Fix iOS compilation error and add macOS + iOS feedback example applic…

…ations

.travis.yml

@@ -13,13 +13,17 @@ env:
   - LD_LIBRARY_PATH: /usr/local/lib
   global:
   - secure: URNNlOqxnfwWDC/w4PDTCswqe9ccnkIqDwfQecppfEui4KhpYXfrG9gx3xupWzWMfX+NPEcXtiyWA4CuUYaHbWWINLeLQUk650AFEqaRSiTpeh45Y9nh3dHT4fFDz4OeNfayNBBKL0kx5YwrugoeQggIgnF2KEcIHMF0+BbTtAM=
+install:
+- rustup target add aarch64-apple-ios x86_64-apple-ios
 before_script:
 - rustc --version
 - cargo --version
 script:
 - cargo build --verbose
 - cargo test --verbose
 - cargo doc --verbose
+- cargo build --verbose --target aarch64-apple-ios
+- cargo build --verbose --target x86_64-apple-ios
 after_success: |
   [ $TRAVIS_BRANCH = master ] &&
   [ $TRAVIS_PULL_REQUEST = false ] &&

examples/feedback.rs

@@ -0,0 +1,214 @@
+//! A basic input + output stream example, copying the mic input stream to the default output stream
+
+extern crate coreaudio;
+
+use std::collections::VecDeque;
+use std::mem;
+use std::ptr::null;
+use std::sync::{Arc, Mutex};
+
+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::*;
+
+const SAMPLE_RATE: f64 = 44100.0;
+
+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;
+
+fn main() -> Result<(), coreaudio::Error> {
+    let mut input_audio_unit = audio_unit_from_device(default_input_device().unwrap(), true)?;
+    let mut output_audio_unit = audio_unit_from_device(default_output_device().unwrap(), false)?;
+
+    let format_flag = match SAMPLE_FORMAT {
+        SampleFormat::F32 => LinearPcmFlags::IS_FLOAT,
+        SampleFormat::I32 | SampleFormat::I16 | SampleFormat::I8 => LinearPcmFlags::IS_SIGNED_INTEGER,
+    };
+
+    // Using IS_NON_INTERLEAVED everywhere because data::Interleaved is commented out / not implemented
+    let in_stream_format = StreamFormat {
+        sample_rate: SAMPLE_RATE,
+        sample_format: SAMPLE_FORMAT,
+        flags: format_flag | LinearPcmFlags::IS_PACKED | LinearPcmFlags::IS_NON_INTERLEAVED,
+        // audio_unit.set_input_callback is hardcoded to 1 buffer, and when using non_interleaved
+        // we are forced to 1 channel
+        channels_per_frame: 1,
+    };
+
+    let out_stream_format = StreamFormat {
+        sample_rate: SAMPLE_RATE,
+        sample_format: SAMPLE_FORMAT,
+        flags: format_flag | LinearPcmFlags::IS_PACKED | LinearPcmFlags::IS_NON_INTERLEAVED,
+        // you can change this to 1
+        channels_per_frame: 2,
+    };
+
+    println!("input={:#?}", &in_stream_format);
+    println!("output={:#?}", &out_stream_format);
+    println!("input_asbd={:#?}", &in_stream_format.to_asbd());
+    println!("output_asbd={:#?}", &out_stream_format.to_asbd());
+
+    let id = kAudioUnitProperty_StreamFormat;
+    let asbd = in_stream_format.to_asbd();
+    input_audio_unit.set_property(id, Scope::Output, Element::Input, Some(&asbd))?;
+
+    let asbd = out_stream_format.to_asbd();
+    output_audio_unit.set_property(id, Scope::Input, Element::Output, Some(&asbd))?;
+
+    let buffer_left = Arc::new(Mutex::new(VecDeque::<S>::new()));
+    let producer_left = buffer_left.clone();
+    let consumer_left = buffer_left.clone();
+    let buffer_right = Arc::new(Mutex::new(VecDeque::<S>::new()));
+    let producer_right = buffer_right.clone();
+    let consumer_right = buffer_right.clone();
+
+    // seed roughly 1 second of data to create a delay in the feedback loop for easier testing
+    for buffer in vec![buffer_left, buffer_right] {
+        let mut buffer = buffer.lock().unwrap();
+        for _ in 0..(out_stream_format.sample_rate as i32) {
+            buffer.push_back(0 as S);
+        }
+    }
+
+    type Args = render_callback::Args<data::NonInterleaved<S>>;
+
+    input_audio_unit.set_input_callback(move |args| {
+        let Args {
+            num_frames,
+            mut data,
+            ..
+        } = args;
+        let buffer_left = producer_left.lock().unwrap();
+        let buffer_right = producer_right.lock().unwrap();
+        let mut buffers = vec![buffer_left, buffer_right];
+        for i in 0..num_frames {
+            for (ch, channel) in data.channels_mut().enumerate() {
+                let value: S = channel[i];
+                buffers[ch].push_back(value);
+            }
+        }
+        Ok(())
+    })?;
+    input_audio_unit.start()?;
+
+    output_audio_unit.set_render_callback(move |args: Args| {
+        let Args {
+            num_frames,
+            mut data,
+            ..
+        } = args;
+
+        let buffer_left = consumer_left.lock().unwrap();
+        let buffer_right = consumer_right.lock().unwrap();
+        let mut buffers = vec![buffer_left, buffer_right];
+        for i in 0..num_frames {
+            // Default other channels to copy value from first channel as a fallback
+            let zero: S = 0 as S;
+            let f: S = *buffers[0].front().unwrap_or(&zero);
+            for (ch, channel) in data.channels_mut().enumerate() {
+                let sample: S = buffers[ch].pop_front().unwrap_or(f);
+                channel[i] = sample;
+            }
+        }
+        Ok(())
+    })?;
+    output_audio_unit.start()?;
+
+    std::thread::sleep(std::time::Duration::from_millis(100000));
+
+    Ok(())
+}
+
+/// Copied from cpal
+pub fn default_input_device() -> Option<AudioDeviceID> {
+    let property_address = AudioObjectPropertyAddress {
+        mSelector: kAudioHardwarePropertyDefaultInputDevice,
+        mScope: kAudioObjectPropertyScopeGlobal,
+        mElement: kAudioObjectPropertyElementMaster,
+    };
+
+    let audio_device_id: AudioDeviceID = 0;
+    let data_size = mem::size_of::<AudioDeviceID>();
+    let status = unsafe {
+        AudioObjectGetPropertyData(
+            kAudioObjectSystemObject,
+            &property_address as *const _,
+            0,
+            null(),
+            &data_size as *const _ as *mut _,
+            &audio_device_id as *const _ as *mut _,
+        )
+    };
+    if status != kAudioHardwareNoError as i32 {
+        return None;
+    }
+
+    Some(audio_device_id)
+}
+
+/// Copied from cpal
+pub fn default_output_device() -> Option<AudioDeviceID> {
+    let property_address = AudioObjectPropertyAddress {
+        mSelector: kAudioHardwarePropertyDefaultOutputDevice,
+        mScope: kAudioObjectPropertyScopeGlobal,
+        mElement: kAudioObjectPropertyElementMaster,
+    };
+
+    let audio_device_id: AudioDeviceID = 0;
+    let data_size = mem::size_of::<AudioDeviceID>();
+    let status = unsafe {
+        AudioObjectGetPropertyData(
+            kAudioObjectSystemObject,
+            &property_address as *const _,
+            0,
+            null(),
+            &data_size as *const _ as *mut _,
+            &audio_device_id as *const _ as *mut _,
+        )
+    };
+    if status != kAudioHardwareNoError as i32 {
+        return None;
+    }
+
+    Some(audio_device_id)
+}
+
+/// Copied from cpal
+fn audio_unit_from_device(
+    device_id: AudioDeviceID,
+    input: bool,
+) -> Result<AudioUnit, coreaudio::Error> {
+    let mut audio_unit = AudioUnit::new(coreaudio::audio_unit::IOType::HalOutput)?;
+
+    if input {
+        // Enable input processing.
+        let enable_input = 1u32;
+        audio_unit.set_property(
+            kAudioOutputUnitProperty_EnableIO,
+            Scope::Input,
+            Element::Input,
+            Some(&enable_input),
+        )?;
+
+        // Disable output processing.
+        let disable_output = 0u32;
+        audio_unit.set_property(
+            kAudioOutputUnitProperty_EnableIO,
+            Scope::Output,
+            Element::Output,
+            Some(&disable_output),
+        )?;
+    }
+
+    audio_unit.set_property(
+        kAudioOutputUnitProperty_CurrentDevice,
+        Scope::Global,
+        Element::Output,
+        Some(&device_id),
+    )?;
+
+    Ok(audio_unit)
+}

examples/ios/build_rust_deps.sh

@@ -0,0 +1,12 @@
+#!/bin/sh
+
+set -e
+
+PATH=$PATH:$HOME/.cargo/bin
+
+# If you want your build to run faster, add a "--targets x86_64-apple-ios" for just using the ios simulator.
+if [ -n ${IOS_TARGETS} ]; then
+    cargo lipo --targets ${IOS_TARGETS}
+else
+    cargo lipo
+fi