Can't find the Camera.Key to report WaypointCameraZoomParam.setFocalLength

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Kenneth Argo

• 2022年03月28日 04:56

I have a V2 mission and am setting the focal length using the following:

WaypointCameraZoomParam.Builder()
    .setFocalLength(sdkVersionOfFocusLength).build()

The code is working but I'd like to give visual feedback to the pilot and have tried the 3 keys that are said to report focal length but none appear to be correct, the key is never called.

Can anyone point me to the appropriate key that will report the information?

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  DJI Developer Support

  • 2022年03月28日 07:08

  setFocalLength should affect lens(0).getHybridZoomFocalLength's value. DJI Key is HYBRID_ZOOM_FOCAL_LENGTH.

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  Kenneth Argo

  • 2022年03月28日 16:59

  Sorry, but I already tried these three: HYBRID_ZOOM_FOCAL_LENGTH, OPTICAL_ZOOM_FOCAL_LENGTH and 
  CAMERA_TARGET_FOCAL_LENGTH.

   

  None of the keys are called when the V2 mission action sets the value.

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  DJI Developer Support

  • 2022年03月29日 02:34

  Are you using H20/H20T? We will test.

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  Kenneth Argo

  • 2022年03月29日 03:08

  M300 RTK with H20

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  DJI Developer Support

  • 2022年03月29日 10:06

  Firmware Version of Drone：03..0.0014 Firmware Version of RC： Firmware Version of H20T: MSDK version:4.16.1 The result of the test is that the focal length can be obtained normally with HYBRID_ZOOM_FOCAL_LENGTH. The test log file and test code are attached.Perhaps there is no value due to a faulty acquisition. You can refer to the code used for our tests.

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  Kenneth Argo

  • 2022年03月29日 14:42

  You confirmed this during a V2 mission flight?  All my keys are initialized the same, and all other keys are reporting correctly so I am 100% certain the key connection is correct...

  This is the listener, the log statement is never seen

  
  private val zoomLevelKeyListener = KeyListener { _, o1 ->
  
      logInfo("AircraftDataSourceImpl::zoomLevelKeyListener: $o1")
  
      if (o1 is Int) {
          zoomLevelMutableLiveData.postValue(o1)
      }
  }

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  DJI Developer Support

  • 2022年03月30日 07:24

  Yes, my previous tests were carried out on the M300. I also tested the keylistener on the M300 during the route V2 run and the result was also that the focal length was acquired properly. Can you get the value of other keys by the same form? If you have set up the listeners correctly, then it is possible that there is a problem with the fetching or output part. The application I used for my tests was MSDK SAMPLE. Here are the logs and the code used during my tests.

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  Kenneth Argo

  • 2022年03月30日 17:31

  Yes, all other key listeners are working, I registered over a dozen keys, all work with the exception of this one.

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  Kenneth Argo

  • 2022年03月30日 18:23

  I think I found te issue (had your test code been included I think it would have found it quicker).  I should be using createLenseKey (I was using create()).  This can be closed

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  DJI Developer Support

  • 2022年03月31日 02:50

  I'm glad I could help you. This is really a point that is easily overlooked. If the lens class of the drone is the lens class, then the createLenseKey interface is needed to create the key.

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