Unknown camera handling

[alexsafe]

Hi,

I think this may be a bug. If I get into a situation where the camera is not available this Exception happens:

java.lang.IllegalArgumentException: getCameraCharacteristics:857: Unable to retrieve camera characteristics for unknown device 163: No such file or directory (-2) at android.hardware.camera2.CameraManager.throwAsPublicException(CameraManager.java:1630) at android.hardware.camera2.CameraManager.getCameraCharacteristics(CameraManager.java:676) at android.hardware.camera2.CameraManager.getCameraCharacteristics(CameraManager.java:617) at com.pedro.encoder.input.video.Camera2ApiManager.getCameraCharacteristics(Camera2ApiManager.kt:265) at com.pedro.encoder.input.video.Camera2ApiManager.enableVideoStabilization(Camera2ApiManager.kt:307) at com.gpxstream2.app.pages.stream.implementations.CameraSource.start(CameraSource.kt:47)

I call it from this block

override fun start(surfaceTexture: SurfaceTexture) { this.surfaceTexture = surfaceTexture if (!isRunning()) { camera.closeCamera(false) try { camera.enableVideoStabilization() camera.enableOpticalVideoStabilization() camera.disableAutoExposure() camera.exposure = 1 surfaceTexture.setDefaultBufferSize(width, height) camera.prepareCamera(surfaceTexture, width, height, fps) camera.openLastCamera() } catch (e: CameraAccessException) { log.e("CameraAccessException: ${e.message}") e.printStackTrace() switchCamera(Cameras.BACK_CAMERA.id) } } }

To me it seems that the Exception thrown by

val cameraCharacteristics: CameraCharacteristics? get() { try { return cameraManager.getCameraCharacteristics(cameraId) } catch (e: Exception) { Log.e(TAG, "Error", e) return null } }

does not get transmitted.

For reproduction, probably setting the camera to 163 before a start() is triggered (if you don;t have an HDMI cam/port connected) should do the trick.

[pedroSG94]

Hello,

I will check it

[alexsafe]

Could be prevented with an isAvaiable() check. I did something like this:

fun isCameraAvailable(cameraId: String): Boolean {
        return try {
            val cameraManager = context.getSystemService(Context.CAMERA_SERVICE) as CameraManager
            val cameraCharacteristics = cameraManager.getCameraCharacteristics(cameraId)
            val available = cameraCharacteristics.get(CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL)
            available != null
        } catch (e: CameraAccessException) {
            log.e("Camera not CameraAccessException: ${e.message}")
            false
        } catch (e: IllegalArgumentException) {
            log.e("Camera not IllegalArgumentException: ${e.message}")
            false
        }
    }

I added it in my own implementation of VideoSource() . Maybe it can be useful in Camera2ApiManager?

[pedroSG94]

Hello,

Instead of use that method you already have this method:
https://github.com/pedroSG94/RootEncoder/blob/master/encoder/src/main/java/com/pedro/encoder/input/sources/video/Camera2Source.kt#L175

Also, I tried to reproduce the error. All methods is working as expected, returning false if fail to do and the camera callback return the camera open error properly.
For example:

  override fun start(surfaceTexture: SurfaceTexture) {
    this.surfaceTexture = surfaceTexture
    if (!isRunning()) {
        camera.closeCamera(false)
        try {
            camera.setCameraId("163")
//print false as expected when fail
            Log.e("Pedro", "VideoStabilization: ${camera.enableVideoStabilization()}")
//print false as expected when fail
            Log.e("Pedro", "OpticalVideoStabilization: ${camera.enableOpticalVideoStabilization()}")
            camera.disableAutoExposure()
            camera.exposure = 1
            surfaceTexture.setDefaultBufferSize(width, height)
            camera.prepareCamera(surfaceTexture, width, height, fps)
//return camera open error properly
            camera.setCameraCallbacks(object: CameraCallbacks{
              override fun onCameraChanged(facing: CameraHelper.Facing) {
              }

              override fun onCameraError(error: String) {
                Log.e("Pedro","CameraAccessException: $error")
              }

              override fun onCameraOpened() {
              }

              override fun onCameraDisconnected() {
              }

            })
            camera.openLastCamera()
        } catch (e: CameraAccessException) {
            Log.e("Pedro","CameraAccessException: ${e.message}")
            e.printStackTrace()
            switchCamera()
        }
    }
  }

How to fix:

            val id = "163"
            val validId = camera.camerasAvailable.find { it == id }
            if (validId != null) {
              camera.setCameraId(validId)
            } else {
              switchCamera() //use front or back or any available camera
            }