2022-02-13 03:27:23 +11:00
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// Diopser: a phase rotation plugin
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// Copyright (C) 2021-2022 Robbert van der Helm
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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2022-03-02 06:59:31 +11:00
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#![cfg_attr(feature = "simd", feature(portable_simd))]
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2022-03-04 22:49:36 +11:00
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#[cfg(not(feature = "simd"))]
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compile_error!("Compiling without SIMD support is currently not supported");
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2022-03-04 22:21:29 +11:00
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#[macro_use]
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extern crate nih_plug;
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2022-03-04 09:23:51 +11:00
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use nih_plug::prelude::*;
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2022-03-15 23:53:31 +11:00
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use nih_plug_egui::EguiState;
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use std::pin::Pin;
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use std::simd::f32x2;
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use std::sync::atomic::{AtomicBool, Ordering};
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use std::sync::Arc;
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2022-02-13 02:27:57 +11:00
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2022-03-07 23:57:24 +11:00
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use crate::spectrum::{SpectrumInput, SpectrumOutput};
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2022-03-06 05:39:52 +11:00
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mod editor;
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2022-02-13 04:07:40 +11:00
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mod filter;
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2022-03-07 23:57:24 +11:00
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mod spectrum;
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2022-02-13 04:07:40 +11:00
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2022-02-13 07:12:08 +11:00
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/// How many all-pass filters we can have in series at most. The filter stages parameter determines
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/// how many filters are actually active.
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const MAX_NUM_FILTERS: usize = 512;
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/// The minimum step size for smoothing the filter parmaeters.
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2022-02-14 05:49:18 +11:00
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const MIN_AUTOMATION_STEP_SIZE: u32 = 1;
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/// The maximum step size for smoothing the filter parameters. Updating these parameters can be
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/// expensive, so updating them in larger steps can be useful.
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const MAX_AUTOMATION_STEP_SIZE: u32 = 512;
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2022-02-15 09:59:40 +11:00
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// All features from the original Diopser have been implemented (and the spread control has been
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// improved). Other features I want to implement are:
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2022-02-14 06:21:59 +11:00
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// - Briefly muting the output when changing the number of filters to get rid of the clicks
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2022-03-06 05:39:52 +11:00
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// - A proper GUI
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struct Diopser {
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params: Pin<Arc<DiopserParams>>,
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editor_state: Arc<EguiState>,
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/// Needed for computing the filter coefficients.
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sample_rate: f32,
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2022-02-16 04:04:26 +11:00
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/// All of the all-pass filters, with vectorized coefficients so they can be calculated for
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2022-03-04 09:05:01 +11:00
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/// multiple channels at once. [`DiopserParams::num_stages`] controls how many filters are
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2022-02-16 04:04:26 +11:00
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/// actually active.
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filters: [filter::Biquad<f32x2>; MAX_NUM_FILTERS],
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/// If this is set at the start of the processing cycle, then the filter coefficients should be
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/// updated. For the regular filter parameters we can look at the smoothers, but this is needed
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/// when changing the number of active filters.
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should_update_filters: Arc<AtomicBool>,
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/// If this is 1 and any of the filter parameters are still smoothing, thenn the filter
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/// coefficients should be recalculated on the next sample. After that, this gets reset to
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/// `unnormalize_automation_precision(self.params.automation_precision.value)`. This is to
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/// reduce the DSP load of automation parameters. It can also cause some fun sounding glitchy
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/// effects when the precision is low.
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next_filter_smoothing_in: i32,
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/// When the GUI is open we compute the spectrum on the audio thread and send it to the GUI.
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spectrum_input: SpectrumInput,
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/// This can be cloned and moved into the editor.
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spectrum_output: Arc<SpectrumOutput>,
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}
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2022-02-13 07:12:08 +11:00
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// TODO: Some combinations of parameters can cause really loud resonance. We should limit the
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// resonance and filter stages parameter ranges in the GUI until the user unlocks.
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#[derive(Params)]
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pub struct DiopserParams {
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/// The number of all-pass filters applied in series.
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#[id = "stages"]
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filter_stages: IntParam,
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/// The filter's center frequqency. When this is applied, the filters are spread around this
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/// frequency.
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/// FIXME: Entering -3 or another invalid value will set the parameter to NaN
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#[id = "cutoff"]
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filter_frequency: FloatParam,
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/// The Q parameter for the filters.
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#[id = "res"]
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filter_resonance: FloatParam,
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/// Controls a frequency spread between the filter stages in octaves. When this value is 0, the
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/// same coefficients are used for every filter. Otherwise, the earliest stage's frequency will
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/// be offset by `-filter_spread_octave_amount`, while the latest stage will be offset by
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/// `filter_spread_octave_amount`. If the filter spread style is set to linear then the negative
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/// range will cover the same frequency range as the positive range.
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#[id = "spread"]
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filter_spread_octaves: FloatParam,
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/// How the spread range should be distributed. The octaves mode will sound more musical while
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/// the linear mode can be useful for sound design purposes.
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#[id = "spstyl"]
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filter_spread_style: EnumParam<SpreadStyle>,
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/// The precision of the automation, determines the step size. This is presented to the userq as
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/// a percentage, and it's stored here as `[0, 1]` float because smaller step sizes are more
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/// precise so having this be an integer would result in odd situations.
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#[id = "autopr"]
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automation_precision: FloatParam,
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/// Very important.
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#[id = "ignore"]
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very_important: BoolParam,
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}
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impl Default for Diopser {
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fn default() -> Self {
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let should_update_filters = Arc::new(AtomicBool::new(false));
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2022-03-07 23:57:24 +11:00
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// We only do stereo right now so this is simple
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let (spectrum_input, spectrum_output) =
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SpectrumInput::new(Self::DEFAULT_NUM_OUTPUTS as usize);
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Self {
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params: Arc::pin(DiopserParams::new(should_update_filters.clone())),
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editor_state: editor::default_state(),
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sample_rate: 1.0,
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2022-02-16 04:04:26 +11:00
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filters: [filter::Biquad::default(); MAX_NUM_FILTERS],
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should_update_filters,
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next_filter_smoothing_in: 1,
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spectrum_input,
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spectrum_output: Arc::new(spectrum_output),
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}
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}
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}
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impl DiopserParams {
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fn new(should_update_filters: Arc<AtomicBool>) -> Self {
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Self {
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filter_stages: IntParam::new(
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"Filter Stages",
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0,
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IntRange::Linear {
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min: 0,
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max: MAX_NUM_FILTERS as i32,
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},
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)
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.with_callback({
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let should_update_filters = should_update_filters.clone();
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Arc::new(move |_| should_update_filters.store(true, Ordering::Release))
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}),
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2022-02-13 07:53:19 +11:00
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// Smoothed parameters don't need the callback as we can just look at whether the
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// smoother is still smoothing
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filter_frequency: FloatParam::new(
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"Filter Frequency",
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200.0,
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FloatRange::Skewed {
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min: 5.0, // This must never reach 0
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max: 20_000.0,
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factor: FloatRange::skew_factor(-2.5),
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},
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)
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// This needs quite a bit of smoothing to avoid artifacts
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.with_smoother(SmoothingStyle::Logarithmic(100.0))
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.with_unit(" Hz")
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.with_value_to_string(formatters::f32_rounded(0)),
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filter_resonance: FloatParam::new(
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"Filter Resonance",
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// The actual default neutral Q-value would be `sqrt(2) / 2`, but this value
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// produces slightly less ringing.
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0.5,
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FloatRange::Skewed {
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min: 0.01, // This must also never reach 0
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max: 30.0,
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factor: FloatRange::skew_factor(-2.5),
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},
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)
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.with_smoother(SmoothingStyle::Logarithmic(100.0))
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.with_value_to_string(formatters::f32_rounded(2)),
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filter_spread_octaves: FloatParam::new(
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"Filter Spread Octaves",
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0.0,
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FloatRange::SymmetricalSkewed {
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min: -5.0,
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max: 5.0,
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factor: FloatRange::skew_factor(-1.0),
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center: 0.0,
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},
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)
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.with_step_size(0.01)
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.with_smoother(SmoothingStyle::Linear(100.0)),
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filter_spread_style: EnumParam::new("Filter Spread Style", SpreadStyle::Octaves)
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.with_callback(Arc::new(move |_| {
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should_update_filters.store(true, Ordering::Release)
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})),
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very_important: BoolParam::new("Don't touch this", true).with_value_to_string(
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Arc::new(|value| String::from(if value { "please don't" } else { "stop it" })),
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),
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automation_precision: FloatParam::new(
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"Automation precision",
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normalize_automation_precision(128),
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FloatRange::Linear { min: 0.0, max: 1.0 },
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)
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.with_unit("%")
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.with_value_to_string(formatters::f32_percentage(0))
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.with_string_to_value(formatters::from_f32_percentage()),
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}
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}
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}
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2022-03-06 05:50:12 +11:00
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#[derive(Enum, Debug, PartialEq)]
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enum SpreadStyle {
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Octaves,
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Linear,
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}
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impl Plugin for Diopser {
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const NAME: &'static str = "Diopser";
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const VENDOR: &'static str = "Robbert van der Helm";
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const URL: &'static str = "https://github.com/robbert-vdh/nih-plug";
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const EMAIL: &'static str = "mail@robbertvanderhelm.nl";
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const VERSION: &'static str = "0.2.0";
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const DEFAULT_NUM_INPUTS: u32 = 2;
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const DEFAULT_NUM_OUTPUTS: u32 = 2;
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2022-03-11 06:32:36 +11:00
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const SAMPLE_ACCURATE_AUTOMATION: bool = true;
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fn params(&self) -> Pin<&dyn Params> {
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self.params.as_ref()
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}
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fn editor(&self) -> Option<Box<dyn Editor>> {
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editor::create(self.params.clone(), self.editor_state.clone())
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}
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fn accepts_bus_config(&self, config: &BusConfig) -> bool {
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// The SIMD version only supports stereo
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config.num_input_channels == config.num_output_channels && config.num_input_channels == 2
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}
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fn initialize(
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&mut self,
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_bus_config: &BusConfig,
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buffer_config: &BufferConfig,
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_context: &mut impl ProcessContext,
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) -> bool {
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self.sample_rate = buffer_config.sample_rate;
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true
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}
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2022-03-08 10:42:58 +11:00
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fn reset(&mut self) {
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// Initialize and/or reset the filters on the next process call
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self.should_update_filters.store(true, Ordering::Release);
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}
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fn process(
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&mut self,
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buffer: &mut Buffer,
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_context: &mut impl ProcessContext,
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) -> ProcessStatus {
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2022-02-14 05:49:18 +11:00
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// Since this is an expensive operation, only update the filters when it's actually
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// necessary, and allow smoothing only every n samples using the automation precision
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// parameter
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let smoothing_interval =
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unnormalize_automation_precision(self.params.automation_precision.value);
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|
|
|
2022-03-10 06:11:37 +11:00
|
|
|
for mut channel_samples in buffer.iter_samples() {
|
2022-02-14 05:49:18 +11:00
|
|
|
self.maybe_update_filters(smoothing_interval);
|
2022-02-13 07:12:08 +11:00
|
|
|
|
2022-02-16 04:30:45 +11:00
|
|
|
// We can compute the filters for both channels at once. The SIMD version thus now only
|
|
|
|
// supports steroo audio.
|
2022-03-04 22:49:36 +11:00
|
|
|
let mut samples = unsafe { channel_samples.to_simd_unchecked() };
|
2022-02-16 04:30:45 +11:00
|
|
|
|
2022-03-04 22:49:36 +11:00
|
|
|
for filter in self
|
|
|
|
.filters
|
|
|
|
.iter_mut()
|
|
|
|
.take(self.params.filter_stages.value as usize)
|
|
|
|
{
|
|
|
|
samples = filter.process(samples);
|
2022-02-13 07:12:08 +11:00
|
|
|
}
|
2022-02-16 04:04:26 +11:00
|
|
|
|
2022-03-04 22:49:36 +11:00
|
|
|
unsafe { channel_samples.from_simd_unchecked(samples) };
|
2022-02-13 07:12:08 +11:00
|
|
|
}
|
|
|
|
|
2022-03-07 23:57:24 +11:00
|
|
|
// Compute a spectrum for the GUI if needed
|
|
|
|
if self.editor_state.is_open() {
|
|
|
|
self.spectrum_input.compute(buffer);
|
|
|
|
}
|
|
|
|
|
2022-02-13 02:27:57 +11:00
|
|
|
ProcessStatus::Normal
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2022-02-13 07:12:08 +11:00
|
|
|
impl Diopser {
|
2022-03-04 09:05:01 +11:00
|
|
|
/// Check if the filters need to be updated beased on
|
|
|
|
/// [`should_update_filters`][Self::should_update_filters] and the smoothing interval, and
|
|
|
|
/// update them as needed.
|
2022-02-14 05:49:18 +11:00
|
|
|
fn maybe_update_filters(&mut self, smoothing_interval: u32) {
|
2022-02-16 05:48:54 +11:00
|
|
|
// In addition to updating the filters, we should also clear the filter's state when
|
|
|
|
// changing a setting we can't neatly interpolate between.
|
|
|
|
let reset_filters = self
|
2022-02-14 05:49:18 +11:00
|
|
|
.should_update_filters
|
|
|
|
.compare_exchange(true, false, Ordering::Acquire, Ordering::Relaxed)
|
2022-02-16 05:48:54 +11:00
|
|
|
.is_ok();
|
|
|
|
let should_update_filters = reset_filters
|
2022-02-14 05:49:18 +11:00
|
|
|
|| ((self.params.filter_frequency.smoothed.is_smoothing()
|
2022-02-15 09:59:40 +11:00
|
|
|
|| self.params.filter_resonance.smoothed.is_smoothing()
|
|
|
|
|| self.params.filter_spread_octaves.smoothed.is_smoothing())
|
2022-02-14 05:49:18 +11:00
|
|
|
&& self.next_filter_smoothing_in <= 1);
|
|
|
|
if should_update_filters {
|
2022-02-16 05:48:54 +11:00
|
|
|
self.update_filters(smoothing_interval, reset_filters);
|
2022-02-14 05:49:18 +11:00
|
|
|
self.next_filter_smoothing_in = smoothing_interval as i32;
|
|
|
|
} else {
|
|
|
|
self.next_filter_smoothing_in -= 1;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Recompute the filter coefficients based on the smoothed paraetersm. We can skip forwardq in
|
|
|
|
/// larger steps to reduce the DSP load.
|
2022-02-16 05:48:54 +11:00
|
|
|
fn update_filters(&mut self, smoothing_interval: u32, reset_filters: bool) {
|
2022-02-15 09:59:40 +11:00
|
|
|
if self.filters.is_empty() {
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
let frequency = self
|
|
|
|
.params
|
|
|
|
.filter_frequency
|
|
|
|
.smoothed
|
|
|
|
.next_step(smoothing_interval);
|
|
|
|
let resonance = self
|
|
|
|
.params
|
|
|
|
.filter_resonance
|
|
|
|
.smoothed
|
|
|
|
.next_step(smoothing_interval);
|
|
|
|
let spread_octaves = self
|
|
|
|
.params
|
|
|
|
.filter_spread_octaves
|
|
|
|
.smoothed
|
|
|
|
.next_step(smoothing_interval);
|
|
|
|
let spread_style = self.params.filter_spread_style.value();
|
|
|
|
|
2022-03-03 02:49:16 +11:00
|
|
|
// Used to calculate the linear spread. This is calculated in such a way that the range
|
|
|
|
// never dips below 0.
|
|
|
|
let max_octave_spread = if spread_octaves >= 0.0 {
|
|
|
|
frequency - (frequency * 2.0f32.powf(-spread_octaves))
|
|
|
|
} else {
|
|
|
|
(frequency * 2.0f32.powf(spread_octaves)) - frequency
|
|
|
|
};
|
|
|
|
|
2022-03-03 03:04:01 +11:00
|
|
|
// TODO: This wrecks the DSP load at high smoothing accuracy, perhaps also use SIMD here
|
2022-02-15 09:59:40 +11:00
|
|
|
const MIN_FREQUENCY: f32 = 5.0;
|
|
|
|
let max_frequency = self.sample_rate / 2.05;
|
|
|
|
for filter_idx in 0..self.params.filter_stages.value as usize {
|
|
|
|
// The index of the filter normalized to range [-1, 1]
|
|
|
|
let filter_proportion =
|
|
|
|
(filter_idx as f32 / self.params.filter_stages.value as f32) * 2.0 - 1.0;
|
|
|
|
|
|
|
|
// The spread parameter adds an offset to the frequency depending on the number of the
|
|
|
|
// filter
|
|
|
|
let filter_frequency = match spread_style {
|
|
|
|
SpreadStyle::Octaves => frequency * 2.0f32.powf(spread_octaves * filter_proportion),
|
2022-03-03 02:49:16 +11:00
|
|
|
SpreadStyle::Linear => frequency + (max_octave_spread * filter_proportion),
|
2022-02-15 09:59:40 +11:00
|
|
|
}
|
|
|
|
.clamp(MIN_FREQUENCY, max_frequency);
|
|
|
|
|
2022-03-04 22:49:36 +11:00
|
|
|
self.filters[filter_idx].coefficients =
|
2022-02-15 09:59:40 +11:00
|
|
|
filter::BiquadCoefficients::allpass(self.sample_rate, filter_frequency, resonance);
|
2022-03-04 22:49:36 +11:00
|
|
|
if reset_filters {
|
|
|
|
self.filters[filter_idx].reset();
|
2022-02-16 04:30:45 +11:00
|
|
|
}
|
2022-02-13 07:12:08 +11:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2022-02-14 05:49:18 +11:00
|
|
|
fn normalize_automation_precision(step_size: u32) -> f32 {
|
2022-02-14 05:27:50 +11:00
|
|
|
(MAX_AUTOMATION_STEP_SIZE - step_size) as f32
|
|
|
|
/ (MAX_AUTOMATION_STEP_SIZE - MIN_AUTOMATION_STEP_SIZE) as f32
|
|
|
|
}
|
|
|
|
|
2022-02-14 05:49:18 +11:00
|
|
|
fn unnormalize_automation_precision(normalized: f32) -> u32 {
|
2022-02-14 05:27:50 +11:00
|
|
|
MAX_AUTOMATION_STEP_SIZE
|
2022-02-14 05:49:18 +11:00
|
|
|
- (normalized * (MAX_AUTOMATION_STEP_SIZE - MIN_AUTOMATION_STEP_SIZE) as f32).round() as u32
|
2022-02-14 05:27:50 +11:00
|
|
|
}
|
|
|
|
|
2022-03-01 03:04:39 +11:00
|
|
|
impl ClapPlugin for Diopser {
|
|
|
|
const CLAP_ID: &'static str = "nl.robbertvanderhelm.diopser";
|
2022-03-01 03:18:11 +11:00
|
|
|
const CLAP_DESCRIPTION: &'static str = "A totally original phase rotation plugin";
|
2022-03-09 03:38:46 +11:00
|
|
|
const CLAP_FEATURES: &'static [&'static str] = &["audio_effect", "stereo", "filter", "utility"];
|
2022-03-01 03:18:11 +11:00
|
|
|
const CLAP_MANUAL_URL: &'static str = Self::URL;
|
|
|
|
const CLAP_SUPPORT_URL: &'static str = Self::URL;
|
2022-03-01 03:04:39 +11:00
|
|
|
}
|
2022-03-01 00:45:07 +11:00
|
|
|
|
2022-02-13 02:27:57 +11:00
|
|
|
impl Vst3Plugin for Diopser {
|
|
|
|
const VST3_CLASS_ID: [u8; 16] = *b"DiopserPlugRvdH.";
|
|
|
|
const VST3_CATEGORIES: &'static str = "Fx|Filter";
|
|
|
|
}
|
|
|
|
|
2022-03-01 00:45:31 +11:00
|
|
|
nih_export_clap!(Diopser);
|
2022-02-13 02:27:57 +11:00
|
|
|
nih_export_vst3!(Diopser);
|