Refactored MpvEventHandler and implemented basic event listener

src/basic_listener.rs

@@ -0,0 +1,51 @@
+use crate::mpv_event_handler::events::{MpvEvent, Listener, FileInfo};
+
+pub struct MpvListener;
+
+impl MpvListener {
+    fn print_file_info(&self, file_info: FileInfo) {
+        let FileInfo {filename, metadata} = file_info;
+
+        println!("[RPC] FILENAME: {filename}");
+        
+        if let Some(artist) = metadata.artist {
+            println!("[RPC] ARTIST: {artist}");
+        }
+
+        if let Some(album) = metadata.album {
+            println!("[RPC] ALBUM: {album}");
+        }
+
+        if let Some(title) = metadata.title {
+            println!("[RPC] TITLE: {title}");
+        }
+
+        if let Some(track) = metadata.track {
+            println!("[RPC] TRACK: {track}");
+        }
+    }
+
+    fn print_seek_time(&self, time: i64) {
+        println!("[RPC] SEEKING: {time}");
+    }
+
+    fn print_play(&self) {
+        println!("[RPC] PLAY");
+    }
+
+    fn print_pause(&self) {
+        println!("[RPC] PAUSE");
+    }
+}
+
+
+impl Listener for MpvListener {
+    fn handle_event(&self, event: MpvEvent) {
+        match event {
+            MpvEvent::FileLoaded(file_info) => self.print_file_info(file_info),
+            MpvEvent::Seek(time) => self.print_seek_time(time),
+            MpvEvent::Pause => self.print_pause(),
+            MpvEvent::Play => self.print_play(),
+        }
+    }
+}

src/lib.rs

@@ -1,10 +1,17 @@
 use mpv_client::mpv_handle;
 
 mod mpv_event_handler;
+mod basic_listener; // For testing purposes
 
 #[no_mangle]
 fn mpv_open_cplugin(handle: *mut mpv_handle) -> std::os::raw::c_int {
-    let client = mpv_event_handler::MpvHandler::from_ptr(handle);
+    let listener = Box::new(basic_listener::MpvListener);
+    let client = mpv_event_handler::MpvEventHandler::from_ptr(handle, listener);
+
+    if let Err(e) = client.initialize() {
+        println!("[RPC] Error initializing mpv client: {e}")
+    }
+
     while client.poll_events() {
 
     }

src/mpv_event_handler.rs

@@ -1,21 +1,33 @@
-use mpv_client::{Handle, Event, Property, mpv_handle};
+use mpv_client::{Handle, Event, Property, Format, mpv_handle};
 
-pub struct MpvHandler {
-    mpv: Handle
+pub mod events;
+use events::{MpvEvent, Listener, FileInfo, FileMetadata};
+
+
+const NAME_PAUSE_PROP: &str = "pause";
+const REPL_PAUSE_PROP: u64 = 1;
+
+pub struct MpvEventHandler {
+    mpv: Handle,
+    listener: Box<dyn Listener>
 }
 
-impl MpvHandler {
-    pub fn new(mpv: Handle) -> Self {
+impl MpvEventHandler {
+    pub fn new<'a>(mpv: Handle, listener: Box<dyn Listener>) -> Self {
         Self {
-            mpv
+            mpv,
+            listener
         }
     }
 
-    pub fn from_ptr(handle: *mut mpv_handle) -> Self {
-        MpvHandler::new(Handle::from_ptr(handle))
+    pub fn from_ptr<'a>(handle: *mut mpv_handle, listener: Box<dyn Listener>) -> Self {
+        MpvEventHandler::new(Handle::from_ptr(handle), listener)
+    }
+
+    pub fn initialize(&self) -> Result<(), String> {
+       self.observe_property(REPL_PAUSE_PROP, NAME_PAUSE_PROP, bool::MPV_FORMAT)
     }
 
-    #[allow(dead_code)]
     fn observe_property(&self, id: u64, name: &str, format: i32) -> Result<(), String>{
         match self.mpv.observe_property(id, name, format) {
             Ok(_) => Ok(()),
@@ -23,10 +35,10 @@ impl MpvHandler {
         }
     }
 
-    #[allow(dead_code)]
-    fn on_property_change(&self, prop_id: u64, _prop: Property) {
+    fn on_property_change(&self, prop_id: u64, prop: Property) {
         println!("[RPC] Property changed: {prop_id}");
         match prop_id {
+            REPL_PAUSE_PROP => self.handle_pause_change(prop.data().unwrap()),
             _ => ()
         }
     }
@@ -34,12 +46,62 @@ impl MpvHandler {
     fn handle_event(&self, event: Event) {
         println!("[RPC] Event: {event}");
         match event {
+            Event::FileLoaded => self.handle_file_loaded(),
+            Event::PlaybackRestart => self.handle_playback_restart(),
             _ => ()
         }
     }
 
+    // TODO
+    // Replace unwrap with error handling
+    fn handle_file_loaded(&self) {
+        let filename = self.mpv.get_property("filename").unwrap();
+        let artist = self.mpv.get_property("metadata/by-key/artist").ok();
+        let album = self.mpv.get_property("metadata/by-key/album").ok();
+        let title = self.mpv.get_property("metadata/by-key/title").ok();
+        let track = self.mpv.get_property("metadata/by-key/Artist").ok();
+
+        let metadata = FileMetadata {
+            artist,
+            album,
+            title,
+            track
+        };
+
+        let file_info = FileInfo {
+            filename,
+            metadata
+        };
+
+        let event = MpvEvent::FileLoaded(file_info);
+        self.listener.handle_event(event);
+    }
+
+    fn handle_playback_restart(&self) {
+        let res = self.mpv.get_property("playback-time").ok();
+        match res {
+            Some(time) => {
+                let event = MpvEvent::Seek(time);
+                self.listener.handle_event(event);
+            }
+            None => {
+                println!("[RPC] Failed retrieving playback-time.");
+                println!("[RPC] This usually happens seeking into file end. Possibly mpv bug?");
+            },
+        }
+    }
+
+    fn handle_pause_change(&self, pause: bool) {
+        let event = match pause {
+            false => MpvEvent::Play,
+            true => MpvEvent::Pause
+        };
+        self.listener.handle_event(event);
+    }
+
     // TODO! 
-    // Add logging
+    // Add logging and error handling,
+    // yes unwrap on property changes and events
     pub fn poll_events(&self) -> bool {
         match self.mpv.wait_event(0.0) {
             Event::None => (),

src/mpv_event_handler/events.rs

@@ -0,0 +1,22 @@
+pub struct FileInfo {
+    pub filename: String,
+    pub metadata: FileMetadata
+}
+
+pub struct FileMetadata {
+    pub artist: Option<String>,
+    pub album: Option<String>,
+    pub title: Option<String>,
+    pub track: Option<String>
+}
+
+pub enum MpvEvent {
+    FileLoaded(FileInfo),
+    Seek(i64),
+    Pause,
+    Play
+}
+
+pub trait Listener {
+    fn handle_event(&self, event: MpvEvent);
+}