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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal>I noticed some years ago that there was a type of jitter buffer specifically for the USB channel, but it is disabled by default.<o:p></o:p></p><p class=MsoNormal>It can be of a fixed size or adaptive.<o:p></o:p></p><p class=MsoNormal>See the c code for the usbradio channel – snip follows:<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;font-family:"Courier New"'>;------------------------------ JITTER BUFFER CONFIGURATION --------------------------<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;font-family:"Courier New"'> ; jbenable = yes ; Enables the use of a jitterbuffer on the receiving side of an<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;font-family:"Courier New"'> ; USBRADIO channel. Defaults to "no". An enabled jitterbuffer will<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;font-family:"Courier New"'> ; be used only if the sending side can create and the receiving<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;font-family:"Courier New"'> ; side can not accept jitter. The USBRADIO channel can't accept jitter,<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;font-family:"Courier New"'> ; thus an enabled jitterbuffer on the receive USBRADIO side will always<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;font-family:"Courier New"'> ; be used if the sending side can create jitter.<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;font-family:"Courier New"'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;font-family:"Courier New"'> ; jbmaxsize = 200 ; Max length of the jitterbuffer in milliseconds.<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;font-family:"Courier New"'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;font-family:"Courier New"'> ; jbresyncthreshold = 1000 ; Jump in the frame timestamps over which the jitterbuffer is<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;font-family:"Courier New"'> ; resynchronized. Useful to improve the quality of the voice, with<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;font-family:"Courier New"'> ; big jumps in/broken timestamps, usualy sent from exotic devices<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;font-family:"Courier New"'> ; and programs. Defaults to 1000.<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;font-family:"Courier New"'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;font-family:"Courier New"'> ; jbimpl = fixed ; Jitterbuffer implementation, used on the receiving side of an USBRADIO<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;font-family:"Courier New"'> ; channel. Two implementations are currenlty available - "fixed"<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;font-family:"Courier New"'> ; (with size always equals to jbmax-size) and "adaptive" (with<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;font-family:"Courier New"'> ; variable size, actually the new jb of IAX2). Defaults to fixed.<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;font-family:"Courier New"'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;font-family:"Courier New"'> ; jblog = no ; Enables jitterbuffer frame logging. Defaults to "no".<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;font-family:"Courier New"'> ;-----------------------------------------------------------------------------------<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;font-family:"Courier New"'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;font-family:"Courier New"'>73<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;font-family:"Courier New"'>Ken<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;font-family:"Courier New"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt;font-family:"Courier New"'><o:p> </o:p></span></p></div></body></html>