[GEM-dev] uvc webcam (eee pc 900 built in) with pix_video?

[ben at ekran.org]

Thanks Cyrille.

I got a fresh checkout from svn thinking maybe some configure issue was
there. Very interestingly I am getting different pix_video outputs on
instantiation:

video driver 0: video4linux

no videot4linux2

This is after doing this on a fresh co:

aclocal && autoconf && ./configure --prefix=/usr && make

I'm confused...

Ah, well configure tells me whats up:

checking for PKG_LIBV4L1_CFLAGS...
checking for PKG_LIBV4L1_LIBS...
checking for libv4l1-config... no
checking for v4l1_open in -llibv4l1... no
checking for PKG_LIBV4L2_CFLAGS...
checking for PKG_LIBV4L2_LIBS...
checking for libv4l2-config... no
checking for v4l2_open in -llibv4l2... no

hmmm...

apt-get install --reinstall libv4l-0

does not make a difference.

seems gcc agrees:

gcc -llibv4l2
/usr/bin/ld: cannot find -llibv4l2

ummmm..

file /usr/lib/libv4l2.so.0
/usr/lib/libv4l2.so.0: ELF 32-bit LSB shared object, Intel 80386, version
1 (SYSV), dynamically linked, stripped

I'm lost... but seems like little to do with Gem. I'll look into v4l
issues on intrepid.

Thanks all for trying.

.b.

> hello Ben,
>
> i don't have a eee, but i do have exactely the same camera on my laptop.
>
> my ./configure output somthing like this :
>     use v4l              : yes (libv4l)
>
> using ubuntu 8.10 (intrepid) and the same version than your of libv4l.
>
> when creating a pix_video object, i've got in the pd log :
> video driver 0: video4linux2
> video driver 1: video4linux
> video driver 2: ieee1394 for linux
>
> pix_video help patch is working out of the box.
>
> i can't understand why it's not working for you.
>
> Cyrille
>
> ben at ekran.org a écrit :
>> Thanks Johannes.
>>
>> I tried a straight:
>>
>> svn update && svn revert . && aclocal && autoconf && ./configure && make
>>
>> same issue.
>>
>> I've attached the webcam lsusb -v info, maybe the 901 has a different
>> camera?
>>
>> I'm linking with libv4l-0 0.5.7-1~intrepid1
>>
>> Let me know if you have any ideas, otherwise I'll leave this off the
>> demo
>> list.
>>
>> Thanks all.
>> .b.
>>
>>> Ivica Ico Bukvic wrote:
>>>
>>>> Gem. IIRC when I was inquiring about this the last time I think the
>>>> reply
>>>> was that currently v4l2 is not supported well under Gem (although
>>>> please
>>>> take this with a boulder of salt as this has been a while ago).
>>>
>>> this has changed with the advent of libv4l (which is now in debian)
>>>
>>> at least here on my eepc 901 the camera works out of the box with Gem
>>> (no special configure tweaks needed)
>>>
>>>
>>>>> I'm working with an svn copy of GEM updated yesterday. I'm
>>>>> configuring
>>>>> with:
>>>>>
>>>>> ./configure --prefix=/usr --without-libv4l1
>>>>> --with-libv4l2-libs=/usr/lib/
>>>>> --with-libv4l2-includes=/usr/include/
>>> see above: no special switches should be needed (if libv4l is
>>> installed)
>>>
>>>>> and GEM complains about the camera when I start pix_video (and I get
>>>>> no
>>>>> video image):
>>>>>
>>>>> v4l: VDIOCGCHAN: Invalid argument
>>>>>
>>>>> This device/camera must only have one channel?
>>> yes, but how is Gem supposed to know?
>>> anyhow, it shouldn't really matter, as the driver will either ignore
>>> the
>>>   channel-change request or you could set it to "channel 0".
>>>
>>>>> I can't tell if I'm using v4l1 or 2. configure tells me v4l: yes not
>>>>> matter if its v4l1 or v4l2 I enable. I also have a vague memory that
>>>>> configure should tell me what v4l its using, like:
>>>>>
>>>>> v4l: yes (libv4l2)
>>> your memory might be correct, but the world moves on and
>>> configure-scripts get updated.
>>>
>>> i'll check back on my eee which version of libv4l i'm using.
>>>
>>> fgamsdr
>>> IOhannes
>>>
>>>
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