PortMixer.java 文件源码

public int getMaxLines(Line.Info info) {
    Line.Info fullInfo = getLineInfo(info);

    // if it's not supported at all, return 0.
    if (fullInfo == null) {
        return 0;
    }

    if (fullInfo instanceof Port.Info) {
        //return AudioSystem.NOT_SPECIFIED; // if several instances of PortMixerPort
        return 1;
    }
    return 0;
}