C# How to change the bit rate of the mp3 via script?

T$$anonymous$$s is the function that I set the header for the audio output. Can anyone help me to change the bit rate to 112?

static void WriteHeader(FileStream fileStream, AudioClip clip) {

     var hz = clip.frequency;
     var channels = clip.channels;
     var samples = clip.samples;

     fileStream.Seek(0, SeekOrigin.Begin);

     Byte[] riff = System.Text.Encoding.UTF8.GetBytes("RIFF");
     fileStream.Write(riff, 0, 4);

     Byte[] chunkSize = BitConverter.GetBytes(fileStream.Length - 8);
     fileStream.Write(chunkSize, 0, 4);

     Byte[] wave = System.Text.Encoding.UTF8.GetBytes("WAVE");
     fileStream.Write(wave, 0, 4);

     Byte[] fmt = System.Text.Encoding.UTF8.GetBytes("fmt ");
     fileStream.Write(fmt, 0, 4);

     Byte[] subChunk1 = BitConverter.GetBytes(16);
     fileStream.Write(subChunk1, 0, 4);

     UInt16 two = 2;
     UInt16 one = 1;

     Byte[] audioFormat = BitConverter.GetBytes(one);
     fileStream.Write(audioFormat, 0, 2);

     Byte[] numChannels = BitConverter.GetBytes(channels);
     fileStream.Write(numChannels, 0, 2);

     Byte[] sampleRate = BitConverter.GetBytes(hz);
     fileStream.Write(sampleRate, 0 , 4);

     Byte[] byteRate = BitConverter.GetBytes(hz * channels * 2);
     fileStream.Write(byteRate, 0, 4);

     UInt16 blockAlign = (ushort)(channels * 2);
     fileStream.Write(BitConverter.GetBytes(blockAlign), 0, 2);

     UInt16 bps = 16;
     Byte[] bitsPerSample = BitConverter.GetBytes(bps);
     fileStream.Write(bitsPerSample, 0, 2);

     Byte[] datastring = System.Text.Encoding.UTF8.GetBytes("data");
     fileStream.Write(datastring, 0, 4);

     Byte[] subChunk2 = BitConverter.GetBytes(samples * channels * 2);
     fileStream.Write(subChunk2, 0, 4);

     fileStream.Close();
 }