YUV420转RGB的代码(C++/JAVA)

Android中MediaCodec解码出来的是YUV420数据, 转换成RGB的C++代码如下:

static uchar pBGR24[MAX_BUF_SIZE];

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 };

QImage YUVtoRGB::YV12ToBGR24_Table(unsigned char* pYUV,int width,int height)
{
    if (width < 1 || height < 1 || pYUV == NULL || pBGR24 == NULL)
        return QImage();
    const long len = width * height;
    unsigned char* yData = pYUV;
    unsigned char* vData = &yData[len];
    unsigned char* uData = &vData[len >> 2];

    memset(pBGR24, 0, MAX_BUF_SIZE);

    int bgr[3];
    int yIdx,uIdx,vIdx,idx;
    int rdif,invgdif,bdif;
    for (int i = 0;i < height;i++){
        for (int j = 0;j < width;j++){
            yIdx = i * width + j;
            vIdx = (i/2) * (width/2) + (j/2);
            uIdx = vIdx;

            rdif = Table_fv1[vData[vIdx]];
            invgdif = Table_fu1[uData[uIdx]] + Table_fv2[vData[vIdx]];
            bdif = Table_fu2[uData[uIdx]];

            bgr[0] = yData[yIdx] + bdif;
            bgr[1] = yData[yIdx] - invgdif;
            bgr[2] = yData[yIdx] + rdif;

            for (int k = 0;k < 3;k++){
                idx = (i * width + j) * 3 + k;
                if(bgr[k] >= 0 && bgr[k] <= 255)
                    pBGR24[idx] = bgr[k];
                else
                    pBGR24[idx] = (bgr[k] < 0)?0:255;
            }
        }
    }
    QImage tmpImage(pBGR24,800,480,QImage::Format_RGB888);

//    return true;
    return tmpImage.copy();
}

QImage YUVtoRGB::YV12ToBGR24_Native(uchar* pYUV,int width,int height)
{
    if (width < 1 || height < 1 || pYUV == NULL || pBGR24 == NULL)
        return QImage();
    const long len = width * height;
    unsigned char* yData = pYUV;
    unsigned char* vData = &yData[len];
    unsigned char* uData = &vData[len >> 2];

    memset(pBGR24, 0, MAX_BUF_SIZE);

    int bgr[3];
    int yIdx,uIdx,vIdx,idx;
    for (int i = 0;i < height;i++){
        for (int j = 0;j < width;j++){
            yIdx = i * width + j;
            vIdx = (i/2) * (width/2) + (j/2);
            uIdx = vIdx;

            bgr[0] = (int)(yData[yIdx] + 1.732446 * (uData[vIdx] - 128));                                    // b分量
            bgr[1] = (int)(yData[yIdx] - 0.698001 * (uData[uIdx] - 128) - 0.703125 * (vData[vIdx] - 128));    // g分量
            bgr[2] = (int)(yData[yIdx] + 1.370705 * (vData[uIdx] - 128));                                    // r分量

            for (int k = 0;k < 3;k++){
                idx = (i * width + j) * 3 + k;
                if(bgr[k] >= 0 && bgr[k] <= 255)
                    pBGR24[idx] = bgr[k];
                else
                    pBGR24[idx] = (bgr[k] < 0)?0:255;
            }
        }
    }

    QImage tmpImage(pBGR24,800,480,QImage::Format_RGB888);

//    return true;
    return tmpImage.copy();
}

这里是在QT中将YUV的数据转成RGB, 然后保存为一张QImage的图.
YV12ToBGR24_Native 以时间换空间;
YV12ToBGR24_Table 以空间换时间;

---

相对应的JAVA代码:

    static byte[] data = new byte[1024*1024*2];
    private static int R = 0;
    private static int G = 1;
    private static int B = 2;
    private static class RGB{
        public int r, g, b;
    }
    private static RGB yuvTorgb(byte Y, byte U, byte V){
        RGB rgb = new RGB();
        rgb.r = (int)((Y&0xff) + 1.732446 * ((U&0xff)-128));
        rgb.g = (int)((Y&0xff) - 0.698001 * ((U&0xff)-128) - 0.703125*((V&0xff)-128));
        rgb.b = (int)((Y&0xff) + 1.370705 * ((V&0xff)-128));
        rgb.r =(rgb.r<0? 0: rgb.r>255? 255 : rgb.r);
        rgb.g =(rgb.g<0? 0: rgb.g>255? 255 : rgb.g);
        rgb.b =(rgb.b<0? 0: rgb.b>255? 255 : rgb.b);
        return rgb;
    }
    public static byte[] YV12ToRGB(byte[] src, int width, int height){
        int numOfPixel = width * height;
        int positionOfV = numOfPixel;
        int positionOfU = numOfPixel/4 + numOfPixel;
        byte[] rgb = new byte[numOfPixel*3];

        for(int i=0; iint startY = i*width;
            int step = (i/2)*(width/2);
            int startV = positionOfV + step;
            int startU = positionOfU + step;
            for(int j = 0; j < width; j++){
                int Y = startY + j;
                int V = startV + j/2;
                int U = startU + j/2;
                int index = Y*3;

                //rgb[index+R] = (int)((src[Y]&0xff) + 1.4075 * ((src[V]&0xff)-128));
                //rgb[index+G] = (int)((src[Y]&0xff) - 0.3455 * ((src[U]&0xff)-128) - 0.7169*((src[V]&0xff)-128));
                //rgb[index+B] = (int)((src[Y]&0xff) + 1.779 * ((src[U]&0xff)-128));
                RGB tmp = yuvTorgb(src[Y], src[U], src[V]);
                rgb[index+R] = (byte)tmp.r;
                rgb[index+G] = (byte)tmp.g;
                rgb[index+B] = (byte)tmp.b;
            }
        }
        return rgb;
    }
    private static final int[] Table_fv1 = { -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 };
    private static final int[] Table_fv2 = { -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 };
    private static final int[] Table_fu1 = { -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 };
    private static final int[] Table_fu2 = { -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 };
    public static byte[] YV12ToRGB_Table(byte[] pYV12, int width, int height){
        final int nYLen =  width * height ;
        final int nHfWidth = (width>>1);
        byte[] pRGB24 = new byte[nYLen*3];

        // Y data
        //unsigned char* yData = pYV12;
        byte[] yData = new byte[pYV12.length];
        for(int i=0;i// v data
        //unsigned char* vData = &yData[nYLen];
        byte[] vData = new byte[yData.length - nYLen];
        for(int i=0;i// u data
        //unsigned char* uData = &vData[nYLen>>2];
        byte[] uData = new byte[vData.length - (nYLen>>2)];
        for(int i=0;i>2) + i];
        }
//        if( uData.length == 0  ||  vData.length == 0)
//            return false;
        //int rgb[3];
        int[] rgb = new int[3];
        int i, j, m, n, x, y, pu, pv, py, rdif, invgdif, bdif;
        int k, idx;
        m = -width;
        n = -nHfWidth;
        //--------------------------------------
        boolean addhalf = true;
        for(y=0; yif( addhalf ){
                n+=nHfWidth;
                addhalf = false;
            } else {
                addhalf = true;
            }
            for(x=0; x>1);

                py = (int)((yData[i] + 256)%256);

                // search tables to get rdif invgdif and bidif
                rdif = Table_fv1[(int)((vData[j] + 256)%256)];    // fv1
                invgdif = Table_fu1[(int)((uData[j]+ 256)%256)] + Table_fv2[(int)((vData[j] + 256)%256)]; // fu1+fv2
                bdif = Table_fu2[(int)((uData[j] + 256)%256)]; // fu2

                rgb[2] = py+rdif;    // R
                rgb[1] = py-invgdif; // G
                rgb[0] = py+bdif;    // B

                // copy this pixel to rgb data
                idx = (y * width + x) * 3;
                for(k=0; k<3; k++)
                    pRGB24[idx + k] = (byte)(rgb[k]<0? 0: rgb[k]>255? 255 : rgb[k]);
            }
        }
        return pRGB24;
    }