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SubtitleData

public final class SubtitleData
extends Object

java.lang.Object
   ↳ androidx.media2.SubtitleData

Class encapsulating subtitle data, as received through the MediaPlayer.PlayerCallback.onSubtitleData(MediaPlayer, MediaItem, SubtitleData) interface. The subtitle data includes:

  • the track index
  • the start time (in microseconds) of the data
  • the duration (in microseconds) of the data
  • the actual data.
The data is stored in a byte-array, and is encoded in one of the supported in-band subtitle formats. The subtitle encoding is determined by the MIME type of the MediaPlayer.TrackInfo of the subtitle track, one of MIMETYPE_TEXT_CEA_608, MIMETYPE_TEXT_CEA_708, MIMETYPE_TEXT_VTT.

Here is an example of iterating over the tracks of a MediaPlayer, and checking which encoding is used for the subtitle tracks: 

 MediaPlayer mp = new MediaPlayer(context);
 // prepare the player with a valid media item.
 …

 final TrackInfo[] trackInfos = mp.getTrackInfo();
 for (TrackInfo info : trackInfo) {
     if (info.getTrackType() == TrackInfo.MEDIA_TRACK_TYPE_SUBTITLE) {
         final String mime = info.getFormat().getString(MediaFormat.KEY_MIME);
         if (SubtitleData.MIMETYPE_TEXT_CEA_608.equals(mime) {
             // subtitle encoding is CEA 608
         } else if (SubtitleData.MIMETYPE_TEXT_CEA_708.equals(mime) {
             // subtitle encoding is CEA 708
         } else if (SubtitleData.MIMETYPE_TEXT_VTT.equals(mime) {
             // subtitle encoding is WebVTT
         }
     }
 }

Summary

Constants

String MIMETYPE_TEXT_CEA_608

MIME type for CEA-608 closed caption data.

String MIMETYPE_TEXT_CEA_708

MIME type for CEA-708 closed caption data.

String MIMETYPE_TEXT_VTT

MIME type for WebVTT subtitle data.

Public methods

byte[] getData()

Returns the encoded data for the subtitle content.

long getDurationUs()

Returns the duration in microsecond during which the subtitle should be displayed.

long getStartTimeUs()

Returns the media time at which the subtitle should be displayed, expressed in microseconds.

int getTrackIndex()

Returns the index of the MediaPlayer track which contains this subtitle data.

Inherited methods

Constants

MIMETYPE_TEXT_CEA_608

public static final String MIMETYPE_TEXT_CEA_608

MIME type for CEA-608 closed caption data.

Constant Value: "text/cea-608"

MIMETYPE_TEXT_CEA_708

public static final String MIMETYPE_TEXT_CEA_708

MIME type for CEA-708 closed caption data.

Constant Value: "text/cea-708"

MIMETYPE_TEXT_VTT

public static final String MIMETYPE_TEXT_VTT

MIME type for WebVTT subtitle data.

Constant Value: "text/vtt"

Public methods

getData

public byte[] getData ()

Returns the encoded data for the subtitle content. Encoding format depends on the subtitle type, refer to CEA 708, CEA/EIA 608 and WebVTT, defined by the MIME type of the subtitle track.

Returns
byte[] the encoded subtitle data

getDurationUs

public long getDurationUs ()

Returns the duration in microsecond during which the subtitle should be displayed.

Returns
long the display duration for the subtitle

getStartTimeUs

public long getStartTimeUs ()

Returns the media time at which the subtitle should be displayed, expressed in microseconds.

Returns
long the display start time for the subtitle

getTrackIndex

public int getTrackIndex ()

Returns the index of the MediaPlayer track which contains this subtitle data.

Returns
int an index in the array returned by MediaPlayer.getTrackInfo().