content: /*
   * Copyright (C) 2016 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package com.google.android.exoplayer2.text;
  
  import com.google.android.exoplayer2.C;
  import java.util.List;
  
  /**
   * A subtitle consisting of timed {@link Cue}s.
   */
  public interface Subtitle {
  
    /**
     * Returns the index of the first event that occurs after a given time (exclusive).
     *
     * @param timeUs The time in microseconds.
     * @return The index of the next event, or {@link C#INDEX_UNSET} if there are no events after the
     *     specified time.
     */
    int getNextEventTimeIndex(long timeUs);
  
    /**
     * Returns the number of event times, where events are defined as points in time at which the cues
     * returned by {@link #getCues(long)} changes.
     *
     * @return The number of event times.
     */
    int getEventTimeCount();
  
    /**
     * Returns the event time at a specified index.
     *
     * @param index The index of the event time to obtain.
     * @return The event time in microseconds.
     */
    long getEventTime(int index);
  
    /**
     * Retrieve the cues that should be displayed at a given time.
     *
     * @param timeUs The time in microseconds.
     * @return A list of cues that should be displayed, possibly empty.
     */
    List<Cue> getCues(long timeUs);
  
  }
  