平面YUV422转平面RGB24 平面YUV420转平面YUV422 平面YUV420转RGB24

//平面YUV422转平面RGB24

static void YUV422p_to_RGB24(unsigned char *yuv422[3], unsigned char *rgb24, int width, int height)

{

int R,G,B,Y,U,V;

int x,y;

int nWidth = width>>1; //色度信号宽度

for (y=0;y<height;y++)

{

for (x=0;x<width;x++)

{

Y = *(yuv422[0] + y*width + x);

U = *(yuv422[1] + y*nWidth + (x>>1));

V = *(yuv422[2] + y*nWidth + (x>>1));

R = Y + 1.402*(V-128);

G = Y - 0.34414*(U-128) - 0.71414*(V-128);

B = Y + 1.772*(U-128);

//防止越界

if (R>255)R=255;

if (R<0)R=0;

if (G>255)G=255;

if (G<0)G=0;

if (B>255)B=255;

if (B<0)B=0;

*(rgb24 + ((height-y-1)*width + x)*3) = B;

*(rgb24 + ((height-y-1)*width + x)*3 + 1) = G;

*(rgb24 + ((height-y-1)*width + x)*3 + 2) = R;

}

}

}

//平面YUV420转平面YUV422

static void YUV420p_to_YUV422p(unsigned char *yuv420[3], unsigned char *yuv422, int width, int height)

{

int x, y;

//亮度信号Y复制

int Ylen = width*height;

memcpy(yuv422, yuv420[0], Ylen);

//色度信号U复制

unsigned char *pU422 = yuv422 + Ylen; //指向U的位置

int Uwidth = width>>1; //422色度信号U宽度

int Uheight = height>>1; //422色度信号U高度

for (y = 0; y < Uheight; y++)

{

memcpy(pU422 + y*width, yuv420[1] + y*Uwidth, Uwidth);

memcpy(pU422 + y*width + Uwidth, yuv420[1] + y*Uwidth, Uwidth);

}

//色度信号V复制

unsigned char *pV422 = yuv422 + Ylen + (Ylen>>1); //指向V的位置

int Vwidth = Uwidth; //422色度信号V宽度

int Vheight = Uheight; //422色度信号U宽度

for (y = 0; y < Vheight; y++)

{

memcpy(pV422 + y*width, yuv420[2] + y*Vwidth, Vwidth);

memcpy(pV422 + y*width + Vwidth, yuv420[2] + y*Vwidth, Vwidth);

}

}

//平面YUV420转RGB24

static void YUV420p_to_RGB24(unsigned char *yuv420[3], unsigned char *rgb24, int width, int height)

{

// int begin = GetTickCount();

int R,G,B,Y,U,V;

int x,y;

int nWidth = width>>1; //色度信号宽度

for (y=0;y<height;y++)

{

for (x=0;x<width;x++)

{

Y = *(yuv420[0] + y*width + x);

U = *(yuv420[1] + ((y>>1)*nWidth) + (x>>1));

V = *(yuv420[2] + ((y>>1)*nWidth) + (x>>1));

R = Y + 1.402*(V-128);

G = Y - 0.34414*(U-128) - 0.71414*(V-128);

B = Y + 1.772*(U-128);

//防止越界

if (R>255)R=255;

if (R<0)R=0;

if (G>255)G=255;

if (G<0)G=0;

if (B>255)B=255;

if (B<0)B=0;

*(rgb24 + ((height-y-1)*width + x)*3) = B;

*(rgb24 + ((height-y-1)*width + x)*3 + 1) = G;

*(rgb24 + ((height-y-1)*width + x)*3 + 2) = R;

// *(rgb24 + (y*width + x)*3) = B;

// *(rgb24 + (y*width + x)*3 + 1) = G;

// *(rgb24 + (y*width + x)*3 + 2) = R;

}

}

}