Re: [camerax-developers] Is it possible to get imageCapture Target Resolution to equal or less than previewView size?

[Charcoal Chen]

Hi,

By using existing public API, apps can't specify a setting to select equal to or lower resolution against a specific size. But we're working on a new ResolutionSelector API to provide such a kind of ability. The new ResolutionSelector API is targeted to be public in the 1.3.0-alpha stage.

A short-term solution, you might be able to retrieve the supported JPEG output sizes via Camera2Interop. The code might be similar to:

val cameraInfo = ... // retrieves the CameraInfo of the target camera

val camera2CameraInfo = Camera2CameraInfo.from(cameraInfo)

val streamConfigurationMap = camera2CameraInfo.getCameraCharacteristics(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP)

val jpegOutputSizes = streamConfigurationMap.getOutputSizes(ImageFormat.JPEG)

// Try to find your preferred size from jpegOutputSizes and then specify it as the ImageCapture's target resolution (Please remember to flip the size according to your target rotation setting)

// Then, bind the ImageCapture use case to lifecycle

BTW, you should be able to unbind the bound ImageCapture use case by ProcessCameraProvider#unbind(UseCase[]). Could you describe more details about the problem you encountered when rebinding the ImageCapture use case?

 

On Mon, Mar 13, 2023 at 6:26 PM Khun Chansopheak <khun.cha...@gmail.com> wrote:

I can list down camera supported resolution after I bind imageCapture to Lifecycle. CameraX will set resolution the higher or max if it doesn't match supported size on the list.

I want to get the right size resolution that have width less than previewView for the output image. To do that I have to loop to find the size (resolution) and setTargetResolution to imageCapture. But after bind imageCapture to Lifecycle, I can't rebind it again because camera in on preview.

I don't want to do rotation and want camera in vertical view only.

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