CameraX auto adjustments control

[202ngnr]

Hello.

I am developing an application for recognizing moving objects, and the problem is that when an object appears, the camera adjusts to it, changing the background at the same time. There is focusing on the object, and the overall brightness of the image changes if the brightness of the object is different from the brightness of the background. I need to disable all automatic settings. I'm trying different methods, for clarity I've combined them into a function. The variant with FocusMeteringAction disables autofocus, but the brightness change remains, with the reference point moving to the upper right corner (according to mp1 coordinates). The option with Camera2CameraControl (option 2) also disables autofocus, but leaves automatic brightness change (automatic white balance?). Moreover, option 3 does not turn on the autofocus back. The Camera2Interop option does not work at all, probably because this ImageAnalysis object is not connected to the cameraProvider. Attempting to connect Camera2Interop to CameraX sample code fails, errors occur.

```

private fun camAutoCtrls(mode: Int = 1) {
if (mode == 0) {
val mp1 = SurfaceOrientedMeteringPointFactory(1.0F, 1.0F).createPoint(0.0F, 0.0F)
val mp2 = SurfaceOrientedMeteringPointFactory(1.0F, 1.0F).createPoint(0.5F, 0.1F)
val fma = FocusMeteringAction.Builder(mp1) // must be AF | AE | AWB
.addPoint(mp2, FocusMeteringAction.FLAG_AWB) // single flag allowed ??
//.setAutoCancelDuration(10, TimeUnit.MINUTES)
.disableAutoCancel()
.build()
camCtl.startFocusAndMetering(fma) //camCtl: CameraControl
return
}
if (mode == 1) {
camCtl.cancelFocusAndMetering()
return
}
if (mode == 2) {
val c2cc = Camera2CameraControl.from(camCtl) // error: This declaration is opt-in and its usage should be marked with
c2cc.captureRequestOptions = CaptureRequestOptions.Builder()
.setCaptureRequestOption(CaptureRequest.CONTROL_AWB_MODE,CaptureRequest.CONTROL_AWB_MODE_OFF)
.setCaptureRequestOption(CaptureRequest.CONTROL_AF_MODE,CaptureRequest.CONTROL_AF_MODE_OFF)
.setCaptureRequestOption(CaptureRequest.CONTROL_AE_MODE,CaptureRequest.CONTROL_AE_MODE_OFF)
.build()
return
}
if (mode == 3) {
val c2cc = Camera2CameraControl.from(camCtl) // error: This declaration is opt-in and its usage should be marked with
c2cc.captureRequestOptions = CaptureRequestOptions.Builder()
.setCaptureRequestOption(CaptureRequest.CONTROL_AWB_MODE,CaptureRequest.CONTROL_AWB_MODE_AUTO)
.setCaptureRequestOption(CaptureRequest.CONTROL_AF_MODE,CaptureRequest.CONTROL_AF_MODE_AUTO)
.setCaptureRequestOption(CaptureRequest.CONTROL_AE_MODE,CaptureRequest.CONTROL_AE_MODE_ON)
.build()
return
}
if (mode == 4) {
val builder = ImageAnalysis.Builder()
val c2io = Camera2Interop.Extender(builder) //do not work
c2io.setCaptureRequestOption(CaptureRequest.CONTROL_AWB_MODE,CaptureRequest.CONTROL_AWB_MODE_OFF)
c2io.setCaptureRequestOption(CaptureRequest.CONTROL_AF_MODE,CaptureRequest.CONTROL_AF_MODE_OFF)
//c2io.setCaptureRequestOption(CaptureRequest.CONTROL_AE_LOCK,true)
return
}
}

```

Maybe I'm wrong, and the brightness change is not related to the automatic white balance, but then what? With exposure? But the exposureCompensationIndex does not change.

```

//camInf: CameraInfo

val x1 = camInf.exposureState.exposureCompensationIndex  // 0 always
val x2 = camInf.exposureState.exposureCompensationRange.lower  // -12 always
val x3 = camInf.exposureState.exposureCompensationRange.upper // 12 always
```

So, can you suggest a good way to disable the automatic camera settings, and in such a way that they can be turned back on? I found a post with a similar request dated 2019, but there were only promises to implement.

Also, options 2 and 3 give an error "This declaration is opt-in and its usage should be marked with", but the code compiles and works. Is there any way around this error other than suppress?

Tried on two phones with Android 5, the same on both.

I apologize if I did not see the solution in the discussion.

[202ngnr]

That's ... sad.  Ok, the solution is

```
    fun cam2setAutoAdj(enable: Boolean) {
        @androidx.camera.camera2.interop.ExperimentalCamera2Interop
        val c2cc = Camera2CameraControl.from(camCtl)
        if (!enable) {
            @androidx.camera.camera2.interop.ExperimentalCamera2Interop
            c2cc.captureRequestOptions = CaptureRequestOptions.Builder()
                .setCaptureRequestOption(CaptureRequest.CONTROL_AWB_MODE, CaptureRequest.CONTROL_AWB_MODE_OFF)
                .setCaptureRequestOption(CaptureRequest.CONTROL_AWB_LOCK,true)
                .setCaptureRequestOption(CaptureRequest.CONTROL_AE_MODE, CaptureRequest.CONTROL_AE_MODE_OFF)
                .setCaptureRequestOption(CaptureRequest.CONTROL_AE_LOCK,true)
                .setCaptureRequestOption(CaptureRequest.CONTROL_AF_MODE, CaptureRequest.CONTROL_AF_MODE_OFF)
                .build()
        } else
            c2cc.clearCaptureRequestOptions()
    }
```