How to convert short array to byte array?

Question

I am working with audio, I saved audio data on short array. I want to convert it to a byte array to store the wav file. I don't know convert short[] to byte[]. Can you help me. Thank you very much.

read this http://stackoverflow.com/questions/10804852/how-to-convert-short-array-to-byte-array — lakshman, May 31 '13 at 07:39
thank you very much. I will try this code: private byte[] shortArrayToByteArray(short[] shortArr) { int index; int iterations = shortArr.length; ByteBuffer bb = ByteBuffer.allocate(shortArr.length * 2); for(index = 0; index != iterations; ++index){ bb.putShort(shortArr[index]); } return bb.array(); } — coffee, May 31 '13 at 07:47
If you use ByteBuffer, make sure the byte order is correct for your system. The default is big endian, but many formats use little endian. — Peter Lawrey, May 31 '13 at 08:06

stinepike · Answer 1 · 2013-05-31T08:08:32.603

2

short is 16 bit type and byte is 8 bit type . So from a n length short array you will get a 2n length byte array.

The Basics

before converting an array thing about converting a single short to byte. so as per above line you will create 2 byte from a single short.

The principle will be store first 8 bits two a byte and store second 8 bits to another short. The code will be like this

byte b1, b2;
short s;

b1 = s & 0xff;
b2 = (s >> 8) & 0xff;

Now Array

use the above principal for array now. say the array size of short is n. let the short is s

byte result[2*n];
for(int i = 0; i<2*n ; i=i+2){
    b[i]   = s[i>>1] & 0xff;
    b[i+1] = (s[i>>1 | 1] >> 8) & 0xff;
}

Using ByteBuffer class

you can also convert short array to bytearray using ByteBuffer class.

ByteBuffer byteBuf = ByteBuffer.allocate(2*n);
for(int i = 0; i<n ; i++) {
    byteBuf.putShort(buffer[i]);
}

edited May 31 '13 at 08:08

answered May 31 '13 at 07:51

stinepike

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You forgot about the endianness – SomeWittyUsername May 31 '13 at 07:53
And signedness. This will screw up your data badly, you should at least have used `>>>` – Has QUIT--Anony-Mousse May 31 '13 at 07:54
@icepack I used little endian for example.. the main goal of the question is not to make a byte array for him.. but to give him a concept.. Am i wrong? – stinepike May 31 '13 at 08:00

score 0 · Answer 2 · answered May 31 '13 at 07:40

0

The only way is to create a byte array of the same size as the short array and copy the short array elements

answered May 31 '13 at 07:40

Evgeniy Dorofeev

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thank you very much, I'm testing some code.. – coffee May 31 '13 at 07:55

How to convert short array to byte array?

2 Answers2