extract plugin crate

plugin/src/lv2_tui.rs

@@ -0,0 +1,47 @@
+
+use super::*;
+use ::livi::{
+    World,
+    Instance,
+    Plugin as LiviPlugin,
+    Features,
+    FeaturesBuilder,
+    Port,
+    event::LV2AtomSequence,
+};
+use std::thread::JoinHandle;
+
+/// A LV2 plugin.
+pub struct LV2Plugin {
+    pub world:        World,
+    pub instance:     Instance,
+    pub plugin:       LiviPlugin,
+    pub features:     Arc<Features>,
+    pub port_list:    Vec<Port>,
+    pub input_buffer: Vec<LV2AtomSequence>,
+    pub ui_thread:    Option<JoinHandle<()>>,
+}
+
+impl LV2Plugin {
+    const INPUT_BUFFER: usize = 1024;
+    pub fn new (uri: &str) -> Usually<Self> {
+        // Get 1st plugin at URI
+        let world    = World::with_load_bundle(&uri);
+        let features = FeaturesBuilder { min_block_length: 1, max_block_length: 65536 };
+        let features = world.build_features(features);
+        let mut plugin = None;
+        if let Some(p) = world.iter_plugins().next() { plugin = Some(p); }
+        let plugin   = plugin.expect("plugin not found");
+        let err      = &format!("init {uri}");
+        let instance = unsafe { plugin.instantiate(features.clone(), 48000.0).expect(&err) };
+        let mut port_list = vec![];
+        for port in plugin.ports() {
+            port_list.push(port);
+        }
+        let input_buffer = Vec::with_capacity(Self::INPUT_BUFFER);
+        // Instantiate
+        Ok(Self {
+            world, instance, port_list, plugin, features, input_buffer, ui_thread: None
+        })
+    }
+}