android - 在C++中从YUV转换为RGB(android-ndk)

我正在用android开发，并希望将字节数组从相机的YUV格式的PreviewCallback转换为rgb格式。

我已使用此答案中给出的功能:Getting frames from Video Image in Android

它在Java中完美地工作，但是我的问题是我想在c++中创建函数(我使用的是ndk，对c++不太熟悉)。

我试图用c++创建函数，但是它总是产生奇怪的结果(例如，图片全是绿色的)。

有没有人有类似的功能或此功能在c + +中工作？

谢谢。

最佳答案

在C++中从YUYV到RGB的转换:

unsigned char* rgb_image = new unsigned char[width * height * 3]; //width and height of the image to be converted

int y;
int cr;
int cb;

double r;
double g;
double b;

for (int i = 0, j = 0; i < width * height * 3; i+=6 j+=4) {
    //first pixel
    y = yuyv_image[j];
    cb = yuyv_image[j+1];
    cr = yuyv_image[j+3];

    r = y + (1.4065 * (cr - 128));
    g = y - (0.3455 * (cb - 128)) - (0.7169 * (cr - 128));
    b = y + (1.7790 * (cb - 128));

    //This prevents colour distortions in your rgb image
    if (r < 0) r = 0;
    else if (r > 255) r = 255;
    if (g < 0) g = 0;
    else if (g > 255) g = 255;
    if (b < 0) b = 0;
    else if (b > 255) b = 255;

    rgb_image[i] = (unsigned char)r;
    rgb_image[i+1] = (unsigned char)g;
    rgb_image[i+2] = (unsigned char)b;

    //second pixel
    y = yuyv_image[j+2];
    cb = yuyv_image[j+1];
    cr = yuyv_image[j+3];

    r = y + (1.4065 * (cr - 128));
    g = y - (0.3455 * (cb - 128)) - (0.7169 * (cr - 128));
    b = y + (1.7790 * (cb - 128));

    if (r < 0) r = 0;
    else if (r > 255) r = 255;
    if (g < 0) g = 0;
    else if (g > 255) g = 255;
    if (b < 0) b = 0;
    else if (b > 255) b = 255;

    rgb_image[i+3] = (unsigned char)r;
    rgb_image[i+4] = (unsigned char)g;
    rgb_image[i+5] = (unsigned char)b;
}

此方法还假定您的yuyv_image也是一个无符号的char *。

有关YUYV的更多信息，请参见here。

有关YUYV的更多说明-> RGB，请查看this