package com.whyc.util;
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import android.media.Image;
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public class YUVUtil {
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public static void YUVToNV21_NV12(Image image, byte[] nv21, int w, int h, String type) {
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Image.Plane[] planes = image.getPlanes();
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int remaining0 = planes[0].getBuffer().remaining();
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int remaining1 = planes[1].getBuffer().remaining();
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int remaining2 = planes[2].getBuffer().remaining();
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//分别准备三个数组接收YUV分量。
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byte[] yRawSrcBytes = new byte[remaining0];
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byte[] uRawSrcBytes = new byte[remaining1];
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byte[] vRawSrcBytes = new byte[remaining2];
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planes[0].getBuffer().get(yRawSrcBytes);
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planes[1].getBuffer().get(uRawSrcBytes);
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planes[2].getBuffer().get(vRawSrcBytes);
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int j = 0, k = 0;
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boolean flag = type.equals("NV21");
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if (type.equals("NV21") || type.equals("NV12")) {
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for (int i = 0; i < nv21.length; i++) {
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if (i < w * h) {
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//首先填充w*h个Y分量
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nv21[i] = yRawSrcBytes[i];
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} else {
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if (flag) {
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//若NV21类型 则Y分量分配完后第一个将是V分量
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nv21[i] = vRawSrcBytes[j];
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//PixelStride有用数据步长 = 1紧凑按顺序填充，=2每间隔一个填充数据
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j += planes[1].getPixelStride();
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} else {
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//若NV12类型 则Y分量分配完后第一个将是U分量
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nv21[i] = uRawSrcBytes[k];
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//PixelStride有用数据步长 = 1紧凑按顺序填充，=2每间隔一个填充数据
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k += planes[2].getPixelStride();
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}
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//紧接着可以交错UV或者VU排列不停的改变flag标志即可交错排列
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flag = !flag;
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}
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}
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}else{ //I420标准结构Plannar,YUV分量首先存放w * h 个Y,接着存放 w * h * 0.25 个U最后存放 w * h * 0.25 个V
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for (int i = 0; i < nv21.length; i++) {
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if (i < w * h) {
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//首先填充w*h个Y分量
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nv21[i] = yRawSrcBytes[i];
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} else if (i < w * h * 5 / 4) {
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nv21[i] = uRawSrcBytes[j];
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j += planes[1].getPixelStride();
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} else {
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nv21[i] = vRawSrcBytes[k];
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k += planes[2].getPixelStride();
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}
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}
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}
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}
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}
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