Ronald Bultje wrote:
> Hi Brian,
>
> On Thu, 2002-08-22 at 10:17, Brian W Grasby wrote:
> > where vFrq is a struct v4l2_frequency
>
> The BTTV driver (0.8) uses an integer as argument, not a struct
> v4l2_frequency. Use the latest BTTV-0.8 from http://bytesex.org/bttv/
> and use an integer instead of the struct:
Well, there are *two* ioctls for tuning a frequency. One is
VIDIOC_S_FREQ which takes an integer and the other is VIDIOC_G_FREQUENCY
which takes struct v4l2_frequency:
bogomips kraxel ~/kernel/v4l2# grep FREQ videodev2.h
#define VIDIOC_G_FREQ _IOR ('V', 31, int)
#define VIDIOC_S_FREQ _IOWR ('V', 32, int)
#define VIDIOC_G_FREQUENCY _IOWR ('V', 56, struct v4l2_frequency)
#define VIDIOC_S_FREQUENCY _IOW ('V', 57, struct v4l2_frequency)
> integer freq = <some_number>;
> ioctl(fd, VIDIOC_S_FREQ, &freq);
That should work, yes. bttv simply doesn't support VIDIOC_G_FREQUENCY
(yet).
> You can set the input for this tuner using VIDIOC_S_TUNER.
VIDIOC_G_FREQUENCY doesn't switch inputs. It was added to handle cards
with multiple tuners correctly, and the tuners are refered by the input
they are connected to.
Gerd
--
You can't please everybody. And usually if you _try_ to please
everybody, the end result is one big mess.
-- Linus Torvalds, 2002-04-20
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