Convert PlaybackExceptions to TransformationExceptions.

Transformer uses ExoPlayer for reading input. Apps using Transformer
do not need to know this. So, PlaybackExceptions are converted to
TransformationExceptions with the same message, cause and error code.

The corresponding IO error codes are copied from PlaybackException.

PiperOrigin-RevId: 416793741

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

@@ -845,7 +845,7 @@ public final class Transformer {
       handleTransformationEnded(
       handleTransformationEnded(
           cause instanceof TransformationException
           cause instanceof TransformationException
               ? (TransformationException) cause
               ? (TransformationException) cause
-              : TransformationException.createForUnexpected(error));
+              : TransformationException.createForPlaybackException(error));
     }
     }
 
 
     private void handleTransformationEnded(@Nullable TransformationException exception) {
     private void handleTransformationEnded(@Nullable TransformationException exception) {

library/transformer/src/test/java/com/google/android/exoplayer2/transformer/TransformerTest.java

@@ -35,7 +35,6 @@ import android.view.Surface;
 import androidx.annotation.Nullable;
 import androidx.annotation.Nullable;
 import androidx.test.core.app.ApplicationProvider;
 import androidx.test.core.app.ApplicationProvider;
 import androidx.test.ext.junit.runners.AndroidJUnit4;
 import androidx.test.ext.junit.runners.AndroidJUnit4;
-import com.google.android.exoplayer2.ExoPlaybackException;
 import com.google.android.exoplayer2.MediaItem;
 import com.google.android.exoplayer2.MediaItem;
 import com.google.android.exoplayer2.testutil.DumpFileAsserts;
 import com.google.android.exoplayer2.testutil.DumpFileAsserts;
 import com.google.android.exoplayer2.testutil.FakeClock;
 import com.google.android.exoplayer2.testutil.FakeClock;
@@ -295,15 +294,14 @@ public final class TransformerTest {
   }
   }
 
 
   @Test
   @Test
-  public void startTransformation_withPlayerError_completesWithError() throws Exception {
+  public void startTransformation_withIoError_completesWithError() throws Exception {
     Transformer transformer = new Transformer.Builder(context).setClock(clock).build();
     Transformer transformer = new Transformer.Builder(context).setClock(clock).build();
     MediaItem mediaItem = MediaItem.fromUri("asset:///non-existing-path.mp4");
     MediaItem mediaItem = MediaItem.fromUri("asset:///non-existing-path.mp4");
 
 
     transformer.startTransformation(mediaItem, outputPath);
     transformer.startTransformation(mediaItem, outputPath);
     TransformationException exception = TransformerTestRunner.runUntilError(transformer);
     TransformationException exception = TransformerTestRunner.runUntilError(transformer);
 
 
-    assertThat(exception).hasCauseThat().isInstanceOf(ExoPlaybackException.class);
-    assertThat(exception).hasCauseThat().hasCauseThat().isInstanceOf(IOException.class);
+    assertThat(exception).hasCauseThat().isInstanceOf(IOException.class);
   }
   }
 
 
   @Test
   @Test