Release SequenceAssetLoader when ended

Before, the SequenceAssetLoader was released at the end of the export.
Release resources earlier if possible.

PiperOrigin-RevId: 519952572

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

@@ -94,6 +94,7 @@ import java.util.concurrent.atomic.AtomicInteger;
   private boolean audioLoopingEnded;
   private boolean videoLoopingEnded;
   private int processedInputsSize;
+  private boolean released;
 
   private volatile long currentAssetDurationUs;
 
@@ -165,7 +166,10 @@ import java.util.concurrent.atomic.AtomicInteger;
 
   @Override
   public void release() {
-    currentAssetLoader.release();
+    if (!released) {
+      currentAssetLoader.release();
+      released = true;
+    }
   }
 
   /**
@@ -368,13 +372,15 @@ import java.util.concurrent.atomic.AtomicInteger;
       long globalTimestampUs = totalDurationUs + inputBuffer.timeUs - currentAssetStartTimeUs;
       if (isLooping && globalTimestampUs >= maxSequenceDurationUs) {
         if (isMaxSequenceDurationUsFinal && !audioLoopingEnded) {
-          nonEndedTracks.decrementAndGet();
           checkNotNull(inputBuffer.data).limit(0);
           inputBuffer.setFlags(C.BUFFER_FLAG_END_OF_STREAM);
           // We know that queueInputBuffer() will always return true for the underlying
           // SampleConsumer so there is no need to handle the case where the sample wasn't queued.
           checkState(sampleConsumer.queueInputBuffer());
           audioLoopingEnded = true;
+          if (nonEndedTracks.decrementAndGet() == 0) {
+            release();
+          }
         }
         return false;
       }
@@ -387,8 +393,13 @@ import java.util.concurrent.atomic.AtomicInteger;
           if (nonEndedTracks.get() == 0) {
             switchAssetLoader();
           }
-          return true;
+        } else {
+          checkState(sampleConsumer.queueInputBuffer());
+          if (nonEndedTracks.get() == 0) {
+            release();
+          }
         }
+        return true;
       }
 
       checkState(sampleConsumer.queueInputBuffer());
@@ -448,13 +459,17 @@ import java.util.concurrent.atomic.AtomicInteger;
 
     @Override
     public void signalEndOfVideoInput() {
-      nonEndedTracks.decrementAndGet();
       boolean videoEnded =
           isLooping ? videoLoopingEnded : currentMediaItemIndex == editedMediaItems.size() - 1;
       if (videoEnded) {
         sampleConsumer.signalEndOfVideoInput();
-      } else if (nonEndedTracks.get() == 0) {
-        switchAssetLoader();
+      }
+      if (nonEndedTracks.decrementAndGet() == 0) {
+        if (videoEnded) {
+          release();
+        } else {
+          switchAssetLoader();
+        }
       }
     }
 
@@ -479,5 +494,9 @@ import java.util.concurrent.atomic.AtomicInteger;
             currentAssetLoader.start();
           });
     }
+
+    private void release() {
+      handler.post(SequenceAssetLoader.this::release);
+    }
   }
 }