Use mem::MaybeUninit also for iOS

Author: HEnquist

examples/ios/src/feedback.rs

@@ -5,13 +5,13 @@ extern crate coreaudio;
 use std::collections::VecDeque;
 use std::sync::{Arc, Mutex};
 
-use coreaudio::audio_unit::{AudioUnit, Element, SampleFormat, Scope, StreamFormat};
 use coreaudio::audio_unit::audio_format::LinearPcmFlags;
 use coreaudio::audio_unit::render_callback::{self, data};
+use coreaudio::audio_unit::{AudioUnit, Element, SampleFormat, Scope, StreamFormat};
 use coreaudio::sys::*;
 
-
-type S = f32; const SAMPLE_FORMAT: SampleFormat = SampleFormat::F32;
+type S = f32;
+const SAMPLE_FORMAT: SampleFormat = SampleFormat::F32;
 // type S = i32; const SAMPLE_FORMAT: SampleFormat = SampleFormat::I32;
 // type S = i16; const SAMPLE_FORMAT: SampleFormat = SampleFormat::I16;
 // type S = i8; const SAMPLE_FORMAT: SampleFormat = SampleFormat::I8;
@@ -34,7 +34,9 @@ pub fn run_example() -> Result<(), coreaudio::Error> {
 
     let format_flag = match SAMPLE_FORMAT {
         SampleFormat::F32 => LinearPcmFlags::IS_FLOAT,
-        SampleFormat::I32 | SampleFormat::I16 | SampleFormat::I8 => LinearPcmFlags::IS_SIGNED_INTEGER,
+        SampleFormat::I32 | SampleFormat::I16 | SampleFormat::I8 => {
+            LinearPcmFlags::IS_SIGNED_INTEGER
+        }
     };
 
     // Using IS_NON_INTERLEAVED everywhere because data::Interleaved is commented out / not implemented
@@ -61,8 +63,18 @@ pub fn run_example() -> Result<(), coreaudio::Error> {
     println!("output_asbd={:#?}", &out_stream_format.to_asbd());
 
     let id = kAudioUnitProperty_StreamFormat;
-    input_audio_unit.set_property(id, Scope::Output, Element::Input, Some(&in_stream_format.to_asbd()))?;
-    output_audio_unit.set_property(id, Scope::Input, Element::Output, Some(&out_stream_format.to_asbd()))?;
+    input_audio_unit.set_property(
+        id,
+        Scope::Output,
+        Element::Input,
+        Some(&in_stream_format.to_asbd()),
+    )?;
+    output_audio_unit.set_property(
+        id,
+        Scope::Input,
+        Element::Output,
+        Some(&out_stream_format.to_asbd()),
+    )?;
 
     let buffer_left = Arc::new(Mutex::new(VecDeque::<S>::new()));
     let producer_left = buffer_left.clone();

examples/ios/src/lib.rs

@@ -2,5 +2,5 @@ mod feedback;
 
 #[no_mangle]
 pub extern "C" fn rust_ios_main() {
-  feedback::run_example().unwrap();
+    feedback::run_example().unwrap();
 }

src/audio_unit/mod.rs

@@ -424,10 +424,11 @@ pub fn get_property<T>(
 pub fn audio_session_get_property<T>(id: u32) -> Result<T, Error> {
     let mut size = ::std::mem::size_of::<T>() as u32;
     unsafe {
-        let mut data: T = ::std::mem::uninitialized();
-        let data_ptr = &mut data as *mut _ as *mut c_void;
+        let mut data_uninit = ::std::mem::MaybeUninit::<T>::uninit();
+        let data_ptr = data_uninit.as_mut_ptr() as *mut _ as *mut c_void;
         let size_ptr = &mut size as *mut _;
         try_os_status!(sys::AudioSessionGetProperty(id, size_ptr, data_ptr));
+        let data: T = data_uninit.assume_init();
         Ok(data)
     }
 }