132 lines
4.4 KiB
Rust
132 lines
4.4 KiB
Rust
// Crisp: a distortion plugin but not quite
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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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use nih_plug::prelude::*;
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use std::pin::Pin;
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mod pcg;
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/// Hardcoded to make SIMD-ifying this a bit easier in the future
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const NUM_CHANNELS: usize = 2;
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/// These seeds being fixed makes bouncing deterministic.
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const INITIAL_PRNG_SEEDS: [u32; 2] = [69, 420];
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/// This plugin essentially layers the sound with another copy of the signal AM'ed with white (or
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/// filtered) noise. That other copy of the sound may have a low pass filter applied to it since
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/// this effect just turns into literal noise at high frequencies.
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struct Crisp {
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params: Pin<Box<CrispParams>>,
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/// The OS RNG is only used for the initial seeds, after that we'll implement PCG ourselves so
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/// we can easily SIMD-ify this in the future.
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prng_seeds: [u32; NUM_CHANNELS],
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}
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// TODO: Filters
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// TODO: Mono/stereo/mid-side switch
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// TODO: Output gain
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#[derive(Params)]
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pub struct CrispParams {
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/// On a range of `[0, 1]`, how much of the modulated sound to mix in.
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#[id = "amount"]
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amount: FloatParam,
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}
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impl Default for Crisp {
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fn default() -> Self {
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Self {
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params: Box::pin(CrispParams::default()),
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prng_seeds: INITIAL_PRNG_SEEDS,
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}
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}
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}
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impl Default for CrispParams {
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#[allow(clippy::derivable_impls)]
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fn default() -> Self {
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Self {
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amount: FloatParam::new("Amount", 0.2, FloatRange::Linear { min: 0.0, max: 1.0 })
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.with_smoother(SmoothingStyle::Linear(10.0))
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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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impl Plugin for Crisp {
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const NAME: &'static str = "Crisp";
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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 = "0.1.0";
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const DEFAULT_NUM_INPUTS: u32 = 2;
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const DEFAULT_NUM_OUTPUTS: u32 = 2;
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fn params(&self) -> Pin<&dyn Params> {
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self.params.as_ref()
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}
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fn accepts_bus_config(&self, config: &BusConfig) -> bool {
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// We'll add a SIMD version in a bit which 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 reset(&mut self) {
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// By using the same seeds each time bouncing can be made deterministic
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self.prng_seeds = INITIAL_PRNG_SEEDS;
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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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for channel_samples in buffer.iter_mut() {
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let amount = self.params.amount.smoothed.next();
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// TODO: SIMD-ize this to process both channels at once
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for (channel_idx, sample) in channel_samples.into_iter().enumerate() {
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// TODO: Calculate some uniformly (or Gaussian?) distributed white noise in the
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// range of `[-1, 1]`, add that scaled by `amount` to `sample`.
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}
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}
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ProcessStatus::Normal
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}
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}
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impl ClapPlugin for Crisp {
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const CLAP_ID: &'static str = "nl.robbertvanderhelm.crisp";
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const CLAP_DESCRIPTION: &'static str = "Adds a bright crispy top end to low bass sounds";
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const CLAP_FEATURES: &'static [&'static str] =
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&["audio_effect", "stereo", "filter", "distortion"];
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const CLAP_MANUAL_URL: &'static str = Self::URL;
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const CLAP_SUPPORT_URL: &'static str = Self::URL;
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}
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impl Vst3Plugin for Crisp {
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const VST3_CLASS_ID: [u8; 16] = *b"CrispPluginRvdH.";
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const VST3_CATEGORIES: &'static str = "Fx|Filter|Distortion";
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}
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nih_export_clap!(Crisp);
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nih_export_vst3!(Crisp);
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