fix(native): audio capture volume (#11240)

packages/frontend/media-capture-playground/server/main.ts

@@ -524,10 +524,13 @@ async function getAllApps(): Promise<AppInfo[]> {
     }
   });
 
-  const filteredApps = apps.filter(
-    (v): v is AppInfo =>
-      v !== null && !v.bundleIdentifier.startsWith('com.apple')
-  );
+  const filteredApps = apps.filter((v): v is AppInfo => {
+    return (
+      v !== null &&
+      (!v.bundleIdentifier.startsWith('com.apple') ||
+        v.bundleIdentifier === 'com.apple.Music')
+    );
+  });
 
   for (const app of filteredApps) {
     if (filteredApps.some(a => a.processId === app.processGroupId)) {

packages/frontend/native/media_capture/src/macos/audio_buffer.rs

@@ -98,12 +98,11 @@ impl InputAndOutputAudioBufferList {
       .max(processed_samples_output.len());
 
     let mut mixed_samples = vec![0.0; mixed_samples_length];
-
     for (sample_index, mixed_sample) in mixed_samples.iter_mut().enumerate() {
       let sample_in = processed_samples_input.get(sample_index).unwrap_or(&0.0);
       let sample_out = processed_samples_output.get(sample_index).unwrap_or(&0.0);
 
-      *mixed_sample = (sample_in + sample_out) / 2.0;
+      *mixed_sample = sample_in + sample_out;
     }
 
     Ok(mixed_samples)

packages/frontend/native/media_capture/src/macos/cf_types.rs

@@ -18,12 +18,24 @@ impl ToCoreFoundation for CFString {
   }
 }
 
+impl ToCoreFoundation for &CFString {
+  fn to_cf(&self) -> CFType {
+    self.as_CFType()
+  }
+}
+
 impl ToCoreFoundation for String {
   fn to_cf(&self) -> CFType {
     CFString::new(self).as_CFType()
   }
 }
 
+impl ToCoreFoundation for &str {
+  fn to_cf(&self) -> CFType {
+    CFString::new(self).as_CFType()
+  }
+}
+
 impl ToCoreFoundation for bool {
   fn to_cf(&self) -> CFType {
     if *self {

packages/frontend/native/media_capture/src/macos/screen_capture_kit.rs

@@ -16,9 +16,8 @@ use core_foundation::{
 use coreaudio::sys::{
   kAudioHardwarePropertyProcessObjectList, kAudioObjectPropertyElementMain,
   kAudioObjectPropertyScopeGlobal, kAudioObjectSystemObject, kAudioProcessPropertyBundleID,
-  kAudioProcessPropertyIsRunning, kAudioProcessPropertyIsRunningInput, kAudioProcessPropertyPID,
-  AudioObjectAddPropertyListenerBlock, AudioObjectID, AudioObjectPropertyAddress,
-  AudioObjectRemovePropertyListenerBlock,
+  kAudioProcessPropertyIsRunning, kAudioProcessPropertyPID, AudioObjectAddPropertyListenerBlock,
+  AudioObjectID, AudioObjectPropertyAddress, AudioObjectRemovePropertyListenerBlock,
 };
 use libc;
 use napi::{
@@ -204,8 +203,8 @@ impl Application {
   }
 
   #[napi(getter)]
-  pub fn name(&self) -> String {
-    self.name.clone()
+  pub fn name(&self) -> &str {
+    &self.name
   }
 
   #[napi(getter)]
@@ -423,7 +422,7 @@ impl TappableApplication {
   pub fn get_is_running(&self) -> Result<bool> {
     // Use catch_unwind to prevent any panics
     let result = std::panic::catch_unwind(|| {
-      match get_process_property(&self.object_id, kAudioProcessPropertyIsRunningInput) {
+      match get_process_property(&self.object_id, kAudioProcessPropertyIsRunning) {
         Ok(is_running) => Ok(is_running),
         Err(_) => Ok(false),
       }

packages/frontend/native/media_capture/src/macos/tap_audio.rs

@@ -14,7 +14,7 @@ use coreaudio::sys::{
   kAudioAggregateDeviceTapAutoStartKey, kAudioAggregateDeviceTapListKey,
   kAudioAggregateDeviceUIDKey, kAudioDevicePropertyNominalSampleRate, kAudioHardwareBadDeviceError,
   kAudioHardwareBadStreamError, kAudioHardwareNoError, kAudioHardwarePropertyDefaultInputDevice,
-  kAudioHardwarePropertyDefaultSystemOutputDevice, kAudioSubDeviceUIDKey, kAudioSubTapUIDKey,
+  kAudioHardwarePropertyDefaultOutputDevice, kAudioSubDeviceUIDKey, kAudioSubTapUIDKey,
   AudioDeviceCreateIOProcIDWithBlock, AudioDeviceDestroyIOProcID, AudioDeviceIOProcID,
   AudioDeviceStart, AudioDeviceStop, AudioHardwareCreateAggregateDevice,
   AudioHardwareDestroyAggregateDevice, AudioObjectID, AudioTimeStamp, OSStatus,
@@ -31,7 +31,7 @@ use crate::{
   audio_buffer::InputAndOutputAudioBufferList,
   ca_tap_description::CATapDescription,
   cf_types::CFDictionaryBuilder,
-  device::{get_device_audio_id, get_device_uid},
+  device::get_device_uid,
   error::CoreAudioError,
   queue::create_audio_tap_queue,
   screen_capture_kit::TappableApplication,
@@ -59,7 +59,7 @@ pub struct AggregateDevice {
   pub id: AudioObjectID,
   pub audio_stats: Option<AudioStats>,
   pub input_device_id: AudioObjectID,
-  pub output_device_id: Option<AudioObjectID>,
+  pub output_device_id: AudioObjectID,
   pub input_proc_id: Option<AudioDeviceIOProcID>,
   pub output_proc_id: Option<AudioDeviceIOProcID>,
 }
@@ -80,8 +80,15 @@ impl AggregateDevice {
     let (input_device_id, default_input_uid) =
       get_device_uid(kAudioHardwarePropertyDefaultInputDevice)?;
 
-    let description_dict =
-      Self::create_aggregate_description(tap_id, tap_description.get_uuid()?, default_input_uid)?;
+    // Get the default output device ID
+    let (output_device_id, output_device_uid) =
+      get_device_uid(kAudioHardwarePropertyDefaultOutputDevice)?;
+    let description_dict = Self::create_aggregate_description(
+      tap_id,
+      tap_description.get_uuid()?,
+      default_input_uid,
+      output_device_uid,
+    )?;
 
     let mut aggregate_device_id: AudioObjectID = 0;
 
@@ -101,7 +108,7 @@ impl AggregateDevice {
       id: aggregate_device_id,
       audio_stats: None,
       input_device_id,
-      output_device_id: None,
+      output_device_id,
       input_proc_id: None,
       output_proc_id: None,
     })
@@ -122,10 +129,15 @@ impl AggregateDevice {
       get_device_uid(kAudioHardwarePropertyDefaultInputDevice)?;
 
     // Get the default output device ID
-    let output_device_id = get_device_audio_id(kAudioHardwarePropertyDefaultSystemOutputDevice)?;
+    let (output_device_id, output_device_uid) =
+      get_device_uid(kAudioHardwarePropertyDefaultOutputDevice)?;
 
-    let description_dict =
-      Self::create_aggregate_description(tap_id, tap_description.get_uuid()?, default_input_uid)?;
+    let description_dict = Self::create_aggregate_description(
+      tap_id,
+      tap_description.get_uuid()?,
+      default_input_uid,
+      output_device_uid,
+    )?;
 
     let mut aggregate_device_id: AudioObjectID = 0;
 
@@ -147,7 +159,7 @@ impl AggregateDevice {
       id: aggregate_device_id,
       audio_stats: None,
       input_device_id,
-      output_device_id: Some(output_device_id),
+      output_device_id,
       input_proc_id: None,
       output_proc_id: None,
     };
@@ -317,24 +329,21 @@ impl AggregateDevice {
     tap_id: AudioObjectID,
     tap_uuid_string: ItemRef<CFString>,
     input_device_id: CFString,
+    output_device_id: CFString,
   ) -> Result<CFDictionary<CFType, CFType>> {
     let aggregate_device_name = CFString::new(&format!("Tap-{}", tap_id));
     let aggregate_device_uid: uuid::Uuid = CFUUID::new().into();
     let aggregate_device_uid_string = aggregate_device_uid.to_string();
 
-    let (_, output_device_uid) = get_device_uid(kAudioHardwarePropertyDefaultSystemOutputDevice)?;
-
-    let sub_device_input_dict = CFDictionary::from_CFType_pairs(&[(
-      cfstring_from_bytes_with_nul(kAudioSubDeviceUIDKey).as_CFType(),
-      input_device_id.as_CFType(),
-    )]);
+    let mut sub_device_input_dict = CFDictionaryBuilder::new();
+    sub_device_input_dict.add(kAudioSubDeviceUIDKey.as_slice(), &input_device_id);
 
     let tap_device_dict = CFDictionary::from_CFType_pairs(&[(
       cfstring_from_bytes_with_nul(kAudioSubTapUIDKey).as_CFType(),
       tap_uuid_string.as_CFType(),
     )]);
 
-    let capture_device_list = vec![sub_device_input_dict];
+    let capture_device_list = vec![sub_device_input_dict.build()];
 
     // Create the aggregate device description dictionary with a balanced
     // configuration
@@ -352,9 +361,10 @@ impl AggregateDevice {
       )
       .add(
         kAudioAggregateDeviceMainSubDeviceKey.as_slice(),
-        output_device_uid,
+        &output_device_id,
       )
       .add(kAudioAggregateDeviceIsPrivateKey.as_slice(), true)
+      // can't be stacked because we're using a tap
       .add(kAudioAggregateDeviceIsStackedKey.as_slice(), false)
       .add(kAudioAggregateDeviceTapAutoStartKey.as_slice(), true)
       .add(
@@ -381,7 +391,7 @@ pub struct AudioTapStream {
   stop_called: bool,
   audio_stats: AudioStats,
   input_device_id: AudioObjectID,
-  output_device_id: Option<AudioObjectID>,
+  output_device_id: AudioObjectID,
   input_proc_id: Option<AudioDeviceIOProcID>,
   output_proc_id: Option<AudioDeviceIOProcID>,
 }
@@ -408,11 +418,9 @@ impl AudioTapStream {
     }
 
     // Stop the output device if it was activated
-    if let Some(output_id) = self.output_device_id {
-      if let Some(proc_id) = self.output_proc_id {
-        let _ = unsafe { AudioDeviceStop(output_id, proc_id) };
-        let _ = unsafe { AudioDeviceDestroyIOProcID(output_id, proc_id) };
-      }
+    if let Some(proc_id) = self.output_proc_id {
+      let _ = unsafe { AudioDeviceStop(self.output_device_id, proc_id) };
+      let _ = unsafe { AudioDeviceDestroyIOProcID(self.output_device_id, proc_id) };
     }
 
     // Destroy the main IO proc