diff --git a/library/common/src/main/java/com/google/android/exoplayer2/audio/Ac3Util.java b/library/common/src/main/java/com/google/android/exoplayer2/audio/Ac3Util.java
index d4042a99b1..f9a97d961f 100644
--- a/library/common/src/main/java/com/google/android/exoplayer2/audio/Ac3Util.java
+++ b/library/common/src/main/java/com/google/android/exoplayer2/audio/Ac3Util.java
@@ -24,6 +24,7 @@ import com.google.android.exoplayer2.drm.DrmInitData;
 import com.google.android.exoplayer2.util.MimeTypes;
 import com.google.android.exoplayer2.util.ParsableBitArray;
 import com.google.android.exoplayer2.util.ParsableByteArray;
+import com.google.android.exoplayer2.util.Util;
 import java.lang.annotation.Documented;
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
@@ -516,7 +517,7 @@ public final class Ac3Util {
     int endIndex = buffer.limit() - TRUEHD_SYNCFRAME_PREFIX_LENGTH;
     for (int i = startIndex; i <= endIndex; i++) {
       // The syncword ends 0xBA for TrueHD or 0xBB for MLP.
-      if ((buffer.getInt(i + 4) & 0xFEFFFFFF) == 0xBA6F72F8) {
+      if ((Util.getBigEndianInt(buffer, i + 4) & 0xFFFFFFFE) == 0xF8726FBA) {
         return i - startIndex;
       }
     }
diff --git a/library/common/src/main/java/com/google/android/exoplayer2/util/Util.java b/library/common/src/main/java/com/google/android/exoplayer2/util/Util.java
index 60fe1a39d4..6d8ca9e4b5 100644
--- a/library/common/src/main/java/com/google/android/exoplayer2/util/Util.java
+++ b/library/common/src/main/java/com/google/android/exoplayer2/util/Util.java
@@ -60,6 +60,8 @@ import java.io.IOException;
 import java.io.InputStream;
 import java.lang.reflect.Method;
 import java.math.BigDecimal;
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
 import java.nio.charset.Charset;
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -1859,6 +1861,21 @@ public final class Util {
     return initialValue;
   }
 
+  /**
+   * Absolute <i>get</i> method for reading an int value in {@link ByteOrder#BIG_ENDIAN} in a {@link
+   * ByteBuffer}. Same as {@link ByteBuffer#getInt(int)} except the buffer's order as returned by
+   * {@link ByteBuffer#order()} is ignored and {@link ByteOrder#BIG_ENDIAN} is used instead.
+   *
+   * @param buffer The buffer from which to read an int in big endian.
+   * @param index The index from which the bytes will be read.
+   * @return The int value at the given index with the buffer bytes ordered most significant to
+   *     least significant.
+   */
+  public static int getBigEndianInt(ByteBuffer buffer, int index) {
+    int value = buffer.getInt(index);
+    return buffer.order() == ByteOrder.BIG_ENDIAN ? value : Integer.reverseBytes(value);
+  }
+
   /**
    * Returns the {@link C.NetworkType} of the current network connection.
    *
diff --git a/library/common/src/test/java/com/google/android/exoplayer2/util/UtilTest.java b/library/common/src/test/java/com/google/android/exoplayer2/util/UtilTest.java
index 825988cf48..2e523a32c6 100644
--- a/library/common/src/test/java/com/google/android/exoplayer2/util/UtilTest.java
+++ b/library/common/src/test/java/com/google/android/exoplayer2/util/UtilTest.java
@@ -27,6 +27,8 @@ import static com.google.common.truth.Truth.assertThat;
 import androidx.test.ext.junit.runners.AndroidJUnit4;
 import com.google.android.exoplayer2.C;
 import com.google.android.exoplayer2.testutil.TestUtil;
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Random;
@@ -789,6 +791,30 @@ public class UtilTest {
     assertThat(result).isEqualTo(0x4);
   }
 
+  @Test
+  public void getBigEndianInt_fromBigEndian() {
+    byte[] bytes = {0x1F, 0x2E, 0x3D, 0x4C};
+    ByteBuffer byteBuffer = ByteBuffer.wrap(bytes).order(ByteOrder.BIG_ENDIAN);
+
+    assertThat(Util.getBigEndianInt(byteBuffer, 0)).isEqualTo(0x1F2E3D4C);
+  }
+
+  @Test
+  public void getBigEndianInt_fromLittleEndian() {
+    byte[] bytes = {(byte) 0xC2, (byte) 0xD3, (byte) 0xE4, (byte) 0xF5};
+    ByteBuffer byteBuffer = ByteBuffer.wrap(bytes).order(ByteOrder.LITTLE_ENDIAN);
+
+    assertThat(Util.getBigEndianInt(byteBuffer, 0)).isEqualTo(0xC2D3E4F5);
+  }
+
+  @Test
+  public void getBigEndianInt_unaligned() {
+    byte[] bytes = {9, 8, 7, 6, 5};
+    ByteBuffer byteBuffer = ByteBuffer.wrap(bytes).order(ByteOrder.LITTLE_ENDIAN);
+
+    assertThat(Util.getBigEndianInt(byteBuffer, 1)).isEqualTo(0x08070605);
+  }
+
   @Test
   public void inflate_withDeflatedData_success() {
     byte[] testData = TestUtil.buildTestData(/*arbitrary test data size*/ 256 * 1024);
diff --git a/library/core/src/main/java/com/google/android/exoplayer2/audio/DefaultAudioSink.java b/library/core/src/main/java/com/google/android/exoplayer2/audio/DefaultAudioSink.java
index a0aebdfe66..78699d41f4 100644
--- a/library/core/src/main/java/com/google/android/exoplayer2/audio/DefaultAudioSink.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/audio/DefaultAudioSink.java
@@ -1242,7 +1242,8 @@ public final class DefaultAudioSink implements AudioSink {
   private static int getFramesPerEncodedSample(@C.Encoding int encoding, ByteBuffer buffer) {
     switch (encoding) {
       case C.ENCODING_MP3:
-        return MpegAudioUtil.parseMpegAudioFrameSampleCount(buffer.get(buffer.position()));
+        int headerDataInBigEndian = Util.getBigEndianInt(buffer, buffer.position());
+        return MpegAudioUtil.parseMpegAudioFrameSampleCount(headerDataInBigEndian);
       case C.ENCODING_AAC_LC:
         return AacUtil.AAC_LC_AUDIO_SAMPLE_COUNT;
       case C.ENCODING_AAC_HE_V1: