On 26 Jan 2001, Gerd Knorr wrote: > (VIDIOC_S_FMT). Then ask the driver using REQBUFS for buffers, > indicating whenever you want to use your own userspace memory buffers > or mmap() the memory from the driver. For the second case you'll > have to mmap() the buffers here. The you can queue the number of > buffers VIDIOC_QBUF which you aquired using REQBUFS, start capture > with VIDIOC_STREAMON, get/requeue buffers using VIDIOC_DQBUF/VIDIOC_QBUF > until you are done, and finally call VIDIOC_STREAMOFF and REQBUFS(0). > munmap() the driver memory if needed. For a bt848, when are the risc program(s) generated? When REQBUFS is called, or when VIDIOC_QBUF is called? > Packed pixel formats can use the v4l2_pix_format.bytesperline to > specify any padding they want. Planar formats can't have padding > (any objections on this? If so: why? I can't think of any useful > application for this...). What if you want to overlay the video into a larger image, except you're using planar mode? What about clipping?
