Add resolution fallback for 25% of requested.

If a device only supports 1920x1080 as maximum resolution, then adding
the 25% case ensures 8k is reduced correctly.

PiperOrigin-RevId: 502588364

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

@@ -239,7 +239,7 @@ public final class EncoderUtil {
 
     float[] reductionFactors =
         new float[] {
-          0.95f, 0.9f, 0.85f, 0.8f, 0.75f, 0.7f, 2f / 3f, 0.6f, 0.55f, 0.5f, 0.4f, 1f / 3f
+          0.95f, 0.9f, 0.85f, 0.8f, 0.75f, 0.7f, 2f / 3f, 0.6f, 0.55f, 0.5f, 0.4f, 1f / 3f, 0.25f
         };
     for (float reductionFactor : reductionFactors) {
       newWidth = alignResolution(round(width * reductionFactor), widthAlignment);

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

@@ -150,6 +150,20 @@ public class EncoderUtilTest {
     assertThat(closestSupportedResolution.getHeight()).isEqualTo(1920);
   }
 
+  @Test
+  public void getSupportedResolution_findsOneQuarterOfTheOriginalSize() {
+    ImmutableList<MediaCodecInfo> supportedEncoders = EncoderUtil.getSupportedEncoders(MIME_TYPE);
+    MediaCodecInfo encoderInfo = supportedEncoders.get(0);
+
+    @Nullable
+    Size closestSupportedResolution =
+        EncoderUtil.getSupportedResolution(encoderInfo, MIME_TYPE, 7680, 4320);
+
+    assertThat(closestSupportedResolution).isNotNull();
+    assertThat(closestSupportedResolution.getWidth()).isEqualTo(1920);
+    assertThat(closestSupportedResolution.getHeight()).isEqualTo(1080);
+  }
+
   /**
    * @see EncoderUtil#getSupportedEncoderNamesForHdrEditing(String, ColorInfo)
    */