Add default constructor for InAppMuxer.Factory

PiperOrigin-RevId: 532838813
(cherry picked from commit bd95fcd98d87c3ba6ada053a6f2ca1468accf4a4)

library/transformer/src/androidTest/java/com/google/android/exoplayer2/transformer/TransformerWithInAppMuxerEndToEndTest.java

@@ -53,10 +53,7 @@ public class TransformerWithInAppMuxerEndToEndTest {
   public void videoEditing_completesSuccessfully() throws Exception {
     String testId = "videoEditing_completesSuccessfully";
     Transformer transformer =
-        new Transformer.Builder(context)
-            .setMuxerFactory(
-                new InAppMuxer.Factory(DefaultMuxer.Factory.DEFAULT_MAX_DELAY_BETWEEN_SAMPLES_MS))
-            .build();
+        new Transformer.Builder(context).setMuxerFactory(new InAppMuxer.Factory()).build();
     ImmutableList<Effect> videoEffects = ImmutableList.of(RgbFilter.createGrayscaleFilter());
     MediaItem mediaItem = MediaItem.fromUri(Uri.parse(MP4_FILE_ASSET_DIRECTORY + inputFile));
     EditedMediaItem editedMediaItem =
@@ -76,10 +73,7 @@ public class TransformerWithInAppMuxerEndToEndTest {
   public void audioEditing_completesSuccessfully() throws Exception {
     String testId = "audioEditing_completesSuccessfully";
     Transformer transformer =
-        new Transformer.Builder(context)
-            .setMuxerFactory(
-                new InAppMuxer.Factory(DefaultMuxer.Factory.DEFAULT_MAX_DELAY_BETWEEN_SAMPLES_MS))
-            .build();
+        new Transformer.Builder(context).setMuxerFactory(new InAppMuxer.Factory()).build();
     ChannelMixingAudioProcessor channelMixingAudioProcessor = new ChannelMixingAudioProcessor();
     channelMixingAudioProcessor.putChannelMixingMatrix(
         ChannelMixingMatrix.create(/* inputChannelCount= */ 1, /* outputChannelCount= */ 2));

library/transformer/src/androidTest/java/com/google/android/exoplayer2/transformer/mh/TransformerWithInAppMuxerEndToEndTest.java

@@ -26,7 +26,6 @@ import androidx.test.ext.junit.runners.AndroidJUnit4;
 import com.google.android.exoplayer2.MediaItem;
 import com.google.android.exoplayer2.effect.RgbFilter;
 import com.google.android.exoplayer2.transformer.AndroidTestUtil;
-import com.google.android.exoplayer2.transformer.DefaultMuxer;
 import com.google.android.exoplayer2.transformer.EditedMediaItem;
 import com.google.android.exoplayer2.transformer.Effects;
 import com.google.android.exoplayer2.transformer.ExportTestResult;
@@ -50,10 +49,7 @@ public class TransformerWithInAppMuxerEndToEndTest {
       return;
     }
     Transformer transformer =
-        new Transformer.Builder(context)
-            .setMuxerFactory(
-                new InAppMuxer.Factory(DefaultMuxer.Factory.DEFAULT_MAX_DELAY_BETWEEN_SAMPLES_MS))
-            .build();
+        new Transformer.Builder(context).setMuxerFactory(new InAppMuxer.Factory()).build();
     ImmutableList<Effect> videoEffects = ImmutableList.of(RgbFilter.createGrayscaleFilter());
     MediaItem mediaItem = MediaItem.fromUri(Uri.parse(MP4_ASSET_AV1_VIDEO_URI_STRING));
     EditedMediaItem editedMediaItem =

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

@@ -40,6 +40,16 @@ public final class InAppMuxer implements Muxer {
   public static final class Factory implements Muxer.Factory {
     private final long maxDelayBetweenSamplesMs;
 
+    /**
+     * Creates an instance with {@link Muxer#getMaxDelayBetweenSamplesMs() maxDelayBetweenSamplesMs}
+     * set to {@link DefaultMuxer.Factory#DEFAULT_MAX_DELAY_BETWEEN_SAMPLES_MS}.
+     */
+    public Factory() {
+      this(
+          /* maxDelayBetweenSamplesMs= */ DefaultMuxer.Factory
+              .DEFAULT_MAX_DELAY_BETWEEN_SAMPLES_MS);
+    }
+
     /** {@link Muxer.Factory} for {@link InAppMuxer}. */
     public Factory(long maxDelayBetweenSamplesMs) {
       this.maxDelayBetweenSamplesMs = maxDelayBetweenSamplesMs;