I'm developing a server that transmit a streaming audio file(mainly mp3)on demand.I use RTP protocol and Java Media Framework in order to send the stream to the Client.

Now I should develop a component capable of reduce the bit rate of the audio file, while trasmitting it. I think to use a Processor receiveing a DataSource in Input(the audio stream) and trasmitting a DataSource in Output (the audio stream with the bit rate reduced), but I don't know how to develop such a Processor.Also because the bit rate is not always the same, but it changes.

Thank you in advance for any suggest.