Set MediaFormat for VTT chunks + cleanup.

ChunkSampleSource had a null check solely for the VTT case,
where DashChunkSource wasn't setting a MediaFormat on VTT
chunks. It's trivial to do so, and is more consistent, so I've
done that and removed the null check. Also done some small
tidying.

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

@@ -15,7 +15,6 @@
  */
 package com.google.android.exoplayer;
 
-import com.google.android.exoplayer.util.MimeTypes;
 import com.google.android.exoplayer.util.Util;
 
 import android.annotation.SuppressLint;
@@ -94,20 +93,8 @@ public class MediaFormat {
         channelCount, sampleRate, initializationData);
   }
 
-  public static MediaFormat createId3Format() {
-    return createFormatForMimeType(MimeTypes.APPLICATION_ID3);
-  }
-
-  public static MediaFormat createEia608Format() {
-    return createFormatForMimeType(MimeTypes.APPLICATION_EIA608);
-  }
-
-  public static MediaFormat createTtmlFormat() {
-    return createFormatForMimeType(MimeTypes.APPLICATION_TTML);
-  }
-
-  public static MediaFormat createTx3GFormat() {
-    return createFormatForMimeType(MimeTypes.APPLICATION_TX3G);
+  public static MediaFormat createTextFormat(String mimeType) {
+    return createFormatForMimeType(mimeType);
   }
 
   public static MediaFormat createFormatForMimeType(String mimeType) {

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

@@ -33,7 +33,7 @@ public abstract class BaseMediaChunk extends MediaChunk {
    * obtain the chunk's media format and drm initialization data. If false, these methods are only
    * guaranteed to return correct data after the first sample data has been output from the chunk.
    */
-  public final boolean isFormatFinal;
+  public final boolean isMediaFormatFinal;
 
   private DefaultTrackOutput output;
   private int firstSampleIndex;
@@ -47,16 +47,16 @@ public abstract class BaseMediaChunk extends MediaChunk {
    * @param endTimeUs The end time of the media contained by the chunk, in microseconds.
    * @param chunkIndex The index of the chunk.
    * @param isLastChunk True if this is the last chunk in the media. False otherwise.
-   * @param isFormatFinal True if {@link #getMediaFormat()} and {@link #getDrmInitData()} can be
-   *     called at any time to obtain the media format and drm initialization data. False if these
-   *     methods are only guaranteed to return correct data after the first sample data has been
-   *     output from the chunk.
+   * @param isMediaFormatFinal True if {@link #getMediaFormat()} and {@link #getDrmInitData()} can
+   *     be called at any time to obtain the media format and drm initialization data. False if
+   *     these methods are only guaranteed to return correct data after the first sample data has
+   *     been output from the chunk.
    */
   public BaseMediaChunk(DataSource dataSource, DataSpec dataSpec, int trigger, Format format,
       long startTimeUs, long endTimeUs, int chunkIndex, boolean isLastChunk,
-      boolean isFormatFinal) {
+      boolean isMediaFormatFinal) {
     super(dataSource, dataSpec, trigger, format, startTimeUs, endTimeUs, chunkIndex, isLastChunk);
-    this.isFormatFinal = isFormatFinal;
+    this.isMediaFormatFinal = isMediaFormatFinal;
   }
 
   /**
@@ -81,7 +81,7 @@ public abstract class BaseMediaChunk extends MediaChunk {
   /**
    * Gets the {@link MediaFormat} corresponding to the chunk.
    * <p>
-   * See {@link #isFormatFinal} for information about when this method is guaranteed to return
+   * See {@link #isMediaFormatFinal} for information about when this method is guaranteed to return
    * correct data.
    *
    * @return The {@link MediaFormat} corresponding to this chunk.
@@ -91,7 +91,7 @@ public abstract class BaseMediaChunk extends MediaChunk {
   /**
    * Gets the {@link DrmInitData} corresponding to the chunk.
    * <p>
-   * See {@link #isFormatFinal} for information about when this method is guaranteed to return
+   * See {@link #isMediaFormatFinal} for information about when this method is guaranteed to return
    * correct data.
    *
    * @return The {@link DrmInitData} corresponding to this chunk.

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

@@ -225,9 +225,9 @@ public class ChunkSampleSource implements SampleSource, Loader.Callback {
       downstreamFormat = currentChunk.format;
     }
 
-    if (haveSamples || currentChunk.isFormatFinal) {
+    if (haveSamples || currentChunk.isMediaFormatFinal) {
       MediaFormat mediaFormat = currentChunk.getMediaFormat();
-      if (mediaFormat != null && !mediaFormat.equals(downstreamMediaFormat, true)) {
+      if (!mediaFormat.equals(downstreamMediaFormat, true)) {
         chunkSource.getMaxVideoDimensions(mediaFormat);
         formatHolder.format = mediaFormat;
         formatHolder.drmInitData = currentChunk.getDrmInitData();

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

@@ -62,15 +62,15 @@ public class ContainerMediaChunk extends BaseMediaChunk implements SingleTrackOu
    *     known to define its own format.
    * @param drmInitData The {@link DrmInitData} for the chunk. Null if the media is not drm
    *     protected. May also be null if the data is known to define its own initialization data.
-   * @param isFormatFinal True if {@code mediaFormat} and {@code drmInitData} are known to be
+   * @param isMediaFormatFinal True if {@code mediaFormat} and {@code drmInitData} are known to be
    *     correct and final. False if the data may define its own format or initialization data.
    */
   public ContainerMediaChunk(DataSource dataSource, DataSpec dataSpec, int trigger, Format format,
       long startTimeUs, long endTimeUs, int chunkIndex, boolean isLastChunk, long sampleOffsetUs,
       ChunkExtractorWrapper extractorWrapper, MediaFormat mediaFormat, DrmInitData drmInitData,
-      boolean isFormatFinal) {
+      boolean isMediaFormatFinal) {
     super(dataSource, dataSpec, trigger, format, startTimeUs, endTimeUs, chunkIndex, isLastChunk,
-        isFormatFinal);
+        isMediaFormatFinal);
     this.extractorWrapper = extractorWrapper;
     this.sampleOffsetUs = sampleOffsetUs;
     this.mediaFormat = mediaFormat;

library/src/main/java/com/google/android/exoplayer/dash/DashChunkSource.java

@@ -503,8 +503,8 @@ public class DashChunkSource implements ChunkSource {
         representationHolder.vttHeaderOffsetUs = presentationTimeOffsetUs;
       }
       return new SingleSampleMediaChunk(dataSource, dataSpec, Chunk.TRIGGER_INITIAL,
-          representation.format, startTimeUs, endTimeUs, absoluteSegmentNum, isLastSegment, null,
-          null, representationHolder.vttHeader);
+          representation.format, startTimeUs, endTimeUs, absoluteSegmentNum, isLastSegment,
+          MediaFormat.createTextFormat(MimeTypes.TEXT_VTT), null, representationHolder.vttHeader);
     } else {
       return new ContainerMediaChunk(dataSource, dataSpec, trigger, representation.format,
           startTimeUs, endTimeUs, absoluteSegmentNum, isLastSegment, 0,

library/src/main/java/com/google/android/exoplayer/extractor/mp4/AtomParsers.java

@@ -339,9 +339,9 @@ import java.util.List;
         parseAudioSampleEntry(stsd, childAtomType, childStartPosition, childAtomSize, durationUs,
             holder, i);
       } else if (childAtomType == Atom.TYPE_TTML) {
-        holder.mediaFormat = MediaFormat.createTtmlFormat();
+        holder.mediaFormat = MediaFormat.createTextFormat(MimeTypes.APPLICATION_TTML);
       } else if (childAtomType == Atom.TYPE_tx3g) {
-        holder.mediaFormat = MediaFormat.createTx3GFormat();
+        holder.mediaFormat = MediaFormat.createTextFormat(MimeTypes.APPLICATION_TX3G);
       }
       stsd.setPosition(childStartPosition + childAtomSize);
     }

library/src/main/java/com/google/android/exoplayer/extractor/ts/Id3Reader.java

@@ -18,6 +18,7 @@ package com.google.android.exoplayer.extractor.ts;
 import com.google.android.exoplayer.C;
 import com.google.android.exoplayer.MediaFormat;
 import com.google.android.exoplayer.extractor.TrackOutput;
+import com.google.android.exoplayer.util.MimeTypes;
 import com.google.android.exoplayer.util.ParsableByteArray;
 
 /**
@@ -34,7 +35,7 @@ import com.google.android.exoplayer.util.ParsableByteArray;
 
   public Id3Reader(TrackOutput output) {
     super(output);
-    output.format(MediaFormat.createId3Format());
+    output.format(MediaFormat.createTextFormat(MimeTypes.APPLICATION_ID3));
   }
 
   @Override

library/src/main/java/com/google/android/exoplayer/extractor/ts/SeiReader.java

@@ -19,6 +19,7 @@ import com.google.android.exoplayer.C;
 import com.google.android.exoplayer.MediaFormat;
 import com.google.android.exoplayer.extractor.TrackOutput;
 import com.google.android.exoplayer.text.eia608.Eia608Parser;
+import com.google.android.exoplayer.util.MimeTypes;
 import com.google.android.exoplayer.util.ParsableByteArray;
 
 /**
@@ -31,7 +32,7 @@ import com.google.android.exoplayer.util.ParsableByteArray;
 
   public SeiReader(TrackOutput output) {
     super(output);
-    output.format(MediaFormat.createEia608Format());
+    output.format(MediaFormat.createTextFormat(MimeTypes.APPLICATION_EIA608));
   }
 
   @Override

library/src/main/java/com/google/android/exoplayer/smoothstreaming/SmoothStreamingChunkSource.java

@@ -395,7 +395,7 @@ public class SmoothStreamingChunkSource implements ChunkSource {
           trackFormat.numChannels, trackFormat.audioSamplingRate, csd);
       return format;
     } else if (streamElement.type == StreamElement.TYPE_TEXT) {
-      return MediaFormat.createFormatForMimeType(trackFormat.mimeType);
+      return MediaFormat.createTextFormat(trackFormat.mimeType);
     }
     return null;
   }