Ekiga && PTlib: pwc.ko ./. webcamd

Matthias Apitz guru at unixarea.de
Thu May 26 14:01:45 UTC 2011

Hello Hans,

I've ported PTlib, Opal and Ekiga from SVN and Git to FreeBSD HEAD
(r220692, ~mid of April); the webcamd(8) is from ports from the same day;

in PTlib is support for V4L (plugin vidinput_v4l.cxx, attached) which
works fine in Ekiga when I use the kernel mod pwc.ko (from the ports as

it crashes Ekiga when webcamd(8) and its pwc.ko is used while opening
the webcam:

2011/05/23 16:26:18.817   0:11.012 PVideoInputDevice_V4L: trying to open Philips SPC 900NC webcam

gdb backtrace:

(gdb) bt
#0  0x2a57dcda in memcpy () from /lib/libc.so.7
#1  0x2b8a504c in PVideoInputDevice_V4L::GetFrameDataNoDelay () from /usr/local/lib/ptlib-2.10.1/devices/videoinput/v4l_pwplugin.so
#2  0x2b8a50c9 in PVideoInputDevice_V4L::GetFrameData () from /usr/local/lib/ptlib-2.10.1/devices/videoinput/v4l_pwplugin.so
#3  0x285935b1 in GMVideoInputManager_ptlib::get_frame_data (this=0x2b5d5470, data=0x2b604000 '¥' <repeats 200 times>...)
    at ../lib/engine/components/ptlib/videoinput-manager-ptlib.cpp:190
#4  0x28523a87 in Ekiga::VideoInputCore::get_frame_data (this=0x2aeda200, data=0x2b604000 '¥' <repeats 200 times>...)
    at ../lib/engine/videoinput/videoinput-core.cpp:381
#5  0x285241fe in Ekiga::VideoInputCore::VideoPreviewManager::Main (this=0x2aeda318)
    at ../lib/engine/videoinput/videoinput-core.cpp:110
#6  0x294b473e in PThread::PX_ThreadStart () from /usr/local/lib/libpt.so.2.10-beta1
#7  0x2a46846a in pthread_getprio () from /lib/libthr.so.3
#8  0x00000000 in ?? ()

Before debugging further this, can you imagine why this works with
pwc.ko and not with webcamd(8)?


Matthias Apitz
t +49-89-61308 351 - f +49-89-61308 399 - m +49-170-4527211
e <guru at unixarea.de> - w http://www.unixarea.de/

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