Calculating seek positions for PlaybackSeekMetadataDataProvider

PlaybackSeekMetadataDataProvider.java

public class PlaybackSeekMetadataDataProvider extends PlaybackSeekDataProvider {
  //…
  public PlaybackSeekMetadataDataProvider(Context context, 
                                          String videoUrl, 
                                          long interval) {
    mContext = context;
    mVideoUrl = videoUrl;

    MediaMetadataRetriever retriever = new MediaMetadataRetriever();
    retriever.setDataSource(mVideoUrl, new HashMap<>());

    long duration = Long.parseLong(
      retriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_DURATION));

    int size = (int) (duration / interval) + 1;
    mSeekPositions = new long[size];
    for (int i = 0; i < size; i++) {
      mSeekPositions[i] = i * interval;
    }
  }
  //…
}