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.mp4.media;
  
  import com.drew.lang.SequentialReader;
  import com.drew.lang.annotations.NotNull;
  import com.drew.metadata.Metadata;
  import com.drew.metadata.mp4.Mp4BoxTypes;
  import com.drew.metadata.mp4.Mp4Context;
  import com.drew.metadata.mp4.Mp4Dictionary;
  import com.drew.metadata.mp4.Mp4MediaHandler;
  
  import java.io.IOException;
  import java.util.ArrayList;
  
  public class Mp4VideoHandler extends Mp4MediaHandler<Mp4VideoDirectory>
  {
      public Mp4VideoHandler(Metadata metadata, Mp4Context context)
      {
          super(metadata, context);
      }
  
      @Override
      protected String getMediaInformation()
      {
          return Mp4BoxTypes.BOX_VIDEO_MEDIA_INFO;
      }
  
      @NotNull
      @Override
      protected Mp4VideoDirectory getDirectory()
      {
          return new Mp4VideoDirectory();
      }
  
      @Override
      public void processSampleDescription(@NotNull SequentialReader reader) throws IOException
      {
          // ISO/IED 14496-12:2015 pg.7
  
          reader.skip(4); // 1 byte header, 3 bytes flags
  
          // ISO/IED 14496-12:2015 pg.33
  
          long numberOfEntries = reader.getUInt32();
          long sampleDescriptionSize = reader.getUInt32();
          String format = reader.getString(4);
          reader.skip(6); // Reserved
          int dataReferenceIndex = reader.getUInt16();
  
          // ISO/IED 14496-12:2015 pg.156
  
          int version = reader.getInt16();
          int revisionLevel = reader.getInt16();
          String vendor = reader.getString(4);
          int temporalQuality = reader.getInt32();
          int spatialQuality = reader.getInt32();
          int width = reader.getUInt16();
          int height = reader.getUInt16();
          long horizresolution = reader.getUInt32();
          long vertresolution = reader.getUInt32();
          reader.skip(4); // Reserved
          int frameCount = reader.getUInt16();
          String compressorname = reader.getString(32);
          int depth = reader.getUInt16();
          reader.skip(2); // Pre-defined
  
          // TODO review this
          Mp4Dictionary.setLookup(Mp4VideoDirectory.TAG_COMPRESSION_TYPE, format, directory);
  
          directory.setInt(Mp4VideoDirectory.TAG_WIDTH, width);
          directory.setInt(Mp4VideoDirectory.TAG_HEIGHT, height);
  
          String compressorName = compressorname.trim();
          if (!compressorName.isEmpty()) {
              directory.setString(Mp4VideoDirectory.TAG_COMPRESSOR_NAME, compressorName);
          }
  
          directory.setInt(Mp4VideoDirectory.TAG_DEPTH, depth);
  
          // Calculate horizontal res
          double horizontalInteger = (horizresolution & 0xFFFF0000) >> 16;
          double horizontalFraction = (horizresolution & 0xFFFF) / Math.pow(2, 4);
          directory.setDouble(Mp4VideoDirectory.TAG_HORIZONTAL_RESOLUTION, horizontalInteger + horizontalFraction);
  
          double verticalInteger = (vertresolution & 0xFFFF0000) >> 16;
          double verticalFraction = (vertresolution & 0xFFFF) / Math.pow(2, 4);
          directory.setDouble(Mp4VideoDirectory.TAG_VERTICAL_RESOLUTION, verticalInteger + verticalFraction);
      }
  
      @Override
      public void processMediaInformation(@NotNull SequentialReader reader) throws IOException
      {
          // ISO/IED 14496-12:2015 pg.7
  
          reader.skip(4); // 1 byte header, 3 bytes flags
  
          // ISO/IED 14496-12:2015 pg.155
  
          int graphicsMode = reader.getUInt16();
          int[] opcolor = new int[]{reader.getUInt16(), reader.getUInt16(), reader.getUInt16()};
  
          directory.setIntArray(Mp4VideoDirectory.TAG_OPCOLOR, opcolor);
          directory.setInt(Mp4VideoDirectory.TAG_GRAPHICS_MODE, graphicsMode);
      }
  
      @Override
      public void processTimeToSample(@NotNull SequentialReader reader, Mp4Context context) throws IOException
      {
          // ISO/IED 14496-12:2015 pg.7
  
          reader.skip(4); // 1 byte header, 3 bytes flags
  
          // ISO/IED 14496-12:2015 pg.37
  
          float sampleCount = 0;
  
          long entryCount = reader.getUInt32();
  
          for (int i = 0; i < entryCount; i++) {
              sampleCount += reader.getUInt32();
              reader.skip(4); // sample delta
          }
  
          if (context.timeScale != null && context.duration != null) {
              float frameRate = (float)context.timeScale / ((float)context.duration / sampleCount);
              directory.setFloat(Mp4VideoDirectory.TAG_FRAME_RATE, frameRate);
          }
      }
  }
  