雷霄骅在 /leixiaohua1020/article/details/40266503 一文中提到了yuv转rgb的代码，通过简单的改造，就可以直观的看出yuv的模样。
测试rgb的渲染。
改动CONVERT_YUV420PtoRGB24 的代码如下。
void CONVERT_YUV420PtoRGB24(unsigned char* yuv_src, unsigned char* rgb_dst, int nWidth, int nHeight){unsigned char Y, U, V, R, G, B;unsigned char* y_planar, * u_planar, * v_planar;int offSet = 0;int rgb_width = nWidth * 3;int ypSize = nWidth * nHeight;int upSize = (ypSize >> 2); y_planar = yuv_src;u_planar = yuv_src + ypSize;v_planar = u_planar + upSize;for (int i = 0; i < nHeight; i++){for (int j = 0; j < nWidth; j++){R = 255;G = 0;B = 0;offSet = rgb_width * i + j * 3;rgb_dst[offSet] = B;rgb_dst[offSet + 1] = G;rgb_dst[offSet + 2] = R;}}}
期待的结果为整个窗口为红色。
只渲染yuv中的y数据。
改动CONVERT_YUV420PtoRGB24 的代码如下。
void CONVERT_YUV420PtoRGB24(unsigned char* yuv_src, unsigned char* rgb_dst, int nWidth, int nHeight){unsigned char Y, U, V, R, G, B;unsigned char* y_planar, * u_planar, * v_planar;int offSet = 0;int rgb_width = nWidth * 3;int ypSize = nWidth * nHeight;int upSize = (ypSize >> 2);y_planar = yuv_src;u_planar = yuv_src + ypSize;v_planar = u_planar + upSize;for (int i = 0; i < nHeight; i++){for (int j = 0; j < nWidth; j++){Y = *(y_planar + nWidth * i + j);R = Y;G = Y;B = Y;offSet = rgb_width * i + j * 3;rgb_dst[offSet] = B;rgb_dst[offSet + 1] = G;rgb_dst[offSet + 2] = R;}}}
运行后的结果为：
可以看出，Y代表的就是亮度信息。
添加uv数据
改动CONVERT_YUV420PtoRGB24 的代码如下。值得注意的是，雷兄给的第一种方法，颜色有些许偏差，查资料可以看出来，第二种方法更加主流。/questions/1737726/how-to-perform-rgb-yuv-conversion-in-c-c
void CONVERT_YUV420PtoRGB24(unsigned char* yuv_src, unsigned char* rgb_dst, int nWidth, int nHeight){unsigned char Y, U, V, R, G, B;unsigned char* y_planar, * u_planar, * v_planar;int offSet = 0;int rgb_width = nWidth * 3;int ypSize = nWidth * nHeight;int upSize = (ypSize >> 2);int u_width = (nWidth >> 1);y_planar = yuv_src;u_planar = yuv_src + ypSize;v_planar = u_planar + upSize;for (int i = 0; i < nHeight; i++){for (int j = 0; j < nWidth; j++){Y = *(y_planar + nWidth * i + j);offSet = (i >> 1) * (u_width)+(j >> 1);U = *(v_planar + offSet);V = *(u_planar + offSet);int C, D, E;C = Y - 16;D = U - 128;E = V - 128;R = CONVERT_ADJUST((298 * C + 409 * E + 128) >> 8);G = CONVERT_ADJUST((298 * C - 100 * D - 208 * E + 128) >> 8);B = CONVERT_ADJUST((298 * C + 516 * D + 128) >> 8);offSet = rgb_width * i + j * 3;rgb_dst[offSet] = B; // 如果不想再调用CHANGE_ENDIAN_PIC,可以直接调换 b和r的赋值位置。rgb_dst[offSet + 1] = G;rgb_dst[offSet + 2] = R;}}}
如果觉得《雷霄骅《最简单的视音频播放示例2：GDI播放YUV RGB 》中YUV转RGB的过程》对你有帮助，请点赞、收藏，并留下你的观点哦！
