Remove some occurrences of dummy

Remove occurrences in comments and private fields.

ISSUE: #7565
PiperOrigin-RevId: 320948364

library/common/src/main/java/com/google/android/exoplayer2/C.java

@@ -690,7 +690,7 @@ public final class C {
   public static final int TRACK_TYPE_METADATA = 4;
   /** A type constant for camera motion tracks. */
   public static final int TRACK_TYPE_CAMERA_MOTION = 5;
-  /** A type constant for a dummy or empty track. */
+  /** A type constant for a fake or empty track. */
   public static final int TRACK_TYPE_NONE = 6;
   /**
    * Applications or extensions may define custom {@code TRACK_TYPE_*} constants greater than or

library/dash/src/test/java/com/google/android/exoplayer2/source/dash/manifest/DashManifestTest.java

@@ -33,9 +33,9 @@ import org.junit.runner.RunWith;
 @RunWith(AndroidJUnit4.class)
 public class DashManifestTest {
 
-  private static final UtcTimingElement DUMMY_UTC_TIMING = new UtcTimingElement("", "");
+  private static final UtcTimingElement UTC_TIMING = new UtcTimingElement("", "");
-  private static final SingleSegmentBase DUMMY_SEGMENT_BASE = new SingleSegmentBase();
+  private static final SingleSegmentBase SEGMENT_BASE = new SingleSegmentBase();
-  private static final Format DUMMY_FORMAT = new Format.Builder().build();
+  private static final Format FORMAT = new Format.Builder().build();
 
   @Test
   public void copy() {
@@ -214,8 +214,7 @@ public class DashManifestTest {
   }
 
   private static Representation newRepresentation() {
-    return Representation.newInstance(
+    return Representation.newInstance(/* revisionId= */ 0, FORMAT, /* baseUrl= */ "", SEGMENT_BASE);
-        /* revisionId= */ 0, DUMMY_FORMAT, /* baseUrl= */ "", DUMMY_SEGMENT_BASE);
   }
 
   private static DashManifest newDashManifest(int duration, Period... periods) {
@@ -229,7 +228,7 @@ public class DashManifestTest {
         /* suggestedPresentationDelayMs= */ 4,
         /* publishTimeMs= */ 12345,
         /* programInformation= */ null,
-        DUMMY_UTC_TIMING,
+        UTC_TIMING,
         Uri.EMPTY,
         Arrays.asList(periods));
   }

library/dash/src/test/java/com/google/android/exoplayer2/source/dash/offline/DownloadManagerDashTest.java

@@ -72,12 +72,12 @@ public class DownloadManagerDashTest {
   private StreamKey fakeStreamKey2;
   private TestDownloadManagerListener downloadManagerListener;
   private DefaultDownloadIndex downloadIndex;
-  private DummyMainThread dummyMainThread;
+  private DummyMainThread testThread;
 
   @Before
   public void setUp() throws Exception {
     ShadowLog.stream = System.out;
-    dummyMainThread = new DummyMainThread();
+    testThread = new DummyMainThread();
     Context context = ApplicationProvider.getApplicationContext();
     tempFolder = Util.createTempDirectory(context, "ExoPlayerTest");
     File cacheFolder = new File(tempFolder, "cache");
@@ -105,7 +105,7 @@ public class DownloadManagerDashTest {
   public void tearDown() {
     runOnMainThread(() -> downloadManager.release());
     Util.recursiveDelete(tempFolder);
-    dummyMainThread.release();
+    testThread.release();
   }
 
   // Disabled due to flakiness.
@@ -144,7 +144,7 @@ public class DownloadManagerDashTest {
     // Revert fakeDataSet to normal.
     fakeDataSet.setData(TEST_MPD_URI, TEST_MPD);
 
-    dummyMainThread.runOnMainThread(this::createDownloadManager);
+    testThread.runOnMainThread(this::createDownloadManager);
 
     // Block on the test thread.
     downloadManagerListener.blockUntilIdleAndThrowAnyFailure();
@@ -252,6 +252,6 @@ public class DownloadManagerDashTest {
   }
 
   private void runOnMainThread(TestRunnable r) {
-    dummyMainThread.runTestOnMainThread(r);
+    testThread.runTestOnMainThread(r);
   }
 }

library/dash/src/test/java/com/google/android/exoplayer2/source/dash/offline/DownloadServiceDashTest.java

@@ -72,11 +72,11 @@ public class DownloadServiceDashTest {
   private DownloadService dashDownloadService;
   private ConditionVariable pauseDownloadCondition;
   private TestDownloadManagerListener downloadManagerListener;
-  private DummyMainThread dummyMainThread;
+  private DummyMainThread testThread;
 
   @Before
   public void setUp() throws IOException {
-    dummyMainThread = new DummyMainThread();
+    testThread = new DummyMainThread();
     context = ApplicationProvider.getApplicationContext();
     tempFolder = Util.createTempDirectory(context, "ExoPlayerTest");
     cache = new SimpleCache(tempFolder, new NoOpCacheEvictor());
@@ -109,7 +109,7 @@ public class DownloadServiceDashTest {
     fakeStreamKey1 = new StreamKey(0, 0, 0);
     fakeStreamKey2 = new StreamKey(0, 1, 0);
 
-    dummyMainThread.runTestOnMainThread(
+    testThread.runTestOnMainThread(
         () -> {
           DefaultDownloadIndex downloadIndex =
               new DefaultDownloadIndex(TestUtil.getInMemoryDatabaseProvider());
@@ -148,9 +148,9 @@ public class DownloadServiceDashTest {
 
   @After
   public void tearDown() {
-    dummyMainThread.runOnMainThread(() -> dashDownloadService.onDestroy());
+    testThread.runOnMainThread(() -> dashDownloadService.onDestroy());
     Util.recursiveDelete(tempFolder);
-    dummyMainThread.release();
+    testThread.release();
   }
 
   @Ignore // b/78877092
@@ -192,7 +192,7 @@ public class DownloadServiceDashTest {
   }
 
   private void removeAll() {
-    dummyMainThread.runOnMainThread(
+    testThread.runOnMainThread(
         () -> {
           Intent startIntent =
               DownloadService.buildRemoveDownloadIntent(
@@ -212,7 +212,7 @@ public class DownloadServiceDashTest {
             keysList,
             /* customCacheKey= */ null,
             null);
-    dummyMainThread.runOnMainThread(
+    testThread.runOnMainThread(
         () -> {
           Intent startIntent =
               DownloadService.buildAddDownloadIntent(

library/extractor/src/main/java/com/google/android/exoplayer2/extractor/DummyExtractorOutput.java

@@ -15,7 +15,7 @@
  */
 package com.google.android.exoplayer2.extractor;
 
-/** A dummy {@link ExtractorOutput} implementation. */
+/** A fake {@link ExtractorOutput} implementation. */
 public final class DummyExtractorOutput implements ExtractorOutput {
 
   @Override

library/extractor/src/main/java/com/google/android/exoplayer2/extractor/DummyTrackOutput.java

@@ -23,9 +23,7 @@ import com.google.android.exoplayer2.util.ParsableByteArray;
 import java.io.EOFException;
 import java.io.IOException;
 
-/**
+/** A fake {@link TrackOutput} implementation. */
- * A dummy {@link TrackOutput} implementation.
- */
 public final class DummyTrackOutput implements TrackOutput {
 
   // Even though read data is discarded, data source implementations could be making use of the

library/extractor/src/main/java/com/google/android/exoplayer2/extractor/mkv/MatroskaExtractor.java

@@ -246,8 +246,8 @@ public class MatroskaExtractor implements Extractor {
    * <p>The display time of each subtitle is passed as {@code timeUs} to {@link
    * TrackOutput#sampleMetadata}. The start and end timecodes in this template are relative to
    * {@code timeUs}. Hence the start timecode is always zero. The 12 byte end timecode starting at
-   * {@link #SUBRIP_PREFIX_END_TIMECODE_OFFSET} is set to a dummy value, and must be replaced with
+   * {@link #SUBRIP_PREFIX_END_TIMECODE_OFFSET} is set to a placeholder value, and must be replaced
-   * the duration of the subtitle.
+   * with the duration of the subtitle.
    *
    * <p>Equivalent to the UTF-8 string: "1\n00:00:00,000 --> 00:00:00,000\n".
    */
@@ -281,8 +281,8 @@ public class MatroskaExtractor implements Extractor {
    * <p>The display time of each subtitle is passed as {@code timeUs} to {@link
    * TrackOutput#sampleMetadata}. The start and end timecodes in this template are relative to
    * {@code timeUs}. Hence the start timecode is always zero. The 12 byte end timecode starting at
-   * {@link #SUBRIP_PREFIX_END_TIMECODE_OFFSET} is set to a dummy value, and must be replaced with
+   * {@link #SUBRIP_PREFIX_END_TIMECODE_OFFSET} is set to a placeholder value, and must be replaced
-   * the duration of the subtitle.
+   * with the duration of the subtitle.
    *
    * <p>Equivalent to the UTF-8 string: "Dialogue: 0:00:00:00,0:00:00:00,".
    */

library/extractor/src/main/java/com/google/android/exoplayer2/extractor/ts/TsExtractor.java

@@ -576,8 +576,8 @@ public final class TsExtractor implements Extractor {
       if (mode == MODE_HLS && id3Reader == null) {
         // Setup an ID3 track regardless of whether there's a corresponding entry, in case one
         // appears intermittently during playback. See [Internal: b/20261500].
-        EsInfo dummyEsInfo = new EsInfo(TS_STREAM_TYPE_ID3, null, null, Util.EMPTY_BYTE_ARRAY);
+        EsInfo id3EsInfo = new EsInfo(TS_STREAM_TYPE_ID3, null, null, Util.EMPTY_BYTE_ARRAY);
-        id3Reader = payloadReaderFactory.createPayloadReader(TS_STREAM_TYPE_ID3, dummyEsInfo);
+        id3Reader = payloadReaderFactory.createPayloadReader(TS_STREAM_TYPE_ID3, id3EsInfo);
         id3Reader.init(timestampAdjuster, output,
             new TrackIdGenerator(programNumber, TS_STREAM_TYPE_ID3, MAX_PID_PLUS_ONE));
       }

library/hls/src/main/java/com/google/android/exoplayer2/source/hls/BundledHlsMediaChunkExtractor.java

@@ -37,7 +37,7 @@ import java.io.IOException;
  */
 public final class BundledHlsMediaChunkExtractor implements HlsMediaChunkExtractor {
 
-  private static final PositionHolder DUMMY_POSITION_HOLDER = new PositionHolder();
+  private static final PositionHolder POSITION_HOLDER = new PositionHolder();
 
   @VisibleForTesting /* package */ final Extractor extractor;
   private final Format masterPlaylistFormat;
@@ -64,7 +64,7 @@ public final class BundledHlsMediaChunkExtractor implements HlsMediaChunkExtract
 
   @Override
   public boolean read(ExtractorInput extractorInput) throws IOException {
-    return extractor.read(extractorInput, DUMMY_POSITION_HOLDER) == Extractor.RESULT_CONTINUE;
+    return extractor.read(extractorInput, POSITION_HOLDER) == Extractor.RESULT_CONTINUE;
   }
 
   @Override

library/hls/src/main/java/com/google/android/exoplayer2/source/hls/HlsSampleStreamWrapper.java

@@ -941,7 +941,7 @@ import org.checkerframework.checker.nullness.qual.RequiresNonNull;
 
     if (trackOutput == null) {
       if (tracksEnded) {
-        return createDummyTrackOutput(id, type);
+        return createFakeTrackOutput(id, type);
       } else {
         // The relevant SampleQueue hasn't been constructed yet - so construct it.
         trackOutput = createSampleQueue(id, type);
@@ -985,7 +985,7 @@ import org.checkerframework.checker.nullness.qual.RequiresNonNull;
     }
     return sampleQueueTrackIds[sampleQueueIndex] == id
         ? sampleQueues[sampleQueueIndex]
-        : createDummyTrackOutput(id, type);
+        : createFakeTrackOutput(id, type);
   }
 
   private SampleQueue createSampleQueue(int id, int type) {
@@ -1459,7 +1459,7 @@ import org.checkerframework.checker.nullness.qual.RequiresNonNull;
     return true;
   }
 
-  private static DummyTrackOutput createDummyTrackOutput(int id, int type) {
+  private static DummyTrackOutput createFakeTrackOutput(int id, int type) {
     Log.w(TAG, "Unmapped track with id " + id + " of type " + type);
     return new DummyTrackOutput();
   }

library/hls/src/test/java/com/google/android/exoplayer2/source/hls/playlist/HlsMediaPlaylistParserTest.java

@@ -321,7 +321,7 @@ public class HlsMediaPlaylistParserTest {
             + "#EXT-X-KEY:METHOD=NONE\n"
             + "#EXTINF:5.005,\n"
             + "#EXT-X-GAP \n"
-            + "../dummy.ts\n"
+            + "../test.ts\n"
             + "#EXT-X-KEY:METHOD=AES-128,URI=\"https://key-service.bamgrid.com/1.0/key?"
             + "hex-value=9FB8989D15EEAAF8B21B860D7ED3072A\",IV=0x410C8AC18AA42EFA18B5155484F5FC34\n"
             + "#EXTINF:5.005,\n"

library/ui/src/test/java/com/google/android/exoplayer2/ui/spherical/TouchTrackerTest.java

@@ -35,7 +35,7 @@ public class TouchTrackerTest {
   private TouchTracker tracker;
   private float yaw;
   private float pitch;
-  private float[] dummyMatrix;
+  private float[] matrix;
 
   private static void swipe(TouchTracker tracker, float x0, float y0, float x1, float y1) {
     tracker.onTouch(null, MotionEvent.obtain(0, 0, MotionEvent.ACTION_DOWN, x0, y0, 0));
@@ -54,8 +54,8 @@ public class TouchTrackerTest {
               yaw = scrollOffsetDegrees.x;
             },
             PX_PER_DEGREES);
-    dummyMatrix = new float[16];
+    matrix = new float[16];
-    tracker.onOrientationChange(dummyMatrix, 0);
+    tracker.onOrientationChange(matrix, 0);
   }
 
   @Test
@@ -111,7 +111,7 @@ public class TouchTrackerTest {
 
   @Test
   public void withRoll90() {
-    tracker.onOrientationChange(dummyMatrix, (float) Math.toRadians(90));
+    tracker.onOrientationChange(matrix, (float) Math.toRadians(90));
 
     // Y-axis should now control yaw.
     swipe(tracker, 0, 0, 0, 2 * SWIPE_PX);
@@ -124,7 +124,7 @@ public class TouchTrackerTest {
 
   @Test
   public void withRoll180() {
-    tracker.onOrientationChange(dummyMatrix, (float) Math.toRadians(180));
+    tracker.onOrientationChange(matrix, (float) Math.toRadians(180));
 
     // X-axis should now control reverse yaw.
     swipe(tracker, 0, 0, -2 * SWIPE_PX, 0);
@@ -137,7 +137,7 @@ public class TouchTrackerTest {
 
   @Test
   public void withRoll270() {
-    tracker.onOrientationChange(dummyMatrix, (float) Math.toRadians(270));
+    tracker.onOrientationChange(matrix, (float) Math.toRadians(270));
 
     // Y-axis should now control reverse yaw.
     swipe(tracker, 0, 0, 0, -2 * SWIPE_PX);

testdata/src/test/assets/mpd/sample_mpd_asset_identifier

@@ -11,13 +11,13 @@
    <Role schemeIdUri="urn:mpeg:DASH:role:2011" value="main"/>
    <Representation id="140" codecs="mp4a.40.2" audioSamplingRate="48000" startWithSAP="1" bandwidth="144000">
     <AudioChannelConfiguration schemeIdUri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="2"/>
-    <BaseURL>http://www.dummy.url/</BaseURL>
+    <BaseURL>http://www.test.url/</BaseURL>
    </Representation>
   </AdaptationSet>
   <AdaptationSet id="1" mimeType="video/mp4" subsegmentAlignment="true">
    <Role schemeIdUri="urn:mpeg:DASH:role:2011" value="main"/>
    <Representation id="133" codecs="avc1.4d4015" width="426" height="240" startWithSAP="1" maxPlayoutRate="1" bandwidth="258000" frameRate="30">
-    <BaseURL>http://www.dummy.url/</BaseURL>
+    <BaseURL>http://www.test.url/</BaseURL>
    </Representation>
   </AdaptationSet>
  </Period>

testdata/src/test/assets/mpd/sample_mpd_event_stream

@@ -33,13 +33,13 @@
    <Role schemeIdUri="urn:mpeg:DASH:role:2011" value="main"/>
    <Representation id="140" codecs="mp4a.40.2" audioSamplingRate="48000" startWithSAP="1" bandwidth="144000">
     <AudioChannelConfiguration schemeIdUri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="2"/>
-    <BaseURL>http://www.dummy.url/</BaseURL>
+    <BaseURL>http://www.test.url/</BaseURL>
    </Representation>
   </AdaptationSet>
   <AdaptationSet id="1" mimeType="video/mp4" subsegmentAlignment="true">
    <Role schemeIdUri="urn:mpeg:DASH:role:2011" value="main"/>
    <Representation id="133" codecs="avc1.4d4015" width="426" height="240" startWithSAP="1" maxPlayoutRate="1" bandwidth="258000" frameRate="30">
-    <BaseURL>http://www.dummy.url/</BaseURL>
+    <BaseURL>http://www.test.url/</BaseURL>
    </Representation>
   </AdaptationSet>
  </Period>

testutils/src/main/java/com/google/android/exoplayer2/testutil/FakeTimeline.java

@@ -52,8 +52,7 @@ public final class FakeTimeline extends Timeline {
     public final AdPlaybackState adPlaybackState;
 
     /**
-     * Creates a window definition that corresponds to a dummy placeholder timeline using the given
+     * Creates a window definition that corresponds to a placeholder timeline using the given tag.
-     * tag.
      *
      * @param tag The tag to use in the timeline.
      */

testutils/src/main/java/com/google/android/exoplayer2/testutil/MediaPeriodAsserts.java

@@ -199,9 +199,9 @@ public final class MediaPeriodAsserts {
 
   private static TrackGroupArray prepareAndGetTrackGroups(MediaPeriod mediaPeriod) {
     AtomicReference<TrackGroupArray> trackGroupArray = new AtomicReference<>();
-    DummyMainThread dummyMainThread = new DummyMainThread();
+    DummyMainThread testThread = new DummyMainThread();
     ConditionVariable preparedCondition = new ConditionVariable();
-    dummyMainThread.runOnMainThread(
+    testThread.runOnMainThread(
         () ->
             mediaPeriod.prepare(
                 new Callback() {
@@ -222,7 +222,7 @@ public final class MediaPeriodAsserts {
     } catch (InterruptedException e) {
       // Ignore.
     }
-    dummyMainThread.release();
+    testThread.release();
     return trackGroupArray.get();
   }
 

testutils/src/main/java/com/google/android/exoplayer2/testutil/TestUtil.java

@@ -198,17 +198,17 @@ public class TestUtil {
     return ImmutableList.copyOf(Bytes.asList(createByteArray(bytes)));
   }
 
-  /** Writes one byte long dummy test data to the file and returns it. */
+  /** Writes one byte long test data to the file and returns it. */
   public static File createTestFile(File directory, String name) throws IOException {
     return createTestFile(directory, name, /* length= */ 1);
   }
 
-  /** Writes dummy test data with the specified length to the file and returns it. */
+  /** Writes test data with the specified length to the file and returns it. */
   public static File createTestFile(File directory, String name, long length) throws IOException {
     return createTestFile(new File(directory, name), length);
   }
 
-  /** Writes dummy test data with the specified length to the file and returns it. */
+  /** Writes test data with the specified length to the file and returns it. */
   public static File createTestFile(File file, long length) throws IOException {
     FileOutputStream output = new FileOutputStream(file);
     for (long i = 0; i < length; i++) {

testutils/src/test/java/com/google/android/exoplayer2/testutil/FakeDataSourceTest.java

@@ -97,7 +97,7 @@ public final class FakeDataSourceTest {
   }
 
   @Test
-  public void testDummyData() throws IOException {
+  public void testFakeData() throws IOException {
     FakeDataSource dataSource =
         new FakeDataSource(
             new FakeDataSet()