Mp4StsdBox.java

package org.jaudiotagger.audio.mp4.atom;

import org.jaudiotagger.audio.exceptions.CannotReadException;

import java.nio.ByteBuffer;

/**
 * StsdBox ( sample (frame encoding) description box)
 * <p/>
 * <p>4 bytes version/flags = byte hex version + 24-bit hex flags
 * (current = 0)
 * - > 4 bytes number of descriptions = long unsigned total
 * (default = 1)
 * Then if audio contains mp4a,alac or drms box
 */
public class Mp4StsdBox extends AbstractMp4Box {
    public static final int VERSION_FLAG_POS = 0;
    public static final int OTHER_FLAG_POS = 1;
    public static final int NO_OF_DESCRIPTIONS_POS = 4;

    public static final int VERSION_FLAG_LENGTH = 1;
    public static final int OTHER_FLAG_LENGTH = 3;
    public static final int NO_OF_DESCRIPTIONS_POS_LENGTH = 4;
    private int entryCount;

    /**
     * @param header     header info
     * @param dataBuffer data of box (doesnt include header data)
     */
    public Mp4StsdBox(Mp4BoxHeader header, ByteBuffer dataBuffer) {
        this.header = header;
        this.dataBuffer = dataBuffer;
    }

    public void processData() throws CannotReadException {
        //Skip the data
//        dataBuffer.position(dataBuffer.position() + VERSION_FLAG_LENGTH + OTHER_FLAG_LENGTH + NO_OF_DESCRIPTIONS_POS_LENGTH);
        int flags = dataBuffer.getInt();
        entryCount = dataBuffer.getInt();
    }
}