Hi,
no, not really. I have an embedded system with an ARM9 and DSP CPU. The
DSP encodes the video with h264. So, I have to send the frames to the
DSP with a specific shared memory section (shared memory is outside the
linux memory).
Currently, I have to copy each frame from the requested v4l2 buffers to
this shared memory. But I would like to pass a pointer to the shared
memory directly to the uvc driver (USERPTR streaming).
Cheers,
Andreas
Adrian Sergiu Darabant schrieb:
Andreas,
Would this be for using X shared memory segments with the uvcdriver ?
Adrian
----- Original Message ----
From: Andreas Auer <a.a...@zydacron.com>
To: linux-uvc-de...@lists.berlios.dea
Sent: Fri, 28 May, 2010 12:08:19
Subject: [Linux-uvc-devel] UVC userpointer streaming (memory mapping)
Hi,
I'm trying to get user pointer streaming with UVC webcams working. I already
got a patch from Laurent Pinchart (thanks) which enables user pointer
streaming. This patch works if I pass malloc()'d memory to the driver.
My problem is that I want to use mmap()'d memory (via /dev/mem) and this type
of memory (flags VM_IO and VM_PFNMAP are set) is not supported to be used with
get_user_pages to map the memory to the kernel space.
So, is there another way to map the pages into the kernel space to be used for
user pointer streaming?? I had a look at kmap (kmap_atomic)... would this be
possible??
Thanks,
Andreas
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