OSDK中如何切换H20相机的视频源

关键词：OSDK相机H20/T，相机模式/镜头源，变焦模式切换

其实OSDK里面是有这样的方法的，但是API文档里面没有，具体方法如下 changeH264Source。

/*! @brief
* Change the camera stream source from one payload device. (Beta API)
*
* @platforms M300
* @note Only support for payload device : H20/H20T
* @param pos point out which camera to output the H264 stream
* @param source change to be the target camera of the payload, ref to
* LiveView::LiveViewCameraSource
* @return Errorcode of liveivew, ref to DJI::OSDK::LiveView::LiveViewErrCode
*/
LiveViewErrCode changeH264Source(LiveViewCameraPosition pos, LiveViewCameraSource source);