Bass Boost – JDA Lavaplayer

How would you create a bass boost command when you are using Lavaplayer with JDA (Java Discord API)?

Have a command like !bassboost 0-100.

Answer

After hours of trying different things to get it to function correctly I ended up using a Lavaplayer EqualizerFactory.

Firstly I copied these values from here

    public static final float[] BASS_BOOST = {
            0.2f,
            0.15f,
            0.1f,
            0.05f,
            0.0f,
            -0.05f,
            -0.1f,
            -0.1f,
            -0.1f,
            -0.1f,
            -0.1f,
            -0.1f,
            -0.1f,
            -0.1f,
            -0.1f
    };

then I created a new EqualizerFactory and added it as a filter to the guild music manager and also set the frame buffer duration to make the bass-boost take less time to take effect like so:

        this.equalizer = new EqualizerFactory();

        this.player.setFilterFactory(equalizer);
        this.player.setFrameBufferDuration(500); // prevent bass boost taking time to take effect

then I finally created a little method that you can provide from 0-200 to set the bass-boost level

    public void bassBoost(float percentage)
    {
        final float multiplier = percentage / 100.00f;

        for (int i = 0; i < BASS_BOOST.length; i++)
        {
            equalizer.setGain(i, BASS_BOOST[i] * multiplier);
        }
    }

so that the bass-boost took effect on the current playing song I needed this:

playerManager.getConfiguration().setFilterHotSwapEnabled(true);

and that’s about it really!