feat: 支持设置音量。

src-tauri/src/volume/manager.rs

@@ -0,0 +1,101 @@
+use std::{
+    mem,
+    sync::{Arc, RwLock},
+};
+
+use coreaudio::{
+    audio_unit::macos_helpers::get_default_device_id,
+    sys::{
+        kAudioHardwareServiceDeviceProperty_VirtualMasterVolume, kAudioObjectPropertyScopeOutput,
+        AudioObjectHasProperty, AudioObjectPropertyAddress, AudioObjectSetPropertyData,
+    },
+};
+use paris::error;
+use tokio::sync::OnceCell;
+
+use crate::rpc::BoardMessageChannels;
+
+pub struct VolumeManager {
+    current_volume: Arc<RwLock<f32>>,
+    handler: Option<tokio::task::JoinHandle<()>>,
+}
+
+impl VolumeManager {
+    pub async fn global() -> &'static Self {
+        static VOLUME_MANAGER: OnceCell<VolumeManager> = OnceCell::const_new();
+
+        VOLUME_MANAGER
+            .get_or_init(|| async { Self::create() })
+            .await
+    }
+
+    pub fn create() -> Self {
+        let mut instance = Self {
+            current_volume: Arc::new(RwLock::new(0.0)),
+            handler: None,
+        };
+
+        instance.subscribe_volume_setting_request();
+
+        instance
+    }
+
+    fn subscribe_volume_setting_request(&mut self) {
+        let handler = tokio::spawn(async {
+            let channels = BoardMessageChannels::global().await;
+            let mut request_rx = channels.volume_setting_request_sender.subscribe();
+
+            while let Ok(volume) = request_rx.recv().await {
+                if let Err(err) = Self::set_volume(volume) {
+                    error!("failed to set volume: {}", err);
+                }
+            }
+        });
+
+        self.handler = Some(handler);
+    }
+
+    fn set_volume(volume: f32) -> anyhow::Result<()> {
+        log::debug!("set volume: {}", volume);
+
+        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 size = mem::size_of::<f32>() as u32;
+
+        let result = unsafe {
+            AudioObjectSetPropertyData(
+                device_id,
+                &address,
+                0,
+                std::ptr::null(),
+                size,
+                &volume as *const f32 as *const std::ffi::c_void,
+            )
+        };
+
+        if result != 0 {
+            anyhow::bail!("Can not set audio property");
+        }
+
+        Ok(())
+    }
+}

src-tauri/src/volume/mod.rs

@@ -0,0 +1,3 @@
+mod manager;
+
+pub use manager::*;