From 15650c6bf3a29104fc9d5a9033f61d9dd022bbf7 Mon Sep 17 00:00:00 2001
From: sheenachhabra <sheenachhabra@google.com>
Date: Fri, 18 Aug 2023 14:18:58 +0100
Subject: [PATCH] Add buildUpon method in Composition

We will need to build upon original composition
for pause and resume feature and will have to set modified sequences.
In the next CL, will add method to set sequences on builder and will
probably remove it from the constructor parameter (to avoid providing
two APIs for same thing).

PiperOrigin-RevId: 558127334
---
 .../androidx/media3/transformer/Composition.java  | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/libraries/transformer/src/main/java/androidx/media3/transformer/Composition.java b/libraries/transformer/src/main/java/androidx/media3/transformer/Composition.java
index 4225324186..9588bb451d 100644
--- a/libraries/transformer/src/main/java/androidx/media3/transformer/Composition.java
+++ b/libraries/transformer/src/main/java/androidx/media3/transformer/Composition.java
@@ -50,6 +50,16 @@ public final class Composition {
     private boolean transmuxVideo;
     private @HdrMode int hdrMode;
 
+    /** Creates a new instance to build upon the provided {@link Composition}. */
+    private Builder(Composition composition) {
+      sequences = composition.sequences;
+      effects = composition.effects;
+      forceAudioTrack = composition.forceAudioTrack;
+      transmuxAudio = composition.transmuxAudio;
+      transmuxVideo = composition.transmuxVideo;
+      hdrMode = composition.hdrMode;
+    }
+
     /**
      * Creates an instance.
      *
@@ -306,6 +316,11 @@ public final class Composition {
    */
   public final @HdrMode int hdrMode;
 
+  /** Returns a {@link Composition.Builder} initialized with the values of this instance. */
+  public Builder buildUpon() {
+    return new Builder(this);
+  }
+
   private Composition(
       List<EditedMediaItemSequence> sequences,
       Effects effects,