关于图像处理:YUVyuv422yuv420pyuv420sp-convert-to-RGB

    void convert_yuv420p_to_rgb_buffer(unsigned char* yuv, unsigned char* rgb, unsigned int width, unsigned int height)    {        int y, u, v;        int r, g, b;        unsigned char* rgbPixel = rgb;        unsigned char* yuvPixel = yuv;        unsigned char* uHeader = yuv + width * height;        unsigned char* vHeader = yuv + width * height + (width * height) / 4;        int half_width = width / 2;        for (int j = 0; j < height; j++) {            for (int i = 0; i < width; i++) {                y = *yuvPixel;                yuvPixel++;                u = *(uHeader + (i / 2 + (j / 2 * half_width)));                 v = *(vHeader + (i / 2 + (j / 2 * half_width)));                // yuv to rgb, 整数、移位， 缩小计算量                r = y + ((360 * (v - 128)) >> 8);                r = r > 255 ? 255 : (r < 0 ? 0 : r);                *rgbPixel = r;                rgbPixel++;                g = y - (((88 * (u - 128) + 184 * (v - 128))) >> 8);                g = g > 255 ? 255 : (g < 0 ? 0 : g);                *rgbPixel = g;                rgbPixel++;                b = y + ((455 * (u - 128)) >> 8);                b = b > 255 ? 255 : (b < 0 ? 0 : b);                *rgbPixel = b;                rgbPixel++;            }        }    }

    void convert_yuv420sp_to_rgb_buffer(unsigned char* yuv, unsigned char* rgb, unsigned int width, unsigned int height)    {        int y, u, v;        int r, g, b;        unsigned char* rgbPixel = rgb;        unsigned char* yuvPixel = yuv;        unsigned char* uHeader = yuv + width * height;        //unsigned char* vHeader = yuv + width * height + (width * height) / 4;        int half_width = width / 2;        for (int j = 0; j < height; j++) {            for (int i = 0; i < width; i++) {                y = *yuvPixel;                yuvPixel++;                u = *(uHeader + (i / 2 + (j / 2 * half_width)) * 2);  // 留神： 因为是整数乘除， 这里 (i / 2 * 2) 不肯定都等于 i, 不要简化。                v = *(uHeader + (i / 2 + (j / 2 * half_width)) * 2+1);                // yuv to rgb, 整数、移位， 缩小计算量                r = y + ((360 * (v - 128)) >> 8);                r = r > 255 ? 255 : (r < 0 ? 0 : r);                *rgbPixel = r;                rgbPixel++;                g = y - (((88 * (u - 128) + 184 * (v - 128))) >> 8);                g = g > 255 ? 255 : (g < 0 ? 0 : g);                *rgbPixel = g;                rgbPixel++;                b = y + ((455 * (u - 128)) >> 8);                b = b > 255 ? 255 : (b < 0 ? 0 : b);                *rgbPixel = b;                rgbPixel++;            }        }    }

    void convert_yuyv_to_rgb_buffer(unsigned char* yuv, unsigned char* rgb, unsigned int width, unsigned int height)    {        unsigned int i;        unsigned char* rgbPixel = rgb;        unsigned char* yuvPixel = yuv;        int y0, u, y1, v;        int r, g, b;        for (i = 0; i < width * height / 2; i++) {            y0 = *yuvPixel;            yuvPixel++;            u = *yuvPixel;            yuvPixel++;            y1 = *yuvPixel;            yuvPixel++;            v = *yuvPixel;            yuvPixel++;            // yuv to rgb, 整数、移位， 缩小计算量            r = y0 + ((360 * (v - 128)) >> 8);            r = r > 255 ? 255 : (r < 0 ? 0 : r);            *rgbPixel = r;            rgbPixel++;            g = y0 - (((88 * (u - 128) + 184 * (v - 128))) >> 8);            g = g > 255 ? 255 : (g < 0 ? 0 : g);            *rgbPixel = g;            rgbPixel++;            b = y0 + ((455 * (u - 128)) >> 8);            b = b > 255 ? 255 : (b < 0 ? 0 : b);            *rgbPixel = b;            rgbPixel++;            // yuv to rgb, 整数、移位， 缩小计算量            r = y1 + ((360 * (v - 128)) >> 8);            r = r > 255 ? 255 : (r < 0 ? 0 : r);            *rgbPixel = r;            rgbPixel++;            g = y1 - (((88 * (u - 128) + 184 * (v - 128))) >> 8);            g = g > 255 ? 255 : (g < 0 ? 0 : g);            *rgbPixel = g;            rgbPixel++;            b = y1 + ((455 * (u - 128)) >> 8);            b = b > 255 ? 255 : (b < 0 ? 0 : b);            *rgbPixel = b;            rgbPixel++;        }    }