yuv420sp-rgb24

typedef  enum  YUV420_FORMAT{
    YUV420_Y_U_V,
    YUV420_Y_UV,
}YUV420_FORMAT_E;


/****************************************************************************************************************
**          YUV420, Y_UV    format: Y0 Y1 Y2....  U0V0 U1V1 U2V2.......
**          YUV420, Y_U_V  format: Y0 Y1 Y2....  U0U1U2....    V0V1V2....
**          RGB format: B0G0R0 B1G1R1....
** *************************************************************************************************************/
static  void   YUVToRGB24(const unsigned char *pYUV, unsigned char *pRGB, int    W, int  H, YUV420_FORMAT_E  format)
{
    const  unsigned    char    *pY = NULL;
    const  unsigned    char    *pU = NULL;
    const  unsigned    char    *pV = NULL;
    unsigned    char    r, g, b;
    float       R, G, B;
    int     ycnt, ucnt, vcnt;
    int  size = 0;
    int     h = 0, w = 0;
    unsigned char *pbgr = pRGB;
    int     framesize = 0;
    int     offset = 0;
    int     skip = 0;


    if(YUV420_Y_UV==format)
        skip = 2;
    else if(YUV420_Y_U_V==format)
        skip = 1;
    else
        return;


    framesize = W*H;
    pY = pYUV;
    pU  = pY + framesize;
    pV = pU + 1;
    for(h=0;h<H;h++){
        for(w=0;w<W;w++){
            B = *pY + 2.03211*(*pU-128);
            G = *pY - 0.39465*(*pU-128) - 0.58060*(*pV-128);
            R = *pY + 1.113983*(*pV-128);


            if(R>255.0)
                R=255;
            if(R<0.0001)
                R=0;


            if(G>255.0)
                G=255;
            if(G<0.0001)
                G=0;


            if(B>255.0)
                B=255;
            if(B<0.0001)
                B=0;


            *pbgr++ = (unsigned char)B;
            *pbgr++ = (unsigned char)G;
            *pbgr++ = (unsigned char)R;


            offset = (h/2)*(W/2) + w/2;
            pU = pYUV + framesize + skip*offset;
            pV = pU + 1;
            //next pixel.
            pY++;
        }
    }
}

http://kuafu80.blog.163.com/blog/static/12264718020137230101434/

/*
YUV420 to RGB
输入：yData，uData，vData 分别为YUV缓冲起始地址,int nWidth,int nHeight为图像的宽和高
输出：pRgbBuf,RGB数据，排列为：R,G,B长度为： nWidthX nHeight


*/




void YUV2RGB(unsigned char* yData ,unsigned char* uData,unsigned char* vData ,int nWidth,int nHeight,unsigned char*  pRgbBuf)  
{  
static int Table_fv1[256]={ -180, -179, -177, -176, -174, -173, -172, -170, -169, -167, -166, -165, -163, -162, -160, -159, -158, -156, -155, -153, -152, -151, -149, -148, -146, -145, -144, -142, -141, -139, -138, -137, -135, -134, -132, -131, -130, -128, -127, -125, -124, -123, -121, -120, -118, -117, -115, -114, -113, -111, -110, -108, -107, -106, -104, -103, -101, -100, -99, -97, -96, -94, -93, -92, -90, -89, -87, -86, -85, -83, -82, -80, -79, -78, -76, -75, -73, -72, -71, -69, -68, -66, -65, -64, -62, -61, -59, -58, -57, -55, -54, -52, -51, -50, -48, -47, -45, -44, -43, -41, -40, -38, -37, -36, -34, -33, -31, -30, -29, -27, -26, -24, -23, -22, -20, -19, -17, -16, -15, -13, -12, -10, -9, -8, -6, -5, -3, -2, 0, 1, 2, 4, 5, 7, 8, 9, 11, 12, 14, 15, 16, 18, 19, 21, 22, 23, 25, 26, 28, 29, 30, 32, 33, 35, 36, 37, 39, 40, 42, 43, 44, 46, 47, 49, 50, 51, 53, 54, 56, 57, 58, 60, 61, 63, 64, 65, 67, 68, 70, 71, 72, 74, 75, 77, 78, 79, 81, 82, 84, 85, 86, 88, 89, 91, 92, 93, 95, 96, 98, 99, 100, 102, 103, 105, 106, 107, 109, 110, 112, 113, 114, 116, 117, 119, 120, 122, 123, 124, 126, 127, 129, 130, 131, 133, 134, 136, 137, 138, 140, 141, 143, 144, 145, 147, 148, 150, 151, 152, 154, 155, 157, 158, 159, 161, 162, 164, 165, 166, 168, 169, 171, 172, 173, 175, 176, 178 };  
static int Table_fv2[256]={ -92, -91, -91, -90, -89, -88, -88, -87, -86, -86, -85, -84, -83, -83, -82, -81, -81, -80, -79, -78, -78, -77, -76, -76, -75, -74, -73, -73, -72, -71, -71, -70, -69, -68, -68, -67, -66, -66, -65, -64, -63, -63, -62, -61, -61, -60, -59, -58, -58, -57, -56, -56, -55, -54, -53, -53, -52, -51, -51, -50, -49, -48, -48, -47, -46, -46, -45, -44, -43, -43, -42, -41, -41, -40, -39, -38, -38, -37, -36, -36, -35, -34, -33, -33, -32, -31, -31, -30, -29, -28, -28, -27, -26, -26, -25, -24, -23, -23, -22, -21, -21, -20, -19, -18, -18, -17, -16, -16, -15, -14, -13, -13, -12, -11, -11, -10, -9, -8, -8, -7, -6, -6, -5, -4, -3, -3, -2, -1, 0, 0, 1, 2, 2, 3, 4, 5, 5, 6, 7, 7, 8, 9, 10, 10, 11, 12, 12, 13, 14, 15, 15, 16, 17, 17, 18, 19, 20, 20, 21, 22, 22, 23, 24, 25, 25, 26, 27, 27, 28, 29, 30, 30, 31, 32, 32, 33, 34, 35, 35, 36, 37, 37, 38, 39, 40, 40, 41, 42, 42, 43, 44, 45, 45, 46, 47, 47, 48, 49, 50, 50, 51, 52, 52, 53, 54, 55, 55, 56, 57, 57, 58, 59, 60, 60, 61, 62, 62, 63, 64, 65, 65, 66, 67, 67, 68, 69, 70, 70, 71, 72, 72, 73, 74, 75, 75, 76, 77, 77, 78, 79, 80, 80, 81, 82, 82, 83, 84, 85, 85, 86, 87, 87, 88, 89, 90, 90 };  
static int Table_fu1[256]={ -44, -44, -44, -43, -43, -43, -42, -42, -42, -41, -41, -41, -40, -40, -40, -39, -39, -39, -38, -38, -38, -37, -37, -37, -36, -36, -36, -35, -35, -35, -34, -34, -33, -33, -33, -32, -32, -32, -31, -31, -31, -30, -30, -30, -29, -29, -29, -28, -28, -28, -27, -27, -27, -26, -26, -26, -25, -25, -25, -24, -24, -24, -23, -23, -22, -22, -22, -21, -21, -21, -20, -20, -20, -19, -19, -19, -18, -18, -18, -17, -17, -17, -16, -16, -16, -15, -15, -15, -14, -14, -14, -13, -13, -13, -12, -12, -11, -11, -11, -10, -10, -10, -9, -9, -9, -8, -8, -8, -7, -7, -7, -6, -6, -6, -5, -5, -5, -4, -4, -4, -3, -3, -3, -2, -2, -2, -1, -1, 0, 0, 0, 1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4, 4, 5, 5, 5, 6, 6, 6, 7, 7, 7, 8, 8, 8, 9, 9, 9, 10, 10, 11, 11, 11, 12, 12, 12, 13, 13, 13, 14, 14, 14, 15, 15, 15, 16, 16, 16, 17, 17, 17, 18, 18, 18, 19, 19, 19, 20, 20, 20, 21, 21, 22, 22, 22, 23, 23, 23, 24, 24, 24, 25, 25, 25, 26, 26, 26, 27, 27, 27, 28, 28, 28, 29, 29, 29, 30, 30, 30, 31, 31, 31, 32, 32, 33, 33, 33, 34, 34, 34, 35, 35, 35, 36, 36, 36, 37, 37, 37, 38, 38, 38, 39, 39, 39, 40, 40, 40, 41, 41, 41, 42, 42, 42, 43, 43 };  
static int Table_fu2[256]={ -227, -226, -224, -222, -220, -219, -217, -215, -213, -212, -210, -208, -206, -204, -203, -201, -199, -197, -196, -194, -192, -190, -188, -187, -185, -183, -181, -180, -178, -176, -174, -173, -171, -169, -167, -165, -164, -162, -160, -158, -157, -155, -153, -151, -149, -148, -146, -144, -142, -141, -139, -137, -135, -134, -132, -130, -128, -126, -125, -123, -121, -119, -118, -116, -114, -112, -110, -109, -107, -105, -103, -102, -100, -98, -96, -94, -93, -91, -89, -87, -86, -84, -82, -80, -79, -77, -75, -73, -71, -70, -68, -66, -64, -63, -61, -59, -57, -55, -54, -52, -50, -48, -47, -45, -43, -41, -40, -38, -36, -34, -32, -31, -29, -27, -25, -24, -22, -20, -18, -16, -15, -13, -11, -9, -8, -6, -4, -2, 0, 1, 3, 5, 7, 8, 10, 12, 14, 15, 17, 19, 21, 23, 24, 26, 28, 30, 31, 33, 35, 37, 39, 40, 42, 44, 46, 47, 49, 51, 53, 54, 56, 58, 60, 62, 63, 65, 67, 69, 70, 72, 74, 76, 78, 79, 81, 83, 85, 86, 88, 90, 92, 93, 95, 97, 99, 101, 102, 104, 106, 108, 109, 111, 113, 115, 117, 118, 120, 122, 124, 125, 127, 129, 131, 133, 134, 136, 138, 140, 141, 143, 145, 147, 148, 150, 152, 154, 156, 157, 159, 161, 163, 164, 166, 168, 170, 172, 173, 175, 177, 179, 180, 182, 184, 186, 187, 189, 191, 193, 195, 196, 198, 200, 202, 203, 205, 207, 209, 211, 212, 214, 216, 218, 219, 221, 223, 225 };  

long nYLen = nWidth * nHeight ;  
int nHfWidth = (nWidth>>1);  
int rgb[3];  
int i, j, m, n, x, y, pu, pv, py, rdif, invgdif, bdif;  
char addhalf = 1;  
m = -nWidth;  
n = -nHfWidth;  

for(y=0; y<nHeight;y++) 
{  
m += nWidth;  
if( addhalf )
{  
n+=nHfWidth;  
addhalf = 0;  
} else 
{  
addhalf = 1;  
}  
for(x=0; x<nWidth;x++) 
{  
i = m + x;  
j = n + (x>>1);  
py = yData[i];  
// search tables to get rdif invgdif and bidif  
rdif = Table_fv1[vData[j]];    // fv1  
invgdif = Table_fu1[uData[j]] + Table_fv2[vData[j]]; // fu1+fv2  
bdif = Table_fu2[uData[j]]; // fu2       
rgb[0] = py+rdif;    // R  
rgb[1] = py-invgdif; // G  
rgb[2] = py+bdif;    // B  
j = nYLen - nWidth - m + x;  
i = (j<<1) + j;  
// copy this pixel to rgb data  
for(j=0; j<3; j++)  
{  
if(rgb[j]>=0 && rgb[j]<=255)
{  
pRgbBuf[i + j] = rgb[j];  
}  
else
{  
pRgbBuf[i + j] = (rgb[j] < 0)? 0 : 255;  
}  
}  
}  
}  
return ;  
}