So, I've looked into this today and as expected, the device normally operates in implicit feedback mode. After installing a proprietary driver on Mac OS X (that regularily crashed my kernel), the analyzer shows that for every inbound packet, an out packet is sent back with the same amount of data in it. And there are no feedback endpoints.
On Tue, Jun 14, 2011 at 11:21 AM, Aurélien Leblond blablack@gmail.com wrote:
There are still the issue of samples dropping.
Tto reproduce it:
- Open Audacity and set it up to be using Jack.
- Click Generate -> Tone -> Ok.
"Normally" you should hear very regular pops...
What surprises me though, is that I can't hear the clicks and pops you guys describe. Instead, I hear a quite annoying distortion for both 44100 and 48000 Hz which I can't explain either. My spontanous guess is that there is a resampler in the chain which compensates the sample drift and notably reduces the audio quality.
I patched the driver so that it supports implicit feedback, but that didn't change anything in that regard.
Hence my question is: How do you guys test? I renderened a sine tone in different samplerates and bit depths to .wav files and play them with aplay (no pulseaudio or anything in the chain). Could you try the same and report what happens?
Daniel