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androidx.camera

Code: Select all

@OptIn(ExperimentalGetImage::class)
private fun startCamera(deviceSize: Pair) {
val cameraProviderFuture = ProcessCameraProvider.getInstance(this)

cameraProviderFuture.addListener({
val cameraProvider = cameraProviderFuture.get()
val preview = Preview.Builder().build().also {
it.surfaceProvider = PreviewView(this).surfaceProvider
}

val size = Size(deviceSize.first, deviceSize.second)

val strategy = ResolutionStrategy(deviceSize, 2)

val rs = ResolutionSelector.Builder().setResolutionStrategy(strategy)

val imageAnalysis = ImageAnalysis.Builder()
.setBackpressureStrategy(ImageAnalysis.STRATEGY_KEEP_ONLY_LATEST)
.setResolutionSelector(rs.build())
.build()

imageAnalysis.setAnalyzer(cameraExecutor) { imageProxy ->
val rotationDegrees = imageProxy.imageInfo.rotationDegrees
val mediaImage = imageProxy.image

if (mediaImage != null) {
val inputImage = InputImage.fromMediaImage(mediaImage, rotationDegrees)

detectFaces(inputImage) { faces ->
drawRectangles(faces)
imageProxy.close()
}
} else {
imageProxy.close()
}
}

val cameraSelector = CameraSelector.DEFAULT_FRONT_CAMERA

try {
cameraProvider.unbindAll()
cameraProvider.bindToLifecycle(this, cameraSelector, preview, imageAnalysis)
} catch (e: Exception) {
e.printStackTrace()
}
}, ContextCompat.getMainExecutor(this))
}