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+ "memchr",
+]
+
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+name = "xtask"
+version = "0.1.0"
+dependencies = [
+ "nih_plug_xtask",
+]

Cargo.toml

@@ -0,0 +1,25 @@
+[package]
+name = "mid_side"
+version = "0.1.0"
+edition = "2021"
+license = ""
+homepage = "https://som.codes/plugins/"
+description = "simple mid/side decoder"
+
+[workspace]
+members = ["xtask"]
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+nih_plug = { git = "https://github.com/robbert-vdh/nih-plug.git", features = ["assert_process_allocs"] }
+
+[profile.release]
+lto = "thin"
+strip = "symbols"
+
+[profile.profiling]
+inherits = "release"
+debug = true
+strip = "none"

README.md

@@ -0,0 +1,12 @@
+# charlotte's mid side
+
+simple mid side decoder. left channel -> mid, right channel -> side (positive values pan right, negative values pan left)
+
+## Building
+
+```shell
+$ # macos:
+$ cargo xtask bundle-universal mid_side --release
+$ # everything else:
+$ cargo xtask bundle mid_side --release
+```

bundler.toml

@@ -0,0 +1,8 @@
+# This provides metadata for NIH-plug's `cargo xtask bundle <foo>` plugin
+# bundler. This file's syntax is as follows:
+#
+# [package_name]
+# name = "Human Readable Plugin Name"  # defaults to <package_name>
+
+[mid_side]
+name = "char mid side"

src/lib.rs

@@ -0,0 +1,109 @@
+use nih_plug::prelude::*;
+use std::sync::Arc;
+
+fn decode_mid_side(channel_0: &mut [f32], channel_1: &mut [f32]) {
+    // positive sides -> pan right
+    // negative sides -> pan left
+
+    assert_eq!(channel_0.len(), channel_1.len());
+
+    for sample_idx in 0..channel_0.len() {
+        let mid = channel_0[sample_idx];
+        let side = channel_1[sample_idx];
+
+        let left = mid - side;
+        let right = mid + side;
+
+        channel_0[sample_idx] = left;
+        channel_1[sample_idx] = right;
+    }
+}
+
+// time to wire up nih-plug. all of this is boilerplate
+
+#[derive(Params)]
+struct MidSideParams {}
+
+struct MidSide {
+    params: Arc<MidSideParams>,
+}
+
+impl Default for MidSide {
+    fn default() -> Self {
+        Self {
+            params: Arc::new(MidSideParams {}),
+        }
+    }
+}
+
+impl Plugin for MidSide {
+    const NAME: &'static str = "charlotte's mid side";
+    const VENDOR: &'static str = "charlotte athena som";
+    const URL: &'static str = env!("CARGO_PKG_HOMEPAGE");
+    const EMAIL: &'static str = "charlotte@som.codes";
+
+    const VERSION: &'static str = env!("CARGO_PKG_VERSION");
+
+    const AUDIO_IO_LAYOUTS: &'static [AudioIOLayout] = &[AudioIOLayout {
+        main_input_channels: NonZeroU32::new(2),
+        main_output_channels: NonZeroU32::new(2),
+
+        aux_input_ports: &[],
+        aux_output_ports: &[],
+
+        names: PortNames::const_default(),
+    }];
+
+    const MIDI_INPUT: MidiConfig = MidiConfig::None;
+    const MIDI_OUTPUT: MidiConfig = MidiConfig::None;
+
+    type SysExMessage = ();
+    type BackgroundTask = ();
+
+    fn initialize(
+        &mut self,
+        _audio_io_layout: &AudioIOLayout,
+        _buffer_config: &BufferConfig,
+        _context: &mut impl InitContext<Self>,
+    ) -> bool {
+        true
+    }
+
+    fn reset(&mut self) {}
+
+    fn process(
+        &mut self,
+        buffer: &mut Buffer,
+        _aux: &mut AuxiliaryBuffers,
+        _context: &mut impl ProcessContext<Self>,
+    ) -> ProcessStatus {
+        assert_eq!(buffer.channels(), 2);
+
+        for (_block_idx, block) in buffer.iter_blocks(128) {
+            let mut block_channels = block.into_iter();
+
+            let channel_0 = block_channels.next().unwrap();
+            let channel_1 = block_channels.next().unwrap();
+
+            decode_mid_side(channel_0, channel_1);
+        }
+
+        ProcessStatus::Normal
+    }
+
+    fn params(&self) -> Arc<dyn Params> {
+        self.params.clone()
+    }
+}
+
+impl Vst3Plugin for MidSide {
+    const VST3_CLASS_ID: [u8; 16] = *b"charmid-side\0\0\0\0";
+
+    const VST3_SUBCATEGORIES: &'static [Vst3SubCategory] = &[
+        Vst3SubCategory::Fx,
+        Vst3SubCategory::Tools,
+        Vst3SubCategory::Stereo, // this plugin only supports stereo configuration
+    ];
+}
+
+nih_export_vst3!(MidSide);

xtask/Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name = "xtask"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+nih_plug_xtask = { git = "https://github.com/robbert-vdh/nih-plug.git" }

xtask/src/main.rs

@@ -0,0 +1,3 @@
+fn main() -> nih_plug_xtask::Result<()> {
+    nih_plug_xtask::main()
+}