An utility class for java.nio.Buffers : Buffer « File « Android

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3. Buffer

An utility class for java.nio.Buffers

 

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 ke Svedin <ake.svedin@gmail.com>
 * @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;
  }
  
}

   
  

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