Async queueing: avoid extra memory allocations

When copying CryptoInfo for asynchronous input buffer queueing,
re-use the destination CryptoInfo's arrays to avoid re-allocating
memory.

PiperOrigin-RevId: 295706771

library/common/src/main/java/com/google/android/exoplayer2/decoder/CryptoInfo.java

@@ -15,11 +15,9 @@
  */
 package com.google.android.exoplayer2.decoder;
 
-import androidx.annotation.Nullable;
 import androidx.annotation.RequiresApi;
 import com.google.android.exoplayer2.C;
 import com.google.android.exoplayer2.util.Util;
-import java.util.Arrays;
 
 /**
  * Compatibility wrapper for {@link android.media.MediaCodec.CryptoInfo}.
@@ -121,25 +119,6 @@ public final class CryptoInfo {
     return frameworkCryptoInfo;
   }
 
-  /** Performs a deep copy to {@code cryptoInfo}. */
-  public void copyTo(android.media.MediaCodec.CryptoInfo cryptoInfo) {
-    // Update cryptoInfo fields directly because CryptoInfo.set performs an unnecessary
-    // object allocation on Android N.
-    cryptoInfo.numSubSamples = numSubSamples;
-    cryptoInfo.numBytesOfClearData = copyOrNull(numBytesOfClearData);
-    cryptoInfo.numBytesOfEncryptedData = copyOrNull(numBytesOfEncryptedData);
-    cryptoInfo.key = copyOrNull(key);
-    cryptoInfo.iv = copyOrNull(iv);
-    cryptoInfo.mode = mode;
-    if (Util.SDK_INT >= 24) {
-      android.media.MediaCodec.CryptoInfo.Pattern pattern = patternHolder.pattern;
-      android.media.MediaCodec.CryptoInfo.Pattern patternCopy =
-          new android.media.MediaCodec.CryptoInfo.Pattern(
-              pattern.getEncryptBlocks(), pattern.getSkipBlocks());
-      cryptoInfo.setPattern(patternCopy);
-    }
-  }
-
   /** @deprecated Use {@link #getFrameworkCryptoInfo()}. */
   @Deprecated
   public android.media.MediaCodec.CryptoInfo getFrameworkCryptoInfoV16() {
@@ -169,16 +148,6 @@ public final class CryptoInfo {
     numBytesOfClearData[0] += count;
   }
 
-  @Nullable
-  private static int[] copyOrNull(@Nullable int[] array) {
-    return array != null ? Arrays.copyOf(array, array.length) : null;
-  }
-
-  @Nullable
-  private static byte[] copyOrNull(@Nullable byte[] array) {
-    return array != null ? Arrays.copyOf(array, array.length) : null;
-  }
-
   @RequiresApi(24)
   private static final class PatternHolderV24 {
 

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

@@ -29,6 +29,7 @@ import com.google.android.exoplayer2.decoder.CryptoInfo;
 import com.google.android.exoplayer2.util.ConditionVariable;
 import com.google.android.exoplayer2.util.Util;
 import java.util.ArrayDeque;
+import java.util.Arrays;
 import java.util.concurrent.atomic.AtomicReference;
 import org.checkerframework.checker.nullness.compatqual.NullableType;
 import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
@@ -110,7 +111,7 @@ class AsynchronousMediaCodecBufferEnqueuer implements MediaCodecInputBufferEnque
     maybeThrowException();
     MessageParams messageParams = getMessageParams();
     messageParams.setQueueParams(index, offset, /* size= */ 0, presentationTimeUs, flags);
-    info.copyTo(messageParams.cryptoInfo);
+    copy(info, messageParams.cryptoInfo);
     Message message =
         Util.castNonNull(handler).obtainMessage(MSG_QUEUE_SECURE_INPUT_BUFFER, messageParams);
     message.sendToTarget();
@@ -271,4 +272,65 @@ class AsynchronousMediaCodecBufferEnqueuer implements MediaCodecInputBufferEnque
     }
     return labelBuilder.toString();
   }
+
+  /** Performs a deep copy of {@code cryptoInfo} to {@code frameworkCryptoInfo}. */
+  private static void copy(
+      CryptoInfo cryptoInfo, android.media.MediaCodec.CryptoInfo frameworkCryptoInfo) {
+    // Update frameworkCryptoInfo fields directly because CryptoInfo.set performs an unnecessary
+    // object allocation on Android N.
+    frameworkCryptoInfo.numSubSamples = cryptoInfo.numSubSamples;
+    frameworkCryptoInfo.numBytesOfClearData =
+        copy(cryptoInfo.numBytesOfClearData, frameworkCryptoInfo.numBytesOfClearData);
+    frameworkCryptoInfo.numBytesOfEncryptedData =
+        copy(cryptoInfo.numBytesOfEncryptedData, frameworkCryptoInfo.numBytesOfEncryptedData);
+    frameworkCryptoInfo.key = copy(cryptoInfo.key, frameworkCryptoInfo.key);
+    frameworkCryptoInfo.iv = copy(cryptoInfo.iv, frameworkCryptoInfo.iv);
+    frameworkCryptoInfo.mode = cryptoInfo.mode;
+    if (Util.SDK_INT >= 24) {
+      android.media.MediaCodec.CryptoInfo.Pattern pattern =
+          new android.media.MediaCodec.CryptoInfo.Pattern(
+              cryptoInfo.encryptedBlocks, cryptoInfo.clearBlocks);
+      frameworkCryptoInfo.setPattern(pattern);
+    }
+  }
+
+  /**
+   * Copies {@code src}, reusing {@code dst} if it's at least as long as {@code src}.
+   *
+   * @param src The source array.
+   * @param dst The destination array, which will be reused if it's at least as long as {@code src}.
+   * @return The copy, which may be {@code dst} if it was reused.
+   */
+  private static int[] copy(int[] src, int[] dst) {
+    if (src == null) {
+      return dst;
+    }
+
+    if (dst == null || dst.length < src.length) {
+      return Arrays.copyOf(src, src.length);
+    } else {
+      System.arraycopy(src, 0, dst, 0, src.length);
+      return dst;
+    }
+  }
+
+  /**
+   * Copies {@code src}, reusing {@code dst} if it's at least as long as {@code src}.
+   *
+   * @param src The source array.
+   * @param dst The destination array, which will be reused if it's at least as long as {@code src}.
+   * @return The copy, which may be {@code dst} if it was reused.
+   */
+  private static byte[] copy(byte[] src, byte[] dst) {
+    if (src == null) {
+      return dst;
+    }
+
+    if (dst == null || dst.length < src.length) {
+      return Arrays.copyOf(src, src.length);
+    } else {
+      System.arraycopy(src, 0, dst, 0, src.length);
+      return dst;
+    }
+  }
 }