yuv420转rgba,yuv420内存排列为yyyy,u,v
 

bool yuv420ToRgb(uint8_t* yuv, int w, int h, uint8_t* rgb)
{uint8_t* pBufy = new uint8_t[w * h];uint8_t* pBufu = new uint8_t[w * h / 4];uint8_t* pBufv = new uint8_t[w * h / 4];memcpy(pBufy, yuv, w * h);memcpy(pBufu, yuv + w * h, w * h / 4);memcpy(pBufv, yuv + w * h * 5 / 4, w * h / 4);for (int y = 0; y < h; y++){for (int x = 0; x < w; x++){int r = (int)(pBufy[y * w + x] + 1.370705 * (pBufv[y * w / 4 + x / int g = (int)(pBufy[y * w + x] - 0.698001 * (pBufu[y * w / 4 + x / 2] - 128) - 0.703125 * (pBufv[y * w / 4 + x / 2] - 128));int b = (int)(pBufy[y * w + x] + 1.732446 * (pBufu[y * w / 4 + x / 2] - 128));if (r > 255)r = 255;if (r < 0)r = 0;if (g > 255)g = 255;if (g < 0)g = 0;if (b > 255)b = 255;if (b < 0)free(pBufy);free(pBufu);free(pBufv);return true;}}
}