Passing DMA buffer fd

[Nicolas Dufresne]

Le lun. 28 déc. 2020 12 h 45, Gururaj <gururajspeaks at gmail.com> a écrit :

> Hi All,
> I have created a gstreamer plugin which acts as a source element for camera
> data.
> In that plugin i have started the camera device in DMA buf mode using v4l2
> api and drm api's
> I'm able to get the data using the drmfd with the below ioctl call:
> ioctl(drmfd, DRM_IOCTL_MODE_MAP_DUMB, &arg);
>
> But i want to pass the fd to downstream elements
>
> Can someone please hekp on how can i pass this fd to downstream elements so

that they can use that fd for accessing


Have you looked at existing element, v4l2src already produce dmabuf by
default. It uses the GstDMABufAllocator to wrap the FD, this is a common
class that let downstream know the type of memory and retrieve the FD
without mapping.

 the dma buffer


> Thanks in advance
>
>
>
> --
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