I've tried to get the driver to work with various applications
(Skype, kopete what have you) to no avail.
Then I tried the capture.c example from the v4l page.
The captest gets an "invalid argument" error on
xioctl (fd, VIDIOC_QUERYBUF, &buf)
While digging a bit deeper into this I found the following:
===========================================================
if (-1 == xioctl (fd, VIDIOC_QUERYBUF, &buf))
{
printf("TYPE = %x MEM= %x\n",buf.type,buf.memory);
errno_exit ("VIDIOC_QUERYBUF");
}
============= produces ====================================
bash-3.1# ./a.out
Supported formats:
S920 SN9C20X I420 (YUV 4:2:0)
BA81 Bayer 8bit (BGGR)
JPEG JPEG (YUV 4:2:2)
RGB3 RGB3
BGR3 BGR3
YU12 YU12
YV12 YV12
call 3,c0445609,bfeec71c
TYPE = 1 MEM= 1
VIDIOC_QUERYBUF error 22, Invalid argument
============================================================
clearly memtype is set to 1 here, then at the module side:
(sn9c20x-v4l2.c 74% L1142)
============================================================
UDIA_DEBUG("QUERY BUFFERS %d %d TYPE=%x MEM=%x\n",
buffer->index, dev->queue.count,buffer->type,buffer->memory);
if (buffer->memory != V4L2_MEMORY_MMAP ||
buffer->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
============== gets me =====================================
[79584.679563] sn9c20x: v4l_sn9c20x_ioctl 08
[79584.679567] sn9c20x: Freeing 0 v4l2 buffers
[79584.679805] sn9c20x: Buffers Allocated 4
[79584.679807] SN9C20x USB 2.0 Webcam Driver: VIDIOC_REQBUFS count=4,
type=vid-cap, memory=mmap
[79584.679877] sn9c20x: v4l_sn9c20x_ioctl 09
[79584.679880] sn9c20x: QUERY BUFFERS 0 4 TYPE=1 MEM=0
[79584.679883] SN9C20x USB 2.0 Webcam Driver: VIDIOC_QUERYBUF error -22
[79584.681708] sn9c20x: Isoc cleanup
[79584.681712] sn9c20x: Freeing 4 v4l2 buffers
=============================================================
So somewhere inbetween the type of the memorybuffer seems to get lost.
It can't be an #include/#define issue since we're looking at absolute
numbers.
cat /dev/video0 happily produces text garbage of whatever the cam might
see :-)
==============================================================
bash-3.1# ldd a.out
linux-gate.so.1 => (0xb7f2e000)
/usr/local/lib/libv4l/v4l2convert.so (0xb7f2b000)
libc.so.6 => /lib/libc.so.6 (0xb7da2000)
libv4l2.so.0 => /usr/local/lib/libv4l2.so.0 (0xb7d99000)
/lib/ld-linux.so.2 (0xb7f2f000)
libv4lconvert.so.0 => /usr/local/lib/libv4lconvert.so.0
(0xb7d33000)
libpthread.so.0 => /lib/libpthread.so.0 (0xb7d1b000)
librt.so.1 => /lib/librt.so.1 (0xb7d11000)
libv4l is versioned 0.5.97 (same result with 0.5.8)
Any zen on this one ?
regards
-rasp
--
Woman inspires us to great things, and prevents us from achieving them.
-- Dumas
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