title: Change the aspect ratio of surface view according to aspect ratio of the video in exoplayer demo application
body: <p>I have implemented ExoPlayer in my Android app using the following code.</p>
  
  <pre><code>String versionName;
          try {
              String packageName = getPackageName();
              PackageInfo info = getPackageManager().getPackageInfo(packageName, 0);
              versionName = info.versionName;
          } catch (PackageManager.NameNotFoundException e) {
              versionName = "?";
          }
  
          player = ExoPlayer.Factory.newInstance(2);
  
  
          Allocator allocator = new DefaultAllocator(BUFFER_SEGMENT_SIZE);
          DataSource dataSource = new DefaultUriDataSource(this, null, versionName);
  
          MediaPresentationDescriptionParser parser = new MediaPresentationDescriptionParser();
          UriDataSource manifestDataSource = new DefaultUriDataSource(this, versionName);
          ManifestFetcher&lt;MediaPresentationDescription&gt; manifestFetcher = new ManifestFetcher&lt;&gt;(passedWorkoutObject.workoutMediaURL, manifestDataSource, parser);
  
          ExtractorSampleSource sampleSource = new ExtractorSampleSource(
                  Uri.parse(VIDEO_URL), dataSource, allocator, BUFFER_SEGMENT_COUNT * BUFFER_SEGMENT_SIZE);
  
          MediaCodecVideoTrackRenderer videoRenderer = new MediaCodecVideoTrackRenderer(
                  this, sampleSource, MediaCodec.VIDEO_SCALING_MODE_SCALE_TO_FIT_WITH_CROPPING);
  
          MediaCodecAudioTrackRenderer audioRenderer = new MediaCodecAudioTrackRenderer(sampleSource);
          player.prepare(videoRenderer, audioRenderer);
  
          player.sendMessage(videoRenderer, MediaCodecVideoTrackRenderer.MSG_SET_SURFACE, surface);
  
          player.setPlayWhenReady(true);
          control = new PlayerControl(player);
  </code></pre>
  
  <p>The problem however is that I need to play videos of all aspect Ratios. How Do I adjust the surfaceView to fit the size of the video instead of the other way around?</p>