CVSROOT: /cvs
Module name: xenocara
Changes by: feine...@cvs.openbsd.org 2020/07/01 00:45:24
Modified files:
app/video : video.c
Log message:
Initialize v4l2_requestbuffers for better libv4l compatibility
The VIDIOC_REQBUFS ioctl requires a v4l2_requestbuffers struct with the members
count, type, and memory. In the past only count was set as the uvideo(4) kernel
driver, via uvideo_reqbufs(), is ignoring both struct members type and memory
(pointed out by mpi@).
However, using video(1) with libv4l
(LD_PRELOAD=/usr/local/lib/v4l2convert.so video)
yields "mmap: Invalid argument" as libv4l inspects the type and memory
struct members and fails if memory != V4L2_MEMORY_MMAP.
Full initialization fixes libv4l usage which allows us to view video encodings
not directly supported by video(1), e.g., MJPEG, as libv4l can convert
encodings on the fly.
OK mglocker@
