[linux-audio-user] MAudio Quattro help

Jim Steed jsteed at gedae.com
Fri Mar 23 15:41:27 EDT 2007


I'm trying to use all 4 input channels on a MAudio Quattro on Fedora
Core 5 running on a Playstation 3 (PPC build of the kernel with some
stuff stripped out).

The final app will just use open() and read() to process the data
directly.  In that application it looks like I get 2 copies of the
first 2 channels.  I get Channel 0 replicated in Channel 2 with
exactly the same values, and Channel 1 replicated in Channel 3.
(Recording 16 bit at 44.1kHz)

I followed the directions in
http://wiki.linuxquestions.org/wiki/M-Audio_Quattro to setup
.asoundrc.  I am trying to debug using just arecord but I can't get it
to do anything

arecord -r 44100 -c 4 -f s16_le -D q4 -d 5 test4.wav

gives me

arecord: xrun:1082: read/write error, state = PREPARED

Any help would be appreciated.

Thanks,
Jim Steed

Here is the relevant part of /proc/bus/usb/devices:

T:  Bus=01 Lev=02 Prnt=02 Port=01 Cnt=02 Dev#=  4 Spd=12  MxCh= 0
D:  Ver= 1.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs=  1
P:  Vendor=0763 ProdID=2001 Rev= 1.05
S:  Manufacturer=M Audio
S:  Product=USB Audio Quattro
C:* #Ifs=10 Cfg#= 1 Atr=40 MxPwr=  0mA
I:  If#= 0 Alt= 0 #EPs= 0 Cls=01(audio) Sub=01 Prot=00 Driver=snd-usb-audio
I:  If#= 1 Alt= 0 #EPs= 0 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio
I:  If#= 1 Alt= 4 #EPs= 1 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio
E:  Ad=03(O) Atr=09(Isoc) MxPS= 192 Ivl=1ms
I:  If#= 2 Alt= 0 #EPs= 0 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio
I:  If#= 2 Alt= 4 #EPs= 1 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio
E:  Ad=85(I) Atr=0d(Isoc) MxPS= 192 Ivl=1ms
I:  If#= 3 Alt= 0 #EPs= 0 Cls=01(audio) Sub=01 Prot=00 Driver=snd-usb-audio
I:  If#= 4 Alt= 0 #EPs= 0 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio
I:  If#= 4 Alt= 1 #EPs= 1 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio
E:  Ad=03(O) Atr=09(Isoc) MxPS= 576 Ivl=1ms
I:  If#= 4 Alt= 3 #EPs= 1 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio
E:  Ad=03(O) Atr=09(Isoc) MxPS= 288 Ivl=1ms
I:  If#= 4 Alt= 4 #EPs= 1 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio
E:  Ad=03(O) Atr=09(Isoc) MxPS= 192 Ivl=1ms
I:  If#= 5 Alt= 0 #EPs= 0 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio
I:  If#= 5 Alt= 1 #EPs= 1 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio
E:  Ad=85(I) Atr=0d(Isoc) MxPS= 576 Ivl=1ms
I:  If#= 5 Alt= 3 #EPs= 1 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio
E:  Ad=85(I) Atr=0d(Isoc) MxPS= 288 Ivl=1ms
I:  If#= 5 Alt= 4 #EPs= 1 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio
E:  Ad=85(I) Atr=0d(Isoc) MxPS= 192 Ivl=1ms
I:  If#= 6 Alt= 0 #EPs= 0 Cls=01(audio) Sub=01 Prot=00 Driver=snd-usb-audio
I:  If#= 7 Alt= 0 #EPs= 0 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio
I:  If#= 7 Alt= 1 #EPs= 1 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio
E:  Ad=04(O) Atr=09(Isoc) MxPS= 576 Ivl=1ms
I:  If#= 7 Alt= 3 #EPs= 1 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio
E:  Ad=04(O) Atr=09(Isoc) MxPS= 288 Ivl=1ms
I:  If#= 7 Alt= 4 #EPs= 1 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio
E:  Ad=04(O) Atr=09(Isoc) MxPS= 192 Ivl=1ms
I:  If#= 8 Alt= 0 #EPs= 0 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio
I:  If#= 8 Alt= 1 #EPs= 1 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio
E:  Ad=86(I) Atr=0d(Isoc) MxPS= 576 Ivl=1ms
I:  If#= 8 Alt= 3 #EPs= 1 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio
E:  Ad=86(I) Atr=0d(Isoc) MxPS= 288 Ivl=1ms
I:  If#= 8 Alt= 4 #EPs= 1 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio
E:  Ad=86(I) Atr=0d(Isoc) MxPS= 192 Ivl=1ms
I:  If#= 9 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=snd-usb-audio
E:  Ad=81(I) Atr=03(Int.) MxPS=  32 Ivl=1ms
E:  Ad=82(I) Atr=02(Bulk) MxPS=  32 Ivl=0ms
E:  Ad=02(O) Atr=02(Bulk) MxPS=  32 Ivl=0ms



More information about the Linux-audio-user mailing list