android 获取yuv数据格式,Android Camera提取出来的yuv420源数据怎么提取y、u、v分量啊~~~...

Camera默认的预览格式是 NV21，4:2:0 结构的，每个U、V用于4个Y

参考下下面的代码

**

* Converts YUV420 NV21 to ARGB8888

*

* @param data byte array on YUV420 NV21 format.

* @param width pixels width

* @param height pixels height

* @retur a ARGB8888 pixels int array. Where each int is a pixels ARGB.

*/

public static int[] convertYUV420_NV21toARGB8888(byte [] data, int width, int height) {

int size = width*height;

int offset = size;

int[] pixels = new int[size];

int u, v, y1, y2, y3, y4;

// i along Y and the final pixels

// k along pixels U and V

for(int i=0, k=0; i < size; i+=2, k+=1) {

y1 = data[i  ]&0xff;

y2 = data[i+1]&0xff;

y3 = data[width+i  ]&0xff;

y4 = data[width+i+1]&0xff;

v = data[offset+k  ]&0xff;

u = data[offset+k+1]&0xff;

v = v-128;

u = u-128;

pixels[i  ] = convertYUVtoARGB(y1, u, v);

pixels[i+1] = convertYUVtoARGB(y2, u, v);

pixels[width+i  ] = convertYUVtoARGB(y3, u, v);

pixels[width+i+1] = convertYUVtoARGB(y4, u, v);

if (i!=0 && (i+2)%width==0)

i+=width;

}

return pixels;

}

private static int convertYUVtoARGB(int y, int u, int v) {

int r,g,b;

r = y + (int)(1.402f*u);

g = y - (int)(0.344f*v + 0.714f*u);

b = y + (int)(1.772f*v);

r = r>255? 255 : r<0 ? 0 : r;

g = g>255? 255 : g<0 ? 0 : g;

b = b>255? 255 : b<0 ? 0 : b;

return 0xff000000 | (r<<16) | (g<<8) | b;

}