Thanks for the quick answer.
Here are the requested details:
============================
stream0:
Plantronics Plantronics C720 at usb-0000:00:12.0-1, full speed : USB Audio
Playback:
Status: Stop
Interface 1
Altset 1
Format: S16_LE
Channels: 2
Endpoint: 3 OUT (NONE)
Rates: 16000, 48000
Capture:
Status: Stop
Interface 2
Altset 1
Format: S16_LE
Channels: 1
Endpoint: 3 IN (NONE)
Rates: 16000
============================
lsusb -v:
Bus 002 Device 002: ID 047f:010a Plantronics, Inc.
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x047f Plantronics, Inc.
idProduct 0x010a
bcdDevice 0.41
iManufacturer 1 Plantronics
iProduct 2 Plantronics C720
iSerial 3 90cee226da877041a974763f72f2a0bb
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 269
bNumInterfaces 4
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xc0
Self Powered
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 119
bInCollection 2
baInterfaceNr( 0) 1
baInterfaceNr( 1) 2
AudioControl Interface Descriptor:
bLength 12
bDescriptorType 36
bDescriptorSubtype 2 (INPUT_TERMINAL)
bTerminalID 1
wTerminalType 0x0201 Microphone
bAssocTerminal 7
bNrChannels 1
wChannelConfig 0x0004
Center Front (C)
iChannelNames 0
iTerminal 0
AudioControl Interface Descriptor:
bLength 11
bDescriptorType 36
bDescriptorSubtype 6 (FEATURE_UNIT)
bUnitID 2
bSourceID 1
bControlSize 2
bmaControls( 0) 0x01
bmaControls( 0) 0x00
Mute
bmaControls( 1) 0x02
bmaControls( 1) 0x00
Volume
iFeature 0
AudioControl Interface Descriptor:
bLength 7
bDescriptorType 36
bDescriptorSubtype 5 (SELECTOR_UNIT)
bUnitID 3
bNrInPins 1
baSource( 0) 2
iSelector 0
AudioControl Interface Descriptor:
bLength 9
bDescriptorType 36
bDescriptorSubtype 3 (OUTPUT_TERMINAL)
bTerminalID 4
wTerminalType 0x0101 USB Streaming
bAssocTerminal 5
bSourceID 3
iTerminal 0
AudioControl Interface Descriptor:
bLength 12
bDescriptorType 36
bDescriptorSubtype 2 (INPUT_TERMINAL)
bTerminalID 5
wTerminalType 0x0101 USB Streaming
bAssocTerminal 4
bNrChannels 2
wChannelConfig 0x0003
Left Front (L)
Right Front (R)
iChannelNames 0
iTerminal 0
AudioControl Interface Descriptor:
bLength 13
bDescriptorType 36
bDescriptorSubtype 6 (FEATURE_UNIT)
bUnitID 6
bSourceID 9
bControlSize 2
bmaControls( 0) 0x01
bmaControls( 0) 0x00
Mute
bmaControls( 1) 0x02
bmaControls( 1) 0x00
Volume
bmaControls( 2) 0x02
bmaControls( 2) 0x00
Volume
iFeature 0
AudioControl Interface Descriptor:
bLength 9
bDescriptorType 36
bDescriptorSubtype 3 (OUTPUT_TERMINAL)
bTerminalID 7
wTerminalType 0x0301 Speaker
bAssocTerminal 1
bSourceID 6
iTerminal 0
AudioControl Interface Descriptor:
bLength 12
bDescriptorType 36
bDescriptorSubtype 2 (INPUT_TERMINAL)
bTerminalID 10
wTerminalType 0x0201 Microphone
bAssocTerminal 0
bNrChannels 1
wChannelConfig 0x0004
Center Front (C)
iChannelNames 0
iTerminal 6 Sidetone
AudioControl Interface Descriptor:
bLength 11
bDescriptorType 36
bDescriptorSubtype 6 (FEATURE_UNIT)
bUnitID 8
bSourceID 10
bControlSize 2
bmaControls( 0) 0x01
bmaControls( 0) 0x00
Mute
bmaControls( 1) 0x02
bmaControls( 1) 0x00
Volume
iFeature 0
AudioControl Interface Descriptor:
bLength 13
bDescriptorType 36
bDescriptorSubtype 4 (MIXER_UNIT)
bUnitID 9
bNrInPins 2
baSourceID( 0) 5
baSourceID( 1) 8
bNrChannels 2
wChannelConfig 0x0003
Left Front (L)
Right Front (R)
iChannelNames 0
bmControls 0x00
iMixer 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 5
bDelay 0 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] 16000
tSamFreq[ 1] 48000
** UNRECOGNIZED: 07 25 01 81 02 00 00
Endpoint Descriptor:
bLength 9
bDescriptorType 5
bEndpointAddress 0x03 EP 3 OUT
bmAttributes 1
Transfer Type Isochronous
Synch Type None
Usage Type Data
wMaxPacketSize 0x00c0 1x 192 bytes
bInterval 1
bRefresh 0
bSynchAddress 0
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 4
bDelay 0 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
** UNRECOGNIZED: 07 25 01 00 02 00 00
Endpoint Descriptor:
bLength 9
bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 1
Transfer Type Isochronous
Synch Type None
Usage Type Data
wMaxPacketSize 0x0020 1x 32 bytes
bInterval 1
bRefresh 0
bSynchAddress 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 3
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 788
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 0x0040 1x 64 bytes
bInterval 1
Device Status: 0x0001
Self Powered
============================
The device is shipping, but usually with the default firmware, it works OK. There is a
utility to update the firmware, and only the "latest and greatest" is available
then. So if we get a correction, it could make its way to the end-user.
I'll ask if I can get some more support from Plantronics
Thanks in advance
- Yves
On 22/04/2013 18:57, Daniel Mack wrote:
Hi Yves,
On 22.04.2013 18:20, Yves G wrote:
I work with a partner who is a USB headset manufacturer.
Recently, they made a change to the firmware of one of their USB
headsets and now the default playing sampling rate is 16kHz instead of
48kHz. This device supports only 16kHz and 48kHz for output sample rates.
Now, when using alsa, we can't play anything on this device but 16kHz
samples.
Previously, when the device's default output sample frequency was 48kHz,
everything seemed OK (though I must admit that I did not try to play
16kHz samples then. And I can't downgrade the firmware so I can't do the
test)
I suspect there was always something wrong on the firmware side, and the
changed default just brought it to the surface.
We recorded USB packets and we compared Linux and Windows traces.
When under Windows, we can see that a USB packet to set the device
sampling rate is sent (even if the default sampling rate freq is already
48kHz. The USB packet is "Set Cur", "Endpoint=3-OUT
CS=SAMPLING_FREQ_CONTROL").
Please show the contents of /proc/asound/cardX/stream0.
When under Linux using Alsa, the message is never sent.
Maybe because the descriptors don't allow that. Please post the output
of 'lsusb -v'.
I have access to the firmware engineer at the partner's, so if there is
something to correct or implement in the firmware, this may be doable.
That's good. Is this device already shipping or can we expect the
firmware to get fixed before that happens?
Thanks,
Daniel
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