Re: [Alsa-user] Driver for M-Audio Transit USB from Midiman

[Bill U. <un...@ph...>]

On Mon, 26 Jan 2004, Clemens Ladisch wrote:

> Bill Unruh wrote:
> > I am not sure that you got my report that S24_BE works for both
> > recording and playing and for both 44100 and 96000 and for duplex
> > at 44100. S16 does not work.
> 
> Your tests were made with the default device, which is "plughw", which
> automatically converts sample formats.  I.e., when you play a S24_BE
> file, the data is byte-swapped by ALSA because the device claims it
> supports LE only.
> 
> Please do all your tests again ;-) with the "-D hw:0" parameter.

OK, Only S24_3LE works-- not S24_3BE or any of S24_{LE,BE} . 

If I have the data as  b3 b2 b1 b3 b2 b1 ....
(where b1 is the most significant bit-- the one that on its own will
create the sound as it should be--, b2 the next (if I put the b1 into
this position with zeros on either side, I get a very quiet version of
the sound-) and b1 the least significant, the sound comes out as it
should. Ie, it seems as though the bytes have to be fed in reversed.


> 
> Please note that S24_?E is 24 bits data packed into four bytes, while
> S24_3?E is 24 bits in three bytes.  USB devices support the latter
> only.
> 
> > I have also run sniffusb on the windows side as 0763:2806 comes up,
> > [...]
> > Does this mean that if I use fxload to do a one stage loading using this
> > file, that it might work?
> 
> Your effort is appreciated, but we already know that the Transit uses
> DFU to download its firmware.  (DFU is a specification published by
> the USB-IF.)  fxload is for EZ-USB chips, not for DFU-compatible ones.
> 
> I've written a DFU loader
> http://prdownloads.sourceforge.net/usb-midi-fw/madfu-firmware-0.1beta3.tar.gz?download
> which does the same as the Windows loader.  Unfortunately, it doesn't
> work because the 2.4 kernel gets confused when the device resets
> itself.
> 
> 
> Regards,
> Clemens
> 
> 
> 
> 
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-- 
William G. Unruh   |  Canadian Institute for|     Tel: +1(604)822-3273
Physics&Astronomy  |     Advanced Research  |     Fax: +1(604)822-5324
UBC, Vancouver,BC  |   Program in Cosmology |     un...@ph...
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