Hi,
Yes im doing streaming (well attempting to!!!), the streamon /
dqbuf - are those v4l 2 commands? Cos im using v4l one atm...
Thanks again.
-----Original Message-----
From: video4linux-list-admin@xxxxxxxxxx
[mailto:video4linux-list-admin@xxxxxxxxxx] On Behalf Of Andrey P.
Vasilyev
Sent: 02 August 2003 13:10
To: video4linux-list@xxxxxxxxxx
Subject: Re: Device or resource busy
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
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