Use shifting for flag constants

Lint likes flags to be declared in this way, for safety, apparently

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=207545382

library/core/src/main/java/com/google/android/exoplayer2/C.java

@@ -380,14 +380,10 @@ public final class C {
    * Flag for empty buffers that signal that the end of the stream was reached.
    */
   public static final int BUFFER_FLAG_END_OF_STREAM = MediaCodec.BUFFER_FLAG_END_OF_STREAM;
-  /**
-   * Indicates that a buffer is (at least partially) encrypted.
-   */
-  public static final int BUFFER_FLAG_ENCRYPTED = 0x40000000;
-  /**
-   * Indicates that a buffer should be decoded but not rendered.
-   */
-  public static final int BUFFER_FLAG_DECODE_ONLY = 0x80000000;
+  /** Indicates that a buffer is (at least partially) encrypted. */
+  public static final int BUFFER_FLAG_ENCRYPTED = 1 << 30; // 0x40000000
+  /** Indicates that a buffer should be decoded but not rendered. */
+  public static final int BUFFER_FLAG_DECODE_ONLY = 1 << 31; // 0x80000000
 
   /**
    * Video scaling modes for {@link MediaCodec}-based {@link Renderer}s.
@@ -421,15 +417,13 @@ public final class C {
    * Indicates that the track should be selected if user preferences do not state otherwise.
    */
   public static final int SELECTION_FLAG_DEFAULT = 1;
-  /**
-   * Indicates that the track must be displayed. Only applies to text tracks.
-   */
-  public static final int SELECTION_FLAG_FORCED = 2;
+  /** Indicates that the track must be displayed. Only applies to text tracks. */
+  public static final int SELECTION_FLAG_FORCED = 1 << 1; // 2
   /**
    * Indicates that the player may choose to play the track in absence of an explicit user
    * preference.
    */
-  public static final int SELECTION_FLAG_AUTOSELECT = 4;
+  public static final int SELECTION_FLAG_AUTOSELECT = 1 << 2; // 4
 
   /**
    * Represents an undetermined language as an ISO 639 alpha-3 language code.

library/core/src/main/java/com/google/android/exoplayer2/extractor/mp4/FragmentedMp4Extractor.java

@@ -77,24 +77,20 @@ public final class FragmentedMp4Extractor implements Extractor {
    * This flag does nothing if the stream is not a video stream.
    */
   public static final int FLAG_WORKAROUND_EVERY_VIDEO_FRAME_IS_SYNC_FRAME = 1;
-  /**
-   * Flag to ignore any tfdt boxes in the stream.
-   */
-  public static final int FLAG_WORKAROUND_IGNORE_TFDT_BOX = 2;
+  /** Flag to ignore any tfdt boxes in the stream. */
+  public static final int FLAG_WORKAROUND_IGNORE_TFDT_BOX = 1 << 1; // 2
   /**
    * Flag to indicate that the extractor should output an event message metadata track. Any event
    * messages in the stream will be delivered as samples to this track.
    */
-  public static final int FLAG_ENABLE_EMSG_TRACK = 4;
+  public static final int FLAG_ENABLE_EMSG_TRACK = 1 << 2; // 4
   /**
    * Flag to indicate that the {@link Track} was sideloaded, instead of being declared by the MP4
    * container.
    */
-  private static final int FLAG_SIDELOADED = 8;
-  /**
-   * Flag to ignore any edit lists in the stream.
-   */
-  public static final int FLAG_WORKAROUND_IGNORE_EDIT_LISTS = 16;
+  private static final int FLAG_SIDELOADED = 1 << 3; // 8
+  /** Flag to ignore any edit lists in the stream. */
+  public static final int FLAG_WORKAROUND_IGNORE_EDIT_LISTS = 1 << 4; // 16
 
   private static final String TAG = "FragmentedMp4Extractor";
   private static final int SAMPLE_GROUP_TYPE_seig = Util.getIntegerCodeForString("seig");

library/core/src/main/java/com/google/android/exoplayer2/upstream/DataSpec.java

@@ -46,13 +46,13 @@ public final class DataSpec {
    * {@link DataSource#open(DataSpec)} will typically be {@link C#LENGTH_UNSET}. The data read from
    * {@link DataSource#read(byte[], int, int)} will be the decompressed data.
    */
-  public static final int FLAG_ALLOW_GZIP = 1 << 0;
+  public static final int FLAG_ALLOW_GZIP = 1;
 
   /**
    * Permits content to be cached even if its length can not be resolved. Typically this's the case
    * for progressive live streams and when {@link #FLAG_ALLOW_GZIP} is used.
    */
-  public static final int FLAG_ALLOW_CACHING_UNKNOWN_LENGTH = 1 << 1;
+  public static final int FLAG_ALLOW_CACHING_UNKNOWN_LENGTH = 1 << 1; // 2
 
   /**
    * The source from which data should be read.

library/core/src/main/java/com/google/android/exoplayer2/upstream/cache/CacheDataSource.java

@@ -65,20 +65,20 @@ public final class CacheDataSource implements DataSource {
    * A flag indicating whether we will block reads if the cache key is locked. If unset then data is
    * read from upstream if the cache key is locked, regardless of whether the data is cached.
    */
-  public static final int FLAG_BLOCK_ON_CACHE = 1 << 0;
+  public static final int FLAG_BLOCK_ON_CACHE = 1;
 
   /**
    * A flag indicating whether the cache is bypassed following any cache related error. If set
    * then cache related exceptions may be thrown for one cycle of open, read and close calls.
    * Subsequent cycles of these calls will then bypass the cache.
    */
-  public static final int FLAG_IGNORE_CACHE_ON_ERROR = 1 << 1;
+  public static final int FLAG_IGNORE_CACHE_ON_ERROR = 1 << 1; // 2
 
   /**
    * A flag indicating that the cache should be bypassed for requests whose lengths are unset. This
    * flag is provided for legacy reasons only.
    */
-  public static final int FLAG_IGNORE_CACHE_FOR_UNSET_LENGTH_REQUESTS = 1 << 2;
+  public static final int FLAG_IGNORE_CACHE_FOR_UNSET_LENGTH_REQUESTS = 1 << 2; // 4
 
   /** Reasons the cache may be ignored. */
   @Retention(RetentionPolicy.SOURCE)

library/core/src/main/java/com/google/android/exoplayer2/util/RepeatModeUtil.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017 The Android Open Source Project
+ * Copyright (C) 2017 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -40,10 +40,8 @@ public final class RepeatModeUtil {
    * "Repeat One" button enabled.
    */
   public static final int REPEAT_TOGGLE_MODE_ONE = 1;
-  /**
-   * "Repeat All" button enabled.
-   */
-  public static final int REPEAT_TOGGLE_MODE_ALL = 2;
+  /** "Repeat All" button enabled. */
+  public static final int REPEAT_TOGGLE_MODE_ALL = 1 << 1; // 2
 
   private RepeatModeUtil() {
     // Prevent instantiation.