Crop YUV data and YUV data

Crop YUV data and YUV data

Used in the project to crop YUV data (the yuv of an image or the yuv data of a single video frame.

Format Introduction: http://blog.csdn.net/vblittleboy/article/details/10945143

Import android. graphics. rectF; import android. util. log;/*** used to crop yuv images * @ author willhua **/public class YuvCroper {private static String LOG_TAG = "VideoCrop"; public static int YUV_420SP = 0; // that is, NV12 YYY... UVUVUV... public static int YUV_420P = 1; // that is, I420 YYY... UUU... VVV... private final int mType; private byte [] mData; private final int mWidth; private final int mHeight; private final int mYL Enght; private final int mCropLeft; private final int mCropTop; private int mCropWidth; private int mCropHeight;/***** @ param type yuv data type: YUV_SP () YUV_420P () * @ param width the original width of yuv data * @ param height the original height of yuv data * @ param crop the cropped area. For example (0.25, 0.85,), each value is between 0 and 1 * @ throws Exception */public YuvCroper (int type, int width, int height, RectF crop) throws Exception {if (width <= 0 | height <= 0 | crop = null | crop. width () <= 0 | crop. height () <= 0) {throw new Exception ("ViewCrop: Wrong param! Size: "+ width +" * "+ height + ". crop: "+ crop);} mType = type; mWidth = width; mHeight = height; mYLenght = mWidth * mHeight; mCropHeight = (int) (crop. height () * mHeight); mCropWidth = (int) (crop. width () * mWidth); mCropHeight = roundTo16 (mCropHeight, mHeight); mCropWidth = roundTo16 (mCropWidth, mWidth); mCropLeft = (int) (crop. left * mWidth)/16*16; mCropTop = (int) (crop. top * mHeight)/16 * 16; mData = new byte [mCropHeight * mCropWidth * 3/2]; Log. d (LOG_TAG, "crop point:" + mCropLeft + "*" + mCropTop + "size:" + mCropWidth + "*" + mCropHeight );} /*** single-frame yuv data * @ param oriData * @ return */public byte [] crop (byte [] oriData) {if (oriData = null | oriData. length! = MYLenght * 3/2) {Log. d (LOG_TAG, "crop: wrong oriData !!! "); Return mData;} if (mType = YUV_420SP) {processYuvsp (oriData);} else if (mType = YUV_420P) {processYuv420p (oriData);} return mData ;} private void processYuvsp (byte [] oriData) {// copy y; int index = 0; int start = mCropLeft + mWidth * mCropTop; int end = mWidth * (mCropTop + mCropHeight ); int oriStep = mWidth; int newstep = mCropWidth; index = copy (oriData, start, end, oriStep, newstep, index); // Copy uv start = mYLenght + mWidth * mCropTop/2 + mCropLeft; end = mYLenght + mWidth * (mCropTop + mCropHeight)/2; oriStep = mWidth; newstep = mCropWidth; copy (oriData, start, end, oriStep, newstep, index);} private void processYuv420p (byte [] oriData) {int index = 0; int start = mCropLeft + mCropTop * mWidth; int end = mWidth * (mCropTop + mCropHeight); int oriStep = mWidth; int newstep = MCropWidth; // copy y; index = copy (oriData, start, end, oriStep, newstep, index ); // copy u start = mYLenght + (mWidth * mCropTop/4 + mCropLeft/2); end = mYLenght + mWidth * (mCropTop + mCropHeight)/4; oriStep = mWidth/2; newstep = mCropWidth/2; index = copy (oriData, start, end, oriStep, newstep, index ); // copy v start = mYLenght/4*5 + mWidth * mCropTop/4 + mCropLeft/2; end = mYL Enght/4*5 + mWidth * (mCropTop + mCropHeight)/4; copy (oriData, start, end, oriStep, newstep, index );} private int copy (byte [] oriData, int start, int end, int oriStep, int newstep, int index) {for (int I = start; I <end; I + = oriStep) {System. arraycopy (oriData, I, mData, index, newstep); index + = newstep;} return index;}/*** for Qualcomm or MTK platforms, only data in integer backup with a width of 16 * @ param size * @ param limit * @ re Turn */private int roundTo16 (int size, int limit) {if (size> = limit) {return limit;} float f = size/16f; int m; if (f-(int) f> 0.5f) {m = (int) (f + 0.5) * 16;} else {m = (int) f * 16 ;} return m <16? 16: m ;}}