add lockExposure to Camera2Source

Based on:
pedroSG94#1863

Author: bratta-dk

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

@@ -269,4 +269,8 @@ class Camera2Source(context: Context): VideoSource() {
     size?.let { checkResolutionSupported(it.width, it.height) }
     camera.setRequiredResolution(size)
   }
+
+  fun lockExposure(enabled: Boolean) = camera.lockExposure(enabled)
+
+  fun isLockExposureEnabled() = camera.isLockExposureEnabled()
 }

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

@@ -96,6 +96,8 @@ class Camera2ApiManager(context: Context) : CameraDevice.StateCallback() {
         private set
     var isAutoWhiteBalanceEnabled: Boolean = true
         private set
+    var lockExposureEnabled: Boolean = false
+        private set
     var isRunning: Boolean = false
         private set
     private var fps = 30
@@ -313,6 +315,17 @@ class Camera2ApiManager(context: Context) : CameraDevice.StateCallback() {
         }
     }
 
+    fun lockExposure(enabled: Boolean): Boolean {
+        val builderInputSurface = this.builderInputSurface ?: return false
+        builderInputSurface.set(CaptureRequest.CONTROL_AE_LOCK, enabled)
+        if (applyRequest(builderInputSurface)) {
+            lockExposureEnabled = enabled
+            return true
+        } else return false
+    }
+
+    fun isLockExposureEnabled() = lockExposureEnabled
+
     /**
      * @param mode value from CameraCharacteristics.CONTROL_AWB_MODE_*
      */

library/src/main/java/com/pedro/library/base/Camera2Base.java

@@ -966,6 +966,26 @@ public boolean tapToFocus(View view, MotionEvent event) {
         return cameraManager.tapToFocus(view, event);
     }
 
+
+    /**
+     * Lock or unlock exposure
+     *
+     * @param enabled true to lock exposure, false to unlock
+     * @return true if successful, false otherwise
+     */
+    public boolean lockExposure(boolean enabled) {
+        return cameraManager.lockExposure(enabled);
+    }
+
+    /**
+     * Check if exposure is locked
+     *
+     * @return true if exposure is locked, false otherwise
+     */
+    public boolean isLockExposureEnabled() {
+        return cameraManager.isLockExposureEnabled();
+    }
+
     public GlInterface getGlInterface() {
         return glInterface;
     }