Reverting breaking changes by keeping label and adding labels.

libraries/common/src/main/java/androidx/media3/common/Format.java

@@ -49,6 +49,7 @@ import java.util.UUID;
  *
  * <ul>
  *   <li>{@link #id}
+ *   <li>{@link #label}
  *   <li>{@link #labels}
  *   <li>{@link #language}
  *   <li>{@link #selectionFlags}
@@ -136,6 +137,8 @@ public final class Format implements Bundleable {
   public static final class Builder {
 
     @Nullable private String id;
+
+    @Nullable private String label;
     @Nullable private List<Label> labels;
     @Nullable private String language;
     private @C.SelectionFlags int selectionFlags;
@@ -224,6 +227,7 @@ public final class Format implements Bundleable {
      */
     private Builder(Format format) {
       this.id = format.id;
+      this.label = format.label;
       this.labels = format.labels;
       this.language = format.language;
       this.selectionFlags = format.selectionFlags;
@@ -290,6 +294,18 @@ public final class Format implements Bundleable {
       return this;
     }
 
+    /**
+     * Sets {@link Format#label}. The default value is {@code null}.
+     *
+     * @param label The {@link Format#label}.
+     * @return The builder.
+     */
+    @CanIgnoreReturnValue
+    public Builder setLabel(@Nullable String label) {
+      this.label = label;
+      return this;
+    }
+
     /**
      * Sets {@link Format#labels}. The default value is {@code null}.
      *
@@ -740,8 +756,15 @@ public final class Format implements Bundleable {
   /** An identifier for the format, or null if unknown or not applicable. */
   @Nullable public final String id;
 
-  /** The human readable label, or null if unknown or not applicable. */
+  /**
-  @Nullable public final List<Label> labels;
+   * The human readable label, or null if unknown or not applicable.
+   *
+   * @deprecated Use {@link #labels} instead.
+   */
+  @Deprecated @Nullable public final String label;
+
+  /** The human readable list of labels, or null if unknown or not applicable. */
+  @UnstableApi public final List<Label> labels;
 
   /** The language as an IETF BCP 47 conformant tag, or null if unknown or not applicable. */
   @Nullable public final String language;
@@ -931,7 +954,8 @@ public final class Format implements Bundleable {
 
   private Format(Builder builder) {
     id = builder.id;
-    labels = builder.labels;
+    label = builder.label;
+    labels = builder.labels == null ? Collections.emptyList() : builder.labels;
     language = Util.normalizeLanguageCode(builder.language);
     selectionFlags = builder.selectionFlags;
     roleFlags = builder.roleFlags;
@@ -1002,8 +1026,8 @@ public final class Format implements Bundleable {
     int tileCountVertical = manifestFormat.tileCountVertical;
 
     // Prefer manifest values, but fill in from sample format if missing.
-    @Nullable
+    @Nullable String label = manifestFormat.label != null ? manifestFormat.label : this.label;
-    List<Label> labels = manifestFormat.labels != null ? manifestFormat.labels : this.labels;
+    List<Label> labels = manifestFormat.labels;
     @Nullable String language = this.language;
     if ((trackType == C.TRACK_TYPE_TEXT || trackType == C.TRACK_TYPE_AUDIO)
         && manifestFormat.language != null) {
@@ -1044,6 +1068,7 @@ public final class Format implements Bundleable {
 
     return buildUpon()
         .setId(id)
+        .setLabel(label)
         .setLabels(labels)
         .setLanguage(language)
         .setSelectionFlags(selectionFlags)
@@ -1079,7 +1104,7 @@ public final class Format implements Bundleable {
     return "Format("
         + id
         + ", "
-        + labels
+        + label
         + ", "
         + containerMimeType
         + ", "
@@ -1112,7 +1137,8 @@ public final class Format implements Bundleable {
       // Some fields for which hashing is expensive are deliberately omitted.
       int result = 17;
       result = 31 * result + (id == null ? 0 : id.hashCode());
-      result = 31 * result + (labels != null ? labels.hashCode() : 0);
+      result = 31 * result + (label == null ? 0 : label.hashCode());
+      // [Omitted] labels.
       result = 31 * result + (language == null ? 0 : language.hashCode());
       result = 31 * result + selectionFlags;
       result = 31 * result + roleFlags;
@@ -1190,7 +1216,7 @@ public final class Format implements Bundleable {
         && Float.compare(frameRate, other.frameRate) == 0
         && Float.compare(pixelWidthHeightRatio, other.pixelWidthHeightRatio) == 0
         && Util.areEqual(id, other.id)
-        && Util.areEqual(labels, other.labels)
+        && Util.areEqual(label, other.label)
         && Util.areEqual(codecs, other.codecs)
         && Util.areEqual(containerMimeType, other.containerMimeType)
         && Util.areEqual(sampleMimeType, other.sampleMimeType)
@@ -1199,7 +1225,8 @@ public final class Format implements Bundleable {
         && Util.areEqual(metadata, other.metadata)
         && Util.areEqual(colorInfo, other.colorInfo)
         && Util.areEqual(drmInitData, other.drmInitData)
-        && initializationDataEquals(other);
+        && initializationDataEquals(other)
+        && labelsEquals(other);
   }
 
   /**
@@ -1223,6 +1250,32 @@ public final class Format implements Bundleable {
     return true;
   }
 
+  /**
+   * Returns whether the {@link #labels}s belonging to this format and {@code other} are equal.
+   *
+   * @param other The other format whose {@link #labels} is being compared.
+   * @return Whether the {@link #labels} belonging to this format and {@code other} are equal.
+   */
+  @UnstableApi
+  public boolean labelsEquals(Format other) {
+    if ((labels == null && other.labels != null) || (labels != null && other.labels == null)) {
+      return false;
+    }
+    if (labels == null && other.labels == null) {
+      return true;
+    }
+
+    if (labels.size() != other.labels.size()) {
+      return false;
+    }
+    for (int i = 0; i < labels.size(); i++) {
+      if (!Util.areEqual(labels.get(i), other.labels.get(i))) {
+        return false;
+      }
+    }
+    return true;
+  }
+
   // Utility methods
 
   /** Returns a prettier {@link String} than {@link #toString()}, intended for logging. */
@@ -1282,8 +1335,13 @@ public final class Format implements Bundleable {
     if (format.language != null) {
       builder.append(", language=").append(format.language);
     }
+    if (format.label != null) {
+      builder.append(", label=").append(format.label);
+    }
     if (format.labels != null) {
-      builder.append(", label=").append(format.labels);
+      builder.append(", labels=[");
+      Joiner.on(',').appendTo(builder, format.labels);
+      builder.append("]");
     }
     if (format.selectionFlags != 0) {
       builder.append(", selectionFlags=[");
@@ -1301,37 +1359,38 @@ public final class Format implements Bundleable {
   // Bundleable implementation.
 
   private static final String FIELD_ID = Util.intToStringMaxRadix(0);
-  private static final String FIELD_LABELS = Util.intToStringMaxRadix(1);
+  private static final String FIELD_LABEL = Util.intToStringMaxRadix(1);
-  private static final String FIELD_LANGUAGE = Util.intToStringMaxRadix(2);
+  private static final String FIELD_LABELS = Util.intToStringMaxRadix(2);
-  private static final String FIELD_SELECTION_FLAGS = Util.intToStringMaxRadix(3);
+  private static final String FIELD_LANGUAGE = Util.intToStringMaxRadix(3);
-  private static final String FIELD_ROLE_FLAGS = Util.intToStringMaxRadix(4);
+  private static final String FIELD_SELECTION_FLAGS = Util.intToStringMaxRadix(4);
-  private static final String FIELD_AVERAGE_BITRATE = Util.intToStringMaxRadix(5);
+  private static final String FIELD_ROLE_FLAGS = Util.intToStringMaxRadix(5);
-  private static final String FIELD_PEAK_BITRATE = Util.intToStringMaxRadix(6);
+  private static final String FIELD_AVERAGE_BITRATE = Util.intToStringMaxRadix(6);
-  private static final String FIELD_CODECS = Util.intToStringMaxRadix(7);
+  private static final String FIELD_PEAK_BITRATE = Util.intToStringMaxRadix(7);
-  private static final String FIELD_METADATA = Util.intToStringMaxRadix(8);
+  private static final String FIELD_CODECS = Util.intToStringMaxRadix(8);
-  private static final String FIELD_CONTAINER_MIME_TYPE = Util.intToStringMaxRadix(9);
+  private static final String FIELD_METADATA = Util.intToStringMaxRadix(9);
-  private static final String FIELD_SAMPLE_MIME_TYPE = Util.intToStringMaxRadix(10);
+  private static final String FIELD_CONTAINER_MIME_TYPE = Util.intToStringMaxRadix(10);
-  private static final String FIELD_MAX_INPUT_SIZE = Util.intToStringMaxRadix(11);
+  private static final String FIELD_SAMPLE_MIME_TYPE = Util.intToStringMaxRadix(11);
-  private static final String FIELD_INITIALIZATION_DATA = Util.intToStringMaxRadix(12);
+  private static final String FIELD_MAX_INPUT_SIZE = Util.intToStringMaxRadix(12);
-  private static final String FIELD_DRM_INIT_DATA = Util.intToStringMaxRadix(13);
+  private static final String FIELD_INITIALIZATION_DATA = Util.intToStringMaxRadix(13);
-  private static final String FIELD_SUBSAMPLE_OFFSET_US = Util.intToStringMaxRadix(14);
+  private static final String FIELD_DRM_INIT_DATA = Util.intToStringMaxRadix(14);
-  private static final String FIELD_WIDTH = Util.intToStringMaxRadix(15);
+  private static final String FIELD_SUBSAMPLE_OFFSET_US = Util.intToStringMaxRadix(15);
-  private static final String FIELD_HEIGHT = Util.intToStringMaxRadix(16);
+  private static final String FIELD_WIDTH = Util.intToStringMaxRadix(16);
-  private static final String FIELD_FRAME_RATE = Util.intToStringMaxRadix(17);
+  private static final String FIELD_HEIGHT = Util.intToStringMaxRadix(17);
-  private static final String FIELD_ROTATION_DEGREES = Util.intToStringMaxRadix(18);
+  private static final String FIELD_FRAME_RATE = Util.intToStringMaxRadix(18);
-  private static final String FIELD_PIXEL_WIDTH_HEIGHT_RATIO = Util.intToStringMaxRadix(19);
+  private static final String FIELD_ROTATION_DEGREES = Util.intToStringMaxRadix(19);
-  private static final String FIELD_PROJECTION_DATA = Util.intToStringMaxRadix(20);
+  private static final String FIELD_PIXEL_WIDTH_HEIGHT_RATIO = Util.intToStringMaxRadix(20);
-  private static final String FIELD_STEREO_MODE = Util.intToStringMaxRadix(21);
+  private static final String FIELD_PROJECTION_DATA = Util.intToStringMaxRadix(21);
-  private static final String FIELD_COLOR_INFO = Util.intToStringMaxRadix(22);
+  private static final String FIELD_STEREO_MODE = Util.intToStringMaxRadix(22);
-  private static final String FIELD_CHANNEL_COUNT = Util.intToStringMaxRadix(23);
+  private static final String FIELD_COLOR_INFO = Util.intToStringMaxRadix(23);
-  private static final String FIELD_SAMPLE_RATE = Util.intToStringMaxRadix(24);
+  private static final String FIELD_CHANNEL_COUNT = Util.intToStringMaxRadix(24);
-  private static final String FIELD_PCM_ENCODING = Util.intToStringMaxRadix(25);
+  private static final String FIELD_SAMPLE_RATE = Util.intToStringMaxRadix(25);
-  private static final String FIELD_ENCODER_DELAY = Util.intToStringMaxRadix(26);
+  private static final String FIELD_PCM_ENCODING = Util.intToStringMaxRadix(26);
-  private static final String FIELD_ENCODER_PADDING = Util.intToStringMaxRadix(27);
+  private static final String FIELD_ENCODER_DELAY = Util.intToStringMaxRadix(27);
-  private static final String FIELD_ACCESSIBILITY_CHANNEL = Util.intToStringMaxRadix(28);
+  private static final String FIELD_ENCODER_PADDING = Util.intToStringMaxRadix(28);
-  private static final String FIELD_CRYPTO_TYPE = Util.intToStringMaxRadix(29);
+  private static final String FIELD_ACCESSIBILITY_CHANNEL = Util.intToStringMaxRadix(29);
-  private static final String FIELD_TILE_COUNT_HORIZONTAL = Util.intToStringMaxRadix(30);
+  private static final String FIELD_CRYPTO_TYPE = Util.intToStringMaxRadix(30);
-  private static final String FIELD_TILE_COUNT_VERTICAL = Util.intToStringMaxRadix(31);
+  private static final String FIELD_TILE_COUNT_HORIZONTAL = Util.intToStringMaxRadix(31);
+  private static final String FIELD_TILE_COUNT_VERTICAL = Util.intToStringMaxRadix(32);
 
   @UnstableApi
   @Override
@@ -1347,6 +1406,7 @@ public final class Format implements Bundleable {
   public Bundle toBundle(boolean excludeMetadata) {
     Bundle bundle = new Bundle();
     bundle.putString(FIELD_ID, id);
+    bundle.putString(FIELD_LABEL, label);
     if (labels != null) {
       for (int i = 0; i < labels.size(); i++) {
         bundle.putParcelable(keyForLabel(i), labels.get(i));
@@ -1416,8 +1476,9 @@ public final class Format implements Bundleable {
   public static Format fromBundle(Bundle bundle) {
     Builder builder = new Builder();
     BundleCollectionUtil.ensureClassLoader(bundle);
-    builder.setId(defaultIfNull(bundle.getString(FIELD_ID), DEFAULT.id));
+    builder
-
+        .setId(defaultIfNull(bundle.getString(FIELD_ID), DEFAULT.id))
+        .setLabel(defaultIfNull(bundle.getString(FIELD_LABEL), DEFAULT.label));
     List<Label> labels = new ArrayList<>();
     for (int i = 0; ; i++) {
       @Nullable Label label = bundle.getParcelable(keyForLabel(i));

libraries/common/src/test/java/androidx/media3/common/FormatTest.java

@@ -87,6 +87,7 @@ public final class FormatTest {
     labels.add(new Label("id", "en", "label"));
     return new Format.Builder()
         .setId("id")
+        .setLabel("label")
         .setLabels(labels)
         .setLanguage("language")
         .setSelectionFlags(C.SELECTION_FLAG_DEFAULT)

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/audio/DecoderAudioRenderer.java

@@ -450,6 +450,7 @@ public abstract class DecoderAudioRenderer<
               .setEncoderPadding(encoderPadding)
               .setMetadata(inputFormat.metadata)
               .setId(inputFormat.id)
+              .setLabel(inputFormat.label)
               .setLabels(inputFormat.labels)
               .setLanguage(inputFormat.language)
               .setSelectionFlags(inputFormat.selectionFlags)

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/audio/MediaCodecAudioRenderer.java

@@ -551,6 +551,7 @@ public class MediaCodecAudioRenderer extends MediaCodecRenderer implements Media
               .setEncoderPadding(format.encoderPadding)
               .setMetadata(format.metadata)
               .setId(format.id)
+              .setLabel(format.label)
               .setLabels(format.labels)
               .setLanguage(format.language)
               .setSelectionFlags(format.selectionFlags)

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/source/DefaultMediaSourceFactory.java

@@ -519,8 +519,6 @@ public final class DefaultMediaSourceFactory implements MediaSourceFactory {
           String label = subtitleConfigurations.get(i).label;
           if (label != null) {
             labels.add(new Label(null, null, label));
-          } else {
-            labels = null;
           }
 
           Format format =
@@ -529,6 +527,7 @@ public final class DefaultMediaSourceFactory implements MediaSourceFactory {
                   .setLanguage(subtitleConfigurations.get(i).language)
                   .setSelectionFlags(subtitleConfigurations.get(i).selectionFlags)
                   .setRoleFlags(subtitleConfigurations.get(i).roleFlags)
+                  .setLabel(label)
                   .setLabels(labels)
                   .setId(subtitleConfigurations.get(i).id)
                   .build();

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/source/SingleSampleMediaSource.java

@@ -177,8 +177,6 @@ public final class SingleSampleMediaSource extends BaseMediaSource {
     String label = subtitleConfiguration.label;
     if (label != null) {
       labels.add(new Label(null, null, label));
-    } else {
-      labels = null;
     }
     this.format =
         new Format.Builder()
@@ -186,6 +184,7 @@ public final class SingleSampleMediaSource extends BaseMediaSource {
             .setLanguage(subtitleConfiguration.language)
             .setSelectionFlags(subtitleConfiguration.selectionFlags)
             .setRoleFlags(subtitleConfiguration.roleFlags)
+            .setLabel(label)
             .setLabels(labels)
             .setId(subtitleConfiguration.id != null ? subtitleConfiguration.id : trackId)
             .build();

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/source/mediaparser/OutputConsumerAdapterV30.java

@@ -517,6 +517,7 @@ public final class OutputConsumerAdapterV30 implements MediaParser.OutputConsume
             .setLanguage(muxedCaptionFormat.language)
             .setRoleFlags(muxedCaptionFormat.roleFlags)
             .setSelectionFlags(muxedCaptionFormat.selectionFlags)
+            .setLabel(muxedCaptionFormat.label)
             .setLabels(muxedCaptionFormat.labels)
             .setMetadata(muxedCaptionFormat.metadata);
         break;

libraries/exoplayer/src/test/java/androidx/media3/exoplayer/source/SampleQueueTest.java

@@ -2058,7 +2058,7 @@ public final class SampleQueueTest {
   }
 
   private static Format copyWithLabel(Format format, String label) {
-    return format.buildUpon().setLabels(label).build();
+    return format.buildUpon().setLabel(label).build();
   }
 
   private static final class MockDrmSessionManager implements DrmSessionManager {

libraries/exoplayer_dash/src/main/java/androidx/media3/exoplayer/dash/manifest/DashManifestParser.java

@@ -405,7 +405,7 @@ public class DashManifestParser extends DefaultHandler
     int audioChannels = Format.NO_VALUE;
     int audioSamplingRate = parseInt(xpp, "audioSamplingRate", Format.NO_VALUE);
     String language = xpp.getAttributeValue(null, "lang");
-    String adaptationSetLabel = xpp.getAttributeValue(null, "label");
+    String label = xpp.getAttributeValue(null, "label");
     List<Label> labels = new ArrayList<>();
     String drmSchemeType = null;
     ArrayList<SchemeData> drmSchemeDatas = new ArrayList<>();
@@ -506,23 +506,22 @@ public class DashManifestParser extends DefaultHandler
       } else if (XmlPullParserUtil.isStartTag(xpp, "InbandEventStream")) {
         inbandEventStreams.add(parseDescriptor(xpp, "InbandEventStream"));
       } else if (XmlPullParserUtil.isStartTag(xpp, "Label")) {
-        labels.add(parseLabel(xpp));
+        Label parsedLabel = parseLabel(xpp);
+        label = parsedLabel.value;
+        labels.add(parsedLabel);
       } else if (XmlPullParserUtil.isStartTag(xpp)) {
         parseAdaptationSetChild(xpp);
       }
     } while (!XmlPullParserUtil.isEndTag(xpp, "AdaptationSet"));
 
-    if (labels.size() == 0 && adaptationSetLabel != null) {
-      labels.add(new Label(null, null, adaptationSetLabel));
-    }
-
     // Build the representations.
     List<Representation> representations = new ArrayList<>(representationInfos.size());
     for (int i = 0; i < representationInfos.size(); i++) {
       representations.add(
           buildRepresentation(
               representationInfos.get(i),
-              labels.isEmpty() ? null : labels,
+              label,
+              labels,
               drmSchemeType,
               drmSchemeDatas,
               inbandEventStreams));
@@ -861,11 +860,15 @@ public class DashManifestParser extends DefaultHandler
 
   protected Representation buildRepresentation(
       RepresentationInfo representationInfo,
+      @Nullable String label,
       @Nullable List<Label> labels,
       @Nullable String extraDrmSchemeType,
       ArrayList<SchemeData> extraDrmSchemeDatas,
       ArrayList<Descriptor> extraInbandEventStreams) {
     Format.Builder formatBuilder = representationInfo.format.buildUpon();
+    if (label != null) {
+      formatBuilder.setLabel(label);
+    }
     formatBuilder.setLabels(labels);
     @Nullable String drmSchemeType = representationInfo.drmSchemeType;
     if (drmSchemeType == null) {

libraries/exoplayer_dash/src/test/java/androidx/media3/exoplayer/dash/manifest/DashManifestParserTest.java

@@ -279,8 +279,9 @@ public class DashManifestParserTest {
 
     List<AdaptationSet> adaptationSets = manifest.getPeriod(0).adaptationSets;
 
-    assertThat(adaptationSets.get(0).representations.get(0).format.labels.get(0).value)
+    assertThat(adaptationSets.get(0).representations.get(0).format.label).isEqualTo("audio label");
-        .isEqualTo("audio label");
+    assertThat(adaptationSets.get(1).representations.get(0).format.label).isEqualTo("video label");
+    assertThat(adaptationSets.get(0).representations.get(0).format.labels.size()).isEqualTo(0);
     assertThat(adaptationSets.get(1).representations.get(0).format.labels.get(0).value)
         .isEqualTo("video label");
   }

libraries/exoplayer_hls/src/main/java/androidx/media3/exoplayer/hls/HlsMediaPeriod.java

@@ -852,6 +852,7 @@ import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
     @Nullable String sampleMimeType = MimeTypes.getMediaMimeType(codecs);
     return new Format.Builder()
         .setId(variantFormat.id)
+        .setLabel(variantFormat.label)
         .setLabels(variantFormat.labels)
         .setContainerMimeType(variantFormat.containerMimeType)
         .setSampleMimeType(sampleMimeType)
@@ -875,6 +876,7 @@ import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
     int selectionFlags = 0;
     int roleFlags = 0;
     @Nullable String language = null;
+    @Nullable String label = null;
     @Nullable List<Label> labels = null;
     if (mediaTagFormat != null) {
       codecs = mediaTagFormat.codecs;
@@ -883,6 +885,7 @@ import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
       selectionFlags = mediaTagFormat.selectionFlags;
       roleFlags = mediaTagFormat.roleFlags;
       language = mediaTagFormat.language;
+      label = mediaTagFormat.label;
       labels = mediaTagFormat.labels;
     } else {
       codecs = Util.getCodecsOfType(variantFormat.codecs, C.TRACK_TYPE_AUDIO);
@@ -892,6 +895,7 @@ import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
         selectionFlags = variantFormat.selectionFlags;
         roleFlags = variantFormat.roleFlags;
         language = variantFormat.language;
+        label = variantFormat.label;
         labels = variantFormat.labels;
       }
     }
@@ -900,6 +904,7 @@ import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
     int peakBitrate = isPrimaryTrackInVariant ? variantFormat.peakBitrate : Format.NO_VALUE;
     return new Format.Builder()
         .setId(variantFormat.id)
+        .setLabel(label)
         .setLabels(labels)
         .setContainerMimeType(variantFormat.containerMimeType)
         .setSampleMimeType(sampleMimeType)

libraries/exoplayer_hls/src/main/java/androidx/media3/exoplayer/hls/HlsSampleStreamWrapper.java

@@ -1583,6 +1583,7 @@ import org.checkerframework.checker.nullness.qual.RequiresNonNull;
         sampleFormat
             .buildUpon()
             .setId(playlistFormat.id)
+            .setLabel(playlistFormat.label)
             .setLabels(playlistFormat.labels)
             .setLanguage(playlistFormat.language)
             .setSelectionFlags(playlistFormat.selectionFlags)

libraries/exoplayer_hls/src/main/java/androidx/media3/exoplayer/hls/playlist/HlsPlaylistParser.java

@@ -477,6 +477,7 @@ public final class HlsPlaylistParser implements ParsingLoadable.Parser<HlsPlayli
       Format.Builder formatBuilder =
           new Format.Builder()
               .setId(groupId + ":" + name)
+              .setLabel(name)
               .setLabels(labels)
               .setContainerMimeType(MimeTypes.APPLICATION_M3U8)
               .setSelectionFlags(parseSelectionFlags(line))

libraries/exoplayer_smoothstreaming/src/main/java/androidx/media3/exoplayer/smoothstreaming/manifest/SsManifestParser.java

@@ -745,12 +745,11 @@ public class SsManifestParser implements ParsingLoadable.Parser<SsManifest> {
       String label = (String) getNormalizedAttribute(KEY_NAME);
       if (label != null) {
         labels.add(new Label(null, null, label));
-      } else {
-        labels = null;
       }
       format =
           formatBuilder
               .setId(parser.getAttributeValue(null, KEY_INDEX))
+              .setLabel(label)
               .setLabels(labels)
               .setSampleMimeType(sampleMimeType)
               .setAverageBitrate(parseRequiredInt(parser, KEY_BITRATE))

libraries/exoplayer_smoothstreaming/src/test/java/androidx/media3/exoplayer/smoothstreaming/manifest/SsManifestParserTest.java

@@ -51,6 +51,7 @@ public final class SsManifestParserTest {
             Uri.parse("https://example.com/test.ismc"),
             TestUtil.getInputStream(ApplicationProvider.getApplicationContext(), SAMPLE_ISMC_1));
 
-    assertThat(ssManifest.streamElements[0].formats[0].labels).isEqualTo("video");
+    assertThat(ssManifest.streamElements[0].formats[0].label).isEqualTo("video");
+    assertThat(ssManifest.streamElements[0].formats[0].labels.get(0).value).isEqualTo("video");
   }
 }

libraries/extractor/src/main/java/androidx/media3/extractor/avi/AviExtractor.java

@@ -516,8 +516,11 @@ public final class AviExtractor implements Extractor {
     }
     StreamNameChunk streamName = streamList.getChild(StreamNameChunk.class);
     if (streamName != null) {
+      String label = streamName.name;
+      builder.setLabel(label);
+
       List<Label> labels = new ArrayList<>();
-      labels.add(new Label(null, null, streamName.name));
+      labels.add(new Label(null, null, label));
       builder.setLabels(labels);
     }
     int trackType = MimeTypes.getTrackType(streamFormat.sampleMimeType);

libraries/extractor/src/main/java/androidx/media3/extractor/mkv/MatroskaExtractor.java

@@ -2424,6 +2424,8 @@ public class MatroskaExtractor implements Extractor {
       }
 
       if (name != null && !TRACK_NAME_TO_ROTATION_DEGREES.containsKey(name)) {
+        formatBuilder.setLabel(name);
+
         List<Label> labels = new ArrayList<>();
         labels.add(new Label(null, null, name));
         formatBuilder.setLabels(labels);

libraries/test_data/src/test/assets/extractordumps/mkv/sample_with_null_terminated_srt.mkv.0.dump

@@ -275,6 +275,8 @@ track 3:
     selectionFlags = [default]
     language = en
     label = Subs Label
+    labels:
+      value = Subs Label
   sample 0:
     time = 0
     flags = 1

libraries/test_data/src/test/assets/extractordumps/mkv/sample_with_null_terminated_srt.mkv.1.dump

@@ -275,6 +275,8 @@ track 3:
     selectionFlags = [default]
     language = en
     label = Subs Label
+    labels:
+      value = Subs Label
   sample 0:
     time = 0
     flags = 1

libraries/test_data/src/test/assets/extractordumps/mkv/sample_with_null_terminated_srt.mkv.2.dump

@@ -275,6 +275,8 @@ track 3:
     selectionFlags = [default]
     language = en
     label = Subs Label
+    labels:
+      value = Subs Label
   sample 0:
     time = 0
     flags = 1

libraries/test_data/src/test/assets/extractordumps/mkv/sample_with_null_terminated_srt.mkv.3.dump

@@ -275,6 +275,8 @@ track 3:
     selectionFlags = [default]
     language = en
     label = Subs Label
+    labels:
+      value = Subs Label
   sample 0:
     time = 0
     flags = 1

libraries/test_data/src/test/assets/extractordumps/mkv/sample_with_null_terminated_srt.mkv.unknown_length.dump

@@ -275,6 +275,8 @@ track 3:
     selectionFlags = [default]
     language = en
     label = Subs Label
+    labels:
+      value = Subs Label
   sample 0:
     time = 0
     flags = 1

libraries/test_data/src/test/assets/extractordumps/mkv/sample_with_srt.mkv.0.dump

@@ -275,6 +275,8 @@ track 3:
     selectionFlags = [default]
     language = en
     label = Subs Label
+    labels:
+      value = Subs Label
   sample 0:
     time = 0
     flags = 1

libraries/test_data/src/test/assets/extractordumps/mkv/sample_with_srt.mkv.1.dump

@@ -275,6 +275,8 @@ track 3:
     selectionFlags = [default]
     language = en
     label = Subs Label
+    labels:
+      value = Subs Label
   sample 0:
     time = 0
     flags = 1

libraries/test_data/src/test/assets/extractordumps/mkv/sample_with_srt.mkv.2.dump

@@ -275,6 +275,8 @@ track 3:
     selectionFlags = [default]
     language = en
     label = Subs Label
+    labels:
+      value = Subs Label
   sample 0:
     time = 0
     flags = 1

libraries/test_data/src/test/assets/extractordumps/mkv/sample_with_srt.mkv.3.dump

@@ -275,6 +275,8 @@ track 3:
     selectionFlags = [default]
     language = en
     label = Subs Label
+    labels:
+      value = Subs Label
   sample 0:
     time = 0
     flags = 1

libraries/test_data/src/test/assets/extractordumps/mkv/sample_with_srt.mkv.unknown_length.dump

@@ -275,6 +275,8 @@ track 3:
     selectionFlags = [default]
     language = en
     label = Subs Label
+    labels:
+      value = Subs Label
   sample 0:
     time = 0
     flags = 1

libraries/test_data/src/test/assets/extractordumps/mkv_subtitle_transcoding/sample_with_null_terminated_srt.mkv.0.dump

@@ -276,6 +276,8 @@ track 3:
     selectionFlags = [default]
     language = en
     label = Subs Label
+    labels:
+      value = Subs Label
   sample 0:
     time = 0
     flags = 1

libraries/test_data/src/test/assets/extractordumps/mkv_subtitle_transcoding/sample_with_null_terminated_srt.mkv.1.dump

@@ -276,6 +276,8 @@ track 3:
     selectionFlags = [default]
     language = en
     label = Subs Label
+    labels:
+      value = Subs Label
   sample 0:
     time = 0
     flags = 1

libraries/test_data/src/test/assets/extractordumps/mkv_subtitle_transcoding/sample_with_null_terminated_srt.mkv.2.dump

@@ -276,6 +276,8 @@ track 3:
     selectionFlags = [default]
     language = en
     label = Subs Label
+    labels:
+      value = Subs Label
   sample 0:
     time = 0
     flags = 1

libraries/test_data/src/test/assets/extractordumps/mkv_subtitle_transcoding/sample_with_null_terminated_srt.mkv.3.dump

@@ -276,6 +276,8 @@ track 3:
     selectionFlags = [default]
     language = en
     label = Subs Label
+    labels:
+      value = Subs Label
   sample 0:
     time = 0
     flags = 1

libraries/test_data/src/test/assets/extractordumps/mkv_subtitle_transcoding/sample_with_null_terminated_srt.mkv.unknown_length.dump

@@ -276,6 +276,8 @@ track 3:
     selectionFlags = [default]
     language = en
     label = Subs Label
+    labels:
+      value = Subs Label
   sample 0:
     time = 0
     flags = 1

libraries/test_data/src/test/assets/extractordumps/mkv_subtitle_transcoding/sample_with_srt.mkv.0.dump

@@ -276,6 +276,8 @@ track 3:
     selectionFlags = [default]
     language = en
     label = Subs Label
+    labels:
+      value = Subs Label
   sample 0:
     time = 0
     flags = 1

libraries/test_data/src/test/assets/extractordumps/mkv_subtitle_transcoding/sample_with_srt.mkv.1.dump

@@ -276,6 +276,8 @@ track 3:
     selectionFlags = [default]
     language = en
     label = Subs Label
+    labels:
+      value = Subs Label
   sample 0:
     time = 0
     flags = 1

libraries/test_data/src/test/assets/extractordumps/mkv_subtitle_transcoding/sample_with_srt.mkv.2.dump

@@ -276,6 +276,8 @@ track 3:
     selectionFlags = [default]
     language = en
     label = Subs Label
+    labels:
+      value = Subs Label
   sample 0:
     time = 0
     flags = 1

libraries/test_data/src/test/assets/extractordumps/mkv_subtitle_transcoding/sample_with_srt.mkv.3.dump

@@ -276,6 +276,8 @@ track 3:
     selectionFlags = [default]
     language = en
     label = Subs Label
+    labels:
+      value = Subs Label
   sample 0:
     time = 0
     flags = 1

libraries/test_data/src/test/assets/extractordumps/mkv_subtitle_transcoding/sample_with_srt.mkv.unknown_length.dump

@@ -276,6 +276,8 @@ track 3:
     selectionFlags = [default]
     language = en
     label = Subs Label
+    labels:
+      value = Subs Label
   sample 0:
     time = 0
     flags = 1

libraries/test_utils/src/main/java/androidx/media3/test/utils/DumpableFormat.java

@@ -100,7 +100,22 @@ public final class DumpableFormat implements Dumper.Dumpable {
         DEFAULT_FORMAT,
         format -> Util.getRoleFlagStrings(format.roleFlags));
     addIfNonDefault(dumper, "language", format, DEFAULT_FORMAT, format -> format.language);
-    addIfNonDefault(dumper, "label", format, DEFAULT_FORMAT, format -> format.labels);
+    addIfNonDefault(dumper, "label", format, DEFAULT_FORMAT, format -> format.label);
+    if (!format.labels.isEmpty()) {
+      dumper.startBlock("labels");
+      for (int i = 0; i < format.labels.size(); i++) {
+        String id = format.labels.get(i).id;
+        String lang = format.labels.get(i).lang;
+        if (id != null) {
+          dumper.add("id", id);
+        }
+        if (lang != null) {
+          dumper.add("lang", lang);
+        }
+        dumper.add("value", format.labels.get(i).value);
+      }
+      dumper.endBlock();
+    }
     if (format.drmInitData != null) {
       dumper.add("drmInitData", format.drmInitData.hashCode());
     }

libraries/ui/src/main/java/androidx/media3/ui/DefaultTrackNameProvider.java

@@ -110,8 +110,8 @@ public class DefaultTrackNameProvider implements TrackNameProvider {
   }
 
   private String buildLabelString(Format format) {
-    if (format.labels == null || format.labels.isEmpty()) {
+    if (format.labels.isEmpty()) {
-      return "";
+      return TextUtils.isEmpty(format.label) ? "" : format.label;
     }
     if (!TextUtils.isEmpty(format.language)) {
       List<Label> labelsByLanguage =