VideoCapturerAndroid: Add test for making calls on stopped camera

talk/app/webrtc/androidtests/src/org/webrtc/VideoCapturerAndroidTest.java

 /*
  * libjingle
  * Copyright 2015 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
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     // Ensure that frames are received.
     RendererCallbacks callbacks = new RendererCallbacks();
     track.addRenderer(new VideoRenderer(callbacks));
     assertTrue(callbacks.WaitForNextFrameToRender() > 0);
     track.dispose();
     source.dispose();
     factory.dispose();
     assertTrue(capturer.isReleased());
   }
 
+  @MediumTest
+  // Test what happens when attempting to call e.g. switchCamera() after camera has been stopped.
+  public void testCameraCallsAfterStop() throws InterruptedException {
+    final String deviceName = CameraEnumerationAndroid.getDeviceName(0);
+    final VideoCapturerAndroid capturer = VideoCapturerAndroid.create(deviceName, null);
+    final List<CaptureFormat> formats = CameraEnumerationAndroid.getSupportedFormats(0);
+    final CameraEnumerationAndroid.CaptureFormat format = formats.get(0);
+
+    final FakeCapturerObserver observer = new FakeCapturerObserver();
+    capturer.startCapture(format.width, format.height, format.maxFramerate,
+        getInstrumentation().getContext(), observer);
+    // Make sure camera is started and then stop it.
+    assertTrue(observer.WaitForCapturerToStart());
+    capturer.stopCapture();
+    for (long timeStamp : observer.getCopyAndResetListOftimeStamps()) {
+      capturer.returnBuffer(timeStamp);
+    }
+    // We can't change |capturer| at this point, but we should not crash.
+    capturer.switchCamera(null);
+    capturer.onOutputFormatRequest(640, 480, 15);
+    capturer.changeCaptureFormat(640, 480, 15);
+
+    capturer.dispose();
+    assertTrue(capturer.isReleased());
+  }
+
   @SmallTest
   // This test that the VideoSource that the VideoCapturer is connected to can
   // be stopped and restarted. It tests both the Java and the C++ layer.
   public void testStopRestartVideoSource() throws Exception {
     PeerConnectionFactory factory = new PeerConnectionFactory();
     VideoCapturerAndroid capturer = VideoCapturerAndroid.create("", null);
     VideoSource source =
         factory.createVideoSource(capturer, new MediaConstraints());
     VideoTrack track = factory.createVideoTrack("dummy", source);
     RendererCallbacks callbacks = new RendererCallbacks();
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         }
       }
     });
     returnThread.start();
     returnThread.join();
 
     // Check that frames have successfully returned. This will cause |capturer| to be released.
     assertTrue(capturer.isReleased());
   }
 }