Struct alsa::Ctl

pub struct Ctl(_);

snd_ctl_t wrapper

Methods

impl Ctl

pub fn new(c: &str, nonblock: bool) -> Result<Self>

Wrapper around open that takes a &str instead of a &CStr

pub fn open(c: &CStr, nonblock: bool) -> Result<Ctl>

Open does not support async mode (it's not very Rustic anyway)

pub fn from_card(c: &Card, nonblock: bool) -> Result<Ctl>

pub fn card_info(&self) -> Result<CardInfo>

pub fn wait(&self, timeout_ms: Option<u32>) -> Result<bool>

pub fn get_db_range(&self, id: &ElemId) -> Result<(MilliBel, MilliBel)>

pub fn convert_to_db(&self, id: &ElemId, volume: i64) -> Result<MilliBel>

pub fn convert_from_db(
    &self,
    id: &ElemId,
    mb: MilliBel,
    dir: Round
) -> Result<i64>

pub fn subscribe_events(&self, subscribe: bool) -> Result<()>

Note: According to alsa-lib documentation, you're also supposed to have functionality for returning whether or not you are subscribed. This does not work in practice, so I'm not including that here.

pub fn read(&self) -> Result<Option<Event>>

Trait Implementations

impl PollDescriptors for Ctl

fn count(&self) -> usize

fn fill(&self, p: &mut [pollfd]) -> Result<usize>

fn revents(&self, p: &[pollfd]) -> Result<PollFlags>

fn get(&self) -> Result<Vec<pollfd>>

Wrapper around count and fill - returns an array of pollfds

impl Drop for Ctl

fn drop(&mut self)

Executes the destructor for this type.

impl Send for Ctl