Merge pull request #1910 from pedroSG94/feature/camera2-callback-availability

add camera2 callback availability

Author: pedroSG94

encoder/src/main/java/com/pedro/encoder/input/sources/video/Camera2Source.kt

@@ -19,6 +19,7 @@ package com.pedro.encoder.input.sources.video
 import android.content.Context
 import android.graphics.SurfaceTexture
 import android.hardware.camera2.CameraCharacteristics
+import android.hardware.camera2.CameraManager
 import android.os.Build
 import android.util.Range
 import android.util.Size
@@ -269,4 +270,22 @@ class Camera2Source(context: Context): VideoSource() {
     size?.let { checkResolutionSupported(it.width, it.height) }
     camera.setRequiredResolution(size)
   }
+
+  /**
+   * Add a callback to detect the camera availability.
+   * Set null value to remove the callback
+   */
+  fun setAvailabilityCallback(callback: CameraManager.AvailabilityCallback?) {
+    camera.setAvailabilityCallback(callback)
+  }
+
+  /**
+   * Re start camera if possible, return true or false depend if can do it or not.
+   */
+  fun restart(): Boolean {
+    if (isRunning()) camera.reOpenCamera(camera.getCurrentCameraId())
+    else if (camera.isPrepared) camera.openCameraId(camera.getCurrentCameraId())
+    else return false
+    return true
+  }
 }

encoder/src/main/java/com/pedro/encoder/input/video/Camera2ApiManager.kt

@@ -77,7 +77,8 @@ class Camera2ApiManager(context: Context) : CameraDevice.StateCallback() {
     private val cameraManager = context.getSystemService(Context.CAMERA_SERVICE) as CameraManager
     private var cameraHandler: Handler? = null
     private var cameraCaptureSession: CameraCaptureSession? = null
-    private var isPrepared: Boolean = false
+    var isPrepared: Boolean = false
+        private set
     private var cameraId: String = "0"
     private var physicalCameraId: String? = null
     private var facing = Facing.BACK
@@ -114,6 +115,7 @@ class Camera2ApiManager(context: Context) : CameraDevice.StateCallback() {
     private var faceDetectionEnabled = false
     private var faceDetectionMode = 0
     private var imageReader: ImageReader? = null
+    private var availabilityCallback: CameraManager.AvailabilityCallback? = null
 
     init {
         cameraId = try { getCameraIdForFacing(Facing.BACK) } catch (_: Exception) { "0" }
@@ -239,6 +241,15 @@ class Camera2ApiManager(context: Context) : CameraDevice.StateCallback() {
         this.cameraId = cameraId
     }
 
+    fun setAvailabilityCallback(callback: CameraManager.AvailabilityCallback?) {
+        if (callback == null) {
+            availabilityCallback?.let { cameraManager.unregisterAvailabilityCallback(it) }
+        } else {
+            cameraManager.registerAvailabilityCallback(callback, null)
+            availabilityCallback = callback
+        }
+    }
+
     var cameraFacing: Facing
         get() = facing
         set(cameraFacing) {