From fc22b37f1b3641dc161bf91436ac51b94330ddff Mon Sep 17 00:00:00 2001
From: Jamie Hardt <jamiehardt@me.com>
Date: Wed, 7 Aug 2024 20:30:57 -0700
Subject: [PATCH 01/31] Implemented synthesizer waveform source

---
 src/source/mod.rs             |   2 +
 src/source/synth_waveforms.rs | 156 ++++++++++++++++++++++++++++++++++
 2 files changed, 158 insertions(+)
 create mode 100644 src/source/synth_waveforms.rs

diff --git a/src/source/mod.rs b/src/source/mod.rs
index 528e6fe8..f44df89f 100644
--- a/src/source/mod.rs
+++ b/src/source/mod.rs
@@ -30,6 +30,7 @@ pub use self::skippable::Skippable;
 pub use self::spatial::Spatial;
 pub use self::speed::Speed;
 pub use self::stoppable::Stoppable;
+pub use self::synth_waveforms::SynthWaveform;
 pub use self::take::TakeDuration;
 pub use self::uniform::UniformSourceIterator;
 pub use self::zero::Zero;
@@ -58,6 +59,7 @@ mod skippable;
 mod spatial;
 mod speed;
 mod stoppable;
+mod synth_waveforms;
 mod take;
 mod uniform;
 mod zero;
diff --git a/src/source/synth_waveforms.rs b/src/source/synth_waveforms.rs
new file mode 100644
index 00000000..b335b91a
--- /dev/null
+++ b/src/source/synth_waveforms.rs
@@ -0,0 +1,156 @@
+use std::f32::consts::TAU;
+use std::time::Duration;
+
+use super::SeekError;
+use crate::{buffer::SamplesBuffer, source::Repeat, Source};
+
+/// Syntheizer waveform functions. All of the synth waveforms are in the
+/// codomain [-1.0, 1.0].
+#[derive(Clone, Debug)]
+pub enum SynthWaveformFunction {
+    Sine,
+    Triangle,
+    Square,
+    Sawtooth,
+}
+
+impl SynthWaveformFunction {
+    /// Create a `SamplesBuffer` containing one period of `self` with the given
+    /// sample rate and frequency.
+    pub fn create_buffer(&self, sample_rate: u32, frequency: u32) -> SamplesBuffer<f32> {
+        let p: usize = (sample_rate / frequency) as usize;
+        let mut samples_vec = vec![0.0f32; p];
+
+        fn _pwm_impl(duty: f32, t: f32) -> f32 {
+            if t < duty.abs() {
+                1f32
+            } else {
+                -1f32
+            }
+        }
+
+        for i in 0..p {
+            let i_div_p: f32 = i as f32 / p as f32;
+            samples_vec[i] = match self {
+                Self::Sine => (TAU * i_div_p).sin(),
+                Self::Triangle => 4.0f32 * (i_div_p - (i_div_p + 0.5f32).floor()).abs() - 1f32,
+                Self::Square => {
+                    if i_div_p < 0.5f32 {
+                        1.0f32
+                    } else {
+                        -1.0f32
+                    }
+                }
+                Self::Sawtooth => 2.0f32 * (i_div_p - (i_div_p + 0.5f32).floor()),
+            }
+        }
+
+        SamplesBuffer::new(1, sample_rate, samples_vec)
+    }
+}
+
+/// An infinite source that produces one of a selection of synthesizer
+/// waveforms from a buffered source.
+#[derive(Clone)]
+pub struct SynthWaveform {
+    input: Repeat<SamplesBuffer<f32>>,
+}
+
+impl SynthWaveform {
+    /// Create a new `SynthWaveform` object that generates an endless waveform
+    /// `f`.
+    #[inline]
+    pub fn new(sample_rate: u32, frequency: u32, f: SynthWaveformFunction) -> SynthWaveform {
+        let buffer = f.create_buffer(sample_rate, frequency);
+        SynthWaveform {
+            input: buffer.repeat_infinite(),
+        }
+    }
+}
+
+impl Iterator for SynthWaveform {
+    type Item = f32;
+
+    #[inline]
+    fn next(&mut self) -> Option<f32> {
+        self.input.next()
+    }
+}
+
+impl Source for SynthWaveform {
+    #[inline]
+    fn current_frame_len(&self) -> Option<usize> {
+        self.input.current_frame_len()
+    }
+
+    #[inline]
+    fn channels(&self) -> u16 {
+        1
+    }
+
+    #[inline]
+    fn sample_rate(&self) -> u32 {
+        self.input.sample_rate()
+    }
+
+    #[inline]
+    fn total_duration(&self) -> Option<Duration> {
+        None
+    }
+
+    #[inline]
+    fn try_seek(&mut self, duration: Duration) -> Result<(), SeekError> {
+        self.input.try_seek(duration)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::source::synth_waveforms::*;
+
+    #[test]
+    fn square() {
+        let mut wf = SynthWaveform::new(1000, 250, SynthWaveformFunction::Square);
+        assert_eq!(wf.next(), Some(1.0f32));
+        assert_eq!(wf.next(), Some(1.0f32));
+        assert_eq!(wf.next(), Some(-1.0f32));
+        assert_eq!(wf.next(), Some(-1.0f32));
+        assert_eq!(wf.next(), Some(1.0f32));
+        assert_eq!(wf.next(), Some(1.0f32));
+        assert_eq!(wf.next(), Some(-1.0f32));
+        assert_eq!(wf.next(), Some(-1.0f32));
+    }
+
+    #[test]
+    fn triangle() {
+        let mut wf = SynthWaveform::new(8000, 1000, SynthWaveformFunction::Triangle);
+        assert_eq!(wf.next(), Some(-1.0f32));
+        assert_eq!(wf.next(), Some(-0.5f32));
+        assert_eq!(wf.next(), Some(0.0f32));
+        assert_eq!(wf.next(), Some(0.5f32));
+        assert_eq!(wf.next(), Some(1.0f32));
+        assert_eq!(wf.next(), Some(0.5f32));
+        assert_eq!(wf.next(), Some(0.0f32));
+        assert_eq!(wf.next(), Some(-0.5f32));
+        assert_eq!(wf.next(), Some(-1.0f32));
+        assert_eq!(wf.next(), Some(-0.5f32));
+        assert_eq!(wf.next(), Some(0.0f32));
+        assert_eq!(wf.next(), Some(0.5f32));
+        assert_eq!(wf.next(), Some(1.0f32));
+        assert_eq!(wf.next(), Some(0.5f32));
+        assert_eq!(wf.next(), Some(0.0f32));
+        assert_eq!(wf.next(), Some(-0.5f32));
+    }
+
+    #[test]
+    fn saw() {
+        let mut wf = SynthWaveform::new(200, 50, SynthWaveformFunction::Sawtooth);
+        assert_eq!(wf.next(), Some(0.0f32));
+        assert_eq!(wf.next(), Some(0.5f32));
+        assert_eq!(wf.next(), Some(-1.0f32));
+        assert_eq!(wf.next(), Some(-0.5f32));
+        assert_eq!(wf.next(), Some(0.0f32));
+        assert_eq!(wf.next(), Some(0.5f32));
+        assert_eq!(wf.next(), Some(-1.0f32));
+    }
+}

From 128fa745545595cb29019aad077e00c8b6e17cb0 Mon Sep 17 00:00:00 2001
From: Jamie Hardt <jamiehardt@me.com>
Date: Thu, 8 Aug 2024 16:39:35 -0700
Subject: [PATCH 02/31] More synth work, but think I'm going to startover

---
 src/source/mod.rs             |  2 +-
 src/source/synth_waveforms.rs | 89 ++++++++++++++++++++++-------------
 2 files changed, 57 insertions(+), 34 deletions(-)

diff --git a/src/source/mod.rs b/src/source/mod.rs
index f44df89f..c173ea88 100644
--- a/src/source/mod.rs
+++ b/src/source/mod.rs
@@ -30,7 +30,7 @@ pub use self::skippable::Skippable;
 pub use self::spatial::Spatial;
 pub use self::speed::Speed;
 pub use self::stoppable::Stoppable;
-pub use self::synth_waveforms::SynthWaveform;
+pub use self::synth_waveforms::{BufferedSynthWaveform, SynthWaveformFunction};
 pub use self::take::TakeDuration;
 pub use self::uniform::UniformSourceIterator;
 pub use self::zero::Zero;
diff --git a/src/source/synth_waveforms.rs b/src/source/synth_waveforms.rs
index b335b91a..ad910c03 100644
--- a/src/source/synth_waveforms.rs
+++ b/src/source/synth_waveforms.rs
@@ -4,6 +4,16 @@ use std::time::Duration;
 use super::SeekError;
 use crate::{buffer::SamplesBuffer, source::Repeat, Source};
 
+
+/// Express a frequency as a rational number.
+///     .0 Cycles per time quanta
+///     .1 Time quanta per second
+///
+/// Examples:
+///     1000,1      1000 Hz
+///     12345,100   123.45 Hz
+pub struct RationalFrequency(u32, u32);
+
 /// Syntheizer waveform functions. All of the synth waveforms are in the
 /// codomain [-1.0, 1.0].
 #[derive(Clone, Debug)]
@@ -15,60 +25,67 @@ pub enum SynthWaveformFunction {
 }
 
 impl SynthWaveformFunction {
-    /// Create a `SamplesBuffer` containing one period of `self` with the given
-    /// sample rate and frequency.
-    pub fn create_buffer(&self, sample_rate: u32, frequency: u32) -> SamplesBuffer<f32> {
-        let p: usize = (sample_rate / frequency) as usize;
-        let mut samples_vec = vec![0.0f32; p];
-
-        fn _pwm_impl(duty: f32, t: f32) -> f32 {
-            if t < duty.abs() {
-                1f32
-            } else {
-                -1f32
-            }
-        }
-
-        for i in 0..p {
-            let i_div_p: f32 = i as f32 / p as f32;
-            samples_vec[i] = match self {
-                Self::Sine => (TAU * i_div_p).sin(),
-                Self::Triangle => 4.0f32 * (i_div_p - (i_div_p + 0.5f32).floor()).abs() - 1f32,
-                Self::Square => {
+    /// Create a single sample for the given waveform
+    #[inline]
+    pub fn render(&self, sample: u32, period: u32) -> f32 {
+        let i_div_p: f32 = sample as f32 / period as f32;
+            
+        match self {
+            Self::Sine => (TAU * i_div_p).sin(),
+            Self::Triangle => 04.0f32 * (i_div_p - (i_div_p + 0.5f32).floor()).abs() - 1f32,
+            Self::Square => {
                     if i_div_p < 0.5f32 {
                         1.0f32
                     } else {
                         -1.0f32
                     }
-                }
-                Self::Sawtooth => 2.0f32 * (i_div_p - (i_div_p + 0.5f32).floor()),
-            }
+                },
+            Self::Sawtooth => 2.0f32 * (i_div_p - (i_div_p + 0.5f32).floor()),
+        }
+    }
+
+    /// Create a `SamplesBuffer` containing one period of `self` with the given
+    /// sample rate and frequency.
+    pub fn create_buffer(
+        &self,
+        sample_rate: cpal::SampleRate,
+        frequency: u32,
+    ) -> SamplesBuffer<f32> {
+        let period: usize = (sample_rate.0 / frequency) as usize;
+        let mut samples_vec = vec![0.0f32; period];
+
+        for i in 0..period {
+            samples_vec[i] = self.render(i as u32, period as u32);
         }
 
-        SamplesBuffer::new(1, sample_rate, samples_vec)
+        SamplesBuffer::new(1, sample_rate.0, samples_vec)
     }
 }
 
 /// An infinite source that produces one of a selection of synthesizer
 /// waveforms from a buffered source.
 #[derive(Clone)]
-pub struct SynthWaveform {
+pub struct BufferedSynthWaveform {
     input: Repeat<SamplesBuffer<f32>>,
 }
 
-impl SynthWaveform {
+impl BufferedSynthWaveform {
     /// Create a new `SynthWaveform` object that generates an endless waveform
     /// `f`.
     #[inline]
-    pub fn new(sample_rate: u32, frequency: u32, f: SynthWaveformFunction) -> SynthWaveform {
+    pub fn new(
+        sample_rate: cpal::SampleRate,
+        frequency: u32,
+        f: SynthWaveformFunction,
+    ) -> BufferedSynthWaveform {
         let buffer = f.create_buffer(sample_rate, frequency);
-        SynthWaveform {
+        BufferedSynthWaveform {
             input: buffer.repeat_infinite(),
         }
     }
 }
 
-impl Iterator for SynthWaveform {
+impl Iterator for BufferedSynthWaveform {
     type Item = f32;
 
     #[inline]
@@ -77,7 +94,7 @@ impl Iterator for SynthWaveform {
     }
 }
 
-impl Source for SynthWaveform {
+impl Source for BufferedSynthWaveform {
     #[inline]
     fn current_frame_len(&self) -> Option<usize> {
         self.input.current_frame_len()
@@ -110,7 +127,8 @@ mod tests {
 
     #[test]
     fn square() {
-        let mut wf = SynthWaveform::new(1000, 250, SynthWaveformFunction::Square);
+        let mut wf =
+            BufferedSynthWaveform::new(cpal::SampleRate(1000), 250, SynthWaveformFunction::Square);
         assert_eq!(wf.next(), Some(1.0f32));
         assert_eq!(wf.next(), Some(1.0f32));
         assert_eq!(wf.next(), Some(-1.0f32));
@@ -123,7 +141,11 @@ mod tests {
 
     #[test]
     fn triangle() {
-        let mut wf = SynthWaveform::new(8000, 1000, SynthWaveformFunction::Triangle);
+        let mut wf = BufferedSynthWaveform::new(
+            cpal::SampleRate(8000),
+            1000,
+            SynthWaveformFunction::Triangle,
+        );
         assert_eq!(wf.next(), Some(-1.0f32));
         assert_eq!(wf.next(), Some(-0.5f32));
         assert_eq!(wf.next(), Some(0.0f32));
@@ -144,7 +166,8 @@ mod tests {
 
     #[test]
     fn saw() {
-        let mut wf = SynthWaveform::new(200, 50, SynthWaveformFunction::Sawtooth);
+        let mut wf =
+            BufferedSynthWaveform::new(cpal::SampleRate(200), 50, SynthWaveformFunction::Sawtooth);
         assert_eq!(wf.next(), Some(0.0f32));
         assert_eq!(wf.next(), Some(0.5f32));
         assert_eq!(wf.next(), Some(-1.0f32));

From eef2edaa3deb87e3af932825aa98b69a3c2983ec Mon Sep 17 00:00:00 2001
From: Jamie Hardt <jamiehardt@me.com>
Date: Fri, 9 Aug 2024 12:40:46 -0700
Subject: [PATCH 03/31] Recent synth changes caught up with master

...and upstream.
---
 src/source/mod.rs                           |   4 +-
 src/source/{synth_waveforms.rs => synth.rs} | 113 ++++++++++----------
 2 files changed, 56 insertions(+), 61 deletions(-)
 rename src/source/{synth_waveforms.rs => synth.rs} (60%)

diff --git a/src/source/mod.rs b/src/source/mod.rs
index 2da10677..84ce2f35 100644
--- a/src/source/mod.rs
+++ b/src/source/mod.rs
@@ -32,7 +32,7 @@ pub use self::skippable::Skippable;
 pub use self::spatial::Spatial;
 pub use self::speed::Speed;
 pub use self::stoppable::Stoppable;
-pub use self::synth_waveforms::{BufferedSynthWaveform, SynthWaveformFunction};
+pub use self::synth::{SynthWaveform, SynthWaveformFunction};
 pub use self::take::TakeDuration;
 pub use self::uniform::UniformSourceIterator;
 pub use self::zero::Zero;
@@ -63,7 +63,7 @@ mod skippable;
 mod spatial;
 mod speed;
 mod stoppable;
-mod synth_waveforms;
+mod synth;
 mod take;
 mod uniform;
 mod zero;
diff --git a/src/source/synth_waveforms.rs b/src/source/synth.rs
similarity index 60%
rename from src/source/synth_waveforms.rs
rename to src/source/synth.rs
index ad910c03..1531b6d1 100644
--- a/src/source/synth_waveforms.rs
+++ b/src/source/synth.rs
@@ -2,17 +2,7 @@ use std::f32::consts::TAU;
 use std::time::Duration;
 
 use super::SeekError;
-use crate::{buffer::SamplesBuffer, source::Repeat, Source};
-
-
-/// Express a frequency as a rational number.
-///     .0 Cycles per time quanta
-///     .1 Time quanta per second
-///
-/// Examples:
-///     1000,1      1000 Hz
-///     12345,100   123.45 Hz
-pub struct RationalFrequency(u32, u32);
+use crate::Source;
 
 /// Syntheizer waveform functions. All of the synth waveforms are in the
 /// codomain [-1.0, 1.0].
@@ -27,77 +17,68 @@ pub enum SynthWaveformFunction {
 impl SynthWaveformFunction {
     /// Create a single sample for the given waveform
     #[inline]
-    pub fn render(&self, sample: u32, period: u32) -> f32 {
-        let i_div_p: f32 = sample as f32 / period as f32;
-            
+    pub fn render(&self, i: u64, period: f32) -> f32 {
+        let i_div_p: f32 = i as f32 / period;
+
         match self {
             Self::Sine => (TAU * i_div_p).sin(),
             Self::Triangle => 04.0f32 * (i_div_p - (i_div_p + 0.5f32).floor()).abs() - 1f32,
             Self::Square => {
-                    if i_div_p < 0.5f32 {
-                        1.0f32
-                    } else {
-                        -1.0f32
-                    }
-                },
+                if i_div_p % 1.0f32 < 0.5f32 {
+                    1.0f32
+                } else {
+                    -1.0f32
+                }
+            }
             Self::Sawtooth => 2.0f32 * (i_div_p - (i_div_p + 0.5f32).floor()),
         }
     }
-
-    /// Create a `SamplesBuffer` containing one period of `self` with the given
-    /// sample rate and frequency.
-    pub fn create_buffer(
-        &self,
-        sample_rate: cpal::SampleRate,
-        frequency: u32,
-    ) -> SamplesBuffer<f32> {
-        let period: usize = (sample_rate.0 / frequency) as usize;
-        let mut samples_vec = vec![0.0f32; period];
-
-        for i in 0..period {
-            samples_vec[i] = self.render(i as u32, period as u32);
-        }
-
-        SamplesBuffer::new(1, sample_rate.0, samples_vec)
-    }
 }
 
 /// An infinite source that produces one of a selection of synthesizer
-/// waveforms from a buffered source.
+/// waveforms.
 #[derive(Clone)]
-pub struct BufferedSynthWaveform {
-    input: Repeat<SamplesBuffer<f32>>,
+pub struct SynthWaveform {
+    sample_rate: cpal::SampleRate,
+    period: f32,
+    f: SynthWaveformFunction,
+    i: u64,
 }
 
-impl BufferedSynthWaveform {
+impl SynthWaveform {
     /// Create a new `SynthWaveform` object that generates an endless waveform
     /// `f`.
     #[inline]
     pub fn new(
         sample_rate: cpal::SampleRate,
-        frequency: u32,
+        frequency: f32,
         f: SynthWaveformFunction,
-    ) -> BufferedSynthWaveform {
-        let buffer = f.create_buffer(sample_rate, frequency);
-        BufferedSynthWaveform {
-            input: buffer.repeat_infinite(),
+    ) -> SynthWaveform {
+        let period = sample_rate.0 as f32 / frequency;
+        SynthWaveform {
+            sample_rate,
+            period,
+            f,
+            i: 0,
         }
     }
 }
 
-impl Iterator for BufferedSynthWaveform {
+impl Iterator for SynthWaveform {
     type Item = f32;
 
     #[inline]
     fn next(&mut self) -> Option<f32> {
-        self.input.next()
+        let this_i = self.i;
+        self.i += 1;
+        Some(self.f.render(this_i, self.period))
     }
 }
 
-impl Source for BufferedSynthWaveform {
+impl Source for SynthWaveform {
     #[inline]
     fn current_frame_len(&self) -> Option<usize> {
-        self.input.current_frame_len()
+        None
     }
 
     #[inline]
@@ -107,7 +88,7 @@ impl Source for BufferedSynthWaveform {
 
     #[inline]
     fn sample_rate(&self) -> u32 {
-        self.input.sample_rate()
+        self.sample_rate.0
     }
 
     #[inline]
@@ -117,18 +98,22 @@ impl Source for BufferedSynthWaveform {
 
     #[inline]
     fn try_seek(&mut self, duration: Duration) -> Result<(), SeekError> {
-        self.input.try_seek(duration)
+        self.i = (self.sample_rate.0 as f32 * duration.as_secs_f32()) as u64;
+        Ok(())
     }
 }
 
 #[cfg(test)]
 mod tests {
-    use crate::source::synth_waveforms::*;
+    use crate::source::synth::*;
 
     #[test]
     fn square() {
-        let mut wf =
-            BufferedSynthWaveform::new(cpal::SampleRate(1000), 250, SynthWaveformFunction::Square);
+        let mut wf = SynthWaveform::new(
+            cpal::SampleRate(2000),
+            500.0f32,
+            SynthWaveformFunction::Square,
+        );
         assert_eq!(wf.next(), Some(1.0f32));
         assert_eq!(wf.next(), Some(1.0f32));
         assert_eq!(wf.next(), Some(-1.0f32));
@@ -141,9 +126,9 @@ mod tests {
 
     #[test]
     fn triangle() {
-        let mut wf = BufferedSynthWaveform::new(
+        let mut wf = SynthWaveform::new(
             cpal::SampleRate(8000),
-            1000,
+            1000.0f32,
             SynthWaveformFunction::Triangle,
         );
         assert_eq!(wf.next(), Some(-1.0f32));
@@ -166,8 +151,11 @@ mod tests {
 
     #[test]
     fn saw() {
-        let mut wf =
-            BufferedSynthWaveform::new(cpal::SampleRate(200), 50, SynthWaveformFunction::Sawtooth);
+        let mut wf = SynthWaveform::new(
+            cpal::SampleRate(200),
+            50.0f32,
+            SynthWaveformFunction::Sawtooth,
+        );
         assert_eq!(wf.next(), Some(0.0f32));
         assert_eq!(wf.next(), Some(0.5f32));
         assert_eq!(wf.next(), Some(-1.0f32));
@@ -176,4 +164,11 @@ mod tests {
         assert_eq!(wf.next(), Some(0.5f32));
         assert_eq!(wf.next(), Some(-1.0f32));
     }
+
+    // #[test]
+    // fn sine() {
+    //     let mut wf =
+    //         SynthWaveform::new(cpal::SampleRate(1000), 100f32, SynthWaveformFunction::Sine);
+    //
+    // }
 }

From 107454efded065091990fe32ea921a155ce143bd Mon Sep 17 00:00:00 2001
From: Jamie Hardt <jamiehardt@me.com>
Date: Fri, 9 Aug 2024 12:54:41 -0700
Subject: [PATCH 04/31] Implementation of synth waveforms, tests

---
 src/source/synth.rs | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/src/source/synth.rs b/src/source/synth.rs
index 1531b6d1..499827c6 100644
--- a/src/source/synth.rs
+++ b/src/source/synth.rs
@@ -106,6 +106,7 @@ impl Source for SynthWaveform {
 #[cfg(test)]
 mod tests {
     use crate::source::synth::*;
+    use approx::assert_abs_diff_eq;
 
     #[test]
     fn square() {
@@ -165,10 +166,17 @@ mod tests {
         assert_eq!(wf.next(), Some(-1.0f32));
     }
 
-    // #[test]
-    // fn sine() {
-    //     let mut wf =
-    //         SynthWaveform::new(cpal::SampleRate(1000), 100f32, SynthWaveformFunction::Sine);
-    //
-    // }
+    #[test]
+    fn sine() {
+        let mut wf =
+            SynthWaveform::new(cpal::SampleRate(1000), 100f32, SynthWaveformFunction::Sine);
+
+        assert_abs_diff_eq!(wf.next().unwrap(), 0.0f32);
+        assert_abs_diff_eq!(wf.next().unwrap(), 0.58778525f32);
+        assert_abs_diff_eq!(wf.next().unwrap(), 0.95105652f32);
+        assert_abs_diff_eq!(wf.next().unwrap(), 0.95105652f32);
+        assert_abs_diff_eq!(wf.next().unwrap(), 0.58778525f32);
+        assert_abs_diff_eq!(wf.next().unwrap(), 0.0f32);
+        assert_abs_diff_eq!(wf.next().unwrap(), -0.58778554f32);
+    }
 }

From 7d4c9d78fa84ce4298e541fe18542c53caf9bae3 Mon Sep 17 00:00:00 2001
From: Jamie Hardt <jamiehardt@me.com>
Date: Fri, 9 Aug 2024 18:46:44 -0700
Subject: [PATCH 05/31] Implemented `sine` source as a Synth

---
 src/source/sine.rs  | 26 ++++++++++----------------
 src/source/synth.rs |  2 +-
 2 files changed, 11 insertions(+), 17 deletions(-)

diff --git a/src/source/sine.rs b/src/source/sine.rs
index 44aa48ee..f263dccd 100644
--- a/src/source/sine.rs
+++ b/src/source/sine.rs
@@ -1,26 +1,27 @@
-use std::f32::consts::PI;
 use std::time::Duration;
 
+use crate::source::{SynthWaveform, SynthWaveformFunction};
 use crate::Source;
 
 use super::SeekError;
 
+const SAMPLE_RATE: u32 = 46000;
+
 /// An infinite source that produces a sine.
 ///
 /// Always has a rate of 48kHz and one channel.
 #[derive(Clone, Debug)]
 pub struct SineWave {
-    freq: f32,
-    num_sample: usize,
+    synth: SynthWaveform,
 }
 
 impl SineWave {
     /// The frequency of the sine.
     #[inline]
     pub fn new(freq: f32) -> SineWave {
+        let sr = cpal::SampleRate(SAMPLE_RATE);
         SineWave {
-            freq,
-            num_sample: 0,
+            synth: SynthWaveform::new(sr, freq, SynthWaveformFunction::Sine),
         }
     }
 }
@@ -30,10 +31,7 @@ impl Iterator for SineWave {
 
     #[inline]
     fn next(&mut self) -> Option<f32> {
-        self.num_sample = self.num_sample.wrapping_add(1);
-
-        let value = 2.0 * PI * self.freq * self.num_sample as f32 / 48000.0;
-        Some(value.sin())
+        self.synth.next()
     }
 }
 
@@ -50,7 +48,7 @@ impl Source for SineWave {
 
     #[inline]
     fn sample_rate(&self) -> u32 {
-        48000
+        SAMPLE_RATE
     }
 
     #[inline]
@@ -59,11 +57,7 @@ impl Source for SineWave {
     }
 
     #[inline]
-    fn try_seek(&mut self, _: Duration) -> Result<(), SeekError> {
-        // This is a constant sound, normal seeking would not have any effect.
-        // While changing the phase of the sine wave could change how it sounds in
-        // combination with another sound (beating) such precision is not the intend
-        // of seeking
-        Ok(())
+    fn try_seek(&mut self, pos: Duration) -> Result<(), SeekError> {
+        self.synth.try_seek(pos)
     }
 }
diff --git a/src/source/synth.rs b/src/source/synth.rs
index 499827c6..e87dfe9e 100644
--- a/src/source/synth.rs
+++ b/src/source/synth.rs
@@ -37,7 +37,7 @@ impl SynthWaveformFunction {
 
 /// An infinite source that produces one of a selection of synthesizer
 /// waveforms.
-#[derive(Clone)]
+#[derive(Clone, Debug)]
 pub struct SynthWaveform {
     sample_rate: cpal::SampleRate,
     period: f32,

From 278390471538cdd26b3428bd303a77b17dcab68e Mon Sep 17 00:00:00 2001
From: Jamie Hardt <jamiehardt@me.com>
Date: Fri, 9 Aug 2024 20:17:42 -0700
Subject: [PATCH 06/31] Dumb typo on sine sample rate

---
 src/source/sine.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/source/sine.rs b/src/source/sine.rs
index f263dccd..6e78ec69 100644
--- a/src/source/sine.rs
+++ b/src/source/sine.rs
@@ -5,7 +5,7 @@ use crate::Source;
 
 use super::SeekError;
 
-const SAMPLE_RATE: u32 = 46000;
+const SAMPLE_RATE: u32 = 48000;
 
 /// An infinite source that produces a sine.
 ///

From b6c8a7ee48b5f87ae0653e217992599a5c68a416 Mon Sep 17 00:00:00 2001
From: Jamie Hardt <jamiehardt@me.com>
Date: Sun, 11 Aug 2024 14:13:42 -0700
Subject: [PATCH 07/31] Implemented White and Pink noise generators

Need to write an example app to test them.
---
 Cargo.toml          |   1 +
 src/source/mod.rs   |   1 +
 src/source/noise.rs | 106 ++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 108 insertions(+)
 create mode 100644 src/source/noise.rs

diff --git a/Cargo.toml b/Cargo.toml
index aa75167a..2c5ed858 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -18,6 +18,7 @@ minimp3_fixed = { version = "0.5.4", optional = true}
 symphonia = { version = "0.5.4", optional = true, default-features = false }
 crossbeam-channel = { version = "0.5.8", optional = true }
 thiserror = "1.0.49"
+rand = "0.8.5"
 
 [features]
 default = ["flac", "vorbis", "wav", "mp3"]
diff --git a/src/source/mod.rs b/src/source/mod.rs
index 84ce2f35..d86c8334 100644
--- a/src/source/mod.rs
+++ b/src/source/mod.rs
@@ -52,6 +52,7 @@ mod from_factory;
 mod from_iter;
 mod linear_ramp;
 mod mix;
+mod noise;
 mod pausable;
 mod periodic;
 mod position;
diff --git a/src/source/noise.rs b/src/source/noise.rs
new file mode 100644
index 00000000..cbbbbd12
--- /dev/null
+++ b/src/source/noise.rs
@@ -0,0 +1,106 @@
+use crate::Source;
+
+use rand::prelude::*;
+
+/// Generates an infinite stream of random samples in [=1.0, 1.0]
+#[derive(Clone, Debug)]
+pub struct WhiteNoise {
+    sample_rate: cpal::SampleRate,
+    rng: rand::rngs::ThreadRng,
+}
+
+impl WhiteNoise {
+    /// Create a new white noise generator.
+    pub fn new(sample_rate: cpal::SampleRate) -> Self {
+        Self {
+            sample_rate,
+            rng: rand::thread_rng(),
+        }
+    }
+}
+
+impl Iterator for WhiteNoise {
+    type Item = f32;
+
+    #[inline]
+    fn next(&mut self) -> Option<Self::Item> {
+        let ru32: i64 = self.rng.next_u32().into();
+        let scaled: i64 = 2 * ru32 - (u32::MAX / 2) as i64;
+        let sample: f32 = scaled as f32 / u32::MAX as f32;
+        Some(sample)
+    }
+}
+
+impl Source for WhiteNoise {
+    fn current_frame_len(&self) -> Option<usize> {
+        None
+    }
+
+    fn channels(&self) -> u16 {
+        1
+    }
+
+    fn sample_rate(&self) -> u32 {
+        self.sample_rate.0
+    }
+
+    fn total_duration(&self) -> Option<std::time::Duration> {
+        None
+    }
+}
+
+// https://www.musicdsp.org/en/latest/Filters/76-pink-noise-filter.html
+//
+/// Generate an infinite stream of pink noise samples in [-1.0, 1.0].
+struct PinkNoise {
+    noise: WhiteNoise,
+    b: [f32; 7],
+}
+
+impl PinkNoise {
+    pub fn new(sample_rate: cpal::SampleRate) -> Self {
+        Self {
+            noise: WhiteNoise::new(sample_rate),
+            b: [0.0f32, 0.0f32, 0.0f32, 0.0f32, 0.0f32, 0.0f32, 0.0f32],
+        }
+    }
+}
+
+impl Iterator for PinkNoise {
+    type Item = f32;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        let white = self.noise.next().unwrap();
+        self.b[0] = 0.99886 * self.b[0] + white * 0.0555179;
+        self.b[1] = 0.99332 * self.b[1] + white * 0.0750759;
+        self.b[2] = 0.96900 * self.b[2] + white * 0.1538520;
+        self.b[3] = 0.86650 * self.b[3] + white * 0.3104856;
+        self.b[4] = 0.55000 * self.b[4] + white * 0.5329522;
+        self.b[5] = -0.7616 * self.b[5] - white * 0.0168980;
+
+        let pink = self.b[0] + self.b[1] + self.b[2] + self.b[3] + self.b[4] + self.b[5] + 
+            self.b[6] + white * 0.5362;
+
+        self.b[6] = white * 0.115926;
+
+        Some(pink)
+    }
+}
+
+impl Source for PinkNoise {
+    fn current_frame_len(&self) -> Option<usize> {
+        None
+    }
+
+    fn channels(&self) -> u16 {
+        1
+    }
+
+    fn sample_rate(&self) -> u32 {
+        self.noise.sample_rate()
+    }
+
+    fn total_duration(&self) -> Option<std::time::Duration> {
+        None
+    }
+}

From 1eabb212ac21b7ac7d303eff09c3bb1463c9537f Mon Sep 17 00:00:00 2001
From: Jamie Hardt <jamiehardt@me.com>
Date: Sun, 11 Aug 2024 14:29:24 -0700
Subject: [PATCH 08/31] Some clippy and style changes

---
 src/source/mod.rs   |  1 +
 src/source/noise.rs | 38 ++++++++++++++++++++++++++++++--------
 2 files changed, 31 insertions(+), 8 deletions(-)

diff --git a/src/source/mod.rs b/src/source/mod.rs
index d86c8334..059c84ed 100644
--- a/src/source/mod.rs
+++ b/src/source/mod.rs
@@ -21,6 +21,7 @@ pub use self::from_factory::{from_factory, FromFactoryIter};
 pub use self::from_iter::{from_iter, FromIter};
 pub use self::linear_ramp::LinearGainRamp;
 pub use self::mix::Mix;
+pub use self::noise::{pink, white, PinkNoise, WhiteNoise};
 pub use self::pausable::Pausable;
 pub use self::periodic::PeriodicAccess;
 pub use self::position::TrackPosition;
diff --git a/src/source/noise.rs b/src/source/noise.rs
index cbbbbd12..f8b55aa9 100644
--- a/src/source/noise.rs
+++ b/src/source/noise.rs
@@ -2,6 +2,18 @@ use crate::Source;
 
 use rand::prelude::*;
 
+/// Create a new white noise source.
+#[inline]
+pub fn white(sample_rate: cpal::SampleRate) -> WhiteNoise {
+    WhiteNoise::new(sample_rate)
+}
+
+/// Create a new pink noise source.
+#[inline]
+pub fn pink(sample_rate: cpal::SampleRate) -> PinkNoise {
+    PinkNoise::new(sample_rate)
+}
+
 /// Generates an infinite stream of random samples in [=1.0, 1.0]
 #[derive(Clone, Debug)]
 pub struct WhiteNoise {
@@ -32,18 +44,22 @@ impl Iterator for WhiteNoise {
 }
 
 impl Source for WhiteNoise {
+    #[inline]
     fn current_frame_len(&self) -> Option<usize> {
         None
     }
 
+    #[inline]
     fn channels(&self) -> u16 {
         1
     }
 
+    #[inline]
     fn sample_rate(&self) -> u32 {
         self.sample_rate.0
     }
 
+    #[inline]
     fn total_duration(&self) -> Option<std::time::Duration> {
         None
     }
@@ -52,7 +68,7 @@ impl Source for WhiteNoise {
 // https://www.musicdsp.org/en/latest/Filters/76-pink-noise-filter.html
 //
 /// Generate an infinite stream of pink noise samples in [-1.0, 1.0].
-struct PinkNoise {
+pub struct PinkNoise {
     noise: WhiteNoise,
     b: [f32; 7],
 }
@@ -73,13 +89,19 @@ impl Iterator for PinkNoise {
         let white = self.noise.next().unwrap();
         self.b[0] = 0.99886 * self.b[0] + white * 0.0555179;
         self.b[1] = 0.99332 * self.b[1] + white * 0.0750759;
-        self.b[2] = 0.96900 * self.b[2] + white * 0.1538520;
-        self.b[3] = 0.86650 * self.b[3] + white * 0.3104856;
-        self.b[4] = 0.55000 * self.b[4] + white * 0.5329522;
-        self.b[5] = -0.7616 * self.b[5] - white * 0.0168980;
-
-        let pink = self.b[0] + self.b[1] + self.b[2] + self.b[3] + self.b[4] + self.b[5] + 
-            self.b[6] + white * 0.5362;
+        self.b[2] = 0.969 * self.b[2] + white * 0.153852;
+        self.b[3] = 0.8665 * self.b[3] + white * 0.3104856;
+        self.b[4] = 0.550 * self.b[4] + white * 0.5329522;
+        self.b[5] = -0.7616 * self.b[5] - white * 0.016898;
+
+        let pink = self.b[0]
+            + self.b[1]
+            + self.b[2]
+            + self.b[3]
+            + self.b[4]
+            + self.b[5]
+            + self.b[6]
+            + white * 0.5362;
 
         self.b[6] = white * 0.115926;
 

From 84a008dd2743531afc9c0ba1fbd255ff38ec0da1 Mon Sep 17 00:00:00 2001
From: Jamie Hardt <jamiehardt@me.com>
Date: Sun, 11 Aug 2024 15:28:15 -0700
Subject: [PATCH 09/31] Added noise_generator example

---
 examples/noise_generator.rs | 33 +++++++++++++++++++++++++++++++++
 src/source/noise.rs         | 27 +++++++++++++++++----------
 2 files changed, 50 insertions(+), 10 deletions(-)
 create mode 100644 examples/noise_generator.rs

diff --git a/examples/noise_generator.rs b/examples/noise_generator.rs
new file mode 100644
index 00000000..49f1f88e
--- /dev/null
+++ b/examples/noise_generator.rs
@@ -0,0 +1,33 @@
+use std::thread;
+use std::time::Duration;
+
+use rodio::source::{pink, white, Source};
+
+fn main() {
+    let (_stream, stream_handle) = rodio::OutputStream::try_default().unwrap();
+
+    let noise_duration = Duration::from_millis(1000);
+    let interval_duration = Duration::from_millis(1500);
+
+    stream_handle
+        .play_raw(
+            white(cpal::SampleRate(48000))
+                .amplify(0.1)
+                .take_duration(noise_duration),
+        )
+        .unwrap();
+    println!("Playing white noise");
+
+    thread::sleep(interval_duration);
+
+    stream_handle
+        .play_raw(
+            pink(cpal::SampleRate(48000))
+                .amplify(0.1)
+                .take_duration(noise_duration),
+        )
+        .unwrap();
+    println!("Playing pink noise");
+
+    thread::sleep(interval_duration);
+}
diff --git a/src/source/noise.rs b/src/source/noise.rs
index f8b55aa9..25f42266 100644
--- a/src/source/noise.rs
+++ b/src/source/noise.rs
@@ -1,6 +1,6 @@
 use crate::Source;
 
-use rand::prelude::*;
+use super::SeekError;
 
 /// Create a new white noise source.
 #[inline]
@@ -18,16 +18,12 @@ pub fn pink(sample_rate: cpal::SampleRate) -> PinkNoise {
 #[derive(Clone, Debug)]
 pub struct WhiteNoise {
     sample_rate: cpal::SampleRate,
-    rng: rand::rngs::ThreadRng,
 }
 
 impl WhiteNoise {
     /// Create a new white noise generator.
     pub fn new(sample_rate: cpal::SampleRate) -> Self {
-        Self {
-            sample_rate,
-            rng: rand::thread_rng(),
-        }
+        Self { sample_rate }
     }
 }
 
@@ -36,10 +32,9 @@ impl Iterator for WhiteNoise {
 
     #[inline]
     fn next(&mut self) -> Option<Self::Item> {
-        let ru32: i64 = self.rng.next_u32().into();
-        let scaled: i64 = 2 * ru32 - (u32::MAX / 2) as i64;
-        let sample: f32 = scaled as f32 / u32::MAX as f32;
-        Some(sample)
+        let randf = rand::random::<f32>();
+        let scaled = randf * 2.0 - 1.0;
+        Some(scaled)
     }
 }
 
@@ -63,6 +58,12 @@ impl Source for WhiteNoise {
     fn total_duration(&self) -> Option<std::time::Duration> {
         None
     }
+
+    #[inline]
+    fn try_seek(&mut self, _: std::time::Duration) -> Result<(), SeekError> {
+        // Does nothing, should do nothing
+        Ok(())
+    }
 }
 
 // https://www.musicdsp.org/en/latest/Filters/76-pink-noise-filter.html
@@ -125,4 +126,10 @@ impl Source for PinkNoise {
     fn total_duration(&self) -> Option<std::time::Duration> {
         None
     }
+
+    #[inline]
+    fn try_seek(&mut self, _: std::time::Duration) -> Result<(), SeekError> {
+        // Does nothing, should do nothing
+        Ok(())
+    }
 }

From a015eb49a20bf851fad0150f72709282ecd6933c Mon Sep 17 00:00:00 2001
From: Jamie Hardt <jamiehardt@me.com>
Date: Mon, 12 Aug 2024 20:28:25 -0700
Subject: [PATCH 10/31] Using SmallRng for white noise generation

This resolves a PR code review note and should make the source run
much faster.
---
 Cargo.toml          |  2 +-
 src/source/noise.rs | 11 +++++++++--
 2 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index 2c5ed858..a75b74c0 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -18,7 +18,7 @@ minimp3_fixed = { version = "0.5.4", optional = true}
 symphonia = { version = "0.5.4", optional = true, default-features = false }
 crossbeam-channel = { version = "0.5.8", optional = true }
 thiserror = "1.0.49"
-rand = "0.8.5"
+rand = {version = "0.8.5", features = ["small_rng"]}
 
 [features]
 default = ["flac", "vorbis", "wav", "mp3"]
diff --git a/src/source/noise.rs b/src/source/noise.rs
index 25f42266..dfee9172 100644
--- a/src/source/noise.rs
+++ b/src/source/noise.rs
@@ -2,6 +2,9 @@ use crate::Source;
 
 use super::SeekError;
 
+use rand::rngs::SmallRng;
+use rand::{RngCore, SeedableRng};
+
 /// Create a new white noise source.
 #[inline]
 pub fn white(sample_rate: cpal::SampleRate) -> WhiteNoise {
@@ -18,12 +21,16 @@ pub fn pink(sample_rate: cpal::SampleRate) -> PinkNoise {
 #[derive(Clone, Debug)]
 pub struct WhiteNoise {
     sample_rate: cpal::SampleRate,
+    rng: SmallRng,
 }
 
 impl WhiteNoise {
     /// Create a new white noise generator.
     pub fn new(sample_rate: cpal::SampleRate) -> Self {
-        Self { sample_rate }
+        Self {
+            sample_rate,
+            rng: SmallRng::from_entropy(),
+        }
     }
 }
 
@@ -32,7 +39,7 @@ impl Iterator for WhiteNoise {
 
     #[inline]
     fn next(&mut self) -> Option<Self::Item> {
-        let randf = rand::random::<f32>();
+        let randf = self.rng.next_u32() as f32 / u32::MAX as f32;
         let scaled = randf * 2.0 - 1.0;
         Some(scaled)
     }

From 56d087afbc8b1accdbf6a5090f88f81ad2d20f2b Mon Sep 17 00:00:00 2001
From: Jamie Hardt <jamiehardt@me.com>
Date: Thu, 15 Aug 2024 00:33:02 -0700
Subject: [PATCH 11/31] Renamed Synth to Test

Modules, files and types renamed
---
 src/source/mod.rs                         |  4 +--
 src/source/sine.rs                        |  6 ++--
 src/source/{synth.rs => test_waveform.rs} | 36 +++++++++++------------
 3 files changed, 23 insertions(+), 23 deletions(-)
 rename src/source/{synth.rs => test_waveform.rs} (86%)

diff --git a/src/source/mod.rs b/src/source/mod.rs
index 059c84ed..6043318c 100644
--- a/src/source/mod.rs
+++ b/src/source/mod.rs
@@ -33,7 +33,7 @@ pub use self::skippable::Skippable;
 pub use self::spatial::Spatial;
 pub use self::speed::Speed;
 pub use self::stoppable::Stoppable;
-pub use self::synth::{SynthWaveform, SynthWaveformFunction};
+pub use self::test_waveform::{TestWaveform, TestWaveformFunction};
 pub use self::take::TakeDuration;
 pub use self::uniform::UniformSourceIterator;
 pub use self::zero::Zero;
@@ -65,8 +65,8 @@ mod skippable;
 mod spatial;
 mod speed;
 mod stoppable;
-mod synth;
 mod take;
+mod test_waveform;
 mod uniform;
 mod zero;
 
diff --git a/src/source/sine.rs b/src/source/sine.rs
index 6e78ec69..b9c11a05 100644
--- a/src/source/sine.rs
+++ b/src/source/sine.rs
@@ -1,6 +1,6 @@
 use std::time::Duration;
 
-use crate::source::{SynthWaveform, SynthWaveformFunction};
+use crate::source::{TestWaveform, TestWaveformFunction};
 use crate::Source;
 
 use super::SeekError;
@@ -12,7 +12,7 @@ const SAMPLE_RATE: u32 = 48000;
 /// Always has a rate of 48kHz and one channel.
 #[derive(Clone, Debug)]
 pub struct SineWave {
-    synth: SynthWaveform,
+    synth: TestWaveform,
 }
 
 impl SineWave {
@@ -21,7 +21,7 @@ impl SineWave {
     pub fn new(freq: f32) -> SineWave {
         let sr = cpal::SampleRate(SAMPLE_RATE);
         SineWave {
-            synth: SynthWaveform::new(sr, freq, SynthWaveformFunction::Sine),
+            synth: TestWaveform::new(sr, freq, TestWaveformFunction::Sine),
         }
     }
 }
diff --git a/src/source/synth.rs b/src/source/test_waveform.rs
similarity index 86%
rename from src/source/synth.rs
rename to src/source/test_waveform.rs
index e87dfe9e..6919bead 100644
--- a/src/source/synth.rs
+++ b/src/source/test_waveform.rs
@@ -7,14 +7,14 @@ use crate::Source;
 /// Syntheizer waveform functions. All of the synth waveforms are in the
 /// codomain [-1.0, 1.0].
 #[derive(Clone, Debug)]
-pub enum SynthWaveformFunction {
+pub enum TestWaveformFunction {
     Sine,
     Triangle,
     Square,
     Sawtooth,
 }
 
-impl SynthWaveformFunction {
+impl TestWaveformFunction {
     /// Create a single sample for the given waveform
     #[inline]
     pub fn render(&self, i: u64, period: f32) -> f32 {
@@ -38,24 +38,24 @@ impl SynthWaveformFunction {
 /// An infinite source that produces one of a selection of synthesizer
 /// waveforms.
 #[derive(Clone, Debug)]
-pub struct SynthWaveform {
+pub struct TestWaveform {
     sample_rate: cpal::SampleRate,
     period: f32,
-    f: SynthWaveformFunction,
+    f: TestWaveformFunction,
     i: u64,
 }
 
-impl SynthWaveform {
+impl TestWaveform {
     /// Create a new `SynthWaveform` object that generates an endless waveform
     /// `f`.
     #[inline]
     pub fn new(
         sample_rate: cpal::SampleRate,
         frequency: f32,
-        f: SynthWaveformFunction,
-    ) -> SynthWaveform {
+        f: TestWaveformFunction,
+    ) -> TestWaveform {
         let period = sample_rate.0 as f32 / frequency;
-        SynthWaveform {
+        TestWaveform {
             sample_rate,
             period,
             f,
@@ -64,7 +64,7 @@ impl SynthWaveform {
     }
 }
 
-impl Iterator for SynthWaveform {
+impl Iterator for TestWaveform {
     type Item = f32;
 
     #[inline]
@@ -75,7 +75,7 @@ impl Iterator for SynthWaveform {
     }
 }
 
-impl Source for SynthWaveform {
+impl Source for TestWaveform {
     #[inline]
     fn current_frame_len(&self) -> Option<usize> {
         None
@@ -105,15 +105,15 @@ impl Source for SynthWaveform {
 
 #[cfg(test)]
 mod tests {
-    use crate::source::synth::*;
+    use crate::source::{TestWaveform, TestWaveformFunction};
     use approx::assert_abs_diff_eq;
 
     #[test]
     fn square() {
-        let mut wf = SynthWaveform::new(
+        let mut wf = TestWaveform::new(
             cpal::SampleRate(2000),
             500.0f32,
-            SynthWaveformFunction::Square,
+            TestWaveformFunction::Square,
         );
         assert_eq!(wf.next(), Some(1.0f32));
         assert_eq!(wf.next(), Some(1.0f32));
@@ -127,10 +127,10 @@ mod tests {
 
     #[test]
     fn triangle() {
-        let mut wf = SynthWaveform::new(
+        let mut wf = TestWaveform::new(
             cpal::SampleRate(8000),
             1000.0f32,
-            SynthWaveformFunction::Triangle,
+            TestWaveformFunction::Triangle,
         );
         assert_eq!(wf.next(), Some(-1.0f32));
         assert_eq!(wf.next(), Some(-0.5f32));
@@ -152,10 +152,10 @@ mod tests {
 
     #[test]
     fn saw() {
-        let mut wf = SynthWaveform::new(
+        let mut wf = TestWaveform::new(
             cpal::SampleRate(200),
             50.0f32,
-            SynthWaveformFunction::Sawtooth,
+            TestWaveformFunction::Sawtooth,
         );
         assert_eq!(wf.next(), Some(0.0f32));
         assert_eq!(wf.next(), Some(0.5f32));
@@ -169,7 +169,7 @@ mod tests {
     #[test]
     fn sine() {
         let mut wf =
-            SynthWaveform::new(cpal::SampleRate(1000), 100f32, SynthWaveformFunction::Sine);
+            TestWaveform::new(cpal::SampleRate(1000), 100f32, TestWaveformFunction::Sine);
 
         assert_abs_diff_eq!(wf.next().unwrap(), 0.0f32);
         assert_abs_diff_eq!(wf.next().unwrap(), 0.58778525f32);

From 0907857501f68aa0e9b020e13232a35fd6c6ba62 Mon Sep 17 00:00:00 2001
From: Jamie Hardt <jamiehardt@me.com>
Date: Thu, 15 Aug 2024 01:01:53 -0700
Subject: [PATCH 12/31] Documentation updates

---
 src/source/mod.rs           |  2 +-
 src/source/test_waveform.rs | 29 +++++++++++++++++++++--------
 2 files changed, 22 insertions(+), 9 deletions(-)

diff --git a/src/source/mod.rs b/src/source/mod.rs
index 6043318c..3448529e 100644
--- a/src/source/mod.rs
+++ b/src/source/mod.rs
@@ -33,8 +33,8 @@ pub use self::skippable::Skippable;
 pub use self::spatial::Spatial;
 pub use self::speed::Speed;
 pub use self::stoppable::Stoppable;
-pub use self::test_waveform::{TestWaveform, TestWaveformFunction};
 pub use self::take::TakeDuration;
+pub use self::test_waveform::{TestWaveform, TestWaveformFunction};
 pub use self::uniform::UniformSourceIterator;
 pub use self::zero::Zero;
 
diff --git a/src/source/test_waveform.rs b/src/source/test_waveform.rs
index 6919bead..1b2214bd 100644
--- a/src/source/test_waveform.rs
+++ b/src/source/test_waveform.rs
@@ -1,23 +1,38 @@
+//! Generator sources for various periodic test waveforms.
+//!
+//! This module provides several periodic, deterministic waveforms for testing other sources. Every
+//! source oscillates in the codomain `[-1.0f32, 1.0f32]`.
+//!
+//! # Example
+//!
+//! ```
+//! use rodio::source::{TestWaveform,TestWaveformFunction};
+//!
+//! let tone = TestWaveform::new(cpal::SampleRate(48000), 440.0, TestWaveformFunction::Sine);
+//! ```
 use std::f32::consts::TAU;
 use std::time::Duration;
 
 use super::SeekError;
 use crate::Source;
 
-/// Syntheizer waveform functions. All of the synth waveforms are in the
-/// codomain [-1.0, 1.0].
+/// Test waveform functions.
 #[derive(Clone, Debug)]
 pub enum TestWaveformFunction {
+    /// A sinusoidal waveform.
     Sine,
+    /// A triangle wave.
     Triangle,
+    /// A square wave, rising edge at t=0.
     Square,
+    /// A rising swatooth wave.
     Sawtooth,
 }
 
 impl TestWaveformFunction {
     /// Create a single sample for the given waveform
     #[inline]
-    pub fn render(&self, i: u64, period: f32) -> f32 {
+    fn render(&self, i: u64, period: f32) -> f32 {
         let i_div_p: f32 = i as f32 / period;
 
         match self {
@@ -35,8 +50,7 @@ impl TestWaveformFunction {
     }
 }
 
-/// An infinite source that produces one of a selection of synthesizer
-/// waveforms.
+/// An infinite source that produces one of a selection of test waveforms.
 #[derive(Clone, Debug)]
 pub struct TestWaveform {
     sample_rate: cpal::SampleRate,
@@ -46,7 +60,7 @@ pub struct TestWaveform {
 }
 
 impl TestWaveform {
-    /// Create a new `SynthWaveform` object that generates an endless waveform
+    /// Create a new `TestWaveform` object that generates an endless waveform
     /// `f`.
     #[inline]
     pub fn new(
@@ -168,8 +182,7 @@ mod tests {
 
     #[test]
     fn sine() {
-        let mut wf =
-            TestWaveform::new(cpal::SampleRate(1000), 100f32, TestWaveformFunction::Sine);
+        let mut wf = TestWaveform::new(cpal::SampleRate(1000), 100f32, TestWaveformFunction::Sine);
 
         assert_abs_diff_eq!(wf.next().unwrap(), 0.0f32);
         assert_abs_diff_eq!(wf.next().unwrap(), 0.58778525f32);

From 87cd605d73060181eb5a8b3129028b5d3ef6f114 Mon Sep 17 00:00:00 2001
From: Jamie Hardt <jamiehardt@me.com>
Date: Thu, 15 Aug 2024 01:32:46 -0700
Subject: [PATCH 13/31] More documentation, WhiteNoise creation option.

---
 src/source/noise.rs         | 25 +++++++++++++++++++------
 src/source/test_waveform.rs |  5 +++--
 2 files changed, 22 insertions(+), 8 deletions(-)

diff --git a/src/source/noise.rs b/src/source/noise.rs
index dfee9172..04b450ed 100644
--- a/src/source/noise.rs
+++ b/src/source/noise.rs
@@ -1,3 +1,6 @@
+//! Noise sources.
+//!
+//!
 use crate::Source;
 
 use super::SeekError;
@@ -5,19 +8,20 @@ use super::SeekError;
 use rand::rngs::SmallRng;
 use rand::{RngCore, SeedableRng};
 
-/// Create a new white noise source.
+/// Create a new `WhiteNoise` noise source.
 #[inline]
 pub fn white(sample_rate: cpal::SampleRate) -> WhiteNoise {
     WhiteNoise::new(sample_rate)
 }
 
-/// Create a new pink noise source.
+/// Create a new `PinkNoise` noise source.
 #[inline]
 pub fn pink(sample_rate: cpal::SampleRate) -> PinkNoise {
     PinkNoise::new(sample_rate)
 }
 
-/// Generates an infinite stream of random samples in [=1.0, 1.0]
+/// Generates an infinite stream of random samples in [-1.0, 1.0]. This source generates random
+/// samples as provided by the `rand::rngs::SmallRng` randomness source.
 #[derive(Clone, Debug)]
 pub struct WhiteNoise {
     sample_rate: cpal::SampleRate,
@@ -25,7 +29,15 @@ pub struct WhiteNoise {
 }
 
 impl WhiteNoise {
-    /// Create a new white noise generator.
+    /// Create a new white noise generator, seeding the RNG with `seed`.
+    pub fn new_with_seed(sample_rate: cpal::SampleRate, seed: u64) -> Self {
+        Self {
+            sample_rate,
+            rng: SmallRng::seed_from_u64(seed),
+        }
+    }
+
+    /// Create a new white noise generator, seeding the RNG with system entropy.
     pub fn new(sample_rate: cpal::SampleRate) -> Self {
         Self {
             sample_rate,
@@ -73,9 +85,10 @@ impl Source for WhiteNoise {
     }
 }
 
-// https://www.musicdsp.org/en/latest/Filters/76-pink-noise-filter.html
-//
 /// Generate an infinite stream of pink noise samples in [-1.0, 1.0].
+///
+/// The output of this source is the result of taking the output of the `WhiteNoise` source and
+/// filtering it according to a weighted-sum of seven FIR filters after [Paul Kellett](https://www.musicdsp.org/en/latest/Filters/76-pink-noise-filter.html).
 pub struct PinkNoise {
     noise: WhiteNoise,
     b: [f32; 7],
diff --git a/src/source/test_waveform.rs b/src/source/test_waveform.rs
index 1b2214bd..b9615aea 100644
--- a/src/source/test_waveform.rs
+++ b/src/source/test_waveform.rs
@@ -1,7 +1,8 @@
 //! Generator sources for various periodic test waveforms.
 //!
-//! This module provides several periodic, deterministic waveforms for testing other sources. Every
-//! source oscillates in the codomain `[-1.0f32, 1.0f32]`.
+//! This module provides several periodic, deterministic waveforms for testing other sources and
+//! for simple additive sound synthesis. Every source is monoaural and in the codomain `[-1.0f32,
+//! 1.0f32]` 
 //!
 //! # Example
 //!

From 59a5b1236738888699b32b161a894479b50741ca Mon Sep 17 00:00:00 2001
From: Jamie Hardt <jamiehardt@me.com>
Date: Mon, 19 Aug 2024 17:14:06 -0500
Subject: [PATCH 14/31] Several code review fixes

---
 src/source/chirp.rs         | 79 +++++++++++++++++++++++++++++++++++++
 src/source/mod.rs           |  2 +
 src/source/noise.rs         | 25 ++++++------
 src/source/sine.rs          |  8 ++--
 src/source/test_waveform.rs | 37 +++++++++--------
 5 files changed, 120 insertions(+), 31 deletions(-)
 create mode 100644 src/source/chirp.rs

diff --git a/src/source/chirp.rs b/src/source/chirp.rs
new file mode 100644
index 00000000..43d2b30d
--- /dev/null
+++ b/src/source/chirp.rs
@@ -0,0 +1,79 @@
+//! Chirp/sweep source.
+
+use std::time::Duration;
+
+use crate::Source;
+
+/// Convenience function to create a new `Chirp` source.
+#[inline]
+pub fn chirp(
+    sample_rate: cpal::SampleRate,
+    start_frequency: f32,
+    end_frequency: f32,
+    duration: Duration,
+) -> Chirp {
+    Chirp::new(sample_rate, start_frequency, end_frequency, duration)
+}
+
+/// Generate a sine wave with an instantaneous frequency that changes/sweeps linearly over time.
+/// At the end of the chirp, once the `end_frequency` is reached, the source is exhausted.
+#[derive(Clone, Debug)]
+pub struct Chirp {
+    start_frequency: f32,
+    end_frequency: f32,
+    sample_rate: cpal::SampleRate,
+    total_samples: u64,
+    elapsed_samples: u64,
+}
+
+impl Chirp {
+    fn new(
+        sample_rate: cpal::SampleRate,
+        start_frequency: f32,
+        end_frequency: f32,
+        duration: Duration,
+    ) -> Self {
+        Self {
+            sample_rate,
+            start_frequency,
+            end_frequency,
+            total_samples: (duration.as_secs_f64() * (sample_rate.0 as f64)) as u64,
+            elapsed_samples: 0,
+        }
+    }
+}
+
+impl Iterator for Chirp {
+    type Item = f32;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        let i = self.elapsed_samples;
+        self.elapsed_samples += 1;
+
+
+        todo!()
+    }
+}
+
+impl Source for Chirp {
+    fn current_frame_len(&self) -> Option<usize> {
+        None
+    }
+
+    fn channels(&self) -> u16 {
+        1
+    }
+
+    fn sample_rate(&self) -> u32 {
+        self.sample_rate.0
+    }
+
+    fn total_duration(&self) -> Option<Duration> {
+        let secs: f64 = self.total_samples as f64 / self.sample_rate.0 as f64;
+        Some(Duration::new(1,0).mul_f64(secs))
+    }
+
+    fn try_seek(&mut self, pos: Duration) -> Result<(), super::SeekError> {
+        todo!()
+    }
+}
diff --git a/src/source/mod.rs b/src/source/mod.rs
index 3448529e..23f058de 100644
--- a/src/source/mod.rs
+++ b/src/source/mod.rs
@@ -10,6 +10,7 @@ pub use self::amplify::Amplify;
 pub use self::blt::BltFilter;
 pub use self::buffered::Buffered;
 pub use self::channel_volume::ChannelVolume;
+pub use self::chirp::{chirp, Chirp};
 pub use self::crossfade::Crossfade;
 pub use self::delay::Delay;
 pub use self::done::Done;
@@ -41,6 +42,7 @@ pub use self::zero::Zero;
 mod amplify;
 mod blt;
 mod buffered;
+mod chirp;
 mod channel_volume;
 mod crossfade;
 mod delay;
diff --git a/src/source/noise.rs b/src/source/noise.rs
index 04b450ed..434cc998 100644
--- a/src/source/noise.rs
+++ b/src/source/noise.rs
@@ -8,13 +8,13 @@ use super::SeekError;
 use rand::rngs::SmallRng;
 use rand::{RngCore, SeedableRng};
 
-/// Create a new `WhiteNoise` noise source.
+/// Convenience function to create a new `WhiteNoise` noise source.
 #[inline]
 pub fn white(sample_rate: cpal::SampleRate) -> WhiteNoise {
     WhiteNoise::new(sample_rate)
 }
 
-/// Create a new `PinkNoise` noise source.
+/// Convenience function to create a new `PinkNoise` noise source.
 #[inline]
 pub fn pink(sample_rate: cpal::SampleRate) -> PinkNoise {
     PinkNoise::new(sample_rate)
@@ -51,8 +51,8 @@ impl Iterator for WhiteNoise {
 
     #[inline]
     fn next(&mut self) -> Option<Self::Item> {
-        let randf = self.rng.next_u32() as f32 / u32::MAX as f32;
-        let scaled = randf * 2.0 - 1.0;
+        let rand = self.rng.next_u32() as f32 / u32::MAX as f32;
+        let scaled = rand * 2.0 - 1.0;
         Some(scaled)
     }
 }
@@ -85,19 +85,22 @@ impl Source for WhiteNoise {
     }
 }
 
-/// Generate an infinite stream of pink noise samples in [-1.0, 1.0].
+/// Generates an infinite stream of pink noise samples in [-1.0, 1.0].
 ///
-/// The output of this source is the result of taking the output of the `WhiteNoise` source and
-/// filtering it according to a weighted-sum of seven FIR filters after [Paul Kellett](https://www.musicdsp.org/en/latest/Filters/76-pink-noise-filter.html).
+/// The output of the source is the result of taking the output of the `WhiteNoise` source and
+/// filtering it according to a weighted-sum of seven FIR filters after [Paul Kellett's
+/// method][pk_method] from *musicdsp.org*.
+///
+/// [pk_method]: https://www.musicdsp.org/en/latest/Filters/76-pink-noise-filter.html
 pub struct PinkNoise {
-    noise: WhiteNoise,
+    white_noise: WhiteNoise,
     b: [f32; 7],
 }
 
 impl PinkNoise {
     pub fn new(sample_rate: cpal::SampleRate) -> Self {
         Self {
-            noise: WhiteNoise::new(sample_rate),
+            white_noise: WhiteNoise::new(sample_rate),
             b: [0.0f32, 0.0f32, 0.0f32, 0.0f32, 0.0f32, 0.0f32, 0.0f32],
         }
     }
@@ -107,7 +110,7 @@ impl Iterator for PinkNoise {
     type Item = f32;
 
     fn next(&mut self) -> Option<Self::Item> {
-        let white = self.noise.next().unwrap();
+        let white = self.white_noise.next().unwrap();
         self.b[0] = 0.99886 * self.b[0] + white * 0.0555179;
         self.b[1] = 0.99332 * self.b[1] + white * 0.0750759;
         self.b[2] = 0.969 * self.b[2] + white * 0.153852;
@@ -140,7 +143,7 @@ impl Source for PinkNoise {
     }
 
     fn sample_rate(&self) -> u32 {
-        self.noise.sample_rate()
+        self.white_noise.sample_rate()
     }
 
     fn total_duration(&self) -> Option<std::time::Duration> {
diff --git a/src/source/sine.rs b/src/source/sine.rs
index b9c11a05..0fafcf00 100644
--- a/src/source/sine.rs
+++ b/src/source/sine.rs
@@ -12,7 +12,7 @@ const SAMPLE_RATE: u32 = 48000;
 /// Always has a rate of 48kHz and one channel.
 #[derive(Clone, Debug)]
 pub struct SineWave {
-    synth: TestWaveform,
+    test_sine: TestWaveform,
 }
 
 impl SineWave {
@@ -21,7 +21,7 @@ impl SineWave {
     pub fn new(freq: f32) -> SineWave {
         let sr = cpal::SampleRate(SAMPLE_RATE);
         SineWave {
-            synth: TestWaveform::new(sr, freq, TestWaveformFunction::Sine),
+            test_sine: TestWaveform::new(sr, freq, TestWaveformFunction::Sine),
         }
     }
 }
@@ -31,7 +31,7 @@ impl Iterator for SineWave {
 
     #[inline]
     fn next(&mut self) -> Option<f32> {
-        self.synth.next()
+        self.test_sine.next()
     }
 }
 
@@ -58,6 +58,6 @@ impl Source for SineWave {
 
     #[inline]
     fn try_seek(&mut self, pos: Duration) -> Result<(), SeekError> {
-        self.synth.try_seek(pos)
+        self.test_sine.try_seek(pos)
     }
 }
diff --git a/src/source/test_waveform.rs b/src/source/test_waveform.rs
index b9615aea..420eac58 100644
--- a/src/source/test_waveform.rs
+++ b/src/source/test_waveform.rs
@@ -1,8 +1,8 @@
 //! Generator sources for various periodic test waveforms.
 //!
 //! This module provides several periodic, deterministic waveforms for testing other sources and
-//! for simple additive sound synthesis. Every source is monoaural and in the codomain `[-1.0f32,
-//! 1.0f32]` 
+//! for simple additive sound synthesis. Every source is monoaural and in the codomain [-1.0f32,
+//! 1.0f32].
 //!
 //! # Example
 //!
@@ -17,12 +17,12 @@ use std::time::Duration;
 use super::SeekError;
 use crate::Source;
 
-/// Test waveform functions.
+/// Waveform functions.
 #[derive(Clone, Debug)]
-pub enum TestWaveformFunction {
+pub enum Function {
     /// A sinusoidal waveform.
     Sine,
-    /// A triangle wave.
+    /// A triangle waveform.
     Triangle,
     /// A square wave, rising edge at t=0.
     Square,
@@ -30,7 +30,7 @@ pub enum TestWaveformFunction {
     Sawtooth,
 }
 
-impl TestWaveformFunction {
+impl Function {
     /// Create a single sample for the given waveform
     #[inline]
     fn render(&self, i: u64, period: f32) -> f32 {
@@ -38,7 +38,7 @@ impl TestWaveformFunction {
 
         match self {
             Self::Sine => (TAU * i_div_p).sin(),
-            Self::Triangle => 04.0f32 * (i_div_p - (i_div_p + 0.5f32).floor()).abs() - 1f32,
+            Self::Triangle => 4.0f32 * (i_div_p - (i_div_p + 0.5f32).floor()).abs() - 1f32,
             Self::Square => {
                 if i_div_p % 1.0f32 < 0.5f32 {
                     1.0f32
@@ -56,24 +56,29 @@ impl TestWaveformFunction {
 pub struct TestWaveform {
     sample_rate: cpal::SampleRate,
     period: f32,
-    f: TestWaveformFunction,
+    function: Function,
     i: u64,
 }
 
 impl TestWaveform {
     /// Create a new `TestWaveform` object that generates an endless waveform
     /// `f`.
+    ///
+    /// # Panics
+    ///
+    /// Will panic if `frequency` is equal to zero.
     #[inline]
     pub fn new(
         sample_rate: cpal::SampleRate,
         frequency: f32,
-        f: TestWaveformFunction,
+        f: Function,
     ) -> TestWaveform {
+        assert!(frequency != 0.0, "frequency must be greater than zero");
         let period = sample_rate.0 as f32 / frequency;
         TestWaveform {
             sample_rate,
             period,
-            f,
+            function: f,
             i: 0,
         }
     }
@@ -86,7 +91,7 @@ impl Iterator for TestWaveform {
     fn next(&mut self) -> Option<f32> {
         let this_i = self.i;
         self.i += 1;
-        Some(self.f.render(this_i, self.period))
+        Some(self.function.render(this_i, self.period))
     }
 }
 
@@ -120,7 +125,7 @@ impl Source for TestWaveform {
 
 #[cfg(test)]
 mod tests {
-    use crate::source::{TestWaveform, TestWaveformFunction};
+    use crate::source::{TestWaveform, Function};
     use approx::assert_abs_diff_eq;
 
     #[test]
@@ -128,7 +133,7 @@ mod tests {
         let mut wf = TestWaveform::new(
             cpal::SampleRate(2000),
             500.0f32,
-            TestWaveformFunction::Square,
+            Function::Square,
         );
         assert_eq!(wf.next(), Some(1.0f32));
         assert_eq!(wf.next(), Some(1.0f32));
@@ -145,7 +150,7 @@ mod tests {
         let mut wf = TestWaveform::new(
             cpal::SampleRate(8000),
             1000.0f32,
-            TestWaveformFunction::Triangle,
+            Function::Triangle,
         );
         assert_eq!(wf.next(), Some(-1.0f32));
         assert_eq!(wf.next(), Some(-0.5f32));
@@ -170,7 +175,7 @@ mod tests {
         let mut wf = TestWaveform::new(
             cpal::SampleRate(200),
             50.0f32,
-            TestWaveformFunction::Sawtooth,
+            Function::Sawtooth,
         );
         assert_eq!(wf.next(), Some(0.0f32));
         assert_eq!(wf.next(), Some(0.5f32));
@@ -183,7 +188,7 @@ mod tests {
 
     #[test]
     fn sine() {
-        let mut wf = TestWaveform::new(cpal::SampleRate(1000), 100f32, TestWaveformFunction::Sine);
+        let mut wf = TestWaveform::new(cpal::SampleRate(1000), 100f32, Function::Sine);
 
         assert_abs_diff_eq!(wf.next().unwrap(), 0.0f32);
         assert_abs_diff_eq!(wf.next().unwrap(), 0.58778525f32);

From a012ac1a48ae5e96b118384d8f820b15037e30ab Mon Sep 17 00:00:00 2001
From: Jamie Hardt <jamiehardt@me.com>
Date: Mon, 19 Aug 2024 17:15:27 -0500
Subject: [PATCH 15/31] Changes for code reviews

---
 Cargo.toml         | 3 ++-
 src/source/mod.rs  | 2 +-
 src/source/sine.rs | 4 ++--
 3 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index a75b74c0..b93973d1 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -18,7 +18,7 @@ minimp3_fixed = { version = "0.5.4", optional = true}
 symphonia = { version = "0.5.4", optional = true, default-features = false }
 crossbeam-channel = { version = "0.5.8", optional = true }
 thiserror = "1.0.49"
-rand = {version = "0.8.5", features = ["small_rng"]}
+rand = { version = "0.8.5", features = ["small_rng"], optional = true }
 
 [features]
 default = ["flac", "vorbis", "wav", "mp3"]
@@ -28,6 +28,7 @@ vorbis = ["lewton"]
 wav = ["hound"]
 mp3 = ["symphonia-mp3"]
 minimp3 = ["dep:minimp3_fixed"]
+noise = ["rand"]
 wasm-bindgen = ["cpal/wasm-bindgen"]
 cpal-shared-stdcxx = ["cpal/oboe-shared-stdcxx"]
 symphonia-aac = ["symphonia/aac"]
diff --git a/src/source/mod.rs b/src/source/mod.rs
index 23f058de..14e252e7 100644
--- a/src/source/mod.rs
+++ b/src/source/mod.rs
@@ -35,7 +35,7 @@ pub use self::spatial::Spatial;
 pub use self::speed::Speed;
 pub use self::stoppable::Stoppable;
 pub use self::take::TakeDuration;
-pub use self::test_waveform::{TestWaveform, TestWaveformFunction};
+pub use self::test_waveform::{TestWaveform, Function};
 pub use self::uniform::UniformSourceIterator;
 pub use self::zero::Zero;
 
diff --git a/src/source/sine.rs b/src/source/sine.rs
index 0fafcf00..9a92b20b 100644
--- a/src/source/sine.rs
+++ b/src/source/sine.rs
@@ -1,6 +1,6 @@
 use std::time::Duration;
 
-use crate::source::{TestWaveform, TestWaveformFunction};
+use crate::source::{TestWaveform, Function};
 use crate::Source;
 
 use super::SeekError;
@@ -21,7 +21,7 @@ impl SineWave {
     pub fn new(freq: f32) -> SineWave {
         let sr = cpal::SampleRate(SAMPLE_RATE);
         SineWave {
-            test_sine: TestWaveform::new(sr, freq, TestWaveformFunction::Sine),
+            test_sine: TestWaveform::new(sr, freq, Function::Sine),
         }
     }
 }

From 0c2c1941d6edec698e6b7baeb59275081a9f8051 Mon Sep 17 00:00:00 2001
From: Jamie Hardt <jamiehardt@me.com>
Date: Mon, 19 Aug 2024 17:39:25 -0500
Subject: [PATCH 16/31] Made noise feature

Noise source and example guarded by it.
---
 Cargo.toml                  |  4 ++++
 examples/noise_generator.rs | 16 ++++++++++++----
 src/source/chirp.rs         |  3 +--
 src/source/mod.rs           | 11 +++++++----
 src/source/noise.rs         |  4 ++--
 src/source/sine.rs          |  2 +-
 src/source/test_waveform.rs | 34 +++++++++-------------------------
 7 files changed, 36 insertions(+), 38 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index b93973d1..fc29e7fd 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -50,3 +50,7 @@ approx = "0.5.1"
 [[example]]
 name = "music_m4a"
 required-features = ["symphonia-isomp4", "symphonia-aac"]
+
+[[example]]
+name = "noise_generator"
+required-features = ["noise"]
diff --git a/examples/noise_generator.rs b/examples/noise_generator.rs
index 49f1f88e..a72bcb7c 100644
--- a/examples/noise_generator.rs
+++ b/examples/noise_generator.rs
@@ -1,9 +1,11 @@
-use std::thread;
-use std::time::Duration;
-
-use rodio::source::{pink, white, Source};
+//! Noise generator example. Use the "noise" feature to enable the noise generator sources.
 
+#[cfg(feature = "noise")]
 fn main() {
+    use rodio::source::{pink, white, Source};
+    use std::thread;
+    use std::time::Duration;
+
     let (_stream, stream_handle) = rodio::OutputStream::try_default().unwrap();
 
     let noise_duration = Duration::from_millis(1000);
@@ -31,3 +33,9 @@ fn main() {
 
     thread::sleep(interval_duration);
 }
+
+#[cfg(not(feature = "noise"))]
+fn main() {
+    println!("rodio has not been compiled with noise sources, use `--features noise` to enable this feature.");
+    println!("Exiting...");
+}
diff --git a/src/source/chirp.rs b/src/source/chirp.rs
index 43d2b30d..8fabc292 100644
--- a/src/source/chirp.rs
+++ b/src/source/chirp.rs
@@ -50,7 +50,6 @@ impl Iterator for Chirp {
         let i = self.elapsed_samples;
         self.elapsed_samples += 1;
 
-
         todo!()
     }
 }
@@ -70,7 +69,7 @@ impl Source for Chirp {
 
     fn total_duration(&self) -> Option<Duration> {
         let secs: f64 = self.total_samples as f64 / self.sample_rate.0 as f64;
-        Some(Duration::new(1,0).mul_f64(secs))
+        Some(Duration::new(1, 0).mul_f64(secs))
     }
 
     fn try_seek(&mut self, pos: Duration) -> Result<(), super::SeekError> {
diff --git a/src/source/mod.rs b/src/source/mod.rs
index 14e252e7..5e9b6f39 100644
--- a/src/source/mod.rs
+++ b/src/source/mod.rs
@@ -22,7 +22,6 @@ pub use self::from_factory::{from_factory, FromFactoryIter};
 pub use self::from_iter::{from_iter, FromIter};
 pub use self::linear_ramp::LinearGainRamp;
 pub use self::mix::Mix;
-pub use self::noise::{pink, white, PinkNoise, WhiteNoise};
 pub use self::pausable::Pausable;
 pub use self::periodic::PeriodicAccess;
 pub use self::position::TrackPosition;
@@ -35,15 +34,15 @@ pub use self::spatial::Spatial;
 pub use self::speed::Speed;
 pub use self::stoppable::Stoppable;
 pub use self::take::TakeDuration;
-pub use self::test_waveform::{TestWaveform, Function};
+pub use self::test_waveform::{Function, TestWaveform};
 pub use self::uniform::UniformSourceIterator;
 pub use self::zero::Zero;
 
 mod amplify;
 mod blt;
 mod buffered;
-mod chirp;
 mod channel_volume;
+mod chirp;
 mod crossfade;
 mod delay;
 mod done;
@@ -55,7 +54,6 @@ mod from_factory;
 mod from_iter;
 mod linear_ramp;
 mod mix;
-mod noise;
 mod pausable;
 mod periodic;
 mod position;
@@ -72,6 +70,11 @@ mod test_waveform;
 mod uniform;
 mod zero;
 
+#[cfg(feature = "noise")]
+mod noise;
+#[cfg(feature = "noise")]
+pub use self::noise::{pink, white, PinkNoise, WhiteNoise};
+
 /// A source of samples.
 ///
 /// # A quick lesson about sounds
diff --git a/src/source/noise.rs b/src/source/noise.rs
index 434cc998..42ae0e61 100644
--- a/src/source/noise.rs
+++ b/src/source/noise.rs
@@ -1,12 +1,12 @@
 //! Noise sources.
 //!
 //!
+
 use crate::Source;
 
 use super::SeekError;
 
-use rand::rngs::SmallRng;
-use rand::{RngCore, SeedableRng};
+use rand::{rngs::SmallRng, RngCore, SeedableRng};
 
 /// Convenience function to create a new `WhiteNoise` noise source.
 #[inline]
diff --git a/src/source/sine.rs b/src/source/sine.rs
index 9a92b20b..73db5eba 100644
--- a/src/source/sine.rs
+++ b/src/source/sine.rs
@@ -1,6 +1,6 @@
 use std::time::Duration;
 
-use crate::source::{TestWaveform, Function};
+use crate::source::{Function, TestWaveform};
 use crate::Source;
 
 use super::SeekError;
diff --git a/src/source/test_waveform.rs b/src/source/test_waveform.rs
index 420eac58..fea4f508 100644
--- a/src/source/test_waveform.rs
+++ b/src/source/test_waveform.rs
@@ -7,9 +7,9 @@
 //! # Example
 //!
 //! ```
-//! use rodio::source::{TestWaveform,TestWaveformFunction};
+//! use rodio::source::{TestWaveform,Function};
 //!
-//! let tone = TestWaveform::new(cpal::SampleRate(48000), 440.0, TestWaveformFunction::Sine);
+//! let tone = TestWaveform::new(cpal::SampleRate(48000), 440.0, Function::Sine);
 //! ```
 use std::f32::consts::TAU;
 use std::time::Duration;
@@ -68,11 +68,7 @@ impl TestWaveform {
     ///
     /// Will panic if `frequency` is equal to zero.
     #[inline]
-    pub fn new(
-        sample_rate: cpal::SampleRate,
-        frequency: f32,
-        f: Function,
-    ) -> TestWaveform {
+    pub fn new(sample_rate: cpal::SampleRate, frequency: f32, f: Function) -> TestWaveform {
         assert!(frequency != 0.0, "frequency must be greater than zero");
         let period = sample_rate.0 as f32 / frequency;
         TestWaveform {
@@ -89,9 +85,9 @@ impl Iterator for TestWaveform {
 
     #[inline]
     fn next(&mut self) -> Option<f32> {
-        let this_i = self.i;
+        let val = Some(self.function.render(self.i, self.period));
         self.i += 1;
-        Some(self.function.render(this_i, self.period))
+        val
     }
 }
 
@@ -125,16 +121,12 @@ impl Source for TestWaveform {
 
 #[cfg(test)]
 mod tests {
-    use crate::source::{TestWaveform, Function};
+    use crate::source::{Function, TestWaveform};
     use approx::assert_abs_diff_eq;
 
     #[test]
     fn square() {
-        let mut wf = TestWaveform::new(
-            cpal::SampleRate(2000),
-            500.0f32,
-            Function::Square,
-        );
+        let mut wf = TestWaveform::new(cpal::SampleRate(2000), 500.0f32, Function::Square);
         assert_eq!(wf.next(), Some(1.0f32));
         assert_eq!(wf.next(), Some(1.0f32));
         assert_eq!(wf.next(), Some(-1.0f32));
@@ -147,11 +139,7 @@ mod tests {
 
     #[test]
     fn triangle() {
-        let mut wf = TestWaveform::new(
-            cpal::SampleRate(8000),
-            1000.0f32,
-            Function::Triangle,
-        );
+        let mut wf = TestWaveform::new(cpal::SampleRate(8000), 1000.0f32, Function::Triangle);
         assert_eq!(wf.next(), Some(-1.0f32));
         assert_eq!(wf.next(), Some(-0.5f32));
         assert_eq!(wf.next(), Some(0.0f32));
@@ -172,11 +160,7 @@ mod tests {
 
     #[test]
     fn saw() {
-        let mut wf = TestWaveform::new(
-            cpal::SampleRate(200),
-            50.0f32,
-            Function::Sawtooth,
-        );
+        let mut wf = TestWaveform::new(cpal::SampleRate(200), 50.0f32, Function::Sawtooth);
         assert_eq!(wf.next(), Some(0.0f32));
         assert_eq!(wf.next(), Some(0.5f32));
         assert_eq!(wf.next(), Some(-1.0f32));

From e060bdd35c9a5fa5ce91bdf08a3cbacac0454b5d Mon Sep 17 00:00:00 2001
From: Jamie Hardt <jamiehardt@me.com>
Date: Sat, 14 Sep 2024 09:32:51 -0700
Subject: [PATCH 17/31] Implemented chirp generator

---
 CHANGELOG.md        | 13 +++++++++++--
 src/lib.rs          |  9 +++++++++
 src/source/chirp.rs |  8 +++++---
 3 files changed, 25 insertions(+), 5 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 63faa801..03cf51f0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,8 +8,17 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [Unreleased]
 
 ### Added
-- Support for *ALAC/AIFF* 
-- New sources:
+- Support for *ALAC/AIFF*
+- New test signal generator sources:
+    - `TestSignal` source generates a sine, triangle, square wave or sawtooth
+      of a given frequency and sample rate.
+    - `Chirp` source generates a sine wave with linearly period over a given
+      frequency range and duration.
+    - `white` and `pink` generate white or pink noise, respectively. These 
+      sources depend on the `rand` crate  and are guarded with the "noise" 
+      feature.
+    - Documentation for the "noise" feature has been added to `lib.rs`.
+- New Fade and Crossfade sources:
     - `fade_out` fades an input out using a linear gain fade.
     - `linear_gain_ramp` applies a linear gain change to a sound over a
       given duration. `fade_out` is implemented as a `linear_gain_ramp` and
diff --git a/src/lib.rs b/src/lib.rs
index 6f6c505b..c47eafab 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -112,6 +112,15 @@
 //! the number of sinks that can be created (except for the fact that creating too many will slow
 //! down your program).
 //!
+//! 
+//! ## Features 
+//!
+//! Rodio provides several optional features that are guarded with feature gates.
+//!
+//! ### Feature "Noise"
+//!
+//! The "noise" feature adds support for white and pink noise sources. This feature requires the
+//! "rand" crate.
 #![cfg_attr(test, deny(missing_docs))]
 pub use cpal::{
     self, traits::DeviceTrait, Device, Devices, DevicesError, InputDevices, OutputDevices,
diff --git a/src/source/chirp.rs b/src/source/chirp.rs
index 8fabc292..1971c70f 100644
--- a/src/source/chirp.rs
+++ b/src/source/chirp.rs
@@ -1,6 +1,6 @@
 //! Chirp/sweep source.
 
-use std::time::Duration;
+use std::{f32::consts::TAU, time::Duration};
 
 use crate::Source;
 
@@ -48,9 +48,11 @@ impl Iterator for Chirp {
 
     fn next(&mut self) -> Option<Self::Item> {
         let i = self.elapsed_samples;
+        let ratio = self.elapsed_samples as f32 / self.total_samples as f32;
         self.elapsed_samples += 1;
-
-        todo!()
+        let freq = self.start_frequency * (1.0 - ratio) + self.end_frequency * ratio;
+        let t = (i as f32 / self.sample_rate() as f32) * TAU * freq;
+        Some( t.sin() )
     }
 }
 

From f3e77f43ec52dac082d0a362508d01706a767f0c Mon Sep 17 00:00:00 2001
From: Jamie Hardt <jamiehardt@me.com>
Date: Sat, 14 Sep 2024 09:39:02 -0700
Subject: [PATCH 18/31] Removed `try_seek()` from chirp.

---
 src/source/chirp.rs | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/src/source/chirp.rs b/src/source/chirp.rs
index 1971c70f..9942cab4 100644
--- a/src/source/chirp.rs
+++ b/src/source/chirp.rs
@@ -52,7 +52,7 @@ impl Iterator for Chirp {
         self.elapsed_samples += 1;
         let freq = self.start_frequency * (1.0 - ratio) + self.end_frequency * ratio;
         let t = (i as f32 / self.sample_rate() as f32) * TAU * freq;
-        Some( t.sin() )
+        Some(t.sin())
     }
 }
 
@@ -73,8 +73,4 @@ impl Source for Chirp {
         let secs: f64 = self.total_samples as f64 / self.sample_rate.0 as f64;
         Some(Duration::new(1, 0).mul_f64(secs))
     }
-
-    fn try_seek(&mut self, pos: Duration) -> Result<(), super::SeekError> {
-        todo!()
-    }
 }

From c912f567a66bd2a0aa21a0b058087e31c1e47878 Mon Sep 17 00:00:00 2001
From: Jamie Hardt <jamiehardt@me.com>
Date: Sun, 15 Sep 2024 13:26:43 -0700
Subject: [PATCH 19/31] Removed white space for rustfmt

---
 src/lib.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/lib.rs b/src/lib.rs
index c47eafab..6889bd62 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -113,7 +113,7 @@
 //! down your program).
 //!
 //! 
-//! ## Features 
+//! ## Features
 //!
 //! Rodio provides several optional features that are guarded with feature gates.
 //!

From cde724a429a45345200ae654c67644f900077a49 Mon Sep 17 00:00:00 2001
From: Jamie Hardt <jamiehardt@me.com>
Date: Sun, 15 Sep 2024 13:29:15 -0700
Subject: [PATCH 20/31] Removed white space for rustfmt

---
 src/lib.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/lib.rs b/src/lib.rs
index 6889bd62..f9dde615 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -112,7 +112,7 @@
 //! the number of sinks that can be created (except for the fact that creating too many will slow
 //! down your program).
 //!
-//! 
+//!
 //! ## Features
 //!
 //! Rodio provides several optional features that are guarded with feature gates.

From 56fcce74f3d93517c45886097eafdd588ac99a4f Mon Sep 17 00:00:00 2001
From: Jamie Hardt <jamiehardt@me.com>
Date: Sun, 29 Sep 2024 15:40:36 -0700
Subject: [PATCH 21/31] Fixed a typo from @UnknownSuperficialNight

---
 src/source/test_waveform.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/source/test_waveform.rs b/src/source/test_waveform.rs
index fea4f508..ec8db6c2 100644
--- a/src/source/test_waveform.rs
+++ b/src/source/test_waveform.rs
@@ -26,7 +26,7 @@ pub enum Function {
     Triangle,
     /// A square wave, rising edge at t=0.
     Square,
-    /// A rising swatooth wave.
+    /// A rising sawtooth wave.
     Sawtooth,
 }
 

From b373f5253afdfeb51e14b409abc3fcc0cc561aa7 Mon Sep 17 00:00:00 2001
From: Jamie Hardt <jamiehardt@me.com>
Date: Sun, 29 Sep 2024 16:02:07 -0700
Subject: [PATCH 22/31] Moved "noise" feature documentation

...into the previous "Optional Features" block
---
 src/lib.rs | 16 +++++++---------
 1 file changed, 7 insertions(+), 9 deletions(-)

diff --git a/src/lib.rs b/src/lib.rs
index d6742eab..ecff98a8 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -110,6 +110,11 @@
 //! The "tracing" feature replaces the print to stderr when a stream error happens with a
 //! recording an error event with tracing.
 //!
+//! ### Feature "Noise"
+//!
+//! The "noise" feature adds support for white and pink noise sources. This feature requires the
+//! "rand" crate.
+//! 
 //! ## How it works under the hood
 //!
 //! Rodio spawns a background thread that is dedicated to reading from the sources and sending
@@ -121,15 +126,8 @@
 //! the number of sinks that can be created (except for the fact that creating too many will slow
 //! down your program).
 //!
-//!
-//! ## Features
-//!
-//! Rodio provides several optional features that are guarded with feature gates.
-//!
-//! ### Feature "Noise"
-//!
-//! The "noise" feature adds support for white and pink noise sources. This feature requires the
-//! "rand" crate.
+
+
 #![cfg_attr(test, deny(missing_docs))]
 pub use cpal::{
     self, traits::DeviceTrait, Device, Devices, DevicesError, InputDevices, OutputDevices,

From 5fa0188cc361a7a36b511b6781d49b4496dad648 Mon Sep 17 00:00:00 2001
From: Jamie Hardt <jamiehardt@me.com>
Date: Sun, 29 Sep 2024 16:15:41 -0700
Subject: [PATCH 23/31] Added signal_generator.rs example

---
 examples/signal_generator.rs | 83 ++++++++++++++++++++++++++++++++++++
 1 file changed, 83 insertions(+)
 create mode 100644 examples/signal_generator.rs

diff --git a/examples/signal_generator.rs b/examples/signal_generator.rs
new file mode 100644
index 00000000..ca761937
--- /dev/null
+++ b/examples/signal_generator.rs
@@ -0,0 +1,83 @@
+//! Noise generator example. Use the "noise" feature to enable the noise generator sources.
+
+fn main() {
+    use rodio::source::{chirp, Function, Source, TestWaveform};
+    use std::thread;
+    use std::time::Duration;
+
+    let (_stream, stream_handle) = rodio::OutputStream::try_default().unwrap();
+
+    let noise_duration = Duration::from_millis(1000);
+    let interval_duration = Duration::from_millis(1500);
+
+    println!("Playing 1000 Hz tone");
+    stream_handle
+        .play_raw(
+            TestWaveform::new(cpal::SampleRate(48000), 1000.0, Function::Sine)
+                .amplify(0.1)
+                .take_duration(noise_duration),
+        )
+        .unwrap();
+
+    thread::sleep(interval_duration);
+
+    println!("Playing 10,000 Hz tone");
+    stream_handle
+        .play_raw(
+            TestWaveform::new(cpal::SampleRate(48000), 10000.0, Function::Sine)
+                .amplify(0.1)
+                .take_duration(noise_duration),
+        )
+        .unwrap();
+
+    thread::sleep(interval_duration);
+
+    println!("Playing 440 Hz Triangle Wave");
+    stream_handle
+        .play_raw(
+            TestWaveform::new(cpal::SampleRate(48000), 440.0, Function::Triangle)
+                .amplify(0.1)
+                .take_duration(noise_duration),
+        )
+        .unwrap();
+
+    thread::sleep(interval_duration);
+
+    println!("Playing 440 Hz Sawtooth Wave");
+    stream_handle
+        .play_raw(
+            TestWaveform::new(cpal::SampleRate(48000), 440.0, Function::Sawtooth)
+                .amplify(0.1)
+                .take_duration(noise_duration),
+        )
+        .unwrap();
+
+    thread::sleep(interval_duration);
+
+    println!("Playing 440 Hz Square Wave");
+    stream_handle
+        .play_raw(
+            TestWaveform::new(cpal::SampleRate(48000), 440.0, Function::Square)
+                .amplify(0.1)
+                .take_duration(noise_duration),
+        )
+        .unwrap();
+
+    thread::sleep(interval_duration);
+
+    println!("Playing 20-10000 Hz Sweep");
+    stream_handle
+        .play_raw(
+            chirp(
+                cpal::SampleRate(48000),
+                20.0,
+                10000.0,
+                Duration::from_secs(1),
+            )
+            .amplify(0.1)
+            .take_duration(noise_duration),
+        )
+        .unwrap();
+
+    thread::sleep(interval_duration);
+}

From 371bbda49e4df18276b7fe91be2525cd5bc40065 Mon Sep 17 00:00:00 2001
From: Jamie Hardt <jamiehardt@me.com>
Date: Sun, 29 Sep 2024 16:18:42 -0700
Subject: [PATCH 24/31] Some cosmetic changes for rustfmt

---
 src/lib.rs | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/lib.rs b/src/lib.rs
index ecff98a8..822d5e35 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -114,7 +114,7 @@
 //!
 //! The "noise" feature adds support for white and pink noise sources. This feature requires the
 //! "rand" crate.
-//! 
+//!
 //! ## How it works under the hood
 //!
 //! Rodio spawns a background thread that is dedicated to reading from the sources and sending
@@ -125,7 +125,6 @@
 //! hardware. Therefore there is no restriction on the number of sounds that play simultaneously or
 //! the number of sinks that can be created (except for the fact that creating too many will slow
 //! down your program).
-//!
 
 
 #![cfg_attr(test, deny(missing_docs))]

From 9d20ea21f197753f60d6d1ac2f22ba6360beede3 Mon Sep 17 00:00:00 2001
From: Jamie Hardt <jamiehardt@me.com>
Date: Sun, 29 Sep 2024 16:23:52 -0700
Subject: [PATCH 25/31] One more tweak for rustfmt

---
 src/lib.rs | 1 -
 1 file changed, 1 deletion(-)

diff --git a/src/lib.rs b/src/lib.rs
index 822d5e35..10ef60dd 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -126,7 +126,6 @@
 //! the number of sinks that can be created (except for the fact that creating too many will slow
 //! down your program).
 
-
 #![cfg_attr(test, deny(missing_docs))]
 pub use cpal::{
     self, traits::DeviceTrait, Device, Devices, DevicesError, InputDevices, OutputDevices,

From 44cb217d48e65f3a2484b865a2f3b0b94ea45333 Mon Sep 17 00:00:00 2001
From: Jamie Hardt <jamiehardt@me.com>
Date: Sun, 29 Sep 2024 16:45:29 -0700
Subject: [PATCH 26/31] Code review changes

---
 CHANGELOG.md                 |  6 +++---
 examples/signal_generator.rs | 16 ++++++++--------
 src/source/sine.rs           |  8 ++++----
 src/source/test_waveform.rs  | 10 +++++-----
 4 files changed, 20 insertions(+), 20 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 390bfa03..b1567d48 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,10 +12,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - New test signal generator sources:
     - `TestSignal` source generates a sine, triangle, square wave or sawtooth
       of a given frequency and sample rate.
-    - `Chirp` source generates a sine wave with linearly period over a given
-      frequency range and duration.
+    - `Chirp` source generates a sine wave with a linearly-increasing 
+      frequency over a given frequency range and duration.
     - `white` and `pink` generate white or pink noise, respectively. These 
-      sources depend on the `rand` crate  and are guarded with the "noise" 
+      sources depend on the `rand` crate and are guarded with the "noise" 
       feature.
     - Documentation for the "noise" feature has been added to `lib.rs`.
 - New Fade and Crossfade sources:
diff --git a/examples/signal_generator.rs b/examples/signal_generator.rs
index ca761937..d17f1675 100644
--- a/examples/signal_generator.rs
+++ b/examples/signal_generator.rs
@@ -1,4 +1,4 @@
-//! Noise generator example. Use the "noise" feature to enable the noise generator sources.
+//! Test signal generator example.
 
 fn main() {
     use rodio::source::{chirp, Function, Source, TestWaveform};
@@ -7,7 +7,7 @@ fn main() {
 
     let (_stream, stream_handle) = rodio::OutputStream::try_default().unwrap();
 
-    let noise_duration = Duration::from_millis(1000);
+    let test_signal_duration = Duration::from_millis(1000);
     let interval_duration = Duration::from_millis(1500);
 
     println!("Playing 1000 Hz tone");
@@ -15,7 +15,7 @@ fn main() {
         .play_raw(
             TestWaveform::new(cpal::SampleRate(48000), 1000.0, Function::Sine)
                 .amplify(0.1)
-                .take_duration(noise_duration),
+                .take_duration(test_signal_duration),
         )
         .unwrap();
 
@@ -26,7 +26,7 @@ fn main() {
         .play_raw(
             TestWaveform::new(cpal::SampleRate(48000), 10000.0, Function::Sine)
                 .amplify(0.1)
-                .take_duration(noise_duration),
+                .take_duration(test_signal_duration),
         )
         .unwrap();
 
@@ -37,7 +37,7 @@ fn main() {
         .play_raw(
             TestWaveform::new(cpal::SampleRate(48000), 440.0, Function::Triangle)
                 .amplify(0.1)
-                .take_duration(noise_duration),
+                .take_duration(test_signal_duration),
         )
         .unwrap();
 
@@ -48,7 +48,7 @@ fn main() {
         .play_raw(
             TestWaveform::new(cpal::SampleRate(48000), 440.0, Function::Sawtooth)
                 .amplify(0.1)
-                .take_duration(noise_duration),
+                .take_duration(test_signal_duration),
         )
         .unwrap();
 
@@ -59,7 +59,7 @@ fn main() {
         .play_raw(
             TestWaveform::new(cpal::SampleRate(48000), 440.0, Function::Square)
                 .amplify(0.1)
-                .take_duration(noise_duration),
+                .take_duration(test_signal_duration),
         )
         .unwrap();
 
@@ -75,7 +75,7 @@ fn main() {
                 Duration::from_secs(1),
             )
             .amplify(0.1)
-            .take_duration(noise_duration),
+            .take_duration(test_signal_duration),
         )
         .unwrap();
 
diff --git a/src/source/sine.rs b/src/source/sine.rs
index 73db5eba..b9b97caa 100644
--- a/src/source/sine.rs
+++ b/src/source/sine.rs
@@ -5,8 +5,6 @@ use crate::Source;
 
 use super::SeekError;
 
-const SAMPLE_RATE: u32 = 48000;
-
 /// An infinite source that produces a sine.
 ///
 /// Always has a rate of 48kHz and one channel.
@@ -16,10 +14,12 @@ pub struct SineWave {
 }
 
 impl SineWave {
+    const SAMPLE_RATE: u32 = 48000;
+
     /// The frequency of the sine.
     #[inline]
     pub fn new(freq: f32) -> SineWave {
-        let sr = cpal::SampleRate(SAMPLE_RATE);
+        let sr = cpal::SampleRate(Self::SAMPLE_RATE);
         SineWave {
             test_sine: TestWaveform::new(sr, freq, Function::Sine),
         }
@@ -48,7 +48,7 @@ impl Source for SineWave {
 
     #[inline]
     fn sample_rate(&self) -> u32 {
-        SAMPLE_RATE
+        Self::SAMPLE_RATE
     }
 
     #[inline]
diff --git a/src/source/test_waveform.rs b/src/source/test_waveform.rs
index ec8db6c2..bcd4799c 100644
--- a/src/source/test_waveform.rs
+++ b/src/source/test_waveform.rs
@@ -34,19 +34,19 @@ impl Function {
     /// Create a single sample for the given waveform
     #[inline]
     fn render(&self, i: u64, period: f32) -> f32 {
-        let i_div_p: f32 = i as f32 / period;
+        let cycle_pos: f32 = i as f32 / period;
 
         match self {
-            Self::Sine => (TAU * i_div_p).sin(),
-            Self::Triangle => 4.0f32 * (i_div_p - (i_div_p + 0.5f32).floor()).abs() - 1f32,
+            Self::Sine => (TAU * cycle_pos).sin(),
+            Self::Triangle => 4.0f32 * (cycle_pos - (cycle_pos + 0.5f32).floor()).abs() - 1f32,
             Self::Square => {
-                if i_div_p % 1.0f32 < 0.5f32 {
+                if cycle_pos % 1.0f32 < 0.5f32 {
                     1.0f32
                 } else {
                     -1.0f32
                 }
             }
-            Self::Sawtooth => 2.0f32 * (i_div_p - (i_div_p + 0.5f32).floor()),
+            Self::Sawtooth => 2.0f32 * (cycle_pos - (cycle_pos + 0.5f32).floor()),
         }
     }
 }

From 15cca7338859dfa08fbff22ae6bec996974876a2 Mon Sep 17 00:00:00 2001
From: David Kleingeld <git@davidsk.dev>
Date: Tue, 1 Oct 2024 02:35:16 +0200
Subject: [PATCH 27/31] Add dependency notice (libalsa on linux) to readme

---
 README.md | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/README.md b/README.md
index 614ab1fb..91b03693 100644
--- a/README.md
+++ b/README.md
@@ -20,6 +20,10 @@ See [the docs](https://docs.rs/rodio/latest/rodio/#alternative-decoder-backends)
 
 [The documentation](http://docs.rs/rodio) contains an introduction to the library.
 
+## Dependencies(Linux only)
+
+Rodio uses `cpal` to send audio to the OS for playback. On Linux `cpal` needs the ALSA development files. These are provided as part of the libasound2-dev package on Debian and Ubuntu distributions and alsa-lib-devel on Fedora.
+
 ## License
 [License]: #license
 

From 8899e6709fa50e7d70136ea8029217e9feafefd2 Mon Sep 17 00:00:00 2001
From: Jamie Hardt <jamiehardt@me.com>
Date: Mon, 30 Sep 2024 21:45:30 -0700
Subject: [PATCH 28/31] Renamed TestWaveform to SignalGenerator

---
 examples/signal_generator.rs |  12 +--
 src/source/mod.rs            |   4 +-
 src/source/sine.rs           |   6 +-
 src/source/test_waveform.rs  | 185 -----------------------------------
 4 files changed, 11 insertions(+), 196 deletions(-)
 delete mode 100644 src/source/test_waveform.rs

diff --git a/examples/signal_generator.rs b/examples/signal_generator.rs
index d17f1675..802fd582 100644
--- a/examples/signal_generator.rs
+++ b/examples/signal_generator.rs
@@ -1,7 +1,7 @@
 //! Test signal generator example.
 
 fn main() {
-    use rodio::source::{chirp, Function, Source, TestWaveform};
+    use rodio::source::{chirp, Function, Source, SignalGenerator};
     use std::thread;
     use std::time::Duration;
 
@@ -13,7 +13,7 @@ fn main() {
     println!("Playing 1000 Hz tone");
     stream_handle
         .play_raw(
-            TestWaveform::new(cpal::SampleRate(48000), 1000.0, Function::Sine)
+            SignalGenerator::new(cpal::SampleRate(48000), 1000.0, Function::Sine)
                 .amplify(0.1)
                 .take_duration(test_signal_duration),
         )
@@ -24,7 +24,7 @@ fn main() {
     println!("Playing 10,000 Hz tone");
     stream_handle
         .play_raw(
-            TestWaveform::new(cpal::SampleRate(48000), 10000.0, Function::Sine)
+            SignalGenerator::new(cpal::SampleRate(48000), 10000.0, Function::Sine)
                 .amplify(0.1)
                 .take_duration(test_signal_duration),
         )
@@ -35,7 +35,7 @@ fn main() {
     println!("Playing 440 Hz Triangle Wave");
     stream_handle
         .play_raw(
-            TestWaveform::new(cpal::SampleRate(48000), 440.0, Function::Triangle)
+            SignalGenerator::new(cpal::SampleRate(48000), 440.0, Function::Triangle)
                 .amplify(0.1)
                 .take_duration(test_signal_duration),
         )
@@ -46,7 +46,7 @@ fn main() {
     println!("Playing 440 Hz Sawtooth Wave");
     stream_handle
         .play_raw(
-            TestWaveform::new(cpal::SampleRate(48000), 440.0, Function::Sawtooth)
+            SignalGenerator::new(cpal::SampleRate(48000), 440.0, Function::Sawtooth)
                 .amplify(0.1)
                 .take_duration(test_signal_duration),
         )
@@ -57,7 +57,7 @@ fn main() {
     println!("Playing 440 Hz Square Wave");
     stream_handle
         .play_raw(
-            TestWaveform::new(cpal::SampleRate(48000), 440.0, Function::Square)
+            SignalGenerator::new(cpal::SampleRate(48000), 440.0, Function::Square)
                 .amplify(0.1)
                 .take_duration(test_signal_duration),
         )
diff --git a/src/source/mod.rs b/src/source/mod.rs
index 8a2f728f..d91cabf2 100644
--- a/src/source/mod.rs
+++ b/src/source/mod.rs
@@ -34,7 +34,7 @@ pub use self::spatial::Spatial;
 pub use self::speed::Speed;
 pub use self::stoppable::Stoppable;
 pub use self::take::TakeDuration;
-pub use self::test_waveform::{Function, TestWaveform};
+pub use self::signal_generator::{Function, SignalGenerator};
 pub use self::uniform::UniformSourceIterator;
 pub use self::zero::Zero;
 
@@ -66,7 +66,7 @@ mod spatial;
 mod speed;
 mod stoppable;
 mod take;
-mod test_waveform;
+mod signal_generator;
 mod uniform;
 mod zero;
 
diff --git a/src/source/sine.rs b/src/source/sine.rs
index b9b97caa..b7591900 100644
--- a/src/source/sine.rs
+++ b/src/source/sine.rs
@@ -1,6 +1,6 @@
 use std::time::Duration;
 
-use crate::source::{Function, TestWaveform};
+use crate::source::{Function, SignalGenerator};
 use crate::Source;
 
 use super::SeekError;
@@ -10,7 +10,7 @@ use super::SeekError;
 /// Always has a rate of 48kHz and one channel.
 #[derive(Clone, Debug)]
 pub struct SineWave {
-    test_sine: TestWaveform,
+    test_sine: SignalGenerator,
 }
 
 impl SineWave {
@@ -21,7 +21,7 @@ impl SineWave {
     pub fn new(freq: f32) -> SineWave {
         let sr = cpal::SampleRate(Self::SAMPLE_RATE);
         SineWave {
-            test_sine: TestWaveform::new(sr, freq, Function::Sine),
+            test_sine: SignalGenerator::new(sr, freq, Function::Sine),
         }
     }
 }
diff --git a/src/source/test_waveform.rs b/src/source/test_waveform.rs
deleted file mode 100644
index bcd4799c..00000000
--- a/src/source/test_waveform.rs
+++ /dev/null
@@ -1,185 +0,0 @@
-//! Generator sources for various periodic test waveforms.
-//!
-//! This module provides several periodic, deterministic waveforms for testing other sources and
-//! for simple additive sound synthesis. Every source is monoaural and in the codomain [-1.0f32,
-//! 1.0f32].
-//!
-//! # Example
-//!
-//! ```
-//! use rodio::source::{TestWaveform,Function};
-//!
-//! let tone = TestWaveform::new(cpal::SampleRate(48000), 440.0, Function::Sine);
-//! ```
-use std::f32::consts::TAU;
-use std::time::Duration;
-
-use super::SeekError;
-use crate::Source;
-
-/// Waveform functions.
-#[derive(Clone, Debug)]
-pub enum Function {
-    /// A sinusoidal waveform.
-    Sine,
-    /// A triangle waveform.
-    Triangle,
-    /// A square wave, rising edge at t=0.
-    Square,
-    /// A rising sawtooth wave.
-    Sawtooth,
-}
-
-impl Function {
-    /// Create a single sample for the given waveform
-    #[inline]
-    fn render(&self, i: u64, period: f32) -> f32 {
-        let cycle_pos: f32 = i as f32 / period;
-
-        match self {
-            Self::Sine => (TAU * cycle_pos).sin(),
-            Self::Triangle => 4.0f32 * (cycle_pos - (cycle_pos + 0.5f32).floor()).abs() - 1f32,
-            Self::Square => {
-                if cycle_pos % 1.0f32 < 0.5f32 {
-                    1.0f32
-                } else {
-                    -1.0f32
-                }
-            }
-            Self::Sawtooth => 2.0f32 * (cycle_pos - (cycle_pos + 0.5f32).floor()),
-        }
-    }
-}
-
-/// An infinite source that produces one of a selection of test waveforms.
-#[derive(Clone, Debug)]
-pub struct TestWaveform {
-    sample_rate: cpal::SampleRate,
-    period: f32,
-    function: Function,
-    i: u64,
-}
-
-impl TestWaveform {
-    /// Create a new `TestWaveform` object that generates an endless waveform
-    /// `f`.
-    ///
-    /// # Panics
-    ///
-    /// Will panic if `frequency` is equal to zero.
-    #[inline]
-    pub fn new(sample_rate: cpal::SampleRate, frequency: f32, f: Function) -> TestWaveform {
-        assert!(frequency != 0.0, "frequency must be greater than zero");
-        let period = sample_rate.0 as f32 / frequency;
-        TestWaveform {
-            sample_rate,
-            period,
-            function: f,
-            i: 0,
-        }
-    }
-}
-
-impl Iterator for TestWaveform {
-    type Item = f32;
-
-    #[inline]
-    fn next(&mut self) -> Option<f32> {
-        let val = Some(self.function.render(self.i, self.period));
-        self.i += 1;
-        val
-    }
-}
-
-impl Source for TestWaveform {
-    #[inline]
-    fn current_frame_len(&self) -> Option<usize> {
-        None
-    }
-
-    #[inline]
-    fn channels(&self) -> u16 {
-        1
-    }
-
-    #[inline]
-    fn sample_rate(&self) -> u32 {
-        self.sample_rate.0
-    }
-
-    #[inline]
-    fn total_duration(&self) -> Option<Duration> {
-        None
-    }
-
-    #[inline]
-    fn try_seek(&mut self, duration: Duration) -> Result<(), SeekError> {
-        self.i = (self.sample_rate.0 as f32 * duration.as_secs_f32()) as u64;
-        Ok(())
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use crate::source::{Function, TestWaveform};
-    use approx::assert_abs_diff_eq;
-
-    #[test]
-    fn square() {
-        let mut wf = TestWaveform::new(cpal::SampleRate(2000), 500.0f32, Function::Square);
-        assert_eq!(wf.next(), Some(1.0f32));
-        assert_eq!(wf.next(), Some(1.0f32));
-        assert_eq!(wf.next(), Some(-1.0f32));
-        assert_eq!(wf.next(), Some(-1.0f32));
-        assert_eq!(wf.next(), Some(1.0f32));
-        assert_eq!(wf.next(), Some(1.0f32));
-        assert_eq!(wf.next(), Some(-1.0f32));
-        assert_eq!(wf.next(), Some(-1.0f32));
-    }
-
-    #[test]
-    fn triangle() {
-        let mut wf = TestWaveform::new(cpal::SampleRate(8000), 1000.0f32, Function::Triangle);
-        assert_eq!(wf.next(), Some(-1.0f32));
-        assert_eq!(wf.next(), Some(-0.5f32));
-        assert_eq!(wf.next(), Some(0.0f32));
-        assert_eq!(wf.next(), Some(0.5f32));
-        assert_eq!(wf.next(), Some(1.0f32));
-        assert_eq!(wf.next(), Some(0.5f32));
-        assert_eq!(wf.next(), Some(0.0f32));
-        assert_eq!(wf.next(), Some(-0.5f32));
-        assert_eq!(wf.next(), Some(-1.0f32));
-        assert_eq!(wf.next(), Some(-0.5f32));
-        assert_eq!(wf.next(), Some(0.0f32));
-        assert_eq!(wf.next(), Some(0.5f32));
-        assert_eq!(wf.next(), Some(1.0f32));
-        assert_eq!(wf.next(), Some(0.5f32));
-        assert_eq!(wf.next(), Some(0.0f32));
-        assert_eq!(wf.next(), Some(-0.5f32));
-    }
-
-    #[test]
-    fn saw() {
-        let mut wf = TestWaveform::new(cpal::SampleRate(200), 50.0f32, Function::Sawtooth);
-        assert_eq!(wf.next(), Some(0.0f32));
-        assert_eq!(wf.next(), Some(0.5f32));
-        assert_eq!(wf.next(), Some(-1.0f32));
-        assert_eq!(wf.next(), Some(-0.5f32));
-        assert_eq!(wf.next(), Some(0.0f32));
-        assert_eq!(wf.next(), Some(0.5f32));
-        assert_eq!(wf.next(), Some(-1.0f32));
-    }
-
-    #[test]
-    fn sine() {
-        let mut wf = TestWaveform::new(cpal::SampleRate(1000), 100f32, Function::Sine);
-
-        assert_abs_diff_eq!(wf.next().unwrap(), 0.0f32);
-        assert_abs_diff_eq!(wf.next().unwrap(), 0.58778525f32);
-        assert_abs_diff_eq!(wf.next().unwrap(), 0.95105652f32);
-        assert_abs_diff_eq!(wf.next().unwrap(), 0.95105652f32);
-        assert_abs_diff_eq!(wf.next().unwrap(), 0.58778525f32);
-        assert_abs_diff_eq!(wf.next().unwrap(), 0.0f32);
-        assert_abs_diff_eq!(wf.next().unwrap(), -0.58778554f32);
-    }
-}

From a1fa144f579243e052e71b399907c0b46adbae0b Mon Sep 17 00:00:00 2001
From: Jamie Hardt <jamiehardt@me.com>
Date: Mon, 30 Sep 2024 21:50:30 -0700
Subject: [PATCH 29/31] Adding renamed signal_generator.rs

---
 src/source/signal_generator.rs | 185 +++++++++++++++++++++++++++++++++
 1 file changed, 185 insertions(+)
 create mode 100644 src/source/signal_generator.rs

diff --git a/src/source/signal_generator.rs b/src/source/signal_generator.rs
new file mode 100644
index 00000000..54969ed5
--- /dev/null
+++ b/src/source/signal_generator.rs
@@ -0,0 +1,185 @@
+//! Generator sources for various periodic test waveforms.
+//!
+//! This module provides several periodic, deterministic waveforms for testing other sources and
+//! for simple additive sound synthesis. Every source is monoaural and in the codomain [-1.0f32,
+//! 1.0f32].
+//!
+//! # Example
+//!
+//! ```
+//! use rodio::source::{SignalGenerator,Function};
+//!
+//! let tone = SignalGenerator::new(cpal::SampleRate(48000), 440.0, Function::Sine);
+//! ```
+use std::f32::consts::TAU;
+use std::time::Duration;
+
+use super::SeekError;
+use crate::Source;
+
+/// Waveform functions.
+#[derive(Clone, Debug)]
+pub enum Function {
+    /// A sinusoidal waveform.
+    Sine,
+    /// A triangle waveform.
+    Triangle,
+    /// A square wave, rising edge at t=0.
+    Square,
+    /// A rising sawtooth wave.
+    Sawtooth,
+}
+
+impl Function {
+    /// Create a single sample for the given waveform
+    #[inline]
+    fn render(&self, i: u64, period: f32) -> f32 {
+        let cycle_pos: f32 = i as f32 / period;
+
+        match self {
+            Self::Sine => (TAU * cycle_pos).sin(),
+            Self::Triangle => 4.0f32 * (cycle_pos - (cycle_pos + 0.5f32).floor()).abs() - 1f32,
+            Self::Square => {
+                if cycle_pos % 1.0f32 < 0.5f32 {
+                    1.0f32
+                } else {
+                    -1.0f32
+                }
+            }
+            Self::Sawtooth => 2.0f32 * (cycle_pos - (cycle_pos + 0.5f32).floor()),
+        }
+    }
+}
+
+/// An infinite source that produces one of a selection of test waveforms.
+#[derive(Clone, Debug)]
+pub struct SignalGenerator {
+    sample_rate: cpal::SampleRate,
+    period: f32,
+    function: Function,
+    i: u64,
+}
+
+impl SignalGenerator {
+    /// Create a new `TestWaveform` object that generates an endless waveform
+    /// `f`.
+    ///
+    /// # Panics
+    ///
+    /// Will panic if `frequency` is equal to zero.
+    #[inline]
+    pub fn new(sample_rate: cpal::SampleRate, frequency: f32, f: Function) -> SignalGenerator {
+        assert!(frequency != 0.0, "frequency must be greater than zero");
+        let period = sample_rate.0 as f32 / frequency;
+        SignalGenerator {
+            sample_rate,
+            period,
+            function: f,
+            i: 0,
+        }
+    }
+}
+
+impl Iterator for SignalGenerator {
+    type Item = f32;
+
+    #[inline]
+    fn next(&mut self) -> Option<f32> {
+        let val = Some(self.function.render(self.i, self.period));
+        self.i += 1;
+        val
+    }
+}
+
+impl Source for SignalGenerator {
+    #[inline]
+    fn current_frame_len(&self) -> Option<usize> {
+        None
+    }
+
+    #[inline]
+    fn channels(&self) -> u16 {
+        1
+    }
+
+    #[inline]
+    fn sample_rate(&self) -> u32 {
+        self.sample_rate.0
+    }
+
+    #[inline]
+    fn total_duration(&self) -> Option<Duration> {
+        None
+    }
+
+    #[inline]
+    fn try_seek(&mut self, duration: Duration) -> Result<(), SeekError> {
+        self.i = (self.sample_rate.0 as f32 * duration.as_secs_f32()) as u64;
+        Ok(())
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::source::{Function, SignalGenerator};
+    use approx::assert_abs_diff_eq;
+
+    #[test]
+    fn square() {
+        let mut wf = SignalGenerator::new(cpal::SampleRate(2000), 500.0f32, Function::Square);
+        assert_eq!(wf.next(), Some(1.0f32));
+        assert_eq!(wf.next(), Some(1.0f32));
+        assert_eq!(wf.next(), Some(-1.0f32));
+        assert_eq!(wf.next(), Some(-1.0f32));
+        assert_eq!(wf.next(), Some(1.0f32));
+        assert_eq!(wf.next(), Some(1.0f32));
+        assert_eq!(wf.next(), Some(-1.0f32));
+        assert_eq!(wf.next(), Some(-1.0f32));
+    }
+
+    #[test]
+    fn triangle() {
+        let mut wf = SignalGenerator::new(cpal::SampleRate(8000), 1000.0f32, Function::Triangle);
+        assert_eq!(wf.next(), Some(-1.0f32));
+        assert_eq!(wf.next(), Some(-0.5f32));
+        assert_eq!(wf.next(), Some(0.0f32));
+        assert_eq!(wf.next(), Some(0.5f32));
+        assert_eq!(wf.next(), Some(1.0f32));
+        assert_eq!(wf.next(), Some(0.5f32));
+        assert_eq!(wf.next(), Some(0.0f32));
+        assert_eq!(wf.next(), Some(-0.5f32));
+        assert_eq!(wf.next(), Some(-1.0f32));
+        assert_eq!(wf.next(), Some(-0.5f32));
+        assert_eq!(wf.next(), Some(0.0f32));
+        assert_eq!(wf.next(), Some(0.5f32));
+        assert_eq!(wf.next(), Some(1.0f32));
+        assert_eq!(wf.next(), Some(0.5f32));
+        assert_eq!(wf.next(), Some(0.0f32));
+        assert_eq!(wf.next(), Some(-0.5f32));
+    }
+
+    #[test]
+    fn saw() {
+        let mut wf = SignalGenerator::new(cpal::SampleRate(200), 50.0f32, Function::Sawtooth);
+        assert_eq!(wf.next(), Some(0.0f32));
+        assert_eq!(wf.next(), Some(0.5f32));
+        assert_eq!(wf.next(), Some(-1.0f32));
+        assert_eq!(wf.next(), Some(-0.5f32));
+        assert_eq!(wf.next(), Some(0.0f32));
+        assert_eq!(wf.next(), Some(0.5f32));
+        assert_eq!(wf.next(), Some(-1.0f32));
+    }
+
+    #[test]
+    fn sine() {
+        let mut wf = SignalGenerator::new(cpal::SampleRate(1000), 100f32, Function::Sine);
+
+        assert_abs_diff_eq!(wf.next().unwrap(), 0.0f32);
+        assert_abs_diff_eq!(wf.next().unwrap(), 0.58778525f32);
+        assert_abs_diff_eq!(wf.next().unwrap(), 0.95105652f32);
+        assert_abs_diff_eq!(wf.next().unwrap(), 0.95105652f32);
+        assert_abs_diff_eq!(wf.next().unwrap(), 0.58778525f32);
+        assert_abs_diff_eq!(wf.next().unwrap(), 0.0f32);
+        assert_abs_diff_eq!(wf.next().unwrap(), -0.58778554f32);
+    }
+}

From 322bdd5f5f66d1930f09e193fc1f48314ec11626 Mon Sep 17 00:00:00 2001
From: Jamie Hardt <jamiehardt@me.com>
Date: Mon, 30 Sep 2024 21:59:44 -0700
Subject: [PATCH 30/31] Rustfmt and a doc comment

---
 src/source/mod.rs  | 4 ++--
 src/source/sine.rs | 7 +++++--
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/src/source/mod.rs b/src/source/mod.rs
index d91cabf2..932bec4c 100644
--- a/src/source/mod.rs
+++ b/src/source/mod.rs
@@ -27,6 +27,7 @@ pub use self::periodic::PeriodicAccess;
 pub use self::position::TrackPosition;
 pub use self::repeat::Repeat;
 pub use self::samples_converter::SamplesConverter;
+pub use self::signal_generator::{Function, SignalGenerator};
 pub use self::sine::SineWave;
 pub use self::skip::SkipDuration;
 pub use self::skippable::Skippable;
@@ -34,7 +35,6 @@ pub use self::spatial::Spatial;
 pub use self::speed::Speed;
 pub use self::stoppable::Stoppable;
 pub use self::take::TakeDuration;
-pub use self::signal_generator::{Function, SignalGenerator};
 pub use self::uniform::UniformSourceIterator;
 pub use self::zero::Zero;
 
@@ -59,6 +59,7 @@ mod periodic;
 mod position;
 mod repeat;
 mod samples_converter;
+mod signal_generator;
 mod sine;
 mod skip;
 mod skippable;
@@ -66,7 +67,6 @@ mod spatial;
 mod speed;
 mod stoppable;
 mod take;
-mod signal_generator;
 mod uniform;
 mod zero;
 
diff --git a/src/source/sine.rs b/src/source/sine.rs
index b7591900..da4f8b2c 100644
--- a/src/source/sine.rs
+++ b/src/source/sine.rs
@@ -56,8 +56,11 @@ impl Source for SineWave {
         None
     }
 
+    /// `try_seek()` does nothing on the sine generator. If you need to
+    /// generate a sine tone with a precise phase or sample offset, consider
+    /// using `skip::skip_samples()`.
     #[inline]
-    fn try_seek(&mut self, pos: Duration) -> Result<(), SeekError> {
-        self.test_sine.try_seek(pos)
+    fn try_seek(&mut self, _: Duration) -> Result<(), SeekError> {
+        Ok(())
     }
 }

From 135024650ebeac215a36e0876a8d52dde4c597fa Mon Sep 17 00:00:00 2001
From: Jamie Hardt <jamiehardt@me.com>
Date: Mon, 30 Sep 2024 22:02:46 -0700
Subject: [PATCH 31/31] rustfmt

---
 examples/signal_generator.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/examples/signal_generator.rs b/examples/signal_generator.rs
index 802fd582..08fd4769 100644
--- a/examples/signal_generator.rs
+++ b/examples/signal_generator.rs
@@ -1,7 +1,7 @@
 //! Test signal generator example.
 
 fn main() {
-    use rodio::source::{chirp, Function, Source, SignalGenerator};
+    use rodio::source::{chirp, Function, SignalGenerator, Source};
     use std::thread;
     use std::time::Duration;