珠海品牌网站制作服务,网站图片布局,服装网站的建设,wordpress清新主题YUV是一种亮度信号Y和色度信号U、V是分离的色彩空间#xff0c;它主要用于优化彩色视频信号的传输#xff0c;使其向后相容老式黑白电视。其中“Y”表示明亮度#xff08;Luminance或Luma#xff09;#xff0c;也就是灰阶值#xff1b;而“U”和“V”表示的则是色度它主要用于优化彩色视频信号的传输使其向后相容老式黑白电视。其中“Y”表示明亮度Luminance或Luma也就是灰阶值而“U”和“V”表示的则是色度Chrominance或Chroma作用是描述影像色彩及饱和度用于指定像素的颜色。 YUV格式分为两种类型Packed类型和Planar类型。
1、Packed类型是将YUV分量存在在同一个数组中每个像素点的Y、U、V是连续交错存储的
2、Planar类型是将YUV分量分别存放到三个独立的数组中且先连续存储所有像素点的Y紧接着存储所有像素点的U最后是所有像素点的V。
一、将NV21转Yuv420p
// YYYYYYYY VUVU -- YYYYYYYY UVUV
// 将NV21转换为Yuv420sp
public static byte[] nv21ToYuv420sp(byte[] src, int width, int height) {int yLength width * height;int uLength yLength / 4;int vLength yLength / 4;int frameSize yLength uLength vLength;byte[] yuv420sp new byte[frameSize];// Y分量System.arraycopy(src, 0, yuv420sp, 0, yLength);for (int i 0; i yLength/4; i) {// U分量yuv420sp[yLength 2 * i] src[yLength 2*i1];// V分量yuv420sp[yLength 2*i1] src[yLength 2*i];}return yuv420sp;
}
二、将YUV420SemiPlanner转换为NV21
// YYYYYYYY UVUV(yuv420sp)-- YYYYYYYY VUVU(nv21)
// 将YUV420SemiPlanner转换为NV21
public static byte[] yuv420spToNV21(byte[] src, int width, int height) {int yLength width * height;int uLength yLength / 4;int vLength yLength / 4;int frameSize yLength uLength vLength;byte[] nv21 new byte[frameSize];// Y分量System.arraycopy(src, 0, nv21, 0, yLength);for (int i 0; i yLength/4; i) {// U分量nv21[yLength 2*i 1] src[yLength2*i];// V分量nv21[yLength 2*i] src[yLength 2*i 1];}return nv21;
}三、将YUV420PlannerI420转换为NV21
// YYYYYYYY UU VV -- YYYYYYYY VUVU
// 将YUV420PlannerI420转换为NV21
public static byte[] yuv420pToNV21(byte[] src, int width, int height) {int yLength width * height;int uLength yLength / 4;int vLength yLength / 4;int frameSize yLength uLength vLength;byte[] nv21 new byte[frameSize];System.arraycopy(src, 0, nv21, 0, yLength); // Y分量for (int i 0; i yLength / 4; i) {// U分量nv21[yLength 2*i 1] src[yLength i];// V分量nv21[yLength 2*i] src[yLength uLength i];}return nv21;
}
四、将nv21转换为yuv420p(I420)
// YYYYYYYY VUVU --- YYYYYYYY UU VV
//
public static byte[] nv21ToYuv420p(byte[] src, int width, int height) {int yLength width * height;int uLength yLength / 4;int vLength yLength / 4;int frameSize yLength uLength vLength;byte[] yuv420p new byte[frameSize];// Y分量System.arraycopy(src, 0, yuv420p, 0, yLength);for (int i 0; i yLength/4; i) {// U分量yuv420p[yLength i] src[yLength 2*i 1];// V分量yuv420p[yLength uLength i] src[yLength 2*i];}return yuv420p;
} 五、将YV12转换为NV21 // YYYYYYYY VV UU -- YYYYYYYY VUVU
// 将YV12转换为NV21
public static byte[] yv12ToNV21(byte[] src, int width, int height) {int yLength width * height;int uLength yLength / 4;int vLength yLength / 4;int frameSize yLength uLength vLength;byte[] nv21 new byte[frameSize];System.arraycopy(src, 0, nv21, 0, yLength); // Y分量for (int i 0; i yLength / 4; i) {// U分量nv21[yLength 2*i 1] src[yLength vLength i];// V分量nv21[yLength 2*i] src[yLength i];}return nv21;
}五种数据互相转换。 -END
