linux-kernel - Re: uvcvideo: Unknown video format,00000032-0002-0010-8000-00aa00389b71

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Date:   Wed, 21 Mar 2018 15:48:04 -0400
From:   Nicolas Dufresne <nicolas@...fresne.ca>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     Paul Menzel <pmenzel+linux-media@...gen.mpg.de>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        it+linux-media@...gen.mpg.de
Subject: Re: uvcvideo: Unknown video
 format,00000032-0002-0010-8000-00aa00389b71

Le mercredi 21 mars 2018 à 10:55 +0200, Laurent Pinchart a écrit :
> Hi Nicolas,
> 
> On Wednesday, 21 March 2018 05:38:59 EET Nicolas Dufresne wrote:
> > Le mardi 20 mars 2018 à 20:04 +0200, Laurent Pinchart a écrit :
> > > On Tuesday, 20 March 2018 19:45:51 EET Nicolas Dufresne wrote:
> > > > Le mardi 20 mars 2018 à 13:20 +0100, Paul Menzel a écrit :
> > > > > Dear Linux folks,
> > > > > 
> > > > > 
> > > > > On the Dell XPS 13 9370, Linux 4.16-rc6 outputs the messages below.
> > > > > 
> > > > > ```
> > > > > [    2.338094] calling  uvc_init+0x0/0x1000 [uvcvideo] @ 295
> > > > > [    2.338569] calling  iTCO_wdt_init_module+0x0/0x1000 [iTCO_wdt] @
> > > > > 280
> > > > > [    2.338570] iTCO_wdt: Intel TCO WatchDog Timer Driver v1.11
> > > > > [    2.338713] iTCO_wdt: Found a Intel PCH TCO device (Version=4,
> > > > > TCOBASE=0x0400)
> > > > > [    2.338755] uvcvideo: Found UVC 1.00 device Integrated_Webcam_HD
> > > > > (0bda:58f4)
> > > > > [    2.338827] iTCO_wdt: initialized. heartbeat=30 sec (nowayout=0)
> > > > > [    2.338851] initcall iTCO_wdt_init_module+0x0/0x1000 [iTCO_wdt]
> > > > > returned 0 after 271 usecs
> > > > > [    2.340669] uvcvideo 1-5:1.0: Entity type for entity Extension 4
> > > > > was
> > > > > not initialized!
> > > > > [    2.340670] uvcvideo 1-5:1.0: Entity type for entity Extension 7
> > > > > was
> > > > > not initialized!
> > > > > [    2.340672] uvcvideo 1-5:1.0: Entity type for entity Processing 2
> > > > > was
> > > > > not initialized!
> > > > > [    2.340673] uvcvideo 1-5:1.0: Entity type for entity Camera 1 was
> > > > > not
> > > > > initialized!
> > > > > [    2.340736] input: Integrated_Webcam_HD: Integrate as
> > > > > /devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5:1.0/input/input9
> > > > > [    2.341447] uvcvideo: Unknown video format
> > > > > 00000032-0002-0010-8000-00aa00389b71
> > > > 
> > > > While the 0002 is suspicious, this is pretty close to a color format.
> > > > I've recently come across of similar format using D3DFORMAT instead of
> > > > GUID. According to the vendor*, this camera module includes an infrared
> > > > camera (340x340), so I suspect this is to specify the format it
> > > > outputs. A good guess to start with would be that this is
> > > > D3DFMT_X8L8V8U8 (0x32).
> > > 
> > > Isn't 0x32 D3DFMT_L8, not D3DFMT_X8L8V8U8 ?
> > 
> > You are right, sorry about that, I totally miss-translate. It felt
> > weird. This is much more likely yes. So maybe it's the same mapping
> > (but with the -00002- instead) as what I added for the HoloLense
> > Camera.
> > 
> > > > To test it, you could map this
> > > > V4L2_PIX_FMT_YUV32/xRGB and see if the driver is happy with the buffer
> > > > size.
> > > 
> > > VideoStreaming Interface Descriptor:
> > >         bLength                            30
> > >         bDescriptorType                    36
> > >         bDescriptorSubtype                  5 (FRAME_UNCOMPRESSED)
> > >         bFrameIndex                         1
> > >         bmCapabilities                   0x00
> > >         
> > >           Still image unsupported
> > >         
> > >         wWidth                            340
> > >         wHeight                           340
> > >         dwMinBitRate                 55488000
> > >         dwMaxBitRate                 55488000
> > >         dwMaxVideoFrameBufferSize      115600
> > >         dwDefaultFrameInterval         166666
> > >         bFrameIntervalType                  1
> > >         dwFrameInterval( 0)            166666
> > > 
> > > 340*340 is 115600, so this should be a 8-bit format.
> > 
> > Indeed, that matches.
> > 
> > > > Then render it to make sure it looks some image of some sort. A
> > > > new format will need to be defined as this format is in the wrong
> > > > order, and is ambiguous (it may mean AYUV or xYUV). I'm not sure if we
> > > > need specific formats to differentiate infrared data from YUV images,
> > > > need to be discussed.
> > > 
> > > If the format is indeed D3DFMT_L8, it should map to V4L2_PIX_FMT_GREY
> > > (8-bit luminance). I suspect the camera transmits a depth map though.
> > 
> > I wonder if we should think of a way to tell userspace this is fnfrared
> > data rather then black and white ?
> 
> I think we need such a mechanism, yes. Would you like to propose one ? :-)

Ok, meanwhile I've looked over how this camera was used. It seems
that's it's combined with a IR light in order to create a near field
depth. As we already exposes couple of depth sensors as GREY, I think
your patch is ok, and should be merged. It's not really clear in
general how the driver can really figure-out what type of data is
delivered. So I'm not sure where to start.

> 
> I've found https://www.magnumdb.com/search?q=value%3A
> %2200000032-0002-0010-8000-00aa00389b71%22 and https://docs.microsoft.com/en-us/windows-hardware/drivers/stream/infrared-stream-support-in-uvc that confirm 
> this is a 8-bit IR format.
> 
> > > > *https://dustinweb.azureedge.net/media/338953/xps-13-9370.pdf
> > > > 
> > > > > [    2.341450] uvcvideo: Found UVC 1.00 device Integrated_Webcam_HD
> > > > > (0bda:58f4)
> > > > > [    2.343371] uvcvideo: Unable to create debugfs 1-2 directory.
> > > > > [    2.343420] uvcvideo 1-5:1.2: Entity type for entity Extension 10
> > > > > was
> > > > > not initialized!
> > > > > [    2.343422] uvcvideo 1-5:1.2: Entity type for entity Extension 12
> > > > > was
> > > > > not initialized!
> > > > > [    2.343423] uvcvideo 1-5:1.2: Entity type for entity Processing 9
> > > > > was
> > > > > not initialized!
> > > > > [    2.343424] uvcvideo 1-5:1.2: Entity type for entity Camera 11 was
> > > > > not initialized!
> > > > > [    2.343472] input: Integrated_Webcam_HD: Integrate as
> > > > > /devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5:1.2/input/input10
> > > > > [    2.343496] usbcore: registered new interface driver uvcvideo
> > > > > [    2.343496] USB Video Class driver (1.1.1)
> > > > > [    2.343501] initcall uvc_init+0x0/0x1000 [uvcvideo] returned 0
> > > > > after
> > > > > 5275 usecs
> > > > > ```
> > > > > 
> > > > > Please tell me, what I can do to improve the situation.
> 
>