Add regression test forcing encode/decode.

PiperOrigin-RevId: 432928418

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

@@ -23,11 +23,15 @@ import static com.google.android.exoplayer2.transformer.AndroidTestUtil.MP4_REMO
 import android.content.Context;
 import androidx.test.core.app.ApplicationProvider;
 import androidx.test.ext.junit.runners.AndroidJUnit4;
+import com.google.android.exoplayer2.Format;
+import com.google.android.exoplayer2.transformer.Codec;
+import com.google.android.exoplayer2.transformer.TransformationException;
 import com.google.android.exoplayer2.transformer.TransformationRequest;
 import com.google.android.exoplayer2.transformer.Transformer;
 import com.google.android.exoplayer2.transformer.TransformerAndroidTestRunner;
 import com.google.android.exoplayer2.util.Log;
 import com.google.android.exoplayer2.util.Util;
+import java.util.List;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 
@@ -49,6 +53,46 @@ public class TransformationTest {
         .run(testId, MP4_ASSET_WITH_INCREASING_TIMESTAMPS_URI_STRING);
   }
 
+  @Test
+  public void transformWithDecodeEncode() throws Exception {
+    final String testId = TAG + "_transformForceCodecUse";
+
+    Context context = ApplicationProvider.getApplicationContext();
+    Transformer transformer =
+        new Transformer.Builder(context)
+            .setEncoderFactory(
+                new Codec.EncoderFactory() {
+                  @Override
+                  public Codec createForAudioEncoding(Format format, List<String> allowedMimeTypes)
+                      throws TransformationException {
+                    return Codec.EncoderFactory.DEFAULT.createForAudioEncoding(
+                        format, allowedMimeTypes);
+                  }
+
+                  @Override
+                  public Codec createForVideoEncoding(Format format, List<String> allowedMimeTypes)
+                      throws TransformationException {
+                    return Codec.EncoderFactory.DEFAULT.createForVideoEncoding(
+                        format, allowedMimeTypes);
+                  }
+
+                  @Override
+                  public boolean audioNeedsEncoding() {
+                    return true;
+                  }
+
+                  @Override
+                  public boolean videoNeedsEncoding() {
+                    return true;
+                  }
+                })
+            .build();
+    new TransformerAndroidTestRunner.Builder(context, transformer)
+        .setCalculateSsim(true)
+        .build()
+        .run(testId, MP4_ASSET_WITH_INCREASING_TIMESTAMPS_URI_STRING);
+  }
+
   @Test
   public void transform4K60() throws Exception {
     final String testId = TAG + "_transform4K60";

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

@@ -105,6 +105,11 @@ public interface Codec {
     Codec createForVideoEncoding(Format format, List<String> allowedMimeTypes)
         throws TransformationException;
 
+    /** Returns whether the audio needs to be encoded because of encoder specific configuration. */
+    default boolean audioNeedsEncoding() {
+      return false;
+    }
+
     /** Returns whether the video needs to be encoded because of encoder specific configuration. */
     default boolean videoNeedsEncoding() {
       return false;

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

@@ -85,6 +85,9 @@ import com.google.android.exoplayer2.source.SampleStream.ReadDataResult;
   }
 
   private boolean shouldPassthrough(Format inputFormat) {
+    if (encoderFactory.audioNeedsEncoding()) {
+      return false;
+    }
     if (transformationRequest.audioMimeType != null
         && !transformationRequest.audioMimeType.equals(inputFormat.sampleMimeType)) {
       return false;