149 lines
3.4 KiB
Rust
149 lines
3.4 KiB
Rust
use alsa::card::Card;
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use alsa::mixer::{Mixer, Selem, SelemId, Elem};
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use alsa;
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use errors::*;
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use libc::c_int;
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use std::iter::Map;
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use std::iter::Filter;
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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_first_playable_alsa_card() -> Result<Card> {
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for m_card in get_alsa_cards() {
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match m_card {
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Ok(card) => {
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if alsa_card_has_playable_selem(&card) {
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return Ok(card);
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}
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}
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_ => (),
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}
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}
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bail!("No playable alsa card found!")
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}
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pub fn get_playable_alsa_card_names() -> Vec<String> {
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let mut vec = vec![];
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for m_card in get_alsa_cards() {
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match m_card {
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Ok(card) => {
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if alsa_card_has_playable_selem(&card) {
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let m_name = card.get_name();
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if m_name.is_ok() {
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vec.push(m_name.unwrap())
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}
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}
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}
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_ => (),
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}
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}
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return vec;
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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 alsa_card_has_playable_selem(card: &Card) -> bool {
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let mixer = try_wr!(get_mixer(&card), false);
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for selem in get_playable_selems(&mixer) {
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if selem_is_playable(&selem) {
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return true;
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}
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}
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return false;
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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_playable_selems(mixer: &Mixer) -> Vec<Selem> {
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let mut v = vec![];
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for s in mixer.iter().map(get_selem).filter(selem_is_playable) {
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v.push(s);
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}
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return v;
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}
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pub fn get_first_playable_selem(mixer: &Mixer) -> Result<Selem> {
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for s in mixer.iter().map(get_selem).filter(selem_is_playable) {
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return Ok(s);
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}
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bail!("No playable Selem found!")
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}
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pub fn get_playable_selem_names(mixer: &Mixer) -> Vec<String> {
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let mut vec = vec![];
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for selem in get_playable_selems(mixer) {
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let n = selem.get_id().get_name().map(|y| String::from(y));
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match n {
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Ok(name) => vec.push(name),
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_ => (),
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}
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}
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return vec;
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}
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pub fn get_playable_selem_by_name(mixer: &Mixer,
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name: String)
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-> Result<Selem> {
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for selem in get_playable_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 playable selem named {}", name);
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}
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pub fn selem_is_playable(selem: &Selem) -> bool {
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return selem.has_playback_volume();
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}
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