Restore frame processor after videos (#344)

cameraview/src/androidTest/java/com/otaliastudios/cameraview/IntegrationTest.java

@@ -626,5 +626,19 @@ public class IntegrationTest extends BaseTest {
         assert30Frames(processor);
     }
 
+
+    @Test
+    public void testFrameProcessing_afterVideo() throws Exception {
+        FrameProcessor processor = mock(FrameProcessor.class);
+        camera.addFrameProcessor(processor);
+        camera.setSessionType(SessionType.VIDEO);
+        waitForOpen(true);
+
+        camera.startCapturingVideo(null, 2000);
+        waitForVideoEnd(true);
+
+        assert30Frames(processor);
+    }
+
     //endregion
 }

cameraview/src/main/java/com/otaliastudios/cameraview/Camera1.java

@@ -684,6 +684,10 @@ class Camera1 extends CameraController implements Camera.PreviewCallback, Camera
             mCameraCallbacks.dispatchOnVideoTaken(mVideoFile);
             mVideoFile = null;
         }
+        if (mCamera != null) {
+            // This is needed to restore FrameProcessor. No re-allocation needed though.
+            mCamera.setPreviewCallbackWithBuffer(this);
+        }
     }
 
     @WorkerThread