Merge pull request #1053 from JasonLG1979/connect-event

Major events overhaul

CHANGELOG.md

@@ -79,9 +79,20 @@ https://github.com/librespot-org/librespot
   disabled such content. Applications that use librespot as a library without
   Connect should use the 'filter-explicit-content' user attribute in the session.
 - [metadata] All metadata fields in the protobufs are now exposed (breaking)
+- [connect] Add session events
+- [playback] Add metadata support via a `TrackChanged` event
+- [main] Add all player events to `player_event_handler.rs`
+- [contrib] Add `event_handler_example.py`
+- [connect] Add `repeat`, `set_position_ms` and `set_volume` to `spirc.rs`
+- [main] Add an event worker thread that runs async to the main thread(s) but sync to itself to prevent potential data races for event consumers
 
 ### Fixed
 
+- [connect] Set `PlayStatus` to the correct value when Player is loading to avoid blanking out the controls when `self.play_status` is `LoadingPlay` or `LoadingPause` in `spirc.rs`
+- [connect] Handle attempts to play local files better by basically ignoring attempts to load them in `handle_remote_update` in `spirc.rs`
+- [playback] Handle invalid track start positions by just starting the track from the beginning
+- [playback, connect] Clean up and de-noise events and event firing
+- [playback] Handle disappearing and invalid devices better 
 ### Removed
 
 - [main] `autoplay` is no longer a command-line option. Instead, librespot now

connect/src/spirc.rs

@@ -44,6 +44,8 @@ use crate::{
 pub enum SpircError {
     #[error("response payload empty")]
     NoData,
+    #[error("playback of local files is not supported")]
+    UnsupportedLocalPlayBack,
     #[error("message addressed at another ident: {0}")]
     Ident(String),
     #[error("message pushed for another URI")]
@@ -52,10 +54,10 @@ pub enum SpircError {
 
 impl From<SpircError> for Error {
     fn from(err: SpircError) -> Self {
+        use SpircError::*;
         match err {
-            SpircError::NoData => Error::unavailable(err),
+            NoData | UnsupportedLocalPlayBack => Error::unavailable(err),
-            SpircError::Ident(_) => Error::aborted(err),
+            Ident(_) | InvalidUri(_) => Error::aborted(err),
-            SpircError::InvalidUri(_) => Error::aborted(err),
         }
     }
 }
@@ -113,6 +115,7 @@ struct SpircTask {
 
 static SPIRC_COUNTER: AtomicUsize = AtomicUsize::new(0);
 
+#[derive(Debug)]
 pub enum SpircCommand {
     Play,
     PlayPause,
@@ -122,7 +125,11 @@ pub enum SpircCommand {
     VolumeUp,
     VolumeDown,
     Shutdown,
-    Shuffle,
+    Shuffle(bool),
+    Repeat(bool),
+    Disconnect,
+    SetPosition(u32),
+    SetVolume(u16),
 }
 
 const CONTEXT_TRACKS_HISTORY: usize = 10;
@@ -243,10 +250,8 @@ fn initial_device_state(config: ConnectConfig) -> DeviceState {
                 msg.set_typ(protocol::spirc::CapabilityType::kSupportedTypes);
                 {
                     let repeated = msg.mut_stringValue();
-                    repeated.push(::std::convert::Into::into("audio/local"));
                     repeated.push(::std::convert::Into::into("audio/track"));
                     repeated.push(::std::convert::Into::into("audio/episode"));
-                    repeated.push(::std::convert::Into::into("local"));
                     repeated.push(::std::convert::Into::into("track"))
                 };
                 msg
@@ -416,8 +421,20 @@ impl Spirc {
     pub fn shutdown(&self) -> Result<(), Error> {
         Ok(self.commands.send(SpircCommand::Shutdown)?)
     }
-    pub fn shuffle(&self) -> Result<(), Error> {
+    pub fn shuffle(&self, shuffle: bool) -> Result<(), Error> {
-        Ok(self.commands.send(SpircCommand::Shuffle)?)
+        Ok(self.commands.send(SpircCommand::Shuffle(shuffle))?)
+    }
+    pub fn repeat(&self, repeat: bool) -> Result<(), Error> {
+        Ok(self.commands.send(SpircCommand::Repeat(repeat))?)
+    }
+    pub fn set_volume(&self, volume: u16) -> Result<(), Error> {
+        Ok(self.commands.send(SpircCommand::SetVolume(volume))?)
+    }
+    pub fn set_position_ms(&self, position_ms: u32) -> Result<(), Error> {
+        Ok(self.commands.send(SpircCommand::SetPosition(position_ms))?)
+    }
+    pub fn disconnect(&self) -> Result<(), Error> {
+        Ok(self.commands.send(SpircCommand::Disconnect)?)
     }
 }
 
@@ -552,76 +569,71 @@ impl SpircTask {
     }
 
     fn handle_command(&mut self, cmd: SpircCommand) -> Result<(), Error> {
-        let active = self.device.get_is_active();
+        if matches!(cmd, SpircCommand::Shutdown) {
-        match cmd {
+            trace!("Received SpircCommand::Shutdown");
-            SpircCommand::Play => {
-                if active {
-                    self.handle_play();
-                    self.notify(None)
-                } else {
-                    CommandSender::new(self, MessageType::kMessageTypePlay).send()
-                }
-            }
-            SpircCommand::PlayPause => {
-                if active {
-                    self.handle_play_pause();
-                    self.notify(None)
-                } else {
-                    CommandSender::new(self, MessageType::kMessageTypePlayPause).send()
-                }
-            }
-            SpircCommand::Pause => {
-                if active {
-                    self.handle_pause();
-                    self.notify(None)
-                } else {
-                    CommandSender::new(self, MessageType::kMessageTypePause).send()
-                }
-            }
-            SpircCommand::Prev => {
-                if active {
-                    self.handle_prev();
-                    self.notify(None)
-                } else {
-                    CommandSender::new(self, MessageType::kMessageTypePrev).send()
-                }
-            }
-            SpircCommand::Next => {
-                if active {
-                    self.handle_next();
-                    self.notify(None)
-                } else {
-                    CommandSender::new(self, MessageType::kMessageTypeNext).send()
-                }
-            }
-            SpircCommand::VolumeUp => {
-                if active {
-                    self.handle_volume_up();
-                    self.notify(None)
-                } else {
-                    CommandSender::new(self, MessageType::kMessageTypeVolumeUp).send()
-                }
-            }
-            SpircCommand::VolumeDown => {
-                if active {
-                    self.handle_volume_down();
-                    self.notify(None)
-                } else {
-                    CommandSender::new(self, MessageType::kMessageTypeVolumeDown).send()
-                }
-            }
-            SpircCommand::Shutdown => {
             CommandSender::new(self, MessageType::kMessageTypeGoodbye).send()?;
-                self.player.stop();
+            self.handle_disconnect();
             self.shutdown = true;
             if let Some(rx) = self.commands.as_mut() {
                 rx.close()
             }
             Ok(())
+        } else if self.device.get_is_active() {
+            trace!("Received SpircCommand::{:?}", cmd);
+            match cmd {
+                SpircCommand::Play => {
+                    self.handle_play();
+                    self.notify(None)
                 }
-            SpircCommand::Shuffle => {
+                SpircCommand::PlayPause => {
-                CommandSender::new(self, MessageType::kMessageTypeShuffle).send()
+                    self.handle_play_pause();
+                    self.notify(None)
                 }
+                SpircCommand::Pause => {
+                    self.handle_pause();
+                    self.notify(None)
+                }
+                SpircCommand::Prev => {
+                    self.handle_prev();
+                    self.notify(None)
+                }
+                SpircCommand::Next => {
+                    self.handle_next();
+                    self.notify(None)
+                }
+                SpircCommand::VolumeUp => {
+                    self.handle_volume_up();
+                    self.notify(None)
+                }
+                SpircCommand::VolumeDown => {
+                    self.handle_volume_down();
+                    self.notify(None)
+                }
+                SpircCommand::Disconnect => {
+                    self.handle_disconnect();
+                    self.notify(None)
+                }
+                SpircCommand::Shuffle(shuffle) => {
+                    self.state.set_shuffle(shuffle);
+                    self.notify(None)
+                }
+                SpircCommand::Repeat(repeat) => {
+                    self.state.set_repeat(repeat);
+                    self.notify(None)
+                }
+                SpircCommand::SetPosition(position) => {
+                    self.handle_seek(position);
+                    self.notify(None)
+                }
+                SpircCommand::SetVolume(volume) => {
+                    self.set_volume(volume);
+                    self.notify(None)
+                }
+                _ => Ok(()),
+            }
+        } else {
+            warn!("SpircCommand::{:?} will be ignored while Not Active", cmd);
+            Ok(())
         }
     }
 
@@ -635,11 +647,28 @@ impl SpircTask {
                 match event {
                     PlayerEvent::EndOfTrack { .. } => self.handle_end_of_track(),
                     PlayerEvent::Loading { .. } => {
-                        trace!("==> kPlayStatusLoading");
+                        match self.play_status {
+                            SpircPlayStatus::LoadingPlay { position_ms } => {
+                                self.update_state_position(position_ms);
+                                self.state.set_status(PlayStatus::kPlayStatusPlay);
+                                trace!("==> kPlayStatusPlay");
+                            }
+                            SpircPlayStatus::LoadingPause { position_ms } => {
+                                self.update_state_position(position_ms);
+                                self.state.set_status(PlayStatus::kPlayStatusPause);
+                                trace!("==> kPlayStatusPause");
+                            }
+                            _ => {
                                 self.state.set_status(PlayStatus::kPlayStatusLoading);
+                                self.update_state_position(0);
+                                trace!("==> kPlayStatusLoading");
+                            }
+                        }
                         self.notify(None)
                     }
-                    PlayerEvent::Playing { position_ms, .. } => {
+                    PlayerEvent::Playing { position_ms, .. }
+                    | PlayerEvent::PositionCorrection { position_ms, .. }
+                    | PlayerEvent::Seeked { position_ms, .. } => {
                         trace!("==> kPlayStatusPlay");
                         let new_nominal_start_time = self.now_ms() - position_ms as i64;
                         match self.play_status {
@@ -674,17 +703,14 @@ impl SpircTask {
                     } => {
                         trace!("==> kPlayStatusPause");
                         match self.play_status {
-                            SpircPlayStatus::Paused {
+                            SpircPlayStatus::Paused { .. } | SpircPlayStatus::Playing { .. } => {
-                                ref mut position_ms,
+                                self.state.set_status(PlayStatus::kPlayStatusPause);
-                                ..
-                            } => {
-                                if *position_ms != new_position_ms {
-                                    *position_ms = new_position_ms;
                                 self.update_state_position(new_position_ms);
+                                self.play_status = SpircPlayStatus::Paused {
+                                    position_ms: new_position_ms,
+                                    preloading_of_next_track_triggered: false,
+                                };
                                 self.notify(None)
-                                } else {
-                                    Ok(())
-                                }
                             }
                             SpircPlayStatus::LoadingPlay { .. }
                             | SpircPlayStatus::LoadingPause { .. } => {
@@ -762,7 +788,13 @@ impl SpircTask {
                 );
 
                 if key == "filter-explicit-content" && new_value == "1" {
-                    self.player.skip_explicit_content();
+                    self.player
+                        .emit_filter_explicit_content_changed_event(matches!(new_value, "1"));
+                }
+
+                if key == "autoplay" && old_value != new_value {
+                    self.player
+                        .emit_auto_play_changed_event(matches!(new_value, "1"));
                 }
             } else {
                 trace!(
@@ -785,13 +817,31 @@ impl SpircTask {
             return Err(SpircError::Ident(ident.to_string()).into());
         }
 
+        let old_client_id = self.session.client_id();
+
         for entry in update.get_device_state().get_metadata().iter() {
-            if entry.get_field_type() == "client_id" {
+            match entry.get_field_type() {
-                self.session.set_client_id(entry.get_metadata());
+                "client-id" => self.session.set_client_id(entry.get_metadata()),
-                break;
+                "brand_display_name" => self.session.set_client_brand_name(entry.get_metadata()),
+                "model_display_name" => self.session.set_client_model_name(entry.get_metadata()),
+                _ => (),
             }
         }
 
+        self.session
+            .set_client_name(update.get_device_state().get_name());
+
+        let new_client_id = self.session.client_id();
+
+        if self.device.get_is_active() && new_client_id != old_client_id {
+            self.player.emit_session_client_changed_event(
+                new_client_id,
+                self.session.client_name(),
+                self.session.client_brand_name(),
+                self.session.client_model_name(),
+            );
+        }
+
         match update.get_typ() {
             MessageType::kMessageTypeHello => self.notify(Some(ident)),
 
@@ -800,6 +850,40 @@ impl SpircTask {
                     let now = self.now_ms();
                     self.device.set_is_active(true);
                     self.device.set_became_active_at(now);
+                    self.player.emit_session_connected_event(
+                        self.session.connection_id(),
+                        self.session.username(),
+                    );
+                    self.player.emit_session_client_changed_event(
+                        self.session.client_id(),
+                        self.session.client_name(),
+                        self.session.client_brand_name(),
+                        self.session.client_model_name(),
+                    );
+
+                    self.player
+                        .emit_volume_changed_event(self.device.get_volume() as u16);
+
+                    self.player
+                        .emit_auto_play_changed_event(self.session.autoplay());
+
+                    self.player.emit_filter_explicit_content_changed_event(
+                        self.session.filter_explicit_content(),
+                    );
+
+                    self.player
+                        .emit_shuffle_changed_event(self.state.get_shuffle());
+
+                    self.player
+                        .emit_repeat_changed_event(self.state.get_repeat());
+                }
+
+                let context_uri = update.get_state().get_context_uri().to_owned();
+
+                // completely ignore local playback.
+                if context_uri.starts_with("spotify:local-files") {
+                    self.notify(None)?;
+                    return Err(SpircError::UnsupportedLocalPlayBack.into());
                 }
 
                 self.update_tracks(&update);
@@ -852,12 +936,17 @@ impl SpircTask {
             }
 
             MessageType::kMessageTypeRepeat => {
-                self.state.set_repeat(update.get_state().get_repeat());
+                let repeat = update.get_state().get_repeat();
+                self.state.set_repeat(repeat);
+
+                self.player.emit_repeat_changed_event(repeat);
+
                 self.notify(None)
             }
 
             MessageType::kMessageTypeShuffle => {
-                self.state.set_shuffle(update.get_state().get_shuffle());
+                let shuffle = update.get_state().get_shuffle();
+                self.state.set_shuffle(shuffle);
                 if self.state.get_shuffle() {
                     let current_index = self.state.get_playing_track_index();
                     let tracks = self.state.mut_track();
@@ -873,6 +962,9 @@ impl SpircTask {
                     let context = self.state.get_context_uri();
                     debug!("{:?}", context);
                 }
+
+                self.player.emit_shuffle_changed_event(shuffle);
+
                 self.notify(None)
             }
 
@@ -882,6 +974,14 @@ impl SpircTask {
             }
 
             MessageType::kMessageTypeReplace => {
+                let context_uri = update.get_state().get_context_uri().to_owned();
+
+                // completely ignore local playback.
+                if context_uri.starts_with("spotify:local-files") {
+                    self.notify(None)?;
+                    return Err(SpircError::UnsupportedLocalPlayBack.into());
+                }
+
                 self.update_tracks(&update);
 
                 if let SpircPlayStatus::Playing {
@@ -915,16 +1015,23 @@ impl SpircTask {
                     && self.device.get_became_active_at()
                         <= update.get_device_state().get_became_active_at()
                 {
-                    self.device.set_is_active(false);
+                    self.handle_disconnect();
-                    self.handle_stop();
                 }
-                Ok(())
+                self.notify(None)
             }
 
             _ => Ok(()),
         }
     }
 
+    fn handle_disconnect(&mut self) {
+        self.device.set_is_active(false);
+        self.handle_stop();
+
+        self.player
+            .emit_session_disconnected_event(self.session.connection_id(), self.session.username());
+    }
+
     fn handle_stop(&mut self) {
         self.player.stop();
     }
@@ -1100,17 +1207,7 @@ impl SpircTask {
         }
 
         if new_index >= tracks_len {
-            let autoplay = self
+            if self.session.autoplay() {
-                .session
-                .get_user_attribute("autoplay")
-                .unwrap_or_else(|| {
-                    warn!(
-                        "Unable to get autoplay user attribute. Continuing with autoplay disabled."
-                    );
-                    "0".into()
-                });
-
-            if autoplay == "1" {
                 // Extend the playlist
                 debug!("Extending playlist <{}>", context_uri);
                 self.update_tracks_from_context();
@@ -1282,13 +1379,11 @@ impl SpircTask {
             || context_uri.starts_with("spotify:dailymix:")
         {
             self.context_fut = self.resolve_station(&context_uri);
-        } else if let Some(autoplay) = self.session.get_user_attribute("autoplay") {
+        } else if self.session.autoplay() {
-            if &autoplay == "1" {
             info!("Fetching autoplay context uri");
             // Get autoplay_station_uri for regular playlists
             self.autoplay_fut = self.resolve_autoplay_uri(&context_uri);
         }
-        }
 
         self.player
             .set_auto_normalise_as_album(context_uri.starts_with("spotify:album:"));
@@ -1422,12 +1517,18 @@ impl SpircTask {
     }
 
     fn set_volume(&mut self, volume: u16) {
-        self.device.set_volume(volume as u32);
+        let old_volume = self.device.get_volume();
+        let new_volume = volume as u32;
+        if old_volume != new_volume {
+            self.device.set_volume(new_volume);
             self.mixer.set_volume(volume);
             if let Some(cache) = self.session.cache() {
                 cache.save_volume(volume)
             }
-        self.player.emit_volume_set_event(volume);
+            if self.device.get_is_active() {
+                self.player.emit_volume_changed_event(volume);
+            }
+        }
     }
 }
 

contrib/event_handler_example.py

@@ -0,0 +1,77 @@
+#!/usr/bin/python3
+import os
+import json
+from datetime import datetime
+
+player_event = os.getenv('PLAYER_EVENT')
+
+json_dict = {
+   'event_time': str(datetime.now()),
+   'event': player_event,
+} 
+
+if player_event in ('session_connected', 'session_disconnected'):
+    json_dict['user_name'] = os.environ['USER_NAME']
+    json_dict['connection_id'] = os.environ['CONNECTION_ID']
+
+elif player_event == 'session_client_changed':
+    json_dict['client_id'] = os.environ['CLIENT_ID']
+    json_dict['client_name'] = os.environ['CLIENT_NAME']
+    json_dict['client_brand_name'] = os.environ['CLIENT_BRAND_NAME']
+    json_dict['client_model_name'] = os.environ['CLIENT_MODEL_NAME']
+
+elif player_event == 'shuffle_changed':
+    json_dict['shuffle'] = os.environ['SHUFFLE']
+
+elif player_event == 'repeat_changed':
+    json_dict['repeat'] = os.environ['REPEAT']
+
+elif player_event == 'auto_play_changed':
+    json_dict['auto_play'] = os.environ['AUTO_PLAY']
+
+elif player_event == 'filter_explicit_content_changed':
+    json_dict['filter'] = os.environ['FILTER']
+
+elif player_event == 'volume_changed':
+    json_dict['volume'] = os.environ['VOLUME']
+
+elif player_event in ('seeked', 'position_correction', 'playing', 'paused'):
+    json_dict['track_id'] = os.environ['TRACK_ID']
+    json_dict['position_ms'] = os.environ['POSITION_MS']
+
+elif player_event in ('unavailable', 'end_of_track', 'preload_next', 'preloading', 'loading', 'stopped'): 
+    json_dict['track_id'] = os.environ['TRACK_ID']
+
+elif player_event == 'track_changed':
+    common_metadata_fields = {}
+    item_type = os.environ['ITEM_TYPE']
+    common_metadata_fields['item_type'] = item_type
+    common_metadata_fields['track_id'] = os.environ['TRACK_ID']
+    common_metadata_fields['uri'] = os.environ['URI']
+    common_metadata_fields['name'] = os.environ['NAME']
+    common_metadata_fields['duration_ms'] = os.environ['DURATION_MS']
+    common_metadata_fields['is_explicit'] = os.environ['IS_EXPLICIT']
+    common_metadata_fields['language'] = os.environ['LANGUAGE'].split('\n')
+    common_metadata_fields['covers'] = os.environ['COVERS'].split('\n')
+    json_dict['common_metadata_fields'] = common_metadata_fields
+    
+
+    if item_type == 'Track':
+        track_metadata_fields = {}
+        track_metadata_fields['number'] = os.environ['NUMBER']
+        track_metadata_fields['disc_number'] = os.environ['DISC_NUMBER']
+        track_metadata_fields['popularity'] = os.environ['POPULARITY']
+        track_metadata_fields['album'] = os.environ['ALBUM']
+        track_metadata_fields['artists'] = os.environ['ARTISTS'].split('\n')
+        track_metadata_fields['album_artists'] = os.environ['ALBUM_ARTISTS'].split('\n')
+        json_dict['track_metadata_fields'] = track_metadata_fields
+
+    elif item_type == 'Episode':
+        episode_metadata_fields = {}
+        episode_metadata_fields['show_name'] = os.environ['SHOW_NAME']
+        publish_time = datetime.utcfromtimestamp(int(os.environ['PUBLISH_TIME'])).strftime('%Y-%m-%d')
+        episode_metadata_fields['publish_time'] = publish_time
+        episode_metadata_fields['description'] = os.environ['DESCRIPTION']
+        json_dict['episode_metadata_fields'] = episode_metadata_fields
+
+print(json.dumps(json_dict, indent = 4))

core/src/authentication.rs

@@ -26,7 +26,7 @@ impl From<AuthenticationError> for Error {
 }
 
 /// The credentials are used to log into the Spotify API.
-#[derive(Debug, Clone, Serialize, Deserialize)]
+#[derive(Debug, Clone, Default, Serialize, Deserialize)]
 pub struct Credentials {
     pub username: String,
 

core/src/session.rs

@@ -73,6 +73,9 @@ pub struct UserData {
 #[derive(Debug, Clone, Default)]
 struct SessionData {
     client_id: String,
+    client_name: String,
+    client_brand_name: String,
+    client_model_name: String,
     connection_id: String,
     time_delta: i64,
     invalid: bool,
@@ -383,6 +386,30 @@ impl Session {
         self.0.data.write().client_id = client_id.to_owned();
     }
 
+    pub fn client_name(&self) -> String {
+        self.0.data.read().client_name.clone()
+    }
+
+    pub fn set_client_name(&self, client_name: &str) {
+        self.0.data.write().client_name = client_name.to_owned();
+    }
+
+    pub fn client_brand_name(&self) -> String {
+        self.0.data.read().client_brand_name.clone()
+    }
+
+    pub fn set_client_brand_name(&self, client_brand_name: &str) {
+        self.0.data.write().client_brand_name = client_brand_name.to_owned();
+    }
+
+    pub fn client_model_name(&self) -> String {
+        self.0.data.read().client_model_name.clone()
+    }
+
+    pub fn set_client_model_name(&self, client_model_name: &str) {
+        self.0.data.write().client_model_name = client_model_name.to_owned();
+    }
+
     pub fn connection_id(&self) -> String {
         self.0.data.read().connection_id.clone()
     }
@@ -403,6 +430,20 @@ impl Session {
         self.0.data.read().user_data.country.clone()
     }
 
+    pub fn filter_explicit_content(&self) -> bool {
+        match self.get_user_attribute("filter-explicit-content") {
+            Some(value) => matches!(&*value, "1"),
+            None => false,
+        }
+    }
+
+    pub fn autoplay(&self) -> bool {
+        match self.get_user_attribute("autoplay") {
+            Some(value) => matches!(&*value, "1"),
+            None => false,
+        }
+    }
+
     pub fn set_user_attribute(&self, key: &str, value: &str) -> Option<String> {
         let mut dummy_attributes = UserAttributes::new();
         dummy_attributes.insert(key.to_owned(), value.to_owned());

examples/play.rs

@@ -36,7 +36,7 @@ async fn main() {
         exit(1);
     }
 
-    let (mut player, _) = Player::new(player_config, session, Box::new(NoOpVolume), move || {
+    let mut player = Player::new(player_config, session, Box::new(NoOpVolume), move || {
         backend(None, audio_format)
     });
 

metadata/src/album.rs

@@ -97,7 +97,7 @@ impl TryFrom<&<Self as Metadata>::Message> for Album {
             date: album.get_date().try_into()?,
             popularity: album.get_popularity(),
             genres: album.get_genre().to_vec(),
-            covers: album.get_cover().into(),
+            covers: album.get_cover_group().into(),
             external_ids: album.get_external_id().into(),
             discs: album.get_disc().try_into()?,
             reviews: album.get_review().to_vec(),

metadata/src/audio/item.rs

@@ -1,11 +1,14 @@
 use std::fmt::Debug;
 
 use crate::{
+    artist::ArtistsWithRole,
     availability::{AudioItemAvailability, Availabilities, UnavailabilityReason},
     episode::Episode,
     error::MetadataError,
+    image::{ImageSize, Images},
     restriction::Restrictions,
     track::{Track, Tracks},
+    Metadata,
 };
 
 use super::file::AudioFiles;
@@ -16,37 +19,199 @@ use librespot_core::{
 
 pub type AudioItemResult = Result<AudioItem, Error>;
 
-// A wrapper with fields the player needs
+#[derive(Debug, Clone)]
+pub struct CoverImage {
+    pub url: String,
+    pub size: ImageSize,
+    pub width: i32,
+    pub height: i32,
+}
+
 #[derive(Debug, Clone)]
 pub struct AudioItem {
-    pub id: SpotifyId,
+    pub track_id: SpotifyId,
-    pub spotify_uri: String,
+    pub uri: String,
     pub files: AudioFiles,
     pub name: String,
-    pub duration: i32,
+    pub covers: Vec<CoverImage>,
+    pub language: Vec<String>,
+    pub duration_ms: u32,
+    pub is_explicit: bool,
     pub availability: AudioItemAvailability,
     pub alternatives: Option<Tracks>,
-    pub is_explicit: bool,
+    pub unique_fields: UniqueFields,
+}
+
+#[derive(Debug, Clone)]
+pub enum UniqueFields {
+    Track {
+        artists: ArtistsWithRole,
+        album: String,
+        album_artists: Vec<String>,
+        popularity: u8,
+        number: u32,
+        disc_number: u32,
+    },
+    Episode {
+        description: String,
+        publish_time: Date,
+        show_name: String,
+    },
 }
 
 impl AudioItem {
     pub async fn get_file(session: &Session, id: SpotifyId) -> AudioItemResult {
+        let image_url = session
+            .get_user_attribute("image-url")
+            .unwrap_or_else(|| String::from("https://i.scdn.co/image/{file_id}"));
+
         match id.item_type {
-            SpotifyItemType::Track => Track::get_audio_item(session, id).await,
+            SpotifyItemType::Track => {
-            SpotifyItemType::Episode => Episode::get_audio_item(session, id).await,
+                let track = Track::get(session, &id).await?;
+
+                if track.duration <= 0 {
+                    return Err(Error::unavailable(MetadataError::InvalidDuration(
+                        track.duration,
+                    )));
+                }
+
+                if track.is_explicit && session.filter_explicit_content() {
+                    return Err(Error::unavailable(MetadataError::ExplicitContentFiltered));
+                }
+
+                let track_id = track.id;
+                let uri = track_id.to_uri()?;
+                let album = track.album.name;
+
+                let album_artists = track
+                    .album
+                    .artists
+                    .0
+                    .into_iter()
+                    .map(|a| a.name)
+                    .collect::<Vec<String>>();
+
+                let covers = get_covers(track.album.covers, image_url);
+
+                let alternatives = if track.alternatives.is_empty() {
+                    None
+                } else {
+                    Some(track.alternatives)
+                };
+
+                let availability = if Date::now_utc() < track.earliest_live_timestamp {
+                    Err(UnavailabilityReason::Embargo)
+                } else {
+                    available_for_user(
+                        &session.user_data(),
+                        &track.availability,
+                        &track.restrictions,
+                    )
+                };
+
+                let popularity = track.popularity.max(0).min(100) as u8;
+                let number = track.number.max(0) as u32;
+                let disc_number = track.disc_number.max(0) as u32;
+
+                let unique_fields = UniqueFields::Track {
+                    artists: track.artists_with_role,
+                    album,
+                    album_artists,
+                    popularity,
+                    number,
+                    disc_number,
+                };
+
+                Ok(Self {
+                    track_id,
+                    uri,
+                    files: track.files,
+                    name: track.name,
+                    covers,
+                    language: track.language_of_performance,
+                    duration_ms: track.duration as u32,
+                    is_explicit: track.is_explicit,
+                    availability,
+                    alternatives,
+                    unique_fields,
+                })
+            }
+            SpotifyItemType::Episode => {
+                let episode = Episode::get(session, &id).await?;
+
+                if episode.duration <= 0 {
+                    return Err(Error::unavailable(MetadataError::InvalidDuration(
+                        episode.duration,
+                    )));
+                }
+
+                if episode.is_explicit && session.filter_explicit_content() {
+                    return Err(Error::unavailable(MetadataError::ExplicitContentFiltered));
+                }
+
+                let track_id = episode.id;
+                let uri = track_id.to_uri()?;
+
+                let covers = get_covers(episode.covers, image_url);
+
+                let availability = available_for_user(
+                    &session.user_data(),
+                    &episode.availability,
+                    &episode.restrictions,
+                );
+
+                let unique_fields = UniqueFields::Episode {
+                    description: episode.description,
+                    publish_time: episode.publish_time,
+                    show_name: episode.show_name,
+                };
+
+                Ok(Self {
+                    track_id,
+                    uri,
+                    files: episode.audio,
+                    name: episode.name,
+                    covers,
+                    language: vec![episode.language],
+                    duration_ms: episode.duration as u32,
+                    is_explicit: episode.is_explicit,
+                    availability,
+                    alternatives: None,
+                    unique_fields,
+                })
+            }
             _ => Err(Error::unavailable(MetadataError::NonPlayable)),
         }
     }
 }
 
-#[async_trait]
+fn get_covers(covers: Images, image_url: String) -> Vec<CoverImage> {
-pub trait InnerAudioItem {
+    let mut covers = covers;
-    async fn get_audio_item(session: &Session, id: SpotifyId) -> AudioItemResult;
 
-    fn allowed_for_user(
+    covers.sort_by(|a, b| b.width.cmp(&a.width));
-        user_data: &UserData,
+
-        restrictions: &Restrictions,
+    covers
-    ) -> AudioItemAvailability {
+        .iter()
+        .filter_map(|cover| {
+            let cover_id = cover.id.to_string();
+
+            if !cover_id.is_empty() {
+                let cover_image = CoverImage {
+                    url: image_url.replace("{file_id}", &cover_id),
+                    size: cover.size,
+                    width: cover.width,
+                    height: cover.height,
+                };
+
+                Some(cover_image)
+            } else {
+                None
+            }
+        })
+        .collect()
+}
+
+fn allowed_for_user(user_data: &UserData, restrictions: &Restrictions) -> AudioItemAvailability {
     let country = &user_data.country;
     let user_catalogue = match user_data.attributes.get("catalogue") {
         Some(catalogue) => catalogue,
@@ -83,9 +248,9 @@ pub trait InnerAudioItem {
     }
 
     Ok(()) // no restrictions in place
-    }
+}
 
-    fn available(availability: &Availabilities) -> AudioItemAvailability {
+fn available(availability: &Availabilities) -> AudioItemAvailability {
     if availability.is_empty() {
         // not all items have availability specified
         return Ok(());
@@ -99,15 +264,14 @@ pub trait InnerAudioItem {
     }
 
     Ok(())
-    }
+}
 
-    fn available_for_user(
+fn available_for_user(
     user_data: &UserData,
     availability: &Availabilities,
     restrictions: &Restrictions,
-    ) -> AudioItemAvailability {
+) -> AudioItemAvailability {
-        Self::available(availability)?;
+    available(availability)?;
-        Self::allowed_for_user(user_data, restrictions)?;
+    allowed_for_user(user_data, restrictions)?;
     Ok(())
-    }
 }

metadata/src/audio/mod.rs

@@ -2,4 +2,4 @@ pub mod file;
 pub mod item;
 
 pub use file::{AudioFileFormat, AudioFiles};
-pub use item::AudioItem;
+pub use item::{AudioItem, UniqueFields};

metadata/src/episode.rs

@@ -5,10 +5,7 @@ use std::{
 };
 
 use crate::{
-    audio::{
+    audio::file::AudioFiles,
-        file::AudioFiles,
-        item::{AudioItem, AudioItemResult, InnerAudioItem},
-    },
     availability::Availabilities,
     content_rating::ContentRatings,
     image::Images,
@@ -36,7 +33,7 @@ pub struct Episode {
     pub covers: Images,
     pub language: String,
     pub is_explicit: bool,
-    pub show: SpotifyId,
+    pub show_name: String,
     pub videos: VideoFiles,
     pub video_previews: VideoFiles,
     pub audio_previews: AudioFiles,
@@ -57,29 +54,6 @@ pub struct Episodes(pub Vec<SpotifyId>);
 
 impl_deref_wrapped!(Episodes, Vec<SpotifyId>);
 
-#[async_trait]
-impl InnerAudioItem for Episode {
-    async fn get_audio_item(session: &Session, id: SpotifyId) -> AudioItemResult {
-        let episode = Self::get(session, &id).await?;
-        let availability = Self::available_for_user(
-            &session.user_data(),
-            &episode.availability,
-            &episode.restrictions,
-        );
-
-        Ok(AudioItem {
-            id,
-            spotify_uri: id.to_uri()?,
-            files: episode.audio,
-            name: episode.name,
-            duration: episode.duration,
-            availability,
-            alternatives: None,
-            is_explicit: episode.is_explicit,
-        })
-    }
-}
-
 #[async_trait]
 impl Metadata for Episode {
     type Message = protocol::metadata::Episode;
@@ -107,7 +81,7 @@ impl TryFrom<&<Self as Metadata>::Message> for Episode {
             covers: episode.get_cover_image().get_image().into(),
             language: episode.get_language().to_owned(),
             is_explicit: episode.get_explicit().to_owned(),
-            show: episode.get_show().try_into()?,
+            show_name: episode.get_show().get_name().to_owned(),
             videos: episode.get_video().into(),
             video_previews: episode.get_video_preview().into(),
             audio_previews: episode.get_audio_preview().into(),

metadata/src/error.rs

@@ -7,4 +7,8 @@ pub enum MetadataError {
     Empty,
     #[error("audio item is non-playable when it should be")]
     NonPlayable,
+    #[error("audio item duration can not be: {0}")]
+    InvalidDuration(i32),
+    #[error("track is marked as explicit, which client setting forbids")]
+    ExplicitContentFiltered,
 }

metadata/src/image.rs

@@ -10,6 +10,7 @@ use librespot_core::{FileId, SpotifyId};
 
 use librespot_protocol as protocol;
 use protocol::metadata::Image as ImageMessage;
+use protocol::metadata::ImageGroup;
 pub use protocol::metadata::Image_Size as ImageSize;
 use protocol::playlist4_external::PictureSize as PictureSizeMessage;
 use protocol::playlist_annotate3::TranscodedPicture as TranscodedPictureMessage;
@@ -25,6 +26,12 @@ pub struct Image {
 #[derive(Debug, Clone, Default)]
 pub struct Images(pub Vec<Image>);
 
+impl From<&ImageGroup> for Images {
+    fn from(image_group: &ImageGroup) -> Self {
+        Self(image_group.image.iter().map(|i| i.into()).collect())
+    }
+}
+
 impl_deref_wrapped!(Images, Vec<Image>);
 
 #[derive(Debug, Clone)]

metadata/src/track.rs

@@ -8,11 +8,8 @@ use uuid::Uuid;
 
 use crate::{
     artist::{Artists, ArtistsWithRole},
-    audio::{
+    audio::file::AudioFiles,
-        file::AudioFiles,
+    availability::Availabilities,
-        item::{AudioItem, AudioItemResult, InnerAudioItem},
-    },
-    availability::{Availabilities, UnavailabilityReason},
     content_rating::ContentRatings,
     external_id::ExternalIds,
     restriction::Restrictions,
@@ -58,42 +55,6 @@ pub struct Tracks(pub Vec<SpotifyId>);
 
 impl_deref_wrapped!(Tracks, Vec<SpotifyId>);
 
-#[async_trait]
-impl InnerAudioItem for Track {
-    async fn get_audio_item(session: &Session, id: SpotifyId) -> AudioItemResult {
-        let track = Self::get(session, &id).await?;
-        let alternatives = {
-            if track.alternatives.is_empty() {
-                None
-            } else {
-                Some(track.alternatives.clone())
-            }
-        };
-
-        // TODO: check meaning of earliest_live_timestamp in
-        let availability = if Date::now_utc() < track.earliest_live_timestamp {
-            Err(UnavailabilityReason::Embargo)
-        } else {
-            Self::available_for_user(
-                &session.user_data(),
-                &track.availability,
-                &track.restrictions,
-            )
-        };
-
-        Ok(AudioItem {
-            id,
-            spotify_uri: id.to_uri()?,
-            files: track.files,
-            name: track.name,
-            duration: track.duration,
-            availability,
-            alternatives,
-            is_explicit: track.is_explicit,
-        })
-    }
-}
-
 #[async_trait]
 impl Metadata for Track {
     type Message = protocol::metadata::Track;

playback/src/audio_backend/alsa.rs

@@ -442,6 +442,7 @@ impl Sink for AlsaSink {
     }
 
     fn stop(&mut self) -> SinkResult<()> {
+        if self.pcm.is_some() {
             // Zero fill the remainder of the period buffer and
             // write any leftover data before draining the actual PCM buffer.
             self.period_buffer.resize(self.period_buffer.capacity(), 0);
@@ -450,6 +451,7 @@ impl Sink for AlsaSink {
             let pcm = self.pcm.take().ok_or(AlsaError::NotConnected)?;
 
             pcm.drain().map_err(AlsaError::DrainFailure)?;
+        }
 
         Ok(())
     }
@@ -489,9 +491,13 @@ impl AlsaSink {
     pub const NAME: &'static str = "alsa";
 
     fn write_buf(&mut self) -> SinkResult<()> {
+        if self.pcm.is_some() {
+            let write_result = {
                 let pcm = self.pcm.as_mut().ok_or(AlsaError::NotConnected)?;
 
-        if let Err(e) = pcm.io_bytes().writei(&self.period_buffer) {
+                match pcm.io_bytes().writei(&self.period_buffer) {
+                    Ok(_) => Ok(()),
+                    Err(e) => {
                         // Capture and log the original error as a warning, and then try to recover.
                         // If recovery fails then forward that error back to player.
                         warn!(
@@ -499,7 +505,15 @@ impl AlsaSink {
                             e
                         );
 
-            pcm.try_recover(e, false).map_err(AlsaError::OnWrite)?
+                        pcm.try_recover(e, false).map_err(AlsaError::OnWrite)
+                    }
+                }
+            };
+
+            if let Err(e) = write_result {
+                self.pcm = None;
+                return Err(e.into());
+            }
         }
 
         self.period_buffer.clear();

playback/src/player.rs

@@ -111,9 +111,26 @@ enum PlayerCommand {
     Seek(u32),
     AddEventSender(mpsc::UnboundedSender<PlayerEvent>),
     SetSinkEventCallback(Option<SinkEventCallback>),
-    EmitVolumeSetEvent(u16),
+    EmitVolumeChangedEvent(u16),
     SetAutoNormaliseAsAlbum(bool),
-    SkipExplicitContent(),
+    EmitSessionDisconnectedEvent {
+        connection_id: String,
+        user_name: String,
+    },
+    EmitSessionConnectedEvent {
+        connection_id: String,
+        user_name: String,
+    },
+    EmitSessionClientChangedEvent {
+        client_id: String,
+        client_name: String,
+        client_brand_name: String,
+        client_model_name: String,
+    },
+    EmitFilterExplicitContentChangedEvent(bool),
+    EmitShuffleChangedEvent(bool),
+    EmitRepeatChangedEvent(bool),
+    EmitAutoPlayChangedEvent(bool),
 }
 
 #[derive(Debug, Clone)]
@@ -123,19 +140,6 @@ pub enum PlayerEvent {
         play_request_id: u64,
         track_id: SpotifyId,
     },
-    // The player started working on playback of a track while it was in a stopped state.
-    // This is always immediately followed up by a "Loading" or "Playing" event.
-    Started {
-        play_request_id: u64,
-        track_id: SpotifyId,
-        position_ms: u32,
-    },
-    // Same as started but in the case that the player already had a track loaded.
-    // The player was either playing the loaded track or it was paused.
-    Changed {
-        old_track_id: SpotifyId,
-        new_track_id: SpotifyId,
-    },
     // The player is delayed by loading a track.
     Loading {
         play_request_id: u64,
@@ -157,14 +161,12 @@ pub enum PlayerEvent {
         play_request_id: u64,
         track_id: SpotifyId,
         position_ms: u32,
-        duration_ms: u32,
     },
     // The player entered a paused state.
     Paused {
         play_request_id: u64,
         track_id: SpotifyId,
         position_ms: u32,
-        duration_ms: u32,
     },
     // The player thinks it's a good idea to issue a preload command for the next track now.
     // This event is intended for use within spirc.
@@ -173,8 +175,7 @@ pub enum PlayerEvent {
         track_id: SpotifyId,
     },
     // The player reached the end of a track.
-    // This event is intended for use within spirc. Spirc will respond by issuing another command
+    // This event is intended for use within spirc. Spirc will respond by issuing another command.
-    // which will trigger another event (e.g. Changed or Stopped)
     EndOfTrack {
         play_request_id: u64,
         track_id: SpotifyId,
@@ -185,9 +186,48 @@ pub enum PlayerEvent {
         track_id: SpotifyId,
     },
     // The mixer volume was set to a new level.
-    VolumeSet {
+    VolumeChanged {
         volume: u16,
     },
+    PositionCorrection {
+        play_request_id: u64,
+        track_id: SpotifyId,
+        position_ms: u32,
+    },
+    Seeked {
+        play_request_id: u64,
+        track_id: SpotifyId,
+        position_ms: u32,
+    },
+    TrackChanged {
+        audio_item: Box<AudioItem>,
+    },
+    SessionConnected {
+        connection_id: String,
+        user_name: String,
+    },
+    SessionDisconnected {
+        connection_id: String,
+        user_name: String,
+    },
+    SessionClientChanged {
+        client_id: String,
+        client_name: String,
+        client_brand_name: String,
+        client_model_name: String,
+    },
+    ShuffleChanged {
+        shuffle: bool,
+    },
+    RepeatChanged {
+        repeat: bool,
+    },
+    AutoPlayChanged {
+        auto_play: bool,
+    },
+    FilterExplicitContentChanged {
+        filter: bool,
+    },
 }
 
 impl PlayerEvent {
@@ -200,9 +240,6 @@ impl PlayerEvent {
             | Unavailable {
                 play_request_id, ..
             }
-            | Started {
-                play_request_id, ..
-            }
             | Playing {
                 play_request_id, ..
             }
@@ -217,8 +254,14 @@ impl PlayerEvent {
             }
             | Stopped {
                 play_request_id, ..
+            }
+            | PositionCorrection {
+                play_request_id, ..
+            }
+            | Seeked {
+                play_request_id, ..
             } => Some(*play_request_id),
-            Changed { .. } | Preloading { .. } | VolumeSet { .. } => None,
+            _ => None,
         }
     }
 }
@@ -370,12 +413,11 @@ impl Player {
         session: Session,
         volume_getter: Box<dyn VolumeGetter + Send>,
         sink_builder: F,
-    ) -> (Player, PlayerEventChannel)
+    ) -> Self
     where
         F: FnOnce() -> Box<dyn Sink> + Send + 'static,
     {
         let (cmd_tx, cmd_rx) = mpsc::unbounded_channel();
-        let (event_sender, event_receiver) = mpsc::unbounded_channel();
 
         if config.normalisation {
             debug!("Normalisation Type: {:?}", config.normalisation_type);
@@ -421,7 +463,7 @@ impl Player {
                 sink_status: SinkStatus::Closed,
                 sink_event_callback: None,
                 volume_getter,
-                event_senders: [event_sender].to_vec(),
+                event_senders: vec![],
                 converter,
 
                 normalisation_peak: 0.0,
@@ -440,14 +482,11 @@ impl Player {
             debug!("PlayerInternal thread finished.");
         });
 
-        (
+        Self {
-            Player {
             commands: Some(cmd_tx),
             thread_handle: Some(handle),
             play_request_id_generator: SeqGenerator::new(0),
-            },
+        }
-            event_receiver,
-        )
     }
 
     fn command(&self, cmd: PlayerCommand) {
@@ -512,16 +551,57 @@ impl Player {
         self.command(PlayerCommand::SetSinkEventCallback(callback));
     }
 
-    pub fn emit_volume_set_event(&self, volume: u16) {
+    pub fn emit_volume_changed_event(&self, volume: u16) {
-        self.command(PlayerCommand::EmitVolumeSetEvent(volume));
+        self.command(PlayerCommand::EmitVolumeChangedEvent(volume));
     }
 
     pub fn set_auto_normalise_as_album(&self, setting: bool) {
         self.command(PlayerCommand::SetAutoNormaliseAsAlbum(setting));
     }
 
-    pub fn skip_explicit_content(&self) {
+    pub fn emit_filter_explicit_content_changed_event(&self, filter: bool) {
-        self.command(PlayerCommand::SkipExplicitContent());
+        self.command(PlayerCommand::EmitFilterExplicitContentChangedEvent(filter));
+    }
+
+    pub fn emit_session_connected_event(&self, connection_id: String, user_name: String) {
+        self.command(PlayerCommand::EmitSessionConnectedEvent {
+            connection_id,
+            user_name,
+        });
+    }
+
+    pub fn emit_session_disconnected_event(&self, connection_id: String, user_name: String) {
+        self.command(PlayerCommand::EmitSessionDisconnectedEvent {
+            connection_id,
+            user_name,
+        });
+    }
+
+    pub fn emit_session_client_changed_event(
+        &self,
+        client_id: String,
+        client_name: String,
+        client_brand_name: String,
+        client_model_name: String,
+    ) {
+        self.command(PlayerCommand::EmitSessionClientChangedEvent {
+            client_id,
+            client_name,
+            client_brand_name,
+            client_model_name,
+        });
+    }
+
+    pub fn emit_shuffle_changed_event(&self, shuffle: bool) {
+        self.command(PlayerCommand::EmitShuffleChangedEvent(shuffle));
+    }
+
+    pub fn emit_repeat_changed_event(&self, repeat: bool) {
+        self.command(PlayerCommand::EmitRepeatChangedEvent(repeat));
+    }
+
+    pub fn emit_auto_play_changed_event(&self, auto_play: bool) {
+        self.command(PlayerCommand::EmitAutoPlayChangedEvent(auto_play));
     }
 }
 
@@ -541,6 +621,7 @@ struct PlayerLoadedTrackData {
     decoder: Decoder,
     normalisation_data: NormalisationData,
     stream_loader_controller: StreamLoaderController,
+    audio_item: AudioItem,
     bytes_per_second: usize,
     duration_ms: u32,
     stream_position_ms: u32,
@@ -573,6 +654,7 @@ enum PlayerState {
         track_id: SpotifyId,
         play_request_id: u64,
         decoder: Decoder,
+        audio_item: AudioItem,
         normalisation_data: NormalisationData,
         normalisation_factor: f64,
         stream_loader_controller: StreamLoaderController,
@@ -587,6 +669,7 @@ enum PlayerState {
         play_request_id: u64,
         decoder: Decoder,
         normalisation_data: NormalisationData,
+        audio_item: AudioItem,
         normalisation_factor: f64,
         stream_loader_controller: StreamLoaderController,
         bytes_per_second: usize,
@@ -660,6 +743,7 @@ impl PlayerState {
                 stream_loader_controller,
                 stream_position_ms,
                 is_explicit,
+                audio_item,
                 ..
             } => {
                 *self = EndOfTrack {
@@ -669,6 +753,7 @@ impl PlayerState {
                         decoder,
                         normalisation_data,
                         stream_loader_controller,
+                        audio_item,
                         bytes_per_second,
                         duration_ms,
                         stream_position_ms,
@@ -694,6 +779,7 @@ impl PlayerState {
                 track_id,
                 play_request_id,
                 decoder,
+                audio_item,
                 normalisation_data,
                 normalisation_factor,
                 stream_loader_controller,
@@ -707,13 +793,15 @@ impl PlayerState {
                     track_id,
                     play_request_id,
                     decoder,
+                    audio_item,
                     normalisation_data,
                     normalisation_factor,
                     stream_loader_controller,
                     duration_ms,
                     bytes_per_second,
                     stream_position_ms,
-                    reported_nominal_start_time: None,
+                    reported_nominal_start_time: Instant::now()
+                        .checked_sub(Duration::from_millis(stream_position_ms as u64)),
                     suggested_to_preload_next_track,
                     is_explicit,
                 };
@@ -736,20 +824,22 @@ impl PlayerState {
                 track_id,
                 play_request_id,
                 decoder,
+                audio_item,
                 normalisation_data,
                 normalisation_factor,
                 stream_loader_controller,
                 duration_ms,
                 bytes_per_second,
                 stream_position_ms,
-                reported_nominal_start_time: _,
                 suggested_to_preload_next_track,
                 is_explicit,
+                ..
             } => {
                 *self = Paused {
                     track_id,
                     play_request_id,
                     decoder,
+                    audio_item,
                     normalisation_data,
                     normalisation_factor,
                     stream_loader_controller,
@@ -777,13 +867,13 @@ struct PlayerTrackLoader {
 }
 
 impl PlayerTrackLoader {
-    async fn find_available_alternative(&self, audio: AudioItem) -> Option<AudioItem> {
+    async fn find_available_alternative(&self, audio_item: AudioItem) -> Option<AudioItem> {
-        if let Err(e) = audio.availability {
+        if let Err(e) = audio_item.availability {
             error!("Track is unavailable: {}", e);
             None
-        } else if !audio.files.is_empty() {
+        } else if !audio_item.files.is_empty() {
-            Some(audio)
+            Some(audio_item)
-        } else if let Some(alternatives) = &audio.alternatives {
+        } else if let Some(alternatives) = &audio_item.alternatives {
             let alternatives: FuturesUnordered<_> = alternatives
                 .iter()
                 .map(|alt_id| AudioItem::get_file(&self.session, *alt_id))
@@ -822,7 +912,7 @@ impl PlayerTrackLoader {
         spotify_id: SpotifyId,
         position_ms: u32,
     ) -> Option<PlayerLoadedTrackData> {
-        let audio = match AudioItem::get_file(&self.session, spotify_id).await {
+        let audio_item = match AudioItem::get_file(&self.session, spotify_id).await {
             Ok(audio) => match self.find_available_alternative(audio).await {
                 Some(audio) => audio,
                 None => {
@@ -841,31 +931,9 @@ impl PlayerTrackLoader {
 
         info!(
             "Loading <{}> with Spotify URI <{}>",
-            audio.name, audio.spotify_uri
+            audio_item.name, audio_item.uri
         );
 
-        let is_explicit = audio.is_explicit;
-
-        if is_explicit {
-            if let Some(value) = self.session.get_user_attribute("filter-explicit-content") {
-                if &value == "1" {
-                    warn!("Track is marked as explicit, which client setting forbids.");
-                    return None;
-                }
-            }
-        }
-
-        if audio.duration < 0 {
-            error!(
-                "Track duration for <{}> cannot be {}",
-                spotify_id.to_uri().unwrap_or_default(),
-                audio.duration
-            );
-            return None;
-        }
-
-        let duration_ms = audio.duration as u32;
-
         // (Most) podcasts seem to support only 96 kbps Ogg Vorbis, so fall back to it
         let formats = match self.config.bitrate {
             Bitrate::Bitrate96 => [
@@ -900,13 +968,16 @@ impl PlayerTrackLoader {
         let (format, file_id) =
             match formats
                 .iter()
-                .find_map(|format| match audio.files.get(format) {
+                .find_map(|format| match audio_item.files.get(format) {
                     Some(&file_id) => Some((*format, file_id)),
                     _ => None,
                 }) {
                 Some(t) => t,
                 None => {
-                    warn!("<{}> is not available in any supported format", audio.name);
+                    warn!(
+                        "<{}> is not available in any supported format",
+                        audio_item.name
+                    );
                     return None;
                 }
             };
@@ -1020,6 +1091,17 @@ impl PlayerTrackLoader {
                 }
             };
 
+            let duration_ms = audio_item.duration_ms;
+            // Don't try to seek past the track's duration.
+            // If the position is invalid just start from
+            // the beginning of the track.
+            let position_ms = if position_ms > duration_ms {
+                warn!("Invalid start position of {}ms exceeds track's duration of {}ms, starting track from the beginning", position_ms, duration_ms);
+                0
+            } else {
+                position_ms
+            };
+
             // Ensure the starting position. Even when we want to play from the beginning,
             // the cursor may have been moved by parsing normalisation data. This may not
             // matter for playback (but won't hurt either), but may be useful for the
@@ -1038,12 +1120,15 @@ impl PlayerTrackLoader {
             // Ensure streaming mode now that we are ready to play from the requested position.
             stream_loader_controller.set_stream_mode();
 
-            info!("<{}> ({} ms) loaded", audio.name, audio.duration);
+            let is_explicit = audio_item.is_explicit;
+
+            info!("<{}> ({} ms) loaded", audio_item.name, duration_ms);
 
             return Some(PlayerLoadedTrackData {
                 decoder,
                 normalisation_data,
                 stream_loader_controller,
+                audio_item,
                 bytes_per_second,
                 duration_ms,
                 stream_position_ms,
@@ -1164,7 +1249,6 @@ impl Future for PlayerInternal {
                     normalisation_factor,
                     ref mut stream_position_ms,
                     ref mut reported_nominal_start_time,
-                    duration_ms,
                     ..
                 } = self.state
                 {
@@ -1226,11 +1310,10 @@ impl Future for PlayerInternal {
                                             if notify_about_position {
                                                 *reported_nominal_start_time =
                                                     now.checked_sub(new_stream_position);
-                                                self.send_event(PlayerEvent::Playing {
+                                                self.send_event(PlayerEvent::PositionCorrection {
-                                                    track_id,
                                                     play_request_id,
+                                                    track_id,
                                                     position_ms: new_stream_position_ms as u32,
-                                                    duration_ms,
                                                 });
                                             }
                                         }
@@ -1315,7 +1398,7 @@ impl PlayerInternal {
                 Ok(()) => self.sink_status = SinkStatus::Running,
                 Err(e) => {
                     error!("{}", e);
-                    exit(1);
+                    self.handle_pause();
                 }
             }
         }
@@ -1396,7 +1479,6 @@ impl PlayerInternal {
             track_id,
             play_request_id,
             stream_position_ms,
-            duration_ms,
             ..
         } = self.state
         {
@@ -1405,7 +1487,6 @@ impl PlayerInternal {
                 track_id,
                 play_request_id,
                 position_ms: stream_position_ms,
-                duration_ms,
             });
             self.ensure_sink_running();
         } else {
@@ -1414,14 +1495,14 @@ impl PlayerInternal {
     }
 
     fn handle_pause(&mut self) {
-        if let PlayerState::Playing {
+        match self.state {
+            PlayerState::Paused { .. } => self.ensure_sink_stopped(false),
+            PlayerState::Playing {
                 track_id,
                 play_request_id,
                 stream_position_ms,
-            duration_ms,
                 ..
-        } = self.state
+            } => {
-        {
                 self.state.playing_to_paused();
 
                 self.ensure_sink_stopped(false);
@@ -1429,10 +1510,9 @@ impl PlayerInternal {
                     track_id,
                     play_request_id,
                     position_ms: stream_position_ms,
-                duration_ms,
                 });
-        } else {
+            }
-            error!("Player::pause called from invalid state: {:?}", self.state);
+            _ => error!("Player::pause called from invalid state: {:?}", self.state),
         }
     }
 
@@ -1555,7 +1635,7 @@ impl PlayerInternal {
 
                     if let Err(e) = self.sink.write(packet, &mut self.converter) {
                         error!("{}", e);
-                        exit(1);
+                        self.handle_pause();
                     }
                 }
             }
@@ -1587,6 +1667,10 @@ impl PlayerInternal {
         loaded_track: PlayerLoadedTrackData,
         start_playback: bool,
     ) {
+        let audio_item = Box::new(loaded_track.audio_item.clone());
+
+        self.send_event(PlayerEvent::TrackChanged { audio_item });
+
         let position_ms = loaded_track.stream_position_ms;
 
         let mut config = self.config.clone();
@@ -1602,18 +1686,17 @@ impl PlayerInternal {
 
         if start_playback {
             self.ensure_sink_running();
-
             self.send_event(PlayerEvent::Playing {
                 track_id,
                 play_request_id,
                 position_ms,
-                duration_ms: loaded_track.duration_ms,
             });
 
             self.state = PlayerState::Playing {
                 track_id,
                 play_request_id,
                 decoder: loaded_track.decoder,
+                audio_item: loaded_track.audio_item,
                 normalisation_data: loaded_track.normalisation_data,
                 normalisation_factor,
                 stream_loader_controller: loaded_track.stream_loader_controller,
@@ -1632,6 +1715,7 @@ impl PlayerInternal {
                 track_id,
                 play_request_id,
                 decoder: loaded_track.decoder,
+                audio_item: loaded_track.audio_item,
                 normalisation_data: loaded_track.normalisation_data,
                 normalisation_factor,
                 stream_loader_controller: loaded_track.stream_loader_controller,
@@ -1646,7 +1730,6 @@ impl PlayerInternal {
                 track_id,
                 play_request_id,
                 position_ms,
-                duration_ms: loaded_track.duration_ms,
             });
         }
     }
@@ -1661,39 +1744,13 @@ impl PlayerInternal {
         if !self.config.gapless {
             self.ensure_sink_stopped(play);
         }
-        // emit the correct player event
+
-        match self.state {
+        if matches!(self.state, PlayerState::Invalid { .. }) {
-            PlayerState::Playing {
-                track_id: old_track_id,
-                ..
-            }
-            | PlayerState::Paused {
-                track_id: old_track_id,
-                ..
-            }
-            | PlayerState::EndOfTrack {
-                track_id: old_track_id,
-                ..
-            }
-            | PlayerState::Loading {
-                track_id: old_track_id,
-                ..
-            } => self.send_event(PlayerEvent::Changed {
-                old_track_id,
-                new_track_id: track_id,
-            }),
-            PlayerState::Stopped => self.send_event(PlayerEvent::Started {
-                track_id,
-                play_request_id,
-                position_ms,
-            }),
-            PlayerState::Invalid { .. } => {
             return Err(Error::internal(format!(
                 "Player::handle_command_load called from invalid state: {:?}",
                 self.state
             )));
         }
-        }
 
         // Now we check at different positions whether we already have a pre-loaded version
         // of this track somewhere. If so, use it and return.
@@ -1754,6 +1811,7 @@ impl PlayerInternal {
                 if let PlayerState::Playing {
                     stream_position_ms,
                     decoder,
+                    audio_item,
                     stream_loader_controller,
                     bytes_per_second,
                     duration_ms,
@@ -1764,6 +1822,7 @@ impl PlayerInternal {
                 | PlayerState::Paused {
                     stream_position_ms,
                     decoder,
+                    audio_item,
                     stream_loader_controller,
                     bytes_per_second,
                     duration_ms,
@@ -1776,6 +1835,7 @@ impl PlayerInternal {
                         decoder,
                         normalisation_data,
                         stream_loader_controller,
+                        audio_item,
                         bytes_per_second,
                         duration_ms,
                         stream_position_ms,
@@ -1925,14 +1985,24 @@ impl PlayerInternal {
                 Ok(new_position_ms) => {
                     if let PlayerState::Playing {
                         ref mut stream_position_ms,
+                        track_id,
+                        play_request_id,
                         ..
                     }
                     | PlayerState::Paused {
                         ref mut stream_position_ms,
+                        track_id,
+                        play_request_id,
                         ..
                     } = self.state
                     {
                         *stream_position_ms = new_position_ms;
+
+                        self.send_event(PlayerEvent::Seeked {
+                            play_request_id,
+                            track_id,
+                            position_ms: new_position_ms,
+                        });
                     }
                 }
                 Err(e) => error!("PlayerInternal::handle_command_seek error: {}", e),
@@ -1945,35 +2015,12 @@ impl PlayerInternal {
         self.preload_data_before_playback()?;
 
         if let PlayerState::Playing {
-            track_id,
-            play_request_id,
             ref mut reported_nominal_start_time,
-            duration_ms,
             ..
         } = self.state
         {
             *reported_nominal_start_time =
                 Instant::now().checked_sub(Duration::from_millis(position_ms as u64));
-            self.send_event(PlayerEvent::Playing {
-                track_id,
-                play_request_id,
-                position_ms,
-                duration_ms,
-            });
-        }
-        if let PlayerState::Paused {
-            track_id,
-            play_request_id,
-            duration_ms,
-            ..
-        } = self.state
-        {
-            self.send_event(PlayerEvent::Paused {
-                track_id,
-                play_request_id,
-                position_ms,
-                duration_ms,
-            });
         }
 
         Ok(())
@@ -2003,15 +2050,58 @@ impl PlayerInternal {
 
             PlayerCommand::SetSinkEventCallback(callback) => self.sink_event_callback = callback,
 
-            PlayerCommand::EmitVolumeSetEvent(volume) => {
+            PlayerCommand::EmitVolumeChangedEvent(volume) => {
-                self.send_event(PlayerEvent::VolumeSet { volume })
+                self.send_event(PlayerEvent::VolumeChanged { volume })
             }
 
+            PlayerCommand::EmitRepeatChangedEvent(repeat) => {
+                self.send_event(PlayerEvent::RepeatChanged { repeat })
+            }
+
+            PlayerCommand::EmitShuffleChangedEvent(shuffle) => {
+                self.send_event(PlayerEvent::ShuffleChanged { shuffle })
+            }
+
+            PlayerCommand::EmitAutoPlayChangedEvent(auto_play) => {
+                self.send_event(PlayerEvent::AutoPlayChanged { auto_play })
+            }
+
+            PlayerCommand::EmitSessionClientChangedEvent {
+                client_id,
+                client_name,
+                client_brand_name,
+                client_model_name,
+            } => self.send_event(PlayerEvent::SessionClientChanged {
+                client_id,
+                client_name,
+                client_brand_name,
+                client_model_name,
+            }),
+
+            PlayerCommand::EmitSessionConnectedEvent {
+                connection_id,
+                user_name,
+            } => self.send_event(PlayerEvent::SessionConnected {
+                connection_id,
+                user_name,
+            }),
+
+            PlayerCommand::EmitSessionDisconnectedEvent {
+                connection_id,
+                user_name,
+            } => self.send_event(PlayerEvent::SessionDisconnected {
+                connection_id,
+                user_name,
+            }),
+
             PlayerCommand::SetAutoNormaliseAsAlbum(setting) => {
                 self.auto_normalise_as_album = setting
             }
 
-            PlayerCommand::SkipExplicitContent() => {
+            PlayerCommand::EmitFilterExplicitContentChangedEvent(filter) => {
+                self.send_event(PlayerEvent::FilterExplicitContentChanged { filter });
+
+                if filter {
                     if let PlayerState::Playing {
                         track_id,
                         play_request_id,
@@ -2034,6 +2124,7 @@ impl PlayerInternal {
                         }
                     }
                 }
+            }
         };
 
         Ok(())
@@ -2133,7 +2224,7 @@ impl Drop for PlayerInternal {
 
 impl fmt::Debug for PlayerCommand {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match *self {
+        match self {
             PlayerCommand::Load {
                 track_id,
                 play,
@@ -2156,14 +2247,58 @@ impl fmt::Debug for PlayerCommand {
             PlayerCommand::SetSinkEventCallback(_) => {
                 f.debug_tuple("SetSinkEventCallback").finish()
             }
-            PlayerCommand::EmitVolumeSetEvent(volume) => {
+            PlayerCommand::EmitVolumeChangedEvent(volume) => f
-                f.debug_tuple("VolumeSet").field(&volume).finish()
+                .debug_tuple("EmitVolumeChangedEvent")
-            }
+                .field(&volume)
+                .finish(),
             PlayerCommand::SetAutoNormaliseAsAlbum(setting) => f
                 .debug_tuple("SetAutoNormaliseAsAlbum")
                 .field(&setting)
                 .finish(),
-            PlayerCommand::SkipExplicitContent() => f.debug_tuple("SkipExplicitContent").finish(),
+            PlayerCommand::EmitFilterExplicitContentChangedEvent(filter) => f
+                .debug_tuple("EmitFilterExplicitContentChangedEvent")
+                .field(&filter)
+                .finish(),
+            PlayerCommand::EmitSessionConnectedEvent {
+                connection_id,
+                user_name,
+            } => f
+                .debug_tuple("EmitSessionConnectedEvent")
+                .field(&connection_id)
+                .field(&user_name)
+                .finish(),
+            PlayerCommand::EmitSessionDisconnectedEvent {
+                connection_id,
+                user_name,
+            } => f
+                .debug_tuple("EmitSessionDisconnectedEvent")
+                .field(&connection_id)
+                .field(&user_name)
+                .finish(),
+            PlayerCommand::EmitSessionClientChangedEvent {
+                client_id,
+                client_name,
+                client_brand_name,
+                client_model_name,
+            } => f
+                .debug_tuple("EmitSessionClientChangedEvent")
+                .field(&client_id)
+                .field(&client_name)
+                .field(&client_brand_name)
+                .field(&client_model_name)
+                .finish(),
+            PlayerCommand::EmitShuffleChangedEvent(shuffle) => f
+                .debug_tuple("EmitShuffleChangedEvent")
+                .field(&shuffle)
+                .finish(),
+            PlayerCommand::EmitRepeatChangedEvent(repeat) => f
+                .debug_tuple("EmitRepeatChangedEvent")
+                .field(&repeat)
+                .finish(),
+            PlayerCommand::EmitAutoPlayChangedEvent(auto_play) => f
+                .debug_tuple("EmitAutoPlayChangedEvent")
+                .field(&auto_play)
+                .finish(),
         }
     }
 }

src/main.rs

@@ -13,7 +13,6 @@ use futures_util::StreamExt;
 use log::{error, info, trace, warn};
 use sha1::{Digest, Sha1};
 use thiserror::Error;
-use tokio::sync::mpsc::UnboundedReceiver;
 use url::Url;
 
 use librespot::{
@@ -29,7 +28,7 @@ use librespot::{
         },
         dither,
         mixer::{self, MixerConfig, MixerFn},
-        player::{coefficient_to_duration, duration_to_coefficient, Player, PlayerEvent},
+        player::{coefficient_to_duration, duration_to_coefficient, Player},
     },
 };
 
@@ -37,7 +36,7 @@ use librespot::{
 use librespot::playback::mixer::alsamixer::AlsaMixer;
 
 mod player_event_handler;
-use player_event_handler::{emit_sink_event, run_program_on_events};
+use player_event_handler::{run_program_on_sink_events, EventHandler};
 
 fn device_id(name: &str) -> String {
     hex::encode(Sha1::digest(name.as_bytes()))
@@ -1598,10 +1597,10 @@ async fn main() {
     let mut last_credentials = None;
     let mut spirc: Option<Spirc> = None;
     let mut spirc_task: Option<Pin<_>> = None;
-    let mut player_event_channel: Option<UnboundedReceiver<PlayerEvent>> = None;
     let mut auto_connect_times: Vec<Instant> = vec![];
     let mut discovery = None;
     let mut connecting = false;
+    let mut _event_handler: Option<EventHandler> = None;
 
     let session = Session::new(setup.session_config.clone(), setup.cache.clone());
 
@@ -1669,32 +1668,21 @@ async fn main() {
                 let format = setup.format;
                 let backend = setup.backend;
                 let device = setup.device.clone();
-                let (player, event_channel) =
+                let player = Player::new(player_config, session.clone(), soft_volume, move || {
-                    Player::new(player_config, session.clone(), soft_volume, move || {
                     (backend)(device, format)
                 });
 
-                if setup.emit_sink_events {
                 if let Some(player_event_program) = setup.player_event_program.clone() {
+                    _event_handler = Some(EventHandler::new(player.get_player_event_channel(), &player_event_program));
+
+                    if setup.emit_sink_events {
                         player.set_sink_event_callback(Some(Box::new(move |sink_status| {
-                            match emit_sink_event(sink_status, &player_event_program) {
+                            run_program_on_sink_events(sink_status, &player_event_program)
-                                Ok(e) if e.success() => (),
-                                Ok(e) => {
-                                    if let Some(code) = e.code() {
-                                        warn!("Sink event program returned exit code {}", code);
-                                    } else {
-                                        warn!("Sink event program returned failure");
-                                    }
-                                },
-                                Err(e) => {
-                                    warn!("Emitting sink event failed: {}", e);
-                                },
-                            }
                         })));
                     }
                 };
 
-                let (spirc_, spirc_task_) = match Spirc::new(connect_config, session.clone(), last_credentials.clone().unwrap(), player, mixer).await {
+                let (spirc_, spirc_task_) = match Spirc::new(connect_config, session.clone(), last_credentials.clone().unwrap_or_default(), player, mixer).await {
                     Ok((spirc_, spirc_task_)) => (spirc_, spirc_task_),
                     Err(e) => {
                         error!("could not initialize spirc: {}", e);
@@ -1703,7 +1691,6 @@ async fn main() {
                 };
                 spirc = Some(spirc_);
                 spirc_task = Some(Box::pin(spirc_task_));
-                player_event_channel = Some(event_channel);
 
                 connecting = false;
             },
@@ -1732,41 +1719,6 @@ async fn main() {
                     },
                 }
             },
-            event = async {
-                match player_event_channel.as_mut() {
-                    Some(p) => p.recv().await,
-                    _ => None
-                }
-            }, if player_event_channel.is_some() => match event {
-                Some(event) => {
-                    if let Some(program) = &setup.player_event_program {
-                        if let Some(child) = run_program_on_events(event, program) {
-                            if let Ok(mut child) = child {
-                                tokio::spawn(async move {
-                                    match child.wait().await {
-                                        Ok(e) if e.success() => (),
-                                        Ok(e) => {
-                                            if let Some(code) = e.code() {
-                                                warn!("On event program returned exit code {}", code);
-                                            } else {
-                                                warn!("On event program returned failure");
-                                            }
-                                        },
-                                        Err(e) => {
-                                            warn!("On event program failed: {}", e);
-                                        },
-                                    }
-                                });
-                            } else {
-                                warn!("On event program failed to start");
-                            }
-                        }
-                    }
-                },
-                None => {
-                    player_event_channel = None;
-                }
-            },
             _ = tokio::signal::ctrl_c() => {
                 break;
             },

src/player_event_handler.rs

@@ -1,61 +1,96 @@
-use log::info;
+use log::{debug, error, warn};
 
-use std::{
+use std::{collections::HashMap, process::Command, thread};
-    collections::HashMap,
+
-    io::{Error, ErrorKind, Result},
+use librespot::{
-    process::{Command, ExitStatus},
+    metadata::audio::UniqueFields,
+    playback::player::{PlayerEvent, PlayerEventChannel, SinkStatus},
 };
 
-use tokio::process::{Child as AsyncChild, Command as AsyncCommand};
+pub struct EventHandler {
+    thread_handle: Option<thread::JoinHandle<()>>,
+}
 
-use librespot::playback::player::{PlayerEvent, SinkStatus};
+impl EventHandler {
-
+    pub fn new(mut player_events: PlayerEventChannel, onevent: &str) -> Self {
-pub fn run_program_on_events(event: PlayerEvent, onevent: &str) -> Option<Result<AsyncChild>> {
+        let on_event = onevent.to_string();
+        let thread_handle = Some(thread::spawn(move || loop {
+            match player_events.blocking_recv() {
+                None => break,
+                Some(event) => {
                     let mut env_vars = HashMap::new();
+
                     match event {
-        PlayerEvent::Changed {
+                        PlayerEvent::TrackChanged { audio_item } => {
-            old_track_id,
+                            match audio_item.track_id.to_base62() {
-            new_track_id,
-        } => match old_track_id.to_base62() {
                                 Err(e) => {
-                return Some(Err(Error::new(
+                                    warn!("PlayerEvent::TrackChanged: Invalid track id: {}", e)
-                    ErrorKind::InvalidData,
-                    format!("PlayerEvent::Changed: Invalid old track id: {}", e),
-                )))
-            }
-            Ok(old_id) => match new_track_id.to_base62() {
-                Err(e) => {
-                    return Some(Err(Error::new(
-                        ErrorKind::InvalidData,
-                        format!("PlayerEvent::Changed: Invalid old track id: {}", e),
-                    )))
-                }
-                Ok(new_id) => {
-                    env_vars.insert("PLAYER_EVENT", "changed".to_string());
-                    env_vars.insert("OLD_TRACK_ID", old_id);
-                    env_vars.insert("TRACK_ID", new_id);
-                }
-            },
-        },
-        PlayerEvent::Started { track_id, .. } => match track_id.to_base62() {
-            Err(e) => {
-                return Some(Err(Error::new(
-                    ErrorKind::InvalidData,
-                    format!("PlayerEvent::Started: Invalid track id: {}", e),
-                )))
                                 }
                                 Ok(id) => {
-                env_vars.insert("PLAYER_EVENT", "started".to_string());
+                                    env_vars.insert("PLAYER_EVENT", "track_changed".to_string());
                                     env_vars.insert("TRACK_ID", id);
+                                    env_vars.insert("URI", audio_item.uri);
+                                    env_vars.insert("NAME", audio_item.name);
+                                    env_vars.insert(
+                                        "COVERS",
+                                        audio_item
+                                            .covers
+                                            .into_iter()
+                                            .map(|c| c.url)
+                                            .collect::<Vec<String>>()
+                                            .join("\n"),
+                                    );
+                                    env_vars.insert("LANGUAGE", audio_item.language.join("\n"));
+                                    env_vars
+                                        .insert("DURATION_MS", audio_item.duration_ms.to_string());
+                                    env_vars
+                                        .insert("IS_EXPLICIT", audio_item.is_explicit.to_string());
+
+                                    match audio_item.unique_fields {
+                                        UniqueFields::Track {
+                                            artists,
+                                            album,
+                                            album_artists,
+                                            popularity,
+                                            number,
+                                            disc_number,
+                                        } => {
+                                            env_vars.insert("ITEM_TYPE", "Track".to_string());
+                                            env_vars.insert(
+                                                "ARTISTS",
+                                                artists
+                                                    .0
+                                                    .into_iter()
+                                                    .map(|a| a.name)
+                                                    .collect::<Vec<String>>()
+                                                    .join("\n"),
+                                            );
+                                            env_vars
+                                                .insert("ALBUM_ARTISTS", album_artists.join("\n"));
+                                            env_vars.insert("ALBUM", album);
+                                            env_vars.insert("POPULARITY", popularity.to_string());
+                                            env_vars.insert("NUMBER", number.to_string());
+                                            env_vars.insert("DISC_NUMBER", disc_number.to_string());
+                                        }
+                                        UniqueFields::Episode {
+                                            description,
+                                            publish_time,
+                                            show_name,
+                                        } => {
+                                            env_vars.insert("ITEM_TYPE", "Episode".to_string());
+                                            env_vars.insert("DESCRIPTION", description);
+                                            env_vars.insert(
+                                                "PUBLISH_TIME",
+                                                publish_time.unix_timestamp().to_string(),
+                                            );
+                                            env_vars.insert("SHOW_NAME", show_name);
+                                        }
+                                    }
+                                }
+                            }
                         }
-        },
                         PlayerEvent::Stopped { track_id, .. } => match track_id.to_base62() {
-            Err(e) => {
+                            Err(e) => warn!("PlayerEvent::Stopped: Invalid track id: {}", e),
-                return Some(Err(Error::new(
-                    ErrorKind::InvalidData,
-                    format!("PlayerEvent::Stopped: Invalid track id: {}", e),
-                )))
-            }
                             Ok(id) => {
                                 env_vars.insert("PLAYER_EVENT", "stopped".to_string());
                                 env_vars.insert("TRACK_ID", id);
@@ -63,86 +98,210 @@ pub fn run_program_on_events(event: PlayerEvent, onevent: &str) -> Option<Result
                         },
                         PlayerEvent::Playing {
                             track_id,
-            duration_ms,
                             position_ms,
                             ..
                         } => match track_id.to_base62() {
-            Err(e) => {
+                            Err(e) => warn!("PlayerEvent::Playing: Invalid track id: {}", e),
-                return Some(Err(Error::new(
-                    ErrorKind::InvalidData,
-                    format!("PlayerEvent::Playing: Invalid track id: {}", e),
-                )))
-            }
                             Ok(id) => {
                                 env_vars.insert("PLAYER_EVENT", "playing".to_string());
                                 env_vars.insert("TRACK_ID", id);
-                env_vars.insert("DURATION_MS", duration_ms.to_string());
                                 env_vars.insert("POSITION_MS", position_ms.to_string());
                             }
                         },
                         PlayerEvent::Paused {
                             track_id,
-            duration_ms,
                             position_ms,
                             ..
                         } => match track_id.to_base62() {
-            Err(e) => {
+                            Err(e) => warn!("PlayerEvent::Paused: Invalid track id: {}", e),
-                return Some(Err(Error::new(
-                    ErrorKind::InvalidData,
-                    format!("PlayerEvent::Paused: Invalid track id: {}", e),
-                )))
-            }
                             Ok(id) => {
                                 env_vars.insert("PLAYER_EVENT", "paused".to_string());
                                 env_vars.insert("TRACK_ID", id);
-                env_vars.insert("DURATION_MS", duration_ms.to_string());
                                 env_vars.insert("POSITION_MS", position_ms.to_string());
                             }
                         },
-        PlayerEvent::Preloading { track_id, .. } => match track_id.to_base62() {
+                        PlayerEvent::Loading { track_id, .. } => match track_id.to_base62() {
-            Err(e) => {
+                            Err(e) => warn!("PlayerEvent::Loading: Invalid track id: {}", e),
-                return Some(Err(Error::new(
+                            Ok(id) => {
-                    ErrorKind::InvalidData,
+                                env_vars.insert("PLAYER_EVENT", "loading".to_string());
-                    format!("PlayerEvent::Preloading: Invalid track id: {}", e),
+                                env_vars.insert("TRACK_ID", id);
-                )))
                             }
+                        },
+                        PlayerEvent::Preloading { track_id, .. } => match track_id.to_base62() {
+                            Err(e) => warn!("PlayerEvent::Preloading: Invalid track id: {}", e),
                             Ok(id) => {
                                 env_vars.insert("PLAYER_EVENT", "preloading".to_string());
                                 env_vars.insert("TRACK_ID", id);
                             }
                         },
-        PlayerEvent::VolumeSet { volume } => {
+                        PlayerEvent::TimeToPreloadNextTrack { track_id, .. } => {
-            env_vars.insert("PLAYER_EVENT", "volume_set".to_string());
+                            match track_id.to_base62() {
+                                Err(e) => warn!(
+                                    "PlayerEvent::TimeToPreloadNextTrack: Invalid track id: {}",
+                                    e
+                                ),
+                                Ok(id) => {
+                                    env_vars.insert("PLAYER_EVENT", "preload_next".to_string());
+                                    env_vars.insert("TRACK_ID", id);
+                                }
+                            }
+                        }
+                        PlayerEvent::EndOfTrack { track_id, .. } => match track_id.to_base62() {
+                            Err(e) => warn!("PlayerEvent::EndOfTrack: Invalid track id: {}", e),
+                            Ok(id) => {
+                                env_vars.insert("PLAYER_EVENT", "end_of_track".to_string());
+                                env_vars.insert("TRACK_ID", id);
+                            }
+                        },
+                        PlayerEvent::Unavailable { track_id, .. } => match track_id.to_base62() {
+                            Err(e) => warn!("PlayerEvent::Unavailable: Invalid track id: {}", e),
+                            Ok(id) => {
+                                env_vars.insert("PLAYER_EVENT", "unavailable".to_string());
+                                env_vars.insert("TRACK_ID", id);
+                            }
+                        },
+                        PlayerEvent::VolumeChanged { volume } => {
+                            env_vars.insert("PLAYER_EVENT", "volume_changed".to_string());
                             env_vars.insert("VOLUME", volume.to_string());
                         }
-        _ => return None,
+                        PlayerEvent::Seeked {
+                            track_id,
+                            position_ms,
+                            ..
+                        } => match track_id.to_base62() {
+                            Err(e) => warn!("PlayerEvent::Seeked: Invalid track id: {}", e),
+                            Ok(id) => {
+                                env_vars.insert("PLAYER_EVENT", "seeked".to_string());
+                                env_vars.insert("TRACK_ID", id);
+                                env_vars.insert("POSITION_MS", position_ms.to_string());
+                            }
+                        },
+                        PlayerEvent::PositionCorrection {
+                            track_id,
+                            position_ms,
+                            ..
+                        } => match track_id.to_base62() {
+                            Err(e) => {
+                                warn!("PlayerEvent::PositionCorrection: Invalid track id: {}", e)
+                            }
+                            Ok(id) => {
+                                env_vars.insert("PLAYER_EVENT", "position_correction".to_string());
+                                env_vars.insert("TRACK_ID", id);
+                                env_vars.insert("POSITION_MS", position_ms.to_string());
+                            }
+                        },
+                        PlayerEvent::SessionConnected {
+                            connection_id,
+                            user_name,
+                        } => {
+                            env_vars.insert("PLAYER_EVENT", "session_connected".to_string());
+                            env_vars.insert("CONNECTION_ID", connection_id);
+                            env_vars.insert("USER_NAME", user_name);
+                        }
+                        PlayerEvent::SessionDisconnected {
+                            connection_id,
+                            user_name,
+                        } => {
+                            env_vars.insert("PLAYER_EVENT", "session_disconnected".to_string());
+                            env_vars.insert("CONNECTION_ID", connection_id);
+                            env_vars.insert("USER_NAME", user_name);
+                        }
+                        PlayerEvent::SessionClientChanged {
+                            client_id,
+                            client_name,
+                            client_brand_name,
+                            client_model_name,
+                        } => {
+                            env_vars.insert("PLAYER_EVENT", "session_client_changed".to_string());
+                            env_vars.insert("CLIENT_ID", client_id);
+                            env_vars.insert("CLIENT_NAME", client_name);
+                            env_vars.insert("CLIENT_BRAND_NAME", client_brand_name);
+                            env_vars.insert("CLIENT_MODEL_NAME", client_model_name);
+                        }
+                        PlayerEvent::ShuffleChanged { shuffle } => {
+                            env_vars.insert("PLAYER_EVENT", "shuffle_changed".to_string());
+                            env_vars.insert("SHUFFLE", shuffle.to_string());
+                        }
+                        PlayerEvent::RepeatChanged { repeat } => {
+                            env_vars.insert("PLAYER_EVENT", "repeat_changed".to_string());
+                            env_vars.insert("REPEAT", repeat.to_string());
+                        }
+                        PlayerEvent::AutoPlayChanged { auto_play } => {
+                            env_vars.insert("PLAYER_EVENT", "auto_play_changed".to_string());
+                            env_vars.insert("AUTO_PLAY", auto_play.to_string());
                         }
 
-    let mut v: Vec<&str> = onevent.split_whitespace().collect();
+                        PlayerEvent::FilterExplicitContentChanged { filter } => {
-    info!("Running {:?} with environment variables {:?}", v, env_vars);
+                            env_vars.insert(
-    Some(
+                                "PLAYER_EVENT",
-        AsyncCommand::new(&v.remove(0))
+                                "filter_explicit_content_changed".to_string(),
-            .args(&v)
+                            );
-            .envs(env_vars.iter())
+                            env_vars.insert("FILTER", filter.to_string());
-            .spawn(),
+                        }
-    )
+                    }
+
+                    if !env_vars.is_empty() {
+                        run_program(env_vars, &on_event);
+                    }
+                }
+            }
+        }));
+
+        Self { thread_handle }
+    }
 }
 
-pub fn emit_sink_event(sink_status: SinkStatus, onevent: &str) -> Result<ExitStatus> {
+impl Drop for EventHandler {
+    fn drop(&mut self) {
+        debug!("Shutting down EventHandler thread ...");
+        if let Some(handle) = self.thread_handle.take() {
+            if let Err(e) = handle.join() {
+                error!("EventHandler thread Error: {:?}", e);
+            }
+        }
+    }
+}
+
+pub fn run_program_on_sink_events(sink_status: SinkStatus, onevent: &str) {
     let mut env_vars = HashMap::new();
+
     env_vars.insert("PLAYER_EVENT", "sink".to_string());
+
     let sink_status = match sink_status {
         SinkStatus::Running => "running",
         SinkStatus::TemporarilyClosed => "temporarily_closed",
         SinkStatus::Closed => "closed",
     };
-    env_vars.insert("SINK_STATUS", sink_status.to_string());
-    let mut v: Vec<&str> = onevent.split_whitespace().collect();
-    info!("Running {:?} with environment variables {:?}", v, env_vars);
 
-    Command::new(&v.remove(0))
+    env_vars.insert("SINK_STATUS", sink_status.to_string());
+
+    run_program(env_vars, onevent);
+}
+
+fn run_program(env_vars: HashMap<&str, String>, onevent: &str) {
+    let mut v: Vec<&str> = onevent.split_whitespace().collect();
+
+    debug!(
+        "Running {} with environment variables:\n{:#?}",
+        onevent, env_vars
+    );
+
+    match Command::new(&v.remove(0))
         .args(&v)
         .envs(env_vars.iter())
-        .spawn()?
+        .spawn()
-        .wait()
+    {
+        Err(e) => warn!("On event program {} failed to start: {}", onevent, e),
+        Ok(mut child) => match child.wait() {
+            Err(e) => warn!("On event program {} failed: {}", onevent, e),
+            Ok(e) if e.success() => (),
+            Ok(e) => {
+                if let Some(code) = e.code() {
+                    warn!("On event program {} returned exit code {}", onevent, code);
+                } else {
+                    warn!("On event program {} returned failure: {}", onevent, e);
+                }
+            }
+        },
+    }
 }