feat: 当新板子上线或音量变化时，推送当前音量给板子。

src-tauri/src/volume/manager.rs

@@ -1,23 +1,22 @@
-use std::{
-    mem,
-    sync::{Arc, RwLock},
-};
+use std::{mem, sync::Arc};
 
 use coreaudio::{
     audio_unit::macos_helpers::get_default_device_id,
     sys::{
         kAudioHardwareServiceDeviceProperty_VirtualMasterVolume, kAudioObjectPropertyScopeOutput,
-        AudioObjectHasProperty, AudioObjectPropertyAddress, AudioObjectSetPropertyData,
+        AudioObjectGetPropertyData, AudioObjectHasProperty, AudioObjectPropertyAddress,
+        AudioObjectSetPropertyData,
     },
 };
 use paris::error;
-use tokio::sync::OnceCell;
+use tokio::sync::{OnceCell, RwLock};
 
 use crate::rpc::BoardMessageChannels;
 
 pub struct VolumeManager {
     current_volume: Arc<RwLock<f32>>,
     handler: Option<tokio::task::JoinHandle<()>>,
+    read_handler: Option<tokio::task::JoinHandle<()>>,
 }
 
 impl VolumeManager {
@@ -33,9 +32,11 @@ impl VolumeManager {
         let mut instance = Self {
             current_volume: Arc::new(RwLock::new(0.0)),
             handler: None,
+            read_handler: None,
         };
 
         instance.subscribe_volume_setting_request();
+        instance.auto_read_volume();
 
         instance
     }
@@ -55,6 +56,36 @@ impl VolumeManager {
         self.handler = Some(handler);
     }
 
+    fn auto_read_volume(&mut self) {
+        let current_volume = self.current_volume.clone();
+
+        let handler = tokio::spawn(async move {
+            let channel = BoardMessageChannels::global().await;
+            let volume_changed_tx = channel.volume_changed_sender.clone();
+            loop {
+                match Self::read_volume() {
+                    Ok(value) => {
+                        let mut volume = current_volume.write().await;
+                        if *volume != value {
+                            if let Err(err) = volume_changed_tx.send(value) {
+                                error!("failed to send volume changed event: {}", err);
+                            }
+                        }
+
+                        *volume = value;
+                    }
+                    Err(err) => {
+                        error!("failed to read volume: {}", err);
+                    }
+                }
+
+                tokio::time::sleep(std::time::Duration::from_secs(10)).await;
+            }
+        });
+
+        self.read_handler = Some(handler);
+    }
+
     fn set_volume(volume: f32) -> anyhow::Result<()> {
         log::debug!("set volume: {}", volume);
 
@@ -98,4 +129,75 @@ impl VolumeManager {
 
         Ok(())
     }
+
+    fn read_volume() -> anyhow::Result<f32> {
+        let device_id = get_default_device_id(false);
+
+        if device_id.is_none() {
+            anyhow::bail!("default audio output device is not found.");
+        }
+
+        let device_id = device_id.unwrap();
+
+        let address = AudioObjectPropertyAddress {
+            mSelector: kAudioHardwareServiceDeviceProperty_VirtualMasterVolume,
+            mScope: kAudioObjectPropertyScopeOutput,
+            mElement: 0,
+        };
+
+        log::debug!("device id: {}", device_id);
+        log::debug!("address: {:?}", address);
+
+        if 0 == unsafe { AudioObjectHasProperty(device_id, &address) } {
+            anyhow::bail!("Can not get audio property");
+        }
+
+        let mut size = mem::size_of::<f32>() as u32;
+
+        let mut volume = 0.0f32;
+
+        let result = unsafe {
+            AudioObjectGetPropertyData(
+                device_id,
+                &address,
+                0,
+                std::ptr::null(),
+                &mut size,
+                &mut volume as *mut f32 as *mut std::ffi::c_void,
+            )
+        };
+
+        if result != 0 {
+            anyhow::bail!("Can not get audio property. result: {}", result);
+        }
+
+        if size != mem::size_of::<f32>() as u32 {
+            anyhow::bail!("Can not get audio property. data size is not matched.");
+        }
+
+        log::debug!("current system volume of primary device: {}", volume);
+
+        Ok(volume)
+    }
+
+    pub async fn get_volume(&self) -> f32 {
+        self.current_volume.read().await.clone()
+    }
+}
+
+impl Drop for VolumeManager {
+    fn drop(&mut self) {
+        log::info!("drop volume manager");
+        if let Some(handler) = self.handler.take() {
+            tokio::task::block_in_place(move || {
+                handler.abort();
+            });
+        }
+
+        if let Some(handler) = self.read_handler.take() {
+            tokio::task::block_in_place(move || {
+                handler.abort();
+            });
+        }
+    }
 }