Karsten Wiese wrote:
We can also vary the exact USB frame time.
With UHCI 1.1 USB Hosts there is the SOF Register.
...
It really works here already with the us428: The trick is:
We first make the USB-Frame longer until we capture 1 Sample Frame more 45
(for 44100). then the USB-Frame is
Clemens Ladisch wrote:
Jaroslav Kysela wrote:
I don't know much about USB 2.0,
Not too much differences for the driver.
Well, I should have read the specification before saying such things.
The format of synchronization information has changed, too; it's not
10.14 bits but 12.13 packed
Jaroslav Kysela wrote:
On Tue, 9 Mar 2004, Takashi Iwai wrote:
BTW, the USB audio is another headache. the current ALSA PCM model isn't
perfectly suitable for the devices like USB audio.
Unfortunately I don't see a better model.
Conceptually, USB devices have variable-sized periods. The
On Wed, 10 Mar 2004, Clemens Ladisch wrote:
Jaroslav Kysela wrote:
On Tue, 9 Mar 2004, Takashi Iwai wrote:
BTW, the USB audio is another headache. the current ALSA PCM model isn't
perfectly suitable for the devices like USB audio.
Unfortunately I don't see a better model.
Jaroslav Kysela wrote:
On Wed, 10 Mar 2004, Clemens Ladisch wrote:
Conceptually, USB devices have variable-sized periods. The question
is whether we actually want to allow this in the API. Probably not.
What this does mean? I though that the period size is specified with time
(1ms) for
At Wed, 10 Mar 2004 10:08:26 +0100 (CET),
Jaroslav wrote:
On Wed, 10 Mar 2004, Clemens Ladisch wrote:
Jaroslav Kysela wrote:
On Tue, 9 Mar 2004, Takashi Iwai wrote:
BTW, the USB audio is another headache. the current ALSA PCM model isn't
perfectly suitable for the devices
At Wed, 10 Mar 2004 09:26:27 +0100 (MET),
Clemens Ladisch wrote:
I don't know much about USB 2.0,
Not too much differences for the driver. The main difference is that
there are now 8000 microframes per second. I have written a patch
(see below) and am about to test it.
is there any
Takashi Iwai wrote:
Clemens Ladisch wrote:
I don't know much about USB 2.0,
Not too much differences for the driver. The main difference is that
there are now 8000 microframes per second. I have written a patch
(see below) and am about to test it.
is there any real usb2-audio
We can also vary the exact USB frame time.
With UHCI 1.1 USB Hosts there is the SOF Register.
It is setable from 0 to 255, the default being 127.
Using this SOF-Register, we can set the actual USB Frame Rate from
((12000 - 127) / 12000)ms to ((12000 + 128) / 12000)ms. That is about -/+ 1%:
More
Karsten Wiese wrote:
We can also vary the exact USB frame time.
With UHCI 1.1 USB Hosts there is the SOF Register.
It is setable from 0 to 255, the default being 127.
Using this SOF-Register, we can set the actual USB Frame Rate from
((12000 - 127) / 12000)ms to ((12000 + 128) / 12000)ms. That
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