On Mon Dec 1 17:06:53 2025 +0100, John Bauer wrote:
> In Video4Linux, a negative value in V4L2_CID_ZOOM_CONTINUOUS,
> V4L2_CID_PAN_SPEED and V4L2_CID_TILT_SPEED indicates a movement in the
> "opposite" direction to the standard direction.
>
> Currently, we were using -UVC_GET_MIN as the negative value, which
> resulted in the camera moving in the slowest possible speed.
>
> Quirk the driver to return -UVC_GET_MAX for the affected controls.
>
> Note that the get/set function from the mapping cannot be used for
> this, because we need to use the information from GET_MAX for GET_MIN
> and hacking uvc_ctrl_populate_cache seems like a worse alternative.
>
> Tested on OBSBOT Tiny 2.
>
> lsusb -v:
>
> Bus 008 Device 002: ID 3564:fef8 Remo Tech Co., Ltd. OBSBOT Tiny 2
> Negotiated speed: SuperSpeed (5Gbps)
> Device Descriptor:
> bLength 18
> bDescriptorType 1
> bcdUSB 3.10
> bDeviceClass 239 Miscellaneous Device
> bDeviceSubClass 2 [unknown]
> bDeviceProtocol 1 Interface Association
> bMaxPacketSize0 9
> idVendor 0x3564 Remo Tech Co., Ltd.
> idProduct 0xfef8 OBSBOT Tiny 2
> bcdDevice 4.09
> iManufacturer 1 Remo Tech Co., Ltd.
> iProduct 2 OBSBOT Tiny 2
> iSerial 0
> bNumConfigurations 1
> Configuration Descriptor:
> bLength 9
> bDescriptorType 2
> wTotalLength 0x04fc
> bNumInterfaces 4
> bConfigurationValue 1
> iConfiguration 4 OBSBOT Multifunction
> bmAttributes 0xc0
> Self Powered
> MaxPower 0mA
> Interface Association:
> bLength 8
> bDescriptorType 11
> bFirstInterface 0
> bInterfaceCount 2
> bFunctionClass 14 Video
> bFunctionSubClass 3 Video Interface Collection
> bFunctionProtocol 0
> iFunction 5 OBSBOT Tiny 2 StreamCamera
> Interface Descriptor:
> bLength 9
> bDescriptorType 4
> bInterfaceNumber 0
> bAlternateSetting 0
> bNumEndpoints 1
> bInterfaceClass 14 Video
> bInterfaceSubClass 1 Video Control
> bInterfaceProtocol 0
> iInterface 5 OBSBOT Tiny 2 StreamCamera
> VideoControl Interface Descriptor:
> bLength 13
> bDescriptorType 36
> bDescriptorSubtype 1 (HEADER)
> bcdUVC 1.00
> wTotalLength 0x0050
> dwClockFrequency 48.000000MHz
> 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 0x00023e3e
> Auto-Exposure Mode
> Auto-Exposure Priority
> Exposure Time (Absolute)
> Exposure Time (Relative)
> Focus (Absolute)
> Zoom (Absolute)
> Zoom (Relative)
> PanTilt (Absolute)
> PanTilt (Relative)
> Roll (Absolute)
> Focus, Auto
> VideoControl Interface Descriptor:
> bLength 11
> bDescriptorType 36
> bDescriptorSubtype 5 (PROCESSING_UNIT)
> Warning: Descriptor too short
> bUnitID 3
> bSourceID 1
> wMaxMultiplier 400
> bControlSize 2
> bmControls 0x0000f7df
> Brightness
> Contrast
> Hue
> Saturation
> Sharpness
> White Balance Temperature
> White Balance Component
> Backlight Compensation
> Gain
> Power Line Frequency
> White Balance Temperature, Auto
> White Balance Component, Auto
> Digital Multiplier
> Digital Multiplier Limit
> 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 2
> guidExtensionCode {9a1e7291-6843-4683-6d92-39bc7906ee49}
> bNumControls 19
> bNrInPins 1
> baSourceID( 0) 3
> bControlSize 4
> bmControls( 0) 0xff
> bmControls( 1) 0xff
> bmControls( 2) 0x04
> bmControls( 3) 0x00
> iExtension 0
> VideoControl Interface Descriptor:
> bLength 9
> bDescriptorType 36
> bDescriptorSubtype 3 (OUTPUT_TERMINAL)
> bTerminalID 7
> wTerminalType 0x0101 USB Streaming
> bAssocTerminal 0
> bSourceID 2
> iTerminal 0
> Endpoint Descriptor:
> bLength 7
> bDescriptorType 5
> bEndpointAddress 0x84 EP 4 IN
> bmAttributes 3
> Transfer Type Interrupt
> Synch Type None
> Usage Type Data
> wMaxPacketSize 0x0010 1x 16 bytes
> bInterval 8
> bMaxBurst 0
> VideoControl Endpoint Descriptor:
> bLength 5
> bDescriptorType 37
> bDescriptorSubtype 3 (EP_INTERRUPT)
> wMaxTransferSize 16
> Interface Descriptor:
> bLength 9
> bDescriptorType 4
> bInterfaceNumber 1
> bAlternateSetting 0
> bNumEndpoints 1
> bInterfaceClass 14 Video
> bInterfaceSubClass 2 Video Streaming
> bInterfaceProtocol 0
> iInterface 6 Video Streaming
> VideoStreaming Interface Descriptor:
> bLength 16
> bDescriptorType 36
> bDescriptorSubtype 1 (INPUT_HEADER)
> bNumFormats 3
> wTotalLength 0x03f8
> bEndpointAddress 0x81 EP 1 IN
> bmInfo 0
> bTerminalLink 7
> bStillCaptureMethod 0
> bTriggerSupport 0
> bTriggerUsage 0
> bControlSize 1
> bmaControls( 0) 4
> bmaControls( 1) 0
> bmaControls( 2) 4
> VideoStreaming Interface Descriptor:
> bLength 11
> bDescriptorType 36
> bDescriptorSubtype 6 (FORMAT_MJPEG)
> bFormatIndex 1
> bNumFrameDescriptors 6
> bFlags 0
> Fixed-size samples: No
> bDefaultFrameIndex 1
> 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 62
> bDescriptorType 36
> bDescriptorSubtype 7 (FRAME_MJPEG)
> bFrameIndex 1
> bmCapabilities 0x00
> Still image unsupported
> wWidth 1920
> wHeight 1080
> dwMinBitRate 995328000
> dwMaxBitRate 1990656000
> dwMaxVideoFrameBufferSize 4147200
> dwDefaultFrameInterval 333333
> bFrameIntervalType 9
> dwFrameInterval( 0) 166666
> dwFrameInterval( 1) 166833
> dwFrameInterval( 2) 200000
> dwFrameInterval( 3) 333333
> dwFrameInterval( 4) 333666
> dwFrameInterval( 5) 400000
> dwFrameInterval( 6) 416666
> dwFrameInterval( 7) 500000
> dwFrameInterval( 8) 666666
> VideoStreaming Interface Descriptor:
> bLength 50
> bDescriptorType 36
> bDescriptorSubtype 7 (FRAME_MJPEG)
> bFrameIndex 2
> bmCapabilities 0x00
> Still image unsupported
> wWidth 3840
> wHeight 2160
> dwMinBitRate 1327104000
> dwMaxBitRate 1327104000
> dwMaxVideoFrameBufferSize 16588800
> dwDefaultFrameInterval 333333
> bFrameIntervalType 6
> dwFrameInterval( 0) 333333
> dwFrameInterval( 1) 333666
> dwFrameInterval( 2) 400000
> dwFrameInterval( 3) 416666
> dwFrameInterval( 4) 500000
> dwFrameInterval( 5) 666666
> VideoStreaming Interface Descriptor:
> bLength 62
> bDescriptorType 36
> bDescriptorSubtype 7 (FRAME_MJPEG)
> bFrameIndex 3
> bmCapabilities 0x00
> Still image unsupported
> wWidth 1280
> wHeight 720
> dwMinBitRate 221184000
> dwMaxBitRate 884736000
> dwMaxVideoFrameBufferSize 1843200
> dwDefaultFrameInterval 333333
> bFrameIntervalType 9
> dwFrameInterval( 0) 166666
> dwFrameInterval( 1) 166833
> dwFrameInterval( 2) 200000
> dwFrameInterval( 3) 333333
> dwFrameInterval( 4) 333666
> dwFrameInterval( 5) 400000
> dwFrameInterval( 6) 416666
> dwFrameInterval( 7) 500000
> dwFrameInterval( 8) 666666
> VideoStreaming Interface Descriptor:
> bLength 50
> bDescriptorType 36
> bDescriptorSubtype 7 (FRAME_MJPEG)
> bFrameIndex 4
> bmCapabilities 0x00
> Still image unsupported
> wWidth 1280
> wHeight 960
> dwMinBitRate 294912000
> dwMaxBitRate 1179648000
> dwMaxVideoFrameBufferSize 2457600
> dwDefaultFrameInterval 333333
> bFrameIntervalType 6
> dwFrameInterval( 0) 166666
> dwFrameInterval( 1) 333333
> dwFrameInterval( 2) 400000
> dwFrameInterval( 3) 416666
> dwFrameInterval( 4) 500000
> dwFrameInterval( 5) 666666
> VideoStreaming Interface Descriptor:
> bLength 50
> bDescriptorType 36
> bDescriptorSubtype 7 (FRAME_MJPEG)
> bFrameIndex 5
> bmCapabilities 0x00
> Still image unsupported
> wWidth 1920
> wHeight 1440
> dwMinBitRate 663552000
> dwMaxBitRate 1327104000
> dwMaxVideoFrameBufferSize 5529600
> dwDefaultFrameInterval 333333
> bFrameIntervalType 6
> dwFrameInterval( 0) 166666
> dwFrameInterval( 1) 333333
> dwFrameInterval( 2) 400000
> dwFrameInterval( 3) 416666
> dwFrameInterval( 4) 500000
> dwFrameInterval( 5) 666666
> VideoStreaming Interface Descriptor:
> bLength 46
> bDescriptorType 36
> bDescriptorSubtype 7 (FRAME_MJPEG)
> bFrameIndex 6
> bmCapabilities 0x00
> Still image unsupported
> wWidth 4000
> wHeight 3000
> dwMinBitRate 1920000000
> dwMaxBitRate 1920000000
> dwMaxVideoFrameBufferSize 24000000
> dwDefaultFrameInterval 333333
> bFrameIntervalType 5
> dwFrameInterval( 0) 333333
> dwFrameInterval( 1) 400000
> dwFrameInterval( 2) 416666
> dwFrameInterval( 3) 500000
> dwFrameInterval( 4) 666666
> 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 7
> guidFormat {32595559-0000-0010-8000-00aa00389b71}
> bBitsPerPixel 16
> bDefaultFrameIndex 5
> 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 50
> bDescriptorType 36
> bDescriptorSubtype 5 (FRAME_UNCOMPRESSED)
> bFrameIndex 1
> bmCapabilities 0x00
> Still image unsupported
> wWidth 640
> wHeight 360
> dwMinBitRate 55296000
> dwMaxBitRate 221184000
> dwMaxVideoFrameBufferSize 460800
> dwDefaultFrameInterval 333333
> bFrameIntervalType 6
> dwFrameInterval( 0) 166666
> dwFrameInterval( 1) 333333
> dwFrameInterval( 2) 400000
> dwFrameInterval( 3) 416666
> dwFrameInterval( 4) 500000
> dwFrameInterval( 5) 666666
> VideoStreaming Interface Descriptor:
> bLength 50
> bDescriptorType 36
> bDescriptorSubtype 5 (FRAME_UNCOMPRESSED)
> bFrameIndex 2
> bmCapabilities 0x00
> Still image unsupported
> wWidth 640
> wHeight 480
> dwMinBitRate 73728000
> dwMaxBitRate 294912000
> dwMaxVideoFrameBufferSize 614400
> dwDefaultFrameInterval 333333
> bFrameIntervalType 6
> dwFrameInterval( 0) 166666
> dwFrameInterval( 1) 333333
> dwFrameInterval( 2) 400000
> dwFrameInterval( 3) 416666
> dwFrameInterval( 4) 500000
> dwFrameInterval( 5) 666666
> VideoStreaming Interface Descriptor:
> bLength 50
> bDescriptorType 36
> bDescriptorSubtype 5 (FRAME_UNCOMPRESSED)
> bFrameIndex 3
> bmCapabilities 0x00
> Still image unsupported
> wWidth 1280
> wHeight 720
> dwMinBitRate 221184000
> dwMaxBitRate 884736000
> dwMaxVideoFrameBufferSize 1843200
> dwDefaultFrameInterval 333333
> bFrameIntervalType 6
> dwFrameInterval( 0) 166666
> dwFrameInterval( 1) 333333
> dwFrameInterval( 2) 400000
> dwFrameInterval( 3) 416666
> dwFrameInterval( 4) 500000
> dwFrameInterval( 5) 666666
> VideoStreaming Interface Descriptor:
> bLength 50
> bDescriptorType 36
> bDescriptorSubtype 5 (FRAME_UNCOMPRESSED)
> bFrameIndex 4
> bmCapabilities 0x00
> Still image unsupported
> wWidth 1280
> wHeight 960
> dwMinBitRate 294912000
> dwMaxBitRate 1179648000
> dwMaxVideoFrameBufferSize 2457600
> dwDefaultFrameInterval 333333
> bFrameIntervalType 6
> dwFrameInterval( 0) 166666
> dwFrameInterval( 1) 333333
> dwFrameInterval( 2) 400000
> dwFrameInterval( 3) 416666
> dwFrameInterval( 4) 500000
> dwFrameInterval( 5) 666666
> VideoStreaming Interface Descriptor:
> bLength 46
> bDescriptorType 36
> bDescriptorSubtype 5 (FRAME_UNCOMPRESSED)
> bFrameIndex 5
> bmCapabilities 0x00
> Still image unsupported
> wWidth 1920
> wHeight 1080
> dwMinBitRate 497664000
> dwMaxBitRate 995328000
> dwMaxVideoFrameBufferSize 4147200
> dwDefaultFrameInterval 333333
> bFrameIntervalType 5
> dwFrameInterval( 0) 333333
> dwFrameInterval( 1) 400000
> dwFrameInterval( 2) 416666
> dwFrameInterval( 3) 500000
> dwFrameInterval( 4) 666666
> VideoStreaming Interface Descriptor:
> bLength 46
> bDescriptorType 36
> bDescriptorSubtype 5 (FRAME_UNCOMPRESSED)
> bFrameIndex 6
> bmCapabilities 0x00
> Still image unsupported
> wWidth 1920
> wHeight 1440
> dwMinBitRate 663552000
> dwMaxBitRate 1327104000
> dwMaxVideoFrameBufferSize 5529600
> dwDefaultFrameInterval 333333
> bFrameIntervalType 5
> dwFrameInterval( 0) 333333
> dwFrameInterval( 1) 400000
> dwFrameInterval( 2) 416666
> dwFrameInterval( 3) 500000
> dwFrameInterval( 4) 666666
> VideoStreaming Interface Descriptor:
> bLength 30
> bDescriptorType 36
> bDescriptorSubtype 5 (FRAME_UNCOMPRESSED)
> bFrameIndex 7
> bmCapabilities 0x00
> Still image unsupported
> wWidth 3840
> wHeight 2160
> dwMinBitRate 1990656000
> dwMaxBitRate 1990656000
> dwMaxVideoFrameBufferSize 16588800
> dwDefaultFrameInterval 666666
> bFrameIntervalType 1
> dwFrameInterval( 0) 666666
> 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 28
> bDescriptorType 36
> bDescriptorSubtype 16 (FORMAT_FRAME_BASED)
> bFormatIndex 3
> bNumFrameDescriptors 5
> guidFormat {34363248-0000-0010-8000-00aa00389b71}
> 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
> bVariableSize 1
> VideoStreaming Interface Descriptor:
> bLength 62
> bDescriptorType 36
> bDescriptorSubtype 17 (FRAME_FRAME_BASED)
> bFrameIndex 1
> bmCapabilities 0x00
> Still image unsupported
> wWidth 1920
> wHeight 1080
> dwMinBitRate 497664000
> dwMaxBitRate 1990656000
> dwDefaultFrameInterval 333333
> bFrameIntervalType 9
> dwBytesPerLine 0
> dwFrameInterval( 0) 166666
> dwFrameInterval( 1) 166833
> dwFrameInterval( 2) 200000
> dwFrameInterval( 3) 333333
> dwFrameInterval( 4) 333666
> dwFrameInterval( 5) 400000
> dwFrameInterval( 6) 416666
> dwFrameInterval( 7) 500000
> dwFrameInterval( 8) 666666
> VideoStreaming Interface Descriptor:
> bLength 50
> bDescriptorType 36
> bDescriptorSubtype 17 (FRAME_FRAME_BASED)
> bFrameIndex 2
> bmCapabilities 0x00
> Still image unsupported
> wWidth 3840
> wHeight 2160
> dwMinBitRate 1327104000
> dwMaxBitRate 1327104000
> dwDefaultFrameInterval 333333
> bFrameIntervalType 6
> dwBytesPerLine 0
> dwFrameInterval( 0) 333333
> dwFrameInterval( 1) 333666
> dwFrameInterval( 2) 400000
> dwFrameInterval( 3) 416666
> dwFrameInterval( 4) 500000
> dwFrameInterval( 5) 666666
> VideoStreaming Interface Descriptor:
> bLength 62
> bDescriptorType 36
> bDescriptorSubtype 17 (FRAME_FRAME_BASED)
> bFrameIndex 4
> bmCapabilities 0x00
> Still image unsupported
> wWidth 1280
> wHeight 720
> dwMinBitRate 221184000
> dwMaxBitRate 884736000
> dwDefaultFrameInterval 333333
> bFrameIntervalType 9
> dwBytesPerLine 0
> dwFrameInterval( 0) 166666
> dwFrameInterval( 1) 166833
> dwFrameInterval( 2) 200000
> dwFrameInterval( 3) 333333
> dwFrameInterval( 4) 333666
> dwFrameInterval( 5) 400000
> dwFrameInterval( 6) 416666
> dwFrameInterval( 7) 500000
> dwFrameInterval( 8) 666666
> VideoStreaming Interface Descriptor:
> bLength 50
> bDescriptorType 36
> bDescriptorSubtype 17 (FRAME_FRAME_BASED)
> bFrameIndex 5
> bmCapabilities 0x00
> Still image unsupported
> wWidth 1280
> wHeight 960
> dwMinBitRate 294912000
> dwMaxBitRate 1179648000
> dwDefaultFrameInterval 333333
> bFrameIntervalType 6
> dwBytesPerLine 0
> dwFrameInterval( 0) 166666
> dwFrameInterval( 1) 333333
> dwFrameInterval( 2) 400000
> dwFrameInterval( 3) 416666
> dwFrameInterval( 4) 500000
> dwFrameInterval( 5) 666666
> VideoStreaming Interface Descriptor:
> bLength 50
> bDescriptorType 36
> bDescriptorSubtype 17 (FRAME_FRAME_BASED)
> bFrameIndex 6
> bmCapabilities 0x00
> Still image unsupported
> wWidth 1920
> wHeight 1440
> dwMinBitRate 663552000
> dwMaxBitRate 1327104000
> dwDefaultFrameInterval 333333
> bFrameIntervalType 6
> dwBytesPerLine 0
> dwFrameInterval( 0) 166666
> dwFrameInterval( 1) 333333
> dwFrameInterval( 2) 400000
> dwFrameInterval( 3) 416666
> dwFrameInterval( 4) 500000
> dwFrameInterval( 5) 666666
> 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))
> Endpoint Descriptor:
> bLength 7
> bDescriptorType 5
> bEndpointAddress 0x81 EP 1 IN
> bmAttributes 2
> Transfer Type Bulk
> Synch Type None
> Usage Type Data
> wMaxPacketSize 0x0400 1x 1024 bytes
> bInterval 0
> bMaxBurst 13
> Interface Association:
> bLength 8
> bDescriptorType 11
> bFirstInterface 2
> bInterfaceCount 2
> bFunctionClass 1 Audio
> bFunctionSubClass 0 [unknown]
> bFunctionProtocol 0
> iFunction 8 OBSBOT Tiny2 Audio
> Interface Descriptor:
> bLength 9
> bDescriptorType 4
> bInterfaceNumber 2
> bAlternateSetting 0
> bNumEndpoints 0
> bInterfaceClass 1 Audio
> bInterfaceSubClass 1 Control Device
> bInterfaceProtocol 0
> iInterface 8 OBSBOT Tiny2 Audio
> AudioControl Interface Descriptor:
> bLength 9
> bDescriptorType 36
> bDescriptorSubtype 1 (HEADER)
> bcdADC 1.00
> wTotalLength 0x0027
> bInCollection 1
> baInterfaceNr(0) 3
> AudioControl Interface Descriptor:
> bLength 12
> bDescriptorType 36
> bDescriptorSubtype 2 (INPUT_TERMINAL)
> bTerminalID 3
> wTerminalType 0x0201 Microphone
> bAssocTerminal 0
> bNrChannels 2
> wChannelConfig 0x0003
> Left Front (L)
> Right Front (R)
> iChannelNames 13 Capture Channels
> iTerminal 12 OBSBOT Tiny2 Microphone
> AudioControl Interface Descriptor:
> bLength 9
> bDescriptorType 36
> bDescriptorSubtype 3 (OUTPUT_TERMINAL)
> bTerminalID 4
> wTerminalType 0x0101 USB Streaming
> bAssocTerminal 0
> bSourceID 5
> iTerminal 14 Capture Output terminal
> AudioControl Interface Descriptor:
> bLength 9
> bDescriptorType 36
> bDescriptorSubtype 6 (FEATURE_UNIT)
> bUnitID 5
> bSourceID 3
> bControlSize 2
> bmaControls(0) 0x0003
> Mute Control
> Volume Control
> iFeature 0
> Interface Descriptor:
> bLength 9
> bDescriptorType 4
> bInterfaceNumber 3
> bAlternateSetting 0
> bNumEndpoints 0
> bInterfaceClass 1 Audio
> bInterfaceSubClass 2 Streaming
> bInterfaceProtocol 0
> iInterface 17 OBSBOT Tiny2 Microphone
> Interface Descriptor:
> bLength 9
> bDescriptorType 4
> bInterfaceNumber 3
> bAlternateSetting 1
> bNumEndpoints 1
> bInterfaceClass 1 Audio
> bInterfaceSubClass 2 Streaming
> bInterfaceProtocol 0
> iInterface 18 Capture Active
> 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 2
> bSubframeSize 2
> bBitResolution 16
> bSamFreqType 1 Discrete
> tSamFreq[ 0] 48000
> Endpoint Descriptor:
> bLength 9
> bDescriptorType 5
> bEndpointAddress 0x82 EP 2 IN
> bmAttributes 5
> Transfer Type Isochronous
> Synch Type Asynchronous
> Usage Type Data
> wMaxPacketSize 0x00c0 1x 192 bytes
> bInterval 4
> bRefresh 0
> bSynchAddress 0
> bMaxBurst 0
> AudioStreaming Endpoint Descriptor:
> bLength 7
> bDescriptorType 37
> bDescriptorSubtype 1 (EP_GENERAL)
> bmAttributes 0x01
> Sampling Frequency
> bLockDelayUnits 0 Undefined
> wLockDelay 0x0000
> Binary Object Store Descriptor:
> bLength 5
> bDescriptorType 15
> wTotalLength 0x0016
> bNumDeviceCaps 2
> USB 2.0 Extension Device Capability:
> bLength 7
> bDescriptorType 16
> bDevCapabilityType 2
> bmAttributes 0x00000006
> BESL Link Power Management (LPM) Supported
> SuperSpeed USB Device Capability:
> bLength 10
> bDescriptorType 16
> bDevCapabilityType 3
> bmAttributes 0x00
> wSpeedsSupported 0x000f
> Device can operate at Low Speed (1Mbps)
> Device can operate at Full Speed (12Mbps)
> Device can operate at High Speed (480Mbps)
> Device can operate at SuperSpeed (5Gbps)
> bFunctionalitySupport 1
> Lowest fully-functional device speed is Full Speed (12Mbps)
> bU1DevExitLat 1 micro seconds
> bU2DevExitLat 500 micro seconds
> Device Status: 0x0001
> Self Powered
>
> Signed-off-by: John Bauer <[email protected]>
> Signed-off-by: Gergo Koteles <[email protected]>
> Reviewed-by: Ricardo Ribalda <[email protected]>
> Reviewed-by: Hans de Goede <[email protected]>
> Signed-off-by: Hans de Goede <[email protected]>
> Signed-off-by: Hans Verkuil <[email protected]>
Patch committed.
Thanks,
Hans Verkuil
drivers/media/usb/uvc/uvc_ctrl.c | 62 +++++++++++++++++++++++++++++++++-------
1 file changed, 51 insertions(+), 11 deletions(-)
---
diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index ec5aaeb99928..f0f6f8454d9c 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -483,6 +483,7 @@ static int uvc_ctrl_get_zoom(struct uvc_control_mapping
*mapping, u8 query,
return 0;
case UVC_GET_MIN:
+ /* Not used, we use -UVC_GET_MAX */
case UVC_GET_MAX:
case UVC_GET_RES:
case UVC_GET_DEF:
@@ -526,8 +527,7 @@ static int uvc_ctrl_get_rel_speed(struct
uvc_control_mapping *mapping,
*out = (sign == 0) ? 0 : (sign > 0 ? value : -value);
return 0;
case UVC_GET_MIN:
- *out = -value;
- return 0;
+ /* Not used, we use -UVC_GET_MAX */
case UVC_GET_MAX:
case UVC_GET_RES:
case UVC_GET_DEF:
@@ -1527,6 +1527,17 @@ static u32 uvc_get_ctrl_bitmap(struct uvc_control *ctrl,
return ~0;
}
+static bool uvc_ctrl_is_relative_ptz(__u32 ctrl_id)
+{
+ switch (ctrl_id) {
+ case V4L2_CID_ZOOM_CONTINUOUS:
+ case V4L2_CID_PAN_SPEED:
+ case V4L2_CID_TILT_SPEED:
+ return true;
+ }
+ return false;
+}
+
/*
* Maximum retry count to avoid spurious errors with controls. Increasing this
* value does no seem to produce better results in the tested hardware.
@@ -1586,18 +1597,32 @@ static int __uvc_queryctrl_boundaries(struct
uvc_video_chain *chain,
break;
}
- if (ctrl->info.flags & UVC_CTRL_FLAG_GET_MIN)
- v4l2_ctrl->minimum = uvc_mapping_get_s32(mapping, UVC_GET_MIN,
- uvc_ctrl_data(ctrl, UVC_CTRL_DATA_MIN));
- else
- v4l2_ctrl->minimum = 0;
-
if (ctrl->info.flags & UVC_CTRL_FLAG_GET_MAX)
v4l2_ctrl->maximum = uvc_mapping_get_s32(mapping, UVC_GET_MAX,
uvc_ctrl_data(ctrl, UVC_CTRL_DATA_MAX));
else
v4l2_ctrl->maximum = 0;
+ if (ctrl->info.flags & UVC_CTRL_FLAG_GET_MIN) {
+ /*
+ * For relative PTZ controls, UVC_GET_MIN for
+ * b(Pan|Tilt|Zoom)Speed returns the minimum speed of the
+ * movement in direction specified in the sign field.
+ * See in USB Device Class Definition for Video Devices:
+ * 4.2.2.1.13 Zoom (Relative) Control
+ * 4.2.2.1.15 PanTilt (Relative) Control
+ *
+ * For minimum value, use maximum speed but in negative
direction.
+ */
+ if (uvc_ctrl_is_relative_ptz(v4l2_ctrl->id))
+ v4l2_ctrl->minimum = -v4l2_ctrl->maximum;
+ else
+ v4l2_ctrl->minimum = uvc_mapping_get_s32(mapping,
+ UVC_GET_MIN, uvc_ctrl_data(ctrl,
UVC_CTRL_DATA_MIN));
+ } else {
+ v4l2_ctrl->minimum = 0;
+ }
+
if (ctrl->info.flags & UVC_CTRL_FLAG_GET_RES)
v4l2_ctrl->step = uvc_mapping_get_s32(mapping, UVC_GET_RES,
uvc_ctrl_data(ctrl, UVC_CTRL_DATA_RES));
@@ -2459,6 +2484,7 @@ int uvc_ctrl_get(struct uvc_video_chain *chain, u32 which,
static int uvc_ctrl_clamp(struct uvc_video_chain *chain,
struct uvc_control *ctrl,
+ u32 v4l2_id,
struct uvc_control_mapping *mapping,
s32 *value_in_out)
{
@@ -2476,10 +2502,24 @@ static int uvc_ctrl_clamp(struct uvc_video_chain *chain,
return ret;
}
- min = uvc_mapping_get_s32(mapping, UVC_GET_MIN,
- uvc_ctrl_data(ctrl,
UVC_CTRL_DATA_MIN));
max = uvc_mapping_get_s32(mapping, UVC_GET_MAX,
uvc_ctrl_data(ctrl,
UVC_CTRL_DATA_MAX));
+ /*
+ * For relative PTZ controls, UVC_GET_MIN for
+ * b(Pan|Tilt|Zoom)Speed returns the minimum speed of the
+ * movement in direction specified in the sign field.
+ * See in USB Device Class Definition for Video Devices:
+ * 4.2.2.1.13 Zoom (Relative) Control
+ * 4.2.2.1.15 PanTilt (Relative) Control
+ *
+ * For minimum value, use maximum speed but in negative
direction.
+ */
+ if (uvc_ctrl_is_relative_ptz(v4l2_id))
+ min = -max;
+ else
+ min = uvc_mapping_get_s32(mapping, UVC_GET_MIN,
+ uvc_ctrl_data(ctrl, UVC_CTRL_DATA_MIN));
+
step = uvc_mapping_get_s32(mapping, UVC_GET_RES,
uvc_ctrl_data(ctrl,
UVC_CTRL_DATA_RES));
if (step == 0)
@@ -2593,7 +2633,7 @@ int uvc_ctrl_set(struct uvc_fh *handle, struct
v4l2_ext_control *xctrl)
if (!(ctrl->info.flags & UVC_CTRL_FLAG_SET_CUR))
return -EACCES;
- ret = uvc_ctrl_clamp(chain, ctrl, mapping, &xctrl->value);
+ ret = uvc_ctrl_clamp(chain, ctrl, xctrl->id, mapping, &xctrl->value);
if (ret)
return ret;
/*
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