[FFmpeg-devel] [Ffmpeg-devel] [PATCH] video grab support VIDEO_PALETTE_RGB565

Michael Niedermayer michaelni
Wed May 9 00:42:30 CEST 2007


On Tue, May 08, 2007 at 04:50:42PM +0800, yi li wrote:
> Hi,
> Made more changes accordingly.  (And sorry for my late response due to
> holiday).
> >this would be more readable if things where vertically aligned like:
> >{.palette = VIDEO_PALETTE_RGB565, .depth = 16, .pix_fmt = PIX_FMT_BGR565},
> >{.palette = VIDEO_PALETTE_GREY  , .depth =  8, .pix_fmt = PIX_FMT_GRAY8}
> >also i think the .palette, .depth, ... hurts readability more than it
> helps
> I copy the name from v4l header "linux/videodev.h" "struct video_picture"
> definition, and would like to keep them compatible.

what i meant was


is more readable IMHO, but this is not a big issue, if you prefer iam fine
with leaving it with the .palette, .depth, .pix_fmt

> >>+            if (-1 != ioctl(video_fd, VIDIOCSPICT, &pict))
> >>+                break;
> >i think this should rather stay <0 instead of ==-1
> I made change in the new patch since I saw the similar "<0" usage in grab.c.
> However, "ioctl" mannual states that: "Upon successful completion, ioctl()
> shall return a value other than -1 that depends upon the STREAMS device
> control function. Otherwise, it shall return -1 and set errno to indicate
> the error."

what ioctl manual?
man ioctl says:
    Usually, on success zero is returned.  A few ioctl() requests use the
    return value as an output parameter and return a nonnegative  value  on
    success.   On error, -1 is returned, and errno is set appropriately.

which would mean that both ==-1 and <0 should work ...


> +    

trailing whitespace

Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

No great genius has ever existed without some touch of madness. -- Aristotle
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