Update changelog for v2.1.5

- Fix progress bar jumping from 1% to 100% (threshold-based updates)
- Fix incomplete downloads with temp file + size validation
- Applies to Tidal, Qobuz, and Amazon services

.github/workflows/release.yml

@@ -85,7 +85,19 @@ jobs:
           restore-keys: gradle-${{ runner.os }}-
 
       - name: Install Android SDK & NDK
-        uses: android-actions/setup-android@v3
+        run: |
+          # Use pre-installed Android SDK on GitHub runners
+          echo "ANDROID_HOME=$ANDROID_HOME"
+          echo "ANDROID_SDK_ROOT=$ANDROID_SDK_ROOT"
+          
+          # Accept licenses
+          yes | $ANDROID_HOME/cmdline-tools/latest/bin/sdkmanager --licenses || true
+          
+          # Install NDK (required for gomobile)
+          $ANDROID_HOME/cmdline-tools/latest/bin/sdkmanager "ndk;25.2.9519653" "platforms;android-34" "build-tools;34.0.0"
+          
+          # Set NDK path
+          echo "ANDROID_NDK_HOME=$ANDROID_HOME/ndk/25.2.9519653" >> $GITHUB_ENV
 
       - name: Install gomobile
         run: |
@@ -229,6 +241,23 @@ jobs:
           channel: 'stable'
           cache: true
 
+      # Swap pubspec for iOS build (includes ffmpeg_kit_flutter)
+      - name: Use iOS pubspec with FFmpeg plugin
+        run: |
+          cp pubspec.yaml pubspec_android_backup.yaml
+          cp pubspec_ios.yaml pubspec.yaml
+          echo "Swapped to iOS pubspec with ffmpeg_kit_flutter"
+
+      # Swap FFmpeg service for iOS
+      - name: Use iOS FFmpeg service
+        run: |
+          cp lib/services/ffmpeg_service.dart lib/services/ffmpeg_service_android.dart
+          cp build_assets/ffmpeg_service_ios.dart lib/services/ffmpeg_service.dart
+          # Update class name in the swapped file
+          sed -i '' 's/FFmpegServiceIOS/FFmpegService/g' lib/services/ffmpeg_service.dart
+          sed -i '' 's/FFmpegResultIOS/FFmpegResult/g' lib/services/ffmpeg_service.dart
+          echo "Swapped to iOS FFmpeg service"
+
       - name: Get Flutter dependencies
         run: flutter pub get
 

.gitignore

@@ -13,9 +13,6 @@ Thumbs.db
 # Reference folder (development only)
 referensi/
 
-# Development notes
-COMPARISON_PC_vs_ANDROID.md
-
 # Old spotiflac_android folder (moved to root)
 spotiflac_android/
 
@@ -38,7 +35,7 @@ go_backend/*.xcframework/
 
 # Android
 android/.gradle/
-android/app/libs/
+android/app/libs/gobackend.aar
 android/local.properties
 android/*.iml
 android/key.properties
@@ -52,3 +49,4 @@ ios/Pods/
 ios/.symlinks/
 ios/Flutter/Flutter.framework/
 ios/Flutter/Flutter.podspec
+android/app/libs/gobackend-sources.jar

CHANGELOG.md

@@ -1,5 +1,161 @@
 # Changelog
 
+## [2.1.5] - 2026-01-08
+
+### Added
+- **Deezer as Alternative Metadata Source**: Choose between Deezer or Spotify for search
+  - Configure in Settings > Options > Spotify API > Search Source
+  - Default is Deezer for better reliability
+  - Spotify URLs are always supported regardless of this setting
+- **Automatic Deezer Fallback for Spotify URLs**: When Spotify API is rate limited (429), automatically falls back to Deezer
+  - Uses SongLink/Odesli API to convert Spotify track/album ID to Deezer ID
+  - Fetches metadata from Deezer instead
+  - Works for tracks and albums (playlists are user-specific, artists require Spotify API)
+
+### Changed
+- **Default Download Service**: Changed from Tidal to Qobuz
+  - Fallback order is now: Qobuz → Tidal → Amazon
+- **Deezer API Updated to v2.0**: More reliable and complete metadata
+  - Direct ISRC lookup via `/track/isrc:{ISRC}` endpoint
+  - Search results now fetch full track info to include ISRC
+
+### Fixed
+- **Progress Bar Not Updating**: Fixed bug where download progress jumped from 1% directly to 100%
+  - Progress now updates smoothly every 64KB of data received
+  - First progress update happens immediately when download starts
+- **Incomplete Downloads**: Fixed bug where interrupted downloads could result in corrupted/incomplete files
+  - File size is validated against server's Content-Length header
+  - Incomplete files are automatically deleted and error is reported
+  - Applies to all services: Tidal, Qobuz, and Amazon
+- **ISRC Not Available from Deezer Search**: Search results now fetch full track details to get ISRC
+  - Improves track matching accuracy when downloading
+
+### Technical
+- New settings field: `metadataSource` in `lib/models/settings.dart`
+- New UI: Search Source selector in Options Settings page
+- Improved `ItemProgressWriter` with threshold-based progress updates
+- Download functions now properly handle network interruptions
+- Deezer API base URL changed to `https://api.deezer.com/2.0`
+
+## [2.1.0] - 2026-01-06
+
+### Added
+- **Service Switcher in Quality Picker**: Choose download service (Tidal/Qobuz/Amazon) directly when selecting quality
+  - Service selector chips appear above quality options
+  - Defaults to your preferred service from settings
+  - Change service on-the-fly without going to settings
+  - Available in Home, Album, and Playlist screens
+- **AMOLED Dark Theme**: Pure black background for OLED screens
+  - Toggle in Settings > Appearance > Theme
+  - Saves battery on OLED/AMOLED displays
+  - All surface colors adjusted for true black background
+- **Update Channel Setting**: Choose between Stable and Preview release channels
+  - Stable: Only receive stable release notifications
+  - Preview: Get notified about preview/beta releases too
+  - Configure in Settings > Options > App
+
+### Changed
+- **Reduced APK Size**: Replaced FFmpeg plugin with custom AAR containing only required codecs
+  - arm64 APK: 46.6 MB (previously 51 MB)
+  - arm32 APK: 59 MB (previously 64 MB)
+  - Only includes FLAC, MP3 (LAME), and AAC codecs
+  - Custom FFmpeg AAR with arm64-v8a and armeabi-v7a only
+  - Native MethodChannel bridge for FFmpeg operations
+  - Separate iOS build configuration with ffmpeg_kit_flutter plugin
+
+### Fixed
+- **Retry Failed Downloads**: Fixed issue where retrying failed downloads sometimes did nothing
+  - Now properly handles retry when queue processing has finished
+  - Also allows retrying skipped (cancelled) downloads
+- **Lyrics Loading Timeout**: Added 20 second timeout for lyrics fetching
+  - Shows "Lyrics not available" instead of loading forever
+- **iOS Directory Picker**: Fixed unable to select download folder on iOS
+  - iOS limitation: Empty folders cannot be selected via document picker
+  - Added "App Documents Folder" option as recommended default
+  - Files saved to app Documents folder are accessible via iOS Files app
+
+### Performance
+- **Download Speed Optimizations**: Significant improvements to download initialization and throughput
+  - Token caching for Tidal (eliminates redundant auth requests)
+  - Singleton pattern for all downloaders (HTTP connection reuse)
+  - ISRC search first strategy (faster than SongLink API)
+  - Track ID cache with 30 minute TTL for album/playlist downloads
+  - Pre-warm cache when viewing album/playlist
+  - Parallel cover art and lyrics fetching during audio download
+  - 64KB HTTP read/write buffers
+  - 256KB buffered file writer for all downloaders
+  - Progress updates every 64KB (reduced lock contention)
+- **Amazon Music Optimizations**: Same optimizations now applied to Amazon downloader
+
+## [2.1.0-preview2] - 2026-01-06
+
+### Added
+- **Service Switcher in Quality Picker**: Choose download service (Tidal/Qobuz/Amazon) directly when selecting quality
+  - Service selector chips appear above quality options
+  - Defaults to your preferred service from settings
+  - Change service on-the-fly without going to settings
+  - Available in Home, Album, and Playlist screens
+- **AMOLED Dark Theme**: Pure black background for OLED screens
+  - Toggle in Settings > Appearance > Theme
+  - Saves battery on OLED/AMOLED displays
+  - All surface colors adjusted for true black background
+- **Update Channel Setting**: Choose between Stable and Preview release channels
+  - Stable: Only receive stable release notifications
+  - Preview: Get notified about preview/beta releases too
+  - Configure in Settings > Options > App
+
+### Fixed
+- **Retry Failed Downloads**: Fixed issue where retrying failed downloads sometimes did nothing
+  - Now properly handles retry when queue processing has finished
+  - Also allows retrying skipped (cancelled) downloads
+  - Added logging for better debugging
+- **Lyrics Loading Timeout**: Added 20 second timeout for lyrics fetching
+  - Shows "Lyrics not available" instead of loading forever
+  - Better error messages for timeout and not found cases
+
+## [2.1.0-preview] - 2026-01-06
+
+### Performance
+- **Download Speed Optimizations**: Significant improvements to download initialization and throughput
+  - Token caching for Tidal (eliminates redundant auth requests)
+  - Singleton pattern for all downloaders (HTTP connection reuse)
+  - ISRC search first strategy (faster than SongLink API)
+  - Track ID cache with 30 minute TTL for album/playlist downloads
+  - Pre-warm cache when viewing album/playlist
+  - Parallel cover art and lyrics fetching during audio download
+  - 64KB HTTP read/write buffers
+  - 256KB buffered file writer for all downloaders
+  - Progress updates every 64KB (reduced lock contention)
+- **Amazon Music Optimizations**: Same optimizations now applied to Amazon downloader
+
+### Technical
+- New `go_backend/parallel.go` with `TrackIDCache`, `FetchCoverAndLyricsParallel()`, `PreWarmTrackCache()`
+- Flutter: `_preWarmCacheForTracks()` in `track_provider.dart`
+- New method channels: `preWarmTrackCache`, `getTrackCacheSize`, `clearTrackCache`
+
+## [2.0.7-preview2] - 2026-01-06
+
+### Fixed
+- **iOS Directory Picker**: Fixed unable to select download folder on iOS
+  - iOS limitation: Empty folders cannot be selected via document picker
+  - Added "App Documents Folder" option as recommended default
+  - Shows info message explaining iOS limitation
+  - Files saved to app Documents folder are accessible via iOS Files app
+
+## [2.0.7-preview] - 2026-01-05
+
+### Changed
+- **Reduced APK Size**: Replaced FFmpeg plugin with custom AAR containing only required codecs
+  - arm64 APK: 46.6 MB (previously 51 MB)
+  - arm32 APK: 59 MB (previously 64 MB)
+  - Only includes FLAC, MP3 (LAME), and AAC codecs
+  - Removed x86/x86_64 architectures (emulator only)
+
+### Technical
+- Custom FFmpeg AAR with arm64-v8a and armeabi-v7a only
+- Native MethodChannel bridge for FFmpeg operations
+- Separate iOS build configuration with ffmpeg_kit_flutter plugin
+
 ## [2.0.6] - 2026-01-05
 
 ### Fixed

README.md

@@ -1,4 +1,5 @@
 [![GitHub All Releases](https://img.shields.io/github/downloads/zarzet/SpotiFLAC-Mobile/total?style=for-the-badge)](https://github.com/zarzet/SpotiFLAC-Mobile/releases)
+[![VirusTotal](https://img.shields.io/badge/VirusTotal-Safe-brightgreen?style=for-the-badge&logo=virustotal)](https://www.virustotal.com/gui/file/9092dd9300289ceadd8e70cd71706a3ba32225d9cb2ae8b12648611d31814708)
 
 <div align="center">
 
@@ -22,11 +23,30 @@ Get Spotify tracks in true FLAC from Tidal, Qobuz & Amazon Music — no account
   <img src="assets/images/4.jpg?v=2" width="200" />
 </p>
 
+## Metadata Source
+
+SpotiFLAC supports two metadata sources for searching tracks:
+
+| Source | Pros | Cons |
+|--------|------|------|
+| **Deezer** (Default) | No developer account needed, rate limit per user IP | Slightly less comprehensive catalog |
+| **Spotify** | More comprehensive catalog, better search results | Requires developer API credentials to avoid rate limiting |
+
+### Using Spotify
+To use Spotify as your search source without hitting rate limits:
+1. Create a Spotify Developer account at [developer.spotify.com](https://developer.spotify.com)
+2. Create an app to get your Client ID and Client Secret
+3. Go to **Settings > Options > Spotify API > Custom Credentials**
+4. Enter your Client ID and Secret
+5. Change **Search Source** to Spotify
+
 ## Other project
 
 ### [SpotiFLAC (Desktop)](https://github.com/afkarxyz/SpotiFLAC)
 Get Spotify tracks in true FLAC from Tidal, Qobuz & Amazon Music for Windows, macOS & Linux
 
+[![Ko-fi](https://img.shields.io/badge/Ko--fi-Support%20Me-FF5E5B?style=for-the-badge&logo=ko-fi&logoColor=white)](https://ko-fi.com/zarzet)
+
 ## Disclaimer
 
 > **iOS Support**: This app is primarily tested on Android. iOS support is experimental and may have bugs — the developer is too poor to afford an iPhone for proper testing. If you encounter issues on iOS, please report them!

android/app/build.gradle.kts

@@ -95,6 +95,7 @@ repositories {
 dependencies {
     coreLibraryDesugaring("com.android.tools:desugar_jdk_libs:2.1.4")
     implementation(files("libs/gobackend.aar"))
+    implementation(files("libs/ffmpeg-kit-with-lame.aar"))
     implementation("org.jetbrains.kotlinx:kotlinx-coroutines-android:1.7.3")
     implementation("androidx.lifecycle:lifecycle-runtime-ktx:2.7.0")
 }

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

@@ -5,6 +5,8 @@ import io.flutter.embedding.android.FlutterActivity
 import io.flutter.embedding.engine.FlutterEngine
 import io.flutter.plugin.common.MethodChannel
 import gobackend.Gobackend
+import com.arthenica.ffmpegkit.FFmpegKit
+import com.arthenica.ffmpegkit.ReturnCode
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.SupervisorJob
@@ -13,6 +15,7 @@ import kotlinx.coroutines.withContext
 
 class MainActivity: FlutterActivity() {
     private val CHANNEL = "com.zarz.spotiflac/backend"
+    private val FFMPEG_CHANNEL = "com.zarz.spotiflac/ffmpeg"
     private val scope = CoroutineScope(SupervisorJob() + Dispatchers.Main)
 
     override fun onNewIntent(intent: Intent) {
@@ -208,6 +211,72 @@ class MainActivity: FlutterActivity() {
                             }
                             result.success(null)
                         }
+                        "preWarmTrackCache" -> {
+                            val tracksJson = call.argument<String>("tracks") ?: "[]"
+                            withContext(Dispatchers.IO) {
+                                Gobackend.preWarmTrackCacheJSON(tracksJson)
+                            }
+                            result.success(null)
+                        }
+                        "getTrackCacheSize" -> {
+                            val size = withContext(Dispatchers.IO) {
+                                Gobackend.getTrackCacheSize()
+                            }
+                            result.success(size.toInt())
+                        }
+                        "clearTrackCache" -> {
+                            withContext(Dispatchers.IO) {
+                                Gobackend.clearTrackIDCache()
+                            }
+                            result.success(null)
+                        }
+                        // Deezer API methods
+                        "searchDeezerAll" -> {
+                            val query = call.argument<String>("query") ?: ""
+                            val trackLimit = call.argument<Int>("track_limit") ?: 15
+                            val artistLimit = call.argument<Int>("artist_limit") ?: 3
+                            val response = withContext(Dispatchers.IO) {
+                                Gobackend.searchDeezerAll(query, trackLimit.toLong(), artistLimit.toLong())
+                            }
+                            result.success(response)
+                        }
+                        "getDeezerMetadata" -> {
+                            val resourceType = call.argument<String>("resource_type") ?: ""
+                            val resourceId = call.argument<String>("resource_id") ?: ""
+                            val response = withContext(Dispatchers.IO) {
+                                Gobackend.getDeezerMetadata(resourceType, resourceId)
+                            }
+                            result.success(response)
+                        }
+                        "parseDeezerUrl" -> {
+                            val url = call.argument<String>("url") ?: ""
+                            val response = withContext(Dispatchers.IO) {
+                                Gobackend.parseDeezerURLExport(url)
+                            }
+                            result.success(response)
+                        }
+                        "searchDeezerByISRC" -> {
+                            val isrc = call.argument<String>("isrc") ?: ""
+                            val response = withContext(Dispatchers.IO) {
+                                Gobackend.searchDeezerByISRC(isrc)
+                            }
+                            result.success(response)
+                        }
+                        "convertSpotifyToDeezer" -> {
+                            val resourceType = call.argument<String>("resource_type") ?: ""
+                            val spotifyId = call.argument<String>("spotify_id") ?: ""
+                            val response = withContext(Dispatchers.IO) {
+                                Gobackend.convertSpotifyToDeezer(resourceType, spotifyId)
+                            }
+                            result.success(response)
+                        }
+                        "getSpotifyMetadataWithFallback" -> {
+                            val url = call.argument<String>("url") ?: ""
+                            val response = withContext(Dispatchers.IO) {
+                                Gobackend.getSpotifyMetadataWithDeezerFallback(url)
+                            }
+                            result.success(response)
+                        }
                         else -> result.notImplemented()
                     }
                 } catch (e: Exception) {
@@ -215,5 +284,37 @@ class MainActivity: FlutterActivity() {
                 }
             }
         }
+        
+        // FFmpeg method channel
+        MethodChannel(flutterEngine.dartExecutor.binaryMessenger, FFMPEG_CHANNEL).setMethodCallHandler { call, result ->
+            scope.launch {
+                try {
+                    when (call.method) {
+                        "execute" -> {
+                            val command = call.argument<String>("command") ?: ""
+                            val session = withContext(Dispatchers.IO) {
+                                FFmpegKit.execute(command)
+                            }
+                            val returnCode = session.returnCode
+                            val output = session.output ?: ""
+                            result.success(mapOf(
+                                "success" to ReturnCode.isSuccess(returnCode),
+                                "returnCode" to (returnCode?.value ?: -1),
+                                "output" to output
+                            ))
+                        }
+                        "getVersion" -> {
+                            val session = withContext(Dispatchers.IO) {
+                                FFmpegKit.execute("-version")
+                            }
+                            result.success(session.output ?: "unknown")
+                        }
+                        else -> result.notImplemented()
+                    }
+                } catch (e: Exception) {
+                    result.error("FFMPEG_ERROR", e.message, null)
+                }
+            }
+        }
     }
 }

build_assets/ffmpeg_service_ios.dart

@@ -0,0 +1,136 @@
+import 'dart:io';
+import 'package:ffmpeg_kit_flutter_new_audio/ffmpeg_kit.dart';
+import 'package:ffmpeg_kit_flutter_new_audio/return_code.dart';
+import 'package:spotiflac_android/utils/logger.dart';
+
+final _log = AppLogger('FFmpeg');
+
+/// FFmpeg service for iOS using ffmpeg_kit_flutter plugin
+class FFmpegServiceIOS {
+  /// Execute FFmpeg command and return result
+  static Future<FFmpegResultIOS> _execute(String command) async {
+    try {
+      final session = await FFmpegKit.execute(command);
+      final returnCode = await session.getReturnCode();
+      final output = await session.getOutput() ?? '';
+      return FFmpegResultIOS(
+        success: ReturnCode.isSuccess(returnCode),
+        returnCode: returnCode?.getValue() ?? -1,
+        output: output,
+      );
+    } catch (e) {
+      _log.e('FFmpeg execute error: $e');
+      return FFmpegResultIOS(success: false, returnCode: -1, output: e.toString());
+    }
+  }
+
+  /// Convert M4A (DASH segments) to FLAC
+  static Future<String?> convertM4aToFlac(String inputPath) async {
+    final outputPath = inputPath.replaceAll('.m4a', '.flac');
+    final command = '-i "$inputPath" -c:a flac -compression_level 8 "$outputPath" -y';
+    final result = await _execute(command);
+
+    if (result.success) {
+      try {
+        await File(inputPath).delete();
+      } catch (_) {}
+      return outputPath;
+    }
+
+    _log.e('M4A to FLAC conversion failed: ${result.output}');
+    return null;
+  }
+
+  /// Convert FLAC to MP3
+  static Future<String?> convertFlacToMp3(String inputPath, {String bitrate = '320k'}) async {
+    final dir = File(inputPath).parent.path;
+    final baseName = inputPath.split(Platform.pathSeparator).last.replaceAll('.flac', '');
+    final outputDir = '$dir${Platform.pathSeparator}MP3';
+    await Directory(outputDir).create(recursive: true);
+    final outputPath = '$outputDir${Platform.pathSeparator}$baseName.mp3';
+
+    final command = '-i "$inputPath" -codec:a libmp3lame -b:a $bitrate -map 0:a -map_metadata 0 -id3v2_version 3 "$outputPath" -y';
+    final result = await _execute(command);
+
+    if (result.success) return outputPath;
+    _log.e('FLAC to MP3 conversion failed: ${result.output}');
+    return null;
+  }
+
+  /// Convert FLAC to M4A
+  static Future<String?> convertFlacToM4a(String inputPath, {String codec = 'aac', String bitrate = '256k'}) async {
+    final dir = File(inputPath).parent.path;
+    final baseName = inputPath.split(Platform.pathSeparator).last.replaceAll('.flac', '');
+    final outputDir = '$dir${Platform.pathSeparator}M4A';
+    await Directory(outputDir).create(recursive: true);
+    final outputPath = '$outputDir${Platform.pathSeparator}$baseName.m4a';
+
+    String command;
+    if (codec == 'alac') {
+      command = '-i "$inputPath" -codec:a alac -map 0:a -map_metadata 0 "$outputPath" -y';
+    } else {
+      command = '-i "$inputPath" -codec:a aac -b:a $bitrate -map 0:a -map_metadata 0 "$outputPath" -y';
+    }
+
+    final result = await _execute(command);
+    if (result.success) return outputPath;
+    _log.e('FLAC to M4A conversion failed: ${result.output}');
+    return null;
+  }
+
+  /// Embed cover art to FLAC file
+  static Future<String?> embedCover(String flacPath, String coverPath) async {
+    final tempOutput = '$flacPath.tmp';
+    final command = '-i "$flacPath" -i "$coverPath" -map 0:a -map 1:0 -c copy -metadata:s:v title="Album cover" -metadata:s:v comment="Cover (front)" -disposition:v attached_pic "$tempOutput" -y';
+
+    final result = await _execute(command);
+
+    if (result.success) {
+      try {
+        await File(flacPath).delete();
+        await File(tempOutput).rename(flacPath);
+        return flacPath;
+      } catch (e) {
+        _log.e('Failed to replace file after cover embed: $e');
+        return null;
+      }
+    }
+
+    try {
+      final tempFile = File(tempOutput);
+      if (await tempFile.exists()) await tempFile.delete();
+    } catch (_) {}
+
+    _log.e('Cover embed failed: ${result.output}');
+    return null;
+  }
+
+  /// Check if FFmpeg is available
+  static Future<bool> isAvailable() async {
+    try {
+      final session = await FFmpegKit.execute('-version');
+      final returnCode = await session.getReturnCode();
+      return ReturnCode.isSuccess(returnCode);
+    } catch (e) {
+      return false;
+    }
+  }
+
+  /// Get FFmpeg version info
+  static Future<String?> getVersion() async {
+    try {
+      final session = await FFmpegKit.execute('-version');
+      return await session.getOutput();
+    } catch (e) {
+      return null;
+    }
+  }
+}
+
+class FFmpegResultIOS {
+  final bool success;
+  final int returnCode;
+  final String output;
+
+  FFmpegResultIOS({required this.success, required this.returnCode, required this.output});
+}

go_backend/amazon.go

@@ -1,6 +1,7 @@
 package gobackend
 
 import (
+	"bufio"
 	"encoding/base64"
 	"encoding/json"
 	"fmt"
@@ -10,6 +11,7 @@ import (
 	"os"
 	"path/filepath"
 	"strings"
+	"sync"
 	"time"
 )
 
@@ -19,6 +21,12 @@ type AmazonDownloader struct {
 	regions []string // us, eu regions for DoubleDouble service
 }
 
+var (
+	// Global Amazon downloader instance for connection reuse
+	globalAmazonDownloader *AmazonDownloader
+	amazonDownloaderOnce   sync.Once
+)
+
 // DoubleDoubleSubmitResponse is the response from DoubleDouble submit endpoint
 type DoubleDoubleSubmitResponse struct {
 	Success bool   `json:"success"`
@@ -93,12 +101,15 @@ func amazonIsASCIIString(s string) bool {
 	return true
 }
 
-// NewAmazonDownloader creates a new Amazon downloader using DoubleDouble service
+// NewAmazonDownloader creates a new Amazon downloader (returns singleton for connection reuse)
 func NewAmazonDownloader() *AmazonDownloader {
-	return &AmazonDownloader{
+	amazonDownloaderOnce.Do(func() {
-		client:  NewHTTPClientWithTimeout(120 * time.Second), // 120s timeout like PC
+		globalAmazonDownloader = &AmazonDownloader{
-		regions: []string{"us", "eu"},                        // Same regions as PC
+			client:  NewHTTPClientWithTimeout(120 * time.Second), // 120s timeout like PC
-	}
+			regions: []string{"us", "eu"},                        // Same regions as PC
+		}
+	})
+	return globalAmazonDownloader
 }
 
 // GetAvailableAPIs returns list of available DoubleDouble regions
@@ -283,31 +294,55 @@ func (a *AmazonDownloader) DownloadFile(downloadURL, outputPath, itemID string)
 		return fmt.Errorf("download failed: HTTP %d", resp.StatusCode)
 	}
 
+	expectedSize := resp.ContentLength
 	// Set total bytes if available
-	if resp.ContentLength > 0 && itemID != "" {
+	if expectedSize > 0 && itemID != "" {
-		SetItemBytesTotal(itemID, resp.ContentLength)
+		SetItemBytesTotal(itemID, expectedSize)
 	}
 
 	out, err := os.Create(outputPath)
 	if err != nil {
 		return err
 	}
-	defer out.Close()
 
-	// Use item progress writer
+	// Use buffered writer for better performance (256KB buffer)
-	var bytesWritten int64
+	bufWriter := bufio.NewWriterSize(out, 256*1024)
+
+	// Use item progress writer with buffered output
+	var written int64
 	if itemID != "" {
-		pw := NewItemProgressWriter(out, itemID)
+		pw := NewItemProgressWriter(bufWriter, itemID)
-		bytesWritten, err = io.Copy(pw, resp.Body)
+		written, err = io.Copy(pw, resp.Body)
 	} else {
 		// Fallback: direct copy without progress tracking
-		bytesWritten, err = io.Copy(out, resp.Body)
+		written, err = io.Copy(bufWriter, resp.Body)
-	}
-	if err != nil {
-		return fmt.Errorf("failed to write file: %w", err)
 	}
 
-	fmt.Printf("\r[Amazon] Downloaded: %.2f MB (Complete)\n", float64(bytesWritten)/(1024*1024))
+	// Flush buffer before checking for errors
+	flushErr := bufWriter.Flush()
+	closeErr := out.Close()
+
+	// Check for any errors
+	if err != nil {
+		os.Remove(outputPath)
+		return fmt.Errorf("download interrupted: %w", err)
+	}
+	if flushErr != nil {
+		os.Remove(outputPath)
+		return fmt.Errorf("failed to flush buffer: %w", flushErr)
+	}
+	if closeErr != nil {
+		os.Remove(outputPath)
+		return fmt.Errorf("failed to close file: %w", closeErr)
+	}
+
+	// Verify file size if Content-Length was provided
+	if expectedSize > 0 && written != expectedSize {
+		os.Remove(outputPath)
+		return fmt.Errorf("incomplete download: expected %d bytes, got %d bytes", expectedSize, written)
+	}
+
+	fmt.Printf("\r[Amazon] Downloaded: %.2f MB (Complete)\n", float64(written)/(1024*1024))
 	return nil
 }
 
@@ -378,11 +413,29 @@ func downloadFromAmazon(req DownloadRequest) (AmazonDownloadResult, error) {
 		return AmazonDownloadResult{FilePath: "EXISTS:" + outputPath}, nil
 	}
 
-	// Download file with item ID for progress tracking
+	// START PARALLEL: Fetch cover and lyrics while downloading audio
+	var parallelResult *ParallelDownloadResult
+	parallelDone := make(chan struct{})
+	go func() {
+		defer close(parallelDone)
+		parallelResult = FetchCoverAndLyricsParallel(
+			req.CoverURL,
+			req.EmbedMaxQualityCover,
+			req.SpotifyID,
+			req.TrackName,
+			req.ArtistName,
+			req.EmbedLyrics,
+		)
+	}()
+
+	// Download audio file with item ID for progress tracking
 	if err := downloader.DownloadFile(downloadURL, outputPath, req.ItemID); err != nil {
 		return AmazonDownloadResult{}, fmt.Errorf("download failed: %w", err)
 	}
 
+	// Wait for parallel operations to complete
+	<-parallelDone
+
 	// Set progress to 100% and status to finalizing (before embedding)
 	// This makes the UI show "Finalizing..." while embedding happens
 	if req.ItemID != "" {
@@ -408,41 +461,27 @@ func downloadFromAmazon(req DownloadRequest) (AmazonDownloadResult, error) {
 		ISRC:        req.ISRC,
 	}
 
-	// Download cover to memory (avoids file permission issues on Android)
+	// Use cover data from parallel fetch
 	var coverData []byte
-	if req.CoverURL != "" {
+	if parallelResult != nil && parallelResult.CoverData != nil {
-		fmt.Println("[Amazon] Downloading cover to memory...")
+		coverData = parallelResult.CoverData
-		data, err := downloadCoverToMemory(req.CoverURL, req.EmbedMaxQualityCover)
+		fmt.Printf("[Amazon] Using parallel-fetched cover (%d bytes)\n", len(coverData))
-		if err == nil {
-			coverData = data
-			fmt.Printf("[Amazon] Cover downloaded successfully (%d bytes)\n", len(coverData))
-		} else {
-			fmt.Printf("[Amazon] Warning: failed to download cover: %v\n", err)
-		}
 	}
 
 	if err := EmbedMetadataWithCoverData(outputPath, metadata, coverData); err != nil {
 		fmt.Printf("Warning: failed to embed metadata: %v\n", err)
 	}
 
-	// Embed lyrics if enabled
+	// Embed lyrics from parallel fetch
-	if req.EmbedLyrics {
+	if req.EmbedLyrics && parallelResult != nil && parallelResult.LyricsLRC != "" {
-		fmt.Println("[Amazon] Fetching lyrics...")
+		fmt.Printf("[Amazon] Embedding parallel-fetched lyrics (%d lines)...\n", len(parallelResult.LyricsData.Lines))
-		lyricsClient := NewLyricsClient()
+		if embedErr := EmbedLyrics(outputPath, parallelResult.LyricsLRC); embedErr != nil {
-		lyrics, lyricsErr := lyricsClient.FetchLyricsAllSources(req.SpotifyID, req.TrackName, req.ArtistName)
+			fmt.Printf("[Amazon] Warning: failed to embed lyrics: %v\n", embedErr)
-		if lyricsErr != nil {
-			fmt.Printf("[Amazon] Warning: lyrics fetch error: %v\n", lyricsErr)
-		} else if lyrics == nil || len(lyrics.Lines) == 0 {
-			fmt.Println("[Amazon] No lyrics found for this track")
 		} else {
-			fmt.Printf("[Amazon] Lyrics found (%d lines), embedding...\n", len(lyrics.Lines))
+			fmt.Println("[Amazon] Lyrics embedded successfully")
-			lrcContent := convertToLRC(lyrics)
-			if embedErr := EmbedLyrics(outputPath, lrcContent); embedErr != nil {
-				fmt.Printf("[Amazon] Warning: failed to embed lyrics: %v\n", embedErr)
-			} else {
-				fmt.Println("[Amazon] Lyrics embedded successfully")
-			}
 		}
+	} else if req.EmbedLyrics {
+		fmt.Println("[Amazon] No lyrics available from parallel fetch")
 	}
 
 	fmt.Println("[Amazon] ✓ Downloaded successfully from Amazon Music")

go_backend/deezer.go

@@ -0,0 +1,612 @@
+package gobackend
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"strings"
+	"sync"
+	"time"
+)
+
+const (
+	deezerBaseURL     = "https://api.deezer.com/2.0"
+	deezerSearchURL   = deezerBaseURL + "/search"
+	deezerTrackURL    = deezerBaseURL + "/track/%s"
+	deezerAlbumURL    = deezerBaseURL + "/album/%s"
+	deezerArtistURL   = deezerBaseURL + "/artist/%s"
+	deezerPlaylistURL = deezerBaseURL + "/playlist/%s"
+	
+	deezerCacheTTL = 10 * time.Minute
+)
+
+// DeezerClient handles Deezer API interactions (no auth required)
+type DeezerClient struct {
+	httpClient  *http.Client
+	searchCache map[string]*cacheEntry
+	albumCache  map[string]*cacheEntry
+	artistCache map[string]*cacheEntry
+	cacheMu     sync.RWMutex
+}
+
+// Singleton instance
+var (
+	deezerClient     *DeezerClient
+	deezerClientOnce sync.Once
+)
+
+// GetDeezerClient returns singleton Deezer client
+func GetDeezerClient() *DeezerClient {
+	deezerClientOnce.Do(func() {
+		deezerClient = &DeezerClient{
+			httpClient:  NewHTTPClientWithTimeout(15 * time.Second),
+			searchCache: make(map[string]*cacheEntry),
+			albumCache:  make(map[string]*cacheEntry),
+			artistCache: make(map[string]*cacheEntry),
+		}
+	})
+	return deezerClient
+}
+
+// Deezer API response types
+type deezerTrack struct {
+	ID             int64  `json:"id"`
+	Title          string `json:"title"`
+	Duration       int    `json:"duration"` // in seconds
+	TrackPosition  int    `json:"track_position"`
+	DiskNumber     int    `json:"disk_number"`
+	ISRC           string `json:"isrc"`
+	Link           string `json:"link"`
+	Artist         deezerArtist `json:"artist"`
+	Album          deezerAlbumSimple `json:"album"`
+	Contributors   []deezerArtist `json:"contributors"`
+}
+
+type deezerArtist struct {
+	ID        int64  `json:"id"`
+	Name      string `json:"name"`
+	Picture   string `json:"picture"`
+	PictureMedium string `json:"picture_medium"`
+	PictureBig    string `json:"picture_big"`
+	PictureXL     string `json:"picture_xl"`
+	NbFan     int    `json:"nb_fan"`
+}
+
+type deezerAlbumSimple struct {
+	ID          int64  `json:"id"`
+	Title       string `json:"title"`
+	Cover       string `json:"cover"`
+	CoverMedium string `json:"cover_medium"`
+	CoverBig    string `json:"cover_big"`
+	CoverXL     string `json:"cover_xl"`
+}
+
+type deezerAlbumFull struct {
+	ID          int64  `json:"id"`
+	Title       string `json:"title"`
+	Cover       string `json:"cover"`
+	CoverMedium string `json:"cover_medium"`
+	CoverBig    string `json:"cover_big"`
+	CoverXL     string `json:"cover_xl"`
+	ReleaseDate string `json:"release_date"`
+	NbTracks    int    `json:"nb_tracks"`
+	Artist      deezerArtist `json:"artist"`
+	Contributors []deezerArtist `json:"contributors"`
+	Tracks      struct {
+		Data []deezerTrack `json:"data"`
+	} `json:"tracks"`
+}
+
+type deezerArtistFull struct {
+	ID            int64  `json:"id"`
+	Name          string `json:"name"`
+	Picture       string `json:"picture"`
+	PictureMedium string `json:"picture_medium"`
+	PictureBig    string `json:"picture_big"`
+	PictureXL     string `json:"picture_xl"`
+	NbFan         int    `json:"nb_fan"`
+	NbAlbum       int    `json:"nb_album"`
+}
+
+type deezerPlaylistFull struct {
+	ID          int64  `json:"id"`
+	Title       string `json:"title"`
+	Picture     string `json:"picture"`
+	PictureMedium string `json:"picture_medium"`
+	PictureBig    string `json:"picture_big"`
+	PictureXL     string `json:"picture_xl"`
+	NbTracks    int    `json:"nb_tracks"`
+	Creator     struct {
+		Name string `json:"name"`
+	} `json:"creator"`
+	Tracks      struct {
+		Data []deezerTrack `json:"data"`
+	} `json:"tracks"`
+}
+
+// SearchAll searches for tracks and artists on Deezer
+func (c *DeezerClient) SearchAll(ctx context.Context, query string, trackLimit, artistLimit int) (*SearchAllResult, error) {
+	cacheKey := fmt.Sprintf("deezer:all:%s:%d:%d", query, trackLimit, artistLimit)
+	
+	c.cacheMu.RLock()
+	if entry, ok := c.searchCache[cacheKey]; ok && !entry.isExpired() {
+		c.cacheMu.RUnlock()
+		return entry.data.(*SearchAllResult), nil
+	}
+	c.cacheMu.RUnlock()
+
+	result := &SearchAllResult{
+		Tracks:  make([]TrackMetadata, 0),
+		Artists: make([]SearchArtistResult, 0),
+	}
+
+	// Search tracks
+	trackURL := fmt.Sprintf("%s/track?q=%s&limit=%d", deezerSearchURL, url.QueryEscape(query), trackLimit)
+	var trackResp struct {
+		Data []deezerTrack `json:"data"`
+	}
+	if err := c.getJSON(ctx, trackURL, &trackResp); err != nil {
+		return nil, fmt.Errorf("deezer track search failed: %w", err)
+	}
+
+	for _, track := range trackResp.Data {
+		// Fetch full track info to get ISRC (search results don't include ISRC)
+		fullTrack, err := c.fetchFullTrack(ctx, fmt.Sprintf("%d", track.ID))
+		if err == nil && fullTrack != nil {
+			result.Tracks = append(result.Tracks, c.convertTrack(*fullTrack))
+		} else {
+			// Fallback to search result without ISRC
+			result.Tracks = append(result.Tracks, c.convertTrack(track))
+		}
+	}
+
+	// Search artists
+	artistURL := fmt.Sprintf("%s/artist?q=%s&limit=%d", deezerSearchURL, url.QueryEscape(query), artistLimit)
+	var artistResp struct {
+		Data []deezerArtist `json:"data"`
+	}
+	if err := c.getJSON(ctx, artistURL, &artistResp); err == nil {
+		for _, artist := range artistResp.Data {
+			result.Artists = append(result.Artists, SearchArtistResult{
+				ID:         fmt.Sprintf("deezer:%d", artist.ID),
+				Name:       artist.Name,
+				Images:     c.getBestArtistImage(artist),
+				Followers:  artist.NbFan,
+				Popularity: 0,
+			})
+		}
+	}
+
+	// Cache result
+	c.cacheMu.Lock()
+	c.searchCache[cacheKey] = &cacheEntry{
+		data:      result,
+		expiresAt: time.Now().Add(deezerCacheTTL),
+	}
+	c.cacheMu.Unlock()
+
+	return result, nil
+}
+
+// GetTrack fetches a single track by Deezer ID
+func (c *DeezerClient) GetTrack(ctx context.Context, trackID string) (*TrackResponse, error) {
+	trackURL := fmt.Sprintf(deezerTrackURL, trackID)
+	
+	var track deezerTrack
+	if err := c.getJSON(ctx, trackURL, &track); err != nil {
+		return nil, err
+	}
+
+	return &TrackResponse{
+		Track: c.convertTrack(track),
+	}, nil
+}
+
+// GetAlbum fetches album with tracks
+func (c *DeezerClient) GetAlbum(ctx context.Context, albumID string) (*AlbumResponsePayload, error) {
+	c.cacheMu.RLock()
+	if entry, ok := c.albumCache[albumID]; ok && !entry.isExpired() {
+		c.cacheMu.RUnlock()
+		return entry.data.(*AlbumResponsePayload), nil
+	}
+	c.cacheMu.RUnlock()
+
+	albumURL := fmt.Sprintf(deezerAlbumURL, albumID)
+	
+	var album deezerAlbumFull
+	if err := c.getJSON(ctx, albumURL, &album); err != nil {
+		return nil, err
+	}
+
+	albumImage := c.getBestAlbumImage(album)
+	artistName := album.Artist.Name
+	if len(album.Contributors) > 0 {
+		names := make([]string, len(album.Contributors))
+		for i, a := range album.Contributors {
+			names[i] = a.Name
+		}
+		artistName = strings.Join(names, ", ")
+	}
+
+	info := AlbumInfoMetadata{
+		TotalTracks: album.NbTracks,
+		Name:        album.Title,
+		ReleaseDate: album.ReleaseDate,
+		Artists:     artistName,
+		Images:      albumImage,
+	}
+
+	tracks := make([]AlbumTrackMetadata, 0, len(album.Tracks.Data))
+	for _, track := range album.Tracks.Data {
+		// Need to fetch full track info for ISRC
+		fullTrack, _ := c.fetchFullTrack(ctx, fmt.Sprintf("%d", track.ID))
+		isrc := ""
+		if fullTrack != nil {
+			isrc = fullTrack.ISRC
+		}
+
+		tracks = append(tracks, AlbumTrackMetadata{
+			SpotifyID:   fmt.Sprintf("deezer:%d", track.ID),
+			Artists:     track.Artist.Name,
+			Name:        track.Title,
+			AlbumName:   album.Title,
+			AlbumArtist: artistName,
+			DurationMS:  track.Duration * 1000,
+			Images:      albumImage,
+			ReleaseDate: album.ReleaseDate,
+			TrackNumber: track.TrackPosition,
+			TotalTracks: album.NbTracks,
+			DiscNumber:  track.DiskNumber,
+			ExternalURL: track.Link,
+			ISRC:        isrc,
+			AlbumID:     fmt.Sprintf("deezer:%d", album.ID),
+		})
+	}
+
+	result := &AlbumResponsePayload{
+		AlbumInfo: info,
+		TrackList: tracks,
+	}
+
+	c.cacheMu.Lock()
+	c.albumCache[albumID] = &cacheEntry{
+		data:      result,
+		expiresAt: time.Now().Add(deezerCacheTTL),
+	}
+	c.cacheMu.Unlock()
+
+	return result, nil
+}
+
+// GetArtist fetches artist with albums
+func (c *DeezerClient) GetArtist(ctx context.Context, artistID string) (*ArtistResponsePayload, error) {
+	c.cacheMu.RLock()
+	if entry, ok := c.artistCache[artistID]; ok && !entry.isExpired() {
+		c.cacheMu.RUnlock()
+		return entry.data.(*ArtistResponsePayload), nil
+	}
+	c.cacheMu.RUnlock()
+
+	// Fetch artist info
+	artistURL := fmt.Sprintf(deezerArtistURL, artistID)
+	var artist deezerArtistFull
+	if err := c.getJSON(ctx, artistURL, &artist); err != nil {
+		return nil, err
+	}
+
+	artistInfo := ArtistInfoMetadata{
+		ID:         fmt.Sprintf("deezer:%d", artist.ID),
+		Name:       artist.Name,
+		Images:     c.getBestArtistImageFull(artist),
+		Followers:  artist.NbFan,
+		Popularity: 0,
+	}
+
+	// Fetch artist albums
+	albumsURL := fmt.Sprintf("%s/albums?limit=100", fmt.Sprintf(deezerArtistURL, artistID))
+	var albumsResp struct {
+		Data []struct {
+			ID          int64  `json:"id"`
+			Title       string `json:"title"`
+			ReleaseDate string `json:"release_date"`
+			NbTracks    int    `json:"nb_tracks"`
+			Cover       string `json:"cover"`
+			CoverMedium string `json:"cover_medium"`
+			CoverBig    string `json:"cover_big"`
+			CoverXL     string `json:"cover_xl"`
+			RecordType  string `json:"record_type"` // album, single, ep, compile
+		} `json:"data"`
+	}
+
+	albums := make([]ArtistAlbumMetadata, 0)
+	if err := c.getJSON(ctx, albumsURL, &albumsResp); err == nil {
+		for _, album := range albumsResp.Data {
+			albumType := album.RecordType
+			if albumType == "compile" {
+				albumType = "compilation"
+			}
+			
+			coverURL := album.CoverXL
+			if coverURL == "" {
+				coverURL = album.CoverBig
+			}
+			if coverURL == "" {
+				coverURL = album.CoverMedium
+			}
+			if coverURL == "" {
+				coverURL = album.Cover
+			}
+
+			albums = append(albums, ArtistAlbumMetadata{
+				ID:          fmt.Sprintf("deezer:%d", album.ID),
+				Name:        album.Title,
+				ReleaseDate: album.ReleaseDate,
+				TotalTracks: album.NbTracks,
+				Images:      coverURL,
+				AlbumType:   albumType,
+				Artists:     artist.Name,
+			})
+		}
+	}
+
+	result := &ArtistResponsePayload{
+		ArtistInfo: artistInfo,
+		Albums:     albums,
+	}
+
+	c.cacheMu.Lock()
+	c.artistCache[artistID] = &cacheEntry{
+		data:      result,
+		expiresAt: time.Now().Add(deezerCacheTTL),
+	}
+	c.cacheMu.Unlock()
+
+	return result, nil
+}
+
+// GetPlaylist fetches playlist with tracks
+func (c *DeezerClient) GetPlaylist(ctx context.Context, playlistID string) (*PlaylistResponsePayload, error) {
+	playlistURL := fmt.Sprintf(deezerPlaylistURL, playlistID)
+	
+	var playlist deezerPlaylistFull
+	if err := c.getJSON(ctx, playlistURL, &playlist); err != nil {
+		return nil, err
+	}
+
+	playlistImage := playlist.PictureXL
+	if playlistImage == "" {
+		playlistImage = playlist.PictureBig
+	}
+	if playlistImage == "" {
+		playlistImage = playlist.PictureMedium
+	}
+
+	var info PlaylistInfoMetadata
+	info.Tracks.Total = playlist.NbTracks
+	info.Owner.DisplayName = playlist.Creator.Name
+	info.Owner.Name = playlist.Title
+	info.Owner.Images = playlistImage
+
+	tracks := make([]AlbumTrackMetadata, 0, len(playlist.Tracks.Data))
+	for _, track := range playlist.Tracks.Data {
+		albumImage := track.Album.CoverXL
+		if albumImage == "" {
+			albumImage = track.Album.CoverBig
+		}
+		if albumImage == "" {
+			albumImage = track.Album.CoverMedium
+		}
+
+		// Fetch full track for ISRC
+		fullTrack, _ := c.fetchFullTrack(ctx, fmt.Sprintf("%d", track.ID))
+		isrc := ""
+		releaseDate := ""
+		if fullTrack != nil {
+			isrc = fullTrack.ISRC
+		}
+
+		tracks = append(tracks, AlbumTrackMetadata{
+			SpotifyID:   fmt.Sprintf("deezer:%d", track.ID),
+			Artists:     track.Artist.Name,
+			Name:        track.Title,
+			AlbumName:   track.Album.Title,
+			AlbumArtist: track.Artist.Name,
+			DurationMS:  track.Duration * 1000,
+			Images:      albumImage,
+			ReleaseDate: releaseDate,
+			TrackNumber: track.TrackPosition,
+			DiscNumber:  track.DiskNumber,
+			ExternalURL: track.Link,
+			ISRC:        isrc,
+			AlbumID:     fmt.Sprintf("deezer:%d", track.Album.ID),
+		})
+	}
+
+	return &PlaylistResponsePayload{
+		PlaylistInfo: info,
+		TrackList:    tracks,
+	}, nil
+}
+
+// SearchByISRC searches for a track by ISRC using direct endpoint
+func (c *DeezerClient) SearchByISRC(ctx context.Context, isrc string) (*TrackMetadata, error) {
+	// Use direct ISRC endpoint (API 2.0)
+	// https://api.deezer.com/2.0/track/isrc:{ISRC}
+	directURL := fmt.Sprintf("%s/track/isrc:%s", deezerBaseURL, isrc)
+	
+	var track deezerTrack
+	if err := c.getJSON(ctx, directURL, &track); err != nil {
+		// Fallback to search if direct endpoint fails
+		searchURL := fmt.Sprintf("%s/track?q=isrc:%s&limit=1", deezerSearchURL, isrc)
+		var resp struct {
+			Data []deezerTrack `json:"data"`
+		}
+		if err := c.getJSON(ctx, searchURL, &resp); err != nil {
+			return nil, err
+		}
+		if len(resp.Data) == 0 {
+			return nil, fmt.Errorf("no track found for ISRC: %s", isrc)
+		}
+		result := c.convertTrack(resp.Data[0])
+		return &result, nil
+	}
+
+	// Check if we got a valid response (ID > 0)
+	if track.ID == 0 {
+		return nil, fmt.Errorf("no track found for ISRC: %s", isrc)
+	}
+
+	result := c.convertTrack(track)
+	return &result, nil
+}
+
+func (c *DeezerClient) fetchFullTrack(ctx context.Context, trackID string) (*deezerTrack, error) {
+	trackURL := fmt.Sprintf(deezerTrackURL, trackID)
+	var track deezerTrack
+	if err := c.getJSON(ctx, trackURL, &track); err != nil {
+		return nil, err
+	}
+	return &track, nil
+}
+
+func (c *DeezerClient) convertTrack(track deezerTrack) TrackMetadata {
+	artistName := track.Artist.Name
+	if len(track.Contributors) > 0 {
+		names := make([]string, len(track.Contributors))
+		for i, a := range track.Contributors {
+			names[i] = a.Name
+		}
+		artistName = strings.Join(names, ", ")
+	}
+
+	albumImage := track.Album.CoverXL
+	if albumImage == "" {
+		albumImage = track.Album.CoverBig
+	}
+	if albumImage == "" {
+		albumImage = track.Album.CoverMedium
+	}
+	if albumImage == "" {
+		albumImage = track.Album.Cover
+	}
+
+	return TrackMetadata{
+		SpotifyID:   fmt.Sprintf("deezer:%d", track.ID),
+		Artists:     artistName,
+		Name:        track.Title,
+		AlbumName:   track.Album.Title,
+		AlbumArtist: track.Artist.Name,
+		DurationMS:  track.Duration * 1000,
+		Images:      albumImage,
+		TrackNumber: track.TrackPosition,
+		DiscNumber:  track.DiskNumber,
+		ExternalURL: track.Link,
+		ISRC:        track.ISRC,
+	}
+}
+
+func (c *DeezerClient) getBestArtistImage(artist deezerArtist) string {
+	if artist.PictureXL != "" {
+		return artist.PictureXL
+	}
+	if artist.PictureBig != "" {
+		return artist.PictureBig
+	}
+	if artist.PictureMedium != "" {
+		return artist.PictureMedium
+	}
+	return artist.Picture
+}
+
+func (c *DeezerClient) getBestArtistImageFull(artist deezerArtistFull) string {
+	if artist.PictureXL != "" {
+		return artist.PictureXL
+	}
+	if artist.PictureBig != "" {
+		return artist.PictureBig
+	}
+	if artist.PictureMedium != "" {
+		return artist.PictureMedium
+	}
+	return artist.Picture
+}
+
+func (c *DeezerClient) getBestAlbumImage(album deezerAlbumFull) string {
+	if album.CoverXL != "" {
+		return album.CoverXL
+	}
+	if album.CoverBig != "" {
+		return album.CoverBig
+	}
+	if album.CoverMedium != "" {
+		return album.CoverMedium
+	}
+	return album.Cover
+}
+
+func (c *DeezerClient) getJSON(ctx context.Context, endpoint string, dst interface{}) error {
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, endpoint, nil)
+	if err != nil {
+		return err
+	}
+
+	req.Header.Set("Accept", "application/json")
+
+	resp, err := c.httpClient.Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return err
+	}
+
+	if resp.StatusCode != http.StatusOK {
+		return fmt.Errorf("deezer API returned status %d: %s", resp.StatusCode, string(body))
+	}
+
+	return json.Unmarshal(body, dst)
+}
+
+// parseDeezerURL is internal function, returns type and ID
+func parseDeezerURL(input string) (string, string, error) {
+	trimmed := strings.TrimSpace(input)
+	if trimmed == "" {
+		return "", "", fmt.Errorf("empty URL")
+	}
+
+	parsed, err := url.Parse(trimmed)
+	if err != nil {
+		return "", "", err
+	}
+
+	if parsed.Host != "www.deezer.com" && parsed.Host != "deezer.com" && parsed.Host != "deezer.page.link" {
+		return "", "", fmt.Errorf("not a Deezer URL")
+	}
+
+	parts := strings.Split(strings.Trim(parsed.Path, "/"), "/")
+	
+	// Skip language prefix if present (e.g., /en/, /fr/)
+	if len(parts) > 0 && len(parts[0]) == 2 {
+		parts = parts[1:]
+	}
+
+	if len(parts) < 2 {
+		return "", "", fmt.Errorf("invalid Deezer URL format")
+	}
+
+	resourceType := parts[0]
+	resourceID := parts[1]
+
+	switch resourceType {
+	case "track", "album", "artist", "playlist":
+		return resourceType, resourceID, nil
+	default:
+		return "", "", fmt.Errorf("unsupported Deezer resource type: %s", resourceType)
+	}
+}

go_backend/exports.go

@@ -276,12 +276,14 @@ func DownloadWithFallback(requestJSON string) (string, error) {
 	req.OutputDir = strings.TrimSpace(req.OutputDir)
 	
 	// Build service order starting with preferred service
-	allServices := []string{"tidal", "qobuz", "amazon"}
+	allServices := []string{"qobuz", "tidal", "amazon"}
 	preferredService := req.Service
 	if preferredService == "" {
-		preferredService = "tidal"
+		preferredService = "qobuz"
 	}
 	
+	fmt.Printf("[DownloadWithFallback] Preferred service from request: '%s'\n", req.Service)
+	
 	// Create ordered list: preferred first, then others
 	services := []string{preferredService}
 	for _, s := range allServices {
@@ -290,9 +292,12 @@ func DownloadWithFallback(requestJSON string) (string, error) {
 		}
 	}
 	
+	fmt.Printf("[DownloadWithFallback] Service order: %v\n", services)
+	
 	var lastErr error
 	
 	for _, service := range services {
+		fmt.Printf("[DownloadWithFallback] Trying service: %s\n", service)
 		req.Service = service
 		
 		var result DownloadResult
@@ -516,6 +521,253 @@ func EmbedLyricsToFile(filePath, lyrics string) (string, error) {
 	return string(jsonBytes), nil
 }
 
+// PreWarmTrackCacheJSON pre-warms the track ID cache for album/playlist tracks
+// tracksJSON is a JSON array of objects with: isrc, track_name, artist_name, spotify_id, service
+// This runs in background and returns immediately
+func PreWarmTrackCacheJSON(tracksJSON string) (string, error) {
+	var tracks []struct {
+		ISRC       string `json:"isrc"`
+		TrackName  string `json:"track_name"`
+		ArtistName string `json:"artist_name"`
+		SpotifyID  string `json:"spotify_id"`
+		Service    string `json:"service"`
+	}
+
+	if err := json.Unmarshal([]byte(tracksJSON), &tracks); err != nil {
+		return errorResponse("Invalid JSON: " + err.Error())
+	}
+
+	// Convert to PreWarmCacheRequest
+	requests := make([]PreWarmCacheRequest, len(tracks))
+	for i, t := range tracks {
+		requests[i] = PreWarmCacheRequest{
+			ISRC:       t.ISRC,
+			TrackName:  t.TrackName,
+			ArtistName: t.ArtistName,
+			SpotifyID:  t.SpotifyID,
+			Service:    t.Service,
+		}
+	}
+
+	// Run in background
+	go PreWarmTrackCache(requests)
+
+	resp := map[string]interface{}{
+		"success": true,
+		"message": fmt.Sprintf("Pre-warming cache for %d tracks in background", len(tracks)),
+	}
+
+	jsonBytes, _ := json.Marshal(resp)
+	return string(jsonBytes), nil
+}
+
+// GetTrackCacheSize returns the current track ID cache size
+func GetTrackCacheSize() int {
+	return GetCacheSize()
+}
+
+// ClearTrackIDCache clears the track ID cache
+func ClearTrackIDCache() {
+	ClearTrackCache()
+}
+
+// ==================== DEEZER API ====================
+
+// SearchDeezerAll searches for tracks and artists on Deezer (no API key required)
+// Returns JSON with tracks and artists arrays
+func SearchDeezerAll(query string, trackLimit, artistLimit int) (string, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
+	defer cancel()
+	
+	client := GetDeezerClient()
+	results, err := client.SearchAll(ctx, query, trackLimit, artistLimit)
+	if err != nil {
+		return "", err
+	}
+	
+	jsonBytes, err := json.Marshal(results)
+	if err != nil {
+		return "", err
+	}
+	
+	return string(jsonBytes), nil
+}
+
+// GetDeezerMetadata fetches metadata from Deezer URL or ID
+// resourceType: track, album, artist, playlist
+// resourceID: Deezer ID
+func GetDeezerMetadata(resourceType, resourceID string) (string, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+	
+	client := GetDeezerClient()
+	var data interface{}
+	var err error
+	
+	switch resourceType {
+	case "track":
+		data, err = client.GetTrack(ctx, resourceID)
+	case "album":
+		data, err = client.GetAlbum(ctx, resourceID)
+	case "artist":
+		data, err = client.GetArtist(ctx, resourceID)
+	case "playlist":
+		data, err = client.GetPlaylist(ctx, resourceID)
+	default:
+		return "", fmt.Errorf("unsupported Deezer resource type: %s", resourceType)
+	}
+	
+	if err != nil {
+		return "", err
+	}
+	
+	jsonBytes, err := json.Marshal(data)
+	if err != nil {
+		return "", err
+	}
+	
+	return string(jsonBytes), nil
+}
+
+// ParseDeezerURLExport parses a Deezer URL and returns type and ID
+func ParseDeezerURLExport(url string) (string, error) {
+	resourceType, resourceID, err := parseDeezerURL(url)
+	if err != nil {
+		return "", err
+	}
+	
+	result := map[string]string{
+		"type": resourceType,
+		"id":   resourceID,
+	}
+	
+	jsonBytes, err := json.Marshal(result)
+	if err != nil {
+		return "", err
+	}
+	
+	return string(jsonBytes), nil
+}
+
+// SearchDeezerByISRC searches for a track by ISRC on Deezer
+func SearchDeezerByISRC(isrc string) (string, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+	
+	client := GetDeezerClient()
+	track, err := client.SearchByISRC(ctx, isrc)
+	if err != nil {
+		return "", err
+	}
+	
+	jsonBytes, err := json.Marshal(track)
+	if err != nil {
+		return "", err
+	}
+	
+	return string(jsonBytes), nil
+}
+
+// ConvertSpotifyToDeezer converts a Spotify track/album ID to Deezer and fetches metadata
+// This uses SongLink API to find the Deezer equivalent, then fetches from Deezer
+// Useful when Spotify API is rate limited
+func ConvertSpotifyToDeezer(resourceType, spotifyID string) (string, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+	
+	songlink := NewSongLinkClient()
+	deezerClient := GetDeezerClient()
+	
+	// For tracks, we can use SongLink to get Deezer ID
+	if resourceType == "track" {
+		deezerID, err := songlink.GetDeezerIDFromSpotify(spotifyID)
+		if err != nil {
+			return "", fmt.Errorf("could not find Deezer equivalent: %w", err)
+		}
+		
+		// Fetch metadata from Deezer
+		trackResp, err := deezerClient.GetTrack(ctx, deezerID)
+		if err != nil {
+			return "", fmt.Errorf("failed to fetch Deezer metadata: %w", err)
+		}
+		
+		jsonBytes, err := json.Marshal(trackResp)
+		if err != nil {
+			return "", err
+		}
+		
+		return string(jsonBytes), nil
+	}
+	
+	// For albums, SongLink also provides mapping
+	if resourceType == "album" {
+		deezerID, err := songlink.GetDeezerAlbumIDFromSpotify(spotifyID)
+		if err != nil {
+			return "", fmt.Errorf("could not find Deezer album: %w", err)
+		}
+		
+		// Fetch album metadata from Deezer
+		albumResp, err := deezerClient.GetAlbum(ctx, deezerID)
+		if err != nil {
+			return "", fmt.Errorf("failed to fetch Deezer album metadata: %w", err)
+		}
+		
+		jsonBytes, err := json.Marshal(albumResp)
+		if err != nil {
+			return "", err
+		}
+		
+		return string(jsonBytes), nil
+	}
+	
+	// For artists/playlists, SongLink doesn't provide direct mapping
+	return "", fmt.Errorf("Spotify to Deezer conversion only supported for tracks and albums. Please search by name for %s", resourceType)
+}
+
+// GetSpotifyMetadataWithDeezerFallback tries Spotify first, falls back to Deezer on rate limit
+func GetSpotifyMetadataWithDeezerFallback(spotifyURL string) (string, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+	
+	// Try Spotify first
+	client := NewSpotifyMetadataClient()
+	data, err := client.GetFilteredData(ctx, spotifyURL, false, 0)
+	if err == nil {
+		jsonBytes, err := json.Marshal(data)
+		if err != nil {
+			return "", err
+		}
+		return string(jsonBytes), nil
+	}
+	
+	// Check if it's a rate limit error
+	errStr := strings.ToLower(err.Error())
+	if !strings.Contains(errStr, "429") && !strings.Contains(errStr, "rate") && !strings.Contains(errStr, "limit") {
+		// Not a rate limit error, return original error
+		return "", err
+	}
+	
+	// Rate limited - try Deezer fallback for tracks and albums
+	parsed, parseErr := parseSpotifyURI(spotifyURL)
+	if parseErr != nil {
+		return "", fmt.Errorf("spotify rate limited and failed to parse URL: %w", parseErr)
+	}
+	
+	fmt.Printf("[Fallback] Spotify rate limited for %s, trying Deezer...\n", parsed.Type)
+	
+	if parsed.Type == "track" || parsed.Type == "album" {
+		// Convert to Deezer
+		return ConvertSpotifyToDeezer(parsed.Type, parsed.ID)
+	}
+	
+	// Artist and playlist not supported for fallback
+	if parsed.Type == "artist" {
+		return "", fmt.Errorf("spotify rate limited. Artist pages require Spotify API - please try again later")
+	}
+	
+	return "", fmt.Errorf("spotify rate limited. Playlists are user-specific and require Spotify API")
+}
+
 func errorResponse(msg string) (string, error) {
 	resp := DownloadResponse{
 		Success: false,

go_backend/httputil.go

@@ -43,6 +43,7 @@ const (
 )
 
 // Shared transport with connection pooling to prevent TCP exhaustion
+// Optimized for large file downloads (FLAC ~30-50MB)
 var sharedTransport = &http.Transport{
 	DialContext: (&net.Dialer{
 		Timeout:   30 * time.Second,
@@ -56,6 +57,9 @@ var sharedTransport = &http.Transport{
 	ExpectContinueTimeout: 1 * time.Second,
 	DisableKeepAlives:     false, // Enable keep-alives for connection reuse
 	ForceAttemptHTTP2:     true,
+	WriteBufferSize:       64 * 1024,  // 64KB write buffer
+	ReadBufferSize:        64 * 1024,  // 64KB read buffer
+	DisableCompression:    true,       // FLAC is already compressed
 }
 
 // Shared HTTP client for general requests (reuses connections)

go_backend/parallel.go

@@ -0,0 +1,288 @@
+package gobackend
+
+import (
+	"fmt"
+	"sync"
+	"time"
+)
+
+// ========================================
+// ISRC to Track ID Cache
+// ========================================
+
+// TrackIDCacheEntry holds cached track ID with metadata
+type TrackIDCacheEntry struct {
+	TidalTrackID  int64
+	QobuzTrackID  int64
+	AmazonTrackID string
+	ExpiresAt     time.Time
+}
+
+// TrackIDCache caches ISRC to track ID mappings
+type TrackIDCache struct {
+	cache map[string]*TrackIDCacheEntry
+	mu    sync.RWMutex
+	ttl   time.Duration
+}
+
+var (
+	globalTrackIDCache *TrackIDCache
+	trackIDCacheOnce   sync.Once
+)
+
+// GetTrackIDCache returns the global track ID cache
+func GetTrackIDCache() *TrackIDCache {
+	trackIDCacheOnce.Do(func() {
+		globalTrackIDCache = &TrackIDCache{
+			cache: make(map[string]*TrackIDCacheEntry),
+			ttl:   30 * time.Minute, // Cache for 30 minutes
+		}
+	})
+	return globalTrackIDCache
+}
+
+// Get retrieves a cached entry by ISRC
+func (c *TrackIDCache) Get(isrc string) *TrackIDCacheEntry {
+	c.mu.RLock()
+	defer c.mu.RUnlock()
+
+	entry, exists := c.cache[isrc]
+	if !exists || time.Now().After(entry.ExpiresAt) {
+		return nil
+	}
+	return entry
+}
+
+// SetTidal caches Tidal track ID for an ISRC
+func (c *TrackIDCache) SetTidal(isrc string, trackID int64) {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+
+	entry, exists := c.cache[isrc]
+	if !exists {
+		entry = &TrackIDCacheEntry{}
+		c.cache[isrc] = entry
+	}
+	entry.TidalTrackID = trackID
+	entry.ExpiresAt = time.Now().Add(c.ttl)
+}
+
+// SetQobuz caches Qobuz track ID for an ISRC
+func (c *TrackIDCache) SetQobuz(isrc string, trackID int64) {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+
+	entry, exists := c.cache[isrc]
+	if !exists {
+		entry = &TrackIDCacheEntry{}
+		c.cache[isrc] = entry
+	}
+	entry.QobuzTrackID = trackID
+	entry.ExpiresAt = time.Now().Add(c.ttl)
+}
+
+// SetAmazon caches Amazon track ID for an ISRC
+func (c *TrackIDCache) SetAmazon(isrc string, trackID string) {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+
+	entry, exists := c.cache[isrc]
+	if !exists {
+		entry = &TrackIDCacheEntry{}
+		c.cache[isrc] = entry
+	}
+	entry.AmazonTrackID = trackID
+	entry.ExpiresAt = time.Now().Add(c.ttl)
+}
+
+// Clear removes all cached entries
+func (c *TrackIDCache) Clear() {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	c.cache = make(map[string]*TrackIDCacheEntry)
+}
+
+// Size returns the number of cached entries
+func (c *TrackIDCache) Size() int {
+	c.mu.RLock()
+	defer c.mu.RUnlock()
+	return len(c.cache)
+}
+
+// ========================================
+// Parallel Download Helper
+// ========================================
+
+// ParallelDownloadResult holds results from parallel operations
+type ParallelDownloadResult struct {
+	CoverData  []byte
+	LyricsData *LyricsResponse
+	LyricsLRC  string
+	CoverErr   error
+	LyricsErr  error
+}
+
+// FetchCoverAndLyricsParallel downloads cover and fetches lyrics in parallel
+// This runs while the main audio download is happening
+func FetchCoverAndLyricsParallel(
+	coverURL string,
+	maxQualityCover bool,
+	spotifyID string,
+	trackName string,
+	artistName string,
+	embedLyrics bool,
+) *ParallelDownloadResult {
+	result := &ParallelDownloadResult{}
+	var wg sync.WaitGroup
+
+	// Download cover in parallel
+	if coverURL != "" {
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			fmt.Println("[Parallel] Starting cover download...")
+			data, err := downloadCoverToMemory(coverURL, maxQualityCover)
+			if err != nil {
+				result.CoverErr = err
+				fmt.Printf("[Parallel] Cover download failed: %v\n", err)
+			} else {
+				result.CoverData = data
+				fmt.Printf("[Parallel] Cover downloaded: %d bytes\n", len(data))
+			}
+		}()
+	}
+
+	// Fetch lyrics in parallel
+	if embedLyrics {
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			fmt.Println("[Parallel] Starting lyrics fetch...")
+			client := NewLyricsClient()
+			lyrics, err := client.FetchLyricsAllSources(spotifyID, trackName, artistName)
+			if err != nil {
+				result.LyricsErr = err
+				fmt.Printf("[Parallel] Lyrics fetch failed: %v\n", err)
+			} else if lyrics != nil && len(lyrics.Lines) > 0 {
+				result.LyricsData = lyrics
+				result.LyricsLRC = convertToLRC(lyrics)
+				fmt.Printf("[Parallel] Lyrics fetched: %d lines\n", len(lyrics.Lines))
+			} else {
+				result.LyricsErr = fmt.Errorf("no lyrics found")
+				fmt.Println("[Parallel] No lyrics found")
+			}
+		}()
+	}
+
+	wg.Wait()
+	return result
+}
+
+// ========================================
+// Pre-warm Cache for Album/Playlist
+// ========================================
+
+// PreWarmCacheRequest represents a track to pre-warm cache for
+type PreWarmCacheRequest struct {
+	ISRC       string
+	TrackName  string
+	ArtistName string
+	SpotifyID  string // Needed for Amazon (SongLink lookup)
+	Service    string // "tidal", "qobuz", "amazon"
+}
+
+// PreWarmTrackCache pre-fetches track IDs for multiple tracks (for album/playlist)
+// This runs in background while user is viewing the track list
+func PreWarmTrackCache(requests []PreWarmCacheRequest) {
+	if len(requests) == 0 {
+		return
+	}
+
+	fmt.Printf("[Cache] Pre-warming cache for %d tracks...\n", len(requests))
+	cache := GetTrackIDCache()
+
+	// Limit concurrent pre-warm requests
+	semaphore := make(chan struct{}, 3) // Max 3 concurrent
+	var wg sync.WaitGroup
+
+	for _, req := range requests {
+		// Skip if already cached
+		if cached := cache.Get(req.ISRC); cached != nil {
+			continue
+		}
+
+		wg.Add(1)
+		go func(r PreWarmCacheRequest) {
+			defer wg.Done()
+			semaphore <- struct{}{}        // Acquire
+			defer func() { <-semaphore }() // Release
+
+			switch r.Service {
+			case "tidal":
+				preWarmTidalCache(r.ISRC, r.TrackName, r.ArtistName)
+			case "qobuz":
+				preWarmQobuzCache(r.ISRC)
+			case "amazon":
+				preWarmAmazonCache(r.ISRC, r.SpotifyID)
+			}
+		}(req)
+	}
+
+	wg.Wait()
+	fmt.Printf("[Cache] Pre-warm complete. Cache size: %d\n", cache.Size())
+}
+
+func preWarmTidalCache(isrc, trackName, artistName string) {
+	downloader := NewTidalDownloader()
+	track, err := downloader.SearchTrackByISRC(isrc)
+	if err == nil && track != nil {
+		GetTrackIDCache().SetTidal(isrc, track.ID)
+		fmt.Printf("[Cache] Cached Tidal ID for ISRC %s: %d\n", isrc, track.ID)
+	}
+}
+
+func preWarmQobuzCache(isrc string) {
+	downloader := NewQobuzDownloader()
+	track, err := downloader.SearchTrackByISRC(isrc)
+	if err == nil && track != nil {
+		GetTrackIDCache().SetQobuz(isrc, track.ID)
+		fmt.Printf("[Cache] Cached Qobuz ID for ISRC %s: %d\n", isrc, track.ID)
+	}
+}
+
+func preWarmAmazonCache(isrc, spotifyID string) {
+	// Amazon uses SongLink to get URL, so we pre-warm by checking availability
+	client := NewSongLinkClient()
+	availability, err := client.CheckTrackAvailability(spotifyID, isrc)
+	if err == nil && availability != nil && availability.Amazon {
+		// Store Amazon URL in cache (using ISRC as key)
+		GetTrackIDCache().SetAmazon(isrc, availability.AmazonURL)
+		fmt.Printf("[Cache] Cached Amazon URL for ISRC %s\n", isrc)
+	}
+}
+
+// ========================================
+// Exported Functions for Flutter
+// ========================================
+
+// PreWarmCache is called from Flutter to pre-warm cache for album/playlist tracks
+// tracksJSON is a JSON array of {isrc, track_name, artist_name, service}
+func PreWarmCache(tracksJSON string) error {
+	var requests []PreWarmCacheRequest
+	// Parse JSON (simplified - in production use proper JSON parsing)
+	// For now, this is called from exports.go with proper parsing
+	
+	go PreWarmTrackCache(requests) // Run in background
+	return nil
+}
+
+// ClearTrackCache clears the track ID cache
+func ClearTrackCache() {
+	GetTrackIDCache().Clear()
+	fmt.Println("[Cache] Track ID cache cleared")
+}
+
+// GetCacheSize returns the current cache size
+func GetCacheSize() int {
+	return GetTrackIDCache().Size()
+}

go_backend/progress.go

@@ -196,27 +196,37 @@ func getDownloadDir() string {
 
 // ItemProgressWriter wraps io.Writer to track download progress for a specific item
 type ItemProgressWriter struct {
-	writer  interface{ Write([]byte) (int, error) }
+	writer       interface{ Write([]byte) (int, error) }
-	itemID  string
+	itemID       string
-	current int64
+	current      int64
+	lastReported int64 // Track last reported bytes for threshold-based updates
 }
 
+const progressUpdateThreshold = 64 * 1024 // Update progress every 64KB
+
 // NewItemProgressWriter creates a new progress writer for a specific item
 func NewItemProgressWriter(w interface{ Write([]byte) (int, error) }, itemID string) *ItemProgressWriter {
 	return &ItemProgressWriter{
-		writer:  w,
+		writer:       w,
-		itemID:  itemID,
+		itemID:       itemID,
-		current: 0,
+		current:      0,
+		lastReported: 0,
 	}
 }
 
-// Write implements io.Writer
+// Write implements io.Writer with threshold-based progress updates
 func (pw *ItemProgressWriter) Write(p []byte) (int, error) {
 	n, err := pw.writer.Write(p)
 	if err != nil {
 		return n, err
 	}
 	pw.current += int64(n)
-	SetItemBytesReceived(pw.itemID, pw.current)
+
+	// Update progress when we've received at least 64KB since last update
+	// Also update on first write to show download has started
+	if pw.lastReported == 0 || pw.current-pw.lastReported >= progressUpdateThreshold {
+		SetItemBytesReceived(pw.itemID, pw.current)
+		pw.lastReported = pw.current
+	}
 	return n, nil
 }

go_backend/qobuz.go

@@ -1,6 +1,7 @@
 package gobackend
 
 import (
+	"bufio"
 	"encoding/base64"
 	"encoding/json"
 	"fmt"
@@ -10,6 +11,7 @@ import (
 	"os"
 	"path/filepath"
 	"strings"
+	"sync"
 )
 
 // QobuzDownloader handles Qobuz downloads
@@ -19,6 +21,12 @@ type QobuzDownloader struct {
 	apiURL string
 }
 
+var (
+	// Global Qobuz downloader instance for connection reuse
+	globalQobuzDownloader *QobuzDownloader
+	qobuzDownloaderOnce   sync.Once
+)
+
 // QobuzTrack represents a Qobuz track
 type QobuzTrack struct {
 	ID                  int64   `json:"id"`
@@ -97,12 +105,15 @@ func qobuzIsASCIIString(s string) bool {
 	return true
 }
 
-// NewQobuzDownloader creates a new Qobuz downloader
+// NewQobuzDownloader creates a new Qobuz downloader (returns singleton for connection reuse)
 func NewQobuzDownloader() *QobuzDownloader {
-	return &QobuzDownloader{
+	qobuzDownloaderOnce.Do(func() {
-		client: NewHTTPClientWithTimeout(DefaultTimeout), // 60s timeout
+		globalQobuzDownloader = &QobuzDownloader{
-		appID:  "798273057",
+			client: NewHTTPClientWithTimeout(DefaultTimeout), // 60s timeout
-	}
+			appID:  "798273057",
+		}
+	})
+	return globalQobuzDownloader
 }
 
 // GetAvailableAPIs returns list of available Qobuz APIs
@@ -462,26 +473,55 @@ func (q *QobuzDownloader) DownloadFile(downloadURL, outputPath, itemID string) e
 		return fmt.Errorf("download failed: HTTP %d", resp.StatusCode)
 	}
 
+	expectedSize := resp.ContentLength
 	// Set total bytes if available
-	if resp.ContentLength > 0 && itemID != "" {
+	if expectedSize > 0 && itemID != "" {
-		SetItemBytesTotal(itemID, resp.ContentLength)
+		SetItemBytesTotal(itemID, expectedSize)
 	}
 
 	out, err := os.Create(outputPath)
 	if err != nil {
 		return err
 	}
-	defer out.Close()
 
-	// Use item progress writer
+	// Use buffered writer for better performance (256KB buffer)
+	bufWriter := bufio.NewWriterSize(out, 256*1024)
+
+	// Use item progress writer with buffered output
+	var written int64
 	if itemID != "" {
-		progressWriter := NewItemProgressWriter(out, itemID)
+		progressWriter := NewItemProgressWriter(bufWriter, itemID)
-		_, err = io.Copy(progressWriter, resp.Body)
+		written, err = io.Copy(progressWriter, resp.Body)
 	} else {
 		// Fallback: direct copy without progress tracking
-		_, err = io.Copy(out, resp.Body)
+		written, err = io.Copy(bufWriter, resp.Body)
 	}
-	return err
+
+	// Flush buffer before checking for errors
+	flushErr := bufWriter.Flush()
+	closeErr := out.Close()
+
+	// Check for any errors
+	if err != nil {
+		os.Remove(outputPath)
+		return fmt.Errorf("download interrupted: %w", err)
+	}
+	if flushErr != nil {
+		os.Remove(outputPath)
+		return fmt.Errorf("failed to flush buffer: %w", flushErr)
+	}
+	if closeErr != nil {
+		os.Remove(outputPath)
+		return fmt.Errorf("failed to close file: %w", closeErr)
+	}
+
+	// Verify file size if Content-Length was provided
+	if expectedSize > 0 && written != expectedSize {
+		os.Remove(outputPath)
+		return fmt.Errorf("incomplete download: expected %d bytes, got %d bytes", expectedSize, written)
+	}
+
+	return nil
 }
 
 // QobuzDownloadResult contains download result with quality info
@@ -506,8 +546,21 @@ func downloadFromQobuz(req DownloadRequest) (QobuzDownloadResult, error) {
 	var track *QobuzTrack
 	var err error
 
-	// Strategy 1: Search by ISRC with duration verification
+	// OPTIMIZATION: Check cache first for track ID
 	if req.ISRC != "" {
+		if cached := GetTrackIDCache().Get(req.ISRC); cached != nil && cached.QobuzTrackID > 0 {
+			fmt.Printf("[Qobuz] Cache hit! Using cached track ID: %d\n", cached.QobuzTrackID)
+			// For Qobuz we need to search again to get full track info, but we can use the ID
+			track, err = downloader.SearchTrackByISRC(req.ISRC)
+			if err != nil {
+				fmt.Printf("[Qobuz] Cache hit but search failed: %v\n", err)
+				track = nil
+			}
+		}
+	}
+
+	// Strategy 1: Search by ISRC with duration verification
+	if track == nil && req.ISRC != "" {
 		track, err = downloader.SearchTrackByISRCWithDuration(req.ISRC, expectedDurationSec)
 		// Verify artist
 		if track != nil && !qobuzArtistsMatch(req.ArtistName, track.Performer.Name) {
@@ -536,8 +589,11 @@ func downloadFromQobuz(req DownloadRequest) (QobuzDownloadResult, error) {
 		return QobuzDownloadResult{}, fmt.Errorf("qobuz search failed: %s", errMsg)
 	}
 
-	// Log match found
+	// Log match found and cache the track ID
 	fmt.Printf("[Qobuz] Match found: '%s' by '%s' (duration: %ds)\n", track.Title, track.Performer.Name, track.Duration)
+	if req.ISRC != "" {
+		GetTrackIDCache().SetQobuz(req.ISRC, track.ID)
+	}
 
 	// Build filename
 	filename := buildFilenameFromTemplate(req.FilenameFormat, map[string]interface{}{
@@ -581,11 +637,29 @@ func downloadFromQobuz(req DownloadRequest) (QobuzDownloadResult, error) {
 		return QobuzDownloadResult{}, fmt.Errorf("failed to get download URL: %w", err)
 	}
 
-	// Download file with item ID for progress tracking
+	// START PARALLEL: Fetch cover and lyrics while downloading audio
+	var parallelResult *ParallelDownloadResult
+	parallelDone := make(chan struct{})
+	go func() {
+		defer close(parallelDone)
+		parallelResult = FetchCoverAndLyricsParallel(
+			req.CoverURL,
+			req.EmbedMaxQualityCover,
+			req.SpotifyID,
+			req.TrackName,
+			req.ArtistName,
+			req.EmbedLyrics,
+		)
+	}()
+
+	// Download audio file with item ID for progress tracking
 	if err := downloader.DownloadFile(downloadURL, outputPath, req.ItemID); err != nil {
 		return QobuzDownloadResult{}, fmt.Errorf("download failed: %w", err)
 	}
 
+	// Wait for parallel operations to complete
+	<-parallelDone
+
 	// Set progress to 100% and status to finalizing (before embedding)
 	// This makes the UI show "Finalizing..." while embedding happens
 	if req.ItemID != "" {
@@ -593,7 +667,7 @@ func downloadFromQobuz(req DownloadRequest) (QobuzDownloadResult, error) {
 		SetItemFinalizing(req.ItemID)
 	}
 
-	// Embed metadata
+	// Embed metadata using parallel-fetched cover data
 	metadata := Metadata{
 		Title:       req.TrackName,
 		Artist:      req.ArtistName,
@@ -606,41 +680,27 @@ func downloadFromQobuz(req DownloadRequest) (QobuzDownloadResult, error) {
 		ISRC:        req.ISRC,
 	}
 
-	// Download cover to memory (avoids file permission issues on Android)
+	// Use cover data from parallel fetch
 	var coverData []byte
-	if req.CoverURL != "" {
+	if parallelResult != nil && parallelResult.CoverData != nil {
-		fmt.Println("[Qobuz] Downloading cover to memory...")
+		coverData = parallelResult.CoverData
-		data, err := downloadCoverToMemory(req.CoverURL, req.EmbedMaxQualityCover)
+		fmt.Printf("[Qobuz] Using parallel-fetched cover (%d bytes)\n", len(coverData))
-		if err == nil {
-			coverData = data
-			fmt.Printf("[Qobuz] Cover downloaded successfully (%d bytes)\n", len(coverData))
-		} else {
-			fmt.Printf("[Qobuz] Warning: failed to download cover: %v\n", err)
-		}
 	}
 
 	if err := EmbedMetadataWithCoverData(outputPath, metadata, coverData); err != nil {
 		fmt.Printf("Warning: failed to embed metadata: %v\n", err)
 	}
 
-	// Embed lyrics if enabled
+	// Embed lyrics from parallel fetch
-	if req.EmbedLyrics {
+	if req.EmbedLyrics && parallelResult != nil && parallelResult.LyricsLRC != "" {
-		fmt.Println("[Qobuz] Fetching lyrics...")
+		fmt.Printf("[Qobuz] Embedding parallel-fetched lyrics (%d lines)...\n", len(parallelResult.LyricsData.Lines))
-		lyricsClient := NewLyricsClient()
+		if embedErr := EmbedLyrics(outputPath, parallelResult.LyricsLRC); embedErr != nil {
-		lyrics, lyricsErr := lyricsClient.FetchLyricsAllSources(req.SpotifyID, req.TrackName, req.ArtistName)
+			fmt.Printf("[Qobuz] Warning: failed to embed lyrics: %v\n", embedErr)
-		if lyricsErr != nil {
-			fmt.Printf("[Qobuz] Warning: lyrics fetch error: %v\n", lyricsErr)
-		} else if lyrics == nil || len(lyrics.Lines) == 0 {
-			fmt.Println("[Qobuz] No lyrics found for this track")
 		} else {
-			fmt.Printf("[Qobuz] Lyrics found (%d lines), embedding...\n", len(lyrics.Lines))
+			fmt.Println("[Qobuz] Lyrics embedded successfully")
-			lrcContent := convertToLRC(lyrics)
-			if embedErr := EmbedLyrics(outputPath, lrcContent); embedErr != nil {
-				fmt.Printf("[Qobuz] Warning: failed to embed lyrics: %v\n", embedErr)
-			} else {
-				fmt.Println("[Qobuz] Lyrics embedded successfully")
-			}
 		}
+	} else if req.EmbedLyrics {
+		fmt.Println("[Qobuz] No lyrics available from parallel fetch")
 	}
 
 	return QobuzDownloadResult{

go_backend/songlink.go

@@ -6,6 +6,8 @@ import (
 	"fmt"
 	"net/http"
 	"net/url"
+	"strings"
+	"sync"
 	"time"
 )
 
@@ -20,16 +22,28 @@ type TrackAvailability struct {
 	Tidal     bool   `json:"tidal"`
 	Amazon    bool   `json:"amazon"`
 	Qobuz     bool   `json:"qobuz"`
+	Deezer    bool   `json:"deezer"`
 	TidalURL  string `json:"tidal_url,omitempty"`
 	AmazonURL string `json:"amazon_url,omitempty"`
 	QobuzURL  string `json:"qobuz_url,omitempty"`
+	DeezerURL string `json:"deezer_url,omitempty"`
+	DeezerID  string `json:"deezer_id,omitempty"`
 }
 
-// NewSongLinkClient creates a new SongLink client
+var (
+	// Global SongLink client instance for connection reuse
+	globalSongLinkClient *SongLinkClient
+	songLinkClientOnce   sync.Once
+)
+
+// NewSongLinkClient creates a new SongLink client (returns singleton for connection reuse)
 func NewSongLinkClient() *SongLinkClient {
-	return &SongLinkClient{
+	songLinkClientOnce.Do(func() {
-		client: NewHTTPClientWithTimeout(SongLinkTimeout), // 30s timeout
+		globalSongLinkClient = &SongLinkClient{
-	}
+			client: NewHTTPClientWithTimeout(SongLinkTimeout), // 30s timeout
+		}
+	})
+	return globalSongLinkClient
 }
 
 // CheckTrackAvailability checks track availability on streaming platforms
@@ -92,6 +106,14 @@ func (s *SongLinkClient) CheckTrackAvailability(spotifyTrackID string, isrc stri
 		availability.AmazonURL = amazonLink.URL
 	}
 
+	// Check Deezer
+	if deezerLink, ok := songLinkResp.LinksByPlatform["deezer"]; ok && deezerLink.URL != "" {
+		availability.Deezer = true
+		availability.DeezerURL = deezerLink.URL
+		// Extract Deezer ID from URL (e.g., https://www.deezer.com/track/123456)
+		availability.DeezerID = extractDeezerIDFromURL(deezerLink.URL)
+	}
+
 	// Check Qobuz using ISRC
 	if isrc != "" {
 		availability.Qobuz = checkQobuzAvailability(isrc)
@@ -151,3 +173,112 @@ func checkQobuzAvailability(isrc string) bool {
 
 	return searchResp.Tracks.Total > 0
 }
+
+// extractDeezerIDFromURL extracts Deezer track/album/artist ID from URL
+func extractDeezerIDFromURL(deezerURL string) string {
+	// URL format: https://www.deezer.com/track/123456 or https://www.deezer.com/en/track/123456
+	parts := strings.Split(deezerURL, "/")
+	if len(parts) > 0 {
+		// Get the last part which should be the ID
+		lastPart := parts[len(parts)-1]
+		// Remove any query parameters
+		if idx := strings.Index(lastPart, "?"); idx > 0 {
+			lastPart = lastPart[:idx]
+		}
+		return lastPart
+	}
+	return ""
+}
+
+// GetDeezerIDFromSpotify converts a Spotify track ID to Deezer track ID using SongLink
+func (s *SongLinkClient) GetDeezerIDFromSpotify(spotifyTrackID string) (string, error) {
+	availability, err := s.CheckTrackAvailability(spotifyTrackID, "")
+	if err != nil {
+		return "", err
+	}
+	
+	if !availability.Deezer || availability.DeezerID == "" {
+		return "", fmt.Errorf("track not found on Deezer")
+	}
+	
+	return availability.DeezerID, nil
+}
+
+// AlbumAvailability represents album availability on different platforms
+type AlbumAvailability struct {
+	SpotifyID string `json:"spotify_id"`
+	Deezer    bool   `json:"deezer"`
+	DeezerURL string `json:"deezer_url,omitempty"`
+	DeezerID  string `json:"deezer_id,omitempty"`
+}
+
+// CheckAlbumAvailability checks album availability on streaming platforms using SongLink
+func (s *SongLinkClient) CheckAlbumAvailability(spotifyAlbumID string) (*AlbumAvailability, error) {
+	// Use global rate limiter
+	songLinkRateLimiter.WaitForSlot()
+
+	// Build API URL for album
+	spotifyBase, _ := base64.StdEncoding.DecodeString("aHR0cHM6Ly9vcGVuLnNwb3RpZnkuY29tL2FsYnVtLw==")
+	spotifyURL := fmt.Sprintf("%s%s", string(spotifyBase), spotifyAlbumID)
+
+	apiBase, _ := base64.StdEncoding.DecodeString("aHR0cHM6Ly9hcGkuc29uZy5saW5rL3YxLWFscGhhLjEvbGlua3M/dXJsPQ==")
+	apiURL := fmt.Sprintf("%s%s", string(apiBase), url.QueryEscape(spotifyURL))
+
+	req, err := http.NewRequest("GET", apiURL, nil)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create request: %w", err)
+	}
+
+	retryConfig := DefaultRetryConfig()
+	resp, err := DoRequestWithRetry(s.client, req, retryConfig)
+	if err != nil {
+		return nil, fmt.Errorf("failed to check album availability: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != 200 {
+		return nil, fmt.Errorf("API returned status %d", resp.StatusCode)
+	}
+
+	body, err := ReadResponseBody(resp)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read response: %w", err)
+	}
+
+	var songLinkResp struct {
+		LinksByPlatform map[string]struct {
+			URL string `json:"url"`
+		} `json:"linksByPlatform"`
+	}
+
+	if err := json.Unmarshal(body, &songLinkResp); err != nil {
+		return nil, fmt.Errorf("failed to decode response: %w", err)
+	}
+
+	availability := &AlbumAvailability{
+		SpotifyID: spotifyAlbumID,
+	}
+
+	// Check Deezer
+	if deezerLink, ok := songLinkResp.LinksByPlatform["deezer"]; ok && deezerLink.URL != "" {
+		availability.Deezer = true
+		availability.DeezerURL = deezerLink.URL
+		availability.DeezerID = extractDeezerIDFromURL(deezerLink.URL)
+	}
+
+	return availability, nil
+}
+
+// GetDeezerAlbumIDFromSpotify converts a Spotify album ID to Deezer album ID using SongLink
+func (s *SongLinkClient) GetDeezerAlbumIDFromSpotify(spotifyAlbumID string) (string, error) {
+	availability, err := s.CheckAlbumAvailability(spotifyAlbumID)
+	if err != nil {
+		return "", err
+	}
+	
+	if !availability.Deezer || availability.DeezerID == "" {
+		return "", fmt.Errorf("album not found on Deezer")
+	}
+	
+	return availability.DeezerID, nil
+}

go_backend/tidal.go

@@ -1,6 +1,7 @@
 package gobackend
 
 import (
+	"bufio"
 	"encoding/base64"
 	"encoding/json"
 	"encoding/xml"
@@ -12,17 +13,27 @@ import (
 	"path/filepath"
 	"regexp"
 	"strings"
+	"sync"
 	"time"
 )
 
 // TidalDownloader handles Tidal downloads
 type TidalDownloader struct {
-	client       *http.Client
+	client         *http.Client
-	clientID     string
+	clientID       string
-	clientSecret string
+	clientSecret   string
-	apiURL       string
+	apiURL         string
+	cachedToken    string
+	tokenExpiresAt time.Time
+	tokenMu        sync.Mutex
 }
 
+var (
+	// Global Tidal downloader instance for token reuse
+	globalTidalDownloader *TidalDownloader
+	tidalDownloaderOnce   sync.Once
+)
+
 // TidalTrack represents a Tidal track
 type TidalTrack struct {
 	ID           int64  `json:"id"`
@@ -93,24 +104,25 @@ type MPD struct {
 	} `xml:"Period"`
 }
 
-// NewTidalDownloader creates a new Tidal downloader
+// NewTidalDownloader creates a new Tidal downloader (returns singleton for token reuse)
 func NewTidalDownloader() *TidalDownloader {
-	clientID, _ := base64.StdEncoding.DecodeString("NkJEU1JkcEs5aHFFQlRnVQ==")
+	tidalDownloaderOnce.Do(func() {
-	clientSecret, _ := base64.StdEncoding.DecodeString("eGV1UG1ZN25icFo5SUliTEFjUTkzc2hrYTFWTmhlVUFxTjZJY3N6alRHOD0=")
+		clientID, _ := base64.StdEncoding.DecodeString("NkJEU1JkcEs5aHFFQlRnVQ==")
+		clientSecret, _ := base64.StdEncoding.DecodeString("eGV1UG1ZN25icFo5SUliTEFjUTkzc2hrYTFWTmhlVUFxTjZJY3N6alRHOD0=")
 
-	downloader := &TidalDownloader{
+		globalTidalDownloader = &TidalDownloader{
-		client:       NewHTTPClientWithTimeout(DefaultTimeout), // 60s timeout
+			client:       NewHTTPClientWithTimeout(DefaultTimeout), // 60s timeout
-		clientID:     string(clientID),
+			clientID:     string(clientID),
-		clientSecret: string(clientSecret),
+			clientSecret: string(clientSecret),
-	}
+		}
 
-	// Get first available API
+		// Get first available API
-	apis := downloader.GetAvailableAPIs()
+		apis := globalTidalDownloader.GetAvailableAPIs()
-	if len(apis) > 0 {
+		if len(apis) > 0 {
-		downloader.apiURL = apis[0]
+			globalTidalDownloader.apiURL = apis[0]
-	}
+		}
-
+	})
-	return downloader
+	return globalTidalDownloader
 }
 
 // GetAvailableAPIs returns list of available Tidal APIs
@@ -138,8 +150,16 @@ func (t *TidalDownloader) GetAvailableAPIs() []string {
 	return apis
 }
 
-// GetAccessToken gets Tidal access token
+// GetAccessToken gets Tidal access token (with caching)
 func (t *TidalDownloader) GetAccessToken() (string, error) {
+	t.tokenMu.Lock()
+	defer t.tokenMu.Unlock()
+
+	// Return cached token if still valid (with 60s buffer)
+	if t.cachedToken != "" && time.Now().Add(60*time.Second).Before(t.tokenExpiresAt) {
+		return t.cachedToken, nil
+	}
+
 	data := fmt.Sprintf("client_id=%s&grant_type=client_credentials", t.clientID)
 
 	authURL, _ := base64.StdEncoding.DecodeString("aHR0cHM6Ly9hdXRoLnRpZGFsLmNvbS92MS9vYXV0aDIvdG9rZW4=")
@@ -163,12 +183,21 @@ func (t *TidalDownloader) GetAccessToken() (string, error) {
 
 	var result struct {
 		AccessToken string `json:"access_token"`
+		ExpiresIn   int    `json:"expires_in"`
 	}
 
 	if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
 		return "", err
 	}
 
+	// Cache the token
+	t.cachedToken = result.AccessToken
+	if result.ExpiresIn > 0 {
+		t.tokenExpiresAt = time.Now().Add(time.Duration(result.ExpiresIn) * time.Second)
+	} else {
+		t.tokenExpiresAt = time.Now().Add(55 * time.Minute) // Default 55 min
+	}
+
 	return result.AccessToken, nil
 }
 
@@ -717,26 +746,55 @@ func (t *TidalDownloader) DownloadFile(downloadURL, outputPath, itemID string) e
 		return fmt.Errorf("download failed: HTTP %d", resp.StatusCode)
 	}
 
+	expectedSize := resp.ContentLength
 	// Set total bytes if available
-	if resp.ContentLength > 0 && itemID != "" {
+	if expectedSize > 0 && itemID != "" {
-		SetItemBytesTotal(itemID, resp.ContentLength)
+		SetItemBytesTotal(itemID, expectedSize)
 	}
 
 	out, err := os.Create(outputPath)
 	if err != nil {
 		return err
 	}
-	defer out.Close()
 
-	// Use item progress writer
+	// Use buffered writer for better performance (256KB buffer)
+	bufWriter := bufio.NewWriterSize(out, 256*1024)
+
+	// Use item progress writer with buffered output
+	var written int64
 	if itemID != "" {
-		progressWriter := NewItemProgressWriter(out, itemID)
+		progressWriter := NewItemProgressWriter(bufWriter, itemID)
-		_, err = io.Copy(progressWriter, resp.Body)
+		written, err = io.Copy(progressWriter, resp.Body)
 	} else {
 		// Fallback: direct copy without progress tracking
-		_, err = io.Copy(out, resp.Body)
+		written, err = io.Copy(bufWriter, resp.Body)
 	}
-	return err
+
+	// Flush buffer before checking for errors
+	flushErr := bufWriter.Flush()
+	closeErr := out.Close()
+
+	// Check for any errors
+	if err != nil {
+		os.Remove(outputPath)
+		return fmt.Errorf("download interrupted: %w", err)
+	}
+	if flushErr != nil {
+		os.Remove(outputPath)
+		return fmt.Errorf("failed to flush buffer: %w", flushErr)
+	}
+	if closeErr != nil {
+		os.Remove(outputPath)
+		return fmt.Errorf("failed to close file: %w", closeErr)
+	}
+
+	// Verify file size if Content-Length was provided
+	if expectedSize > 0 && written != expectedSize {
+		os.Remove(outputPath)
+		return fmt.Errorf("incomplete download: expected %d bytes, got %d bytes", expectedSize, written)
+	}
+
+	return nil
 }
 
 func (t *TidalDownloader) downloadFromManifest(manifestB64, outputPath, itemID string) error {
@@ -772,26 +830,44 @@ func (t *TidalDownloader) downloadFromManifest(manifestB64, outputPath, itemID s
 			return fmt.Errorf("download failed with status %d", resp.StatusCode)
 		}
 
+		expectedSize := resp.ContentLength
 		// Set total bytes for progress tracking
-		if resp.ContentLength > 0 && itemID != "" {
+		if expectedSize > 0 && itemID != "" {
-			SetItemBytesTotal(itemID, resp.ContentLength)
+			SetItemBytesTotal(itemID, expectedSize)
 		}
 
 		out, err := os.Create(outputPath)
 		if err != nil {
 			return fmt.Errorf("failed to create file: %w", err)
 		}
-		defer out.Close()
 
 		// Use item progress writer
+		var written int64
 		if itemID != "" {
 			progressWriter := NewItemProgressWriter(out, itemID)
-			_, err = io.Copy(progressWriter, resp.Body)
+			written, err = io.Copy(progressWriter, resp.Body)
 		} else {
-			// Fallback: direct copy without progress tracking
+			written, err = io.Copy(out, resp.Body)
-			_, err = io.Copy(out, resp.Body)
 		}
-		return err
+
+		closeErr := out.Close()
+
+		if err != nil {
+			os.Remove(outputPath)
+			return fmt.Errorf("download interrupted: %w", err)
+		}
+		if closeErr != nil {
+			os.Remove(outputPath)
+			return fmt.Errorf("failed to close file: %w", closeErr)
+		}
+
+		// Verify file size if Content-Length was provided
+		if expectedSize > 0 && written != expectedSize {
+			os.Remove(outputPath)
+			return fmt.Errorf("incomplete download: expected %d bytes, got %d bytes", expectedSize, written)
+		}
+
+		return nil
 	}
 
 	// DASH format - download segments to temporary file
@@ -942,8 +1018,44 @@ func downloadFromTidal(req DownloadRequest) (TidalDownloadResult, error) {
 	var track *TidalTrack
 	var err error
 
-	// Strategy 1: Try to get Tidal URL from SongLink (using Spotify ID)
+	// OPTIMIZATION: Check cache first for track ID
-	if req.SpotifyID != "" {
+	if req.ISRC != "" {
+		if cached := GetTrackIDCache().Get(req.ISRC); cached != nil && cached.TidalTrackID > 0 {
+			fmt.Printf("[Tidal] Cache hit! Using cached track ID: %d\n", cached.TidalTrackID)
+			track, err = downloader.GetTrackInfoByID(cached.TidalTrackID)
+			if err != nil {
+				fmt.Printf("[Tidal] Cache hit but failed to get track info: %v\n", err)
+				track = nil // Fall through to normal search
+			}
+		}
+	}
+
+	// OPTIMIZED: Try ISRC search first (faster than SongLink API)
+	// Strategy 1: Search by ISRC with duration verification (FASTEST)
+	if track == nil && req.ISRC != "" {
+		fmt.Printf("[Tidal] Trying ISRC search first (faster): %s\n", req.ISRC)
+		track, err = downloader.SearchTrackByMetadataWithISRC(req.TrackName, req.ArtistName, req.ISRC, expectedDurationSec)
+		// Verify artist for ISRC match
+		if track != nil {
+			tidalArtist := track.Artist.Name
+			if len(track.Artists) > 0 {
+				var artistNames []string
+				for _, a := range track.Artists {
+					artistNames = append(artistNames, a.Name)
+				}
+				tidalArtist = strings.Join(artistNames, ", ")
+			}
+			if !artistsMatch(req.ArtistName, tidalArtist) {
+				fmt.Printf("[Tidal] Artist mismatch from ISRC search: expected '%s', got '%s'. Rejecting.\n", 
+					req.ArtistName, tidalArtist)
+				track = nil
+			}
+		}
+	}
+
+	// Strategy 2: Try SongLink only if ISRC search failed (slower but more accurate)
+	if track == nil && req.SpotifyID != "" {
+		fmt.Printf("[Tidal] ISRC search failed, trying SongLink...\n")
 		tidalURL, slErr := downloader.GetTidalURLFromSpotify(req.SpotifyID)
 		if slErr == nil && tidalURL != "" {
 			// Extract track ID and get track info
@@ -986,29 +1098,9 @@ func downloadFromTidal(req DownloadRequest) (TidalDownloadResult, error) {
 		}
 	}
 
-	// Strategy 2: Search by ISRC with duration verification
+	// Strategy 3: Search by metadata only (no ISRC requirement) - last resort
-	if track == nil && req.ISRC != "" {
-		track, err = downloader.SearchTrackByMetadataWithISRC(req.TrackName, req.ArtistName, req.ISRC, expectedDurationSec)
-		// Verify artist for ISRC match too
-		if track != nil {
-			tidalArtist := track.Artist.Name
-			if len(track.Artists) > 0 {
-				var artistNames []string
-				for _, a := range track.Artists {
-					artistNames = append(artistNames, a.Name)
-				}
-				tidalArtist = strings.Join(artistNames, ", ")
-			}
-			if !artistsMatch(req.ArtistName, tidalArtist) {
-				fmt.Printf("[Tidal] Artist mismatch from ISRC search: expected '%s', got '%s'. Rejecting.\n", 
-					req.ArtistName, tidalArtist)
-				track = nil
-			}
-		}
-	}
-
-	// Strategy 3: Search by metadata only (no ISRC requirement)
 	if track == nil {
+		fmt.Printf("[Tidal] Trying metadata search as last resort...\n")
 		track, err = downloader.SearchTrackByMetadataWithISRC(req.TrackName, req.ArtistName, "", expectedDurationSec)
 		// Verify artist for metadata search too
 		if track != nil {
@@ -1047,6 +1139,11 @@ func downloadFromTidal(req DownloadRequest) (TidalDownloadResult, error) {
 	}
 	fmt.Printf("[Tidal] Match found: '%s' by '%s' (duration: %ds)\n", track.Title, tidalArtist, track.Duration)
 
+	// Cache the track ID for future use
+	if req.ISRC != "" {
+		GetTrackIDCache().SetTidal(req.ISRC, track.ID)
+	}
+
 	// Build filename
 	filename := buildFilenameFromTemplate(req.FilenameFormat, map[string]interface{}{
 		"title":  req.TrackName,
@@ -1080,11 +1177,29 @@ func downloadFromTidal(req DownloadRequest) (TidalDownloadResult, error) {
 	// Log actual quality received
 	fmt.Printf("[Tidal] Actual quality: %d-bit/%dHz\n", downloadInfo.BitDepth, downloadInfo.SampleRate)
 
-	// Download file with item ID for progress tracking
+	// START PARALLEL: Fetch cover and lyrics while downloading audio
+	var parallelResult *ParallelDownloadResult
+	parallelDone := make(chan struct{})
+	go func() {
+		defer close(parallelDone)
+		parallelResult = FetchCoverAndLyricsParallel(
+			req.CoverURL,
+			req.EmbedMaxQualityCover,
+			req.SpotifyID,
+			req.TrackName,
+			req.ArtistName,
+			req.EmbedLyrics,
+		)
+	}()
+
+	// Download audio file with item ID for progress tracking
 	if err := downloader.DownloadFile(downloadInfo.URL, outputPath, req.ItemID); err != nil {
 		return TidalDownloadResult{}, fmt.Errorf("download failed: %w", err)
 	}
 
+	// Wait for parallel operations to complete
+	<-parallelDone
+
 	// Set progress to 100% and status to finalizing (before embedding)
 	// This makes the UI show "Finalizing..." while embedding happens
 	if req.ItemID != "" {
@@ -1105,7 +1220,7 @@ func downloadFromTidal(req DownloadRequest) (TidalDownloadResult, error) {
 		return TidalDownloadResult{}, fmt.Errorf("download completed but file not found at %s or %s", outputPath, m4aPath)
 	}
 
-	// Embed metadata
+	// Embed metadata using parallel-fetched cover data
 	metadata := Metadata{
 		Title:       req.TrackName,
 		Artist:      req.ArtistName,
@@ -1118,17 +1233,11 @@ func downloadFromTidal(req DownloadRequest) (TidalDownloadResult, error) {
 		ISRC:        req.ISRC,
 	}
 
-	// Download cover to memory (avoids file permission issues on Android)
+	// Use cover data from parallel fetch
 	var coverData []byte
-	if req.CoverURL != "" {
+	if parallelResult != nil && parallelResult.CoverData != nil {
-		fmt.Println("[Tidal] Downloading cover to memory...")
+		coverData = parallelResult.CoverData
-		data, err := downloadCoverToMemory(req.CoverURL, req.EmbedMaxQualityCover)
+		fmt.Printf("[Tidal] Using parallel-fetched cover (%d bytes)\n", len(coverData))
-		if err == nil {
-			coverData = data
-			fmt.Printf("[Tidal] Cover downloaded successfully (%d bytes)\n", len(coverData))
-		} else {
-			fmt.Printf("[Tidal] Warning: failed to download cover: %v\n", err)
-		}
 	}
 
 	// Only embed metadata to FLAC files (M4A will be converted by Flutter)
@@ -1137,24 +1246,16 @@ func downloadFromTidal(req DownloadRequest) (TidalDownloadResult, error) {
 			fmt.Printf("Warning: failed to embed metadata: %v\n", err)
 		}
 
-		// Embed lyrics if enabled
+		// Embed lyrics from parallel fetch
-		if req.EmbedLyrics {
+		if req.EmbedLyrics && parallelResult != nil && parallelResult.LyricsLRC != "" {
-			fmt.Println("[Tidal] Fetching lyrics...")
+			fmt.Printf("[Tidal] Embedding parallel-fetched lyrics (%d lines)...\n", len(parallelResult.LyricsData.Lines))
-			lyricsClient := NewLyricsClient()
+			if embedErr := EmbedLyrics(actualOutputPath, parallelResult.LyricsLRC); embedErr != nil {
-			lyrics, lyricsErr := lyricsClient.FetchLyricsAllSources(req.SpotifyID, req.TrackName, req.ArtistName)
+				fmt.Printf("[Tidal] Warning: failed to embed lyrics: %v\n", embedErr)
-			if lyricsErr != nil {
-				fmt.Printf("[Tidal] Warning: lyrics fetch error: %v\n", lyricsErr)
-			} else if lyrics == nil || len(lyrics.Lines) == 0 {
-				fmt.Println("[Tidal] No lyrics found for this track")
 			} else {
-				fmt.Printf("[Tidal] Lyrics found (%d lines), embedding...\n", len(lyrics.Lines))
+				fmt.Println("[Tidal] Lyrics embedded successfully")
-				lrcContent := convertToLRC(lyrics)
-				if embedErr := EmbedLyrics(actualOutputPath, lrcContent); embedErr != nil {
-					fmt.Printf("[Tidal] Warning: failed to embed lyrics: %v\n", embedErr)
-				} else {
-					fmt.Println("[Tidal] Lyrics embedded successfully")
-				}
 			}
+		} else if req.EmbedLyrics {
+			fmt.Println("[Tidal] No lyrics available from parallel fetch")
 		}
 	} else {
 		fmt.Printf("[Tidal] Skipping metadata embed for M4A file (will be handled after conversion): %s\n", actualOutputPath)

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 = '2.0.6';
+  static const String version = '2.1.5';
-  static const String buildNumber = '36';
+  static const String buildNumber = '43';
   static const String fullVersion = '$version+$buildNumber';
   
   
@@ -15,4 +15,6 @@ class AppInfo {
   static const String githubRepo = 'zarzet/SpotiFLAC-Mobile';
   static const String githubUrl = 'https://github.com/$githubRepo';
   static const String originalGithubUrl = 'https://github.com/afkarxyz/SpotiFLAC';
+  
+  static const String kofiUrl = 'https://ko-fi.com/zarzet';
 }

lib/models/settings.dart

@@ -14,6 +14,7 @@ class AppSettings {
   final bool isFirstLaunch;
   final int concurrentDownloads; // 1 = sequential (default), max 3
   final bool checkForUpdates; // Check for updates on app start
+  final String updateChannel; // stable, preview
   final bool hasSearchedBefore; // Hide helper text after first search
   final String folderOrganization; // none, artist, album, artist_album
   final String historyViewMode; // list, grid
@@ -21,9 +22,10 @@ class AppSettings {
   final String spotifyClientId; // Custom Spotify client ID (empty = use default)
   final String spotifyClientSecret; // Custom Spotify client secret (empty = use default)
   final bool useCustomSpotifyCredentials; // Whether to use custom credentials (if set)
+  final String metadataSource; // spotify, deezer - source for search and metadata
 
   const AppSettings({
-    this.defaultService = 'tidal',
+    this.defaultService = 'qobuz',
     this.audioQuality = 'LOSSLESS',
     this.filenameFormat = '{title} - {artist}',
     this.downloadDirectory = '',
@@ -33,6 +35,7 @@ class AppSettings {
     this.isFirstLaunch = true,
     this.concurrentDownloads = 1, // Default: sequential (off)
     this.checkForUpdates = true, // Default: enabled
+    this.updateChannel = 'stable', // Default: stable releases only
     this.hasSearchedBefore = false, // Default: show helper text
     this.folderOrganization = 'none', // Default: no folder organization
     this.historyViewMode = 'grid', // Default: grid view
@@ -40,6 +43,7 @@ class AppSettings {
     this.spotifyClientId = '', // Default: use built-in credentials
     this.spotifyClientSecret = '', // Default: use built-in credentials
     this.useCustomSpotifyCredentials = true, // Default: use custom if set
+    this.metadataSource = 'deezer', // Default: Deezer (no rate limit)
   });
 
   AppSettings copyWith({
@@ -53,6 +57,7 @@ class AppSettings {
     bool? isFirstLaunch,
     int? concurrentDownloads,
     bool? checkForUpdates,
+    String? updateChannel,
     bool? hasSearchedBefore,
     String? folderOrganization,
     String? historyViewMode,
@@ -60,6 +65,7 @@ class AppSettings {
     String? spotifyClientId,
     String? spotifyClientSecret,
     bool? useCustomSpotifyCredentials,
+    String? metadataSource,
   }) {
     return AppSettings(
       defaultService: defaultService ?? this.defaultService,
@@ -72,6 +78,7 @@ class AppSettings {
       isFirstLaunch: isFirstLaunch ?? this.isFirstLaunch,
       concurrentDownloads: concurrentDownloads ?? this.concurrentDownloads,
       checkForUpdates: checkForUpdates ?? this.checkForUpdates,
+      updateChannel: updateChannel ?? this.updateChannel,
       hasSearchedBefore: hasSearchedBefore ?? this.hasSearchedBefore,
       folderOrganization: folderOrganization ?? this.folderOrganization,
       historyViewMode: historyViewMode ?? this.historyViewMode,
@@ -79,6 +86,7 @@ class AppSettings {
       spotifyClientId: spotifyClientId ?? this.spotifyClientId,
       spotifyClientSecret: spotifyClientSecret ?? this.spotifyClientSecret,
       useCustomSpotifyCredentials: useCustomSpotifyCredentials ?? this.useCustomSpotifyCredentials,
+      metadataSource: metadataSource ?? this.metadataSource,
     );
   }
 

lib/models/settings.g.dart

@@ -17,6 +17,7 @@ AppSettings _$AppSettingsFromJson(Map<String, dynamic> json) => AppSettings(
   isFirstLaunch: json['isFirstLaunch'] as bool? ?? true,
   concurrentDownloads: (json['concurrentDownloads'] as num?)?.toInt() ?? 1,
   checkForUpdates: json['checkForUpdates'] as bool? ?? true,
+  updateChannel: json['updateChannel'] as String? ?? 'stable',
   hasSearchedBefore: json['hasSearchedBefore'] as bool? ?? false,
   folderOrganization: json['folderOrganization'] as String? ?? 'none',
   historyViewMode: json['historyViewMode'] as String? ?? 'grid',
@@ -25,6 +26,7 @@ AppSettings _$AppSettingsFromJson(Map<String, dynamic> json) => AppSettings(
   spotifyClientSecret: json['spotifyClientSecret'] as String? ?? '',
   useCustomSpotifyCredentials:
       json['useCustomSpotifyCredentials'] as bool? ?? true,
+  metadataSource: json['metadataSource'] as String? ?? 'deezer',
 );
 
 Map<String, dynamic> _$AppSettingsToJson(AppSettings instance) =>
@@ -39,6 +41,7 @@ Map<String, dynamic> _$AppSettingsToJson(AppSettings instance) =>
       'isFirstLaunch': instance.isFirstLaunch,
       'concurrentDownloads': instance.concurrentDownloads,
       'checkForUpdates': instance.checkForUpdates,
+      'updateChannel': instance.updateChannel,
       'hasSearchedBefore': instance.hasSearchedBefore,
       'folderOrganization': instance.folderOrganization,
       'historyViewMode': instance.historyViewMode,
@@ -46,4 +49,5 @@ Map<String, dynamic> _$AppSettingsToJson(AppSettings instance) =>
       'spotifyClientId': instance.spotifyClientId,
       'spotifyClientSecret': instance.spotifyClientSecret,
       'useCustomSpotifyCredentials': instance.useCustomSpotifyCredentials,
+      'metadataSource': instance.metadataSource,
     };

lib/models/theme_settings.dart

@@ -4,6 +4,7 @@ import 'package:flutter/material.dart';
 const String kThemeModeKey = 'theme_mode';
 const String kUseDynamicColorKey = 'use_dynamic_color';
 const String kSeedColorKey = 'seed_color';
+const String kUseAmoledKey = 'use_amoled';
 
 /// Default Spotify green color for fallback
 const int kDefaultSeedColor = 0xFF1DB954;
@@ -13,11 +14,13 @@ class ThemeSettings {
   final ThemeMode themeMode;
   final bool useDynamicColor;
   final int seedColorValue;
+  final bool useAmoled; // Pure black background for OLED screens
 
   const ThemeSettings({
     this.themeMode = ThemeMode.system,
     this.useDynamicColor = true,
     this.seedColorValue = kDefaultSeedColor,
+    this.useAmoled = false,
   });
 
   /// Get seed color as Color object
@@ -28,11 +31,13 @@ class ThemeSettings {
     ThemeMode? themeMode,
     bool? useDynamicColor,
     int? seedColorValue,
+    bool? useAmoled,
   }) {
     return ThemeSettings(
       themeMode: themeMode ?? this.themeMode,
       useDynamicColor: useDynamicColor ?? this.useDynamicColor,
       seedColorValue: seedColorValue ?? this.seedColorValue,
+      useAmoled: useAmoled ?? this.useAmoled,
     );
   }
 
@@ -41,6 +46,7 @@ class ThemeSettings {
         kThemeModeKey: themeMode.name,
         kUseDynamicColorKey: useDynamicColor,
         kSeedColorKey: seedColorValue,
+        kUseAmoledKey: useAmoled,
       };
 
   /// Create from JSON map
@@ -49,6 +55,7 @@ class ThemeSettings {
       themeMode: _themeModeFromString(json[kThemeModeKey] as String?),
       useDynamicColor: json[kUseDynamicColorKey] as bool? ?? true,
       seedColorValue: json[kSeedColorKey] as int? ?? kDefaultSeedColor,
+      useAmoled: json[kUseAmoledKey] as bool? ?? false,
     );
   }
 
@@ -58,12 +65,13 @@ class ThemeSettings {
     return other is ThemeSettings &&
         other.themeMode == themeMode &&
         other.useDynamicColor == useDynamicColor &&
-        other.seedColorValue == seedColorValue;
+        other.seedColorValue == seedColorValue &&
+        other.useAmoled == useAmoled;
   }
 
   @override
   int get hashCode =>
-      themeMode.hashCode ^ useDynamicColor.hashCode ^ seedColorValue.hashCode;
+      themeMode.hashCode ^ useDynamicColor.hashCode ^ seedColorValue.hashCode ^ useAmoled.hashCode;
 }
 
 /// Helper to convert string to ThemeMode

lib/providers/download_queue_provider.dart

@@ -4,8 +4,6 @@ import 'dart:io';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:path_provider/path_provider.dart';
 import 'package:shared_preferences/shared_preferences.dart';
-import 'package:ffmpeg_kit_flutter_new_audio/ffmpeg_kit.dart';
-import 'package:ffmpeg_kit_flutter_new_audio/return_code.dart';
 import 'package:spotiflac_android/models/download_item.dart';
 import 'package:spotiflac_android/models/settings.dart';
 import 'package:spotiflac_android/models/track.dart';
@@ -688,20 +686,37 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
     }
   }
 
-  /// Retry a failed download
+  /// Retry a failed or skipped download
   void retryItem(String id) {
-    final items = state.items.map((item) {
+    final item = state.items.where((i) => i.id == id).firstOrNull;
-      if (item.id == id && item.status == DownloadStatus.failed) {
+    if (item == null) {
-        return item.copyWith(status: DownloadStatus.queued, progress: 0, error: null);
+      _log.w('retryItem: Item not found: $id');
+      return;
+    }
+    
+    // Only retry if status is failed or skipped
+    if (item.status != DownloadStatus.failed && item.status != DownloadStatus.skipped) {
+      _log.w('retryItem: Item status is ${item.status}, not retrying');
+      return;
+    }
+    
+    _log.i('Retrying item: ${item.track.name} (id: $id)');
+    
+    final items = state.items.map((i) {
+      if (i.id == id) {
+        return i.copyWith(status: DownloadStatus.queued, progress: 0, error: null);
       }
-      return item;
+      return i;
     }).toList();
     state = state.copyWith(items: items);
     _saveQueueToStorage(); // Persist queue
     
-    // Start processing if not already
+    // Start processing if not already running
     if (!state.isProcessing) {
+      _log.d('Starting queue processing for retry');
       Future.microtask(() => _processQueue());
+    } else {
+      _log.d('Queue already processing, item will be picked up');
     }
   }
 
@@ -745,25 +760,12 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
       // For now, we'll use FFmpeg to embed cover since Go backend expects to download the file
       // FFmpeg can embed cover art to FLAC
       if (coverPath != null && await File(coverPath).exists()) {
-        final tempOutput = '$flacPath.tmp';
+        final result = await FFmpegService.embedCover(flacPath, coverPath);
-        final command = '-i "$flacPath" -i "$coverPath" -map 0:a -map 1:0 -c copy -metadata:s:v title="Album cover" -metadata:s:v comment="Cover (front)" -disposition:v attached_pic "$tempOutput" -y';
         
-        final session = await FFmpegKit.execute(command);
+        if (result != null) {
-        final returnCode = await session.getReturnCode();
-        
-        if (ReturnCode.isSuccess(returnCode)) {
-          // Replace original with temp
-          await File(flacPath).delete();
-          await File(tempOutput).rename(flacPath);
           _log.d('Cover embedded via FFmpeg');
         } else {
-          // Try alternative method using metaflac-style embedding
+          _log.w('FFmpeg cover embed failed');
-          _log.w('FFmpeg cover embed failed, trying alternative...');
-          // Clean up temp file if exists
-          final tempFile = File(tempOutput);
-          if (await tempFile.exists()) {
-            await tempFile.delete();
-          }
         }
         
         // Clean up cover file
@@ -866,6 +868,13 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
     
     _log.i('Queue processing finished');
     state = state.copyWith(isProcessing: false, currentDownload: null);
+    
+    // Check if there are new queued items (e.g., from retry) and restart if needed
+    final hasQueuedItems = state.items.any((item) => item.status == DownloadStatus.queued);
+    if (hasQueuedItems) {
+      _log.i('Found queued items after processing finished, restarting queue...');
+      Future.microtask(() => _processQueue());
+    }
   }
 
   /// Sequential download processing (uses multi-progress system with single item)
@@ -881,7 +890,9 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
         continue;
       }
       
-      final nextItem = state.items.firstWhere(
+      // Re-read state to get latest items (important for retry)
+      final currentItems = state.items;
+      final nextItem = currentItems.firstWhere(
         (item) => item.status == DownloadStatus.queued,
         orElse: () => DownloadItem(
           id: '',
@@ -892,10 +903,11 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
       );
 
       if (nextItem.id.isEmpty) {
-        _log.d('No more items to process');
+        _log.d('No more items to process (checked ${currentItems.length} items)');
         break;
       }
 
+      _log.d('Processing next item: ${nextItem.track.name} (id: ${nextItem.id})');
       await _downloadSingleItem(nextItem);
       
       // Clear item progress after download completes

lib/providers/settings_provider.dart

@@ -5,6 +5,8 @@ import 'package:spotiflac_android/models/settings.dart';
 import 'package:spotiflac_android/services/platform_bridge.dart';
 
 const _settingsKey = 'app_settings';
+const _migrationVersionKey = 'settings_migration_version';
+const _currentMigrationVersion = 1;
 
 class SettingsNotifier extends Notifier<AppSettings> {
   @override
@@ -18,11 +20,35 @@ class SettingsNotifier extends Notifier<AppSettings> {
     final json = prefs.getString(_settingsKey);
     if (json != null) {
       state = AppSettings.fromJson(jsonDecode(json));
+      
+      // Run migrations if needed
+      await _runMigrations(prefs);
+      
       // Apply Spotify credentials to Go backend on load
       _applySpotifyCredentials();
     }
   }
 
+  /// Run one-time migrations for settings
+  Future<void> _runMigrations(SharedPreferences prefs) async {
+    final lastMigration = prefs.getInt(_migrationVersionKey) ?? 0;
+    
+    if (lastMigration < 1) {
+      // Migration 1: Set metadataSource to 'deezer' for existing users
+      // Only apply if user hasn't enabled custom Spotify credentials
+      // (users with custom credentials likely prefer Spotify)
+      if (!state.useCustomSpotifyCredentials) {
+        state = state.copyWith(metadataSource: 'deezer');
+        await _saveSettings();
+      }
+    }
+    
+    // Save current migration version
+    if (lastMigration < _currentMigrationVersion) {
+      await prefs.setInt(_migrationVersionKey, _currentMigrationVersion);
+    }
+  }
+
   Future<void> _saveSettings() async {
     final prefs = await SharedPreferences.getInstance();
     await prefs.setString(_settingsKey, jsonEncode(state.toJson()));
@@ -96,6 +122,11 @@ class SettingsNotifier extends Notifier<AppSettings> {
     _saveSettings();
   }
 
+  void setUpdateChannel(String channel) {
+    state = state.copyWith(updateChannel: channel);
+    _saveSettings();
+  }
+
   void setHasSearchedBefore() {
     if (!state.hasSearchedBefore) {
       state = state.copyWith(hasSearchedBefore: true);
@@ -151,6 +182,11 @@ class SettingsNotifier extends Notifier<AppSettings> {
     _saveSettings();
     _applySpotifyCredentials();
   }
+
+  void setMetadataSource(String source) {
+    state = state.copyWith(metadataSource: source);
+    _saveSettings();
+  }
 }
 
 final settingsProvider = NotifierProvider<SettingsNotifier, AppSettings>(

lib/providers/theme_provider.dart

@@ -24,11 +24,13 @@ class ThemeNotifier extends Notifier<ThemeSettings> {
       final modeString = prefs.getString(kThemeModeKey);
       final useDynamic = prefs.getBool(kUseDynamicColorKey);
       final seedColor = prefs.getInt(kSeedColorKey);
+      final useAmoled = prefs.getBool(kUseAmoledKey);
 
       state = ThemeSettings(
         themeMode: _themeModeFromString(modeString),
         useDynamicColor: useDynamic ?? true,
         seedColorValue: seedColor ?? kDefaultSeedColor,
+        useAmoled: useAmoled ?? false,
       );
     } catch (e) {
       debugPrint('Error loading theme settings: $e');
@@ -43,6 +45,7 @@ class ThemeNotifier extends Notifier<ThemeSettings> {
       await prefs.setString(kThemeModeKey, state.themeMode.name);
       await prefs.setBool(kUseDynamicColorKey, state.useDynamicColor);
       await prefs.setInt(kSeedColorKey, state.seedColorValue);
+      await prefs.setBool(kUseAmoledKey, state.useAmoled);
     } catch (e) {
       debugPrint('Error saving theme settings: $e');
     }
@@ -72,6 +75,12 @@ class ThemeNotifier extends Notifier<ThemeSettings> {
     await _saveToStorage();
   }
 
+  /// Enable or disable AMOLED mode (pure black background)
+  Future<void> setUseAmoled(bool value) async {
+    state = state.copyWith(useAmoled: value);
+    await _saveToStorage();
+  }
+
   /// Helper to convert string to ThemeMode
   ThemeMode _themeModeFromString(String? value) {
     if (value == null) return ThemeMode.system;

lib/providers/track_provider.dart

@@ -114,7 +114,7 @@ class TrackNotifier extends Notifier<TrackState> {
   /// Check if request is still valid (not cancelled by newer request)
   bool _isRequestValid(int requestId) => requestId == _currentRequestId;
 
-  Future<void> fetchFromUrl(String url) async {
+  Future<void> fetchFromUrl(String url, {bool useDeezerFallback = true}) async {
     // Increment request ID to cancel any pending requests
     final requestId = ++_currentRequestId;
 
@@ -127,7 +127,22 @@ class TrackNotifier extends Notifier<TrackState> {
       
       final type = parsed['type'] as String;
 
-      final metadata = await PlatformBridge.getSpotifyMetadata(url);
+      // Use the new fallback-enabled method
+      Map<String, dynamic> metadata;
+      
+      try {
+        // ignore: avoid_print
+        print('[FetchURL] Fetching $type with Deezer fallback enabled...');
+        metadata = await PlatformBridge.getSpotifyMetadataWithFallback(url);
+        // ignore: avoid_print
+        print('[FetchURL] Metadata fetch success');
+      } catch (e) {
+        // If fallback also fails, show error
+        // ignore: avoid_print
+        print('[FetchURL] Metadata fetch failed: $e');
+        rethrow;
+      }
+      
       if (!_isRequestValid(requestId)) return; // Request cancelled
 
       if (type == 'track') {
@@ -149,6 +164,8 @@ class TrackNotifier extends Notifier<TrackState> {
           albumName: albumInfo['name'] as String?,
           coverUrl: albumInfo['images'] as String?,
         );
+        // Pre-warm cache for album tracks in background
+        _preWarmCacheForTracks(tracks);
       } else if (type == 'playlist') {
         final playlistInfo = metadata['playlist_info'] as Map<String, dynamic>;
         final trackList = metadata['track_list'] as List<dynamic>;
@@ -160,6 +177,8 @@ class TrackNotifier extends Notifier<TrackState> {
           playlistName: owner?['name'] as String?,
           coverUrl: owner?['images'] as String?,
         );
+        // Pre-warm cache for playlist tracks in background
+        _preWarmCacheForTracks(tracks);
       } else if (type == 'artist') {
         final artistInfo = metadata['artist_info'] as Map<String, dynamic>;
         final albumsList = metadata['albums'] as List<dynamic>;
@@ -180,7 +199,7 @@ class TrackNotifier extends Notifier<TrackState> {
     }
   }
 
-  Future<void> search(String query) async {
+  Future<void> search(String query, {String? metadataSource}) async {
     // Increment request ID to cancel any pending requests
     final requestId = ++_currentRequestId;
 
@@ -188,7 +207,24 @@ class TrackNotifier extends Notifier<TrackState> {
     state = TrackState(isLoading: true, hasSearchText: state.hasSearchText);
 
     try {
-      final results = await PlatformBridge.searchSpotifyAll(query, trackLimit: 20, artistLimit: 5);
+      // Use Deezer or Spotify based on settings
+      final source = metadataSource ?? 'deezer';
+      
+      // Debug log to show which source is being used
+      // ignore: avoid_print
+      print('[Search] Using metadata source: $source for query: "$query"');
+      
+      Map<String, dynamic> results;
+      if (source == 'deezer') {
+        results = await PlatformBridge.searchDeezerAll(query, trackLimit: 20, artistLimit: 5);
+        // ignore: avoid_print
+        print('[Search] Deezer returned ${(results['tracks'] as List?)?.length ?? 0} tracks');
+      } else {
+        results = await PlatformBridge.searchSpotifyAll(query, trackLimit: 20, artistLimit: 5);
+        // ignore: avoid_print
+        print('[Search] Spotify returned ${(results['tracks'] as List?)?.length ?? 0} tracks');
+      }
+      
       if (!_isRequestValid(requestId)) return; // Request cancelled
       
       final trackList = results['tracks'] as List<dynamic>? ?? [];
@@ -310,6 +346,28 @@ class TrackNotifier extends Notifier<TrackState> {
       popularity: data['popularity'] as int? ?? 0,
     );
   }
+
+  /// Pre-warm track ID cache for faster downloads
+  /// Runs in background, doesn't block UI
+  void _preWarmCacheForTracks(List<Track> tracks) {
+    // Only pre-warm if we have tracks with ISRC
+    final tracksWithIsrc = tracks.where((t) => t.isrc != null && t.isrc!.isNotEmpty).toList();
+    if (tracksWithIsrc.isEmpty) return;
+
+    // Build request list for Go backend
+    final cacheRequests = tracksWithIsrc.map((t) => {
+      'isrc': t.isrc!,
+      'track_name': t.name,
+      'artist_name': t.artistName,
+      'spotify_id': t.id, // Include Spotify ID for Amazon lookup
+      'service': 'tidal', // Default to tidal for pre-warming
+    }).toList();
+
+    // Fire and forget - runs in background
+    PlatformBridge.preWarmTrackCache(cacheRequests).catchError((_) {
+      // Silently ignore errors - this is just an optimization
+    });
+  }
 }
 
 final trackProvider = NotifierProvider<TrackNotifier, TrackState>(

lib/screens/album_screen.dart

@@ -71,8 +71,22 @@ class _AlbumScreenState extends ConsumerState<AlbumScreen> {
   Future<void> _fetchTracks() async {
     setState(() => _isLoading = true);
     try {
-      final url = 'https://open.spotify.com/album/${widget.albumId}';
+      Map<String, dynamic> metadata;
-      final metadata = await PlatformBridge.getSpotifyMetadata(url);
+      
+      // Check if this is a Deezer album ID (format: "deezer:123456")
+      if (widget.albumId.startsWith('deezer:')) {
+        final deezerAlbumId = widget.albumId.replaceFirst('deezer:', '');
+        // ignore: avoid_print
+        print('[AlbumScreen] Fetching from Deezer: $deezerAlbumId');
+        metadata = await PlatformBridge.getDeezerMetadata('album', deezerAlbumId);
+      } else {
+        // Spotify album - use fallback method
+        // ignore: avoid_print
+        print('[AlbumScreen] Fetching from Spotify with fallback: ${widget.albumId}');
+        final url = 'https://open.spotify.com/album/${widget.albumId}';
+        metadata = await PlatformBridge.getSpotifyMetadataWithFallback(url);
+      }
+      
       final trackList = metadata['track_list'] as List<dynamic>;
       final tracks = trackList.map((t) => _parseTrack(t as Map<String, dynamic>)).toList();
       
@@ -302,8 +316,8 @@ class _AlbumScreenState extends ConsumerState<AlbumScreen> {
   void _downloadTrack(BuildContext context, Track track) {
     final settings = ref.read(settingsProvider);
     if (settings.askQualityBeforeDownload) {
-      _showQualityPicker(context, (quality) {
+      _showQualityPicker(context, (quality, service) {
-        ref.read(downloadQueueProvider.notifier).addToQueue(track, settings.defaultService, qualityOverride: quality);
+        ref.read(downloadQueueProvider.notifier).addToQueue(track, service, qualityOverride: quality);
         ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Added "${track.name}" to queue')));
       }, trackName: track.name, artistName: track.artistName, coverUrl: track.coverUrl);
     } else {
@@ -317,8 +331,8 @@ class _AlbumScreenState extends ConsumerState<AlbumScreen> {
     if (tracks == null || tracks.isEmpty) return;
     final settings = ref.read(settingsProvider);
     if (settings.askQualityBeforeDownload) {
-      _showQualityPicker(context, (quality) {
+      _showQualityPicker(context, (quality, service) {
-        ref.read(downloadQueueProvider.notifier).addMultipleToQueue(tracks, settings.defaultService, qualityOverride: quality);
+        ref.read(downloadQueueProvider.notifier).addMultipleToQueue(tracks, service, qualityOverride: quality);
         ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Added ${tracks.length} tracks to queue')));
       }, trackName: '${tracks.length} tracks', artistName: widget.albumName);
     } else {
@@ -327,44 +341,69 @@ class _AlbumScreenState extends ConsumerState<AlbumScreen> {
     }
   }
 
-  void _showQualityPicker(BuildContext context, void Function(String quality) onSelect, {String? trackName, String? artistName, String? coverUrl}) {
+  void _showQualityPicker(BuildContext context, void Function(String quality, String service) onSelect, {String? trackName, String? artistName, String? coverUrl}) {
     final colorScheme = Theme.of(context).colorScheme;
+    final settings = ref.read(settingsProvider);
+    String selectedService = settings.defaultService;
+    
     showModalBottomSheet(
       context: context,
       backgroundColor: colorScheme.surfaceContainerHigh,
       shape: const RoundedRectangleBorder(borderRadius: BorderRadius.vertical(top: Radius.circular(28))),
-      builder: (context) => SafeArea(
+      isScrollControlled: true,
-        child: Column(
+      builder: (context) => StatefulBuilder(
-          mainAxisSize: MainAxisSize.min,
+        builder: (context, setModalState) => SafeArea(
-          crossAxisAlignment: CrossAxisAlignment.start,
+          child: SingleChildScrollView(
-          children: [
+            child: Column(
-            if (trackName != null) ...[
+              mainAxisSize: MainAxisSize.min,
-              _TrackInfoHeader(trackName: trackName, artistName: artistName, coverUrl: coverUrl),
+              crossAxisAlignment: CrossAxisAlignment.start,
-              Divider(height: 1, color: colorScheme.outlineVariant.withValues(alpha: 0.5)),
+              children: [
-            ] else ...[
+                if (trackName != null) ...[
-              const SizedBox(height: 8),
+                  _TrackInfoHeader(trackName: trackName, artistName: artistName, coverUrl: coverUrl),
-              Center(child: Container(width: 40, height: 4, decoration: BoxDecoration(color: colorScheme.onSurfaceVariant.withValues(alpha: 0.4), borderRadius: BorderRadius.circular(2)))),
+                  Divider(height: 1, color: colorScheme.outlineVariant.withValues(alpha: 0.5)),
-            ],
+                ] else ...[
-            Padding(
+                  const SizedBox(height: 8),
-              padding: const EdgeInsets.fromLTRB(24, 16, 24, 8),
+                  Center(child: Container(width: 40, height: 4, decoration: BoxDecoration(color: colorScheme.onSurfaceVariant.withValues(alpha: 0.4), borderRadius: BorderRadius.circular(2)))),
-              child: Text('Select Quality', style: Theme.of(context).textTheme.titleLarge?.copyWith(fontWeight: FontWeight.bold)),
+                ],
-            ),
+                // Service selector
-            // Disclaimer
+                Padding(
-            Padding(
+                  padding: const EdgeInsets.fromLTRB(24, 16, 24, 8),
-              padding: const EdgeInsets.fromLTRB(24, 0, 24, 12),
+                  child: Text('Download From', style: Theme.of(context).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.bold)),
-              child: Text(
-                'Actual quality depends on track availability. Hi-Res may not be available for all tracks.',
-                style: Theme.of(context).textTheme.bodySmall?.copyWith(
-                  color: colorScheme.onSurfaceVariant,
-                  fontStyle: FontStyle.italic,
                 ),
-              ),
+                Padding(
+                  padding: const EdgeInsets.symmetric(horizontal: 20),
+                  child: Row(
+                    children: [
+                      _ServiceChip(label: 'Tidal', isSelected: selectedService == 'tidal', onTap: () => setModalState(() => selectedService = 'tidal')),
+                      const SizedBox(width: 8),
+                      _ServiceChip(label: 'Qobuz', isSelected: selectedService == 'qobuz', onTap: () => setModalState(() => selectedService = 'qobuz')),
+                      const SizedBox(width: 8),
+                      _ServiceChip(label: 'Amazon', isSelected: selectedService == 'amazon', onTap: () => setModalState(() => selectedService = 'amazon')),
+                    ],
+                  ),
+                ),
+                Padding(
+                  padding: const EdgeInsets.fromLTRB(24, 16, 24, 8),
+                  child: Text('Select Quality', style: Theme.of(context).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.bold)),
+                ),
+                // Disclaimer
+                Padding(
+                  padding: const EdgeInsets.fromLTRB(24, 0, 24, 12),
+                  child: Text(
+                    'Actual quality depends on track availability. Hi-Res may not be available for all tracks.',
+                    style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                      color: colorScheme.onSurfaceVariant,
+                      fontStyle: FontStyle.italic,
+                    ),
+                  ),
+                ),
+                _QualityOption(title: 'FLAC Lossless', subtitle: '16-bit / 44.1kHz', icon: Icons.music_note, onTap: () { Navigator.pop(context); onSelect('LOSSLESS', selectedService); }),
+                _QualityOption(title: 'Hi-Res FLAC', subtitle: '24-bit / up to 96kHz', icon: Icons.high_quality, onTap: () { Navigator.pop(context); onSelect('HI_RES', selectedService); }),
+                _QualityOption(title: 'Hi-Res FLAC Max', subtitle: '24-bit / up to 192kHz', icon: Icons.four_k, onTap: () { Navigator.pop(context); onSelect('HI_RES_LOSSLESS', selectedService); }),
+                const SizedBox(height: 16),
+              ],
             ),
-            _QualityOption(title: 'FLAC Lossless', subtitle: '16-bit / 44.1kHz', icon: Icons.music_note, onTap: () { Navigator.pop(context); onSelect('LOSSLESS'); }),
+          ),
-            _QualityOption(title: 'Hi-Res FLAC', subtitle: '24-bit / up to 96kHz', icon: Icons.high_quality, onTap: () { Navigator.pop(context); onSelect('HI_RES'); }),
-            _QualityOption(title: 'Hi-Res FLAC Max', subtitle: '24-bit / up to 192kHz', icon: Icons.four_k, onTap: () { Navigator.pop(context); onSelect('HI_RES_LOSSLESS'); }),
-            const SizedBox(height: 16),
-          ],
         ),
       ),
     );
@@ -455,6 +494,40 @@ class _QualityOption extends StatelessWidget {
   }
 }
 
+class _ServiceChip extends StatelessWidget {
+  final String label;
+  final bool isSelected;
+  final VoidCallback onTap;
+  const _ServiceChip({required this.label, required this.isSelected, required this.onTap});
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    return Expanded(
+      child: GestureDetector(
+        onTap: onTap,
+        child: AnimatedContainer(
+          duration: const Duration(milliseconds: 200),
+          padding: const EdgeInsets.symmetric(vertical: 10),
+          decoration: BoxDecoration(
+            color: isSelected ? colorScheme.primaryContainer : colorScheme.surfaceContainerHighest,
+            borderRadius: BorderRadius.circular(12),
+            border: isSelected ? null : Border.all(color: colorScheme.outlineVariant.withValues(alpha: 0.5)),
+          ),
+          child: Text(
+            label,
+            textAlign: TextAlign.center,
+            style: TextStyle(
+              fontWeight: isSelected ? FontWeight.w600 : FontWeight.normal,
+              color: isSelected ? colorScheme.onPrimaryContainer : colorScheme.onSurfaceVariant,
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+}
+
 class _TrackInfoHeader extends StatefulWidget {
   final String trackName;
   final String? artistName;

lib/screens/artist_screen.dart

@@ -69,10 +69,25 @@ class _ArtistScreenState extends ConsumerState<ArtistScreen> {
   Future<void> _fetchDiscography() async {
     setState(() => _isLoadingDiscography = true);
     try {
-      final url = 'https://open.spotify.com/artist/${widget.artistId}';
+      List<ArtistAlbum> albums;
-      final metadata = await PlatformBridge.getSpotifyMetadata(url);
+      
-      final albumsList = metadata['albums'] as List<dynamic>;
+      // Check if this is a Deezer artist ID (format: "deezer:123456")
-      final albums = albumsList.map((a) => _parseArtistAlbum(a as Map<String, dynamic>)).toList();
+      if (widget.artistId.startsWith('deezer:')) {
+        final deezerArtistId = widget.artistId.replaceFirst('deezer:', '');
+        // ignore: avoid_print
+        print('[ArtistScreen] Fetching from Deezer: $deezerArtistId');
+        final metadata = await PlatformBridge.getDeezerMetadata('artist', deezerArtistId);
+        final albumsList = metadata['albums'] as List<dynamic>;
+        albums = albumsList.map((a) => _parseArtistAlbum(a as Map<String, dynamic>)).toList();
+      } else {
+        // Spotify artist - use fallback method
+        // ignore: avoid_print
+        print('[ArtistScreen] Fetching from Spotify with fallback: ${widget.artistId}');
+        final url = 'https://open.spotify.com/artist/${widget.artistId}';
+        final metadata = await PlatformBridge.getSpotifyMetadataWithFallback(url);
+        final albumsList = metadata['albums'] as List<dynamic>;
+        albums = albumsList.map((a) => _parseArtistAlbum(a as Map<String, dynamic>)).toList();
+      }
       
       // Store in cache
       _ArtistCache.set(widget.artistId, albums);
@@ -290,7 +305,9 @@ class _ArtistScreenState extends ConsumerState<ArtistScreen> {
                       Text(album.name, style: Theme.of(context).textTheme.bodySmall?.copyWith(fontWeight: FontWeight.w600), maxLines: 2, overflow: TextOverflow.ellipsis),
                       const Spacer(),
                       Text(
-                        '${album.releaseDate.length >= 4 ? album.releaseDate.substring(0, 4) : album.releaseDate} • ${album.totalTracks} tracks',
+                        album.totalTracks > 0 
+                            ? '${album.releaseDate.length >= 4 ? album.releaseDate.substring(0, 4) : album.releaseDate} • ${album.totalTracks} tracks'
+                            : album.releaseDate.length >= 4 ? album.releaseDate.substring(0, 4) : album.releaseDate,
                         style: Theme.of(context).textTheme.bodySmall?.copyWith(color: colorScheme.onSurfaceVariant, fontSize: 11),
                         maxLines: 1,
                         overflow: TextOverflow.ellipsis,

lib/screens/home_screen.dart

@@ -38,7 +38,8 @@ class _HomeScreenState extends ConsumerState<HomeScreen> {
     if (url.startsWith('http') || url.startsWith('spotify:')) {
       await ref.read(trackProvider.notifier).fetchFromUrl(url);
     } else {
-      await ref.read(trackProvider.notifier).search(url);
+      final settings = ref.read(settingsProvider);
+      await ref.read(trackProvider.notifier).search(url, metadataSource: settings.metadataSource);
     }
   }
 

lib/screens/home_tab.dart

@@ -81,7 +81,8 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient
     if (_lastSearchQuery == query) return;
     _lastSearchQuery = query;
     
-    await ref.read(trackProvider.notifier).search(query);
+    final settings = ref.read(settingsProvider);
+    await ref.read(trackProvider.notifier).search(query, metadataSource: settings.metadataSource);
     ref.read(settingsProvider.notifier).setHasSearchedBefore();
   }
 
@@ -112,7 +113,8 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient
       await ref.read(trackProvider.notifier).fetchFromUrl(url);
       _navigateToDetailIfNeeded();
     } else {
-      await ref.read(trackProvider.notifier).search(url);
+      final settings = ref.read(settingsProvider);
+      await ref.read(trackProvider.notifier).search(url, metadataSource: settings.metadataSource);
     }
     ref.read(settingsProvider.notifier).setHasSearchedBefore();
   }
@@ -170,8 +172,8 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient
       final settings = ref.read(settingsProvider);
       
       if (settings.askQualityBeforeDownload) {
-        _showQualityPicker(context, (quality) {
+        _showQualityPicker(context, (quality, service) {
-          ref.read(downloadQueueProvider.notifier).addToQueue(track, settings.defaultService, qualityOverride: quality);
+          ref.read(downloadQueueProvider.notifier).addToQueue(track, service, qualityOverride: quality);
           ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Added "${track.name}" to queue')));
         }, trackName: track.name, artistName: track.artistName, coverUrl: track.coverUrl);
       } else {
@@ -181,59 +183,84 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient
     }
   }
 
-  void _showQualityPicker(BuildContext context, void Function(String quality) onSelect, {String? trackName, String? artistName, String? coverUrl}) {
+  void _showQualityPicker(BuildContext context, void Function(String quality, String service) onSelect, {String? trackName, String? artistName, String? coverUrl}) {
     final colorScheme = Theme.of(context).colorScheme;
+    final settings = ref.read(settingsProvider);
+    String selectedService = settings.defaultService;
+    
     showModalBottomSheet(
       context: context,
       backgroundColor: colorScheme.surfaceContainerHigh,
       shape: const RoundedRectangleBorder(borderRadius: BorderRadius.vertical(top: Radius.circular(28))),
-      builder: (context) => SafeArea(
+      isScrollControlled: true,
-        child: Column(
+      builder: (context) => StatefulBuilder(
-          mainAxisSize: MainAxisSize.min,
+        builder: (context, setModalState) => SafeArea(
-          crossAxisAlignment: CrossAxisAlignment.start,
+          child: SingleChildScrollView(
-          children: [
+            child: Column(
-            if (trackName != null) ...[
+              mainAxisSize: MainAxisSize.min,
-              _TrackInfoHeader(trackName: trackName, artistName: artistName, coverUrl: coverUrl),
+              crossAxisAlignment: CrossAxisAlignment.start,
-              Divider(height: 1, color: colorScheme.outlineVariant.withValues(alpha: 0.5)),
+              children: [
-            ] else ...[
+                if (trackName != null) ...[
-              const SizedBox(height: 8),
+                  _TrackInfoHeader(trackName: trackName, artistName: artistName, coverUrl: coverUrl),
-              Center(child: Container(width: 40, height: 4, decoration: BoxDecoration(color: colorScheme.onSurfaceVariant.withValues(alpha: 0.4), borderRadius: BorderRadius.circular(2)))),
+                  Divider(height: 1, color: colorScheme.outlineVariant.withValues(alpha: 0.5)),
-            ],
+                ] else ...[
-            Padding(
+                  const SizedBox(height: 8),
-              padding: const EdgeInsets.fromLTRB(24, 16, 24, 8),
+                  Center(child: Container(width: 40, height: 4, decoration: BoxDecoration(color: colorScheme.onSurfaceVariant.withValues(alpha: 0.4), borderRadius: BorderRadius.circular(2)))),
-              child: Text('Select Quality', style: Theme.of(context).textTheme.titleLarge?.copyWith(fontWeight: FontWeight.bold)),
+                ],
-            ),
+                // Service selector
-            // Disclaimer
+                Padding(
-            Padding(
+                  padding: const EdgeInsets.fromLTRB(24, 16, 24, 8),
-              padding: const EdgeInsets.fromLTRB(24, 0, 24, 12),
+                  child: Text('Download From', style: Theme.of(context).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.bold)),
-              child: Text(
-                'Actual quality depends on track availability. Hi-Res may not be available for all tracks.',
-                style: Theme.of(context).textTheme.bodySmall?.copyWith(
-                  color: colorScheme.onSurfaceVariant,
-                  fontStyle: FontStyle.italic,
                 ),
-              ),
+                Padding(
+                  padding: const EdgeInsets.symmetric(horizontal: 20),
+                  child: Row(
+                    children: [
+                      _ServiceChip(label: 'Tidal', isSelected: selectedService == 'tidal', onTap: () => setModalState(() => selectedService = 'tidal')),
+                      const SizedBox(width: 8),
+                      _ServiceChip(label: 'Qobuz', isSelected: selectedService == 'qobuz', onTap: () => setModalState(() => selectedService = 'qobuz')),
+                      const SizedBox(width: 8),
+                      _ServiceChip(label: 'Amazon', isSelected: selectedService == 'amazon', onTap: () => setModalState(() => selectedService = 'amazon')),
+                    ],
+                  ),
+                ),
+                Padding(
+                  padding: const EdgeInsets.fromLTRB(24, 16, 24, 8),
+                  child: Text('Select Quality', style: Theme.of(context).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.bold)),
+                ),
+                // Disclaimer
+                Padding(
+                  padding: const EdgeInsets.fromLTRB(24, 0, 24, 12),
+                  child: Text(
+                    'Actual quality depends on track availability. Hi-Res may not be available for all tracks.',
+                    style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                      color: colorScheme.onSurfaceVariant,
+                      fontStyle: FontStyle.italic,
+                    ),
+                  ),
+                ),
+                _QualityPickerOption(
+                  title: 'FLAC Lossless',
+                  subtitle: '16-bit / 44.1kHz',
+                  icon: Icons.music_note,
+                  onTap: () { Navigator.pop(context); onSelect('LOSSLESS', selectedService); },
+                ),
+                _QualityPickerOption(
+                  title: 'Hi-Res FLAC',
+                  subtitle: '24-bit / up to 96kHz',
+                  icon: Icons.high_quality,
+                  onTap: () { Navigator.pop(context); onSelect('HI_RES', selectedService); },
+                ),
+                _QualityPickerOption(
+                  title: 'Hi-Res FLAC Max',
+                  subtitle: '24-bit / up to 192kHz',
+                  icon: Icons.four_k,
+                  onTap: () { Navigator.pop(context); onSelect('HI_RES_LOSSLESS', selectedService); },
+                ),
+                const SizedBox(height: 16),
+              ],
             ),
-            _QualityPickerOption(
+          ),
-              title: 'FLAC Lossless',
-              subtitle: '16-bit / 44.1kHz',
-              icon: Icons.music_note,
-              onTap: () { Navigator.pop(context); onSelect('LOSSLESS'); },
-            ),
-            _QualityPickerOption(
-              title: 'Hi-Res FLAC',
-              subtitle: '24-bit / up to 96kHz',
-              icon: Icons.high_quality,
-              onTap: () { Navigator.pop(context); onSelect('HI_RES'); },
-            ),
-            _QualityPickerOption(
-              title: 'Hi-Res FLAC Max',
-              subtitle: '24-bit / up to 192kHz',
-              icon: Icons.four_k,
-              onTap: () { Navigator.pop(context); onSelect('HI_RES_LOSSLESS'); },
-            ),
-            const SizedBox(height: 16),
-          ],
         ),
       ),
     );
@@ -764,6 +791,40 @@ class _QualityPickerOption extends StatelessWidget {
   }
 }
 
+class _ServiceChip extends StatelessWidget {
+  final String label;
+  final bool isSelected;
+  final VoidCallback onTap;
+  const _ServiceChip({required this.label, required this.isSelected, required this.onTap});
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    return Expanded(
+      child: GestureDetector(
+        onTap: onTap,
+        child: AnimatedContainer(
+          duration: const Duration(milliseconds: 200),
+          padding: const EdgeInsets.symmetric(vertical: 10),
+          decoration: BoxDecoration(
+            color: isSelected ? colorScheme.primaryContainer : colorScheme.surfaceContainerHighest,
+            borderRadius: BorderRadius.circular(12),
+            border: isSelected ? null : Border.all(color: colorScheme.outlineVariant.withValues(alpha: 0.5)),
+          ),
+          child: Text(
+            label,
+            textAlign: TextAlign.center,
+            style: TextStyle(
+              fontWeight: isSelected ? FontWeight.w600 : FontWeight.normal,
+              color: isSelected ? colorScheme.onPrimaryContainer : colorScheme.onSurfaceVariant,
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+}
+
 class _TrackInfoHeader extends StatefulWidget {
   final String trackName;
   final String? artistName;

lib/screens/main_shell.dart

@@ -85,7 +85,7 @@ class _MainShellState extends ConsumerState<MainShell> {
     final settings = ref.read(settingsProvider);
     if (!settings.checkForUpdates) return;
 
-    final updateInfo = await UpdateChecker.checkForUpdate();
+    final updateInfo = await UpdateChecker.checkForUpdate(channel: settings.updateChannel);
     if (updateInfo != null && mounted) {
       showUpdateDialog(
         context,

lib/screens/playlist_screen.dart

@@ -168,8 +168,8 @@ class PlaylistScreen extends ConsumerWidget {
   void _downloadTrack(BuildContext context, WidgetRef ref, Track track) {
     final settings = ref.read(settingsProvider);
     if (settings.askQualityBeforeDownload) {
-      _showQualityPicker(context, (quality) {
+      _showQualityPicker(context, ref, (quality, service) {
-        ref.read(downloadQueueProvider.notifier).addToQueue(track, settings.defaultService, qualityOverride: quality);
+        ref.read(downloadQueueProvider.notifier).addToQueue(track, service, qualityOverride: quality);
         ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Added "${track.name}" to queue')));
       }, trackName: track.name, artistName: track.artistName, coverUrl: track.coverUrl);
     } else {
@@ -182,8 +182,8 @@ class PlaylistScreen extends ConsumerWidget {
     if (tracks.isEmpty) return;
     final settings = ref.read(settingsProvider);
     if (settings.askQualityBeforeDownload) {
-      _showQualityPicker(context, (quality) {
+      _showQualityPicker(context, ref, (quality, service) {
-        ref.read(downloadQueueProvider.notifier).addMultipleToQueue(tracks, settings.defaultService, qualityOverride: quality);
+        ref.read(downloadQueueProvider.notifier).addMultipleToQueue(tracks, service, qualityOverride: quality);
         ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Added ${tracks.length} tracks to queue')));
       }, trackName: '${tracks.length} tracks', artistName: playlistName);
     } else {
@@ -192,41 +192,66 @@ class PlaylistScreen extends ConsumerWidget {
     }
   }
 
-  void _showQualityPicker(BuildContext context, void Function(String quality) onSelect, {String? trackName, String? artistName, String? coverUrl}) {
+  void _showQualityPicker(BuildContext context, WidgetRef ref, void Function(String quality, String service) onSelect, {String? trackName, String? artistName, String? coverUrl}) {
     final colorScheme = Theme.of(context).colorScheme;
+    final settings = ref.read(settingsProvider);
+    String selectedService = settings.defaultService;
+    
     showModalBottomSheet(
       context: context,
       backgroundColor: colorScheme.surfaceContainerHigh,
       shape: const RoundedRectangleBorder(borderRadius: BorderRadius.vertical(top: Radius.circular(28))),
-      builder: (context) => SafeArea(
+      isScrollControlled: true,
-        child: Column(
+      builder: (context) => StatefulBuilder(
-          mainAxisSize: MainAxisSize.min,
+        builder: (context, setModalState) => SafeArea(
-          crossAxisAlignment: CrossAxisAlignment.start,
+          child: SingleChildScrollView(
-          children: [
+            child: Column(
-            if (trackName != null) ...[
+              mainAxisSize: MainAxisSize.min,
-              _TrackInfoHeader(trackName: trackName, artistName: artistName, coverUrl: coverUrl),
+              crossAxisAlignment: CrossAxisAlignment.start,
-              Divider(height: 1, color: colorScheme.outlineVariant.withValues(alpha: 0.5)),
+              children: [
-            ] else ...[
+                if (trackName != null) ...[
-              const SizedBox(height: 8),
+                  _TrackInfoHeader(trackName: trackName, artistName: artistName, coverUrl: coverUrl),
-              Center(child: Container(width: 40, height: 4, decoration: BoxDecoration(color: colorScheme.onSurfaceVariant.withValues(alpha: 0.4), borderRadius: BorderRadius.circular(2)))),
+                  Divider(height: 1, color: colorScheme.outlineVariant.withValues(alpha: 0.5)),
-            ],
+                ] else ...[
-            Padding(padding: const EdgeInsets.fromLTRB(24, 16, 24, 8), child: Text('Select Quality', style: Theme.of(context).textTheme.titleLarge?.copyWith(fontWeight: FontWeight.bold))),
+                  const SizedBox(height: 8),
-            // Disclaimer
+                  Center(child: Container(width: 40, height: 4, decoration: BoxDecoration(color: colorScheme.onSurfaceVariant.withValues(alpha: 0.4), borderRadius: BorderRadius.circular(2)))),
-            Padding(
+                ],
-              padding: const EdgeInsets.fromLTRB(24, 0, 24, 12),
+                // Service selector
-              child: Text(
+                Padding(
-                'Actual quality depends on track availability. Hi-Res may not be available for all tracks.',
+                  padding: const EdgeInsets.fromLTRB(24, 16, 24, 8),
-                style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                  child: Text('Download From', style: Theme.of(context).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.bold)),
-                  color: colorScheme.onSurfaceVariant,
-                  fontStyle: FontStyle.italic,
                 ),
-              ),
+                Padding(
+                  padding: const EdgeInsets.symmetric(horizontal: 20),
+                  child: Row(
+                    children: [
+                      _ServiceChip(label: 'Tidal', isSelected: selectedService == 'tidal', onTap: () => setModalState(() => selectedService = 'tidal')),
+                      const SizedBox(width: 8),
+                      _ServiceChip(label: 'Qobuz', isSelected: selectedService == 'qobuz', onTap: () => setModalState(() => selectedService = 'qobuz')),
+                      const SizedBox(width: 8),
+                      _ServiceChip(label: 'Amazon', isSelected: selectedService == 'amazon', onTap: () => setModalState(() => selectedService = 'amazon')),
+                    ],
+                  ),
+                ),
+                Padding(padding: const EdgeInsets.fromLTRB(24, 16, 24, 8), child: Text('Select Quality', style: Theme.of(context).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.bold))),
+                // Disclaimer
+                Padding(
+                  padding: const EdgeInsets.fromLTRB(24, 0, 24, 12),
+                  child: Text(
+                    'Actual quality depends on track availability. Hi-Res may not be available for all tracks.',
+                    style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                      color: colorScheme.onSurfaceVariant,
+                      fontStyle: FontStyle.italic,
+                    ),
+                  ),
+                ),
+                _QualityOption(title: 'FLAC Lossless', subtitle: '16-bit / 44.1kHz', icon: Icons.music_note, onTap: () { Navigator.pop(context); onSelect('LOSSLESS', selectedService); }),
+                _QualityOption(title: 'Hi-Res FLAC', subtitle: '24-bit / up to 96kHz', icon: Icons.high_quality, onTap: () { Navigator.pop(context); onSelect('HI_RES', selectedService); }),
+                _QualityOption(title: 'Hi-Res FLAC Max', subtitle: '24-bit / up to 192kHz', icon: Icons.four_k, onTap: () { Navigator.pop(context); onSelect('HI_RES_LOSSLESS', selectedService); }),
+                const SizedBox(height: 16),
+              ],
             ),
-            _QualityOption(title: 'FLAC Lossless', subtitle: '16-bit / 44.1kHz', icon: Icons.music_note, onTap: () { Navigator.pop(context); onSelect('LOSSLESS'); }),
+          ),
-            _QualityOption(title: 'Hi-Res FLAC', subtitle: '24-bit / up to 96kHz', icon: Icons.high_quality, onTap: () { Navigator.pop(context); onSelect('HI_RES'); }),
-            _QualityOption(title: 'Hi-Res FLAC Max', subtitle: '24-bit / up to 192kHz', icon: Icons.four_k, onTap: () { Navigator.pop(context); onSelect('HI_RES_LOSSLESS'); }),
-            const SizedBox(height: 16),
-          ],
         ),
       ),
     );
@@ -254,6 +279,40 @@ class _QualityOption extends StatelessWidget {
   }
 }
 
+class _ServiceChip extends StatelessWidget {
+  final String label;
+  final bool isSelected;
+  final VoidCallback onTap;
+  const _ServiceChip({required this.label, required this.isSelected, required this.onTap});
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    return Expanded(
+      child: GestureDetector(
+        onTap: onTap,
+        child: AnimatedContainer(
+          duration: const Duration(milliseconds: 200),
+          padding: const EdgeInsets.symmetric(vertical: 10),
+          decoration: BoxDecoration(
+            color: isSelected ? colorScheme.primaryContainer : colorScheme.surfaceContainerHighest,
+            borderRadius: BorderRadius.circular(12),
+            border: isSelected ? null : Border.all(color: colorScheme.outlineVariant.withValues(alpha: 0.5)),
+          ),
+          child: Text(
+            label,
+            textAlign: TextAlign.center,
+            style: TextStyle(
+              fontWeight: isSelected ? FontWeight.w600 : FontWeight.normal,
+              color: isSelected ? colorScheme.onPrimaryContainer : colorScheme.onSurfaceVariant,
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+}
+
 class _TrackInfoHeader extends StatefulWidget {
   final String trackName;
   final String? artistName;

lib/screens/search_screen.dart

@@ -23,7 +23,8 @@ class _SearchScreenState extends ConsumerState<SearchScreen> {
     _searchController = TextEditingController(text: widget.query);
     if (widget.query.isNotEmpty) {
       WidgetsBinding.instance.addPostFrameCallback((_) {
-        ref.read(trackProvider.notifier).search(widget.query);
+        final settings = ref.read(settingsProvider);
+        ref.read(trackProvider.notifier).search(widget.query, metadataSource: settings.metadataSource);
       });
     }
   }
@@ -37,7 +38,8 @@ class _SearchScreenState extends ConsumerState<SearchScreen> {
   void _search() {
     final query = _searchController.text.trim();
     if (query.isNotEmpty) {
-      ref.read(trackProvider.notifier).search(query);
+      final settings = ref.read(settingsProvider);
+      ref.read(trackProvider.notifier).search(query, metadataSource: settings.metadataSource);
     }
   }
 

lib/screens/settings/about_page.dart

@@ -123,6 +123,24 @@ class AboutPage extends StatelessWidget {
             ),
           ),
 
+          // Support section
+          const SliverToBoxAdapter(
+            child: SettingsSectionHeader(title: 'Support'),
+          ),
+          SliverToBoxAdapter(
+            child: SettingsGroup(
+              children: [
+                SettingsItem(
+                  icon: Icons.coffee_outlined,
+                  title: 'Buy me a coffee',
+                  subtitle: 'Support development on Ko-fi',
+                  onTap: () => _launchUrl(AppInfo.kofiUrl),
+                  showDivider: false,
+                ),
+              ],
+            ),
+          ),
+
           // App info section
           const SliverToBoxAdapter(
             child: SettingsSectionHeader(title: 'App'),

lib/screens/settings/appearance_settings_page.dart

@@ -40,6 +40,14 @@ class AppearanceSettingsPage extends ConsumerWidget {
                     currentMode: themeSettings.themeMode,
                     onChanged: (mode) => ref.read(themeProvider.notifier).setThemeMode(mode),
                   ),
+                  SettingsSwitchItem(
+                    icon: Icons.brightness_2,
+                    title: 'AMOLED Dark',
+                    subtitle: 'Pure black background for OLED screens',
+                    value: themeSettings.useAmoled,
+                    onChanged: (value) => ref.read(themeProvider.notifier).setUseAmoled(value),
+                    showDivider: false,
+                  ),
                 ],
               ),
             ),

lib/screens/settings/download_settings_page.dart

@@ -1,6 +1,8 @@
+import 'dart:io';
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:file_picker/file_picker.dart';
+import 'package:path_provider/path_provider.dart';
 import 'package:spotiflac_android/providers/settings_provider.dart';
 import 'package:spotiflac_android/widgets/settings_group.dart';
 
@@ -113,8 +115,10 @@ class DownloadSettingsPage extends ConsumerWidget {
                 SettingsItem(
                   icon: Icons.folder_outlined,
                   title: 'Download Directory',
-                  subtitle: settings.downloadDirectory.isEmpty ? 'Music/SpotiFLAC' : settings.downloadDirectory,
+                  subtitle: settings.downloadDirectory.isEmpty 
-                  onTap: () => _pickDirectory(ref),
+                      ? (Platform.isIOS ? 'App Documents Folder' : 'Music/SpotiFLAC') 
+                      : settings.downloadDirectory,
+                  onTap: () => _pickDirectory(context, ref),
                 ),
                 SettingsItem(
                   icon: Icons.create_new_folder_outlined,
@@ -161,9 +165,90 @@ class DownloadSettingsPage extends ConsumerWidget {
     );
   }
 
-  Future<void> _pickDirectory(WidgetRef ref) async {
+  Future<void> _pickDirectory(BuildContext context, WidgetRef ref) async {
-    final result = await FilePicker.platform.getDirectoryPath();
+    if (Platform.isIOS) {
-    if (result != null) ref.read(settingsProvider.notifier).setDownloadDirectory(result);
+      // iOS: Show options dialog
+      _showIOSDirectoryOptions(context, ref);
+    } else {
+      // Android: Use file picker
+      final result = await FilePicker.platform.getDirectoryPath();
+      if (result != null) ref.read(settingsProvider.notifier).setDownloadDirectory(result);
+    }
+  }
+
+  void _showIOSDirectoryOptions(BuildContext context, WidgetRef ref) {
+    final colorScheme = Theme.of(context).colorScheme;
+    showModalBottomSheet(
+      context: context,
+      backgroundColor: colorScheme.surfaceContainerHigh,
+      shape: const RoundedRectangleBorder(borderRadius: BorderRadius.vertical(top: Radius.circular(28))),
+      builder: (ctx) => SafeArea(
+        child: Column(
+          mainAxisSize: MainAxisSize.min,
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: [
+            Padding(
+              padding: const EdgeInsets.fromLTRB(24, 24, 24, 8),
+              child: Text('Download Location', style: Theme.of(context).textTheme.titleLarge?.copyWith(fontWeight: FontWeight.bold)),
+            ),
+            Padding(
+              padding: const EdgeInsets.fromLTRB(24, 0, 24, 16),
+              child: Text(
+                'On iOS, downloads are saved to the app\'s Documents folder which is accessible via the Files app.',
+                style: Theme.of(context).textTheme.bodyMedium?.copyWith(color: colorScheme.onSurfaceVariant),
+              ),
+            ),
+            ListTile(
+              leading: Icon(Icons.folder_special, color: colorScheme.primary),
+              title: const Text('App Documents Folder'),
+              subtitle: const Text('Recommended - accessible via Files app'),
+              trailing: Icon(Icons.check_circle, color: colorScheme.primary),
+              onTap: () async {
+                final dir = await getApplicationDocumentsDirectory();
+                ref.read(settingsProvider.notifier).setDownloadDirectory(dir.path);
+                if (ctx.mounted) Navigator.pop(ctx);
+              },
+            ),
+            ListTile(
+              leading: Icon(Icons.cloud, color: colorScheme.onSurfaceVariant),
+              title: const Text('Choose from Files'),
+              subtitle: const Text('Select iCloud or other location'),
+              onTap: () async {
+                Navigator.pop(ctx);
+                // Note: iOS requires folder to have at least one file to be selectable
+                final result = await FilePicker.platform.getDirectoryPath();
+                if (result != null) {
+                  ref.read(settingsProvider.notifier).setDownloadDirectory(result);
+                }
+              },
+            ),
+            Padding(
+              padding: const EdgeInsets.fromLTRB(24, 8, 24, 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(
+                        'iOS limitation: Empty folders cannot be selected. Create a file inside first or use App Documents.',
+                        style: Theme.of(context).textTheme.bodySmall?.copyWith(color: colorScheme.onTertiaryContainer),
+                      ),
+                    ),
+                  ],
+                ),
+              ),
+            ),
+            const SizedBox(height: 8),
+          ],
+        ),
+      ),
+    );
   }
 
   String _getFolderOrganizationLabel(String value) {

lib/screens/settings/options_settings_page.dart

@@ -105,7 +105,10 @@ class OptionsSettingsPage extends ConsumerWidget {
                   subtitle: 'Notify when new version is available',
                   value: settings.checkForUpdates,
                   onChanged: (v) => ref.read(settingsProvider.notifier).setCheckForUpdates(v),
-                  showDivider: false,
+                ),
+                _UpdateChannelSelector(
+                  currentChannel: settings.updateChannel,
+                  onChanged: (v) => ref.read(settingsProvider.notifier).setUpdateChannel(v),
                 ),
               ],
             ),
@@ -116,29 +119,35 @@ class OptionsSettingsPage extends ConsumerWidget {
           SliverToBoxAdapter(
             child: SettingsGroup(
               children: [
-                SettingsItem(
+                _MetadataSourceSelector(
-                  icon: Icons.key,
+                  currentSource: settings.metadataSource,
-                  title: 'Custom Credentials',
+                  onChanged: (v) => ref.read(settingsProvider.notifier).setMetadataSource(v),
-                  subtitle: settings.spotifyClientId.isNotEmpty 
-                      ? 'Client ID: ${settings.spotifyClientId.length > 8 ? '${settings.spotifyClientId.substring(0, 8)}...' : settings.spotifyClientId}' 
-                      : 'Not configured',
-                  onTap: () => _showSpotifyCredentialsDialog(context, ref, settings),
-                  trailing: settings.spotifyClientId.isNotEmpty
-                      ? Icon(Icons.edit, color: Theme.of(context).colorScheme.onSurfaceVariant, size: 20)
-                      : Icon(Icons.add, color: Theme.of(context).colorScheme.primary, size: 20),
-                  showDivider: settings.spotifyClientId.isNotEmpty,
                 ),
-                if (settings.spotifyClientId.isNotEmpty)
+                if (settings.metadataSource == 'spotify') ...[
-                  SettingsSwitchItem(
+                  SettingsItem(
-                    icon: Icons.toggle_on,
+                    icon: Icons.key,
-                    title: 'Use Custom Credentials',
+                    title: 'Custom Credentials',
-                    subtitle: settings.useCustomSpotifyCredentials 
+                    subtitle: settings.spotifyClientId.isNotEmpty 
-                        ? 'Using your credentials' 
+                        ? 'Client ID: ${settings.spotifyClientId.length > 8 ? '${settings.spotifyClientId.substring(0, 8)}...' : settings.spotifyClientId}' 
-                        : 'Using default credentials',
+                        : 'Not configured',
-                    value: settings.useCustomSpotifyCredentials,
+                    onTap: () => _showSpotifyCredentialsDialog(context, ref, settings),
-                    onChanged: (v) => ref.read(settingsProvider.notifier).setUseCustomSpotifyCredentials(v),
+                    trailing: settings.spotifyClientId.isNotEmpty
-                    showDivider: false,
+                        ? Icon(Icons.edit, color: Theme.of(context).colorScheme.onSurfaceVariant, size: 20)
+                        : Icon(Icons.add, color: Theme.of(context).colorScheme.primary, size: 20),
+                    showDivider: settings.spotifyClientId.isNotEmpty,
                   ),
+                  if (settings.spotifyClientId.isNotEmpty)
+                    SettingsSwitchItem(
+                      icon: Icons.toggle_on,
+                      title: 'Use Custom Credentials',
+                      subtitle: settings.useCustomSpotifyCredentials 
+                          ? 'Using your credentials' 
+                          : 'Using default credentials',
+                      value: settings.useCustomSpotifyCredentials,
+                      onChanged: (v) => ref.read(settingsProvider.notifier).setUseCustomSpotifyCredentials(v),
+                      showDivider: false,
+                    ),
+                ],
               ],
             ),
           ),
@@ -393,3 +402,149 @@ class _ConcurrentChip extends StatelessWidget {
     );
   }
 }
+
+class _UpdateChannelSelector extends StatelessWidget {
+  final String currentChannel;
+  final ValueChanged<String> onChanged;
+  const _UpdateChannelSelector({required this.currentChannel, required this.onChanged});
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    return Padding(
+      padding: const EdgeInsets.all(20),
+      child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
+        Row(children: [
+          Icon(Icons.new_releases, color: colorScheme.onSurfaceVariant, size: 24),
+          const SizedBox(width: 16),
+          Expanded(child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
+            Text('Update Channel', style: Theme.of(context).textTheme.bodyLarge),
+            const SizedBox(height: 2),
+            Text(currentChannel == 'preview' ? 'Get preview releases' : 'Stable releases only',
+              style: Theme.of(context).textTheme.bodyMedium?.copyWith(color: colorScheme.onSurfaceVariant)),
+          ])),
+        ]),
+        const SizedBox(height: 16),
+        Row(children: [
+          _ChannelChip(label: 'Stable', isSelected: currentChannel == 'stable', onTap: () => onChanged('stable')),
+          const SizedBox(width: 8),
+          _ChannelChip(label: 'Preview', isSelected: currentChannel == 'preview', onTap: () => onChanged('preview')),
+        ]),
+        const SizedBox(height: 12),
+        Row(children: [
+          Icon(Icons.info_outline, size: 16, color: colorScheme.onSurfaceVariant),
+          const SizedBox(width: 8),
+          Expanded(child: Text('Preview may contain bugs or incomplete features',
+            style: Theme.of(context).textTheme.bodySmall?.copyWith(color: colorScheme.onSurfaceVariant))),
+        ]),
+      ]),
+    );
+  }
+}
+
+class _ChannelChip extends StatelessWidget {
+  final String label;
+  final bool isSelected;
+  final VoidCallback onTap;
+  const _ChannelChip({required this.label, required this.isSelected, required this.onTap});
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    final isDark = Theme.of(context).brightness == Brightness.dark;
+    
+    final unselectedColor = isDark 
+        ? Color.alphaBlend(Colors.white.withValues(alpha: 0.05), colorScheme.surface)
+        : colorScheme.surfaceContainerHigh;
+    
+    return Expanded(
+      child: Material(
+        color: isSelected ? colorScheme.primaryContainer : unselectedColor,
+        borderRadius: BorderRadius.circular(12),
+        child: InkWell(
+          onTap: onTap,
+          borderRadius: BorderRadius.circular(12),
+          child: Padding(
+            padding: const EdgeInsets.symmetric(vertical: 12),
+            child: Center(child: Text(label, style: TextStyle(
+              fontWeight: isSelected ? FontWeight.w600 : FontWeight.normal,
+              color: isSelected ? colorScheme.onPrimaryContainer : colorScheme.onSurfaceVariant))),
+          ),
+        ),
+      ),
+    );
+  }
+}
+
+class _MetadataSourceSelector extends StatelessWidget {
+  final String currentSource;
+  final ValueChanged<String> onChanged;
+  const _MetadataSourceSelector({required this.currentSource, required this.onChanged});
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    return Padding(
+      padding: const EdgeInsets.all(20),
+      child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
+        Row(children: [
+          Icon(Icons.search, color: colorScheme.onSurfaceVariant, size: 24),
+          const SizedBox(width: 16),
+          Expanded(child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
+            Text('Search Source', style: Theme.of(context).textTheme.bodyLarge),
+            const SizedBox(height: 2),
+            Text(currentSource == 'deezer' ? 'Deezer (no need developer account)' : 'Spotify (may hit rate limit)',
+              style: Theme.of(context).textTheme.bodyMedium?.copyWith(color: colorScheme.onSurfaceVariant)),
+          ])),
+        ]),
+        const SizedBox(height: 16),
+        Row(children: [
+          _SourceChip(label: 'Deezer', isSelected: currentSource == 'deezer', onTap: () => onChanged('deezer')),
+          const SizedBox(width: 8),
+          _SourceChip(label: 'Spotify', isSelected: currentSource == 'spotify', onTap: () => onChanged('spotify')),
+        ]),
+        const SizedBox(height: 12),
+        Row(children: [
+          Icon(Icons.info_outline, size: 16, color: colorScheme.onSurfaceVariant),
+          const SizedBox(width: 8),
+          Expanded(child: Text('Spotify URLs are always supported regardless of this setting',
+            style: Theme.of(context).textTheme.bodySmall?.copyWith(color: colorScheme.onSurfaceVariant))),
+        ]),
+      ]),
+    );
+  }
+}
+
+class _SourceChip extends StatelessWidget {
+  final String label;
+  final bool isSelected;
+  final VoidCallback onTap;
+  const _SourceChip({required this.label, required this.isSelected, required this.onTap});
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    final isDark = Theme.of(context).brightness == Brightness.dark;
+    
+    final unselectedColor = isDark 
+        ? Color.alphaBlend(Colors.white.withValues(alpha: 0.05), colorScheme.surface)
+        : colorScheme.surfaceContainerHigh;
+    
+    return Expanded(
+      child: Material(
+        color: isSelected ? colorScheme.primaryContainer : unselectedColor,
+        borderRadius: BorderRadius.circular(12),
+        child: InkWell(
+          onTap: onTap,
+          borderRadius: BorderRadius.circular(12),
+          child: Padding(
+            padding: const EdgeInsets.symmetric(vertical: 12),
+            child: Center(child: Text(label, style: TextStyle(
+              fontWeight: isSelected ? FontWeight.w600 : FontWeight.normal,
+              color: isSelected ? colorScheme.onPrimaryContainer : colorScheme.onSurfaceVariant))),
+          ),
+        ),
+      ),
+    );
+  }
+}

lib/screens/setup_screen.dart

@@ -205,29 +205,35 @@ class _SetupScreenState extends ConsumerState<SetupScreen> {
     setState(() => _isLoading = true);
 
     try {
-      String? selectedDirectory = await FilePicker.platform.getDirectoryPath(
+      if (Platform.isIOS) {
-        dialogTitle: 'Select Download Folder',
+        // iOS: Show options dialog
-      );
+        await _showIOSDirectoryOptions();
-
-      if (selectedDirectory != null) {
-        setState(() => _selectedDirectory = selectedDirectory);
       } else {
-        final defaultDir = await _getDefaultDirectory();
+        // Android: Use file picker
-        if (mounted) {
+        String? selectedDirectory = await FilePicker.platform.getDirectoryPath(
-          final useDefault = await showDialog<bool>(
+          dialogTitle: 'Select Download Folder',
-            context: context,
+        );
-            builder: (context) => AlertDialog(
-              title: const Text('Use Default Folder?'),
-              content: Text('No folder selected. Would you like to use the default Music folder?\n\n$defaultDir'),
-              actions: [
-                TextButton(onPressed: () => Navigator.pop(context, false), child: const Text('Cancel')),
-                TextButton(onPressed: () => Navigator.pop(context, true), child: const Text('Use Default')),
-              ],
-            ),
-          );
 
-          if (useDefault == true) {
+        if (selectedDirectory != null) {
-            setState(() => _selectedDirectory = defaultDir);
+          setState(() => _selectedDirectory = selectedDirectory);
+        } else {
+          final defaultDir = await _getDefaultDirectory();
+          if (mounted) {
+            final useDefault = await showDialog<bool>(
+              context: context,
+              builder: (context) => AlertDialog(
+                title: const Text('Use Default Folder?'),
+                content: Text('No folder selected. Would you like to use the default Music folder?\n\n$defaultDir'),
+                actions: [
+                  TextButton(onPressed: () => Navigator.pop(context, false), child: const Text('Cancel')),
+                  TextButton(onPressed: () => Navigator.pop(context, true), child: const Text('Use Default')),
+                ],
+              ),
+            );
+
+            if (useDefault == true) {
+              setState(() => _selectedDirectory = defaultDir);
+            }
           }
         }
       }
@@ -236,6 +242,82 @@ class _SetupScreenState extends ConsumerState<SetupScreen> {
     }
   }
 
+  Future<void> _showIOSDirectoryOptions() async {
+    final colorScheme = Theme.of(context).colorScheme;
+    
+    await showModalBottomSheet(
+      context: context,
+      backgroundColor: colorScheme.surfaceContainerHigh,
+      shape: const RoundedRectangleBorder(borderRadius: BorderRadius.vertical(top: Radius.circular(28))),
+      builder: (ctx) => SafeArea(
+        child: Column(
+          mainAxisSize: MainAxisSize.min,
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: [
+            Padding(
+              padding: const EdgeInsets.fromLTRB(24, 24, 24, 8),
+              child: Text('Download Location', style: Theme.of(context).textTheme.titleLarge?.copyWith(fontWeight: FontWeight.bold)),
+            ),
+            Padding(
+              padding: const EdgeInsets.fromLTRB(24, 0, 24, 16),
+              child: Text(
+                'On iOS, downloads are saved to the app\'s Documents folder which is accessible via the Files app.',
+                style: Theme.of(context).textTheme.bodyMedium?.copyWith(color: colorScheme.onSurfaceVariant),
+              ),
+            ),
+            ListTile(
+              leading: Icon(Icons.folder_special, color: colorScheme.primary),
+              title: const Text('App Documents Folder'),
+              subtitle: const Text('Recommended - accessible via Files app'),
+              trailing: Icon(Icons.check_circle, color: colorScheme.primary),
+              onTap: () async {
+                final dir = await _getDefaultDirectory();
+                setState(() => _selectedDirectory = dir);
+                if (ctx.mounted) Navigator.pop(ctx);
+              },
+            ),
+            ListTile(
+              leading: Icon(Icons.cloud, color: colorScheme.onSurfaceVariant),
+              title: const Text('Choose from Files'),
+              subtitle: const Text('Select iCloud or other location'),
+              onTap: () async {
+                Navigator.pop(ctx);
+                // Note: iOS requires folder to have at least one file to be selectable
+                final result = await FilePicker.platform.getDirectoryPath();
+                if (result != null) {
+                  setState(() => _selectedDirectory = result);
+                }
+              },
+            ),
+            Padding(
+              padding: const EdgeInsets.fromLTRB(24, 8, 24, 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(
+                        'iOS limitation: Empty folders cannot be selected. Create a file inside first or use App Documents.',
+                        style: Theme.of(context).textTheme.bodySmall?.copyWith(color: colorScheme.onTertiaryContainer),
+                      ),
+                    ),
+                  ],
+                ),
+              ),
+            ),
+            const SizedBox(height: 8),
+          ],
+        ),
+      ),
+    );
+  }
+
   Future<String> _getDefaultDirectory() async {
     if (Platform.isIOS) {
       final appDir = await getApplicationDocumentsDirectory();

lib/screens/track_metadata_screen.dart

@@ -759,17 +759,21 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
     });
 
     try {
+      // Add timeout to prevent infinite loading
       final result = await PlatformBridge.getLyricsLRC(
         item.spotifyId ?? '',
         item.trackName,
         item.artistName,
         filePath: _fileExists ? item.filePath : null, // Try embedded lyrics first
+      ).timeout(
+        const Duration(seconds: 20),
+        onTimeout: () => '', // Return empty string on timeout
       );
       
       if (mounted) {
         if (result.isEmpty) {
           setState(() {
-            _lyricsError = 'Lyrics not found';
+            _lyricsError = 'Lyrics not available for this track';
             _lyricsLoading = false;
           });
         } else {
@@ -783,8 +787,11 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
       }
     } catch (e) {
       if (mounted) {
+        final errorMsg = e.toString().contains('TimeoutException') 
+            ? 'Request timed out. Try again later.'
+            : 'Failed to load lyrics';
         setState(() {
-          _lyricsError = 'Failed to load lyrics';
+          _lyricsError = errorMsg;
           _lyricsLoading = false;
         });
       }

lib/services/ffmpeg_service.dart

@@ -1,12 +1,30 @@
 import 'dart:io';
-import 'package:ffmpeg_kit_flutter_new_audio/ffmpeg_kit.dart';
+import 'package:flutter/services.dart';
-import 'package:ffmpeg_kit_flutter_new_audio/return_code.dart';
 import 'package:spotiflac_android/utils/logger.dart';
 
 final _log = AppLogger('FFmpeg');
 
 /// FFmpeg service for audio conversion and remuxing
+/// Uses native MethodChannel to call FFmpegKit from local AAR
 class FFmpegService {
+  static const _channel = MethodChannel('com.zarz.spotiflac/ffmpeg');
+
+  /// Execute FFmpeg command and return result
+  static Future<FFmpegResult> _execute(String command) async {
+    try {
+      final result = await _channel.invokeMethod('execute', {'command': command});
+      final map = Map<String, dynamic>.from(result);
+      return FFmpegResult(
+        success: map['success'] as bool,
+        returnCode: map['returnCode'] as int,
+        output: map['output'] as String,
+      );
+    } catch (e) {
+      _log.e('FFmpeg execute error: $e');
+      return FFmpegResult(success: false, returnCode: -1, output: e.toString());
+    }
+  }
+
   /// Convert M4A (DASH segments) to FLAC
   /// Returns the output file path on success, null on failure
   static Future<String?> convertM4aToFlac(String inputPath) async {
@@ -16,10 +34,9 @@ class FFmpegService {
     final command =
         '-i "$inputPath" -c:a flac -compression_level 8 "$outputPath" -y';
 
-    final session = await FFmpegKit.execute(command);
+    final result = await _execute(command);
-    final returnCode = await session.getReturnCode();
 
-    if (ReturnCode.isSuccess(returnCode)) {
+    if (result.success) {
       // Delete original M4A file
       try {
         await File(inputPath).delete();
@@ -27,12 +44,7 @@ class FFmpegService {
       return outputPath;
     }
 
-    // Log error for debugging
+    _log.e('M4A to FLAC conversion failed: ${result.output}');
-    final logs = await session.getLogs();
-    for (final log in logs) {
-      _log.d(log.getMessage());
-    }
-
     return null;
   }
 
@@ -54,13 +66,13 @@ class FFmpegService {
     final command =
         '-i "$inputPath" -codec:a libmp3lame -b:a $bitrate -map 0:a -map_metadata 0 -id3v2_version 3 "$outputPath" -y';
 
-    final session = await FFmpegKit.execute(command);
+    final result = await _execute(command);
-    final returnCode = await session.getReturnCode();
 
-    if (ReturnCode.isSuccess(returnCode)) {
+    if (result.success) {
       return outputPath;
     }
 
+    _log.e('FLAC to MP3 conversion failed: ${result.output}');
     return null;
   }
 
@@ -91,22 +103,21 @@ class FFmpegService {
           '-i "$inputPath" -codec:a aac -b:a $bitrate -map 0:a -map_metadata 0 "$outputPath" -y';
     }
 
-    final session = await FFmpegKit.execute(command);
+    final result = await _execute(command);
-    final returnCode = await session.getReturnCode();
 
-    if (ReturnCode.isSuccess(returnCode)) {
+    if (result.success) {
       return outputPath;
     }
 
+    _log.e('FLAC to M4A conversion failed: ${result.output}');
     return null;
   }
 
   /// Check if FFmpeg is available
   static Future<bool> isAvailable() async {
     try {
-      final session = await FFmpegKit.execute('-version');
+      final version = await _channel.invokeMethod('getVersion');
-      final returnCode = await session.getReturnCode();
+      return version != null && version.toString().isNotEmpty;
-      return ReturnCode.isSuccess(returnCode);
     } catch (e) {
       return false;
     }
@@ -115,11 +126,55 @@ class FFmpegService {
   /// Get FFmpeg version info
   static Future<String?> getVersion() async {
     try {
-      final session = await FFmpegKit.execute('-version');
+      final version = await _channel.invokeMethod('getVersion');
-      final output = await session.getOutput();
+      return version as String?;
-      return output;
     } catch (e) {
       return null;
     }
   }
+
+  /// Embed cover art to FLAC file
+  /// Returns the file path on success, null on failure
+  static Future<String?> embedCover(String flacPath, String coverPath) async {
+    final tempOutput = '$flacPath.tmp';
+    final command = '-i "$flacPath" -i "$coverPath" -map 0:a -map 1:0 -c copy -metadata:s:v title="Album cover" -metadata:s:v comment="Cover (front)" -disposition:v attached_pic "$tempOutput" -y';
+
+    final result = await _execute(command);
+
+    if (result.success) {
+      try {
+        // Replace original with temp
+        await File(flacPath).delete();
+        await File(tempOutput).rename(flacPath);
+        return flacPath;
+      } catch (e) {
+        _log.e('Failed to replace file after cover embed: $e');
+        return null;
+      }
+    }
+
+    // Clean up temp file if exists
+    try {
+      final tempFile = File(tempOutput);
+      if (await tempFile.exists()) {
+        await tempFile.delete();
+      }
+    } catch (_) {}
+
+    _log.e('Cover embed failed: ${result.output}');
+    return null;
+  }
+}
+
+/// Result of FFmpeg command execution
+class FFmpegResult {
+  final bool success;
+  final int returnCode;
+  final String output;
+
+  FFmpegResult({
+    required this.success,
+    required this.returnCode,
+    required this.output,
+  });
 }

lib/services/platform_bridge.dart

@@ -111,7 +111,7 @@ class PlatformBridge {
     int discNumber = 1,
     int totalTracks = 1,
     String? releaseDate,
-    String preferredService = 'tidal',
+    String preferredService = 'qobuz',
     String? itemId,
     int durationMs = 0,
   }) async {
@@ -297,4 +297,71 @@ class PlatformBridge {
       'client_secret': clientSecret,
     });
   }
+
+  /// Pre-warm track ID cache for album/playlist tracks
+  /// This runs in background and returns immediately
+  /// Speeds up subsequent downloads by caching ISRC → Track ID mappings
+  static Future<void> preWarmTrackCache(List<Map<String, String>> tracks) async {
+    final tracksJson = jsonEncode(tracks);
+    await _channel.invokeMethod('preWarmTrackCache', {'tracks': tracksJson});
+  }
+
+  /// Get current track cache size
+  static Future<int> getTrackCacheSize() async {
+    final result = await _channel.invokeMethod('getTrackCacheSize');
+    return result as int;
+  }
+
+  /// Clear track ID cache
+  static Future<void> clearTrackCache() async {
+    await _channel.invokeMethod('clearTrackCache');
+  }
+
+  // ==================== DEEZER API ====================
+
+  /// Search Deezer for tracks and artists (no API key required)
+  static Future<Map<String, dynamic>> searchDeezerAll(String query, {int trackLimit = 15, int artistLimit = 3}) async {
+    final result = await _channel.invokeMethod('searchDeezerAll', {
+      'query': query,
+      'track_limit': trackLimit,
+      'artist_limit': artistLimit,
+    });
+    return jsonDecode(result as String) as Map<String, dynamic>;
+  }
+
+  /// Get Deezer metadata by type and ID
+  static Future<Map<String, dynamic>> getDeezerMetadata(String resourceType, String resourceId) async {
+    final result = await _channel.invokeMethod('getDeezerMetadata', {
+      'resource_type': resourceType,
+      'resource_id': resourceId,
+    });
+    return jsonDecode(result as String) as Map<String, dynamic>;
+  }
+
+  /// Parse Deezer URL and return type and ID
+  static Future<Map<String, dynamic>> parseDeezerUrl(String url) async {
+    final result = await _channel.invokeMethod('parseDeezerUrl', {'url': url});
+    return jsonDecode(result as String) as Map<String, dynamic>;
+  }
+
+  /// Search Deezer by ISRC
+  static Future<Map<String, dynamic>> searchDeezerByISRC(String isrc) async {
+    final result = await _channel.invokeMethod('searchDeezerByISRC', {'isrc': isrc});
+    return jsonDecode(result as String) as Map<String, dynamic>;
+  }
+
+  /// Convert Spotify track to Deezer and get metadata (for rate limit fallback)
+  static Future<Map<String, dynamic>> convertSpotifyToDeezer(String resourceType, String spotifyId) async {
+    final result = await _channel.invokeMethod('convertSpotifyToDeezer', {
+      'resource_type': resourceType,
+      'spotify_id': spotifyId,
+    });
+    return jsonDecode(result as String) as Map<String, dynamic>;
+  }
+
+  /// Get Spotify metadata with automatic Deezer fallback on rate limit
+  static Future<Map<String, dynamic>> getSpotifyMetadataWithFallback(String url) async {
+    final result = await _channel.invokeMethod('getSpotifyMetadataWithFallback', {'url': url});
+    return jsonDecode(result as String) as Map<String, dynamic>;
+  }
 }

lib/services/update_checker.dart

@@ -12,6 +12,7 @@ class UpdateInfo {
   final String downloadUrl;
   final String? apkDownloadUrl;
   final DateTime publishedAt;
+  final bool isPrerelease;
 
   const UpdateInfo({
     required this.version,
@@ -19,11 +20,13 @@ class UpdateInfo {
     required this.downloadUrl,
     this.apkDownloadUrl,
     required this.publishedAt,
+    this.isPrerelease = false,
   });
 }
 
 class UpdateChecker {
-  static const String _apiUrl = 'https://api.github.com/repos/${AppInfo.githubRepo}/releases/latest';
+  static const String _latestApiUrl = 'https://api.github.com/repos/${AppInfo.githubRepo}/releases/latest';
+  static const String _allReleasesApiUrl = 'https://api.github.com/repos/${AppInfo.githubRepo}/releases';
 
   static Future<String> _getDeviceArch() async {
     if (!Platform.isAndroid) return 'unknown';
@@ -55,30 +58,59 @@ class UpdateChecker {
     }
   }
 
-  static Future<UpdateInfo?> checkForUpdate() async {
+  /// Check for updates based on channel preference
+  /// [channel] can be 'stable' or 'preview'
+  static Future<UpdateInfo?> checkForUpdate({String channel = 'stable'}) async {
     try {
-      final response = await http.get(
+      Map<String, dynamic>? releaseData;
-        Uri.parse(_apiUrl),
+      
-        headers: {'Accept': 'application/vnd.github.v3+json'},
+      if (channel == 'preview') {
-      ).timeout(const Duration(seconds: 10));
+        // For preview channel, get all releases and find the latest (including prereleases)
+        final response = await http.get(
+          Uri.parse('$_allReleasesApiUrl?per_page=10'),
+          headers: {'Accept': 'application/vnd.github.v3+json'},
+        ).timeout(const Duration(seconds: 10));
 
-      if (response.statusCode != 200) {
+        if (response.statusCode != 200) {
-        _log.w('GitHub API returned ${response.statusCode}');
+          _log.w('GitHub API returned ${response.statusCode}');
-        return null;
+          return null;
+        }
+
+        final releases = jsonDecode(response.body) as List<dynamic>;
+        if (releases.isEmpty) {
+          _log.i('No releases found');
+          return null;
+        }
+        
+        // First release is the latest (including prereleases)
+        releaseData = releases.first as Map<String, dynamic>;
+      } else {
+        // For stable channel, use /latest endpoint (excludes prereleases)
+        final response = await http.get(
+          Uri.parse(_latestApiUrl),
+          headers: {'Accept': 'application/vnd.github.v3+json'},
+        ).timeout(const Duration(seconds: 10));
+
+        if (response.statusCode != 200) {
+          _log.w('GitHub API returned ${response.statusCode}');
+          return null;
+        }
+
+        releaseData = jsonDecode(response.body) as Map<String, dynamic>;
       }
 
-      final data = jsonDecode(response.body) as Map<String, dynamic>;
+      final tagName = releaseData['tag_name'] as String? ?? '';
-      final tagName = data['tag_name'] as String? ?? '';
       final latestVersion = tagName.replaceFirst('v', '');
+      final isPrerelease = releaseData['prerelease'] as bool? ?? false;
       
       if (!_isNewerVersion(latestVersion, AppInfo.version)) {
-        _log.i('No update available (current: ${AppInfo.version}, latest: $latestVersion)');
+        _log.i('No update available (current: ${AppInfo.version}, latest: $latestVersion, channel: $channel)');
         return null;
       }
 
-      final body = data['body'] as String? ?? 'No changelog available';
+      final body = releaseData['body'] as String? ?? 'No changelog available';
-      final htmlUrl = data['html_url'] as String? ?? '${AppInfo.githubUrl}/releases';
+      final htmlUrl = releaseData['html_url'] as String? ?? '${AppInfo.githubUrl}/releases';
-      final publishedAt = DateTime.tryParse(data['published_at'] as String? ?? '') ?? DateTime.now();
+      final publishedAt = DateTime.tryParse(releaseData['published_at'] as String? ?? '') ?? DateTime.now();
 
       final deviceArch = await _getDeviceArch();
       _log.d('Device architecture: $deviceArch');
@@ -87,7 +119,7 @@ class UpdateChecker {
       String? arm32Url;
       String? universalUrl;
       
-      final assets = data['assets'] as List<dynamic>? ?? [];
+      final assets = releaseData['assets'] as List<dynamic>? ?? [];
       for (final asset in assets) {
         final name = (asset['name'] as String? ?? '').toLowerCase();
         if (name.endsWith('.apk')) {
@@ -117,7 +149,7 @@ class UpdateChecker {
         apkUrl = universalUrl ?? arm64Url ?? arm32Url;
       }
 
-      _log.i('Update available: $latestVersion, APK URL: $apkUrl');
+      _log.i('Update available: $latestVersion (prerelease: $isPrerelease), APK URL: $apkUrl');
       
       return UpdateInfo(
         version: latestVersion,
@@ -125,6 +157,7 @@ class UpdateChecker {
         downloadUrl: htmlUrl,
         apkDownloadUrl: apkUrl,
         publishedAt: publishedAt,
+        isPrerelease: isPrerelease,
       );
     } catch (e) {
       _log.e('Error checking for updates: $e');

lib/theme/app_theme.dart

@@ -43,6 +43,7 @@ class AppTheme {
   static ThemeData dark({
     ColorScheme? dynamicScheme,
     Color? seedColor,
+    bool isAmoled = false,
   }) {
     final scheme = dynamicScheme ??
         ColorScheme.fromSeed(
@@ -53,7 +54,8 @@ class AppTheme {
     return ThemeData(
       useMaterial3: true,
       colorScheme: scheme,
-      appBarTheme: _appBarTheme(scheme),
+      scaffoldBackgroundColor: isAmoled ? Colors.black : null,
+      appBarTheme: _appBarTheme(scheme, isAmoled: isAmoled),
       cardTheme: _cardTheme(scheme),
       elevatedButtonTheme: _elevatedButtonTheme(scheme),
       filledButtonTheme: _filledButtonTheme(scheme),
@@ -63,7 +65,7 @@ class AppTheme {
       inputDecorationTheme: _inputDecorationTheme(scheme),
       listTileTheme: _listTileTheme(scheme),
       dialogTheme: _dialogTheme(scheme),
-      navigationBarTheme: _navigationBarTheme(scheme),
+      navigationBarTheme: _navigationBarTheme(scheme, isAmoled: isAmoled),
       snackBarTheme: _snackBarTheme(scheme),
       progressIndicatorTheme: _progressIndicatorTheme(scheme),
       switchTheme: _switchTheme(scheme),
@@ -73,12 +75,12 @@ class AppTheme {
   }
 
   /// AppBar theme
-  static AppBarTheme _appBarTheme(ColorScheme scheme) => AppBarTheme(
+  static AppBarTheme _appBarTheme(ColorScheme scheme, {bool isAmoled = false}) => AppBarTheme(
         elevation: 0,
-        scrolledUnderElevation: 3,
+        scrolledUnderElevation: isAmoled ? 0 : 3,
-        backgroundColor: scheme.surface,
+        backgroundColor: isAmoled ? Colors.black : scheme.surface,
         foregroundColor: scheme.onSurface,
-        surfaceTintColor: scheme.surfaceTint,
+        surfaceTintColor: isAmoled ? Colors.transparent : scheme.surfaceTint,
         centerTitle: true,
         titleTextStyle: TextStyle(
           color: scheme.onSurface,
@@ -180,12 +182,12 @@ class AppTheme {
       );
 
   /// Navigation bar theme
-  static NavigationBarThemeData _navigationBarTheme(ColorScheme scheme) =>
+  static NavigationBarThemeData _navigationBarTheme(ColorScheme scheme, {bool isAmoled = false}) =>
       NavigationBarThemeData(
         elevation: 0,
-        backgroundColor: scheme.surfaceContainer,
+        backgroundColor: isAmoled ? Colors.black : scheme.surfaceContainer,
         indicatorColor: scheme.secondaryContainer,
-        surfaceTintColor: scheme.surfaceTint,
+        surfaceTintColor: isAmoled ? Colors.transparent : scheme.surfaceTint,
         labelBehavior: NavigationDestinationLabelBehavior.alwaysShow,
       );
 

lib/theme/dynamic_color_wrapper.dart

@@ -40,12 +40,32 @@ class DynamicColorWrapper extends ConsumerWidget {
           );
         }
 
+        // Apply AMOLED mode if enabled (pure black background)
+        if (themeSettings.useAmoled) {
+          darkScheme = _applyAmoledColors(darkScheme);
+        }
+
         // Build themes
         final lightTheme = AppTheme.light(dynamicScheme: lightScheme);
-        final darkTheme = AppTheme.dark(dynamicScheme: darkScheme);
+        final darkTheme = AppTheme.dark(dynamicScheme: darkScheme, isAmoled: themeSettings.useAmoled);
 
         return builder(lightTheme, darkTheme, themeSettings.themeMode);
       },
     );
   }
+
+  /// Apply AMOLED colors - pure black background with adjusted surface colors
+  ColorScheme _applyAmoledColors(ColorScheme scheme) {
+    return scheme.copyWith(
+      surface: Colors.black,
+      onSurface: Colors.white,
+      surfaceContainerLowest: Colors.black,
+      surfaceContainerLow: const Color(0xFF0A0A0A),
+      surfaceContainer: const Color(0xFF121212),
+      surfaceContainerHigh: const Color(0xFF1A1A1A),
+      surfaceContainerHighest: const Color(0xFF222222),
+      inverseSurface: Colors.white,
+      onInverseSurface: Colors.black,
+    );
+  }
 }

pubspec.lock

@@ -297,22 +297,6 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.1.4"
-  ffmpeg_kit_flutter_new_audio:
-    dependency: "direct main"
-    description:
-      name: ffmpeg_kit_flutter_new_audio
-      sha256: "0a698b46cd163c8e9917af75325c84d27871a2a8b2c37de3b40486cd0ab662ae"
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.0.0"
-  ffmpeg_kit_flutter_platform_interface:
-    dependency: transitive
-    description:
-      name: ffmpeg_kit_flutter_platform_interface
-      sha256: addf046ae44e190ad0101b2fde2ad909a3cd08a2a109f6106d2f7048b7abedee
-      url: "https://pub.dev"
-    source: hosted
-    version: "0.2.1"
   file:
     dependency: transitive
     description:

pubspec.yaml

@@ -1,7 +1,7 @@
 name: spotiflac_android
 description: Download Spotify tracks in FLAC from Tidal, Qobuz & Amazon Music
 publish_to: 'none'
-version: 2.0.6+36
+version: 2.1.5+43
 
 environment:
   sdk: ^3.10.0
@@ -50,8 +50,8 @@ dependencies:
   receive_sharing_intent: ^1.8.1
   logger: ^2.5.0
   
-  # FFmpeg for audio conversion (audio-only version - much smaller)
+  # FFmpeg - using local custom AAR (arm64-v8a + armeabi-v7a only)
-  ffmpeg_kit_flutter_new_audio: ^2.0.0
+  # ffmpeg_kit_flutter_new_audio: ^2.0.0  # Replaced with local AAR
   open_filex: ^4.7.0
   
   # Notifications

pubspec_ios.yaml

@@ -0,0 +1,82 @@
+name: spotiflac_android
+description: Download Spotify tracks in FLAC from Tidal, Qobuz & Amazon Music
+publish_to: 'none'
+version: 2.1.0-preview2+40
+
+environment:
+  sdk: ^3.10.0
+
+dependencies:
+  flutter:
+    sdk: flutter
+  
+  # State Management
+  flutter_riverpod: ^3.1.0
+  riverpod_annotation: ^4.0.0
+  
+  # Navigation
+  go_router: ^17.0.1
+  
+  # Storage & Persistence
+  shared_preferences: ^2.5.3
+  path_provider: ^2.1.5
+  
+  # HTTP & Network
+  http: ^1.4.0
+  dio: ^5.8.0
+  
+  # UI Components
+  cupertino_icons: ^1.0.8
+  cached_network_image: ^3.4.1
+  flutter_svg: ^2.1.0
+  
+  # Material Expressive 3 / Dynamic Color
+  dynamic_color: ^1.7.0
+  material_color_utilities: ^0.11.1
+  
+  # Permissions
+  permission_handler: ^12.0.1
+  
+  # File Picker
+  file_picker: ^10.3.0
+  
+  # JSON Serialization
+  json_annotation: ^4.9.0
+  
+  # Utils
+  url_launcher: ^6.3.1
+  device_info_plus: ^12.3.0
+  share_plus: ^12.0.1
+  receive_sharing_intent: ^1.8.1
+  logger: ^2.5.0
+  
+  # FFmpeg for iOS (uses plugin, Android uses custom AAR)
+  ffmpeg_kit_flutter_new_audio: ^2.0.0
+  open_filex: ^4.7.0
+  
+  # Notifications
+  flutter_local_notifications: ^19.0.0
+
+dev_dependencies:
+  flutter_test:
+    sdk: flutter
+  flutter_lints: ^6.0.0
+  build_runner: ^2.10.4
+  riverpod_generator: ^4.0.0
+  json_serializable: ^6.11.2
+  flutter_launcher_icons: ^0.14.3
+
+flutter_launcher_icons:
+  android: true
+  ios: true
+  image_path: "icon.png"
+  adaptive_icon_background: "#1a1a2e"
+  adaptive_icon_foreground: "icon.png"
+  ios_content_mode: scaleAspectFill
+  remove_alpha_ios: true
+
+flutter:
+  uses-material-design: true
+  
+  assets:
+    - assets/images/