 Buffers in the Linux Kernel video API documentation

Primary source: www.kernel.org/doc/html/latest/userspace-api/media/v4l/buffer.html

Verified locator: §3.5 opening: multi-planar buffer as plane container. §3.5.2 v4l2_buffer.length is plane-array element count for the multi-planar API. §3.5.3 v4l2_plane.length is byte capacity, bytesused includes data_offset, and actual image-data size is bytesused minus data_offset.