New filter coeff's and only have one quality setting.

playback/src/config.rs

@@ -4,9 +4,7 @@ pub use crate::dither::{mk_ditherer, DithererBuilder, TriangularDitherer};
 
 use crate::{
     convert::i24,
-    filter_coefficients::{
+    filter_coefficients::{HZ48000_COEFFICIENTS, HZ88200_COEFFICIENTS, HZ96000_COEFFICIENTS},
-        HZ48000_HIGH, HZ48000_LOW, HZ88200_HIGH, HZ88200_LOW, HZ96000_HIGH, HZ96000_LOW,
-    },
     RESAMPLER_INPUT_SIZE, SAMPLE_RATE,
 };
 
@@ -33,69 +31,6 @@ const HZ88200_INTERPOLATION_OUTPUT_SIZE: usize =
 const HZ96000_INTERPOLATION_OUTPUT_SIZE: usize =
     (RESAMPLER_INPUT_SIZE as f64 * (1.0 / HZ96000_RESAMPLE_FACTOR_RECIPROCAL)) as usize;
 
-#[derive(Clone, Copy, Debug, Default)]
-pub enum InterpolationQuality {
-    Low,
-    #[default]
-    High,
-}
-
-impl FromStr for InterpolationQuality {
-    type Err = ();
-
-    fn from_str(s: &str) -> Result<Self, Self::Err> {
-        use InterpolationQuality::*;
-
-        match s.to_lowercase().as_ref() {
-            "low" => Ok(Low),
-            "high" => Ok(High),
-            _ => Err(()),
-        }
-    }
-}
-
-impl std::fmt::Display for InterpolationQuality {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        use InterpolationQuality::*;
-
-        match self {
-            Low => write!(f, "Low"),
-            High => write!(f, "High"),
-        }
-    }
-}
-
-impl InterpolationQuality {
-    pub fn get_interpolation_coefficients(
-        &self,
-        mut coefficients: Vec<f64>,
-        resample_factor_reciprocal: f64,
-    ) -> Vec<f64> {
-        let mut coefficient_sum = 0.0;
-
-        for (index, coefficient) in coefficients.iter_mut().enumerate() {
-            *coefficient *= Self::sinc((index as f64 * resample_factor_reciprocal).fract());
-
-            coefficient_sum += *coefficient;
-        }
-
-        coefficients
-            .iter_mut()
-            .for_each(|coefficient| *coefficient /= coefficient_sum);
-
-        coefficients
-    }
-
-    fn sinc(x: f64) -> f64 {
-        if x.abs() < f64::EPSILON {
-            1.0
-        } else {
-            let pi_x = std::f64::consts::PI * x;
-            pi_x.sin() / pi_x
-        }
-    }
-}
-
 #[derive(Clone, Copy, Debug, Default)]
 pub enum SampleRate {
     #[default]
@@ -152,14 +87,6 @@ impl std::fmt::Display for SampleRate {
     }
 }
 
-#[derive(Debug, Default)]
-pub struct ResampleSpec {
-    pub resample_factor_reciprocal: f64,
-    pub interpolation_output_size: usize,
-    pub high_coefficients: Vec<f64>,
-    pub low_coefficients: Vec<f64>,
-}
-
 impl SampleRate {
     pub fn as_u32(&self) -> u32 {
         use SampleRate::*;
@@ -207,41 +134,73 @@ impl SampleRate {
         }
     }
 
-    pub fn get_resample_spec(&self) -> ResampleSpec {
+    pub fn get_resample_factor_reciprocal(&self) -> Option<f64> {
         use SampleRate::*;
 
         match self {
-            // Dummy values to satisfy
+            Hz44100 => None,
-            // the match statement.
+            Hz48000 => Some(HZ48000_RESAMPLE_FACTOR_RECIPROCAL),
-            // 44.1kHz will be bypassed.
+            Hz88200 => Some(HZ88200_RESAMPLE_FACTOR_RECIPROCAL),
-            Hz44100 => {
+            Hz96000 => Some(HZ96000_RESAMPLE_FACTOR_RECIPROCAL),
-                warn!("Resampling 44.1kHz to 44.1kHz is just a really CPU intensive no-op, you should not be doing it");
+        }
+    }
 
-                ResampleSpec {
+    pub fn get_interpolation_output_size(&self) -> Option<usize> {
-                    resample_factor_reciprocal: 1.0,
+        use SampleRate::*;
-                    interpolation_output_size: RESAMPLER_INPUT_SIZE,
+
-                    high_coefficients: vec![],
+        match self {
-                    low_coefficients: vec![],
+            Hz44100 => None,
-                }
+            Hz48000 => Some(HZ48000_INTERPOLATION_OUTPUT_SIZE),
-            }
+            Hz88200 => Some(HZ88200_INTERPOLATION_OUTPUT_SIZE),
-            Hz48000 => ResampleSpec {
+            Hz96000 => Some(HZ96000_INTERPOLATION_OUTPUT_SIZE),
-                resample_factor_reciprocal: HZ48000_RESAMPLE_FACTOR_RECIPROCAL,
+        }
-                interpolation_output_size: HZ48000_INTERPOLATION_OUTPUT_SIZE,
+    }
-                high_coefficients: HZ48000_HIGH.to_vec(),
+
-                low_coefficients: HZ48000_LOW.to_vec(),
+    pub fn get_interpolation_coefficients(&self) -> Option<Vec<f64>> {
-            },
+        use SampleRate::*;
-            Hz88200 => ResampleSpec {
+
-                resample_factor_reciprocal: HZ88200_RESAMPLE_FACTOR_RECIPROCAL,
+        match self {
-                interpolation_output_size: HZ88200_INTERPOLATION_OUTPUT_SIZE,
+            Hz44100 => None,
-                high_coefficients: HZ88200_HIGH.to_vec(),
+            Hz48000 => Some(Self::calculate_interpolation_coefficients(
-                low_coefficients: HZ88200_LOW.to_vec(),
+                HZ48000_COEFFICIENTS.to_vec(),
-            },
+                HZ48000_RESAMPLE_FACTOR_RECIPROCAL,
-            Hz96000 => ResampleSpec {
+            )),
-                resample_factor_reciprocal: HZ96000_RESAMPLE_FACTOR_RECIPROCAL,
+            Hz88200 => Some(Self::calculate_interpolation_coefficients(
-                interpolation_output_size: HZ96000_INTERPOLATION_OUTPUT_SIZE,
+                HZ88200_COEFFICIENTS.to_vec(),
-                high_coefficients: HZ96000_HIGH.to_vec(),
+                HZ88200_RESAMPLE_FACTOR_RECIPROCAL,
-                low_coefficients: HZ96000_LOW.to_vec(),
+            )),
-            },
+            Hz96000 => Some(Self::calculate_interpolation_coefficients(
+                HZ96000_COEFFICIENTS.to_vec(),
+                HZ96000_RESAMPLE_FACTOR_RECIPROCAL,
+            )),
+        }
+    }
+
+    fn calculate_interpolation_coefficients(
+        mut coefficients: Vec<f64>,
+        resample_factor_reciprocal: f64,
+    ) -> Vec<f64> {
+        let mut coefficient_sum = 0.0;
+
+        for (index, coefficient) in coefficients.iter_mut().enumerate() {
+            *coefficient *= Self::sinc((index as f64 * resample_factor_reciprocal).fract());
+
+            coefficient_sum += *coefficient;
+        }
+
+        coefficients
+            .iter_mut()
+            .for_each(|coefficient| *coefficient /= coefficient_sum);
+
+        coefficients
+    }
+
+    fn sinc(x: f64) -> f64 {
+        if x.abs() < f64::EPSILON {
+            1.0
+        } else {
+            let pi_x = std::f64::consts::PI * x;
+            pi_x.sin() / pi_x
         }
     }
 }
@@ -361,7 +320,6 @@ pub struct PlayerConfig {
     pub gapless: bool,
     pub passthrough: bool,
 
-    pub interpolation_quality: InterpolationQuality,
     pub sample_rate: SampleRate,
 
     pub normalisation: bool,
@@ -384,7 +342,6 @@ impl Default for PlayerConfig {
             bitrate: Bitrate::default(),
             gapless: true,
             normalisation: false,
-            interpolation_quality: InterpolationQuality::default(),
             sample_rate: SampleRate::default(),
             normalisation_type: NormalisationType::default(),
             normalisation_method: NormalisationMethod::default(),

playback/src/resampler.rs

@@ -7,9 +7,8 @@ use std::{
 };
 
 use crate::{
-    config::{InterpolationQuality, SampleRate},
+    config::SampleRate, player::PLAYER_COUNTER, RESAMPLER_INPUT_SIZE,
-    player::PLAYER_COUNTER,
+    SAMPLE_RATE as SOURCE_SAMPLE_RATE,
-    RESAMPLER_INPUT_SIZE, SAMPLE_RATE as SOURCE_SAMPLE_RATE,
 };
 
 struct DelayLine {
@@ -88,27 +87,27 @@ struct MonoSincResampler {
 }
 
 impl MonoSincResampler {
-    fn new(sample_rate: SampleRate, interpolation_quality: InterpolationQuality) -> Self {
+    fn new(sample_rate: SampleRate) -> Self {
-        let spec = sample_rate.get_resample_spec();
+        let coefficients = sample_rate
+            .get_interpolation_coefficients()
+            .unwrap_or_default();
 
-        let coefficients = match interpolation_quality {
+        let resample_factor_reciprocal = sample_rate
-            InterpolationQuality::Low => spec.low_coefficients,
+            .get_resample_factor_reciprocal()
-            InterpolationQuality::High => spec.high_coefficients,
+            .unwrap_or_default();
-        };
 
-        let delay_line_latency =
+        let interpolation_output_size = sample_rate
-            (coefficients.len() as f64 * spec.resample_factor_reciprocal) as u64;
+            .get_interpolation_output_size()
+            .unwrap_or_default();
+
+        let delay_line_latency = (coefficients.len() as f64 * resample_factor_reciprocal) as u64;
 
         Self {
-            interpolator: ConvolutionFilter::new(
+            interpolator: ConvolutionFilter::new(coefficients),
-                interpolation_quality
-                    .get_interpolation_coefficients(coefficients, spec.resample_factor_reciprocal),
-            ),
-
             input_buffer: Vec::with_capacity(SOURCE_SAMPLE_RATE as usize),
-            resample_factor_reciprocal: spec.resample_factor_reciprocal,
+            resample_factor_reciprocal,
             delay_line_latency,
-            interpolation_output_size: spec.interpolation_output_size,
+            interpolation_output_size,
         }
     }
 
@@ -281,7 +280,7 @@ pub struct StereoInterleavedResampler {
 }
 
 impl StereoInterleavedResampler {
-    pub fn new(sample_rate: SampleRate, interpolation_quality: InterpolationQuality) -> Self {
+    pub fn new(sample_rate: SampleRate) -> Self {
         debug!("Sample Rate: {sample_rate}");
 
         let resampler = match sample_rate {
@@ -292,7 +291,7 @@ impl StereoInterleavedResampler {
                 Resampler::Bypass
             }
             _ => {
-                debug!("Interpolation Quality: {interpolation_quality}");
+                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);
@@ -300,12 +299,15 @@ impl StereoInterleavedResampler {
                 let left_thread_name = format!("resampler:{player_id}:left");
                 let right_thread_name = format!("resampler:{player_id}:right");
 
-                let left = MonoSincResampler::new(sample_rate, interpolation_quality);
-                let right = MonoSincResampler::new(sample_rate, interpolation_quality);
-
                 Resampler::Worker {
-                    left_resampler: ResampleWorker::new(left, left_thread_name),
+                    left_resampler: ResampleWorker::new(
-                    right_resampler: ResampleWorker::new(right, right_thread_name),
+                        MonoSincResampler::new(sample_rate),
+                        left_thread_name,
+                    ),
+                    right_resampler: ResampleWorker::new(
+                        MonoSincResampler::new(sample_rate),
+                        right_thread_name,
+                    ),
                 }
             }
         };

playback/src/sample_pipeline.rs

@@ -23,8 +23,7 @@ impl SamplePipeline {
         sink: Box<dyn Sink>,
         volume_getter: Box<dyn VolumeGetter>,
     ) -> Self {
-        let resampler =
+        let resampler = StereoInterleavedResampler::new(config.sample_rate);
-            StereoInterleavedResampler::new(config.sample_rate, config.interpolation_quality);
 
         let normaliser = Normaliser::new(config, volume_getter);
         let converter = Converter::new(config.ditherer);

src/main.rs

@@ -24,8 +24,8 @@ use librespot::{
     playback::{
         audio_backend::{self, SinkBuilder, BACKENDS},
         config::{
-            AudioFormat, Bitrate, InterpolationQuality, NormalisationMethod, NormalisationType,
+            AudioFormat, Bitrate, NormalisationMethod, NormalisationType, PlayerConfig, SampleRate,
-            PlayerConfig, SampleRate, VolumeCtrl,
+            VolumeCtrl,
         },
         dither,
         mixer::{self, MixerConfig, MixerFn},
@@ -240,7 +240,6 @@ fn get_setup() -> Setup {
     const VOLUME_RANGE: &str = "volume-range";
     const ZEROCONF_PORT: &str = "zeroconf-port";
     const ZEROCONF_INTERFACE: &str = "zeroconf-interface";
-    const INTERPOLATION_QUALITY: &str = "interpolation-quality";
     const SAMPLE_RATE: &str = "sample-rate";
 
     // Mostly arbitrary.
@@ -579,11 +578,6 @@ fn get_setup() -> Setup {
         ZEROCONF_INTERFACE,
         "Comma-separated interface IP addresses on which zeroconf will bind. Defaults to all interfaces. Ignored by DNS-SD.",
         "IP"
-    ).optopt(
-        "",
-        INTERPOLATION_QUALITY,
-        "Interpolation Quality to use if Resampling {Low|High}. Defaults to High.",
-        "QUALITY"
     ).optopt(
         "",
         SAMPLE_RATE,
@@ -800,32 +794,6 @@ fn get_setup() -> Setup {
         })
         .unwrap_or_default();
 
-    let interpolation_quality = opt_str(INTERPOLATION_QUALITY)
-        .as_deref()
-        .map(|interpolation_quality| match sample_rate {
-            SampleRate::Hz44100 => {
-                warn!(
-                    "--{} has no effect with a sample rate of {sample_rate}.",
-                    INTERPOLATION_QUALITY
-                );
-
-                InterpolationQuality::default()
-            }
-            _ => InterpolationQuality::from_str(interpolation_quality).unwrap_or_else(|_| {
-                let default_value = &format!("{}", InterpolationQuality::default());
-                invalid_error_msg(
-                    INTERPOLATION_QUALITY,
-                    "",
-                    interpolation_quality,
-                    "Low, High",
-                    default_value,
-                );
-
-                exit(1);
-            }),
-        })
-        .unwrap_or_default();
-
     let format = opt_str(FORMAT)
         .as_deref()
         .map(|format| {
@@ -1671,7 +1639,6 @@ fn get_setup() -> Setup {
             bitrate,
             gapless,
             passthrough,
-            interpolation_quality,
             sample_rate,
             normalisation,
             normalisation_type,