Hi: I am thinking about adding spectrum feature to my softphone. Before I use FFT(Fast Fourier Transform), I must catch each audio frame before they are input to microphone or output to speaker. Are there any callback APIs or some other APIs in PJMedia I can use to get those input or output audio frames? Thanks Best Regards, Feng XueSong -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20080723/5de4657d/attachment.html