refactor: conditionally show lyrics settings only when embed lyrics is enabled

fix(deps): update go dependencies

.github/workflows/pages.yml

@@ -22,13 +22,13 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Setup Pages
         uses: actions/configure-pages@v5
 
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v3
+        uses: actions/upload-pages-artifact@v4
         with:
           path: site
 

CHANGELOG.md

@@ -1,5 +1,59 @@
 # Changelog
 
+## [3.6.9] - 2026-02-17
+
+### Added
+
+- **YouTube Bitrate Presets**: YouTube bitrate selection now uses supported presets only
+  - Opus: 128 / 256 kbps
+  - MP3: 128 / 256 / 320 kbps
+- **Go Test Coverage for YouTube Quality Parsing**: Added tests for supported-bitrate normalization behavior
+- **Localization for YouTube Bitrate UI**: Added localized strings (EN/ID) for YouTube bitrate titles and labels
+
+### Fixed
+
+- **Cover Image Cache Clear Not Working**: Clearing "Cover image cache" now performs a full on-disk wipe, clears in-memory image cache, and reinitializes cache manager state
+  - Prevents stale/orphaned cache files from keeping the same storage usage after clear
+- **YouTube Queue Fallback Quality Mismatch**: Queue fallback now normalizes YouTube quality IDs so conversion paths use valid bitrate format IDs
+
+### Changed
+
+- **Default Lyrics Behavior**: `Apple/QQ Multi-Person Word-by-Word` is now OFF by default for new installs
+- **Removed Dynamic YouTube Bitrate Mode**: Arbitrary values are now normalized to nearest supported Spotube preset across settings, picker, queue fallback, and Go backend parser
+- **Lyrics Embedding Control**: Users can now disable the embedded-lyrics process from settings (`Embed Lyrics` off)
+
+---
+
+## [3.6.8] - 2026-02-14
+
+### Added
+
+- **Lyrics Source Tracking**: Track Metadata screen now displays the source of loaded lyrics (LRCLIB, Musixmatch, Netease, Apple Music, QQ Music, Embedded, or Extension)
+  - New `getLyricsLRCWithSource` API returns lyrics with source metadata
+  - Source badge appears below lyrics section in Track Metadata screen
+- **Dedicated Lyrics Provider Priority Page**: Lyrics providers can now be configured from a dedicated settings page with full-screen reorderable list
+  - Replaced inline bottom sheet with `LyricsProviderPriorityPage`
+  - Cleaner UI with provider descriptions and priority ordering
+- **Paxsenix Integration**: Added Paxsenix API as official lyrics proxy partner for Apple Music, QQ Music, Musixmatch, and Netease sources
+  - Listed in About page and Partners page on project site
+  - README updated with partner attribution
+
+### Fixed
+
+- **LRC Background Vocal Preservation**: Apple Music/QQ Music `[bg:...]` background vocal tags are now preserved during LRC parsing instead of being stripped
+  - Background vocals attach to the previous timed line in exported LRC files
+- **LRC Display Improvements**:
+  - Inline word-by-word timestamps (`<mm:ss.xx>`) are stripped from lyrics display
+  - Speaker prefixes (`v1:`, `v2:`) are removed for cleaner display
+  - Multi-line background vocals converted to readable secondary vocal lines
+- **Apple Music Lyrics Case Sensitivity**: Fixed `lyricsType` comparison to use case-insensitive matching for "Syllable" type
+
+### Changed
+
+- Track Metadata lyrics fetching now uses `getLyricsLRCWithSource` for consistent source attribution across embedded and online lyrics
+
+---
+
 ## [3.6.7] - 2026-02-13
 
 ### Added
@@ -16,6 +70,20 @@
 - Project website with GitHub Pages deployment workflow
   - Mobile burger menu navigation for all site pages
 - Go filename template test suite
+- "Lyrics Provider" extension type - extensions can now provide lyrics (synced or plain text) via `fetchLyrics()` function
+  - Lyrics provider extensions are called before built-in providers, giving extensions highest priority
+  - New `lyrics_provider` manifest type alongside `metadata_provider` and `download_provider`
+  - Shows "Lyrics Provider" capability badge on extension detail page
+- "Lyrics Providers" settings - configurable provider cascade order and per-provider options
+  - Reorderable provider list: LRCLIB, Musixmatch, Netease, Apple Music, QQ Music
+  - Netease: toggle translated/romanized lyrics appending
+  - Apple Music / QQ Music: multi-person word-by-word speaker tags
+  - Musixmatch: selectable language code for localized lyrics
+- "Documentation Search" - global search modal on all site pages
+  - Opens with Ctrl+K / Cmd+K / `/` keyboard shortcuts on every page
+  - Search button with bordered pill styling in desktop nav and mobile hamburger menu
+  - On non-docs pages, search results navigate to the docs page at the matching section
+  - Full keyboard navigation: arrow keys, Enter to select, Esc to close
 
 ### Fixed
 

README.md

@@ -97,7 +97,7 @@ The software is provided "as is", without warranty of any kind. The author assum
 - **Tidal**: [hifi-api](https://github.com/binimum/hifi-api), [music.binimum.org](https://music.binimum.org), [qqdl.site](https://qqdl.site), [squid.wtf](https://squid.wtf), [spotisaver.net](https://spotisaver.net)
 - **Qobuz**: [dabmusic.xyz](https://dabmusic.xyz), [squid.wtf](https://squid.wtf), [jumo-dl](https://jumo-dl.pages.dev)
 - **Amazon**: [AfkarXYZ](https://github.com/afkarxyz)
-- **Lyrics**: [LRCLib](https://lrclib.net)
+- **Lyrics**: [LRCLib](https://lrclib.net), [Paxsenix](https://lyrics.paxsenix.org) (Apple Music/QQ Music lyrics proxy)
 - **YouTube Audio**: [Cobalt](https://cobalt.tools) via [qwkuns.me](https://qwkuns.me), [SpotubeDL](https://spotubedl.com)
 - **Track Linking**: [SongLink / Odesli](https://odesli.co), [IDHS](https://github.com/sjdonado/idonthavespotify)
 

android/app/src/main/kotlin/com/zarz/spotiflac/MainActivity.kt

@@ -1582,6 +1582,32 @@ class MainActivity: FlutterFragmentActivity() {
                             }
                             result.success(response)
                         }
+                        "getLyricsLRCWithSource" -> {
+                            val spotifyId = call.argument<String>("spotify_id") ?: ""
+                            val trackName = call.argument<String>("track_name") ?: ""
+                            val artistName = call.argument<String>("artist_name") ?: ""
+                            val filePath = call.argument<String>("file_path") ?: ""
+                            val durationMs = call.argument<Int>("duration_ms")?.toLong() ?: 0L
+                            val response = withContext(Dispatchers.IO) {
+                                if (filePath.startsWith("content://")) {
+                                    val tempPath = copyUriToTemp(Uri.parse(filePath))
+                                    if (tempPath == null) {
+                                        """{"lyrics":"","source":"","sync_type":"","instrumental":false}"""
+                                    } else {
+                                        try {
+                                            Gobackend.getLyricsLRCWithSource(spotifyId, trackName, artistName, tempPath, durationMs)
+                                        } finally {
+                                            try {
+                                                File(tempPath).delete()
+                                            } catch (_: Exception) {}
+                                        }
+                                    }
+                                } else {
+                                    Gobackend.getLyricsLRCWithSource(spotifyId, trackName, artistName, filePath, durationMs)
+                                }
+                            }
+                            result.success(response)
+                        }
                         "embedLyricsToFile" -> {
                             val filePath = call.argument<String>("file_path") ?: ""
                             val lyrics = call.argument<String>("lyrics") ?: ""
@@ -1756,6 +1782,60 @@ class MainActivity: FlutterFragmentActivity() {
                             }
                             result.success(response)
                         }
+                        "setLyricsProviders" -> {
+                            val providersJson = call.argument<String>("providers_json") ?: "[]"
+                            val response = withContext(Dispatchers.IO) {
+                                try {
+                                    Gobackend.setLyricsProvidersJSON(providersJson)
+                                    """{"success":true}"""
+                                } catch (e: Exception) {
+                                    """{"success":false,"error":"${e.message?.replace("\"", "'")}"}"""
+                                }
+                            }
+                            result.success(response)
+                        }
+                        "getLyricsProviders" -> {
+                            val response = withContext(Dispatchers.IO) {
+                                try {
+                                    Gobackend.getLyricsProvidersJSON()
+                                } catch (e: Exception) {
+                                    "[]"
+                                }
+                            }
+                            result.success(response)
+                        }
+                        "getAvailableLyricsProviders" -> {
+                            val response = withContext(Dispatchers.IO) {
+                                try {
+                                    Gobackend.getAvailableLyricsProvidersJSON()
+                                } catch (e: Exception) {
+                                    "[]"
+                                }
+                            }
+                            result.success(response)
+                        }
+                        "setLyricsFetchOptions" -> {
+                            val optionsJson = call.argument<String>("options_json") ?: "{}"
+                            val response = withContext(Dispatchers.IO) {
+                                try {
+                                    Gobackend.setLyricsFetchOptionsJSON(optionsJson)
+                                    """{"success":true}"""
+                                } catch (e: Exception) {
+                                    """{"success":false,"error":"${e.message?.replace("\"", "'")}"}"""
+                                }
+                            }
+                            result.success(response)
+                        }
+                        "getLyricsFetchOptions" -> {
+                            val response = withContext(Dispatchers.IO) {
+                                try {
+                                    Gobackend.getLyricsFetchOptionsJSON()
+                                } catch (e: Exception) {
+                                    "{}"
+                                }
+                            }
+                            result.success(response)
+                        }
                         "reEnrichFile" -> {
                             val requestJson = call.argument<String>("request_json") ?: "{}"
                             val response = withContext(Dispatchers.IO) {

android/app/src/main/res/values/colors.xml

@@ -1,4 +1,4 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-    <color name="ic_launcher_background">#1a1a2e</color>
+    <color name="ic_launcher_background">#000000</color>
 </resources>

go_backend/exports.go

@@ -1008,6 +1008,64 @@ func GetLyricsLRC(spotifyID, trackName, artistName string, filePath string, dura
 	return lrcContent, nil
 }
 
+func GetLyricsLRCWithSource(spotifyID, trackName, artistName string, filePath string, durationMs int64) (string, error) {
+	if filePath != "" {
+		lyrics, err := ExtractLyrics(filePath)
+		if err == nil && lyrics != "" {
+			result := map[string]interface{}{
+				"lyrics":       lyrics,
+				"source":       "Embedded",
+				"sync_type":    "EMBEDDED",
+				"instrumental": false,
+			}
+			jsonBytes, err := json.Marshal(result)
+			if err != nil {
+				return "", err
+			}
+			return string(jsonBytes), nil
+		}
+
+		result := map[string]interface{}{
+			"lyrics":       "",
+			"source":       "",
+			"sync_type":    "",
+			"instrumental": false,
+		}
+		jsonBytes, err := json.Marshal(result)
+		if err != nil {
+			return "", err
+		}
+		return string(jsonBytes), nil
+	}
+
+	client := NewLyricsClient()
+	durationSec := float64(durationMs) / 1000.0
+	lyricsData, err := client.FetchLyricsAllSources(spotifyID, trackName, artistName, durationSec)
+	if err != nil {
+		return "", err
+	}
+
+	lrcContent := ""
+	if lyricsData.Instrumental {
+		lrcContent = "[instrumental:true]"
+	} else {
+		lrcContent = convertToLRCWithMetadata(lyricsData, trackName, artistName)
+	}
+
+	result := map[string]interface{}{
+		"lyrics":       lrcContent,
+		"source":       lyricsData.Source,
+		"sync_type":    lyricsData.SyncType,
+		"instrumental": lyricsData.Instrumental,
+	}
+	jsonBytes, err := json.Marshal(result)
+	if err != nil {
+		return "", err
+	}
+
+	return string(jsonBytes), nil
+}
+
 func EmbedLyricsToFile(filePath, lyrics string) (string, error) {
 	err := EmbedLyrics(filePath, lyrics)
 	if err != nil {
@@ -1463,7 +1521,7 @@ func errorResponse(msg string) (string, error) {
 // ==================== YOUTUBE PROVIDER (LOSSY ONLY) ====================
 
 // DownloadFromYouTube downloads a track from YouTube via Cobalt API
-// This is a lossy-only provider (Opus 256kbps or MP3 320kbps)
+// This is a lossy-only provider (Opus/MP3 with configurable bitrate)
 // It does NOT participate in the lossless fallback chain
 func DownloadFromYouTube(requestJSON string) (string, error) {
 	var req DownloadRequest
@@ -1599,6 +1657,62 @@ func FetchAndSaveLyrics(trackName, artistName, spotifyID string, durationMs int6
 	return nil
 }
 
+// ==================== LYRICS PROVIDER SETTINGS ====================
+
+// SetLyricsProvidersJSON sets the lyrics provider order from a JSON array of provider IDs.
+func SetLyricsProvidersJSON(providersJSON string) error {
+	var providers []string
+	if err := json.Unmarshal([]byte(providersJSON), &providers); err != nil {
+		return err
+	}
+
+	SetLyricsProviderOrder(providers)
+	return nil
+}
+
+// GetLyricsProvidersJSON returns the current lyrics provider order as JSON.
+func GetLyricsProvidersJSON() (string, error) {
+	providers := GetLyricsProviderOrder()
+	jsonBytes, err := json.Marshal(providers)
+	if err != nil {
+		return "", err
+	}
+	return string(jsonBytes), nil
+}
+
+// GetAvailableLyricsProvidersJSON returns metadata about all available lyrics providers.
+func GetAvailableLyricsProvidersJSON() (string, error) {
+	providers := GetAvailableLyricsProviders()
+	jsonBytes, err := json.Marshal(providers)
+	if err != nil {
+		return "", err
+	}
+	return string(jsonBytes), nil
+}
+
+// SetLyricsFetchOptionsJSON sets lyrics provider fetch options.
+func SetLyricsFetchOptionsJSON(optionsJSON string) error {
+	opts := GetLyricsFetchOptions()
+	if strings.TrimSpace(optionsJSON) != "" {
+		if err := json.Unmarshal([]byte(optionsJSON), &opts); err != nil {
+			return err
+		}
+	}
+
+	SetLyricsFetchOptions(opts)
+	return nil
+}
+
+// GetLyricsFetchOptionsJSON returns current lyrics provider fetch options.
+func GetLyricsFetchOptionsJSON() (string, error) {
+	opts := GetLyricsFetchOptions()
+	jsonBytes, err := json.Marshal(opts)
+	if err != nil {
+		return "", err
+	}
+	return string(jsonBytes), nil
+}
+
 // ReEnrichFile re-embeds metadata, cover art, and lyrics into an existing audio file.
 // When search_online is true, searches Spotify/Deezer by track name + artist to fetch
 // complete metadata from the internet before embedding.

go_backend/extension_manager.go

@@ -713,6 +713,7 @@ func (m *ExtensionManager) GetInstalledExtensionsJSON() (string, error) {
 		Permissions            []string               `json:"permissions"`
 		HasMetadataProvider    bool                   `json:"has_metadata_provider"`
 		HasDownloadProvider    bool                   `json:"has_download_provider"`
+		HasLyricsProvider      bool                   `json:"has_lyrics_provider"`
 		SkipMetadataEnrichment bool                   `json:"skip_metadata_enrichment"`
 		SearchBehavior         *SearchBehaviorConfig  `json:"search_behavior,omitempty"`
 		TrackMatching          *TrackMatchingConfig   `json:"track_matching,omitempty"`
@@ -770,6 +771,7 @@ func (m *ExtensionManager) GetInstalledExtensionsJSON() (string, error) {
 			Permissions:            permissions,
 			HasMetadataProvider:    ext.Manifest.IsMetadataProvider(),
 			HasDownloadProvider:    ext.Manifest.IsDownloadProvider(),
+			HasLyricsProvider:      ext.Manifest.IsLyricsProvider(),
 			SkipMetadataEnrichment: ext.Manifest.SkipMetadataEnrichment,
 			SearchBehavior:         ext.Manifest.SearchBehavior,
 			TrackMatching:          ext.Manifest.TrackMatching,

go_backend/extension_manifest.go

@@ -12,6 +12,7 @@ type ExtensionType string
 const (
 	ExtensionTypeMetadataProvider ExtensionType = "metadata_provider"
 	ExtensionTypeDownloadProvider ExtensionType = "download_provider"
+	ExtensionTypeLyricsProvider   ExtensionType = "lyrics_provider"
 )
 
 type SettingType string
@@ -167,10 +168,10 @@ func (m *ExtensionManifest) Validate() error {
 	}
 
 	for _, t := range m.Types {
-		if t != ExtensionTypeMetadataProvider && t != ExtensionTypeDownloadProvider {
+		if t != ExtensionTypeMetadataProvider && t != ExtensionTypeDownloadProvider && t != ExtensionTypeLyricsProvider {
 			return &ManifestValidationError{
 				Field:   "type",
-				Message: fmt.Sprintf("invalid extension type: %s (must be 'metadata_provider' or 'download_provider')", t),
+				Message: fmt.Sprintf("invalid extension type: %s (must be 'metadata_provider', 'download_provider', or 'lyrics_provider')", t),
 			}
 		}
 	}
@@ -226,6 +227,10 @@ func (m *ExtensionManifest) IsDownloadProvider() bool {
 	return m.HasType(ExtensionTypeDownloadProvider)
 }
 
+func (m *ExtensionManifest) IsLyricsProvider() bool {
+	return m.HasType(ExtensionTypeLyricsProvider)
+}
+
 func (m *ExtensionManifest) IsDomainAllowed(domain string) bool {
 	domain = strings.ToLower(strings.TrimSpace(domain))
 	for _, allowed := range m.Permissions.Network {

go_backend/extension_providers.go

@@ -7,6 +7,7 @@ import (
 	"errors"
 	"fmt"
 	"path/filepath"
+	"sort"
 	"strings"
 	"sync"
 	"time"
@@ -1699,3 +1700,140 @@ func (m *ExtensionManager) RunPostProcessingV2(input PostProcessInput, metadata
 
 	return &PostProcessResult{Success: true, NewFilePath: currentInput.Path, NewFileURI: currentInput.URI}, nil
 }
+
+// ==================== Lyrics Provider ====================
+
+// ExtLyricsResult represents lyrics data returned from an extension
+type ExtLyricsResult struct {
+	Lines        []ExtLyricsLine `json:"lines"`
+	SyncType     string          `json:"syncType"`
+	Instrumental bool            `json:"instrumental"`
+	PlainLyrics  string          `json:"plainLyrics"`
+	Provider     string          `json:"provider"`
+}
+
+type ExtLyricsLine struct {
+	StartTimeMs int64  `json:"startTimeMs"`
+	Words       string `json:"words"`
+	EndTimeMs   int64  `json:"endTimeMs"`
+}
+
+// FetchLyrics calls the extension's fetchLyrics function
+func (p *ExtensionProviderWrapper) FetchLyrics(trackName, artistName, albumName string, durationSec float64) (*LyricsResponse, error) {
+	if !p.extension.Manifest.IsLyricsProvider() {
+		return nil, fmt.Errorf("extension '%s' is not a lyrics provider", p.extension.ID)
+	}
+
+	if !p.extension.Enabled {
+		return nil, fmt.Errorf("extension '%s' is disabled", p.extension.ID)
+	}
+
+	p.extension.VMMu.Lock()
+	defer p.extension.VMMu.Unlock()
+
+	// Use global variables to avoid JS injection issues with special characters in track/artist names
+	const trackVar = "__sf_lyrics_track"
+	const artistVar = "__sf_lyrics_artist"
+	const albumVar = "__sf_lyrics_album"
+	const durationVar = "__sf_lyrics_duration"
+	global := p.vm.GlobalObject()
+	_ = global.Set(trackVar, trackName)
+	_ = global.Set(artistVar, artistName)
+	_ = global.Set(albumVar, albumName)
+	_ = global.Set(durationVar, durationSec)
+	defer func() {
+		global.Delete(trackVar)
+		global.Delete(artistVar)
+		global.Delete(albumVar)
+		global.Delete(durationVar)
+	}()
+
+	const script = `
+		(function() {
+			if (typeof extension !== 'undefined' && typeof extension.fetchLyrics === 'function') {
+				return extension.fetchLyrics(__sf_lyrics_track, __sf_lyrics_artist, __sf_lyrics_album, __sf_lyrics_duration);
+			}
+			return null;
+		})()
+	`
+
+	result, err := RunWithTimeoutAndRecover(p.vm, script, DefaultJSTimeout)
+	if err != nil {
+		if IsTimeoutError(err) {
+			return nil, fmt.Errorf("fetchLyrics timeout: extension took too long to respond")
+		}
+		return nil, fmt.Errorf("fetchLyrics failed: %w", err)
+	}
+
+	if result == nil || goja.IsUndefined(result) || goja.IsNull(result) {
+		return nil, fmt.Errorf("fetchLyrics returned null")
+	}
+
+	exported := result.Export()
+	jsonBytes, err := json.Marshal(exported)
+	if err != nil {
+		return nil, fmt.Errorf("failed to marshal lyrics result: %w", err)
+	}
+
+	var extResult ExtLyricsResult
+	if err := json.Unmarshal(jsonBytes, &extResult); err != nil {
+		return nil, fmt.Errorf("failed to parse lyrics result: %w", err)
+	}
+
+	// Convert ExtLyricsResult to LyricsResponse
+	response := &LyricsResponse{
+		SyncType:     extResult.SyncType,
+		Instrumental: extResult.Instrumental,
+		PlainLyrics:  extResult.PlainLyrics,
+		Provider:     extResult.Provider,
+		Source:       "Extension: " + p.extension.ID,
+	}
+
+	if response.Provider == "" {
+		response.Provider = p.extension.Manifest.DisplayName
+	}
+
+	for _, line := range extResult.Lines {
+		response.Lines = append(response.Lines, LyricsLine{
+			StartTimeMs: line.StartTimeMs,
+			Words:       line.Words,
+			EndTimeMs:   line.EndTimeMs,
+		})
+	}
+
+	// If the extension provided plainLyrics but no lines, parse them as unsynced
+	if len(response.Lines) == 0 && response.PlainLyrics != "" && !response.Instrumental {
+		response.SyncType = "UNSYNCED"
+		for _, line := range strings.Split(response.PlainLyrics, "\n") {
+			if strings.TrimSpace(line) != "" {
+				response.Lines = append(response.Lines, LyricsLine{
+					StartTimeMs: 0,
+					Words:       line,
+					EndTimeMs:   0,
+				})
+			}
+		}
+	}
+
+	return response, nil
+}
+
+// GetLyricsProviders returns all enabled extensions that provide lyrics
+func (m *ExtensionManager) GetLyricsProviders() []*ExtensionProviderWrapper {
+	m.mu.RLock()
+	defer m.mu.RUnlock()
+
+	var providers []*ExtensionProviderWrapper
+	for _, ext := range m.extensions {
+		if ext.Enabled && ext.Manifest.IsLyricsProvider() && ext.Error == "" {
+			providers = append(providers, NewExtensionProviderWrapper(ext))
+		}
+	}
+
+	// Keep a deterministic order so provider selection is stable across runs.
+	sort.Slice(providers, func(i, j int) bool {
+		return providers[i].extension.ID < providers[j].extension.ID
+	})
+
+	return providers
+}

go_backend/go.mod

@@ -5,12 +5,12 @@ go 1.25.0
 toolchain go1.26.0
 
 require (
-	github.com/dop251/goja v0.0.0-20260106131823-651366fbe6e3
+	github.com/dop251/goja v0.0.0-20260216154549-8b74ce4618c5
 	github.com/go-flac/flacpicture/v2 v2.0.2
 	github.com/go-flac/flacvorbis/v2 v2.0.2
 	github.com/go-flac/go-flac/v2 v2.0.4
 	github.com/refraction-networking/utls v1.8.2
-	golang.org/x/mobile v0.0.0-20260209203831-923679eb55af
+	golang.org/x/mobile v0.0.0-20260211191516-dcd2a3258864
 	golang.org/x/net v0.50.0
 )
 

go_backend/go.sum

@@ -8,6 +8,8 @@ github.com/dlclark/regexp2 v1.11.4 h1:rPYF9/LECdNymJufQKmri9gV604RvvABwgOA8un7yA
 github.com/dlclark/regexp2 v1.11.4/go.mod h1:DHkYz0B9wPfa6wondMfaivmHpzrQ3v9q8cnmRbL6yW8=
 github.com/dop251/goja v0.0.0-20260106131823-651366fbe6e3 h1:bVp3yUzvSAJzu9GqID+Z96P+eu5TKnIMJSV4QaZMauM=
 github.com/dop251/goja v0.0.0-20260106131823-651366fbe6e3/go.mod h1:MxLav0peU43GgvwVgNbLAj1s/bSGboKkhuULvq/7hx4=
+github.com/dop251/goja v0.0.0-20260216154549-8b74ce4618c5 h1:QckvTXtu55YMopmVeDrPQ/r+T6xjw8KMCmE3UgUldkw=
+github.com/dop251/goja v0.0.0-20260216154549-8b74ce4618c5/go.mod h1:MxLav0peU43GgvwVgNbLAj1s/bSGboKkhuULvq/7hx4=
 github.com/go-flac/flacpicture/v2 v2.0.2 h1:HCaJIVZpxnpdWs6G3ECEVRelzqS5xOi1Ba1AGmtXbzE=
 github.com/go-flac/flacpicture/v2 v2.0.2/go.mod h1:DMZBPWPAmdLqNhqFSy5ZBs9wyBzOekXutGfP7/TFCuo=
 github.com/go-flac/flacvorbis/v2 v2.0.2 h1:xCL3OhxrxWkHrbWUBvGNe+6FQ03yLmBbz0v5z4V2PoQ=
@@ -36,6 +38,8 @@ golang.org/x/mobile v0.0.0-20260204172633-1dceadbbeea3 h1:NiJtT7g4ncNFVjVZMAYNBr
 golang.org/x/mobile v0.0.0-20260204172633-1dceadbbeea3/go.mod h1:wReH3Q1agKmmLapipWFnd4NSs8KPz3fK6mSEZjXLkrg=
 golang.org/x/mobile v0.0.0-20260209203831-923679eb55af h1:VqXrZNyqFISxo0rNDFZQlRDRIp7RXSJDeh/LbrK+W1k=
 golang.org/x/mobile v0.0.0-20260209203831-923679eb55af/go.mod h1:tbwefIr7RlQD1OpZ0KEZ9nux/uiihAOGdafgZfJkmII=
+golang.org/x/mobile v0.0.0-20260211191516-dcd2a3258864 h1:cTVynMSsMYgbUrtia2HB1jrhdUwQNtQti91vUCyjMp4=
+golang.org/x/mobile v0.0.0-20260211191516-dcd2a3258864/go.mod h1:4OGHIUSBiIqyFAQDaX1tpY0BVnO20DvNDeATBu8aeFQ=
 golang.org/x/mod v0.32.0 h1:9F4d3PHLljb6x//jOyokMv3eX+YDeepZSEo3mFJy93c=
 golang.org/x/mod v0.32.0/go.mod h1:SgipZ/3h2Ci89DlEtEXWUk/HteuRin+HHhN+WbNhguU=
 golang.org/x/mod v0.33.0 h1:tHFzIWbBifEmbwtGz65eaWyGiGZatSrT9prnU8DbVL8=

go_backend/lyrics.go

@@ -20,6 +20,140 @@ const (
 	durationToleranceSec = 10.0
 )
 
+// Lyrics provider names (used in settings and cascade ordering)
+const (
+	LyricsProviderLRCLIB     = "lrclib"
+	LyricsProviderNetease    = "netease"
+	LyricsProviderMusixmatch = "musixmatch"
+	LyricsProviderAppleMusic = "apple_music"
+	LyricsProviderQQMusic    = "qqmusic"
+)
+
+// DefaultLyricsProviders is the default cascade order for lyrics fetching.
+// LRCLIB first (no proxy dependency), then the others.
+var DefaultLyricsProviders = []string{
+	LyricsProviderLRCLIB,
+	LyricsProviderMusixmatch,
+	LyricsProviderNetease,
+	LyricsProviderAppleMusic,
+	LyricsProviderQQMusic,
+}
+
+// Global lyrics provider configuration
+var (
+	lyricsProvidersMu sync.RWMutex
+	lyricsProviders   []string // ordered list of enabled providers
+)
+
+// LyricsFetchOptions controls optional provider-specific enhancements.
+type LyricsFetchOptions struct {
+	IncludeTranslationNetease  bool   `json:"include_translation_netease"`
+	IncludeRomanizationNetease bool   `json:"include_romanization_netease"`
+	MultiPersonWordByWord      bool   `json:"multi_person_word_by_word"`
+	MusixmatchLanguage         string `json:"musixmatch_language,omitempty"`
+}
+
+var defaultLyricsFetchOptions = LyricsFetchOptions{
+	IncludeTranslationNetease:  false,
+	IncludeRomanizationNetease: false,
+	MultiPersonWordByWord:      true,
+	MusixmatchLanguage:         "",
+}
+
+var (
+	lyricsFetchOptionsMu sync.RWMutex
+	lyricsFetchOptions   = defaultLyricsFetchOptions
+)
+
+// SetLyricsProviderOrder sets the ordered list of lyrics providers to try.
+// Providers not in the list are disabled. An empty list resets to defaults.
+func SetLyricsProviderOrder(providers []string) {
+	lyricsProvidersMu.Lock()
+	defer lyricsProvidersMu.Unlock()
+
+	if len(providers) == 0 {
+		lyricsProviders = nil
+		return
+	}
+
+	// Validate provider names
+	validNames := map[string]bool{
+		LyricsProviderLRCLIB:     true,
+		LyricsProviderNetease:    true,
+		LyricsProviderMusixmatch: true,
+		LyricsProviderAppleMusic: true,
+		LyricsProviderQQMusic:    true,
+	}
+
+	var valid []string
+	for _, p := range providers {
+		normalized := strings.ToLower(strings.TrimSpace(p))
+		if validNames[normalized] {
+			valid = append(valid, normalized)
+		}
+	}
+
+	lyricsProviders = valid
+	GoLog("[Lyrics] Provider order set to: %v\n", valid)
+}
+
+// GetLyricsProviderOrder returns the current lyrics provider order.
+func GetLyricsProviderOrder() []string {
+	lyricsProvidersMu.RLock()
+	defer lyricsProvidersMu.RUnlock()
+
+	if len(lyricsProviders) == 0 {
+		return DefaultLyricsProviders
+	}
+
+	result := make([]string, len(lyricsProviders))
+	copy(result, lyricsProviders)
+	return result
+}
+
+// GetAvailableLyricsProviders returns metadata about all available providers.
+func GetAvailableLyricsProviders() []map[string]interface{} {
+	return []map[string]interface{}{
+		{"id": LyricsProviderLRCLIB, "name": "LRCLIB", "has_proxy_dependency": false, "description": "Open-source synced lyrics database"},
+		{"id": LyricsProviderNetease, "name": "Netease", "has_proxy_dependency": false, "description": "NetEase Cloud Music (good for Asian songs)"},
+		{"id": LyricsProviderMusixmatch, "name": "Musixmatch", "has_proxy_dependency": true, "description": "Largest lyrics database (multi-language)"},
+		{"id": LyricsProviderAppleMusic, "name": "Apple Music", "has_proxy_dependency": true, "description": "Word-by-word synced lyrics"},
+		{"id": LyricsProviderQQMusic, "name": "QQ Music", "has_proxy_dependency": true, "description": "QQ Music lyrics (good for Chinese songs)"},
+	}
+}
+
+func normalizeLyricsFetchOptions(opts LyricsFetchOptions) LyricsFetchOptions {
+	opts.MusixmatchLanguage = strings.ToLower(strings.TrimSpace(opts.MusixmatchLanguage))
+	opts.MusixmatchLanguage = regexp.MustCompile(`[^a-z0-9\-_]`).ReplaceAllString(opts.MusixmatchLanguage, "")
+	if len(opts.MusixmatchLanguage) > 16 {
+		opts.MusixmatchLanguage = opts.MusixmatchLanguage[:16]
+	}
+	return opts
+}
+
+// SetLyricsFetchOptions sets provider-specific lyric fetch behavior.
+func SetLyricsFetchOptions(opts LyricsFetchOptions) {
+	normalized := normalizeLyricsFetchOptions(opts)
+
+	lyricsFetchOptionsMu.Lock()
+	defer lyricsFetchOptionsMu.Unlock()
+	lyricsFetchOptions = normalized
+
+	GoLog("[Lyrics] Fetch options set: translation=%v romanization=%v multi_person=%v musixmatch_lang=%q\n",
+		normalized.IncludeTranslationNetease,
+		normalized.IncludeRomanizationNetease,
+		normalized.MultiPersonWordByWord,
+		normalized.MusixmatchLanguage,
+	)
+}
+
+// GetLyricsFetchOptions returns current provider-specific lyric fetch behavior.
+func GetLyricsFetchOptions() LyricsFetchOptions {
+	lyricsFetchOptionsMu.RLock()
+	defer lyricsFetchOptionsMu.RUnlock()
+	return lyricsFetchOptions
+}
+
 type lyricsCacheEntry struct {
 	response  *LyricsResponse
 	expiresAt time.Time
@@ -90,6 +224,15 @@ func (c *lyricsCache) Size() int {
 	return len(c.cache)
 }
 
+func (c *lyricsCache) ClearAll() int {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+
+	cleared := len(c.cache)
+	c.cache = make(map[string]*lyricsCacheEntry)
+	return cleared
+}
+
 type LRCLibResponse struct {
 	ID           int     `json:"id"`
 	Name         string  `json:"name"`
@@ -139,7 +282,7 @@ func (c *LyricsClient) FetchLyricsWithMetadata(artist, track string) (*LyricsRes
 	if err != nil {
 		return nil, fmt.Errorf("failed to create request: %w", err)
 	}
-	req.Header.Set("User-Agent", "SpotiFLAC-Android/1.0")
+	req.Header.Set("User-Agent", getRandomUserAgent())
 
 	resp, err := c.httpClient.Do(req)
 	if err != nil {
@@ -174,7 +317,7 @@ func (c *LyricsClient) FetchLyricsFromLRCLibSearch(query string, durationSec flo
 	if err != nil {
 		return nil, fmt.Errorf("failed to create request: %w", err)
 	}
-	req.Header.Set("User-Agent", "SpotiFLAC-Android/1.0")
+	req.Header.Set("User-Agent", getRandomUserAgent())
 
 	resp, err := c.httpClient.Do(req)
 	if err != nil {
@@ -240,68 +383,203 @@ func (c *LyricsClient) durationMatches(lrcDuration, targetDuration float64) bool
 
 func (c *LyricsClient) FetchLyricsAllSources(spotifyID, trackName, artistName string, durationSec float64) (*LyricsResponse, error) {
 	primaryArtist := normalizeArtistName(artistName)
+	fetchOptions := GetLyricsFetchOptions()
 
+	extManager := GetExtensionManager()
+	var extensionProviders []*ExtensionProviderWrapper
+	if extManager != nil {
+		extensionProviders = extManager.GetLyricsProviders()
+	}
+
+	var cachedNonExtension *LyricsResponse
 	if cached, found := globalLyricsCache.Get(artistName, trackName, durationSec); found {
-		fmt.Printf("[Lyrics] Cache hit for: %s - %s\n", artistName, trackName)
-		cachedCopy := *cached
-		cachedCopy.Source = cached.Source + " (cached)"
+		isExtensionCache := strings.HasPrefix(cached.Source, "Extension:")
+		if len(extensionProviders) == 0 || isExtensionCache {
+			fmt.Printf("[Lyrics] Cache hit for: %s - %s\n", artistName, trackName)
+			cachedCopy := *cached
+			cachedCopy.Source = cached.Source + " (cached)"
+			return &cachedCopy, nil
+		}
+
+		// If extension providers are currently enabled, don't let stale built-in cache
+		// mask newly installed/activated extensions.
+		cachedNonExtension = cached
+		GoLog("[Lyrics] Ignoring cached non-extension lyrics because extension providers are available\n")
+	}
+
+	isValidResult := func(l *LyricsResponse) bool {
+		return lyricsHasUsableText(l)
+	}
+
+	// Try extension lyrics providers first
+	if len(extensionProviders) > 0 {
+		for _, provider := range extensionProviders {
+			GoLog("[Lyrics] Trying extension lyrics provider: %s\n", provider.extension.ID)
+			lyrics, err := provider.FetchLyrics(trackName, artistName, "", durationSec)
+			if err == nil && isValidResult(lyrics) {
+				GoLog("[Lyrics] Got lyrics from extension: %s\n", provider.extension.ID)
+				globalLyricsCache.Set(artistName, trackName, durationSec, lyrics)
+				return lyrics, nil
+			}
+			if err != nil {
+				GoLog("[Lyrics] Extension %s failed: %v\n", provider.extension.ID, err)
+			}
+		}
+	}
+
+	if cachedNonExtension != nil {
+		cachedCopy := *cachedNonExtension
+		cachedCopy.Source = cachedNonExtension.Source + " (cached fallback)"
+		GoLog("[Lyrics] Extension providers unavailable for this track, using cached built-in lyrics\n")
 		return &cachedCopy, nil
 	}
 
-	var lyrics *LyricsResponse
-	var err error
-
-	isValidResult := func(l *LyricsResponse) bool {
-		return l != nil && (len(l.Lines) > 0 || l.Instrumental)
-	}
-
-	lyrics, err = c.FetchLyricsWithMetadata(primaryArtist, trackName)
-	if err == nil && isValidResult(lyrics) {
-		lyrics.Source = "LRCLIB"
-		globalLyricsCache.Set(artistName, trackName, durationSec, lyrics)
-		return lyrics, nil
-	}
-
-	if primaryArtist != artistName {
-		lyrics, err = c.FetchLyricsWithMetadata(artistName, trackName)
-		if err == nil && isValidResult(lyrics) {
-			lyrics.Source = "LRCLIB"
-			globalLyricsCache.Set(artistName, trackName, durationSec, lyrics)
-			return lyrics, nil
-		}
-	}
-
+	// Get configured provider order
+	providerOrder := GetLyricsProviderOrder()
 	simplifiedTrack := simplifyTrackName(trackName)
-	if simplifiedTrack != trackName {
-		lyrics, err = c.FetchLyricsWithMetadata(primaryArtist, simplifiedTrack)
+
+	GoLog("[Lyrics] Searching for: %s - %s (providers: %v)\n", artistName, trackName, providerOrder)
+
+	// Cascade through all configured built-in providers
+	for _, providerName := range providerOrder {
+		GoLog("[Lyrics] Trying provider: %s\n", providerName)
+
+		var lyrics *LyricsResponse
+		var err error
+
+		switch providerName {
+		case LyricsProviderLRCLIB:
+			lyrics, err = c.tryLRCLIB(primaryArtist, artistName, trackName, simplifiedTrack, durationSec)
+
+		case LyricsProviderNetease:
+			neteaseClient := NewNeteaseClient()
+			lyrics, err = neteaseClient.FetchLyrics(
+				trackName,
+				primaryArtist,
+				durationSec,
+				fetchOptions.IncludeTranslationNetease,
+				fetchOptions.IncludeRomanizationNetease,
+			)
+			if err != nil && primaryArtist != artistName {
+				lyrics, err = neteaseClient.FetchLyrics(
+					trackName,
+					artistName,
+					durationSec,
+					fetchOptions.IncludeTranslationNetease,
+					fetchOptions.IncludeRomanizationNetease,
+				)
+			}
+			if err != nil && simplifiedTrack != trackName {
+				lyrics, err = neteaseClient.FetchLyrics(
+					simplifiedTrack,
+					primaryArtist,
+					durationSec,
+					fetchOptions.IncludeTranslationNetease,
+					fetchOptions.IncludeRomanizationNetease,
+				)
+			}
+
+		case LyricsProviderMusixmatch:
+			musixmatchClient := NewMusixmatchClient()
+			lyrics, err = musixmatchClient.FetchLyrics(
+				trackName,
+				primaryArtist,
+				durationSec,
+				fetchOptions.MusixmatchLanguage,
+			)
+			if err != nil && primaryArtist != artistName {
+				lyrics, err = musixmatchClient.FetchLyrics(
+					trackName,
+					artistName,
+					durationSec,
+					fetchOptions.MusixmatchLanguage,
+				)
+			}
+
+		case LyricsProviderAppleMusic:
+			appleClient := NewAppleMusicClient()
+			lyrics, err = appleClient.FetchLyrics(trackName, primaryArtist, durationSec, fetchOptions.MultiPersonWordByWord)
+			if err != nil && primaryArtist != artistName {
+				lyrics, err = appleClient.FetchLyrics(trackName, artistName, durationSec, fetchOptions.MultiPersonWordByWord)
+			}
+
+		case LyricsProviderQQMusic:
+			qqClient := NewQQMusicClient()
+			lyrics, err = qqClient.FetchLyrics(trackName, primaryArtist, durationSec, fetchOptions.MultiPersonWordByWord)
+			if err != nil && primaryArtist != artistName {
+				lyrics, err = qqClient.FetchLyrics(trackName, artistName, durationSec, fetchOptions.MultiPersonWordByWord)
+			}
+
+		default:
+			GoLog("[Lyrics] Unknown provider: %s, skipping\n", providerName)
+			continue
+		}
+
 		if err == nil && isValidResult(lyrics) {
-			lyrics.Source = "LRCLIB (simplified)"
+			GoLog("[Lyrics] Got lyrics from: %s\n", providerName)
 			globalLyricsCache.Set(artistName, trackName, durationSec, lyrics)
 			return lyrics, nil
 		}
-	}
 
-	query := primaryArtist + " " + trackName
-	lyrics, err = c.FetchLyricsFromLRCLibSearch(query, durationSec)
-	if err == nil && isValidResult(lyrics) {
-		lyrics.Source = "LRCLIB Search"
-		globalLyricsCache.Set(artistName, trackName, durationSec, lyrics)
-		return lyrics, nil
-	}
-
-	if simplifiedTrack != trackName {
-		query = primaryArtist + " " + simplifiedTrack
-		lyrics, err = c.FetchLyricsFromLRCLibSearch(query, durationSec)
-		if err == nil && isValidResult(lyrics) {
-			lyrics.Source = "LRCLIB Search (simplified)"
-			globalLyricsCache.Set(artistName, trackName, durationSec, lyrics)
-			return lyrics, nil
+		if err != nil {
+			GoLog("[Lyrics] Provider %s failed: %v\n", providerName, err)
 		}
 	}
 
 	return nil, fmt.Errorf("lyrics not found from any source")
 }
 
+// tryLRCLIB attempts all LRCLIB search strategies (exact match, simplified, search).
+func (c *LyricsClient) tryLRCLIB(primaryArtist, artistName, trackName, simplifiedTrack string, durationSec float64) (*LyricsResponse, error) {
+	var lyrics *LyricsResponse
+	var err error
+
+	// 1. Exact match with primary artist
+	lyrics, err = c.FetchLyricsWithMetadata(primaryArtist, trackName)
+	if err == nil && lyrics != nil && (len(lyrics.Lines) > 0 || lyrics.Instrumental) {
+		lyrics.Source = "LRCLIB"
+		return lyrics, nil
+	}
+
+	// 2. Exact match with full artist name
+	if primaryArtist != artistName {
+		lyrics, err = c.FetchLyricsWithMetadata(artistName, trackName)
+		if err == nil && lyrics != nil && (len(lyrics.Lines) > 0 || lyrics.Instrumental) {
+			lyrics.Source = "LRCLIB"
+			return lyrics, nil
+		}
+	}
+
+	// 3. Simplified track name
+	if simplifiedTrack != trackName {
+		lyrics, err = c.FetchLyricsWithMetadata(primaryArtist, simplifiedTrack)
+		if err == nil && lyrics != nil && (len(lyrics.Lines) > 0 || lyrics.Instrumental) {
+			lyrics.Source = "LRCLIB (simplified)"
+			return lyrics, nil
+		}
+	}
+
+	// 4. Search by query
+	query := primaryArtist + " " + trackName
+	lyrics, err = c.FetchLyricsFromLRCLibSearch(query, durationSec)
+	if err == nil && lyrics != nil && (len(lyrics.Lines) > 0 || lyrics.Instrumental) {
+		lyrics.Source = "LRCLIB Search"
+		return lyrics, nil
+	}
+
+	// 5. Search with simplified track name
+	if simplifiedTrack != trackName {
+		query = primaryArtist + " " + simplifiedTrack
+		lyrics, err = c.FetchLyricsFromLRCLibSearch(query, durationSec)
+		if err == nil && lyrics != nil && (len(lyrics.Lines) > 0 || lyrics.Instrumental) {
+			lyrics.Source = "LRCLIB Search (simplified)"
+			return lyrics, nil
+		}
+	}
+
+	return nil, fmt.Errorf("LRCLIB: no lyrics found")
+}
+
 func (c *LyricsClient) parseLRCLibResponse(resp *LRCLibResponse) *LyricsResponse {
 	result := &LyricsResponse{
 		Instrumental: resp.Instrumental,
@@ -339,10 +617,20 @@ func parseSyncedLyrics(syncedLyrics string) []LyricsLine {
 			continue
 		}
 
+		// Preserve Apple/QQ background vocal tags by attaching them to
+		// the previous timed line. This keeps [bg:...] in final exported LRC.
+		if strings.HasPrefix(line, "[bg:") && len(lines) > 0 {
+			lines[len(lines)-1].Words = strings.TrimSpace(lines[len(lines)-1].Words + "\n" + line)
+			continue
+		}
+
 		matches := lrcPattern.FindStringSubmatch(line)
 		if len(matches) == 5 {
 			startMs := lrcTimestampToMs(matches[1], matches[2], matches[3])
 			words := strings.TrimSpace(matches[4])
+			if words == "" {
+				continue
+			}
 
 			lines = append(lines, LyricsLine{
 				StartTimeMs: startMs,
@@ -363,6 +651,63 @@ func parseSyncedLyrics(syncedLyrics string) []LyricsLine {
 	return lines
 }
 
+func lyricsHasUsableText(lyrics *LyricsResponse) bool {
+	if lyrics == nil {
+		return false
+	}
+	if lyrics.Instrumental {
+		return true
+	}
+	if strings.TrimSpace(lyrics.PlainLyrics) != "" {
+		return true
+	}
+	for _, line := range lyrics.Lines {
+		if strings.TrimSpace(line.Words) != "" {
+			return true
+		}
+	}
+	return false
+}
+
+// detectLyricsErrorPayload extracts human-readable error messages from
+// JSON payloads returned by lyrics proxies when no lyric is available.
+func detectLyricsErrorPayload(raw string) (string, bool) {
+	trimmed := strings.TrimSpace(raw)
+	if trimmed == "" || !strings.HasPrefix(trimmed, "{") {
+		return "", false
+	}
+
+	var payload map[string]interface{}
+	if err := json.Unmarshal([]byte(trimmed), &payload); err != nil {
+		return "", false
+	}
+
+	lyricsKeys := []string{"lyrics", "lyric", "lrc", "content", "lines", "syncedLyrics", "unsyncedLyrics"}
+	hasLyricsKey := false
+	for _, key := range lyricsKeys {
+		if _, ok := payload[key]; ok {
+			hasLyricsKey = true
+			break
+		}
+	}
+
+	errorKeys := []string{"message", "error", "detail", "reason"}
+	for _, key := range errorKeys {
+		if msg, ok := payload[key].(string); ok {
+			msg = strings.TrimSpace(msg)
+			if msg != "" && !hasLyricsKey {
+				return msg, true
+			}
+		}
+	}
+
+	if success, ok := payload["success"].(bool); ok && !success && !hasLyricsKey {
+		return "request unsuccessful", true
+	}
+
+	return "", false
+}
+
 func lrcTimestampToMs(minutes, seconds, centiseconds string) int64 {
 	min, _ := strconv.ParseInt(minutes, 10, 64)
 	sec, _ := strconv.ParseInt(seconds, 10, 64)
@@ -376,12 +721,16 @@ func lrcTimestampToMs(minutes, seconds, centiseconds string) int64 {
 }
 
 func msToLRCTimestamp(ms int64) string {
+	return fmt.Sprintf("[%s]", msToLRCTimestampInline(ms))
+}
+
+func msToLRCTimestampInline(ms int64) string {
 	totalSeconds := ms / 1000
 	minutes := totalSeconds / 60
 	seconds := totalSeconds % 60
 	centiseconds := (ms % 1000) / 10
 
-	return fmt.Sprintf("[%02d:%02d.%02d]", minutes, seconds, centiseconds)
+	return fmt.Sprintf("%02d:%02d.%02d", minutes, seconds, centiseconds)
 }
 
 func convertToLRCWithMetadata(lyrics *LyricsResponse, trackName, artistName string) string {
@@ -441,8 +790,18 @@ func simplifyTrackName(name string) string {
 		re := regexp.MustCompile("(?i)" + pattern)
 		result = re.ReplaceAllString(result, "")
 	}
+	result = strings.TrimSpace(result)
+	if result == "" {
+		return result
+	}
 
-	return strings.TrimSpace(result)
+	// Add a loose fallback form for provider queries where punctuation
+	// and separators differ (e.g. "/" vs "_" vs spaces).
+	if loose := normalizeLooseTitle(result); loose != "" {
+		return loose
+	}
+
+	return result
 }
 
 func normalizeArtistName(name string) string {

go_backend/lyrics_apple.go

@@ -0,0 +1,381 @@
+package gobackend
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"regexp"
+	"strings"
+	"sync"
+	"time"
+)
+
+// AppleMusicClient fetches lyrics from Apple Music.
+// Uses a scraped JWT token for search and a proxy for lyrics.
+type AppleMusicClient struct {
+	httpClient *http.Client
+}
+
+// Apple Music token manager — singleton with mutex for thread safety
+type appleTokenManager struct {
+	mu    sync.Mutex
+	token string
+}
+
+var globalAppleTokenManager = &appleTokenManager{}
+
+func (m *appleTokenManager) getToken(client *http.Client) (string, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+
+	if m.token != "" {
+		return m.token, nil
+	}
+
+	// Step 1: Fetch the Apple Music beta page
+	req, err := http.NewRequest("GET", "https://beta.music.apple.com", nil)
+	if err != nil {
+		return "", fmt.Errorf("failed to create request: %w", err)
+	}
+	req.Header.Set("User-Agent", getRandomUserAgent())
+
+	resp, err := client.Do(req)
+	if err != nil {
+		return "", fmt.Errorf("failed to fetch Apple Music page: %w", err)
+	}
+	defer resp.Body.Close()
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return "", fmt.Errorf("failed to read Apple Music page: %w", err)
+	}
+
+	// Step 2: Find the index JS file URL
+	indexJsRegex := regexp.MustCompile(`/assets/index~[^/]+\.js`)
+	match := indexJsRegex.Find(body)
+	if match == nil {
+		return "", fmt.Errorf("could not find index JS script URL on Apple Music page")
+	}
+
+	indexJsURL := "https://beta.music.apple.com" + string(match)
+
+	// Step 3: Fetch the JS file
+	jsReq, err := http.NewRequest("GET", indexJsURL, nil)
+	if err != nil {
+		return "", fmt.Errorf("failed to create JS request: %w", err)
+	}
+	jsReq.Header.Set("User-Agent", getRandomUserAgent())
+
+	jsResp, err := client.Do(jsReq)
+	if err != nil {
+		return "", fmt.Errorf("failed to fetch Apple Music JS: %w", err)
+	}
+	defer jsResp.Body.Close()
+
+	jsBody, err := io.ReadAll(jsResp.Body)
+	if err != nil {
+		return "", fmt.Errorf("failed to read Apple Music JS: %w", err)
+	}
+
+	// Step 4: Extract JWT token (starts with eyJh)
+	tokenRegex := regexp.MustCompile(`eyJh[^"]*`)
+	tokenMatch := tokenRegex.Find(jsBody)
+	if tokenMatch == nil {
+		return "", fmt.Errorf("could not find JWT token in Apple Music JS")
+	}
+
+	m.token = string(tokenMatch)
+	GoLog("[AppleMusic] Token obtained successfully (length: %d)\n", len(m.token))
+	return m.token, nil
+}
+
+func (m *appleTokenManager) clearToken() {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	m.token = ""
+}
+
+// Apple Music API response models
+type appleMusicSearchResponse struct {
+	Results struct {
+		Songs *struct {
+			Data []struct {
+				ID   string `json:"id"`
+				Type string `json:"type"`
+			} `json:"data"`
+		} `json:"songs"`
+	} `json:"results"`
+	Resources *struct {
+		Songs map[string]struct {
+			Attributes struct {
+				Name       string `json:"name"`
+				ArtistName string `json:"artistName"`
+				AlbumName  string `json:"albumName"`
+				URL        string `json:"url"`
+				Artwork    struct {
+					URL string `json:"url"`
+				} `json:"artwork"`
+			} `json:"attributes"`
+		} `json:"songs"`
+	} `json:"resources"`
+}
+
+// PaxResponse represents the lyrics proxy response for word-by-word / line lyrics
+type paxResponse struct {
+	Type    string      `json:"type"`    // "Syllable" or "Line"
+	Content []paxLyrics `json:"content"` // List of lyric lines
+}
+
+type paxLyrics struct {
+	Text           []paxLyricDetail `json:"text"`
+	Timestamp      int              `json:"timestamp"`
+	OppositeTurn   bool             `json:"oppositeTurn"`
+	Background     bool             `json:"background"`
+	BackgroundText []paxLyricDetail `json:"backgroundText"`
+	EndTime        int              `json:"endtime"`
+}
+
+type paxLyricDetail struct {
+	Text      string `json:"text"`
+	Part      bool   `json:"part"`
+	Timestamp *int   `json:"timestamp"`
+	EndTime   *int   `json:"endtime"`
+}
+
+func NewAppleMusicClient() *AppleMusicClient {
+	return &AppleMusicClient{
+		httpClient: NewMetadataHTTPClient(20 * time.Second),
+	}
+}
+
+// SearchSong searches for a song on Apple Music and returns its ID.
+func (c *AppleMusicClient) SearchSong(trackName, artistName string) (string, error) {
+	query := trackName + " " + artistName
+	if strings.TrimSpace(query) == "" {
+		return "", fmt.Errorf("empty search query")
+	}
+
+	token, err := globalAppleTokenManager.getToken(c.httpClient)
+	if err != nil {
+		return "", fmt.Errorf("apple music token error: %w", err)
+	}
+
+	encodedQuery := url.QueryEscape(query)
+	searchURL := fmt.Sprintf(
+		"https://amp-api.music.apple.com/v1/catalog/us/search?term=%s&types=songs&limit=5&l=en-US&platform=web&format[resources]=map&include[songs]=artists&extend=artistUrl",
+		encodedQuery,
+	)
+
+	req, err := http.NewRequest("GET", searchURL, nil)
+	if err != nil {
+		return "", fmt.Errorf("failed to create request: %w", err)
+	}
+
+	req.Header.Set("Authorization", "Bearer "+token)
+	req.Header.Set("Origin", "https://music.apple.com")
+	req.Header.Set("Referer", "https://music.apple.com/")
+	req.Header.Set("User-Agent", getRandomUserAgent())
+	req.Header.Set("Accept", "application/json")
+
+	resp, err := c.httpClient.Do(req)
+	if err != nil {
+		return "", fmt.Errorf("apple music search failed: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode == 401 {
+		globalAppleTokenManager.clearToken()
+		return "", fmt.Errorf("apple music token expired")
+	}
+
+	if resp.StatusCode != 200 {
+		return "", fmt.Errorf("apple music search returned HTTP %d", resp.StatusCode)
+	}
+
+	var searchResp appleMusicSearchResponse
+	if err := json.NewDecoder(resp.Body).Decode(&searchResp); err != nil {
+		return "", fmt.Errorf("failed to decode apple music response: %w", err)
+	}
+
+	if searchResp.Results.Songs == nil || len(searchResp.Results.Songs.Data) == 0 {
+		return "", fmt.Errorf("no songs found on apple music")
+	}
+
+	return searchResp.Results.Songs.Data[0].ID, nil
+}
+
+// FetchLyricsByID fetches lyrics from the paxsenix proxy using Apple Music song ID.
+func (c *AppleMusicClient) FetchLyricsByID(songID string) (string, error) {
+	lyricsURL := fmt.Sprintf("https://lyrics.paxsenix.org/apple-music/lyrics?id=%s", songID)
+
+	req, err := http.NewRequest("GET", lyricsURL, nil)
+	if err != nil {
+		return "", fmt.Errorf("failed to create request: %w", err)
+	}
+	req.Header.Set("User-Agent", getRandomUserAgent())
+
+	resp, err := c.httpClient.Do(req)
+	if err != nil {
+		return "", fmt.Errorf("apple music lyrics fetch failed: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != 200 {
+		return "", fmt.Errorf("apple music lyrics proxy returned HTTP %d", resp.StatusCode)
+	}
+
+	bodyBytes, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return "", fmt.Errorf("failed to read lyrics response: %w", err)
+	}
+
+	bodyStr := strings.TrimSpace(string(bodyBytes))
+	if bodyStr == "" {
+		return "", fmt.Errorf("empty lyrics response from apple music")
+	}
+
+	return bodyStr, nil
+}
+
+// formatPaxLyricsToLRC converts a pax proxy response to standard LRC format.
+func formatPaxLyricsToLRC(rawJSON string, multiPersonWordByWord bool) (string, error) {
+	// Try to parse as PaxResponse first
+	var paxResp paxResponse
+	if err := json.Unmarshal([]byte(rawJSON), &paxResp); err == nil && paxResp.Content != nil {
+		return formatPaxContent(paxResp.Type, paxResp.Content, multiPersonWordByWord), nil
+	}
+
+	// Try to parse as a direct list of PaxLyrics
+	var directLyrics []paxLyrics
+	if err := json.Unmarshal([]byte(rawJSON), &directLyrics); err == nil && len(directLyrics) > 0 {
+		return formatPaxContent("Syllable", directLyrics, multiPersonWordByWord), nil
+	}
+
+	return "", fmt.Errorf("failed to parse pax lyrics response")
+}
+
+func appendPaxLyricDetail(builder *strings.Builder, details []paxLyricDetail) {
+	lastStart := ""
+
+	for _, syllable := range details {
+		if syllable.Timestamp != nil {
+			start := fmt.Sprintf("<%s>", msToLRCTimestampInline(int64(*syllable.Timestamp)))
+			if start != lastStart {
+				builder.WriteString(start)
+				lastStart = start
+			}
+		}
+
+		builder.WriteString(syllable.Text)
+		if !syllable.Part {
+			builder.WriteString(" ")
+		}
+
+		if syllable.EndTime != nil {
+			builder.WriteString(fmt.Sprintf("<%s>", msToLRCTimestampInline(int64(*syllable.EndTime))))
+		}
+	}
+}
+
+func formatPaxContent(lyricsType string, content []paxLyrics, multiPersonWordByWord bool) string {
+	var sb strings.Builder
+
+	for i, line := range content {
+		if i > 0 {
+			sb.WriteString("\n")
+		}
+
+		timestamp := msToLRCTimestamp(int64(line.Timestamp))
+
+		if strings.EqualFold(lyricsType, "Syllable") {
+			sb.WriteString(timestamp)
+			if multiPersonWordByWord {
+				if line.OppositeTurn {
+					sb.WriteString("v2:")
+				} else {
+					sb.WriteString("v1:")
+				}
+			}
+
+			appendPaxLyricDetail(&sb, line.Text)
+
+			if line.Background && multiPersonWordByWord && len(line.BackgroundText) > 0 {
+				sb.WriteString("\n[bg:")
+				appendPaxLyricDetail(&sb, line.BackgroundText)
+				sb.WriteString("]")
+			}
+		} else {
+			if len(line.Text) > 0 {
+				sb.WriteString(timestamp)
+				sb.WriteString(line.Text[0].Text)
+			}
+		}
+	}
+
+	return strings.TrimSpace(sb.String())
+}
+
+// FetchLyrics searches Apple Music and returns parsed LyricsResponse.
+func (c *AppleMusicClient) FetchLyrics(
+	trackName,
+	artistName string,
+	durationSec float64,
+	multiPersonWordByWord bool,
+) (*LyricsResponse, error) {
+	songID, err := c.SearchSong(trackName, artistName)
+	if err != nil {
+		return nil, err
+	}
+
+	rawLyrics, err := c.FetchLyricsByID(songID)
+	if err != nil {
+		return nil, err
+	}
+	if errMsg, isErrorPayload := detectLyricsErrorPayload(rawLyrics); isErrorPayload {
+		return nil, fmt.Errorf("apple music proxy returned non-lyric payload: %s", errMsg)
+	}
+
+	// Try to parse as pax format (word-by-word or line)
+	lrcText, err := formatPaxLyricsToLRC(rawLyrics, multiPersonWordByWord)
+	if err != nil {
+		// If pax parsing fails, try to parse as direct LRC text
+		lrcText = rawLyrics
+	}
+
+	lines := parseSyncedLyrics(lrcText)
+	if len(lines) > 0 {
+		return &LyricsResponse{
+			Lines:    lines,
+			SyncType: "LINE_SYNCED",
+			Provider: "Apple Music",
+			Source:   "Apple Music",
+		}, nil
+	}
+
+	// Fall back to plain text if no timestamps found
+	plainLines := strings.Split(lrcText, "\n")
+	var resultLines []LyricsLine
+	for _, line := range plainLines {
+		trimmed := strings.TrimSpace(line)
+		if trimmed != "" {
+			resultLines = append(resultLines, LyricsLine{
+				StartTimeMs: 0,
+				Words:       trimmed,
+				EndTimeMs:   0,
+			})
+		}
+	}
+
+	if len(resultLines) > 0 {
+		return &LyricsResponse{
+			Lines:    resultLines,
+			SyncType: "UNSYNCED",
+			Provider: "Apple Music",
+			Source:   "Apple Music",
+		}, nil
+	}
+
+	return nil, fmt.Errorf("no lyrics found on apple music")
+}

go_backend/lyrics_musixmatch.go

@@ -0,0 +1,214 @@
+package gobackend
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"net/url"
+	"strings"
+	"time"
+)
+
+// MusixmatchClient fetches lyrics from Musixmatch via a proxy server.
+// The proxy handles Musixmatch authentication internally.
+type MusixmatchClient struct {
+	httpClient *http.Client
+	baseURL    string
+}
+
+// Musixmatch proxy response models
+type musixmatchSearchResponse struct {
+	ID                 int64                     `json:"id"`
+	SongName           string                    `json:"songName"`
+	ArtistName         string                    `json:"artistName"`
+	AlbumName          string                    `json:"albumName"`
+	Artwork            string                    `json:"artwork"`
+	ReleaseDate        string                    `json:"releaseDate"`
+	Duration           int                       `json:"duration"`
+	URL                string                    `json:"url"`
+	AlbumID            int64                     `json:"albumId"`
+	HasSyncedLyrics    bool                      `json:"hasSyncedLyrics"`
+	HasUnsyncedLyrics  bool                      `json:"hasUnsyncedLyrics"`
+	AvailableLanguages []string                  `json:"availableLanguages"`
+	OriginalLanguage   string                    `json:"originalLanguage"`
+	SyncedLyrics       *musixmatchLyricsResponse `json:"syncedLyrics"`
+	UnsyncedLyrics     *musixmatchLyricsResponse `json:"unsyncedLyrics"`
+}
+
+type musixmatchLyricsResponse struct {
+	ID          int64  `json:"id"`
+	Duration    int    `json:"duration"`
+	Language    string `json:"language"`
+	UpdatedTime string `json:"updatedTime"`
+	Lyrics      string `json:"lyrics"`
+}
+
+func NewMusixmatchClient() *MusixmatchClient {
+	return &MusixmatchClient{
+		httpClient: NewMetadataHTTPClient(15 * time.Second),
+		baseURL:    "http://158.180.60.95",
+	}
+}
+
+// searchAndGetLyrics searches for a song and retrieves its lyrics in one call.
+// The Musixmatch proxy returns both search result and lyrics in a single response.
+func (c *MusixmatchClient) searchAndGetLyrics(trackName, artistName string) (*musixmatchSearchResponse, error) {
+	if strings.TrimSpace(trackName) == "" || strings.TrimSpace(artistName) == "" {
+		return nil, fmt.Errorf("empty track or artist name")
+	}
+
+	encodedArtist := url.QueryEscape(artistName)
+	encodedTrack := url.QueryEscape(trackName)
+
+	fullURL := fmt.Sprintf("%s/v2/full?artist=%s&track=%s", c.baseURL, encodedArtist, encodedTrack)
+
+	req, err := http.NewRequest("GET", fullURL, nil)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create request: %w", err)
+	}
+	req.Header.Set("User-Agent", getRandomUserAgent())
+
+	resp, err := c.httpClient.Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("musixmatch search failed: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != 200 {
+		return nil, fmt.Errorf("musixmatch proxy returned HTTP %d", resp.StatusCode)
+	}
+
+	var result musixmatchSearchResponse
+	if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
+		return nil, fmt.Errorf("failed to decode musixmatch response: %w", err)
+	}
+
+	return &result, nil
+}
+
+// FetchLyricsInLanguage retrieves lyrics from Musixmatch for a specific language code.
+func (c *MusixmatchClient) FetchLyricsInLanguage(songID int64, language string) (*LyricsResponse, error) {
+	lang := strings.ToLower(strings.TrimSpace(language))
+	if songID <= 0 || lang == "" {
+		return nil, fmt.Errorf("invalid song id or language")
+	}
+
+	fullURL := fmt.Sprintf("%s/v2/full?id=%d&lang=%s", c.baseURL, songID, url.QueryEscape(lang))
+
+	req, err := http.NewRequest("GET", fullURL, nil)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create request: %w", err)
+	}
+	req.Header.Set("User-Agent", getRandomUserAgent())
+
+	resp, err := c.httpClient.Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("musixmatch language fetch failed: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != 200 {
+		return nil, fmt.Errorf("musixmatch language endpoint returned HTTP %d", resp.StatusCode)
+	}
+
+	var result musixmatchSearchResponse
+	if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
+		return nil, fmt.Errorf("failed to decode musixmatch language response: %w", err)
+	}
+
+	// Prefer synced lyrics for selected language
+	if result.SyncedLyrics != nil && strings.TrimSpace(result.SyncedLyrics.Lyrics) != "" {
+		lines := parseSyncedLyrics(result.SyncedLyrics.Lyrics)
+		if len(lines) > 0 {
+			return &LyricsResponse{
+				Lines:    lines,
+				SyncType: "LINE_SYNCED",
+				Provider: "Musixmatch",
+				Source:   fmt.Sprintf("Musixmatch (%s)", lang),
+			}, nil
+		}
+	}
+
+	// Fall back to unsynced lyrics for selected language
+	if result.UnsyncedLyrics != nil && strings.TrimSpace(result.UnsyncedLyrics.Lyrics) != "" {
+		var lines []LyricsLine
+		for _, line := range strings.Split(result.UnsyncedLyrics.Lyrics, "\n") {
+			trimmed := strings.TrimSpace(line)
+			if trimmed != "" {
+				lines = append(lines, LyricsLine{
+					StartTimeMs: 0,
+					Words:       trimmed,
+					EndTimeMs:   0,
+				})
+			}
+		}
+
+		if len(lines) > 0 {
+			return &LyricsResponse{
+				Lines:       lines,
+				SyncType:    "UNSYNCED",
+				PlainLyrics: result.UnsyncedLyrics.Lyrics,
+				Provider:    "Musixmatch",
+				Source:      fmt.Sprintf("Musixmatch (%s)", lang),
+			}, nil
+		}
+	}
+
+	return nil, fmt.Errorf("no lyrics found on musixmatch for language %s", lang)
+}
+
+// FetchLyrics searches Musixmatch and returns parsed LyricsResponse.
+func (c *MusixmatchClient) FetchLyrics(trackName, artistName string, durationSec float64, preferredLanguage string) (*LyricsResponse, error) {
+	result, err := c.searchAndGetLyrics(trackName, artistName)
+	if err != nil {
+		return nil, err
+	}
+
+	if preferred := strings.ToLower(strings.TrimSpace(preferredLanguage)); preferred != "" && result.ID > 0 {
+		localized, localizedErr := c.FetchLyricsInLanguage(result.ID, preferred)
+		if localizedErr == nil {
+			return localized, nil
+		}
+		GoLog("[Musixmatch] Language override '%s' failed: %v\n", preferred, localizedErr)
+	}
+
+	// Prefer synced lyrics
+	if result.SyncedLyrics != nil && strings.TrimSpace(result.SyncedLyrics.Lyrics) != "" {
+		lines := parseSyncedLyrics(result.SyncedLyrics.Lyrics)
+		if len(lines) > 0 {
+			return &LyricsResponse{
+				Lines:    lines,
+				SyncType: "LINE_SYNCED",
+				Provider: "Musixmatch",
+				Source:   "Musixmatch",
+			}, nil
+		}
+	}
+
+	// Fall back to unsynced lyrics
+	if result.UnsyncedLyrics != nil && strings.TrimSpace(result.UnsyncedLyrics.Lyrics) != "" {
+		var lines []LyricsLine
+		for _, line := range strings.Split(result.UnsyncedLyrics.Lyrics, "\n") {
+			trimmed := strings.TrimSpace(line)
+			if trimmed != "" {
+				lines = append(lines, LyricsLine{
+					StartTimeMs: 0,
+					Words:       trimmed,
+					EndTimeMs:   0,
+				})
+			}
+		}
+
+		if len(lines) > 0 {
+			return &LyricsResponse{
+				Lines:       lines,
+				SyncType:    "UNSYNCED",
+				PlainLyrics: result.UnsyncedLyrics.Lyrics,
+				Provider:    "Musixmatch",
+				Source:      "Musixmatch",
+			}, nil
+		}
+	}
+
+	return nil, fmt.Errorf("no lyrics found on musixmatch")
+}

go_backend/lyrics_netease.go

@@ -0,0 +1,209 @@
+package gobackend
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"net/url"
+	"strings"
+	"time"
+)
+
+// NeteaseClient fetches lyrics from NetEase Cloud Music (music.163.com).
+// This is a direct public API — no proxy dependency.
+type NeteaseClient struct {
+	httpClient *http.Client
+}
+
+// Netease API response models
+type neteaseSearchResponse struct {
+	Result struct {
+		Songs []struct {
+			Name    string `json:"name"`
+			ID      int64  `json:"id"`
+			Artists []struct {
+				Name string `json:"name"`
+			} `json:"artists"`
+		} `json:"songs"`
+		SongCount int `json:"songCount"`
+	} `json:"result"`
+	Code int `json:"code"`
+}
+
+type neteaseLyricsResponse struct {
+	LRC     *neteaseLyricField `json:"lrc"`
+	TLyric  *neteaseLyricField `json:"tlyric"`
+	RomaLRC *neteaseLyricField `json:"romalrc"`
+	Code    int                `json:"code"`
+}
+
+type neteaseLyricField struct {
+	Lyric string `json:"lyric"`
+}
+
+var neteaseHeaders = map[string]string{
+	"Accept":          "application/json",
+	"Accept-Language": "en-US,en;q=0.9",
+	"Cache-Control":   "max-age=0",
+}
+
+func NewNeteaseClient() *NeteaseClient {
+	return &NeteaseClient{
+		httpClient: NewMetadataHTTPClient(15 * time.Second),
+	}
+}
+
+// SearchSong searches for a song on Netease and returns the song ID.
+func (c *NeteaseClient) SearchSong(trackName, artistName string) (int64, error) {
+	query := trackName + " " + artistName
+	if strings.TrimSpace(query) == "" {
+		return 0, fmt.Errorf("empty search query")
+	}
+
+	searchURL := "http://music.163.com/api/search/pc"
+	params := url.Values{}
+	params.Set("s", query)
+	params.Set("type", "1")
+	params.Set("limit", "1")
+	params.Set("offset", "0")
+
+	fullURL := searchURL + "?" + params.Encode()
+
+	req, err := http.NewRequest("GET", fullURL, nil)
+	if err != nil {
+		return 0, fmt.Errorf("failed to create request: %w", err)
+	}
+
+	for k, v := range neteaseHeaders {
+		req.Header.Set(k, v)
+	}
+	req.Header.Set("User-Agent", getRandomUserAgent())
+
+	resp, err := c.httpClient.Do(req)
+	if err != nil {
+		return 0, fmt.Errorf("netease search failed: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != 200 {
+		return 0, fmt.Errorf("netease search returned HTTP %d", resp.StatusCode)
+	}
+
+	var searchResp neteaseSearchResponse
+	if err := json.NewDecoder(resp.Body).Decode(&searchResp); err != nil {
+		return 0, fmt.Errorf("failed to decode netease search: %w", err)
+	}
+
+	if searchResp.Result.SongCount == 0 || len(searchResp.Result.Songs) == 0 {
+		return 0, fmt.Errorf("no songs found on netease")
+	}
+
+	return searchResp.Result.Songs[0].ID, nil
+}
+
+// FetchLyricsByID fetches synced lyrics for a given Netease song ID.
+func (c *NeteaseClient) FetchLyricsByID(songID int64, includeTranslation, includeRomanization bool) (string, error) {
+	lyricsURL := "http://music.163.com/api/song/lyric"
+	params := url.Values{}
+	params.Set("id", fmt.Sprintf("%d", songID))
+	params.Set("lv", "1")
+	params.Set("tv", "1")
+	params.Set("rv", "1")
+
+	fullURL := lyricsURL + "?" + params.Encode()
+
+	req, err := http.NewRequest("GET", fullURL, nil)
+	if err != nil {
+		return "", fmt.Errorf("failed to create request: %w", err)
+	}
+
+	for k, v := range neteaseHeaders {
+		req.Header.Set(k, v)
+	}
+	req.Header.Set("User-Agent", getRandomUserAgent())
+
+	resp, err := c.httpClient.Do(req)
+	if err != nil {
+		return "", fmt.Errorf("netease lyrics fetch failed: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != 200 {
+		return "", fmt.Errorf("netease lyrics returned HTTP %d", resp.StatusCode)
+	}
+
+	var lyricsResp neteaseLyricsResponse
+	if err := json.NewDecoder(resp.Body).Decode(&lyricsResp); err != nil {
+		return "", fmt.Errorf("failed to decode netease lyrics: %w", err)
+	}
+
+	if lyricsResp.LRC == nil || strings.TrimSpace(lyricsResp.LRC.Lyric) == "" {
+		return "", fmt.Errorf("no lyrics available on netease")
+	}
+
+	lyric := lyricsResp.LRC.Lyric
+
+	if includeTranslation && lyricsResp.TLyric != nil && strings.TrimSpace(lyricsResp.TLyric.Lyric) != "" {
+		lyric += "\n\n" + lyricsResp.TLyric.Lyric
+	}
+
+	if includeRomanization && lyricsResp.RomaLRC != nil && strings.TrimSpace(lyricsResp.RomaLRC.Lyric) != "" {
+		lyric += "\n\n" + lyricsResp.RomaLRC.Lyric
+	}
+
+	return lyric, nil
+}
+
+// FetchLyrics searches for a track and returns parsed LyricsResponse.
+func (c *NeteaseClient) FetchLyrics(
+	trackName,
+	artistName string,
+	durationSec float64,
+	includeTranslation,
+	includeRomanization bool,
+) (*LyricsResponse, error) {
+	songID, err := c.SearchSong(trackName, artistName)
+	if err != nil {
+		return nil, err
+	}
+
+	lrcText, err := c.FetchLyricsByID(songID, includeTranslation, includeRomanization)
+	if err != nil {
+		return nil, err
+	}
+
+	// Parse the LRC text into LyricsResponse
+	lines := parseSyncedLyrics(lrcText)
+	if len(lines) == 0 {
+		// May be plain text lyrics without timestamps
+		plainLines := strings.Split(lrcText, "\n")
+		for _, line := range plainLines {
+			trimmed := strings.TrimSpace(line)
+			if trimmed != "" {
+				lines = append(lines, LyricsLine{
+					StartTimeMs: 0,
+					Words:       trimmed,
+					EndTimeMs:   0,
+				})
+			}
+		}
+
+		if len(lines) == 0 {
+			return nil, fmt.Errorf("netease returned empty lyrics")
+		}
+
+		return &LyricsResponse{
+			Lines:    lines,
+			SyncType: "UNSYNCED",
+			Provider: "Netease",
+			Source:   "Netease",
+		}, nil
+	}
+
+	return &LyricsResponse{
+		Lines:    lines,
+		SyncType: "LINE_SYNCED",
+		Provider: "Netease",
+		Source:   "Netease",
+	}, nil
+}

go_backend/lyrics_qqmusic.go

@@ -0,0 +1,211 @@
+package gobackend
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"strings"
+	"time"
+)
+
+// QQMusicClient fetches lyrics from QQ Music.
+// Search uses public QQ Music API, lyrics use the paxsenix proxy.
+type QQMusicClient struct {
+	httpClient *http.Client
+}
+
+// QQ Music search response models
+type qqMusicSearchResponse struct {
+	Data struct {
+		Song struct {
+			List []struct {
+				Title  string `json:"title"`
+				Singer []struct {
+					Name string `json:"name"`
+				} `json:"singer"`
+				Album struct {
+					Name string `json:"name"`
+				} `json:"album"`
+				ID int64 `json:"id"`
+			} `json:"list"`
+		} `json:"song"`
+	} `json:"data"`
+}
+
+// QQ Music lyrics request payload for paxsenix proxy
+type qqLyricsPayload struct {
+	Artist []string `json:"artist"`
+	Album  string   `json:"album"`
+	ID     int64    `json:"id"`
+	Title  string   `json:"title"`
+}
+
+func NewQQMusicClient() *QQMusicClient {
+	return &QQMusicClient{
+		httpClient: NewMetadataHTTPClient(15 * time.Second),
+	}
+}
+
+// searchSong searches QQ Music and returns the song info needed for lyrics fetch.
+func (c *QQMusicClient) searchSong(trackName, artistName string) (*qqLyricsPayload, error) {
+	query := trackName + " " + artistName
+	if strings.TrimSpace(query) == "" {
+		return nil, fmt.Errorf("empty search query")
+	}
+
+	searchURL := "https://c.y.qq.com/soso/fcgi-bin/client_search_cp"
+	params := url.Values{}
+	params.Set("format", "json")
+	params.Set("inCharset", "utf8")
+	params.Set("outCharset", "utf8")
+	params.Set("platform", "yqq.json")
+	params.Set("new_json", "1")
+	params.Set("w", query)
+
+	fullURL := searchURL + "?" + params.Encode()
+
+	req, err := http.NewRequest("GET", fullURL, nil)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create request: %w", err)
+	}
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("User-Agent", getRandomUserAgent())
+
+	resp, err := c.httpClient.Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("qqmusic search failed: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != 200 {
+		return nil, fmt.Errorf("qqmusic search returned HTTP %d", resp.StatusCode)
+	}
+
+	var searchResp qqMusicSearchResponse
+	if err := json.NewDecoder(resp.Body).Decode(&searchResp); err != nil {
+		return nil, fmt.Errorf("failed to decode qqmusic response: %w", err)
+	}
+
+	if len(searchResp.Data.Song.List) == 0 {
+		return nil, fmt.Errorf("no songs found on qqmusic")
+	}
+
+	song := searchResp.Data.Song.List[0]
+
+	var artists []string
+	for _, singer := range song.Singer {
+		artists = append(artists, singer.Name)
+	}
+
+	return &qqLyricsPayload{
+		Artist: artists,
+		Album:  song.Album.Name,
+		ID:     song.ID,
+		Title:  song.Title,
+	}, nil
+}
+
+// fetchLyricsByPayload fetches lyrics from the paxsenix proxy using QQ Music song info.
+func (c *QQMusicClient) fetchLyricsByPayload(payload *qqLyricsPayload) (string, error) {
+	lyricsURL := "https://paxsenix.alwaysdata.net/getQQLyrics.php"
+
+	payloadBytes, err := json.Marshal(payload)
+	if err != nil {
+		return "", fmt.Errorf("failed to marshal payload: %w", err)
+	}
+
+	req, err := http.NewRequest("POST", lyricsURL, bytes.NewReader(payloadBytes))
+	if err != nil {
+		return "", fmt.Errorf("failed to create request: %w", err)
+	}
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("User-Agent", getRandomUserAgent())
+
+	resp, err := c.httpClient.Do(req)
+	if err != nil {
+		return "", fmt.Errorf("qqmusic lyrics fetch failed: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != 200 {
+		return "", fmt.Errorf("qqmusic lyrics proxy returned HTTP %d", resp.StatusCode)
+	}
+
+	bodyBytes, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return "", fmt.Errorf("failed to read lyrics response: %w", err)
+	}
+
+	bodyStr := strings.TrimSpace(string(bodyBytes))
+	if bodyStr == "" {
+		return "", fmt.Errorf("empty lyrics response from qqmusic")
+	}
+
+	return bodyStr, nil
+}
+
+// FetchLyrics searches QQ Music and returns parsed LyricsResponse.
+func (c *QQMusicClient) FetchLyrics(
+	trackName,
+	artistName string,
+	durationSec float64,
+	multiPersonWordByWord bool,
+) (*LyricsResponse, error) {
+	payload, err := c.searchSong(trackName, artistName)
+	if err != nil {
+		return nil, err
+	}
+
+	rawLyrics, err := c.fetchLyricsByPayload(payload)
+	if err != nil {
+		return nil, err
+	}
+	if errMsg, isErrorPayload := detectLyricsErrorPayload(rawLyrics); isErrorPayload {
+		return nil, fmt.Errorf("qqmusic proxy returned non-lyric payload: %s", errMsg)
+	}
+
+	// Try to parse as pax format (word-by-word or line)
+	lrcText, err := formatPaxLyricsToLRC(rawLyrics, multiPersonWordByWord)
+	if err != nil {
+		// If pax parsing fails, try to use as direct LRC text
+		lrcText = rawLyrics
+	}
+
+	lines := parseSyncedLyrics(lrcText)
+	if len(lines) > 0 {
+		return &LyricsResponse{
+			Lines:    lines,
+			SyncType: "LINE_SYNCED",
+			Provider: "QQ Music",
+			Source:   "QQ Music",
+		}, nil
+	}
+
+	// Fall back to plain text
+	plainLines := strings.Split(lrcText, "\n")
+	var resultLines []LyricsLine
+	for _, line := range plainLines {
+		trimmed := strings.TrimSpace(line)
+		if trimmed != "" {
+			resultLines = append(resultLines, LyricsLine{
+				StartTimeMs: 0,
+				Words:       trimmed,
+				EndTimeMs:   0,
+			})
+		}
+	}
+
+	if len(resultLines) > 0 {
+		return &LyricsResponse{
+			Lines:    resultLines,
+			SyncType: "UNSYNCED",
+			Provider: "QQ Music",
+			Source:   "QQ Music",
+		}, nil
+	}
+
+	return nil, fmt.Errorf("no lyrics found on qqmusic")
+}

go_backend/qobuz.go

@@ -174,6 +174,26 @@ func qobuzTitlesMatch(expectedTitle, foundTitle string) bool {
 		return true
 	}
 
+	looseExpected := normalizeLooseTitle(normExpected)
+	looseFound := normalizeLooseTitle(normFound)
+	if looseExpected != "" && looseFound != "" {
+		if looseExpected == looseFound {
+			return true
+		}
+		if strings.Contains(looseExpected, looseFound) || strings.Contains(looseFound, looseExpected) {
+			return true
+		}
+	}
+
+	// Some tracks are symbol/emoji-heavy and providers can return textual
+	// aliases. If artist/duration already matched upstream, avoid false rejects.
+	if (!hasAlphaNumericRunes(expectedTitle) || !hasAlphaNumericRunes(foundTitle)) &&
+		strings.TrimSpace(expectedTitle) != "" &&
+		strings.TrimSpace(foundTitle) != "" {
+		GoLog("[Qobuz] Symbol-heavy title detected, relaxing match: '%s' vs '%s'\n", expectedTitle, foundTitle)
+		return true
+	}
+
 	expectedLatin := qobuzIsLatinScript(expectedTitle)
 	foundLatin := qobuzIsLatinScript(foundTitle)
 	if expectedLatin != foundLatin {

go_backend/tidal.go

@@ -1289,6 +1289,26 @@ func titlesMatch(expectedTitle, foundTitle string) bool {
 		return true
 	}
 
+	looseExpected := normalizeLooseTitle(normExpected)
+	looseFound := normalizeLooseTitle(normFound)
+	if looseExpected != "" && looseFound != "" {
+		if looseExpected == looseFound {
+			return true
+		}
+		if strings.Contains(looseExpected, looseFound) || strings.Contains(looseFound, looseExpected) {
+			return true
+		}
+	}
+
+	// Some tracks are symbol/emoji-heavy and providers can return textual
+	// aliases. If artist/duration already matched upstream, avoid false rejects.
+	if (!hasAlphaNumericRunes(expectedTitle) || !hasAlphaNumericRunes(foundTitle)) &&
+		strings.TrimSpace(expectedTitle) != "" &&
+		strings.TrimSpace(foundTitle) != "" {
+		GoLog("[Tidal] Symbol-heavy title detected, relaxing match: '%s' vs '%s'\n", expectedTitle, foundTitle)
+		return true
+	}
+
 	expectedLatin := isLatinScript(expectedTitle)
 	foundLatin := isLatinScript(foundTitle)
 	if expectedLatin != foundLatin {

go_backend/title_match_utils.go

@@ -0,0 +1,43 @@
+package gobackend
+
+import (
+	"strings"
+	"unicode"
+)
+
+// normalizeLooseTitle collapses separators/punctuation so titles like
+// "Doctor / Cops" and "Doctor _ Cops" can still match.
+func normalizeLooseTitle(title string) string {
+	trimmed := strings.TrimSpace(strings.ToLower(title))
+	if trimmed == "" {
+		return ""
+	}
+
+	var b strings.Builder
+	b.Grow(len(trimmed))
+
+	for _, r := range trimmed {
+		switch {
+		case unicode.IsLetter(r), unicode.IsNumber(r):
+			b.WriteRune(r)
+		case unicode.IsSpace(r):
+			b.WriteByte(' ')
+		// Treat common separators as spaces.
+		case r == '/', r == '\\', r == '_', r == '-', r == '|', r == '.', r == '&', r == '+':
+			b.WriteByte(' ')
+		default:
+			// Drop other punctuation/symbols (including emoji) for loose matching.
+		}
+	}
+
+	return strings.Join(strings.Fields(b.String()), " ")
+}
+
+func hasAlphaNumericRunes(value string) bool {
+	for _, r := range value {
+		if unicode.IsLetter(r) || unicode.IsNumber(r) {
+			return true
+		}
+	}
+	return false
+}

go_backend/title_match_utils_test.go

@@ -0,0 +1,34 @@
+package gobackend
+
+import "testing"
+
+func TestNormalizeLooseTitle_Separators(t *testing.T) {
+	got := normalizeLooseTitle("Doctor / Cops")
+	if got != "doctor cops" {
+		t.Fatalf("expected doctor cops, got %q", got)
+	}
+
+	got = normalizeLooseTitle("Doctor _ Cops")
+	if got != "doctor cops" {
+		t.Fatalf("expected doctor cops, got %q", got)
+	}
+}
+
+func TestNormalizeLooseTitle_EmojiAndSymbols(t *testing.T) {
+	got := normalizeLooseTitle("Music Of The Spheres 🌎✨")
+	if got != "music of the spheres" {
+		t.Fatalf("expected music of the spheres, got %q", got)
+	}
+}
+
+func TestTitlesMatch_SeparatorVariants(t *testing.T) {
+	if !titlesMatch("Doctor / Cops", "Doctor _ Cops") {
+		t.Fatal("expected tidal titlesMatch to accept / vs _ variant")
+	}
+}
+
+func TestQobuzTitlesMatch_SeparatorVariants(t *testing.T) {
+	if !qobuzTitlesMatch("Doctor / Cops", "Doctor _ Cops") {
+		t.Fatal("expected qobuzTitlesMatch to accept / vs _ variant")
+	}
+}

go_backend/youtube.go

@@ -9,6 +9,7 @@ import (
 	"io"
 	"net/http"
 	"net/url"
+	"strconv"
 	"strings"
 	"sync"
 	"time"
@@ -20,6 +21,8 @@ type YouTubeDownloader struct {
 	mu     sync.Mutex
 }
 
+const spotubeBaseURL = "https://spotubedl.com"
+
 var (
 	globalYouTubeDownloader *YouTubeDownloader
 	youtubeDownloaderOnce   sync.Once
@@ -29,9 +32,17 @@ type YouTubeQuality string
 
 const (
 	YouTubeQualityOpus256 YouTubeQuality = "opus_256"
+	YouTubeQualityOpus128 YouTubeQuality = "opus_128"
+	YouTubeQualityMP3128  YouTubeQuality = "mp3_128"
+	YouTubeQualityMP3256  YouTubeQuality = "mp3_256"
 	YouTubeQualityMP3320  YouTubeQuality = "mp3_320"
 )
 
+var (
+	youtubeOpusSupportedBitrates = []int{128, 256}
+	youtubeMp3SupportedBitrates  = []int{128, 256, 320}
+)
+
 type CobaltRequest struct {
 	URL             string `json:"url"`
 	AudioBitrate    string `json:"audioBitrate,omitempty"`
@@ -79,6 +90,77 @@ func NewYouTubeDownloader() *YouTubeDownloader {
 	return globalYouTubeDownloader
 }
 
+func extractBitrateFromQuality(raw string, defaultBitrate int) int {
+	parts := strings.FieldsFunc(raw, func(r rune) bool {
+		return (r < '0' || r > '9')
+	})
+	for i := len(parts) - 1; i >= 0; i-- {
+		part := parts[i]
+		if part == "" {
+			continue
+		}
+		if parsed, err := strconv.Atoi(part); err == nil {
+			return parsed
+		}
+	}
+	return defaultBitrate
+}
+
+func nearestSupportedBitrate(value int, supported []int) int {
+	nearest := supported[0]
+	nearestDistance := absInt(value - nearest)
+
+	for _, option := range supported[1:] {
+		distance := absInt(value - option)
+		// On tie prefer higher quality.
+		if distance < nearestDistance || (distance == nearestDistance && option > nearest) {
+			nearest = option
+			nearestDistance = distance
+		}
+	}
+
+	return nearest
+}
+
+func absInt(value int) int {
+	if value < 0 {
+		return -value
+	}
+	return value
+}
+
+func parseYouTubeQualityInput(raw string) (format string, bitrate int, normalized YouTubeQuality) {
+	normalizedRaw := strings.ToLower(strings.TrimSpace(raw))
+
+	if strings.HasPrefix(normalizedRaw, "opus") {
+		parsed := extractBitrateFromQuality(normalizedRaw, 256)
+		finalBitrate := nearestSupportedBitrate(parsed, youtubeOpusSupportedBitrates)
+		return "opus", finalBitrate, YouTubeQuality(fmt.Sprintf("opus_%d", finalBitrate))
+	}
+
+	if strings.HasPrefix(normalizedRaw, "mp3") {
+		parsed := extractBitrateFromQuality(normalizedRaw, 320)
+		finalBitrate := nearestSupportedBitrate(parsed, youtubeMp3SupportedBitrates)
+		return "mp3", finalBitrate, YouTubeQuality(fmt.Sprintf("mp3_%d", finalBitrate))
+	}
+
+	// Backward compatibility for legacy symbolic values.
+	switch normalizedRaw {
+	case "opus_256", "opus256", "opus":
+		return "opus", 256, YouTubeQualityOpus256
+	case "opus_128", "opus128":
+		return "opus", 128, YouTubeQualityOpus128
+	case "mp3_320", "mp3320", "mp3", "":
+		return "mp3", 320, YouTubeQualityMP3320
+	case "mp3_256", "mp3256":
+		return "mp3", 256, YouTubeQualityMP3256
+	case "mp3_128", "mp3128":
+		return "mp3", 128, YouTubeQualityMP3128
+	default:
+		return "mp3", 320, YouTubeQualityMP3320
+	}
+}
+
 // SearchYouTube returns a YouTube Music search URL for the given track
 func (y *YouTubeDownloader) SearchYouTube(trackName, artistName string) (string, error) {
 	query := fmt.Sprintf("%s %s", artistName, trackName)
@@ -95,22 +177,11 @@ func (y *YouTubeDownloader) GetDownloadURL(youtubeURL string, quality YouTubeQua
 	y.mu.Lock()
 	defer y.mu.Unlock()
 
-	var audioFormat string
-	var audioBitrate string
-
-	switch quality {
-	case YouTubeQualityOpus256:
-		audioFormat = "opus"
-		audioBitrate = "256"
-	case YouTubeQualityMP3320:
-		audioFormat = "mp3"
-		audioBitrate = "320"
-	default:
-		audioFormat = "mp3"
-		audioBitrate = "320"
-	}
+	audioFormat, bitrate, _ := parseYouTubeQualityInput(string(quality))
+	audioBitrate := strconv.Itoa(bitrate)
 
 	// Try SpotubeDL first (primary)
+	var spotubeErr error
 	videoID, extractErr := ExtractYouTubeVideoID(youtubeURL)
 	if extractErr == nil {
 		GoLog("[YouTube] Requesting from SpotubeDL: videoID=%s (format: %s, bitrate: %s)\n",
@@ -120,6 +191,7 @@ func (y *YouTubeDownloader) GetDownloadURL(youtubeURL string, quality YouTubeQua
 		if err == nil {
 			return resp, nil
 		}
+		spotubeErr = err
 		GoLog("[YouTube] SpotubeDL failed: %v, trying Cobalt fallback...\n", err)
 	} else {
 		GoLog("[YouTube] Could not extract video ID: %v, skipping SpotubeDL\n", extractErr)
@@ -132,6 +204,9 @@ func (y *YouTubeDownloader) GetDownloadURL(youtubeURL string, quality YouTubeQua
 
 	resp, err := y.requestCobaltDirect(cobaltURL, audioFormat, audioBitrate)
 	if err != nil {
+		if spotubeErr != nil {
+			return nil, fmt.Errorf("all download methods failed: spotubedl: %v, cobalt: %v", spotubeErr, err)
+		}
 		return nil, fmt.Errorf("all download methods failed: spotubedl: extractErr=%v, cobalt: %v", extractErr, err)
 	}
 
@@ -201,11 +276,34 @@ func (y *YouTubeDownloader) requestCobaltDirect(videoURL, audioFormat, audioBitr
 }
 
 // requestSpotubeDL uses SpotubeDL as a Cobalt proxy (they handle auth to yt-dl.click instances).
+// Note: engine v2 currently serves MP3-oriented outputs, so we only use v2 for MP3 requests.
 func (y *YouTubeDownloader) requestSpotubeDL(videoID, audioFormat, audioBitrate string) (*CobaltResponse, error) {
-	apiURL := fmt.Sprintf("https://spotubedl.com/api/download/%s?engine=v1&format=%s&quality=%s",
-		videoID, audioFormat, audioBitrate)
+	engines := []string{"v1"}
+	if strings.EqualFold(audioFormat, "mp3") {
+		engines = append(engines, "v2")
+	}
+	var lastErr error
 
-	GoLog("[YouTube] Requesting from SpotubeDL: %s\n", apiURL)
+	for _, engine := range engines {
+		resp, err := y.requestSpotubeDLEngine(videoID, audioFormat, audioBitrate, engine)
+		if err == nil {
+			return resp, nil
+		}
+		lastErr = err
+		GoLog("[YouTube] SpotubeDL (%s) failed: %v\n", engine, err)
+	}
+
+	if lastErr == nil {
+		lastErr = fmt.Errorf("no SpotubeDL engine available")
+	}
+	return nil, lastErr
+}
+
+func (y *YouTubeDownloader) requestSpotubeDLEngine(videoID, audioFormat, audioBitrate, engine string) (*CobaltResponse, error) {
+	apiURL := fmt.Sprintf("%s/api/download/%s?engine=%s&format=%s&quality=%s",
+		spotubeBaseURL, videoID, url.QueryEscape(engine), url.QueryEscape(audioFormat), url.QueryEscape(audioBitrate))
+
+	GoLog("[YouTube] Requesting from SpotubeDL (%s): %s\n", engine, apiURL)
 
 	req, err := http.NewRequest("GET", apiURL, nil)
 	if err != nil {
@@ -225,27 +323,60 @@ func (y *YouTubeDownloader) requestSpotubeDL(videoID, audioFormat, audioBitrate
 		return nil, fmt.Errorf("failed to read response: %w", err)
 	}
 
-	GoLog("[YouTube] SpotubeDL response status: %d\n", resp.StatusCode)
+	GoLog("[YouTube] SpotubeDL (%s) response status: %d\n", engine, resp.StatusCode)
 
 	if resp.StatusCode != 200 {
-		return nil, fmt.Errorf("spotubedl returned status %d: %s", resp.StatusCode, string(body))
+		return nil, fmt.Errorf("spotubedl(%s) returned status %d: %s", engine, resp.StatusCode, string(body))
 	}
 
 	var result struct {
-		URL string `json:"url"`
+		URL      string `json:"url"`
+		Status   string `json:"status"`
+		Error    string `json:"error"`
+		Message  string `json:"message"`
+		Filename string `json:"filename"`
 	}
 	if err := json.Unmarshal(body, &result); err != nil {
 		return nil, fmt.Errorf("failed to parse spotubedl response: %w", err)
 	}
 
-	if result.URL == "" {
-		return nil, fmt.Errorf("no download URL from spotubedl")
+	downloadURL := strings.TrimSpace(result.URL)
+	if downloadURL == "" {
+		if result.Error != "" {
+			return nil, fmt.Errorf("spotubedl(%s) error: %s", engine, result.Error)
+		}
+		if result.Message != "" {
+			return nil, fmt.Errorf("spotubedl(%s) message: %s", engine, result.Message)
+		}
+		return nil, fmt.Errorf("no download URL from spotubedl(%s)", engine)
 	}
 
-	GoLog("[YouTube] Got download URL from SpotubeDL\n")
+	if strings.HasPrefix(downloadURL, "/") {
+		downloadURL = spotubeBaseURL + downloadURL
+	}
+
+	if !strings.HasPrefix(downloadURL, "http://") && !strings.HasPrefix(downloadURL, "https://") {
+		return nil, fmt.Errorf("invalid download URL from spotubedl(%s): %s", engine, downloadURL)
+	}
+
+	filename := strings.TrimSpace(result.Filename)
+	if filename == "" {
+		if parsedURL, parseErr := url.Parse(downloadURL); parseErr == nil {
+			if queryFilename := strings.TrimSpace(parsedURL.Query().Get("filename")); queryFilename != "" {
+				if decodedFilename, decodeErr := url.QueryUnescape(queryFilename); decodeErr == nil {
+					filename = decodedFilename
+				} else {
+					filename = queryFilename
+				}
+			}
+		}
+	}
+
+	GoLog("[YouTube] Got download URL from SpotubeDL (%s)\n", engine)
 	return &CobaltResponse{
-		Status: "tunnel",
-		URL:    result.URL,
+		Status:   "tunnel",
+		URL:      downloadURL,
+		Filename: filename,
 	}, nil
 }
 
@@ -411,15 +542,7 @@ func ExtractYouTubeVideoID(urlStr string) (string, error) {
 func downloadFromYouTube(req DownloadRequest) (YouTubeDownloadResult, error) {
 	downloader := NewYouTubeDownloader()
 
-	var quality YouTubeQuality
-	switch strings.ToLower(req.Quality) {
-	case "opus_256", "opus256", "opus":
-		quality = YouTubeQualityOpus256
-	case "mp3_320", "mp3320", "mp3":
-		quality = YouTubeQualityMP3320
-	default:
-		quality = YouTubeQualityMP3320 // Default to MP3 320kbps
-	}
+	format, bitrate, quality := parseYouTubeQualityInput(req.Quality)
 
 	// URL lookup priority: YouTube video ID > Spotify ID > Deezer ID > ISRC
 	var youtubeURL string
@@ -480,18 +603,23 @@ func downloadFromYouTube(req DownloadRequest) (YouTubeDownloadResult, error) {
 		return YouTubeDownloadResult{}, fmt.Errorf("failed to get download URL: %w", err)
 	}
 
-	var ext string
-	var format string
-	var bitrate int
-	switch quality {
-	case YouTubeQualityOpus256:
+	ext := ".mp3"
+	if format == "opus" {
 		ext = ".opus"
-		format = "opus"
-		bitrate = 256
-	case YouTubeQualityMP3320:
-		ext = ".mp3"
-		format = "mp3"
-		bitrate = 320
+	}
+
+	// Some SpotubeDL engines may return a different output container than requested.
+	// Respect the provider-reported filename to avoid saving MP3 bytes with .opus extension.
+	if cobaltResp != nil && cobaltResp.Filename != "" {
+		lowerName := strings.ToLower(strings.TrimSpace(cobaltResp.Filename))
+		switch {
+		case strings.HasSuffix(lowerName, ".mp3"):
+			ext = ".mp3"
+			format = "mp3"
+		case strings.HasSuffix(lowerName, ".opus"), strings.HasSuffix(lowerName, ".ogg"):
+			ext = ".opus"
+			format = "opus"
+		}
 	}
 
 	filename := buildFilenameFromTemplate(req.FilenameFormat, map[string]any{

go_backend/youtube_quality_test.go

@@ -0,0 +1,41 @@
+package gobackend
+
+import "testing"
+
+func TestParseYouTubeQualityInput_OpusNormalizesToSupportedBitrates(t *testing.T) {
+	format, bitrate, normalized := parseYouTubeQualityInput("opus_160")
+	if format != "opus" {
+		t.Fatalf("expected opus format, got %s", format)
+	}
+	if bitrate != 128 {
+		t.Fatalf("expected 128 bitrate, got %d", bitrate)
+	}
+	if normalized != YouTubeQualityOpus128 {
+		t.Fatalf("expected %s normalized, got %s", YouTubeQualityOpus128, normalized)
+	}
+}
+
+func TestParseYouTubeQualityInput_Mp3NormalizesToSupportedBitrates(t *testing.T) {
+	format, bitrate, normalized := parseYouTubeQualityInput("mp3_192")
+	if format != "mp3" {
+		t.Fatalf("expected mp3 format, got %s", format)
+	}
+	if bitrate != 256 {
+		t.Fatalf("expected 256 bitrate, got %d", bitrate)
+	}
+	if normalized != YouTubeQualityMP3256 {
+		t.Fatalf("expected %s normalized, got %s", YouTubeQualityMP3256, normalized)
+	}
+}
+
+func TestParseYouTubeQualityInput_PicksNearestSupportedBitrate(t *testing.T) {
+	_, opusBitrate, _ := parseYouTubeQualityInput("opus_999")
+	if opusBitrate != 256 {
+		t.Fatalf("expected opus normalization to 256, got %d", opusBitrate)
+	}
+
+	_, mp3Bitrate, _ := parseYouTubeQualityInput("mp3_1")
+	if mp3Bitrate != 128 {
+		t.Fatalf("expected mp3 normalization to 128, got %d", mp3Bitrate)
+	}
+}

ios/Runner/AppDelegate.swift

@@ -191,6 +191,17 @@ import Gobackend  // Import Go framework
             let response = GobackendGetLyricsLRC(spotifyId, trackName, artistName, filePath, durationMs, &error)
             if let error = error { throw error }
             return response
+
+        case "getLyricsLRCWithSource":
+            let args = call.arguments as! [String: Any]
+            let spotifyId = args["spotify_id"] as! String
+            let trackName = args["track_name"] as! String
+            let artistName = args["artist_name"] as! String
+            let filePath = args["file_path"] as? String ?? ""
+            let durationMs = args["duration_ms"] as? Int64 ?? 0
+            let response = GobackendGetLyricsLRCWithSource(spotifyId, trackName, artistName, filePath, durationMs, &error)
+            if let error = error { throw error }
+            return response
             
         case "embedLyricsToFile":
             let args = call.arguments as! [String: Any]
@@ -783,6 +794,36 @@ import Gobackend  // Import Go framework
             if let error = error { throw error }
             return response
             
+        // Lyrics Provider Settings
+        case "setLyricsProviders":
+            let args = call.arguments as! [String: Any]
+            let providersJson = args["providers_json"] as? String ?? "[]"
+            GobackendSetLyricsProvidersJSON(providersJson, &error)
+            if let error = error { throw error }
+            return "{\"success\":true}"
+            
+        case "getLyricsProviders":
+            let response = GobackendGetLyricsProvidersJSON(&error)
+            if let error = error { throw error }
+            return response
+            
+        case "getAvailableLyricsProviders":
+            let response = GobackendGetAvailableLyricsProvidersJSON(&error)
+            if let error = error { throw error }
+            return response
+            
+        case "setLyricsFetchOptions":
+            let args = call.arguments as! [String: Any]
+            let optionsJson = args["options_json"] as? String ?? "{}"
+            GobackendSetLyricsFetchOptionsJSON(optionsJson, &error)
+            if let error = error { throw error }
+            return "{\"success\":true}"
+            
+        case "getLyricsFetchOptions":
+            let response = GobackendGetLyricsFetchOptionsJSON(&error)
+            if let error = error { throw error }
+            return response
+            
         default:
             throw NSError(
                 domain: "SpotiFLAC",

lib/constants/app_info.dart

@@ -1,8 +1,8 @@
 /// App version and info constants
 /// Update version here only - all other files will reference this
 class AppInfo {
-  static const String version = '3.6.7';
-  static const String buildNumber = '81';
+  static const String version = '3.6.9';
+  static const String buildNumber = '82';
   static const String fullVersion = '$version+$buildNumber';
   
   

lib/l10n/app_localizations.dart

@@ -3508,6 +3508,42 @@ abstract class AppLocalizations {
   /// **'YouTube provides lossy audio only. Not part of lossless fallback.'**
   String get youtubeQualityNote;
 
+  /// Title for YouTube Opus bitrate setting
+  ///
+  /// In en, this message translates to:
+  /// **'YouTube Opus Bitrate'**
+  String get youtubeOpusBitrateTitle;
+
+  /// Title for YouTube MP3 bitrate setting
+  ///
+  /// In en, this message translates to:
+  /// **'YouTube MP3 Bitrate'**
+  String get youtubeMp3BitrateTitle;
+
+  /// Subtitle showing current bitrate and valid range
+  ///
+  /// In en, this message translates to:
+  /// **'{bitrate}kbps ({min}-{max})'**
+  String youtubeBitrateSubtitle(int bitrate, int min, int max);
+
+  /// Helper text for manual YouTube bitrate input
+  ///
+  /// In en, this message translates to:
+  /// **'Enter custom bitrate ({min}-{max} kbps)'**
+  String youtubeBitrateInputHelp(int min, int max);
+
+  /// Label for YouTube bitrate input field
+  ///
+  /// In en, this message translates to:
+  /// **'Bitrate (kbps)'**
+  String get youtubeBitrateFieldLabel;
+
+  /// Validation error for invalid YouTube bitrate input
+  ///
+  /// In en, this message translates to:
+  /// **'Bitrate must be between {min} and {max} kbps'**
+  String youtubeBitrateValidationError(int min, int max);
+
   /// Setting - show quality picker
   ///
   /// In en, this message translates to:

lib/l10n/app_localizations_de.dart

@@ -1944,6 +1944,30 @@ class AppLocalizationsDe extends AppLocalizations {
   String get youtubeQualityNote =>
       'YouTube provides lossy audio only. Not part of lossless fallback.';
 
+  @override
+  String get youtubeOpusBitrateTitle => 'YouTube Opus Bitrate';
+
+  @override
+  String get youtubeMp3BitrateTitle => 'YouTube MP3 Bitrate';
+
+  @override
+  String youtubeBitrateSubtitle(int bitrate, int min, int max) {
+    return '${bitrate}kbps ($min-$max)';
+  }
+
+  @override
+  String youtubeBitrateInputHelp(int min, int max) {
+    return 'Enter custom bitrate ($min-$max kbps)';
+  }
+
+  @override
+  String get youtubeBitrateFieldLabel => 'Bitrate (kbps)';
+
+  @override
+  String youtubeBitrateValidationError(int min, int max) {
+    return 'Bitrate must be between $min and $max kbps';
+  }
+
   @override
   String get downloadAskBeforeDownload => 'Ask Before Download';
 

lib/l10n/app_localizations_en.dart

@@ -1923,6 +1923,30 @@ class AppLocalizationsEn extends AppLocalizations {
   String get youtubeQualityNote =>
       'YouTube provides lossy audio only. Not part of lossless fallback.';
 
+  @override
+  String get youtubeOpusBitrateTitle => 'YouTube Opus Bitrate';
+
+  @override
+  String get youtubeMp3BitrateTitle => 'YouTube MP3 Bitrate';
+
+  @override
+  String youtubeBitrateSubtitle(int bitrate, int min, int max) {
+    return '${bitrate}kbps ($min-$max)';
+  }
+
+  @override
+  String youtubeBitrateInputHelp(int min, int max) {
+    return 'Enter custom bitrate ($min-$max kbps)';
+  }
+
+  @override
+  String get youtubeBitrateFieldLabel => 'Bitrate (kbps)';
+
+  @override
+  String youtubeBitrateValidationError(int min, int max) {
+    return 'Bitrate must be between $min and $max kbps';
+  }
+
   @override
   String get downloadAskBeforeDownload => 'Ask Before Download';
 

lib/l10n/app_localizations_es.dart

@@ -1923,6 +1923,30 @@ class AppLocalizationsEs extends AppLocalizations {
   String get youtubeQualityNote =>
       'YouTube provides lossy audio only. Not part of lossless fallback.';
 
+  @override
+  String get youtubeOpusBitrateTitle => 'YouTube Opus Bitrate';
+
+  @override
+  String get youtubeMp3BitrateTitle => 'YouTube MP3 Bitrate';
+
+  @override
+  String youtubeBitrateSubtitle(int bitrate, int min, int max) {
+    return '${bitrate}kbps ($min-$max)';
+  }
+
+  @override
+  String youtubeBitrateInputHelp(int min, int max) {
+    return 'Enter custom bitrate ($min-$max kbps)';
+  }
+
+  @override
+  String get youtubeBitrateFieldLabel => 'Bitrate (kbps)';
+
+  @override
+  String youtubeBitrateValidationError(int min, int max) {
+    return 'Bitrate must be between $min and $max kbps';
+  }
+
   @override
   String get downloadAskBeforeDownload => 'Ask Before Download';
 

lib/l10n/app_localizations_fr.dart

@@ -1929,6 +1929,30 @@ class AppLocalizationsFr extends AppLocalizations {
   String get youtubeQualityNote =>
       'YouTube provides lossy audio only. Not part of lossless fallback.';
 
+  @override
+  String get youtubeOpusBitrateTitle => 'YouTube Opus Bitrate';
+
+  @override
+  String get youtubeMp3BitrateTitle => 'YouTube MP3 Bitrate';
+
+  @override
+  String youtubeBitrateSubtitle(int bitrate, int min, int max) {
+    return '${bitrate}kbps ($min-$max)';
+  }
+
+  @override
+  String youtubeBitrateInputHelp(int min, int max) {
+    return 'Enter custom bitrate ($min-$max kbps)';
+  }
+
+  @override
+  String get youtubeBitrateFieldLabel => 'Bitrate (kbps)';
+
+  @override
+  String youtubeBitrateValidationError(int min, int max) {
+    return 'Bitrate must be between $min and $max kbps';
+  }
+
   @override
   String get downloadAskBeforeDownload => 'Ask Before Download';
 

lib/l10n/app_localizations_hi.dart

@@ -1923,6 +1923,30 @@ class AppLocalizationsHi extends AppLocalizations {
   String get youtubeQualityNote =>
       'YouTube provides lossy audio only. Not part of lossless fallback.';
 
+  @override
+  String get youtubeOpusBitrateTitle => 'YouTube Opus Bitrate';
+
+  @override
+  String get youtubeMp3BitrateTitle => 'YouTube MP3 Bitrate';
+
+  @override
+  String youtubeBitrateSubtitle(int bitrate, int min, int max) {
+    return '${bitrate}kbps ($min-$max)';
+  }
+
+  @override
+  String youtubeBitrateInputHelp(int min, int max) {
+    return 'Enter custom bitrate ($min-$max kbps)';
+  }
+
+  @override
+  String get youtubeBitrateFieldLabel => 'Bitrate (kbps)';
+
+  @override
+  String youtubeBitrateValidationError(int min, int max) {
+    return 'Bitrate must be between $min and $max kbps';
+  }
+
   @override
   String get downloadAskBeforeDownload => 'Ask Before Download';
 

lib/l10n/app_localizations_id.dart

@@ -1935,6 +1935,30 @@ class AppLocalizationsId extends AppLocalizations {
   String get youtubeQualityNote =>
       'YouTube provides lossy audio only. Not part of lossless fallback.';
 
+  @override
+  String get youtubeOpusBitrateTitle => 'Bitrate Opus YouTube';
+
+  @override
+  String get youtubeMp3BitrateTitle => 'Bitrate MP3 YouTube';
+
+  @override
+  String youtubeBitrateSubtitle(int bitrate, int min, int max) {
+    return '${bitrate}kbps ($min-$max)';
+  }
+
+  @override
+  String youtubeBitrateInputHelp(int min, int max) {
+    return 'Masukkan bitrate manual ($min-$max kbps)';
+  }
+
+  @override
+  String get youtubeBitrateFieldLabel => 'Bitrate (kbps)';
+
+  @override
+  String youtubeBitrateValidationError(int min, int max) {
+    return 'Bitrate harus antara $min dan $max kbps';
+  }
+
   @override
   String get downloadAskBeforeDownload => 'Tanya Sebelum Unduh';
 

lib/l10n/app_localizations_ja.dart

@@ -1911,6 +1911,30 @@ class AppLocalizationsJa extends AppLocalizations {
   String get youtubeQualityNote =>
       'YouTube provides lossy audio only. Not part of lossless fallback.';
 
+  @override
+  String get youtubeOpusBitrateTitle => 'YouTube Opus Bitrate';
+
+  @override
+  String get youtubeMp3BitrateTitle => 'YouTube MP3 Bitrate';
+
+  @override
+  String youtubeBitrateSubtitle(int bitrate, int min, int max) {
+    return '${bitrate}kbps ($min-$max)';
+  }
+
+  @override
+  String youtubeBitrateInputHelp(int min, int max) {
+    return 'Enter custom bitrate ($min-$max kbps)';
+  }
+
+  @override
+  String get youtubeBitrateFieldLabel => 'Bitrate (kbps)';
+
+  @override
+  String youtubeBitrateValidationError(int min, int max) {
+    return 'Bitrate must be between $min and $max kbps';
+  }
+
   @override
   String get downloadAskBeforeDownload => 'ダウンロード前に確認する';
 

lib/l10n/app_localizations_ko.dart

@@ -1922,6 +1922,30 @@ class AppLocalizationsKo extends AppLocalizations {
   String get youtubeQualityNote =>
       'YouTube provides lossy audio only. Not part of lossless fallback.';
 
+  @override
+  String get youtubeOpusBitrateTitle => 'YouTube Opus Bitrate';
+
+  @override
+  String get youtubeMp3BitrateTitle => 'YouTube MP3 Bitrate';
+
+  @override
+  String youtubeBitrateSubtitle(int bitrate, int min, int max) {
+    return '${bitrate}kbps ($min-$max)';
+  }
+
+  @override
+  String youtubeBitrateInputHelp(int min, int max) {
+    return 'Enter custom bitrate ($min-$max kbps)';
+  }
+
+  @override
+  String get youtubeBitrateFieldLabel => 'Bitrate (kbps)';
+
+  @override
+  String youtubeBitrateValidationError(int min, int max) {
+    return 'Bitrate must be between $min and $max kbps';
+  }
+
   @override
   String get downloadAskBeforeDownload => 'Ask Before Download';
 

lib/l10n/app_localizations_nl.dart

@@ -1923,6 +1923,30 @@ class AppLocalizationsNl extends AppLocalizations {
   String get youtubeQualityNote =>
       'YouTube provides lossy audio only. Not part of lossless fallback.';
 
+  @override
+  String get youtubeOpusBitrateTitle => 'YouTube Opus Bitrate';
+
+  @override
+  String get youtubeMp3BitrateTitle => 'YouTube MP3 Bitrate';
+
+  @override
+  String youtubeBitrateSubtitle(int bitrate, int min, int max) {
+    return '${bitrate}kbps ($min-$max)';
+  }
+
+  @override
+  String youtubeBitrateInputHelp(int min, int max) {
+    return 'Enter custom bitrate ($min-$max kbps)';
+  }
+
+  @override
+  String get youtubeBitrateFieldLabel => 'Bitrate (kbps)';
+
+  @override
+  String youtubeBitrateValidationError(int min, int max) {
+    return 'Bitrate must be between $min and $max kbps';
+  }
+
   @override
   String get downloadAskBeforeDownload => 'Ask Before Download';
 

lib/l10n/app_localizations_pt.dart

@@ -1923,6 +1923,30 @@ class AppLocalizationsPt extends AppLocalizations {
   String get youtubeQualityNote =>
       'YouTube provides lossy audio only. Not part of lossless fallback.';
 
+  @override
+  String get youtubeOpusBitrateTitle => 'YouTube Opus Bitrate';
+
+  @override
+  String get youtubeMp3BitrateTitle => 'YouTube MP3 Bitrate';
+
+  @override
+  String youtubeBitrateSubtitle(int bitrate, int min, int max) {
+    return '${bitrate}kbps ($min-$max)';
+  }
+
+  @override
+  String youtubeBitrateInputHelp(int min, int max) {
+    return 'Enter custom bitrate ($min-$max kbps)';
+  }
+
+  @override
+  String get youtubeBitrateFieldLabel => 'Bitrate (kbps)';
+
+  @override
+  String youtubeBitrateValidationError(int min, int max) {
+    return 'Bitrate must be between $min and $max kbps';
+  }
+
   @override
   String get downloadAskBeforeDownload => 'Ask Before Download';
 

lib/l10n/app_localizations_ru.dart

@@ -1963,6 +1963,30 @@ class AppLocalizationsRu extends AppLocalizations {
   String get youtubeQualityNote =>
       'YouTube обеспечивает только звук с потерями(Lossy).';
 
+  @override
+  String get youtubeOpusBitrateTitle => 'YouTube Opus Bitrate';
+
+  @override
+  String get youtubeMp3BitrateTitle => 'YouTube MP3 Bitrate';
+
+  @override
+  String youtubeBitrateSubtitle(int bitrate, int min, int max) {
+    return '${bitrate}kbps ($min-$max)';
+  }
+
+  @override
+  String youtubeBitrateInputHelp(int min, int max) {
+    return 'Enter custom bitrate ($min-$max kbps)';
+  }
+
+  @override
+  String get youtubeBitrateFieldLabel => 'Bitrate (kbps)';
+
+  @override
+  String youtubeBitrateValidationError(int min, int max) {
+    return 'Bitrate must be between $min and $max kbps';
+  }
+
   @override
   String get downloadAskBeforeDownload => 'Спрашивать перед скачиванием';
 

lib/l10n/app_localizations_tr.dart

@@ -1938,6 +1938,30 @@ class AppLocalizationsTr extends AppLocalizations {
   String get youtubeQualityNote =>
       'YouTube provides lossy audio only. Not part of lossless fallback.';
 
+  @override
+  String get youtubeOpusBitrateTitle => 'YouTube Opus Bitrate';
+
+  @override
+  String get youtubeMp3BitrateTitle => 'YouTube MP3 Bitrate';
+
+  @override
+  String youtubeBitrateSubtitle(int bitrate, int min, int max) {
+    return '${bitrate}kbps ($min-$max)';
+  }
+
+  @override
+  String youtubeBitrateInputHelp(int min, int max) {
+    return 'Enter custom bitrate ($min-$max kbps)';
+  }
+
+  @override
+  String get youtubeBitrateFieldLabel => 'Bitrate (kbps)';
+
+  @override
+  String youtubeBitrateValidationError(int min, int max) {
+    return 'Bitrate must be between $min and $max kbps';
+  }
+
   @override
   String get downloadAskBeforeDownload => 'Ask Before Download';
 

lib/l10n/app_localizations_zh.dart

@@ -1923,6 +1923,30 @@ class AppLocalizationsZh extends AppLocalizations {
   String get youtubeQualityNote =>
       'YouTube provides lossy audio only. Not part of lossless fallback.';
 
+  @override
+  String get youtubeOpusBitrateTitle => 'YouTube Opus Bitrate';
+
+  @override
+  String get youtubeMp3BitrateTitle => 'YouTube MP3 Bitrate';
+
+  @override
+  String youtubeBitrateSubtitle(int bitrate, int min, int max) {
+    return '${bitrate}kbps ($min-$max)';
+  }
+
+  @override
+  String youtubeBitrateInputHelp(int min, int max) {
+    return 'Enter custom bitrate ($min-$max kbps)';
+  }
+
+  @override
+  String get youtubeBitrateFieldLabel => 'Bitrate (kbps)';
+
+  @override
+  String youtubeBitrateValidationError(int min, int max) {
+    return 'Bitrate must be between $min and $max kbps';
+  }
+
   @override
   String get downloadAskBeforeDownload => 'Ask Before Download';
 

lib/l10n/arb/app_en.arb

@@ -1420,6 +1420,37 @@
   "@qualityNote": {"description": "Note about quality availability"},
   "youtubeQualityNote": "YouTube provides lossy audio only. Not part of lossless fallback.",
   "@youtubeQualityNote": {"description": "Note for YouTube service explaining lossy-only quality"},
+  "youtubeOpusBitrateTitle": "YouTube Opus Bitrate",
+  "@youtubeOpusBitrateTitle": {"description": "Title for YouTube Opus bitrate setting"},
+  "youtubeMp3BitrateTitle": "YouTube MP3 Bitrate",
+  "@youtubeMp3BitrateTitle": {"description": "Title for YouTube MP3 bitrate setting"},
+  "youtubeBitrateSubtitle": "{bitrate}kbps ({min}-{max})",
+  "@youtubeBitrateSubtitle": {
+    "description": "Subtitle showing current bitrate and valid range",
+    "placeholders": {
+      "bitrate": {"type": "int"},
+      "min": {"type": "int"},
+      "max": {"type": "int"}
+    }
+  },
+  "youtubeBitrateInputHelp": "Enter custom bitrate ({min}-{max} kbps)",
+  "@youtubeBitrateInputHelp": {
+    "description": "Helper text for manual YouTube bitrate input",
+    "placeholders": {
+      "min": {"type": "int"},
+      "max": {"type": "int"}
+    }
+  },
+  "youtubeBitrateFieldLabel": "Bitrate (kbps)",
+  "@youtubeBitrateFieldLabel": {"description": "Label for YouTube bitrate input field"},
+  "youtubeBitrateValidationError": "Bitrate must be between {min} and {max} kbps",
+  "@youtubeBitrateValidationError": {
+    "description": "Validation error for invalid YouTube bitrate input",
+    "placeholders": {
+      "min": {"type": "int"},
+      "max": {"type": "int"}
+    }
+  },
 
   "downloadAskBeforeDownload": "Ask Before Download",
   "@downloadAskBeforeDownload": {"description": "Setting - show quality picker"},

lib/l10n/arb/app_id.arb

@@ -2498,18 +2498,69 @@
   "@lossyFormatOpusSubtitle": {
     "description": "Opus format description"
   },
-  "qualityNote": "Kualitas sebenarnya tergantung ketersediaan lagu dari layanan",
-  "@qualityNote": {
-    "description": "Note about quality availability"
-  },
-  "youtubeQualityNote": "YouTube provides lossy audio only. Not part of lossless fallback.",
-  "@youtubeQualityNote": {
-    "description": "Note for YouTube service explaining lossy-only quality"
-  },
-  "downloadAskBeforeDownload": "Tanya Sebelum Unduh",
-  "@downloadAskBeforeDownload": {
-    "description": "Setting - show quality picker"
-  },
+  "qualityNote": "Kualitas sebenarnya tergantung ketersediaan lagu dari layanan",
+  "@qualityNote": {
+    "description": "Note about quality availability"
+  },
+  "youtubeQualityNote": "YouTube provides lossy audio only. Not part of lossless fallback.",
+  "@youtubeQualityNote": {
+    "description": "Note for YouTube service explaining lossy-only quality"
+  },
+  "youtubeOpusBitrateTitle": "Bitrate Opus YouTube",
+  "@youtubeOpusBitrateTitle": {
+    "description": "Title for YouTube Opus bitrate setting"
+  },
+  "youtubeMp3BitrateTitle": "Bitrate MP3 YouTube",
+  "@youtubeMp3BitrateTitle": {
+    "description": "Title for YouTube MP3 bitrate setting"
+  },
+  "youtubeBitrateSubtitle": "{bitrate}kbps ({min}-{max})",
+  "@youtubeBitrateSubtitle": {
+    "description": "Subtitle showing current bitrate and valid range",
+    "placeholders": {
+      "bitrate": {
+        "type": "int"
+      },
+      "min": {
+        "type": "int"
+      },
+      "max": {
+        "type": "int"
+      }
+    }
+  },
+  "youtubeBitrateInputHelp": "Masukkan bitrate manual ({min}-{max} kbps)",
+  "@youtubeBitrateInputHelp": {
+    "description": "Helper text for manual YouTube bitrate input",
+    "placeholders": {
+      "min": {
+        "type": "int"
+      },
+      "max": {
+        "type": "int"
+      }
+    }
+  },
+  "youtubeBitrateFieldLabel": "Bitrate (kbps)",
+  "@youtubeBitrateFieldLabel": {
+    "description": "Label for YouTube bitrate input field"
+  },
+  "youtubeBitrateValidationError": "Bitrate harus antara {min} dan {max} kbps",
+  "@youtubeBitrateValidationError": {
+    "description": "Validation error for invalid YouTube bitrate input",
+    "placeholders": {
+      "min": {
+        "type": "int"
+      },
+      "max": {
+        "type": "int"
+      }
+    }
+  },
+  "downloadAskBeforeDownload": "Tanya Sebelum Unduh",
+  "@downloadAskBeforeDownload": {
+    "description": "Setting - show quality picker"
+  },
   "downloadDirectory": "Direktori Unduhan",
   "@downloadDirectory": {
     "description": "Setting - download folder"

lib/models/settings.dart

@@ -39,6 +39,10 @@ class AppSettings {
   final String lyricsMode;
   final String
   tidalHighFormat; // Format for Tidal HIGH quality: 'mp3_320', 'opus_256', or 'opus_128'
+  final int
+  youtubeOpusBitrate; // YouTube Opus bitrate (supported: 128/256 kbps)
+  final int
+  youtubeMp3Bitrate; // YouTube MP3 bitrate (supported: 128/256/320 kbps)
   final bool
   useAllFilesAccess; // Android 13+ only: enable MANAGE_EXTERNAL_STORAGE
   final bool
@@ -56,6 +60,18 @@ class AppSettings {
   final bool
   hasCompletedTutorial; // Track if user has completed the app tutorial
 
+  // Lyrics Provider Settings
+  final List<String>
+  lyricsProviders; // Ordered list of enabled lyrics provider IDs
+  final bool
+  lyricsIncludeTranslationNetease; // Append translated lyrics (Netease)
+  final bool
+  lyricsIncludeRomanizationNetease; // Append romanized lyrics (Netease)
+  final bool
+  lyricsMultiPersonWordByWord; // Enable v1/v2 + [bg:] tags for Apple/QQ syllable lyrics
+  final String
+  musixmatchLanguage; // Optional ISO language code for Musixmatch localized lyrics
+
   const AppSettings({
     this.defaultService = 'tidal',
     this.audioQuality = 'LOSSLESS',
@@ -91,6 +107,8 @@ class AppSettings {
     this.locale = 'system',
     this.lyricsMode = 'embed',
     this.tidalHighFormat = 'mp3_320',
+    this.youtubeOpusBitrate = 256,
+    this.youtubeMp3Bitrate = 320,
     this.useAllFilesAccess = false,
     this.autoExportFailedDownloads = false,
     this.downloadNetworkMode = 'any',
@@ -100,6 +118,18 @@ class AppSettings {
     this.localLibraryShowDuplicates = true,
     // Tutorial default
     this.hasCompletedTutorial = false,
+    // Lyrics providers default order
+    this.lyricsProviders = const [
+      'lrclib',
+      'musixmatch',
+      'netease',
+      'apple_music',
+      'qqmusic',
+    ],
+    this.lyricsIncludeTranslationNetease = false,
+    this.lyricsIncludeRomanizationNetease = false,
+    this.lyricsMultiPersonWordByWord = false,
+    this.musixmatchLanguage = '',
   });
 
   AppSettings copyWith({
@@ -138,6 +168,8 @@ class AppSettings {
     String? locale,
     String? lyricsMode,
     String? tidalHighFormat,
+    int? youtubeOpusBitrate,
+    int? youtubeMp3Bitrate,
     bool? useAllFilesAccess,
     bool? autoExportFailedDownloads,
     String? downloadNetworkMode,
@@ -147,6 +179,12 @@ class AppSettings {
     bool? localLibraryShowDuplicates,
     // Tutorial
     bool? hasCompletedTutorial,
+    // Lyrics providers
+    List<String>? lyricsProviders,
+    bool? lyricsIncludeTranslationNetease,
+    bool? lyricsIncludeRomanizationNetease,
+    bool? lyricsMultiPersonWordByWord,
+    String? musixmatchLanguage,
   }) {
     return AppSettings(
       defaultService: defaultService ?? this.defaultService,
@@ -191,6 +229,8 @@ class AppSettings {
       locale: locale ?? this.locale,
       lyricsMode: lyricsMode ?? this.lyricsMode,
       tidalHighFormat: tidalHighFormat ?? this.tidalHighFormat,
+      youtubeOpusBitrate: youtubeOpusBitrate ?? this.youtubeOpusBitrate,
+      youtubeMp3Bitrate: youtubeMp3Bitrate ?? this.youtubeMp3Bitrate,
       useAllFilesAccess: useAllFilesAccess ?? this.useAllFilesAccess,
       autoExportFailedDownloads:
           autoExportFailedDownloads ?? this.autoExportFailedDownloads,
@@ -202,6 +242,17 @@ class AppSettings {
           localLibraryShowDuplicates ?? this.localLibraryShowDuplicates,
       // Tutorial
       hasCompletedTutorial: hasCompletedTutorial ?? this.hasCompletedTutorial,
+      // Lyrics providers
+      lyricsProviders: lyricsProviders ?? this.lyricsProviders,
+      lyricsIncludeTranslationNetease:
+          lyricsIncludeTranslationNetease ??
+          this.lyricsIncludeTranslationNetease,
+      lyricsIncludeRomanizationNetease:
+          lyricsIncludeRomanizationNetease ??
+          this.lyricsIncludeRomanizationNetease,
+      lyricsMultiPersonWordByWord:
+          lyricsMultiPersonWordByWord ?? this.lyricsMultiPersonWordByWord,
+      musixmatchLanguage: musixmatchLanguage ?? this.musixmatchLanguage,
     );
   }
 

lib/models/settings.g.dart

@@ -44,6 +44,8 @@ AppSettings _$AppSettingsFromJson(Map<String, dynamic> json) => AppSettings(
   locale: json['locale'] as String? ?? 'system',
   lyricsMode: json['lyricsMode'] as String? ?? 'embed',
   tidalHighFormat: json['tidalHighFormat'] as String? ?? 'mp3_320',
+  youtubeOpusBitrate: (json['youtubeOpusBitrate'] as num?)?.toInt() ?? 256,
+  youtubeMp3Bitrate: (json['youtubeMp3Bitrate'] as num?)?.toInt() ?? 320,
   useAllFilesAccess: json['useAllFilesAccess'] as bool? ?? false,
   autoExportFailedDownloads:
       json['autoExportFailedDownloads'] as bool? ?? false,
@@ -53,50 +55,70 @@ AppSettings _$AppSettingsFromJson(Map<String, dynamic> json) => AppSettings(
   localLibraryShowDuplicates:
       json['localLibraryShowDuplicates'] as bool? ?? true,
   hasCompletedTutorial: json['hasCompletedTutorial'] as bool? ?? false,
+  lyricsProviders:
+      (json['lyricsProviders'] as List<dynamic>?)
+          ?.map((e) => e as String)
+          .toList() ??
+      const ['lrclib', 'musixmatch', 'netease', 'apple_music', 'qqmusic'],
+  lyricsIncludeTranslationNetease:
+      json['lyricsIncludeTranslationNetease'] as bool? ?? false,
+  lyricsIncludeRomanizationNetease:
+      json['lyricsIncludeRomanizationNetease'] as bool? ?? false,
+  lyricsMultiPersonWordByWord:
+      json['lyricsMultiPersonWordByWord'] as bool? ?? false,
+  musixmatchLanguage: json['musixmatchLanguage'] as String? ?? '',
 );
 
-Map<String, dynamic> _$AppSettingsToJson(AppSettings instance) =>
-    <String, dynamic>{
-      'defaultService': instance.defaultService,
-      'audioQuality': instance.audioQuality,
-      'filenameFormat': instance.filenameFormat,
-      'downloadDirectory': instance.downloadDirectory,
-      'storageMode': instance.storageMode,
-      'downloadTreeUri': instance.downloadTreeUri,
-      'autoFallback': instance.autoFallback,
-      'embedLyrics': instance.embedLyrics,
-      'maxQualityCover': instance.maxQualityCover,
-      'isFirstLaunch': instance.isFirstLaunch,
-      'concurrentDownloads': instance.concurrentDownloads,
-      'checkForUpdates': instance.checkForUpdates,
-      'updateChannel': instance.updateChannel,
-      'hasSearchedBefore': instance.hasSearchedBefore,
-      'folderOrganization': instance.folderOrganization,
-      'useAlbumArtistForFolders': instance.useAlbumArtistForFolders,
-      'usePrimaryArtistOnly': instance.usePrimaryArtistOnly,
-      'filterContributingArtistsInAlbumArtist':
-          instance.filterContributingArtistsInAlbumArtist,
-      'historyViewMode': instance.historyViewMode,
-      'historyFilterMode': instance.historyFilterMode,
-      'askQualityBeforeDownload': instance.askQualityBeforeDownload,
-      'spotifyClientId': instance.spotifyClientId,
-      'spotifyClientSecret': instance.spotifyClientSecret,
-      'useCustomSpotifyCredentials': instance.useCustomSpotifyCredentials,
-      'metadataSource': instance.metadataSource,
-      'enableLogging': instance.enableLogging,
-      'useExtensionProviders': instance.useExtensionProviders,
-      'searchProvider': instance.searchProvider,
-      'separateSingles': instance.separateSingles,
-      'albumFolderStructure': instance.albumFolderStructure,
-      'showExtensionStore': instance.showExtensionStore,
-      'locale': instance.locale,
-      'lyricsMode': instance.lyricsMode,
-      'tidalHighFormat': instance.tidalHighFormat,
-      'useAllFilesAccess': instance.useAllFilesAccess,
-      'autoExportFailedDownloads': instance.autoExportFailedDownloads,
-      'downloadNetworkMode': instance.downloadNetworkMode,
-      'localLibraryEnabled': instance.localLibraryEnabled,
-      'localLibraryPath': instance.localLibraryPath,
-      'localLibraryShowDuplicates': instance.localLibraryShowDuplicates,
-      'hasCompletedTutorial': instance.hasCompletedTutorial,
-    };
+Map<String, dynamic> _$AppSettingsToJson(
+  AppSettings instance,
+) => <String, dynamic>{
+  'defaultService': instance.defaultService,
+  'audioQuality': instance.audioQuality,
+  'filenameFormat': instance.filenameFormat,
+  'downloadDirectory': instance.downloadDirectory,
+  'storageMode': instance.storageMode,
+  'downloadTreeUri': instance.downloadTreeUri,
+  'autoFallback': instance.autoFallback,
+  'embedLyrics': instance.embedLyrics,
+  'maxQualityCover': instance.maxQualityCover,
+  'isFirstLaunch': instance.isFirstLaunch,
+  'concurrentDownloads': instance.concurrentDownloads,
+  'checkForUpdates': instance.checkForUpdates,
+  'updateChannel': instance.updateChannel,
+  'hasSearchedBefore': instance.hasSearchedBefore,
+  'folderOrganization': instance.folderOrganization,
+  'useAlbumArtistForFolders': instance.useAlbumArtistForFolders,
+  'usePrimaryArtistOnly': instance.usePrimaryArtistOnly,
+  'filterContributingArtistsInAlbumArtist':
+      instance.filterContributingArtistsInAlbumArtist,
+  'historyViewMode': instance.historyViewMode,
+  'historyFilterMode': instance.historyFilterMode,
+  'askQualityBeforeDownload': instance.askQualityBeforeDownload,
+  'spotifyClientId': instance.spotifyClientId,
+  'spotifyClientSecret': instance.spotifyClientSecret,
+  'useCustomSpotifyCredentials': instance.useCustomSpotifyCredentials,
+  'metadataSource': instance.metadataSource,
+  'enableLogging': instance.enableLogging,
+  'useExtensionProviders': instance.useExtensionProviders,
+  'searchProvider': instance.searchProvider,
+  'separateSingles': instance.separateSingles,
+  'albumFolderStructure': instance.albumFolderStructure,
+  'showExtensionStore': instance.showExtensionStore,
+  'locale': instance.locale,
+  'lyricsMode': instance.lyricsMode,
+  'tidalHighFormat': instance.tidalHighFormat,
+  'youtubeOpusBitrate': instance.youtubeOpusBitrate,
+  'youtubeMp3Bitrate': instance.youtubeMp3Bitrate,
+  'useAllFilesAccess': instance.useAllFilesAccess,
+  'autoExportFailedDownloads': instance.autoExportFailedDownloads,
+  'downloadNetworkMode': instance.downloadNetworkMode,
+  'localLibraryEnabled': instance.localLibraryEnabled,
+  'localLibraryPath': instance.localLibraryPath,
+  'localLibraryShowDuplicates': instance.localLibraryShowDuplicates,
+  'hasCompletedTutorial': instance.hasCompletedTutorial,
+  'lyricsProviders': instance.lyricsProviders,
+  'lyricsIncludeTranslationNetease': instance.lyricsIncludeTranslationNetease,
+  'lyricsIncludeRomanizationNetease': instance.lyricsIncludeRomanizationNetease,
+  'lyricsMultiPersonWordByWord': instance.lyricsMultiPersonWordByWord,
+  'musixmatchLanguage': instance.musixmatchLanguage,
+};

lib/providers/download_queue_provider.dart

@@ -2771,7 +2771,29 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
         settings,
       );
 
-      final quality = item.qualityOverride ?? state.audioQuality;
+      var quality = item.qualityOverride ?? state.audioQuality;
+      if (item.service.toLowerCase() == 'youtube') {
+        final normalized = quality.toLowerCase();
+        final isYoutubeQuality =
+            normalized.startsWith('mp3_') || normalized.startsWith('opus_');
+        if (!isYoutubeQuality) {
+          final mp3Bitrate = (() {
+            const supported = [128, 256, 320];
+            var nearest = supported.first;
+            var nearestDistance = (settings.youtubeMp3Bitrate - nearest).abs();
+            for (final option in supported.skip(1)) {
+              final distance = (settings.youtubeMp3Bitrate - option).abs();
+              if (distance < nearestDistance ||
+                  (distance == nearestDistance && option > nearest)) {
+                nearest = option;
+                nearestDistance = distance;
+              }
+            }
+            return nearest;
+          })();
+          quality = 'mp3_$mp3Bitrate';
+        }
+      }
       final isSafMode = _isSafMode(settings);
       final relativeOutputDir = isSafMode
           ? await _buildRelativeOutputDir(
@@ -3032,8 +3054,7 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
           outputDir: outputDir,
           filenameFormat: state.filenameFormat,
           quality: quality,
-          // Keep prior behavior: non-YouTube paths were implicitly true.
-          embedLyrics: isYouTube ? settings.embedLyrics : true,
+          embedLyrics: settings.embedLyrics,
           embedMaxQualityCover: settings.maxQualityCover,
           trackNumber: normalizedTrackNumber,
           discNumber: normalizedDiscNumber,

lib/providers/extension_provider.dart

@@ -26,6 +26,7 @@ class Extension {
   final List<QualityOption> qualityOptions;
   final bool hasMetadataProvider;
   final bool hasDownloadProvider;
+  final bool hasLyricsProvider;
   final bool skipMetadataEnrichment; // If true, use metadata from extension instead of enriching
   final SearchBehavior? searchBehavior;
   final URLHandler? urlHandler;
@@ -49,6 +50,7 @@ class Extension {
     this.qualityOptions = const [],
     this.hasMetadataProvider = false,
     this.hasDownloadProvider = false,
+    this.hasLyricsProvider = false,
     this.skipMetadataEnrichment = false,
     this.searchBehavior,
     this.urlHandler,
@@ -78,6 +80,7 @@ class Extension {
           .toList() ?? [],
       hasMetadataProvider: json['has_metadata_provider'] as bool? ?? false,
       hasDownloadProvider: json['has_download_provider'] as bool? ?? false,
+      hasLyricsProvider: json['has_lyrics_provider'] as bool? ?? false,
       skipMetadataEnrichment: json['skip_metadata_enrichment'] as bool? ?? false,
       searchBehavior: json['search_behavior'] != null 
           ? SearchBehavior.fromJson(json['search_behavior'] as Map<String, dynamic>)
@@ -111,6 +114,7 @@ class Extension {
     List<QualityOption>? qualityOptions,
     bool? hasMetadataProvider,
     bool? hasDownloadProvider,
+    bool? hasLyricsProvider,
     bool? skipMetadataEnrichment,
     SearchBehavior? searchBehavior,
     URLHandler? urlHandler,
@@ -134,6 +138,7 @@ class Extension {
       qualityOptions: qualityOptions ?? this.qualityOptions,
       hasMetadataProvider: hasMetadataProvider ?? this.hasMetadataProvider,
       hasDownloadProvider: hasDownloadProvider ?? this.hasDownloadProvider,
+      hasLyricsProvider: hasLyricsProvider ?? this.hasLyricsProvider,
       skipMetadataEnrichment: skipMetadataEnrichment ?? this.skipMetadataEnrichment,
       searchBehavior: searchBehavior ?? this.searchBehavior,
       urlHandler: urlHandler ?? this.urlHandler,

lib/providers/settings_provider.dart

@@ -13,6 +13,9 @@ const _spotifyClientSecretKey = 'spotify_client_secret';
 final _log = AppLogger('SettingsProvider');
 
 class SettingsNotifier extends Notifier<AppSettings> {
+  static const List<int> _youtubeOpusSupportedBitrates = [128, 256];
+  static const List<int> _youtubeMp3SupportedBitrates = [128, 256, 320];
+
   final Future<SharedPreferences> _prefs = SharedPreferences.getInstance();
   final FlutterSecureStorage _secureStorage = const FlutterSecureStorage();
   bool _isSavingSettings = false;
@@ -32,6 +35,7 @@ class SettingsNotifier extends Notifier<AppSettings> {
       state = AppSettings.fromJson(jsonDecode(json));
 
       await _runMigrations(prefs);
+      await _normalizeYouTubeBitratesIfNeeded();
     }
 
     await _loadSpotifyClientSecret(prefs);
@@ -39,6 +43,23 @@ class SettingsNotifier extends Notifier<AppSettings> {
     _applySpotifyCredentials();
 
     LogBuffer.loggingEnabled = state.enableLogging;
+
+    _syncLyricsSettingsToBackend();
+  }
+
+  void _syncLyricsSettingsToBackend() {
+    PlatformBridge.setLyricsProviders(state.lyricsProviders).catchError((e) {
+      _log.w('Failed to sync lyrics providers to backend: $e');
+    });
+
+    PlatformBridge.setLyricsFetchOptions({
+      'include_translation_netease': state.lyricsIncludeTranslationNetease,
+      'include_romanization_netease': state.lyricsIncludeRomanizationNetease,
+      'multi_person_word_by_word': state.lyricsMultiPersonWordByWord,
+      'musixmatch_language': state.musixmatchLanguage,
+    }).catchError((e) {
+      _log.w('Failed to sync lyrics fetch options to backend: $e');
+    });
   }
 
   Future<void> _runMigrations(SharedPreferences prefs) async {
@@ -90,6 +111,49 @@ class SettingsNotifier extends Notifier<AppSettings> {
     }
   }
 
+  int _nearestSupportedBitrate(int value, List<int> supported) {
+    var nearest = supported.first;
+    var nearestDistance = (value - nearest).abs();
+
+    for (final option in supported.skip(1)) {
+      final distance = (value - option).abs();
+      // On tie, prefer higher quality bitrate.
+      if (distance < nearestDistance ||
+          (distance == nearestDistance && option > nearest)) {
+        nearest = option;
+        nearestDistance = distance;
+      }
+    }
+
+    return nearest;
+  }
+
+  int _normalizeYouTubeOpusBitrate(int bitrate) {
+    return _nearestSupportedBitrate(bitrate, _youtubeOpusSupportedBitrates);
+  }
+
+  int _normalizeYouTubeMp3Bitrate(int bitrate) {
+    return _nearestSupportedBitrate(bitrate, _youtubeMp3SupportedBitrates);
+  }
+
+  Future<void> _normalizeYouTubeBitratesIfNeeded() async {
+    final normalizedOpus = _normalizeYouTubeOpusBitrate(
+      state.youtubeOpusBitrate,
+    );
+    final normalizedMp3 = _normalizeYouTubeMp3Bitrate(state.youtubeMp3Bitrate);
+
+    if (normalizedOpus == state.youtubeOpusBitrate &&
+        normalizedMp3 == state.youtubeMp3Bitrate) {
+      return;
+    }
+
+    state = state.copyWith(
+      youtubeOpusBitrate: normalizedOpus,
+      youtubeMp3Bitrate: normalizedMp3,
+    );
+    await _saveSettings();
+  }
+
   Future<void> _loadSpotifyClientSecret(SharedPreferences prefs) async {
     final storedSecret = await _secureStorage.read(
       key: _spotifyClientSecretKey,
@@ -188,6 +252,38 @@ class SettingsNotifier extends Notifier<AppSettings> {
     }
   }
 
+  void setLyricsProviders(List<String> providers) {
+    state = state.copyWith(lyricsProviders: providers);
+    _saveSettings();
+    _syncLyricsSettingsToBackend();
+  }
+
+  void setLyricsIncludeTranslationNetease(bool enabled) {
+    state = state.copyWith(lyricsIncludeTranslationNetease: enabled);
+    _saveSettings();
+    _syncLyricsSettingsToBackend();
+  }
+
+  void setLyricsIncludeRomanizationNetease(bool enabled) {
+    state = state.copyWith(lyricsIncludeRomanizationNetease: enabled);
+    _saveSettings();
+    _syncLyricsSettingsToBackend();
+  }
+
+  void setLyricsMultiPersonWordByWord(bool enabled) {
+    state = state.copyWith(lyricsMultiPersonWordByWord: enabled);
+    _saveSettings();
+    _syncLyricsSettingsToBackend();
+  }
+
+  void setMusixmatchLanguage(String languageCode) {
+    state = state.copyWith(
+      musixmatchLanguage: languageCode.trim().toLowerCase(),
+    );
+    _saveSettings();
+    _syncLyricsSettingsToBackend();
+  }
+
   void setMaxQualityCover(bool enabled) {
     state = state.copyWith(maxQualityCover: enabled);
     _saveSettings();
@@ -343,6 +439,18 @@ class SettingsNotifier extends Notifier<AppSettings> {
     _saveSettings();
   }
 
+  void setYoutubeOpusBitrate(int bitrate) {
+    final normalized = _normalizeYouTubeOpusBitrate(bitrate);
+    state = state.copyWith(youtubeOpusBitrate: normalized);
+    _saveSettings();
+  }
+
+  void setYoutubeMp3Bitrate(int bitrate) {
+    final normalized = _normalizeYouTubeMp3Bitrate(bitrate);
+    state = state.copyWith(youtubeMp3Bitrate: normalized);
+    _saveSettings();
+  }
+
   void setUseAllFilesAccess(bool enabled) {
     state = state.copyWith(useAllFilesAccess: enabled);
     _saveSettings();

lib/screens/settings/about_page.dart

@@ -141,6 +141,14 @@ class AboutPage extends StatelessWidget {
                     title: context.l10n.aboutSpotiSaver,
                     subtitle: context.l10n.aboutSpotiSaverDesc,
                     onTap: () => _launchUrl('https://spotisaver.net'),
+                    showDivider: true,
+                  ),
+                  _AboutSettingsItem(
+                    icon: Icons.lyrics_outlined,
+                    title: 'Paxsenix',
+                    subtitle:
+                        'Partner lyrics proxy for Apple Music and QQ Music sources',
+                    onTap: () => _launchUrl('https://lyrics.paxsenix.org'),
                     showDivider: false,
                   ),
                 ],

lib/screens/settings/donate_page.dart

@@ -68,7 +68,9 @@ class DonatePage extends StatelessWidget {
                   // Combined notice card
                   Card(
                     elevation: 0,
-                    color: colorScheme.secondaryContainer.withValues(alpha: 0.3),
+                    color: colorScheme.secondaryContainer.withValues(
+                      alpha: 0.3,
+                    ),
                     shape: RoundedRectangleBorder(
                       borderRadius: BorderRadius.circular(20),
                     ),
@@ -98,7 +100,8 @@ class DonatePage extends StatelessWidget {
                           const SizedBox(height: 10),
                           _NoticeLine(
                             icon: Icons.block,
-                            text: 'Not selling early access, premium features, or paywalls',
+                            text:
+                                'Not selling early access, premium features, or paywalls',
                             colorScheme: colorScheme,
                           ),
                           const SizedBox(height: 6),
@@ -110,36 +113,40 @@ class DonatePage extends StatelessWidget {
                           const SizedBox(height: 6),
                           _NoticeLine(
                             icon: Icons.favorite_border,
-                            text: 'Your support is the only way to keep this project alive',
+                            text:
+                                'Your support is the only way to keep this project alive',
                             colorScheme: colorScheme,
                           ),
                           Divider(
                             height: 24,
-                            color: colorScheme.outlineVariant.withValues(alpha: 0.3),
+                            color: colorScheme.outlineVariant.withValues(
+                              alpha: 0.3,
+                            ),
                           ),
                           _NoticeLine(
                             icon: Icons.history,
-                            text: 'Your name stays permanently in every version it was included in',
+                            text:
+                                'Your name stays permanently in every version it was included in',
                             colorScheme: colorScheme,
                           ),
                           const SizedBox(height: 6),
                           _NoticeLine(
                             icon: Icons.update,
-                            text: 'Supporter list is updated monthly and embedded in the app',
+                            text:
+                                'Supporter list is updated monthly and embedded in the app',
                             colorScheme: colorScheme,
                           ),
                           const SizedBox(height: 6),
                           _NoticeLine(
                             icon: Icons.cloud_off,
-                            text: 'No remote server -- everything is stored locally',
+                            text:
+                                'No remote server -- everything is stored locally',
                             colorScheme: colorScheme,
                           ),
                         ],
                       ),
                     ),
                   ),
-
-
                 ],
               ),
             ),
@@ -158,6 +165,16 @@ class _RecentDonorsCard extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final isDark = Theme.of(context).brightness == Brightness.dark;
+    const donorNames = [
+      'J',
+      'Julian',
+      'matt_3050',
+      'Daniel',
+      '283Fabio',
+      'laflame',
+      'Elias el Autentico',
+      'Faylyne',
+    ];
 
     // Match SettingsGroup color logic
     final cardColor = isDark
@@ -200,15 +217,15 @@ class _RecentDonorsCard extends StatelessWidget {
               ),
             ),
             const SizedBox(height: 16),
-            _DonorTile(name: 'J', colorScheme: colorScheme),
-            _DonorTile(name: 'Julian', colorScheme: colorScheme),
-            _DonorTile(name: 'matt_3050', colorScheme: colorScheme),
-            _DonorTile(name: 'Daniel', colorScheme: colorScheme),
-            _DonorTile(name: '283Fabio', colorScheme: colorScheme),
-            _DonorTile(
-              name: 'Elias el Autentico',
-              colorScheme: colorScheme,
-              showDivider: false,
+            Wrap(
+              spacing: 8,
+              runSpacing: 8,
+              children: donorNames
+                  .map(
+                    (name) =>
+                        _SupporterChip(name: name, colorScheme: colorScheme),
+                  )
+                  .toList(),
             ),
           ],
         ),
@@ -340,55 +357,45 @@ class _DonateCardItem extends StatelessWidget {
   }
 }
 
-class _DonorTile extends StatelessWidget {
+class _SupporterChip extends StatelessWidget {
   final String name;
   final ColorScheme colorScheme;
-  final bool showDivider;
 
-  const _DonorTile({
-    required this.name,
-    required this.colorScheme,
-    this.showDivider = true,
-  });
+  const _SupporterChip({required this.name, required this.colorScheme});
 
   @override
   Widget build(BuildContext context) {
-    return Column(
-      mainAxisSize: MainAxisSize.min,
-      children: [
-        Padding(
-          padding: const EdgeInsets.symmetric(vertical: 10),
-          child: Row(
-            children: [
-              CircleAvatar(
-                radius: 18,
-                backgroundColor: colorScheme.primaryContainer,
-                child: Text(
-                  name.isNotEmpty ? name[0].toUpperCase() : '?',
-                  style: TextStyle(
-                    fontSize: 14,
-                    fontWeight: FontWeight.bold,
-                    color: colorScheme.onPrimaryContainer,
-                  ),
+    return Material(
+      color: colorScheme.secondaryContainer,
+      borderRadius: BorderRadius.circular(20),
+      child: Padding(
+        padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 8),
+        child: Row(
+          mainAxisSize: MainAxisSize.min,
+          children: [
+            CircleAvatar(
+              radius: 10,
+              backgroundColor: colorScheme.primary.withValues(alpha: 0.2),
+              child: Text(
+                name.isNotEmpty ? name[0].toUpperCase() : '?',
+                style: TextStyle(
+                  fontSize: 10,
+                  fontWeight: FontWeight.bold,
+                  color: colorScheme.primary,
                 ),
               ),
-              const SizedBox(width: 12),
-              Text(
-                name,
-                style: Theme.of(
-                  context,
-                ).textTheme.bodyLarge?.copyWith(color: colorScheme.onSurface),
+            ),
+            const SizedBox(width: 8),
+            Text(
+              name,
+              style: Theme.of(context).textTheme.labelLarge?.copyWith(
+                color: colorScheme.onSecondaryContainer,
+                fontWeight: FontWeight.w500,
               ),
-            ],
-          ),
+            ),
+          ],
         ),
-        if (showDivider)
-          Divider(
-            height: 1,
-            thickness: 1,
-            color: colorScheme.outlineVariant.withValues(alpha: 0.3),
-          ),
-      ],
+      ),
     );
   }
 }
@@ -414,9 +421,9 @@ class _NoticeLine extends StatelessWidget {
         Expanded(
           child: Text(
             text,
-            style: Theme.of(context).textTheme.bodySmall?.copyWith(
-              color: colorScheme.onSurface,
-            ),
+            style: Theme.of(
+              context,
+            ).textTheme.bodySmall?.copyWith(color: colorScheme.onSurface),
           ),
         ),
       ],

lib/screens/settings/download_settings_page.dart

@@ -11,6 +11,7 @@ import 'package:spotiflac_android/providers/extension_provider.dart';
 import 'package:spotiflac_android/services/platform_bridge.dart';
 import 'package:spotiflac_android/utils/app_bar_layout.dart';
 import 'package:spotiflac_android/utils/file_access.dart';
+import 'package:spotiflac_android/screens/settings/lyrics_provider_priority_page.dart';
 import 'package:spotiflac_android/widgets/settings_group.dart';
 
 class DownloadSettingsPage extends ConsumerStatefulWidget {
@@ -260,6 +261,33 @@ class _DownloadSettingsPageState extends ConsumerState<DownloadSettingsPage> {
                       ),
                     ),
                   ],
+                  SettingsItem(
+                    title: context.l10n.youtubeOpusBitrateTitle,
+                    subtitle: '${settings.youtubeOpusBitrate}kbps (128/256)',
+                    onTap: () => _showYoutubeBitratePicker(
+                      context: context,
+                      title: context.l10n.youtubeOpusBitrateTitle,
+                      currentValue: settings.youtubeOpusBitrate,
+                      options: const [128, 256],
+                      onSave: (value) => ref
+                          .read(settingsProvider.notifier)
+                          .setYoutubeOpusBitrate(value),
+                    ),
+                  ),
+                  SettingsItem(
+                    title: context.l10n.youtubeMp3BitrateTitle,
+                    subtitle: '${settings.youtubeMp3Bitrate}kbps (128/256/320)',
+                    onTap: () => _showYoutubeBitratePicker(
+                      context: context,
+                      title: context.l10n.youtubeMp3BitrateTitle,
+                      currentValue: settings.youtubeMp3Bitrate,
+                      options: const [128, 256, 320],
+                      onSave: (value) => ref
+                          .read(settingsProvider.notifier)
+                          .setYoutubeMp3Bitrate(value),
+                    ),
+                    showDivider: false,
+                  ),
                 ],
               ),
             ),
@@ -270,17 +298,88 @@ class _DownloadSettingsPageState extends ConsumerState<DownloadSettingsPage> {
             SliverToBoxAdapter(
               child: SettingsGroup(
                 children: [
-                  SettingsItem(
-                    icon: Icons.lyrics_outlined,
-                    title: context.l10n.lyricsMode,
-                    subtitle: _getLyricsModeLabel(context, settings.lyricsMode),
-                    onTap: () => _showLyricsModePicker(
-                      context,
-                      ref,
-                      settings.lyricsMode,
-                    ),
-                    showDivider: false,
+                  SettingsSwitchItem(
+                    icon: Icons.subtitles_outlined,
+                    title: context.l10n.optionsEmbedLyrics,
+                    subtitle: context.l10n.optionsEmbedLyricsSubtitle,
+                    value: settings.embedLyrics,
+                    onChanged: (value) => ref
+                        .read(settingsProvider.notifier)
+                        .setEmbedLyrics(value),
+                    showDivider: settings.embedLyrics,
                   ),
+                  if (settings.embedLyrics) ...[
+                    SettingsItem(
+                      icon: Icons.lyrics_outlined,
+                      title: context.l10n.lyricsMode,
+                      subtitle:
+                          _getLyricsModeLabel(context, settings.lyricsMode),
+                      onTap: () => _showLyricsModePicker(
+                        context,
+                        ref,
+                        settings.lyricsMode,
+                      ),
+                    ),
+                    SettingsItem(
+                      icon: Icons.source_outlined,
+                      title: 'Lyrics Providers',
+                      subtitle: _getLyricsProvidersSubtitle(
+                        settings.lyricsProviders,
+                      ),
+                      onTap: () => Navigator.push(
+                        context,
+                        MaterialPageRoute(
+                          builder: (_) => const LyricsProviderPriorityPage(),
+                        ),
+                      ),
+                    ),
+                    SettingsSwitchItem(
+                      icon: Icons.translate_outlined,
+                      title: 'Netease: Include Translation',
+                      subtitle: settings.lyricsIncludeTranslationNetease
+                          ? 'Append translated lyrics when available'
+                          : 'Use original lyrics only',
+                      value: settings.lyricsIncludeTranslationNetease,
+                      onChanged: (value) => ref
+                          .read(settingsProvider.notifier)
+                          .setLyricsIncludeTranslationNetease(value),
+                    ),
+                    SettingsSwitchItem(
+                      icon: Icons.text_fields_outlined,
+                      title: 'Netease: Include Romanization',
+                      subtitle: settings.lyricsIncludeRomanizationNetease
+                          ? 'Append romanized lyrics when available'
+                          : 'Disabled',
+                      value: settings.lyricsIncludeRomanizationNetease,
+                      onChanged: (value) => ref
+                          .read(settingsProvider.notifier)
+                          .setLyricsIncludeRomanizationNetease(value),
+                    ),
+                    SettingsSwitchItem(
+                      icon: Icons.record_voice_over_outlined,
+                      title: 'Apple/QQ Multi-Person Word-by-Word',
+                      subtitle: settings.lyricsMultiPersonWordByWord
+                          ? 'Enable v1/v2 speaker and [bg:] tags'
+                          : 'Simplified word-by-word formatting',
+                      value: settings.lyricsMultiPersonWordByWord,
+                      onChanged: (value) => ref
+                          .read(settingsProvider.notifier)
+                          .setLyricsMultiPersonWordByWord(value),
+                    ),
+                    SettingsItem(
+                      icon: Icons.language_outlined,
+                      title: 'Musixmatch Language',
+                      subtitle: settings.musixmatchLanguage.isEmpty
+                          ? 'Auto (original)'
+                          : settings.musixmatchLanguage.toUpperCase(),
+                      onTap: () => _showMusixmatchLanguagePicker(
+                        context,
+                        ref,
+                        settings.musixmatchLanguage,
+                      ),
+                      showDivider: false,
+                    ),
+                  ],
                 ],
               ),
             ),
@@ -1183,6 +1282,172 @@ class _DownloadSettingsPageState extends ConsumerState<DownloadSettingsPage> {
     );
   }
 
+  static const _providerDisplayNames = <String, String>{
+    'lrclib': 'LRCLIB',
+    'netease': 'Netease',
+    'musixmatch': 'Musixmatch',
+    'apple_music': 'Apple Music',
+    'qqmusic': 'QQ Music',
+  };
+
+  String _getLyricsProvidersSubtitle(List<String> providers) {
+    if (providers.isEmpty) return 'None enabled';
+    return providers.map((p) => _providerDisplayNames[p] ?? p).join(' > ');
+  }
+
+  String _normalizeMusixmatchLanguage(String value) {
+    final normalized = value.trim().toLowerCase();
+    return normalized.replaceAll(RegExp(r'[^a-z0-9\-_]'), '');
+  }
+
+  void _showYoutubeBitratePicker({
+    required BuildContext context,
+    required String title,
+    required int currentValue,
+    required List<int> options,
+    required void Function(int value) onSave,
+  }) {
+    final colorScheme = Theme.of(context).colorScheme;
+
+    showModalBottomSheet(
+      context: context,
+      backgroundColor: colorScheme.surfaceContainerHigh,
+      shape: const RoundedRectangleBorder(
+        borderRadius: BorderRadius.vertical(top: Radius.circular(28)),
+      ),
+      builder: (sheetContext) => SafeArea(
+        child: Column(
+          mainAxisSize: MainAxisSize.min,
+          children: [
+            const SizedBox(height: 8),
+            Container(
+              width: 40,
+              height: 4,
+              decoration: BoxDecoration(
+                color: colorScheme.onSurfaceVariant.withValues(alpha: 0.4),
+                borderRadius: BorderRadius.circular(2),
+              ),
+            ),
+            const SizedBox(height: 8),
+            Padding(
+              padding: const EdgeInsets.fromLTRB(24, 12, 24, 8),
+              child: Row(
+                children: [
+                  Expanded(
+                    child: Text(
+                      title,
+                      style: Theme.of(sheetContext).textTheme.titleMedium
+                          ?.copyWith(fontWeight: FontWeight.bold),
+                    ),
+                  ),
+                ],
+              ),
+            ),
+            for (final bitrate in options)
+              ListTile(
+                title: Text('$bitrate kbps'),
+                trailing: bitrate == currentValue
+                    ? Icon(Icons.check, color: colorScheme.primary)
+                    : null,
+                onTap: () {
+                  onSave(bitrate);
+                  Navigator.pop(sheetContext);
+                },
+              ),
+            const SizedBox(height: 8),
+          ],
+        ),
+      ),
+    );
+  }
+
+  void _showMusixmatchLanguagePicker(
+    BuildContext context,
+    WidgetRef ref,
+    String currentLanguage,
+  ) {
+    final colorScheme = Theme.of(context).colorScheme;
+    final controller = TextEditingController(text: currentLanguage);
+
+    showModalBottomSheet(
+      context: context,
+      backgroundColor: colorScheme.surfaceContainerHigh,
+      shape: const RoundedRectangleBorder(
+        borderRadius: BorderRadius.vertical(top: Radius.circular(28)),
+      ),
+      isScrollControlled: true,
+      builder: (context) => Padding(
+        padding: EdgeInsets.only(
+          left: 24,
+          right: 24,
+          top: 24,
+          bottom: 24 + MediaQuery.of(context).viewInsets.bottom,
+        ),
+        child: Column(
+          mainAxisSize: MainAxisSize.min,
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: [
+            Text(
+              'Musixmatch Language',
+              style: Theme.of(
+                context,
+              ).textTheme.titleLarge?.copyWith(fontWeight: FontWeight.bold),
+            ),
+            const SizedBox(height: 8),
+            Text(
+              'Set preferred language code (example: en, es, ja). Leave empty for auto.',
+              style: Theme.of(context).textTheme.bodyMedium?.copyWith(
+                color: colorScheme.onSurfaceVariant,
+              ),
+            ),
+            const SizedBox(height: 16),
+            TextField(
+              controller: controller,
+              textInputAction: TextInputAction.done,
+              decoration: const InputDecoration(
+                labelText: 'Language code',
+                hintText: 'auto / en / es / ja',
+              ),
+            ),
+            const SizedBox(height: 16),
+            Row(
+              mainAxisAlignment: MainAxisAlignment.end,
+              children: [
+                TextButton(
+                  onPressed: () => Navigator.pop(context),
+                  child: Text(context.l10n.dialogCancel),
+                ),
+                const SizedBox(width: 8),
+                TextButton(
+                  onPressed: () {
+                    ref
+                        .read(settingsProvider.notifier)
+                        .setMusixmatchLanguage('');
+                    Navigator.pop(context);
+                  },
+                  child: const Text('Auto'),
+                ),
+                const SizedBox(width: 8),
+                FilledButton(
+                  onPressed: () {
+                    final normalized = _normalizeMusixmatchLanguage(
+                      controller.text,
+                    );
+                    ref
+                        .read(settingsProvider.notifier)
+                        .setMusixmatchLanguage(normalized);
+                    Navigator.pop(context);
+                  },
+                  child: Text(context.l10n.dialogSave),
+                ),
+              ],
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+
   String _getTidalHighFormatLabel(String format) {
     switch (format) {
       case 'mp3_320':

lib/screens/settings/extension_detail_page.dart

@@ -218,6 +218,11 @@ class _ExtensionDetailPageState extends ConsumerState<ExtensionDetailPage> {
                   title: context.l10n.extensionDownloadProvider,
                   enabled: extension.hasDownloadProvider,
                 ),
+                _CapabilityItem(
+                  icon: Icons.lyrics,
+                  title: context.l10n.extensionLyricsProvider,
+                  enabled: extension.hasLyricsProvider,
+                ),
                 _CapabilityItem(
                   icon: Icons.manage_search,
                   title: context.l10n.extensionsSearchProvider,

lib/screens/settings/lyrics_provider_priority_page.dart

@@ -0,0 +1,572 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:spotiflac_android/providers/settings_provider.dart';
+import 'package:spotiflac_android/utils/app_bar_layout.dart';
+import 'package:spotiflac_android/widgets/settings_group.dart';
+
+class LyricsProviderPriorityPage extends ConsumerStatefulWidget {
+  const LyricsProviderPriorityPage({super.key});
+
+  @override
+  ConsumerState<LyricsProviderPriorityPage> createState() =>
+      _LyricsProviderPriorityPageState();
+}
+
+class _LyricsProviderPriorityPageState
+    extends ConsumerState<LyricsProviderPriorityPage> {
+  static const _allProviderIds = [
+    'lrclib',
+    'netease',
+    'musixmatch',
+    'apple_music',
+    'qqmusic',
+  ];
+
+  late List<String> _enabledProviders;
+  late List<String> _initialProviders;
+  bool _hasChanges = false;
+
+  List<String> get _disabledProviders => _allProviderIds
+      .where((id) => !_enabledProviders.contains(id))
+      .toList();
+
+  @override
+  void initState() {
+    super.initState();
+    final settings = ref.read(settingsProvider);
+    _enabledProviders = List.from(settings.lyricsProviders);
+    _initialProviders = List.from(settings.lyricsProviders);
+  }
+
+  void _markChanged() {
+    final changed = _enabledProviders.length != _initialProviders.length ||
+        !_enabledProviders
+            .asMap()
+            .entries
+            .every((e) =>
+                e.key < _initialProviders.length &&
+                _initialProviders[e.key] == e.value);
+    setState(() => _hasChanges = changed);
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    final topPadding = normalizedHeaderTopPadding(context);
+    final disabled = _disabledProviders;
+
+    return PopScope(
+      canPop: !_hasChanges,
+      onPopInvokedWithResult: (didPop, result) async {
+        if (didPop) return;
+        final shouldPop = await _confirmDiscard(context);
+        if (shouldPop && context.mounted) {
+          Navigator.pop(context);
+        }
+      },
+      child: Scaffold(
+        body: CustomScrollView(
+          slivers: [
+            // ── Collapsing App Bar ──
+            SliverAppBar(
+              expandedHeight: 120 + topPadding,
+              collapsedHeight: kToolbarHeight,
+              floating: false,
+              pinned: true,
+              backgroundColor: colorScheme.surface,
+              surfaceTintColor: Colors.transparent,
+              leading: IconButton(
+                icon: const Icon(Icons.arrow_back),
+                onPressed: () async {
+                  if (_hasChanges) {
+                    final shouldPop = await _confirmDiscard(context);
+                    if (shouldPop && context.mounted) {
+                      Navigator.pop(context);
+                    }
+                  } else {
+                    Navigator.pop(context);
+                  }
+                },
+              ),
+              actions: [
+                if (_hasChanges)
+                  TextButton(
+                    onPressed: _saveChanges,
+                    child: const Text('Save'),
+                  ),
+              ],
+              flexibleSpace: LayoutBuilder(
+                builder: (context, constraints) {
+                  final maxHeight = 120 + topPadding;
+                  final minHeight = kToolbarHeight + topPadding;
+                  final expandRatio = ((constraints.maxHeight - minHeight) /
+                          (maxHeight - minHeight))
+                      .clamp(0.0, 1.0);
+                  final leftPadding = 56 - (32 * expandRatio);
+                  return FlexibleSpaceBar(
+                    expandedTitleScale: 1.0,
+                    titlePadding:
+                        EdgeInsets.only(left: leftPadding, bottom: 16),
+                    title: Text(
+                      'Lyrics Providers',
+                      style: TextStyle(
+                        fontSize: 20 + (8 * expandRatio),
+                        fontWeight: FontWeight.bold,
+                        color: colorScheme.onSurface,
+                      ),
+                    ),
+                  );
+                },
+              ),
+            ),
+
+            // ── Description ──
+            SliverToBoxAdapter(
+              child: Padding(
+                padding: const EdgeInsets.fromLTRB(16, 4, 16, 8),
+                child: Text(
+                  'Enable, disable and reorder lyrics sources. '
+                  'Providers are tried top-to-bottom until lyrics are found.',
+                  style: Theme.of(context).textTheme.bodyMedium?.copyWith(
+                        color: colorScheme.onSurfaceVariant,
+                      ),
+                ),
+              ),
+            ),
+
+            // ── Enabled section header ──
+            if (_enabledProviders.isNotEmpty)
+              SliverToBoxAdapter(
+                child: SettingsSectionHeader(
+                  title: 'Enabled (${_enabledProviders.length})',
+                ),
+              ),
+
+            // ── Reorderable enabled list ──
+            if (_enabledProviders.isNotEmpty)
+              SliverPadding(
+                padding: const EdgeInsets.symmetric(horizontal: 16),
+                sliver: SliverReorderableList(
+                  itemCount: _enabledProviders.length,
+                  itemBuilder: (context, index) {
+                    final id = _enabledProviders[index];
+                    final info = _getLyricsProviderInfo(id);
+                    return _EnabledProviderItem(
+                      key: ValueKey(id),
+                      providerId: id,
+                      info: info,
+                      index: index,
+                      isFirst: index == 0,
+                      onToggle: () => _disableProvider(id),
+                    );
+                  },
+                  onReorder: (oldIndex, newIndex) {
+                    setState(() {
+                      if (newIndex > oldIndex) newIndex -= 1;
+                      final item = _enabledProviders.removeAt(oldIndex);
+                      _enabledProviders.insert(newIndex, item);
+                    });
+                    _markChanged();
+                  },
+                ),
+              ),
+
+            // ── Disabled section header ──
+            if (disabled.isNotEmpty)
+              SliverToBoxAdapter(
+                child: SettingsSectionHeader(
+                  title: 'Disabled (${disabled.length})',
+                ),
+              ),
+
+            // ── Disabled list ──
+            if (disabled.isNotEmpty)
+              SliverPadding(
+                padding: const EdgeInsets.symmetric(horizontal: 16),
+                sliver: SliverList(
+                  delegate: SliverChildBuilderDelegate(
+                    (context, index) {
+                      final id = disabled[index];
+                      final info = _getLyricsProviderInfo(id);
+                      return _DisabledProviderItem(
+                        key: ValueKey(id),
+                        providerId: id,
+                        info: info,
+                        onToggle: () => _enableProvider(id),
+                      );
+                    },
+                    childCount: disabled.length,
+                  ),
+                ),
+              ),
+
+            // ── Info banner ──
+            SliverToBoxAdapter(
+              child: Padding(
+                padding: const EdgeInsets.all(16),
+                child: Container(
+                  padding: const EdgeInsets.all(12),
+                  decoration: BoxDecoration(
+                    color:
+                        colorScheme.tertiaryContainer.withValues(alpha: 0.3),
+                    borderRadius: BorderRadius.circular(12),
+                  ),
+                  child: Row(
+                    children: [
+                      Icon(Icons.info_outline,
+                          size: 20, color: colorScheme.tertiary),
+                      const SizedBox(width: 12),
+                      Expanded(
+                        child: Text(
+                          'Extension lyrics providers always run before '
+                          'built-in providers. At least one provider must '
+                          'remain enabled.',
+                          style:
+                              Theme.of(context).textTheme.bodySmall?.copyWith(
+                                    color: colorScheme.onTertiaryContainer,
+                                  ),
+                        ),
+                      ),
+                    ],
+                  ),
+                ),
+              ),
+            ),
+
+            const SliverToBoxAdapter(child: SizedBox(height: 32)),
+          ],
+        ),
+      ),
+    );
+  }
+
+  // ── State mutations ──
+
+  void _enableProvider(String id) {
+    setState(() => _enabledProviders.add(id));
+    _markChanged();
+  }
+
+  void _disableProvider(String id) {
+    if (_enabledProviders.length <= 1) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        const SnackBar(
+          content: Text('At least one provider must remain enabled'),
+        ),
+      );
+      return;
+    }
+    setState(() => _enabledProviders.remove(id));
+    _markChanged();
+  }
+
+  // ── Save / Discard ──
+
+  Future<void> _saveChanges() async {
+    ref
+        .read(settingsProvider.notifier)
+        .setLyricsProviders(List<String>.from(_enabledProviders));
+    setState(() {
+      _initialProviders = List.from(_enabledProviders);
+      _hasChanges = false;
+    });
+    if (mounted) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        const SnackBar(content: Text('Lyrics provider priority saved')),
+      );
+    }
+  }
+
+  Future<bool> _confirmDiscard(BuildContext context) async {
+    final result = await showDialog<bool>(
+      context: context,
+      builder: (context) => AlertDialog(
+        title: const Text('Discard changes?'),
+        content:
+            const Text('You have unsaved changes that will be lost.'),
+        actions: [
+          TextButton(
+            onPressed: () => Navigator.pop(context, false),
+            child: const Text('Cancel'),
+          ),
+          FilledButton(
+            onPressed: () => Navigator.pop(context, true),
+            child: const Text('Discard'),
+          ),
+        ],
+      ),
+    );
+    return result ?? false;
+  }
+
+  // ── Provider metadata ──
+
+  static _LyricsProviderInfo _getLyricsProviderInfo(String id) {
+    switch (id) {
+      case 'lrclib':
+        return _LyricsProviderInfo(
+          name: 'LRCLIB',
+          description: 'Open-source synced lyrics database',
+          icon: Icons.subtitles_outlined,
+        );
+      case 'netease':
+        return _LyricsProviderInfo(
+          name: 'Netease',
+          description: 'NetEase Cloud Music (good for Asian songs)',
+          icon: Icons.cloud_outlined,
+        );
+      case 'musixmatch':
+        return _LyricsProviderInfo(
+          name: 'Musixmatch',
+          description: 'Largest lyrics database (multi-language)',
+          icon: Icons.translate,
+        );
+      case 'apple_music':
+        return _LyricsProviderInfo(
+          name: 'Apple Music',
+          description: 'Word-by-word synced lyrics (via proxy)',
+          icon: Icons.music_note,
+        );
+      case 'qqmusic':
+        return _LyricsProviderInfo(
+          name: 'QQ Music',
+          description: 'QQ Music (good for Chinese songs, via proxy)',
+          icon: Icons.queue_music,
+        );
+      default:
+        return _LyricsProviderInfo(
+          name: id,
+          description: 'Extension provider',
+          icon: Icons.extension,
+        );
+    }
+  }
+}
+
+// ═══════════════════════════════════════════════════════════════════════════
+//  Enabled provider card (reorderable)
+// ═══════════════════════════════════════════════════════════════════════════
+
+class _EnabledProviderItem extends StatelessWidget {
+  final String providerId;
+  final _LyricsProviderInfo info;
+  final int index;
+  final bool isFirst;
+  final VoidCallback onToggle;
+
+  const _EnabledProviderItem({
+    super.key,
+    required this.providerId,
+    required this.info,
+    required this.index,
+    required this.isFirst,
+    required this.onToggle,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    final isDark = Theme.of(context).brightness == Brightness.dark;
+
+    final backgroundColor = isDark
+        ? Color.alphaBlend(
+            Colors.white.withValues(alpha: 0.05),
+            colorScheme.surface,
+          )
+        : colorScheme.surfaceContainerHigh;
+
+    return Padding(
+      padding: const EdgeInsets.only(bottom: 8),
+      child: Material(
+        color: backgroundColor,
+        borderRadius: BorderRadius.circular(16),
+        child: ReorderableDragStartListener(
+          index: index,
+          child: Padding(
+            padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
+            child: Row(
+              children: [
+                // Numbered badge
+                Container(
+                  width: 28,
+                  height: 28,
+                  decoration: BoxDecoration(
+                    color: isFirst
+                        ? colorScheme.primaryContainer
+                        : colorScheme.surfaceContainerHighest,
+                    shape: BoxShape.circle,
+                  ),
+                  child: Center(
+                    child: Text(
+                      '${index + 1}',
+                      style: TextStyle(
+                        fontWeight: FontWeight.bold,
+                        color: isFirst
+                            ? colorScheme.onPrimaryContainer
+                            : colorScheme.onSurfaceVariant,
+                      ),
+                    ),
+                  ),
+                ),
+                const SizedBox(width: 16),
+                // Icon
+                Icon(info.icon, color: colorScheme.primary),
+                const SizedBox(width: 12),
+                // Name + description
+                Expanded(
+                  child: Column(
+                    crossAxisAlignment: CrossAxisAlignment.start,
+                    children: [
+                      Text(
+                        info.name,
+                        style:
+                            Theme.of(context).textTheme.bodyLarge?.copyWith(
+                                  fontWeight: FontWeight.w500,
+                                ),
+                      ),
+                      Text(
+                        info.description,
+                        style:
+                            Theme.of(context).textTheme.bodySmall?.copyWith(
+                                  color: colorScheme.onSurfaceVariant,
+                                ),
+                      ),
+                    ],
+                  ),
+                ),
+                // Enable/disable switch
+                SizedBox(
+                  height: 32,
+                  child: FittedBox(
+                    child: Switch(
+                      value: true,
+                      onChanged: (_) => onToggle(),
+                    ),
+                  ),
+                ),
+                const SizedBox(width: 4),
+                // Drag handle
+                Icon(
+                  Icons.drag_handle,
+                  color: colorScheme.onSurfaceVariant,
+                ),
+              ],
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+}
+
+// ═══════════════════════════════════════════════════════════════════════════
+//  Disabled provider card
+// ═══════════════════════════════════════════════════════════════════════════
+
+class _DisabledProviderItem extends StatelessWidget {
+  final String providerId;
+  final _LyricsProviderInfo info;
+  final VoidCallback onToggle;
+
+  const _DisabledProviderItem({
+    super.key,
+    required this.providerId,
+    required this.info,
+    required this.onToggle,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    final isDark = Theme.of(context).brightness == Brightness.dark;
+
+    final backgroundColor = isDark
+        ? Color.alphaBlend(
+            Colors.white.withValues(alpha: 0.03),
+            colorScheme.surface,
+          )
+        : colorScheme.surfaceContainerLow;
+
+    return Padding(
+      padding: const EdgeInsets.only(bottom: 8),
+      child: Opacity(
+        opacity: 0.6,
+        child: Material(
+          color: backgroundColor,
+          borderRadius: BorderRadius.circular(16),
+          child: InkWell(
+            borderRadius: BorderRadius.circular(16),
+            onTap: onToggle,
+            child: Padding(
+              padding:
+                  const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
+              child: Row(
+                children: [
+                  // Empty space aligned with numbered badge
+                  const SizedBox(width: 28),
+                  const SizedBox(width: 16),
+                  // Icon (muted)
+                  Icon(info.icon, color: colorScheme.outline),
+                  const SizedBox(width: 12),
+                  // Name + description
+                  Expanded(
+                    child: Column(
+                      crossAxisAlignment: CrossAxisAlignment.start,
+                      children: [
+                        Text(
+                          info.name,
+                          style: Theme.of(context)
+                              .textTheme
+                              .bodyLarge
+                              ?.copyWith(
+                                fontWeight: FontWeight.w500,
+                                color: colorScheme.onSurfaceVariant,
+                              ),
+                        ),
+                        Text(
+                          info.description,
+                          style: Theme.of(context)
+                              .textTheme
+                              .bodySmall
+                              ?.copyWith(
+                                color: colorScheme.outline,
+                              ),
+                        ),
+                      ],
+                    ),
+                  ),
+                  // Switch
+                  SizedBox(
+                    height: 32,
+                    child: FittedBox(
+                      child: Switch(
+                        value: false,
+                        onChanged: (_) => onToggle(),
+                      ),
+                    ),
+                  ),
+                ],
+              ),
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+}
+
+// ═══════════════════════════════════════════════════════════════════════════
+//  Provider info model
+// ═══════════════════════════════════════════════════════════════════════════
+
+class _LyricsProviderInfo {
+  final String name;
+  final String description;
+  final IconData icon;
+
+  const _LyricsProviderInfo({
+    required this.name,
+    required this.description,
+    required this.icon,
+  });
+}

lib/screens/track_metadata_screen.dart

@@ -1,3 +1,4 @@
+import 'dart:async';
 import 'dart:io';
 import 'dart:ui';
 import 'package:flutter/material.dart';
@@ -56,6 +57,7 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
   String? _rawLyrics; // Raw LRC with timestamps for embedding
   bool _lyricsLoading = false;
   String? _lyricsError;
+  String? _lyricsSource;
   bool _showTitleInAppBar = false;
   bool _lyricsEmbedded = false; // Track if lyrics are embedded in file
   bool _isEmbedding = false; // Track embed operation in progress
@@ -69,6 +71,14 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
     r'^\[\d{2}:\d{2}\.\d{2,3}\]',
   );
   static final RegExp _lrcMetadataPattern = RegExp(r'^\[[a-zA-Z]+:.*\]$');
+  static final RegExp _lrcInlineTimestampPattern = RegExp(
+    r'<\d{2}:\d{2}\.\d{2,3}>',
+  );
+  static final RegExp _lrcSpeakerPrefixPattern = RegExp(r'^(v1|v2):\s*');
+  static final RegExp _lrcBackgroundLinePattern = RegExp(r'^\[bg:(.*)\]$');
+  static final RegExp _invalidFileNameChars = RegExp(r'[<>:"/\\|?*\x00-\x1f]');
+  static final RegExp _multiUnderscore = RegExp(r'_+');
+  static final RegExp _leadingOrTrailingDots = RegExp(r'^\.+|\.+$');
   static const List<String> _months = [
     'Jan',
     'Feb',
@@ -1339,6 +1349,16 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
                   ),
               ],
             ),
+            if (_lyricsSource != null && _lyricsSource!.trim().isNotEmpty)
+              Padding(
+                padding: const EdgeInsets.only(top: 4),
+                child: Text(
+                  'Source: ${_lyricsSource!}',
+                  style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                    color: colorScheme.onSurfaceVariant,
+                  ),
+                ),
+              ),
             const SizedBox(height: 12),
 
             if (_lyricsLoading)
@@ -1460,6 +1480,7 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
       _lyricsLoading = true;
       _lyricsError = null;
       _isInstrumental = false;
+      _lyricsSource = null;
     });
 
     try {
@@ -1468,20 +1489,31 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
 
       // First, check if lyrics are embedded in the file
       if (_fileExists) {
-        final embeddedResult = await PlatformBridge.getLyricsLRC(
-          '',
-          trackName,
-          artistName,
-          filePath: cleanFilePath,
-          durationMs: 0,
-        ).timeout(const Duration(seconds: 5), onTimeout: () => '');
+        final embeddedResult =
+            await PlatformBridge.getLyricsLRCWithSource(
+              '',
+              trackName,
+              artistName,
+              filePath: cleanFilePath,
+              durationMs: 0,
+            ).timeout(
+              const Duration(seconds: 5),
+              onTimeout: () => <String, dynamic>{'lyrics': '', 'source': ''},
+            );
 
-        if (embeddedResult.isNotEmpty) {
+        final embeddedLyrics = embeddedResult['lyrics']?.toString() ?? '';
+        final embeddedSource = embeddedResult['source']?.toString() ?? '';
+
+        if (embeddedLyrics.isNotEmpty) {
           // Lyrics found in file
           if (mounted) {
-            final cleanLyrics = _cleanLrcForDisplay(embeddedResult);
+            final cleanLyrics = _cleanLrcForDisplay(embeddedLyrics);
             setState(() {
               _lyrics = cleanLyrics;
+              _rawLyrics = embeddedLyrics;
+              _lyricsSource = embeddedSource.isNotEmpty
+                  ? embeddedSource
+                  : 'Embedded';
               _lyricsEmbedded = true;
               _lyricsLoading = false;
             });
@@ -1491,43 +1523,55 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
       }
 
       // No embedded lyrics, fetch from online
-      final result = await PlatformBridge.getLyricsLRC(
+      final result = await PlatformBridge.getLyricsLRCWithSource(
         _spotifyId ?? '',
         trackName,
         artistName,
         filePath: null, // Don't check file again
         durationMs: durationMs,
-      ).timeout(const Duration(seconds: 20), onTimeout: () => '');
+      ).timeout(const Duration(seconds: 20));
+
+      final lrcText = result['lyrics']?.toString() ?? '';
+      final source = result['source']?.toString() ?? '';
+      final instrumental =
+          (result['instrumental'] as bool? ?? false) ||
+          lrcText == '[instrumental:true]';
 
       if (mounted) {
         // Check for instrumental marker
-        if (result == '[instrumental:true]') {
+        if (instrumental) {
           setState(() {
             _isInstrumental = true;
+            _lyricsSource = source.isNotEmpty ? source : null;
             _lyricsLoading = false;
           });
-        } else if (result.isEmpty) {
+        } else if (lrcText.isEmpty) {
           setState(() {
             _lyricsError = context.l10n.trackLyricsNotAvailable;
             _lyricsLoading = false;
           });
         } else {
-          final cleanLyrics = _cleanLrcForDisplay(result);
+          final cleanLyrics = _cleanLrcForDisplay(lrcText);
           setState(() {
             _lyrics = cleanLyrics;
-            _rawLyrics = result; // Keep raw LRC with timestamps for embedding
+            _rawLyrics = lrcText; // Keep raw LRC with timestamps for embedding
+            _lyricsSource = source.isNotEmpty ? source : null;
             _lyricsEmbedded = false; // Lyrics from online, not embedded
             _lyricsLoading = false;
           });
         }
       }
+    } on TimeoutException {
+      if (mounted) {
+        setState(() {
+          _lyricsError = context.l10n.trackLyricsTimeout;
+          _lyricsLoading = false;
+        });
+      }
     } catch (e) {
       if (mounted) {
-        final errorMsg = e.toString().contains('TimeoutException')
-            ? context.l10n.trackLyricsTimeout
-            : context.l10n.trackLyricsLoadFailed;
         setState(() {
-          _lyricsError = errorMsg;
+          _lyricsError = context.l10n.trackLyricsLoadFailed;
           _lyricsLoading = false;
         });
       }
@@ -1681,9 +1725,19 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
     }
   }
 
+  String _sanitizeFileNameSegment(String value) {
+    var sanitized = value.replaceAll(_invalidFileNameChars, '_').trim();
+    sanitized = sanitized.replaceAll(_leadingOrTrailingDots, '');
+    sanitized = sanitized.replaceAll(_multiUnderscore, '_');
+    if (sanitized.isEmpty) {
+      return 'untitled';
+    }
+    return sanitized;
+  }
+
   String _buildSaveBaseName() {
-    final artist = artistName.replaceAll(RegExp(r'[\\/:*?"<>|]'), '_');
-    final track = trackName.replaceAll(RegExp(r'[\\/:*?"<>|]'), '_');
+    final artist = _sanitizeFileNameSegment(artistName);
+    final track = _sanitizeFileNameSegment(trackName);
     return '$artist - $track';
   }
 
@@ -2213,17 +2267,28 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
     final cleanLines = <String>[];
 
     for (final line in lines) {
-      final trimmedLine = line.trim();
+      var cleaned = line.trim();
 
       // Skip metadata tags
-      if (_lrcMetadataPattern.hasMatch(trimmedLine)) {
+      if (_lrcMetadataPattern.hasMatch(cleaned) &&
+          !_lrcBackgroundLinePattern.hasMatch(cleaned)) {
         continue;
       }
 
-      // Remove timestamp and clean up
-      final cleanLine = trimmedLine.replaceAll(_lrcTimestampPattern, '').trim();
-      if (cleanLine.isNotEmpty) {
-        cleanLines.add(cleanLine);
+      // Convert [bg:...] wrapper to a plain secondary vocal line.
+      final bgMatch = _lrcBackgroundLinePattern.firstMatch(cleaned);
+      if (bgMatch != null) {
+        cleaned = bgMatch.group(1)?.trim() ?? '';
+      }
+
+      // Remove line timestamp, inline word-by-word timestamps, and speaker prefix.
+      cleaned = cleaned.replaceAll(_lrcTimestampPattern, '').trim();
+      cleaned = cleaned.replaceAll(_lrcInlineTimestampPattern, '');
+      cleaned = cleaned.replaceFirst(_lrcSpeakerPrefixPattern, '');
+      cleaned = cleaned.replaceAll(RegExp(r'\s+'), ' ').trim();
+
+      if (cleaned.isNotEmpty) {
+        cleanLines.add(cleaned);
       }
     }
 

lib/services/cover_cache_manager.dart

@@ -1,5 +1,6 @@
 import 'dart:io';
 import 'package:flutter/foundation.dart';
+import 'package:flutter/painting.dart';
 import 'package:flutter_cache_manager/flutter_cache_manager.dart';
 import 'package:path_provider/path_provider.dart';
 import 'package:path/path.dart' as p;
@@ -41,17 +42,7 @@ class CoverCacheManager {
       
       debugPrint('CoverCacheManager: Initializing at $_cachePath');
 
-      _instance = CacheManager(
-        Config(
-          _cacheKey,
-          stalePeriod: _maxCacheAge,
-          maxNrOfCacheObjects: _maxCacheObjects,
-          // Use path only (not databaseName) to store database in persistent directory
-          repo: JsonCacheInfoRepository(path: _cachePath),
-          fileSystem: IOFileSystem(_cachePath!),
-          fileService: HttpFileService(),
-        ),
-      );
+      _instance = _createManager(_cachePath!);
       
       _initialized = true;
       debugPrint('CoverCacheManager: Initialized successfully');
@@ -62,12 +53,47 @@ class CoverCacheManager {
   }
 
   static Future<void> clearCache() async {
-    if (!_initialized || _instance == null) return;
-    await _instance!.emptyCache();
+    if (!_initialized || _instance == null || _cachePath == null) {
+      await initialize();
+    }
+
+    final instance = _instance;
+    final cachePath = _cachePath;
+
+    if (instance == null || cachePath == null) return;
+
+    // Ask cache manager to clear indexed entries first.
+    try {
+      await instance.emptyCache();
+    } catch (e) {
+      debugPrint('CoverCacheManager: emptyCache failed, fallback to wipe: $e');
+    }
+
+    // Then wipe the directory to remove orphaned files/metadata leftovers.
+    await _wipeDirectory(cachePath);
+
+    // Clear in-memory image cache so cleared covers are not retained in RAM.
+    final imageCache = PaintingBinding.instance.imageCache;
+    imageCache.clear();
+    imageCache.clearLiveImages();
+
+    // Reset manager memory/index state after on-disk wipe.
+    instance.store.emptyMemoryCache();
+    _instance = _createManager(cachePath);
+    _initialized = true;
   }
 
   static Future<CacheStats> getStats() async {
-    if (!_initialized || _cachePath == null) {
+    if (_cachePath == null) {
+      try {
+        final appDir = await getApplicationSupportDirectory();
+        _cachePath = p.join(appDir.path, 'cover_cache');
+      } catch (_) {
+        return const CacheStats(fileCount: 0, totalSizeBytes: 0);
+      }
+    }
+
+    if (_cachePath == null) {
       return const CacheStats(fileCount: 0, totalSizeBytes: 0);
     }
 
@@ -93,6 +119,45 @@ class CoverCacheManager {
 
     return CacheStats(fileCount: fileCount, totalSizeBytes: totalSize);
   }
+
+  static CacheManager _createManager(String cachePath) {
+    return CacheManager(
+      Config(
+        _cacheKey,
+        stalePeriod: _maxCacheAge,
+        maxNrOfCacheObjects: _maxCacheObjects,
+        // Use path only (not databaseName) to store database in persistent directory
+        repo: JsonCacheInfoRepository(path: cachePath),
+        fileSystem: IOFileSystem(cachePath),
+        fileService: HttpFileService(),
+      ),
+    );
+  }
+
+  static Future<void> _wipeDirectory(String path) async {
+    final directory = Directory(path);
+    if (!await directory.exists()) {
+      await directory.create(recursive: true);
+      return;
+    }
+
+    try {
+      final entities = <FileSystemEntity>[];
+      await for (final entity in directory.list(followLinks: false)) {
+        entities.add(entity);
+      }
+
+      for (final entity in entities) {
+        try {
+          await entity.delete(recursive: true);
+        } catch (_) {}
+      }
+    } catch (_) {}
+
+    try {
+      await directory.create(recursive: true);
+    } catch (_) {}
+  }
 }
 
 class CacheStats {

lib/services/platform_bridge.dart

@@ -276,6 +276,23 @@ class PlatformBridge {
     return result as String;
   }
 
+  static Future<Map<String, dynamic>> getLyricsLRCWithSource(
+    String spotifyId,
+    String trackName,
+    String artistName, {
+    String? filePath,
+    int durationMs = 0,
+  }) async {
+    final result = await _channel.invokeMethod('getLyricsLRCWithSource', {
+      'spotify_id': spotifyId,
+      'track_name': trackName,
+      'artist_name': artistName,
+      'file_path': filePath ?? '',
+      'duration_ms': durationMs,
+    });
+    return jsonDecode(result as String) as Map<String, dynamic>;
+  }
+
   static Future<Map<String, dynamic>> embedLyricsToFile(
     String filePath,
     String lyrics,
@@ -332,6 +349,47 @@ class PlatformBridge {
     return jsonDecode(result as String) as Map<String, dynamic>;
   }
 
+  // ==================== LYRICS PROVIDER SETTINGS ====================
+
+  /// Sets the lyrics provider order. Providers not in the list are disabled.
+  static Future<void> setLyricsProviders(List<String> providers) async {
+    final providersJSON = jsonEncode(providers);
+    await _channel.invokeMethod('setLyricsProviders', {
+      'providers_json': providersJSON,
+    });
+  }
+
+  /// Returns the current lyrics provider order.
+  static Future<List<String>> getLyricsProviders() async {
+    final result = await _channel.invokeMethod('getLyricsProviders');
+    final List<dynamic> decoded = jsonDecode(result as String) as List<dynamic>;
+    return decoded.cast<String>();
+  }
+
+  /// Returns metadata about all available lyrics providers.
+  static Future<List<Map<String, dynamic>>>
+  getAvailableLyricsProviders() async {
+    final result = await _channel.invokeMethod('getAvailableLyricsProviders');
+    final List<dynamic> decoded = jsonDecode(result as String) as List<dynamic>;
+    return decoded.cast<Map<String, dynamic>>();
+  }
+
+  /// Sets advanced lyrics fetch options used by provider-specific integrations.
+  static Future<void> setLyricsFetchOptions(
+    Map<String, dynamic> options,
+  ) async {
+    final optionsJSON = jsonEncode(options);
+    await _channel.invokeMethod('setLyricsFetchOptions', {
+      'options_json': optionsJSON,
+    });
+  }
+
+  /// Returns current advanced lyrics fetch options.
+  static Future<Map<String, dynamic>> getLyricsFetchOptions() async {
+    final result = await _channel.invokeMethod('getLyricsFetchOptions');
+    return jsonDecode(result as String) as Map<String, dynamic>;
+  }
+
   static Future<Map<String, dynamic>> reEnrichFile(
     Map<String, dynamic> request,
   ) async {

lib/widgets/download_service_picker.dart

@@ -29,18 +29,42 @@ const _builtInServices = [
     id: 'tidal',
     label: 'Tidal',
     qualityOptions: [
-      QualityOption(id: 'LOSSLESS', label: 'FLAC Lossless', description: '16-bit / 44.1kHz'),
-      QualityOption(id: 'HI_RES', label: 'Hi-Res FLAC', description: '24-bit / up to 96kHz'),
-      QualityOption(id: 'HI_RES_LOSSLESS', label: 'Hi-Res FLAC Max', description: '24-bit / up to 192kHz'),
+      QualityOption(
+        id: 'LOSSLESS',
+        label: 'FLAC Lossless',
+        description: '16-bit / 44.1kHz',
+      ),
+      QualityOption(
+        id: 'HI_RES',
+        label: 'Hi-Res FLAC',
+        description: '24-bit / up to 96kHz',
+      ),
+      QualityOption(
+        id: 'HI_RES_LOSSLESS',
+        label: 'Hi-Res FLAC Max',
+        description: '24-bit / up to 192kHz',
+      ),
     ],
   ),
   BuiltInService(
     id: 'qobuz',
     label: 'Qobuz',
     qualityOptions: [
-      QualityOption(id: 'LOSSLESS', label: 'FLAC Lossless', description: '16-bit / 44.1kHz'),
-      QualityOption(id: 'HI_RES', label: 'Hi-Res FLAC', description: '24-bit / up to 96kHz'),
-      QualityOption(id: 'HI_RES_LOSSLESS', label: 'Hi-Res FLAC Max', description: '24-bit / up to 192kHz'),
+      QualityOption(
+        id: 'LOSSLESS',
+        label: 'FLAC Lossless',
+        description: '16-bit / 44.1kHz',
+      ),
+      QualityOption(
+        id: 'HI_RES',
+        label: 'Hi-Res FLAC',
+        description: '24-bit / up to 96kHz',
+      ),
+      QualityOption(
+        id: 'HI_RES_LOSSLESS',
+        label: 'Hi-Res FLAC Max',
+        description: '24-bit / up to 192kHz',
+      ),
     ],
   ),
   BuiltInService(
@@ -58,8 +82,16 @@ const _builtInServices = [
     id: 'youtube',
     label: 'YouTube',
     qualityOptions: [
-      QualityOption(id: 'opus_256', label: 'Opus 256kbps', description: 'Best quality lossy (~8MB per track)'),
-      QualityOption(id: 'mp3_320', label: 'MP3 320kbps', description: 'Best compatibility (~10MB per track)'),
+      QualityOption(
+        id: 'opus_256',
+        label: 'Opus 256kbps',
+        description: 'Best quality lossy (~8MB per track)',
+      ),
+      QualityOption(
+        id: 'mp3_320',
+        label: 'MP3 320kbps',
+        description: 'Best compatibility (~10MB per track)',
+      ),
     ],
     isDisabled: false,
     disabledReason: null,
@@ -82,7 +114,8 @@ class DownloadServicePicker extends ConsumerStatefulWidget {
   });
 
   @override
-  ConsumerState<DownloadServicePicker> createState() => _DownloadServicePickerState();
+  ConsumerState<DownloadServicePicker> createState() =>
+      _DownloadServicePickerState();
 
   /// Show the download service picker as a modal bottom sheet
   static void show(
@@ -93,7 +126,7 @@ class DownloadServicePicker extends ConsumerStatefulWidget {
     required void Function(String quality, String service) onSelect,
   }) {
     final colorScheme = Theme.of(context).colorScheme;
-    
+
     showModalBottomSheet(
       context: context,
       backgroundColor: colorScheme.surfaceContainerHigh,
@@ -112,6 +145,9 @@ class DownloadServicePicker extends ConsumerStatefulWidget {
 }
 
 class _DownloadServicePickerState extends ConsumerState<DownloadServicePicker> {
+  static const List<int> _youtubeOpusSupportedBitrates = [128, 256];
+  static const List<int> _youtubeMp3SupportedBitrates = [128, 256, 320];
+
   late String _selectedService;
 
   @override
@@ -122,28 +158,76 @@ class _DownloadServicePickerState extends ConsumerState<DownloadServicePicker> {
 
   /// Get quality options for the selected service
   List<QualityOption> _getQualityOptions() {
-    final builtIn = _builtInServices.where((s) => s.id == _selectedService).firstOrNull;
+    final settings = ref.read(settingsProvider);
+    if (_selectedService == 'youtube') {
+      final opusBitrate = _nearestSupportedBitrate(
+        settings.youtubeOpusBitrate,
+        _youtubeOpusSupportedBitrates,
+      );
+      final mp3Bitrate = _nearestSupportedBitrate(
+        settings.youtubeMp3Bitrate,
+        _youtubeMp3SupportedBitrates,
+      );
+      return [
+        QualityOption(
+          id: 'opus_$opusBitrate',
+          label: 'Opus ${opusBitrate}kbps',
+          description: 'Configured from YouTube settings',
+        ),
+        QualityOption(
+          id: 'mp3_$mp3Bitrate',
+          label: 'MP3 ${mp3Bitrate}kbps',
+          description: 'Configured from YouTube settings',
+        ),
+      ];
+    }
+
+    final builtIn = _builtInServices
+        .where((s) => s.id == _selectedService)
+        .firstOrNull;
     if (builtIn != null) {
       return builtIn.qualityOptions;
     }
 
     final extensionState = ref.read(extensionProvider);
-    final ext = extensionState.extensions.where((e) => e.id == _selectedService).firstOrNull;
+    final ext = extensionState.extensions
+        .where((e) => e.id == _selectedService)
+        .firstOrNull;
     if (ext != null && ext.qualityOptions.isNotEmpty) {
       return ext.qualityOptions;
     }
 
     // Default fallback options
     return [
-      const QualityOption(id: 'DEFAULT', label: 'Default Quality', description: 'Best available'),
+      const QualityOption(
+        id: 'DEFAULT',
+        label: 'Default Quality',
+        description: 'Best available',
+      ),
     ];
   }
 
+  int _nearestSupportedBitrate(int value, List<int> supported) {
+    var nearest = supported.first;
+    var nearestDistance = (value - nearest).abs();
+
+    for (final option in supported.skip(1)) {
+      final distance = (value - option).abs();
+      if (distance < nearestDistance ||
+          (distance == nearestDistance && option > nearest)) {
+        nearest = option;
+        nearestDistance = distance;
+      }
+    }
+
+    return nearest;
+  }
+
   @override
   Widget build(BuildContext context) {
     final colorScheme = Theme.of(context).colorScheme;
     final extensionState = ref.watch(extensionProvider);
-    
+
     final downloadExtensions = extensionState.extensions
         .where((ext) => ext.enabled && ext.hasDownloadProvider)
         .toList();
@@ -162,7 +246,10 @@ class _DownloadServicePickerState extends ConsumerState<DownloadServicePicker> {
                 artistName: widget.artistName,
                 coverUrl: widget.coverUrl,
               ),
-              Divider(height: 1, color: colorScheme.outlineVariant.withValues(alpha: 0.5)),
+              Divider(
+                height: 1,
+                color: colorScheme.outlineVariant.withValues(alpha: 0.5),
+              ),
             ] else ...[
               const SizedBox(height: 8),
               Center(
@@ -181,11 +268,13 @@ class _DownloadServicePickerState extends ConsumerState<DownloadServicePicker> {
               padding: const EdgeInsets.fromLTRB(24, 16, 24, 8),
               child: Text(
                 context.l10n.downloadFrom,
-                style: Theme.of(context).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.bold),
+                style: Theme.of(
+                  context,
+                ).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.bold),
               ),
             ),
 
-Padding(
+            Padding(
               padding: const EdgeInsets.symmetric(horizontal: 20),
               child: Wrap(
                 spacing: 8,
@@ -193,13 +282,13 @@ Padding(
                 children: [
                   for (final service in _builtInServices)
                     _ServiceChip(
-                      label: service.isDisabled 
+                      label: service.isDisabled
                           ? '${service.label} (${service.disabledReason})'
                           : service.label,
                       isSelected: _selectedService == service.id,
                       isDisabled: service.isDisabled,
-                      onTap: service.isDisabled 
-                          ? null 
+                      onTap: service.isDisabled
+                          ? null
                           : () => setState(() => _selectedService = service.id),
                     ),
                   for (final ext in downloadExtensions)
@@ -217,11 +306,15 @@ Padding(
               padding: const EdgeInsets.fromLTRB(24, 16, 24, 8),
               child: Text(
                 context.l10n.downloadSelectQuality,
-                style: Theme.of(context).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.bold),
+                style: Theme.of(
+                  context,
+                ).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.bold),
               ),
             ),
 
-            if (_builtInServices.any((s) => s.id == _selectedService && s.id != 'youtube'))
+            if (_builtInServices.any(
+              (s) => s.id == _selectedService && s.id != 'youtube',
+            ))
               Padding(
                 padding: const EdgeInsets.fromLTRB(24, 0, 24, 12),
                 child: Text(
@@ -264,27 +357,27 @@ Padding(
   }
 
   IconData _getQualityIcon(String qualityId) {
-    switch (qualityId.toUpperCase()) {
+    final normalized = qualityId.toUpperCase();
+    if (normalized.startsWith('MP3_') || normalized == 'MP3') {
+      return Icons.audiotrack;
+    }
+    if (normalized.startsWith('OPUS_') || normalized == 'OPUS') {
+      return Icons.graphic_eq;
+    }
+
+    switch (normalized) {
       case 'HI_RES_LOSSLESS':
         return Icons.four_k;
       case 'HI_RES':
         return Icons.high_quality;
       case 'LOSSLESS':
         return Icons.music_note;
-      case 'MP3_320':
-      case 'MP3':
-        return Icons.audiotrack;
-      case 'OPUS':
-      case 'OPUS_128':
-      case 'OPUS_256':
-        return Icons.graphic_eq;
       default:
         return Icons.music_note;
     }
   }
 }
 
-
 class _QualityOption extends StatelessWidget {
   final String title;
   final String subtitle;
@@ -313,7 +406,10 @@ class _QualityOption extends StatelessWidget {
       ),
       title: Text(title, style: const TextStyle(fontWeight: FontWeight.w500)),
       subtitle: subtitle.isNotEmpty
-          ? Text(subtitle, style: TextStyle(color: colorScheme.onSurfaceVariant))
+          ? Text(
+              subtitle,
+              style: TextStyle(color: colorScheme.onSurfaceVariant),
+            )
           : null,
       onTap: onTap,
     );
@@ -344,13 +440,17 @@ class _ServiceChip extends StatelessWidget {
         duration: const Duration(milliseconds: 200),
         padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 10),
         decoration: BoxDecoration(
-          color: isDisabled 
+          color: isDisabled
               ? colorScheme.surfaceContainerHighest.withValues(alpha: 0.5)
-              : isSelected 
-                  ? colorScheme.primaryContainer 
-                  : colorScheme.surfaceContainerHighest,
+              : isSelected
+              ? colorScheme.primaryContainer
+              : colorScheme.surfaceContainerHighest,
           borderRadius: BorderRadius.circular(12),
-          border: isSelected ? null : Border.all(color: colorScheme.outlineVariant.withValues(alpha: 0.5)),
+          border: isSelected
+              ? null
+              : Border.all(
+                  color: colorScheme.outlineVariant.withValues(alpha: 0.5),
+                ),
         ),
         child: Row(
           mainAxisSize: MainAxisSize.min,
@@ -366,11 +466,11 @@ class _ServiceChip extends StatelessWidget {
                   errorBuilder: (context, error, stackTrace) => Icon(
                     Icons.extension,
                     size: 18,
-                    color: isDisabled 
+                    color: isDisabled
                         ? colorScheme.onSurfaceVariant.withValues(alpha: 0.4)
-                        : isSelected 
-                            ? colorScheme.onPrimaryContainer 
-                            : colorScheme.onSurfaceVariant,
+                        : isSelected
+                        ? colorScheme.onPrimaryContainer
+                        : colorScheme.onSurfaceVariant,
                   ),
                 ),
               ),
@@ -380,11 +480,11 @@ class _ServiceChip extends StatelessWidget {
               label,
               style: TextStyle(
                 fontWeight: isSelected ? FontWeight.w600 : FontWeight.normal,
-                color: isDisabled 
+                color: isDisabled
                     ? colorScheme.onSurfaceVariant.withValues(alpha: 0.4)
-                    : isSelected 
-                        ? colorScheme.onPrimaryContainer 
-                        : colorScheme.onSurfaceVariant,
+                    : isSelected
+                    ? colorScheme.onPrimaryContainer
+                    : colorScheme.onSurfaceVariant,
               ),
             ),
           ],
@@ -419,7 +519,9 @@ class _TrackInfoHeaderState extends State<_TrackInfoHeader> {
     return Material(
       color: Colors.transparent,
       child: InkWell(
-        onTap: _isOverflowing ? () => setState(() => _expanded = !_expanded) : null,
+        onTap: _isOverflowing
+            ? () => setState(() => _expanded = !_expanded)
+            : null,
         borderRadius: const BorderRadius.only(
           topLeft: Radius.circular(28),
           topRight: Radius.circular(28),
@@ -447,26 +549,39 @@ class _TrackInfoHeaderState extends State<_TrackInfoHeader> {
                             width: 56,
                             height: 56,
                             fit: BoxFit.cover,
-                            errorBuilder: (context, error, stackTrace) => Container(
-                              width: 56,
-                              height: 56,
-                              color: colorScheme.surfaceContainerHighest,
-                              child: Icon(Icons.music_note, color: colorScheme.onSurfaceVariant),
-                            ),
+                            errorBuilder: (context, error, stackTrace) =>
+                                Container(
+                                  width: 56,
+                                  height: 56,
+                                  color: colorScheme.surfaceContainerHighest,
+                                  child: Icon(
+                                    Icons.music_note,
+                                    color: colorScheme.onSurfaceVariant,
+                                  ),
+                                ),
                           )
                         : Container(
                             width: 56,
                             height: 56,
                             color: colorScheme.surfaceContainerHighest,
-                            child: Icon(Icons.music_note, color: colorScheme.onSurfaceVariant),
+                            child: Icon(
+                              Icons.music_note,
+                              color: colorScheme.onSurfaceVariant,
+                            ),
                           ),
                   ),
                   const SizedBox(width: 12),
                   Expanded(
                     child: LayoutBuilder(
                       builder: (context, constraints) {
-                        final titleStyle = Theme.of(context).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.w600);
-                        final titleSpan = TextSpan(text: widget.trackName, style: titleStyle);
+                        final titleStyle = Theme.of(context)
+                            .textTheme
+                            .titleMedium
+                            ?.copyWith(fontWeight: FontWeight.w600);
+                        final titleSpan = TextSpan(
+                          text: widget.trackName,
+                          style: titleStyle,
+                        );
                         final titlePainter = TextPainter(
                           text: titleSpan,
                           maxLines: 1,
@@ -487,17 +602,22 @@ class _TrackInfoHeaderState extends State<_TrackInfoHeader> {
                               widget.trackName,
                               style: titleStyle,
                               maxLines: _expanded ? 10 : 1,
-                              overflow: _expanded ? TextOverflow.visible : TextOverflow.ellipsis,
+                              overflow: _expanded
+                                  ? TextOverflow.visible
+                                  : TextOverflow.ellipsis,
                             ),
                             if (widget.artistName != null) ...[
                               const SizedBox(height: 2),
                               Text(
                                 widget.artistName!,
-                                style: Theme.of(context).textTheme.bodyMedium?.copyWith(
-                                  color: colorScheme.onSurfaceVariant,
-                                ),
+                                style: Theme.of(context).textTheme.bodyMedium
+                                    ?.copyWith(
+                                      color: colorScheme.onSurfaceVariant,
+                                    ),
                                 maxLines: _expanded ? 3 : 1,
-                                overflow: _expanded ? TextOverflow.visible : TextOverflow.ellipsis,
+                                overflow: _expanded
+                                    ? TextOverflow.visible
+                                    : TextOverflow.ellipsis,
                               ),
                             ],
                           ],

pubspec.yaml

@@ -1,7 +1,7 @@
 name: spotiflac_android
 description: Download Spotify tracks in FLAC from Tidal, Qobuz & Amazon Music
 publish_to: "none"
-version: 3.6.7+81
+version: 3.6.9+82
 
 environment:
   sdk: ^3.10.0
@@ -80,10 +80,13 @@ flutter_launcher_icons:
   android: true
   ios: true
   image_path: "icon.png"
-  adaptive_icon_background: "#1a1a2e"
-  adaptive_icon_foreground: "icon.png"
+  image_path_android: "icon_android.png"
+  adaptive_icon_background: "#000000"
+  adaptive_icon_foreground: "icon_foreground_android.png"
+  adaptive_icon_foreground_inset: 16
   ios_content_mode: scaleAspectFill
   remove_alpha_ios: true
+  background_color_ios: "#000000"
 
 flutter:
   uses-material-design: true