Add MediaItem.SubtitleConfiguration#id field

Issue: google/ExoPlayer#9673

#minor-release

PiperOrigin-RevId: 414413320

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

@@ -1268,6 +1268,7 @@ public final class MediaItem implements Bundleable {
       private @C.SelectionFlags int selectionFlags;
       private @C.RoleFlags int roleFlags;
       @Nullable private String label;
+      @Nullable private String id;
 
       /**
        * Constructs an instance.
@@ -1285,6 +1286,7 @@ public final class MediaItem implements Bundleable {
         this.selectionFlags = subtitleConfiguration.selectionFlags;
         this.roleFlags = subtitleConfiguration.roleFlags;
         this.label = subtitleConfiguration.label;
+        this.id = subtitleConfiguration.id;
       }
 
       /** Sets the {@link Uri} to the subtitle file. */
@@ -1323,6 +1325,12 @@ public final class MediaItem implements Bundleable {
         return this;
       }
 
+      /** Sets the optional ID for this subtitle track. */
+      public Builder setId(@Nullable String id) {
+        this.id = id;
+        return this;
+      }
+
       /** Creates a {@link SubtitleConfiguration} from the values of this builder. */
       public SubtitleConfiguration build() {
         return new SubtitleConfiguration(this);
@@ -1345,20 +1353,27 @@ public final class MediaItem implements Bundleable {
     public final @C.RoleFlags int roleFlags;
     /** The label. */
     @Nullable public final String label;
+    /**
+     * The ID of the subtitles. This will be propagated to the {@link Format#id} of the subtitle
+     * track created from this configuration.
+     */
+    @Nullable public final String id;
 
     private SubtitleConfiguration(
         Uri uri,
         String mimeType,
         @Nullable String language,
-        @C.SelectionFlags int selectionFlags,
-        @C.RoleFlags int roleFlags,
-        @Nullable String label) {
+        int selectionFlags,
+        int roleFlags,
+        @Nullable String label,
+        @Nullable String id) {
       this.uri = uri;
       this.mimeType = mimeType;
       this.language = language;
       this.selectionFlags = selectionFlags;
       this.roleFlags = roleFlags;
       this.label = label;
+      this.id = id;
     }
 
     private SubtitleConfiguration(Builder builder) {
@@ -1368,6 +1383,7 @@ public final class MediaItem implements Bundleable {
       this.selectionFlags = builder.selectionFlags;
       this.roleFlags = builder.roleFlags;
       this.label = builder.label;
+      this.id = builder.id;
     }
 
     /** Returns a {@link Builder} initialized with the values of this instance. */
@@ -1391,7 +1407,8 @@ public final class MediaItem implements Bundleable {
           && Util.areEqual(language, other.language)
           && selectionFlags == other.selectionFlags
           && roleFlags == other.roleFlags
-          && Util.areEqual(label, other.label);
+          && Util.areEqual(label, other.label)
+          && Util.areEqual(id, other.id);
     }
 
     @Override
@@ -1402,6 +1419,7 @@ public final class MediaItem implements Bundleable {
       result = 31 * result + selectionFlags;
       result = 31 * result + roleFlags;
       result = 31 * result + (label == null ? 0 : label.hashCode());
+      result = 31 * result + (id == null ? 0 : id.hashCode());
       return result;
     }
   }
@@ -1436,7 +1454,7 @@ public final class MediaItem implements Bundleable {
         @C.SelectionFlags int selectionFlags,
         @C.RoleFlags int roleFlags,
         @Nullable String label) {
-      super(uri, mimeType, language, selectionFlags, roleFlags, label);
+      super(uri, mimeType, language, selectionFlags, roleFlags, label, /* id= */ null);
     }
 
     private Subtitle(Builder builder) {

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

@@ -276,6 +276,7 @@ public class MediaItemTest {
                 .setSelectionFlags(C.SELECTION_FLAG_FORCED)
                 .setRoleFlags(C.ROLE_FLAG_ALTERNATE)
                 .setLabel("label")
+                .setId("id")
                 .build());
 
     MediaItem mediaItem =
@@ -617,6 +618,7 @@ public class MediaItemTest {
                         .setSelectionFlags(C.SELECTION_FLAG_FORCED)
                         .setRoleFlags(C.ROLE_FLAG_ALTERNATE)
                         .setLabel("label")
+                        .setId("id")
                         .build()))
             .setTag(new Object())
             .build();
@@ -673,6 +675,7 @@ public class MediaItemTest {
                         .setSelectionFlags(C.SELECTION_FLAG_FORCED)
                         .setRoleFlags(C.ROLE_FLAG_ALTERNATE)
                         .setLabel("label")
+                        .setId("id")
                         .build()))
             .setTag(new Object())
             .build();

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

@@ -406,6 +406,7 @@ public final class DefaultMediaSourceFactory implements MediaSourceFactory {
                   .setSelectionFlags(subtitleConfigurations.get(i).selectionFlags)
                   .setRoleFlags(subtitleConfigurations.get(i).roleFlags)
                   .setLabel(subtitleConfigurations.get(i).label)
+                  .setId(subtitleConfigurations.get(i).id)
                   .build();
           ExtractorsFactory extractorsFactory =
               () ->

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

@@ -172,6 +172,7 @@ public final class SingleSampleMediaSource extends BaseMediaSource {
             .setSelectionFlags(subtitleConfiguration.selectionFlags)
             .setRoleFlags(subtitleConfiguration.roleFlags)
             .setLabel(subtitleConfiguration.label)
+            .setId(subtitleConfiguration.id)
             .build();
     dataSpec =
         new DataSpec.Builder()