Derive test output video name from the TAG.

We need the filename of the output videos to be predictable, because
MobileHarness requires the exact filename to pull the file.

PiperOrigin-RevId: 412092347

libraries/transformer/src/androidTest/java/androidx/media3/transformer/AndroidTestUtil.java

@@ -50,6 +50,7 @@ import org.checkerframework.checker.nullness.compatqual.NullableType;
    * Transforms the {@code uriString} with the {@link Transformer}.
    *
    * @param context The {@link Context}.
+   * @param testId An identifier for the test.
    * @param transformer The {@link Transformer} that performs the transformation.
    * @param uriString The uri (as a {@link String}) that will be transformed.
    * @param timeoutSeconds The transformer timeout. An assertion confirms this is not exceeded.
@@ -57,7 +58,7 @@ import org.checkerframework.checker.nullness.compatqual.NullableType;
    * @throws Exception The cause of the transformation not completing.
    */
   public static TransformationResult runTransformer(
-      Context context, Transformer transformer, String uriString, int timeoutSeconds)
+      Context context, String testId, Transformer transformer, String uriString, int timeoutSeconds)
       throws Exception {
     AtomicReference<@NullableType Exception> exceptionReference = new AtomicReference<>();
     CountDownLatch countDownLatch = new CountDownLatch(1);
@@ -81,7 +82,7 @@ import org.checkerframework.checker.nullness.compatqual.NullableType;
             .build();
 
     Uri uri = Uri.parse(uriString);
-    File externalCacheFile = createExternalCacheFile(uri, context);
+    File externalCacheFile = createExternalCacheFile(context, /* filePrefix= */ testId);
     try {
       InstrumentationRegistry.getInstrumentation()
           .runOnMainSync(
@@ -108,11 +109,12 @@ import org.checkerframework.checker.nullness.compatqual.NullableType;
     }
   }
 
-  private static File createExternalCacheFile(Uri uri, Context context) throws IOException {
-    File file = new File(context.getExternalCacheDir(), "transformer-" + uri.hashCode());
+  private static File createExternalCacheFile(Context context, String filePrefix)
+      throws IOException {
+    File file = new File(context.getExternalCacheDir(), filePrefix + "-output.mp4");
     Assertions.checkState(
-        !file.exists() || file.delete(), "Could not delete the previous transformer output file");
-    Assertions.checkState(file.createNewFile(), "Could not create the transformer output file");
+        !file.exists() || file.delete(), "Could not delete the previous transformer output file.");
+    Assertions.checkState(file.createNewFile(), "Could not create the transformer output file.");
     return file;
   }
 

libraries/transformer/src/androidTest/java/androidx/media3/transformer/RemoveAudioTransformationTest.java

@@ -31,6 +31,11 @@ public class RemoveAudioTransformationTest {
   public void removeAudioTransform() throws Exception {
     Context context = ApplicationProvider.getApplicationContext();
     Transformer transformer = new Transformer.Builder(context).setRemoveAudio(true).build();
-    runTransformer(context, transformer, MP4_ASSET_URI_STRING, /* timeoutSeconds= */ 120);
+    runTransformer(
+        context,
+        /* testId= */ "removeAudioTransform",
+        transformer,
+        MP4_ASSET_URI_STRING,
+        /* timeoutSeconds= */ 120);
   }
 }

libraries/transformer/src/androidTest/java/androidx/media3/transformer/RemoveVideoTransformationTest.java

@@ -31,6 +31,11 @@ public class RemoveVideoTransformationTest {
   public void removeVideoTransform() throws Exception {
     Context context = ApplicationProvider.getApplicationContext();
     Transformer transformer = new Transformer.Builder(context).setRemoveVideo(true).build();
-    runTransformer(context, transformer, MP4_ASSET_URI_STRING, /* timeoutSeconds= */ 120);
+    runTransformer(
+        context,
+        /* testId= */ "removeVideoTransform",
+        transformer,
+        MP4_ASSET_URI_STRING,
+        /* timeoutSeconds= */ 120);
   }
 }

libraries/transformer/src/androidTest/java/androidx/media3/transformer/RepeatedTranscodeTransformationTest.java

@@ -32,7 +32,6 @@ import org.junit.runner.RunWith;
 @RunWith(AndroidJUnit4.class)
 @Ignore("Internal - b/206917996")
 public final class RepeatedTranscodeTransformationTest {
-
   private static final int TRANSCODE_COUNT = 10;
 
   @Test
@@ -50,6 +49,7 @@ public final class RepeatedTranscodeTransformationTest {
       differentOutputSizesBytes.add(
           runTransformer(
                   context,
+                  /* testId= */ "repeatedTranscode_givesConsistentLengthOutput",
                   transformer,
                   AndroidTestUtil.REMOTE_MP4_10_SECONDS_URI_STRING,
                   /* timeoutSeconds= */ 120)
@@ -77,6 +77,7 @@ public final class RepeatedTranscodeTransformationTest {
       differentOutputSizesBytes.add(
           runTransformer(
                   context,
+                  /* testId= */ "repeatedTranscodeNoAudio_givesConsistentLengthOutput",
                   transformer,
                   AndroidTestUtil.REMOTE_MP4_10_SECONDS_URI_STRING,
                   /* timeoutSeconds= */ 120)
@@ -104,6 +105,7 @@ public final class RepeatedTranscodeTransformationTest {
       differentOutputSizesBytes.add(
           runTransformer(
                   context,
+                  /* testId= */ "repeatedTranscodeNoVideo_givesConsistentLengthOutput",
                   transcodingTransformer,
                   AndroidTestUtil.REMOTE_MP4_10_SECONDS_URI_STRING,
                   /* timeoutSeconds= */ 120)

libraries/transformer/src/androidTest/java/androidx/media3/transformer/SefTransformationTest.java

@@ -32,6 +32,11 @@ public class SefTransformationTest {
     Context context = ApplicationProvider.getApplicationContext();
     Transformer transformer =
         new Transformer.Builder(context).setFlattenForSlowMotion(true).build();
-    runTransformer(context, transformer, SEF_ASSET_URI_STRING, /* timeoutSeconds= */ 120);
+    runTransformer(
+        context,
+        /* testId = */ "sefTransform",
+        transformer,
+        SEF_ASSET_URI_STRING,
+        /* timeoutSeconds= */ 120);
   }
 }

libraries/transformer/src/androidTest/java/androidx/media3/transformer/TransformationTest.java

@@ -31,6 +31,11 @@ public class TransformationTest {
   public void transform() throws Exception {
     Context context = ApplicationProvider.getApplicationContext();
     Transformer transformer = new Transformer.Builder(context).build();
-    runTransformer(context, transformer, MP4_ASSET_URI_STRING, /* timeoutSeconds= */ 120);
+    runTransformer(
+        context,
+        /* testId= */ "transform",
+        transformer,
+        MP4_ASSET_URI_STRING,
+        /* timeoutSeconds= */ 120);
   }
 }