From: Clemens Ladisch <clemens@ladisch.de>
To: 6275 kson <6275.kson@gmail.com>
Cc: alsa-devel@alsa-project.org
Subject: Re: USB Audio device syncpipe error
Date: Fri, 10 Sep 2010 09:01:32 +0200 [thread overview]
Message-ID: <4C89D7CC.3070605@ladisch.de> (raw)
In-Reply-To: <AANLkTimzCNquUNQapdo4afcwtBYYVHGPH9U-J1xXHqXE@mail.gmail.com>
6275 kson wrote:
> Well I basically understand what is wrong. Usbaudio is expecting the packet
> size to be 4 and the value to be encoded as 16.16 because the device is
> operating at high speed. I made the change and my device now shows up
> properly as an output device and playback works but the feedback polling
> interval is incorrect.
What interval do you expect in this situation, and what interval do you
actually get?
> Since the feedback endpoint descriptor is not class specific I can see why
> one would expect it to be a usb 2.0 standard endpoint descriptor,
Yes, the UAC 1.0 spec cannot override the USB spec in this regard.
> however, that would mean I should also change my other audio
> streaming endpoint descriptors.
Which other descriptors? AFAICS, the only other thing that is affected
by high-speed is the packet size and format of the sync endpoint.
Regards,
Clemens
next prev parent reply other threads:[~2010-09-10 7:01 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-08 19:25 USB Audio device syncpipe error 6275 kson
2010-09-08 19:40 ` 6275 kson
2010-09-09 2:25 ` Daniel Mack
2010-09-09 7:50 ` Clemens Ladisch
[not found] ` <AANLkTingHyn2wyJ50uH9GpjnTg_YsL6Q0gzDoVyArvgv@mail.gmail.com>
2010-09-09 21:51 ` 6275 kson
2010-09-10 6:21 ` Daniel Mack
2010-09-10 7:01 ` Clemens Ladisch [this message]
2010-09-13 14:42 ` Alex Lee
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