Sound with equalizer

Question

Since a few days, I am trying to create an equalizer using C#. Seen NAudio quite a lot time, but I could not find any working equalizer which would work with naudio. Now after a few days, I am finally here @stackoverflow and hopefully, you know a way to create an equalizer using c#.

PS: I've also tried out the System.Media.SoundPlayer. But that SoundPlayer does not even support anything that has to do with dsp. So is there another audio library which works with "pure" audio outside?

Answer 1

So is there another audio library which works with "pure" audio outside?

Yes there is one: https://cscore.codeplex.com

According to the EqualizerSample, you can use the equalizer like that:

using CSCore;
using CSCore.Codecs;
using CSCore.SoundOut;
using CSCore.Streams;
using System;
using System.Threading;

...

private static void Main(string[] args)
{
    const string filename = @"C:\Temp\test.mp3";
    EventWaitHandle waitHandle = new AutoResetEvent(false);

    try
    {
        //create a source which provides audio data
        using(var source = CodecFactory.Instance.GetCodec(filename))
        {
            //create the equalizer.
            //You can create a custom eq with any bands you want, or you can just use the default 10 band eq.
            Equalizer equalizer = Equalizer.Create10BandEqualizer(source);

            //create a soundout to play the source
            ISoundOut soundOut;
            if(WasapiOut.IsSupportedOnCurrentPlatform)
            {
                soundOut = new WasapiOut();
            }
            else
            {
                soundOut = new DirectSoundOut();
            }

            soundOut.Stopped += (s, e) => waitHandle.Set();

            IWaveSource finalSource = equalizer.ToWaveSource(16); //since the equalizer is a samplesource, you have to convert it to a raw wavesource
            soundOut.Initialize(finalSource); //initialize the soundOut with the previously created finalSource
            soundOut.Play();

            /*
             * You can change the filter configuration of the equalizer at any time.
             */
            equalizer.SampleFilters[0].SetGain(20); //eq set the gain of the first filter to 20dB (if needed, you can set the gain value for each channel of the source individually)

            //wait until the playback finished
            //of course that is optional
            waitHandle.WaitOne();

            //remember to dispose and the soundout and the source
            soundOut.Dispose();
        }
    }
    catch(NotSupportedException ex)
    {
        Console.WriteLine("Fileformat not supported: " + ex.Message);
    }
    catch(Exception ex)
    {
        Console.WriteLine("Unexpected exception: " + ex.Message);
    }
}

You can configure the equalizer to what ever you want. And since it runs 100% in realtime, all changes are getting applied instantly. If needed, there is also a possiblity to access modify each channel separately.