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fix(audio): fall back to ALSA visualizer capture #959
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,54 @@ | ||
| // Linux with both capture backends: PipeWire's sink monitor first, and an ALSA | ||
| // monitor or loopback device through cpal when no PipeWire server answers. On | ||
| // PulseAudio without PipeWire that means a monitor defined as an ALSA PCM, as | ||
| // in a proot container on Android. The fallback never opens the default input, | ||
| // which can be a microphone. | ||
|
|
||
| use super::analyzer::{RecentAudio, SpectrumData}; | ||
| use super::capture::AudioCaptureManager as CpalCapture; | ||
| use super::pipewire_capture::PipeWireCapture; | ||
|
|
||
| pub enum AudioCaptureManager { | ||
| PipeWire(PipeWireCapture), | ||
| Cpal(CpalCapture), | ||
| } | ||
|
|
||
| impl AudioCaptureManager { | ||
| /// Opens PipeWire capture, or an ALSA monitor or loopback device when PipeWire fails to start. | ||
| pub fn new(display_bars: usize) -> Option<Self> { | ||
| PipeWireCapture::new(display_bars) | ||
| .map(Self::PipeWire) | ||
| .or_else(|| { | ||
| log::info!("[audio-viz] trying an ALSA monitor or loopback device instead of PipeWire"); | ||
| let capture = CpalCapture::new_monitor_only(display_bars); | ||
| if capture.is_none() { | ||
| log::warn!( | ||
| "[audio-viz] no ALSA monitor or loopback device; the default input is not used" | ||
| ); | ||
| } | ||
| capture.map(Self::Cpal) | ||
| }) | ||
| } | ||
|
|
||
| pub fn get_spectrum(&self, desired_bars: usize) -> Option<SpectrumData> { | ||
| match self { | ||
| Self::PipeWire(capture) => capture.get_spectrum(desired_bars), | ||
| Self::Cpal(capture) => capture.get_spectrum(desired_bars), | ||
| } | ||
| } | ||
|
|
||
| #[cfg_attr(not(feature = "gui"), allow(dead_code))] | ||
| pub fn recent_audio(&self) -> Option<RecentAudio> { | ||
| match self { | ||
| Self::PipeWire(capture) => capture.recent_audio(), | ||
| Self::Cpal(capture) => capture.recent_audio(), | ||
| } | ||
| } | ||
|
|
||
| pub fn is_active(&self) -> bool { | ||
| match self { | ||
| Self::PipeWire(capture) => capture.is_active(), | ||
| Self::Cpal(capture) => capture.is_active(), | ||
| } | ||
| } | ||
| } | ||
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