视频流读取:

	FILE *fs = NULL;
	int iRet  = fopen_s(&fs,"test_yuv420p_320x180.yuv", "rb");
	if (0 != iRet)
	{
		return;
	}
	char buf[320 * 90 * 3] = { 0 };
	int iLen = fread(buf, 1, 320 * 90 * 3, fs);