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This is a fork of com.drewnoakes' metadata-extractor that relocates com.adobe.internal to com.adobe. Java library for extracting EXIF, IPTC, XMP, ICC and other metadata from image and video files.
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/*
 * 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
 *
 *        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.
 *
 * More information about this project is available at:
 *
 *    https://drewnoakes.com/code/exif/
 *    https://github.com/drewnoakes/metadata-extractor
 */
package com.drew.metadata.mp4;

import com.drew.imaging.mp4.Mp4Handler;
import com.drew.lang.SequentialByteArrayReader;
import com.drew.lang.SequentialReader;
import com.drew.lang.annotations.NotNull;
import com.drew.lang.annotations.Nullable;
import com.drew.metadata.Metadata;
import com.drew.metadata.mp4.boxes.*;
import com.drew.metadata.mp4.media.Mp4UuidBoxHandler;

import java.io.IOException;

/**
 * @author Payton Garland
 */
public class Mp4BoxHandler extends Mp4Handler
{
    private Mp4HandlerFactory handlerFactory = new Mp4HandlerFactory(this);

    public Mp4BoxHandler(Metadata metadata)
    {
        super(metadata);
    }

    @NotNull
    @Override
    protected Mp4Directory getDirectory()
    {
        return new Mp4Directory();
    }

    @Override
    public boolean shouldAcceptBox(@NotNull Box box)
    {
        return box.type.equals(Mp4BoxTypes.BOX_FILE_TYPE)
            || box.type.equals(Mp4BoxTypes.BOX_MOVIE_HEADER)
            || box.type.equals(Mp4BoxTypes.BOX_HANDLER)
            || box.type.equals(Mp4BoxTypes.BOX_MEDIA_HEADER)
            || box.type.equals(Mp4BoxTypes.BOX_TRACK_HEADER)
            || box.type.equals(Mp4BoxTypes.BOX_USER_DATA)
            || box.type.equals(Mp4BoxTypes.BOX_USER_DEFINED);
    }

    @Override
    public boolean shouldAcceptContainer(@NotNull Box box)
    {
        return box.type.equals(Mp4ContainerTypes.BOX_TRACK)
            || box.type.equals(Mp4ContainerTypes.BOX_METADATA)
            || box.type.equals(Mp4ContainerTypes.BOX_MOVIE)
            || box.type.equals(Mp4ContainerTypes.BOX_MEDIA);
    }

    @Override
    public Mp4Handler processBox(@NotNull Box box, @Nullable byte[] payload, Mp4Context context) throws IOException
    {
        if (payload != null) {
            SequentialReader reader = new SequentialByteArrayReader(payload);
            if (box.type.equals(Mp4BoxTypes.BOX_MOVIE_HEADER)) {
                processMovieHeader(reader, box);
            } else if (box.type.equals(Mp4BoxTypes.BOX_FILE_TYPE)) {
                processFileType(reader, box);
            } else if (box.type.equals(Mp4BoxTypes.BOX_HANDLER)) {
                HandlerBox handlerBox = new HandlerBox(reader, box);
                return handlerFactory.getHandler(handlerBox, metadata, context);
            } else if (box.type.equals(Mp4BoxTypes.BOX_MEDIA_HEADER)) {
                processMediaHeader(reader, box, context);
            } else if (box.type.equals(Mp4BoxTypes.BOX_TRACK_HEADER)) {
                processTrackHeader(reader, box);
            } else if (box.type.equals(Mp4BoxTypes.BOX_USER_DEFINED)) {
                Mp4UuidBoxHandler userBoxHandler = new Mp4UuidBoxHandler(metadata);
                userBoxHandler.processBox(box, payload, context);
            } else if (box.type.equals(Mp4BoxTypes.BOX_USER_DATA)) {
                processUserData(box, reader, payload.length);
            }
        } else {
            if (box.type.equals(Mp4ContainerTypes.BOX_COMPRESSED_MOVIE)) {
                directory.addError("Compressed MP4 movies not supported");
            }
        }
        return this;
    }

    private void processUserData(@NotNull Box box, @NotNull SequentialReader reader, int length) throws IOException
    {
        new UserDataBox(reader, box, length).addMetadata(directory);
    }

    private void processFileType(@NotNull SequentialReader reader, @NotNull Box box) throws IOException
    {
        FileTypeBox fileTypeBox = new FileTypeBox(reader, box);
        fileTypeBox.addMetadata(directory);
    }

    private void processMovieHeader(@NotNull SequentialReader reader, @NotNull Box box) throws IOException
    {
        MovieHeaderBox movieHeaderBox = new MovieHeaderBox(reader, box);
        movieHeaderBox.addMetadata(directory);
    }

    private void processMediaHeader(@NotNull SequentialReader reader, @NotNull Box box, Mp4Context context) throws IOException
    {
        new MediaHeaderBox(reader, box, context);
    }

    private void processTrackHeader(@NotNull SequentialReader reader, @NotNull Box box) throws IOException
    {
        TrackHeaderBox trackHeaderBox = new TrackHeaderBox(reader, box);
        trackHeaderBox.addMetadata(directory);
    }
}