Concurrent cameras with lens facing same direction

[Anton Ivanov]

Hey,
Currently it seems that CameraX restricts using concurrent cameras if both have same lensFacing. Could it be loosened by removing this condition? Some devices have IR cameras on board that face the same directions as RGB cameras and this is very inconvenient as it's impossible to run CameraX on those.

Thanks.

[Scott Nien]

Hi 

To clarify first, there are two similar concepts of multi-cameras in Android camera framework.  

1) Multi-camera API which is used for accessing physical cameras (Telephotos, ultrawide, wide , others) in a logical camera. Most recent premium devices support multi-cameras. Usually there are two logical camera, one for the back lensfacing, another for front lensfacing.

2) Concurrent cameras API which is used for opening front and back cameras concurrently. 

Do you think the restriction applies to the Multi-camera API or the Concurrent cameras API?  Most devices that support concurrent cameras only support one back camera and one front camera to be opened at the same time. 

Scott

   

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[Anton Ivanov]

Hey,
I'm talking about concurrent camera API.

"Most devices that support concurrent cameras only support one back camera and one front camera to be opened at the same time."

I'm talking about specific peace of code:
```

val cameras: MutableList<Camera> = ArrayList()
if (
firstCameraConfig.cameraSelector.lensFacing ==
secondCameraConfig.cameraSelector.lensFacing
) {
if (cameraOperatingMode == CAMERA_OPERATING_MODE_CONCURRENT) {
throw UnsupportedOperationException(
"Camera is already running, call unbindAll() before binding more cameras."
)
}

```
What is the reason for having ```if (cameraOperatingMode == CAMERA_OPERATING_MODE_CONCURRENT)  ```. I guess if device supports it is must not be imposed by the CameraX.

[Ivan Lara]

X

[Scott Nien]

I got your point. 

The code path you are seeing is for supporting dual selfie camera opening in Pixel fold 9 or 10. Basically it invokes multi-camera APIs instead of concurrent camera APIs. 

Can you share what device you were using?  To my knowledge,  the multiple lens of the same lens-facing should be exposed via the Multi-Camera APIs 

[Anton Ivanov]

Unfortunately, I can not share the device as it's privately engineered.
But it has one RGB and one IR camera facing the same direction.
Should this configuration be able to work in concurrent mode?

[Scott Nien]

Ok. We can change the codes to allow same lens-facing camera to be used in concurrent camera. 

  

I filed a bug https://issuetracker.google.com/476401033 to track this feature.  

[Anton Ivanov]

Thank you