Hi Laurent,
Thank you for the reply. The webcam is linux based and I am using the
UVC gadget driver of linux kernel 2.6.10.
In this kernel I don't see any example doing UVC bulk transfer. It is
working perfectly with ISOC.
Can you please let me know, if there is any example code that does UVC bulk
transfer ? I couldn't find it any.
The uvc specification is not clear enough to distinguish ISOC and BULK
transfer atleast from my understanding.
While doing ISOC transfer, we have an alternate Interface Setting, when we
get a SET_INTERFACE we start transferring the UVC header first alone to
start
the transfer. There after each IN token from host will carry the frames if
any, otherwise header alone goes.
In case of BULK, with alternate settings, the host machine hangs.
SET_INTERFACE (alternateSetting set 1), Why is it like that?
So I removed alternate settings and till enumeration it is proper. Then
After I get VS_PROBE_COMMIT from the host, I start transferring exactly same
like ISOC, but
I don't see any video on the host and no more proceedings from here. The
data is not going from the FIFO, hence I am not getting any more TX
interrupt from my device.
I am attaching my devices descriptor as well as host side logs. Please find
the attachment. Please let me know, is there any link talk about BULK
transfer or example.
Thanks & Regards,
Ramesh.
On Wed, Nov 11, 2009 at 5:13 AM, Laurent Pinchart <
[email protected]> wrote:
> Hi Ramesh,
>
> On Tuesday 10 November 2009 17:03:50 Ramesh Rajagopal wrote:
> > Hi,
> > I am trying to implement UVC bulk tranfer for my webcam. I am getting
> some
> > difficulties.
> > If anybody has already tried, Can you please send me the enumeration
> > details.?
>
> Are you developing a webcam ? Is it Linux-based ? If so, are you using the
> UVC
> gadget driver I've posted to the linux-usb mailing list some time ago ?
>
> You will find sample USB descriptors for a bulk device attached to this e-
> mail.
>
> > Does this same as ISOC transfer or is it different, If so, Please give me
> > those details.
>
> What about reading the UVC spec ?
>
> --
> Regards,
>
> Laurent Pinchart
>
Bus 002 Device 044: ID 1984:0001
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 239 Miscellaneous Device
bDeviceSubClass 2 ?
bDeviceProtocol 1 Interface Association
bMaxPacketSize0 64
idVendor 0x1984
idProduct 0x0001
bcdDevice 2.16
iManufacturer 1 Bison
iProduct 2 Bison Video
iSerial 3 A1AP20B00112
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 636
bNumInterfaces 2
bConfigurationValue 1
iConfiguration 2 Bison Video
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 5 Bison Video
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 14 Video
bInterfaceSubClass 1 Video Control
bInterfaceProtocol 0
iInterface 5 Bison Video
VideoControl Interface Descriptor:
bLength 13
bDescriptorType 36
bDescriptorSubtype 1 (HEADER)
bcdUVC 1.00
wTotalLength 39
dwClockFrequency 24.000000MHz
bInCollection 1
baInterfaceNr( 0) 1
VideoControl Interface Descriptor:
bLength 17
bDescriptorType 36
bDescriptorSubtype 2 (INPUT_TERMINAL)
bTerminalID 3
wTerminalType 0x0201 Camera Sensor
bAssocTerminal 0
iTerminal 5 Bison Video
wObjectiveFocalLengthMin 0
wObjectiveFocalLengthMax 0
wOcularFocalLength 0
bControlSize 2
bmControls 0x00000000
VideoControl Interface Descriptor:
bLength 9
bDescriptorType 36
bDescriptorSubtype 3 (OUTPUT_TERMINAL)
bTerminalID 4
wTerminalType 0x0101 USB Streaming
bAssocTerminal 0
bSourceID 3
iTerminal 5 Bison Video
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 14 Video
bInterfaceSubClass 2 Video Streaming
bInterfaceProtocol 0
iInterface 7 Bison Video
VideoStreaming Interface Descriptor:
bLength 15
bDescriptorType 36
bDescriptorSubtype 1 (INPUT_HEADER)
bNumFormats 2
wTotalLength 555
bEndPointAddress 131
bmInfo 0
bTerminalLink 4
bStillCaptureMethod 0
bTriggerSupport 0
bTriggerUsage 0
bControlSize 1
bmaControls( 0) 11
bmaControls( 1) 11
VideoStreaming Interface Descriptor:
bLength 11
bDescriptorType 36
bDescriptorSubtype 6 (FORMAT_MJPEG)
bFormatIndex 1
bNumFrameDescriptors 8
bFlags 1
Fixed-size samples: Yes
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 38
bDescriptorType 36
bDescriptorSubtype 7 (FRAME_MJPEG)
bFrameIndex 1
bmCapabilities 0x00
Still image unsupported
wWidth 640
wHeight 480
dwMinBitRate 65000000
dwMaxBitRate 65000000
dwMaxVideoFrameBufferSize 307200
dwDefaultFrameInterval 333333
bFrameIntervalType 3
dwFrameInterval( 0) 333333
dwFrameInterval( 1) 400000
dwFrameInterval( 2) 666666
VideoStreaming Interface Descriptor:
bLength 38
bDescriptorType 36
bDescriptorSubtype 7 (FRAME_MJPEG)
bFrameIndex 2
bmCapabilities 0x00
Still image unsupported
wWidth 160
wHeight 120
dwMinBitRate 65000000
dwMaxBitRate 65000000
dwMaxVideoFrameBufferSize 307200
dwDefaultFrameInterval 333333
bFrameIntervalType 3
dwFrameInterval( 0) 333333
dwFrameInterval( 1) 400000
dwFrameInterval( 2) 666666
VideoStreaming Interface Descriptor:
bLength 38
bDescriptorType 36
bDescriptorSubtype 7 (FRAME_MJPEG)
bFrameIndex 3
bmCapabilities 0x00
Still image unsupported
wWidth 352
wHeight 288
dwMinBitRate 65000000
dwMaxBitRate 65000000
dwMaxVideoFrameBufferSize 307200
dwDefaultFrameInterval 333333
bFrameIntervalType 3
dwFrameInterval( 0) 333333
dwFrameInterval( 1) 400000
dwFrameInterval( 2) 666666
VideoStreaming Interface Descriptor:
bLength 38
bDescriptorType 36
bDescriptorSubtype 7 (FRAME_MJPEG)
bFrameIndex 4
bmCapabilities 0x00
Still image unsupported
wWidth 768
wHeight 448
dwMinBitRate 65000000
dwMaxBitRate 65000000
dwMaxVideoFrameBufferSize 307200
dwDefaultFrameInterval 333333
bFrameIntervalType 3
dwFrameInterval( 0) 333333
dwFrameInterval( 1) 400000
dwFrameInterval( 2) 666666
VideoStreaming Interface Descriptor:
bLength 38
bDescriptorType 36
bDescriptorSubtype 7 (FRAME_MJPEG)
bFrameIndex 5
bmCapabilities 0x00
Still image unsupported
wWidth 512
wHeight 288
dwMinBitRate 65000000
dwMaxBitRate 65000000
dwMaxVideoFrameBufferSize 307200
dwDefaultFrameInterval 333333
bFrameIntervalType 3
dwFrameInterval( 0) 333333
dwFrameInterval( 1) 400000
dwFrameInterval( 2) 666666
VideoStreaming Interface Descriptor:
bLength 38
bDescriptorType 36
bDescriptorSubtype 7 (FRAME_MJPEG)
bFrameIndex 6
bmCapabilities 0x00
Still image unsupported
wWidth 320
wHeight 240
dwMinBitRate 65000000
dwMaxBitRate 65000000
dwMaxVideoFrameBufferSize 307200
dwDefaultFrameInterval 333333
bFrameIntervalType 3
dwFrameInterval( 0) 333333
dwFrameInterval( 1) 400000
dwFrameInterval( 2) 666666
VideoStreaming Interface Descriptor:
bLength 38
bDescriptorType 36
bDescriptorSubtype 7 (FRAME_MJPEG)
bFrameIndex 7
bmCapabilities 0x00
Still image unsupported
wWidth 1024
wHeight 576
dwMinBitRate 65000000
dwMaxBitRate 65000000
dwMaxVideoFrameBufferSize 307200
dwDefaultFrameInterval 333333
bFrameIntervalType 3
dwFrameInterval( 0) 333333
dwFrameInterval( 1) 400000
dwFrameInterval( 2) 666666
VideoStreaming Interface Descriptor:
bLength 38
bDescriptorType 36
bDescriptorSubtype 7 (FRAME_MJPEG)
bFrameIndex 8
bmCapabilities 0x00
Still image unsupported
wWidth 1280
wHeight 720
dwMinBitRate 65000000
dwMaxBitRate 65000000
dwMaxVideoFrameBufferSize 307200
dwDefaultFrameInterval 333333
bFrameIntervalType 3
dwFrameInterval( 0) 333333
dwFrameInterval( 1) 400000
dwFrameInterval( 2) 666666
VideoStreaming Interface Descriptor:
bLength 6
bDescriptorType 36
bDescriptorSubtype 13 (COLORFORMAT)
bColorPrimaries 0 (Unspecified)
bTransferCharacteristics 0 (Unspecified)
bMatrixCoefficients 0 (Unspecified)
VideoStreaming Interface Descriptor:
bLength 27
bDescriptorType 36
bDescriptorSubtype 4 (FORMAT_UNCOMPRESSED)
bFormatIndex 2
bNumFrameDescriptors 5
guidFormat
{59555932-0000-1000-8000-00aa00389b71}
bBitsPerPixel 16
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 38
bDescriptorType 36
bDescriptorSubtype 5 (FRAME_UNCOMPRESSED)
bFrameIndex 1
bmCapabilities 0x00
Still image unsupported
wWidth 352
wHeight 288
dwMinBitRate 48660480
dwMaxBitRate 48660480
dwMaxVideoFrameBufferSize 202752
dwDefaultFrameInterval 333333
bFrameIntervalType 3
dwFrameInterval( 0) 333333
dwFrameInterval( 1) 400000
dwFrameInterval( 2) 666666
VideoStreaming Interface Descriptor:
bLength 38
bDescriptorType 36
bDescriptorSubtype 5 (FRAME_UNCOMPRESSED)
bFrameIndex 2
bmCapabilities 0x00
Still image unsupported
wWidth 160
wHeight 120
dwMinBitRate 48660480
dwMaxBitRate 48660480
dwMaxVideoFrameBufferSize 38400
dwDefaultFrameInterval 333333
bFrameIntervalType 3
dwFrameInterval( 0) 333333
dwFrameInterval( 1) 400000
dwFrameInterval( 2) 666666
VideoStreaming Interface Descriptor:
bLength 34
bDescriptorType 36
bDescriptorSubtype 5 (FRAME_UNCOMPRESSED)
bFrameIndex 3
bmCapabilities 0x00
Still image unsupported
wWidth 512
wHeight 288
dwMinBitRate 48660480
dwMaxBitRate 48660480
dwMaxVideoFrameBufferSize 294912
dwDefaultFrameInterval 400000
bFrameIntervalType 2
dwFrameInterval( 0) 400000
dwFrameInterval( 1) 666666
VideoStreaming Interface Descriptor:
bLength 38
bDescriptorType 36
bDescriptorSubtype 5 (FRAME_UNCOMPRESSED)
bFrameIndex 4
bmCapabilities 0x00
Still image unsupported
wWidth 320
wHeight 180
dwMinBitRate 48660480
dwMaxBitRate 48660480
dwMaxVideoFrameBufferSize 115200
dwDefaultFrameInterval 333333
bFrameIntervalType 3
dwFrameInterval( 0) 333333
dwFrameInterval( 1) 400000
dwFrameInterval( 2) 666666
VideoStreaming Interface Descriptor:
bLength 38
bDescriptorType 36
bDescriptorSubtype 5 (FRAME_UNCOMPRESSED)
bFrameIndex 5
bmCapabilities 0x00
Still image unsupported
wWidth 320
wHeight 240
dwMinBitRate 48660480
dwMaxBitRate 48660480
dwMaxVideoFrameBufferSize 153600
dwDefaultFrameInterval 333333
bFrameIntervalType 3
dwFrameInterval( 0) 333333
dwFrameInterval( 1) 400000
dwFrameInterval( 2) 666666
VideoStreaming Interface Descriptor:
bLength 6
bDescriptorType 36
bDescriptorSubtype 13 (COLORFORMAT)
bColorPrimaries 0 (Unspecified)
bTransferCharacteristics 0 (Unspecified)
bMatrixCoefficients 0 (Unspecified)
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
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
Device Status: 0x0000
(Bus Powered)
Script started on Wednesday 11 November 2009 04:34:48 PM IST
<6>[24280.548538] usb 2-3: new high speed USB device using ehci_hcd and address
44
<6>[24280.842397] usb 2-3: configuration #1 chosen from 1 choice
<7>[24280.864670] uvcvideo: Probing generic UVC device 3
<7>[24280.864753] uvcvideo: Found format MJPEG.
<7>[24280.864772] uvcvideo: - 640x480 (30.0 fps)
<7>[24280.864787] uvcvideo: - 160x120 (30.0 fps)
<7>[24280.864800] uvcvideo: - 352x288 (30.0 fps)
<7>[24280.864813] uvcvideo: - 768x448 (30.0 fps)
<7>[24280.864826] uvcvideo: - 512x288 (30.0 fps)
<7>[24280.864838] uvcvideo: - 320x240 (30.0 fps)
<7>[24280.864852] uvcvideo: - 1024x576 (30.0 fps)
<7>[24280.864865] uvcvideo: - 1280x720 (30.0 fps)
<7>[24280.864880] uvcvideo: Found format YUV 4:2:2 (YUYV).
<7>[24280.864894] uvcvideo: - 352x288 (30.0 fps)
<7>[24280.864908] uvcvideo: - 160x120 (30.0 fps)
<7>[24280.864920] uvcvideo: - 512x288 (25.0 fps)
<7>[24280.864933] uvcvideo: - 320x180 (30.0 fps)
<7>[24280.864946] uvcvideo: - 320x240 (30.0 fps)
<6>[24280.895911] uvcvideo: Found UVC 1.00 device Bison Video (1984:0001)
<7>[24280.895933] uvcvideo: Scanning UVC chain: OT 4 <- IT 3
<6>[24280.895941] uvcvideo: Found a valid video chain (3 -> 4).
<7>[24280.915635] uvcvideo: UVC device initialized.
<7>[24280.959475] uvcvideo: uvc_v4l2_open
<7>[24280.959496] uvcvideo: uvc_v4l2_ioctl
<4>[24280.959504] VIDIOC_QUERYCAP<7>uvcvideo: uvc_v4l2_release
<7>[24392.704013] uvcvideo: uvc_v4l2_open
<7>[24392.704013] uvcvideo: uvc_v4l2_ioctl
<4>[24392.704013] VIDIOC_QUERYCAP<7>uvcvideo: uvc_v4l2_ioctl
<4>[24392.704013] VIDIOC_ENUM_FMT<7>uvcvideo: uvc_v4l2_ioctl
<4>[24392.704013] VIDIOC_ENUM_FMT<7>uvcvideo: uvc_v4l2_ioctl
<4>[24392.704013] VIDIOC_ENUM_FMT<7>uvcvideo: uvc_v4l2_ioctl
<4>[24392.704013] VIDIOC_S_FMT<7>uvcvideo: Trying format 0x47504a4d (MJPG):
640x480.
<7>[24392.704013] uvcvideo: Using default frame interval 33333.3 us (30.0 fps).
<7>[24392.776509] uvcvideo: uvc_v4l2_ioctl
<4>[24392.776509] VIDIOC_S_PARM<7>uvcvideo: Setting frame interval to 1/30
(333333).
<7>[24392.840506] uvcvideo: uvc_v4l2_ioctl
<4>[24392.840506] VIDIOC_G_PARM<7>uvcvideo: uvc_v4l2_ioctl
<4>[24392.840736] VIDIOC_REQBUFS<7>uvcvideo: uvc_v4l2_ioctl
<4>[24392.841355] VIDIOC_QUERYBUF<7>uvcvideo: uvc_v4l2_mmap
<7>[24392.841622] uvcvideo: uvc_v4l2_ioctl
<4>[24392.841634] VIDIOC_QUERYBUF<7>uvcvideo: uvc_v4l2_mmap
<7>[24392.841828] uvcvideo: uvc_v4l2_ioctl
<4>[24392.841840] VIDIOC_QUERYBUF<7>uvcvideo: uvc_v4l2_mmap
<7>[24392.842101] uvcvideo: uvc_v4l2_ioctl
<4>[24392.842112] VIDIOC_QUERYBUF<7>uvcvideo: uvc_v4l2_mmap
<7>[24392.842305] uvcvideo: uvc_v4l2_ioctl
<4>[24392.842317] VIDIOC_QBUF<7>uvcvideo: Queuing buffer 0.
<7>[24392.842340] uvcvideo: uvc_v4l2_ioctl
<4>[24392.842351] VIDIOC_QBUF<7>uvcvideo: Queuing buffer 1.
<7>[24392.842370] uvcvideo: uvc_v4l2_ioctl
<4>[24392.842380] VIDIOC_QBUF<7>uvcvideo: Queuing buffer 2.
<7>[24392.842399] uvcvideo: uvc_v4l2_ioctl
<4>[24392.842409] VIDIOC_QBUF<7>uvcvideo: Queuing buffer 3.
<7>[24393.085678] uvcvideo: uvc_v4l2_ioctl
<4>[24393.085693] VIDIOC_STREAMON<7>uvcvideo: uvc_v4l2_ioctl
<4>[24393.105306] VIDIOC_DQBUF^C
Script done on Wednesday 11 November 2009 04:37:43 PM IST
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