Date: Fri, 6 Jan 2012 16:47:46 +0100 From: Hans Petter Selasky <hselasky@c2i.net> To: Matthias Apitz <guru@unixarea.de> Cc: freebsd-multimedia@freebsd.org Subject: Re: webcamd/cuse4bsd && Skype Message-ID: <201201061647.46539.hselasky@c2i.net> In-Reply-To: <20120106134811.GA6168@tinyCurrent> References: <20120101164408.GA2389@tinyCurrent> <201201051900.01903.hselasky@c2i.net> <20120106134811.GA6168@tinyCurrent>
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On Friday 06 January 2012 14:48:11 Matthias Apitz wrote:
> El d=EDa Thursday, January 05, 2012 a las 07:00:01PM +0100, Hans Petter=20
Selasky escribi=F3:
> > > > > 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
> > >=20
> > > Hi,
> > >=20
> > > OK concerning HAL, but the main question is why the V4L IOCTL are not
> > > translated into V4L2? where should I look? thanks
> >=20
> > They are, but probably the structure size is wrong.
>=20
> Hi,
>=20
> 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:
>=20
> static int check_array_args(unsigned int cmd, void *parg, size_t
> *array_size, void * __user *user_ptr, void ***kernel_ptr) {
> int ret =3D 0;
>=20
> switch (cmd) {
> case VIDIOC_QUERYBUF:
> case VIDIOC_QBUF:
> case VIDIOC_DQBUF: {
> struct v4l2_buffer *buf =3D parg;
> ...
>=20
> and I have it in GDB as:
>=20
> (gdb) s
> check_array_args (cmd=3D1074034177, parg=3D0xbf4f9d94,
> array_size=3D0xbf4f9d80,
> user_ptr=3D0xbf4f9d7c, kernel_ptr=3D0xbf4f9d78)
> at media_tree/drivers/media/video/v4l2-ioctl.c:2202
> 2202 int ret =3D 0;
> (gdb) n
> 2204 switch (cmd) {
> (gdb)
> 2239 return ret;
> (gdb) p ret
> $8 =3D 0
> (gdb) p /x cmd
> $9 =3D 0x40047601
>=20
> i.e. it can not find any match with cmd=3D0x40047601 in the defines of
>=20
> /usr/local/include/linux/videodev2.h
>=20
> /*
> * 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)
> ...
>=20
> 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
>=20
Hi,
Could you try with the latest 3.2 port of webcamd which I posted?
BTW: I'm busy all weekend. Will reply on Monday.
=2D-HPS
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