Hi Ladis, On Mon, 2003-09-29 at 14:01, Ladislav Michl wrote: > in short VIDIOCGCAPTURE and VIDIOCSCAPTURE ioctl using struct video_capture > should be used to set capture window while VIDIOCGWIN and VIDIOCSWIN using > struct video_window should be used to set overlay window. No, the API documentation that you're reading is wrong. The drivers are right. VIDIOC[SG]WIN are indeed for overlay. However, VIDIOC[SG]CAPTURE are for hardware **MPEG** capture, not for raw capture. Raw capture format using the streaming (mmap) interface in v4l1 is controlled by the video_mmap struct. And I know this sucks, that's why it was improved in v4l2. I'm just guessing here, but I think you should really read the v4l2 documentation and use v4l2 instead. v4l1 is old, obsolete and can't do too many things. > I'd like also to know how should continuous capture work (via mmap). Using > existing drivers as example it no longer option for me :-( Well, VIDIOCMCAPTURE, VIDIOCSYNC for queue/sync cycles, and mmap or memory mapping. Here, too, I suggest to use v4l2. It works the same (VIDIOC_QBUF and VIDIOC_DQBUF for queue/sync), but format setting is separated from the actual capture cycle, which is (imo) a lot easier to implement in drivers. Either way, the drivers are correct. You should use them as a reference if the documentation is incomplete. HTH, Ronald -- Ronald Bultje <rbultje@xxxxxxxxxxxxxxxxxxx> Linux Video/Multimedia developer
