Add: src/main.rs for a binary to test audio with `cargo run`

2 files changed, 85 insertions, 76 deletions

diff --git a/klangfarbrs/src/lib.rs b/klangfarbrs/src/lib.rs
index 2dbc299..0da53b2 100644
--- a/klangfarbrs/src/lib.rs
+++ b/klangfarbrs/src/lib.rs
@@ -1,10 +1,5 @@
 use gdnative::api::Resource;
 use gdnative::prelude::*;
-use cpal;
-use cpal::traits::{DeviceTrait, HostTrait, StreamTrait};
-use dasp::{Sample};
-use dasp_signal::{self as signal, Signal};
-use std::sync::mpsc;
 
 /// The HelloWorld "class"
 #[derive(NativeClass)]
@@ -49,86 +44,95 @@ impl Synth {
     #[export]
     fn _ready(&self, _owner: &Node) {
         godot_print!("POOOP");
-       play();
+        test::test();
     }
 }
 
-fn play() -> Result<(), anyhow::Error> {
-    let host = cpal::default_host();
-    let device = host
-        .default_output_device()
-        .expect("failed to find a default output device");
-    let config = device.default_output_config()?;
-
-    match config.sample_format() {
-        cpal::SampleFormat::F32 => run::<f32>(&device, &config.into())?,
-        cpal::SampleFormat::I16 => run::<i16>(&device, &config.into())?,
-        cpal::SampleFormat::U16 => run::<u16>(&device, &config.into())?,
-    }
+pub mod test {
+    use cpal;
+    use cpal::traits::{DeviceTrait, HostTrait, StreamTrait};
+    use dasp::{Sample};
+    use dasp_signal::{self as signal, Signal};
+    use std::sync::mpsc;
+
+    pub fn test() -> Result<(), anyhow::Error> {
+        let host = cpal::default_host();
+        let device = host
+            .default_output_device()
+            .expect("failed to find a default output device");
+        let config = device.default_output_config()?;
+
+        match config.sample_format() {
+            cpal::SampleFormat::F32 => run::<f32>(&device, &config.into())?,
+            cpal::SampleFormat::I16 => run::<i16>(&device, &config.into())?,
+            cpal::SampleFormat::U16 => run::<u16>(&device, &config.into())?,
+        }
 
-    Ok(())
-}
+        Ok(())
+    }
 
-fn run<T>(device: &cpal::Device, config: &cpal::StreamConfig) -> Result<(), anyhow::Error>
-where
-    T: cpal::Sample,
-{
-    // Create a signal chain to play back 1 second of each oscillator at A4.
-    let hz = signal::rate(config.sample_rate.0 as f64).const_hz(440.0);
-    let one_sec = config.sample_rate.0 as usize;
-    let mut synth = hz
-        .clone()
-        .sine()
-        .take(one_sec)
-        .chain(hz.clone().saw().take(one_sec))
-        .chain(hz.clone().square().take(one_sec))
-        .chain(hz.clone().noise_simplex().take(one_sec))
-        .chain(signal::noise(0).take(one_sec))
-        .map(|s| s.to_sample::<f32>() * 0.2);
-
-    // A channel for indicating when playback has completed.
-    let (complete_tx, complete_rx) = mpsc::sync_channel(1);
-
-    // Create and run the stream.
-    let err_fn = |err| eprintln!("an error occurred on stream: {}", err);
-    let channels = config.channels as usize;
-    let stream = device.build_output_stream(
-        config,
-        move |data: &mut [T], _: &cpal::OutputCallbackInfo| {
-            write_data(data, channels, &complete_tx, &mut synth)
-        },
-        err_fn,
-    )?;
-    stream.play()?;
-
-    // Wait for playback to complete.
-    complete_rx.recv().unwrap();
-    stream.pause()?;
-
-    Ok(())
-}
+    fn run<T>(device: &cpal::Device, config: &cpal::StreamConfig) -> Result<(), anyhow::Error>
+    where
+        T: cpal::Sample,
+    {
+        // Create a signal chain to play back 1 second of each oscillator at A4.
+        let hz = signal::rate(config.sample_rate.0 as f64).const_hz(440.0);
+        let one_sec = config.sample_rate.0 as usize;
+        let mut synth = hz
+            .clone()
+            .sine()
+            .take(one_sec)
+            .chain(hz.clone().saw().take(one_sec))
+            .chain(hz.clone().square().take(one_sec))
+            .chain(hz.clone().noise_simplex().take(one_sec))
+            .chain(signal::noise(0).take(one_sec))
+            .map(|s| s.to_sample::<f32>() * 0.2);
+
+        // A channel for indicating when playback has completed.
+        let (complete_tx, complete_rx) = mpsc::sync_channel(1);
+
+        // Create and run the stream.
+        let err_fn = |err| eprintln!("an error occurred on stream: {}", err);
+        let channels = config.channels as usize;
+        let stream = device.build_output_stream(
+            config,
+            move |data: &mut [T], _: &cpal::OutputCallbackInfo| {
+                write_data(data, channels, &complete_tx, &mut synth)
+            },
+            err_fn,
+        )?;
+        stream.play()?;
+
+        // Wait for playback to complete.
+        complete_rx.recv().unwrap();
+        stream.pause()?;
+
+        Ok(())
+    }
 
-fn write_data<T>(
-    output: &mut [T],
-    channels: usize,
-    complete_tx: &mpsc::SyncSender<()>,
-    signal: &mut dyn Iterator<Item = f32>,
-) where
-    T: cpal::Sample,
-{
-    for frame in output.chunks_mut(channels) {
-        let sample = match signal.next() {
-            None => {
-                complete_tx.try_send(()).ok();
-                0.0
+    fn write_data<T>(
+        output: &mut [T],
+        channels: usize,
+        complete_tx: &mpsc::SyncSender<()>,
+        signal: &mut dyn Iterator<Item = f32>,
+    ) where
+        T: cpal::Sample,
+    {
+        for frame in output.chunks_mut(channels) {
+            let sample = match signal.next() {
+                None => {
+                    complete_tx.try_send(()).ok();
+                    0.0
+                }
+                Some(sample) => sample,
+            };
+            let value: T = cpal::Sample::from::<f32>(&sample);
+            for sample in frame.iter_mut() {
+                *sample = value;
             }
-            Some(sample) => sample,
-        };
-        let value: T = cpal::Sample::from::<f32>(&sample);
-        for sample in frame.iter_mut() {
-            *sample = value;
         }
     }
+
 }
 
 // Function that registers all exposed classes to Godot
diff --git a/klangfarbrs/src/main.rs b/klangfarbrs/src/main.rs
new file mode 100644
index 0000000..066cd9d
--- /dev/null
+++ b/klangfarbrs/src/main.rs
@@ -0,0 +1,5 @@
+use klangfarbrs::test::test;
+
+fn main() {
+    test();
+}