Hi Alf, On Mon, Jan 13, 2025 at 10:26:14PM +0700, Alf Nilsson wrote: > Hello Laurent, > > The commit: > https://github.com/torvalds/linux/commit/ > 3dd075fe8ebbc6fcbf998f81a75b8c4b159a6195 > > Broke usage for the off-brand web camera: 1b3f:2247 as it uses bUnitID 5 2 > times. > > Reverting back to 6.1.119 enables/allows the web camera again. This has been reported already, see https://lore.kernel.org/linux-media/20250113185059.GA30724@xxxxxxxxxxxxxxxxxxxxxxxxxx/T/#t > There is something fishy with the webcam, due to the output from lsusb -v > -d 1b3f:2247 > > Shows the following output around a bUnitID: > VideoControl Interface Descriptor: > bLength 11 > bDescriptorType 36 > bDescriptorSubtype 5 (PROCESSING_UNIT) > Warning: Descriptor too short > bUnitID 5 > bSourceID 4 > wMaxMultiplier 16384 > bControlSize 2 > bmControls 0x00000007 > Brightness > Contrast > Hue > iProcessing 0 > bmVideoStandards 0x1d > None > PAL - 625/50 > SECAM - 625/50 > NTSC - 625/50 > > When increasing the output from uvcvideo I got the following info that led me > to look at the commit. > > dmesg | tail -n 50 > [ 3448.687491] usbcore: deregistering interface driver uvcvideo > [ 3457.037788] usb 2-1: Found multiple Units with ID 5 > [ 3457.037881] usbcore: registered new interface driver uvcvideo > [ 4154.000409] usbcore: deregistering interface driver uvcvideo > [ 4160.118442] usb 2-1: Probing generic UVC device 1 > [ 4160.118609] usb 2-1: Found format MJPG little-endian (0x47504a4d) > [ 4160.118611] usb 2-1: - 1920x1080 (30.0 fps) > [ 4160.118612] usb 2-1: - 1440x1080 (30.0 fps) > [ 4160.118613] usb 2-1: - 1280x720 (30.0 fps) > [ 4160.118614] usb 2-1: - 800x600 (30.0 fps) > [ 4160.118615] usb 2-1: - 800x480 (30.0 fps) > [ 4160.118616] usb 2-1: - 720x480 (30.0 fps) > [ 4160.118617] usb 2-1: - 640x480 (30.0 fps) > [ 4160.118618] usb 2-1: - 640x360 (30.0 fps) > [ 4160.118619] usb 2-1: - 480x270 (30.0 fps) > [ 4160.118619] usb 2-1: - 320x240 (30.0 fps) > [ 4160.118620] usb 2-1: - 176x144 (30.0 fps) > [ 4160.118621] usb 2-1: Found format YUYV little-endian (0x56595559) > [ 4160.118622] usb 2-1: - 1280x720 (30.0 fps) > [ 4160.118623] usb 2-1: - 800x600 (30.0 fps) > [ 4160.118624] usb 2-1: - 800x480 (30.0 fps) > [ 4160.118624] usb 2-1: - 720x480 (30.0 fps) > [ 4160.118625] usb 2-1: - 640x480 (30.0 fps) > [ 4160.118626] usb 2-1: - 640x360 (30.0 fps) > [ 4160.118627] usb 2-1: - 480x270 (30.0 fps) > [ 4160.118628] usb 2-1: - 320x240 (30.0 fps) > [ 4160.118629] usb 2-1: - 176x144 (30.0 fps) > [ 4160.118631] usb 2-1: Found multiple Units with ID 5 This is the issue. There's a proposed fix in the link I mentioned above which you could try, but it's still under review and not ready to be merged yet. > [ 4160.118633] usb 2-1: Unable to parse UVC descriptors > [ 4160.118681] usbcore: registered new interface driver uvcvideo > > Booted the same computer in Windows just to see if the camera had broken, but > no, Windows 10 is more forgiving with the device. > > I have attached the full output of lsusb -v -d 1b3f:2247. > > It would be nice if there was a quirk available for this "almost correct" web > camera. > > Kind regards, > Alf Nilsson > > > Bus 002 Device 002: ID 1b3f:2247 Generalplus Technology Inc. GENERAL WEBCAM > Device Descriptor: > bLength 18 > bDescriptorType 1 > bcdUSB 2.00 > bDeviceClass 239 Miscellaneous Device > bDeviceSubClass 2 > bDeviceProtocol 1 Interface Association > bMaxPacketSize0 64 > idVendor 0x1b3f Generalplus Technology Inc. > idProduct 0x2247 > bcdDevice 1.00 > iManufacturer 1 GENERAL > iProduct 2 GENERAL WEBCAM > iSerial 0 > bNumConfigurations 1 > Configuration Descriptor: > bLength 9 > bDescriptorType 2 > wTotalLength 0x0495 > bNumInterfaces 4 > bConfigurationValue 1 > iConfiguration 0 > bmAttributes 0x80 > (Bus Powered) > MaxPower 100mA > Interface Association: > bLength 8 > bDescriptorType 11 > bFirstInterface 0 > bInterfaceCount 2 > bFunctionClass 14 Video > bFunctionSubClass 3 Video Interface Collection > bFunctionProtocol 0 > iFunction 4 GENERAL WEBCAM > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 0 > bAlternateSetting 0 > bNumEndpoints 1 > bInterfaceClass 14 Video > bInterfaceSubClass 1 Video Control > bInterfaceProtocol 0 > iInterface 4 GENERAL WEBCAM > VideoControl Interface Descriptor: > bLength 13 > bDescriptorType 36 > bDescriptorSubtype 1 (HEADER) > bcdUVC 1.00 > wTotalLength 0x006d > dwClockFrequency 6.000000MHz > bInCollection 1 > baInterfaceNr( 0) 1 > VideoControl Interface Descriptor: > bLength 18 > bDescriptorType 36 > bDescriptorSubtype 2 (INPUT_TERMINAL) > bTerminalID 1 > wTerminalType 0x0201 Camera Sensor > bAssocTerminal 0 > iTerminal 0 > wObjectiveFocalLengthMin 0 > wObjectiveFocalLengthMax 0 > wOcularFocalLength 0 > bControlSize 3 > bmControls 0x0000000a > Auto-Exposure Mode > Exposure Time (Absolute) > VideoControl Interface Descriptor: > bLength 11 > bDescriptorType 36 > bDescriptorSubtype 5 (PROCESSING_UNIT) > Warning: Descriptor too short > bUnitID 5 > bSourceID 4 > wMaxMultiplier 16384 > bControlSize 2 > bmControls 0x00000007 > Brightness > Contrast > Hue > iProcessing 0 > bmVideoStandards 0x1d > None > PAL - 625/50 > SECAM - 625/50 > NTSC - 625/50 > VideoControl Interface Descriptor: > bLength 29 > bDescriptorType 36 > bDescriptorSubtype 6 (EXTENSION_UNIT) > bUnitID 3 > guidExtensionCode {28f03370-6311-4a2e-ba2c-6890eb334016} > bNumControls 4 > bNrInPins 1 > baSourceID( 0) 2 > bControlSize 4 > bmControls( 0) 0x0f > bmControls( 1) 0x00 > bmControls( 2) 0x00 > bmControls( 3) 0x00 > iExtension 0 > VideoControl Interface Descriptor: > bLength 29 > bDescriptorType 36 > bDescriptorSubtype 6 (EXTENSION_UNIT) > bUnitID 4 > guidExtensionCode {63610682-5070-49ab-b8cc-b3855e8d221d} > bNumControls 20 > bNrInPins 1 > baSourceID( 0) 3 > bControlSize 4 > bmControls( 0) 0xff > bmControls( 1) 0xff > bmControls( 2) 0x71 > bmControls( 3) 0x00 > 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 0x83 EP 3 IN > bmAttributes 3 > Transfer Type Interrupt > Synch Type None > Usage Type Data > wMaxPacketSize 0x0040 1x 64 bytes > bInterval 32 > 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 0x02fa > bEndpointAddress 0x85 EP 5 IN > bmInfo 0 > bTerminalLink 5 > bStillCaptureMethod 2 > bTriggerSupport 1 > bTriggerUsage 0 > bControlSize 1 > bmaControls( 0) 0 > bmaControls( 1) 4 > VideoStreaming Interface Descriptor: > bLength 11 > bDescriptorType 36 > bDescriptorSubtype 6 (FORMAT_MJPEG) > bFormatIndex 1 > bNumFrameDescriptors 11 > bFlags 1 > Fixed-size samples: Yes > bDefaultFrameIndex 3 > bAspectRatioX 0 > bAspectRatioY 0 > bmInterlaceFlags 0x00 > Interlaced stream or variable: No > Fields per frame: 1 fields > Field 1 first: No > Field pattern: Field 1 only > bCopyProtect 0 > VideoStreaming Interface Descriptor: > bLength 30 > bDescriptorType 36 > bDescriptorSubtype 7 (FRAME_MJPEG) > bFrameIndex 1 > bmCapabilities 0x00 > Still image unsupported > wWidth 1920 > wHeight 1080 > dwMinBitRate 912384 > dwMaxBitRate 912384 > dwMaxVideoFrameBufferSize 614400 > dwDefaultFrameInterval 333333 > bFrameIntervalType 1 > dwFrameInterval( 0) 333333 > VideoStreaming Interface Descriptor: > bLength 30 > bDescriptorType 36 > bDescriptorSubtype 7 (FRAME_MJPEG) > bFrameIndex 2 > bmCapabilities 0x00 > Still image unsupported > wWidth 1440 > wHeight 1080 > dwMinBitRate 912384 > dwMaxBitRate 912384 > dwMaxVideoFrameBufferSize 614400 > dwDefaultFrameInterval 333333 > bFrameIntervalType 1 > dwFrameInterval( 0) 333333 > VideoStreaming Interface Descriptor: > bLength 30 > bDescriptorType 36 > bDescriptorSubtype 7 (FRAME_MJPEG) > bFrameIndex 3 > bmCapabilities 0x00 > Still image unsupported > wWidth 1280 > wHeight 720 > dwMinBitRate 912384 > dwMaxBitRate 912384 > dwMaxVideoFrameBufferSize 614400 > dwDefaultFrameInterval 333333 > bFrameIntervalType 1 > dwFrameInterval( 0) 333333 > VideoStreaming Interface Descriptor: > bLength 30 > bDescriptorType 36 > bDescriptorSubtype 7 (FRAME_MJPEG) > bFrameIndex 4 > bmCapabilities 0x00 > Still image unsupported > wWidth 800 > wHeight 600 > dwMinBitRate 912384 > dwMaxBitRate 912384 > dwMaxVideoFrameBufferSize 614400 > dwDefaultFrameInterval 333333 > bFrameIntervalType 1 > dwFrameInterval( 0) 333333 > VideoStreaming Interface Descriptor: > bLength 30 > bDescriptorType 36 > bDescriptorSubtype 7 (FRAME_MJPEG) > bFrameIndex 5 > bmCapabilities 0x00 > Still image unsupported > wWidth 800 > wHeight 480 > dwMinBitRate 912384 > dwMaxBitRate 912384 > dwMaxVideoFrameBufferSize 614400 > dwDefaultFrameInterval 333333 > bFrameIntervalType 1 > dwFrameInterval( 0) 333333 > VideoStreaming Interface Descriptor: > bLength 30 > bDescriptorType 36 > bDescriptorSubtype 7 (FRAME_MJPEG) > bFrameIndex 6 > bmCapabilities 0x00 > Still image unsupported > wWidth 720 > wHeight 480 > dwMinBitRate 912384 > dwMaxBitRate 912384 > dwMaxVideoFrameBufferSize 614400 > dwDefaultFrameInterval 333333 > bFrameIntervalType 1 > dwFrameInterval( 0) 333333 > VideoStreaming Interface Descriptor: > bLength 30 > bDescriptorType 36 > bDescriptorSubtype 7 (FRAME_MJPEG) > bFrameIndex 7 > bmCapabilities 0x00 > Still image unsupported > wWidth 640 > wHeight 480 > dwMinBitRate 912384 > dwMaxBitRate 912384 > dwMaxVideoFrameBufferSize 614400 > dwDefaultFrameInterval 333333 > bFrameIntervalType 1 > dwFrameInterval( 0) 333333 > VideoStreaming Interface Descriptor: > bLength 30 > bDescriptorType 36 > bDescriptorSubtype 7 (FRAME_MJPEG) > bFrameIndex 8 > bmCapabilities 0x00 > Still image unsupported > wWidth 640 > wHeight 360 > dwMinBitRate 912384 > dwMaxBitRate 912384 > dwMaxVideoFrameBufferSize 614400 > dwDefaultFrameInterval 333333 > bFrameIntervalType 1 > dwFrameInterval( 0) 333333 > VideoStreaming Interface Descriptor: > bLength 30 > bDescriptorType 36 > bDescriptorSubtype 7 (FRAME_MJPEG) > bFrameIndex 9 > bmCapabilities 0x00 > Still image unsupported > wWidth 480 > wHeight 270 > dwMinBitRate 912384 > dwMaxBitRate 912384 > dwMaxVideoFrameBufferSize 614400 > dwDefaultFrameInterval 333333 > bFrameIntervalType 1 > dwFrameInterval( 0) 333333 > VideoStreaming Interface Descriptor: > bLength 30 > bDescriptorType 36 > bDescriptorSubtype 7 (FRAME_MJPEG) > bFrameIndex 10 > bmCapabilities 0x00 > Still image unsupported > wWidth 320 > wHeight 240 > dwMinBitRate 912384 > dwMaxBitRate 912384 > dwMaxVideoFrameBufferSize 614400 > dwDefaultFrameInterval 333333 > bFrameIntervalType 1 > dwFrameInterval( 0) 333333 > VideoStreaming Interface Descriptor: > bLength 30 > bDescriptorType 36 > bDescriptorSubtype 7 (FRAME_MJPEG) > bFrameIndex 11 > bmCapabilities 0x00 > Still image unsupported > wWidth 176 > wHeight 144 > dwMinBitRate 912384 > dwMaxBitRate 912384 > dwMaxVideoFrameBufferSize 614400 > dwDefaultFrameInterval 333333 > bFrameIntervalType 1 > dwFrameInterval( 0) 333333 > VideoStreaming Interface Descriptor: > bLength 54 > bDescriptorType 36 > bDescriptorSubtype 3 (STILL_IMAGE_FRAME) > bEndpointAddress 0x00 EP 0 OUT > bNumImageSizePatterns 11 > wWidth( 0) 1920 > wHeight( 0) 1080 > wWidth( 1) 1440 > wHeight( 1) 1080 > wWidth( 2) 1280 > wHeight( 2) 720 > wWidth( 3) 800 > wHeight( 3) 600 > wWidth( 4) 800 > wHeight( 4) 480 > wWidth( 5) 720 > wHeight( 5) 480 > wWidth( 6) 640 > wHeight( 6) 480 > wWidth( 7) 640 > wHeight( 7) 360 > wWidth( 8) 480 > wHeight( 8) 270 > wWidth( 9) 320 > wHeight( 9) 240 > wWidth(10) 176 > wHeight(10) 144 > bNumCompressionPatterns 4 > bCompression( 0) 1 > bCompression( 1) 5 > bCompression( 2) 10 > bCompression( 3) 20 > 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 27 > bDescriptorType 36 > bDescriptorSubtype 4 (FORMAT_UNCOMPRESSED) > bFormatIndex 2 > bNumFrameDescriptors 9 > guidFormat {32595559-0000-0010-8000-00aa00389b71} > bBitsPerPixel 16 > bDefaultFrameIndex 1 > bAspectRatioX 0 > bAspectRatioY 0 > bmInterlaceFlags 0x00 > 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 30 > bDescriptorType 36 > bDescriptorSubtype 5 (FRAME_UNCOMPRESSED) > bFrameIndex 1 > bmCapabilities 0x00 > Still image unsupported > wWidth 1280 > wHeight 720 > dwMinBitRate 73728000 > dwMaxBitRate 147456000 > dwMaxVideoFrameBufferSize 1843200 > dwDefaultFrameInterval 333333 > bFrameIntervalType 1 > dwFrameInterval( 0) 333333 > VideoStreaming Interface Descriptor: > bLength 30 > bDescriptorType 36 > bDescriptorSubtype 5 (FRAME_UNCOMPRESSED) > bFrameIndex 2 > bmCapabilities 0x00 > Still image unsupported > wWidth 800 > wHeight 600 > dwMinBitRate 73728000 > dwMaxBitRate 147456000 > dwMaxVideoFrameBufferSize 960000 > dwDefaultFrameInterval 333333 > bFrameIntervalType 1 > dwFrameInterval( 0) 333333 > VideoStreaming Interface Descriptor: > bLength 30 > bDescriptorType 36 > bDescriptorSubtype 5 (FRAME_UNCOMPRESSED) > bFrameIndex 3 > bmCapabilities 0x00 > Still image unsupported > wWidth 800 > wHeight 480 > dwMinBitRate 73728000 > dwMaxBitRate 147456000 > dwMaxVideoFrameBufferSize 768000 > dwDefaultFrameInterval 333333 > bFrameIntervalType 1 > dwFrameInterval( 0) 333333 > VideoStreaming Interface Descriptor: > bLength 30 > bDescriptorType 36 > bDescriptorSubtype 5 (FRAME_UNCOMPRESSED) > bFrameIndex 4 > bmCapabilities 0x00 > Still image unsupported > wWidth 720 > wHeight 480 > dwMinBitRate 73728000 > dwMaxBitRate 147456000 > dwMaxVideoFrameBufferSize 691200 > dwDefaultFrameInterval 333333 > bFrameIntervalType 1 > dwFrameInterval( 0) 333333 > VideoStreaming Interface Descriptor: > bLength 30 > bDescriptorType 36 > bDescriptorSubtype 5 (FRAME_UNCOMPRESSED) > bFrameIndex 5 > bmCapabilities 0x00 > Still image unsupported > wWidth 640 > wHeight 480 > dwMinBitRate 73728000 > dwMaxBitRate 147456000 > dwMaxVideoFrameBufferSize 614400 > dwDefaultFrameInterval 333333 > bFrameIntervalType 1 > dwFrameInterval( 0) 333333 > VideoStreaming Interface Descriptor: > bLength 30 > bDescriptorType 36 > bDescriptorSubtype 5 (FRAME_UNCOMPRESSED) > bFrameIndex 6 > bmCapabilities 0x00 > Still image unsupported > wWidth 640 > wHeight 360 > dwMinBitRate 73728000 > dwMaxBitRate 147456000 > dwMaxVideoFrameBufferSize 460800 > dwDefaultFrameInterval 333333 > bFrameIntervalType 1 > dwFrameInterval( 0) 333333 > VideoStreaming Interface Descriptor: > bLength 30 > bDescriptorType 36 > bDescriptorSubtype 5 (FRAME_UNCOMPRESSED) > bFrameIndex 7 > bmCapabilities 0x00 > Still image unsupported > wWidth 480 > wHeight 270 > dwMinBitRate 73728000 > dwMaxBitRate 147456000 > dwMaxVideoFrameBufferSize 259200 > dwDefaultFrameInterval 333333 > bFrameIntervalType 1 > dwFrameInterval( 0) 333333 > VideoStreaming Interface Descriptor: > bLength 30 > bDescriptorType 36 > bDescriptorSubtype 5 (FRAME_UNCOMPRESSED) > bFrameIndex 8 > bmCapabilities 0x00 > Still image unsupported > wWidth 320 > wHeight 240 > dwMinBitRate 73728000 > dwMaxBitRate 147456000 > dwMaxVideoFrameBufferSize 153600 > dwDefaultFrameInterval 333333 > bFrameIntervalType 1 > dwFrameInterval( 0) 333333 > VideoStreaming Interface Descriptor: > bLength 30 > bDescriptorType 36 > bDescriptorSubtype 5 (FRAME_UNCOMPRESSED) > bFrameIndex 9 > bmCapabilities 0x00 > Still image unsupported > wWidth 176 > wHeight 144 > dwMinBitRate 73728000 > dwMaxBitRate 147456000 > dwMaxVideoFrameBufferSize 50688 > dwDefaultFrameInterval 333333 > bFrameIntervalType 1 > dwFrameInterval( 0) 333333 > VideoStreaming Interface Descriptor: > bLength 43 > bDescriptorType 36 > bDescriptorSubtype 3 (STILL_IMAGE_FRAME) > bEndpointAddress 0x00 EP 0 OUT > bNumImageSizePatterns 9 > wWidth( 0) 1280 > wHeight( 0) 720 > wWidth( 1) 800 > wHeight( 1) 600 > wWidth( 2) 800 > wHeight( 2) 480 > wWidth( 3) 720 > wHeight( 3) 480 > wWidth( 4) 640 > wHeight( 4) 480 > wWidth( 5) 640 > wHeight( 5) 360 > wWidth( 6) 480 > wHeight( 6) 270 > wWidth( 7) 320 > wHeight( 7) 240 > wWidth( 8) 176 > wHeight( 8) 144 > bNumCompressionPatterns 1 > bCompression( 0) 1 > 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 0x85 EP 5 IN > bmAttributes 5 > Transfer Type Isochronous > Synch Type Asynchronous > Usage Type Data > wMaxPacketSize 0x0100 1x 256 bytes > bInterval 1 > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 1 > bAlternateSetting 2 > bNumEndpoints 1 > bInterfaceClass 14 Video > bInterfaceSubClass 2 Video Streaming > 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 0x0200 1x 512 bytes > bInterval 1 > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 1 > bAlternateSetting 3 > bNumEndpoints 1 > bInterfaceClass 14 Video > bInterfaceSubClass 2 Video Streaming > 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 0x0400 1x 1024 bytes > bInterval 1 > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 1 > bAlternateSetting 4 > bNumEndpoints 1 > bInterfaceClass 14 Video > bInterfaceSubClass 2 Video Streaming > 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 0x0b00 2x 768 bytes > bInterval 1 > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 1 > bAlternateSetting 5 > bNumEndpoints 1 > bInterfaceClass 14 Video > bInterfaceSubClass 2 Video Streaming > 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 0x0c00 2x 1024 bytes > bInterval 1 > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 1 > bAlternateSetting 6 > bNumEndpoints 1 > bInterfaceClass 14 Video > bInterfaceSubClass 2 Video Streaming > 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 0x1354 3x 852 bytes > bInterval 1 > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 1 > bAlternateSetting 7 > bNumEndpoints 1 > bInterfaceClass 14 Video > bInterfaceSubClass 2 Video Streaming > 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 0x1400 3x 1024 bytes > bInterval 1 > Interface Association: > bLength 8 > bDescriptorType 11 > bFirstInterface 2 > bInterfaceCount 2 > bFunctionClass 1 Audio > bFunctionSubClass 0 > bFunctionProtocol 0 > iFunction 4 GENERAL WEBCAM > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 2 > bAlternateSetting 0 > bNumEndpoints 0 > bInterfaceClass 1 Audio > bInterfaceSubClass 1 Control Device > bInterfaceProtocol 0 > iInterface 4 GENERAL WEBCAM > AudioControl Interface Descriptor: > bLength 9 > bDescriptorType 36 > bDescriptorSubtype 1 (HEADER) > bcdADC 1.00 > wTotalLength 0x0026 > bInCollection 1 > baInterfaceNr(0) 3 > AudioControl Interface Descriptor: > bLength 12 > bDescriptorType 36 > bDescriptorSubtype 2 (INPUT_TERMINAL) > bTerminalID 3 > 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 5 > bSourceID 3 > bControlSize 1 > bmaControls(0) 0x03 > Mute Control > Volume Control > iFeature 0 > AudioControl Interface Descriptor: > bLength 9 > bDescriptorType 36 > bDescriptorSubtype 3 (OUTPUT_TERMINAL) > bTerminalID 4 > wTerminalType 0x0101 USB Streaming > bAssocTerminal 0 > bSourceID 5 > 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 0 > bInterfaceClass 1 Audio > bInterfaceSubClass 2 Streaming > bInterfaceProtocol 0 > iInterface 0 > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 3 > bAlternateSetting 2 > bNumEndpoints 0 > bInterfaceClass 1 Audio > bInterfaceSubClass 2 Streaming > bInterfaceProtocol 0 > iInterface 0 > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 3 > bAlternateSetting 3 > bNumEndpoints 0 > bInterfaceClass 1 Audio > bInterfaceSubClass 2 Streaming > bInterfaceProtocol 0 > iInterface 0 > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 3 > bAlternateSetting 4 > bNumEndpoints 0 > bInterfaceClass 1 Audio > bInterfaceSubClass 2 Streaming > bInterfaceProtocol 0 > iInterface 0 > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 3 > bAlternateSetting 5 > 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 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 0x87 EP 7 IN > bmAttributes 1 > Transfer Type Isochronous > Synch Type None > Usage Type Data > wMaxPacketSize 0x0100 1x 256 bytes > bInterval 4 > bRefresh 0 > bSynchAddress 0 > AudioStreaming Endpoint Descriptor: > bLength 7 > bDescriptorType 37 > bDescriptorSubtype 1 (EP_GENERAL) > bmAttributes 0x00 > bLockDelayUnits 0 Undefined > wLockDelay 0x0000 > Device Qualifier (for other device speed): > bLength 10 > bDescriptorType 6 > bcdUSB 2.00 > bDeviceClass 0 > bDeviceSubClass 0 > bDeviceProtocol 0 > bMaxPacketSize0 64 > bNumConfigurations 1 > Device Status: 0x0001 > Self Powered -- Regards, Laurent Pinchart
