FEATURE_AUDIT_REPORT.md

Musicya Feature Audit Report

Date: January 20, 2026
Status: Complete Application Analysis

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Feature Implementation Summary

Category	Feature	Status	Notes
Core Playback	Play/Pause	✅	Via PlayerController.togglePlayPause()
	Skip Next/Previous	✅	skipToNext(), skipToPrevious()
	Seek	✅	seekTo(position) with progress bar
	Shuffle	✅	Toggle via player controls
	Repeat (Off/All/One)	✅	Cycles through modes
Queue	View Queue	✅	QueueScreen with song list
	Play Next	✅	playNext(song) in LibraryViewModel
	Add to Queue	✅	Single and batch operations
	Remove from Queue	✅	QueueViewModel.removeAt(index)
	Clear Queue	✅	QueueViewModel.clearQueue()
Library	Songs (Paged)	✅	Jetpack Paging 3 for scalability
	Albums	✅	Grid view with navigation to detail
	Artists	✅	List with navigation to songs
	Folders	✅	MediaStore path grouping
	Search	✅	Debounced search across songs/albums/artists
Favorites	Add/Remove Favorites	✅	MusicDao.toggleFavorite()
	Favorites Screen	✅	Dedicated FavoritesScreen
Playlists	Create Playlist	✅	createPlaylist(name)
	Add Songs to Playlist	✅	Single and batch add
	Playlist Detail	✅	PlaylistDetailScreen
	Delete Playlist	✅	Via MusicDao
	Rename Playlist	✅	renamePlaylist()
Play History	Record Play	✅	MusicDao.recordPlay()
	Recently Played	✅	RecentlyPlayedScreen
	Most Played	✅	MostPlayedScreen
	Never Played	✅	NeverPlayedScreen
Player Features	Sleep Timer	✅	SleepTimerManager
	Playback Speed	✅	PlaybackSpeedManager (0.25x-3.0x)
	Crossfade Setting	✅	SettingsPreferences (UI only)
Audio Effects	Equalizer	✅	AudioEngine with bands
	Bass Boost	✅	setBassLevel()
	Virtualizer	✅	setVirtualizerLevel()
	Loudness Enhancer	✅	setLoudness()
	Presets	✅	Standard EQ presets
Settings	Theme (Light/Dark/System)	✅	SettingsPreferences.themeMode
	Crossfade Duration	✅	Configurable 0-12 seconds
	Equalizer Access	✅	Navigation to EQ screen
UI Features	Selection Mode	✅	Multi-select with actions
	Song Details Dialog	✅	Path, size, duration display
	Delete Songs	✅	MediaStore deletion
	Lyrics Display	✅	LRC parsing, synced display
Database	Favorites Persistence	✅	Room with proper migrations
	Playlist Persistence	✅	With foreign key constraints
	Play History Tracking	✅	Indexed for performance

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Screen Inventory

Screen	Route	ViewModel	Status
Songs	songs	LibraryViewModel	✅
Albums	albums	LibraryViewModel	✅
Artists	artists	LibraryViewModel	✅
Folders	folders	LibraryViewModel	✅
Favorites	favorites	FavoritesViewModel	✅
Playlists	playlists	PlaylistsViewModel	✅
Recently Played	recently_played	RecentlyPlayedViewModel	✅
Most Played	most_played	MostPlayedViewModel	✅
Never Played	never_played	NeverPlayedViewModel	✅
Now Playing	now_playing	NowPlayingViewModel	✅
Queue	queue	QueueViewModel	✅
Search	search	SearchViewModel	✅
Settings	settings	SettingsViewModel	✅
Equalizer	equalizer	-	✅
Playlist Detail	playlist/{type}/{id}	PlaylistDetailViewModel	✅

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Architecture Components

Layer	Component	Implementation
Data	MusicRepository	MediaStore queries, caching, paging
	MusicDao	Favorites, playlists, play history
	SettingsPreferences	DataStore for theme/crossfade
Player	PlayerController	Media3 MediaController wrapper
	SleepTimerManager	Timer with coroutine countdown
	PlaybackSpeedManager	Speed control with presets
	AudioEngine	Equalizer, bass, virtualizer
	MusicService	Media3 MediaLibraryService
DI	DatabaseModule	Room with migrations v1→v2→v3
	RepositoryModule	Interface bindings
UI	Neo-Brutalism Design	NeoDimens, Color, Type tokens

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Previously Potential Improvements - Now Implemented

Priority	Area	Status
✅	Crossfade	CrossfadeManager.kt - Volume-based fade-out/fade-in
✅	Gapless	Already enabled via pauseAtEndOfMediaItems = false
✅	Widget	Enhanced with Play/Pause, Next, Prev, Favorite
✅	Notification	Using DefaultMediaNotificationProvider

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Audit Summary

Overall Status: ✅ All Core Features Implemented

The Musicya app has a complete feature set for a production music player:

• Full playback control with queue management
• Comprehensive library browsing (songs, albums, artists, folders)
• Favorites and playlist management with persistence
• Play history tracking with three viewing modes
• Advanced player features (sleep timer, speed control, EQ)
• Modern UI with Neo-Brutalism design system
• Performance optimizations (paging, indexed queries, image caching)

No missing features identified.