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sound devices usb pre 2. usb 2 with 96k

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olaf＠klingt.org

15 Mar 2019 15 Mar '19

6:19 p.m.

Hey I got my hands on the sound devices usb pre 2. It works well in 48k out of the box. Because it should be also standard compliant for usb2 which would make it possible to work in 96k I wonder what would have to be done to make this possible. Where should i ask this question? best, olaf

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Chris Caudle

15 Mar 15 Mar

10:07 p.m.

On Fri, March 15, 2019 11:19 am, olaf(a)klingt.org wrote:

I got my hands on the sound devices usb pre 2.

...

Because it should be also standard compliant for usb2 which would make it possible to work in 96k I wonder what would have to be done to make this possible.

I think you will have to ask Sound Devices. This tech note seems to indicate that the device supports both class 1 and class 2, but it does not indicate you have to do anything to switch: https://www.sounddevices.com/tech-notes/high-sampling-rates-with-usbpre-2 If you look at the output of lsusb do you see multiple endpoints? Perhaps it exposes a class 1 and a class 2 endpoint simultaneously. -- Chris Caudle

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olaf＠klingt.org

11:20 p.m.

On 15/03/2019 21:06, Chris Caudle wrote:

On Fri, March 15, 2019 11:19 am, olaf(a)klingt.org wrote:

I got my hands on the sound devices usb pre 2.

...

Because it should be also standard compliant for usb2 which would make it possible to work in 96k I wonder what would have to be done to make this possible.

I think you will have to ask Sound Devices. This tech note seems to indicate that the device supports both class 1 and class 2, but it does not indicate you have to do anything to switch: https://www.sounddevices.com/tech-notes/high-sampling-rates-with-usbpre-2 If you look at the output of lsusb do you see multiple endpoints? Perhaps it exposes a class 1 and a class 2 endpoint simultaneously.

lsusb doesn't return much Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 005: ID 04e8:7301 Samsung Electronics Co., Ltd Bus 001 Device 004: ID 2232:1083 Silicon Motion Bus 001 Device 003: ID 8087:0a2b Intel Corp. Bus 001 Device 006: ID 0926:0202 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub so i tried lsusb -t lsusb -t /: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/6p, 5000M /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/12p, 480M |__ Port 1: Dev 6, If 3, Class=Human Interface Device, Driver=usbhid, 480M |__ Port 1: Dev 6, If 1, Class=Audio, Driver=snd-usb-audio, 480M |__ Port 1: Dev 6, If 2, Class=Audio, Driver=snd-usb-audio, 480M |__ Port 1: Dev 6, If 0, Class=Audio, Driver=snd-usb-audio, 480M |__ Port 6: Dev 3, If 0, Class=Wireless, Driver=btusb, 12M |__ Port 6: Dev 3, If 1, Class=Wireless, Driver=btusb, 12M |__ Port 7: Dev 4, If 0, Class=Video, Driver=uvcvideo, 480M |__ Port 7: Dev 4, If 1, Class=Video, Driver=uvcvideo, 480M |__ Port 8: Dev 5, If 0, Class=Vendor Specific Class, Driver=, 12M

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Chris Caudle

11:36 p.m.

On Fri, March 15, 2019 4:20 pm, olaf(a)klingt.org wrote:

so i tried lsusb -t lsusb -t /:Â Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/6p, 5000M /:Â Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/12p, 480M Â Â Â |__ Port 1: Dev 6, If 3, Class=Human Interface Device, Driver=usbhid, 480M Â Â Â |__ Port 1: Dev 6, If 1, Class=Audio, Driver=snd-usb-audio, 480M Â Â Â |__ Port 1: Dev 6, If 2, Class=Audio, Driver=snd-usb-audio, 480M Â Â Â |__ Port 1: Dev 6, If 0, Class=Audio, Driver=snd-usb-audio, 480M Â Â Â |__ Port 6: Dev 3, If 0, Class=Wireless, Driver=btusb, 12M Â Â Â |__ Port 6: Dev 3, If 1, Class=Wireless, Driver=btusb, 12M Â Â Â |__ Port 7: Dev 4, If 0, Class=Video, Driver=uvcvideo, 480M Â Â Â |__ Port 7: Dev 4, If 1, Class=Video, Driver=uvcvideo, 480M Â Â Â |__ Port 8: Dev 5, If 0, Class=Vendor Specific Class, Driver=, 12M

Bus 1 Dev 6 has three audio endpoints. Try lsusb -v -s 1:6 to show verbose output from just device 6 on bus 1. And then hopefully Clemens or someone similarly familiar with snd-usb-audio driver can help interpret. -- Chris Caudle

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olaf＠klingt.org

16 Mar 16 Mar

12:22 a.m.

On 15/03/2019 22:36, Chris Caudle wrote:

On Fri, March 15, 2019 4:20 pm, olaf(a)klingt.org wrote:

so i tried lsusb -t lsusb -t /:Â Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/6p, 5000M /:Â Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/12p, 480M Â Â Â |__ Port 1: Dev 6, If 3, Class=Human Interface Device, Driver=usbhid, 480M Â Â Â |__ Port 1: Dev 6, If 1, Class=Audio, Driver=snd-usb-audio, 480M Â Â Â |__ Port 1: Dev 6, If 2, Class=Audio, Driver=snd-usb-audio, 480M Â Â Â |__ Port 1: Dev 6, If 0, Class=Audio, Driver=snd-usb-audio, 480M Â Â Â |__ Port 6: Dev 3, If 0, Class=Wireless, Driver=btusb, 12M Â Â Â |__ Port 6: Dev 3, If 1, Class=Wireless, Driver=btusb, 12M Â Â Â |__ Port 7: Dev 4, If 0, Class=Video, Driver=uvcvideo, 480M Â Â Â |__ Port 7: Dev 4, If 1, Class=Video, Driver=uvcvideo, 480M Â Â Â |__ Port 8: Dev 5, If 0, Class=Vendor Specific Class, Driver=, 12M

Bus 1 Dev 6 has three audio endpoints. Try lsusb -v -s 1:6 to show verbose output from just device 6 on bus 1. And then hopefully Clemens or someone similarly familiar with snd-usb-audio driver can help interpret.

It seems that nothing over 48k is listed. Couldn't open device, some information will be missing Bus 001 Device 008: ID 0926:0202 Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 2.00 bDeviceClass 239 Miscellaneous Device bDeviceSubClass 2 bDeviceProtocol 1 Interface Association bMaxPacketSize0 64 idVendor 0x0926 idProduct 0x0202 bcdDevice 1.00 iManufacturer 1 iProduct 2 iSerial 3 bNumConfigurations 1 Configuration Descriptor: bLength 9 bDescriptorType 2 wTotalLength 0x018a bNumInterfaces 4 bConfigurationValue 1 iConfiguration 0 bmAttributes 0x80 (Bus Powered) MaxPower 480mA Interface Association: bLength 8 bDescriptorType 11 bFirstInterface 0 bInterfaceCount 3 bFunctionClass 1 Audio bFunctionSubClass 0 bFunctionProtocol 0 iFunction 0 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 0x0034 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 9 bDescriptorType 36 bDescriptorSubtype 3 (OUTPUT_TERMINAL) bTerminalID 2 wTerminalType 0x0301 Speaker bAssocTerminal 0 bSourceID 1 iTerminal 0 AudioControl Interface Descriptor: bLength 12 bDescriptorType 36 bDescriptorSubtype 2 (INPUT_TERMINAL) bTerminalID 3 wTerminalType 0x0602 Digital Audio Interface bAssocTerminal 0 bNrChannels 2 wChannelConfig 0x0003 Left Front (L) Right Front (R) iChannelNames 0 iTerminal 0 AudioControl Interface Descriptor: bLength 9 bDescriptorType 36 bDescriptorSubtype 3 (OUTPUT_TERMINAL) bTerminalID 4 wTerminalType 0x0101 USB Streaming bAssocTerminal 0 bSourceID 3 iTerminal 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 2 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 0x0001 PCM AudioStreaming Interface Descriptor: bLength 26 bDescriptorType 36 bDescriptorSubtype 2 (FORMAT_TYPE) bFormatType 1 (FORMAT_TYPE_I) bNrChannels 2 bSubframeSize 2 bBitResolution 16 bSamFreqType 6 Discrete tSamFreq[ 0] 8000 tSamFreq[ 1] 16000 tSamFreq[ 2] 24000 tSamFreq[ 3] 32000 tSamFreq[ 4] 44100 tSamFreq[ 5] 48000 Endpoint Descriptor: bLength 9 bDescriptorType 5 bEndpointAddress 0x06 EP 6 OUT bmAttributes 5 Transfer Type Isochronous Synch Type Asynchronous Usage Type Data wMaxPacketSize 0x0126 1x 294 bytes bInterval 4 bRefresh 0 bSynchAddress 129 AudioStreaming Endpoint Descriptor: bLength 7 bDescriptorType 37 bDescriptorSubtype 1 (EP_GENERAL) bmAttributes 0x01 Sampling Frequency bLockDelayUnits 2 Decoded PCM samples wLockDelay 0x0000 Endpoint Descriptor: bLength 9 bDescriptorType 5 bEndpointAddress 0x81 EP 1 IN bmAttributes 1 Transfer Type Isochronous Synch Type None Usage Type Data wMaxPacketSize 0x0003 1x 3 bytes bInterval 4 bRefresh 5 bSynchAddress 0 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 1 bAlternateSetting 2 bNumEndpoints 2 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 0x0001 PCM AudioStreaming Interface Descriptor: bLength 26 bDescriptorType 36 bDescriptorSubtype 2 (FORMAT_TYPE) bFormatType 1 (FORMAT_TYPE_I) bNrChannels 2 bSubframeSize 3 bBitResolution 24 bSamFreqType 6 Discrete tSamFreq[ 0] 8000 tSamFreq[ 1] 16000 tSamFreq[ 2] 24000 tSamFreq[ 3] 32000 tSamFreq[ 4] 44100 tSamFreq[ 5] 48000 Endpoint Descriptor: bLength 9 bDescriptorType 5 bEndpointAddress 0x06 EP 6 OUT bmAttributes 5 Transfer Type Isochronous Synch Type Asynchronous Usage Type Data wMaxPacketSize 0x0126 1x 294 bytes bInterval 4 bRefresh 0 bSynchAddress 129 AudioStreaming Endpoint Descriptor: bLength 7 bDescriptorType 37 bDescriptorSubtype 1 (EP_GENERAL) bmAttributes 0x01 Sampling Frequency bLockDelayUnits 2 Decoded PCM samples wLockDelay 0x0000 Endpoint Descriptor: bLength 9 bDescriptorType 5 bEndpointAddress 0x81 EP 1 IN bmAttributes 1 Transfer Type Isochronous Synch Type None Usage Type Data wMaxPacketSize 0x0003 1x 3 bytes bInterval 4 bRefresh 5 bSynchAddress 0 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 1 bAlternateSetting 3 bNumEndpoints 2 bInterfaceClass 255 Vendor Specific Class bInterfaceSubClass 0 bInterfaceProtocol 0 iInterface 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x85 EP 5 IN bmAttributes 5 Transfer Type Isochronous Synch Type Asynchronous Usage Type Data wMaxPacketSize 0x0126 1x 294 bytes bInterval 1 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x06 EP 6 OUT bmAttributes 5 Transfer Type Isochronous Synch Type Asynchronous Usage Type Data wMaxPacketSize 0x0126 1x 294 bytes bInterval 1 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 1 frames wFormatTag 0x0001 PCM AudioStreaming Interface Descriptor: bLength 26 bDescriptorType 36 bDescriptorSubtype 2 (FORMAT_TYPE) bFormatType 1 (FORMAT_TYPE_I) bNrChannels 2 bSubframeSize 2 bBitResolution 16 bSamFreqType 6 Discrete tSamFreq[ 0] 8000 tSamFreq[ 1] 16000 tSamFreq[ 2] 24000 tSamFreq[ 3] 32000 tSamFreq[ 4] 44100 tSamFreq[ 5] 48000 Endpoint Descriptor: bLength 9 bDescriptorType 5 bEndpointAddress 0x85 EP 5 IN bmAttributes 5 Transfer Type Isochronous Synch Type Asynchronous Usage Type Data wMaxPacketSize 0x0126 1x 294 bytes bInterval 4 bRefresh 0 bSynchAddress 0 AudioStreaming Endpoint Descriptor: bLength 7 bDescriptorType 37 bDescriptorSubtype 1 (EP_GENERAL) bmAttributes 0x01 Sampling Frequency bLockDelayUnits 2 Decoded PCM samples wLockDelay 0x0000 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 2 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 4 bDelay 1 frames wFormatTag 0x0001 PCM AudioStreaming Interface Descriptor: bLength 26 bDescriptorType 36 bDescriptorSubtype 2 (FORMAT_TYPE) bFormatType 1 (FORMAT_TYPE_I) bNrChannels 2 bSubframeSize 3 bBitResolution 24 bSamFreqType 6 Discrete tSamFreq[ 0] 8000 tSamFreq[ 1] 16000 tSamFreq[ 2] 24000 tSamFreq[ 3] 32000 tSamFreq[ 4] 44100 tSamFreq[ 5] 48000 Endpoint Descriptor: bLength 9 bDescriptorType 5 bEndpointAddress 0x85 EP 5 IN bmAttributes 5 Transfer Type Isochronous Synch Type Asynchronous Usage Type Data wMaxPacketSize 0x0126 1x 294 bytes bInterval 4 bRefresh 0 bSynchAddress 0 AudioStreaming Endpoint Descriptor: bLength 7 bDescriptorType 37 bDescriptorSubtype 1 (EP_GENERAL) bmAttributes 0x01 Sampling Frequency bLockDelayUnits 2 Decoded PCM samples wLockDelay 0x0000 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 3 bAlternateSetting 0 bNumEndpoints 1 bInterfaceClass 3 Human Interface Device bInterfaceSubClass 0 bInterfaceProtocol 0 iInterface 0 HID Device Descriptor: bLength 9 bDescriptorType 33 bcdHID 1.01 bCountryCode 0 Not supported bNumDescriptors 1 bDescriptorType 34 Report wDescriptorLength 66 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 0x0040 1x 64 bytes bInterval 4

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Chris Caudle
olaf＠klingt.org