[I posted this to the user list with no response; perhaps it was too technical.]
I'm having trouble getting implicit feedback working with my custom capture/playback USB audio class device, even with the latest kernel. I presume it's a problem with my device's configuration, but can't figure out exactly what the problem is (after a whole lotta investigation).
Specifically, my device captures an AES/EBU data stream (at a frame rate dictated by an external device), sends it to the computer via USB and ALSA, and then takes a processed audio stream from the computer via ALSA and USB, and sends it out at the same frame rate. The output stream should have the exact same frame rate as the input stream, governed by implicit feedback.
I understand that only recently has ALSA included support for implicit feedback. I'm running with kernel 3.6.6, which I believe includes the support, but still can't get it working. I'd really love to see something functioning in this mode so I can determine where the problem is.
Is there any commercial USB hardware out there that supports implicit feedback? I assume the ALSA developers are testing against something, but I can't find anything appropriate.
Or, is there source available that runs on some USB-capable micro board that supports it?
Thanks, Dan