ClassCastException while creating sendstream

Question

Hi,
I'm trying to establish an unicast rtp session and play an url to the remote client.
DataSource[] sources = new DataSource[urls.length];
          for(int i = 0; i < urls.length; i++) {
               sources[i] = Manager.createDataSource(urls);
          DataSource mergedDataSource = Manager.createMergingDataSource(sources);
          SendStream sendStream = m_rtpManager.createSendStream(mergedDataSource, 1);
          sendStream.start();
I throws ClassCastException while creating the sendstream object.
java.lang.ClassCastException
     at com.sun.media.rtp.RTPSessionMgr.createSendStream(RTPSessionMgr.java:1098)
     at com.sun.media.rtp.RTPSessionMgr.createSendStream(RTPSessionMgr.java:1262)
     at com.untd.apps.ms.rtp.session.RtpSession.play(RtpSession.java:85)
     at com.untd.apps.ms.action.HandleAnncCommand.execute(HandleAnncCommand.java:44)
I decompiled the RtpSessionMgr class and here are the few lines of the createSendStream method
/** RtpSessionMgr class **/
public SendStream createSendStream(int ssrc, javax.media.protocol.DataSource ds, int streamindex)
throws UnsupportedFormatException, IOException, SSRCInUseException
SSRCInfo i = cache.lookup(ssrc);
if(i != null)
throw new SSRCInUseException("SSRC supplied is already in use");
int newSSRC = ssrc;
if(cache.rtcp_bw_fraction == 0.0D)
throw new IOException("Initialized with zero RTP/RTCP outgoing bandwidth. Cannot create a sending stream ");
PushBufferStream streams[] = ((PushBufferDataSource)ds).getStreams();
PushBufferStream sendstream = streams[streamindex];
The datsource that I use is PullDataSource (In the api, it is mentioned that we can pass both push and pullDatasources to this method).
By default the Datasource for http protocol is an instance of PullDataSource. But in the createSendStream method, the dataSource is casted to PushDataSource. I guess this is why it throws ClassCastException.
Could someone please help me resolve this error.
Thanks,
Ganesh.

Answer 1

Never mind. Resolved the issue myself.
By setting the audio formats using processor, I resolved the issue. The datasource from processor.getDataOutput() is a PushDataSource.