diff --git a/library/extractor/src/main/java/com/google/android/exoplayer2/extractor/avi/AviExtractor.java b/library/extractor/src/main/java/com/google/android/exoplayer2/extractor/avi/AviExtractor.java
index a854e3b86f..d4a97d065e 100644
--- a/library/extractor/src/main/java/com/google/android/exoplayer2/extractor/avi/AviExtractor.java
+++ b/library/extractor/src/main/java/com/google/android/exoplayer2/extractor/avi/AviExtractor.java
@@ -110,15 +110,15 @@ public class AviExtractor implements Extractor {
   static final int AVIIF_KEYFRAME = 16;
 
 
-  static final int RIFF = 'R' | ('I' << 8) | ('F' << 16) | ('F' << 24);
-  static final int AVI_ = 'A' | ('V' << 8) | ('I' << 16) | (' ' << 24);
+  static final int RIFF = 0x46464952; // RIFF
+  static final int AVI_ = 0x20495641; // AVI<space>
   //movie data box
-  static final int MOVI = 'm' | ('o' << 8) | ('v' << 16) | ('i' << 24);
+  static final int MOVI = 0x69766f6d; // movi
   //Index
-  static final int IDX1 = 'i' | ('d' << 8) | ('x' << 16) | ('1' << 24);
+  static final int IDX1 = 0x31786469; // idx1
 
-  static final int JUNK = 'J' | ('U' << 8) | ('N' << 16) | ('K' << 24);
-  static final int REC_ = 'r' | ('e' << 8) | ('c' << 16) | (' ' << 24);
+  static final int JUNK = 0x4b4e554a; // JUNK
+  static final int REC_ = 0x20636572; // rec<space>
 
   @VisibleForTesting
   int state;
diff --git a/library/extractor/src/main/java/com/google/android/exoplayer2/extractor/avi/AviHeaderBox.java b/library/extractor/src/main/java/com/google/android/exoplayer2/extractor/avi/AviHeaderBox.java
index 0a40b85218..4feb65c70e 100644
--- a/library/extractor/src/main/java/com/google/android/exoplayer2/extractor/avi/AviHeaderBox.java
+++ b/library/extractor/src/main/java/com/google/android/exoplayer2/extractor/avi/AviHeaderBox.java
@@ -25,7 +25,7 @@ public class AviHeaderBox extends ResidentBox {
   static final int LEN = 0x38;
   static final int AVIF_HASINDEX = 0x10;
   private static final int AVIF_MUSTUSEINDEX = 0x20;
-  static final int AVIH = 'a' | ('v' << 8) | ('i' << 16) | ('h' << 24);
+  static final int AVIH = 0x68697661; // avih
 
   AviHeaderBox(int type, int size, ByteBuffer byteBuffer) {
     super(type, size, byteBuffer);
diff --git a/library/extractor/src/main/java/com/google/android/exoplayer2/extractor/avi/ListBox.java b/library/extractor/src/main/java/com/google/android/exoplayer2/extractor/avi/ListBox.java
index 761328c4e1..4e0a8ebd7f 100644
--- a/library/extractor/src/main/java/com/google/android/exoplayer2/extractor/avi/ListBox.java
+++ b/library/extractor/src/main/java/com/google/android/exoplayer2/extractor/avi/ListBox.java
@@ -27,11 +27,9 @@ import java.util.List;
  * An AVI LIST box.  Similar to a Java List<Box>
  */
 public class ListBox extends Box {
-  public static final int LIST = 'L' | ('I' << 8) | ('S' << 16) | ('T' << 24);
-  //Header List
-  public static final int TYPE_HDRL = 'h' | ('d' << 8) | ('r' << 16) | ('l' << 24);
-  //Stream List
-  public static final int TYPE_STRL = 's' | ('t' << 8) | ('r' << 16) | ('l' << 24);
+  public static final int LIST = 0x5453494c; // LIST
+  public static final int TYPE_HDRL = 0x6c726468; // hdrl - Header List
+  public static final int TYPE_STRL = 0x6c727473; // strl - Stream List
 
   private final int listType;
 
diff --git a/library/extractor/src/main/java/com/google/android/exoplayer2/extractor/avi/StreamFormatBox.java b/library/extractor/src/main/java/com/google/android/exoplayer2/extractor/avi/StreamFormatBox.java
index 9cbabdfeba..e7f551c1ef 100644
--- a/library/extractor/src/main/java/com/google/android/exoplayer2/extractor/avi/StreamFormatBox.java
+++ b/library/extractor/src/main/java/com/google/android/exoplayer2/extractor/avi/StreamFormatBox.java
@@ -22,7 +22,7 @@ import java.nio.ByteBuffer;
  * Wrapper around the various StreamFormats
  */
 public class StreamFormatBox extends ResidentBox {
-  public static final int STRF = 's' | ('t' << 8) | ('r' << 16) | ('f' << 24);
+  public static final int STRF = 0x66727473; // strf
 
   StreamFormatBox(int type, int size, ByteBuffer byteBuffer) {
     super(type, size, byteBuffer);
diff --git a/library/extractor/src/main/java/com/google/android/exoplayer2/extractor/avi/StreamHeaderBox.java b/library/extractor/src/main/java/com/google/android/exoplayer2/extractor/avi/StreamHeaderBox.java
index 58a8859efa..da4353f1fc 100644
--- a/library/extractor/src/main/java/com/google/android/exoplayer2/extractor/avi/StreamHeaderBox.java
+++ b/library/extractor/src/main/java/com/google/android/exoplayer2/extractor/avi/StreamHeaderBox.java
@@ -22,13 +22,13 @@ import java.nio.ByteBuffer;
  * Wrapper around the AVISTREAMHEADER structure
  */
 public class StreamHeaderBox extends ResidentBox {
-  public static final int STRH = 's' | ('t' << 8) | ('r' << 16) | ('h' << 24);
+  public static final int STRH = 0x68727473; // strh
 
   //Audio Stream
-  static final int AUDS = 'a' | ('u' << 8) | ('d' << 16) | ('s' << 24);
+  static final int AUDS = 0x73647561; // auds
 
   //Videos Stream
-  static final int VIDS = 'v' | ('i' << 8) | ('d' << 16) | ('s' << 24);
+  static final int VIDS = 0x73646976; // vids
 
   StreamHeaderBox(int type, int size, ByteBuffer byteBuffer) {
     super(type, size, byteBuffer);
diff --git a/library/extractor/src/main/java/com/google/android/exoplayer2/extractor/avi/StreamNameBox.java b/library/extractor/src/main/java/com/google/android/exoplayer2/extractor/avi/StreamNameBox.java
index 03d1757047..f8e6a71bbe 100644
--- a/library/extractor/src/main/java/com/google/android/exoplayer2/extractor/avi/StreamNameBox.java
+++ b/library/extractor/src/main/java/com/google/android/exoplayer2/extractor/avi/StreamNameBox.java
@@ -21,7 +21,7 @@ import java.nio.ByteBuffer;
  * Box containing a human readable stream name
  */
 public class StreamNameBox extends ResidentBox {
-  public static final int STRN = 's' | ('t' << 8) | ('r' << 16) | ('n' << 24);
+  public static final int STRN = 0x6e727473; // strn
 
   StreamNameBox(int type, int size, ByteBuffer byteBuffer) {
     super(type, size, byteBuffer);
diff --git a/library/extractor/src/main/java/com/google/android/exoplayer2/extractor/avi/VideoFormat.java b/library/extractor/src/main/java/com/google/android/exoplayer2/extractor/avi/VideoFormat.java
index 9f12ff813f..ff10c3f99d 100644
--- a/library/extractor/src/main/java/com/google/android/exoplayer2/extractor/avi/VideoFormat.java
+++ b/library/extractor/src/main/java/com/google/android/exoplayer2/extractor/avi/VideoFormat.java
@@ -25,7 +25,7 @@ import java.util.HashMap;
  */
 public class VideoFormat {
 
-  static final int XVID = 'X' | ('V' << 8) | ('I' << 16) | ('D' << 24);
+  static final int XVID = 0x44495658; // XVID
 
   private static final HashMap<Integer, String> STREAM_MAP = new HashMap<>();
 
@@ -34,21 +34,21 @@ public class VideoFormat {
     final String mimeType = MimeTypes.VIDEO_MP4V;
 
     //I've never seen an Android devices that actually supports MP42
-    STREAM_MAP.put('M' | ('P' << 8) | ('4' << 16) | ('2' << 24), MimeTypes.VIDEO_MP42);
+    STREAM_MAP.put(0x3234504d, MimeTypes.VIDEO_MP42); // MP42
     //Samsung seems to support the rare MP43.
-    STREAM_MAP.put('M' | ('P' << 8) | ('4' << 16) | ('3' << 24), MimeTypes.VIDEO_MP43);
-    STREAM_MAP.put('H' | ('2' << 8) | ('6' << 16) | ('4' << 24), MimeTypes.VIDEO_H264);
-    STREAM_MAP.put('a' | ('v' << 8) | ('c' << 16) | ('1' << 24), MimeTypes.VIDEO_H264);
-    STREAM_MAP.put('A' | ('V' << 8) | ('C' << 16) | ('1' << 24), MimeTypes.VIDEO_H264);
-    STREAM_MAP.put('3' | ('V' << 8) | ('I' << 16) | ('D' << 24), mimeType);
-    STREAM_MAP.put('d' | ('i' << 8) | ('v' << 16) | ('x' << 24), mimeType);
-    STREAM_MAP.put('D' | ('I' << 8) | ('V' << 16) | ('X' << 24), mimeType);
-    STREAM_MAP.put('D' | ('X' << 8) | ('5' << 16) | ('0' << 24), mimeType);
-    STREAM_MAP.put('F' | ('M' << 8) | ('P' << 16) | ('4' << 24), mimeType);
-    STREAM_MAP.put('x' | ('v' << 8) | ('i' << 16) | ('d' << 24), mimeType);
-    STREAM_MAP.put(XVID, mimeType);
-    STREAM_MAP.put('M' | ('J' << 8) | ('P' << 16) | ('G' << 24), MimeTypes.VIDEO_MJPEG);
-    STREAM_MAP.put('m' | ('j' << 8) | ('p' << 16) | ('g' << 24), MimeTypes.VIDEO_MJPEG);
+    STREAM_MAP.put(0x3334504d, MimeTypes.VIDEO_MP43); // MP43
+    STREAM_MAP.put(0x34363248, MimeTypes.VIDEO_H264); // H264
+    STREAM_MAP.put(0x31637661, MimeTypes.VIDEO_H264); // avc1
+    STREAM_MAP.put(0x31435641, MimeTypes.VIDEO_H264); // AVC1
+    STREAM_MAP.put(0x44495633, mimeType); // 3VID
+    STREAM_MAP.put(0x78766964, mimeType); // divx
+    STREAM_MAP.put(0x58564944, mimeType); // DIVX
+    STREAM_MAP.put(0x30355844, mimeType); // DX50
+    STREAM_MAP.put(0x34504d46, mimeType); // FMP4
+    STREAM_MAP.put(0x64697678, mimeType); // xvid
+    STREAM_MAP.put(XVID, mimeType); // XVID
+    STREAM_MAP.put(0x47504a4d, MimeTypes.VIDEO_MJPEG); // MJPG
+    STREAM_MAP.put(0x67706a6d, MimeTypes.VIDEO_MJPEG); // mjpg
   }
 
   private final ByteBuffer byteBuffer;