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我正在尝试将播放音乐的功能添加到我的自定义 Discord 机器人中。我正在用 Java 11、Spring Boot、Discord4j 和 LavaPlayer 库编写它。

我有命令 !join 使 Discord 机器人加入输入命令的人的语音频道。这可行，但我将其分配给LavaPlayerAudioProvider机器人VoiceState加入后。所以这里可能会出现错误（我不知道）。这是 !join 命令的类：

@RequiredArgsConstructor
public class JoinCommandHandler implements CommandStrategy {
    private final LavaPlayerAudioProvider provider;

    /**
     * {@inheritDoc}
     * <p>
     * Makes the bot join the voice channel of the user.
     */
    @Override
    public Mono<Void> execute(Message message) {
        return Mono.just(message)
                .flatMap(Message::getAuthorAsMember)
                .flatMap(m -> m.getVoiceState()
                        .flatMap(VoiceState::getChannel))
                .flatMap(c -> c.join(spec -> spec.setProvider(provider)))
                .then();
    }

    @Override
    public String getCommandName() {
        return "!join";
    }

    @Override
    public String getDescription() {
        return "**Under Development** Make this bot join your channel.";
    }
}

老实说，我认为错误不会出现在 !join 命令中，但更多地理解这个问题可能会很有用。

我在AudioConfig类中设置了这样的音频配置：

@Configuration
public class AudioConfig {
    @Bean
    public AudioPlayerManager audioPlayerManager() {
        final AudioPlayerManager playerManager = new DefaultAudioPlayerManager();
        playerManager.getConfiguration().setFrameBufferFactory(NonAllocatingAudioFrameBuffer::new);
        AudioSourceManagers.registerLocalSource(playerManager);
        return playerManager;
    }

    @Bean
    public AudioPlayer audioPlayer() {
        return audioPlayerManager().createPlayer();
    }

    @Bean
    public AudioProvider audioProvider() {
        return new LavaPlayerAudioProvider(audioPlayer());
    }
}

一旦机器人加入语音频道，我写了一个 !play [youtube url] 命令来播放音乐。

@Service("!play")
@RequiredArgsConstructor
public class PlayCommand implements CommandStrategy {
    private final AudioPlayerManager manager;
    private final TrackScheduler trackScheduler;

    /**
     * {@inheritDoc}
     * <p>
     * Makes the bot queue a song and play in the channel.
     */
    @Override
    public Mono<Void> execute(Message message) {
        return Mono.just(message.getContent())
                .map(content -> Arrays.asList(content.split(" ")))
                .doOnNext(command -> manager.loadItem(command.get(1), trackScheduler)).then();
    }
}

在这里LavaPlayerAudioProviver提供音乐：

@Component
public final class LavaPlayerAudioProvider extends AudioProvider {
    private final AudioPlayer audioPlayer;
    private final MutableAudioFrame frame = new MutableAudioFrame();

    public LavaPlayerAudioProvider(AudioPlayer audioPlayer) {
        super(ByteBuffer.allocate(StandardAudioDataFormats.DISCORD_OPUS.maximumChunkSize()));
        this.frame.setBuffer(getBuffer());
        this.audioPlayer = audioPlayer;
    }

    @Override
    public boolean provide() {
        final boolean didProvide = audioPlayer.provide(frame);
        if (didProvide) {
            getBuffer().flip();
        }
        return didProvide;
    }
}

现在，棘手的部分来了。我调试了代码以逐步查看在我键入 !play [url] 命令后代码是如何执行的。

当代码到达TrackScheduler类时，并没有执行trackLoaded()播放歌曲的方法，而是执行了该noMatches()方法，这基本上意味着找不到URL，因此无法播放音乐。你可以在TrackScheduler这里找到课程：

@Component
@RequiredArgsConstructor
public class TrackScheduler implements AudioLoadResultHandler {
    private final AudioPlayer player;

    @Override
    public void trackLoaded(final AudioTrack track) {
        // LavaPlayer found an audio source for us to play
        player.playTrack(track);
    }

    @Override
    public void playlistLoaded(final AudioPlaylist playlist) {
        // LavaPlayer found multiple AudioTracks from some playlist
    }

    @Override
    public void noMatches() {
        // LavaPlayer did not find any audio to extract
    }

    @Override
    public void loadFailed(final FriendlyException exception) {
        // LavaPlayer could not parse an audio source for some reason
    }
}

我尝试了不同的 URL，但它们最终都进入了 noMatch() 方法......我遵循了 Discord4J 指南（https://docs.discord4j.com/music-bot-tutorial）但他们没有使用 Spring Boot 所以这是一个小谜题..

如果您需要更多信息，我很乐意提供给您。提前谢谢各位！

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