yuv420转rgb

最新推荐文章于 2019-07-25 10:01:23 发布

hzb1983

最新推荐文章于 2019-07-25 10:01:23 发布

阅读量4.1k

点赞数

CC 4.0 BY-SA版权

文章标签： table search

本文链接：https://blog.youkuaiyun.com/hzb1983/article/details/1798489

bool CHighEasyBrdSDK:: YUV2RGB(LPBYTE yuvBuf,UINT nWidth,UINT nHeight,LPBYTE pRgbBuf,unsigned long *len)
{

// int i, j;
// unsigned char*bufY, *bufU, *bufV, *bufRGB;
//
// bufY = yuvBuf;
// bufV = yuvBuf + nWidth * nHeight;
// bufU = yuvBuf + int(nWidth * nHeight* 5/4);
// *len = 0;
// unsigned char y, u, v, r, g, b,testu,testv;
// for( j = 0; j < nHeight; j++ )
// {
//   int templen = 0;
//   //从最低行的第一个RGB开始存放
//   //存完一行又开始存倒数第二，
//   bufRGB = pRgbBuf + nWidth * (nHeight - 1 - j) * 3 ;
//   for( i = 0; i < nWidth; i++ )
//   {
//    y = *(bufY + i + j * nWidth);
// //    if (i%2 ==0)
// //    {
// //     u = *(bufU++);
// //     v = *(bufV++);
// //    }
// //    else
// //    {
// //     u = *(bufU);
// //     v = *(bufV);
// //    }
//
//    u = *(bufU + (i>>1) +( j>>1)*nWidth/2 );
//    v = *(bufV + (i>>1) + (j>>1)*nWidth/2 );
//    r = y + 1.402 * (v-128);
//    g = y - 0.344 * (u-128) - 0.714 * (v-128);
//    b = y + 1.717 * (u-128);
//    *( bufRGB++ ) = unsigned char (b);//max( 0, min(r, 255 ) );
//    *( bufRGB++ ) = unsigned char (g);//max( 0, min( g, 255 ) );
//    *( bufRGB++ ) = unsigned char (r);//max( 0, min( b, 255 ) );
//   }
// }
// *len = 3*nWidth*nHeight;
// return true;
#define PIXELSIZE nWidth * nHeight

//========================================================================
const 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 };
const 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 };
const 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 };
const 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 };
*len = 3* nWidth * nHeight;

  if(!yuvBuf || !pRgbBuf)
   return false;

  const long nYLen = long(PIXELSIZE);
  const int nHfWidth = (nWidth>>1);

  if(nYLen<1 || nHfWidth<1)
   return false;

  // Y data
  unsigned char* yData = yuvBuf;
  // v data
  unsigned char* vData = &yData[nYLen];
  // u data
  unsigned char* uData = &vData[nYLen>>2];

  if(!uData || !vData)
   return false;

  int rgb[3];
  int i, j, m, n, x, y, pu, pv, py, rdif, invgdif, bdif;
  m = -nWidth;
  n = -nHfWidth;

  bool addhalf = true;
  for(y=0; y<nHeight;y++) {
   m += nWidth;
   if( addhalf ){
    n+=nHfWidth;
    addhalf = false;
   } else {
    addhalf = true;
   }
   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 true;

}