I have a problem with usb audio on 2.4 where the driver doesn't detect
the device capabilities right.
I've tested two usb audio devices on my target computer (see info) and
they report in dmesg and with ioctls that they don't support any other
sample rates than 44100 and 48000.
On my host (x86 kernel 2.6) computer they report that the device does
indeed support both 8000 and 16000 sample rates (which I'm after) and
another format, AFMT_MU_LAW.
Does anyone have a clue how I can around this?
Below are detailed sections with output from my soundinfo program (both
computers), dmesg (2.4 mipsel only) and lsusb -v (2.4 mipsel only).
General Info about "faulty" machine:
------------------------------------
Linux version 2.4.30
ARCH: mipsel
USB is in PIO mode
General Info about "ok" machine:
------------------------------------
Linux version 2.6.18
ARCH: x86
USB is in DMA mode
Soundinfo output:
----------------
I've written a small program to determine what the capabilities are on
sounddevices and the output on the 2.4.30 (mipsel) is:
sinfo: Gathering info about /dev/audio1
Formats (0x0007f9f8) supported:
AFMT_U8
AFMT_S8
AFMT_S16_LE
AFMT_S16_BE
AFMT_U16_LE
AFMT_U16_BE
SNDCTL_DSP_GETCAPS (0x00003700) supported:
DSP_CAP_DUPLEX
DSP_CAP_REATIME
DSP_CAP_BATCH
DSP_CAP_TRIGGER
DSP_CAP_MMAP
SNDCTL_DSP_SPEED supporting:
4000 not supported
8000 not supported
11025 not supported
16000 not supported
22050 not supported
32000 not supported
44100
48000
96000 not supported
192000 not supported
SNDCTL_DSP_SAMPLESIZE supporting:
8
16
32
64
The same device on x86 linux 2.6 is:
sinfo: Gathering info about /dev/audio2
Formats (0x000001f9) supported:
AFMT_MU_LAW
AFMT_U8
AFMT_S8
AFMT_S16_LE
AFMT_S16_BE
AFMT_U16_LE
AFMT_U16_BE
SNDCTL_DSP_GETCAPS (0x00003301) supported:
DSP_CAP_DUPLEX
DSP_CAP_REATIME
DSP_CAP_TRIGGER
DSP_CAP_MMAP
SNDCTL_DSP_SPEED supporting:
4000
8000
11025
16000
22050
32000
44100
48000
96000
192000
SNDCTL_DSP_SAMPLESIZE supporting:
8
16
32
64
Output of dmesg:
----------------
usbaudio: device 3 audiocontrol interface 0 has 1 input and 1 output
AudioStreaming interfaces
usbaudio: device 3 interface 2 altsetting 1 channels 1 framesize 2
configured
usbaudio: valid input sample rate 48000
usbaudio: valid input sample rate 44100
usbaudio: device 3 interface 2 altsetting 1: format 0x00000010 sratelo
44100 sratehi 48000 attributes 0x01
usbaudio: device 3 interface 1 altsetting 0 does not have an endpoint
usbaudio: device 3 interface 1 altsetting 1 channels 2 framesize 2
configured
usbaudio: valid output sample rate 48000
usbaudio: valid output sample rate 44100
usbaudio: device 3 interface 1 altsetting 1: format 0x01000010 sratelo
44100 sratehi 48000 attributes 0x01
usbaudio: registered dsp 14,19
usbaudio: constructing mixer for Terminal 6 type 0x0301
usbaudio: registered mixer 14,16
usbaudio: constructing mixer for Terminal 7 type 0x0101
usbaudio: registered mixer 14,32
usb_audio_parsecontrol: usb_audio_state at 87f8aca0
Output of lsusb:
----------------
Bus 001 Device 001: ID 0000:0000
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 9 Hub
bDeviceSubClass 0 Unused
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x0000
idProduct 0x0000
bcdDevice 0.00
iManufacturer 0
iProduct 2 USB OHCI Root Hub
iSerial 1 b4020000
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 25
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x40
(Missing must-be-set bit!)
Self Powered
MaxPower 0mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 9 Hub
bInterfaceSubClass 0 Unused
bInterfaceProtocol 0
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 0x0010
Ganged power switching
No overcurrent protection
bPwrOn2PwrGood 2 * 2 milli seconds
bHubContrCurrent 0 milli Ampere
DeviceRemovable 0x00
PortPwrCtrlMask 0xff
Hub Port Status:
Port 1: 0000.0103 power enable connect
Port 2: 0000.0100 power
Device Status: 0x0001
Self Powered
Bus 001 Device 003: ID 026a:9001
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x026a
idProduct 0x9001
bcdDevice 1.00
iManufacturer 0
iProduct 0
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 224
bNumInterfaces 4
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xa0
(Bus Powered)
Remote Wakeup
MaxPower 100mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 0
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 71
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 2
wChannelConfig 0x0003
Left Front (L)
Right Front (R)
iChannelNames 0
iTerminal 0
AudioControl Interface Descriptor:
bLength 12
bDescriptorType 36
bDescriptorSubtype 2 (INPUT_TERMINAL)
bTerminalID 2
wTerminalType 0x0201 Microphone
bAssocTerminal 0
bNrChannels 1
wChannelConfig 0x0001
Left Front (L)
iChannelNames 0
iTerminal 0
AudioControl Interface Descriptor:
bLength 9
bDescriptorType 36
bDescriptorSubtype 3 (OUTPUT_TERMINAL)
bTerminalID 6
wTerminalType 0x0301 Speaker
bAssocTerminal 0
bSourceID 9
iTerminal 0
AudioControl Interface Descriptor:
bLength 9
bDescriptorType 36
bDescriptorSubtype 3 (OUTPUT_TERMINAL)
bTerminalID 7
wTerminalType 0x0101 USB Streaming
bAssocTerminal 0
bSourceID 10
iTerminal 0
AudioControl Interface Descriptor:
bLength 10
bDescriptorType 36
bDescriptorSubtype 6 (FEATURE_UNIT)
bUnitID 9
bSourceID 1
bControlSize 1
bmaControls( 0) 0x01
Mute
bmaControls( 1) 0x02
Volume
bmaControls( 2) 0x02
Volume
iFeature 0
AudioControl Interface Descriptor:
bLength 9
bDescriptorType 36
bDescriptorSubtype 6 (FEATURE_UNIT)
bUnitID 10
bSourceID 2
bControlSize 1
bmaControls( 0) 0x43
Mute
Volume
Automatic Gain
bmaControls( 1) 0x00
iFeature 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 0
iInterface 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
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 1
bDelay 1 frames
wFormatTag 1 PCM
AudioStreaming Interface Descriptor:
bLength 14
bDescriptorType 36
bDescriptorSubtype 2 (FORMAT_TYPE)
bFormatType 1 (FORMAT_TYPE_I)
bNrChannels 2
bSubframeSize 2
bBitResolution 16
bSamFreqType 2 Discrete
tSamFreq[ 0] 48000
tSamFreq[ 1] 44100
Endpoint Descriptor:
bLength 9
bDescriptorType 5
bEndpointAddress 0x01 EP 1 OUT
bmAttributes 9
Transfer Type Isochronous
Synch Type Adaptive
Usage Type Data
wMaxPacketSize 0x00c8 1x 200 bytes
bInterval 1
bRefresh 0
bSynchAddress 0
AudioControl Endpoint Descriptor:
bLength 7
bDescriptorType 37
bDescriptorSubtype 1 (EP_GENERAL)
bmAttributes 0x01
Sampling Frequency
bLockDelayUnits 1 Milliseconds
wLockDelay 1 Milliseconds
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 2
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 0
iInterface 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 2
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 7
bDelay 1 frames
wFormatTag 1 PCM
AudioStreaming Interface Descriptor:
bLength 14
bDescriptorType 36
bDescriptorSubtype 2 (FORMAT_TYPE)
bFormatType 1 (FORMAT_TYPE_I)
bNrChannels 1
bSubframeSize 2
bBitResolution 16
bSamFreqType 2 Discrete
tSamFreq[ 0] 48000
tSamFreq[ 1] 44100
Endpoint Descriptor:
bLength 9
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 5
Transfer Type Isochronous
Synch Type Asynchronous
Usage Type Data
wMaxPacketSize 0x0064 1x 100 bytes
bInterval 1
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 0
bNumEndpoints 1
bInterfaceClass 3 Human Interface Devices
bInterfaceSubClass 0 No Subclass
bInterfaceProtocol 0 None
iInterface 0
HID Device Descriptor:
bLength 9
bDescriptorType 33
bcdHID 1.00
bCountryCode 0 Not supported
bNumDescriptors 1
bDescriptorType 34 Report
wDescriptorLength 50
Report Descriptor: (length is 50)
Item(Global): Usage Page, data= [ 0x0c ] 12
Consumer
Item(Local ): Usage, data= [ 0x01 ] 1
Consumer Control
Item(Main ): Collection, data= [ 0x01 ] 1
Application
Item(Global): Logical Minimum, data= [ 0x00 ] 0
Item(Global): Logical Maximum, data= [ 0x01 ] 1
Item(Local ): Usage, data= [ 0xe9 ] 233
Volume Increment
Item(Local ): Usage, data= [ 0xea ] 234
Volume Decrement
Item(Global): Report Size, data= [ 0x01 ] 1
Item(Global): Report Count, data= [ 0x02 ] 2
Item(Main ): Input, data= [ 0x02 ] 2
Data Variable Absolute No_Wrap Linear
Preferred_State No_Null_Position
Non_Volatile Bitfield
Item(Local ): Usage, data= [ 0xe2 ] 226
Mute
Item(Local ): Usage, data= [ 0x00 ] 0
Unassigned
Item(Main ): Input, data= [ 0x06 ] 6
Data Variable Relative No_Wrap Linear
Preferred_State No_Null_Position
Non_Volatile Bitfield
Item(Local ): Usage, data= [ 0x00 ] 0
Unassigned
Item(Global): Report Count, data= [ 0x04 ] 4
Item(Main ): Input, data= [ 0x02 ] 2
Data Variable Absolute No_Wrap Linear
Preferred_State No_Null_Position
Non_Volatile Bitfield
Item(Global): Logical Maximum, data= [ 0xff 0x00 ] 255
Item(Local ): Usage, data= [ 0x00 ] 0
Unassigned
Item(Global): Report Size, data= [ 0x08 ] 8
Item(Global): Report Count, data= [ 0x03 ] 3
Item(Main ): Input, data= [ 0x02 ] 2
Data Variable Absolute No_Wrap Linear
Preferred_State No_Null_Position
Non_Volatile Bitfield
Item(Local ): Usage, data= [ 0x00 ] 0
Unassigned
Item(Global): Report Count, data= [ 0x04 ] 4
Item(Main ): Output, data= [ 0x02 ] 2
Data Variable Absolute No_Wrap Linear
Preferred_State No_Null_Position
Non_Volatile Bitfield
Item(Main ): End Collection, data=none
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0004 1x 4 bytes
bInterval 32
Device Status: 0x0000
(Bus Powered)
-------------------------------------------------------------------------
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