359 lines
9.3 KiB
Rust
359 lines
9.3 KiB
Rust
use alsa_card::*;
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use errors::*;
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use glib;
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use std::cell::Cell;
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use std::cell::Ref;
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use std::cell::RefCell;
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use std::f64;
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use std::rc::Rc;
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use support_audio::*;
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#[derive(Clone, Copy, Debug)]
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pub enum VolLevel {
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Muted,
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Low,
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Medium,
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High,
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Off,
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}
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#[derive(Clone, Copy, Debug)]
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pub enum AudioUser {
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Unknown,
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Popup,
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TrayIcon,
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Hotkeys,
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PrefsWindow,
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}
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#[derive(Clone, Copy, Debug)]
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pub enum AudioSignal {
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NoCard,
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CardInitialized,
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CardCleanedUp,
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CardDisconnected,
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CardError,
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ValuesChanged,
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}
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#[derive(Clone)]
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pub struct Handlers {
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inner: Rc<RefCell<Vec<Box<Fn(AudioSignal, AudioUser)>>>>,
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}
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impl Handlers {
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fn new() -> Handlers {
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return Handlers { inner: Rc::new(RefCell::new(vec![])) };
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}
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fn borrow(&self) -> Ref<Vec<Box<Fn(AudioSignal, AudioUser)>>> {
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return self.inner.borrow();
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}
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fn add_handler(&self, cb: Box<Fn(AudioSignal, AudioUser)>) {
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self.inner.borrow_mut().push(cb);
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}
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}
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pub struct Audio {
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_cannot_construct: (),
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pub acard: RefCell<Box<AlsaCard>>,
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pub last_action_timestamp: Rc<RefCell<i64>>,
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pub handlers: Handlers,
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pub scroll_step: Cell<u32>,
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}
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impl Audio {
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pub fn new(card_name: Option<String>,
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elem_name: Option<String>)
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-> Result<Audio> {
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let handlers = Handlers::new();
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let last_action_timestamp = Rc::new(RefCell::new(0));
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let cb = {
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let myhandler = handlers.clone();
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let ts = last_action_timestamp.clone();
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Rc::new(move |event| {
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on_alsa_event(&mut *ts.borrow_mut(),
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&myhandler.borrow(),
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event)
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})
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};
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let acard = AlsaCard::new(card_name, elem_name, cb);
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/* additionally dispatch signals */
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if acard.is_err() {
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invoke_handlers(&handlers.borrow(),
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AudioSignal::NoCard,
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AudioUser::Unknown);
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} else {
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invoke_handlers(&handlers.borrow(),
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AudioSignal::CardInitialized,
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AudioUser::Unknown);
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}
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let audio = Audio {
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_cannot_construct: (),
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acard: RefCell::new(acard?),
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last_action_timestamp: last_action_timestamp.clone(),
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handlers: handlers.clone(),
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scroll_step: Cell::new(5),
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};
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return Ok(audio);
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}
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pub fn switch_acard(&self,
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card_name: Option<String>,
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elem_name: Option<String>,
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user: AudioUser)
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-> Result<()> {
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debug!("Switching cards");
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debug!("Old card name: {}",
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self.acard
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.borrow()
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.card_name()
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.unwrap());
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debug!("Old chan name: {}",
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self.acard
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.borrow()
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.chan_name()
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.unwrap());
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let cb = self.acard
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.borrow()
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.cb
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.clone();
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{
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let mut ac = self.acard.borrow_mut();
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*ac = AlsaCard::new(card_name, elem_name, cb)?;
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}
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// invoke_handlers(&self.handlers.borrow(),
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// AudioSignal::CardCleanedUp,
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// user);
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invoke_handlers(&self.handlers.borrow(),
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AudioSignal::CardInitialized,
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user);
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return Ok(());
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}
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pub fn vol(&self) -> Result<f64> {
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let alsa_vol = self.acard
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.borrow()
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.get_vol()?;
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return vol_to_percent(alsa_vol, self.acard.borrow().get_volume_range());
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}
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pub fn vol_level(&self) -> VolLevel {
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let muted = self.get_mute().unwrap_or(false);
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if muted {
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return VolLevel::Muted;
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}
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let cur_vol = try_r!(self.vol(), VolLevel::Muted);
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match cur_vol {
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0. => return VolLevel::Off,
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0.0...33.0 => return VolLevel::Low,
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0.0...66.0 => return VolLevel::Medium,
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0.0...100.0 => return VolLevel::High,
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_ => return VolLevel::Off,
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}
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}
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pub fn set_vol(&self,
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new_vol: f64,
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user: AudioUser,
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dir: VolDir,
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auto_unmute: bool)
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-> Result<()> {
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{
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let mut rc = self.last_action_timestamp.borrow_mut();
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*rc = glib::get_monotonic_time();
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}
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let alsa_vol = percent_to_vol(new_vol,
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self.acard.borrow().get_volume_range(),
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dir)?;
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/* only invoke handlers etc. if volume did actually change */
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{
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let old_alsa_vol =
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percent_to_vol(self.vol()?,
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self.acard.borrow().get_volume_range(),
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dir)?;
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if old_alsa_vol == alsa_vol {
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return Ok(());
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}
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}
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/* auto-unmute */
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if auto_unmute && self.has_mute() && self.get_mute()? {
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self.set_mute(false, user)?;
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}
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debug!("Setting vol on card {:?} and chan {:?} to {:?} by user {:?}",
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self.acard
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.borrow()
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.card_name()
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.unwrap(),
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self.acard
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.borrow()
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.chan_name()
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.unwrap(),
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new_vol,
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user);
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self.acard
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.borrow()
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.set_vol(alsa_vol)?;
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invoke_handlers(&self.handlers.borrow(),
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AudioSignal::ValuesChanged,
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user);
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return Ok(());
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}
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pub fn increase_vol(&self,
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user: AudioUser,
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auto_unmute: bool)
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-> Result<()> {
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let old_vol = self.vol()?;
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let new_vol = old_vol + (self.scroll_step.get() as f64);
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return self.set_vol(new_vol, user, VolDir::Up, auto_unmute);
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}
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pub fn decrease_vol(&self,
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user: AudioUser,
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auto_unmute: bool)
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-> Result<()> {
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let old_vol = self.vol()?;
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let new_vol = old_vol - (self.scroll_step.get() as f64);
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return self.set_vol(new_vol, user, VolDir::Down, auto_unmute);
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}
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pub fn has_mute(&self) -> bool {
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return self.acard.borrow().has_mute();
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}
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pub fn get_mute(&self) -> Result<bool> {
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return self.acard.borrow().get_mute();
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}
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pub fn set_mute(&self, mute: bool, user: AudioUser) -> Result<()> {
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let mut rc = self.last_action_timestamp.borrow_mut();
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*rc = glib::get_monotonic_time();
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debug!("Setting mute to {} on card {:?} and chan {:?} by user {:?}",
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mute,
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self.acard
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.borrow()
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.card_name()
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.unwrap(),
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self.acard
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.borrow()
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.chan_name()
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.unwrap(),
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user);
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self.acard
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.borrow()
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.set_mute(mute)?;
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invoke_handlers(&self.handlers.borrow(),
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AudioSignal::ValuesChanged,
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user);
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return Ok(());
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}
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pub fn toggle_mute(&self, user: AudioUser) -> Result<()> {
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let muted = self.get_mute()?;
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return self.set_mute(!muted, user);
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}
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pub fn connect_handler(&self, cb: Box<Fn(AudioSignal, AudioUser)>) {
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self.handlers.add_handler(cb);
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}
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}
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fn invoke_handlers(handlers: &Vec<Box<Fn(AudioSignal, AudioUser)>>,
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signal: AudioSignal,
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user: AudioUser) {
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debug!("Invoking handlers for signal {:?} by user {:?}",
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signal,
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user);
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if handlers.is_empty() {
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debug!("No handler found");
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} else {
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debug!("Executing handlers")
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}
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for handler in handlers {
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let unboxed = handler.as_ref();
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unboxed(signal, user);
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}
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}
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fn on_alsa_event(last_action_timestamp: &mut i64,
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handlers: &Vec<Box<Fn(AudioSignal, AudioUser)>>,
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alsa_event: AlsaEvent) {
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let last: i64 = *last_action_timestamp;
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if last != 0 {
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let now: i64 = glib::get_monotonic_time();
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let delay: i64 = now - last;
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if delay < 1000000 {
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return;
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}
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debug!("Discarding last time stamp, too old");
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*last_action_timestamp = 0;
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}
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/* external change */
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match alsa_event {
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AlsaEvent::AlsaCardError => {
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invoke_handlers(handlers,
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self::AudioSignal::CardError,
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self::AudioUser::Unknown);
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}
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AlsaEvent::AlsaCardDiconnected => {
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invoke_handlers(handlers,
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self::AudioSignal::CardDisconnected,
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self::AudioUser::Unknown);
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}
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AlsaEvent::AlsaCardValuesChanged => {
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invoke_handlers(handlers,
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self::AudioSignal::ValuesChanged,
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self::AudioUser::Unknown);
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}
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e => warn!("Unhandled alsa event: {:?}", e),
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}
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}
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