code does not use libv4l for pixel format conversion

[mungewell]

As the subject suggests, you can use libv4l to act as a 'magic shim' to do the conversion from pixel formats that you don't know about. This would also mean that you don't have to do you own YUYV->RGB code.

see:
http://hansdegoede.livejournal.com/3636.html

Just need to change your ioctl calls to v4l2_ioctl.

Cheers,
mungewell.

[Fredrik Portström (portstrom)]

libv4l is now supported, and the code to convert YUYV->RGB is not used when using libv4l.

[mungewell (simon-mungewell)]

Cool... I can confirm that this works with a Logitec Notebook Pro webcam, which only outputs MJPG.
--
> ./list_devices.py
/dev/video0
    driver: uvcvideo
    card: UVC Camera (046d:08c3)
    bus info: 0000:00:1d.1

> ./capture_picture.py
Saved image.jpg (Size: 864 x 480)
--

Strangely the other system I used only captured at:
 320x240
 640x480

Cheers,
Mungewell.

[mungewell (simon-mungewell)]

Just a quick note that it doesn't gracefully warn if 'libv4l-dev' is not installed.
--
simon@myth:~/python-v4l2-capture$ ./setup.py build
running build
running build_ext
building 'v4l2capture' extension
gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fPIC -I/usr/include/python2.5 -c v4l2capture.c -o build/temp.linux-i686-2.5/v4l2capture.o
v4l2capture.c:19:21: error: libv4l2.h: No such file or directory
v4l2capture.c: In function ‘my_ioctl’:
v4l2capture.c:55: warning: implicit declaration of function ‘v4l2_ioctl’
v4l2capture.c: In function ‘Video_device_unmap’:
v4l2capture.c:76: warning: implicit declaration of function ‘v4l2_munmap’
v4l2capture.c: In function ‘Video_device_dealloc’:
v4l2capture.c:89: warning: implicit declaration of function ‘v4l2_close’
v4l2capture.c: In function ‘Video_device_init’:
v4l2capture.c:105: warning: implicit declaration of function ‘v4l2_open’
v4l2capture.c: In function ‘Video_device_create_buffers’:
v4l2capture.c:267: warning: implicit declaration of function ‘v4l2_mmap’
v4l2capture.c:268: warning: assignment makes pointer from integer without a cast
error: command 'gcc' failed with exit status 1
--

Cheers,
Mungewell.