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https://community.nxp.com/thread/336875
Dec 11, 2014 · However, looking in mxc_v4l2_capture.c, VIDIOC_QUERYBUF calls mxc_v4l2_prepare_bufs() - but, it seems that paddress is copied from the v4l2_buffer provided by the user. My question -- Are user-space buffers (V4L2_MEMORY_USERPTR) supported in iMX6 Linux?Reviews: 4
https://www.kernel.org/doc/html/v4.10/media/uapi/v4l/buffer.html
When the memory type in the containing struct v4l2_buffer is V4L2_MEMORY_MMAP, this is the value that should be passed to mmap(), similar to the offset field in struct v4l2_buffer. unsigned long: userptr: When the memory type in the containing struct v4l2_buffer is V4L2_MEMORY_USERPTR, this is a userspace pointer to the memory allocated for ...
https://www.kernel.org/doc/html/v5.3/media/uapi/v4l/vidioc-reqbufs.html
memory: Applications set this field to V4L2_MEMORY_MMAP, V4L2_MEMORY_DMABUF or V4L2_MEMORY_USERPTR. See v4l2_memory. __u32: capabilities: Set by the driver. If 0, then the driver doesn't support capabilities. In that case all you know is that the driver is guaranteed to support V4L2_MEMORY_MMAP and might support other v4l2_memory types. It will ...
https://e2e.ti.com/support/processors/f/791/t/682174?Linux-DRA745-v4l2-userptr-access
our bsp is based on 6AM.1.2. I make a test using type V4L2_MEMORY_USERPTR to communicate with v4l2-core. unfortunately, test failed. "contiguous mapping is too small" print in kernel log ...
https://stackoverflow.com/questions/59723314/vidioc-qbuf-device-or-resource-busy-v4l2-memory-userptr
All of the following are using the #include <linux/videodev2.h> #include <vector> Basically I have to stream from my camera computer. The idea is that I have to make 5 frames which ...
https://community.nxp.com/thread/359579
Apr 19, 2016 · Moreover, the purpose of USERPTR in V4L2 is to allow users to pass buffers allocated in user-space directly by malloc or statically. Using PXP or IPU ot perform the allocation is not really the way it was intended.Reviews: 10
https://devtalk.nvidia.com/default/topic/1047425/jetson-tx2/switching-v4l2_memory_userptr-after-each-frame-visual-artifact/
Mar 04, 2019 · Using the latest Jetpack 3.3, we see an odd artifact. When switching the V4L2Buffer buf.m.userptr after the frame has been dequeued, the screen flickers when the buffer is …
https://github.com/yangh/uvcvideo/blob/master/v4l2-capture/capture.c
uvcvideo driver with still image capture support. Contribute to yangh/uvcvideo development by creating an account on GitHub.
https://devtalk.nvidia.com/default/topic/894783/v4l2_memory_userptr-not-working-with-soc-camera-/
Jul 06, 2016 · we have developed soc camera based driver for ov sensor. we are using standard v4l2 application to capture image from sensor. we are able to test using mmap method but not using user pointer method (V4L2_MEMORY_USERPTR) method.
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