Convert wav to aac or mp3 without saving it to the disk

[alirezanet]

In my application, I have a small mixer that creates a wave file, I would like to convert it to mp3/acc before returning it to the user, and since it is hosted in Linux I probably can't use the MediaFoundationEncoder.

          var fileReaders = filePaths.Select(path => new AudioFileReader(path)).ToArray();
           var playlist = new ConcatenatingSampleProvider(fileReaders);

            _memoryStream = new MemoryStream();
            var writer = new WaveFileWriter(_memoryStream, playlist.WaveFormat);
            var buffer = new float[playlist.WaveFormat.SampleRate * playlist.WaveFormat.Channels];
            int samplesRead;
            while ((samplesRead = playlist.Read(buffer, 0, buffer.Length)) > 0)
            {
                writer.WriteSamples(buffer, 0, samplesRead);
            }
            writer.Flush();
            _memoryStream.Position = 0;
         
            // TODO: we need to return mp3 or ACC file
            return _memoryStream;

this is a simplified version of what I have right now ... does NAudio support in-memory conversion? I couldn't find any working example or documentation