Hi Laurent, On 01/09/2017 05:59 PM, Laurent Pinchart wrote: > Hi Vincent, > > (CC'ing Nicolas) > > On Monday 09 Jan 2017 15:49:00 Vincent ABRIOU wrote: >> On 01/09/2017 04:37 PM, Laurent Pinchart wrote: >>> Hi Vincent, >>> >>> Thank you for the patch. >>> >>> On Monday 03 Oct 2016 13:27:16 Vincent Abriou wrote: >>>> Allow uvcvideo compatible devices to allocate their output buffers using >>>> contiguous DMA buffers. >>> >>> Why do you need this ? If it's for buffer sharing with a device that >>> requires dma-contig, can't you allocate the buffers on the other device >>> and import them on the UVC side ? >> >> Hi Laurent, >> >> I need this using Gstreamer simple pipeline to connect an usb webcam >> (v4l2src) with a display (waylandsink) activating the zero copy path. >> >> The waylandsink plugin does not have any contiguous memory pool to >> allocate contiguous buffer. So it is up to the upstream element, here >> v4l2src, to provide such contiguous buffers. > > Isn't that a gstreamer issue ? > It is not a gstreamer issue. It is the way it has been decided to work. Waylandsink accept DMABUF contiguous buffer but it does not have its own buffer pool. Vincent >>>> Add the "allocators" module parameter option to let uvcvideo use the >>>> dma-contig instead of vmalloc. >>>> >>>> Signed-off-by: Vincent Abriou <vincent.abriou@xxxxxx> >>>> --- >>>> >>>> Documentation/media/v4l-drivers/uvcvideo.rst | 12 ++++++++++++ >>>> drivers/media/usb/uvc/Kconfig | 2 ++ >>>> drivers/media/usb/uvc/uvc_driver.c | 3 ++- >>>> drivers/media/usb/uvc/uvc_queue.c | 23 ++++++++++++++++++--- >>>> drivers/media/usb/uvc/uvcvideo.h | 4 ++-- >>>> 5 files changed, 38 insertions(+), 6 deletions(-) >-- 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
