pipewire: add pipewire client

src/pipewire/pw_object.rs

@@ -0,0 +1,52 @@
+use {
+    crate::{pipewire::pw_parser::PwParser, utils::numcell::NumCell},
+    std::{cell::Cell, fmt::Debug, rc::Rc},
+    thiserror::Error,
+};
+
+pub trait PwObjectBase {
+    fn data(&self) -> &PwObjectData;
+    fn interface(&self) -> &str;
+    fn handle_msg(self: Rc<Self>, opcode: u8, parser: PwParser<'_>) -> Result<(), PwObjectError>;
+    fn event_name(&self, opcode: u8) -> Option<&'static str>;
+}
+
+pub trait PwObject: PwObjectBase {
+    fn bound_id(&self, id: u32) {
+        let _ = id;
+    }
+
+    fn done(&self) {}
+
+    fn break_loops(&self) {}
+}
+
+pub struct PwObjectData {
+    pub id: u32,
+    pub bound_id: Cell<Option<u32>>,
+    pub sync_id: NumCell<u32>,
+}
+
+#[derive(Debug, Error)]
+#[error("An error occurred in a `{interface}`")]
+pub struct PwObjectError {
+    pub interface: &'static str,
+    #[source]
+    pub source: PwObjectErrorType,
+}
+
+#[derive(Debug, Error)]
+pub enum PwObjectErrorType {
+    #[error("Unknown event {0}")]
+    UnknownEvent(u8),
+    #[error("An error occurred in event `{method}`")]
+    EventError {
+        method: &'static str,
+        #[source]
+        source: Box<dyn std::error::Error>,
+    },
+}
+
+pub trait PwOpcode: Debug {
+    fn id(&self) -> u8;
+}