我们正在开发一个基于Chrome（现在迁移到WEBUSB的旧USB API）和网络摄像头的项目。 USB网络摄像头有一个用于拍照的按钮。在MAC和Linux中，我可以使用getUserMedia（）显示网络摄像头的实时视频，同时我可以使用Web USB API与设备通信以检测按钮按下。 问题是窗户。在Windows上，Chorme可以将USB设备视为可从getUserMedia访问的网络摄像头（如果我安装USB设备原始驱动程序）或可从WebUSB访问的USB设备（如果我用WINUSB替换原始驱动程序），但我们无法使用这两个API toghether。这只是WINDOWS上的一个问题，在Mac或Linux上都有效。我们怎样解决这个问题？
N.B。 为了使javascript USB命令在linux和OSX上运行，我必须在传输命令中将“interface”替换为“endpoint”。
Linux lsusb dump：
Bus 001 Device 008: ID a168:0872 AnMo Electronics Corporation
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 239 Miscellaneous Device
bDeviceSubClass 2
bDeviceProtocol 1 Interface Association
bMaxPacketSize0 64
idVendor 0xa168 AnMo Electronics Corporation
idProduct 0x0872
bcdDevice 20.01
iManufacturer 1 ANMO Electronics Corporation
iProduct 2 Dino-Lite Premier
iSerial 3
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 509
bNumInterfaces 2
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
(Bus Powered)
MaxPower 500mA
Interface Association:
bLength 8
bDescriptorType 11
bFirstInterface 0
bInterfaceCount 2
bFunctionClass 14 Video
bFunctionSubClass 3 Video Interface Collection
bFunctionProtocol 0
iFunction 2 Dino-Lite Premier
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 14 Video
bInterfaceSubClass 1 Video Control
bInterfaceProtocol 0
iInterface 2 Dino-Lite Premier
VideoControl Interface Descriptor:
bLength 13
bDescriptorType 36
bDescriptorSubtype 1 (HEADER)
bcdUVC 1.00
wTotalLength 80
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 0x000200a2
Auto-Exposure Mode
Focus (Absolute)
Iris (Absolute)
Focus, Auto
VideoControl Interface Descriptor:
bLength 11
bDescriptorType 36
bDescriptorSubtype 5 (PROCESSING_UNIT)
Warning: Descriptor too short
bUnitID 3
bSourceID 1
wMaxMultiplier 0
bControlSize 2
bmControls 0x0000147f
Brightness
Contrast
Hue
Saturation
Sharpness
Gamma
White Balance Temperature
Power Line Frequency
White Balance Temperature, Auto
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 4
guidExtensionCode {2652215a-8932-5641-894a-5c557cdf9664}
bNumControl 16
bNrPins 1
baSourceID( 0) 3
bControlSize 4
bmControls( 0) 0xff
bmControls( 1) 0xff
bmControls( 2) 0xff
bmControls( 3) 0xff
iExtension 0
VideoControl Interface Descriptor:
bLength 9
bDescriptorType 36
bDescriptorSubtype 3 (OUTPUT_TERMINAL)
bTerminalID 2
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 0x0008 1x 8 bytes
bInterval 9
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 0
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 0x0000 1x 0 bytes
bInterval 1
INTERFACE CLASS: 0f 24 01 02 67 01 82 00 02 01 01 00 01 00 00
INTERFACE CLASS: 0b 24 06 01 05 00 01 00 00 00 00
INTERFACE CLASS: 1e 24 07 01 00 80 02 e0 01 00 00 08 ca 00 00 08 ca 00 60 09 00 15 16 05 00 01 15 16 05 00
INTERFACE CLASS: 1e 24 07 02 00 40 01 f0 00 80 00 02 32 80 00 02 32 00 58 02 00 15 16 05 00 01 15 16 05 00
INTERFACE CLASS: 1e 24 07 03 00 a0 00 78 00 a0 00 00 8c a0 00 00 8c 00 96 00 00 15 16 05 00 01 15 16 05 00
INTERFACE CLASS: 1e 24 07 04 00 00 05 00 04 00 00 19 00 00 00 19 00 00 00 28 00 20 a1 07 00 01 20 a1 07 00
INTERFACE CLASS: 1e 24 07 01 00 80 02 e0 01 00 00 08 ca 00 00 08 ca 00 60 09 00 15 16 05 00 01 15 16 05 00
INTERFACE CLASS: 1b 24 04 02 05 59 55 59 32 00 00 10 00 80 00 00 aa 00 38 9b 71 10 01 00 00 00 00
INTERFACE CLASS: 1e 24 05 01 00 80 02 e0 01 00 00 08 ca 00 00 08 ca 00 60 09 00 15 16 05 00 01 15 16 05 00
INTERFACE CLASS: 1e 24 05 02 00 40 01 f0 00 80 00 02 32 80 00 02 32 00 58 02 00 15 16 05 00 01 15 16 05 00
INTERFACE CLASS: 1e 24 05 03 00 a0 00 78 00 a0 00 00 8c a0 00 00 8c 00 96 00 00 15 16 05 00 01 15 16 05 00
INTERFACE CLASS: 1e 24 05 04 00 00 05 00 04 00 00 19 00 00 00 19 00 00 00 28 00 20 a1 07 00 01 20 a1 07 00
INTERFACE CLASS: 1e 24 05 01 00 80 02 e0 01 00 00 08 ca 00 00 08 ca 00 60 09 00 15 16 05 00 01 15 16 05 00
INTERFACE CLASS: 06 24 0d 00 00 00
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
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
can't get debug descriptor: Resource temporarily unavailable
Device Status: 0x0000
(Bus Powered)
答案 0 :(得分：0)
根据上面lsusb -v的输出，我可以看到该设备有一个由两个USB接口组成的功能。接口关联描述符（IAD）向主机操作系统发出信号，表明这两个接口是相关的，而像Windows这样的操作系统会将它们视为单个接口，以便进行驱动程序绑定。
我的猜测是，在Linux和macOS上，您可以与EP 1 IN端点通信，因为USB视频类（UVC）驱动程序仅声明接口1。在Windows上，由于它将两个接口视为单个实体＆＃34;功能0＆＃34;，因此您无法声明接口0，因为接口1已被声明为功能0的一部分。