Android Open Source - streamvid N V21 Convertor

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License

The source code is released under:
GNU General Public License
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Java Source Code

/*
 * Copyright (C) 2011-2014 GUIGUI Simon, fyhertz@gmail.com
 * /*from   www. j a  v a2 s  . c om*/
 * This file is part of Spydroid (http://code.google.com/p/spydroid-ipcamera/)
 * 
 * Spydroid is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this source code; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package net.majorkernelpanic.streaming.hw;

import java.nio.ByteBuffer;

import android.media.MediaCodecInfo;

/**
 * Converts from NV21 to YUV420 semi planar or planar.
 */    
public class NV21Convertor {

  private int mSliceHeight, mHeight;
  private int mStride, mWidth;
  private int mSize;
  private boolean mPlanar, mPanesReversed = false;
  private int mYPadding;
  private byte[] mBuffer; 
  ByteBuffer mCopy;
  
  public void setSize(int width, int height) {
    mHeight = height;
    mWidth = width;
    mSliceHeight = height;
    mStride = width;
    mSize = mWidth*mHeight;
  }
  
  public void setStride(int width) {
    mStride = width;
  }
  
  public void setSliceHeigth(int height) {
    mSliceHeight = height;
  }
  
  public void setPlanar(boolean planar) {
    mPlanar = planar;
  }
  
  public void setYPadding(int padding) {
    mYPadding = padding;
  }
  
  public int getBufferSize() {
    return 3*mSize/2;
  }
  
  public void setEncoderColorFormat(int colorFormat) {
    switch (colorFormat) {
    case MediaCodecInfo.CodecCapabilities.COLOR_FormatYUV420SemiPlanar:
    case MediaCodecInfo.CodecCapabilities.COLOR_FormatYUV420PackedSemiPlanar:
    case MediaCodecInfo.CodecCapabilities.COLOR_TI_FormatYUV420PackedSemiPlanar:
      setPlanar(false);
      break;  
    case MediaCodecInfo.CodecCapabilities.COLOR_FormatYUV420Planar:
    case MediaCodecInfo.CodecCapabilities.COLOR_FormatYUV420PackedPlanar:
      setPlanar(true);
      break;
    }
  }
  
  public void setColorPanesReversed(boolean b) {
    mPanesReversed = b;
  }
  
  public int getStride() {
    return mStride;
  }

  public int getSliceHeigth() {
    return mSliceHeight;
  }

  public int getYPadding() {
    return mYPadding;
  }
  
  
  public boolean getPlanar() {
    return mPlanar;
  }
  
  public boolean getUVPanesReversed() {
    return mPanesReversed;
  }
  
  public void convert(byte[] data, ByteBuffer buffer) {
    byte[] result = convert(data);
    buffer.put(result, 0, result.length);
  }
  
  public byte[] convert(byte[] data) {

    // A buffer large enough for every case
    if (mBuffer==null || mBuffer.length != 3*mSliceHeight*mStride/2+mYPadding) {
      mBuffer = new byte[3*mSliceHeight*mStride/2+mYPadding];
    }
    
    if (!mPlanar) {
      if (mSliceHeight==mHeight && mStride==mWidth) {
        // Swaps U and V
        if (!mPanesReversed) {
          for (int i = mSize; i < mSize+mSize/2; i += 2) {
            mBuffer[0] = data[i+1];
            data[i+1] = data[i];
            data[i] = mBuffer[0]; 
          }
        }
        if (mYPadding>0) {
          System.arraycopy(data, 0, mBuffer, 0, mSize);
          System.arraycopy(data, mSize, mBuffer, mSize+mYPadding, mSize/2);
          return mBuffer;
        }
        return data;
      }
    } else {
      if (mSliceHeight==mHeight && mStride==mWidth) {
        // De-interleave U and V
        if (!mPanesReversed) {
          for (int i = 0; i < mSize/4; i+=1) {
            mBuffer[i] = data[mSize+2*i+1];
            mBuffer[mSize/4+i] = data[mSize+2*i];
          }
        } else {
          for (int i = 0; i < mSize/4; i+=1) {
            mBuffer[i] = data[mSize+2*i];
            mBuffer[mSize/4+i] = data[mSize+2*i+1];
          }
        }
        if (mYPadding == 0) {
          System.arraycopy(mBuffer, 0, data, mSize, mSize/2);
        } else {
          System.arraycopy(data, 0, mBuffer, 0, mSize);
          System.arraycopy(mBuffer, 0, mBuffer, mSize+mYPadding, mSize/2);
          return mBuffer;
        }
        return data;
      }
    }
    
    return data;
  }  
  
}
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