -> Result<Selem> {
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for selem in get_selems(mixer) {
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let n = selem.get_id()
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.get_name()
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.map(|y| String::from(y))?;
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if n == name {
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return Ok(selem);
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}
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}
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bail!("Not found a matching selem named {}", name);
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}
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pub fn vol_to_percent(vol: i64, range: (i64, i64)) -> f64 {
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let (min, max) = range;
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return ((vol - min) as f64) / ((max - min) as f64) * 100.0;
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}
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pub fn percent_to_vol(vol: f64, range: (i64, i64)) -> i64 {
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let (min, max) = range;
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let _v = vol / 100.0 * ((max - min) as f64) + (min as f64);
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/* TODO: precision? Use direction. */
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return _v as i64;
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}
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pub fn get_vol(selem: &Selem) -> Result<f64> {
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let range = selem.get_playback_volume_range();
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let volume = selem.get_playback_volume(FrontRight).map(|v| {
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return vol_to_percent(v, range);
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});
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return volume.from_err();
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}
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pub fn set_vol(selem: &Selem, new_vol: f64) -> Result<()> {
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/* auto-unmute */
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if get_mute(selem)? {
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set_mute(selem, false)?;
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}
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let range = selem.get_playback_volume_range();
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selem.set_playback_volume_all(percent_to_vol(new_vol, range))?;
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return Ok(());
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}
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pub fn has_mute(selem: &Selem) -> bool {
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return selem.has_playback_switch();
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}
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pub fn get_mute(selem: &Selem) -> Result<bool> {
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let val = selem.get_playback_switch(FrontRight)?;
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return Ok(val == 0);
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}
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pub fn set_mute(selem: &Selem, mute: bool) -> Result<()> {
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/* true -> mute, false -> unmute */
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let _ = selem.set_playback_switch_all(!mute as i32)?;
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return Ok(());
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}
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