webcamd/cuse4bsd && Skype

[Hans Petter Selasky]

On Friday 06 January 2012 14:48:11 Matthias Apitz wrote:
> 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
> 

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.

--HPS