4 files changed, 306 insertions, 0 deletions
diff --git a/src/main/java/soundbot/AudioPlayerSendHandler.java b/src/main/java/soundbot/AudioPlayerSendHandler.java
new file mode 100644
index 0000000..6499aad
--- /dev/null
+++ b/src/main/java/soundbot/AudioPlayerSendHandler.java
@@ -0,0 +1,48 @@
+package soundbot;
+
+import com.sedmelluq.discord.lavaplayer.player.AudioPlayer;
+import com.sedmelluq.discord.lavaplayer.track.playback.AudioFrame;
+import net.dv8tion.jda.core.audio.AudioSendHandler;
+
+/**
+ * This is a wrapper around AudioPlayer which makes it behave as an AudioSendHandler for JDA. As JDA calls canProvide
+ * before every call to provide20MsAudio(), we pull the frame in canProvide() and use the frame we already pulled in
+ * provide20MsAudio().
+ */
+public class AudioPlayerSendHandler implements AudioSendHandler {
+  private final AudioPlayer audioPlayer;
+  private AudioFrame lastFrame;
+
+  /**
+   * @param audioPlayer Audio player to wrap.
+   */
+  public AudioPlayerSendHandler(AudioPlayer audioPlayer) {
+    this.audioPlayer = audioPlayer;
+  }
+
+  @Override
+  public boolean canProvide() {
+    if (lastFrame == null) {
+      lastFrame = audioPlayer.provide();
+    }
+
+    return lastFrame != null;
+  }
+
+  @Override
+  public byte[] provide20MsAudio() {
+    if (lastFrame == null) {
+      lastFrame = audioPlayer.provide();
+    }
+
+    byte[] data = lastFrame != null ? lastFrame.data : null;
+    lastFrame = null;
+
+    return data;
+  }
+
+  @Override
+  public boolean isOpus() {
+    return true;
+  }
+}
diff --git a/src/main/java/soundbot/GuildMusicManager.java b/src/main/java/soundbot/GuildMusicManager.java
new file mode 100644
index 0000000..fc46756
--- /dev/null
+++ b/src/main/java/soundbot/GuildMusicManager.java
@@ -0,0 +1,35 @@
+package soundbot;
+
+import com.sedmelluq.discord.lavaplayer.player.AudioPlayer;
+import com.sedmelluq.discord.lavaplayer.player.AudioPlayerManager;
+
+/**
+ * Holder for both the player and a track scheduler for one guild.
+ */
+public class GuildMusicManager {
+  /**
+   * Audio player for the guild.
+   */
+  public final AudioPlayer player;
+  /**
+   * Track scheduler for the player.
+   */
+  public final TrackScheduler scheduler;
+
+  /**
+   * Creates a player and a track scheduler.
+   * @param manager Audio player manager to use for creating the player.
+   */
+  public GuildMusicManager(AudioPlayerManager manager) {
+    player = manager.createPlayer();
+    scheduler = new TrackScheduler(player);
+    player.addListener(scheduler);
+  }
+
+  /**
+   * @return Wrapper around AudioPlayer to use it as an AudioSendHandler.
+   */
+  public AudioPlayerSendHandler getSendHandler() {
+    return new AudioPlayerSendHandler(player);
+  }
+}
diff --git a/src/main/java/soundbot/Main.java b/src/main/java/soundbot/Main.java
new file mode 100644
index 0000000..2255c68
--- /dev/null
+++ b/src/main/java/soundbot/Main.java
@@ -0,0 +1,167 @@
+package soundbot;
+
+import com.sedmelluq.discord.lavaplayer.player.AudioLoadResultHandler;
+import com.sedmelluq.discord.lavaplayer.player.AudioPlayerManager;
+import com.sedmelluq.discord.lavaplayer.player.DefaultAudioPlayerManager;
+import com.sedmelluq.discord.lavaplayer.source.AudioSourceManagers;
+import com.sedmelluq.discord.lavaplayer.tools.FriendlyException;
+import com.sedmelluq.discord.lavaplayer.track.AudioPlaylist;
+import com.sedmelluq.discord.lavaplayer.track.AudioTrack;
+import net.dv8tion.jda.core.AccountType;
+import net.dv8tion.jda.core.JDA;
+import net.dv8tion.jda.core.JDABuilder;
+import net.dv8tion.jda.core.entities.Guild;
+import net.dv8tion.jda.core.entities.TextChannel;
+import net.dv8tion.jda.core.entities.VoiceChannel;
+import net.dv8tion.jda.core.events.message.MessageReceivedEvent;
+import net.dv8tion.jda.client.events.call.voice.CallVoiceJoinEvent;
+import net.dv8tion.jda.core.hooks.ListenerAdapter;
+import net.dv8tion.jda.core.managers.AudioManager;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class Main extends ListenerAdapter {
+  public static void main(String[] args) throws Exception {
+    JDA jda = new JDABuilder(AccountType.BOT)
+        .setToken(System.getProperty("botToken"))
+        .buildBlocking();
+
+    jda.addEventListener(new Main());
+  }
+
+  private final AudioPlayerManager playerManager;
+  private final Map<Long, GuildMusicManager> musicManagers;
+
+  private Main() {
+    this.musicManagers = new HashMap<>();
+
+    this.playerManager = new DefaultAudioPlayerManager();
+    AudioSourceManagers.registerRemoteSources(playerManager);
+    AudioSourceManagers.registerLocalSource(playerManager);
+  }
+
+  private synchronized GuildMusicManager getGuildAudioPlayer(Guild guild) {
+    long guildId = Long.parseLong(guild.getId());
+    GuildMusicManager musicManager = musicManagers.get(guildId);
+
+    if (musicManager == null) {
+      musicManager = new GuildMusicManager(playerManager);
+      musicManagers.put(guildId, musicManager);
+    }
+
+    guild.getAudioManager().setSendingHandler(musicManager.getSendHandler());
+
+    return musicManager;
+  }
+
+  @Override
+  public void onCallVoiceJoin(CallVoiceJoinEvent event){
+    
+  }
+
+  @Override
+  public void onMessageReceived(MessageReceivedEvent event) {
+    String[] command = event.getMessage().getContentRaw().split(" ", 2);
+    Guild guild = event.getGuild();
+
+    if (guild != null) {
+      if ("~play".equals(command[0]) && command.length == 2) {
+        loadAndPlay(event.getTextChannel(), command[1]);
+      } else if ("~skip".equals(command[0])) {
+        skipTrack(event.getTextChannel());
+      } else if ("~volume".equals(command[0]) && command.length == 2) {
+        changeVolume(event.getTextChannel(), command[1]);
+      } else if ("~pause".equals(command[0])) {
+        pauseTrack(event.getTextChannel());
+      } else if ("~unpause".equals(command[0])) {
+        unpauseTrack(event.getTextChannel());
+      }
+    }
+
+    super.onMessageReceived(event);
+  }
+
+  private void changeVolume(final TextChannel channel, final String volume) {
+    GuildMusicManager musicManager = getGuildAudioPlayer(channel.getGuild());
+    musicManager.player.setVolume(Integer.parseInt(volume));
+    channel.sendMessage("Volume now set to " + volume + "%").queue();
+  }
+
+  private void pauseTrack(final TextChannel channel){
+    GuildMusicManager musicManager = getGuildAudioPlayer(channel.getGuild());
+    musicManager.player.setPaused(true);
+    channel.sendMessage("Playback Paused.").queue();
+  }
+
+  private void unpauseTrack(final TextChannel channel){
+    GuildMusicManager musicManager = getGuildAudioPlayer(channel.getGuild());
+    musicManager.player.setPaused(false);
+    channel.sendMessage("Unpaused playback.").queue();
+  }
+
+  private void loadAndPlay(final TextChannel channel, final String trackUrl) {
+    GuildMusicManager musicManager = getGuildAudioPlayer(channel.getGuild());
+
+    playerManager.loadItemOrdered(musicManager, trackUrl, new AudioLoadResultHandler() {
+      @Override
+      public void trackLoaded(AudioTrack track) {
+        int timeStart = trackUrl.lastIndexOf('=');
+        if(timeStart != -1){
+          String timeString = trackUrl.substring(timeStart);
+          //The format will be 1h2m53s, need to parse that into seconds and then call
+          //track.setPosition(long position)
+
+        }
+        channel.sendMessage("Adding to queue " + track.getInfo().title).queue();
+
+        play(channel.getGuild(), musicManager, track);
+      }
+
+      @Override
+      public void playlistLoaded(AudioPlaylist playlist) {
+        AudioTrack firstTrack = playlist.getSelectedTrack();
+
+        if (firstTrack == null) {
+          firstTrack = playlist.getTracks().get(0);
+        }
+
+        channel.sendMessage("Adding to queue " + firstTrack.getInfo().title + " (first track of playlist " + playlist.getName() + ")").queue();
+
+        play(channel.getGuild(), musicManager, firstTrack);
+      }
+
+      @Override
+      public void noMatches() {
+        channel.sendMessage("Nothing found by " + trackUrl).queue();
+      }
+
+      @Override
+      public void loadFailed(FriendlyException exception) {
+        channel.sendMessage("Could not play: " + exception.getMessage()).queue();
+      }
+    });
+  }
+
+  private void play(Guild guild, GuildMusicManager musicManager, AudioTrack track) {
+    connectToFirstVoiceChannel(guild.getAudioManager());
+
+    musicManager.scheduler.queue(track);
+  }
+
+  private void skipTrack(TextChannel channel) {
+    GuildMusicManager musicManager = getGuildAudioPlayer(channel.getGuild());
+    musicManager.scheduler.nextTrack();
+
+    channel.sendMessage("Skipped to next track.").queue();
+  }
+
+  private static void connectToFirstVoiceChannel(AudioManager audioManager) {
+    if (!audioManager.isConnected() && !audioManager.isAttemptingToConnect()) {
+      for (VoiceChannel voiceChannel : audioManager.getGuild().getVoiceChannels()) {
+        audioManager.openAudioConnection(voiceChannel);
+        break;
+      }
+    }
+  }
+}
diff --git a/src/main/java/soundbot/TrackScheduler.java b/src/main/java/soundbot/TrackScheduler.java
new file mode 100644
index 0000000..4cbda71
--- /dev/null
+++ b/src/main/java/soundbot/TrackScheduler.java
@@ -0,0 +1,56 @@
+package soundbot;
+
+import com.sedmelluq.discord.lavaplayer.player.AudioPlayer;
+import com.sedmelluq.discord.lavaplayer.player.event.AudioEventAdapter;
+import com.sedmelluq.discord.lavaplayer.track.AudioTrack;
+import com.sedmelluq.discord.lavaplayer.track.AudioTrackEndReason;
+
+import java.util.concurrent.BlockingQueue;
+import java.util.concurrent.LinkedBlockingQueue;
+
+/**
+ * This class schedules tracks for the audio player. It contains the queue of tracks.
+ */
+public class TrackScheduler extends AudioEventAdapter {
+  private final AudioPlayer player;
+  private final BlockingQueue<AudioTrack> queue;
+
+  /**
+   * @param player The audio player this scheduler uses
+   */
+  public TrackScheduler(AudioPlayer player) {
+    this.player = player;
+    this.queue = new LinkedBlockingQueue<>();
+  }
+
+  /**
+   * Add the next track to queue or play right away if nothing is in the queue.
+   *
+   * @param track The track to play or add to queue.
+   */
+  public void queue(AudioTrack track) {
+    // Calling startTrack with the noInterrupt set to true will start the track only if nothing is currently playing. If
+    // something is playing, it returns false and does nothing. In that case the player was already playing so this
+    // track goes to the queue instead.
+    if (!player.startTrack(track, true)) {
+      queue.offer(track);
+    }
+  }
+
+  /**
+   * Start the next track, stopping the current one if it is playing.
+   */
+  public void nextTrack() {
+    // Start the next track, regardless of if something is already playing or not. In case queue was empty, we are
+    // giving null to startTrack, which is a valid argument and will simply stop the player.
+    player.startTrack(queue.poll(), false);
+  }
+
+  @Override
+  public void onTrackEnd(AudioPlayer player, AudioTrack track, AudioTrackEndReason endReason) {
+    // Only start the next track if the end reason is suitable for it (FINISHED or LOAD_FAILED)
+    if (endReason.mayStartNext) {
+      nextTrack();
+    }
+  }
+}