Hello!
On Sat, Aug 02, 2003 at 01:25:37PM +0100, Matt Brocklehurst wrote:
> Hi,
> Im wanting to perform continuous capture in a loop, but after ive
> done my first batch of frame captures (capturing, waiting for sync x 4),
> and go back to the start of the loop again where i send the capture
> command i just get device or resource busy. Do i need to send another
> ioctl signal to the v4l device to say 'get ready im coming round again'
> (its a bttv card).
Does you performing streaming capture?
In that case, right sequence is like this:
- Initiate capture (perform any initializations, allocate buffers and then
ioctl (STREAMON))
- ioctl (QBUF) multiple times for all of allocated buffers
- Continuously:
- ioctl (DQBUF) to dequeue the buffer filled with frame
- Perform with this buffer any proceessing you want
- ioctl (QBUF) with this frame to allow the driver to fill it with a
new frame
--
Andrey Vasilyev
