Set send packet size to 10ms

Question

how to set the audio packet size equivalent to 10 ms ?
Current sample application sends 480 bytes RTP packect and I want it to be 80 bytes. can i set so somehow for G711 Ulaw?
Thanks!!!
Edited by: sahaj on Nov 11, 2009 12:26 PM

Answer 1

sahaj wrote:
Thanks ...i read it even before...just thought may be some simple way is available.Yes - this required a little digging around to find out :-) From memory I think the link above does not include an example of how you actually do it.
Look at the code for the Sun audio transmit example (AVTransmit2.java) and find this code snippet from the createProcessor() method:
             Format format = tracks[0].getFormat();
              if (tracks[0].isEnabled())
                   Format supported[] = tracks[0].getSupportedFormats();                                           
                   tracks[0].setFormat(supported[5]);
              else
                   tracks[0].setEnabled(false);  To change the default packet size you need to explicitly specify the uLaw codec chain and change the packetSize property along the way. So the code above now becomes:
              Format format = tracks[0].getFormat();
              if (tracks[0].isEnabled())
                   Format supported[] = tracks[0].getSupportedFormats();                                           
                   tracks[0].setFormat(supported[5]);
                   RCModule rcm = new com.ibm.media.codec.audio.rc.RCModule();
                   JavaEncoder je = new com.ibm.media.codec.audio.ulaw.JavaEncoder();
                   Packetizer p = new com.sun.media.codec.audio.ulaw.Packetizer();
                   p.setPacketSize(80);
                   tracks[0].setCodecChain(new Codec[] {rcm,je,p});
              else
                   tracks[0].setEnabled(false);         You have to create the rate converter (RCModule), the encoder (JavaEncoder) and the packetizer (Packetizer), set the packetizer's packetSize to the desired amount and specifiy the codec chain for the track. A packet size of 80 will give you 10ms.
Hope this helps.
KevB