import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.CharBuffer;
import java.nio.FloatBuffer;
import java.nio.IntBuffer;
/**
* An utility class for java.nio.Buffers.
* @author Åke Svedin
* @version $Revision: 24 $
* @lastmodified $Date: 2009-08-17 08:32:24 -0700 (Mon, 17 Aug 2009) $
*/
public abstract class BufferUtils {
/**
* @param size number of bytes the buffer should hold
* @return the newly allocated byte buffer
*/
public static ByteBuffer createByteBuffer(int size) {
ByteBuffer bb = ByteBuffer.allocateDirect(size);
bb.order(ByteOrder.nativeOrder());
return bb;
}
/**
* @param size number of chars the buffer should hold
* @return the newly allocated char buffer
*/
public static CharBuffer createCharBuffer(int size) {
ByteBuffer bb = ByteBuffer.allocateDirect(2*size);
bb.order(ByteOrder.nativeOrder());
return bb.asCharBuffer();
}
/**
* @param size number of floats the buffer should hold
* @return the newly allocated float buffer
*/
public static FloatBuffer createFloatBuffer(int size) {
ByteBuffer bb = ByteBuffer.allocateDirect(4*size);
bb.order(ByteOrder.nativeOrder());
return bb.asFloatBuffer();
}
/**
* @param size number of integers the buffer should hold
* @return the newly allocated integer buffer
*/
private static IntBuffer createIntBuffer(int size) {
ByteBuffer bb = ByteBuffer.allocateDirect(4*size);
bb.order(ByteOrder.nativeOrder());
return bb.asIntBuffer();
}
/**
* Converts a float buffer to a fixed point int buffer
* @param floatBuffer a FloatBuffer
* @return an IntBuffer containing fixed points
*/
public static IntBuffer toFixedBuffer(FloatBuffer floatBuffer) {
int len = floatBuffer.capacity();
IntBuffer fixedBuffer = createIntBuffer(len);
floatBuffer.clear();
fixedBuffer.clear();
for(int i = 0; i < len; i++) {
fixedBuffer.put((int)(floatBuffer.get(i)*65536));
}
fixedBuffer.clear();
return null;
}
}