On Sat, Oct 24, 2015 at 11:38 AM, Hans Verkuil <hverkuil@xxxxxxxxx> wrote: > > > On 10/23/2015 23:57, Ran Shalit wrote: >> On Tue, Oct 20, 2015 at 9:23 AM, Hans Verkuil <hverkuil@xxxxxxxxx> wrote: >>> On 10/19/2015 10:26 PM, Ran Shalit wrote: >>>> Hello, >>>> >>>> When writing a device driver for capturing video coming from PCIe, >>>> does it need to be used as v4l device (video for linux) , ? >>> >>> Yes. If you don't then 1) you will never be able to upstream the driver, >>> 2) any application that wants to use your driver will need custom code to >>> talk to your driver, 3) it will be a lot more work to write the driver >>> since you can't use the V4L2 kernel frameworks it provides or ask for >>> help. >>> >>> Basically, by deciding to reinvent the wheel you're screwing over your >>> customers and yourself. >>> >>> Here is a nice PCI(e) template driver that you can use as your starting >>> point: Documentation/video4linux/v4l2-pci-skeleton.c >>> >>> Regards, >>> >>> Hans >> >> Hi Hans, >> >> I now understand, that I will be using media sdk (Intel) which is >> based on DRM framework, and does not use v4l. > > DRM is for video output, not video capture. So this seems irrelevant. > >> So I probably need to do some custom driver for delivering video with PCIe. > > There is only one linux API for video capture: V4L2. What PCIe card are we > talking about here? What are you trying to achieve? > I need to capture video from PCIe . The video stream will be delivered from PC through PCIe to a custom board with Intel cpu using media sdk. The purpose is to encode the raw video and save the encoded stream to a file. I guess I can build some custom driver which waits for frames and deliver the received frames to the media sdk encoder. Since media sdk does not use v4l anyway, so I guess such custom driver is the best under this conditions, Right ? Regards, Ran -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
