From 8aaab0a210e616a0a2ff7b6f40cf7f3510886dd1 Mon Sep 17 00:00:00 2001
From: JasonLG1979 <jasonlevigray3@gmail.com>
Date: Sun, 3 Sep 2023 17:32:55 -0500
Subject: [PATCH] More touch ups

---
 playback/src/config.rs              |   29 +-
 playback/src/filter_coefficients.rs | 2510 +++++++++++++--------------
 playback/src/normaliser.rs          |   61 +-
 playback/src/resampler.rs           |  232 ++-
 playback/src/sample_pipeline.rs     |  130 +-
 5 files changed, 1498 insertions(+), 1464 deletions(-)

diff --git a/playback/src/config.rs b/playback/src/config.rs
index 6f9eb256..20f5a1f5 100644
--- a/playback/src/config.rs
+++ b/playback/src/config.rs
@@ -8,10 +8,14 @@ use crate::{
     RESAMPLER_INPUT_SIZE, SAMPLE_RATE,
 };
 
-// Reciprocals allow us to multiply instead of divide during interpolation.
-const HZ48000_RESAMPLE_FACTOR_RECIPROCAL: f64 = SAMPLE_RATE as f64 / 48_000.0;
-const HZ88200_RESAMPLE_FACTOR_RECIPROCAL: f64 = SAMPLE_RATE as f64 / 88_200.0;
-const HZ96000_RESAMPLE_FACTOR_RECIPROCAL: f64 = SAMPLE_RATE as f64 / 96_000.0;
+const HZ48000_RESAMPLE_FACTOR: f64 = 48_000.0 / (SAMPLE_RATE as f64);
+const HZ88200_RESAMPLE_FACTOR: f64 = 88_200.0 / (SAMPLE_RATE as f64);
+const HZ96000_RESAMPLE_FACTOR: f64 = 96_000.0 / (SAMPLE_RATE as f64);
+
+// Reciprocals allow us to multiply instead of divide during normal interpolation.
+const HZ48000_RESAMPLE_FACTOR_RECIPROCAL: f64 = 1.0 / HZ48000_RESAMPLE_FACTOR;
+const HZ88200_RESAMPLE_FACTOR_RECIPROCAL: f64 = 1.0 / HZ88200_RESAMPLE_FACTOR;
+const HZ96000_RESAMPLE_FACTOR_RECIPROCAL: f64 = 1.0 / HZ96000_RESAMPLE_FACTOR;
 
 // sample rate * channels
 const HZ44100_SAMPLES_PER_SECOND: f64 = 44_100.0 * 2.0;
@@ -23,13 +27,13 @@ const HZ96000_SAMPLES_PER_SECOND: f64 = 96_000.0 * 2.0;
 // to be integers, which is a very good thing. That means no fractional samples
 // which translates to much better interpolation.
 const HZ48000_INTERPOLATION_OUTPUT_SIZE: usize =
-    (RESAMPLER_INPUT_SIZE as f64 * (1.0 / HZ48000_RESAMPLE_FACTOR_RECIPROCAL)) as usize;
+    (RESAMPLER_INPUT_SIZE as f64 * HZ48000_RESAMPLE_FACTOR) as usize;
 
 const HZ88200_INTERPOLATION_OUTPUT_SIZE: usize =
-    (RESAMPLER_INPUT_SIZE as f64 * (1.0 / HZ88200_RESAMPLE_FACTOR_RECIPROCAL)) as usize;
+    (RESAMPLER_INPUT_SIZE as f64 * HZ88200_RESAMPLE_FACTOR) as usize;
 
 const HZ96000_INTERPOLATION_OUTPUT_SIZE: usize =
-    (RESAMPLER_INPUT_SIZE as f64 * (1.0 / HZ96000_RESAMPLE_FACTOR_RECIPROCAL)) as usize;
+    (RESAMPLER_INPUT_SIZE as f64 * HZ96000_RESAMPLE_FACTOR) as usize;
 
 #[derive(Clone, Copy, Debug, Default)]
 pub enum SampleRate {
@@ -134,6 +138,17 @@ impl SampleRate {
         }
     }
 
+    pub fn get_resample_factor(&self) -> Option<f64> {
+        use SampleRate::*;
+
+        match self {
+            Hz44100 => None,
+            Hz48000 => Some(HZ48000_RESAMPLE_FACTOR),
+            Hz88200 => Some(HZ88200_RESAMPLE_FACTOR),
+            Hz96000 => Some(HZ96000_RESAMPLE_FACTOR),
+        }
+    }
+
     pub fn get_resample_factor_reciprocal(&self) -> Option<f64> {
         use SampleRate::*;
 
diff --git a/playback/src/filter_coefficients.rs b/playback/src/filter_coefficients.rs
index dee8a64b..1f89764b 100644
--- a/playback/src/filter_coefficients.rs
+++ b/playback/src/filter_coefficients.rs
@@ -1,1344 +1,1188 @@
-// All Windows calculated with pyfda (Python Filter Design Analysis Tool)
+// All coefficients calculated with pyfda (Python Filter Design Analysis Tool)
 // https://github.com/chipmuenk/pyfda
 // Window = Kaiser
-// beta = 15
-// fc = 22.8kHz
-// -140dB well before 24kHz
-// The assumption is that the input
-// is anti-aliased properly,
-// We just want to make sure interpolation
-// doesn't add any artifacts.
+// Ripple = 0.00017371779276643043
+
+// β = 20.8
+// fc = 20.66
+// -195dB before 22kHz
 #[allow(clippy::excessive_precision)]
-pub const HZ48000_COEFFICIENTS: [f64; 441] = [
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-    -5.444396250307578e-07,
-    3.985058614410556e-07,
-    -2.7026527132156615e-07,
-    1.6104911667095417e-07,
-    -7.114875946245203e-08,
-    -7.7217226107300735e-22,
-    5.362960091161619e-08,
-    -9.145883941617693e-08,
-    1.1552327779416195e-07,
-    -1.280231690229821e-07,
-    1.3119251294318607e-07,
-    -1.271913407105633e-07,
-    1.1802194634247329e-07,
-    -1.0546858823253603e-07,
-    9.105919616127095e-08,
-    -7.604685422793451e-08,
-    6.140828902806317e-08,
-    -4.7856266645529607e-08,
-    3.5862674329115807e-08,
-    -2.5689109092988082e-08,
-    1.7421987235394415e-08,
-    -1.1009494492149948e-08,
-    6.298083919549404e-09,
-    -3.0666660745656922e-09,
-    1.0570942208391173e-09,
-    -8.771146084517915e-23,
+pub const HZ48000_COEFFICIENTS: [f64; 241] = [
+    -2.258118962333164e-11,
+    1.0448101000984154e-10,
+    -2.579276986417335e-10,
+    4.3213325781961056e-10,
+    -4.5843163381727067e-10,
+    2.430239393368342e-11,
+    1.2790201415889041e-09,
+    -3.792077258698514e-09,
+    7.493499387692452e-09,
+    -1.1626845054841438e-08,
+    1.4380896605407448e-08,
+    -1.2833471192711628e-08,
+    3.3983200532147757e-09,
+    1.7048569784995365e-08,
+    -4.9373422503539266e-08,
+    9.003364640559896e-08,
+    -1.2924579989482033e-07,
+    1.5044668040182147e-07,
+    -1.3210217109716104e-07,
+    5.2624736306518187e-08,
+    1.0159667858088225e-07,
+    -3.2622696353370664e-07,
+    5.896182325418432e-07,
+    -8.277448145932576e-07,
+    9.475531903328232e-07,
+    -8.420069483888789e-07,
+    4.1772688158879863e-07,
+    3.676938974884631e-07,
+    -1.4662320604642053e-06,
+    2.70957271705655e-06,
+    -3.802817981364587e-06,
+    4.354432548140361e-06,
+    -3.949196046553083e-06,
+    2.260451641101642e-06,
+    8.156542880169858e-07,
+    -5.034945638176245e-06,
+    9.729638811991692e-06,
+    -1.3824155754916521e-05,
+    1.5973180290174572e-05,
+    -1.4828839170824971e-05,
+    9.409279173382038e-06,
+    4.97915044540138e-07,
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+    4.92301628886413e-05,
+    -4.683190451509506e-05,
+    3.216863473381749e-05,
+    -4.851687701631952e-06,
+    -3.245913549120116e-05,
+    7.378212902653717e-05,
+    -0.00011030659888783692,
+    0.0001317501695922293,
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+    9.409014122219963e-05,
+    -2.7862808366416616e-05,
+    -6.345544705962209e-05,
+    0.00016527387065770158,
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+    0.0002421329206487914,
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+    -9.575731141327346e-05,
+    0.0009835467015551942,
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+    0.0024407594224301493,
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+    0.00010912299971391861,
+    0.0014863005385165546,
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+    0.007044582477270947,
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+    0.0139234284401599,
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+    0.01325702377313349,
+    0.0035612135716636354,
+    -0.025626116624367066,
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+    0.10191100680419664,
+    -0.12175444572282804,
+    0.1346803352883561,
+    0.8608333333333897,
+    0.1346803352883561,
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+    -0.07744152221841791,
+    0.05108081411605677,
+    -0.025626116624367066,
+    0.0035612135716636354,
+    0.01325702377313349,
+    -0.023804280659778104,
+    0.027960344694893176,
+    -0.026443075826064425,
+    0.020623711066876563,
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+    0.0031988445349823255,
+    0.0049126327506936645,
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+    0.0024407594224301493,
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+    0.0009835467015551942,
+    -9.575731141327346e-05,
+    -0.0006659459018028209,
+    0.001183005538332482,
+    -0.0014010675688317755,
+    0.0013298141762067902,
+    -0.0010307540796842497,
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+    -0.00027549921950280733,
+    0.0005598234351094426,
+    -0.0006913872260666551,
+    0.0006738503239522973,
+    -0.000537884656631541,
+    0.0003305257920305843,
+    -0.0001033189088939493,
+    -9.823590003163207e-05,
+    0.0002421329206487914,
+    -0.0003133321268094909,
+    0.00031331992887743433,
+    -0.00025658320129024414,
+    0.00016527387065770158,
+    -6.345544705962209e-05,
+    -2.7862808366416616e-05,
+    9.409014122219963e-05,
+    -0.00012848221714262343,
+    0.0001317501695922293,
+    -0.00011030659888783692,
+    7.378212902653717e-05,
+    -3.245913549120116e-05,
+    -4.851687701631952e-06,
+    3.216863473381749e-05,
+    -4.683190451509506e-05,
+    4.92301628886413e-05,
+    -4.199180492418264e-05,
+    2.8927821383294266e-05,
+    -1.3997250778589253e-05,
+    4.97915044540138e-07,
+    9.409279173382038e-06,
+    -1.4828839170824971e-05,
+    1.5973180290174572e-05,
+    -1.3824155754916521e-05,
+    9.729638811991692e-06,
+    -5.034945638176245e-06,
+    8.156542880169858e-07,
+    2.260451641101642e-06,
+    -3.949196046553083e-06,
+    4.354432548140361e-06,
+    -3.802817981364587e-06,
+    2.70957271705655e-06,
+    -1.4662320604642053e-06,
+    3.676938974884631e-07,
+    4.1772688158879863e-07,
+    -8.420069483888789e-07,
+    9.475531903328232e-07,
+    -8.277448145932576e-07,
+    5.896182325418432e-07,
+    -3.2622696353370664e-07,
+    1.0159667858088225e-07,
+    5.2624736306518187e-08,
+    -1.3210217109716104e-07,
+    1.5044668040182147e-07,
+    -1.2924579989482033e-07,
+    9.003364640559896e-08,
+    -4.9373422503539266e-08,
+    1.7048569784995365e-08,
+    3.3983200532147757e-09,
+    -1.2833471192711628e-08,
+    1.4380896605407448e-08,
+    -1.1626845054841438e-08,
+    7.493499387692452e-09,
+    -3.792077258698514e-09,
+    1.2790201415889041e-09,
+    2.430239393368342e-11,
+    -4.5843163381727067e-10,
+    4.3213325781961056e-10,
+    -2.579276986417335e-10,
+    1.0448101000984154e-10,
+    -2.258118962333164e-11,
 ];
 
+// β = 20.6
+// fc = 20.6
+// -195dB before 22kHz
 #[allow(clippy::excessive_precision)]
 pub const HZ88200_COEFFICIENTS: [f64; 441] = [
-    -3.0915687919410175e-09,
-    -4.380355015683147e-09,
-    7.889301672202866e-09,
-    7.814782506112341e-09,
-    -1.601722660647997e-08,
-    -1.162897576000204e-08,
-    2.875448571604994e-08,
-    1.510435454511938e-08,
-    -4.758343509079679e-08,
-    -1.7052240013897604e-08,
-    7.414020115596361e-08,
-    1.5685867044913693e-08,
-    -1.1013103295646797e-07,
-    -8.486685443549004e-09,
-    1.5720816822680103e-07,
-    -7.927830161980731e-09,
-    -2.1679956837762108e-07,
-    3.792557598966923e-08,
-    2.898880068451338e-07,
-    -8.695906085997518e-08,
-    -3.767366685630587e-07,
-    1.6162916242945288e-07,
-    4.765606699845109e-07,
-    -2.6969832218324916e-07,
-    -5.871467509278004e-07,
-    4.200367275533767e-07,
-    7.044268061921138e-07,
-    -6.224841713408436e-07,
-    -8.220148697645299e-07,
-    8.876100914738924e-07,
-    9.307215563684733e-07,
-    -1.2263549285013004e-06,
-    -1.0180646862659517e-06,
-    1.6495375341784678e-06,
-    1.0677997143447814e-06,
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-    -1.0594984616938665e-06,
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+    -3.818076213800401e-11,
+    3.333531231852631e-11,
+    1.2391850466535611e-11,
 ];
 
+// β = 20.6
+// fc = 20.65
+// -195dB before 22kHz
 #[allow(clippy::excessive_precision)]
-pub const HZ96000_COEFFICIENTS: [f64; 441] = [
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+    -1.4909601103428738e-07,
+    -2.2906722734906596e-07,
+    2.8016936501450825e-08,
+    1.8782810133829837e-07,
+    5.005664742272042e-08,
+    -1.2502708392121218e-07,
+    -8.57196191379699e-08,
+    6.260407964576534e-08,
+    8.856657748781657e-08,
+    -1.377054465796504e-08,
+    -7.159335536018259e-08,
+    -1.6591644718097893e-08,
+    4.6919535092840925e-08,
+    2.9753058833130447e-08,
+    -2.3354970601865938e-08,
+    -3.035967368747228e-08,
+    5.699370544081556e-09,
+    2.395097795739618e-08,
+    4.7187712854981555e-09,
+    -1.526391589543894e-08,
+    -8.879743628810473e-09,
+    7.432242319481839e-09,
+    8.824396176308693e-09,
+    -1.9223082282338022e-09,
+    -6.6709623778697e-09,
+    -1.0805250278628995e-09,
+    4.040333248197303e-09,
+    2.1241568247563375e-09,
+    -1.8677373375643354e-09,
+    -1.9950759509148982e-09,
+    4.841122743309274e-10,
+    1.3876779389493582e-09,
+    1.7447498568802657e-10,
+    -7.560570063834295e-10,
+    -3.4623720597839356e-10,
+    3.0701859865581745e-10,
+    2.809141662660533e-10,
+    -7.018946259546669e-11,
+    -1.5601965248971414e-10,
+    -1.3061824926945334e-11,
+    5.960745176448492e-11,
+    1.915913091651547e-11,
+    -1.1994395146732941e-11,
 ];
diff --git a/playback/src/normaliser.rs b/playback/src/normaliser.rs
index 0807e449..04b7ed32 100644
--- a/playback/src/normaliser.rs
+++ b/playback/src/normaliser.rs
@@ -7,32 +7,6 @@ use crate::{
     ratio_to_db, PCM_AT_0DBFS,
 };
 
-struct NoNormalisation;
-
-impl NoNormalisation {
-    fn normalise(mut samples: Vec<f64>, volume: f64) -> Vec<f64> {
-        if volume < 1.0 {
-            samples.iter_mut().for_each(|sample| *sample *= volume);
-        }
-
-        samples
-    }
-}
-
-struct BasicNormalisation;
-
-impl BasicNormalisation {
-    fn normalise(mut samples: Vec<f64>, volume: f64, factor: f64) -> Vec<f64> {
-        if volume < 1.0 || factor < 1.0 {
-            samples
-                .iter_mut()
-                .for_each(|sample| *sample *= factor * volume);
-        }
-
-        samples
-    }
-}
-
 #[derive(PartialEq)]
 struct DynamicNormalisation {
     threshold_db: f64,
@@ -194,12 +168,35 @@ impl Normalisation {
         }
     }
 
-    fn normalise(&mut self, samples: Vec<f64>, volume: f64, factor: f64) -> Vec<f64> {
+    fn normalise(&mut self, mut samples: Vec<f64>, volume: f64, factor: f64) -> Vec<f64> {
         use Normalisation::*;
 
         match self {
-            None => NoNormalisation::normalise(samples, volume),
-            Basic => BasicNormalisation::normalise(samples, volume, factor),
+            None => {
+                // We only care about volume.
+                // We don't care about factor.
+                // volume: 0.0 - 1.0
+                if volume < 1.0 {
+                    // for each sample: sample = sample * volume
+                    samples.iter_mut().for_each(|sample| *sample *= volume);
+                }
+
+                samples
+            }
+            Basic => {
+                // We care about both volume and factor.
+                // volume: 0.0 - 1.0
+                // factor: 0.0 - 1.0
+                if volume < 1.0 || factor < 1.0 {
+                    // for each sample: sample = sample * volume * factor
+                    samples
+                        .iter_mut()
+                        .for_each(|sample| *sample *= volume * factor);
+                }
+
+                samples
+            }
+            // We don't care about anything, DynamicNormalisation does that for us.
             Dynamic(ref mut d) => d.normalise(samples, volume, factor),
         }
     }
@@ -222,7 +219,7 @@ impl Normaliser {
             normalisation_type: config.normalisation_type,
             pregain_db: config.normalisation_pregain_db,
             threshold_dbfs: config.normalisation_threshold_dbfs,
-            factor: 1.0,
+            factor: 0.0,
         }
     }
 
@@ -233,6 +230,7 @@ impl Normaliser {
     }
 
     pub fn stop(&mut self) {
+        self.factor = 0.0;
         self.normalisation.stop();
     }
 
@@ -241,6 +239,8 @@ impl Normaliser {
         auto_normalise_as_album: bool,
         data: NormalisationData,
     ) {
+        // Normalisation::None doesn't use the factor,
+        // so there is no need to waste the time calculating it.
         if self.normalisation != Normalisation::None {
             self.factor = self.get_factor(auto_normalise_as_album, data);
         }
@@ -326,6 +326,7 @@ impl Normaliser {
         };
 
         debug!("Normalisation Data: {:?}", data);
+        debug!("Normalisation Type: {:?}", self.normalisation_type);
         debug!(
             "Calculated Normalisation Factor for {:?}: {:.2}%",
             norm_type,
diff --git a/playback/src/resampler.rs b/playback/src/resampler.rs
index 7642e44f..17f141c3 100644
--- a/playback/src/resampler.rs
+++ b/playback/src/resampler.rs
@@ -1,76 +1,60 @@
 use std::{
-    collections::{vec_deque, VecDeque},
-    process::exit,
-    sync::atomic::Ordering,
-    sync::mpsc,
-    thread,
+    collections::VecDeque, process::exit, sync::atomic::Ordering::SeqCst, sync::mpsc, thread,
 };
 
-use crate::{
-    config::SampleRate, player::PLAYER_COUNTER, RESAMPLER_INPUT_SIZE,
-    SAMPLE_RATE as SOURCE_SAMPLE_RATE,
-};
-
-struct DelayLine {
-    buffer: VecDeque<f64>,
-    coefficients_length: usize,
-}
-
-impl DelayLine {
-    fn new(coefficients_length: usize) -> DelayLine {
-        Self {
-            buffer: VecDeque::with_capacity(coefficients_length),
-            coefficients_length,
-        }
-    }
-
-    fn push(&mut self, sample: f64) {
-        self.buffer.push_back(sample);
-
-        while self.buffer.len() > self.coefficients_length {
-            self.buffer.pop_front();
-        }
-    }
-
-    fn clear(&mut self) {
-        self.buffer.clear();
-    }
-}
-
-impl<'a> IntoIterator for &'a DelayLine {
-    type Item = &'a f64;
-    type IntoIter = vec_deque::Iter<'a, f64>;
-
-    fn into_iter(self) -> Self::IntoIter {
-        self.buffer.iter()
-    }
-}
+use crate::{config::SampleRate, player::PLAYER_COUNTER, RESAMPLER_INPUT_SIZE};
 
 struct ConvolutionFilter {
     coefficients: Vec<f64>,
-    delay_line: DelayLine,
+    coefficients_length: usize,
+    delay_line: VecDeque<f64>,
 }
 
 impl ConvolutionFilter {
     fn new(coefficients: Vec<f64>) -> Self {
-        let delay_line = DelayLine::new(coefficients.len());
+        let coefficients_length = coefficients.len();
+        let delay_line = VecDeque::with_capacity(coefficients_length);
 
         Self {
             coefficients,
+            coefficients_length,
             delay_line,
         }
     }
 
-    fn convolute(&mut self, sample: f64) -> f64 {
-        self.delay_line.push(sample);
-
-        // Temporal convolution
-        self.coefficients
+    fn get_convoluted_sample(&mut self) -> f64 {
+        let output_sample = self
+            .coefficients
             .iter()
             .zip(&self.delay_line)
             .fold(0.0, |acc, (coefficient, delay_line_sample)| {
                 acc + coefficient * delay_line_sample
-            })
+            });
+
+        self.delay_line.pop_front();
+
+        output_sample
+    }
+
+    fn convolute(&mut self, sample: f64) -> f64 {
+        self.delay_line.push_back(sample);
+
+        if self.delay_line.len() == self.coefficients_length {
+            self.get_convoluted_sample()
+        } else {
+            0.0
+        }
+    }
+
+    fn drain(&mut self) -> Vec<f64> {
+        let delay_line_len = self.delay_line.len();
+        let mut output = Vec::with_capacity(delay_line_len);
+
+        for _ in 0..delay_line_len {
+            output.push(self.get_convoluted_sample());
+        }
+
+        output
     }
 
     fn clear(&mut self) {
@@ -81,6 +65,7 @@ impl ConvolutionFilter {
 struct MonoSincResampler {
     interpolator: ConvolutionFilter,
     input_buffer: Vec<f64>,
+    resample_factor: f64,
     resample_factor_reciprocal: f64,
     delay_line_latency: u64,
     interpolation_output_size: usize,
@@ -92,6 +77,8 @@ impl MonoSincResampler {
             .get_interpolation_coefficients()
             .unwrap_or_default();
 
+        let resample_factor = sample_rate.get_resample_factor().unwrap_or_default();
+
         let resample_factor_reciprocal = sample_rate
             .get_resample_factor_reciprocal()
             .unwrap_or_default();
@@ -104,7 +91,8 @@ impl MonoSincResampler {
 
         Self {
             interpolator: ConvolutionFilter::new(coefficients),
-            input_buffer: Vec::with_capacity(SOURCE_SAMPLE_RATE as usize),
+            input_buffer: Vec::with_capacity(RESAMPLER_INPUT_SIZE),
+            resample_factor,
             resample_factor_reciprocal,
             delay_line_latency,
             interpolation_output_size,
@@ -120,40 +108,76 @@ impl MonoSincResampler {
         self.input_buffer.clear();
     }
 
-    fn resample(&mut self, samples: &[f64]) -> Option<Vec<f64>> {
+    fn drain(&mut self) -> (Option<Vec<f64>>, u64) {
+        // On drain the interpolation isn't perfect for a couple reasons:
+        // 1. buffer len * resample_factor more than likely isn't an integer.
+        // 2. As you drain the delay line there are less and less samples to use for interpolation.
+        let output_len = (self.input_buffer.len() as f64 * self.resample_factor) as usize;
+        let mut output = Vec::with_capacity(output_len);
+
+        output.extend((0..output_len).map(|ouput_index| {
+            self.interpolator.convolute(
+                *self
+                    .input_buffer
+                    .get((ouput_index as f64 * self.resample_factor_reciprocal) as usize)
+                    .unwrap_or(&0.0),
+            )
+        }));
+
+        let interpolator_drainage = self.interpolator.drain();
+
+        output.reserve_exact(interpolator_drainage.len());
+
+        output.extend(interpolator_drainage.iter());
+
+        let output_len = output.len() as f64;
+
+        // Do a simple linear fade out of the drainage (about 5ms) to hide/prevent audible artifacts.
+        for (index, sample) in output.iter_mut().enumerate() {
+            let fade_factor = 1.0 - (index as f64) / output_len;
+            *sample *= fade_factor;
+        }
+
+        (Some(output), 0)
+    }
+
+    fn resample(&mut self, samples: &[f64]) -> (Option<Vec<f64>>, u64) {
         self.input_buffer.extend_from_slice(samples);
 
         let num_buffer_chunks = self.input_buffer.len().saturating_div(RESAMPLER_INPUT_SIZE);
 
         if num_buffer_chunks == 0 {
-            return None;
+            return (None, self.get_latency_pcm());
         }
 
         let input_size = num_buffer_chunks * RESAMPLER_INPUT_SIZE;
-        // The size of the output after interpolation.
+
         let output_size = num_buffer_chunks * self.interpolation_output_size;
 
         let mut output = Vec::with_capacity(output_size);
 
         output.extend((0..output_size).map(|ouput_index| {
-            // The factional weights are already calculated and factored
-            // into our interpolation coefficients so all we have to
-            // do is pretend we're doing nearest-neighbor interpolation
-            // and push samples though the Interpolator and what comes
-            // out the other side is Sinc Windowed Interpolated samples.
-            let sample_index = (ouput_index as f64 * self.resample_factor_reciprocal) as usize;
-            let sample = self.input_buffer[sample_index];
-            self.interpolator.convolute(sample)
+            // Since the interpolation coefficients are pre-calculated we can pretend like
+            // we're doing nearest neighbor interpolation and then push the samples though
+            // the interpolator as if it were a simple FIR filter (which it actually also is).
+            // What comes out the other side is anti-aliased windowed sinc interpolated samples.
+            self.interpolator.convolute(
+                *self
+                    .input_buffer
+                    .get((ouput_index as f64 * self.resample_factor_reciprocal) as usize)
+                    .unwrap_or(&0.0),
+            )
         }));
 
         self.input_buffer.drain(..input_size);
 
-        Some(output)
+        (Some(output), self.get_latency_pcm())
     }
 }
 
 enum ResampleTask {
     Stop,
+    Drain,
     Terminate,
     Resample(Vec<f64>),
 }
@@ -165,12 +189,14 @@ struct ResampleWorker {
 }
 
 impl ResampleWorker {
-    fn new(mut resampler: MonoSincResampler, name: String) -> Self {
+    fn new(sample_rate: SampleRate, name: String) -> Self {
         let (task_sender, task_receiver) = mpsc::channel();
         let (result_sender, result_receiver) = mpsc::channel();
 
         let builder = thread::Builder::new().name(name.clone());
 
+        let mut resampler = MonoSincResampler::new(sample_rate);
+
         let handle = match builder.spawn(move || loop {
             match task_receiver.recv() {
                 Err(e) => {
@@ -183,11 +209,11 @@ impl ResampleWorker {
                 }
                 Ok(task) => match task {
                     ResampleTask::Stop => resampler.stop(),
+                    ResampleTask::Drain => {
+                        result_sender.send(resampler.drain()).ok();
+                    }
                     ResampleTask::Resample(samples) => {
-                        let resampled = resampler.resample(&samples);
-                        let latency = resampler.get_latency_pcm();
-
-                        result_sender.send((resampled, latency)).ok();
+                        result_sender.send(resampler.resample(&samples)).ok();
                     }
                     ResampleTask::Terminate => {
                         loop {
@@ -231,6 +257,12 @@ impl ResampleWorker {
             .and_then(|sender| sender.send(ResampleTask::Stop).ok());
     }
 
+    fn drain(&mut self) {
+        self.task_sender
+            .as_mut()
+            .and_then(|sender| sender.send(ResampleTask::Drain).ok());
+    }
+
     fn resample(&mut self, samples: Vec<f64>) {
         self.task_sender
             .as_mut()
@@ -294,16 +326,16 @@ impl StereoInterleavedResampler {
                 debug!("Interpolation Type: Windowed Sinc");
 
                 // The player increments the player id when it gets it...
-                let player_id = PLAYER_COUNTER.load(Ordering::SeqCst).saturating_sub(1);
+                let player_id = PLAYER_COUNTER.load(SeqCst).saturating_sub(1);
 
                 Resampler::Worker {
                     left_resampler: ResampleWorker::new(
-                        MonoSincResampler::new(sample_rate),
-                        format!("resampler:{player_id}:left"),
+                        sample_rate,
+                        format!("resampler:L:{player_id}"),
                     ),
                     right_resampler: ResampleWorker::new(
-                        MonoSincResampler::new(sample_rate),
-                        format!("resampler:{player_id}:right"),
+                        sample_rate,
+                        format!("resampler:R:{player_id}"),
                     ),
                 }
             }
@@ -319,6 +351,26 @@ impl StereoInterleavedResampler {
         self.latency_pcm
     }
 
+    pub fn drain(&mut self) -> Option<Vec<f64>> {
+        match &mut self.resampler {
+            // Bypass is basically a no-op.
+            Resampler::Bypass => None,
+            Resampler::Worker {
+                left_resampler,
+                right_resampler,
+            } => {
+                left_resampler.drain();
+                right_resampler.drain();
+
+                let (resampled, latency_pcm) = Self::get_resampled(left_resampler, right_resampler);
+
+                self.latency_pcm = latency_pcm;
+
+                resampled
+            }
+        }
+    }
+
     pub fn resample(&mut self, input_samples: Vec<f64>) -> Option<Vec<f64>> {
         match &mut self.resampler {
             // Bypass is basically a no-op.
@@ -332,17 +384,11 @@ impl StereoInterleavedResampler {
                 left_resampler.resample(left_samples);
                 right_resampler.resample(right_samples);
 
-                let (left_resampled, left_latency_pcm) = left_resampler.get_resampled();
-                let (right_resampled, right_latency_pcm) = right_resampler.get_resampled();
+                let (resampled, latency_pcm) = Self::get_resampled(left_resampler, right_resampler);
 
-                // They should always be equal
-                self.latency_pcm = left_latency_pcm.max(right_latency_pcm);
+                self.latency_pcm = latency_pcm;
 
-                left_resampled.and_then(|left_samples| {
-                    right_resampled.map(|right_samples| {
-                        Self::interleave_samples(&left_samples, &right_samples)
-                    })
-                })
+                resampled
             }
         }
     }
@@ -364,6 +410,24 @@ impl StereoInterleavedResampler {
         }
     }
 
+    fn get_resampled(
+        left_resampler: &mut ResampleWorker,
+        right_resampler: &mut ResampleWorker,
+    ) -> (Option<Vec<f64>>, u64) {
+        let (left_resampled, left_latency_pcm) = left_resampler.get_resampled();
+        let (right_resampled, right_latency_pcm) = right_resampler.get_resampled();
+
+        let resampled = left_resampled.and_then(|left_samples| {
+            right_resampled
+                .map(|right_samples| Self::interleave_samples(&left_samples, &right_samples))
+        });
+
+        // They should always be equal
+        let latency_pcm = left_latency_pcm.max(right_latency_pcm);
+
+        (resampled, latency_pcm)
+    }
+
     fn interleave_samples(left_samples: &[f64], right_samples: &[f64]) -> Vec<f64> {
         // Re-interleave the resampled channels.
         let mut output = Vec::with_capacity(left_samples.len() + right_samples.len());
diff --git a/playback/src/sample_pipeline.rs b/playback/src/sample_pipeline.rs
index 53bbc29f..b8e438ef 100644
--- a/playback/src/sample_pipeline.rs
+++ b/playback/src/sample_pipeline.rs
@@ -10,15 +10,120 @@ use crate::{
     MS_PER_PAGE,
 };
 
-pub struct SamplePipeline {
+pub enum SamplePipeline {
+    PassThrough(Bypass),
+    Process(Pipeline),
+}
+
+impl SamplePipeline {
+    pub fn new(
+        config: &PlayerConfig,
+        sink: Box<dyn Sink>,
+        volume_getter: Box<dyn VolumeGetter>,
+    ) -> Self {
+        if config.passthrough {
+            SamplePipeline::PassThrough(Bypass::new(config, sink))
+        } else {
+            SamplePipeline::Process(Pipeline::new(config, sink, volume_getter))
+        }
+    }
+
+    pub fn get_latency_ms(&mut self) -> u32 {
+        use SamplePipeline::*;
+
+        match self {
+            PassThrough(_) => 0,
+            Process(ref mut p) => p.get_latency_ms(),
+        }
+    }
+
+    pub fn start(&mut self) -> SinkResult<()> {
+        use SamplePipeline::*;
+
+        match self {
+            PassThrough(ref mut p) => p.start()?,
+            Process(ref mut p) => p.start()?,
+        }
+
+        Ok(())
+    }
+
+    pub fn stop(&mut self) -> SinkResult<()> {
+        use SamplePipeline::*;
+
+        match self {
+            PassThrough(ref mut p) => p.stop()?,
+            Process(ref mut p) => p.stop()?,
+        }
+
+        Ok(())
+    }
+
+    pub fn update_normalisation_data(
+        &mut self,
+        auto_normalise_as_album: bool,
+        data: NormalisationData,
+    ) {
+        use SamplePipeline::*;
+
+        match self {
+            PassThrough(_) => (),
+            Process(ref mut p) => p.update_normalisation_data(auto_normalise_as_album, data),
+        }
+    }
+
+    pub fn write(&mut self, packet: AudioPacket) -> SinkResult<()> {
+        use SamplePipeline::*;
+
+        match self {
+            PassThrough(ref mut p) => p.write(packet)?,
+            Process(ref mut p) => p.write(packet)?,
+        }
+
+        Ok(())
+    }
+}
+
+pub struct Bypass {
+    converter: Converter,
+    sink: Box<dyn Sink>,
+}
+
+impl Bypass {
+    fn new(config: &PlayerConfig, sink: Box<dyn Sink>) -> Self {
+        let converter = Converter::new(config.ditherer);
+
+        Self { converter, sink }
+    }
+
+    fn start(&mut self) -> SinkResult<()> {
+        self.sink.start()?;
+
+        Ok(())
+    }
+
+    fn stop(&mut self) -> SinkResult<()> {
+        self.sink.stop()?;
+
+        Ok(())
+    }
+
+    fn write(&mut self, packet: AudioPacket) -> SinkResult<()> {
+        self.sink.write(packet, &mut self.converter)?;
+
+        Ok(())
+    }
+}
+
+pub struct Pipeline {
     resampler: StereoInterleavedResampler,
     normaliser: Normaliser,
     converter: Converter,
     sink: Box<dyn Sink>,
 }
 
-impl SamplePipeline {
-    pub fn new(
+impl Pipeline {
+    fn new(
         config: &PlayerConfig,
         sink: Box<dyn Sink>,
         volume_getter: Box<dyn VolumeGetter>,
@@ -36,27 +141,34 @@ impl SamplePipeline {
         }
     }
 
-    pub fn get_latency_ms(&mut self) -> u32 {
+    fn get_latency_ms(&mut self) -> u32 {
         let total_latency_pcm = self.sink.get_latency_pcm() + self.resampler.get_latency_pcm();
 
         (total_latency_pcm as f64 * MS_PER_PAGE) as u32
     }
 
-    pub fn start(&mut self) -> SinkResult<()> {
+    fn start(&mut self) -> SinkResult<()> {
         self.sink.start()?;
 
         Ok(())
     }
 
-    pub fn stop(&mut self) -> SinkResult<()> {
+    fn stop(&mut self) -> SinkResult<()> {
+        self.resampler
+            .drain()
+            .map(|processed_samples| self.normaliser.normalise(processed_samples))
+            .map(|new_packet| self.sink.write(new_packet, &mut self.converter))
+            .transpose()?;
+
         self.resampler.stop();
         self.normaliser.stop();
+
         self.sink.stop()?;
 
         Ok(())
     }
 
-    pub fn update_normalisation_data(
+    fn update_normalisation_data(
         &mut self,
         auto_normalise_as_album: bool,
         data: NormalisationData,
@@ -65,15 +177,13 @@ impl SamplePipeline {
             .update_normalisation_data(auto_normalise_as_album, data);
     }
 
-    pub fn write(&mut self, packet: AudioPacket) -> SinkResult<()> {
+    fn write(&mut self, packet: AudioPacket) -> SinkResult<()> {
         if let AudioPacket::Samples(samples) = packet {
             self.resampler
                 .resample(samples)
                 .map(|processed_samples| self.normaliser.normalise(processed_samples))
                 .map(|new_packet| self.sink.write(new_packet, &mut self.converter))
                 .transpose()?;
-        } else {
-            self.sink.write(packet, &mut self.converter)?;
         }
 
         Ok(())