i.MX Processorsのトピックi.MX6 video capture to GPU buffer https://community.nxp.com/t5/i-MX-Processors/i-MX6-video-capture-to-GPU-buffer/m-p/392369#M57276 <HTML><HEAD></HEAD><BODY><P>Is there an existing mechanism to capture video (V4L) frames directly into a buffer which can also be directly accessed (without additional copies) by OpenCL?</P><P></P><P>I have explored the use of V4L2_MEMORY_USERPTR buffers for the camera access, but this functionality does not appear to be working [dequeued buffers do not match those which were enqueued]. The example provided in <A _jive_internal="true" href="https://community.nxp.com/thread/359579">https://community.freescale.com/thread/359579</A> fails when run with the "-u" option, on <SPAN style="line-height: 1.5;"> 3.10.17-1.0.2_ga</SPAN></P></BODY></HTML> Tue, 28 Jul 2015 20:45:01 GMT markmerritt 2015-07-28T20:45:01Z i.MX6 video capture to GPU buffer https://community.nxp.com/t5/i-MX-Processors/i-MX6-video-capture-to-GPU-buffer/m-p/392369#M57276 <HTML><HEAD></HEAD><BODY><P>Is there an existing mechanism to capture video (V4L) frames directly into a buffer which can also be directly accessed (without additional copies) by OpenCL?</P><P></P><P>I have explored the use of V4L2_MEMORY_USERPTR buffers for the camera access, but this functionality does not appear to be working [dequeued buffers do not match those which were enqueued]. The example provided in <A _jive_internal="true" href="https://community.nxp.com/thread/359579">https://community.freescale.com/thread/359579</A> fails when run with the "-u" option, on <SPAN style="line-height: 1.5;"> 3.10.17-1.0.2_ga</SPAN></P></BODY></HTML> Tue, 28 Jul 2015 20:45:01 GMT https://community.nxp.com/t5/i-MX-Processors/i-MX6-video-capture-to-GPU-buffer/m-p/392369#M57276 markmerritt 2015-07-28T20:45:01Z Re: i.MX6 video capture to GPU buffer https://community.nxp.com/t5/i-MX-Processors/i-MX6-video-capture-to-GPU-buffer/m-p/392370#M57277 <HTML><HEAD></HEAD><BODY><P>Hi Mark,</P><P></P><P>Unfortunately there is no any implementation for buffer sharing between v4L and OpenCL for vivante GPU driver. Just from top of my head, I guess one implementation could be done importing the DMABUFF to OCL memory object with clCreateBuffer.</P><P></P><P>Similar approached have been implemented but in this case for GPU Frame buffer and OpenCV.</P><P></P><P><A href="http://imxcv.blogspot.com/2014/08/onboard-camera-v4l-wrapper-with-yocto.html" title="http://imxcv.blogspot.com/2014/08/onboard-camera-v4l-wrapper-with-yocto.html">Computer Vision on i.MX Processors: Onboard Camera - V4L wrapper with Yocto Project</A> </P><P></P><P>Regards</P></BODY></HTML> Thu, 30 Jul 2015 15:00:49 GMT https://community.nxp.com/t5/i-MX-Processors/i-MX6-video-capture-to-GPU-buffer/m-p/392370#M57277 Bio_TICFSL 2015-07-30T15:00:49Z