前面我们分享了:
UAC的扬声器设备，https://mp.weixin.qq.com/s/_oHU-1ied_LMcyO1PtLv4g
UAC的麦克风设备，https://mp.weixin.qq.com/s/M3LR3POC14BrgYavhH0qtg
UAC的扬声器+UAC麦克风的设备，https://mp.weixin.qq.com/s/bLSLwPjl5cC_8X-YxZo89Q
UVC+UAC扬声器+UAC麦克风设备，https://mp.weixin.qq.com/s/_5quPTyLQ-_T0D7MfMTqCw
而一般在开发和维护过程中还需要和设备交互的链路，通常做法是使用UART，但是这样需要多预留接口不是很方便，我们可以使用CDC虚拟出一个串口来用于和设备通讯进行管理。这样ALL IN USB非常方便。所以本文继续在UVC+UAC(扬声器+麦克风)的复合设备的基础上再添加CDC。
重点在该复合设备的描述符拓扑和描述符的内容，具体每个设备的枚举类相关请求等可以参考前面的文章和规格书。
我们使用IAD可以方便的实现复合设备，前面已经实现了UVC和UAC以及其复合设备，现在只需要再添加一个CDC，即添加一个IAD即可。
IAD可以参考文章https://mp.weixin.qq.com/s/qPdHOjLlZRoAKCdj1_8ZGA。
配置描述符拓扑如下，分为3个IAD
UVC部分
UAC部分
CDC部分
UVC一共两个接口
控制接口0，一个输入终端，一个处理单元，一个输出终端。
0带宽流接口1的alt 0, 实现了MJPEG一种格式， 5种分辨率。
非0带宽流接口1的alt 1，实现一个IN端点0x81用于发送数据。
UAC一共3个接口,接口2是控制接口，接口3是扬声器流，接口4是麦克风流。
接口3的alt0是0带宽接口，设置接口选择该alt时关闭扬声器流，alt1是数据流接口，设置接口选择该alt时启动扬声器流，该接口下有一个OUT端点用于接收数据。
接口4的alt0是0带宽接口，设置接口选择该alt时关闭麦克风流，alt1是数据流接口，设置接口选择该alt时启动麦克风流，该接口下有一个IN端点用于发送数据。
控制接口中包括
扬声器的:输入终端1，特征单元2和输出终端3。流接口3的alt 1绑定到输入终端，
而输入终端对应的是OUT端点0x02
麦克风的:输入终端4，特征单元5和输出终端6。流接口4的alt 1绑定到输出终端，
而输出终端对应的是IN端点0x82，注意这里在特征单元5和输出终端6之间插入了选择单元7.
CDC控制接口5
数据接口6，一个IN端点，一个OUT端点。
设备描述符和配置描述符如下，字符串描述符就略去了，描述符后有详细的注释和注意说明，不再赘述。
static const uint8_t dev_desc[] ={0x12, /* bLength 本描述符长度,固定为0x12 */0x01, /* bDescriptorType 描述符类型DEVICE=1, 见Table 9-5. Descriptor Types */0x00,0x02, /* bcdUSB USB规格书发布编号,BCD,小端 *//* bDeviceClass-bDeviceSubClass-DeviceProtocol决定具体设备类型 见https://www.usb.org/defined-class-codes* 这里EF-02-01表示IAD设备*/0xEF, /* bDeviceClass 设备类类型 */0x02, /* bDeviceSubClass 设备子类 */0x01, /* bDeviceProtocol 设备协议 */0x40, /* bMaxPacketSize0 控制端点最大包大小 */0x4A,0x4C, /* idVendor 厂商ID VID,小端*/0x55,0x4C, /* idProduct 产品ID PID,小端*/0x00,0x01, /* bcdDevice 设备发布号,BCD,小端*/0x01, /* iManufacturer 制造商字符串描述符索引 */0x02, /* iProduct 产品字符串描述符索引 */0x00, /* iSerialNumber 设备序列号字符串描述符索引 0则不使用 */0x01, /* bNumConfigurations 配置个数 */};static const uint8_t cfg_desc[] = {/* 配置描述符见Table 9-10. Standard Configuration Descriptor */0x09, /* bLength 本描述符长度,固定为9 */0x02, /* bDescriptorType 描述符类型CONFIGURATION =0x02, 见Table 9-5. Descriptor Types P251 */0x3A, /* wTotalLength 本配置符所有内容长度,小端 */0x02,0x07, /* bNumInterfaces 本配置的接口数 一个控制一个流 */0x01, /* bConfigurationValue 设置配置请求,选择该配置的对应的设置值 */0x00, /* iConfiguration 本配置对应的字符串描述符,配置为0则没有 */0x80, /* bmAttributes 配置特征 D7固定为1 D6:Self-powered D5:Remote Wakeup*/0xC8, /* bMaxPower 最大消耗电流,单位2mA *//********************************************************* 以下是UVC部分*******************************************************//*** IAD描述符* 见UVC 1.5 Class specification.pdf 3.6 Interface Association Descriptor P60*/0x08, /* bLength 本描述符长度,固定为8 */0x0B, /* bDescriptorType 描述符类型 INTERFACE_ASSOCIATION=0x0B 参考InterfaceAssociationDescriptor_ecn P3 */UVC_ITF_VC, /* bFirstInterface 本IAD下第一个接口 */0x02, /* bInterfaceCount 本IAD下接口数,默认一个控制接口一个流接口 */0x0E, /* bFunctionClass 功能类 见UVC 1.5 Class specification.pdf Table A- 1 Video Interface Class Code P171 CC_VIDEO=0x0E */0x03, /* bFunctionSubClass 功能子类 见UVC 1.5 Class specification.pdf Table A- 2 Video Interface Subclass Codes P171 SC_VIDEO_INTERFACE_COLLECTION=0x03 */0x00, /* bFunctionProtocol 功能协议号 见UVC 1.5 Class specification.pdf Table A- 3 Video Interface Protocol Codes P171 PC_PROTOCOL_UNDEFINED=0x00 */0x05, /* iFunction 对应字符串索引 *//* 控制接口描述符 见UVC 1.5 Class specification.pdf 3.7 VideoControl Interface Descriptors P61* Table 3-2 Standard VC Interface Descriptor*/0x09, /* bLength 本描述符长度,固定为9 */0x04, /* bDescriptorType 描述符类型 见usb_20 P251 Table 9-5. Descriptor Types INTERFACE=4 */UVC_ITF_VC, /* bInterfaceNumber 接口号,从0开始 */0x00, /* bAlternateSetting alt接口号,从0开始 */0x00, /* bNumEndpoints 本接口下端点数 */0x0E, /* bInterfaceClass 接口类,见UVC 1.5 Class specification.pdf Table A- 1 Video Interface Class Code P171 CC_VIDEO=0x0E */0x01, /* bInterfaceSubClass接口子类 见UVC 1.5 Class specification.pdf Table A- 2 Video Interface Subclass Codes P171 SC_VIDEOCONTROL=0x01 */0x00, /* bInterfaceProtocol 接口协议号,见UVC 1.5 Class specification.pdf Table A- 3 Video Interface Protocol Codes P171 PC_PROTOCOL_UNDEFINED=0x00 */0x05, /* iInterface 本接口字符串描述符索引 *//* 见UVC 1.5 Class specification.pdf 3.7.2 Class-Specific VC Interface Descriptor P62* Table 3-3 Class-specific VC Interface Header Descriptor*/0x0D, /* bLength 本描述符长度 12+n */0x24, /* bDescriptorType 描述符类型 见UVC 1.5 Class specification.pdf P171 Table A- 4 Video Class-Specific Descriptor Types CS_INTERFACE=0x24 */0x01, /* bDescriptorSubType 描述符子类型 见UVC 1.5 Class specification.pdf P172 Table A- 5 Video Class-Specific VC Interface Descriptor Subtypes VC_HEADER=0x01 */0x00, 0x01, /* bcdUVC UVC版本,压缩BCD,小端 */0x50, 0x00, /* wTotalLength 本描述符加后面的所有Input/Output Terminal和Unit的总长 */UVC_MAKE_DWORD(UVC_CLOCKFRQ), /* dwClockFrequency 设备时钟频率,单位Hz,小端4字节 */1, /* bInCollection 本VideoControl接口包含的VideoStreaming interfaces接口数 */UVC_ITF_VS, /* baInterfaceNr(1) 第一个VideoStreaming interface接口号 *//* 见UVC 1.5 Class specification.pdf P64 3.7.2.1 Input Terminal Descriptor* Table 3-4 Input Terminal Descriptor*/0x12, /* bLength 8+x */0x24, /* bDescriptorType 描述符类型 见UVC 1.5 Class specification.pdf P171 Table A- 4 Video Class-Specific Descriptor Types CS_INTERFACE=0x24 */0x02, /* bDescriptorSubType 描述符子类型 见UVC 1.5 Class specification.pdf P172 Table A- 5 Video Class-Specific VC Interface Descriptor Subtypes VC_INPUT_TERMINAL=0x02 */UVC_TID_IN, /* bTerminalID (1) 终端ID,非0 */UVC_MAKE_WORD(0x0201), /* wTerminalType 见UVC 1.5 Class specification.pdf P177 Table B- 2 Input Terminal Types (ITT_CAMERA=0x0201) */0x00, /* bAssocTerminal(Not associated with an Output Terminal) */0x00, /* iTerminal 终端的字符串描述符索引, (No String Descriptor) */UVC_MAKE_WORD(0x0000), /* wObjectiveFocalLengthMin */UVC_MAKE_WORD(0x0000), /* wObjectiveFocalLengthMax */UVC_MAKE_WORD(0x0000), /* wOcularFocalLength */0x03, /* bControlSize (3 bytes) *//* bmControlsD0: Scanning ModeD1: Auto-Exposure ModeD2: Auto-Exposure PriorityD3: Exposure Time (Absolute)D4: Exposure Time (Relative)D5: Focus (Absolute)D6 : Focus (Relative)D7: Iris (Absolute)D8 : Iris (Relative)D9: Zoom (Absolute)D10: Zoom (Relative)D11: PanTilt (Absolute)D12: PanTilt (Relative)D13: Roll (Absolute)D14: Roll (Relative)D15: ReservedD16: ReservedD17: Focus, AutoD18: PrivacyD19: Focus, SimpleD20: WindowD21: Region of InterestD22 – D23: Reserved, set to zero*/0x0A,0x00,0x00,/* 见UVC 1.5 Class specification.pdf P69 3.7.2.5 Processing Unit Descriptor* Table 3-8 Processing Unit Descriptor*/0x0B, /* bLength (11 bytes) */0x24, /* bDescriptorType 描述符类型 见UVC 1.5 Class specification.pdf P171 Table A- 4 Video Class-Specific Descriptor Types CS_INTERFACE=0x24 */0x05, /* bDescriptorSubType 描述符子类型 见UVC 1.5 Class specification.pdf P172 Table A- 5 Video Class-Specific VC Interface Descriptor Subtypes VC_PROCESSING_UNIT=0x05 */UVC_TID_PU, /* bUnitID (1) */UVC_TID_IN, /* bSourceID (2) */UVC_MAKE_WORD(0x0000), /* wMaxMultiplier */0x02, /* bControlSize (3 bytes) *//*bmControlsD0: BrightnessD1: ContrastD2: HueD3: SaturationD4: SharpnessD5: GammaD6: White Balance TemperatureD7: White Balance ComponentD8: Backlight CompensationD9: GainD10: Power Line FrequencyD11: Hue, AutoD12: White Balance Temperature, AutoD13: White Balance Component, AutoD14: Digital MultiplierD15: Digital Multiplier LimitD16: Analog Video StandardD17: Analog Video Lock StatusD18: Contrast, AutoD19 – D23: Reserved. Set to zero*/0x7B,0x07,0x00, /* iProcessing Index of a string descriptor *//* bmVideoStandardsD0: NoneD1: NTSC – 525/60D2: PAL – 625/50D3: SECAM – 625/50D4: NTSC – 625/50D5: PAL – 525/60*///0x00,/* 见UVC 1.5 Class specification.pdf P73 Table 3-10 Extension Unit Descriptor**/0x1D, /* bLength */0x24, /* bDescriptorType 描述符类型 见UVC 1.5 Class specification.pdf P171 Table A- 4 Video Class-Specific Descriptor Types CS_INTERFACE=0x24 */0x06, /* bDescriptorSubType 描述符子类型 见UVC 1.5 Class specification.pdf P172 Table A- 5 Video Class-Specific VC Interface Descriptor Subtypes VC_EXTENSION_UNIT=0x06 */0x03, /* bUnitID 应该是UVC_TID_EXT=4 这里可能之前还有一个扩展单元3删掉了 */0x70,0x33,0xF0,0x28, /*guidExtensionCode:{28F03370-6311-4A2E-BA2C-6890EB334016} */0x11,0x63,0x2E,0x4A,0xBA,0x2C,0x68,0x90,0xEB,0x33,0x40,0x16,0x08, /* bNumControls */0x01, /* bNrInPins */UVC_TID_PU, /* baSourceID[1] */0x04, /* bControlSize *//* bmControlsD0~D31: 1 yes - Vendor-Specific (Optional)*/0xFF,0xFF,0xFF,0xFF,0x00, /* iExtension *//* 见UVC 1.5 Class specification.pdf 3.7.2.2 Output Terminal Descriptor P66 */0x09, /* bLength */0x24, /* bDescriptorType 描述符类型 见UVC 1.5 Class specification.pdf P171 Table A- 4 Video Class-Specific Descriptor Types CS_INTERFACE=0x24 */0x03, /* bDescriptorSubType 描述符子类型 见UVC 1.5 Class specification.pdf P172 Table A- 5 Video Class-Specific VC Interface Descriptor Subtypes VC_OUTPUT_TERMINAL=0x03 */UVC_TID_OUT, /* bTerminalID 终端ID. 9.2.1 Input Header Descriptor的bTerminalLink对应 */UVC_MAKE_WORD(0x0101), /* wTerminalType 见UVC 1.5 Class specification.pdf P177 Table B- 1 USB Terminal Types (TT_STREAMING=0x0101) */0, /* bAssocTerminal 关联Input Terminal */UVC_TID_EXT, /* bSourceID 本终端连接的Unit or Terminal的ID */0x00, /* iTerminal 描述终端的字符串描述符索*//* Class-Specific VS Interface Descriptors alternate setting 0* 见UVC 1.5 Class specification.pdf P76 Table 3-13 Standard VS Interface Descriptor*/0x09, /* bLength 接口描述符长固定9字节 */0x04, /* bDescriptorType bDescriptorType 见usb_20 P251 Table 9-5. Descriptor Types INTERFACE=4 */UVC_ITF_VS, /* bInterfaceNumber 接口索引 */0x00, /* bAlternateSetting alt接口设置索引 */0x00, /* bNumEndpoints 本接口使用的端点个数(不含端点0) */0x0E, /* bInterfaceClass 见UVC 1.5 Class specification.pdf P171 Table A- 1 Video Interface Class Code CC_VIDEO=0x0E */0x02, /* bInterfaceSubClass 见UVC 1.5 Class specification.pdf P171 Table A- 2 Video Interface Subclass Codes SC_VIDEOSTREAMING=0x02 */0x00, /* bInterfaceProtocol 见UVC 1.5 Class specification.pdf P171 Table A- 3 Video Interface Protocol Codes PC_PROTOCOL_UNDEFINED=0x00 */0x00, /* iInterface 字符串描述符索引 0: *//* 3.9.2 Class-Specific VS Interface Descriptors3.9.2.1 Input Header Descriptor见UVC 1.5 Class specification.pdf P76 Table 3-14 Class-specific VS Interface Input Header Descriptor*/0x0F, /* bLength 13+(p*n) */0x24, /* bDescriptorType 描述符类型 见UVC 1.5 Class specification.pdf P171 Table A- 4 Video Class-Specific Descriptor Types CS_INTERFACE=0x24 */0x01, /* bDescriptorSubtype 见UVC 1.5 Class specification.pdf P172 Table A- 6 Video Class-Specific VS Interface Descriptor Subtypes VS_INPUT_HEADER=0x01 */0x01, /* bNumFormats 本接口对应的格式描述符个数 */0xB6,0x00, /* wTotalLength 本描述符加上后面格式描述帧描述符的长*/UVC_IN_ED, /* bEndpointAddress videa data对应的端D7: Direction 1 = IN endpoint D3..0: The endpoint number*/0x00, /* bmInfo D0: Dynamic Format Change supported */UVC_TID_OUT, /* bTerminalLink 本接口的video端点连接的输出终端的ID */0x00, /* bStillCaptureMethod Method of still image capture */0x00, /* bTriggerSupport */0x00, /* bTriggerUsage */0x02, /* bControlSize bmaControls区域的大小 每个格式对应1字节,4种格式 *//*For bits D3..0, a bit set to 1 indicates thatthe named field is supported by the VideoProbe and Commit Control whenbFormatIndex is 1:D0: wKeyFrameRateD1: wPFrameRateD2: wCompQualityD3: wCompWindowSizeFor bits D5..4, a bit set to 1 indicates thatthe named control is supported by thedevice when bFormatIndex is 1:D4: Generate Key FrameD5: Update Frame SegmentD6..(n*8-1): Reserved, set to zero*/0x00, /* bmaControls(1) */0x00, /* bmaControls(2) *//*************************************** MJPEG格式部分*************************************//* 见 MJPEG USB_Video_Payload_MJPEG_1.5.pdf P12 3.1.1 MJPEG Video Format Descriptor */0x0B, /* bLength 描述符长固定x0B */0x24, /* bDescriptorType 描述符类型 见UVC 1.5 Class specification.pdf P171 Table A- 4 Video Class-Specific Descriptor Types CS_INTERFACE=0x24 */0x06, /* bDescriptorSubtype 见UVC 1.5 Class specification.pdf P172 Table A- 6 Video Class-Specific VS Interface Descriptor Subtypes VS_FORMAT_MJPEG=0x06 */0x01, /* bFormatIndex 格式描述索引 */0x05, /* bNumFrameDescriptors 与此格式描述符对应的帧描述符个数 */0x00, /* bmFlags D0: FixedSizeSamples. 1 = Yes */0x01, /* bDefaultFrameIndex 此流的默认帧索引 */0x00, /* bAspectRatioX 纵横比x*/0x00, /* bAspectRatioY 纵横比y*//*Specifies interlace information. If thescanning mode control in the CameraTerminal is supported for this stream,this field should reflect the field formatused in interlaced mode.(Top field in PAL is field 1, top field inNTSC is field 2.):D0: Interlaced stream or variable. 1 =YesD1: Fields per frame. 0= 2 fields, 1 = 1fieldD2: Field 1 first. 1 = YesD3: ReservedD5..4: Field pattern00 = Field 1 only01 = Field 2 only10 = Regular pattern of fields 1 and 211 = Random pattern of fields 1 and 2D7..6: Reserved. Do not use.*/0x00, /* bmInterlaceFlags */0x00, /* bCopyProtect 是否限制重复的视频流 *//* 见 MJPEG USB_Video_Payload_MJPEG_1.5.pdf P13 Table 3-2 Motion-JPEG Video Frame Descriptor */0x1E, /* bLength 描述符长bFrameIntervalType=08,bFrameIntervalType>06+(4*n) */0x24, /* bDescriptorType 描述符类型 见UVC 1.5 Class specification.pdf P171 Table A- 4 Video Class-Specific Descriptor Types CS_INTERFACE=0x24 */0x07, /* bDescriptorSubtype 见UVC 1.5 Class specification.pdf P172 Table A- 6 Video Class-Specific VS Interface Descriptor Subtypes VS_FRAME_MJPEG=0x07 */0x01, /* bFrameIndex 帧描述符索引 */0x00, /* bmCapabilities D0: Still image supported(Image Capture Method 1) D1: Fixed frame-rate*/UVC_MAKE_WORD(UVC_MJPEG_WIDTH_MAX1), /* wWidth */UVC_MAKE_WORD(UVC_MJPEG_HEIGHT_MAX1), /* wHeight */UVC_MAKE_DWORD(UVC_MJPEG_MIN_BIT_RATE1), /* dwMinBitRate 指定默认压缩质量下和最长的帧间隔时对应的传输最小比特率bps */UVC_MAKE_DWORD(UVC_MJPEG_MAX_BIT_RATE1), /* dwMaxBitRate 指定默认压缩质量下和最短的帧间隔时对应的传输最大比特率bps */UVC_MAKE_DWORD(UVC_MJPEG_MAX_FRAME_SIZE1), /* dwMaxVideoFrameBufferSize 帧压缩缓冲大小 */UVC_MAKE_DWORD(UVC_MJPEG_FRAME_DEFINTERVEL), /* dwDefaultFrameInterval 默认帧间隔 */0x01, /* bFrameIntervalType 帧间隔配置方0:连续帧间1..255:离散帧间隔配置个*/UVC_MAKE_DWORD(UVC_MJPEG_FRAME_DEFINTERVEL), /* 帧间隔 单位 100ns *//* 见 MJPEG USB_Video_Payload_MJPEG_1.5.pdf P13 Table 3-2 Motion-JPEG Video Frame Descriptor */0x1E, /* bLength 描述符长bFrameIntervalType=08,bFrameIntervalType>06+(4*n) */0x24, /* bDescriptorType 描述符类型 见UVC 1.5 Class specification.pdf P171 Table A- 4 Video Class-Specific Descriptor Types CS_INTERFACE=0x24 */0x07, /* bDescriptorSubtype 见UVC 1.5 Class specification.pdf P172 Table A- 6 Video Class-Specific VS Interface Descriptor Subtypes VS_FRAME_MJPEG=0x07 */0x02, /* bFrameIndex 帧描述符索引 */0x00, /* bmCapabilities D0: Still image supported(Image Capture Method 1) D1: Fixed frame-rate*/UVC_MAKE_WORD(UVC_MJPEG_WIDTH_MAX2), /* wWidth */UVC_MAKE_WORD(UVC_MJPEG_HEIGHT_MAX2), /* wHeight */UVC_MAKE_DWORD(UVC_MJPEG_MIN_BIT_RATE2), /* dwMinBitRate 指定默认压缩质量下和最长的帧间隔时对应的传输最小比特率bps */UVC_MAKE_DWORD(UVC_MJPEG_MAX_BIT_RATE2), /* dwMaxBitRate 指定默认压缩质量下和最短的帧间隔时对应的传输最大比特率bps */UVC_MAKE_DWORD(UVC_MJPEG_MAX_FRAME_SIZE2), /* dwMaxVideoFrameBufferSize 帧压缩缓冲大小 */UVC_MAKE_DWORD(UVC_MJPEG_FRAME_DEFINTERVEL), /* dwDefaultFrameInterval 默认帧间隔 */0x01, /* bFrameIntervalType 帧间隔配置方0:连续帧间1..255:离散帧间隔配置个*/UVC_MAKE_DWORD(UVC_MJPEG_FRAME_DEFINTERVEL), /* 帧间隔 单位 100ns *//* 见 MJPEG USB_Video_Payload_MJPEG_1.5.pdf P13 Table 3-2 Motion-JPEG Video Frame Descriptor */0x1E, /* bLength 描述符长bFrameIntervalType=08,bFrameIntervalType>06+(4*n) */0x24, /* bDescriptorType 描述符类型 见UVC 1.5 Class specification.pdf P171 Table A- 4 Video Class-Specific Descriptor Types CS_INTERFACE=0x24 */0x07, /* bDescriptorSubtype 见UVC 1.5 Class specification.pdf P172 Table A- 6 Video Class-Specific VS Interface Descriptor Subtypes VS_FRAME_MJPEG=0x07 */0x03, /* bFrameIndex 帧描述符索引 */0x00, /* bmCapabilities D0: Still image supported(Image Capture Method 1) D1: Fixed frame-rate*/UVC_MAKE_WORD(UVC_MJPEG_WIDTH_MAX3), /* wWidth */UVC_MAKE_WORD(UVC_MJPEG_HEIGHT_MAX3), /* wHeight */UVC_MAKE_DWORD(UVC_MJPEG_MIN_BIT_RATE3), /* dwMinBitRate 指定默认压缩质量下和最长的帧间隔时对应的传输最小比特率bps */UVC_MAKE_DWORD(UVC_MJPEG_MAX_BIT_RATE3), /* dwMaxBitRate 指定默认压缩质量下和最短的帧间隔时对应的传输最大比特率bps */UVC_MAKE_DWORD(UVC_MJPEG_MAX_FRAME_SIZE3), /* dwMaxVideoFrameBufferSize 帧压缩缓冲大小 */UVC_MAKE_DWORD(UVC_MJPEG_FRAME_DEFINTERVEL), /* dwDefaultFrameInterval 默认帧间隔 */0x01, /* bFrameIntervalType 帧间隔配置方0:连续帧间1..255:离散帧间隔配置个*/UVC_MAKE_DWORD(UVC_MJPEG_FRAME_DEFINTERVEL), /* 帧间隔 单位 100ns *//* 见 MJPEG USB_Video_Payload_MJPEG_1.5.pdf P13 Table 3-2 Motion-JPEG Video Frame Descriptor */0x1E, /* bLength 描述符长bFrameIntervalType=08,bFrameIntervalType>06+(4*n) */0x24, /* bDescriptorType 描述符类型 见UVC 1.5 Class specification.pdf P171 Table A- 4 Video Class-Specific Descriptor Types CS_INTERFACE=0x24 */0x07, /* bDescriptorSubtype 见UVC 1.5 Class specification.pdf P172 Table A- 6 Video Class-Specific VS Interface Descriptor Subtypes VS_FRAME_MJPEG=0x07 */0x04, /* bFrameIndex 帧描述符索引 */0x00, /* bmCapabilities D0: Still image supported(Image Capture Method 1) D1: Fixed frame-rate*/UVC_MAKE_WORD(UVC_MJPEG_WIDTH_MAX4), /* wWidth */UVC_MAKE_WORD(UVC_MJPEG_HEIGHT_MAX4), /* wHeight */UVC_MAKE_DWORD(UVC_MJPEG_MIN_BIT_RATE4), /* dwMinBitRate 指定默认压缩质量下和最长的帧间隔时对应的传输最小比特率bps */UVC_MAKE_DWORD(UVC_MJPEG_MAX_BIT_RATE4), /* dwMaxBitRate 指定默认压缩质量下和最短的帧间隔时对应的传输最大比特率bps */UVC_MAKE_DWORD(UVC_MJPEG_MAX_FRAME_SIZE4), /* dwMaxVideoFrameBufferSize 帧压缩缓冲大小 */UVC_MAKE_DWORD(UVC_MJPEG_FRAME_DEFINTERVEL), /* dwDefaultFrameInterval 默认帧间隔 */0x01, /* bFrameIntervalType 帧间隔配置方0:连续帧间1..255:离散帧间隔配置个*/UVC_MAKE_DWORD(UVC_MJPEG_FRAME_DEFINTERVEL), /* 帧间隔 单位 100ns *//* 见 MJPEG USB_Video_Payload_MJPEG_1.5.pdf P13 Table 3-2 Motion-JPEG Video Frame Descriptor */0x1E, /* bLength 描述符长bFrameIntervalType=08,bFrameIntervalType>06+(4*n) */0x24, /* bDescriptorType 描述符类型 见UVC 1.5 Class specification.pdf P171 Table A- 4 Video Class-Specific Descriptor Types CS_INTERFACE=0x24 */0x07, /* bDescriptorSubtype 见UVC 1.5 Class specification.pdf P172 Table A- 6 Video Class-Specific VS Interface Descriptor Subtypes VS_FRAME_MJPEG=0x07 */0x05, /* bFrameIndex 帧描述符索引 */0x00, /* bmCapabilities D0: Still image supported(Image Capture Method 1) D1: Fixed frame-rate*/UVC_MAKE_WORD(UVC_MJPEG_WIDTH_MAX5), /* wWidth */UVC_MAKE_WORD(UVC_MJPEG_HEIGHT_MAX5), /* wHeight */UVC_MAKE_DWORD(UVC_MJPEG_MIN_BIT_RATE5), /* dwMinBitRate 指定默认压缩质量下和最长的帧间隔时对应的传输最小比特率bps */UVC_MAKE_DWORD(UVC_MJPEG_MAX_BIT_RATE5), /* dwMaxBitRate 指定默认压缩质量下和最短的帧间隔时对应的传输最大比特率bps */UVC_MAKE_DWORD(UVC_MJPEG_MAX_FRAME_SIZE5), /* dwMaxVideoFrameBufferSize 帧压缩缓冲大小 */UVC_MAKE_DWORD(UVC_MJPEG_FRAME_DEFINTERVEL), /* dwDefaultFrameInterval 默认帧间隔 */0x01, /* bFrameIntervalType 帧间隔配置方0:连续帧间1..255:离散帧间隔配置个*/UVC_MAKE_DWORD(UVC_MJPEG_FRAME_DEFINTERVEL), /* 帧间隔 单位 100ns *//* 见 USB_Video_Payload_Uncompressed_1.5.pdf P83 Table 3-19 Color Matching Descriptor必须跟在Frame Descriptors后 一个格式描述符只能对应一个*/6, /* bLength */0x24, /* bDescriptorType 描述符类型 见UVC 1.5 Class specification.pdf P171 Table A- 4 Video Class-Specific Descriptor Types CS_INTERFACE=0x24 */0x0D, /* bDescriptorSubType : 见UVC 1.5 Class specification.pdf P172 Table A- 6 Video Class-Specific VS Interface Descriptor Subtypes VS_COLORFORMAT=0x0D */0x01, /* bColorPrimarie : 1: BT.709, sRGB (default) */0x01, /* bTransferCharacteristics : 1: BT.709 (default) */0x04, /* bMatrixCoefficients : 4: SMPTE 170M (BT.601,default) *//* 3.9.1 Standard VS Interface Descriptor alternate setting 1 */0x09, /* bLength 接口描述符长固定9字节 */0x04, /* bDescriptorType bDescriptorType 见usb_20 P251 Table 9-5. Descriptor Types INTERFACE=4 */UVC_ITF_VS, /* bInterfaceNumber 接口索引 */0x01, /* bAlternateSetting alt接口设置索引 */0x01, /* bNumEndpoints 本接口使用的端点个数(不含端点0) */0x0E, /* bInterfaceClass 见UVC 1.5 Class specification.pdf P171 Table A- 1 Video Interface Class Code CC_VIDEO=0x0E */0x02, /* bInterfaceSubClass 见UVC 1.5 Class specification.pdf P171 Table A- 2 Video Interface Subclass Codes SC_VIDEOSTREAMING=0x02 */0x00, /* bInterfaceProtocol 见UVC 1.5 Class specification.pdf P171 Table A- 3 Video Interface Protocol Codes PC_PROTOCOL_UNDEFINED=0x00 */0x00, /* iInterface 字符串描述符索引 0: *//* 3.10 VideoStreaming Endpoint Descriptors3.10.1.1 Standard VS Isochronous Video Data Endpoint Descriptor见UVC 1.5 Class specification.pdf P85 Table 3-20 Standard VS Isochronous Video Data Endpoint Descriptor*/0x07, /* bLength 端点描述符长固定7字节 */0x05, /* bDescriptorType 见usb_20.pdf P251 Table 9-5. Descriptor Types ENDPOINT=5 */UVC_IN_ED, /* bEndpointAddress D7: 0 = OUT端点 1 = IN端点 D3..0: 端点*/0x05, /* bmAttributes D3..2: 同步类型ISO端点只能01 = Asynchronous D1..0: 端点类型 01 = 同步端点 */0xFF, /* wMaxPacketSize 2字节 bit12:11表示一个微帧传几包 bit10:0包大*/0x13,0x01, /* bInterval 2^(bInterval-1) SOF的间 *//********************************************************* 以下是MIC+SPK部分*******************************************************//*** IAD描述符 参考InterfaceAssociationDescriptor_ecn P4*/0x08, /* bLength 本描述符长度,固定为8 */0x0B, /* bDescriptorType 描述符类型 INTERFACE_ASSOCIATION=0x0B 参考InterfaceAssociationDescriptor_ecn P3 */SPK_AC_ITF, /* bFirstInterface 本IAD下第一个接口 */0x03, /* bInterfaceCount 本IAD下接口数,默认一个控制接口一个SPK流接口一个MIC流接口 */0x01, /* bFunctionClass UAC是接口中说明类功能 这里应该是接口类 见https://www.usb.org/defined-class-codes (Audio=1) 见audio10.pdf P99 Table A-1: Audio Interface Class Code AUDIO=1 */0x02, /* bFunctionSubClass UAC是接口中说明类功能 这里应该是接口类子类 见audio10.pdf P99 Table A-2: Audio Interface Subclass Codes AUDIOSTREAMING=0x02 */0x00, /* bFunctionProtocol UAC是接口中说明类功能 这里应该是接口协议号 见audio10.pdf P99 Table A-3: Audio Interface Protocol Codes PR_PROTOCOL_UNDEFINED=0x00 */0x07, /* iFunction 对应字符串索引 *//********************************************************* 控制接口部分*******************************************************//* 接口描述符 UAC是接口描述符说明功能* 见usb_20 P268 Table 9-12. Standard Interface Descriptor*/0x09, /* bLength */0x04, /* bDescriptorType 见usb_20 P251 Table 9-5. Descriptor Types INTERFACE=4 */SPK_AC_ITF, /* bInterfaceNumber */0x00, /* bAlternateSetting */0x00, /* bNumEndpoints 本接口下无端点*/0x01, /* bInterfaceClass (Audio) 见audio10.pdf P99 Table A-1: Audio Interface Class Code AUDIO=1 */0x01, /* bInterfaceSubClass (Audio Control) 见audio10.pdf P99 Table A-2: Audio Interface Subclass Codes AUDIOCONTROL=0x01 */0x00, /* bInterfaceProtocol 见audio10.pdf P99 Table A-3: Audio Interface Protocol Codes PR_PROTOCOL_UNDEFINED=0x00 */0x07, /* iInterface 对应字符串索引 *//* BasicAudioDevice-10.pdf P57 Table 7-4: Headset Class-Specific AC Interface Header Descriptor */0x0A, /* bLength */0x24, /* bDescriptorType 见audio10.pdf P99 Table A-4: Audio Class-specific Descriptor Types CS_INTERFACE=0x24 */0x01, /* bDescriptorSubtype 见audio10.pdf P100 Table A-5: Audio Class-Specific AC Interface Descriptor Subtypes HEADER=0x01 */0x00,0x01, /* bcdADC Audio 1.0 */0x46,0x00, /* wTotalLength 本接口后续所有描述符的长度 从后面的bInCollection开始到本接口结束 */0x02, /* bInCollection 2个流接口 */SPK_AS_ITF, /* baInterfaceNr(1) SPK流接口号 */MIC_AS_ITF, /* baInterfaceNr(2) MIC流接口号 *//* BasicAudioDevice-10.pdf P22 Table 5-3: Mono Input Terminal Descriptor* BasicAudioDevice-10.pdf P21 5.3.3.1.3 Headphone Input Terminal ID1 Descriptor* BasicAudioDevice-10.pdf P58 7.3.3.1.3 Headset Input Terminal ID1 Descriptor*/0x0C, /* bLength */0x24, /* bDescriptorType 见audio10.pdf P99 Table A-4: Audio Class-specific Descriptor Types CS_INTERFACE=0x24 */0x02, /* bDescriptorSubtype 见audio10.pdf P100 Table A-5: Audio Class-Specific AC Interface Descriptor Subtypes INPUT_TERMINAL=0x02 */SPK_INPUT_TID,/* bTerminalID TID=1*/0x01,0x01, /* wTerminalType TT Headphone Input Terminal 输入流 即USB OUT->本终端 本终端对应输入流 */0x00, /* bAssocTerminal */UAC_SPK_CH, /* bNrChannels 1个通道 */0x04,0x00, /* wChannelConfig Center Front channel. */0x00, /* iChannelNames 固定为0 */0x00, /* iTerminal 对应字符串描述符索引 *//* BasicAudioDevice-10.pdf P24 Table 5-5: Mono Feature Unit Descriptor* BasicAudioDevice-10.pdf P59 7.3.3.1.7 Headset Feature Unit ID2 Descriptor*/0x09, /* bLength */0x24, /* bDescriptorType 见audio10.pdf P99 Table A-4: Audio Class-specific Descriptor Types CS_INTERFACE=0x24 */0x06, /* bDescriptorSubtype 见audio10.pdf P100 Table A-5: Audio Class-Specific AC Interface Descriptor Subtypes FEATURE_UNIT=0x06 */SPK_FEATURE_TID, /* bUnitID */SPK_INPUT_TID, /* bSourceID */0x01, /* bControlSize *//**A bit set to 1 indicates that the mentionedControl is supported for master channel0:D0: MuteD1: VolumeD2: BassD3: MidD4: TrebleD5: Graphic EqualizerD6: Automatic GainD7: DelayD8: Bass BoostD9: LoudnessD10..(n*8-1): Reserved*/0x01, /* bmaControls(0) Mute Control on Master Channel.*//*A bit set to 1 indicates that the mentionedControl is supported for logical channel 1 */0x02, /* bmaControls(1) Volume Control on Center Front channel */0x00, /* iFeature 对应字符串描述符索引 *//* BasicAudioDevice-10.pdf P25 Table 5-7: Headphone Output Terminal ID3 Descriptor* BasicAudioDevice-10.pdf P67 7.3.3.1.16 Headset Output Terminal ID3 Descriptor*/0x09, /* bLength */0x24, /* bDescriptorType 见audio10.pdf P99 Table A-4: Audio Class-specific Descriptor Types CS_INTERFACE=0x24 */0x03, /* bDescriptorSubtype 见audio10.pdf P100 Table A-5: Audio Class-Specific AC Interface Descriptor Subtypes OUTPUT_TERMINAL=0x03 */SPK_OUTPUT_TID, /* bTerminalID */0x01, 0x03, /* 0x0301扬声器 0x0302耳机 Headphones Terminal Type (0x0302) 本终端->扬声器输出 本终端对应扬声器 */0x00, /* bAssocTerminal */SPK_FEATURE_TID, /* bSourceID */0x00, /* iTerminal *//* BasicAudioDevice-10.pdf P59 7.3.3.1.6 Headset Microphone Input Terminal ID4 Descriptor* BasicAudioDevice-10.pdf P40 6.3.3.1.3 Microphone Input Terminal ID4 Descriptor* BasicAudioDevice-10.pdf P22 Table 5-3: Mono Input Terminal Descriptor*/0x0C, /* bLength */0x24, /* bDescriptorType 见audio10.pdf P99 Table A-4: Audio Class-specific Descriptor Types CS_INTERFACE=0x24 */0x02, /* bDescriptorSubtype 见audio10.pdf P100 Table A-5: Audio Class-Specific AC Interface Descriptor Subtypes INPUT_TERMINAL=0x02 */MIC_INPUT_TID,/* bTerminalID TID=4*/0x01,0x02, /* wTerminalType TT Terminal is Microphone. 麦克风输入->本终端 本终端对应麦克风 */0x00, /* bAssocTerminal */UAC_MIC_CH, /* bNrChannels 1个通道 */0x00,0x00, /* wChannelConfig Center Front channel. @todo 0x0000改为0004*/0x00, /* iChannelNames 固定为0 */0x00, /* iTerminal 对应字符串描述符索引 *//** BasicAudioDevice-10.pdf P60 7.3.3.1.10 Headset Feature Unit ID5 Descriptor*/0x09, /* bLength */0x24, /* bDescriptorType 见audio10.pdf P99 Table A-4: Audio Class-specific Descriptor Types CS_INTERFACE=0x24 */0x06, /* bDescriptorSubtype 见audio10.pdf P100 Table A-5: Audio Class-Specific AC Interface Descriptor Subtypes FEATURE_UNIT=0x06 */MIC_FEATURE_TID, /* bUnitID */MIC_INPUT_TID, /* bSourceID */0x01, /* bControlSize 这里配置不对会枚举失败 *//**A bit set to 1 indicates that the mentionedControl is supported for master channel0:D0: MuteD1: VolumeD2: BassD3: MidD4: TrebleD5: Graphic EqualizerD6: Automatic GainD7: DelayD8: Bass BoostD9: LoudnessD10..(n*8-1): Reserved*/0x43, /* bmaControls(0) Mute Control on Master Channel.*//*A bit set to 1 indicates that the mentionedControl is supported for logical channel 1 */0x00, /* bmaControls(1) Volume Control on Center Front channel */0x00, /* iFeature 对应字符串描述符索引 *//* BasicAudioDevice-10.pdf P66 Table 7-12: Headset Selector Unit ID9 Descriptor for HS2 */0x07, /* bLength */0x24, /* bDescriptorType 见audio10.pdf P99 Table A-4: Audio Class-specific Descriptor Types CS_INTERFACE=0x24 */0x05, /* bDescriptorSubtype 见audio10.pdf P100 Table A-5: Audio Class-Specific AC Interface Descriptor Subtypes SELECTOR_UNIT=0x05 */MIC_SEL_TID, /* bUnitID */0x01, /* bNrInPins */MIC_FEATURE_TID, /* baSourceID(1) */0x00, /* iSelector *//** BasicAudioDevice-10.pdf P67 7.3.3.1.17 Headset Output Terminal ID6 Descriptor*/0x09, /* bLength */0x24, /* bDescriptorType 见audio10.pdf P99 Table A-4: Audio Class-specific Descriptor Types CS_INTERFACE=0x24 */0x03, /* bDescriptorSubtype 见audio10.pdf P100 Table A-5: Audio Class-Specific AC Interface Descriptor Subtypes OUTPUT_TERMINAL=0x03 */MIC_OUTPUT_TID, /* bTerminalID */0x01,0x01, /* wTerminalType USB Streaming Terminal Type 本终端->USB IN 本终端对应输出流*/0x02, /* bAssocTerminal */MIC_SEL_TID, /* bSourceID */0x00, /* iTerminal *//********************************************************* SPK流部分*******************************************************//* 接口描述符* usb_20.pdf P268 Table 9-12. Standard Interface Descriptor* BasicAudioDevice-10.pdf P30 Table 5-13: Headphone Standard AS Interface Descriptor (Alt. Set. 0)*/0x09, /* bLength */0x04, /* bDescriptorType INTERFACE */SPK_AS_ITF, /* bInterfaceNumber */0x00, /* bAlternateSetting */0x00, /* bNumEndpoints */0x01, /* bInterfaceClass 见audio10.pdf P99 Table A-1: Audio Interface Class Code AUDIO=1 */0x02, /* bInterfaceSubClass 见audio10.pdf P99 Table A-2: Audio Interface Subclass Codes AUDIOSTREAMING=0x02 */0x00, /* bInterfaceProtocol 见audio10.pdf P99 Table A-3: Audio Interface Protocol Codes PR_PROTOCOL_UNDEFINED = 0x00 */0x00, /* iInterface *//* 接口描述符* usb_20.pdf P268 Table 9-12. Standard Interface DescriptorBasicAudioDevice-10.pdf P31 Table 5-14: Headphone Standard AS Interface Descriptor (Alt. Set .1)*/0x09, /* bLength */0x04, /* bDescriptorType INTERFACE */SPK_AS_ITF, /* bInterfaceNumber */0x01, /* bAlternateSetting */0x01, /* bNumEndpoints 一个端点 */0x01, /* bInterfaceClass 见audio10.pdf P99 Table A-1: Audio Interface Class Code AUDIO=1 */0x02, /* bInterfaceSubClass 见audio10.pdf P99 Table A-2: Audio Interface Subclass Codes AUDIOSTREAMING=0x02 */0x00, /* bInterfaceProtocol 见audio10.pdf P99 Table A-3: Audio Interface Protocol Codes PR_PROTOCOL_UNDEFINED = 0x00 */0x00, /* iInterface *//** BasicAudioDevice-10.pdf P31 Table 5-15: Headphone Class-specific AS General Interface Descriptor*/0x07, /* bLength */0x24, /* bDescriptorType 见audio10.pdf P99 Table A-4: Audio Class-specific Descriptor Types CS_INTERFACE=0x24 */0x01, /* bDescriptorSubtype 见audio10.pdf P100 Table A-6: Audio Class-Specific AS Interface Descriptor Subtypes AS_GENERAL=0x01 */SPK_INPUT_TID, /* bTerminalLink */0x01, /* bDelay Total interface delay, expressed in frames. Not used and shall be set to 0x00 */0x01,0x00, /* wFormatTag PCM Format *//** BasicAudioDevice-10.pdf P32 Table 5-16: Mono Headphone Type I Format Type Descriptor*/0x0B, /* bLength */0x24, /* bDescriptorType 见audio10.pdf P99 Table A-4: Audio Class-specific Descriptor Types CS_INTERFACE=0x24 */0x02, /* bDescriptorSubtype 见audio10.pdf P100 Table A-6: Audio Class-Specific AS Interface Descriptor Subtypes FORMAT_TYPE=0x02 */0x01, /* bFormatType 见frmts10.pdf P20 Table A-4: Format Type Codes FORMAT_TYPE_I=0x01 */UAC_SPK_CH, /* bNrChannels One channel. */(UAC_SPK_BIT_RES/8)*UAC_SPK_CH, /* bSubFrameSize Two bytes per audio subframe. */UAC_SPK_BIT_RES, /* bBitResolution 16 bits per sample */0x01, /* bSamFreqType One frequency supported. */UVC_MAKE_U24(UAC_SPK_SAMP_REQ), /* tSamFreq *//* 端点描述符* usb_20.pdf P269 Table 9-13. Standard Endpoint Descriptor* BasicAudioDevice-10.pdf P33 Table 5-18: Mono Headphone Standard AS Audio Data Endpoint Descriptor*/0x09, /* bLength */0x05, /* bDescriptorType 见usb_20.pdf P251 Table 9-5. Descriptor Types ENDPOINT=5 */SPK_OUT_EP, /* bEndpointAddress */0x09, /* bmAttributes b[1:0] 01 = Isochronous, b[3:2] 11 = Synchronous */UVC_MAKE_WORD((UAC_SPK_SAMP_REQ/1000)*(UAC_SPK_BIT_RES/8)*UAC_SPK_CH),/* wMaxPacketSize */0x04, /* bInterval 1ms一包 */0x00, /* bRefresh */0x00, /* bSynchAddress *//** BasicAudioDevice-10.pdf P33 Table 5-20: Headphone Class-specific Isoc. Audio Data Endpoint Descriptor*/0x07, /* bLength */0x25, /* bDescriptorType 见audio10.pdf P99 Table A-4: Audio Class-specific Descriptor Types CS_ENDPOINT=0x25 */0x01, /* bDescriptorSubtype 见audio10.pdf P101 Table A-8: Audio Class-Specific Endpoint Descriptor Subtypes EP_GENERAL=0x01. */0x00, /* bmAttributes No sampling frequency control, no pitch control, no packet padding.*/0x00, /* bLockDelayUnits */0x00, 0x00, /* wLockDelay *//********************************************************* MIC流部分*******************************************************//* 接口描述符* usb_20.pdf P268 Table 9-12. Standard Interface Descriptor* BasicAudioDevice-10.pdf P30 Table 5-13: Headphone Standard AS Interface Descriptor (Alt. Set. 0)*/0x09, /* bLength */0x04, /* bDescriptorType INTERFACE */MIC_AS_ITF, /* bInterfaceNumber */0x00, /* bAlternateSetting */0x00, /* bNumEndpoints */0x01, /* bInterfaceClass 见audio10.pdf P99 Table A-1: Audio Interface Class Code AUDIO=1 */0x02, /* bInterfaceSubClass 见audio10.pdf P99 Table A-2: Audio Interface Subclass Codes AUDIOSTREAMING=0x02 */0x00, /* bInterfaceProtocol 见audio10.pdf P99 Table A-3: Audio Interface Protocol Codes PR_PROTOCOL_UNDEFINED = 0x00 */0x00, /* iInterface *//* 接口描述符* usb_20.pdf P268 Table 9-12. Standard Interface DescriptorBasicAudioDevice-10.pdf P31 Table 5-14: Headphone Standard AS Interface Descriptor (Alt. Set .1)*/0x09, /* bLength */0x04, /* bDescriptorType INTERFACE */MIC_AS_ITF, /* bInterfaceNumber */0x01, /* bAlternateSetting */0x01, /* bNumEndpoints 一个端点 */0x01, /* bInterfaceClass 见audio10.pdf P99 Table A-1: Audio Interface Class Code AUDIO=1 */0x02, /* bInterfaceSubClass 见audio10.pdf P99 Table A-2: Audio Interface Subclass Codes AUDIOSTREAMING=0x02 */0x00, /* bInterfaceProtocol 见audio10.pdf P99 Table A-3: Audio Interface Protocol Codes PR_PROTOCOL_UNDEFINED = 0x00 */0x00, /* iInterface *//** BasicAudioDevice-10.pdf P31 Table 5-15: Headphone Class-specific AS General Interface Descriptor*/0x07, /* bLength */0x24, /* bDescriptorType 见audio10.pdf P99 Table A-4: Audio Class-specific Descriptor Types CS_INTERFACE=0x24 */0x01, /* bDescriptorSubtype 见audio10.pdf P100 Table A-6: Audio Class-Specific AS Interface Descriptor Subtypes AS_GENERAL=0x01 */MIC_OUTPUT_TID, /* bTerminalLink */0x01, /* bDelay Total interface delay, expressed in frames. Not used and shall be set to 0x00 */0x01,0x00, /* wFormatTag PCM Format *//** BasicAudioDevice-10.pdf P32 Table 5-16: Mono Headphone Type I Format Type Descriptor*/0x0B, /* bLength */0x24, /* bDescriptorType 见audio10.pdf P99 Table A-4: Audio Class-specific Descriptor Types CS_INTERFACE=0x24 */0x02, /* bDescriptorSubtype 见audio10.pdf P100 Table A-6: Audio Class-Specific AS Interface Descriptor Subtypes FORMAT_TYPE=0x02 */0x01, /* bFormatType 见frmts10.pdf P20 Table A-4: Format Type Codes FORMAT_TYPE_I=0x01 */UAC_MIC_CH, /* bNrChannels One channel. */(UAC_MIC_BIT_RES/8)*UAC_MIC_CH, /* bSubFrameSize Two bytes per audio subframe. */UAC_MIC_BIT_RES, /* bBitResolution 16 bits per sample */0x01, /* bSamFreqType One frequency supported. */UVC_MAKE_U24(UAC_MIC_SAMP_REQ), /* tSamFreq *//* 端点描述符* usb_20.pdf P269 Table 9-13. Standard Endpoint Descriptor* BasicAudioDevice-10.pdf P33 Table 5-18: Mono Headphone Standard AS Audio Data Endpoint Descriptor*/0x09, /* bLength */0x05, /* bDescriptorType 见usb_20.pdf P251 Table 9-5. Descriptor Types ENDPOINT=5 */MIC_IN_EP, /* bEndpointAddress */0x05, /* bmAttributes b[1:0] 01 = Isochronous, b[3:2] 11 = Synchronous */UVC_MAKE_WORD((UAC_MIC_SAMP_REQ/1000)*(UAC_MIC_BIT_RES/8)*UAC_MIC_CH),/* wMaxPacketSize */0x04, /* bInterval 1ms一包 高速单位是微帧:2^(4-1)=8 间隔8个微帧发一包, 如果是全速则间隔是帧,2^(1-1)=1. */0x00, /* bRefresh */0x00, /* bSynchAddress *//** BasicAudioDevice-10.pdf P33 Table 5-20: Headphone Class-specific Isoc. Audio Data Endpoint Descriptor*/0x07, /* bLength */0x25, /* bDescriptorType 见audio10.pdf P99 Table A-4: Audio Class-specific Descriptor Types CS_ENDPOINT=0x25 */0x01, /* bDescriptorSubtype 见audio10.pdf P101 Table A-8: Audio Class-Specific Endpoint Descriptor Subtypes EP_GENERAL=0x01. */0x00, /* bmAttributes No sampling frequency control, no pitch control, no packet padding.*/0x00, /* bLockDelayUnits */0x00, 0x00, /* wLockDelay *//********************************************************* 以下是CDC部分 59*******************************************************//* Interface Association Descriptor */0x08, /* bLength */0x0B, /* bDescriptorType INTERFACE ASSOCIATION */CDC_DEMO_CTRL_ITF1, /* bFirstInterface*/0x02, /* bInterfaceCount*/0x02, /* bFunctionClass */0x02, /* bFunctionSubClass Communications and CDC Control */0x01, /* bFunctionProtocol Abstract Control Model*/0x00, /* iFunction*//* Interface Descriptors */0x09, /* bLength */0x04, /* bDescriptorType */CDC_DEMO_CTRL_ITF1, /* bInterfaceNumber */0x00, /* bAlternateSetting*/0x00, /* bNumEndpoints */0x02, /* bInterfaceClass Communications Interface Class */0x02, /* bInterfaceSubClass Abstract Control Model */0x01, /* bInterfaceProtocol AT Commands: V.250 etc */0x00, /* iInterface *//* Header Functional Descriptor */0x05, /* bFunctionLength */0x24, /* bDescriptorType CS_INTERFACE */0x00, /* bDescriptorSubtype Header Functional Descriptor */0x10,0x01, /* bcdCDC (0x0110)*//* Call Management Functional Descriptor */0x05, /* bFunctionLength */0x24, /* bDescriptorType CS_INTERFACE */0x01, /* bDescriptorSubtype Call Management Functional Descriptor */0x00, /* bmCapabilities */0x01, /* bDataInterface *//* ACM Functional Descriptor */0x04, /* bFunctionLength */0x24, /* bDescriptorType CS_INTERFACE */0x02, /* bDescriptorSubtype Abstract Control Management Functional Descriptor */0x02, /* bmCapabilities *//* Union Functional Descriptor */0x05, /* bFunctionLength */0x24, /* bDescriptorType CS_INTERFACE */0x06, /* bDescriptorSubtype Union Descriptor Functional Descriptor */0x00, /* bControlInterface */0x01, /* bSubordinateInterface0 *///0x07, /* bLength *///0x05, /* bDescriptorType T *///CDC_DEMO_CTRLEP1, /* bEndpointAddress D7: 0 = OUT 1 = IN D3..0:*///0x03, /* bmAttributes Bulk*///0x00, /* wMaxPacketSize 2 bit12:11 bit10:0*///0x02,//0x01, /* bInterval 2^(bInterval-1) SOF *//* Interface Descriptors */0x09, /* bLength */0x04, /* bDescriptorType */CDC_DEMO_DATA_ITF1, /* bInterfaceNumber */0x00, /* bAlternateSetting*/0x02, /* bNumEndpoints */0x0A, /* bInterfaceClass Data Interface Class */0x00, /* bInterfaceSubClass */0x00, /* bInterfaceProtocol */0x00, /* iInterface */0x07, /* bLength */0x05, /* bDescriptorType ENDPOINT */CDC_DEMO_INEP1, /* bEndpointAddress D7: 0 = OUT 1 = IN D3..0:*/0x02, /* bmAttributes Bulk*/0x00, /* wMaxPacketSize 2 bit12:11 bit10:0*/0x02,0x00, /* bInterval 2^(bInterval-1) SOF */0x07, /* bLength */0x05, /* bDescriptorType ENDPOINT */CDC_DEMO_OUTEP1, /* bEndpointAddress D7: 0 = OUT 1 = IN D3..0: */0x02, /* bmAttributes Bulk */0x00, /* wMaxPacketSize 2 bit12:11 bit10:0*/0x02,0x00, /* bInterval 2^(bInterval-1) SOF */};
如下是UsbTreeView抓到的描述符
Device Descriptor ----------------------bLength : 0x12 (18 bytes)bDescriptorType : 0x01 (Device Descriptor)bcdUSB : 0x200 (USB Version 2.0)bDeviceClass : 0xEF (Miscellaneous)bDeviceSubClass : 0x02bDeviceProtocol : 0x01 (IAD - Interface Association Descriptor)bMaxPacketSize0 : 0x40 (64 bytes)idVendor : 0x4C4A (Unknown Vendor)idProduct : 0x4C55bcdDevice : 0x0100iManufacturer : 0x01 (String Descriptor 1)Language 0x0409 : "xxxxx Technology"iProduct : 0x02 (String Descriptor 2)Language 0x0409 : "USB Composite Device"iSerialNumber : 0x00 (No String Descriptor)bNumConfigurations : 0x01 (1 Configuration)Data (HexDump) : 12 01 00 02 EF 02 01 40 4A 4C 55 4C 00 01 01 02 .......@JLUL....00 01 ..Configuration Descriptor -------------------bLength : 0x09 (9 bytes)bDescriptorType : 0x02 (Configuration Descriptor)wTotalLength : 0x023A (570 bytes)bNumInterfaces : 0x07 (7 Interfaces)bConfigurationValue : 0x01 (Configuration 1)iConfiguration : 0x00 (No String Descriptor)bmAttributes : 0x80D7: Reserved, set 1 : 0x01D6: Self Powered : 0x00 (no)D5: Remote Wakeup : 0x00 (no): Reserved, set 0 : 0x00MaxPower : 0xC8 (400 mA)Data (HexDump) : 09 02 3A 02 07 01 00 80 C8 08 0B 00 02 0E 03 00 ..:.............05 09 04 00 00 00 0E 01 00 05 0D 24 01 00 01 50 ...........$...P00 80 C3 C9 01 01 01 12 24 02 01 01 02 00 00 00 ........$.......00 00 00 00 00 03 0A 00 00 0B 24 05 02 01 00 00 ..........$.....02 7B 07 00 1D 24 06 03 70 33 F0 28 11 63 2E 4A .{...$..p3.(.c.JBA 2C 68 90 EB 33 40 16 08 01 02 04 FF FF FF FF .,h..3@.........00 09 24 03 05 01 01 00 04 00 09 04 01 00 00 0E ..$.............02 00 00 0F 24 01 01 B6 00 81 00 05 00 00 00 02 ....$...........00 00 0B 24 06 01 05 00 01 00 00 00 00 1E 24 07 ...$..........$.01 00 00 05 D0 02 00 00 2F 0D 00 00 5E 1A 00 20 ......../...^..1C 00 80 1A 06 00 01 80 1A 06 00 1E 24 07 02 00 ............$...60 03 E0 01 00 C0 EE 05 00 80 DD 0B 00 A8 0C 00 `...............80 1A 06 00 01 80 1A 06 00 1E 24 07 03 00 20 03 ..........$... .E0 01 00 40 7E 05 00 80 FC 0A 00 B8 0B 00 80 1A ...@~...........06 00 01 80 1A 06 00 1E 24 07 04 00 80 02 E0 01 ........$.......00 00 65 04 00 00 CA 08 00 60 09 00 80 1A 06 00 ..e......`......01 80 1A 06 00 1E 24 07 05 00 E0 01 40 01 00 80 ......$.....@...32 02 00 00 65 04 00 B0 04 00 80 1A 06 00 01 80 2...e...........1A 06 00 06 24 0D 01 01 04 09 04 01 01 01 0E 02 ....$...........00 00 07 05 81 05 FF 13 01 08 0B 02 03 01 02 00 ................07 09 04 02 00 00 01 01 00 07 0A 24 01 00 01 46 ...........$...F00 02 03 04 0C 24 02 01 01 01 00 01 04 00 00 00 .....$..........09 24 06 02 01 01 01 02 00 09 24 03 03 01 03 00 .$........$.....02 00 0C 24 02 04 01 02 00 01 00 00 00 00 09 24 ...$...........$06 05 04 01 43 00 00 07 24 05 07 01 05 00 09 24 ....C...$......$03 06 01 01 02 07 00 09 04 03 00 00 01 02 00 00 ................09 04 03 01 01 01 02 00 00 07 24 01 01 01 01 00 ..........$.....0B 24 02 01 01 02 10 01 80 3E 00 09 05 02 09 20 .$.......>.....00 04 00 00 07 25 01 00 00 00 00 09 04 04 00 00 .....%..........01 02 00 00 09 04 04 01 01 01 02 00 00 07 24 01 ..............$.06 01 01 00 0B 24 02 01 01 02 10 01 80 3E 00 09 .....$.......>..05 82 05 20 00 04 00 00 07 25 01 00 00 00 00 08 ... .....%......0B 05 02 02 02 01 00 09 04 05 00 00 02 02 01 00 ................05 24 00 10 01 05 24 01 00 01 04 24 02 02 05 24 .$....$....$...$06 00 01 09 04 06 00 02 0A 00 00 00 07 05 83 02 ................00 02 00 07 05 03 02 00 02 00 ..........IAD Descriptor --------------------bLength : 0x08 (8 bytes)bDescriptorType : 0x0B (Interface Association Descriptor)bFirstInterface : 0x00 (Interface 0)bInterfaceCount : 0x02 (2 Interfaces)bFunctionClass : 0x0E (Video)bFunctionSubClass : 0x03 (Video Interface Collection)bFunctionProtocol : 0x00 (PC_PROTOCOL_UNDEFINED)iFunction : 0x05 (String Descriptor 5)Language 0x0409 : "XXXX USB CAMERA"Data (HexDump) : 08 0B 00 02 0E 03 00 05 ........Interface Descriptor -----------------bLength : 0x09 (9 bytes)bDescriptorType : 0x04 (Interface Descriptor)bInterfaceNumber : 0x00 (Interface 0)bAlternateSetting : 0x00bNumEndpoints : 0x00 (Default Control Pipe only)bInterfaceClass : 0x0E (Video)bInterfaceSubClass : 0x01 (Video Control)bInterfaceProtocol : 0x00iInterface : 0x05 (String Descriptor 5)Language 0x0409 : "XXXX USB CAMERA"Data (HexDump) : 09 04 00 00 00 0E 01 00 05 .........Video Control Interface Header Descriptor -----bLength : 0x0D (13 bytes)bDescriptorType : 0x24 (Video Control Interface)bDescriptorSubtype : 0x01 (Video Control Header)bcdUVC : 0x0100 (UVC Version 1.00)wTotalLength : 0x0050 (80 bytes)dwClockFreq : 0x01C9C380 (30 MHz)bInCollection : 0x01 (1 VideoStreaming interface): 0x01 (Interface 1)Data (HexDump) : 0D 24 01 00 01 50 00 80 C3 C9 01 01 01 .$...P.......Video Control Input Terminal Descriptor ------bLength : 0x12 (18 bytes)bDescriptorType : 0x24 (Video Control Interface)bDescriptorSubtype : 0x02 (Input Terminal)bTerminalID : 0x01 (1)wTerminalType : 0x0201 (ITT_CAMERA)bAssocTerminal : 0x00 (Not associated with an Output Terminal)iTerminal : 0x00 (No String Descriptor)Camera Input Terminal Data:wObjectiveFocalLengthMin : 0x0000wObjectiveFocalLengthMax : 0x0000wOcularFocalLength : 0x0000bControlSize : 0x03 (3 bytes)bmControls : 0x0A, 0x00, 0x00D0 : 0 no - Scanning ModeD1 : 1 yes - Auto-Exposure ModeD2 : 0 no - Auto-Exposure PriorityD3 : 1 yes - Exposure Time (Absolute)D4 : 0 no - Exposure Time (Relative)D5 : 0 no - Focus (Absolute)D6 : 0 no - Focus (Relative)D7 : 0 no - Iris (Absolute)D8 : 0 no - Iris (Relative)D9 : 0 no - Zoom (Absolute)D10 : 0 no - Zoom (Relative)D11 : 0 no - Pan (Absolute)D12 : 0 no - Pan (Relative)D13 : 0 no - Roll (Absolute)D14 : 0 no - Roll (Relative)D15 : 0 no - Tilt (Absolute)D16 : 0 no - Tilt (Relative)D17 : 0 no - Focus AutoD18 : 0 no - ReservedD19 : 0 no - ReservedD20 : 0 no - ReservedD21 : 0 no - ReservedD22 : 0 no - ReservedD23 : 0 no - ReservedData (HexDump) : 12 24 02 01 01 02 00 00 00 00 00 00 00 00 03 0A .$..............00 00 ..Video Control Processing Unit Descriptor -----bLength : 0x0B (11 bytes)bDescriptorType : 0x24 (Video Control Interface)bDescriptorSubtype : 0x05 (Processing Unit)bUnitID : 0x02 (2)bSourceID : 0x01 (1)wMaxMultiplier : 0x0000bControlSize : 0x02 (2 bytes)bmControls : 0x7B, 0x07D0 : 1 yes - BrightnessD1 : 1 yes - ContrastD2 : 0 no - HueD3 : 1 yes - SaturationD4 : 1 yes - SharpnessD5 : 1 yes - GammaD6 : 1 yes - White Balance TemperatureD7 : 0 no - White Balance ComponentD8 : 1 yes - Backlight CompensationD9 : 1 yes - GainD10 : 1 yes - Power Line FrequencyD11 : 0 no - Hue, AutoD12 : 0 no - White Balance Temperature, AutoD13 : 0 no - White Balance Component, AutoD14 : 0 no - Digital MultiplierD15 : 0 no - Digital Multiplier LimitiProcessing : 0x00 (No String Descriptor)Data (HexDump) : 0B 24 05 02 01 00 00 02 7B 07 00 .$......{..Video Control Extension Unit Descriptor -----bLength : 0x1D (29 bytes)bDescriptorType : 0x24 (Video Control Interface)bDescriptorSubtype : 0x06 (Extension Unit)bUnitID : 0x03 (ID 3)guidExtensionCode : {28F03370-6311-4A2E-BA2C-6890EB334016}bNumControls : 0x08 (8 Controls)bNrInPins : 0x01 (1 Input Pin): 0x02bControlSize : 0x04 (4 bytes)bmControls : 0xFF, 0xFF, 0xFF, 0xFFD0 : 1 yes - Vendor-Specific (Optional)D1 : 1 yes - Vendor-Specific (Optional)D2 : 1 yes - Vendor-Specific (Optional)D3 : 1 yes - Vendor-Specific (Optional)D4 : 1 yes - Vendor-Specific (Optional)D5 : 1 yes - Vendor-Specific (Optional)D6 : 1 yes - Vendor-Specific (Optional)D7 : 1 yes - Vendor-Specific (Optional)D8 : 1 yes - Vendor-Specific (Optional)D9 : 1 yes - Vendor-Specific (Optional)D10 : 1 yes - Vendor-Specific (Optional)D11 : 1 yes - Vendor-Specific (Optional)D12 : 1 yes - Vendor-Specific (Optional)D13 : 1 yes - Vendor-Specific (Optional)D14 : 1 yes - Vendor-Specific (Optional)D15 : 1 yes - Vendor-Specific (Optional)D16 : 1 yes - Vendor-Specific (Optional)D17 : 1 yes - Vendor-Specific (Optional)D18 : 1 yes - Vendor-Specific (Optional)D19 : 1 yes - Vendor-Specific (Optional)D20 : 1 yes - Vendor-Specific (Optional)D21 : 1 yes - Vendor-Specific (Optional)D22 : 1 yes - Vendor-Specific (Optional)D23 : 1 yes - Vendor-Specific (Optional)D24 : 1 yes - Vendor-Specific (Optional)D25 : 1 yes - Vendor-Specific (Optional)D26 : 1 yes - Vendor-Specific (Optional)D27 : 1 yes - Vendor-Specific (Optional)D28 : 1 yes - Vendor-Specific (Optional)D29 : 1 yes - Vendor-Specific (Optional)D30 : 1 yes - Vendor-Specific (Optional)D31 : 1 yes - Vendor-Specific (Optional)iExtension : 0x00 (No String Descriptor)Data (HexDump) : 1D 24 06 03 70 33 F0 28 11 63 2E 4A BA 2C 68 90 .$..p3.(.c.J.,h.EB 33 40 16 08 01 02 04 FF FF FF FF 00 .3@..........Video Control Output Terminal Descriptor ------bLength : 0x09 (9 bytes)bDescriptorType : 0x24 (Video Control Interface)bDescriptorSubtype : 0x03 (Output Terminal)bTerminalID : 0x05 (5)wTerminalType : 0x0101 (TT_STREAMING)bAssocTerminal : 0x00 (Not associated with an Input Terminal)bSourceID : 0x04 (4)iTerminal : 0x00 (No String Descriptor)Data (HexDump) : 09 24 03 05 01 01 00 04 00 .$.......Interface Descriptor -----------------bLength : 0x09 (9 bytes)bDescriptorType : 0x04 (Interface Descriptor)bInterfaceNumber : 0x01 (Interface 1)bAlternateSetting : 0x00bNumEndpoints : 0x00 (Default Control Pipe only)bInterfaceClass : 0x0E (Video)bInterfaceSubClass : 0x02 (Video Streaming)bInterfaceProtocol : 0x00iInterface : 0x00 (No String Descriptor)Data (HexDump) : 09 04 01 00 00 0E 02 00 00 .........VC-Specific VS Video Input Header Descriptor -----bLength : 0x0F (15 bytes)bDescriptorType : 0x24 (Video Streaming Interface)bDescriptorSubtype : 0x01 (Input Header)bNumFormats : 0x01wTotalLength : 0x00B6 (182 bytes)bEndpointAddress : 0x81 (Direction=IN EndpointID=1)bmInfo : 0x00 (Dynamic Format Change not supported)bTerminalLink : 0x05 (Output Terminal ID 5)bStillCaptureMethod : 0x00 (No Still Capture)nbTriggerSupport : 0x00 (Hardware Triggering not supported)bTriggerUsage : 0x00 (Host will initiate still image capture)bControlSize : 0x02 (2 bytes each)Video Payload Format 1 : 0x00 0x00D0 : 0 no - Key Frame RateD1 : 0 no - P Frame RateD2 : 0 no - Compression QualityD3 : 0 no - Compression Window SizeD4 : 0 no - Generate Key FrameD5 : 0 no - Update Frame SegmentD6 : 0 no - ReservedD7 : 0 no - ReservedData (HexDump) : 0F 24 01 01 B6 00 81 00 05 00 00 00 02 00 00 .$.............Video Streaming MJPEG Format Type Descriptor ----bLength : 0x0B (11 bytes)bDescriptorType : 0x24 (Video Streaming Interface)bDescriptorSubtype : 0x06 (Format MJPEG)bFormatIndex : 0x01 (1)bNumFrameDescriptors : 0x05 (5)bmFlags : 0x00 (Sample size is not fixed)bDefaultFrameIndex : 0x01 (1)bAspectRatioX : 0x00bAspectRatioY : 0x00bmInterlaceFlags : 0x00D0 IL stream or variable: 0 (no)D1 Fields per frame : 0 (2 fields)D2 Field 1 first : 0 (no)D3 Reserved : 0Field pattern : 0 (Field 1 only)Display Mode : 0 (Bob only)bCopyProtect : 0x00 (No restrictions)Data (HexDump) : 0B 24 06 01 05 00 01 00 00 00 00 .$.........Video Streaming MJPEG Frame Type Descriptor -----This is the Default (optimum) Frame indexbLength : 0x1E (30 bytes)bDescriptorType : 0x24 (Video Streaming Interface)bDescriptorSubtype : 0x07 (MJPEG Frame Type)bFrameIndex : 0x01bmCapabilities : 0x00wWidth : 0x0500 (1280)wHeight : 0x02D0 (720)dwMinBitRate : 0x0D2F0000 (221184000 bps -> 27.648 MB/s)dwMaxBitRate : 0x1A5E0000 (442368000 bps -> 55.296 MB/s)dwMaxVideoFrameBufferSize: 0x001C2000 (1843200 bytes)dwDefaultFrameInterval : 0x00061A80 (40.0000 ms -> 25.0000 fps)bFrameIntervalType : 0x01 (1 discrete frame interval supported): if bFrameIntervalType is 1 then dwMinBitRate should equal dwMaxBitRate: 0x00061A80 (40.0000 ms -> 25.0000 fps)Data (HexDump) : 1E 24 07 01 00 00 05 D0 02 00 00 2F 0D 00 00 5E .$........./...^1A 00 20 1C 00 80 1A 06 00 01 80 1A 06 00 .. ...........Video Streaming MJPEG Frame Type Descriptor -----bLength : 0x1E (30 bytes)bDescriptorType : 0x24 (Video Streaming Interface)bDescriptorSubtype : 0x07 (MJPEG Frame Type)bFrameIndex : 0x02bmCapabilities : 0x00wWidth : 0x0360 (864)wHeight : 0x01E0 (480)dwMinBitRate : 0x05EEC000 (99532800 bps -> 12.441 MB/s)dwMaxBitRate : 0x0BDD8000 (199065600 bps -> 24.883 MB/s)dwMaxVideoFrameBufferSize: 0x000CA800 (829440 bytes)dwDefaultFrameInterval : 0x00061A80 (40.0000 ms -> 25.0000 fps)bFrameIntervalType : 0x01 (1 discrete frame interval supported): if bFrameIntervalType is 1 then dwMinBitRate should equal dwMaxBitRate: 0x00061A80 (40.0000 ms -> 25.0000 fps)Data (HexDump) : 1E 24 07 02 00 60 03 E0 01 00 C0 EE 05 00 80 DD .$...`..........0B 00 A8 0C 00 80 1A 06 00 01 80 1A 06 00 ..............Video Streaming MJPEG Frame Type Descriptor -----bLength : 0x1E (30 bytes)bDescriptorType : 0x24 (Video Streaming Interface)bDescriptorSubtype : 0x07 (MJPEG Frame Type)bFrameIndex : 0x03bmCapabilities : 0x00wWidth : 0x0320 (800)wHeight : 0x01E0 (480)dwMinBitRate : 0x057E4000 (92160000 bps -> 11.520 MB/s)dwMaxBitRate : 0x0AFC8000 (184320000 bps -> 23.40 MB/s)dwMaxVideoFrameBufferSize: 0x000BB800 (768000 bytes)dwDefaultFrameInterval : 0x00061A80 (40.0000 ms -> 25.0000 fps)bFrameIntervalType : 0x01 (1 discrete frame interval supported): if bFrameIntervalType is 1 then dwMinBitRate should equal dwMaxBitRate: 0x00061A80 (40.0000 ms -> 25.0000 fps)Data (HexDump) : 1E 24 07 03 00 20 03 E0 01 00 40 7E 05 00 80 FC .$... ....@~....0A 00 B8 0B 00 80 1A 06 00 01 80 1A 06 00 ..............Video Streaming MJPEG Frame Type Descriptor -----bLength : 0x1E (30 bytes)bDescriptorType : 0x24 (Video Streaming Interface)bDescriptorSubtype : 0x07 (MJPEG Frame Type)bFrameIndex : 0x04bmCapabilities : 0x00wWidth : 0x0280 (640)wHeight : 0x01E0 (480)dwMinBitRate : 0x04650000 (73728000 bps -> 9.216 MB/s)dwMaxBitRate : 0x08CA0000 (147456000 bps -> 18.432 MB/s)dwMaxVideoFrameBufferSize: 0x00096000 (614400 bytes)dwDefaultFrameInterval : 0x00061A80 (40.0000 ms -> 25.0000 fps)bFrameIntervalType : 0x01 (1 discrete frame interval supported): if bFrameIntervalType is 1 then dwMinBitRate should equal dwMaxBitRate: 0x00061A80 (40.0000 ms -> 25.0000 fps)Data (HexDump) : 1E 24 07 04 00 80 02 E0 01 00 00 65 04 00 00 CA .$.........e....08 00 60 09 00 80 1A 06 00 01 80 1A 06 00 ..`...........Video Streaming MJPEG Frame Type Descriptor -----bLength : 0x1E (30 bytes)bDescriptorType : 0x24 (Video Streaming Interface)bDescriptorSubtype : 0x07 (MJPEG Frame Type)bFrameIndex : 0x05bmCapabilities : 0x00wWidth : 0x01E0 (480)wHeight : 0x0140 (320)dwMinBitRate : 0x02328000 (36864000 bps -> 4.608 MB/s)dwMaxBitRate : 0x04650000 (73728000 bps -> 9.216 MB/s)dwMaxVideoFrameBufferSize: 0x0004B000 (307200 bytes)dwDefaultFrameInterval : 0x00061A80 (40.0000 ms -> 25.0000 fps)bFrameIntervalType : 0x01 (1 discrete frame interval supported): if bFrameIntervalType is 1 then dwMinBitRate should equal dwMaxBitRate: 0x00061A80 (40.0000 ms -> 25.0000 fps)Data (HexDump) : 1E 24 07 05 00 E0 01 40 01 00 80 32 02 00 00 65 .$.....@...2...e04 00 B0 04 00 80 1A 06 00 01 80 1A 06 00 ..............VS Color Matching Descriptor Descriptor -------bLength : 0x06 (6 bytes)bDescriptorType : 0x24 (Video Streaming Interface)bDescriptorSubtype : 0x0D (Color Matching)bColorPrimaries : 0x01 (BT.709, sRGB)bTransferCharacteristics : 0x01 (BT.709)bMatrixCoefficients : 0x04 (SMPTE 170M)Data (HexDump) : 06 24 0D 01 01 04 .$....Interface Descriptor -----------------bLength : 0x09 (9 bytes)bDescriptorType : 0x04 (Interface Descriptor)bInterfaceNumber : 0x01 (Interface 1)bAlternateSetting : 0x01bNumEndpoints : 0x01 (1 Endpoint)bInterfaceClass : 0x0E (Video)bInterfaceSubClass : 0x02 (Video Streaming)bInterfaceProtocol : 0x00iInterface : 0x00 (No String Descriptor)Data (HexDump) : 09 04 01 01 01 0E 02 00 00 .........Endpoint Descriptor -----------------bLength : 0x07 (7 bytes)bDescriptorType : 0x05 (Endpoint Descriptor)bEndpointAddress : 0x81 (Direction=IN EndpointID=1)bmAttributes : 0x05 (TransferType=Isochronous SyncType=Asynchronous EndpointType=Data)wMaxPacketSize : 0x13FFBits 15..13 : 0x00 (reserved, must be zero)Bits 12..11 : 0x02 (2 additional transactions per microframe -> allows 683..1024 bytes per packet)Bits 10..0 : 0x3FF (1023 bytes per packet)bInterval : 0x01 (1 microframe -> 0.125 ms)Data (HexDump) : 07 05 81 05 FF 13 01 .......IAD Descriptor --------------------bLength : 0x08 (8 bytes)bDescriptorType : 0x0B (Interface Association Descriptor)bFirstInterface : 0x02 (Interface 2)bInterfaceCount : 0x03 (3 Interfaces)bFunctionClass : 0x01 (Audio)bFunctionSubClass : 0x02 (Audio Streaming)bFunctionProtocol : 0x00iFunction : 0x07 (String Descriptor 7)Language 0x0409 : "USB Audio"Data (HexDump) : 08 0B 02 03 01 02 00 07 ........Interface Descriptor -----------------bLength : 0x09 (9 bytes)bDescriptorType : 0x04 (Interface Descriptor)bInterfaceNumber : 0x02 (Interface 2)bAlternateSetting : 0x00bNumEndpoints : 0x00 (Default Control Pipe only)bInterfaceClass : 0x01 (Audio)bInterfaceSubClass : 0x01 (Audio Control)bInterfaceProtocol : 0x00iInterface : 0x07 (String Descriptor 7)Language 0x0409 : "USB Audio"Data (HexDump) : 09 04 02 00 00 01 01 00 07 .........Audio Control Interface Header Descriptor ------bLength : 0x0A (10 bytes)bDescriptorType : 0x24 (Audio Interface Descriptor)bDescriptorSubtype : 0x01 (Header)bcdADC : 0x0100wTotalLength : 0x0046 (70 bytes)bInCollection : 0x02: 0x03: 0x04Data (HexDump) : 0A 24 01 00 01 46 00 02 03 04 .$...F....Audio Control Input Terminal Descriptor -------bLength : 0x0C (12 bytes)bDescriptorType : 0x24 (Audio Interface Descriptor)bDescriptorSubtype : 0x02 (Input Terminal)bTerminalID : 0x01wTerminalType : 0x0101 (USB Streaming)bAssocTerminal : 0x00bNrChannels : 0x01 (1 channel)wChannelConfig : 0x0004 (C)iChannelNames : 0x00 (No String Descriptor)iTerminal : 0x00 (No String Descriptor)Data (HexDump) : 0C 24 02 01 01 01 00 01 04 00 00 00 .$..........Audio Control Feature Unit Descriptor --------bLength : 0x09 (9 bytes)bDescriptorType : 0x24 (Audio Interface Descriptor)bDescriptorSubtype : 0x06 (Feature Unit)bUnitID : 0x02 (2)bSourceID : 0x01 (1)bControlSize : 0x01 (1 byte per control): 0x01D0: Mute : 1D1: Volume : 0D2: Bass : 0D3: Mid : 0D4: Treble : 0D5: Graphic Equalizer : 0D6: Automatic Gain : 0D7: Delay : 0: 0x02D0: Mute : 0D1: Volume : 1D2: Bass : 0D3: Mid : 0D4: Treble : 0D5: Graphic Equalizer : 0D6: Automatic Gain : 0D7: Delay : 0iFeature : 0x00 (No String Descriptor)Data (HexDump) : 09 24 06 02 01 01 01 02 00 .$.......Audio Control Output Terminal Descriptor ------bLength : 0x09 (9 bytes)bDescriptorType : 0x24 (Audio Interface Descriptor)bDescriptorSubtype : 0x03 (Output Terminal)bTerminalID : 0x03wTerminalType : 0x0301 (Speaker)bAssocTerminal : 0x00 (0)bSourceID : 0x02 (2)iTerminal : 0x00 (No String Descriptor)Data (HexDump) : 09 24 03 03 01 03 00 02 00 .$.......Audio Control Input Terminal Descriptor -------bLength : 0x0C (12 bytes)bDescriptorType : 0x24 (Audio Interface Descriptor)bDescriptorSubtype : 0x02 (Input Terminal)bTerminalID : 0x04wTerminalType : 0x0201 (Microphone)bAssocTerminal : 0x00bNrChannels : 0x01 (1 channel)wChannelConfig : 0x0000 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Endpoint)bInterfaceClass : 0x01 (Audio)bInterfaceSubClass : 0x02 (Audio Streaming)bInterfaceProtocol : 0x00iInterface : 0x00 (No String Descriptor)Data (HexDump) : 09 04 03 01 01 01 02 00 00 .........Audio Streaming Interface Descriptor ---------bLength : 0x07 (7 bytes)bDescriptorType : 0x24 (Audio Interface Descriptor)bDescriptorSubtype : 0x01 (AS_GENERAL)bTerminalLink : 0x01 (Terminal ID 1)bDelay : 0x01 (1 frame)wFormatTag : 0x0001 (PCM)Data (HexDump) : 07 24 01 01 01 01 00 .$.....Audio Streaming Format Type Descriptor --------bLength : 0x0B (11 bytes)bDescriptorType : 0x24 (Audio Interface Descriptor)bDescriptorSubtype : 0x02 (Format Type)bFormatType : 0x01 (FORMAT_TYPE_I)bNrChannels : 0x01 (1 channel)bSubframeSize : 0x02 (2 bytes per subframe)bBitResolution : 0x10 (16 bits per sample)bSamFreqType : 0x01 (supports 1 sample frequence): 0x03E80 (16000 Hz)Data (HexDump) : 0B 24 02 01 01 02 10 01 80 3E 00 .$.......>.Endpoint Descriptor -----------------bLength : 0x09 (9 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Streaming Format Type Descriptor --------bLength : 0x0B (11 bytes)bDescriptorType : 0x24 (Audio Interface Descriptor)bDescriptorSubtype : 0x02 (Format Type)bFormatType : 0x01 (FORMAT_TYPE_I)bNrChannels : 0x01 (1 channel)bSubframeSize : 0x02 (2 bytes per subframe)bBitResolution : 0x10 (16 bits per sample)bSamFreqType : 0x01 (supports 1 sample frequence): 0x03E80 (16000 Hz)Data (HexDump) : 0B 24 02 01 01 02 10 01 80 3E 00 .$.......>.Endpoint Descriptor -----------------bLength : 0x09 (9 bytes)bDescriptorType : 0x05 (Endpoint Descriptor)bEndpointAddress : 0x82 (Direction=IN EndpointID=2)bmAttributes : 0x05 (TransferType=Isochronous SyncType=Asynchronous EndpointType=Data)wMaxPacketSize : 0x0020Bits 15..13 : 0x00 (reserved, must be zero)Bits 12..11 : 0x00 (0 additional transactions per microframe -> allows 1..1024 bytes per packet)Bits 10..0 : 0x20 (32 bytes per packet)bInterval : 0x04 (4 ms)bRefresh : 0x00bSynchAddress : 0x00Data (HexDump) : 09 05 82 05 20 00 04 00 00 .... ....Audio Data 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(Interface)bDescriptorSubType : 0x02 (Abstract Control Management Functional Descriptor)bmCapabilities : 0x02: 0x00 (Reserved)D3 : 0x00 (not supports the notification Network_Connection)D2 : 0x00 (not supports the request Send_Break)D1 : 0x01 (supports the request combination of Set_Line_Coding, Set_Control_Line_State, Get_Line_Coding, and the notification Serial_State)D0 : 0x00 (not supports the request combination of Set_Comm_Feature, Clear_Comm_Feature, and Get_Comm_Feature)Data (HexDump) : 04 24 02 02 .$..CDC Interface Descriptor ---------------bFunctionLength : 0x05 (5 bytes)bDescriptorType : 0x24 (Interface)bDescriptorSubType : 0x06 (Union Functional Descriptor)bControlInterface : 0x00: 0x01Data (HexDump) : 05 24 06 00 01 .$...Interface Descriptor -----------------bLength : 0x09 (9 bytes)bDescriptorType : 0x04 (Interface Descriptor)bInterfaceNumber : 0x06 (Interface 6)bAlternateSetting : 0x00bNumEndpoints : 0x02 (2 Endpoints)bInterfaceClass : 0x0A (CDC-Data)bInterfaceSubClass : 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见五.抓包文件分享,不再赘述
各设备枚举过程可以参考之前的文章和规格书。
使用bushound抓包枚举过程见文件
UVC+UAC+CDC.txt
链接：https://pan.baidu.com/s/1aDbA72jKDCrlwGNIkSutBg?pwd=wnvf
提取码：wnvf
以上分享了一个完整的UVC+UAC的扬声器+UAC麦克风+CDC的实例，描述符可以直接使用，其他参考单独的设备的实现即可。USB描述符的正确是能顺利枚举的首要条件，枚举完成了，基本就成功了一半了。有时候描述符一丁点不对就会导致枚举失败，所以有时候这些问题会困扰很久，有一个正确的描述符作为参考显得很有价值。故特分享此案例。
