Add use cases to createCameraProvider (#536)

+---
+"client-sdk-android": minor
+---
+
+Add use cases to CameraX createCameraProvider

 # CameraX support for LiveKit Android SDK
 [![Maven Central](https://maven-badges.herokuapp.com/maven-central/io.livekit/livekit-android-camerax/badge.svg)](https://maven-badges.herokuapp.com/maven-central/io.livekit/livekit-android-camerax)
 
-This library provides an CameraX integration for use with the Android LiveKit SDK. This provides access to more camera functionality such as custom zoom and torch control.
+This library provides an CameraX integration for use with the Android LiveKit SDK. This provides access to more camera functionality such as custom zoom, torch control and taking a picture.
 
 ## Installation
 
@@ -35,6 +35,7 @@ or `LifecycleService` from `androidx.lifecycle:lifecycle-service` to use in a se
 
 Once registered, LiveKit will default to using CameraX when creating a camera video track.
 
+
 ### Accessing the camera controls
 
 ```
@@ -51,3 +52,42 @@ fun zoom(factor: Float) {
 ```
 
 We provide a convenience `ScaleZoomHelper` class that can handle pinch-to-zoom functionality as well.
+
+### Taking a high quality picture
+
+This allows you to take a high picture without interrupting the video stream.
+
+```
+// Pass in the imageCapture use case when creating the camera provider
+val imageCapture = ImageCapture.Builder()
+    .setCaptureMode(ImageCapture.CAPTURE_MODE_MAXIMIZE_QUALITY)
+    .build()
+CameraXHelper.createCameraProvider(lifecycleOwner, arrayOf(imageCapture).let {
+    if (it.isSupported(application)) {
+        CameraCapturerUtils.registerCameraProvider(it)
+
+        // Save cameraProvider for unregistration later.
+        cameraProvider = it
+    }
+}
+
+fun takeHighQualityPicture() {
+    val outputOptions = ImageCapture.OutputFileOptions.Builder(
+        File(getApplication<Application>().filesDir, "high_quality_picture.jpg")
+    ).build()
+
+    imageCapture.takePicture(
+        outputOptions,
+        ContextCompat.getMainExecutor(getApplication()),
+        object : ImageCapture.OnImageSavedCallback {
+            override fun onImageSaved(outputFileResults: ImageCapture.OutputFileResults) {
+                Log.d(TAG, "Image saved successfully: ${outputFileResults.savedUri}")
+            }
+
+            override fun onError(exception: ImageCaptureException) {
+                Log.e(TAG, "Error capturing image", exception)
+            }
+        }
+    )
+}
+```

@@ -21,6 +21,7 @@ import android.hardware.camera2.CameraManager
 import androidx.annotation.OptIn
 import androidx.camera.camera2.interop.ExperimentalCamera2Interop
 import androidx.camera.core.Camera
+import androidx.camera.core.UseCase
 import androidx.lifecycle.LifecycleOwner
 import io.livekit.android.room.track.video.CameraCapturerWithSize
 import io.livekit.android.room.track.video.CameraEventsDispatchHandler
@@ -35,6 +36,7 @@ internal class CameraXCapturer(
     private val lifecycleOwner: LifecycleOwner,
     cameraName: String?,
     eventsHandler: CameraVideoCapturer.CameraEventsHandler?,
+    private val useCases: Array<out UseCase> = emptyArray(),
 ) : CameraCapturer(cameraName, eventsHandler, CameraXEnumerator(context, lifecycleOwner)) {
 
     @FlowObservable
@@ -90,6 +92,7 @@ internal class CameraXCapturer(
             width,
             height,
             framerate,
+            useCases,
         )
     }
 }

@@ -24,6 +24,7 @@ import android.os.Build
 import android.os.Build.VERSION
 import androidx.camera.camera2.interop.Camera2CameraInfo
 import androidx.camera.camera2.interop.ExperimentalCamera2Interop
+import androidx.camera.core.UseCase
 import androidx.lifecycle.LifecycleOwner
 
 /**
@@ -33,13 +34,14 @@ import androidx.lifecycle.LifecycleOwner
 class CameraXEnumerator(
     context: Context,
     private val lifecycleOwner: LifecycleOwner,
+    private val useCases: Array<out UseCase> = emptyArray(),
 ) : Camera2Enumerator(context) {
 
     override fun createCapturer(
         deviceName: String?,
         eventsHandler: CameraVideoCapturer.CameraEventsHandler?,
     ): CameraVideoCapturer {
-        return CameraXCapturer(context, lifecycleOwner, deviceName, eventsHandler)
+        return CameraXCapturer(context, lifecycleOwner, deviceName, eventsHandler, useCases)
     }
 
     companion object {

@@ -19,6 +19,7 @@ package livekit.org.webrtc
 import android.content.Context
 import android.hardware.camera2.CameraManager
 import androidx.camera.camera2.interop.ExperimentalCamera2Interop
+import androidx.camera.core.UseCase
 import androidx.lifecycle.Lifecycle
 import androidx.lifecycle.LifecycleOwner
 import io.livekit.android.room.track.LocalVideoTrackOptions
@@ -35,10 +36,14 @@ class CameraXHelper {
          * For use with [CameraCapturerUtils.registerCameraProvider].
          * Remember to unregister the provider when outside the lifecycle
          * of [lifecycleOwner].
+         *
+         * @param lifecycleOwner The lifecycleOwner which controls the lifecycle transitions of the use cases.
+         * @param useCases The use cases to bind to a lifecycle.
          */
         @ExperimentalCamera2Interop
         fun createCameraProvider(
             lifecycleOwner: LifecycleOwner,
+            useCases: Array<out UseCase> = emptyArray(),
         ) = object : CameraCapturerUtils.CameraProvider {
 
             private var enumerator: CameraXEnumerator? = null
@@ -46,7 +51,7 @@ class CameraXHelper {
             override val cameraVersion = 3
 
             override fun provideEnumerator(context: Context): CameraXEnumerator =
-                enumerator ?: CameraXEnumerator(context, lifecycleOwner).also {
+                enumerator ?: CameraXEnumerator(context, lifecycleOwner, useCases).also {
                     enumerator = it
                 }
 

@@ -35,6 +35,7 @@ import androidx.camera.core.CameraSelector
 import androidx.camera.core.ImageAnalysis
 import androidx.camera.core.Preview
 import androidx.camera.core.Preview.SurfaceProvider
+import androidx.camera.core.UseCase
 import androidx.camera.lifecycle.ProcessCameraProvider
 import androidx.core.content.ContextCompat
 import androidx.lifecycle.LifecycleOwner
@@ -57,6 +58,7 @@ internal constructor(
     private val width: Int,
     private val height: Int,
     private val frameRate: Int,
+    private val useCases: Array<out UseCase> = emptyArray(),
 ) : CameraSession {
 
     private var state = SessionState.RUNNING
@@ -171,7 +173,13 @@ internal constructor(
                         cameraProvider.unbindAll()
 
                         // Bind use cases to camera
-                        camera = cameraProvider.bindToLifecycle(lifecycleOwner, cameraSelector, imageAnalysis, preview)
+                        camera = cameraProvider.bindToLifecycle(
+                            lifecycleOwner,
+                            cameraSelector,
+                            imageAnalysis,
+                            preview,
+                            *useCases,
+                        )
 
                         cameraThreadHandler.post {
                             sessionCallback.onDone(this@CameraXSession)