[ALSA - driver 0000955]: CN-126 - USB 5.1 Audio adapter

[ALSA - driver 0000955]: CN-126 - USB 5.1 Audio adapter

[Fruhwirth Clemens]

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My USB audio class device doesn't show all mixer controls in ALSA.
For reference, for other users searching this archive, it's a "Creative
USB Sound Blaster Live! 24-bit External". 
(http://creative.com/products/product.asp?category=1&subcategory=206&product=10702&nav=2)

I have added some inspection code to usb-mixer.c, which basically dumps
all class specific USB interface descriptors. 

My card got 2 x OUTPUT_TERMINAL, 2 x INPUT_TERMINAL, 2 x FEATURE_UNIT
for the AudioControl class. But this doesn't make me any wiser.

I wonder why the snd_usb_create_mixer code does only loop over the
OUTPUT_TERMINAL class, even there is support code for all other types in
the parse_audio_unit code, which is called subsequently by
snd_usb_create_mixer.

My aim is to have controls available for the Line-in mixer, both for
recording and for direct re-mixing into the Main Out Plug.

Is there a developer owning such a box, or anyone who can guess what I'm
supposed to do with the additional AudioControl class controls? 

Are there any tools that helps inspecting the USB device, or further
dumping of class-specific content and/or inspection of the USB
flow between a vmware hosted windows system and the linux host system?

Thanks,

What's the reason why Bug#995 is not available to the public? I'm
getting access denied. Otherwise I would have put this message into the
bugtracker.
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Re: [ALSA - driver 0000955]: CN-126 - USB 5.1 Audio adapter

[Jaroslav Kysela]

On Thu, 3 Mar 2005, Fruhwirth Clemens wrote:

> What's the reason why Bug#955 is not available to the public? I'm
> getting access denied. Otherwise I would have put this message into the
> bugtracker.

Because some bug-reporters don't understand the public/private difference.
It's public now.

						Jaroslav

-----
Jaroslav Kysela <perex@suse.cz>
Linux Kernel Sound Maintainer
ALSA Project, SUSE Labs


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Re: [ALSA - driver 0000955]: CN-126 - USB 5.1 Audio adapter

[Clemens Ladisch]

Fruhwirth Clemens wrote:
> My USB audio class device doesn't show all mixer controls in ALSA.
> For reference, for other users searching this archive, it's a "Creative
> USB Sound Blaster Live! 24-bit External".
> ...
> I wonder why the snd_usb_create_mixer code does only loop over the
> OUTPUT_TERMINAL class,

Because all other units are (indirectly) connected to an output
terminal.  We get them when we recursively inspect the respective
source units.

> My aim is to have controls available for the Line-in mixer, both for
> recording and for direct re-mixing into the Main Out Plug.

Your device probably doesn't have such controls.  What is the output
of "lsusb -v" for it?


Clemens



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Re: [ALSA - driver 0000955]: CN-126 - USB 5.1 Audio adapter

[Fruhwirth Clemens]

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On Thu, 2005-03-03 at 12:35 +0100, Clemens Ladisch wrote:
> Fruhwirth Clemens wrote:
> > My USB audio class device doesn't show all mixer controls in ALSA.
> > For reference, for other users searching this archive, it's a "Creative
> > USB Sound Blaster Live! 24-bit External".
> > ...
> > I wonder why the snd_usb_create_mixer code does only loop over the
> > OUTPUT_TERMINAL class,
> 
> Because all other units are (indirectly) connected to an output
> terminal.  We get them when we recursively inspect the respective
> source units.
> 
> > My aim is to have controls available for the Line-in mixer, both for
> > recording and for direct re-mixing into the Main Out Plug.
> 
> Your device probably doesn't have such controls.  What is the output
> of "lsusb -v" for it?

lsusb fails :/

Bus 003 Device 002: ID 041e:3040 Creative Technology, Ltd
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               1.10
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0
  bDeviceProtocol         0
  bMaxPacketSize0         8
  idVendor           0x041e Creative Technology, Ltd
  idProduct          0x3040
  bcdDevice            1.00
  iManufacturer           1 Creative Technology
  iProduct                2 SB Live! 24-bit External
  iSerial                 0
  bNumConfigurations      1
cannot get config descriptor 0, Connection timed out (110)
  Language IDs: (length=4)
     0409 English(US)

I wonder what's the cause. Has Creative delivered a non-standard
compliant device one more time? The original EMU10K1 was also FUBAR wrt
to the PCI standard.

The kernel log is full of

Mar  3 16:17:01 ghanima kernel: usb 3-1: usbfs: USBDEVFS_CONTROL failed cmd lsusb rqt 128 rq 6 len 979 ret -110
Mar  3 16:17:01 ghanima kernel: usb 3-1: lsusb timed out on ep0in

The device is connected to an UHCI hosted bus.. Linus' bitkeeper doesn't
show any relevant bug fixes in this area in the last few month.. Hmm any
ideas?

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Re: SB Live 24 Ext (was: [ALSA - driver 0000955]: CN-126 - USB 5.1 Audio adapter)

[Clemens Ladisch]

Fruhwirth Clemens wrote:
> On Thu, 2005-03-03 at 12:35 +0100, Clemens Ladisch wrote:
> > Your device probably doesn't have such controls.  What is the output
> > of "lsusb -v" for it?
>
> lsusb fails :/
>
> Bus 003 Device 002: ID 041e:3040 Creative Technology, Ltd
> Device Descriptor:
> ...
>   bNumConfigurations      1
> cannot get config descriptor 0, Connection timed out (110)

The kernel managed to read the descriptors, otherwise snd-usb-audio
wouldn't have loaded.  You might try to install a newer version of
usbutils.

Well.  What is the output of "xxd -g1 /proc/bus/usb/003/002" (where
003 and 002 are the bus and device numbers)?


Clemens



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Re: SB Live 24 Ext (was: [ALSA - driver 0000955]: CN-126 - USB 5.1 Audio adapter)

[Fruhwirth Clemens]

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On Fri, 2005-03-04 at 09:31 +0100, Clemens Ladisch wrote:
> Fruhwirth Clemens wrote:
> > On Thu, 2005-03-03 at 12:35 +0100, Clemens Ladisch wrote:
> > > Your device probably doesn't have such controls.  What is the output
> > > of "lsusb -v" for it?
> >
> > lsusb fails :/
> >
> > Bus 003 Device 002: ID 041e:3040 Creative Technology, Ltd
> > Device Descriptor:
> > ...
> >   bNumConfigurations      1
> > cannot get config descriptor 0, Connection timed out (110)
> 
> The kernel managed to read the descriptors, otherwise snd-usb-audio
> wouldn't have loaded.  You might try to install a newer version of
> usbutils.

I already did that (at least I thought) but obviously Gentoo hasn't
bumped the version from 0.11 to 0.70 yet. 

Here is the lsusb (0.70) output. I removed the streaming interface
information, because this creative thing has a ton of them, full output
at http://clemens.endorphin.org/usblive-interfaces .

Bus 003 Device 002: ID 041e:3040 Creative Technology, Ltd 
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               1.10
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0         8
  idVendor           0x041e Creative Technology, Ltd
  idProduct          0x3040 
  bcdDevice            1.00
  iManufacturer           1 Creative Technology
  iProduct                2 SB Live! 24-bit External
  iSerial                 0 
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength          979
    bNumInterfaces          3
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0x80
    MaxPower              308mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         1 Audio
      bInterfaceSubClass      1 Control Device
      bInterfaceProtocol      0 
      iInterface              0 
      AudioControl Interface Descriptor:
        bLength                10
        bDescriptorType        36
        bDescriptorSubtype      1 (HEADER)
        bcdADC               1.00
        wTotalLength           76
        bInCollection           2
        baInterfaceNr( 0)       1
        baInterfaceNr( 1)       2
      AudioControl Interface Descriptor:
        bLength                12
        bDescriptorType        36
        bDescriptorSubtype      2 (INPUT_TERMINAL)
        bTerminalID             1
        wTerminalType      0x0101 USB Streaming
        bAssocTerminal          0
        bNrChannels             6
        wChannelConfig     0x003f
          Left Front (L)
          Right Front (R)
          Center Front (C)
          Low Freqency Enhancement (LFE)
          Left Surround (LS)
          Right Surround (RS)
        iChannelNames           0 
        iTerminal               0 
      AudioControl Interface Descriptor:
        bLength                14
        bDescriptorType        36
        bDescriptorSubtype      6 (FEATURE_UNIT)
        bUnitID                 2
        bSourceID               1
        bControlSize            1
        bmaControls( 0)      0x03
          Mute
          Volume
        bmaControls( 1)      0x00
        bmaControls( 2)      0x00
        bmaControls( 3)      0x00
        bmaControls( 4)      0x00
        bmaControls( 5)      0x00
        bmaControls( 6)      0x00
        iFeature                0 
      AudioControl Interface Descriptor:
        bLength                 9
        bDescriptorType        36
        bDescriptorSubtype      3 (OUTPUT_TERMINAL)
        bTerminalID             3
        wTerminalType      0x0301 Speaker
        bAssocTerminal          0
        bSourceID               2
        iTerminal               0 
      AudioControl Interface Descriptor:
        bLength                12
        bDescriptorType        36
        bDescriptorSubtype      2 (INPUT_TERMINAL)
        bTerminalID             4
        wTerminalType      0x0603 Line Connector
        bAssocTerminal          0
        bNrChannels             2
        wChannelConfig     0x0003
          Left Front (L)
          Right Front (R)
        iChannelNames           0 
        iTerminal               0 
      AudioControl Interface Descriptor:
        bLength                10
        bDescriptorType        36
        bDescriptorSubtype      6 (FEATURE_UNIT)
        bUnitID                 5
        bSourceID               4
        bControlSize            1
        bmaControls( 0)      0x02
          Volume
        bmaControls( 1)      0x00
        bmaControls( 2)      0x00
        iFeature                0 
      AudioControl Interface Descriptor:
        bLength                 9
        bDescriptorType        36
        bDescriptorSubtype      3 (OUTPUT_TERMINAL)
        bTerminalID             6
        wTerminalType      0x0101 USB Streaming
        bAssocTerminal          0
        bSourceID               5
        iTerminal               0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0008  1x 8 bytes
        bInterval              10

Obviously, the feature units are used for volume control solely. I
wonder, how the audio signal flow looks like..

> Well.  What is the output of "xxd -g1 /proc/bus/usb/003/002" (where
> 003 and 002 are the bus and device numbers)?

I presume lsusb has all the information, if not 
http://clemens.endorphin.org/usb-desc-xxded

Thanks,
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Re: SB Live 24 Ext (was: [ALSA - driver 0000955]: CN-126 - USB 5.1 Audio adapter)

[Clemens Ladisch]

Fruhwirth Clemens wrote:
>         bDescriptorSubtype      6 (FEATURE_UNIT)
>         bmaControls( 0)      0x03
>           Mute
>           Volume
>         bmaControls( 1)      0x00
>         bmaControls( 2)      0x00
>         bmaControls( 3)      0x00
>         bmaControls( 4)      0x00
>         bmaControls( 5)      0x00
>         bmaControls( 6)      0x00
>         ...
>         bDescriptorSubtype      6 (FEATURE_UNIT)
>         bmaControls( 0)      0x02
>           Volume
>         bmaControls( 1)      0x00
>         bmaControls( 2)      0x00
>
> Obviously, the feature units are used for volume control solely.

Yes, and there's only one volume control for all channels.

> I wonder, how the audio signal flow looks like..

The bTerminalID/bUnitID field identifies each unit.  Start at the
output terminals and go back through the bSourceID's.


Regards,
Clemens



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Re: SB Live 24 Ext (was: [ALSA - driver 0000955]: CN-126 - USB 5.1 Audio adapter)

[Fruhwirth Clemens]

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On Fri, 2005-03-04 at 12:09 +0100, Clemens Ladisch wrote:
> Fruhwirth Clemens wrote:

> > I wonder, how the audio signal flow looks like..
> 
> The bTerminalID/bUnitID field identifies each unit.  Start at the
> output terminals and go back through the bSourceID's.

I really start to like USB.

That's how the Creative box should look internal.

Host -> [IT1] -> [FU2] -> [OT3] -> Speaker
Line-in -> [IT4] -> [FU5] -> [OT6] -> Host

That's _very_ minimal. It looks like there is no way to Route Line-In
back to Speaker. Just digitally and sampled.. bad. Don't buy that box.

The only thing nice is, that it's really 24-bit.

      AudioStreaming Interface Descriptor:
        bLength                11
        bDescriptorType        36
        bDescriptorSubtype      2 (FORMAT_TYPE)
        bFormatType             1 (FORMAT_TYPE_I)
        bNrChannels             4
        bSubframeSize           3
        bBitResolution         24
                               ^^

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Re: [ALSA - driver 0000955]: CN-126 - USB 5.1 Audio adapter

[Lee Revell]

On Thu, 2005-03-03 at 16:24 +0100, Fruhwirth Clemens wrote:
> I wonder what's the cause. Has Creative delivered a non-standard
> compliant device one more time? The original EMU10K1 was also FUBAR wrt
> to the PCI standard.

I guess you are referring to only being able to DMA into a 29 bit
address space?

Lee



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