content: /*
   * Copyright 2002-2019 Drew Noakes and contributors
   *
   *    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
   *
   *        https://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.
   *
   * More information about this project is available at:
   *
   *    https://drewnoakes.com/code/exif/
   *    https://github.com/drewnoakes/metadata-extractor
   */
  package com.drew.metadata.mov.atoms;
  
  import com.drew.lang.SequentialReader;
  import com.drew.metadata.mov.QuickTimeContext;
  import com.drew.metadata.mov.media.QuickTimeVideoDirectory;
  
  import java.io.IOException;
  import java.util.ArrayList;
  
  /**
   * https://developer.apple.com/library/content/documentation/QuickTime/QTFF/QTFFChap2/qtff2.html#//apple_ref/doc/uid/TP40000939-CH204-BBCGFJII
   *
   * @author Payton Garland
   */
  public class TimeToSampleAtom extends FullAtom
  {
      private final ArrayList<Entry> entries;
  
      public TimeToSampleAtom(SequentialReader reader, Atom atom) throws IOException
      {
          super(reader, atom);
  
          long numberOfEntries = reader.getUInt32();
          if (numberOfEntries < Integer.MAX_VALUE) {
              entries = new ArrayList<Entry>((int)numberOfEntries);
              for (int i = 0; i < numberOfEntries; i++) {
                  entries.add(new Entry(reader));
              }
          } else {
              entries = new ArrayList<Entry>();
              // TODO surface this error somewhere
          }
      }
  
      static class Entry
      {
          long sampleCount;
          long sampleDuration;
  
          public Entry(SequentialReader reader) throws IOException
          {
              sampleCount = reader.getUInt32();
              sampleDuration = reader.getUInt32();
          }
      }
  
      public void addMetadata(QuickTimeVideoDirectory directory, QuickTimeContext context)
      {
          if (context.timeScale != null && entries.size() > 0) {
              float frameRate = (float)context.timeScale / (float)entries.get(0).sampleDuration;
              directory.setFloat(QuickTimeVideoDirectory.TAG_FRAME_RATE, frameRate);
          }
      }
  }
  