MJSIP和编解码器接口

Question

使用Mjsip作为我的softphone项目的sip堆栈。有类RtpSender.java有Method

public RtpSender(OutputStream output_stream, boolean do_sync, SIPCodec sipCodec, DatagramSocket src_socket, String dest_addr, int dest_port )
    {
        init( output_stream, do_sync, sipCodec, src_socket, dest_addr, dest_port );
    }

在另一个文件AudioSender.java（这是一个纯java音频流发送者）我使用RtpSender方法如下...

sender=new RtpSender(audio_input_stream,true,**SIPCodec**,null,daddr,dport);

我的问题是SIPCodec，我有一个为编解码器命名的接口，我应该传递什么值？我应该怎样通过？我正在调用codecids，但显示方法对此不合适。这是编解码器接口......

public interface SIPCodec {
// Codec constants
public static String MEDIA_TYPE_AUDIO = "audio";
public static String MEDIA_TYPE_VIDEO = "video";
public static String ATTRIBUTE_PTIME = "ptime";
public static String ATTRIBUTE_RTPMAP = "rtpmap";
public static String ATTRIBUTE_FMTP = "fmtp";
public static String ATTRIBUTE_AS = "AS";
public static int DEFAULT_PACKETIZATION = 20;
public void encodeInit( int defaultEncodePacketization );
public void decodeInit( int defaultDecodePacketization );
...

这是codecs.java类，我将其称为单个编解码器。

public SIPCodec getSIPAudioCodec( int codecId ) {

        SIPCodec sipCodec;

        switch ( codecId ) {
            case audioCodecPCMU:
                sipCodec = new SIPCodecPCMU();
                break;
            case audioCodecPCMA:
                sipCodec = new SIPCodecPCMA();
                break;
            case audioCodecG729:
                sipCodec = new SIPCodecG729();
                break;
            case audioCodeciLBC:
                sipCodec = new SIPCodeciLBC();
                break;
            default:
                sipCodec = null;
        }