Add EditedMediaItemSequence and Composition objects

PiperOrigin-RevId: 505047245

library/transformer/src/main/java/com/google/android/exoplayer2/transformer/Composition.java

+/*
+ * Copyright 2023 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 com.google.android.exoplayer2.transformer;
+
+import com.google.android.exoplayer2.MediaItem;
+import com.google.common.collect.ImmutableList;
+
+/**
+ * A composition of {@link MediaItem} instances, with transformations to apply to them.
+ *
+ * <p>The {@linkplain MediaItem} instances can be concatenated or mixed. {@link Effects} can be
+ * applied to individual {@linkplain MediaItem} instances, as well as to the composition.
+ */
+public final class Composition {
+
+  /* package */ final ImmutableList<EditedMediaItemSequence> sequences;
+  /* package */ final Effects effects;
+
+  /**
+   * Creates an instance.
+   *
+   * @param sequences The {@link EditedMediaItemSequence} instances to compose. {@link MediaItem}
+   *     instances from different sequences that are overlapping in time will be mixed in the
+   *     output.
+   * @param effects The {@link Effects} to apply to the composition.
+   */
+  public Composition(ImmutableList<EditedMediaItemSequence> sequences, Effects effects) {
+    this.sequences = sequences;
+    this.effects = effects;
+  }
+}

library/transformer/src/main/java/com/google/android/exoplayer2/transformer/EditedMediaItem.java

@@ -26,7 +26,7 @@ import com.google.errorprone.annotations.CanIgnoreReturnValue;
 import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
 import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
 
 
 /** A {@link MediaItem} with the transformations to apply to it. */
 /** A {@link MediaItem} with the transformations to apply to it. */
-public class EditedMediaItem {
+public final class EditedMediaItem {
 
 
   /** A builder for {@link EditedMediaItem} instances. */
   /** A builder for {@link EditedMediaItem} instances. */
   public static final class Builder {
   public static final class Builder {

library/transformer/src/main/java/com/google/android/exoplayer2/transformer/EditedMediaItemSequence.java

+/*
+ * Copyright 2023 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 com.google.android.exoplayer2.transformer;
+
+import com.google.common.collect.ImmutableList;
+
+/**
+ * A sequence of {@link EditedMediaItem} instances.
+ *
+ * <p>{@linkplain EditedMediaItem} instances in a sequence don't overlap in time.
+ */
+public final class EditedMediaItemSequence {
+
+  /* package */ final ImmutableList<EditedMediaItem> editedMediaItems;
+
+  /**
+   * Creates an instance.
+   *
+   * @param editedMediaItems The {@link EditedMediaItem} instances in the sequence.
+   */
+  public EditedMediaItemSequence(ImmutableList<EditedMediaItem> editedMediaItems) {
+    this.editedMediaItems = editedMediaItems;
+  }
+}