SubtitleData

Kotlin |Java

class SubtitleData

kotlin.Any
↳	android.media.SubtitleData

Class encapsulating subtitle data, as received through the MediaPlayer.OnSubtitleDataListener 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 MediaFormat.MIMETYPE_TEXT_CEA_608, MediaFormat.MIMETYPE_TEXT_CEA_708, MediaFormat.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();
  mp.setDataSource(myContentLocation);
  mp.prepare(); // synchronous prepare, ready to use when method returns
  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 (MediaFormat.MIMETYPE_TEXT_CEA_608.equals(mime) {
              // subtitle encoding is CEA 608
          } else if (MediaFormat.MIMETYPE_TEXT_CEA_708.equals(mime) {
              // subtitle encoding is CEA 708
          } else if (MediaFormat.MIMETYPE_TEXT_VTT.equals(mime) {
              // subtitle encoding is WebVTT
          }
      }
  }

See MediaPlayer.setOnSubtitleDataListener(android.media.MediaPlayer.OnSubtitleDataListener, android.os.Handler) to receive subtitle data from a MediaPlayer object.

Summary

Public constructors
`SubtitleData(trackIndex: Int, startTimeUs: Long, durationUs: Long, data: ByteArray)` Constructor.

Public methods
ByteArray	`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 media player track which contains this subtitle data.

Public constructors

SubtitleData

Added in API level 29

SubtitleData(
    trackIndex: Int, 
    startTimeUs: Long, 
    durationUs: Long, 
    data: ByteArray)

Constructor.

Parameters
`trackIndex`	Int: the index of the media player track which contains this subtitle data.
`startTimeUs`	Long: the start time in microsecond for the subtitle data
`durationUs`	Long: the duration in microsecond for the subtitle data
`data`	ByteArray: the data array for the subtitle data. It should not be null. No data copying is made.

Public methods

getData

Added in API level 28

fun getData(): ByteArray

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.

Return
`ByteArray`	the encoded subtitle data This value cannot be `null`.

getDurationUs

Added in API level 28

fun getDurationUs(): Long

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

Return
`Long`	the display duration for the subtitle

getStartTimeUs

Added in API level 28

fun getStartTimeUs(): Long

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

Return
`Long`	the display start time for the subtitle

getTrackIndex

Added in API level 28

fun getTrackIndex(): Int

Returns the index of the media player track which contains this subtitle data.

Return
`Int`	an index in the array returned by `MediaPlayer.getTrackInfo()`.