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.webvtt;
  
  import com.google.android.exoplayer2.C;
  import com.google.android.exoplayer2.text.Cue;
  import com.google.android.exoplayer2.text.Subtitle;
  import com.google.android.exoplayer2.util.Assertions;
  import com.google.android.exoplayer2.util.Util;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.Collections;
  import java.util.List;
  
  /** A representation of a WebVTT subtitle. */
  /* package */ final class WebvttSubtitle implements Subtitle {
  
    private final List<WebvttCueInfo> cueInfos;
    private final long[] cueTimesUs;
    private final long[] sortedCueTimesUs;
  
    /** Constructs a new WebvttSubtitle from a list of {@link WebvttCueInfo}s. */
    public WebvttSubtitle(List<WebvttCueInfo> cueInfos) {
      this.cueInfos = Collections.unmodifiableList(new ArrayList<>(cueInfos));
      cueTimesUs = new long[2 * cueInfos.size()];
      for (int cueIndex = 0; cueIndex < cueInfos.size(); cueIndex++) {
        WebvttCueInfo cueInfo = cueInfos.get(cueIndex);
        int arrayIndex = cueIndex * 2;
        cueTimesUs[arrayIndex] = cueInfo.startTimeUs;
        cueTimesUs[arrayIndex + 1] = cueInfo.endTimeUs;
      }
      sortedCueTimesUs = Arrays.copyOf(cueTimesUs, cueTimesUs.length);
      Arrays.sort(sortedCueTimesUs);
    }
  
    @Override
    public int getNextEventTimeIndex(long timeUs) {
      int index = Util.binarySearchCeil(sortedCueTimesUs, timeUs, false, false);
      return index < sortedCueTimesUs.length ? index : C.INDEX_UNSET;
    }
  
    @Override
    public int getEventTimeCount() {
      return sortedCueTimesUs.length;
    }
  
    @Override
    public long getEventTime(int index) {
      Assertions.checkArgument(index >= 0);
      Assertions.checkArgument(index < sortedCueTimesUs.length);
      return sortedCueTimesUs[index];
    }
  
    @Override
    public List<Cue> getCues(long timeUs) {
      List<Cue> currentCues = new ArrayList<>();
      List<WebvttCueInfo> cuesWithUnsetLine = new ArrayList<>();
      for (int i = 0; i < cueInfos.size(); i++) {
        if ((cueTimesUs[i * 2] <= timeUs) && (timeUs < cueTimesUs[i * 2 + 1])) {
          WebvttCueInfo cueInfo = cueInfos.get(i);
          if (cueInfo.cue.line == Cue.DIMEN_UNSET) {
            cuesWithUnsetLine.add(cueInfo);
          } else {
            currentCues.add(cueInfo.cue);
          }
        }
      }
      // Steps 4 - 10 of https://www.w3.org/TR/webvtt1/#cue-computed-line
      // (steps 1 - 3 are handled by WebvttCueParser#computeLine(float, int))
      Collections.sort(cuesWithUnsetLine, (c1, c2) -> Long.compare(c1.startTimeUs, c2.startTimeUs));
      for (int i = 0; i < cuesWithUnsetLine.size(); i++) {
        Cue cue = cuesWithUnsetLine.get(i).cue;
        currentCues.add(cue.buildUpon().setLine((float) (-1 - i), Cue.LINE_TYPE_NUMBER).build());
      }
      return currentCues;
    }
  }
  