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I am attempting to setup my webcam, but for some reason it will not capture audio. It does alright with video (though not awesome), but I need audio most of ...
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  1. #1
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    Webcam captures no audio...


    I am attempting to setup my webcam, but for some reason it will not capture audio. It does alright with video (though not awesome), but I need audio most of all!

    My webcam is HP Webcam HD-2200. Currently, I am running CrunchBang Statler. I have attempted to fiddle with the settings in alsamixer, but have found nothing that works. It used to work when I was running Ubuntu, so I think this is possible.

    Can somebody help me out with this? I would love to have it working again.

  2. #2
    Linux Guru Rubberman's Avatar
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    I can be found either 40 miles west of Chicago, in Chicago, or in a galaxy far, far away.
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    A webcam has nothing to do with your audio system. It is video only. You also need to be sure that your audio is working (alsa/pulse/et al). So, what are you trying to do? Run Skype?
    Sometimes, real fast is almost as good as real time.
    Just remember, Semper Gumbi - always be flexible!

  3. #3
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    My apologies; I meant that the microphone in my webcam won't pick up audio. I'm trying to run Skype primarily, as well as Google Voice, Cheese... none of it will work (of course)!

    You also need to be sure that your audio is working (alsa/pulse/et al).
    I'm not sure what you mean. How do I make sure it's working exactly?

    02252013.jpg

    I don't think this is what you need to see in order to help me, but this is where I last left my settings. I've tried all the different input sources (thinking I had originally selected the wrong one), but none of them seem to be correct.

  4. #4
    Linux Guru Rubberman's Avatar
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    I can be found either 40 miles west of Chicago, in Chicago, or in a galaxy far, far away.
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    Ok. So from what you say, your webcam also has a microphone embedded it in? I assume it is attached via USB? If so, post the output of the system command (as root or sudo) "lsusb -v" here.
    Sometimes, real fast is almost as good as real time.
    Just remember, Semper Gumbi - always be flexible!

  5. #5
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    May 2012
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    Yes, it is and it is attached via USB. This is what I got with "lsusb -v":

    Code:
    Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
    Device Descriptor:
      bLength                18
      bDescriptorType         1
      bcdUSB               1.10
      bDeviceClass            9 Hub
      bDeviceSubClass         0 Unused
      bDeviceProtocol         0 Full speed (or root) hub
      bMaxPacketSize0        64
      idVendor           0x1d6b Linux Foundation
      idProduct          0x0001 1.1 root hub
      bcdDevice            2.06
      iManufacturer           3 Linux 2.6.32-5-686 uhci_hcd
      iProduct                2 UHCI Host Controller
      iSerial                 1 0000:00:1d.3
      bNumConfigurations      1
      Configuration Descriptor:
        bLength                 9
        bDescriptorType         2
        wTotalLength           25
        bNumInterfaces          1
        bConfigurationValue     1
        iConfiguration          0 
        bmAttributes         0xe0
          Self Powered
          Remote Wakeup
        MaxPower                0mA
        Interface Descriptor:
          bLength                 9
          bDescriptorType         4
          bInterfaceNumber        0
          bAlternateSetting       0
          bNumEndpoints           1
          bInterfaceClass         9 Hub
          bInterfaceSubClass      0 Unused
          bInterfaceProtocol      0 Full speed (or root) hub
          iInterface              0 
          Endpoint Descriptor:
            bLength                 7
            bDescriptorType         5
            bEndpointAddress     0x81  EP 1 IN
            bmAttributes            3
              Transfer Type            Interrupt
              Synch Type               None
              Usage Type               Data
            wMaxPacketSize     0x0002  1x 2 bytes
            bInterval             255
    Hub Descriptor:
      bLength               9
      bDescriptorType      41
      nNbrPorts             2
      wHubCharacteristic 0x000a
        No power switching (usb 1.0)
        Per-port overcurrent protection
      bPwrOn2PwrGood        1 * 2 milli seconds
      bHubContrCurrent      0 milli Ampere
      DeviceRemovable    0x00
      PortPwrCtrlMask    0xff
     Hub Port Status:
       Port 1: 0000.0100 power
       Port 2: 0000.0100 power
    Device Status:     0x0003
      Self Powered
      Remote Wakeup Enabled
    
    Bus 004 Device 003: ID 046d:c51b Logitech, Inc. V220 Cordless Optical Mouse for Notebooks
    Device Descriptor:
      bLength                18
      bDescriptorType         1
      bcdUSB               1.10
      bDeviceClass            0 (Defined at Interface level)
      bDeviceSubClass         0 
      bDeviceProtocol         0 
      bMaxPacketSize0         8
      idVendor           0x046d Logitech, Inc.
      idProduct          0xc51b V220 Cordless Optical Mouse for Notebooks
      bcdDevice           46.00
      iManufacturer           1 Logitech
      iProduct                2 USB Receiver
      iSerial                 0 
      bNumConfigurations      1
      Configuration Descriptor:
        bLength                 9
        bDescriptorType         2
        wTotalLength           59
        bNumInterfaces          2
        bConfigurationValue     1
        iConfiguration          4 RR46.00_B0001
        bmAttributes         0xa0
          (Bus Powered)
          Remote Wakeup
        MaxPower               98mA
        Interface Descriptor:
          bLength                 9
          bDescriptorType         4
          bInterfaceNumber        0
          bAlternateSetting       0
          bNumEndpoints           1
          bInterfaceClass         3 Human Interface Device
          bInterfaceSubClass      1 Boot Interface Subclass
          bInterfaceProtocol      2 Mouse
          iInterface              0 
            HID Device Descriptor:
              bLength                 9
              bDescriptorType        33
              bcdHID               1.11
              bCountryCode            0 Not supported
              bNumDescriptors         1
              bDescriptorType        34 Report
              wDescriptorLength      67
             Report Descriptors: 
               ** UNAVAILABLE **
          Endpoint Descriptor:
            bLength                 7
            bDescriptorType         5
            bEndpointAddress     0x81  EP 1 IN
            bmAttributes            3
              Transfer Type            Interrupt
              Synch Type               None
              Usage Type               Data
            wMaxPacketSize     0x0008  1x 8 bytes
            bInterval              10
        Interface Descriptor:
          bLength                 9
          bDescriptorType         4
          bInterfaceNumber        1
          bAlternateSetting       0
          bNumEndpoints           1
          bInterfaceClass         3 Human Interface Device
          bInterfaceSubClass      0 No Subclass
          bInterfaceProtocol      0 None
          iInterface              0 
            HID Device Descriptor:
              bLength                 9
              bDescriptorType        33
              bcdHID               1.11
              bCountryCode            0 Not supported
              bNumDescriptors         1
              bDescriptorType        34 Report
              wDescriptorLength      27
             Report Descriptors: 
               ** UNAVAILABLE **
          Endpoint Descriptor:
            bLength                 7
            bDescriptorType         5
            bEndpointAddress     0x82  EP 2 IN
            bmAttributes            3
              Transfer Type            Interrupt
              Synch Type               None
              Usage Type               Data
            wMaxPacketSize     0x0008  1x 8 bytes
            bInterval              10
    Device Status:     0x0000
      (Bus Powered)
    
    Bus 004 Device 002: ID 03f0:140c Hewlett-Packard 
    Device Descriptor:
      bLength                18
      bDescriptorType         1
      bcdUSB               2.00
      bDeviceClass            0 (Defined at Interface level)
      bDeviceSubClass         0 
      bDeviceProtocol         0 
      bMaxPacketSize0         8
      idVendor           0x03f0 Hewlett-Packard
      idProduct          0x140c 
      bcdDevice            0.01
      iManufacturer           1 HP
      iProduct                2 HP Wireless Keyboard Kit
      iSerial                 0 
      bNumConfigurations      1
      Configuration Descriptor:
        bLength                 9
        bDescriptorType         2
        wTotalLength           59
        bNumInterfaces          2
        bConfigurationValue     1
        iConfiguration          0 
        bmAttributes         0xa0
          (Bus Powered)
          Remote Wakeup
        MaxPower               98mA
        Interface Descriptor:
          bLength                 9
          bDescriptorType         4
          bInterfaceNumber        0
          bAlternateSetting       0
          bNumEndpoints           1
          bInterfaceClass         3 Human Interface Device
          bInterfaceSubClass      1 Boot Interface Subclass
          bInterfaceProtocol      1 Keyboard
          iInterface              0 
            HID Device Descriptor:
              bLength                 9
              bDescriptorType        33
              bcdHID               1.11
              bCountryCode            0 Not supported
              bNumDescriptors         1
              bDescriptorType        34 Report
              wDescriptorLength      43
             Report Descriptors: 
               ** UNAVAILABLE **
          Endpoint Descriptor:
            bLength                 7
            bDescriptorType         5
            bEndpointAddress     0x81  EP 1 IN
            bmAttributes            3
              Transfer Type            Interrupt
              Synch Type               None
              Usage Type               Data
            wMaxPacketSize     0x0008  1x 8 bytes
            bInterval              10
        Interface Descriptor:
          bLength                 9
          bDescriptorType         4
          bInterfaceNumber        1
          bAlternateSetting       0
          bNumEndpoints           1
          bInterfaceClass         3 Human Interface Device
          bInterfaceSubClass      1 Boot Interface Subclass
          bInterfaceProtocol      2 Mouse
          iInterface              0 
            HID Device Descriptor:
              bLength                 9
              bDescriptorType        33
              bcdHID               1.11
              bCountryCode            0 Not supported
              bNumDescriptors         1
              bDescriptorType        34 Report
              wDescriptorLength     242
             Report Descriptors: 
               ** UNAVAILABLE **
          Endpoint Descriptor:
            bLength                 7
            bDescriptorType         5
            bEndpointAddress     0x82  EP 2 IN
            bmAttributes            3
              Transfer Type            Interrupt
              Synch Type               None
              Usage Type               Data
            wMaxPacketSize     0x0008  1x 8 bytes
            bInterval              10
    Device Status:     0x0000
      (Bus Powered)
    
    Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
    Device Descriptor:
      bLength                18
      bDescriptorType         1
      bcdUSB               1.10
      bDeviceClass            9 Hub
      bDeviceSubClass         0 Unused
      bDeviceProtocol         0 Full speed (or root) hub
      bMaxPacketSize0        64
      idVendor           0x1d6b Linux Foundation
      idProduct          0x0001 1.1 root hub
      bcdDevice            2.06
      iManufacturer           3 Linux 2.6.32-5-686 uhci_hcd
      iProduct                2 UHCI Host Controller
      iSerial                 1 0000:00:1d.2
      bNumConfigurations      1
      Configuration Descriptor:
        bLength                 9
        bDescriptorType         2
        wTotalLength           25
        bNumInterfaces          1
        bConfigurationValue     1
        iConfiguration          0 
        bmAttributes         0xe0
          Self Powered
          Remote Wakeup
        MaxPower                0mA
        Interface Descriptor:
          bLength                 9
          bDescriptorType         4
          bInterfaceNumber        0
          bAlternateSetting       0
          bNumEndpoints           1
          bInterfaceClass         9 Hub
          bInterfaceSubClass      0 Unused
          bInterfaceProtocol      0 Full speed (or root) hub
          iInterface              0 
          Endpoint Descriptor:
            bLength                 7
            bDescriptorType         5
            bEndpointAddress     0x81  EP 1 IN
            bmAttributes            3
              Transfer Type            Interrupt
              Synch Type               None
              Usage Type               Data
            wMaxPacketSize     0x0002  1x 2 bytes
            bInterval             255
    Hub Descriptor:
      bLength               9
      bDescriptorType      41
      nNbrPorts             2
      wHubCharacteristic 0x000a
        No power switching (usb 1.0)
        Per-port overcurrent protection
      bPwrOn2PwrGood        1 * 2 milli seconds
      bHubContrCurrent      0 milli Ampere
      DeviceRemovable    0x00
      PortPwrCtrlMask    0xff
     Hub Port Status:
       Port 1: 0000.0303 lowspeed power enable connect
       Port 2: 0000.0303 lowspeed power enable connect
    Device Status:     0x0003
      Self Powered
      Remote Wakeup Enabled
    
    Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
    Device Descriptor:
      bLength                18
      bDescriptorType         1
      bcdUSB               1.10
      bDeviceClass            9 Hub
      bDeviceSubClass         0 Unused
      bDeviceProtocol         0 Full speed (or root) hub
      bMaxPacketSize0        64
      idVendor           0x1d6b Linux Foundation
      idProduct          0x0001 1.1 root hub
      bcdDevice            2.06
      iManufacturer           3 Linux 2.6.32-5-686 uhci_hcd
      iProduct                2 UHCI Host Controller
      iSerial                 1 0000:00:1d.1
      bNumConfigurations      1
      Configuration Descriptor:
        bLength                 9
        bDescriptorType         2
        wTotalLength           25
        bNumInterfaces          1
        bConfigurationValue     1
        iConfiguration          0 
        bmAttributes         0xe0
          Self Powered
          Remote Wakeup
        MaxPower                0mA
        Interface Descriptor:
          bLength                 9
          bDescriptorType         4
          bInterfaceNumber        0
          bAlternateSetting       0
          bNumEndpoints           1
          bInterfaceClass         9 Hub
          bInterfaceSubClass      0 Unused
          bInterfaceProtocol      0 Full speed (or root) hub
          iInterface              0 
          Endpoint Descriptor:
            bLength                 7
            bDescriptorType         5
            bEndpointAddress     0x81  EP 1 IN
            bmAttributes            3
              Transfer Type            Interrupt
              Synch Type               None
              Usage Type               Data
            wMaxPacketSize     0x0002  1x 2 bytes
            bInterval             255
    Hub Descriptor:
      bLength               9
      bDescriptorType      41
      nNbrPorts             2
      wHubCharacteristic 0x000a
        No power switching (usb 1.0)
        Per-port overcurrent protection
      bPwrOn2PwrGood        1 * 2 milli seconds
      bHubContrCurrent      0 milli Ampere
      DeviceRemovable    0x00
      PortPwrCtrlMask    0xff
     Hub Port Status:
       Port 1: 0000.0100 power
       Port 2: 0000.0100 power
    Device Status:     0x0003
      Self Powered
      Remote Wakeup Enabled
    
    Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
    Device Descriptor:
      bLength                18
      bDescriptorType         1
      bcdUSB               1.10
      bDeviceClass            9 Hub
      bDeviceSubClass         0 Unused
      bDeviceProtocol         0 Full speed (or root) hub
      bMaxPacketSize0        64
      idVendor           0x1d6b Linux Foundation
      idProduct          0x0001 1.1 root hub
      bcdDevice            2.06
      iManufacturer           3 Linux 2.6.32-5-686 uhci_hcd
      iProduct                2 UHCI Host Controller
      iSerial                 1 0000:00:1d.0
      bNumConfigurations      1
      Configuration Descriptor:
        bLength                 9
        bDescriptorType         2
        wTotalLength           25
        bNumInterfaces          1
        bConfigurationValue     1
        iConfiguration          0 
        bmAttributes         0xe0
          Self Powered
          Remote Wakeup
        MaxPower                0mA
        Interface Descriptor:
          bLength                 9
          bDescriptorType         4
          bInterfaceNumber        0
          bAlternateSetting       0
          bNumEndpoints           1
          bInterfaceClass         9 Hub
          bInterfaceSubClass      0 Unused
          bInterfaceProtocol      0 Full speed (or root) hub
          iInterface              0 
          Endpoint Descriptor:
            bLength                 7
            bDescriptorType         5
            bEndpointAddress     0x81  EP 1 IN
            bmAttributes            3
              Transfer Type            Interrupt
              Synch Type               None
              Usage Type               Data
            wMaxPacketSize     0x0002  1x 2 bytes
            bInterval             255
    Hub Descriptor:
      bLength               9
      bDescriptorType      41
      nNbrPorts             2
      wHubCharacteristic 0x000a
        No power switching (usb 1.0)
        Per-port overcurrent protection
      bPwrOn2PwrGood        1 * 2 milli seconds
      bHubContrCurrent      0 milli Ampere
      DeviceRemovable    0x00
      PortPwrCtrlMask    0xff
     Hub Port Status:
       Port 1: 0000.0100 power
       Port 2: 0000.0100 power
    Device Status:     0x0003
      Self Powered
      Remote Wakeup Enabled
    
    Bus 001 Device 007: ID 0bda:0111 Realtek Semiconductor Corp. Card Reader
    Device Descriptor:
      bLength                18
      bDescriptorType         1
      bcdUSB               2.00
      bDeviceClass            0 (Defined at Interface level)
      bDeviceSubClass         0 
      bDeviceProtocol         0 
      bMaxPacketSize0        64
      idVendor           0x0bda Realtek Semiconductor Corp.
      idProduct          0x0111 Card Reader
      bcdDevice           11.22
      iManufacturer           1 Generic
      iProduct                2 USB2.0-CRW
      iSerial                 3 20021111153705700
      bNumConfigurations      1
      Configuration Descriptor:
        bLength                 9
        bDescriptorType         2
        wTotalLength           32
        bNumInterfaces          1
        bConfigurationValue     1
        iConfiguration          4 CARD READER
        bmAttributes         0x80
          (Bus Powered)
        MaxPower              500mA
        Interface Descriptor:
          bLength                 9
          bDescriptorType         4
          bInterfaceNumber        0
          bAlternateSetting       0
          bNumEndpoints           2
          bInterfaceClass         8 Mass Storage
          bInterfaceSubClass      6 SCSI
          bInterfaceProtocol     80 Bulk (Zip)
          iInterface              5 Bulk-In, Bulk-Out, Interface
          Endpoint Descriptor:
            bLength                 7
            bDescriptorType         5
            bEndpointAddress     0x01  EP 1 OUT
            bmAttributes            2
              Transfer Type            Bulk
              Synch Type               None
              Usage Type               Data
            wMaxPacketSize     0x0200  1x 512 bytes
            bInterval               0
          Endpoint Descriptor:
            bLength                 7
            bDescriptorType         5
            bEndpointAddress     0x82  EP 2 IN
            bmAttributes            2
              Transfer Type            Bulk
              Synch Type               None
              Usage Type               Data
            wMaxPacketSize     0x0200  1x 512 bytes
            bInterval               0
    Device Qualifier (for other device speed):
      bLength                10
      bDescriptorType         6
      bcdUSB               2.00
      bDeviceClass            0 (Defined at Interface level)
      bDeviceSubClass         0 
      bDeviceProtocol         0 
      bMaxPacketSize0        64
      bNumConfigurations      1
    Device Status:     0x0000
      (Bus Powered)
    
    Bus 001 Device 004: ID 0846:4260 NetGear, Inc. WG111v3 54 Mbps Wireless [realtek RTL8187B]
    Device Descriptor:
      bLength                18
      bDescriptorType         1
      bcdUSB               2.00
      bDeviceClass            0 (Defined at Interface level)
      bDeviceSubClass         0 
      bDeviceProtocol         0 
      bMaxPacketSize0        64
      idVendor           0x0846 NetGear, Inc.
      idProduct          0x4260 WG111v3 54 Mbps Wireless [realtek RTL8187B]
      bcdDevice            2.00
      iManufacturer           1 Manufacturer_NETGEAR
      iProduct                2 NETGEAR WG111v3
      iSerial                 3 001B2FD055BB
      bNumConfigurations      1
      Configuration Descriptor:
        bLength                 9
        bDescriptorType         2
        wTotalLength           81
        bNumInterfaces          1
        bConfigurationValue     1
        iConfiguration          4 Wireless Network Card
        bmAttributes         0x80
          (Bus Powered)
        MaxPower              500mA
        Interface Descriptor:
          bLength                 9
          bDescriptorType         4
          bInterfaceNumber        0
          bAlternateSetting       0
          bNumEndpoints           9
          bInterfaceClass       255 Vendor Specific Class
          bInterfaceSubClass    255 Vendor Specific Subclass
          bInterfaceProtocol    255 Vendor Specific Protocol
          iInterface              2 NETGEAR WG111v3
          Endpoint Descriptor:
            bLength                 7
            bDescriptorType         5
            bEndpointAddress     0x83  EP 3 IN
            bmAttributes            2
              Transfer Type            Bulk
              Synch Type               None
              Usage Type               Data
            wMaxPacketSize     0x0200  1x 512 bytes
            bInterval               0
          Endpoint Descriptor:
            bLength                 7
            bDescriptorType         5
            bEndpointAddress     0x04  EP 4 OUT
            bmAttributes            2
              Transfer Type            Bulk
              Synch Type               None
              Usage Type               Data
            wMaxPacketSize     0x0200  1x 512 bytes
            bInterval               0
          Endpoint Descriptor:
            bLength                 7
            bDescriptorType         5
            bEndpointAddress     0x05  EP 5 OUT
            bmAttributes            2
              Transfer Type            Bulk
              Synch Type               None
              Usage Type               Data
            wMaxPacketSize     0x0200  1x 512 bytes
            bInterval               0
          Endpoint Descriptor:
            bLength                 7
            bDescriptorType         5
            bEndpointAddress     0x06  EP 6 OUT
            bmAttributes            2
              Transfer Type            Bulk
              Synch Type               None
              Usage Type               Data
            wMaxPacketSize     0x0200  1x 512 bytes
            bInterval               0
          Endpoint Descriptor:
            bLength                 7
            bDescriptorType         5
            bEndpointAddress     0x07  EP 7 OUT
            bmAttributes            2
              Transfer Type            Bulk
              Synch Type               None
              Usage Type               Data
            wMaxPacketSize     0x0200  1x 512 bytes
            bInterval               0
          Endpoint Descriptor:
            bLength                 7
            bDescriptorType         5
            bEndpointAddress     0x89  EP 9 IN
            bmAttributes            2
              Transfer Type            Bulk
              Synch Type               None
              Usage Type               Data
            wMaxPacketSize     0x0200  1x 512 bytes
            bInterval               0
          Endpoint Descriptor:
            bLength                 7
            bDescriptorType         5
            bEndpointAddress     0x0a  EP 10 OUT
            bmAttributes            2
              Transfer Type            Bulk
              Synch Type               None
              Usage Type               Data
            wMaxPacketSize     0x0200  1x 512 bytes
            bInterval               0
          Endpoint Descriptor:
            bLength                 7
            bDescriptorType         5
            bEndpointAddress     0x0b  EP 11 OUT
            bmAttributes            2
              Transfer Type            Bulk
              Synch Type               None
              Usage Type               Data
            wMaxPacketSize     0x0200  1x 512 bytes
            bInterval               0
          Endpoint Descriptor:
            bLength                 7
            bDescriptorType         5
            bEndpointAddress     0x0c  EP 12 OUT
            bmAttributes            2
              Transfer Type            Bulk
              Synch Type               None
              Usage Type               Data
            wMaxPacketSize     0x0200  1x 512 bytes
            bInterval               0
    Device Qualifier (for other device speed):
      bLength                10
      bDescriptorType         6
      bcdUSB               2.00
      bDeviceClass            0 (Defined at Interface level)
      bDeviceSubClass         0 
      bDeviceProtocol         0 
      bMaxPacketSize0        64
      bNumConfigurations      1
    Device Status:     0x0000
      (Bus Powered)
    
    Bus 001 Device 003: ID 0bc2:3001 Seagate RSS LLC 
    Device Descriptor:
      bLength                18
      bDescriptorType         1
      bcdUSB               2.00
      bDeviceClass            0 (Defined at Interface level)
      bDeviceSubClass         0 
      bDeviceProtocol         0 
      bMaxPacketSize0        64
      idVendor           0x0bc2 Seagate RSS LLC
      idProduct          0x3001 
      bcdDevice            0.00
      iManufacturer           1 Seagate
      iProduct                2 FreeAgent
      iSerial                 3 2GEVY5C9
      bNumConfigurations      1
      Configuration Descriptor:
        bLength                 9
        bDescriptorType         2
        wTotalLength           32
        bNumInterfaces          1
        bConfigurationValue     1
        iConfiguration          5 Config0
        bmAttributes         0xc0
          Self Powered
        MaxPower                0mA
        Interface Descriptor:
          bLength                 9
          bDescriptorType         4
          bInterfaceNumber        0
          bAlternateSetting       0
          bNumEndpoints           2
          bInterfaceClass         8 Mass Storage
          bInterfaceSubClass      6 SCSI
          bInterfaceProtocol     80 Bulk (Zip)
          iInterface              4 Interface0
          Endpoint Descriptor:
            bLength                 7
            bDescriptorType         5
            bEndpointAddress     0x01  EP 1 OUT
            bmAttributes            2
              Transfer Type            Bulk
              Synch Type               None
              Usage Type               Data
            wMaxPacketSize     0x0200  1x 512 bytes
            bInterval               0
          Endpoint Descriptor:
            bLength                 7
            bDescriptorType         5
            bEndpointAddress     0x81  EP 1 IN
            bmAttributes            2
              Transfer Type            Bulk
              Synch Type               None
              Usage Type               Data
            wMaxPacketSize     0x0200  1x 512 bytes
            bInterval               0
    Device Qualifier (for other device speed):
      bLength                10
      bDescriptorType         6
      bcdUSB               2.00
      bDeviceClass            0 (Defined at Interface level)
      bDeviceSubClass         0 
      bDeviceProtocol         0 
      bMaxPacketSize0        64
      bNumConfigurations      1
    Device Status:     0x0001
      Self Powered
    
    Bus 001 Device 002: ID 03f0:a707 Hewlett-Packard 
    Device Descriptor:
      bLength                18
      bDescriptorType         1
      bcdUSB               2.00
      bDeviceClass          239 Miscellaneous Device
      bDeviceSubClass         2 ?
      bDeviceProtocol         1 Interface Association
      bMaxPacketSize0        64
      idVendor           0x03f0 Hewlett-Packard
      idProduct          0xa707 
      bcdDevice            0.30
      iManufacturer           1 HP Webcam HD-2200
      iProduct                2 HP Webcam HD-2200
      iSerial                 0 
      bNumConfigurations      1
      Configuration Descriptor:
        bLength                 9
        bDescriptorType         2
        wTotalLength         1209
        bNumInterfaces          4
        bConfigurationValue     1
        iConfiguration          0 
        bmAttributes         0x80
          (Bus Powered)
        MaxPower              200mA
        Interface Association:
          bLength                 8
          bDescriptorType        11
          bFirstInterface         0
          bInterfaceCount         2
          bFunctionClass         14 Video
          bFunctionSubClass       3 Video Interface Collection
          bFunctionProtocol       0 
          iFunction               4 HP Webcam HD-2200
        Interface Descriptor:
          bLength                 9
          bDescriptorType         4
          bInterfaceNumber        0
          bAlternateSetting       0
          bNumEndpoints           1
          bInterfaceClass        14 Video
          bInterfaceSubClass      1 Video Control
          bInterfaceProtocol      0 
          iInterface              4 HP Webcam HD-2200
          VideoControl Interface Descriptor:
            bLength                13
            bDescriptorType        36
            bDescriptorSubtype      1 (HEADER)
            bcdUVC               1.00
            wTotalLength          105
            dwClockFrequency       30.000000MHz
            bInCollection           1
            baInterfaceNr( 0)       1
          VideoControl Interface Descriptor:
            bLength                18
            bDescriptorType        36
            bDescriptorSubtype      2 (INPUT_TERMINAL)
            bTerminalID             1
            wTerminalType      0x0201 Camera Sensor
            bAssocTerminal          5
            iTerminal               0 
            wObjectiveFocalLengthMin      0
            wObjectiveFocalLengthMax      0
            wOcularFocalLength            0
            bControlSize                  3
            bmControls           0x0000000e
              Auto-Exposure Mode
              Auto-Exposure Priority
              Exposure Time (Absolute)
          VideoControl Interface Descriptor:
            bLength                11
            bDescriptorType        36
            bDescriptorSubtype      5 (PROCESSING_UNIT)
          Warning: Descriptor too short
            bUnitID                 2
            bSourceID               1
            wMaxMultiplier          0
            bControlSize            2
            bmControls     0x0000177f
              Brightness
              Contrast
              Hue
              Saturation
              Sharpness
              Gamma
              White Balance Temperature
              Backlight Compensation
              Gain
              Power Line Frequency
              White Balance Temperature, Auto
            iProcessing             0 
            bmVideoStandards     0x1b
              None
              NTSC - 525/60
              SECAM - 625/50
              NTSC - 625/50
          VideoControl Interface Descriptor:
            bLength                27
            bDescriptorType        36
            bDescriptorSubtype      6 (EXTENSION_UNIT)
            bUnitID                 3
            guidExtensionCode         {0a3e1874-8254-1a48-b402-48b8b8c49cc8}
            bNumControl            10
            bNrPins                 1
            baSourceID( 0)          2
            bControlSize            2
            bmControls( 0)       0xff
            bmControls( 1)       0x03
            iExtension              0 
          VideoControl Interface Descriptor:
            bLength                27
            bDescriptorType        36
            bDescriptorSubtype      6 (EXTENSION_UNIT)
            bUnitID                 4
            guidExtensionCode         {5bef79f6-df54-fc4b-b8cb-ca7e89a5233f}
            bNumControl             1
            bNrPins                 1
            baSourceID( 0)          3
            bControlSize            2
            bmControls( 0)       0x00
            bmControls( 1)       0x08
            iExtension              0 
          VideoControl Interface Descriptor:
            bLength                 9
            bDescriptorType        36
            bDescriptorSubtype      3 (OUTPUT_TERMINAL)
            bTerminalID             5
            wTerminalType      0x0101 USB Streaming
            bAssocTerminal          0
            bSourceID               4
            iTerminal               0 
          Endpoint Descriptor:
            bLength                 7
            bDescriptorType         5
            bEndpointAddress     0x81  EP 1 IN
            bmAttributes            3
              Transfer Type            Interrupt
              Synch Type               None
              Usage Type               Data
            wMaxPacketSize     0x0010  1x 16 bytes
            bInterval               8
        Interface Descriptor:
          bLength                 9
          bDescriptorType         4
          bInterfaceNumber        1
          bAlternateSetting       0
          bNumEndpoints           0
          bInterfaceClass        14 Video
          bInterfaceSubClass      2 Video Streaming
          bInterfaceProtocol      0 
          iInterface              0 
          VideoStreaming Interface Descriptor:
            bLength                            15
            bDescriptorType                    36
            bDescriptorSubtype                  1 (INPUT_HEADER)
            bNumFormats                         2
            wTotalLength                      805
            bEndPointAddress                  130
            bmInfo                              1
            bTerminalLink                       5
            bStillCaptureMethod                 2
            bTriggerSupport                     1
            bTriggerUsage                       1
            bControlSize                        1
            bmaControls( 0)                    27
            bmaControls( 1)                    27
          VideoStreaming Interface Descriptor:
            bLength                            27
            bDescriptorType                    36
            bDescriptorSubtype                  4 (FORMAT_UNCOMPRESSED)
            bFormatIndex                        1
            bNumFrameDescriptors                7
            guidFormat                            {59555932-0000-1000-8000-00aa00389b71}
            bBitsPerPixel                      16
            bDefaultFrameIndex                  1
            bAspectRatioX                       0
            bAspectRatioY                       0
            bmInterlaceFlags                 0x02
              Interlaced stream or variable: No
              Fields per frame: 2 fields
              Field 1 first: No
              Field pattern: Field 1 only
              bCopyProtect                      0
          VideoStreaming Interface Descriptor:
            bLength                            50
            bDescriptorType                    36
            bDescriptorSubtype                  5 (FRAME_UNCOMPRESSED)
            bFrameIndex                         1
            bmCapabilities                   0x00
              Still image unsupported
            wWidth                            640
            wHeight                           480
            dwMinBitRate                 24576000
            dwMaxBitRate                147456000
            dwMaxVideoFrameBufferSize      614400
            dwDefaultFrameInterval         333333
            bFrameIntervalType                  6
            dwFrameInterval( 0)            333333
            dwFrameInterval( 1)            400000
            dwFrameInterval( 2)            500000
            dwFrameInterval( 3)            666666
            dwFrameInterval( 4)           1000000
            dwFrameInterval( 5)           2000000
          VideoStreaming Interface Descriptor:
            bLength                            50
            bDescriptorType                    36
            bDescriptorSubtype                  5 (FRAME_UNCOMPRESSED)
            bFrameIndex                         2
            bmCapabilities                   0x00
              Still image unsupported
            wWidth                            352
            wHeight                           288
            dwMinBitRate                  8110080
            dwMaxBitRate                 48660480
            dwMaxVideoFrameBufferSize      202752
            dwDefaultFrameInterval         333333
            bFrameIntervalType                  6
            dwFrameInterval( 0)            333333
            dwFrameInterval( 1)            400000
            dwFrameInterval( 2)            500000
            dwFrameInterval( 3)            666666
            dwFrameInterval( 4)           1000000
            dwFrameInterval( 5)           2000000
          VideoStreaming Interface Descriptor:
            bLength                            50
            bDescriptorType                    36
            bDescriptorSubtype                  5 (FRAME_UNCOMPRESSED)
            bFrameIndex                         3
            bmCapabilities                   0x00
              Still image unsupported
            wWidth                            320
            wHeight                           240
            dwMinBitRate                  6144000
            dwMaxBitRate                 36864000
            dwMaxVideoFrameBufferSize      153600
            dwDefaultFrameInterval         333333
            bFrameIntervalType                  6
            dwFrameInterval( 0)            333333
            dwFrameInterval( 1)            400000
            dwFrameInterval( 2)            500000
            dwFrameInterval( 3)            666666
            dwFrameInterval( 4)           1000000
            dwFrameInterval( 5)           2000000
          VideoStreaming Interface Descriptor:
            bLength                            50
            bDescriptorType                    36
            bDescriptorSubtype                  5 (FRAME_UNCOMPRESSED)
            bFrameIndex                         4
            bmCapabilities                   0x00
              Still image unsupported
            wWidth                            176
            wHeight                           144
            dwMinBitRate                  2027520
            dwMaxBitRate                 12165120
            dwMaxVideoFrameBufferSize       50688
            dwDefaultFrameInterval         333333
            bFrameIntervalType                  6
            dwFrameInterval( 0)            333333
            dwFrameInterval( 1)            400000
            dwFrameInterval( 2)            500000
            dwFrameInterval( 3)            666666
            dwFrameInterval( 4)           1000000
            dwFrameInterval( 5)           2000000
          VideoStreaming Interface Descriptor:
            bLength                            50
            bDescriptorType                    36
            bDescriptorSubtype                  5 (FRAME_UNCOMPRESSED)
            bFrameIndex                         5
            bmCapabilities                   0x00
              Still image unsupported
            wWidth                            160
            wHeight                           120
            dwMinBitRate                  1536000
            dwMaxBitRate                  9216000
            dwMaxVideoFrameBufferSize       38400
            dwDefaultFrameInterval         333333
            bFrameIntervalType                  6
            dwFrameInterval( 0)            333333
            dwFrameInterval( 1)            400000
            dwFrameInterval( 2)            500000
            dwFrameInterval( 3)            666666
            dwFrameInterval( 4)           1000000
            dwFrameInterval( 5)           2000000
          VideoStreaming Interface Descriptor:
            bLength                            38
            bDescriptorType                    36
            bDescriptorSubtype                  5 (FRAME_UNCOMPRESSED)
            bFrameIndex                         6
            bmCapabilities                   0x00
              Still image unsupported
            wWidth                            800
            wHeight                           600
            dwMinBitRate                 38400000
            dwMaxBitRate                115200000
            dwMaxVideoFrameBufferSize      960000
            dwDefaultFrameInterval         666666
            bFrameIntervalType                  3
            dwFrameInterval( 0)            666666
            dwFrameInterval( 1)           1000000
            dwFrameInterval( 2)           2000000
          VideoStreaming Interface Descriptor:
            bLength                            34
            bDescriptorType                    36
            bDescriptorSubtype                  5 (FRAME_UNCOMPRESSED)
            bFrameIndex                         7
            bmCapabilities                   0x00
              Still image unsupported
            wWidth                           1280
            wHeight                           720
            dwMinBitRate                 73728000
            dwMaxBitRate                110592000
            dwMaxVideoFrameBufferSize     1843200
            dwDefaultFrameInterval        1333333
            bFrameIntervalType                  2
            dwFrameInterval( 0)           1333333
            dwFrameInterval( 1)           2000000
          VideoStreaming Interface Descriptor:
            bLength                            34
            bDescriptorType                    36
            bDescriptorSubtype                  3 (STILL_IMAGE_FRAME)
            bEndpointAddress                    0
            bNumImageSizePatterns               7
            wWidth( 0)                        640
            wHeight( 0)                       480
            wWidth( 1)                        352
            wHeight( 1)                       288
            wWidth( 2)                        320
            wHeight( 2)                       240
            wWidth( 3)                        176
            wHeight( 3)                       144
            wWidth( 4)                        160
            wHeight( 4)                       120
            wWidth( 5)                        800
            wHeight( 5)                       600
            wWidth( 6)                       1280
            wHeight( 6)                       720
            bNumCompressionPatterns             7
          VideoStreaming Interface Descriptor:
            bLength                             6
            bDescriptorType                    36
            bDescriptorSubtype                 13 (COLORFORMAT)
            bColorPrimaries                     1 (BT.709,sRGB)
            bTransferCharacteristics            1 (BT.709)
            bMatrixCoefficients                 4 (SMPTE 170M (BT.601))
          VideoStreaming Interface Descriptor:
            bLength                            11
            bDescriptorType                    36
            bDescriptorSubtype                  6 (FORMAT_MJPEG)
            bFormatIndex                        2
            bNumFrameDescriptors                7
            bFlags                              0
              Fixed-size samples: No
            bDefaultFrameIndex                  1
            bAspectRatioX                       0
            bAspectRatioY                       0
            bmInterlaceFlags                 0x02
              Interlaced stream or variable: No
              Fields per frame: 2 fields
              Field 1 first: No
              Field pattern: Field 1 only
              bCopyProtect                      0
          VideoStreaming Interface Descriptor:
            bLength                            50
            bDescriptorType                    36
            bDescriptorSubtype                  7 (FRAME_MJPEG)
            bFrameIndex                         1
            bmCapabilities                   0x00
              Still image unsupported
            wWidth                            640
            wHeight                           480
            dwMinBitRate                 36864000
            dwMaxBitRate                221184000
            dwMaxVideoFrameBufferSize      921600
            dwDefaultFrameInterval         333333
            bFrameIntervalType                  6
            dwFrameInterval( 0)            333333
            dwFrameInterval( 1)            400000
            dwFrameInterval( 2)            500000
            dwFrameInterval( 3)            666666
            dwFrameInterval( 4)           1000000
            dwFrameInterval( 5)           2000000
          VideoStreaming Interface Descriptor:
            bLength                            50
            bDescriptorType                    36
            bDescriptorSubtype                  7 (FRAME_MJPEG)
            bFrameIndex                         2
            bmCapabilities                   0x00
              Still image unsupported
            wWidth                            352
            wHeight                           288
            dwMinBitRate                 12165120
            dwMaxBitRate                 72990720
            dwMaxVideoFrameBufferSize      304128
            dwDefaultFrameInterval         333333
            bFrameIntervalType                  6
            dwFrameInterval( 0)            333333
            dwFrameInterval( 1)            400000
            dwFrameInterval( 2)            500000
            dwFrameInterval( 3)            666666
            dwFrameInterval( 4)           1000000
            dwFrameInterval( 5)           2000000
          VideoStreaming Interface Descriptor:
            bLength                            50
            bDescriptorType                    36
            bDescriptorSubtype                  7 (FRAME_MJPEG)
            bFrameIndex                         3
            bmCapabilities                   0x00
              Still image unsupported
            wWidth                            320
            wHeight                           240
            dwMinBitRate                  9216000
            dwMaxBitRate                 55296000
            dwMaxVideoFrameBufferSize      230400
            dwDefaultFrameInterval         333333
            bFrameIntervalType                  6
            dwFrameInterval( 0)            333333
            dwFrameInterval( 1)            400000
            dwFrameInterval( 2)            500000
            dwFrameInterval( 3)            666666
            dwFrameInterval( 4)           1000000
            dwFrameInterval( 5)           2000000
          VideoStreaming Interface Descriptor:
            bLength                            50
            bDescriptorType                    36
            bDescriptorSubtype                  7 (FRAME_MJPEG)
            bFrameIndex                         4
            bmCapabilities                   0x00
              Still image unsupported
            wWidth                            176
            wHeight                           144
            dwMinBitRate                  3041280
            dwMaxBitRate                 18247680
            dwMaxVideoFrameBufferSize       76032
            dwDefaultFrameInterval         333333
            bFrameIntervalType                  6
            dwFrameInterval( 0)            333333
            dwFrameInterval( 1)            400000
            dwFrameInterval( 2)            500000
            dwFrameInterval( 3)            666666
            dwFrameInterval( 4)           1000000
            dwFrameInterval( 5)           2000000
          VideoStreaming Interface Descriptor:
            bLength                            50
            bDescriptorType                    36
            bDescriptorSubtype                  7 (FRAME_MJPEG)
            bFrameIndex                         5
            bmCapabilities                   0x00
              Still image unsupported
            wWidth                            160
            wHeight                           120
            dwMinBitRate                  2304000
            dwMaxBitRate                 13824000
            dwMaxVideoFrameBufferSize       57600
            dwDefaultFrameInterval         333333
            bFrameIntervalType                  6
            dwFrameInterval( 0)            333333
            dwFrameInterval( 1)            400000
            dwFrameInterval( 2)            500000
            dwFrameInterval( 3)            666666
            dwFrameInterval( 4)           1000000
            dwFrameInterval( 5)           2000000
          VideoStreaming Interface Descriptor:
            bLength                            50
            bDescriptorType                    36
            bDescriptorSubtype                  7 (FRAME_MJPEG)
            bFrameIndex                         6
            bmCapabilities                   0x00
              Still image unsupported
            wWidth                            800
            wHeight                           600
            dwMinBitRate                 57600000
            dwMaxBitRate                345600000
            dwMaxVideoFrameBufferSize     1440000
            dwDefaultFrameInterval         333333
            bFrameIntervalType                  6
            dwFrameInterval( 0)            333333
            dwFrameInterval( 1)            400000
            dwFrameInterval( 2)            500000
            dwFrameInterval( 3)            666666
            dwFrameInterval( 4)           1000000
            dwFrameInterval( 5)           2000000
          VideoStreaming Interface Descriptor:
            bLength                            50
            bDescriptorType                    36
            bDescriptorSubtype                  7 (FRAME_MJPEG)
            bFrameIndex                         7
            bmCapabilities                   0x00
              Still image unsupported
            wWidth                           1280
            wHeight                           720
            dwMinBitRate                110592000
            dwMaxBitRate                663552000
            dwMaxVideoFrameBufferSize     2764800
            dwDefaultFrameInterval         333333
            bFrameIntervalType                  6
            dwFrameInterval( 0)            333333
            dwFrameInterval( 1)            400000
            dwFrameInterval( 2)            500000
            dwFrameInterval( 3)            666666
            dwFrameInterval( 4)           1000000
            dwFrameInterval( 5)           2000000
          VideoStreaming Interface Descriptor:
            bLength                            34
            bDescriptorType                    36
            bDescriptorSubtype                  3 (STILL_IMAGE_FRAME)
            bEndpointAddress                    0
            bNumImageSizePatterns               7
            wWidth( 0)                        640
            wHeight( 0)                       480
            wWidth( 1)                        352
            wHeight( 1)                       288
            wWidth( 2)                        320
            wHeight( 2)                       240
            wWidth( 3)                        176
            wHeight( 3)                       144
            wWidth( 4)                        160
            wHeight( 4)                       120
            wWidth( 5)                        800
            wHeight( 5)                       600
            wWidth( 6)                       1280
            wHeight( 6)                       720
            bNumCompressionPatterns             7
          VideoStreaming Interface Descriptor:
            bLength                             6
            bDescriptorType                    36
            bDescriptorSubtype                 13 (COLORFORMAT)
            bColorPrimaries                     1 (BT.709,sRGB)
            bTransferCharacteristics            1 (BT.709)
            bMatrixCoefficients                 4 (SMPTE 170M (BT.601))
        Interface Descriptor:
          bLength                 9
          bDescriptorType         4
          bInterfaceNumber        1
          bAlternateSetting       1
          bNumEndpoints           1
          bInterfaceClass        14 Video
          bInterfaceSubClass      2 Video Streaming
          bInterfaceProtocol      0 
          iInterface              0 
          Endpoint Descriptor:
            bLength                 7
            bDescriptorType         5
            bEndpointAddress     0x82  EP 2 IN
            bmAttributes            5
              Transfer Type            Isochronous
              Synch Type               Asynchronous
              Usage Type               Data
            wMaxPacketSize     0x13fc  3x 1020 bytes
            bInterval               1
        Interface Association:
          bLength                 8
          bDescriptorType        11
          bFirstInterface         2
          bInterfaceCount         2
          bFunctionClass          1 Audio
          bFunctionSubClass       2 Streaming
          bFunctionProtocol       0 
          iFunction               5 HP Webcam HD-2200
        Interface Descriptor:
          bLength                 9
          bDescriptorType         4
          bInterfaceNumber        2
          bAlternateSetting       0
          bNumEndpoints           0
          bInterfaceClass         1 Audio
          bInterfaceSubClass      1 Control Device
          bInterfaceProtocol      0 
          iInterface              5 HP Webcam HD-2200
          AudioControl Interface Descriptor:
            bLength                 9
            bDescriptorType        36
            bDescriptorSubtype      1 (HEADER)
            bcdADC               1.00
            wTotalLength           38
            bInCollection           1
            baInterfaceNr( 0)       3
          AudioControl Interface Descriptor:
            bLength                12
            bDescriptorType        36
            bDescriptorSubtype      2 (INPUT_TERMINAL)
            bTerminalID             1
            wTerminalType      0x0201 Microphone
            bAssocTerminal          0
            bNrChannels             1
            wChannelConfig     0x0000
            iChannelNames           0 
            iTerminal               0 
          AudioControl Interface Descriptor:
            bLength                 8
            bDescriptorType        36
            bDescriptorSubtype      6 (FEATURE_UNIT)
            bUnitID                 2
            bSourceID               1
            bControlSize            1
            bmaControls( 0)      0x03
              Mute
              Volume
            iFeature                0 
          AudioControl Interface Descriptor:
            bLength                 9
            bDescriptorType        36
            bDescriptorSubtype      3 (OUTPUT_TERMINAL)
            bTerminalID             3
            wTerminalType      0x0101 USB Streaming
            bAssocTerminal          1
            bSourceID               2
            iTerminal               0 
        Interface Descriptor:
          bLength                 9
          bDescriptorType         4
          bInterfaceNumber        3
          bAlternateSetting       0
          bNumEndpoints           0
          bInterfaceClass         1 Audio
          bInterfaceSubClass      2 Streaming
          bInterfaceProtocol      0 
          iInterface              0 
        Interface Descriptor:
          bLength                 9
          bDescriptorType         4
          bInterfaceNumber        3
          bAlternateSetting       1
          bNumEndpoints           1
          bInterfaceClass         1 Audio
          bInterfaceSubClass      2 Streaming
          bInterfaceProtocol      0 
          iInterface              0 
          AudioStreaming Interface Descriptor:
            bLength                 7
            bDescriptorType        36
            bDescriptorSubtype      1 (AS_GENERAL)
            bTerminalLink           3
            bDelay                  1 frames
            wFormatTag              1 PCM
          AudioStreaming Interface Descriptor:
            bLength                11
            bDescriptorType        36
            bDescriptorSubtype      2 (FORMAT_TYPE)
            bFormatType             1 (FORMAT_TYPE_I)
            bNrChannels             1
            bSubframeSize           2
            bBitResolution         16
            bSamFreqType            1 Discrete
            tSamFreq[ 0]         8000
          Endpoint Descriptor:
            bLength                 9
            bDescriptorType         5
            bEndpointAddress     0x83  EP 3 IN
            bmAttributes            5
              Transfer Type            Isochronous
              Synch Type               Asynchronous
              Usage Type               Data
            wMaxPacketSize     0x0010  1x 16 bytes
            bInterval               4
            bRefresh                0
            bSynchAddress           0
            AudioControl Endpoint Descriptor:
              bLength                 7
              bDescriptorType        37
              bDescriptorSubtype      1 (EP_GENERAL)
              bmAttributes         0x01
                Sampling Frequency
              bLockDelayUnits         0 Undefined
              wLockDelay              0 Undefined
        Interface Descriptor:
          bLength                 9
          bDescriptorType         4
          bInterfaceNumber        3
          bAlternateSetting       2
          bNumEndpoints           1
          bInterfaceClass         1 Audio
          bInterfaceSubClass      2 Streaming
          bInterfaceProtocol      0 
          iInterface              0 
          AudioStreaming Interface Descriptor:
            bLength                 7
            bDescriptorType        36
            bDescriptorSubtype      1 (AS_GENERAL)
            bTerminalLink           3
            bDelay                  1 frames
            wFormatTag              1 PCM
          AudioStreaming Interface Descriptor:
            bLength                11
            bDescriptorType        36
            bDescriptorSubtype      2 (FORMAT_TYPE)
            bFormatType             1 (FORMAT_TYPE_I)
            bNrChannels             1
            bSubframeSize           2
            bBitResolution         16
            bSamFreqType            1 Discrete
            tSamFreq[ 0]        16000
          Endpoint Descriptor:
            bLength                 9
            bDescriptorType         5
            bEndpointAddress     0x83  EP 3 IN
            bmAttributes            5
              Transfer Type            Isochronous
              Synch Type               Asynchronous
              Usage Type               Data
            wMaxPacketSize     0x0020  1x 32 bytes
            bInterval               4
            bRefresh                0
            bSynchAddress           0
            AudioControl Endpoint Descriptor:
              bLength                 7
              bDescriptorType        37
              bDescriptorSubtype      1 (EP_GENERAL)
              bmAttributes         0x01
                Sampling Frequency
              bLockDelayUnits         0 Undefined
              wLockDelay              0 Undefined
        Interface Descriptor:
          bLength                 9
          bDescriptorType         4
          bInterfaceNumber        3
          bAlternateSetting       3
          bNumEndpoints           1
          bInterfaceClass         1 Audio
          bInterfaceSubClass      2 Streaming
          bInterfaceProtocol      0 
          iInterface              0 
          AudioStreaming Interface Descriptor:
            bLength                 7
            bDescriptorType        36
            bDescriptorSubtype      1 (AS_GENERAL)
            bTerminalLink           3
            bDelay                  1 frames
            wFormatTag              1 PCM
          AudioStreaming Interface Descriptor:
            bLength                11
            bDescriptorType        36
            bDescriptorSubtype      2 (FORMAT_TYPE)
            bFormatType             1 (FORMAT_TYPE_I)
            bNrChannels             1
            bSubframeSize           2
            bBitResolution         16
            bSamFreqType            1 Discrete
            tSamFreq[ 0]        44100
          Endpoint Descriptor:
            bLength                 9
            bDescriptorType         5
            bEndpointAddress     0x83  EP 3 IN
            bmAttributes            5
              Transfer Type            Isochronous
              Synch Type               Asynchronous
              Usage Type               Data
            wMaxPacketSize     0x005a  1x 90 bytes
            bInterval               4
            bRefresh                0
            bSynchAddress           0
            AudioControl Endpoint Descriptor:
              bLength                 7
              bDescriptorType        37
              bDescriptorSubtype      1 (EP_GENERAL)
              bmAttributes         0x01
                Sampling Frequency
              bLockDelayUnits         0 Undefined
              wLockDelay              0 Undefined
        Interface Descriptor:
          bLength                 9
          bDescriptorType         4
          bInterfaceNumber        3
          bAlternateSetting       4
          bNumEndpoints           1
          bInterfaceClass         1 Audio
          bInterfaceSubClass      2 Streaming
          bInterfaceProtocol      0 
          iInterface              0 
          AudioStreaming Interface Descriptor:
            bLength                 7
            bDescriptorType        36
            bDescriptorSubtype      1 (AS_GENERAL)
            bTerminalLink           3
            bDelay                  1 frames
            wFormatTag              1 PCM
          AudioStreaming Interface Descriptor:
            bLength                11
            bDescriptorType        36
            bDescriptorSubtype      2 (FORMAT_TYPE)
            bFormatType             1 (FORMAT_TYPE_I)
            bNrChannels             1
            bSubframeSize           2
            bBitResolution         16
            bSamFreqType            1 Discrete
            tSamFreq[ 0]        48000
          Endpoint Descriptor:
            bLength                 9
            bDescriptorType         5
            bEndpointAddress     0x83  EP 3 IN
            bmAttributes            5
              Transfer Type            Isochronous
              Synch Type               Asynchronous
              Usage Type               Data
            wMaxPacketSize     0x0060  1x 96 bytes
            bInterval               4
            bRefresh                0
            bSynchAddress           0
            AudioControl Endpoint Descriptor:
              bLength                 7
              bDescriptorType        37
              bDescriptorSubtype      1 (EP_GENERAL)
              bmAttributes         0x01
                Sampling Frequency
              bLockDelayUnits         0 Undefined
              wLockDelay              0 Undefined
    Device Qualifier (for other device speed):
      bLength                10
      bDescriptorType         6
      bcdUSB               2.00
      bDeviceClass          239 Miscellaneous Device
      bDeviceSubClass         2 ?
      bDeviceProtocol         1 Interface Association
      bMaxPacketSize0        64
      bNumConfigurations      1
    Device Status:     0x0000
      (Bus Powered)
    
    Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
    Device Descriptor:
      bLength                18
      bDescriptorType         1
      bcdUSB               2.00
      bDeviceClass            9 Hub
      bDeviceSubClass         0 Unused
      bDeviceProtocol         0 Full speed (or root) hub
      bMaxPacketSize0        64
      idVendor           0x1d6b Linux Foundation
      idProduct          0x0002 2.0 root hub
      bcdDevice            2.06
      iManufacturer           3 Linux 2.6.32-5-686 ehci_hcd
      iProduct                2 EHCI Host Controller
      iSerial                 1 0000:00:1d.7
      bNumConfigurations      1
      Configuration Descriptor:
        bLength                 9
        bDescriptorType         2
        wTotalLength           25
        bNumInterfaces          1
        bConfigurationValue     1
        iConfiguration          0 
        bmAttributes         0xe0
          Self Powered
          Remote Wakeup
        MaxPower                0mA
        Interface Descriptor:
          bLength                 9
          bDescriptorType         4
          bInterfaceNumber        0
          bAlternateSetting       0
          bNumEndpoints           1
          bInterfaceClass         9 Hub
          bInterfaceSubClass      0 Unused
          bInterfaceProtocol      0 Full speed (or root) hub
          iInterface              0 
          Endpoint Descriptor:
            bLength                 7
            bDescriptorType         5
            bEndpointAddress     0x81  EP 1 IN
            bmAttributes            3
              Transfer Type            Interrupt
              Synch Type               None
              Usage Type               Data
            wMaxPacketSize     0x0004  1x 4 bytes
            bInterval              12
    Hub Descriptor:
      bLength              11
      bDescriptorType      41
      nNbrPorts             8
      wHubCharacteristic 0x000a
        No power switching (usb 1.0)
        Per-port overcurrent protection
      bPwrOn2PwrGood       10 * 2 milli seconds
      bHubContrCurrent      0 milli Ampere
      DeviceRemovable    0x00 0x00
      PortPwrCtrlMask    0xff 0xff
     Hub Port Status:
       Port 1: 0000.0503 highspeed power enable connect
       Port 2: 0000.0503 highspeed power enable connect
       Port 3: 0000.0503 highspeed power enable connect
       Port 4: 0000.0100 power
       Port 5: 0000.0100 power
       Port 6: 0000.0100 power
       Port 7: 0000.0503 highspeed power enable connect
       Port 8: 0000.0100 power
    Device Status:     0x0003
      Self Powered
      Remote Wakeup Enabled

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