Define DATA_TYPE constants in C.

Things like manifests are loaded not in the context of a Chunk,
but we want to eventually be reporting all loading events. So
it makes senes to define data types at a global level.

Also added {@code} in a few places for consistency.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=124549737

library/src/main/java/com/google/android/exoplayer/C.java

@@ -152,6 +152,37 @@ public interface C {
    */
   int RESULT_MAX_LENGTH_EXCEEDED = -2;
 
+  /**
+   * A data type constant for data of unknown or unspecified type.
+   */
+  int DATA_TYPE_UNKNOWN = 0;
+
+  /**
+   * A data type constant for media, typically containing media samples.
+   */
+  int DATA_TYPE_MEDIA = 1;
+
+  /**
+   * A data type constant for media, typically containing only initialization data.
+   */
+  int DATA_TYPE_MEDIA_INITIALIZATION = 2;
+
+  /**
+   * A data type constant for drm or encryption related data.
+   */
+  int DATA_TYPE_DRM = 3;
+
+  /**
+   * A data type constant for a manifest file.
+   */
+  int DATA_TYPE_MANIFEST = 4;
+
+  /**
+   * Applications or extensions may define custom {@code DATA_TYPE_*} constants greater than or
+   * equal to this value.
+   */
+  int DATA_TYPE_CUSTOM_BASE = 10000;
+
   /**
    * A type constant for tracks of unknown type.
    */
@@ -258,7 +289,8 @@ public interface C {
   int MSG_SET_PLAYBACK_PARAMS = 3;
 
   /**
-   * A minimum value for custom {@link TrackRenderer} message types.
+   * Applications or extensions may define custom {@code MSG_*} constants greater than or equal to
+   * this value.
    */
   int MSG_CUSTOM_BASE = 10000;
 

library/src/main/java/com/google/android/exoplayer/SimpleExoPlayer.java

@@ -159,7 +159,7 @@ public final class SimpleExoPlayer implements ExoPlayer {
    *
    * @see TrackRenderer#getTrackType()
    * @param index The index of the renderer.
-   * @return One of the TRACK_TYPE_* constants defined in {@link C}.
+   * @return One of the {@code TRACK_TYPE_*} constants defined in {@link C}.
    */
   public int getRendererType(int index) {
     return renderers[index].getTrackType();

library/src/main/java/com/google/android/exoplayer/TrackRenderer.java

@@ -142,7 +142,7 @@ public abstract class TrackRenderer implements ExoPlayerComponent {
   /**
    * Returns the current state of the renderer.
    *
-   * @return The current state (one of the STATE_* constants).
+   * @return The current state (one of the {@code STATE_*} constants).
    */
   protected final int getState() {
     return state;
@@ -346,7 +346,7 @@ public abstract class TrackRenderer implements ExoPlayerComponent {
    * {@link C#TRACK_TYPE_VIDEO}, an audio renderer will return {@link C#TRACK_TYPE_AUDIO}, a text
    * renderer will return {@link C#TRACK_TYPE_TEXT}, and so on.
    *
-   * @return One of the TRACK_TYPE_* constants defined in {@link C}.
+   * @return One of the {@code TRACK_TYPE_*} constants defined in {@link C}.
    */
   public abstract int getTrackType();
 

library/src/main/java/com/google/android/exoplayer/TrackSelectionPolicy.java

@@ -52,7 +52,7 @@ public abstract class TrackSelectionPolicy {
    * @param rendererTrackGroupArrays An array of {@link TrackGroupArray}s where each entry
    *     corresponds to the {@link TrackRenderer} of equal index in {@code renderers}.
    * @param rendererFormatSupports Maps every available track to a specific level of support as
-   *     defined by the {@link TrackRenderer} FORMAT_* constants.
+   *     defined by the {@link TrackRenderer} {@code FORMAT_*} constants.
    * @throws ExoPlaybackException If an error occurs while selecting the tracks.
    */
   /* package */ abstract TrackSelection[] selectTracks(TrackRenderer[] renderers,

library/src/main/java/com/google/android/exoplayer/chunk/Chunk.java

@@ -15,6 +15,7 @@
  */
 package com.google.android.exoplayer.chunk;
 
+import com.google.android.exoplayer.C;
 import com.google.android.exoplayer.Format;
 import com.google.android.exoplayer.upstream.DataSource;
 import com.google.android.exoplayer.upstream.DataSpec;
@@ -27,31 +28,6 @@ import com.google.android.exoplayer.util.Assertions;
  */
 public abstract class Chunk implements Loadable {
 
-  /**
-   * Value of {@link #type} for chunks containing unspecified data.
-   */
-  public static final int TYPE_UNSPECIFIED = 0;
-  /**
-   * Value of {@link #type} for chunks containing media data.
-   */
-  public static final int TYPE_MEDIA = 1;
-  /**
-   * Value of {@link #type} for chunks containing media initialization data.
-   */
-  public static final int TYPE_MEDIA_INITIALIZATION = 2;
-  /**
-   * Value of {@link #type} for chunks containing drm related data.
-   */
-  public static final int TYPE_DRM = 3;
-  /**
-   * Value of {@link #type} for chunks containing manifest or playlist data.
-   */
-  public static final int TYPE_MANIFEST = 4;
-  /**
-   * Implementations may define custom {@link #type} codes greater than or equal to this value.
-   */
-  public static final int TYPE_CUSTOM_BASE = 10000;
-
   /**
    * Value of {@link #trigger} for a load whose reason is unspecified.
    */
@@ -78,7 +54,8 @@ public abstract class Chunk implements Loadable {
   public static final int TRIGGER_CUSTOM_BASE = 10000;
 
   /**
-   * The type of the chunk. For reporting only.
+   * The type of the chunk. One of the {@code DATA_TYPE_*} constants defined in {@link C}. For
+   * reporting only.
    */
   public final int type;
   /**

library/src/main/java/com/google/android/exoplayer/chunk/InitializationChunk.java

@@ -15,6 +15,7 @@
  */
 package com.google.android.exoplayer.chunk;
 
+import com.google.android.exoplayer.C;
 import com.google.android.exoplayer.Format;
 import com.google.android.exoplayer.chunk.ChunkExtractorWrapper.SingleTrackMetadataOutput;
 import com.google.android.exoplayer.extractor.DefaultExtractorInput;
@@ -57,7 +58,7 @@ public final class InitializationChunk extends Chunk implements SingleTrackMetad
    */
   public InitializationChunk(DataSource dataSource, DataSpec dataSpec, int trigger, Format format,
       ChunkExtractorWrapper extractorWrapper) {
-    super(dataSource, dataSpec, Chunk.TYPE_MEDIA_INITIALIZATION, trigger, format);
+    super(dataSource, dataSpec, C.DATA_TYPE_MEDIA_INITIALIZATION, trigger, format);
     this.extractorWrapper = extractorWrapper;
   }
 

library/src/main/java/com/google/android/exoplayer/chunk/MediaChunk.java

@@ -15,6 +15,7 @@
  */
 package com.google.android.exoplayer.chunk;
 
+import com.google.android.exoplayer.C;
 import com.google.android.exoplayer.Format;
 import com.google.android.exoplayer.upstream.DataSource;
 import com.google.android.exoplayer.upstream.DataSpec;
@@ -49,7 +50,7 @@ public abstract class MediaChunk extends Chunk {
    */
   public MediaChunk(DataSource dataSource, DataSpec dataSpec, int trigger, Format format,
       long startTimeUs, long endTimeUs, int chunkIndex) {
-    super(dataSource, dataSpec, Chunk.TYPE_MEDIA, trigger, format);
+    super(dataSource, dataSpec, C.DATA_TYPE_MEDIA, trigger, format);
     Assertions.checkNotNull(format);
     this.startTimeUs = startTimeUs;
     this.endTimeUs = endTimeUs;

library/src/main/java/com/google/android/exoplayer/hls/HlsChunkSource.java

@@ -558,7 +558,7 @@ public class HlsChunkSource {
     public MediaPlaylistChunk(DataSource dataSource, DataSpec dataSpec, Format format,
         byte[] scratchSpace, HlsPlaylistParser playlistParser, int variantIndex,
         Uri playlistUri) {
-      super(dataSource, dataSpec, Chunk.TYPE_MANIFEST, Chunk.TRIGGER_UNSPECIFIED, format,
+      super(dataSource, dataSpec, C.DATA_TYPE_MANIFEST, Chunk.TRIGGER_UNSPECIFIED, format,
           scratchSpace);
       this.variantIndex = variantIndex;
       this.playlistParser = playlistParser;
@@ -585,7 +585,7 @@ public class HlsChunkSource {
 
     public EncryptionKeyChunk(DataSource dataSource, DataSpec dataSpec, Format format,
         byte[] scratchSpace, String iv) {
-      super(dataSource, dataSpec, Chunk.TYPE_DRM, Chunk.TRIGGER_UNSPECIFIED, format,
+      super(dataSource, dataSpec, C.DATA_TYPE_DRM, Chunk.TRIGGER_UNSPECIFIED, format,
           scratchSpace);
       this.iv = iv;
     }

library/src/main/java/com/google/android/exoplayer/util/Util.java

@@ -729,7 +729,8 @@ public final class Util {
   }
 
   /**
-   * Maps a {@link C} TRACK_TYPE_* constant to its corresponding DEFAULT_*_BUFFER_SIZE value.
+   * Maps a {@link C} {@code TRACK_TYPE_*} constant to the corresponding {@link C}
+   * {@code DEFAULT_*_BUFFER_SIZE} constant.
    *
    * @param trackType The track type.
    * @return The corresponding default buffer size in bytes.