auric 0.0.4-alpha

Lavalink v4 client for Dart with multi-source music support (YouTube, Spotify, Apple Music, SoundCloud). Built from scratch with audio filters and queue management.

🎵 Auric

Modern Lavalink v4 Client for Dart

Stream music from 10+ platforms • Audio filters • Queue management • Pure Dart

Getting Started • Examples • Documentation • Discord

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What is Auric?

Auric is a powerful Lavalink v4 client written in pure Dart. Built from the ground up with simplicity and performance in mind, it makes creating music bots and audio applications straightforward and enjoyable.

// Get started in seconds
final auric = LavalinkClient(host: 'localhost', port: 2333, password: 'yourpass', userId: 'bot-id');
await auric.connect();

final result = await auric.loadTracks('ytsearch:never gonna give you up');
final player = auric.getPlayer('guild-id');
await player.play(result.tracks!.first);

Why Choose Auric?

⚡ Simple Get a working music bot running in under 10 lines of code. No boilerplate, no complexity.	🌍 Multi-Source Stream from YouTube, Spotify, Apple Music, SoundCloud, and 10+ other platforms seamlessly.	🎛️ Feature-Rich Professional audio filters, advanced queue management, and real-time event streaming included.
🔧 Pure Dart Zero native dependencies. Works on all platforms where Dart runs.	📚 Well Documented Comprehensive guides, working examples, and clear API documentation.	🚀 Production Ready Battle-tested in real Discord bots serving thousands of users.

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Quick Start

Installation

Add Auric to your pubspec.yaml:

dependencies:
  auric: ^0.0.2-alpha

Then run:

dart pub get

Your First Music Player

Here's a complete example that searches for a song and plays it:

import 'package:auric/auric.dart';

void main() async {
  // Connect to your Lavalink server
  final auric = LavalinkClient(
    host: 'localhost',
    port: 2333,
    password: 'youshallnotpass',
    userId: 'your-bot-id',
  );
  
  await auric.connect();
  
  // Search and play a track
  final result = await auric.loadTracks('ytsearch:never gonna give you up');
  final track = result.tracks!.first;
  
  final player = auric.getPlayer('guild-id');
  await player.play(track);
  
  print('Now playing: ${track.info.title}');
}

That's it. You're streaming music.

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Multi-Source Music

Auric makes it trivial to search across different platforms. Just prefix your search query:

// Search YouTube
final yt = await auric.loadTracks('ytsearch:despacito');

// Search Spotify
final sp = await auric.loadTracks('spsearch:imagine dragons');

// Search Apple Music
final am = await auric.loadTracks('amsearch:taylor swift');

// Search SoundCloud
final sc = await auric.loadTracks('scsearch:chill beats');

Or use the helper class for cleaner code:

final query = SearchQuery.parse('sp imagine dragons');
final result = await auric.loadTracks(query.toLavalinkQuery());

Supported platforms: YouTube, YouTube Music, Spotify, Apple Music, SoundCloud, Deezer, Yandex Music, Bandcamp, Twitch, Vimeo, and more.

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Queue Management

Building a playlist? Auric handles queues elegantly:

final player = auric.getPlayer('guild-id');

// Add tracks to the queue
player.addToQueue(track1);
player.addToQueue(track2);
player.addToQueue(track3);

// Play the queue
await player.play(player.queue.first);

// Skip to next track
await player.playNext();

// Shuffle the queue
player.shuffleQueue();

// Clear everything
player.clearQueue();

// Listen to queue changes
player.queueStream.listen((queue) {
  print('Queue updated: ${queue.length} tracks');
});

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Audio Filters

Want to add some flavor to your music? Apply professional-grade audio effects:

final player = auric.getPlayer('guild-id');

// Nightcore (faster, higher pitch)
await player.setFilters(Timescale.nightcore().toJson());

// Vaporwave (slower, lower pitch)
await player.setFilters(Timescale.vaporwave().toJson());

// Bass boost
await player.setFilters(Equalizer.bassBoost().toJson());

// 8D audio effect
await player.setFilters(Rotation.slow().toJson());

// Karaoke mode (remove vocals)
await player.setFilters(Karaoke.preset().toJson());

// Combine multiple filters
final combined = FilterConfig(
  timescale: Timescale.nightcore(),
  equalizer: Equalizer.bassBoost(),
  rotation: Rotation.fast(),
);
await player.setFilters(combined.toJson());

// Reset to normal
await player.clearFilters();

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Real-Time Events

Stay informed about what's happening with your player:

auric.eventStream.listen((event) {
  if (event is TrackStartEvent) {
    print('Started: ${event.track.info.title}');
  } else if (event is TrackEndEvent) {
    print('Ended: ${event.reason}');
    // Auto-play next track
    if (event.reason == 'finished') {
      player.playNext();
    }
  } else if (event is TrackStuckEvent) {
    print('Track stuck at ${event.thresholdMs}ms');
  } else if (event is WebSocketClosedEvent) {
    print('Connection lost: ${event.reason}');
  }
});

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Playback Control

Full control over your audio:

final player = auric.getPlayer('guild-id');

// Basic controls
await player.pause();
await player.resume();
await player.stop();

// Volume control (0-200)
await player.setVolume(150);

// Seek to specific position
await player.seek(Duration(seconds: 30));

// Check current state
print('Position: ${player.position}');
print('Duration: ${player.currentTrack?.info.duration}');
print('Is paused: ${player.isPaused}');

---

Building a Discord Bot

Auric includes a ready-to-use bot framework. Here's a complete Discord music bot in minimal code:

import 'package:auric/auric.dart';

void main() async {
  final bot = EasyMusicBot(
    lavalinkHost: 'localhost',
    lavalinkPort: 2333,
    lavalinkPassword: 'youshallnotpass',
    botUserId: 'your-bot-id',
    prefix: '!',
  );
  
  await bot.start();
  
  // Integrate with your Discord library
  discordClient.onMessage.listen((msg) async {
    final response = await bot.handleMessage(
      message: msg.content,
      userId: msg.author.id,
      guildId: msg.guild.id,
      channelId: msg.channel.id,
    );
    
    if (response != null) {
      await msg.channel.send(response);
    }
  });
}

This gives you 30+ commands out of the box:

• Playback: !play, !pause, !resume, !stop, !skip
• Queue: !queue, !shuffle, !clear, !remove
• Audio: !nightcore, !bassboost, !8d, !karaoke
• Controls: !volume, !seek, !forward, !rewind
• Info: !nowplaying, !help, !sources

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Lavalink Setup

Auric requires a Lavalink server. Here's the fastest way to get one running:

Using Docker

docker run -d \
  --name lavalink \
  -p 2333:2333 \
  -v $(pwd)/application.yml:/opt/Lavalink/application.yml \
  fredboat/lavalink:latest

Configuration (application.yml)

server:
  port: 2333
  address: 0.0.0.0

lavalink:
  server:
    password: "youshallnotpass"
    sources:
      youtube: true
      soundcloud: true
    bufferDurationMs: 400
    frameBufferDurationMs: 5000

plugins:
  lavasrc:
    providers:
      - "ytsearch:\"%ISRC%\""
      - "ytsearch:%QUERY%"
    sources:
      spotify: true
      applemusic: true
      deezer: true
      yandexmusic: true
      spotify: true
      applemusic: true

Note: API credentials are configured in the Lavalink server's application.yml. Auric clients don't need API keys - the Lavalink server handles authentication with external services.

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Examples

Check the example/ directory for complete working examples:

• basic_usage.dart - Core features and playback control
• queue_management.dart - Advanced queue operations
• audio_filters.dart - All available audio effects
• multi_source_search.dart - Searching across platforms
• discord_bot_example.dart - Full Discord bot integration
• super_easy_bot.dart - Minimal bot using the framework

Run any example:

dart run example/basic_usage.dart

---

API Overview

LavalinkClient

The main client for connecting to Lavalink:

final auric = LavalinkClient(
  host: 'localhost',
  port: 2333,
  password: 'youshallnotpass',
  userId: 'bot-id',
);

await auric.connect(enableResuming: true);
final player = auric.getPlayer('guild-id');
await auric.disconnect();

Player

Control playback for a specific guild/room:

// Playback
await player.play(track);
await player.pause();
await player.resume();
await player.stop();

// Queue
player.addToQueue(track);
await player.playNext();
await player.skipTo(index);
player.shuffleQueue();
player.clearQueue();

// Volume & Seeking
await player.setVolume(100);
await player.seek(Duration(seconds: 30));

// Filters
await player.setFilters(Timescale.nightcore().toJson());
await player.clearFilters();

// State
print(player.currentTrack);
print(player.position);
print(player.queue);
print(player.isPaused);

Search

Find music from any platform:

// Direct search
final result = await auric.loadTracks('ytsearch:query');

// Using helper
final query = SearchQuery.parse('sp artist name');
final result = await auric.loadTracks(query.toLavalinkQuery());

// Check result type
if (result.tracks != null) {
  print('Found ${result.tracks!.length} tracks');
} else if (result.playlist != null) {
  print('Found playlist: ${result.playlist!.name}');
}

---

Advanced Features

Session Resuming

Keep playback going even if your bot restarts:

await auric.connect(
  enableResuming: true,
  sessionId: 'my-session-id',
);

Event Streaming

React to player events in real-time:

auric.eventStream.listen((event) {
  // Handle all event types
});

player.queueStream.listen((queue) {
  // Queue updated
});

Direct REST API

For advanced use cases, access the REST API directly:

final stats = await auric.rest.getStats();
final info = await auric.rest.getInfo();

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Troubleshooting

Connection refused

• Ensure Lavalink is running on the correct host and port
• Check firewall settings

No tracks found

• Verify the Lavalink plugins are configured (LavaSrc for Spotify, Apple Music, etc.)
• Check API credentials in application.yml

Playback issues

• Ensure the bot has joined a voice channel before playing
• Check Lavalink logs for errors

Session resuming not working

• Use the same sessionId when reconnecting
• Ensure resuming is enabled in Lavalink config

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Contributing

Contributions are welcome! Here's how you can help:

1. Fork the repository
2. Create a feature branch (git checkout -b feature/amazing-feature)
3. Make your changes
4. Run tests (dart test)
5. Commit (git commit -m 'Add amazing feature')
6. Push (git push origin feature/amazing-feature)
7. Open a Pull Request

Please ensure your code follows Dart style guidelines and includes tests.

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License

MIT License - see LICENSE file for details.

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Acknowledgments

Auric wouldn't exist without these amazing projects:

• Lavalink - The robust audio server that powers Auric
• LavaSrc - Multi-source plugin for Lavalink
• Dart Team - For creating an excellent language and ecosystem

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Links

• GitHub Repository
• Lavalink Documentation
• Discord - Join for support and discussion

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Built with care by the Auric team. Happy streaming! 🎵