c-rgb到yuv420算法的效率

我写了一个算法来将RGB图像转换为YUV420.我花了很长时间试图让它更快,但我没有找到任何其他@L_944_1@提高其效率,所以现在我转向你,所以你可以告诉我,如果这是一样好,或者如果还有另一个更有效率这样做(算法是在C中,而C和汇编器也是选项)

namespace {
// lookup tables
int lookup_m_94[] = {
      0,-94,-188,-282,-376,-470,-564,-658,-752,-846,-940,-1034,-1128,-1222,-1316,-1410,-1504,-1598,-1692,-1786,-1880,-1974,-2068,-2162,-2256,-2350,-2444,-2538,-2632,-2726,-2820,-2914,-3008,-3102,-3196,-3290,-3384,-3478,-3572,-3666,-3760,-3854,-3948,-4042,-4136,-4230,-4324,-4418,-4512,-4606,-4700,-4794,-4888,-4982,-5076,-5170,-5264,-5358,-5452,-5546,-5640,-5734,-5828,-5922,-6016,-6110,-6204,-6298,-6392,-6486,-6580,-6674,-6768,-6862,-6956,-7050,-7144,-7238,-7332,-7426,-7520,-7614,-7708,-7802,-7896,-7990,-8084,-8178,-8272,-8366,-8460,-8554,-8648,-8742,-8836,-8930,-9024,-9118,-9212,-9306,-9400,-9494,-9588,-9682,-9776,-9870,-9964,-10058,-10152,-10246,-10340,-10434,-10528,-10622,-10716,-10810,-10904,-10998,-11092,-11186,-11280,-11374,-11468,-11562,-11656,-11750,-11844,-11938,-12032,-12126,-12220,-12314,-12408,-12@L_616_4@,-12596,-12690,-12784,-12878,-12972,-13066,-13160,-13254,-13348,-13442,-13536,-13630,-13724,-13818,-13912,-14006,-14100,-14194,-14288,-14382,-14476,-14570,-14664,-14758,-14852,-14946,-15040,-15134,-15228,-15322,-15416,-15510,-15604,-15698,-15792,-15886,-15980,-16074,-16168,-16262,-16356,-16450,-16544,-16638,-16732,-16826,-16920,-17014,-17108,-17202,-17296,-17390,-17484,-17578,-17672,-17766,-17860,-17954,-18048,-18142,-18236,-18330,-18424,-18518,-18612,-18706,-18800,-18894,-18988,-19082,-19176,-19270,-19364,-19458,-19552,-19646,-19740,-19834,-19928,-20022,-20116,-20210,-20304,-20398,-20492,-20586,-20680,-20774,-20868,-20962,-21056,-21150,-21244,-21338,-21432,-21526,-21620,-21714,-21808,-21902,-21996,-22090,-22184,-22278,-22372,-22466,-22560,-22654,-22748,-22842,-22936,-23030,-23124,-23218,-23312,-23406,-23500,-23594,-23688,-23782,-23876,-23970
};

int lookup_m_74[] = {
      0,-74,-148,-222,-296,-370,-444,-518,-592,-666,-740,-814,-888,-962,-1036,-1110,-1184,-1258,-1332,-1406,-1480,-1554,-1628,-1702,-1776,-1850,-1924,-1998,-2072,-2146,-2220,-2294,-2368,-2442,-2516,-2590,-2664,-2738,-2812,-2886,-2960,-3034,-3108,-3182,-3256,-3330,-3404,-3552,-3626,-3700,-3774,-3848,-3922,-3996,-4070,-4144,-4218,-4292,-4366,-4440,-4514,-4588,-4662,-4736,-4810,-4884,-4958,-5032,-5106,-5180,-5254,-5328,-5402,-5476,-5550,-5624,-5698,-5772,-5846,-5920,-5994,-6068,-6142,-6216,-6290,-6364,-6438,-6512,-6586,-6660,-6734,-6808,-6882,-7030,-7104,-7178,-7252,-7326,-7400,-7474,-7548,-7622,-7696,-7770,-7844,-7918,-7992,-8066,-8140,-8214,-8288,-8362,-8436,-8510,-8584,-8658,-8732,-8806,-8880,-8954,-9028,-9102,-9176,-9250,-9324,-9398,-9472,-9546,-9620,-9694,-9768,-9842,-9916,-9990,-10064,-10138,-10212,-10286,-10360,-10508,-10582,-10656,-10730,-10804,-10878,-10952,-11026,-11100,-11174,-11248,-11322,-11396,-11470,-11544,-11618,-11692,-11766,-11840,-11914,-11988,-12062,-12136,-12210,-12284,-12358,-12432,-12506,-12580,-12654,-12728,-12802,-12876,-12950,-13024,-13098,-13172,-13246,-13320,-13394,-13468,-13542,-13616,-13690,-13764,-13838,-13986,-14060,-14134,-14208,-14282,-14356,-14430,-14504,-14578,-14652,-14726,-14800,-14874,-14948,-1@L_616_4@2,-15096,-15170,-15244,-15318,-15392,-15466,-15540,-15614,-15688,-15762,-15836,-15910,-15984,-16058,-16132,-16206,-16280,-16354,-16428,-16@L_616_4@,-16576,-16650,-16724,-16798,-16872,-16946,-17020,-17094,-17168,-17242,-17316,-17464,-17538,-17612,-17686,-17760,-17834,-17908,-17982,-18056,-18130,-18204,-18278,-18352,-18426,-18500,-18574,-18648,-18722,-18796,-18870
};

int lookup_m_38[] = {
      0,-38,-76,-114,-152,-190,-228,-266,-304,-342,-380,-418,-456,-494,-532,-570,-608,-646,-684,-722,-760,-798,-836,-874,-912,-950,-988,-1026,-1064,-1102,-1140,-1178,-1216,-1254,-1292,-1330,-1368,-1444,-1482,-1520,-1558,-1596,-1634,-1672,-1710,-1748,-1824,-1862,-1900,-1938,-1976,-2014,-2052,-2090,-2128,-2166,-2204,-2242,-2280,-2318,-2356,-2394,-2432,-2470,-2508,-2546,-2584,-2622,-2660,-2698,-2736,-2774,-2850,-2888,-2926,-2964,-3002,-3040,-3078,-3116,-3154,-3192,-3230,-3268,-3306,-3344,-3382,-3420,-3458,-3496,-3534,-3610,-3648,-3686,-3724,-3762,-3800,-3838,-3876,-3914,-3952,-3990,-4028,-4066,-4104,-4142,-4180,-4256,-4294,-4332,-4370,-4408,-4446,-4484,-4522,-4560,-4598,-4636,-4674,-4712,-4750,-4788,-4826,-4864,-4902,-4940,-4978,-5016,-5054,-5092,-5130,-5168,-5206,-5244,-5282,-5320,-5396,-5434,-5472,-5510,-5548,-5586,-5662,-5700,-5738,-5776,-5814,-5852,-5890,-5928,-5966,-6004,-6042,-6080,-6118,-6156,-6194,-6232,-6270,-6308,-6346,-6384,-6422,-6460,-6498,-6536,-6574,-6612,-6650,-6688,-6726,-6764,-6802,-6840,-6878,-6916,-6954,-6992,-7068,-7106,-7182,-7220,-7258,-7296,-7334,-7372,-7410,-7448,-7486,-7524,-7562,-7600,-7638,-7676,-7714,-7752,-7790,-7828,-7866,-7904,-7942,-7980,-8018,-8056,-8094,-8132,-8170,-8208,-8246,-8284,-8322,-8360,-8398,-8474,-8512,-8550,-8588,-8626,-8664,-8702,-8740,-8778,-8816,-8854,-8892,-8968,-9006,-9044,-9082,-9120,-9158,-9196,-9234,-9272,-9310,-9348,-9386,-9424,-9462,-9500,-9538,-9576,-9614,-9652,-9690
};

int lookup_m_18[] = {
      0,-18,-36,-54,-72,-90,-108,-126,-144,-162,-180,-198,-216,-234,-252,-270,-288,-306,-324,-360,-378,-396,-414,-432,-450,-468,-486,-504,-522,-540,-558,-576,-594,-612,-630,-648,-702,-720,-738,-756,-774,-792,-810,-828,-864,-882,-900,-918,-936,-954,-972,-990,-1008,-1044,-1062,-1080,-1098,-1116,-1134,-1152,-1170,-1188,-1206,-1224,-1242,-1260,-1278,-1296,-1314,-1350,-1386,-1404,-1422,-1440,-1458,-1476,-1494,-1512,-1530,-1548,-1566,-1584,-1602,-1620,-1638,-1656,-1674,-1728,-1746,-1764,-1782,-1800,-1818,-1836,-1854,-1872,-1890,-1908,-1926,-1944,-1962,-1980,-2016,-2034,-2070,-2088,-2106,-2124,-2142,-2160,-2178,-2196,-2214,-2232,-2250,-@R_450_10111@,-2286,-2304,-2322,-2340,-2358,-2376,-2412,-2430,-2448,-2466,-2484,-2@L_616_4@,-2520,-2556,-2574,-2592,-2610,-2628,-2646,-2682,-2700,-2718,-2754,-2772,-2790,-2808,-2826,-2844,-2862,-2880,-2898,-2916,-2934,-2952,-2970,-2988,-3006,-3024,-3042,-3060,-3096,-3114,-3132,-3150,-3168,-3186,-3204,-3222,-3240,-3258,-3276,-3294,-3312,-3348,-3366,-3402,-3438,-3456,-3474,-3492,-3510,-3528,-3546,-3564,-3582,-3600,-3618,-3636,-3654,-3672,-3690,-3708,-3726,-3744,-3780,-3798,-3816,-3834,-3852,-3870,-3888,-3906,-3924,-3942,-3960,-3978,-4014,-4032,-4050,-4068,-4086,-4122,-4140,-4158,-4176,-4194,-4212,-4248,-4266,-4284,-4302,-4320,-4338,-4356,-4374,-4392,-4410,-4428,-4464,-4482,-4500,-4518,-4536,-4554,-4572,-4590
};

int lookup25[] = {
      0,25,50,75,100,125,150,175,200,225,250,275,300,325,350,375,400,425,450,475,500,525,550,575,600,625,650,675,700,725,750,775,800,825,850,875,900,925,950,975,1000,1025,1050,1075,1100,1125,1150,1175,1200,1225,1250,1275,1300,1325,1350,1375,1400,1425,1450,1475,1500,1525,1550,1575,1600,1625,1650,1675,1700,1725,1750,1775,1800,1825,1850,1875,1900,1925,1950,1975,2000,2025,2050,2075,2100,2125,2150,2175,2200,2225,2250,2275,2300,2325,2350,2375,2400,2425,2450,2475,2500,2525,2550,2575,2600,2625,2650,2675,2700,2725,2750,2775,2800,2825,2850,2875,2900,2925,2950,2975,3000,3025,3050,3075,3100,3125,3150,3175,3200,3225,3250,3275,3300,3325,3350,3375,3400,3425,3450,3475,3500,3525,3550,3575,3600,3625,3650,3675,3700,3725,3750,3775,3800,3825,3850,3875,3900,3925,3950,3975,4000,4025,4050,4075,4100,4125,4150,4175,4200,4225,4250,4275,4300,4325,4350,4375,4400,4425,4450,4475,4500,4525,4550,4575,4600,4625,4650,4675,4700,4725,4750,4775,4800,4825,4850,4875,4900,4925,4950,4975,5000,@L_616_4@5,5050,5075,5100,5125,5150,5175,5200,5225,5250,5275,5300,5325,5350,5375,5400,5425,5450,5475,5500,5525,5550,5575,5600,5625,5650,5675,5700,5725,5750,5775,5800,5825,5850,5875,5900,5925,5950,5975,6000,6025,6050,6075,6100,6125,6150,6175,6200,6225,6250,6275,6300,6325,6350,6375
};

int lookuP66[] = {
      0,66,132,198,264,330,396,462,528,594,660,726,792,858,924,990,1056,1122,1188,1254,1320,1386,1452,1518,1584,1716,1782,1848,1914,1980,2046,2112,2178,2244,2310,2376,2442,2508,2574,2640,2706,2772,2838,2904,2970,3036,3102,3168,3234,3366,3432,3498,3564,3630,3696,3762,3828,3894,3960,4026,4092,4158,4224,4290,4356,4422,4488,4554,4620,4686,4752,4818,4884,5016,5082,5148,5214,5280,5346,5412,5478,5544,5610,5676,5742,5808,5874,5940,6006,6072,6138,6204,6270,6336,6402,6468,6534,6600,6666,6732,6798,6864,6930,6996,7062,7128,7194,7260,7326,7392,7458,7524,7590,7656,7722,7788,7854,7920,7986,8052,8118,8184,8250,8316,8382,8448,8514,8580,8646,8712,8778,8844,8910,8976,9042,9108,9174,9240,9306,9372,9438,9504,9570,9636,9702,9768,9834,9900,9966,10032,10098,10164,10230,10296,10362,10428,10494,10560,10626,10692,10758,10824,10890,10956,11022,11088,11154,11220,11286,11352,11418,11484,11550,11616,11682,11748,11814,11880,11946,12012,12078,12144,12210,12276,12342,12408,12474,12540,12606,12672,12738,12804,12870,12936,13002,13068,13134,13200,13266,13332,13398,13464,13530,13596,13662,13728,13794,13860,13926,13992,14058,14124,14190,14256,14322,14388,14454,14520,14586,14652,14718,14784,14850,14916,14982,15048,15114,15180,15246,15312,15378,15444,15510,15576,15642,15708,15774,15840,15906,15972,16038,16104,16170,16236,16302,16368,16434,16500,16566,16632,16698,16764,16830
};

int lookup112[] = {
      0,112,224,336,448,560,672,784,896,1008,1120,1232,1344,1456,1568,1680,1792,1904,2016,2128,2240,2352,2464,2576,2688,2912,3024,3136,3248,3360,3472,3584,3808,3920,4032,4144,4256,4368,4480,4592,4704,4816,4928,5040,5152,5264,5376,5488,5712,5824,5936,6048,6160,6272,6384,6496,6608,6720,6832,6944,7056,7168,7280,7504,7616,7728,7840,7952,8064,8176,8288,8400,8512,8624,8736,8848,8960,9072,9184,9296,9408,9520,9632,9744,9856,9968,10080,10192,10304,10416,10528,10640,10752,10864,10976,11200,11312,11424,11536,11648,11760,11872,11984,12096,12208,12320,12432,12544,12656,12768,12880,12992,13104,13216,13328,13440,13552,13664,13776,13888,14000,14112,14224,14336,14448,14560,14672,14896,15008,15120,15232,15344,15456,15568,15680,15792,15904,16016,16128,16240,16352,16464,16576,16688,16800,16912,17024,17136,17248,17360,17472,17584,17696,17808,17920,18032,18144,18256,18368,18480,18592,18704,18816,18928,19040,19152,19264,19376,19488,19600,19712,19824,19936,20048,20160,20272,20384,20496,20608,20720,20832,20944,21056,21168,21280,21392,21504,21616,21728,21840,21952,22064,22176,22288,22400,22512,22624,22736,22848,22960,23072,23184,23296,23408,23520,23632,23744,23856,23968,24080,24192,24304,24416,24528,24640,24752,24864,24976,25088,25200,25312,25424,25536,25648,25760,25872,25984,26096,26208,26320,26432,26544,26656,26768,26880,26992,27104,27216,27328,27440,27552,27664,27776,27888,28000,28112,28224,28336,28448,28560
};

int lookup129[] = {
      0,129,258,387,516,645,774,903,1032,1161,1290,1419,1548,1677,1806,1935,2064,2193,2322,2451,2580,2709,2967,3096,3354,3483,3612,3741,3870,3999,4128,4257,4386,4515,4644,4773,4902,5031,5160,5289,5418,5547,5805,5934,6063,6192,6321,6450,6579,6708,6837,6966,7095,7224,7353,7482,7611,7740,7869,7998,8127,8256,8385,8643,8772,8901,9030,9159,9288,9417,9546,9675,9804,9933,10062,10191,10320,10449,10578,10707,10836,10965,11094,11223,11481,11610,11739,11868,11997,12126,12255,12384,12513,12642,12771,12900,13029,13158,13287,13416,13545,13674,13803,13932,14061,14319,14577,14706,14835,14964,15093,15222,15351,15480,15609,15738,15867,15996,16125,16254,16383,16512,16641,16770,16899,17028,17157,17286,17415,17544,17673,17802,17931,18060,18189,18318,18447,18576,18705,18834,18963,19092,19221,19350,19479,19608,19737,19866,19995,20124,20253,20382,20511,20640,20769,20898,21027,21156,21285,21414,21543,21672,21801,21930,22059,22188,22317,22446,22575,22704,22833,22962,23091,23220,23349,23478,23607,23736,23865,23994,24123,24252,24381,24510,24639,24768,24897,2@L_616_4@6,25155,25284,25413,25542,25671,25800,25929,26058,26187,26316,26445,26574,26703,26832,26961,27090,27219,27348,27477,27606,27735,27864,27993,28122,28251,28380,28509,28638,28767,28896,29025,29154,29283,29412,29541,29670,29799,29928,30057,30186,30315,30444,30573,30702,30831,30960,31089,31218,31347,31476,31605,31734,31863,31992,32121,32250,32379,32508,32637,32766,32895
};
}

void Bitmap2Yuv420p(boost::uint8_t *desTination,boost::uint8_t *rgb,const int &width,const int &height) {
  boost::uint8_t *y;
  boost::uint8_t *u;
  boost::uint8_t *v;

  boost::uint8_t *r;
  boost::uint8_t *g;
  boost::uint8_t *b;

  std::size_t image_size = width * height;
  std::size_t upos = image_size;
  std::size_t vpos = upos + upos / 4;
  for (std::size_t i = 0; i < image_size; ++i) {
    r = rgb + 3 * i;
    g = rgb + 3 * i + 1;
    b = rgb + 3 * i + 2;
    y = desTination + i;
    *y = ((lookuP66[*r] + lookup129[*g] + lookup25[*b]) >> 8) + 16;
    if (!((i / width) % 2) && !(i % 2)) {
      u = desTination + upos++;
      v = desTination + vpos++;
      *u = ((lookup_m_38[*r] + lookup_m_74[*g] + lookup112[*b]) >> 8) + 128;
      *v = ((lookup112[*r] + lookup_m_94[*g] + lookup_m_18[*b]) >> 8) + 128;
    }
  }
}

void Bitmap2Yuv420p_calc2(uint8_t *desTination,uint8_t *rgb,size_t width,size_t height)
{
    size_t image_size = width * height;
    size_t upos = image_size;
    size_t vpos = upos + upos / 4;
    size_t i = 0;

    for( size_t line = 0; line < height; ++line )
    {
        if( !(line % 2) )
        {
            for( size_t x = 0; x < width; x += 2 )
            {
                uint8_t r = rgb[3 * i];
                uint8_t g = rgb[3 * i + 1];
                uint8_t b = rgb[3 * i + 2];

                desTination[i++] = ((66*r + 129*g + 25*b) >> 8) + 16;

                desTination[upos++] = ((-38*r + -74*g + 112*b) >> 8) + 128;
                desTination[vpos++] = ((112*r + -94*g + -18*b) >> 8) + 128;

                r = rgb[3 * i];
                g = rgb[3 * i + 1];
                b = rgb[3 * i + 2];

                desTination[i++] = ((66*r + 129*g + 25*b) >> 8) + 16;
            }
        }
        else
        {
            for( size_t x = 0; x < width; x += 1 )
            {
                uint8_t r = rgb[3 * i];
                uint8_t g = rgb[3 * i + 1];
                uint8_t b = rgb[3 * i + 2];

                desTination[i++] = ((66*r + 129*g + 25*b) >> 8) + 16;
            }
        }
    }
}