Use the supported codec name in DecodeOneFrameUtil.

Tested:
  Before: fusion2/7d7db2d1-1c3e-3df3-8507-73b929c6eac8 (Weekly triage)
  After: sponge2/4c078211-e08c-43fa-91d5-346fccc04bcd (custom run)
PiperOrigin-RevId: 511157461

testutils/src/main/java/com/google/android/exoplayer2/testutil/DecodeOneFrameUtil.java

@@ -169,14 +169,13 @@ public final class DecodeOneFrameUtil {
         }
         }
       }
       }
 
 
-      checkStateNotNull(mediaFormat);
-      if (!isSupportedByDecoder(mediaFormat)) {
+      @Nullable String decoderName = getSupportedDecoderName(checkStateNotNull(mediaFormat));
+      if (decoderName == null) {
         throw new UnsupportedOperationException(NO_DECODER_SUPPORT_ERROR_STRING);
         throw new UnsupportedOperationException(NO_DECODER_SUPPORT_ERROR_STRING);
       }
       }
-      // Queue the first video frame from the extractor.
-      String mimeType = checkNotNull(mediaFormat.getString(MediaFormat.KEY_MIME));
-      mediaCodec = MediaCodec.createDecoderByType(mimeType);
+      mediaCodec = MediaCodec.createByCodecName(decoderName);
 
 
+      // Queue the first video frame from the extractor.
       mediaCodec.configure(mediaFormat, surface, /* crypto= */ null, /* flags= */ 0);
       mediaCodec.configure(mediaFormat, surface, /* crypto= */ null, /* flags= */ 0);
       mediaCodec.start();
       mediaCodec.start();
       int inputBufferIndex = mediaCodec.dequeueInputBuffer(DEQUEUE_TIMEOUT_US);
       int inputBufferIndex = mediaCodec.dequeueInputBuffer(DEQUEUE_TIMEOUT_US);
@@ -222,12 +221,13 @@ public final class DecodeOneFrameUtil {
   }
   }
 
 
   /**
   /**
-   * Returns whether a decoder supports this {@link MediaFormat}.
+   * Returns the name of a decoder that supports this {@link MediaFormat}.
    *
    *
    * <p>Capability check is similar to
    * <p>Capability check is similar to
    * com.google.android.exoplayer2.transformer.EncoderUtil.java#findCodecForFormat().
    * com.google.android.exoplayer2.transformer.EncoderUtil.java#findCodecForFormat().
    */
    */
-  private static boolean isSupportedByDecoder(MediaFormat format) {
+  @Nullable
+  private static String getSupportedDecoderName(MediaFormat format) {
     if (Util.SDK_INT < 21) {
     if (Util.SDK_INT < 21) {
       throw new UnsupportedOperationException("Unable to detect decoder support under API 21.");
       throw new UnsupportedOperationException("Unable to detect decoder support under API 21.");
     }
     }
@@ -251,7 +251,7 @@ public final class DecodeOneFrameUtil {
     if (Util.SDK_INT == 21) {
     if (Util.SDK_INT == 21) {
       MediaFormatUtil.maybeSetInteger(format, MediaFormat.KEY_FRAME_RATE, round(frameRate));
       MediaFormatUtil.maybeSetInteger(format, MediaFormat.KEY_FRAME_RATE, round(frameRate));
     }
     }
-    return mediaCodecName != null;
+    return mediaCodecName;
   }
   }
 
 
   private DecodeOneFrameUtil() {}
   private DecodeOneFrameUtil() {}