Android Open Source - cameraMediaCodec Bit Buffer Lite

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License

The source code is released under:

Copyright (c) 2014, Zhang Ziyue All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * ...

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Java Source Code

package com.android.testtool;
/* w  w w. j  a va2 s .  c  o  m*/
import java.nio.ByteBuffer;

public final class BitBufferLite {

  private final ByteBuffer mBuffer;
  private int mAvailableBits;
  private int mRestBits;
   
  public BitBufferLite(final ByteBuffer buffer) {
    mBuffer = buffer;
    mAvailableBits = 0;
    mRestBits = 0;
  }
   
  public boolean getBit() {
    return getBits(1) != 0;
  }
   
  public int getBits(final int nBits) {
    if (nBits < 0 || nBits > 32) {
      throw new IllegalArgumentException();
    }
    if (nBits == 0) {
      return 0;
    }
     
    long bits = mRestBits;
    int collected = mAvailableBits;
    while (collected < nBits) {
      bits = (bits << 8) | (mBuffer.get() & 0xFF);
      collected += 8;
    }
    
    mAvailableBits = collected - nBits;
    assert mAvailableBits < 8;
    final int result = (int) (bits >> mAvailableBits);
    mRestBits = (int) (bits & ((1 << mAvailableBits) - 1));
    return result;
  }
}

Java Source Code List