tests/tests/media/src/android/media/cts/DecodeAccuracyTest.java - platform/cts - Git at Google

 /*
  * Copyright (C) 2016 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
 package android.media.cts;

 import static junit.framework.TestCase.assertTrue;

 import static org.junit.Assert.fail;

 import android.media.cts.R;

 import android.annotation.TargetApi;
 import android.content.Context;
 import android.graphics.Bitmap;
 import android.media.MediaFormat;
 import android.util.Log;
 import android.view.View;

 import com.android.compatibility.common.util.MediaUtils;

 import java.lang.reflect.Field;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;

 import org.junit.After;
 import org.junit.Before;
 import org.junit.Rule;
 import org.junit.rules.Timeout;
 import org.junit.runner.RunWith;
 import org.junit.runners.Parameterized;
 import org.junit.runners.Parameterized.Parameters;
 import org.junit.Test;

 @TargetApi(24)
 @RunWith(Parameterized.class)
 public class DecodeAccuracyTest extends DecodeAccuracyTestBase {

     private static final String TAG = DecodeAccuracyTest.class.getSimpleName();
     private static final Field[] fields = R.raw.class.getFields();
     private static final int ALLOWED_GREATEST_PIXEL_DIFFERENCE = 90;
     private static final int OFFSET = 10;
     private static final long PER_TEST_TIMEOUT_MS = 60000;
     private static final String[] VIDEO_FILES = {
         // 144p
         "video_decode_accuracy_and_capability-h264_256x108_30fps.mp4",
         "video_decode_accuracy_and_capability-h264_256x144_30fps.mp4",
         "video_decode_accuracy_and_capability-h264_192x144_30fps.mp4",
         "video_decode_accuracy_and_capability-h264_82x144_30fps.mp4",
         "video_decode_accuracy_and_capability-vp9_256x108_30fps.webm",
         "video_decode_accuracy_and_capability-vp9_256x144_30fps.webm",
         "video_decode_accuracy_and_capability-vp9_192x144_30fps.webm",
         "video_decode_accuracy_and_capability-vp9_82x144_30fps.webm",
         // 240p
         "video_decode_accuracy_and_capability-h264_426x182_30fps.mp4",
         "video_decode_accuracy_and_capability-h264_426x240_30fps.mp4",
         "video_decode_accuracy_and_capability-h264_320x240_30fps.mp4",
         "video_decode_accuracy_and_capability-h264_136x240_30fps.mp4",
         "video_decode_accuracy_and_capability-vp9_426x182_30fps.webm",
         "video_decode_accuracy_and_capability-vp9_426x240_30fps.webm",
         "video_decode_accuracy_and_capability-vp9_320x240_30fps.webm",
         "video_decode_accuracy_and_capability-vp9_136x240_30fps.webm",
         // 360p
         "video_decode_accuracy_and_capability-h264_640x272_30fps.mp4",
         "video_decode_accuracy_and_capability-h264_640x360_30fps.mp4",
         "video_decode_accuracy_and_capability-h264_480x360_30fps.mp4",
         "video_decode_accuracy_and_capability-h264_202x360_30fps.mp4",
         "video_decode_accuracy_and_capability-vp9_640x272_30fps.webm",
         "video_decode_accuracy_and_capability-vp9_640x360_30fps.webm",
         "video_decode_accuracy_and_capability-vp9_480x360_30fps.webm",
         "video_decode_accuracy_and_capability-vp9_202x360_30fps.webm",
         // 480p
         "video_decode_accuracy_and_capability-h264_854x362_30fps.mp4",
         "video_decode_accuracy_and_capability-h264_854x480_30fps.mp4",
         "video_decode_accuracy_and_capability-h264_640x480_30fps.mp4",
         "video_decode_accuracy_and_capability-h264_270x480_30fps.mp4",
         "video_decode_accuracy_and_capability-vp9_854x362_30fps.webm",
         "video_decode_accuracy_and_capability-vp9_854x480_30fps.webm",
         "video_decode_accuracy_and_capability-vp9_640x480_30fps.webm",
         "video_decode_accuracy_and_capability-vp9_270x480_30fps.webm",
         // 720p
         "video_decode_accuracy_and_capability-h264_1280x544_30fps.mp4",
         "video_decode_accuracy_and_capability-h264_1280x720_30fps.mp4",
         "video_decode_accuracy_and_capability-h264_960x720_30fps.mp4",
         "video_decode_accuracy_and_capability-h264_406x720_30fps.mp4",
         "video_decode_accuracy_and_capability-vp9_1280x544_30fps.webm",
         "video_decode_accuracy_and_capability-vp9_1280x720_30fps.webm",
         "video_decode_accuracy_and_capability-vp9_960x720_30fps.webm",
         "video_decode_accuracy_and_capability-vp9_406x720_30fps.webm",
         // 1080p
         "video_decode_accuracy_and_capability-h264_1920x818_30fps.mp4",
         "video_decode_accuracy_and_capability-h264_1920x1080_30fps.mp4",
         "video_decode_accuracy_and_capability-h264_1440x1080_30fps.mp4",
         "video_decode_accuracy_and_capability-h264_608x1080_30fps.mp4",
         "video_decode_accuracy_and_capability-vp9_1920x818_30fps.webm",
         "video_decode_accuracy_and_capability-vp9_1920x1080_30fps.webm",
         "video_decode_accuracy_and_capability-vp9_1440x1080_30fps.webm",
         "video_decode_accuracy_and_capability-vp9_608x1080_30fps.webm",
         // 1440p
         "video_decode_accuracy_and_capability-h264_2560x1090_30fps.mp4",
         "video_decode_accuracy_and_capability-h264_2560x1440_30fps.mp4",
         "video_decode_accuracy_and_capability-h264_1920x1440_30fps.mp4",
         "video_decode_accuracy_and_capability-h264_810x1440_30fps.mp4",
         "video_decode_accuracy_and_capability-vp9_2560x1090_30fps.webm",
         "video_decode_accuracy_and_capability-vp9_2560x1440_30fps.webm",
         "video_decode_accuracy_and_capability-vp9_1920x1440_30fps.webm",
         "video_decode_accuracy_and_capability-vp9_810x1440_30fps.webm",
         // 2160p
         "video_decode_accuracy_and_capability-h264_3840x1634_30fps.mp4",
         "video_decode_accuracy_and_capability-h264_3840x2160_30fps.mp4",
         "video_decode_accuracy_and_capability-h264_2880x2160_30fps.mp4",
         "video_decode_accuracy_and_capability-h264_1216x2160_30fps.mp4",
         "video_decode_accuracy_and_capability-vp9_3840x1634_30fps.webm",
         "video_decode_accuracy_and_capability-vp9_3840x2160_30fps.webm",
         "video_decode_accuracy_and_capability-vp9_2880x2160_30fps.webm",
         "video_decode_accuracy_and_capability-vp9_1216x2160_30fps.webm",
         // cropped
         "video_decode_with_cropping-h264_520x360_30fps.mp4",
         "video_decode_with_cropping-vp9_520x360_30fps.webm"
     };

     private View videoView;
     private VideoViewFactory videoViewFactory;
     private String fileName;
     private SimplePlayer player;

     @After
     @Override
     public void tearDown() throws Exception {
         if (player != null) {
             player.release();
         }
         if (videoView != null) {
             getHelper().cleanUpView(videoView);
         }
         if (videoViewFactory != null) {
             videoViewFactory.release();
         }
         super.tearDown();
     }

     @Parameters
     public static Collection<Object[]> data() {
         final List<Object[]> testParams = new ArrayList<>();
         for (int i = 0; i < VIDEO_FILES.length; i++) {
             final String file = VIDEO_FILES[i];
             Pattern regex = Pattern.compile("^\\w+-(\\w+)_\\d+fps.\\w+");
             Matcher matcher = regex.matcher(file);
             String testName = "";
             if (matcher.matches()) {
                 testName = matcher.group(1);
             }
             testParams.add(new Object[] { testName.replace("_", " ").toUpperCase(), file });
         }
         return testParams;
     }

     public DecodeAccuracyTest(String testname, String fileName) {
         this.fileName = fileName;
     }

     @Test(timeout = PER_TEST_TIMEOUT_MS)
     public void testGLViewDecodeAccuracy() throws Exception {
         runTest(new GLSurfaceViewFactory(), new VideoFormat(fileName));
     }

     @Test(timeout = PER_TEST_TIMEOUT_MS)
     public void testGLViewLargerHeightDecodeAccuracy() throws Exception {
         runTest(new GLSurfaceViewFactory(), getLargerHeightVideoFormat(new VideoFormat(fileName)));
     }

     @Test(timeout = PER_TEST_TIMEOUT_MS)
     public void testGLViewLargerWidthDecodeAccuracy() throws Exception {
         runTest(new GLSurfaceViewFactory(), getLargerWidthVideoFormat(new VideoFormat(fileName)));
     }

     @Test(timeout = PER_TEST_TIMEOUT_MS)
     public void testSurfaceViewVideoDecodeAccuracy() throws Exception {
         runTest(new SurfaceViewFactory(), new VideoFormat(fileName));
     }

     @Test(timeout = PER_TEST_TIMEOUT_MS)
     public void testSurfaceViewLargerHeightDecodeAccuracy() throws Exception {
         runTest(new SurfaceViewFactory(), getLargerHeightVideoFormat(new VideoFormat(fileName)));
     }

     @Test(timeout = PER_TEST_TIMEOUT_MS)
     public void testSurfaceViewLargerWidthDecodeAccuracy() throws Exception {
         runTest(new SurfaceViewFactory(), getLargerWidthVideoFormat(new VideoFormat(fileName)));
     }

     private void runTest(VideoViewFactory videoViewFactory, VideoFormat vf) {
         Log.i(TAG, "Running test for " + vf.toPrettyString());
         if (!MediaUtils.canDecodeVideo(vf.getMimeType(), vf.getWidth(), vf.getHeight(), 30)) {
             MediaUtils.skipTest(TAG, "No supported codec is found.");
             return;
         }
         this.videoViewFactory = checkNotNull(videoViewFactory);
         this.videoView = videoViewFactory.createView(getHelper().getContext());
         final int maxRetries = 3;
         for (int retry = 1; retry <= maxRetries; retry++) {
             // If view is intended and available to display.
             if (videoView != null) {
                 getHelper().generateView(videoView);
             }
             try {
                 videoViewFactory.waitForViewIsAvailable();
                 break;
             } catch (Exception exception) {
                 Log.e(TAG, exception.getMessage());
                 if (retry == maxRetries) {
                     fail("Timeout waiting for a valid surface.");
                 } else {
                     Log.w(TAG, "Try again...");
                     bringActivityToFront();
                 }
             }
         }
         final int golden = getGoldenId(vf.getDescription(), vf.getOriginalSize());
         assertTrue("No golden found.", golden != 0);
         decodeVideo(vf, videoViewFactory);
         validateResult(vf, videoViewFactory.getVideoViewSnapshot(), golden);
     }

     private void decodeVideo(VideoFormat videoFormat, VideoViewFactory videoViewFactory) {
         this.player = new SimplePlayer(getHelper().getContext());
         final SimplePlayer.PlayerResult playerResult = player.decodeVideoFrames(
                 videoViewFactory.getSurface(), videoFormat, 10);
         assertTrue(playerResult.getFailureMessage(), playerResult.isSuccess());
     }

     private void validateResult(
             VideoFormat videoFormat, VideoViewSnapshot videoViewSnapshot, int goldenId) {
         final Bitmap result = checkNotNull("The expected bitmap from snapshot is null",
                 getHelper().generateBitmapFromVideoViewSnapshot(videoViewSnapshot));
         final Bitmap golden = getHelper().generateBitmapFromImageResourceId(goldenId);
         final BitmapCompare.Difference difference = BitmapCompare.computeMinimumDifference(
                 result, golden, videoFormat.getOriginalWidth(), videoFormat.getOriginalHeight());
         assertTrue("With the best matched border crop ("
                 + difference.bestMatchBorderCrop.first + ", "
                 + difference.bestMatchBorderCrop.second + "), "
                 + "greatest pixel difference is "
                 + difference.greatestPixelDifference
                 + (difference.greatestPixelDifferenceCoordinates != null
                         ? " at (" + difference.greatestPixelDifferenceCoordinates.first + ", "
                             + difference.greatestPixelDifferenceCoordinates.second + ")" : "")
                 + " which is over the allowed difference " + ALLOWED_GREATEST_PIXEL_DIFFERENCE,
                 difference.greatestPixelDifference <= ALLOWED_GREATEST_PIXEL_DIFFERENCE);
     }

     private static VideoFormat getLargerHeightVideoFormat(VideoFormat videoFormat) {
         return new VideoFormat(videoFormat) {
             @Override
             public int getHeight() {
                 return super.getHeight() + OFFSET;
             }

             @Override
             public boolean isAbrEnabled() {
                 return true;
             }
         };
     }

     private static VideoFormat getLargerWidthVideoFormat(VideoFormat videoFormat) {
         return new VideoFormat(videoFormat) {
             @Override
             public int getWidth() {
                 return super.getWidth() + OFFSET;
             }

             @Override
             public boolean isAbrEnabled() {
                 return true;
             }
         };
     }

     /**
      * Returns the resource id by matching parts of the video and golden file name.
      */
     private static int getGoldenId(String description, String size) {
         for (Field field : fields) {
             try {
                 final String name = field.getName();
                 if (name.contains("golden") && name.contains(description) && name.contains(size)) {
                     int id = field.getInt(null);
                     return field.getInt(null);
                 }
             } catch (IllegalAccessException | NullPointerException e) {
                 // No file found.
             }
         }
         return 0;
     }

 }
	/*
	* Copyright (C) 2016 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/
	package android.media.cts;

	import static junit.framework.TestCase.assertTrue;

	import static org.junit.Assert.fail;

	import android.media.cts.R;

	import android.annotation.TargetApi;
	import android.content.Context;
	import android.graphics.Bitmap;
	import android.media.MediaFormat;
	import android.util.Log;
	import android.view.View;

	import com.android.compatibility.common.util.MediaUtils;

	import java.lang.reflect.Field;
	import java.util.ArrayList;
	import java.util.Collection;
	import java.util.List;
	import java.util.regex.Matcher;
	import java.util.regex.Pattern;

	import org.junit.After;
	import org.junit.Before;
	import org.junit.Rule;
	import org.junit.rules.Timeout;
	import org.junit.runner.RunWith;
	import org.junit.runners.Parameterized;
	import org.junit.runners.Parameterized.Parameters;
	import org.junit.Test;

	@TargetApi(24)
	@RunWith(Parameterized.class)
	public class DecodeAccuracyTest extends DecodeAccuracyTestBase {

	private static final String TAG = DecodeAccuracyTest.class.getSimpleName();
	private static final Field[] fields = R.raw.class.getFields();
	private static final int ALLOWED_GREATEST_PIXEL_DIFFERENCE = 90;
	private static final int OFFSET = 10;
	private static final long PER_TEST_TIMEOUT_MS = 60000;
	private static final String[] VIDEO_FILES = {
	// 144p
	"video_decode_accuracy_and_capability-h264_256x108_30fps.mp4",
	"video_decode_accuracy_and_capability-h264_256x144_30fps.mp4",
	"video_decode_accuracy_and_capability-h264_192x144_30fps.mp4",
	"video_decode_accuracy_and_capability-h264_82x144_30fps.mp4",
	"video_decode_accuracy_and_capability-vp9_256x108_30fps.webm",
	"video_decode_accuracy_and_capability-vp9_256x144_30fps.webm",
	"video_decode_accuracy_and_capability-vp9_192x144_30fps.webm",
	"video_decode_accuracy_and_capability-vp9_82x144_30fps.webm",
	// 240p
	"video_decode_accuracy_and_capability-h264_426x182_30fps.mp4",
	"video_decode_accuracy_and_capability-h264_426x240_30fps.mp4",
	"video_decode_accuracy_and_capability-h264_320x240_30fps.mp4",
	"video_decode_accuracy_and_capability-h264_136x240_30fps.mp4",
	"video_decode_accuracy_and_capability-vp9_426x182_30fps.webm",
	"video_decode_accuracy_and_capability-vp9_426x240_30fps.webm",
	"video_decode_accuracy_and_capability-vp9_320x240_30fps.webm",
	"video_decode_accuracy_and_capability-vp9_136x240_30fps.webm",
	// 360p
	"video_decode_accuracy_and_capability-h264_640x272_30fps.mp4",
	"video_decode_accuracy_and_capability-h264_640x360_30fps.mp4",
	"video_decode_accuracy_and_capability-h264_480x360_30fps.mp4",
	"video_decode_accuracy_and_capability-h264_202x360_30fps.mp4",
	"video_decode_accuracy_and_capability-vp9_640x272_30fps.webm",
	"video_decode_accuracy_and_capability-vp9_640x360_30fps.webm",
	"video_decode_accuracy_and_capability-vp9_480x360_30fps.webm",
	"video_decode_accuracy_and_capability-vp9_202x360_30fps.webm",
	// 480p
	"video_decode_accuracy_and_capability-h264_854x362_30fps.mp4",
	"video_decode_accuracy_and_capability-h264_854x480_30fps.mp4",
	"video_decode_accuracy_and_capability-h264_640x480_30fps.mp4",
	"video_decode_accuracy_and_capability-h264_270x480_30fps.mp4",
	"video_decode_accuracy_and_capability-vp9_854x362_30fps.webm",
	"video_decode_accuracy_and_capability-vp9_854x480_30fps.webm",
	"video_decode_accuracy_and_capability-vp9_640x480_30fps.webm",
	"video_decode_accuracy_and_capability-vp9_270x480_30fps.webm",
	// 720p
	"video_decode_accuracy_and_capability-h264_1280x544_30fps.mp4",
	"video_decode_accuracy_and_capability-h264_1280x720_30fps.mp4",
	"video_decode_accuracy_and_capability-h264_960x720_30fps.mp4",
	"video_decode_accuracy_and_capability-h264_406x720_30fps.mp4",
	"video_decode_accuracy_and_capability-vp9_1280x544_30fps.webm",
	"video_decode_accuracy_and_capability-vp9_1280x720_30fps.webm",
	"video_decode_accuracy_and_capability-vp9_960x720_30fps.webm",
	"video_decode_accuracy_and_capability-vp9_406x720_30fps.webm",
	// 1080p
	"video_decode_accuracy_and_capability-h264_1920x818_30fps.mp4",
	"video_decode_accuracy_and_capability-h264_1920x1080_30fps.mp4",
	"video_decode_accuracy_and_capability-h264_1440x1080_30fps.mp4",
	"video_decode_accuracy_and_capability-h264_608x1080_30fps.mp4",
	"video_decode_accuracy_and_capability-vp9_1920x818_30fps.webm",
	"video_decode_accuracy_and_capability-vp9_1920x1080_30fps.webm",
	"video_decode_accuracy_and_capability-vp9_1440x1080_30fps.webm",
	"video_decode_accuracy_and_capability-vp9_608x1080_30fps.webm",
	// 1440p
	"video_decode_accuracy_and_capability-h264_2560x1090_30fps.mp4",
	"video_decode_accuracy_and_capability-h264_2560x1440_30fps.mp4",
	"video_decode_accuracy_and_capability-h264_1920x1440_30fps.mp4",
	"video_decode_accuracy_and_capability-h264_810x1440_30fps.mp4",
	"video_decode_accuracy_and_capability-vp9_2560x1090_30fps.webm",
	"video_decode_accuracy_and_capability-vp9_2560x1440_30fps.webm",
	"video_decode_accuracy_and_capability-vp9_1920x1440_30fps.webm",
	"video_decode_accuracy_and_capability-vp9_810x1440_30fps.webm",
	// 2160p
	"video_decode_accuracy_and_capability-h264_3840x1634_30fps.mp4",
	"video_decode_accuracy_and_capability-h264_3840x2160_30fps.mp4",
	"video_decode_accuracy_and_capability-h264_2880x2160_30fps.mp4",
	"video_decode_accuracy_and_capability-h264_1216x2160_30fps.mp4",
	"video_decode_accuracy_and_capability-vp9_3840x1634_30fps.webm",
	"video_decode_accuracy_and_capability-vp9_3840x2160_30fps.webm",
	"video_decode_accuracy_and_capability-vp9_2880x2160_30fps.webm",
	"video_decode_accuracy_and_capability-vp9_1216x2160_30fps.webm",
	// cropped
	"video_decode_with_cropping-h264_520x360_30fps.mp4",
	"video_decode_with_cropping-vp9_520x360_30fps.webm"
	};

	private View videoView;
	private VideoViewFactory videoViewFactory;
	private String fileName;
	private SimplePlayer player;

	@After
	@Override
	public void tearDown() throws Exception {
	if (player != null) {
	player.release();
	}
	if (videoView != null) {
	getHelper().cleanUpView(videoView);
	}
	if (videoViewFactory != null) {
	videoViewFactory.release();
	}
	super.tearDown();
	}

	@Parameters
	public static Collection<Object[]> data() {
	final List<Object[]> testParams = new ArrayList<>();
	for (int i = 0; i < VIDEO_FILES.length; i++) {
	final String file = VIDEO_FILES[i];
	Pattern regex = Pattern.compile("^\\w+-(\\w+)_\\d+fps.\\w+");
	Matcher matcher = regex.matcher(file);
	String testName = "";
	if (matcher.matches()) {
	testName = matcher.group(1);
	}
	testParams.add(new Object[] { testName.replace("_", " ").toUpperCase(), file });
	}
	return testParams;
	}

	public DecodeAccuracyTest(String testname, String fileName) {
	this.fileName = fileName;
	}

	@Test(timeout = PER_TEST_TIMEOUT_MS)
	public void testGLViewDecodeAccuracy() throws Exception {
	runTest(new GLSurfaceViewFactory(), new VideoFormat(fileName));
	}

	@Test(timeout = PER_TEST_TIMEOUT_MS)
	public void testGLViewLargerHeightDecodeAccuracy() throws Exception {
	runTest(new GLSurfaceViewFactory(), getLargerHeightVideoFormat(new VideoFormat(fileName)));
	}

	@Test(timeout = PER_TEST_TIMEOUT_MS)
	public void testGLViewLargerWidthDecodeAccuracy() throws Exception {
	runTest(new GLSurfaceViewFactory(), getLargerWidthVideoFormat(new VideoFormat(fileName)));
	}

	@Test(timeout = PER_TEST_TIMEOUT_MS)
	public void testSurfaceViewVideoDecodeAccuracy() throws Exception {
	runTest(new SurfaceViewFactory(), new VideoFormat(fileName));
	}

	@Test(timeout = PER_TEST_TIMEOUT_MS)
	public void testSurfaceViewLargerHeightDecodeAccuracy() throws Exception {
	runTest(new SurfaceViewFactory(), getLargerHeightVideoFormat(new VideoFormat(fileName)));
	}

	@Test(timeout = PER_TEST_TIMEOUT_MS)
	public void testSurfaceViewLargerWidthDecodeAccuracy() throws Exception {
	runTest(new SurfaceViewFactory(), getLargerWidthVideoFormat(new VideoFormat(fileName)));
	}

	private void runTest(VideoViewFactory videoViewFactory, VideoFormat vf) {
	Log.i(TAG, "Running test for " + vf.toPrettyString());
	if (!MediaUtils.canDecodeVideo(vf.getMimeType(), vf.getWidth(), vf.getHeight(), 30)) {
	MediaUtils.skipTest(TAG, "No supported codec is found.");
	return;
	}
	this.videoViewFactory = checkNotNull(videoViewFactory);
	this.videoView = videoViewFactory.createView(getHelper().getContext());
	final int maxRetries = 3;
	for (int retry = 1; retry <= maxRetries; retry++) {
	// If view is intended and available to display.
	if (videoView != null) {
	getHelper().generateView(videoView);
	}
	try {
	videoViewFactory.waitForViewIsAvailable();
	break;
	} catch (Exception exception) {
	Log.e(TAG, exception.getMessage());
	if (retry == maxRetries) {
	fail("Timeout waiting for a valid surface.");
	} else {
	Log.w(TAG, "Try again...");
	bringActivityToFront();
	}
	}
	}
	final int golden = getGoldenId(vf.getDescription(), vf.getOriginalSize());
	assertTrue("No golden found.", golden != 0);
	decodeVideo(vf, videoViewFactory);
	validateResult(vf, videoViewFactory.getVideoViewSnapshot(), golden);
	}

	private void decodeVideo(VideoFormat videoFormat, VideoViewFactory videoViewFactory) {
	this.player = new SimplePlayer(getHelper().getContext());
	final SimplePlayer.PlayerResult playerResult = player.decodeVideoFrames(
	videoViewFactory.getSurface(), videoFormat, 10);
	assertTrue(playerResult.getFailureMessage(), playerResult.isSuccess());
	}

	private void validateResult(
	VideoFormat videoFormat, VideoViewSnapshot videoViewSnapshot, int goldenId) {
	final Bitmap result = checkNotNull("The expected bitmap from snapshot is null",
	getHelper().generateBitmapFromVideoViewSnapshot(videoViewSnapshot));
	final Bitmap golden = getHelper().generateBitmapFromImageResourceId(goldenId);
	final BitmapCompare.Difference difference = BitmapCompare.computeMinimumDifference(
	result, golden, videoFormat.getOriginalWidth(), videoFormat.getOriginalHeight());
	assertTrue("With the best matched border crop ("
	+ difference.bestMatchBorderCrop.first + ", "
	+ difference.bestMatchBorderCrop.second + "), "
	+ "greatest pixel difference is "
	+ difference.greatestPixelDifference
	+ (difference.greatestPixelDifferenceCoordinates != null
	? " at (" + difference.greatestPixelDifferenceCoordinates.first + ", "
	+ difference.greatestPixelDifferenceCoordinates.second + ")" : "")
	+ " which is over the allowed difference " + ALLOWED_GREATEST_PIXEL_DIFFERENCE,
	difference.greatestPixelDifference <= ALLOWED_GREATEST_PIXEL_DIFFERENCE);
	}

	private static VideoFormat getLargerHeightVideoFormat(VideoFormat videoFormat) {
	return new VideoFormat(videoFormat) {
	@Override
	public int getHeight() {
	return super.getHeight() + OFFSET;
	}

	@Override
	public boolean isAbrEnabled() {
	return true;
	}
	};
	}

	private static VideoFormat getLargerWidthVideoFormat(VideoFormat videoFormat) {
	return new VideoFormat(videoFormat) {
	@Override
	public int getWidth() {
	return super.getWidth() + OFFSET;
	}

	@Override
	public boolean isAbrEnabled() {
	return true;
	}
	};
	}

	/**
	* Returns the resource id by matching parts of the video and golden file name.
	*/
	private static int getGoldenId(String description, String size) {
	for (Field field : fields) {
	try {
	final String name = field.getName();
	if (name.contains("golden") && name.contains(description) && name.contains(size)) {
	int id = field.getInt(null);
	return field.getInt(null);
	}
	} catch (IllegalAccessException \| NullPointerException e) {
	// No file found.
	}
	}
	return 0;
	}

	}