code: public void seedUsingPcmAudio(byte[] data) {
          byte[] key = new byte[64];
          for (int i = 0; i < key.length; i++) {
              int x = 0;
              //Pick 4 random bytes from the PCM audio data, from each of the bytes 
              //take the two least significant bits and concatenate them to form
              //the i-th byte in the seed key
              for (int j = 0; j < 4; j++) {
                  x = (x << 2) | (3 & data[RandomSource.getInt(data.length)]);
              }
              key[i] = (byte) x;
          }
          seed(key);
          initialized = true;
      }
docs: Seed the random generator with 2 least significant bits of randomly picked
  bytes within the provided PCM audio data
  
  @param data PCM audio data