Avoid potential ArrayStoreException with audio processors

The app is able to pass a more specialized array type, so the Arrays.copyOf call
produces an array into which it's not valid to store arbitrary AudioProcessors.

Create a new array and copy into it to avoid this problem.

PiperOrigin-RevId: 264779164

library/core/src/main/java/com/google/android/exoplayer2/audio/DefaultAudioSink.java

@@ -37,7 +37,6 @@ import java.nio.ByteBuffer;
 import java.nio.ByteOrder;
 import java.util.ArrayDeque;
 import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.Collections;
 
 /**
@@ -122,7 +121,15 @@ public final class DefaultAudioSink implements AudioSink {
      * audioProcessors} applied before silence skipping and playback parameters.
      */
     public DefaultAudioProcessorChain(AudioProcessor... audioProcessors) {
-      this.audioProcessors = Arrays.copyOf(audioProcessors, audioProcessors.length + 2);
+      // The passed-in type may be more specialized than AudioProcessor[], so allocate a new array
+      // rather than using Arrays.copyOf.
+      this.audioProcessors = new AudioProcessor[audioProcessors.length + 2];
+      System.arraycopy(
+          /* src= */ audioProcessors,
+          /* srcPos= */ 0,
+          /* dest= */ this.audioProcessors,
+          /* destPos= */ 0,
+          /* length= */ audioProcessors.length);
       silenceSkippingAudioProcessor = new SilenceSkippingAudioProcessor();
       sonicAudioProcessor = new SonicAudioProcessor();
       this.audioProcessors[audioProcessors.length] = silenceSkippingAudioProcessor;

library/core/src/test/java/com/google/android/exoplayer2/audio/DefaultAudioSinkTest.java

@@ -67,6 +67,13 @@ public final class DefaultAudioSinkTest {
             /* enableConvertHighResIntPcmToFloat= */ false);
   }
 
+  @Test
+  public void handlesSpecializedAudioProcessorArray() {
+    defaultAudioSink =
+        new DefaultAudioSink(
+            AudioCapabilities.DEFAULT_AUDIO_CAPABILITIES, new TeeAudioProcessor[0]);
+  }
+
   @Test
   public void handlesBufferAfterReset() throws Exception {
     configureDefaultAudioSink(CHANNEL_COUNT_STEREO);