Charles Chen wrote:
Roger,
Follwoing your suggestions, I did more investigations on the jitters,
and I found in each 200 bytes that I received, there are 24 bytes
zero. I used my endpoint' wMaxPacketSize(200 bytes) to set irp, so it
seems data are lost between irps. Also I tried on windows and the
recorded curves are smooth.
Here are some outputs. Can you see what problem might be? I really
appreciate your help.
Can you send the data for 100 IRPS or so, on format:
20, 50 ,70, 100, -120, -90 ....
...irp 2...
...irp n...
I really don't see why there would be hitter between IRPs unless it is
between the group of IRPs. Each group of IRPs are handled by the kernel
and is not interferred with by the java code.
Some more thoughts:
Are you setting the length back to 0?
(could there be an issue with the length setting in javax.usb, try zero
out the array before resubmitting).
Should the stream just contain the audio, or are there packet headers
etc? (there is in my video stream).
Have you tried logging the data sent in Windows? I think there are free
loggers available that should be able to trace the data sent and
received. (look here http://www.linux-usb.org/tools.html ).
I'll not be available for a couple of weeks, Am getting married this
Saturday and then away on some holliday.
//Roger Lindsjö
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