Mix Byte Array Android

I would like to mix audio byte array, but I didn't succeed to sum the array.(note i already added some silent bytes of 0 as padding before). I have an ArrayList of byte[] which con

Solution 1:

you have to declare your sources to merge them

byte[] source1 = ListAudio.get(0); //first from list
byte[] source2 = ListAudio.get(1); //second from list

intlength = Math.min(source1.length, source2.length);//length of new array
length = length - 44; //skipping 44 byte

byte[] dest = new byte[length];
for(intindex = 0; index < length; index ++){
    byte b1 = source1[index+44];
    byte b2 = source2[index+44];
    dest[index] = (byte) ((b1+b2) / 2);
}

That would merge the first two byte[] from your list.

If you want to merge other sources you can change them by selecting other byte[] from your List.

HINT The length of the destination is declared as Math.min(a,b) but you can fill missing bytes with zeros if you want...

if you want to merge all arrays, you have to adjust your merge operation

mixing two bytes: mixBytes[i]=(byte) ((bytes1[i]+bytes2[i]) / 2);

mixing three bytes: mixBytes[i]=(byte) ((bytes1[i]+bytes2[i]+bytes3[i]) / 3);

mixing N bytes: mixBytes[i]=(byte) ((bytes1[i]+bytes2[i]+bytes3[i]+...+bytesN[i]) / N);

ok, for your code snipped it would be:

int length = ...;//length of result, either min or max as mentioned above, see HINTbyte[] mixBytes = newbyte[length]; 

int amountAudio = ListAudio.size(); //amount of tracks in your list aka 'N' int sum;
for(int index = 0; index < length; index++){
    sum = 0;
    for(byte[] source: ListAudio){
        //adding all byte into one big integer
        sum = sum + source[index]; //NOTE: watch for indexOutOfBoundsException
    }
    //afterward divide the big int through amount of Audio tracks in your list
    mixBytes[index] = (byte)(sum / amountAudio);
}