feat: white noise source

Cargo.toml

@@ -12,4 +12,5 @@ keywords = ["audio", "ambisonics", "3D", "sound", "gamedev"]
 
 [dependencies]
 cpal = "0.8"
-rodio = "0.8"
+rodio = "0.8"
+rand = "0.5"

src/sources/mod.rs

@@ -0,0 +1,3 @@
+mod noise;
+
+pub use self::noise::Noise;

src/sources/noise.rs

@@ -0,0 +1,45 @@
+use rand::{
+    distributions::{Distribution, StandardNormal}, thread_rng,
+};
+use rodio::Source;
+use std::time::Duration;
+
+pub struct Noise {
+    sample_rate: u32,
+}
+
+impl Noise {
+    pub fn new(sample_rate: u32) -> Self {
+        Noise { sample_rate }
+    }
+}
+
+impl Iterator for Noise {
+    type Item = f32;
+
+    fn next(&mut self) -> Option<f32> {
+        Some(StandardNormal.sample(&mut thread_rng()) as f32)
+    }
+}
+
+impl Source for Noise {
+    #[inline(always)]
+    fn current_frame_len(&self) -> Option<usize> {
+        None
+    }
+
+    #[inline(always)]
+    fn channels(&self) -> u16 {
+        1
+    }
+
+    #[inline(always)]
+    fn sample_rate(&self) -> u32 {
+        self.sample_rate
+    }
+
+    #[inline(always)]
+    fn total_duration(&self) -> Option<Duration> {
+        None
+    }
+}