class PerformerBox extends AbstractFullBox {
    public static final String TYPE = "perf";

    private String language;
    private String performer;

    public PerformerBox() {
        super(TYPE);
    }

    public String getLanguage() {
        return language;
    }

    public void setLanguage(String language) {
        this.language = language;
    }

    public String getPerformer() {
        return performer;
    }

    public void setPerformer(String performer) {
        this.performer = performer;
    }

    protected long getContentSize() {
        return 6 + Utf8.utf8StringLengthInBytes(performer) + 1;
    }

    @Override
    protected void getContent(ByteBuffer byteBuffer) {
        writeVersionAndFlags(byteBuffer);
        IsoTypeWriter.writeIso639(byteBuffer, language);
        byteBuffer.put(Utf8.convert(performer));
        byteBuffer.put((byte) 0);
    }

    @Override
    public void _parseDetails(ByteBuffer content) {
        parseVersionAndFlags(content);
        language = IsoTypeReader.readIso639(content);
        performer = IsoTypeReader.readString(content);
    }

    public String toString() {<FILL_FUNCTION_BODY>}
}

        return "PerformerBox[language=" + getLanguage() + ";performer=" + getPerformer() + "]";
    
<methods>public int getFlags() ,public int getVersion() ,public void setFlags(int) ,public void setVersion(int) <variables>protected int flags,protected int version