How to mix / overlay two mp3 audio file into one mp3 file (not concatenate)

Question

I want to merge two mp3 files into one mp3 file.for example if 1st file is 1min and 2nd file is 30 sec then the output should be one min. In that one min it should play both

Answer 1

I have not done it in Android but I had done it using Adobe flex. I guess the logic remains the same. I followed the following steps:

• I extracted both the mp3s into two byte arrays. (song1ByteArray, song2ByteArray)
• Find out the bigger byte array. (Let's say song1ByteArray is the larger one).

• Create a function which returns the mixed byte array.

  private ByteArray mix2Songs(ByteArray song1ByteArray, ByteArray song2ByteArray){
  int arrLength=song1ByteArray.length; 
  for(int i=0;i0){
          source2_L=song1ByteArray.readFloat();//left channel of audio song2ByteArray
          source2_R=song1ByteArray.readFloat(); //right channel of audio song2ByteArray
      }
      returnResultArr.writeFloat((source_1_L+source_2_L)/2); // average value of the source 1 and 2 left channel
      returnResultArr.writeFloat((source_1_R+source_2_R)/2); // average value of the source 1 and 2 right channel
  }
  return returnResultArr;
  }