override fun start()

in amazon-chime-sdk/src/main/java/com/amazonaws/services/chime/sdk/meetings/audiovideo/video/capture/DefaultCameraCaptureSource.kt [185:233]
45 lines of code
2 McCabe index (conditional complexity)

    override fun start() {
        if (ActivityCompat.checkSelfPermission(
                context,
                Manifest.permission.CAMERA
            ) != PackageManager.PERMISSION_GRANTED
        ) {
            handleCameraCaptureFail(CaptureSourceError.PermissionError)
            throw SecurityException("Missing necessary camera permissions")
        }
        stop()
        logger.info(TAG, "Camera capture start requested with device: $device")
        val device = device ?: run {
            logger.info(TAG, "Cannot start camera capture with null device")
            return
        }
        val id = device.id ?: run {
            logger.info(TAG, "Cannot start camera capture with null device id")
            return
        }

        cameraCharacteristics = cameraManager.getCameraCharacteristics(id).also {
            // Store these immediately for convenience
            sensorOrientation = it.get(CameraCharacteristics.SENSOR_ORIENTATION) ?: 0
            isCameraFrontFacing =
                it.get(CameraCharacteristics.LENS_FACING) == CameraMetadata.LENS_FACING_FRONT
        }
        val maxWidth: Int = this.maxResolution.width
        val maxHeight: Int = this.maxResolution.height
        val maxFps: Int = 30

        val chosenCaptureFormat: VideoCaptureFormat? =
            MediaDevice.listSupportedVideoCaptureFormats(cameraManager, device, maxFps, maxWidth, maxHeight).minByOrNull { format ->
                abs(format.width - this.format.width) + abs(format.height - this.format.height)
            }
        val surfaceTextureFormat: VideoCaptureFormat = chosenCaptureFormat ?: run {
            handleCameraCaptureFail(CaptureSourceError.ConfigurationFailure)
            return
        }
        surfaceTextureSource =
            surfaceTextureCaptureSourceFactory.createSurfaceTextureCaptureSource(
                surfaceTextureFormat.width,
                surfaceTextureFormat.height,
                contentHint
            )
        surfaceTextureSource?.addVideoSink(this)
        surfaceTextureSource?.start()

        cameraManager.openCamera(id, cameraDeviceStateCallback, handler)
    }