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- use super::AudioFilter;
- use super::{Mixer, MixerConfig};
- use std::error::Error;
- use alsa;
- #[derive(Clone)]
- pub struct AlsaMixer {
- config: MixerConfig,
- }
- impl AlsaMixer {
- fn map_volume(&self, set_volume: Option<u16>) -> Result<(u16), Box<dyn Error>> {
- let mixer = alsa::mixer::Mixer::new(&self.config.card, false)?;
- let sid = alsa::mixer::SelemId::new(&*self.config.mixer, self.config.index);
- let selem = mixer.find_selem(&sid).expect(
- format!(
- "Couldn't find simple mixer control for {}",
- self.config.mixer
- )
- .as_str(),
- );
- let (min, max) = selem.get_playback_volume_range();
- let range = (max - min) as f64;
- let new_vol: u16;
- if let Some(vol) = set_volume {
- let alsa_volume: i64 = ((vol as f64 / 0xFFFF as f64) * range) as i64 + min;
- debug!("Mapping volume {:?} ->> alsa {:?}", vol, alsa_volume);
- selem
- .set_playback_volume_all(alsa_volume)
- .expect("Couldn't set alsa volume");
- new_vol = vol;
- } else {
- let cur_vol = selem
- .get_playback_volume(alsa::mixer::SelemChannelId::mono())
- .expect("Couldn't get current volume");
- new_vol = (((cur_vol - min) as f64 / range) * 0xFFFF as f64) as u16;
- debug!("Mapping volume {:?} <<- alsa {:?}", new_vol, cur_vol);
- }
- Ok(new_vol)
- }
- }
- impl Mixer for AlsaMixer {
- fn open(config: Option<MixerConfig>) -> AlsaMixer {
- let config = config.unwrap_or_default();
- info!(
- "Setting up new mixer: card:{} mixer:{} index:{}",
- config.card, config.mixer, config.index
- );
- AlsaMixer { config: config }
- }
- fn start(&self) {}
- fn stop(&self) {}
- fn volume(&self) -> u16 {
- match self.map_volume(None) {
- Ok(vol) => vol,
- Err(e) => {
- error!("Error getting volume for <{}>, {:?}", self.config.card, e);
- 0
- }
- }
- }
- fn set_volume(&self, volume: u16) {
- match self.map_volume(Some(volume)) {
- Ok(_) => (),
- Err(e) => error!("Error setting volume for <{}>, {:?}", self.config.card, e),
- }
- }
- fn get_audio_filter(&self) -> Option<Box<dyn AudioFilter + Send>> {
- None
- }
- }
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