Added a test-only method to clear the clearDecoderInfosCache.

The cache, being static, is updated every time a new MimeType is encountered.
The static cache needs to be cleared between tests that register codecs through
ShadowMediaCodec, or the subsequent tests could possibly pick up a wrong codec.

PiperOrigin-RevId: 351576018

library/core/src/main/java/com/google/android/exoplayer2/mediacodec/MediaCodecUtil.java

@@ -24,6 +24,7 @@ import android.media.MediaCodecList;
 import android.text.TextUtils;
 import android.util.Pair;
 import androidx.annotation.CheckResult;
+import androidx.annotation.GuardedBy;
 import androidx.annotation.Nullable;
 import androidx.annotation.RequiresApi;
 import com.google.android.exoplayer2.C;
@@ -63,6 +64,7 @@ public final class MediaCodecUtil {
   private static final String TAG = "MediaCodecUtil";
   private static final Pattern PROFILE_PATTERN = Pattern.compile("^\\D?(\\d+)$");
 
+  @GuardedBy("MediaCodecUtil.class")
   private static final HashMap<CodecKey, List<MediaCodecInfo>> decoderInfosCache = new HashMap<>();
 
   // Codecs to constant mappings.
@@ -106,6 +108,15 @@ public final class MediaCodecUtil {
   }
 
   /**
+   * Clears the codec cache.
+   *
+   * <p>This method should only be called in tests.
+   */
+  public static synchronized void clearDecoderInfoCache() {
+    decoderInfosCache.clear();
+  }
+
+  /**
    * Returns information about a decoder that will only decrypt data, without decoding it.
    *
    * @return A {@link MediaCodecInfo} describing the decoder, or null if no suitable decoder exists.
@@ -134,7 +145,7 @@ public final class MediaCodecUtil {
     return decoderInfos.isEmpty() ? null : decoderInfos.get(0);
   }
 
-  /**
+  /*
    * Returns all {@link MediaCodecInfo}s for the given mime type, in the order given by {@link
    * MediaCodecList}.
    *

library/core/src/test/java/com/google/android/exoplayer2/e2etest/EndToEndGaplessTest.java

@@ -26,6 +26,7 @@ import com.google.android.exoplayer2.Format;
 import com.google.android.exoplayer2.MediaItem;
 import com.google.android.exoplayer2.Player;
 import com.google.android.exoplayer2.SimpleExoPlayer;
+import com.google.android.exoplayer2.mediacodec.MediaCodecUtil;
 import com.google.android.exoplayer2.robolectric.RandomizedMp3Decoder;
 import com.google.android.exoplayer2.robolectric.TestPlayerRunHelper;
 import com.google.android.exoplayer2.testutil.AutoAdvancingFakeClock;
@@ -34,6 +35,7 @@ import com.google.common.collect.ImmutableList;
 import com.google.common.primitives.Bytes;
 import java.io.ByteArrayOutputStream;
 import java.util.Arrays;
+import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
@@ -77,6 +79,13 @@ public class EndToEndGaplessTest {
             .build());
   }
 
+  @After
+  public void cleanUp() {
+    MediaCodecUtil.clearDecoderInfoCache();
+    ShadowMediaCodecList.reset();
+    ShadowMediaCodec.clearCodecs();
+  }
+
   @Test
   public void testPlayback_twoIdenticalMp3Files() throws Exception {
     SimpleExoPlayer player =

robolectricutils/src/main/java/com/google/android/exoplayer2/robolectric/ShadowMediaCodecConfig.java

@@ -17,6 +17,7 @@ package com.google.android.exoplayer2.robolectric;
 
 import android.media.MediaCodecInfo;
 import android.media.MediaFormat;
+import com.google.android.exoplayer2.mediacodec.MediaCodecUtil;
 import com.google.android.exoplayer2.util.MimeTypes;
 import com.google.common.collect.ImmutableList;
 import com.google.common.primitives.Ints;
@@ -81,6 +82,7 @@ public final class ShadowMediaCodecConfig extends ExternalResource {
 
   @Override
   protected void after() {
+    MediaCodecUtil.clearDecoderInfoCache();
     ShadowMediaCodecList.reset();
     ShadowMediaCodec.clearCodecs();
   }