code: public void write(BitOutputStream os) throws IOException {
  
          os.writeRawULong(sampleNumber, SEEKPOINT_SAMPLE_NUMBER_LEN);
          os.writeRawULong(streamOffset, SEEKPOINT_STREAM_OFFSET_LEN);
          os.writeRawUInt(frameSamples, SEEKPOINT_FRAME_SAMPLES_LEN);
      }
docs: Write out an individual seek point.
  @param os    The output stream
  @throws IOException  Thrown if error writing data