Date: Fri, 6 Jan 2012 14:48:11 +0100 From: Matthias Apitz <guru@unixarea.de> To: Hans Petter Selasky <hselasky@c2i.net> Cc: freebsd-multimedia@freebsd.org Subject: Re: webcamd/cuse4bsd && Skype Message-ID: <20120106134811.GA6168@tinyCurrent> In-Reply-To: <201201051900.01903.hselasky@c2i.net> References: <20120101164408.GA2389@tinyCurrent> <201201051653.15808.hselasky@c2i.net> <20120105175505.GA2167@tinyCurrent> <201201051900.01903.hselasky@c2i.net>
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El día Thursday, January 05, 2012 a las 07:00:01PM +0100, Hans Petter Selasky escribió:
> > > > I checked the source tree for 'CONFIG_VIDEO_V4L1_COMPAT' but it is only
> > > > mentioned as #undef CONFIG_VIDEO_V4L1_COMPAT in build/config.h, no
> > > > further places; so I don't know where to look if some additional lib is
> > > > compiled and linked static to webcamd (ldd does not show any additional
> > > > shared lib); I'm a bit clueless; please help
> >
> > Hi,
> >
> > OK concerning HAL, but the main question is why the V4L IOCTL are not
> > translated into V4L2? where should I look? thanks
>
> They are, but probably the structure size is wrong.
Hi,
Sorry for disagreeing; webcamd goes with a V4L cmd (0x40047601) into the
routines of media_tree/drivers/media/video/v4l2-ioctl.c and tries to
find a match there; the source reads:
static int check_array_args(unsigned int cmd, void *parg, size_t *array_size,
void * __user *user_ptr, void ***kernel_ptr)
{
int ret = 0;
switch (cmd) {
case VIDIOC_QUERYBUF:
case VIDIOC_QBUF:
case VIDIOC_DQBUF: {
struct v4l2_buffer *buf = parg;
...
and I have it in GDB as:
(gdb) s
check_array_args (cmd=1074034177, parg=0xbf4f9d94,
array_size=0xbf4f9d80,
user_ptr=0xbf4f9d7c, kernel_ptr=0xbf4f9d78)
at media_tree/drivers/media/video/v4l2-ioctl.c:2202
2202 int ret = 0;
(gdb) n
2204 switch (cmd) {
(gdb)
2239 return ret;
(gdb) p ret
$8 = 0
(gdb) p /x cmd
$9 = 0x40047601
i.e. it can not find any match with cmd=0x40047601 in the defines of
/usr/local/include/linux/videodev2.h
/*
* I O C T L C O D E S F O R V I D E O D E V I C E S
*
*/
#define VIDIOC_QUERYCAP _IOR('V', 0, struct v4l2_capability)
#define VIDIOC_RESERVED _IO('V', 1)
#define VIDIOC_ENUM_FMT _IOWR('V', 2, struct v4l2_fmtdesc)
#define VIDIOC_G_FMT _IOWR('V', 4, struct v4l2_format)
#define VIDIOC_S_FMT _IOWR('V', 5, struct v4l2_format)
#define VIDIOC_REQBUFS _IOWR('V', 8, struct v4l2_requestbuffers)
...
they are all there with capital 'V' while we have 'v' (0x76) im the cmd;
this can not work; somewhere the conversion from V4L to V4L2 is missed;
where this should be done, please point me to the source file to check
and set a breakpoint there; thanks
matthias
--
Matthias Apitz
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UNIX since V7 on PDP-11 | UNIX on mainframe since ESER 1055 (IBM /370)
UNIX on x86 since SVR4.2 UnixWare 2.1.2 | FreeBSD since 2.2.5
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